JP2558801Y2 - Projector type headlight - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a headlight for an automobile, and more specifically to a projector type, which projects a shape of a light beam blocked by a light shielding plate provided in a lamp. The present invention relates to a headlight having a light distribution characteristic.

[0002]

2. Description of the Related Art FIG. 4 shows an example of the configuration of a conventional headlamp 90 of this type of a projector type. For example, a halogen bulb is provided at one focal point of a reflecting mirror 91 formed as a spheroid or the like. A light source 92 such as a filament of
A light shielding plate 93 is provided so as to cover an unnecessary portion on the light distribution characteristic in the light flux converging toward the other one focal point, and a cross section of the light flux is formed to have a shape corresponding to the light distribution characteristic, and this shape is formed. Light distribution characteristics are obtained by enlarging and projecting in the irradiation direction with a projection lens 94. Usually, the light shielding plate 93 is provided so as to cover almost all light from the lower half of the reflecting mirror 91. Have been.

[0003]

However, in the above-mentioned conventional headlamp 90, almost all the light from the lower half of the reflecting mirror 91 is covered by the light shielding plate 93 as described above. As a result, approximately half of the light of the light source 92 reflected by the reflecting mirror 91 is blocked by the light-shielding plate 93, and half of the light emitted from the light source 92 is lost. A problem of the dark headlight 90 arises, and the solution of this problem has been an issue.

[0004]

According to the present invention, as a specific means for solving the above-mentioned conventional problems, there is no need for a light distribution characteristic between a reflecting mirror provided with a light source and a projection lens. In a projector type headlamp provided with a light-shielding plate for shielding a light beam of a portion, a surface of the light-shielding plate facing the reflection mirror includes a direct light from the light source and a reflection from the reflection mirror. A problem is solved by providing a projector-type headlamp provided with a reflecting surface for converging at least one of light near the light source and returning to an upper half of the reflecting mirror. Is what you do.

[0005]

Next, the present invention will be described in detail with reference to an embodiment shown in the drawings. In FIG. 1, reference numeral 1 denotes a projector-type headlamp (hereinafter, abbreviated as headlamp 1) according to the present invention. The headlamp 1 has, for example, a spheroidal surface and has one focus. A reflecting mirror 3 on which a light source 2 is disposed, a projection lens 4 which is an aspheric convex lens, and a light beam converged by the reflecting mirror 3 which are arranged between the reflecting mirror 3 and the projection lens 4. It is the same as the conventional example in that it is configured with a light shielding plate 5 that shields a portion that is unnecessary in light distribution characteristics such as a portion that becomes upward light. A reflection surface 6 is provided on a surface facing the reflection mirror 3 (hereinafter referred to as a back surface 5a), and the light shielded by the light shielding plate 5 is returned to the reflection mirror 3 again. I have.

Hereinafter, the reflection surface 6 will be described in more detail. First, when considering the light abutting on the back surface 5a side of the light-shielding plate 5, the back surface 5a side includes radiated light centered on the light source 2 that is emitted from the light source 2 and directly reaches the back surface 5a. After being emitted from the light source 2, the light is reflected by the reflecting mirror 3 and comes into contact with the convergent light directed to the other one of the focal points.
The reflection surface 6 is formed in consideration of one of the above-mentioned divergent light and convergent light, or both of the divergent light and convergent light.

Referring again to FIG. 1, the reflecting surface 6 shown in FIG. 1 is an example in which only the direct light from the light source 2 is captured, and the reflecting surface 6 is also shown in FIG. As shown, below the center line Z of the headlight 1 is formed a concave spherical surface having the light source 2 substantially at the center, whereby the reflection surface 6 directs the light from the light source 2 toward the vicinity of the light source 2 again. The light is returned as convergent light, and finally passes through the vicinity of the light source 2 and reaches the reflecting mirror 3.

At this time, since the reflecting surface 6 is provided below the center line Z of the headlight 1 as described above,
The reflected light from the reflecting surface 6 comes into contact with the upper half of the reflecting mirror 3 and is not blocked by the light shielding plate 5 after being reflected by the reflecting mirror 3 again. The light of the part which has been made ineffective by being in contact with the back surface 5 a of the light 5 is regenerated as irradiation light of the headlight 1.

