JP2021082500A - Vehicular lighting fixture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lamp for a vehicle capable of improving the appearance of a design. SOLUTION: A vehicle lighting tool extends in a vehicle width direction with an LED element 1, a light guide rod 2 extending in the vehicle width direction and receiving light L1 from the LED element 1, and extending in a curtain shape below the light guide rod 2. An inner lens 3'that receives the light L2 propagating in the light guide rod 2 and propagates the light L3 and emits it as light L4 to the rear of the vehicle, and a light guide provided behind the light guide rod 2 and the inner lens 3'. It is composed of a rod 2 and a reflector 4 that reflects light leaking from the inner lens 3'. The inner lens 3'has a lens cut 3a for reflecting the light L3 to the rear of the vehicle as the light L4. In the inner lens 3', the total reflection surface 3c is formed by applying a triangular cut 3b in the vicinity of the LED element 1 side. The total reflection surface 3c illuminates the lens cuts 3a directly below and behind the LED element 1 of the inner lens 3'with the half-value angle internal light incident on the inner lens 3'from the LED element 1. [Selection diagram] Fig. 1

Description

The present invention relates to vehicle lamps such as tail lamps.

In recent years, light emitting diode (LED) elements that emit highly directional light have been used as vehicle lighting fixtures such as tail lamps.

7A and 7B show a conventional vehicle lamp, FIG. 7A is a front view, and FIG. 7B is a sectional view taken along line BB of the light guide rod and the inner lens of (A) (see: Patent Document 1). In FIG. 7, the top, bottom, left, right, front, and rear are directions viewed from the rear of the vehicle.

In FIG. 7, the vehicle lighting equipment includes one or two red LED elements 1, a light guide rod 2 extending in the vehicle width direction and receiving light L1 from the LED element 1, and a light guide rod 2. An inner lens (also called a light curtain) 3 that extends downward in a curtain shape, receives light L2 propagating in the light guide rod 2, propagates light L3, and emits light L4 to the rear of the vehicle, and a light guide rod. 2 and a reflector 4 provided behind the inner lens 3 and reflecting the light leaked from the light guide rod 2 and the inner lens 3. The light guide rod 2 and the inner lens 3 are integrally formed of a single light guide component made of a transparent resin such as acrylic resin.

The light guide rod 2 directs the incident end surface for receiving the light L1 from the LED element 1, the peripheral surface for emitting the light L2 to the inner lens 3, and the light L2 propagating in the light guide rod 2 toward the peripheral surface. It has a light guide cut for reflection.

The inner lens 3 has a lens cut 3a for reflecting the light L3 propagating in the inner lens 3 to the rear of the vehicle as the light L4. In this case, the light L4 has, for example, a horizontal stripe design according to the lens cut 3a.

Japanese Unexamined Patent Publication No. 2014-41787

As shown in FIG. 8 which is a diagram for explaining the first problem, the LED element 1 emits light L11, light L12, light L13, and light L14 in addition to the light L1 which is directly incident on the light guide rod 2. Generally, the LED element 1 has a highly directional Lambersian light distribution. In this directivity, if the angle that is 50% relative to the central axis 0 ° is the half-value angle, the luminous intensity is large in the half-value angle inner region (inside the directivity characteristic region) A, and the half-value angle outer region (directivity characteristic). Out of region) In B, the luminosity is small. Therefore, the brightness of the light L11, the light L12, and the light L13 in the half-value angle inner region A is large and contributes to the light L4 of the inner lens 3, while the brightness of the light L14 in the half-value angle outer region B is small and the inner lens. It hardly contributes to the light L4 of 3. As a result, there is a problem that the lens cut 3a of the inner lens 3 directly below and behind the LED element 1 does not shine and the design does not look good.

