JP3715434B2 - Magnetic disk drive and assembly method thereof - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a magnetic disk device, and more particularly, to a magnetic disk device including a carriage assembly as a rotary actuator.
[0002]
[Prior art]
In recent years, in electronic devices such as personal computers, magnetic disk devices have been widely used as large-capacity memory devices. Generally, a magnetic disk device includes a magnetic disk disposed in a case, a spindle motor that supports and rotationally drives the magnetic disk, a carriage assembly that supports a magnetic head, a voice coil motor that drives the carriage assembly, and a substrate. It comprises a unit and the like.
[0003]
The carriage assembly includes a bearing portion attached to the case, a plurality of arms extending from the bearing portion, and a suspension extending from each arm, and the magnetic head is attached to the extending end of the suspension. The magnetic head can be moved to an arbitrary track on the magnetic disk by rotating the carriage assembly, and the carriage assembly and the voice coil motor function as a rotary actuator.
[0004]
When assembling the magnetic disk device having the above-described configuration, the magnetic disk is usually assembled in a later process as much as possible in order to prevent dust from being attached or scratched. That is, in the assembly process, first, a carriage assembly on which a magnetic head is mounted, a voice coil motor, a spindle motor, and the like are assembled in a case, and finally a magnetic disk is assembled in the case and attached to the spindle motor. When the magnetic disk is assembled, the carriage assembly is held at a position shifted from the magnetic disk assembly area to the outer peripheral side so as not to interfere.
[0005]
Conventionally, such a carriage assembly holding process is performed using a dedicated head standby jig. That is, the head standby jig is formed in a pin shape, for example. Then, this head standby jig is inserted into a dedicated hole formed in the top yoke of the voice coil motor, and its tip is engaged with a side surface of the coil holding frame provided in the carriage assembly or a dedicated hole. As a result, the carriage assembly is held so as not to rotate to the magnetic disk built-in area side. In this state, the magnetic disk is assembled in the case and attached to the spindle motor. Thereafter, the head standby jig is removed to release the carriage assembly.
[0006]
Subsequently, the carriage assembly is rotated to the magnetic disk side around the bearing portion, and the magnetic head is loaded on the surface of the magnetic disk using a dedicated head loading jig. The carriage assembly is rotated until it moves to the peripheral area. After that, by attaching an outer peripheral stopper to the case, the coil holding frame of the carriage assembly comes into contact with the outer peripheral stopper even when the carriage assembly is moved to the maximum outer peripheral side of the magnetic disk. It will not move outward beyond the outer periphery.
[0007]
[Problems to be solved by the invention]
However, in the magnetic disk apparatus having the above-described configuration, a dedicated head standby jig is required to hold the carriage assembly outside the magnetic head assembly area during assembly, and the standby jig is inserted into the top yoke. It is necessary to form a dedicated hole for this purpose. This results in an increase in manufacturing cost and a decrease in manufacturing efficiency.
[0008]
The present invention has been made in view of the above points, and an object of the present invention is to hold the carriage assembly in a standby position at a predetermined position without using a dedicated jig and without processing extra holes or the like in the constituent members. An object of the present invention is to provide a magnetic disk device that can reduce the manufacturing cost and improve the manufacturing efficiency, and an assembling method thereof.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, a magnetic disk device according to the present invention includes a case having a bottom wall, a magnetic disk accommodated in the case, and fixed to the bottom wall to support and rotate the magnetic disk. A spindle motor, a magnetic head for recording / reproducing information with respect to the magnetic disk, and a support unit fixed to the bottom wall are rotatably provided, and the magnetic head is attached to the magnetic disk. A carriage assembly movably supported, a voice coil held by a holding frame extending from the support, and a yoke attached to the bottom wall and facing the voice coil, the carriage assembly And a voice coil motor that positions the magnetic head at an arbitrary position on the magnetic disk, and a predetermined bottom wall Removably attached to the location, and a, a stopper for restricting the rotation of the carriage assembly.
[0010]
The holding frame of the carriage assembly engages with the stopper to hold the carriage assembly at the retracted position when the carriage assembly is at the retracted position outside the outer peripheral edge of the magnetic disk. When the carriage assembly is rotated to the outermost peripheral position where the magnetic head is positioned on the outermost peripheral edge of the magnetic disk in a state where the joint portion and the magnetic head are positioned on the magnetic disk, A second engagement portion that abuts and restricts the carriage assembly from rotating beyond the outermost peripheral position to the outside;
It is characterized by having.
[0011]
According to the magnetic disk apparatus of the present invention, the holding frame is positioned substantially coaxially with the first and second side surfaces extending radially with respect to the support portion and the first and second sides. An outer peripheral surface extending between the side surfaces,
The first side surface is located between the center of the magnetic disk and the second side surface to form the first engagement portion, and the second engagement portion is adjacent to the first side surface. And it has the recess formed in the said outer peripheral surface, It is characterized by the above-mentioned.
[0012]
Further, in the assembling method of the present invention for assembling the magnetic disk device having the above-described structure, the spindle motor, the carriage assembly supporting the magnetic head, and the voice coil motor are attached to the bottom wall of the case.
The carriage assembly is rotated to a retracted position outside the area where the magnetic disk is mounted,
The stopper is attached to a predetermined position of the bottom wall and engaged with the carriage assembly, the carriage assembly is held in the retracted position,
The magnetic disk is assembled in the case and attached to the spindle motor,
Remove the stopper to release the carriage assembly,
The released carriage assembly is rotated toward the magnetic disk attached to the spindle motor, and the magnetic head is disposed on the magnetic disk.
The stopper is attached to the predetermined position of the bottom wall.
[0013]
According to the magnetic disk apparatus and the method of assembling the same configured as described above, a single stopper can be used to temporarily fix the carriage assembly and to regulate the rotation of the carriage assembly in the operating state. . Therefore, it is not necessary to prepare a dedicated jig for temporarily fixing the carriage assembly at the retracted position during assembly. Further, since the stopper is attached to and detached from a predetermined single predetermined position, it is not necessary to form a dedicated hole or engaging portion used for temporarily fixing the carriage assembly in the yoke or the like. Therefore, it is possible to reduce the manufacturing cost and improve the assembly efficiency.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment in which the present invention is applied to a hard disk drive (hereinafter referred to as HDD) will be described in detail with reference to the drawings.
As shown in FIG. 1, the HDD has a rectangular box-shaped case 12 with an upper surface opened, and a top cover (not shown) that is screwed to the case with a plurality of screws to close the upper end opening of the case. .
[0015]
In the case 12, there are three magnetic disks 16 as magnetic recording media, a spindle motor 18 as a driving means for supporting and rotating the magnetic disks, and a plurality of magnetic heads for writing and reading information on the magnetic disks. A substrate assembly 21 having a carriage assembly 22 that supports these magnetic heads movably with respect to the magnetic disk 16, a voice coil motor (hereinafter referred to as VCM) 24 that rotates and positions the carriage assembly, a head IC, and the like. It is stored.
[0016]
The case 12 has a rectangular bottom wall 12a, and a printed circuit board (not shown) for controlling the operation of the spindle motor 18, the VCM 24, and the magnetic head is screwed to the outer surface of the bottom wall via the board unit 21. Has been.
[0017]
The magnetic disk 16 is formed with a diameter of 65 mm (2.5 inches) and has magnetic recording layers on the upper surface and the lower surface. The magnetic disk 16 is coaxially fitted to a hub (not shown) of the spindle motor 18 and is clamped by a clamp spring 17 to be rotated at a predetermined speed.
[0018]
As shown in FIGS. 1 and 2, the carriage assembly 22 includes a bearing assembly 26 fixed on the bottom wall 12 a of the case 12. The bearing assembly 26 that functions as a support portion includes a pivot 27 that is erected vertically with respect to the bottom wall of the case 12, a cylindrical hub 28 that is rotatably supported on the pivot via a pair of bearings, have. The carriage assembly 22 includes two arms 32 and one spacer ring attached to the hub 28, and a magnetic head assembly 36 supported by each arm.
[0019]
The arm 32 is formed of a stainless steel material such as SUS304 in a flat plate shape having a plate thickness of about 250 μm, and a through hole (not shown) is formed at one end, that is, the base end.
[0020]
Each magnetic head assembly 36 includes an elongated plate-like suspension 38 that can be elastically deformed, and a magnetic head 40 that is fixed to the tip of the suspension. The suspension 38 is configured by a leaf spring, and the base end thereof is fixed to the distal end of the arm 32 by spot welding or adhesion, and extends from the arm.
[0021]
Each magnetic head 40 has a substantially rectangular slider and a recording / reproducing MR (magnetic resistance) head formed on the slider, and is fixed to the tip of the suspension 38 via a gimbal portion (not shown). .
[0022]
The fixed arm 32 of the magnetic head assembly 36 is fitted to the outer periphery of the hub in a stacked state by inserting the hub 28 of the bearing assembly 26 into the through hole at the base end. The spacer ring is fitted to the outer periphery of the hub 28 while being sandwiched between the arms. As a result, the two arms 32 are positioned parallel to each other at a predetermined interval and extend from the hub 28 in the same direction.
[0023]
The carriage assembly 22 described above prevents the arms 32 and the suspension 38 from overlapping the magnetic disk 16 when the magnetic head 40 is rotated to the retracted position indicated by the solid line in FIG. That is, it is formed so as not to overlap the magnetic disk in the axial direction of the magnetic disk.
[0024]
The carriage assembly 22 has a holding frame 44 extending from one spacer ring in the direction opposite to the arm 32, and supports the voice coil 45 constituting a part of the VCM 24 by this holding frame. The holding frame 44 is integrally formed on the outer periphery of the voice coil 45 with synthetic resin, and is fixed to the spacer ring via the mounting portion 50. Note that a connector 52 having a terminal connected to the voice coil 45 is formed integrally with the mounting portion 50.
[0025]
2 and 4, the holding frame 44 has first and second side surfaces 44a and 44b extending radially with respect to the bearing assembly 26, and a substantially arc shape substantially coaxial with the bearing assembly. And an outer peripheral surface 44c formed and extending between the first and second side surfaces. The first side surface 44a is located between the second side surface 44b and the center of the magnetic disk 16, and constitutes a first engaging portion in the present invention. Further, a shallow recess 54 is formed in the outer peripheral surface 44c in the vicinity of the first side surface 44a. The recess 54 functions as a second engagement portion in the present invention.
[0026]
As shown in FIG. 1, the magnetic disk 16 is positioned between the two arms 32 in a state in which the carriage assembly 22 configured as described above is incorporated in the case 12. The magnetic head 40 attached to the suspension 38 is opposed to the upper surface and the lower surface of the magnetic disk 16 and sandwiches the magnetic disk 16 from both sides. A predetermined head load is applied to each magnetic head 40 toward the surface of the magnetic disk by the spring force of the suspension 38.
[0027]
A lower yoke 48a is fixed on the bottom wall 12a of the case 12, and a top yoke 48b is disposed opposite to the lower yoke at a predetermined interval. The voice coil 45 fixed to the holding frame 44 of the carriage assembly 22 is positioned between the lower yoke 48a and the top yoke 48b, and constitutes the VCM 24 together with the magnet 46 fixed on the lower yoke. When the voice coil 45 is energized, the carriage assembly 22 rotates around the bearing assembly 26 and the magnetic head 40 is moved and positioned on a desired track of the magnetic disk 16.
[0028]
As shown in FIGS. 1 and 4, a stopper 60 that restricts the rotation of the carriage assembly 22 is detachably attached to the bottom wall 12 a of the case 12. That is, an engagement hole 62 is formed at a predetermined position on the bottom wall 12 a of the case 12. The stopper 60 is formed in a pin shape by rubber, synthetic resin, metal, or the like, for example. The stopper 60 is detachably fitted into the engagement hole 62 and is erected substantially vertically on the bottom wall 12a. The portions of the lower yoke 48a and the top yoke 48b that face the engagement holes 62 are cut away, and the stopper 60 can be attached and detached even when these yokes are attached to the case 12.
[0029]
As shown in FIGS. 1 and 3, the stopper 60 is connected to the first side surface 44 a of the holding frame 44 in the operating state of the carriage assembly 22, that is, in the state where the magnetic head 40 is positioned on the magnetic disk 16. It is located between the outer peripheral edge of the magnetic disk 16. When the carriage assembly 22 rotates to the outermost peripheral position shown in FIG. 1 and the magnetic head 40 moves to the outer peripheral edge on the magnetic disk 16, the first side surface 44 a of the holding frame 44 contacts the stopper 60. Accordingly, the stopper 60 restricts the carriage assembly 22 from rotating beyond the outermost peripheral position and prevents the magnetic head 40 from coming off the surface of the magnetic disk 16.
[0030]
On the other hand, the board unit 21 has a plurality of electronic components and connectors (not shown), and is connected to the carriage assembly 22 via a flexible printed circuit board (not shown).
[0031]
According to the HDD configured as described above, as shown in FIG. 1, the magnetic head 40 moves onto a desired track of the magnetic disk 16 by rotating the carriage assembly 22 by the VCM 24 during normal operation. Then, information is recorded on or reproduced from the magnetic disk.
[0032]
Next, a method for assembling the HDD configured as described above will be described.
First, the spindle motor 18, the substrate unit 21, and the lower yoke 48a are assembled and fixed to the bottom wall 12a of the case 12. Further, the bearing assembly 26 of the carriage assembly 22 that supports the magnetic head 40 is fixed to the bottom wall 12a, the carriage assembly 22 is assembled into the case 12, and then the top yoke 48b is assembled.
[0033]
Subsequently, as shown in FIG. 5, the carriage assembly 22 is rotated to the retracted position shown by the solid line in FIG. In this retracted position, the carriage assembly 22 is located outside the mounting area of the magnetic disk 16, and the recess 54 of the holding frame 44 is an engagement hole 62 formed in the bottom wall 12 a of the case 12. And is aligned with.
[0034]
In this state, the stopper 60 is fitted into the engagement hole 62 and engaged with the recess 54 of the holding frame 44. Therefore, the rotation of the carriage assembly 22 is restricted by the stopper 60 and is held at the retracted position.
[0035]
Thereafter, the magnetic disk 16 is assembled in the case 12 and fixed to the hub of the spindle motor 18. At this time, since the carriage assembly 22 is held at the retracted position, the magnetic disk 16 can be assembled easily and smoothly without obstructing the carriage assembly.
[0036]
Subsequently, the stopper 60 is removed from the case 12, and the holding of the carriage assembly 22 is released. Thereby, the carriage assembly 22 can be rotated. The carriage assembly 22 is rotated toward the magnetic disk 16 attached to the spindle motor 18, and the magnetic head 40 is loaded on the surface of the magnetic disk using a head loading jig (not shown). Rotates the carriage assembly until it is positioned in the innermost peripheral area of the magnetic disk.
[0037]
After the magnetic head 40 is thus arranged on the magnetic disk 16, the stopper 60 is fitted into the engagement hole 62 of the bottom wall 12a as shown in FIGS. Thereafter, the flexible printed board of the board unit 21 is connected to the carriage assembly 22, and a top cover not shown is screwed to the case 12. Thereby, the assembly of the HDD is completed.
[0038]
According to the HDD configured as described above, the single stopper 60 can be used to temporarily fix the carriage assembly 22 during assembly and to restrict the rotation of the carriage assembly in the operating state. Therefore, it is not necessary to prepare a dedicated jig for temporarily fixing the carriage assembly 22 to the retracted position during assembly. Further, since the stopper 60 is detached from the engaging hole 62 formed at a predetermined position, it is necessary to form a dedicated hole or engaging portion used for temporarily fixing the carriage assembly 22 in the case, the yoke or the like. Disappear. Therefore, it is possible to reduce the manufacturing cost and improve the assembly efficiency.
[0039]
The present invention is not limited to the above-described embodiment, and various modifications can be made within the scope of the present invention. For example, the number of magnetic disks, the number of magnetic heads corresponding thereto, the number of arms, etc. can be increased or decreased as necessary, and the number of ramps of the ramp load mechanism is increased as the number of magnetic heads increases. Further, the shape of the stopper and the shapes of the first and second engaging portions can be modified as necessary. Furthermore, the attachment / detachment attachment of the stopper is not limited to the combination of the hole and the pin, but may be, for example, screwing or the like, and the attachment position of the stopper is not limited to the case bottom wall but may be a lower yoke.
[0040]
【The invention's effect】
As described above in detail, according to the present invention, by using a single stopper as a carriage assembly temporary fixing member and a carriage assembly rotation restricting member, the manufacturing cost can be reduced and the manufacturing efficiency can be improved. It is possible to provide a magnetic disk device that can be used and an assembly method thereof.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view showing an HDD according to an embodiment of the present invention.
FIG. 2 is a plan view of a carriage assembly provided in the HDD.
FIG. 3 is a plan view of the HDD.
FIG. 4 is an exploded perspective view showing a part of a holding frame of the carriage assembly and a stopper.
