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. 27, 2012
Filed:
May. 03, 2011
Toyoki Kon, Hachioji, JP;
Toyoki Kon, Hachioji, JP;
Olympus Corporation, Tokyo, JP;
Abstract
An image forming optical system includes in order from an object side, a first lens group having a negative refractive power, a second lens group having a positive refractive power, which includes an aperture stop, a third lens group having a negative refractive power, and a fourth lens group having a positive refractive power. The first lens group, in order from the object side, includes a negative sub-group and a positive sub-group. The third lens group is a focusing group which includes only a cemented lens having a convex surface directed toward the object side, of a negative lens and a positive meniscus lens, in order from the object side.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile