James A Barnard

Author:

James L. Barnard

ISBN #:

0877629226

US Patent:

6480462, Nov 12, 2002

Filed:

Dec 18, 2000

Appl. No.:

09/739953

Inventors:

Bruce Ha - Webster NY
James A. Barnard - Scottsville NY
Thomas C. Burgo - Brockport NY

Assignee:

Eastman Kodak Company - Rochester NY

International Classification:

G11B 724

US Classification:

3692754, 428 644, 3692752

Abstract:

A hybrid optical recording disc having a substrate and a recording layer disposed over the substrate, the substrate having a read-only (ROM) area in which a groove is modulated by depressions in the substrate and a recordable area in which the groove from the read-only area extends into the substrate in the recordable area. The groove in the read-only area forming wobbling tracks having a depth greater than 170 nm and wherein the depth d of the depression in the groove in the read-only area is in a range greater than 170 nm and less than 350 nm.

US Patent:

6497988, Dec 24, 2002

Filed:

Feb 22, 2001

Appl. No.:

09/791322

Inventors:

Yuan-Sheng Tyan - Webster NY
Thomas R. Cushman - Fairport NY
Giuseppe Farruggia - Webster NY
George R. Olin - Webster NY
Bruno Primerano - Walworth NY
Fridrich Vazan - Pittsford NY
James A. Barnard - Scottsville NY

Assignee:

Eastman Kodak Company - Rochester NY

International Classification:

G11B 70045

US Classification:

43027013, 430945, 428 644, 428 645, 428 646

Abstract:

A WORM optical recording element includes a substrate; an amorphous phase-change recording layer disposed over the substrate; a dielectric layer disposed adjacent to the amorphous phase-change layer; a reflector layer disposed adjacent to the dielectric layer; and wherein the material and the thickness of the layers are selected such that recording can be performed on the optical recording element by using a focused laser beam to form crystalline marks in the phase-change layer using laser pulses with less than 40 nS in duration, the reflectivity of the amorphous phase as measured by a collimated beam is higher than 28% and the contrast of the read-back signal is higher than 0. 6, and the second and subsequent writing over previous recording results in at least a 50% increase in read out jitter.

US Patent:

7057993, Jun 6, 2006

Filed:

Jan 29, 2001

Appl. No.:

09/772149

Inventors:

James A. Barnard - Scottsville NY, US
Michael A. Inchalik - Pittsford NY, US
Bruce L. Ha - Webster NY, US

Assignee:

Eastman Kodak Company - Rochester NY

International Classification:

G11B 20/12
G11B 7/24

US Classification:

369 5321, 713165, 713166, 713167, 380201, 380202, 380203, 369 5925, 3692753

Abstract:

A copy-protected optical disc, including a preformed identification number (ID) in the ATIP signal and the subcode which is impressed upon the optical disc and a number of other optical discs during optical disc manufacture, a unique identification number for the optical disc which was written on the optical disc after it is manufactured; and an encrypted program written onto the optical disc wherein the encryption of such program is based upon the preformed ID and the unique ID and includes two or more selectable security levels.

US Patent:

20020141583, Oct 3, 2002

Filed:

Jan 29, 2001

Appl. No.:

09/772333

Inventors:

James Barnard - Scottsville NY, US
Michael Inchalik - Pittsford NY, US
Bruce Ha - Webster NY, US

Assignee:

Eastman Kodak Company

International Classification:

H04N007/167
H04L009/00

US Classification:

380/202000, 705/057000

Abstract:

A copy-protected optical disc, including a preformed ID which is impressed upon the optical disc during optical disc manufacture, a unique ID which was written on the optical disc after it is manufactured; and an encrypted program written onto the optical disc wherein the encryption of such program is based upon the preformed ID and the unique ID.

