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:
Jul. 21, 2009
Filed:
Dec. 20, 2007
Tsutomu Uzawa, Hidaka, JP;
Yasushi Namii, Hachioji, JP;
Tsutomu Uzawa, Hidaka, JP;
Yasushi Namii, Hachioji, JP;
Olympus Medical Systems Corp., Tokyo, JP;
Abstract
A stereomicroscope has, in order form the object side, a single objective lens system; afocal relay optical systems, each including a front lens unit with positive refracting power and a rear lens unit with positive refracting power and having an intermediate image between the front lens unit and the rear lens unit; variable magnification optical systems; a plurality of aperture stops including at least aperture stops for right and left eyes, located at positions decentered from the optical axis of the objective lens system; and a plurality of imaging lens systems located at positions corresponding to the plurality of aperture stops. In this case, when each of the variable magnification optical systems lies at the low-magnification position, an entrance pupil of an optical system ranging from the objective lens system to each of the imaging lens systems is located closest to the objective lens system to satisfy the following condition:0<where L_enp_w is a distance from the most object-side surface of the objective lens system where a working distance is shortest to the entrance pupil at the low-magnification position and f_ob is the focal length of the objective lens system where the working distance is shortest.