JPH1173706A - Disk drive device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable the proper chucking even when the frictional torque from a lifter, etc., is decreased at the time of chucking operation, by increasing the rotational friction force in the manner of adding the friction force to a floppy disk. SOLUTION: When a disk cartridge 100 is loaded and positioned, a capacity discriminating hole of the disk cartridge 100 is detected by a detection means 5, therefore, e.g. the high density recording floppy disk having no lifter for abutting liners 105 on the signal recording surface in the cartridge is discriminated. At the time of chucking operation, a pressurizing means 2 is controlled by a control circuit 4, and the outside surface 104a of the cartridge 104 is pressurized by a driver 2a to increase the contact pressure of the liners 105 against the signal recording surface of the floppy disk 101. In this state, a disk table 41 is rotated to generate the rotational friction force required for the chucking operation. At the time of the recording/reproducing operation, the pressurization effected by the pressurizing means 2 is released.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk drive device for recording or reproducing information signals while rotating a disk-shaped recording medium chucked on a disk table.

[0002]

2. Description of the Related Art In recent years, floppy disks have been developed.
Attention has been focused on high-density recording of information such as k), and for example, large-capacity floppy disks exceeding several tens of MB have been proposed.

A floppy disk is usually housed in a thin box-shaped cartridge, and is mounted on a floppy disk drive (hereinafter referred to as an FDD) while being housed in the cartridge, and a magnetic disk provided in the FDD. Recording or reproduction of an information signal is performed by the head. Specifically, recording and reproduction by the FDD device are performed after the FDD device is chucked on a rotating disk table.

As shown in FIG. 9, the floppy disk has a disk base 20 on which a signal recording surface is formed.
1 and a hub 202 attached to the center of the disk base 201.

[0005] The hub 202 is formed in a substantially dish shape using a magnetic material such as iron. And hub 2
02, a spindle shaft insertion hole 202b into which a spindle shaft 221 described later is inserted and a drive pin insertion hole 202c into which a drive pin 223 described later is inserted are formed, and the spindle shaft insertion hole 202b and the drive pin insertion hole 202c are formed. Are formed at a fixed distance from each other.

As shown in FIG. 11, the spindle shaft insertion hole 202b is formed in a square shape with a length D of one side rounded. The diameter φE of the spindle shaft 221 to be described later is shorter than the length D of one side of the spindle shaft insertion hole 202b. Then, the drive pin insertion hole 202
c is formed in a substantially rectangular shape in which the length of the long side is A and the length of the short side is B and the corner is rounded. Driving pin 22 described later
3 is shorter than the length B of the short side of the drive pin insertion hole 202c.

[0007] The floppy disk 200 constructed as described above is mounted on the disk table 222 of the FDD device, and then rotated together with the rotation of the disk table 222.

In the FDD device, the disk table 2
As shown in FIG. 10, a disk rotation operation unit that rotates the disk drive 22 rotates the disk table 22 by a spindle shaft 221 that is a rotation shaft of a spindle motor (not shown).
2 is rotating. The floppy disk 200
It is mounted on a hub mounting surface 222a which is a main surface portion above the disk table 222.

In the disk table 222,
The drive pin 223 is movably disposed on the hub mounting surface 222a and movably in a direction of coming into contact with and separating from the spindle shaft 221. The drive pin 223 is elastically biased in a direction away from the spindle shaft 221.

In the disk table 222,
A magnet 224 for attracting the outer peripheral portion of the hub 202 of the floppy disk 200 is provided at the outer peripheral portion of the hub mounting surface 222a. The magnet 224 is, for example, a rubber magnet.

A floppy disk 200 is mounted in the FDD device, a hub 202 is mounted on a disk table 222, and a spindle shaft 221 is mounted as shown in FIG.
And the inner edge of the spindle shaft insertion hole 202b, and the outer edge of the drive pin 223 and the inner edge of the drive pin insertion hole 202c may not be in contact with each other. In this case, the drive pin 223 is not subjected to any external force, and the spindle shaft 221 and the drive pin 2
The center-to-center distance of 23 is a distance F.

When the disk table 222 is rotated from the state shown in FIG. 11 in the direction of arrow R in the figure, the load of rotation on the floppy disk 200 causes the floppy disk 200 to receive a torque T ( c) results. Due to the torque T (c) of the floppy disk 200 with respect to the disk table 222, the drive pin 223 is moved relative to the spindle shaft 221 by the inner edge of the drive pin insertion hole 202c, and the floppy disk 200 is moved to the spindle shaft 221 and the drive pin. 223, the spindle shaft 22
In other words, the chucking state is centered on the rotation center of the disk table 222.

