JP6652880B2 - Lamp - Google Patents

Description

  The present invention relates to a lamp.

  Patent Literature 1 describes a lamp including a light guide that reflects and refracts light incident from an LED light source to form a predetermined light emitting shape.

JP 2015-167124 A

  In the conventional lamp, it was necessary to use a plurality of light guides in combination in order to realize a complicated light emitting shape. In this case, there is a problem that light passing through the light guide leaks to the adjacent light guide (leakage occurs), and an unintended region emits light.

  The present invention has been proposed in view of such a problem, and an object of the present invention is to provide a lamp that realizes various light emission shapes and suppresses light emission in an unintended area due to leaked light.

  A lamp according to one embodiment of the present invention includes a light guide in which a plate-shaped first light guide and a plate-shaped second light guide are integrally connected to each other, and light is applied to the first light guide. And a second light source that causes light to enter the second light guide unit, wherein the first light guide unit internally reflects the incident light, A first emission portion extending in a first direction and emitting light internally reflected by the reflection surface, wherein the second light guide portion is arranged in a second direction intersecting the first direction. A second light-emitting portion that extends, the first and second light-emitting portions emit light in a common light-emitting direction, and the second light-guiding portion faces the reflection surface of the first light-guiding portion. The incident part of the light part is located rearward in the emission direction.

According to the above configuration, the first and second emission units that intersect each other can emit light. Further, by turning on and off the respective light sources, various light emitting patterns such as a linear shape extending in one direction and a cross shape can be formed.
Further, according to the above configuration, the incident portion of the second light guide portion is located behind the reflection surface of the first light guide portion, so that the first light guide portion, the second light guide portion, Can be made smaller. This can prevent light from leaking from one of the first and second light guides to the other. Further, when mounting the second light source on the substrate, the substrate can be located behind the second light guide. Therefore, when a plurality of second light guides are provided, a plurality of second light sources can be mounted on the same substrate, and the number of components can be reduced, and an inexpensive lamp can be provided.

  Further, in the lamp, the second emission portion may be located rearward in the emission direction with respect to the first emission portion.

  According to the above configuration, light that passes through the inside of the first light guide is hard to be emitted from the second emission unit. That is, when the first light source is turned on and the second light source is turned off, only the first emission unit can emit light, and the emission of the second emission unit can be suppressed.

  Further, in the lamp, the first and second light sources may be mounted on the same substrate, and the incident portions of the first and second light guides may face in the same direction.

  According to the above configuration, since the first and second light sources can be arranged on the same substrate, the number of substrates can be reduced and an inexpensive lamp can be provided.

  Further, in the lamp, one or both of the first and second light guides may be configured such that a plate thickness is partially thin at a connection part between the first and second light guides.

  According to the above configuration, by reducing the size of the connection portion, it is possible to suppress light from leaking from one of the first and second light guide portions to the other.

  According to the present invention, it is possible to provide a lamp that realizes various light emission shapes and suppresses light emission in an unintended area due to leak light.

FIG. 2 is a front view of the lamp of the first embodiment. FIG. 2 is a sectional view taken along the line II-II in FIG. 1. FIG. 3 is a sectional view taken along the line III-III in FIG. 1. FIG. 6 is a cross-sectional view showing a second light guide section of Modification 1 and Modification 2 that can be used for the lamp of the first embodiment. The front view of the lighting fixture of 2nd Embodiment. The front view of the lamp of a 3rd embodiment. FIG. 7 is a sectional view taken along the line VII-VII in FIG. 6.

Hereinafter, the lamp of the embodiment will be described with reference to the drawings.
In addition, in the drawings used in the following description, in order to make the characteristics easy to understand, the characteristic portions may be enlarged for convenience, and the dimensional ratios and the like of the respective components are not necessarily the same as the actual ones. Absent.
In the drawings, an XYZ coordinate system is appropriately shown as a three-dimensional orthogonal coordinate system.

<First embodiment>
FIG. 1 is a front view of the lamp 1 of the first embodiment, FIG. 2 is a sectional view taken along the line II-II of FIG. 1, and FIG. 3 is a sectional view taken along the line III-III of FIG. .
The lamp 1 is mounted on a vehicle, for example, and can be used as a turn lamp, a tail lamp, or a stop lamp. In addition, the lamp 1 may be used as interior lighting or air conditioner panel lighting in a vehicle. Further, the lamp 1 may be used as an indicator and decorative lighting of a copier, a multifunction peripheral, and a game machine.

The lamp 1 includes a first light source unit 17 on which four first LED light sources (first light sources) 18 are mounted, and a second light source unit 17 on which three second LED light sources (second light sources) 28 are mounted. And a light guide 2 for irradiating light emitted from the first and second LED light sources 18 and 28 forward (in the + Y direction).
Hereinafter, each part will be described more specifically. In this specification, the direction in which light is irradiated (ie, the + Y direction) in a horizontal plane (XY plane) is defined as the front, and the opposite direction (ie, the −Y direction) is defined as the rear. Further, a direction (± X-axis direction) orthogonal to the light irradiation direction in the horizontal plane is defined as a left-right direction. Further, the vertical direction (Z-axis direction) is defined as the up-down direction.

<First light source unit>
The first light source unit 17 has a circuit board (substrate) 19 and four first LED light sources 18 mounted on the circuit board 19. The circuit board 19 is located above the light guide 2. The circuit board 19 is arranged in parallel with the horizontal plane. The four first LED light sources 18 are linearly arranged in the left-right direction (X-axis direction) of the lamp 1. The first LED light source 18 emits light downward.

<Second light source unit>
The second light source unit 27 includes a circuit board (substrate) 29 and three second LED light sources 28 mounted on the circuit board 29. The circuit board 29 is located behind the light guide 2. The circuit board 29 is arranged in a direction orthogonal to the horizontal plane. The circuit board 29 has the surface on which the second LED light source 28 is mounted facing forward. The second LED light source 28 emits light forward.

<Light guide>
The light guide 2 is made of, for example, a transparent resin material such as acrylic. The light guide 2 is configured such that four first light guides 10 and three second light guides 20 are integrally connected. The first light guide 10 and the second light guide 20 are arranged in order in the horizontal direction. That is, the second light guide 20 is disposed between the pair of first light guides 10. A connection part 3 is formed at a boundary between the first light guide part 10 and the second light guide part 20.

<First Light Guide>
The first light guide 10 has a plate shape extending in the up-down direction (first direction). As shown in FIG. 3, the first light guide unit 10 includes an incident unit 11, a reflection surface 12, and a first emission surface (first emission unit) 13. The entrance 11, the reflection surface 12, and the first emission surface 13 are respectively located on the outer peripheral surface of the first light guide 10 orthogonal to the thickness direction.

  The entrance 11 of the first light guide 10 is located on the upper surface of the first light guide 10. The incident section 11 faces the first LED light source 18. The light emitted from the first LED light source 18 enters the inside of the first light guide 10 from the entrance 11.

  The reflection surface 12 of the first light guide 10 is a paraboloid that is convex rearward. The plane direction of the reflection surface 12 faces rearward and downward of the first light guide unit 10. Light that has entered the first light guide unit 10 via the incident unit 11 enters the reflection surface 12. The reflection surface 12 internally reflects light (total reflection) and emits light forward as parallel light (parallel light) when viewed from the left and right directions.

  The first exit surface 13 of the first light guide 10 causes the parallel light reflected by the reflection surface 12 to exit from the first light guide 10. The first emission surface 13 is formed in a plane shape orthogonal to the traveling direction of the parallel light. The first emission surface 13 faces forward. The first emission surface 13 extends in the up-down direction (first direction).

<Second light guide section>
The second light guide unit 20 has a plate shape extending in the left-right direction (second direction). As shown in FIG. 2, the second light guide 20 has an incident part 21, a reflection surface 22, and a second emission surface (second emission part) 23. The entrance 21, the reflection surface 22, and the second exit surface 23 are respectively located on the outer peripheral surface of the second light guide 20 that is orthogonal to the thickness direction.

  The incident portion 21 of the second light guide 20 is located on the rear surface of the second light guide 20. The incident part 21 faces the second LED light source 28. The light emitted from the second LED light source 28 enters the inside of the second light guide unit 20 from the incidence unit 21.

  The incident portion 21 of the second light guide 20 has a central incident surface 21a and a peripheral incident surface 21b. The central incident surface 21a and the peripheral incident surface 21b have a uniform shape in the thickness direction. The optical axis J28 of the second LED light source 28 passes through the central incident surface 21a. The central incident surface 21a has a parabolic shape centered on the optical axis J28 of the second LED light source 28. The peripheral incident surface 21b is located on both left and right sides with respect to the central incident surface 21a and is formed symmetrically. The peripheral incident surface 21b has a flat surface inclined with respect to the optical axis J28.

Of the light emitted from the second LED light source 28, light having a relatively small emission angle is incident on the central incident surface 21a. The focal point of the central incident surface 21a substantially coincides with the center of the second LED light source 28. For this reason, the central incident surface 21a refracts the incident light so as to be substantially parallel light. That is, the central incident surface 21a emits the incident light forward as parallel light.
On the other hand, of the light emitted from the second LED light source 28, light having a relatively large emission angle is incident on the peripheral incident surface 21b. Light incident from the peripheral incident surface 21 b enters the reflecting surface 22.

  The reflection surfaces 22 of the second light guide section 20 are located on both sides in the left-right direction of the incident section 21 and are formed symmetrically. The reflection surface 22 has a parabolic shape centered on the optical axis J28 of the second LED light source 28. Light that has entered the inside of the second light guide unit 20 enters the reflection surface 22 via the peripheral incident surface 21b. The reflection surface 22 reflects light internally (total reflection) and emits light forward as parallel light (parallel light) as viewed from above and below.

  The second emission surface 23 of the second light guide 20 causes the parallel light reflected by the reflection surface 22 to be emitted from the second light guide 20. The second emission surface 23 is formed in a plane shape orthogonal to the traveling direction of the parallel light. The second emission surface 23 faces forward. The second emission surface 23 extends in the left-right direction (second direction). Note that the direction in which the second emission surface 23 extends (the second direction) may not be orthogonal as long as it intersects with the direction in which the first emission surface 13 extends (the first direction). The second emission surface 23 emits light in the same emission direction as the first emission surface 13.

Next, the positional relationship between the first and second light guide units 10 and 20 in the front-rear direction will be described.
As shown in FIGS. 2 and 3, the second emission surface 23 is located behind the first emission surface 13 in the emission direction. For this reason, light that passes through the inside of the first light guide unit 10 is hardly emitted from the second emission surface 23. That is, when the first LED light source 18 is turned on and the second LED light source 28 is turned off, only the first emission surface 13 can emit light, and the emission of the second emission surface 23 can be suppressed.

  The incident section 21 of the second light guide section 20 is located rearward in the emission direction with respect to the reflection surface 12 of the first light guide section 10. For this reason, it is possible to reduce the size of the connection portion 3 between the first and second light guide portions 10 and 20. This makes it difficult for light to leak from the first light guide 10 to the second light guide 20. Similarly, light is less likely to leak from the second light guide 20 to the first light guide 10. Generally, when the two light guides are integrated, the light guide (the second light guide 20 in the present embodiment) having the light exit surface located rearward from the light guide (the light guide having the light exit surface located forward). Light easily leaks to the first light guide portion 10) in the present embodiment (that is, light leaks easily). Reducing the size of the connection part 3 means that the path of light between the first light guide part 10 and the second light guide part 20 is narrowed. Therefore, by reducing the size of the connection portion 3, it is possible to suppress light leakage. Here, “the connection portion 3 is small” means that the first light guide portion 10 and the second light guide portion 20 overlap when viewed from the left and right direction (that is, when viewed from the X axis direction). It means that the cross-sectional area of the connecting portion 3 formed at the position is small.

  Further, the incident part 21 of the second light guide part 20 is located behind the reflection surface 12 of the first light guide part 10 in the emission direction. For this reason, when a plurality of second light source units 27 are mounted on the second light source unit 27 located behind the second light guide unit 20, the circuit board 29 is arranged in a series along the left-right direction. can do. Thereby, the number of parts can be reduced and the inexpensive lamp 1 can be configured.

  According to the lamp 1 of the present embodiment, the first and second emission surfaces 13 and 23 extending in the vertical direction (first direction) and the horizontal direction (second direction) can emit light, respectively. Also, various light emission patterns can be formed by turning on and off the respective light sources. In addition, two types of lamps having different light emission patterns may be provided when only the first LED light source 18 is mounted and when only the second LED light source 28 is mounted. In this case, since the same light guide 2 can be used, an inexpensive lamp can be provided by sharing parts.

