JPH09167505A - Lighting fixture for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a hot zone to be simply formed in a lighting fixture having its performance of 300cd or more in light intensity. SOLUTION: 30 groups of reflection face elements for scattering the light from a light source bulb 4 is constituted on a reflection face, and a center part 300 of one reflection element 30 is provided with a part whose curvature radius is larger than that of the other part 301 or 302. As a result, in the parts 301 and 302 of which the curvature radius of the 30 groups of the reflection face elements is small the light from the light source bulb 4 is scattered and reflected, and this scattering reflection light is irradiated to the outside by a specified light distribution pattern through a lens 2. In the center part 300 whose curvature radius is large the light from the light source bulb 4 is reflected in an almost parallel state, this reflection light in an almost parallel state is irradiated to the outside as a hot zone HZ in the light distribution pattern through the lens 2. Thus, the hot zone can be simply formed in a lighting fixture having its performance of 300cd or more in light intensity solely by providing a part whose curvature radius is large.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicular lamp such as a back lamp of a rear combination lamp, and more particularly to a vehicular lamp which has a luminous intensity of 300 cd or more and is optimal for forming a hot zone. It concerns lighting fixtures.

[0002]

2. Description of the Related Art A vehicular lamp of this type will be described with reference to FIGS. In this example, the vehicle lamp is a back lamp of the rear combination lamps. In the figure, A is a back lamp of a rear combination lamp as a vehicle lamp. In this back lamp A, a lamp chamber 12 is defined by a lamp housing 1 and a lens (outer lens) 2,
A reflector 3 having a reflecting surface 30 and a light source bulb 4 are arranged in the lamp chamber 12. The light from the light source bulb 4 is reflected by the reflecting surface 30, passes through the lens 2, and is emitted to the outside in a predetermined light distribution pattern (see FIG. 8).

As shown in FIG. 7, the reflecting surface 30 is formed of a part of a convex cylindrical surface having a vertical axis with respect to a reference surface 31 of a paraboloid of revolution, and diffuses the light from the light source bulb 4 in the horizontal direction. A reflective surface element (so-called vertical prismatic diffusion prism)
It is composed of a group and a plurality of reflective surface elements. A circular through hole 32 for inserting the light source bulb 4 is provided at the center of the reflector 3 which constitutes the reflecting surface 30.

The inner surface of the lens 2 is composed of a part of a convex cylindrical surface of the horizontal axis, and a group of surface elements (so-called horizontal prismatic diffusion prism) 20 for diffusing light from the reflective surface 30 in the vertical direction is formed. ing.

A circular through hole 10 for inserting the light source bulb 4 is provided in the center of the lamp housing 1. On the other hand, the light source bulb 4 is detachably held by the bulb holder 40. The light source bulb 4 is inserted into the lamp chamber 12 through the through holes 10 and 32 of the lamp housing 1 and the reflector 3, and the bulb holder 40 is detachably held in the through hole 10 of the lamp housing 1. Is a predetermined position in the lamp chamber 12 (a filament (not shown) of the light source bulb 4 is a reference surface 31 of the parabolic surface of the reflecting surface 30
Is located near the focal point (not shown). In FIG. 6, reference numeral 11 is a shade (heat shield).

When the light source bulb 4 is turned on, the light from the light source bulb 4 is diffused and reflected in the horizontal direction of the reflecting surface 30, and the reflected light diffused in the horizontal direction is caused by the surface element group 20 on the inner surface of the lens 2. The light is diffused in the vertical direction, passes through this lens 2, and is radiated to the outside in a predetermined light distribution pattern as shown in FIG.

[0007]

Among the above-described vehicle lamps, there is a demand for a lamp having a luminous intensity of 300 cd or more. For example, in the back lamp A of the above-mentioned rear combination lamps, it is necessary to irradiate the irradiation light far backward due to the spoiler mounted on the high deck or the rear due to the increase in the rear trunk capacity. Accordingly, it is necessary to raise the luminous intensity of the irradiation light to, for example, 300 cd or more.

On the other hand, according to the JIS standard for automotive lamps, it is stipulated that a hot zone (a bright point, which is a so-called main optical axis) is formed in a lamp having a luminous intensity of 300 cd or more. ing.

However, in the above vehicle lamp,
As shown in the light distribution pattern of FIG. 8, there is a problem that the hot zone HZ cannot be specified because the width of the hot zone HZ is wide.

