JP2002367314A - Magnetic disk unit and disk cartridge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To minimize damage from the collision of a disk and a ramp head when impact is applied to a magnetic disk unit such as an HDD (hard disk drive). SOLUTION: The magnetic disk unit is so constituted that a ramp load 151 of a ramp load mechanism 41 to retract a magnetic head outside the disk 33 can retract in the direction of being away from the disk surface when the disk 33 is in idle state. Since the ramp load 151 can be released in the direction that the disk 33 is pressing even when the disk 33 wobbles and collides with the ramp load 151 by the acceleration when a impact, etc., is applied, a large load to the disk 33 and the ramp load 151 can be prevented and the risk of damage to the disk 33 and the ramp load 151 can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a magnetic disk drive such as a hard disk drive. The present invention also relates to a cartridge type magnetic disk device in which a mechanical system including a disk of the magnetic disk device is separated from at least a circuit board to enable a replacement operation, and a disk cartridge thereof.

[0002]

2. Description of the Related Art In recent years, as a hard disk drive (hereinafter, referred to as an HDD) detachable from a device bay of a host device main body such as a personal computer, a mechanical system such as a disk therein, a disk drive mechanism, a head arm actuator, etc. A cartridge-type HDD is made independent from the circuit board, a holder with the main circuit board is fixed in the device bay of the host device main body, and a cartridge with the above-mentioned mechanical system can be attached to and detached from this holder. is there.

It is generally known that the product life of an HDD is substantially determined by the life of a mechanical system. Therefore, if only the mechanical system of the HDD is made independent and only the cartridge equipped with this mechanical system can be replaced, only a small number of parts need to be replaced, reducing the cost of replacing the HDD and realizing resource saving. It becomes possible to do. Known technologies relating to such a cartridge type HDD include:
For example, there is JP-A-2001-084734.

[0004]

However, in recent years, HDDs
Adopts a load / unload method. This load / unload method is used when the disk is stopped.
The magnetic head is retracted to the outside of the disk, and the magnetic head is mounted on an inclined plate called a ramp load waiting on the outside of the medium and held thereon. The load / unload method has an advantage that the slider and the disk are less worn because the magnetic head does not contact the disk.

However, in order to realize a smooth movement of the head between the disk and the ramp load, usually, the leading end portion of the ramp load is arranged so that its plane overlaps the disk, and the gap therebetween is approximately 0.
Only a very narrow distance of about 2 mm can be secured. For this reason, when an impact or the like is applied, the disc and the ramp load collide, and there is a risk that both of them may be damaged or deformed. Deformation of the ramp road can lead to fatal accidents, such as causing head loading errors.

The present invention has been proposed in view of the above circumstances, and has as its object to provide a magnetic disk drive and a disk cartridge having excellent shock durability. It is an object of the present invention to provide a magnetic disk device and a disk cartridge that can minimize damage caused by collision between a disk and a ramp load.

[0007]

In order to achieve the above-mentioned object, a magnetic disk drive according to the present invention comprises a disk drive mechanism for supporting and driving a magnetic disk, and recording and reading signals on and from the magnetic disk. A head moving mechanism for supporting a magnetic head for performing the movement in the radial direction of the magnetic disk; and a ramp mechanism for retracting the magnetic head from the surface of the magnetic disk when the magnetic disk is not driven. However, a member having a ramp for guiding the magnetic head between the surface of the magnetic disk and the retracted position, and a member having the ramp can be retracted in a direction away from the recording surface of the magnetic disk. And supporting means for supporting.

Further, in the magnetic disk drive according to the present invention, the support means biases the component having the inclined path so as to automatically return to a fixed position from a retracted position separated from a recording surface of the magnetic disk. The urging member further comprises:

According to the magnetic disk drive of the present invention, even if the disk swings due to acceleration when an impact or the like is applied and collides with a member having a ramp of the ramp mechanism, the disk is pressed by the disk at that time. As a result, the disc and the ramp mechanism can be prevented from being subjected to a large load by escaping in the opposite direction, and the risk of damage to the disc and the ramp mechanism can be reduced. Also. After the member having the above-mentioned ramp has escaped due to the interference with the disk, the member automatically returns to the home position for loading / unloading the magnetic head by the urging force of the urging means. Can function.

