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. 15, 2001
Filed:
Dec. 23, 1999
Robert F. Hartmann, Westford, MA (US);
Patrick J. Hegarty, Roslindale, MA (US);
Timothy R. Crawford, Needham, MA (US);
Thomas H Campbell, East Falmouth, MA (US);
Polaroid Corporation, Cambridge, MA (US);
Abstract
A scanning system for a film recorder utilizes multiple digital-to-analog converters (DACs) to produce a linear output for a vertical deflection circuit which drives a vertical yoke circuit for controlling a CRT beam in a film recorder. The system contains a coarse DAC, a fine DAC, and a delta DAC which provides a signal representing the analog change from line to line. A summing circuit, a difference amplifier, a A/D converter, and a calibration sequence controlled by a DSP create a table to effectively increase the resolution and linearity of the deflection output signal.