Optical device which can generate tracking signal using split ph

Details Optical device which can generate tracking signal using split ph Optical device which can generate tracking signal using split ph

1997-04-09

1999-02-23

Edun, Muhammad N.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369112, G11B 712

Patent

active

058751599

ABSTRACT:
An optical device 10 including a photo-detector PD for converging light LF emitted from a light-emitting means LD on a recording medium and detecting returned light LR reflected from the recording medium and shield 2 disposed between the recording medium and the photo-detector means PD for shielding a part of returned light. The shield 2 includes edges in at least two directions and is disposed so as to shield the returned light LR by these edges. The photo-detector PD is split in the direction substantially perpendicular to the recording medium at its at least an axis T in which a signal is recorded. The optical device can generate a tracking signal by comparing signals detected by the split photo-detector PD.

REFERENCES:
patent: 5253236 (1993-10-01), Latta et al.
patent: 5341355 (1994-08-01), Gotoh et al.
patent: 5590110 (1996-12-01), Sato

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