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:
Aug. 21, 2001
Filed:
Sep. 17, 1999
Rong-Seng Chang, Taipei, TW;
Other;
Abstract
A zoom lens set with a fixed distance between lenses comprises at least one gradually changed curvature lens. The surface with a gradually changed curvature surfaces is locally limited by a suitable size pupil along an optical axis. In assembling, gradually changed curvature lenses are installed within a system so that the two lenses are retained within a fixed distance. Thereby, the or more gradually changed curvature lenses are adjusted and chosen by a local pupil to have a desired local curvature pairs or sets by relative transverse movement or rotation of the two or more lenses. Therefore, the focus of the system is changed to achieve the zooming purposed. By a simple design, the system can be completely matched with the zoom lens set with a fixed distance between the lenses so that the manufacturing cost of the system can be reduced effectively.