JP2002300746A - Motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stably hold each soldered portion of land parts 16a of a flexible circuit board 16 in each slot of thrust poles 14a with a simple structure. SOLUTION: A free end side of each flexible protrusion 16d extending, like a cantilever, toward a portion between the thrust poles 14a is bent and disposed in a flexible body 16b of a flexible circuit board 16. The flexible circuit board 16 is stably held without causing bouncing-up outward from the motor, or the like, by holding each land part 16a by pressing it on the surface side of a base frame 11 with a flexible force generated at the time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor having a flexible circuit board which extends outward from a land portion to which a terminal portion of a stator coil is electrically connected.

[0002]

2. Description of the Related Art Generally, in a motor, a shaft member and a bearing member are supported by a base frame so as to be relatively rotatable, and a stator coil is provided for each salient pole portion of a stator core fixed to the base frame. It is wound. The terminal of the stator coil is, for example,
It is pulled out to the land portion of the wiring pattern provided on the thin flexible circuit board and soldered, and the flexible circuit board extends in the radial direction from the soldered land portion and is led out of the motor. ing.

For example, in the example shown in FIG. 18, a lead wire 1a for power supply, which constitutes a terminal portion of a stator coil 1, is passed through a through hole 3 formed through a base frame 2 to the outside of the motor. Has been drawn to. An appropriate insulator (insulating paper) 4 is attached to the inner surface (upper surface in FIG. 18) of the base frame 2, and the lead wire 1 a is inserted through a coil through hole formed in the insulator 4. It is inserted into the through hole 3 so as to make it go through. On the other hand, a flexible circuit board (FPC) 5 for signal transmission is adhered to the outer surface of the base frame 2 (the lower surface in FIG. 18).
The flexible circuit board 5 covers the opening on the outside (lower side in FIG. 18) of the through hole 3 and allows the coil through hole provided in the flexible circuit board 5 to be inserted. Lead wire for power supply 1
a is once drawn out to the outside of the motor, and the power supply lead wire 1a drawn out to the outside is soldered to the land portion 6 of the flexible circuit board 5 so that electrical connection is established. Is being done.

[0004]

However, in the structure in which the lead wires 1a are soldered to the land portions 6 of the flexible circuit board 5 as in the above-mentioned general motor,
In many cases, it is not possible to meet the recent demand for thin motors. For example, when the axial thickness of the motor is set to 4 mm or less, when a lead wire having a wire diameter of 0.1 mm is to be soldered with a swell amount of 0.5 mm, the solder at the land portion The ratio of the height of the attachment becomes considerably large with respect to the thickness of the entire motor, and the electrical connection between the terminal portion of the stator coil 1 and the flexible circuit board 5 reduces the thickness of the motor. Would be a major obstacle.

In such a case, it is conceivable that a part of the base frame 2 is cut out or an opening is formed to absorb the height of the solder at the land portion 6. 2 is often set to be thin, and such a structure cannot often be adopted for reasons of rigidity.

On the other hand, in the motor disclosed in Japanese Patent Application Laid-Open No. 2000-209803, a terminal piece is projected from a main body of a flexible circuit board into a slot between salient poles so as to be inclined. The coil terminals are soldered to the lands provided on the respective terminal strips. However, in the structure described in the publication, both side edge portions of the terminal piece portion are
The structure is such that it locks to both adjacent salient poles, and by the locking action of the both side edges, the terminal piece that is going to elastically jump up to the outside of the motor is held in the slot. I try to make it. As a result, the holding state of the terminal pieces is very unstable, and if the locking state of each of the terminal pieces is released, the entire land section is pivoted. It may jump up in the direction and come into contact with other parts, resulting in a short circuit state.

Therefore, according to the present invention, the soldered portion of the land portion of the flexible circuit board can be extremely stably held at the position of the slot of the salient pole portion including the winding with a simple configuration. It is another object of the present invention to provide a motor that does not impair reliability even if the motor is thinned.

[0008]

In order to achieve the above object, in the motor according to the first aspect, the flexible main body of the flexible circuit board is cantilevered toward the portion between the salient pole portions. A projecting elastic protruding portion is formed, and a land portion is disposed at a free end side portion where the elastic protruding portion extends between the salient pole portions. The end portion is bent by positioning the land portion on the fixed portion side and fixing the flexible main body portion to the fixed portion, and the land portion of the elastic projecting portion is formed by the elastic force due to the bending. Is held so as to be pressed against the fixed portion side. Therefore, the soldered portion formed on the land portion of the flexible circuit board is bent by the bending elastic force of the free end portion of the elastic protruding portion.
The land is constantly pressed toward the fixing portion, and the soldering portion of the land is stably held by the urging force in the pressing direction.

Further, in the motor according to the present invention, a notch portion for assisting the bending of the elastic protruding portion is provided at a connecting portion between the flexible main body portion and the elastic protruding portion on the flexible circuit board. Therefore, the bending operation of the elastic protruding piece portion is easily and satisfactorily performed.

Further, in the motor according to the third aspect, a base frame can be used for the fixing portion to which the flexible main body is fixed, and in this case, in the motor according to the fourth aspect, the land portion is formed. Since the insulating member is mounted on the surface of the pressed base frame, the electric reliability of the motor is improved.

Further, in the motor according to the fifth aspect, the rotor magnet is attached to the rotor, and the base frame attracts the rotor magnet in the axial direction to regulate the position of the rotor in the thrust direction. Since the magnetic attraction member is provided and the flexible body portion of the flexible circuit board is held on the base frame side by the magnetic attraction member, a special fixing member for fixing the flexible circuit board is unnecessary. As a result, a favorable fixed state can be obtained at low cost.

Further, in the motor according to the present invention, since the magnetic attraction member or the base frame is provided with the guide groove for guiding the flexible main body of the flexible circuit board toward the outside of the motor, In the outer rotor type motor, the flexible circuit board is arranged easily and accurately along the guide groove.

Further, in the motor according to the present invention, the guide member for guiding the flexible main body portion of the flexible circuit board toward the outside of the motor is provided in the fixing member or the base frame of the stator core. In the inner rotor type motor, the flexible circuit board is easily and accurately arranged along the guide groove.

Further, in the motor according to the present invention, the leading portion of the flexible main body of the flexible circuit board to the outside of the motor excludes the operating range in the circumferential direction of the head or the actuator for driving the head. Since they are arranged within the range, the flexible circuit board and the movable range of the actuator motor are completely separated from each other in a non-interfering state, and the two do not wrap in the axial direction. Can be smoothly reduced in thickness.

Further, in the motor according to the ninth aspect, a plate may be fixed to the base frame integrally with the base frame, and the land portion may be pressed against the plate.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a motor according to the present invention will be described.
An embodiment applied to a hard disk drive (HDD) will be described with reference to the drawings.

The entire outer rotor type HDD spindle motor shown in FIGS. 1 and 2 includes a stator set 10 as a fixed member and a rotating member assembled to the stator set 10 from above in the figure. And the rotor set 20 of FIG. Of these, stator set 10
Has a base frame 11 screwed to a fixed base (not shown). This base frame 11
Is made of an aluminum-based metal material in order to reduce the weight, but approximately at the center of the base frame 11,
A fixed shaft 12 made of stainless steel or the like is provided upright, and the core holder 13 forms an annular wall portion integral with the base frame 11 so as to surround the periphery slightly away from the fixed shaft 12 in the radial direction. It is formed so that.

A stator core 14 made of a laminated body of electromagnetic steel sheets is fitted on a mounting surface provided on the outer peripheral side wall surface of the core holder 12, and as shown in FIGS. A stator coil 15 is wound around each of a plurality of salient pole portions 14a provided to extend radially on the stator core 14, thereby forming a core winding set. The stator coil 15 in the present embodiment includes:
It has three phases of U-phase, V-phase, and W-phase windings, and includes a terminal part of each phase and a terminal part of each common line.
The lead part 15a of the book is drawn out. These six leads 15a are electrically connected to each land 16a of the flexible circuit board (FPC) 16 by soldering.

More specifically, the above-mentioned flexible circuit board (FPC) 16 is provided with a wiring pattern 16c including the land 16a with respect to a thin flexible body 16b.
Are formed, and the stator core 14
A planar arc-shaped portion 16A surrounding the outer peripheral side portion for about half a circumference, and a planar linear portion 16B extending radially, that is, outward from the motor from a part of the outer peripheral edge of the arc-shaped portion 16A. Have.

Of the arc-shaped portion 16A, the six elastic protruding pieces 16d having the above-mentioned lands 16a protrude in a cantilever shape toward the center on the inner side at the inner peripheral edge of the arc-shaped portion 16A. It is provided to be. Each of the elastic projecting pieces 16d is arranged so as to extend toward the inside of the slot between the salient poles 14a of the stator core 14, and the inward projecting portion of each of the elastic projecting pieces 16d. The above-mentioned land portion 16
a is provided. The respective lead portions 15a of the stator coil 15 are soldered to the respective land portions 16a.

The wiring patterns 16c extending from the above-mentioned six land portions 16a are collectively extended into four, and the four wiring patterns 16c are bundled so as to be gathered at one place. After that, the linear portion 16
It extends radially outward along B.
At this time, the linear portion 16B is guided along a concave groove (not shown) provided in the above-described base frame 11, and a radially outer side portion of the base frame 11 has an axial direction. Outlet hole 1 formed through
1a (see FIG. 1), it is drawn out of the motor. The lead-out hole 11a is filled with an appropriate adhesive, so that dust and the like from the outside are prevented from entering the motor, and the cleanliness is maintained.

When assembling such a flexible circuit board 16 to the base frame 11 side, as shown in FIG. 7 in particular, once the core winding set of the stator core 14 and the stator coil 15 is once set. The flexible circuit board 16 is integrated with the core winding set by being soldered at the land portion 16a.

In order to connect the flexible circuit board 16 to the core winding set, specifically, each lead 15a of the stator coil 15 is soldered to the land 16a of the flexible circuit board 16. In the jig, the core winding set and the flexible circuit board 16 are arranged in a state reversed from the state shown in FIG. 7, that is, the land portion 16a of the flexible circuit board 16 is Each lead part 1 pulled out so as to come to the upper side
5a is land portion 1 of flexible circuit board 16 from above.
6a. At this time, it is preferable to dispose a support pin or the like for preventing a downward bending at the time of soldering below the land portion 16a in order to perform the soldering operation.

Then, the flexible circuit board 16 integrated with the core winding set is attached to the base frame side, whereby the flexible circuit board 16 is attached to the inner side (upper side in FIG. 1) surface of the base frame 11. The flexible circuit board 16 is mounted on the insulator (insulating paper) 19 thus mounted. Thereafter, a ring-shaped magnetic attraction plate 18 described later is mounted from above the core winding set, whereby the entire flexible circuit board 16 is axially pressed from above in FIG. Accordingly, the flexible main body 16b of the flexible circuit board 16 is pressed and fixed on the base frame 11 via the insulator (insulating paper) 19.

In this manner, when the flexible main body 16b of the flexible circuit board 16 is fixed to the base frame 11, the land provided on the free end portion of each elastic projection 16d is provided. The soldered portion of the portion 16a is also pressed onto the base frame 11 via the insulator (insulating paper) 19. The soldered portion of the land 16a is the base frame 1
By being located on one side, as shown in FIG. 1 in particular, the free end side portion of each of the elastic protruding pieces 16d is bent by the land 16a so as to be inclined. The soldering portion of the land portion 16a is formed by the elastic force caused by the bending of the elastic protruding pieces 16d.
It is held in a state of being strongly pressed in the axial direction (downward in FIG. 1) against the surface on the base frame 11 side.

At this time, the connecting portion of the flexible circuit board 16 at the base of each elastic projection 16d with the flexible main body 16b is attached to the elastic projection 16d.
A notch 16e is provided to assist the bending of the above, so that the above-described bending action is performed smoothly. In addition, it is preferable that each of the elastic protruding pieces 16d be shaped so as to be able to enter between the salient poles 14a of the stator core 14 in a state where the winding is wound, in order to reduce the thickness.

Returning to FIGS. 1 and 2, the fixed shaft 1
A bearing sleeve 21 as a rotary bearing member constituting the rotor set 20 is rotatably inserted into a portion of the rotor assembly 2 that protrudes from the base frame 11 in the axial direction. The bearing sleeve 21 is made of a copper-based alloy material such as phosphor bronze in order to facilitate processing of a small-diameter bearing hole.
The dynamic pressure surface formed on the inner peripheral surface side of the bearing hole is disposed so as to face the dynamic pressure surface formed on the outer peripheral surface side of the fixed shaft 12 in the radial direction. A radial dynamic pressure bearing portion RB is formed in a minute bearing gap space between the two dynamic pressure surfaces. In the radial dynamic pressure bearing portion RB, the dynamic pressure surface on the bearing sleeve 21 side and the dynamic pressure surface on the fixed shaft 12 side are arranged so as to circumferentially oppose each other with a small gap of about several μm. A predetermined lubricating fluid, such as a lubricating oil or a magnetic fluid, for generating a dynamic pressure is injected into the bearing gap space formed by the gap, and is held by capillary force.

Further, a radial dynamic pressure generating groove having a shape such as a herringbone shape (not shown) is formed on one of the two dynamic pressure surfaces of the bearing sleeve 21 or the fixed shaft 12, for example, in the axial direction. The lubricating fluid is pressurized by the pumping action of both radial dynamic pressure generating grooves to generate a dynamic pressure during rotation, and is fixed by the dynamic pressure of the lubricating fluid. Axis 1
2 and a rotor hub 23 to be described later is supported by a shaft while floating in the radial direction.

A ring-shaped retaining member 17 is fitted to the upper end of the fixed shaft 12 in the figure, and the bearing sleeve 21 is axially locked by the retaining action of the retaining member 17 in the axial direction. In the direction, so that it does not fall off due to external force such as impact or vibration.

On the other hand, a thrust plate 22 constituting a thrust bearing is attached to a large-diameter opening formed at the upper end of the bearing sleeve 21 in the figure.
Then, the projection 12a formed on the distal end surface (the upper end surface in FIG. 1) of the protruding side of the fixed shaft 12 comes into point contact with the inner surface side (the lower surface side in FIG. 1) of the thrust plate 22. A so-called pivot bearing is formed.

Further, on the outer peripheral surface of the bearing sleeve 21, a rotor hub 23 which also forms the rotor set 20 is provided.
Is attached. The rotor hub 23 is formed of a substantially cup-shaped member made of an aluminum-based metal or an iron-based alloy so as to mount a recording medium disk such as a magnetic disk (not shown), and is provided at a central portion of the rotor hub 23. The joint hole 23a is integrally joined to the outer peripheral surface of the bearing sleeve 21 by press fitting or shrink fitting. The rotor hub 23 has a mounting screw hole 23c in a mounting portion 23b that supports a recording medium disk, and is provided so as to project radially outward from the mounting portion 23b. Outer peripheral flange 23d
A ring-shaped rotor magnet 24 is fixed to the inner peripheral wall surface with an adhesive. The rotor magnet 24 is arranged in proximity to the outer peripheral end surface of each salient pole portion 14a of the stator core 14 so as to face in an annular manner.

A magnetic attraction plate made of a ring-shaped magnetic material such as a silicon steel plate or permalloy is provided on the inner surface (upper surface in FIG. 1) of the base frame 11 where the rotor magnet 24 faces in the axial direction. 18 are attached. The magnetic attraction plate 18 is driven by the magnetic attraction force acting between the rotor magnet 24 and the rotor set 2
0 is a member for attracting the entirety of the fixed shaft 12 to the base frame 11 side, and the protrusion of the fixed shaft 12 constituting the above-described pivot bearing is formed by the attraction between the magnetic attraction plate 18 and the rotor magnet 24. 12a and the thrust plate 22 are always kept in contact with each other. As a result, the position of the entire rotor set 20 is regulated in the thrust direction. For example, even when the motor is used upside down. , Without any problems. The magnetic attraction member 18 can be provided with a groove for guiding the flexible circuit board 16 described above.

