JPH03124402U - - Google Patents

Description

[Brief explanation of drawings]

FIG. 1 is a schematic plan cross-sectional view showing a first embodiment of a lens drive device for a variable light distribution type automobile lamp according to the present invention, FIG. 2 is a schematic cross-sectional view of the same side, FIG. 3 is a schematic front view of the same, and FIG. The figure is a developed view of the rotating ring showing the helicoid hole, Figures 5a and b are explanatory diagrams showing the action of the control lens system, Figure 6 is an explanatory diagram showing the pattern of the irradiation light flux, and Figure 7 is an explanatory diagram showing the other FIG. 8 is an explanatory diagram showing a combination of control lens systems, FIG. 8 is a developed view of a rotary ring showing the configuration of another helicoid hole, FIG. 9 is a plan sectional view showing a second embodiment of the device of the present invention, and FIG. The figure is a schematic sectional view of the same side, FIG. 11 is a schematic front view of the same, FIG. 12 is a plan sectional view showing the third embodiment of the device of the present invention,
The figure is a schematic sectional view of the same side, FIG. 14 is a schematic front sectional view with the same part cut away, FIG. 15 is a plan sectional view showing the fourth embodiment of the device of the present invention, FIG.
FIG. 7 is a schematic front view with the same part cut away. 1...Projector lamp, 2,50...Casing, 4,40...Reflector, 5...Lighting bulb, 6...Collimator lens, 10...Control lens system, 11...Guide tube, 12...Fixed Lenses, 12a, 13a... Convex lens step, 12b
...Concave lens step, 13...Moving lens, 1
4... Sliding ring, 15... Pin shaft, 17... Guide hole, 18... Rotating ring, 19... Helicoid hole, 20... Guide roller, 21... Ring gear, 22... Drive gear, 23...DC motor, 2
6... Potentiometer, 30... Support rod, 31
... Frame, 51 ... Aiming support mechanism.

Claims (1)

[Claims for Utility Model Registration] A variable light distribution type automobile lamp that drives one of two cylindrical lenses of a control lens system provided on the front optical axis of a parallel light beam irradiation means to vary the diffusion range of the light beam. In this step, a sliding ring and a rotation ring are inserted into and out of a cylindrical guide tube provided on the front optical axis of the parallel light beam irradiation means, and the rotation ring and the sliding ring are inserted into and out of a cylindrical guide tube provided on the front optical axis of the parallel light beam irradiation means, and the rotation ring is connected to a guide hole extending in the optical axis direction formed in the guide tube. A helicoid hole is drilled into the cylindrical wall of the ring, and pin shafts protruding from a sliding ring are constructed by fixing a movable lens with cylindrical lens steps arranged in parallel in the width direction, allowing them to slide freely only in the direction of the hole. A fixed lens having cylindrical lens steps arranged in the same direction and at the same pitch as the movable lens is directly or indirectly fixed to the front end of the guide tube, and the rotary ring is appropriately connected to the movable lens through a rotation transmission mechanism. A lens drive for a variable light distribution type automobile lamp, characterized in that the ring is rotatably connected to a control drive means such as a DC motor, and the rotational displacement of the rotary ring is detected by a potentiometer. Device.