[0010]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIGS. 1 and 2 are perspective views showing the overall configuration of a cartridge type magnetic disk drive according to an embodiment of the present invention.

As shown in these drawings, the magnetic disk drive 1 includes a disk cartridge 2 and a cartridge holder 3 capable of storing the disk cartridge 2.
It is composed of

The disk cartridge 2 includes a magnetic disk (hereinafter, simply referred to as a disk), a disk drive mechanism for driving the disk to rotate, a head arm actuator 37 for supporting the magnetic head and moving the disk in the radial direction of the disk. The voice coil motor for driving the head arm actuator 37 is provided with components other than a magnetic circuit. As the disk, for example, a disk using a plastic substrate as a base substrate is used. Of course, a substrate other than a plastic substrate, for example, a glass substrate may be used.

The cartridge holder 3 has a connector for making an electrical connection between the disk cartridge 2 and the host device, a function for controlling a motor and a magnetic head, processing data, and processing data input / output with the host device. And a magnetic circuit of a voice coil motor for driving the head arm actuator 37.

[1. Details of cartridge holder 3]

The cartridge holder 3 can be mounted in a 3.5-inch device bay of a host device main body such as a personal computer, and has an external connector (not shown) connected to a signal connection portion on the host device main body side. It has a power supply connector (not shown) connected to a power supply connection on the host device body side.

The cartridge holder 3 has a front panel 11 made of resin and exposed to the front side when inserted into the device bay of the host apparatus main body. The front panel 11 has a cartridge into which the disk cartridge 2 can be inserted and removed. An insertion slot 13 and the like are provided.

Inside the cartridge holder 3, an internal connector 15 for making an electrical connection including a signal line and a power supply to the disk cartridge 2 and a top yoke with a magnet constituting a magnetic circuit of a voice coil motor are provided. 17 and a bottom yoke 19 with a magnet. Magnets 18 are fixed to opposing surfaces of the top yoke 17 and the bottom yoke 19 by bonding.

The circuit board 23 is detachably mounted on the bottom of the cartridge holder 3 by screws (not shown).

[2. Details of Disk Cartridge 2]

(2.1 Overall Configuration)

FIG. 3 is an exploded view of the disk cartridge 2.
FIG. 4 shows a top cover 45 of the disc cartridge 2.
FIG. 5 is a cross-sectional view of the disc cartridge 2.

Aluminum chassis 3 serving as a base
1, a spindle motor (SPM) 35 as a disk drive mechanism for fixing the disk 33 and rotating the disk 33, a head arm actuator 37 supporting a magnetic head such as a GMR head, and the head arm actuator A moving coil 39 of a voice coil motor for moving the disc 37 in the radial direction of the disc;
(Rampway) A mechanism such as a load mechanism 41 is mounted.

The mechanical mounting surface of the chassis 31 is covered with a top cover 45 made of, for example, aluminum and fixed to the chassis 31 by fastening means such as a plurality of screws 38. The chassis 31 and the top cover 45 are designed so as to overlap each other except for a part of their outer edges, and a sealing material 44 made of, for example, fluorine rubber is disposed between the end surfaces of the overlapping outer edges. Hereinafter, the combination of the chassis 31 and the top cover 45 is referred to as a “cartridge housing”.

On the back side of the chassis 31, the internal connector 15 of the cartridge holder 3 and the disk cartridge 2
Connector module 43 for making an electrical connection with the inside
Is installed.

A part of the side wall of the cartridge housing is opened to allow the movable coil 39 of the voice coil motor to protrude. The opening 42 has an internal space allowing the protruding movable coil 39 to rotate. A coil cover 51 having a packing material 2 made of, for example, fluorine rubber
It is fixed by a fastening means such as a plurality of screws 48 through 5. The thickness of the coil cover 51 is smaller than the thickness of the disk cartridge 2, and is designed such that an optimal distance between each of the magnets 18 of the top yoke 17 and the bottom yoke 19 fixed to the cartridge holder 3 and the movable coil 39 is ensured. Have been.