The motor having such a configuration is used by being incorporated in a hard disk drive (HDD) as shown in FIGS. 8 and 9, for example. That is,
The motor M to which the disk D is attached is a sealed case 4
Each of the heads 43 is attached so as to be housed in the head 41 and is attached to the tip of a pair of head arms (gimbal) 42 provided in the actuator 41.
Are arranged so as to scan both sides of the disk D.

At this time, the head section 43 and the head arm 42 are appropriately moved within a scanning range HA which has a substantially fan-shaped plane as shown in FIG. The circumferential arrangement position of the lead-out hole 11a (see FIG. 1) outward of the motor is set within a circumferential range excluding such a scanning area HA of the head section 43 and the head arm 42 having a substantially fan-shaped plane. Have been. In this way, the height dimension of the device is not increased.

As described above, in the present embodiment, as shown in FIG.
The soldered portion formed at the portion (a) is constantly pressed toward the surface of the base frame 11 by the bending elastic force at the free end side portion of the elastic protruding piece portion 16d,
Due to the urging force of the pressing, the soldered portion of the land portion 16a is stably held without causing the motor to jump outwards as in the related art.

In this embodiment, a notch 16e for assisting the bending of the elastic protruding portion 16d is provided at a connecting portion between the flexible main body 16b and the elastic protruding portion 16d of the flexible circuit board 16. Because it is provided,
The bending operation of the elastic protruding piece 16d is performed easily and favorably.

At this time, in the present embodiment, the insulator (insulating paper) 19 is mounted on the surface of the base frame 11 against which the land portion 16a is pressed, so that the electric reliability of the motor is ensured. Have been.

Further, in this embodiment, the magnetic attraction member 18 that attracts the rotor magnet 24 in the axial direction and regulates the position of the rotor set 20 in the thrust direction is attached to the base frame 11 so that the flexible circuit board 16 can be mounted. Since the flexible main body 16b is held on the base frame 11, a special fixing member for fixing the flexible circuit board 16 is not required, and as a result, a good fixing state can be obtained at low cost. It has become.

In this embodiment, the flexible circuit board 1 is attached to the base frame 11 or the magnetic attraction member 18.
6 is provided with a guide groove for guiding the flexible main body portion 16b toward the outside of the motor. Therefore, in the outer rotor type motor, the flexible circuit board 16 can be easily and accurately aligned along the guide groove. It is designed to be placed.

Furthermore, in this embodiment, since the flexible main body 16b of the flexible circuit board 16 is arranged in a range other than the operating range HA in the circumferential direction of the head 43 or the actuator 43, the flexible main body 16b is flexible. Since the circuit board 16 and the movable range of the actuator are completely separated from each other so as not to interfere with each other and do not overlap each other in the axial direction, the motor can be thinned accordingly. ing.

On the other hand, in the embodiment shown in FIGS. 10 and 11 in which the same components as those in the above-described embodiment are denoted by the same reference numerals, the bottom surface of the base frame 31 has a non-circular irregular planar shape. Is formed on the other hand,
The flexible circuit board 16 is mounted so as to extend linearly without being extended stepwise (see FIG. 1) as in the above-described embodiment, and is led out of the motor.

In the embodiment shown in FIG. 12 in which the same components as those in the above-described embodiment are denoted by the same reference numerals, the present invention is applied to a shaft rotation type motor. A bearing / core holder 52 is provided at a substantially central portion of the frame 51, and a bearing sleeve 53 as a fixed bearing member is fixed in the bearing / core holder 52. And the bearing sleeve 5
3, the rotary shaft 54 holding the rotor hub 23 is rotatably supported. In such an embodiment, the same operation and effect as in the above-described embodiment can be obtained.

