JPS6235401A - Lamp apparatus for vehicle - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a vehicular lamp, and more particularly to a vehicular lamp with a double lens structure and a direct-light type.

[Conventional technology]

The conventional vehicle lamp of this type is Utility Model No. 58-10302.
As typified by the one described in the above publication, a housing, an inner lens and an outer lens integrally molded with a Fresnel prism arranged on the front surface of the housing, and a lamp chamber defined by the inner lens and the housing are arranged. The inner lens has a refractive prism near the bulb on the back surface (the surface facing the bulb), a total reflection prism around the refractive prism on the back surface, and a total reflection prism on the back surface (the surface facing the bulb). A diffusing prism is provided on the opposite side of the camera.

[Problem that the invention seeks to solve]

However, in conventional vehicle lamps, a refractive prism or a total reflection prism is installed on the back surface of the inner lens, and a diffusing prism is installed on the front surface of the inner lens. The brightness at the center of the lens is extremely high compared to the periphery. Furthermore, when the outer lens is installed near the focal point of the diffusing prism of the inner lens, the brightness is partially increased (near the focal point of the diffusing prism). As described above, there is a problem in that a fairly uniform light distribution pattern cannot be obtained.

An object of the present invention is to obtain a substantially uniform light distribution pattern. Our objective is to provide lighting equipment for vehicles.

[Means for solving problems]

The present invention is characterized in that a retroreflection prism is provided near the bulb on the surface of the inner lens.

[Effect]

In the present invention, the luminous flux incident on the inner lens is retroreflected by the retroreflection prism and cannot be emitted from the inner lens, and the brightness of the inner lens near the bulb provided with the retroreflection prism can be lowered.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS Twelve examples of the vehicle lamp according to the present invention will be described below with reference to the accompanying drawings.

1 to 3 show a first embodiment of a vehicle lamp according to the present invention, in which FIG. 1 is a partial sectional view, FIG. 2 is an enlarged view of the vicinity of the bulb of the inner lens, and FIG. 1 is a graph comparing the luminance distribution of the vehicle lamp of the invention with the luminance distribution of a conventional vehicle lamp.

In the figure, l is the housing, 2 and 3 are the inner and outer lenses arranged on the front side of the housing 1, and 4
is a bulb disposed within a lamp chamber 10 defined by the inner lens 2 and the housing IK. The inner lens 2 has a refractive prism 20 on the back near the bulb 4, a total reflection prism 21 around the refractive prism 20 on the back, and a retroreflective prism with the same prism and the same pitch near the bulb 4 on the front. 22 is provided.

Since the vehicle lamp of the present invention in this embodiment has the above-described configuration, the light beam from the bulb 4 is converted into parallel light by the refractive frim of the inner lens 2, as shown in FIG. incident on . The light beam incident on the inner lens 2 undergoes total reflection twice at the retroreflection prism 22, and then the refractive system prism 20 of the inner lens 2
It then returns to the 1° (bulb 4) side of the lamp chamber. As a result, no light beam is emitted from the retroreflective prism 22 near the bulb 4 on the surface of the inner lens 2. Therefore, as shown in Figure 3, near the bulb 4 of the lens (center of the lens)
Compared to conventional vehicle lights, the brightness of the lamp is lower than that of conventional vehicle lamps, and there is no significant difference in brightness compared to the surrounding area, resulting in a more uniform light distribution pattern and a more uniform appearance.

FIG. 4 is an enlarged view of an inner lens showing a second embodiment of the present invention.

In this embodiment, the vehicle lamp of the present invention has a reference surface (a surface in the normal direction of the optical axis A) at the tip of the retroreflective prism 22 around the outer periphery of the retroreflective prism 22 of the inner lens 2. It is equipped with parallel semi-transparent flat blades.

Of the light beams incident on the inner lens 2, the light beams that reach the semi-transparent plane part 23 are emitted from the surface of the inner lens 2 as parallel light beams, and the other light beams are transmitted through the retroreflection prism 22. Retroreflection and bulb 4
Return to the side. Therefore, the brightness near the bulb 4 of the lens (the center of the lens) is reduced, and some transmitted light flux is obtained around the center of the lens.

FIG. 5 is an enlarged view of an inner lens showing a third embodiment of the present invention.

The vehicular lamp of the present invention in this embodiment has the above-mentioned second
In the vehicle lamp according to the embodiment, the area of the semi-transparent plane part n is increased toward the outer periphery, as shown in the following formula (1).

P, (P, (P3(...)
-Pn-(1) With this configuration, a transmitted light flux that gradually increases from the center to the outer periphery of the lens can be obtained.

FIG. 6 is an enlarged view of an inner lens showing a fourth embodiment of the present invention.

In the vehicle lamp of the present invention in this embodiment, the density i of the retroreflective prism 22 of the inner lens 2 is made sparser from the center of the lens toward the outer periphery, and between the elements of the retroreflective prism n, there is a A parallel semi-transparent plane 24 is provided. With this configuration, the same effects as those of the second embodiment described above can be obtained.

FIG. 7 is an enlarged view of an inner lens showing a fifth embodiment of the present invention.

The vehicle lamp of the present invention in this embodiment is the above-mentioned fourth
In the vehicle lamp according to the embodiment, the retroreflective prism 2 on the inner and outer periphery of the retroreflective prism 22 of the inker lens 2
A semi-transparent plane part 23 is provided at the tip of the mirror 2, which is substantially parallel to the reference plane. With this configuration, a transmitted luminous flux υ higher than that of the fourth embodiment described above can be obtained.

FIG. 8 is an enlarged view of an inner lens showing a sixth embodiment of the present invention.

The vehicle lamp of the present invention in this embodiment is the above-mentioned fourth
In the vehicle lamp of the embodiment, the inner and outer retroreflective prisms 2 of the inner lens 2 are
A semi-transparent inclined surface part is provided at the tip of the inner lens 2 at an angle θ'' with respect to the reference plane.With this configuration, out of the light beam incident on the inner lens 2, the semi-transparent inclined surface 25 The light beam that has reached θ0 is diffused and emitted from the surface of the inner lens 2 at an exit angle θ0.The light beam that has reached the semi-transparent plane 24 is emitted as a parallel light beam from the surface of the inner lens 2, and the other light beams are emitted from the retroreflection prism 22. It is retro-reflected and returns to the valve 4 side.

FIG. 9 is an enlarged view of an inner lens showing a seventh embodiment of the present invention.

The vehicular lamp of the present invention in this embodiment is the first one described above.
In the vehicle lamp according to the embodiment, the retroreflective prism 22
Of these, a semi-transmissive inclined surface part is provided at the tip of the retroreflective prism 22 on the outer periphery, which is inclined at an angle θ'' with respect to the reference plane. Among the light beams, the light beam that has reached the semi-transparent inclined surface 25 is diffused out from the surface of the inner lens 2 at an exit angle θ0, and the other light beams are retroreflected by the retroreflection prism 22 and returned to the bulb 4 side.

FIG. 10 is an enlarged view of an inner lens showing an eighth embodiment of the present invention.

The vehicular lamp of the present invention in this embodiment is the first one described above.
In the vehicle lamp according to the embodiment, the tip of the retroreflective prism 22 of the inner lens 2 has an angle θ' with respect to the reference plane.
. A semi-transparent inclined surface portion is provided.

FIG. 11 is an enlarged view of an inch lens showing a ninth embodiment of the present invention.

The vehicle lamp of the present invention in this embodiment is the seventh embodiment described above.
In the vehicle lamp according to the embodiment, the area of the semi-transparent inclined surface 25 is increased toward the outer periphery, as shown in equation (2) below.

P'<P2'<・・・・・・・・・Pn'
- (2) With this configuration, a transmitted diffused light flux that gradually increases from the center to the outer periphery of the lens can be obtained.

FIG. 12 is an enlarged view of an inner lens showing a tenth embodiment of the present invention, and FIG. 13 is an enlarged view of the xT1 portion in FIG. 12.

