JPH0330201B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic recording device for magnetically recording or reproducing various data on a disk-shaped record carrier, a so-called floppy disk drive device.

Generally, in this type of device, a disk-shaped record carrier is attached to a spindle connected to a drive motor using a chuck device, and a magnetic head (transducer) scans a recording track on this rotating record carrier to magnetically record the data. Or I'm trying to play it.

Therefore, if external magnetism influences the record carrier and magnetic head, it is natural that read and write errors will occur, and this external magnetic influence is the most problematic.

However, recently, devices have become smaller, and so-called direct drives, in which the spindle is directly connected to the rotating shaft of the drive motor, are susceptible to magnetic leakage from the drive motor, and due to the small and compact design of the device, external magnetic easily influenced by
Particularly when a plurality of devices of this kind are incorporated into equipment, errors may occur due to magnetic leakage from adjacent devices.

Conventionally, to solve this problem, the spindle for mounting the record carrier and the drive motor were separated from each other, or when multiple devices were incorporated into a device, it was necessary to prevent them from being affected by mutual magnetic leakage. I am considerate.

Therefore, there was a drawback that it was difficult to make the device smaller and more compact.

In addition, the miniaturization and compactness of the device brings about the disadvantage that the printed circuit board of the electrical processing circuit for recording and reproducing data with the magnetic head may malfunction due to the above-mentioned magnetic leakage.

In other words, there is a risk that an electromotive force may be generated due to leakage magnetism on the wiring of the printed circuit board, and an error signal may be generated.

In view of the above points, the present invention prevents the influence of leakage magnetism from the drive motor or external device from affecting the recording carrier, magnetic head, and printed wiring board, thereby making it possible to make the device smaller and more compact. The main purpose of this invention is to provide a magnetic recording device with a simple structure, which can be compactly designed using a direct drive system in which a drive motor rotates the spindle of a carrier, and which can provide reliable reading and writing.

The configuration will be described in detail below based on one embodiment shown in the drawings.

First, the present invention magnetically shields the recording carrier, magnetic head, and printed wiring board with a soft magnetic material having high magnetic permeability and low coercive force to prevent external magnetism from acting on them.

A frame plate 5 is constructed integrally with the left and right side frames 10 and 11, and the drive motor 1 is fixed to the back side (bottom side in FIG. 1) with screws 12. A center hole 13 is formed in this frame plate 5, and a spindle 2 faces from the center hole 13 to its front side (upper side in FIG. 1), and this spindle 2 is connected to a drive motor 1.
It is fixed to the rotating shaft 1' with screws 14.

A hub 15 and a clutch plate 16 are attached to the spindle 3 to a carrier 17, and the carrier 17 has a base end 17a supported by an appropriate frame (the one shown is a shield plate to be described later) so as to be able to swing freely, and a distal end thereof. The clutch plate 16 and the hub 15 are supported on the shaft 17b via a bearing 18,
The carrier 17 is moved by the operation lever 19 as shown in FIG.
When pressed down, the disk-shaped record carrier 3 is clamped and held between the hub 15 and the flange of the spindle 2. The operating lever 19 is adapted to operate in conjunction with the operation of inserting the record carrier 3 into the apparatus, for example, opening and closing the lid.

Then, insert the record carrier 3, push down the carrier 17 with the operating lever 19, clamp the center hole of the record carrier 3 between the hub 15 and the spindle 2, and rotate the drive motor 1. , hub 15, clutch plate 1
6 will rotate together.

The present invention provides a shield plate 7 opposite to the frame plate 5, and the frame plate 5 and the shield plate 7
The shield plate 7 and the frame plate 5 are made of a soft magnetic material, and a printed wiring board 8 is mounted on the shield plate 7.

In other words, the frame plate 5 has stepped portions 1 on the left and right side walls.
0', 11' are formed, and these stepped portions 10', 1
A shield plate 7 is disposed on the upper wall 1' so as to cover the entire recording carrier 3 except for the clutch plate 16 at the tip of the carrier 17 and the cutout hole 20 of the hub 15.