US Patent:

20020191788, Dec 19, 2002

Filed:

Mar 28, 2001

Appl. No.:

09/819231

Inventors:

Michael Inchalik - Pittsford NY, US
James Barnard - Scottsville NY, US

Assignee:

Eastman Kodak Company

International Classification:

H04N007/167

US Classification:

380/201000

Abstract:

A credit or debit copy-protected optical disc for use with a CD-ROM drive to provide for payment over a network to a seller of supplies or services comprising: a hybrid optical disc having a ROM portion and a RAM portion; the ROM portion including a preformed identification signature which is impressed into the ROM portion of the hybrid optical disc and is arranged to be difficult for a pirate to copy; and the RAM portion being adapted to be written on to include user-specific encrypted information which makes the hybrid optical disc unique or personalized for a specific user and in combination with the ROM preformed identification signature provides a user-personalized secure signature that permits a user to communicate over the network to make payment for ordered products or services with a high degree of assurance that the information on the optical disc is secure from piracy.

US Patent:

48113174, Mar 7, 1989

Filed:

Jun 25, 1987

Appl. No.:

7/066805

Inventors:

James A. Barnard - Conesus NY
Michael G. Fairchild - Rochester NY

Assignee:

Eastman Kodak Company - Rochester NY

International Classification:

G11B 1722

US Classification:

369 32

Abstract:

In an information-bearing disk having, along concentric record tracks, pre-written equally spaced tracking pads which may or may not be aligned radially from one track to another, circuitry serves for improving the response time of a disk drive mechanism during a track-jump operation, i. e. when a read/write transducer head moves radially from one record track to any other track. The circuitry includes a phase-locked loop (PLL), coupled to the transducer head and responsive to a pulsed signal corresponding to the frequency at which the tracking pads sweep past the head, and thereby the actual speed of the disk, for producing an adjustable clock signal which controls the rate at which user data is transferred to or from track segments between adjacent tracking pads. A flip flop, in response to a track-jump operation, resynchronizes the clock signal by resetting the phase of the PLL to match the phase of the tracking pads on the new track while the PLL temporarily latches the frequency of the clock signal until the track jump is completed. This improves the overall response time of a data transfer operation by maintaining an appropriate clock signal with minimal loop error in the presence of a difference in phase between the tracking pads on the previous track and the tracking pads on the track to which the transducer head has been moved.

US Patent:

51404893, Aug 18, 1992

Filed:

Oct 30, 1989

Appl. No.:

7/430695

Inventors:

James A. Barnard - Conesus NY

Assignee:

Eastman Kodak Company - Rochester NY

International Classification:

G11B 2303

US Classification:

360133

Abstract:

A protective cartridge for a data storage disk (e. g. optical, magneto-optical and magnetic disks) has two disk-access apertures which enable the disk to be used with two different types of disk drives, i. e. those which extract the disk from the cartridge prior to a record/playback operation, and those which record/playback information on the disk while rotating the disk within the cartridge. One aperture is provided in a side wall of the cartridge and is sized to allow a disk to be inserted into or extracted from the cartridge interior, and the other aperture is provided in the top and/or bottom wall(s) of the cartridge to expose a sufficient portion of the disk to enable it to be rotated within the cartridge and to have data recorded or played back over its entire data-recording surface(s). Two different cartridge doors prevent dirt and other contaminants from entering the cartridge interior through the disk-access apertures.

US Patent:

55983863, Jan 28, 1997

Filed:

Jan 23, 1995

Appl. No.:

8/376567

Inventors:

Boris A. Shtipelman - Rochester NY
James A. Barnard - Scottsville NY

Assignee:

Eastman Kodak Company - Rochester NY

International Classification:

G11B 709

US Classification:

369 4414

Abstract:

A focus/tracking actuator for controlling the respective focus and tracking positions of a lens used to direct a focused beam of radiation onto a desired data track on a moving recording element comprises a pair of moving coil-type linear motors. Each of the motors comprises a coil of wire disposed in a magnetic air gap and adapted to move therein in response to an applied current flow. According to the invention, the respective masses of the motor coils are optimized to achieve maximum acceleration with minimum power comsumption. Preferably, the coils have a combined mass substantially equal to the mass of the moving payload, which includes the lens assembly and its movable support.