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:
Apr. 24, 2012
Filed:
Feb. 16, 2011
Tsutomu Uzawa, Shibuya-Ku, JP;
Hideyasu Takato, Shibuya-Ku, JP;
Tsutomu Uzawa, Shibuya-Ku, JP;
Hideyasu Takato, Shibuya-Ku, JP;
Olympus Medical Systems Corp., Tokyo, JP;
Abstract
The inventive objective lens for endoscopes has independently a zooming function and a focusing function, and is capable of magnified viewing. The objective lens has an angle of view (2ω) of 100° or greater, and comprises a positive first group G, a negative second group Gand a positive third group G. The third group Gcomprises a positive first (3-1) subgroup Gand a positive second (3-2) subgroup G. A subgroup in at least the second group Gmoves to (1) bring about a change in the focal length of the whole system and (2) correct an image position for movement in association with a focal length change, and one subgroup in the second group Gand the third group Gmoves to the image side from a longer side toward a shorter side of the working distance (WD) to (3) correct the focal position for movement in association with a working distance change.