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7593210 |
Permanent magnet bulk degausser
One or more pairs of magnet assemblages ( 14 and 16 ) are provided with magnetized segments ( 21 - 30 ) arranged in a Halbach-like array. The magnet assemblages ( 14 and 16 ) define a gap ( 18...
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7457095 |
Demagnetizing method
A method is presented for demagnetizing ferromagnetic components in an alternating field of an externally excited electrical series resonant circuit. A supply voltage having an excitation frequency...
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7451719 |
High temperature superconducting degaussing system
A method and apparatus for degaussing a water vessel. The invention involves the use of a light-weight reduced-size degaussing system that comprises a plurality of degaussing coils arranged in a...
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7415971 |
Control circuit for an actuator
In a control circuit for at least one actuator, in particular for a capacitive actuator of an injection system of an internal combustion engine, a control current can be applied to the actuator. ...
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7324321 |
Degaussing apparatus
A degaussing apparatus having permanent magnets employing common center poles arranged to obtain a flux level gauss of twice the normal level by arranging permanent magnets to create an enhanced...
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7265925 |
Recorded data deleting device for hard disk
A recorded data eraser 1 defines therein a cavity 2 for insertion of a hard disk drive 20 in the cavity 2 and includes a coil 4 being arranged around the cavity 2 so as to encircle the...
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7196894 |
Method and a device for demagnetising objects
The method according to the invention for demagnetization is effected in two separate steps. Firstly magnetically hard locations, such as weld seams, pressure locations etc., of an object to be...
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7164569 |
Mechanism for automated permanent magnet degaussing
A bulk degaussing system for the erasure of magnetic storage media by means of permanent magnets. The bulk degaussing system includes a rotatably mounted carousel and an angular displacement means...
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7120003 |
Circuit arrangement with power factor correction, as well as a corresponding appliance
The circuit arrangement has a mains connection, a mains switch with two switching contacts, a demagnetization coil and a switch-mode power supply, which contains a driver circuit for producing a...
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7119691 |
Electronic article surveillance marker deactivator using phase control deactivation
A method and apparatus to deactivate an EAS security tag are described.
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7079345 |
Demagnetization of magnetic media for data storage device using gradually reduced magnetic field
Demagnetizing magnetic media for recording data in a data storage device includes placing the magnetic media in a magnetic field at a first strength, and gradually reducing the magnetic field to a...
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7073513 |
Superconducting magnetic control system for manipulation of particulate matter and magnetic probes in medical and industrial applications
A system and method of controlling movement of magnetic material with at least first and second high temperature superconductors at spaced locations. A plurality of solenoids are associated with...
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7064948 |
Electrical properties and uniformity of bulk degaussing coils
A degaussing system for magnetic media is provided, the system comprising an erasing head connected to an LC circuit and the erasing head including an elongated form around which a coil is wound....
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7050255 |
System and apparatus for assembly level disk erase
A disk erase apparatus for erasing information on one or more disks in a disk drive uses a high strength magnetic field to erase the disks while the disks are in the HDD assembly. The design of the...
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6965505 |
Ship degaussing system and algorithm
At a ship's magnetic silencing facility, calibration measurements are taken of onboard magnetic fields, and the off-board magnetic signature is minimized through an iterative degaussing process....
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6946962 |
Electronic article surveillance marker deactivator using inductive discharge
A method and apparatus to deactivate an EAS security tag are described.
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6760210 |
Multi-functional system for demagnetizing ferromagnetic objects
The present invention relates to demagnetizing objects in a fusion cake, objects used in vehicle construction, turbines, diesel engines and other equipment. A system of the present invention...
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6747823 |
Method of demagnetizing and transferring magnetization in a magnetic recording medium, and device thereof
A method of controlling magnetic recording in a magnetic recording medium and a control device for the same provides a symmetrical transferred signal waveform of equal magnitude with good...
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6731491 |
Bulk degausser with fixed arrays of magnet poles
A bulk degaussing apparatus and method for erasing magnetic media of various sizes. A plurality of fixed magnetic poles are predisposed around a gap for projecting magnetic flux across the gap such...
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6729277 |
Electromagnetic valve controller
An electromagnetic valve controller estimates a dead time based on predetermined parameters. A dead time for the current cycle is determined based on the estimated dead time. The controller...
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6650526 |
Demagnetizing circuit
For achieving a desired course in the demagnetizing circuit (I 1 ) and power dissipation that is as low as possible during continuous operation of a color television set, a demagnetizing circuit...
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6594099 |
Apparatus for erasing data stored on a magnetic disk
A data eraser applies a strong magnetic field to a magnetic disk while suppressing the strength of a magnetic field applied to a spindle motor. The data eraser includes an upper magnet fixer, a...
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6570727 |
Method and apparatus for erasing information from a disk within a magnetic disk drive using an externally generated magnetic field
The object of the present invention is to provide a method and apparatus configured to allow an externally generated magnetic field to simultaneously erase a portion of the information on a disk,...
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6522517 |
Method and apparatus for controlling the magnetization of current transformers and other magnetic bodies
A varying voltage is applied to a conductive winding ( 61 ) that magnetically interacts with a magnetic body ( 60 ). The varying voltage causes the voltage induced in the winding to have such...
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6313491 |
Semiconductor memory having cell including transistor and ferroelectric capacitor
An upper electrode of an FRAM capacitor is connected to a diffusion layer on the surface of a semiconductor substrate via a contact hole, second interconnecting layer, contact hole, first...
