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7379287 |
Shielding method and shielding apparatus
A canceling exciting coil is supported by a coil supporting member of electrically insulating material fitted to an arch core. A canceling current Ic of opposite phase to a main current I flowing...
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7345865 |
Magnetic guiding apparatus
A magnetic guiding apparatus guides a moving member by attracting a target with electromagnets provided on the moving member. The magnetic guiding apparatus has a magnetic-flux detection device...
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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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7176388 |
Soldering method and solder joint member
In a soldering method for soldering an electronic component including a palladium or palladium alloy layer formed on a surface of the electronic component and also including a soldering lead...
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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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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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7061742 |
Desk-top continuous-use magnetic media eraser/degausser
A manually operated continuous-use desk-top magnetic media eraser/degausser that utilizes elaborately shielded state-of-the-art Rare Earth Magnets to uniformly remove magnetically recorded...
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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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6316845 |
Battery powered AC electromagnetic yoke for magnetic particle inspection
A portable, battery-operated AC electromagnetic yoke for detecting surface defects in ferrous materials by employing an AC magnetic field. The yoke includes a circuit that produces a quasi AC...
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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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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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6058078 |
Information recording disc demagnetization apparatus
An information recording disc demagnetization apparatus according to the present invention demagnetizes information recording discs whose information is read by irradiating a laser beam, such as a...
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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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5986355 |
Arrangement and method for reduction of magnetic fields and use thereof
The present invention relates to an arrangement for reduction of magnetic alternating fields for example in a vehicle or similar which comprises at least one electrical system which comprises at...
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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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5959824 |
Transient magnetic field degaussing system with auto calibration
A bulk degaussing system automatically adjusts the operating voltage of the system to achieve a predetermined level of magnetic filed strength. A microprocessor is used to monitor the transient...
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5923520 |
Demagnetizing circuit and current limiting device
A demagnetizing circuit and a current limiting device for being built into a power supply circuit of a color television receiver or color monitor display or the like with which it is possible to...
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5901029 |
Method of degaussing a color cathode ray tube
In a method of testing a color cathode ray tube, an electron gun assembly is energized to emit electron beams and only a horizontal deflection magnetic field is applied to the electron beams so...
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5889338 |
Demagnetizing apparatus for an automotive engine
An automotive internal combustion engine demagnetizer that can improve engine performance by reducing the magnetic drag associated with the operation of the engine. By demagnetizing the engine...
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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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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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5666413 |
Scrambler of information stored on magnetic memory media
A device for scrambling the information held by magnetic memory storage media and rendering the information inaccessible. The portable device provides a passage through which a magnetic memory...
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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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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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5420742 |
Degausser for tape with plural recorded segments
This method produces a tape having a plurality of recorded segments separated by cue tones and having a reduced tendency to generate false cue tones. The method includes applying a layer of a...
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5357398 |
Degaussing circuit
A degaussing circuit has a degaussing coil, an oscillator, amplifiers, a bias source, a capacitor, a switch and a time period controller. The oscillator supplies high frequency alternating currents...
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5270899 |
Erasing apparatus
An apparatus for erasing information recorded on a magnetic tape wound into a roll having a diameter. The apparatus comprises an erasing coil wound in the form of a solenoid defining a space...
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5189590 |
Closed-loop multi-sensor control system and method
A closed-loop multi-sensor control system for controlling ship signatures positions away from local sensors used to direct local signatures controllers by controlling a field variable signature...
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5185688 |
Split core degaussing coil loop
A split core degaussing coil loop having a segmented and disassembled loop portion that is joined together to include an object to be demagnetized, in situ, as part of the assembled core loop and...
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5181058 |
Camera having magnetic head for demagnetizing and recording in demagnetization pattern
A camera arranged to use a film having a magnetic storage part comprises a magnetic head which is arranged to demagnetize a signal pattern previously recorded in the magnetic storage part of the...
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5170094 |
Magnetic field compensation apparatus
A compensating coil for a scanning electron beam display such as a color television tube reduces undesirable deflection of the electron beams due to ambient magnetic fields, in particular the...
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5151843 |
Sensitizer for ferromagnetic markers used with electromagnetic article surveillance systems
An apparatus for use with magnetically based electronic article surveillance systems employing certain types of markers includes a hollow core having a gap in its perimeter, a coil of wire wrapped...
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5126669 |
Precision measurement of magnetic characteristics of an article with nullification of external magnetic fields
Apparatus for characterizing the magnetic field of a device under test includes a device for nullifying the ambient magnetic field in a test environment area with a constant applied magnetic field,...
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5053893 |
Method of and device for demagnetizing magnetic recording medium
A magnetic recording medium such as a magnetic recording tape or disk is demagnetized by applying a saturating magnetic field to the magnetic recording medium, then applying an unsaturating...
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4970621 |
Demagnetization of thin film magnetic recording transducers utilizing a decreasing AC current
Noise in the readback signal of a magnetic recording device resulting from spurious pulses in the readback signal produced by transitions of the magnetic remanent state of the yoke in the...
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4887184 |
Demagnetizer
Auto transformer supplying current to the object to be demagnetized (chuck), this current controlled by an ON set of transformers, and a DEMAG set of transformers. Each set includes a pair of...
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4873605 |
Magnetic treatment of ferromagnetic materials
A device for treatment of ferromagnetic materials comprising means for developing a magnetic field of a selected intensity, duration, and cycle, which field is passed through materials to be...
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4829397 |
Apparatus for demagnetizing parts
An apparatus for demagnetizing parts after they have been subjected to the action of a magnetic field having coils (1,2) connected to an a-c power supply source and disposed one inside the other at...
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4816965 |
Mechanism for providing pulsed magnetic field
A mechanically driven linkage causes a magnetic field acting on the object to be pulsed by alternately permitting and preventing a magnetic field from acting on the object during selected periods...
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4734620 |
Resonant degaussing apparatus
First and second capacitors are charged prior to a degaussing interval. A first switch couples the first capacitor to a degaussing coil to initiate the degaussing interval. The first capacitor and...
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4621299 |
High energy degausser
A magnetic material degausser in which the material to be degaussed is placed within the center of a degaussing coil. A capacitive discharge system is employed for energizing the degaussing coil....
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4617603 |
Degaussing system for bulk demagnetization of previously magnetized materials
The item to be demagnetized is placed in a chamber surrounded by electrical windings defining a pair of coils that are disposed in a mutually orthogonal configuration. Currents for the two coils...
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4471403 |
Biasing and fast degaussing circuit for magnetic materials
A dual-function circuit is provided which may be used to both magnetically bias and alternately, quickly degauss a magnetic device. The circuit may be magnetically coupled or directly connected...
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