JP2005174584A - Vehicular high mount stop lamp - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicular high mount stop lamp in which a longitudinal light emitting state is homogeneous. <P>SOLUTION: This is a vehicular high mount stop lamp in which a lengthy light emitting body having a cylindrical lens 13 at one side face of the lengthy light guide body 12 such as an acrylic resin-made, and a light emitting diode 11 which becomes a light source arranged at one end face of the light emitting body are combined. The light guided from the one end part of the lengthy light guide goes through the lengthy light guide body and is emitted from the cylindrical lens. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a high mount stop lamp for a vehicle.

  As a high-mount stop lamp attached to the rear part of an automobile, a plurality of light-emitting diodes (LED lamps) as light sources are known. However, since such a technique requires a large number of LED lamps, there are problems such as an increase in power consumption, and there are also problems in appearance due to the discontinuous collection of point light sources.

Although the invention of Patent Document 1 has been proposed as a technique for solving such a problem, the basic required performance when applied to a vehicle is reduced in weight and thickness, and further when mounted in a narrow space in the vehicle. There is room for improvement in terms of mounting workability.
JP 2003-197008 A

  An object of the present invention is to provide a high-mount stop lamp for a vehicle that is lightweight and can be reduced in size (thinned) and has good mounting workability.

As a means for solving the problem, the invention of claim 1 is a light emitting diode as a light source, and a long light that guides light in the longitudinal direction and emits the guided light in a direction perpendicular to the longitudinal direction. It is a high-mount stop lamp for vehicles combined with a light emitter,
The long light emitter has a long light guide and a light emitting portion provided continuously and integrally in the longitudinal direction of one side of the light guide,
Provided is a high-mount stop lamp for a vehicle in which light guided from at least one end of a long light guide passes through the long light guide and is emitted from a light emitting part.

  According to the present invention, light can be emitted linearly in a continuous state in the longitudinal direction by guiding light from at least one end of a long light guide with one light source, so that power consumption is reduced. In addition, it looks better than a plurality of light sources arranged in parallel.

  According to a second aspect of the present invention, there is provided the high mount stop lamp for a vehicle according to the first aspect, wherein the cross-sectional area in the width direction of the long light guide becomes smaller as the distance from the light source is increased.

  The closer to the light source, the higher the illuminance of incident light, and the farther away, the lower the illuminance of incident light. Therefore, by making the cross-sectional area in the width direction of the long light guide smaller as it is farther from the light source, it becomes easier to enter the light into the light emitting portion, so that it is possible to suppress a decrease in emitted light, The light emission state in the direction can be made uniform.

The degree of change in cross-sectional area, the minimum cross-sectional area and _{X 1,} the maximum cross-sectional area when the _{X 2, X 2} / _{X 1} is preferably 1.001 to 100, more preferably 1.01 to 10 is there. The cross-sectional area in the width direction of the elongate light guide includes not only the case where one end side is maximum and the other end side is minimum, but also the case where both end sides are maximum and the center portion is minimum.

  According to a third aspect of the present invention, in the high mount stop lamp for a vehicle according to the first or second aspect, the width of the boundary portion between the elongated light guide and the light emitting portion increases as the distance from the light source increases. provide.

  From the viewpoint opposite to that of the second aspect of the present invention, the emission light at a position far from the light source is prevented from being lowered, and the light emission state in the longitudinal direction is made uniform. That is, as the distance from the light source increases, the width of the boundary portion between the elongated light guide and the light emitting portion is increased, thereby suppressing the incidence of light to the light emitting portion closer to the light source and being far from the light source. This increases the incidence of incident light on the light emitting part.

The degree of change in the width of the boundary portion is preferably set such that Y ₂ / Y ₁ is preferably 1.01 to 100, more preferably Y ₁ when the minimum width is Y ₁ and the maximum width is Y _2. 1.05-50.

  According to a fourth aspect of the present invention, in the high mount stop lamp for a vehicle according to any one of the first to third aspects, the light is diffused to all or a part of the side surface facing the light emitting portion of the elongated light guide. Or a device having a reflective region.

  By providing a region for diffusing or reflecting the light, the light incident on the elongated light guide can be more effectively diffused or reflected, so that the amount of light entering the light emitting portion is increased. Thus, the illuminance of the emitted light can be increased. Such a region can be provided on other side surfaces where no light emitting part is provided and on end surfaces where no light source is provided, if necessary.

  According to a fifth aspect of the present invention, in the high-mount stop lamp for a vehicle according to any one of the first to third aspects, a region for diffusing or reflecting light is provided at a portion facing the light emitting surface of the light emitting portion. Provide what you have.

  The present invention achieves the same effect by means different from that of the invention of claim 4, but by such means, the illuminance of the emitted light can be further increased than that of the invention of claim 4.

  According to a sixth aspect of the present invention, there is provided the high mount stop lamp for a vehicle according to the fourth or fifth aspect, wherein the light diffusing or reflecting region is a rough surface or a light-reflective coating surface.

  The rough surface can be a surface having a regular or irregular corrugation, a surface having regular or irregular irregularities, preferably a serrated surface, or the like. In addition, when it is set as the application surface of a light-reflective coating material, since an application surface itself becomes a surface which has an unevenness | corrugation substantially, it is more effective. In the case of a sawtooth surface, the reflectance (the ratio of reflected light to the total amount of light colliding with the sawtooth surface, preferably 100%) is adjusted by adjusting the angle of the teeth.

  According to a seventh aspect of the present invention, in the high-mount stop lamp for a vehicle according to any one of the first to sixth aspects, the light emitting diode as the light source and the elongated light emitter are on the same line, and the light emitting diode and the automobile power source are further provided. The lead wire connecting direction is provided on the same line.

  For parts to be mounted on automobiles, downsizing and weight reduction (thinning) are indispensable issues, and since they are mounted in a narrow mounting space in the vehicle, they are required to have good mounting workability. The vehicle-mounted high-mount stop lamp of the present invention can be thin and elongated as a whole including the light source (for example, the maximum thickness is about 1 to 50 mm, and the length is about 100 to 500 mm). Since the length direction of the high-mount stop lamp for a vehicle and the lead-out direction of the lead wire are the same and on the same line, the mounting workability is good even in a narrow space regardless of location.

  The high-mount stop lamp for a vehicle of the present invention is small and light (thin), and only one light source is sufficient. Therefore, the power consumption is small, and the mounting workability is good even in a narrow space. Furthermore, the light emission state in the longitudinal direction is uniform, and the appearance is good.

(1) First Embodiment A description will be given with reference to FIG. FIG. 1 is a side view of an embodiment. A high mount stop lamp 10 for a vehicle shown in FIG. 1 is a combination of a light emitting diode 11 serving as a light source and a long light emitter. A white arrow indicates a traveling direction of light.

  The long light emitter has a long light guide 12 and a cylindrical lens 13 that is continuously and integrally provided in the longitudinal direction of one side surface of the light guide 12 and serves as a light emitting portion. doing. The long light-emitting body can be obtained by integral molding using a method such as injection molding using an acrylic resin, a methacrylic resin, or a synthetic resin having the same transparency.

  As shown in the drawing, one light source 11 may be disposed at least at one end of the long light guide 12, but two or more light sources 11 may be disposed, and one light source 11 may be disposed at both ends of the long light guide 12. Individual or two or more may be arranged.

  The cross-sectional area of the elongate light guide 12 in the width direction is set so that the one end surface 12a side is the largest and the other end surface 12b side is the smallest, that is, the smaller the distance from the light source. Is preferred.

The degree of change in cross-sectional area, the cross-sectional area of the one end face 12a and _{X 1,} when the cross-sectional area of the other end face 12b and _{X 2, X 2} / _{X 1} is preferably 1.01 to 10, more preferably is 1.05 to 5, when the cross-sectional area of the intermediate position and _{X 3, X 3} / _{X 1} is preferably 1.005 to 5, more preferably from 1.025 to 2.5.

Note that the cross-sectional area of the one end face 12a can be X ₁ = the cross-sectional area X ₂ of the other end face 12b, and the cross-sectional area at the intermediate position can be X ₃ . In this case, X ₃ / X ₁ (or X ₂ ) is preferably 1.01 to 10, more preferably 1.05 to 5.

