Robert G Dobbin

US Patent:

RE345067, Jan 11, 1994

Filed:

Oct 22, 1992

Appl. No.:

7/965155

Inventors:

Robert B. Dobbin - Irvine CA
David G. Loeppky - Irvine CA
James R. Norton - Mineola KS
Bruce E. Del Mar - Laguna Beach CA

Assignee:

Del Mar Avionics - Irvine CA

International Classification:

G11B 700

US Classification:

369 58

Abstract:

The invention discloses a simplified four step process for making an optical disc master or alternatively a WORM disc by first making or obtaining a transparent polymer disc with a tracking groove of desired geometry molded therein, then spin coating an optically active lamina on the grooved side of the disc, then recording data on said polymer disc with groove controlled and tracked laser means by ablating active lamina, forming pits, the shape of which is determined by the groove geometry and finally depositing a conductive and reflective lamina over the pitted active lamina. To change the OD master to an OD WORM, a protective cover is added to the electrically conductive and optically reflective lamina.

US Patent:

52933709, Mar 8, 1994

Filed:

Jan 16, 1991

Appl. No.:

7/641696

Inventors:

Robert C. Beauchamp - Westminster CA
Jim Norton - Minneola KS
Robert Dobbin - Irvine CA
David Loeppky - Irvine CA

Assignee:

Del Mar Avionics - Irvine CA

International Classification:

G11B 700

US Classification:

369109

Abstract:

Method and apparatus for a portable clean environment used for recording optical disc masters by enclosing a light sensitive optical disc in a container that prevents ambient contamination from destroying the pristine environment necessary to create optical disc masters. A transparent optical disc, having an optically active lamina on at least one surface of the transparent optical disc, is enclosed in a dish shaped container that is generally free of particulate larger than 0. 2 microns, the enclosure assembly effectively preserving a class 10 cleanroom environment. The dish shaped enclosure isolates the surface of the optical disc used to record data from contamination due to ambient conditions while exposing the nonwriting surface of the optical disc to enable laser writing. A foil seal protects the exposed nonwriting surface of the optical disc from ambient contamination during storage and until recording is desired. Once recording is desired, the foil seal is removed, the entire assembly is placed on the spindle of a turntable, and the transparent optical disc allows laser light to pass through the optical disc and focus on the optically active lamina to form pits within the optically active lamina by either ablating the lamina or by consuming the lamina.

US Patent:

50994697, Mar 24, 1992

Filed:

Feb 20, 1990

Appl. No.:

7/482033

Inventors:

Robert B. Dobbin - Irvine CA
David G. Loeppky - Irvine CA
James R. Norton - Mineola KS
Bruce E. Del Mar - Laguna Beach CA

Assignee:

Del Mar Avionics - Irvine CA

International Classification:

G11B 700

US Classification:

369 58

Abstract:

The invention discloses a simplified four step process for making an optical disc master or alternatively a WORM disc by first making or obtaining a transparent polymer disc with a tracking groove of desired geometry molded therein, then spin coating an optically active lamina on the grooved side of the disc, then recording data on said polymer disc with groove controlled and tracked laser means by ablating active lamina, forming pits, the shape of which is determined by the groove geometry and finally depositing a conductive and reflective lamina over the pitted active lamina. To change the OD master to an OD WORM, a protective cover is added to the electrically conductive and optically reflective lamina.