JP2002367356A - Disk device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a disk device which can be utilized as an external memory of a computer system, has a sufficient memory capacity at a low cost and can be provided with compactness, lightness in weight, lower electric power consumption and mechanical impact resistance which are the advantages of an IC memory card. SOLUTION: This disk device has a connector which is fixed to the outside of a housing including a base and a cover, a disk driving section which includes a spindle motor for rotating a disk to store information, a head mechanism section which writes and reads the information to and out of the disk and an electronic circuit including an interface circuit within the housing. The spindle motor has first bearing means for rotatably supporting the disk and a first fixing shaft for fixing the first bearing means into the prescribed position in the housing. The first fixing shaft is fitted into the base and is fixed by caulking. The external form dimensions including the housing and the connector are so set as to have interchangeability with the dimensions of the IC memory card standardized by a PCMCIA-ATA.

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 and a magneto-optical disk which can be used as an external memory of a computer system. More specifically, the present invention relates to the overall structure of a disk device including a credit card-sized housing, a circuit portion, and various mechanical components in the housing.

[0002]

2. Description of the Related Art In general, a disk drive, such as a magnetic disk drive, having at least one magnetic disk used as a storage medium, is one of the promising nonvolatile memories in various fields including computer systems. It has been put to practical use. More recently,
Technical improvements such as an increase in the storage density of a magnetic disk in a magnetic device have been made remarkably, and as a result, the size of the magnetic disk device itself has been reduced. On the other hand, due to the rapid development of microelectronics in recent years, computer systems and the like have been reduced in size, weight and power consumption as typified by portable personal computers.

As described above, the technology for downsizing the magnetic disk drive has made remarkable progress in recent years. However, when a magnetic disk having a diameter of 2.5 inches is used, the magnetic disk drive is required to be compact. Becomes too large, too heavy, and even too power consuming.
For this reason, it is difficult to apply the above-mentioned current magnetic disk device to the above-mentioned portable personal computer which is required to be reduced in size, weight and power consumption. In response to this demand, recently, a magnetic disk drive using a magnetic disk having a diameter of 1.89 inches has been proposed. This magnetic disk drive is certainly smaller than a magnetic disk drive having a diameter of 2.5 inches. However, in such a magnetic disk drive composed of a magnetic disk having a diameter of 1.89 inches, the prior art is diverted to miniaturization without any improvement. This creates a problem. That is, the size of the magnetic disk device, especially its thickness, is still too large to be practically used by a portable type device (recently, the minimum thickness is said to be about 10 mm). ). Yet another problem arises. That is, even if the above-mentioned disk device is applied to the above-mentioned portable device, such a magnetic disk device is not affected by mechanical shock caused by an external factor such as dropping the portable device. Is not enough to withstand.

Further, US Pat. No. 4,639,863 and
No. 4,860,194 discloses a module unit disk file subsystem in which a printed print is extended directly to the side of the housing containing the head and disk mechanism to make it thinner. A circuit board is attached. However, the prior art does not disclose a specific thickness by adopting 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 is larger than usual.

[0005] In view of such a situation, known portable personal computers and the like currently used at present temporarily use an integrated circuit (IC) memory card rather than using a magnetic disk. Size and weight are secured. 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
According to this specification, the card thickness is specified to be 5 mm or 3.3 mm. A card that satisfies the standard specifications is sufficiently small and light enough. Therefore, the above-mentioned card is suitable for application to a partner personal computer in terms of size and weight.

[0006]

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

First, a computer system using an IC memory card is extremely expensive. Specifically, the cost per megabyte is tens of thousands of yen /
MByte, which is hundreds of times higher than a computer system using a flexible disk device, and tens of times higher than a hard disk device (ie, a magnetic disk device). Second, the storage capacity of the entire computer system using the IC memory card is not always sufficient to meet the general demands of users. At present, IC memory cards having a storage capacity of about 1 MByte are mainly used. In addition, the storage capacity of this IC memory card will increase from several MBytes to the order of 10 MBytes in the future. On the other hand, at present, an ideal portable personal computer actually requires a memory system of 40 MByte or more. Therefore, a computer system using the above-mentioned IC memory card does not substantially satisfy the demand for storage capacity. Further, it is anticipated that in the near future the storage capacity demanded by users will be even further increased. For this reason, even considering that the IC memory technology is further developed,
It is difficult for the storage capacity of the C memory card to catch up with the required storage capacity.

As described above, if the conventional magnetic disk drive is used in a portable personal computer, it will be sufficient in terms of cost and storage capacity. However, they are not sufficient in terms of size, weight, power consumption and mechanical shock resistance. Conversely, an IC memory card used in a portable personal computer is sufficient in terms of size, weight, power consumption, and mechanical shock resistance. However, the cost of an IC memory card is too high and its 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 have both the advantages of the magnetic disk device and the advantages of the IC memory card.

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

[0010] As described above, if the length is 10.5 mm, a magnetic disk drive can be realized by using the conventional technology, and such a product is currently announced. However, it is necessary to reduce the thickness of a notebook personal computer, and arranging two slots vertically becomes an obstacle to the reduction in thickness. In addition, only one slot can be prepared in a palmtop personal computer. That is, not all devices can substitute for an IC memory card. Therefore, realization of a magnetic disk device having the same outer dimensions as Type-I and Type-II, that is, having a thickness of 5 mm or less is strongly desired.

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

Still another object of the present invention is that the thickness is equal to 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. To provide a magnetic disk device that is stable with respect to

[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; a disk drive for rotating the disk; It comprises a head mechanism for writing and reading information to and from the disk, and an electronic circuit. Here, at least one connector connected to the electronic circuit is fixed to the outside of the housing.

Further, the electronic circuit includes an interface circuit for enabling communication with an external host system, a write / read circuit for receiving a read signal from the head mechanism and supplying a write signal to the head mechanism, and a disk drive. A servo circuit that controls the operation of a head unit and a head mechanism unit; and a control circuit that receives a control signal from the host system via the interface circuit and supplies 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 / reproducing corresponding to reading / writing of information at a predetermined position on the disk, a supporting spring mechanism for supporting the head, and the supporting spring mechanism. An arm that supports
A rotary actuator for rotating the arm to move the head to a predetermined position on the disk.

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

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

[0018] More preferably, an insertion guide portion for inserting the housing into a slot of an external device and operating the disk device is thinner than the entire thickness of the housing on both sides in the longitudinal direction. It is configured as follows.

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

[0020] More preferably, the base and the cover each have a connecting flange on the outer periphery of the base and the cover, and the housing is formed by joining the connecting flanges to each other. In this case, the base and the cover are made by molding an iron-based metal, a metal containing aluminum, or a resin member.

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

[0022] More preferably, the disk drive includes a spindle motor disposed inside the disk for rotating the disk. Further, the spindle motor has a first fixed shaft fixed to a predetermined position of the housing for rotatably supporting the disk, and upper and lower sides of the first fixed shaft for supporting the disk. And a pair of first bearing means attached to the first bearing means.

Further, the head mechanism section includes a rotary actuator for moving the head to a predetermined position on the disk, a second fixed shaft fixed to a predetermined position in the housing, A pair of second bearing means mounted on the upper and lower sides of the second fixed shaft for supporting the disk, wherein the second fixed shaft is fitted and fixed in the base. You.

More preferably, the first fixed shaft and the second fixed shaft are connected to a part of the first and second fixed shafts, and the first and second fixed shafts are securely connected 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 respectively fixed to the first fixed shaft and the second fixed shaft. It has the above diameter.

[0025] More preferably, the fixed shaft on the disk side and the fixed shaft on the actuator side are firmly connected to the cover in the thickness direction of the housing. More specifically, one end of the fixed shaft on the disk side and one end of 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 to the central opening of the magnetic disk. And a spindle hub having an inner periphery rotatably mounted via bearing means, a rotor magnet secured to the spindle hub, and at least one stator coil secured 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 on the upper and lower sides that is greater than the average distance between the pair of bearing means, and a magnetic disk, The centers of the rotor magnet and the pair of bearing means are located 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 is engaged with the outer periphery of the rotor magnet, and The periphery is rotatably supported on the spindle via bearing means, and the rotor magnet is configured to function as a spindle hub.

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

More preferably, a load / unload assembly is provided in the housing, and the magnetic head is associated with an insertion / removal operation for inserting the housing into a slot in the host equipment and removing the housing from the slot. Is loaded into a predetermined position on the magnetic disk,
Then, the magnetic head is unloaded from that position. Further, a lock assembly is provided within the housing to mechanically lock the magnetic disk and the actuator in place in connection with the above-described insertion / removal operation.

More preferably, the actuator is a flat coil located at one end of an actuator movable section (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 coil. Includes yokes and side yokes, and permanent magnets placed in either or both of the upper and lower yokes. In this case, the magnetic circuit is an upper yoke,
It is composed of a lower yoke, side yokes, and permanent magnets. Further, one or both of the upper yoke and the lower yoke are 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.

[0032] More preferably, the actuator comprises an upper yoke element having a plurality of first vent portions (first folds), each of which is bent substantially at a right angle downward, and a plurality of upper yoke elements each at a substantially right angle. Bent second
A movable coil type actuator including a lower yoke element having a bent portion (second bent portion). Further, a closed magnetic path 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, the retract magnet (retract magnet) provided on the outer edge of the actuator for retracting (retracting) the magnetic head and the periphery of the retract magnet are provided. 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 gap thickness g varies by approximately 1 / (x + x ₀ ) in relation to the movement value x of the magnetic head.

Alternatively, in a plane including a 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.

In addition, 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 performing read / write operations. It includes a head assembly (head mechanism), and further includes one connector connected to an electronic circuit outside the housing, and includes a rectangular housing having an area of approximately 85.6 mm × 54 mm in a planar direction. In such a configuration, the magnetic disk and the two magnetic heads are configured to perform perpendicular magnetic recording. 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 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]

BRIEF DESCRIPTION OF THE DRAWINGS The above objects and features of the present invention will become more apparent from the following description of preferred embodiments with reference to the accompanying drawings.

Here, before describing the embodiments of the present invention,
The related technology and its disadvantages are described below with reference to the related drawings.

FIGS. 1 and 2 show an example of the structure of a conventional disk drive. More specifically, FIG. 1 is a front view showing the entire structure of a conventional disk drive, and FIG. 2 is a conceptual diagram showing the circuit and mechanical components of FIG. 1 separately. It is.

In this case, the magnetic disk drive 1 has a double 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 amplification circuit 5
Etc. are contained in an inner housing 6, which is surrounded by an outer housing 7. In the space between the outer housing 7 and the inner housing 6, an IC 8 constituting a read / write circuit 8a is provided.
An IC 9 constituting the control circuit 8b, an IC 10 constituting the positioning circuit 8c, and an IC 10 'constituting the interface circuit 8d are incorporated. Further, a connector 7 'is attached to the outer housing 7.

Although such a magnetic disk drive 1 is usually housed in a fixed place, if necessary, it is carried and the connector 7 'is connected to an external host system, for example, a computer (not shown). And combined. Further, the information is read (reproduced) from the magnetic disk 2 using the read / write circuit 8a, and the information is written (recorded) on the same magnetic disk 2.

[0042] Viewed in more detail the circuit configuration, the control signal S _c and the address signal S _a is transmitted to the interface circuit 8d via the connector 7 'from the host computer. Then, the control signal S _c is input to the control circuit 8b, the status signal S _s indicating the state of the current in 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 for determining the position of the magnetic head mechanism 4 on the magnetic disk 2 according to a command from the host computer. Here, the information of the position read by the magnetic head mechanism 4 passes through the amplifier circuit 5 and is supplied to the position signal _Sp.
Is returned to the positioning circuit 8c, where accurate positioning is performed by the servo control means. In addition, power is supplied to all other circuits as well as all the above circuits.

In the prior art described above, the inner and outer housings 6 and 7 have a double structure, in which the disk drive 1 includes an inner housing 6 mainly including mechanical components, and the inner housing 6 It has an outer housing 7 which surrounds and mainly contains the electronics. 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 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 the thickness 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. There is therefore a strong need for a disk drive whose external dimensions, in particular its thickness, can be significantly reduced by obtaining a single-layer housing.

FIGS. 3, 4, 5, 6, 7, 8 and 9 show:
FIG. 2 is a diagram showing a preferred embodiment of a disk drive according to the present invention. More specifically, FIG. 3 is a perspective view showing the outer shape and dimensions of the magnetic disk drive; FIG. 4 is a perspective view partially showing the configuration inside the housing; FIG. FIG. 6 is a conceptual view showing a circuit portion and a mechanism 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;
FIG. 2 is an enlarged sectional view taken along the line II-II in the figure.

In the first preferred embodiment, as shown in these figures, the magnetic disk drive 20 comprises a single rectangular housing comprising a lower base 22 and an upper cover 23. Have. And the 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 magnetic disk drive 20 described above is a commonly used PCMCIA. It can have the same size as the size of Type II IC memory card.

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

Further, the disk drive means 15 includes a spindle motor 26 positioned 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. And a spindle 25 fixed at a predetermined position within 21.

Further, the head assembly includes at least one magnetic head 27 for executing a reproducing / recording operation corresponding to an information reading / writing operation on either the upper surface or the lower surface of the magnetic disk 24. , Magnetic head 27
And an actuator 29 that rotates 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 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 mg is obtained. Also, in the case of a floating head as shown in the figure, a light load head of several hundred mg can be used. Further, by applying a negative pressure type slider or a load / unload mechanism, the head friction at the time of starting the spindle can be improved. Can be almost ignored. With such an advantage, a spindle motor that can be started with a low power supply voltage is realized.

Further, the above-described electronic circuit includes an interface circuit 39 which enables communication with an external host computer.
And receive the read signal from the head assembly,
A read / write circuit 36 for supplying a write signal to the head assembly; a positioning circuit 37; a servo circuit having an amplifying circuit (head IC) 35 for controlling the operation of the magnetic disk 24 and the head assembly; It receives a control signal S _c through the interface circuit 39 from, and, and a supply control circuit 38 to the control signal read out S _c / write circuit 36 and the servo circuit. More particularly, the control signal and the S _c and the address signal S _a is transmitted through the connector 42 from the host computer to the interface circuit 39. Then, the control signal S _c
Is input to the control circuit 38 and the magnetic disk drive 20
Status signals S _s indicating the current status of it is sent from the control circuit 38 to the interface circuit 39. Further, the interface circuit 39 is coupled to a positioning circuit 37, where the position of the magnetic head 27 on the magnetic disk 24 is determined according to a command from the host computer. Here, the information at the above position read by the magnetic head 24 passes through the amplifier circuit 35 and becomes a position signal _Sp as a positioning circuit 37.
Where accurate positioning is performed by the servo control means. Further, power is supplied to all of the above circuits, as well as all other circuits, via connector 42.

Here, the interface signal referred to in the present invention will be supplementarily referred to. 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 electrical specifications different from those of PCMCIA-compliant IC memory cards, and therefore cannot be shared with IC memory cards. On the other hand, PCMCIA-ATA is a PCMCIA PC Card S
Since it is an extended function of tandard, the slot can be shared with the IC memory card. Thus, in the preferred embodiment, the interface can be said to be PCMCIA-ATA.

Further, the voltage of the power supply is preferably 3 to 3.3 V. In a general electronic circuit, power consumption can be reduced by operating at a low voltage.
An IC or the like that operates at a low voltage has been obtained by recent advances in circuit technology, but on the other hand, lowering the voltage for the mechanism does not lead to a reduction in power consumption.
Rather, the consumption ratio in the driven electronic circuit tends to increase, and the power consumption tends to increase. The device for the low voltage of the mechanism section is as follows if the main items are listed. First, the improvement of the spindle motor has made it possible to start at a low voltage, second, the load torque has been reduced by reducing the diameter of the bearing, and third, the start by adopting a light-load head. Fourth, the load torque can be reduced, and fourthly, the use of an iron housing improves noise resistance.

Also, as shown in FIG. 6, a plurality of insertion guide portions 50 are disposed on predetermined portions of each of the longer side surfaces of the housing 21. The insertion guide 50 described above is intended to allow the housing 21 to be inserted into a slot of the host computer, so that when the connectors are connected to each other by the insertion, the disk device will be put into operation. . 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 a substantially central position in the thickness direction of the housing 21. Therefore, a flat space 30 exists between the disk 24 and the base 22, while the disk 24 and the cover 23
There is another planar space 31 between them.

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

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

The electronic component 70 including all of the ICs 36a to 39a is a printed circuit board 14 (PCB: printed circuit board).
Are assembled on the respective surfaces of the first main body portion 40a and the second main body portion 40b, and those portions are respectively mounted close to the inner wall surfaces of the base 22 and the cover 23, and Electronic components (70) are printed circuit boards 14
Together with 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 at one long side of the housing 21 to form the lower first board. It is formed on the main body 40a and the upper second main body 40b. In this case, the flexible printed circuit board 40 is provided on the lower first main body 40.
a and the upper second main body portion 40b are connected to each other.
It has bands 40c and 40d of two connecting parts (relay parts). Here, the reason why the bent portion (relay portion) of the vertically integrated FPC is 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 FIG. 4 and FIG. As the signal flow is guided from the head to the head IC, the demodulation circuit (analog) of the read / write circuit, the digital processing circuit, and the connector, it is necessary to separate the analog part and the digital part vertically as described above. If this is taken into account, the signal or control signal leaving the demodulation circuit will pass through the relay. As the connection position, the short side and the long side of the rectangular housing can be considered. As described above, a connector is mounted on one short side, and a head actuator is installed on the other side. For this reason, when the FPC is connected on the short side, it must be connected on the head actuator side. This is disadvantageous 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, and this is made possible by hollowing out the FPC in this portion. Note that when the FPC is bent, it is advantageous to divide the connecting portion in order to reduce the elastic force.

As shown in FIG. 8, the connecting portion 40c
(40d) is positioned over the base 22 and the cover 23. Further, the housing 21 is closed and the cover 23 is closed.
When the cover comes to cover the base 22, the connecting portion 40c (40d) curves so as to protrude into the housing as shown in FIG. By providing an extra length in such a connection portion, the base covers can be arranged side by side and assembled. The longer the extra length, the more room for assembling becomes, but on the other hand, the overhanging portion interferes with the disk and other mounted components. In order to avoid this, it is proposed to further fold this overhang and fold it in multiple stages. Folding is realized by keeping the center of the bridge of the FPC with a wire or the like with the base and the cover arranged in a plane. In the closed state of the base 22 and the cover, the cover 23 is tightly adhered to the base 22 via, for example, the packing 41, so that the entire space including the disk and the like in the housing is closed tightly. In order to reduce a pressure difference between inside and outside due to a rise in temperature during operation, an air filter for breathing is generally attached to the housing. In this sense, the structure is not completely sealed, but a structure having a respiratory filter is usually also referred to as a sealed structure because dust is shielded from the outside air.

Further, a connector 42 is mounted on one of the two short sides of the housing. Here, the connector 42 is positioned at a position facing the actuator 29 with the disk 24 interposed therebetween, and is positioned at a substantially central position with respect to the thickness direction of the housing 21, whereby mechanical support of the entire disk device is achieved. The connector 42 can be realized with a good weight balance.

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

The retaining force of the connector is considerable because it has as many as 68 pins, but it is still necessary to consider disturbances. As a disturbance, as a force generated inside,
1. 1. Unbalanced vibration of spindle There is a seek reaction force of the actuator, to which external vibration and impact are applied.
Here, first, countermeasures are taken against two items that are internally generated.

First, unbalance vibration of the spindle always occurs during rotation and causes a position error. For this reason, in addition to taking measures such as minimizing the amount of residual unbalance as much as possible, measures are taken to reduce the influence even under the supporting conditions. Generally speaking, the unbalanced vibration is determined by a moment due to the distance between the spindle rotation center and the center of gravity or the supporting point. Therefore, in the present invention, the spindle is disposed near the connector and the actuator is disposed far from the connector in order to support the connector. Compared to the opposite configuration, the generated moment can be reduced by about 40%, whereby the position error due to unbalanced vibration can be reduced by 40%. When the actuator is perfectly balanced, only the rotational moment is generated, and this does not change at any position.Therefore, the adverse effect of arranging the actuator far from the connector is in principle. Absent.

As a countermeasure against the reaction force of the actuator, first, since the actuator is linearly supported by the connector, it becomes considerably rigid in the rotational direction, and the rotational motion of the entire drive due to the actuator generated moment is suppressed, and the position error due to the drive rotation is reduced. Holding down. By arranging this connector at the center in the thickness direction of the drive and by aligning the center of gravity of the actuator with this position, the vertical or torsional movement caused by the seek reaction force (moment) does not occur. This suppresses a position error, a floating fluctuation, and the like caused by the out-of-plane motion.

More precisely, the connector 42 is connected to the housing 21
And the second body portion 40b of the FPC 40
And electronic components of the digital group, such as the IC 39 of the interface circuit 39, on the second body part.
a are aggregated. Further, a part of the second main body part 40 b connected to the connector 42 is covered with the packing 41.

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

On the other hand, the disk drive having the structure according to the present invention as shown in the first preferred embodiment can effectively utilize the space in a single housing, and thereby, can provide electronic components, disks and It is intended to house all of the various mechanical components. As a result, the disk drive 20 may have a single housing configuration and may have the same thickness of about 5 mm as the PCMCIA Type II IC memory card described above. Thus, disk drive 20 is thinner and more compact than conventional disk drives, and can be more easily used for portable computers than conventional disk drives.

Further, the connecting portions 40c and 40d are connected to the above-mentioned FPC.
Because it is preformed in 40, two body portions 40a, 40
It is not necessary to provide a connector element for interconnecting between b. Due to the above advantages, the disk drive 20
Can have the thinner dimensions desired for true portable file storage.

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

First, an analog signal for analog circuit processing and a digital signal for other digital circuit processing are:
It is separated from each other on the lower side of the upper side of the housing.

Second, the disk substrate, generally made of metal, including aluminum, is positioned between the two separate circuit portions, ie, the disk substrate. Has a function that the two circuit units can be electromagnetically shielded from each other.

In such a configuration, it is possible to prevent analog signals in the analog circuit section from being mutually affected by electromagnetic waves generated by the digital circuit section. In other words, the disk drive in the first preferred embodiment has a configuration in which measures against various electrical noises can be employed without increasing the thickness of the disk drive. In that case, the thickness of the disk drive is reduced to 3.3 mm and the PCMCIA
What is the same as the case of Type I IC memory card,
Will be possible in the future.

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

FIG. 10 is a diagram showing a second preferred embodiment of the disk drive according to the present invention. More specifically, the tenth
The figure is a sectional front view showing a main part of a disk drive according to a second preferred embodiment of the present invention. In the following, parts that are the same as described above will be denoted using the same reference numerals.

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

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

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

As shown in FIGS. 12 (A) and (B), the first and second shielding walls 71 and 72 each have the form of a rib and are formed inside the base 22 and the cover 23. You.
The first shielding wall 71 on the side of the base includes IC36a and IC37.
a. Such a first shielding wall 71
Is useful for preventing the reproduction / recording circuit block (read / write 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 is provided with the IC 36b and the IC 37
b. Such a second shielding wall
Numeral 72 serves to prevent the reproduction / recording circuit block and the positioning circuit block of the digital circuit unit from interfering with each other, as in the case of the first shielding wall 71. In other words, the first and second shielding walls 71 and 72 are configured so that the analog circuit section and the digital circuit section are separated in individual functional blocks. In such a configuration, it can be ensured that electromagnetic shielding is more fully realized than in the third preferred embodiment shown in FIG.

FIG. 13 is a diagram showing a fifth preferred embodiment of the configuration of the disk drive 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 81 and the second shielding wall 82 have the form of ribs, respectively, and are formed inside the base 22 and the cover 23. At the disk 24. More specifically, the first and second shielding wall portions 81 and 82 are formed along the boundary of the region, and the magnetic head 27 cooperates in the region. In such a configuration, the magnetic disk 27 and the IC 35a constituting the first stage amplifier circuit are likely to be affected by various electric 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 drive according to the present invention. More specifically, the fourteenth
The figure is a sectional front view showing a 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 double 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 and 90b-2 face the inner wall surfaces of the base 22 and the cover 23, and form the entire ground patterns 90c-1 and 90c-2.
Face the lower and upper surfaces of disk 24.

Further, in FIG. 14, the ICs 36a and 37a
Are assembled on the circuit pattern 90b-1 of the flexible printed circuit board 90 and are adhered 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 are tightly adhered to the inner wall of the cover 23. Heat dissipating fins 22Ba and 23Ba are formed on the surfaces of the base 22 and the cover 23. For the heat dissipating fins 22Ba and 23Ba, IC
The heat generated by 36a-39a can be effectively dissipated out of housing 21 through base 22 and cover 23.

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

Further, a portion 90A of the flexible printed circuit board 90 disposed near the magnetic head 27 is an IC.
The part where 35a is mounted is shown. With respect to the part 90A, the circuit pattern 90b-1 is formed on the surface on the opposite side to the surface of the other part of the circuit pattern 90b-1 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 via the IC 35a is further shortened, so that the reproduced signal (read signal) is less affected by disturbances such as electric noise.

FIG. 15, FIG. 16, FIG. 17, FIG. 18 and FIG.
FIG. 16 is a diagram showing a seventh preferred embodiment of the disk drive according to the present invention. More specifically, FIG. 15 is a perspective view showing the inside of the magnetic disk drive in a see-through manner, FIG. 16 is an exploded perspective view showing the configuration of FIG. 15 in more detail, and FIG. III
18 is an enlarged perspective view showing a portion surrounded by a circle A in FIG. 16, and FIG. 19 is a sectional view taken along a line III in FIG.
It is the expansion perspective view which looked at the part enclosed with the circle B in the figure from the direction of arrow V.

In these figures, 40-1 indicates the IC 37a
1 shows a first printed circuit board element, preferably a flexible printed circuit board, on which is 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, reference numerals of other ICs except for the ICs 37a and 37b (hereinafter, referred to as such) are omitted to simplify the description of FIGS. 15 to 19.

Further, the first printed circuit board element 40-1
Has two tongue portions 21-3 and 21-4 projecting outside one side 21-1 of a pair of long sides 21-1 and 21-2 located along the longitudinal direction, and the other Side 21-2
And one tongue 21-5 which projects further outward. Further, the first printed circuit board element 40-1 has one tongue 21-7 projecting outward from its short side 21-6. A plurality of terminals 22-1, 22-2, 22-3 and 22-4 are formed on the tongues 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 periphery. Further, the first peripheral portion 2A-2 includes 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, the peripheral portion 2A
-2 upper surface 2A-2a has a flat surface.

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

In FIG. 18, the tongue portions 21-3, 21
-4, 21-5, and 21-7 are configured to be raised once along the first peripheral portion 2A-2, and further bent outward. Furthermore, the 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
A-2e. The terminals 22-1 to 22-4, that is, the first group of terminals are arranged so as to be exposed on the upper surface 2A-2a of the first peripheral portion 2A-2.

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

Further, the second printed circuit board element 40-2
Has two tongue portions 20-3 and 20-4 projecting outside one side 20-1 of a pair of long sides 20-1 and 20-2 located along the longitudinal direction, and the other Side 20-2
And one tongue 20-5 projecting more outward. In addition, the second printed circuit board element 40-2 has one tongue 20-7 projecting outside its short side 20-6. A plurality of terminals 23-1, 23-2, 23-3 and 23-4 are formed on the tongues 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 periphery. Further, the second peripheral portion 3A-2 includes 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, the peripheral portion 3A
-2 has a flat surface.

Further, in the same manner as in the configuration relating to the first peripheral portion 2A-2, the upper flat surface 3 of the peripheral 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 tongues 20-3, 20-4, 20-5 and 20
-7 is configured to rise once along the second peripheral portion 3A-2 and be bent outward. Furthermore, the tongues 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 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 configuration, the spindle 25,
The magnetic disk 24, at least one magnetic head 27, at least one arm 28, actuator 29, etc.
Has been implemented. The cover 23 is disposed at a predetermined position on the base 22 so that the base 22 is covered with the cover 23. Furthermore, 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 periphery thereof using an anisotropic conductive adhesive 32.

When the cover 23 is connected to the base 22 as described above, the second tongue 20-
3, 20-4, 20-5 and 20-7 are the base 22
Of the first group 21-3, 21-4, 21-5, and 21-7, and the terminals 23-1 to 23-4 of the second group.
Respectively face the terminals 22-1 to 22-4 of the first group. Therefore, as exemplified in FIG.
The second tongues 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, while being arranged to be accommodated in the first tongues 21-3, 21-4, 21-.
5 and 21-7 are shallow recesses 3A-
2b, 3A-2c, 3A-2d, and 3A-2e. In such an arrangement,
The second tongues 20-3, 20-4, 20-5 and 20-7 and the first
The tongues 21-3, 21-4, 21-5 and 21-7 are firmly connected 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 corresponding shallow recesses 2A-2b, 3A-3b, etc., respectively, whereby the tongues 20-3, 21-3 can be retained.
Etc. do not adversely affect the respective fixing surfaces of the cover 23 and the base 22. Therefore, the first and second peripheral portions 2A-2 and 3A-2 are so arranged that the first peripheral portion 2A-2 is substantially completely adhered to the second peripheral portion 3A-2 over the entire circumference. Are fixed to each other.

Further, as exemplified in FIG. 19, the anisotropic conductive adhesive 32 has a property of being electrically conductive in the Z-axis direction. That is, anisotropic conductive adhesive 32
Is pressed between the two tongues in this direction, while having no electrically conductive properties in the directions of the X and Y axes. Therefore, the terminals 23-
1 and the corresponding terminal 22-1 of the base 22 can be electrically connected to each other. Furthermore, the other terminals 23 of the cover 23
-2, 23-3 and 23-4 can be electrically connected, and the 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 periphery of the peripheral 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 respective tongues of the base 22 and the cover 23 with the anisotropic conductive adhesive 32, or alternatively, the peripheral parts 2A-2 and 3A-2 and the tongue can be used. It is also possible to partially cover the portion 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. Thus, in a 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 becomes relatively simple. In addition, all tongues are held in their respective shallow recesses, so that base 22 and cover
23 can be tightly connected to each other by an anisotropic conductive adhesive 32 over the entire circumference. Thus, the seventh preferred embodiment has the further advantage that a sufficiently closed state can be ensured in the housing 21.

FIG. 20 is a view showing a modified example of the accommodation portion for the tongue in the seventh preferred embodiment of FIG. In FIG. 20, the structure inside the housing 21 is simply illustrated for simplifying the description.

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

FIG. 21 is a view showing another modification of the accommodating portion of the tongue in the seventh preferred embodiment of FIG. 21st
In the figure, 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 portion 3A-2 of the cover 23 as a receiving portion for the tongue portion, unlike the configuration of FIG. Further, in FIG. 21, each tongue of the base 22 and the cover 23
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 with 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 state.

FIG. 22 shows an eighth embodiment of the disk drive according to the present invention.
FIG. 3 is a diagram showing a preferred embodiment of the present invention. 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 pressing a metal plate are
Flange 2B around base 22 and cover 23
a, 3Ba. Further, in FIG. 22, each tongue of the flexible printed circuit board elements 40-1 and 40-2 is shown.
21-3 and 20-3 are coated with an anisotropic conductive adhesive 32 and held between the two flanges 2Ba and 3Ba. Finally, the base 22 and the cover 23 are
By applying a pressure F to Ba and 3Ba, they are fixed to each other and adhered to each other.

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

As shown in FIG. 23, the base 22 and the cover 23 manufactured by pressing a metal plate are
Another flange 2 around the base 22 and the cover 23
Ca, 3Ca. Here, the dimension of the overhang of one flange 2Ca is the same as that of the other flange 2Ca.
It is twice as long as the dimension of the overhang of Ca. First, the flexible printed circuit board elements 40-1, 40-2
The tongue portions 21-3 and 20-3 are coated with an anisotropic conductive adhesive 32 and held between the two flange portions 2Ca and 3Ca. Next, as shown in FIG. 23, the former flange portion 2Ca is folded so that the latter flange portion 2Ca covers the latter flange portion 3Ca, and the bent portion 2Ca is formed.
-1 is formed above the flange portion 2Ca. Lastly, the base 22 and the cover 23 are bonded 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 has become. In such a configuration, the fitting and bonding of the flange portions are performed at the same time, and the electronic components such as the ICs 37a and 37b can be firmly sealed in the housing 21 with high reliability.

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

In these figures, as in all the other embodiments described above, preferably 48 mm, ie 1.8.
One magnetic disk 24 having a diameter of 9 inches, a disk drive means 15, a magnetic head 27, a head assembly (head mechanism) including an actuator 29, an electronic circuit, and a printed circuit board such as 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 dimensions as the outside dimensions of a PCMCIA Type II IC memory card. In this figure, the connector is omitted.

Further, 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 encapsulated parts described above can move, includes the remaining space. A filler 16 having a shape corresponding to the unevenness is provided. Preferably, the filler 16 is made of a resin material such as a polycarbonate resin or an epoxy resin.

In such a configuration, the space that is not occupied can be reduced to a minimum necessary size. Therefore, deformation of the housing 21 that may be caused by the application of various external forces can be easily prevented, and undesired vibration of components enclosed in the housing 21 can also be prevented.

FIG. 26 shows an eleventh embodiment of the disk drive according to the present invention.
FIG. 2 is a sectional view showing a preferred embodiment of the present invention. In FIG. 26, the housing relating to the features of the eleventh preferred embodiment
The structure of the main part inside 21 is depicted.

The configuration of the eleventh preferred embodiment is similar to the configuration 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 section 14a and an upper printed circuit board section 14b, and the lower printed circuit board section 14a and the upper printed circuit board section 14b are made of a 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.

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

Also, in such a configuration of the eleventh preferred embodiment similar to the configuration of the tenth preferred embodiment,
The deformation of the housing 21 can be reliably prevented by the effect of the filler 16. Here, both printed circuit board parts
14a, 14b are usually located closest to the magnetic head, so that these printed circuit board parts 14a, 14b
Electromagnetic noise leaks from a and 14b. As a result, such electromagnetic noise may be superimposed on the read / record signal (write / read signal), and the signal / noise ratio (S / N ratio) may decrease. However, the second
In the eleventh preferred embodiment, the magnetic material 16-1 behaves so as to electromagnetically shield electromagnetic noise, so that a decrease in the signal / noise ratio (SN ratio) can be prevented.

FIG. 27 shows a twelfth embodiment of the disk drive according to the present invention.
FIG. 2 is a sectional view showing a preferred embodiment of the present invention. FIG. 27 also shows a housing related to the features of the twelfth preferred embodiment.
Only the structure of the main part inside 21 is depicted.

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

In the twelfth preferred embodiment, similarly to the eleventh preferred embodiment, the deformation of the housing 21 can be reliably prevented by the effect of the conductive filler 16-2. Further, in the configuration of the twelfth preferred embodiment, the conductive filler is also provided in the same manner as in the eleventh preferred embodiment.
16-2 also acts to electromagnetically shield the electromagnetic noise, so that it is possible to prevent a decrease in the signal / noise ratio (SN ratio).

FIG. 28 shows a thirteenth embodiment of the disk drive according to the present invention.
FIG. 2 is a sectional view showing a preferred embodiment of the present invention. Also in FIG. 28, the main part of the housing 21 is illustrated.

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 sealed in the elastic adhesive film 16-3 is provided in the above-mentioned space of the housing 21. In such a configuration, the filler 16 can be favorably fitted to the base 22, the cover 23, and the members enclosed in the housing 21 by the effect of the elastic adhesive film 16-3. Therefore, the thirteenth preferred embodiment has an advantage that the vibration of the filler 16 generated during the operation of the disk drive can be completely prevented.

FIG. 29 is a sectional view of a disk drive according to the present invention.
FIG. 2 is a sectional view showing a preferred embodiment of the present invention. FIG. 29 also shows the main part of the housing 21.

In FIG. 29, at least one signal lead wire 14-1 corresponds to a predetermined position of the lower and upper printed circuit boards 14a and 14b, as described in FIG. Buried in filler 16. Further, the filler 16 is disposed in the above-mentioned space, similarly to the thirteenth preferred embodiment. In such a configuration, similarly to the tenth preferred embodiment described in FIG. 25, the deformation of the housing 21 that may be caused by the application of an external force can be easily prevented. further,
Wiring connection individually required in the lower printed circuit board portion 14a or the upper printed circuit board portion 14b and 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 show a fifteenth preferred embodiment of the disk drive according to the present invention. Specifically, FIG. 30 is an exploded perspective view schematically showing an essential configuration, FIG. 31 is an enlarged sectional view schematically showing an essential configuration, and FIG. 32 is a disk drive in more detail. FIG. 33 is an exploded perspective view showing the apparatus, FIG. 33 is a perspective view showing the inside of the disk apparatus, and FIG. 34 is an enlarged sectional view showing the main part of the disk apparatus in more detail.

As shown in these figures, in the fifteenth preferred embodiment, the disk device 20 comprises a base 22 and a cover 23 as in the other embodiments described above.
Approximately 8 similar to PCMCIA Type II IC memory cards
It has a single rectangular thin housing 21 with 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 to a height of 4 to 5 mm by drawing into the shape of a container. Typically, the height of the base 22 is 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 opening, and therefore, if such a base 22 and the cover 23 are combined together, The overall height, that is, the thickness dimension of the rectangular housing 21 is 5 mm.

Now, the reason why the base height and the cover height are changed will be described. As described above, PCMCIA-
According to the Type II standard, both sides of the long side are provided as insertion guides for the host computer.
Limited to mm. Since this portion covers the outer diameter of the disk, 1.89 inches, or 48 mm in diameter, the disk is preferably located in the center of its thickness. Further, in correspondence with this disk arrangement, a half-moon-shaped relief as shown in FIG. 48 (A) described later is required for the base and the cover.
This complicated drawing reduces the area of the flange surface,
Decreases the strength of the base or cover and the strength of both. In order to avoid this, the height of the base and the cover were shifted to secure a thinner flange surface. Since the maximum height of the electronic components mounted on the inner wall of the base / cover is also substantially the same on the base side and the cover side, it is desirable to arrange the disk at the center of the housing thickness.

Further, on one of the short sides of the rectangular housing 21, a space for fixing the connector 42 is provided. 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, the base 22 and the cover
The connecting flanges 12-1 and 12-2 extending outward are provided at the outer peripheral portion of the 23.

As in the previous embodiment, for example the first preferred embodiment shown in FIGS. 3 to 9, the rectangular housing 21 comprises at least one magnetic disk 24, a spindle motor 26, at least 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
It has. Here, the detailed description of the disk device other than the coupling flanges 12-1 and 12-2 will be omitted to clarify the features of the fifteenth preferred embodiment.

As typically shown in FIG. 32, the base
22 is coupled to the cover 23 by overlapping the corresponding coupling flanges 12-1 and 12-2 of the base 22 and the cover 23, respectively. Further, such connecting flanges 12-1 and 12-2 are provided if the base 22 and the cover
When both 23 are made of iron, they are seamed together, preferably by spot welding. Alternatively, if seam welding is performed in which spot welding is performed continuously, a certain degree of sealing is also guaranteed. If the base and cover are made of a metal or resin material other than iron, these connecting flanges are joined by means such as crimping, screwing, riveting, and the like. Of course, for ferrous metals,
Needless to say, the connection by such means is possible.
If both the base 22 and the cover 23 are made of aluminum or made of a resin material, these connecting flanges 12-1, 12-2 are preferably joined by screws or rivets. It is fixed. Further, the joined flanges 12-1, 12
A frame constituted by a pair of L-shaped frame elements 13a and 13b is added to the outer peripheral portion of 12-2, and the jointed flanges 12-1 and 12-2 are pressed and tightly sealed. ing. Each of these L-shaped frame elements 13a and 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 FIGS.
The cross section has a concave portion corresponding to the outer shape of 12-2. At this time, the L-shaped frame elements 13a, 13b are bonded by using an adhesive, or the frame elements 13a, 13b
Can be secured to the spliced connecting flanges 12-1, 12-2 of the housing 21 and function as sealing means, thereby ensuring that the interior of the housing 21 remains sealed. .

With such a configuration, the mechanical strength of the housing 21 and the integrity of the housing 21 due to the connection of the connection flanges 12-1 and 12-2 as described above are remarkably improved. Further, since the L-shaped frame elements 13a and 13b act as buffer means against a mechanical shock caused by an external factor such as a drop of the disk device 20, it is possible to prevent deformation and damage of the housing 21. Become.

