WO2006068098A1 - データ消去確認インジケータ、記録媒体処理箱及びデータ消去方法 - Google Patents
データ消去確認インジケータ、記録媒体処理箱及びデータ消去方法 Download PDFInfo
- Publication number
- WO2006068098A1 WO2006068098A1 PCT/JP2005/023283 JP2005023283W WO2006068098A1 WO 2006068098 A1 WO2006068098 A1 WO 2006068098A1 JP 2005023283 W JP2005023283 W JP 2005023283W WO 2006068098 A1 WO2006068098 A1 WO 2006068098A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- data
- magnetic
- magnetic field
- confirmation indicator
- recording medium
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/02—Recording, reproducing, or erasing methods; Read, write or erase circuits therefor
- G11B5/024—Erasing
- G11B5/0245—Bulk erasing
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
- G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
- G11B11/105—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
- G11B11/10502—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing characterised by the transducing operation to be executed
- G11B11/10526—Bulk initialisation or erasing, e.g. at least one whole information track with a single action
Definitions
- the present invention is used when erasing recorded data from a magnetic recording medium such as a hard disk drive, floppy disk (registered trademark), and video tape, and a recording medium that employs a magnetic recording method such as MO. This is related to the data erasure confirmation indicator.
- the hard disk device built in the computer even if the magnetic disk is initialized (physical format and logical format) by the OS (Operation System), the location information of the recorded data (FAT: File Allocation Table) etc.
- the magnetic data recorded on the magnetic disk itself is not erased. For this reason, when reusing or destroying a computer, in order to prevent others from reading the magnetic data, it is impossible to restore the magnetic data using data erasure software or the hard disk device itself. Security measures such as mechanical destruction are taken.
- Patent Document 1 discloses a recorded data erasing apparatus that disturbs magnetic data recorded on a magnetic disk by applying a magnetic field from the outside of the hard disk device and makes it impossible to restore the recorded magnetic data. ing.
- recorded magnetic data can be erased in a short time only by inserting a hard disk device and performing a data erasing operation. Therefore, discard the node disk device from which data has been erased. It is also possible to reuse it by attaching it to the computer again.
- Patent Document 1 Japanese Utility Model Registration No. 3088608
- the data erasing device described above generates a strong magnetic field, and the recording medium is placed in the magnetic field to erase the recorded data. Further, since the recording medium itself is not destroyed, the recording medium can be reused.
- the practitioner may have doubts about the credibility of data erasure. That is, the above-described measures destroy data by exposing the recording medium to a strong magnetic field, and there is no change in the appearance of the recording medium. Even if it is exposed to a strong magnetic field, the magnetic field itself cannot be visually observed. That is, when the data erasing operation is performed by the data erasing apparatus described above, the appearance of the recording medium does not change before and after that, and the erasing process cannot be visually confirmed.
- the present invention aims to solve the above-mentioned questions and anxieties of the prior art, and proposes an indicator that can infer that data has been erased. Means for solving the problem
- An aspect of the present invention for solving the above problems is that a data erasure confirmation indicator placed in a magnetic field together with a recording medium when the recording medium is placed in a magnetic field in order to erase data recorded on the recording medium.
- the data erasure confirmation indicator has a display unit and changes a display state of the display unit when placed in a magnetic field having a predetermined intensity or more.
- the data erasure confirmation indicator of the present invention is used by being inserted into a data erasure apparatus that generates a magnetic field together with a recording medium to be erased. That is, the indicator of the present invention is in the vicinity of the recording medium to be erased during the data erasing operation.
- the data erasure confirmation indicator of the present invention When the data erasure confirmation indicator of the present invention is placed in a magnetic field of a predetermined strength or higher, the display state of the display section changes. It can be seen that the indicator has been exposed to a magnetic field. As described above, since the indicator of the present invention is placed near the recording medium, if the indicator display changes and it is proved that the indicator is exposed to a magnetic field, Therefore, it is assumed that the recording medium was exposed to a corresponding magnetic field, and that the data was further destroyed.
- the change in the display state of the display unit is the following, or a combination of deviations! /.
- the display unit includes a magnetic layer and a magnetic particle, and the magnetic particle allows the magnetic particle to freely move in at least a part of the layer. It is preferable to have a layer and to visually recognize the arrangement state of the magnetic particles from the outside.
- the data erasure confirmation indicator of the present invention can display characters and figures with a predetermined magnetic head. That is, the magnetic layer is magnetized in a predetermined pattern by the magnetic head. For example, the magnetic layer is magnetized so that the magnetized range is linear and the line draws a predetermined number or character.
- the data erasure confirmation indicator of the present invention has a magnetic particle layer in which magnetic particles are freely moved, so that the magnetic particles are arranged along a magnetized line and express predetermined numbers and letters.
- the data erasure confirmation indicator of the present invention when placed in a magnetic field having a predetermined strength, the magnetization pattern drawn on the magnetic layer is destroyed and the original characters and the like are lost.
- the range in which the magnetic particles can move freely may be a part of the layer, but the magnetic particles U, who can move freely throughout the qualitative area.
- the data erasure confirmation indicator has a hollow portion that is covered with a transparent layer to form a closed space, and magnetic particles are enclosed in the hollow portion, and the magnetic particles can move freely throughout the hollow portion. It is.
- the magnetic particle layer has a plurality of microcapsules, and in each microcapsule, the magnetic particle is enclosed so as to be movable only within the microcapsule. Even if it is the structure which is,
- the display unit may be one in which a large number of microcapsules dispersed in a synthetic resin are arranged on a magnetic layer and formed into a plate shape.
- the microcapsule may have a structure in which a liquid and magnetic particles floating in the liquid and sensitive to a magnetic field are enclosed.
- the magnetic layer may be capable of drawing a desired character or graphic pattern by the magnetized portion if the specific portion is magnetized.
- the magnetic layer may be one in which a specific part is magnetized, and letters and graphic patterns are drawn by the magnetized part! /.
- the former indicator that is, an indicator that has not been magnetized yet
- a user can draw a character or a graphic pattern according to his / her intended purpose by using a magnetic key.
- the user selects and uses an indicator in which a character or a graphic pattern is already drawn by the magnet according to the purpose of use. Can be handled easily by the user.
- such a data erasure confirmation indicator is one in which the magnetic layer is magnetized with a magnetic force that is about 30% to 50% weaker than the magnetic field generated by the data erasing apparatus when erasing data.
- the data erasure confirmation indicator of the present invention is easy to use as long as the external shape is flat.
- the external shape is preferably a card shape. If the external shape is card-like, it can be inserted in a narrow space and does not get in the way.
- the data erasure confirmation indicator of the present invention has a tape-like appearance and a plurality of tables. It may have a display part and can be separated for each display part.
- the powerful configuration makes it easy to store and use.
- the data erasure confirmation indicator of the present invention may have a first surface and a second surface, the first surface is for external viewing, and a paste layer is provided on the second surface.
- the indicator can be attached to a storage medium or a recording medium processing box (described later) by means of a glue layer.
- the external appearance of the indicator is a flat shape such as a card or tape, it is easy to use if an adhesive layer is provided on the second surface (that is, the back surface).
- the display on the display section changes on condition that the maximum intensity is placed in a magnetic field of 12 OkAZm or more.
- the maximum intensity here refers to the maximum intensity of the magnetic field that changes over time. According to the experiments by the present inventors, the maximum intensity required for erasing and destroying data recorded on a recording medium in an irreproducible manner varies depending on the structure of the recording medium, etc., but is generally about 120 kAZ m ( The power was about 1500 oersted).
- the data erasure confirmation indicator of the present invention is based on this fact, and the display on the display unit is changed on condition that the maximum intensity is placed in a magnetic field of 120 kA Zm or more.
- Another aspect of the present invention is a recording medium processing box in which any of the data erasure confirmation indicators described above is attached to the surface, and a plurality of recording media can be accommodated therein.
- a plurality of recording media are housed inside and the whole box is exposed to a magnetic field. According to the box of the present invention, it can be inferred that the data on the internal recording medium has been destroyed by visually confirming the change in the display part of the data erasure confirmation indicator attached to the surface.
- the indicator In order to attach the indicator to the surface of the recording medium processing box, the indicator may simply be placed on the box, but it is preferably fixed in some way from the standpoint of stabilizing the position of the indicator. To fix the indicator, it can be pasted immediately before the data erasure processing. However, if the indicator is attached to the surface of the recording medium processing box, it can be prevented from forgetting to attach the data. This eliminates the labor of the erasing operator.
- Yet another aspect of the present invention is a data erasing method, wherein the recording medium and the above-mentioned data erasure confirmation indicator are placed in a damped alternating magnetic field whose peak value decreases with time. It is.
- the damped alternating magnetic field referred to in the present invention refers to a magnetic field in which the magnetic flux density is lowered while alternately reversing the magnetic poles.
- data including an accommodating portion, a magnetic field generating portion capable of generating a damped alternating magnetic field in the accommodating portion, and an exterior case that covers the accommodating portion with an external force. It is only necessary to use an erasing device and place a recording medium and a data erasure confirmation indicator in the accommodating portion.
- a typical example of a recording medium is a hard disk device through each aspect of the present invention.
- a hard disk unit is a unit that contains a solid magnetic disk that records magnetic data.
- the concept of recording media also includes small or large magnetic tapes used in general-purpose computers or video tapes used in general households.
- the method of placing the recording medium in the damped alternating magnetic field is arbitrary, and a plurality of recording media are packed in a box or the like, which is individually stored in the magnetic field, and the box is placed in the magnetic field. May be. Also, apply a damped alternating magnetic field to a device (recording medium-using device) such as a computer device or a hard disk device in which the recording medium is incorporated. That is, the external magnetic field of the computer device may be applied in a state where it is incorporated in the computer device without removing the hard disk.
- a device recording medium-using device
- the external magnetic field of the computer device may be applied in a state where it is incorporated in the computer device without removing the hard disk.
- the magnetic material when a magnetic field is suddenly applied around a magnetic material, the magnetic material can be magnetized to a predetermined strength. Further, the magnetic material can be demagnetized by positioning the magnetized magnetic material in the magnetic field and gradually decreasing the strength of the magnetic field to zero, or by gradually moving the magnetized magnetic material away from the magnetic field force. Such demagnetization characteristics are also applied to demagnetizers (head erasers) of magnetic heads used in tape recorders and video recorders.
- the method of this aspect performs demagnetization using this demagnetization characteristic.
- the above-mentioned damped alternating magnetic field and the recording medium described above Some data erase confirmation indicator Put the caterer. Therefore, it is possible to confirm with the data erasure confirmation indicator that the data on the recording medium has been erased.
- the data erasure confirmation indicator when the recording medium and the data erasure confirmation indicator are placed in the damped alternating magnetic field, the data erasure confirmation indicator may be attached to the recording medium so as to be visible.
- the data erasure confirmation indicator may be simply placed on the recording medium, but the data erasure confirmation indicator may be attached by an adhesive means such as an adhesive tape. It is also preferable to attach the indicator on the recording medium in view of stability of the indicator position.
- the magnetic erasure is about 30% to 50% weaker than the magnetic field generated by the data erasing device. It is preferable to keep the body layer magnetized.
- the data erasure confirmation indicator of the present invention changes the display unit when exposed to a magnetic field, so that when used with a recording medium, the data erasure confirmation indicator knows whether or not the recording medium is exposed to a magnetic field of a predetermined strength. be able to. Therefore, it can be visually confirmed that the data has been destroyed, and the anxiety of the person who performed the data erasure work can be eliminated.
- the recording medium processing box of the present invention When the recording medium processing box of the present invention is used, there is an effect that data erasure processing of a plurality of storage media can be performed at a time. The processing status of the recording medium stored in the box can be confirmed with the data erasure confirmation indicator.
- FIG. 1 is a perspective view of a data erasure confirmation indicator according to an embodiment of the present invention.
- FIG. 2 is an exploded perspective view showing the layer structure of the data erasure confirmation indicator shown in FIG.
- FIG. 3 is a cross-sectional view around the display part of the data erasure confirmation indicator of FIG.
- FIG. 4 is a basic circuit diagram of a data erasing apparatus employed in the data erasing method of the present invention.
- FIG. 5 is a graph showing the intensity of a magnetic field generated by the data erasing apparatus of FIG. 6 is an exploded perspective view showing the structure of the data erasing device of FIG.
- FIG. 7 is a perspective view showing a form when the data erasure confirmation indicator of the embodiment of the present invention is inserted into the data erasure apparatus.
- FIG. 8 is a perspective view showing another form when the data erasure confirmation indicator of the embodiment of the present invention is inserted into the data erasure apparatus.
- FIG. 9 is an enlarged cross-sectional perspective view around the display unit of the data erasure confirmation indicator of the second embodiment of the present invention.
- FIG. 10 is a perspective view of a data erasure confirmation indicator according to a third embodiment of the present invention.
- the data erasure confirmation indicator (hereinafter simply referred to as an indicator) 1 of the present embodiment has a card-like appearance. That is, the indicator 1 is a thin plate having a rectangular outer shape, and is about the size and thickness of a business card. Specifically, the indicator 1 is a rectangle having a total length of 7 to 9 cm and a width of about 1Z2, and the thickness is about 0.2 to 0.8 mm.
- the display unit 2 is provided at the center of one surface side.
- the size of the display unit 2 is about 10 percent of the area of one side of the indicator 1, but the size of the display unit 2 is arbitrary, and the majority of the area of one side of the indicator 1 is large. Even if it occupies
- the indicator 1 of the present embodiment can cause the display unit 2 to display a desired display by a card writer equipped with a magnetic head.
- Indicator 1 is a transparent film layer 5, core layer 6, and magnetic layer 7 bonded and bonded by an adhesive layer (not shown).
- Transparent film layer 5 is a transparent resin film such as transparent PET (polyethylene terephthalate). It is constituted by the system.
- the core layer 6 is a plate-like support, and is made of various plastics such as polypropylene, polyethylene, polyethylene terephthalate, butyl chloride, ABS, PBT, and POM (polyacetal), various metals, and various cardboards.
- the rigidity of the indicator 1 is substantially retained by the core layer 6.
- the plate constituting the core layer 6 is provided with a rectangular opening 10 at the center as shown in FIG.
- the magnetic layer 7 is provided with a magnetic layer on one side or both sides of a base film (not shown). More specifically, the magnetic layer 7 is formed by applying a magnetic paint in which magnetic powder is dissolved with a binder to a base film. At that time, before the magnetic coating is hardened, a static magnetic field is applied to align the easy axis of magnetization of the magnetic powder in the direction of the magnetic field to obtain a desired magnetic orientation.
- the magnetic powder used for the magnetic layer 7 has material strengths such as iron, nickel, stainless steel such as iron 'nickel or iron-nickel' chrome, aluminum 'cobalt alloy, samarium.cobalt alloy.
- the indicator 1 of the present embodiment has a layer structure in which a transparent film layer 5 is laminated on one surface (front side) with a core layer 6 at the center.
- a magnetic layer 7 is laminated on the other side (back side). Both the transparent film layer 5 and the magnetic layer 7 described above cover the entire surface of the core layer 6. Therefore, in the indicator 1 of the present embodiment, as shown in FIG. 3, the cavity 11 is formed in the portion of the opening 10 of the core layer 6. That is, the core layer 6 has an opening 10, and one opening surface of the opening is covered with the transparent film layer 5, and the other opening surface is covered with the magnetic layer 7, so that the core layer 6 is closed to the opening portion of the core layer 6. A space is formed.
- a small amount of magnetic particles 12 are sealed in the hollow portion 11.
- the magnetic particles are made of iron, nickel, iron nickel, stainless steel such as iron 'nickel' chrome, aluminum 'cobalt alloy, samarium cobalt alloy, etc.
- the magnetic particles 12 can move freely in the cavity 11.
- the surface side of the cavity 11 is covered with the transparent film layer 5.
- the layer 5 is transparent, the appearance of the cavity 11 can also be visually observed by external force. That is, the magnetic particles 12 in the cavity 11 can be observed from the outside.
- the magnetic head is positioned close to the magnetic layer 7 located on the back side of the display unit 2 of the indicator 1 and the magnetic layer 7 is specified by moving the magnetic head and the indicator 1 relatively. Magnetize the part, and this magnetized part draws the desired character or figure pattern Make it.
- the indicator 1 can visually observe the state of the cavity 11 as described above. That is, since the magnetic particles 12 in the cavity 11 can be observed from the outside, it is possible to observe through the transparent film layer 5 how the magnetic particles 12 are arranged along the magnetic pattern. it can.
- the display on the display unit 2 also disappears. That is, as described above, the magnetic layer 7 was magnetized by the magnetic head to generate a minute magnet in the magnetic layer 7, but when exposed to a stronger magnetic field than this time, the magnetism of the magnetic layer 7 was reduced. It disappears and the display 2 changes.
- the present invention uses this property to infer whether or not the data on the recording medium has been destroyed. That is, the indicator 1 of this embodiment is used by being inserted into a data erasing device that generates a magnetic field together with a recording medium to be erased.
- FIG. 4 is a basic circuit diagram of a data erasing apparatus employed in the data erasing method of the invention.
- FIG. 5 is a graph showing the strength of the magnetic field generated by the data erasing apparatus of FIG.
- FIG. 6 is an exploded perspective view showing the structure of the data erasing apparatus of FIG.
- the data erasing device is roughly provided with a magnetic field generating unit 20, an electromagnetic wave generating unit (microwave generating unit) 30, a control unit 50, and a power transformer 34 for supplying AC power to these units. Configured.
- the power transformer 34 receives commercial power (AC100V) and generates the necessary AC voltage for each part. It is connected to the primary winding 35 and the magnetic field generator 20 connected to the AC100V side. Secondary windings 13, secondary windings 14 and 15 connected to the electromagnetic wave generation unit 30, and secondary windings 16 connected to the control unit 50.
- AC100V commercial power
- Secondary windings 13, secondary windings 14 and 15 connected to the electromagnetic wave generation unit 30, and secondary windings 16 connected to the control unit 50.
- the magnetic field generation unit 20 excites the electric charge charged in the capacitor 22. It has a function to generate a damped alternating magnetic field by discharging through the air pipe 23 as shown in Fig. 5.
- the secondary winding 13 of the power transformer 34 is connected to the bridge diode 21, and the rectified output of the bridge diode 21 is connected to the capacitor 22 via the charging contact 25.
- both ends of the capacitor 22 are configured to be connected to a series circuit of a rear tuttle 26, an excitation coil 23, and an excitation contact 24 via a polarity inversion unit 27.
- a polar electrolytic capacitor is used for the capacitor 22.
- the rear tuttle 26 provided in series with the exciting coil 23 has a function of stabilizing the current flowing to the exciting coil 23.
- the polarity reversing unit 27 includes contacts 27a and 27b that are interlocked and switched, and has a function of reversing the direction of the current flowing from the capacitor 22 to the exciting coil 23 by switching and connecting the contacts 27a and 27b.
- the magnetic field generator 20 generates a damped alternating magnetic field by the following operation. First, with the excitation contact 24 open, the charging contact 25 is closed and the capacitor 22 is charged. Charging is performed until the charging voltage of the capacitor 22 reaches the peak value of the voltage that is full-wave rectified by the bridge diode 21. The time required for charging is determined according to the capacitance of the capacitor 22 and the winding resistance of the secondary winding 13 of the power transformer 34.
- the charging contact 25 is opened. At this time, the capacitor 22 is fully charged, and the terminal voltage is approximately equal to the peak value of the voltage that is full-wave rectified by the bridge diode 21.
- the exciting contact 24 is closed, the electric charge charged in the capacitor 22 is rapidly discharged through the exciting coil 23.
- the capacitor 22 and the excitation coil 23 are connected in series to form a series resonance circuit. Therefore, when the exciting contact 24 is closed, a damped alternating current i whose peak value decreases with the passage of time flows through the exciting coil 23 as shown in FIG.
- the period of the damped alternating current i flowing in the exciting coil 23 is generally determined by the capacitance of the capacitor 22 and the inductance of the exciting coil 23.
- the attenuation rate of the damped alternating current i is determined by the internal resistance of the capacitor 22 and the resistance component of the exciting coil 23. That is, when the exciting contact 24 is closed, as shown in FIG. 5, the alternating current i having a period and a damping rate determined by the series resonance circuit of the capacitor 22 and the exciting coil 23 is energized to the exciting coil 23, and the energizing current is polar. Attenuates while inverting and reaches zero.
- the magnetic field generator 20 generates a damped alternating magnetic field based on such a principle, and erases the magnetic data recorded on the magnetic data recording medium using the generated damped alternating magnetic field. That is, the magnetic field generating unit 20 of the data erasing apparatus of the present embodiment is a circuit having a function of generating a damped alternating magnetic field in which the magnetic flux density decreases with the passage of time that does not generate a strong magnetic field for a long time. .
- the data erasing device includes a housing portion 60 and a mechanism member of an outer case 66 that covers the housing portion 60 from the outside.
- the accommodating portion 60 is a rectangular box made of a nonmagnetic material having a space inside, and the front surface is opened, and the top, bottom, left, right, and rear surfaces are closed.
- a magnetron 31 (magnetic field generating portion) is fixed to the central portion of the upper surface of the housing portion 60.
- an exciting coil 23 is provided on the outer wall of the accommodating portion 60.
- a door 62 is attached to the front end of the housing 60.
- the outer case 66 is a box made of a magnetic material that is larger than the housing portion 60, and has a shape that allows the housing portion 60 to be housed by partially opening the front surface and closing the top, bottom, left, and right sides and the rear surface.
- a circuit storage portion 17 that stores the circuit block 33 shown in FIG. 4 is provided on the upper part of the exterior case 66.
- the recording medium to be discarded is put in the storage unit 60 of the data erasing apparatus to erase the data.
- the indicator 1 of the present embodiment is also stored in the storage unit 60.
- 7 and 8 are perspective views showing a form when the data erasure confirmation indicator of the embodiment of the present invention is inserted into the data erasure apparatus.
- the storage method of the recording medium is arbitrary.
- a large number of hard disk devices, flexible disks, and the like may be placed in a box (recording medium processing box) 95, and this box may be placed in the storage unit 60 of the data erasing device.
- the indicator 1 of this embodiment is placed on the top of the box (recording medium processing box) 95 and the indicator 1 is put into the data erasing apparatus together with the box 95.
- the force indicator 1 is integrated on the surface of the box (recording medium processing box) 95. It is possible to install it.
- the hard disk device 8 may be put in the housing unit 60 alone. Even in this case, the indicator 1 is placed on the hard disk device 8 or attached with an adhesive tape.
- a recording medium using device such as a computer device with a built-in hard disk may be placed in the storage unit 60 as it is. Even in this case, the indicator 1 is placed on the casing of the computer device or attached with an adhesive tape.
- the above-described data erasing device is activated to apply a damped alternating magnetic field having a predetermined strength to the recording medium.
- the data on the recording medium is erased and destroyed.
- the indicator 1 is also exposed to the magnetic field along with the recording medium. For this reason, indicator 1 is also degaussed, and the characters “ORIENT—CHECKER” in display section 2 disappear.
- the recording medium is taken out from the data erasing device. There is no change in the external shape of the removed recording medium before and after the operation, but the indicator 1 enclosed in the storage section 60 has changed the display on the display section 2 and is placed nearby. It is presumed that the same magnetic force was applied to the recorded recording medium. Therefore, the worker is convinced that the data on the recording medium has been erased.
- the indicator 1 has a structure in which the magnetic particles 12 are put in the cavity 11 provided in the core layer 6. That is, in the above-described embodiment, each of the magnetic particles has a structure that can freely move throughout the entire cavity 11.
- the present invention is not limited to this structure.
- the magnetic particles are enclosed in a resin microcapsule and can be freely moved only within the microcapsule.
- FIG. 9 is an enlarged cross-sectional perspective view around the display unit of the data erasure confirmation indicator according to the second embodiment of the present invention.
- the display unit has a large number of microcapsules 42 and is made of synthetic resin.
- the material dispersed in 41 is placed on the magnetic layer 43 and formed into a plate shape.
- a liquid and magnetic particles floating in the liquid and sensitive to a magnetic field are enclosed.
- a transparent film layer 44 is provided on the opposite side of the magnetic layer 43. That is, in the indicator 40, the display unit is formed by laminating the magnetic layer 43, the magnetic particle layer, and the transparent film layer 44 in this order. However, the transparent film layer 44 may be omitted.
- the indicator has any card shape, and the shape of the force indicator is arbitrary.
- FIG. 10 shows a perspective view of the data erasure confirmation indicator 45 according to the third embodiment of the present invention.
- the appearance as shown in FIG. 10 is a tape shape and a plurality of (or many) displays. It is also possible to form a data erasure confirmation indicator 45 having a section and use it separately for each display section 2. In order to separate the data erasure confirmation indicator 45 for each display section 2, it may be separated using a scissors knife.
