JP2002367362A - Magnetic disk device and disk cartridge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prolong a lifetime of a hard disk drive. SOLUTION: A disk cartridge 2 is made closed structure, the closed internal space is made dried atmosphere, preferably, the space is fill with inert gas such as dried nitrogen gas or the like. Dissolution of lubricant applied on a disk surface and oxidization of other parts can be prevented thereby, and a lifetime can be prolonged. Also, gas evaporated from an oil pool of a hydrodynamic bearing 101 is prevented to leak to the outside by housing the inside closing with almost atmospheric pressure, destruction of a bearing caused by deficiency of oil can be prevented and further prolongation of a lifetime of a device can be expected.

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, 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 has a disk, a disk drive mechanism, and a head arm actuator 3 therein.
The mechanical system such as 7 is made independent from the main circuit board and made into a cartridge, the holder with the main circuit board is fixed in the device bay of the host device body, and the cartridge with the above mechanical system is attached to and detached from this holder. There is a cartridge type HDD that has been made possible.

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 the mechanical system can be replaced, only the minimum necessary parts need to be replaced, the cost for replacing the HDD can be reduced, and further, resources are saved. Can be realized. Known technologies relating to such a cartridge type HDD include, for example, JP-A-2001-084734.

[0004]

Generally, for example, a fluorine-based lubricant is applied to the surface of an HDD disk in order to improve the slip between the disk surface and a magnetic head. Since the breathing hole is provided to keep the air pressure the same, the lubricant gradually decomposes when it comes into contact with atmospheric moisture, eventually losing its function as a lubricant and causing a disk crash .

In recent years, bearings for rotationally driving a disk have been shifting to fluid bearings that receive a shaft with a fluid such as oil in place of bearings using metal balls in response to demands for quietness and the like. is there. This fluid bearing has a wear-resistant bearing structure and contributes to a longer life of the HDD.
However, since the atmosphere constantly flows between the inside and the outside of the HDD through the above-mentioned breathing hole, gas volatilized from the oil reservoir of the bearing leaks outside through the breathing hole, and finally, the HDD is unable to operate due to the lack of oil. Has a fate leading to destruction.

The present invention has been proposed in view of the above circumstances, and aims at protecting the lubricant on the disk surface and suppressing the aging of oil in the fluid bearing.
It is an object of the present invention to provide a magnetic disk device and a disk cartridge that can extend the life.

[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 that mounts a magnetic head that performs the above operation and moves the head in the radial direction of the disk, and a sealed type that hermetically accommodates the disk drive mechanism and the head moving mechanism in an atmosphere where moisture is excluded at substantially atmospheric pressure. And a housing.

[0008] As an atmosphere from which moisture in the closed casing is excluded, an atmosphere using a dry inert gas, more specifically, an atmosphere using a dry nitrogen gas can be selected.

The lubricant on the disk surface is decomposed by contact with moisture, and eventually loses its function as a lubricant. Therefore, by placing the disk in an atmosphere from which water has been removed, the progress of deterioration and deterioration of the lubricant applied to the disk surface can be effectively delayed, and the life of the device can be extended. In addition, by setting the inside of the closed casing to the atmosphere of the dry inert gas, it is possible to prevent the decomposition of the lubricant and the oxidation of other materials, and it is possible to expect a further longer life of the apparatus.

In addition, since the disk drive mechanism and the head moving mechanism are hermetically housed at substantially atmospheric pressure, the interior of the sealed housing becomes the saturated vapor pressure of the oil of the fluid bearing, and thereafter the oil of the fluid bearing becomes Evaporation of oil from the pool can be prevented, and bearing destruction due to insufficient oil can be prevented.

[0011]

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 structure of a cartridge type magnetic disk drive according to an embodiment of the present invention.

As shown in these figures, the magnetic disk drive 1 comprises 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, and 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 apparatus main body such as a personal computer, and has an external connector (not shown) connected to a signal connection portion of the host apparatus main body. 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 resin front panel 11 which is exposed to the front side when inserted into a 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 the 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) or the like.

[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 for projecting the movable coil 39 of the voice coil motor. The opening 42 has an internal space allowing the projected 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 long sides of the cartridge housing, recesses 51, which protrude left and right ends of the disk 33,
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-mentioned 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 and 1 are magnetic circuits for a voice coil motor.
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 disc 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 disc 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 and 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 a 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 sealing 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 protecting an area where the magnetic head does not contact the disk surface when the magnetic head is not used, and is disposed outside the outermost track of the disk 33.

(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 the 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, on the rear side of the chassis 31, a connector module 43 for electrically connecting the internal connector 15 of the cartridge holder 3 and the inside of the disk cartridge 2 is mounted.

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 substrate 137 is fixedly fixed to an L-shaped reinforcing plate 133, and extends from a vertically erected portion of the reinforcing plate 133.
A movable coil 39 of a voice coil motor is
And the heads of a pair of head arm actuators 37 are 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 water 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 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 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 their outer edges, and a seal member 344 is arranged between opposing surfaces of the outer edges, which is different from this embodiment. 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 secured 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 a 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 the 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 board replacement.

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 2 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.

As described above, the magnetic disk device 1 and the disk cartridge 2 according to the present embodiment have an excellent hermetic structure. In addition, the sealed internal space is filled with a dry atmosphere from which moisture has been eliminated, and more preferably an inert gas atmosphere such as dry nitrogen gas. Can be prevented, and the life of the device can be extended.

