Thomas Milton Horning

US Patent:

43244742, Apr 13, 1982

Filed:

May 21, 1980

Appl. No.:

6/152071

Inventors:

Edward J. Kraemer - Canoga Park CA
Robert D. Therien - Newbury Park CA
Michael W. Rudy - Thousand Oaks CA
Frederick E. Walsh - Reseda CA
Han J. Lee - Simi Valley CA
Ronald Bell - North Hollywood CA
Thomas D. Horning - Sepulveda CA

Assignee:

Terminal Data Corporation - Woodland Hills CA

International Classification:

G03B 2758
G03B 2764
G03B 2780

US Classification:

355 65

Abstract:

A system for microfilming documents that employs microprocessor control to insure fault-free operation. The aspects of operation; such as document present, size of document, size of photographic mask, the exposure parameter, and system "ready", must meet necessary criteria, or the microprocessor will halt operations and present a human-readable response as to the cause. Substitutional tables for supporting documents are available, to relate to the characteristics of the document. Simultaneous conflicting commands are executed sequentially according to a priority sequence.

US Patent:

42141940, Jul 22, 1980

Filed:

Dec 2, 1977

Appl. No.:

5/856649

Inventors:

Thomas Horning - San Fernando CA

Assignee:

Data Products Corporation - Woodland Hills CA

International Classification:

H02K 3700

US Classification:

318696

Abstract:

A method for driving stepping motors, typically used in digital hard copy printers, can be employed wherein the phased stator coils of the stepping motor are energized in an overlapping relationship. In addition, the voltage or current applied to the stator coils in a stepping motor may be driven in a pulsed manner such that certain portions of the energized duration are characterized by a higher driving current or voltage. By virtue of the simultaneous activation of the adjacent phases of the stator coils, quasi-equilibrium positions may be created between the equilibrium positions in a stepping motor with the result that a smoother and more uniform angular accelerations and decelerations can be obtained. Circuitry conducive to a digital application to practice the method of the present invention employs a multiple bit shift register driven by a decoder and which in turn drives a plurality of operational amplifiers. Another operational amplifier coupled to the decoder provides a controlled current source.