Optical surface detection for magnetic disks

Details Optical surface detection for magnetic disks Optical surface detection for magnetic disks

1996-03-14

1997-08-26

Turner, Samuel A.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

356359, 356374, G01B 902

Patent

active

056615590

ABSTRACT:
An automatic surface inspection apparatus comprises a light source that provides a coherent light beam that is spit and then recombined in a prism to generate an interference pattern. A cylindrical lens projects the interference pattern onto the surface of a disk as a line of light. A linear detection array converts the reflected line of light into an electrical signal that has a magnitude which varies dependent upon the reflected light intensity. Defects present on the surface of the disk cause variations in the reflected light intensity manifested as differences in the electrical signal output by the detection array.

REFERENCES:
patent: 3218916 (1965-11-01), Saunders
patent: 4794550 (1988-12-01), Greivenkamp
patent: 4948251 (1990-08-01), Kondo

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