Magnetic medium performance detection device and magnetic medium performance detection method

Abstract

The invention provides a magnetic medium performance detection device and method, and the device comprises a rotating assembly which is used for driving a magnetic medium to rotate; the magnetizing assembly is located on the outer side of the rotating circumference of the rotating assembly, and the magnetizing assembly is used for generating a plurality of magnetizing fields with different magnetic field intensities, so that when the magnetic medium rotates to the magnetizing range of the magnetizing assembly, the magnetizing assembly quantitatively magnetizes the magnetic medium; the detection assembly is located on the outer side of the rotating circumference of the rotating assembly, the detection assembly and the magnetization assembly are arranged at intervals, and when the magnetic medium rotates to the detection range of the detection assembly, the detection assembly quantitatively detects the performance of the magnetic medium and generates a detection signal; in each rotating period of the rotating assembly, the magnetic medium is magnetized by the magnetizing assembly and detected by the detecting assembly in sequence, so that one-time quantitative magnetization of the magnetizing assembly and one-time quantitative detection of the detecting assembly are completed. The problem that in the prior art, nondestructive quantitative detection cannot be carried out on the performance of the magnetic medium is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of magnetic medium performance detection, and in particular to a magnetic medium performance detection device and a magnetic medium performance detection method. Background Art

[0002] Magnetic media is an important information recording medium. Magnetic media such as magnetic tapes and magnetic stripes play an important role in the field of information storage. Among the many properties of magnetic media, coercivity is an important part of magnetic media performance testing. The national standards "Identification Card Recording Technology Part 2: Magnetic Stripe-Low Coercivity" and "Identification Card Recording Technology Part 6: Magnetic Stripe-High Coercivity" clearly define the coercivity performance standards of magnetic stripe magnetic media. The traditional method for testing the coercivity performance of magnetic media is to use a vibrating sample magnetometer or ferromagnetometer for testing. Due to the limitations of the instrument's measurement principle, this method requires cutting the magnetic media. Generally, it needs to be cut into less than 5 mm before it can be placed in the sample rod for quantitative testing. It is impossible to perform non-destructive testing of large-area magnetic media or magnetic media.

[0003] Patents CN201180027867, CN201780016531, etc. propose devices and methods for multiple magnetization of magnetic media by permanent magnets to determine the coercive force characteristics of magnetic media. Although non-destructive detection of the coercive force characteristics can be performed without destroying the magnetic medium, these methods can only make qualitative detection of the coercive force of the magnetic medium, and cannot perform quantitative detection of the coercive force characteristics of the magnetic medium, let alone obtain the accurate value of the coercive force of the magnetic medium.

[0004] That is to say, there is a problem that the magnetic medium performance detection in the prior art cannot be carried out in a non-destructive and quantitative manner. Summary of the invention

[0005] The main purpose of the present invention is to provide a device and method for detecting magnetic medium performance, so as to solve the problem that magnetic medium performance detection in the prior art cannot be quantitatively detected non-destructively.

[0006] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, a device for detecting the performance of a magnetic medium is provided, comprising: a rotating component, the rotating component is used to drive the magnetic medium to rotate; a magnetizing component, the magnetizing component is located outside the rotating circumference of the rotating component, the magnetizing component is used to generate a plurality of magnetizing fields with different magnetic field strengths, so that when the magnetic medium rotates to the magnetization range of the magnetizing component, the magnetizing component quantitatively magnetizes the magnetic medium; a detection component, the detection component has no built-in magnetic field, the detection component is located outside the rotating circumference of the rotating component and is spaced apart from the magnetizing component, when the magnetic medium rotates to the detection range of the detection component, the detection component quantitatively detects the performance of the magnetic medium and generates a detection signal; wherein, in each rotation cycle of the rotating component, the magnetic medium is successively magnetized by the magnetizing component and detected by the detection component, so as to complete a quantitative magnetization of the magnetizing component and a quantitative detection of the detection component.

[0007] Furthermore, in different rotation periods of the rotating assembly, the magnetic field strength of the magnetizing field is different, so that the magnetic medium has different magnetization states under the influence of the coercive force magnetic property.

[0008] Furthermore, the rotating assembly includes a rotating cylinder, the magnetic medium is arranged on the surface of the rotating cylinder, and the magnetization assembly is arranged at a distance from the rotating cylinder.

[0009] Furthermore, the magnetic medium is adhered to the surface of the rotating cylinder.

[0010] Furthermore, the surface of the rotating drum has an adsorption area, and the adsorption area has a plurality of adsorption holes, and the air inside the rotating drum is extracted to allow the magnetic medium to be adsorbed on the adsorption area.

[0011] Furthermore, the rotating drum rotates at a uniform speed.

[0012] Furthermore, the detection component includes a coil-type inductive head magnetic sensor; or the detection component includes a TMR magnetoresistive element, and the TMR magnetoresistive element has no built-in magnetic steel.

[0013] Further, the magnetizing assembly includes an electromagnet.

[0014] Furthermore, the magnetizing field is less than or equal to 10000 Oe.

[0015] According to another aspect of the present invention, a method for detecting the performance of a magnetic medium is provided, using the above-mentioned device for detecting the performance of a magnetic medium, including: magnetizing the magnetic medium, and generating a detection signal through a detection component of the device for detecting the performance of the magnetic medium; judging the magnetization state of the magnetic medium by monitoring the change pattern of the detection signal; and determining the coercive force magnetic properties of the magnetic medium based on the magnetization state and the detection signal.

[0016] Furthermore, in the process of magnetizing the magnetic medium and generating a detection signal through the detection component of the magnetic medium performance detection device, if the amplitude of the detection signal changes gradually, it is judged that the magnetic medium is in a forward magnetization state; if the amplitude of the detection signal remains unchanged, it is judged that the magnetic medium is in a saturation magnetization state; if the amplitude of the detection signal changes gradually, it is judged that the magnetic medium is in a reverse magnetization state.

[0017] Furthermore, in the process of determining the coercive force magnetic properties of the magnetic medium according to the magnetization state and the detection signal, if the magnetic medium changes from the forward magnetization state to the saturation magnetization state, the critical magnetization field of the magnetized magnetic medium is judged to be the saturation coercive force magnetization field; if the magnetic medium is in the reverse magnetization state and the amplitude of the detection signal is zero, the critical magnetization field of the magnetized magnetic medium is judged to be the residual coercive force magnetization field.

[0018] Furthermore, in the process of magnetizing the magnetic medium and generating a detection signal through a detection component of a detection device for detecting the properties of the magnetic medium, the magnetization component of the detection device is controlled to generate a magnetization field with a magnetic field strength that changes monotonically at intervals.

[0019] Furthermore, in the process of magnetizing the magnetic medium and generating a detection signal through a detection component of a device for detecting properties of the magnetic medium, the magnetic field strength of the magnetizing field increases in a positive direction.

[0020] Furthermore, the method for detecting the performance of magnetic media also includes a first preprocessing step before magnetizing the magnetic medium and generating a detection signal through a detection component of the detection device for detecting the performance of the magnetic medium. The first preprocessing step includes: demagnetizing the magnetic medium; and after the first preprocessing step is completed, in the process of magnetizing the magnetic medium and generating a detection signal through a detection component of the detection device for detecting the performance of the magnetic medium, the magnetic field strength of the magnetization field is controlled to increase in the positive interval by controlling the state of the magnetization component.

[0021] Furthermore, in the process of magnetizing the magnetic medium and generating a detection signal through a detection component of a device for detecting the properties of the magnetic medium, the magnetic field intensity of the magnetizing field increases at a reverse interval.

[0022] Furthermore, the method for detecting the performance of magnetic media also includes a second preprocessing step before magnetizing the magnetic medium and generating a detection signal through a detection component of the detection device for detecting the performance of the magnetic medium. The second preprocessing step includes: saturation magnetizing the magnetic medium; and after the second preprocessing step is completed, in the process of magnetizing the magnetic medium and generating a detection signal through a detection component of the detection device for detecting the performance of the magnetic medium, the magnetic field strength of the magnetizing field is controlled to increase the reverse interval by controlling the state of the magnetization component.

[0023] Furthermore, the method for detecting the performance of the magnetic medium at least includes: step S11: controlling the magnetization field to be located at the initial magnetic field strength, and recording; step S12: controlling the rotating cylinder of the rotating component of the magnetic medium performance detection device to rotate one circle, so that the magnetic medium passes through the magnetization range and the detection range successively, and recording the detection signal; step S13: controlling the magnetic field strength of the magnetization field to change once, and recording; step S14: repeating steps S12 and S13 until the amplitude of the detection signal remains unchanged or the amplitude of the detection signal is reduced to zero.

[0024] By applying the technical solution of the present invention, the device for detecting the performance of a magnetic medium can generate a magnetizing field for quantitative magnetization of the magnetic medium 40. The magnetic medium 40 will be magnetized to different states according to the different coercive force magnetic properties. The detection component 30 of the device for detecting the performance of a magnetic medium can quantitatively detect the signal size of the magnetic medium, thereby realizing the quantitative detection of the coercive force magnetic properties of the magnetic medium. The method for detecting the performance of a magnetic medium provided by the present invention does not require the destruction of the magnetic medium 40 for sampling during the detection process, and is suitable for non-destructive detection of the performance of a large area of ​​magnetic medium 40, and has great advantages over the current destructive sampling method for detecting the performance of a magnetic medium. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0026] Figure 1 A schematic diagram showing the structure of a device for detecting magnetic medium properties according to an optional embodiment of the present invention;

[0027] Figure 2 A schematic flow chart showing a method for detecting magnetic medium performance according to any optional embodiment of the present invention;

[0028] Figure 3 A partial schematic flow chart showing a method for detecting magnetic medium performance according to an optional embodiment of the present invention;

[0029] Figure 4 A schematic diagram showing changes in a detection signal according to the first embodiment of the present invention is shown;

[0030] Figure 5 A schematic diagram showing changes in the detection signal of the second embodiment of the present invention is shown.

[0031] The above drawings include the following reference numerals:

[0032] 10. Rotating assembly; 11. Rotating cylinder; 20. Magnetizing assembly; 30. Detecting assembly; 40. Magnetic medium. DETAILED DESCRIPTION

[0033] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0034] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meanings as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0035] In the present invention, unless otherwise specified, the directional words used, such as "up, down, top, bottom", usually refer to the directions shown in the drawings, or to the components themselves in the vertical, perpendicular or gravity directions; similarly, for ease of understanding and description, "inside and outside" refer to the inside and outside relative to the outline of each component itself, but the above-mentioned directional words are not used to limit the present invention.

[0036] In order to solve the problem that the magnetic medium performance detection in the prior art cannot be performed non-destructively, the present invention provides a magnetic medium performance detection device and a magnetic medium performance detection method.

[0037] like Figures 1 to 5 As shown, the detection device for the performance of a magnetic medium includes a rotating component 10, a magnetizing component 20 and a detection component 30, wherein the rotating component 10 is used to drive the magnetic medium 40 to rotate; the magnetizing component 20 is located outside the rotating circumference of the rotating component 10, and the magnetizing component 20 is used to generate a plurality of magnetizing fields with different magnetic field strengths, so that when the magnetic medium 40 rotates to the magnetization range of the magnetizing component 20, the magnetizing component 20 quantitatively magnetizes the magnetic medium 40; the detection component 30 has no built-in magnetic field, the detection component 30 is located outside the rotating circumference of the rotating component 10 and is spaced apart from the magnetizing component 20, and when the magnetic medium 40 rotates to the detection range of the detection component 30, the detection component 30 quantitatively detects the performance of the magnetic medium 40 and generates a detection signal; in each rotation cycle of the rotating component 10, the magnetic medium 40 is successively magnetized by the magnetizing component 20 and detected by the detection component 30, so as to complete a quantitative magnetization of the magnetizing component 20 and a quantitative detection of the detection component 30.

[0038] By placing the magnetic medium 40 on the rotating component 10 and rotating with the rotating component 10, the magnetic medium 40 can pass through the magnetization range multiple times and be subjected to multiple quantitative magnetizations by the magnetization component 20. Under the action of the magnetization field with different magnetic field strengths, the magnetic medium 40 has different magnetization states. The detection component 30 is used to detect the magnetic medium 40 after each magnetization. The change of the detection signal obtained can reflect the magnetization state of the magnetic medium 40, and then obtain the required parameters about the magnetization field, thereby reflecting the performance of the magnetic medium 40. By using the magnetic medium performance detection device of the present application, the magnetic medium 40 can be directly placed on the rotating component 10 without destroying the integrity of the magnetic medium 40, thereby realizing non-destructive detection of the magnetic medium performance. In addition, the detection component 30 has no built-in magnetic field, and will not perform additional magnetization on the magnetic medium 40 to affect the detection result. And because the magnetizing component 20 and the detection component 30 are on the same circle and coaxial with the rotating component 10, it can be achieved that when the rotating component 10 rotates one circle, it will definitely undergo one magnetization by the magnetizing component 20 and one detection by the detection component 30, thereby ensuring the timeliness of the detection of the magnetic medium 40.

[0039] It should be noted that the detection component 30 and the magnetization component 20 do not affect each other and work independently, so the detection component 30 will not affect the magnetization effect of the magnetization component 20, and the magnetization component 20 will not affect the detection result of the detection component 30.

[0040] It should be noted that the magnetization range of the magnetization assembly 20 is radial, and the starting center of the radiation is at the shortest distance between the magnetization assembly 20 and the rotating assembly 10. When one end of the magnetic medium 40 rotates to one side of the magnetization range, the magnetic medium 40 begins to be magnetized until the other end of the magnetic medium 40 leaves the other side of the magnetization range. The magnetization assembly 20 includes an existing magnetization device to determine the size of the magnetization range.

[0041] It should be noted that the detection range of the detection component 30 is radial, and the starting center of the radiation is at the point where the distance between the detection component 30 and the rotating component 10 is the shortest. When one end of the magnetic medium 40 rotates to one side of the detection range, the detection component 30 detects a signal, and when it reaches the position corresponding to the radiation center, the detection signal reaches a peak value. When the entire magnetic medium 40 is within the detection range, the detection signal is zero. When one end of the magnetic medium 40 leaves the detection range and the other end rotates to the position corresponding to the radiation center, the detection signal drops to a minimum value. Until the other end of the magnetic medium 40 leaves the detection range, the detection signal returns to zero. At this point, a detection is completed. In other words, since the magnetic medium 40 has a certain length, the detection signal is not in the form of a pulse signal, but is broadened into a sinusoidal signal. The detection component 30 includes an existing detection device to determine the size of the detection range.

