Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1994-03-02
1996-05-07
Epps, Georgia Y.
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
369 13, 369 4414, 369109, G11B 700, G11B 1100
Patent
active
055153534
ABSTRACT:
An optical head comprising a light source for emitting a light beam, an objective lens for focusing the light beam onto an optical record medium as a fine spot and a photodetector for receiving the light beam reflected by the optical record medium to derive an information signal, tracking error signal and focusing error signal. A Wollaston prism is arranged on an optical path along which both forward and return light beams propagate, so that the return light beam is separated from the forward light beam. The Wollaston prism is formed by cementing two wedge shaped-crystal plates having different directions of optic axes. The light source and photodetector may be arranged on a same substrate, and thus the optical head can be made small in size and less expensive in cost and can have a high reliability.
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Matsubayashi Nobuhide
Miyazaki Yasuhiro
Cole Watson
Davis Stevens
Epps Georgia Y.
Mack Ricky
Olympus Optical Co,. Ltd.
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