法国专利FR3049357A1 REAR LIGHTING UNIT AND HIGH HEAD DISPLAY DEVICE

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专利摘要:
A rear lighting unit includes a light source; a condensing unit that condenses light that is emitted from the light source; and a divergence unit which diverts light that enters from the condensing unit and emits light to a light transmission type image display unit in a head-up display device. For example, the unit of divergence is a lens / lens whose two surfaces are an incident surface in which light from the condensing unit enters as well as a transmitting surface from which the light is emitted in the direction of the image display unit, are concave surfaces.
公开号:FR3049357A1
申请号:FR1752357
申请日:2017-03-22
公开日:2017-09-29
发明作者:Jun Shihaku；Kenji Koizumi；Naohisa Murata；Noriaki Narushima；Kazuki Kubota
申请人:Yazaki Corp；
IPC主号:

专利说明:

REAR LIGHTING UNIT AND HEAD DISPLAY DEVICE
HIGH
BACKGROUND OF THE INVENTION 1. Field of the Invention
The present invention relates to a backlight or backlight unit and a head-up display device. 2. Description of the Prior Art
A head-up display device that includes a backlight or backlight is known to be conventional. For example, published Japanese Patent Application No. 2007-108429 discloses a display device technology that includes a display portion that displays desired information because it is transmissively illuminated / a source. light disposed at the rear of the display portion and transmissively illuminating the display portion; a diffusion plate which uniformizes the light emitted from the light source / and a first objective / a first condensing lens which condenses the light made uniform by the diffusion plate on the display part and which transmissively illuminates the display part. It is disclosed that the display which is disclosed in published Japanese Patent Application No. 2007-108429 reduces the luminance irregularity of the illuminating light transmitted by the diffusion plate while preventing a reduction of the luminance at the level of the illumination light transmitted by the first objective / the first condensing lens.
It is possible to improve the luminance of an image by concentrating the projection light over a certain range, by condensing light from a light source using a lens / condenser lens. Furthermore, when a point of sight / point of eye is changed due to a change in posture of the driver or the like, the luminance of an image to be displayed can be changed.
SUMMARY OF THE INVENTION The object of the present invention is to provide a rear lighting unit and a head-up display device which make it possible to prevent the modification / variation of the luminance in an image due to a modification. at a glance.
In order to achieve the above-mentioned object, a rear lighting unit according to one aspect of the present invention includes a light source; a condensation unit which is configured to condense the light emitted from the light source / and a divergence unit which is configured to diverge light which enters from the condensing unit and thereby transmitting to a light transmission type image display unit in a head-up display device.
According to another aspect of the present invention, in the rear lighting unit, it is preferable that the divergence unit is a lens / lens at which at least one surface from an incident surface wherein light from the condensing unit enters and an emission surface from which light is emitted toward the image display unit is a concave surface.
According to yet another aspect of the present invention, in the rear lighting unit, it is preferable that the divergence unit is a lens / lens at which both surfaces are an incident surface. wherein the light from the condensing unit as well as a transmitting surface from which light is emitted towards the image display unit are concave surfaces.
According to still another aspect of the present invention, in the rear lighting unit, it is preferable that the divergence unit causes the light to diverge at least in a direction corresponding to a vehicle width direction in the unit. image display.
According to yet another aspect of the present invention, in the rear lighting unit, it is preferable that the divergence unit causes the light to diverge in a lateral direction which is a direction corresponding to a vehicle width direction, and in a longitudinal direction which is a direction corresponding to a vehicle height direction, in the image display unit; and that a degree of divergence of the light which is subject to divergence by the unity of divergence in the lateral direction is greater than a degree of divergence of the light which is subject to divergence by the unit of divergence in the longitudinal direction.
In yet another aspect of the present invention, a head-up display device includes a light transmission type image display unit that is configured to display an image; a source of light; a condensing unit that is configured to condense the light that is emitted from the light source; and a divergence unit that is configured to diverge light that enters from the condensing unit and transmit it to the image display unit, in which the image is projected. on a light reflection unit at the front of a driver's seat with the light that is emitted from the divergence unit.
The above-mentioned objects, features and advantages as well as other objects, features and advantages, as well as the technical and industrial signifiers of the present invention will be better understood after reading the detailed description which follows of presently preferred embodiments of the invention to be considered in connection with the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
The Eig. 1 is a perspective view of a head-up display device according to an embodiment of the invention. 2 is a perspective view showing the inside of the head-up display device according to the embodiment; the Eig. 3 is a plan view of a projection light emitting unit according to the embodiment; the Eig. 4 is an exploded perspective view of the projection light emitting unit according to the embodiment; FIG. 5 is a perspective view of a light source unit according to the embodiment; FIG. 6 is a perspective view of a support member according to the embodiment; FIG. 7 is a perspective view of a condensing lens according to the embodiment; FIG. 8 is a perspective view of a rear surface side of a divergence lens according to the embodiment; FIG. 9 is a perspective view of a front surface side of a divergence lens according to the embodiment; FIG. 10 is a longitudinal sectional view of the projection light emitting unit according to the embodiment; FIG. 11 is a side sectional view of the projection light emitting unit according to the embodiment; FIG. 12 is a longitudinal sectional view for explaining an operation performed by a rear lighting unit according to the embodiment; FIG. 13 is a side sectional view for explaining an operation performed by the rear lighting unit according to the embodiment; FIG. 14 is a graph illustrating a luminance distribution in accordance with the head-up display device of the embodiment; and FIG. 15 is a graph that illustrates a luminance distribution of a comparative example.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
