JPH08329627A - Positioning actuator for magnetic disk device and small-sized magnetic disk device - Google Patents

Abstract

PURPOSE: To provide a positioning actuator for a magnetic disk device and a small-sized magnetic disk device using it capable of sufficiently thinning their thickness by eliminating a dimensional obstacle to the thinning operation in a structure of supporting/fixing a load arm. CONSTITUTION: A load arm assembly body 7 is constituted of a nearly planar member provided with a slider 9 loading a magnetic head and an opening part 8A inserted with a bearing body 2, and is constituted of the load arm 8 holding the slider 9 and a spacer 10 provided with the opening part 10A inserted with the bearing body 2, and fixing the load arms 8 to the bearing body 2 while holding an interval between two load arms 8. The spacer 10 is fixed to the bearing body 2 by a method such as press fitting, adhesion, welding, calking and is fixed to the load arm 8 by the welding, etc. Further, the spacer 10 is arranged on the outside in the radial direction of a magnetic disk 16. Then, its thickness is (t)=0.7mm extent, and is made double or below of the thickness d of the magnetic disk 16.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a positioning actuator for a magnetic disk device used in a magnetic disk device,
And a small magnetic disk device using the same.

[0002]

2. Description of the Related Art Magnetic disk devices are being made thinner in addition to being made smaller. Recently, PCMCIA (Pe
rsonal Computer Memory Ca
rdInternational Associate
On) type 3 thin-type magnetic disk drive having a thickness of 10.5 mm has been commercialized. This thin magnetic disk device is called a PC card, which is an information medium that the Japan Electronics Industry Promotion Association and the US PCMCIA cooperate to promote standardization, and is aimed at making it light, thin, short, small and personalized. PC cards are available in types 1, 2, 3, and 4, and their thickness dimensions are 3.3, 5.0, 10.5,
It is 16.0 mm. Also, the external dimensions are 54.0 m wide.
The size is m and the length is 85.6 mm, which is a size capable of accommodating a 1.8-inch size magnetic disk. And PC
The card has a PCMCIA connector with 68 pins. The size is 3.3 mm × 54.0 mm. Although there are several standard specifications for PC cards, it is the above-mentioned device thickness that is relevant to the present invention.

The type 3 product has been devised such that the space between magnetic disks is narrowed in order to achieve a thickness of 10.5 mm. 13 to 15 show examples of known techniques relating to such a magnetic disk device. 13 is a side sectional view of a positioning actuator for positioning the magnetic head, FIG. 14 is a perspective view of the load arm assembly 7 shown in FIG. 13, and FIG. 15 is a side sectional view of the load arm assembly 7. Is. 13 to 15, the load arm assembly 7 includes a load arm 8, a slider 9 and a spacer 1.
The slider 9 having the magnetic head is pressed against the magnetic disk 16 with a predetermined biasing force. A spacer 10, which is a fixing member for fixing the load arm 8 to the carriage 17, is welded to the load arm 8 which is a holding member. The carriage 17 is fixed to the housing 5 of the bearing body 2, and the carriage 17 and the load arm assembly 7 are fixed by fitting the cylindrical portion of the spacer 10 into the carriage 17. In the above configuration, of the dimensions b and c determined by the thickness of the carriage 17 and the dimension a determined by the arrangement of the two upper and lower spacers 10, the cylindrical portions of the upper and lower two spacers 10 are overlapped to determine the dimension a. An attempt is made to reduce the gap between the magnetic disks 16 by reducing the size. A structure similar to the above is disclosed in Japanese Patent Laid-Open No. 4-2.
It is also disclosed in Japanese Patent No. 54973.

In addition to the above, as a known technique for reducing the thickness of the positioning actuator, there are, for example, the followings to be realized. [Patent Document 1] Japanese Unexamined Patent Publication No. 6-84302 SUMMARY OF THE INVENTION This known technique realizes thinning by directly welding a load arm to a carriage without using a spacer.

There is JP-A-6-267237.

This known technique realizes a thin structure without using a carriage by using an arm structure having a structure in which a mounting end is adhered to a load arm.

[0007]

However, the above-mentioned known technique has the following problems. That is, in the above-mentioned known technique, although the dimension a described in FIG. 13 can be shortened, the carriage is still provided and the dimensions b and c cannot be eliminated. Therefore,
Insufficient thinning.

Further, in the known technique, since the carriage is not provided, the dimension b and the dimension c are eliminated. However, since the end of the magnetic disk is located between the upper and lower two mounting ends that play the role of a member that connects the load arm to the bearing body, the two mounting ends should be spaced apart by that amount. They must be arranged, and as a result, the load arm is separated in the vertical direction, and this vertical dimension hinders the overall thinning of the positioning actuator. In addition to this, these mounting ends have a structure that supports the load arm in the form of a cantilever while being fixed by being inserted into the bearing body. Is relatively thick. Therefore, the size of the mounting end itself also hinders the thinning of the entire positioning actuator.

An object of the present invention is to provide a positioning actuator for a magnetic disk device that can be sufficiently thinned by eliminating a dimension that prevents thinning in a structure for supporting and fixing a load arm, and a small magnetic device using the same. It is to provide a disk device.

[0010]

In order to achieve the above object, according to the present invention, there is provided a bearing body having a shaft and a bearing; each of which is connected to the bearing body to record information on a magnetic disk. At least one arm mechanism for swingably supporting a magnetic head for reproduction; and a power generation mechanism for generating power for swing-driving the at least one arm mechanism; In a positioning actuator for a magnetic disk device that positions a magnetic disk at a predetermined position, each of the at least one arm mechanism includes two load arms that are formed of a substantially flat plate member having an opening that is inserted into the bearing body. Two sliders respectively provided on these two load arms and on which the magnetic head is mounted; and an opening inserted into the bearing body. At least one spacer which is provided at a position on the outer side of the magnetic disk in the radial direction and which connects the two load arms and the bearing body while maintaining a distance between the two load arms. A characterizing magnetic disk drive positioning actuator is provided.

