JPS6141058B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic recording/reproducing apparatus using a rotating magnetic sheet cartridge as a recording medium, and more particularly to an improvement in means for stabilizing the relative positional relationship between a magnetic sheet and a head.

Generally, a magnetic recording/reproducing apparatus using a rotating magnetic sheet cartridge as a recording medium is constructed as shown in FIG. 1 is the motor, 2 is the motor rotation shaft, 3
4 is a rotating magnetic sheet that is integrated with the hub; 5 is a cartridge that houses the magnetic sheet; 6 is a support plate that supports the cartridge; 7 is a support member; and 8 is a base. , 9 is a head moving mechanism installed on the base, 10 is a magnetic head that moves in the radial direction of the magnetic sheet by the head moving mechanism, and its tip is connected to the support plate 6 and the back wall (back plate) 5a of the cartridge 5. The recording surface of the magnetic sheet 4 is contacted through an opening 5b provided in the magnetic sheet 4. When the motor 1 is rotated, the rotating magnetic sheet 4 with the hub 3 fitted onto the rotating shaft 2 rotates along the inner surface of the back wall 5a of the cartridge 5, and the magnetic head 10 causes the magnetic sheet 4 to be rotated. Signals are recorded and reproduced. At this time,
The head 10 is moved to the sheet 4 by the head moving mechanism 9.
When the magnetic sheet 4 is moved in the radial direction, a plurality of concentric tracks or spiral tracks are formed in the magnetic sheet 4.

The head 10 and the magnetic sheet 4 in such a state
The state of contact with is as shown in FIG.
FIG. 2 is a sectional view taken along the line A-A in FIG. 1, and the magnetic sheet 4 rotates in the direction of the arrow. As is clear from FIG. 2, the magnetic sheet 4 is attached to the cartridge 5.
It floats and rotates while maintaining a constant space d with respect to the inner surface of the back wall 5a due to the Bernoulli effect. The contact state between the head 10 and the magnetic sheet 4 at this time is extremely important in magnetic recording. This contact state is generally determined by the amount S of head protrusion by which the tip of the head 10 protrudes from inside the back wall 5a of the cartridge 5. Therefore, the amount of protrusion S, ie, the relative positional relationship between the head 10 and the inner surface of the back wall 5a, must be maintained as accurately as possible. In other words, it is generally necessary to maintain an accuracy of several tens of micrometers.

However, in the conventional device, the cartridge 5 is placed on a support plate 6, whereas the magnetic head 10 is supported on a head moving mechanism 9. It is extremely difficult to accurately set the relative positional relationship between the tip of the cartridge and the inner surface of the cartridge back wall 5a. Moreover, depending on the set state that occurs when the cartridge 5 is attached or detached during use, the relative positional relationship between the tip of the magnetic head 10 and the inner surface of the back wall 5a will slightly shift each time.

To increase the accuracy of the above relative position, head 10
It is necessary to manufacture the cartridge support plate 6 with a high height dimension, and to increase the thickness of the back wall 5a of the cartridge 5 and the accuracy of the inner surface (waviness, surface roughness, etc.). However, the use of such measures makes the cartridge 5 and the entire device very expensive. On the other hand, in order to prevent the cartridge back wall 5a from deforming due to attachment/detachment operations or changes in ambient conditions, the cartridge 5 may be made of a thick metal plate, etc., but this increases the weight of the cartridge 5 and makes it easier to use. This is not preferable because it becomes difficult to handle.

The present invention was made in consideration of these circumstances, and its purpose is to improve the relative position of the head to the magnetic sheet without particularly increasing the machining accuracy of the back wall of the cartridge or making the cartridge particularly robust. It is an object of the present invention to provide a magnetic recording and reproducing device that can stably maintain the positional relationship in an optimum state and perform good recording and reproducing.

Hereinafter, details of the present invention will be clarified with reference to embodiments shown in the drawings. FIG. 3 is a top view of one embodiment of the present invention, and FIG. 4 is a sectional view of the same embodiment.
In FIGS. 3 and 4, reference numeral 11 denotes a motor for rotating the seat, which is mounted on the lower surface of the base 12. As shown in FIGS. A cartridge support plate 14 is horizontally supported on the upper surface of the base 12 via a support member 13. A cartridge 15 is removably loaded onto the support plate 14. Cartridge 1
A rotating magnetic sheet 16 having flexibility is housed in the interior of the rotating magnetic sheet 5 . A hub 17 is provided at the center of the magnetic sheet 16, and when the cartridge 15 is loaded, the hub 17 is fitted onto a motor rotating shaft 18 protruding from the upper surface of the base 11.

On the other hand, a head moving mechanism 19 is installed on the base 12. This head moving mechanism 19 is provided so that the head support 21 is moved in the radial direction of the sheet 16 by rotating a head moving motor 20. Head support 2
1 is provided with a stabilizing plate 22 at the upper end thereof. The stabilizing plate 22 is located within an opening 15b formed in the cartridge support plate 14 and the back wall 15a of the cartridge 15, and is provided so that its upper end surface is substantially flush with the inner surface of the cartridge back wall 15a. ing. A head 23 is provided at the center of the stabilizer plate 22 so that its tip protrudes toward the inner surface of the stabilizer plate 22 by a certain amount.

FIG. 5 shows the head 23 in opposing contact with the recording surface of the rotating magnetic sheet 16. The head 23 is mounted so that its tip protrudes from the inner surface of the stabilizing plate 22, that is, the upper side F in the figure, by a predetermined distance M. This protrusion amount M is the magnetic sheet 16
It is determined by the shape of the head 23, etc., but is fixed so as not to change during use. The stabilizer plate 22 is made of metal or hard plastic. Note that it is desirable that the surface F facing the magnetic sheet 16 be chrome plated or the like so that it becomes a smooth surface. Furthermore, it is desirable that the upper surface F of the stabilizer plate 22 and the inner surface of the cartridge back wall 15a be on the same plane as described above, but as shown in FIG. The upper side of 22 is the cartridge back wall 15a.
There is no particular problem even if it protrudes somewhat upwards from the inner surface. However, it is necessary to have smooth corners at both ends in the sheet running direction indicated by arrows as shown in FIG. This means that in the initial state, the stabilizer plate 2
Even if the upper surface of the stabilizer plate 22 and the inner surface of the cartridge back wall 15a are accurately set to be on the same plane, the relative positional relationship between the stabilizer plate 22 and the cartridge back wall 15a may change over a long period of use. Since the angle may change, it is important to keep the corners of the stabilizer plate 22 smooth.

The device configured in this manner operates as follows. When the motor 11 is rotated, the rotating magnetic sheet 16 rotates smoothly with an air film formed between the inner surface of the cartridge back wall 15a and the upper surface of the stabilizer plate 22, as in the case described in the conventional example. Accordingly, predetermined information is recorded or reproduced on the tracks of the sheet 16 by the head 23 which is in opposing contact with the recording surface of the sheet. On the other hand, when the head moving motor 20 is rotated, the head support 21 in the head moving mechanism 19 moves in the radial direction of the seat, so that the head 23 moves together with the stabilizer plate 22, resulting in so-called track switching.

In the above operation, since the sheet 16 and the head 23 always maintain a stable contact state, good recording or reproduction can be performed. That is, in this device, the head 2 is placed around the magnetic head 23.
Since the stabilizing plate 22 whose relative position with respect to the head 3 is set to the optimum state in advance is attached integrally with the head 23,
Even if the relative position between the inner surface of the cartridge back wall 15a and the tip of the head is not maintained in an optimal state, the head 23 and the sheet 16 will maintain a stable contact state. In addition, head 23 and sheet 1
Since only the peripheral part of the head, which is the most important part in determining the state of contact with the cartridge 6, is supported by the high-precision stabilizing plate 22, the entire inner surface of the cartridge back wall 15a can be finished with high precision. It has the advantage that it can be manufactured at a much lower cost than the conventional method.

