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. 31, 2017
Filed:
Apr. 29, 2017
Olympus Corporation, Hachioji-shi, Tokyo, JP;
Tsutomu Igarashi, Hachioji, JP;
OLYMPUS CORPORATION, Tokyo, JP;
Abstract
There is provided an endoscope objective optical system having a thin diameter, a wide in-water angle of view, a small variation in the angle of view, and a short overall length of the optical system. The endoscope objective optical system includes in order from an object side, a front group GF having a negative refractive power, an aperture stop, and a rear group GR having a positive refractive power, wherein the front group includes a first negative lens Land a second negative lens L, and the following conditional expressions (1), (2), (3'), and (4) are satisfied:1<<1.8  (1),4<<9.5  (2),1.49≦≦2.30  (3′), and0.38<Σ<0.6  (4).