JPH0313837Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a signal light used in a traffic signal or the like.

Conventional technology When external light, such as sunlight or automobile headlights, enters the signal light through the lens of the signal light, that light is reflected by the reflector inside the signal light, passes through the lens again, and is emitted to the outside, causing the light to pass through the signal light. It is known that a pseudo-appearance (phantom) occurs in which the lamp appears to be on even though it is not.

Conventionally, as a method for preventing such pseudo-displays, signal lights as shown in FIGS. 7 and 8 have been known. As shown in the figure, this signal light has a hood 53 equipped with louvers 52 made of a large number of black-painted horizontal light-shielding plates attached to the front of a colored lens 51, and the louvers 52 block or block external light. It is designed to reduce the light. That is, sunlight generally shines in from above, and car headlights shine in from below at a certain angle. Therefore, these external lights are blocked or attenuated by the black-painted horizontal louvers 52. On the other hand, the light emitted from the light source bulb 54 in the signal light is turned into a beam parallel to the optical axis of the paraboloid by the reflecting mirror 55, and is hardly blocked by the louver 52, and is emitted as it is to the outside. It is something that is reflected.

Problems to be solved by the invention In conventional signal lights using louvers, foreign objects such as snow and dead leaves tend to get clogged between the louvers 52, which are spaced apart above and below, and in some cases, birds can nest. This causes various problems in actual use, such as the possibility of creating Further, the louver 52 and the hood 53 are usually made of metal or plastic molded products, but if they are made of metal, it takes time to assemble, and because they need to be lightweight, they are made of a light alloy that has been treated with black. This makes it expensive. Also,
Since the louver 52 is incorporated to the lower side of the hood 53, the outer shape of the hood becomes special, resulting in a problem that the lateral field of view becomes narrow. On the other hand, if it is made of plastic, it is possible to reduce the weight to some extent, but it requires an expensive mold for molding, and the initial investment is large, making it unsuitable unless mass produced. have a problem

The present invention was devised in view of the above circumstances, and provides a signal light of this type that has the same effect of preventing false appearance as a conventional louver by using a completely new and original means for preventing false appearance. It is.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention provides a signal light having a parabolic reflector, a light source bulb, a lens, and a means for preventing pseudo-appearance. The prevention means consists of a film made by cutting thinly in the thickness direction a laminated structure in which transparent layers and light-shielding thin film layers of a predetermined thickness are adhered alternately, and the light source bulb is placed at the focal point of the reflecting mirror. The lens is placed in front of the light bulb, and the false display prevention means is placed in front of the reflector so as to cover the light emitting surface of the signal light.

Function In the signal light having the above structure, the light-shielding thin film layer within the film exhibits a light-shielding effect equivalent to that of a conventional louver, and blocks or attenuates incident external light. Therefore, similar to conventional louvers, the intrusion of extraneous light is effectively prevented, and false displays caused by extraneous light are prevented. On the other hand, the regular light emitted from the light source bulb in the signal light is emitted as a beam parallel to the optical axis by the reflecting mirror, so most of the light is blocked by the light-blocking thin film layer inside the film. Instead, it is radiated to the outside through the transparent layer portion, and a normal signal appearance is achieved.

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows a first embodiment of the present invention, in which 1 is a light bulb for a light source, 2 is a reflecting mirror, and 3 is a lens.
These are conventional signal light structures. The illustrated example shows the lens 3 in such a well-known signal light.
A film 4 having a laminated structure as shown in FIG. 2 is attached to the outer surface of the film.

That is, as shown in FIG. 2, the film 4 has a transparent layer 5 of a predetermined thickness made of, for example, transparent silicone rubber, and a transparent layer 5 of a predetermined thickness made of opaque silicone rubber containing carbon powder. Thin light-shielding thin film layers 6 are adhered alternately, and the light-shielding thin film layers 6 have a laminated structure exhibiting a horizontal striped pattern.

The film 4 having the above laminated structure can be easily produced as shown in FIG. For example, a predetermined thickness
Transparent silicone rubber 7 with a thickness of W ₁ and opaque silicone rubber 8 containing carbon powder with a thickness of W ₂ which is sufficiently thinner than the transparent silicone rubber 7 are alternately laminated and bonded, and then, they are bonded together along the chain line P in the figure. By cutting the film 4 in the longitudinal direction, a film 4 having a predetermined thickness d can be obtained. To give an example of the dimensions of each part, W ₁ =
0.3 mm, W ₂ =0.01 mm, and d=0.8 mm.

In the signal light shown in FIG. 1, in which the film 4 having the above structure is attached to the outer surface of the lens 3, the light-shielding thin film layer 6 in the film 4 has the same effect as the louver in a conventional signal light, and the optical axis of the signal light is External light H ₁ , H _{2 ,} etc. that enters the signal light obliquely is blocked or attenuated to prevent it from entering the signal light. Therefore, similar to conventional louvers, false appearance caused by extraneous light is prevented. The light shielding effect of the film 4 is determined by the dimensional ratio of W ₁ , W ₂ , and d, so W ₁ =0.3mm, _W2 =0.01mm, d=
It becomes 0.8mm. When the film 4 is used, the effect is equivalent to that of a conventional louver, which has a louver spacing of 3 cm, a louver plate thickness of 1 mm, and a louver depth of 8 cm. In addition, transparent silicone rubber etc. have a light transmittance of 100.
%, it is necessary to increase the number of light sources slightly to obtain the same luminous intensity as a general signal light, but on the other hand, due to the shading effect of external light, the luminous intensity of the lens surface decreases when the lights are turned off, and the blinking Contrast is improved. Therefore, there is no problem in use even if the light source is not particularly strengthened.

Further, if the transparent layer 5 in the film 4 is a colored transparent layer colored in the same color as the signal lamp color, it is possible to block light of colors other than the signal lamp color, so that the contrast of blinking can be further improved.

Furthermore, since the film 4 is so thin that it can be almost ignored compared to conventional louvers, it does not obstruct the field of view of the signal light, and the field of view in the lateral direction is much improved compared to the louver system.

FIG. 4 shows a second structural example of the film 4, in which the tomographic plane between the transparent layer 5 and the light-shielding thin film layer 6 is shown in the film 4.
It is formed at a constant inclination angle θ with respect to the thickness direction. The film 4 having such an inclination angle θ can be easily made by cutting diagonally along the chain line Q in FIG. 3, for example. When using the film 4 having this inclination angle θ, a sufficient light shielding effect can be obtained even against nearly horizontal external light.

FIG. 5 shows a third structural example of the film 4, in which a hard or soft transparent protective layer 9 is formed on the surface, and FIG. 5a shows the protective layer 9 on both sides, and FIG. This is an example of laminating. For example, polycarbonate or the like is used as the protective layer. Note that it is even better if the surface of the protective layer 9 is subjected to anti-reflection treatment such as coating.

FIG. 6 shows a second embodiment of the signal light of the present invention,
This invention is applied to pedestrian signal lights.
In this example, the film 4 is located inside the lens 3 and in front of a doll silhouette plate 10 for pedestrian signals.

Effects of the invention The present invention has the structure and function as explained above, and simply places a laminated film in which a transparent layer and a light-shielding thin film layer are adhered alternately at an appropriate position in front of a reflecting mirror. It can achieve the same effect of preventing false appearance as a conventional louver, and has the excellent effect of providing a signal light with a simple structure and low cost.

In addition, since the above-mentioned film does not take up much volume like a louver, it does not obstruct the field of view of the signal light, and in particular, the lateral field of view is significantly improved compared to signal lights that use conventional louvers.
This has an excellent effect of improving the visibility of the signal light.

[Brief explanation of the drawing]

Fig. 1 is a side sectional view showing the main parts of the first embodiment of the signal lamp of the invention, Fig. 2 is a partially enlarged perspective view showing a first structural example of the film used in the signal lamp of the invention, and Fig. 3. 4 is an enlarged sectional view showing a second structural example of the film used in the signal light of the present invention, and FIGS. 5 a and 5 b show a third structural example of the film used in the signal light of the present invention. 6 is a side sectional view showing the second embodiment of the signal light of the present invention, FIG. 7 is a side sectional view of a conventional signal light, and FIG.
The figure is a schematic front view of the same as above. 1...Light bulb, 2...Reflector, 3...Lens, 4
... false appearance prevention means (film), 5 ... transparent layer, 6 ... light-shielding thin film layer, 9 ... transparent protective layer, θ
...The inclination angle of the fault plane.

Claims (1)

[Claims for Utility Model Registration] A reflecting mirror 2 made of a paraboloid, a light bulb 1 for a light source,
In a signal light having a lens 3 and a false appearance prevention means 4, the false appearance prevention means 4 is made by cutting a laminated structure in which transparent layers and light-shielding thin films of a predetermined thickness are alternately adhered to each other into thin pieces in the thickness direction. The light source bulb 1 is placed at the focal point of the reflector 2, the lens 3 is placed in front of the bulb 1, and the false appearance prevention means 4 is placed in front of the reflector 2 on the light emitting surface of the signal light. A signal light characterized by being arranged so as to cover the.