JPS60145549A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To obtain a good running characteristic with a small coefft. of friction and to reduce tape damage by coating a thin layer consisting of a prescribed material on the prescribed members among constituting members of a traveling system for a magnetic tape to be brought into sliding contact with the magnetic tape. CONSTITUTION:A thin layer of one among carbide, nitride and carbonitride of III, IV, IVa, Va, VIa group elements, for example, TiN is coated on the outside circumferential surface (the surface in sliding contact with a tape) of a base material made of a stainless steel for, for example, a tension post 15, inclined posts 17, 23 of a tape traveling system. A thin layer of TiN is coated on the outside circumferential surface of a drum 22 made of an aluminum alloy. If a PVD method or the like is used to form these thin layers, the Vickers hardness of the thin TiN layer is made >=2000 and the coefft. of friction with a magnetic tape is decreased. The good running characteristic is obtd. without uneven tape traveling speed and with decreased damage on the tape.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to an example of a magnetic recording/reproducing device used in a video tape recorder (hereinafter abbreviated as VTR) or 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. Under these circumstances, VTR systems currently include various incompatible systems, such as the VF (S system, β system, V-20007J Alt, and '1iCVC system). This has led to inconvenient problems such as confusion on the user side.With regard to the so-called 8 mm VTRK, which is being developed as a next-generation model against the above-mentioned background, manufacturers Complete standardization has been achieved among the companies.The magnetic tapes applied to these 8VTRs are metal tapes or vapor-deposited tapes.When metal tapes are used, magnetic tape running systems ( If the tape running system (hereinafter simply referred to as the tape running system) is constructed in the same manner as that employed in various conventional VTRs, the metal tape will cause significant wear on various parts of the tape running system.

Furthermore, when a vapor-deposited tape having 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 fixed posts made of stainless steel and rotating drums made of aluminum alloy, and setting the tape winding around the rotating drums with diameters of 40 degrees at an angle of -210 degrees, the tape problems such as sticking to the surface of the fixed post or rotating drum, increasing the coefficient of friction between the tape and the surface of the fixed post or rotating drum, causing uneven tape running speed, and as a result, deteriorating the reproduced image. happen. Such problems become particularly noticeable when the apparatus is used in an atmosphere with low humidity. This type of problem in a humid atmosphere is also disclosed in Japanese Patent Application Laid-Open No. 58-98868 as a general problem with VTRs.
A tentative solution is also presented. This can be applied to the surface of the tape-based member as a higher fatty acid, such as stearic acid, as a higher fatty acid salt, such as zinc stearate, as a ^-class fatty acid amide, such as stearic acid amide, or as a reactive a7 amide, such as a silano coupling agent. After the above-mentioned member is immersed in a treatment solution prepared by dissolving a substance such as an organic titanate ester as organic titanium in a solvent and adjusting the temperature to about 1 layer per degree, the above-mentioned member is dried using high-speed hot air. A thin film layer made of the above-mentioned substance is formed on the surface of the material, so that the member mentioned above has water repellency. However, the thin film layer produced by the method disclosed above cannot withstand wear caused by a tape running button for a long period of time (it is not practical).

〔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 parts, causes less damage to the tape, and has good tape running characteristics as described above even in humid environments, and does not wear out when running the tape like metal tape. It is an object of the present invention to provide a magnetic recording and reproducing device in which damage to a tape running system can be suppressed even when a highly effective magnetic tape is used.

〔overview〕

In order to achieve the above object, the present invention is characterized in that it is configured as follows.That is, among the various parts constituting the magnetic tape running system, a predetermined part such as a rotating drum, a bank teno/yono post, or a fixed post is used. Fewer parts (also known as magnetic Dave sliding contact surface, old group of the periodic table, Iv
What is the example of forming the thin layer of carbide, nitride, or carbonitride of a group element, (i) group, a group, Va group, or Via group element by coating it on the mother H in which part? It is a feature.

〔Example〕

The present invention will be clarified by describing embodiments of the present invention in detail below using the drawings.

