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:
May. 12, 1992
Filed:
Oct. 24, 1990
Applicant:
Inventor:
Masanori Idesawa, Wako, JP;
Assignee:
Rikagaku Kenkyusho, , JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01J / ; G01N / ;
U.S. Cl.
CPC ...
2502014 ; 2502017 ; 250561 ;
Abstract
Disclosed is a method of monitoring the state of focusing of an image on a semiconductor image position sensitive device of the type having a photosensitive layer, a resistance layer provided on the photosensitive layer and output terminals provided on the resistance layer. In this method, a bright spot image is moved across a border between a light-insensitive or non-sensitive zone and a light-sensitive zone. The rate of change in the level of an output signal obtained when the bright spot image is moved across the border is then detected. The degree of focusing of the bright spot image is then derived from the state of change in the level of the output signal.