At this time, the distance between the centers of the spindle shaft 221 and the drive pin 223 has changed from the distance F to the distance G, and the floppy disk 200
22 is also fixed.

Conventionally, the chucking as described above is caused by friction generated by contact between the liner mounted inside the cartridge and the signal recording surface of the floppy disk 200 during rotation operation of the disk table 222 and the friction of the magnetic head. Head and floppy disk 20
This is performed by using friction generated by contact with the signal recording surface of No. 0. Here, the liner is a non-woven fabric, and is arranged in the cartridge so as to sandwich the signal recording surface of the floppy disk 200.
It has a function of removing dust adhering to the signal recording surface.

Therefore, the above-described disk table 2
When the disk 22 is rotated, the load on the disk table 222 depends on the liner and the floppy disk 2 attached inside the disk table cartridge.
00 caused by friction due to contact with the signal recording surface,
This is the sum of the so-called shell friction torque T (s) and the so-called head friction torque T (h) generated by friction caused by contact between the head portion of the magnetic head and the signal recording surface of the floppy disk 200.

The shell friction torque T (s) caused by the contact between the liner and the signal recording surface is placed on the disk table 222 of the disk rotation operation unit 220 when the disk table 222 is rotated, as shown in FIG. The signal recording surface of the floppy disk 200 is generated by contact with the liner 204 stored in the cartridge 203.

The head friction torque T (h) due to the contact between the head portion of the magnetic head and the signal recording surface is, as shown in FIG.
The magnetic head 205 is generated when the signal recording surface of the floppy disk 200 is pressed by the heads 206, 206 attached to the tips of the support arms 207, 207 in the magnetic head 205.

Therefore, the sum of the friction torques (T (s) + T (h)) represented as described above is required for the above-mentioned centering of the floppy disk 200 with respect to the disk table 222 of the floppy disk 200. When the torque is smaller than the torque T (c), even if the disk table 222 is rotated, the floppy disk 200
Centering cannot be realized. That is, FIG.
To be centered as shown in FIG.
Condition (1) must be satisfied.

(T (s) + T (h))> T (c) (1)

[0020]

By reducing the thickness of the protective film for protecting the magnetic layer, high-density recording of information signals becomes possible. For example, it is conceivable to set the protective film to 0.2 μm.

However, for example, when the floppy disk is rotated at a high speed for high-speed reproduction, the signal of the floppy disk having a thin protective film is generated by friction with the head portion 206 of the magnetic head 205 shown in FIG. The recording surface will be damaged. In this case, the head unit 206
The head load pressure, which is the pressure that presses the signal on the signal recording surface, must be reduced.

In the cartridge 203 shown in FIG. 13, there is a lifter (not shown) for pressing the liner 204 against the signal recording surface.
If 4 is pressed, the signal recording surface will be damaged if the protective film is thin.

On the other hand, considering the contact with the signal recording surface, a suspension type magnetic head that elastically supports the head section 206 is considered to be appropriate. This is because, when the head portion 206 is rigidly supported, the floppy disk becomes highly rigid during high-speed rotation, so that a gap is generated between the head portion and the floppy disk, and a spacing loss occurs. When the head portion is elastically supported in this manner, the head load pressure, which is the pressure for pressing the head portion 206 against the floppy disk, decreases.

From the above, in the case of a floppy disk capable of high-density recording, the head load pressure of the head portion should be reduced, and a lifter for pressing the liner against the signal recording surface should be used. It is desired not to. However, in such a case, the left side of the above equation (1) becomes small, that is, the load on the floppy disk becomes small, and the centering state cannot be obtained as shown in FIG.

Therefore, the present invention has been made in view of the above-mentioned circumstances, and even when the torque is reduced by changing the head load pressure of the magnetic head, the lifter, or the like, the disk table can be used. It is an object of the present invention to provide a disk drive device capable of performing centered chucking.

[0026]

In order to solve the above-mentioned problems, a disk drive device according to the present invention increases the rotational frictional force of the disk-shaped recording medium mounted on a disk table in accordance with a control signal. A frictional force applying means; and a control means for controlling the application of the rotational frictional force of the frictional force applying means by a control signal. When the disc-shaped recording medium is mounted by the control means, the rotational frictional force is applied by the frictional force applying means. Increase.

Thus, in the disk drive device, the frictional force applying means controlled by the control means increases the rotational frictional force of the disc-shaped recording medium during the chucking operation which is assumed to be mounted.

[0028]

Embodiments of the present invention will be described below with reference to the drawings. In this embodiment, a floppy disk drive device (hereinafter, referred to as a “disk drive”) that rotates a floppy disk, which is a disk-shaped recording medium, and records or reproduces information signals on a signal recording surface of the floppy disk to be rotated. FDD device). In addition, the floppy disk, as described later,
The cartridge is rotatably housed in a cartridge that is a substantially thin box-shaped housing, and is mounted on the FDD device while being housed in the cartridge. The floppy disk is housed in a cartridge to form a so-called disk cartridge.

As shown in FIGS. 1 and 2, the FDD device has a hub 10 of a floppy disk 101 on a main surface thereof.
2, a spindle table 42 provided on the main surface of the disc table 41, and a spindle shaft 42, which is a rotary shaft inserted into a spindle shaft insertion hole 102b provided in the center of the hub 102. The hub 102 is provided movably with respect to the main surface and provided on the main surface and at a predetermined distance from the spindle shaft insertion hole 102b.
A drive pin 43 fitted in a drive pin hole 102c provided on the disk table, a rotation motor 44 serving as a rotation operation means for rotating the disk table 41, and a rotational friction force of the floppy disk 101 mounted on the disk table 41 are controlled. A pressing means 2 and an abutting portion 3 which are frictional force applying means for increasing in accordance with a signal; a control circuit 4 for controlling the application of rotational frictional force of the frictional force applying means by a control signal;
Detecting means 5 for detecting the type of floppy disk 101
It is composed of

Here, the control circuit 4 increases the rotational frictional force by the pressing means 2 constituting the frictional force applying means when the floppy disk 101 is mounted on the apparatus, specifically, during the chucking operation. .

The pressing means 2 is configured as a so-called solenoid plunger, and includes a driving element 2a formed in a rod shape and serving as a moving member, and a driving element 2a.
and a solenoid coil portion 2b for moving a.

The driver 2a of the pressing means 2 is a disk cartridge 1 mounted on a disk table 41.
The cartridge No. 00 is movable in a direction facing the outer side surface 104a of the cartridge No. 00 and is movably attached to the solenoid coil 2b.

When the current is supplied to the solenoid coil 2b of the pressing means 2, the driver 2 can be moved in the axial direction facing the above, that is, in the direction of coming into contact with and separating from the outer side surface 104a. By changing the current supply to the solenoid coil 2b of the pressing means 2, the control circuit 4 controls the movement of the driver 2a.

The abutting portion 3 is arranged such that the driver 2a is disposed on the outer surface 104a of the cartridge 104 in the pressing direction, and the cartridge 104 opposes the outer surface 104a of the cartridge 104 pressed by the driver 2a.
Is attached so as to be in contact with the outer side surface 104b of the.

The pressing means 2 is controlled by the control circuit 4 so that when the floppy disk 101 is mounted on the apparatus, it changes from FIG. 1 to FIG.
The driver 2a is controlled to control the outer surface 1 of the cartridge 104.
04a is pressed. The pressing means 2 is controlled by the control circuit 4 to release the pressing of the outer surface 104a of the cartridge 104 when recording or reproducing the information signal on the floppy disk 101 as shown in FIG.

The disk rotation operation section 40 rotates the disk table 41 by the spindle shaft 42 serving as a rotation drive shaft of a rotation motor 44.

In the disk table 41, the drive pins 223 provided so as to be movable with respect to the main surface.
Are elastically urged in a direction away from the spindle shaft 42. Further, the disk table 222 has a hub 102 of the floppy disk 101 located at the outer peripheral portion.
A magnet (not shown) for attracting the outer peripheral portion is provided.

Here, the floppy disk and the FDD
The configuration of the device will be described in detail. Note that the configuration of the floppy disk will be described using the state of a so-called disk cartridge 100 including the cartridge 104.

As shown in FIGS. 3 to 5, the disk cartridge 100 includes a cartridge 1 comprising a floppy disk 101, an upper half 111 and a lower half 112.
04 and a shutter 114 slidably disposed on one side edge of the cartridge 104.

The floppy disk 101 has basically the same configuration as the floppy disk 200 shown in FIG. That is, the floppy disk 101
A disk base portion 103 on which a signal recording surface is formed;
Hub 10 provided at the center of disk base 103
And 2.

As shown in FIGS. 3 and 5, the hub 102 is formed in a substantially dish shape using a magnetic material such as iron. The hub 102 has a spindle shaft 4
2 and a drive pin insertion hole 102c into which the drive pin 43 is inserted. The spindle shaft insertion hole 102b and the drive pin insertion hole 10b are formed.
2c is formed at a fixed distance from the substrate 2c.