Preferably, in the magnetic disk drive positioning actuator, the bearing body, the load arm, and the spacer have thermal expansion coefficients substantially the same as each other. To be done.

Further preferably, in the magnetic disk drive positioning actuator, the two load arms are integrally formed as one load arm body having a substantially U-shaped longitudinal section, and the two sliders are the load arms. One magnetic pole is provided near both ends of the body, and the at least one spacer is arranged in a space formed inside the load arm body to connect the load arm body and the bearing body. A positioning actuator for a disk device is provided.

Further, preferably, in the positioning actuator for the magnetic disk device, one spacer is provided for each arm mechanism, and the two load arms are fixed to the one spacer, respectively. A positioning actuator for a magnetic disk device is provided.

More preferably, in the positioning actuator for the magnetic disk device, t ≦ 4d, where d is the vertical thickness of the magnetic disk and t is the vertical thickness of the one spacer. A positioning actuator for a magnetic disk drive is provided.

Further preferably, in the magnetic disk drive positioning actuator, each arm mechanism is provided with two spacers, and the two load arms are respectively fixed to the two spacers. A characterizing magnetic disk drive positioning actuator is provided.

More preferably, in the magnetic disk drive positioning actuator, t ≦ 2d, where d is the vertical thickness of the magnetic disk and t is the vertical thickness of each of the two spacers. There is provided a positioning actuator for a magnetic disk device, which is configured as described above.

In the magnetic disk drive positioning actuator, preferably, the power generation mechanism is a voice coil motor, and the coil provided in the voice coil motor is provided in a bobbin connected to the bearing body. A positioning actuator for a magnetic disk device is provided.

Further preferably, in the magnetic disk drive positioning actuator, the power generation mechanism is a voice coil motor, and the coil provided in the voice coil motor is provided in the spacer. A positioning actuator for a magnetic disk device is provided.

In the magnetic disk drive positioning actuator, preferably, the power generating mechanism has a straight line connecting a center of the power generating mechanism and a shaft axis of the bearing body, and the shaft of the magnetic head and the bearing body. There is provided a positioning actuator for a magnetic disk device, which is arranged so as to intersect a straight line connecting the axes with a predetermined inclination angle.

Further preferably, in the magnetic disk drive positioning actuator, a plurality of the arm mechanisms are provided, and a first load arm provided in one of the plurality of arm mechanisms. ,
The distance between the rear surface on the side opposite to the slider and the second load arm provided in the other arm mechanism of the plurality of arm mechanisms and provided adjacent to the first load arm is r, and at least 1 There is provided a positioning actuator for a magnetic disk drive, characterized in that r ≦ t / 3, where t is the vertical thickness of one spacer.

In order to achieve the above object, according to the present invention, a bearing body having a shaft and a bearing; a magnetic head connected to each of the bearing bodies for recording / reproducing information on / from a magnetic disk. At least one arm mechanism for respectively swingably supporting the magnetic head; and a power generation mechanism for generating power for rocking and driving the at least one arm mechanism; In the positioning actuator for a magnetic disk device for positioning at a position, each of the at least one arm mechanism includes two load arms that are directly fixed to the bearing body; and the magnetic heads that are respectively provided on these two load arms. Positioning actuator for a magnetic disk device, characterized in that it has two sliders mounted thereon. Yueta is provided.

Preferably, in the magnetic disk drive positioning actuator, the two load arms provided in each arm mechanism are directly fixed to a housing provided on the outermost radial outer periphery of the bearing body. A characterizing magnetic disk drive positioning actuator is provided.

More preferably, in the magnetic disk drive positioning actuator, the two load arms are fixed to the housing by at least one of adhesion, welding, and screwing. A positioning actuator for a magnetic disk device is provided.

Further, preferably, in the positioning actuator for the magnetic disk device, the housing is 2
Two grooves are formed, and the two load arms are
A positioning actuator for a magnetic disk device is provided, which is fixed to the two grooves by at least one of press-fitting and caulking.

Further, preferably, in the positioning actuator for the magnetic disk device, the positioning actuator for the magnetic disk device is provided, wherein the bearing body and the load arm have substantially the same thermal expansion coefficients.

Further, preferably, in the magnetic disk drive positioning actuator, the two load arms are integrally formed as one load arm body having a substantially U-shaped longitudinal section. A positioning actuator for a device is provided.

In the magnetic disk drive positioning actuator, preferably, the power generating mechanism is a voice coil motor, and the coil provided in the voice coil motor is fixed to a bobbin connected to the bearing body. A positioning actuator for a magnetic disk drive is provided.

Further preferably, in the magnetic disk drive positioning actuator, the power generating mechanism has a straight line connecting a center of the power generating mechanism and a shaft axis of the bearing body, and the shaft of the magnetic head and the bearing body. There is provided a positioning actuator for a magnetic disk device, which is arranged so as to intersect a straight line connecting the axes with a predetermined inclination angle.

In order to achieve the above object, there is provided a small magnetic disk device provided with the positioning actuator for the magnetic disk device.