FIG. 1 is a system diagram showing a tape running system in an embodiment of the present invention. In FIG. 1, the gauge 10 is a cassette l.
It exits from the supply reel 12 in l and takes the following route.

Cassette inner post 13→Cassette inner post 14→Den Yonobosuto 15→Rotating roller 16→Slanted post 17→Rotating roller 18→Tape leader 19→Full width erasing head 20
→ Deep Kaid 21 → Drum 22 → Il: [l Diagonal boss 23 → Audio erase head 24 → Audio control head 25 → Post 26 → Capstan 27 → Pitch roller 28 → Inner cassette boss 29 → Inner cassette boss 30. .

For example, the tape IO reaches the take-up reel 31 via the above-described route.

In this embodiment, among the members in the tape running system described above, for example, the density/post 15. The inclined post 17 and the inclined post 23 have carbides or nitrides of elements of group I, group II, lVa, Va, or Vla of the periodic table on the outer peripheral surface (tape sliding surface) of the stainless steel matrix. or titanium nitride (T'iN) as a substance that falls under any of the carbonitrides.
) is coated with a thin layer of Also drum 22
It is formed by coating the outer circumferential surface of a drum-shaped matrix made of aluminum alloy with a thin layer of the above-mentioned titano, similar to the conventional device of this type. To form these thin layers, it is preferable to apply a method in which the above-mentioned substance is coated on the surface of the base material by a physical vapor deposition method (PVD method) or a chemical vapor deposition method (CVD method). According to experiments conducted by the inventors, it has been confirmed that the 1-year-old TiN117 layer formed by applying the PVD method has a Vickers hardness (Hv') of about 2000 or more.

In the device of the present invention having the above-mentioned configuration, the conventional 5US30
Instead of the Tenosho 7 boss or inclined post, etc., which were made entirely of Sderus field such as 3, Sderusli
Since we use posts with a thin layer of TiN as described above formed on the outer surface of the matrix such as i'A, even if the wrapping angle of the tape around these posts is large, the coefficient of friction at the surface of the post will be low. In conventional devices of this type, the sum of the tape wrapping angles for both inclined posts (corresponding to the inclined post 17 and 23 of the present invention 1-2) is approximately 100. degree, and the frictional resistance on the circumferential surface of these posts when the tape runs or the static frictional force between the post family ff1i and the tape surface becomes extremely large, causing uneven tape running speed and significant wear on both the post and tape. However, these problems have been eliminated by the present invention.Furthermore, in the embodiment of the present invention shown in Figure 1, the 5-rotation drum is also coated with TiN on the aluminum alloy base material. Since it is applied to a drum, the same problems as those related to the above-mentioned post, which occur regarding friction between the drum outer peripheral surface (tape sliding surface) and the tape surface, can be solved completely.

In addition, as a modification of the embodiment of the present invention described above, the fixing post such as the Tejong boss or the 1st diagonal host may be made of light alloy (
ffJ: u of aluminum alloy, magnesium alloy, etc.
Upper Nilf, tV, lVa, va or Vl
Carbides and oxides of group a elements (e.g. TiN) and +1
It may also be constructed by coating a thin layer of carbonitride. Of course, the same effects as described above can be obtained in this case as well.

FIG. 2 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. 2, one magnetic tape 100 includes a supply reel 10
1 → Fixed post 102 → Guide p-ra 103 → Fixed post 104 → Ten 7 Yon Anara/F The Post 105 → Sample (drum or post) 200 → Tennyo/Analyzer Post 106 → Fixed Post 107 → Cap Stand 108
They are stretched in the order of pitch ruler 109 → kite p-ruler 110 → fixed boss 111 → width reel 112. Tension analyzers 121 and 122 each having a tension gauge are connected to the tension/analyzer posts 105 and 106Vc, respectively.
Signal conversion circuits 131 and 132 are connected to these tension analyzers 121 and 122, respectively. The output of each signal conversion circuit 131, 132 is input to an arithmetic circuit 140. Each of the denotation analyzer posts 105 and 106 is shaped so that the distance between them can be changed wider or narrower, so that the angle of the wrapping of the dog tube 100 around the sample 200 can be changed. . Sample 2 was measured using the measurement system shown in Figure 2.
To measure the M friction coefficient 11 of 00.

