JP2003030974A - Disk device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To impart a disk device which is utilizable as an external memory of a computer system have low cost and sufficient storage capacity, compactness characteristic which is advantageous for an IC memory card, light weight, low power consumption, and mechanical impact resistance. SOLUTION: This device is provided with one sheet of disk for storing information and having a diameter of 1.89 inch or less, a disk drive section rotating the disk, a head mechanism section performing write and read of information for the disk, and an electronic circuit comprising at least an interface circuit, inside of housing, a connector connected to the electronic circuit is provided at the out side of the housing, and the device is constituted, so that outside dimensions of a plane comprising the housing and the connector is approximately 85.6 mm×54 mm, thickness dimension is 8 mm or less.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk device such as a magnetic disk or a magneto-optical disk that can be used as an external memory of a computer system. More specifically, the present invention relates to the structure of the entire disk device including a credit card size housing, a circuit portion, and various mechanical component configurations in the housing.

[0002]

2. Description of the Related Art Generally, a disk device such as a magnetic disk device having at least one magnetic disk used as a storage medium is one of promising non-volatile memories in various fields including a computer system. It is put to practical use. More recently,
Technical improvements such as an increase in the storage density of the magnetic disk in the magnetic device have been remarkably made, and as a result, the magnetic disk device itself has been downsized. On the other hand, due to the rapid development of microelectronics in recent years, computer systems and the like have been made compact, lightweight and low in power consumption as represented by portable personal computers.

As described above, although the technology for downsizing of the magnetic disk device has made remarkable progress in recent years, when a magnetic disk having a diameter of 2.5 inches is used, the magnetic disk device is used. Is too big, too heavy, and even too much power consumption.
For this reason, it is difficult to apply the above-mentioned current magnetic disk device to the portable personal computer, which is required to be compact, lightweight, and low in power consumption. In order to meet this demand, a magnetic disk device using a magnetic disk having a diameter of 1.89 inches has recently been proposed. Certainly, this magnetic disk device is smaller than a magnetic disk device having a diameter of 2.5 inches. However, in such a magnetic disk device composed of a magnetic disk having a diameter of 1.89 inches, the conventional technology is diverted and miniaturized without any improvement. This causes a problem. That is, the size, especially the thickness, of the above magnetic disk device is still too large to be practically used by a portable device (recently, it is said that the minimum thickness is about 10 mm). ). In addition, another problem arises. In other words, such a magnetic disk device is resistant to mechanical shock caused by external factors such as dropping the portable device even when the above-mentioned disk device is applied to the portable device. That is, it cannot withstand enough.

Further, US Pat. No. 4,639,863 and
No. 4,860,194 discloses a modular unit disk file subsystem, in which the print is extended directly to the side of the housing containing the head and disk mechanism to make it thinner. The circuit board is attached. However, in the related art, it is not disclosed what the specific thickness is by such a structure. Furthermore, even if the thickness of the disk device is sufficiently reduced, a new problem arises. That is, the area occupied by the disk device including the printed circuit board and the housing becomes larger than usual.

In consideration of such a situation, in a known portable personal computer or the like currently used, an integrated circuit (IC) memory card is tentatively used rather than a magnetic disk, which is required. The size and weight are ensured. Recently, the specifications of this IC memory card have been standardized {JEIDA (Japan Electron
ic Industry Development Association) standard specifications and PCMCIA (Personal Computer Memory Card Inte
According to this specification, the thickness of the card is specified to be 5 mm or 3.3 mm. Since a card that satisfies the standard specifications is sufficiently small and light enough, the above card is suitable for a personal computer in terms of size and weight.

[0006]

However, at present, there are two serious disadvantages as described below.

First, the computer system using the IC memory card becomes extremely expensive. Specifically, the cost per megabyte is tens of thousands of yen /
MByte, which is hundreds of times higher than a computer system that uses a flexible disk drive, and tens of times higher than a hard disk drive (that is, a magnetic disk drive). Secondly, the storage capacity of the entire computer system using the IC memory card is not always sufficient to meet the general demands of users. Currently, IC memory cards having a storage capacity of about 1 MByte are mainly used. Moreover, this IC memory card storage capacity will increase in the future from several MByte to the order of 10 MByte. On the other hand, at present, an ideal portable personal computer is actually required to have a memory system of 40 MBytes or more. Therefore, the computer system using the above IC memory card does not substantially satisfy the storage capacity requirement. Moreover, it is expected that the storage capacity demanded by users will increase even further in the near future. Therefore, even considering the further development of IC memory technology, I
It is difficult to keep up with the required storage capacity of the C memory card.

As described above, when the conventional magnetic disk device is used in a portable personal computer, it will be sufficient in terms of cost and storage capacity. However, it is not sufficient in terms of size, weight, power consumption and mechanical shock resistance. On the contrary, the IC memory card used for the portable personal computer is sufficient in terms of size, weight, power consumption and mechanical shock resistance. However, the cost of IC memory cards is too high and their storage capacity is not always satisfactory to the user. Therefore, in order to realize a true portable personal computer, it is strongly desired that the memory device has both the advantages of the magnetic disk device and the advantages of the IC memory card.

One solution is to use PCMCIA
The Type-III standard is included. This is Type-I, Type
-It has the same plane dimensions as II and allows a thickness of up to 10.5 mm. By providing this with a connector of PCMCIA (JEIDA) standard, Type-I, Type-II
It is possible to accommodate this 10.5mm card in two vertically aligned slots.

As described above, if it is 10.5 mm, it is possible to realize a magnetic disk device by utilizing the conventional technology. Therefore, such a product is currently announced. However, thinning is essential also in a notebook computer, and arranging two slots vertically is an obstacle to thinning. Also, in a palmtop computer, only one slot can be prepared. That is, the IC memory card cannot be used in all devices. Therefore, it is strongly desired to realize a magnetic disk device having the same external dimensions as Type-I and Type-II, that is, having a thickness of 5 mm or less.

It is therefore an object of the present invention to have the advantages of an IC memory card, such as compactness, lighter weight, lower power consumption, and lower cost, while having sufficient storage capacity. It is an object of the present invention to provide a magnetic disk device having various advantages such as high mechanical shock resistance.

Still another object of the present invention is that the thickness is the same as that of an IC memory card, for example, 5 mm, the weight is less than 70 g, the stability against mechanical shock exceeds 200 G, and the external magnetic field of 1 KGauss or more. Is to provide a magnetic disk device that is stable.

[0013]

In order to achieve the above object, a disk drive according to the present invention comprises a housing for accommodating at least one disk for storing information, disk drive means for rotating the disk, It is composed of a head mechanism section for writing and reading information to and from the disk, and an electronic circuit. At least one connector connected to the electronic circuit is fixed to the outside of the housing.

The electronic circuit further includes an interface circuit that enables communication with an external host system, a write / read circuit that receives a read signal from the head mechanism unit and supplies a write signal to the head mechanism unit, and a disk drive. Circuit for controlling the operation of the head section and the head mechanism section, and a control circuit for receiving a control signal from the host system via the interface circuit and supplying the control signal to the write / read circuit and the servo circuit including.

Further, the head mechanism section includes a magnetic head for executing recording / reproduction corresponding to reading / writing of information at a predetermined position on the disk, a support spring mechanism for supporting the head, and the support spring mechanism. An arm that supports
A rotary actuator for rotating the arm to move the head to a predetermined position on the disk.

[0016] Preferably, the housing comprises a lower base and an upper cover, and the printed circuit boards are vertically arranged along one inner wall surface or both inner wall surfaces of the base and the cover. More specifically, the printed circuit board is a flexible printed circuit board. Alternatively, the base and the cover are both metal base printed boards which are made of metal and also serve as the printed circuit board.

More preferably, the disk device of the present invention has a planar outer dimension of about 85.6 mm × 54 mm, an outer thickness of 8 mm or less, and typically, an outer thickness of 5 mm.
Is.

More preferably, an insertion guide portion for inserting the housing into a slot of an external device to bring the disk device into an operating state is thinner than the entire thickness of the housing on both sides in the longitudinal direction. Is configured as follows.

More preferably, the connector is arranged on the short side of the housing, the connector is arranged on one of the short sides of the housing, and the connector is a single connector.

More preferably, the base and the cover each have a coupling flange on an outer peripheral portion of the base and the cover, and the coupling flange is joined to each other to form the housing. In this case, the base and the cover are manufactured by molding an iron-based metal, a metal containing aluminum, or a resin member.

Furthermore, the joined coupling flange is preferably covered by at least one frame, which frame forms an insertion guide for inserting the housing into a slot of an external device, and The frame forms a cushioning member for keeping the inside of the housing airtight.

More preferably, the disk drive unit includes a spindle motor arranged inside the disk for rotating the disk. Further, the spindle motor includes a first fixed shaft fixed to a predetermined position of the housing for rotatably supporting the disc, and upper and lower sides of the first fixed shaft for supporting the disc. And a pair of first bearing means attached to the.

Furthermore, the head mechanism section includes a rotary actuator for moving the head to a predetermined position on the disk, and a second fixed shaft fixed to a predetermined position in the housing. A pair of second bearing means attached to the upper side and the lower side of the second fixed shaft for supporting the disk, the second fixed shaft being fitted and fixed in the base. It

More preferably, the first fixed shaft and the second fixed shaft are secured to a part of the first and second fixed shafts, and the first and second fixed shafts are secured to the base. Each has a flange portion for fixing, and the flange portion is substantially equal to or equal to an average bearing span between a pair of bearing means fixed to each of the first fixed shaft and the second fixed shaft. It has the above diameter.

More preferably, the fixed shaft on the disk side and the fixed shaft on the actuator side are rigidly connected to the cover in the thickness direction of the housing. More specifically, one ends of the fixed shaft on the disk side and the fixed shaft on the actuator side are fixed to the cover by spot welding or an adhesive.

More preferably, the spindle motor has a fixed shaft for fixing the spindle motor itself at a predetermined position in the housing, a pair of bearing means fixed around the fixed shaft, and an outer peripheral portion connected with the central opening of the magnetic disk. And a rotor magnet fixed to the spindle hub and having at least one stator coil fixed to the base. In this case, the rotor magnet is placed between the position of the inner diameter of the magnetic disk and the position of the outer peripheral portion of the bearing means in the radial direction of the rotor magnet.

More specifically, the spindle motor is an outer ring rotary type motor, and the rotor magnet has a thickness larger than the average spacing between the pair of bearing means on the upper side and the lower side, and a magnetic disk, The centers of the rotor magnet and the pair of bearing means are placed at substantially the same position in the thickness direction of the housing.

Alternatively, the spindle motor is a flat-type motor having an axial gap in which a magnetic gap is formed in the axial direction of the spindle, and the magnetic disk engages the outer periphery of the rotor magnet and the inner side of the rotor magnet. The peripheral edge is rotatably supported on the spindle via bearing means, and the rotor magnet is arranged to function as a spindle hub.

In both of the above two types of spindle motors, the magnetic disk is preferably fixed to the spindle hub by gluing.

More preferably, a load / unload assembly is provided in the housing, and the magnetic head is associated with insertion / removal operations for inserting the housing into and out of the slot of the host device. Is loaded at a predetermined position on the magnetic disk,
Then, the magnetic head is to be unloaded from that position. In addition, a locking assembly is provided within the housing to allow the magnetic disk and actuator to be mechanically locked in place in connection with the above insertion / removal operations.

More preferably, the actuator is a flat coil located at one end of an actuator moving part (carriage) opposite to the magnetic head with respect to the fixed axis of the actuator, an upper yoke placed around the flat coil, and a lower part. Includes permanent magnets located in the yoke and / or side yokes and / or in the upper and / or lower yokes. In this case, the magnetic circuit is
It is composed of a lower yoke, a side yoke, and a permanent magnet. Further, one or both of the upper yoke and the lower yoke is configured such that the width of the central portion of each of the upper yoke and the lower yoke is larger than the width of each of the remaining portions.

More preferably, the actuator comprises an upper yoke element having a plurality of first bent portions (first folds) each bent downward at substantially right angles, and a plurality of upper yoke elements extending at substantially right angles. Second bent
Is a moving coil type actuator including a lower yoke element having a bent portion (second bent portion). Further, a closed magnetic circuit is formed by combining the upper yoke element and the lower yoke element with each other.

More preferably, in the disk drive according to the present invention, a retract magnet (retracting magnet) provided on the outer edge portion of the actuator for retracting (retracting) the magnetic head, and the periphery of the retract magnet. And a retract yoke having a gap in which the retract magnet is placed.

More specifically, the thickness of the gap changes in the moving direction of the magnetic head for retracting the magnetic head toward a predetermined position. Typically,
The thickness g of the gap changes with about 1 / (x + x ₀ ) in relation to the movement value x of the magnetic head.

Alternatively, in the plane including the space between them, the area of the portion where the retract magnet and the retract yoke overlap each other is determined by the direction of movement of the magnetic head for retracting the magnetic head toward a predetermined position. Can be changed.

Additionally preferably, the disk drive according to the present invention has one magnetic disk equal to or less than 4.8 cm (1.89 inches) and two magnetic heads for performing read / write operations. A rectangular housing including a head assembly (head mechanism portion) and further including one connector connected to an electronic circuit outside the housing, and having a surface area of approximately 85.6 mm × 54 mm is provided. In such a configuration, the magnetic disk and the two magnetic heads are configured so that perpendicular magnetic recording can be performed. Typically, each of the two magnetic heads is a unit magnetic head (integrated magnetic head) having a flexible thin sheet-shaped body (flexible thin plate-shaped main body). Alternatively, the magnetic disk and the two magnetic heads are configured to perform longitudinal magnetic recording (horizontal magnetic recording), and each of the two magnetic heads includes a head slider having a predetermined flying height.

[0037]

The above objects and features of the invention will become more apparent from the following description of preferred embodiments with reference to the accompanying drawings.

Before explaining the embodiment of the present invention,
Related techniques and their drawbacks are described below with reference to the related drawings.

1 and 2 are views showing an example of the structure of a conventional disk device. More specifically, FIG. 1 is a front view showing the overall structure of a disk device according to the prior art, and FIG. 2 is a conceptual diagram showing the circuit and mechanical components of FIG. 1 separately. Is.

In this case, the magnetic disk device 1 has a double-structured housing, that is, an inner housing 6 and an outer housing 7. As shown in FIGS. 1 and 2, a magnetic disk 2, a spindle molding 3, a magnetic head mechanism 4, and a head IC 5a constituting an amplifier circuit 5.
Etc. are contained in the inner housing 6, which is enclosed by an outer housing 7. Further, in the space between the outer housing 7 and the inner housing 6, the IC 8 constituting the read / write circuit 8a,
An IC 9 forming the control circuit 8b, an IC 10 forming the positioning circuit 8c, and an IC 10 'forming the interface circuit 8d are incorporated. Furthermore, the connector 7 ′ is attached to the outer housing 7.

Such a magnetic disk device 1 is usually housed in a fixed place, but if necessary, it may be carried and an external host system, such as a computer (not shown), may be provided with a connector 7 '. Are combined using. Further, the information is read (reproduced) from the magnetic disk 2 and the information is written (recorded) on the same magnetic disk 2 by using the read / write circuit 8a.

More specifically, regarding the circuit configuration, the control signal S _c and the address signal S _a are transmitted from the host computer to the interface circuit 8d via the connector 7 '. Then, the control signal S _c is input to the control circuit 8b, and the status signal S _s indicating the current state of the magnetic disk device 1 is sent from the control circuit 8b to the interface circuit 8d. Further, the interface circuit 8d is coupled to a positioning circuit 8c that determines the position of the magnetic head mechanism 4 on the magnetic disk 2 according to a command from the host computer. Here, information of the position read by the magnetic head mechanism 4 through the amplifier circuit 5, the position signal S _p
Is returned to the positioning circuit 8c, where accurate positioning is performed by the servo control means. In addition, power supply power is being supplied to all other circuits as well as to all other circuits.

In the above-mentioned prior art, the inner and outer housings 6 and 7 have a double structure in which the disk device 1 mainly includes the inner housing 6 including mechanical parts and the inner housing 6. It has an outer housing 7 which encloses and mainly contains the electronic circuitry. Due to such a double structure, the thickness H ₁ of the outer housing 7 (FIG. 1), that is, the lower limit of the height dimension of the disk device 1 is limited to a certain value. Therefore, according to the prior art as shown in FIGS. 1 and 2, a disk device having a thickness similar to that of the IC memory card and having a size matching the size of the IC memory card is realized. It has become difficult to do so. Therefore, there is a strong need for a disk device whose external dimensions, in particular its thickness, can be significantly reduced by obtaining a single-piece housing.

FIGS. 3, 4, 5, 6, 7, 8 and 9 show
It is a diagram showing a preferred embodiment of a disk device according to the present invention. More specifically, FIG. 3 is a perspective view showing the outer shape and dimensions of the magnetic disk device; FIG. 4 is a perspective view partially showing the structure inside the housing; and FIG. 5 is a view in FIG. FIG. 6 is a conceptual diagram showing the circuit portion and the mechanical portion separately; FIG. 6 is an exploded perspective view showing the structure of FIG. 4 in more detail; FIG. 7 is a front sectional view of FIG. FIG. 8 is an enlarged sectional view taken along the line II of FIG. 4;
It is an expanded sectional view which follows the II-II of a figure.

In the first preferred embodiment, as shown in these figures, the magnetic disk drive 20 comprises a single rectangular housing consisting of a lower base 22 and an upper cover 23. Have And housing 21
Has a plane dimension of about 85.6 mm × 54 mm; has a thickness of 8 mm or less, typically 5 mm or 3.3 mm; that is, the above-mentioned magnetic disk device 20 is a PCMCIA standard. It can have the same size as a Type II IC memory card.

In this case, unlike the prior art as in FIGS. 1 and 2, one magnetic disk 24, which stores information and preferably has a diameter of 48 mm or 1.89 inches, is rotated. The disk drive means 15, the head assembly (head mechanism section) for executing the read / write operation with respect to the magnetic disk 24, and the electronic circuit including the electronic parts (70) are the closed space in the single housing 21. It is housed in.

Further, the disk drive means 15 includes a spindle motor 26 located at a central portion of the magnetic disk 24 so that the magnetic disk 24 can rotate, and a housing for rotatably supporting the magnetic disk 24. 21 and a spindle 25 fixed at a predetermined position.

Furthermore, the head assembly includes at least one magnetic head 27 that executes a reproducing / recording operation in response to a reading / writing operation of information on either the upper surface or the lower surface of the magnetic disk 24. , Magnetic head 27
And an actuator 29 for rotating the arm 28 in any direction to move the magnetic head 27 to a predetermined track on the magnetic disk 24.

Further, as a preferred embodiment, a head having a small pressing load is used as the above magnetic head.
When a contact type head as disclosed in JP-A-3-178017 is used as the head, a light load of several tens of mg can be obtained. Even in the flying type head as shown in the figure, a light load head of several 100 mg can be used. Furthermore, by applying a negative pressure type slider and a load / unload mechanism, head friction at the time of spindle startup. Can be almost ignored. With such an advantage, a spindle motor that can be started with a low power supply voltage is realized.

Furthermore, the electronic circuit described above is an interface circuit 39 that enables communication with an external host computer.
And receives the read signal from the head assembly,
Further, a read / write circuit 36 for supplying a write signal to the head assembly, a positioning circuit 37, a servo circuit having an amplifier circuit (head IC) 35 for controlling the operation of the magnetic disk 24 and the head assembly, and an external host computer. It has a control circuit 38 for receiving a control signal S _c from an interface circuit 39 and supplying the control signal S _c to a read / write circuit 36 and a servo circuit. More specifically, the control signal S _c and the address signal S _a are transmitted from the host computer to the interface circuit 39 via the connector 42. Then, the control signal S _c
Is input to the control circuit 38, and the magnetic disk device 20
A status signal S _s indicating the current state of S is sent from the control circuit 38 to the interface circuit 39. Further, the interface circuit 39 is coupled to the positioning circuit 37, where the position of the magnetic head 27 on the magnetic disk 24 is determined in accordance with a command from the host computer. Here, the information at the above-mentioned position read by the magnetic head 24 passes through the amplifier circuit 35 and becomes a position signal S _p as a positioning circuit 37.
, Where accurate positioning is performed by the servo control means. In addition, power supply power is provided to all of the above circuits, along with all other circuits, via connector 42.

Here, the interface signals referred to in the present invention will be supplementarily mentioned. The interface specifications performed via the connector 42 include the following. SCSI (Small Computer System Interface), I
DE (or PC / AT), and PCMCIA-ATA (AT Attachment), which will be standardized in the near future. Of these, SCSI and IDE have different electrical specifications from the PCMCIA-compliant IC memory card, and therefore cannot be shared with the IC memory card. On the other hand, PCMCIA-ATA is a PCMCIA PC Card S
Since it is an extension function of tandard, it can share the slot with the IC memory card. Thus, in the preferred embodiment, the interface is said to be PCMCIA-ATA.

Further, the voltage of the power source is preferably 3 to 3.3V. In a general electronic circuit, power consumption can be reduced by operating at a low voltage.
ICs and the like that operate at low voltage have been obtained by recent advances in circuit technology, but on the other hand, lowering the voltage for the mechanical section does not lead to a reduction in power consumption.
Rather, the consumption ratio in the electronic circuit to drive becomes high, and the power consumption tends to increase. The measures for the low voltage of the mechanical section are as follows, focusing on the main items. First of all, the improvement of the spindle motor has made it possible to start at a low voltage, secondly, the load torque has been reduced due to the smaller diameter of the bearing, and thirdly, the start of the light load head. The load torque could be reduced, and fourthly, the noise resistance was improved by using the iron housing.

Further, as shown in FIG. 6, a plurality of insertion guide portions 50 are arranged on respective predetermined portions of the longer side surface of the housing 21. The above-mentioned insertion guide portion 50 is designed so that the housing 21 can be inserted into the slot of the host computer, and the disk device is put into the operating state when the mutual connectors are connected by the insertion there. . Here, the thickness of these insertion guide portions 50 is formed to be smaller than the thickness of the housing 21.

As is apparent from FIG. 7, the disk 24 is arranged at the approximate center position in the thickness direction of the housing 21. Thus, there is a planar space 30 between the disc 24 and the base 22, while the disc 24 and the cover 23
There is another planar space 31 between and.

An IC 35a is incorporated in the space 30 near the arm 28 and constitutes an initial stage amplifier circuit 35 for amplifying an extremely weak read signal reproduced by the magnetic head 27. Further, in space 30, all I's of other analog groups that process analog signals are
C, for example, an IC 36a forming a part of the read / write circuit 36 and an IC 37a forming a part of the positioning circuit 37
Is also incorporated.

On the other hand, in the space 31 located on the opposite side of the space 30 with respect to the disk 24 and separated from the space 30 by the disk 24, all the digital groups for processing digital signals are processed. IC, that is, IC 36 that constitutes the rest of the read / write circuit 36
b, an IC 37b that constitutes the rest of the positioning circuit 37,
The IC 38a and the interface circuit 39 that constitute the control circuit 38
IC39a which constitutes the above is incorporated.

The electronic component 70 including all of the above ICs 36a to 39a is the printed circuit board 14 (PCB: printed circuit board).
Are assembled on the respective surfaces of the first body portion 40a and the second body portion 40b, and these portions are mounted adjacent to the inner wall surfaces of the base 22 and the cover 23, respectively, and Electronic component (70) is printed circuit board 14
Together, it is contained within the housing 21. Preferably, the above-mentioned printed circuit board (PCB) 14 is a flexible printed circuit board (FPC: flexible printed circuit board), which is bent on one long side of the housing 21 to form the lower first circuit board. The main body portion 40a and the upper second main body portion 40b are formed. In this case, the flexible printed circuit board 40 described above has the lower first body portion 40.
a and the upper second main body portion 40b are connected to each other 2
It has bands 40c and 40d of one connecting portion (relay portion). Here, the reason why the upper and lower FPC bent portions (relay portions) are selected on the long side of the housing 21 will be described. The wiring patterns of the upper and lower FPCs are connected on the FPC as shown in FIGS. 4 and 6. The flow of signals is as follows: head → head IC → demodulation circuit (analog) of read / write circuit → digital processing circuit → connector. Therefore, as described above, the analog part and digital part should be separated vertically. Considering this, the signal and the control signal output from the demodulation circuit pass through the relay section. As the connection position, the short side and the long side of the rectangular housing can be considered. As described above, the connector is attached to one short side and the head actuator is installed on the opposite side. Therefore, when connecting the FPC on the short side, the head actuator must be connected. This is a disadvantage from the signal flow described above.
By setting the long side, the above-described signal flow can be realized without difficulty. However, when a 48 mm disk is incorporated in a memory card-sized housing, the disk hangs on the long side, so it was possible by hollowing out the FPC in this part. When the FPC is bent, it is advantageous to divide the connecting portion in order to reduce its elastic force.

As shown in FIG. 8, the connecting portion 40c
(40d) is positioned over the base 22 and the cover 23. In addition, the housing 21 is closed and the cover 23
When the base 22 covers the base 22, the connecting portion 40c (40d) is curved so as to project into the housing as shown in FIG. By providing an extra length in such a connection portion, it becomes possible to assemble the base covers in a plane. The longer this extra length, the more room for assembly, but on the other hand, the overhanging portion interferes with the disc and other mounted components. To avoid this, it is proposed to further fold this overhang and fold it in multiple steps. The folding is realized by holding the center of the bridge of the FPC with a wire or the like with the base and the cover arranged side by side. In the closed state of the base 22 and the cover, the cover 23 is intimately adhered to the base 22, for example via the packing 41, so that the entire space in the housing containing the discs etc. is tightly closed. An air filter for breathing is generally attached to the housing in order to reduce the pressure difference between the inside and the outside due to the temperature rise during operation. In this sense, it cannot be said that the structure is completely sealed, but since the dust is shielded from the outside air, a structure having a breathing filter is also usually called a sealed structure.

Further, the connector 42 is mounted on one side of the two short sides of the housing. Here, the connector 42 is positioned so as to face the actuator 29 across the disk 24, and is positioned at a substantially central position with respect to the thickness direction of the housing 21, so that mechanical support of the entire disk device is achieved. This can be realized with a good weight balance by the connector 42.

Further, the magnetic disk drive of the present invention does not have a built-in anti-vibration support mechanism, as seen in general devices,
The feature is that the connector provides mechanical support.

The holding force of the connector is quite high because of the high pin count of 68 pins, but it is still necessary to consider disturbance. As the disturbance, the force generated internally,
1. Unbalanced vibration of spindle 2. There is a seek reaction force from the actuator, which is subject to external vibration and shock.
Here, first, countermeasures are taken for two internally generated items.

First, the unbalanced vibration of the spindle is always generated during rotation, which causes a position error. For this reason, in addition to consideration such as minimizing the amount of residual unbalance, measures will be taken to reduce the effect even under the supporting conditions. Generally speaking, the unbalanced vibration is determined by the moment due to the distance between the center of rotation of the spindle and the center of gravity or the supporting point. Therefore, in the present invention, in order to support the connector, the spindle is arranged on the side close to the connector and the actuator is arranged on the side distant from the connector. The generated moment can be reduced by about 40% as compared with the reverse configuration, and thus the position error due to unbalanced vibration can be reduced by 40%. When the actuator is perfectly balanced, only the rotational moment is generated.It does not change at any position, so the adverse effect of locating the actuator far from the connector is theoretically Absent.

As a countermeasure against the reaction force of the actuator, first, since it is supported linearly by the connector, it becomes considerably rigid in the rotation direction, and the rotational movement of the entire drive due to the moment generated by the actuator is suppressed, and the position error due to the drive rotation is suppressed. Hold down. The connector is arranged at the center of the drive thickness direction, and the center of gravity of the actuator is also aligned with this position, so that the seek reaction force (moment) does not cause vertical or torsional movement. This suppresses position error, levitation fluctuation, etc. due to the out-of-plane direction movement.

More precisely, the connector 42 is
The second body portion 40b of the FPC 40 fixed to the cover 23 of the
On the second body portion of the digital group of electronic components, for example IC39 of the interface circuit 39.
a is assembled. Further, a part of the second main body portion 40b which is connected to the connector 42 is covered with the packing 41.

A structure similar to the disk device described above is disclosed in Japanese Patent Laid-Open No. 60-242568. However, in such a known arrangement, all of the electronic components, including analog and digital groups, are incorporated in a single housing, unlike in the first preferred embodiment described above. Is not clearly stated.

On the contrary, the disk device having the structure according to the present invention as shown in the first preferred embodiment makes effective use of the space in the single housing, so that the electronic parts, the disk, and It is intended to house all of the various mechanical parts. As a result, the disk device 20 can have a single housing configuration and can have the same thickness of about 5 mm as the PCMCIA Type II IC memory card described above. Accordingly, disk device 20 is thinner and more compact than conventional disk devices and can be more easily used for portable computing devices than conventional disk devices.

Further, the connecting portions 40c and 40d are the above-mentioned FPC.
Since it is preformed in 40, the two body parts 40a, 40
It becomes unnecessary to provide connector elements for connecting to each other between b. Due to the above advantages, the disk device 20
Can have the thinner dimensions desired in a true portable file storage.

As described above, the structure of the disk device in the first preferred embodiment also has the following technical features.

First, the analog signal for analog circuit processing and the digital signal for other digital circuit processing are:
Separated from each other on the lower side of the upper side of the housing.

Secondly, the disc substrate, which is generally made of metal including aluminum, is located between the two separate circuit parts, ie the disc substrate. Has a function that the two circuit parts can be electromagnetically shielded from each other.

With such a structure, it becomes possible to prevent the analog signals in the analog circuit section from being mutually influenced by the electromagnetic waves generated by the digital circuit section. In other words, the disk drive in the first preferred embodiment has a configuration in which various electrical noise countermeasures can be adopted without increasing the thickness dimension of the disk drive. In that case, the thickness of the disk device is reduced to 3.3 mm and the PCMCIA
The same as in the case of Type I IC memory card,
It will be possible in the future.

Further, by adopting a structure that is resistant to electrical noise, it is possible to realize a disk device that operates with a low power supply voltage, and it is possible to suppress the power consumption of the device.

FIG. 10 is a diagram showing a second preferred embodiment of the disk device according to the present invention. More specifically, the tenth
FIG. 1 is a sectional front view showing a main part of a disk device related to a second preferred embodiment of the present invention. In the following, the same parts as above are designated using the same reference numbers.

In the second preferred embodiment shown in FIG. 10, the flexible printed circuit board (flexible printed circuit board) 40 in the first preferred embodiment is replaced by a metal-based printed circuit. Boards (printed circuit boards) 91 and 92 are used. As shown in FIG. 10, both base 22 and cover 23 are made of a metal including iron, and base 22 and cover 23
Metal-based printed circuit boards 91, 92 are directly formed on the respective inner wall surfaces of the. Furthermore, IC35
a-39b (only IC 38a is shown in FIG. 10) are assembled directly onto the metal-based printed circuit boards 91, 92.

According to the second preferred embodiment, the printed circuit board need not be adhered to the inner wall surfaces of base 22 and cover 23. Therefore, in the second preferred embodiment described above, the series of steps for mounting the electronic component is simpler than the series of steps for mounting in the first preferred embodiment.

FIG. 11 is a diagram showing a third preferred embodiment of the disk device according to the present invention. More specifically, FIG. 11 (A) is a simplified top view and FIG. 11 (B) is a simplified front view showing the features of the third preferred embodiment.

As shown in FIGS. 11 (A) and 11 (B), the supplementary shielding sheet 61 has the above-mentioned supplementary shielding sheet 61 in which the surrounding area inside the base 22 and the cover 23 on the outside of the disk 24. It is provided in a form that is covered with 61. In such a configuration, the lower analog circuit section and the other upper disk circuit section in the housing 21 as shown in FIG. 7 can be electromagnetically separated from each other. 11th
A third preferred embodiment as shown is housing 21
It can be effectively applied when the entire area in which the analog and digital circuitry is located cannot be completely covered by the disk 24 alone.

FIG. 12 is a diagram showing a fourth preferred embodiment of the disk device according to the present invention. More specifically, the 12th
Figure (A) is a simplified top view and Figure 12 (B) is a simplified front view showing the features of the fourth preferred embodiment.

As shown in FIGS. 12 (A) and 12 (B), the first and second shielding walls 71 and 72 each have a rib type and are formed inside the base 22 and the cover 23. It
The first shield wall 71 on the side of the base is IC36a and IC37.
It is located between a. Such first shielding wall 71
Is useful for preventing the reproducing / recording circuit block (reading / writing circuit block) and the positioning circuit block of the analog circuit section from interfering with each other. Further, the second shielding wall 72 on the side of the cover 23 has the IC 36b and the IC 37
It is located between b. Such a second shielding wall
72 serves to prevent the reproducing / recording circuit block and the positioning circuit block of the digital circuit section from interfering with each other, as in the case of the first shield wall 71. In other words, the first and second shielding walls 71 and 72 are configured such that the analog circuit section and the digital circuit section are separated in the individual functional blocks. In such a configuration, it can be ensured that the electromagnetic shielding is more completely realized than the shielding in the third preferred embodiment shown in FIG.

FIG. 13 is a diagram showing a fifth preferred embodiment of the configuration of the disk device according to the present invention. More specifically, FIG. 13 (A) is a simplified top view, FIG. 13 (B).
FIG. 4 is a simplified front view showing the features of the fifth preferred embodiment.

As shown in FIGS. 13 (A) and 13 (B), the first shielding wall portion 81 and the second shielding wall portion 82 each have a rib type, and are formed inside the base 22 and the cover 23. Projecting toward the disk 24 at. More specifically, the first and second shield wall portions 81 and 82 are formed along the boundary between the regions, and the magnetic head 27 interlocks in the region. In such a configuration, the magnetic disk 27 and the IC 35a forming the first-stage amplifier circuit are likely to be affected by various electrical noises, but are protected from electromagnetic waves generated by other circuit parts. be able to.

FIG. 14 is a diagram showing a sixth preferred embodiment of the disk device according to the present invention. More specifically, the 14th
The figure is a cross-sectional front view showing the main part of a disk drive according to a sixth preferred embodiment of the present invention.

In FIG. 14, a flexible printed circuit board (flexible printed circuit board) 90 is preferably used as the printed circuit board (printed circuit board) 16 (FIG. 6). Such a flexible printed circuit board 90 has a dual structure,
In the double structure, the circuit patterns 90b-1, 90b
-2 is formed on one surface of the film substrate 90a, and the entire ground patterns 90c-1 and 90c-2 are formed on the other surface of the film substrate 90a except for the bent portions. Further, the flexible printed circuit board 90 is provided along the inner wall of the housing 21. In that case, the circuit pattern 90b
-1, 90b-2 face the inner wall surfaces of the base 22 and the cover 23, and the entire ground patterns 90c-1, 90c-2.
Faces the lower and upper surfaces of disk 24.

Further, in FIG. 14, ICs 36a, 37a
Are collected on the circuit pattern 90b-1 of the flexible printed circuit board 90, and are closely attached to the inner wall of the base 22. On the other hand, the ICs 36b, 37b, 38a, and 39a are assembled on the circuit pattern 90b-2 of the flexible printed circuit board 90 and tightly adhered to the inner wall of the cover 23. Heat dissipation fins 22Ba and 23Ba are formed on the surfaces of the base 22 and the cover 23. Due to the heat dissipation fins 22Ba and 23Ba, the IC
The heat generated by 36a-39a can be effectively dissipated through the base 22 and cover 23 to the outside of the housing 21.

Here, the electromagnetic wave is generated from the circuit pattern 90b-2 that processes a digital signal and is directed to another circuit pattern 90b-1 that processes an analog signal. In the configuration of the sixth preferred embodiment, the circuit pattern 90b-1 is the entire ground pattern 90c-1,
The 90c-2 and the disk 24 can effectively shield from electromagnetic waves.

Further, a part 90A of the flexible printed circuit board 90 arranged near the magnetic head 27 is an IC.
The part in which 35a is mounted is shown. Regarding the part 90A, the circuit pattern 90b-1 is formed on the surface opposite to the surface of the other part of the circuit pattern 90b-1 by using the through hole 90d. Therefore, the IC 35a can be provided near the magnetic head 27. In such a configuration, the electrical path from the magnetic head 27 through the IC 35a is further shortened, so that the reproduction signal (readout signal) is less likely to be affected by disturbance such as electrical noise.

FIGS. 15, 16, 17, 18, and 19 show
It is a figure which shows the 7th suitable Example of the disc apparatus by this invention. More specifically, FIG. 15 is a perspective view showing the inside of the magnetic disk device as seen through, FIG. 16 is an exploded perspective view showing the configuration of FIG. 15 in more detail, and FIG. 17 is a perspective view of FIG. III
-A sectional view taken along the line III, Fig. 18 is an enlarged perspective view showing a portion surrounded by a circle A in Fig. 16, and Fig. 19 is a sectional view of Fig. 15.
FIG. 5 is an enlarged perspective view of a portion surrounded by a circle B in the drawing as viewed in the direction of arrow V.

In these figures, 40-1 is IC37a
1 shows a first printed circuit board element, preferably a flexible printed circuit board, on which the etc. are mounted. The first printed circuit board element 40-1 is bonded and arranged on the inner wall surface 2A-1 of the base 22 made of metal. In this case, the reference numerals of the other ICs except IC37a and IC37b (hereinafter referred to as such) are omitted to simplify the explanation of FIGS. 15 to 19.

Further, the first printed circuit board element 40-1
Is a pair of long sides 21-1 and 21-2 located along the longitudinal direction of the tongue portions 21-3 and 21-4, which project outward from one side 21-1 and the other side of the long side 21-1 and 21-2. Side 21-2
It has one tongue portion 21-5 protruding further outward. Furthermore, the first printed circuit board element 40-1 has one tongue portion 21-7 projecting outward from the short side 21-6 thereof. A plurality of terminals 22-1, 22-2, 22-3 and 22-4 are formed on the tongue portions 21-3, 21-4, 21-5 and 21-7, respectively.

The base 22 has a rib-shaped first peripheral portion 2A-2 having a rectangular frame shape over the entire circumference thereof. Further, the first peripheral edge portion 2A-2 has a pair of long sides 2A-2.
-1 and 2A-2-2 and a pair of short sides 2A-2-3 and 2A-2-4. Preferably, this peripheral portion 2A
-2 upper surface 2A-2a has a flat surface.

Further, as illustrated in a particularly enlarged state in FIG. 18, the upper flat surface 2A- of the peripheral edge portion 2A-2 is formed.
Shallow recesses 2A-2b, 2A-2c and 2A at predetermined positions on the long sides 2A-2-1 and 2A-2-2 of 2a.
-2d is formed, and on the other hand, another shallow recess 2A-2e is formed at a predetermined position of the short side 2A-2-3.

Further, in FIG. 18, the tongue portions 21-3, 21
-4, 21-5, and 21-7 are configured to be temporarily raised along the first peripheral edge portion 2A-2 and further bent outward. Further tongues 21-3, 21-4, 21
-5 and 21-7 are long sides 2A-2-1 and 2A-2
-2 and the short side 2A-2-3, and finally the shallow recesses 2A-2b, 2A-2c, 2A-2d and 2
It is within A-2e. The terminals 22-1 to 22-4, that is, the terminals of the first group are arranged so as to be exposed on the upper surface 2A-2a of the first peripheral portion 2A-2.

Further, in FIG. 15 to FIG. 19, 40-2
Is an IC similar to the first printed circuit board element 40-1.
Fig. 7b shows a second printed circuit board element, preferably a flexible printed circuit board, on which 37b etc. are mounted. The second printed circuit board element 40-2 is a cover made of metal.
It is adhered and arranged on the inner wall surface 3A-1 of 23.

Further, the second printed circuit board element 40-2
Of the pair of long sides 20-1 and 20-2 located along the longitudinal direction of the tongue portion 20-3 and 20-4 protruding outward from one side 20-1 and the other of the tongue portions 20-3 and 20-4. Side 20-2
It has one tongue portion 20-5 projecting outward. Further, the second printed circuit board element 40-2 has one tongue portion 20-7 projecting outward from its short side 20-6. A plurality of terminals 23-1, 23-2, 23-3 and 23-4 are formed on the tongue portions 20-3, 20-4, 20-5 and 20-7, respectively.

The cover 23 has a rib-shaped second peripheral portion 3A-2 having a rectangular frame shape over the entire circumference thereof. Further, the second peripheral portion 3A-2 has a pair of long sides 3A-2.
-1 and 3A-2-2 and a pair of short sides 3A-2-3 and 3A-2-4. Preferably, this peripheral portion 3A
-2 upper surface 3A-2a has a flat surface.

Further, similarly to the above-mentioned structure relating to the first peripheral edge portion 2A-2, the upper flat surface 3 of the peripheral edge portion 3A-2 is formed.
Shallow recesses 3A-2b, 3A-2c and 3A-2d are formed at predetermined positions of the long sides 3A-2-1 and 3A-2-2 of A-2a, while the short sides 3A-2-3 of the short sides 3A-2-3 are formed. Another shallow recess 3A-2e is formed at a predetermined position.

The tongue portions 20-3, 20-4, 20-5 and 20
-7 is configured to be temporarily erected along the second peripheral edge portion 3A-2 and further bent outward. Further tongue parts 20-3, 20-4, 20-5 and 20-7
Are long sides 3A-2-1 and 3A-2-2 and short sides 3A-
2-3, and finally the above-mentioned shallow recess 3A-2.
b, 3A-2c, 3A-2d and 3A-2e. The terminals 23-1 to 23-4, that is, the terminals of the second group are arranged so as to be exposed on the upper surface 3A-2a of the second peripheral portion 3A-2.

Further, in this structure, the spindle 25,
The magnetic disk 24, at least one magnetic head 27, at least one arm 28, actuator 29, etc. are the base 22.
Implemented in. The cover 23 is arranged at a predetermined position of the base 22 so that the base 22 is covered with the cover 23. Further, the upper surface 2A-2 of the first peripheral portion 2A-2
a and the upper surface 3A-2a of the second peripheral portion 3A-2 are fixed to each other over the entire circumference by using an anisotropic conductive adhesive 32.

In the state where the cover 23 is connected to the base 22 as described above, the second tongue portion 20-
3, 20-4, 20-5 and 20-7 are base 22 respectively.
Facing the first tongue portions 21-3, 21-4, 21-5 and 21-7 of the second tongue portion 21-3 of the second group of terminals 23-1 to 23-4.
Respectively face the terminals 22-1 to 22-4 of the first group. Therefore, as illustrated in FIG.
The second tongue portions 20-3, 20-4, 20-5 and 20-7
Are shallow recesses 2A-2b and 2A-2 of the base 22, respectively.
c, 2A-2d and 2A-2e, the first tongues 21-3, 21-4, 21- are arranged to be housed in
5 and 21-7 are shallow recesses 3A- of the cover 23, respectively.
2b, 3A-2c, 3A-2d and 3A-2e are arranged to be housed. In such an arrangement,
Second tongues 20-3, 20-4, 20-5 and 20-7 and first
The tongues 21-3, 21-4, 21-5 and 21-7 of the tongue are rigidly bonded to each other using an anisotropic conductive adhesive 32.
Here, all tongues 20-3, 20-4, 20-5, 20-7,
21-3, 21-4, 21-5 and 21-7 can be retained in the corresponding shallow recesses 2A-2b, 3A-3b, etc., respectively, whereby the tongues 20-3, 21-3 are retained.
Do not adversely affect the fixing surfaces of the cover 23 and the base 22. Therefore, the first and second peripheral portions 2A-2 and 3A-2 are adhered to the second peripheral portion 3A-2 substantially completely over the entire circumference of the first peripheral portion 2A-2. Fixed to each other.

Furthermore, as illustrated in FIG. 19, the anisotropic conductive adhesive 32 has the characteristic of being electrically conductive in the direction of the Z axis. That is, the anisotropic conductive adhesive 32
Is pressed between the two tongues in this direction, while it has no electrically conductive property in the directions of the X and Y axes. Therefore, the terminal 23-
1 and the corresponding terminals 22-1 of the base 22 can be electrically connected to each other. In addition, the other terminals 23 of the cover 23
-2, 23-3 and 23-4 can be electrically connected, and corresponding terminals 22-2, 22-3 and 22-4 of the base 22 are similarly electrically connected. be able to.

In the seventh preferred embodiment described above, the entire circumference of the peripheral edge portions 2A-2 and 3A-2 is arranged so as to be covered with the anisotropic conductive adhesive 32. However, as another form, it is also possible to cover only the tongues of the base 22 and the cover 23 with the anisotropic conductive adhesive 32, or the peripheral edge portions 2A-2 and 3A-2 and the tongue. It is also possible to partially cover the part with the anisotropic conductive adhesive 32.

In this case, the printed circuit board is separated into two different elements corresponding to the base 22 and the cover 23 so that the base 22 and the cover 23 can be handled independently of each other. Therefore, in the seventh preferred embodiment,
There is an advantage that the process of mounting the magnetic disk 24, the spindle 25, the magnetic head 27, etc. in the housing 21 is relatively simple. In addition, all tongues are retained in the corresponding shallow recesses so that the base 22 and cover
The 23 can be tightly bonded to each other by the anisotropic conductive adhesive 32 over the entire circumference. Therefore, the seventh preferred embodiment has the additional advantage of being able to ensure a fully closed condition in the housing 21.

FIG. 20 is a view showing a modification of the accommodating portion of the tongue portion in the seventh preferred embodiment of FIG. In FIG. 20, the structure inside the housing 21 is simply illustrated to simplify the description.

As shown in FIG. 20, at least one concave step portion 33 is provided as a tongue accommodating portion only on the side of the cover 23 unlike the configuration of FIG. Further, in FIG. 20, the tongue portions 21-1 of the base 22 and the cover 23 are shown.
And 20-1 are the peripheral edge portion 2A of the concave step portion 33 and the base 22.
-2, the tongue portions 21-1 and 20-1 of the base 22 and the cover 23 are accommodated in the space between the upper surface 2A-2a of the -2 and the upper surface 2A-2a.

FIG. 21 is a diagram showing another modification of the accommodating portion of the tongue portion in the seventh preferred embodiment of FIG. 21st
Also in the drawing, as in FIG. 20, the structure inside the housing 21 is simply illustrated for simplification of the description.

As shown in FIG. 21, at least one convex portion 34 is provided on the peripheral edge portion 3A-2 of the cover 23 as a tongue accommodating portion, unlike the configuration of FIG. Further, in FIG. 21, the tongues of the base 22 and the cover 23 respectively.
21-1 and 20-1 are arranged such that the tongue portions 21-1 and 20-1 of the base 22 and the cover 23 overlap each other in the space between the convex portion 34 and the inner wall surface 2A-1 of the base 22. It is housed in a good condition.

FIG. 22 shows an eighth embodiment of the disk device according to the present invention.
FIG. 3 is a diagram showing a preferred embodiment of FIG. In FIG. 22, the structure of the main part inside the housing 21 is illustrated.

As shown in FIG. 22, the base 22 and the cover 23 manufactured by press-molding a metal plate are
Around the base 22 and the cover 23, the flange portion 2B
a and 3Ba. Further, in FIG. 22, each tongue portion of the flexible printed circuit board elements 40-1 and 40-2 is
The anisotropic conductive adhesive 32 is applied to 21-3 and 20-3, and is held between the two flange portions 2Ba and 3Ba. Finally, the base 22 and the cover 23 have the flange portion 2
By applying pressure F to Ba and 3Ba, they are fixed to each other and adhered to each other.

FIG. 23 is a ninth view of the disk device according to the present invention.
FIG. 3 is a diagram showing a preferred embodiment of FIG. Also in FIG. 23,
As in FIG. 22, the structure of the main part inside the housing 21 is depicted.

As shown in FIG. 23, the base 22 and the cover 23 manufactured by press-molding a metal plate are
Another flange portion 2 around the base 22 and the cover 23
It has Ca and 3Ca. Here, the dimension of the overhang of the one flange portion 2Ca is the same as the other flange portion 2Ca.
It is twice as long as the overhang size of Ca. First, the flexible printed circuit board elements 40-1, 40-2
An anisotropic conductive adhesive 32 is applied to each of the tongue portions 21-3 and 20-3 and is held between the two flange portions 2Ca and 3Ca. Next, as shown in FIG. 23, the former flange portion 2Ca and the latter flange portion 2Ca are folded back so as to cover the latter flange portion 3Ca.
-1 is formed on the upper side of the flange portion 2Ca. Finally, the base 22 and the cover 23 are adhered to each other by applying a pressure F between the flange portion 2Ca and the bent portion 2Ca-1 and fitting the inner flange portion 3Ca into the outer flange portion 2Ca. It is like this. In such a configuration, fitting and bonding of the flange portion are performed at the same time, and electronic components such as ICs 37a and 37b can be firmly sealed in the housing 21 with high reliability.

24 and 25 are views showing a tenth preferred embodiment of the disk device according to the present invention. Specifically, FIG. 24 is a plan view schematically showing the entire disc device, and FIG. 25 is a front sectional view schematically showing the internal structure of the housing.

In these figures, like all the other embodiments described above, preferably 48 mm, ie 1.8.
A printed circuit board such as a magnetic disk 24 having a diameter of 9 inches, a disk drive means 15, a magnetic head 27, a head assembly (head mechanism section) including an actuator 29, an electronic circuit, and a flexible printed circuit board. 14 is contained in a closed space of one housing 21, which housing 21 includes a base 22 and a cover.
23, and has the same outer dimensions as the PCMCIA Type II IC memory card. The connector is omitted in this figure.

Further, in the remaining space other than the movable space in the housing 21 in which the magnetic disk 24, the disk drive means 15, the head assembly, and the other enclosed parts described above can move, the remaining space is Filler 16 having a shape corresponding to the unevenness is provided. Preferably, the filler 16 is made of resin material such as polycarbonate resin or epoxy resin.

In such a structure, the unoccupied space can be made small so as to have the necessary minimum size. Therefore, it is possible to easily prevent the deformation of the housing 21 that may occur due to the application of various external forces, and it is also possible to prevent the unwanted vibration of the components enclosed in the housing 21.

FIG. 26 shows the eleventh embodiment of the disk device according to the present invention.
3 is a cross-sectional view showing a preferred embodiment of FIG. In FIG. 26, the housing relating to the features of the eleventh preferred embodiment.
The structure of the main part inside 21 is drawn.

The construction of the eleventh preferred embodiment described above is similar to the construction of the tenth preferred embodiment described above. However, the configuration of the eleventh preferred embodiment differs from the configuration of the tenth preferred embodiment in the following points.

First, the printed circuit board 14 is divided into a lower printed circuit board portion 14a and an upper printed circuit board portion 14b, and the lower printed circuit board portion 14a and the upper printed circuit board portion 14b are made of flexible printed circuit board material. Alternatively, they are made of a thin printed circuit board material and are separately arranged on the inner wall portions of the base 22 and the cover 23, respectively.

Secondly, the magnetic material 16-1 produced by mixing magnetic powder such as Mn-Zn ferrite with an adhesive made of resin is applied to the outer peripheral surface of the filler 16.

Also in such an arrangement of the eleventh preferred embodiment similar to that of the tenth preferred embodiment,
The deformation of the housing 21 can be surely prevented by the effect of the filling material 16. Where both printed circuit board parts
14a, 14b are usually located closest to the magnetic head, and for that reason these printed circuit board parts 14
Electromagnetic noise may leak from a and 14b. As a result, such electromagnetic noise may be superimposed on the reproduction / recording signal (write / read signal), and the signal / noise ratio (SN ratio) may be reduced. However, the
In the eleventh preferred embodiment, the magnetic material 16-1 behaves so as to electromagnetically shield electromagnetic noise, so that the signal / noise ratio (SN ratio) can be prevented from lowering.

FIG. 27 shows a twelfth embodiment of the disk device according to the present invention.
3 is a cross-sectional view showing a preferred embodiment of FIG. Also in FIG. 27, the housing relating to the features of the twelfth preferred embodiment.
Only the structure of the main part inside 21 is drawn.

The construction of the twelfth preferred embodiment described above is similar to the construction of the tenth and eleventh preferred embodiments described above. However, the configuration of the former eleventh preferred embodiment is such that the conductive filler 16-2 formed by including a conductive material in an insulative filler such as a polycarbonate resin or an epoxy resin is used in the housing 21 as described above. It is different from the latter embodiment in that it is arranged in the above space.

In such a twelfth preferred embodiment, similarly to the eleventh preferred embodiment, the deformation of the housing 21 can be surely prevented by the effect of the conductive filler 16-2. Furthermore, also in the configuration of the twelfth preferred embodiment, similar to the eleventh preferred embodiment, the conductive filler is used.
The 16-2 also behaves so as to electromagnetically shield electromagnetic noise, so that the signal / noise ratio (SN ratio) can be prevented from decreasing.

FIG. 28 shows a disk device according to the thirteenth embodiment of the present invention.
3 is a cross-sectional view showing a preferred embodiment of FIG. Also in FIG. 28, the main part of the housing 21 is depicted.

In FIG. 28, an elastic adhesive film 16-3 made of an elastic adhesive containing rubber or the like is applied on the outermost peripheral surface of the filler 16. Further, the filler 16 enclosed in the elastic adhesive film 16-3 is arranged in the above-mentioned space of the housing 21. In such a configuration, the filler 16 can be well adapted to the members enclosed in the base 22, the cover 23 and the housing 21 by virtue of the elastic adhesive film 16-3. Therefore, the thirteenth preferred embodiment has the advantage that the vibration of the filling material 16 that occurs during operation of the disk device can be completely prevented.

FIG. 29 shows a disk device according to the 14th embodiment of the present invention.
3 is a cross-sectional view showing a preferred embodiment of FIG. Also in FIG. 29, the main part of the housing 21 is depicted.

In FIG. 29, at least one signal lead wire 14-1 corresponds to the predetermined positions of the lower and upper printed circuit board parts 14a and 14b as described in FIG. Filled with filler 16. Further, the filler 16 is arranged in the space described above, as in the thirteenth preferred embodiment. In such a configuration, similarly to the tenth preferred embodiment described in FIG. 25, it is possible to easily prevent the deformation of the housing 21 that may occur due to the application of external force. further,
The wiring connection required individually in the lower printed circuit board portion 14a or the upper printed circuit board portion 14b and the wiring connection between the lower and upper printed circuit board portions 14a and 14b can be simultaneously realized.

FIGS. 30, 31, 32, 33 and 34 are views showing a fifteenth preferred embodiment of the disk device according to the present invention. Specifically, FIG. 30 is an exploded perspective view schematically showing the essential structure, FIG. 31 is an enlarged sectional view schematically showing the essential structure, and FIG. 32 is a disk in more detail. FIG. 34 is an exploded perspective view showing the device, FIG. 33 is a perspective view showing the inside of the disc device, and FIG. 34 is an enlarged sectional view showing a main part of the disc device in more detail.

As shown in these figures, in the fifteenth preferred embodiment, the disk device 20 is composed of a base 22 and a cover 23 as in the other embodiments described above,
Similar to PCMCIA Type II IC memory card, approximately 8
It has one rectangular thin housing 21 with outer dimensions of 5.6 mm x 54 mm x 5 mm. More specifically, each of the base 22 and the cover 23 is manufactured by forming a metal plate with a height of 4 to 5 mm by drawing into a container shape. Typically, the base 22 has a height of 3 mm,
The height of the cover 23 is 2 mm. The base 22 and the cover 23 are formed by drawing a steel plate having a thickness of 0.4 to 0.5 mm into a container shape with one side open, and therefore, if such a base 22 and cover 23 are combined together, The overall height, ie the thickness dimension of the rectangular housing 21, is 5 mm.

Here, the reason why the base height and the cover height are changed will be described. As mentioned above, PCMCIA-
According to the Type II standard, both sides of the long side serve as insertion guides for the host computer, so 3.3.
Limited to mm. This portion spans the outer diameter of the disc, which is 1.89 inches or 48 mm in diameter, so the disc is preferably centered in thickness. Corresponding to this disc arrangement, the base and the cover are required to have a half-moon type relief as shown in FIG. 48 (A) described later.
This complicated drawing reduces the area of the flange surface,
It reduces the strength of the base or cover and the bond strength of both. In order to avoid this, the height of the base and cover was shifted to secure the thinner flange surface. Since the electronic components mounted on the inner wall of the base / cover have substantially the same maximum height on the base side and the cover side, it is desirable to dispose the disc at the center of the housing thickness.

Further, a space for fixing the connector 42 is provided on one of the shorter sides of the rectangular housing 21. As shown in FIG. 34, according to a feature of the fifteenth preferred embodiment, on the other short side and two long sides of the housing 21, said base 22 and cover are provided.
Coupling flanges 12-1 and 12-2 extending outward are provided at the outer peripheral portion of 23, respectively.

Similar to the previously described embodiment, eg, the first preferred embodiment shown in FIGS. 3-9, the rectangular housing 21 includes at least one magnetic disk 24, a spindle motor 26, and at least one magnetic disk 24. One magnetic head 27, at least one arm 28, actuator 29, electronic component 70
Etc. are included. Here, the actuator 29 includes a magnet part 29a composed of at least one permanent magnet, a yoke part 29c arranged so as to enclose the permanent magnet, and a movable coil part arranged inside the yoke part 29c. 29b
Is equipped with. Here, detailed description of the disk device other than the coupling flanges 12-1 and 12-2 is omitted for clarifying the features of the fifteenth preferred embodiment.

As shown typically in FIG. 32, the base
The base 22 and the cover 23 are joined to the cover 23 by overlapping the corresponding joint flanges 12-1 and 12-2, respectively. In addition, such coupling flanges 12-1, 12-2 may be used if the base 22 and cover
When both 23 are made of iron, they are preferably seamed and secured together by spot welding. Alternatively, if it is seam welding in which spot welding is continuously performed, a certain degree of hermeticity is guaranteed. If the base and cover are made of metal or resin material other than iron, these coupling flanges are joined by means such as winding, screwing, riveting and the like. Of course, for iron-based metals,
It goes without saying that it is possible to combine by such means.
If both base 22 and cover 23 are made of aluminum or a resin material, these coupling flanges 12-1, 12-2 are preferably joined by screws or rivets. It is fixed. Furthermore, the joint flanges 12-1, which are joined together,
A frame composed of a pair of L-shaped frame elements 13a and 13b is added to the outer peripheral portion of 12-2 so that the joint flanges 12-1 and 12-2 joined together can be pressed and tightly sealed. ing. Each of these L-shaped frame elements 13a, 13b is, for example, A
It is made of a material called engineering plastic such as BS resin, hard urethane rubber, polyamide resin or polyphenylene sulfide resin. As shown in FIG. 31 and FIG.
Take a cross-sectional shape having a recess corresponding to the outer shape of 12-2. At this time, the L-shaped frame elements 13a and 13b are bonded by using an adhesive, or the frame elements 13a and 13b are bonded.
Is welded to the joined joint flanges 12-1, 12-2 of the housing 21 and functions as a sealing means, thus ensuring that the interior of the housing 21 remains sealed. .

With such a structure, the mechanical strength of the housing 21 and the integrity of the housing 21 due to the coupling of the coupling flanges 12-1 and 12-2 as described above are significantly improved. Further, since the L-shaped frame elements 13a and 13b act as a cushioning means against a mechanical shock caused by an external factor such as a drop of the disc device 20, it is possible to prevent the housing 21 from being deformed or damaged. Become.

Further, the disk device 20 is PCMCIA Ty.
Since it has the same size as the peII IC memory card, compatibility with the currently used IC memory card can be ensured and it can be connected to an external host device such as a host computer. In this case, each of the L-shaped frame elements 13a and 13b functions as an insertion guide rail for guiding the housing 21 of the disk device 20 to the host computer, so that the housing 21 can be easily inserted into the host computer.

FIG. 35 is a sectional view of the 16th embodiment of the disk drive structure according to the present invention. FIG. 35 shows only the main part of the structure inside the housing 21 relevant to the features of the sixteenth embodiment.

The structure of the 16th embodiment is the same as the structure of the 15th embodiment described above. However, the structure of the 16th embodiment is different from that of the 15th embodiment in that the frame 13 is formed of metal frame elements 33a and 33b instead of the resin frame elements 13a and 13b. In this case, each of the metal frame elements 33a and 33b described above is directly attached to the combined coupling flanges 12-1 and 12-2 of the housing 21 and by applying a predetermined pressure to the metal frame elements 33a and 33b. Will be finally fixed to.

With such a structure, as in the fifteenth embodiment, the coupling flanges 12-1 and 12-2 are provided with the frame 13.
There is no need for the process of joining the. Therefore, the fixing process of the frame 13 is simplified as a whole and the disk device assembling cost is reduced.

FIG. 36 is a sectional view of the seventeenth embodiment of the disk drive structure according to the present invention. FIG. 36 also shows
Only the main part of the structure inside the housing 21 relevant to the features of the second embodiment is shown.

The structure of the 17th embodiment is the same as the structure of the 16th embodiment described above. However, the structure of the seventeenth embodiment is different from the structure of the sixteenth embodiment in that the frame 13 is made of rubber, each of which has a recess, and the frame elements 34a and 34b are made of metal.
The difference is that it is a double structure in which it is covered with a and 33b. In this case, the rubber frame elements 34a and 34b are first attached to the joining flanges 12-1 and 12-2 combined by a gum containing an adhesive. The metal frame elements 33a and 33b are then directly attached to the rubber frame elements 34a and 34b. Finally, the metal frame elements 33a and 33b described above are firmly fixed by applying a predetermined pressure to the metal frame elements 33a and 33b to the rubber frame elements 34a and 34b and the coupling flanges 12-1 and 12-2. To be done.

In the structure of the seventeenth embodiment as described above, two types of frame elements which are separately attached due to the double structure of the frame are required, and the steps of attaching the frame are the fifteenth and sixteenth. More than in the second embodiment. However, in the seventeenth embodiment, the degree of coupling of the combined coupling flanges 12-1 and 12-2 is first.
Higher than in the fifteenth and sixteenth embodiments, the mechanical impact caused by the dropping of the disk drive is more effectively absorbed by the rubber frame elements 34a and 34b than in the previous embodiments.

Furthermore, in this case, the rubber frame elements 34a and 34b and the metal frame elements 33a and 33b can be integrally formed in advance. Therefore, this integrated product can be easily attached to the outer peripheral portions of the combined coupling flanges 12-1 and 12-2.

FIG. 37 is a sectional view of the eighteenth embodiment of the disk drive structure according to the present invention. Fig. 37 also shows 18
Only the main part of the structure inside the housing 21 relevant to the features of the second embodiment is shown.

The structure of the 18th embodiment is similar to that of the 17th embodiment described above.
The structure is the same as that of the second embodiment. However, the structure of the eighteenth embodiment is compared with the structure of the seventeenth embodiment in the metal frame elements 33a and 33b of the previous embodiment.
The difference is that each of the recesses is formed deeper and the bottoms of the metal frame elements 33a and 33b are filled with rubber frame elements 34a and 34b. With such a structure, the metal frame elements 33a and 33b are attached to the combined connecting flanges 12-1 and 12-2, and the rubber frame elements 34a and 34b are combined connecting flanges 12-1 and 12-2. It is crimped firmly so that it touches the outside of. The 18th embodiment described above has the same advantages as the 17th embodiment described above.

FIG. 38 is a view showing another example of the frame applied to the disk device according to the present invention as shown in FIG. In the fifteenth to eighteenth embodiments described above, examples of use of a pair of L-shaped frame elements have been shown. However, it is also possible to use a single U-shaped frame element as shown in FIG. 38 instead of a pair of L-shaped frame elements. Although not shown in the figure, the base and the cover can be joined by this frame alone or by using a frame and an adhesive together without using welding, tightening, screws, rivets, etc. as described in FIG. Is.

As described above, in all of the embodiments relating to the structure of the disk device according to the present invention, when an excessively large external force is applied, the base cover is easily deformed because a relatively thin plate material is used. It is desirable to use at least one reinforcing stud in the thickness direction of the base 22 and the cover 23. By using the above-mentioned reinforcement stud,
It is possible to sufficiently secure the mechanical strength of the housing 21 in the thickness direction against an excessively large external force.

Further, in the above-mentioned embodiment relating to the disk device structure according to the present invention, the embodiment for the magnetic disk device is shown. However, the present invention is also applicable to magneto-optical disks and optical disks.
Of course, in all the embodiments described below, it is possible to use a magneto-optical disk device and an optical disk device instead of the magnetic disk device.

The structure of the spindle of the disk device according to the present invention will be described below with reference to FIGS. 39 to 49. The structure of the part including the bearing means of the head actuator is also essentially the same as the structure described below, and therefore will be omitted.

As described above, the disk device of the present invention is very thin with a thickness of 5 mm or less, and the base 22 and the cover 23 constituting the housing are thin plates of 0.4 mm to 0.5 mm, and most preferably. Since the steel plate is formed by pressing, it is essentially weak against external force in the thickness direction.
As mentioned above, the base /
Attempts have been made to raise studs between the covers, but the existing portion of disk 24 and the portion where the actuator moves cannot be provided with such reinforcement. Therefore, a structure is preferably implemented in which the central axis of the spindle and the central axis of the actuator are the outer ring rotating type having the fixed shaft 18 which plays the role of the stud described above.

FIG. 42 is a view showing the structure of a preferable spindle of the present invention. The magnetic disk 24 is held by the spindle hub 11, and the spindle hub 11 further includes bearing means.
It is supported by the fixed shaft 18 via 26-2. This fixed shaft 18
Is caulked and fixed to the base 22. In addition to this, the fixing method of the fixed shaft to the base includes means such as welding, press fitting, adhesion, and screwing, which will be described later. On the other hand, the spindle motor 26 has a rotor magnet 26-3 in the recess of the spindle hub 11 and a stator coil 26-4 fixed to the base 22 and facing the rotor magnet 26-3, and rotates the disk.

First, the structure of the fixed shaft 18 shown in FIG. 42 will be described in detail with reference to FIGS. 48 and 49. First
As shown in Fig. 49, the fixed shaft 18 has a bearing mounting portion,
It is composed of a thin flange portion 18e at the lower portion and a caulking portion 18f at the lower portion. This caulking part 18f is the base 22
Insert it into the specified hole of the cold rivetting,
Alternatively, it is fixed to the base 22 by hot riveting.

The flange portion 18e of the fixed shaft 18 has two functions described below. The first function is that the presence of the flange allows the fixed shaft to stand upright perpendicular to the base surface with high accuracy. The second function is to serve as a reference surface for the bearing means. In the disk device according to the present invention, since the thickness of the housing is 5 mm or less, the bearing means 26-2
The distance between the pair of bearings is extremely short. The larger the distance between the upper and lower bearings is, the better the accuracy of tilting of the disc can be. However, in the disc device of the present invention, as shown in FIG. 42, the upper and lower bearings are almost in contact with each other. Cannot secure a certain distance. Therefore, in the present invention, the fixed shaft
With the upper surface of the flange 18e of 18 as a dimensional reference, the lower end surface of the inner ring of the bearing is brought into contact with this portion to ensure good tilt accuracy. To better achieve this,
It is desirable to make the outer diameter of the flange portion as large as possible. In this embodiment, the outer diameter of the flange is the bearing means 26-2.
Is set to a value approximately equal to or larger than the average distance S between the pair of bearings.

The means for connecting the fixed shaft 18 and the cover 23 will be described later.

FIG. 43 is a diagram for explaining preloading of the bearing means in FIG. 42. In this case, the first and second bearing means can have substantially the same structure as each other.

As described above, the distance between the pair of bearings of the bearing means is extremely short due to the restriction of the thickness of the housing, and sufficient moment rigidity cannot be obtained. For this reason, as shown in FIG. 43, a preload means such as a spring 26b for applying a constant load in the axial direction is provided between the upper and lower outer rings of the bearing means. Here, the two extrapolation lines connect the points where the rolling elements 26a contact the outer ring and the inner ring, respectively, and the distance between the two intersections where the two extrapolation lines intersect the rotation center of the spindle. C is
With the preloading means shown in the embodiment, it is possible to make it longer than the average distance S between the pair of bearings of the bearing means. In FIG. 43, the distance C is about twice the average distance S, so that about twice the moment rigidity is obtained.

Next, a preferred embodiment of the bearing means will be described with reference to FIG. In this embodiment, a shaft-integrated bearing in which the upper and lower inner rings are integrated is used. With such a bearing structure, it is possible to obtain a longer accuracy than a conventional combination of bearings separated from each other. In addition, mounting on the fixed shaft 18 is performed by simply inserting the hollow hole (inner diameter) of the integrated inner ring into the fixed shaft and adhering it. Therefore, it is possible to separately perform the means for applying a preload and the fixing to the fixed shaft 18. it can.

As shown in FIG. 50, the shaft corresponding to the inner ring of the shaft-integrated bearing can be directly fixed to the base without providing the hollow hole as shown in FIG. Is. However, this method has the following problems. First of all
In addition, it is difficult to machine flanges and other parts because high precision is required for the parts that make up the bearing. Secondly, since the bearing material is required to have high hardness, it cannot be assembled with plastic deformation such as caulking. Therefore, in this case, means such as screwing and light press-fitting are taken, but it is difficult to obtain high fastening strength by these means.

Next, a method of fixing the fixed shaft 18 to the base 22 by welding will be described with reference to FIG. 42nd
The figure is a diagram for explaining the caulking fixation, but since the appearance is almost the same, the figure is used.

First, in the first method, the lower end of the fixed shaft 18 inserted into the through hole of the base 22 and the inner edge of the through hole are fixed by laser spot welding.

In the second method, the portion corresponding to the fixed shaft flange portion around the through hole is fixed from the lower surface of the base by laser spot welding.

The third method is to fix the lower surface of the flange, that is, the lower end surface of the fixed shaft 18 by spot welding to the lower surface of the base without forming a through hole in the base 22 and the base insertion portion in the fixed shaft 18. To do.

The fixing method by welding the base 22 and the fixed shaft 18 described above can be directly replaced by the fixing method by adhesion. However, it goes without saying that the bond strength due to adhesion is inferior to that due to welding.

Next, an embodiment different from the method shown in FIG. 42 for fixing the fixed shaft will be described below.

FIG. 39 is a diagram showing a second embodiment of the fixed shaft structure of the disk device of the present invention. In this embodiment, the substantial fixed shaft is a hollow shaft 26-1 which is fitted and adhered to the pin 15-1 which is fixed to the base 22 by caulking and stands upright on the base 22. On the other hand, the second pin 15-2 paired with the first pin 15-1 has the same diameter as the first pin 15-1 and further has a flange portion. Second pin
15-2 is inserted into the stepped hole of the cover 23 from the outer surface of the cover 23, and is joined to the fixed shaft 26-1 by an adhesive. The cover 23 is fixed by adhesion or spot welding. Unlike FIG. 42, in FIG. 39, a pair of bearings 26-2 whose inner rings are separated is used for the bearing means without using a shaft-integrated bearing, and the shaft is bonded and fixed to the fixed shaft 26-1. .

FIG. 40 is a view showing a third preferred embodiment of the fixed shaft structure of the disk device of the present invention. Also,
As in FIG. 39, an enlarged schematic sectional view of the fixed shaft structure in the spindle motor 26 is typically illustrated in FIG. 40.

The structure of the third preferred embodiment is different from that of the second preferred embodiment in that two pins 15-1, 15- are used.
One pin 15-3 having the shape shown in the figure is used instead of 2, and is fixed to the base 22 by welding, while it is fixed to the cover 23 by plastically deforming the pin 15-3. To do.

More specifically, in the first stage, the pin 15-3 is penetrated through the hole having the stepped portion of the base 22. In the next step, the flange portion of the pin 15-3 is fixed to the bottom surface of the stepped portion of the base by electric spot welding or laser spot welding. Furthermore, bearing means
The fixed shaft 26-1 to which 26-2 is adhered is inserted and adhered to the pin 15-3. At the final stage, pins 15-3
Is inserted into the stepped hole of the cover 23, and the pin 15
The cover 23 is fixed by crushing the head of -3 by plastic working.

FIG. 41 is a view showing a fourth preferred embodiment of the fixed shaft structure of the disk device of the present invention. Also,
In FIG. 41, similarly to FIG. 39, an enlarged schematic sectional view of a fixed shaft structure in the spindle motor 26 is typically illustrated.

The structure of the fourth preferred embodiment differs from that of the third embodiment in that the bearing means has a structure in which the inner ring and the outer ring are integrated.
This bearing structure differs from the structure of the shaft integrated bearing shown in FIG. 42 in that not only the inner ring but also the outer ring is integrated, and a pre-positioned value preload is applied when the inner ring, balls, and outer ring are assembled. . For this reason, preloading and accuracy control at the stage of assembling the disk device are unnecessary, and the rotation accuracy of the spindle is improved.

FIG. 44 is a view showing a fifth preferred embodiment of the fixed shaft structure of the disk device of the present invention. This embodiment is different from the first to fourth embodiments in that the fixed shaft 18
The method of connecting the above to the base 22 is that the screw 43 is used, and the bearing means 26-2 that is not a shaft integral type is directly bonded to the solid (solid) fixed shaft 18.

Next, the connecting structure of the fixed shaft 18 and the cover 23 will be described.

FIG. 45 is a view showing the internal structure of the housing when the cover 23 is removed, and the spindle fixing shaft 18
The front end of the actuator and the front end of the actuator fixed shaft 45 are illustrated.

FIG. 46 is a view showing a preferred embodiment in which the fixed shaft 18 of the disk device of the present invention described in FIG. 42 is connected to the cover 23. The fixed shaft 18 and base are shown in Fig. 46.
Although the connection portion of 22 is different from that of FIG. 42, the connection with the cover 23 is the same, so it is considered that there is no problem in using it for the explanation. The same applies to the coupling between the fixed shaft 45 of the actuator and the cover 23, and the description thereof will be omitted.

A stepped portion 18c is formed on the upper portion of the fixed shaft 18, and a small diameter portion 18d having a diameter d smaller than the diameter D of the fixed shaft 18 is projected on the tip of the fixed shaft 18 at the upper portion of the stepped portion 18c. ing.

Further, the length T from the bottom surface 18a of the fixed shaft 18 (the lower surface of the flange 18f in FIG. 42) to the stepped portion 18c.
₁ is the distance L ₂ between the upper surface 22b of the base 22 and the lower surface of the cover 23
Slightly larger (about 0.02 to 0.06 in this embodiment)
mm). In addition, the insertion hole 22 provided in the base 22
A through hole 23b is previously formed in a portion of the cover 23 facing the c. In this embodiment, the inner diameter D ₁ of the through hole 23b is smaller than the outer diameter D of the fixed shaft 18 and the small diameter portion at the tip of the fixed shaft.
It is made larger than the diameter d of 18d (D> D ₁ > d).
As described above, when the cover 23 is attached to the base 22, the small diameter portion 18d of the fixed shaft 18 can be inserted into the through hole 23b of the cover 23.

As described above, since the outer diameter D of the fixed shaft 18 is larger than the inner diameter D ₁ of the through hole 23b, the step portion 18c of the fixed shaft 18 can contact the lower surface 18c of the cover 23.
Further, the length T ₁ from the bottom surface 18a through the step portion 18c is made slightly larger than the distance L ₂ between the upper surface 22b of the base 22 and the lower surface of the cover 23, so that the fixed shaft 18 covers the cover. It acts to lift the peripheral portion of the through hole 23b of 23 upward. Therefore, the top plate 23a of the cover 23 is pressed upward and slightly deformed to have a bent shape as shown in FIG. The cover 23 is thus in the form of a diaphragm, by pressing the step portion 18c of the fixed shaft 18 downward,
Configured to hold 18.

In this state, the adhesive 44 functioning as a fixing means and a sealing means is injected from the upper side of the cover 23 into the space between the through hole 23b and the small-diameter portion 18d, whereby the cover 23 is covered with the adhesive 44. It is adhered to the fixed shaft 18 by heat treatment or ultraviolet irradiation. Preferably, an epoxy elastic adhesive having high viscosity and low hardness after heat treatment is used as the adhesive 44 shown in FIGS. 44 and 46. In this case, if the viscosity of the adhesive 44 is sufficiently high, it is possible to prevent the adhesive 44 from entering the cover 23 even when the adhesive 44 is injected into the through hole 23b. . Furthermore, if the hardness of the adhesive 44 after the heat treatment is sufficiently low, the small diameter portion 18d of the fixed shaft 18 can be elastically fixed to the through hole 23b via the adhesive 44. Further, the injection of the adhesive 44 closes the through hole 23b, and therefore dust in the air can be prevented from entering the cover 23. Therefore, it is possible to prevent dust from adhering to the magnetic disk 24 or the magnetic head 27 and damaging the surface thereof with dust.

In other words, in the fourth embodiment as shown in FIGS. 44 to 46, the fixed shaft 18 is
By pressing the step portion 18c of the housing downward, it is rigidly connected to the cover 23 in the thickness direction of the housing 21, and by using an elastic adhesive, it is flexibly connected to the cover 23 in the in-plane direction. Is configured to be. With this configuration, the thermal stress and the like that may occur when the fixed shaft 18 is rigidly fixed to both the base 22 and the cover 23 in all directions can be reliably alleviated.

More specifically, the cover 23 is mounted on the base 22 and further fixed by an adhesive, whereby the upper portion of the fixed shaft 18 can be securely fixed to the cover 23. In this case, since the small-diameter portion 18d is fitted in the through hole 23b with an appropriate margin, the fixed shaft 18d
However, it can be prevented from tilting by fixing with screws as in the prior art. Therefore, even an inexperienced person can relatively easily perform the work of attaching the cover 23 on the base 22. Further, the state in which the fixed shaft 18 is perpendicular to the base 22 can be maintained even after the cover 23 is fixed to the base 22. Therefore, the spindle hub 11 and the disk 24 attached to the fixed shaft 18 can be prevented from tilting, and the spindle hub 11 and the disk 24 can be stably supported at a predetermined position by the fixed shaft 18. In this way, the relative positions of the two magnetic heads 27 with respect to the magnetic disk 24 can be controlled with high accuracy.
The tracking control in the reproducing or recording operation can be performed more accurately than in the case of the conventional technique, and the demand for higher magnetic recording density can be satisfied.

Further, the above-mentioned mounting structure of the fixed shaft 18 of the spindle can be applied to the fixed shaft 45 of the actuator. That is, since the fixed shaft 45 of the actuator has substantially the same mounting structure as the fixed shaft 18 of the spindle, detailed description of the fixed shaft 45 is omitted here.
In summary, the actuator fixed shaft 45, together with the fixed shaft 18, stands vertically on the base 22 without tilting. Therefore, the arm 28 can be prevented from tilting, and positional error of the magnetic head 27 with respect to the upper and lower surfaces of the disk 24 can be avoided.

FIG. 47 shows a modification of the shaft-cover mounting structure in the embodiment shown in FIG. In this example, the main part of the mounting structure of the shaft and the cover is shown enlarged.

In FIG. 47, instead of the adhesive 44, an elastic sealing member such as a rubber O-ring 44-1 is provided between the small diameter portion 18 d of the fixed main shaft 18 and the through hole 23 b of the cover 23. Is located in. In this example, since the O-ring 44-1 has elasticity, by applying pressure on the O-ring 44-1 from its inner and outer portions, the O-ring 44-1 is deformed into an elliptical shape. . In this state, the O-ring 44-1 is closely attached to the outer circumference of the small diameter portion 18d and the inner circumference of the through hole 23b without any gap, so that the space between the small diameter portion 18d and the through hole 23b is reliably sealed. The elasticity of the O-ring 44-1 can prevent dust in the air from entering the cover 23. Therefore, similarly to the embodiment shown in FIG. 46, it is possible to prevent dust from adhering to the magnetic disk 24 and the magnetic head 27 and damaging their surfaces.

Another example of connecting the fixed shaft 18 to the cover 23 without tilting it as shown in FIG. 46 is a welding method. For example, as shown in FIG. 43, the fixed shaft 18 (26-1) does not have a step on the upper end surface thereof and has no through hole in the cover 23. With the base 22 and the cover 23 fastened together, the upper end of the fixed shaft 18 contacts the cover 23. When there is no contact due to dimensional tolerance, the cover 23 is lightly pressed. In this state, spot welding is performed from the upper surface of the cover 23. The welding of the cover 23 is the final stage of assembly, and the electronic components are housed inside. Therefore, laser welding is preferable to electric welding. By doing so, the fixed shaft 18 and the cover 23 are securely fixed to each other without applying a force in the falling direction to the fixed shaft 18.

A number of concrete examples of the entire mechanism of the spindle motor of the disk device according to the present invention will be described below.
This will be described with reference to FIGS. 50 to 57.

FIG. 50 is a view showing a first preferred example of the entire mechanism of the spindle motor of the disk device according to the present invention.

FIG. 50 shows the main part of the spindle motor mechanism relating to the characteristic parts of the first embodiment.

As shown in FIG. 50, the spindle 25 is fixed to the base 22 and the cover 23 so that the spindle motor 26 itself is held at a predetermined position in the housing 21, and therefore, One magnetic disk 24
Is configured to rotate.

A pair of first bearing means 26-2 (hereinafter, the first notation is omitted) is fixed around the spindle 25 to support the spindle 25.

Further, the spindle hub 11 has an outer edge portion which engages with the central opening portion of the magnetic disk 24, and is rotatably attached to the spindle 25 through the bearing means 26-2. It has an inner edge.

In this example, the rotor magnet 26-
3 is provided on the spindle hub 11, and the rotor magnet is composed of a permanent magnet formed in a flat plate shape.
It is magnetized in the axial direction of the spindle 25.

On the other hand, the rotor magnet is fitted in a recess provided in the bottom surface of the spindle hub 11, and finally joined to the recess.

In the first embodiment described above, the spindle hub 11 is made of a soft magnetic material so that it can be used as a yoke.

