Device for controlling the movement of a focal point of a light

Details Device for controlling the movement of a focal point of a light Device for controlling the movement of a focal point of a light

1986-10-06

1988-03-22

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

369 45, G01J 120

Patent

active

047330660

ABSTRACT:
A device for controlling the movement of a focal point of a light beam for detecting recorded information on a recording medium, comprises a focus actuator connected to a focal lens for focusing the light beam on the recording medium, a drive amplifier for generating a drive current of the focus actuator, a photo detector for generating a focus error signal, a starting signal generating means for generating a starting signal, and a switching means for selectively applying either the focus error signal or the starting signal to the drive amplifier. The circuit construction and the stability of the operating characteristic are simplified by using a ramp signal whose level increases with time, as the starting signal.

REFERENCES:
patent: 3952191 (1976-04-01), Tinet
patent: 4286147 (1981-08-01), Tsuboi et al.
patent: 4317991 (1982-03-01), Stauffer
patent: 4446546 (1984-05-01), Miller
patent: 4512003 (1985-04-01), Kimura et al.
patent: 4636625 (1987-01-01), Emoto et al.

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