JPH0321979B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a device for writing necessary signals to a predetermined writing position of a disk type recording medium.
In particular, the present invention relates to a device in which a signal can be written in a position that exactly coincides with the predetermined writing position.

[Conventional technology]

During the manufacture of floppy disk drive devices, the reference disk used to adjust the tracking (radial) and index (circumferential) and azimuthal positions of the read/write heads has, by its very nature, It is required that a predetermined signal be written at a position on the disk surface that exactly coincides with each predetermined writing position. To create such a reference disk, for a 5-inch or 8-inch floppy disk, a read/write head writes a signal on one disk surface of the disk that is attached to the spindle and driven to rotate. After that, the disk is turned over, attached to the spindle and driven to rotate,
As a result, signals were written to the other disk surface using the same head. On the other hand, in the case of 3.5-inch floppy discs, which cannot normally be installed upside down because a chucking hub is attached to the disc itself, it is now possible to install the disc upside down using a chucking adapter. ,5
Writing can be done in the same manner as for inch or 8 inch disks, or by providing a separate head for each disk surface, the disks can be written on separately while mounted on the spindle in the chucking direction. One of two methods was used: writing to each disk surface using a head.

[Problem that the invention seeks to solve]

However, when the disk is attached to the spindle through an adapter, the tracking accuracy deteriorates, and eccentricity often occurs between the rotation of the spindle and the rotation of the disk. Furthermore, when separate heads are used, work is required to ensure compatibility between the two heads, and in some cases, compatibility cannot be fully guaranteed. For this reason, with respect to 3.5-inch floppy disks, it is difficult to write signals at positions that exactly match the predetermined writing positions on both disk surfaces, and it is therefore difficult to create a highly reliable reference disk. The problem was that it was difficult.

Although undisclosed at the time of filing of the present invention, a disk-type recording medium drive device to solve this problem is capable of spinning a 3.5-inch floppy disk according to the chucking direction by reversing the entire spindle part. The present applicant has already filed a patent application for a device in which signals can be written on both disk surfaces using the same read/write head while the disk is attached to the disk. In other words, this drive device includes a rotating shaft for reversing that is supported by a fixed frame in a position perpendicular to the rotating shaft of the spindle part, one end of which is attached to the rotating shaft for reversing and rotates together with the rotating shaft, It is equipped with a spindle support part that supports the spindle part at the end, and a reversing drive means for giving rotational motion to this reversing rotating shaft. By rotating the disk 180 degrees around the rotation axis (i.e., inverting it) while it is still attached, the disk is turned upside down relative to the read/write head before and after inversion, and Therefore, signals can be written on both disk surfaces using the same read/write head while the disk is mounted on the spindle.

By the way, in this method of inverting the entire spindle part, the position of the spindle part on the plane perpendicular to the rotation axis of the spindle part (that is, on the plane parallel to the disk surface of the disk mounted thereon) is If there is a discrepancy between the position of the disk before and after reversal, there will be a discrepancy in the position of the disk on the plane before and after reversal, so the position of the disc on the plane will be different from the same feeding position (i.e. reference position) before and after reversal. Even if the read/write head is extended, it is impossible to write a signal on both disk surfaces at a position exactly coinciding with a predetermined write position. That is, in such a system, the accuracy of the reversing mechanism consisting of the reversing rotating shaft, spindle support, etc. directly affects the accuracy of the signal writing position.
Therefore, in this type of system, it is required to use a highly accurate reversing mechanism, but in reality, the accuracy of the reversing mechanism may deteriorate due to problems with the machining accuracy of parts or wear of parts during use. There is a limit to this, and as a result, there are many cases in which the position of the spindle portion deviates as described above. Therefore, even if such a disk-type recording medium drive device is used, the 3.5-inch floppy drive
There were cases in which it was not possible to create a highly reliable standard disk.

This invention was made in view of the above points,
For disks with a tracking hub attached to the disk itself, such as a 3.5-inch floppy disk, a drive for a disk-type recording medium that allows signals to be written at positions that exactly match the predetermined writing positions on both disk surfaces at all times. The aim is to provide equipment.

[Means for solving problems]

A disk-type recording medium drive device according to the present invention employs a method of inverting the entire spindle portion as described above, in which the spindle portion is rotated on a plane perpendicular to the rotation axis of the spindle portion. The present invention is characterized in that a spindle part position measuring means is provided for determining position information at least before and after the spindle part is reversed.

[Effect]

The spindle position measuring means determines position information of the spindle before the reversal and position information of the spindle after the reversal, respectively. This makes it possible to detect the positional deviation of the spindle portion before and after reversal, and to perform necessary control in response to this deviation in the disk type recording medium drive device. For example, the extended position (reference position) of the read/write head before the spindle is reversed and the extended position (reference position) of the read/write head after the spindle is reversed are determined based on these positional information. By setting this, it is possible to correct the extended position of the read/write head in accordance with the deviation of the spindle section. This makes it possible to write a signal at a position that exactly coincides with a predetermined write position on both disk surfaces of the disk mounted thereon, regardless of the positional deviation of the spindle.

〔Example〕

Hereinafter, one embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 shows an apparatus employing an embodiment of the disk-type recording medium drive apparatus according to the present invention. This device creates a reference disk for adjusting the read/write head during the manufacture of a floppy disk drive device for a 3.5-inch floppy disk in which the tracking hub is attached to the disk itself.

In this device, a frame 2 is fixedly provided on a base 1, and the frame 2 has both ends facing in the horizontal direction (direction of arrow H in the figure).
A rotation shaft 3 for reversal is supported by protruding from the shaft. One end of a substantially L-shaped spindle support portion 4 is fixedly attached to the rotation shaft 3 for reversal. The spindle support part 4 rotates around the rotating shaft 3 together with the rotating shaft 3 for reversal. A frame 6 of the spindle part 5 is fixedly supported at the tip of the spindle support part 4. The spindle portion 5 rotates around the reversal rotation shaft 3 together with the spindle support portion 4 (and therefore together with the reversal rotation shaft 3). This spindle portion 5 is used to removably mount the floppy disk 7, which is the 3.5-inch type floppy disk mentioned above, and to rotate it. A rotating shaft 8 for rotating the disk 7, a motor 9 for driving the rotating shaft 8, and other parts of the spindle section 5 are attached to a frame 6 and supported by a support section 4. Spindle support part 4
supports the spindle portion 5 in such a manner that the extension line of the rotation shaft 8 of the spindle portion 5 supported at its tip is perpendicular to the extension line of the rotation shaft 3 for reversal. Insert the reversing rotation shaft 3 from the position shown in Figure 1.
When rotated 180 degrees, the spindle part 5 moves to the disk 7.
It is turned over to the position shown in Fig. 3 with the machine still mounted. The center of rotation of the rotating shaft 3 and the height of the disk 7 in the spindle portion 5 in FIG. The disk 7 is inverted about the central axis, and although the disk 7 is located in the same space before and after the inversion, only the disk surface is inverted.

An example of a driving means for rotating the rotation shaft 3 for reversal is shown in FIG. 2. frame 2
In this case, the rotating shaft is oriented horizontally in the same way as the rotating shaft 3 for reversing, and one end is placed on the same side as the end of the rotating shaft 3 for reversing on which the spindle support part 4 is not attached. A rotary actuator 17 is provided to protrude. Pulleys 18 and 19 are attached to the end of the reversing rotating shaft 3 and the end of the rotary actuator 17, respectively, and the pulleys 18 and 19 are connected by a belt 20. As a result, when the rotary actuator 17 rotates, the pulley 18 and the belt 2
0, the rotation shaft 3 for reversal rotates via the pulley 19. In addition, in Fig. 1, the rotary actuator 1
The illustrations of belts 7 to 20 are omitted.

On the base 1, on the side of the spindle part 5,
An XY table 10 is provided. The XY table 10 moves the Y table 10a along the arrow Y in FIG.
It includes an X table 10b that moves in the direction indicated by the arrow X in FIG. 2, and a carriage 10c that moves on the X table 10b in the direction indicated by the arrow X in FIG. The carriage 10c includes a read/write head 11 and sensors 12, 13.
is supported. The XY table 10 serves to move the head 11 and sensors 12, 13 in the X direction and Y direction in FIG. 2, respectively. The position of the carriage 10c in the X direction and the Y direction is measured by the length measuring device 14.

The read/write head 11 receives a signal for creating a reference disk from a signal generator (not shown).
This is for writing on the disk 7 mounted on the spindle section 5. The sensors 12 and 13 generate predetermined signals S1 and S2, respectively, when they come into contact with an object, and the height of each sensor is the same as the height of the disk 7 attached to the spindle part 5 in the state shown in FIG. It is set to be. sensor 12,1
3 plays the role of generating the signals S1 and S2 by coming into contact with the rotating shaft 8 of the spindle section 5 when the disk 7 is not mounted on the spindle section 5.
As shown in FIG. 2, a spring 15 is installed between the sensors 12, 13 and the carriage 10c to provide a buffer when they come into contact.

