WO2014141597A1

WO2014141597A1 - Vehicle lamp fitting

Info

Publication number: WO2014141597A1
Application number: PCT/JP2014/000896
Authority: WO
Inventors: 久代志白須; 辰雄渡辺
Original assignee: 株式会社小糸製作所
Priority date: 2013-03-14
Filing date: 2014-02-21
Publication date: 2014-09-18
Also published as: JP6343601B2; CN105190161A; JPWO2014141597A1

Abstract

This vehicle lamp fitting is provided with: a light control member (53), which controls light emitted from an LED (51) and outputs the light toward the front of the lamp fitting; and an inner lens (55), which is provided so as to cover at least the front surface side of the light control member (53), and which scatters the light outputted from the light control member (53). The light control member (53) includes: a light guide section (61), which has the light inputted thereto from one end side, said light having been emitted from the LED (51), and which outputs the light toward the front of the lamp fitting from an output surface in the extending direction, while guiding the light inside; and a refracting section (62), which refracts the light emitted from the LED (51), and which outputs the light toward the front of the lamp fitting.

Description

Vehicle lighting

The present invention relates to a vehicular lamp, and more particularly to a vehicular lamp provided with a light guide.

As a clearance lamp mounted on a vehicle headlamp or a tail lamp provided at the rear of the vehicle, light from a light source such as an LED is incident on a rod-shaped light guide body from one end side, and the peripheral surface is guided through the inside. What is comprised so that it may radiate | emit ahead from is known. Conventionally, for example, a vehicular lamp as described in Patent Document 1 has been proposed.

Japanese Patent Application Laid-Open No. 2012-174641

In the vehicular lamp described in Patent Document 1, a light shielding member is provided so as to surround the light source in order to prevent a part of the light from the light source from being directly irradiated to the front of the lamp without entering the light guide. It has been. Conversely, a part of the light traveling from the light source to the front of the lamp is blocked by the light shielding member, and the light from the light source cannot be used effectively.

The present invention has been made in view of such circumstances, and an object thereof is to provide a technique capable of improving the utilization efficiency of light from a light source in a vehicular lamp provided with a light guide.

In order to solve the above-described problems, a vehicle lamp according to an aspect of the present invention is configured to control a light from a light source to emit light toward the front of the lamp, and to cover at least the front side of the light control member. And an optical member that scatters light emitted from the light control member. The light control member is formed on the one end side with a light guide portion that emits light from the light source from one end side and emits light toward the front of the lamp from the exit surface along the extending direction while guiding the inside. A refracting unit that refracts light from the light source and emits the light toward the front of the lamp.

According to this aspect, the light from the light source guides the light guide portion and is emitted from the emission surface toward the front of the lamp, and the light from the light source is refracted by the refracting portion and directed toward the front of the lamp. Emitted. Light emitted from the light guide unit and the refraction unit is scattered light by the optical member.

It should be noted that any combination of the above-described constituent elements, and those in which constituent elements and expressions of the present invention are mutually replaced between apparatuses, methods, systems, etc. are also effective as an aspect of the present invention.

According to the present invention, in the vehicular lamp provided with the light guide, the utilization efficiency of light from the light source can be improved.

It is a schematic front view of the vehicular lamp according to the embodiment. FIG. 2 is a sectional view taken along line AA in FIG. 1. FIG. 2 is an enlarged cross-sectional view showing an enlarged periphery of a second lamp unit in a cross section taken along line AA in FIG. 1. FIG. 2 is a sectional view taken along line BB in FIG. It is a perspective view of the light control member of the vehicular lamp which concerns on embodiment. It is an expanded sectional view which expands and shows the refractive part periphery of FIG. 7A and 7B are a top view and a bottom view showing the reflecting member and the light control member, respectively. It is sectional drawing of the 2nd lamp unit of the vehicle lamp which concerns on a modification. It is a perspective view of the light control member of the vehicular lamp which concerns on a modification.

Hereinafter, the same or equivalent components and members shown in each drawing will be denoted by the same reference numerals, and repeated description will be omitted as appropriate. In addition, the dimensions of the members in each drawing are appropriately enlarged or reduced for easy understanding. Also, in the drawings, some of the members that are not important for describing the embodiment are omitted.

FIG. 1 is a schematic front view of a vehicular lamp 10 according to an embodiment. Here, the vehicular lamp 10 is a tail lamp provided at the rear of the vehicle. FIG. 2 is a sectional view taken along line AA in FIG. The vehicular lamp 10 includes a lamp body 20, a translucent cover 30, and a first lamp unit 40 and a second lamp unit 50 that respectively form a tail lamp light distribution.
In the following description, the light transmitting cover 30 side is the front side, and the lamp body 20 side is the rear side.

The lamp body 20 is formed in a box shape having an opening. The translucent cover 30 is formed in a bowl shape with translucent resin or glass. The translucent cover 30 is attached to the opening of the lamp body 20.

The first lamp unit 40 is inserted into the light source fixing through hole 21 formed in the lamp body 20 and fixed to the lamp body 20. In FIG. 2, a reflective lamp unit is shown as the first lamp unit 40. Since the reflective first lamp unit 40 is publicly known, detailed description thereof is omitted here. In addition, the kind of 1st lamp unit 40 is not specifically limited, For example, a projector-type lamp unit may be sufficient. The second lamp unit 50 is disposed in the lamp chamber 12 formed by the lamp body 20 and the translucent cover 30. Here, the second lamp unit 50 is disposed below the first lamp unit 40. Hereinafter, the second lamp unit 50 will be described in detail.

FIG. 3 is an enlarged cross-sectional view showing the periphery of the second lamp unit 50 in a cross section taken along the line AA in FIG. 4 is a cross-sectional view taken along line BB in FIG. FIG. 5 is a perspective view of the light control member of FIGS. 3 and 4. The second lamp unit 50 includes an LED 51, a substrate 52, a light control member 53, a reflection member 54, and an inner lens 55. The LED 51 is a light source that supplies light to the light control member 53. The substrate 52 carries the LED 51. That is, the board | substrate 52 functions as a light source mounting part for mounting LED51.

The light control member 53 includes a light guide part 61, a refracting part 62, a first fixing part 65, and a second fixing part 66. These are integrally formed by injection molding using a transparent resin such as acrylic or polycarbonate. If the molding is performed integrally, the process of joining the two becomes unnecessary, so that the processing cost can be reduced. These may be formed after being formed separately.

The light guide 61 is a rod-shaped member having a substantially rectangular cross section. As shown in FIG. 4, the light guide 61 has a slightly curved shape. The light guide 61 may have a linear shape or other shapes. The light guide 61 is arranged such that an end surface 61 a on one end side thereof is positioned in the vicinity of the LED 51. The end surface 61a functions as an incident surface on which light from the LED 51 is incident. The light incident from the end face 61a travels in the light guide 61 toward the end face 61g on the other end side.

On the rear surface 61 c of the light guide unit 61, a plurality of steps 61 f are formed along the extending direction of the light guide unit 61 to reflect a part of the light traveling in the light guide unit 61 toward the front surface 61 b. . The light reflected toward the front surface 61b by the step 61f is emitted from the front surface 61b to the outside of the light guide unit 61. That is, the front surface 61b of the light guide unit 61 functions as an emission surface that emits light forward of the lamp. The shape, size, arrangement pitch, and the like of the step 61f are designed so that light having the intensity required for the tail lamp is emitted forward from the front surface 61b. As an example, the arrangement pitch may be narrowed from the end face 61a toward the end face 61g on the other end side.

Further, a part of the light incident from the end surface 61a travels in the light guide unit 61 while being repeatedly reflected between the upper surface 61d and the lower surface 61e on the plane. At this time, part of the light is emitted outside the light guide 61 without being reflected by the upper surface 61d or the lower surface 61e. That is, since the cross section has a rectangular shape, light is emitted from the upper surface 61d and the lower surface 61e in addition to the light emitted from the front surface 61b. Thereby, the light guide part 61 can be made to light-emit in a comparatively thick strip | belt shape.

The refracting portion 62 is connected to the outer edge on the end surface 61 a side of the light guide portion 61 and is provided so as to cover the front side of the lamp of the LED 51. 6 is an enlarged cross-sectional view showing the periphery of the refracting portion 62 in FIG. The arrows in FIG. 6 indicate light rays. The refracting portion 62 includes a first refracting portion 63 that protrudes from the end portion on the end surface 61 a side of the light guide portion 61 toward the front side of the lamp, and an end portion of the first refracting portion 63 opposite to the light guiding portion 61. And a second refracting portion 64 protruding in a direction away from the end face 61 g of the light guide portion 61. The first refracting portion 63 has an incident surface 63a on which light from the LED 51 is incident, and an output surface 63b that emits incident light forward of the lamp. Similarly, the second refracting portion 64 has an entrance surface 64a and an exit surface 64b. Direct light from the LED 51 is refracted by the incident surfaces 63a and 64a and the emission surfaces 63b and 64b, and is diffused and emitted from the outer edge of the light guide unit 61 to the front side of the lamp of the substrate 52. The light emitted from the refraction part 62 and the light emitted from the light guide part 61 form a continuous band-like light. As described above, the refraction unit 62 can effectively use a part of the light that is not incident on the light guide unit 61.

Further, since the light incident on the refracting portion 62 is diffused and emitted from the outer edge of the light guide portion 61 to the front side of the lamp of the substrate 52, uneven brightness in which the vicinity of the LED 51 shines extremely brightly is suppressed. That is, luminance unevenness in the vicinity of the LED 51 can be suppressed without providing a light blocking member for blocking light that is not incident on the light guide unit 61. Therefore, the number of parts of the second lamp unit 50 can be reduced. Returning to FIGS.

The first fixing portion 65 is formed so as to protrude rearward from the end portion of the second refracting portion 64 opposite to the first refracting portion 63. The second fixing portion 66 is formed so as to protrude rearward from the end portion on the end surface 61 g side of the light guide portion 61. By fixing the first fixing portion 65 and the second fixing portion 66 to the lamp body 20, the entire light control member 53 is fixed to the lamp body 20. Here, the first fixing portion 65 is fixed to the lamp body by lance engagement in a state where the second fixing portion 66 is positioned in contact with the lamp body 20. Of course, the first fixing part 65 and / or the second fixing part 66 may be fixed to the lamp body 20 by bolts or other means.

The reflection member 54 is a member having a substantially U-shaped cross section, and is provided behind the light control member 53. The reflecting member 54 includes an upper reflecting portion 54a and a lower reflecting portion 54b that face each other, and a base portion 54c that is interposed between the upper reflecting portion 54a and the lower reflecting portion 54b. The upper reflection part 54a, the lower reflection part 54b, and the base part 54c are integrally formed by injection molding using an acrylic resin colored milky white.

The upper reflecting portion 54 a faces the upper surface 61 d of the light guide portion 61 and reflects part of the light leaking from the upper surface 61 d toward the light guide portion 61. Similarly, the lower reflective portion 54 b faces the lower surface 61 e of the light guide portion 61 and reflects part of the light leaking from the lower surface 61 e toward the light guide portion 61. The light reflected by the upper reflection part 54a and the lower reflection part 54b returns to the light guide part 61 and guides the light guide part 61 again. Thereby, it can reduce that light quantity reduces as light advances in the light guide part 61 toward the end surface 61g from the end surface 61a. The upper reflecting portion 54a only needs to be able to reflect at least a part of the light leaked from the upper surface 61d toward the light guide portion 61, and may be formed by, for example, depositing aluminum on a reflecting surface of an acrylic resin. The same applies to the lower reflecting portion 54b.

The inner lens 55 is provided so as to cover the entire front surface of the light control member 53, that is, the entire front surfaces of the light guide unit 61 and the refraction unit 62. The inner lens 55 has a substantially U-shaped cross section orthogonal to the extending direction. The inner lens 55 includes an upper surface portion 55a and a lower surface portion 55b facing each other, and a front surface portion 55c interposed between the upper surface portion 55a and the lower surface portion 55b. The inner lens 55 is configured such that the upper surface portion 55 a is located above the light control member 53 and the lower surface portion 55 b is located below the light control member 53. A part of the light emitted from the light guide unit 61 and the refraction unit 62 passes through the front surface part 55c and is emitted forward of the lamp. In addition, a part of the light passes through the upper surface portion 55a or the lower surface portion 55b and is emitted forward of the lamp. As a result, even when the vehicle lamp 10 is viewed from above or below, the second lamp unit 50 appears to emit light in a band shape, so that the visibility of the vehicle lamp 10 is improved.

