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:
Oct. 23, 2001
Filed:
Mar. 17, 2000
Kazunori Ohno, Omiya, JP;
Fuji Photo Optical Co., Ltd., Saitama, JP;
Abstract
A two-focus switchable lens comprises a taking lens system selectively using a wide-angle-side lens and a telephoto-side lens having respective focal lengths different from each other; and a fixed shutter,, disposed on an image surface side of the taking lens system, for determining an amount of exposure. The wide-angle-side lens comprises two meniscus lenses L,, L,each having a concave surface directed onto the object side; whereas an aperture stop,for defining brightness is disposed between the lens L,and the fixed shutter,, with a single blade configuration, positioned on the image surface side of the lens L,. The telephoto-side lens comprises a single positive meniscus lens L,′ having a convex surface directed onto the object side, whereas an aperture stop,′ is disposed between the lens L,′ and the fixed shutter,, with a single blade configuration, positioned on the image surface side of the lens L,′. Also, a marginal luminous flux restricting mask,is disposed on the image surface side of the fixed shutter