Richard Cartez Wilkinson

US Patent:

6570840, May 27, 2003

Filed:

Apr 26, 2000

Appl. No.:

09/558071

Inventors:

Richard L. Wilkinson - Whittier CA
John H. Rilum - Tustin CA
Carlyle J. Eberly - Huntington Beach CA
John R. Holmes - Garden Grove CA

Assignee:

Optical Disc Corporation - Santa Fe Springs CA

International Classification:

G11B 724

US Classification:

3692754

Abstract:

Disclosed are improvements in the transverse sectional shape of three-dimensional features displayed in optical recording structuresâdiscs, cylinders, cards, multi-layered devices and structures replicated from themâto increase Figure of Merit. The cross-sectional shape improvements include reductions in berm height and width, dual level data marks and tracking guides, and land areas projecting above or into the surface of the recording structure. Disclosed methods include dual and/or dithered beam writing onto the structure and improved composition of the active layer of the structure. Also disclosed are apparatus for producing such improved features on optical recording structures, according to one or more of the disclosed methods.

US Patent:

6785221, Aug 31, 2004

Filed:

Mar 7, 2003

Appl. No.:

10/384426

Inventors:

Richard L. Wilkinson - Whittier CA
John H. Rilum - Tustin CA
Carlyle J. Eberly - Huntington Beach CA
John R. Holmes - Garden Grove CA

Assignee:

Optical Disc Corporation - Santa Fe Springs CA

International Classification:

G11B 724

US Classification:

3692754, 369 5925

Abstract:

A method to produce improvements in the shape of three-dimensional features displayed in optical recording structures, particularly in such structures displaying features of differing dimensional characteristics. The shape improvements include reductions in berm height and width, dual level data marks and tracking guides, and land areas projecting above or into the surface of the recording structure. The method includes dual and/or dithered beam writing onto the structure and improved composition of the active layer of the structure.

US Patent:

7102991, Sep 5, 2006

Filed:

Mar 7, 2003

Appl. No.:

10/384471

Inventors:

Richard L. Wilkinson - Whittier CA, US
John H. Rilum - Tustin CA, US
Carlyle J. Eberly - Huntington Beach CA, US
John R. Holmes - Garden Grove CA, US

Assignee:

Optical Disc Corporation - Santa Fe Springs CA

International Classification:

G11B 7/24

US Classification:

3692754

Abstract:

Improvements in the shape of three-dimensional features displayed in optical recording structures, particularly in such structures displaying features of differing dimensional characteristics. The shape improvements include reductions in berm height and width, dual level data marks and tracking guides, and land areas projecting above or into the surface of the recording structure.

US Patent:

7190661, Mar 13, 2007

Filed:

Mar 11, 2005

Appl. No.:

11/078547

Inventors:

Richard L. Wilkinson - Whittier CA, US
John H. Rilum - Tustin CA, US
Carlyle J. Eberly - Huntington Beach CA, US
John R. Holmes - Garden Grove CA, US

Assignee:

Optical Disc Corporation - Santa Fe Springs CA

International Classification:

G11B 7/24

US Classification:

3692751, 3692754

Abstract:

Improvements in the shape of three-dimensional features displayed in optical recording structures, particularly in such structures displaying features of differing dimensional characteristics. The shape improvements include reductions in berm height and width, dual level data marks and tracking guides, and land areas projecting above or into the surface of the recording structure.

US Patent:

20030174595, Sep 18, 2003

Filed:

Mar 7, 2003

Appl. No.:

10/384441

Inventors:

Richard Wilkinson - Whittier CA, US
John Rilum - Tustin CA, US
Carlyle Eberly - Huntington Beach CA, US
John Holmes - Garden Grove CA, US

International Classification:

G11B007/095

US Classification:

369/044130, 369/094000

Abstract:

An apparatus to produce optical recording structures displaying improvements in the shape of three-dimensional features displayed therein. The shape improvements include reductions in berm height and width, dual level data marks and tracking guides, and land areas projecting above or into the surface of the recording structure. The apparatus may include dual and/or dithered beam writing elements.

US Patent:

52971295, Mar 22, 1994

Filed:

Dec 24, 1992

Appl. No.:

7/996729

Inventors:

Richard L. Wilkinson - La Mirada CA
Stephen P. Brown - Santa Ana CA
Shigang Li - Norwalk CA

Assignee:

Optical Disc Corporation - Santa Fe Springs CA

International Classification:

G11B 700

US Classification:

369116

Abstract:

Method and apparatus for improving the characteristics of the surface effects recorded on an optical disc, for use with an optical recording apparatus which includes a writing light beam source and an optical modulator for modulating the intensity of the writing beam of light above and below a threshold level of a moving recording medium in response to a modulator drive signal for recording information on the medium, the light beam being capable of forming a track of surface effects or indicia in the moving recording medium when the writing beam is above threshold and incapable of forming surface effects in the moving recording medium when the writing beam is below threshold. The method includes receiving a substantially rectangular waveform having leading and trailing edges, provided as a modulator drive signal to modulate the writing beam to a peak power above threshold and to a minimum power level below thresholds, respectively, and producing a shaped modulator drive signal by increasing the peak power of the writing beam responsive to the occurrence of the leading edges, by decreasing the time the shaped modulator drive signal is above threshold in order to maintain a prescribed duty cycle in the track of surface effects in the moving recording medium, and by producing symmetrical leading and trailing edges of the surface effects.

US Patent:

56087128, Mar 4, 1997

Filed:

Mar 8, 1995

Appl. No.:

8/400672

Inventors:

John H. Rilum - Tustin CA
Richard L. Wilkinson - La Mirada CA
Shigang Li - Norwalk CA
John F. Browne - Laguna Niguel CA
William W. Boyle - Covina CA

Assignee:

Optical Disc Corporation - Santa Fe Springs CA

International Classification:

G11B 700

US Classification:

369116

Abstract:

Method and apparatus for improving the characteristics of the surface effects on a replicated optical disc the master for which is recorded on an optical recording apparatus which includes a writing light beam source and an optical modulator for modulating the intensity of the writing beam of light above and below a threshold level of a relatively moving recording medium in response to a modulator drive signal for recording information on the medium, the light beam being capable of forming a track of surface effects or indicia in the relatively moving master recording medium when the writing beam is above threshold and incapable of forming surface effects in the relatively moving recording medium when the writing beam is below threshold. The method includes receiving a substantially rectangular waveform intended to control the optical modulator. In one aspect of the invention, a radius dependent duty cycle ramp function is introduced into the optical modulator drive signal for altering the depth or height of recorded pits or bumps on the recording medium to compensate for the depth or height versus radius phenomenon experienced in the molding process.