JP2586085Y2 - Vehicle headlights - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle headlamp, and more particularly to an improvement of a vehicle headlamp having an optical axis adjusting mechanism.

[0002]

2. Description of the Related Art Conventionally, there has been known a vehicle headlamp having an optical axis adjusting mechanism as shown in FIGS. In the figure, 1 is a housing of a headlight, 2 is a housing cap, 3 is a front lens, 4 is a light source bulb, 5 is a reflector, 6 is a reflector support frame, and one end of the frame 6 has a pair of spheres. The joint 7 is fixed, and the pair of ball joints 7 are respectively supported by ball seats 8 provided on the housing 1 and serve as rotation fulcrums for optical axis adjustment.

The other end of the frame 6 is supported by an adjusting screw. That is, 9 is a screw cylinder fixed to the frame side, and 10 is a screw shaft screwed into the screw cylinder. The screw shaft 10 protrudes outside through the housing 1 and has a crown-shaped gear at the protruding shaft end. The operation shaft 13 is rotatably supported by a holding member 12 provided outside the housing 1, and the gear 1 fixed to the tip of the operation shaft
4 is meshed with the gear 11.

In the optical axis adjusting mechanism having the above-described structure, the operating shaft 13
By rotating (forward or reverse rotation) the gear 14,
The screw shaft 10 rotates via the screw 11, and the screw cylinder 9 meshed with the screw shaft 9 advances, and the frame 6 fixed to the screw cylinder 9 is integrated with the reflector 5, and the ball joint 7 and the ball seat The optical axis is adjusted by tilting up and down around the fulcrum 8.

[0005]

In the above configuration, since the fulcrum of the vertical optical axis adjustment is set at two ball joints, the left and right optical axes are set at two ball seats supporting the ball joint. However, since the contact surface between the ball joint and the ball seat is spherical, errors during molding are likely to occur, and there is a disadvantage that the optical axis is shifted left and right. Further, when the size between the fulcrums is shortened by downsizing the lamp, there is a problem that the left and right optical axes are largely shifted by a small error. In addition, since the fulcrum structure is formed at two ball joints, the assembly may not be possible unless the dimensions between the fulcrums are accurate.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to provide a vehicular headlamp in which all the disadvantages of the conventional optical axis adjusting mechanism described above are eliminated.

[0007]

SUMMARY OF THE INVENTION The present invention is directed to a vehicle headlamp having an operating mechanism for tilting a reflector while supporting a reflector to which a light source bulb is attached with respect to a housing at two fulcrums. Each of the fulcrums is constituted by a shaft member and a cylindrical seat for receiving the shaft member , and
The shaft member is composed of two opposing two
The cylindrical seat is provided on the non-opposing surface side of the leg plate, and the
The side of the tip of the leg plate is cylindrical
The gist is that it comes into contact with the end face of the seat .

[0008]

As described above, according to the structure in which the two fulcrums are constituted by the shaft member and the cylindrical seat for receiving the shaft member, the optical axis does not shift left and right even when the optical axis is adjusted. In addition, the optical axis adjustment is stable because the holding shape of the fulcrum is long. Also, since the dimensional accuracy of the parts is improved, it is easy to assemble.

[0009]

1 and 2 show an embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a headlight housing, and reference numeral 5 denotes a reflector. On the rear side of the reflector 5, two opposing leg plates 5a, 5a are provided integrally at a predetermined interval,
A shaft member 5b is protrudingly provided on the non-opposing surface side of each leg plate 5a so that the axes thereof coincide with each other. On the other hand, on the inner surface side of the housing 1, a cylindrical seat 1a capable of respectively receiving the pair of shaft members 5b is provided integrally, and when received, the side surfaces of the distal ends of the leg plates 5a, 5a are cylindrical. The dimensions between the cylindrical seats are set so as to abut against the end faces of the seats 1a, 1a, respectively. In the case where the reflector 5 is supported by a frame, the shaft member 5b is attached to the frame.
Is provided.

The reflector 5 is tilted up and down by a not-shown operating mechanism with a pivot made of the shaft member 5b and the cylindrical seat 1a as a fulcrum to adjust the optical axis.

As described above, according to the pivot fulcrum for tilting the reflector 5 constituted by the pair of shaft members 5b and the cylindrical seat 1a, the optical axis does not shift in the left-right direction.
In addition, even if vibration or impact is applied, there is no possibility that the optical axis shifts right and left.

[0012] In addition, according to the above configuration, the dimensional accuracy of the parts is improved, so that it is easy to assemble. In addition, since the holding shape of the fulcrum is long, the optical axis adjustment is stable. Furthermore, the cost can be reduced by integrating the fulcrum portion.

[0013]

According to the present invention, the pivot point for tilting the reflector is constituted by the shaft member and the cylindrical seat for receiving the shaft member. A stable optical axis adjustment mechanism that does not shift can be obtained.
In particular, the optical axis adjustment mechanism of the present invention has the following practical advantages.
Has an effect. (I) Since the shaft member is provided on the two leg plates,
To stabilize the movement of the
You. (Ii) The end side surface of the leg plate contacts the end surface of the cylindrical seat.
Due to the structure, the deviation of the reflector in the left and right direction is greatly
Decrease. (Iii) At the same time, it is used as a guide surface when moving up and down.
When adjusting up and down, a large contact area can be taken.
It is effective to prevent twisting of the left and right.

[Brief description of the drawings]

FIG. 1 is a sectional view of a reflector turning fulcrum in a vehicle headlamp according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view of a pivot point.

FIG. 3 is a front view of a conventional vehicle headlamp.

FIG. 4 is a central sectional view of FIG. 3;

FIG. 5 is a sectional view taken along line (XX) of FIG. 3;

FIG. 6 is a sectional view taken along line (YY) of FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Housing 1a Cylindrical seat 2 Cap 3 Front lens 4 Light source bulb 5 Reflector 5a Leg plate 5b Shaft member 6 Reflector support frame 7 Ball joint 8 Ball seat 9 Screw cylinder 10 Screw shaft 11 Crown gear 12 Bearing member 14 Gear

Claims (1)

(57) [Scope of request for utility model registration] 1. A vehicular headlamp having an operating mechanism for tiltably supporting a reflector having a light source bulb attached thereto at two housings with respect to a housing and tilting the reflector. The shaft member is provided on a non-opposing surface side of two opposing leg plates provided on the rear side of the reflector, and the cylindrical seat is provided on the housing. A headlight for a vehicle, wherein a side surface of a distal end portion of the leg plate comes into contact with an end surface of a tubular seat.