FIG. 5 is a plan view showing a state in which the carriage assembly is temporarily fixed at a retracted position when the HDD is assembled.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 12 ... Case 12a ... Bottom wall 16 ... Magnetic disk 18 ... Spindle motor 22 ... Carriage assembly 24 ... Voice coil motor 26 ... Bearing assembly 32 ... Arm 38 ... Suspension 40 ... Magnetic head 44 ... Holding frame 44a ... 1st side surface 44b ... Second side surface 44c ... outer peripheral surface 45 ... voice coil 48a ... lower yoke 48b ... top yoke 54 ... recess 60 ... stopper 62 ... engagement hole 70 ... lamp 72 ... guide surface

Claims (6)

A case having a bottom wall;
A magnetic disk housed in the case;
A spindle motor fixed to the bottom wall and supporting and rotating the magnetic disk;
A magnetic head for recording and reproducing information on the magnetic disk;
A carriage assembly that is rotatably provided around a support portion fixed to the bottom wall and supports the magnetic head movably with respect to the magnetic disk;
A voice coil held by a holding frame extending from the support portion; and a yoke attached to the bottom wall and opposed to the voice coil, and rotating the carriage assembly to move the magnetic head to the magnetic head. A voice coil motor that is positioned at an arbitrary position on the disk, and a stopper that is detachably attached to a predetermined position of the bottom wall, and that restricts rotation of the carriage assembly,
The holding frame of the carriage assembly is a first engaging portion that engages with the stopper to hold the carriage assembly at the retracted position when the carriage assembly is at the retracted position that is outside the outer peripheral edge of the magnetic disk. When,
In a state where the magnetic head is positioned on the magnetic disk, when the carriage assembly is rotated to the outermost peripheral position positioned on the outermost peripheral edge of the magnetic disk, the magnetic head contacts the stopper, A second engaging part for restricting the carriage assembly from rotating beyond the outermost peripheral position to the outside;
A magnetic disk drive comprising: The holding frame includes first and second side surfaces extending radially with respect to the support portion, and an outer peripheral surface positioned substantially coaxially with the support portion and extending between the first and second side surfaces. Have
The first side surface is located between the center of the magnetic disk and the second side surface to form the first engagement portion, and
2. The magnetic disk drive according to claim 1, wherein the second engaging portion has a recess formed in the outer peripheral surface adjacent to the first side surface. The stopper is formed in a pin shape,
The bottom wall of the case has an engagement hole in which the stopper is detachably fitted,
The engagement hole is located between the first side surface of the holding frame and the outer peripheral edge of the magnetic disk when the magnetic head is located on the magnetic disk. The magnetic disk device according to 1. The said recess formed in the outer peripheral surface of the said holding frame is provided in the position which aligns with the said engagement hole, when the said carriage assembly moves to the said retracted position. Magnetic disk unit. A case having a bottom wall;
A magnetic disk housed in the case;
A spindle motor fixed to the bottom wall and supporting and rotating the magnetic disk;
A magnetic head for recording and reproducing information on the magnetic disk;
A carriage assembly rotatably provided around a support portion fixed to the bottom wall and supporting the magnetic head movably with respect to the magnetic disk;
A voice coil held by a holding frame extending from the support portion; and a yoke attached to the bottom wall and opposed to the voice coil, and rotating the carriage assembly to move the magnetic head to the magnetic head. A voice coil motor for positioning at an arbitrary position on the disk and a detachable attachment at a predetermined position on the bottom wall, and the carriage assembly is moved to the outermost peripheral position where the magnetic head is positioned on the outermost peripheral edge of the magnetic disk. A stopper that abuts against the holding frame when rotating and restricts the carriage assembly from rotating beyond the outermost peripheral position;
In a method for assembling a magnetic disk drive comprising:
The spindle motor, a carriage assembly supporting the magnetic head, and the voice coil motor are attached to the bottom wall of the case,
The carriage assembly is rotated to a retracted position outside the area where the magnetic disk is mounted,
The stopper is attached to a predetermined position of the bottom wall and engaged with the carriage assembly, the carriage assembly is held in the retracted position,
The magnetic disk is assembled in the case and attached to the spindle motor,
Remove the stopper to release the carriage assembly,
The released carriage assembly is rotated toward the magnetic disk attached to the spindle motor, and the magnetic head is disposed on the magnetic disk.
A method of assembling a magnetic disk drive, wherein the stopper is attached to the predetermined position on the bottom wall. The holding frame of the carriage assembly includes first and second side surfaces that extend radially with respect to the support portion, and an outer peripheral surface that is positioned substantially coaxially with the support portion and extends between the first and second side surfaces. And a recess formed in the outer peripheral surface adjacent to the first side surface,
6. The method of assembling a magnetic disk device according to claim 5, wherein a pin-like stopper is attached to a predetermined position of the bottom wall and engaged with the recess of the carriage assembly rotated to the retracted position.

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