Boots – shoes – and leggings
Patent
1989-06-07
1991-07-09
Lall, Parshotam S.
Boots, shoes, and leggings
364552, 356237, 250562, 250563, G01N 2132, G06F 1520
Patent
active
050311123
ABSTRACT:
A defect detection system detects defective portions such as scratches, pinholes and dust on a pattern formed surface of a medium such as an optical card, optical disk, holographic memory medium or photomask, on which fine patterns are formed. A light source irradiates a controlled ray to a recording portion as an object of detection of the medium, a position regulating mechanisn contrasts a light receiving position of the recording portion, a reflected ray detector distinctively detects reflected rays from defective portions and normal portions of the medium and a reflected ray controller contacts the reflected rays in a manner that the detector can detect optical data by imaging only the reflected ray from a defective portion without the reflected ray from a normal portion.
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patent: 4292672 (1981-09-01), Southgate
patent: 4505585 (1985-03-01), Yoshikawa et al.
patent: 4652125 (1987-03-01), Bowen et al.
patent: 4665317 (1987-03-01), Ferriere et al.
patent: 4665496 (1987-05-01), Ott
patent: 4707613 (1987-11-01), Nagata et al.
patent: 4900153 (1990-02-01), Weber et al.
Ota Yasushi
Sakai Yorihiko
Dai Nippon Insatsu Kabushiki Kaisha
Lall Parshotam S.
Mattson Brian M.
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