• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    A light emitting device includes a planar light emitting body (22) configured to emit light in a planar form, and a transparent member (24) configured to control light from the planar light emitting body (22). The transparent member (24) has a light incident surface (25) arranged to face the light emitting surface (22a) of the planar light emitting body (22) and configured to cause light from the planar light emitting body (22) is incident on the transparent element (24) and a light emitting surface (26) configured to emit outwardly the light propagating in the transparent element (24). The transparent element (24) is formed to extend in a predetermined direction and formed so that the distance between the light incidence surface (25) and the light emission surface (26) varies in function of the position in the predetermined direction.
    公开号:FR3027094A1
    申请号:FR1559525
    申请日:2015-10-07
    公开日:2016-04-15
    发明作者:Toru Ito；Masaya Shido；Takayuki Otsubo
    申请人:Koito Manufacturing Co Ltd；
    IPC主号:
    专利说明:

    [0001] BACKGROUND TECHNICAL FIELD The present disclosure relates to a light emitting device and a vehicle lamp using the light emitting device. ASSOCIATED TECHNIQUE [0002] In the related art, for decreasing the thickness and dimensions of a vehicle lamp, a vehicle lamp which uses a planar light emitting body, such as an organic EL (electroluminescent) panel as that light source has been suggested (see for example, patent document 1). [0004] Patent document 1: Japanese Patent Publication No. 2011-150887. A planar light emitting body such as an organic EL panel has a flat light emitting surface. As a result, a vehicle lamp using a planar light emitting body tends to be of uniform design. SUMMARY [0005] Exemplary embodiments of the invention provide a light emitting device using a planar light emitting body, the design of which is improved and a vehicle lamp including the light emitting device. [0006] A light emitting device according to an exemplary embodiment comprises: a planar light emitter body configured to emit light in a planar form; and a transparent element configured to control light from the planar light emitting body. The transparent element has a light incident surface arranged to be turned towards the light emitting surface of the planar light emitting body and configured so that the light from the planar light emitting body is incident on the light emitting surface. transparent element and a light-emitting surface configured to emit outwardly the light propagating in the transparent element. The transparent element is formed to extend in a predetermined direction and formed such that the distance between the light incident surface and the light emission surface varies according to the position in the predetermined direction . The term "propagation" here includes not only a phenomenon such that light is transmitted through a lens or the like, but also a phenomenon such that the light travels while being reflected completely and repeatedly within a lens. light guide. [0007] The light incident surface may be shaped in a wavy or step form in the predetermined direction. The transparent element may comprise a portion bent between the light incident surface and the light emission surface. The folded portion may be separated from the light emitting surface in the normal direction of the light emitting surface of the planar light emitting body. The light emitting surface can be folded in the predetermined direction. An air layer may be provided between the light emitting surface of the planar light emitting body and the transparent element. [0012] A diffusion method for diffusing light emitted outwardly by the light emitting surface may be performed on at least a portion of the light emitting surface. The diffusion process may be a frosting process. In addition, the diffusion process may be a method of bonding a diffusion element such as a diffusion sheet to a light emitting surface. Another aspect of the present invention is a vehicle lamp using the light emitting device described above as a light source. According to the present invention, it is possible to improve the design of a light emitting device and a vehicle lamp, which utilize a planar light emitting body. BRIEF DESCRIPTION OF THE DRAWINGS The invention will be well understood and its advantages will be better understood on reading the detailed description which follows. The description refers to the following drawings, which are given by way of example. FIG. 1 is a schematic sectional view for explaining a vehicle lamp according to one embodiment of the present invention. Fig. 2 is an exploded schematic perspective view of a light emitting device according to the embodiment of the present invention. Fig. 3 is a schematic exploded perspective view of a light emitting device according to another embodiment of the present invention. Figure 4 is an exploded schematic perspective view of a light emitting device according to yet another embodiment of the present invention. Figure 5 is an exploded schematic perspective view of a light emitting device according to yet another embodiment of the present invention.
    [0002] Figure 6 is an exploded schematic perspective view of a light emitting device according to yet another embodiment of the present invention. Fig. 7 is a view for explaining an assembly structure of the light emitting device according to the embodiment of the present invention.
    [0003] Fig. 8 is a view for explaining another assembly structure of the light emitting device according to the embodiment of the present invention. Fig. 9 is a view for further explaining another assembly structure of the light emitting device according to the embodiment of the present invention. Figs. 10A and 10B are views for explaining an advantage obtained by providing an air layer between an organic EL panel and a transparent element.
    [0004] Figure 11 is a schematic perspective view of a light emitting device according to yet another embodiment of the present invention. FIG. 12 is a schematic front view of a vehicle lamp using the light emitting device shown in FIG. 11. FIG. 13 is a diagrammatic sectional view along line AA of the vehicle lamp shown in FIG. 12. FIG. 14 is a schematic sectional view along the line BB of the vehicle lamp shown in FIG. 12.
    [0005] Fig. 15 is a schematic perspective view of a light emitting device according to yet another embodiment of the present invention.  Fig. 16 is a schematic exploded perspective view of a light emitting device according to yet another embodiment of the present invention.  Figs. 17A to 17C are views showing a modified example of the light emitting device shown in Fig. 16.  DETAILED DESCRIPTION [0016] A light emitting device according to an embodiment of the present invention and a vehicle lamp using the light emitting device will be described in detail with reference to the drawings.  In the present description, in the case where a direction indicator term such as "upper", "lower", "front", "back", "left", "right", "inside" and "outside" is used. this term 3027094 denotes a direction in a posture in which a vehicle lamp is mounted on a vehicle.  Fig. 1 is a schematic sectional view for explaining a vehicle lamp 10 according to an embodiment of the present invention.  The vehicle lamp 10 shown in Figure 1 is a rear lamp which is provided in the rear left portion of a vehicle.  As shown in FIG. 1, the vehicle lamp 10 comprises a lamp body 12, a transparent cover 14 for covering the front opening portion of the lamp body 12 and a light emitting device 20 provided in a lamp chamber 16 which is defined by the lamp body 12 and the lid 14.  The light emitting device 20 is attached to the lamp body 12 by a support member (not shown).  As shown in Figure 1, the cover 14 has a shape that follows the shape of the rear portion of the vehicle and is gently inclined to the front of the vehicle to the outer side from the inner side 20 of the vehicle.  Figure 2 is a schematic perspective exploded view of the light emitting device 20 according to the embodiment of the present invention.  As shown in FIGS. 1 and 2, the light emitting device 20 comprises three planar organic EL panels 22 and a transparent element 24 which is formed and arranged to cover the light emitting surfaces 22a of the organic EL panels 22.  Each of the organic EL panels 22 emits light in planar form.  The transparent member 24 controls the light from the organic EL panels 22 and emits light toward the front of the vehicle.  Although the organic EL panel is illustrated as an example of the planar light emitting body in the present embodiment, the planar light emitting body is not limited to the organic EL panel.  The transparent element 24 is a substantially columnar body (columnar body having a semi-cylindrical section) which is formed in such a way as to extend in the width direction of the vehicle (inside direction). -out of the vehicle).  The transparent element 24 may be formed of an optical glass or a transparent resin, for example an acrylic resin.  The transparent element 24 has a light incidence surface 25 arranged to be turned towards the light-emitting surfaces 22a of the organic EL panels 22 and a light-emitting surface 26 arranged so as to face the light-emitting surfaces. light incidence surface 25.  The light incident on the transparent element 24 from the light incident surface 25 propagates (is transmitted) into the transparent element 24 and then emitted outwards by the light-emitting surface 26.  As shown in FIG. 1, the light-emitting surface 26 of the transparent element 24 has a shape which follows the shape of the cover 14 and is inclined gently towards the front of the vehicle towards the outer side from the inside of the vehicle.  On the other hand, the light incident surface 25 of the transparent element 24 is formed in a stepwise fashion in the width direction of the vehicle.  The step light incidence surface 25 is comprised of three stepped surfaces 25a facing the light-emitting surface 26 and two stair surfaces 25b connecting the stepped surfaces 25a.  An organic EL panel 22 is arranged to face each step surface 25a.  In the present embodiment, the light emitting surface 22a of the organic EL panel 22 and the step surface 25a of the light incident surface 25 of the transparent element 24 are separated from each other and an air layer is provided between them.  In this way, the transparent element 24 comprises the light incidence surface 25 which is formed in a stepwise manner in the width direction of the vehicle, and the light emitting surface 26 which is tilted gently to the front of the vehicle towards the outside from the inside of the vehicle.  Since the light incident surface 25 and the light emitting surface 26 are configured in this manner, the transparent element 24 of the present embodiment is configured such that the distance between the light incidence surface 25 and the light emitting surface 26 varies depending on the position in the width direction of the vehicle.  In the present embodiment, the term "distance" here means the linear distance between the light incidence surface 25 and the light emitting surface 26.  By changing in this way the distance between the light incidence surface 25 and the light emission surface 26 as a function of the position in the width direction of the vehicle, the light emitting device 20 according to the present mode. The embodiment may have a depth feel (three-dimensional aspect) to an observer during light emission, thereby improving the design.  It will be appreciated that the light emitting device 20 according to the present embodiment can have a feeling of depth using the flat organic EL panel 22.  In addition, it is generally difficult for the EL plane board to follow the curved surface of the cover 14.  However, using the transparent element 24 according to the present embodiment, the light-emitting surface of the front surface of the transparent element 24 is shaped to follow the curved surface of the cover 14 and the surface 20 The light incidence of the rear surface of the transparent element 24 is shaped to face the organic EL panel.  As a result, the light-emitting surface 26 provides a similar appearance to the case where the planar organic EL panel is arranged on the curved surface of the cover 14.  FIG. 3 is an exploded schematic perspective view of a light emitting device 30 according to another embodiment of the present invention.  The light emitting device 30 also includes three organic EL panels 22 and the transparent element 24 which is a substantially columnar body.  The light-emitting surface 26 of the transparent member 24 has a shape which follows the shape of the cover 14 and is gently inclined at the front of the vehicle towards the outer side from the inside of the vehicle.  On the other hand, the light incidence surface 25 of the transparent element 24 is made up of three flat surfaces 32 arranged side by side in the width direction of the vehicle.  These three flat surfaces 32 are folded and interconnected.  An organic EL panel 22 is arranged to face each planar surface 32.  On the other hand, in the present embodiment, the light emitting surface 22a of the organic EL panel 22 and the flat surface 32 of the light incident surface 25 of the transparent element 24 are separated from each other. the other and a layer of air is provided between them.  On the other hand, in the light emitting device 30 according to the present embodiment, the distance between the light incidence surface 25 and the light emitting surface 26 varies according to the position in the light emitting device 30. the direction of the width of the vehicle.  Accordingly, the light emitting device 30 according to the present embodiment may also have a sensation of depth (three-dimensional aspect) to an observer during light emission, thereby improving the design.  Further, also in the light emitting device 30 according to the present embodiment, the light emitting surface 26 provides a similar appearance in the case where the EL panel is arranged on the curved surface of the lid 14, despite the fact that the organic EL panel 22 is used.  FIG. 4 is a schematic exploded perspective view of a light emitting device 40 according to yet another embodiment of the present invention.  The light emitting device 40 also includes the organic EL panel 22 having a curved shape and the transparent element 24 which is substantially columnar shaped.  The light emitting surface 26 of the transparent element 24 has a shape which follows the shape of the cover 14 and is gently inclined on the front side of the vehicle towards the outer side from the inside of the vehicle.  On the other hand, the light incidence surface 25 of the transparent element 24 is shaped in undulated form (for example, in sinusoidal form) in the width direction of the vehicle.  In the light emitting device 40 according to the present embodiment, the organic EL panel 22 is a flexible organic EL panel 35.  The organic EL panel 22 has a wavy shape (for example, a sinusoidal shape) in the width direction of the vehicle so as to correspond to the light incident surface 25 of the transparent element 24.  The organic EL panel 22 is arranged such that the light emitting surface 22a corresponds to the light incident surface 25.  On the other hand, in the present embodiment, the light-emitting surface 22a of the organic EL panel 22 and the light incident surface 25 of the transparent element 24 are separated from each other and an layer of air is provided between them.  On the other hand, in the light emitting device 40 according to the present embodiment, the distance between the light incident surface 25 and the light emitting surface 26 varies according to the position in the light emitting device 40. the direction of the width of the vehicle.  Accordingly, the light emitting device 40 according to the present embodiment can also have a depth feel (three-dimensional appearance) to an observer during light emission, thus improving the design.  [0030] FIG. 5 is a diagrammatic perspective exploded view of a light emitting device 50 according to yet another embodiment of the present invention.  The light emitting device 50 also includes the organic EL panel 22 having a curved shape and the transparent element 24 which is substantially columnar shaped.  The light emitting surface 26 of the transparent member 24 has a shape which follows the shape of the cover 14 and is gently inclined at the front of the vehicle towards the outer side from the inside of the vehicle.  In the present embodiment, the light emitting surface 26 of the transparent element 24 has a V-shaped section.  On the other hand, the light incidence surface 25 of the transparent element 24 is shaped in undulated form (for example, sinusoidally) in the width direction of the vehicle.  On the other hand, in the light emitting device 50 according to the present embodiment, the organic EL panel 22 is a flexible organic EL board.  The organic EL panel 22 has a wavy shape (for example, a sinusoidal shape) in the width direction of the vehicle so as to correspond to the light incident surface 30 of the transparent element 24.  The organic EL panel 22 is arranged such that the light emitting surface 22a corresponds to the light incident surface 25.  On the other hand, in the present embodiment, the light-emitting surface 22a of the organic EL panel 22 and the light incident surface 25 of the transparent element 24 are separated from one another and an layer of air is provided between them.  On the other hand, in the light emitting device 50 according to the present embodiment, the distance between the light incident surface 25 and the light emitting surface 26 varies depending on the position in the light emitting device 50. the direction of the width of the vehicle.  As a result, the light emitting device 50 according to the present embodiment can also have a sensation of depth (three-dimensional aspect) to an observer during the light emission, thereby improving the design.  Figure 6 is a schematic exploded perspective view of a light emitting device 60 according to yet another embodiment of the present invention.  The light emitting device 60 also includes the organic EL panel 22 having a curved shape and the transparent element 24 which is a substantially columnar body.  The light-emitting surface 26 of the transparent member 24 has a shape which follows the shape of the cover 14 and is gently inclined at the front of the vehicle towards the outer side from the inside of the vehicle.  In the present embodiment, the light emitting surface 26 of the transparent element 24 has a triangular section.  On the other hand, the light incident surface 25 of the transparent element 24 is shaped in undulated form (for example, in sinusoidal form) in the width direction of the vehicle.  On the other hand, in the light emitting device 60 according to the present embodiment, the organic EL panel 22 is a flexible organic EL board.  The organic EL panel 22 has a wavy shape (for example, a sinusoidal shape) in the width direction of the vehicle so as to correspond to the light incident surface 25 of the transparent element 24.  The organic EL panel 22 is arranged so that the light emitting surface 22a corresponds to the light incident surface 25.  On the other hand, in the present embodiment, the light-emitting surface 22a of the organic EL panel 22 and the light-incident surface 25 of the transparent element 24 are separated from each other and the layer of air is provided between them.  On the other hand, in the light emitting device 60 according to the present embodiment, the distance between the light incidence surface 25 and the light emitting surface 26 varies according to the position in the light emitting device 60. the direction of the width of the vehicle.  As a result, the light emitting device 60 according to the present embodiment can also have a sensation of depth (three-dimensional aspect) to an observer during light emission, thus improving the design.  Fig. 7 is a view for explaining an assembly structure of the light emitting device according to the embodiment of the present invention.  FIG. 7 is a sectional view perpendicular to the extension direction of a light emitting device 70.  As shown in Fig. 7, the light emitting device 70 is configured so that the light emitting surface 22a of the organic EL panel 22 and the light incident surface 25 of the transparent element 24 are separated from each other. the other and an air layer 72 is provided between them.  The light emitting device 70 shown in FIG. 7 is configured so that the organic EL panel 22 and the transparent element 24 are fixed to each other by an adhesive 74.  The adhesive 74 is provided on a non-emitting portion 22b which is located on an end portion of the organic EL panel 22 and thus does not block light emitted by a light emitting portion 22c.  The adhesive 74 also serves to define the distance between the light emitting surface 22a of the organic EL panel 22 and the light incident surface 25 of the transparent element 24.  Fig. 8 is a view for explaining another assembly structure of the light emitting device according to the embodiment of the present invention.  Fig. 8 is a sectional view perpendicular to the extension direction of a light emitting device 80.  As shown in FIG. 8, the light emitting device 80 is configured so that the light emitting surface 22a of the organic EL panel 22 and the light incident surface 25 of the transparent element 24 are separated from each other. the other and the air layer 72 is provided between them.  The light emitting device 80 shown in Fig. 8 has a spacer 82 for defining the distance between the light emitting surface 22a of the organic EL panel 22 and the light incident surface 25 of the light emitting surface 22a. transparent element 24.  The spacer element 82 is located between them.  Further, the light emitting device 80 includes a bracket 84 for clamping and securing the transparent element 24, the spacer 82, and the organic EL panel 22.  The light emitting device 80 according to the present embodiment is configured so that the spacer 82 is provided on the non-emitting portion 22b which is located on the end portion of the organic EL panel 22. and thus, does not block the light emitted by the light emitting portion 22c.  FIG. 9 is a view for further explaining another assembly structure of the light emitting device according to the embodiment of the present invention.  FIG. 9 is a sectional view perpendicular to the extension direction of a light emitting device 90.  As shown in FIG. 9, the light emitting device 90 is configured so that the light emitting surface 22a of the organic EL panel 22 and the light incident surface 25 of the transparent element 24 are separated one by one. on the other and the air layer 72 is provided between them.  In the light emitting device 90 shown in FIG. 9, a protruding portion 92 for defining the distance between the light-emitting surface 22a of the organic EL panel 22 and the light incident surface 25 of the transparent element 24 is formed on an end portion of the light incident surface 25 of the transparent element 24.  The light emitting device 90 is assembled in such a way that the transparent element 24, the protruding portion 92 of the transparent element 24 and the organic EL panel 22 are clamped by the bracket 84.  The light emitting device 90 according to the present embodiment is configured so that the protruding portion 92 is provided on the non-emitting portion 22b which is located on an end portion of the organic EL panel 22 and thus does not block the light emitted by the light emitting part 22c.  [0044] FIGS. 10A and 10B are views for explaining a benefit obtained by providing the air layer 72 between the organic EL panel 22 and the transparent element 24.  It is assumed that the refractive index of air is equal to 1.  Further, it is assumed that the refractive index of both the organic EL board 22 and the transparent member 24 is 1.5.  FIG. 10A shows a comparative example where the light emitting surface 22a of the organic EL panel 22 is in close contact with the light incident surface 25 of the transparent element 24 and no air layer is present.  It is assumed at this time that the light emitted by the light-emitting surface 22a at an angle θ1 is incident on the transparent element 24 at an angle θ2.  Since the refractive index of the organic EL panel 22 is equal to that of the transparent element 24 and no air layer is present, there is no refraction at the interface between the EL panel. organic 22 and the transparent element 24, and 01 is equal to 02 (01 = 02).  On the other hand, the critical angle Oc at the lateral surface 24a of the transparent element 24 satisfies the following relationship Oc = sin-1 (1 / 1.5) = 41.8 °.  Assuming that the angle of incidence on the lateral surface 24a of the incident light on the transparent element 24 is equal to 03, light is emitted by the lateral surface 24a of the transparent element 24 when the light is incident on the transparent element 24. is less than 41.8 °.  That is, since O3 equals (90 ° -02), light is emitted from the side surface 24a of the transparent element 24 when the relation O2 = O1 = 48.2 ° or greater is satisfied.  In the case where the amount of light emitted by the side surface 24a is increased, there is a possibility that the intensity of the light emitted by the light emitting surface 26 decreases.  FIG. 10B shows an example where the air layer 72 is provided between the light emitting surface 22a of the organic EL panel 22 and the light incident surface 25 of the transparent element 24.  It is assumed at this time that the light incident on the light incidence surface 25 of the air layer 72 is at an angle O1 '(= 90 °).  The light is refracted at the interface between the air layer 72 and the light incident surface 25 at an angle O2 '(= 41.8 °).  The angle θ 'in which the light is incident on the lateral surface 24a of the transparent element 24 satisfies the following relationship θ = 90 ° - 41.8 ° = 48.2 °.  Since 03 '(= 48.2 °) is greater than the critical angle ((= 41.8 °) of the side surface 24a, the light is totally reflected at the side surface 24a and emitted by the surface of the side surface 24a. light emission 26.  Since the light incident on the light incidence surface 25 at an angle θ (= 90 °) is emitted by the light emitting surface 26 in this manner, all the light incident on the surface of incidence of light An angle 01 'of 90 ° or less is theoretically emitted by the light-emitting surface 26.  In this way, by providing the air layer 72 between the light-emitting surface 22a of the organic EL panel 22 and the light-incident surface 25 of the transparent element 24, it is possible to increase the intensity. of the light emitted by the light emitting surface 26 with respect to the comparative example above.  That is, according to the light emitting device of the present embodiment, it is possible to improve the efficiency of use of the light.  [0047] FIG. 11 is a schematic perspective view of a light emitting device 110 according to yet another embodiment of the present invention.  Fig. 12 is a schematic front view of a vehicle lamp 120 utilizing the light emitting device 110 shown in Fig. 11.  Fig. 13 is a schematic sectional view through the line A-A of the vehicle lamp 120 shown in Fig. 12.  Fig. 14 is a schematic sectional view through the line B-B of the vehicle lamp 120 shown in Fig. 12.  The vehicle lamp 120 of the present embodiment and a rear lamp provided in the rear right portion of a vehicle.  As shown in Fig. 13, the cover 14 of the vehicle lamp 120 has a shape which follows the shape of the rear part of the vehicle and is gently inclined at the front of the vehicle towards the outer side from the inside of the vehicle .  As shown in FIGS. 11 to 14, the light emitting device 110 comprises an organic EL panel 22 having a planar shape and a transparent element 124 for controlling light from the organic EL panel 22 to emit light to the light source. 'before the lamp.  As shown in FIGS. 11 to 14, the organic EL panel 122 is an elongate organic EL panel which is shaped to extend in the direction of the width of the vehicle (inside-outside direction of the vehicle).  The central portion of the organic EL panel 122 is curved at the front of the vehicle toward the outer side from the inside of the vehicle.  The organic EL panel 122 is arranged so that its light emitting surface 122a is turned downward.  In the present embodiment, the organic EL panel is illustrated as an example of the planar light emitter body.  However, the planar light emitting body is not limited to the organic EL panel.  As shown in FIGS. 11 to 14, the transparent element 124 is a flat-shaped light guide that is curved three-dimensionally.  The transparent element 124 extends not only in the width direction of the vehicle (inside-outside direction of the vehicle) but also in the direction of the length of the vehicle (forward direction of the vehicle).  A side surface of the transparent member 124 is formed as a light incident surface 124a on which light from the organic EL panel 122 is incident.  In addition, another side surface of the transparent member 124 opposite the light incident surface 124a is formed as a light emitting surface 124b for emitting light propagating (guided) in the transparent element. towards the front of the lamp.  The transparent element 124 is arranged so that the light incident surface 124a is turned towards the light emitting surface 122a of the organic EL panel 122 and the light emitting surface 124b is turned towards the front of the lamp.  On the other hand, in the present embodiment, the light emitting surface 122a of the organic EL panel 122 and the light incident surface 124a of the transparent element 124 are separated from each other and an air layer is provided between them.  As shown in FIG. 14, the light emitted by the light emitting surface 122a of the organic EL panel 122 is incident on the transparent element 124 from the light incident surface 124a.  The light incident on the transparent element 124 advances while repeating the total reflection within the transparent element 124 and is emitted outwardly from the light emitting surface 124b, i.e. towards the front of the lamp.  On the other hand, in the transparent element 124 of the present embodiment, the distance between the light incident surface 124a and the light emitting surface 124b varies according to the position in the direction the width of the vehicle.  In the present embodiment, the term "distance" here means the distance in the direction of extension from the light incident surface 124a to the light emitting surface 124b.  Since in this way the distance between the light incident surface 124a and the light emitting surface 124b varies depending on the position in the width direction of the vehicle, the light emitting device 110 according to the present invention. Embodiment may have a feeling of depth (three-dimensional aspect) to an observer during light emission, thereby enhancing the design.  The light emitting device 110 according to the present embodiment may also have a feeling of depth using the organic EL panel 122.  In addition, the transparent element 124 according to the present embodiment has a folded portion 124c between the light incident surface 124a and the light emitting surface 124b, as can be seen in the figures. 11 and 14.  The folded portion 124c is folded forward of the lamp relative to the vertical direction.  The folded portion 124c is separated from the light emitting surface 124b in the normal direction of the light emitting surface of the organic EL panel 122.  That is, as shown in Fig. 14, the folded portion 124c of the transparent member 124 is located at a distance D below the light emitting surface 124b.  Since the transparent member 124 includes such a folded portion 124c, the light emitting device 110 according to the present embodiment may further have a depth feel to an observer during light emission.  In addition, the light-emitting surface 124b of the transparent element 124 according to the present embodiment has a folded portion 124d, folded in the width direction of the vehicle, as can be seen in FIGS. Figures 11 and 12.  The folded portion 124 may have a wavy shape as shown for example in Figures 11 and 12.  Since the light-emitting surface 124b has such a folded portion 124d, the light-emitting device 110 according to the present embodiment can further present a sense of depth to an observer during light emission.  [0057] Fig. 15 is a schematic perspective view of a light emitting device 150 according to still another embodiment of the present invention.  A transparent element 154 of the light emitting device 150 shown in Fig. 15 has a shape different from that of the transparent element 124 of the light emitting device 110 described above.  Between a light incident surface 154a and a light emitting surface 154b, the transparent element 154 of the present embodiment has a second folded portion 154d folded rearwardly of the lamp from the vertical direction, in addition to a first folded portion 154c, folded towards the front of the lamp from the vertical direction.  In addition, the organic EL panel 122 is arranged so that its light emitting surface 122a faces the front of the lamp.  The light emitting device 150 according to the present embodiment is configured so that the light emitted by the light emitting surface 122a of the organic EL panel 122 is incident on the transparent element 154 from the light incident surface 154a.  The light incident on the transparent member 154 passes successively through the second folded portion 154d and the first folded portion 154c, while repeating the total reflection within the transparent member 154 and is then emitted outwardly from the light emitting surface 154b, that is to say toward the front of the lamp.  The second folded portion 154d being provided in addition to the first folded portion 154c, the transparent member 154 of the present embodiment may further provide a depth feel to an observer during light emission, thereby improving the design.  The light emitting device 150 according to the present embodiment can also have a feeling of depth using the flat organic EL panel 122.  Fig. 16 is an exploded schematic perspective view of a light emitting device 200 according to yet another embodiment of the present invention.  Similar to the light emitting device 30 shown in FIG. 3, the light emitting device 200 according to the present embodiment comprises three organic EL panels 22 and the transparent element 24 which is a substantially columnar body.  The light emitting surface 22a of the organic EL panel 22 and the flat surface 32 of the light incident surface 25 of the transparent element 24 are separated from each other and a layer of air is provided between they.  On the other hand, in the light emitting device 200 according to the present embodiment, the distance between the light incidence surface 25 and the light emitting surface 26 varies according to the position in the direction of the light. the width of the vehicle.  The light emitting surface 26 of the transparent element 24 has a semi-cylindrical section.  In the light-emitting device 200 according to the present embodiment, a diffusion method (indicated by hatching) for diffusing light emitted outwards by the light-emitting surface 26 is performed on the light emitting surface 26 of the transparent element 24.  The diffusion process may be a frosting process for example.  Alternatively, the diffusion method may be a method of bonding a diffusion element such as a diffusion sheet to the light-emitting surface.  The diffusion method may be performed over the entire surface of the light-emitting surface 26 or may be performed on a portion of the light-emitting surface 26.  In addition, a mirror finishing process can be performed on the side surface 24a of the transparent element 24.  In the light emitting device 200 according to the present embodiment, the diffusion process is performed on the light emitting surface 26 of the transparent element 24.  As a result, the organic EL panel 22 is hardly visible from the outside and the shape of the light emitting surface 26 is easily visible.  Accordingly, the portion of the light-emitting surface 26 on which the diffusion process is performed may give an impression such as floating in the air to an observer, thereby improving the design.  Note that the light emitting device 20 according to the present embodiment may have the printing as described above using the organic EL panel 22.  Figs. 17A to 17C are views showing a modified example of the light emitting device shown in Fig. 16.  Figs. 17A-17C show part of the transparent element 24.  In Figs. 17A to 17C, only the transparent member 24 is shown and the organic EL panel 22 is not shown.  As shown in FIGS. 17A-17C, the light-emitting surface 26 is not limited to the semi-cylindrical sectional shape but may take various forms.  In Fig. 17A, the light emitting surface 26 of the transparent member 24 has a planar shape.  The diffusion process is performed on the light emitting surface 26 having the planar shape.  In Fig. 17B, the light emitting surface 26 of the transparent member 24 has a three-dimensional curved shape.  The diffusion process is performed on the light-emitting surface 26 having the three-dimensional curved shape.  In Fig. 17C, the light emitting surface 26 of the transparent member 24 has a triangular section.  The diffusion process is performed on the light emitting surface 26 having the triangular section.  Similar to the light emitting device 200 shown in Fig. 16, also in each example shown in Figs. 17A to 17C, the portion of the light emitting surface 26 on which the diffusion process is performed can give the impression of floating in the air to an observer, thus improving the design.  In each example shown in FIGS. 17A to 17C, the mirror finishing process may be performed on the lateral surface 24a of the transparent element 24.  Further, in place of the mirror finishing method, the diffusion process may be performed on a portion 24a 'of the side surface 24a of the transparent element 24 which is close to the light emitting surface 26.  [0066] The present invention has been described above based on the embodiments.  It will be appreciated by those skilled in the art that these embodiments are explanatory, various modified examples of combinations of each component or process are possible, and such modified examples are within the scope of the present invention.
    权利要求:
    Claims (9)
    [0001]
    REVENDICATIONS1. A light emitting device characterized in that it comprises: a planar light emitting body (22) configured to emit light in planar form; and a transparent member (24) configured to control light from the planar light emitting body (22), the transparent member (24) having a light incident surface (25) and a light emitting surface ( 26), the light incident surface (25) being arranged to face the light emitting surface (22a) of the planar light emitting body (22) and configured so that light from the light emitting body plane (22) is incident on the transparent element (24), the light-emitting surface being configured to emit to the outside the light propagating in the transparent element (24), wherein the transparent element (24) is formed to extend in a predetermined direction and formed such that the distance between the light incidence surface (25) and the light emission surface (26) varies according to the position in the predicted direction erminée.
    [0002]
    The light emitting device according to claim 1, wherein the light incident surface (25) is shaped in a wavy or step form in the predetermined direction.
    [0003]
    The light emitting device according to claim 1, wherein the transparent element (24) has a portion bent between the light incident surface (25) and the light emitting surface (26).
    [0004]
    The light emitting device according to claim 3, wherein the folded portion is separated from the light emitting surface (26) in the normal direction of the light emitting surface (26) of the planar light emitting body (22).
    [0005]
    The light emitting device according to claim 3 or 4, wherein the light emitting surface (26) is folded in the predetermined direction. 3027094 22
    [0006]
    The light emitting device according to any one of claims 1 to 5, wherein an air layer (72) is provided between the light emitting surface (22a) of the planar light emitting body (22) and the transparent element (24). 5
    [0007]
    The light emitting device according to any one of claims 1 to 6, wherein a scattering method for diffusing light emitted outwardly by the light-emitting surface (26) is performed on at least a portion the light emitting surface (26).
    [0008]
    The light emitting device according to claim 7, wherein the diffusion method is a frosting process.
    [0009]
    A vehicle lamp comprising the light emitting device according to any one of claims 1 to 8 as a light source.
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    同族专利:
    公开号 | 公开日
    CN105508957A|2016-04-20|
    CN105508957B|2019-09-03|
    US10151441B2|2018-12-11|
    DE102015219081A1|2016-04-14|
    FR3027094B1|2019-05-03|
    US20160102833A1|2016-04-14|
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    法律状态:
    2016-09-12| PLFP| Fee payment|Year of fee payment: 2 |
    2017-09-05| PLFP| Fee payment|Year of fee payment: 3 |
    2018-03-30| PLSC| Search report ready|Effective date: 20180330 |
    2018-08-31| PLFP| Fee payment|Year of fee payment: 4 |
    2019-08-28| PLFP| Fee payment|Year of fee payment: 5 |
    2020-09-14| PLFP| Fee payment|Year of fee payment: 6 |
    2021-09-13| PLFP| Fee payment|Year of fee payment: 7 |
    优先权:
    申请号 | 申请日 | 专利标题
    JP2014206953|2014-10-08|
    JP2014206953|2014-10-08|
    JP2015050365|2015-03-13|
    JP2015050365|2015-03-13|
    JP2015155908A|JP6723702B2|2014-10-08|2015-08-06|Vehicle lighting|
    JP2015155908|2015-08-06|
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