Hereinafter, a rear lighting unit and a head-up display device according to one embodiment of the present invention will be described in detail with reference to the accompanying drawings. It should be understood that the present invention is not limited to the embodiment. In addition, the components of the following embodiment include components that can be easily imagined / designed by the art, as well as components that are substantially the same as existing components.
Mode of realization
An embodiment will now be described with reference to Fiq. 1 to Fiq. 15. The present embodiment relates to a rear lighting unit and a head-up display device. The Fiq. 1 is a perspective view of a head-up display device according to the embodiment. The Fiq. 2 is a perspective view showing the inside of the head-up display device according to the embodiment. Fig. 3 is a plan view of a projection light emitting unit according to the embodiment. Fig. 4 is an exploded perspective view of the projection light emitting unit according to the embodiment. Fig. 5 is a perspective view of a light source unit according to the embodiment. Fig. 6 is a perspective view of a support member according to the embodiment. Fig. 7 is a perspective view of a condensing lens according to the embodiment. Fig. 8 is a perspective view of a rear surface side of a divergence lens according to the embodiment. Fig. 9 is a perspective view of a front surface side of a divergence lens according to the embodiment. Fig. 10 is a sectional view taken along a line X-X of FIG. 3, and a longitudinal sectional view of the projection light emitting unit according to the embodiment. Fig. 11 is a sectional view taken along line XI-XI of FIG. 3, and a side sectional view of the projection light emitting unit according to the embodiment.
A head-up display device 1 (hereinafter simply called "HUD 1") according to the present embodiment is intended to be mounted on a vehicle, which vehicle is not shown. The HUD 1 projects a projection light towards a light reflecting unit 8 (see Fig. 12) in front of a driver's seat of the vehicle. For example, the light reflection unit 8 is a semi-transmission unit that reflects a portion of the incident light and transmits a portion of the incident light, such as a windshield and a combiner. The HUD 1 is housed inside a dashboard of the vehicle. The HUD 1 includes a transmission unit which is formed at a position in which it faces the light reflection unit 8, and the HUD 1 projects a projection light towards the light reflection unit 8 via the transmission unit.
As shown in FIG. 1 and in FIG. 2, the HUD 1 includes a housing 2, a cover 3, a projection light emitting unit 4, a reflection element 5, a support member 6 and a plane mirror 9. The housing 2 is intended to be fixed on the vehicle. The casing 2 houses within it the projection light emission unit 4, the reflection element 5, the support element 6, a rotation power generating mechanism 7 and the plane mirror 9. The casing 2 is formed of a synthetic resin and includes an opening 2a which faces the upper side of the vehicle. The casing 2 includes a fixing unit 22. The fixing unit 22 is fixed to the instrument panel and the like of the vehicle, using a fastening element such as a bolt.
The cover 3 closes the opening 2a of the housing 2. The cover 3 is a similar element to a cover and it includes a main body unit 31 and a transmission unit 32. The main body unit 31 is formed of a resin synthetic. The main body unit 31 is engaged with the housing 2 by means of an engagement mechanism 33. The transmission unit 32 is formed of a transparent or semi-transparent synthetic resin, it is inserted inside the the opening of the main body unit 31 and is fixed inside thereof. The transmission unit 32 transmits the projection light which is projected from inside the housing 2 towards the light reflection unit 8 such as a windshield. The light reflection unit 8 reflects the projection light towards the driver and displays a virtual image at the front of the driver.
As shown in FIG. 2, the plane mirror 9 of the present embodiment is disposed on the bottom / bottom surface of the housing 2. The plane mirror 9 includes a mirror main body 91 and a mirror cover unit 92. A reflection surface 91a of the mirror Mirror main body 91 is a flat surface and it totally reflects the light that comes from the projection light emitting unit 4. Mirror cover unit 92 overlies a portion of reflection surface 91a. The mirror cover unit 92 exposes a region in which the light from the projection light emitting unit 4 enters therebetween and covers the outside of the region within which the light coming from the projection light emitting unit 4 enters into reflection surface 91a. In other words, the mirror cover unit 92 causes the shape of the exposed portion of the reflection surface 91a to be a shape that corresponds to the shape of the projection light that is emitted from the unit. The reflection element 5 reflects the projection light that is emitted from the projection light emission unit 4 towards the outside of the casing 2. The reflection element 5 is arranged on a passage / optical path of the projection light which is reflected by the plane mirror 9. The reflection element 5 is formed of a synthetic resin and a reflection surface 51 is provided on one of the surfaces. For example, the reflection surface 51 is a thin metal film that is formed by vapor deposition. The reflection surface 51 is a concave surface and it totally reflects the projection light that comes from the projection light emission unit 4. The support member 6 rotatably supports the reflection element 5. For example, the support member 6 is a bearing which rotatably supports both ends of an axis of rotation 53 of the reflection element 5. A line of rotation axis 01 which is shown in FIG. 2 along alternately long alternating broken line is the central axis line of the axis of rotation 53. The support member 6 rotationally supports the reflection element 5 in both directions around the line rotation axis 01, in other words in a direction RI as well as in a direction R2.
The rotational power generating mechanism 7 rotates the reflection element 5 and keeps the reflection element 5 in an optional rotational position. As shown in FIG. 2, the rotational power generating mechanism 7 includes a drive source 71 and a drive power transmission mechanism 72. The drive source 71 of the present embodiment is a motor. The drive power transmission mechanism 72 transfers the driving power from the drive source 71 to the axis of rotation 53. The projection light emission unit 4 projects an image containing information about a vehicle movement status, information for guiding a vehicle to a destination, outdoor environment information and the like. As shown in FIG. 2, a heat / heat radiating element 14 is fitted on the rear surface of the projection light emitting unit 4. The projection light emitting unit 4 is arranged in an inclined manner such that so that the projection light emitting unit 4 can project the projection light towards the plane mirror 9. As shown in FIG. 3 and in FIG. 4, the projection light emitting unit 4 includes an image display unit 10, a rear lighting unit 40, a shielding / shielding housing 12, a heat / heat transfer sheet 13 and the heat radiating element 14. The image display unit 10 displays an image intended to be projected on the light reflection unit 8, in other words, an image intended to be displayed on the screen. 'front of the driver as virtual dream. The image display unit 10 of the present embodiment is a light transmission type display part through which light is transmitted from the back surface side to the front surface side. According to the present embodiment, a thin film transistor (TFT) liquid crystal display portion is used as a light transmission type display part. The image display unit 10 includes a liquid crystal unit 11. The liquid crystal unit 11 is a light transmitting type display film which displays an image and through which light can be transmitted from the back surface side to the front surface side. The backlight unit 40 includes a first diffusion sheet 41, a housing 42, a divergence lens 43, a second diffusion sheet 44, a condensation objective 45, a support member 46 and a source unit. 47. In the rear lighting unit 40 of the present embodiment, the support member 46, the condensation lens 45, the second diffusion sheet 44, the divergence lens 43 and the first sheet of 41 are arranged in this order from the light source unit 47 towards the image display unit 10. The light source unit 47 is a light source substrate, and as shown in FIG. 5, this substrate includes a substrate main body 47a and a plurality of light sources 47b. The main substrate body 47a of the present embodiment has a rectangular shape. The light sources 47b are disposed on the front surface of the main substrate body 47a. Each of the light sources 47b is a light emitting element, and for example a light emitting diode (LED). For example, in the light source unit 47, the light sources 47b are arranged in a plurality of rows. In the light source unit 47 of the present embodiment, ten of the light sources 47b are arranged in two rows of five light sources of the light sources 47b. More specifically, a single group of light sources 47c includes five light sources of the light sources 47b which are arranged in a lateral direction. Two of the light source groups 47c are arranged in parallel in a longitudinal direction, an interval separating them. In the projection light emitting unit 4, the lateral direction and the longitudinal direction correspond, respectively, to the horizontal direction and the vertical direction of a virtual image which is intended to be displayed at the front of the driver. In other words, the lateral direction and the longitudinal direction of the projection light emitting unit 4 are directions which correspond, respectively, to a vehicle width direction and a vehicle height direction. . The main substrate body 47a includes a control circuit, which is not shown. The control circuit activates and cuts the light sources 47b and controls the amount of light of the light sources 47b. The support member 46 is an element that supports the condensation objective 45 and the second diffusion sheet 44. As shown in FIG. 6, the support member 46 includes a main body unit 46a having a plate shape, columnar shaped protuberances 46b, 46c and 46d, as well as a through hole 46e. According to a plan view, the main body unit 46a is a structural unit that has a rectangular plate shape. The columnar-shaped protuberances 46b, 46c and 46d are protuberances which are formed in a columnar shape and protrude from the main body unit 46a towards the front surface side. The columnar shaped protuberances 46b, 46c and 46d of the present embodiment each have a cylindrical shape. The through hole 46e penetrates through the main body unit 46a in a plate thickness direction. The through hole 46e is provided at a position corresponding to each of the light sources 47b of the light source unit 47. In the support member 46 of the present embodiment, ten through holes of the through holes 46e are arranged in two rows of five through holes 46th through holes. Each of the through holes 46e is formed in a flared-flank shape whose cross-sectional area is reduced toward the rear surface side from the front surface side. The cross-sectional shape of the through hole 46e of the present embodiment is rectangular, such as square.
As shown in FIG. 7, the condensing lens 45 includes a main body unit 45a which has a plate shape and a plurality of lenses 45b. The main body unit 45a and the lenses 45b are integrally formed of a synthetic resin. Each of the lenses 45b is a convex lens that protrudes toward the front surface side from the front surface of the main body unit 45a. The rear surface of the lens 45b is a flat surface. The lenses 45b correspond to the light sources 47b of the light source unit 47. For example, each of the lenses 45b is disposed on the same axis as that of each of the light sources 47b. In the condensation objective 45 of the present embodiment, ten lenses of the lenses 45b are arranged in two rows of five lenses of the lenses 45b.
Each of the lenses 45b condenses the light that is emitted from the corresponding light source 47b and generates a parallel light. In other words, the divergent light that is emitted from the light source 47b enters the condensation lens 45 from its rear surface side, and is emitted from the front surface side of the corresponding lens 45b as than parallel light. The main body unit 45a includes a through hole 45c. The through hole 45c is disposed at both ends in the lateral direction. Two through holes through holes 45c are provided with a lens array 45d which is formed by the lenses 45b located between.
As shown in FIG. 8 and in FIG. 9, the divergence objective 43 is a prism-shaped objective. The divergence lens 43 includes an incident surface 43a, a transmission surface 43b, and a border / flank unit 43e. The flank unit 43e protrudes from the prism-shaped objective main body in a direction orthogonal to an optical axis C1. The flank unit 43c includes a through-hole 43c and a notch 43d. The bearing surface 43a shown in FIG. 8 is a surface in which the light coming from the light source unit 47 enters, and this is the rear surface of the divergence lens 43. The divergence lens 43 is disposed at the front of the lens array 45d so that the optical axis C1 of the divergence lens 43 is parallel to the optical axis of the light source 47b. The emission surface 43b shown in FIG. 9 is a surface from which light is emitted in the direction of the image display unit 10, and this is the front surface of the divergence lens 43.
The incident surface 43a and the emission surface 43b of the divergence lens 43 are both concave surfaces. In other words, as shown in FIG. 8, the incident surface 43a of the divergence lens 43 is curved such that the central portion is relatively positioned at the front surface side in comparison with the outer peripheral portion. More specifically, the incident surface 43a of the present embodiment is a concave curved surface. This will be explained with reference to FIG. 10. The cross-sectional shape of the incident surface 43a in a cross-sectional section in the longitudinal direction is a curved shape which is curved towards the front surface side. The bearing surface 43a is curved towards the front surface side from both ends towards the center in the longitudinal direction. Moreover, as shown in FIG. 11, the cross-sectional shape of the incident surface 43a in the lateral direction is a curved shape which is curved towards the front surface side. The bearing surface 43a is curved toward the front surface side from both ends toward the center in the lateral direction.
As shown in FIG. 9, the emission surface 43b of the divergence lens 43 is curved such that the central portion is relatively positioned at the rear surface side in comparison with the outer peripheral portion. More specifically, the emission surface 43b of the present embodiment is a concave curved surface. This will be explained with reference to FIG. 10. The cross-sectional shape of the emission surface 43b in a cross-sectional section in the longitudinal direction is a curved shape which is curved towards the rear surface side. The emission surface 43b is curved towards the rear surface side from both ends towards the center in the longitudinal direction. Moreover, as shown in FIG. 11, the cross-sectional shape of the emission surface 43b in a cross-sectional section in the lateral direction is a curved shape which is curved towards the rear surface side. The emission surface 43b is curved toward the rear surface side from both ends towards the center in the lateral direction.
As shown in FIG. 10 and in FIG. 11, the emission surface 43b of the divergence lens 43 faces the rear surface of the liquid crystal unit 11. The light that is emitted from the emission surface 43b enters the liquid crystal unit 11, it is transmitted through the liquid crystal unit 11 and becomes a projection light which moves in the direction of the light reflection unit 8. In other words, the head-up display device 1 projects an image of the liquid crystal unit 11 on the light reflection unit 8 using / with the light that is emitted from the divergence lens 43.
The first diffusion sheet 41 and the second diffusion sheet 44 which are shown in FIG. 4 each diffuse the light. The first diffusion sheet 41 is disposed between the divergence lens 43 and the liquid crystal unit 11. The first diffusion sheet 41 diffuses the light that is emitted from the emission surface 43b of the divergence lens 43 and it causes the light to enter the liquid crystal unit 11. The second diffusion sheet 44 is disposed between the condensation objective 45 and the divergence lens 43. The second diffusion sheet 44 diffuses the light which is emitted from the condensation lens 45 and has the effect that the light enters the incident surface 43a of the divergence lens 43. As a result, in the projection light emission unit 4 of the present embodiment, the light that is emitted from the light source 47b of the light source unit 47 passes through the condensing lens 45, the second diffusion sheet 44, the lens of divergence e 43, the first diffusion sheet 41 and the liquid crystal unit 11 and is projected onto the light reflection unit 8.
The housing 42 is a casing which has a tubular shape and which houses the divergence lens 43, the second diffusion sheet 44 and the lens 45b of the condensation lens 45. The main body unit 45a of the lens The column-shaped protuberance 46b of the support member 46 is inserted into the through-hole 45c of the condensation lens 45 as well as between the support member 46 and the housing 42. 42b of the housing 42. In addition, the columnar-shaped protuberances 46c and 46d of the support member 46 are respectively inserted into a through-hole 44a of the second lamina diffusion 44 and inside the through hole 43c of the divergence lens 43, as well as inside a notch 44b and the notch 43d, and they maintain the second diffusion sheet 44 of the same that the objective of divergence 43.
The shielding / protection casing 12 includes a main body 12a and a fixing unit 12b. The main body 12a is a structural unit which has a frame shape and includes an opening 12c which corresponds to the liquid crystal unit 11. The fastening unit 12b extends towards the rear surface side from the body principal 12a. The fixing unit 12b is attached to the heat radiating element 14 using a screw 15. The main substrate body 47a of the light source unit 47 and the heat transfer sheet 13 are interposed between the 12b and the heat radiation element 14. Moreover, the image display unit 10 and the first diffusion sheet 41 are interposed between the main body 2a and the front surface of the housing 42. The heat transfer sheet 13 is a sheet which has a high thermal conductivity. The heat transfer sheet 13 comes into contact with the rear surface of the light source unit 47 and transfers the heat that is generated by the light source 47b to the heat radiating element 14. The heat transfer element 13 heat radiation 14 radiates the heat that is transferred from the light source unit 47 via the heat transfer sheet 13. The heat radiating element 14 includes a main body 14a which has a plate shape and a fin 14b . The front surface of the main body 14a comes into contact with the heat transfer sheet 13. The fins 14b are provided in a plurality of vanes on the rear surface of the main body 14a.
Operation performed by the rear lighting unit 40 according to the present embodiment will now be described with reference to FIG. 12 and in FIG. 13. As shown in FIG. 12 and in FIG. 13, the light that is emitted from the light source 47b enters the lens 45b from the rear surface side. The light that has passed through the lens 45b is emitted from the front surface of the lens 45b. The light that is emitted from the front surface of the lens 45b is a parallel light that is parallel to the optical axis C1 of the divergence lens 43. In other words, the lens 45b refracts the diverging light that is emitted from the light source 47b and generates a parallel light that moves parallel to the optical axis C1.
