• 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 vehicle lamp has a plurality of organic electroluminescence elements (10), and a flexible printed circuit board (30) to which the plurality of organic electroluminescence elements (10) are connected, the circuit board flexible printed circuit (30) having lines through which each of the organic electroluminescence elements (10) is independently powered with electrical energy.
    公开号:FR3038965A1
    申请号:FR1656768
    申请日:2016-07-13
    公开日:2017-01-20
    发明作者:Haruhiko Iyoda
    申请人:Koito Manufacturing Co Ltd；
    IPC主号:
    专利说明:

    BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a vehicle lamp and more particularly to a vehicle lamp used in a vehicle such as an automobile. 2. Background Art [0002] Japanese Patent Application Publication No. 2015-65150 (JP 2015-65150 A) discloses a vehicle lamp in which an organic electroluminescence element (organic EL element) is used as a as a source of light.
    The inventor has considered mounting a plurality of organic EL elements in the vehicle lamp described above and to light each of them independently. In this case, the number of supply wires increases and accordingly this leads to an increase in the dimensions of the vehicle lamp.
    SUMMARY OF THE INVENTION
    The present invention provides a technology that eliminates the increase in dimensions of a vehicle lamp including a plurality of organic electroluminescence elements.
    An aspect of the present invention relates to a vehicle lamp. This vehicle lamp comprises a plurality of organic electroluminescence elements; and a flexible printed circuit board to which elements of the plurality of organic electroluminescence elements are connected, the flexible printed circuit board having lines through which each of the organic electroluminescence elements is independently powered with power. electric energy. According to this aspect, it is possible to suppress the increase in dimensions of the vehicle lamp.
    According to the aspect described above, at least two elements of the plurality of organic electroluminescence elements may be arranged such that the light emitting surfaces of adjacent organic electroluminescence elements among the at least two Organic electroluminescence elements are not parallel to each other. According to this structure, the visibility of the vehicle lamp can be improved. On the other hand, the vehicle lamp according to the aspect described above may include at least one pair of translucent elements, wherein at least one of the plurality of organic electroluminescence elements may be interposed sandwiched between them. elements of each pair of the at least one pair of translucent elements; and at least one element of each pair of the at least one pair of translucent elements may have a curved portion provided on a light-traversing surface from the at least one organic electroluminescence element. According to this structure, the visibility of the vehicle lamp can be improved. On the other hand, according to the aspect described above, each of the plurality of organic electroluminescent elements may have a first light emitting surface and a second light emitting surface having a luminance lower than that the first light emitting surface; and at least two of the plurality of organic electroluminescent elements may be arranged such that the second light emitting surfaces are rotated toward each other. According to this structure, the luminance of the vehicle lamp can be maintained, without taking into account the organic coated electroluminescence elements which are lit.
    According to the aspect described above of the present invention, it is possible to reduce dimensions of the vehicle lamp including the plurality of organic electroluminescence elements.
    BRIEF DESCRIPTION OF THE DRAWINGS The invention will be better 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.
    The features, advantages and technical and industrial interest of the exemplary embodiments of the invention will be described below with reference to the accompanying drawings, in which like reference numerals represent like elements, and in which: FIG. 1A is a perspective view of the external appearance of a vehicle lamp according to an exemplary embodiment of the invention; Fig. 1B is a sectional view through line IB-IB of Fig. 1A; Fig. 2 is a perspective view of the internal structure of the vehicle lamp according to the exemplary embodiment; Fig. 3 is a sectional view schematically showing the structure of an organic EL element; Fig. 4 is a plan view schematically showing the structure of the organic EL elements and a flexible printed circuit board; Fig. 5 is an enlarged view of a half of the flexible printed circuit board, which is positioned inside in the width direction of the vehicle; Fig. 6 is an enlarged view of one half of the flexible printed circuit board which is positioned outside in the width direction of the vehicle; Fig. 7A is an enlarged view of a region A surrounded by a dashed line in Fig. 6; Fig. 7B is an enlarged view of a region B surrounded by a dashed line in Fig. 6; Figure 8A is a schematic view illustrating mounting postures of organic EL elements; Figure 8B is a schematic view illustrating mounting postures of organic EL elements; Figure 8C is a schematic view illustrating mounting postures of organic EL elements; Fig. 9A is a schematic view illustrating a structure for securing the organic EL element; Fig. 9B is a view illustrating another structure for securing the organic EL element; Fig. 9C is a sectional view through line IXC-IXC of Fig. 9B; Fig. 10A is a schematic view illustrating a covering arrangement of the organic EL elements according to a comparative example; and Fig. 10B is a schematic view illustrating a covering arrangement of the organic EL elements according to the exemplary embodiment.