The cartridge 104 is composed of an upper half 111 and a lower half 112 made of an ABS resin injection molded product containing an antistatic material, and the outer peripheral portions of the upper half 111 and the lower half 112 are joined and welded. It has a flat box shape as a whole.

As shown in FIG. 3, a circular central opening 115 is provided substantially at the center of the lower half 112, and is a peripheral portion of the central opening 115 and the lower half 112.
An annular wall portion 116 is integrally formed on the inner surface of. The floppy disk 101 is fitted with the hub 102 in a state where the hub 102 has some room in the central opening 115.

An annular wall 117 is formed integrally with the center inner surface of the upper half 111, and an annular wall 118 concentric with the annular wall 117 is integrally formed around the annular wall 117. Is formed. In the floppy disk 101, the end of the concave portion of the hub 102 is sandwiched between the annular walls 117 and 119 having different diameters, and there is a margin between the annular walls 117 and 118. It is inserted and arranged.

The upper half 111 and the lower half 112
Are provided with four arc-shaped ribs 119, 120 so as to form a concentric circle with respect to the central opening 115.
Are formed integrally at equal intervals. By forming the ribs 119 and 120 in this manner, the upper half 11
When the cartridge 104 is assembled by superimposing the lower half 1 and the lower half 112 on each other, the ribs 119 of the upper half 111 and the ribs 120 of the lower half 112 are arranged in the same circumference and the four Combined at the two corners to form substantially one rib each. The floppy disk 101 is arranged in the cartridge 104 so as to be surrounded by the ribs configured as described above.

The upper half 111 and the lower half 112
The magnetic head entry openings 121 and 1 each have a substantially rectangular shape so as to extend in the radial direction from the center opening 115.
22 are formed. This magnetic head entry opening 1
The upper halves 11 and 122 are opposed to each other.
1 and the lower half 112.

By providing the magnetic head entry openings 121 and 122 in the cartridge 104 in this manner,
The floppy disk 101 accommodated in the cartridge 104 has magnetic head entry openings 121 and 1 respectively.
Through 22, a part of the signal recording surface formed on both the front and back surfaces can be exposed to the outside.

The cartridge 104 has a liner made of a non-woven fabric formed in substantially the same shape as the disk base 103 in order to remove dust and the like attached to the signal recording surface of the disk substrate 103 on the floppy disk 101. 123 and 124 are respectively attached.

The liners 123, 124 are formed with long holes 124a extending in the radial direction (the long holes of the liner 123 are not shown). The liners 123 and 124 are aligned with the upper halves 11 so that the elongated holes are opposed to each other and coincide with the magnetic head entry openings 121 and 122 formed in the upper half 111 and the lower half 112.
1 and the lower half 112 respectively.

The four projections 125 of the upper half 111
And four projections 126 of the lower half 112 are connected to the upper half 1
These are positioning projections fitted to each other when the lower half 11 and the lower half 112 are combined.

Then, as shown in FIG. 4 and FIG. 5, the disc cartridge 100 determines whether or not the information signal recorded on the stored floppy disk 101 may be erased by overwriting or erasing operation. And a disk identification hole 132 which is an identification hole of the type of the floppy disk. In the case of a floppy disk on which information signals are recorded at high density, for example, FIG.
, A disc identification hole 133 is provided. These disk identification holes 132 and 133 enable, for example, identification of floppy disks having different recording densities of information signals.

The disk cartridge 100 includes
The magnetic head entry openings 121 and 122 are opened and closed so that the magnetic head entry openings 121 and 122 can be opened and closed.
A slidable shutter 114 is mounted at a side edge of the cartridge 104 in which the cartridge 22 is provided. The shutter 114 is, for example, aluminum,
It is formed in a U-shaped cross section using stainless steel, synthetic resin, or the like.

The shutter 114 has openings 134 corresponding to the magnetic head entry openings 121 and 122. The shutter 114 is connected to the cartridge 104.
The openings 34 are slidably attached to the magnetic heads, so that these openings 34 can be inserted into the respective magnetic head entry openings 121 and 1.
22 can be opened or closed.

The FDD device mounts the disk cartridge 100 configured as described above and records or reproduces an information signal on a signal recording surface while performing a rotation operation.

As shown in FIG. 6, the FDD device has a substantially flat chassis 51.
1, a motor mounting opening 52 provided substantially at the center.
And a disk rotation operation unit 40 arranged facing the upper surface side of the shear 51.

The disk rotation operation section 40 is for rotating the floppy disk 101 and is formed on a stator substrate 45.

An electronic circuit board 58 is mounted on the lower surface of the chassis 51. Various electronic circuits and detection switches are provided on the electronic circuit board 58. Further, below the chassis 51, an electronic circuit board 5 is provided.
The lower cover 62 is attached so as to cover the lower surface of the lower cover 8.

On the upper side of the chassis 51, the disk cartridge 100 is
A cartridge holder 59 for mounting the floppy disk 101 in the disk drive 00 on the disk table 41 is provided. That is, the cartridge holder 59 stores and holds the disk cartridge 100 inserted and operated from the front side of the FDD device 50, and moves the floppy disk 101 to the disk table 41 by being moved downward. This cartridge holder 5
Reference numeral 9 denotes a thin housing having a front side and a lower side that are open, and is capable of accommodating the disk cartridge 100 inserted and operated from the front side.

A cam plate 60 for moving the cartridge holder 59 up and down and an operation plate 61 for moving the cam plate 60 in the front-rear direction are provided on the chassis 51.
Are arranged.

The cam plate 60 is disposed between the cartridge holder 59 and the chassis 51, and has a pair of side walls having cam grooves formed on both side edges.
Copying pins projecting from both side portions of the cartridge holder 59 are engaged with the cam grooves in the side wall portions.

The operation plate 61 is located above the cartridge holder 59, and is connected to the cam plate 60. That is, when the operation plate 61 is moved in the front-rear direction as indicated by an arrow K in FIG.
Is moved in the front-rear direction. When the cam plate 60 is located on the rear side of the chassis 51, the cartridge holder 59 is at an upper position for separating the disk cartridge 100 being held upward from the disk table 41. When the cam plate 60 is slid to the front of the chassis 51, the cartridge holder 59 is lowered as shown by an arrow J in FIG. At the lower position.

The cam plate 60 is elastically urged forward by an urging member (not shown). A lock lever 69 for locking the cam plate 60 at a rear position on the chassis 51 is provided on the rear side on the chassis 51.

A front panel 64 is attached to the front edge of the chassis 51. The front panel 64 includes
A slit 65 for inserting the disk cartridge 100 is formed. The front panel 64 has an ejection button opening 67a for the ejection button 66 to face outward and a display light opening for the indication lamp 68 to face outward. 67b are provided.

When the eject button 66 is pressed from the front side, the operation plate 61 is moved to the rear side to move the cam plate 60 to the rear side, and the cam plate 60 is locked by the lock lever 69. Let it.

Then, on the chassis 51, the FDD
A magnetic head 63 is provided behind the device 50. The magnetic head 63 includes a pair of support arms 63.
a, 63a, and a head portion attached to the distal end side of each of the support arms 63a, 63a.
Here, the heads are attached to the support arms 63a, 63a so as to be at positions facing each other.

The support arms 63a, 63a are elastically urged in a direction to bring their distal ends closer to each other as shown by an arrow I in FIG. That is, the respective head portions are urged in directions in which they are pressed against each other. For example, the support arms 63a, 63a are configured as a so-called suspension type, which has good followability of the head portion to the signal recording surface. These support arms 63a, 63a can be moved in the front-rear direction, which is the direction of contact and separation with the disk rotation operation unit 40, as indicated by the arrow J in FIG.

On the chassis 51, a plurality of detection switches are provided corresponding to predetermined positions on the bottom surface of the inserted disk cartridge 100. That is, a disk-in detection switch 78 for detecting the presence of the disk cartridge 100 is provided on the chassis 51. Further, on the chassis 51, a write protection detection switch 79 is provided corresponding to the write protection identification hole 131 of the disk cartridge 100. On the chassis 51, disk capacity detection switches 80a and 80b are provided corresponding to the disk capacity identification holes 132 and 133 of the disk cartridge 100.

The pressing means 2 is, for example, a chassis 5
1, and the abutting portion 3 is provided on the cartridge holder 59.

A description will be given of a case where the floppy disk 101 is mounted on the FDD device 50 configured as described above. When the disk cartridge 100 is mounted on the FDD device 50, the disk cartridge 100 is inserted from the front side of the FDD device 50 through the slit 65 of the front panel portion 64. The disc cartridge 100 is mounted in the cartridge holder 5.
9 and held. At this time, in the disk cartridge 100, the shutter 114 is slid with respect to the cartridge 104, and the magnetic head entry openings 121 and 122 are opened. The cartridge 1 is inserted through the magnetic head entry openings 21 and 22.
The floppy disk 101 facing the outside of 04 is inserted between the support arms 63a, 63a. That is, at this time, the heads are opposed to both signal recording surfaces of the floppy disk 101, respectively.

