John C Heinz

US Patent:

6442004, Aug 27, 2002

Filed:

Sep 27, 2000

Appl. No.:

09/670634

Inventors:

John Eric Heinz - Plymouth MN

Assignee:

Imation Corp. - Oakdale MN

International Classification:

G11B 556

US Classification:

360291

Abstract:

A magnetic head element linear actuator assembly including a base, a platform, a core, a coil, a plurality of slats and a plurality of magnetic bars. The platform is positioned opposite the base and is configured to maintain a magnetic recording head. The core is disposed between the base and the platform such that a space is defined between the core and the platform. The coil is wound about a central axis of the core. The plurality of slats rigidly maintain the platform relative to the base. Further, the plurality of slats are deflectable from a straightened state and are biased to return to the straightened state following deflection. Finally, the magnetic bars are secured to respective ones of the plurality of slats adjacent the coil. With this configuration, a magnetic field generated by the coil induces deflection of the plurality of slats via the magnetic bars. In response, the platform moves linearly toward the base.

US Patent:

6822827, Nov 23, 2004

Filed:

Jun 7, 2001

Appl. No.:

09/876415

Inventors:

John E. Heinz - Plymouth MN
Curtis B. Hause - St. Paul MN
Helen J. Yoo - Maplewood MN

Assignee:

Imation Corp. - Oakdale MI

International Classification:

G11B 5325

US Classification:

360118

Abstract:

Methods and apparatus for erasing magnetic tape are described. The tape to be erased is fed through an erasure unit that includes an array of magnetic elements. The array of magnetic elements includes a first set of magnetic elements and a second set of magnetic elements. The magnetic fields for the respective first and second sets of magnetic elements have opposite polarity, as seen by the tape as it feeds through the erasure unit. The fields seen by the tape as it feeds through the erasure unit decrease in intensity.

US Patent:

7557544, Jul 7, 2009

Filed:

Apr 23, 2007

Appl. No.:

11/788924

Inventors:

John E. Heinz - Plymouth MN, US
Brian G. Haupt - Stillwater MN, US

Assignee:

Cummins Power Generation IP, Inc. - Minneapolis MN

International Classification:

H02P 9/44
G05F 1/10

US Classification:

322 20, 322 36, 322 37, 363 45

Abstract:

One system of the present application includes an electric power generation device structured to provide an AC electric power output at a target frequency. This device includes: an electric power generator; a sensing arrangement structured to provide samples corresponding to magnitude of the AC electric power output; and a controller including operational logic responsive to the sensing arrangement to calculate a peak amplitude as a function of a waveform period corresponding to the target frequency and two of the samples separated in time by a target duration of 20 to 30 percent of the waveform period and determine a zero crossing of the output from the peak amplitude and the target frequency. The operating logic is further structured to control operation of the device in accordance with the zero crossing.

US Patent:

43576400, Nov 2, 1982

Filed:

Oct 24, 1980

Appl. No.:

6/200385

Inventors:

John E. Heinz - Plymouth MN
M. Grant Albrecht - Minneapolis MN

Assignee:

Nortronics Company, Inc. - Minneapolis MN

International Classification:

G11B 520
G11B 522

US Classification:

360119

Abstract:

A thin film magnetic transducer having a pair of planar core pieces with front and rear legs and a coil formed around the rear legs. The coil is preferably formed by deposition where turns of the coil have a bottom pieces, riser portions and top pieces which are interconnected to form the coil. In the preferred embodiment, the transducer track width is terminated by means of termination portions which extend into the transducer gap. These portions are preferably defined to create a more uniform flux density at the edges of the track width. In addition, the flux density across the track width is preferably made more uniform by including a curve portion along the rear edge of the front legs. This curve portion may also follow an exponential formula to achieve this uniform density.

US Patent:

53392027, Aug 16, 1994

Filed:

Mar 26, 1993

Appl. No.:

8/037285

Inventors:

John E. Heinz - Plymouth MN
Michael E. Hamerly - Vadnais Heights MN
Richard W. Molstad - St. Paul MN
Theodore A. Schwarz - Woodbury MN
Robert J. Youngquist - White Bear Lake MN

Assignee:

Minnesota Mining and Manufacturing Company - St. Paul MN

International Classification:

G11B 509
G11B 5035

US Classification:

360 46

Abstract:

An adjustable write-equalized recording circuit for recording data onto a magnetic tape. The circuit variably adjusts the amplitude of write-equalization pulses relative to the data waveform by an amount that can be either preset or determined during operation.