WO2007020970A1

WO2007020970A1 - Data eraser, and data erasing method

Info

Publication number: WO2007020970A1
Application number: PCT/JP2006/316158
Authority: WO
Inventors: Tomoaki Ito
Original assignee: Orient Instrument Computer Co., Ltd.
Priority date: 2005-08-19
Filing date: 2006-08-17
Publication date: 2007-02-22

Abstract

A data eraser which can erase data thoroughly. The data eraser (1) comprises an outer box (2), a destruction chamber (3), and a containing section (5). The interior of the destruction chamber (3) is hollow, and a supporting portion (10) is provided at the innermost position. An exciting coil (magnetic field generating means) (12) is fixed to the periphery of the destruction chamber (3). The containing section (5) is supported by the opening (6) of the destruction chamber (3), and the supporting portion (10) provided on the inner wall (11). Under that state, a damping AC magnetic field is generated in the destruction chamber (3) by the exciting coil (12). Since an iron piece (31) is fixed to the bottom of the containing section (5), the iron piece (31) reacts to the magnetic field and receives a force to move the containing section (5) entirely to the opening (6) side where the containing section (5) takes an inclining posture. During the first-time excitation process, data in a hard disk (68) is erased and the posture of the hard disk (68) is varied. Subsequently, a second-time excitation process is performed.

Description

Specification

Data erasing apparatus and data erasing method

Technical field

The present invention relates to a data erasing apparatus and a data erasing method for erasing recorded data from a data recording medium such as a hard disk, floppy disk (registered trademark), video tape, magneto-optical disk (MO), and the like.

Background art

[0002] Hard disk devices built into computers use the OS (Operating System) to initialize the magnetic disk (physical format and logical format), and the location information of recorded data (FAT: File Allocation Table) 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.

[0003] However, data erasure software that makes it impossible to restore magnetic data prevents random data or “00” data from being overwritten on a magnetic disk to prevent restoration. Takes a lot of time. Also, when mechanically destroying a hard disk device, it takes time and effort to destroy the hard disk device. There are also cases where data can be read by both the force and the fragment force of a broken magnetic disk.

[0004] Therefore, a data erasing apparatus has been developed that erases magnetic data in a short time without overwriting data or destroying a hard disk device. For example, 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.

[0005] The data erasing device disclosed in Patent Document 1 has a case portion around which a coil is wound. Then, the hard disk device is inserted into the case part, and the coil is energized to generate a magnetic field in the case part. The hard disk device was recorded by the magnetic field generated by the coil The magnetic data is disturbed and the recorded data is erased.

[0006] In the data erasing apparatus disclosed in Patent Document 2, a plurality of coils are arranged in parallel, and a voltage is applied in order to erase magnetic data in order of the front part, the center part, and the rear part. This data eraser generates a magnetic field in the range of over 2500 Oersteds and erases magnetic data with this magnetic field.

[0007] According to the data erasing apparatus disclosed in these patent documents, the recorded magnetic data can be erased in a short time by simply inserting the hard disk device and performing the data erasing operation.

Therefore, the node disk device from which the data has been erased can be discarded as it is, or can be reused by being mounted on the computer again.

In the data erasing devices disclosed in these patent documents, the hard disk device is stationary during the processing, and its posture does not change.

Patent Document 1: Utility Model Registration No. 3088608

Patent Document 2: JP-A-2005-78713

Disclosure of the invention

Problems to be solved by the invention

[0008] According to the data erasing apparatus disclosed in Patent Document 1, the magnetic data recorded as described above is disturbed, and the recorded data is erased. Therefore, it is impossible to read data by general means.

However, for highly confidential and important information that provides evidence of state secrets and criminal cases, information can be read out using all possible means. For this reason, it is necessary to deal with such vital information so that it cannot be read more completely.

[0009] When looking at the data erasing device disclosed in the above patent document, it is said that the data erasing is complete!

In other words, in the data erasing apparatus disclosed in the above-mentioned patent document, a situation may occur in which magnetism does not reach a part of the magnetic disk behind a certain member. For this reason, there is a concern that a small part of the recorded data may remain. For example, when erasing magnetic data recorded on a hard disk, if a magnetic field is applied in one radial direction of the magnetic disk provided inside, sufficient magnetic force cannot be applied to the rear part of the rotating shaft, and the magnetic data is partially It is possible to remain.

Even if part of the magnetic data remains, it is impossible to retrieve only this by the usual method, and there is no concern that the data will be read. However, if the information is at the national secret level as described above, data can be read with extremely high knowledge and equipment. Therefore, it is necessary to avoid leaving data even in a part of the disk.

[0010] Therefore, the present invention focuses on the above-described problems of the prior art, and an object of the present invention is to develop a data erasing device that can erase data more completely.

Means for solving the problem

One aspect of the present invention for solving the above-mentioned problem is a data erasing device for erasing data recorded on a data recording medium, and a magnetic field generating means for generating a magnetic field Or an electromagnetic wave generating means for generating an electromagnetic wave having a predetermined frequency and a predetermined intensity, and a data recording medium for either or both of the magnetic field generating means and the electromagnetic wave generating means. A data erasing device characterized in that the posture can be relatively changed.

[0012] The data erasing device of this aspect is for erasing data recorded on a data recording medium, and generates a magnetic field generating means for generating a magnetic field or an electromagnetic wave having a predetermined frequency and a predetermined intensity. One or both of electromagnetic wave generation means! The data erasing apparatus of this aspect can change the attitude of the data recording medium relative to one or both of the magnetic field generating means and the electromagnetic wave generating means. Therefore, even if there is a shadow part when processing in the basic posture, the shadow state is resolved by changing the posture of the data recording medium relative to the magnetic field generating means or electromagnetic wave generating means. The data in the area is erased.

Examples of configurations that change the attitude of the data recording medium relative to the magnetic field generating means or electromagnetic wave generating means include a configuration that changes the attitude of the data recording medium itself, and a configuration that changes the attitude of the magnetic field generating means or electromagnetic wave generating means. , And data recording And a configuration in which the postures of both the recording medium and the magnetic field generating means or the electromagnetic wave generating means are changed.

Here, a typical example of the data recording medium referred to in this aspect is a hard disk device. A hard disk unit is a unit that contains a solid magnetic disk that records magnetic data. The concept of data recording media also includes small or large magnetic tapes used in general-purpose computers or video tapes used in general households. In addition, the data erasing device of this aspect can also process the entire device in which the node disk device is incorporated. In other words, it can be processed by the data erasing apparatus of this aspect in a state where it is incorporated in a computer apparatus or the like without removing the hard disk.

[0013] Preferably, at least the attitude of the data recording medium itself can be changed.

[0014] In this preferred aspect of the data erasing apparatus, by changing the attitude of the data recording medium itself, the shadow state in the basic attitude is eliminated, and the data in all areas are erased. In this aspect, a configuration in which the attitude of the magnetic field generating means or the electromagnetic wave generating means is changed at the same time can be employed.

In this preferred aspect of the data erasing apparatus, a destruction chamber exposed to a magnetic field generated by the magnetic field generation means or an electromagnetic wave generated by the electromagnetic wave generation means, and a data recording medium itself or a data recording provided in the destruction chamber A support unit that supports a storage unit that stores the medium, and any of the force of the support unit, the data recording medium itself, and the storage unit can be moved, and the support by the support unit is released by moving these. Can be adopted.

[0016] In this preferred aspect of the data erasing device, the destruction chamber is provided with a support part for supporting the data recording medium itself or the storage part, and when the data recording medium is in a basic posture, the data recording medium is supported by the support part. It is supported by itself!

Further, in this preferable aspect, any one of the support portion, the data recording medium itself, and the storage portion can be moved, and the support of the support portion is released by moving these. For this reason, the balance of the data recording medium is lost, and the attitude of the data recording medium changes.

On the other hand, a destruction chamber exposed to the magnetic field generated by the magnetic field generation means or the electromagnetic waves generated by the electromagnetic wave generation means, and the data recording medium itself provided in the destruction chamber or Is provided with a support portion that can support a storage portion for storing the data recording medium, and any one of the support portion, the data recording medium itself, and the storage portion is movable, and is supported by moving these. A state force in which the support by the part is released A configuration that changes to a supported state can also be adopted.

[0018] This preferred aspect data erasing apparatus performs the reverse operation of the preferred aspect data erasing apparatus, and any one of the support section, the data recording medium itself, and the storage section moves. Thus, the state force that is not supported by the support portion is changed to a supported state. As a result, the balance of the data recording medium changes, and the attitude of the data recording medium changes.

[0019] On the other hand, a magnetic field generated by the magnetic field generating means or a destruction chamber exposed to the electromagnetic waves generated by the electromagnetic wave generating means, and the data recording medium itself or the data recording medium provided in the destruction chamber are accommodated. And a support unit that supports the storage unit, and any one of the support unit, the data recording medium itself, and the storage unit is movable, and the data recording medium itself or the data recording medium is stored by moving them. It is also possible to adopt a configuration in which the support balance of the storage section to be changed changes.

[0020] The erasing apparatus of this preferable aspect also includes a support part for supporting the data recording medium itself or the storage part in the destruction chamber, and when the data recording medium is in a basic posture, the data recording medium is supported by the support part. Etc. are supported with a predetermined balance.

Further, in this preferable aspect, any one of the support unit, the data recording medium itself, and the storage unit can be moved, and the support balance of the data recording medium itself or the storage unit is changed by moving these. As a result, the balance of the data recording medium is lost, and the attitude of the data recording medium changes.

[0021] Preferably, at least magnetic field generation means is provided, and any one of the support section, the data recording medium itself, and the storage section is movable by the action of a magnetic field generated by the magnetic field generation means.

[0022] In this aspect of the data erasing apparatus, since the support portion and the like are moved by the action of the magnetic field generated by the magnetic field generating means, the structure is simple.

[0023] Preferably, the data erasing apparatus of the above aspect is at least the appearance of the data recording medium itself. It will change the momentum. On the other hand, the attitude of the magnetic field generating means or the electromagnetic wave generating means may be changed. That is, in another preferable aspect, it is possible to change the attitude of at least one of or both of the magnetic field generating means and the electromagnetic wave generating means.

[0024] In this preferred aspect of the data erasing device, the shadow state in the basic posture is eliminated by changing the posture of one or both of the magnetic field generating means and the electromagnetic wave generating means. Data is deleted. In this aspect, a configuration in which the attitude of the data recording medium itself is changed at the same time can be employed.

[0025] Preferably, a destruction chamber is provided which contains a data recording medium and is exposed to one or both of a magnetic field generated by the magnetic field generation means and an electromagnetic wave generated by the electromagnetic wave generation means. By swinging, the attitude of one or both of the magnetic field generating means and the electromagnetic wave generating means is changed.

[0026] In this preferred aspect of the data erasing apparatus, a data recording medium is accommodated and a destruction chamber exposed to the magnetic field generated by the magnetic field generating means or the electromagnetic waves generated by the electromagnetic wave generating means is provided. As the chamber swings, the attitude of either or both of the magnetic field generating means and the electromagnetic wave generating means changes. The data erasing apparatus of this aspect has a simple structure because the appearance of the magnetic field generating means or the electromagnetic wave generating means is changed by swinging the destruction chamber.

[0027] Preferably, during the data erasing process by one or both of the magnetic field generating means and the electromagnetic wave generating means, or the data erasing process by either one or both of the magnetic field generating means and the electromagnetic wave generating means. It is possible to change the attitude of the data recording medium itself, or the attitude of the magnetic field generating means and the electromagnetic wave generating means, or both or both of them, during a plurality of times.

[0028] In the data erasing apparatus of this preferable aspect, the data erasing process is performed before and after the attitude change. For this reason, magnetic fields and electromagnetic waves spread throughout the shadow area in the basic posture, and data is erased over the entire area.

[0029] Preferably, at least the attitude of the data recording medium itself can be changed. In an aspect, an inner case for accommodating the data recording medium, and an outer case for accommodating the inner case Further, a configuration in which the inner case is swingably supported by the outer case can be employed.

[0030] The outer case includes an inner case support portion that supports the inner case in a swingable manner, and a placement portion that can place and support one end of the inner case to hold the inner case in a substantially horizontal state. A configuration equipped with can also be adopted.

[0031] Further, at least an exciting coil is provided as a magnetic field generating means, and the exciting coil can generate a magnetic field in a direction from the inner case support portion to the mounting portion, and is in a positive direction with respect to the exciting coil. It is also possible to employ a configuration that further includes switching means that can sequentially switch and apply the voltage and the reverse voltage.

[0032] Preferably, the data recording medium accommodated in the inner case is used in a state of being movable along the bottom surface of the inner case.

[0033] According to this preferred aspect of the data erasing apparatus, the data recording medium can be moved within the inner case, and the shaded state can be surely resolved.

[0034] Preferably, the inner surface of the outer case and the outer surface of the outer case face each other, and a cushioning material is provided on a part or all of at least one of the inner surface and the outer surface.

According to this preferred aspect of the data erasing device, even if the inner case and the outer case collide during or after the inner case is swung, the impact is reduced.

[0036] Preferably, the switching means generates a first magnetic field generation process for applying a voltage in the forward direction, a second magnetic field generation process for applying a voltage in the reverse direction, and a third magnetic field generation for applying a voltage in the forward direction. Processing can be executed sequentially.

[0037] According to this preferred aspect of the data erasing apparatus, the shadow state is more reliably canceled.

[0038] The apparatus may further include an inner case that accommodates the data recording medium, and further includes a buffer member that can be fitted between the inner case and the data recording medium accommodated in the inner case.

[0039] Another aspect of the present invention is a data erasing method for erasing data recorded on a data recording medium, comprising a magnetic field generating means for generating a magnetic field, or an electromagnetic wave having a predetermined frequency and a predetermined intensity. Either one or both of the electromagnetic wave generating means to be generated is used, and either one or both of the magnetic field generating means and the electromagnetic wave generating means The data erasing method is characterized in that the data recording medium is exposed to a magnetic field or an electromagnetic wave in a plurality of positions where the attitudes of the data recording medium are relatively different.

[0040] The data erasing method of this aspect is for erasing data recorded on a data recording medium, and is a magnetic field generating means for generating a magnetic field, or an electromagnetic wave generating means for generating an electromagnetic wave having a predetermined frequency and a predetermined intensity. Either or both of these are used. The data erasing method of this aspect is that the data recording medium is placed in a plurality of postures in which the posture of the data recording medium relative to one or both of the magnetic field generating means and the electromagnetic wave generating means is relatively different. Expose to electromagnetic waves. According to the data erasing method of this aspect, data erasure processing is performed in multiple postures, so even if there is a shadow part when processing in one posture, the shadow state is resolved and all areas Data is deleted.

[0041] Preferably, at least the attitude of the data recording medium itself is changed.

[0042] In this preferred aspect of the data erasing method, the shadow state is eliminated by changing the attitude of the data recording medium itself, and the data in all areas are erased.

[0043] Preferably, the attitude of at least one of or both of the magnetic field generating means and the electromagnetic wave generating means is changed.

[0044] In this preferred mode of data erasing method, there is a magnetic field generating means! /, And the shadow state is eliminated by changing the attitude of the electromagnetic wave generating means, and the data in all areas are erased.

[0045] Preferably, during the data erasing process by one or both of the magnetic field generating means and the electromagnetic wave generating means, or the data erasing process by either one or both of the magnetic field generating means and the electromagnetic wave generating means. It is executed a plurality of times, during which the attitude of the data recording medium itself, or the attitude of either or both of the magnetic field generating means and the electromagnetic wave generating means is changed.

In this preferred mode of data erasing method, the data erasing process is performed before and after the attitude change. Even if there is a shadow part when processing in one posture, magnetic fields and electromagnetic waves are spread, and data is erased over the entire area.

