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. 23, 2005
Filed:
Dec. 06, 1999
Péter Kalló, Budapest, HU;
Péter Kalló, Budapest, HU;
Guardware Systems Informatikai Kft., Budapest, HU;
Abstract
An objective lens system (), particularly for a fingerprint reader apparatus, said lens system () comprising a first lens () formed as a condensing lens guiding light beams arriving from an object generally telecentrically, an aperture stop () having a centre (P) and being located in the vicinity of a focal point of the first lens (), a correcting second lens () arranged between the first lens () and the aperture stop () and juxtaposed with the aperture stop (), and a correcting third lens () formed as a condensing lens and arranged beside the aperture stop () opposite the second lens (). According to the invention, the second lens () is a condensing lens with a spherical surface (S) facing the first lens (), wherein the curvature centre of the surface (S) is at a distance shorter than 15% of the curvature radius of the surface (S) from the centre (P) of the aperture stop (), and the aperture stop () is arranged at a distance shorter than 25% of the focal length of the first lens () from the focal point of the first lens ().
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile