JP5882747B2 - Lamp - Google Patents

Description

  The present invention relates to a lamp, and particularly to a lamp provided with a long light guide lens.

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

JP 2009-199913 A

  However, in the conventional lamp described above, the lens cut formed on the rear surface of the light guide lens is a simple mountain cut, so that when the light guide lens is viewed from the front (front) when not lit, the rear lens The edge lines of the cut peaks 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 long light guide lens and has a good appearance when not lit.

In order to solve the above-mentioned problem, the invention described in claim 1
A long rod-shaped light guide lens;
A light source disposed at a longitudinal end of the light guide lens;
A lamp that emits light emitted from the light source and incident on the light guide lens from the end portion from the front surface of the light guide lens along the longitudinal direction.
The light guide lens is formed in a shape in which the thickness from the rear surface to the front surface gradually decreases as the distance from the end portion increases along the longitudinal direction,
On the rear surface of the light guide lens, a plurality of lens cuts reflecting the light guided in the light guide lens along the longitudinal direction to the front surface are arranged in parallel along the longitudinal direction,
The plurality of lens cuts are:
Each has a first prism surface opposite to the end in the longitudinal direction and a second prism surface on the end side, and the area of the first prism surface is the area of the second prism surface Formed to be larger than
Two adjacent lens cuts are connected by a trough that smoothly connects the first prism surface on the end portion side and the second prism surface on the opposite side to the end portion,
Each lens cut has a height of 0.1 mm or less .

The invention according to claim 2 is the lamp according to claim 1,
The first prism surface is formed in a planar shape in which an angle formed by a straight line connecting two adjacent valley portions on both sides of the first prism surface is within a range of 27 ° to 29 °. And

The invention according to claim 3 is the lamp according to claim 1 or 2,
The plurality of lens cuts are characterized in that a cut pitch along the longitudinal direction is 0.1 mm or less.

The invention according to claim 4 is the lamp according to any one of claims 1 to 3,
The second prism surface is formed in a planar shape in which an angle formed by a straight line connecting two adjacent valley portions on both sides of the second prism surface is within a range of 72 ° to 78 °. And
Invention of Claim 5 is a lamp | ramp as described in any one of Claims 1-4,
The end portion of the light guide lens includes a second light source disposed in the vicinity of the other end portion on the opposite side in the longitudinal direction and at a position behind the other end portion.

According to the first aspect of the present invention, the plurality of lens cuts formed on the rear surface of the long light guide lens are smoothly connected at the valley portion between two adjacent lens cuts. However, unlike the conventional case where the light guide lens 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. Therefore, the appearance when the light guide lens is viewed from the front when not lit can be made transparent and good.

Moreover, since the height of each lens cut is formed to be 0.1 mm or less , the thickness of the light guide lens can be reduced. Therefore, the appearance when the light guide lens 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.

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 lens 2 and two LEDs 3 and 4. And.

  The light guide lens 2 is arranged in a state extending substantially along a direction obliquely inclined 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. ing. More specifically, in the present embodiment, the light guide lens 2 has a right angle from the rear end 21 on the rear side in the longitudinal direction toward the front end 22 on the front side in the longitudinal direction at an inclination angle of about 50 ° with respect to the left-right direction. It extends slightly along the direction inclined toward the vehicle interior, and is slightly curved backward from the front end 22 toward the rear end 21.

  As shown in FIG. 3, in the vicinity of the rear end portion 21 of the light guide lens 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 lens 2 is formed with a light incident portion 210 that allows the light emitted from the first LED 3 to enter the light guide lens 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 causes the light emitted from the first LED 3 to enter the light guide lens 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 lens 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 lens 2 is internally reflected (totally reflected) so as to substantially follow the optical axis Ax1.
The rear end portion 21 of the light guide lens 2 is supported by the extension 12 in a state where the first incident surface 211 and the second incident surface 212 are 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 lens 2, the second LED 4 out of the two LEDs 3 and 4 is located on a linear extension line connecting the front end portion 22 and the rear end portion 21. It is located slightly behind. 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 lens 2, a condensing unit 220 that condenses the light emitted from the second LED 4 within a predetermined angle range from the front end portion 22 to the rear so as to face the second LED 4. Projected. 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 lens 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 Ax2 is irradiated on the rear surface 24 of the light guide lens 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 lens 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 that extends over substantially the entire length of the light guide lens 2, and as will be described later, the 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 lens 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.
In addition, a plurality of lens cuts 240 arranged in parallel along the longitudinal direction of the light guide lens 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 sawtooth shapes arranged in parallel along the longitudinal direction of the light guide lens 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 lens 2 and the light guide lens 2. And a second prism surface 242 on the rear side (left side) in the longitudinal direction.

Of these, the first prism surface 241 has an angle θ1 formed between 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 lens 2) within a range of 27 ° to 29 °. It is a plane. 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 lens 2.
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 lens 2) is in the range of 72 ° to 78 °. It is. 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 lens 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 the front surface 23 of the light guide lens 2, and occupies each lens cut 240. Since the area of the surface 241 is larger, the lens cuts 240,... Can be made inconspicuous when the light guide lens 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 lens 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.

  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 lens 2 can be reduced, and the light guide lens is not illuminated. When 2 is viewed from the front, a more transparent appearance can be realized.

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. 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 lens 2. The light L1 incident on the light guide lens 2 is directly or internally reflected on the front surface 23 and indirectly guided from the rear end portion 21 toward the front end portion 22 in the light guide lens 2. Go.

