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. 01, 1987
Filed:
Dec. 01, 1986
Ronald W Froelich, Covina, CA (US);
Other;
Abstract
A device employing the optical autocorrelation method for automatically comparing the fingerprint of an individual with a previously identified exemplar utilizes a pair of multifaceted mirrors rotating about mutually perpendicular axes to sweep an image of the fingerprint over the surface of the exemplar in a raster. To maintain the image in focus, a pair of independent identical relay lens systems are positioned in the light path and arranged symmetrically with respect to a common intermediate image plane. The mirrors are positioned so that as they rotate their reflective facets coincide successively with the aperture stop locations of the respective lens system. To compensate for possible angular misalignment of the fingerprint and the exemplar, novel independent optical means are provided for effectively rotating the image about the principal axis of the light path.