JP2534214Y2 - Magnetic disk drive - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic disk drive, and more particularly to a magnetic disk drive configured to reliably perform a clamping operation when a disk case containing a magnetic disk is inserted.

[0002]

2. Description of the Related Art For example, in a magnetic disk drive in which a 5-inch flexible magnetic disk is mounted and magnetic recording and reproduction is performed, an operation lever on the front of the device is turned 90 degrees after a disk case is inserted through an insertion slot. Thus, the magnetic disk is clamped. However, in this conventional device, not only is the operation of the operation lever troublesome, but also the operation lever can be operated even when the disk case is not completely inserted, so that the magnetic disk that is being inserted may be clamped. was there.

Accordingly, the present applicant has filed Japanese Patent Application No. Hei.
No. 9 proposed a magnetic disk drive configured to be able to clamp a magnetic disk without operating the operation lever. In this proposed magnetic disk drive, a clamp arm is provided on a transverse member suspended above a chassis on which a magnetic disk is mounted, and a clamper is provided on a tip of the clamp arm rotatably supported by the transverse member. When the disk case is inserted, the lever mechanism rotates to press the base end of the clamp arm.

Then, the clamp arm is rotated around a rotation fulcrum supported by the horizontal member to lower the clamper,
The magnetic disk is clamped between the clamper and the turntable by the spring force of the leaf spring at the tip of the clamp arm.
Further, the magnetic disk device is provided with a disk detection sensor for detecting a leading end portion of the disk case inserted into the device, and when a detection signal is output from the disk detection sensor, the control circuit causes the control circuit to detect the magnetic disk. After confirming the attachment, the processing required for the next magnetic recording and reproduction is executed.

[0005]

However, in the magnetic disk drive, the magnetic disk is centered by rotating the turntable at the time of the clamping operation, and the control circuit controls the insertion end of the disk case inserted into the device. It is confirmed that the magnetic disk is mounted by the detection signal from the disk detection sensor for detecting the portion, and the turntable is driven to rotate. Therefore, even after the disk is clamped, the disk case continues to be detected by the disk detection sensor, and the turntable driving motor remains driven. Therefore, the turntable is rotating even if there is no magnetic recording / reproducing command from the host, and the turntable driving motor is driven while the disk case is inserted into the apparatus. Therefore, conventionally, when the disk case is left inserted in the apparatus, there is a problem that power is wasted.

Further, in the above magnetic disk drive, although the time from when the disk case is inserted into the drive to when the clamper clamps the magnetic disk is relatively short, the disk detection sensor detects the insertion end of the disk case. Therefore, the magnetic disk is clamped to the turntable before the turntable is rotated or before the turntable is sufficiently rotated. There is a problem that the peripheral portion is caught between the annular guide of the turntable and the magnetic disk is deformed.

Accordingly, an object of the present invention is to provide a magnetic disk drive which solves the above-mentioned problems.

[0008]

According to the present invention, there is provided a disk detection sensor provided near a disk insertion slot for detecting that a disk case containing a magnetic disk is inserted, and the magnetic disk is provided at the tip of a clamp arm. A clamp detection sensor for detecting that the clamper is clamped to the turntable by the clamper, and a turntable driving motor is rotationally driven by a detection signal from the disk detection sensor, and the turntable is driven by a detection signal from the clamp detection sensor. Control means for stopping the motor for use.

[0009]

The magnetic disk is prevented from being caught between the clamper and the turntable during the clamping operation by rotating the turntable driving motor according to the detection signal from the disk detection sensor provided near the disk insertion slot. In addition to this, power consumption is saved by stopping the turntable driving motor by a detection signal from a clamp detection sensor that detects that the magnetic disk is clamped on the turntable.

[0010]

1 to 3 show an embodiment of a magnetic disk drive according to the present invention.

In each of the figures, a magnetic disk drive 1 has a front bezel 3 having a disk insertion slot 3a attached to the front of a flat chassis 2 on which a disk case (not shown) containing a 5-inch magnetic disk is mounted. Have been. The chassis 2 is integrally formed by, for example, aluminum die-casting. As shown in FIG. 2, support stands 2a to 2d on which a disk case is mounted project from the upper surface, and edges of the disk case are mounted on both ends. The stepped portions 2e and 2f to be protruded.

