JPH09167504A - Vehicle lighting - Google Patents

Abstract

(57) Abstract: A hot zone can be easily formed in a lamp having a luminous intensity of 300 cd or more. SOLUTION: On the reflection surface, a diffuse reflection surface portion 30 which diffuses and reflects light from the light source bulb 4 and a light from the light source bulb 4 which is a part of a paraboloid of revolution are reflected in parallel to form a hot zone HZ. Parallel reflecting surface portions 5 and 50 are provided. As a result, the light from the light source bulb 4 is diffusely reflected by the diffuse reflection surface portion 30, and the diffuse reflection light is emitted to the outside through the lens 2 in a predetermined light distribution pattern. On the other hand, the light from the light source bulb 4 is reflected in parallel on the parallel reflection surface portions 5 and 50, and this parallel reflection light is emitted to the outside as the hot zone HZ in the above-mentioned light distribution pattern via the lens 2. In this way, the parallel reflecting surface portions 5, 5 are parallel to the reflecting surface.
By simply providing 0, the hot zone can be easily formed in the lamp having the luminous intensity of 300 cd or more.

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. 11).

The reflecting surface 30, as shown in FIG.
A reflecting surface element (so-called vertical prismatic diffusion prism) which is a part of a convex cylindrical surface of a vertical axis with respect to the reference surface 31 of a paraboloid of revolution and diffuses light from the light source bulb 4 in the horizontal direction.
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. 9, 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 reflected by the surface element group 20 on the inner surface of the lens 2. The light is diffused in the vertical direction and is radiated to the outside through the lens 2 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. 11, the hot zone HZ
Has a problem that the hot zone HZ cannot be specified.

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]

In order to achieve the above-mentioned object, the present invention comprises, as a light source, a reflecting surface which is a diffuse reflecting surface portion for diffusing and reflecting light from a light source bulb and a part of a paraboloid of revolution. And a parallel reflection surface portion that reflects light from the bulb in parallel to form a hot zone.

As a result, according to the present invention, the light from the light source bulb is diffused and reflected by the diffuse reflection surface portion, and the diffuse reflection light is emitted to the outside through the lens in a predetermined light distribution pattern. On the other hand, the light from the light source bulb is reflected in parallel on the parallel reflection surface portion, and the parallel reflection light is emitted to the outside as a hot zone in the above-mentioned light distribution pattern through the lens. As described above, by simply providing the parallel reflecting surface portion on the reflecting surface, the hot zone can be easily formed in the lamp having the performance of the luminous intensity of 300 cd or more.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, two examples of embodiments of a vehicular lamp of the present invention will be described with reference to FIGS. 1 to 6. 1 to 5 show a first embodiment of a vehicular lamp according to the present invention. In this example, the vehicle lamp is a back lamp of the rear combination lamps. In the figure, the same reference numerals as those in FIGS. 7 to 11 indicate the same components.

In the figure, 5 is a parallel reflection surface portion. The parallel reflecting surface portion 5 is formed of a part of a paraboloid of revolution (reference surface 31 of the paraboloid of revolution of the reflecting surface 30) and reflects the light from the light source bulb 4 in parallel to form a hot zone HZ as shown in FIG.
Is formed. The parallel reflection surface portion 5 is between the reflection surface element 30 and the reflection surface element 30 of the diffusion reflection surface portion formed of the reflection surface element group of the so-called vertical prismatic diffusion prism, and constitutes this reflection surface. 1 in the center of the reflector 3 (the part through which the rotation axis of the paraboloid of revolution passes, that is, the back part)
It is provided in the place.

Since the vehicular lamp according to the present invention in this embodiment has the above-mentioned structure, when the light source bulb 4 is turned on, the light from the light source bulb 4 is diffused and reflected by the diffuse reflection surface portion 3.
0 is diffusely reflected in the horizontal direction, and the light diffusely reflected 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 passes through the lens 2 in a predetermined light distribution pattern shown in FIG. It is irradiated to the outside. On the other hand, a part of the light from the light source bulb 4 is reflected by the parallel reflection surface portion 5 in parallel with the optical axis (the rotation axis of the above-mentioned rotation paraboloid), and this parallel reflection light passes through the lens 2 and the above-mentioned diagram. It is irradiated to the outside as a hot zone HZ in the light distribution pattern shown in FIG.

As described above, the reflecting surface 30 is parallel to the reflecting surface 30.
It is possible to easily form the hot zone HZ in a lamp having a luminous intensity of 300 cd or more by simply providing the above.

In particular, in this embodiment, since the parallel reflection surface portion 5 is provided at the back of the center of the reflector 3, it looks good.

FIG. 6 is a perspective view of a reflector showing a second embodiment of the vehicular lamp of the present invention. In the figure, the same reference numerals as those in FIGS. 1 to 5 and 7 to 11 indicate the same components.
The vehicular lamp of the present invention in this embodiment is provided at a plurality of positions between the reflecting surface element 30 and the reflecting surface element 30 of the diffusive reflecting surface portion including the reflecting surface element group of the above-mentioned so-called vertical prismatic diffusing prism. The parallel reflection surface portion 5 which is a part of the rotation paraboloid (reference surface 31 of the rotation paraboloid of the reflection surface 30) and reflects the light from the light source bulb 4 in parallel to form the hot zone HZ.
0 is provided respectively. The vehicular lamp of the present invention in this second embodiment can achieve the same effects as the vehicular lamp of the present invention in the above-mentioned first embodiment.

4 and 6, the parallel reflection surface portions 5 and 50 are shown by lattice hatching, but in reality, the surface of the reflector 3 made of synthetic resin is vapor-deposited with aluminum. .

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 reflecting surfaces 30, 5, 50 are provided on the reflector 3 which is separate from the lamp housing 1, but the reflecting surfaces 30, 5, 50 are provided directly on the lamp housing 1. May be.

Furthermore, in the reflection surface element 30 of the diffusion reflection surface portion composed of the reflection surface element group of the so-called vertical prismatic diffusion prism and the surface element 20 composed of the so-called horizontal prismatic diffusion prism group described above, Reflective surface element 30 and each surface element 2
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.

[0024]

As is apparent from the above, the vehicular lamp of the present invention can easily form the hot zone HZ in a lamp having a luminous intensity of 300 cd or more by simply providing a parallel reflecting surface portion on the reflecting surface. can do.

[Brief description of the drawings]

FIG. 1 shows a first embodiment of a vehicular lamp of the present invention, and is a front view of a rear combination lamp including a back lamp as a vehicular lamp.

FIG. 2 is a sectional view taken along line II-II in FIG.

FIG. 3 is a sectional view taken along line III-III in FIG.

FIG. 4 is a perspective view of a reflector that constitutes a diffuse reflection surface portion and a parallel reflection surface portion.

FIG. 5 is an explanatory diagram showing a light distribution pattern on a screen.

FIG. 6 is a perspective view of a reflector that constitutes a diffuse reflection surface portion and a parallel reflection surface portion, showing a second embodiment of the vehicle lamp of the present invention.

FIG. 7 is a front view of a conventional vehicle lamp, showing a rear combination lamp including a back lamp as the vehicle lamp.

FIG. 8 is a sectional view taken along line VIII-VIII in FIG. 7;

FIG. 9 is a sectional view taken along line IX-IX in FIG. 7;

FIG. 10 is a perspective view of a reflector forming a reflecting surface.

FIG. 11 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 ... diffusive reflection surface section (group of vertical prismatic diffusion prism elements), 31 ... reference surface of a paraboloid of revolution, 4
... Light source bulbs, 5 and 50 ... Parallel reflective surface portion, HZ ... Hot zone.

Claims (5)

[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 includes a diffuse reflecting surface portion that diffuses and reflects light from the light source bulb, and a part of a paraboloid of revolution. A parallel reflection surface portion that reflects light from a bulb in parallel to form a hot zone, and a vehicular lamp. 2. The diffusive reflection surface portion is composed of a part of a convex cylindrical surface of a vertical axis with respect to a reference surface of a paraboloid of revolution, and is composed of a group of reflection surface elements for diffusing light from the light source bulb in a horizontal direction. The parallel reflection surface portion is provided between the reflection surface element and the reflection surface element of the diffuse reflection surface portion, and is provided at one position in the center of the reflection surface, and the inner surface of the lens is horizontal. The vehicular lamp according to claim 1, further comprising a surface element group that is formed of a part of a convex cylindrical surface of the shaft and diffuses light from the reflecting surface in a vertical direction. 3. The diffusive reflection surface portion is composed of a part of a convex cylindrical surface of a vertical axis with respect to a reference surface of a paraboloid of revolution, and is composed of a group of reflection surface elements for diffusing light from the light source bulb in a horizontal direction. The parallel reflection surface portion is provided at a plurality of positions between the reflection surface element and the reflection surface element of the diffuse reflection surface portion, the inner surface of the lens, from a part of the convex cylindrical surface of the horizontal axis The vehicular lamp according to claim 1, further comprising a surface element group that diffuses light from the reflecting surface in a vertical direction. 4. The diffusive reflection surface portion is composed of a part of a convex cylindrical surface having a horizontal axis with respect to a reference surface of a paraboloid of revolution, and is composed of a group of reflection surface elements for vertically diffusing light from the light source bulb. The parallel reflection surface portion is provided between the reflection surface element and the reflection surface element of the diffuse reflection surface portion, and is provided at one position in the center of the reflection surface, and the inner surface of the lens is vertical. The vehicular lamp according to claim 1, further comprising a surface element group that is formed of a part of a convex cylindrical surface of the shaft and that diffuses light from the reflecting surface in a horizontal direction. 5. The diffusive reflection surface section is composed of a part of a convex cylindrical surface of a horizontal axis with respect to a reference surface of a paraboloid of revolution, and is composed of a group of reflection surface elements for vertically diffusing light from the light source bulb. The parallel reflection surface portion is provided at a plurality of positions between the reflection surface element and the reflection surface element of the diffuse reflection surface portion, the inner surface of the lens, from a part of the convex cylindrical surface of the vertical axis The vehicular lamp according to claim 1, further comprising a surface element group that diffuses light from the reflecting surface in a horizontal direction.