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. 02, 2014
Filed:
May. 13, 2013
Olympus Medical Systems Corp., Tokyo, JP;
Hideyasu Takato, Tokyo, JP;
Olympus Corporation, Tokyo, JP;
Abstract
Provided is an endoscope objective optical system that is constituted of, in order from the object side, a positive first group, an aperture stop, and a positive second group, wherein the first group is constituted of a negative first lens whose surface on the object side is flat and a positive second lens; the second group is constituted of a combined lens formed of a positive third lens and a negative fourth lens; and Conditional Expressions (1) to (3) are satisfied. F, F, and f are the focal lengths of the third lens, the fourth lens, and the entire system, respectively; and Rand Rare the radii of curvature at the object-side surface and the image-side surface of the second lens, respectively. 1.2<f/f<1.55 . . . (1), −2.8<f/f<−1.98 . . . (2), and 0.38<|R+R|/|R−R|<0.77 . . . (3).