Furthermore, the disk device 20 is a PCMCIA Ty
Since it has the same size as the peII IC memory card, it can be compatible with the IC memory card currently used and can be connected to an external host device such as a host computer. In this case, since 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, the housing 21 can be easily inserted into the host computer.

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

The structure of the sixteenth embodiment is the same as the structure of the fifteenth embodiment described above. However, the structure of the sixteenth embodiment differs from the fifteenth 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 above-mentioned metal frame elements 33a and 33b is mounted directly on the associated connecting flanges 12-1 and 12-2 of the housing 21 and by applying a predetermined pressure to the metal frame elements 33a and 33b. Is finally fixed.

With such a structure, the frame 13 is attached to the connecting flanges 12-1 and 12-2 as in the fifteenth embodiment.
Is unnecessary. Therefore, the fixing process of the frame 13 is simplified as a whole, and the cost of assembling the disk device is reduced.

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

The structure of the seventeenth embodiment is the same as the structure of the sixteenth 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 formed of rubber frame elements 34a and 34b each having a recess.
This is different in that it has a double structure of being covered with a and 33b. In this case, first the rubber frame elements 34a and 34b are mounted on the combined flanges 12-1 and 12-2 by means of a gum containing an adhesive. The metal frame elements 33a and 33b are then attached directly to the rubber frame elements 34a and 34b. Finally, the metal frame elements 33a and 33b are firmly fixed to the rubber frame elements 34a and 34b and the connecting flanges 12-1 and 12-2 by applying a predetermined pressure to the metal frame elements 33a and 33b. Is done.

In the structure of the seventeenth embodiment, two types of frame elements that are separately mounted are required due to the double structure of the frame, and the steps of mounting the frames are the fifteenth and sixteenth steps. More than in the second embodiment. However, in the seventeenth embodiment, the degree of connection of the combined connecting flanges 12-1 and 12-2 is the same.
Higher than in the fifteenth and sixteenth embodiments, the mechanical shock caused by the drop of the disk drive is more effectively absorbed by the rubber frame elements 34a and 34b than in the previous embodiment.

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 portion of the combined connecting flanges 12-1 and 12-2.

FIG. 37 is a sectional view of an eighteenth embodiment of the disk drive structure according to the present invention. FIG. 37 also shows
Only the main parts of the structure inside the housing 21 relating to the features of the second embodiment are shown.

The structure of the eighteenth embodiment is the same as that of the seventeenth embodiment.
The structure is the same as that of the second embodiment. However, the structure of the eighteenth embodiment differs from the structure of the seventeenth embodiment in that the metal frame elements 33a and 33b
Are 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 mounted on the combined connecting flanges 12-1 and 12-2, and the combined flanges 12-1 and 12-2 on which the rubber frame elements 34a and 34b are combined. Is firmly pressed so as to contact the outside. The eighteenth embodiment described above has the same advantages as the seventeenth embodiment.

FIG. 38 is a diagram showing another example of a 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 using a pair of L-shaped frame elements have been described. However, it is also possible to use one 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 cover can be joined by this frame alone or by using a combination of frame and adhesive, without using welding, winding, screws, rivets, etc. as described in FIG. 32. It is.

As described above, in all the embodiments relating to the structure of the disk drive according to the present invention, when an excessively large external force is applied, the base cover is easily deformed because a relatively thin plate is used. It is desirable to use reinforcing studs in the thickness direction of at least one base 22 and cover 23. With the use of the reinforcing studs described above,
It is possible to sufficiently secure the mechanical strength of the housing 21 in the thickness direction even for an excessively large external force.

Further, in the above-described embodiment relating to the disk device structure according to the present invention, the embodiment for the magnetic disk device has been described. However, the present invention is also applicable to magneto-optical disks and optical disks.
Naturally, in all the embodiments described below, a magnetic optical disk device and an optical disk device can be used instead of the magnetic disk device.

The structure of the spindle of the disk drive according to the present invention will be described below with reference to FIGS. 39 to 49. The structure of the portion including the bearing means of the head actuator is also essentially the same as the structure described below, and therefore will not be described.

As described above, the disk device of the present invention has a very small thickness of 5 mm or less, and the base 22 and the cover 23 constituting the housing are as thin as 0.4 mm to 0.5 mm, most preferably. Is essentially weak against external force in the thickness direction because the steel plate is formed by pressing.
As described above, for example, the base /
Attempts to stud between the covers are attempted, but no such reinforcement can be applied to the area where the disc 24 resides and where the actuator moves. Therefore, it is preferable to implement a structure in which the center axis of the spindle and the center axis of the actuator are the outer ring rotating type having the fixed shaft 18 serving as the above-mentioned stud.

FIG. 42 is a view showing a preferred spindle structure of the present invention. The magnetic disk 24 is held by the spindle hub 11, and the spindle hub 11 further includes a bearing means.
It is supported on the fixed shaft 18 via 26-2. This fixed shaft 18
Is fixed to the base 22 by caulking. Other methods of fixing the fixed shaft to the base include welding, press fitting, bonding, and screwing, which will be described later. On the other hand, the spindle motor 26 has a rotor magnet 26-3 in a concave portion 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. No.
As shown in FIG. 49, the fixed shaft 18 has a portion for mounting a bearing,
It has a thin flange portion 18e at the lower portion and a caulking portion 18f at the lower portion. This caulking part 18f is used as base 22
Insert into the predetermined hole of the cold crimp (Cold Rivetting),
Alternatively, it is fixed to the base 22 by hot riveting.

The flange portion 18e of the fixed shaft 18 has the following two functions. The first function is that the fixed shaft is accurately erected perpendicularly to the base surface due to the presence of the flange. The second function is to serve as a reference plane for the bearing means. In the disk drive 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 becomes very short. The greater the distance between the upper and lower bearings, the better the disc tilt accuracy can be, but in the disk device of the present invention, as shown in FIG. 42, the upper and lower bearings are almost in contact, and Distance cannot be secured. Therefore, in the present invention, the fixed shaft
With the lower surface of the inner ring of the bearing abutting on this portion with the upper surface of the flange 18e of the 18 as a dimensional reference, good falling accuracy is ensured. To achieve this better,
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 set substantially 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 view for explaining the preload of the bearing means in FIG. In this case, the first and second bearing means can have substantially the same structure as one another.

As described above, the distance between the pair of bearings of the bearing means is extremely short due to the restriction on 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 extrapolated lines connect the points at which the rolling elements 26a contact the outer ring and the inner ring, respectively, and the distance between the two intersections at which the two extrapolated lines intersect the rotation center of the spindle. C is
By the preload means shown in the embodiment, the average distance S between the pair of bearings of the bearing means can be made longer. In FIG. 43, the distance C is about twice the average distance S, and therefore, about twice the moment stiffness can be 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. By adopting such a bearing configuration, it is possible to obtain longer accuracy than a conventional combination of bearings in which the upper and lower parts are separated. In addition, mounting on the fixed shaft 18 is as simple as inserting the hollow hole (inner diameter) of the integrated inner ring into the fixed shaft and bonding it, so that means for applying a preload and fixing to the fixed shaft 18 can be performed separately. 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. 42. It is. However, this method has the following problems. First,
In addition, it is difficult to machine flanges and the like because parts that constitute the bearing require high machining accuracy. Secondly, since bearing materials are required to have high hardness, assembly involving plastic deformation such as caulking is impossible. Therefore, in this case, means such as screwing or light press-fitting is used, 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. No. 42
The figure is a view for explaining the caulking and fixing, 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, a portion corresponding to the fixed shaft flange around the through hole is fixed from the lower surface of the base by laser spot welding.

In the third method, the lower surface of the base, that is, the lower end surface of the fixed shaft 18 is fixed by spot welding without providing a through-hole in the base 22 and without providing a base insertion portion in the fixed shaft 18. I do.

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

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

FIG. 39 is a view showing a second embodiment of the fixed shaft structure of the disk drive according to the present invention. In this embodiment, the substantially fixed shaft is a hollow shaft 26-1, which is fitted and adhered to a pin 15-1 fixed to the base 22 by caulking, and stands up 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 connected to the fixed shaft 26-1 by an adhesive. The cover 23 is fixed by bonding or spot welding. In FIG. 39, unlike FIG. 42, a pair of bearings 26-2 having an inner ring separated from each other is used as the bearing means without using a shaft-integrated bearing, and is adhered 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,
FIG. 40 representatively illustrates an enlarged schematic cross-sectional view of the fixed shaft structure of the spindle motor 26 as in FIG. 39.

The difference between the structure of the third preferred embodiment and the structure of the second preferred embodiment is that the two pins 15-1 and 15-
A single pin 15-3 having the shape shown in the figure is used in place of 2 and fixed to the base 22 by welding, while the cover 15 is fixed to the cover 23 by plastically deforming the pin 15-3. Is what you do.

More specifically, in the first stage, the pins 15-3 are pierced through the stepped holes in the base 22. In the next stage, 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 bonded is inserted and bonded to the pin 15-3. In the last stage, pins 15-3
Is fitted into the stepped portion of the cover 23 and the pin 15
The cover 23 is fixed by squeezing the head of No. -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,
FIG. 41 exemplarily shows an enlarged schematic cross-sectional view of the fixed shaft structure of the spindle motor 26 as in FIG. 39.

The structure of the fourth preferred embodiment is different 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 configuration is different from the configuration of the shaft-integrated bearing shown in FIG. 42, and is a configuration in which not only the inner ring but also the outer ring is integrated. . For this reason, it is not necessary to apply a preload and control accuracy at the stage of assembling the disk device, and the rotational 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 a fixed shaft 18
In that it is connected to the base 22 by means of the screw 43, and that the bearing means 26-2, which is not integral with the shaft, is directly bonded to the solid (solid) fixed shaft 18.

Next, the connection structure between the fixed shaft 18 and the cover 23 will be described.

FIG. 45 shows the internal structure of the housing with the cover 23 removed.
And a front end of the actuator fixed shaft 45.

FIG. 46 is a view showing a preferred embodiment in which the fixed shaft 18 of the disk device of the present invention described with reference to FIG. 42 is connected to the cover 23. In FIG. 46, the fixed shaft 18 and the base
Although the connecting portion of 22 is different from that of FIG. 42, the connection with the cover 23 is the same, so that it is considered that it will not hinder the use of the description. Further, the same applies to the connection between the fixed shaft 45 of the actuator and the cover 23, so that the description is 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 protrudes from the tip of the fixed shaft 18 above 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 a 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) has been. In addition, the insertion hole 22 provided in the base 22
A through hole 23b is formed in advance in a portion of the cover 23 facing c. In this embodiment, the inner diameter D ₁ of the through hole 23b is smaller than the outer diameter D of the stationary shaft 18, and the small diameter portion of the fixed shaft tip
The diameter d is larger than 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 come into contact with the lower surface 18c of the cover 23.
Further, since the length T ₁ from the bottom surface 18 a through the step portion 18 c is slightly larger than the distance L ₂ between the upper surface 22 b of the base 22 and the lower surface of the cover 23, the fixed shaft 18 is Acts to lift the peripheral portion of the through hole 23b 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 pressed in the form of a diaphragm by pressing down on the step 18c of the fixed shaft 18 so that the fixed shaft
It is configured to hold 18.

In this state, the adhesive 44 functioning as a fixing means and a sealing means is injected from above the cover 23 into the space between the through hole 23b and the small diameter portion 18d, whereby the cover 23 is It is bonded to the fixed shaft 18 by heat treatment or ultraviolet irradiation. Preferably, an epoxy elastic adhesive having a high viscosity and a low hardness after the 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, the adhesive 44 can be prevented from entering the cover 23 even when the adhesive 44 is injected into the through hole 23b. . Further, 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, so that 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 and the magnetic head 27 and damaging the surface thereof with the 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 downward, the cover 21 is firmly connected to the cover 23 in the thickness direction of the housing 21. Also, by using an elastic adhesive, the cover portion 23 is softly connected to the cover 23 in the in-plane direction. It is configured to be. With such a configuration, thermal stress and the like that can occur when the fixed shaft 18 is rigidly fixed to both the base 22 and the cover 23 in all directions can be reliably reduced.

More specifically, the cover 23 is mounted on the base 22 and further fixed by an adhesive, so that the upper part of the fixed shaft 18 can be securely fixed to the cover 23. In this case, the small-diameter portion 18d is fitted in the through hole 23b with an appropriate margin, so that the fixed shaft 18d
However, tilting can be prevented by fixing with screws as in the related art. Therefore, even an inexperienced person can relatively easily perform the work of mounting the cover 23 on the base 22. Further, the state where 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 predetermined positions by the fixed shaft 18. In this manner, 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 related art, and the demand for higher magnetic recording density can be satisfied.

Further, the above-described 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, a detailed description of the fixed shaft 45 is omitted here.
In summary, the fixed shaft 45 of the actuator together with the fixed shaft 18 stands upright on the base 22 without tilting. Therefore, the arm 28 can be prevented from tilting, and a 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 mounting structure of the shaft and the cover in the embodiment shown in FIG. In this example, the main part of the mounting structure of the shaft and the cover is shown in an enlarged manner.

In FIG. 47, in place of the adhesive 44, an elastic sealing member such as a rubber O-ring 44-1 is provided between the small diameter portion 18d of the fixed main shaft 18 and the through hole 23b of the cover 23. Placed in In this example, since the O-ring 44-1 has elasticity, the O-ring 44-1 is deformed into an elliptical shape by applying pressure on the O-ring 44-1 from the inside and the outside. . In this state, the O-ring 44-1 closely adheres to the outer periphery of the small diameter portion 18d and the inner periphery of the through hole 23b without any gap, and 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 with the dust.

