JP2947974B2 - Vehicle lighting - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a horizontally long vehicle lamp having a smaller width than its width, and more particularly to an inner lens having a Fresnel step formed inside an outer lens having a diffusion step. Vehicle lighting device.

[0002]

2. Description of the Related Art As shown in FIGS. 9 to 11, a conventional lamp of this type includes a bulb 5 as a light source in a horizontally long lamp space formed by a lamp body 2 and an outer lens 3. As shown in FIG.
Is accommodated, an inner lens 6 having a Fresnel step for forming parallel light is disposed in front of the bulb 5, a diffusion step 4 is formed in the outer lens 3, and light emission of the bulb 5 is performed by the inner lens 6. , And becomes substantially parallel light, is diffused by the diffusion step 4 and is emitted and distributed from the outer lens 3. That is, in the inner lens 6, a Fresnel step 7 a is formed in a region where the incident angle θ of the direct light is small, that is, in the region A directly facing the bulb 5, and a region where the incident angle θ of the direct light is large, that is, right and left from the bulb 5. A prism step 7b is formed in the separated area, so that all light emitted from the inner lens 6 becomes substantially parallel light and is guided to the outer lens 3.

[0003]

However, in the above-described conventional lamp, when the lamp is lit, as shown in FIG. There is a first problem that this occurs, and a second problem that the upper and lower side edges of the outer lens 3 appear to shine intensively, as shown in FIG.

As a result of examinations made by the inventor, the first problem is that the Fresnel step 7a and the prism step 7a
It was confirmed that this was due to the difference in the amount of light emitted from b.
That is, as shown in FIG.
In this example, substantially the entire surface of the step element is an effective incident surface for incident light, but in the prism step 7b, only approximately half of the step element is an effective incident surface for incident light. For this reason, the ratio of the amount of light La emitted from the Fresnel step 7a to the amount of light Lb emitted from the prism step is 10: 6, and the center of the outer lens 3 in the left-right direction (the region facing the bulb) is compared with the left and right regions. Since the light amount becomes extremely large, a snake phenomenon occurs, and the appearance is poor.

As shown in FIG. 11, the outer lens 3 has a side wall 3b for forming a seal leg 3a for engaging with the seal groove 2a on the lamp body side. In a region along the side wall 3b, there is a band-shaped non-step region 4a in which the diffusion step 4 is not formed. The inner lens 6 is fixed to the lamp body 2, and a minute gap 6 a is formed between the inner lens 6 and the lamp body 2.
Light from the bulb 5 leaks from a as shown by the arrow in FIG. 11, and this light leaks out from the non-step region 4a having no diffusion action. Since the non-step region 4a has no light diffusion effect, this region appears to be illuminated intensively.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and has as its object to provide an appearance which is free from the problem that the area along the upper and lower side edges of the outer lens shines, and in which the snake phenomenon does not appear. An object of the present invention is to provide a good vehicle lamp.

[0007]

According to a first aspect of the present invention , there is provided a vehicle lighting device comprising: a lamp body;
Compared to the vertical width formed by the outer lens
The light source is housed in a long horizontal lamp room space,
-An inner lens is placed between the lens and the light source,
In the outer lens, the incident light is
Diffusion step is formed,
In the area directly facing the light source, the direct light from the light source is
The Fresnel step to make the output light almost parallel
Direct light from the light source on the optical axis
Prism steps to make outgoing light approximately parallel to
In the formed vehicle lamp, the inner lens cover is provided.
Cut the upper and lower side edges of the area facing the lube
Chip, the vertical width of the Fresnel step formation area
The height is made smaller than the vertical width of the
On the upper and lower side walls of the
Blocks the light going to the notch and over the front of the outer lens
The light going to the non-diffusion step formation area along the lower sidewall
The light-shielding portion for shielding is formed to extend.
You.

[0008]

[0009]

[0010]

In the first aspect, the upper and lower side edges are cut out in the area directly facing the bulb of the inner lens, and
The light-blocking ribs block the light going to this notched area
The upper and lower sides of the area facing the bulb of the outer lens
Light emission amount at the edges becomes Rukoto be reduced, the outer lens
Between the central part and the left and right areas directly opposite the bulb
The difference in the amounts is smoothed. It also extends to the lamp body
Shaded parts from the light source to the upper and lower side walls on the front of the outer lens
Along the diffusion step-free area along the
Do not make the upper and lower side edges of the
No.

[0011]

[0012]

[0013]

Next, an embodiment of the present invention will be described with reference to the drawings. FIGS. 1 to 4 are diagrams for explaining an embodiment of the present invention .
Shows a reference example, FIG. 1 is a front view of a tail and stop lamp according to the first reference example, FIG. 2 is a horizontal sectional view of the lamp (sectional view taken along line II-II shown in FIG. 1) , FIG.
Is a vertical cross-sectional view of the lamp (a cross-sectional view along line III-III shown in FIG. 1), and FIG. 4 is a perspective view of the inner lens as viewed from the back.

In these figures, reference numeral 10 denotes a horizontally long container-like lamp body having a lateral width (width in the left-right direction) longer than a vertical width (vertical width). An outer lens 12 is provided on the front opening of the lamp body 10. Is assembled to form a lamp room space inside. A bulb 14 as a light source inserted into the bulb insertion hole 11 of the lamp body is disposed substantially at the center of the lamp room space in the left-right direction. A fish-eye step 13 for diffusing light is formed on the outer lens 12, and between the bulb 14 and the outer lens 12,
A horizontally long inner lens 16 having a Fresnel step 17 and a prism step 18 is arranged. The Fresnel steps 17 are formed substantially at the center of the inner lens 16 in the left-right direction, and the prism steps 18 are formed on both sides of the inner lens 16 in the left-right direction. That is, Fresnel steps 17 are formed on the back side of the area 16A of the inner lens 16 directly facing the bulb 14 (the area where the incident angle of the direct light from the bulb is small), and the left and right areas (the area from the bulb) of this Fresnel step formation area. A prism step 18 is provided for the areas 16B and 16B where the incident angle of the direct light is large.
Is formed, and the direct light from the bulb 14 passes through the inner lens 16 to become substantially parallel light and is guided to the outer lens 12.

Further, prism step forming regions 16b ₁ and 16 in which prism steps 18 are formed in a strip shape are formed on the upper and lower side edges of the valve facing region 16A of the inner lens 15.
b ₂ is provided. That is, prism steps 18 having a smaller amount of emitted light than the Fresnel steps 17 are formed above and below the Fresnel step formation region 16a. Therefore, the amount of light emitted from the upper and lower side edge regions of the valve facing region 16A is smaller than in the case where the Fresnel steps are formed on the entire surface of the valve facing region. In the valve facing region 16A, the prism step forming regions 16b ₁ , 1
6b ₂ is correspondingly only the emission light intensity is small provided, prisms step formation region 16B of the emitted light quantity and the valve confronting regions left and right from the valve confronting region 16A, the astigmatic difference of the amount of light emitted from 16B is smaller. The distribution of the amount of light emitted from the inner lens in the left-right direction is smoothed. In particular, only the valve facing area 16A does not have an extreme light amount, so that the brightness of the outer lens 12 is made uniform in the left-right direction. The structure has no phenomenon.

Light-shielding ribs 20, 20 projecting inward in the vertical direction extend along the seal grooves 11 on the upper side wall 11a and the lower side wall 11b of the lamp body 10. Then, the upper and lower side edges of the inner lens 16 and the protruding end 21 of the light-shielding rib overlap in the front-rear direction, so that the light L ₁ traveling toward the fish-eye step non-formation region 13 a along the upper and lower side walls of the outer lens 12 is reliably emitted. It can be interrupted. Therefore, a gap is formed between the inner lens 16 and the lamp body 10.
However, since light does not leak from this gap, direct light does not fly to the non-fish-eye step forming area 13a, and the upper and lower side edges of the front surface of the outer lens shine like conventional lamps. There is no.

[0017] FIG. 5 is a longitudinal sectional view of the tail & stop lamp is a main part of the second reference example of the present invention. In this figure, a Fresnel step 17 is formed on the entire rear surface (on the side facing the bulb) of a region 16A of the inner lens 16 facing the bulb 14, while the bulb facing region 1 is formed.
On the front side of 6A, a prism step 1 similar to the prism steps formed in the left and right regions (regions where the incident angle of the direct light from the bulb is large) of the bulb facing region 16A.
8 is formed in a belt shape along the upper and lower side edges of the inner lens 16. In the strip-shaped area 19 where the Fresnel step 17 and the prism step 18 are formed by superimposition, the light incident on the inner lens 16 is made substantially parallel to the optical axis L ₀ by the Fresnel step 17 and then exits from the prism step 18. It is refracted in the vertical direction the optical axis L ₀ side when guided in the vertical direction central portion side of the outer lens 12. For this reason, the amount of light in the upper and lower side edge regions of the region of the outer lens 12 facing the bulb is reduced, the brightness of the outer lens is made uniform in the left-right direction, and the snake phenomenon does not occur. Others are the first
Is the same as that of the embodiment, and by attaching the same reference numerals,
The description is omitted.

