Leland W Ford
Engineers at Crestone Cir, Boulder, CO

4326796, Apr 27, 1982

Dec 13, 1979

6/103143

James R. Champion - Longmont CO
Larry M. Ernst - Boulder CO
Leland W. Ford - Boulder CO
Ronald G. Velarde - Longmont CO

International Business Machines Corporation - Armonk NY

G03G 1502

355 14CH

Factors affecting copy quality are continuously adjusted during copying in accordance with the actual charge on the photoconductor relative to a fixed reference potential. The photoconductor, carried on a moving, partially exposed, constant potential conductive support, is sensed by a probe. The probe supplies a signal as a function of the potential on portions of the photoconductor and the conductive support passing by the probe. A circuit converts the probe signals into digitized values representing the current photoconductor potential relative to the support. The digitized values adjust copier parameters to compensate for deviations of photoconductor potential from predetermined desired values.

4210858, Jul 1, 1980

Apr 19, 1978

5/897897

Leland W. Ford - Boulder CO
Alberto M. Ramirez - Tucson AZ
Gerald L. Smith - Broomfield CO

International Business Machines Corporation - Armonk NY

G03G 1500, H01T 1900

323 22T

A compact and lightweight power supply particularly suited for use as a high voltage supply capable of switching voltage values in short time. The high voltage output is compared against a desired reference value to produce a difference voltage which is integrated. The integrated difference voltage is converted to recurrent pulses having a corresponding width. The pulses are applied alternately to the opposite ends of a centertapped primary winding of a specially wound transformer characterized by a specially wound secondary winding and an air-gapped E-shaped core linking the primary and secondary windings. The secondary voltage is applied to a voltage multiplier circuit to produce the high voltage output of the power supply.