JP2002106586A - Bearing device, actuator, bearing unit for actuator, method and metallic mold for manufacturing actuator, and disc device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To not only provide an accurized actuator having a simple structure, reducing the number of part items, accomplishing a reduction in cost, and using a synthetic resin material synthetically meeting all conditions such as heat resistance, rigidity, electrical conductivity, cost, accuracy, seismic control properties and elasticity but also provide a bearing device, a bearing unit for the actuator, a method and a metallic mold for manufacturing the actuator and a disc device. SOLUTION: The bearing unit, which is disposed in such a manner as to form a gap from the inner surface of the bearing hole of a bearing part, is fixed to a desired position within the metallic mold, and a filler is infilled into the gap between the bearing unit and the bearing hole around the bearing unit so as to form a holding layer.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk device for recording and reproducing information, and more particularly to a bearing device for supporting a rotating body,
The present invention relates to an actuator on which a head is mounted, a bearing unit for the actuator, a method for manufacturing the actuator, a mold for manufacturing the actuator, and a disk device using the actuator.

[0002]

2. Description of the Related Art Conventionally, a hard disk drive (HD)
A disk drive for information recording represented by D) uses an oscillating actuator which mounts a head for reading and writing and oscillates the head so as to draw an arc-shaped orbit. In the swing type actuator, a bearing portion for holding a rotating shaft is formed in an intermediate portion thereof, and the entire actuator is configured to be swingable (rotationally swingable) about the shaft center. A coil portion having a flat coil is provided at one end of the actuator, and is arranged between permanent magnets having different polarities to drive the actuator. An arm is provided at the other end of the actuator, and a head is attached to the end. In order to arrange the head at the tip of the arm portion at a predetermined position on the disk-shaped recording medium, the coil is energized to rotate the actuator in rotation. The change of the swing direction is performed by changing the direction of the current supplied to the coil. The actuator is provided with a stopper for regulating the swing range of the actuator and a lock device for fixing the actuator when reading and writing are not required.

In recent years, as information devices have become smaller, lighter, thinner, more functional, higher in capacity, and lower in price, there has been a demand for smaller, lighter, faster, and lower cost actuators in information recording disk devices. Is getting stronger. In order to meet this demand, attempts to reduce the size and weight of the actuator,
Various methods have been proposed for simplifying the assembly process and reducing the price.

A typical example of a proposal for reducing the weight of an actuator in a conventional disk drive is disclosed in Japanese Patent Application Laid-Open No. 61-10 / 1986.
There is one disclosed in Japanese Patent No. 4376. In this publication, attempts have been made to resinize the parts constituting the actuator, particularly the arm part. Further, as a typical example which proposes a simplification of a conventional method of assembling an actuator, there is one disclosed in Japanese Patent Application Laid-Open No. 1-23756. This publication discloses a method of integrally fixing a coil constituting a coil portion and a terminal pin with a resin or the like.

Further, an actuator in which a sleeve for inserting a bearing into a bearing hole of a bearing portion of an actuator is integrally formed is disclosed in Japanese Patent Laid-Open Nos. 5-20806 and 7-1.
No. 35763. Japanese Patent Application Laid-Open Nos. 5-198140 and 6-351215 disclose proposals in which an arm made of metal, resin, or the like is integrated with an actuator using a molten resin or the like.

In the conventional actuator, a method of grounding static electricity generated between a rotating disk-shaped recording medium and a head through a bearing or a shaft made of a metal material has been attempted. For example, JP-A-6-29
Japanese Patent Application Laid-Open No. Hei 9 (1994) No. 5542 discloses a method of applying a metal film to a resin-molded arm portion.
Japanese Patent Application Laid-Open No. 9601/1990 discloses a method in which a conductive material is embedded in an arm of an actuator and molded, and Japanese Patent Application Laid-Open No. 9-55046 discloses a structure in which the arm itself is formed from a conductive material. .

In the various actuators disclosed in each of the above publications, a bearing for holding a rotating shaft for rotational oscillation is press-fitted, fitted or screwed into a bearing mounting hole formed in a bearing portion of the actuator in advance. And so on.

Next, the structure of a general conventional actuator will be specifically described with reference to FIGS.
FIG. 38 is a perspective view showing a configuration of a conventional actuator main body, and shows only the actuator main body before a bearing is mounted. FIG. 39 is a perspective view showing a state where a bearing is mounted on the actuator body of FIG. 38, and FIG. 40 is an enlarged sectional view showing the vicinity of the bearing part of FIG. As shown in FIGS. 38 and 39, the actuator body
At its center, a bearing 1 for holding a rotating shaft for swinging motion about the center of the shaft, and a head for reading and writing information are attached to a free end protruding laterally from one side wall of the bearing 1. And a coil portion 3 disposed so as to protrude from the other side wall of the bearing portion 1. The coil section 3 has a coil 4 which is arranged in a magnetic circuit and driven by the operation of the magnetic circuit. A head (not shown) for holding the head is fixed to the tip of the arm 2 of the actuator body.

The actuators shown in FIGS. 38 and 39 are currently widely used in actual hard disk drives (HDDs).
This is an oscillating actuator used for such purposes.
The bearing 1 and the arm 2 of the actuator are collectively called a carriage or an E block, and are integrally formed using a metal material such as aluminum or magnesium. In the following description, the combination of the bearing 1 and the arm 2 is called a carriage.

As shown in FIG. 38, a bearing hole 6 is formed in a bearing portion 1 at a substantially central portion of the actuator, into which a rotating shaft through which the actuator rotates and swings is inserted. The bearing 10 and a rotating shaft (not shown) are inserted into the bearing hole 6 during assembly. As shown in FIG. 39, the bearing 10 that rotatably holds the rotating shaft is fixed to the bearing hole 6 by press fitting or screwing. When a head used in a hard disk drive or the like is attached to the tip of the arm 2, the actuator needs to move and hold the head to a position on a recording track that is extremely accurate. For this reason, the bearing hole 6, which serves as the center for rotating and swinging the actuator, must have high positional accuracy and high internal surface finish.

In the conventional actuator, the carriage portion is made of an aluminum material which is currently most frequently used. In the case where the carriage portion is formed by die-casting or extrusion using an aluminum material, a precise bearing hole 6 for directly mounting a bearing cannot be formed. For this reason,
In the post-processing after the formation of the carriage, the dimensional finishing and the inner surface processing are usually further performed by using a lathe or a machining process. Further, in the bearing 1 and the arm 2 of the actuator, a head mounting hole 7 for mounting a head, the weight of the arm 2 can be reduced,
An opening 8 formed for adjusting the resonance frequency of the head, a wiring fixing hole 9 used for fixing a wiring for guiding a signal from the head, and the like are formed. These head mounting holes 7 and wiring fixing holes 9 are formed in post-processing or the like. The head attached to the head attachment hole 7 is attached to the tip of a thin plate made of stainless steel or the like called a suspension, and this suspension is fixed to the head attachment hole 7 formed at the tip of the arm 2. .

[0012]

In the conventional actuator, since it is required to reduce the weight and simplify the assembling process, a portion in which a bearing portion and an arm portion are integrally formed,
In a so-called carriage, the use of engineering plastics having high rigidity and capable of precision molding has been proposed. However, an actuator having a carriage formed of such an engineering plastic has not been satisfactory as an information recording disk device such as a hard disk drive.
Conventional actuators do not use a resin material that satisfies all conditions such as heat resistance, rigidity, conductivity, cost, precision, vibration damping, and elasticity. A satisfactory product could not be produced.

Further, in the conventional actuator, a method of integrally forming another member (sleeve) with the bearing to insert the bearing into the bearing hole of the bearing portion, or a method of melting an arm previously formed of metal or resin or the like. There has been a forming method in which the actuator is integrated with a resin or the like. As described above, it is possible to easily press-fit the bearing into the bearing hole by using another member, or to select a material having physical properties required for the arm by forming the arm with another member.
However, this configuration increases the number of parts,
The structure becomes complicated, leading to an increase in cost, and it is difficult to maintain the accuracy of the entire actuator.

A rotating disk-shaped recording medium;
In order to ground static electricity generated between the actuator arm and head through metal material bearings and shafts,
The method of applying a metal film to the resin molded on the actuator arm has obviously led to an increase in cost. In addition, the method of embedding a conductive material such as a metal in the arm and molding the arm increases the number of parts and increases the cost and accuracy as described above. Furthermore, in the conventional manufacturing method in which the arm itself is formed using a resin-based conductive material, the resin-based conductive material has a relatively high electric resistance compared to an aluminum material that is frequently used as an arm of a hard disk actuator. Therefore, it is necessary to mix another conductive material to reduce the electric resistance. However, since it is necessary to mix still another conductive material into the resin-based conductive material, the cost of the actuator is increased, and contamination due to the mixing of unnecessary materials is caused.

In a conventional information recording disk device, especially in an actuator used for a hard disk, the head collides with a recording medium due to vibration of a resonance frequency generated around the head when an impact or the like is applied. A phenomenon, a so-called head slap phenomenon, occurs.
However, such a head slap phenomenon has not been considered at all in a conventional actuator. The present invention aims to solve the above-mentioned various problems in the conventional swing type actuator, and satisfies all conditions such as heat resistance, rigidity, conductivity, cost, accuracy, vibration damping, elasticity, and the like. An object of the present invention is to provide an actuator that uses a resin material and that has a simple structure, a small number of parts, and a high accuracy that achieves low cost. It is another object of the present invention to provide a bearing device for holding a rotating shaft, a bearing unit for an actuator, a method for manufacturing an actuator, a mold for manufacturing an actuator, and a disk device.

