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:
Oct. 17, 1978
Filed:
May. 10, 1977
Applicant:
Inventors:
Assignees:
Hitachi Denshi Kabushiki Kaisha, BOTH OF, JP;
Kabushiki Kaisha Banzai, BOTH OF, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01J / ;
U.S. Cl.
CPC ...
356121 ; 358 96 ;
Abstract
A video signal produced by picking up the light image of light projected upon a screen is quantized by a plurality of voltage comparators grouped in pairs and applied with different reference voltage levels. One of the outputs of comparators of respective pairs is inverted in an orderly manner and then synthesized with the rest of the outputs to produce a dark and bright stripe signal which is displayed on a video display device to form a radially discrete annular pattern representative of equibrightness curves.