As shown in FIG. 4, the magnetic disk 30 is housed in a thin disk case 33. The disk case 33 has a central opening 33a for clamping, an oval opening 33b for a magnetic head, and an index. An opening 33c for hole detection and a write-protect notch 33d are formed. The magnetic disk 30 is provided with an index hole 30a passing through the index hole detecting opening 33c by rotation of the turntable 10 during magnetic recording and reproduction, and a clamp central hole 30b.

Reference numeral 4 denotes a latch lever.
And a locking pin 4b for locking a slide lever 6 described later, and is rotatably supported on the chassis 2 by a shaft 4c.

Reference numeral 5 denotes a coil spring, one end of which is a latch lever 4
And the other end is hooked to a hook 13h of the base 13 described later. Therefore, the latch lever 4 is urged counterclockwise by the tensile force of the coil spring 5.

Reference numeral 6 denotes a slide lever which is slidably provided in the A and B directions by pins 2h and 2i fitted in the long holes 6a and 6b. The slide lever 6 has a T-shaped hole 6c into which the locking pin 4b of the latch lever 4 is fitted. Before the disk case 33 is inserted, the slide lever 6 is moved in the direction A by the locking pin 4b of the latch lever 4. Locked.

Reference numeral 7 denotes a coil spring, one end of which is hooked to the chassis 2 and the other end of which is hooked to a hook (not shown in FIG. 3) of the slide lever 6. Therefore, the slide lever 6 is urged in the direction B by the tensile force of the coil spring 7.

Reference numeral 8 denotes a damper having a gear 8a that meshes with the rack 6e of the slide lever 6. That is, when the slide lever 6 slides in the A and B directions, the rotational load of the gear 8a is transmitted to the rack 6e, and the operating speed of the slide lever 6 is reduced.

Reference numeral 9 denotes a connecting lever, which is a shaft 2j on the chassis 2.
It is rotatably supported by. The connecting lever 9 includes a first arm 9a which is curved so as to avoid the turntable 10 and extends in the lateral direction, and a second arm 9b which projects in a direction opposite to the first arm 9a. Have. First arm 9a
Is formed into a bifurcated engagement portion 9c.
Engages with a protruding pin 6f protruding below the slide lever 6. Therefore, when the slide lever 6 slides in the directions A and B, the connecting lever 9 rotates about the shaft 2j. The connecting lever 9 is provided with a cam 9d having a step-like step on the lower side of the tip of the second arm 9b.

The turntable 10 is provided on a substrate 19 mounted on the lower surface of the chassis 2, and a turntable drive motor 20 is provided on the lower surface of the substrate 19.
An optical sensor 22 for detecting that the magnetic disk in the disk case 33 is clamped, a connector 23, a control circuit (not shown), and the like are provided on the substrate 21 provided adjacent to the substrate 19. Have been.

As shown in FIG. 5, the optical sensor 22 comprises a photo-interrupter having a light emitting element 22a and a light receiving element 22b, and has a space 22c formed between the light emitting element 22a and the light receiving element 22b as described later. When the protruding portion 25a of the disc insertion guide 25 enters and the light from the light emitting element 22a is blocked, a disc clamp detection signal is output. By outputting the disk clamp detection signal, the rotation of the turntable drive motor 20 for centering during the clamping operation is stopped. Therefore, the turntable drive motor 20 is stopped after the disk case 33 is inserted into the device, thereby saving power.

Returning to FIGS. 1 to 3, the description will be continued. 11
Is an eject button, which is fixed to the end of the slide lever 6 and is pushed in the direction A when the mounted disc case 33 is ejected.

Reference numeral 12 denotes a clamp arm, which is a bracket 13a, 13b of a base 13 which is suspended above the chassis 2.
The shaft 14 is supported by a shaft 14. As shown in FIGS. 6 and 7, a “C” -shaped leaf spring 15 is attached to one end of the clamp arm 12.
At the other end, a roller 12a that contacts a cam 9d rising from the second arm 9b of the connecting lever 9 is supported. or,
The clamp arm 12 is an arm 1 extending laterally (direction A).
2b, a disc insertion guide 25 extending in the B direction is provided at the tip of the arm 12b.