Further, since the inside of the disk drive mechanism is hermetically sealed at approximately atmospheric pressure, the dynamic pressure bearing
The vaporized gas does not leak from the oil reservoir 1 to the outside. Therefore, the oil in the hydrodynamic bearing 101 is vaporized only during the period until the inside reaches the saturated vapor pressure of the oil. By selecting the oil amount in the oil reservoir in consideration of the oil amount corresponding to this slight vaporization, In addition, it is possible to prevent bearing destruction due to oil shortage, and it is possible to expect a longer life of the device.

[0078]

As described above, according to the present invention,
By covering the disk in the dry atmosphere, the progress of deterioration and deterioration of the lubricant applied to the disk surface can be effectively delayed, and the life of the device can be extended. In addition, by selecting an atmosphere using an inert gas such as dry nitrogen as the drying atmosphere, it is possible to prevent the decomposition of the lubricant and the oxidation of other materials,
A further life extension effect of the device life can be expected. Further, according to the present invention, the disk drive mechanism and the head moving mechanism are hermetically housed at substantially atmospheric pressure, so that the fluid inside the hermetically sealed housing after the saturated vapor pressure of the oil of the fluid bearing becomes Evaporation of oil from the oil reservoir of the bearing can be suppressed, and bearing destruction due to insufficient oil can be prevented.

[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.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Magnetic disk drive, 2 ... Disk cartridge, 3 ... Cartridge holder, 17 ... Top yoke, 18 ... Magnet, 19 ... Bottom yoke, 23 ... circuit board, 25 ... packing material, 3
1 ... chassis, 33 ... disk, 37 ... head arm actuator, 39 ... movable coil, 4
1 ····· Lamp mechanism 43 ···· Connector module
44 ··· sealing material, 45 ··· top cover, 51 · · ·
..Coil cover, 53,54..Adapter parts, 5
3a, 54a ... recess, 55, 57 ... packing material,
69 ··· Bearing part, 77 ··· Seal member, 79 ··· Seal material, 81 ··· Suspension, 83 ··· Slider, 85 ··· Tab, 87 ··· Stator, 95, seal member, 101, hydrodynamic bearing, 103, viscous fluid, 105, stator coil, 107, rotor, 111, magnet, 121 ··· connector part, 123 ··· socket, 125 ··· connector header, 127 ··· module board, 129 ··· bellows type contact, 139 ··· sealing material

Claims (13)

[Claims] A disk drive mechanism for supporting and driving a magnetic disk; a head moving mechanism mounted with a magnetic head for recording and reading signals to and from the magnetic disk, and moving the head in a radial direction of the disk; A magnetic disk drive, comprising: a hermetically sealed housing that hermetically accommodates the disk drive mechanism and the head moving mechanism in an atmosphere from which moisture is removed at substantially atmospheric pressure. 2. The magnetic disk drive according to claim 1, wherein the inside of the closed casing is an atmosphere of a dry inert gas. 3. The magnetic disk drive according to claim 1, wherein the atmosphere of the closed casing is an atmosphere of dry nitrogen gas. 4. The magnetic disk drive according to claim 1, wherein the sealed housing has a housing space for supporting and housing the disk drive mechanism and the head moving mechanism, and the housing space of the chassis. And a seal member for sealing a contact portion between the chassis and the cover. 5. The magnetic disk drive according to claim 2, wherein the disk drive mechanism includes a spindle motor, a stator of the spindle motor is supported by the chassis, and a gap between the chassis and the stator is formed by a sealing material. A magnetic disk drive characterized by being sealed. 6. The magnetic disk drive according to claim 1, wherein the connector for making an electrical connection between the inside and the outside of the closed casing is a connector having a bellows-type contact structure. . 7. The magnetic disk drive according to claim 4, wherein a gap between a contact portion between an upper end surface of a bearing portion of the head moving mechanism and a lower end surface of the cover is sealed with a sealing material. Magnetic disk drive. 8. A cartridge holder on which at least a main circuit board is mounted and which can be mounted on a main body of a host device; A disk drive mechanism for supporting and driving a magnetic disk; and a magnetic head for recording and reading signals to and from the magnetic disk and moving the head in a radial direction of the disk. A magnetic disk device comprising: a moving mechanism; and a sealed housing that hermetically accommodates the disk driving mechanism and the head moving mechanism in an atmosphere from which moisture is eliminated at substantially atmospheric pressure. 9. The magnetic disk drive according to claim 8, wherein the inside of the closed casing is an atmosphere of a dry inert gas. 10. The magnetic disk drive according to claim 8, wherein the atmosphere in the closed casing is an atmosphere of dry nitrogen gas. 11. A disk cartridge which mounts at least a main circuit board, is detachable from a cartridge holder mountable on a main body of a host device, and operates while being electrically connected to the circuit board. A disk drive mechanism that supports and drives the disk; a head movement mechanism that mounts a magnetic head that records and reads signals on and from the magnetic disk and moves the head in the radial direction of the disk; the disk drive mechanism and the head A disk cartridge, comprising: a sealed housing that hermetically accommodates a moving mechanism in an atmosphere from which moisture is removed at substantially atmospheric pressure. 12. The magnetic disk drive according to claim 11, wherein the inside of the closed casing is an atmosphere of a dry inert gas. 13. The disk cartridge according to claim 11, wherein an atmosphere of the closed casing is an atmosphere of dry nitrogen gas.