The inner lens 55 is blended with a diffusing agent that scatters light. The diffusing agent is, for example, a white resin piece, metal powder, glass fine particles, or the like. As a result, light from the light guide unit 61 and the refraction unit 62 passes through the inner lens 55 and becomes scattered light with low directivity. That is, the light becomes uniform with little luminance unevenness. Note that the diffusing agent may be disposed on the surface of the inner lens 55. Further, instead of the diffusing agent or together with the diffusing agent, a so-called embossing process in which the surface of the inner lens 55 is roughened may be performed. The same effect as the diffusing agent can be obtained by the texture processing.

Here, in the technique in which the light from the light source is incident on the light guide and emitted from the circumferential surface forward while guiding the inside, the amount of light emitted from the light guide decreases as the distance from the light source increases. . The structure of the 2nd lamp unit 50 for respond | corresponding to this is demonstrated. In the following description, each item is described as (1) to (3), but these may be used in any combination.

(1) The light guide 61 is formed such that the closer to the end face 61g from the end face 61a, the closer the front face 61b and the rear face 61c are, and the thinner the light guide 61 is. In other words, the light guide portion 61 is formed so that the cross-sectional area perpendicular to the extending direction decreases as the end surface 61a approaches the end surface 61g. Since the light guide 61 has such a shape, it becomes easier to emit light as it approaches the end surface 61g, so that the light guide 61 can emit light relatively uniformly.

(2) Further, the light guide 61 is disposed so as to be closer to the inner lens 55 as it approaches the end surface 61g from the end surface 61a. In other words, the light guide unit 61 is arranged such that the gap between the light guide unit 61 and the inner lens 55 becomes narrower as it approaches the end surface 61g side from the end surface 61a side. As a result, the light emitted from the light guide 61 is likely to reach the inner lens 55 as it approaches the end surface 61g. Therefore, the light emitted through the inner lens 55 is directed from the end surface 61a side to the end surface 61g side. Can be uniform.

(3) FIGS. 7A and 7B are a top view and a bottom view showing the reflecting member 54 and the light control member 53, respectively. As shown in FIG. 7A, the upper reflecting portion 54a is formed such that the area facing the upper surface 61d of the light guide portion 61 decreases as the end surface 61a approaches the end surface 61g. Similarly, as shown in FIG. 7B, the lower reflective portion 54b is formed such that the area facing the lower surface 61e decreases as the end surface 61a approaches the end surface 61g. As a result, the upper surface 61d or the lower surface 61e can be caused to emit light uniformly from the end surface 61a side to the end surface 61g side while suppressing the light amount from decreasing as the end surface 61a approaches the end surface 61g.

The operation of the second lamp unit 50 configured as described above will be described. When a current is supplied to the LED 51, light is emitted from the LED 51. A part of the light emitted from the LED 51 enters the light guide 61 from the end face 61a. The light incident on the light guide 61 travels in the light guide 61 while repeating total reflection. Light that has entered the step 61f provided on the rear surface 61c of the light guide 61 while traveling through the light guide 61 is reflected toward the front surface 61b and emitted from the front surface 61b. Similar reflection occurs in each step 61f provided along the extending direction of the light guide portion 61, whereby light is emitted from substantially the entire region of the front surface 61b. Further, part of the light traveling through the light guide 61 is emitted from the upper surface 61d or the lower surface 61e to the outside of the light guide 61. A part of this light is returned to the light guide part 61 by the reflecting member 54 and is guided through the light guide part 61 again. In this way, the light incident on the light guide unit 61 is emitted out of the light guide unit 61 from the front surface 61b, the upper surface 61d, and the lower surface 61e.

Further, a part of the light emitted from the LED 51 is incident on the first refracting portion 63 or the second refracting portion 64. The first refracting unit 63 and the second refracting unit 64 refract the direct light from the LED 51, diffuse the light from the outer edge of the light guide unit 61 toward the front side of the lamp of the substrate 52, and emit it. Light emitted from the light guide unit 61, the first refracting unit 63, and the second refracting unit 64 is irradiated to the front of the vehicular lamp 10 through the inner lens 55.