[0042] Specifically, in different rotation cycles of the rotating assembly 10, the magnetic field strength of the magnetizing field is different, so that the magnetic medium 40 has different magnetization states under the influence of the coercive force magnetic property. That is to say, every time the rotating assembly 10 rotates one circle, the magnetic field strength of the magnetizing field will change, so that the magnetic medium 40 will be magnetized by the magnetizing field with different magnetic field strengths every time it rotates one circle through the magnetization range. Due to the influence of the coercive force magnetic property of the magnetic medium 40, the magnetization state of the magnetic medium 40 is different under the action of the magnetizing field with different magnetic field strengths. For example, the magnetizing assembly 20 generates a plurality of interval magnetizing fields H 1 , H 2 , H 3 ..., the magnetizing field is used for magnetizing the magnetic medium 40 respectively, and the signal of the magnetic medium after each magnetizing field magnetization detected by the detection component 30 corresponds to M 1 、M 2 、M 3 ....

[0043] Specifically, the rotating assembly 10 includes a rotating cylinder 11, a magnetic medium 40 is arranged on the surface of the rotating cylinder 11, and the magnetization assembly 20 is arranged at a distance from the rotating cylinder 11. The magnetic medium 40 is directly arranged on the surface of the rotating cylinder 11, and the operation is convenient while ensuring non-destructive detection of the magnetic medium 40. The magnetic medium 40 can change position with the rotation of the rotating cylinder 11, ensuring that one detection can be achieved after one magnetization.

[0044] Optionally, the magnetic medium 40 is attached to the surface of the rotating drum 11, which can ensure that the magnetic medium 40 is stably arranged on the rotating drum 11 and prevent the magnetic medium 40 from falling off during the rotation process. For example, the magnetic medium 40 can be attached to the rotating drum 11 using tape.

[0045] Of course, it is also possible to configure the surface of the rotating cylinder 11 to have an adsorption area, the adsorption area has multiple adsorption holes, and the air inside the rotating cylinder 11 is extracted to adsorb the magnetic medium 40 on the adsorption area. In this configuration, after the air inside the rotating cylinder 11 is extracted by a vacuum pump, the entire magnetic medium 40 can be adsorbed on the surface of the rotating cylinder 11 through the pressure difference between the inside and outside of the rotating cylinder 11. This configuration does not require the use of adhesive materials, so as to avoid affecting the cleanliness of the surface of the magnetic medium 40.

[0046] Specifically, the rotating drum 11 rotates at a uniform speed, so that the time interval between each magnetization and detection of the magnetic medium 40 is the same, which is convenient for coordinating the change cycle of the magnetization field generated by the magnetization component 20 and facilitating the analysis of the detection signal. Preferably, the rotation speed is 75r / min, which can ensure that the detection component 30 collects a stable detection signal.

[0047] Optionally, the detection component 30 includes a coil-type inductive head magnetic sensor capable of sensing a detection signal of the magnetic medium 40 .

[0048] Of course, the detection component 30 may also include a TMR magnetoresistive element, which has no built-in magnetic steel, thereby ensuring the accuracy of the detection result and preventing the magnetic medium 40 from being subjected to additional magnetization.

[0049] Specifically, the magnetization assembly 20 includes an electromagnet, which is used to generate a magnetization field of a certain size, and the device is simple while ensuring the magnetization effect, and the manufacturing cost is lower.

[0050] Specifically, the magnetizing field is less than or equal to 10000 Oe, which can meet the saturation magnetization of current high coercive force magnetic medium samples.

[0051] like Figure 2 As shown, the present invention also provides a method for detecting the performance of a magnetic medium, using the above-mentioned device for detecting the performance of a magnetic medium, including: performing magnetization processing on a magnetic medium 40, and generating a detection signal through the detection component 30 of the device for detecting the performance of a magnetic medium; judging the magnetization state of the magnetic medium 40 by monitoring the change rule of the detection signal; and determining the coercive force magnetic characteristics of the magnetic medium 40 according to the magnetization state and the detection signal. By quantitatively magnetizing and detecting the magnetic medium 40, a detection signal is obtained under different quantitative magnetization states of the magnetic medium 40, and the magnetization state of the magnetic medium 40 is judged according to the change rule of the detection signal, so as to obtain the coercive force magnetic characteristics of the magnetic medium 40 using the magnetization state and the detection signal.

[0052] Specifically, during the process of magnetizing the magnetic medium 40 and generating a detection signal through the detection component 30 of the magnetic medium performance detection device, if the amplitude of the detection signal increases, it is determined that the magnetic medium 40 is in a forward magnetization state; if the amplitude of the detection signal remains unchanged, it is determined that the magnetic medium 40 is in a saturated magnetization state; if the amplitude of the detection signal decreases, it is determined that the magnetic medium 40 is in a reverse magnetization state. The magnetization state of the magnetic medium 40 at a certain stage can be determined by using the change in the amplitude of the detection signal.

[0053] It should be noted that when the magnetic medium 40 is in a forward magnetization state or a reverse magnetization state, the amplitude of the detection signal will not remain unchanged. Therefore, if the amplitude of the detection signal remains unchanged, it can be determined that the magnetic medium 40 is in a saturated magnetization state.

[0054] It should be noted that, in actual operation, when the magnetic medium 40 is in a saturated magnetization state, the amplitude of the detection signal may fluctuate very slightly within the allowable error range, but it still belongs to the situation where the amplitude of the detection signal remains unchanged as described above, that is, within the allowable error range, a very small fluctuation in the amplitude of the detection signal does not affect the judgment that the magnetic medium 40 is in a saturated magnetization state.

[0055] It should be noted that the three magnetization states of the forward magnetization state, the saturation magnetization state or the reverse magnetization state describe the magnetization state of the magnetic medium 40 in a certain stage, and the magnetic medium 40 actually has a plurality of different quantitative magnetization states in this stage. For example, the magnetic medium 40 has a plurality of different quantitative magnetization states after being quantitatively magnetized by magnetization fields of different magnetic field strengths for a plurality of times, and the amplitude of the obtained detection signal changes gradually, then it is judged that the magnetic medium 40 is in the forward magnetization state at this stage, and in this forward magnetization state, the magnetic medium 40 has a plurality of different quantitative magnetization states, corresponding to which there will be a plurality of different quantitative magnetization fields, so as to reflect the coercive magnetic characteristics of the magnetic medium 40.

[0056] Specifically, in the process of determining the coercive force magnetic characteristics of the magnetic medium according to the magnetization state and the detection signal, if the magnetic medium 40 changes from the forward magnetization state to the saturation magnetization state, the critical magnetization field of the magnetized magnetic medium 40 is judged to be the saturation coercive force magnetization field; if the magnetic medium 40 is in the reverse magnetization state and the amplitude of the detection signal is zero, the critical magnetization field of the magnetized magnetic medium 40 is judged to be the residual coercive force magnetization field. If the magnetic medium 40 changes from the forward magnetization state to the saturation magnetization state, that is, the detection signal changes from increasing amplitude to constant amplitude, it means that the magnetic medium 40 is forward magnetized and changes in the saturation magnetization direction under the quantitative magnetization of the magnetization field of the changing magnetic field strength. The magnetization field that causes the magnetic medium 40 to change from the forward magnetization state to the saturation magnetization state is the saturation coercive force magnetization field, which represents one of the coercive force magnetic characteristics of the magnetic medium 40.

[0057] Similarly, if the magnetic medium 40 is in a reverse magnetization state and the amplitude of the detection signal is zero, that is, when the amplitude of the detection signal decreases to zero, the magnetization field of the magnetized magnetic medium 40 at this time serves as the residual coercive force magnetization field, representing another type of coercive force magnetic property of the magnetic medium 40.

[0058] Specifically, in the process of magnetizing the magnetic medium 40 and generating a detection signal through the detection component 30 of the detection device for detecting the performance of the magnetic medium, the magnetization component 20 of the detection device is controlled to generate a magnetization field with a magnetic field strength that changes monotonically at intervals. Since the interval change of the magnetization field is controlled, the magnetic medium 40 can be quantitatively magnetized multiple times, and the monotonically changing magnetization field can ensure accurate judgment of the magnetization state of the magnetic medium, thereby obtaining accurate data of the saturation coercive force magnetization field and the residual coercive force magnetization field.

[0059] In the process of obtaining the data of the saturated coercive force magnetization field, the magnetic field strength of the magnetization field increases in the positive interval during the magnetization process of the magnetic medium 40 and the generation of the detection signal by the detection component 30 of the detection device of the magnetic medium performance. By controlling the increase in the positive interval of the magnetic field strength of the magnetization field, the magnetic medium 40 can obtain the amplitude of the detection signal increasing under the influence of the coercive force magnetic property, so that the magnetic medium 40 is in the forward magnetization state. Moreover, in the process of the continuous increase of the magnetic field strength, the saturated magnetization state can be reached, so that the data of the saturated coercive force magnetization field can be obtained.

[0060] Specifically, the method for detecting the performance of magnetic medium also includes a first preprocessing step before magnetizing the magnetic medium 40 and generating a detection signal through the detection component 30 of the detection device for detecting the performance of magnetic medium. The first preprocessing step includes: demagnetizing the magnetic medium 40; and after the first preprocessing step is completed, in the process of magnetizing the magnetic medium 40 and generating a detection signal through the detection component 30 of the detection device for detecting the performance of magnetic medium, the magnetic field intensity of the magnetization field is increased by controlling the state of the magnetization component 20. In other words, in order to obtain the data of the saturated coercive force magnetization field, it is necessary to first perform the first preprocessing step on the magnetic medium 40 to demagnetize the magnetic medium 40 to avoid the magnetic field of the magnetic medium 40 itself from affecting the detection signal.

[0061] It should be noted that after the magnetic medium 40 is demagnetized and then detected by the detection component 30 , the amplitude of the detection signal obtained is zero, which proves that the magnetic medium 40 is completely demagnetized.

[0062] In the process of obtaining the data of the residual coercive force magnetization field, the reverse interval of the magnetic field intensity of the magnetization field increases during the magnetization process of the magnetic medium 40 and the generation of the detection signal by the detection component 30 of the detection device of the magnetic medium performance. By controlling the increase of the reverse interval of the magnetic field intensity of the magnetization field, the amplitude of the detection signal obtained by the magnetic medium 40 under the influence of the coercive force magnetic property can be gradually reduced, so that the magnetic medium 40 is in a reverse magnetization state.

[0063] Specifically, the method for detecting the performance of magnetic medium also includes a second preprocessing step before magnetizing the magnetic medium 40 and generating a detection signal through the detection component 30 of the detection device for detecting the performance of magnetic medium. The second preprocessing step includes: saturating the magnetic medium 40; and after the second preprocessing step is completed, in the process of magnetizing the magnetic medium 40 and generating a detection signal through the detection component 30 of the detection device for detecting the performance of magnetic medium, the magnetic field intensity of the magnetization field is controlled by controlling the state of the magnetization component 20 so that the reverse interval increases. In other words, in order to obtain the data of the residual coercive force magnetization field, it is necessary to first perform the second preprocessing step on the magnetic medium 40 so that the magnetic medium 40 is in a saturated magnetization state. At this time, the amplitude of the detection signal obtained by detecting the magnetic medium 40 is of a certain size. Under multiple quantitative magnetizations of the magnetization field with increasing reverse intervals, the amplitude of the detection signal is in a decreasing state until the detection signal with an amplitude of zero appears for the first time, indicating that the critical magnetization field at this time is the residual coercive force magnetization field.

[0064] It should be noted that the saturation magnetization of the magnetic medium 40 in the second preprocessing step can be a separate saturation magnetization treatment of the magnetic medium 40, or it can be that after the magnetic medium 40 is magnetized to the saturation magnetization state in one of the above optional embodiments, the magnetic field strength of the magnetization field is controlled to satisfy the increase in the reverse interval to obtain the residual coercive force magnetization field data.

[0065] In an optional embodiment, the method for detecting the performance of a magnetic medium at least includes: step S11: controlling the magnetization field to be located at the initial magnetic field intensity and recording; step S12: controlling the rotating cylinder 11 of the rotating assembly 10 of the detection device for the performance of the magnetic medium to rotate one circle, so that the magnetic medium 40 successively passes through the magnetization range and the detection range, and recording the detection signal; step S13: controlling the magnetic field intensity of the magnetization field to change once, and recording; step S14: repeating step S12 and step S13 until the amplitude of the detection signal remains unchanged or the amplitude of the detection signal decreases to zero. In the above steps, by controlling the rotating cylinder 11 to rotate, in each rotation cycle, the magnetic medium 40 successively passes through the magnetization range and the detection range, that is, after a quantitative magnetization, the detection assembly 30 detects the magnetic medium 40. After multiple cycles of rotation, the magnetic medium 40 is quantitatively magnetized multiple times and is in different magnetization states.

[0066] Since the magnetic medium performance detection device provided by the present invention can generate a magnetizing field for quantitative magnetization of the magnetic medium 40, the magnetic medium 40 will be magnetized to different states according to the different coercive force magnetic properties. The detection component 30 of the magnetic medium performance detection device can quantitatively detect the signal size of the magnetic medium, thereby realizing the quantitative detection of the coercive force magnetic properties of the magnetic medium. The magnetic medium performance detection method provided by the present invention does not need to destroy the magnetic medium 40 for sampling during the detection process, and is suitable for non-destructive detection of the performance of large-area magnetic media 40, which is much superior to the current destructive sampling magnetic medium performance detection method.

[0067] Embodiment 1

[0068] like Figure 3 As shown, in order to obtain the data of the saturation coercive force magnetization field, after the magnetic medium 40 is demagnetized, the magnetization assembly 20 sequentially generates a magnetization field H with increasing positive intervals. 11 , H 12 , H 13 ..., the signals collected by the detection component 30 are M 11 、M 12 、M 13 ..., the collected signal characteristics are that the amplitude increases successively. When H is generated 1n When the magnetization field is on, the detection signal M detected by the detection component 30 is 1n With the last magnetization field H 1n-1 The magnetic medium signal M detected after magnetization 1n-1 The same, then the magnetizing field H 1n-1 The magnitude is the saturation coercive force magnetization field of the magnetic medium 40.

