F.theta lens system with variable focal length

Details F.theta lens system with variable focal length F.theta lens system with variable focal length

1988-12-12

1990-04-17

Sugarman, Scott J.

350 61, 350 68, 350426, 350427, G02B 1514, G02B 2610

Patent

active

049174835

ABSTRACT:
An f..theta. lens system used in a laser beam scanning device and being capable of varying a focal length thereof. The f..theta. lens system is provided between a deflector and a photosensitive medium and comprises from the deflector side a first lens unit of negative refractive power and a second lens unit of positive refractive power which are relatively moved to vary the focal length of the f..theta. lens system.

REFERENCES:
patent: 3750189 (1973-07-01), Fleischer
patent: 4123135 (1978-10-01), Rabedeau
patent: 4353617 (1982-10-01), Tokumitsu et al.
patent: 4390235 (1983-06-01), Minoura
patent: 4643516 (1987-02-01), Ogura
patent: 4786151 (1988-11-01), Hamada

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