JPH06103745A - Magnetic recorder - Google Patents

Abstract

PURPOSE:To provide the magnetic recorder having excellent durability and weatherability by collecting the dust and foreign matter in the device by static electricity. CONSTITUTION:A metallic disk 9 with an org. high-molecular coating film is mounted onto the same revolving shaft 6 as the revolving shaft of a magnetic disk 1 so as to face this magnetic disk 1. A magnetic head 7 supported by a head supporting spring 8 is pressed onto the surface of the one magnetic disk 1 and a sliding spring 10 made of an org. high-molecular material onto the other metallic disk 9 with the org. high-molecular coating film, respectively under prescribed pressing forces. As a result, the static electricity is generated on the surface of the metallic disk 9 with the org. high-molecular coating film by the friction of the magnetic disk 8 with the org. high-molecular coating film rotating together with the magnetic disk 1 and the sliding spring 10 made of the org. high-molecular material, thereby, the dust in the device is collected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording device,
More specifically, the present invention relates to the structure of a magnetic recording device of a type including a recording / reproducing magnetic head (hereinafter referred to as a magnetic head) and a rotating magnetic recording disk, and the magnetic head temporarily contacts the surface of the magnetic disk.

[0002]

2. Description of the Related Art For example, a magnetic recording device used as a mass storage device for high speed writing and reading of an electronic computer is
A magnetic head and a rotating magnetic recording disk (hereinafter referred to as a magnetic disk) are generally used, and the magnetic head is generally in contact with the surface of the magnetic disk temporarily or constantly. In this magnetic disk, a ferromagnetic thin film having a high recording density is formed on the surface of a non-magnetic substrate by a sputtering method or the like, and a protective film made of amorphous carbon or an inorganic compound is formed on the surface of the non-magnetic substrate. It is common practice to apply a liquid lubricant on the protective film in order to improve the corrosion resistance.

In this case, when the amount of the lubricant decreases due to the liquid lubricant being scattered by the sliding of the magnetic head and the rotating magnetic disk or being decomposed and evaporated, the sliding characteristics are deteriorated.
Further, the holding mechanism of the magnetic head may be destroyed due to an increase in the dynamic friction coefficient between the magnetic head and the magnetic disk. In addition, the rotational speed of the magnetic disk of the magnetic recording device is becoming higher and higher as the reading speed becomes higher. Therefore, sliding conditions between the magnetic head and the magnetic disk are becoming more and more severe. To alleviate such high-speed sliding, a technique has been proposed in which the lubricant layer has a two-layer structure, as disclosed in, for example, Japanese Patent Laid-Open No. 63-237216.

[0004]

In the above-described magnetic disk having the two-layer structure of the lubricant layer of the prior art, the lubricating film having excellent scattering resistance can reduce the friction coefficient even in a high magnetic disk rotation speed region. Has been achieved. However, recently, even with a magnetic disk having such a sufficient scattering-resistant lubricating film, the static electricity generated by the friction between the magnetic head and the magnetic disk or the friction between the magnetic disk surface and the air causes fine dust in the air (solid It has been found that foreign matter) may be attracted to the surface of the magnetic disk and enter into the sliding track between the magnetic head and the magnetic disk to induce a partial increase in the coefficient of friction. In a magnetic recording apparatus of a type in which a magnetic head and a magnetic disk are temporarily in contact with each other, these effects are obtained by a continuous CSS (contact start / stop) test (hereinafter abbreviated as CSS test) on the same sliding track. The damage appears as a decrease in the number of repetitions or an increase in the friction coefficient at the same number of CSSs. Dust that is attracted by static electricity is not only foreign matter that has entered from the outside of the magnetic recording device housing that is hermetically sealed and has fine meshes, but also the temperature inside the device during sliding of the magnetic head and magnetic disk and during operation. It also includes solids having a size of 1 μm or less, which are generated by a chemical reaction caused by the rise.

The present invention has been made in view of the above points, and its main object is to eliminate static electricity on the surface of a magnetic disk generated by contact between a magnetic head and a rotating magnetic disk, and to remove dust due to static electricity. To prevent dust collection
The first object is to provide a magnetic recording device having excellent reliability and durability for a long period of time.

Further, it is another object of the present invention to provide a magnetic recording device which achieves the following effects in addition to achieving the above main purpose. One of them is that a magnetic recording device is configured with a magnetic head and a magnetic disk that are less likely to be contact-charged or friction-charged beforehand, and static electricity is not generated on the surface of the magnetic disk due to the contact between the magnetic head and the magnetic disk. A second problem is to provide a magnetic recording device in which durability is less deteriorated by dust even when sliding. The other is to actively generate strong static electricity in the magnetic head inside the magnetic recording device and parts other than the magnetic disk,
Providing a highly reliable magnetic recording device that has a dust collection function inside by creating charged parts and does not affect the magnetic recording mechanism itself even if dust enters inside or foreign matter occurs inside This is the third issue.

[0007]

A first object of the present invention is to provide a magnetic recording apparatus of a type having a magnetic head and a rotating magnetic recording disk, in which the magnetic head and the magnetic recording disk temporarily or steadily contact each other. A part of it is in contact with the end face of the magnetic recording disk only when the magnetic recording disk is stopped, and the other part is connected to the magnetic recording device housing.
This is achieved by a magnetic recording device formed by forming a conductive body having an Ωcm or less.

Further, as an application thereof, in a magnetic recording apparatus of a type having a magnetic head and a rotating magnetic recording disk, and the magnetic head and the magnetic recording disk are in contact with each other temporarily or steadily, the magnetic property of the slider of the magnetic head is increased. One of the conductive wires having a resistivity of 100 Ωcm or less and a thickness of 0.1 mm or less was connected to a portion not in contact with the disk, and the other was connected to a support of a recording head electrically connected to a magnetic recording device housing having a resistivity of 100 Ωcm or less. We propose a magnetic recording device with a structure.

Another application is a magnetic recording apparatus of a type having a magnetic head and a rotating magnetic recording disk, in which the magnetic head and the magnetic recording disk temporarily or steadily contact each other. The outermost surface of the rotating shaft of the peripheral portion or a portion that comes into contact with a jig for fixing to the rotating shaft has a resistivity of 100 Ωcm or less and a thickness of 100.
The rotating shaft, a jig for fixing the magnetic disk to the rotating shaft, a bearing for supporting the rotating shaft to the magnetic recording device housing, and the magnetic recording device housing are all covered with a conductive material of μm or less. A magnetic recording device formed of a conductive material having a rate of 100 Ωcm or less is proposed.

Further, as another application, in a magnetic recording apparatus of a type having a magnetic head and a rotating magnetic recording disk, and the magnetic head and the magnetic recording disk temporarily or steadily contact each other, the magnetic recording apparatus We propose a magnetic recording device with a built-in static eliminator that generates positive ions or negative ions at a position inside the enclosure that does not contact the rotating magnetic recording disk.

The second problem is of a type having a magnetic head and a rotating magnetic recording disk, and the magnetic head and the magnetic recording disk are temporarily in contact with each other when the magnetic recording disk starts to rise and falls. In a magnetic recording device, a recording area on a magnetic recording disk and an area on which a recording head slides are divided, and a carbon-based protective film containing 5% or more by mass of a graphite component is formed in the sliding area. Achieved by a recording device.

Further, the third problem is a magnetic recording disk of a type having a magnetic head and a rotating magnetic recording disk, in which the magnetic head and the magnetic recording disk are in contact temporarily or constantly. It has a mechanism in which a polymer material plate, one of which is fixed to a magnetic recording device housing, is pressed by a weak force of 0.03 N or less on a polymer material disk that is attached to the rotating shaft of and rotates with a magnetic recording disk. This is achieved by a magnetic recording device comprising:

Here, for example, an aluminum substrate or a graphite substrate is used as the substrate of the magnetic disk. A glass substrate may be used when conductivity is not required. The surface of the aluminum substrate may be plated with nickel, phosphorus or the like. Further, a surface processing treatment which is usually called texture processing may be performed. That is,
By pressing diamond abrasive grains or polishing tape while rotating the substrate, fine concentric grooves are formed on the substrate to prevent head sticking and control magnetic anisotropy. . Further, in the glass substrate, the surface may be etched with a chemical such as strong acid to make fine irregularities to reduce the tangential force during sliding.

Before the recording film is formed on the substrate of the magnetic disk, chromium or the like may be formed as a base film by a sputtering method or the like in order to improve the magnetic characteristics of the recording film. For the magnetic recording film on the magnetic disk substrate, cobalt nickel, cobalt chromium, cobalt chromium, and a small amount of platinum, tantalum, vanadium, or samarium are used.

A protective film is formed on the magnetic recording film on the magnetic disk substrate. As the protective film, for example, an amorphous carbon protective film is generally used. This amorphous carbon protective film is formed by sputtering in an inert gas targeting graphite or in a mixed gas of an inert gas and a hydrocarbon gas such as methane, a hydrocarbon gas, an alcohol. , An organic compound such as acetone, alone or mixed with hydrogen gas, an inert gas, etc., to form by plasma CVD, or a method of ionizing the organic compound and accelerating it by applying a voltage to collide with a substrate, etc. There is.

Further, instead of the amorphous carbon protective film, it is possible to use, for example, a cubic boron nitride film formed by a plasma CVD method using boron hydride, ammonia and hydrogen as raw materials. Furthermore, it is also possible to use a yttria-stabilized zirconium oxide protective film, silicon oxide, or the like as the protective film.

A perfluoropolyether polymer lubricant composed of carbon, fluorine and oxygen is generally applied on the protective film on the magnetic disk substrate. The average molecular weight of the perfluoropolyether lubricant is 15
It is preferably about 00 to 10000. As the terminal group, a group having a neutral group such as a fluoroalkyl group or a polar group such as a hydroxyl group, a carboxylic acid group or an ether group attached to one end or both ends is preferable.

As a flying slider to which a magnetic head is attached, a non-magnetic rigid body such as alumina / titanium carbide, which is lightweight and has high strength, is often used.

The disk made of a polymer material which is attached to the rotating shaft of the magnetic recording disk and rotates together with the magnetic recording disk or the plate made of a polymer material fixed in the magnetic recording device is nylon, cellulose, cellulose acetate or poly. Any one or a combination of two or more of methyl methacrylate, polyacetal, polyethylene terephthalate, polystyrene, polyethylene, polypropylene, polytetrafluoroethylene, etc. may be used.

[0020]

[Action]

(1) Operation of means for solving the first problem:
Static electricity due to friction is generated on the sliding surface between the magnetic head and the rotating magnetic disk, and the surface of the magnetic disk is charged. However, when the magnetic disk is stopped, the end surface of the disk is contacted with a conductive body made of a conductive material and connected to the housing of the magnetic recording device, so that the electric charge charged on the magnetic disk is removed through this conductive body. . As a result, a magnetic recording device having a long life and excellent reliability is provided.

If one of the conductive wires is connected to the slider of the magnetic head and the other is connected to the housing of the magnetic recording device, even if the surface of the magnetic disk slides on the slider of the magnetic head at high speed, static electricity will be transferred to the slider. It becomes difficult to be charged. This reduces dust adhesion to the slider.

The outermost surface of the innermost peripheral portion of the magnetic recording disk, which is in contact with the rotating shaft or a jig for fixing the rotating shaft, has a resistivity of 100 Ωcm or less and a thickness of 100 μm.
The rotating shaft, the jig for fixing the magnetic disk to the rotating shaft, the bearing for supporting the rotating shaft to the magnetic recording device casing, and the magnetic recording device casing are all covered with the following conductive materials. When the conductive material is 100 Ωcm or less, the effect of removing static electricity is further enhanced.

Further, if a static eliminator for generating positive ions or negative ions is built in at a position inside the housing of the magnetic recording device that does not come into contact with the rotating magnetic recording disk, a magnetic disk in which both positive and negative charges are mixed and charged. It is possible to positively eliminate static electricity on the surface.

(2) Regarding the operation of the means for solving the second problem: The magnetic head and the surface of the rotating magnetic disk come into contact with each other at the time of rising or falling of the rotation, but the portion of the magnetic disk on which the magnetic head slides. Unlike the part used for recording, the part that slides is covered with a protective film containing a large amount of graphite that has excellent conductivity and good sliding characteristics, so static electricity generated by sliding with the magnetic head The electricity is removed from the magnetic disk.

(3) Operation of means for solving the third problem: The polymeric material is charged with static electricity by sliding between the polymeric material that rotates inside the housing of the magnetic recording device and the fixed polymeric material. . As a result, dust that has entered the housing of the magnetic recording device or foreign matter that has been generated inside will not be collected on the polymer material and will not adhere to the recording surface of the magnetic disk or the sliding surface of the magnetic head. Provided is a magnetic recording device which is excellent in environmental resistance.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of this patent will be described below with reference to the drawings. <Embodiment 1> FIG. 1 is a schematic view schematically showing an example of a magnetic recording apparatus of the present invention. The magnetic head of the magnetic recording device, the rotating shaft for rotating the magnetic disk, the rotating mechanism, the casing, and the electric circuit portion are omitted. In the figure, 1 is an aluminum disk substrate (5.25-inch disk) whose surface is preliminarily plated with nickel / phosphorus, on which a thickness of 0.5 μm is formed by sputtering.
A chromium underlayer film, a 0.04 μm thick cobalt-nickel magnetic film, and a 0.04 μm thick amorphous carbon film are sequentially formed. Further, a perfluoropolyether-based polymer lubricant (molecular weight: about 3000) is applied thereon with a thickness of 3 nm by a dip coating method using a fluorocarbon solution. Reference numeral 2 is a ground plate made of a stainless steel plate having a thickness of 0.2 mm, which is curved along the outermost periphery of the disc with a radius of 74 mm, and is also curved outside the disc with a radius of 30 mm in the height direction. The height is 2 mm and the arc length is 50 mm. This ground plate 2 has a resistivity of 100 Ωcm
It is electrically connected to the magnetic recording device housing made of the following metals. The ground plate 2 is pressed against the outermost peripheral end surface of the magnetic disk by a force of 0.1 N while the magnetic disk is stationary, but is separated from the magnetic disk by the ground plate moving mechanism 3 at the same time when the magnetic disk starts rotating. The ground plate comes into contact with the magnetic disk again by the ground plate moving mechanism 3 when the rotation of the magnetic disk is stopped. The magnetic head is in contact with the surface of the magnetic disk while the magnetic disk is stopped, and is a type that floats by the flow of air when the magnetic disk rotates. The distance from the surface of the floating magnetic disk is 0.1 μm.

The magnetic recording apparatus of this embodiment thus formed was subjected to a contact start / stop test (the magnetic disk was rotated while the slider moving mechanism was fixed, the magnetic head was levitated, and then the disk was stopped). The life cycle was evaluated by a test in which the cycle of repeating is repeated at regular intervals (referred to as CSS test). In the CSS test, the rotation speed of the magnetic disk when reaching a constant speed is 4000 rpm, and the position of the magnetic head on the disk is a position with a radius of 40 mm. The magnetic recording device housing is
Originally, a filter (diameter 20 mm) for removing dust was attached, but in this test, this filter was removed to see the effect of dust at an accelerated rate. For reference, a magnetic recording device was prepared in which the stainless steel grounding plate was not grounded to the magnetic recording device housing but was electrically insulated (this is referred to as reference device 1). The external environment during the test was a temperature of 24 ° C. and a humidity of 45%, and the freshness of the air was about the same as in a normal room. In the CSS test, after repeating a certain number of CSS cycles, the magnetic disk is rotated at a low speed (1 rpm), and the strain sensor attached to the support mechanism of the magnetic head measures the frictional force in the tangential direction of the disk. It was As a result, the frictional force of both the apparatus of this embodiment and the reference apparatus 1 was 0.029 N after the CSS number of 1 times, but the frictional force of the reference apparatus 1 increased to 0.078 N after the CSS number of 5000 times. On the other hand, in the apparatus of this example, the value was only slightly increased to 0.031N. After that, the reference device 1 was disassembled, and the sliding track of the magnetic disk was magnified 150 times with a metal microscope and observed, and it was confirmed that the surface of the magnetic disk was damaged at several places. There were some foreign substances that seemed to be a collection of wear debris and dust even in the undamaged areas. When these foreign substances are analyzed by micro Auger spectroscopy, carbon,
Oxygen, fluorine, silicon, sulfur, nitrogen, etc. were detected. Of these, sulfur and nitrogen are each about 2 at%, but elements not contained in these magnetic disks were detected because dust in the air adhered due to sliding of the magnetic head and the magnetic disk. It is considered that the decomposition products of the protective film and the lubricating film generated on the sliding surface are gathered by static electricity. In the apparatus of the present embodiment, no foreign matter or damage was found on these sliding tracks, and the effect of removing electricity from the ground plate 2 was confirmed.

<Embodiment 2> FIG. 2 is a schematic sectional view schematically showing a magnetic recording apparatus according to another embodiment of the present invention. In this figure, the magnetic head, housing, and electric circuit portion of the magnetic recording device are omitted. In the figure, 1
Is a 3.5-inch magnetic disk substrate made of tempered glass, on which a 0.4 μm thick chromium underlayer and a 0.04 μm thick cobalt-chromium-platinum magnetic film are sequentially formed by sputtering. An amorphous carbon film having a thickness of 0.03 μm was formed by a plasma CVD method using methane and hydrogen as raw materials. After that, a gold film 4 having a thickness of 2 μm was vapor-deposited within a distance of 8 mm from the innermost circumference of the magnetic disk toward the outer circumference in the radial direction. A 3 nm-thick perfluoropolyether lubricating film was formed on the magnetic disk by spin coating. After that, the lubricating film on the gold film 4 on the inner circumference was wiped with a fluorocarbon solvent, and then the magnetic disk was fixed to the stainless rotary shaft 6 using the stainless fixing jig 5. As in the case of Example 1, a magnetic head that temporarily contacts the surface of the magnetic disk at the time of rotation rising and falling is attached, and this is housed in a housing except the filter. A reference device 2 is a magnetic recording device which is assembled by not attaching a gold film on the inner circumference of the magnetic disk, and instead increasing the thickness of the fixing jig by 2 μm.

A CSS test was conducted on these devices under the same test conditions as in Example 1. As a result, in the reference device 2, C
The frictional force increased to 0.06 N after 2500 SS cycles, whereas the frictional force of the magnetic recording apparatus of the present embodiment was 0.06 N.
A good result of 034N was obtained.

<Embodiment 3> FIG. 3 is a schematic sectional view schematically showing a magnetic recording apparatus according to still another embodiment of the present invention. In this figure, the magnetic recording device housing,
The electric circuit portion is omitted. In the figure, 1 is a magnetic disk, which was formed in the same manner as in Example 1. The magnetic disk 1 is attached to the rotary shaft 6, and the magnetic head 7 is pressed against the surface of the magnetic disk by a support spring 8 with a force of 0.078N. An aluminum disc (dust collecting plate) 9 whose surface is coated with polypropylene is also attached to the rotary shaft 6. A plate (sliding plate) 10 made of polytetrafluoroethylene has a thickness of 0.025
It is applied with the power of N. These were housed in a casing excluding the filter as in Example 1. For reference, a magnetic recording device excluding the dust collecting plate 9 and the sliding plate 10 was also assembled and used as a reference device 3. The same CS as in the first embodiment
An S test was conducted. In the magnetic recording apparatus of this embodiment, the CSS
Even after 6000 times, a good result with a frictional force of 0.04 N was obtained. In the reference device 3, a head crash occurred after 5,500 CSS cycles.

Since this drawing is an embodiment for explaining the principle, a set of the dust collecting plate 9 and the sliding plate 10 and a set of the magnetic disk 1 and the magnetic head 7 are provided as one set. In accordance with the number of magnetic disks, a plurality of sets are alternately mounted on the same rotary shaft 6 at predetermined intervals. In this case, the preferable distance between the magnetic disk 1 and the dust collecting plate 9 is 2 m.
It is not less than m and not more than 50 mm.

The sliding plate 10, which is pressed against the dust collecting plate 9 with a predetermined pressing force, may be slid on the dust collecting plate 9 at all times. It is also possible to float and rise away from the sliding surface of the dust collecting plate 9 when it rises. However, in order to perform the function as the dust collecting plate 9, the sliding plate 10 should be slid on the dust collecting plate 9 so as to always generate an electric charge exceeding the amount of static electricity generated by the sliding of the magnetic disk and the magnetic head. It is important to.

[0033]

As described above in detail, according to the present invention, the intended purpose can be achieved. That is, the means for solving the first problem has an effect of eliminating static electricity generated by sliding between the magnetic head and the rotating magnetic disk by grounding the magnetic disk or the magnetic head to the magnetic recording device housing. Thus, dust in the air or foreign matter generated during sliding will not adhere to the charged magnetic head or magnetic disk surface. As a result, a stable recording / reading operation is performed for a long period of time, and a magnetic recording device having excellent durability and reliability is provided.

Further, according to the means for solving the second problem, the contact between the recording head and the magnetic disk surface, which causes static electricity, is not made in the recording area of the magnetic disk surface, and the static electricity generated in the sliding area is also generated. It is relaxed by the graphite component in the protective film, and has the effect of reducing the adhesion of dust to the recording area of the magnetic disk due to static electricity.

Further, according to the means for solving the third problem, a polymer sliding component having a strong dust collecting function by charging is put in a portion other than the magnetic disk and the magnetic head inside the magnetic recording apparatus. In addition, foreign matter generated by entering the magnetic recording apparatus or sliding is attracted, and dust and foreign matter are less likely to adhere to the surface of the magnetic head or the magnetic disk. As a result, it is possible to provide a magnetic recording device that is superior in durability and reliability even with a magnetic head and a magnetic disk made of the same material as the conventional one.

[Brief description of drawings]

FIG. 1 is a schematic perspective view schematically showing a main part of a magnetic recording device according to an embodiment of the present invention.

FIG. 2 is a schematic cross-sectional view schematically showing a main part of a magnetic recording device according to another embodiment.

FIG. 3 is a schematic cross-sectional view schematically showing a main part of a magnetic recording device according to another embodiment which is also different.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Magnetic disk, 2 ... Stainless steel ground plate, 3 ... Ground plate moving mechanism, 4 ... Gold vapor deposition film, 5 ... Magnetic disk fixing jig, 6 ... Rotating shaft, 7 ... Magnetic head, 8 ... Head support spring, 9 ... Metal plate coated with polymer on the surface,
10 ... Spring made of polymer material.

Claims (19)

[Claims] 1. In a magnetic recording apparatus of a type having a magnetic head and a rotating magnetic recording disk, the magnetic head and the magnetic recording disk contacting each other temporarily or steadily, a part of a conductor having a resistivity of 1 Ωcm or less is used. A magnetic recording apparatus, which is in contact with the end surface of the magnetic recording disk only when the magnetic recording disk is stopped, and the other part of which is connected to a magnetic recording apparatus housing made of a conductor having a resistivity of 100 Ωcm or less. 2. The magnetic recording apparatus according to claim 1, wherein the conductor contacting the end face of the magnetic recording disk only when the magnetic disk is stopped is an arc-shaped conductive metal body having a resistivity of 1 Ωcm or less. 3. The magnetic recording apparatus according to claim 1, wherein the conductor contacting the end face of the magnetic recording disk only when the magnetic disk is stopped is a leaf spring-shaped conductive metal body having a resistivity of 1 Ωcm or less. 4. A magnetic recording apparatus of a type having a magnetic head and a rotating magnetic recording disk, wherein the magnetic head and the magnetic recording disk temporarily or steadily contact each other, and a portion of a slider of the magnetic head which does not contact the magnetic disk. A magnetic recording device in which one of conductive lines having a resistivity of 100 Ωcm or less and a thickness of 0.1 mm or less is connected to the other, and the other is connected to a support of a recording head electrically connected to a magnetic recording device housing having a resistivity of 100 Ωcm or less. . 5. A magnetic recording device of a type having a magnetic head and a rotating magnetic recording disk, wherein the magnetic head and the magnetic recording disk temporarily or steadily contact each other, and a portion of the slider of the magnetic head which does not contact the magnetic disk. A magnetic recording device in which one of conductive lines having a resistivity of 100 Ωcm or less and a thickness of 0.1 mm or less is connected to, and the other is connected to a magnetic recording device housing having a resistivity of 100 Ωcm or less. 6. A magnetic recording device of a type having a magnetic head and a rotating magnetic recording disk, wherein the magnetic head and the magnetic recording disk are in contact with each other temporarily or steadily, and the rotary shaft of the innermost peripheral portion of the magnetic recording disk. , Or the outermost surface of the part that comes into contact with the jig for fixing to the rotating shaft has a resistivity of 1
A rotating shaft, a jig for fixing the magnetic disk to the rotating shaft, a bearing for supporting the rotating shaft in the magnetic recording device housing, and a magnetic recording device housing, which are covered with a conductive material having a thickness of 00 Ωcm or less and a thickness of 100 μm or less. All bodies have a resistivity of 100Ω
A magnetic recording device formed of a conductive material having a size of 1 cm or less. 7. A resistivity of 100 .OMEGA.cm or less and a thickness of 100 covering the outermost surface of the innermost peripheral portion of the magnetic recording disk or a portion in contact with a jig for fixing the innermost peripheral portion of the magnetic recording disk.
Conductive materials of μm or less are aluminum, copper, silver, gold,
7. The magnetic recording device according to claim 6, which is formed of an alloy of one or more of platinum, tin, nickel, chromium, manganese, magnesium, and iron. 8. A resistivity of 100 .OMEGA.cm or less and a thickness of 100 covering the outermost surface of the rotating shaft of the innermost peripheral portion of the magnetic recording disk or a portion in contact with a jig for fixing to the rotating shaft.
7. The magnetic recording device according to claim 6, wherein the conductive material having a thickness of μm or less is formed of any one of tin oxide, indium oxide, and cadmium tin oxide. 9. A magnetic recording device comprising a magnetic head and a rotating magnetic recording disk, wherein the magnetic head and the magnetic recording disk temporarily contact each other when the magnetic recording disk rises and falls when it rotates. Separate the recording area on the disc from the area where the recording head slides,
A magnetic recording device in which a carbon-based protective film containing 5% or more by mass of a graphite component is formed in a sliding region. 10. An area on the surface of the magnetic recording disk on which the magnetic head slides is an area within 30 mm in the radial direction from the innermost circumference to the outer circumference of the magnetic recording disk, and the magnetic recording is performed in that area. A carbon-based protective film is formed on the magnetic film of the disk, and the carbon-based protective film is formed by continuously reducing the graphite component from the innermost circumference to the outer circumference, and the magnetic recording disk After the start of the rotation of the magnetic recording disk, the magnetic head gradually moves from the innermost circumference toward the outer circumference as the rotation speed increases, and the magnetic head moves from the innermost circumference to the radial direction 30.
A magnetic recording apparatus having an operation of levitating from the surface of a magnetic disk within mm. 11. A magnetic recording device of a type having a magnetic head and a rotating magnetic recording disk, wherein the magnetic head and the magnetic recording disk are in contact temporarily or constantly.