- a number of aligned small holes (so-called perforations) ) If 46 is provided in advance, it can be easily separated by tearing or tearing with the hands of the operator. However, the small hole 46 is not essential, so that the material and thickness of the indicator 45 can be separated by tearing or splitting by the hand of the operator.
- the threshold value of the magnetic field strength for changing the display of the indicator 1 (hereinafter referred to as "change strength") be set in accordance with the magnetic field generated by the data erasing device. That is, in order to display characters or the like on the indicator 1, it is performed by magnetizing the magnetic layer 7 of the indicator as described above, but when the display is changed according to the strength of the magnetic field at this time.
- the magnetic field strength changes. Therefore, for example, it is desirable to magnetize the magnetic layer 7 with a magnetic force that is about 30% to 50% weaker than the magnetic field generated by the data erasing device.
- the data recorded on the recording medium is erased in a non-reproducible manner.
- the maximum strength required to destroy is different depending on the type of recording medium structure, etc., but is generally lower in older models. It is about 120 kAZm (about 1500 oersted), and recently about 320 kAZm (about 4000 oersted). Therefore, several types of i On the other hand, it is recommended to check the maximum strength required for each structure type of the recording medium through experiments and to use an indicator having a change strength corresponding to the processing target.
- the indicator of the present embodiment when used, it can be visually confirmed that the recording medium has been exposed to the magnetic field of a predetermined strength, and it can be confirmed that the data has been erased. effective.
Landscapes
- Magnetic Record Carriers (AREA)
- Credit Cards Or The Like (AREA)
- Recording Or Reproducing By Magnetic Means (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/793,835 US20080007857A1 (en) | 2004-12-24 | 2005-12-19 | Indicator for Confirming Data Erasure, Box for Use in Processing Recording Media, and Method for Erasing Data |
EP05816659A EP1826581A4 (en) | 2004-12-24 | 2005-12-19 | INDICATOR CONFIRMING DATA ERASURE, RECORDING MEDIUM PROCESSING BOX AND DATA ERASING METHOD |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004-373581 | 2004-12-24 | ||
JP2004373581A JP2006179151A (ja) | 2004-12-24 | 2004-12-24 | データ消去確認インジケータ及びデータ消去方法 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2006068098A1 true WO2006068098A1 (ja) | 2006-06-29 |
Family
ID=36601698
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2005/023283 WO2006068098A1 (ja) | 2004-12-24 | 2005-12-19 | データ消去確認インジケータ、記録媒体処理箱及びデータ消去方法 |
Country Status (4)
Country | Link |
---|---|
US (1) | US20080007857A1 (ja) |
EP (1) | EP1826581A4 (ja) |
JP (1) | JP2006179151A (ja) |
WO (1) | WO2006068098A1 (ja) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20080136407A1 (en) * | 2006-12-06 | 2008-06-12 | International Business Machines Corporation | System and method for magnetic field exposure indication |
JP2010088617A (ja) * | 2008-10-07 | 2010-04-22 | Maruhon Ind Co Ltd | パチンコ機 |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6325575A (ja) * | 1986-07-18 | 1988-02-03 | Toshiba Corp | 表示装置 |
JPS6435576U (ja) * | 1987-08-25 | 1989-03-03 | ||
JPH02170073A (ja) * | 1988-12-23 | 1990-06-29 | Riken Corp | 磁気センサ |
JPH04328302A (ja) * | 1991-04-30 | 1992-11-17 | Hitachi Building Syst Eng & Service Co Ltd | 磁気データ消去装置 |
