JPS6284402A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To simplify constitution and to facilitate processing by providing a rotating member having a rotating center axis which orthogonally intersects with a magnetic with a magnetic tape face approximately in the center of the width of a magnetic tape and a main magnetic pole which is installed on the rotating member, contacts the magnetic tape and rotates on a plane in parallel with the magnetic tape face. CONSTITUTION:A rotating disk 32 is fitted on the axis 31 having the rotating center which orthogonally intersects with the travel face of the magnetic tape 22 approximately in the center of the width of the magnetic tape 22, and rotates the direction of an arrow C. The rotating disk 32 is provided with four main magnetic poles 33 by 90 deg.. The main magnetic pole 33 is so constituted that comes into contact with the magnetic tape lying on an auxiliary magnetic pole 27 so as to rotate, and the auxiliary magnetic pole 27 is arranged so that the clearance between the main magnetic pole 33 and the auxiliary magnetic pole 27 can be constant in parallel with the rotating surface of the main magnetic pole 33. The 1st and 2nd travel guides 24 and 25 guide the magnetic tape 22 so that it can be in parallel with the rotating plane of the main magnetic pole 33 and so that the travel face of the magnetic tape can be obtained at excellent flatness. Thus the constitution is simplified, assembly and adjustment are facilitated, and the titled device can be produced at a reduced cost.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a magnetic recording/reproducing device using perpendicular magnetic recording.

2. Description of the Related Art In recent years, perpendicular magnetic recording has been devised as a method for improving recording density. Apparatuses have been developed that apply this perpendicular magnetic recording method to record and re-read signals on magnetic tape using a rotary head method. (For example, JP-A-58-
12124, JP-A-59-36314).

The conventional magnetic recording/reproducing device shown above will be described below with reference to the drawings. FIGS. 4 and 5 are perspective views showing the configuration of a conventional magnetic recording/reproducing device.

In FIG. 4, a main magnetic pole 1.1' is arranged in a spiral shape near the outer peripheral surface of a rotating drum 3 around which a magnetic tape 2 is wound. The magnetic tape 2 is wound parallel to the outer periphery of the rotary drum 3 around a post 4.4' which also serves as a restriction to the rotary drum 3. It is comprised of an auxiliary magnetic pole 5 that faces the rotating drum 3 with the magnetic tape 2 in between and is disposed with a predetermined gap from the magnetic tape 2, and a signal coil 6 wound around the auxiliary magnetic pole 5. The auxiliary magnetic pole 5 is inclined by θ with respect to the rotating wheel of the rotary drum 3, and this angle θ determines the inclination of the recording pattern on the magnetic tape 2.

In FIG. 5, the main magnetic pole 7 is installed on the rotating drum 8 so that the trunk width direction is perpendicular to the rotating direction of the rotating drum 8. The surface of the auxiliary magnetic pole 9 facing the rotating drum is a cylindrical curved surface having the same center as the rotating drum 8 so that the distance between the main magnetic pole 7 and the auxiliary magnetic pole 9 is constant during magnetic recording and reproduction.

Further, the auxiliary magnetic pole 9 has a signal winding &110 in the winding H.

The magnetic tape 11 is curved to pass between the auxiliary magnetic pole 9 and the rotating drum 8.

The operation of the magnetic recording/reproducing apparatus configured as described above will be explained below.

In FIG. 4, when a recording current flows through the winding 6, a magnetic field is generated within the auxiliary magnetic pole 5 according to the signal. At this time, auxiliary magnetic pole 5
The magnetic field inside reaches the main magnetic pole 1 arranged in a spiral shape near the outer periphery of the rotating drum 3. Therefore, the portion of the magnetic tape 2 sandwiched between the auxiliary magnetic pole 5 and the main magnetic pole 1 is magnetized, and as the rotating drum 3 rotates, the magnetic tape 2-
A recording pattern is formed diagonally on the left side.

In FIG. 5, a recording pattern is formed on the magnetic tape 11 by the auxiliary magnetic pole 9 and the main magnetic pole 7 in substantially the same manner as described above. The recording pattern at this time is approximately perpendicular to the longitudinal direction of the magnetic tape 11, as shown in FIG.

Problems to be Solved by the Invention However, in the configuration as shown in FIG. Main pole 1
There was also a problem in that it had to be processed into a spiral shape.

Furthermore, even in the configuration shown in FIG. 5, it is necessary to precisely process the surface of the auxiliary magnetic pole 5 facing the rotating drum so that it becomes a curved surface having the same center as the rotating drum 8, and the magnetic tape 11 must also be curved. There was a problem in that the vehicle had to be guided.

SUMMARY OF THE INVENTION In view of the above problems, the present invention provides a magnetic recording/reproducing device in which the structure of the auxiliary magnetic pole and the main magnetic pole is simple and easy to process, and the magnetic tape can be easily guided.

Means for Solving the Problems In order to solve the above problems, the magnetic recording and reproducing apparatus of the present invention includes a rotating member having a central axis of rotation approximately at the center of the width of the magnetic tape and perpendicular to the surface of the magnetic tape. , a main magnetic pole provided on the rotating member H and in contact with the magnetic tape and rotating in a plane parallel to the magnetic tape surface; and a signal winding provided facing the main magnetic pole with the magnetic tape in between. and a guide member that guides the magnetic tape in parallel with the rotation plane of the main pole.

Operation According to the present invention, with the above-described configuration, the main magnetic pole need only be installed in a necessary part of the rotating member, and the main magnetic pole may have a simple structure. Furthermore, since the magnetic tape is run parallel to the plane of rotation of the main pole, the magnetic tape may be guided by a planar guide instead of a helical guide or dowel guide. Furthermore, since the auxiliary magnetic pole only needs to have a plane parallel to the rotation plane of the main magnetic pole, highly accurate curved surface machining is not required.

EMBODIMENT A magnetic recording/reproducing apparatus according to an embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a plan view of the magnetic recording/reproducing apparatus of the present invention, FIG. 2 is a side view of the same, and FIG. 3 is a sectional view taken along the line AA' in FIG.

The magnetic tape 22 coming out from the supply reel 21 is attached to the guide roller 2
You can change direction with 3. The first running guide 24 and the second running guide 25 regulate the running of the magnetic tape 22 in the running surface and width direction. An auxiliary magnetic pole 27 having a signal winding 26 wound thereon is installed between the first traveling guide 24 and the second traveling guide.
It is made so that it is parallel to . Capstan 28 and pinch roller 29 work together to transport magnetic tape 22 in the direction of arrow B. The transferred magnetic tape 22 is taken up by a winding roller 30
rolled up.

A rotating disk 32 is attached to a shaft 31 having a rotation center approximately at the center of the width of the magnetic tape 22 and perpendicular to the running surface of the magnetic tape 22, and rotates in the direction of arrow C. Four main magnetic poles 33 are attached to the rotating disk 32 at every 90°.

The main magnetic pole 33 is configured to rotate in contact with the magnetic tape 22 located at least on the auxiliary magnetic pole 27''. Main magnetic pole 3
The auxiliary magnetic pole 27 is arranged parallel to the rotating surface of the main magnetic pole 33 so that the clearance between the main magnetic pole 33 and the auxiliary magnetic pole 27 is constant.

The first traveling guide 24 and the second traveling guide 25 are connected to the main magnetic pole 33
The main magnetic pole 3
3 and the magnetic tape 22 can be uniform and stable.

The second traveling guide 25 is connected to the magnetic tape 22 as shown in FIG.
The main magnetic pole 3
3 begins to come into contact with the magnetic tape 22
Since the end face of the magnetic tape 22 is bent and guided toward the auxiliary magnetic pole side, the main magnetic pole 33 will not come into contact with the end face of the magnetic tape 22 and cause damage. The first traveling guide is also designed to guide the magnetic tape 22 in substantially the same manner.

The operation of the magnetic recording/reproducing apparatus configured as described above will be explained.

When a recording current is passed through the signal winding 26, a magnetic field corresponding to the signal is generated in the auxiliary magnetic pole 27. At this time, when the main magnetic pole 33 is located at a position facing the auxiliary magnetic pole 27 with the magnetic tape 22 in between, the magnetic field of the auxiliary magnetic pole 27 is converged on the main magnetic pole 33, so that it is eventually located between the auxiliary magnetic pole 27 and the main magnetic pole 33. magnetic tape 2
Each time a part of 2 becomes magnetized. Therefore, the rotating disk 32
rotates in the direction of arrow C, and the main magnetic pole 33 passes over the auxiliary magnetic pole 27, thereby forming an arcuate magnetized portion on the magnetic tape 22. Since the magnetic chip 122 is transported in the direction of arrow B by the capstan 28 and the pinch roller 29, a continuous arc-shaped recording pattern is obtained.

In this embodiment, arc patterns are sequentially recorded using four main magnetic poles, and the number of rotations of the rotating disk 32 and the width of the magnetic tape 22 are determined so that one arc can record just one field of a television signal. be.

The number of main magnetic poles is not limited to four. It is also obvious that it is also possible to record one part of one field or several fields in one arc.

Effects of the Invention As described above, according to the present invention, there is provided a rotating member having a rotating shaft central axis approximately in the center of the width of a magnetic tape and perpendicular to the surface of the magnetic tape, and a rotary member provided on the rotating member and the magnetic tape. a main magnetic pole that rotates in a plane parallel to the surface of the magnetic tape; an auxiliary magnetic pole having a signal winding provided opposite to the main magnetic pole with the magnetic tape in between; Since the magnetic tape consists of a guide member that guides the tape to run parallel to the rotating plane of the magnetic tape, it is easy to guide the tape run by simply running the magnetic tape in a plane, and there is no need for lead processing as in helical running. .

Since the main magnetic pole only needs to be installed at the required part of the rotating member, it has a simple shape and is easy to process. Furthermore, since the shape of the auxiliary magnetic pole may be such that it has a surface parallel to the rotating surface of the main magnetic pole, the addition T is good, and it can be manufactured very easily and at low cost.

As described above, the magnetic recording/reproducing device according to the present invention has a simple structure and is easy to process, assemble, and adjust, so it can be manufactured at low cost.

[Brief explanation of drawings]

FIG. 1 is a plan view of an embodiment of the present invention, FIG. 2 is a side view of an embodiment of the present invention, FIG. 3 is a sectional view taken along line AA' in FIG.
FIG. 5 is a perspective view of a conventional magnetic recording/reproducing device. 22...Magnetic tape, 32...Rotating disk, 27...Auxiliary magnetic pole, 33...Main magnetic pole.

Claims (2)

[Claims] (1) A rotating member having a central axis of rotation approximately in the center of the width of the magnetic tape and perpendicular to the magnetic tape surface, and a plane provided on the rotating member, in contact with the magnetic tape, and parallel to the magnetic tape surface. a main magnetic pole that rotates within the main magnetic pole; an auxiliary magnetic pole having a signal winding provided opposite to the main magnetic pole with the magnetic tape in between; and a guide that guides the magnetic tape to run parallel to a plane of rotation of the main magnetic pole. A magnetic recording and reproducing device consisting of members. (2) The magnetic recording and reproducing apparatus according to claim 1, further comprising a guide member that guides the running of the magnetic tape so that the end surface of the magnetic tape on the side where the main magnetic pole starts to come into contact is bent toward the auxiliary magnetic pole.