JPS6232375Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a magnetic recording and reproducing device that levitates and rotates a flexible magnetic sheet on a stabilizing plate and records or reproduces signals on the magnetic sheet using a magnetic head. To absorb changes in the contact state between the magnetic sheet and the magnetic head that occur when the stabilizing plate is deformed due to heat or changes over time, and to always maintain a stable contact state between the magnetic sheet and the magnetic head. It is something.

Normally, the flying height of the magnetic sheet on the stabilizing plate is greatly influenced by the height of the stabilizing plate and the magnetic sheet mounting table at the center of rotation. Further, as a characteristic of the magnetic sheet, it has a property of floating and rotating following the flatness of the stabilizing plate when it floats and rotates.

Conventionally, as a method of absorbing changes in the flying height of the magnetic sheet caused by deformation of the stabilizing plate due to heat or changes over time, the amount of change in the flying height of the magnetic sheet is anticipated in advance, and the magnetic head relative to the magnetic sheet is adjusted accordingly. There was a way to increase the amount of insertion. However, this case has the disadvantage that the magnetic sheet life is extremely short due to the large insertion amount of the magnetic head. Furthermore, since the insertion amount of the magnetic head changes due to thermal deformation of the stabilizing plate, it is not always possible to obtain a stable contact state between the magnetic sheet and the magnetic head, which poses a problem in terms of recording and reproducing characteristics.

The present invention provides a means for solving such problems, and embodiments of the present invention will be described below based on the drawings. A flat stabilizing plate 2 having a through hole 1 in the center is fixed onto studs 4 implanted in a substrate 3 with screws 5. This stabilizing plate 2
A thrust plate 6 is fixed to the lower surface of the center. Further, the inner ring of the retainer 8 that holds the ball group 7 is fitted and supported by the outer circumferential portion of the magnetic sheet mounting table 9, and furthermore, a thrust plate 10 is fixed to the stepped portion of the magnetic sheet mounting table 9. This thrust plate 6, ball group 7
The thrust plate 10 constitutes a thrust bearing. On the other hand, a rotary drive shaft 13 is fixed to a shaft 12 of a motor 11 fixed to the substrate 3 with a screw 14 . The rotary drive shaft 13 and the inner circumferential portion of the magnetic sheet mounting table 9 are provided so as to be slidable in the vertical direction, and the magnetic sheet mounting table 9 is always urged upward by a compression spring 15. The pin 16 implanted in the magnetic sheet mounting table 9 is connected to the rotational drive shaft 1
3, the magnetic sheet mounting table 9
gives rotational driving force to. The magnetic sheet 18 is fixed to the magnetic sheet mounting table 9 via a presser seat 19 with screws 20. On the lower surface of the center of the stabilizing plate 2 is a fourth
As shown in the figure, radial grooves 21 are provided to form air inflow holes for stably floating and rotating the magnetic sheet 18.

The approximately U-shaped head control member 22 has a support plate 23.
It is rotatably mounted around a shaft 24.
Retaining rings 25 are provided at both ends of the shaft 24, and the support plate 23 is fixed to the base plate 3 with screws 26. A detection pin 27 that contacts the stabilizing plate 2 is implanted in one arm 22a of the approximately U-shaped head control member 22, and is connected to the other arm 22b of the head control member 22 via the stabilizing plate 2. The head base 29 has a magnetic head 28 fixed to its tip.
are fixed with screws 30. In addition, tension spring 3
1 is mounted between a head control member 22 and a support plate 23, and is configured such that the detection pin 27 is always in contact with the lower surface of the stabilizing plate 2.

Next, the operation will be explained. The height between the center of the stabilizing plate 2 and the magnetic sheet mounting table 9 is set in advance to a certain amount, and when the motor 11 rotates in this state, the rotation drive shaft 13 and the magnetic sheet mounting table 9 rotate integrally. Then, the magnetic sheet 18 floats a certain amount above the stabilizing plate 2 and starts steady rotation. In this state, the detection pin 27 provided on one arm 22a of the head control member 22 is in contact with the lower surface of the stabilizing plate 2.
The magnetic head 28 provided on the other arm 22b is fixed at a height that optimizes the amount of insertion of the head into the magnetic sheet 18. Next, a case will be described in which the outer periphery of the stabilizing plate 2 is curved upward from this state due to heat, change over time, or the like.

At the center of rotation of the magnetic sheet 18, a stabilizing plate 2
With this deformation, the thrust bearing parts 6, 8,
10, the magnetic sheet mounting table 9 is pushed down against the spring 15, and the height between the stabilizing plate 2 and the center of rotation of the magnetic sheet 18 is always unchanged, and The flying height of the magnetic sheet 18 from the stabilizing plate 2 also remains constant. Next, in the vicinity of the magnetic head 28, as the stabilizing plate 2 curves upward, the detection pin 27 follows the deformation, and the head control member 22 rotates clockwise and is fixed to the head control member 22. The magnetic head 28 also moves upward. In other words, the magnetic head 28 also follows the displacement amount of the stabilizing plate 2 (corresponding to the displacement amount of the magnetic sheet 18). (5th
(See figure) Also, if the stabilizing plate 2 deforms in the opposite way to the above,
Or the magnetic sheet 18 for local deformation of the stabilizing plate 2 at the center of rotation or at the position of the magnetic head 28.
Similarly, the magnetic head 28 follows the floating displacement.

Next, another embodiment of the present invention will be described. Identical members are given the same numbers. In FIG. 6, a lever 40 on which a detection pin 27 is implanted and a lever 41 on which a head base 29 is fixed are rotatable about shafts 43 and 44 provided on a support plate 42, respectively. There is. The other ends of the lever 40 and the lever 41 are supported by shafts 46 and 47, respectively, via a connecting piece 45. Also, tension spring 4
8 is mounted between the lever 40 and the support plate 42,
The detection pin 27 is configured so as to always come into contact with the lower surface of the stabilizing plate 2.

In FIG. 7, a magnetic head 28 is installed from the bottom surface of the stabilizing plate 2. A lever 50 to which the head base 29 and detection pin 27 are fixed is rotatable about a shaft 52 provided on a support plate 51. A tension spring 5 is connected between the other end of the lever 50 and the support plate 51.
3 is mounted so that the detection pin 27 is always in contact with the lower surface of the stabilizing plate 2. With this configuration, the displacement of the stabilizing plate 2 in the approximate vicinity of the position of the magnetic head 28 can be detected, and the magnetic head 28 can be made to follow the displacement of the magnetic sheet 18.

As described above, according to the present invention, when the flying height of the magnetic sheet changes due to deformation of the stabilizing plate due to heat or aging, the magnetic head reliably follows the displacement of the magnetic sheet. As a result, a stable contact state between the magnetic head and the magnetic sheet can be obtained at all times, which eliminates the need to unnecessarily increase the insertion amount of the magnetic head by taking into account the amount of floating displacement of the magnetic sheet in advance, as in the past. There is no need to store the magnetic sheet, and the service life of the magnetic sheet can be extended.

[Brief explanation of the drawing]

Fig. 1 is a plan view of an apparatus showing an embodiment of the present invention, Fig. 2 is a side cross-sectional view of the main parts, Fig. 3 is a side view of the sheet mounting table of the apparatus, and Fig. 4 is a side view of the apparatus. FIG. 5 is a side view for explaining the operation of the stabilizing plate, FIG. 6 is a side sectional view showing an embodiment of the present invention, and FIG. 7 is a side view of another embodiment of the present invention. It is a side sectional view showing an example. 2... Stabilization plate, 6, 10... Thrust plate, 7
...Ball group, 9...Magnetic sheet mounting table, 11...
...Motor, 13...Rotation drive shaft, 18...Magnetic sheet, 22...Head control member, 27...Detection pin, 28...Magnetic head, 31...Spring.

Claims (1)

[Scope of utility model registration request] In a magnetic recording and reproducing device, a flexible magnetic sheet whose center part is fixed to a magnetic sheet mounting table is levitated and rotated on a stabilizing plate, and a magnetic head records and reproduces signals on the magnetic sheet. A thrust bearing is configured between the magnetic sheet mounting base and the magnetic sheet mounting base so as to be slidable in the vertical direction on the drive shaft, and the magnetic sheet mounting base is always biased in the direction of the stabilizing plate. A magnetic recording and reproducing apparatus characterized in that a magnetic head is disposed on a member that moves in accordance with the amount of displacement of the stabilizing plate in the vicinity of the recording and reproducing position.