The disk cartridge 100 inserted into the cartridge holder 59 is
And the lock to the cam plate 60 by the lock lever 69 is released. The cam plate 60 unlocked by the lock lever 69 moves forward of the FDD device 50 by the urging force of the urging member. This cam plate 6
By the movement of 0, the cartridge holder 59 descends to the disk table 41 side.

When the cartridge holder 59 is lowered, the four corners of the disk cartridge 100 held by the cartridge holder 59 are supported on the tips of positioning pins (not shown) erected on the chassis 51. Positioned. The positioned disk cartridge 100 is placed on a disk table 41, for example, as shown in FIG.

When the disk cartridge 100 is positioned on the chassis 51 in this manner, the presence of the cartridge 104 and the presence or absence of a plurality of identification holes provided on the bottom of the cartridge 104 are determined by the presence of the bottom of the disk cartridge 100. Are detected by a plurality of detection switches provided on the chassis 51 corresponding to the predetermined positions of the identification holes and the positions of the identification holes. That is, the disc cartridge 100 is operated by the disc-in detection switch 78.
Is detected. The detection of the write protection identification hole 131 of the disk cartridge 100 by the write protection detection switch 79 determines whether the information signal already recorded on the floppy disk 100 can be erased by overwriting or erasing. And
Disc capacity discriminating holes 132, 1 of disc cartridge 100 by disc capacity detection switches 80a, 80b.
The floppy disk is determined by the detection of 33.

The FDD device 50 configured as above is
The following chucking operation is performed when the disk cartridge 100 is mounted. For example, when the FDD device is mounted, similarly to the case shown in FIG.
The case where the outer peripheral surface 2 and the inner edge of the spindle shaft insertion hole 102b and the outer peripheral surface of the drive pin 43 and the inner edge of the drive pin insertion hole 102c do not contact each other will be described.

The FDD device uses the disk cartridge 10
0 is the floppy disk 101 attached to the device.
However, as shown in FIG. 1, as a chucking operation, when the cartridge is placed on the disk table 41, the control circuit 4 controls the pressing means 2 to press the outer surface 104 a of the cartridge 104 with the driver 2 and Then, the disk table 40 is rotated.

That is, during the chucking operation, the FD
The device D uses the driver 2a to operate the cartridge 104.
Is pressed, and the pressed portion is curved and deformed so as to be convex with respect to the signal recording surface of the stored floppy disk 101. As a result, the contact pressure between the liner 105 in the pressed portion of the cartridge 104 and the signal recording surface of the floppy disk 101 is increased. While the contact pressure is thus increased,
The FDD device rotates the disk table 41.

Thus, when the disk table 41 is rotated, the rotational friction generated between the signal recording surface of the floppy disk 101 and the liner 105 increases. That is, the shell friction torque T (s), which is the friction torque generated by the contact between the liner 105 and the signal recording surface, increases.

Therefore, even if the head load pressure of the magnetic head is small, the floppy disk 101
Since the rotational frictional force generated between the signal recording surface and the liner 105 is increased, the floppy disk 101 can be brought into a centered chucking state as shown in FIG.

Accordingly, even if the head load pressure of the magnetic head is reduced by supporting a floppy disk capable of high-density recording with a thin protective film, the centering chucking of the floppy disk 100 is performed. State.

The liner 1 is installed in the cartridge 104.
Even when there is no lifter for abutting the disc 05 on the signal recording surface, the floppy disk 101 can be brought into the centered chucking state.

Further, even when a suspension type magnetic head in which the head portion is elastically supported in order to improve the contact of the head portion with the signal recording surface is adopted, the floppy disk 101 is similarly centered as described above. Can be in a chucking state.

The pressing means 2 and the abutting portion 3 serving as the frictional force applying means can arbitrarily determine a position where the outer surface of the cartridge 104 is pressed. For example, this can prevent the movement of the magnetic head performed during recording or reproduction or the like from being hindered.

At the time of recording and reproducing operation, as shown in FIG. 1, the pressing of the outer surface 104a of the cartridge 104 by the driver 2a is released, and thereafter, recording or reproducing is performed.

Further, the load on the disk table 41 of the floppy disk 101 during the rotation operation of the disk table 41 can be further increased by the magnetic head. For example, even when a chucking operation is performed, the signal recording surface can be held by the magnetic head.

The detecting means 5 includes a disk capacity detecting switch 80 for detecting the type of the floppy disk.
a, 80b, the control circuit 4 can also control the pressing means 2 based on the detection results from the disk capacity detection switches 80a, 80b.

