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:
Jul. 14, 1998
Filed:
Mar. 02, 1995
Kenichi Shinbori, Yokohama, JP;
Yoshiro Udagawa, Miyashiro-machi, JP;
Hiroshi Saruwatari, Kawasaki, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
An image sensing apparatus has a cut-off characteristic which is changed by a mechanism for rotating a simple optical low-pass filter having a tightly sealed structure about the periphery of the photographic optical path. Light from a lens representing a subject is received and converted by an image sensing unit upon having its high-frequency components attenuated by a suitable cut-off characteristic, which is for obtaining a color natural image, of a stacked member including an optical low-pass filter or birefringence plates constructing an optical low-pass filter. In a case where a monochromatic image is obtained, some or all of the birefringence plates are rotated through a predetermined angle by changeover means such as a transmission member without sacrificing the seal about the periphery of the optical path, thereby changing over the cut-off characteristic of the optical low-pass filter to a cut-off characteristic suitable for obtaining a monochromatic image. The light from the subject is then received and converted by the image sensing unit.