On both sides of the long side of the cartridge housing, recesses 51, protruding left and right ends of the disk 33 are provided.
52 are opened left and right symmetrically, and adapter parts 53, 54 provided with recesses 53a, 54a for avoiding interference with the protruding disk 33 are provided in the left and right depressions 51, 52, respectively. It is fixed by fastening means such as a plurality of screws 56 in between. The left and right depressions 51, 52 are formed by these adapter parts 53, 54.
The both sides of the disc cartridge 2 are flattened by being embedded in the disc cartridge 2. The adapter parts 53 and 54 contribute to reducing the width of the entire cartridge housing.

The above chassis 31, top cover 45,
The entire casing of the disc cartridge constituted by the coil cover 51, the adapter parts 53, 54 and the like has a sealed structure, and the sealed casing internal space has a dry atmosphere from which at least moisture is removed, more preferably. It is covered with an inert gas atmosphere such as dry nitrogen gas.

(2.2 Separation Structure of Voice Coil Motor)

In this embodiment, the magnet 18 and the yokes 17, 1, which are magnetic circuits for a voice coil motor, are used.
9 is arranged on the cartridge holder 3 side and is independent of the movable portion of the voice coil motor on the disk cartridge 2 side.

As shown in FIG. 6, when the disk cartridge 2 is inserted into the cartridge holder 3, the portion of the coil cover 51 covering the movable coil 39 for the voice coil motor mounted on the disk cartridge 2 is replaced with the cartridge. Top yoke 17 with magnet and bottom yoke 1 with magnet provided in holder 3
9 between the respective magnets 18.

The disk cartridge 2 is inserted into the cartridge holder 3 until the tips 17a, 19a of the top yoke 17 and the bottom yoke 19 hit the side wall surface 51a of the coil cover 51.

As a result, the movable coil 39 for the voice coil motor is placed in the magnetic field formed by the magnetic circuit on the cartridge holder 3 side. The actuator 37 is driven.

(2.3 Head Arm Actuator 3)
Configuration of 7)

FIG. 7 shows the structure of the head arm actuator 37.

As shown in the figure, the chassis 31 has a hole 61 to which one end of a support shaft 59 of the head arm actuator 37 rotated by a voice coil motor is fixed by press-fitting. The other end of the support shaft 59 is provided with a screw hole 63 opened on the surface of the other end. A screw insertion hole 65 corresponding to the position of the screw hole 63 of the support shaft 59 is formed in the top cover 45, and the screw hole 63 of the support shaft 59 is inserted through the screw insertion hole 65 of the top cover 45.
By inserting and screwing a set screw 67 into the support shaft 5,
The other end of 9 is fixed to the top cover 45.

A pivot 71, which is the rotation axis of the head arm actuator 37, is fitted around the support shaft 59 via a bearing 69. The movable coil 39 for the voice coil motor and a pair of head arms 73 are attached to the pivot 71 by fastening means such as screws 75.

A gap is provided between the screw insertion hole 65 of the top cover 45 and the upper end of the screw hole 63 of the support shaft 59 over the inner periphery of the hole, and a seal member 77 such as an O-ring is provided in the gap. It is fitted. An inner ring 69a of a bearing 69 is externally fitted and fixed to the support shaft 59, and an upper end surface of the inner ring 69a of the bearing 69 is in contact with a lower end surface of the top cover 45. The joint between the upper end surface of the inner ring 69a of the bearing portion 69 and the lower end surface of the top cover 45 is sealed by the seal member 77, and airtightness between the screw hole portion and the inside of the disk cartridge 2 is achieved. I have. Further, the screw holes 63 of the top cover 45 are also sealed by a sheet-like sealing material 79.