    DETAILED DESCRIPTION OF EMBODIMENTS
    An exemplary embodiment of the invention will be described with reference to the accompanying drawings. Identical or equivalent elements, components and processes shown in the drawings shall be indicated by the same reference numerals and redundant descriptions shall be omitted as appropriate. On the other hand, the exemplary embodiment is only an example and is not intended to limit the invention.
    FIG. 1A is a perspective view of the external appearance of a vehicle lamp according to the exemplary embodiment. Fig. 1B is a sectional view through the line IB-IB of Fig. 1A. Fig. 2 is a perspective view of the internal structure of the vehicle lamp according to the exemplary embodiment. The internal structure of the vehicle lamp is normally visible from the outside because the translucent cover is substantially transparent. However, in FIG. 1A, the internal structure is omitted for the sake of simplicity to clarify the external appearance and shape of the vehicle lamp.
    A vehicle lamp 1 according to this exemplary embodiment has a shape that is long in the direction of the width of the vehicle and short in the vertical direction, for example. The vehicle lamp 1 comprises a lamp body 2 and a translucent cover 4 which is attached to the lamp front side of the lamp body 2. The translucent cover 4 is made of resin or glass or the like, having some translucency. The lamp body 2 and the translucent cover 4 form a lamp chamber 3. A plurality of organic electroluminescence elements (organic EL elements) 10, a flexible printed circuit board 30 and a plurality of optical fibers 50 are arranged at the same time. The flexible circuit board 30 is attached to a circuit board mounting surface 2a of the lamp body 2. The elements of the plurality of organic EL elements 10 are connected to the card. flexible elements 30 and fixed to the lamp body 2. The elements of the plurality of organic EL elements 10 are arranged in the direction of the width of the vehicle.
    The lamp body 2 is made of a material with high thermal conductivity such as aluminum, for example. The organic EL elements 10 and the flexible printed circuit board 30 are glued to the lamp body 2 by means of a thermally conductive adhesive or the like. As a result, the heat generated by the organic EL elements 10 is transferred to the lamp body 2, either directly or via the flexible printed circuit board 30.
    The postures of the plurality of optical fibers 50 are fixed so as to extend in the direction of the width of the vehicle and the fibers of the plurality of optical fibers 50 are attached to a surface of the translucent cover 4 which is rotated. the side of the lamp body 2. The fibers of the plurality of optical fibers 50 extend in parallel with each other and are arranged in the vertical direction (up-down direction) of the vehicle lamp 1 at least in the central part, in the direction of the vehicle width, the vehicle lamp 1. An end portion 52 and the other end portion 54 of the plurality of optical fibers 50 are grouped together and routed to the rear side of the vehicle. the lamp. A light source, not shown, is disposed near the end portion 52, and the light from the light source enters the optical fibers 50 from the end portion 52 and is emitted by the end portion 54. A light source may be arranged near the end portion 54 instead of being near the end portion 52, or light sources may be arranged both near the end portion 52 and near the end portion 54. The optical fibers 50 are configured so that the light leaks outwardly through their side surface. Since a portion of the incident light leaks outwardly through the side surfaces of the optical fibers 50, the optical fibers 50 are visually recognized from the outside as light-emitting portions.
