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:
Jun. 28, 1977
Filed:
Dec. 15, 1975
Douglas Wright Broyles, San Jose, CA (US);
Troy Cecil Stark, Campbell, CA (US);
The Singer Company, Binghamton, NY (US);
Abstract
A mirror driven by a resonant mechanical oscillator is used to scan a laser beam across a document. The incident laser beam line scans the record and is absorbed or reflected depending upon the presence or absence of an image on the record. The reflected intensity modulated light is detected by photomultiplier tubes which provide a video analog signal. An A/D device digitizes the analog signal forming a DATA OUT signal. The laser beam scan velocity across the document varies sinusoidally because of the resonant nature of the drive system. The data flow, or bit density of DATA OUT, has a corresponding sinusoidal variation. A write rate controller provides a variable clock which accompanies the DATA OUT. The variable clock has a periodic variation which matches the scan velocity. The rate of the variable clock matches the bit density of DATA OUT causing DATA OUT to be entered into a data bank properly notwithstanding its nonuniform bit density.