As another embodiment of connecting the fixed shaft 18 to the cover 23 without tilting as shown in FIG. 46, there is a method by welding. For example, as shown in FIG. 43, the fixed shaft 18 (26-1) does not have a step on its upper end surface and does not make a through hole in the cover 23. With the base 22 and the cover 23 fastened, the upper end of the fixed shaft 18 contacts the cover 23. If 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. Since the welding of the cover 23 is the final stage of the assembly and the electronic components are housed inside, laser welding is preferable to electric welding. By doing so, the fixed shaft 18 and the cover 23 are securely fixed without applying a force in the falling direction to the fixed shaft 18.

A number of specific examples of the entire mechanism of the spindle motor of the disk drive 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 specific example of the entire mechanism of the spindle motor of the disk drive according to the present invention.

FIG. 50 shows the main part of the spindle motor mechanism relating to the features 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. One magnetic disk 24
Is configured to be rotatable.

[0187] A pair of first bearing means 26-2 (hereinafter, the first indication is omitted) is fixed around the spindle 25 to support the spindle 25.

Further, the spindle hub 11 has an outer edge for engaging the center opening of the magnetic disk 24, and is rotatably attached to the spindle 25 via 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 constituted by 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 into a concave portion provided on the bottom surface of the spindle hub 11, and is finally joined to the concave portion.

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

As another method, if a non-magnetic material is used as the spindle hub 11, the rotor magnet 26-3 is joined to the spindle hub 11 via another yoke.

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

Further, a stator coil 26-4 is fixed to an upper wall surface of the base 22 in the housing 21, so that the stator coil 26-4 is fixed to the rotor magnet through a certain axial gap. 26-3.

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

The base constituting a part of the housing 21
Numeral 22 is formed 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 protrude into a space between the stator coil 26-4 and the magnetic disk 24.

In the above configuration of the spindle motor, for example, a flat plate type motor and the rotor magnet 26
-3 and the stator coil 26-4, a surface-facing motor utilizing the axial magnetic flux of the spindle is formed, and the spindle hub 11 and the magnetic disk 24 are
In accordance with the rotation of the rotor magnet 26-3, it rotates integrally with the rotor magnet.

In such a case, the thickness of the spindle motor itself can be extremely small. By using a face-to-face (axial gap) motor,
As shown in the figure, it is possible to use the bearing almost superimposed on the inside of the motor, and to make the outer diameter of the motor smaller than the inner diameter of the disk, thereby realizing an apparatus with a thickness of 5 mm or less.

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 as compared with the conventional example. It is possible.

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

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

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

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

However, the second embodiment is different from the first embodiment in that the spindle hub 11, the base 22
And the cover 23 is made of a non-magnetic material.

In this case, the rotor magnet 26-3
In this method, the thickness is made thicker than the rotor magnet shown in FIG. 50, and a stator yoke on the cover side is used for a 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 remarkable characteristics as the first embodiment shown in FIG. 50 is obtained. It is what is done.

Further, 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, a bush 22-10 operating as another stator yoke is fixed to the base 22 by screws 22-11. Therefore, an effective magnetic flux is obtained.

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

In the 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 spindle hub 11, the base 22, and the cover 23 are made of a non-magnetic material, for example, aluminum or the like, and have a specific gravity smaller than that of a conventional soft magnetic material, The second embodiment is advantageous in that the moment of inertia of each of the rotating elements such as the spindle hub 11 and the rotor magnet 26-3 can be reduced.

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

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

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

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

However, the third embodiment is different from the first embodiment in that the two rotor magnets 11-1 and 11- magnetized in the same direction as the axial direction of the spindle 25.
2 is fixedly provided on the upper surface and the lower surface of the spindle hub 11, respectively.

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

On the other hand, the upper stator coil 26-4b is fixed to the lower wall surface of the cover 23, so that the upper stator coil 26-4b has an axial gap and has a certain axial gap. 2 and close to each other.

As described above, in the third embodiment, the two stator coils 26-4a and 26-4b, and the base 22 and the cover 23 which operate as the stator yoke are individually formed with the thickness of the spindle hub 11. With respect to the center in the direction, the upper and lower sides of the spindle hub 11 are arranged at positions symmetrical to each other.

Therefore, the two rotor magnets 11-
The two types of magnetic attractive 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.

Further, in the third specific example, 2
Since the two face-to-face motors are equivalent, a relatively large torque can be obtained.

Further, since the stator coil is divided into lower stator coil 26-4a and upper stator coil 26-4b, the two stator coils are connected to each other so that the stator coil is sufficiently activated when the motor is started. Large torque can be generated, while any one of the stator coils can be separated from the other stator coils, thereby reducing the back electromotive force during stable rotation of the motor. As a result, the magnetic disk can be rotated at a high speed.

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

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

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

However, the fourth embodiment is different from the second embodiment in that the rotor magnet 26-7 is constituted by an annular permanent magnet, and the inner peripheral edge thereof is not the spindle hub, but the rotor magnet 26-7. , And is rotatably held by the spindle 25 via the bearing means 26-2.

Further, the outer peripheral edge of the rotor magnet 26-7 is configured to fit into the center 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 such a shape as to be able to approach the rotor magnet 26-7 at as short an interval as possible. 23 operates as a stator yoke instead of the rotor yoke.

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

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

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

The structure 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 embodiment is different from the fourth embodiment in that the spindle hub 11 has a substantially annular shape, and has a plurality of portions in the axial direction of the spindle 25. The point is that it is divided.

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

Furthermore, 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 so as to have a thickness as short as possible and provided to face the cover 23 and the stator coil 26-4, respectively.

The fifth embodiment of the whole mechanism of the spindle motor is similar to that of the spindle motor mechanism in the other embodiments, because of the novel arrangement of the rotor magnets. It is possible to obtain a remarkable characteristic that a smaller size and lighter weight can be achieved as compared with the case of (1).

Further, the holding of the disk, which was difficult in the fourth embodiment, is facilitated by using a material which is easy to process, and a good disk height accuracy is obtained.

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

FIG. 55 shows a main part of the spindle motor mechanism, particularly a main part of a configuration 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 and the like are substantially the same as the first embodiment shown in FIG. Have a mutual relationship.

In the conventional configuration in which the magnetic disk is mounted, at least one magnetic disk 24 is fixed to the spindle hub 11 by means of a lock clamp disposed on the magnetic disk 24 by means such as screws. .

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

In such a configuration, the disk fixing structure is simpler than the conventional one, and some components such as conventional clamping means and screws are not required.

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

Therefore, the thickness of the housing 21 can be made smaller than that of the conventional one, and the overall size of the disk device can be made as compact as 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.

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

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

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

In such a case, if the magnetic disk 24 is bonded to the spindle hub 11 by an adhesive 47 such as a photo-curable adhesive, the above-described recess 47-1 is formed.
Are arranged so that a sufficient amount of adhesive 47 is filled, so that the adhesive force at the two adhesive surfaces is reduced.
It will be increased from what is shown in Figure 55.

In each of the disk fixing structures shown in FIGS. 55 and 56, the adhesive 47 is applied uniformly over the entire area of the adhesive surface between the spindle hub 11 and the magnetic disk 24. It is necessary that the adhesive 47 be uniformly cured by ultraviolet (UV) irradiation so as to be 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 photo-curing property and an anaerobic property that can be cured by ultraviolet (UV) irradiation simultaneously can be used. It is also possible to use other adhesives provided.

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

For example, the shape of the concave portion 47-1 may be a semicircle, a rectangle, or many other shapes.

Further, there are provided a plurality of the recesses each having various shapes as described above, the recesses being connected to each other to form a continuous groove shape as a whole. You may.

In this case, the above-mentioned concave portion is
Are preferably arranged so as to be distributed at equal intervals with respect to the peripheral direction.

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

Further, it is possible to uniformly disperse a plurality of recesses.

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

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

In a second step, a portion of the bonding surface where the above-mentioned imbalance to be corrected is present is determined by evaluating the direction of the imbalance (phase angle) and the amount of imbalance. .

In the third stage, as shown in FIG. 57, a required amount of the correction weight member 11a made of a photo-curable resin, a thermo-curable resin, or the like is typically attached to the magnetic disk. It is attached to the position specified above on the bonding 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 of the correction weight member 11a.

Finally, the unbalance phenomenon can be surely suppressed by the cured resin acting as the correcting means.

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 in FIG. 38 is emphasized by a dashed line.

In the disk device configuration of the present invention, the disk device is supported by the connector 42 quite firmly. However, there is necessarily a gap (play) between the frame acting as an insertion guide 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 a severe seek operation (movement of the head) is performed by frequently reading or writing data to or from a plurality of tracks, a reaction to the movement of the magnetic head causes the disk to move. The device also moves violently. As a result, there is a possibility that an abnormal sound is generated. In order to avoid such abnormal noise, it is necessary to minimize the play between the frame and the housing.

A method for substantially suppressing such backlash is described below.
As one measure, in FIG. 58, a projection 33-1 slightly protruding from a straight line of the entire outer shape is formed on a part of the frame 33 (shown enlarged by a dashed line).
Since the projection 33-1 is formed on only a part of the frame 33, the projection 33-1 can have the same function as 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, it is necessary that the position of the projection 33-1 be as outer as possible (opposite the insertion side) and that the frame 33 be as soft as possible with respect to the slot. . In order to further soften the frame 33, a slit 33-2 may be provided inside the projection 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-mentioned 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 a frictional force actually acts, the same effect can be obtained even if it is inserted in the up-down direction.

FIGS. 61 to 67 are views showing an example of the lock structure of the head mechanism in the disk drive according to the present invention. More specifically, FIG. 61 is a plan view schematically showing a lock structure of a head mechanism according to the present invention, and FIG. 62 is a partially enlarged view for explaining a seal structure between the inside of a housing and an arrangement area of a rod. FIG. 63 is a perspective view for explaining the insertion / removal operation of the disk device of the present invention with respect to a personal computer; FIG. 64 is a plan view showing in detail a second lock structure of the head mechanism of the present invention; FIG. 65 is a front view showing a second lock structure of the head mechanism portion of the present invention in a partial cross section, and FIGS. 66 (A), (B) and (C) show components directly related to the locking of the actuator. Plan view of the
FIGS. 67 (A) and (B) are a plan view and a front view showing the details of the rod structure in partial cross section, respectively.

Also in FIGS. 61 to 62, as in the case described above, one magnetic disk 24 mounted on the spindle fixed shaft 12 and the magnetic disk
A magnetic head 27 that records / reproduces information corresponding to 24
A support spring (not shown) and a head positioning actuator 29 supported via an arm 28 are arranged.

In the vicinity of the outer periphery of the magnetic disk 24, a load / unload member 54 for loading or unloading the magnetic disk 27 onto or from the magnetic disk 24, and the magnetic head 27 in the unloaded state. A stopper 53 for fixing the actuator 29 is disposed near the outside of the arm 28 at the time. A rod 52 having a coil spring 51 at one end and acting as a drive bar is provided on a side portion along the magnetic disk 24 and the actuator 29 so as to be movable in the length direction as indicated by an arrow. Has been established. In this case, the loading / unloading operation is performed by connecting the housing 21 of the disk device to an external host device.
When performing the operation of inserting / removing the slot 60-1 of FIG. 60 (FIG. 61), the operation is performed in conjunction with the insertion / removal operation.

The rod 52 with the above-described coil spring 51
A first lock lever 52a having a pad 56 functioning as a packing such as a rubber material for fixing a disk, and a second lock pressing the arm 28 against a stopper 53 so as to interlock with the movement in the length direction. Lever 52b and support shaft
57-1 and 57-2, respectively, and
The two protruding pins 55 are arranged so as to be engaged and connected to each other. More specifically, the rod 52 is installed inside a 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 beside the connector terminal 22-1. It is configured to protrude.

Further, on the outer surface of the housing 21,
An operating hole 58 for operating the rod 52 by pressing the other end thereof, and a connector terminal 22-1 to which data and control signals are transferred and power is supplied are provided. The disk device 20 thus configured includes a connector terminal 60-2 corresponding to the connector terminal 22-1 and the rod terminal 20-2.
An operation projection 59 for operating by pressing the other end of 52 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.

As shown in the partially enlarged sectional view of FIG. 62, the inside of the housing 21 and the area where the rod 52 is provided are provided with an O-ring 57a on a support shaft 57-2 for supporting the second lock lever 52a. Sealed by intervening. As a result, inside the housing 21, the outside air is shut off 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 connector terminal 60-2 on the -1 side is connected to the connector terminal 22-1 on the disk device 20 side. In addition, slot 60
The operating protrusion 59 on the -1 side causes the rod on the disk device 20 side to move.
The other end of 52 is pressed, and in conjunction with this pressing operation, the first lock lever 26 having a pad 56 that presses and fixes the disk 24, and the arm 28 is pressed against the stopper 53 to fix the actuator 29. The second lock lever 52L is released. This allows the disc 24 to rotate,
Further, the magnetic head 27 in an unloaded state is loaded on the load / unload member 54 onto the disk and becomes operable.

The disk device 20 is connected to the slot 60-
When the rod 52 is taken out from the inside, the rod 52 moves in the direction of the operating hole 58 by the bias of the coil spring 51, and in conjunction with this, the first lock lever 52a and the second lock lever 52b having the pad 56 are connected. It is turned. This allows the first lock lever
A pad 56 provided on 52a stops the rotation of the magnetic disk 24 to be in a locked state, and the head arm 28 supporting the magnetic head 27 is pressed against a stopper 53 by the second lock lever 52b. At the same time that the load / unload member 54 is unloaded, the actuator 29 is locked.

