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1 January 1987 Optimization Design Of An Astigmatic Focusing System
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Proceedings Volume 0813, Optics and the Information Age; (1987)
Event: 14th Congress of the International Commission for Optics, 1987, Quebec, Canada
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
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Zhang Wei, Lu Da, Wu Minxian, and Chin Kou-Fan "Optimization Design Of An Astigmatic Focusing System", Proc. SPIE 0813, Optics and the Information Age, (1 January 1987);

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