JPS587523Y2 - automotive headlights - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a headlamp for motorcycles, automobiles, etc., which is equipped with main and sub-filaments.

This type of headlamp is known to have various structures, and a typical one is shown in FIG.

The headlamp in this conventional example has a light bulb a inside, and the light bulb a has a curved surface defined by the center of curvature C at its rear end, and has a main filament d for a running beam and a main filament d for a passing beam inside the light bulb. and a secondary filament e, both of which are parallel to the axis X of the bulb and arranged one above the other in front of the center of curvature C.

This light bulb is attached to the parabolic reflector f that makes up the headlamp so that the direct light from the light source is not reflected upward, and at the same time, the upper part of the front side of the reflector is provided with the upward light from the light source. A light shielding plate g is provided to prevent direct light from being irradiated.

In such conventional headlamps, it goes without saying that the auxiliary filament e for passing each other is illuminated and an effective downward beam of light is emitted by the reflector f, but the light from the auxiliary filament is also emitted from the light bulb a. At the same time, harmful rays i that are reflected off the wall surface and directed upward are also generated.

This upward light ray i is irradiated through the lens and therefore dazzles oncoming vehicles, resulting in an undesirable phenomenon as a headlight.

The present invention was made to eliminate these drawbacks, and the purpose is to create a headlight that is configured so that even if there is reflection from the inner wall of the bulb installed inside, this does not turn into upward harmful light. This is what we are trying to provide.

The present invention, which was made to achieve this purpose, consists of the rear surface of the light bulb having a hemispherical surface or a curved surface close to this, and an oval shape as a whole, and the main filament and the sub-filament are arranged relative to the axis of the light bulb. Arranged vertically in parallel, the secondary filament is 0.3 to 0.3 to The main filament I is located at the focal point of the reflecting mirror, and is arranged so that the axis of the light bulb and the axis of the reflecting mirror are parallel to each other. This is a headlamp in which the internal bulb shape is oval, and the installation position of the sub-filament is specified within a certain space, and the light rays emitted from the sub-filament are transmitted through the wall of the bulb and reflected by a mirror. Except for the rays that reach the paraboloid of the reflector and become effective rays, the reflected light reflected from the inner wall surface does not follow the path to the paraboloid of the reflecting mirror, but is irradiated below the horizontal line, or the reflectance Since the light bulb faces the front of the small bulb, harmful light irradiation is eliminated, and since the axis of the bulb and the axis of the reflector are parallel, it is easy to set the bulb, and at the same time, the prism step of the lens can be reduced. This, combined with the anti-glare measures in the bulb itself, eliminates most of the upward scattered light, making it an excellent headlight.

Next, the present invention will be explained in more detail with reference to the illustrated embodiment. In FIG. 2, 1 is a light bulb, and the rear part 2 of the light bulb is a hemispherical curved surface centered on the center of curvature 3, or a curved surface close to this. Connecting to this curved surface, the body portion 4 is formed into a gentle curved surface toward the front, and is formed so as to have an approximately oval shape as a whole.

A main filament 5 serving as a running beam and a sub-filament 6 serving as a passing beam are arranged vertically in parallel with the axis X of the bulb as a boundary, and the sub-filament 6 is connected to the rear hemisphere 2 It is disposed at a position approximately 0.3 to 5 mm behind the center of curvature 3 within a space 7 defined by a line or plane passing through the center of curvature 3 and perpendicular to the axis X.

The reflector 8 of the headlamp to which this light bulb is attached has a predetermined paraboloid and has a focal point on the axis Y.

Note that 9 is a light shielding plate. In the headlamp of the present invention having the above configuration, the axis Y of the reflector 8 and the axis X of the light bulb 1 are arranged in parallel, and the main filament 5 is located at the focal point F of the reflector. , when the sub-filament 6 is turned on,
A downward effective light ray 10 is transmitted through the glass surface of the light bulb, that is, the wall surface, and reaches a reflecting mirror 8.

When the sub-filament 6 lights up, a reflected light 11 is generated that is reflected on the inner wall of the light bulb, but since the position of the sub-filament 6 is behind the center of curvature 3, this reflected light either becomes a downward ray or an upward ray. Even if it becomes a light ray, it reaches the light shielding plate 9, so no harmful light reaches the reflecting mirror 8, and therefore, there is almost no upward ray of dazzling light from the agent illumination lamp.

Furthermore, since the bulb itself is oval-shaped, most of the reflected light gathers on the front side of the bulb, where the reflectance is low, and is either blocked by a light-shielding plate or directed downward. Even if you do so, there will be no upward rays.

As explained above, the automobile headlamp according to the present invention is
The shape of the bulb housed inside is oval overall, and the mounting position of the sub-filament is in a limited space, so that the reflected light on the inner wall of the bulb is directed downward or is blocked by a light shielding plate, and The axis of the reflector is parallel to the axis of the bulb, and the main filament is at the focal point of the reflector, making it a good headlight that does not emit any harmful upward rays. It is easy to set the light bulb against the mirror, the prism step of the lens can be made small, and furthermore, the light bulb itself has excellent effects such as being able to prevent glare.

[Brief explanation of drawings]

FIG. 1 is an implicit side sectional view of a conventional headlamp, and FIG. 2 is an implicit side sectional view of a headlamp according to the present invention. 1... Light bulb, 2... Hemisphere, 3...
... Center of curvature, 4 ... Torso, 5 ...
Main filament, 6... Secondary filament, 7.
...Space part, 8...Reflector, 9...
... Light shielding plate, 10... Effective ray, 11...
...Reflected light, X...Light bulb axis, Y...
- Axis of the reflector.

Claims (1)

[Scope of utility model registration request] The rear surface of the light bulb is composed of a hemisphere or a curved surface close to this, and the entire shape is oval.The main filament and the sub-filament are arranged vertically parallel to the axis of the light bulb, and the center of the sub-filament is It is configured to be located approximately 0.3 to 5 mm behind the center of curvature within a space surrounded by a rear hemisphere and a plane passing through the center of curvature that defines this hemisphere and perpendicular to the axis, and A headlamp for an automobile, characterized in that a filament is located at a focal point of a reflecting mirror, and arranged so that the axis of the light bulb and the axis of the reflecting mirror are parallel to each other.