Alternatively, if a non-magnetic material is used for the spindle hub 11, the rotor magnet 26-3 may be joined to the spindle hub 11 via another yoke.

In this case, the bearing means 26-
The outer ring rotating motor, in which the outer ring in 2 rotates, is used as the spindle motor 25.

Further, the stator coil 26-4 is fixed to the upper wall surface of the base 22 inside the housing 21, so that the stator coil 26-4 is separated from the rotor magnet by a certain axial gap. It will be provided opposite to 26-3.

More specifically, the rotor magnet 26-3 is disposed between the position of the inner diameter portion of the magnetic disk 24 and the position of the outer peripheral edge portion of the bearing means in the radial direction of the rotor magnet 26-3. Positioned.

The base forming a part of the housing 21
22 is made of a soft magnetic material and operates as a stator yoke.

Here, the stator coil 26-4 is arranged inside the housing 21 so as to project into the space with the magnetic disk 24.

In the above configuration of the spindle motor, for example, a flat plate type motor and the rotor magnet 26 are used.
-3 and the stator coil 26-4, a face-to-face type motor utilizing the magnetic flux in the axial direction of the spindle is formed, and the spindle hub 11 and the magnetic disk 24 are
As the rotor magnet 26-3 rotates, it rotates integrally with the rotor magnet.

In such a case, the thickness of the spindle motor itself can be made extremely small. By using a face-to-face type (axial gap) motor,
As shown in the figure, it is possible to use the bearings almost overlaid on the inside of the motor, and it is possible to make the outer diameter of the motor smaller than the inner diameter of the disk, and a device having a thickness of 5 mm or less can be realized.

Furthermore, since at least the base 22 is made of a soft magnetic material and also serves as a yoke, the disk device can achieve excellent characteristics of smaller size and lighter weight than the conventional example. It will be possible.

In particular, the above structure can be effectively applied to a disk device using a small number of magnetic disks.

FIG. 51 is a view showing a second preferred example of the entire mechanism of the spindle motor in the disk device according to the present invention.

FIG. 51 also shows the main part of the spindle motor mechanism.

The structure of the second preferred embodiment is as follows.
It is similar to the configuration of the first preferred embodiment shown in FIG.

However, the second specific example is different from the first specific example in that the spindle hub 11 and the base 22 are different from each other.
That is, each of the cover 23 and the cover 23 is made of a non-magnetic material.

In this case, the rotor magnet 26-3
Is thicker than the rotor magnet shown in FIG. 50, and the cover side stator yoke is used for the magnetic path instead of the rotor yoke.

By arranging the rotor magnet 26-3 in such a manner, the effective magnetic flux is increased, and a motor having the same salient features as the first embodiment shown in FIG. 50 is obtained. It is what is done.

A stator yoke 26-10 is provided on the lower wall surface of the cover 23 at a position facing the stator coil 26-4 via the spindle hub 11.

Further, as described above, since the base 22 is made of a non-magnetic material, the bush 22-10 that operates as another stator yoke is fixed to the base 22 by the screw 22-11. Therefore, an effective magnetic flux can be obtained.

The method of fixing the stator yoke to the base 22 can be applied to other specific examples using the stator yoke.

In the above-mentioned second embodiment, since the spindle hub 11, the base 22 and the cover 23 are made of a non-magnetic material, the stator yoke is fixed to the base 22 and the cover 23. Process is required.

However, if the above-mentioned spindle hub 11, base 22 and cover 23 are made of a non-magnetic material such as aluminum, which has a smaller specific gravity than the conventional soft magnetic material, The second example is effective in that the moment of inertia in each of the rotating elements such as the spindle hub 11 and the rotor magnet 26-3 can be reduced.

Further, since the above rotary element is not used as a yoke, there is another advantage that the thickness of the spindle hub or the like can be made smaller than the thickness in the first concrete example shown in FIG.

FIG. 52 is a diagram showing a third preferred example of the entire mechanism of the spindle motor in the disk device according to the present invention.

FIG. 52 also shows the main part of the spindle motor mechanism.

The construction of the third preferred embodiment is as follows:
It is similar to the configuration of the first preferred embodiment shown in FIG.

However, the difference between the third specific example and the first specific example is that two rotor magnets 11-1 and 11- are magnetized in the same direction as the axial direction of the spindle 25.
2 are fixedly provided on the upper side surface and the lower side surface of the spindle hub 11, respectively.

Further, the lower stator coil 26-4a is fixed to the upper side wall surface of the base 22 in the housing 21, whereby the lower stator coil 26-4a is fixed.
4a has a certain axial gap and closely faces the lower rotor magnet 11-1.

On the other hand, the upper stator coil 26-4b is fixed to the lower side wall surface of the cover 23, so that the upper stator coil 26-4b has a certain axial gap and the upper rotor magnet 11-. 2 closely faces and opposes.

As described above, in the third specific example, the two stator coils 26-4a and 26-4b, the base 22 and the cover 23 that operate as stator yokes are individually formed into the thickness of the spindle hub 11. The spindle hub 11 is arranged at positions symmetrical to each other with respect to the center in the direction.

Therefore, the two rotor magnets 11-
Two types of magnetic attraction forces generated between 1 and 11-2 and between the corresponding base 22 and cover 23 are balanced with each other.

Therefore, the thrust load of the bearing means 26-2 can be reduced and the life of the disk device can be extended.

Furthermore, in the third specific example, 2
Since the two face-to-face type motors are equivalently present, a relatively large torque can be obtained.

Further, since the stator coil is divided into the lower stator coil 26-4a and the upper stator coil 26-4b, the two stator coils are connected to each other, so that the two stator coils can be sufficiently connected at the time of starting the motor. It is possible to generate a large torque of one of the stator coils while separating one of the stator coils from the other stator coil, thereby reducing the counter electromotive force during stable rotation of the motor. This makes it possible to rotate the magnetic disk at high speed.

FIG. 53 is a diagram showing a fourth preferred example of the entire mechanism of the spindle motor in the disk device according to the present invention.

FIG. 53 also shows the main part of the spindle motor mechanism.

The construction of the fourth preferred embodiment is as follows:
It is similar to the configuration of the second preferred embodiment shown in FIG.

However, the difference between the fourth specific example and the second specific example is that the rotor magnet 26-7 is constituted by an annular permanent magnet, and the inner peripheral edge thereof is not the spindle hub. It is rotatably held by the spindle 25 through the bearing means 26-2.

Further, the outer peripheral edge of the rotor magnet 26-7 is constructed so that it can be fitted into the central hole of the magnetic disk 24.

In other words, the rotor magnet 26-7 in the fourth embodiment shown in FIG. 53 also operates in the same manner as the spindle hub.

Further, the cover 23 is made of a soft magnetic material and has a shape so as to be close to the rotor magnet 26-7 at an interval as short as possible. The reference numeral 23 operates as a stator yoke instead of the rotor yoke.

With such a structure, it is possible to reduce a relatively large mechanical element such as the spindle hub, and thus it is possible to further reduce the size and weight of the disk device. Become.

FIG. 54 is a diagram showing a fifth preferred example of the entire mechanism of the spindle motor in the disk device according to the present invention.

FIG. 54 also shows the main part of the spindle motor mechanism.

The construction of the fifth preferred embodiment is as follows:
It is similar to the configuration of the fourth preferred embodiment shown in FIG.

However, the fifth specific example is different from the fourth specific example in that the spindle hub 11 has a substantially annular shape and is formed in a plurality of portions in the axial direction of the spindle 25. It is divided.

The rotor magnet 26-8 is joined to the spindle hub 11 as an intermediate member.

Further, the rotor magnet 26-8 is magnetized in the same direction as the axial direction of the spindle 25.

Further, the rotor magnet 26-8 is
The upper magnetized surface and the lower magnetized surface are formed with a thickness as short as possible so as to face the cover 23 and the stator coil 26-4, respectively.

The fifth specific example of the overall mechanism of the spindle motor is similar to that of the spindle motor mechanism in the other specific examples, due to the novel arrangement of the rotor magnets. It is possible to obtain a remarkable characteristic that a smaller size and a lighter weight can be achieved than those in the above.

Further, the holding of the disk, which was difficult in the fourth embodiment, is facilitated by using a material which can be easily processed, and a good disk height accuracy is obtained.

FIG. 55 is a diagram showing a sixth preferred example of the entire mechanism of the spindle motor in the disk device according to the present invention.

FIG. 55 also shows a main part of the spindle motor mechanism, particularly a structure in which the magnetic disk is mounted on the spindle hub.

In this case, the spindle 25, the pair of bearing means 26-2, the rotor magnet 26-3, the stator coil 26-4, etc. are substantially the same as those in the first embodiment shown in FIG. Have a mutual relationship.

In the conventional structure in which the magnetic disk is mounted, at least one magnetic disk 24 is fixed to the spindle hub 11 by a lock clamp means arranged on the magnetic disk 24 by means of a screw or the like. .

On the other hand, in the sixth embodiment shown in FIG. 55, instead of using the clamp means and screws,
The magnetic disk 24 is engaged with the spindle hub 11 via an adhesive agent such as a photo-curable adhesive agent, and finally, the ultraviolet ray (UV) is irradiated to cure the adhesive agent. The spindle hub 11
It is to be fixed to.

In such a structure, the disk fixing structure is simpler than that of the conventional one, and the conventional clamp means and some components such as screws are unnecessary.

Therefore, the total number of the constituent members can be reduced, and the space in the housing 21 can also be reduced.

Therefore, the thickness of the housing 21 can be made smaller than that of the conventional one, and the size of the entire disk device can be made compact like a PCMCIA Type II IC memory card. .

FIG. 56 is a diagram showing an example of a modification of the disk fixing structure in the sixth specific example shown in FIG. 55.

Also in FIG. 55, only the main part of the spindle motor mechanism is shown.

The configuration of FIG. 56 is similar to that of the sixth preferred embodiment shown in FIG.

However, in addition to the above-described sixth specific example, in the above-mentioned configuration, the concave portion 47-1 having a triangular cross-section and having a shape such that the adhesive 47 can be stored in advance, The spindle hub 11 and the magnetic disk
It is provided on 24 individual adhesive surfaces that contact each other.

In such a case, when the magnetic disk 24 is bonded to the spindle hub 11 with an adhesive 47 such as a photocurable adhesive, the above-mentioned recessed portion 47-1 is formed.
Are arranged so that a sufficient amount of adhesive 47 is filled, so that the adhesive force between the two adhesive surfaces is
It will be increased more than that shown in Fig. 55.

In each of the disk fixing structures shown in FIGS. 55 and 56, the adhesive 47 is uniformly applied over the entire area of each bonding surface of the spindle hub 11 and the magnetic disk 24. It is also necessary that the adhesive 47 is uniformly cured by irradiation of ultraviolet rays (UV) so that the adhesive 47 is uniformly fixed over the entire area.

In this case, a photo-curable adhesive is preferably used as the adhesive 47.

As another specific example, an anaerobic adhesive can be used in a region that does not come into contact with air, and a photocurable property and an anaerobic property that can be cured by irradiation with ultraviolet (UV) light at the same time. It is also possible to use other adhesives provided.

Further, the shape of the recessed portion 47-1 can not be limited to the one having the triangular cross section already described with reference to FIG.

For example, the concave portion 47-1 may have a semicircular shape, a rectangular shape, or many other shapes.

Further, a plurality of concave portions each having the above-described various shapes are provided, and the concave portions are formed so as to be connected to each other so as to form a continuous groove shape as a whole. May be.

In this case, the concave portion is the spindle 25.
It is preferable that they are arranged so as to be dispersed at equal intervals in the peripheral direction.

As described above, in such a structure, the adhesive agent 47 can be uniformly applied to the respective adhesive surfaces of the spindle hub 11 and the magnetic disk 24, and the adhesive agent of the respective adhesive surface can be applied. By curing the, a uniform bond is achieved.

Furthermore, it becomes possible to disperse a plurality of recesses uniformly.

Therefore, when the spindle hub 11 to which the magnetic disk 24 is fixed rotates, the adhesive agent 47 is not uniform when fixing the respective adhesive surfaces to each other, or the concave portion is not uniform. It is possible to reduce a defect, which is a phenomenon of imbalance, such as vibration of the bearing means 26-2 due to non-uniform arrangement of the parts, to the minimum possible level. is there.

Further, in the first stage, when the spindle hub 11 rotates together with the magnetic disk 24 and the above-mentioned phenomenon of imbalance (unbalance) occurs, the spindle hub 11 is rotated. Such a rotating member is placed on the test mount of the device in order to measure the degree of imbalance in such a way that the oscillation of the spindle hub 11 is not restricted.

In the second step, the part of the adhesive surface at which the imbalance to be corrected exists is determined by evaluating the direction (phase angle) of the imbalance and the amount of imbalance. .

At the third stage, as typically shown in FIG. 57, the necessary amount of the correction weight member 11a made of a photo-curing resin, a thermosetting resin or the like is used as the magnetic disk. It is attached to the above-specified position on the adhesive surface other than the 24 recording areas.

In the fourth stage, the correction weight member 11a is cured by means of ultraviolet rays (UV), high temperature or the like.

In such a case, preferably, metal powder or the like is mixed with the resin in order to adjust the specific gravity amount of the modified weight member 11a.

Finally, the curable resin acting as a correcting means makes it possible to surely suppress the above imbalance phenomenon.

FIG. 58 is a diagram showing a modification of the frame shown in FIG. In FIG. 58, a part of the U-shaped frame 33 of FIG. 38 is shown by being highlighted by a one-dot chain line.

In the disk device configuration of the present invention, the connector 42 supports the disk device fairly firmly. However, there is inevitably a gap (play) between the frame that acts as an insertion guide portion for inserting the disk device into an external host computer and the housing 21 of the disk device.
Therefore, when the housing 21 is inserted into the slot of the host computer and then a severe seek operation (head movement) is performed by frequently reading or writing data in a plurality of tracks, the disk may react to the movement of the magnetic head. The device also moves violently. As a result, an abnormal noise may occur. In order to avoid such abnormal noise, it is necessary to minimize the play between the frame and the housing.

1 for substantially suppressing such play
As one measure, in FIG. 58, a protruding portion 33-1 slightly protruding from the straight line of the entire outer shape is formed on a part of the frame 33 (enlarged and indicated by a one-dot chain line).
Since the protrusion 33-1 is formed on only a part of the frame 33, it is possible to give the protrusion 33-1 a function equivalent to that of a spring. In this case, in order to prevent the frame 33 from being caught at the slot entrance when the housing 21 is inserted, the position of the protruding portion 33-1 needs to be as outer as possible (opposite side of insertion), and the frame 33 needs to be as soft as possible with respect to the slot. . In order to make the frame 33 softer, a slit 33-2 may be formed inside the protrusion as shown in FIG. Also,
As shown in FIG. 60, if the elastic means 33-3 such as a thin metal leaf spring is insert-molded on the frame 33 made of this resin member, the above play is completely absorbed. This elastic means
33-3 is preferably inserted in the in-plane direction from the viewpoint of the function, but since frictional force actually works, the same effect can be obtained even if it is inserted in the up-down direction.

61 to 67 are diagrams showing an example of the lock structure of the head mechanism portion in the disk device according to the present invention. More specifically, FIG. 61 is a plan view schematically showing the lock structure of the head mechanism portion of the present invention, and FIG. 62 is a partial enlarged view for explaining the seal structure between the inside of the housing and the rod disposition region. A sectional view, FIG. 63 is a perspective view for explaining the inserting / removing operation of the disk device of the present invention with respect to a personal computer, and FIG. 64 is a plan view showing in detail the second locking structure of the head mechanism portion of the present invention, FIG. 65 is a front view showing a second lock structure of the head mechanism portion of the invention in a partial cross section, and FIGS. 66 (A), (B) and (C) are components directly related to the lock of the actuator. A plan view of
A front view and a side view, and FIGS. 67 (A) and 67 (B) are a plan view and a front view showing details of the structure of the rod in a partial cross section.

Also in FIGS. 61 to 62, as in the case described above, one magnetic disk 24 mounted on the spindle fixing shaft 12 in the housing 21 and this magnetic disk
A magnetic head 27 for recording / reproducing information corresponding to 24
A supporting spring (not shown) and an actuator 29 for positioning a head supported via an arm 28 are arranged.

In the vicinity of the outer circumference of the magnetic disk 24, a loading / unloading member 54 for loading or unloading the magnetic head 27 with respect to the magnetic disk 24 and the magnetic head 27 in the unloading state. A stopper 53 for fixing the actuator 29 is arranged near the outside of the arm 28 at the time. Further, on the side portion along the magnetic disk 24 and the actuator 29, a rod 52 having a coil spring 51 attached to one end and acting as a drive bar is arranged movably in the length direction thereof as shown by an arrow. It is set up. In this case, the loading / unloading operation is performed by using the housing 21 of the disk device as an external host device.
When the operation of inserting / removing into / from the slot 60-1 of 60 (FIG. 61) is performed, it is performed in conjunction with this inserting / removing operation.

Also, the rod 52 with the coil spring 51 described above.
Includes a first lock lever 52a provided with a pad 56 that functions as a packing for a rubber material for fixing the disk so as to interlock with the movement in the length direction, and a second lock lever 52a for pressing the arm 28 against the stopper 53. Lever 52b and support shaft
57-1 and 57-2, respectively, and
The two protruding pins 55 are arranged so as to be engaged with each other. Specifically, the rod 52 is installed inside the frame 33 (see FIGS. 58 to 60) attached to the outer peripheral portion of the housing 21, and the tip of the rod is located at a position next to the connector terminal 22-1. It is configured to project.

Furthermore, on the outer surface of the housing 21,
An operation hole 58 for pressing the other end of the rod 52 to operate it, and a connector terminal 22-1 to which data and control signals are transferred and a power is supplied are provided. The disk device 20 configured as described above includes the connector terminal 60-2 corresponding to the connector terminal 22-1 and the rod terminal 60-2.
It can be inserted into and removed from a slot 60-1 of a host computer 49 (FIG. 63) or the like having an inner end surface provided with an operating projection 59 for pressing the other end of 52 to operate.

As shown in the partial enlarged sectional view of FIG. 62, the inside of the housing 21 and the disposition region of the rod 52 are provided with an O-ring 57a on a support shaft 57-2 which supports the second lock lever 52a. It is sealed by interposing. As a result, outside air is shut off in the housing 21 in an airtight manner.

Then, as shown in FIG. 63, when the disk device 20 is inserted into the slot 61 of the personal computer 49, as shown in FIG.
The -1 side connector terminal 60-2 and the disk device 20 side connector terminal 22-1 are connected. Plus, slot 60
The rod on the disk device 20 side by the -1 side operating protrusion 59
The other end of 52 is pressed, and in conjunction with this pressing operation, the first lock lever 26 having the pad 56 that presses and fixes the disk 24 and the arm 28 are pressed against the stopper 53 to fix the actuator 29. The second lock lever 52L that is operating is released. This allows the disc 24 to rotate,
Further, the magnetic head 27 in the unloaded state is loaded onto the disk on the load / unload member 54 and becomes operable.

Further, the disk device 20 is installed in the slot 60-
When the rod 52 is taken out from inside 1, the rod 52 moves in the direction of the operation hole 58 due to the bias of the coil spring 51, and the first lock lever 52a and the second lock lever 52b provided with the pad 56 are interlocked with this. It is rotated. As a result, the first lock lever
The pad 56 provided on 52a stops the rotation of the magnetic disk 24 and enters a locked state, and the head arm 28 supporting the magnetic head 27 is pressed against the stopper 53 by the second lock lever 52b, so that the magnetic head 27 moves. The actuator 29 is locked at the same time when the load / unload member 54 is unloaded.

As a mechanism for putting the magnetic disk 24 and the actuator 29 in the locked state and the unlocked state, for example, as shown in FIG. 63, a card type magnetic disk device 20 is installed in the slot 60-1 of the host computer 49.
When the lid 49a of the host computer 49 is closed with the disk inserted, the protruding pin 49b is pressed and the disk device 20
It is also possible to operate the rod 52 on the side to lock the magnetic disk 24 and the actuator 29, and when the lid 49a is opened, the pressing state of the projecting pin 49b is released and the locked state is released. it can.

In this case, the host computer
An opening / closing lid that opens / closes in conjunction with the inserting / removing operation of the disk device 20 may be provided at the opening of the slot 60-1 of 49. In the above lock mechanism, the inside of the disk device is sealed from the outside air so that it can be inserted into or removed from the host computer or other equipment, and the magnetic head can be loaded / unloaded in conjunction with the insertion / ejection operation. Since it is possible to lock / unlock the magnetic disk and actuator, accidental shock during handling or carrying can be protected, and a safe and reliable IC memory card type disk device can be realized. Have advantages.

Now, a second embodiment of the lock mechanism of the magnetic head 27 will be described.

In FIGS. 64 and 65, 51-1 indicates a leaf spring, and 51-2 indicates an operating lever. Again 51
-4 indicates a pin. When the housing 21 of the disk device 20 is inserted into the host computer 49 etc., the rod 52 (first
(Fig. 61), for example, the push lever 51-3 is pressed and the actuating lever 51-2 moves, so that the actuator 29 becomes movable. For this reason, the magnetic head 27 is loaded and the memory can be accessed. On the other hand, when the housing 21 is removed from the host computer,
The restoring force of the leaf spring 51-1 causes the actuator 29 to return to its original position and the magnetic head 27 to be unloaded.

In this card-type magnetic disk device 20, dropping when carried alone is the most severe condition for device failure. Therefore, in response to this most severe condition of falling, as described above, the housing
It uses a mechanism that locks when 21 is pulled out of the slot. That is, a straight rod 52 supported by a spring such as a leaf spring is arranged beside the connector, and when the housing 21 is pulled out from the slot 60-1, the rod 52 is restored by the restoring force of the leaf spring or the like.
52 is translationally displaced to the outside, and at this time, it is configured to be locked by the spring preload. This preload is a preload moment that does not lose the torque due to the inertia moment of the actuator 29 against the assumed rotational angular acceleration at the time of dropping. Specifically, one corner of the long side of the card is fixed and 1000 G acceleration is applied to the opposite corner (122000 rad / s ^{2 of} angular acceleration conversion).
It is designed so that the Actuator 29 does not move even if it is hit.

The rod 52 extends along the frame 33 from the portion of the connector 42 to the side portion of the actuator 29. One end of the rod sticks out in the groove for preventing incorrect insertion that is defined by the PCMCIA standard on the side of the connector, and the end of the rod is pushed by being inserted into the slot of the PCMCIA standard. It is supposed to be. This rod 52 is provided with a partially arcuate undercut semicircular hole (see LL sectional view of FIG. 67 (B)) in a resin mold part such as the frame 33. Holes composed of the peripheral part (KK of FIG. 67 (B))
(See cross-sectional view) and.

[0288] Then, there is a partially scribed hole in the lateral part of the cover, and here is an operating lever extending from the actuator 29 side.
51-2 is in contact with the rod 52. This operating lever
51-2 is a leaf spring 51-1 behind the magnetic circuit described later.
Is pressed against the connector 42 side. This rod
The 52 has its center of rotation on the side of the magnetic circuit, and has a sickle-like tip at its tip, and is designed to press and lock the actuator 29. When the rod 52 is in the released state, due to the preload of the leaf spring 51-1 shown in detail in FIG. 66,
The magnetic head 27 is pressed so that it is fixed on the outer side. On the other hand, when the housing 21 is inserted into the slot 60-1, the rod 52 is pushed rearward and the operating lever 51-2 is oriented in the unlocking direction. By the way, the load against the spring at the time of this insertion is about 100 g, which is within the range where there is almost no obstacle in view of the connector insertion load and the holding load. In the case of the thin structure as in the present invention, the operating lever 51-2 is extremely close (on the order of 0.1 mm) to the rotating portion of the actuator 29, and there is a risk of contact. In order to avoid this danger, the tip of the shaft of the rod 52 is preloaded so as to be pressed against the base 22 or the cover 23. In this way, the risk of contact as described above can be avoided regardless of the dimensional tolerance.

FIG. 68 is a cross-sectional front view of the first preferred embodiment of the spindle motor structure capable of reversely fixing the disk in the disk device according to the present invention.
In FIG. 68, only the main parts of the components are shown so that the feature of mounting the disk on the stator coil side can be seen well.

Here, in order to clarify the difference from FIG. 68, referring again to the above-mentioned FIG. 42, the structure for attaching the disk 24 to the surface of the hub 11 opposite to the stator coil 26-4 is described. It will be explained in detail.

When fixing the disk 24 in FIG. 42, first, the disk 24 is mounted on the flange portion of the outer peripheral portion of the hub 11. In this case, since the hub 11 is provided with the step portion 11 ′ in advance, the recess is formed by mounting the disk 24. Next, an adhesive 19 'such as an anaerobic adhesive is accommodated in this recess, and the adhesive 19' and the disk 24 are
Adhesive ring 19 is mounted on disk 24 so that it contacts both of the upper surfaces of. When the adhesive 19 'is cured in this state, the disk 24 is firmly fixed to the spindle hub 11.

Here, the reason why the adhesive ring 19 is purposely used will be described.

The first reason is that even if the adhesive 19 'is accidentally attached to the surface of the disk 24, there is a risk of damage to the disk surface for reproduction / recording. It is difficult to hold down.

The second reason is that the adhesive ring 19 makes it possible to prevent the adhesive 19 'from flowing out to the outer peripheral portion of the disk 24 where the magnetic head 29 exists.

Thirdly, when the adhesive 19 'is an anaerobic adhesive, even if the adhesive 19' flows out on the disc surface, the portion other than the adhesive ring 19 is adhered to the disc surface. Since the agent 19 'does not cure because it is exposed to the outside air, it does not affect the movement of the magnetic head 27.

As a fourth reason, the inner diameter of the disk and the spindle hub 11, and the upper surface of the disk, the bonding ring 19 and the spindle hub 11 are separately bonded without bonding the disk 24 and the flange portion of the spindle hub 11. This is because the disc mounting height can be controlled with high accuracy.

The adhesive fixing using the adhesive ring 19 is different from the pressing fixing using the conventional clamp member in that the preload cannot be applied in the pressing direction. That is, in the ordinary press-fixing, the member can be pressed in the pressing direction of the disk 24 by a member having a spring property (including a screw), but in the adhesive fixing using the adhesive as in the present invention, the adhesive creeps. Therefore, it is difficult to apply preload. For this reason, it is important to properly control the thickness of the adhesive when it is cured.

As described above, in contrast to the method of adhesively fixing the disk 24 to the surface of the spindle hub 11 on the side opposite to the stator coil 26-4, in FIG. 68, the surface facing the stator coil 26-4 of the spindle hub 11 is arranged. The method in which the disk 24 is fixed is adopted.

In FIG. 68, the spindle hub 11 has a flange portion 62 on the side opposite to the stator coil 26-4 side, and the support surface 62a faces the stator coil 26-4 side. Further, the spindle hub 11 has a stator coil 26-4.
A clamp margin 63a to which the clamper 63 is fitted is provided on the side.

The flange portion 62 has a sufficient thickness t ₂ so that the flange portion 62 does not warp or the like during cutting.

The magnetic disk 24 is a supporting surface of the flange portion 62.
It is supported by 62a, clamped by a clamper 63 press-fitted from the side of the stator coil 26-4, and fixed to the spindle hub 11. The flange portion 62 has sufficient rigidity, and the support surface 62a is formed with high dimensional accuracy. Therefore, the magnetic disk 24 is accurately fixed, and recording / recording is performed.
Regeneration is good.

The clamper 63 merely presses the magnetic disk 24 and can be made relatively thin. The clamper 63 is aligned with the lower surface 11d of the spindle hub 11.

With the above structure, the upper surface of the base 22
The height dimension H ₁₀ from 22i to the magnetic disk 24 can be made smaller than in the case of FIG. 42 described above.

The flange portion 62 is located at a position corresponding to the arm supporting portion 17 such as a carriage in the height direction, and the thickness dimension t ₂ of the flange portion 62 is the height of the upper half of the arm supporting portion 17. It is contained within the dimension H ₃ . Therefore, the base
The height dimension H ₁₁ between the cover 21 and the cover 23 corresponds to the sum (H ₁₀ + H ₃ ) of the above-mentioned height dimension H ₁₀ and the height dimension H _3, and the dimension of this sum is 42nd. It can be made smaller than in the case of the figure. The magnetic disk device 20 of FIG. 68 is expected to be thinner than that of the case of FIG.

Further, in this case, since the disk 24 is arranged substantially at the center of the housing 21 in the thickness direction,
The balance when the 24 rotates is fully guaranteed.

FIG. 69 is a sectional front view of a second preferred embodiment of the spindle motor structure capable of fixing the disk in the disk apparatus according to the present invention in reverse.

The present embodiment has a structure in which the clamper 63 in FIG. 68 is omitted and the thickness is further reduced. Figure 69, number
The parts corresponding to the parts shown in FIG. 68 are designated by the same reference numerals. Here, the spindle hub 11 has substantially the same structure as the spindle hub 11 of FIG. 68 except that the clamp margin 63a in FIG. 68 is eliminated. 62a is provided. The magnetic disk 24 is fitted with the spindle hub 11, abutted on the support surface 62a and positioned, and is bonded with the adhesive 61 to be fixed accurately.

As a result, the height dimension H ₂₀ from the upper surface 22i of the base 22 to the magnetic disk 24 becomes smaller than the corresponding height dimension H ₁₀ in FIG. 68 by the height dimension of the clamp margin 63a. That is, the height dimension H ₂₁ between the base 22 and the cover 23 corresponds to the sum (H ₂₀ + H ₃ ) of the height dimension H ₂₀ and the height dimension H _3, and the dimension of this sum. Is smaller than the height dimension H ₁₁ in FIG. As a result, the magnetic disk device shown in FIG. 69 becomes thinner than the magnetic disk device shown in FIG. 68.

FIG. 70 is a perspective view showing a first preferred embodiment of the actuator structure in the disk device according to the present invention.

In the figure, the arm 28 is, as described above,
It has an arm tip portion 28-1 for holding the magnetic head 27 at its tip portion, and is arranged rotatably in the direction of arrow B about the second fixed shaft 45, and its rear end. A flat coil 67 is fixed to the section. A pair of permanent magnets 29-5 and 29-6 are provided near the flat coil 67.
Are placed. Further, the edge portion on the side of the arm 28 in the width direction has a curved shape, and the central portion of the edge portion opposite to the edge portion is, for example, in consideration of space utilization efficiency in the magnetic disk device. A lower yoke 29-2 is provided which is formed in a wide width so as to project in a corner shape so as to be arranged by utilizing a corner portion in the device. On the other hand, a curved upper yoke 29-1 having a generally used width (for example, a width narrower than the lower yoke 29-2) is provided. These upper and lower yokes 29-1,
29-2 has side yokes 29 on both sides with a predetermined interval.
-3 and 29-4 are magnetically connected. The pair of permanent magnets 29-5 and 29-6 and the upper yoke 29-1 in the magnetic circuit 65 formed by these yokes and the like.
The flat coil 67 is movably combined in the space between the two to form a drive coil motor (DCM).

As described above, the actuator 29 according to the present embodiment.
Then, in the magnetic circuit 67, a shape is formed in which the width of the central portion of the lower yoke 29-2 in which the magnetic flux directly passes from one permanent magnet 29-5 to the other adjacent permanent magnet 29-6 to increase the magnetic flux density is wide. By increasing the cross-sectional area by increasing the area of the lower yoke 29-2, the magnetic flux saturation is eliminated even if the lower yoke 29-2 and the upper yoke 29-1 are thinned, and the magnetic flux caused by the magnetic flux saturation is eliminated. A decrease in the gap magnetic flux density due to leakage is suppressed.

Further, due to the shape of the lower yoke 29-2, the actuator 29 can be installed in a corner in the magnetic disk device with space efficiency, and it is not necessary to increase the size of the entire device.

71, 72 and 73 are views showing a second preferred embodiment of the actuator structure in the disk device according to the present invention. More specifically, FIG. 71 is a perspective view showing the main part of this embodiment, and FIGS. 72 (A) and 72 (B).
Is a plan view and a front view, and FIG. 73 is a perspective view showing a head mechanism section and a magnetic circuit separately.

The embodiment shown in these figures is different from the embodiment shown in FIG. 70 in that another magnetic circuit 66 constituting a drive coil motor in combination with a flat coil 67 fixed to the rear end of the arm 28 is provided. The shape of the upper yoke 29-1 in
Similar to the shape of the lower yoke 29-2, the central portion of the lower yoke 29-2 is formed to have a wide width by projecting into a corner shape.

With the structure of this embodiment as well, the lower yoke 29-2 has the same concept as that of the embodiment shown in FIG.
The upper yoke 29-1 and the upper yoke 29-1 are formed such that the central portion of the upper yoke 29-1 has a wide width.
Since the cross-sectional area is increased by increasing the area of the magnetic flux, magnetic flux saturation can be more effectively eliminated even if the lower yoke 29-2 and the upper yoke 29-1 are thinned. As a result, the decrease in the magnetic flux density in the air gap caused by the magnetic flux leakage due to the magnetic flux saturation is suppressed.

First and Second Actuator Structures
In any of the above embodiments, even if the lower yoke and the upper yoke forming the magnetic circuit are thinned, the saturation of the magnetic flux in the lower yoke and the upper yoke is effectively eliminated, and the magnetic flux caused by the magnetic flux saturation is eliminated. A decrease in the gap magnetic flux density due to leakage is suppressed. In addition, as in the first embodiment,
When the wide portion is provided on either the upper or lower yoke, if the magnet is bonded to one of the yokes, the wide portion should be provided on the yoke having the magnet. Generally, in case of one side magnet configuration,
In the gap, the magnetic flux in the vicinity of the yoke on the side without the magnet tends to spread, so that the magnetic flux density in the central portion of the yoke is slightly low. In this case, if the yoke is made wider than necessary, the spread of the magnetic flux may be promoted, and the magnetic flux interlinking with the coil may be lowered rather.

Further, the width of the lower yoke, or the central portion of the lower yoke and the upper yoke is made wide so as to be projected in a corner shape so as to be arranged by utilizing the corner portion in the magnetic disk device. The efficiency of space utilization in the device is improved. As a result, miniaturization of the actuator and miniaturization and thinning of the magnetic disk device are promoted.

FIGS. 74 and 75 are views showing a third preferred embodiment of the actuator structure in the disk device according to the present invention. More specifically, FIG. 74 is a perspective view of the yoke portion according to the present invention. FIG. 74 (A) shows the yoke portion in a disassembled state, and FIG. 74 (B) shows the yoke portion. The assembled state is shown. Further, FIG. 75 is a view showing details of the head mechanism section including the moving coil type actuator, and FIG. 75 (A) is a front view showing a section,
FIG. 75 (B) is a plan view thereof.

In FIG. 74 (A), the yoke portion 68 is
It is composed of an upper member 68-1 and a lower member 68-2. Upper member
Each of the 68-1 and the lower member 68-2 is formed by bending a plate material made of a soft magnetic material having a high saturation magnetic flux density by pressing.

The upper member 68-1 has a substantially fan-shaped upper surface 68.
a, two upper side surface portions 68b, 68c formed by being bent downward at right angles at both end portions of the upper surface portion 68a,
And an upper end surface portion 68d formed by being bent at a right angle from the central portion of the outer circumferential side edge of the upper surface portion 68a. On the other hand, the lower member 68-2 includes a substantially fan-shaped lower surface portion 68e, two lower side surface portions 68f and 68g formed by being bent at right angles upward at both end portions of the lower surface portion 68e, and a lower surface portion. It has a projecting edge portion 68h provided so as to project at the center of the outer circumferential side edge of 68e. In addition, the upper side surface portions 68b, 68
The lengths of c, the lower side surface portions 68f and 68g, and the upper end surface portion 68d are all the same. However, all of them may not be the same, and for example, the lengths of the upper side surface portions 68b and 68c may be short enough not to protrude below the lower surface portion 68e.

As shown in FIG. 74 (B), the upper member 68
-1 and the lower member 68-2 include an upper side surface portion 68b and a lower side surface portion 68f.
In a state where the upper side surface portion 68c and the lower side surface portion 68g are in close contact with each other and overlap each other, the respective tip edges of the lower side surface portions 68f and 68g contact the upper surface portion 68a, and the tip edge of the upper end surface portion 68d projects. It is arranged in contact with the edge portion 68h.

The upper side surface portions 68b, 68c and the lower side surface portion 68
Since f and 68g are not parallel to each other, the upper side surface portion 68
b, 68c and lower side surface portions 68f, 68g overlap each other, so that the horizontal direction (direction parallel to the upper surface portion 68a)
Are positioned, and the lower side surface portions 68f and 68g and the upper surface portion 68a are
The vertical contact (height direction) is performed by abutting. The upper end surface portion 68d and the projecting end edge portion 68h are in contact with each other, so that both postures are supported in a stable manner. In the thus positioned state, the upper surface portion 68a of the upper member 68-1 and the lower surface portion 68e of the lower member 68-2 face each other, and the upper side surface portion 68b, the lower side surface portion 68f, and the upper side surface portion 68 are disposed.
c and the lower side surface portion 68g, the upper member 68-1 and the lower member
Magnetic paths MPa and MPb are formed between the magnetic poles 68-2 and 68-2, whereby an annular magnetic path MP is formed in the entire yoke portion 68.

Therefore, the magnetic path MPa or MPb which is conventionally formed by the pillar member which is a separate component.
Is formed by the upper side surface portions 68b, 68c and the lower side surface portions 68f, 68g, and the number of parts is reduced. Further, since there is only one connecting portion in each of the magnetic paths MPa and MPb and the facing area of each connecting portion is large, the magnetic resistance in the connecting portion is suppressed to be small and the magnetic resistance of the entire yoke portion 68 is reduced. In addition, it is possible to reduce the leakage magnetic flux in the connection portion, and it is possible to obtain a high magnetic flux density in the movable portion.

The magnetic paths MPa and MPb are the upper side surface portion 68.
Since the b and 68c and the lower side surface portions 68f and 68g are formed by being overlapped with each other, the magnetic flux density is lower than that of the upper surface portion 68a and the lower surface portion 68e, and saturation is less likely to occur in those portions. There is. Therefore, for example, the yoke part
When a housing for housing the 68 is made of a magnetic material and a part of the housing is arranged to be in contact with the upper surface portion 68a or the lower surface portion 68e, that portion of the housing serves as the magnetic path MP of the yoke 68. Although it becomes a part and the total magnetic flux increases, the magnetic flux can pass through the magnetic paths MPa and MPb without being saturated, and the magnetic flux density of the movable part can be increased. further,
The upper member 68-1 and the lower member 68-2 include an upper side surface portion 68b,
Overlapping of 68c and lower side surface portions 68f, 68g and lower side surface portion 68f,
Since the positioning is easily performed by the contact between 68g and the upper surface portion 68a, it is not necessary to purposely provide an extra positioning portion such as a dowel as in the conventional case. Therefore, it is extremely easy to process and assemble the parts. Further, the contact between the upper end surface portion 68d and the projecting end edge portion 68h makes it possible to stabilize the posture of both and reduce the magnetic resistance. In order to integrate the upper member 68-1 and the lower member 68-2, an adhesive may be applied to the contact surfaces of the upper side surfaces 68b, 68c and the lower side surfaces 68f, 68g, or The housing for housing the yoke portion 68 may be integrated.

Further, as shown in FIGS. 75 (A) and (B), the head mechanism portion includes an actuator 29, an arm 28 connected to the actuator 29 to move, and an arm connected to this arm 28. Tip 28-1, this arm tip 28-
The magnetic head 27 is attached to the tip of the magnetic head 27.

The actuator 29 is a magnet portion 29 formed of a pair of permanent magnets attached to the inner surfaces of the yoke portion 68, the upper surface portion 68a and the lower surface portion 68e of the yoke portion 68, and facing each other.
a, a flat movable coil portion 29b movably arranged between the magnet portion 29a, a movable coil portion 29b and an arm 28
An arm support 17 such as a carriage that rotatably supports the fixed shaft 45. The magnet portion 29a is composed of two permanent magnets each having a different polarity, and the coil 29b
The opposite currents flowing in the opposite sides receive electromagnetic force in the same direction by the magnetic fields in opposite directions, and rotate the arm support portion 17.

Further, the arm supporting portion 17 which is rotationally driven in this manner has lower side surface portions 68f, 68 at its rotating end.
It abuts against the inner side edges 29d and 29e of g, and the drive range of the actuator 29 is restricted thereby. That is, the side edges 29d and 29e also serve as stoppers, and the structure of the actuator 29 is simplified. In the actuator 29, since the magnetic resistance of the yoke portion 68 is low and the saturation magnetic flux density is high, the magnetic flux density between the opposing permanent magnets (the magnetic flux density of the movable portion) is high, and a large force acts on the coil 29b.
Therefore, even a small-sized actuator 29 can generate a large torque, and can be suitably used as an actuator for a small-sized thin magnetic disk device such as a card-type magnetic disk device.

