JPH04328302A - Magnetic data eraser - Google Patents

Abstract

PURPOSE:To obtain the magnetic data eraser for rapidly erasing magnetic information recorded on a magnetic tape. CONSTITUTION:The subject device is featured by disposing permanent magnets 1A and 1B opposite to each other underneath a rotary round table 6 to be placed with a magnetic tape recorded with the magnetic information on the center side and on the outer circumferential side respectively and providing a magnetic recording film 10 having acicular magnetic powder 11 sensible to magnetism above the magnetic tape. The time and expenditure can thus be reduced at the time of erasing the magnetic information of the magnetic tape.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic data erasing device, and more particularly to a magnetic data erasing device for erasing magnetic information recorded on a magnetic tape.

0002

[Prior Art] In recent years, magnetic media such as magnetic tapes and floppy disks have been widely used for exchanging information data inside and outside companies. Information is erased and reused. However, during the disposal process, the information on the magnetic media may be extracted by a third party, or even though the magnetic information has been erased, some information may remain and be mixed with newly recorded information. There are concerns.

Conventionally, as a means to solve the above-mentioned problems, there has been a method of erasing magnetic information recorded on a magnetic tape by continuously adding zero information to the magnetic tape through computer processing.

0004

[Problems to be Solved by the Invention] In the above-mentioned conventional technology, since zero information is continuously added to the magnetic tape by computer processing, the magnetic information on the magnetic tape can be reliably erased. There was a problem in that it required a lot of time and effort.

The present invention has been made in view of the actual situation in the prior art, and its purpose is to provide a magnetic data erasing device that can quickly erase magnetic information recorded on a magnetic tape. be.

[0006]

[Means for Solving the Problems] In order to achieve this object, the present invention includes a rotary round table on which a magnetic tape on which magnetic information is recorded is placed, and a rotary round table provided near the rotary round table for erasing the magnetic information. In the magnetic data erasing device having a permanent magnet, a plurality of the permanent magnets are arranged facing each other at the lower part of the center side and the outer peripheral side of the rotary round table.

[0007]

[Operation] In the present invention, as described above, a plurality of permanent magnets are arranged facing each other at the lower part of the center side and the outer peripheral side of the rotary round table, so that the center part of the magnetic tape is placed in the magnetic field of one of the permanent magnets. At the same time, the outer circumference of the magnetic tape is placed in the magnetic field of the other permanent magnet to erase the magnetic information on the outer circumference, thereby erasing the magnetic information recorded on the magnetic tape. can be erased quickly.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the magnetic data erasing device of the present invention will be described with reference to the drawings. 1 is a perspective view showing an embodiment of the magnetic data erasing device of the present invention, FIG. 2 is a perspective view showing a magnetic tape on which data is erased by the magnetic data erasing device of FIG. 1, and FIG. 3 is a perspective view showing the magnetic data erasing device of FIG. FIG. 4 is a perspective view showing a state in which the erasing device is in operation. FIG. 4 is a perspective view showing a magnetic recording film provided in the magnetic data erasing device of FIG.

The magnetic data erasing device of this embodiment shown in FIG. 1 includes a pair of permanent magnets 1A and 1B that are built into a housing 1 and generate an erasing magnetic field, and are provided at the bottoms of these permanent magnets 1A and 1B. A magnetic field closing piece 2 that forms a closed circuit of a strong magnetic field, a motor 4 that is rotated by the current of a battery 3, a movement button 5 that performs on/off control of this motor 4, and a rotatable magnet located above the permanent magnets 1A and 1B. A rotary round table 6 is placed in the rotary table 6 and driven by a motor 4, a magnetic leakage prevention cover 7 provided on the upper part of the main body 1, and a magnetic tape for computers etc. placed on the rotary round table 6 as shown in FIG. 8, a magnetic recording film 10 provided on the protective case 9, and the like.

The magnetic recording film 10 is made of a vinyl disc-shaped film, and on the surface of this disc-shaped film, magnetic recording means sensitive to magnetism, for example, needle-shaped magnetic particles 11 that move according to the direction of magnetic lines of force, are deposited in an aligned manner. ing. The shape of the magnetic pattern formed by the acicular magnetic particles 11 changes according to changes in the magnetic field. In addition, permanent magnets 1A and 1B
are arranged facing each other at the lower part of the center side and the outer peripheral side of the rotary round table 6, one permanent magnet 1A demagnetizes the center of the rotary round table 6, and the other permanent magnet 1B demagnetizes the rotary round table 6. They are assigned to demagnetize the outer periphery of the

In this embodiment, when erasing magnetic information on a magnetic tape 8 used in a computer or the like, the magnetic tape 8 is placed on a rotating round table 6 and covered with a protective case 9.
After placing the magnetic recording film 10 on the protective case 9, the motor 4 is operated by operating the movement button 5, and the rotary round table 6 is rotated. As a result, while the magnetic tape 8 rotates, the permanent magnet 1 demagnetizes the center and outer circumference of the magnetic tape 8.
A and 1B, and the acicular magnetic particles 11 of the magnetic recording film 10 placed on the magnetic tape 8 via the protective case 9 are sensitive, and the shape of the magnetic pattern formed by the acicular magnetic particles 11 changes. Change.

In the embodiment configured as described above, permanent magnets 1A and 1B are installed at the lower part of the center side and the outer peripheral side of the rotary round table 6.
are arranged facing each other, the rotary round table 6 is 18
Even when the magnetic tape 8 is rotated by 0 degrees, the magnetic information recorded on the magnetic tape 8 can be erased, and this data erasure can be performed quickly. In addition, since the shape of the magnetic pattern formed by the acicular magnetic particles 11 on the magnetic recording film 10 changes at this time, it is possible to visually observe the shape of the magnetic pattern of the acicular magnetic particles 11 while erasing the magnetic information on the magnetic tape 8. Data deletion can be confirmed, and the effort and time required to confirm data deletion can be reduced. Note that in this embodiment, while erasing magnetic information on the magnetic tape 8, the magnetic recording film 10
Although the case where data erasure is confirmed by the above-described example is shown, it is also possible to confirm whether or not magnetic information is recorded on the magnetic tape 8 using the magnetic recording film 10 before performing such data erasure.

[0013]

Since the present invention is constructed as described above, magnetic information recorded on a magnetic tape can be quickly erased, and therefore, the time and expense required for erasing data can be reduced. Furthermore, when a magnetic recording film is provided, data erasure can be confirmed while erasing magnetic information on the magnetic tape, and the time and expense required for data erasure can be further reduced.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an embodiment of a magnetic data erasing device of the present invention.

FIG. 2 is a perspective view showing a magnetic tape on which data is erased by the magnetic data erasing device of FIG. 1;

FIG. 3 is a perspective view showing the magnetic data erasing device of FIG. 1 in an operating state.

4 is a perspective view showing a magnetic recording film included in the magnetic data erasing device of FIG. 1. FIG.

[Explanation of symbols]

1A, 1B Permanent magnet 6 Rotating round table 8 Magnetic tape 10 Magnetic recording film 11 Acicular magnetic powder (magnetic recording means)

Claims (2)

[Claims] 1. A magnetic data erasing device comprising: a rotating round table on which a magnetic tape for recording magnetic information is placed; and a permanent magnet provided near the rotating round table for erasing the magnetic information; A magnetic data erasing device characterized in that a plurality of the above-mentioned permanent magnets are arranged facing each other at the lower part of the center side and the outer peripheral side. 2. The magnetic data erasing device according to claim 1, further comprising a magnetic recording film having magnetic recording means sensitive to magnetism provided near the magnetic tape.