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:
Jun. 16, 1998
Filed:
Apr. 24, 1996
Shigeharu Nishikawa, Shiga, JP;
Kenichi Matsumura, Shiga, JP;
NEC Corporation, Tokyo, JP;
Abstract
The present invention provides an apparatus for inspecting a fluorescent screen, including a line light source for radiating light onto an external surface of a panel formed at an internal surface thereof with a fluorescent screen, a line sensor disposed facing to the internal surface of the panel for detecting light emitted from the line light source and transmitted through the fluorescent screen, a device for varying the relative positional relationship between the panel and a combination of the line light source and the line sensor in a direction perpendicular to a length-wise direction of the line sensor, and a processor for comparing linear patterns detected by the line sensor to a reference pattern. The apparatus automatically inspects an entire fluorescent screen, and further automatically makes judgement as to whether the fluorescent screen is good or bad in quality. In addition, the apparatus can eliminate Moire fringes which would have been generated by fluctuation in the level of transmitted light to thereby make no misjudgment.