JPS60219661A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To obtain an excellent tape running characteristic even under very humid atmosphere with less tape damage by forming a prescribed member being a component of a magnetic tape running system with a titanium oxide ceramics. CONSTITUTION:A drum 22, a tension post 15 and two tilt posts 17, 23 are formed by the titanium oxide ceramics being a sintered body using a rutile (TiO2) as a major component among components in the tape running system. That is, the components formed by the titanium oxide ceramics are used in place of the drum, the tension post or the tilt posts made of a stainless steel such as SUS 303 in conventional device. Thus, even if the winding angle of the tape onto the members is large, the friction coefficient around the members is less and both the components and the tape have very less wear.

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), etc. [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, what is the current VTR system?

VH8 method, β method, V-2000 method or CvC
Various incompatible methods, such as force equations, coexist and are widespread. This has led to inconvenient problems such as confusion on the user's side. With regard to the so-called 8-frame VTR, which is being developed as a next-generation model against the above-mentioned background, manufacturers have attempted to completely unify the standards. The magnetic tape used in this 8-inch VTR is a metal tape or a vapor-deposited tape. Among these, when applying metal tape, is it a magnetic tape (hereinafter simply referred to as tape) running system? If the configuration is similar to that used 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, as in the past, for example, a fixed post made of stainless steel or a rotating drum made of aluminum? The tape was wound around a rotating drum with a φ=40 fin at an angle of 210°. When a T system is configured, the tape may stick to the surface of the fixed post or rotating drum, or the coefficient of friction between the tape and the surface of the fixed post or rotating drum increases, causing uneven tape running speed, and as a result, the reproduced image may Problems such as deterioration occur. Is there such a problem with equipment in a humid atmosphere? It is especially destructive when used. This kind of problem in a humid atmosphere is also disclosed in Japanese Patent Application 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 system member as a higher fatty acid, such as stearin powder, as a higher fatty acid salt, such as zinc sulfate-7 phosphate, as a higher fatty acid amide, such as sulfate-7 phosphate amide, and as a reactive organic amide, such as sulfate-7 phosphate. By dissolving a substance such as an organic titanate ester as a ring agent and reactive organic titanium in a solvent and adjusting the concentration to about 1% by weight, the above-mentioned member is immersed in a treatment solution, and then dried with high-speed hot air. A thin film layer made of the above substance is formed on the surface of the member 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〕

The purpose of the present invention is to provide a low coefficient of friction during 7-pipe running even when using a calm tape, which is difficult to run, such as a vapor-deposited tape, and to prevent irregularities in tape running speed. The tape does not stick to the running system members, there is little damage to the tape, and the tape runs as well as described above even in a humid atmosphere. 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 magnetic tape that has a large abrasion effect is used.

〔overview〕

In order to achieve the above object, the present invention is characterized by the following structure. That is, among the members constituting the air travel system, certain members such as the rotating drum, the back tension post, or the fixed post,
The f/% characteristic is that it is formed from titanium oxide ceramics.

〔Example〕

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

FIG. 1 is a system diagram showing a tape running thread of a VTR which is an embodiment of the present invention. In FIG. 1, tape 10 exits from supply reel 12 in cassette ll and follows the following path?
Take.

Cassette inner post 13 → Cassette inner post 14 → Dension post 15 → Rotating p-ra 16 → Inclined post 17 → Rotating roller 18 → Tape leader 19 → Full width erasing head 20
→ tape guide 21 → drum 22 → diagonal post 23 → audio erase head 24 → audio control head 25 → post 26 → capstan 27 and pinch ruler 28 → cassette inner post 29 → cassette inner post 3
The 0° tape lO reaches the take-up reel 31 via the above-described route.

Among the members in the tape running system described above, the drum 22
．． Tension post 15. Two inclined posts 17.23
is made of titanium oxide ceramic, which is a sintered body mainly composed of rutile (Ti02).

FIGS. 2(a) and 2(b) are a plan view and a side view of the drum 22 made of the titanium oxide ceramic.

The drum 22 includes an upper drum (rotating drum in this embodiment) 41 and a lower drum (fixed drum in this embodiment) 4
It is composed of 2. A shaft 43 is fixed to the upper drum 41, and the upper drum 41 is fixed to the shaft 43.
the bifurcated upper drum 4 adapted to rotate together with the bifurcated upper drum 4;
1 is provided with a pair of magnetic heads 44 and 45 at 180° different positions as shown in the figure.
Although 4.45 is 2 heads in this embodiment, it may be 4 heads. A tape guide 46 is provided on the lower drum 42, and a magnetic deheve (not shown) runs along this tape guide 46.

FIG. 3 is a flowchart of the manufacturing process fI-yr- of titanium oxide ceramics for forming the drum and the like.

First, in step 51, raw materials are prepared, put into a slurry, and ground and mixed to form a slurry to adjust the particle size.

Next, in step 52, is the raw material turned into a slurry? Make it into a spray state, instantly evaporate the water and dry it. In step 53, the arrow is extruded from a predetermined die using the above-mentioned raw material imparted with plasticity. Dry and cut the extruded material in steps 54 and 55 into arrows. Next, in step 56, the cut member is fired in an electric furnace, gas furnace, controlled atmosphere furnace, vacuum furnace, etc. depending on the material.

Then, in step 57, the fired member is ground and
Machined to a highly accurate surface condition using ratpinder processing. After that, in step 58, check f:@-do, step 5
It will be commercialized in September.

Note that the manufacturing process is not limited to the example described above. For example, instead of the extrusion molding shown as steps 53, 54, and 55, injection molding may be performed in step 5, shown as step 60.

That is, thermoplastic plastic may be mixed with raw materials and pressure molded into Venus while being heated. Further, pressure forming may be performed as shown in Step 61, or bisque firing and cutting may be performed as shown in Steps 62 and 63 after pressure forming.

That is, the raw material may be pressure-molded using a mechanical press or a rubber press, or may be further biscuited and then cut into a desired shape.

Furthermore, as shown in steps 64, 65, and 66, drying and #I molding may be performed after casting.

That is, the raw material that has become slurry in step 51 may be directly poured into a mold to be molded, and then dried and released from the mold. Furthermore, as shown in step 67, hot pressing, that is, molding and firing are performed simultaneously.
You can strain it by 1 strain.

In the device of the present invention configured as described above, the conventional 5U83
Instead of the drum, tension post, or inclined post, etc., which were made entirely of stainless steel such as 03,
Since members made of titanium oxide ceramics are used, even if the angle at which the tape is wrapped around these members is large, the coefficient of friction around the members is small, and wear on both the members and the tape is extremely low. For example, when winding the tape around the drum 22, the corners are 21
It becomes 0°8 degrees. Therefore, with conventional tape running speeds, the frictional resistance during tape running on the surface of the drum or the static friction between the drum circumferential surface and the tape surface is extremely large, resulting in uneven tape running speed, and significant wear of the drum and tape double blade. However, these problems have been eliminated by the present invention. Also, for example, the inclined post i7. The sum of the tape wrapping angles with respect to za is about 100°,
This occurs due to the friction between the post circumferential surface and the tape surface.
Problems similar to those mentioned above are completely resolved.

FIG. 4 is a system diagram showing the needle side system A for measuring the coefficient of friction in the deep running system of the device 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 → density analyzer post 105 → sample (
The drum or post) 200 → tension analyzer post 106 → fixed post 107 → capstan 108 and pinch ruler 109 → guide roller 110 → fixed post 111 → take-up reel 1120. The above Dension Analyzer Posts, 105 and 106 respectively correspond to Dennyong Guji? Tension analyzers 121 and 122 are connected to each other, and 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. The distance between each of the diffusion analyzer posts 105 and 106 can be changed to be wider or narrower.
The corner of the tape 100 wrapped around the tape 00 can be changed. Sample 200 was measured using the measurement system shown in Figure 4.
The trap for measuring the friction coefficient μ of
100 tapes held by the sample 200 are run at a predetermined angle, and the tension T1?1 of the tape on the side facing the sample 200 is detected by the tension analyzer 121, and the tension T2G- of the tape on the side moving away from the sample 200 is detected. It is detected by the tension analyzer 122. And signal conversion circuit 1
31, 132 and the arithmetic circuit 140', the following calculation is performed: p=In (T2/Tl)/θ (θ is the angle of tape winding) to calculate 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 installed in a constant temperature and constant humidity mVC.

When the friction coefficient .mu. of the tape running system of the present apparatus was determined 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.

Although ceramics generally have the disadvantage that they are easier to process than metals, they have advantages such as superior heat resistance and chemical resistance, and a small coefficient of thermal expansion. Furthermore, in terms of processing accuracy, according to current technology, it is possible to achieve processing accuracy comparable to that of ordinary metals, and surface roughness can be reduced to 0.3 μRz or less by polishing. In particular, the titanium oxide ceramic used in this example has excellent surface smoothness among ceramics, and has little friction. Furthermore, since the surface of titanium oxide ceramics is electrically conductive, it has the advantage that static electricity generated from friction caused by running the tape can be easily removed. It also has superior wear resistance compared to metals such as aluminum used in general drums, and no surface deterioration is observed. Therefore, no damage is caused to the magnetic tape itself.

[The young fruits of invention]

According to the present invention, even when a tape such as a vapor-deposited tape is used, which is thin and has a tendency to stick, sticking does not occur, the friction coefficient of the tape running system is small, and good running characteristics are achieved. is ensured. 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 sticky tape phenomenon does not occur, and the tape running system maintains an ideal state with a small coefficient of friction.

[Brief explanation of the drawing]

FIG. 1 is a system diagram showing a tape running system according to an embodiment of the present invention, FIGS. 2(a) and (b) are a plan view and a side view of a drum according to the same embodiment, and FIG. 3 is a diagram showing a tape running system according to an embodiment of the present invention. FIG. 4 is a flow chart showing the manufacturing process of titanium oxide ceramics, and 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 same embodiment. 10.100...magnetic tape, 13,14.29°3
0... Post in cassette, 15... Tension post, 17.23... Inclined post %22... Drum,
26... Post, 105, 106... Tension analyzer post, 121, 122... Tension analyzer, 131, 132... Signal conversion circuit, 140...
Axis Enshin Circuit, 200...sample. patent applicant

Claims (1)

[Scope of Claims] +1) In a magnetic recording/reproducing device having a magnetic tape running system extending from a tape supply side to a tape winding side, a predetermined member of each member constituting the magnetic tape running system is made of titanium oxide ceramics. A magnetic recording/reproducing device characterized in that the magnetic recording/reproducing device is formed by: (2) The magnetic recording and reproducing apparatus according to claim (1), wherein the predetermined member marked with # is a drum on which the magnetic tape is wound and run over a corner in a predetermined manner. (3) The predetermined member is a back tension post. Claim number + which is a fixed post or both
1) The magnetic recording and reproducing device described in item 1).