JPH0271453A - Recording and reproducing device - Google Patents

Abstract

PURPOSE:To miniaturize the device, to decrease the number of parts and to reduce cost by making common a magnet to attract a recording medium to a rotary member and a magnet for a driving motor to rotate the rotary member. CONSTITUTION:A hole part 32 of a rotor yoke 15 and a hole part 31 of a spindle 13 are arranged so as to expose only the N pole a rotor magnet 6. Consequently, a magnetic flux emitted from N pole of the rotor magnet 6 leaks upwards through the hole parts 31 and 32 and reaches a yoke 17, a center hub 21 to support a magnetic recording medium 18 is catched by a spindle 13, when an index pin 22 passes under a magnetic sensor 24, a rotational phase signal of the same polarity can be detected from the magnetic sensor 24. By making common the magnet 6 for the attraction of a floppy disk and the rotation of a spindle like this, the number of parts is decreased, the manufacturing cost can be reduced and the device can be miniaturized.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a recording/reproducing apparatus, and particularly to a recording/reproducing apparatus that records and/or reproduces information on a rotationally driven recording medium.

[Prior Art] Optical disk devices and magnetic disk devices are known as recording and reproducing devices that record and reproduce information on and from a rotationally driven recording medium. This type of device is widely used as an external storage device for computers, word processors, and the like.

FIG. 4 shows an example of a conventional recording/reproducing device of this type.
It shows the structure of a floppy disk drive.

The reference numeral 10 in FIG. 4 is the chassis of the apparatus, and a shirt 11 is fixed to the chassis 10. The shaft 11 is installed perpendicularly to the chassis 10 so that its upper end contacts the center of rotation of the floppy disk. Further, a cap 1 is attached to the upper end of the shirt 11 that contacts the floppy disk. The cap 1 is a member for extending the disc, has a conical cross section as shown, and is installed on the shaft 11 so as to be freely rotatable.

The reference numeral 3 in the figure is a spindle that comes into contact with a floppy disk, which is a recording medium, and attracts the floppy disk. The spindle 3 is rotatably supported on the shaft 11 via two upper and lower bearings 2.2. Further, the spindle 3 is urged upward by a preload spring 12 so as to surely contact the floppy disk.

The spindle 3 consists of a cylindrical portion 3a that rotates around a shaft 11, and a disk-shaped portion 3b provided above the cylindrical portion 3a.A flange 3C with which a floppy disk comes into contact is formed on the upper surface of the disk-shaped portion 3b. A chucking magnet 4 for adsorbing the Flow 7B disk is installed inside the flange 3C. The chucking magnet 4 is also used to detect the rotational phase of the disk. For this purpose, it is assumed that the chucking magnet 4 is magnetized so that the upper surface side is magnetized to the north pole and the lower surface side is magnetized to the south pole.

A rotor yoke 5 is fixed to the lower surface of the disc-shaped portion 3b of the spindle 3. The rotor yoke 5 is an annular disk, and the hole in the center is the cylindrical portion 3a of the spindle 3 described above.
The mating is fixed.

A rotor magnet 6 for rotating the spindle 3 is provided on the lower surface of the rotor yoke 5. The rotor magnet 6 is an annular disk-shaped magnet, and the third
As shown in the figure, it is polarized in the circumferential direction.

In FIG. 4, the lower part of the cylindrical portion 3a of the spindle 30 includes:
A sub rotor yoke 9 is provided, and a spindle 3. It is magnetically coupled to a rotor magnet 6 via a rotor yoke 5. The sub rotor yoke 9 is an annular disk member similar to the rotor yoke 5, and the rotor yoke 5
A plurality of drive coils 7 are provided on a circuit board 8 which is installed parallel to the circuit board 8 and is thereby floatingly supported on the chassis 10.
are arranged so that the magnetic circuit is sandwiched between them.

FIGS. 2A and 2B are a top view and a sectional view of a floppy disk, which is a recording medium.

Here, the structure of a well-known 2-inch disk is shown.

In both figures, the reference numeral 18 indicates a disk-shaped magnetic recording medium coated with a magnetic material. At the center of the magnetic recording medium 18, a center hub 21 made of plastic or the like is provided. The center hub 21 has a trapezoidal hole 21a in the center, and a leaf spring 21 integrally formed on one side of the trapezoidal hole 21a.
The plate spring portion 21b presses the slope of the cap 1 against the oblique side of the hole 21a, thereby centering the disk.

Further, a yoke 17 is fixed to the lower surface of the center hub 21. The yoke 17 is made of metal such as iron so as to be attracted to the chucking magnet 4 installed on the spindle 3.

The cassette 19 is made of plastic or the like, and the magnetic recording medium 18 is placed inside the cassette 19 so that the recording surface is not exposed to the outside. Also, on the surface of the cassette 19, there is a shutter 2 that opens and closes when the cassette 19 is attached to and removed from the device.
0 is set.

When a disk is inserted into a floppy disk drive device, the shutter 20 is opened by a mechanism (not shown) using the force at the time of insertion, and the recording surface of the magnetic recording medium 18 is exposed to the outside and can be accessed by a magnetic disk (not shown). Ru.

Further, as shown in FIG. 2(B), an index bin 22 is vertically penetrated at a predetermined position on the radius of the center hub 21 and is magnetically coupled to the yoke 17. This pin 22 is exposed on the upper surface side of the cassette as shown in FIG. 2(A). This index pin 22 is the yoke 1
It is magnetized with a predetermined polarity by the chucking magnet 4 via the chucking magnet 7, and the rotational phase is detected by detecting its position with a magnetic pickup.

Next, the flow shown in FIG. 4 and the operation of the disk drive will be explained.

First, a floppy disk is inserted into the insertion slot of a floppy disk drive (not shown). At this time, the shutter 20 of the floppy disk is opened by a device (not shown), and the magnetic recording medium 18 of the floppy disk is exposed to the outside.Then, the spindle 3 is attached to the yoke 17 of the floppy disk by a force such as a spring (not shown) or manually.
contact. Then the floppy disk yoke ■7
is attracted to the spindle 3 by a chucking magnet 4 installed on the spindle 3.

Next, a current is applied to the drive coil 7. At this time, the drive coil 7
A current controlled by the circuit board 8 is passed through the drive coil 7 so that the polarity of the spindle 3 is alternately switched, and the spindle 3 rotates together with the attracted floppy disk on the same principle as a general DC motor.

Thereafter, a recording/reproducing head (not shown) is brought into contact with the rotating magnetic recording medium 18 through the opening of the shutter 20 to record and reproduce information.

When the magnetic recording medium 18 is rotationally driven, a magnetic sensor 24 consisting of a yoke 25 and a coil 26 is arranged at an upper position of the center hub 21 corresponding to the index bin 22 of the center hub 21, as shown in FIG. When the index pin 22 passes under the magnetic sensor 24, a magnetic path is formed as shown by the broken line, so that an electric signal of a predetermined polarity is obtained from the coil 26 of the magnetic sensor 24.

As mentioned above, since the upper side of the chucking magnet 4 has the north pole, the direction of the magnetic flux indicated by the broken line is always clockwise in the figure, and the rotational phase signal obtained from the coil 26 is always of the same polarity. In this way index pin 22
By determining the polarity of m, the phase of the rotational phase signal is unified in all devices, and compatibility of recording and reproduction is guaranteed.

[Problems to be solved by the invention] In the conventional example described above, in addition to the rotor magnet for rotating the disk drive, a chucking magnet for attracting the yoke of the floppy disk is required, and many members of the same type are required. However, there are disadvantages in that the cost increases or the device becomes larger. However, as described above, the chucking magnet also has the function of generating magnetic force for detecting the rotational phase, so there is a problem in that it cannot be simply removed and a different chucking mechanism adopted.

The object of the invention is to solve the above-mentioned problem.

[Means for Solving the Problems] In order to solve the above problems, the present invention provides a recording and reproducing apparatus that records and reproduces information on a rotationally driven recording medium based on a predetermined information recording and reproducing method. a rotating member that contacts a predetermined portion of the recording medium to rotate the recording medium; a drive motor that includes a built-in rotor magnet; and a drive motor that rotates the recording medium at the predetermined portion of the recording medium using the magnetic force of the rotor magnet that is built into the drive motor. A configuration is adopted in which a means for attracting the recording medium to the rotating member is provided, and the recording medium is rotationally driven by a driving motor via the rotating member.

[Operation] According to the above configuration, the recording medium can be attracted to the rotating member using the magnetic force of the motor for rotationally driving the recording medium.

[Example] Hereinafter, the present invention will be described in detail based on the example shown in the drawings. Hereinafter, the same reference numerals will be used for the same or corresponding members as in the conventional apparatus shown in FIG. 4, and detailed explanation thereof will be omitted. Furthermore, the floppy disk shown in FIG. 2 is used as is.

FIG. 1 shows the structure of a floppy disk drive employing the present invention. Figure 1 is a diagram corresponding to Figure 4,
The difference from FIG. 4 is that the chucking magnet 4 inside the flange 3c of the spindle 13 is omitted, and the holes 31.3 in the spindle 13 and rotor yoke 15 are
2 are provided respectively. The structure of this part is shown in FIG.

The rotor magnet 6 is circumferentially polarized (8 poles) as shown in the figure.A rotor yoke 15 is fixed to the upper surface of the rotor magnet 6.
A hole 32 is cut out at the edge of the center hole. The hole 32 is arranged so that only the north pole of the rotor magnet 6 is exposed through the hole 32 when the rotor yoke 15 is fixed to the rotor magnet 6.

On the other hand, the spindle 13 is composed of a cylindrical part 13a that rotates around the shaft 11, like the spindle 3 in FIG. 4, and a disc-shaped part 13b provided on the upper part. A flange 13c that contacts is provided. Also spindle 13
A hole 31 is provided in the disk-shaped portion 13b at the same position as the rotor yoke 14.

