Multi-element prism for optical heads

Details Multi-element prism for optical heads Multi-element prism for optical heads

1996-10-31

1998-08-11

Tran, Thang V.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369112, 369 4441, G11B 7085

Patent

active

057937192

ABSTRACT:
An apparatus for providing focus and tracking error signals for controlling an application of a radiation beam to a data track of an optical storage medium is disclosed. The present invention describes a multi-element optical prism used in the optical head, which permits for a single return path, a reduced cross talk between focus and tracking error signals, and a reduced track offset.

REFERENCES:
patent: 4712205 (1987-12-01), Smid et al.
patent: 5406541 (1995-04-01), Kay
patent: 5491675 (1996-02-01), Kay
patent: 5623462 (1997-04-01), Tezuka et al.
M.R. Latta et al., "Effect of Track Crossing on Focus Servo Signals: Feedthrough," SPIE Proceedings, vol. 1663, Optical Data Storage, 1992.
R. Katayama et al., "Multi-beam magneto-optical disk drive for parallel read/write operation," SPIE Proceedings, vol. 1078, Optical Data Storage Topical Meeting, Jan. 17-19, 1989.
pp. 172-179 of A. Marchant, "Optical Recording: A Technical Overview," Addison-Wesley, Reading, Mass.

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