A dynamic bearing is used as the radial bearing portion RB of the embodiment shown in FIG. 12, and a pivot bearing is used as the thrust bearing SB, which is shown in FIG. In the embodiment, a dynamic pressure bearing is also used as the thrust bearing portion SB.
In such an embodiment, the same operation and effect as those of the above-described embodiments can be obtained.

On the other hand, the embodiment shown in FIG.
The present invention is applied to a shaft rotation / inner rotor type motor, in which a stator core 62 is fixed to an outer peripheral side wall surface of a base frame 61 and a rotor magnet 64 is attached to an inner peripheral side portion of a rotor hub 63. Is attached. Further, a portion of the base frame 61 axially facing the rotor magnet 64 includes:
A magnetic attraction plate 65 is mounted. The flexible circuit board 16 is led out of the motor through a fixed portion of the stator core 62.

Next, the embodiment shown in FIG.
In the embodiment of FIG.
Is fixed by a plate 66 fixed so as to be integrated with the base frame 61, and the land portion 16a of the flexible circuit board 16 is fixed to the above-described plate with an insulator (insulating paper) 67 interposed therebetween. 66. Also in this configuration, since the land portion 16a is located on the plate 66 side, when the flexible main body portion 16b of the flexible circuit board 16 is attached to the base frame 61 by the plate 66, the elastic protrusions The part 16d is the land part 1
Since it is pushed down by the thickness of 6a, the elastic projection 16d bends downward, while the land 16a is constantly pressed against the plate 66 side.

In such an embodiment, the same operation and effect as those of the above-described embodiments can be obtained. However, the present invention is not limited to each of the embodiments. It goes without saying that various modifications can be made without departing from the gist.

For example, in each of the above embodiments,
When attaching the flexible circuit board 16 to the base frame 11 side, as shown in FIG. 7, the flexible circuit board 16 is integrated with the core winding set, and
Flexible circuit board 1 integrated with the core winding set
6 is attached to the base frame 11 so that the flexible circuit board 16
Are mounted on the base frame 11, an insulator (insulating paper) 19, a flexible circuit board 16, a core winding set, and a magnetic attraction plate are placed in this order.
At this time, as shown in FIG. 16, the elastic projection 16d of the flexible circuit board 16 is bent upward by using the elasticity thereof, and the soldered portion of the land 16a is directed upward so that the lead of the stator coil 15 is turned upward. When the bent portion is released by soldering to the portion, the elastic protruding portion 16d can be pressed against the base frame 11 as shown in FIG. 17 due to its own elasticity.

In this case, it is desirable that the elastic protruding piece 16d be of such a size that the salient pole portion 14a of the stator core 14 does not hinder the bending operation. Notch portion 16 for assisting the bending of elastic projection piece portion 16d provided at the connection portion with base 16b
The size and shape of e also depend on the salient pole portions 14 of the stator core 14.
It is preferable to form the peripheral end of “a” out of the way so that the bending operation can be performed smoothly.

In each of the embodiments described above, the present invention is applied to a hard disk drive.
The present invention is not limited to this, and can be similarly applied to disk devices used in various other various devices and other various motors.

[0050]

As described above, the motor according to the first aspect of the present invention cantileverly extends from the flexible body portion of the flexible circuit board toward the portion between the salient pole portions. The flexible circuit board is stably held by bending and arranging the free end side portion of the elastic protruding piece portion and holding the land portion against the fixed portion side by the elastic force at that time. Therefore, with a simple configuration, the soldered portion in the land portion of the flexible circuit board can be extremely stably held in the slot of the salient pole portion, and even if the motor is made thinner. High reliability can be maintained.

In the motor according to the second aspect of the present invention, the connecting portion between the flexible main body and the elastic protruding portion of the flexible circuit board is provided with a notch for assisting the bending of the elastic protruding portion. In addition, since the bending operation of the elastic projecting piece portion is easily and favorably performed, the productivity of the motor can be improved in addition to the above-described effects.

Furthermore, in the motor according to the third aspect, since the fixing portion to which the flexible main body is fixed is a base frame, the flexible circuit board does not require any special parts. Of the land portion can be stably held.

Furthermore, in the motor according to the fourth aspect, an insulating member is mounted on the surface of the base frame against which the land is pressed, so that the electric reliability of the motor is improved. Thus, the above-described effect can be ensured.

Further, the motor according to claim 5 is
A magnetic attracting member that attracts the rotor magnet in the axial direction to regulate the position of the rotor in the thrust direction holds the flexible main body of the flexible circuit board on the base frame side, and specially fixes the flexible circuit board. Since the fixing member is not required and a good fixing state is obtained at low cost, the configuration of the motor can be further simplified.

According to a sixth aspect of the present invention, in the motor, the magnetic attraction member or the base frame is provided with a guide groove for leading the flexible main body of the flexible circuit board toward the outside of the motor. Since the motor can be easily and accurately arranged along the guide groove, the productivity of the motor can be improved in addition to the effects described above.

Further, in the motor according to the present invention, the guide member for leading the flexible main body portion of the flexible circuit board toward the outside of the motor is provided in the fixing member of the stator core or the base frame, and the flexible circuit board is provided. Can be easily and accurately arranged along the guide groove, and in addition to the above-described effects, the productivity of the motor can be improved.

Further, the motor according to claim 8 is
The flexible circuit board and the actuator for driving the head are arranged within a range excluding the operating range in the circumferential direction of the flexible circuit board, and the leading portion of the flexible body to the outside of the motor is moved so that the flexible circuit board and the actuator motor can move. Since the range and the area are completely separated from each other and arranged so as to smoothly reduce the thickness of the motor, it is possible to further reduce the thickness of the motor.

Furthermore, the motor according to claim 9 is
A plate is fixed to the base frame integrally with the base frame, and the land portion is pressed against the plate. Therefore, even when a plate is used, a soldering portion in the land portion of the flexible circuit board is used. Can be stably held.

[Brief description of the drawings]

FIG. 1 shows a hard disk drive (H) to which the present invention is applied.
FIG. 3 is an explanatory longitudinal sectional view of a motor used in DD).

FIG. 2 is an explanatory plan view of the motor shown in FIG. 1;

FIG. 3 is an explanatory plan view showing a winding set of a stator core used in the motor shown in FIG. 1;

FIG. 4 is an explanatory longitudinal sectional view of a winding set of the stator core shown in FIG. 3;

FIG. 5 is an explanatory plan view showing a structure of a flexible circuit board (FPC) used in the motor shown in FIG. 1;

6 is an explanatory plan view showing a state where the winding set of the stator core according to FIGS. 3 and 4 and the flexible circuit board (FPC) in FIG. 5 are assembled.

7 is a schematic assembly explanatory view showing a state in which a stator core winding set and a flexible circuit board (FPC) shown in FIG. 6 are mounted on a base frame side.

8 is an explanatory plan view showing a state where the motor shown in FIG. 1 is mounted in a hard disk drive (HDD).

FIG. 9 shows a hard disk drive (HD) shown in FIG.
It is a longitudinal section explanatory view of D).

FIG. 10 is an explanatory longitudinal sectional view of a motor according to another embodiment of the present invention.

11 is an explanatory plan view of the motor shown in FIG. 10;

FIG. 12 is an explanatory longitudinal sectional view of a motor according to still another embodiment of the present invention.

FIG. 13 is an explanatory longitudinal sectional view of a motor according to still another embodiment of the present invention.

FIG. 14 is an explanatory longitudinal sectional view of a motor according to still another embodiment of the present invention.

FIG. 15 is an explanatory longitudinal sectional view of a motor according to still another embodiment of the present invention.

16A and 16B are views showing another state in which the winding set of the stator core according to FIGS. 3 and 4 and the flexible circuit board (FPC) in FIG. 5 are assembled, wherein FIG. (B) is a partial longitudinal section explanatory view.

