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:
Mar. 23, 1993
Filed:
Oct. 10, 1990
Melvin E Swanberg, Claremont, CA (US);
Xerox Corporation, Stamford, CT (US);
Abstract
A swept frequency modulator for use in a 'Scophony' raster output scanner is disclosed. Input video [136] is mixed with a fixed RF frequency [137] provided by a fixed frequency oscillator [138], in a first mixer [139]. The resulting amplitude modulated RF [140] is fed into a vestigial sideband filter [142], producing a vestigial sideband signal [144], which is in turn fed into a second mixer [148], where it is mixed with a swept RF frequency [147]. The output of the second mixer [148] is swept frequency vestigial sideband RF [150], which is input to a driver [152]. The driver [152] drives an acoustooptic modulator [154], which modulates optical beam [156] to produce a modulated, facet-tracking beam [158]. The modulated optical beam [158] tracks a facet of a rotating mirror array which scans it across the photoreceptor. The invention enables achievement of all the potential advantages of a Scophony raster output flying spot scanner: (a) high image resolution, (b) improved depth of focus, and (c) linear system response.