<Modification>
FIG. 4 shows a second light guide 20A of the first modification and a second light guide 20B of the second modification that can be employed in the lamp 1 of the first embodiment. Note that the same reference numerals are given to the same components as those in the above-described embodiment, and the description thereof will be omitted.
The second light guides 20A and 20B of Modifications 1 and 2 are different in position with respect to the first light guide 10 from the second light guide 20 of the first embodiment. The second light guide sections 20A and 20B are connected to the first light guide section 10 at connection sections 3A and 3B, respectively. The second light guides 20 </ b> A and 20 </ b> B of Modifications 1 and 2 are arranged along the reflection surface 12 of the first light guide 10. The upper surface of the second light guide 20 </ b> A of the first modification is substantially the same as the upper surface of the first light guide 10. The second light exit surface 23B of the second light guide unit 20B of Modification 2 substantially matches the first light exit surface 13 of the first light guide unit 10.

In the second light guide sections 20A and 20B of Modifications 1 and 2, the connection sections 3A and 3B with the first light guide section 10 are arranged along the reflection surface 12 of the first light guide section 10. I have.
Similarly to the second light guide section 20 of the first embodiment, the incident sections 21A and 21B of the second light guide sections 20A and 20B of Modifications 1 and 2 are connected to the reflection surface 12 of the first light guide section 10. With respect to the emission direction. This makes it possible to reduce the size of the connection portions 3A and 3B, narrow the path of light between the second light guide portions 20A and 20B and the first light guide portion 10, and suppress leakage light.

<Second embodiment>
FIG. 5 is a front view of the lamp 101 of the second embodiment.
The lamp 101 of the second embodiment is different from the first embodiment in the configuration of the second light guide 120 near the connection portion 103. Note that the same reference numerals are given to the same components as those in the above-described embodiment, and the description thereof will be omitted.

  The lamp 101 of the second embodiment irradiates the light emitted from the first light source unit 17, the second light source unit 27, and the light emitted from the first and second light source units 17, 27 forward (in the + Y direction). A light guide 102.

  The light guide 102 is configured such that four first light guides 110 and three second light guides 120 are integrally connected. The first light guide 110 has a plate shape extending in the vertical direction. The second light guide 120 has a plate shape extending in the left-right direction (second direction). The first and second light guides 110 and 120 have an incident part, a reflection surface, and an emission surface as in the first embodiment. The first light guide 110 and the second light guide 120 are arranged in order in the horizontal direction. At a boundary between the first light guide unit 110 and the second light guide unit 120, a connection unit 103 is formed.

  On both upper and lower surfaces of the second light guide unit 120, inclined surfaces are provided at both ends in the left-right direction, which are inclined in a direction in which the plate thickness becomes thinner. That is, the second light guide section 120 is provided with the thin section 125 whose thickness is partially reduced at the connection section 103 with the first light guide section 110.

In the lamp 101 of the present embodiment, the connection portion 103 can be made smaller because the plate thickness of the second light guide 120 is partially reduced in the connection portion 103. Thereby, the path of the light between the first light guide 110 and the second light guide 120 can be narrowed, and the leakage light can be suppressed.
Note that the present embodiment has exemplified the case where the plate thickness of the second light guide unit 120 in the connection unit 103 is reduced. Even if the plate thickness of the first light guide section 110 in the connection section 103 is small, a certain effect of suppressing leaked light can be achieved.

<Third embodiment>
FIG. 6 is a front view of a lamp 201 according to the third embodiment. FIG. 7 is a sectional view taken along the line VII-VII in FIG.
In the lamp 201 of the third embodiment, the direction of the incident portion 221 of the second light guide 220 is mainly different from that of the first embodiment.

  The light source unit 217 includes a circuit board (board) 219, four first LED light sources 218 mounted on the circuit board 219, and three second LED light sources 228 mounted on the circuit board 219. Have. The circuit board 219 is arranged parallel to the horizontal plane. The four first LED light sources 218 and the second LED light sources 228 are linearly arranged in the left-right direction (X-axis direction) of the lamp 201. As shown in FIG. 7, the second LED light source 228 is arranged rearward with respect to the first LED light source 218.

  The light guide 202 is configured such that four first light guides 210 and three second light guides 220 are integrally connected. The first light guide 210 has a plate shape extending in the up-down direction. Further, the second light guide section 220 has a plate shape extending in the left-right direction (second direction). The first light guide 210 and the second light guide 220 are arranged in order in the horizontal direction. At a boundary between the first light guide 210 and the second light guide 220, a connection portion 203 is formed.

  The first light guide section 210 has substantially the same configuration as the first light guide section 10 of the first embodiment, and includes an entrance section 211, a reflection surface 212, and a first exit surface (first exit section) 213. Having. The first light guide unit 210 irradiates the light emitted from the first LED light source 218 forward.

  A lens body 211a is formed on the incident part 211 of the first light guide 210. The lens body 211a has a uniform shape along the front-back direction. The lens body 211a converts light incident from the first LED light source 218 into light parallel to a vertical plane (that is, a YZ plane) along the front-rear direction.

  The second light guide 220 irradiates the light emitted from the second LED light source 228 forward. As shown in FIG. 7, the second light guide 220 includes an incident part 221, a primary reflection surface 224, a secondary reflection surface 222, and a second emission surface (second emission part) 223. The incident part 221 and the secondary reflection surface 222 are formed in the second light guide part 220 as a part of the outer peripheral surface of the plate part 220a extending in the left-right direction (second direction). The primary reflection surface 224 is located at the rear of the plate portion 222a, and the incident portion 221 is formed to protrude upward from the primary reflection surface 224.

  The incident section 221 of the second light guide section 220 faces the second LED light source 228. The light emitted from the second LED light source 228 enters the inside of the second light guide 220 from the entrance 221. The incidence part 221 has a lens body 221a formed thereon. The lens body 221a has a uniform shape along the left-right direction. The lens body 221a converts light incident from the second LED light source 228 into light parallel to a vertical plane (that is, an XZ plane) along the left-right direction.

  The primary reflection surface 224 of the second light guide 220 is a flat surface that is inclined to face rearward and downward. The primary reflection surface 224 refracts light incident from the incident part 221 and directs the light forward. The light reflected by the primary reflection surface 224 becomes light parallel to a horizontal plane (that is, an XY plane).

  The secondary reflection surface 222 of the second light guide 220 has substantially the same configuration as the reflection surface 22 of the second light guide 20 of the first embodiment. That is, the second light guide section 220 has a parabolic shape as viewed from the up and down direction, and emits the reflected light forward as parallel light.

  The second emission surface 223 is located rearward of the first emission surface 213 in the emission direction. Further, the incident part 221 of the second light guide part 220 is located behind the reflection surface 212 of the first light guide part 210 in the emission direction. Therefore, the lamp 201 of the present embodiment reduces the size of the connecting portion 203 by the same operation as that of the first embodiment to reduce the leakage light between the first light guiding portion 210 and the second light guiding portion 220. Can be suppressed.

  According to the lamp 201 of the present embodiment, the incident portions 211 and 221 of the first and second light guide portions 210 and 220 face in the same direction. Thus, the first and second LED light sources 218 and 228 can be mounted on the same circuit board, and the inexpensive lamp 201 can be provided by reducing the number of components.

As described above, various embodiments of the present invention and the modifications thereof have been described. However, each configuration and the combination thereof in each embodiment and the modifications are only examples, and do not depart from the gist of the present invention. Configuration additions, omissions, substitutions, and other changes are possible. The present invention is not limited by the embodiments.
For example, the first and second emission surfaces (the first and second emission portions) of the above-described embodiment are flat surfaces, but may be curved surfaces such as paraboloids, and prisms are formed on the surfaces. It may be formed.

  1, 101, 201 ... lamp, 2, 102, 202 ... light guide, 3, 3A, 3B, 103, 203 ... connection part, 10, 110, 210 ... first light guide, 20, 20A, 20B, 120, 220 ... second light guide section, 11, 21, 21A, 21B, 211, 221 ... entrance section, 12, 22, 212, 222, 224 ... reflection face, 13, 213 ... first emission face (first 1, 23, 223... Second emission surface (second emission portion), 19, 29, 219. Circuit board (substrate)

Claims (4)

A light guide in which a plate-shaped first light guide and a plate-shaped second light guide are integrally connected;
A first light source that causes light to enter the first light guide unit;
A second light source that makes light incident on the second light guide unit,
The first light guide unit has a reflection surface that internally reflects incident light, and a first emission unit that extends in a first direction and emits light that is internally reflected by the reflection surface,
The second light guide unit has a second emission unit extending in a second direction that intersects the first direction,
The first and second emission units emit light in a common emission direction,
A lamp in which an incident portion of the second light guide is positioned rearward in an emission direction with respect to a reflection surface of the first light guide. With respect to the first emission unit, the second emission unit is located rearward in the emission direction.
The lamp according to claim 1. The first and second light sources are mounted on the same substrate,
The incident portions of the first and second light guide portions face in the same direction,
The lamp according to claim 1. Either one or both of the first and second light guides have a partially reduced thickness at a connection part between them.
The lamp according to claim 1.

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