JPH03112808U - - Google Patents

Description

[Brief explanation of drawings]

FIG. 1 is a side sectional view showing a first embodiment of a lens drive mechanism of a variable light distribution type auxiliary headlamp according to the present invention;
Fig. 2 is a plan sectional view of the same, Fig. 3 is a right side view of Fig. 1, Fig. 4 is a left side view of the same, Fig. 5 is an exploded view of the main part showing the helicoid part, Fig. 6 is an exploded perspective view, FIG. 7 is a circuit diagram showing one embodiment of the drive control circuit of the device, FIG. 8 is a side sectional view showing another embodiment of the present invention, FIG. 9 is a plan sectional view thereof, and FIG. Fig. 8 is a right side view, Fig. 11 is a left side view of the same, Fig. 12 is a developed view of the main parts showing the helicoid section, Fig. 13 is an exploded perspective view, and Fig. 14 shows switching of light distribution patterns by the device of the present invention. FIG. 1...Projector lamp, 2...Reflector, 3
...Lighting bulb, 4...Collimator lens, 5...Frame, 7...Fixed sleeve, 8...Fixed lens, 9...
Moving lens, 10... Axial sliding sleeve, 11...
Guide pin, 13, 44...Rotating tube, 13a, 43
a... Helicoid guide hole, 13b... Gear, 20...
Motor, 21...Position detection switch, 22a, 22
b, 22c, 22d...Sliding brush, 23a, 23
b, 23c, 23d...insulator, 24...shade,
40...Fixed lens frame, 41...Slide shaft,
42... Annular member, 45... Front and rear sliding sleeve, 46
... Helicoid drive pin, 48... Position detection switch, 48a, 48b, 48c, 48d... Contact, 49
a, 49b, 49c, 49d...Sliding brush, 50
...Interlocking shade.

Claims (1)

[Claims for Utility Model Registration] (1) A fixed lens and a movable lens are arranged on the front optical axis of a parallel light beam irradiation means consisting of a projector lamp, etc., and the movable lens is moved in the optical axis direction to collect a light beam. In a variable light distribution type auxiliary headlamp that controls light diffusion, a lens drive mechanism of the variable light distribution type auxiliary headlamp,
A cylindrical rotating tube that is rotatably installed around the outer periphery of the moving lens and is driven forward and backward by a motor via an appropriate rotation transmission mechanism, and a helicoidal notch or slot in the rotating tube. a position detecting means formed with a circuit pattern corresponding to the helicoid and having an insulating part or a non-conductive part for defining a stop position; The longitudinally movable sleeve to which the movable lens is fixed includes a guide pin that projects directly from the movable lens, and a rotation-preventing sliding means that prevents rotation of the movable lens and is pivotally installed to be slidable in the optical axis direction. A lens drive mechanism for a variable light distribution type auxiliary headlight, characterized by the following configuration: (2) The anti-rotation means includes a cylindrical fixed sleeve provided between a cylindrical front-rear sliding sleeve that fixes the moving lens and the rotary cylinder fitted onto the front-rear sliding sleeve, and a cylindrical fixed sleeve that prevents the fixed sleeve from moving in the axial direction. The lens drive mechanism for a variable light distribution type auxiliary headlamp according to claim 1, characterized in that it has a structure in which a guide groove is provided. (3) The variable light distribution type auxiliary device according to claim 1, wherein the rotation prevention means has a structure in which two slide shafts fixed to separate members are slidably inserted into the movable lens. Headlight lens drive mechanism.