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:
Dec. 14, 2021
Filed:
Feb. 25, 2019
Olympus Corporation, Hachioji, JP;
Takashi Kasahara, Tokyo, JP;
OLYMPUS CORPORATION, Tokyo, JP;
Abstract
A dry objective includes: first lens group that includes a plurality of meniscus lens components and has a positive power; a second lens group that includes a cemented lens, turns a pencil of diverging light from the first lens group into a pencil of converging light, and has a positive power; and a third lens group that includes a front group and a rear group and has a negative power, the front and rear groups having concave surfaces adjacent to and facing each other. The dry objective satisfies the following conditional expression:0.43≤()/≤0.9  (1) where gtindicates a thickness that a lens component of the rear group that is the closest to the object has on an optical axis; hgand hg, the heights of an axial marginal light ray at the lens surface of the lens component that is the closest to the object and an image.