JP2012038424A - Lamp fitting for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lamp fitting for a vehicle capable of achieving uniform light emission up to a tip-end region with a constant plate thickness and improving reduction of cost and utilization efficiency of light source light.SOLUTION: A light guide plate 20 is provided with a first end face 21 to which light from a first LED light source 30 is made incident, and a second end face 22 formed in opposition to the first end face 21 in extension in a convex shape from a first terminal end 31 on one end of the first end face 21 to the other terminal end 32. Furthermore, the light guide plate 20 is provided with a third end face 23 extended in a concave shape along an extended direction of the second end face 22 from the second terminal end 32 of the first end face 21, and a surface 35 irradiating light incident from the first end face 21 surrounded by the first end face 21, the second end face 22 and the third end face 23. Moreover, the light guide plate 20 is also provided with a plurality of step-like reflecting faces 24 to 26 for the second end 22 to internally reflect light incident from the first end face 21 toward a tip-end part 29 as a tip-end region at an extension point of the light guide plate 20.

Description

  The present invention relates to a vehicular lamp such as an automobile, and more particularly to a vehicular lamp that allows light from an LED light source to enter a light guide plate disposed in the vicinity and emit the light from the light guide plate in an irradiation direction.

As a conventional vehicle lamp, a light guide plate having a light incident surface as one surface and a light exit surface as a different surface and a light source disposed opposite to the light incident surface, the light emitted from the light source is emitted as light. There is known a vehicular lamp including a light guide plate light-emitting unit that is introduced into a light guide plate from an incident surface and is emitted from a light output surface (for example, Patent Document 1).
The light guide plate extends long while the light exit surface is curved, and an optical step is provided on the light incident surface to refract the incident light toward the curved direction of the light exit surface.

JP 2010-21001 A

  However, when the plate thickness of the light guide plate is constant, it is impossible to light up to the tip region, and surface emission at the light exit surface becomes non-uniform. In order to shine to the tip region, it is necessary to arrange a large number of light sources at positions other than the light incident surface, and it is difficult to reduce the cost and improve the utilization efficiency of the light source light.

  In addition, by increasing the thickness of the light guide plate near the light exit surface and gradually decreasing the thickness toward the tip region, the tip region of the light guide plate can be illuminated with a minimum number of lamps. It took time to form, and it was difficult to improve productivity.

  SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems, and it is possible for a vehicle to emit light uniformly up to the tip region with a constant plate thickness, and to reduce costs and improve the use efficiency of light source light. It is to provide a lamp.

The object of the present invention is a vehicle lamp comprising a light source and a plate-shaped light guide plate extending in a direction intersecting the lamp optical axis in a lamp chamber formed by a lamp body and a front cover. There,
The light guide plate is formed so as to protrude from a first end face on which light from the light source is incident and from one end of the first end face to the other end side, and to face the first end face. A second end surface, a third end surface extending in a concave shape from the other end of the first end surface along a direction in which the second end surface extends, the first end surface, the second end surface, and the second end surface. A surface surrounded by three end faces and emitting light incident from the first end face, and the second end face transmits light incident from the first end face to a distal end region of the extension destination of the light guide plate. This is achieved by a vehicular lamp characterized in that a plurality of step-like reflecting surfaces that are internally reflected toward the surface are formed.

  According to the vehicular lamp having the above-described configuration, a plurality of step-like reflecting surfaces are formed on the second end surface side where the light incident from the first end surface first arrives, so that the incident light is actively directed toward the tip region. The light distribution can be controlled. Thereby, it is possible to emit light uniformly up to the tip region of the extension destination on the surface of the light guide plate having a substantially constant plate thickness, and it is possible to reduce the cost and improve the utilization efficiency of the light source light.

In the vehicular lamp configured as described above, in the plurality of step-like reflecting surfaces adjacent to each other, the reflecting surface on the distal end region side has a smaller inclination with respect to the first end surface than the reflecting surface on the first end surface side. Is desirable.
According to the vehicular lamp having such a configuration, it is possible to reliably make incident light reach the leading end region of the light guide plate.

Moreover, in the vehicular lamp having the above-described configuration, it is desirable that the step-like reflecting surface is subjected to aluminum vapor deposition.
According to the vehicular lamp having such a configuration, it is possible to improve the reflection efficiency by the reflection surface.

In the vehicular lamp having the above-described configuration, each step surface connecting the plurality of step-like reflecting surfaces is preferably inclined along the light incident from the first end surface.
According to the vehicular lamp having such a configuration, since the step surface is inclined along the incident light, the incident light is not reflected by the step surface and can be efficiently reflected by the reflection surface. .

  According to the vehicular lamp according to the present invention, by forming the plurality of step-like reflecting surfaces on the second end surface side where the light incident from the first end surface first arrives, the incident light is actively directed toward the tip region. Light distribution can be controlled. Thereby, it is possible to emit light uniformly up to the tip region of the extension destination on the surface of the light guide plate having a substantially constant plate thickness, and it is possible to reduce the cost and improve the utilization efficiency of the light source light. Therefore, uniform light emission equivalent to multiple lamps can be realized with the minimum number of lamps, and productivity can be improved and costs can be reduced.

It is a front view of the vehicular lamp which shows one embodiment concerning the present invention. It is the sectional view on the AA line of FIG. FIG. 3 is a cross-sectional view of the light guide plate of FIG. 2 taken along line BB. It is CC sectional view taken on the line of FIG. It is a principal part enlarged view of FIG.

  Hereinafter, an embodiment of a vehicular lamp according to the present invention will be described with reference to FIGS.

  As shown in FIGS. 1 and 2, a vehicular lamp 10 according to an embodiment of the present invention includes a resin lamp body 11 that is fixed to a vehicle body in a shape in which a front side of the vehicle is opened, and a lamp body 11. This is applied to a headlamp including a colorless and transparent front cover 12 attached to the periphery of the opening.

  The vehicular lamp 10 includes a bulb 14 and a reflector 15 arranged as a headlamp unit in a lamp chamber defined by a lamp body 11 and a front cover 12, and a bulb 16 and a reflector 17 arranged as a turn signal lamp unit. And. The front cover 12 slants from the front (left side in the figure) on the center side of the vehicle body to the rear (right side in the figure) on the side of the vehicle body, and is fixed to a mounting portion 19 formed on the periphery of the lamp body 11. ing.

  In the vehicular lamp 10 of the present embodiment, a plate-shaped light guide plate 20 that is curved toward the vehicle body side along the front cover 12 is disposed on the rear surface side of the front cover 12. The light guide plate 20 is made of an acrylic resin having a substantially uniform thickness T, and a first LED light source 30 for light guide is mainly disposed at the lower end portion, and is used as a clearance lamp (CLL). An extension 18 is disposed around the opening of the lamp body 11 to conceal the outer end surfaces of the LED light source 30 and the light guide plate 20.

  As shown in FIG. 3, the light guide plate 20 extends in a tapered manner toward the vehicle body outer side intersecting the lamp optical axis, and has a first end face 21 on which light from the first LED light source 30 enters. is doing. The first end surface 21 has a concave incident surface 33 in the vicinity of the first LED light source 30 between the first terminal end 31 and the second terminal end 32.

  The light guide plate 20 extends in a convex shape from one first end 31 of the first end surface 21 to the other second end 32, and is formed to face the first end surface 21. 22. In addition, the light guide plate 20 has a third end face 23 extending in a continuous concave shape from the second end 32 of the first end face 21 along the direction in which the second end face 22 extends.

  The second end surface 22 is formed with a plurality of step-like reflecting surfaces 24 to 26 that internally reflect light incident from the first end surface 21 toward the distal end portion 29 that is the distal end region of the light guide plate 20. . This step shape is formed by two step surfaces 27 and 28. Specifically, the first step surface 27 is provided between the first reflection surface 24 and the second reflection surface 25, and the second step surface 28 is provided between the second reflection surface 25 and the third reflection surface 26. . The step-like reflecting surfaces 24 to 26 are concealed by the extension 18.

  In the light guide plate 20, the length L 2 of the second reflecting surface 25 is longer than the length L 1 of the first reflecting surface 24, and the length L 3 of the third reflecting surface 26 is longer than the length L 2 of the second reflecting surface 25. Is set. Specifically, for example, the length L2 of the second reflecting surface 25 is three times the length L1 of the first reflecting surface 24, and the length L3 of the third reflecting surface 26 is the length of the first reflecting surface 24. 9 times longer. Thereby, the light guide plate 20 can be formed to have a narrower plate width W, and can be elongated in the horizontal direction at an aspect ratio. In addition, the length L3 of the third reflecting surface 26 far from the first LED light source 30 is set to be longer than the length L1 of the first first reflecting surface 24, so that the light of the first LED light source 30 can be efficiently used. The light can be guided to the tip region.