A printed wiring board 8 is mounted on this shield plate 7, and on this board 8, an ordinary amplifier for the magnetic head 4, a drive motor and other control circuits, an interface to an external controller, etc. are incorporated.

Next, the magnetic head 4 will be explained. The magnetic head 4 is assembled into a carriage 21, fitted and supported by a guide shaft 22 so that the carriage 21 reciprocates in the direction of the rotation center of the recording carrier 3, and is connected to a stepping motor 23. They are linked by a steel belt 24. And this stepping motor 23
The carriage 21 is configured to advance in accordance with the rotation of the record carrier 3 so that the magnetic head 4 tracks the recording track on the record carrier 3 under rotational control.

In the present invention, the frame plate 5 and the shield plate 7 are made of a soft magnetic material, and the magnetic force coercive by the frame plate 5 and the shield plate 7 causes the recording carrier 3, This is because the magnetic head 4 and the printed wiring board 8 must not be affected, and various materials can be used as long as the magnetic head 4 and the printed wiring board 8 are not affected. However, hard magnetic materials such as alkoni-based and cobalt-based magnet alloys or quench-hardened carbon steel are not suitable.

Next, to explain its function, the drive motor 1,
Against magnetic leakage from the stepping motor 23 of the carriage 21 or an external device,
Record carrier 3, magnetic head 4, printed wiring board 8
is protected as shown in Figure 3.

First, the recording carrier 3 and the magnetic head 4 disposed in sliding contact with the recording carrier 3 have a frame plate 5 and a shield plate 7, and leakage magnetism from the drive motor 1, for example, is influenced by the magnetic field lines forming a loop as shown in FIG. is not applied to the record carrier 3 and the magnetic head 4. Similarly, there is no possibility that a loop of magnetic lines of force as shown in the figure may be drawn on the printed wiring board 8 and cause malfunction due to its influence.

Similarly, external leakage magnetism from sources other than the drive motor 1 does not affect the recording carrier 3, magnetic head 4, or printed wiring board 8.

The present invention consists of the above-mentioned configuration, and has a drive motor 1.
A frame plate 5 is made of a soft magnetic material and has a spindle 2 arranged on the back side and a spindle 2 on the front side, and a shield plate facing the front side of the frame plate 5 and forming a storage part 6 for the disk-shaped record carrier 3. 7
is made of a soft magnetic material, and a printed wiring board 8 is attached to the surface of this shield plate 7, so that the recording carrier 3 such as a floppy disk, for example,
The magnetic head 4 and the printed wiring board 8 are magnetically protected by soft magnetic plates of the frame plate 5 and the shield plate 6, and read errors or errors occur in the record carrier 3 and the magnetic head 4 due to the influence of external magnetic leakage from the drive motor 1 and other sources. There is no risk of causing a write error, and there is no risk of electromotive force generated by the magnetic field in the wiring on the printed wiring board 8 and causing a protection operation. Therefore, the drive motor and other excited parts, devices, etc. can be designed to be small and compact in terms of space.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a side view, FIG. 2 is a plan view, and FIG. 3 is an explanatory view of the main parts. DESCRIPTION OF SYMBOLS 1... Drive motor, 2... Spindle, 3... Record carrier, 4... Magnetic head, 5... Frame plate, 6... Storage part for record carrier, 7... Shield plate, 8... Printed wiring board.

Claims (1)

[Claims] 1. In a magnetic recording device, a disk-shaped record carrier 3 is mounted and rotated on a spindle 2 connected to a drive motor 1, and a recording track on the record carrier 3 is scanned by a magnetic head 4 to record and reproduce data. The motor 1 includes a frame plate 5 on which the spindles 2 are disposed on the front side thereof, which is made of a soft magnetic material, and a shield plate facing the front side of the frame plate 5 and forming the housing portion 6 for the record carrier 3. 7 is made of a soft magnetic material, and a printed wiring board 8 is attached to the surface of the shield plate 7.