JP2015018668A - Lighting fixture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the appearance during a non-lighting period.SOLUTION: A lighting fixture 1 comprises a light guide plate 2 and LED 3 arranged at the end of the light guide plate 2, and makes light emitted from the LED 3 and entered the light guide plate 2 from the end emit from a front surface 23 of the light guide plate 2. Multiple lens cuts 240, ... making the light guided along in the light guide plate 2 reflect to the front surface 23 are provided in parallel on a rear surface 24 of the light guide plate 2. The multiple lens cuts 240, ... are smoothly continued with neighboring lens cuts or flat parts of the light guide plate at rounded parts Ra, and the size of the lens cuts of the light guide plate 2 are shaped minutely.

Description

  The present invention relates to a lamp, and more particularly to a lamp including a light guide plate.

  Conventionally, a lamp that emits light from a long light guide plate over its entire length is known (see, for example, Patent Document 1). In this type of lamp, light from light sources arranged at both ends in the longitudinal direction of the light guide plate is incident on the light guide plate from both ends and guided along the longitudinal direction, and formed on the rear surface of the light guide plate. The front surface of the light guide plate is caused to emit light by being internally reflected by the cut-out lens cut and emitted from the front surface.

JP 2009-199913 A

  However, in the conventional lamp, the lens cut formed on the rear surface of the light guide plate is a simple mountain cut, so when the light guide plate is viewed from the front (front) when not lit, the lens cut on the rear surface is not performed. The edge lines of the mountains and valleys were conspicuous, and the appearance was not transparent.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a lamp that emits light from a light guide plate and has a good appearance when not lit.

In order to solve the above-mentioned problem, the invention described in claim 1
A light guide plate;
A light source disposed at an end of the light guide plate;
In the lamp that emits light emitted from the light source and incident on the light guide plate from the end portion, from the front surface of the light guide plate,
On the rear surface of the light guide plate, a plurality of lens cuts for reflecting the light guided in front of the light guide plate to the front surface is applied to at least a part,
The plurality of lens cuts are smoothly connected to the adjacent lens cuts or the planar portion and the R portion of the light guide plate, and the size of the cuts is finely formed.

The invention according to claim 2 is the lamp according to claim 1,
The plurality of lens cuts are characterized in that an R portion is formed at each peak and each surface of the lens cut is smoothly connected.

The invention according to claim 3 is the lamp according to claim 1 or 2,
The height of the cut is 0.1 mm or less.

The invention according to claim 4 is the lamp according to any one of claims 1 to 3,
Each of the plurality of lens cuts is substantially a prism cut, and one of the prism surfaces forms an angle of 27 ° to 29 ° with the front surface of the light guide plate, and the other prism surface has a front surface of the light guide plate of 72 ° to 72 °. It is characterized by an angle of 78 °.

Invention of Claim 5 is a lamp | ramp as described in any one of Claims 1-4,
A plurality of the light guide plates are arranged to overlap each other.

  According to the first aspect of the present invention, the plurality of lens cuts formed on the rear surface of the light guide plate are smoothly connected to the adjacent lens cuts or the flat portion and the R portion of the light guide plate. Unlike the conventional case where the light guide plate is viewed from the front when not lit, the edge lines of the valley portions of the plurality of lens cuts do not stand out, unlike the conventional case where the light is formed in a simple mountain shape. Accordingly, the appearance when the light guide plate is viewed from the front when not lit can be made transparent and good.

  Moreover, since the size of the plurality of lens cuts is finely formed, the cut height of the lens cuts is reduced, and as a result, the thickness of the light guide plate can be reduced. Therefore, the appearance when the light guide plate is viewed from the front when not lit can be made more transparent.

  According to the second aspect of the present invention, since the plurality of lens cuts are formed with the R portions at the respective crests and the surfaces of the lens cuts are smoothly connected, the lens cuts are simple ridge cuts. Unlike the conventional case where the light guide plate is not lit, the edge lines of the crests of the plurality of lens cuts do not stand out when the light guide plate is viewed from the front. Therefore, the appearance when the light guide plate is viewed from the front when not lit can be made more transparent.

It is a front view of the lamp in embodiment. It is sectional drawing in the II-II line of FIG. It is an enlarged view of the A section of FIG. It is an enlarged view of the B section of FIG. It is sectional drawing in the III-III line of FIG. It is an expanded sectional view of the lens cut in an embodiment. It is a figure which shows the light ray locus | trajectory of the light from 1st LED in embodiment. It is a figure which shows the light ray locus | trajectory of the light from 2nd LED in embodiment. It is a front view which shows the light-guide plate and lamp in other embodiment. It is sectional drawing in the BB line of FIG.9 (d). It is the vertical and horizontal sectional view of the A section covered with the dotted line of FIG.9 (b).

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a front (front) view of the lamp 1 in the present embodiment, FIG. 2 is a cross-sectional view taken along the line II-II in FIG. 1, and FIGS. FIG. 5 is an enlarged view of part B, and FIG. 5 is a sectional view taken along line III-III in FIG.
In the following description, the descriptions “front”, “rear”, “left”, “right”, “upper”, and “lower” refer to directions seen from the lamp 1.

  As shown in FIGS. 1 and 2, the lamp 1 is disposed in a headlamp 10 mounted on the front left side of a vehicle (not shown), and includes a long light guide plate 2, two LEDs 3 and 4, It has.

  The light guide plate 2 is arranged in a state extending substantially along a direction inclined obliquely with respect to the front-rear direction so as to follow the outer lens 11 on the front surface of the headlamp 10 in a plane substantially orthogonal to the vertical direction. Yes. More specifically, in this embodiment, the light guide plate 2 is inclined at an inclination angle of about 50 ° with respect to the left-right direction from the rear end portion 21 on the rear side in the longitudinal direction toward the front end portion 22 on the front side in the longitudinal direction. It extends slightly along the direction inclined toward the vehicle inner side) and is slightly curved backward from the front end portion 22 toward the rear end portion 21.

  As shown in FIG. 3, in the vicinity of the rear end portion 21 of the light guide plate 2, the first LED 3 of the two LEDs 3 and 4 is disposed so as to face the rear end portion 21. The first LED 3 is mounted on the substrate 32 fixed to the heat sink 31 with its optical axis Ax1 directed obliquely rightward and forward at an angle of about 55 ° with respect to the left-right direction.

The rear end portion 21 of the light guide plate 2 is formed with a light incident portion 210 that allows the light emitted from the first LED 3 to enter the light guide plate 2 while condensing the light toward the optical axis Ax1. The light incident part 210 has a first incident surface 211, a second incident surface 212, and a reflecting surface 213.
Among these, the 1st entrance plane 211 is formed in the convex surface shape which bulges to the 1st LED3 side by making optical axis Ax1 into a rotational symmetry axis, and is arrange | positioned so that 1st LED3 may be located in the focus. The first incident surface 211 allows the light emitted from the first LED 3 to enter the light guide plate 2 while being refracted toward the optical axis Ax1.
The second incident surface 212 is a substantially cylindrical surface erected from the peripheral edge of the first incident surface 211 toward the first LED 3 side. The second incident surface 212 allows light emitted from the first LED 3 to enter the light guide plate 2 with an emission angle larger than that incident on the first incident surface 211.
The reflecting surface 213 is a truncated conical surface inclined so as to spread outward from the tip of the second incident surface 212 toward the optical axis Ax1 (side away from the optical axis Ax1), and is guided from the second incident surface 212. The light incident into the optical plate 2 is internally reflected (totally reflected) so as to substantially follow the optical axis Ax1. The rear end portion 21 of the light guide plate 2 is supported by the extension 12 with the first incident surface 211 and the second incident surface 212 exposed to the first LED 3 side.

  As shown in FIG. 4, in the vicinity of the front end portion 22 of the light guide plate 2, the second LED 4 of the two LEDs 3 and 4 is slightly more than on the straight extension line connecting the front end portion 22 and the rear end portion 21. It is arranged at the rear. The second LED 4 is mounted on the substrate 42 fixed to the heat sink 41 with the optical axis Ax2 directed obliquely leftward and rearward at an angle of about 43 ° with respect to the left-right direction.

At the front end portion 22 of the light guide plate 2, a light collecting portion 220 that condenses the light emitted from the second LED 4 within a predetermined angle range protrudes rearward from the front end portion 22 so as to face the second LED 4. It is installed. The condensing unit 220 includes a first incident surface 221, a second incident surface 222, a reflecting surface 223, and an exit surface 224.
Among these, the first incident surface 221, the second incident surface 222, and the reflecting surface 223 are formed such that the optical axis Ax2 is a rotationally symmetric axis while facing the second LED 4, and the other points are described above. It is formed in the same manner as the first incident surface 211, the second incident surface 212, and the reflecting surface 213 of the light incident portion 210.
The exit surface 224 is a surface on the opposite side to the second LED 4 side in which the first incident surface 221, the second incident surface 222, and the reflection surface 223 are formed in the light collecting unit 220, and is substantially orthogonal to the optical axis Ax <b> 2. doing. The exit surface 224 emits the light emitted from the second LED 4 and condensed toward the optical axis Ax2 through the first entrance surface 221, the second entrance surface 222, and the reflection surface 223 in an angle range of about 18 °. Let As will be described later, the angular range of the emitted light is a range in which the emitted light is irradiated on the rear surface 24 of the light guide plate 2 over substantially the entire length. More specifically, the angle range is a range of light emitted from the emission surface 224 through the first incident surface 221. Therefore, of the light emitted from the second LED 4, stronger light around the optical axis Ax <b> 2 is irradiated on the rear surface 24 of the light guide plate 2 over substantially the entire length.
Further, a locking portion 225 that protrudes rearward is provided at the front end (rear end) of the light collecting portion 220, and the locking portion 225 is locked to the bracket 13.

As shown in FIGS. 2 and 5, the light guide plate 2 has a cross-sectional shape orthogonal to the longitudinal direction formed in a substantially parallelogram shape, and has a front surface 23 and a rear surface 24 substantially along the vertical direction.
Among these, the front surface 23 is formed in the shape of a long curved plane covering substantially the entire length of the light guide plate 2, and, as will be described later, an emission surface that emits light from the first LED 3 and the second LED 4 forward, It has become.
On the other hand, the rear surface 24 is a surface opposite to the front surface 23 and is formed to be shorter in the vertical direction than the front surface 23, and is continuous with the front surface 23 via a tapered upper surface and lower surface. The thickness of the light guide plate 2 from the rear surface 24 to the front surface 23 gradually decreases from the rear end portion 21 toward the front end portion 22.
A plurality of lens cuts 240 arranged in parallel along the longitudinal direction of the light guide plate 2 are formed on the rear surface 24 over substantially the entire length of the rear surface 24.

FIG. 6 is an enlarged cross-sectional view of the lens cuts 240,.
As shown in this figure, the lens cuts 240,... Are formed in a plurality of substantially serrated shapes arranged side by side along the longitudinal direction of the light guide plate 2 (rear surface 24). Each lens cut 240 is a substantially prism cut formed in a uniform cross-sectional shape along the vertical direction, and the first prism surface 241 on the front side (right side) in the longitudinal direction of the light guide plate 2 and the longitudinal direction of the light guide plate 2. A second prism surface 242 on the rear side (left side).

Among these, the first prism surface 241 is a plane in which an angle θ1 formed with a straight line connecting the valleys on both sides of the lens cut 240 (a line parallel to the front surface 23 of the light guide plate 2) is within a range of 27 ° to 29 °. It is. More specifically, the angle θ1 is formed so as to increase as the first prism surface 241 on the rear side in the longitudinal direction of the light guide plate 2 increases.
On the other hand, the second prism surface 242 is a plane in which an angle θ2 formed with a straight line connecting the valleys on both sides of the lens cut 240 (a line parallel to the front surface 23 of the light guide plate 2) is within a range of 72 ° to 78 °. is there. More specifically, the angle θ2 is formed so as to increase as the second prism surface 242 on the rear side in the longitudinal direction of the light guide plate 2 increases.
By forming the first prism surface 241 and the second prism surface 242 in this way, the first prism surface 241 becomes a surface that is closer to parallel with the front surface 23 of the light guide plate 2, and the first prism surface occupying each lens cut 240. Since the area of 241 is larger, the lens cuts 240 can be made inconspicuous when the light guide plate 2 is viewed from the front when not lit.

  Each of the first prism surface 241 and the second prism surface 242 is formed in an R shape so as to be smoothly connected to adjacent ones. In other words, the lens cuts 240,... Have concave R portions Ra formed in the valleys between the adjacent ones, and are smoothly connected to the adjacent ones and the R portions Ra, and convex to the respective peak portions. R portion Rb is formed, and the first prism surface 241 and the second prism surface 242 of each lens cut 240 are smoothly connected. In this way, by providing the R portions Ra and Rb to the lens cuts 240,... And smoothly connecting the surfaces, the lens cuts 240,. When the light guide plate 2 is viewed from the front, the edge lines of the crests and troughs of the lens cuts 240,... Do not stand out, and a transparent appearance can be realized. In addition, when the lens cut 240 is given with an interval between the lens cuts 240,..., The flat surface of the light guide plate 2 and the lens cut 240 are formed in an R shape so as to be smoothly connected.

  Further, the lens cuts 240,... Have a fine cut pitch P with the adjacent ones. In this embodiment, the cut pitch P is formed to be 0.1 mm or less. Then, by forming the cut pitch P of the lens cuts 240,... Finely in this way, the cut height H of the lens cuts 240,... Is also reduced, and in this embodiment, the cut height H is 0. .1 mm or less. Therefore, compared with the case where the cut pitch P of the lens cuts 240,... Is formed in a general size (for example, 1 to 3 mm), the thickness of the light guide plate 2 can be reduced. A more transparent appearance can be realized when viewed from the front.

Then, the light emission aspect of the lamp 1 is demonstrated.
FIG. 7 is a diagram showing a ray trajectory of the light L1 from the first LED 3, and FIG. 8 is a diagram showing a ray trajectory of the light L2 from the second LED 4. As shown in FIG.

  As shown in FIG. 7, the light L1 emitted from the first LED 3 out of the two LEDs 3 and 4 is guided while being condensed toward the optical axis Ax1 through the light incident portion 210 formed at the rear end portion 21. The light enters the optical plate 2. The light L1 that has entered the light guide plate 2 is directly or internally reflected by the front surface 23 and indirectly guided from the rear end portion 21 toward the front end portion 22 in the light guide plate 2.

The light L1 guided through the light guide plate 2 is internally reflected forward by the lens cuts 240 formed on the rear surface 24. Specifically, as shown in FIG. 6, the light L <b> 1 is internally reflected forward by the base end side portion (the valley side portion of the lens cut 240) of the first prism surface 241 in the lens cut 240. . Of this light L1, the light that is internally reflected by the R portion Ra at the base end of the first prism surface 241 is internally reflected forward while being diffused in the left-right direction by the R portion Ra.
Then, the light L1 is emitted forward from the front surface 23, and the front surface 23 emits light forward.

At this time, since the thickness of the light guide plate 2 from the rear surface 24 to the front surface 23 is gradually reduced from the rear end portion 21 toward the front end portion 22, the light guide plate 2 is guided from the rear end portion 21. The light L <b> 1 is relatively easily guided to the back side (front end 22 side) of the curved light guide plate 2 while being internally reflected by the front surface 23.
Further, the light L1 guided in the light guide plate 2 has a shorter optical path length (light guide length) to the front surface 23 than light guided in the light guide plate having a constant thickness. The attenuation of the light L1 accompanying the light guide in the optical plate 2 is reduced.

  On the other hand, the light L2 emitted from the second LED 4 is irradiated on the rear surface 24 of the light guide plate 2 over substantially the entire length while being condensed near the optical axis Ax2 through the light collecting unit 220 as shown in FIG. The

The light L2 is internally reflected forward by the lens cuts 240 formed on the rear surface 24 while being incident on the light guide plate 2. Specifically, as shown in FIG. 6, the light L <b> 2 is refracted through the tip side portion (the mountain side portion of the lens cut 240) of the first prism surface 241 in the lens cut 240 and enters the light guide plate 2. After entering, the light is internally reflected forward by the second prism surface 242. Of the light L2 internally reflected by the second prism surface 242, the light reflected by the R portion Ra at the base end of the second prism surface 242 is internally reflected forward while being diffused in the left-right direction by the R portion Ra. Is done.
Then, the light L2 is emitted forward from the front surface 23, and the front surface 23 emits light forward.

  In this way, the lights L1 and L2 from the two LEDs 3 and 4 disposed in the vicinity of both ends in the longitudinal direction of the light guide plate 2 are emitted forward from the front surface 23 of the light guide plate 2, respectively. Strongly emits light forward.

As described above, according to the lamp 1, the plurality of lens cuts 240 formed on the rear surface 24 of the long light guide plate 2 are smoothly connected to the adjacent ones at the R portion Ra. However, unlike the conventional case where the light guide plate 2 is not lit, the edge lines of the valley portions of the plurality of lens cuts 240,... Do not stand out. Accordingly, the appearance when the light guide plate 2 is viewed from the front when not lit can be made transparent and good.
Furthermore, by realizing such a transparent appearance, it is possible to make it easier to visually recognize the configuration provided behind the light guide plate 2 (for example, the color and shape of a member different from the light guide plate 2) from the front. Therefore, the design freedom of the lamp 1 can be improved.

  Further, since the cut pitch P of the plurality of lens cuts 240,... Is finely formed, the cut height H of the lens cuts 240,. . Therefore, the appearance when the light guide plate 2 is viewed from the front when not lit can be made more transparent.

  Further, the cut pitch P of the plurality of lens cuts 240,... Is finely formed, and the light L1 and the light L2 can be diffused in the left-right direction by the R portion Ra of the valleys of the lens cuts 240,. Therefore, the front surface 23 of the light guide plate 2 can emit light uniformly.

  In addition, since the plurality of lens cuts 240,... Are formed with R portions Rb at their peak portions, the surfaces (the first prism surface 241 and the second prism surface 242) of the lens cut 240 are smoothly connected. Unlike the conventional case in which the lens cut is formed in a simple mountain shape, when the light guide plate 2 is viewed from the front when not lit, the edge lines of the mountain portions of the plurality of lens cuts 240,. . Therefore, the appearance when the light guide plate 2 is viewed from the front when not lit can be made more transparent.

Further, after the light L1 from the first LED 3 facing the rear end portion 21 of the light guide plate 2 enters the light guide plate 2 from the rear end portion 21, the lens cuts 240, ... formed on the rear surface 24 move forward. While internally reflected and emitted forward from the front surface 23, the light L2 from the second LED 4 disposed in the vicinity of the front end portion 22 of the light guide plate 2 is emitted toward the rear surface 24 of the light guide plate 2, and the rear surface 24 Are incident on the light guide plate 2 while being refracted by the lens cuts 240,..., And are internally reflected forward and emitted forward from the front surface 23. That is, the rear end of the light guide plate 2 is different from the case where light is incident on the long light guide plate extending along the direction inclined with respect to the front-rear direction, simply from both longitudinal end surfaces of the light guide plate. Not only the light from the first LED 3 disposed in the vicinity of the portion 21 but also the light L2 from the rearward second LED 4 disposed in the vicinity of the front end portion 22 of the light guide plate 2 is the front surface 23 of the light guide plate 2. Can be emitted forward.
Therefore, the light L1 from the two LEDs 3 and 4 in which the front surface 23 of the long light guide plate 2 extending along the direction inclined with respect to the front-rear direction is disposed in the vicinity of both ends in the longitudinal direction of the light guide plate 2. L2 can emit light forward.

  Further, in the lens cut 240, the base end side portion of the first prism surface 241 internally reflects light emitted from the first LED 3 and incident from the rear end portion 21 into the light guide plate 2 to the first prism surface 241. The tip side portion of 241 enters the light guide plate 2 while refracting the light emitted from the second LED 4, and the second prism surface 242 enters the light guide plate 2 from the tip side portion of the first prism surface 241. In other words, in the lens cut 240, a plurality of different portions (the base end side portion and the tip end side portion of the first prism surface 241 and the second prism surface 242) are independent from each other. Plays. Therefore, the plurality of parts can be optimally designed individually.

Next, another embodiment will be described with reference to FIGS.
FIG. 9 is a front (front) view of the light guide plate and lamp 1 according to another embodiment of the present invention, (a) is a front view of the first light guide plate 51, and (b) is a view of the second light guide plate 52. (C) is a front view of the 3rd light guide plate 53, (d) is a front view of the lamp | ramp which has arrange | positioned the 1st-3rd light guide plate. In practice, the light guide plates 51 to 53 and the LED 3 serving as the light source are housed in the housing and configured as the lamp 1, but the housing is not shown for convenience of explanation. 10 is a cross-sectional view of the lamp 1, FIG. 11A is an enlarged vertical cross-sectional view of a portion covered with a dotted line A in FIG. 9B, and FIG. 11B is a cross-sectional view.

  In the previous embodiment, an example of a parallelogram with a long light guide plate was shown, but the present invention is not limited to this, and is a non-long flat light guide plate described in the following embodiments. Also good. Further, in the previous embodiment, the example in which the lens cut 240 is formed over the entire length of the light guide plate has been shown. However, the present invention is not limited to this, and the lens cut 240 is provided in a part of the light guide plate described in the following embodiment. It may be.

  As shown in FIG. 10, the light guide plate 51 is disposed at the rearmost part of the lamp 1 in the front-rear direction, and a lens cut 240 is applied to a part of the rear surface 24 of the light guide plate 51. The lens cut 240 is provided in a partially assembled manner on the light guide plate 51, and when the set of the lens cut 240 lights the LED 3, it becomes a light emitting portion. In addition, the design shape of the light emitting portion can be expressed by the shape of this set.

  As shown in FIG. 10, the light guide plate 52 is disposed in the front part of the light guide plate 51 in the front-rear direction of the lamp 1, and a lens cut 240 is also provided on the rear surface 24 of the light guide plate 52 in the same manner as described above. It is given to the department. The point that the lens cut 240 becomes the light emitting portion is the same as described above. The lens cut 240 applied to the light guide plate 52 may be arranged at a position overlapping the lens cut 240 applied to the light guide plate 51 or a non-overlapping arrangement in a front view.

  As shown in FIG. 10, the light guide plate 53 is located at the front part of the light guide plate 52, that is, the foremost part of the lamp 1 in the front-rear direction of the lamp 1. Similar to the light guide plates 51 and 52, a lens cut 240 is applied to a part thereof. Further, the lens cut 240 applied to the light guide plate 53 may be arranged so as to overlap with the lens cut 240 applied to the light guide plates 51 and 52 in a front view or not.

  These light guide plates 51 to 53 are all substantially plate-like and planar, but may be three-dimensionally curved.

The lens cut 240 applied to the light guide plates 51, 52, 53 may be provided with an appropriate length similar to the lens cut 240 described in the above embodiment. Square, trapezoidal, rhombus, and various other concave or convex dot shapes can be employed. At this time, in any shape, each surface is formed by the R portion without forming an edge line edge in the lens cut 240, between the lens cuts 240, or in the connection portion between the lens cut 240 and the planar portion of the light guide plate. It must be connected. The plane portion indicates a plane serving as a reference of the light guide plate between the lens cuts 240 when the lens cuts 240 are arranged with a space therebetween.
In FIG. 9, for convenience of explanation, the lens cut 240 is shown as a square shape. However, the edge line of the lens cut 240 is not actually seen on the light guide plate. The size of the lens cut 240 is actually smaller than this.

  Furthermore, the lens cut 240 has a fine shape with a size and height of 0.1 mm or less. Therefore, compared with the case where the lens cut 240 is formed in a general size (for example, 1 to 3 mm), the thickness of the light guide plate can be reduced, and when the light guide plate is viewed from the front when not lit. , You can achieve a more transparent appearance.

  FIG. 11 is an enlarged vertical and horizontal cross-sectional portion of the portion covered with the dotted line A in FIG. 9B, and as can be seen from this figure, the lens cut 240 has a corner that becomes an edge line. It turns out that there is nothing.

  In addition, as shown in FIG. 10, the light guide plates 51 to 53 are arranged at an appropriate interval. As a result, the lens cuts 240 are arranged at a distance in the front-rear direction. In addition, since the light guide plate itself has a predetermined thickness, the interval between the light guide plates is not necessarily required, and may be provided by the action described later.

  In the lamp 1 described above, by turning on the LED 3 serving as the light source, the light from the LED 3 is reflected by the lens cut 240 of each of the light guide plates 51 to 53 and irradiated forward. For this reason, since the lens cut 240 is visually recognized as shining, the aggregated shape of the lens cuts 240 is recognized as the light emitting unit. This light emitting part emits light that floats in the space, and a novel design can be obtained. Since this lens cut 240 is provided in each of the overlapped light guide plates 51 to 53 and is positioned at an interval in the front-rear direction, a stereoscopic effect with depth is obtained when viewed from the front, A lamp that emits light three-dimensionally is obtained. By adjusting the distance between the light guide plates, it is also possible to adjust the strength of the depth feeling.