The light L1 guided through the light guide lens 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 lens 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, the light guide lens 2 is guided from the rear end portion 21 into the light guide lens 2. The light L1 that is emitted is guided relatively easily to the back side (front end 22 side) of the curved light guide lens 2 while being internally reflected by the front surface 23.
Further, the light L1 guided in the light guide lens 2 has a shorter optical path length (light guide length) to the front surface 23 than light guided in the light guide lens having a constant thickness. The attenuation of the light L1 accompanying the light guide in the light guide lens 2 is reduced.

  On the other hand, the light L2 emitted from the second LED 4 irradiates the rear surface 24 of the light guide lens 2 over substantially the entire length while being condensed near the optical axis Ax2 through the condenser 220 as shown in FIG. Is done.

The light L2 is internally reflected forward by the lens cuts 240,... Formed on the rear surface 24 while entering the light guide lens 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 lens 2. Then, 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 light 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 lens 2 are emitted forward from the front surface 23 of the light guide lens 2, respectively. Emits more strongly 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 lens 2 are smoothly connected to the adjacent ones at the R portion Ra. Unlike the conventional case where the cut is formed in a simple mountain shape, when the light guide lens 2 is viewed from the front when not lit, the edge lines of the valleys of the plurality of lens cuts 240,. Accordingly, the appearance when the light guide lens 2 is viewed from the front when not lit can be made transparent and good.
Further, by realizing such a transparent appearance, it is easy to visually recognize the configuration (for example, the color and shape of a member different from the light guide lens 2) provided behind the light guide lens 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,. it can. Therefore, the appearance when the light guide lens 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 lens 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 lens 2 is viewed from the front when not lit, the edge lines of the mountain portions of the plurality of lens cuts 240,. Absent. Therefore, the appearance when the light guide lens 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 lens 2 is incident on the light guide lens 2 from the rear end portion 21, the lens cuts 240, ... formed on the rear surface 24 are used. While being internally reflected forward and emitted forward from the front surface 23, the light L <b> 2 from the second LED 4 disposed in the vicinity of the front end portion 22 of the light guide lens 2 is emitted toward the rear surface 24 of the light guide lens 2. Are incident on the light guide lens 2 while being refracted by the lens cuts 240,... Formed on the rear surface 24, and then internally reflected forward and emitted forward from the front surface 23. That is, the light guide lens 2 is different from the case where light is simply incident on the long light guide lens extending along the direction inclined with respect to the front-rear direction from both end faces in the longitudinal direction of the light guide lens. In addition to the light from the first LED 3 disposed in the vicinity of the rear end portion 21, the light L 2 from the rearward second LED 4 disposed in the vicinity of the front end portion 22 of the light guide lens 2 is also guided. The light can be emitted forward from the front surface 23 of the lens 2.
Therefore, the light from the two LEDs 3 and 4 in which the front surface 23 of the long light guide lens 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 lens 2. L1 and L2 can emit light forward.

  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 entering the light guide lens 2 from the rear end portion 21 to the first prism. The front end portion of the surface 241 enters the light guide lens 2 while refracting the light emitted from the second LED 4, and the second prism surface 242 extends from the front end side portion of the first prism surface 241 to the light guide lens 2. Since the light incident on the inside is internally reflected forward, that is, 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 mutually connected. It plays an independent function. Therefore, the plurality of parts can be optimally designed individually.

  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.

  The two LEDs 3 and 4 may each be capable of emitting light in a plurality of colors. Specifically, as the two LEDs 3 and 4, a package in which a plurality of light emitting elements that emit light having different light emission colors (for example, red, white, and amber) 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 lens 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, similarly to the first LED 3, the second LED 4 may cause the light L <b> 2 to enter the light guide lens 2 from the end of the light guide lens 2.

DESCRIPTION OF SYMBOLS 1 Lamp 2 Light guide lens 21 Rear end part 210 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 long rod-shaped light guide lens;
A light source disposed at a longitudinal end of the light guide lens;
A lamp that emits light emitted from the light source and incident on the light guide lens from the end portion from the front surface of the light guide lens along the longitudinal direction.
The light guide lens is formed in a shape in which the thickness from the rear surface to the front surface gradually decreases as the distance from the end portion increases along the longitudinal direction,
On the rear surface of the light guide lens, a plurality of lens cuts reflecting the light guided in the light guide lens along the longitudinal direction to the front surface are arranged in parallel along the longitudinal direction,
The plurality of lens cuts are:
Each has a first prism surface opposite to the end in the longitudinal direction and a second prism surface on the end side, and the area of the first prism surface is the area of the second prism surface Formed to be larger than
Two adjacent lens cuts are connected by a trough that smoothly connects the first prism surface on the end portion side and the second prism surface on the opposite side to the end portion,
A lamp characterized in that each lens cut has a height of 0.1 mm or less . The first prism surface is formed in a planar shape in which an angle formed by a straight line connecting two adjacent valley portions on both sides of the first prism surface is within a range of 27 ° to 29 °. The lamp according to claim 1. The lamp according to claim 1 or 2, wherein the plurality of lens cuts have a cut pitch of 0.1 mm or less along the longitudinal direction . The second prism surface is formed in a planar shape in which an angle formed by a straight line connecting two adjacent valley portions on both sides of the second prism surface is within a range of 72 ° to 78 °. The lamp according to any one of claims 1 to 3. The end portion of the light guide lens includes a second light source disposed in the vicinity of the other end portion on the opposite side in the longitudinal direction and at a position behind the other end portion. The lamp as described in any one of 1-4.

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