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:
Nov. 26, 1991
Filed:
Apr. 27, 1990
Juro Kikuchi, Kitatsuru, JP;
Olympus Optical Co., Ltd., Tokyo, JP;
Abstract
An imaging optical system having a photographic lens and a mechanical stop is provided with a variable focal length lens disposed adjacent to a mechanical stop and having a diameter smaller than a maximum diameter of a beam of light capable of traversing the mechanical stop when opened. Further, the imaging optical system may be provided with a physical stop capable of changing transmittance in an electric field or a magnetic field and constructed so that a maximum diameter of a light-blocking portion is smaller than that of the beam of light capable of traversing the mechanical stop when opened. Consequently, adjustment of the amount of light in ordinary photography and macrophotography is properly made and a camera with low cost is secured.