As a mechanism for setting the magnetic disk 24 and the actuator 29 in a locked state and an unlocked state, for example, as shown in FIG. 63, a card type magnetic disk device 20 is inserted into a slot 60-1 of a host computer 49.
When the lid 49a of the host computer 49 is closed in a state where the disk device 20 is inserted, the projection pin 49b is pressed to
By operating the rod 52 on the side, the magnetic disk 24 and the actuator 29 are locked, and when the lid 49a is opened, the pressed state of the projecting pin 49b is released to release the locked state. it can.

In this case, the host computer
An opening / closing lid that opens and closes in conjunction with the insertion / removal operation of the disk device 20 may be provided in the opening of the slot 60-1 of the 49. The above lock mechanism has a sealed structure in which the inside of the disk device is shut off from the outside air, and can be inserted into and removed from a device such as a host computer, and can be exchanged. The magnetic disk and the actuator can be locked / unlocked, so careless impact during handling or carrying is protected, and an IC memory card type disk device with high safety and reliability can be realized. Have the advantages.

Here, 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. Also 51
-4 indicates a pin. When the housing 21 of the disk device 20 is inserted into the host computer 49 or the like, the rod 52 (the second
For example, when the push lever 51-3 is pressed to move the operation lever 51-2, the actuator 29 is in a movable state. For this reason, the magnetic head 27 is in the loaded state, and the memory can be accessed. On the other hand, when the housing 21 is removed from the host computer,
The actuator 29 returns to the original position by the restoring force of the leaf spring 51-1 and the magnetic head 27 enters the unloaded state.

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

[0287] The rod 52 extends along the frame 33 from the portion of the connector 42 to a portion beside the actuator 29. One end of the rod protrudes into the groove for preventing incorrect insertion defined by the PCMCIA standard next to the connector, and the rod end is pushed down by being inserted into the PCMCIA standard slot. It is supposed to be. The rod 52 is provided with a partially arcuate undercut semicircular hole (see a sectional view taken along line LL in FIG. 67 (B)) in a resin mold part such as the frame 33. A hole formed by the peripheral portion (KK in FIG. 67 (B))
(See the cross-sectional view).

[0288] There is a partly cut hole on the side of the cover, and the operating lever extends 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 a magnetic circuit described later.
Is pressed against the connector 42 side. This rod
52 has a center of rotation beside the magnetic circuit, and its tip has a sickle-like shape, so that the actuator 29 is pressed and locked. When the rod 52 is in the released state, the preload of the leaf spring 51-1 shown in detail in FIG.
The magnetic head 27 is pressed so as to be 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 to turn the operating lever 51-2 in the unlocking direction. Incidentally, the load against the spring at the time of insertion is about 100 g, which is within a range that causes almost no trouble 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 very close to the rotating part of the actuator 29 (on the order of 0.1 mm), and may be in danger of contact. In order to avoid this danger, the distal end 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 front view showing a cross section of a first preferred embodiment of a spindle motor structure capable of reversely fixing a 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 attaching the disk to the stator coil side can be clearly understood.

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

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

Here, the reason for using the above-mentioned bonding ring 19 will be described.

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

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

The third reason is that, when the adhesive 19 'is an anaerobic adhesive, even if the adhesive 19' flows on the disk surface, the adhesive other than the bonding ring 19 on the disk surface is bonded. The agent 19 ′ does not harden due to contact with the outside air, so that the movement of the magnetic head 27 is not affected.

The fourth reason is that the disk 24 is not bonded to the spindle hub 11 and the disk inner diameter is bonded to the spindle hub 11, and the disk upper surface is bonded to the bonding ring 19 and the spindle hub 11 separately. Therefore, the height of the disk mounting can be managed with high accuracy.

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

In contrast to the method of bonding and 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 of the spindle hub 11 facing the stator coil 26-4 is A method in which the disk 24 is fixed is employed.

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

[0300] flange 62 is a sufficient thickness t ₂ so as not warp or the like occurs in the flange portion 62 at the time of cutting.

The magnetic disk 24 has a support surface for the flange portion 62.
It is supported by 62a, clamped by a clamper 63 press-fitted from the stator coil 26-4 side, 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. For this reason, the magnetic disk 24 is accurately fixed,
Reproduction is performed well.

The clamper 63 merely holds down 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-described structure, the upper surface of the base 22
Height H ₁₀ from 22i to the magnetic disk 24 can be made smaller than the case of the 42 views of the foregoing.

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 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 dimensions H _3. Therefore, the base
Height H ₁₁ between the 21 and the cover 23 corresponds to the sum of the height H ₃ of the height dimension H ₁₀ of the (H ₁₀ + H _3), the dimensions of the sum 42 It can be smaller than in the case of the figure. The magnetic disk device 20 of FIG. 68 is expected to be thinner than the case of FIG.

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

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

The present embodiment has a structure in which the clamper 63 in FIG. 68 is omitted to further reduce the thickness. In FIG. 69,
Components corresponding to those shown in FIG. 68 are denoted by the same reference numerals. Here, the spindle hub 11 has substantially the same structure as the spindle hub 11 in FIG. 68 except that the clamp margin 63a in FIG. 68 is eliminated. 62a. The magnetic disk 24 is fitted with the spindle hub 11, is adhered by an adhesive 61 in a state of being positioned in contact with the support surface 62a, and is accurately fixed.

[0308] Thus, the height H ₂₀ of the top surface 22i to the magnetic disk 24 of the base 22, than the height H ₁₀ corresponding in 68 view, only the height dimension of the clamp white 63a becomes smaller. That is, the height H ₂₁ between the base 22 and the cover 23, corresponds to the sum of the height H ₃ of the the above height _{H 20 (H 20 + H 3} ), the dimensions of this sum It is smaller than the height H ₁₁ in 68 FIG. This makes the magnetic disk device of FIG. 69 thinner than the magnetic disk device of FIG.

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

In the figure, the arm 28 is, as described above,
An arm tip 28-1 for holding the magnetic head 27 is provided at the tip thereof, and is disposed so as to be rotatable in the direction of arrow B about the second fixed shaft 45. A flat coil 67 is fixed to the portion. A pair of permanent magnets 29-5 and 29-6 are provided near the flat coil 67.
Is arranged. 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 on the side opposite to this edge portion is formed, for example, in consideration of the space utilization efficiency in the magnetic disk device. A lower yoke 29-2 having a wide width is provided to protrude into a corner shape so as to be disposed by utilizing a corner portion in the apparatus. On the other hand, a curved upper yoke 29-1 having a generally used width (for example, a width smaller than the lower yoke 29-2) is provided. These upper and lower yokes 29-1,
29-2 has side yokes 29 on both sides thereof at predetermined intervals.
-3 and 29-4 are magnetically connected. The pair of permanent magnets 29-5, 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 gap between the two to form a drive coil motor (DCM).

As described above, the actuator 29 of this embodiment is
In the magnetic circuit 67, the width of the central portion of the lower yoke 29-2 where the magnetic flux directly passes from one permanent magnet 29-5 to the adjacent permanent magnet 29-6 and increases in the magnetic flux density is increased. By increasing the cross-sectional area by increasing the area of the lower yoke 29-2, even if the lower yoke 29-2 and the upper yoke 29-1 are thinned, the magnetic flux saturation is 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.

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

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

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. The shape of the upper yoke 29-1 in
In the same manner as the shape of the lower yoke 29-2, the width of the central portion is formed in a wide shape by projecting in a corner shape.

According to the structure of this embodiment, the lower yoke 29-2 has the same concept as that of the embodiment of FIG. 70 described above.
The upper yoke 29-1 and the lower yoke 29-2 and the upper yoke 29-1
Since the cross-sectional area is increased by increasing the area of the lower yoke 29-2 and the upper yoke 29-1, the magnetic flux saturation is more effectively eliminated even if the thickness is reduced. As a result, a decrease in magnetic flux density in the air gap caused by magnetic flux leakage due to magnetic flux saturation is suppressed.

The first and second actuator structures
In any of the embodiments, even when the thickness of the lower yoke and the upper yoke constituting the magnetic circuit is reduced, 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 reduced. A decrease in the gap magnetic flux density due to leakage is suppressed. In addition, as in the first embodiment,
In the case where a wide portion is provided on one of the upper and lower yokes, if the magnet is bonded to one of the yokes, the wide portion should be provided on the yoke on which the magnet is provided. Generally, in the case of a one-sided magnet configuration,
In the gap, the magnetic flux near the yoke without the magnet tends to spread, so that the magnetic flux density at the center of the yoke is slightly lower. Further, in this case, if the yoke is made wider than necessary, the spread of the magnetic flux may be promoted, and the magnetic flux linked to the coil may be rather lowered.

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

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

In FIG. 74A, the yoke 68 is
It is composed of an upper member 68-1 and a lower member 68-2. Upper member
Each of the lower member 68-1 and the lower member 68-2 is formed by bending a plate 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 surfaces 68b and 68c formed by bending at right angles downward at both ends of the upper surface 68a,
And an upper end surface portion 68d formed by being bent at a right angle from a central portion of an outer peripheral 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 bending both ends of the lower surface portion 68e upward at right angles, and a lower surface portion. 68e has a protruding edge portion 68h protrudingly provided at the center of the outer circumferential edge of the outer edge 68e. The upper side surfaces 68b, 68
c, the lower side surfaces 68f and 68g, and the upper end surface 68d are all the same length. However, they may not all be the same, and for example, the lengths of the upper side surfaces 68b and 68c may be short enough not to protrude below the lower surface 68e.

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

The upper surface portions 68b and 68c and the lower surface portion 68
f and 68g are not parallel to each other.
b, 68c and the lower side surfaces 68f, 68g overlap each other, so that the horizontal direction (the direction parallel to the upper surface portion 68a).
Is positioned, and the lower surface portions 68f and 68g and the upper surface portion 68a
, The positioning in the vertical direction (height direction) is performed. By the contact between the upper end face 68d and the protruding edge 68h, both are supported so that their postures are stabilized. In this state, the upper surface 68a of the upper member 68-1 and the lower surface 68e of the lower member 68-2 face each other, and the upper surface 68b, the lower surface 68f, and the upper surface 68
The upper member 68-1 and the lower member are defined by c and the lower side surface portion 68g.
Magnetic paths MPa and MPb are formed between the yoke 68-2 and the magnetic path MP-2.

Therefore, the magnetic path MPa or MPb conventionally formed by a column member which is a separate component.
Are formed by the upper side portions 68b and 68c and the lower side portions 68f and 68g, and the number of components is reduced. In addition, since there is only one connection portion in each of the magnetic paths MPa and MPb, and since the facing area of each connection portion is large, the magnetic resistance in the connection portion is kept small and the overall magnetic resistance of the yoke portion 68 is made small. And the leakage magnetic flux at the connecting portion can be reduced, and a high magnetic flux density can be obtained at the movable portion.

The magnetic paths MPa and MPb are formed on the upper side surface 68.
Since the lower surface portions 68f and 68g and the lower surface portions 68f and 68g are formed so as to overlap 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 at those portions. I have. Therefore, for example, the yoke part
When a housing for housing 68 is made of a magnetic material and a part of the housing is arranged so as to be in contact with the upper surface portion 68a or the lower surface portion 68e, that portion of the housing is formed of the magnetic path MP of the yoke 68. Although the entire magnetic flux increases as a part, the magnetic flux can be passed through the magnetic paths MPa and MPb without being saturated, and the magnetic flux density of the movable portion can be increased. further,
The upper member 68-1 and the lower member 68-2 are separated from each other by an upper side surface portion 68b,
68c and the lower surface portions 68f, 68g overlap with the lower surface portion 68f,
Since the positioning is easily performed by the 68g and the contact of the upper surface portion 68a, there is no need to separately provide an extra positioning portion such as a dowel as in the related art. Therefore, processing and assembling of parts are extremely easy. In addition, the contact between the upper end surface 68d and the protruding edge 68h stabilizes the posture of both members and reduces the magnetic resistance. In order to integrate the upper member 68-1 and the lower member 68-2, an adhesive may be applied to a contact surface between the upper surface portions 68b, 68c and the lower surface portions 68f, 68g, or Alternatively, the housing for accommodating the yoke portion 68 may be integrated.

Further, as shown in FIGS. 75 (A) and (B), the head mechanism comprises an actuator 29, an arm 28 connected to and moving to the actuator 29, and an arm connected to the arm 28. The tip 28-1, the arm tip 28-
It is composed of a magnetic head 27 attached to the front end of the first magnetic head.

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

[0327] The arm supporting portion 17 which is rotationally driven in this manner has lower end portions 68f, 68f at its rotating end.
The inner side of g is in contact with the side edges 29d and 29e, whereby the driving range of the actuator 29 is restricted. 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 actuator 29 can generate a large torque, and can be suitably used as an actuator of a thin and thin magnetic disk device such as a card-type magnetic disk device.

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

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

In the yoke portion 168 shown in FIG. 76, the width of the upper side portions 168b, 168c and the lower side portions 168f, 168g is substantially half of the length of the edge of the upper surface portion 68a and the lower surface portion 68e. Is set.

As a result, the shape of the yoke portion 168 is reduced to reduce the occupied volume, and other mechanical parts and the like are arranged in the reduced width portions of the upper side portions 168b and 168c and the lower side portions 168f and 168g. Therefore, the size of the magnetic disk drive can be further reduced. In this case, although the width dimension of the upper side portions 168b, 168c and the lower side portions 168f, 168g is reduced, their thickness is twice that of the upper surface portion 68a and the lower surface portion 68e. 168b and 168c and the lower surface 16 unless
Only 8f and 168g portions are not magnetically saturated.

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

The lower member 69-2a of the yoke 69a shown in FIG. 77 (A) includes lower side surfaces 68f and 68g and a lower surface 68.
A lower end face portion 68k is formed continuously from e. Lower end
The 68k becomes a part of the magnetic path and also supports the upper member to stabilize its posture.

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

In the lower member 69-2c of the yoke 69c shown in FIG. 77 (C), a lower end surface 68n for a stopper is formed from the lower surface 68e to the inside of the lower side surface 68f. The lower end surface portion 68n is provided with an actuator instead of the side edge 29d described above.
It regulates the drive range of 29 and becomes 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 symmetrically fitted to each other to form lower side surfaces 68f, 68g and lower end surfaces 68k, 68.
1, 68m, 68n overlap, or simply the top 68
Various shapes can be selected, such as a shape consisting of a and the upper side surfaces 68b and 68c.

In the above-described embodiment, the upper member 68-1 and the lower member 68-2 may be either upper or lower.
The upper member 68-1 and the lower member 68-2 can be manufactured by various forming methods other than pressing. Magnet part
The number of the permanent magnets 29a may be only one.

According to the present invention, a yoke can be formed with a small number of parts, and a high magnetic flux density can be obtained in the movable portion by reducing the magnetic resistance. Further, the upper member and the lower member can be easily positioned relative to each other, and can be easily assembled.

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

FIGS. 79 to 81 show the detailed structure of an axial flux type spindle motor according to the present invention.
FIG. 79 is a perspective view of one constituent block, FIG. 80 is a sectional view taken along line IV-IV of FIG. 79, and FIG. 81 is a sectional view taken along line VV of FIG. 79 of one constituent block. Are respectively shown. Reference numeral 75 denotes 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 disposed 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 provided with the magnets 26 arranged in an annular shape.
-3 and the stator coil 26-4 are formed integrally with the rotor yoke 76. The distance between the magnetic path assisting means 75 and the stator yoke 77 is
-3 and the stator yoke 77 are configured to be narrower. Accordingly, during the rotation of the spindle motor 26, a closed magnetic path in the circumferential direction indicated by a broken line with an arrow is formed in FIG. 80, and the property of the magnetic path assisting means 75 as a magnetic material is further reduced in FIG. Accordingly, the leakage magnetic flux is captured, and a radial auxiliary closed magnetic path passing through the magnetic path auxiliary means 75 is formed. That is, when there is no magnetic path assisting means, the magnetic flux passing only through the circumferential closed magnetic path is dispersed to the radial auxiliary closed magnetic path, so that the magnetic flux density in the rotor yoke 76 and the stator yoke 77 is reduced, The leakage magnetic flux density due to the yoke saturation of the rotor yoke 76 and the stator yoke 77 is also reduced. Then, the gap magnetic flux density for rotating the rotor yoke 76 is increased as compared with the case where there is no magnetic path assisting means.

Therefore, even if the rotor yoke 76 and the stator yoke 77 are made thinner than before, the stator coil
The current flowing through 26-4 can be efficiently converted to torque. At the same time, it is possible to reduce the influence of the leakage magnetic flux density on a portion such as a head or a recording disk that handles a recording signal.

FIG. 82 is a cross-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, the same components as those of FIG. 78 are denoted by the same reference numerals, and the description thereof will be omitted. In the present embodiment, the magnetic path assisting means 75 is formed integrally with the stator yoke 77, and the same effect as in the examples shown in FIGS. 78 to 81 can be obtained by this configuration.

In addition to the above, although not shown, the magnetic path assisting means 75 is divided, each is formed integrally with the rotor yoke 76 and the stator yoke 77, and the divided magnetic path assisting means 75 is formed.
Can be obtained by facing each other.

[0345] In Fig. 78 and Fig. 82, the magnet 26- made of a plurality of annularly connected magnet elements is used.
The magnetic path assisting means 75 is provided so as to include the stator 26-4 comprising three and a plurality of coil elements from the inner and outer circumferences, but the magnetic path assisting means 75 is provided only on either the inner or outer circumference. Even if it is provided, the leakage magnetic flux density can be reduced as compared with the related art.

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 yoke saturation of the rotor yoke and the stator yoke, thereby reducing the current flowing through the coil. As well as reducing the influence of the leakage magnetic flux density on the part handling the recording signal such as the head or recording disk, making it easier to provide a smaller and thinner spindle motor than before. There is a feature that can be.

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

A magnetic disk device or an IC memory card used for a personal computer or the like is required to have high durability against not only the above-mentioned impact but also an external magnetic field. In an IC card or the like, it is required that there is no data abnormality 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 drive, it is necessary to keep the head and the medium part (disk) at 5 Gauss or less.

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

In order to minimize the influence of the external magnetic field, it is important that the magnetic head is retracted to the data zone when the power is off. Because magnetic heads have a large effect of concentrating magnetic flux, a magnetic field of the order of 10 gauss directly affects the data directly under the head, and at the order of 100 gauss there is even the possibility of data erasure, but there is no head This is because the disk medium alone does not erase even about 1000 Gauss. Considering that the effect of the disturbing magnetic field is particularly large when carrying a portable disk,
A mechanical retracting mechanism that does not rely on VCM (Voice Coil Motor) driving is essential.

In particular, in a magnetic disk device having a floating magnetic head, in order to avoid damage to the data zone during a CSS (Contact Start Stop) operation, a head for retracting the head to the parking zone when the disk is stopped. The retracting mechanism and the actuator lock mechanism for holding the retracted head are indispensable. On the other hand, CSS
Even in a device using a negative pressure slider (zero load slider) that does not perform an operation, a retracting / locking operation is necessary in consideration of a head colliding with a medium when an external impact is applied. Further, in an apparatus having an unloading mechanism, a mechanism for surely moving the head to the unloading position when the power is turned off and holding the head at that position is required.

The following is a typical example of the head retracting mechanism. That is, there are (1) a device using a return spring, (2) a device for retracting an actuator using a back electromotive force of a spindle motor, and (3) a device using gravity. The following are examples of the actuator lock mechanism. That is, there are (1) a device using a Larayette mechanism, (2) a device using a frictional force, and (3) a device using a magnetic force.

However, in the return spring of the normal head retraction mechanism (1), as long as a linear spring is used, the offset force changes depending on the position of the data zone, so that the influence on the control system is large and the return spring is opposite to the retraction zone. In the position (1), an excessive offset force is applied, which causes an increase in power consumption. Also, in the case of the retracting mechanism (2), there has been a problem that the induced power of the spindle motor is reduced due to the downsizing of the device, and a sufficient retracting force cannot be exerted. Furthermore, the gravity utilization of (3) is not applicable to the current mainstream balanced rotary actuator, and
Recent small devices cannot be used because the installation direction cannot be limited.

In the actuator lock mechanism,
In the case of (1), a solenoid for releasing or holding is required, and in the case of (2), there are disadvantages such as the setting is delicate. The method using the magnetic force of (3) is also a so-called magnet catch, and its effective range is limited to a position very close to the parking zone. The retracting mechanism using the return spring also has a locking ability, but the locking force is weaker than the retracting force unless a magnetic spring is used, and is not practical.

Therefore, in the present invention, a retracting mechanism using a magnet shown in FIGS. 83 to 84 is used. Here, the head mechanism has a rotary actuator 29 (for example, see FIG. 70), and the magnetic head 29 is retracted to the outer edge of the flat coil 86 of the actuator 29. And a retracting magnet 85 for performing the operation. Further, a retracting yoke 87 is arranged above and below the retracting magnet 85 to form a closed magnetic path. In the variable gap magnetic circuit constituted by the closed magnetic path, a state in which the gap magnetic flux density is always high is stable, so that a force for moving to the higher magnetic flux density side acts. Therefore, Fig. 83 ~
In the example of FIG. 84, the magnet 85 is in a tapered gap.
This is due to the force acting to move to the narrower gap. In this example, the more 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 realized by providing a step to narrow the gap rapidly. ing.

More specifically, the graph of FIG.
As shown in the gap change structure in FIG. 86, in the data zone, an arbitrary integration constant x ₀ is added to the moving distance x of the magnetic head.
The gap G in the magnetic circuit is set such that the gap value g is proportional to the reciprocal of the value x + x ₀ obtained by adding the step portion 87-1 in the yoke 87 so that the gap value g is sharply reduced in the lock region. Has formed. 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, for example, in the lock region of the outer portion of the magnetic disk, this torque increases rapidly, so that the magnetic head can be reliably locked. Done in

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

In general, there are several methods for calculating the magnetic attraction force. Here, the description will be made using the rate of change of magnetic energy, which is used most easily.

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 / 2φ ² R = 1/2 NIφ = 1/2 (NI) ² / R .

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

Here, a magnetic circuit model as shown in FIG. 87 is considered. In this case, the magnetic energy is in space, in the magnet,
Stored in the yoke. 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 reduced tangent B = 0 of intersection of磁曲line (linearized with coercive force) B _r: (residual magnetic flux density was linearized) the intersection of the tangent and H = 0 in the demagnetization curve at the operating point (B _r = μ _r H _e ) In this case, if the magnetic resistance in the yoke is ignored (assuming that there is no magnetic energy), the magnetic resistance R of this magnetic circuit is expressed by the following equation (1).

[0362]

(Equation 1)

[0366] 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)

As described 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. Also, to obtain a constant force regardless of the position x,
The relationship represented by the following equation (3) holds.

[0366]

(Equation 3)

[0367] In practice, it is difficult to manufacture such a function-shaped, by securing larger gap distance l _g with respect to the magnet thickness l _m, the almost constant torque in linear change Can occur.

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

FIG. 88 is a graph showing the result of actually measuring the torque in the head retracting mechanism of the variable gap type. According to the actual measurement results, an almost constant evacuation force is obtained within the entire stroke (entire rotation angle) of the magnetic head 27, and at the lock position on the right side of the graph, about 4 to 9 times the evacuation force. The torque is generated, and sufficient performance is obtained as a lock mechanism. The holding torque at the lock position increases as the magnet 87 is thicker (larger by 1 _m ), as is clear from the measurement results in FIG. 88 and the magnetic circuit model in FIG.

FIG. 89 is a perspective view showing an example of a head retracting mechanism of a variable area type. In FIG. 89, the area where the positioning magnet 85 and the positioning yoke 87 overlap in the plane between the positioning magnet 85 and the positioning coil 87 is changed in the direction in which the magnetic head 29 is displaced. The lever 29 is retracted. More specifically, the area where the magnet 85 and the yoke 87 overlap with each other is configured so as to increase linearly as it goes to the right, and another stepped portion 87- with respect to the plane direction of the yoke 87. 2, the width of the yoke 28 is sharply increased. In such a configuration,
Using the magnetic circuit model of FIG. 87 described above, it is possible to calculate the change in the retracting force with respect to the moving distance x. 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)

Thus, a constant force is obtained by the linear change of the area S ′. Further, in the lock region, the holding torque is increased by providing a step portion as in FIG. 85, so that the magnetic head is securely locked.

FIG. 90 is a diagram showing another example of a retracting mechanism of the magnetic head in the magnetic disk drive according to the present invention. Here, the magnet 85, which is a permanent magnet, is incorporated in a part of the yoke 87 of the fixed portion without installing the magnet 85 in the movable portion, and an iron piece, which is a soft magnetic material, is provided in the gap in the movable portion. ing. Even in this case, the same effect as in 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 retraction force, so that the design of the magnetic circuit becomes somewhat difficult. In this embodiment, the yoke 87 is made of sheet metal substantially concentric with the center of rotation, and has a central V-shaped or other shaped groove finished to a predetermined shape.

In each of the examples 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 in the locked position. , And a small and highly reliable magnetic disk drive can be realized. In these embodiments, the direction of the magnetic flux is the axial direction of the actuator pivot, but 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 of FIG. 91, components other than the housing are essentially the same as those of the other many embodiments, and therefore, portions other than the housing are omitted.

Here, the housing of the magnetic disk drive includes a lower flat base portion 122, an upper flat cover portion 123, and a frame-like frame portion 121 disposed on the horizontal portion.
It is composed of Further, the thickness of the frame part 121 is designed in advance so that a disk, a disk drive part, a head mechanism part and the like can be accommodated in the housing.

Further, the base portion 122 and the cover portion 123
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. Further, if a ferrous metal that is a magnetic material is used, the thickness of the entire apparatus can be further reduced by also using the yoke member of the spindle actuator motor. On the other hand, as a material of the frame portion 121 disposed so as to be sandwiched between the base portion 122 and the cover portion 123, aluminum or the like, which can be easily manufactured by die casting or the like, can be used.

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 a yoke for the spindle motor and the actuator motor, or can be used as an auxiliary yoke for the main yoke. There is also an effect of a magnetic shield. If 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 can be further obtained than when only the base portion 122 and the cover portion 123 are magnetic materials.

FIG. 92, FIG. 93, FIG. 94 and FIG.
1 is a diagram showing a most preferred example of a disk device having an overall structure in which one disk and two heads are incorporated in a housing according to the present invention. Specifically, FIG. 92 is a front sectional view of the entire structure, FIG. 93 is a perspective view showing a main part of the entire structure, FIG. 94 is an exploded perspective view of a printed circuit board, and FIG. 95 is various components. FIG.

As shown in these figures, the disk device comprises the following components as a whole. One disk with a diameter of 1.89 inches or less, a disk drive that rotates the disk, and read /
Two magnetic heads for performing writing, an arm for supporting the magnetic head, an actuator carriage for rotatably supporting the arm, a bearing for enabling the actuator carriage to rotate, an actuator for rotating the actuator carriage and a recording medium for rotating the actuator An actuator drive for moving to a predetermined position on a disk surface, a base and a cover which are combined with each other to form a housing (the housing includes at least a disk, a disk enclosure, a disk drive, a magnetic head, an actuator carriage , The bearing and the actuator drive), and at least the read / write operation by the disk drive, magnetic head and positioner drive.

