JPH06101241B2 - head lamp - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a vehicle headlamp in which a bulb is arranged at the focal point of an elliptical reflecting surface, and a convex lens is arranged in front of the sub-focal point thereof. .

[Conventional technology]

In this type of headlamp, the lamp light reflected by the elliptical reflecting surface and passing through the sub focal point in the front is focused by a convex lens arranged in the front and then projected in parallel.

[Problems to be solved by the invention]

However, the lamp light that does not enter the elliptical reflecting surface or the convex lens from the bulb and enters the middle of these is wasted.

Therefore, the present invention, without increasing the outer diameter of the lamp,
It is an object of the invention to provide a headlamp of the kind mentioned at the beginning which is capable of converting such ineffective light into effective light.

[Means for solving problems]

In order to achieve this object, the present invention blocks the reflected light from the elliptical reflecting surface (3) between the tip portion (3c) of the elliptical reflecting surface (3) and the sub-focus (F '). An opening (13a) is formed in the center so as not to exist, and a spherical reflecting surface (13) centering on the focal point (F) is arranged.

The opening (13a) further has a periphery substantially coincident with an extension line (C) of a line connecting the focal point (F) and the valve mounting portion (2, 3b), and the reflected light from the elliptical reflection surface (3). It is preferable to arrange it as rearward as possible in a range that does not block the light.

[Action]

The lamp light reflected by the elliptical reflecting surface (3) passes through the sub-focus (F ') as usual and enters the convex lens (10). on the other hand,
Lamp light that is about to be wasted at a smaller irradiation angle than the tip (3c) of the elliptical reflecting surface (3) is reflected by the spherical reflecting surface (13) without being reflected by the elliptical reflecting surface (3). Is passed through the focal point (F), and then the elliptical reflecting surface (3)
It is reflected by and becomes effective light.

If the opening (13a) of the spherical reflecting surface (13) substantially coincides with the line (C) and is arranged as rearward as possible, unnecessary reflection does not occur on the valve mounting portion (2, 3b), and the ellipse is not formed. The lamp light that goes out of the circular reflection surface (3) is efficiently reflected to the focal point (F).

Example of Invention

1 and 2 show a headlamp according to an embodiment of the present invention.

In the figure, reference numeral 1 denotes a bulb arranged at the focal point F of the spheroidal reflecting surface 3, which is attached to the socket 3 in the hole 3b at the center thereof. Reference numeral 10 denotes a convex lens, which is fitted into the stopper 11 and is caulked into the hole 12a of the cylindrical lens holder 12. The rear end surface 12b of the lens holder 12 is provided with a spherical reflecting surface 13 having an opening 13a whose center is opened in a circular shape and having the focal point F as a center.

The elliptical reflecting surface 3 is fixed to a reflecting surface holder 8 having a pole 8b projecting forward. The rear end surface 12b of the lens holder 12 is screwed to the tips of these poles. In this state, the spherical reflecting surface 13 is located between the tip 3c of the elliptical reflecting surface 3 and the sub-focal point F ', and is an extension C of a line connecting the focus F and the periphery of the valve mounting hole 3b. The perimeter of the opening 13a substantially coincides with that of the elliptical reflecting surface 3
It is located as close as possible to the tip 3c within a range that does not block the reflected light from.

A rear wall of the housing 4 is screwed to a pole 8a attached to the elliptical reflecting surface 3 facing rearward, and an outer lens 5 is attached to a front end portion thereof.

The operation of the headlamp configured in this way is as follows.

The regular lamp light A reflected by the elliptical reflecting surface 3 passes through the sub focal point F ′, enters the convex lens 10, and is projected as a parallel light beam. Then, the lamp light in the range up to the lamp light B reflected by the tip 3c of the elliptical reflecting surface 3 having a smaller irradiation angle is projected from the convex lens 10 as similar effective light.

The lamp light having an irradiation angle between the projected light B and the line C is almost reflected by the spherical reflecting surface 13 toward the focal point F, further reflected by the elliptical reflecting surface 3 and passes through the sub-focal point F ′ as effective light.

By the way, even if the spherical reflecting surface 13 is formed closer to the center than the line C, it is reflected toward the socket 2 or its mounting hole 3b, so that effective reflection is not performed. Therefore, along the line C, the radius of the spherical reflecting surface 13 is gradually reduced so that the arrangement position thereof is brought closer to the tip portion 3c of the elliptical reflecting surface 3 as shown in the figure, so that the conventional useless lamp light is generated. More effectively converted to regular light.

The spherical reflecting surface 13 may be arranged in order of increasing radius and arranged in order toward the center so as not to block a plurality of effective light from the tip 3c of the elliptical reflecting surface 3 toward the front. It is possible to convert the lamp light that is going to be wasted over a wider irradiation angle range into effective light. When using headlamps for lower beams, first
As shown by the chain double-dashed line in the figure, the light shielding plate 18 is arranged.

〔The invention's effect〕

As described above, according to the present invention, by disposing the spherical reflecting surface inside without increasing the outer diameter of the lamp, it is possible to convert the conventional ineffective light into the effective light, thereby improving the lamp performance.

By arranging the opening of the spherical reflecting surface as close to the extension of the line connecting the focal point and the bulb mounting portion as possible, the lamp light outside the elliptical reflecting surface is converted into effective light as little as possible. .

[Brief description of drawings]

FIG. 1 is a schematic sectional view of a headlamp according to an embodiment of the present invention, and FIG. 2 is an exploded perspective view of the headlamp according to the embodiment. 1 ... Bulb, 3 ... Elliptical reflecting surface, 10 ... Convex lens,
13 …… Spherical reflecting surface, 13a …… Aperture.

Claims (2)

[Claims] 1. A valve is arranged at the focal point of an elliptical reflecting surface,
In a headlamp in which a convex lens is arranged in front of the sub-focal point, an opening is provided in the center between the tip of the elliptical reflecting surface and the sub-focus so as not to block the reflected light from the elliptical reflecting surface. Prepare,
In addition, the headlamp is characterized by arranging a spherical reflecting surface centered on the focal point. 2. The spherical reflecting surface is arranged as rearward as possible within a range in which the periphery of the opening substantially coincides with an extension of a line connecting the focal point and the valve mounting portion and does not block the reflected light from the elliptical reflecting surface. The headlamp according to claim 1, wherein: