JPS61104473A - Pressure pad device - Google Patents

Abstract

PURPOSE:To avoid storage of static electricity and frictional heat to a magnetic recording medium by using a conductive fiber to a pad (pad material) for magnetic tape and discharging the static electricity and the frictional heat produced by friction via the pad material. CONSTITUTION:A conductive fiber is used to a pad 3 for magnetic tape. This fiber is obtained by giving the adsorption and coordinate bond of univalent copper ions to an acrylonitrile fiber. Otherwise a composite fiber containing a conductive metal dispersed into an organic matter such as nylon, etc. is also available together with a composite fiber obtained by weaving a metallic fiber into an organic matter such as a carbon fiber, etc. and a composite fiber obtained by weaving a conductive amorphous metallic fiber into an organic matter like nylon, etc. The up-down width of the pad 3 is larger than that of a magnetic tape 2 and therefore the upper and lower ends of the pad 3 swelled over the tape 2 is pressed directly to a part of a rubbing surface 5a of a magnetic head 5. As a result, the static electricity (charge of static electricity) and the heat produced by friction are shunted to the head 5.

Description

Detailed Description of the Invention (Technical Field) The present invention relates to a pressing pad device for pressing a magnetic recording medium against a magnetic head.

(Prior art) Conventionally, magnetic particles, dust, dirt, etc. that adhere to the magnetic surface and base film surface of magnetic recording media such as magnetic tape due to static electricity significantly deteriorate signal input/output characteristics, S/N ratio, etc. It is known to lie. This is because static electricity is generated due to the friction caused when a magnetic recording medium such as a magnetic tape slides against a magnetic head and a magnetic recording medium pad, which generates magnetic particles and dust.

This is because dust, dirt, etc. adhere to the surface.

This type of magnetic recording medium pad is, for example, a magnetic tape pad provided on a magnetic tape cassette.This magnetic tape pad is generally made of insulating fibers hardened into blocks. Its function is to press the magnetic tape against the sliding surface of the magnetic helade on which it slides during recording and playback, thereby ensuring complete contact between the two and ensuring that the magnetic head can obtain good recording and playback output. It is.

By the way, during recording and playback, the friction caused by sliding between the magnetic tape and the magnetic head, and between the magnetic tape and the magnetic tape pad generates not only static electricity but also frictional heat.
Due to increased adhesion of powder, dust, dirt, etc., the magnetic tape may stick tightly to the sliding surface of the magnetic head. In this case, it becomes impossible to record and reproduce normal signals.

Therefore, it has been desired to reduce as much as possible the static electricity and frictional heat generated by the vibration between the magnetic tape pad and the base film surface of the magnetic recording medium C. Incidentally, such a phenomenon occurs not only with magnetic tape cassettes but also with other magnetic recording media and pads for magnetic recording media.

(Purpose) The present invention has been made in view of the above-mentioned problems, and includes magnetic powder on the surface of a magnetic recording medium such as a magnetic tape.

It does not attract dirt, dust, dirt, etc., and also improves input/output characteristics and S/N.
The purpose of this is to maintain a good ratio without deteriorating the ratio and to prevent the magnetic recording medium from sticking to the magnetic head. To this end, it is necessary to reduce static electricity and frictional heat generated by sliding between the magnetic tape pad and the magnetic recording medium.

For these purposes, in the present invention, conductive fibers are used for the magnetic tape pad (pad material),
By causing static electricity and frictional heat generated by friction to flow out through the pad material, static electricity and frictional heat are prevented from being accumulated on the magnetic recording medium.

(Example) Hereinafter, the present invention will be described in detail with reference to the attached drawings.

FIG. 1 shows a front view of the side facing the magnetic head when a magnetic tape cassette using a pressure pad according to the present invention is installed in a magnetic recording/reproducing apparatus.

On the inside of the side surface of the magnetic tape cassette case 1 shown in the figure, a magnetic tape 2 wound around two reels (not shown) inside the case 1 is stretched. When the magnetic tape cassette is installed in a magnetic recording/reproducing device, an opening 16 is provided in the center of the side surface facing a magnetic head (not shown) for bringing the sliding surface of the magnetic head into contact with the magnetic tape 2. The aforementioned magnetic tape pad 3 is provided in contact with the back of the central portion of the magnetic tape 2 facing the opening 1a. The magnetic tape pad 3 is made up of fibers cut into blocks, and is formed into a rectangular parallelepiped shape as shown in FIG. is formed larger than the width of the magnetic tape 2 so that it touches the entire width of the magnetic tape 2 in the same direction with a margin. Further, as shown in the same figure, a magnetic tape pad (3) is fixed to the center portion of a band-shaped thin metal plate 4 having elastic properties by a method such as adhesion.

During recording and reproduction, as shown in FIG. 3, the sliding surface 5a side of the magnetic head 5, which is provided with tape guides 6 on both sides for guiding the running of the magnetic tape 2, is inserted into the case l through the aforementioned opening 1a. , a magnetic pad 5 presses the magnetic tape pad 3 via the magnetic tape 2. As a result, the metal plate 4 supporting the magnetic tape pad 3 is burned inside the case 1 due to its elasticity. And this grind is ± gold.
Vane plate, 4J2) The magnetic tape pad 3 is brought into pressure contact with the sliding surface 5a of the magnetic head 5 via the magnetic tape 2 due to the repulsive force.

Here, since the width dimension in the vertical direction of the number ζ magnetic tape pad 3 mentioned earlier is larger than that of the magnetic tape 2, the upper and lower ends of the magnetic tape pad 3 protruding above and below the magnetic tape 2 are the magnetic heads. It comes into direct pressure contact with a part of the sliding surface 5a of No.5.

This embodiment is characterized in that the magnetic tape pad 31 is made of conductive fiber.

In the material, monovalent copper ions are adsorbed and coordinately bonded to acrylonitrile fibers to provide conductivity. That is, when a divalent copper compound is reduced to monovalent copper ions in acrylonitrile fiber using a reducing agent such as hydroxylamine chloride, copper ions (Cu+) are adsorbed to cyan groups (-CN) in the acrylonitrile fiber.・It forms a coordinate bond as shown below and has a specific resistance of 10-1 to 10-5 Ωα and conductivity.

-C)(, -CH--Cf(, -CN-CN
CN i Cu+Cu+ CN -Cf(2-CH- CHt CH-CH2-CH-' Cu+I This is not limited to acrylonitrile, but any material having a cyano group can be easily imparted with conductivity.

In addition to the above examples, examples of conductive fibers used in magnetic tape pads include composite fibers in which conductive metals are dispersed in organic substances such as nylon, polyester, and acrylonitrile, carbon fibers, and nylon and polyester. - There are composite fibers in which metal fibers are woven into an organic material such as acrylonitrile, and composite fibers in which conductive amorphous metal fibers are woven into an organic material such as Nairobi polyester and acrylonitrile. The organic substances used in these composite fibers may be either natural or artificially synthesized.

In this way, if conductive fibers are used for the magnetic tape pad 3, the magnetic tape pad 3 and the magnetic tape 2
Static electricity and frictional heat generated by sliding between the magnetic tape pad 3 and the magnetic tape 2 are prevented from being accumulated in the magnetic tape pad 3 and the magnetic tape 2.
flows into the shield case via the sliding surface 5a.

(Effects) As described in detail above, according to this embodiment, due to the use of conductive fibers in the magnetic tape pad 3), and due to the sliding movement between the magnetic tape 2 and the magnetic tape pad 3, Even if static electricity and frictional heat are generated due to friction,
It can efficiently flow out to the shield case of Magnetic Herad 5. As shown in Fig. 2, the width of the magnetic tape pad 3 in the vertical direction is larger than that of the magnetic tape 2, so the upper and lower ends of the magnetic tape pad 3, which protrude above and below the magnetic tape 2, are magnetic heads. A part of the sliding surface 5a of 5, that is, by directly pressing against the shield case, static electricity (charge) and heat generated by friction are released to the magnetic heald 5. This prevents the magnetic recording medium from being charged and prevents the adhesion of magnetic powder, dirt, dust, dirt, etc., so it is possible to prevent signal input/output caused by the adhesion of magnetic powder, dirt, dust, dirt, etc. Deterioration of characteristics and SN ratio can be prevented. This is because the shield case becomes the ground side through the magnetic recording/reproducing device.

[Brief explanation of the drawing]

1 is a front view of a magnetic tape cassette provided with a pressure pad according to an embodiment of the present invention, on the side facing the magnetic bed; FIG. 2 is an enlarged perspective view showing the vicinity of the pressure pad in FIG. 1; The figure is an explanatory diagram showing a state in which the pressing pad in FIG. 1 is in pressure contact with the magnetic head. 1... Case 1a... Opening 2
······Magnetic tape

Claims (6)

[Claims] (1) A pressing pad device for pressing a magnetic recording medium against a magnetic head, characterized in that conductive fibers are used for the pad material that contacts the magnetic recording medium, and the pad material is brought into contact with the magnetic head. Pressure pad device. (2) The press pad device according to claim (1), characterized in that the pad material is a conductive fiber in which conductive metal ions are coordinated in an organic substance. (3) The press pad device according to claim (1), characterized in that the pad material is a composite fiber in which a conductive metal is dispersed in an organic substance. (4) The press pad device according to claim (1), characterized in that the pad material is made of carbon fiber. (5) The press pad device according to claim (1), characterized in that the pad material is a composite fiber in which conductive metal fibers are woven into an organic material. (6) The press pad device according to claim (5), characterized in that the pad material uses composite fibers woven with amorphous metal fibers.