Focus control system for optical information recorder or player

Details Focus control system for optical information recorder or player Focus control system for optical information recorder or player

1985-10-17

1987-10-20

LaRoche, Eugene R.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

250214AG, 369 45, H01J 4014

Patent

active

047016035

ABSTRACT:
A focus control system with a novel gain control circuit for continually varying the gain of the focus error signal based on the optical characteristics of the medium. As those optical characteristics change to decrease the amount of light available to the focus error detector, the gain of the focus error signal is increased so that the overall gain of the servo loop and the overall response of the servo to a focus error remains constant. This is accomplished by monitoring the optical characteristics of the medium which affect the focus error detector. In a multiple detector system, the outputs of all of the detectors are summed together. The resultant signal is a reflectivity or a transparency signal and is used in a novel circuit for controlling the servo gain.

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