JPS6284401A - magnetic recording and reproducing device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a magnetic recording/reproducing device of a novel configuration 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. An apparatus has been proposed that applies this perpendicular magnetic recording method to record or reproduce signals on a magnetic tape using a rotating head method. (For example, JP-A-58-
Publication No. 12124.

JP-A-59-36314).

The above-described conventional magnetic recording/reproducing device will be described below with reference to the drawings. FIGS. 5 and 6 are perspective views showing the configuration of a conventional magnetic recording/reproducing device.

In FIG. 5, 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 by bosses 4, 4' which also serve as restraints 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 at an angle θ with respect to the rotation axis of the rotary drum 3, and this angle θ determines the inclination of the recording pattern on the magnetic tape 2.

In FIG. 6, the main magnetic pole 7 is installed on the rotary drum 8-H so that the track width direction is perpendicular to the direction of rotation of the rotary drum 8. The surface of the auxiliary magnetic pole 9 facing the rotating i' ram is formed into 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, a signal winding 10 is wound around the auxiliary magnetic pole 9. The magnetic tape 11 is made to pass between the auxiliary magnetic pole 9 and the rotating drum 8 in a one-pole manner.

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

In FIG. 5, when a recording current flows through the winding 6, a magnetic field is generated in 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 rotary drum 3 rotates, a diagonal recording pattern is formed on the magnetic tape 2.

In FIG. 6, 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. magnetic 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. 6, it is necessary to process the surface of the auxiliary magnetic pole 5 facing the rotating drum with high precision 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, 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. an auxiliary magnetic pole; and a first magnetic tape for guiding a magnetic tape between the main magnetic pole and the auxiliary magnetic pole so as to run parallel to the rotation plane of the main magnetic pole.
and a second guide means for guiding the magnetic tape so that the magnetic tape does not come into contact with the main magnetic pole located on the opposite side of the auxiliary magnetic pole across the central axis of rotation. .

Function: With the above-described configuration, the main magnetic pole can be simply installed in a necessary part of the rotating member.

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. Further, the main magnetic pole is brought into contact with the magnetic tape only on the side where the auxiliary magnetic pole is located.

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, FIG. 3 is a sectional view taken along the line AA' in FIG. 1, and FIG. 4 is a recording pattern diagram.

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 rotates in contact with the magnetic tape 22 on the auxiliary magnetic pole 27.
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.

Magnetic tape 22 connecting guide roller 23 and supply reel 21
This is to prevent the tape roll on the supply reel side from coming into contact with the main magnetic pole 33 even if it reaches its maximum.

The main magnetic pole 33 is located on the magnetic tape 22 located on the auxiliary magnetic pole 27.
The head contacts the magnetic tape 22 to record and reproduce signals, but does not otherwise contact the magnetic tape 22, so unnecessary head wear and damage to the magnetic tape do not occur.

Of course, the main magnetic pole 33 is configured not to come into contact with the guide roller 23.

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
A part of 2 will be 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.

The magnetic tape 22 has a capstan 28 and a pinch roller 29
Since it is transported in the direction of arrow B, 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.

Note that 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.

In order to record the recording patterns with the highest density, as shown in FIG. 4, the outer and inner peripheral portions of adjacent recording patterns should be in contact with each other at both ends of the circular arcs.

The tension angle of the arc from the center of the tape is α2, the inner radius of the arc is r1, the width of the arc is p, and the tape speed is 'V', then (r0p)2 -v2+r2-2vr cos (180°-α)
If each numerical value is selected to satisfy the relationship, it will be possible to record with the highest density.

Effects of the Invention As described above, according to the present invention, there is provided a rotary member having a rotation center axis approximately in the center of the width of the magnetic tape and perpendicular to the surface of the magnetic tape, and a rotary member provided on the rotary member and in contact with the magnetic tape. A main magnetic pole that rotates in a plane parallel to the magnetic tape surface, an auxiliary magnetic pole having a signal winding provided opposite to the main magnetic pole while sandwiching the magnetic tape, and between the main magnetic pole and the auxiliary magnetic pole. a first guide means for guiding a certain magnetic tape so as to travel parallel to the rotation plane of the main magnetic pole; and a first guide means for guiding a certain magnetic tape so as to run in parallel with the rotation plane of the main magnetic pole, and a first guide means for guiding a certain magnetic tape so that the magnetic tape does not come into contact with the main magnetic pole on the opposite side of the auxiliary magnetic pole across the six axes during the rotation. Since the magnetic tape is comprised of a second guide means for guiding the magnetic tape, the magnetic tape only needs to be run on a plane, and tape running guidance is easy, and lead processing such as helical running is not required. . 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 main magnetic pole comes into contact only with the magnetic tape on the auxiliary magnetic pole, there is less wear on the main pole and less damage to the magnetic tape. 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, it is extremely easy to process and can be manufactured 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.

Since assembly and adjustment are easy, 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 A-A' in FIG. 5 and 6 are perspective views of a conventional magnetic recording/reproducing device. 22...Magnetic tape, 23...Guide roller, 27...Auxiliary magnetic pole, 32...Rotating disk, 33...Main magnetic pole . Name of agent: Patent attorney Toshio Nakao (1 person) Figure 1 27 Broom support magnetic pole rotating disk Figure 2 Contact magnetic pole Figure 3

Claims (1)

[Claims] 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 rotating member that is provided on the rotating member, is in contact with the magnetic tape, and rotates within a plane parallel to the magnetic tape surface. A 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 magnetic tape between the main magnetic pole and the auxiliary magnetic pole parallel to the rotation plane of the main magnetic pole. a first guide means for guiding the magnetic tape to travel along the magnetic tape; and a second guide means for guiding the magnetic tape so that the magnetic tape does not come into contact with a main magnetic pole located on the opposite side of the auxiliary magnetic pole across the central axis of rotation. A magnetic recording and reproducing device consisting of