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. 25, 1990
Filed:
May. 25, 1988
Masakazu Yamagata, Tokyo, JP;
Ryota Ogawa, Tokyo, JP;
Asahi Kogaku Kogyo Kabushiki Kaisha, Tokyo, JP;
Abstract
An endoscope objective lens system is disclosed in which the lens disposed just in front of a diaphragm stop in the lens system is a divergent lens having a concave surface on the image side and the convergent lens disposed immediately after the diaphragm stop is in the form of a convergent lens unit comprising, in order from the object side, a first optical element and a second optical element. The two optical elements are made of optical materials having different Abbe numbers (.nu. values) in such a way that the relation .nu..sub.2 <.nu..sub.3 is satisfied, where .nu..sub.2 is the Abbe number of the first optical element and .nu..sub.3 is the Abbe number of the second optical element.