It is an object of the present invention to provide a vehicular lamp which is optimum for forming a hot zone in a lamp having a luminous intensity of 300 cd or more.

[0011]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present invention provides a reflection surface with a portion of a convex cylindrical surface with respect to a reference surface of a paraboloid of revolution to allow light from a light source bulb to pass through. A reflecting surface element group for diffusing is configured, and at least one reflecting surface element of the reflecting surface element group has a radius of curvature larger than that of the other portion.

As a result, according to the present invention, the light from the light source bulb is diffused and reflected in the other part of the reflective surface element group except for the part having a large radius of curvature, and this diffusely reflected light passes through the lens and is distributed in a predetermined manner. The light pattern is emitted to the outside. on the other hand,
When the light from the light source bulb is diffused and reflected in the part where the radius of curvature is large, the range of diffusion of the reflected light becomes small and it is reflected in a state of being almost parallel, and the reflected light in the state of being almost parallel is reflected by the lens. After that, it is irradiated to the outside as a hot zone in the above-mentioned light distribution pattern. As described above, by simply providing at least one reflecting surface element of the reflecting surface element group of the reflecting surface with a portion whose radius of curvature is larger than that of the other portion, the luminous intensity is 300 cd or more. The hot zone can be easily formed in the lamp having the above performance.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a vehicular lamp according to the present invention will be described below with reference to FIGS. In this example, the vehicle lamp is a back lamp of the rear combination lamps. In the figure, FIG.
The same reference numerals as those shown in FIGS.

The vehicular lamp of the present invention in this embodiment is provided with at least one reflecting surface of the reflecting surface element group 30 of the diffusive reflecting surface portion consisting of the reflecting surface element group of the above-mentioned so-called vertical prismatic diffusing prism. The radius of curvature of a portion 300 of the element 30 (particularly, the central reflection surface element 30 of the reflector 3 that constitutes the reflection surface element group 30) is larger than the radii of curvature of the other portions 301 and 302. That is, as shown in FIGS. 1 and 3, the radius of curvature of the central portion of one reflective surface element 30 is large (see FIG. 3D), and the radius of curvature of the upper end portion and the lower end portion 301 is small. 3 (see FIGS. 3A and 3G), the radius of curvature of the portion between the central portion 300 having a large radius of curvature and the upper and lower end portions 301 having a small radius of curvature is from the upper and lower end portions to the central portion. It gradually changes to a large value (Fig. 3
(See (B), (C), (E), (F)).

Since the vehicular lamp of the present invention in this embodiment is constructed as described above, when the light source bulb 4 is turned on, the light from the light source bulb 4 has a large radius of curvature in the group of reflective surface elements 30. Other than the portion 300 (including the portion of the gradually changing portion 302 near the central portion 300 where the radius of curvature is large) (the portion of the gradually changing portion 302 near the upper and lower end portions 301 where the radius of curvature is small) (Including the part), the light from the light source bulb 4 is diffusely reflected in the horizontal direction,
The reflected light diffused in the horizontal direction is diffused in the vertical direction by the surface element group 20 on the inner surface of the lens 2 and is radiated to the outside through the lens 2 in the predetermined light distribution pattern shown in FIG.
On the other hand, when the light from the light source bulb 4 is diffused and reflected in the portion 300 having a large radius of curvature (including the portion of the gradually changing portion 302 near the central portion 300 having a large radius of curvature), the reflected light is diffused. Is reduced and the light is reflected in a substantially parallel state, and the reflected light in a substantially parallel state is emitted to the outside as the hot zone HZ in the light distribution pattern through the lens 2.

As described above, in the central portion 300 of at least one reflecting surface element 30 of the reflecting surface element 30 group of reflecting surfaces, a portion whose radius of curvature is larger than the radius of curvature of the upper and lower end portions 301 is simply formed. By providing the hot zone, it is possible to easily form the hot zone in the lamp having the luminous intensity of 300 cd or more.

In particular, in this embodiment, the portion having a large radius of curvature is provided on the reflecting surface element 30 at the innermost portion in the center of the reflector 3, so that it looks good.

The reflective surface element group 30 is formed by depositing aluminum on the surface of the reflector 3 made of synthetic resin.

Further, in the above-mentioned embodiment, the example of the back lamp A of the rear combination lamps as the vehicular lamp has been described, but the present invention can be applied to other vehicular lamps.

Further, in the above-described embodiment, the reflector 3 including the reflecting surface elements 30 is separate from the lamp housing 1.
However, the group of reflective surface elements 30 may be directly provided on the lamp housing 1.

Furthermore, in the above-mentioned group of reflective surface elements 30 of the so-called vertical prismatic diffusion prism, each reflective surface element 3 is included.
The radii of curvature of 0 may be different from each other.

Furthermore, the reflecting surface element 30 of the reflector 3
A group of so-called slab-shaped diffuse prism reflecting surface elements is used for the group, and a group of so-called horizontal or semi-diffusing prism surface elements is used for the group 20 of surface elements on the inner surface of the lens 2.
On the contrary, the reflective surface elements 30 of the reflector 3 are so-called horizontal or horizontal diffusing prism reflective surface element groups, and the inner surface of the lens 2 is a so-called vertical or horizontal diffusing prism surface element group. , Each may be used.

Furthermore, in the above-mentioned embodiment,
The part having a large radius of curvature is provided in one central portion 300 of one reflecting surface element 30, but one reflecting surface element 30 is provided.
A plurality of reflective surface elements 30 may be provided with a large radius of curvature at one or more locations.

[0024]

As is apparent from the above, in the vehicular lamp of the present invention, at least one reflecting surface element of the reflecting surface element group of the reflecting surface has a radius of curvature larger than that of the other portions. By simply providing the part that is
The hot zone HZ can be easily formed in the lamp having the performance of 00 cd or more.

[Brief description of the drawings]

FIG. 1 is a perspective view of a reflector used for a back lamp of a rear combination lamp as a vehicle lamp, showing an embodiment of a vehicle lamp of the present invention.

FIG. 2 is an explanatory diagram showing a light distribution pattern on a screen.

FIG. 3 is a cross-sectional view at each place in FIG.
(A) is a sectional view taken along the line AA, (B) is a sectional view taken along the line BB,
(C) is a sectional view taken along the line C-C, (D) is a sectional view taken along the line D-D,
(E) is a sectional view taken along the line EE, (F) is a sectional view taken along the line FF,
(G) is a GG line sectional view.

FIG. 4 is a front view of a conventional vehicle lamp, showing a rear combination lamp including a back lamp as the vehicle lamp.

FIG. 5 is a sectional view taken along line VV in FIG. 4;

FIG. 6 is a sectional view taken along line VI-VI in FIG. 4;

FIG. 7 is a perspective view of a reflector forming a reflecting surface.

FIG. 8 is an explanatory diagram showing a light distribution pattern on a screen.

[Explanation of symbols]

A: Back lamp of rear combination lamp (vehicle lamp), 1 ... Lamp housing, 2 ... Lens, 20
... Group of surface elements (horizontal hull-shaped diffuse prism element group), 3
... Reflector, 30 ... Diffuse reflection surface section (vertical prismatic diffusion prism element group), 31 ... Rotation paraboloid reference surface, 3
00 ... a portion having a large radius of curvature in the central portion, 301 ... a portion having a small radius of curvature in the upper and lower end portions, 302 ... a gradually changing portion between the central portion and the upper and lower end portions, 4 ... a light source bulb, HZ ... hot zone .

Claims (3)

[Claims] 1. A lamp chamber is defined by a lamp housing and a lens, and a reflecting surface and a light source bulb are arranged in the lamp chamber, and light from the light source bulb is reflected by the reflecting surface and In a vehicular lamp that is radiated to the outside through a lens in a predetermined light distribution pattern, the reflecting surface is a part of a convex cylindrical surface with respect to a reference surface of a paraboloid of revolution, and diffuses light from the light source bulb. And a part of at least one reflecting surface element of the reflecting surface element group has a larger radius of curvature than that of the other part. Light fixture. 2. The reflecting surface element group comprises a part of a convex cylindrical surface of a vertical axis with respect to a reference surface of a paraboloid of revolution, and diffuses light from the light source bulb in a horizontal direction, The inner surface of the lens is formed by a part of a convex cylindrical surface of a horizontal axis, and a surface element group for diffusing light from the reflective surface element group in a vertical direction is provided. Vehicle lighting. 3. The reflection surface element group is formed of a part of a convex cylindrical surface of a horizontal axis with respect to a reference surface of a paraboloid of revolution, and diffuses light from the light source bulb in a vertical direction, The inner surface of the lens is formed of a part of a convex cylindrical surface of a vertical axis, and is provided with a surface element group that diffuses light from the reflective surface element group in the horizontal direction. Vehicle lighting.