JP2021073676A - Vehicular light emitting device - Google Patents

Abstract

To enable performance which shows as if there were many more light sources than the actual number of the light sources, and to reduce unevenness in luminance.SOLUTION: In a vehicular light emitting device, a plurality of light emitting units 100 each of which has an LED part 20 and a lens 30 for diffusing and emitting the light entered from the LED part 20 are arranged side by side. Even between the plurality of light emitting units 100, one or more peak values in luminance exist. Also, the light emitted from the lenses of the light emitting units 100 has a plurality of peaks in luminance with respect to the spread direction of the light, and the arrangement interval of the plurality of light emitting units 100 is set so that the plurality of peaks in luminance of the light emitted from the plurality of light emitting units 100 are arrayed substantially at equal intervals.SELECTED DRAWING: Figure 1

Description

The present invention relates to a vehicle light emitting device, and more particularly to a vehicle light emitting device including a plurality of light sources.

Some vehicle light emitting devices are provided with a plurality of light sources. In such a vehicle light emitting device, various lighting effects may be produced by simultaneously illuminating a plurality of light sources or sequentially illuminating them.

For example, in Patent Document 1 below, in a vehicle light emitting device including a plurality of LEDs, in order to suppress the occurrence of uneven brightness in the light emitted from the LEDs, the light from each LED is reflected and diffused over a wide range. Is provided.

Japanese Unexamined Patent Publication No. 2012-17063

If the light from the plurality of light sources is reflected and mixed in order to suppress the uneven brightness of the plurality of light sources, it becomes unclear which light source is shining, and there is a risk that the color rendering index of the lighting is deteriorated. On the other hand, increasing the number of light sources causes problems in terms of power consumption and cost.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a light emitting device for a vehicle capable of producing a light source having a larger number of light sources than an actual number of light sources and reducing uneven brightness. There is.

The problem is that a plurality of light emitting units including a light source and a lens that diffuses and emits light incident from the light source are arranged side by side, and one or more peak values of brightness are also arranged between the plurality of light emitting units. It is solved by the existing vehicle light source.

In the above-mentioned vehicle light emitting device, by making one or more brightness peaks exist between a plurality of light emitting units each having a light source, it is possible to produce as if there are more light sources than the actual number of light sources. Therefore, uneven brightness can be reduced.

In the vehicle light emitting device, the light emitted from the lens of the light emitting unit has a plurality of luminance peaks with respect to the spreading direction of the light, and a plurality of light emitted from the plurality of light emitting units. The arrangement intervals of the plurality of light emitting units may be set so that the peaks of brightness are arranged at substantially equal intervals. As a result, the peaks of the brightness of the light emitted from the plurality of light emitting units are at substantially equal intervals, so that the unevenness of the brightness can be further reduced.

The vehicle light emitting device may include a holding unit that holds the plurality of light emitting units, and the holding unit may have a reflecting unit that reflects the light emitted from the lens toward the light emitting surface. Thereby, the irradiation direction of light can be adjusted.

In the vehicle light emitting device, the reflecting portion may have a convex portion formed at a position facing the light source. Thereby, the reflection direction of the light in the reflecting portion can be adjusted, and the uneven brightness can be further reduced.

In the vehicle light emitting device, the holding portion may have a recess formed between the regions for holding the plurality of light emitting units. As a result, it is possible to control the reflection direction from the holding portion side and reduce the uneven brightness.

The vehicle light emitting device includes a cover that engages with the holding portion and covers the plurality of light emitting units, and the cover has the greatest distance from the lens at the end of the lens on the light emitting side. It may be a shape that is close to each other. As a result, it is possible to prevent the light from diffusing toward the cover side.

In the vehicle light emitting device, the lens may have locking claws at both ends and may be snap-fixed to the holding portion by the locking claws. As a result, the lens can be stably attached to the holding portion.

In the vehicle light emitting device, the lens may be formed with ribs that regulate rotation with respect to the holding portion. As a result, the rotation of the lens with respect to the holding portion is restricted, so that the light irradiation direction can be stabilized. Further, since the movement of the lens when the vehicle vibrates is also regulated, the generation of noise due to the lens colliding with other members is suppressed.