17A and 17B are views showing another assembled state shown in FIG. 16, wherein FIG. 17A is a partial plan explanatory view and FIG. 17B is a longitudinal sectional explanatory view.

FIG. 18 is an explanatory longitudinal sectional view showing an example of a conventional motor.

[Explanation of symbols]

 Reference Signs List 10 Stator set 11 Base frame 12 Fixed shaft 14 Stator core 14a Salient pole part 15 Stator coil 15a Lead part 16 Flexible circuit board (FPC) 16A Arc-shaped part 16B Linear part 16a Land part 16b Flexible body part 16c Wiring pattern 16d Elasticity Projection piece 11a Outlet 19 Insulator (insulating paper) 18 Magnetic attraction plate 20 Rotor set 21 Bearing sleeve 23 Rotor hub 24 Rotor magnet RB Radial dynamic pressure bearing 41 Actuator 42 Head arm (gimbal) 43 Head D disk HA Scanning range 51 Base frame 53 Bearing sleeve 54 Rotating shaft 61 Base frame 62 Stator core 63 Rotor hub 64 Rotor magnet

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification code FI Theme coat ゛ (Reference) H02K 29/06 H02K 29/06 Z F term (Reference) 5H002 AA07 AA08 AB05 AB08 AC06 5H019 AA08 AA10 CC04 DD01 EE01 EE07 EE09 EE11 EE13 FF01 5H603 AA09 BB01 BB10 BB13 CA01 CA05 CB04 CB13 CB20 CB22 CB26 CC11 CC17 CD01 CD04 CD21 CE01 FA16 5H604 AA05 AA08 BB01 BB10 BB14 BB17 CC01 CC05 CC16 DA14 JDB01 DB26 GBB07 J01

Claims (9)

[Claims] 1. A base frame for supporting a shaft member and a bearing member so as to be relatively rotatable, and a rotor rotatably supported by the base frame via a rotating member of the shaft member and the bearing member. A stator core fixed to the base frame and having a stator coil wound around a salient pole projecting in a radial direction; and a land portion to which a terminal portion of the stator coil is electrically connected by soldering. A flexible circuit board in which a flexible body portion is disposed so as to extend outward from the land portion toward the outside of the motor; anda flexible body portion of the flexible circuit board, An elastic protruding portion extending in a cantilever manner toward a portion between the salient pole portions, and a free end side on which the elastic protruding portion extends between the salient pole portions; In addition, the land portion is disposed, and the free end side portion of the elastic projection piece positions the land portion on the fixed portion side and fixes the flexible main body portion to the fixed portion. And a land portion of the elastic projecting piece portion is held by the elastic force of the bending so as to be pressed against the fixed portion side. 2. The flexible circuit board according to claim 1, wherein a connecting portion between the flexible main body portion and the elastic protrusion is provided with a notch for assisting the bending of the elastic protrusion. Item 7. The motor according to Item 1. 3. The motor according to claim 1, wherein the fixing portion to which the flexible main body is fixed is the base frame. 4. The motor according to claim 3, wherein the fixed portion against which the land portion is pressed is the base frame, and an insulating member is mounted on a surface of the base frame. 5. A rotor magnet is attached to the rotor, and the base frame is provided with a magnetic attraction member that attracts the rotor magnet in an axial direction and regulates a position of the rotor in a thrust direction. The motor according to claim 1, wherein the flexible main body of the flexible circuit board is held on the base frame side by a magnetic attraction member. 6. The magnetic attracting member or the base frame is provided with a guide groove for guiding a flexible main body of the flexible circuit board toward the outside of the motor. Motor. 7. The fixing member of the stator core or the base frame is provided with a guide groove for guiding a flexible main body of the flexible circuit board toward the outside of the motor. Motor as described. 8. The flexible circuit board according to claim 1, wherein the lead-out portion of the flexible main body to the outside of the motor is disposed within a range excluding a working range in a circumferential direction of the head or an actuator for driving the head. The motor according to claim 1, wherein: 9. The motor according to claim 1, wherein a plate is fixed to the base frame integrally with the base frame, and the land portion is pressed against the plate.