JP2001250344A - Disk driving device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a magnetic head and/or a disk surface from being injured by holding the magnetic head so as not to be moved and not to carelessly apply head landing onto the disk surface even when a disk driving device is applied with a large shock. SOLUTION: In a head collision preventing mechanism, a lock weight 32 having described mass is freely rotatably provided near a carriage, a part to be pressed 35 of the lock weight is located in a moving orbit of a pressing nail 33 formed at the carriage. Further when mass of the lock weight is Ww and total mass of a transporting body to be moved by a head transporting mechanism is Wc, a relation between a distance (Lw) in a direction orthogonally crossing a moving direction of the carriage from center of gravity (G) of the lock weight to the rotation center (O) of the lock weight and a distance (Lc) in a direction orthogonally crossing a moving direction of the carriage from a contacting position (A) of the lock weight with the carriage to the rotation center (O) of the lock weight satisfies formula: Ww×Lw>Wc×Lc.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a disk drive device. More specifically, the present invention relates to a technique for preventing a magnetic head from moving and preventing a magnetic head from inadvertently landing on a disk surface even when a large impact is applied to a disk drive device due to a drop or the like when the magnetic head is unloaded.

[0002]

2. Description of the Related Art A disk drive device records or reproduces a signal by moving a magnetic head in a radial direction of a disk-shaped recording medium or in a direction close thereto.

In a state where the magnetic head is not landed on the disk surface, that is, in a head unloading state (also referred to as a take-off state), the magnetic head is positioned outside the outer circumference of the disk-shaped recording medium. In accordance with the head loading command, the magnetic head is moved over the disk surface by the head transfer mechanism and landed on the disk surface.

[0004]

Incidentally, the magnetic head may move due to inertia when moving the place of the disk drive or when carrying the disk drive itself.

Normally, when a disk-shaped recording medium is removed from a disk drive (when ejected)
Means that the magnetic head is in its retracted position (hereinafter
It is referred to as the "parking position". The magnetic head is not moved even when the disk drive device is carried.

However, it is conceivable that a disk-shaped recording medium is carried in a state of being loaded in a disk drive device. Particularly, in recent years, with the spread of notebook personal computers and mobile computers, computers may be carried around, and it is expected that disk drive devices mounted on such computers are constantly operated.

When the magnetic head is in a free state, the magnetic head moves forward (moves in the head loading direction) from the retracted position when it is carried, and the head is landed on the disk surface. Become.

In this state, the disk-shaped recording medium is not rotating, and there is no air flow due to rotation between the magnetic head and the disk surface. There is a problem that the magnetic head and / or the disk surface is damaged.

In order to solve such a problem, for example,
1999 Patent Application No. 3202 filed by the present applicant
No. 45 discloses a disk drive device.

According to the disk drive described in the specification of this application, when the magnetic head is located at the retracted position, the cantilever arm of the head arm is formed at the rear end of the lifter for temporary fixing. By positioning the carriage on the slope, the carriage does not move forward, that is, does not move in the head loading direction even if the disk drive device receives a slight impact.

[0011]

However, in the disk drive device disclosed in Japanese Patent Application No. 320245/1999, when a large impact, for example, when the disk drive device is dropped, the lifter is required. If the cantilever arm is merely positioned on the temporarily fixed slope, the carriage will move in the head loading direction, and the magnetic head will land on the disk surface carelessly.

This is because the temporarily fixed slope is of such a degree that it can be easily overcome by the propulsive force of the linear motor.

Therefore, the present invention is to prevent the magnetic head from moving even when a large impact is applied, such as when the disk drive device is dropped, and to prevent the head from inadvertently landing on the disk surface. It is an object to prevent the magnetic head and / or the disk surface from being damaged.

[0014]

Therefore, in order to solve the above-mentioned problems, the disk drive apparatus of the present invention has a head transfer mechanism for transferring a magnetic head in a radial direction of a magnetic disk, and a large head transfer mechanism for unloading the magnetic head. A head collision preventing mechanism for preventing a magnetic head from colliding with a magnetic disk by preventing a carriage of the head moving mechanism from moving when an impact is applied, wherein the head moving mechanism comprises a magnetic head. A head shaft, a guide shaft slidably supporting the carriage, and a linear motor unit for driving the carriage to move the magnetic head in the radial direction of the magnetic disk; A lock weight having a predetermined mass is rotatably provided near the carriage,
The pressed portion of the lock weight is located in the movement locus of the pressing claw formed on the carriage, and when the carriage moves in the head loading direction by driving the linear motor, the lock weight is rotated to move the carriage. And the distance (Lw) in the direction perpendicular to the moving direction of the carriage from the center of gravity (G) of the lock weight to the rotation center (O) of the lock weight, and the contact of the lock weight with the carriage. Distance (Lc) in the direction perpendicular to the moving direction of the carriage from the part (A) to the center of rotation (O) of the lock weight
Is such that when the mass of the lock weight is Ww and the total mass of the transfer body moved by the head transfer mechanism is Wc, Ww × Lw> Wc × Lc.