Thus, for example, only for a specific floppy disk, as shown in FIG.
The chucking operation can be performed by pressing the outer side surface 104a of the head 04. For example, as shown in FIG. 2, an outer surface 104a of a cartridge 104 is pressed by a pressing means 2 on a standard type floppy disk capable of recording 2 MB data, while a high-density recording is performed. As shown in FIG. 1, it is possible to prevent the cartridge 104 from being pressed by the pressing means 2 with respect to the floppy disk that can be used. In this case, the floppy disk capable of high-density recording is fixed to the disk table 41 by other means.

By doing so, the present invention can be applied to an FDD device configured to be able to perform recording and reproduction operations on floppy disks having different recording densities.

Further, as shown in FIGS. 7 and 8, the frictional force applying means in the FDD device includes a first clamp member 11 which comes into contact with a first signal recording surface 103a of the floppy disk 101, and a floppy disk. 101
And a second clamp member 12 that contacts the second signal recording surface 103b.

The floppy disk 101 is usually housed in a cartridge 104 as shown in FIGS. 3 to 5 to constitute the disk cartridge 101. In FIGS. Is omitted.

The first and second clamp members 11 and 12 are supported by moving means 14. The moving means 14 is, for example, a piezoelectric element.

The control circuit 15 controls the moving means 14 to bring the first clamp member 11 and the second clamp member 12 into contact with the signal recording surface of the floppy disk 101, and from the signal recording surface. They can be separated.

The clamper 13 can hold the disk base 103 by bringing the first clamp member 11 and the second clamp member into contact with the signal recording surface of the floppy disk 101 by the moving means 14.

The first clamp member 11 constituting the clamper 13 enters through the magnetic head entry opening 121 of the cartridge 104 shown in FIG. 4, and the second clamp member 12 shown in FIG. The cartridge 104 enters from the magnetic head entry opening 122 of the cartridge 104 and comes into contact with the signal recording surface. The clamper 13 is configured so as to retract the first clamp member 11 and the second clamp member 12 during recording or reproduction so as not to prevent the magnetic head from entering the magnetic head entry opening.

It is needless to say that the materials of the first clamp member 11 and the second clamp member 12 are appropriately determined in consideration of the protection of the signal recording surface.

With this configuration, the FDD
During chucking operation, the apparatus clamps the disk base 103 of the floppy disk 101 placed on the disk table 41 by the clamper 13 as shown in FIGS.

The clamper 13 applies a rotational frictional force larger than at least the rotational frictional force generated between the magnetic head and the signal recording surface to the first clamp member 1.
It is configured to be generated by the above-described sandwiching between the first and second clamp members 12.

Thus, at the time of rotating the disk table 41 during the chucking operation, the first clamp member 11 and the second clamp member 12 press the disk base 103 so that the first clamp member 11 and the second 1, the rotational frictional force generated by contact with the signal recording surface 103a, and the second clamp member 12 and the second
Generates a rotational frictional force due to contact with the signal recording surface 103b. That is, the friction torque generated by the clamping of the clamper 3 is added to the left side of the above equation (1).

Therefore, even if the head load pressure of the magnetic head is small, the rotational friction force generated by the contact between the first clamp member 11 and the first signal recording surface 103a and the second clamp member By applying a rotational frictional force due to the contact between the second signal recording surface 103b and the second signal recording surface 103b, the floppy disk 101 can be brought into a centered chucking state as shown in FIG.

Therefore, even when the head load pressure of the magnetic head is reduced by supporting a floppy disk capable of high-density recording with a thin protective film, the centering chucking of the floppy disk 100 is performed. State.

The liner 1 is installed in the cartridge 104.
Even when there is no lifter for abutting the disc 05 on the signal recording surface, the floppy disk 101 can be brought into the centered chucking state.

Further, even when a suspension type magnetic head in which the head portion is elastically supported in order to improve the contact of the head portion with the signal recording surface is employed, the centering of the floppy disk 101 is similarly performed. Can be in a chucking state.

Further, similarly to the chucking operation performed using the pressing means 2 described above, the control circuit 15
Disk capacity detection switch 80 serving as detection means 16
The operation of the clamper 13 can also be controlled based on the detection results from a and 80b.

Thus, for example, only for a specific floppy disk, as shown in FIG.
Thus, the chucking operation can be performed while holding the signal recording surface.

The clamp member 1 is directly fixed on the signal recording surface of the floppy disk 101 by the clamper 13.
Since the first and second members 1 and 12 are in contact with each other, it is possible to more surely increase the rotational friction force than a unit that presses the outer surface of the cartridge 104 by the above-described pressing means 2 to increase the rotational friction force. In addition, the clamper 13
Without causing deformation or the like in the cartridge 104,
The rotational friction force can be increased.

