John C Urbach

Author:

John C. Urbach

ISBN #:

0892521015

US Patent:

41308980, Dec 19, 1978

Filed:

Aug 29, 1977

Appl. No.:

5/828801

Inventors:

John C. Urbach - Portola Valley CA
David Cheng - Palo Alto CA

Assignee:

Xerox Corporation - Stamford CT

International Classification:

G11C 1308
G11C 700

US Classification:

365215

Abstract:

An optical data recording system in which during recording the writing beam is made to move at the same velocity as the recording medium whereby motion blur is minimized or reduced. Movement of the writing beam at the same velocity as the recording medium is achieved by supplying a constantly varying frequency RF signal to an acousto-optic device which deflects (diffracts) the writing beam in accordance with the instantaneous frequency of the RF signal. The acousto-optic device can also be utilized to amplitude modulate the writing beam.

US Patent:

41621212, Jul 24, 1979

Filed:

Apr 14, 1977

Appl. No.:

5/787406

Inventors:

Gary K. Starkweather - Saratoga CA
John C. Urbach - Portola Valley CA

Assignee:

Xerox Corporation - Stamford CT

International Classification:

G02F 133

US Classification:

350358

Abstract:

An acousto-optic device including an acousto-optic medium having a plurality of closely spaced transducers bonded thereto in a linear array. A signal of the same frequency is supplied to those transducers which are to diffract out or deflect elemental portions of a light beam incident upon the acousto-optic medium to thereby provide a plurality of light spots which can be written in parallel.

US Patent:

46637389, May 5, 1987

Filed:

Dec 4, 1984

Appl. No.:

6/678145

Inventors:

Robert A. Sprague - Saratoga CA
John C. Urbach - Portola Valley CA

Assignee:

Xerox Corporation - Stamford CT

International Classification:

G11C 1142

US Classification:

365127

Abstract:

A block oriented solid state optical memory having a distributed data storage architecture comprises a lens array including a plurality of laterally separated lenslets which have numerical apertures selected to cause them to focus essentially diffraction limited images of a photoemitter array in parallel onto laterally displaced sections of a data mask, so that the images optically align with respective photosensors. The lenslets are formed on the first surface of the lens array, and the data mask is supported on or very close to the last surface of the lens array to minimize the scattering of reflected light. An opaque light shield on the first surface of the lens array optically masks the area between the lenslets to eliminate unwanted stray light. Furthermore, in at least some embodiments of the invention, the light shield extends into the apertures of the lenslets to stop them down sufficiently to obtain substantially diffraction limited performance.

US Patent:

41225511, Oct 24, 1978

Filed:

Apr 8, 1977

Appl. No.:

5/785884

Inventors:

John C. Urbach - Portola Valley CA

Assignee:

Xerox Corporation - Stamford CT

International Classification:

G11C 1304

US Classification:

365234

Abstract:

An optical data storage and display system which utilizes the recorded pattern on an optical disk to modulate directly the output or writing light beam incident thereon, thereby eliminating the light modulator of conventional output scanner systems. The optical disk is fixed coaxially to the same motor drive shaft as a rotating multi-faceted output scanner such that each facet of the scanner automatically corresponds geometrically to a data sector of the optical disk, thereby eliminating the need for servo synchronization between the optical disk and the scanner and the large data buffering that such servo synchronization necessitates.