The parallel light emitted from the lens 45b enters the incident surface 43a of the divergence lens 43. The incident surface 43a generates a diverging light by refracting the incident parallel light. In other words, the incident surface 43a refracts the incident light that enters from the side of the lens 45b in a separation direction with respect to the optical axis C1. The light that has entered the divergence lens 43 via the incident surface 43a is emitted from the transmitting surface 43b. The emission surface 43b is curved so as to refract the light so that it is emitted in a divergence direction. In other words, when the light that is parallel to the optical axis C1 enters from the incident surface 43a, the divergence lens 43 of the present embodiment refracts the incident light towards the divergence side with respect to to the optical axis C1, both at the incidence surface 43a and at the emission surface 43b. As a result, when the parallel light that has entered the divergence lens 43 passes through the divergence lens 43 and is emitted from the emission surface 43b, the emission light is inclined. and it moves in the separation direction with respect to the optical axis C1, because the emission light moves away from the emission surface 43b towards the front surface side. The divergence objective 43 of the present embodiment diverts the parallel light incident in the longitudinal direction as well as in the lateral direction. In other words, as shown in FIG. 12, the emission light which originates from the divergence lens 43 is subjected to divergence in the longitudinal direction so that it separates from the optical axis C1, because the emission light moves in away from the emission surface 43b. Moreover, as shown in FIG. 13, the emission light which originates from the divergence lens 43 is subjected to divergence in the lateral direction so that it separates from the optical axis C1, because the emission light moves in away from the emission surface 43b. Consequently, as will be described in what follows, it is possible to prevent the irregularity in terms of luminance and the variation of the luminance resulting from a shift of a point of aim / point of view. The eye point is a visual position of the driver. As shown in FIG. 12 and in FIG. 13, the light reflection unit 8 includes a correspondence region 81. The correspondence region 81 is a region that corresponds to a predetermined range with respect to the eye point (hereinafter, this range is referred to as a predetermined range "). When the projection light coming from the projection light emitting unit 4 is a parallel light, the projection light moves without being subject to divergence, as shown in a dotted line Lt1 in FIG. 12 and in FIG. 13. The beam of the projection light is enlarged, as shown in a dotted line Lt2, due to the reflection of light by the reflection surface 51 of the reflection element 5, and the light is projected onto the Correspondence region 81. Correspondence region 81 reflects the projection light toward the predetermined range of the eye point. In other words, the match region 81 is a region that reflects the parallel light that is projected from the projection light emitting unit 4 over the predetermined range.
When the projection light that is coming from the projection light emitting unit 4 is a parallel light, the light that comes from the light source 47b can be focused on the correspondence region 81. As a result, the light coming from the light source 47b can be focused on the predetermined range of the eye point. As a result, it is possible to improve the luminance of a virtual image, when the virtual image is viewed from the eye point in the predetermined range.
Furthermore, the eye point can be deviated from the predetermined range due to a change in posture of the driver or the like. In this case, an image that the driver can view is an image reflected on a surrounding / surrounding region 82 which is an outer portion with respect to the correspondence region 81 of the light reflection unit 8. When the projection light from the projection light emitting unit 4 is a parallel light, the difference in luminance at the projection light between the inside and the outside of the correspondence region 81 is important, and the luminance in the neighboring region 82 is lower than in the correspondence region 81. Therefore, when the eye point is deviated from the predetermined range, the luminance of the virtual image becomes insufficient. This phenomenon can generate feelings of discomfort in the driver. The divergence lens 43 of the rear lighting unit 40 according to the present embodiment diverts the parallel light that enters from the condensation lens 45. Therefore, as shown by means of reference characters Ltd on the Fig. 12 and in FIG. 13, the light that is emitted from the emission surface 43b of the divergence lens 43 moves to the outside of the Lt1 and Lt2 ranges of the parallel projection light. As a result, the projection light is not overly concentrated in the correspondence region 81 and is appropriately dispersed in the surrounding region 82. In other words, the difference between the luminance in the region of correspondence 81 and the luminance in the neighboring region 82 is small. Moreover, in the light reflection unit 8, the luminance is progressively reduced because the light moves away from the correspondence region 81. As a result, the lighting unit Rear 40 of the present embodiment prevents the change of luminance when an eye point is changed.
Fig. 14 shows a luminance distribution in accordance with the head-up display device 1 of the present embodiment. The distribution of the luminance in FIG. 14 shows a relationship between a position of an eye point in the lateral direction [mm] and the luminance in the projection light measured at the [cd / m ^] position. In FIG. 14, a first range A1 is a range corresponding to the correspondence region 81. Furthermore, a second range A2 is a range that corresponds to the neighboring region 82. As shown in FIG. 14, there is no significant difference between the luminance in the first range A1 and the luminance in the second range A2. Moreover, the variation in luminance is small compared to the change of position in the lateral direction.
The distribution of the luminance in FIG. Relates to a comparative example. According to the comparative example, a predetermined objective that emits parallel light is used in place of the divergence objective 43 of the present embodiment. The projection light according to the comparative example is a parallel light. For example, the predetermined objective is an objective that increases the width of the parallel light (the width of the projection light) to be emitted, relative to the width of the incident parallel light. As shown in FIG. 15, according to the comparative example, in comparison with the case of the present embodiment, a significant difference is generated between the luminance in the first range A1 and the luminance in the second range A2. Moreover, the rate of change of the luminance is large compared to the change of position in the lateral direction.
