Optical device containing a liquid crystal element for changing optical characteristics of a lens element
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United States of America Patent
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Sep 29, 1998
Issued Date -
N/A
app pub date -
Oct 14, 1997
filing date -
Mar 31, 1993
priority date (Note) -
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Abstract
A liquid crystal active lens having, in combination, a fixed-focal-point lens having a high index of refraction and a phase modulation element comprising two-dimensionally arranged fine pixels, and having power and being capable of electrically controlling the lens characteristics as a function of space. An electrically controlled optical system can be realized without having a moving portion. Owing to the combination of the liquid crystal element for modulating space phase and the high-power lens of a fixed focal length, it is possible to electronically control the focal length and to electronically control the lens in a spatially split manner.
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