Surface defect test method and surface defect tester

Optics: measuring and testing – Standard – Surface standard

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

3562372, G01N 2188

Patent

active

058984917

ABSTRACT:
The surface defect test method and tester according to the invention comprises a sensitivity calibration disk formed with n (n is an integer equal to or larger than 2) false defect rows each including 3 or more false defects each formed in a radial or peripheral direction provided in the peripheral direction of the calibration disk at a predetermined angle pitch. The false defects of each false defect row take in the form of protrusions or recesses having substantially the same size, adjacent ones of the false defects are physically separated by a predetermined distance larger than a width of a laser spot and the false defects of a certain one of the false defect rows are different in size from the false defects of other false defect rows, regulating the detection sensitivity according to a result of the test, producing, from a result of a test of the calibration disk with the regulated detection sensitivity, data relating a level of a detection signal to a size of the false defect as a reference data for determination of the size and obtaining the size of the defect from the level of the detection signal when the disk to be tested on defect on the basis of the reference data for determination of the size.

REFERENCES:
patent: 4636073 (1987-01-01), Williams
patent: 5004340 (1991-04-01), Tullis et al.
patent: 5214486 (1993-05-01), DeWitt
patent: 5258974 (1993-11-01), Ishimura et al.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Surface defect test method and surface defect tester does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Surface defect test method and surface defect tester, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Surface defect test method and surface defect tester will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-688783

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.