Search

Bernhard Ernst Knigge

from Maitland, FL
Age ~54
Get Report
Also known as:
Bernhard E Knigge, Bernhard So Knigge, Bernard Ernst Knigge, Benhard E Knigge, Bernard E Knigge, Bemhard E Knigge, D Knigge
Related to:
Kellie M Leonard, 55Alicia G Unibe, 91Guadalupe Unibe, 58Sergio Uribe, 62Consuelo Unibe, 98Armando G UnibeCarlos UnibeLena R Parent, 38Claudia Uribe, 55
Connected to:
Crystal J Knigge, 45Dorothea M Knigge, 43Kent W Knigge, 65Larry A Knigge, 73Nicole L Knigge, 34Patrick C Knigge, 62Patricia Knigge, 84Verneil I Knigge, 88Wanda L Knigge, 87Abigail E Knight, 44

Bernhard Knigge Phones & Addresses

  • Maitland, FL
  • National City, CA
  • San Diego, CA
  • 776 Dubanski Dr, San Jose, CA 95123 (408) 227-9582
  • 4300 The Woods Dr, San Jose, CA 95136 (408) 225-5828
  • Santa Clara, CA

Publications

Us Patents

Magnetic Recording Disk Drive With Actively Controlled Electric Potential At The Head/Disk Interface For Wear And Durability Control

View page
US Patent:
7016139, Mar 21, 2006
Filed:
Oct 22, 2003
Appl. No.:
10/691752
Inventors:
Peter Michael Baumgart - San Jose CA, US
Bernhard Knigge - San Jose CA, US
Mathew Mate - San Jose CA, US
Assignee:
Hitachi GLobal Storage Netherlands B.V. - Amsterdam
International Classification:
G11B 21/02
US Classification:
360 75, 360 31, 360 25
Abstract:
An electrical potential difference between a slider body and a hard disk of a hard disk drive is eliminated based on the flying-height spacing of the slider body between the slider body and the hard disk. A predetermined bias voltage is applied between the slider body and the hard disk that includes a DC component and an AC component and that is based on the detected flying-height spacing of the slider body. The flying-height spacing can be detected based a minimum slider-to-disk clearance change from a design flying height of the slider at a frequency of the AC component as the DC component of the predetermined bias voltage is varied. Alternatively, the flying-height spacing can be detected based on a minimum electrodynamic response of the slider to a first harmonic of the AC frequency of the AC component as the DC component is varied.

Measurement Of Slider Clearance By Inducing Collision Of The Slider With Disk Surface

View page
US Patent:
7119979, Oct 10, 2006
Filed:
Jun 30, 2004
Appl. No.:
10/882882
Inventors:
Walton Fong - San Jose CA, US
Donald Ray Gillis - San Jose CA, US
Bernhard E. Knigge - San Jose CA, US
Remmelt Pit - Cupertino CA, US
Mike Suk - San Jose CA, US
Assignee:
Hitachi Global Storage Technologies Netherlands B.V. - Amsterdam
International Classification:
G11B 21/02
US Classification:
360 75
Abstract:
A method for measuring the clearance of a slider over a rotating disk by inducing a collision between the slider and the disk is described. After the normal flying height of the slider is established, the slider is driven into a collision with the rotating disk surface by applying a DC or AC voltage between the slider and the disk. The clearance data can be extracted from the induced collision by measuring a parameter, such as the change in the amplitude of the readback signal from the magnetic sensor, which is related to fly-height at the normal fly-height and at the disk surface. The two data points can then be used to derive the clearance. One embodiment uses a single beam interferometer to derive the vibrational displacement of the collision event.

Feedback Control Mechanism For Active Damping Of Slider Air Bearing Vibrations In A Hard Disk Drive Slider

View page
US Patent:
7193806, Mar 20, 2007
Filed:
Nov 29, 2005
Appl. No.:
11/289105
Inventors:
Thomas R. Albrecht - San Jose CA, US
Peter M. Baumgart - San Jose CA, US
Bernhard E. Knigge - San Jose CA, US
Assignee:
Hitachi Global Storage Technologies Netherlands B.V. - Amsterdam
International Classification:
G11B 21/02
G11B 5/596
US Classification:
360 75, 360 7703
Abstract:
In a feedback control mechanism for active damping of slider air bearing vibrations in a hard disk drive slider, a filter is used to filter a velocity signal from a slider to acquire a vibration signal. A phase-shifter, electrically coupled with the filter, shifts the phase of the vibration signal. An amplifier, electrically coupled with the phase-shifter, adjusts the amplitude of the phase-shifted vibration signal to achieve an amplitude adjusted vibration signal. An electrical coupler couples the amplitude adjusted vibration signal to the slider for actively damping air bearing vibrations in the slider.