As shown in FIG. 8, a suspension 81 is attached to the head of the head arm 73, and a slider 83 having a magnetic head is attached to the tip of the suspension 81. The suspension 81 plays the role of a spring that presses the slider 83 against the disk surface. A tab 85 that slides on a ramp for dynamic loading / unloading is provided at the tip of the suspension 81.
The ramp mechanism 41 is a mechanism for retracting the magnetic head to the outside of the disk 33 when the disk 33 is stopped.

(2.4 Configuration of Disk Drive Mechanism)

FIG. 9 shows the structure of the disk drive mechanism.
The chassis 31 is provided with a hole 89 into which a stator 87 of a spindle motor is fitted.
Are fixed to the chassis 31 by fastening means such as screws 91 and the like. Chassis 31
A step 93 is provided on the inner peripheral wall of the hole 89 into which the stator 87 is fitted. The step 93 has a sealing member 95 such as an O-ring for sealing a gap between the chassis 31 and the stator 87. Is arranged. A cylindrical portion 97 is provided coaxially at the center of the stator 87.
A rotating shaft 99 is rotatably supported inside the cylindrical portion 97 of the stator 87 via a hydrodynamic bearing 101. The hydrodynamic bearing 101 compresses a viscous fluid (oil or the like) 103 sealed on the peripheral surface of the rotating shaft 99,
The rotary shaft 99 is supported by utilizing the pressure (dynamic pressure) generated by this compression. In this embodiment, except for the lower part, the peripheral surface of the rotating shaft 99 and the stator 8
A slight gap is provided between the inner peripheral surface of the cylindrical portion 97 and the viscous fluid 103 is sealed in the gap. Further, a stator coil 105 is attached to the outer peripheral surface of the cylindrical portion 97 of the stator 87.

The rotor 107 is fixed to the rotating shaft 99. Specifically, the rotor 107 has a shaft hole 108, and the rotating shaft 99 is inserted through the shaft hole 108. A cylindrical portion 109 is provided coaxially around the outer periphery of the rotor 107. A ring-shaped magnet 111 is attached to the inner peripheral surface of the cylindrical portion 109 of the rotor 107 so as to face the stator coil 105 disposed on the outer peripheral surface of the cylindrical portion 97 of the stator 87.

Further, a flange portion 113 is formed on an outer peripheral portion of the cylindrical portion 109 of the rotor 107, and a ring-shaped disk holder 115 is provided outside the cylindrical portion 109 of the rotor 107.
Is fitted. The disc 3 is positioned between the lower end face of the disc holder 115 and the upper end face of the flange 113.
The disk 33 is fixed because the peripheral portion of the center hole 3 is sandwiched. Then, the rotor 107 and the disc holder 115 are connected to the rotating shaft 9 by a set screw 117.
9 are pressed down from above by a disc-shaped plate 119 fixed to them.

(2.5 Connector Structure)

As shown in FIG. 3, a connector module 43 for making an electrical connection between the internal connector 15 of the cartridge holder 3 and the inside of the disk cartridge 2 is mounted on the rear side of the chassis 31.

FIG. 10 shows how the connector module 43 is connected. The connector module 43 has a connector section 121 connected to the pin-connecting internal connector 15 of the cartridge holder 3 and a bellows-type contact structure connector header 125 connected to a socket 123 fixed to the chassis 31. I have. The bellows-type contact is a contact formed by bending a thin plate, and has a structure in which a bent surface of the plate contacts. The connector header 125 has a side surface substantially perpendicular to the surface of the module substrate 127, and a plurality of bellows-type contacts 129 are arranged on this side surface.

On the other hand, a socket hole 131 is provided in the chassis 31, and the socket 123 mounted on the flexible substrate 137 is fitted into the hole 131. A plurality of contacts 135 that are in contact with a plurality of bellows-type contacts 129 arranged side by side on the side surface of the connector header 125 are arranged on the inner wall surface of the socket 123. The flexible board 137 is fixed to an L-shaped reinforcing plate 133, and the other end of the flexible board 137 extending from a vertically erected portion of the reinforcing plate 133 has a movable coil 39 of a voice coil motor and a pair of flexible boards 137. The head of the head arm actuator 37 is connected.

A sealing member 139 such as an O-ring is disposed between the reinforcing plate 133 and the chassis 31.
The gap between the reinforcing plate 133 and the chassis 31 is sealed.

(2.6 Sealed Structure of Disk Cartridge 2)

In general, a hard disk drive is provided with a breathing hole for following a change in air pressure. In this disk cartridge 2, the atmosphere in the disk cartridge 2 is changed to an inert gas such as dry nitrogen gas from which moisture is removed. In order to maintain the atmosphere, a breathing hole is abolished, and the following seal structure for increasing the degree of sealing is employed.

A gap between the chassis 31 and the top cover 45, a gap between the cartridge housing and the coil cover 51, and a gap between the cartridge housing and the adapter parts 53 and 54 are sealed with a sealing material.

The upper end surface of the inner ring 69a of the bearing 69 in the head arm actuator 37 and the top cover 4
The gap at the portion where the lower end surface of the fifth member 5 comes into contact is sealed with a sealing material 44 such as an O-ring.

The gap between the reinforcing plate 133 and the chassis 31 is sealed with a sealing material 139 such as an O-ring.

All the screw holes formed in the top cover 45 are sealed with a sheet-like sealing material.

A sealing member 95 such as an O-ring for sealing a gap between the chassis 31 and the stator 87 is disposed on a step portion provided on the inner periphery of the hole of the chassis 31 into which the stator 87 is fitted.

(2.7 Reduction of Cartridge Width by Adapter Parts 53 and 54)

As shown in FIG. 11, the cartridge housing 1
Recesses 51 and 52 projecting from the left and right ends of the disc 33 are formed on the left and right side surfaces of the disc 41, respectively, in a symmetrical manner. Adapter parts 53, 54 provided with recesses 53a, 54a to be avoided are fixed by fastening means such as a plurality of screws 56 with packing materials 55, 57 interposed therebetween.

As shown in FIG. 12, both sides of the disk cartridge 2 are flattened by being embedded in the left and right depressions 51, 52 by these adapter parts 53, 54.

The adapter parts 53 and 54 contribute to reducing the width of the entire cartridge housing. The principle will be described below.

In FIG. 13, reference numeral 300 denotes a cartridge housing in which a chassis and a top cover overlap with each other at an outer edge thereof, and a seal member 344 is disposed between opposing surfaces of the outer edge. However, the sealing material 344 is also arranged at the left and right ends of the disk 33 in parallel with the disk surface. In such a configuration, a certain dimension is required for the seal width. Therefore, the width of the cartridge housing needs to be at least the size of the disk diameter + (seal width * 2). For example,
In the case of a 3.5-inch (95 mm) diameter disk, if a minimum of 3 mm is required for the seal width, the minimum width of the disk cartridge is 101 mm.

On the other hand, according to the seal structure using the adapter parts 53 and 54 according to the present embodiment, a necessary seal width can be ensured in the thickness direction of the disk cartridge 2. The desired seal width does not affect the width of the disk cartridge. An opening 55 for inserting the end of the disk 33 into the packing material 55, 57.
a, 57b (see FIG. 3) and open the adapter parts 53, 5
4 is a concave portion 53 for avoiding interference with the end of the disk 33.
With the provision of a and 54a, conditions for determining the distance from the left and right ends of the disk 33 to the end surface of the disk cartridge are relaxed, and as a result, the width of the disk cartridge can be reduced.

(2.8 Circuit Configuration)

FIG. 14 is a block diagram showing the circuit configuration of the cartridge type magnetic disk drive according to this embodiment.

As shown in the drawing, the circuit board 23 mounted on the cartridge holder 3 has an interface circuit 2
01 and the head arm actuator drive control circuit 20
3, the position control circuit 205, and the disk rotation control circuit 2
07 and a data processing circuit 209 are incorporated.

The interface circuit 201 exchanges various control signals and data with the host device.

The position control circuit 205 performs tracking servo of the head 211 based on the tracking error signal obtained from the output of the head 211. Also, a signal corresponding to the address specified by the host device is sent to the disk 33.
And the position of the head 211 is controlled so that a signal is written to an address specified by the host device or a signal is written to the address specified by the host device.

The head arm actuator drive control circuit 203 supplies a drive signal to the movable coil 39 of the voice coil motor based on the position control signal from the position control circuit 205 to drive the head arm actuator 37.

The disk rotation control circuit 207 sends a drive signal to the spindle motor 213 and controls the spindle motor 213 to rotate at a rotation speed suitable for recording and reproduction.

The data processing circuit 209 modulates the data supplied from the host device through the interface circuit 201 into a signal suitable for recording on the disk 33, and
11 or the head 311
3 is demodulated.

The head arm actuator drive control circuit 203, the disk rotation control circuit 207, and the data processing circuit 209 are connected to the movable coil of the voice coil motor in the disk cartridge 2 via the internal connector 15 of the cartridge holder 3, the connector module 43, and the like. 3
9, connected to the spindle motor 213 and the head unit 211.

Further, the cartridge holder 3 is provided with a magnetic circuit 215 (top yoke 17 with magnet and bottom yoke 19 with magnet) in the voice coil motor.

The circuit board 23 on which the above circuits are mounted is fixed to the cartridge holder 3 by, for example, screws or the like, and is detachable for replacing the board.

(2.9 Ramp Loading Mechanism 41)

Next, the details of the ramp load mechanism 41 in the cartridge type magnetic disk drive of this embodiment will be described with reference to FIGS. This ramp loading mechanism 41 is used when the disc 33 is stopped.
This is a mechanism for retracting the magnetic head to the outside of the disk 33.

FIG. 15 is a plan view of the ramp load mechanism 41, and FIG. 16 is a side sectional view thereof. As shown in these figures, the ramp load mechanism 41 includes a ramp load 151 having an inclined surface for guiding a tab 85 provided at the tip of the suspension 81 of the head arm 73 to and from the surface of the disk 33. Is provided. This ramp road 1
The inclined surface 51 is provided with an inclined portion 153 for floating the magnetic head to a position higher than the height of the surface of the disk 33 during unloading.
And a positioning portion 155 for positioning the tab 85 that has risen up the inclined portion 153 at a height lower than the top of the inclined portion 153 so as not to return, and an inclined portion 157 serving as a stopper for the tab 85 during unloading. Is done. Localization part 1
A tab retainer 159 that holds the tab 85 from above above the 55
Are provided, and the tab 8 can be moved from
5 is trying not to escape. A wall that is slightly higher than the inclined surface rises on one side of the inclined surface of the ramp road 151, and the tip of the tab 85 extends along the surface of the wall. A part of the tip end (disk side) of the ramp load 151 is arranged so that its plane overlaps the disk, and a gap of about 0.2 mm is provided between them.

The ramp load 151 thus configured
Are provided corresponding to the individual magnetic heads of the head arm 73. That is, a lamp base 161 is fixed to the chassis 31, and two ramp loads 151, 151 corresponding to the individual magnetic heads of the head arm 73 respectively have inclined surfaces on a shaft 163 fixed to the lamp base 161. It is rotatably supported on its back.

Each of the lamp loads 151, 151 is provided with a suction mechanism 169, 170 composed of, for example, a combination of a magnet and an iron piece. An urging force for closing the valve is constantly generated.

The lamp base 161 has two pins projecting in parallel with the shaft 163. One pin 165 is closer to the disk than the shaft 163 and the other pin 165 is.
7 is located on the opposite side. One of the pins 165 provided on the disk side of the shaft 163 interferes with the rear side surfaces near the ends of the upper and lower ramp loads 151 and 151, and the signal recording surfaces on the front and back of the disk 33 and the respective ramp loads 1.
This pin functions as a limiter for securing a predetermined gap (about 0.2 mm) between the pins 51 and 151. Also, the other pin 167 interferes with the rear side surface of the rear end portion of the upper and lower ramp loads 151, 151, and the respective lamp loads 151, 1 1
Reference numeral 51 denotes a pin functioning as a limiter when the shaft 163 is pivoted in a direction away from the signal recording surface on the front and back surfaces of the disk 33.

