Tracking and focusing servo driven by comparison of direct curre

Details Tracking and focusing servo driven by comparison of direct curre Tracking and focusing servo driven by comparison of direct curre

1994-03-31

1996-07-16

Epps, Georgia Y.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 4437, 369122, G11B 7085

Patent

active

055373860

ABSTRACT:
There is provided an optical pickup adapted to read out signals recorded in an optical disk, which is capable of detecting tracking error signals and focusing error signals with good precision even when applied to the SCOOP method, and includes at least three light-emitting parts each capable of emitting laser beam, a detection part provided in association with each of the light-emitting parts for detecting a variation of an output in the light-emitting part associated therewith which is caused by the laser beam reflected by the optical disk, a tracking servo mechanism and a focusing servo mechanism, the servo mechanisms being adapted to be driven in response to signals respectively output by the detection parts for correcting a focusing point of the laser beam, wherein the detection parts each connected to a capacitor and an amplifier sequentially, at least two of the detection parts being each further connected to a rectifier after the amplifier to turn each of the signals respectively output by the detection parts into a direct current component signal, and wherein the tracking servo mechanism and/or the focusing servo mechanism is driven corresponding to a result of comparison between two of the direct current component signals output by the respective rectifiers.

REFERENCES:
patent: 5103439 (1992-04-01), Bierhoff et al.
patent: 5212675 (1993-05-01), Yoshino et al.
patent: 5351224 (1994-09-01), Nagata et al.
patent: 5383169 (1995-01-01), Shinoda et al.
patent: 5392304 (1995-02-01), Tanaka et al.

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