As shown in FIG. 4, the light guide plate 20 has a surface 35 that is surrounded by the first end surface 21, the second end surface 22, and the third end surface 23 and that emits light incident from the first end surface 21. Further, on the back surface side, a large number of steps 36 which are dots for efficient internal reflection toward the front surface 35 side are formed.
In addition, it is also possible to provide a plate-like reflecting member curved corresponding to the shape of the light guide plate 20 on the back side of the light guide plate 20 without providing the step 36. In this case, the reflecting member has a reflecting surface which is an aluminum vapor deposition film on the resin plate. The light that has escaped to the back surface side of the light guide plate 20 is reflected by this reflecting member and reflected toward the inside of the light guide plate 20.

  The vehicular lamp 10 includes a second LED light source 34 and a reflector 37 mainly for light distribution on a resin substrate 38 behind the first LED light source 30. The light from the second LED light source 34 for light distribution is reflected by the reflector 37, passes through the lower portion of the light guide plate 20, and is emitted from the front cover 12 as outgoing light α1.

  The light from the first LED light source 30 for guiding light is guided in the direction of the tip region while being internally reflected several times in the light guide plate 20, reflected toward the surface 35 side at the step 36 portion, and the front surface. The light is emitted from the cover 12 as outgoing light α2. As a result, the first LED light source 30 can uniformly emit light at the distal end portion 29 that is the distal end region of the light guide plate 20, and the second LED light source 34 can uniformly emit light at the lower portion of the light guide plate 20. Accordingly, uniform light emission equivalent to that of multiple lamps can be realized with the minimum number of two lamps, so that moldability can be improved and costs can be reduced.

  As shown in FIG. 5, in the plurality of step-like reflecting surfaces 24 to 26 adjacent to each other, the inclination angle θ3 with respect to the first end surface 21 of the third reflecting surface 26 on the tip region side is the second angle on the first end surface 21 side. The inclination angle θ2 of the reflecting surface 25 with respect to the first end surface 21 is smaller (θ3 <θ2). Similarly, the inclination angle θ2 of the second reflection surface 25 is smaller than the inclination angle θ1 of the first reflection surface 24 on the first end surface 21 side with respect to the first end surface 21 (θ2 <θ1).

  That is, with reference to the first end face 21, the inclination angle θ 1 of the first reflection surface 24 closest to the first LED light source 30 is greater than the inclination angle θ 3 of the third reflection surface 26 farthest from the first LED light source 30. Is also set large (θ3 <θ2 <θ1). As a result, the reflected light α3 reflected by the first reflecting surface 24 out of the light of the first LED light source 30 incident from the concave incident surface 33 is guided along the second end surface 22 to be third reflected. After being reflected again by the surface 26, the light is guided to the tip portion 29 which is the tip region.

  The reflected light α5 reflected by the second reflecting surface 25 is directly guided to the vicinity of the root of the distal end portion 29, reflected again, and further guided toward the distal end. The reflected light α7 reflected by the third reflecting surface 26 is directly guided to the tip portion of the tip portion 29. Further, the reflected light α8 reflected by the third end surface 23 is reflected by the third reflecting surface 26, is reflected again by the third end surface 23, and is guided to the distal end portion of the distal end portion 29. Further, the light α9 that is a part of the light of the first LED light source 30 is not reflected by the reflecting surfaces 24 to 26 that are the second end surface 22 or the third end surface 23, but is directly the tip portion 29 that is the tip region. Is guided to.

  The first step surface 27 connecting the first reflecting surface 24 and the second reflecting surface 25 has an inclined surface parallel to the incident light α4 incident from the incident surface 33 of the first end surface 21. Similarly, the second step surface 28 connecting the second reflecting surface 25 and the third reflecting surface 26 has an inclined surface parallel to the incident light α6 incident from the incident surface 33. For this reason, the 1st step surface 27 and the 2nd step surface 28 do not function as a reflective surface.

  Further, an aluminum vapor deposition surface 34 is provided outside the reflecting surfaces 24 to 26. Thereby, the light of the 1st LED light source 30 does not leak sideways from the 2nd end surface 22, but can be reflected efficiently.

  According to the vehicular lamp 10 of the present embodiment described above, the light guide plate 20 includes the first end surface 21 on which light from the first LED light source 30 is incident, and the first end 31 of the first end surface 21 to the other end. The second end face 22 is formed so as to protrude toward the second terminal end 32 and to be opposed to the first end face 21. The light guide plate 20 includes a third end surface 23 that extends in a concave shape along the direction in which the second end surface 22 extends from the second terminal end 32 of the first end surface 21, the first end surface 21, the second end surface 22, and the like. The surface 35 is surrounded by the third end face 23 and emits light incident from the first end face 21.