  In addition, when the LED 3 serving as the light source is not lit, there is no corner as an edge line as described above, and the lens cut 240 is very fine, so that a transparent plate with a sense of transparency can be obtained, and a clear lighting fixture can be obtained. it can. Moreover, it becomes possible to make the inside of the lamp 1 visible by arranging another lamp or a design structure at the rear part.

  Furthermore, the amount of light reflected from this portion can be adjusted by adjusting the density of the group of lens cuts 240 and the shape of the lens cuts 240. Thereby, since the radiation amount of light from each light guide plate can be adjusted, it is possible to change the light irradiation amount and add gradation even within one light guide plate.

  Furthermore, in the said embodiment, although demonstrated as what lighted LED3 of each light-guide plate 51-53 simultaneously, it is also possible to change a light emission form by lighting LED3 only of a specific light-guide plate. . Moreover, it is good also as the lamp 1 using only any one among the light-guide plates 51-53.

  The embodiments to which the present invention can be applied are not limited to the above-described embodiments, and can be appropriately changed without departing from the spirit of the present invention.

  For example, in the above embodiment, the lamp 1 is accommodated in the headlamp 10 of the vehicle. However, the lamp according to the present invention is a vehicle lamp other than the headlamp (for example, a rear lamp, a door mirror turn lamp, an interior lamp). Of course, the present invention can also be applied to lamps for general lighting other than for vehicles.

  Moreover, LED3, 4 is good also as what can light-emit in multiple colors, respectively. Specifically, LEDs 3 and 4 in which a plurality of light emitting elements that emit light with different emission colors (for example, red, white, amber) are packaged may be used. By using such LEDs 3 and 4 and switching the emission color as necessary, the lamp 1 can be a versatile lamp that can function as a plurality of types of lamps (for example, a turn lamp, a tail stop lamp, etc.). Can do.

  Moreover, although the light-guide plate 2 was extended along the direction inclined diagonally with respect to the lamp front-back direction, it is not limited to this, You may be along the left-right direction. In this case, the second LED 4 may cause the light L <b> 2 to enter the light guide plate 2 from the end of the light guide plate 2, similarly to the first LED 3.

DESCRIPTION OF SYMBOLS 1 Lamp 2 Light-guide plate 21 Back end part 210 Light incident part 211 1st incident surface 212 2nd incident surface 213 Reflective surface 22 Front end part 220 Condensing part 221 1st incident surface 222 2nd incident surface 223 Reflective surface 224 Output surface 23 Front surface 24 Rear surface 240 Lens cut 241 First prism surface 242 Second prism surface P Cut pitch H Cut height Ra R portion Rb R portion 3 First LED
Ax1 Optical axis 4 Second LED
Ax2 Optical axis L1 light (light from the first LED)
L2 light (light from the second LED)

Claims (5)

A light guide plate;
A light source disposed at an end of the light guide plate;
In the lamp that emits light emitted from the light source and incident on the light guide plate from the end portion, from the front surface of the light guide plate,
On the rear surface of the light guide plate, a plurality of lens cuts for reflecting the light guided in front of the light guide plate to the front surface is applied to at least a part,
The plurality of lens cuts are smoothly connected at adjacent lens cuts or at a flat portion and an R portion of a light guide plate, and the size of the cuts is finely formed.   The lamp according to claim 1, wherein each of the plurality of lens cuts has an R portion formed at each peak portion, and each surface of the lens cut is smoothly connected.   The lamp according to claim 1 or 2, wherein a height of the cut is 0.1 mm or less.   Each of the plurality of lens cuts is substantially a prism cut, and one of the prism surfaces forms an angle of 27 ° to 29 ° with the front surface of the light guide plate, and the other prism surface has a front surface of the light guide plate of 72 ° to 72 °. The lamp according to any one of claims 1 to 3, wherein the lamp has an angle of 78 °.   The lamp according to any one of claims 1 to 4, wherein a plurality of the light guide plates are arranged to overlap each other.

Images