JPS6116123B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a lamp. In particular, the present invention relates to a lamp in which a light source is disposed within a lamp chamber defined by a housing having a reflective surface and a lens disposed on the front surface of the housing.

This type of lamp is used, for example, as a signal lamp for vehicles. However, when a light fixture with a built-in reflector like this is used in a car's rear signal light, sunlight enters the light chamber during the day, is reflected by the reflector, and then returns to the outside of the light chamber. A phenomenon of radiation occurs. Furthermore, at night, a similar phenomenon occurs due to the incidence of street lights and the like. For this reason, even when the lamp is off, it appears as if it were on, and there is a problem in that it is 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. This emitted light makes it appear as if the lamp is lit even when it is not lit. In this way, it is difficult to distinguish when the lights are on and when the lights are not on, which is not only an extremely problem for signal lights that provide information by making the necessary signals visible when the lights are on, but also for general lighting equipment. This means that it gets worse. Therefore, not only is this a problem in terms of achieving its function as a signal light, but it is also undesirable as a general lighting device.

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. shall be.

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

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

That is, the lamp according to the present invention has a light source 5 disposed within a lamp chamber 4 defined by a housing 2 having a reflective surface 1 and a lens 3 disposed on the front surface of the housing 2, as shown in the illustrated example. It is something. In the lamp of the present invention, each of the reflective surfaces 1 has a light condensing effect, and the reflective areas 11, 12, . . . have different light condensing directions.
A light shielding body 6 is composed of a light shielding body 6, and has transparent parts 61, 62, . . . between the front lens 3 and the reflective surface 1.
Place. Further, each reflective area 11 of the reflective surface 1,
The reflecting surfaces A1, A2... reflected by the light shielding body 6 are configured to transmit light through the light-transmitting portions 61, 62... of the light shielding body 6 and emit the light to the front surface.

More specifically, the reflective surface 1 in this example is formed by coating or vapor depositing a reflective film on the inner surface of the housing 2 or by other means. Thus, the housing 2 itself has an inner surface with each reflective area 11,
12... Alternatively, the reflecting surface 1 may be configured by disposing a separate reflecting plate inside the lamp chamber.

Each of the reflecting areas 11, 12... is a concave mirror, and has a condensing effect so that the light A1, A2... from the light source 5 is brought into focus F1, F2... in the lamp chamber 4, respectively. . The light condensed at each focal point F1, F2... is exactly the same as the light transmitting portions 61, 62... of the light blocking body 6.
The light enters the lens 3 while being diffused through the light. At this time, the reflective areas 11, 12, . . . and the light shield 6 are set so that the light enters the entire surface of the lens 3.

As shown in FIG. 2, the illustrated light blocking body 6 has a front rectangular lens 3 formed in a vertically cross-linked manner, and the light-transmitting parts 61, 62... cross the lamp chamber 4 in the vertical direction. It's taking shape. Each reflective area 11, 12...
In accordance with this, each of the transparent parts 61, 62, 63
It is set so that the reflected light can be emitted in the ... direction. Of course, such transparent parts 61 and 62 may be configured to have a horizontal striped shape, a divided rectangular shape, a lattice shape, etc., or may be formed radially, and the shape may be changed as desired. It can be set arbitrarily. Each reflective area is also focused in accordance with the shape of its transparent portion so that light is emitted from the reflective area to the front surface. In addition to using a reflective surface that condenses light to one point, a surface that connects so-called "focal lines" that condense light in a single line may be used as each reflective area.

The light incident on the front lens 3 is controlled by a prism 31 formed on the lens 3, and is emitted forward. As described above, since the structure is such that light is incident on the entire surface of the lens 3, light is emitted uniformly over the entire surface of the lens 3.

With the above configuration, when the light is turned off, the light chamber 4 can be accessed from the outside.
The amount of light that enters is restricted, and the amount of light that is re-reflected and emitted is also significantly reduced. That is, in the daytime, as shown in FIG. 4, even if the sunlight shown by the solid line enters the lamp chamber 4, it must pass through the light shield 6 in order to reach the reflective surface 1. ,
Most of the light is blocked here. Part of the transparent part 6
1, 62... and reaches the reflective surface 1, where it is diffusely reflected, but since this reflected light is not from the light source 5, it is not reflected in the direction of the lens 3.
Most don't go to the front. A very small portion of the light is emitted forward, but most of it is again blocked by the light shield 6. Therefore, the light blocking body 6 blocks most of the light entering from the outside to prevent it from reaching the reflecting surface 1, and also cuts out most of the small amount of light that is reflected and emitted forward again. Therefore,
In fact, it cuts out most of the intruding light (sunlight, etc.) from the outside.

On the other hand, when the light source 5 is turned on, the light from the light source 5 is reflected by each reflective area 11, 12... and once condensed, all of the light passes through the transmitting parts 61, 62... and covers the entire surface of the lens 3. Since it emits light as if it were irradiating,
In the end, all the light from the light source 5 contributes to light emission, the effective amount of light is large, and the amount of emitted light remains unchanged despite the presence of the light shield 6. Therefore, good visibility can be maintained. Incidentally, the prism 31 of the lens 3 is naturally designed so that the incident light from each of the reflection areas 11, 12, . . . can be controlled to a necessary light distribution as a signal light.

As described above, according to such a configuration, there is little sunlight etc. when the lights are turned off, and even if the light is incident, almost no light is emitted to the outside. Therefore, the problem of giving the same impression as when the lights are on even when the lights are off is solved. In addition, 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 at the same time, the difference from when the light is off is noticeable. Therefore, the function as a signal light can be properly achieved.

As detailed above, the lamp of the present invention includes a light source disposed within a lamp chamber defined by a housing provided with a reflective surface and a lens disposed on the front surface of the housing, each of which has a reflective surface. A light blocking body is arranged between a front lens and the reflective surface, and is composed of a plurality of reflective areas having a light condensing effect and different light converging directions. The light reflected on the reflective area is characterized by a structure in which the reflected light passes through the light-transmitting part of the light blocking body and is emitted to the front, so that when the light is turned on, the reflected light is emitted from the light source and reflected on the reflective surface. All of the emitted light functions as effective light emission, increasing the brightness, and when the light is not lit, the light blocking section prevents intruding light (sunlight, etc.) from entering the lamp chamber, and the incident light is blocked by the reflective surface. This prevents light from re-emitting from the lens surface, which increases the difference in lamp brightness between when the lamp is off and when it is on, and it does not appear as if the lamp is on when it is off, achieving good visibility. has.

It should be noted that, as a matter of course, the present invention is not limited to the illustrated embodiments.

[Brief explanation of the drawing]

FIG. 1 shows a sectional view of a conventional example. 2 to 4 show an example of the implementation of the present invention, FIG. 2 is a partially cutaway front view, FIG. 3 is a sectional view taken along the - line in FIG. 2, and FIG. 4 is a sectional view showing the operation. be. 1... Reflective surface, 11, 12... Reflective area, 2...
...Housing, 3...Lens, 4...Light chamber, 5...
...Light source, 6... Light blocking body, 61, 62... Transparent part.

Claims (1)

[Claims] 1. In a lamp in which a light source is disposed within a lamp chamber defined by a housing provided with a reflective surface and a lens disposed on the front surface of the housing, each of the reflective surfaces has a light condensing function and a direction in which the light condenses. A light blocking section is configured from a plurality of different reflecting areas, and is provided with a light-transmitting section between the lens and the reflecting surface,
A lamp characterized in that the reflected light reflected by each reflective area of the reflective surface is transmitted through a light-transmitting part of the light blocking body and emitted to the front surface.