Numeral 16 denotes a clamper which is supported by a leaf spring 15 as shown in FIGS. The clamper 16 is suspended so as to be inserted into the opening 13 c of the base 13, and is fitted to a guide pin 26 a projecting downward from a bracket 26 laid over the opening 13 c to move vertically. Guided.

A coil spring 17 for urging the clamp arm 12 in the counterclockwise direction (D direction) is interposed between the base 13 and the clamp arm 12. Therefore, the clamp arm 12 before the disk is inserted rotates in the direction D around the shaft 14 by the spring force of the coil spring 17 to separate the clamper 16 from the turntable 10.

Further, the magnetic disk 3 is mounted on the base 13.
A substrate 29 provided with a reflection type optical sensor 27 for detecting a zero index hole 30a and an optical sensor 28 for detecting write protection (write protection) is attached. The optical sensor 28 receives light from a light emitting element (not shown) provided on the chassis 2 and outputs a disk detection signal when the disk case 33 passes and is blocked. When the write protection notch 33d of the disk case 33 faces the optical sensor 28, the optical sensor 2
8 outputs a write inhibit notch detection signal.

The optical sensor 28 is also used as a sensor for detecting that the disk case has been inserted from the disk insertion opening 3a of the front bezel 3 as described later. That is, when a disk case detection signal is output from the optical sensor 28, the turntable drive motor 20 is started, the turntable 10 is rotated, and the disk clamping operation is facilitated. The optical sensor 28 is disposed near the disk insertion slot 3a, and can output a detection signal earlier than the conventional case when the disk case is inserted.

The base 13 has small holes 13d to 13g at the left and right ends into which four screws 18a to 18d are inserted, and screws 18a to 18g inserted into the small holes 13d to 13g.
18d is screwed into the screw holes 2n to 2q of the chassis 2 to be fixed to the edges 2k and 2m protruding from both sides of the chassis 2. As a result, the clamper 16 is held at a position facing the turntable 10 from above, and the rollers 12a
Is positioned at a position where it contacts the cam 9d of the connecting lever 9.

As shown in FIG. 8, the disc insertion guide 25 is supported by a shaft 12c at the tip of the arm 12b so as to be rotatable in the directions E and F with respect to the arm 12b of the clamp arm 12. The disc insertion guide 25 is urged to rotate in the direction E by the spring force of the torsion spring 24 so as to be parallel to the arm 12b. On the lower surface of the disc insertion guide 25, a protruding portion 25a that functions as a detected portion at the time of disc clamping protrudes downward.

Incidentally, as described above, the disc insertion guide 25
Is configured to be rotatable, so that the clamp arm 12 comes into contact with the chassis 2 and rotates in the F direction while descending to the clamp position. Therefore, the distance between the arm 12b and the disk insertion guide 25 is increased at the time of inserting the disk so that the disk insertion operation can be easily performed. Corresponds to a reduction in the thickness of the apparatus by reducing the space between the arm portion 12b and the disk insertion guide 25 to reduce the space in the vertical direction.

A head carriage 31 is slidably provided on the chassis 2 in the disk radial direction (A and B directions). The head carriage 31 is, as shown in FIG.
Lower arm 31b provided with lower magnetic head 31a
And an upper arm 31 provided with an upper magnetic head 31c
d. The upper arm 31d is provided rotatably in the up-down direction. Before the disk is inserted, the engaging portion 31e protruding laterally contacts the arm portion 12b of the clamp arm 12 and rotates upward. .

Reference numeral 32 denotes a carriage drive motor, which is attached to the rear portion of the chassis 2 and rotationally drives a lead screw 32a engaged with the head carriage 31 to move the head carriage 31 in the A and B directions.

As shown in FIG. 10, the optical sensors 22,
Reference numeral 28 is connected to a control circuit 35. The control circuit 35 drives and controls the turntable 10, the carriage drive motor 32, and the magnetic heads 31a and 31c to perform magnetic recording and reproduction as described later.