The vehicular lamp of the present invention in this embodiment is the first one described above.
In the vehicle lamp of the embodiment, the inner and outer retroreflective prisms 2 of the inner lens 2 are
A spherical diffusion prism 26 with a radius of about 100 psi is provided at the tip of the prism 2. With this configuration, as shown in FIG. 13, among the light beams incident on the inner lens 2,
The light beam that has reached the spherical diffuser prism 26 is diffused out from the surface of the inner lens 2 at an exit angle θ0, and the other light beams are retroreflected by the retroreflection prism 22 and returned to the bulb 4 side.

FIG. 14 is an enlarged view of an inner lens showing an eleventh embodiment of the present invention.

The vehicular lamp of the present invention in this embodiment is the first one described above.
In the vehicle lamp according to the embodiment, a spherical diffuser prism 26 having a radius of about 100 psi is provided at the tip of the retroreflective prism 22 of the inner lens 2.

FIG. 15 is an enlarged view of an inner lens showing a twelfth embodiment of the present invention.

The vehicular lamp of the present invention in this embodiment is the first one described above.
In the vehicle lamp according to the embodiment No. 0, the radius of the spherical diffusion prism 26 increases as it goes toward the outer periphery, as shown in equation (3) below.

R□<R2<R3<・・・・・・・・・Rn−+
3) The above-mentioned retroreflection prism 22 is composed of a concentric prism, a lattice prism, a linear (straight line only) prism, etc.

〔Effect of the invention〕

As is clear from the above, in the vehicle lamp of the present invention, the retroreflective prism is provided on the surface of the inner lens near the bulb, so that the light beam incident on the inner lens is retroreflected by the retroreflective prism and returns to the bulb side. . Therefore, the brightness near the bulb equipped with the retroreflective prism of the inner lens can be lowered, and the brightness can be lowered, unlike conventional vehicle lights.
When the outer lens is disposed near the focal point of the diffusing prism of the inner lens, it is possible to prevent the brightness from increasing locally, and a more uniform light distribution pattern can be obtained, resulting in a more uniform appearance.

[Brief explanation of the drawing]

1 to 3 show a first embodiment of a vehicle lamp according to the present invention, in which FIG. 1 is a partial sectional view, FIG. 2 is an enlarged view of the vicinity of the bulb of the inner lens, and FIG. 1 is a graph comparing the luminance distribution of the vehicle lamp of the invention with the luminance distribution of a conventional vehicle lamp. FIG. 4 is an enlarged view of an inner lens showing a second embodiment of the present invention. FIG. 5 is an enlarged view of an inner lens showing a third embodiment of the present invention. FIG. 6 is an enlarged view of an inner lens showing a fourth embodiment of the present invention. FIG. 7 is an enlarged view of an inner lens showing a fifth embodiment of the present invention. FIG. 8 is an enlarged view of an inner lens showing a sixth embodiment of the present invention. FIG. 9 is an enlarged view of an inner lens showing a seventh embodiment of the present invention. FIG. 10 is an enlarged view of an inner lens showing an eighth embodiment of the present invention. FIG. 11 is an enlarged view of an inner lens showing a ninth embodiment of the present invention. □First
FIG. 2 is an enlarged view of an inner lens showing a tenth embodiment of the present invention, and FIG. 13 is an enlarged view of the part 2 in FIG. FIG. 14 is an enlarged view of an inner lens showing an eleventh embodiment of the present invention. FIG. 15 is an enlarged view of an inner lens showing a twelfth embodiment of the present invention. 1...Housing, 2...Inner lens, n...
・Retroreflective prism, 3... Outer lens, 4...
·valve.

Claims (1)

[Claims] A vehicle lamp comprising a housing, an inner lens and an outer lens integrally molded with a Fresnel prism arranged on the front surface of the housing, and a bulb arranged in a lamp chamber defined by the inner lens and the housing. A vehicle lamp characterized in that a retroreflective prism is provided on the surface of the inner lens near the bulb.