In the vehicle light emitting device, the lens may have a notch formed at a position facing the light source. As a result, the light incident on the lens can be refracted in the direction of diffusion.

In the vehicle light emitting device, the lenses may have light source introduction portions that are provided on both sides of the notch and project to the light source side. This makes it easier to determine the position of the light source with respect to the lens, so that the positioning accuracy between the light source and the lens can be improved.

According to the present invention, it is possible to produce as if there are more light sources than the actual number of light sources, and uneven brightness can be reduced.

According to one aspect of the present invention, since the peaks of the brightness of the light emitted from the plurality of light emitting units are at substantially equal intervals, the unevenness of the brightness can be further reduced.

According to one aspect of the present invention, the irradiation direction of light can be adjusted.

According to one aspect of the present invention, the reflection direction of light in the reflecting portion can be adjusted, and uneven brightness can be reduced.

According to one aspect of the present invention, it is possible to control the reflection direction from the holding portion side and reduce the uneven brightness.

According to one aspect of the present invention, it is possible to prevent light from diffusing toward the cover side.

According to one aspect of the present invention, the lens can be stably attached to the holding portion.

According to one aspect of the present invention, the rotation of the lens with respect to the holding portion is restricted, so that the light irradiation direction can be stabilized.

According to one aspect of the present invention, the light incident on the lens can be refracted in the direction of diffusion.

According to one aspect of the present invention, the position of the light source with respect to the lens can be easily determined, so that the positioning accuracy between the light source and the lens can be improved.

It is a top view of the light emitting device for a vehicle which concerns on 1st Embodiment. FIG. 2 is a sectional view taken along line II-II of FIG. It is a perspective view of the state which removed the cover of the light emitting device for a vehicle which concerns on 1st Embodiment. It is a figure which shows the characteristic of the luminance peak of the light emitting unit in the light emitting device for a vehicle which concerns on 1st Embodiment. It is a figure which shows the characteristic of the luminance peak of a plurality of light emitting units which set the arrangement interval in the light emitting device for a vehicle which concerns on 1st Embodiment. It is a top view of the light emitting device for a vehicle which concerns on 2nd Embodiment. FIG. 7 is a sectional view taken along line VII-VII of FIG. An example of the configuration of the lens when the rotation regulation mechanism is provided is shown, (A) is a plan view of a light emitting unit including the lens, and (B) is a side view of (A). It is a figure explaining the shape of the light emitting unit group which connected a plurality of light emitting units. It is a top view of the light emitting device for a vehicle which concerns on 3rd Embodiment. FIG. 10 is a sectional view taken along line XI-XI of FIG. It is a figure which shows the characteristic of the luminance peak of the light emitting unit which concerns on 3rd Embodiment. It is a figure which shows the characteristic of the luminance peak of a plurality of light emitting units which set the arrangement interval in the light emitting device for a vehicle which concerns on 3rd Embodiment.

Hereinafter, the vehicle light emitting device according to the embodiment of the present invention will be described with reference to FIGS. 1 to 13.

In the present embodiment, a plurality of light emitting units including a light source and a lens that diffuses and emits light incident from the light source are arranged side by side, and one peak value of brightness is also provided between the plurality of light emitting units. The present invention relates to the above-mentioned invention of a light source for a vehicle.

<First Embodiment>
First, the vehicle light emitting device 1 according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 5.

FIG. 1 is a plan view of the vehicle light emitting device 1 according to the first embodiment, FIG. 2 is a sectional view taken along line II-II of FIG. 1, and FIG. 3 shows the vehicle light emitting device 1 with the cover 50 removed. It is a perspective view of the state.

As shown in FIG. 1, the vehicle light emitting device 1 mainly includes a cover 50, an LED unit 20 as a light source, a lens 30, an LED unit 20, a lens 30 and the like that diffuse and emit light incident from the LED unit 20. The holder 10 (holding portion) for holding the light is provided. Further, the holder 10 is provided with a mirror-finished reflecting portion 11 composed of a convex portion 12 and a flat portion 13, and the reflecting portion 11 covers the refracted light from the lens 30 to the window portion 51 (light emitting surface) of the cover 50. ) Is reflected. In the following, the emission direction of the LED unit 20 (that is, the side from the LED unit 20 toward the notch portion) is the front, the opposite is the rear, the side far from the center of the lens 30 is the outside, and the opposite is the inside. ..

As shown in FIG. 1, the lens 30 is provided at the center of the lens main body 31 and the lens main body 31 and at a position facing the LED 20, at the notch 32 and the rear side of the notch 32. A light source introduction unit 33 that protrudes toward the LED unit 20 and introduces incident light from the LED unit 20 and a mounting structure 34 that projects outward from both sides of the lens body 31 to attach the lens 30 to the holder 10. ing. A locking claw portion 35 is provided at the rear side end portion of the mounting structure portion 34, and is snap-fit-fixed to the holder 10 by the locking claw portion 35.

Here, as shown in FIG. 1, the curvature of the notch portion 32 is larger than the curvature of the front edge portion (for example, the mean curvature) of the lens main body portion 31. The curvature of the front edge of the lens body 31 may or may not be constant. If it is not constant, for example, the curvature at the center of the front edge may be made smaller than the curvature outside the center.

Further, as shown in FIGS. 1 to 3, one LED unit 20 is in series with respect to each of the plurality of lenses 30 (that is, the central axis of the lens 30 and the optical axis of the LED unit 20 are parallel to each other (also coincident). The LED unit 20 and the lens 30 arranged in series are combined to form the light emitting unit 100. By arranging the LED unit 20 and the lens 30 in series to form the light emitting unit 100 in this way, the light emitting unit 100 can be made thinner. By mounting such a thin light emitting unit 100, the light emitting device 1 for a vehicle can be made thin, so that the degree of freedom of installation in a vehicle can be increased.

As shown in FIG. 1, the vehicle light emitting device 1 includes a plurality of light emitting units 100, and the plurality of light emitting units 100 are arranged in parallel with the longitudinal direction of the window portion 51. Here, as shown in FIGS. 1 and 3, a convex portion 12 is provided at a position of the reflecting portion 11 facing the light emitting unit 100 (that is, the LED portion 20), and the light emitting unit 100 adjacent to the light emitting unit 100 is provided. A flat surface portion 13 is provided between the positions facing each other (that is, between the convex portion 12 and the convex portion 12). By doing so, the reflection direction of the light in the reflecting portion 11 can be adjusted, and the brightness unevenness can be further reduced.

As shown in FIG. 2, the cover 50 has a shape that is inclined toward the lens 30 from the rear to the front of the lens 30, and in particular, the cover 50 and the lens 30 are closest to each other at the front end of the lens 30. ing. As a result, it is possible to prevent the light emitted from the front end of the lens 30 from being reflected by the cover 50 and returning to the rear side of the window 51, so that the light emitted from the window 51 to the outside of the vehicle light emitting device 1 can be prevented. It is possible to suppress a decrease in the brightness of the irradiated light. In the following, the window 51 side of the vehicle light emitting device 1 will be the light emitting surface side, and the opposite side will be the back surface side.

Further, as shown in FIG. 2, the holder 10 extends to the back surface side at the holder base region 16 extending from the front to the rear and the rear end portion of the holder base region 16, and the LED portion 20 is attached and fixed. The LED mounting area 17, the lens fixing area 18 extending from the holder base area 16 to the light emitting surface side and the lens 30 being mounted and fixed, and the front end of the holder base area 16 extending to both the light emitting surface side and the back surface side. It has a reflecting portion forming region 19 in which a reflecting portion 11 is provided on a slope on the light emitting surface side facing the lens 30. Here, the angle (inclination) of the reflecting surface may be set so that the intensity of the reflected light from the lens 30 to the window portion 51 is maximized.

Further, as shown in FIG. 3, the lens fixing region 18 of the holder 10 has an insertion hole 14 through which the light source introduction portion 33 of the lens 30 is inserted, and a rear end portion (locking claw) of the mounting structure portion 34 of the lens 30. Each of the insertion holes 15 through which the portion 35 is inserted is provided.

Further, a control circuit (not shown) is connected to the LED unit 20, and the control circuit controls the light emission timing, light emission time, and the like of each of the plurality of LED units 20. As a result, various lighting effects can be produced by causing the plurality of LED units 20 to emit light at the same time, a part of the plurality of LED units 20 to emit light, and the plurality of LED units 20 to emit light so as to flow to the left and right. can do.

