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:
Jan. 26, 2010
Filed:
Jun. 22, 2007
Masachika Watanabe, Tokyo, JP;
Yasuyuki Oyagi, Tokyo, JP;
Norihisa Moriya, Tokyo, JP;
Toru Iwane, Yokohama, JP;
Masachika Watanabe, Tokyo, JP;
Yasuyuki Oyagi, Tokyo, JP;
Norihisa Moriya, Tokyo, JP;
Toru Iwane, Yokohama, JP;
Dai Nippon Printing Co., Ltd., Tokyo, JP;
Nikon Corporation, Tokyo, JP;
Abstract
Optical system for guiding subject light incident through a photo-taking lenstoward a finderthrough a prismis prepared and a plate-like diffractive elementis provided on the optical path. Light from an LEDto be turned on when a focusing state is achieved is introduced into the plate-like diffractive elementvia a light guide member, and 'auxiliary light indicating a focusing state' to travel upward in the drawing from the plate-like diffractive elementis generated and synthesized with the subject light. The auxiliary light shall have a linear polarization property. The subject image and the focusing state indication can be visually recognized on the finder. Part of the light toward the finderis branched through a mirrorand then guided toward photometric unit. Auxiliary light separating unitfor excluding auxiliary light based on the difference in polarization property is provided in front of the photometric unit