[0104]

The disk drive according to the present invention has the following features.
A frictional force applying means for increasing the rotational frictional force of the disc-shaped recording medium mounted on the disc table in accordance with a control signal; and a control means for controlling the application of the rotational frictional force by the frictional force applying means by the control signal. The rotational friction force is increased by the frictional force applying means when the disk-shaped recording medium is mounted by the control means, so that the rotational friction force of the disk-shaped recording medium is increased during the chucking operation when the disk-shaped recording medium is mounted. Can be.

Thus, the disk drive device can reliably perform the chucking centered on the disk table even when the torque is reduced by changing the head load pressure of the magnetic head or the lifter. Can be.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a configuration of a part of a FDD device according to an embodiment of the present invention, which chucks a floppy disk.

FIG. 2 is a configuration diagram illustrating a part of the FDD device and illustrating an operation at the time of a chucking operation.

FIG. 3 is an exploded perspective view showing a disk cartridge including a floppy disk chucked on a disk table in the FDD device.

FIG. 4 is a front view showing the disk cartridge.

FIG. 5 is a rear view showing the disk cartridge.

FIG. 6 is an exploded perspective view showing a configuration of the FDD device.

FIG. 7 is a configuration diagram illustrating another configuration for chucking a floppy disk, which is a part of the FDD device according to the embodiment of the present invention.

FIG. 8 is a configuration diagram illustrating a portion including the other configuration of the FDD device and illustrating an operation at the time of a chucking operation.

FIG. 9 is a configuration diagram showing a shape of a floppy disk chucked on a disk table of the FDD device.

FIG. 10 is a perspective view illustrating a configuration of a disk rotation operation unit that rotates the disk table.

FIG. 11 is a diagram showing a state when the hub of the floppy disk is placed on the disk table, for example, a state before a chucking operation.

FIG. 12 is a diagram showing a state when the hub of the floppy disk is placed on the disk table, and showing a state after a chucking operation.

FIG. 13 is a cross-sectional view showing a configuration of a conventional disk drive device, in which chucking is performed using friction between a liner and a signal recording surface of a floppy disk.

FIG. 14 is a cross-sectional view illustrating a configuration of a conventional disk drive device, in which chucking is performed using friction between a head portion of a magnetic head and a signal recording surface of a floppy disk. .

[Description of References] 2 pressing means, 3 butting portion, 11 first clamp member, 12 second clamp member, 13 clamper,
50 FDD device

Claims (6)

[Claims] 1. A disk table on which a hub portion of a disc-shaped recording medium is mounted on a main surface portion; and a center hole provided on the main surface portion of the disk table and provided in a center portion of the hub portion. A driving shaft that is movable on the main surface portion and is provided on the main surface portion, and is inserted into a drive pin hole provided on the hub portion at a predetermined distance from the center hole. A pin, a rotating operation means for rotating the disk table, a frictional force applying means for increasing a rotational frictional force of the disc-shaped recording medium mounted on the disk table in accordance with a control signal, and a frictional force applying means. Control means for controlling the application of the rotational frictional force by the control signal, wherein the control means controls the rotational frictional force by the frictional force applying means when the disc-shaped recording medium is mounted. Disk drive device characterized by increasing the number of disk drives. 2. The frictional force applying means presses an outer surface of a housing containing the disc-shaped recording medium, thereby causing a protection member for protecting a signal recording surface attached inside the housing to be protected. 2. The disk drive device according to claim 1, wherein the rotational friction force is applied by pressing the signal recording surface. 3. The disk according to claim 2, wherein said frictional force applying means includes a pressing means for pressing an outer surface of a housing containing said disc-shaped recording medium. Drive device. 4. The first contact member that contacts the first signal recording surface of the disc-shaped recording medium,
A second signal contacting the second signal recording surface of the disc-shaped recording medium
2. The rotating member according to claim 1, wherein the disk-shaped recording medium is sandwiched between a first member and a second member to apply the rotational friction force. Disk drive device. 5. The frictional force applying means according to claim 1, wherein said recording / reproducing head for writing or reading an information signal to or from said signal recording surface of said disc-shaped recording medium has a rotational frictional force generated between said recording and reproducing head and said signal recording surface. 5. The disk drive device according to claim 4, wherein a large rotational friction force is generated by said sandwiching of said first contact member and said second contact member. 6. A detecting device for detecting a type of a disk-shaped recording medium to be mounted, wherein the control device controls the frictional force applying device based on a detection result of the detecting device. The disk drive device according to claim 1.