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. 16, 2012
Filed:
Nov. 15, 2007
Takayoshi Togino, Shibuya-ku, JP;
Takayoshi Togino, Shibuya-ku, JP;
Olympus Corporation, Toyko, JP;
Abstract
The invention provides a superwide-angle imaging or projecting optical system provided that, albeit being a wide-angle optical system having an angle of view exceeding 180°, is of small size and reduced F-number and fast, and has improved f-θ performance. The optical system consists only of transmitting surfaces, and has an angle of view of 180° or more. The optical system comprises a front group (G) comprising at least one meniscus lens (L) having a negative focal length, an aperture (S), and a rear group (G) comprising at least two lenses having a positive focal length. At least one transmitting surface in the front group is made up of an extended rotation free-form surface.