Larry R Hedding

US Patent:

6469860, Oct 22, 2002

Filed:

Apr 5, 2000

Appl. No.:

09/543834

Inventors:

Larry R. Hedding - Boulder CO
Donald W. Selg - Westminster CO
Jeffrey M. Waynik - Nederland CO
Joseph P. Falace - Louisville CO
John S. Todor - Westminster CO

Assignee:

Storage Technology Corporation - Louisville CO

International Classification:

G11B 2102

US Classification:

360 75, 360 7802, 360291

Abstract:

The recent trend towards incorporating a higher density of data tracks on magnetic tape has necessitated more accurate mechanisms for positioning tape heads. A system for seeking tracks on a magnetic tape via a fine position adjustment system includes a carriage frame that holds a magnetic tape head. The magnetic tape head reads and writes magnetic tape as the tape passes in close proximity to the tape head. Flexures attach the carriage frame to the tape head permitting movement in a transverse direction normal to the direction of tape travel across the head while restricting movement of the tape head in a direction parallel to tape travel or in a direction normal to the tape surface. A drive mechanism moves the tape head in the transverse direction in response to a control signal. A linear tachometer provides a velocity signal based on the movement of the tape head in the transverse direction. Control logic receives a command to move the tape head in the transverse direction, generates a control signal to change the head position, and modifies the control signal to dampen tape head oscillations relative to the carriage frame based on the velocity signal.

US Patent:

20080048595, Feb 28, 2008

Filed:

Aug 22, 2006

Appl. No.:

11/507748

Inventors:

JiaHong Shu - Singapore, SG
Tze Ming Jimmy Pang - Singapore, SG
Larry Robert Hedding - Boulder CO, US
KianKeong Ooi - Singapore, SG
JuneChristian Ang - Singapore, SG
Kwee Teck Say - Singapore, SG
Danny Joe Kastler - Longmont CO, US

International Classification:

H02P 3/00

US Classification:

318362

Abstract:

A reverse torque, forward commutation motor driver system for a phased motor rapidly decelerates or “brakes” the motor by exciting, in sequence, a complementary excitation signal in each normal commutation state of the forward state machine, thereby providing an active braking effect. After active braking reduces the rotational velocity of the motor below a threshold, a dynamic braking technique can replace the active braking, wherein high-side drivers are set to an opposite voltage as compared to low-side drivers.

US Patent:

6441992, Aug 27, 2002

Filed:

Feb 24, 2000

Appl. No.:

09/512689

Inventors:

Larry Robert Hedding - Boulder CO

Assignee:

Storage Technology Corporation - Louisville CO

International Classification:

G11B 1500

US Classification:

360 95

Abstract:

A tape guide mechanism for guiding a tape media adjacent to a transducer, and methods of operation are disclosed. The tape guide mechanism is a C-shaped guide member rotatably mounted around a first reel. The tape media is normally stored spooled around a second reel within a data cartridge. A tape guide surface is formed circumferentially on the guide member. An opening is provided in the tape guide surface to allow the tape media to reach the first reel. In operation, the tape media can be wrapped and unwrapped from the tape guide surface with any amount of tape media spooled around the first reel. This wrapping and unwrapping ability allows the tape to the loaded onto the first reel at the start of the tape media, or at any arbitrary location on the tape media. It also allows the tape media to be rewound to the second reel directly from the first reel, or with the tape media passing across the tape guide surface. Finally, the tape media can be unwound from the tape guide surface, rapidly moved to a predetermined location on the tape media, and then rewound onto the tape guide surface.