JPH0261856A - Magnetic recording and reproducing device and magnetic recording medium used for the same - Google Patents

Abstract

PURPOSE:To obtain output by increasing the contact margin of a two plane recording and reproducing type elastic magnetic medium by providing a means to attach torque around a pitching axis on at least one side of a head and varying the torque generated at the means to a prescribed value at the time of performing recording and reproduction by sandwiching both planes of the medium with magnetic heads. CONSTITUTION:The output value of a recording and reproducing signal from the magnetic head 70 is detected by a recording and reproduction circuit 10 that is also an output value detecting means, and a torque generating means 12 is controlled by a torque control circuit 11 that is a torque varying means so as to maximize the output value from the head 70. Here, a various kinds of control methods of the circuit 11 can be taken, for example, a torque value of -40 to +80(gf.mm) is attached variably on the head 70, and it is controlled by a stepping motor 1 which comprises the means 12. In such a manner, the allowable value of a manufacturing and mounting error is increased and the head can be brought into contact with the medium without increasing a contact area with a high margin.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application) The present invention relates to a magnetic recording and reproducing device that records and reproduces signals by contacting a magnetic recording medium. The present invention relates to a magnetic recording/reproducing device and a magnetic recording medium with improved contact conditions.

(Prior Art) Conventionally, as a magnetic recording and reproducing device for recording and reproducing signals,
Various floppy disk devices are used. Fifth
The figure is a diagram showing a magnetic heel 70 used in a general FAYB disk device. 73 is formed. Further, the magnetic recording medium facing surface 74 of the magnetic head 0 has a planar shape. The magnetic gear 75 is located approximately at the center of the flat surface of the magnetic core 73 in the direction in which the magnetic recording medium runs.

There are two types of floppy disk drives: single-sided and double-sided.Double-sided floppy disk drives are more advantageous in terms of storage capacity.
As shown in FIG. 6, a magnetic recording medium 80 is sandwiched from both sides of the back, and signals are recorded and reproduced in this state. The upper and lower magnetic fields of the RAD slider face each other,
The magnetic cores 73 are positioned so as not to face each other in order to prevent magnetic interference between the upper and lower magnetic heads 0.

In addition, the flat parts of the upper and lower magnetic heads 0 are connected to the magnetic recording medium 8.
7, both or either of the magnetic helads 70 are supported as shown in FIG. That is, the magnetic head 70 is attached to a gimbal spring 91, and the gimbal spring 91 is fixed to a carrier V-jie 92. The carriage 92 is provided with a pivot 93, which acts on the center of the length of the flat portion of the magnetic head in the magnetic recording medium running direction, and does not press against the magnetic head 70 via the gimbal spring 92. It is empowering.

By supporting the magnetic head 0 in this way, the magnetic head 0 has a degree of freedom of rotation around the point of action of the pivot 93, and the uneven contact caused by mounting errors is prevented, and the plane of the magnetic head 70 is fixed. magnetic recording medium 80
I try to bring it into contact with.

The magnetic head and magnetic head support structure of the double-sided floppy disk device for boat fishing have been explained above.
In conventional double-sided floppy disk drives, in order to bring the magnetic gear lip into contact with the magnetic recording medium, the entire surface of the magnetic head facing the magnetic recording medium is brought into contact with the magnetic recording medium.

By the way, what must be considered when designing the magnetic head shape and magnetic head support structure?

■ Allow for errors in manufacturing and installation, and how large a margin can be made to bring the magnetic gap into contact with the magnetic recording medium.

■How can we reduce the load on magnetic recording media?

There are two points.

As mentioned above, in the case of conventional double-sided floppy disk drives, in order to satisfy the first point, the surface of the magnetic head facing the magnetic recording medium is made into a flat shape, the magnetic head is gimbally supported, and the flat part of the magnetic head is The entire surface 1f is brought into contact with the magnetic recording medium to bring the magnetic gap into contact with the magnetic recording medium. Furthermore, in order to provide a larger margin, the pressing force of the magnetic head is increased. Alternatively, a method can be taken to reduce the area of the flat part of the magnetic head, that is, to increase the contact surface pressure over the entire flat part of the magnetic head. However, increasing the contact pressure on the entire flat surface of the magnetic head goes against the second consideration, which is to reduce the load on the magnetic recording medium. In other words, increasing the contact pressure on the entire flat surface of the magnetic head leads to a reduction in the durability of the magnetic recording medium.

(Problem to be Solved by the Invention) Conventionally, in order to easily bring the magnetic gap into contact with the magnetic recording medium, it is necessary to increase the contact pressure between the flat part of the magnetic head and the magnetic recording medium. On the other hand, increasing this contact surface pressure has the contradictory problem of deteriorating the durability of the magnetic recording medium.

The present invention has been made in consideration of the above circumstances, and its purpose is to maintain good contact between the magnetic gear V and the magnetic recording medium while the load on the magnetic recording medium is sufficiently small. An object of the present invention is to provide a magnetic recording/reproducing device and a magnetic recording medium used therein, which achieve improved durability of the magnetic recording medium.

[Structure of the invention]

(Means for resolving the problem) In the present invention, in a magnetic recording and reproducing apparatus which performs recording and reproducing of signals by sandwiching a double-sided recording and reproducing type flexible magnetic recording medium between front and back surfaces between magnetic heads, at least one of the magnetic heads is provided. It is characterized in that one side is provided with a torque variable means for varying the pitch of the proboscis cage to a predetermined value.

Further, the torque variable means includes a torque direct variable means for changing the torque value given by the torque generating means, and an output direct detecting means for detecting the recording/reproducing output direct of the magnetic head when the torque direct is changed. and a torque determining means for controlling the torque generating means so as to select a torque #L in the vicinity where the output power obtained by the output power detection means is the largest, and to obtain a vague torque value. It is characterized by

Further, the magnetic recording medium of the present invention is characterized in that a signal or index corresponding to the predetermined torque value is provided in advance.

Further, in a magnetic recording and reproducing apparatus for recording and reproducing signals by sandwiching the magnetic recording medium on which a signal or index is preliminarily provided between front and back surfaces between magnetic heads, a torque about a biting axis is applied to at least one of the magnetic heads. and a torque control means that detects a signal or index provided in the magnetic recording medium and controls the torque to a predetermined torque value based on the detected signal. There is.

Further, the torque is applied in a direction in which the magnetic head is given a rotational moment in a downstream direction in the running direction of the magnetic recording medium.

(Function) In the device configured in this way, at least one of the magnetic heads is set to vibrate so that the reproduced signal is approximately the best.
It is controlled so that the optimum (predetermined) torque is applied around the swing axis.

Therefore, it is possible to allow manufacturing and weighting errors and to bring the magnetic gap and the magnetic recording medium into contact with a large margin without increasing the contact surface pressure.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings. FIG. 1 is a schematic perspective view showing an extracted and enlarged portion of the magnetic recording/reproducing apparatus of the present invention.

The magnetic head 70 is the same as the conventional one shown in FIG. 5, so detailed drawings are omitted, but two skis 71.7
One ski 71 has a magnetic core 73 formed therein. The magnetic gap 75 is the magnetic core 7
It is placed vertically between the approximate center of the length of the flat portion of No. 3 in the running direction of the magnetic recording medium and the rear end thereof. Note that the magnetic gap 75 is preferably placed vertically on the vk4 side.

The upper magnetic head 70 is mounted on a gimbal spring 9 as in the conventional case.
1, and the gimbal spring 91 looks into the carriage 92. The carriage 92 is provided with a pivot 93 (not shown) as in the conventional case, and a gimbal spring 91
The force is applied to the head at once through 0.

On the other hand, the lower magnetic head 70 is attached to the carriage 95 in a substantially fixed state.

The carriage V-jie 95 supporting the upper magnetic head 70 is fixed to the rotation @l& of the stepping motor 1 via the leaf spring 3.

The upper magnetic head 70 configured in this manner applies rotational torque about the vertical direction of the magnetic recording medium, that is, torque about the biting axis, by rotating the stepping motor l. can.

Further, the pivot 93 rotates the magnetic head 70 on this rotation axis.
The pressure is giving power.

Next, FIG. 2 is a block diagram regarding torque control according to an embodiment of the present invention.

In the present invention, the output value of the recording/reproducing symbol from the magnetic head 70 is detected by the recording/reproducing circuit 10 (output value detecting means). The torque control circuit 11 (torque variable means) is
The torque generating mechanism (torque generator FR) 12 is controlled so that the output value from the magnetic head 70 is the best, and torque around the pi-V proboscis axis is applied to the magnetic head 70.

Although there are various methods of controlling the torque control circuit 11, for example, the torque control circuit 11 is controlled as follows.

For example, -40 (#f・m
m) to 80 (IIflllmm) is applied variably. The outputs of the recording and reproducing signals of the magnetic head 70 corresponding to these torque values are respectively stored, and the torque value that provides the best output value is selected. The torque generating mechanism 12 (stepping motor 1 in the above embodiment) is controlled so that the torque closest to the selected torque is applied to the magnetic force 70.

Here, the present inventors variously changed the torque force given by the torque generating mechanism 12 (actually, by changing the rotation angle of the stepping motor l, the torque force generated around the pistoning axis was changed). We investigated the recording and reproducing outputs of three types of magnetic recording media.

The result is shown in Figure 3.

FIG. 3 shows experimental results in which the horizontal axis represents the torque applied to the magnetic head 7 (H) around the shaft of the V proboscis, and the vertical axis represents the output ratio.

Here, the torque on the horizontal axis is the torque at the pivot 9 as shown in Figure 4.
3 (the pivot 93 does not need to be located at the center of the magnetic head 70 in the medium running direction).
The torque that gives the moment of rotation in the downstream direction of the traveling direction of 0 is positive (plus), and the torque that gives the moment of rotation in the upstream direction of the traveling direction! It is specified as '2 negative (minus).

Further, the output ratio on the vertical axis indicates the percentage fr% of the maximum output value when the torque is changed.

What should be noted in the experimental results shown in Figure 3 is that the characteristics of the output ratio differ depending on the type of medium.

In other words, in a general magnetic recording/reproducing device, since no torque is applied as in Motomotomei, if the torque is zero, the output ratio is 0.95 for the A medium. B medium o, 77, C medium 0
．． 75, and only 0.75 to 0.95L was obtained.

In addition, the maximum output ratio [1, Ori-torque indicated is ^
The media are 10#f-mm, the B medium is 30#f*mm, and the C medium is 40flfφmm, which are completely different.

Therefore, in the conventional case, there are disadvantages such as not being able to obtain sufficient output for some media, or increasing the contact pressure to increase the margin, which poses problems in media durability. However, according to the present invention, since the torque coefficient can be controlled to a predetermined value depending on the medium, sufficient output can be easily obtained, and the contact surface pressure can be reduced, thereby improving the durability of the medium.

The above-mentioned optimum torque value is considered to vary depending on the coefficient of friction l between the magnetic recording medium and the magnetic head, and is specific to the medium.

Therefore, if the type of media to be used is almost limited, in addition to the torque control method shown above, it is possible to use the The torque can also be selected depending on the medium to be used.

Further, in connection with the above, there are also the following torque control methods. In other words, the optimum torque value is determined in advance according to the type of medium. A signal corresponding to this torque value is recorded on a predetermined track of the magnetic recording medium (for example, on the outermost track of the information recording area or outside the range of the information recording area), and this signal is read by the magnetic head 70. In response to this information, the torque control means is controlled to a predetermined torque value.

Alternatively, an index corresponding to the optimum torque value (for example, an optical marking on the magnetic recording medium or a mechanical marking such as a protrusion) may be formed in advance on the magnetic recording medium, and this indicator may be used. A detection means (a light source, a light receiving element, etc. if it is an optical indicator) is provided to detect the optimum torque, and the torque control means is controlled accordingly so that a predetermined torque value is achieved. It's okay.

Note that an output ratio of 0.8 or more is sufficient for most media.

2. The present invention can be used in various modifications without being limited to the above embodiments.

9, the stepping motor 1 of the torque generating mechanism 12
Alternatively, the rotational drive means such as an ultrasonic motor may be used.

Alternatively, the carriage 92 may be supported rotatably around a pitching axis relative to a fixed part, and torque may be applied by pressing the downstream side of the carriage IJ and the carriage 92 in the medium running direction with an actuator (for example, a piezoelectric element, etc.). good.

Furthermore, it goes without saying that a configuration may be adopted in which torque can be applied to both the upper and lower magnetic heads 70.

〔Effect of the invention〕

As detailed above, according to the present invention, the magnetic gap and the magnetic recording medium can be brought into contact with a large margin without increasing the contact surface pressure while allowing manufacturing and installation errors, thereby increasing the output. can be obtained sufficiently, and the durability of the medium is also improved.

[Brief explanation of the drawing]

FIG. 1 is an enlarged perspective view of the main parts of the magnetic recording and reproducing apparatus according to the present invention, FIG. 2 is a perspective view showing the torque control method according to the present invention, and FIG. FIG. 4 is a conceptual diagram illustrating how torque is applied according to the present invention, and FIGS. 5 to 7 are diagrams showing a conventional magnetic head and support mechanism. 1...Stepping motor (torque generating means), 3.
...Plate spring, 10...Recording/reproducing circuit (output direct detection means), 11...Torque control circuit (torque control means)%1
2... Torque generating mechanism (torque generating means), 70...
・Magnetic head, 75...Magnetic gap, 80...Magnetic recording medium, 91...Gimbal spring, 92.95...
・Carriage, 93...Pivot. Figure 1 Agent Patent Attorney Nori Ken Ken Yudo Matsuyama Hikaru's Figure 2 Mq Intermediary, regular direction diagram

Claims (5)

[Claims] (1) In a magnetic recording and reproducing device that performs recording and reproducing of signals by sandwiching a double-sided recording and reproducing type flexible magnetic recording medium between front and back surfaces between magnetic heads, a torque that applies torque around a pitching axis to at least one of the magnetic heads. 1. A magnetic recording and reproducing apparatus comprising: a generating means; and a torque varying means for varying the value of torque provided by the torque generating means to a predetermined value. (2) The torque variable means includes a torque value variable means for changing the torque value given by the torque generating means, and an output value detector for detecting the recording/reproducing output value of the magnetic head when the torque value is changed. and torque value determining means for selecting a nearby torque value at which the output value obtained by the output value detecting means is the largest, and controlling the torque generating means so that the torque value is approximately equal to this torque value. 2. The magnetic recording and reproducing apparatus according to claim 1. (3) A magnetic recording medium characterized in that a signal or index corresponding to the predetermined torque value is provided in advance. (4) In a magnetic recording and reproducing apparatus for recording and reproducing a signal by sandwiching the magnetic recording medium between the front and back surfaces of the magnetic recording medium according to claim 3, a torque generating means for applying torque around a pitching axis to at least one of the magnetic heads; A magnetic recording/reproducing apparatus comprising: a torque control means for detecting a signal or index provided in the magnetic recording medium and controlling the torque to a predetermined torque value based on the detection signal. (5) The magnetic recording/reproduction according to claim 1 or 4, wherein the torque is applied in a direction in which the magnetic head is given a rotational moment in a downstream direction in the running direction of the magnetic recording medium. Device.