    The structures of the organic EL elements 10 and the flexible printed circuit board 30 will then be described in detail. FIG. 3 is a sectional view schematically showing the structure of the organic EL elements 10. FIG. 4 is a plan view schematically showing the structure of the organic EL elements 10 and a flexible printed circuit board 30. FIG. 5 is an enlarged view of one half of the flexible printed circuit board 30, which is positioned inside in the width direction of the vehicle. Fig. 6 is an enlarged view of one half of the flexible printed circuit board 30 which is positioned outside in the width direction of the vehicle. Fig. 7A is an enlarged view of a region A surrounded by a dashed line in Fig. 6, and Fig. 7B is an enlarged view of a region B surrounded by a dashed line in Fig. 6.
    Each of the organic EL elements 10 is a known organic EL element such as an organic light-emitting diode (OLED) and comprises a structure in which a light-emitting portion 16 is interposed sandwiched between a first glass substrate. surface 12 and a second surface glass substrate 14. An adhesive layer 20 is provided on a side surface of the light emitting part 16, i.e. a surface which connects a surface in contact with the first surface glass substrate 12 at a surface in contact with the second surface glass substrate 14. Accordingly, the light emitting portion 16 is sealed by means of the first surface glass substrate 12, the second glass substrate The light-emitting portion 16 has a structure in which an anode layer, an organic light-emitting layer and a cathode layer and the like are interfered with. together. The anode layer and the cathode layer are each formed of a transparent conductive film such as an indium tin oxide film (ΓΤΟ). The organic EL element 10 is substantially transparent, with a light transmission rate of approximately 40% or more at a wavelength of 380 to 780 nm for example.
    Each element of the plurality of organic EL elements 10 comprises a first light emitting surface 18a and a second light emitting surface 18b having a luminance lower than that of the first light emitting surface 18a. . The first light emitting surface 18a is positioned in the first surface glass substrate 12 and the second light emitting surface 18b is positioned in the second surface glass substrate 14. That is, the organic EL element 10 emits more light from the side of the first surface glass substrate 12 than from the side of the second surface glass substrate 14. The ratio of the luminance of the first light emitting surface 18a to the luminance of the second light emitting surface 18b is approximately 6: 4, for example.
    The flexible printed circuit board 30 is made of a transparent material that is flexible and has insulation properties, such as polyimide. The flexible printed circuit board 30 has a light transmission rate greater than or equal to 80% at a wavelength of 380 to 780 nm, for example. The flexible printed circuit board 30 has a base portion 32 and a plurality of element connection portions 34.
    The base portion 32 has a substantially web-like shape and extends in the direction of the width of the vehicle. The base portion 32 is divided in two substantially at the center in the width direction of the vehicle. That is, the base portion 32 has an inner base portion 32a which is positioned inward in the width direction of the vehicle and an outer base portion 32b which is positioned externally in the the direction of the width of the vehicle. A connector adjusting portion 36a is provided on an end portion in the interior of the vehicle width direction of the inner base portion 32a. On the other hand, a connector adjusting portion 36b is provided on an outer end portion in the width direction of the vehicle, of the outer base portion 32b. The base portion 32 may also include a single piece from the first end side to the other end side in the width direction of the vehicle.
    The portions of the plurality of element connecting portions 34 are arranged in the extension direction of the base portion 32, and each is connected to the base portion 32. Each of the connecting portions of elements 34 is substantially L-shaped and has a first portion 34a that extends branching from the base portion 32 and a second portion 34b that extends substantially parallel to the extension direction of the portion base 32, from the end portion of the first portion 34a on the opposite side from the base portion 32. A range 38, to which is electrically connected the organic EL element 10 is provided on the second portion 34b . The connector adjustment portions 36a and 36b and the pad 38 each have a structure in which a gold plated layer is provided on a surface of conductive material such as a copper foil, for example.
    The flexible printed circuit board 30 includes lines (tracks) 40 through which each of the organic EL elements 10 is independently powered with electrical energy. The lines 40 are made of a conductive material such as a copper foil. The lines 40 corresponding to each of the organic EL elements 10 extend along the surface of the base portion 32 of the connector adjustment portion 36a or 36b to the element connection portion 34. When the lines 40 reach the element connecting part 34 to which the corresponding organic EL element 10 is connected, the lines 40 are then connected to the track 38 via the first part 34a and the second part 34b of the part of Element connection 34. The lines 40 extending from the connector adjustment portion 36a are connected to the pads 38 provided on the inner base portion 32a. The lines 40 extending from the connector adjustment portion 36b are connected to the pads 38 provided on the outer base portion 32b.
