Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1997-04-07
1998-08-25
Edun, Muhammad N.
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
369 4442, G11B 713
Patent
active
057989893
ABSTRACT:
An optical piece reproduces information from a spiral track of a disk. The pickup device includes the first to sixth photoelectric conversion devices. The first and fourth devices are disposed next to each other along the direction of the track of the disk; the second and third devices are disposed next to each other along the direction of the track. The first and second devices are disposed next to each other along the direction perpendicular to the track direction; the third and fourth devices are disposed next to each other along the direction perpendicular to the track direction. The fifth and sixth devices are disposed on both sides of the unit composed of the first to fourth devices along the track direction. The outputs of the first and third devices are added. The outputs of the second and fourth devices are added. The outputs of the fifth and sixth devices are subtracted from each other. The added and subtracted signals are outputted via output terminals.
REFERENCES:
patent: 4654838 (1987-03-01), Sugiki
patent: 4807211 (1989-02-01), Getreuer
patent: 5107102 (1992-04-01), Noda et al.
Edun Muhammad N.
Rohm & Co., Ltd.
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