Variable light distribution type headlamp

Details Variable light distribution type headlamp Variable light distribution type headlamp

1991-04-23

1992-08-11

Husar, Stephen F.

Illumination

Light source and modifier

Plural serial lens elements or components

362 61, 362277, 362319, F21V 1300

Patent

active

051385406

ABSTRACT:
A variable light distribution type headlamp which provides an optimum irradiated beam pattern under all driving conditions. The headlamp includes a projector lamp, a fixed lens, and a movable lens disposed on the optical axis of said projector lamp forward of said projector lamp. The movable lens is a condensing lens, and the fixed lens being a cylindrical concave lens. The focal length and a range of movement of the movable lens are such that front focal points of the movable and fixed lenses coincide when both lenses are close to each other. A lens drive mechanism controls the position of the movable lens in both X and Y directions so as to respectively control the amount of beam diffusion and beam direction in accordance with the vehicle speed and steering direction.

REFERENCES:
patent: 4345303 (1982-08-01), Gerard et al.
patent: 4739456 (1988-04-01), Little
patent: 4771372 (1988-09-01), Litetar et al.
patent: 5068768 (1991-11-01), Kobayashi

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