Focus adjustment system for optical disk apparatus

Details Focus adjustment system for optical disk apparatus Focus adjustment system for optical disk apparatus

1990-08-02

1992-08-25

Richardon, Robert L.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4425, 2502015, G11B 700

Patent

active

051425173

ABSTRACT:
A focus adjustment system for an optical disk apparatus has a monitor detector that detects the power of a light beam emitted from a laser, and a peak detector produces a peak-detect signal when peak beam power is detected. An optical system directs the light beam through an objective lens onto a disk, and feed light reflected from the disk back to the laser. A focus-error detector receives light reflected from the disk and produces a focus-error signal representing distance between the objective lens and the disk. A sample-and-hold circuit samples the focus-error signal when a peak-detect signal is produced, and outputs the sampled focus-error signal as a reference signal. A focus controller moves the objective lens toward or away from the disk according to the difference between the focus-error signal and the reference signal.

REFERENCES:
patent: 4503324 (1985-03-01), Yokota
patent: 4786794 (1988-11-01), Doi
"Three-Dimensional Control of the Light Beam Spot Position for Reproduction of Information"; Hajme Nishikawa; Nikkei Mechanical; Apr. 25, 1983; pp. 126-130.

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