Optical disk apparatus with a groove/pit area discrimination cir

Details Optical disk apparatus with a groove/pit area discrimination cir Optical disk apparatus with a groove/pit area discrimination cir

1996-07-05

1998-09-08

Tran, Thang V.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

309 4429, 309 4426, 309 58, G11B 709

Patent

active

058055428

ABSTRACT:
An optical disk apparatus for recording and reproducing data to and from an optical disk has a pit area where data are recorded along a track by pits and a groove area where grooves are formed along a track to record data. The optical disk apparatus includes an optical head for projecting a light beam on the optical disk and a photodetector array for receiving the reflected light. A preamplifier is connected to the photodetector array for producing a tracking error signal and an RF signal representing the pits. The tracking error signal is used as a clock signal in flip-flops and the RF signal is used as an initial setting signal, so that the flip-flop produces a signal indicating that the optical head is in the pit area.

REFERENCES:
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patent: 5335214 (1994-08-01), Natoba et al.
patent: 5363356 (1994-11-01), Tanaka
patent: 5452284 (1995-09-01), Miyagawa et al.
patent: 5508995 (1996-04-01), Moriya et al.
patent: 5615185 (1997-03-01), Horikiri
patent: 5638354 (1997-06-01), Nakayama et al.

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