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. 13, 1996
Filed:
Dec. 27, 1994
Keiji Ohsawa, Tokyo, JP;
Nikon Corporation, Tokyo, JP;
Abstract
A focus detection device includes a sensor for detecting focus in at least two regions of an image field. The device further includes a photographic lens for receiving light from a source in the image field, and a field lens for receiving light from the photographic lens. The field lens is disposed between the photographic lens and the sensor, and includes a plurality of field lens elements for receiving light from the regions of the image field. At least two of the field lens elements are adjacent field lens elements corresponding to adjacent regions of the image field. The adjacent field lens elements are separated by a space to deflect stray light. A method of use also is described.