Disk surface inspection method and apparatus therefor

Details Disk surface inspection method and apparatus therefor Disk surface inspection method and apparatus therefor

1989-06-13

1990-09-04

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250563, 356237, 356446, G01N 2189

Patent

active

049547232

ABSTRACT:
A method and apparatus for scanning a surface of an optical disk which has signal recording pits or bumps covered with a transparent layer, with a flying spot to detect surface defects of the optical disk surface. The optical disk is rotated at a constant speed of rotation and scanned along a scanning line parallel to but spaced at least 10 mm from a line radial to the center of rotation of the optical disk. A light-detecting unit receives diffused light reflected by the disk surface to provide an output corresponding to the intensity of the diffused light and converts it into an electric output which is used to evaluate the surface of the optical disk.

REFERENCES:
patent: 4464050 (1984-08-01), Kato et al.
patent: 4598997 (1986-07-01), Steigmeier et al.
patent: 4794264 (1988-12-01), Quackenbos et al.

Affiliated with

Also associated with

Rating

Disk surface inspection method and apparatus therefor does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Disk surface inspection method and apparatus therefor, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Disk surface inspection method and apparatus therefor will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-444053