Apparatus and method for measuring characteristics of optical pi

Details Apparatus and method for measuring characteristics of optical pi Apparatus and method for measuring characteristics of optical pi

1998-10-29

2000-02-15

Font, Frank G.

Optics: measuring and testing

Focal position of light source

G01J 100

Patent

active

060259078

ABSTRACT:
A device for measuring characteristic values of an optical pickup and/or an optical disc capable of detecting tracking signals for measuring characteristic values even if optical disc rotation is not subjected to eccentricity. The device for measuring characteristic values of an optical pickup and/or an optical disc 1 samples outputs of photodetectors of an optical pickup 2 as signals A to F directly by a sample-and-hold circuit 8 and an analog-to-digital converter 10 to store the resulting digital data in a second memory 11. An arithmetic-logic unit 12d measures tracking error signals based on the digital data stored in the second memory 11. A signal generating circuit 25 then sends a sine wave signal to a tracking coil 2b for moving the laser light illuminated on the optical disc along the radius of the disc.

REFERENCES:
patent: 4890273 (1989-12-01), Takeuchi et al.
patent: 5689482 (1997-11-01), Lida

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