JP3241407B2 - Disk drive device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention is applied to a case where power is not supplied (when not in use).
The present invention relates to a disk drive device in which a head carriage is fixed so as not to move, and the head carriage is protected from external impact.

[0002]

2. Description of the Related Art As a braking means (brake mechanism) for a head carriage of the above-mentioned disk drive device, as shown in FIG. Carriage 10
A movable piece 104 for preventing the movement of the movable piece 3 and a movable piece 104 for sucking the movable piece 104 against the spring force of the spring 101;
04 and a plunger 105 for releasing the contact of the braking member 102, and when the plunger 105 is energized, the movable piece 104 is attracted by the attraction force against the spring force of the spring 101 as described above. When the movable piece 104 and the braking member 102 are released from contact with each other to release the braking and the power supply to the plunger 105 is stopped, the spring 101
The movable piece 104 comes into contact with the braking member 102 by the spring force described above to brake the head carriage 103.

The braking member 102 is formed by attaching a drum to a rotating shaft 107 of a stepping motor 106 as an actuator of a head carriage 103, and has saw-toothed uneven portions 108 provided on the peripheral surface of the drum. Insert the tip of the movable piece 104 into 108,
The head carriage 103 is braked by locking the rotation shaft 107 of the stepping motor 106.

[0004]

By the way, the braking means of the head carriage of the above-mentioned conventional disk drive device has a structure in which all the strokes (movements) of the movable piece 104 when the braking is released are performed by the attraction force of the plunger 105. Therefore, there were the following problems.

(1) The relationship between the stroke amount of the movable piece 104, the spring force of the spring 101, and the suction force of the plunger 105 is as shown in FIG. 6, and the movable piece 104 is braked only by the suction force of the plunger 105. From position A to brake release position C
Plunger 105 with large suction force to move
Need.

(2) Plunger 1 as shown in FIG.
05, use the plunger 1 after braking is released.
In the brake release state 05, the movable piece 104 is kept in the brake release state with a very large holding force. It is sufficient that the spring force is slightly greater than the spring force of the spring 101 at C.) Therefore, wasteful power is consumed and the life of the battery of the disk drive device is shortened.

(3) In order to eliminate the disadvantage of the above item (2), it is conceivable to use the spring 101 in two types, one for holding the brake and the other for holding the release of the brake. In addition, an installation space for mounting two types of springs is required, and the braking means (brake mechanism) becomes large.

According to the present invention, the above-mentioned conventional problems can be solved by assisting the braking operation by the above-mentioned braking means by a plunger assisting means utilizing the rotational force of a spindle motor for rotating a disk. is there.

[0009]

According to the present invention, there is provided a spindle motor for rotating and driving a disk-shaped recording medium, a head carriage for holding a head, and the head moving so that the head moves in a radial direction of the disk-shaped recording medium. A disk drive device comprising a moving means for moving a head carriage, a braking means urged in a braking direction to brake the movement of the head carriage by the moving means, and a moving means for moving the head carriage by the braking means. A plunger that operates against the bias to release the braking state, and a plunger that assists the operation of the plunger against the bias by the rotational force of the spindle motor
And auxiliary means .

[0010]

When the spindle motor starts rotating at the time of recording / reproducing, a plunger utilizing the rotation of the spindle motor is used.
The assisting means assists the operation of releasing the braking of the braking means by the plunger.

Then, finally, the braking of the head carriage by the braking means is released.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG.
This will be described with reference to FIG.

FIG. 1 is a plan view of a disk drive device 1 of the present invention. The disk drive device 1 has a chassis 3 provided with a spindle motor 2 and a cartridge holder 4 mounted on the chassis 3 so as to be able to move up and down. A shutter pin 7 and a lock pin 8 are provided on the lower and upper surfaces of the other end (free end) of the cartridge holder 4, one end of which is rotatably supported by a shaft 6. A shutter opening / closing arm 9, an arm lock lever 10 for locking the shutter opening / closing arm 9 in a state where the shutter of the disk cartridge is opened, and an arm lock lever 10
A lock release mechanism (not shown) for releasing the lock of the shutter opening / closing arm 9 by the operator, and the lock of the shutter opening / closing arm 9 by the arm lock lever 10 by operating the arm lock lever 10 with the lock release mechanism. And a shutter opening / closing arm return spring 11 for returning the shutter opening / closing arm 9 to a predetermined position.

Then, as shown by the two-dot chain line in FIG.
When the shutter opening / closing arm 9 is set at a predetermined position by the spring force of the shutter opening / closing arm return spring 11, the shutter pin 7 is located near the cartridge entrance 12 of the cartridge holder 4, and When the disc cartridge 13 is inserted into the disc cartridge 12, the shutter pin 7 engages with a shutter pin engaging portion (recessed groove) 15 provided on the shutter 14 of the disc cartridge 13, and when the disc cartridge 13 is further inserted. The shutter opening / closing arm 9 pivots clockwise in FIG. 1 around the shaft 6 at one end as a fulcrum, and the shutter 14 is moved sideways by the shutter pin 7.
4 is opened, the lock pin 8 engages with a pin engaging step 16 provided on one side of the arm lock lever 10, and the shutter opening / closing arm 9 is locked by the arm lock lever 10.

The cartridge holder 4 is lowered with the shutter opening / closing arm 9 locked by the arm lock lever 10 as described above.
After loading the disk in the spindle motor 2 on the spindle motor 2 and performing so-called disk loading, when the spindle motor 2 is energized and the disk starts rotating, the head 17
Is brought into contact with the surface of the disk by a head loading mechanism (not shown), so-called head loading is carried out. The recording / reproducing apparatus moves in the radial direction of the disc at 19).

After the end of recording / reproduction, the head 17 is raised,
After the head 17 is separated from the disk, the power to the spindle motor 2 is cut off, the rotation of the disk stops, the cartridge holder 4 rises, and then the head carriage 18 is returned to the standby position by the head carriage driving mechanism 19. After that, the head carriage 1 is moved by a braking means (head carriage brake mechanism) 31 described later.
8, a so-called brake is applied, and the head carriage 18 is fixed so as not to be moved by an external impact, and the head carriage 18 is moved by an external impact,
The head 27 and the disk are prevented from being damaged.

The head carriage driving mechanism 19 has a central portion wound around the peripheral surface of a stepping motor 21 and a belt winding drum 23 provided on a rotating shaft 22 of the stepping motor 21. And a steel belt 24 that changes the rotation of the belt winding drum 23 into a linear motion of the head carriage 18.

When the belt winding drum 23 is rotated in one direction by the stepping motor 21, the steel belt 24 is extended in one direction, and the head carriage 18 is moved along the guide shafts 25 and 26 to the inner circumferential side of the disk. When the belt winding drum 23 is rotated in the other direction, the steel belt 24 extends in the other direction and moves the head carriage 18 toward the outer periphery of the disk.

The disc drive 1 of the present invention comprises a braking means 31 for braking the movement of the head carriage 18 by the moving means 19, and a plunger for releasing the braking state of the head carriage 18 by the braking means 31. 36 and the rotational force of the spindle motor 2
To assist in the brake release operation by the plunger 36 Ri
Plunger assisting means (movable piece operating member) 37. The braking means 31 includes the head winding drum 2
3, a drum-shaped braking member 32 attached to the rotating shaft 22 of the stepping motor 21.
And serrated concave and convex portions 3 provided on the peripheral surface of the braking member 32.
33 are provided with a movable piece 34 whose leading end is engaged with the movable carriage 34 to prevent the head carriage 18 from moving, and a spring 35 which engages the movable piece 34 with the concave and convex portions 33. ing. The plunger 36 sucks the movable piece 34 against the spring force of the spring 35, and
4 and the braking member 32 are released from engagement. Above plunger
As described above, the auxiliary means 37 includes the plunger 3.
In order to assist the suction force of No. 6, the movable piece 34 is moved in the suction direction of the plunger 36 against the spring force of the spring 35 using the rotational force of the spindle motor 2. I have.