JP2004192682A (ja) * | 2002-12-09 | 2004-07-08 | Orient Sokki Computer Kk | 磁気記憶装置の記録データ消去装置及び同消去方法 |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5270899A (en) * | 1988-11-14 | 1993-12-14 | Sanix Corporation | Erasing apparatus |
-
2004
- 2004-12-24 JP JP2004373581A patent/JP2006179151A/ja active Pending
-
2005
- 2005-12-19 WO PCT/JP2005/023283 patent/WO2006068098A1/ja active Application Filing
- 2005-12-19 EP EP05816659A patent/EP1826581A4/en not_active Withdrawn
- 2005-12-19 US US11/793,835 patent/US20080007857A1/en not_active Abandoned
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6325575A (ja) * | 1986-07-18 | 1988-02-03 | Toshiba Corp | 表示装置 |
JPS6435576U (ja) * | 1987-08-25 | 1989-03-03 | ||
JPH02170073A (ja) * | 1988-12-23 | 1990-06-29 | Riken Corp | 磁気センサ |
JPH04328302A (ja) * | 1991-04-30 | 1992-11-17 | Hitachi Building Syst Eng & Service Co Ltd | 磁気データ消去装置 |
JP2004192682A (ja) * | 2002-12-09 | 2004-07-08 | Orient Sokki Computer Kk | 磁気記憶装置の記録データ消去装置及び同消去方法 |
Non-Patent Citations (1)
Title |
---|
See also references of EP1826581A4 * |
Also Published As
Publication number | Publication date |
---|---|
EP1826581A4 (en) | 2008-01-02 |
US20080007857A1 (en) | 2008-01-10 |
EP1826581A1 (en) | 2007-08-29 |
JP2006179151A (ja) | 2006-07-06 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
WO2006068098A1 (ja) | データ消去確認インジケータ、記録媒体処理箱及びデータ消去方法 | |
US20070019355A1 (en) | Magnetic data eraser and method for erasing magnetic data | |
JP2003071978A (ja) | 磁気吸着シート | |
JP3088608U (ja) | ハードディスク装置の記録データ消去装置 | |
US20060273419A1 (en) | Magnetic field sensing device | |
JP4071096B2 (ja) | 磁気記憶装置の記録データ消去装置 | |
WO2004053851A1 (ja) | 磁気記憶装置の記録データ消去装置及び同消去方法 | |
JPS6339966B2 (ja) | ||
KR20090117485A (ko) | 자석 및 열발생장치를 이용하여 기록매체에 저장된 정보를제거하는 디가우저 장치 | |
EP1906388A1 (en) | Magnetic data erasing device | |
JPH03189794A (ja) | 電磁物質監視装置で使用される強磁性体のための増感剤 | |
JP2005276319A (ja) | 磁気記録媒体に記録された磁気情報を消去するための方法及び装置 | |
JP3121977B2 (ja) | 磁気記録媒体とその製造方法 | |
JPS6134636Y2 (ja) | ||
JP3084342B2 (ja) | 磁気記録媒体の製造方法 | |
JP2009143162A (ja) | シート体、小冊子体及び封筒 | |
JP3374225B2 (ja) | 表示器付き磁気カード | |
JP3116207B2 (ja) | 可視磁気カード | |
JP2007280487A (ja) | 磁界発生装置、磁気情報消去装置および着磁装置 | |
JPH09311631A (ja) | ラベル記録装置、情報記録装置およびラベル | |
JPS62146154A (ja) | 包袋 | |
JPS6117215A (ja) | 消磁器 | |
JPH0754579B2 (ja) | 可視磁気カ−ド | |
JPH0414603A (ja) | 磁気情報消去装置 | |
JP2005122842A (ja) | 磁気記録媒体に記録された磁気情報を消去するための方法及び装置 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AK | Designated states |
Kind code of ref document: A1 Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BW BY BZ CA CH CN CO CR CU CZ DE DK DM DZ EC EE EG ES FI GB GD GE GH GM HR HU ID IL IN IS KE KG KM KN KP KR KZ LC LK LR LS LT LU LV LY MA MD MG MK MN MW MX MZ NA NG NI NO NZ OM PG PH PL PT RO RU SC SD SE SG SK SL SM SY TJ TM TN TR TT TZ UA UG US UZ VC VN YU ZA ZM ZW |
|
AL | Designated countries for regional patents |
Kind code of ref document: A1 Designated state(s): BW GH GM KE LS MW MZ NA SD SL SZ TZ UG ZM ZW AM AZ BY KG KZ MD RU TJ TM AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LT LU LV MC NL PL PT RO SE SI SK TR BF BJ CF CG CI CM GA GN GQ GW ML MR NE SN TD TG |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
WWE | Wipo information: entry into national phase |
Ref document number: 2005816659 Country of ref document: EP |
|
WWE | Wipo information: entry into national phase |
Ref document number: 11793835 Country of ref document: US |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
WWP | Wipo information: published in national office |
Ref document number: 2005816659 Country of ref document: EP |
|
WWP | Wipo information: published in national office |
Ref document number: 11793835 Country of ref document: US |