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. 11, 2009
Filed:
Jun. 06, 2005
Motoo Koyama, Tokyo, JP;
Motoo Koyama, Tokyo, JP;
Nikon Corporation, Tokyo, JP;
Abstract
A light detecting apparatus which can be arranged even in an optical path of which converting angle is relatively large, and can accurately detect light entering along a predetermined direction in an optical path. The light detecting apparatus () for detecting light which enters in a predetermined direction in an optical path has a light splitting element () having two optical surfaces () positioned in the optical path, and a photoelectric detector () for photo detecting light which propagates inside the light splitting element and which is guided from a side face () of the light splitting element. The light splitting element further has an incident angle conversion section () for converting a part of light which enters one optical face of the light splitting element into light entering the other optical surface at an incident angle greater than or equal to a total reflection angle.