Therefore, in the disk drive device of the present invention, the normal operation (at the time of driving by driving the linear motor unit)
When the carriage is moved in the head loading direction from the retracted position (unload position), the pressed portion of the lock weight is pressed, rotated and pushed away to move forward, and the magnetic head can be moved in the head scanning range. Can be transported to
The lock weight can prevent the carriage from moving in the head loading direction by trying to rotate in the direction opposite to the direction in which the lock is rotated by the carriage. Even if the disk drive device is dropped in the state of being loaded into the disk, the magnetic head does not move in the head loading direction, and the head does not inadvertently land on the disk surface.
Alternatively, damage to the disk surface can be prevented.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the disk drive of the present invention will be described below with reference to the embodiments shown in the accompanying drawings.

In the embodiment shown in the drawings, the disk drive of the present invention is connected to a PCMCIA (Persona).
l Computer Memory Card In
The present invention is applied to a so-called PC card type disk drive device which is removably mounted on a mounting portion (hereinafter, referred to as a PC card slot) of the International Association.

For example, as shown in FIG. 1, a notebook personal computer 2 to which a disk drive device 1 according to the present invention is removably mounted is an IC (Integra).
It has a PC card slot 3 through which a PCMCIA standard PC card such as a memory card or a fax modem card can be inserted and removed. In addition,
The PC card slot provided in the notebook personal computer 2 in this embodiment has a specification of TYPEI.
I (Release 2.1). The disk drive 1 of the present invention is not limited to the one used for the PC card slot 3 of the notebook personal computer 2 and is not limited to the PC card type of the PCMCIA standard.

As shown in FIGS. 1 and 2, the disk drive 1 has a housing 4 mounted in a PC card slot 3 provided in a notebook personal computer 2.
A head support mechanism 6 for supporting the magnetic heads 5, 5,
A head transfer mechanism 8 for moving the head support mechanism 6 in the front-rear direction and linearly moving the magnetic heads 5 and 5 supported by the head support mechanism 6 in the radial direction of the magnetic disk 7; 5, a head loading mechanism 9 for landing and take-off, and a disk rotation drive mechanism 1 for rotationally driving the magnetic disk 7
0 (see FIG. 2), and the FD cartridge 11 in which the magnetic disk 7 is rotatably stored is loaded into such a disk drive device 1.

In each of the drawings, a direction indicated by an arrow U and a direction D
Direction, L direction, R direction, F direction, and B direction are respectively
It means upper, lower, left, right, front, and rear. Further, the above-mentioned direction shown in the present specification is for convenience, and is a direction when the disk drive device is used in a so-called horizontal position. It will be changed accordingly.

As shown in FIG. 2, the housing 4 has a mechanical chassis mold portion 12 formed of a synthetic resin material and formed in a rectangular frame shape in the front-rear direction, and the mechanical chassis mold portion 12 formed of a somewhat thick sheet metal material. It comprises a mechanical chassis base plate 13 provided to cover the lower surface of the portion 12 and a top cover 14 provided to cover the upper surface and the left and right side surfaces of the mechanical chassis mold portion 12 with a sheet metal material.

Although the mechanical chassis mold portion 12 and the mechanical chassis base plate 13 are integrally formed by insert molding, the mechanical chassis mold portion 12 and the mechanical chassis base plate 13 are illustrated in the drawing for convenience of explanation. It is shown as a separate object.

Although not shown, a protective seal is adhered to the surfaces of the mechanical chassis base plate 13 and the top cover 14.

As shown in FIG. 1, the external dimensions of the housing 4 are such that the length L is 85 mm, the width W is 54 mm, and the height H is 5 mm. I have.

An eject lever, which will be described later, is disposed on the front portion of the right side piece of the mechanical chassis mold portion 12 so as to extend in the front-rear direction (see FIGS. 3 and 4).

The mechanical chassis base plate 13 is attached to the mechanical chassis mold portion 12 so as to close the lower surface thereof as described above, and the disk rotation drive mechanism 10 is provided in the first half thereof, and in the latter half thereof. Are the head support mechanism 6, the head transfer mechanism 8, and the head loading mechanism 9
However, at the right rear of the disk rotation drive mechanism 10, F
Eject mechanism 1 for ejecting D cartridge 11
5 is located behind the eject mechanism 15 and to the right of the head transfer mechanism 8, and a head retracting mechanism 16 for retracting the head support mechanism 6 when the FD cartridge 11 is ejected is located to the left of the head transfer mechanism 8. Is a head collision prevention mechanism 1 for preventing the magnetic heads 5 and 5 from moving when a large impact is applied during unloading of the magnetic heads 5 and 5 to prevent collision with the magnetic disk 7.
7 are provided (see FIGS. 2, 3, and 4).

The disk rotation drive mechanism 10 has a spindle motor 18 and a disk table 19 fixed to a motor shaft of the spindle motor 18. The spindle motor 18 is a motor formed on the front half of the mechanical chassis base plate 13. It is fixed in the state fitted in the arrangement hole.

The head support mechanism 6 supports two upper and lower magnetic heads 5 and 5 (only one is shown in the drawing), and each of the head arms 20 and 20 (only one is shown in the drawing).
And a carriage 2 supporting the rear ends of the head arms 20 and 20 and moved in the front-rear direction by the head transfer mechanism 8.
1 (see FIGS. 3 and 4). The head support mechanism 6 has a pair of magnetic heads 5 and a head arm 20 which are arranged vertically with substantially the same structure, so that the magnetic disk 7 is sandwiched between the upper magnetic head 5 and the lower magnetic head 5. Has become.

The head transfer mechanism 8 is provided on the mechanical chassis base plate 13 and has the disk rotation drive mechanism 1 mounted thereon.
0, and a main guide shaft 22 and a sub guide shaft 23 that support the carriage 21 movably in the front-rear direction.
A linear motor unit 24 for linearly moving the magnetic heads 5, 5 supported by the head support mechanism 6 via the carriage 21 in the radial direction of the magnetic disk 7 (see FIGS. 3 to 7).

The carriage 21 has a substantially rectangular shape in a plan view, and is provided with two bearings (not shown) slidably supported by the main guide shaft 22 in the front-rear direction on the left edge thereof, and on the right side. One bearing (not shown) slidably supported by the sub guide shaft 23 is provided at a portion formed in a tongue-like shape in which the rear end of the edge protrudes rightward.

The head loading mechanism 9 acts on the cantilever arms 25, 25 provided at the distal ends of the head arms 20, 20 of the head support mechanism 6, and acts on the cantilever arms 25, 25 to move them up and down. (See FIGS. 3 and 4).

During head loading, the carriage 21 is moved forward by the head transfer mechanism 8 so that the cantilever arms 25, 25 slide down on the lifter 26 so that the two magnetic heads 5, 5 approach. It is deviated to land on the magnetic disk 7. After the magnetic heads 5, 5 land on the magnetic disk 7, the magnetic heads 5, 5 are transferred in the radial direction of the magnetic disk 7 as the carriage 21 moves. Also,
At the time of head unloading, the carriage 21 is moved rearward by the head transfer mechanism 8, and the cantilever arm 2 is moved.
5 and 25 are mounted on a lifter 26 so that the two magnetic heads 5
To take off from.

The eject mechanism 15 includes an eject lever 27, a slide plate 28 formed integrally with the eject lever 27 and slidably supported on the mechanical chassis base plate 13, and is disposed behind the slide plate 28. A trigger arm 29 for pressing the FD cartridge 11 in the ejecting direction (forward).

The slide plate 28 is a torsion coil spring 3
0 and the FD cartridge 11
In the unloaded state, the slide plate 28 and the eject lever 27 are located at the forefront ends of the respective moving ranges, and the eject lever 27 is in a state of protruding forward from the mechanical chassis mold portion 12 (see FIG. 4). (See FIG. 3).

The trigger arm 29 is biased so as to rotate in a direction opposite to the clockwise direction when viewed from above, and when the FD cartridge 11 is unloaded (not loaded), its arm portion is set. When the FD cartridge 11 is loaded (loading state), the trigger arm 29 is pushed by the FD cartridge 11 and the trigger arm 29 is biased. The arm 29a is rotated clockwise against the resilience of the means so that the arm 29a extends in the left-right direction (see FIG. 4).

When the arm 29a of the slide plate 28 and the trigger arm 29 extend in the left-right direction (see FIG. 4), the slide plate 28 moves forward and 29 prevents rotation of the trigger arm 29 in the opposite direction to the clockwise direction, and allows the trigger arm 29 to rotate when the slide plate 28 is moved backward.
The structure is such that the forward movement of the slide plate 28 is prevented when 9a is inclined at 45 degrees (see FIG. 3). Such a structure is the same as that employed in the disk drive shown in the above-mentioned “Prior Art” in the Japanese Patent Application No. 320220/1999.

The trigger arm 29 opens the shutter when the FD cartridge 11 is loaded into the disk drive 1, and closes the shutter when the FD cartridge 11 is unloaded.

The head retracting mechanism 16 is a mechanism for retracting the magnetic heads 5, 5 in accordance with the ejecting operation of the FD cartridge 11, and is slidably supported by the sub guide shaft 23 and moves in conjunction with the eject lever 27. When the eject lever 27 is pushed in (when an eject operation is performed), the retract block 31 is moved backward, and the carriage 21 is retracted backward. The specific configuration of the head retracting mechanism 16 is the same as that employed in the disk drive device disclosed in the above-mentioned “Prior Art” in the 1999 Patent Application 320245.

The head collision preventing mechanism 17 is disposed on the left side of the main guide shaft 22 and slightly behind the central portion in the front-rear direction, and acts on the carriage 21 to move in the front-rear direction. Lock weight 32 that regulates
And the lock weight 32 provided on the carriage 21.
Pressing claw 33 locked by the
2 in one direction.

The lock weight 32 is made of a material having a relatively large specific gravity, and is formed of a deformed and slightly thick plate member which is formed by deforming a sector when viewed in a plane, and has a right-hand corner (hereinafter referred to as “pressed”). In the vicinity of 35, a long hole 36 extending obliquely to the left rearward is formed, and a guide pin 37 extending downward at a position obliquely rearward to the left on an extension in the extending direction of the long hole 36 is provided. A spring engaging piece 38 is formed on the right side edge of the elongated hole 36 at a position closer to the front of the elongated hole 36, to which one end of the extension coil spring 34 is locked. Note that the orientation of the lock weight 32 is based on the orientation in the state of FIGS. 3 and 6.

The lock weight 32 is rotated when the carriage 21 moves forward (moves in the head loading direction), as will be described later.
Slides when moving backward (moving in the head unloading direction).

The reason why the lock weight 32 is formed of a material having a relatively large specific gravity is that, when the lock weight 32 acts on the carriage 21 and a large impact is applied to the disk drive device 1 as will be described later, the carriage 21 is moved. This is to prevent movement and to reduce the size. Therefore, if the space for disposing the lock weight 32 can be increased, the specific gravity does not matter.

An edge 35 of the pressed portion 35 of the lock weight 32 facing obliquely right and rearward (hereinafter referred to as a “lock edge”) 35.
a is formed so as to be substantially orthogonal to an edge (hereinafter, referred to as a “pressed edge”) 35b facing diagonally forward right.
The pressed edge 35b is formed so as to be orthogonal to the direction in which the elongated hole 36 extends, and a corner between the edges 35a and 35b is formed in an R shape.

At a position of the mechanical chassis base plate 13 where the lock weight 32 is provided, a support shaft 39 that fits into the elongated hole 36 of the pressed portion 35 is provided upright. A substantially L-shaped guided hole 40 into which the shaft 3 is slidably fitted is formed.
A spring hook 41 is provided at a position closer to the front than 9 to lock the other end of the tension coil spring 34.

The guided hole 40 has a longer hole 40a.
Are formed in an arc shape centered on the support shaft 39, and the shorter hole 40b is formed so as to extend on an extension of the direction in which the long hole 36 of the lock weight 32 extends. Reference numeral 40b is substantially the same as the length of the long hole 36 formed in the lock weight 32.

The support shaft 3 of the mechanical chassis base plate 13
The distance between the guide hole 9 and the guide hole 40 is substantially the same as the distance between the left end of the elongated hole 36 of the lock weight 32 and the guide pin 37.

When the support shaft 39 of the mechanical chassis base plate 13 is fitted into the left end of the long hole 36 of the lock weight 32, the guide pin 37 of the lock weight 32 is inserted into the guided hole 40 of the mechanical chassis base plate 13. It fits into the longer hole 40a. The guided hole 4
The left end of the longer hole 40a of 0 is the shorter hole 4
0b.
It is referred to as a bent portion 40c of the guided hole 40.

Therefore, when the lock weight 32 is disposed on the mechanical chassis base plate 13 in this manner, the lock weight 32 is moved from the state where the support shaft 39 of the mechanical chassis base plate 13 is located at the left end of the elongated hole 36. The guide pin 37 is connected to the longer hole 4 of the guided hole 40 around the support shaft 39.
0a, and can be slid obliquely left rearward from the state where the guide pin 37 is located at the bent portion 40c of the guided hole 40. still,
The relationship between the guide pin 37 and the guided hole 40 may be reversed, that is, a guided hole may be formed in the lock weight 32, and the pin may be erected on the mechanical chassis base plate 13. Similarly, the relationship between the support shaft 39 and the elongated hole 36 may be reversed, that is, a support shaft may be provided upright on the lock weight 32 and the elongated hole may be formed in the mechanical chassis base plate 13.