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6178081 |
Controller for electric permanent chuck
A novel control circuit for magnetizing and demagnetizing an electric permanent chuck includes a single alternating current source with a selected frequency and phase. A circuit that generates...
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6169483 |
Self-checkout/self-check-in RFID and electronics article surveillance system
A self-checkout/self-check-in and electronic article surveillance (EAS) system is provided. EAS tags and radio frequency identification (RFID) tags are connected to articles for use with the...
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6160697 |
Method and apparatus for magnetizing and demagnetizing current transformers and magnetic bodies
A method and apparatus for establishing and maintaining a preferred induction level in a magnetic body. A varying voltage is applied to a conductive winding (61) that magnetically interacts with a...
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6144544 |
Apparatus and method for material treatment using a magnetic field
A method and apparatus for treating an object includes generating a magnetic field wherein at least some of the magnetic field is characterized by changes in amplitude of the magnetic field from an...
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6084514 |
Apparatus for deactivation of electronic article surveillance tags
An apparatus for deactivating a surveillance tag comprising a first coil located in a first plane, a second coil located in a second plane, and a third coil located in a third plane such that the...
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6060988 |
EAS marker deactivation device having core-wound energized coils
A device for deactivating a magnetomechanical EAS marker includes a coil and circuitry for energizing the coil to generate an alternating magnetic field. The coil is wound around a magnetic core....
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6038093 |
Magnetic recording/reproducing apparatus with a current supplying circuit for demagnetizing residual magnetization remaining at an end of a magnetic pole
There is provided a magnetic recording/reproducing apparatus which has an improved reliability for a reproduced signal by eliminating a deformation in a reproduced signal waveform due to a residual...
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5995358 |
Demagnetizable electropermanent magnetic holder
A holder having at least one magnetizable body surrounded by a coil is demagnetized by passing through the coil a succession of groups of pulses. The pulses of each group are of the same polarity...
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5991147 |
Electromagnetic chuck with magnetizing/demagnetizing circuit
An improved electromagnetic chuck which does not require a continuous direct current supply while being magnetized, including a main body defining a plurality of recesses and forming a cover, which...
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5986406 |
Electric field noise eliminating circuit in a video display appliance
The present invention relates to a circuit for eliminating radiated electric field noise in a video appliance which can completely offset radiated electric field noise generated on the front face...
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5969933 |
Transient magnet field degaussing system
A means for winding orthogonal coil systems that almost completely encompass and closely conform to magnetic media having a circular cylindrical form and orientation, including such media further...
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5953196 |
Method and apparatus for an electromagnetic joystick lock with flux canceling driver circuit
The locking force of an electromagnetic joystick lock with flux having a flux canceling driver circuit is controlled in order to maintain the control lever of a joystick in a desired position. In...
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5952787 |
Degaussing circuit employing filter for improved performance
A degaussing circuit is adapted to overcome a problem with limitations in the design of a printed circuit board under the safety regulations. The degaussing circuit is realized by making use of the...
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5907465 |
Circuit for energizing EAS marker deactivation device with DC pulses of alternating polarity
A device for deactivating magnetomechanical EAS markers includes a storage capacitor and a coil for generating a deactivation field. A bridge arrangement of four switches interconnects the coil...
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5870269 |
Demagnetizing circuit
A demagnetizing circuit has a positive characteristic thermistor and a demagnetizing coil connected in series with an alternating current power supply and is so constructed that it is possible to...
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5825604 |
Demagnetization circuit
In one example of a demagnetization (degaussing) circuit, main electrodes of a TRIAC, a first positive temperature characteristic thermistor and a demagnetization coil are connected in series to...
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5815361 |
Magnetic field shielding device in display
A magnetic field shielding device of a CRT (cathode ray tube) display includes a degaussing coil for preventing a magnetic field, generated by a voltage supplied to a deflection coil of the...
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5798902 |
Linearity signal coupler
A method for improving the linearity of a signal coupling device having a ferrite core transformer comprises the step of demagnetizing the ferrite core. The resulting signal coupler has...
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5781111 |
Apparatus for deactivation of electronic article surveillance tags
In accordance with the present invention there is provided an apparatus for deactivating electronic article surveillance tags comprising a deactivation coil, a capacitor, charging means for...
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5721665 |
Modulated magnet field bulk degaussing system
A bulk degaussing system for bulk erasure of various magnetic media includes a source of magnetic flux for generating a magnetic field with a predetermined field strength within a predetermined...
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5715130 |
Demagnetization circuit and components therefor
A demagnetization circuit controls a demagnetization current to its demagnetization coil by means of a PTC thermistor with positive characteristic. The PTC thermistor is connected in series with...
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5574616 |
Degaussing technique
To degauss cassettes of magnetic tape, a magnetic field is applied to the magnetic material while the magnetic material moves with respect to the field in a single air gap of a flux density of at...
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5570023 |
Portable station for measuring and adjusting the magnetic signature of a naval ship
The invention relates to a portable station for measuring and adjusting the magnetic signature of a naval ship making it possible to determine and/or modify the characteristics of the currents...
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5557493 |
Method of adjusting linearity
A linear permanent magnet position sensor is produced by a novel permanent magnet demagnetization process. Demagnetization field strength is controlled to demagnetize a thinner portion of the...
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5526221 |
Degaussing circuit
A degaussing circuit comprising a rectifying circuit for rectifying an AC voltage inputted therein into a DC voltage, a capacitor for smoothing the DC voltage from the rectifying circuit, a RC...
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