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. 26, 1993
Filed:
Sep. 04, 1992
Keiji Moriyama, Yokohama, JP;
Nikon Corporation, Tokyo, JP;
Abstract
A focusing detection apparatus has at least a focusing detection area on an optical axis of a photographing lens and a focusing detection area off the optical axis of the photographing lens in a photographing field and has a focusing detection optical system including at least a pair of apertures and a pair of refocusing lenses provided one set for each of the focusing detection areas. The focusing detection optical systems are arranged such that a positional relation between centers of the pair of aperture corresponding to the off-axis focusing detection area and optical axes of the pair of refocusing lenses is different from a positional relation between the centers of the pair of apertures corresponding to the on-axis focusing detection area and the optical axes of the pair of refocusing lenses.