[0069] Embodiment 2

[0070] like Figure 4 As shown, in order to obtain the data of the residual magnetic coercive force magnetization field, after the magnetic medium 40 is saturated, the magnetization assembly 20 sequentially generates a magnetization field H with increasing reverse intervals. 21 , H 22 , H 23 ..., the signals collected by the detection component 30 are M 21 、M 22 、M 23 ..., the collected signal characteristic is that the amplitude decreases successively. When H is generated 2n When the detection signal detected by the detection component 30 is zero for the first time, that is, the amplitude of the detection signal is zero, the magnetization field H 2n The magnitude is the residual coercive force magnetizing field of the magnetic medium 40.

[0071] Optionally, after the saturation coercive force magnetization field of the magnetic medium 40 is obtained by the means of the first embodiment, the magnetic medium 40 is saturated magnetized under the saturation coercive force magnetization field.

[0072] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0073] 1. By placing the magnetic medium 40 on the rotating assembly 10 and rotating with the rotating assembly 10 , the magnetic medium 40 can pass through the magnetization range multiple times and be subjected to multiple quantitative magnetization by the magnetization assembly 20 .

[0074] 2. By using the magnetic medium performance detection device of the present application, the magnetic medium 40 can be directly placed on the rotating assembly 10 without destroying the integrity of the magnetic medium 40, thereby realizing non-destructive detection of the magnetic medium performance.

[0075] 3. When the rotating component 10 rotates one circle, it must undergo one magnetization by the magnetizing component 20 and one detection by the detection component 30, thereby ensuring the timeliness of the detection of the magnetic medium 40.

[0076] 4. By controlling the positive interval increase of the magnetic field strength of the magnetizing field, the magnetic medium 40 can obtain the amplitude increase of the detection signal under the influence of the coercive force magnetic characteristics, so that the magnetic medium 40 is in a positive magnetization state. In addition, in the process of increasing the magnetic field strength, the saturation magnetization state can be reached, so that the data of the saturation coercive force magnetization field can be obtained.

[0077] 5. By controlling the increase of the reverse interval of the magnetic field strength of the magnetizing field, the magnetic medium 40 can obtain a detection signal with a decreasing amplitude under the influence of the coercive force magnetic characteristics until the first detection signal with an amplitude of zero appears, and the critical magnetizing field at this time is obtained as the residual coercive force magnetizing field.

[0078] Obviously, the embodiments described above are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0079] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0080] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0081] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A device for detecting magnetic medium performance, characterized in that: include: A rotating assembly (10), wherein the rotating assembly (10) is used to drive the magnetic medium (40) to rotate; a magnetizing component (20), the magnetizing component (20) being located outside the rotation circle of the rotating component (10), the magnetizing component (20) being used to generate a plurality of magnetizing fields with different magnetic field strengths, so that when the magnetic medium (40) rotates to the magnetizing range of the magnetizing component (20), the magnetizing component (20) performs quantitative magnetization on the magnetic medium (40); A detection component (30), wherein the detection component (30) has no built-in magnetic field, the detection component (30) is located outside the rotation circle of the rotating component (10) and is spaced apart from the magnetizing component (20), and when the magnetic medium (40) rotates to a detection range of the detection component (30), the detection component (30) quantitatively detects the performance of the magnetic medium (40) and generates a detection signal; Wherein, in each rotation cycle of the rotating component (10), the magnetic medium (40) is successively magnetized by the magnetizing component (20) and detected by the detecting component (30) to complete a quantitative magnetization of the magnetizing component (20) and a quantitative detection of the detecting component (30).

2. The device for detecting magnetic medium performance according to claim 1, characterized in that: In different set rotation cycles of the rotating component (10), the magnetic field strength of the magnetizing field is different, so that the magnetic medium (40) has different magnetization states under the influence of coercive force magnetic properties.

3. The device for detecting magnetic medium performance according to claim 1, characterized in that: The rotating assembly (10) comprises a rotating cylinder (11), and the magnetic medium (40) is arranged on the surface of the rotating cylinder (11).

4. The device for detecting magnetic medium performance according to claim 3, characterized in that: The magnetic medium (40) is adhered to the surface of the rotating cylinder (11).

5. The device for detecting magnetic medium performance according to claim 3, characterized in that: The surface of the rotating cylinder (11) has an adsorption area, and the adsorption area has a plurality of adsorption holes. Air inside the rotating cylinder (11) is extracted so that the magnetic medium (40) is adsorbed on the adsorption area.

6. The device for detecting magnetic medium performance according to claim 3, characterized in that: The rotating cylinder (11) rotates at a constant speed.

7. The device for detecting magnetic medium properties according to any one of claims 1 to 6, characterized in that: The detection component (30) comprises a coil-type inductive head magnetic sensor; or The detection component (30) comprises a TMR magnetoresistive element, and the TMR magnetoresistive element has no built-in magnetic steel.

