Optical storage inspection unit calibration disk

Details Optical storage inspection unit calibration disk Optical storage inspection unit calibration disk

1988-06-23

1991-01-29

McGraw, Vincent P.

Optics: measuring and testing

Standard

G01J 102

Patent

active

049881949

ABSTRACT:
A calibration disk used for an optical disk inspection unit to correct the measurement values of the mechanical characteristics, such as plane deflection and eccentricity of optical disks, and comprising at least one of three correction sections: an axial displacement correction section, a radial displacement correction section, and a focus error output voltage correction section which are formed on one or both sides of the calibration disk, concentric to the center of rotation of the disk so that measurement values, such as the surface deflection, can be corrected automatically and accurately by simply setting the calibration disk on an inspection unit.

REFERENCES:
patent: 4571714 (1986-02-01), Mathews et al.

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