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:
Jan. 07, 2014
Filed:
Nov. 02, 2009
Hisashi Goto, Tokyo-to, JP;
Akio Michinaka, Hachioji, JP;
Takahiro Amanai, Hachioji, JP;
Olympus Corporation, Tokyo, JP;
Abstract
An optical system comprises, in order from the object side, an aperture stop, a first lens with positive refracting power, a second lens with negative refracting power, and a third lens, both surfaces of the third lens are an aspherical surface in which refracting power varies in accordance with distance from the optical axis in such a way that the both surfaces have a convex shape facing toward the object side in the vicinity of the optical axis and have a concave shape facing toward the object side in the vicinity of the outer circumference, and the following conditions (1) and (2) are satisfied:2.2<<7  (1)−0.04<<0.04  (2)where dis the thickness of the first lens on the optical axis, dis a space distance between the first and second lenses on the optical axis, f is a focal length of the whole of the wide angle optical system, and fis a focal length of the third lens.