[0030]

In the present invention constructed as described above, in each arm mechanism, the slider to which the magnetic head is attached is
The magnetic head is swingably supported by being fixed to each of the two load arms and further connected to a bearing body while maintaining a distance between these two load arms with a spacer. At this time, since the spacer is located on the outer side in the radial direction of the magnetic disk, it is not necessary to arrange the two members for connecting the load arm to the bearing body with an interval of the magnetic disk as in the conventional case. The upper and lower load arms can be brought closer to each other. In addition, comparing the thickness of the spacers, the load arm, which is a substantially flat plate-shaped member whose opening is inserted into the bearing body, is connected to the bearing body by a spacer which is also inserted into the bearing body. Even if it is made relatively thin, it is possible to ensure the same level of support strength as the conventional mounting end that supports the load arm in the form of a cantilever. In other words, the thickness of the member itself that connects the load arm to the bearing body can be made thinner than before, so
The two lower load arms can be brought closer to each other. Therefore, due to the above two actions, the entire positioning actuator can be made sufficiently thin.

Further, since the bearing body, the load arm, and the spacer have substantially the same thermal expansion coefficient, the positional deviation due to thermal deformation can be reduced, so that the positioning accuracy of the magnetic head can be improved. it can.

Further, the two load arms are integrally formed as one load arm body having a substantially U-shaped longitudinal section, and two sliders are provided near the both ends of the load arm body, and at least one slider is provided. By arranging the spacer in the space formed inside the load arm body and connecting the load arm body and the bearing body, the number of parts can be reduced as compared with the case where two load arms are used.

Further, one spacer is provided for each arm mechanism, and two load arms are fixed to one spacer respectively, so that, for example, when two spacers are fixed to two load arms, respectively. The number of parts can be reduced more than that.

Further, when the vertical thickness of the magnetic disk is d and the vertical thickness of one spacer is t, t
By configuring so that ≦ 4d, it is possible to prevent the thickness of the spacer from becoming excessively large, which prevents the actuator from being made thin.

Further, two spacers are provided for each arm mechanism, and the two load arms are fixed to the two spacers, respectively, so that a structure for connecting the load arms to the bearing body can be realized.

Further, when the vertical thickness of the magnetic disk is d, and the vertical thickness of each of the two spacers is t, t ≤ 2d, so that the spacer thickness becomes excessively large. Therefore, it is possible to prevent the reduction of the thickness of the entire actuator from being hindered.

Further, the power generating mechanism is a voice coil motor, and the coil provided in the voice coil motor is provided on the bobbin connected to the bearing body, so that the power from the voice coil motor is generated. It is possible to realize a configuration in which the arm mechanism is swung to position the magnetic head at a predetermined position on the magnetic disk. And, for example, in the case of an actuator in which two magnetic disks are mounted,
If the bobbin and the coil have a thickness of about 0.8 mm, the maximum vertical dimension of the entire actuator can be reduced to 5.6 mm or less, and the actuator can be mounted on the magnetic disk device of the PC card type 3. Further, if the thickness of the bobbin and the coil is suppressed to about 0.2 mm, the maximum vertical dimension of the entire actuator can be reduced to 5.0 mm or less, and the actuator can be mounted on the magnetic disk device of the PC card type 2.

Further, the power generating mechanism is a voice coil motor, and the coil provided in the voice coil motor is provided on the slider, so that the bobbin is not used, and therefore the thickness can be further reduced. Becomes For example, in the case of an actuator in which only one magnetic disk is mounted, the maximum vertical dimension of the entire actuator can be set to 3.3 mm or less. Therefore PC
It can be mounted on the magnetic disk device of the card type 1.

Further, in the power generation mechanism, a straight line connecting the center of the power generation mechanism and the shaft axis of the bearing body and a straight line connecting the magnetic head and the shaft axis of the bearing body intersect each other at a predetermined inclination angle. That is, the magnetic head, the bearing body shaft, and the power generation mechanism are not arranged on the same straight line, but are arranged in an L shape at a certain angle. Therefore, unlike the conventional case where the magnetic head / bearing body shaft / power generation mechanism is arranged in a straight line, when the spacer is provided at the outer position in the radial direction of the magnetic disk and the load arm becomes long and the surrounding space of the bearing body is narrow. However, a power generation mechanism having a predetermined torque can be arranged. This is particularly effective when the diameter of the magnetic disk is 1.3 inches or less, which further narrows the space around the shaft of the bearing body.

Further, a plurality of arm mechanisms are provided, and a first load arm provided in one of the plurality of arm mechanisms and another arm mechanism in the plurality of arm mechanisms are provided. R ≦ t, where r is the distance between the second load arms provided adjacent to the first load arm and the rear surfaces on the side opposite to the slider, and t is the vertical thickness of at least one spacer. With the configuration of / 3, it is possible to prevent the reduction in the thickness of the entire actuator from being hindered by the excessively large distance r between the back surfaces of the adjacent load arms. Therefore, for example, in the case of an actuator in which two magnetic disks are mounted, r is 0.2 when the spacer thickness t≈0.7 mm.
If it is suppressed to about mm, the maximum vertical dimension of the entire actuator can be 5.0 mm or less, and the actuator can be mounted on the magnetic disk device of the PC card type 2.

Further, in the present invention, in each arm mechanism, the slider to which the magnetic head is attached is fixed to two load arms, respectively, and these two load arms are further fixed to the bearing body to swing the magnetic head. Support as much as possible. At this time, by fixing the load arm directly to the bearing body without interposing a member such as a spacer, it is possible to reduce the influence of the interval when installing the member connecting the load arm to the bearing body and the thickness of the connecting member itself. It is possible to make the entire positioning actuator sufficiently thin without receiving it.

Further, the two load arms provided in each arm mechanism are directly fixed to the housing provided on the outermost circumference in the radial direction of the bearing body, so that the load arm is directly fixed to the bearing body. it can.

Further, since the two load arms are fixed to the housing by at least one of adhesion, welding and screwing, a method of fixing the load arms to the bearing body can be realized. .

Further, the housing is formed with two grooves, and the two load arms are fixed to the two grooves by at least one method of press fitting and caulking, so that the bearings of the load arms are fixed. A method of fixing to the body can be realized.

[0045]

Embodiments of the present invention will be described below with reference to the drawings. A first embodiment of the present invention will be described with reference to FIGS. The present embodiment is an embodiment of a positioning actuator for a magnetic disk device that can mount two magnetic disks. The same members as those of the conventional technique shown in FIGS. 13 to 15 are designated by the same reference numerals. A side sectional view of the positioning actuator according to this embodiment is shown in FIG. In FIG. 1, a positioning actuator 100 includes a bearing body 2 fixed to a base 1, a load arm assembly 7 connected to the bearing body 2 via a spacer 10 (described later), and a swinging motion of the load arm assembly 7. It is composed of a voice coil motor 50 and the like that generates power for kinetic driving, and is housed inside a sealed space whose upper portion is covered by a cover 18 fixed to the base 1 by a screw or the like (not shown).

The bearing body 2 includes a shaft 4 fixed to the base 1, two ball bearings 3 fixed to the shaft 4, and 2
It is composed of a ring 6 for obtaining a gap between the two ball bearings 3 and a housing 5 fixed to the outside of the two ball bearings 3. Although the ring 6 and the outer ring of the ball bearing 3 are separate members from the housing 5 here, they may be integrated.

The detailed structure of the four sets of load arm assemblies 7 is shown in FIGS. 2 is a side view of one load arm assembly 7, and FIG. 3 is one load arm assembly 7.
FIG. 2 and 3, the load arm assembly 7 is a magnetic head (not shown) that performs information recording and reproducing operations on the magnetic disk 16 that is a recording medium.
A loader 8 for holding the slider 9 and an opening 10A for insertion into the bearing body 2 and a slider 9 for mounting the slider 9 and an opening 8A for insertion into the bearing body 2. And a spacer 10 for fixing the two load arms 8 to the bearing body 2 while keeping a distance between them, and the load arm assembly provided in the positioning actuator according to the prior art shown in FIGS. 14 and 15. 7 has a larger dimension in the longitudinal direction.

The spacer 10 is press-fitted / bonded / fixed to the bearing body 2.
It is fixed by a method such as welding or caulking, and is also fixed to the load arm 8 by welding or the like. Also spacer 1
Zeros are arranged so as to be arranged at substantially the same height in the radial outside of the magnetic disk 16, that is, in the lateral direction. The thickness t is about 0.7 mm, which is less than twice the thickness d of the magnetic disk 16. The load arm 8 serves to press the slider 9 against the magnetic disk 16 with a predetermined biasing force. Further, a gimbal (not shown) for improving the posture of the slider 9 is provided at a portion of the load arm 8 fixed to the slider 9, and a slider 9 is provided on a surface of the slider 9 facing the magnetic disk 16. The magnetic disk 16 is processed so as to maintain a minute interval (not shown).

Incidentally, the load arm 8 and the spacer 1
0 and the bearing body 2 are made of materials having substantially the same coefficient of thermal expansion, so that the positional deviation due to thermal deformation is reduced and the positioning accuracy of the magnetic head is improved. Further, of the four load arm assemblies 7 shown in FIG. 1, the upper two load arm assemblies 7, 7 are arranged such that the sides on which the sliders 9 are mounted (hereinafter appropriately referred to as front faces) face each other. , And the two lower load arm assemblies 7, 7 constitute one arm mechanism. Needless to say, the load arm assembly 7 is not necessarily limited to this configuration.

Returning to FIG. 1, the magnetic circuit of the voice coil motor 50 is composed of a yoke 13 fixed to the base 1, a magnet 12, and a coil 11. The coil 11 is fixed to the bearing body 2 via the bobbin 14 by a method such as press fitting, adhesion, welding, caulking, and screwing. The power line of the coil 11 and the signal line of the magnetic head (not shown) are FPC (Flexible Printed).
A circuit (not shown) is connected to a control circuit board (not shown). The coil 11 may be directly fixed to the bearing body 2 without an intervening component such as the bobbin 14.

In the above structure, by appropriately controlling the energizing direction and energizing time for the coil 11, each load arm assembly 7 is oscillated and driven via the bobbin 14 and the bearing body 2, and the slider 9 on which the magnetic head is mounted. The direction and magnitude of the swinging torque that acts on the magnetic disk 16 are freely controlled, and the magnetic head is positioned at a desired position on the magnetic disk 16.

In the positioning actuator 100 of the present embodiment configured as described above, since the b dimension and the c dimension in the prior art shown in FIG. 13 can be eliminated by not using the carriage, it is possible to reduce the thickness. be able to. In addition, the spacer 10 is the magnetic disk 16
Since it is located on the outer side in the radial direction of the load arm, it is not necessary to arrange the two members for connecting the load arm to the bearing body with an interval corresponding to the magnetic disk as in the conventional case. It is possible to bring 8, 8 closer together. Further, the load arm 8 which is a substantially flat plate member having the opening 8A inserted in the bearing body 2 is fixed to the bearing body 2 by the spacer 10 having the opening 10A also inserted in the bearing body 2. Even if the spacer 10 is relatively thin, it is possible to secure the same supporting strength as that of the conventional mounting end that supports the load arm in the form of a cantilever. That is, the thickness of the member itself for fixing the load arm 8 to the bearing body 2 can be made thinner than before, so that the upper and lower two load arms 8 and 8 can be made closer to each other.

Therefore, as a result of the above, the entire positioning actuator 100 can be made sufficiently thin. That is, for example, the load arm 8 has a thickness of 4
And the number of sliders 9 is about 2.2 mm, the thickness d of the magnetic disk 16 is about 0.8 mm, the gap between the cover 18 and the lower side of the cover 18 is about 0.8 mm, and the gap between the base 1 and the upper side of the base 1 is about 0.8 mm. About 1.0 mm, and the thickness of the coil 11 and the bobbin 14 (= the anti-slider 9 of the load arm 8
The distance r between the side and back surfaces is about 0.8 mm. Therefore, the dimension from the upper surface of the base 1 to the lower surface of the cover 18 is 5.
The size is about 6 mm, and it can be mounted on a magnetic disk device of a PC card type 3 (device thickness of 10.5 mm or less). Further, here, the thickness r of the coil 11 and the bobbin 14
If the distance is suppressed to about 0.2 mm (r ≦ t / 3 at this time), the dimension from the upper surface of the base 1 to the lower surface of the cover 18 becomes about 5.0 mm, and the PC card type 2 (device thickness 5 mm or less) It can also be installed in the magnetic disk device of.

A second embodiment of the present invention will be described with reference to FIG. In this embodiment, the structure of the load arm assembly is different. The same members as those in the first embodiment are designated by the same reference numerals. FIG. 4 shows a side view of the load arm assembly 207 provided in the positioning actuator for the magnetic disk drive of this embodiment. In FIG. 4, the present embodiment is different from the first embodiment in that two load arm assemblies 207, 2 are provided.
07 are connected by one load arm body 208 integrally formed in a substantially U-shaped vertical cross section such that the two load arms 8 of the first embodiment shown in FIG. 2 are connected. Is. Corresponding to this, one slider 9 is provided near each end of the load arm body 208, and one spacer 210 is arranged in the space formed inside the load arm body 208. Body 208
Are fixed to the bearing body 2, and as a result, two load arm assemblies 207 are configured. The other structure is similar to that of the first embodiment.

According to this embodiment, in addition to the same effects as those of the first embodiment, there is an effect that the number of parts can be reduced.

At this time, the spacer may be divided into upper and lower two parts as shown in FIG. 1, or may be divided into a larger number.

A third embodiment of the present invention will be described with reference to FIGS. In this embodiment, the structure of the load arm assembly is different. The same members as those in the first and second embodiments are designated by the same reference numerals. FIG. 5 shows a side view of the entire positioning actuator 300 according to this embodiment, and FIG. 6 shows a side view of the load arm assemblies 307 and 307. 5 and 6, the present embodiment is different from the first embodiment in that
Between the load arms 8 and 8 of the two load arm assemblies 307 and 307, the thickness in the vertical direction that is approximately twice that of the spacer 10 according to the first embodiment (that is, the thickness t of the spacer 10≈
One spacer 310 having a thickness of 1.4 mm is 4 times or less the thickness d of the magnetic disk 16). The other structure is similar to that of the first embodiment.

According to this embodiment, in addition to the same effects as the first embodiment, there is an effect that the number of parts can be reduced.

It is also conceivable to dispose a large number of spacers divided into three or more, or to use a spacer divided horizontally instead of upward or downward, contrary to the third embodiment. In addition, in the second and third embodiments,
It is also possible to fix three or more load arms 8 to one spacer 10.

A fourth embodiment of the present invention will be described with reference to FIG. In this embodiment, the structure of the load arm assembly is different. The same members as those in the first to third embodiments are designated by the same reference numerals. A load arm assembly 407 provided in the positioning actuator for the magnetic disk device of this embodiment.
A bottom view of the is shown in FIG. In FIG. 7, the present embodiment is the third
Of the load arm assembly 40.
The spacer 410 provided in No. 7 has a substantially cylindrical shape, and the shape of the load arm assembly 408 is correspondingly changed. The other structure is almost the same as that of the third embodiment.

According to this embodiment, the same effect as that of the third embodiment can be obtained.

A fifth embodiment of the present invention will be described with reference to FIG. The present embodiment is an embodiment of a positioning actuator for a magnetic disk device that can mount one magnetic disk. The same members as those in the first to fourth embodiments are designated by the same reference numerals. FIG. 8 is a side sectional view showing the overall structure of the positioning actuator for a magnetic disk device according to this embodiment. In FIG. 8, the positioning actuator 500 of this embodiment is shown.
The main difference from the first embodiment of FIG. 1 is that only two load arm assemblies 7 are provided corresponding to the single magnetic disk 16 and that the coil 11 has a bobbin. That is, it is directly fixed to the spacer 10 without intervening.
The other structure is almost the same as that of the first embodiment.

In FIG. 8, the bearing body 2 has two very thin ball bearings 3. However, the present invention is not limited to this structure, and one bearing may be used.

According to this embodiment, the positioning actuator 200 as a whole can be made sufficiently thin as in the first embodiment. That is, the thickness dimension is about 1.1 mm with the two load arms 8 and the two sliders 9, about 0.4 mm with one thickness d of the magnetic disk 16, and the gap between the cover 18 and the lower side of the cover 18 is 0. It is about 8 mm, and the gap between the base 1 and the upper side of the base 1 is about 1.0 mm. Therefore, the size from the upper surface of the base 1 to the lower surface of the cover 18 can be reduced to 3.3 mm or less, and the PC card type 1 (device thickness of 3.3 mm or less) can be mounted on the magnetic disk device. It goes without saying that it can also be mounted on the magnetic disk devices of the PC card type 2 (device thickness of 5 mm or less) and the PC card type 3 (device thickness of 10.5 mm or less).

Further, in the first to fourth embodiments, four load arm assemblies for positioning on two magnetic disks 16 are used, and in the fifth embodiment, positioning for one magnetic disk 16 is performed. Although the two load arm assemblies are provided, the present invention is not limited to this, and it goes without saying that the same structure according to the present invention can be applied to positioning of three or more magnetic disks.

A sixth embodiment of the present invention will be described with reference to FIG. This embodiment is an embodiment of a positioning actuator for a magnetic disk device that directly fixes a load arm to a bearing body without using a spacer or the like. The same members as those in the first to fifth embodiments are designated by the same reference numerals. The load arm assembly 607 included in the positioning actuator according to the present embodiment.
FIG. 9 is a perspective view showing the above structure and the structure for mounting it on the bearing body. In FIG. 9, the load arm assembly 607 of this embodiment is the load arm assembly 7 of the first embodiment.
The difference is that the load arm assembly 607 is composed only of the load arm 608 and the slider 9, and the two load arms 608, 608 are bonded, welded, and screwed to the housing 605 provided on the outermost circumference of the bearing body 2 in the radial direction. It is to be fixed directly by such as. At this time, the housing 60
It goes without saying that it is preferable that the bearing body 2 including 5 and the load arms 608 and 608 are made of materials having substantially the same thermal expansion coefficient. The other structure is almost the same as that of the first embodiment.

According to the present embodiment, the load arm 608 is directly fixed to the bearing body 2 without interposing a member such as a spacer, whereby the interval for installing the member for connecting the load arm to the bearing body, The entire positioning actuator can be made sufficiently thin without being affected by the thickness of the connecting member itself.

The seventh embodiment of the present invention will be described with reference to FIG. The present embodiment is an embodiment in which the mounting structure of the load arm to the bearing body is different. The same members as those in the first to sixth embodiments are designated by the same reference numerals. FIG. 10 is a perspective view showing the structure of the load arm assembly provided in the positioning actuator according to the present embodiment and the structure for mounting the load arm assembly on the bearing body. In FIG. 10, the present embodiment is different from the sixth embodiment in that the housing 705 has two groove portions 705.
A and 705A are provided to the load arm 60
8,608 is fixed by press-fitting / caulking. The other structure is almost the same as that of the sixth embodiment.
Also in this embodiment, the same effect as in the sixth embodiment can be obtained.

The eighth embodiment of the present invention will be described with reference to FIG. The present embodiment is an embodiment in which the mounting structure of the load arm to the bearing body is different. The same code | symbol is attached | subjected to the member equivalent to 1st-7th Example. FIG. 11 is a perspective view showing the structure of the load arm assembly provided in the positioning actuator according to the present embodiment and the structure for mounting the load arm assembly on the bearing body. In FIG. 11, this embodiment is different from the sixth embodiment in that the two load arms 60 of the sixth embodiment are different.
A substantially vertical section U formed integrally by connecting 8,608
One of the character-shaped load arm bodies 808 is fixed to the housing 805 by adhesion, welding or the like.

The other structure is almost the same as that of the sixth embodiment. Also in this embodiment, the same effect as in the sixth embodiment can be obtained.

In the above sixth to eighth embodiments,
It goes without saying that the shapes of the housing and the load arm are not limited to those shown in FIGS. 9 to 11.

The ninth embodiment of the present invention will be described with reference to FIG. This embodiment is an embodiment of a magnetic disk device provided with a positioning actuator. The same members as those in the first to eighth embodiments are designated by the same reference numerals. FIG. 12 is a top view showing the entire structure of the magnetic disk device according to the present embodiment, which is viewed with the cover removed. In FIG. 12, the magnetic disk device of this embodiment is intended for a magnetic disk 16 having a diameter of 1.3 inches. The magnetic disk 16 fixed to the base 1 and the magnetic disk 16 as a recording medium is fixed at a predetermined speed. A spindle motor 19 that rotates at
A cover which is composed of a positioning actuator 900 for positioning a magnetic head (not shown) for recording / reproducing information on / from the magnetic disk 16 at a predetermined position of the magnetic disk 16, and is fixed to the base 1 by screws (not shown). It is housed inside a closed space whose top is covered by.

The positioning actuator 900 includes a bearing body 2 supported and fixed to the base 1 so that its axis is parallel to the spindle motor 19 in the lateral direction of the magnetic disk 16, and the bearing body 2 is fixed to the bearing body 2 as in the first embodiment. A load arm assembly 7 mounted with a magnetic head, which is connected through a spacer 10;
The voice coil motor 50 generates power for rocking the load arm assembly 7.

In the voice coil motor 50, a straight line m ₁ connecting the center of the voice coil motor to the shaft axis of the bearing body 2 and a straight line m ₂ connecting the magnetic head to the shaft axis of the bearing body 2 have a predetermined inclination angle. The magnetic circuits are arranged so as to intersect with each other at θ, and the magnetic circuit includes a yoke 13 fixed to the base 1, a coil 11, and a magnet 12. Then, the coil 11 is fixed to the bearing body 2 via the bobbin 14 by a method such as press fitting, adhesion, welding, caulking, and screwing.

The power line end of the coil 11 has an FPC (Flexible Print) arranged in a curved shape.
d Circuit 15) and a connector 21 connected to the FPC 15 to electrically connect to a control circuit board (not shown) provided below the base 1 and configured by a drive circuit for the spindle motor 19 and the voice coil motor 50. Connected to each other. In addition, the FPC15 has a read / write IC
Is mounted, and the head signal line drawn from the magnetic head is connected to this read / write IC,
It is electrically connected to the control circuit board. At this time, F
The PC 15 has one end on the load arm assembly 7 and the other end on the FP.
It is fixed to the base 1 via the C fixing member 20,
C15 obeys the swing of the load arm assembly 7 (described later) and changes its curved shape subtly.

The structure of the positioning actuator 900, which is not otherwise specified, is substantially the same as that of the positioning actuator 100 of the first embodiment.

In the above structure, the load arm assembly 7 is oscillated through the bobbin 14 and the bearing body 2 by appropriately controlling the energizing direction and energizing time for the coil 11, and the slider 9 on which the magnetic head is mounted is driven. The magnetic head is positioned at a desired position on the magnetic disk 16 by freely controlling the direction and magnitude of the swing torque that acts. In addition, it is preferable that the center of gravity of the positioning actuator 400 is substantially aligned with the swing axis of the bearing body 2.

The operation and effect of this embodiment as described above will be described below. Normally, the voice coil motor of the positioning actuator should be arranged on a straight line connecting the magnetic head and the swing shaft of the bearing body (that is, the magnetic head / bearing body swing shaft / voice coil motor should be arranged on a straight line). There are many. However, in the magnetic disk device of this embodiment, as described in the first embodiment, the spacer 10 is provided at the radially outer position of the magnetic disk 16 and the load arm 8 is elongated in the longitudinal direction (see FIG. (See 1 etc.) As a result, the structure is such that the surrounding space of the bearing body 2 is narrowed and the magnetic disk 16 is a small magnetic disk device having a diameter of 1.3 inches. Then, the volume of the voice coil motor 50 becomes very small, and the torque for moving the magnetic head becomes insufficient.

Therefore, in the magnetic head device of this embodiment, a straight line m ₁ connecting the center of the voice coil motor 50 to the shaft axis of the bearing body 2 and a straight line m connecting the magnetic head to the shaft axis of the bearing body 2. ₂ and ₂ are arranged so as to intersect each other with a predetermined inclination angle θ. That is, the magnetic head, the swing shaft of the bearing body 2, and the voice coil motor 50 are arranged in a substantially L shape. Thereby, a space for arranging the voice coil motor 50 having a predetermined torque can be secured. It is needless to say that when the diameter of the magnetic disk 16 is smaller than 1.3 inches, the space around the bearing body 2 is further reduced, which is more effective.

[0080]

According to the present invention, the spacer is located on the outer side in the radial direction of the magnetic disk, and the load arm, which is a substantially flat plate-shaped member having the opening inserted through the bearing, has the same opening. Since the spacer is connected to the bearing body by the spacer inserted in, the entire positioning actuator can be made sufficiently thin. If such a positioning actuator is used, a thin and highly accurate magnetic disk device can be obtained, and it can be applied to a PC card. Further, according to the present invention, since the load arm is directly fixed to the bearing body without interposing a member such as a spacer, the interval at which the member connecting the load arm to the bearing body is installed, and the thickness of the connecting member itself. The overall thickness of the positioning actuator can be sufficiently reduced without being affected by the influence.

[Brief description of drawings]

FIG. 1 is a side sectional view of a positioning actuator for a magnetic disk device according to a first embodiment of the present invention.

2 is a side view of the load arm assembly shown in FIG. 1. FIG.

3 is a bottom view of the load arm assembly shown in FIG. 1. FIG.

FIG. 4 is a side view of a load arm assembly provided in a positioning actuator for a magnetic disk device according to a second embodiment of the present invention.

FIG. 5 is a side view of the entire positioning actuator for a magnetic disk device according to a third embodiment of the present invention.

6 is a side view of the load arm assembly shown in FIG.

FIG. 7 is a bottom view of a load arm assembly included in a positioning actuator for a magnetic disk device according to a fourth embodiment of the present invention.

FIG. 8 is a side sectional view of a positioning actuator for a magnetic disk device according to a fifth embodiment of the present invention.

FIG. 9 is a perspective view showing a structure of a load arm assembly provided in a positioning actuator for a magnetic disk drive according to a sixth embodiment of the present invention and a structure for mounting the load arm assembly on a bearing body.

FIG. 10 is a perspective view showing a structure of a load arm assembly provided in a positioning actuator for a magnetic disk drive according to a seventh embodiment of the present invention and a structure for mounting the load arm assembly on a bearing body.

FIG. 11 is a perspective view showing a structure of a load arm assembly provided in a positioning actuator for a magnetic disk drive according to an eighth embodiment of the present invention and a structure for mounting the load arm assembly on a bearing body.

FIG. 12 is a top view showing the entire structure of a magnetic disk device according to a ninth embodiment of the present invention, as seen from a state where a cover is removed.

FIG. 13 is a side sectional view of a conventional positioning actuator for a magnetic disk device.

14 is a perspective view showing a detailed structure of the load arm assembly shown in FIG.

15 is a side sectional view showing a detailed structure of the load arm assembly shown in FIG.

[Explanation of symbols]

1 Base 2 Bearing Body 3 Ball Bearing 4 Shaft 5 Housing 6 Ring 7 Load Arm Assembly 8 Load Arm 8A Opening 9 Slider 10 Spacer 10A Opening 11 Coil 12 Magnet 13 Yoke 14 Bobbin 15 FPC 16 Magnetic Disc 17 Carriage 19 Spindle Motor 20 FPC Fixing Member 21 Connector 50 Voice Coil Motor (Power Generation Mechanism) 100 Magnetic Disk Drive Positioning Actuator 207 Load Arm Assembly 208 Load Arm Body 210 Spacer 300 Magnetic Disk Drive Positioning Actuator 307 Load Arm Assembly 310 Spacer 407 Load Arm Assembly 408 Load arm 410 Spacer 500 Positioning actuator for magnetic disk device 605 Housing 607 Doamu assembly 608 load arm 705 linearly m ₂ magnetic head and the bearing connecting the housing 705A groove 805 housing 808 Thickness m ₁ voice coil motor center of the load arm body 900 a magnetic disk apparatus for positioning actuator d magnetic disk and the bearing body shaft axis Straight line connecting the body shaft axis r Distance between the rear surfaces of the load arm on the side opposite to the slider t Spacer thickness

Claims (20)