As shown in FIG. 9, which is a diagram for explaining the second problem, the half-value angle internal lights L11, L12, and L13 having high brightness may be emitted to the reflector 4 as leaked light after being once incident on the inner lens 3. .. Therefore, the half-value intra-angle internal lights L11, L12, and L13 as leakage light enter the inner lens 3 again from the reflector 4, and at that time, the lens cut 3a is not illuminated and is between the lens cut 3a and the lens cut 3a separated from the lens cut 3a. The light reflected by the reflector 4 may re-enter the back surface of the inner lens 3 and be emitted from the front surface of the inner lens 3 to the rear of the vehicle. As a result, there is a problem that the reflector 4 between the lens cut 3a and the lens cut 3a separated from the lens cut 3a appears to shine due to the half-value angle internal lights L11, L12, and L13 having high brightness, and the appearance of the design is also inferior. The lights L11, L12, and L13 in FIG. 9 actually reflect three-dimensionally.

FIG. 10 is a photograph showing the brightness distribution of the lighting state of the vehicle lamp of FIG. 7. As shown in the dark state P1 of FIG. 10, the lens cuts 3a directly below and behind the LED element 1 do not shine, and the design looks poor. Further, as shown in the bright state P2 of FIG. 10, the reflector 4 between the lens cut 3a near the LED element 1 and the lens cut 3a separated from the LED element 1 shines to brighten, and the parts other than the lens cut 3a shine, and the design also looks good. Is bad.

In order to solve the above-mentioned problems, the vehicle lighting equipment according to the present invention includes a light source, a light guide rod extending in the vehicle width direction and having an incident surface for receiving light from the light source, and a light guide rod below the light guide rod. It is a vehicle lighting tool integrally formed with a curtain-shaped inner lens having a design lens cut on the rear surface, and direct light from the light source is directly under the light source of the inner lens and in the vicinity of the light source of the inner lens. A lens cut is formed to form a total reflecting surface for reflecting backward.

Further, the vehicle lamp according to the present invention is integrally formed below the light source, a light guide rod extending in the vehicle width direction and having an incident surface for receiving light from the light source, and a rear surface thereof. It includes a curtain-shaped inner lens having a lens cut for design, a light guide rod, and a reflector provided behind the inner lens, and the reflector is provided with a concave-convex shape portion in the vicinity of a light source.

According to the present invention, the appearance of the design can be improved.

A first embodiment of a vehicle lamp according to the present invention is shown, (A) is a front view, and (B) is a sectional view taken along line BB of the light guide rod and the inner lens of (A). The vicinity of the triangular cut in FIG. 1 is shown, (A) is an enlarged view, and (B) is a further partially enlarged view. It is a figure for demonstrating the operation of the vehicle lamp of FIG. A second embodiment of the vehicle lamp according to the present invention is shown, (A) is a front view, and (B) is a sectional view taken along line BB of the light guide rod, inner lens, and reflector of (A). 4A and 4B are views for explaining the operation of the vehicle lamp of FIG. 4, in which FIG. 4A is a front view and FIG. 4B is a sectional view taken along line BB of the light guide rod, inner lens and reflector of FIG. 4A. .. It is a photograph which shows the luminance distribution of the lighting state of the vehicle lamp of FIG. A conventional vehicle lamp is shown, (A) is a front view, and (B) is a sectional view taken along line BB of the light guide rod and the inner lens of (A). It is a figure for demonstrating the 1st problem of the vehicle lighting equipment of FIG. 7 is a view for explaining the second problem of the vehicle lighting fixture of FIG. 7, in which FIG. 7A is a front view and FIG. 7B is a cross-sectional view of a light guide rod, an inner lens, and a reflector of FIG. 7A. It is a photograph which shows the brightness distribution of the lighting state of the vehicle lighting equipment of FIG.

FIG. 1 shows a first embodiment of a vehicle lamp according to the present invention, (A) is a front view, and (B) is a sectional view taken along line BB of the light guide rod and the inner lens of (A). .. In FIG. 1, the top, bottom, left, right, front, and rear are directions viewed from the rear of the vehicle.

In FIG. 1, an inner lens 3'is provided instead of the inner lens 3 of FIG. In the inner lens 3', the total reflection surface 3c is formed by applying a triangular cut 3b in the vicinity of the LED element 1 side. The total internal reflection surface 3c illuminates the lens cuts 3a directly below and behind the LED element 1 of the inner lens 3'with the half-value angle internal lights L11, L12, and L13 (see FIG. 3) incident on the inner lens 3'from the LED element 1. It is for.

FIG. 2 is an enlarged view of the vicinity of the total reflection surface 3c of FIG.

As shown in FIG. 2, the total reflection surface 3c faces slightly downward while facing the LED element 1. As a result, the half-value angle internal lights L11, L12, and L13 (see FIG. 3) from the LED element 1 are reflected below the inner lens 3'. Further, the light guide cut 1a is not provided on the triangular cut 3b side of the light guide rod 2, so that when the triangular cut 3b is reflected by the half-value angle internal light, a large amount of light is incident on the light guide rod 2. be able to. A semi-cylindrical knurl 3d is formed on the total reflection surface 3c along the thickness direction of the light guide plate. The knurl 3d has a semi-cylindrical shape that is convex toward the inner surface of the triangular cut 3b, but may have a concave semi-cylindrical shape in the opposite direction.

The triangular cut 3b is formed with a light guide surface 3e that coincides with the bottom surface of the light guide rod 2. This internally reflects the light L1 from the LED element 1 on the light guide surface 3e and guides the light L1 to the region 2a where the light guide cut of the light guide rod 2 is formed. Further, since the light guide cut 1a is not formed on the top surface of the light guide rod above the light guide surface 3e, the region 2b without the light guide cut is internally reflected even on the top surface of the light guide rod 2. It is devised so that the light guide rod 2 is guided to the region 2a where the light guide cut is formed. As a result, the light L1 from the LED element 1 transmitted to the light guide rod 2 is minimized from being attenuated.

FIG. 3 is a diagram for explaining the operation of the vehicle lamp of FIG. 1.

As shown in FIG. 3, the half-value angular internal lights L11, L12, and L13 having a large amount of light incident on the inner lens 3'without being incident on the light guide rod 2 reflect the total reflection surface 3c of the inner lens 3'. It faces directly below and behind the LED element 1 of the inner lens 3'. In this case, although the amount of light is small, the half-value angle external light L14 also faces directly below and behind the LED element 1 of the inner lens 3'. As a result, the lens cuts 3a directly below and behind the LED element 1 of the inner lens 3'are illuminated, and the appearance of the design is improved. Further, from the knurled 3d, the half-value angle internal lights L11, L12, and L13 hit the entire horizontally long line of the lens cut 3a directly below and behind because the light reflected by the total reflection surface 3c is diffused and directed directly below and behind. The lens cut 3a can produce uniform line emission.

FIG. 4 shows a second embodiment of the vehicle lamp according to the present invention, (A) is a front view, (B) is a cross-sectional view taken along the line BB of the light guide rod, inner lens and reflector of (A). Is. In FIG. 4, the top, bottom, left, right, front, and rear are directions viewed from the rear of the vehicle.

In FIG. 4, a reflector 4'is provided behind the light guide rod 2 and the inner lens 3'. The reflector 4'is composed of a concave-convex shape portion 41 on the light guide rod 2 side and a flat shape portion 42 on the non-light guide rod side. Further, each convex portion on the inner lens 3'side of the concave-convex shape portion 41 is formed by the apex portion 4a on the inner lens 3'side, the upper flat portion 4b of the apex portion 4a, and the lower flat portion 4c of the apex portion 4a. It is composed. In this case, each apex portion 4a on the inner lens 3'side of the concave-convex shape portion 41 corresponds to each lens cut 3a of the inner lens 3'. Therefore, the apex portion 4a serves to reflect the light incident on the apex portion 4a to the lens cut 3a. On the other hand, the light incident on the upper flat portion 4b adjacent to the apex portion 4a of the concave-convex shape portion 41 is reflected upward by the upper flat portion 4b.

5A and 5B are views for explaining the operation of the vehicle lamp of FIG. 4, in which FIG. 5A is a front view and FIG. 5B is a cross section of the light guide rod, inner lens and reflector of FIG. 4A in line BB. It is a figure.

As shown in FIG. 5, the half-value angle internal lights L11, L12, and L13 are reflected by the upper flat portion 4b of the concave-convex shape portion 41 and are directed upward. As a result, the light seen from the rear of the vehicle of the reflector 4'between the lens cut 3a and the lens cut 3a separated from the lens cut 3a is reduced. On the other hand, the half-angle external light L14 is reflected by the apex portion 4a of the concave-convex shape portion 41 and is transmitted through the inner lens 3'through the lens cut 3a of the inner lens 3'. As a result, the appearance, that is, the design is improved. The lights L11, L12, L13, and L14 in FIG. 5 actually perform three-dimensional reflection.

FIG. 6 is a photograph showing the brightness distribution of the lighting state of the vehicle lighting fixture of FIG. As shown in P1'of FIG. 6, the lens cuts 3a directly below and behind the LED element 1 also shine, and the appearance of the design is improved. Further, as shown in P2'of FIG. 6, the brightness of the reflector 4'near the LED element 1 is reduced, the light of the lens cut 3a becomes remarkable, and the appearance of the design is also improved.

In the above-described embodiment, the triangular cut 3b of the inner lens 3'is for forming the total reflection surface 3c, and the shape is not limited to the triangular shape, and the hole-shaped cut, the convex-shaped cut, and the concave-shaped cut are not limited. Other shapes such as, etc. may be used. This embodiment is formed in a concave cut shape. As a result, light that is totally reflected by the total reflection surface 3c and light that guides the lower part of the triangular cut 3b are created, and the amount of light that leaks toward the inner lens 3 directly under and behind the LED element 1 is controlled to directly underneath. And the brightness of the rear inner lens 3 can be adjusted.

Further, in the above-described embodiment, the LED element is used as the light emitting element, but in the present invention, another light emitting element such as a laser diode (LD) element having high directivity may be used.

Moreover, the present invention may be applied to any modification within the obvious scope of the embodiments described above.

In addition to tail lamps, the present invention can also be used for vehicle lighting fixtures such as turning lamps, stop lamps, fog lamps, daytime running lamps (DRL), position lamps, and high-mount stop lamps that require a design.

1: LED element 2: Light guide rod 2a: Area with light guide cut 2b: Area without light guide cut 3, 3': Inner lens (light guide body)
3a: Lens cut 3b: Triangular cut 3c: Total reflection surface 3d: Knurl 3e: Light guide surface 4, 4': Reflector 41: Concavo-convex shape portion 42: Flat shape portion A: Half-value angle region (inside the directional characteristic region)
B: Out-of-half-angle region (outside the directivity region)

Claims (7)

Light source and
A light guide rod extending in the vehicle width direction and having an incident surface for receiving light from the light source,
A vehicle lamp provided with a curtain-shaped inner lens integrally formed below the light guide rod and having a design lens cut on the rear surface.
A vehicle lighting fixture in which a lens cut is formed in the vicinity of the light source of the inner lens to form a total reflection surface for reflecting direct light from the light source directly below and behind the light source of the inner lens. The vehicle lamp according to claim 1, wherein the total reflection surface is provided in the directivity region of the light source. Further, it is provided with a reflector provided behind the light guide rod and the inner lens.
The vehicle lamp according to claim 1, wherein the reflector is provided with a concave-convex shape portion in the vicinity of the light source. The convex portion on the inner lens side of the concave-convex shape portion is
The vehicle lamp according to claim 1, further comprising an apex portion facing the design lens cut of the inner lens, an upper flat portion of the apex portion, and a lower flat portion of the apex portion. Light source and
A light guide rod extending in the vehicle width direction and having an incident surface for receiving light from the light source,
A curtain-shaped inner lens integrally formed below the light guide rod and having a design lens cut on the rear surface.
It is provided with a light guide rod and a reflector provided behind the inner lens.
The reflector is a vehicle lamp having an uneven shape portion in the vicinity of the light source. The convex portion on the inner lens side of the concave-convex shape portion is
The vehicle lamp according to claim 5, further comprising an apex portion facing the design lens cut of the inner lens, an upper flat portion of the apex portion, and a lower flat portion of the apex portion. The vehicle lamp according to claim 1 or 5, wherein the light source includes a light emitting diode element or a laser diode element.

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