JP2558802Y2 - Cleaning body for magnetic head - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cleaning body for a magnetic head, and more particularly to a cleaning body for a magnetic head which can remove only dirt attached to the surface of the magnetic head without abrasion. It is.

[0002]

2. Description of the Related Art A magnetic head mounted on a magnetic recording / reproducing apparatus for audio, video or computer is used for sliding with a magnetic tape. Debris and the like cause deposits and clogs between the magnetic head gaps, resulting in trouble in recording and reproduction. A tape-like or disk-like cleaning body having a polishing layer mainly composed of abrasive particles and a binder resin on a flexible support is used to remove deposits or clogs on the surface of the magnetic head. Have been.

A cleaning body for a magnetic head having the above-mentioned polishing layer usually not only removes deposits and clogs on the magnetic head, but also removes magnetic particles since the polishing layer contains fine alloy particles and fine abrasive particles. Side effects, such as wearing the head itself or changing the shape of the tip, were inevitable.

In recent years, a magnetic recording medium having a ferromagnetic metal thin film formed as a magnetic layer by a vacuum deposition method or a vacuum film forming method such as sputtering has been used in response to the trend of high density recording of the magnetic recording medium. As a result, the components of the deposits on the magnetic head have come to be different from the conventional ones. That is, the conventional deposit on the magnetic head is mainly composed of the binder resin component, which is the main component of the polishing layer. However, the magnetic recording medium having the ferromagnetic metal thin film as the magnetic layer does not contain the binder resin. Therefore, a substance attached to the magnetic head is mainly a lubricant mainly composed of a low molecular organic compound or a metal thin film fragment.

Further, in order to meet the demand for high-density recording, the allowable amount of wear of the magnetic head, that is, the effective height of the magnetic head tends to decrease, and the magnetic head does not wear without deforming the tip shape. It has been strongly desired to effectively remove only deposits and clogs on the surface. Also, it has become necessary to remove lubricant and metal thin film fragments peculiar to a magnetic recording medium having a ferromagnetic metal thin film as a magnetic layer.

The conventional cleaning tapes for magnetic heads disclosed in JP-A-61-123012 and JP-A-61-261809 cannot sufficiently cope with such a demand. In many of these magnetic head cleaning tapes, the flexible support is made of plastic such as PET.
As disclosed in Japanese Unexamined Patent Publication No. 9-93, cloth and
As disclosed in JP-A-162-162 and JP-A-3-88653, there is a polishing tape and a wrapping tape which are paper. Wear and deformation of the head could not be avoided. Further, low molecular organic compounds such as lubricants could not be sufficiently removed.

[0007] A cleaning body which does not use abrasive particles has also been proposed.
No. 6, JP-B-52-8420, JP-B-52-8421, JP-B-55-54820, JP-A-52-166530, and JP-B-61-28252.
And Japanese Patent Application Laid-Open No. 62265 disclose a cleaning tape for cleaning with a fibrous substance such as a nonwoven fabric. Japanese Utility Model Application Laid-Open No. 60-89612, Japanese Utility Model Application Laid-Open No. 59-66919, Japanese Utility Model Application No. 25
No. 97 discloses a cleaning body in which a net-like or lattice-like pattern is provided on a support, but with these cleaning tapes, there is almost no polishing of the magnetic head, but the adherence of substances adhering to the magnetic head is reduced. Removal was limited and inadequate.

A magnetic head cleaner for polishing with paper such as Japanese paper is also disclosed in Japanese Utility Model Laid-Open Publication No. 50-51604. However, in paper such as Japanese paper, the fiber layer is usually pressed by a calender or the like. Therefore, the stiffness was weak and the deposits could not be sufficiently removed.

Further, Japanese Patent Application Laid-Open No. 1-176309 discloses a cleaning tape for a magnetic head having a limited stiffness. However, since abrasive particles are used, wear of the magnetic head can be avoided. could not.

[0010]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and provides a magnetic head cleaning body capable of effectively removing only deposits without abrasion of the magnetic head. The purpose is to:

[0011]

SUMMARY OF THE INVENTION An object of the present invention is to mainly use vegetable fibers, to have a stiffness of 0.3 to 10.0 g, and to have a center line average surface roughness Ra (cutoff value 0.8 mm) of a cleaning surface. This is achieved by a magnetic head cleaning body made of paper having a size of 1.0 to 6.0 μm. In addition,
The value of the stiffness is obtained by forming a ring of a measurement sample having a width of 8 mm and a length of 50 mm into a ring, and expressing a force required to give a displacement of 5 mm at a displacement speed of 3.5 mm / sec in (g). Value measured by the rigidity method.

Paper is made of a fibrous substance, and the fiber is mainly made of cellulose obtained from a plant, synthetic fiber, or a paper-like plastic such as polystyrene paper. The paper in the present invention is a paper mainly composed of cellulose obtained from a plant.