As shown in FIGS. 2 and 3, the plunger assisting means 37 is made of metal, plastic, or the like in the shape of an elongated plate, and has elongated slide guide holes 38 at both ends in the longitudinal direction. , 39 are provided, and a rectangular driving pin receiving hole 40 is provided between the slide guide holes 38, 39.

Guide pins 4 provided on the chassis 3 of the disk drive 1 in the slide guide holes 38 and 39.
By inserting the first and second inserters 42, the plunger assisting means 37 is slidably mounted on the chassis 3 and is rotated about the shaft 43 by the spindle motor 2 in the drive pin receiving hole 40. Cam 4
An offset pin 45 provided at a position eccentric to the shaft 43 is inserted on the shaft 4.

When the cam 44 is rotated by the spindle motor 2, one side surface 40 a of the drive pin receiving hole 40 is pushed by the offset pin 45, and the plunger is assisted.
It means 37 slides along the slide guide hole 38, 39 and the guide pins 41 and 42, the plunger auxiliary hand
The movable piece 34 is connected via a connecting piece 46 provided at the end of the step 37.
Is moved from the braking position A to a position B in the middle of the braking release position C, as shown in FIG. 4, against the spring force of the spring 35.

The disk drive device 1 of the embodiment has been described above.
Since the configuration is as described, the head carriage 18
When the brake is applied, first, the cam 44 is
The plunger assisting means 3 is rotated by the cam 44.
7, the plunger 36 is energized at a position B where the movable piece 34 of the braking means 31 is moved by a predetermined amount in the suction direction of the plunger 36, and as shown in FIG. The brake can be released by the plunger 36.

In the embodiment shown in FIG.
Is shown attached to the rotating shaft 22 of the stepping motor 21, but the braking member 32 may be attached to the head carriage 18 itself.

[0025]

According to the disk drive of the present invention, the following effects can be obtained.

(1) Braking can be released using a plunger having a small capacity, that is, a small suction force.

(2) Since a small-capacity plunger can be used, the power consumption required for holding force for holding the brake release state can be reduced, and the life of the battery can be prolonged.

(3) Braking hold and brake release hold 2
Simplifies the structure compared to those using different types of springs,
The braking means can be made compact.

[Brief description of the drawings]

FIG. 1 is a plan view of a disk drive device according to the present invention.

FIG. 2 is a plan view of a main part.

FIG. 3 is a plan view showing a state in which a movable piece of a braking means is moved in a plunger suction direction by a plunger assisting means.

FIG. 4 is an explanatory diagram showing a relationship between a stroke of a movable piece, a spring force of a spring, and a suction force of a plunger.

FIG. 5 is a conventional plan view.

FIG. 6 is an explanatory view showing a relationship between a stroke of a conventional movable piece, a spring force of a spring, and a suction force of a plunger.

[Explanation of symbols]

1. Disk drive device 2. Spindle motor 1
8 head carriage, 31 braking means, 32 braking member, 34 movable piece, 35 spring, 36 plunger,
37 ... Plunger auxiliary means .

Claims (1)

(57) [Claims] 1. A spindle motor for rotating a disk-shaped recording medium, a head carriage for holding a head, and a moving means for moving the head carriage so that the head moves in a radial direction of the disk-shaped recording medium. A braking unit biased in a braking direction to brake the movement of the head carriage by the moving unit; and a plunger operable against the biasing to release a braking state of the head carriage by the braking unit. And the plunger is driven by the rotational force of the spindle motor.
Plunger assisting hand for assisting operation against the above bias
Disk drive apparatus characterized by comprising: a stage, a.