    Electrodes, not shown, organic EL elements 10, are electrically connected to the pads 38 of the element connection portions 34. Accordingly, each element of the plurality of organic EL elements 10 is independently connected to a power supply. . In this exemplary embodiment, all organic EL elements 10 are each independently connected to the power supply, but the invention is not limited to this configuration. For example, some of the organic EL elements 10 may be connected in series or in parallel with each other with the power supply.
    The mounting postures of the organic EL elements 10 mounted on the lamp body 2 will then be described. Figs. 8A to 8C are schematic views illustrating mounting postures of the organic EL elements 10. The flexible printed circuit board 30 is flexible. As a result, the flexible printed circuit board 30 is able to easily deform to match the shape of the circuit board mounting surface 2a of the lamp body 2. On the other hand, each of the element connection parts 34 to which are connected the organic EL elements 10 comprises the first narrow band-shaped portion 34a which extends branching from the base portion 32. Accordingly, the positions (orientations) of the light-emitting surfaces Organic EL elements 10 can be easily modified.
    Accordingly, as shown in Fig. 8A, at least some (at least two) of the plurality of organic EL elements 10 may be arranged such that the light emitting surfaces 18 of the organic EL elements 10 among the at least two organic EL elements 10 are not parallel to each other. That is, at least some (at least two) of the plurality of organic EL elements 10 can be arranged such that at least a portion of the first light emitting surface 18a of an organic EL element 10 is not included in a plane which has the first light emitting surface 18a of another organic EL element 10. As an example of such an arrangement, the elements of the plurality of Organic EL elements 10 are arranged such that normal lines N of the light-emitting surfaces 18 of adjacent organic EL elements 10 intersect, as shown in FIG. 8B. In addition, at least some of the plurality of organic EL elements 10 are arranged such that the normal lines N intersect at a point. That is, at least some of the plurality of organic EL elements 10 are arranged to form a substantially curved surface.
    On the other hand, as another exemplary arrangement of the plurality of organic EL elements 10, at least some of the plurality of organic EL elements 10 are arranged in postures (positions) having rotated around the normal lines N from a state in which two sides of the rectangular organic EL elements 10 extend horizontally and the other two sides extend in the vertical direction, as shown in FIG. 8C . That is, at least some of the plurality of organic EL elements 10 are arranged such that the contour of the upper sides or lower sides of the group of organic EL elements arranged (dashed lines on the Figure 8C) is a staggered form.
    The structure for fixing the organic EL elements 10 will then be described. Figs. 9A-9C are schematic views illustrating structures for securing organic EL elements 10. Fig. 9A is a sectional view of an exemplary structure for attaching organic EL elements 10. Fig. 9B is a front view another example of a structure for fixing the organic EL elements 10 and FIG. 9C is a sectional view through the line IXC-IXC of FIG. 9B.
    As shown in FIG. 9A, the vehicle lamp 1 according to this exemplary embodiment comprises at least one pair of translucent elements 70a and 70b and at least one organic EL element 10 is interposed sandwiched between the elements of FIG. each pair of the at least one pair of translucent elements 70a and 70b. Each pair of translucent elements 70a and 70b serves as a structure for attaching the at least one organic EL element 10. The translucent elements 70a and 70b are made of a transparent resin material, for example acrylic or polycarbonate. The translucent elements 70a and 70b have a light transmission rate greater than or equal to 85% at a wavelength of 380 to 780 nm, for example. When the translucent elements 70a and 70b are made of acrylic resin, the light transmission rate in the wavelength range described above is approximately 94%. When the translucent elements 70a and 70b are made of polycarbonate resin, the light transmission rate in the wavelength range described above is approximately 88%. The translucent element 70a is arranged on the side of the first surface glass substrate 12 of the organic EL element 10. The translucent element 70b is arranged on the side of the second surface glass substrate 14 of the organic EL element. 10.