In the cleaning body of the present invention, the plant fibers such as cellulose of the paper have an appropriate hardness, and the surface properties of the paper are in a specific range. Since the contact area becomes moderate and the surface of the magnetic head is wrung with the cleaning body of the present invention, it is possible to effectively remove surface deposits without being worn. At the same time, since the stiffness is moderate, the contact with the surface of the magnetic head becomes appropriate, and the effect of removing extraneous matter is further enhanced.

Further, in a conventional cleaning tape comprising a binder and abrasive particles, the binder is softened at the friction temperature at the time of sliding of the head and adheres to the surface of the head. However, in the cleaning body of the present invention, the physical properties of the paper, that is, the paper does not soften at the friction temperature when the head slides, so that the cleaning effect does not change at the friction temperature. There is almost no damage to the head or head, so there is no risk of excessive wear. Furthermore, in the cleaning body of the present invention, a low-molecular liquid organic substance such as a lubricant can be absorbed between the fibers of the paper of the cleaning body. It can effectively remove dirt from the lubricant coming from the medium, and is also effective in removing dirt with the cleaning oil used in the final step of magnetic head manufacturing.

Further, the cleaning body for a magnetic head of the present invention is inexpensive because a conventional paper can be used as it is.

The paper used for the cleaning body of the present invention is
It is necessary that the stiffness and surface roughness are within the above specific ranges.For this purpose, in the manufacturing process, a certain pressure is applied to the plant fiber layer with a Yankee machine, super calender roll, etc. It is preferable that the paper is provided with surface properties and stiffness by adding a filler or glue. It is not preferable that the paper layer is maintained only by entanglement of the long fibers after making the paper, such as Japanese paper, because the stiffness and surface properties do not satisfy the conditions of the cleaning body of the present invention. Even if the paper contains some components other than plant fibers, there is no problem in achieving the object of the present invention if irregularities due to fiber entanglement appear on the surface of the paper. Further, it is preferable that fiber waste is not generated as much as possible.

The paper which can be used in the cleaning body of the present invention includes, for example, tracing paper, post card paper, parchment paper, paraffin paper and the like. preferable.

If the stiffness is within the above-mentioned range to provide the magnetic head cleaning body of the present invention, the paper can be provided with a backing support to enhance the durability.

The stiffness of the cleaning body for a magnetic head according to the present invention is as follows. The force required to give a displacement of 5 mm at a displacement speed of 3.5 mm / sec by making a measurement sample having a width of 8 mm and a length of 50 mm into an annular shape. It is a value measured by the annular bending stiffness method indicated by g), and is 0.3 to 10.0 g, preferably 2 to 8 g, more preferably 4 to 6 g.

If the stiffness is too small or too large, the contact with the magnetic head will not be appropriate, and
Deposits at the center of the magnetic head surface cannot be removed,
Further, the attached matter at the end cannot be removed.

The center line average surface roughness Ra of the cleaning surface of the cleaning body for a magnetic head of the present invention is 1.0 to 6.0 μm, preferably 1 to 5 μm at a cutoff value of 0.8 mm.
m, more preferably 1.5 to 4.5 μm.

If the surface roughness is too large, unevenness of the adhered matter is generated, and if it is too small, the adhered matter cannot be sufficiently removed.

The shape of the magnetic head cleaning body of the present invention is not particularly limited, and an arbitrary shape such as a tape shape or a disk shape can be selected.

Further, as long as the conditions of stiffness and surface roughness are in the above-mentioned ranges, the paper can be fixed on a specific support to obtain the cleaning body for the magnetic head of the present invention.

FIG. 1 is a cross-sectional view of a main part of a magnetic head cleaning body of the present invention having a tape-like shape. The tape-like magnetic head cleaning body 1 is made of a vegetable fiber 3 mainly composed of cellulose. It is entangled paper, and the surface of one surface 2 has irregularities due to entanglement of fibers, and has the above-mentioned surface roughness.

FIG. 2 is a schematic view of a polishing apparatus using the cleaning body for a magnetic head according to the present invention.

The magnetic head cleaning body 1 comprises:
When the tape take-up reel 7 rotates in the direction of arrow 4, the tape is taken out from the tape feed reel 6 in the direction of arrow in the figure. The magnetic head cleaning body 1 is brought into contact with the magnetic head 5 which is the object to be polished at a predetermined lap angle by a pass roll 8 on the traveling path, and cleans the tape sliding surface of the magnetic head 5.

The thickness of the cleaning element for a magnetic head of the present invention is 25 to 70 μm. The novel effects of the cleaning body for a magnetic head according to the present invention will be specifically described in the following examples.

[0029]

EXAMPLES (Example 1) Thickness 48 μm, stiffness 3.16 g, Ra2.
48μm tracing paper (manufactured by Mitsubishi Paper Industries Co., Ltd., product name: Starless Shikoku Copies, ultra-thin mouth, 35g /
m ² ) was slit into an 8 mm width, and a cleaning test was performed on the surface of the 8 mm VTR head. The 8 mm VTR head was used for both the case where a small amount of lubricant was previously attached and the case where the magnetic layer metal thin film fragments were attached by running an 8 mm evaporation tape. The cleaning test was performed by mounting the magnetic head on a polishing machine manufactured by Optoelectronics.