FIG. 6 shows another embodiment of the invention. This embodiment differs from the previous embodiment in that the stabilizer plate 32 is completely fixed, and only the head 33 is configured to move within a groove provided in the center of the stabilizer plate 32. Even in this case, the relative positional relationship between the stabilizer plate 32 and the head 33 can be set to a desired state much more easily than in the conventional case. In such a configuration, the stabilizer plate 32
Since the stabilizer plate 32 does not move, the size of the opening provided in the side wall of the cartridge can be reduced, and when the stabilizing plate 32 is movably provided, there is almost no unobstructed area of the opening, so the rotation of the sheet can be reduced. It has the advantage of being sufficiently smooth.

Note that the present invention is not limited to the embodiments described above, and it goes without saying that various modifications can be made without departing from the gist of the present invention.

As explained above, according to the present invention, the stabilizing plate provided integrally with the head around the head bears part of the action of the cartridge back wall, so the accuracy of the cartridge back wall itself does not need to be particularly increased. In addition, it is possible to provide a magnetic recording and reproducing device that can stably maintain the relative positional relationship between the head and the sheet in an optimal state and perform good recording and reproducing without making the cartridge side plate particularly strong.

[Brief explanation of the drawing]

Figure 1 is a sectional view showing the outline of a conventional device;
The figure is a cross-sectional view taken along the line A-A in Fig. 1, Fig. 3 is a top view of an embodiment of the present invention, Fig. 4 is a sectional view of the embodiment, and Fig. 5 shows the main parts of the embodiment. FIG. 6 is a cross-sectional view of a main part of another embodiment of the present invention. 11... Seat rotation motor, 12... Base,
13... Support member, 14... Cartridge support plate, 15... Cartridge, 15a... Cartridge side plate, 15b... Opening, 16... Rotating magnetic sheet, 17... Hub, 18... Motor rotating shaft,
19... Head moving mechanism, 20... Head moving motor, 21... Head support, 22, 32...
Stabilizer plate, 23, 33...magnetic head.

Claims (1)

[Scope of Claims] 1. A rotational drive mechanism, a cartridge loaded into the rotational drive mechanism, a rotating magnetic sheet stored in the cartridge and rotationally driven by the rotational drive mechanism, and a rotating magnetic sheet of the rotating magnetic sheet. an opening provided in the cartridge along the radial direction; a stabilizing plate having a separate structure from the cartridge and facing the rotating magnetic sheet surface inserted into the opening; and an inner surface of the stabilizing plate. a magnetic head that is integrally attached and is provided so that its tip protrudes from the surface of the stabilizer plate by a predetermined dimension so as to face the recording surface of the rotating magnetic sheet in the opening;
A head moving mechanism is provided for moving the magnetic head together with the stabilizing plate in the radial direction of the rotating magnetic sheet, and the stabilizing plate allows the rotating magnetic sheet to levitate while maintaining a constant space in the vicinity of the magnetic head. A magnetic recording/reproducing device characterized by having sufficient width, length, and surface accuracy. 2. A rotational drive mechanism, a cartridge loaded into the rotational drive mechanism, a rotating magnetic sheet stored in the cartridge and rotationally driven by the rotational drive mechanism, and a rotating magnetic sheet along the radial direction of the rotating magnetic sheet. an opening provided in the cartridge; a stabilizing plate having a separate structure from the cartridge and inserted into the opening and facing the surface of the rotating magnetic sheet; a magnetic head provided in the groove such that its tip protrudes from the surface of the stabilizer plate by a predetermined distance so as to face the recording surface of the rotating magnetic sheet in the opening; a head moving mechanism for moving the rotary magnetic sheet in the radial direction along the groove of the stabilizer plate, and the stabilizer plate is configured to allow the rotary sheet to float and travel while maintaining a constant space in the vicinity of the magnetic head. A magnetic recording/reproducing device characterized by having sufficient width, length, and surface accuracy.