The invention's effect

[0047] According to the data erasing apparatus of the present invention, data in all areas of the data recording medium is erased. Is done. Therefore, if data is erased by using the data erasing apparatus of the present invention, the data is not restored by any method.

The same applies to the data erasing method of the present invention, and data in all areas of the data recording medium is erased.

Brief Description of Drawings

FIG. 1 is a perspective view of a data erasing apparatus according to a first embodiment of the present invention.

FIG. 2 is an exploded perspective view of the data erasing apparatus of FIG.

FIG. 3 is a cross-sectional view of the data erasing device of FIG. 1, showing the internal hard disk device in a basic position.

FIG. 4 is a cross-sectional view of the data erasing device of FIG. 1, showing a state in which the internal hard disk device is in the second posture.

FIG. 5 is a basic circuit diagram of the data erasing apparatus shown in FIG. 1.

FIG. 6 is a graph showing the intensity of a magnetic field generated by the data erasing apparatus shown in FIG.

FIG. 7 is a flowchart showing an operation procedure of the data erasing apparatus shown in FIG. 1.

FIG. 8 is a cross-sectional view of a data erasing device according to a second embodiment of the present invention.

FIG. 9 is a cross-sectional view of a data erasing device according to a third embodiment of the present invention, showing a state in which the internal hard disk device is in a basic posture.

FIG. 10 is a cross-sectional view of the data erasing device of FIG. 9, showing a state in which the internal hard disk device is in the second posture.

FIG. 11 is a sectional view of a data erasing device according to a fourth embodiment of the present invention.

FIG. 12 is a perspective view of a data erasing device according to a fifth embodiment of the present invention.

13 is an exploded perspective view of the data erasing apparatus of FIG.

14 (a) is a front view of the data erasing device of FIG. 12, and FIG. 14 (b) is a right side view of the data erasing device of FIG.

FIG. 15 is a sectional view taken along line BB in FIG. 14 (b).

FIG. 16 is a cross-sectional view taken along line AA in FIG. 14 (a), showing a state where the destruction chamber is in a basic posture.

17 is a cross-sectional view showing a state where the destruction chamber is swung in the data erasing apparatus of FIG.

, (A) shows a state in the second posture, and (b) shows a state in the third posture. FIG. 18 is a perspective view of a data erasing device according to a sixth embodiment of the present invention.

FIG. 19 is a perspective view showing an internal configuration of the data erasing apparatus of FIG. 18.

FIG. 20 is a vertical right side view of the tray.

FIG. 21 is a plan view of the tray.

22 is a circuit block diagram of the data erasing device of FIG. 18.

FIG. 23 is a flowchart of operations executed by the data erasing apparatus of FIG.

FIG. 24 is an explanatory diagram for explaining the relationship between the attitude of the hard disk device and the direction of the magnetic field;

) Shows the status in step 3, (b) shows the status in step 5, and (c) shows the status in step 7.

FIG. 25 is a vertical right side view of the tray at the end of step 3.

FIG. 26 is a vertical right side view of the tray at the end of step 5.

FIG. 27 is an explanatory diagram for explaining the relationship between the direction of the magnetic field and the shadow area in the magnetic disk. BEST MODE FOR CARRYING OUT THE INVENTION

[0050] Embodiments of the present invention will be further described below.

First, a first embodiment of the present invention will be described with reference to FIGS.

[0051] The data erasing device 1 of the first embodiment includes an outer box part 2, a destruction chamber 3, and a storage part 5.

[0052] The destruction chamber 3 is a rectangular box made of a non-magnetic material such as resin, and only one surface on the front side is open. However, the size of the opening 6 is such that the front wall 8 is left slightly behind the front part, not the whole front part!

The inside of the destruction chamber 3 is hollow, but a support portion 10 is provided at the innermost position with respect to the opening 6 as shown in FIGS. The support portion 10 is provided only on the back wall 11 among the walls constituting the destruction chamber 3. The support 10 is continuous over the entire width of the back wall 11. The height of the upper end of the support portion 10 is equal to the height of the lower end of the opening 6 described above.

An excitation coil (magnetic field generating means) 12 is wound around the destruction chamber 3. A magnetron (electromagnetic wave generating means) 13 is attached to a part of the destruction chamber 3. The magnetron 13 has a function of destroying the optical recording medium, and generates electromagnetic waves having a predetermined strength of the antenna force. For example, the magnetron 13 generates a microphone mouth wave having a frequency of about 4.3 GHz and a wavelength of about 7 cm. Next, the storage unit 5 will be described. The storage part 5 has a shape like a deep drawer as shown in FIG. In other words, the storage unit 5 has a box shape in which only the top surface is opened. The storage unit 5 can store the hard disk device 68 in an upright state as will be described later. Accordingly, the storage unit 5 includes a front wall 20, a back wall 21, a bottom wall 22, and left and right side walls 23, 24 as shown in FIG. As shown in the figure, each wall has the largest side wall 23, 24 and the largest bottom wall 22.

A handle 30 is provided on the front wall 20 of the storage unit 5. An iron piece 31 is attached to the bottom wall 22 of the storage unit 5.

The width of the storage portion 5 is substantially equal to the inner surface of the destruction chamber 3 as shown in FIG. 2, but the height is lower than that of the destruction chamber 3. That is, the height of the storage portion 5 is substantially equal to the opening 6 provided in the destruction chamber 3.

The storage unit 5 is inserted into the destruction chamber 3 as shown in FIG. The storage 5 is supported by an opening 6 provided on the front side of the destruction chamber 3 and a support 10 provided on the back wall 11. That is, the end wall of the opening 6 provided on the front side and the support part 10 provided on the back wall 11 are in contact with the bottom wall 22 of the storage part 5 and both ends are supported at two points. It becomes a support state like.

The outer box portion 2 simply covers the outside of the destruction chamber 3.

Next, an electrical circuit of the data erasing apparatus 1 will be described with reference to FIGS.

[0059] As shown in FIG. 5, the data erasing apparatus 1 is roughly divided into a magnetic field generating unit 35, an electromagnetic wave generating unit (microphone mouth wave generating unit) 36, a control unit 50, and a power transformer 3 for supplying AC power to these units. Configured with four.

As shown in Fig. 5, the power transformer 34 receives commercial power (AC100V) and generates the necessary AC voltage for each part. The primary transformer 40 connected to the AC100V side and the magnetic field generator 35 The secondary winding 41 is connected, the secondary windings 46 and 47 are connected to the electromagnetic wave generation unit 36, and the secondary winding 48 is connected to the control unit 50.

In the apparatus of FIG. 5, the magnetic field generator 35 has a function of generating a damped alternating magnetic field as shown in FIG. 6 by discharging the electric charge charged in the capacitor 51 through the exciting coil 12. In the magnetic field generator 35, the secondary winding 41 of the power transformer 34 is connected to the bridge diode 52, and the rectified output of the bridge diode 52 is connected to the capacitor 51 via the charging contact 53. Has been. Further, both ends of the capacitor 51 are configured to be connected to a series circuit of the rear tuttle 56, the excitation coil 12, and the excitation contact 57 via the polarity inversion unit 55.

In this embodiment, a polar electrolytic capacitor is used as the capacitor 51. The rear tuttle 56 provided in series with the excitation coil (magnetic field generating means) 12 has a function of stabilizing the current flowing to the excitation coil 12. The polarity reversing unit 55 includes contacts 55a and 55b that are interlocked and switched, and has a function of reversing the direction of the current flowing from the capacitor 51 to the exciting coil 12 by switching and connecting the contacts 55a and 55b.

[0062] The magnetic field generator 35 generates a damped alternating magnetic field by the following operation. First, the charging contact 53 is closed and the capacitor 51 is charged while the excitation contact 57 is opened. Charging is performed until the charging voltage of the capacitor 51 reaches the peak value of the voltage that is full-wave rectified by the bridge diode 52. The time required for charging is determined in accordance with the capacitance of the capacitor 51 and the winding resistance of the secondary winding 41 of the power transformer 34.

[0063] When charging of the capacitor 51 is completed, the charging contact 53 is opened. At this time, the capacitor 51 is fully charged, and the terminal voltage is substantially equal to the peak value of the voltage that is full-wave rectified by the bridge diode 52. Next, when the exciting contact 57 is closed, the electric charge charged in the capacitor 51 is rapidly discharged through the exciting coil 12. Here, the capacitor 51 and the excitation coil 12 are connected in series to form a series resonance circuit. Therefore, when the excitation contact 57 is closed, a damped alternating current i whose peak value decreases with the passage of time flows through the excitation coil 12 as shown in FIG.

[0064] The period of the damped alternating current i flowing through the exciting coil 12 is generally determined by the capacitance of the capacitor 51 and the inductance of the exciting coil 12. The attenuation rate of the damped alternating current i is determined by the internal resistance of the capacitor 51 and the resistance component of the exciting coil 12. That is, when the excitation contact 57 is closed, as shown in FIG. 6, a decaying alternating current i having a period and a damping rate determined by the series resonance circuit of the capacitor 51 and the excitation coil 12 is energized to the excitation coil 12, and the energization current is polar. Attenuates while inverting and reaches zero.

Accordingly, when the excitation contact 57 is closed, a damped alternating magnetic field in which the magnetic flux density gradually decreases around the excitation coil (magnetic field generating means) 12 while alternately reversing the magnetic poles with the passage of time. Generated. The magnetic field generator 35 generates a damped alternating magnetic field based on this principle. The data erasing apparatus 1 erases the magnetic data recorded on the magnetic data recording medium using the generated attenuated alternating magnetic field. That is, the magnetic field generator 35 of the data erasing apparatus 1 of the present embodiment has a function of generating a damped alternating magnetic field in which the magnetic flux density decreases as time elapses, rather than a strong magnetic field generated for a long time. Circuit.

Next, the electromagnetic wave generator 36 will be described. The electromagnetic wave generator 36 generates an electromagnetic wave by the following operation. First, the heater energizing contact 60 is closed, and the cathode (heater) 61 of the magnetron (electromagnetic wave generating means) 13 is heated. As a result, the magnetron 13 is in a state where it can emit thermoelectrons from the cathode 61. Next, when the anode energizing contact 65 is closed, the rectified output voltage of the voltage doubler rectifier circuit 62 is applied to the anode 63 of the magnetron 13, and the magnetron 13 starts to oscillate and radiates electromagnetic waves of a predetermined intensity from the antenna 66. . In this embodiment, the magnetron 13 having an oscillation frequency of approximately 4.3 GHz is used, and the electromagnetic wave radiated from the antenna 66 is a microwave having a frequency of approximately 4.3 GHz and a wavelength of approximately 7 cm.

[0067] The electromagnetic wave generator 36 generates microwaves with such a circuit configuration, and has a function of destroying data recorded by marking the generated electromagnetic waves on an optical recording medium. In the present embodiment, it is also possible to use a magnetron 13 having an oscillation frequency of approximately 1.45 GHz using a magnetron 13 having an oscillation frequency of approximately 4.3 GHz.

Next, the operation of the data erasing apparatus 1 of the present embodiment will be described along the usage procedure of the data erasing apparatus 1.

FIG. 7 is a flowchart showing an operation procedure of the data erasing apparatus shown in FIG.

The data erasing apparatus 1 of this embodiment is mainly for erasing data in a hard disk device. Remove computer hard drive 68 during processing. On the other hand, the storage unit 5 is extracted from the destruction chamber 3 of the data erasing device 1. Then, as shown in FIG. Then, the accommodating part 5 is inserted into the destruction chamber 3. The attitude of the container 5 at this time is a basic attitude as shown in FIG. 3, and the container 5 has an opening 6 provided on the front side of the destruction chamber 3 and a support 10 provided on the back wall 11. Supported by. That is, both ends of the storage unit 5 are supported and maintained in a horizontal posture.

[0069] In this state, the magnetic field generator 35 is made to function and is broken by the exciting coil (magnetic field generating means) 12. A decaying alternating magnetic field is generated in the breaking chamber 3, and at the same time, microwaves are irradiated from the magnetron (electromagnetic wave generating means) 13 into the breaking chamber 3 (step 1).

[0070] Here, in the present embodiment, the iron piece 31 is attached to the bottom of the housing portion 5, so that the iron piece 31 moves in response to the magnetic field generated by the exciting coil 12, and the housing portion 5 is moved. Move to the opening 6 side as a whole. As a result, the storage part 5 is released from the support part 10 provided on the back wall 11. Therefore, the storage part 5 loses one support, Norrance collapses, and the site | part on the back wall 11 side falls. As a result, the accommodating portion 5 is generally inclined as shown in FIG. It is recommended that the tilt posture at this time be about 30 to 60 degrees.

[0071] By the first excitation process in step 1, the data of the hard disk device 68 is erased, and the attitude of the hard disk device 68 changes.

[0072] When the first excitation process in step 1 is completed, the data erasing process is stopped (step 2).

Then continue! The second excitation process is executed (step 3). In the second excitation process, the magnetic field generator 35 is made to function, and the exciting coil 12 generates a damped alternating magnetic field in the destruction chamber 3, and at the same time, microwaves are irradiated from the magnetron 13 into the destruction chamber 3, and the node disk device. 68 data is erased again. However, in the second excitation process, the attitude of the hard disk device 68 is different from that in the first excitation process. Even magnetic fields and microwaves are prevalent. Therefore, all data in the hard disk device 68 is erased without omission.

In the above-described embodiment, the housing portion 5 is moved to disengage the support portion 10 and the posture of the housing portion 5 is changed. In other words, the relationship between the support portion 10 and the storage portion 5 is that the storage portion 5 cannot maintain a predetermined posture unless supported by the support portion 10, and the storage portion 5 is moved to engage with the support portion 10. The attitude of the accommodating part 5 was changed by solving. On the other hand, the engagement between the two may be released by moving the support portion 10 side.

FIG. 8 is a cross-sectional view of the data erasing apparatus according to the second embodiment of the present invention, in which the support unit 10 side is moved in the direction of the arrow to release the engagement with the storage unit 5.

In the embodiment shown in FIG. 8, the support 10 is responsive to the magnetic field generated by the exciting coil 12. Move to the back wall 11 side.

FIG. 9 is a cross-sectional view of the data erasing apparatus according to the third embodiment of the present invention, showing a state in which the internal hard disk device is in a basic posture. FIG. 10 is a cross-sectional view of the data erasing apparatus of FIG. 9, showing a state in which the internal hard disk device is in the second posture.

The data erasing device 70 of the present embodiment is configured by the outer box portion 2, the destruction chamber 71, and the storage portion 72 as in the previous embodiment. The outer box is the same as in the previous embodiment.

[0077] The destruction chamber 71 is a rectangular box made of a non-magnetic material as in the previous embodiment, and only one surface on the front side is open. An excitation coil 12 and a magnetron 13 are attached around the destruction chamber 71 as in the previous embodiment. The configuration, function, and circuit of the exciting coil 12 and the magnetron 13 are the same as in the previous embodiment.

The storage unit 72 employed in the present embodiment is attached inside the destruction chamber 71. That is, the storage portion 72 has a plate shape, and its central portion is pivotally supported by the destruction chamber 71 as shown in FIG. Therefore, the storage part 72 swings around the shaft 75 as in the case of a seesaw.

In addition, a sphere (support portion) 76 made of a magnetic material is provided at the lower portion of the storage portion 72. The diameter D of the sphere (supporting part) 76 is smaller than the height H of the fracture chamber 71 and the shaft 75. Therefore, the sphere (supporting part) 76 can freely roll on the bottom of the destruction chamber 71.

Next, the operation of the data erasing device 70 of the present embodiment will be described along the usage procedure of the data erasing device 70.

The data erasing apparatus of the present embodiment also erases data in the hard disk device 68. During processing, the hard disk device 68 is also removed by a computer or the like and inserted into the destruction chamber 71 as shown in FIG. That is, the hard disk device 68 is placed in the storage portion 72 provided in the destruction chamber 71.

At this time, the sphere (support part) 76 is on the rear wall 11 side of the destruction chamber 71. The node disk device 68 is inclined with the back wall 11 side facing up. Therefore, the sphere (support portion) 76 is separated from the storage portion 72, and the sphere (support portion) 76 does not support the storage portion 72.

[0080] In this state, the magnetic field generator 35 is caused to function, and the exciting coil 12 generates a damped alternating magnetic field in the destruction chamber 3, and at the same time, microwaves are irradiated from the magnetron 13 into the destruction chamber 3 (step 1). . Here, in this embodiment, since the sphere (support portion) 76 is made of a magnetic material, the sphere 76 moves to a predetermined position in response to the magnetic field generated by the exciting coil 12. To do.

As a result, the ball (support part) 76 interrupts between the bottom of the destruction chamber 71 and the storage part 72, and the ball 76 supports the storage part 72, and the attitude of the storage part 72 changes as shown in FIG. Let

When the first excitation process is completed, the data erasure process is temporarily stopped, and then the second excitation process is executed. In the second excitation process, the attitude of the hard disk device 68 has changed from that in the first excitation process. Even magnetic fields and microwaves are prevalent. Therefore, all data in the hard disk device 68 is erased without omission.

[0082] In the above-described embodiment, V, the displacement is the force by which the storage portions 5, 72, the support portion 10, and the sphere (support portion) 76 move in response to the magnetic field generated by the excitation coil (magnetic field generating means). Use these powers to move them.

FIG. 11 is a cross-sectional view of a data erasing apparatus according to the fourth embodiment of the present invention, and shows a configuration in which a support portion (rod) is moved by a solenoid 83.

That is, in the data erasing device 81 shown in FIG. 11, the storage portion 79 is pivotally supported at the tip end side and can swing around the shaft 82. In addition, a solenoid 83 is provided on the back wall 11 side of the destruction chamber 71 and below the storage portion 79, and the support portion (rod) of the solenoid 83 is in contact with the back surface of the storage portion. In the data erasing device 81 shown in FIG. 11, by energizing the solenoid 83, the support portion (rod) is expanded and contracted, and the posture of the storage portion 79 is changed. In this embodiment, a force motor exemplified by a solenoid or a cylinder may be used.

In the embodiment described above, the configuration for destroying the hard disk device has been described as an example. However, other magnetic media and optical media can also be destroyed. In addition, a configuration in which the storage unit is made larger, for example, a notebook computer can be stored in the destruction chamber as it is and the data stored in the built-in node disk device or the like can be erased.

It is also possible to adopt a configuration in which the support portion is directly brought into contact with the hard disk device or the notebook computer by omitting the storage portion.

In the above-described embodiment, both the magnetic field generating means and the electromagnetic wave generating means are provided, but V, or only one of them may be provided. In the data erasing apparatus of the above-described embodiment, the relative position of the data recording medium with respect to the magnetic field generating means or the electromagnetic generating means is changed by changing the attitude of the data recording medium itself. It is. On the other hand, in the data erasing apparatus of the fifth embodiment described below with reference to FIGS. 12 to 17, the data recording medium itself is fixed in position, and the magnetic field generating means of the data recording medium is changed by changing the attitude of the magnetic field generating means. The posture with respect to is changed relatively.

As shown in FIGS. 12 and 13, the data erasing device 101 of the fifth embodiment includes an outer box portion 102, a destruction chamber 103 and a storage portion 105, and data such as a hard disk device 68 is used. A recording medium is stored in the storage unit 105 and data is erased.

The outer box portion 102 covers the destruction chamber 103 and the storage portion 105 with an external force. An opening 109 is provided in the front wall 110 of the outer box portion 102. Further, a support member 116 for supporting the storage portion 105 is provided on the back wall 115 of the outer box portion 102. The support member 116 is an elongated rectangular parallelepiped member, and is continuous over the entire width of the back wall 115. The height of the upper end of the support member 116 is the same as the height of the lower end of the opening 109. Further, as shown in FIGS. 13 and 14 (b), through holes 108 are provided on both side surfaces of the outer box portion 102. The through hole 108 is a circular hole, and one through hole 108 is provided in the approximate center of both side surfaces.

12 and 13, the front wall 110 and the opening 109 of the outer box portion 102 are indicated by phantom lines.

The storage unit 105 has the same configuration as the storage unit 5 shown in FIGS. That is, as shown in FIGS. 12 and 13, the storage part 105 has a shape like a drawer, and has a box shape in which only the top surface is opened. The storage unit 105 includes a front wall 120, a back wall 121, a bottom wall 122, and left and right side walls 123 and 124. Further, the front wall 120 is provided with a handle 130. The shape of the front wall 120 is substantially the same as the shape of the opening 109 of the outer box portion 102.

[0088] The destruction chamber 103 is a rectangular box made of a non-magnetic material such as grease like the destruction chamber 3 in FIGS. 1 and 2, but unlike the destruction chamber 3, the front wall and the back wall It has a cylindrical shape without any. Further, as shown in FIG. 12, support shafts 107 are provided on both side surfaces of the destruction chamber 103. The support shaft 107 has a cylindrical shape, and one support shaft 107 is provided at the approximate center of both side surfaces. The diameter of the support shaft 107 is slightly smaller than the diameter of the through hole 108 of the outer box portion 102. The support shaft 107 is configured to transmit a driving force of a motor (not shown) included in the data erasing device 101. The

An excitation coil (magnetic field generating means) 12 is wound around the destruction chamber 103.

[0089] As shown in FIGS. 12, 13, and 15, the width of the storage portion 105 is slightly smaller than the width of the interior of the destruction chamber 103. Further, the height of the storage portion 105 is smaller than the height inside the destruction chamber 103. Furthermore, as shown in FIGS. 12, 13, and 16, the depth of the storage unit 105 is longer than the depth of the destruction chamber 103.

[0090] In the data erasing apparatus 101, the mutual positional relationship among the outer box part 102, the destruction chamber 103, and the storage part 105 will be described.

As shown in FIG. 16, the storage portion 105 is supported by a lower end of the opening 109 of the outer box portion 102 and a support member 116 provided on the back wall 115. In other words, the bottom wall 122 of the storage unit 105 is in contact with the lower end of the opening 109 of the outer box unit 102 and only the support member 116 provided on the back wall 115, and the support beams of the both ends supported at two points. It will be in such a support state. Further, as shown in FIG. 14A, the front wall 120 of the storage section 105 is exposed from the opening 109.

As shown in FIG. 12, the storage portion 105 is inserted into the destruction chamber 103, and the destruction chamber 103 covers the central portion of the storage portion 105. As shown in FIG. 15, the upper and lower sides and the left and right sides of the storage portion 105 are separated from the inner surface of the destruction chamber 103. The both side surfaces 123 and 124 of the storage part 105 and the inner surface of the destruction chamber 103 are only separated so as not to contact each other. On the other hand, the top surface (having an opening) of the storage unit 105 and the inner surface of the destruction chamber 103 and the bottom wall 122 of the storage unit 105 and the inner surface of the destruction chamber 103 are separated from each other by a sufficient distance.

Further, as shown in FIG. 15, the destruction chamber 103 is separated from the inner surface force of the outer casing portion 102 in the upper, lower, left and right sides. The both sides of the destruction chamber 103 and the inner surface of the destruction chamber 103 are only separated so as not to contact each other. On the other hand, the top surface of the destruction chamber 103 and the inner surface of the destruction chamber 103, and the bottom surface of the destruction chamber 103 and the inner surface of the destruction chamber 103 are separated from each other by a sufficient distance!

As shown in FIG. 15, the support shafts 107 provided on both side surfaces of the destruction chamber 103 are inserted into through holes 108 provided on both side surfaces of the outer box portion 102. The axis of the support shaft 107 and the central axis of the through hole 108 substantially coincide. For this reason, the through hole 108 functions as a bearing, and the destruction chamber 103 is swingably supported by the support shaft 107.

The electrical circuit of the data erasing device 101 is the same as the electrical circuit force shown in FIG. In other words, the electric circuit of the data erasing device 101 has a magnetic field generator 35 And a control unit 50 and a power transformer 34 for supplying AC power to these units. The function of each part is the same as that of the data erasing apparatus 1, and thus the description thereof is omitted.

The operation of the data erasing apparatus 101 of this embodiment will be described along the operation procedure of the data erasing apparatus 101.

The data erasing device 101 of the present embodiment is mainly for erasing data in the hard disk device, similarly to the data erasing device 1 of FIG. Remove the hard disk drive 68 from the computer during processing. On the other hand, the storage portion 105 is extracted from the outer box portion 102, and the hard disk device 68 is inserted as shown in FIG. Then, the accommodating portion 105 is inserted into the outer box portion 102. At this time, the accommodating portion 105 is supported by the lower end of the opening 109 provided on the front side of the outer box portion 102 and the support member 116 provided on the back wall 115, and maintains a horizontal state. On the other hand, the oscillating destruction chamber 103 is also kept horizontal as shown in FIG. 16, and this posture is the basic posture of the destruction chamber 103.

[0096] In this state, the magnetic field generator 35 is caused to function, and a damped alternating magnetic field is generated in the rupture chamber 103 by the exciting coil (magnetic field generating means) 12 (step 1). The data in the hard disk device 68 is erased by the first excitation process in step 1.

[0097] When the first excitation process in step 1 is completed, the data erasure process is stopped (step 2).

[0098] Next, a motor (not shown) that transmits a driving force to the support shaft 107 of the destruction chamber 103 is operated, so that the destruction chamber 103 is positioned as shown in FIG. 16 (a) around the support shaft 107. (Step 3). As a result, the destruction chamber 103 as a whole has an inclined posture (second posture) as shown in FIG. 16 (a), and the hard disk device 68 with respect to the exciting coil (magnetic field generating means) 12 wound around the destruction chamber 103 is obtained. The posture changes relatively.

[0099] Next, the second excitation process is executed (step 4). In the second excitation process, the magnetic field generator 35 is caused to function, and the exciting coil 12 generates a damped alternating magnetic field in the destruction chamber 103, and the data in the hard disk device 68 is erased again. However, in the second excitation process, since the attitude of the hard disk device 68 is different from that in the first excitation process, the magnetic field is also applied to the part that was shadowed during the first excitation process. Go around. Therefore, all data in the hard disk device 68 is erased without omission. [0100] When the second excitation process in step 4 is completed, the data erasure process is stopped (step 5).

[0101] Next, a motor (not shown) that transmits a driving force to the support shaft 107 of the destruction chamber 103 is operated, and the destruction chamber 103 assumes a posture as shown in FIG. 16 (b) around the support shaft 107. (Step 6). That is, in step 6, the destruction chamber 103 is tilted in the direction opposite to that in step 3. As a result, the destruction chamber 103 generally has an inclined posture (third posture) as shown in FIG. 16 (b), and the hard disk device 68 with respect to the exciting coil (magnetic field generating means) 12 wound around the destruction chamber 103 is obtained. The posture changes relatively further.

[0102] Next, the third excitation step is executed (step 7). Even in the third excitation process, the magnetic field generator 35 generates a damped alternating magnetic field in the destruction chamber 103 by the excitation coil 12, and the data in the hard disk device 68 is erased again. However, in the third excitation process, since the attitude of the hard disk device 68 is different from that in the first and second times, there is something in the first and second excitation processes. A magnetic field spreads to the shadowed area. Therefore, all data in the hard disk device 68 is erased without omission.

If necessary, return to Step 1 after Step 7 and repeat Steps 1-7.

As described above, in the data erasing apparatus 101 of the present embodiment, the basic posture (FIG. 16) and the second posture (FIG. 17 (a)) are obtained by swinging the destruction chamber 103 around the support shaft 107. ), Change posture in order of the third figure (Fig. 17 (b)).

In this embodiment, the posture of the destruction chamber 103 is changed to three postures (basic posture, second posture, and third posture), but a finer posture can also be set. For example, it is possible to further set an intermediate posture between the basic posture and the second posture or between the basic posture and the third posture, and perform the excitation process in each posture.

In this embodiment, the destruction chamber 103 is swung by the driving force of the motor, but the destruction chamber 103 may be swung by other means. For example, the destruction chamber 103 may be swung by attaching a lever to the tip of the support shaft 107 and manually operating the lever. As another example, an iron piece is attached to the bottom of the destruction chamber 103 in the same manner as the data erasing apparatus 1 in FIG. The destruction chamber 103 may be oscillated when the iron piece receives a force in response to the magnetic field generated by the magnetic coil 12.

Further, similarly to the data erasing apparatus 1 of FIG. 1, the destruction chamber 103 may be provided with a magnetron (electromagnetic wave generating means) in addition to the exciting coil (magnetic field generating means) 12.

Also in the present embodiment, the configuration for destroying the hard disk device has been described as an example. Other magnetic media and optical media can also be destroyed. Further, by making the storage unit 105 larger, for example, a notebook personal computer can be stored in the storage unit 105 as it is and the data stored in the built-in node disk device or the like can be erased.

Further, the storage unit 105 may be omitted, and a configuration in which the hard disk device or the notebook computer is kept in a horizontal state by bringing the lower end of the opening 109 into contact with the support member 116 is also possible.

[0107] Hereinafter, a sixth embodiment of the present invention will be described with reference to Figs.

A data erasing apparatus 201 shown in FIG. 18 has an outer box portion 202 formed in a rectangular box shape. An opening 204 is provided at the front center of the outer box portion 202, and an operation button is provided on the upper left thereof. 203 is provided.

The opening 204 is blocked by the front wall 207 of the tray 205 housed inside.

In the center of the front wall 207, a handle 206 protruding toward the front is provided.

As shown in FIG. 19, in the tray 205, a box-shaped outer case 208 having an open upper surface is fixed to the back side of the front wall 207. The outer case 208 is formed of a resin member (non-metallic member) in a substantially rectangular parallelepiped shape with a narrow left and right width direction extending in the front-rear direction.

[0110] The outer case 2 of the tray 205 is located inside the opening 204 (see FIG. 18) on the front side of the outer box 202.

An insertion hole 211 that allows insertion and removal of 08 is provided. This insertion hole

Around 211, an exciting coil (magnetic field generating means) 212 is arranged with the direction of the axis S in the direction in which the tray 205 is inserted. Therefore, the insertion hole 211 is provided in the axis of the exciting coil 212.

The exciting coil (magnetic field generating means) 212 can generate a magnetic force in the direction of the magnetic field G, and the magnetic force in the opposite direction can be generated.

As shown in FIGS. 20 and 21, on the inner surface side (rear surface) of the front plate 208a of the outer case 208, a buffer material 221 having a constant thickness is attached to the entire upper, lower, left and right sides. Also, the bottom plate of the outer case 208 On the inner surface side (upper surface) of 208b, a buffer material 222 having a constant thickness is adhered to the entire front, rear, left and right.

[0112] Further, on the inner surface side of the back plate 208c of the outer case 208, a support protrusion (mounting portion) 225 of a grease member (non-metallic member) that protrudes substantially horizontally toward the front slightly above the bottom portion. A buffer material 226 having a constant thickness is attached to the entire upper, lower, left, and right sides above the support protrusion 225.

[0113] The left and right side plates 208d of the outer case 208 are provided with support shafts (inner case support portions) of a grease member (non-metal member) erected on the left and right sides at approximately the center in the front-rear direction and below the center in the vertical direction. ) 2 23 is provided. Above the support shaft 223, a box-shaped inner case 233 having an open upper surface is placed. The inner case 233 is supported by a support shaft 223 and can swing in a seesaw shape.

The upper end of the support shaft (inner case support portion) 223 is configured to have the same height as the upper end of the support protrusion (mounting portion) 225. For this reason, the inner case 233 can be held substantially horizontally on the upper surfaces of the support shaft 223 and the support protrusion 225.

[0115] A regulation guide 224 formed of a U-shaped groove is provided symmetrically at the center of the inner surface of the left and right side plates 208d of the outer case 208.

[0116] The inner case 233 has a substantially rectangular parallelepiped shape that is long in the front-rear direction and narrow in the left-right width direction.

It is formed of (non-metallic member) and is sized to accommodate the hard disk device 239. Furthermore, the inner case 233 is formed larger in the front-rear direction and the vertical direction than the hard disk device 239. As a result, the hard disk device 239 can move back and forth within the inner case 233. Further, the buffer member 231 placed on the hard disk device 239 can be prevented from falling outside the inner case 233.

[0117] On the outer surfaces of the left and right side surfaces of the inner case 233, the regulation protrusions 234 are provided symmetrically in the center. The restriction protrusion 234 is fitted in the restriction guide 224, and the movement range of the inner case 233 is restricted so that the restriction protrusion 234 can move only within the restriction guide 224.

FIG. 22 is a circuit block diagram of the data erasing device of FIG. The data erasing device 201 is connected to an AC power source 245, and an operation button 203 ( An operation switch 246 is provided in conjunction with (see FIG. 18), and a rectifier circuit 244 is provided at the subsequent stage. The rectifier circuit 244 is a circuit for full-wave rectifying the AC voltage using a diode bridge or the like. Note that the rectifier circuit 244 may be provided with an appropriate power transformer or the like.

[0119] A capacitor 243 and an exciting coil (magnetic field generating means) 212 are connected in parallel to the subsequent stage of the rectifier circuit 244. The polarity reversing switch (inverts the polarity between the capacitor 243 and the exciting coil 212). Switching means) 242 and a demagnetizing switch 241 are provided. The polarity reversing switch 242 is controlled to be switched by a switching control circuit (not shown), and switches the polarity direction discharged from the capacitor 243 to the exciting coil 212 between forward and reverse. The demagnetization switch 24 1 is ONZOFF controlled by a switching control circuit and a timer circuit (not shown).

FIG. 23 is a flowchart of operations executed by the data erasing apparatus of FIG. The data erasing device 201 waits until the operation button 203 is pressed (step SI: NO). When the operation button 203 is pressed (step S1: YES), the capacitor 243 starts to be charged (step S2). .

[0121] When capacitor 243 is sufficiently charged, the timer circuit discharges the charge stored in capacitor 243 in the first direction (the direction of arrow A in FIG. 22) (step S3). Step S3 corresponds to the first magnetic field generation process. At this time, a magnetic field in the direction of arrow A shown in FIG. 20 is generated, and as shown in the explanatory diagram of FIG. 24 (a), the magnetic disk 239a in the hard disk device 239 is demagnetized by the magnetic field Ga in a portion other than the shadow area E1. Is done. In other words, since the rotation drive unit 239b is provided at the center of the magnetic disk 239a, the magnetic field does not spread sufficiently behind the rotation drive unit 239b, and the magnetic information (data) can be completely erased. A shadow region E 1 that may not be present.

Further, the hard disk device 239 made of metal receives a force from the magnetic field Ga, moves to the back side as shown in the vertical right side view of FIG. 25, and is substantially horizontal on the support shaft 223 and the support protrusion 225. Supported by For this reason, the hard disk device 239 and the inner case 233 shift from a state inclined downward by about 30 ° as shown in FIG. 20 to a substantially horizontal state as shown in FIG. The hard disk device 239 moves to the rear of the inner case 233. In addition, the position of the restriction projection 234 is from the front end of the restriction guide 224. Move to the back edge.

At this time, the back surface of the inner case 233 collides with the inner side of the back plate 208c of the outer case 208, but the shock is reduced by the cushioning material 226. Further, when the hard disk device 239 moves backward in the inner case 233, the spherical cushioning member 231 placed on the front upper part of the hard disk device 239 is formed in front of the hard disk device 239. It fits in the gap inside.

[0124] The shock absorbing member 231 is not limited to a spherical shape, and can adopt an appropriate shape. By adopting a spherical shape, the buffer member 231 has a hard disk device 239 in the inner case 233 regardless of the posture at the time of fitting. The position can be restricted so as not to move back and forth.

[0125] The voltage applied by the capacitor 243 is rapidly applied by turning on the demagnetizing switch 241, but the capacitor 243 and the exciting coil 212 constitute a resonance circuit, and therefore the current flowing through the exciting coil 212 is The damped alternating current is as shown in Fig. 6. For this reason, the magnetic field generated by the excitation coil 212 is a damped alternating magnetic field. Therefore, the area (all areas other than the shadow area E1) that received the damped alternating magnetic field in the magnetic disk 239a in the hard disk device 239 is demagnetized, and the magnetic information in that area is erased.

Subsequently, the data erasing device 201 starts charging the capacitor 243 again (step S4). When the capacitor 243 is fully charged, the switching control circuit switches the polarity inversion switch 242 to invert the polarity, and the timer circuit causes the voltage stored in the capacitor 243 to flow in the second direction (the arrow B direction in FIG. 25). (Step S5). Step S5 corresponds to the second magnetic field generation process.

At this time, a magnetic field in the direction of arrow B shown in FIG. 25 is generated, and as shown in the explanatory diagram of FIG. 24 (b), the magnetic disk 239a in the hard disk device 239 has a magnetic field in a portion other than the shadow area E2. Degaussed by Gb. Further, the hard disk device 239 made of metal is moved to the front side by the magnetic field Gb as shown in the vertical right side view of FIG. At this time, since the buffer member 231 exists, the hard disk device 239 does not move to the front side in the inner case 233, and the inner case 233 moves as a whole. The inner case 233 is softened by the shock absorbing material 221 that collides with the front plate 208a of the outer case 208.

[0128] Further, when the inner case 233 moves to the front side, the rear side end of the inner case 233 is supported. Detach from the holding protrusion 225. At this time, since the hard disk device 239 is located rearward in the inner case 233, the center of gravity is located behind the support shaft 223, and the inner case 233 is rotated downward by gravity to be about 30 degrees behind. It is supported by the support shaft 223 in a lowered state. At this time, the position of the restricting protrusion 234 is located at the central bent portion of the restricting guide 224.

Subsequently, data erasing device 201 starts charging capacitor 243 again (step S6). When the capacitor 243 is fully charged, the switching control circuit switches the polarity inversion switch 242 to reverse the polarity again to return to the initial state, and the timer circuit supplies the voltage stored in the capacitor 243 in the third direction (FIG. Discharge in the direction of arrow C (22) (Step S7). Step S7 corresponds to the third magnetic field generation process.

At this time, a magnetic field in the direction of arrow C shown in FIG. 26 is generated, and as shown in the explanatory diagram of FIG. 24 (c), the magnetic disk 239a in the hard disk device 239 has a magnetic field in a portion other than the shadow area E3. Degaussed by Gc. Further, since the hard disk device 239 made of metal moves together with the inner case 233 by the magnetic field Gc, there is a force buffer material 226, so that the impact is softened.

[0131] With the above operation, magnetic fields in three directions can be generated in order for the hard disk device 239, and magnetic information recorded on the magnetic disk 239a can be erased. The magnetic disk 239a is provided with a rotation drive unit 239b at the center because of its rotational drive structure. When a magnetic field is generated in one direction, the rotation drive unit 239b generates a shadow of the magnetic field. As a result, the magnetic field spreads through the shadow and the magnetic information can be erased with certainty. FIG. 27 is an explanatory diagram for explaining the relationship between the direction of the magnetic field and the shadow area in the magnetic disk. That is, in this embodiment, by sequentially generating magnetic fields in three directions, as shown in the explanatory diagram of FIG. 27, the area where all of the shadow areas El, E2, E3 overlap can be made zero, and the magnetic information can be stored. It can be erased reliably.

Further, in this embodiment, since the hard disk device 239 made of metal moves the hard disk device 239 using the force received by the magnetic field, the hard disk device can be simply switched between the forward and reverse directions of the generated magnetic field. The direction (angle) of the magnetic field with respect to 239 can be switched. For this reason, for example, it can be manufactured at a lower cost than when a stepping motor is provided and the angle of the hard disk device 239 is changed by a predetermined angle. In addition, since a circuit for connecting the stepping motor and a circuit for controlling the rotation angle are not required, the circuit configuration can be simplified and the cost can be reduced in this respect.

[0133] Furthermore, since the capacitor 243 cannot be charged while the current is passed through the stepping motor to change the angle! /, The erasure of magnetic information can be completed in a short time. .

In addition, it is not necessary to consider that the stepping motor and the circuit that controls the stepping motor are affected by the strong magnetic field for erasing the magnetic information of the hard disk device 239. Therefore, it is possible to simplify the design of the data erasing device 201 that does not need to be magnetically shielded with respect to the stepping motor and the circuit that controls the stepping motor, and to reduce the cost.

In the above embodiment, the range in which the inner case 233 moves in the outer case 208 is restricted by the restriction guide 224 and the restriction protrusion 234. However, the restriction guide 224 and the restriction protrusion 234 are not provided, and the degree of freedom is somewhat limited. Further, the inner case 233 may be configured to be movable.

It can also be used to erase magnetic information not only on the hard disk drive 239 but also on other data recording media such as video tape.

[0136] In addition, the AC voltage is full-wave rectified to use direct current, but the present invention is not limited to this and may be configured to use alternating current. Even in this case, the current flowing through the exciting coil (magnetic field generating means) 212 can be changed to an alternating current in which the magnetic poles are alternately switched, and the magnetic field generated by the exciting coil 212 can be changed to an alternating magnetic field in which the magnetic poles are alternately switched between forward and reverse. . If the AC voltage to be applied is gradually attenuated, the current flowing through the exciting coil 212 can be used as the damped alternating current, and the damped alternating magnetic field can be generated by the exciting coil 212.

[0137] The data erasing device 201 of Fig. 18 is provided with only a magnetic generation means, and may further include an electromagnetic wave generation means such as a magnetron.

[0138] The spherical cushioning member 231 provided in the data erasing device 201 of FIG. 18 can also be employed in the data erasing device of other embodiments. That is, the storage unit may be regarded as an inner case, and further provided with a buffer member that can be fitted between the storage unit and the data recording medium stored in the storage unit.

Claims

The scope of the claims

[1] A data erasing apparatus for erasing data recorded on a data recording medium, which is a magnetic field generating means for generating a magnetic field, or an electromagnetic wave generating means for generating an electromagnetic wave having a predetermined frequency and a predetermined intensity. A data erasing apparatus comprising: one or both of the shifts, wherein an attitude of the data recording medium with respect to either one or both of the magnetic field generating means and the electromagnetic wave generating means can be relatively changed.

2. The data erasing apparatus according to claim 1, wherein at least the attitude of the data recording medium itself can be changed.

[3] Supports a destruction chamber that is exposed to a magnetic field generated by the magnetic field generation means or an electromagnetic wave generated by the electromagnetic wave generation means, and a storage unit that is provided in the destruction chamber and stores the data recording medium itself or the data recording medium. And the support unit, the data recording medium itself, or the storage unit are movable, and the support by the support unit is released by moving these. The data erasing device according to claim 2.

[4] Supports a destruction chamber that is exposed to a magnetic field generated by the magnetic field generation means or an electromagnetic wave generated by the electromagnetic wave generation means, and a storage unit that is provided in the destruction chamber and stores the data recording medium itself or the data recording medium. A state force that can be moved by any one of the support unit, the data recording medium itself, and the storage unit, and the support by the support unit is released by the movement of the support unit. 3. The data erasing apparatus according to claim 2, wherein the data erasing apparatus changes to a supported state.

[5] Supports a destruction chamber that is exposed to a magnetic field generated by the magnetic field generation means or an electromagnetic wave generated by the electromagnetic wave generation means, and a storage unit that is provided in the destruction chamber and stores the data recording medium itself or the data recording medium. A support unit configured to move, and any one of the support unit, the data recording medium itself, and the storage unit is movable, and by moving these, the data recording medium itself or a storage unit storing the data recording medium The data erasing apparatus according to claim 2, wherein the support balance changes.

[6] At least a magnetic field generation unit is provided, and any one of the support unit, the data recording medium itself, and the storage unit is movable by the action of a magnetic field generated by the magnetic field generation unit. 6. The data erasing device according to claim 3, wherein the data erasing device is provided.

7. The data erasing apparatus according to claim 1, wherein at least one or both of the magnetic field generating means and the electromagnetic wave generating means can be changed in posture.

[8] A destruction chamber exposed to a magnetic field generated by the magnetic field generation means or an electromagnetic wave generated by the electromagnetic wave generation means while accommodating a data recording medium, and the magnetic field generation means by swinging the destruction chamber. 8. The data erasing apparatus according to claim 7, wherein the attitude of either one or both of the electromagnetic wave generating means is changed.

[9] During the data erasure process by one or both of the magnetic field generating means and the electromagnetic wave generating means, or the data erasing process by one or both of the magnetic field generating means and the electromagnetic wave generating means is performed a plurality of times. 9. The data recording medium itself, or the attitude of one or both of the magnetic field generating means and the electromagnetic wave generating means can be changed during the execution. The data erasing device described.

10. The apparatus according to claim 2, further comprising an inner case that accommodates the data recording medium and an outer case that accommodates the inner case, wherein the inner case is swingably supported by the outer case. The data erasing device described in 1.

[11] The outer case includes an inner case support portion that supports the inner case in a swingable manner, and a placement portion that can place and support one end of the inner case to hold the inner case in a substantially horizontal state. The data erasing apparatus according to claim 10, further comprising:

[12] At least an excitation coil is provided as a magnetic field generation means, and the excitation coil can generate a magnetic field in a direction from the inner case support portion to the mounting portion, and a positive voltage is applied to the excitation coil. 12. The data erasing apparatus according to claim 11, further comprising switching means capable of sequentially switching and applying a reverse voltage.

[13] The data erasure according to any one of [10] to [12], wherein the data recording medium accommodated in the inner case is used in a state of being movable along the bottom surface of the inner case. apparatus.

[14] The inner surface of the outer case and the outer surface of the outer case face each other, and a cushioning material is provided on a part or all of at least one of the inner surface and the outer surface. Item 14. A data erasing device according to any one of Items 10 to 13.

[15] The switching means sequentially executes a first magnetic field generating process for applying a voltage in the forward direction, a second magnetic field generating process for applying a voltage in the reverse direction, and a third magnetic field generating process for applying a voltage in the forward direction. 15. The data erasing apparatus according to claim 10, wherein the data erasing apparatus is possible.

16. The apparatus according to claim 16, further comprising at least an inner case that accommodates the data recording medium, and further comprising a buffer member that can be fitted between the inner case and the data recording medium accommodated in the inner case. 16. A data erasing device according to any one of 1 to 15.

[17] A data erasing method for erasing data recorded on a data recording medium, either a magnetic field generating means for generating a magnetic field or an electromagnetic wave generating means for generating an electromagnetic wave having a predetermined frequency and a predetermined intensity Using one or both, exposing the data recording medium to a magnetic field or electromagnetic waves in a plurality of positions in which the attitude of the data recording medium with respect to either or both of the magnetic field generating means and the electromagnetic wave generating means is relatively different. Characteristic data erasing method.

18. The data erasing method according to claim 17, wherein at least the attitude of the data recording medium itself is changed.

19. The data erasing method according to claim 17, wherein the attitude of at least one or both of the magnetic field generating means and the electromagnetic wave generating means is changed.

[20] During the data erasing process by one or both of the magnetic field generating means and the electromagnetic wave generating means, or the data erasing process by one or both of the magnetic field generating means and the electromagnetic wave generating means is performed a plurality of times. The data erasing method according to any one of claims 17 to 19, wherein the data erasing method is executed, and during that time, the attitude of the data recording medium itself or the attitude of one or both of the magnetic field generating means and the electromagnetic wave generating means is changed. .