Servo control gain adjustment for an optical disk apparatus

Details Servo control gain adjustment for an optical disk apparatus Servo control gain adjustment for an optical disk apparatus

1989-12-04

1991-06-25

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

2502221, 2502015, 369 4429, 369 54, H01J 4014, G11B 390

Patent

active

050269810

ABSTRACT:
An optical disk apparatus comprises a light emission detection circuit which converts a light emission from a light source into an electric signal and releases it as a light emission signal, a photo detector which releases an output signal upon reception of a reflected light from a disk and/or stray lights, a correction signal generating circut which adjusts a prescribed gain in accordance with the amount of stray light, and generates a correction signal by attenuating the light emission signal based on this gain, a subtracter in which the correction signal is subtracted from the output signal of the photo detector, and disk discharging means for discharging the disk from the optical disk apparatus, when the disk is present in the optical disk apparatus during the adjustment of the above-mentioned gain. The optical disk apparatus is arranged such that an optimum gain may be obtained even when the disk is present inside the optical disk apparatus, since the disk is discharged from the optical disk apparatus by the disk discharging means during the adjustment of the gain. Thereby an accurate tracking error signal and focus error signal may be otained by correcting the output signal of the photo detector.

REFERENCES:
patent: 4580255 (1986-04-01), Inoue et al.
patent: 4587644 (1986-05-01), Fujiie
patent: 4680744 (1987-07-01), Kanamaru
patent: 4701603 (1987-10-01), Dakin et al.
patent: 4723234 (1988-02-01), Katsuyama et al.
patent: 4878211 (1989-10-01), Suzuki et al.
patent: 4899327 (1990-02-01), Bates et al.
patent: 4942564 (1990-07-01), Hofer et al.

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