JPH01165080A - Rotating magnetic sheet device - Google Patents

Abstract

PURPOSE:To prevent the sticking phenomenon of a magnetic sheet to a magnetic head sliding and contact face at the time of stopping a rotation by separating the magnetic head from the magnetic sheet during a period from the stop of the driving of the magnetic sheet to the stop of a continuous rotation. CONSTITUTION:When a stop mode is instructed from a stop button S, the control signal of a mode control circuit 14 goes to L to interrupt the driving force in a motor 4 and the motor 4 shifts to the stop of the rotation while continuing to rotate by an inertia. In this case, when a control signal outputted from the circuit 14 is inputted to a motor driving circuit 15, it is also inputted to the control circuit 18 of a plunger 9. Then, the circuit 18 outputs the control signal to the driving circuit 17 for a prescribed time enough to stop the rotation by the inertia and the plunger 9 attracts a movable piece. According to the attracting operation of this movable piece, a magnetic head block 5 is retracted from the magnetic sheet 1 by the prescribed quantity. This state is held until the rotation of the sheet 1 is at least stopped, so that at the time of stopping the rotation of the sheet 1, the sticking phenomenon may not be possibly generated.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a rotating magnetic sheet device, and in particular to a rotating magnetic sheet device in which a flexible magnetic sheet is rotated at high speed and a magnetic head is brought into contact with the rotating magnetic sheet to record and reproduce signals. The present invention relates to a magnetic sheet device.

[Conventional technology]

In high-density magnetic recording and reproducing devices that record and reproduce information by bringing a magnetic head into contact with a magnetic sheet that rotates at high speed, it is necessary to obtain a stable contact state between the magnetic sheet and the magnetic head in order to achieve stable recording and reproduction. This is very important. As a head contact method for obtaining this stable contact state, an apparatus using a suction head sliding contact member as shown in US Pat. In these devices, by arranging the flat part of the head sliding contact member and the rotating magnetic sheet surface to have a negative taper angle, an inverted wedge formed by the magnetic sheet surface and the sliding member flat surface is created. Negative pressure is generated in the space to attract the magnetic sheet to the head sliding contact member,
A magnetic head provided at the center of the plane of the sliding member records or reproduces multiple signals.

[Problem that the invention seeks to solve]

Although the above-described conventional technique can be said to be a head contact method suitable for obtaining a stable head touch, the following problem may occur when the rotation of the magnetic sheet is stopped. That is, in order to stably attract the magnetic sheet, the surface of the sliding contact member is finished in a mirror-like state, and the head contacting surface of the magnetic sheet is also made of a smooth surface with good surface properties in order to ensure performance in recording and reproducing characteristics. Furthermore, in order to improve the sliding durability of the magnetic sheet, the surface of the magnetic sheet is impregnated with a lubricant. When the rotation of the magnetic sheet that is rotating and adsorbed under these conditions is stopped, the air film layer that stably existed between the sliding surface and the magnetic sheet immediately before the rotation stopped becomes thinner, and the magnetic sheet The lubricant of the magnetic sheet may act between the sheet and the sliding surface, causing an adhesion phenomenon in which the magnetic sheet sticks to the sliding surface. If this happens, there is a risk of damaging or damaging the magnetic sheet)
Furthermore, if a motor with low rotational torque is used, there is a problem that restarting the motor is impossible.

It is an object of the present invention to provide a rotating magnetic sheet device that can eliminate such problems, prevent the above-mentioned sticking phenomenon when rotation is stopped, and prevent damage to the magnetic sheet, failure to restart the motor, etc. It is about providing.

[Means for solving problems]

In order to achieve the above object, the present invention rotates a flexible disk-shaped magnetic sheet, and uses the airflow accompanying the rotation of the sheet to attract the magnetic sheet to the sliding surface of a magnetic head. , a rotating magnetic sheet device for recording and/or reproducing signals, comprising a separating means for separating the relative positional relationship between the magnetic head and the sheet from a recording or reproducing operation position, and rotationally driving the magnetic sheet. The separating means is operated at least during a period from when the motor is stopped until the magnetic sheet is connected and rotated by the inertia of the motor or the like.

[Effect]

When the magnetic head is separated from the magnetic sheet surface during the period from when the rotation of the magnetic sheet is stopped until the rotation stops, the air film layer between the sliding surface on the head side and the magnetic sheet becomes thicker, and the magnetic sheet adsorption becomes unstable or shifts to a non-adsorbed state. In this state, the lubricant does not act and no sticking phenomenon occurs, so there is no risk of damage or breakage of the magnetic sheet or inability to restart the motor.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view showing an embodiment of a rotating magnetic sheet device according to the present invention, in which 1 is a magnetic sheet, 2 is a center core, 3 is a jacket, 4 is a drive motor, 5 is a magnetic head block, 6a, 6b 7 is a guide shaft, 7 is a helad carriage, 8 is a leaf spring, 9 is a plunger, and 10 is a movable piece.

FIG. 2(,) is a sectional view showing the positional relationship during recording and reproducing operations, and parts corresponding to those in FIG. 1 are given the same reference numerals.

FIG. 2(b) is a sectional view showing the positional relationship during the rotation stop operation, and parts corresponding to those in FIG. 1 are given the same reference numerals.

3 is a sectional view showing the relationship between the magnetic head and the magnetic sheet, 11 is a sliding contact surface, 12 is a helad tip, 13 is a sliding member, and parts corresponding to FIG. 1 are denoted by the same reference numerals. is attached.

FIG. 4 is a block diagram showing an example of a circuit configuration for operating a mechanical part when rotation is stopped, in which 14 is a mode control circuit, 15 is a motor drive circuit, 16 is a frequency oscillator, 17 is a drive circuit, and 18 is a control circuit. In the circuit, parts corresponding to those in FIG. 1 are given the same reference numerals.

In these figures, the magnetic sheet 1, which is a signal recording/reproducing medium, is formed based on a polyester film with a thickness of about 40 μm and a diameter of about 50 days, and the center portion is reinforced with a center core. As shown in the figure, it is rotatably housed in a jacket 3 made of synthetic resin. The magnetic sheet 1 is configured such that the spindle portion of the drive motor 4 is fitted into the center core 2 and rotated at 3600 rpm. On the other hand, a magnetic head block 5 for recording or reproducing signals on the magnetic sheet 1 has a sliding surface 11 that attracts the rotating magnetic sheet 1, and a guide shaft 6.
The head carrier guided by a and 6b is attached to a predetermined position of the shifter. The head carriage 7 is slidable on the guide shafts 6a and 6b by a moving mechanism (not shown), whereby the magnetic head block 5 is tracked in the direction of the arrow T shown in FIG. Signals can be recorded or reproduced on a plurality of track positions on the magnetic sheet 1. Further, a protrusion 7a is provided on the head carriage 7, and a plate spring 8 is attached to the helad carriage 7, which clamps the guide shaft 6b with the protrusion 7a. is urged toward the guide shaft 6b.

By pushing down the protrusion 7a of the head carriage 7 against the spring force of the leaf spring 8, the head carriage 7 can be rotated about the guide shaft 6at.

Reference numeral 9 denotes a plunger, which is actuated to attract the movable piece 1o, thereby pushing down the protrusion 7a of the head carriage 7 by a predetermined amount, and as shown in FIG. 2(b), the magnetic head block 5
is retracted by a predetermined amount with respect to the magnetic sheet 1. When the plunger 9 is not in operation, the movable piece 10 is placed completely away from the head carriage 7, as shown in FIG. It is designed so that this will not happen. These K constitute a separating means.

As shown in FIG. 3, the magnetic head block 5 consists of a sliding contact member 13 having a mirror-finished sliding surface 11 and a head chip 12 disposed approximately in the center thereof. It is fixed to the inclined surface of the carriage 7. Due to this inclined surface, the sliding contact surface 11 has a negative taper angle with respect to the rotating surface of the magnetic sheet 1, so when the magnetic sheet 1 is attached to the main body of the device and is not rotating, the magnetic sheet 1 is As shown in the figure, the magnetic sheet 1 is separated from the sliding surface 11, but when the magnetic sheet 1 is rotated at high speed, negative pressure is generated between the magnetic sheet 1 and the sliding surface 11, and the magnetic sheet 1 is separated from the sliding surface 11 as shown by the solid line. is attracted to the sliding contact surface 11, and the head chip 1
2, recording and reproducing operations are possible.

14 is a mode control circuit which outputs each control signal r from a terminal in response to the operation of the play button PBX or the stop button S.
Output HJ or rLJ. 15 is a motor drive circuit in which the control signal output from the mode control circuit 14 is rH.
In the case of J, the magnetic sheet 1 is rotated, and when the control signal is "L", the rotation is stopped. here,
The rotation speed of the magnetic sheet 1 is controlled to a constant rotation speed of 3600 rpm by feeding back the output of a frequency oscillator (FG) 16 provided in the motor 4 to the motor drive circuit 15. Reference numeral 17 denotes a drive circuit for the plunger 9, which operates the plunger 9 in response to a control signal output from the control circuit 18. This control circuit 18 is configured to output a control signal to the drive circuit 171C so that the plunger 9 acts for a predetermined period of time from the time when the control signal from the so-called control circuit 14 changes from "H" to rLJ. has been done.

The operation of the above-described embodiment configured in this manner is as follows.

When the jacket 3 containing the magnetic sheet 1 is attached to the main body of the device and the play button PB shown in FIG. The signal recorded on the magnetic sheet 1 is reproduced when it is attracted to the magnetic head block 5 and brought into the state shown in FIG. 2(a). Next, when the stop mode is instructed by the stop button S, the control signal of the mode control circuit 14 becomes rLJ, the driving force of the motor 4 is cut off, and the motor 4 shifts to a rotation stop while continuing to rotate due to inertia. By the way, since only the above-mentioned rotation stopping operation is performed when the rotation is stopped in the conventional device, there is a possibility that the magnetic sheet 1 may stick to the sliding contact surface 11 immediately before it stops. In contrast, in the rotating magnetic sheet device of this embodiment, the control signal output from the mode control circuit 14 is input to the motor drive circuit 15 and simultaneously input to the control circuit 18 of the plunger 9. Then, the control circuit 18 detects the change in the control signal from rHJ to rLJ, and outputs a control signal to the drive circuit 17 for a predetermined time (approximately 5 seconds in this embodiment) sufficient for the rotation due to inertia to stop. Then, the plunger 9 attracts the movable piece 10. Due to this suction operation of the movable piece 10, the protrusion 7a of the head carriage 7 is pushed down as shown in FIG. In this state, the adsorption force of the magnetic sheet 1 to the magnetic head block 5 is reduced, and the magnetic sheet 1 is separated from the magnetic head block 5 as the rotational speed decreases. Furthermore, since this state is maintained at least until the magnetic sheet 1 stops rotating, the magnetic sheet 1
There is no risk of the sticking phenomenon occurring when the rotation is stopped.

In the above embodiment configured in this way, it is possible to avoid the phenomenon that the magnetic sheet 1 sticks to the sliding contact surface 11 of the magnetic head block 5 when the rotation of the magnetic sheet 1 is stopped. There is no possibility of damage or breakage of the seat 1 or the inability to restart the seat.

FIG. 5 is a perspective view showing a second embodiment of the rotating magnetic sheet device according to the present invention, in which 20 is a height regulating member, 21 is a holding member, 22 is a height determining bin, 23 is a push-up bin, 2
4 is a movable piece, 77 is a helad carriage, and parts corresponding to those in FIG. 1 are given the same reference numerals.

FIG. 6(a) is a sectional view showing the positional relationship during recording and reproducing operations, and parts corresponding to those in FIG. 5 are given the same reference numerals.

FIG. 6(b) is a sectional view showing the positional relationship during the rotation stop operation, and parts corresponding to those in FIG. 5 are given the same reference numerals.

In this second embodiment, the magnetic head block 5 is arranged on the head carriage 77 so that the sliding surface thereof is parallel to the rotating surface of the magnetic sheet 1, and the magnetic head block 5 is placed on the back side of the magnetic sheet 1. By providing the height regulating member 20 of the magnetic sheet 1 on the rotationally upstream side of the magnetic sheet 1, an attraction effect due to the rotation of the magnetic sheet 1 is obtained. This height regulating member 20 is attached to a rotatable holding plate 21, and by moving the free end of this holding plate 21 up and down with a height determining pin 22, it is attached to the head block 5. It is set at a predetermined height position. As shown in FIG. 6, the height determining pin 22 has a push-up pin 23 inserted into its center so as to be movable up and down, and its lower end is supported by a movable piece 24 of the plunger 9. The upper end of this push-up pin 23 is lower than the tip of the height-setting pin 22 when the plunger 9 is not activated, and is lower than the tip of the height-setting pin 22 when the plunger 9 is activated.
The height regulating member 20 is configured to protrude from the upper end of the height regulating member 20 and lift the retaining plate 21 of the height regulating member 20 by a predetermined amount. Further, the height position of the height regulating member 20 set by the height setting pin 22 is a position where the magnetic sheet 1 is slightly pushed down from the sliding surface of the magnetic head block 5, as shown in FIG. 6(a). is set to . When the magnetic sheet 1 is rotated at high speed in this state, a negative pressure is generated between the magnetic head block 5 and the magnetic sheet 1, and the magnetic sheet 1 is attracted to the sliding surface of the magnetic head block 5, thereby recording or reproducing signals. A state in which this is possible is obtained. On the other hand, when the plunger 9 operates, the holding plate 21 is pushed up by the push-up pin 23, as shown in FIG. 6(b).
The height regulating member 20 is also retracted from the magnetic sheet 1 as shown in FIG. In this state, an air current flows between the rotating magnetic sheet 1 and the magnetic head block 5, the magnetic sheet 1 does not attract the magnetic head block 5, and the magnetic head block 5 and the magnetic sheet 1 are separated. The state will be as follows.

The circuit configuration for operating the mechanism of the second embodiment described above may be the same as that shown in FIG. 4 as in the first embodiment.

The operation of the second embodiment configured as described above is as follows.

In the reproduction (or recording) mode, the plunger 9 is in an inactive state as shown in FIG. 6(a). In this state, the magnetic sheet 1 is rotated at a high speed of 3600 rpm, is attracted to the magnetic head block 5, and is in a readable (or recordable) state. When the stop button is operated here, the drive of the motor 4 is stopped and at the same time the control circuit of the plunger 9 is activated, and the plunger 9 attracts the movable piece 24 and becomes the state shown in FIG. 6(b), and the magnetic sheet 1 is a magnetic head block 5
be separated from This state is maintained by the control circuit for a predetermined time period sufficient to completely stop the rotation of the magnetic sheet 1. Therefore, the phenomenon that the magnetic sheet 1 sticks to the magnetic head block 5 during the rotation stop operation period of the magnetic sheet 1 is avoided.

The second embodiment configured in this manner provides the same effects as those produced by the first embodiment.

In each of the above embodiments, the plunger 9 is used as a means for retracting the magnetic head block 5 or the height regulating portion side 20, but the present invention is not limited to this. Of course, each member may be moved mechanically by using the same. Also,
Although the operating period of the plunger 9 is set to a predetermined time sufficient to stop rotation, for example, the rotation state is monitored by the FG specific output of the motor 4, and when it is detected that the rotation of the motor 4 has stopped, the plunger 9 is activated. You may also cancel it.

Thus, various forms can be taken without departing from the scope of the invention.

〔Effect of the invention〕

As described above, according to the present invention, the relative positional relationship between the magnetic head and the magnetic sheet is provided with a separating means for separating the magnetic head from the working position for recording or reproducing, so that at least the magnetic sheet is connected to the motor, etc. from the time of drive stop operation. Since it operates for a period of time until the continuous rotation due to inertia stops, it is possible to prevent the sticking of the magnetic sheet to the sliding contact surface of the magnetic head when the rotation is stopped, so the magnetic sheet is activated when the rotation stops.
Damage to the tonnage or breakage, or inability to restart that occurs when a motor with low rotational torque is used can be avoided, and a highly reliable rotating magnetic sheet device can be provided.

[Brief explanation of the drawing]

FIGS. 1 to 4 show the first part of the rotating magnetic sheet device of the present invention.
FIG. 1 is a perspective view and FIG. 2 (a
) is a sectional view during recording/reproducing operation, FIG. 2(b) is a sectional view during rotation stop operation, FIG. 6 is an enlarged sectional view of the magnetic head section, and FIG. 4 is the circuit configuration for operating the mechanism section. A block diagram showing an example, FIGS. 5 and 6 are explanatory diagrams showing a second embodiment of the present invention, FIG. 5 is a perspective view, FIG. 6(a) is a sectional view during recording and reproducing operation, Figure 6(b)
is a sectional view at the time of rotation stop operation. 1...Magnetic sheet 3...Jacket 4...Drive motor 5...Magnetic head block 6a, 6b...Guide shaft 7.77...Head carriage 9...Plunger 11...Sliding Contact surface 14...Mode control circuit 18...Control circuit 20...Height regulating member 22...Height determining pin 23...Push-up bin.

Claims (1)

[Claims] 1. Recording of signals by rotating a flexible disc-shaped magnetic sheet and attracting the magnetic sheet to the sliding surface of a magnetic head using the air flow accompanying the rotation of the sheet. and/or a rotating magnetic sheet device that performs reproduction, comprising a separating means for separating the relative positional relationship between the magnetic head and the sheet from an operating position where recording or reproduction is performed, and stopping driving of a motor that rotationally drives the magnetic sheet. A rotating magnetic sheet device characterized in that the separating means is operated during at least a period from the time of operation until the magnetic sheet stops continuous rotation due to inertia of a motor or the like. 2. The rotating magnetic sheet device according to claim 1, wherein the separating means is a means for retracting the magnetic head with respect to the magnetic sheet. 3. The rotating magnetic sheet device according to claim 1, wherein the separating means separates the height regulating member of the magnetic sheet from the magnetic head.