In this manner, the rear lighting unit 40 of the present embodiment which includes the divergence lens 43, and the head-up display device 1 of the present embodiment which includes the rear lighting unit 40 prevent variation of luminance when an eye point is changed. For example, even if the eye point is moved from within the predetermined range to outside the predetermined range, a significant reduction in luminance is difficult to achieve. As a result, it is possible to prevent the driver feels a feeling of discomfort. The divergence lens 43 of the present embodiment diverts light in the lateral direction as well as in the longitudinal direction. The degree of divergence of the light that is diverged due to the divergence objective 43 in the lateral direction is greater than the degree of divergence of the light that is diverged due to the divergence objective 43 in the longitudinal direction. As a consequence, as will be described in the following, it is possible to prevent a variation of the luminance resulting from a modification of an eye point while reducing or even eliminating an increase in the luminance. output that is required for the light source 47b. In general, it is assumed that the eye point changes easily in the width direction of the vehicle and does not easily change in the vehicle height direction. It is assumed that the amplitude and frequency of change in terms of eye point in the width direction of the vehicle are larger than the amplitude and frequency of change in terms of eye point in the direction of height of the vehicle. Therefore, at the divergence objective 43 of the present embodiment, the divergence of the light in the lateral direction is given priority over the divergence of the light in the longitudinal direction. By preventing the light from diverge too much in the longitudinal direction, it is possible to prevent an increase in the output of the light source 47b.
According to this example, the degree of divergence of the light which is diverged due to the divergence objective 43 is the degree of variation of the luminance at the luminance distribution, for example. This will be explained with reference to FIG. 14. The degree of divergence of the diverging light due to the divergence objective 43 in the lateral direction corresponds to the degree of variation of the luminance with respect to / as a function of the change of position in the lateral direction. It is assumed that the degree of variation of the luminance as a function of the relative to the positional change in the lateral direction is reduced, in other words, that the angle of inclination of the luminance distribution curve is reduced, when the degree of divergence of the light which is diverged due to the divergence objective 43 in the lateral direction is increased. Moreover, the degree of divergence of the light that is diverged due to the divergence objective 43 in the lateral direction corresponds to the difference in luminance and the luminance comparison between the luminance in the first Al range and the luminance in the second range A2. In the divergence objective 43 of the present embodiment, the difference in luminance in the lateral direction as described above is smaller than the difference in luminance in the longitudinal direction as described above. In other words, the frequency and magnitude of change in luminance when an eye point is changed in the vehicle width direction is lower than the frequency and magnitude of luminance variation. when the eye point is changed in the vehicle height direction.
Because of the structure in which the degree of divergence of the light differs in the longitudinal direction and in the lateral direction, in the divergence objective 43 of the present embodiment, the shapes of the incident surface 43a and the emission area 43b are determined as follows. For the divergence objective 43, the radius of curvature of the incident surface 43a at a cross-sectional section in the lateral direction (Fig. 11) is smaller than the radius of curvature of the surface of the incidence 43a at a cross section in the longitudinal direction (Fig. 10). If the bearing surface 43a has a non-spherical shape, it is preferable that the cross-sectional radius of curvature value in the lateral direction is smaller than the sectional radius of curvature value. in cross section in the longitudinal direction, this comparatively at the same point on the bearing surface 43a. Moreover, for the divergence objective 43, the radius of curvature of the emission surface 43b at a cross-sectional section in the lateral direction is smaller than the radius of curvature of the emission surface 43b at a cross-sectional section in the longitudinal direction. If the emission surface 43b has a non-spherical shape, it is preferable that the value of the cross-sectional radius of curvature in the lateral direction is smaller than the sectional radius of curvature value. in cross section in the longitudinal direction, this comparatively at the same point on the emission surface 43b.
As described above, the rear lighting unit 40 of the present embodiment includes the light source 47b, the condensing lens 45 which condenses the light that is emitted from the light source 47b and the light source 47b. divergence lens 43 which diverts the light that enters from the condensing lens 45 and transmits it to the light transmission type image display unit 10 of the head-up display device 1. The rear lighting unit 40 of the present embodiment makes it possible to prevent the luminance of a virtual image from changing when an eye point is displaced, by causing the light to diverge using the objective of divergence 43. For example, it is possible to prevent a significant change in luminance when an eye point is moved from within the predetermined range to outside the predetermined range.
Moreover, the divergence objective 43 of the present embodiment is an objective / lens whose two surfaces, namely the incident surface 43a and the emission surface 43b, are concave surfaces. The divergence objective 43 of the present embodiment allows the light to diverge using both the incident surface 43a and the emission surface 43b. As a result, it is possible to increase the degree of overall divergence and divergence angle of the divergence lens 43. When both surfaces, namely the incident surface 43a and the emission surface 43b are concave surfaces, one of the concave surfaces may have a shape to diverge the light in the lateral direction and the other concave surface may have a shape to diverge the light in the longitudinal direction.
Moreover, the divergence objective 43 of the present embodiment diverts the light at least in the lateral direction. In this example, the lateral direction is a direction corresponding to the width direction of the vehicle in the image display unit 10, in other words, it is a direction corresponding to the lateral direction of the driver. while the latter is directly facing the light reflection unit 8. As a result, the divergence objective 43 of the present embodiment makes it possible to prevent a variation of the luminance in a virtual image when eye point is moved in the width direction of the vehicle, when the driver's posture is tilted or shifted in the lateral direction.
Moreover, the divergence objective 43 of the present embodiment diverts light in the lateral direction as well as in the longitudinal direction. According to this example, the longitudinal direction is a direction which corresponds to the height direction of the vehicle in the image display unit 10, in other words, it is a direction corresponding to the longitudinal direction of the driver while the latter is directly facing the light reflection unit 8. The degree of divergence of the light which is diverged due to the divergence objective 43 in the lateral direction is greater than the degree of divergence light that is divergent due to the divergence lens 43 in the longitudinal direction. As a result, at divergence objective 43 of the present embodiment, the divergence of the light in the lateral direction, the lateral direction in which the eye point moves easily, is given priority. Therefore, it is possible to prevent an increase in the output of the light source 47b while providing the required luminance in the predetermined range, preventing divergence of the light in the longitudinal direction or preventing the light from diverge in the longitudinal direction, the longitudinal direction in which the point of eye does not move easily.
The head-up display device 1 of the present embodiment includes the light-transmitting type image display unit 10, the light source 47b, the condensing lens 45 which condenses the light being emitted. from the light source 47b, and the divergence lens 43 which diverts the light which enters from the condensing lens 45 and which emits light towards the image display unit 10. head-up display 1 projects an image of the image display unit 10 on the light reflection unit 8 at the front of the driver's seat by means of the light which is emitted from the lens In other words, the head-up display device 1 emits a diverging light towards the image display unit 10 from its rear surface side and projects an image on the unit. 8 light reflection using the divergent light. As a result, the head-up display device 1 of the present embodiment makes it possible to prevent the variation of the luminance in a virtual image when the point of view is displaced.
It should be understood that the shape, arrangement, number and the like of the condensing lens 45 are not limited to those described in the present embodiment. The condensation objective 45 may be integrally formed with the light source 47b. A condensation unit that condenses the light that is emitted from the light source 47b may be an optical system different from the condensation objective 45.
Modification of the embodiment
A modification of the embodiment will now be described. The shape and arrangement of the divergence lens 43 are not limited to those in the embodiment which has been described above. According to the embodiment which has been described above, the value of the radius of curvature of the surface of incidence 43a is smaller than the value of the radius of curvature of the emission surface 43b. Conversely, the value of the radius of curvature of the emission surface 43b may be equal to or smaller than the value of the radius of curvature of the incidence surface 43a. The divergence lens 43 may be a lens / lens at which at least one of the incident surface 43a and the emission surface 43b is a concave surface. For example, at the divergence lens 43, at least one of the incident surface 43a and the emission surface 43b may be a flat surface. For example, at the divergence objective 43, the incident surface 43a may be a planar surface and the emission surface 43b may be a concave surface.
Moreover, at the divergence objective 43, a surface taken from the incident surface 43a and the emission surface 43b may be a convex surface. In this case, the shapes (such as radii of curvature) of the incident surface 43a and the emission surface 43b are determined so that the light entering from the condensing lens 45 can be derived and transmitted to the image display unit 10. For example, when the incident surface 43a is a convex surface and the emission surface 43b is a concave surface, the value of the radius of curvature of the emission area 43b can be reduced with respect to the value of the radius of curvature of the incident surface 43a. At the divergence objective 43 in which the incident surface 43a is a convex surface and the emission surface 43b is a concave surface, the incident surface 43a which has the convex surface can condense the diverging light which between the light source 47b and can generate a parallel light, and the emission surface 43b which has the concave surface can diverge the light.
A divergence unit that diverts the light that enters from the condensing unit and emits light toward the image display unit 10 is not limited to the divergence lens 43. Another An optical system whose function is to diverge the light can be used instead of the divergence objective 43.
The disclosed contents according to the embodiment presented above and the modification presented above can be implemented by combining them appropriately. The rear lighting unit and the head-up display device according to the embodiment include the light source; the condensing unit which condenses the light emitted from the light source / and the unit of divergence which diverts the light which enters from the condensing unit and which emits the divergent light towards the unit of light image display of the light transmission type in the head-up display device. The rear lighting unit and the head-up display device according to the embodiment advantageously make it possible to prevent the variation of the luminance in an image due to the change of an eye point, by projecting a image of the image display unit using divergent light.
Although the invention has been described in connection with specific embodiments in order to provide complete and clear disclosure / description, the appended claims should not be so limited but should be interpreted in the sense of implementation. of all the modifications and alternative constructions that may come to the mind of those skilled in the art provided that these modifications and alternative constructions are part of the basic teaching highlighted here.