In the above embodiment, the upper side surface portion
68b, 68c outside of the lower side surface 68f, 68g,
Positioning in the vertical direction (height direction) is performed by the tip edges of the lower side surface portions 68f, 68g, but the upper side surface portions 68b, 68c.
The positional relationship between the lower side surface portions 68f and 68g may be reversed. Further, the cover 22 can be made of a magnetic material and can be a part of the magnetic circuit formed by the actuator 29.

FIG. 76 is an exploded perspective view of the yoke 168a of the fourth preferred embodiment of the actuator structure according to the present invention. In FIG. 76, portions having the same functions as the portions described in FIG. 74 above are designated by the same reference numerals, and description thereof will be omitted or simplified.

In the yoke portion 168 of FIG. 76, the width dimensions of the upper side surface portions 168b, 168c and the lower side surface portions 168f, 168g are approximately half the lengths of the edges of the upper surface portion 68a and the lower surface portion 68e. It is set.

As a result, the shape of the yoke portion 168 is reduced, the occupied volume is reduced, and other mechanical parts or the like are arranged in the reduced width portions of the upper side surface portions 168b, 168c and the lower side surface portions 168f, 168g. Therefore, the magnetic disk device can be further miniaturized. In this case, although the width dimensions of the upper side surface portions 168b, 168c and the lower side surface portions 168f, 168g are reduced, their thickness is twice as large as that of the upper surface portion 68a and the lower surface portion 68e. Unless used together as a magnetic path, the upper side parts 168b, 168c and the lower side part 16
Only the 8f and 168g parts are not magnetically saturated.

FIG. 77 shows the lower member 69 of the yoke portions 69a to 69c of yet another embodiment of the actuator structure according to the present invention.
-2a, 69-2c is a perspective view showing only. In FIG. 77, portions having the same functions as the portions described in FIG. 74 above are designated by the same reference numerals, and description thereof will be omitted or simplified.

The lower member 69-2a of the yoke portion 69a shown in FIG. 77 (A) has lower side surface portions 68f, 68g and a lower surface portion 68.
A lower end surface portion 68k is formed continuously with e. Bottom surface
The 68k becomes a part of the magnetic path and supports the upper member to stabilize its posture.

The lower member 69-2b of the yoke portion 69b shown in FIG. 77 (B) includes two lower end surface portions 68l from the lower surface portion 68e,
68m is formed. The lower end surfaces 68l, 68m also become a part of the magnetic path and support the upper member.

In the lower member 69-2c of the yoke portion 69c shown in FIG. 77 (C), a lower end surface portion 68n for a stopper is formed from the lower surface portion 68e to the inside of the lower side surface portion 68f. The lower end surface portion 68n is an actuator instead of the side edge 29d described above.
It regulates the drive range of 29 and becomes a part of the magnetic path.

The upper members of the yoke portions 69a to 69c are
The lower members 69-2a to 69-2c are symmetrical with each other and are fitted into each other to form lower side surface portions 68f, 68g and lower end surface portions 68k, 68.
1, 68m, 68n overlapping shape, or simply the upper surface portion 68
Various shapes such as a shape composed of a and the upper side surface portions 68b and 68c can be selected.

In the above-described embodiment, either the upper member 68-1 or the lower member 68-2 may be on the upper side or the lower side.
The upper member 68-1 and the lower member 68-2 can be manufactured by various forming methods other than pressing. Magnet part
Only one permanent magnet 29a may be used.

According to the present invention, it is possible to form a yoke with a small number of parts, reduce the magnetic resistance, and obtain a high magnetic flux density in the movable portion. Further, the upper member and the lower member can be easily positioned with respect to each other to facilitate the assembly.

FIGS. 78, 79, 80 and 81 show an improved example of the first preferred embodiment of the overall construction of a spindle motor as in FIG. More specifically, FIG. 78 is a sectional view of an axial flux type spindle motor according to the improved example described above. In addition, 75 represented by satin shows a magnetic path assisting means,
In this embodiment, it is formed integrally with the rotor yoke 76.

79 to 81 show a detailed structure of an axial flux type spindle motor according to the present invention,
FIG. 79 is a perspective view of one structural block, FIG. 80 is a IV-IV sectional view of one structural block in FIG. 79, and FIG. 81 is a VV sectional view of one structural block in FIG. 79. Are shown respectively. In addition, reference numeral 75 shown in satin indicates a magnetic path assisting means, which is formed integrally with the rotor yoke 76 in this embodiment.

In FIG. 79, an annular magnetic path assisting means 75 made of a magnetic material is arranged at a position near the magnet 26-3 and the stator coil 26-4 where the leakage magnetic flux can be captured. That is. That is, the annular magnetic path assisting means 75 is composed of the magnets 26 arranged in an annular shape.
-3 and the stator coil 26-4 are integrally formed with the rotor yoke 76. The distance between the magnetic path assisting means 75 and the stator yoke 77 is set to the magnet 26
-3 and the stator yoke 77 are narrower than the distance between them. Therefore, while the spindle motor 26 is rotating, a closed magnetic circuit in the circumferential direction shown by the broken line with an arrow in FIG. 80 is formed, and further, in FIG. 81, the magnetic path assisting means 75 has a property as a magnetic material. The leakage magnetic flux is trapped by the magnetic flux, and an auxiliary magnetic path closed in the radial direction via the magnetic path assisting means 75 is formed. That is, when there is no magnetic path assisting means, the magnetic flux passing only through the closed magnetic path in the circumferential direction becomes dispersed in the auxiliary closed magnetic path in the radial direction, so the magnetic flux density in the rotor yoke 76 and the stator yoke 77 is reduced, The leakage flux density due to the yoke saturation of the rotor yoke 76 and the stator yoke 77 is also reduced. The gap magnetic flux density for rotating the rotor yoke 76 increases as compared with the case without the magnetic path assisting means.

Therefore, even if the rotor yoke 76 and the stator yoke 77 are machined thinner than before, the stator coil
It becomes possible to efficiently convert the current flowing through 26-4 into torque. At the same time, it is possible to reduce the influence of the leakage magnetic flux density on a portion handling a recording signal such as a head or a recording disk.

FIG. 82 is a sectional view of another improved example of the first preferred embodiment of the overall structure of the spindle motor as shown in FIG. In the figure, those parts that are the same as those corresponding parts in FIG. 78 are designated by the same reference numerals, and a description thereof will be omitted. In this embodiment, the magnetic path assisting means 75 is formed integrally with the stator yoke 77, and even with this configuration, it is possible to obtain the same effects as in the example of FIGS. 78 to 81.

In addition to the above, although not shown, the magnetic path assisting means 75 is divided and formed integrally with the rotor yoke 76 and the stator yoke 77, and the magnetic path assisting means 75 is divided.
The same effect can be obtained also by making them face each other.

Further, in FIG. 78 and FIG. 82, the magnet 26-comprising a plurality of magnet elements arranged in an annular shape is used.
Although the magnetic path assisting means 75 is arranged so as to enclose the stator 26-4 composed of three and a plurality of coil elements from its inner circumference and outer circumference, the magnetic path assisting means 75 is arranged only on either the inner circumference or the outer circumference. Even if it is provided, the leakage magnetic flux density can be reduced as compared with the conventional one.

According to the improved example shown in FIGS. 78 to 82, the magnetic flux assisting means is provided to reduce the leakage magnetic flux density due to the saturation of the yokes of the rotor yoke and the stator yoke. Since it can be converted to torque effectively and the influence of the leakage magnetic flux density on the portion that handles the recording signal such as the head and the recording disk can be reduced, it is easy to provide a spindle motor that is smaller and thinner than before. It has the feature of being able to

FIGS. 83 and 84 are views showing a preferred embodiment of the retracting mechanism of the magnetic head in the disk device according to the present invention. More specifically, FIG. 83 is a plan view showing the head retracting mechanism in a highlighted manner, and FIG. 84 is a side view schematically showing the head retracting mechanism.

A magnetic disk device or an IC memory card used in a personal computer or the like is required to have high durability against not only the above-mentioned shock but also an external magnetic field. IC cards and the like are required to have no data anomalies even with a strong magnetic field of 1 KGauss, and a device having a general aluminum base / cover cannot withstand this. Generally, in a magnetic disk device, it is necessary to keep the head and the medium portion (disk) to 5 gausses or less.

Therefore, in the present invention, as described above, the magnetic shield is completely performed as the steel plate base / cover. Even a steel plate with a thickness of about 0.4 mm can provide a sufficient shielding effect for the above specifications. However, the problem is that the steel sheet that has been subjected to press working or the like may have a residual magnetization of about several tens of gausses. Therefore, it is possible to deal with these by performing magnetic annealing as necessary.

In order to minimize the influence of this external magnetic field, it is important that the magnetic head retracts to the data zone when the power is off. Because the magnetic head has a large effect of concentrating the magnetic flux, the magnetic field of the order of 10 Gauss affects the data directly under the head, and even in the case of 100 Gauss, there is a possibility of erasing the data. This is because the disk medium alone cannot erase even 1000 Gauss. Considering that the influence of the disturbance magnetic field is particularly great when carrying a portable disk,
A mechanical retraction mechanism that does not rely on VCM (Voice Coil Motor) drive is essential.

Particularly, in a magnetic disk drive having a floating magnetic head, a head for retracting the head to the parking zone when the disk is stopped in order to avoid damage to the data zone during CSS (Contact Start Stop) operation. The retracting mechanism and the actuator lock mechanism for holding the retracted head are essential. On the other hand, CSS
Even in an apparatus using a negative pressure slider (zero-load slider) that does not operate, the retracting / locking operation is necessary considering that the head collides with the medium when an external impact is applied. Further, in an apparatus having an unload mechanism, it is necessary to have a mechanism for surely moving the head to the unload position and holding it at that position when the power is turned off.

The following is a typical head retracting mechanism. That is, there are (1) one that uses a return spring, (2) one that retracts the actuator by using the back electromotive force of the spindle motor, and (3) one that utilizes gravity. Further, examples of the actuator lock mechanism include the following. That is, there are (1) one using a larouette mechanism, (2) one utilizing a frictional force, and (3) one utilizing a magnetic force.

However, in the return spring of the normal head retracting mechanism (1), as long as the linear spring is used, the offset force changes depending on the position of the data zone, so that it greatly affects the control system and is opposite to that of the retracting zone. At the position of, an excessive offset force was applied, which was a factor of increasing power consumption. Further, in the case of the retracting mechanism (2) as well, due to the downsizing of the device, the induced power of the spindle motor is reduced, and a problem arises in that a sufficient retracting force cannot be exerted. Furthermore, the gravity utilization of (3) is not applicable to the current mainstream balanced rotary actuators, and
Recent small devices cannot be used because the installation direction cannot be limited.

Further, in the actuator lock mechanism,
In the case of (1), a solenoid for releasing or holding is required, and in the case of (2), the setting is delicate, and so on. Further, the method utilizing the magnetic force of (3) is also a catch by a so-called magnet, and its effective range is limited to the immediate vicinity of the parking zone. The retracting mechanism using the return spring also has a locking capability, but its locking force is weaker than the retracting force unless a magnetic spring is used, and is not practical.

Therefore, in the present invention, the retracting mechanism using magnets shown in FIGS. 83 to 84 is used. Here, the head mechanism portion has a rotary actuator 29 (see, for example, FIG. 70), and the magnetic head 29 is retracted to the outer edge portion of the flat coil 86 of the actuator 29. It has a retracting magnet 85 for operating. Further, a retracting yoke 87 is arranged above and below the retracting magnet 85 to form a closed magnetic circuit. In the variable gap magnetic circuit configured by this closed magnetic circuit, the state in which the gap magnetic flux density is high is always stable, and therefore the force that moves to the side where the magnetic flux density is higher acts. Therefore, Fig. 83 ~
In the example of Fig. 84, the magnet 85 has a tapered gap,
This is due to the force acting to move toward the narrower gap. In this example, the further to the right, that is, the magnetic head
As the moving distance x of 29 increases, the gap value g decreases, and further, at the lock position where the head 29 is finally locked, a change is provided so that the gap sharply narrows. ing.

More specifically, the graph of FIG. 85 and the graph of FIG.
As shown in the gap changing structure in FIG. 86, in the data zone, an arbitrary integration constant x _{0 is set} to the moving distance x of the magnetic head.
The gap G in the magnetic circuit is set so that the gap value g is proportional to the reciprocal of the sum x + x ₀ , and the stepped portion 87-1 is formed in the yoke 87 so that the gap value g sharply narrows in the lock region. Is forming. With such a shape,
In the data zone, a constant torque larger than the static friction of the bearing means 46 is generated, and a large holding torque is obtained because this torque rapidly increases in the lock area of the outer portion of the magnetic disk, for example, to ensure the locking of the magnetic head. To be done.

FIG. 87 is a diagram showing a magnetic circuit model for explaining the principle of the retracting mechanism of the magnetic head according to the present invention.

Generally, there are several methods for calculating the magnetic attraction force, but here, the most easily used rate of change of magnetic energy will be described.

The magnetic energy W of the system represented by the magnetomotive force NI, the magnetic flux φ, and the magnetic resistance R is expressed as W = 1/2 φ ² R = 1/2 NI φ = 1/2 (NI) ² / R .

The generated force is F = dW / dx = −1 / 2 (NI) ² / R ² dR / dx = −1 / 2 φ ² dR by differentiating the magnetic energy in the moving direction.
/ Dx

Here, consider the magnetic circuit model as shown in FIG. In this case, the magnetic energy is
Stored in York. Here, l _g: (including a magnet thickness) air gap distance l _m: thickness of the magnets S ': cross-sectional area of the magnet mu _o: permeability in air mu _r: recoil permeability H _e: at the operating point Intersection of demagnetization curve tangent to B = 0 (linearized coercive force) B _r : Intersection of demagnetization curve tangent to demagnetization curve and H = 0 at operation point (linearized residual magnetic flux density) (B _r = μ _r H _e ) In this case, if the magnetic resistance in the yoke is neglected (assuming that there is no magnetic energy), the magnetic resistance R of this magnetic circuit is given by the following equation (1).

[0362]

[Equation 1]

It is expressed as follows. Here, if the _{μ o = μ r, R =} l g / (μ o S ') on the other hand, the magnetomotive force NI is because a NI = H _e l _m, the area S' assuming that there is no change, phi = NI
_{/ R = μ o S'H e l} m / l g dR / dx = 1 / (μ o S ') dl g / dx Accordingly, the generated force is represented by the following equation [Equation 2].

[0364]

[Equation 2]

From the above, the magnet is thicker than the gap,
If the rate of change of the gap is large, a large generating force can be obtained. In order to obtain a constant force regardless of the position x,
The relationship expressed by the following equation (3) is established.

[0366]

[Equation 3]

Actually, it is difficult to manufacture such a functional shape. Therefore, if the gap distance l _g is made sufficiently large with respect to the magnet thickness l _m , a substantially constant torque can be obtained even with a linear change. It can occur.

When used as a lock, a step may be provided so that this gap change is sufficiently large.

FIG. 88 is a graph showing the results of actual measurement of torque in the gap retracting type head retracting mechanism. According to this measurement result, a substantially constant retracting force is obtained within the entire stroke (total rotation angle) of the magnetic head 27, and the retracting force is about 4 to 9 times the retracting force at the lock position on the right side of the graph. Sufficient performance is obtained as a locking mechanism that generates torque. As is clear from the actual measurement result in FIG. 88 and the magnetic circuit model in FIG. 87, the holding torque at the lock position becomes larger as the magnet 87 is thicker (1 _m larger).

Further, FIG. 89 is a perspective view showing an example of an area-changing type head retracting mechanism. In FIG. 89, in the plane between the positioning magnet 85 and the positioning coil 87, the area where the positioning magnet 85 and the positioning yoke 87 overlap is changed in the direction in which the magnetic head 29 is displaced. It is configured to retract the lever head 29. More specifically, the area where the magnet 85 and the yoke 87 overlap is configured to be linearly increased toward the right, and another step portion 87- 2, the width of the yoke 28 is sharply increased. In such a configuration,
Using the magnetic circuit model shown in FIG. 87, the change in the retracting force with respect to the moving distance x can be calculated. From this calculation _{result, dR / dx = -l g /} (μ o S '2) dS / dx is obtained. Therefore, the generated force is, as shown in the following equation (4),

[0371]

[Equation 4]

Therefore, a constant force can be obtained by the linear change of the area S '. Further, in the lock area, a step portion is provided as in FIG. 85 to increase the holding torque to securely lock the magnetic head.

FIG. 90 is a diagram showing another example of the retracting mechanism of the magnetic head in the magnetic disk device according to the present invention. Here, without installing the magnet 85 in the movable part, the magnet 85 which is a permanent magnet is incorporated in a part of the yoke 87 of the fixed part, and the iron piece which is a soft magnetic material is provided in the gap in the movable part. ing. Even in this case, the same effect as the other examples can be obtained. However, in this case, a magnetic circuit other than the gap is easily formed, and in that case, a part of the magnetic flux generated by the permanent magnet does not contribute to the generation of the retracting force, which makes the design of the magnetic circuit somewhat difficult. In this embodiment, the yoke 87 is made of sheet metal that is substantially concentric with the center of rotation, and has a V-shaped or other shaped groove at the center finished to a predetermined shape.

In any of the head retracting mechanism and the lock mechanism of the present invention, a simple mechanism generates a substantially constant retracting force in the entire area of the magnetic disk, and a sufficiently large locking force is exerted at the lock position. It is possible to realize a small-sized and highly reliable magnetic disk device. Although the direction of the magnetic flux is the axial direction of the actuator pivot in these embodiments, the direction of the magnetic flux may be the radius.

FIG. 91 is an exploded perspective view showing an example of a housing composed of three separate elements. In the example shown in FIG. 91, the components other than the housing are essentially the same as those in many other embodiments, and therefore the parts other than the housing are omitted.

Here, in the housing of the magnetic disk device, the lower flat plate-shaped base portion 122, the upper flat plate-shaped cover portion 123, and the frame-shaped frame portion 121 arranged laterally are provided.
Composed of and. Further, the thickness of the frame portion 121 is designed in advance so that the disc, the disc drive portion, the head mechanism portion and the like can be housed inside the housing.

Furthermore, the base portion 122 and the cover portion 123
If is made of an iron-based metal having higher rigidity than aluminum or the like, the thickness of the base portion 122 and the cover portion 123 can be reduced. Furthermore, if one of iron-based metals that is a magnetic material is used as the yoke member of the spindle / actuator motor, the overall thickness of the device can be further reduced. On the other hand, examples of the material of the frame portion 121 arranged so as to be sandwiched between the base portion 122 and the cover portion 123 include aluminum and the like which can be easily manufactured by die casting or the like.

As described above, the base portion 122 and the cover portion 12
If a magnetic material is used for 3, the base portion 122 and the cover portion 123 can be used as the yoke of the spindle motor and the actuator motor, or can be used as the auxiliary yoke of the main yoke. It also has the effect of a magnetic shield. In addition, when the material of the frame portion 121 is also a magnetic material containing iron or the like, there is an advantage that the effect of the magnetic shield is further obtained as compared with the case where only the base portion 122 and the cover portion 123 are magnetic materials.

FIG. 92, FIG. 93, FIG. 94 and FIG.
FIG. 3 is a view showing a most preferable example of a disc device having an entire structure in which one disc and two heads are incorporated in a housing according to the present invention. Specifically, FIG. 92 is a front sectional view of the whole structure, FIG. 93 is a perspective view showing the main part of the whole structure, FIG. 94 is a developed perspective view of a printed circuit board, and FIG. 95 is various parts. FIG.

As shown in these figures, the disk device as a whole consists of the following components. One disk with a diameter of 1.89 inches or less, a disk drive that rotates the disk, and read / write on the surface of the disk that is the recording medium
Two magnetic heads for writing, an arm for supporting the magnetic heads, an actuator carriage for rotatably supporting the arms, a bearing for allowing the actuator carriages to rotate, an actuator carriage for rotation, and the magnetic heads for recording media. An actuator drive for moving the disk surface to a predetermined position, and a base and a cover which are combined with each other to form a housing (the housing includes at least the disk, the disk enclosure, the disk drive, the magnetic head, and the actuator carriage). , A bearing and an actuator drive section), and a circuit for controlling read / write operations by at least the disk drive section, the magnetic head and the positioner drive section.

In this case, the above-mentioned circuit is composed of a flexible printed circuit board built in the housing, and the height of the magnetic disk device is PCMCIA.
It is about 5 mm based on Type II.

More specifically, in FIGS. 92 to 95, reference numeral 211 represents a base, 212 represents a cover, and 213
Reference numerals a and 213b represent a fixed shaft on the disk side and a fixed shaft on the actuator side. The base 211 and the cover 212 are
As shown in Figure 32, it is made from ferrous metals. This brings about an excellent magnetic shielding effect as described above. The lower side of each of the fixed shafts 213a and 213b shown in FIG. 42 is used, and in this case, the lower end of the flange main body is caulked (or press-fitted or welded) by a fastening method.
It is fixed at 211.

Further, the upper ends of the fixed shafts 213a and 213b are fastened to the cover 212 side by the structure shown in FIG.

On one shaft 213a, one magnetic recording medium (disk) 222 is rotatably held via a bearing and a spindle hub, and a spindle motor 220 is assembled. Further, an actuator 230 including a magnetic head 232 and an arm 238 is rotatably held within a predetermined angle range on a fixed shaft 213b on the actuator side. This actuator 230 uses the magnetic head 232 as a disk as described above.
It can be moved to and positioned at the desired track on 222.

Reference numeral 251 is a flexible circuit board. This one flexible circuit board 251 is attached to the base 21 with an appropriate adhesive as described in detail in FIG.
1 and the inner surface of the cover 212 are fixed by adhesion. On the printed circuit board 251, an electronic circuit component group 216 necessary for controlling the operation of the entire disk device (for example, a servo circuit, a spindle motor control circuit, a read / write circuit, an interface circuit, etc.) is a digital group circuit. And an analog group circuit, which are assembled and mounted. In addition, the printed circuit board 25
1 is connected to a connector 217 supported by the base 211 and the cover 212. Further, when the connector 217 is connected to the plug-in portion of an external electronic device (for example, a portable notebook computer), the magnetic disk device shown in FIGS. 92 to 95 works as an external memory device for the external electronic device.

Further, in these figures, the spindle motor 220 is preferably a flat coil type DCM having an axial (axial) gap. That hub
221 supports the disc 222 by adhesion. Further, the magnet 224 is fixed in the spindle hub 221 by gluing. The magnet 224 is arranged parallel to the magnetic recording medium 222 and is multipolarly magnetized in the vertical direction. Also,
The spindle hub 221 functions as a yoke for the magnet 224.

Further, 227a is an upper surface bearing of the disk, and 227b is a lower side bearing thereof. 228 is the upper bearing 227a
It is a spacer for maintaining a constant gap between the lower bearing 227b and the lower bearing 227b. Both inner rings of the upper bearing and the lower bearing are joined and fixed to the fixed shaft 213a. Spindle hub 221
Is made of iron. The inner peripheral portion of the spindle hub 221 is joined to both outer rings of the upper bearing 227a and the lower bearing 227b. Below the magnet 224, there are multiple coils 225,
Each coil is concentrically formed on the flexible substrate,
The coils are evenly divided and arranged. The brushless magnetic circuit is composed of a spindle hub 221 and a magnet 224.
And the coil 225 and the base 211. Each lead wire (not shown in FIGS. 92 to 95) coming out from each coil 225 is connected to a corresponding terminal on the printed circuit board 251 by soldering, so that the spindle motor
The current for driving 220 is supplied to each coil 225 through its respective lead. By supplying a current to the coil 225, a driving force is generated in the magnetic circuit to rotate the hub 221.

Further, the magnetic head 232 and the arm 238.
The structure of the actuator 230 including the above will be described in detail. 225a is a rear bearing of the actuator 230, and 225b is an upper bearing thereof. 236 is the rear bearing 235a and the upper bearing 235b
It is a spacer for maintaining a constant gap between and. Both inner rings of the upper bearing 235a and the lower bearing 235b are joined and fixed to the fixed shaft 213b. 231 is an iron-based block. The inner peripheral portion of the block 231 is joined to both outer rings of the upper bearing 235a and the lower bearing 235b.

Further, the arm 238 is axially connected to the block 231 by laser spot welding. The two magnetic heads 232 are joined and fixed to one end of each arm 238. The two magnetic heads 232 face both sides of the magnetic recording medium 222. In addition, the coil 233 for driving the actuator 230 is
It is located on the opposite side of 238 and is made of resin and blocks 23
Stick to 1.

Reference numeral 234 denotes a flexible printed circuit board, which serves as a signal path for transferring a read / write signal between the magnetic head 232 and the control circuit and a feeder for supplying a current to the coil of the actuator. The flexible printed circuit board 234 is connected to the flexible printed circuit board 251 on the side opposite to the magnetic head 232 by soldering.

The driving force for moving each magnetic head 232 to a desired position on the disk surface is VC shown in FIG.
This VCM obtained by M (Voice Coil Motor)
Is composed of an upper yoke 241, a lower yoke 242, side yokes 243a and 243b, a magnet 244, and coils 233 arranged in the magnetic circuit 240, which form the magnetic circuit 240. When a current is applied to these coils 233, actuator 230 rotates.

In this case, as the magnetic head 232, the contact type integrated magnetic head for perpendicular magnetic recording disclosed in Japanese Patent Laid-Open No. 3-178017 is used to achieve a light load and a low voltage. . However, if the load / unload mechanism is adopted, a normal magnetic head, that is, a head that performs horizontal magnetic recording and that includes a head slider having a predetermined flying height may be used instead of the integrated magnetic head. it can.

In such a structure, a space that cannot be occupied usually occurs at the upper and lower ends of the housing except for the vicinity of the shaft and the actuator.

Therefore, various circuits can be incorporated in the space, and the space can be effectively used in the housing.

Further, in the embodiment shown in FIGS. 92 to 95, the external dimensions of the disk device are PCMCIA or J
It conforms to the dimensions of the IC memory card specifications that comply with the EIDA standard specifications. Furthermore, by using a magnetic recording medium (disk) having a diameter of, for example, about 1.3 inches (1.89 inches or less), the connector of the disk device can be made the same as the connector of the IC memory card, and the size is also large. It is equivalent to an IC memory card,
Furthermore, if the interface specifications are the same, it is possible to provide compatibility with the IC memory card.

After all, according to the one-disk magnetic disk device of the present invention, the storage capacity can be set to 40 MBytes or more while the height is set to 5 mm or less.

[Brief description of drawings]

FIG. 1 is a diagram (No. 1) showing an example of a disk device according to a conventional technique.

FIG. 2 is a diagram (part 2) showing an example of a disk device according to a conventional technique.

FIG. 3 is a diagram (No. 1) showing a first preferred embodiment of the disk device according to the present invention.

FIG. 4 is a diagram (No. 2) showing the first preferred embodiment of the disk device according to the present invention.

FIG. 5 is a diagram (No. 3) showing the first preferred embodiment of the disk device according to the present invention.

FIG. 6 is a view (No. 4) showing the first preferred embodiment of the disk device according to the present invention.

FIG. 7 is a view (No. 5) showing the first preferred embodiment of the disk device according to the present invention.

FIG. 8 is a diagram (No. 6) showing the first preferred embodiment of the disk device according to the present invention.

FIG. 9 is a diagram (No. 7) showing the first preferred embodiment of the disk device according to the present invention.

FIG. 10 is a diagram showing a second preferred embodiment of the disk device according to the present invention.

FIG. 11 is a diagram showing a third preferred embodiment of the disk device according to the present invention.

FIG. 12 is a diagram showing a fourth preferred embodiment of the disk device according to the present invention.

FIG. 13 is a diagram showing a fifth preferred embodiment of the disk device according to the present invention.

FIG. 14 is a diagram showing a sixth preferred embodiment of the disk device according to the present invention.

FIG. 15 is a view (No. 1) showing a seventh preferred embodiment of the disk device according to the present invention.

FIG. 16 is a view (No. 2) showing the seventh preferred embodiment of the disk device according to the present invention.

FIG. 17 is a diagram showing a seventh preferred embodiment of the disk device according to the present invention (No. 3).

FIG. 18 is a view (No. 4) showing a seventh preferred embodiment of the disk device according to the present invention.

FIG. 19 is a view (No. 5) showing the seventh preferred embodiment of the disk device according to the present invention.

FIG. 20 is a view showing a modification of the tongue-shaped enclosure portion of the seventh preferred embodiment of FIG.

FIG. 21 is a diagram showing another modification of the enclosure portion of the tongue portion of the seventh preferred embodiment of FIG.

FIG. 22 is a diagram showing an eighth preferred embodiment of the disk device according to the present invention.

FIG. 23 is a diagram showing a ninth preferred embodiment of the disk device according to the present invention.

FIG. 24 is a diagram (No. 1) showing the tenth preferred embodiment of the disk device according to the present invention.

FIG. 25 is a view (No. 2) showing the tenth preferred embodiment of the disk device according to the present invention.

FIG. 26 is a diagram showing an eleventh preferred embodiment of a disk device according to the present invention.

FIG. 27 is a diagram showing a twelfth preferred embodiment of a disk device according to the present invention.

FIG. 28 is a diagram showing a thirteenth preferred embodiment of a disk device according to the present invention.

FIG. 29 is a diagram showing a fourteenth preferred embodiment of a disk device according to the present invention.

FIG. 30 is a view (No. 1) showing a fifteenth preferred embodiment of a disk device according to the present invention.

FIG. 31 is a view (No. 2) showing the fifteenth preferred embodiment of the disk device according to the present invention.

FIG. 32 is a diagram (No. 3) showing the fifteenth preferred embodiment of the disk device according to the present invention.

FIG. 33 is a view (No. 4) showing a fifteenth preferred embodiment of a disk device according to the present invention.

FIG. 34 is a view (No. 5) showing the fifteenth preferred embodiment of the disk device according to the present invention.

FIG. 35 is a diagram showing a sixteenth preferred embodiment of a disk device according to the present invention.

FIG. 36 is a diagram showing a seventeenth preferred embodiment of a disk device according to the present invention.

FIG. 37 is a drawing showing an eighteenth preferred embodiment of a disk device according to the present invention.

38 is a diagram showing another example of a frame applied to the disc device according to the present invention in FIG. 32. FIG.

FIG. 39 is a view showing a first preferred embodiment of the fixed shaft structure of the disk device according to the present invention.

FIG. 40 is a diagram showing a second preferred embodiment of the fixed shaft structure of the disk device according to the present invention.

FIG. 41 is a diagram showing a third preferred embodiment of the fixed shaft structure of the disk device according to the present invention.

42 is a diagram for explaining the relationship between the diameter of each fixed shaft in FIG. 39 and the average spacing between a pair of bearing means.

43 is a view for explaining the bias means on the outer ring portion of the bearing means of FIG. 39. FIG.

FIG. 44 is a view (No. 1) showing a fourth preferred embodiment of the fixed shaft structure of the disk device according to the present invention.

FIG. 45 is a view (No. 2) showing the fourth preferred embodiment of the fixed shaft structure of the disk device according to the present invention.

FIG. 46 is a view (No. 3) showing the fourth preferred embodiment of the fixed shaft structure of the disk device according to the present invention.

FIG. 47 is a view showing a modified example of the shaft-cover mounting structure of the fourth preferred embodiment of FIG. 46.

FIG. 48 is a view (No. 1) showing a fifth preferred embodiment of the fixed shaft structure of the disk device according to the present invention.

FIG. 49 is a view (No. 2) showing the fifth preferred embodiment of the fixed shaft structure of the disk device according to the present invention.

FIG. 50 is a diagram showing a first preferred embodiment of the overall structure of the spindle motor of the disk device according to the present invention.

FIG. 51 is a diagram showing a second preferred embodiment of the overall structure of the spindle motor of the disk device according to the present invention.

FIG. 52 is a diagram showing a third preferred embodiment of the overall structure of the spindle motor of the disk device according to the present invention.

FIG. 53 is a diagram showing a fourth preferred embodiment of the overall structure of the spindle motor of the disk device according to the present invention.

FIG. 54 is a diagram showing a fifth preferred embodiment of the entire spindle motor structure of the disk device according to the present invention.

FIG. 55 is a diagram showing a sixth preferred embodiment of the entire spindle motor structure of the disk device according to the present invention.

56 is a view showing a modified example of the disc fixing structure of the sixth preferred embodiment of FIG. 55. FIG.

FIG. 57 is a diagram for explaining a means for correcting the imbalance phenomenon of the disk fixing structure.

FIG. 58 is a diagram showing a first modification of the frame displayed in FIG. 38.

FIG. 59 is a diagram showing a second modification of the frame displayed in FIG. 38.

FIG. 60 is a diagram showing a third modification of the frame displayed in FIG. 38.

FIG. 61 is a view (No. 1) showing an example of the lock structure of the head mechanism portion in the disk device according to the present invention.

FIG. 62 is a view (No. 2) showing an example of the lock structure of the head mechanism portion in the disk device according to the present invention.

FIG. 63 is a view (No. 3) showing an example of the lock structure of the head mechanism portion in the disk device according to the present invention.

FIG. 64 is a view (No. 4) showing an example of the lock structure of the head mechanism portion in the disk device according to the present invention.

FIG. 65 is a view (No. 5) showing an example of the lock structure of the head mechanism portion in the disk device according to the present invention.

FIG. 66 is a view (No. 6) showing an example of the lock structure of the head mechanism portion in the disk device according to the present invention.

FIG. 67 is a view (No. 7) showing an example of the lock structure of the head mechanism portion in the disk device according to the present invention.

FIG. 68 is a diagram showing a first preferred embodiment of a spindle motor structure capable of reversely fixing a disc in a disc device according to the present invention.

FIG. 69 is a view showing a second preferred embodiment of the spindle motor structure capable of reversely fixing the disc in the disc device according to the present invention.

FIG. 70 is a diagram showing a first preferred embodiment of the actuator structure in the disk device according to the present invention.

FIG. 71 is a view (No. 1) showing a second preferred embodiment of the actuator structure in the disk device according to the present invention.

FIG. 72 is a view (No. 2) showing a second preferred embodiment of the actuator structure in the disk device according to the present invention.

FIG. 73 is a view (No. 3) showing a second preferred embodiment of the actuator structure in the disk device according to the present invention.

FIG. 74 is a view (No. 1) showing a third preferred embodiment of the actuator structure in the disk device according to the present invention.

FIG. 75 is a view (No. 2) showing a third preferred embodiment of the actuator structure in the disk device according to the present invention.

FIG. 76 is a diagram showing a fourth preferred embodiment of the actuator structure in the disk device according to the present invention.

FIG. 77 is a diagram showing another embodiment of the actuator structure in the disc device according to the present invention.

78 is a view (No. 1) showing an improved example of the first preferred embodiment of the overall structure of the spindle motor as in FIG. 50; FIG.

79 is a view (No. 2) showing an improved example of the first preferred embodiment of the overall structure of the spindle motor as in FIG. 50; FIG.

80 is a view (No. 3) showing an improved example of the first preferred embodiment of the overall structure of the spindle motor as in FIG. 50; FIG.

81 is a diagram (No. 4) showing an improved example of the first preferred embodiment of the overall structure of the spindle motor as in FIG. 50; FIG.

82 is a diagram showing another improved example of the first preferred embodiment of the overall structure of the spindle motor as in FIG. 50; FIG.

FIG. 83 is a view (No. 1) showing a preferred embodiment of the head retracting structure in the disk device according to the present invention.

FIG. 84 is a view (No. 2) showing a preferred embodiment of the head retracting structure in the disk device according to the present invention.

85 is a graph for explaining the relationship between the displacement of the magnetic head and the gap value in FIG. 84.

86 is an enlarged perspective view of FIG. 84. FIG.

FIG. 87 is a diagram showing a magnetic circuit model for explaining the principle of the retracting mechanism of the magnetic head according to the present invention.

FIG. 88 is a graph showing the result of actual measurement of torque in the gap retracting type head retracting mechanism.

FIG. 89 is a perspective view showing an example of a head retracting mechanism of variable area.

FIG. 90 is a diagram showing another example of the retracting mechanism of the magnetic head in the magnetic disk device according to the present invention.

FIG. 91 shows another example of a housing made up of three separate elements.

FIG. 92 is a view (No. 1) showing an example of a disk device having an overall structure in which one disk and two heads are incorporated in the housing according to the present invention.

FIG. 93 is a view (No. 2) showing an example of a disk device having an overall structure in which one disk and two heads are incorporated in the housing according to the present invention.

FIG. 94 is a view (No. 3) showing an example of a disk device having an overall structure in which one disk and two heads are incorporated in the housing according to the present invention.

FIG. 95 is a view (No. 4) showing an example of a disk device having an overall structure in which one disk and two heads are incorporated in the housing according to the present invention.

[Explanation of symbols]

14 ... Printed circuit board 15 ... Disk drive means 20 ... Magnetic disk device 21 ... Housing 22 ... Base 23 ... Cover 24 ... Magnetic disk 25 ... Spindle 26 ... Spindle motor 26-1 ... First fixed shaft 26-3 ... Rotor magnet 26-4 ... Stator coil 27 ... Magnetic head 28 ... Arm 29 ... Actuator 32 ... Anisotropically conductive adhesive 36 ... Read / write circuit 38 ... Control circuit 39 ... Interface circuit 40 ... Flexible printed circuit board 45 ... Second fixed shaft 65 ... Magnetic circuit 67 ... Flat coil 68 ... Yoke part 85 ... Positioning magnet 87 ... Positioning yoke

Continued front page    (31) Priority claim number Japanese Patent Application No. 4-5433 (32) Priority date January 16, 1992 (January 16, 1992) (33) Priority claiming country Japan (JP) (31) Priority claim number Japanese Patent Application No. 4-53177 (32) Priority date March 12, 1992 (March 12, 1992) (33) Priority claiming country Japan (JP) (31) Priority claim number Japanese Patent Application No. 4-61704 (32) Priority date March 18, 1992 (March 18, 1992) (33) Priority claiming country Japan (JP) (31) Priority claim number Japanese Patent Application No. 4-63640 (32) Priority date March 19, 1992 (March 19, 1992) (33) Priority claiming country Japan (JP) (31) Priority claim number Japanese Patent Application No. 4-115771 (32) Priority date May 8, 1992 (May 8, 1992) (33) Priority claiming country Japan (JP) (31) Priority claim number Japanese Patent Application No. 4-171372 (32) Priority date June 30, 1992 (June 30, 1992) (33) Priority claiming country Japan (JP) (31) Priority claim number Japanese Patent Application No. 4-211149 (32) Priority date August 7, 1992 (August 1992) (33) Priority claiming country Japan (JP) (72) Inventor Yasumasa Kurobane             1015 Kamiodanaka, Nakahara-ku, Kawasaki City, Kanagawa Prefecture             Within Fujitsu Limited (72) Inventor Toru Kohei             1015 Kamiodanaka, Nakahara-ku, Kawasaki City, Kanagawa Prefecture             Within Fujitsu Limited (72) Inventor Takao Sugawara             1015 Kamiodanaka, Nakahara-ku, Kawasaki City, Kanagawa Prefecture             Within Fujitsu Limited (72) Inventor Yu Matsumoto             1015 Kamiodanaka, Nakahara-ku, Kawasaki City, Kanagawa Prefecture             Within Fujitsu Limited (72) Inventor Hiroyuki Mase             1015 Kamiodanaka, Nakahara-ku, Kawasaki City, Kanagawa Prefecture             Within Fujitsu Limited (72) Inventor Masao Tsunekawa             1015 Kamiodanaka, Nakahara-ku, Kawasaki City, Kanagawa Prefecture             Within Fujitsu Limited (72) Inventor Shin Kanazawa             1015 Kamiodanaka, Nakahara-ku, Kawasaki City, Kanagawa Prefecture             Within Fujitsu Limited (72) Inventor Keiji Ariga             1015 Kamiodanaka, Nakahara-ku, Kawasaki City, Kanagawa Prefecture             Within Fujitsu Limited

Claims (5)

[Claims] 1. A disk for storing information and having a diameter of 1.89 inches or less, a disk drive section for rotating the disk, and a head mechanism section for writing and reading information to and from the disk. An electronic circuit including an interface circuit is provided inside the housing, and a connector connected to the electronic circuit is provided outside the housing, and an outer dimension of a plane including the housing and the connector is about 8
A disk device having a size of 5.6 mm × 54 mm and a thickness of 8 mm or less. 2. The disk device according to claim 1, wherein the one disk and the two heads provided in the head mechanism section are configured to perform perpendicular magnetic recording. 3. The disk device according to claim 2, wherein each of the two heads is an integrated magnetic head having a flexible thin plate-shaped main body and also acting as an arm for supporting the head. 4. The disk device according to claim 1, wherein the one disk and the two heads provided in the head mechanism section are configured to perform horizontal magnetic recording. 5. The disk device according to claim 1, wherein the base and the cover forming the housing are manufactured by press-molding an iron-based metal.