Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1995-05-30
1997-05-13
Epps, Georgia Y.
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
369112, 369 4414, 369109, 369 4423, 369 4441, B11B 709
Patent
active
056299168
ABSTRACT:
An optical information reproducing device for reading informations recorded on the opto-magnetic recording medium is disclosed. The device comprises a first beam splitter for separating an inward path from an outward path of the light and a second beam splitter having a plane-parallel plate for separating the separated return light into two light fluxes including light flux with at least astigmatism, the first beam splitter having transmittivity and reflectance factor for the polarization component in the direction perpendicular to the linear polarization direction of the incident light being about 100%, the photodetector for receiving light flux with astigmatism separated from the second beam splitter being arranged in such a manner that the major axis of the ellipsoidal spot formed on the photodetector due to astigmatism becomes the push-pull signal direction.
REFERENCES:
patent: 5113386 (1992-05-01), Whitehead et al.
patent: 5483509 (1996-01-01), Yang et al.
patent: 5488598 (1996-01-01), Endo et al.
Chu Kim-Kwok
Epps Georgia Y.
Olympic Optical Co., Ltd.
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