The cleaning was carried out for 10 seconds, and the stained state of the head was observed with a microscope. As a result, the lubricant and magnetic metal debris initially attached to the head could all be removed cleanly and completely.

(Example 2) The thickness of the tracing paper of Example 1 was 37 μm, stiffness 0.4 g, Ra 2.99 μm (trade name: Startless T246, Shikoku Copies, ultra-thin mouth, 22.5 mm)
g / m ² ) and a thickness of 45 μm, and a stiffness of 3.3.
g, Ra3.5 (trade name Startless T806 ・ 40g
/ M ² ), the cleaning effect was examined. Both the removal of the lubricant and the removal of the magnetic metal debris could be removed cleanly, and excellent results were shown.

The amount of head wear before and after the cleaning treatment in Examples 1 and 2 was measured, but the amount of wear was extremely small such that it could not be detected. Therefore, there was no difference in the shape of the head tip before and after cleaning.

(Example 3) Thickness 67 μm, stiffness 3.8 g, Ra 2.24 μ
m postcard paper (trade name FINE PAPE)
R · Kinyo W52.3 g / m ² ) and post card paper (trade name FI) with a thickness of 66 μm and a stiffness of 3.9
NE PAPER silver ring 52.3 g / m ² ) with a width of 8 mm
To form a cleaning tape.

The cleaning effect was evaluated in the same manner as in Example 1. As a result, both the removal of the lubricant and the removal of the magnetic metal thin film fragments were good, and no head wear or a change in the head tip shape due to cleaning could be detected.

The center line average surface roughness Ra (cutoff value mm) is PH266-0 manufactured by Kosaka Laboratory Co., Ltd.
1, measured using SPA-11. The tip shape of the magnetic head was measured by a Newton ring method using an optical flat glass.

Comparative Example 1 After forming a polishing layer mainly composed of α-iron oxide and a binder resin on a polyethylene terephthalate base having a thickness of 38 μm, a tape-shaped polishing body slit to a width of 8 mm was formed.
A cleaning test was performed under the same conditions as in the example. The lubricant and the small fragments of magnetic metal that had originally adhered to the surface of the magnetic head could not be completely removed and remained in spots. Further, it was confirmed that the shape of the tip of the magnetic head was unevenly worn. (Comparative Example 2) The following four types of tracing paper having different thicknesses, stiffnesses, and surface roughnesses Ra as shown below were slit to a width of 8 mm, and a magnetic head cleaning test was performed under the same conditions as in Example 1. went. (1) Sanyo Kokusaku Pulp Co., Ltd. High Cerastar; thickness: 55 μm, stiffness: 10.2 g, Ra:
3.9 μm (2) Pansy Tracein TS manufactured by Mitsubishi Paper Mills; thickness: 66 μm, stiffness: 3.0 g, Ra: 6.
2 μm (3) Silvia R manufactured by Sanyo Kokusaku Pulp Co .; thickness: 112 μm, stiffness: 0.2 g, Ra:
3.8 μm (4) SK refresh manufactured by Sanyo Kokusaku Pulp Co .; thickness: 85 μm, stiffness: 3.0 g, Ra: 0.
9 μm Initially, small pieces of lubricant and magnetic metal adhered to the surface of the magnetic head could not be completely removed and remained in spots. It was confirmed that the shape of the tip of the magnetic head was somewhat unevenly worn, though not as much as Comparative Example 1.

[0037]

According to the present invention, a cleaning body for a magnetic head made of paper having a stiffness of 0.3 to 10.0 g and a center line average surface roughness Ra (cutoff value of 0.8 mm) of at least one surface of 1.0 to 6.0 μm is used. By using
The cleaning of the magnetic head that can effectively remove only the surface deposits without wear can be performed at low cost.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part of a cleaning body for a magnetic head of the present invention.

FIG. 2 is a schematic view of a cleaning device loaded with the cleaning body for a magnetic head of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Magnetic head cleaning body 2 ... Cleaning surface 3 ... Magnetic head cleaning body 5 ... Magnetic head 6 ... Magnetic head cleaning body sending roll 7 ... Magnetic head cleaning body winding roll 8 ... Pass roll

Claims (1)

(57) [Scope of request for utility model registration] Claims: 1. Mainly vegetable fiber, with a stiffness of 0.
3 to 10.0 g, and the center line average surface roughness Ra (cutoff value 0.8 mm) of the cleaning surface is 1.0 to 6.0 μm
A magnetic head cleaning body made of paper. However, the value of the stiffness is represented by a ring (g) indicating the force required to give a displacement of 5 mm at a displacement speed of 3.5 mm / sec using a measurement sample having a width of 8 mm and a length of 50 mm as a ring. Value measured by the bending stiffness method.