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Proceedings Paper

Optimization Design Of An Astigmatic Focusing System
Author(s): Zhang Wei; Lu Da; Wu Minxian; Chin Kou-Fan
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Paper Abstract

The astigmatic off-focus detection is one of the commonly used automatic focusing techniques. Generally, the astigmatism is introduced by means of cylindrical lens.Take the optical disc autofocusing system as an example0), the light spot on the detector, which normally is circular, will suffer elliptical deformation if the information plane of the disc changes its distance from the objective (see Fig.1). The amounts of light impinging on the four quadrants are no longer equal and a difference signal can be derived

Paper Details

Date Published: 1 January 1987
PDF: 2 pages
Proc. SPIE 0813, Optics and the Information Age, (1 January 1987); doi: 10.1117/12.967327
Show Author Affiliations
Zhang Wei, Teinghua University (China)
Lu Da, Teinghua University (China)
Wu Minxian, Teinghua University (China)
Chin Kou-Fan, Teinghua University (China)

Published in SPIE Proceedings Vol. 0813:
Optics and the Information Age
Henri H. Arsenault, Editor(s)

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