JPH0414603A - Magnetic information erasure device - Google Patents

Abstract

PURPOSE:To confirm erasure while magnetic information is being erased by providing a magnetic recording film on a magnetic tape adhered thereto. CONSTITUTION:A magnetic recording film 2 is formed by arranging and vapor- depositting spicular magnetic powder onto a vinyl group film, the magnetic powder is moved depending on the direction of a magnetic line of force and when a magnetic field is changed, the surface pattern is changed. In the case of erasing magnetic information on a tape 1 whose recording is not in use any more, at first the recording film 2 is adhered onto the tape 1 by its own magnetic force and the tape is loaded to an arm 9 and inserted in the center of a magnetic information erasure 10. When the tape 1 and the recording film 2 are driven simultaneously, the magnetic information of the tape 1 is erased by the magnetic field of a magnetic pole 5, the behavior is transferred onto the recording film 2 thereby attaining confirmation by visual observation.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic information erasing device, and more particularly to a magnetic information erasing device for erasing magnetic information recorded on a magnetic tape.

[Prior Art] In recent years, magnetic tapes have been widely used for exchanging information both inside and outside of companies, and it is natural to dispose of used magnetic tapes or to erase and reuse information that is no longer needed. etc. are being carried out. However, it is conceivable that the information from the discarded magnetic tape may be retrieved and leaked by a third party, or that the previous information may remain unerased and errors may occur in the newly added information. Therefore, it is desirable that information be completely erased whether it is discarded or reused.

Generally, when erasing a magnetic tape, a computer is operated to continuously add zero information and erase unnecessary information. Furthermore, magnetic information may be erased using a combination of powerful electromagnets, as described in Japanese Patent Laid-Open No. 63-312605.

[Problem to be solved by the invention] Conventional magnetic information erasing devices were configured as described above, so when adding new meaningless zero information using a computer, although it increases certainty, it takes time and effort. Furthermore, when erasing with an electromagnet, it is not possible to confirm that the data has been erased reliably, even though the data can be erased in a short time. In either case, to check whether the magnetic information has been erased or not, the magnetic tape must be run again to check, which results in wasted time.6 The object of the present invention is to To provide a magnetic information erasing device capable of erasing magnetic information in a short time while confirming that the magnetic tape has been erased.

[Means for Solving the Problems] In order to achieve the above object, the present invention is characterized in that a magnetic recording film is provided on a magnetic tape so as to correspond to the magnetic field of at least one magnetic pole.

Further, the present invention is characterized in that, in addition to the above-described configuration, a magnetic field adjuster is provided that can change the strength of the magnetic field into at least two types.

[Function] Since the magnetic information erasing device according to the present invention is configured as described above, by attaching a magnetic recording film whose surface pattern changes depending on the change in the magnetic field to the magnetic tape, it is possible to confirm the magnetic information while erasing it. be able to.

Furthermore, since the strength of the magnetic field can be varied by a magnetic field regulator, a desired mark can be placed on the item, making it easy to determine whether the item is to be discarded or reused.

As a result, magnetic information can be erased in a very short time and can be confirmed at the same time, so there is no need to add zero information to the computer while erasing it, or to run the erased magnetic tape again to confirm it. The time it takes to do this can be significantly reduced.

[Example] An example of the present invention will be described below with reference to FIGS. 1 to 4.

FIG. 1 is a perspective view showing the overall configuration of a magnetic information erasing device.
There is a pair of electromagnetic coils 3 that generate a demagnetizing magnetic field, a magnetic closed circuit piece 4 that constitutes an open circuit of a strong magnetic field is provided on the outside thereof, and a pair of magnetic pole pieces 5 that generate a magnetic field space is provided on the inside thereof. . Arm 9 between this magnetic pole piece 5
1, the sole of the magnetic tape 1 to which the magnetic recording film 2 is attached is held. The magnetic field adjustment device 11 also includes a voltage regulator 6 for supplying power to the electromagnetic coil 3, a button switch 8 for changing the polarity of the magnetic pole or applying an erasing mark, and a controller 7 containing a rectifier. It is provided.

The magnetic recording film 2 used here is a vinyl-based film on which acicular magnetic particles are deposited in an aligned manner, and is formed so that the acicular magnetic particles move depending on the direction of the magnetic lines of force.
As the magnetic field changes, the pattern on the surface changes.

Used magnetic tape used in computers, etc.
If you want to erase the magnetic information on the magnetic tape 1, first attach the magnetic recording film 2 to the magnetic tape 1 by its own magnetic force and attach it to the arm 9, and as shown in the front view of FIG.
Interpolate at the center of 0.

The voltage regulator 6 was adjusted in advance to the magnetic field strength determined by the type of magnetic tape, and the magnetic pole pieces 5 were strongly magnetized to N and S by the direct current rectified by the chondral rough. When the magnetic tape 1 and the magnetic recording film 2 are rotated simultaneously in this state, magnetic information is erased by a strong magnetic field of 3000 to 5000 Gauss near the magnetic pole piece 5, and the situation is reflected on the magnetic recording film 2 and visually observed. It can be confirmed by

Here, the circuit diagram of the controller 7 shown in FIG. 4 will be explained. A voltage regulator 6 having a fuse F and a switch S1 at both ends supplies voltage to a rectifier SD consisting of four diode elements. A button switch 8 is provided between the rectifier SD and the coils L and L2 of the electromagnetic coil 3 to reverse the current flow.

Using this circuit, it is possible to leave a mark indicating the state of demagnetization and the fact that it has been demagnetized. That is, when the button switch 8 of the controller 7 is turned on, the circuit shown in the lower part of the figure is formed, and the coil L1 of the electromagnetic coil 3 is turned on. A current flows in the opposite direction to L, and the magnetic pole piece 5
acts with opposite polarity. Therefore, as shown in FIG. 3, the erasing mark remains on the surface of the magnetic recording film 2 only when the button switch 8 is turned on. Here, if there are two marks, it is for disposal, and if there are four marks, it is for reuse, etc., and can be easily distinguished.

Although a pair of magnetic pole pieces 5 are used in this embodiment, the magnetic circuit may be constructed using only one side, or a permanent magnet may be used instead of an electromagnet to change the strength of the magnetic field. You may also do so.

[Effects of the Invention] As explained above, since the present invention uses a magnetic recording film, it is possible to confirm erasure while erasing magnetic information. It eliminates the need to re-run, significantly saving time and
You can reduce expenses.

Further, since a magnetic field adjuster is provided, a desired mark can be placed on the magnetic field recording film, and it is possible to easily distinguish whether it is for reuse or disposal.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a magnetic information erasing device according to an embodiment of the present invention, and FIG. 2 is a front view showing the main parts thereof. FIG. 3 is a perspective view showing an example of recording on a magnetic recording film, and FIG. 4 is a circuit diagram mainly showing the circuit within the controller. DESCRIPTION OF SYMBOLS 1... Magnetic tape, 2... Magnetic recording film, 3... Electromagnetic coil, 5... Magnetic pole piece, 10... Magnetic information Eraser, 11...
...Magnetic field adjuster. Figure 2 Figure 3 1...K Hill Poor 7゛2 ・Nshiba IJ No. i? 4 = L moon lol 3... child, m] Ujshi 5... Super" Kaji-su 10. Le 6 member information drop 1 11-...Lh dark look atmosphere

Claims (1)

[Scope of Claims] 1. In a magnetic information erasing device that arranges a magnetic tape near the magnetic field of at least one magnetic pole and erases information on the magnetic tape by the magnetic field, the magnetic A magnetic information erasing device characterized by having a magnetic recording film attached to a tape. 2. The magnetic information erasing device according to claim 1, further comprising a magnetic field adjuster capable of changing the strength of the magnetic field into at least two types.