Here, the operation of the magnetic disk device 1 having the above configuration and the processing executed by the control circuit 35 will be described. When the optical sensor 28 detects the disk case 33, the control circuit 35 executes the processing shown in FIG.

In the magnetic disk drive 1 before the disk case 33 is inserted, the slide lever 6 is locked at the position where the slide lever 6 is slid in the direction A by the eject operation, and the clamper 16 is at a position separated from the turntable 10. It is rising. The upper arm 1 of the head carriage 18
8d is also rotating upward.

When the disk case 33 is inserted into the magnetic disk device 1, the front edge of the disk case 33 on the insertion side passes below the optical sensor 28 and comes into contact with the contact portion 4a of the latch lever 4. . When the optical sensor 28 detects the insertion of the disk case 33 in step 1 (hereinafter, “step” is omitted) of FIG. 11 (see FIG. 13), the control circuit 35 proceeds to S2 and starts the turntable drive motor 20. The turntable 10 is rotated.

Further, when the disk case 33 is pressed in the direction A, the latch lever 4 rotates clockwise about the shaft 4c.

The rotation of the latch lever 4 causes the locking portion 4
The lock of the slide lever 6 by b is released, and at the same time, the slide lever 6 slides in the B direction by the tensile force of the coil spring 7. Further, the slide lever 6 operates smoothly due to the resistance of the damper 8.

The disk case 3 inserted as described above
3 reaches a predetermined insertion position, and the center hole 30a of the magnetic disk 30 coincides with the turntable 10. When the slide lever 6 slides in the direction B as described above,
The connecting lever 9 engaging with f rotates clockwise about the shaft 2j. Therefore, the roller 12 of the clamp arm 12
The cam 9d of the connecting lever 9 that has been in contact with the cam 9d is displaced in the same direction, and the contact position of the roller 12a moves from a low place of the cam 9d to a high place through an inclined portion.

Therefore, the clamp arm 12 is connected to the shaft 1
7 and 12, the clamper 16 descends toward the guide hole 10a of the turntable 10 while being guided by the guide pin 26a.

As a result, the magnetic disk 30 in the disk case 33 is clamped by the clamper 16 and the turntable 10. At this time, the turntable 10 is rotating, and the magnetic disk 30 can be accurately centered. Further, the clamper 16 presses the magnetic disk against the turntable 10 by the pressing force of the leaf spring 15.

Along with the clamp operation, the disk insertion guide 25 provided on the arm portion 12b extending to the side (direction A) of the clamp arm 12 is lowered together with the clamp arm 12. As a result, the upper arm 31b of the head carriage 31 descends to bring the upper magnetic head 31c into contact with the magnetic disk 30. In this way, the protruding portion 25a of the disc insertion guide 25 enters the space 22c of the optical sensor 22 while rotating in the F direction while coming into contact with the chassis 2 in the process of descending. Therefore, the projection 25a of the disc insertion guide 25 is connected to the light emitting element 22a and the light receiving element 22.
b to block light from the light emitting element 22a so as not to reach the light receiving element 22b.

As a result, the optical sensor 22 outputs a disk clamp detection signal (S3), and as shown in FIG. 13, when the disk clamp detection signal is output, the control circuit 35 turns the turntable with a momentary delay (time t). The rotation of the motor 20 is stopped (S4). Then, the magnetic disk device 1
In the above, the magnetic head 31
a and 31c are in sliding contact with each other, and magnetic recording and reproduction can be performed.

As shown in FIG. 13, the disc insertion slot 3a
By rotating the turntable driving motor 20 in response to a detection signal from an optical sensor 28 serving as a disk detection sensor provided in the vicinity, the magnetic disk 30 bites between the clamper 6 and the turntable 10 during the clamping operation. Power consumption by stopping the turntable driving motor 20 by a detection signal from the optical sensor 22 serving as a clamp detection sensor for detecting that the magnetic disk 30 is clamped to the turntable 10. Is saved.

The clamping operation of the magnetic disk 30 and the lowering operation of the upper arm 31d of the head carriage 31 are performed by rotating the connecting lever 9, and the driving force is the pulling force of the coil spring 7. However, the connecting lever 9 has a length of the first arm 9a longer than that of the second arm 9b, and the force for rotating the clamp arm 12 is enlarged by the principle of leverage. Is transmitted a sufficient clamping force.

