JPS60138764A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To keep the ideal state in a running system with small friction coefficient by coating a tape slide face of a prescribed member with the thin layer made of a noble metal element such as Au, PT or Rh or their alloy in each member constituting a tape running system. CONSTITUTION:A substance is coated to the surface of a base 41 by the physical vapor-deposition method as a means forming the thin layer 42. As to a rotary drum, since the drum is constituted by coating a noble metal element on the base made of Al or plastic to constitute the drum; a problem produced with respect to the friction between the drum outer circumference face and the tape face is solved. The value of the friction coefficient is as small as 0.2-0.3. Since the thin layer is formed by using the alloys, a product rich in corrosion proof and prevented from tape sticking phenomenon in a humid environment is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a magnetic recording and reproducing device used in a video tape recorder (hereinafter abbreviated as VTR) and the like.

[Prior art]

In recent years, technology regarding magnetic recording and reproducing devices has made remarkable progress.
In particular, the development of VTR technology is remarkable. In this situation, the current VTR systems are VH3 system, β system,
Various incompatible systems, such as the V-2000 system and the CVC system, coexist and are widespread.

This creates an inconvenient problem of confusion on the user side. Against this background, the so-called 8 RAM is being developed as a next-generation model.
Regarding VTRs, complete standardization was achieved among manufacturers. The magnetic tape applied to this 8 m VTR is a metal tape or a vapor-deposited tape. Among these, when metal tape is applied, the magnetic tape (hereinafter simply referred to as tape) running system is used as a VTR of various conventional methods.
If the configuration is similar to that adopted in , the metal tape causes significant wear on various parts of the tape running system.

On the other hand, when a vapor-deposited tape with a thin film thickness and relatively low mechanical strength is used, various other problems arise. In other words, if a tape running system is constructed in the same manner as before, using a fixed post made of stainless steel or a rotating drum made of aluminum, and setting the tape winding angle to 210 degrees with respect to the rotating drum of φ = 40 m, the tape will be attached to the fixed post. Problems arise in that the tape sticks to the circumferential surface of the rotating drum, and the coefficient of friction between the tape and the fixed post or the circumferential surface of the rotating drum increases, resulting in uneven tape running speed and, as a result, the reproduced image deteriorates. Such problems become particularly noticeable when the device is used in a humid atmosphere. This kind of problem in a humid atmosphere is also disclosed in Japanese Patent Laid-Open No. 58-98868 as a general problem of VTRs, and a tentative solution is also presented. This is applied to the surface of the tape running member as a higher fatty acid such as stearic acid, as a higher fatty acid salt such as zinc stearate, as a higher fatty acid amide such as stearic acid amide, as a reactive organic amide such as a silane cobbling agent, or as a reactive organic titanium salt. For example, the above-mentioned member is crushed in a treatment solution in which a substance such as a precipitated titanate ester is dissolved in a solvent and the concentration is adjusted to about 1% by weight, and then the above-mentioned substance is applied to the surface of the above-mentioned member by drying with high-speed hot air. A thin film layer is formed to make the member water repellent.

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

〔the purpose〕

It is an object of the present invention to solve the problem that even when using a magnetic tape that is difficult to run, such as a vapor-deposited tape, the coefficient of friction in the tape running system is small, and the tape running speed becomes uneven and the tape runs smoothly. The tape does not stick to other components, has little damage to the tape, and has good tape running characteristics as described above even in a humid atmosphere. It is an object of the present invention to provide a magnetic recording/reproducing device in which damage to a tape running system can be suppressed even when a large magnetic tape is used.

〔overview〕

In order to achieve the above object, the present invention is characterized by the following configuration. That is, among the various materials constituting the magnetic tape running system, for example, the rotating drum. At least the magnetic tape sliding contact surface of a predetermined member such as a back tension post or a fixed post is coated with an il layer made of a noble metal element such as gold, platinum, rhodium, or an alloy thereof, on the base material of the predetermined member. It is characterized by being formed by

〔Example〕

Hereinafter, the present invention will be clarified by examples shown in the drawings.

FIG. 1 is a system diagram showing a tape running system of a VTR which is an embodiment of the present invention. In FIG. 1, the tape 10 emerges from the supply reel 12 in the cassette 11 and takes the following path.

