JPS60138761A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To prevent damage to be inflicted on a running system even if a tape which wears the tape running system is used by coating a thin layer of a silicon compound onto a magnetic tape contact face of prescribed members in each member constituting the tape running system. CONSTITUTION:The thin layer of a silicon compound is coated to an outer circumference face of a base made of stainless steel in each member of the tape running system such as a tension post 15 and tilted posts 17 and 23 or the like. The thin layer of the silicon compound is coated to the outer circumference face of the base of a drum form made of a conventional Al in a drum 22. Even if a tape of a kind liable to be sticked to the tape running system such as a thin vapor-deposition tape is used, no sticking takes place, the friction coefficient of the tape running system is small and the excellent running characteristic is ensured. Moreover, no tape sticking takes place in a humid atmosphere.

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 VHS 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 the background described above, the so-called 8# VTR is being developed as a next-generation model.
Regarding this, complete standardization has been achieved among manufacturers. The magnetic tape applied to this 8 rra VTR is a metal tape or a vapor deposited tape. When metal tape is used, if the magnetic tape (hereinafter simply referred to as tape) running system is constructed in the same way as that used in conventional VTRs, metal tape will cause significant wear and tear on various parts of the tape running system. Become.

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 way as in the past, using a fixed post made of stainless steel or a rotating drum made of aluminum, and setting the tape winding angle to the rotating drum of φ-40 mm to 2109 degrees, 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 coupling agent, or as a reactive organic amide. As titanium, for example, a substance such as a visible titanate ester is dissolved in a solvent, and the above-mentioned member is crushed in a treatment liquid whose concentration is adjusted to about 1% by weight.The above-mentioned material is then applied to the surface of the above-mentioned member by drying with high-speed hot air. A thin film layer made of a substance is formed to make the above-mentioned 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. It does not stick to other components, causes less damage to the tape, provides good tape running characteristics as mentioned above even in humid atmosphere, and has the ability to wear out the tape running system like metal tape. An object of the present invention is to provide a magnetic recording/reproducing device in which damage to a tape running system can be suppressed even when a magnetic tape having a large diameter is used.

〔overview〕

In order to achieve the above object, the present invention is characterized by the following configuration. That is, among the members constituting the magnetic tape running system, at least the sliding contact surface of the magnetic tape of a predetermined member such as a rotating drum, a back tension post, or a fixed post is coated with a thin layer made of a silicon compound. It is characterized in that it is formed by coating the base material.

〔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, tape 10 exits from supply reel 12 in cassette 11 and takes the following path.

Cassette inner post 13 → Cassette inner post 14 → Tension post 15 → Rotating roller 16 → Inclined boss 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 roller 28 → Inner cassette post 29 → Inner cassette post 3
The 0° 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 a thin layer of a silicon compound (Si3N+SiO2, SiC, etc.) on the outer peripheral surface (tape sliding surface) of a base material made of stainless steel. The drum 22 is formed by coating the outer peripheral surface of a drum-shaped base material made of aluminum with a thin layer of the silicon compound described above, similar to the conventional apparatus of this type.

FIG. 2 is a sectional view showing the base material 41 coated with a thin layer 42 of a silicon compound.

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) or chemical vapor deposition (CVD).

,■ Figure 3 shows that among the silicon compounds, S +z N4 is PV
It is a figure which shows the flowchart of the process of depositing by RF magnetron sputtering which is the first part of method D.

First, in step 51, the sample, that is, the tension post 15. The inclined post 23 or the drum 22 is cleaned using an alkaline detergent, distilled water, and an organic solution tS<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 sputtering apparatus chamber. Next, in step 55, while heating the sample set in the chamber, a cryopump backpressures the inside of the chamber to about 11 OTorr. Next, in step 56, the sample is set at about 100'C, and then Ar gas is flowed into the chamber at about 10 mTorr as a sputtering gas. The target used in this case is a 4-inch target made of a 5iaN4 sintered body. Then, in step 57, pre-sputtering is performed once with a sputtering power of 200W from a high frequency power source of 13', 56Ml-1z.
After a certain period of time, sputter film deposition is performed.

Furthermore, in order to deposit SiO2 as a silicon compound by RF magnetron sputtering, a 4-inch size 5iQ2 target is used, and Ar gas is
into the mTorr chamber. Other processes are 5iaN
The same is true for +.

Further, when depositing SiC as a silicon compound by RF magnetron sputtering, a 4-inch size SIC is used as a target. Others are Si
The same is true for O2.

In the device of the present invention configured as described above, the conventional 5US3
Instead of tension posts or inclined posts made entirely of stainless steel such as 03, a post with a thin layer of silicon compound as described above, for example, formed on the outer surface of a base material such as stainless steel, is used. Therefore, even if the wrapping angle of the tape around these posts is large, the coefficient of friction around the posts is small, and wear on both the posts and tape is extremely reduced. In conventional devices of this kind, the sum of the tape wrapping angles for both inclined posts (corresponding to the inclined posts 17 and 23 of the present invention) is about 1000, and the frictional resistance when the tape runs on the circumferential surface of these posts is Alternatively, the static friction between the post circumferential surface and the tape surface may become extremely large, causing uneven tape running speed or causing the post,
Problems such as significant wear of both tapes had occurred, but these problems have been eliminated by the present invention. Furthermore, in the practical example of the present invention shown in FIG. 1, the rotating drum is constructed by coating a silicon compound on a base material made of aluminum or plastic. The same problem with the posts mentioned above, which arises with respect to friction between the tape 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, the magnetic tape 100 is
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 distance between the tension analyzer posts 105 and 106 can be changed to be wider or narrower, so that the angle at which the tape 100 is wrapped around the sample 200 can be changed. To measure the friction coefficient μ of the sample 200 using the measuring system shown in FIG. A tension analyzer 121 detects the tension T1 of the tape on the side facing the sample 200, and a tension analyzer 122 detects the tension T2 of the tape on the side moving away from the sample 200.

Then, signal conversion circuits 131, 132 and arithmetic circuit 1
40, calculate the value of the friction coefficient μ by performing the calculation u = I n (T2/T1 >/θ (θ is the angle of tape winding). Measure the friction coefficient μ under the specified temperature and humidity conditions. If this is the case, the measurement system shown in Figure 4 should be 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.

(Effects of the Invention) According to the present invention, even when a type of tape such as a vapor-deposited tape that is thin and tends to stick to the tape running system is applied, sticking does not occur, and the friction coefficient of the tape running system is small, making it suitable for use. In addition, regardless of the type of tape used, the friction in the tape running system is low, 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 ideal state in which the *m coefficient of the tape running system is small is maintained. Furthermore, since the thin layer is formed using a silicon compound, the material cost is low and it can be easily produced by applying conventional technology.

Furthermore, since it is a wireless compound, it also has the effect of being highly film resistant.

[Brief explanation of the drawing]

Figures 1 to 4 are diagrams showing one embodiment of the present invention, with Figure 1 being a system diagram showing the tape running system, and Figure 2 being a sectional view showing a state in which the base material is coated with a thin layer. , FIG. 3 is a flowchart of the process of coating with a silicon compound, and FIG. 4 is a system diagram showing a system for measuring the coefficient of friction in a tape running system. 10.100--Magnetic tape, 13.14.29゜3
0...Cassette 1-inner post, 15...Tension post, 17.23...Slanted post, 22...Drum, 26...Post, 41...Base material, 42...Thin Layer, 105°106...Tension analyzer post,
121゜122...Tension analyzer, 13L
132... Signal conversion circuit, 140... Arithmetic circuit, 2
00...Sample. Applicant's agent Patent attorney Atsushi Tsuboi Figure 1 Figure 2

Claims (7)

[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 contact surface of a predetermined member of each member constituting the magnetic tape running system is made of a silicon compound. A magnetic recording/reproducing device characterized in that the base material of the predetermined member is coated with a thin layer of the following. (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 back 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. (7) 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 chemical vapor deposition method.