JPH0737207A - Magnetic disk device - Google Patents

Abstract

PURPOSE:To enable rapid erasing without executing a computer program by bringing erasing rods embedded with electromagnets from a saving position to an operation position and connecting these rods to a power source for erasing. CONSTITUTION:An erasing supporting rod 3 of an erasing mechanism section is turned via a driver 17 to move the erasing rods 7-1 to 7-n having erasing coil parts 8 respectively embedded with the magnets from the saving position at the time of non-operation to the intermediate operating positions of corresponding disks 5-1 to 5-n at the time of erasing the disks 5-1 to 5-n for the purpose of maintaining security. Erasing current is simultaneously supplied to the coil parts 8 when the power source 2 for erasing is connected thereto via an output power source connecting connector 14, etc. As a result, the magnetic disk device capable of rapidly making erasure without executing the computer program is obtd.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic disk device for writing, reading or erasing information on a magnetic disk.

[0002]

2. Description of the Related Art FIG. 9 is a perspective view showing an example of a conventional magnetic disk device.

A conventional magnetic disk device for writing, reading, or erasing information on a magnetic disk erases the information recorded on the magnetic disk when it is no longer necessary to use the information in order to prevent leakage of confidential information. Although this must be done, a computer system is used as a means for this, as shown in FIG.

That is, as shown in FIG. 9, a program storage unit 31 storing a program that defines the operation of the system and an erasing program for erasing the information recorded on the magnetic disk, and the entire system. A computer system that includes a computer 30 that controls the operation of the computer and a display unit 32 that displays the operating state of the computer 30 is connected to the magnetic disk device 20, and the magnetic disk 25 stored in the storage box 21 by this computer system. To erase the information recorded in 1 to 25-n,
This is performed via the drive control unit 26.

This erasing operation is executed by activating the erasing program stored in the program storage unit 31 by the computer 30. When the erasing program is executed, the computer 30 causes the display unit 3
2 is displayed and the erasing data is sent to the magnetic disk device 20. Upon receiving the erasing data, the magnetic disk device 20 erases the information recorded on the magnetic disks 25-1 to 25-n by the drive control unit 26.

When the erasing of all the information recorded on the magnetic disks 25-1 to 25-n is normally completed, the magnetic disk device 20 sends a normal completion signal to the computer 30, and the computer 30 As a result, normal termination is displayed on the display unit 32, and the execution of the erasing program is terminated.

[0007]

As described above, the conventional magnetic disk device does not need to use the information recorded on the magnetic disk, and must erase the information in order to prevent leakage of confidential information. At this time, information must be erased by the computer system, but this requires a program for erasing, which has the disadvantage that it takes time to execute the program for erasing.

[0008]

A magnetic disk device of the present invention includes a magnetic disk for recording information, a drive control section for controlling information write / read operation and erasure operation for the magnetic disk, and the magnetic disk. An erasing mechanism section having an electromagnet for erasing information recorded on a disc, an erasing rod having a plurality of the electromagnets embedded therein, and an erasing support rod having a plurality of the erasing rods attached, and the erasing mechanism section. Erase power supply for supplying an erase current.

[0009]

Embodiments of the present invention will now be described with reference to the drawings.

FIG. 1 is a perspective view showing an embodiment of the present invention, FIG. 2 is a perspective view showing details of an erasing rod of the embodiment of FIG. 1, and FIG. 3 is a detailed view of an erasing mechanism portion of the embodiment of FIG. 2 is a characteristic diagram showing magnetic characteristics of the electromagnet of FIG. 2, FIG. 5 is a circuit diagram showing details of the erasing power source of the embodiment of FIG. 1, and FIG. 6 is a connection of the electromagnet of the embodiment of FIG. 7 is a circuit diagram showing the state when the erasing mechanism is in the inoperative state in the embodiment of FIG. 1, (a) is a plan view, (b) is a sectional view taken along line AA, FIG. 8A and 8B are views showing a state in which the erasing mechanism portion is in an operating state in the embodiment of FIG. 1, where FIG. 8A is a plan view and FIG.
It is a B line sectional view.

In the magnetic disk device 10 of FIG. 1, magnetic disks 5-1 to 5-n for recording information are housed in a housing box 1, and the drive control unit 16 drives the magnetic disks 5-1 to 5-1.
Controls the information write operation, read operation, and erase operation for 5-n. The storage box 1 also stores an erasing mechanism (details will be described later). The erasing power supply 2 is provided outside the storage box 1 and supplies an erasing current by connecting the output connector 14 to the power supply connector 15 provided in the storage box 1.

The erasing mechanism section includes an erasing coil section 8 and an erasing rod 7.
-1 to 7-n and the erasing support rod 3, the erasing coil section 8 stores information recorded on the magnetic disks 5-1 to 5-n as shown in FIGS. 2 and 3. Electromagnets 7a-1 to 7a-m, 7b-1 to 7b-m for erasing ...
7n-1 to 7n-m (hereinafter these are collectively referred to as electromagnet 7
And is embedded in the erasing rods 7-1 to 7-n.

As shown in FIG. 3, the erasing rods 7-1 to 7-n are arranged parallel to the side surface of the erasing supporting rod 3 and are arranged on the magnetic disk 5-1.
It is attached so that it may be located in the center between -5-n.

As shown in FIG. 1, the erasing support rod 3 is rotatably attached to the storage box 1 with its upper end and lower end supported by bearings 6a and 6b, respectively. Further, the uppermost end of the erasing support rod 3 is a rotating shaft 4 (see FIG. 3), and the upper surface of the rotating shaft 4 is exposed to the outside of the storage box 1 and can be rotated by a driver 17. An arrow-shaped groove is provided for this purpose.

The electromagnet 7 has magnetic characteristics as shown in FIG. That is, the magnetic disks 5-1 to 5-n have the residual magnetism (+ Br) 43 or the residual magnetism (-Br) 44.
When the information is recorded by, the residual magnetism (+ Br) 43 or the residual magnetism (-) is used to erase the information.
Br) 44 or the residual magnetism (+ Br) 4
3 or residual magnetism (-Br) 44 may be reversed.
Therefore, a negative magnetic field of at least a magnetic field (−Hc) 42 or more is applied to the residual magnetism (+ Br) 43, and a positive magnetic field of at least a magnetic field (+ Hc) 41 or more is applied to the residual magnetism (−Br) 44. If you apply the magnetic field of
Information on the magnetic disks 5-1 to 5-n can be erased.

As shown in FIG. 5, the erasing power supply 2 has a built-in transformer 12, and a switch 13 is provided between the input power plug 11 for inputting commercial power and the transformer 12. The output power connector 14 is connected to the power connector 15 of the storage box 1.

The electromagnet 7 is connected as shown in FIG. That is, the electromagnets 7a-1 to 7a-m and the electromagnets 7b-1 to 7b-m ......... Electromagnets 7n-1 to 7n-m
Power supply connector 1
5 are connected in parallel.

Next, the operation of the magnetic disk device configured as described above will be described with reference to FIGS. 7 and 8.

When trying to operate the erasing mechanism,
First, the input power supply plug 11 of the erasing power supply 2 is connected to a commercial power supply, the output power supply connector 14 is connected to the power supply connector 15 of the storage box 1, and the switch 13 is turned on. As a result, the transformer 12 operates, and the output power connector 1
An erasing current is supplied from 4 to the power supply connector 15. This erasing current is supplied to the electromagnet 7 via the power supply connector 15, and the electromagnet 7 becomes operable.
When the switch 13 is turned off, the commercial power supply is cut off, and the electromagnet 7 becomes inoperable.

In the initial state, as shown in FIG. 7, the erasing mechanism is located at a position distant from the magnetic disks 5-1 to 5-n and locked at that position. In this position, the switch 13 is turned off. Therefore, the erasing current is not supplied to the electromagnet 7, and the electromagnet 7 does not move to the magnetic disks 5-1 to 5-5.
It has no effect on the information recorded in -n.

When erasing the information recorded on the magnetic disks 5-1 to 5-n, as shown in FIG.
The driver 17 is inserted into the arrow-shaped groove of the rotation shaft 4 of the erasing support rod 3, and the erasing support rod 3 is rotated 90 degrees counterclockwise to be locked. As a result, the erasing rods 7-1 to 7-n also rotate 90 degrees counterclockwise and are inserted between the magnetic disks 5-1 to 5-n. When the switch 13 is turned on in this state, the erasing current is supplied to the electromagnet 7, so that the information recorded on the magnetic disks 5-1 to 5-n can be erased. When the magnetic disks 5-1 to 5-n are rotated in this state, the magnetic disks 5-1 to 5- are driven by the electromagnet 7.
The information recorded in n can be erased.

When the erasing of information is completed, the driver 17 rotates the erasing support rod 3 clockwise by 90 degrees, returns to the initial state shown in FIG.
To turn off.

[0023]

As described above, the magnetic disk device of the present invention includes an erasing mechanism section having an erasing support rod having an erasing rod embedded with an electromagnet for erasing the information recorded on the magnetic disk. , An erasing power supply for supplying an erasing current to the erasing mechanism section is provided, and when the erasing of the information is not performed, the erasing mechanism section is retracted to a position away from the magnetic disk, and the erasing of the information is performed. By moving the erasing mechanism between magnetic disks and supplying an erasing current from the erasing power supply to rotate the magnetic disks,
There is an effect that information can be erased in a short time without using an erase program.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is a perspective view showing details of an erasing rod of the embodiment of FIG.

FIG. 3 is a perspective view showing details of an erasing mechanism portion of the embodiment of FIG.

FIG. 4 is a characteristic diagram showing magnetic characteristics of the electromagnet of FIG.

5 is a circuit diagram showing details of an erasing power supply in the embodiment of FIG.

6 is a circuit diagram showing a connection of electromagnets of the embodiment of FIG.

7A and 7B are views showing a state and a state in which the erasing mechanism is in the inoperative state in the embodiment of FIG. 1, where FIG. 7A is a plan view and FIG.
Is a sectional view taken along line AA.

8A and 8B are diagrams showing a state in which the erasing mechanism is activated in the embodiment of FIG. 1, in which FIG. 8A is a plan view and FIG. 8B is a sectional view taken along line BB.

FIG. 9 is a perspective view showing an example of a conventional magnetic disk device.

[Explanation of symbols]

1.21 Storage box 2 Power source for erasing 3 Erase support rod 4 Rotating shaft 5-1 to 5-n 25-1 to 25-n Magnetic disk 6a and 6b Bearing 7-1 to 7-n Erase rod 7a-1 7a-m, 7b-1 to 7b-m ... 7n
-1 to 7 nm Electromagnet 8 Erasing coil unit 10/20 Magnetic disk device 11 Input power plug 12 Transformer 13 Switch 14 Output connector 15 Power connection connector 16/26 Drive control unit 17 Driver 30 Computer 30 Program storage unit 32 Display 41/42 Magnetic field 43/44 Remanence

Claims (1)

[Claims] 1. A magnetic disk for recording information, a drive control unit for controlling an information writing operation, a reading operation and an erasing operation for the magnetic disk, and an erasing information recorded on the magnetic disk. An erasing mechanism unit having an electromagnet, an erasing rod having a plurality of the electromagnets embedded therein, and an erasing support rod having a plurality of the erasing rods attached thereto, and an erasing power supply for supplying an erasing current to the erasing mechanism unit. A magnetic disk device characterized by the above.