1985-11-27
1988-09-13
Arnold, Bruce Y.
350 61, 350 68, G02B 904, G02B 2610
Patent
active
047705175
ABSTRACT:
This invention relates to an f.theta. lens for scanning a laser beam whose deflection half-angle reaches 30.degree.. If a deflection angle increases, the curvature of field and f.theta. characteristic are rapidly deteriorated. According to the present invention, the f.theta. lens is composed of two lenses. A first lens near a beam deflection point is formed by a meniscus lens substantially in the form of a concentric spherical surface. A power of the lens and a length between a common center of two refractive surfaces and a beam deflection point are suitably selected to well-correct the curvature of field and f.theta. characteristic over a wide scanning angle.
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How to Select Acousto-Optic Modulators, Barry Grossman, Harris Corporation, Government Communications System Division.
Arnold Bruce Y.
Ricoh & Company, Ltd.
Sugarman Scott J.
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