In actual practice, the reflecting surface 6 does not need to be formed as a completely concave spherical surface, and the spot shape when reflected by the reflecting surface 6 and converged in the vicinity of the light source 2 is, for example, horizontal. By making it a wide oval shape,
The light distribution characteristics of the headlamp 1 can also be made wider in the horizontal direction, and more favorable light distribution characteristics for the headlamp 1 for an automobile can be obtained.

FIG. 3 shows another embodiment of the present invention. In contrast to the previous embodiment in which the reflecting surface 6 is formed for direct light from the light source 2, this embodiment is different from the embodiment shown in FIG. In this embodiment, a reflecting surface 7 provided on the back surface 5a side of the light-shielding plate 5 is provided with a direct light reflecting portion 71 having the same structure as that of the previous embodiment corresponding to the direct light from the light source 2 and the reflecting mirror. Utilizing the fact that the reflected light from 3 is converged and the spot diameter is relatively small at the position where the reflected light comes into contact with the light shielding plate 5, it corresponds to the reflected light from the reflecting mirror 3 of the direct light reflecting section 71. The reflection light reflecting portion 72 is formed in the portion where the light is reflected.

Here, the reflected light reflecting section 72 converts the reflected light from the reflecting mirror 3 into convergent light directed to the vicinity of the light source 2 similarly to the direct light reflecting section 71 described in the previous embodiment. However, since the reflected light from the reflecting mirror 3 already has the property of converging light, the reflected light reflecting portion 7
In accordance with the degree of convergence of the reflected light, for example, a convex mirror is used to reduce the degree of convergence.
Is generated in the vicinity of.

With the above configuration, in the headlight 1 of this embodiment, most of the direct light from the light source 2 is regenerated by the direct light reflecting portion 71, and in addition, the reflected light from the reflecting mirror 3 is regenerated. Almost all of the light is regenerated by the reflected light reflecting portion 72. With such a configuration, the headlight 1 further improves the utilization rate of light from the light source 2.

Although illustration is omitted, it is also possible to provide only the reflected light reflecting portion 72 on the reflecting surface 7, and in this case, almost all of the reflected light from the reflecting mirror 3 can be used. . In any case, the light reflected by the reflecting surfaces 6 and 7 is returned to the reflecting mirror 3 under almost the same conditions as the light from the light source 2, so that the light distribution characteristics of the headlamp 1 are extremely low. There is no change that causes deterioration.

[0014]

As described above, according to the present invention, at least one of the direct light from the light source and the reflected light from the reflector is provided on the surface of the light-shielding plate facing the reflector in the vicinity of the light source. In the projector type headlamp provided with a reflecting surface that converges and returns to the upper half of the reflecting mirror, light of a portion which has been conventionally blocked and disabled by a light shielding plate is reflected by the reflecting surface. In this way, the projector-type headlamp has a remarkably excellent effect in improving the performance of the projector-type headlamp.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of a projector type headlamp according to the present invention.

FIG. 2 is a perspective view showing a main part of the same embodiment.

FIG. 3 is a sectional view showing another embodiment of the projector type headlamp according to the present invention.

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

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Projector type headlamp 2 ... Light source 3 ... Reflecting mirror 4 ... Projection lens 5 ... Shielding plate 5a ... Back 6, 7 ... Reflecting surface 71 ... Direct light reflection part, 72 ... Reflection Light reflector

Claims (1)

(57) [Scope of request for utility model registration] 1. A projector-type headlamp comprising a light-shielding plate provided between a reflecting mirror provided with a light source and a projection lens for shielding a light beam of a portion unnecessary on light distribution characteristics. On the surface of the light-shielding plate facing the reflecting mirror, at least one of the direct light from the light source and the reflected light from the reflecting mirror is converged in the vicinity of the light source and the upper half of the reflecting mirror is A projector-type headlight having a reflection surface for returning.