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:
May. 10, 1983
Filed:
May. 19, 1980
Hisashi Tokumaru, Osaka, JP;
Akiyoshi Nakamura, Sakai, JP;
Minolta Camera Co., Ltd., Sakai, JP;
Abstract
An inverted telephoto type wide angle lens system of an aperture ratio, 1/2.0 and a field angle, 84 degrees is provided. The lens system consists, from the object to the image side, of: a first component of a positive meniscus lens element convex to the object side; a second component of a negative meniscus lens element convex to the object side; a third component of a negative meniscus lens element convex to the object side; a fourth component of a biconvex lens element; an aperture stop; a fifth component of a positive meniscus lens element convex to the object side; a sixth component of a biconvex lens element; a seventh component of a biconcave lens element; an eighth component of a positive meniscus lens element convex to the image side; and a ninth component of overall positive refractive power including at least one lens element. The sixth component can be axially moved relative to the other components in association with the focusing for correcting the aberrations which would occur upon close focusing.