JPS6116063A - Magnetic tape rubbing member - Google Patents

Abstract

PURPOSE:To prevent the injury to be inflicted on a magnetic tape or a tape rubbing member owing to the friction by forming a coating layer of tantalum pentoxide Ta2O5 over the rubbing surface of the tape rubbing member forming a magnetic tape drive system. CONSTITUTION:The rubbing frictional characteristics between a magnetic tape rubbing member and a magnetic tape 3 are improved for a back tension post 6, sloping posts 8 and 14, a magnetic head drum 13, etc. which constitute a drive system of the tape 3. For this purpose, a coating layer of tantalum pentoxide Ta2O5 is formed over the rubbing surface of the tape rubbing member. This can reduce the frictional coefficient between the tape rubbing member and the tape 3 to reduce the tape friction. Furthermore the stickiness of the tape 3 is eliminated even at high humidity. This secures a satisfactory driving state of a magnetic tape.

Description

TECHNICAL FIELD The present invention relates to a magnetic tape sliding member, and more particularly to a magnetic tape sliding member that reduces tape friction of a member that slides on a magnetic tape in a magnetic recording and reproducing device.

(Prior art) In recent years, technology regarding magnetic recording and reproducing devices has made remarkable progress.
In particular, the development of video tape recorder (hereinafter referred to as VTR) technology is remarkable. However, as is well known, in the current VTR systems, various systems such as the VHS system, the β system, the V-2000 system, and the CVC system, which are not compatible with each other, coexist and are widespread. As a result, an inconvenient problem arises in that users are confused about the above compatibility. Against this background, the so-called 8V is being developed as the next generation of VTRs.
Regarding millimeter VTRs, the standards have been completely unified among domestic and foreign manufacturers. The magnetic tape used in this 8mm VTR is either metal tape or vapor-deposited tape, and when the above metal tape is used,
If the magnetic tape running system (hereinafter referred to as tape running system) has a configuration similar to that used in conventional VTRs of various types, the magnetic tape running system (hereinafter referred to as the tape running system) can be constructed in the same way as the running system adopted in various types of conventional VTRs. The wear of the members with which the magnetic tape comes into sliding contact becomes significant.

On the other hand, when the vaporization tape described above, which has a thin film thickness and relatively low mechanical strength, is used, the following drawbacks occur. That is, in the same manner as in the past, for example, a fixed post made of stainless steel or a rotating drum made of aluminum alloy was used, and the tape winding angle was set to 210°K with respect to the rotating drum having a diameter of 40+w+. When configured, the magnetic tape sticks to the surface of the fixed post or rotating drum, and the coefficient of friction between the tape and the circumferential surface of the fixed post or rotating drum increases, causing uneven running speed of the magnetic tape. As a result, a problem arises in that the quality of the reproduction of art deteriorates. In particular, when a magnetic recording/reproducing apparatus is used in a high humidity atmosphere, the above-mentioned problems are more likely to occur. This type of problem under high humidity is also disclosed in Japanese Patent Application Laid-Open No. 58-98868 as a general problem of VTRs, and a tentative solution is also disclosed. That is, a higher fatty acid such as stearic acid, a higher fatty acid salt such as zinc stearate, a higher fatty acid amide such as stearic acid amide, and a reactive organic admixture such as silane cup link are applied to the surface of the tape sliding member. The sliding contact member is immersed in a treatment solution in which a substance such as an organic titanate ester is dissolved as a reactive organic titanium ester in a solvent, and the concentration is adjusted to about 1 grade, and then dried with high-speed hot air. In order to do this, a thin film layer made of the substance described above is formed on the surface of the member so that the sliding contact member has water repellency.

However, the thin film layer produced by the means disclosed above cannot withstand wear caused by running the tape for a long period of time, and is therefore impractical.

An example of a conventional VTR tape running system is shown below.
The running system is shown in Figure 1. That is, the magnetic tape 3 wound around the supply reel 2 housed in the video tape cassette 1 comes out from the reel and travels along the following path.

Cassette post 4 → Cassette post 5 → Bank tension post 6 → Rotating roller 7 → Inclined post 8 → Rotating roller 9 → Tape leader 10 → Full-width erase head 11 → Tape guide 12 → Magnetic head drum 13 → Inclined post 14 → audio eraser head 15 → audio/control 7}" 16 → boss l7 → capstan l
8 → Pin fo-ra 19 → Post 2O in the cassette → Post 21 in the cassette. Traveling along the above route, the tape 3 is wound up on the winding reel 22K stored in the cassette 1.

In such a running system, for example, the inclined boss}8
．． The sum of the winding angles of the magnetic tape 3 with respect to 14 is approximately 10
In order to be approximately 0°, the outer peripheral surface K of the post 8.14
Frictional resistance during tape running and post 8.1 above
The static friction force between the outer peripheral surface of tape 4 and the sliding surface of tape 3 becomes extremely large. This has caused problems such as uneven tape running speed and severe wear of both the boss 8j14 and the magnetic tape 80.

(Objective) The object of the present invention is to prevent damage to the magnetic tape and the magnetic tape sliding member due to friction even when a magnetic tape is loaded in a VTR and the magnetic tape is run. To provide a magnetic tape sliding contact member which allows the tape to run smoothly even when the tape is in contact with the magnetic tape.

(Summary) In order to achieve the above object, the present invention is characterized in that a coating layer made of tantalum pentoxide (Taz05) is formed on the sliding contact surface of a magnetic tape sliding contact member that constitutes a magnetic tape running system. It is.

(Example) Embodiments of the present invention will be described below based on the drawings.

The present invention provides, for example, the pack tension boss 6, inclined boss) 8.14, magnetic head drum 13, etc.
In order to improve the sliding friction characteristics between the magnetic tape sliding contact member (see figure) and the magnetic tape 3, a coating layer of tantalum pentoxide (T112O6) is formed on the sliding contact member.

First, the means for forming the tantalum pentoxide thin film will be described. For example, in order to form a coating layer on the aluminum alloy magnetic head drum 13, the drum is placed in a reaction sputtering device (not shown). The cathode of this device uses a 1gnetron type with a permanent magnet placed under the Ta target, and is 2X10'''7T.
After exhausting the air to below 'orr, argon gas was introduced into the chamber of the sputtering device at a partial pressure of 5
rr, and introduce an acid accumulation at a partial pressure of 1 x 10''''I'orr. Then, sputtering is performed to form a coating layer with a thickness of 0.5 μm. Applying this pressure, the pentaacid supplement is coated. drum for magnetic head 1
3a was created. Hereinafter, the stainless steel back tension post 6. A coating layer of tantalum pentoxide was formed on the sliding contact surface of the magnetic tape 3, which is the outer peripheral surface of the inclined posts 8 and 14.

Next, a means for measuring the coefficient of friction when using each member whose sliding surface is coated with pentoxide as described above will be described.

That is, FIG. 2 is a system diagram showing the friction coefficient measuring system 100, in which the magnetic tape 3 is connected to the supply reel 2 → fixed post 31 → guide roller 32 → fixed post 33 → tension analyzer post 34 → sample 35 → tensile strength. Revised analyzer post 36 → Fixed boss 37 → Pinch roller 38
It is rotated in the order of capstan 39 → guide roller 40 → fixed boss 41 → take-up reel 22.

Here, upper tension analyzer post 34.36
are provided with tension analyzers 42, 43 each having a tension gauge, and each of the analyzers 42, 43 is connected to each input end of a signal conversion circuit 44, 45, and further the conversion circuit 4
The respective output terminals of 4.45 are connected to the respective input terminals of the arithmetic circuit 46. Further, the mounting positions of the tension analyzer posts 34 and 36 are such that the interval between them can be changed, and when the interval is changed, the winding angle θ of the magnetic tee 130 with respect to the sample 35 changes. It looks like this.

Using the friction coefficient measuring system 100 as described above, for example, the magnetic head drum 1 can be measured instead of the sample 350.
3a, rotate the capstan 39,
The magnetic tape 3 held between the capstan 39 and the pinch roller 38 is run. When the wrapping angle between the drum 13a and the magnetic tape 3 is set to a predetermined angle θ, the tension T of the tape 3 on the side facing the drum 13a is measured by the tension analyzer 42.
Similarly, the tension analyzer 43 detects the tension T2 of the tape 3 on the side moving away from the drum 13a. And the signal conversion circuit 44°45
Then, the arithmetic circuit 46 calculates the friction coefficient μ obtained by the following equation.

p = in (T2/T I) / aIn addition, when performing the above-mentioned measurements, in order to keep the chromaticity and humidity constant, the friction coefficient measurement system 1 is used.
The entire 00 is placed in a constant temperature/humidity chamber of appropriate size for measurement.

Next, using the above-described friction coefficient measurement system 100, measurements were made under the conditions shown in the following table for cases in which the drum was coated with the pentaacid supplement (Ta2O5) and cases in which it was not coated. The magnetic tape used in the measurement was a vapor-deposited tape with cobalt nickel (CoNi) deposited on a base with a thickness of about 10 μm and a width of 80%.

Measurements were made under these conditions and the output of the arithmetic circuit 46 was graphed as shown in FIGS. 3 and 4. That is, when the magnetic head drum 13 made of an uncoated aluminum alloy is used, at a temperature of 24° C. and a humidity of 60%, the friction coefficient μ is as shown in the characteristic A1 shown in FIG. is approximately 0.25. On the other hand, in the case of the magnetic head drum 13a in which the magnetic head drum 13 is coated with tantalum pentoxide, under the same temperature and humidity, the characteristics are as shown in A2 shown in FIG. Friction coefficient μ is approximately 0.18
It becomes. By applying the above coating, the coefficient of friction was reduced by 0.07.

Furthermore, when the temperature is 26°C and the humidity is 90%, the coefficient of friction μ is 0.0% when coated with tantalum pentoxide as shown in the characteristics B1 and B2 shown in FIG.
It decreased by 0.17 from 35 to 0.18.

In this way, the above characteristic A1. A2 and characteristics Bl, B2
As is clear from the above, tantalum pentoxide is coached in
When compared with the case without the same tantalum coating, the coefficient of friction decreases under normal humidity, and no increase in the coefficient of friction is observed even under high humidity.

In addition, although the friction coefficient was measured using a vapor-deposited tape in this example, it is thought that the friction coefficient will be small similarly to this example even if it is measured using a metal tape.

(Effects) According to the present invention, since the coefficient of friction V between the sliding contact member and the magnetic tape can be reduced, the wear of the sliding contact member and the magnetic tape can be reduced. It is also possible to maintain good tape running without stickiness of the magnetic tape.

[Brief explanation of drawings]

Fig. 1 is a plan view showing an example of the tape running system of V'l'H. The second part is f! of the magnetic tape sliding contact member. FIG. 2 is a plan view showing a friction coefficient measurement system for determining the total friction coefficient. 3 and 4 are characteristic diagrams of the friction coefficient of the magnetic head drum measured by the friction coefficient reduction measuring system shown in FIG. 2 above. 3...Magnetic tape 6...Back tension printing post 8.14...Slanted post (fixed post) 13...Drum for magnetic head 13a...Drum for mountain air head coated with tantalum pentoxide 35 ···sample

Claims (7)

[Claims] (1) Tantalum pentoxide (Ta_
A magnetic tape sliding contact member characterized in that a coating layer made of 2O_5) is formed. (2) The magnetic tape sliding contact member according to claim 1, wherein the sliding contact member is a drum for a magnetic head around which the magnetic tape is wound. (3) The magnetic tape sliding contact member according to claim 2, wherein the drum is a rotating drum made of aluminum alloy. (4) The sliding contact member is a back tension post and/or
The magnetic tape sliding contact member according to claim 1, wherein the magnetic tape sliding contact member is a fixed post. (5) The magnetic tape sliding contact member according to claim 4, wherein the base material of at least one of the back tension post and the fixed post is a cylindrical stainless steel material. (6) The magnetic tape sliding contact member according to claim 4, wherein the base material of at least one of the back tension post and the fixed post is made of a light alloy and has a cylindrical shape. (7) The magnetic tape sliding contact member according to claim 1, wherein the tantalum pentoxide (Ta_2O_5) is coated by a reactive sputtering method.