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:
Aug. 05, 1997
Filed:
Jun. 12, 1995
Shigeyuki Uchiyama, Tokyo, JP;
Nikon Corporation, Tokyo, JP;
Abstract
A focus state detection device accurately detects in a short period of time the defocus amount of an arbitrary subject even when a plurality of subjects having different photographic distances are intermixed within the focus state detection region. Normally, the defocus amount is calculated on the basis of electric signal strings from each of a plurality of blocks. However, if one of the blocks is a perspective conflict block in which are intermixed a plurality of subjects having different photographic distances, new blocks are established containing at least part of the perspective conflict block. The defocus amount is calculated on the basis of the electric signal strings corresponding to these new blocks.