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

G - Physics

11

B

234/19

G11B 7/09 (2006.01) G11B 7/085 (2006.01)

Patent

CA 1257235

ABSTRACT OF THE DISCLOSURE A focus system for controlling the position of the point of focus of a beam of light relative to an information surface on a recording medium. The system includes a focus error detector for generating a focus error signal indicative of the direction and distance between the point of focus and the information surfaces, a focus adjuster responsive to the focus error signal for altering the relative position of the point of focus of the beam along the path of the beam and towards the information surface and a gain control for continually controlling the gain of the focus error signal based on the optical character- istics of the portion of the recording medium being impinged by the beam.

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