The aforementioned rotor yoke 14 and rotor magnet 6 are fitted and fixed into the cylindrical portion 13a of the spindle 13. At this time, the rotor yoke 14 and the rotor magnet 6 are connected so that the hole 32 of the rotor yoke 14 is connected to the spindle 1.
3 so as to overlap with the hole 31 of No. 3.

Thereby, the structure is such that the N pole of the magnetic pole of the rotor magnet 6 is exposed on the upper surface of the disk-shaped portion 13b.

Next, the operation of the apparatus shown in FIG. 1 will be explained.

The floppy disk loading method is the same as before, but
At that time, the spindle 1 is attached to the yoke 17 of the floppy disk.
3, the N pole of the rotor magnet 6 is exposed on the upper surface of the disc-shaped portion 13b of the spindle 13, so the N pole of the rotor magnet 6 and the yoke 17 are brought into contact with the hole 31.
, 32.

The magnetic flux emitted from the N pole of the rotor magnet 6 is
1.32, reaches the yoke 17, passes through the yoke 17, passes through the flange 13c of the spindle 13, and heads toward the S pole of the rotor magnet 6 (broken line A).
As a result, the yoke 17, and therefore the center hub 21 that supports the magnetic recording medium 18, is attached to the spindle 13 with the char 2.
King.

The rotational drive of the disk is the same as the conventional one, and by controlling the excitation of the coil 7 in a predetermined pattern, the yoke 17 is rotationally driven while being coupled to the spindle 13 by the above-mentioned chucking action.The detection of the 0 rotation phase is as follows. It is done like this.

A magnetic sensor 24 is fixed on the upper surface of the spindle 13 as shown in FIG. The yoke 17 leaks upward through the holes 31 and 32, and the yoke 17 connects to the index pin 22.
through.

Passing through the yoke 25 of the magnetic sensor 24, the rotor yoke 1
5 to the S pole of the rotor magnet 6 (
Broken line B).

Therefore, the direction of the magnetic flux with respect to the magnetic sensor 24 is the same as in the conventional example, and rotational phase signals of the same polarity can be detected from the magnetic sensor 24 as in the conventional example.

According to the present embodiment described above, the chucking magnet for attracting the floppy disk and the rotor magnet for rotating the spindle can be shared, so the number of parts can be reduced and manufacturing costs can be reduced. , it is possible to downsize the spindle part.

In addition, as mentioned above, since the yoke for chucking on the disk side can be magnetized with the same polarity as before, the polarity of the rotational phase signal can be made the same, ensuring compatibility in recording and reproduction. can.

The above example uses a 2-inch floppy disk, but the chucking method of the present invention also applies to magnetic disks,
Needless to say, the present invention can be applied to various recording and reproducing devices using optical discs and the like.

[Effects of the Invention] As is clear from the above, according to the present invention, in a recording and reproducing apparatus that records and reproduces information on a rotationally driven recording medium based on a predetermined information recording and reproducing method, a rotating member that contacts the part and rotates the recording medium;
A drive motor having a built-in rotor magnet, and a means for attracting a predetermined portion of the recording medium to the rotating member using the magnetic force of the rotor magnet built in the drive motor, and driving the recording medium via the rotating member. Since a configuration is adopted in which the recording medium is rotationally driven by a motor, the magnet for attracting the recording medium to the rotating member and the magnet for the drive motor for rotating the rotating member can be used in common. This has the effect of making the device smaller. Furthermore, since the number of parts can be reduced, costs can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of the recording/reproducing apparatus according to the present invention, FIGS. 2(A) and 2(B) are a top view and a sectional view of a floppy disk, and FIG. 3 is a schematic diagram of the apparatus shown in FIG. 1. FIG. 4 is a sectional view of a recording/reproducing apparatus according to the prior art. l... Cap 13... Spindle 5.
14... Rotor yoke 6... Rotor magnet 17... Center hub 18... Magnetic recording medium 22... Index pin 24... Magnetic sensor 31. 32... Hole

Claims (1)

[Claims] 1) In a recording and reproducing apparatus that records and reproduces information on a rotationally driven recording medium based on a predetermined information recording and reproducing method, a rotation that contacts a predetermined portion of the recording medium and rotates the recording medium. a drive motor having a built-in rotor magnet; and a means for attracting a predetermined portion of the recording medium to the rotary member using the magnetic force of the rotor magnet built into the drive motor; A recording/reproducing device characterized in that a recording medium is rotationally driven by a drive motor via the drive motor. 2) By setting the magnetic flux between the rotor magnet and the recording medium side in a predetermined direction, a predetermined portion of the recording medium is magnetized with a predetermined polarity and magnetically coupled to the predetermined portion. 2. The recording/reproducing apparatus according to claim 1, wherein a rotational phase signal of the recording medium is detected from a magnetic sensor.