权利要求:
Claims (6)
[1" id="c-fr-0001]
A rear lighting unit, comprising: a light source; a condensation unit which is configured to condense the light emitted from the light source / and a divergence unit which is configured to diverge light which enters from the condensing unit and thereby transmitting to a light transmission type image display unit in a head-up display device.
[2" id="c-fr-0002]
The rear lighting unit according to claim 1, wherein: the divergence unit is a lens / lens at which at least one of an incident surface in which the light from the condensing unit enters and an emission surface from which light is emitted in the direction of the image display unit is a concave surface.
[3" id="c-fr-0003]
The rear lighting unit according to claim 1, wherein: the divergence unit is a lens / lens at which both surfaces are an incident surface in which the light from 1 The condensing unit as well as a transmitting surface from which light is emitted in the direction of the image display unit are concave surfaces.
[4" id="c-fr-0004]
The rear lighting unit according to any of claims 1 to 3, wherein: the divergence unit diverts the light at least in a direction corresponding to a vehicle width direction in the unit of image display.
[5" id="c-fr-0005]
A rear lighting unit according to any of claims 1 to 3, wherein: the divergence unit diverts light in a lateral direction which is a direction corresponding to a vehicle width direction, and in a longitudinal direction which is a direction corresponding to a vehicle height direction, in the image display unit / and a degree of divergence of the light which is subject to divergence by the unit of divergence in the direction Lateral is greater than a degree of divergence of light that is subject to divergence by the unity of divergence in the longitudinal direction.
[6" id="c-fr-0006]
A head-up display apparatus, comprising: a light transmission type image display unit which is configured to display an image / light source; a condensing unit that is configured to condense the light that is emitted from the light source; and a divergence unit which is configured to diverge light that enters from the condensing unit and transmit it to the image display unit, wherein: the image is projected onto a light reflection unit at the front of a driver's seat with light that is emitted from the divergence unit.

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同族专利:

公开号 | 公开日

FR3049357B1|2020-03-06|

JP6417352B2|2018-11-07|

DE102017204687B4|2022-01-13|

CN107329317A|2017-11-07|

DE102017204687A1|2017-09-28|

CN107329317B|2021-01-01|

JP2017174542A|2017-09-28|

US20170276936A1|2017-09-28|

US10473928B2|2019-11-12|

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法律状态:
2018-03-29| PLFP| Fee payment|Year of fee payment: 2 |

2018-11-23| PLSC| Publication of the preliminary search report|Effective date: 20181123 |

2019-03-29| PLFP| Fee payment|Year of fee payment: 3 |

2020-03-31| PLFP| Fee payment|Year of fee payment: 4 |

2021-02-10| PLFP| Fee payment|Year of fee payment: 5 |

2022-02-09| PLFP| Fee payment|Year of fee payment: 6 |

优先权:

申请号 | 申请日 | 专利标题

JP2016-057040|2016-03-22|

JP2016057040A|JP6417352B2|2016-03-22|2016-03-22|Backlight unit and head-up display device|

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