Device for scanning a light beam at a constant speed

Details Device for scanning a light beam at a constant speed Device for scanning a light beam at a constant speed

1978-05-03

1979-12-18

Henry, Jon W.

350230, G02B 2717, G02B 910

Patent

active

041791835

ABSTRACT:
A light beam scanning device provided with a light source section to emit a scanning beam, a deflector to deflect the light beam from the light source section at a constant angular speed in a predetermined direction, and a lens system to focus the scanning beam deflected by the deflector on a scanning surface, wherein the lens system consists of two single lenses which are mutually positioned at a finite distance, the single lens at the side of the deflector has a negative refractive power, the single lens at the side of the scanning surface has a positive refractive power, and the scanning beam moves at a constant speed on the surface to be scanned due to the lens system having the f-.theta. characteristics.

REFERENCES:
patent: 3668984 (1972-06-01), Rosin
patent: 3961838 (1976-06-01), Zanoni
patent: 3973833 (1976-10-01), Lawson
patent: 4108532 (1978-08-01), Minoura

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