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:
Nov. 24, 1992
Filed:
Jun. 03, 1991
Yasuzi Ogata, Tokyo, JP;
Olympus Optical Co., Ltd., Tokyo, JP;
Abstract
A zoom lens system has (in order from the object side of the lens system) a first lens unit with a positive refractive power, a second lens unit with a positive refractive power, and a third lens unit with a negative refractive power. The second lens unit has (in order from the object side of the lens system) an aperture stop, a negative lens element, a positive lens element, and a cemented doublet. Airspaces are disposed between the first and second lens units, between the third lens element and the cemented doublet, and between the second and third lens units. The lens system performs a zoom operation when the lens units are moved toward the object side so that the airspace between the first and second lens units is widened while the airspace between the second and third lens units is narrowed.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile