TWM508775U - Dynamic low magnetic field degaussing system - Google Patents

Description

Dynamic low magnetic field degaussing system

The present invention relates to a degaussing system, and more particularly to a dynamic low magnetic field degaussing system.

At present, there are mainly two kinds of degaussing systems in the market: coil type degaussing machine and permanent magnet static magnetic field degaussing system. Referring to Fig. 1, a coil type degaussing machine, such as the Taiwan Patent No. 200511248, discloses a magnetic data erasing device 1, which mainly comprises a power circuit portion 11, a receiving portion 12, and a degaussing coil 13. The power supply circuit portion 11 is capable of generating an alternating voltage whose peak value decreases with time. The accommodating portion 12 houses a magnetic recording device (not shown). When the alternating voltage is connected to the degaussing coil 13, a magnetic field whose magnetic flux density decreases with time is caused in the accommodating portion 12, and the magnetic recording device that is statically placed in the accommodating portion 12 is eliminated by the magnetic field. The magnetic domain of the magnetic recording device. Orient HC3800SP hard disk degaussing machine is also a coil type degaussing machine.

The permanent magnet static magnetic field degaussing system uses a permanent magnet to generate a magnetic field having a strength greater than the writing magnetic field, and writes each magnetic domain in the magnetic recording device into the same magnetic polarization direction to achieve the purpose of degaussing. The MagEraSURE hard disk elimination machine such as Fujitsu on the market is this type. However, this type of degaussing system is surrounded by a strong magnetic field, which easily destroys the portable body. Used magnetic card.

According to the above description, how to avoid the use of a strong magnetic field to achieve degaussing is a difficult problem to be solved by those skilled in the art.

Therefore, the object of the present invention is to provide a degaussing system with a dynamic low magnetic field.

Therefore, the novel dynamic low magnetic field degaussing system is used for eliminating a magnetic material recorded on a magnetic device. The dynamic low magnetic field degaussing system comprises: a conveying device, a first magnetic component, and a second magnetic component.

The conveying device drives the magnetic device to move in a conveying direction.

The first magnetic component is disposed on opposite sides of the conveying device and provides a first magnetic field perpendicular to the conveying direction and having a strength between a coercive field and a writing magnetic field of the magnetic information.

The second magnetic component is disposed adjacent to the first magnetic component and provides a second magnetic field opposite to the first magnetic field and having a strength between the coercive force of the magnetic information and the written magnetic field. The first and second magnetic components can eliminate the magnetic data that is opposite to the first and second magnetic fields.

The utility model has the advantages that the magnetic device is driven by the conveying device to demagnetize the first magnetic field having a lower intensity than the writing magnetic field and the second magnetic field without using a strong magnetic field to complete degaussing.

2‧‧‧Magnetic device

21‧‧‧Magnetic information

3‧‧‧Conveyor

4‧‧‧First magnetic component

5‧‧‧Second magnetic component

X‧‧‧ conveying direction

Z ₁ ‧‧‧first magnetic field

Z ₂ ‧‧‧second magnetic field

Other features and effects of the present invention will be apparent from the following description of the drawings, wherein: FIG. 1 is an exploded perspective view showing a magnetic data erasing device disclosed in Taiwan Patent No. 200511248 Approved Publication No. 200511248; 2 is a combined schematic view showing an embodiment of the dynamic low magnetic field degaussing system of the present invention; FIG. 3 is a flow chart illustrating a degaussing method of the embodiment for eliminating a magnetic material of a magnetic device FIG. 4 is a flow chart showing the process of changing the magnetic data.

Before the present invention is described in detail, it should be noted that in the following description, similar elements are denoted by the same reference numerals.

Referring to FIG. 2, an embodiment of the dynamic low magnetic field degaussing system of the present invention is used to eliminate a magnetic material 21 recorded on a magnetic device 2. The magnetic device 2 can be a stand-alone hard disk or a computer with a built-in magnetic recording device. In the embodiment, the independent hard disk is described as an example, but not limited thereto. In Fig. 2, the magnetic device 2 and the magnetic material 21 are represented by imaginary lines.

The degaussing system comprises a conveying device 3, a first magnetic component 4, and a second magnetic component 5.

The conveying device 3 drives the magnetic device 2 to move along a conveying direction X, and sequentially passes the first magnetic component 4 and the second magnetic component 5. Preferably, the conveying device 2 can be a slide rail or a conveyor belt, and the spatial distribution thereof can be open or closed. In this embodiment, the open rail is For example, but not limited to this.

The first magnetic component 4 is disposed on opposite sides of the conveying device 3 and provides a first magnetic field Z ₁ perpendicular to the conveying direction X and having an intensity between the coercive force of the magnetic information 21 and the writing magnetic field. In general, the magnetic field 21 has a write magnetic field of about 1.3 to 1.4 Tesla, and the magnetic information 21 has a coercive force of about half the write magnetic field.

The second magnetic component 5 is disposed adjacent to the first magnetic component 4 and provides a second magnetic field Z opposite to the first magnetic field Z ₁ and having a strength between the coercive force of the magnetic information 21 and the writing magnetic field. ₂ .

Preferably, the first magnetic component 4 and the second magnetic component 5 may be selected from permanent magnets or electromagnets, and may be the same or different. In the embodiment, the first and second magnetic components 4 and 5 are respectively exemplified by a pair of permanent magnets.

Referring to Figures 3 and 4, the following steps are used to illustrate the method of degaussing using the novel degaussing system.

Step (a) prepares a degaussing system as described above.

Step (b) using the transport device 3 to move the magnetic device 2 from an initial position along the transport direction X and stay in the first magnetic field Z ₁ provided by the first magnetic component 4, by the first magnetic field Z ₁ eliminates the magnetic data 21 that is opposite to the first magnetic field Z ₁ . Since the intensity of the first magnetic field Z ₁ is between the coercive force and the write magnetic field of the magnetic information 21, the first magnetic field Z ₁ resets the magnetic data 21 opposite to the first magnetic field Z ₁ . It is in the state of no magnetic signal.

The step (c) uses the conveying device 3 to move the magnetic device 2 along the conveying direction X and stay in the second magnetic field Z ₂ provided by the second magnetic component 5. By eliminating the second magnetic field Z ₂ Z ₂ opposite the magnetic material 21 and the second magnetic field. Since the intensity of the second magnetic field Z ₂ is between the coercive force and the write magnetic field of the magnetic information 21, the second magnetic field Z ₂ resets the magnetic data 21 that is opposite to the second magnetic field Z ₂ to be Magnetic signal status.

In addition, a step (d) may be further included after the step (c). In this step (d), the transport device 3 redirects the magnetic device 2 back to the initial position. However, this step can also be omitted if the magnetic device 2 does not have to be redirected back to the initial position.

Specifically, when the magnetic device 2 sequentially passes the first magnetic component 4 and the second magnetic component 5, the degaussing system can eliminate the magnetic material 21 reversed from the first and second magnetic fields. Since the intensity of the first magnetic field Z ₁ and the second magnetic field Z ₂ only needs to be between the coercive force and the write magnetic field of the magnetic information 21, unlike the conventional permanent magnet static magnetic field degaussing system, the writing needs to be exceeded. The strength of the magnetic field, so the present invention can use a lower magnetic field strength for the purpose of degaussing.

Referring to Annex 1 and Annex 2, in order to further confirm that the embodiment can be demagnetized by using a low magnetic field, magnetic force microscopy is used to detect before degaussing (as shown in Annex 1) and after degaussing (as shown in Annex 2). The magnetic domain signal of the magnetic data 21.

See Annex 2 and 3 with the first magnetic field strength of 0.7 Tesla, the second magnetic field strength of 0.7 Tesla, and the magnetic means 2 to the first magnetic field Z residence time is at least ₁ second, The magnetic device 2 stays at the second magnetic field Z ₂ for at least one second. It can be clearly seen from Annex 2 that the magnetic patterns periodically arranged before degaussing are displayed as non-magnetic signals after degaussing, so it can be confirmed that the degaussing system of the present invention can be demagnetized by using a low magnetic field.

In summary, the dynamic low magnetic field degaussing system of the present invention drives the magnetic device 2 to the first magnetic field Z ₁ having a strength between the coercive force and the write magnetic field of the magnetic information 21 and the first magnetic field The magnetic field Z ₂ demagnetizes without using a strong magnetic field degaussing, and the magnetic device 2 after degaussing can be reused due to the use of low magnetic field degaussing, so the purpose of the present invention can be achieved.

However, the above is only the embodiment of the present invention, and when it is not possible to limit the scope of the present invention, all the simple equivalent changes and modifications according to the scope of the patent application and the contents of the patent specification are still This new patent covers the scope.

2‧‧‧Magnetic device

21‧‧‧Magnetic information

3‧‧‧Conveyor

4‧‧‧First magnetic component

5‧‧‧Second magnetic component

X‧‧‧ conveying direction

Z ₁ ‧‧‧first magnetic field

Z ₂ ‧‧‧second magnetic field

Claims (3)

A dynamic low magnetic field degaussing system for eliminating magnetic data recorded on a magnetic device, the dynamic low magnetic field degaussing system comprising: a conveying device for driving the magnetic device to move along a conveying direction; a first magnetic component, And disposed on opposite sides of the conveying device, and providing a first magnetic field perpendicular to the conveying direction and having a strength between the coercive force and the writing magnetic field of the magnetic information; and a second magnetic component, and the first The magnetic components are disposed adjacent to each other and provide a second magnetic field opposite to the first magnetic field and having a strength between the coercive force of the magnetic information and the writing magnetic field; wherein the first and second magnetic components can be eliminated The magnetic data of the first and second magnetic fields are reversed. The dynamic low magnetic field degaussing system of claim 1, wherein the first magnetic component and the second magnetic component are respectively a pair of permanent magnets or a pair of electromagnets. The dynamic low magnetic field degaussing system of claim 2, wherein the conveying device is a track or a conveyor belt.