JPH01206502A - Headlamp - Google Patents

Abstract

PURPOSE:To convert the ineffective light into the effective light without increasing the outer diameter of a lamp by providing an opening section at the center between the tip section of an elliptic reflecting face and an auxiliary focal point not to shield the reflected light from the above reflecting face and arranging a spherical reflecting face centering a focal point at the preset position. CONSTITUTION:The normal light A reflected by an elliptic reflecting face 3 passes an auxiliary focal point F' and enters a convex lens 10 and is projected as parallel rays. The light within the range to the light B reflected by the tip 3c of the elliptic reflecting face 3 having a smaller radiation angle is projected from the convex lens 10 as the effective light likewise. The light with the radiation angle between this light B and a line (c) is almost reflected by a spherical reflecting face 13 toward a focal point F and further reflected by the elliptic reflecting face 3 and passes the auxiliary focal point F' as the effective light. The radius of the spherical reflecting face 13 is gradually decreased along the line (c), its arranged position is neared to the tip section 3c of the elliptic reflecting face 3, thereby the wasteful light in the past is effectively converted into the normal light.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to an automobile headlamp in which a bulb is disposed at the focal point of an elliptical reflective surface and a convex lens is disposed in front of the sub-focal point. .

(Prior art) This type of headlamp is designed so that the light reflected by an elliptical reflective surface and passed through a sub-focal point in front is further focused by a convex lens placed in front, and then projected in parallel. It has become.

(Problems to be Solved by the Invention) However, the lamp light that does not enter the elliptical reflective surface or the convex lens from the bulb but enters an intermediate portion thereof is wasted.

Therefore, the present invention does not require increasing the outer diameter of the lamp.
It is an object of the present invention to provide a headlamp of the type mentioned at the beginning, which is capable of converting such ineffective lamp light into useful light.

(Means for solving the problem) In order to achieve this object, the present invention provides an elliptical reflective surface (
An opening (13a) is formed in the center between the tip (3C) and the sub-focal point (Fo) of 3) so as not to block the reflected light from the elliptical reflective surface (3), and the focal point (3) is A spherical reflecting surface (13) is arranged around F).

The aperture (13a) is further focused on the focal point (F) and the Harutsian area. 3 (2, 3b), and Qf should be placed as far back as possible so that it almost coincides with the extension line (C) of the line connecting 3 (2, 3b) and does not block the reflected light from the elliptical reflective surface (3). Delicious.

(Operation) The lamp light reflected by the elliptical reflecting surface (3) is 5 as usual; 1i
b - On the other hand, the lamp light that would be wasted at a smaller irradiation angle than the tip (3c) of the elliptical reflective surface (3) is not reflected by the elliptical reflective surface (3), and instead reaches the spherical reflective surface. (
13), the light passes through the focal point (g), and is further reflected by the elliptical reflecting surface (3) to become effective light.

The spherical reflective surface (13) is formed between its opening (13a) and the line (C
) and is placed as far back as possible,
The HARTZ mounting efficiently reflects the lamp light that deviates from the elliptical reflecting surface (3) to (j, 1.3 points (I)) without unnecessary reflection to parts (2, 3b).

(Embodiment of the invention) Fig. f:tS1 and Fig. 2 show a lamp to a spatula 1 according to an embodiment of the invention.

In the same figure, ■ indicates a hole 3b located at the focal point F of the spheroidal reflecting surface 3, and the hole 3b in the center of the socket 2.
installed on. 10 is a convex lens, and 1 is fitted into a fitting 11 to form a hole 12 in a cylindrical lens holder 12.
It is crimped into a. Rear end surface of lens holder 12 +
2b is formed with a spherical reflective surface 13 having a circular opening I3a in the center and having the focal point F as the center.

The elliptical reflective surface 3 is fixed to a reflective surface holder 8 with a ball 8b projecting forward. The rear end surface +2b of the lens holder I2 is screwed onto the tips of these balls. In this state, the spherical reflective surface 13 is located between the tip 3c of the elliptical reflective surface 3 and the sub-focal point F°, and the focal point F and the HARTZ mounting are located on an extension line of the line connecting the periphery of the use hole 3b. The opening 1J is located at the tip 3c in a range that almost coincides with the periphery of the first portion 13a and does not block the reflected light from the elliptical reflecting surface 3.

A ball 8a, which is cut out toward the rear of the elliptical reflective surface 3, is fixed to the rear wall of the housing sink 4, and an outer lens 5 is attached to the tip of the ball 8a.

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

The normal lamp light A reflected by the elliptical reflecting surface 3 is 1 focal point '+
'j Fo, 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, which has a smaller irradiation angle, is projected from the convex lens 10 as similar effective light.

This light B and! The lamp light with the irradiation angle between Jac is mostly reflected toward the focal point F by the spherical reflecting surface I3, and further reflected by the elliptical reflecting surface 3, and is reflected as effective light at the secondary point F, 1.1 point F.
Pass through ゛.

By the way, even if the spherical reflective surface 13 is formed closer to the center than the line C, the socket 2 or its receptacle 4 = j hole 3
Since it is reflected towards b, no effective reflection takes place.

Therefore, along this line C, the diameter of the L-shaped reflection surface 13 is gradually reduced to By doing so, the conventional wasted lamp light is converted into regular lamp light in a more efficient manner.

In some cases, a plurality of spherical reflecting surfaces 13 may be arranged such that the radius increases in order and the radius of the spherical reflecting surface 13 increases in order so as not to block the effective light toward the front from the tip 3c of the elliptical reflecting surface 3. It is possible to convert wasted lamp light into effective light over a wider irradiation angle range.

When the spatula 1-lamp is used for the lower beam, the light shielding plate 18 is arranged as shown by the two-dot chain line in FIG.

(Effects of the Invention) As described above, according to the present invention, by arranging a spherical projection surface inside the lamp without enlarging the outer diameter of the lamp, conventional invalid light can be converted into effective light, and the lamp performance can be improved. Direction-1-.

By placing the open part of the spherical reflective surface, the focal point, and the HARTS mounting in line with the extension of the line connecting the parts, the lamp light that deviates from the elliptical reflective surface is wasted as much as possible. converts it into effective light.

[Brief explanation of the drawing]

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 same embodiment. 1: Harz, 3: Elliptical reflective surface, 10: Convex lens, 13: Spherical reflective surface, 1: la: Opening.

Claims (1)

[Claims] 1) In a 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 its sub-focal point, between the tip of the elliptical reflecting surface and the sub-focal point: , with an opening in the center so as not to block the reflected light from the elliptical reflective surface,
A headlamp characterized by having a spherical reflective surface arranged at a focal point. 2) The spherical reflective surface must be located as far back as possible so that the periphery of its opening approximately matches the extension of the line connecting the focal point and the bulb mounting part, and does not block the reflected light from the elliptical reflective surface. The headlamp according to claim 1, characterized in that: