JPH0650237U - Halogen light bulb with infrared reflection film and headlight using the light bulb as a light source - Google Patents

Abstract

(57) [Abstract] [Purpose] Conventionally, when a halogen light bulb with an infrared reflective film is used as a light source in a headlight for a low beam, and the amount of light is increased, the light distribution standard is defined by the reflected light from the outer leads. There was a problem that they could not be matched and could not be implemented. According to the present invention, the outer lead 12 is attached to a position above the glass tube 13 in a state in which the halogen bulb 10 with an infrared reflection film is attached to the headlight 1, and the halogen bulb 10 with an infrared reflection film is attached. Therefore, the reflected light from the outer lead 12, which is the largest factor that produces upward light, is converted from upward light to downward light and eliminated, and headlights using this kind of halogen bulb with an infrared reflection film 10 as a light source. The problem is explained by enabling the realization of the lamp 1.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a vehicle headlamp, and more specifically, it relates to a light source such as a halogen bulb with an infrared reflection film that is relatively prone to stray light, and a headlamp adopting this light source. It is related to.

[0002]

[Prior art]

 As an example of this type of light source, a halogen bulb 80 with an infrared reflection film will be described. In this halogen bulb 80 with an infrared reflection film, a glass tube 81 has an elliptical outer shape as shown in FIG. An infrared reflection film 82 is formed by applying a multi-layer coating to the infrared rays, and the infrared rays of the energy emitted from the filament 83 are returned to the filament 83 again to improve the efficiency. It is supposed to obtain 1.3 times the brightness.

[0003]

[Problems to be solved by the device]

 However, although the amount of light is increased by adopting the above configuration, the glass tube 81 is obliged to be a large double-ended type as shown in the drawing, and the outer lead 84 is also required. As a result, when the lamp 90 is formed in combination with the reflecting mirror 91 having a paraboloid of revolution as shown in FIG. 4, the spot shape becomes large due to the reflected light from the glass tube 81, and the so-called poor light distribution is obtained. A large amount of upward stray light is generated by the reflected light from the outer lead 84 described above, and a headlight for a low beam or a fog lamp for which the amount of upward light is strictly regulated is The configuration of the lamp 90 causes a problem that is completely impossible, and it has been a problem to solve this problem.

[0004]

[Means for Solving the Problems]

 As a concrete means for solving the above-mentioned conventional problems, the present invention is a halogen bulb with an infrared reflecting film, which has a double-ended glass tube and an outer lead for providing an infrared reflecting film. In the above, the outer lead is attached to a position above the glass tube in a state in which the halogen bulb with an infrared ray reflecting film is attached to the headlight. This solves the above-mentioned conventional problems.

[0005]

【Example】

 Next, the present invention will be described in detail based on the embodiment shown in the drawings. The reference numeral 1 in FIG. 1 is a headlight 1 for a passing beam that employs a halogen bulb 10 with an infrared reflecting film as a light source. The headlight 1 is upward stray light (hereinafter referred to as glare light). This is the same as the conventional example in that the reflecting mirror 2 of the headlight 1 adopts a rotating parabolic surface or a parabolic column surface.

Here, the results of the study by the inventor for making the present invention will be described. As shown in FIG. 1, each part of the halogen bulb with an infrared reflecting film 10 is attached to the reflecting mirror 2 having a paraboloid of revolution. As a result of tracing the locus of the emitted light, the spot projected in the vicinity of the intersection of the horizontal line H and the vertical line V by the light from the filament 11 shown in FIG. It was found that the light and the spot light projected in the vicinity of 7 ° above the horizontal line H due to the reflected light of the outer lead 12 similarly shown by the light distribution 12D are separated and projected in the irradiation direction.

At this time, the light distribution 11D from the filament 11 has a slightly fertile atmosphere (becomes a shape diffused in a wide range) as compared with the spot light from the filament of the conventionally used halogen bulb. Basically, there is no problem in forming the basic light distribution characteristics such as the irradiation direction and position, whereas the light distribution 12D generated from the outer lead 12 is clearly upward light and the passing beam. It was confirmed that it was extremely unacceptable when forming the light distribution for use.

This means that if the light distribution 12D generated by the reflected light of the outer lead 12 is eliminated, the possibility of realizing the headlight 1 using the halogen bulb 10 with the infrared reflection film as the light source increases. Therefore, according to the present invention, the outer lead 12 is arranged above the glass tube 13 in a state where the halogen bulb 10 with the infrared reflecting film is attached to the headlight 1.

Therefore, since the outer lead 12 is positioned above the filament 11, the spot light generated by the reflecting mirror 2 is generated as shown in FIG. The light distribution 12D and the horizontal line H shown in FIG. 2 are generated at the target positions, that is, the light is directed downward and does not cause any obstacle when forming the light distribution characteristic for the low beam.

Incidentally, in the case where the light distribution 11D from the filament 11 is slightly enlarged due to the light reflected by the glass tube 13 of the halogen bulb 10 with the infrared reflecting film, for example, a paraboloid forming the reflecting mirror 2 is used. It has also been confirmed that well-known means such as extending the focal length of the surface and reducing the enlargement ratio of the projected light distribution 11D can suffice. In the above embodiment, the reflecting mirror 2 is described as being formed of a paraboloid of revolution, but this is exactly the same for a parabolic column surface, and therefore the present invention is an anti-parabolic surface. It can be implemented in a mirror as well.

[0011]

[Effect of device]

 As described above, according to the present invention, the outer lead is attached to the headlamp of the halogen bulb with an infrared reflection film, and the halogen bulb with an infrared reflection film is attached to a position above the glass tube. As a result, the reflected light from the outer leads, which is a larger factor that generates upward light, is converted from upward light to downward light and eliminated. It is possible to achieve it in a state where it meets the standard, and thus it has an extremely excellent effect on performance improvement such as improving the visibility of this type of headlight.

[Brief description of drawings]

1 is a perspective view showing an embodiment of a halogen bulb with an infrared reflecting film and a headlamp using the bulb as a light source according to the present invention.

FIG. 2 is an explanatory diagram illustrating a state of radiated light generated when a halogen light bulb with an infrared reflecting film is attached to a reflecting mirror.

FIG. 3 is a side view showing the configuration of a halogen light bulb with an infrared reflection film.

FIG. 4 is a perspective view showing a conventional example.

[Explanation of symbols]

 1 ... Headlight 2 ... Reflector 10 ... Halogen bulb with infrared reflective film 11 ... Filament 12 ... Outer lead 13 ... Glass tube 11D, 12D ... Light distribution

Claims (2)

[Scope of utility model registration request] 1. A halogen bulb with an infrared reflection film, wherein a glass tube is a double-ended type and an outer lead is provided to provide an infrared reflection film, wherein the outer lead is a headlight of the halogen bulb with the infrared reflection film. A halogen light bulb with an infrared reflection film, which is mounted at a position above the glass tube when mounted on a lamp. 2. A headlamp comprising the halogen light bulb with the infrared reflection film as a light source.