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:
Sep. 09, 2003
Filed:
May. 31, 2001
Takayuki Sensui, Tokyo, JP;
Pentax Corporation, Tokyo, JP;
Abstract
A focus detection device is provided with a pupil dividing system, an intensity distribution pattern forming system, a plurality of light receiving elements arranged in a direction where the pupil is divided, a focus detection area defining system having an focus detection opening, the focus detection area defining system being arranged on or in the vicinity of a plane equivalent to a focal plane of the photographing lens, the light passing through the pair of focus detection areas passing through the focus detection opening, a deflection prism arranged between the focus detection opening and the pupil dividing system, and an optical element provided in the vicinity of the pupil dividing system, the optical element having an anamorphic refractive power. A refractive power in the pupil dividing direction is greater than a refractive power in a direction perpendicular to the pupil dividing direction.