JPH0379783B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION TECHNICAL FIELD The present invention relates to a magnetic disk device using a magnetic disk as a recording medium, and particularly to a magnetic disk device in which a magnetic disk can be reliably mounted on a disk drive spindle.

"Prior Art and its Problems" In a magnetic recording/reproducing device using a magnetic disk as a recording medium, a center hub provided at the center of the magnetic disk and a spindle for driving the magnetic disk are placed in a predetermined position. It is necessary to fit and install it. This is to suppress as much as possible the deviation of the center position when the disk is installed, which is the main cause of off-track. FIG. 3 shows a conventional mounting structure between a spindle and a center hub.A center hub 2 provided at the center of a magnetic disk 1 has two abutments at predetermined angles in its mounting hole 2a. Contact surface 3,
4 is formed, and a pressing member 5 made of an elastic body is provided opposite the steel contact surfaces 3 and 4.
To attach and position the disk 1 to the spindle 6 for driving the disk, the spindle 6 is forcibly inserted into the attachment hole 2a while deforming the pressing member 5, and the elasticity of the pressing member 5 pushes the spindle 6 onto the contact surface 3. , 4.

As a tracking method for this positioning method, a method is adopted in which a magnet is attached to the center hub receiving part provided on the spindle 6 side, and the center hub 2 is closely fixed to the receiving part on the spindle 6 side by this magnetic force, for example, a still video standard method. In this case, reliable chucking cannot be guaranteed unless the disk 1 is forcibly inserted into the spindle 6 in order to elastically deform the pressing member 5 on the center hub 2 side.

Many proposals have been made regarding this forced insertion method, for example, Japanese Patent Laid-Open No. 59-207473, Japanese Patent Laid-open No. 60
This is done as shown in Japanese Patent Application Laid-open No. 57566, Japanese Patent Application Laid-open No. 109058-1982, and Japanese Patent Application Laid-open No. 191465-1987.

However, all of these conventional devices
A forced insertion member for mounting the disk 1 on the spindle is moved forward and backward relative to the center hub 2, and the structure is complicated. That is, this forced insertion member becomes an obstacle when inserting the disk case into the disk holder, and if it remains pressed against the center hub 2 after chucking the disk 1, it becomes a rotational load when the spindle 6 rotates. Therefore, in this state, the forced insertion member must be completely evacuated from the disk 1. For this reason, in conventional devices, the pressing mechanism for the forced insertion member becomes complicated and the space it occupies becomes large, which is one factor that hinders miniaturization and thinning of the device.

``Object of the Invention'' The present invention solves the above-mentioned problems and achieves a smaller and thinner device, while also reliably mounting the disk on the spindle without interfering with disk attachment/detachment and rotational drive. The purpose is to obtain a device that can.

"Summary of the Invention" The present invention departs from the idea of moving a forced insertion member forward and backward with respect to the center hub in order to apply a pressing force to the center hub in the direction of the spindle axis. It was completed based on the idea of using the force when approaching the disk as a force for attaching the disk.

That is, the present invention comprises: a base having a spindle; a lid that can be opened and closed with one end pivotally attached to the base; and a disk holder with one end pivotally attached to the inner surface of the lid into which the magnetic disk can be inserted and removed. , a hub holding member provided on the inner surface of the disk holder at a position corresponding to the center hub, and a hub holding member provided between the lid and the disk holder, which applies a rotation biasing force to the disk holder in the same direction when the lid is closed on the base. When the spring means, the lid body, and the disk holder are closed on the base, once they are rotated from the correct recording/reproducing position to the hub forced insertion position in the closing direction,
Equipped with a lock mechanism that locks into the recording and playback position,
The hub pressing member is characterized in that it presses the center hub of the magnetic disk in the axial direction via the spring means at the hub forced insertion position of the lid, and separates from the center hub at the recording/reproducing position.

“Embodiments of the invention” The invention will now be described with reference to the illustrated embodiments.

1A to 1C are side sectional views showing an embodiment of the magnetic disk device of the present invention, in which a base 10 forming the main body of the device has a spindle 6 that is rotatably driven for driving the disk. And this base 10
A shaft 11 is attached to the shaft 11 via a bracket (not shown), and a lid 12 is pivotally attached to the shaft 11 at one end so as to be openable and closable. The other end of this lid 12 serves as an opening/closing end. A disk holder 13 is further rotatably attached to the shaft 11 at one end coaxially with the lid 12 so as to be openable and closable with respect to the base 10 and the lid 12. The other end of the disk holder 13 is formed with an opening 15 through which the magnetic disk 1 assembled in the disk case 14 is inserted into the disk holder 13.

When the disk case 14 is inserted into the disk holder 13, a spring member 1 made of a plate spring or the like is installed inside the disk holder 13 in order to always press the disk case 14 against the base 10 side.
6 and 17 are attached. Further, as shown in FIG. 1, on the inner surface of the lid 12, there is a spring such as a leaf spring that comes into contact with the disk holder 13 when the lid is closed and applies a rotation biasing force to the disc holder 13 in the same direction. Members 61 and 62 are attached. Further, the disk holder 13 is provided with a hub presser, which is one of the features of the present invention, which presses the hub 2 at the hub forced insertion position shown in FIG. A member 60 is formed by bending the center of the holder 13. The spring members 61 and 62 are attached to the disk holder 1.
The hub holding member 60 may be attached to the holder 13 as a separate member.

A hub receiving portion 19 having a receiving surface 18 that comes into contact with the center hub 2 of the magnetic disk 1 is provided at the tip of the spindle 6 . Further, a magnet 20 is attached to the hub receiving portion 19, and the magnet 20 has an attracting surface at a position slightly retracted from the receiving surface 18.
Positioning pins 21 and 22 are provided protruding from the base 10 and fit into holes formed in the disk case 14. With these positioning pins 21 and 22, the disk case 14 itself is positioned at the recording/reproducing position.

A roller 29 serving as an engaging portion is provided at the opening/closing end of the lid 12, and a locking mechanism for fastening the lid 12 in a closed state by engaging with the roller 29 is provided. It is provided on the front side of the base 10 shown on the right side in FIG.

When a force is applied to close the lid 12 and disk holder 14, this locking mechanism moves them to the hub forced insertion position shown in FIG. The recording/playback position is locked to the indicated position. Although the present invention does not concern the structure of this locking mechanism itself, illustrative examples will be explained with reference to FIGS. 2A to 2C.

Guide pins 30 and 31 protruding from the base 10
A lock lever 32 is partially slidably attached to elongated holes 33 and 34 formed in the lock lever 32. The sliding stroke of the lock lever 32 is determined by the effective length of the elongated holes 33, 34.
Further, this lock lever 32 is integrally formed with a lock pawl 35 that engages with the roller 29.
An inclined surface 36 forming a predetermined angle with respect to the locus of movement of the roller 20 during the opening/closing operation of the lid body 12 is formed on the lock pawl 35, and a flat surface 37 in the direction of the locus of movement is formed at the tip of the lock pawl 35. is formed. Further, the lock lever 32 includes a roller 2.
A stopper surface 38 is provided for abutting against the lid body 9 and regulating the maximum closing position (closest position to the spindle 6) when the lid body 12 is closed. A spring member 39 made of a tension spring or the like is attached between the lock lever 32 and the base 10 to urge the lock lever 32 to move in a direction in which its lock pawl 35 engages with the roller 29.

A stopper lever 41 is rotatably attached to a support shaft 40 fixed to the base 10. In addition, the stopper lever 41 includes this and the base 10.
A spring member 48 attached between the two provides an elastic force to rotate clockwise in the figure.
This stopper lever 41 has a cam groove 4 that engages with a stopper pin 42 protruding from the lock lever 32.
It engages with the lock lever 32 at part 3. This cam groove 43 has a lock portion 44, and this lock portion 44 is such that the lock lever 32 is locked against the spring member 3.
When the stopper lever 41 moves to the leftmost position, that is, the position where the roller 29 and the lock pawl 35 engage, as shown in FIG. is set so that the position is shifted toward the lock pawl 35 side from the stopper surface 38 of the lock lever 32.
A stopper portion 46 is provided on the stopper lever 41, and an inclined surface 47 is formed in the cam groove 43 by the stopper portion 46. The lock lever 32 is moved toward the right in FIG.
9 and the lock pawl 35, the stopper lever 41 rotates counterclockwise in FIG. 2 due to the sliding movement of the inclined surface 47 and the stopper pin 42, As shown in C, the stopper surface 45 substantially coincides with the stopper surface 38.

To release the locked state shown in Figure 2A,
A lock release button 50 is attached to the base 10 so as to be movable in a direction parallel to the lock lever 32. This lock release button 50 has a spring member 5 such as a tension spring stretched between it and the base 10.
1, it is urged to move leftward in FIG. The lock release button 50 also includes a lever pushing portion 5 that comes into contact with the lock lever 32.
2 is provided, and a release pin 54 that comes into contact with a rotation stopper 53 provided at the tip of the stopper lever 41 is also provided.

Next, a procedure for attaching and detaching the magnetic disk 1 in the illustrated magnetic disk device of the present invention will be described.

First, as shown in FIG. 1B, when the lid 12 is open, the disk case 14 in which the magnetic disk 1 is installed is inserted into the disk holder 13 through the opening 1.
Insert from 5. At this time, the lock mechanism shown in FIG. 2 is in the state shown in FIG. 2A. However, at this time, the roller 29 has not approached the locking mechanism. The inserted disk case 14 is pressed against the lower surface of the disk holder 13 by spring members 16 and 17. Next, when force is applied to the lid 12 in the direction of closing it, the spring members 61 and 62 come into contact with the disk holder 13,
A force in the closing direction begins to be applied to the holder.

When the lid 12 is subsequently rotated to the state shown in FIG. 1A, the disk case 14 itself is set at the recording and reproducing position by the positioning pins 21 and 22. However, in this state, the hub 2 is not necessarily completely inserted into the spindle 6 at a predetermined position. Furthermore, in this state, the opening and closing ends of the lid 12 are not locked to the base 10 via the rollers 29. Therefore, the lid body 1
2 in the closing direction, the lid 12 is rotated to the hub forced insertion position, that is, the maximum closed position, as shown in FIG. 1C. In this state, the disk holder 13 is given a force in the closing direction by the spring members 61 and 62 on the inner surface of the lid body 12, so the hub pressing member 60 on the inner surface presses the hub 2, and the center hub 2 is completely attached to the spindle. 6 and comes into close contact with the receiving surface 20 of the hub receiving part 19.
In other words, in the device of the present invention, the hub pressing member 60 fixed to the inner surface of the disk case 14 is brought into contact with and pressed against the center hub 2 via the spring members 61 and 62 by the force of closing the lid 12, thereby pressing the magnetic disk. 1 at the correct position on the spindle 6. Even if the lid 12 is pressed any further, the lock mechanism will stop the lid 12.

When you loosen the force pressing the lid 12, the lid 12
returns to the open direction to the position shown in FIG. 1A, and the device of disk 1 is completed. In this position, the lid 12 is locked by the locking mechanism. In addition, in this state, the hub holding member 6
0 leaves hub 2. The case holder 14 includes spring members 61 and 62 attached to the lid body 12,
Spring member 1 attached to disk holder 13
6 and 17, the disk holder 13 is pressed against the lower surface of the disk holder 13 and held in a predetermined position.

The operating state of the lock mechanism when the lid 12 is rotated as described above will be explained.

When the lid 12 is closed from the state shown in FIG. Contact with. When the lid 12 is further pressed, the lock lever 32 slides to the right in FIG. 2 due to contact with the inclined surface 36, and when the roller 29 contacts the flat surface 37, the lock lever 32 reaches its maximum sliding stroke. Become. As the lock lever 32 slides, the stopper pin 42 also moves, and this and the inclined surface 4 of the cam groove 43 move.
7, the stopper lever 41 is moved to the support shaft 4.
Rotates counterclockwise around 0. However, just before the roller 29 gets over the flat surface 37, that is, just before the lock claw 35 and the roller 29 engage with each other, the stopper pin 42 slides along the slope 47, gets over the stopper part 46, and engages the spring member 48. Therefore, the stopper lever 41 engages with the right side of the stopper portion 46. Therefore, even if the roller 29 moves further downward and separates from the flat surface 37, the lock pawl 35 is moved slightly by the spring member 39 to the left side in the figure by the amount of play between the cam groove 43 and the stopper pin 42. If it only moves, the stopper pin 42 will stop at the stopper portion 46, and the lock pawl 35 will not slide to the left in the figure, so the lid 12 will not be locked. In this way, even when the lid 12 is closed to the recording/reproducing position shown in FIG. 1A, the lid 12 is not locked.

When the lid 12 is further pushed, the roller 29 comes into contact with the stopper surface 38 of the lock lever 32 and also with the stopper surface 45 of the stopper lever 41, as shown in FIG. 2C. At this time, the hub is in the forced insertion position. Then, the stopper pin 42 separates from the stopper part 46 and lock lever 32
The spring member 39 returns to its original position. This causes the roller 29 to engage with the lock pawl 35.
In this state, when the force applied to the roller 29, that is, the lid 12, is released, the stopper pin 42 is moved by the cam groove 43 as the stopper pin 42 moves.
2 returns to the lock portion 44, as shown in FIG. 2A. In other words, the lid 12 is rotated in the opening direction to the recording/reproducing position. At this time, the roller 29 comes into contact with the stopper surface 38 of the lock lever 32, thereby preventing the lid 12 from further moving in the closing direction. This prevents the center hub 2 from being pressed by the hub pressing member 60 after locking.

The lock is released by sliding the lock release button 50 to the right in the figure. That is, when this button 50 is slid to the right, the lever pushing portion 52 presses the lock lever 32, causing it to slide to the right in the figure. Accordingly, the stopper pin 42 moves, and the cam groove 43 causes the stopper lever 41 to rotate counterclockwise. As shown in FIG. 2B, just before the stopper pin 42 gets over the stopper part 46 of the cam groove 43, the lock release button 50 is on the rotation stopper part 53 of the stopper lever 41, and the stopper pin 42 is moved over the stopper part 46 of the cam groove 43. It is prevented from falling to the right side of the stopper part 46.
When this state is reached, the roller 29 is released. When the release button 50 is then released, the release button 50 is returned to its original position by the spring 51, and the lock lever 41 is also returned to its original position. Note that a member such as a pin may be used instead of the roller 29 as the engaging portion.

"Effects of the Invention" As described above, the magnetic disk device of the present invention moves the disk holder to the forced insertion position where it approaches the spindle again by closing the lid, and then locks it at the recording/reproducing position. In the forced insertion position, a pressing force in the axial direction of the spindle is applied to the center hub of the magnetic disk via the spring means provided between the lid and the disk holder and the hub pressing member provided on the inner surface of the disk holder. Since the hub holding member separates from the center hub at the recording/reproducing position, the hub holding member does not become an obstacle when inserting or removing a magnetic disk from the disk holder, and the hub holding member does not cause rotational resistance at the recording/reproducing position. It will never happen. The hub holding member is fixed to the inner surface of the disk holder,
Since the magnetic disk device itself does not move, and the spring means provided between the lid and the disk holder does not move itself, the magnetic disk device can be made thinner and smaller.

[Brief explanation of drawings]

1A to 1C are cross-sectional views showing an embodiment of the magnetic disk device of the present invention, FIGS. 2A to 2C are front views showing the locking mechanism of the lid, and FIG. 3 is a sectional view of the magnetic disk device inserted into the spindle. FIG. 3 is a plan view showing the center hub. 1... Magnetic disk, 2... Center hub, 6...
... spindle, 10 ... base, 12 ... lid body,
13... Disk holder, 14... Disk case, 15... Opening, 29... Roller (engaging portion),
32... Lock lever, 60... Hub holding member,
61, 62... Spring means.

Claims (1)

[Claims] 1. A center hub of a magnetic disk is provided with a mounting hole into which a spindle for driving the magnetic disk is inserted, and a pressing member that presses the spindle to one side of the mounting hole, and the magnetic disk is pressed against the spindle. In a magnetic disk device that is mounted while pressing the center hub in the axial direction of the spindle and deforming the pressing member during mounting, there is provided a base having the above-mentioned spindle; a cover body having one end pivotally connected to the base and capable of being opened and closed; a disk holder for inserting and removing the magnetic disk, one end of which is pivotally connected to the inner surface of the lid; a hub holding member provided at a position corresponding to the center hub on the inner surface of the disk holder; provided between the lid and the disk holder; a spring means that applies a rotation biasing force to the disc holder in the same direction when the lid is closed on the base; The hub holding member is provided with a locking mechanism that locks the magnetic disk in the recording/reproducing position after the hub is rotated to the hub forced insertion position, and the hub holding member holds the center hub of the magnetic disk via the spring means at the hub forced insertion position of the lid. A magnetic disk device characterized by being pressed in the axial direction and separated from a center hub at a recording/reproducing position. 2. In claim 1, the inner surface of the disk holder is provided with spring means for pressing the case of the magnetic disk toward the spindle,
A magnetic disk device in which the pressing force of the hub pressing member against the center hub is set by the difference in spring force between this spring means and the spring means on the lid body side.