A magnetic recording disk, a conductive non-magnetic substrate having a resistivity of 100 Ωcm or less, and a magnetic film formed on the non-magnetic substrate;
A protective film formed on the magnetic film, and the nonmagnetic substrate is the outermost surface of the magnetic recording disk within 10 mm in the radial direction from the innermost circumference in contact with the rotation axis of the nonmagnetic substrate to the outer circumference. And a magnetic recording device formed such that the innermost end face of the protective film is in contact with the non-magnetic substrate. 12. A magnetic recording apparatus comprising a magnetic head and a rotating magnetic recording disk, wherein the magnetic head and the magnetic recording disk temporarily contact each other when the magnetic recording disk rises and falls when it rotates. The magnetic recording generated by the rotation of the magnetic recording disk is in contact with a contact formed by a conductive material having a resistivity of 100 Ωcm or less, which is electrically connected to a magnetic recording device housing having a resistivity of 100 Ωcm or less in advance. The contact formed by the conductive material by the air flow on the disk surface and the magnetic head levitate at the same rotation speed at the same time, and the contact formed by the conductive material at the same rotation speed even when the magnetic recording disk rotation falls. Magnetic recording apparatus having a mechanism in which a magnetic head contacts a magnetic recording disk . 13. A magnetic recording apparatus comprising a magnetic head and a rotating magnetic recording disk, wherein the magnetic head and the magnetic recording disk temporarily contact each other when the magnetic recording disk rises and falls when it rotates. A resistivity of 100 Ωc, which is electrically connected to a magnetic recording device casing having a resistivity of 100 Ωcm or less in advance on the outermost end face of the disk.
A contact made of a conductive material of m or less is in contact with the magnetic head, and a contact made of a conductive material causes the magnetic head to be magnetized by the flow of air on the outermost peripheral end surface of the magnetic recording disk generated by the rotation of the magnetic recording disk. A contact made of a conductive material that levitates below the rotational speed at which it floats from the disk surface, and that contacts the magnetic disk end face at a rotational speed below the rotational speed at which the magnetic head contacts the magnetic disk surface even when the magnetic recording disk rotation falls. A magnetic recording device comprising. 14. A magnetic recording device of a type having a magnetic head and a rotating magnetic recording disk, wherein the magnetic head and the magnetic recording disk are in contact temporarily or constantly.
A disk whose surface is covered with a polymer material that is attached to the rotating shaft of a magnetic recording disk and that rotates together with the magnetic recording disk, and a sliding plate whose surface is covered with a polymer material that is fixed to the housing of the magnetic recording device A magnetic recording device comprising a mechanism for pressing with a weak force of 0.03 N or less. 15. A magnetic recording apparatus of a type having a magnetic head and a rotating magnetic recording disk, wherein the magnetic head and the magnetic recording disk are in contact temporarily or constantly.
The support system of the magnetic head is designed to move parallel to the recording surface of the magnetic recording disk by the rotating shaft, and the supporting system of the magnetic head is attached to the side surface or the bottom surface of the rotating shaft for moving the magnetic head. A part whose surface is covered with a polymer material is attached to
Further, a mechanism in which a plate made of a polymer material, one of which is fixed to the housing of the magnetic recording device, presses with a weak force of 0.03 N or less against the polymer material attached to the rotating shaft to which the support system of the magnetic head is attached A magnetic recording device comprising: 16. A magnetic recording apparatus of a type having a magnetic head and a rotating magnetic recording disk, wherein the magnetic head and the magnetic recording disk are in contact temporarily or constantly.
Magnetic recording device A magnetic recording device having a built-in static eliminator that generates positive ions or negative ions at a position where it does not come into contact with a rotating magnetic recording disk inside a housing. 17. A magnetic recording apparatus of a type having a magnetic head and a rotating magnetic recording disk, wherein the magnetic head and the magnetic recording disk are in contact temporarily or constantly.
A metal disk whose surface is covered with a polymer material or a disk formed with a polymer material is attached to a rotating shaft for rotating a magnetic disk, and a metal disk or a polymer whose surface is covered with a polymer material A magnetic recording device in which a disk made of a material and a magnetic disk incorporate a mechanism that rotates at the same rotation speed. 18. A metal disk whose surface is covered with a polymer material or a disk formed of a polymer material and magnetic disks are alternately mounted on the same rotary shaft at predetermined intervals. The magnetic recording device described. 19. The polymer material is nylon, cellulose, cellulose acetate, polymethylmethacrylate, polyacetal, polyethylene terephthalate, polyacrylonitrile, polyvinyl chloride, polyvinylidene chloride, polystyrene, polyethylene, polypropylene, polytetrafluoroethylene, acrylonitrile. 19. A butadiene-styrene copolymer comprising one or more materials.
The magnetic recording device described.