Device for recording and/or reproducing an optical record...

Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system

Reexamination Certificate

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Details

C369S044290, C369S044350

Reexamination Certificate

active

06901037

ABSTRACT:
A device for recording and/or reproducing an optical record carrier (1), comprises an optical system for projecting a first, a second and a third optical beam at a first (11), a second (12) and a third spot (13) at the record carrier (1). The device further comprises detection elements primary position signals (D5, C, D1) which is indicative for an amount of radiation reflected by the record carrier at said thoses spots (11). The device further comprises signal processing means (34.1, . . . 34.4; 35.1, . . . 35.4) for generating a plurality of secondary position signals (S1, S2, S3, S4) in response to the primary position signals (D5, C, D1). A selection element (36) selects one of the position signals (S1, S2, D1, S3, S4) as an output signal (WRE) in response to a selection signal (SEL). The selection signal (SEL) is derived from the output signal (WRE) of the selection element (36).

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patent: 6594210 (2003-07-01), Kumagai
patent: 6721242 (2004-04-01), Ohnishi et al.

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