Abstract: 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. The coil has two segments which are spaced apart a distance to provide adjustment of the electrical and/or magnetic properties of the coil.

Abstract: 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 head disk enclosure provides a reduced thickness in a localized region over the disks. This allows a narrower working magnetic gap of the HDD level disk erase apparatus. The localized region of the HDD may be a formed indentation on the top cover, elimination of flange, and reduced floor thickness of the HDD base.

Abstract: 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. Current data associated with the signature minimization is retained by a processor-controller implemented, along with degaussing coils and other apparatus, in a CLDG system effectuated onboard in a manner continually adaptive to changing conditions while voyaging. According to the CLDG methodology: Real time measurements are taken of the onboard magnetic fields, and are modified to account for the degaussing coils' magnetic effects. Via least squares fit mathematics, scale factors are calculated based on the relationship between (i) the real time measurements (as modified) of the onboard magnetic fields and (ii) the calibration measurements of the onboard magnetic fields.

Abstract: A method and apparatus to deactivate an EAS security tag are described.

Abstract: 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. The coil has two segments which are spaced apart a distance to provide adjustment of the electrical and/or magnetic properties of the coil.

Abstract: 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 comprises four rectilinear working conductors in the shape of busbars which are assembled in pairs on each lateral side of the object to be treated over the whole length thereof, wherein said busbars are arranged one above the other at a distance determined by the object height. The system also comprises power supply modules and side working modules supporting the working busbars. Unipolar generator can be used for power supply. The side modules can be transformed to enable processing of objects having various widths, heights and lengths. The system can be transported over land, and, when the module bodies are made water-tight, it can be used for processing floating objects and transported by sea.

Abstract: 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 reproducibility and performs magnetic transfer with high reliability. In performing initial magnetization prior to performing transfer magnetization, an AC magnetic field, the polarity of which changes in the perpendicular direction Y (or both in the perpendicular direction Y and parallel direction X), is applied to the recording surface of the magnetic recording layer of a magnetic recording medium, and the intensity of the AC magnetic field is gradually decreased with time, to demagnetize the entire magnetic recording layer.

Abstract: 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 measures a dead time in the previous cycle. The controller determines a deviation between the dead time measured in the previous cycle and the dead time estimated in the previous cycle. The deviation is added to the dead time estimated in the current cycle to determine the dead time for the current cycle. The controller further determines a target de-energization timing indicating when to execute a valve timing command. The dead time determined for the current cycle is offset or subtracted from the target de-energization timing to determine an actual de-energization timing. An electromagnet of the valve is de-energized in accordance with the actual de-energization timing.

Abstract: 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 that the spacing of the poles is provided at roughly equal intervals or sets of intervals across the gap to form sets of magnetic fields at the staggered intervals. A media passage is provided such that across the width of the passage at every point, media passing therethrough is linearly exposed to the magnetic fields provided through the gap. An adapter constrains location of the media passing through the gap by way of the media passage such that the plurality of magnetic poles effectively degausses regions formed between the poles. Placement of the magnetic poles is provided with partial overlap of facing poles on opposite sides of the pathway of the media passage. Two or more multi-pole degaussing regions provided with differing orientation avoid regional weaknesses or singularities in the magnetic field.

Abstract: For achieving a desired course in the demagnetizing circuit (I1) and power dissipation that is as low as possible during continuous operation of a color television set, a demagnetizing circuit for controlling the demagnetizing current (I1) includes two transistors (T1, T2) that are controlled via a common or via two separate capacitive voltage dividers (C1-C4). A rectified alternating voltage is applied to the capacitive voltage dividers (C1-C4). The demagnetizing current (I1) controlled by the transistors (T1, T2) is supplied to a demagnetizing coil (R4).

Abstract: 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 lower magnet fixer, and a linkage. The upper magnet fixer fixes one set of permanent magnets and the lower magnet fixer fixes another set of permanent magnets. The plate members are provided at the tips of the upper and lower magnet fixers. The plate members are made of a soft magnetic material, for example, JIS SS400, respectively. Each of these plate members functions as a yoke.

Abstract: 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, or a plurality of disks, within a magnetic storage device. The invention allows high throughput of erased magnetic storage devices, as in a mass production environment. Additionally, the invention allows a variety of magnetic storage device configurations in that the erasing is non-intrusive to the housing of the magnetic storage device and does not depend on the number of disks within the magnetic storage device.

Abstract: 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 that the spacing of the poles is provided at roughly equal intervals or sets of intervals across the gap to form sets of magnetic fields at the staggered intervals. A media passage is provided such that across the width of the passage at every point, media passing therethrough is linearly exposed to the magnetic fields provided through the gap. An adapter constrains location of the media passing through the gap by way of the media passage such that the plurality of magnetic poles effectively degausses regions formed between the poles. Placement of the magnetic poles is provided with partial overlap of facing poles on opposite sides of the pathway of the media passage. Two or more multi-pole degaussing regions provided with differing orientation avoid regional weaknesses or singularities in the magnetic field.

Abstract: 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 waveform and magnitude that the integral over time of the induced voltage correlates to desired changes of the induction level (magnetic flux density). The induction level of a magnetic body may be controlled to transition from an initial induction level to a preferred induction level, to maintain a preferred induction level, to reduce fluctuations around a preferred induction level, or to vary with time in a preferred manner. The invention is especially applicable to ordinary current transformers, which may be demagnetized automatically while remaining in service. Once demagnetized, ordinary current transformers are able to accurately sense nonsymmetrical currents, including d-c currents and a-c currents that have d-c components.

Abstract: 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 interconnecting layer, and contact hole. The first interconnecting layer is formed at substantially the same level as the FRAM capacitor. This decreases the depth of the contact hole connecting the first interconnecting layer to the surface of the semiconductor substrate and thereby decreases the aspect ratio of this contact hole. This facilitates processing and filling this contact hole and allows micropatterning.

Abstract: For achieving a desired course in the demagnetizing circuit (I1) and power dissipation that is as low as possible during continuous operation of a color television set, a demagnetizing circuit for controlling the demagnetizing current (I1) includes two transistors (T1, T2) that are controlled via a common or via two separate capacitive voltage dividers (C1-C4). A rectified alternating voltage is applied to the capacitive voltage dividers (C1-C4). The demagnetizing current (I1) controlled by the transistors (T1, T2) is supplied to a demagnetizing coil (R4).

Abstract: A smart card interface device which can be installed in an expansion slot of a handheld device comprises: a host interface unit for connecting with I/O ports included in the expansion slot of the handheld device so as to receive/send serial communication data signals and clock signals from/to said I/O ports; a first smart card connector provided at a surface of said smart card interface device, for electrically connecting with a smart card of the first type; a first smart card interface unit for detecting whether a smart card of the first type has been connected to said first smart card connector and for driving the smart card of the first type being connected; a protocol implementation unit for controlling each component of said smart card interface device so as to implement communication protocols between said smart card interface device and said handheld device as well as between said smart card interface device and said smart card of the first type.

Abstract: 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 electrical pulses is coupled to the alternating current source to produce pulses at a multiple of the frequency of the alternating current source. The pulse generating circuitry also sets the phase of the pulses relative to the phase of the alternating current source at a predetermined value. The pulses are then applied to the gates of one or more silicon controlled rectifiers (“SCRs”) which control current flow through the electric permanent chuck. By adjusting the phase of the electrical pulses, the amount of current and average DC voltage applied to a coil of the electric permanent chuck through an SCR can be controlled.

Abstract: 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 invention. A preferred embodiment for self-checkout includes a housing having a cavity for receiving articles for self-checkout. The cavity is disposed within a deactivation zone. The RFID tags are read, and after verification of an authorized transaction, a deactivation antenna is energized to deactivate the EAS tags, and a stored inventory database is updated. Information about the transaction can be displayed. A preferred embodiment for self-check-in includes an elongated housing into which articles are deposited for return. Once deposited, the articles pass through the housing and out the other end.

Abstract: 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 magnetic body (60). The voltage is controlled during a first phase in such a way that the magnetic induction level of the magnetic body is changed from an unknown induction level to a known induction level. During a second phase, the induced voltage across the winding is controlled so that the induction level is changed from the known induction level to the preferred induction level. An optional third phase may be utilized, during which the average value of induced voltage is kept near zero in order to keep the induction level near the preferred induction level. The invention is especially applicable to ordinary current transformers, which may be demagnetized automatically while remaining in service.

Abstract: 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 average non-zero value of the magnetic field. The object is placed in the influence of the magnetic field for a sufficient time to subject the object to the changes in amplitude of the magnetic field. A method and apparatus for determining a preferred field intensity of the magnetic field is also included.

Abstract: 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 third plane intersects the first and second planes at an angle that is greater than zero degrees and less than ninety degrees.

Abstract: 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. The core may be cruciform with four arms, on each of which a respective coil is provided. Alternatively, the core may be generally square and planar, with two coils wound around the core in different respective directions.

Abstract: 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 magnetization generated in a magnetic head. The magnetic recording/reproducing apparatus has a magnetic recording medium including a magnetic film to which information is magnetically recorded and a thin-film magnetic head including a magnetic pole and a coil provided around the magnetic pole. A current supplying circuit supplies a current to the coil so that a magnetic state of the magnetic pole is stabilized. The current is supplied to the coil after a recording operation has been completed by the thin-film magnetic head. The current may demagnetize the magnetic pole of the magnetic head, or stabilize the magnetic state of the magnetic pole.

Abstract: 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 and the polarity of each group of pulses is opposite that of the preceding group while the current of the pulses of each group is less than that of the pulses of the preceding group. Each group has 2 to 8 identical pulses and the pulses are formed by clipping an incoming alternating-current line voltage.

Abstract: 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 includes a plurality of magnetically conductive portions and non-magnetically conductive portions alternately arranged, a plurality of magnetic units arranged within said plurality of recesses, and a magnetizing/demagnetizing circuit for magnetizing/demagnetizing said plurality of magnetic units, is provided. The magnetizing/demagnetizing circuit includes a magnetizing circuit, a demagnetizing circuit and an output circuit, by which a direct current is generated to magnetize the electromagnetic chuck, or a pair of positive and negative phase pulses with a gradually increased frequency is generated to quickly demagnetize the electromagnetic chuck.

Abstract: 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 of the CRT by variably adjusting and applying the waveform signal, the amplitude and phase of which are opposite to those of the radiated electric field noise formed on the front face of the CRT. The circuit for eliminating radiated electric field noise according to the present invention includes a high voltage ripple offset section including a cylindrical core, wherein a high voltage lead wire of the FBT passes through the cylindrical core, for eliminating a ripple component of the high voltage applied to the anode of the CRT according to the negative polarity pulse signal from the FBT induction coil, and an electric field noise offset section operable to offset the radiated electric field noise generated from the front face of the CRT by applying the negative polarity pulse signal to the periphery of the CRT.

Abstract: 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 encased in square or rectangular cassettes, cartridges or disk drives, while providing necessary access to that volume without the use of drawers and separable connectors or flexible lead wires for connection of the coils to energy stored in capacitors. The invention further employs hard wired circuitry for controlling the phase of currents in the coils and maintaining the desired rotation of the magnetic field. While this invention can be realized to degauss media inserted and extracted through the same side of the winding system, it is equally configurable to conveyance of media in one end of an orthogonal coil system and out of the opposing end.

Abstract: 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 one embodiment, the locking force may be in either an activated or deactivated state, and one of a forward or reverse current is applied to the coils of the lock in response to the state, in order to eliminate the residual magnetism when the locking force is deactivated.

Abstract: 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 horizontal deflection wave generated by a horizontal deflection circuit, and includes: a degaussing control section for detecting a horizontal frequency from the horizontal deflection wave received from the horizontal deflection circuit; and a degaussing coil for eliminating the earth magnetic field caused by a DC component from the horizontal frequency received from the degaussing control section.

Abstract: 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 with the storage capacitor and with circuit ground. The switches are controlled to apply a train of DC pulses to the coil such that the pulses have alternating polarities and decreasing amplitudes.

Abstract: 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 suppress the production of a low-frequency electromagnetic field. After the completion of a demagnetizing operation, the demagnetizing coil and the alternating current power supply can be completely isolated from each other, i.e. both ends of the demagnetizing coil can be electrically cut off from the alternating current power supply, so that it is impossible for residual demagnetizing current from the alternating current power supply to produce a low-frequency electromagnetic field in the demagnetizing coil. Also, preferably, at least one end of the demagnetizing coil is kept at a reference potential by way of a capacitor to dissipate any currents which may be induced in the demagnetizing coil by any influence other than the alternating current power supply.

Abstract: 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 both ends of an AC supply, and a heat-sensitive switch and a heating resistor are connected in series between an end of the TRIAC on the side of the AC supply and an end of the demagnetization coil on the side of the AC supply. A connecting point between the heat-sensitive switch and the heating resistor is connected to a gate electrode of the TRIAC, and the heat-sensitive switch and the heating resistor are thermally coupled to each other. The disclosed demagnetization circuit does not need a secondary electric circuit such as a relay control circuit and allows easy substrate design, with a small number of components and at low cost.

Abstract: 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 display, from being emitted from the display. A tilt coil maybe disposed at the middle portion of the degaussing coil so as to surround an electron gun of the cathode ray tube. The top and bottom portions of the degaussing coil are arranged so as to be horizontal. Both sides of the middle portion of the degaussing coil are bent inward so as to approach to each other, and so as to have a predetermined distance therebetween. The shielding device prevents dark color purity from being generated at the lower portion of the display.

Abstract: 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 substantially zero remanent magnetism.

Abstract: 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 charging the capacitor to a predetermined level, and an electronic switch connected to the capacitor and the deactivation coil so that when the switch is open the capacitor can be charged by the charging means and when the switch is closed the capacitor can discharge through the deactivation coil.

Abstract: 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 volume defining a predetermined degaussing window, a transport system for transporting the magnetic media relative to the degaussing window such that every point on the magnetic media is exposed to the magnetic field. A control circuit is included which modulates the magnetic field to reduce power consumption. In addition to reducing power consumption, the modulated magnetic field minimizes system performance degradation due to stalls of the magnetic media transport system due to interactions between the magnetic field and ferromagnetic components associated with certain magnetic media.

Abstract: 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 and thermally coupled to a heat-sensitive switch. An NTC thermistor with negative characteristic for suppressing rush current of the voltage source is also thermally coupled to the heat-sensitive switch. After a power switch is closed, the heat-sensitive switch is opened by the heat emitted from the PTC thermistor and remains open by the heat from the NTC thermistor. The two thermistors and the heat-sensitive switch are contained in a case for easy handling and to make the component compact.

Abstract: 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 least 1,000 gauss and at an angle between 20 degrees and 70 degrees from the horizontal of the magnetic tape for a time priod of at least one second and the field is alternated at a frequency of at least ten hertz. The magnetic material may be rotated while it is in the field.

Abstract: 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 flowing in the magnetic immunization loops with which this naval ship (1) is furnished. The station is of the type including several magnetic sensors (4) capable of being laid on the bottom of the sea, the magnetic sensors (4) being connected to a device (13) for relaying the data which they provide, and the said naval ship (1) being equipped with a device (14) for receiving the said data, and is characterized in that the magnetic sensors (4) are connected together so as to form a deformable string (2) capable of being laid on the bottom of the sea.

Abstract: 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 permanent magnet less than, equally, or greater than a thicker portion of the same permanent magnet. Linearity and stability are both tailored through a single demagnetization step.

Abstract: 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 charging circuit for charging with the DC voltage smoothed by the capacitor, a positive temperature coefficient resistor having a resistance which is increased with an increase in a temperature due to an AC current flowing therethrough upon power supply, a degaussing coil for removing a magnetic field in response to the AC current flowing through the positive temperature coefficient resistor thereto, a relay for controlling the flow of the AC current through the positive temperature coefficient resistor to the degaussing coil, and a relay driving circuit for controlling an ON/OFF state of the relay in response to the voltage charged on the RC charging circuit.

Abstract: A marker for use in a magnetomechanical electronic article surveillance (EAS) system is made by mounting a magnetostrictive element in a housing adjacent to a biasing element that is magnetized to a degree of magnetization that is less than saturation. The resonant frequency of the marker is detected. If the detected resonant frequency does not match a predetermined operating frequency of the EAS system, the degree of magnetization of the biasing element is adjusted so as to tune the resonant frequency of the marker to the predetermined operating frequency.

Abstract: A deactivator for deactivating electronic article surveillance tags includes a deactivating coil, drive circuitry controllable for supplying driving signals to the deactivating coil, a reference signal generator for generating a reference signal having preselected characteristics varying with time, a comparator for comparing characteristics of the driving signals with the reference signal characteristics, and a control unit for controlling the drive circuitry in accordance with signal comparisons effected by the comparator.

Abstract: A device for determining the orientation of a vehicle includes a magnetic field sensor (3) which is arranged in the vicinity of a ferromagnetic outer wall of the body of the vehicle and which is rigidly connected to the wall. External magnetic fields could unpredictably magnetize the wall portion (1) of the body, in the vicinity of which the magnetic field sensor (3) is provided, so that the measurements would become inaccurate. In order to achieve a substantial reduction of these adverse effects of external magnetic fields, the relevant wall portion is magnetically stabilized, preferably by including it in a magnetic circuit which also includes at least a magnet (11; 23, 27).

Abstract: The static magnetic field signature of a sea-going vessel is reduced by sly of degaussing current to pairs of loop coils adjacent to the port and starboard sides of the vessel hull. The coils of each pair are positioned at equal angles to a vertical plane extending longitudinally along the keel of the hull. The degaussing currents in the respective coils of each pair are simultaneously varied with respect to amplitude and polarity in accordance with geometrical heading of the vessel and changes in its roll and pitch orientations.

Abstract: A system and method are provided for degaussing a vessel moving over an urwater magnetic detector. A location at the vessel residing over the magnetic detector is continuously provided to a controller. The vessel is equipped with a plurality of degaussing coils such that each is independently controllable. Degaussing coil currents are determined by the controller according to a least squares minimization routine such that an off-board magnetic field of the vessel at the location over the magnetic detector is absolute zero. In addition, the determined coil currents minimize the off-board magnetic field of the vessel at all other locations. The determined coil currents are then applied to the appropriate degaussing coils via separate power supplies.

Abstract: To degauss cassettes of magnetic tape, a magnetic field is applied to the magnetic material with a flux density of at least 1,000 gauss and at an angle between 20 degrees and 70 degrees from the horizontal of the magnetic tape for a time period of at least one second and the field is alternated at a frequency of at least ten hertz. The magnetic material may be rotated while it is in the field.

Abstract: A method and apparatus for conditioning a magnetic read/write head to substantially eliminate read-back pulse distortions associated with unfavorable magnetic domain patterns in the head stores the polarity of the last write current pulse of a write pulse train applied to the head-coils. This polarity is compared to a pre-determined reset current pulse polarity. If the last write current polarity is opposite to the reset current polarity, then a reset pulse, or a series of pulses, having the pre-determined reset polarity is applied to the head prior to performing a read operation with the head. The pre-determined reset polarity corresponds to the polarity that resets the head to the magnetic domain state most preferred for reading due to reduction of read-back distortion. The reset pulse, or pulse train, according to the present invention is of constant polarity. If the last write current pulse polarity is the same as the reset polarity, then no reset pulse is applied to the head.

Abstract: A semiconductor memory device having stacked-capacitor type memory cells, each of which contains an MOS transistor and a storage capacitor. The capacitor has a first opposed electrode having a recess at its upper face, which is formed through an inter-layer insulation film on the substrate, a first insulation film which covers a surface of the first opposed electrode, a charge storage electrode formed in the recess of the first opposed electrode and contacted with the source region of the transistor through a contact hole of the inter-layer insulation film, a second insulation film which covers a surface of the charge storage electrode, and a second opposed electrode formed on the second insulation film. The charge storage electrodes do not broken in the fabrication sequence of the device. Even if the charge storage electrodes are sheered off in positioning to the corresponding contact holes, the inter-layer insulation film is disadvantageously etched.