6 to 8 show an embodiment of the present invention. FIG. 6 is a longitudinal sectional view of a tail and stop lamp according to an embodiment of the present invention, and FIG. 7 is a main part of the embodiment. FIG. 8 is a front view of a certain inner lens, and FIG. 8 is a perspective view showing an arrangement of a cutout portion and a light shielding rib of the inner lens. In these figures, the upper and lower side edges of a region 16A facing the bulb 14 of the inner lens 16 in which the Fresnel step is formed are cut off in the lateral direction in a band shape. Reference numeral 30 indicates a notch. The light-shielding rib 20 protruding from the lamp body 10 is formed with a protruding portion 22 corresponding to the band-shaped notch 30 on the inner lens side, so that light directed toward the notch 30 is blocked.

For this reason, the bulb 14 of the inner lens 16
The effective area in the region 16A directly facing the inner lens is smaller by the cutout, and the light amount in the upper and lower side edge regions of the valve facing region 16A of the inner lens is reduced.
The difference between the amount of light emitted from the bulb facing region 16A of the inner lens where the Fresnel steps are formed and the left and right prism step forming regions 16B is small. For this reason, the brightness of the outer lens is made uniform in the horizontal direction,
The structure has no snake phenomenon. Other structures
Is the same as that of the first embodiment described above,
The description will be omitted by attaching .

[0020]

As is apparent from the above description, according to the vehicular lamp according to the present invention, the amount of light emission at the upper and lower side edges of the region facing the bulb of the outer lens is reduced, and The difference in the amount of light emission between the central area facing the bulb and the left and right areas is reduced, the outer lens has substantially uniform brightness in the left and right direction, and no snake phenomenon occurs, improving the appearance at the time of lighting. . Further, since the light that goes to the diffusion step-free area of the outer lens is blocked by the light-shielding rib, there is no problem that the upper and lower side edges of the outer lens shine.

[Brief description of the drawings]

Front view of the tail and stop lamp, which is a first reference example of FIG. 1 the present invention

FIG. 2 is a horizontal sectional view of the lamp (a sectional view taken along line II-II shown in FIG. 1).

FIG. 3 is a longitudinal sectional view of the lamp (a sectional view along line III-III shown in FIG. 1).

FIG. 4 is a perspective view of the inner lens viewed from the back side.

FIG. 5 is a longitudinal sectional view of an inner lens housed in a tail and stop lamp according to a second reference example of the present invention.

FIG. 6 is a longitudinal sectional view of a tail and stop lamp according to an embodiment of the present invention.

FIG. 7 is a front view of an inner lens used in the lamp.

FIG. 8 is a perspective view showing an arrangement of a notch formed in an inner lens and a light shielding rib on a lamp body side.

FIG. 9 is a front view of a conventional lamp.

FIG. 10 is a horizontal sectional view of the lamp.

FIG. 11 is a longitudinal sectional view of the lamp.

FIG. 12 is an explanatory diagram showing the refraction of light in the Fresnel step and the prism step.

[Explanation of symbols]

10 Lamp Body 11a, 11b Upper and Lower Side Walls of Lamp Body 12 Outer Lens 13 Fisheye Step as Diffusion Step 13a Non-Diffusion Step Forming Area Along Upper and Lower Side Wall of Outer Lens 14 Bulb as Light Source 16 Inner Lens 16A of Inner Lens Area facing the valve 16a Fresnel step forming area 16B Side area of the valve facing area of the inner lens (side prism step forming area) 17 Fresnel step 18 Prism step 19 Overlay forming area of Fresnel step and prism step 20 Light shielding Part 30 Top and bottom notch of inner lens

Claims (1)

(57) [Claims] (1) a lamp body and an outer lens;
In a horizontally long light room space that is longer than the vertical width
The light source is accommodated in the
The inner lens is placed, and the outer lens
A diffusion step is formed to make the outgoing light diffused downward and to the left and right.
And the area facing the light source of the inner lens
Fresnel that converts direct light from a light source into outgoing light that is approximately parallel to the optical axis
Is located on the side of the Fresnel step formation area.
Is a light source that converts the direct light from the light source into light that is almost parallel to the optical axis.
Vehicle lamps, each with its own
Above and below the region facing the light source of the inner lens.
The side edges are cut out in a horizontal band, and the Fresnel step
The vertical width of the formation area is greater than the vertical width of the prism step formation area
Along with the upper and lower side walls of the lamp body
Block light traveling toward the band-shaped notch of the inner lens.
And diffusion along the upper and lower sidewalls of the front of the outer lens
A light-blocking part for blocking light going to the step
A vehicular lamp characterized by being formed.