According to the vehicular lamp 10 according to the present embodiment described above, a part of the light that is not incident on the light guide unit 61 is diffused from the outer edge of the light guide unit 61 to the front side of the lamp of the substrate 52 and emitted to the front side of the lamp. Is done. That is, the light from the LED 51 can be used effectively. Further, according to the vehicular lamp 10 according to the present embodiment, the light emitted from the light guide unit 61 and the refracting unit 62 is emitted forward of the lamp through the inner lens 55 having a diffusing agent. As a result, scattered light with weak directivity is formed, and uniform strip-shaped light with less luminance unevenness is formed. The light guide 61 has a substantially rectangular cross section, and light is emitted from the upper surface 61d and the lower surface 61e in addition to the front surface 61b. For this reason, it is possible to emit light in a band shape having a relatively wide width.

The present invention has been described based on the embodiments. This embodiment is an exemplification, and it will be understood by those skilled in the art that various modifications can be made to combinations of the respective constituent elements and processing processes, and such modifications are also within the scope of the present invention. is there.

(Modification 1)
The main difference between the vehicular lamp 10 according to the embodiment and the vehicular lamp according to the first modification is the shape of the light control member 53. FIG. 8 is a cross-sectional view of the second lamp unit 50 of the vehicular lamp according to the first modification. FIG. 8 corresponds to FIG. FIG. 9 is a perspective view of the light control member 53 of the vehicular lamp according to the modification. FIG. 9 corresponds to FIG. In the present modification, a cylindrical step 63 c is formed on the emission surface 63 b of the first refracting portion 63. Further, a cylindrical step 64 c is formed on the emission surface 64 b of the second refracting portion 64. Steps 63 c are arranged along a direction (vertical direction) perpendicular to the extending direction of the first refracting portion 63 on the light emitting surface 63 b that is relatively parallel to the light emitting direction (front-back direction of the lamp). On the other hand, steps 64c are arranged along the extending direction of the second refracting portion 64 on the emission surface 64b. Thereby, the light that has passed through the emission surface 63b is diffused in the vertical direction, and the light that has passed through the emission surface 64b is diffused in the horizontal direction. For this reason, the luminance unevenness in the vicinity of the LED 51 is further suppressed.

(Modification 2)
In the embodiment, the case where the inner lens 55 has a substantially U-shaped cross section has been described. However, the present invention is not limited to this. For example, the inner lens 55 may have a substantially L-shaped cross section, an arc shape, or other bent or curved shape.

(Modification 3)
In the embodiment, the case where the refracting unit 62 includes the first refracting unit 63 and the second refracting unit 64 has been described, but the present invention is not limited thereto. The refracting unit 62 only needs to cover the front side of the lamp of the LED 51, refract the light from the LED 51, and diffuse and emit the light from the outer edge of the light guide unit 61 to the front side of the lamp of the substrate 52. Therefore, for example, the refracting unit 62 may not include the first refracting unit 63, and the second refracting unit 64 may be connected to the light guide unit 61.

(Modification 4)
In the embodiment, the case where the vehicular lamp 10 is a tail lamp has been described. However, the present invention is not limited to this. For example, a stop lamp, a clearance lamp, a turn lamp, and a rear combination lamp may be used.

10 vehicle lamp, 20 lamp body, 30 translucent cover, 40 first lamp unit, 50 second lamp unit, 51 LED, 52 substrate, 53 light control member, 54 reflecting member, 55 inner lens, 61 light guide, 62 refraction part, 63 first refraction part, 64 second refraction part, 65 first fixation part, 66 second fixation part.

The present invention can be used for a vehicle lamp provided with a light guide.

Claims

A light control member that controls the light from the light source and emits it toward the front of the lamp;
An optical member provided to cover at least the front surface side of the light control member, and to scatter light emitted from the light control member,
The light control member is
A light guide unit that emits light from the light source from one end side and emits light toward the front of the lamp from an emission surface along the extending direction while guiding the inside;
A vehicular lamp, comprising: a refracting portion that is formed on the one end side and refracts light from the light source and emits the light toward the front of the lamp.
2. The vehicular lamp according to claim 1, wherein the light guide portion and the refracting portion are integrally formed.
3. The vehicular lamp according to claim 1, wherein a fixing portion for fixing the light control member is formed in the refracting portion.
4. The vehicular lamp according to claim 1, wherein the optical member has a diffusing agent.
5. The vehicular lamp according to claim 1, wherein the light guide portion is closer to the optical member as it approaches the other end side from the one end side.