The ramp load mechanism 4 configured as described above
In 1, the upper and lower ramp loads 151, 151 are limited by the other pin 167 from a fixed position for loading / unloading the magnetic head, determined by one pin 165 disposed in front of the shaft 163. It is possible to rotate up to the set angular position while opposing the suction force of the suction means 169 and 170.

Therefore, as shown in FIGS. 17 and 18, even if the disk 33 oscillates and collides with the ramp load 151 by the acceleration when an impact or the like is applied, the disk 33 is pressed in the direction pressed by the disk 33 at that time. When the ramp load 151 escapes, the risk of receiving a large load on the disk 33 and the ramp load 151 to reduce damage can be reduced.

After the ramp load 151 escapes due to interference with the disk 33, the ramp load 151 is released by the suction mechanism 16.
Since the magnetic head automatically returns to the home position for loading / unloading by the suction force of 9, 170, the magnetic head can function normally as the ramp loading mechanism 41 thereafter.

In this embodiment, a combination of a magnet and an iron piece is used in order to automatically return the ramp load 151 that has escaped due to the interference with the disk 33 to a fixed position for loading / unloading the magnetic head. Adopting a suction mechanism, etc., the ramp load 15
A configuration may be adopted in which the first and the first 151 are biased so as to be always drawn together.

In the magnetic disk drive 1 having the above configuration, when the disk cartridge 2 is inserted from the cartridge insertion slot 13 provided in the front panel 11 of the cartridge holder 3, the disk cartridge is inserted into the internal connector 15 in the cartridge holder 3. The connector portion 121 provided on the second connector module 43 is coupled to the coil cover 51, and the portion of the coil cover 51 covering the movable coil 39 for the voice coil motor mounted on the disk cartridge 2 is disposed on the cartridge holder 3. Between the magnets 18 of the top yoke 17 with magnet and the bottom yoke 19 with magnet.

Thus, the movable coil 3 of the spindle motor and the voice coil motor in the disk cartridge 2
9 and the head are electrically connected to the circuit board 23 mounted on the cartridge holder 3, and the movable coil 39 for the voice coil motor is placed in a magnetic field formed by the magnetic circuit of the cartridge holder 3.
Is placed, and the drive of the disk, the drive of the head arm actuator 37, and the operation of the head become possible.

[0085]

As described above, according to the present invention,
The disk shakes due to the acceleration when an impact is applied,
Even when the member collides with the ramp member having the ramp, the member escapes in the direction pressed by the disc at that time, so that a large load is prevented from being applied to the disc and the ramp mechanism, and the disc and the ramp mechanism are damaged. Can reduce the risk of receiving Also. After the member having the above-mentioned ramp has escaped due to the interference with the disk, the member automatically returns to the home position for loading / unloading the magnetic head by the urging force of the urging means. Can function.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a state in which a disk cartridge is ejected in a cartridge type magnetic disk device according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a state where a disk cartridge is housed in the cartridge type magnetic disk device according to the embodiment of the present invention;

FIG. 3 is an exploded view of the disk cartridge in the cartridge type magnetic disk device according to the embodiment of the present invention.

FIG. 4 is a plan view of the disc cartridge shown in FIG. 3 with a top cover removed.

FIG. 5 is a sectional view of the disk cartridge shown in FIG. 3;

FIG. 6 is a sectional view showing a separation structure of a voice coil motor in the disk cartridge shown in FIG. 3;

FIG. 7 is a sectional view showing a configuration of a head arm actuator in the disk cartridge shown in FIG. 3;

FIG. 8 is a plan view showing a configuration of a head arm attached to the head arm actuator of FIG. 7;

9 is a cross-sectional view showing a configuration of a disk drive mechanism in the disk cartridge shown in FIG.

