Yung C Yip14567 32Nd St S, Afton, MN 55001

6535351, Mar 18, 2003

Nov 14, 2001

09/992175

Yung Yip - Afton MN
Daniel P. Stubbs - Marine on St. Croix MN

Imation Corp. - Oakdale MN

G11B 533

36011401

In one embodiment, the invention is directed toward a magneto-optic read head formed to suppress magnetic exchange coupling at regular intervals along a lateral direction of the read head. For example, in the region of the magneto-optic read head where light is reflected, i. e. , the optical scanning region, the read head may be formed with a series of ferromagnetic exchange breaks that reduce lateral permeability of magnetic fields, and hence reduce lateral flux through the read head. In this manner, the effective resolution of the read head can be increased, thereby facilitating readout of data stored on narrower data tracks.

6542321, Apr 1, 2003

Dec 29, 1999

09/474360

Richard W. Molstad - St. Paul MN
Tim T. Ngo - Burnsville MN
Yung Yip - Afton MN

Imation Corp. - Oakdale MN

G11B 517

360 31, 360 25

A magnetic tape recording system employing a single bump read-while-write head, methods of minimizing crossfeed signals between the read and write channels of magnetic tape recording systems, and electronic circuitry to implement such methods.

6753078, Jun 22, 2004

Oct 30, 2001

10/003219

Alexander Roesler - Rochelle TX
Yung Yip - Afton MN

Imation Corp. - Oakdale MN

G11B 566

428336, 428694 R, 428694 TS, 428900

A magnetic recording medium includes a highly permeable magnetic layer proximal to a recording layer. During recording, the permeable magnetic layer modifies the recording field from a recording head to produce consistently shaped recording transitions with a significant perpendicular component. The transitions are consistently shaped even though the distance between the recording head and the surface of the medium may change. Transitions so formed result in a reduction of noise from the medium surface roughness. The permeable magnetic layer further reduces noise caused by stray dipole fields.

6757128, Jun 29, 2004

Sep 11, 2002

10/241196

Yung Yip - Afton MN

Imation Corp. - Oakdale MN

G11B 5584

360 7712

A system and method to minimize the contribution of head channel spacing to the negative effects of transverse changes in dimensions of recording media having prerecorded servopositioning tracks. Multiple channels on the recording head are separated into multiple groups of head channels, and each group of heads is independently positioned relative to the pre-written servo tracks. The head comprises an actuator for each pair of head groups. The actuator adjusts the relative spacing between members of the pair in response to position error signals indicating misalignment between the heads and the pre-written servopositioning tracks on the medium.

6884503, Apr 26, 2005

Jun 3, 2004

10/860686

Alexander Roesler - Rochelle TX, US
Yung Yip - Afton MN, US

Imation Corp. - Oakdale MN

B32B005/16

428336, 428694 R, 428694 TS

A magnetic recording medium includes a highly permeable magnetic layer proximal to a recording layer. During recording, the permeable magnetic layer modifies the recording field from a recording head to produce consistently shaped recording transitions with a significant perpendicular component. The transitions are consistently shaped even though the distance between the recording head and the surface of the medium may change. Transitions so formed result in a reduction of noise from the medium surface roughness. The permeable magnetic layer further reduces noise caused by stray dipole fields.

6914756, Jul 5, 2005

Feb 10, 2003

10/361391

Richard W. Molstad - St. Paul MN, US
Tim T. Ngo - Burnsville MN, US
Yung Yip - Afton MN, US

Imation Corp. - Oakdale MN

G11B005/33
G11B005/265

360316, 360317, 360121, 360122

A magnetic tape recording system employing a single bump read-while-write head, methods of minimizing crossfeed signals between the read and write channels of magnetic tape recording systems, and electronic circuitry to implement such methods.

6940672, Sep 6, 2005

Dec 23, 2003

10/744998

Daniel P. Stubbs - Marine on St. Croix MN, US
Yung Yip - Afton MN, US

Imation Corp. - Oakdale MN

G11B005/02

360 55, 360134

In general, the invention provides two-sided magnetic data storage tape comprising azimuthal magnetic transition layouts that can substantially reduce demagnetization of recorded magnetic transitions on the surfaces of the tape. The invention specifically balances the goal of simplified media manufacture with the goal of reducing or avoiding media degradation when the tape is spooled. The two-sided magnetic data storage tape defines a substantially similar easy axis of magnetic anisotropy on a first and a second side of the tape, which can simplify media manufacture. Recorded magnetic transitions on the opposing sides of the tape define azimuths that are substantially different, which can help avoid media degradation when the tape is spooled.

6952317, Oct 4, 2005

Jun 17, 2003

10/464394

Richard W. Molstad - St. Paul MN, US
Yung Yip - Afton MN, US

Imation Corp. - Oakdale MN

G11B005/09
G11B005/584
G11B005/02

360 48, 360 57, 360 7712

The invention is directed to a magnetic storage medium recorded with an amplitude-based servo pattern in which one or more first servo windows positioned above a centerline of a servo track have a different width than one or more second servo windows positioned below the centerline. The first servo windows may be larger or smaller than the second servo windows. In either case, by detecting the widths of the servo windows and detecting signal amplitude as a servo head passes relative to the servo track, servo tracking can be achieved without the use or need for additional synchronization marks in the servo pattern.