F..theta. lens system

Details F..theta. lens system F..theta. lens system

1988-03-31

1989-09-05

Corbin, John K.

350415, 350464, G02B 1322, G02B 962, G02B 964

Patent

active

048632503

ABSTRACT:
An f..theta. lens system which incorporates the advantages of a telecentric optical system and which is also achromatized so as to permit its use with a multi-mode laser. The lens system includes, in order from the light source side, of a first lens unit composed of one or two lens elements and which has a negative refractive power with a concave surface directed toward the light source side, a second lens unit composed of a positive meniscus lens having a convex surface directed toward the image side, a third lens unit composed of two positive lens elements and one negative lens element and which has a positive refractive power, and a fourth lens unit composed of two plano-convex lens elements and which is spaced a long distance from the third lens unit so as to be located at a position close to the image plane.

REFERENCES:
patent: 4396254 (1983-08-01), Shibuya

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