Signals S1 and S2 generated from sensors 12 and 13
is applied to the control input C of the position detection circuit 16. The position detection circuit 16 is sequentially supplied with data D _X indicating the position of the carriage 10c in the X direction and data D _Y indicating the position in the Y direction from the length measuring device 14. The position detection circuit 16 detects the data _D
data indicating the current position in the X direction) is captured and stored. Further, the position detection circuit 16 is
When the sensor 13 comes into contact with the rotating shaft 8 of the spindle section 5 and the signal S2 is given to the control input C, the data D _Y given from the length measuring device 14 (that is, the current position of the carriage 10c in the Y direction) is sent to the control input C. data) is captured and stored.

An example of the operation of creating a reference disk using this device is as follows. When the spindle support part 4 is in the position shown in FIG.
When the disk 7 is not yet installed, move the X table 10b on the Y table 10a so that the sensor 12 is located on the extension of the rotation center of the reversing rotation shaft 3, and then move the carriage 10
By moving c on the X table 10b, the sensor 12 is brought into contact with the rotating shaft 8 of the spindle section 5, as shown in FIG. Then, a signal S1 is generated from the sensor 12, and this signal S1 is applied to the control input C of the position detection circuit 16, so that the position of the carriage 10c when the sensor 12 contacts the rotating shaft 8 of the spindle section 5 before reversal Data D _X1 indicating the position in the X direction is stored in the position detection circuit 16. Next, the carriage 10c is moved on the X table 10b so that the sensor 13 is located on a line that is perpendicular to the extension line of the rotation center of the reversing rotation axis 3 and passes through the rotation axis 8 of the spindle section 5, and then By moving the table 10b on the Y table 10a, the sensor 13 is brought into contact with the rotating shaft 8 of the spindle section 5, as shown in FIG. Then, a signal S2 is generated from the sensor 13, and this signal S2 is the control input C of the position detection circuit 16.
data indicating the position of the carriage 10c in the Y direction when the sensor 13 contacts the rotating shaft 8 of the spindle section 5 before reversal.
D _Y1 is stored in the position detection circuit 16.

Subsequently, the X table 10b and the carriage 10
After the head 11 and the sensors 12 and 13 are separated from the spindle part 5 by moving the respective parts c, the third
As shown in the figure (however, unlike FIG. 3, the disk 7 is not yet attached to the spindle section 5 at this time), the spindle section 5 is inverted.

And again the X table 10b and the carriage 1
By moving 0c, the sensors 12 and 13 are brought into contact with the rotating shaft 8 of the spindle section 5 in the same manner as shown in FIGS. sensor 12,
Data D _X2 indicating the position of the carriage 10c in the X direction and the Y direction when the carriage 10c makes contact with the
D _Y2 is stored in the position detection circuit 16, respectively.

Next, for example, after returning the spindle section 5 to the state before inversion as shown in FIG. 1, the disk 7 is mounted on the spindle section 5 in the chucking direction. And X table 10b and carriage 1
0c to position the head 11 at a predetermined feeding position (reference position) A, and then by moving the carriage 10c, one disk surface of the disk 7 is moved by the head 11 as shown in FIG. A signal for creating a reference disk is written by the head 11 at a predetermined writing position on the disk surface.

Next, with the disk 7 attached, the spindle section 5 is turned over as shown in FIG. 3 in the same manner as described above. Next, the X table 10b and the carriage 10c
By moving the position detection circuit 1,
The difference between data D _X2 and D _X1 stored in the position detection circuit _{16 is △} D
A position A' shifted in the Y direction from the position A by D _Y is set as the feeding position (reference position) of the head 11. Then, by moving the carriage 10c from this position A', the remaining disk surface of the turned over disk 7 is sought by the head 11, and a signal for creating a reference disk is sent by the head 11 to a predetermined writing position on the disk surface. Write.

Here, the carriage 10 when the sensors 12 and 13 contact the rotating shaft 8 of the spindle section 5 before reversal
Data indicating the position of c in the X direction and Y direction
_{D _}
△ _{D X and △D Y , which are} the differences between D In addition, it shows nothing but the positional deviation in the X direction and the Y direction before and after the disk 7 mounted thereon is turned over, respectively. Therefore, by correcting the feeding position of the head 11 after the spindle part 5 is reversed with respect to the feeding position of the head 11 before the spindle part 5 is reversed by this amount, the positional deviation of the spindle part can be corrected. It is possible to write a signal on both surfaces of the disk 7 at a position that exactly coincides with a predetermined writing position regardless of the difference, and it is possible to create a highly reliable reference disk based on this.