In addition, the light guide plate 20 has a plurality of step-like reflecting surfaces 24 to 25 that internally reflect the light incident on the second end surface 22 from the first end surface 21 toward the distal end portion 29 that is the distal end region of the light guide plate 20. 26. In this way, by forming the plurality of step-like reflecting surfaces 24 to 26 on the second end surface 22 side where the light incident from the first end surface 21 first arrives, the incident light is actively directed toward the tip region. The light distribution can be controlled.
Therefore, the surface 35 of the light guide plate 20 having a substantially constant thickness T can be uniformly emitted to the tip end portion 29 of the extension destination. Therefore, uniform light emission equivalent to that of multiple lamps can be realized with the minimum number of lamps, so that moldability can be improved and costs can be reduced.

  Further, in the reflection surfaces 24 to 26 adjacent to each other, the reflection surface 25 (or 26) on the tip region side has a smaller inclination angle θ with respect to the first end surface 21 than the reflection surface 24 (or 25) on the first end surface side. . Thereby, the incident light can surely reach the tip region of the extension destination of the light guide plate 20.

  Further, an aluminum vapor deposition surface 34 is provided outside the reflecting surfaces 24 to 26. Thereby, the reflection efficiency by the reflective surfaces 24-26 can be aimed at.

  Further, the step surfaces 27 and 28 connecting the reflection surfaces 24 to 26 are inclined surfaces substantially parallel to the light α4 and α6 incident from the first end surface 21. Thereby, incident light is not reflected by the step surfaces 27 and 28, but can be efficiently reflected by the reflective surfaces 24-26.

  In addition, this invention is not limited to embodiment mentioned above, A deformation | transformation, improvement, etc. are possible suitably. In addition, the material, shape, dimension, numerical value, form, number, arrangement location, and the like of each component in the above-described embodiment are arbitrary and are not limited as long as the present invention can be achieved.

For example, the light guide plate 20 has the reflecting surfaces 24 to 26 formed in three steps by the two step surfaces 27 and 28, but may have a multi-stage configuration of two steps or four or more steps.
Further, the plate thickness T of the light guide plate 20 does not need to be constant, and by making the vicinity of the first LED light source 30 thick and gradually thin, uniform light emission of the surface 35 can be performed more efficiently. it can.

DESCRIPTION OF SYMBOLS 10 ... Vehicle lamp, 11 ... Lamp body, 12 ... Front cover, 18 ... Extension, 20 ... Light guide plate, 21 ... 1st end surface, 22 ... 2nd end surface, 23 ... 3rd end surface, 24 ... 1st reflective surface, 25 ... 2nd reflecting surface, 26 ... 3rd reflecting surface, 27 ... 1st step surface, 28 ... 2nd step surface, 29 ... Tip part, 30 ... 1st LED light source, 34 ... 2nd LED light source, 34 ... Aluminum deposition surface, 35 ... Surface, 36 ... Step, T ... Plate thickness, W ... Plate width

Claims (4)

A vehicle lamp comprising a light source and a plate-shaped light guide plate extending in a direction intersecting the lamp optical axis in a lamp chamber formed by a lamp body and a front cover,
The light guide plate includes a first end surface on which light from the light source is incident;
A second end surface formed so as to protrude from one end of the first end surface to the other end side and to face the first end surface;
A third end surface extending in a concave shape along the direction in which the second end surface extends from the other end of the first end surface;
A surface that is surrounded by the first end surface, the second end surface, and the third end surface and that emits light incident from the first end surface;
The vehicular lamp characterized in that the second end surface is formed with a plurality of step-like reflecting surfaces that internally reflect light incident from the first end surface toward a leading end region of the light guide plate. .   2. The plurality of step-like reflecting surfaces adjacent to each other, wherein the reflecting surface on the tip region side has a smaller inclination with respect to the first end surface than the reflecting surface on the first end surface side. Vehicle lamp.   The vehicular lamp according to claim 1 or 2, wherein the stepped reflection surface is subjected to aluminum vapor deposition. 4. The vehicle according to claim 1, wherein each step surface connecting the plurality of step-shaped reflecting surfaces is inclined along light incident from the first end surface. 5. Lamps.

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