Test system for optical disks

Details Test system for optical disks Test system for optical disks

1987-09-28

1989-07-25

McGraw, Vincent P.

Optics: measuring and testing

Inspection of flaws or impurities

Having predetermined light transmission regions

250201, 369 46, 369 53, G01N 2188

Patent

active

048506958

ABSTRACT:
A test system for optical disks, comprising a spindle motor for clamping and rotating an optical disk at a constant speed; an encoder for generating a pulse output corresponding to the angle of rotation of the motor; a measuring head comprising focus and tracking servo mechanisms for causing the focal point of a laser beam irradiating the disk to follow the guide groove thereof, and a displacement detector for optically detecting the displacement of a focusing lens driven by the servo mechanisms; the measuring head being operative to generate an output signal proportional to the displacement of the focusing lens; a feed mechanism for moving the measuring head in the radial direction of the disk; a control circuit for controlling the operations of the motor, the servo mechanisms and the feed mechanism; an analog to digital converter for converting the output of the measuring head at a timing according to the pulse output of the encoder; and a computer for commanding the control circuit and for computing the output of the analog to digital converter to determine the shape of the disk, whereby displacement of the focusing lens is directly detected by the displacement detector.

REFERENCES:
patent: 4502134 (1985-02-01), Kondo et al.
patent: 4508450 (1985-04-01), Ohshima et al.

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