Raphael Bustin

US Patent:

20130114117, May 9, 2013

Filed:

Nov 8, 2012

Appl. No.:

13/672239

Inventors:

Raphael Bustin - Bedford MA, US

Assignee:

CONEXANT SYSTEMS, INC. - Newport Beach CA

International Classification:

H04N 1/40

US Classification:

358475

Abstract:

This disclosure provides systems and methods for decoupling the mechanical drive systems of image scanners from the exposure system. A light source, such as an array of light-emitting diodes (LEDs), may be modulated in order to maintain a constant exposure for each scan-line, regardless of the document velocity. Accordingly, the present systems and methods allow for continuous document scanning at varying speeds. An automatic document feeder may dynamically adjust the velocity of a document without negatively impacting the exposure of the image scan. As the velocity of the document is changed, the modulation rate of the light source may be adjusted to maintain a constant exposure.

US Patent:

42297036, Oct 21, 1980

Filed:

Feb 12, 1979

Appl. No.:

6/011358

Inventors:

Raphael Bustin - Rockport MA

Assignee:

Varian Associates, Inc. - Palo Alto CA

International Classification:

H03K 500

US Classification:

328162

Abstract:

A zero reference and offset compensation circuit for an operational amplifier operating in the inverting mode in order to correct for both current and voltage offset errors. The zero reference and offset compensation circuit includes comparators for comparing the zero condition output of the operational amplifier with representations of lower and upper boundary signal levels, a pair of digital-to-analog converters having their respective analog outputs connected through appropriate scaling networks to the inverting input terminal and to the non-inverting input terminal of the operational amplifier, a microprocessor connected to the output of the comparators for providing an input to the associated digital-to-analog convertor so it produces an incremented digital signal whenever the comparators indicate the zero condition signal output exceeds either boundary signal level, the incremented digital signal being incremented in a direction to drive the associated digital-to-analog converter in a direction to bring said zero condition signal within the boundary which has been exceeded. The microprocessor has a current range selection capability so that the digital-to-analog converter connected to the inverting terminal is incremented for nanoampere range signal currents and the digital-to-analog converter associated with the non-inverting terminal is incremented for signal currents in the microampere range and above.