Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1991-09-19
1993-12-21
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
369 4412, H01J 314
Patent
active
052723291
ABSTRACT:
An optical pickup using a holographic optical element includes a light source, a lens system for converting an optical beam outputted from the light source onto a recording carrier, a photodetector for detecting reflected light from the recording carrier and a diffraction grating for introducing the reflected light from the recording carrier to the photodetector in a light path connecting the recording carrier and the light receiving element. The photodetector includes a photodiode and a signal processing circuit which at least amplifies the output signal of the photodiode.
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Patent Abstracts of Japan, vol. 11, No. 208, Jul. 7, 1987.
Nagahama Toshiya
Seike Yasushi
Yamada Shigehiro
Yokogawa Naruichi
Yoshifusa Koji
Allen S. B.
Nelms David C.
Sharp Kabushiki Kaisha
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