Cassette inner post 13 → Cassette inner post 14 → Tension post 15 → Rotating roller 16 → Inclined post 17 → Rotating roller 18 → Tape leader 19 → Full width erasing head 20
→ Tape guide 21 → Drum 22 → Inclined post 23 → Audio erase head 24 → Audio control head 25 → Post 26 → Capstan 27 and pinch hole 28 → Cassette inner post 29 → Cassette inner post 3
o0 The tape 10 reaches the take-up reel 31 via the above-described route.

Among the members in the tape running system described above, for example, the tension post 15. Inclined post 17 and inclined post 23
is formed by coating the outer peripheral surface (tape sliding surface) of a base material made of stainless steel with a thin layer of noble metal elements such as gold, platinum, rhodium, or alloys thereof. Also drum 22
is formed by coating a thin layer of the above-mentioned noble metal element on the outer peripheral surface of a drum-shaped base material made of aluminum, similar to conventional devices of this type.

FIG. 2 is a sectional view showing a state in which the base material 41 is coated with a thin layer 42 of the noble metal element or the like.

As a means for forming the thin layer 42 described above, the base material 4
It is preferable to use a method of depositing the above-mentioned substance on the surface of 1 by physical vapor deposition (PVD).

FIG. 3(a) is a flowchart of the process of depositing gold by vacuum evaporation, which is one of the PVD methods.

First, in step 51, a sample, that is, a tension post 15. The inclined post 23 or the drum 22 is cleaned using an alkaline detergent, distilled water, and a solvent (acetone) in this order while performing ultrasonic cleaning. Next, in step 52, the sample is soaked in isopropyl alcohol. Next, in step 53, the sample is dried in freon vapor. Next, in step 54, the dried sample is placed in a Pelger vacuum evaporator. Next, in Step 55, while heating the sample set in the Pel jar to about 1000C, the inside of the Pel jar is back-pressured to a level of 10-' to 1Q'' T Or r using a rotary pump or a diffusion pump.Next, in Step 56 Sample humidity 100'
After setting the gold 61 as shown in Figure 3(b),
The electrode 6 is attached to the spiral type filament 62 containing the
3. Apply a current of about 64 to 7 A to melt gold 61.

At this time, the gap between the gold 61 and the sample is closed by a shutter, and the molten gold does not reach the sample. Next, in step 57, the state of step 56 described above is maintained for about 5 minutes to remove dirt and the like adhering to the surface of the gold 61. Then, in step 58, after opening the shutter, a current of about IOA is applied to the filament to melt the gold and form a film. Film formation at this time is performed at a slow GX speed of 1 μm/30 minutes.

In addition, when coating a noble metal element such as platinum, it can be coated in the same process as above. For example, in the case of an alloy of gold and platinum, the process is the same as above except that the current flowing through the filament in step 58 is 14 A.

In the device of the present invention configured as described above, the conventional 5US3
Instead of tension posts or inclined posts, which are made entirely of stainless steel such as 03, we use posts with a thin layer of precious metal elements, such as those mentioned above, formed on the outer surface of a base material such as stainless steel. Therefore, even if the wrapping angle of the tape around these posts is large, the coefficient of friction around the posts is small, and there is no +*ustii (tJ) of both the post and the tape. Inclined post 17.23 of the invention
The sum of the tape wrapping angles for
00, the sm resistance during tape running on the post circumferential surface or the static friction force between the post circumferential surface and the tape surface becomes extremely large, resulting in uneven tape running speed, significant wear of both the post and tape, etc. However, these problems have been eliminated by the present invention. Furthermore, in the embodiment of the present invention shown in FIG. 1, the rotating drum is constructed by coating a base material made of aluminum or plastic with, for example, a noble metal element. The same problem as with the posts mentioned above, which arises with respect to friction between the contact surface and the tape surface, is completely resolved.

FIG. 4 is a system diagram showing a measurement system for measuring the coefficient of friction in the tape running system of the apparatus of the present invention.

In FIG. 4, a magnetic tape 100 is connected to a supply reel 10.
1 → Fixed post 102 → Guide roller 103 → Fixed post 104 → Sample (drum or post) 200 → Tension analyzer post 106 → Fixed post 107 → Capstan 108 and pinch roller 109 → Guide roller 110 → Fixed post 111 → Take-up reel They are strung out in the order of 112. Tension analyzers 121 and 122 each having a tension gauge are connected to the tension analyzer posts 105 and 106, respectively.
Signal conversion circuits 131 and 132 are connected to each of them. The outputs of each signal conversion circuit 131 and 132 are input to an arithmetic circuit 140. The tension analyzer posts 105 and 106 are configured so that the distance between them can be changed to be wider or narrower.
This allows the tape 100 to be wrapped around the sample 200 at different angles. II! of sample 200 using the measurement system shown in FIG. 1! To measure the coefficient μ,
This capstan 1 is rotated by driving the capstan 108.
08 and the tape 10 sandwiched between pinch rollers 109
0 is run at a predetermined angle, the tension analyzer 121 detects the tension T1 of the tape facing the sample 200, and the tension analyzer 122 detects the tension T2 of the tape moving away from the sample 200.

Then, signal conversion circuits 131, 132 and arithmetic circuit 1
40, the calculation of u-I n (T2/T1)/θ (θ is the angle of tape winding) is performed to find the value of the friction coefficient μ. When measuring the friction coefficient μ under conditions of predetermined temperature and humidity, the measurement system shown in FIG. 4 is placed in a constant temperature and humidity bath.

When the value of the friction coefficient .mu. of the tape running system of the present apparatus was measured using the above measurement system, it was found that the friction coefficient .mu. was extremely small, on the order of 0.2 to 0.3.

〔Effect of the invention〕

According to the present invention, even when a type of tape that is thin and easily sticks to the tape running system, such as a vapor-deposited tape, is applied, sticking does not occur, the friction coefficient of the tape running system is small, and good running characteristics are ensured. be done. In addition, regardless of the type of tape used, there is little friction in the tape running system, so
There is little wear on the tape, and there is also very little wear on the tape running system itself. Further, even in a humid atmosphere, the tape does not stick, and the tape running system maintains an ideal state with a small coefficient of friction. Furthermore, since the thin layer is formed using noble metal elements such as gold, platinum, and rhodium, or alloys thereof, it also has the effect of being highly corrosion resistant.

[Brief explanation of drawings]

Figures 1 to 4 are diagrams showing an embodiment of the present invention. Figure 1 is a system diagram showing a tape running system, Figure 2 is a system diagram, and Figure 4 is a system diagram showing a system for measuring the coefficient of friction in a tape running system. FIG. 10.100...magnetic tape, 13.14.29°3
0... Post in cassette, 15... Tension post, 17.23... Inclined post, 22... Drum,
26... Post, 41... Base material, 42... Thin layer,
105゜106...Tension analyzer post, 1
21゜122...Tension analyzer, 131,1
32... Signal conversion circuit, 140... Arithmetic circuit, 20
0...Sample. Applicant's representative Patent attorney Jun Tsuboi Figure 1 Figure 2 Figure 3 (a) (b) Figure 4 01

Claims (6)

[Claims] (1) In a magnetic recording and reproducing device having a magnetic tape running system extending from the tape supply side to the tape winding side, at least the magnetic tape sliding surface of a predetermined member of each member constituting the magnetic tape running system is made of gold, 1. A magnetic recording/reproducing device characterized in that the base material of the predetermined member is coated with a thin layer made of a noble metal thread such as platinum or rhodium or an alloy thereof. (2) The magnetic recording and reproducing apparatus according to claim (1), wherein the predetermined member is a drum on which the magnetic tape is wound and run over a predetermined angle. (3) The magnetic recording and reproducing apparatus according to claim (2), wherein the drum is a rotating drum made of aluminum or plastic. (4) The predetermined member is a pack tension post. The fixed post or both claims (
1) The magnetic recording and reproducing device described in item 1). (5) The magnetic recording and reproducing apparatus according to claim (4), wherein at least one of the pack tension post and the fixed post is made of stainless steel and has a cylindrical shape. (6) The magnetic recording/reproducing device according to any one of claims (1) to (5), wherein the thin layer is formed by coating the base material by a physical vapor deposition method.