This capstan 1 is rotated by capstan 108.
08 and the tape 10 held by the pitch roller 109
0 traveling at a constant angle of Pli toward the sample 200.
l [l tape tension Tl & tension analyzer 12
1 trap, and the tension T2r of the tape on the side moving away from the sample 200 is detected by the tension analyzer 122. Then, through the signal conversion circuits 131, 132 and the calculation circuit 140, the calculation p = I n (T 2 / T 1 n / θ (θ is the angle of tape winding) is performed to calculate the value of the friction coefficient μ. When measuring the friction coefficient μ under conditions of humidity and humidity, the measurement system shown in FIG. 2 is placed in a constant temperature and humidity chamber.

Figures 3(a), (b) and @4(a).

(b) shows the results of measuring the J4f friction coefficient μ of the sample drum surface using the measurement system shown in FIG. 2 and recording it on a recorder. In each figure, the horizontal axis is the time axis, and a'(+11+) corresponds to the coefficient of friction μ.The measurement conditions and approximate nail values in each figure are summarized in the table below. However, in each of the above measurements, the thickness of the magnetic tape was approximately 1
A vapor deposition tape (Co Ni vaporized on a base) with a thickness of 0 μm and a width of 8 mm was applied.

(bkI = Dohaku) [Effect of the invention J According to the present invention, even when a type of tape that easily sticks to the tape running system such as a vapor-deposited tape is applied, stickiness does not occur and the tape running system remains unchanged. The coefficient of friction is small, and good running stability is maintained. 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. This does not occur, and the ideal state in which the coefficient of friction of the tape running system is small is maintained.

[Brief explanation of the drawing]

Fig. 1 is a system diagram showing a tape running system according to an embodiment of the present invention, and Fig. 2 is a system diagram showing a 4-1 measurement system for measuring the coefficient of friction in the tape running system of the apparatus of the present invention. 3 (IL), (, b) and FIG. 4 (a), (b) are diagrams showing the results of friction coefficients measured by the measurement system of FIG. 2 and recorded on an encoder, respectively. 10.100...Magnetic tape-13, 14, 29°3
0...Post in cassette, 15-...Tension post, 17.23...Slanted post, 22...Drum-2
6... Post, 105, 106... Tension analyzer post, 121, 122... Door tension analyzer, 131.132... Signal conversion circuit, 140...
Arithmetic circuit, 200...sample. 1171 2.1S2 L・j OI Figure 3 (Q) (b)

Claims (1)

Scope of Claims: (1) In a magnetic recording and reproducing apparatus having a magnetic tape running system extending from the deso supply side to the tape winding side, at least one of the predetermined members of the magnetic tape running system constitutes the magnetic tape running system. The tangential surface. A thin layer formed by coating the base material of the predetermined member with a carbide, nitride or carbonitride of an element of group I, group Ⅰ, group IVa, group ∆a or ∆a of the periodic table. A magnetic recording/reproducing device characterized by: (2) The magnetic recording and reproducing device according to claim (1), wherein the predetermined member is a drum on which the magnetic recording material is wound and run over a corner in a predetermined manner. (3) The drum is made of aluminum. The magnetic recording/reproducing device according to item (2) of the claim, which is a rotating drum made of an alloy as a base material. Claim No. (
1) The magnetic recording and reproducing device described in item 1). (5) The magnetic recording/reproducing device according to claim (4), wherein the base material of at least one of the back/yono post and the fixed post is made of stainless steel and has a cylindrical shape. (6) The magnetic recording and reproducing device according to claim (4) ML, wherein the base material of at least one of the tension post and the fixed post is made of light metal and has a cylindrical shape. (7) The magnetic recording/reproducing device according to any one of claims (1) to (6), wherein the thin layer is made of titanium nitride. (8) Claim No. 1, which is formed by coating the base material with a thin layer of Ail by physical vapor deposition.
) to (7). (9) The magnetic recording and reproducing device according to any one of claims (1) to (7), wherein the thin layer is formed by coating the base material by a chemical deposition method. .