In this case, the above circuit is constituted by a flexible printed circuit board built in the housing, and the height of the magnetic disk device is PCMCIA.
It is about 5mm compliant with Type II.

More specifically, in FIGS. 92 to 95, reference numeral 211 represents a base, 212 represents a cover, and 213 represents a cover.
Reference numerals a and 213b denote 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 FIG. 32, it is made of an iron-based metal. This provides an excellent magnetic shielding effect as described above. The lower side of each of the fixed shafts 213a and 213b is the same as that shown in FIG. 42.
Fixed to 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, on a fixed shaft 213b on the actuator side, an actuator 230 including a magnetic head 232 and an arm 238 is rotatably held within a predetermined angle range. This actuator 230 has the magnetic head 232
It can be moved to the desired track on 222 and positioned there.

Reference numeral 251 is a flexible circuit board. The single flexible circuit board 251 is attached to the base 21 with an appropriate adhesive or the like as described in detail in FIG.
1 and the inner surface of the cover 212 are adhered and fixed. On the printed circuit board 251, a group of electronic circuit components 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.) are arranged in a circuit of a digital group. And an analog group circuit. In addition, the printed circuit board 25
1 is connected to a connector 217 supported by a base 211 and a cover 212. Further, when the connector 217 is connected to a plug-in portion of an external electronic device (for example, a portable notebook computer), the magnetic disk device shown in FIGS. 92 to 95 functions 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
The 221 supports the disk 222 by bonding. Further, the magnet 224 is fixed in the spindle hub 221 by bonding. This 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, reference numeral 227a is an upper bearing of the disk, and 227b is a lower bearing thereof. 228 is the upper bearing 227a
And 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 a 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 are a plurality of coils 225,
Each coil is formed concentrically on a flexible substrate,
Also, the coils are equally divided and arranged. The brushless magnetic circuit includes 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) from each coil 225 is connected to a corresponding terminal on the printed circuit board 251 by soldering, and 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 back bearing of the actuator 230, and 225b is an upper bearing thereof. 236 is a rear bearing 235a and an upper bearing 235b
Is a spacer for maintaining a certain gap between the spacers. 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.

[0389] Further, the arm 238 is connected to the block 231 from the axial direction by laser spot welding. The two magnetic heads 232 are joined and fixed to one end of each arm 238, respectively. The two magnetic heads 232 oppose both surfaces of the magnetic recording medium 222, respectively. Further, the coil 233 for driving the actuator 230 is provided with an arm.
It is located on the opposite side to 238, and blocks 23
Fixed 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 a flexible printed circuit board 251 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 represented by VC shown in FIG.
M (Voice Coil Motor)
Is composed of an upper yoke 241, a lower yoke 242, side yokes 243 a and 243 b and a magnet 244 forming a magnetic circuit 240, and respective coils 233 arranged in the magnetic circuit 240. When a current flows through these coils 233, actuator 230 rotates.

In this case, the magnetic head 232 uses a contact-type integrated magnetic head for performing perpendicular magnetic recording disclosed in Japanese Patent Application Laid-Open No. 3-178017 to reduce the load and reduce the voltage. . However, if a load / unload mechanism is employed, a normal magnetic head, that is, a head which performs horizontal magnetic recording and has 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 end and the lower end of the housing except for the vicinity of the shaft and the actuator.

For this reason, various circuits can be incorporated in the space, so that the space can be effectively used in the housing.

Also, in the embodiment shown in FIGS. 92 to 95, the external dimensions of the disk device are PCMCIA or JMC.
It conforms to the dimensions of the specification of the IC memory card conforming to the standard specification of EIDA. 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 can be reduced. Equivalent to an IC memory card,
Furthermore, if the interface specifications are the same, compatibility with an IC memory card can be provided.

Consequently, according to the one-disk magnetic disk drive of the present invention, the storage capacity can be increased to 40 MByte or more while the height is reduced to 5 mm or less.

[Brief description of the drawings]

FIG. 1 is a diagram (part 1) illustrating an example of a disk device according to the related art.

FIG. 2 is a diagram (part 2) illustrating an example of a disk device according to the related art.

FIG. 3 is a diagram (part 1) illustrating a first preferred embodiment of a disk drive according to the present invention;

FIG. 4 is a diagram (part 2) showing a first preferred embodiment of the disk drive according to the present invention;

FIG. 5 is a diagram (part 3) showing a first preferred embodiment of the disk drive according to the present invention;

FIG. 6 is a diagram (part 4) showing a first preferred embodiment of the disk drive according to the present invention;

FIG. 7 is a diagram (part 5) showing a first preferred embodiment of the disk drive according to the present invention;

FIG. 8 is a diagram (part 6) showing the first preferred embodiment of the disk drive according to the present invention;

FIG. 9 is a view showing a disk drive according to a first preferred embodiment of the present invention (part 7);

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

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

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

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

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

FIG. 15 is a diagram (part 1) showing a seventh preferred embodiment of the disk drive according to the present invention;

FIG. 16 is a diagram (part 2) showing a seventh preferred embodiment of the disk drive according to the present invention;

FIG. 17 is a diagram (part 3) illustrating a seventh preferred embodiment of the disk drive according to the present invention;

FIG. 18 is a view (part 4) showing a seventh preferred embodiment of the disk drive according to the present invention;

FIG. 19 is a view (No. 5) showing a seventh preferred embodiment of the disk drive 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. 17;

FIG. 21 is a view showing another modified example of the tongue-shaped enclosure portion of the seventh preferred embodiment of FIG. 17;

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

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

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

FIG. 25 is a diagram (part 2) showing a tenth preferred embodiment of the disk drive according to the present invention;

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

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

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

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

FIG. 30 is a diagram (part 1) of a fifteenth preferred embodiment of the disk drive according to the present invention;

FIG. 31 is a diagram (part 2) of the fifteenth preferred embodiment of the disk drive according to the present invention;

FIG. 32 is a diagram (part 3) of the fifteenth preferred embodiment of the disk drive according to the present invention;

FIG. 33 is a view showing a fifteenth preferred embodiment of the disk drive according to the present invention (part 4);

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

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

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

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

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

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

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

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

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

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

FIG. 44 is a diagram (part 1) illustrating a fourth preferred embodiment of the fixed shaft structure of the disk device according to the present invention;

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

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

FIG. 47 is a view showing a modification of the mounting structure of the shaft and the cover according to the fourth preferred embodiment of FIG. 46;

FIG. 48 is a view (part 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 (part 2) showing a fifth preferred embodiment of the fixed shaft structure of the disk device according to the present invention;

FIG. 50 is a view showing a first preferred embodiment of the entire structure of a spindle motor of a disk drive according to the present invention.

FIG. 51 is a view showing a second preferred embodiment of the entire structure of the spindle motor of the disk drive according to the present invention.

FIG. 52 is a view showing a third preferred embodiment of the entire structure of the spindle motor of the disk drive according to the present invention.

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

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

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

FIG. 56 is a view showing a modification of the disk fixing structure of the sixth preferred embodiment of FIG. 55.

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

FIG. 58 is a diagram showing a first modified example 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 diagram (part 1) illustrating an example of a lock structure of a head mechanism in a disk device according to the present invention.

FIG. 62 is a diagram (part 2) illustrating an example of a lock structure of a head mechanism in a disk device according to the present invention.

FIG. 63 is a view (part 3) illustrating an example of a lock structure of a head mechanism section in a disk drive according to the present invention.

FIG. 64 is a diagram (part 4) illustrating an example of a lock structure of a head mechanism in a disk device according to the present invention.

FIG. 65 is a diagram (part 5) illustrating an example of a lock structure of a head mechanism unit in a disk device according to the present invention.

FIG. 66 is a view (part 6) illustrating an example of a lock structure of a head mechanism in a disk device according to the present invention.

FIG. 67 is a diagram (part 7) illustrating an example of a lock structure of a head mechanism in a disk device according to the present invention.

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

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

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

FIG. 71 is a diagram (part 1) illustrating a second preferred embodiment of the actuator structure in the disk drive according to the present invention;

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

FIG. 73 is a view (part 3) showing a second preferred embodiment of the actuator structure in the disk drive according to the present invention;

FIG. 74 is a diagram (part 1) illustrating a third preferred embodiment of the actuator structure in the disk drive according to the present invention;

FIG. 75 is a view showing a third preferred embodiment of the actuator structure in the disk drive according to the present invention (part 2);

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

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

FIG. 78 is a diagram (part 1) illustrating an improved example of the first preferred embodiment of the overall structure of the spindle motor as in FIG. 50;

FIG. 79 is a diagram (part 2) illustrating an improved example of the first preferred embodiment of the overall structure of the spindle motor as in FIG. 50;

FIG. 80 is a diagram (part 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 view (part 4) showing an improved example of the first preferred embodiment of the overall structure of the spindle motor as in FIG. 50;

FIG. 82 shows another improved example of the first preferred embodiment of the overall structure of the spindle motor as in FIG. 50;

FIG. 83 is a diagram (part 1) illustrating a preferred embodiment of a head retracting structure in a disk device according to the present invention;

FIG. 84 is a diagram (part 2) illustrating a preferred embodiment of a head retracting structure in the disk device according to the present invention.

FIG. 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. 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 results of actually measuring the torque in the head retracting mechanism of the variable gap type.

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

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

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

FIG. 92 is a diagram (part 1) illustrating an example of a disk device having an overall structure in which one disk and two heads are incorporated in a housing according to the present invention.

FIG. 93 is a view (part 2) showing one example of a disk device having an overall structure in which one disk and two heads are incorporated in a housing according to the present invention;

FIG. 94 is a diagram (part 3) illustrating an example of a disk device having an overall structure in which one disk and two heads are incorporated in a housing according to the present invention.

FIG. 95 is a diagram (part 4) illustrating an example of a disk device having an entire structure in which one disk and two heads are incorporated in a housing according to the present invention.

[Explanation of symbols]

 DESCRIPTION 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 ... anisotropic conductive adhesive 36 ... read / write circuit 38 ... control circuit 39 ... interface circuit 40 ... flexible printed circuit board 45 ... second fixing Shaft 65 ... Magnetic circuit 67 ... Flat coil 68 ... Yoke part 85 ... Magnet for positioning 87 ... Yoke for positioning

 ──────────────────────────────────────────────────続 き Continuation of the front page (31) Priority claim number Japanese Patent Application No. 4-5433 (32) Priority date January 16, 1992 (1992.1.16) (33) Priority claim country Japan (JP) (31) Priority claim number Japanese Patent Application No. 4-53177 (32) Priority date March 12, 1992 (1992.3.12) (33) Priority claim country Japan (JP) (31) Priority claim number Japanese Patent Application No. 4-61704 (32) Priority date March 18, 1992 (192.3.18) (33) Priority claiming country Japan (JP) (31) Priority claim number Japanese Patent Application No. 4-63640 ( 32) Priority date March 19, 1992 (192.3.19) (33) Priority claiming country Japan (JP) (31) Priority claim number Japanese Patent Application No. 4-115771 (32) Priority date 1992 May 8 (1992.5.8) (33) Priority claiming country Japan (JP) (31) Priority claim number Japanese Patent Application No. 4-171372 (32) Priority date June 30, 1992 (1992. 6.30) (33) Excellent Claiming country Japan (JP) (31) Priority claim number Japanese Patent Application No. 4-211149 (32) Priority date August 7, 1992 (8.7.1992) (33) Priority claiming country Japan (JP) (72) Inventor Yasumasa Kurobane 1015 Uedanaka, Nakahara-ku, Kawasaki City, Kanagawa Prefecture Inside Fujitsu Limited (72) Inventor Toru Kohei 1015 Kamikodanaka, Nakahara-ku, Kawasaki City, Kanagawa Prefecture Inside Fujitsu Limited (72) Inventor Takao Sugawara Kanagawa Fujitsu Co., Ltd. (72) Inventor Yu Matsumoto 1015 Ueodanaka, Nakahara-ku, Kawasaki City, Kanagawa Prefecture Inside Fujitsu Co., Ltd. (72) Hiroyuki Mase 1015, Ueodanaka, Nakahara-ku, Kawasaki City, Kanagawa Prefecture Address Fujitsu Limited (72) Inventor Masao Tsunekawa 1015 Uedanaka, Nakahara-ku, Kawasaki City, Kanagawa Prefecture Inside Fujitsu Limited (72) Inventor Shinji Koganezawa 1015 Kamiodanaka, Nakahara-ku, Kawasaki City, Kanagawa Prefecture Fujitsu Limited (72) Inventor Keiji Ariga 1015 Kamiodanaka, Nakahara-ku, Kawasaki-shi, Kanagawa Fuji F-term (for reference) within Toru Corporation 5D075 AA03

Claims (2)

[Claims] 1. A disk drive for inserting into a slot formed in an external device, said slot comprising:
The disk device has a size capable of receiving a C memory card, the disk device includes a housing including a base and a cover, and at least one connector fixed to the outside of the housing. Inside, a disk for storing information, a disk drive unit including a spindle motor for rotating the disk, a head mechanism unit for writing and reading information to and from the disk, and an electronic device including at least an interface circuit A spindle motor; a pair of first bearing means for rotatably supporting the disk, and a first bearing means for fixing the first bearing means at a predetermined position in the housing. A first fixed shaft, wherein the first fixed shaft is fitted in the base and fixed by caulking. The at least one connector is connected to the electronic circuit, and an overall outer dimension including the housing and the at least one connector is compatible with an IC memory card standardized by PCMCIA-ATA. A disk device characterized by the above-mentioned. 2. The disk device according to claim 1, wherein the base and the cover forming the housing are formed by press-forming an iron-based metal.