FIG. 10 is a sectional view showing a configuration of connection of a connector module in the disk cartridge shown in FIG. 3;

FIG. 11 is a plan view showing an adapter component having a sealing function attached to both left and right sides of the cartridge housing.

FIG. 12 is a plan view showing a state where an adapter component is attached.

FIG. 13 is a diagram for explaining the effect of reducing the cartridge width by the adapter part.

FIG. 14 is a block diagram showing a circuit configuration of a cartridge type magnetic disk drive according to an embodiment of the present invention.

FIG. 15 is a plan view showing a ramp load mechanism in the cartridge type magnetic disk drive according to the embodiment of the present invention.

16 is a side sectional view of the ramp load mechanism shown in FIG.

FIG. 17 is a side sectional view showing a state of a ramp load mechanism when a disk swings due to an impact.

FIG. 18 is a side sectional view showing a state of the ramp load mechanism when the disk is shaken by the impact.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Magnetic disk device, 2 ... Disk cartridge, 3 ... Cartridge holder, 31 ... Chassis, 33 ... Disk, 37 ... Head arm actuator, 41 ... ... ramp mechanism, 73 ... head arm, 81 ... suspension, 85 ... tab,
151 ··· Ramp road 153 ··· Inclined part 1
55 ··· Localized portion, 157 ··· Inclined portion, 159 ··· Tab holder, 161 ··· Lamp base, 163 ··· shaft
.. 169, 170... Suction mechanism, 165, 167.

Claims (5)

[Claims] A disk drive mechanism for supporting and driving a magnetic disk; a head moving mechanism for supporting a magnetic head for recording and reading signals on and from the magnetic disk so as to be movable in a radial direction of the magnetic disk; A ramp mechanism for retracting the magnetic head from the surface of the magnetic disk when the magnetic disk is not driven, wherein the ramp mechanism guides the magnetic head between the surface of the magnetic disk and a retracted position. And a supporting means for supporting the member having the ramp so as to be able to retract in a direction away from the recording surface of the magnetic disk. 2. A disk drive mechanism comprising: a cartridge holder mountable to a host device; and a disk cartridge detachable from the cartridge holder, wherein the disk cartridge supports and drives a magnetic disk; A head moving mechanism for supporting a magnetic head for recording and reading signals to and from a magnetic disk so as to be movable in a radial direction of the magnetic disk; and for retracting the magnetic head from a surface of the magnetic disk when the magnetic disk is not driven. A ramp mechanism for guiding the magnetic head between the surface of the magnetic disk and the retracted position, a member having a ramp, and moving the member having the ramp from a fixed position to a position of the magnetic disk. Support means for supporting the recording surface so that it can be retracted in a direction away from the recording surface Magnetic disk apparatus according to claim. 3. The magnetic disk drive according to claim 1, wherein the support unit automatically returns the component having the ramp from a retracted position separated from a recording surface of the magnetic disk to the fixed position. A magnetic disk drive comprising a biasing member for biasing the magnetic disk drive. 4. A disk cartridge detachably mountable to a cartridge holder mountable on a host device, comprising: a disk drive mechanism for supporting and driving a magnetic disk; and recording and reading signals to and from the magnetic disk. A head moving mechanism for supporting a magnetic head to be moved in a radial direction of the magnetic disk, and a ramp mechanism for retracting the magnetic head from the surface of the magnetic disk when the magnetic disk is not driven, and the ramp mechanism A member having a ramp for guiding the magnetic head between the surface of the magnetic disk and a retracted position, and the member having the ramp can be retracted from a fixed position in a direction away from the recording surface of the magnetic disk. And a supporting means for supporting the disk cartridge. 5. The disk cartridge according to claim 4, wherein said support means urges the component having the inclined path to automatically return to a home position from a retracted position separated from a recording surface of the magnetic disk. A disc cartridge having an urging member.