In this embodiment, a 3.5-inch floppy disk having a structure in which a tracking hub is attached to the disk itself is shown as an example, but the drive device according to the present invention can of course be applied to other disk-type recording media. It's okay.

Further, in this embodiment, the drive device according to the present invention is employed in the device for creating the reference disk, but other appropriate devices (in particular, the drive device for writing signals at a position that exactly coincides with a predetermined writing position) may also be used. This drive device may be used in applications where head compatibility is a problem, etc.).

〔Effect of the invention〕

As described above, according to the drive device for a disk-type recording medium according to the present invention, the entire spindle section is reversed, so that the disk-type recording medium can be read and written by the same read/write head while it is attached to the spindle section. Signals can be written to each disk surface. In addition, since the positional information of the spindle part on the plane perpendicular to the rotation axis of the spindle part is obtained before and after reversal, control is performed according to the deviation in the position of the spindle part before and after reversal. (for example, the reference position of the read/write head can be corrected according to this deviation), and thereby the disk-type recording medium mounted thereon can be adjusted regardless of the deviation in the position of the spindle part. Signals can be written on both disk surfaces at positions that exactly match predetermined writing positions.

Therefore, even for disk-type recording media that have a tracking hub attached to the disk itself, such as a 3.5-inch floppy disk, it is possible to send signals to positions that exactly match predetermined writing positions on both disk surfaces. can be written,
Based on this, it becomes possible to create a highly reliable reference disk.

[Brief explanation of the drawing]

FIG. 1 is a side view showing an embodiment of a disk-type recording medium drive device according to the present invention, FIG. 2 is a top view of the same embodiment, and FIG. 3 is a state in which the spindle portion of the embodiment is reversed. FIGS. 4 and 5 are side views showing the same embodiment, and top views showing the state in which the sensor is in contact with the rotating shaft of the spindle, respectively.
FIG. 6 is a top view showing a state in which a read/write head is writing signals to a floppy disk mounted on the spindle in the same embodiment. DESCRIPTION OF SYMBOLS 1... Base, 2... Frame, 3... Rotating shaft for reversal, 4... Spindle support part, 5... Spindle part, 6... Frame, 7... Floppy disk, 8... Rotating shaft, 9...Motor, 10...XY
Table, 10a...Y Table, 10b...X
Table, 10c... Carriage, 11... Reading/writing head, 12, 13... Sensor, 14...
Length measuring device, 15...Spring, 16...Position detection circuit, 17...Rotary actuator, 18,
19...Pulley, 20...Belt.

Claims (1)

[Scope of Claims] 1. A spindle portion for removably mounting a disk-type recording medium and rotationally driving the disk-type recording medium, and a fixed frame arranged perpendicularly to the rotation axis of the spindle portion. a rotating shaft for reversing that is supported by a bearing; a spindle support portion having one end attached to the rotating shaft for reversing and rotating together with the rotating shaft and supporting the spindle portion at the other end; In order to perform reversal around the reversal rotation axis,
a reversing drive means for imparting a rotational motion to the reversing rotation shaft; and a reversing drive means that is independent of the reversing movement of the spindle section by the reversing drive means, and that is independent of the reversing motion of the spindle section, and before the spindle section is reversed, a disk mounted on the spindle section. a writing or reading head that is accessible to one side of the disk-type recording medium and, after reversal of the spindle unit, accessible to the opposite side of the disk-type recording medium mounted on the spindle unit; a spindle part position measuring means for obtaining information indicating the position of the spindle part on a plane perpendicular to the rotational axis of the spindle part, at least before and after the spindle part is reversed; Depending on the measured discrepancy between the positional information of the spindle before and after reversal, no matter which side of the disk-type recording medium the head accesses, the head accesses the disk-type recording medium. A drive device for a disk type recording medium, comprising: control means for positioning and controlling the head so that the head is set at a predetermined reference position with respect to the head. 2. The spindle position measuring means includes a sensor that generates a predetermined signal when it comes into contact with an object, supports the sensor, transports the sensor on a plane perpendicular to the rotation axis of the spindle, and moves the sensor to the spindle. a conveyance drive means for contacting the spindle portion; a length measuring device for measuring the position of the conveyance drive means on a plane perpendicular to the rotational axis of the spindle portion; and the signal is generated from the sensor. 2. A drive device for a disk type recording medium according to claim 1, further comprising a storage means for storing measurement data of said length measuring device.