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:
May. 05, 1981
Filed:
Sep. 12, 1979
The Mead Corporation, Dayton, OH (US);
Abstract
A lens system for scanning a document positioned on a flat support. The lens system operates in cooperation with apparatus which scans a beam of illuminating light across the document and a scanning mirror, which directs reflected light from the illuminated document in a direction toward an array of photodetectors. The lens system is positioned between the scanning mirror and the photodetector array and includes a movable doublet lens and fixed doublet lens. The movable doublet lens collimates the light through the lens system, while the fixed doublet lens focuses an image of the scanned document portion upon the face of a photodetector array. A set of 6 correcting lenses are arranged symmetrically with respect to a plane of symmetry in a position between the two doublet lenses. A barrel cam and a follower arrangement is provided for moving the movable doublet lens in synchronism with the image scanning mirror, so that optical field flattening is achieved.