Next, the luminance characteristics of the light emitting unit 100 provided in the vehicle light emitting device 1 according to the first embodiment and the luminance characteristics of the plurality of light emitting units 100 will be described with reference to FIGS. 4 and 5.

FIG. 4 shows the brightness characteristics of the single light emitting unit 100. FIG. 4 shows the relationship between the position of the single light emitting unit 100 on the light emitting surface on the front side (that is, the position in the width direction of the light emitting surface) and the brightness. As shown in FIG. 4, in the light emitting unit 100, the first luminance peak is located at a position passing through the center of the notch 32 from the LED portion 20, and two luminance peaks are formed on the left and right of the first luminance peak. There are peaks (second luminance peak and third luminance peak). As described above, in the spreading direction of the light emitted from the light emitting unit 100 according to the shape (particularly size and curvature) of the lens body portion 31 of the lens 30 and the shape (particularly size and curvature) of the notch portion 32. Multiple peaks of brightness will appear.

Further, FIG. 5 shows the luminance characteristics when a plurality of light emitting units 100 are arranged at predetermined arrangement intervals (D). FIG. 5 shows the relationship between the position and the brightness of the plurality of light emitting units 100 on the light emitting surface on the front side. As shown in FIG. 5, by adjusting the arrangement interval of the light emitting units 100, the peaks of the brightness on the light emitting surface can be made substantially equal intervals. By adjusting the arrangement interval of the light emitting units 100 in this way, a peak also exists between the positions facing the light emitting unit 100 on the light emitting surface, so that the number of light emitting units 100 (that is, the number of light sources) is increased. It is possible to produce as if there are many light sources, and it is possible to reduce uneven brightness. Further, by setting the brightness peaks at substantially equal intervals, it is possible to further reduce the brightness unevenness.

<Second embodiment>
Next, the vehicle light emitting device 1A according to the second embodiment of the present invention will be described with reference to FIGS. 6 and 7.

FIG. 6 is a plan view of the vehicle light emitting device 1A according to the second embodiment, and FIG. 7 is a sectional view taken along the line VII-VII of FIG. Since the light emitting unit 100 mounted on the vehicle light emitting device 1A according to the second embodiment is the same as that of the first embodiment, the description thereof will be omitted. Hereinafter, the differences from the first embodiment will be mainly described.

As shown in FIGS. 6 and 7, in the vehicle light emitting device 1A according to the second embodiment, the structures of the cover 50A and the holder 10A are different from the vehicle light emitting device 1 according to the first embodiment. That is, as shown in FIG. 7, in the second embodiment, the light emitting unit 100 and the window portion 51A of the cover 50A are arranged in the series direction, and the holder 10A is not provided with the reflection portion forming region 19. There is a difference from the first embodiment in that. Furthermore, in the second embodiment, a bowl-shaped recess 60 is formed on the light emitting surface side of the base portion (holder base region 16A) of the holder 10A and on the surface between the adjacent light emitting units 100. There is a difference from the first embodiment in that. The recess 60 may be formed so that the width gradually decreases from the front end portion of the holder base region 16A to the position at the center of the lens 30.

By forming the bowl-shaped recess 60 in the holder base region 16A as described above, the reflection direction from the holder 10A side can be controlled and the brightness unevenness can be reduced.

Here, another configuration example of the lens 30 mounted on the vehicle light emitting device 1 (which can be similarly applied to 1A) will be described with reference to FIGS. 8 and 9.

FIG. 8 shows a configuration example of the lens 30 when the lens 30 is provided with a rotation regulation mechanism for the holder 10. 8 (A) shows a plan view of the light emitting unit 100 including the lens 30 fixed to the holder 10, and FIG. 8 (B) shows a side view of FIG. 8 (A). As shown in FIGS. 8A and 8B, ribs 36 projecting vertically from the mounting structure 34 are provided on both sides of the mounting structure 34 in the lens 30 of the light emitting unit 100, respectively.

As shown in FIG. 8B, the rib 36 performs a swinging motion of the lens 30 with respect to the holder 10 (that is, a rotational motion in which the front end portion of the lens 30 approaches or moves away from the holder base region 16). The rib 36 of the 30 abuts on the lens fixing region 18 of the holder 10 to perform a regulating function. As a result, the movement of the lens 30 with respect to the holder 10 and the LED unit 20 from the initial arrangement can be regulated, so that the irradiation direction from the light emitting unit 100 can be stabilized. Further, since the movement of the lens 30 is restricted, the lens 30 is suppressed from colliding with other members even when the vehicle vibrates, and the noise is also reduced.

In the above embodiment, an example of a structure in which a single light emitting unit 100 is attached to the holder 10 has been described, but as shown in FIG. 9, a light emitting unit group 101 in which a plurality of light emitting units 100 are connected by a connecting portion 37 is provided. It may be attached to the holder 10.

<Third embodiment>
Next, the vehicle light emitting device 1B according to the third embodiment of the present invention will be described with reference to FIGS. 10 to 13.

FIG. 10 is a plan view of the vehicle light emitting device 1B according to the third embodiment, and FIG. 11 is a sectional view taken along the line XI-XI of FIG.

As shown in FIG. 10, the vehicle light emitting device 1B according to the third embodiment mainly includes a cover 50B, an LED unit 20 as a light source, and a lens 30B that diffuses and emits light incident from the LED unit 20. A holder 10B (holding portion) for holding the LED portion 20 and the lens 30B and the like is provided. Further, the holder 10B is provided with a mirror-finished reflecting portion 11, and the reflecting portion 11 reflects the refracted light from the lens 30B toward the window portion 51B (light emitting surface) of the cover 50. ing.

As shown in FIG. 10, the lens 30B includes a notch portion 32B provided at a position facing the LED portion 20 at the center of the lens main body portion 31B and the lens main body portion 31B. In the following, the lens 30B and the LED unit 20 arranged in series are combined to form a light emitting unit 100B.

As shown in FIG. 11, the cover 50B has a U-shape, and the light emitting surface forming surface provided with the window portion 51B and the lens 30B of the cover 50B are substantially parallel to each other. Further, the length of the light emitting surface forming surface in the front-rear direction (the length in the direction perpendicular to the arrangement direction of the light emitting unit 100B) is longer than that in the first embodiment. Hereinafter, the window portion 51B side of the vehicle light emitting device 1B is referred to as the light emitting surface side, and the opposite side thereof is referred to as the back surface side.

Further, as shown in FIG. 11, the holder 10 is substantially parallel to the U-shaped LED mounting area 17B to which the LED portion 20 is mounted and fixed, and the LED mounting area 17B to the lens 30B that support the lens 30B. It has a holder base region 16B extending from the holder base region 16B, and a reflecting portion forming region 19B extending from the holder base region 16B toward the light emitting surface side and having a reflecting portion 11 provided on a slope facing the lens 30B on the light emitting surface side. Here, the angle (inclination) of the reflecting surface may be set so that the intensity of the reflected light from the lens 30B to the window portion 51B is maximized.

Further, a control circuit (not shown) is connected to the LED unit 20, and the control circuit controls the light emission timing, light emission time, and the like of each of the plurality of LED units 20.

Here, as shown in FIG. 10, the lens 30B mounted on the vehicle light emitting device 1B according to the third embodiment is the lens 30 mounted on the vehicle light emitting device 1 according to the first embodiment. The lens body portion 31 (31B) and the notch portion 32 (32B) are different in R shape. That is, in the third embodiment, the curvature of the lens body 31B is larger than the curvature of the lens body 31 in the first embodiment, and in the third embodiment, the notch 32B The curvature is smaller than the curvature of the notch 32 in the first embodiment. By adjusting the R shape of the lens in this way, as shown in FIGS. 12 and 13, the diffusion mode of the light from the lens can be adjusted and the brightness pattern can be changed.

FIG. 12 shows the luminance characteristics of the single light emitting unit 100B according to the third embodiment. FIG. 12 shows the relationship between the position of the light emitting surface on the front side of the single light emitting unit 100B (that is, the position of the light emitting surface in the width direction) and the brightness. As shown in FIG. 12, in the light emitting unit 100B, a gentle luminance peak exists at a position passing through the center of the notch 32 from the LED unit 20 as compared with the light emitting unit 100 according to the first embodiment. .. That is, the lens 30B according to the third embodiment emits diffused light having less brightness unevenness than the lens 30 according to the first embodiment.

Further, FIG. 13 shows the luminance characteristics when the plurality of light emitting units 100B according to the third embodiment are arranged at a predetermined arrangement interval (d). FIG. 13 shows the relationship between the position of the light emitting surface on the front side of the plurality of light emitting units 100B (that is, the position of the light emitting surface in the width direction) and the brightness. As shown in FIG. 13, by adjusting the arrangement interval of the light emitting unit 100B, a peak of brightness also exists between the positions facing the light emitting unit 100B. By adjusting the arrangement interval of the light emitting unit 100B in this way and allowing a peak to exist between the positions facing the light emitting unit 100B on the light emitting surface, it is possible to reduce the uneven brightness on the light emitting surface.

As described above, with respect to the light emitting unit mounted on the vehicle light emitting device, the diffusion mode of the light from the lens is changed by changing the R shape of the lens that diffuses the light incident from the LED unit. .. For example, in the vehicle light emitting device 1 according to the first embodiment, since the light emitting unit is miniaturized by making the curvature of the outer circumference of the lens smaller than that of the lens in the third embodiment, the light emitting unit is mounted. It is possible to reduce the size of the light emitting device for vehicles. By setting the R shape of the lens in this way, it is possible to make the vehicle light emitting device that suppresses the unevenness of the brightness correspond to the size of the space required by the vehicle.

In the above, the vehicle light emitting device according to the first to third embodiments according to the present invention has been mainly described. However, the above-described embodiment is merely an example for facilitating the understanding of the present invention, and does not limit the present invention. The present invention can be modified and improved without departing from the spirit thereof, and it goes without saying that the present invention includes an equivalent thereof.

1,1A, 1B Vehicle light emitting device 10, 10A, 10B Holder 11 Reflecting part 12 Convex part 13 Flat part 14, 15 Insertion hole 16, 16A, 16B Holder base area 17, 17B LED mounting area 18 Lens fixing area 19, 19B Reflection part formation area 20 LED part 30, 30B Lens 31, 31B Lens body part 32, 32B Notch part 33 Light source introduction part 34 Mounting structure part 35 Locking claw part 36 Rib 37 Connecting part 50, 50A, 50B Cover 51, 51A , 51B Window 60 Recess 100, 100B Light emitting unit 101 Light emitting unit group

Claims (10)

A plurality of light emitting units including a light source and a lens that diffuses and emits light incident from the light source are arranged side by side.
A vehicle light emitting device, characterized in that one or more peak values of brightness are also present between the plurality of light emitting units. The light emitted from the lens of the light emitting unit has a plurality of luminance peaks with respect to the spreading direction of the light.
The first aspect of the present invention, wherein the arrangement intervals of the plurality of light emitting units are set so that the plurality of brightness peaks of the light emitted from the plurality of light emitting units are arranged at substantially equal intervals. Luminous device for vehicles. A holding unit for holding the plurality of light emitting units is provided.
The vehicle light emitting device according to claim 1 or 2, wherein the holding portion has a reflecting portion that reflects light emitted from the lens toward a light emitting surface. The vehicle light emitting device according to claim 3, wherein the reflecting portion has a convex portion formed at a position facing the light source. The vehicle light emitting device according to claim 3 or 4, wherein the holding portion has a recess formed between the regions for holding the plurality of light emitting units. A cover that engages with the holding portion and covers the plurality of light emitting units is provided.
The vehicle light emitting device according to any one of claims 3 to 5, wherein the cover has a shape at which the distance from the lens is closest to the end of the lens on the light emitting side. .. The vehicle light emitting device according to any one of claims 3 to 6, wherein the lens has locking claws at both ends and is snap-fixed to the holding portion by the locking claws. .. The vehicle light emitting device according to any one of claims 3 to 7, wherein the lens is formed with ribs that regulate rotation with respect to the holding portion. The vehicle light emitting device according to any one of claims 1 to 8, wherein the lens has a notch formed at a position facing the light source. The vehicle light emitting device according to claim 9, wherein the lens is provided on both sides of the notch and has a light source introduction portion protruding toward the light source side.

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