[Claims] 1. A bearing body having a shaft and a bearing; and at least one arm mechanism which is swingably supported by a magnetic head for recording / reproducing information on / from a magnetic disk. A power generation mechanism that generates power for swinging and driving the at least one arm mechanism; and a positioning actuator for a magnetic disk device, which positions the magnetic head at a predetermined position of the magnetic disk, Each of the one arm mechanisms is composed of two load arms formed of a substantially flat plate member having an opening that is inserted into the bearing body; and the magnetic heads are mounted on the two load arms, respectively. Two sliders; an opening that is inserted into the bearing body, and is provided at a position radially outside the magnetic disk, At least one spacer and while maintaining the distance between serial two load arms connecting the bearing member with the two load arms; positioning actuator for a magnetic disk apparatus characterized by having. 2. The positioning actuator for a magnetic disk device according to claim 1, wherein the bearing body, the load arm, and the spacer have substantially the same thermal expansion coefficients. Actuator. 3. The positioning actuator for a magnetic disk device according to claim 1, wherein the two load arms are integrally formed as one load arm body having a substantially U-shaped longitudinal section, and the two sliders are the same. One each is provided near both ends of the load arm body, and the at least one
A positioning actuator for a magnetic disk drive, wherein one spacer is arranged in a space formed inside the load arm body to connect the load arm body and the bearing body. 4. The magnetic disk drive positioning actuator according to claim 1, wherein each of the arm mechanisms is provided with one of the spacers, and the two load arms are fixed to the one spacer, respectively. A positioning actuator for a magnetic disk device, characterized by: 5. The positioning actuator for a magnetic disk device according to claim 4, wherein t ≦ 4d, where d is the vertical thickness of the magnetic disk and t is the vertical thickness of the one spacer. A positioning actuator for a magnetic disk device, which is configured. 6. The magnetic disk drive positioning actuator according to claim 1, wherein each arm mechanism is provided with two spacers, and each of the two load arms is fixed to each of the two spacers. A positioning actuator for a magnetic disk device characterized by the above. 7. The positioning actuator for a magnetic disk device according to claim 6, wherein t ≦ 2d, where d is the vertical thickness of the magnetic disk and t is the vertical thickness of each of the two spacers. A positioning actuator for a magnetic disk device, which is configured as follows. 8. The positioning actuator for a magnetic disk device according to claim 1, wherein the power generating mechanism is a voice coil motor, and the coil provided in the voice coil motor is a bobbin connected to the bearing body. A positioning actuator for a magnetic disk device, which is provided in the. 9. The magnetic disk drive positioning actuator according to claim 1, wherein the power generating mechanism is a voice coil motor, and the coil provided in the voice coil motor is provided in the spacer. A positioning actuator for a magnetic disk device, characterized by: 10. The positioning actuator for a magnetic disk device according to claim 1, wherein the power generating mechanism is
A straight line connecting the center of the power generation mechanism and the shaft axis of the bearing body and a straight line connecting the magnetic head and the shaft axis of the bearing body are arranged so as to intersect at a predetermined inclination angle. A positioning actuator for a magnetic disk device, characterized by: 11. The magnetic disk drive positioning actuator according to claim 1, wherein a plurality of the arm mechanisms are provided, and a first load provided in one of the plurality of arm mechanisms. A distance r between the rear surfaces on the side opposite to the slider between the arm and the second load arm provided in the other arm mechanism of the plurality of arm mechanisms and provided adjacent to the first load arm is r, A positioning actuator for a magnetic disk device, wherein r ≦ t / 3 when the vertical thickness of the at least one spacer is t. 12. A bearing body having a shaft and a bearing;
At least one arm mechanism that is swingably supported by each of the magnetic heads that are respectively connected to the bearing bodies and that record and reproduce information on and from the magnetic disk; A power generation mechanism for generating power, which positions the magnetic head at a predetermined position on the magnetic disk, wherein each of the at least one arm mechanism is directly connected to the bearing body. A positioning actuator for a magnetic disk device, comprising: two fixed load arms; and two sliders respectively mounted on the two load arms and on which the magnetic head is mounted. 13. The positioning actuator for a magnetic disk device according to claim 12, wherein the two load arms provided in each arm mechanism are directly fixed to a housing provided on an outermost circumference in the radial direction of the bearing body. A positioning actuator for a magnetic disk device, which is characterized in that: 14. The magnetic disk drive positioning actuator according to claim 13, wherein the two load arms are fixed to the housing by at least one of adhesion, welding, and screwing. A characteristic positioning actuator for magnetic disk devices. 15. The positioning actuator for a magnetic disk device according to claim 13, wherein the housing is 2
Two grooves are formed, and the two load arms are
A positioning actuator for a magnetic disk drive, which is fixed to the two grooves by at least one of press-fitting and caulking. 16. The positioning actuator for a magnetic disk device according to claim 12, wherein the bearing body and the load arm have substantially the same thermal expansion coefficients. 17. The positioning actuator for a magnetic disk device according to claim 12, wherein the two load arms are integrally formed as one load arm body having a substantially U-shaped longitudinal section. Positioning actuator for magnetic disk drive. 18. The positioning actuator for a magnetic disk device according to claim 12, wherein the power generating mechanism is a voice coil motor, and the coil provided in the voice coil motor is a bobbin connected to the bearing body. A positioning actuator for a magnetic disk device, wherein the positioning actuator is fixed to the. 19. The positioning actuator for a magnetic disk device according to claim 12, wherein the power generation mechanism has a straight line connecting a center of the power generation mechanism and a shaft axis of the bearing body, the magnetic head and the bearing body. A positioning actuator for a magnetic disk device, wherein a straight line connecting the shaft axes of the magnetic disk device and the straight line intersects with each other at a predetermined inclination angle. 20. A small magnetic disk device comprising the positioning actuator for a magnetic disk device according to claim 1.