JP2597633B2 - Magnetic recording device - Google Patents

Description

The present invention relates to a magnetic recording device, and more particularly, to a magnetic recording device that performs recording, reading, storage, reproduction, and the like using a magnetic tape. In the improvement of the tape guide of the magnetic tape in the above.

(B) Conventional technology Conventionally, magnetic recording devices using a magnetic tape as a magnetic medium have been widely used in the fields of computers, audio, VTRs, and the like. This magnetic recording device basically consists of a magnetic tape drive and a magnetic head, but since the track pitch of the magnetic tape is smaller than other recording media, in order to precisely regulate the relative position between the magnetic tape and the head. A tape guide (usually made of stainless steel) is used.

(C) Problems to be Solved by the Invention In such a magnetic recording device, the same location of the magnetic medium is often used repeatedly, and as the number of uses increases, so-called dropout or relative speed between the magnetic tape and the magnetic head increases. , That is, the jitter increases, and clogging of the magnetic head tends to occur. This is because the magnetic medium is used in sliding contact with a tape guide or the like, and the medium is damaged by repeated use.

On the other hand, with the recent increase in recording density of magnetic media,
In the method using a magnetic tape, the shortest recording wavelength of 0.6 μm is achieved by increasing the Hc and smoothing the magnetic medium. Therefore, a slight loss or dent (several hundred squares) of the magnetic medium causes a loss of the signal, which causes the dropout to be promoted. In addition, erroneous detection of a signal due to, for example, jitter induced by vibration of a magnetic medium cannot be ignored due to the increase in recording density. Therefore, it is desired to configure the device so that the magnetic tape is not damaged as much as possible.

However, in the above magnetic tape type magnetic recording apparatus, a tape guide often needs to be installed on the medium side of the magnetic tape due to the configuration of the tape path.
In this case, the magnetic tape contacts the tape guide,
There is a disadvantage that the medium is seriously damaged and the life of the medium is significantly shortened. Further, since the magnetic tape has high hardness and partially contains an abrasive, the tape guide is worn away, and there is a disadvantage that the original purpose of the tape guide, that is, the tape cannot be accurately regulated. Further, since the magnetic tape moves while sliding on the tape guide, there is a problem that the friction between the two increases the jitter of the tape.

The present invention has been made in order to solve the drawbacks of the conventional magnetic recording apparatus. In particular, a magnetic recording apparatus in which the damage of a magnetic tape as a magnetic medium is small and the occurrence of dropout and jitter is remarkably suppressed. It is something to offer.

(D) Means for Solving the Problems From the above viewpoints, the present inventors have conducted intensive research on the improvement of the tape guide in the magnetic recording device, and have particularly studied the application of a ceramic material. As a result, the use of a conductive ceramic mainly composed of zirconia and metal carbide (Japanese Patent Application Laid-Open No. 60-103078) as a tape guide material significantly suppresses the occurrence of dropout and jitter during tape running. Further, they have found that the results are superior to the ceramic material composed of stabilized zirconia and metal oxide, and have reached the present invention.

According to the present invention, in the magnetic recording apparatus of a magnetic tape-type, sliding surfaces of the tape guides the magnetic surface of the magnetic tape is in sliding contact, TiC, NbC, TaC, Cr 3 C 2, ZrC, Mo 2 C, the WC carbides components 17.5 to 40.0% by volume of at least 1 or more, the balance is 2 mol% or more Y ₂ O _3, MgO, or Y ₂ O ₃ and ZrO _2, which is partially stabilized with MgO as a main component, wherein The specific resistance value of the sliding contact surface is 0.
63 × 10 ^{-3 to} 17.2 × 10 ^-3 Ωcm, with a hardness of 90.8 to 91.8, a porosity of 0.2 to 0.12 and a coefficient of friction of 0.25 to 0.28 Provided is a magnetic recording device.

The magnetic tape type magnetic recording device of the present invention is a device comprising a magnetic material coated tape for recording and reproducing data and an electromagnetic transducer (magnetic head), and is used for image processing, sound processing, external storage of a computer, and the like. Can be

The tape guide in the present invention is a member for accurately transporting the magnetic tape to a predetermined position of the magnetic head,
Precisely regulate the position and direction of the running magnetic tape. This tape guide usually includes a guide pole portion that slides on the surface of the magnetic tape and a tape edge support portion that slides on the edge portion of the magnetic tape. The guide pole portion is rotatable with respect to the tape edge support portion. May be attached, fixedly attached, or integrally molded.

In the tape guide according to the present invention, at least the sliding surface of the tape guide is made of a conductive ceramic material mainly composed of zirconia and metal carbide. Here, zirconia means at least 2 mol% of CaO, MgO, Y ₂ O ₃ , CeO, etc.
The solid solution is less than 1% monoclinic and the rest shows partially stabilized zirconia having a tetragonal and cubic structure. One preferable example is 2 to 5 mol% in Y ₂ O _{3 and} 2 to 5 mol% in MgO. 5-10 mol%, 4-9 mol% in CaO, CeO
In the above, ZrO ₂ dissolved in a solid solution of 8 to 20 mol% can be used. On the other hand, metal carbides are TiC, NbC, TaC, Cr ₃ C ₂ , Zr
C, Mo ₂ C and WC can be used.
It is preferable to use at least one or more of carbides of the Va, Va, and VIa groups. Here, the compounding amount of the metal carbide is suitably set to 17.5 to 40% by volume. As long as the effects of the present invention are not impaired, other ceramic constituents may be contained in the ceramic material constituting the tape guide. For example, up to 2% by weight of the zirconium component (ZrO ₂ )
Substitution with Al ₂ O ₃ is also one preferred embodiment. Of these, the metal carbide component is 17.5 to 40% by volume and the balance is Y ₂
ZrO partially stabilized with at least 2 mol% of O ₃ or MgO
_It is most preferable to use a ceramic having a specific resistance of 0.5 × 10 ^{−3 to} 60 × 10 ⁻³ Ωcm.

Such a ceramic can be produced by mixing components such as zirconia, a stabilizer and a metal carbide, and subjecting the mixture to sinter molding by an ordinary method. Here, sintering is suitably performed by hot pressure sintering in a non-oxidizing atmosphere, and is usually performed by a hot press method performed at a temperature of 1300 to 1650 ° C. and a pressure of 50 kg / cm ² or more. It is preferably performed by an isotropic pressure sintering (HIP) method performed at a temperature of 1200 to 1650 ° C. and a pressure of 500 kg / cm ² or more.

FIG. 1 shows an application example of the present invention. FIG. 1 is an enlarged perspective view around a magnetic head in one embodiment of the magnetic recording apparatus of the present invention. As shown in the figure, the tape guide 1 is composed of a guide pole 2 and a tape edge supporting portion 3, and is formed and assembled from a conductive zirconia sintered material. The magnetic tape 4 is slid in contact with the tape edge support portion 3 at the upper and lower tape edges so as not to vibrate in the width direction. It is guided with high precision to.

(E) Function The magnetic recording device of the present invention is provided with conductivity by containing metal carbide, suppresses generation of static electricity at the time of friction, eliminates adhesion of dust, and damages the magnetic surface of the tape. Without giving it, charging noise can be removed.
Further, since the magnetic recording device of the present invention has a tape guide having a low coefficient of friction and excellent wear resistance, even if the magnetic tape slides on the surface of the magnetic recording medium and runs repeatedly, the magnetic tape may be damaged. The magnetic tape running is less likely to vibrate because of less wear and less wear.

(F) Example Next, the present invention will be illustrated by way of an example. However, this is an example in which the present invention is embodied, and does not limit the technical scope.

The examples of the present invention were evaluated by the following measurement methods. Was determined by hardness ...... JIS Rockwell hardness H _R A (JISZ22
Rockwell hardness A scale specified in 45).

Porosity: Determined by subjecting a test piece to mirror lap finishing and then analyzing all from a fine spot to a large spot with an image analyzer.

Specific resistance: Determined by measuring electric resistance by the direct current four-point probe method, that is, the four-terminal method. Gold was vapor-deposited on the electrodes, and copper wires were applied with silver paste.

Coefficient of friction: A magnetic tape medium is wrapped around a cylindrically shaped test piece so that the angle becomes 90 degrees, one of the magnetic tapes is pulled in the horizontal direction, and the force required for the magnetic tape to continue moving. Was determined by measuring.

Example 1 Partially stabilized ZrO ₂ containing 3 mol% of Y ₂ O ₃ and 72.5 vol%
NbC at 27.5% by volume under a non-oxidizing atmosphere at a pressure of 200
A tape guide as shown in (1) of FIG. 1 was manufactured from a material sintered by a hot press method at a temperature of 1500 ° C. at kg / cm ² . This tape guide is Rockwell hardness H _RA = 91.
7, Porosity 0.04% by volume Specific resistance 6.0 × 10 ^-3 Ωcm, Coefficient of friction
It was 0.27. Next, a magnetic recording device with this tape guide was prepared, and digital signals were recorded in advance (64K
The same magnetic recording signal of a magnetic tape on which a bit / inch, 8-10 modulation shortest recording wavelength is 0.63 μm) is repeatedly reproduced by this magnetic recording / reproducing apparatus, and a symbol error rate (one symbol is 8 data bits) and a drop in each reproduction. The output rate (reproduced signal level is a required value V _0, that is, the ratio of symbols whose level is lower than the threshold level) is measured after the reproduced signal output from the reproducing head is amplified and processed by a digital circuit. Shown in the figure. According to FIG. 2, in the magnetic recording apparatus using the tape guide of the present invention, the symbol error rate was not increased even when the same magnetic recording medium surface of the magnetic tape was repeatedly reproduced more than 1000 times. Met.

Example 2 In Example 1, instead of using 72.5 vol% of partially stabilized ZrO ₂ containing 3 mol% of Y ₂ O ₃ and 27.5 vol% of NbC,
As shown in Table 1, a magnetic recording apparatus was manufactured in the same manner as in Example 1 by blending 25 to 40% by volume of various metal carbides of Groups IVa, Va and VIa of the periodic table. As shown in Table 1, the physical properties of the guide poles are all good values. Even if the same magnetic recording medium surface of the magnetic tape is repeatedly reproduced more than 1000 times, no increase in the symbol error rate is observed. Excellent results.

Comparative Example 1 In Example 1, a magnetic recording apparatus was manufactured in the same manner as in Example 1 except that a conventional tape guide made of stainless steel (SUS304) was used instead of using the tape guide of the present invention. The symbol error rate and dropout rate were measured, and the results are shown in FIG. According to FIG.
In the conventional magnetic recording device, the frequency of occurrence of the symbol error rate and the dropout rate increases after about 300 repetitive reproductions of the same magnetic recording medium surface of the magnetic tape,
The number of times of repetitive reproduction for obtaining a good signal stably was small.

(G) Effects of the present invention As described in detail above, according to the present invention, even if the number of repetitive uses of the same magnetic medium of a magnetic tape on which a digital signal has been recorded in advance by the magnetic recording apparatus of the present invention increases, dropout can occur. It is possible to obtain a magnetic recording apparatus which does not increase the jitter or jitter and does not cause clogging of the head.

[Brief description of the drawings]

FIG. 1 is an enlarged perspective view around a magnetic head of a magnetic recording device manufactured in an embodiment of the present invention. FIG. 2 is a graph showing a result of measurement when the magnetic recording device of the present invention is repeatedly reproduced, and FIG. 3 is a graph showing a similar measurement result using a conventional magnetic recording device. 1 Tape guide, 2 Guide pole, 3 Tape edge support, 4 Magnetic tape, 5 Magnetic head.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Toru Okuda 22-22, Nagaikecho, Abeno-ku, Osaka-shi, Osaka Inside Sharp Corporation (72) Inventor Kei Yoshino 2--20-31 Shimizu, Minami-ku, Fukuoka-shi, Fukuoka Japan Inside Tungsten Co., Ltd. (72) Inventor Toshige Sasaki 2-20-31 Shimizu, Minami-ku, Fukuoka City, Japan Inside Tungsten Co., Ltd. (56) References JP-A-50-130111 (JP, A) JP-A-60-1003078 (JP, A) Jiko 62-41367 (JP, Y2)

Claims (1)

(57) [Claims] In a magnetic recording apparatus of a magnetic tape type, a sliding surface of a tape guide on which a magnetic surface of a magnetic tape slides,
_{TiC, NbC, TaC, Cr 3} C 2, ZrC, Mo 2 C, and carbide components 17.5 to 40.0% by volume of at least one or more of WC, the balance is more than 2 mol% Y ₂ O _3, MgO or Y Partially stabilized with ₂ O ₃ and MgO
ZrO ₂ as a main component, the specific resistance value of the sliding contact surface is 0.63 × 10 ^-3
~ 17.2 × 10 ^-3 Ωcm, hardness 90.8 ~ 91.8, porosity 0.02 ~
A magnetic recording device comprising a tape guide made of conductive ceramics, wherein the tape guide has a coefficient of friction of 0.12 and a coefficient of friction of 0.25 to 0.28.