Focus balance automatic adjusting device and automatic adjusting

Details Focus balance automatic adjusting device and automatic adjusting Focus balance automatic adjusting device and automatic adjusting

1995-12-19

1997-03-11

Tran, Thang V.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4432, 369 4435, 369 54, G11B 7095

Patent

active

056108869

ABSTRACT:
A focus balance automatic adjusting device includes an adder, an envelop detector circuit, a disturbance generator and signal processing section. The adder adds together signals obtained by converting signal currents detected by a four-divided detector into voltages by use of first and second current-voltage converters to create an RF signal. The an envelop detector circuit effects the peak detection and bottom detection for the RF signal and creates an RFRP signal which is a difference between the peak detection signal and the bottom detection signal. The disturbance generator generates disturbance signals for deviating the focus position in positive and negative directions. The signal processing section receives the RFRP signal and the disturbance signal to control the gain of the second current-voltage converter. The focus balance is automatically adjusted by introducing a disturbance signal output from the disturbance generator into a focus servo loop, de-focusing the focus position in two opposite directions by a preset amount, and setting levels of the RFRP signal having amplitude information obtained at this time equal to each other.

REFERENCES:
patent: 4707648 (1987-11-01), Minami
patent: 4862446 (1989-08-01), Maeda
patent: 5005163 (1991-04-01), Yamamoto et al.
patent: 5065386 (1991-11-01), Takeya et al.
patent: 5109367 (1992-04-01), Yoshikawa
patent: 5146443 (1992-09-01), Iwase et al.
patent: 5363357 (1994-11-01), Niwayama
Patent Abstracts of Japan, vol. 14, No. 341 (P-1081), Jul. 24, 1990, JP-A-2118923.

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