Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1993-09-15
1995-06-27
Epps, Georgia Y.
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
369 4423, 369 4424, 369112, 369110, G11B 712
Patent
active
054285887
ABSTRACT:
The present invention relates to an optical head for recording, reproducing and erasing data on an optical data recording medium. The optical head has a fixed optical system having a laser optical source for emitting a light and a signal detecting optical system for detecting an error signal. A movable optical system having a beam splitter provided with a prism boundary face and having an objective at a position thereof opposing a surface of the optical data recording medium for receiving the emitted light through the beam splitter and focusing the received light onto the surface of the optical data recording medium as an optical spot. The beam splitter has, at the prism boundary face thereof, a polarizing film for transmitting one portion of the emitted light from the laser light source. The beam splitter has, at one side face thereof, reflective face for reflecting one portion of or all of the transmitted light through the polarizing film, and has, at another side face thereof, a light receiving element thereof for receiving the reflected light from the reflective face and one portion of said reflected light from the surface of the optical data recording medium.
REFERENCES:
patent: 5120136 (1992-06-01), Oakley
patent: 5200946 (1993-04-01), Fritz
patent: 5206852 (1993-04-01), Kim et al.
patent: 5235574 (1993-08-01), Aviles et al.
patent: 5272685 (1993-12-01), Ando
Edun Muhammad
Epps Georgia Y.
Ricoh & Company, Ltd.
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