Then, the lock weight 32 is disposed on the mechanical chassis base plate 13 as described above, and the tension coil spring 34 is stretched between the spring hook 38 of the lock weight 32 and the spring hook 41 of the mechanical chassis base plate 13. When the lock weight 32 is provided, a force for moving the lock weight 32 forward acts, whereby the support shaft 39 is positioned at the left end of the elongated hole 36, and the guide pin 37 is connected to the guided hole 40.
Is located at the bent portion 40c. This state is the reference state of the lock weight 32 (see FIGS. 3 and 6).

The pressing claw 33 is formed in the shape of a tongue protruding leftward at the front of the right edge of the carriage 21, and approximately 2/3 of the rear side of the front edge of the pressing claw 33 is It is formed on an inclined edge 33a that is deviated toward the base as it goes rearward, and the inclined edge 33a is formed so that the lock weight 32 is parallel to the pressed edge 35b in the reference state.

The lock weight 32 is arranged such that the pressed portion 35 is disposed in the movement locus of the pressing claw 33 of the carriage 21, and when the carriage 21 moves,
The pressing claw 33 presses the pressed portion 35 of the lock weight 32 from the front or the rear.

Next, the operation and function of the lock weight 32 accompanying the movement of the carriage 21 will be described. The operation and functions in a normal use state will be described first, and then the case where a large impact is applied to the carriage 21 will be described.

In a state where the carriage 21 is located at the rearmost end of the moving range (hereinafter referred to as a “retreat position”), the magnetic heads 5 and 5 are in a head unloaded state, and the pressed portion of the lock weight 32 is pressed. The pressing claw 33 of the carriage 21 is positioned behind the 35, and the inclined edge 33a of the pressing claw 33 abuts against the lock edge 35a of the pressed portion 35 from behind (see FIG. 6).

In this state, the lock weight 32 is pulled forward by the tension coil spring 34, but the oblique left rear edge of the long hole 36 contacts the support shaft 39 to prevent its movement. In this state, the pressing claw 33 abutted on this cannot move forward unless the lock weight 32 is pushed away, and thus the carriage 2
Reference numeral 1 denotes a locked state (see FIG. 6). As a result, the carriage 21 does not move even if the disk drive device 1 receives a slight impact.

The carriage 21 can be moved to the retracted position by a method using the head transfer mechanism 8 or a method forcibly performed by the head retracting mechanism 16.

When the carriage 21 is located at the retracted position, the linear motor 24 of the head transfer mechanism 8 is moved.
When the carriage 21 is moved forward (moved in the head loading direction) by the drive of, the pressing claw 33 presses the lock edge 35a of the lock weight 32 abutting forward, and the lock weight 32 is pulled by the tension coil spring. Rotating clockwise around the support shaft 39 erected on the mechanical chassis base plate 13 against the pulling force of 34 (see FIG. 7).

At this time, the tension coil spring 34 pulls the spring hook 38 positioned almost in front of the support shaft 39 almost diagonally forward right.
Is rotated about the support shaft 39, the linear motor portion 24 of the head transfer mechanism 8 can rotate the lock weight 32 with a small thrust, and the carriage 21
The lock by the lock weight 32 can be easily released. In order to strengthen the locked state of the carriage 21 at the retracted position, the direction in which the lock weight 32 of the tension coil spring 34 is pulled may be easily changed by slightly inclining the front direction or increasing the pulling force. Can be.

Then, the pressing claw 33 slides along the locking edge 35a of the rotating lock weight 32 and moves to the pressed portion 3
5, the lock weight 32 is returned to the reference state by the elastic force of the extension coil spring 34 (FIG. 8).
reference).

The pressed portion 35 when the pressing claw 33 moves forward.
Is moved forward by the pressing claw 33 and the pressed portion 3
5, the contact between the two (the pressing claw 33 and the pressed portion 35) has been performed for a relatively long time, and the carriage 21 has not been moved until the overcoming is completed. Is relatively large.

At the same time when the pressing claw 33 is completely over the lock weight 32, the head arms 20, 2
The magnetic heads 5, 5 supported by the head 0 perform head landing on the magnetic disk 7 by the head loading mechanism 9. Magnetic heads 5, 5
Is performed in the outermost part of the recording area of the magnetic disk 7, but the disk drive 1
In this case, since the area to be reproduced first after the head landing is the inner peripheral portion, the magnetic heads 5 and 5 are not energized immediately after the head landing is performed.

The pressing claw 33 is attached to the lock weight 32.
At the moment when the carriage 21 is separated from the pressed portion 35, the regulation of the carriage 21 is released from the lock weight 32, and the carriage 21 is moved from the position shown by the solid line in FIG. 8 to the position of the carriage 21 shown by the one-dot chain line in FIG. Can be moved freely. Such a moving range is a head scanning range of the magnetic heads 5 and 5.

Next, the unloading operation of the magnetic heads 5, 5 will be described. Incidentally, there are two methods for head unloading, and one is for the head transfer mechanism 8.
The other is a method in which the carriage 21 is moved backward by driving the linear motor unit 24, and another method is a method in which the carriage 21 is forcibly moved backward by the head retracting mechanism 16.
In any case, the carriage 21 is still moved to the retreat position.

Then, the carriage 21 is moved to the magnetic head 5,
When moved backward from the head scanning range of 5,
The inclined edge 33a of the pressing claw 33 collides with the pressed edge 35b of the pressed portion 35 of the lock weight 32 (see FIG. 9). The position of the carriage 21 is located behind the position of the carriage 21 indicated by the solid line in FIG.

At this time, the inclined edge 33a and the pressed edge 35b
Are formed at the same inclination angle, so that both edges (inclined edge 3
The line 3a and the pressed edge 35b) are in line contact (strictly, they are in surface contact because of their thickness). As a result, the rearward moving force of the pressing claw 33 acts on the pressed edge 35b as a component force diagonally left rearward. The lock weight 32 has a long hole 3
The direction in which the guide hole 6 extends and the direction in which the shorter hole 40b of the guided hole 40 of the mechanical chassis base plate 13 extends are both diagonally rearward to the left, and therefore, the lock weight 32 is moved diagonally rearward to the left ( (See FIG. 10).

As described above, the inclined edge 33a and the pressed edge 33a extend in the direction in which the elongated hole 36 of the lock weight 32 extends and the direction in which the shorter hole 40b of the guided hole 40 of the mechanical chassis base plate 13 extends. Since the portions 35b are formed so as to be orthogonal to each other, the direction of the component force acting on the pressed edge 35b coincides with the direction in which the elongated hole 36 and the shorter hole 40b extend, so that a loss of force can be reduced.

When the pressing claw 33 slides over the lock edge 35a of the sliding lock weight 32 and gets over the pressed portion 35, the lock weight 32 is
With the resilience of 4, it is returned to the above standard condition,
The carriage 21 is located at the retracted position (see FIG. 11).

The pressed portion 35 when the pressing claw 33 is retracted.
The movement of the pressing claw 33 to the rear and the pressed portion 3
5, the contact state between the two (the pressing claw 33 and the pressed portion 35) is relatively short, and the amount of movement of the carriage 21 until the overcoming is completed. Is relatively small.

As a result, the entire moving range of the carriage 21 can be reduced, which contributes to the downsizing of the head transfer mechanism 8 and the downsizing of the disk drive device 1.

That is, since the carriage 21 moves by pushing the lock weight 32 away, the lock weight 32 may be rotated at the time of head unloading as well as at the time of head loading.
In order to rotate the carriage 2 in the direction opposite to the clockwise direction, the carriage 21 must be largely moved rearward, and the head transfer mechanism 8 must be correspondingly enlarged, as in this embodiment. In addition, the sliding stroke of the carriage 21 can be reduced by sliding the lock weight 32 diagonally rearward to the left during head unloading.

Next, the state of the lock weight 32 and the carriage 21 when a large impact is applied when the carriage 21 is at the retracted position, for example, when the disk drive device 1 is dropped will be described. Before that, the objects (the carriage 21, the head arms 20, 2) which are moved by the head transfer mechanism 8 together with the carriage 21.
0, the magnetic heads 5, 5, etc.) (hereinafter, referred to as a "transfer body") 42 and the positional relationship, mass, and the like of the lock weight 32 will be described.

The carriage 21, the head arms 20, 2
0, the total mass of the transfer bodies 42 such as the magnetic heads 5, 5, etc.
c, and the mass of the lock weight 32 is Ww.

When the carriage 21 is at the retracted position,
The pressing claw 33 is a lock edge 35 a of the lock weight 32.
The point in contact with the point A, the center of the support shaft 39 is the point O, the center of gravity of the lock weight 32 is the point G, and the distance between the point O and the point A in the left-right direction is Lc. Let Lw be the distance in the left-right direction.

When the disk drive device 1 is dropped by mistake, the force acting on the carriage 21 due to the drop causes the lock weight 32 to rotate clockwise (moment Mc) and the lock weight 32
When a force (moment Mw) by which the lock weight 32 itself tries to rotate in the opposite direction to the clockwise direction is compared with a force (moment Mw) in which the lock weight 32 itself tries to rotate in the opposite direction from the clockwise direction (Mw). > Mc), the carriage 21 does not move forward, so that the magnetic heads 5, 5
Landing can be prevented.

That is, when the carriage 21 is in the retracted position, the carriage 21 does not move forward unless the lock weight 32 rotates, so that the magnetic heads 5, 5
Does not land on the magnetic disk 7.

More specifically, when a force in the forward direction is generated on the carriage 21 by dropping, the mass Wc of the transfer body 42 such as the carriage 21, the head arms 20, 20, and the magnetic heads 5, 5 is changed by the pressing claw 33. Acting on the contact point A with the lock weight 32, the lock weight 32 is moved to the center O of the support shaft 39.
A moment Mc (moment by the carriage 21) is generated to rotate clockwise around the point. On the other hand, the mass Ww of the lock weight 32 itself due to the drop generates a moment Mw (moment by the lock weight 32) for rotating the lock weight 32 in the counterclockwise direction about the center O point of the support shaft 39. I do.

Therefore, by setting the relationship between the two moments Mc and Mw such that Mw> Mc, the lock weight 32 does not rotate, the carriage 21 does not move forward, and the magnetic heads 5 and 5 move. There is no inadvertent landing on the magnetic disk 7.

Here, Mw = Ww × Lw, Mc = Wc ×
Therefore, it is preferable to design the shape of the lock weight 32 as follows. 1) Increase the mass Ww of the lock weight 32. 2) Left-right direction between the center of gravity G of the lock weight 32 and the O point of the support shaft 39. 3) The distance in the left-right direction between the point A where the pressing claw 33 acts and the point O of the support shaft 39 is reduced.

As described above, by designing the lock weight 32, a large shock such as a drop
Even if it is 1, the magnetic heads 5 can be prevented from moving and landing on the magnetic disk 7 carelessly. In addition to the above-mentioned design of the lock weight 32, it is of course effective to reduce the mass Wc of the transfer body 42 such as the carriage 21.

Thus, in the disk drive device 1 provided with the head collision preventing mechanism 17 as described above, the pressing claw 33 pushes the lock weight 32 away by the driving force of the linear motor unit 24 during normal operation. The carriage 21 can be moved forward from the retracted position, and when a large impact such as a drop is applied, the moment Mw due to the lock weight 32 exceeds the moment Mc due to the carriage 21 to prevent the carriage 21 from moving forward. Thus, it is possible to prevent the magnetic heads 5 and 5 from landing on the magnetic disk 7 carelessly.

In addition, the specific shapes and structures of the respective parts shown in the above embodiments are merely examples of the embodiment of the present invention, and the technical features of the present invention are not limited thereto. The scope should not be construed as limiting.

[0081]

As apparent from the above description, the disk drive of the present invention has a head transfer mechanism for transferring the magnetic head in the radial direction of the magnetic disk, and a large impact is applied when the magnetic head is unloaded. A head drive mechanism is provided with a head collision prevention mechanism for preventing a magnetic head from colliding with a magnetic disk when a carriage of the head transfer mechanism does not move. A guide shaft that slidably supports the carriage, and a linear motor unit that drives the carriage to move the magnetic head in the radial direction of the magnetic disk, and the head collision prevention mechanism has a predetermined mass. A lock weight is rotatably provided near the carriage, and locks in a movement locus of a part of the carriage. A part of the weight is positioned, and the lock weight rotates by allowing the carriage to move in the head loading direction to allow the carriage to move, and the lock weight rotates from the center of gravity (G) of the lock weight. The distance (Lw) in the direction perpendicular to the direction of movement of the carriage to the center (O) and the direction perpendicular to the direction of movement of the carriage from the contact portion (A) of the lock weight with the carriage to the center of rotation (O) of the lock weight. The relationship with the distance (Lc) in the moving direction is as follows: When the mass of the lock weight is Ww and the mass of the transfer body moved by the head transfer mechanism is Wc, Ww × Lw> Wc ×
Lc.

Therefore, in the disk drive device of the present invention, when the carriage is moved from the unload position to the head loading direction in a normal state, a part of the lock weight is pressed, and the lock weight is rotated to be pushed and receded. Can move forward, move the magnetic head to the head scanning area, and when a large impact is applied, the lock weight attempts to rotate in a direction opposite to the direction in which the lock weight itself is rotated by the carriage. By doing so, it is possible to prevent the carriage from moving in the head loading direction, and therefore, even if the disk drive device is dropped while the disk-shaped recording medium is loaded in the disk drive device, the magnetic head can be prevented from moving. It does not move in the loading direction, and the head landing Without, it is possible to prevent damage to the magnetic head and / or disk surfaces.

According to the second aspect of the present invention, the lock weight is slidably supported in a direction away from the carriage. When the carriage moves in the head unloading direction, the carriage slides the lock weight to move the carriage. , The movement stroke of the carriage in the unloading direction can be reduced, the head transfer mechanism can be downsized, and the disk drive can be downsized. Can be.

According to the third aspect of the present invention, the inclined edge of the pressing claw that comes into contact with the lock weight when the carriage moves in the unloading direction and the pressed edge of the pressed portion of the lock weight pressed by the inclined edge. Are formed so as to be orthogonal to the sliding direction of the lock weight, so that the direction of the component force acting on the pressed edge coincides with the sliding direction of the lock weight, so that a loss of force can be reduced.

[Brief description of the drawings]

FIG. 1 shows a disk drive device of the present invention using PCMC.
This is applied to an IA standard PC card type disk drive, and is a perspective view of a state where the disk drive and the FD cartridge are taken out from a PC card slot.

FIG. 2 is a perspective view showing an exploded state of the disk drive device.

FIG. 3 is a plan view showing a state in which a top cover is removed together with FIG. 4, and FIG. 3 shows an unloaded state (ejected state) of the FD cartridge.

FIG. 4 shows a cartridge loading state.

FIG. 5 is an enlarged exploded perspective view showing a head collision prevention mechanism.

FIG. 6 is an enlarged plan view for explaining the operation of the head collision prevention mechanism together with FIGS. 7 to 11, and shows a state where the carriage is at a retracted position.

FIG. 7 shows a state in which the carriage has started to move forward by pushing away the lock weight (head loading state).

FIG. 8 shows a state in which the carriage has pushed back the lock weight and is located in front of the carriage, and the lock weight has returned to the reference state.

FIG. 9 shows a state in which the carriage collides with the lock weight from the front in the head unloading state.

FIG. 10 shows a state in which the carriage is retreating by pushing away the lock weight in the head unloading state.

FIG. 11 illustrates a state in which the carriage has retreated to the retracted position in a state where the head unloading has been completed.

FIG. 12 is an enlarged plan view for explaining a force applied to a lock weight and a carriage when an impact is applied.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Disk drive device, 5 ... Magnetic head, 7 ... Magnetic disk, 8 ... Head transfer mechanism, 17 ... Head collision prevention mechanism, 21 ... Carriage, 22 ... Main guide shaft (guide shaft), 23 ... Sub guide shaft (guide) Axle), 24: linear motor part, 32: lock weight, 33: pressing claw (carriage), 33a: inclined edge, 35: right corner (pressed part),
35b: pressed edge, point A: action point, point O: rotation center, G
Point: center of gravity, Ww: mass of lock weight, Wc: total mass of moving object, Lw: distance between point A and point O, Lc: point G and O
Distance to point

Claims (3)

[Claims] A head transfer mechanism for transferring the magnetic head in a radial direction of the magnetic disk; and a magnetic head for moving the magnetic head so that the carriage of the head transfer mechanism does not move when a large impact is applied when the magnetic head is unloaded. A disk drive device provided with a head collision prevention mechanism for preventing collision with the head, wherein the head transfer mechanism includes a carriage supporting the magnetic head, a guide shaft slidably supporting the carriage, and a carriage. A linear motor section for driving the magnetic head to move in the radial direction of the magnetic disk. The head collision prevention mechanism comprises a lock weight having a predetermined mass provided rotatably near the carriage. The pressed portion of the lock weight is located in the movement locus of the pressing claw formed on the carriage, and When the carriage moves in the head loading direction due to movement, the lock weight is rotated to allow the carriage to move, and the distance from the center of gravity (G) of the lock weight to the rotation center (O) of the lock weight is changed. The distance (Lw) in the direction perpendicular to the moving direction of the carriage and the distance (Lc) in the direction perpendicular to the moving direction of the carriage from the contact portion (A) of the lock weight with the carriage to the rotation center (O) of the lock weight. Wherein the relation Ww × Lw> Wc × Lc is satisfied, where Ww is the mass of the lock weight and Wc is the total mass of the transfer body moved by the head transfer mechanism. Drive device. The lock weight is slidably supported in a direction away from the carriage, and when the carriage moves in the head unloading direction, the carriage slides the lock weight to allow the carriage to move. The disk drive device according to claim 1, wherein: 3. An edge of a pressing claw that contacts a lock weight when the carriage moves in an unloading direction (hereinafter, referred to as a “claw”).
It is called "inclined edge." 3. The disk drive device according to claim 2, wherein the pressed edge of the lock weight pressed by the inclined edge is formed so as to be orthogonal to the sliding direction of the lock weight.