Focus servomechanism control system of optical disc system havin

Details Focus servomechanism control system of optical disc system havin Focus servomechanism control system of optical disc system havin

1986-11-25

1987-11-17

Dobeck, Benjamin

Electricity: motive power systems

Positional servo systems

With particular 'error-detecting' means

369 45, 360 77, 318636, G05B 106

Patent

active

047076488

ABSTRACT:
A focus servomechanism control system in an optical disc is provided for controlling a light focusing unit to adjust a focus of light impinging on a track in a rotatable optical disc. The focus servomechanism control system includes: a unit for moving the light focusing unit in a direction perpendicular to a plane of the optical disc; a unit for producing a focus error signal; a unit for producing a track error signal; and a unit for controlling a position of the light focusing unit through the light focusing unit moving unit in response to the focus error signal and the offset parameter. The focus servomechanism control system further includes an offset setting unit for continuously setting, during an offset adjustment mode, a plurality of offset parameters to the position control unit, to determine a maximum amplitude of the track error signal, and to set the offset parameter producing the maximum amplitude of the track error signal to the position control unit. In a normal operation, the focus servomechanism control system effects varies the focus control in response to the set offset parameter and the focus error signal.

REFERENCES:
patent: 4346471 (1982-08-01), Hirasawa
patent: 4379256 (1983-04-01), Maury
patent: 4419701 (1983-12-01), Harrison et al.
patent: 4613916 (1986-09-01), Johnson
patent: 4633453 (1986-12-01), Ogawa

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