In step S5, when the host issues a magnetic recording / reproducing command, the turntable driving motor 20
Is rotated (S6), and magnetic recording / reproduction is performed (S7).

In the next step S8, when an end command is output from the host, the process proceeds to step S9, where the turntable drive motor 20 is stopped. Next, it is checked whether the optical sensor 22 has been turned off. Here, when the eject button 11 is pressed in the direction A and the disc case 33 is ejected, the detection signal of the optical sensor 22 is turned off.
Then, when the detection signal of the optical sensor 22 is turned off, it is determined that the disk case 33 has been ejected, and a series of processing ends. However, in S10, when the detection signal of the optical sensor 22 is ON, the disc case 33 is still mounted, so the process returns to S5 and repeats the processes from S5 to S10.

When ejecting the disk case 33 mounted as described above, it is only necessary to press the eject button 11 in the direction A. When the eject button 11 is pressed in the direction A and the slide lever 6 slides in the same direction, the latch lever 4 rotates counterclockwise along the hole 6 c of the slide lever 6 by the tensile force of the coil spring 5. Therefore, the latch lever 4 is caused to rotate by the rotation of the disk case 33.
Is pressed in the direction B and the slide lever 6 is locked at the eject position.

Further, the connecting lever 9 is a slide lever 6
Rotates counterclockwise in conjunction with the above-mentioned sliding operation. As a result, the contact position of the roller 12a moves to a lower position of the cam 9d, and the clamp arm 12 rotates in the direction D by the pressing force of the torsion spring 17, and raises the clamper 16 to separate it from the turntable 10. At the same time, the disc insertion guide 25 also moves up, and the upper arm 31d rotates upward. Since a series of these operations are performed simultaneously, at the same time when the eject button 11 is pressed, the clamper 16 and the upper arm 31d are raised and the disc case 3 is moved.
3 is pressed by the latch lever 4 and ejected.

[0049]

As described above, the magnetic disk device according to the present invention rotates the turntable driving motor in response to the detection signal from the disk detection sensor provided near the disk insertion slot, so that the magnetic disk device performs the magnetic operation during the clamping operation. By preventing the disk from being caught between the clamper and the turntable, and by stopping the turntable drive motor by a detection signal from a clamp detection sensor that detects that the magnetic disk is clamped to the turntable. It has features such as saving power consumption.

[Brief description of the drawings]

FIG. 1 is a perspective view of an embodiment of a magnetic disk drive according to the present invention.

FIG. 2 is an exploded perspective view of a base and a chassis that support a clamp arm.

FIG. 3 is an exploded perspective view of the magnetic disk drive.

FIG. 4 is a plan view of the disk case.

FIG. 5 is a diagram showing a disc insertion guide and an optical sensor.

FIG. 6 is an exploded perspective view of a clamper, a clamp arm, and an optical sensor for detecting write protection.

FIG. 7 is a side view of a clamper and a clamp arm.

FIG. 8 is a perspective view of a clamp arm and a disc insertion guide base.

FIG. 9 is a side view of the head carriage.

FIG. 10 is a block diagram of a main part of the present invention.

FIG. 11 is a flowchart illustrating a process executed by a control circuit.

FIG. 12 is a longitudinal sectional view for explaining a clamper operation.

FIG. 13 is a timing chart of detection signals from a control circuit and each sensor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Magnetic disk drive 2 Chassis 4 Latch lever 6 Slide lever 9 Connecting lever 10 Turntable 12 Clamp arm 13 Base 15 Leaf spring 16 Clamper 20 Turntable drive motor 22, 28 Optical sensor 25 Disk insertion guide 33 Disk case 35 Control circuit

Claims (1)

(57) [Scope of request for utility model registration] 1. A disk detection sensor provided near a disk insertion slot and detecting that a disk case containing a magnetic disk is inserted, and the magnetic disk is clamped to a turntable by a clamper provided at a tip of a clamp arm. Control means for rotating a turntable drive motor by a detection signal from the disk detection sensor, and stopping the turntable drive motor by a detection signal from the clamp detection sensor; A magnetic disk drive.