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. 13, 2005
Filed:
Jun. 30, 2004
Hiroyuki Homma, Sagamihara, JP;
Hiroyuki Homma, Sagamihara, JP;
Olympus Corporation, Tokyo, JP;
Abstract
In a nearer order from its object, a first lens group which has a negative refractive power, a brightness diaphragm, and a second lens group which has a positive refractive power, and a moving lens group which moves on an optical axis, conditions such as 2≦D/f≦6, and −2≦D/f≦0.37 are satisfied under condition that D(mm) indicates an air-converged length from an end surface near an image in the first lens group to an end surface nearer to an object in the moving lens group, f(mm) indicates a focal length in an entire system in a wide angle end, D(mm) indicates a distance from the end surface near the object in the moving lens group to a front principal point. By doing this, it is possible to provide an objective optical system which can obtain a high magnification while securing a sufficient distance between the diaphragm which is disposed behind the optical axis direction converting element such as a prism to the moving lens group.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile