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:
Sep. 22, 2009
Filed:
Sep. 03, 2008
Yasuharu Yamada, Shibuya-ku, JP;
Teruhisa Mitsuo, Shibuya-ku, JP;
Yasuharu Yamada, Shibuya-ku, JP;
Teruhisa Mitsuo, Shibuya-ku, JP;
Olympus Imaging Corp., Tokyo, JP;
Abstract
The invention relates to a rear converter lens apparatus to obtain a lens system having a focal length longer than that of a master lens device by the mounting of the master lens device, and a taking system comprising the same. A converter lens portion consists of, in order from an object side that is the master lens device side, a first lens group of positive refracting power, a second lens group of positive refracting power and a third lens group of negative refracting power. Between the respective lens groups there is a spacing. The first and second lens groups are located such that of axial air spaces in the converter lens portion, an air space between the first lens group and the second lens group is largest. One each lens group comprises a positive lens element and a negative lens element.