Charles P Reilly

US Patent:

43142621, Feb 2, 1982

Filed:

Feb 4, 1980

Appl. No.:

6/118345

Inventors:

Charles M. Reilly - Pasadena CA

Assignee:

Xerox Corporation - Stamford CT

International Classification:

G01D 1534
G01D 1510

US Classification:

3461351

Abstract:

An optical data recording media which is optimized to yield maximum absorption of the incident recording light and to be responsive to the light incident over a relatively wide range of angles. A transparent dielectric coating is utilized in combination with a metal layer and provides maximum absorption by the metal layer of the recording light incident at various angles for both S and P polarizations. The selected coatings also yield a high contrast ratio for reflectivity at different wavelengths.

US Patent:

44645678, Aug 7, 1984

Filed:

Jun 30, 1981

Appl. No.:

6/279101

Inventors:

Charles Reilly - Pasadena CA
Leonard Laub - Pasadena CA
Krishna Swaminathan - Santa Monica CA

Assignee:

Storage Technology Corporation - Louisville CO

International Classification:

G01J 136

US Classification:

250204

Abstract:

Apparatus for reading information stored in a track pattern on a radiation reflecting record comprises a source of radiation such as a laser, a diffraction grating for providing at least a zero order beam component and a pair of first order beam components, an objective lens assembly, a photodetector array, the photodetector array comprising a unitary data photodetector disposed for impingement of the zero order beam component for sensing stored information and at least first and second paired photodetector arrays adjacent to the data photodetector including separated sectors disposed along an axis including the data photodetector for providing at least focus error correction signals to the objective lens assembly, and means provided in the optical path between the objective lens assembly and the photodetector array for providing a first portion of the reading beam components which remains relatively fixed in size and a second portion of the reading beam components which varies substantially linearly in size as the record deviates from a plane of focus.

US Patent:

44581440, Jul 3, 1984

Filed:

Jun 30, 1981

Appl. No.:

6/279100

Inventors:

Charles Reilly - Pasadena CA
Leonard Laub - Pasadena CA
Dennis Rose - Claremont CA

Assignee:

Storage Technology Corporation - Louisville CO

International Classification:

G01J 136

US Classification:

250204

Abstract:

Apparatus for reading information stored in a track pattern on a radiation reflecting record comprises a source of radiation such as a laser for supplying at least a reading beam, an objective lens assembly for passing the reading beam to the record and for controllably focusing the reading beam at a plane of focus, a photodetector array disposed in an optical path with the lens assembly for sensing at least the recorded information and focusing errors, and an astigmatic element disposed in the optical path for producing an astigmatic image of the reading beam in which the photodetector array comprises a unitary data photodetector disposed for impingement thereon of a zero order reading beam component for sensing the recorded information, and a quadrant photodetector array adjacent to the unitary data photodetector and including separated sectors disposed along orthogonal axes for sensing relative differences of the astigmatic image along the orthogonal axes to provide at least focus error correction signals to the objective lens assembly.