JPS6343842B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a lamp. In particular, a vehicle in which a light source is disposed at approximately the focal point of the reflective surface within a lamp chamber defined by a housing having a reflective surface approximately in the shape of a paraboloid of revolution and a lens disposed on the front surface of the housing. Regarding lighting equipment.

As mentioned above, when a light fixture with a built-in reflector is used in a car's rear signal light, sunlight enters the light chamber during the daytime, is reflected by the reflector, and then radiates back out to the outside of the light chamber. This phenomenon occurs. Furthermore, at night, a similar phenomenon occurs due to the incidence of street lights and the like. For this reason, there is a problem in that even when the lamp is off, it appears as if it is on, making it difficult to distinguish between when the lamp is off and when it is on.

For example, Fig. 1 shows an example of a conventional structure, in which during the daytime sunlight, shown by the solid line, passes through lens a and enters lamp chamber b, and the reflection provided in housing c It is reflected by surface d, resulting in reflected light indicated by a broken line. This reflected light has a regular reflection component and a diffuse reflection component, but in either case, the light reflected forward passes through the lens a again and is emitted to the outside. Due to this emitted light, even when the lamp is not lit, it may appear as if the lamp is lit. The fact that it is difficult to distinguish between lighting and non-lighting is extremely problematic for signal lights that provide information by making the necessary signals visible when lighting.

In view of these circumstances, an object of the present invention is to provide a lamp that increases the ratio of the lamp brightness when the lamp is off and when it is on, thereby making the difference between the two noticeable, thereby improving visibility. do.

Hereinafter, an example of implementation of the present invention will be described with reference to the drawings.

FIGS. 2 and 3 show an embodiment in which the present invention is applied to a rear signal light for an automobile.

As shown in the illustrated example, the lamp according to the present invention has a housing 2 having a reflecting surface 1 having a substantially paraboloid of revolution shape.
, a lens 3 disposed on the front surface thereof, and a light source 5 disposed approximately at the focal point of the reflective surface 1 within the lamp chamber 4 defined by the housing and the lens.

However, in the present invention, the lens 3
In addition, a large number of reflecting portions are formed in which substantially parallel reflected light emitted from the light source 5 and reflected by the reflective surface 1 is reflected in two stages and emitted as substantially parallel light in front of the lens 3; The invention is characterized in that the reflecting section is provided with a light shielding section that blocks a part of external light.

That is, in the illustrated embodiment, the lens 3 is composed of an outer lens 6, an outer inner lens 7b, and an inner inner lens 7a. forming a striped inner reflective portion 71a;
The outer inner lens 7b has the inner reflective portion 71a.
A large number of outer reflecting portions 71b are formed to reflect light sent from the outer lens 6 toward the outer lens 6.
In addition, the outer inner lens 7a and the inner inner lens 7b are combined so that the light shielding part 8 is sandwiched between the reflecting parts 71a and 71b, and the reflecting parts 71a and 71b are compatible with each other as described above. Configure.

More specifically, the reflective surface 1 is formed by coating or vapor-depositing a reflective film on the inner surface of the housing 2 or by other means, and has an approximately paraboloid of revolution shape that directs the light from the light source 5 forward. It has the function of emitting substantially parallel light beams. In addition, in the present invention, the light directed toward the lens 3 does not necessarily have to be an accurate parallel ray, and it is also possible to use a light that does not deviate extremely from parallel rays.
This reflective surface 1 is not formed directly on the housing 2,
A separate reflecting plate may be arranged inside the lamp chamber.

On the other hand, the inner reflective portion 7 of the inner inner lens 7a
1a is constructed by cutting a reflective prism P1 on the front surface of the inner inner lens 7a, as shown in detail in FIG. Therefore, the light sent from the reflective surface 1 toward the lens 3 first enters the flat light-receiving surface 72a of the inner inner lens 7a, and then enters the prism P1.
The light is reflected by the inner reflecting portion 71a, which is a reflecting surface, and is sent to the outer inner lens 7b. A reflective prism P is also provided on the rear surface of the outer inner lens 7b, that is, the surface facing the inner inner lens 7a.
2, and both prisms P1 and P2 are combined so as to fit together as shown in the figure. The reflective surface of the prism P2 is the outer reflective part 71 of the outer inner lens 7b.
b, the light sent from the inner inner lens 7a is reflected by the outer reflecting portion 71b, emitted forward, and enters the outer lens 6. That is, the reflecting portions 71a and 71b of this example both form total reflection surfaces, and play the role of totally reflecting the light received by the respective prisms P1 and P2 and sending it in a predetermined direction.

The inner reflecting portion 71a and the outer reflecting portion 71b are located opposite to each other, and the light shielding portion 8 is sandwiched between the reflecting portions 71a and 71b. Although the black sheet-shaped light shielding section 8 is used in this example, the present invention is not necessarily limited to such an embodiment, and the light shielding section may be provided on the reflective section 71a or 71b by a method such as painting or vapor deposition. You can also do it.

The light emitted from the outer inner lens 7b enters the outer lens 6 as a substantially parallel light beam, but in this example, a fisheye prism 9 is formed on the surface of the outer lens 6 on the lamp chamber 4 side. The light is controlled so that the light is emitted forward. In this example, a colored transparent lens such as acrylic resin is used as the outer lens 6, and colorless and transparent lenses are used as both inner lenses 7a and 7b.

In addition, as shown in FIG. 5, instead of forming a fisheye prism on the outer lens 6, a fisheye prism 9 may be formed on the front surface of the outer inner lens 7b. Alternatively, as shown in FIG. 6, a cylindrical prism 91 is formed on the front surface of the outer inner lens 7b, extending from the plane of the paper in FIG. In other words, a cylindrical prism 92 extending from left to right in FIG.

The fisheye prism 9 in the example of FIG. 2 is formed in a lattice shape as shown in the figure, and both inner lenses 7a, 7
The reflective prisms P1 and P2 of b also correspond to this, but the fisheye prism may be formed in an annular shape (concentric circles) and the reflective prisms may also be made to correspond to this.

Because of the above configuration, as shown in Figure 7, intrusion light from the outside (sunlight, etc.) is shown by the solid line.
The incoming light is divided into that which is blocked by the light shielding part 8 and that which enters the lamp chamber 4, and only a part of the intruding light passes through both inner lenses 7a and 7b and enters the lamp chamber 4.
The light beam entering the lamp chamber 4 is reflected by the reflecting surface 1 as shown by the broken line, and only a very small portion of it passes through both the inner lenses 7a and 7b, is emitted to the outside via the outer lens 6, and is reflected by the reflection surface 1 as shown by the broken line. Other than that, light shielding part 8
blocked by. Therefore, the light shielding part 8 has the function of cutting off most of the intruding light that is about to enter the lamp chamber 4, and also cuts off the light that is reflected by the reflective surface 1 and about to go out to the outside. Since the light that is reflected by the reflective surface 1 and attempts to be emitted to the outside is not necessarily proper emitted light, it is possible to virtually cut out most of the reflected and emitted light due to the intruding light.

On the other hand, when the light source 5 is turned on, as described above, as shown in FIG. 4, the light emitted from the light source 5 is
It is reflected by the reflective surface 1, and the entire reflected light enters the light receiving surface 72a of the inner inner lens 7a, and each reflective portion 71
It is reflected in two stages by a and 71b and is emitted forward through the outer lens 6 as substantially parallel light. Therefore, no light is blocked by the light shielding part 8, and all the light from the light source 5 reflected by the reflective surface 1 contributes to light emission. Therefore, the effective amount of light is large, and good visibility can be maintained despite the presence of the light shielding body.

As described above, according to the configuration of the present invention, intruding light such as sunlight rarely enters when the light is turned off, and even if it does enter, almost no light is emitted to the outside. Therefore, the problem of giving the same impression as when the light is on even when the light is off is solved. Furthermore, when the light source is turned on, the entire amount of light from the light source is emitted and contributes to light emission, so visibility is good and the difference from when the light is off can be made noticeable. Therefore, the function as a signal light can be properly achieved.

As described in detail above, the lamp of the present invention has a housing that has a reflecting surface that is approximately in the shape of a paraboloid of revolution, and a lens that is disposed on the front surface of the housing. In a lamp comprising a light source disposed at a focal position, substantially parallel reflected light emitted from the light source and reflected by the reflecting surface is reflected by the lens in two stages, and is reflected in front of the lens as substantially parallel light. In addition to forming a large number of reflective parts that emit light, a light shielding part is provided in the reflective part to block part of the external intruding light, so that when the light is turned on, all the light that is emitted from the light source and reflected by the reflective surface is effective. When the light is not lit, the light is blocked to prevent intruding light from outside from entering the lamp chamber and from being reflected by the reflective surface and re-emitting from the lens surface. The difference in lamp brightness between when the lamp is off and when it is on is large, and it does not appear as if the lamp is on when it is off, which has the effect of achieving good visibility.

[Brief explanation of the drawing]

FIG. 1 shows a sectional view of a conventional example. 2 to 4 and 7 show an example of the implementation of the present invention, FIG. 2 is a front view, FIG. 3 is a sectional view taken along the line -- in FIG. FIG. 5 and 6A are partial sectional views of modified examples of the above example, and FIG. 6B is a sectional view taken along the Ro-Ro line in FIG. 6A. DESCRIPTION OF SYMBOLS 1... Reflective surface, 2... Housing, 3... Lens, 4... Light chamber, 5... Light source, 6... Outer lens, 7a... Inside inner lens, 71a...
Reflection part, 7b... Outer inner lens, 71b...
...Reflection part, 8... Light shielding part.

Claims (1)

[Claims] 1. In a lamp comprising a light source disposed approximately at the focal point of the reflective surface within a lamp chamber defined by a housing having a reflective surface approximately in the shape of a paraboloid of revolution and a lens disposed in front of the housing. , to the lens,
A plurality of reflecting portions are formed in which substantially parallel reflected light emitted from the light source and reflected by the reflecting surface is reflected in two stages and emitted as substantially parallel light in front of the lens, and an external A lamp characterized by having a light shielding part that blocks part of intruding light.