    The translucent element 70a has a recessed portion 72a in a position corresponding to the organic EL element 10. The translucent element 70b has a recessed portion 72b in a position corresponding to the organic EL element 10. L organic EL element 10 is housed in a space formed by the recessed portion 72a and the recessed portion 72b when the translucent member 70a and the translucent member 70b are superimposed (i.e. the translucent member 70a and the translucent element 70b are fitted to each other). The organic EL element 10 may be arranged so that the first light emitting surface 18a is in close contact with the lower surface of the recessed portion 72a and the second light emitting surface 18b is in close contact with the lower surface of the recessed portion 72b, or a space may be provided between the light emitting surface and the lower surface and a transparent adhesive or the like may fill this space.
    The translucent elements 70a and 70b may each comprise a curved portion on a surface through which the light comes from the organic EL element 10. The translucent element 70a arranged on the side of the first surface glass substrate 12 may comprise for example a curved portion 74, as shown in Figures 9B and 9C. More specifically, the curved portion 74 is provided on a surface of the recessed portion 72a of the translucent member 70a facing the first surface glass substrate 12, i.e., on the lower surface of the recessed part 72a. The curved portion refers to a boundary portion of two flat surfaces or curved surfaces that are inclined in different directions, for example. The curved portion is a valley line area or a ridge line area, for example. On the other hand, the curved portion is a curved surface having a radius of curvature less than that of two flat surfaces or curved surfaces that form the curved portion for example.
    The curved portion 74 may be provided on the outer surface of the translucent member 70a, i.e., a surface which faces the opposite side with respect to the translucent member 70b. On the other hand, the curved portion 74 may be provided on the translucent element 70b. On the other hand, a pair of translucent elements 70a and 70b may be provided for each organic EL element 10 or some (a plurality) or all of the organic EL elements 10 may be attached by the same translucent elements 70a and 70b. In addition, the flexible printed circuit board 30 can be fixed and sandwiched between the translucent elements 70a and 70b.
    The covering arrangement of the organic EL elements 10 will then be described. Figs. 10A and 10B are schematic views illustrating layering arrangements of organic EL elements 10, Fig. 10A showing a cover arrangement according to a comparative example, and Fig. 10B showing a cover arrangement according to the exemplary embodiment. .
    As described above, the flexible printed circuit board 30 can be easily deformed. Accordingly, the elements of the plurality of organic EL elements 10 may be arranged such that the first light emitting surfaces 18a of the plurality of organic EL elements 10 are superimposed, seen from the front of the lamp. When for example two of the organic EL elements 10 are superimposed, a lamp serving as a rear light and a flashing light may be made by providing an organic EL element 10a as a red light emitting element and providing the other EL element. organic 10b as an element emitting amber light. That is, the vehicle lamp 1 can be used as a plurality of lamp types.
    When two of the organic EL elements 10 are superimposed, it is conceivable that the organic EL element 10a and the organic EL element 10b are arranged so that the first surface glass substrate 12 of each of the organic EL elements 10a and 10b is facing the front side of the lamp, as shown in FIG. 10A. That is, the organic EL elements 10a and 10b can be arranged such that the second light emitting surface 18b of the organic EL element 10a and the first light emitting surface 18a of the organic EL element 10b are rotated towards each other.
    As described above, the first light emitting surface 18a of the organic EL element 10 has a luminance greater than that of the second light emitting surface 18b of the organic EL element 10. Accordingly, red light R is mainly emitted towards the front of the lamp from the first light emitting surface 18a of the organic EL element 10a. Amber light U is mainly emitted towards the front of the lamp from the first light emitting surface 18a of the organic EL element 10b. Since there is no other organic EL element 10 in front of the organic EL element 10a in the lamp, the red light R emitted by the first light emitting surface 18a can be emitted towards the front of the lamp. lamp without decreasing its luminance.
    On the other hand, the organic EL element 10a is in front of the organic EL element 10b in the lamp. As a result, the amber light U emitted by the first light emitting surface 18a of the organic EL element 10b is emitted towards the front of the lamp after passing through the organic EL element 10a. Thus, the amber light U eventually fade before being emitted towards the front of the lamp. Accordingly, with the overlap arrangement shown in FIG. 10A, the vehicle lamp appears bright when the red light R is emitted, but the vehicle lamp appears dark when the amber light U is emitted.
    In contrast, with the exemplary embodiment, the organic EL element 10a and the organic EL element 10b are arranged so that their second light emitting surfaces 18b are rotated towards one another. other, as shown in Figure 10B. That is, at least two of the plurality of organic EL elements 10 are arranged such that the second light-emitting surfaces 18b are rotated towards each other. With this arrangement, the red light R emitted by the first light emitting surface 18a of the organic EL element 10a is emitted towards the front of the lamp without passing through the other organic EL element 10. On the other hand, the amber light U emitted by the first light emitting surface 18a of the organic EL element 10b is emitted towards the rear side of the lamp without passing through the other organic EL element 10.
    By arranging a reflector 80 on the rear side of the lamp of the organic EL element 10b (that is to say, by arranging the reflector 80 behind the organic EL element 10b in the lamp), the amber light U emitted by the first light emitting surface 18a can be reflected towards the front side of the lamp. As a result, the amber light U emitted by the first light emitting surface 18a can be emitted towards the front of the lamp without passing through the other organic EL element 10. As a result, the vehicle lamp 1 appears bright on the times when the red light R is emitted and when the amber light U is emitted.
    It is the same when the organic EL element 10a is an element that emits amber light and the organic EL element 10b is an element that emits red light. On the other hand, with the covering arrangement of the organic EL elements 10 shown in Fig. 10A, when the reflector 80 and arranged on the rear side of the lamp of the organic EL element 10b, the amber light U reflected back to the The front of the lamp by the reflector 80 is light of a low luminance which is emitted by the second light emitting surface 18b. Accordingly, with the covering arrangement shown in Fig. 10A, the amber light U eventually appears darker than the red light R, even though the reflector 80 is provided.
    In addition, even with a configuration in which the red light R is emitted to one side of the vehicle lamp 1 and the amber light U is emitted to the opposite side of the vehicle lamp 1, instead of one configuration in which the red light R and the amber light U are both emitted in the same direction, the covering arrangement of this exemplary embodiment both ensures the luminance of the red light and the luminance of the amber light U.
    In the vehicle lamp 1 according to this exemplary embodiment, it is possible to sequentially ignite the plurality of organic EL elements 10 and to extinguish in sequence the plurality of organic EL elements 10. C ' that is, in the vehicle lamp 1, the elements of the plurality of organic EL elements 10 can be turned on or off in sequence one by one, or groups of successive organic EL elements 10 can be switched on or off in sequence one group after another. Alternatively, it is possible to switch on or off in sequence the plurality of organic EL elements 10 one by one in combination with the sequential switching on or off of successive organic EL groups 10 , one group after another. For example, in the vehicle lamp 1, it is possible to sequentially illuminate the organic EL elements 10 in the order of the interior in the direction of the vehicle width outward in the width direction of the vehicle. vehicle, or in the opposite direction.
    On the other hand, in the vehicle lamp 1, it is possible to light the plurality of optical fibers 50 in sequence and to extinguish in sequence the plurality of optical fibers 50. That is to say that in the vehicle lamp 1, the fibers of the plurality of optical fibers 50 may be turned on or off in sequence, one or more groups of successive optical fibers 50 may be switched on or off sequentially one group after another. Alternatively, it is possible to switch on or off in sequence the fibers of the plurality of optical fibers 50 one by one in combination with the sequential switching on or off of successive fiber optic groups, one group after the other. 'other. For example, in the vehicle lamp 1, it is possible to light the optical fibers 50 sequentially in order from the optical fiber 50 located in the low position of the lamp in the center in the direction of the width of the vehicle In addition, in the vehicle lamp 1, it is possible to sequentially light the elements of the plurality of organic EL elements 10 and to switch off in sequence the elements of the plurality of elements. Organic EL 10, in combination with the sequential ignition of the plurality of optical fibers 50 and the sequential extinction of the plurality of optical fibers 50. On the other hand, the brightness of the optical fibers 50 can be modified by changing the value of the current delivered to the light source arranged near the end portion 52 and / or the end portion 54.
    The vehicle lamp 1 according to this exemplary embodiment can be used as a clearance light such as a flashing light, a daytime running light or a position light, or as a headlight, taillight or brake light, for example.
    As described above, the vehicle lamp 1 according to this exemplary embodiment comprises the plurality of organic EL elements 10 and the flexible printed circuit board 30 to which the elements of the plurality of elements are connected. Organic EL 10, the flexible printed circuit board 30 having the lines 40 through which each of the organic EL elements 10 is independently powered with electrical energy. It is necessary to provide lines for each of the organic EL elements 10 to individually emit light by each of the plurality of organic EL elements 10. As a result, the number of lines may increase, which may lead to increased dimensions of the vehicle lamp. On the other hand, the vehicle lamp 1 according to this exemplary embodiment comprises the flexible printed circuit board 30 with the patterned lines 40. With the flexible printed circuit board 30, each of the lines 40 can be made thin. It is therefore possible to suppress the increase of the dimensions of the vehicle lamp 1.
    On the other hand, the organic EL elements 10 and the flexible printed circuit board 30 are substantially transparent. In addition, each of the lines 40 is thin and thus, is not easily recognized visually from the outside. As a result, the appearance or design of the vehicle lamp 1 can be improved. On the other hand, the lines 40 are printed on the flexible printed circuit board 30, which avoids a situation in which the interior of the lamp becomes congested due to multiple lines. As a result, the manufacturing process of the vehicle lamp 1 can be simplified, and the working efficiency (manufacturing efficiency) can be improved. On the other hand, the flexible printed circuit board 30 is flexible. As a result, the degree of freedom (flexibility) of the design of the vehicle lamp 1 can be improved.
    In addition, in the vehicle lamp 1 according to this exemplary embodiment, at least some (at least two) elements of the plurality of organic EL elements 10 are arranged so that the light emitting surfaces adjacent organic EL elements among the at least two organic EL elements 10 are not parallel to each other. As described above, the flexible printed circuit board 30 is flexible. As a result, the postures of the organic EL elements 10 can be easily modified. Accordingly, the elements of the plurality of organic EL elements 10 can be arranged three-dimensionally. As a result, the visibility or design of the vehicle lamp 1 can be improved.
    On the other hand, the vehicle lamp 1 comprises the pair of translucent elements 70a and 70b sandwiching the organic EL element 10. The organic EL element 10 is fixed by being sandwiched between the elements of the pair of translucent elements 70a and 70b. As a result, the organic EL element 10 can be stably maintained. On the other hand, at least one element of the pair of translucent elements 70a and 70b has the curved portion 74 on a surface traversed by the light from the organic EL element 10. That is, at the at least one of the translucent elements 70a and 70b includes a step-like surface. As a result, the light-emitting portion of the vehicle lamp 1 appears three-dimensional. Thus, the visibility or the design of the vehicle lamp 1 can be improved.
    On the other hand, in the vehicle lamp 1, each element of the plurality of organic EL elements 10 has the first relatively luminance light emitting surface 18a and the second light emitting surface 18b. relatively low luminance. On the other hand, at least two of the plurality of organic EL elements 10 are arranged so that the second light emitting surfaces 18b are facing each other. The dimensions of the vehicle lamp 1 can be reduced or the number of organic EL elements 10 that are provided can be increased by superimposing the elements of the plurality of organic EL elements 10.
    In addition, by arranging the second light-emitting surfaces 18b of the organic EL elements 10 so that they are rotated towards each other, in a laminated body consisting of two organic EL elements 10, the first light emitting surfaces 18a of the two organic EL elements 10 are facing outwardly of the laminate body. As a result, the luminance of the vehicle lamp 1 can be maintained, regardless of which of the organic EL elements 10 is caused to emit light. Even in a structure in which two of the organic EL elements 10 are superimposed to be rotated in the same direction, the luminance of the vehicle lamp 1 can be maintained by increasing the current delivered to the organic EL element 10 with the first surface of the vehicle. light emission 18a which is turned towards the interior of the laminated body. However, in this case, the life of the organic EL element 10 at which increased current is delivered will eventually be shorter. On the other hand, with this exemplary embodiment, the decrease in the life of the organic EL element 10 can be avoided.
    On the other hand, since the thin organic EL elements 10 are superimposed, the elements of the plurality of organic EL elements 10 appear as a single light emitting portion. Further, when the plurality of organic EL elements 10 are sandwiched between the elements of the pair of translucent elements 70a and 70b, the plurality of organic EL elements 10 tend to look even more similar. to a single light emission part. On the other hand, when the colors of the light emitted by the superposed organic EL elements are rendered different, the light emitted by the superposed organic EL elements 10 resembles the light of a plurality of colors emitted by a source of emission of unique light. As a result, the design of the vehicle lamp 1 can be improved. Although it is possible to emit light of a plurality of colors with a single organic EL element 10, in this case the structure of the organic EL element 10 would be complex and the cost of the organic EL element 10 would also increase. On the other hand, with this exemplary embodiment, it is possible to reduce the complexity and the cost of the structure of the organic EL element 10.
    The invention is not limited to the exemplary embodiment described above. On the contrary, various modifications such as design changes can also be added based on knowledge of a person skilled in the art and exemplary embodiments to which such modifications have been added are also included in the scope of the art. invention. The exemplary embodiments resulting from modifications to the exemplary embodiment described above have the effects of both the exemplary embodiment combined with the modifications.
    权利要求:
    Claims (4)
    [1" id="c-fr-0001]
    A vehicle lamp characterized in that it comprises: a plurality of organic electroluminescence elements (10); and a flexible printed circuit board (30) to which elements of the plurality of organic electroluminescence elements (10) are connected, the flexible printed circuit board (30) having lines (40) through which each organic electroluminescence elements (10) are independently powered with electrical energy.
    [2" id="c-fr-0002]
    The vehicle lamp according to claim 1, wherein at least two of the plurality of organic electroluminescence elements (10) are arranged such that the light emitting surfaces of adjacent organic electroluminescence elements (10). at least two organic electroluminescence elements (10) are not parallel to one another.
    [3" id="c-fr-0003]
    Vehicle lamp according to claim 1 or 2, characterized in that it further comprises at least one pair of translucent elements (70a, 70b), wherein at least one of the plurality of organic electroluminescence elements (10) is sandwiched between the elements of each pair of the at least one pair of translucent elements (70a, 70b); and at least one member of each pair of the at least one pair of translucent elements (70a, 70b) has a curved portion (74) provided on a surface traversed by the light from the at least one organic electroluminescence element (10).
    [4" id="c-fr-0004]
    The vehicle lamp according to any of claims 1 to 3, wherein each of the plurality of organic electroluminescence elements (10) has a first light emitting surface (18a) and a second light emitting surface (18a). light emission (18b) having a luminance lower than that of the first light emitting surface (18a); and at least two of the plurality of organic electroluminescence elements (10) are arranged such that the second light emitting surfaces (18b) are facing each other.
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    同族专利:
    公开号 | 公开日
    FR3038965B1|2020-10-23|
    JP2017027661A|2017-02-02|
    CN106352286A|2017-01-25|
    JP6546024B2|2019-07-17|
    DE102016212889A1|2017-01-19|
    US10132461B2|2018-11-20|
    US20170016587A1|2017-01-19|
    CN106352286B|2019-06-18|
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    法律状态:
    2017-06-02| PLSC| Search report ready|Effective date: 20170602 |
    2017-06-13| PLFP| Fee payment|Year of fee payment: 2 |
    2018-06-12| PLFP| Fee payment|Year of fee payment: 3 |
    2019-06-19| PLFP| Fee payment|Year of fee payment: 4 |
    2020-06-11| PLFP| Fee payment|Year of fee payment: 5 |
    2021-06-11| PLFP| Fee payment|Year of fee payment: 6 |
    优先权:
    申请号 | 申请日 | 专利标题
    JP2015141545A|JP6546024B2|2015-07-15|2015-07-15|Vehicle lamp|
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