8. The device for detecting magnetic medium properties according to any one of claims 1 to 6, characterized in that: The magnetizing assembly (20) comprises an electromagnet.

9. The device for detecting magnetic medium properties according to any one of claims 1 to 6, characterized in that: The magnetizing field is less than or equal to 10000 Oe.

10. A method for detecting magnetic medium performance, characterized in that: The device for detecting the performance of a magnetic medium according to any one of claims 1 to 9 comprises: Performing magnetization processing on the magnetic medium (40), and generating a detection signal through a detection component (30) of a device for detecting the performance of the magnetic medium; By monitoring the change pattern of the detection signal, the magnetization state of the magnetic medium (40) is determined; The coercive force magnetic property of the magnetic medium (40) is determined based on the magnetization state and the detection signal.

11. The method for detecting magnetic medium performance according to claim 10, characterized in that: In the process of magnetizing the magnetic medium (40) and generating a detection signal through the detection component (30) of the magnetic medium performance detection device, If the amplitude of the detection signal increases gradually, it is determined that the magnetic medium (40) is in a forward magnetization state; If the amplitude of the detection signal remains unchanged, it is determined that the magnetic medium (40) is in a saturated magnetization state; If the amplitude of the detection signal changes in a decreasing manner, it is determined that the magnetic medium (40) is in a reverse magnetization state.

12. The method for detecting magnetic medium performance according to claim 11, characterized in that: In the process of determining the coercive force magnetic property of the magnetic medium (40) according to the magnetization state and the detection signal, If the magnetic medium (40) changes from a forward magnetization state to a saturation magnetization state, it is determined that the critical magnetization field for magnetizing the magnetic medium (40) is a saturation coercive force magnetization field; If the magnetic medium (40) changes from a saturated magnetization state to a reverse magnetization state, and the amplitude of the detection signal is zero when the magnetic medium (40) is in the reverse magnetization state, it is determined that the critical magnetization field for magnetizing the magnetic medium (40) is a residual coercive force magnetization field.

13. The method for detecting magnetic medium performance according to claim 10, characterized in that: In the process of magnetizing the magnetic medium (40) and generating a detection signal through the detection component (30) of the detection device for detecting the properties of the magnetic medium, the magnetization component (20) of the detection device is controlled to generate a magnetization field with a magnetic field intensity that changes monotonically at intervals.

14. The method for detecting magnetic medium performance according to claim 13, characterized in that: In the process of magnetizing the magnetic medium (40) and generating a detection signal through the detection component (30) of the magnetic medium performance detection device, the magnetic field intensity of the magnetization field increases in a positive direction.

15. The method for detecting magnetic medium performance according to claim 13, characterized in that: The method for detecting the properties of a magnetic medium further comprises a first preprocessing step before the process of magnetizing the magnetic medium (40) and generating a detection signal through the detection component (30) of the device for detecting the properties of the magnetic medium, wherein the first preprocessing step comprises: Demagnetizing the magnetic medium (40); After the first pre-processing step is completed, during the process of performing the magnetization process on the magnetic medium (40) and generating a detection signal through the detection component (30) of the magnetic medium performance detection device, the state of the magnetization component (20) is controlled so that the magnetic field intensity of the magnetization field satisfies the positive interval increase.

16. The method for detecting magnetic medium performance according to claim 13, characterized in that: In the process of magnetizing the magnetic medium (40) and generating a detection signal through the detection component (30) of the magnetic medium performance detection device, the magnetic field intensity of the magnetization field increases at a reverse interval.

17. The method for detecting magnetic medium performance according to claim 13, characterized in that: The method for detecting the properties of a magnetic medium further comprises a second preprocessing step before the process of magnetizing the magnetic medium (40) and generating a detection signal through the detection component (30) of the device for detecting the properties of the magnetic medium, wherein the second preprocessing step comprises: The magnetic medium (40) is subjected to saturation magnetization treatment; After the second pre-processing step is completed, during the process of performing the magnetization process on the magnetic medium (40) and generating a detection signal through the detection component (30) of the magnetic medium performance detection device, the state of the magnetization component (20) is controlled so that the magnetic field intensity of the magnetization field satisfies the increase of the reverse interval.

18. The method for detecting magnetic medium performance according to claim 10, characterized in that: The method for detecting the magnetic medium performance at least comprises: Step S11: controlling the magnetization field to be at an initial magnetic field strength and recording; Step S12: controlling the rotating cylinder (11) of the rotating assembly (10) of the magnetic medium performance detection device to rotate one circle, so that the magnetic medium (40) passes through the magnetization range and the detection range successively, and recording the detection signal; Step S13: controlling the magnetic field intensity of the magnetizing field to change once, and recording the change; Step S14: Repeat step S12 and step S13 until the amplitude of the detection signal remains unchanged or the amplitude of the detection signal decreases to zero.

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