JPS58111131A - Production of magnetic tape - Google Patents

Abstract

PURPOSE:To improve the smoothness of the surface of a magnetic tape by setting up a press roller around which a tape coated with fine grain abrasives is wound to the magnetic tape travelling between reels to finish by grinding while travelling the tape. CONSTITUTION:The magnetic tape 2 is travelled from a supply reel 21 to a take-up reel 24 through rollers 22, 23 and a grinding tape 25 which is set up throgh a roller 26, a press roller 27 and a roller 28 with tension and obtained by adhering diamond powder or the like having about 1mum average grain size on its surface is pressed to the surface of the travelling magnetic tape 2 while making it travel at a speed several times or several ten times of the travelling speed of a magnetic tape to finish the surface of the magnetic film of the magnetic tape by grinding while travelling the magnetic tape.

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Technical field of the invention The present invention relates to a super large capacity storage device MSS
The present invention relates to a manufacturing method for finishing the magnetic film surface of a magnetic tape such as a magnetic tape such as a magnetic tape.

(2) Background of the technology In the ultra-large capacity storage device MSS, data cartridges made of coiled magnetic tape (usually 69 mm in width) are housed in a large number of honeycomb-shaped storage cells, and are automatically transferred in response to calls. This is a device that reads and writes signals via a magnetic tape, which is a storage medium, using a pull-out and oblique scanning method.

FIG. 1 is a perspective view of a data cartridge and storage cell. The storage cells I have a hexagonal shape and are composed of several hundred to several tens of cells. This storage cell 1 accommodates a data cartridge 3 containing a magnetic tape 2, and a data cartridge 3 containing a magnetic tape 2 is stored in the storage cell 1.
direction automatically.

FIG. 2 is a perspective view of a diagonal scanning rotary head, in which a magnetic tape 2 is wound around a mandrel 4 in a spiral shape, and the diagonal scanning rotary head 5 rotates at about 7000 revolutions per minute.
A large number of small holes 6a are arranged on one turning surface of the W roller 6, which performs reading and writing while scanning the magnetic tape 2 diagonally. ing. Furthermore, the read head 7 and the write head 8 slightly protrude from one rolling surface of the rotary wheel 6, forming a film of air flow on the magnetic tape 2, reducing the degree of contact with the medium and stabilizing it to less than 1 μm. Maintain a good gap and send and receive magnetic signals.

FIG. 3 is an enlarged perspective view of the head (in this example, the reading head is shown). The head portion 7 is composed of multiple layers of ferrite and ceramic, and a magnetic pole 10 is embedded approximately in the center of the central layer.

Two grooves 11 are provided above and below the magnetic poles, which serve as airflow passages. The distal end surface 12 of the magnetic head has a spherical shape and is polished to a mirror surface.

(3) Prior art and problems The MSS magnetic tape uses a diagonal scanning method and flies at a high speed of 33 meters per second.The gap between the magnetic head and the magnetic tape during running is as small as approximately 0.3 μm, so the magnetic tape is The small protrusions of the tape medium constantly collide with the magnetic head,
This causes wear and deterioration of the magnetic head.

FIG. 4 is a horizontal diagram showing the cross-sectional structure of the magnetic film of the magnetic tape. A conventional magnetic tape medium is one in which γ-Fe-OJ magnetic needle crystals are coated on a Mylar tape using an epoxy resin binder added thereto. A portion of this magnetic needle-like crystal protrudes, and the amount of protrusion e reaches 0.4 to 0.5 μm. This amount of protrusion is larger than the flying height of the magnetic tape mentioned above.Although the 1M magnetic tape is calendered to flatten the surface, it is difficult to completely remove the protrusions mentioned above. Therefore, in reality, the magnetic tape rubs against the surface of the magnetic head, causing wear and deterioration, and the magnetic head must be replaced after a certain period of time.

FIG. 5 shows an example of measurement data of the surface roughness of a magnetic tape. e on the graph corresponds to e in FIG.

(4) Purpose of the Invention The present invention provides an extremely small projection e of the magnetic tape (
0.1 μm or less).

(5) Structure of the Invention The present invention involves winding a tape with a fine abrasive adhered onto a pressure roller that presses a magnetic tape, and disposing the pressure roller between the magnetic tape's feed reel and take-up reel. ,
The above object is achieved by a magnetic tape manufacturing method characterized in that the surface of the magnetic film of the magnetic tape is finished by running polishing.

(6) Embodiment of the Invention FIG. 6 is a schematic perspective view of the main parts of a magnetic tape medium finishing apparatus according to the present invention. Magnetic tape 2 is feed reel 2
1 through rollers 22 and 23, a suitable back tension is applied to the take-up reel 24, power is obtained, and the film is wound in the direction of arrow C.

On the other hand, the abrasive tape 25 passes from the roller 26 to the pressure roller 27 and is installed under the force of a roller 28, so that it can run in both directions of the arrows AB with power. The polishing tape 25 is made by bonding diamond powder with an average particle size of 1 μm with a binder. The winding reel 24 is connected to a motor through a variable speed reducer, and an arbitrary running speed can be set. Similarly, abrasive tape 25
An appropriate polishing speed can be selected for roller 26.2B by a motor with a variable speed reducer, and rollers 26 and 28 can be switched by a clutch. The running speed of the polishing tape 25 is several times to several tens of times faster than the running speed of the magnetic tape, and this condition is selected and set depending on the respective material conditions.

FIG. 7 shows surface roughness data obtained by processing a magnetic tape medium using the magnetic tape manufacturing method according to the present invention.

The cross-sectional structure of the magnetic film is shown, and the needle crystal protrusions have been removed, and the finished roughness f has been changed to about 0.1 μm as expected. Note that a description of magnetic tape cleaning and the like will be omitted.

(7) Effects of the Invention According to the present invention, by improving the smoothness of the surface of the magnetic tape medium, the flying height above the magnetic head is constant in terms of characteristics.
Moreover, it becomes stable, improves the number of error bits in reading and writing, reduces wear on the magnetic head, and together with improving the material of the magnetic head itself, extends the lifespan and improves the operating rate of MSS. You can get results such as improvement.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of the data cartridge and storage cell;
Figure 2 is a perspective view of the oblique scanning rotary head, and Figure 3 is the head (
FIG. 4 is a horizontal view of the structure showing the cross-sectional structure of the magnetic film of the magnetic tape, and FIG.
The figure shows measurement data of the surface roughness of magnetic tape, Figure 6 is a schematic perspective view of the main parts of the finishing apparatus for magnetic tape media according to the present invention, and Figure 7 shows processing of magnetic tape media by the magnetic tape manufacturing method according to the present invention. This is the surface roughness data. In the figure, 2 is a magnetic tape, 5 is an oblique scanning rotary head, 2
1 is a feeding reel, 22.23 is a roller, 24 is a take-up reel, 25 is an abrasive tape, 26.28 is a roller, 27
is a pressure roller. Figure 1 ν Figure 3 and figure 4 S box Figure 1

Claims (1)

[Claims] A tape adhered to a fine abrasive material is wound around a pressure roller that presses the magnetic tape, and the pressure roller is arranged between the feed reel and the take-up reel of the magnetic tape, and the surface of the magnetic film surface of the magnetic tape is A magnetic tape manufacturing method characterized by a rolling finish.