Feedback Control Mechanism For Active Damping Of Slider Air Bearing Vibrations In A Hard Disk Drive Slider

View page
US Patent:
7215500, May 8, 2007
Filed:
Nov 29, 2005
Appl. No.:
11/289037
Inventors:
Thomas R. Albrecht - San Jose CA, US
Peter M. Baumgart - San Jose CA, US
Bernhard E. Knigge - San Jose CA, US
Assignee:
Hitachi Global Storage Technologies Netherlands B.V. - Amsterdam
International Classification:
G11B 21/02
G11B 5/596
US Classification:
360 75, 360 7703
Abstract:
In a feedback control mechanism for active damping of slider air bearing vibrations in a hard disk drive slider, an assembly is used to acquire a velocity signal from the slider. A filter, electrically coupled with the assembly, is used to filter a velocity signal to achieve a vibration signal. A phase-shifter, electrically coupled with the filter, shifts the phase of the vibration signal to achieve a phase-shifted vibration signal. An amplifier, electrically coupled with the phase-shifter, adjusts the amplitude of the phase-shifted vibration signal to achieve an amplitude adjusted vibration signal. An electrical coupler couples the amplitude adjusted vibration signal with the slider for actively damping air bearing vibrations in the slider.

Method For Actively Controlling Electric Potential At The Head/Disk Interface Of A Magnetic Recording Disk Drive

View page
US Patent:
7233451, Jun 19, 2007
Filed:
Oct 22, 2003
Appl. No.:
10/691742
Inventors:
Peter Michael Baumgart - San Jose CA, US
Bernhard Knigge - San Jose CA, US
Mathew Mate - San Jose CA, US
Assignee:
Hitachi Global Storage Technologies Netherlands B.V. - Amsterdam
International Classification:
G11B 5/02
US Classification:
360 25, 360 75, 360 69, 360 31
Abstract:
An electrical potential difference between a slider body and a hard disk of a hard disk drive is eliminated based on the flying-height spacing of the slider body between the slider body and the hard disk. A predetermined bias voltage is applied between the slider body and the hard disk that includes a DC component and an AC component and that is based on the detected flying-height spacing of the slider body. The flying-height spacing can be detected based a minimum slider-to-disk clearance change from a design flying height of the slider at a frequency of the AC component as the DC component of the predetermined bias voltage is varied. Alternatively, the flying-height spacing can be detected based on a minimum electrodynamic response of the slider to a first harmonic of the AC frequency of the AC component as the DC component is varied.

Method Of Feedback Control For Active Damping Of Slider Air Bearing Vibrations In A Hard Disk Drive Slider

View page
US Patent:
7277252, Oct 2, 2007
Filed:
Nov 29, 2005
Appl. No.:
11/289093
Inventors:
Thomas R. Albrecht - San Jose CA, US
Peter M. Baumgart - San Jose CA, US
Bernhard E. Knigge - San Jose CA, US
Assignee:
Hitachi Global Storage Technologies Netherlands B.V. - Amsterdam
International Classification:
G11B 21/02
G11B 5/596
G11B 5/55
US Classification:
360 75, 360 7703, 360 7804
Abstract:
In a method of feedback control for active damping of slider air bearing vibrations in a hard disk drive slider, a slider is isolated from ground. A slider velocity signal is filtered to acquire a vibration signal. The vibration signal is adjusted in amplitude to achieve an amplitude adjusted vibration signal. The amplitude adjusted vibration signal is applied to the slider to actively dampen air bearing vibrations in the slider.

Disk Drive With Localized Clearance And Contact Potential Measurement Capability

View page
US Patent:
7286314, Oct 23, 2007
Filed:
Jun 15, 2005
Appl. No.:
11/153186
Inventors:
Peter Michael Baumgart - San Jose CA, US
Maik Duwensee - Del Mar CA, US
Bernhard E. Knigge - San Jose CA, US
Assignee:
Hitachi Global Storage Technologies Netherlands, B.V. - Amsterdam
International Classification:
G11B 21/02
G11B 27/36
G11B 5/596
US Classification:
360 75, 360 31
Abstract:
A method and system for determining localized contact potential voltages and localized clearance data between a slider body and a hard disk of a hard disk drive. In embodiments of the present invention, a plurality of direct current (DC) pulses are applied between said slider body and a discreet location of the hard disk. In embodiments of the present invention, the discreet location of the hard disk comprises a portion of a data track of the hard disk. In embodiments of the present invention, a variation in the clearance of the slider body is determined when a given voltage is applied. Furthermore, a first set of DC pulses has a positive/negative bias while a second set of DC pulses has a negative/positive bias. The voltage of the sets of DC pulses is increased until a contact between the slider body and the hard disk is detected.

Simultaneous Measurement Of Contact Potential And Slider Body Clearance In A Magnetic Disk Drive

View page
US Patent:
7310197, Dec 18, 2007
Filed:
Jun 15, 2005
Appl. No.:
11/152912
Inventors:
Peter Michael Baumgart - San Jose CA, US
Malk Duwensee - Del Mar CA, US
Bernhard E. Knigge - San Jose CA, US
Assignee:
Hitachi Global Storage Technologies Netherlands, B.V. - Amsterdam
International Classification:
G11B 21/02
G11B 27/36
G11B 5/596
US Classification:
360 75, 360 31
Abstract:
A method for simultaneously measuring contact potential and slider body clearance in a hard disk drive. In embodiments of the present invention, a plurality of direct current (DC) pulses are applied between a slider body and a hard disk of a magnetic disk drive. The contact potential voltage between the slider body and the hard disk is determined in response to applying the plurality of direct current (DC) pulses. The voltage of the plurality of direct current (DC) pulses is increased until a contact between the slider body and the hard disk is detected.
Control profile
Bernhard Ernst Knigge from Maitland, FL, age ~54 Get Report