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. 03, 1993
Filed:
Oct. 23, 1991
Masanori Yoshida, Tokyo, JP;
Ryuji Kawaguchi, Tokyo, JP;
Kiyotaka Kaneko, Tokyo, JP;
Katuo Asami, Tokyo, JP;
Masaaki Orimoto, Tokyo, JP;
Naoki Takatori, Tokyo, JP;
Fuji Photo Film Co., Ltd., Kanagawa, JP;
Abstract
An image pickup device which, in placing a phase type optical low pass filter in front of a taking lens, is able to cope with the varying focal distances of the taking lens only by a single piece of phase type optical low pass filter and which is also able to obtain a large quantity of information to be used for focusing detection in the auto focusing (AF) operation. The image pickup device is composed of a taking lens having a variable focal distance, a solid state image pickup element on which an object light image is formed through the taking lens, a phase type optical low pass filter which is disposed in front of the taking lens in a freely rotatable manner, and a device for rotating the phase type optical low pass filter according to the focal distances of the taking lens so as to be able to remove a given spatial frequency component corresponding to the pixel pitch of the solid state image pickup element. The image pickup device further includes a device which, when an AF detect circuit executes a focusing detection operation, rotates the optical low pass filter 90.degree. from a state in which the spatial frequency component in the horizontal direction can be removed, or retreats the optical low pass filter from a photograph optical system, and also which returns the optical low pass filter to its original state when photographing.