The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 20, 1983
Filed:
Jul. 22, 1980
Koichi Karasaki, Hadano, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
In order to optically inspect wiring patterns on a printed wiring board, laterally travelling light rays are passed through a half reflecting mirror disposed above the printed wiring board so as to be directed downwardly, thereby illuminating a wiring surface of the printed wiring board with the light normal thereto and at the same time light is directed at a large incident angle to the wiring surface through, for example, optical glass fibers to illuminate the wiring surface, whereby a corner which is a part of the wall defining a plated through hole formed in the printed wiring board can be detected as an accurate optical image, thus ensuring a highly accurate inspection of the wiring patterns.