Optical head, method of manufacturing the same, and diffraction element suitable therefor
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United States of America Patent
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Oct 16, 2001
Grant Date -
N/A
app pub date -
Jul 22, 1998
filing date -
Jan 23, 1996
priority date (Note) -
Expired
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Abstract
As an optically anisotropic diffraction grating in an optical head for reading and/or writing of an optically recording medium, optically anisotropic diffraction grating which comprises an optically anisotropic polymer liquid crystal sandwiched between two transparent substrates are used. The optically anisotropic polymer liquid crystal can have an alignment direction periodically changed to form a grating of different refractive indices, obtaining a high-utilization efficiency by light ray and a high degree of reliability.
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