Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1992-12-15
1995-02-21
Dzierzynski, Paul M.
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
369 4423, G11B 700
Patent
active
053922743
ABSTRACT:
In an optical pickup device, signal light is reflected on an optical disk and is converged by a condenser lens. A polarizing plane of the signal light is rotated 45.degree. by a 1/2 wave plate. The signal light is then incident to a polarizing beam splitter at an incident angle .theta.. The polarizing beam splitter is constructed by a plane parallel plate having a polarizing coating film. An s-polarized component of light reflected on the polarizing beam splitter is received by first divisional light-receiving elements and a difference signal between outputs of the first divisional light-receiving elements is set to a tracking control signal. A p-polarized component of light transmitted through the polarizing beam splitter is received by second divisional light-receiving elements and a difference signal between outputs of the second divisional light-receiving elements is set to a focusing control signal. Sum signals of the first and second divisional light-receiving elements are respectively inputted to a reproducing signal detector. The reproducing signal detector obtains a reproducing signal of recorded information by calculating a difference between these sum signals.
REFERENCES:
patent: 4409631 (1983-10-01), Matsumoto
patent: 5004326 (1991-04-01), Sasaki
patent: 5189651 (1993-02-01), Utsumi
Dzierzynski Paul M.
Nguyen Kiet T.
Ricoh & Company, Ltd.
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