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. 29, 2001
Filed:
Sep. 08, 1999
Masamitsu Ozawa, Kawasaki, JP;
Nikon Corporation, Tokyo, JP;
Abstract
A focal point detection apparatus having a plurality of detection areas comprises a view field mask disposed in the vicinity of a prearranged imaging plane of a photographing lens and provided with a plurality of view field apertures, a condenser lens provided with a plurality of lens units for respectively condensing light fluxes transmitting the plurality of view field apertures, and a re-imaging optical system provided with a plurality of re-imaging lens units for dividing a light flux transmitting each view field aperture into a pair of light fluxes transmitting different areas of the exit pupil of the photographing lens and for forming images of the respective view field apertures on light receiving means.