Optical low-pass filter without using polarizers

Details Optical low-pass filter without using polarizers Optical low-pass filter without using polarizers

1990-02-20

1992-02-25

Miller, Stanley D.

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

359 94, 359 53, G02F 113

Patent

active

050917951

ABSTRACT:
An optical low-pass filter comprising a liquid crystal device or electrooptic device having a birefringent phenomenon and formed so as to be able to vary the birefringent amount of the incident light. This low-pass filter is favorably used to remove the Moire without so much reducing the resolving power in a television camera, electronic camera or fiberscope provided with a solid-state image sensor.

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John W. Evans, "The Birefringent Filter", Journal of the Optical Society of America, vol. 39, No. 3.
Berezin et al., "Liquid Crystal Deflector", Sov. J. Quant. Electron, vol. 4, No. 5 (Nov. 1974).
Ludeman, "Liquid Crystal Cell having Nonuniform thickness", IBM Technical Disclosure Bulletin, vol. 15, No. 4, Sep. 1972.

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