  Since the illuminance of the incident light decreases with increasing distance from the light source 11, the emitted light also decreases. Therefore, by adjusting the cross-sectional area in the width direction of the elongated light guide 12 as described above, light can easily enter the cylindrical lens 13 at a position far from the light source 11, and as a result, Since a decrease in emitted light is suppressed, it is preferable because uniformity of light emission in the longitudinal direction can be maintained.

  In addition to or separately from the adjustment of the cross-sectional area in the width direction of the long light guide 12, the width of the boundary portion between the long light guide 12 and the cylindrical lens 13 is adjusted so that the one end face 12a side is It is also possible to set it to be the smallest and the largest at the other end surface 12b side, that is, as the distance from the light source 11 increases.

As for the width of the boundary portion, Y ₂ / Y ₁ is preferably 1.0 to ₁ when the width of the one end face 12a is Y ₁ and the width of the other end face 12b is Y _2. 5.0, more preferably 1.0 to 3.0, and Y ₃ / Y ₁ is preferably 1.0 to 2.5, more preferably when the width of the intermediate position is Y ₃ Is 1.0 to 1.5.

  From the viewpoint opposite to the adjustment of the cross-sectional area in the width direction of the long light guide 12, the light source 11 is adjusted by adjusting the width relationship of the boundary portion between the long light guide 12 and the cylindrical lens 13. Light can easily enter the cylindrical lens 13 at a position far from the center, and as a result, the decrease of the emitted light is suppressed, so that the uniformity of the light emission state in the longitudinal direction can be maintained.

  A region 14 for diffusing or reflecting light is preferably provided on all or part of the side surface of the long light guide 12 facing the cylindrical lens 13. As such a region 14, a rough surface (preferably a sawtooth surface) or a light-reflective coating surface can be applied.

  Incident light from the light source 11 to the elongate light guide 12 is reflected after being reflected many times within the elongate light guide 12 and then enters the cylindrical lens 13, but is emitted to the cylindrical lens 13. It is preferable to have the regions 14 on the opposite side surfaces because light can be easily diffused or reflected so that light can be easily emitted from the cylindrical lens 13. The region 14 can also be provided on the other side surface where the cylindrical lens 13 is not provided and / or the other end surface 12b.

  In the high-mount stop lamp 10 for a vehicle, the light incident on the long light guide 12 from the light source 11 passes through the long light guide 12 and passes from the cylindrical lens 13 to the shaft of the long light guide 12. The light is emitted in a direction orthogonal to the direction. The emitted light is uniformly emitted in the longitudinal direction, thereby serving as a high mount stop lamp.

(2) Second Embodiment A second embodiment will be described with reference to FIGS. FIG. 2 is a side view of another embodiment, and FIGS. 3A and 3B are cross-sectional views taken along line III-III at an arbitrary position in the length direction of FIG. 3A and 3B are cross-sectional views at positions where the length from the light source is different, and FIG. 3A is a cross-sectional view at a position closer to the light source. A white arrow indicates a traveling direction of light.

  A high-mount stop lamp 20 for a vehicle shown in FIG. 2 is a combination of a light emitting diode 21 serving as a light source and a long light emitter.

  The long light emitter has a long light guide 22 and a cylindrical lens 23 as a light emitting portion provided continuously and integrally in the longitudinal direction of one side surface of the light guide 22. doing.

  As shown in the drawing, one light source 21 may be disposed at least at one end of the long light guide 22, but two or more light sources 21 may be disposed, and one light source 21 may be disposed at both ends of the long light guide 22. Individual or two or more may be arranged.

  A groove 25 which is continuous in the longitudinal direction is provided on the side surface of the long light guide 22 facing the cylindrical lens 23, and a region 24 for diffusing or reflecting light is provided on the bottom surface of the groove 25. . As such a region 24, a rough surface (preferably a sawtooth surface) or a light-reflective coating surface can be applied as in the case of FIG. One or two or more grooves 25 can be provided. When there is one groove 25, it is preferably provided at a position shifted from the central portion in the width direction. When there are two or more grooves 25, the grooves 25 are equally spaced in the width direction. It is preferable to provide so that.

  Light incident on the long light guide 22 from the light source 21 is reflected in the long light guide 22 and then emitted after entering the cylindrical lens 23, but the side surface facing the cylindrical lens 23 If the region 24 is provided in the region 24, light is diffused or reflected, so that the light can be easily emitted from the cylindrical lens 23.

  In particular, since this region 24 is provided only on the bottom surface of the groove 25, not on the entire surface, the amount of emitted light on the one end surface 22a side of the light guide 22 closest to the light source 21 is excessively increased. Since the emitted light on the other end face 22b side of the light guide farthest from the light source 21 is prevented from being excessively reduced, the uniformity of the light emission state in the longitudinal direction can be maintained.

  Further, by adjusting the width of the groove 25 so that the one end face 22a side is the narrowest and the other end face 22b side is the widest, it becomes easier to maintain the uniformity of the light emission state in the longitudinal direction.

The size of the groove width, the size of the groove width of the one end face 12a and _{Z 1,} when the size of the groove width of the other end face 12b and _{Z 2, Z 2} / _{Z 1} is preferably 1.01 to 10, more preferably 1.01 to 5, and Z ₃ / Z ₁ is preferably 1.05 to 5 and more preferably 1.05 to 2 when Z ₃ is the groove width at the intermediate position. .5.

  In addition to the bottom surface of the groove 25, the region 24 reduces the loss of incident light as much as possible (that is, reduces the amount of light emitted from other than the cylindrical lens 23 as much as possible), so that as much incident light as possible can reach the cylindrical lens 23. It can be provided on the other surface of the elongated light guide 22 so as to be guided, for example, on the entire surface excluding the boundary portion 26 between the end surface 22a of the elongated light guide 22 and the cylindrical lens 23. A region 24 that diffuses or reflects light can be provided. Furthermore, as a method for obtaining an effect equivalent to such a method, light that is to be emitted from other than the cylindrical lens 23 is absorbed and is not emitted to the outside, and an angle of light that is to be emitted from other than the cylindrical lens 23 It is also possible to apply a method in which the light is not emitted to the outside by changing.

  The width of the boundary portion 26 between the elongated light guide 22 and the cylindrical lens 23 is such that the width is the smallest on the one end face 22a side and the largest on the other end face 22b side, that is, as the distance from the light source 21 increases. Is set to The change in the width relationship at the boundary portion 26 can be set to the same ratio range as in the first embodiment.

  Since the illuminance of incident light decreases as the distance from the light source 21 increases, the illuminance of emitted light also decreases. Therefore, by adjusting the width of the boundary portion 26 as described above, light can easily enter the cylindrical lens 23 at a position far from the light source 21, so that it can be emitted even at a position far from the light source 21. The reduction of the incident light is suppressed, and as a result, the uniformity of the light emission state in the longitudinal direction is maintained.

  The cross-sectional area in the width direction of the elongate light guide 22 is the same as that in FIG. 1 so that the one end face 22a side is the largest and the other end face 22b side is the smallest, that is, far from the light source 21. It is preferable to set it so that it becomes smaller according to the above. The change in the size relationship of the cross-sectional areas in the width direction can be in the same ratio range as in the first embodiment.

  In the vehicle high-mount stop lamp 20, the light incident on the long light guide 22 from the light source 21 passes through the long light guide 22, and from the cylindrical lens 23 to the shaft of the long light guide 22. The light is emitted in a direction orthogonal to the direction. The emitted light is uniformly emitted in the longitudinal direction, thereby serving as a high mount stop lamp.

(3) Third Embodiment A description will be given with reference to FIG. FIG. 4 is a perspective view of a high-mount stop lamp for a vehicle and a cross-sectional view in the width direction at arbitrary three locations. A white arrow indicates a traveling direction of light.

  The high mount stop lamp 30 for a vehicle shown in FIG. 4 is a combination of a light emitting diode 31 serving as a light source and a long light emitter.

  The long light emitter is composed of a long light guide 32 and a cylindrical lens 33 as a light emitting portion provided continuously and integrally in the longitudinal direction of one side of the long light guide 32. And have. A plurality of convex portions indicated by 40 are gates.

  As shown in the drawing, one light source 31 may be disposed at least at one end of the elongated light guide 32, but two or more light sources 31 may be disposed, or one at both ends of the elongated light guide 32. Individual or two or more may be arranged.

  A region 34 for diffusing or reflecting the light is provided on the surface of the cylindrical lens 33 facing the light exit surface 33a. As such a region 34, as in FIG. 1, a rough surface (preferably a sawtooth surface) or a light-reflective coating surface can be applied. Further, the area of the region 34 may be the smallest on the one end face 32a side and the largest on the other end face 32b side.

  Incident light from the light source 31 to the long light guide 32 is reflected in the long light guide 32, then enters the cylindrical lens 33, and after being diffused or reflected in the region 34, is then exited. Since the light is emitted from 33a, light is easily emitted from the cylindrical lens 33, and the uniformity of the light emission state in the longitudinal direction is maintained.

  The cross-sectional area in the width direction of the elongate light guide 32 is the same as that in FIG. 1 so that the one end face 32a side is the largest and the other end face 32b side is the smallest, that is, farther from the light source. Therefore, it is set to be small. The change in the size relationship of the cross-sectional areas in the width direction can be in the same ratio range as in the first embodiment.

  The width of the boundary portion 36 between the elongated light guide 32 and the cylindrical lens 33 is the smallest on the one end face 32a side and the largest on the other end face 32b side for the same reason as in FIG. The distance from the light source 31 is set so as to increase. The change in the width relationship at the boundary portion 36 can be set to the same ratio range as in the first embodiment.

  In the high mount stop lamp 30 for a vehicle, the light incident on the long light guide 32 from the light source 31 passes through the long light guide 32 and is transmitted from the cylindrical lens 33 (emission surface 33a). The light is emitted in a direction orthogonal to the axial direction of the light body 32. The emitted light is uniformly emitted in the longitudinal direction, thereby serving as a high mount stop lamp.

  The high-mount stop lamps for vehicles shown in FIGS. 1 to 4 each have a light emitting diode as a light source and a long light emitter (long light guide) on the same line, so the light emitting diode and the power source are connected. Lead wires can be pulled out on the same line. Because of such a structure, for example, as in Patent Document 1, the workability in a narrow mounting space in the vehicle is improved as compared with a configuration in which the lead wire is pulled out in a direction orthogonal to the length direction of the linear light emitting device. Excellent in terms of ease.

It is a side view of the high mount stop lamp for vehicles. It is a side view of the high mount stop lamp for vehicles of other embodiments. It is sectional drawing of the different location in FIG. It is the perspective view and sectional drawing of the high mount stop lamp for vehicles of another embodiment.

Explanation of symbols

10, 20, 30 High-mount stop lamp for vehicles
11, 21, 31 Light source
12, 22, 32 Long light guide
13, 23, 33 Cylindrical lens

Claims (8)

A high-mount stop lamp for vehicles that combines a light-emitting diode as a light source and a long light-emitting body that guides light in the longitudinal direction and emits the emitted light in a direction perpendicular to the longitudinal direction. Yes,
The long light emitter has a long light guide and a light emitting portion provided continuously and integrally in the longitudinal direction of one side of the light guide,
A high-mount stop lamp for a vehicle in which light guided from at least one end of the long light guide passes through the long light guide and is emitted from the light emitting portion.   The high-mount stop lamp for a vehicle according to claim 1, wherein a cross-sectional area in the width direction of the long light guide becomes smaller as the distance from the light source decreases.   The high-mount stop lamp for a vehicle according to claim 1 or 2, wherein a width of a boundary portion between the long light guide and the light emitting portion increases as the distance from the light source increases.   The whole or part of the side surface of the light guide facing the light emitting portion of the long light guide has a region for diffusing or reflecting light. High-mount stop lamp for vehicles.   The high mount stop lamp for a vehicle according to any one of claims 1 to 3, further comprising a region for diffusing or reflecting light at a portion facing the light emitting surface of the light emitting portion.   The high mount stop lamp for a vehicle according to claim 4 or 5, wherein the light diffusing or reflecting region is a rough surface or a light-reflective coating surface.   The vehicle according to any one of claims 1 to 6, wherein the light-emitting diode as a light source and the elongated light-emitting body are on the same line, and the lead-out direction of the lead wire connecting the light-emitting diode and the automobile power supply is on the same line. High mount stop lamp. The high mount stop lamp for a vehicle according to any one of claims 1 to 7, wherein the light emitting portion is a cylindrical lens.

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