[0016]

In order to achieve the above object, a bearing device according to the present invention comprises a bearing portion having a bearing hole, and a bearing unit arranged with a gap from an inner surface of the bearing hole. And a holding layer in which a filler is filled in a gap between the bearing unit fixed at a desired position in the mold and the bearing hole and solidified. In the bearing device of the present invention configured as described above, the gap between the bearing hole and the bearing unit is filled with the filler in the mold and the bearing unit is fixed at a predetermined position of the bearing unit. The process of assembling the parts is reduced. Further, by holding the bearing unit at a predetermined position in the mold, the mounting accuracy of the bearing unit with respect to the bearing portion can be matched with the mold processing accuracy. Further, since the bearing unit in the bearing hole is configured to be fixed to the bearing portion by filling the filler, the bearing hole does not require high machining accuracy, and according to the present invention, the machining cost is high at low machining cost. An accurate bearing device can be provided.

An actuator according to the present invention comprises: an arm section to which a head for reading and writing information is attached; a bearing section for holding a rotating shaft for swinging the head; and a magnetic circuit for swinging the head. A bearing unit having a coil unit having a coil disposed therein, wherein the bearing unit is disposed with a gap from an inner surface of a bearing hole formed in the bearing unit; and the bearing hole and the bearing And a holding layer in which a filler is filled in a gap with the unit and solidified. In the thus configured actuator of the present invention, the gap between the bearing hole and the bearing unit is filled with the filler in the mold and the bearing unit is fixed at a predetermined position of the bearing unit. The number of assembling steps is reduced. Further, by holding the bearing unit at a predetermined position in the mold, the mounting accuracy of the bearing unit with respect to the bearing portion can be matched with the mold processing accuracy. Furthermore, since the bearing unit in the bearing hole is configured to be fixed to the bearing portion by filling with a filler, the machining accuracy of the bearing hole does not need to be high, and according to the present invention, the machining cost is low. And a high-precision actuator can be provided. Further, when the actuator of the present invention is used for a recording device such as a hard disk drive, the resonance frequency of the actuator, particularly the arm, can be changed by filling the periphery of the bearing unit with a filler. As a result, it is possible to reduce a phenomenon in which the head hits the recording medium (head slap phenomenon) when an impact is applied to the actuator. Further, according to the present invention, it is possible to provide a high-precision oscillating-type actuator that is excellent in impact resistance and low in processing cost.

According to another aspect of the invention, there is provided an actuator.
An arm portion to which a head for reading and writing information is attached, a bearing portion for holding a rotating shaft for swinging the head,
An actuator having a coil portion having a coil disposed in a magnetic circuit to swing the head, wherein the bearing portion is disposed with a gap from an inner surface of a bearing hole formed in the bearing portion. And a holding layer in which a filler is filled and solidified in a gap between the bearing hole and the bearing unit, and at least a part of the arm portion is formed of the filler and fixed to the bearing portion. It is configured. In the actuator of the present invention having the above-described structure, the arm parts which are manufactured separately by an inexpensive method such as press working in advance can be simultaneously fixed by the filler in the bearing unit fixing step.

According to another aspect of the present invention, there is provided an actuator.
An arm portion to which a head for reading and writing information is attached, a bearing portion for holding a rotating shaft for swinging the head,
An actuator having a coil portion having a coil disposed in a magnetic circuit to swing the head, wherein the bearing portion is disposed with a gap from an inner surface of a bearing hole formed in the bearing portion. Bearing unit, and a holding layer solidified by filling a gap between the bearing hole and the bearing unit with a filler, wherein at least a part of the coil portion is formed of the filler, and the coil portion is It is configured to be fixed to the bearing portion. In the actuator of the present invention thus configured, the bearing unit and the coil can be fixed at the same time, and the assembling process can be simplified. Also, the bearing unit held in the mold,
Since the filler is poured into each gap between the coil, bearing, and arm, it is fixed, so the relative positions of those elements match the mold precision and can be held at a high level of precision. The accuracy after fixing is also high. For this reason, according to the present invention, productivity is improved, and in particular, there is a great effect that each element can be arranged in a mold at a time by a robot or the like automated in mass production.

According to another aspect of the present invention, there is provided an actuator having an arm for mounting a head for reading and writing information, a bearing for holding a rotating shaft for swinging the head, and swinging the head. An actuator having a coil portion having a coil arranged in a magnetic circuit for the bearing unit, wherein the bearing unit is disposed with a gap from an inner surface of a bearing hole formed in the bearing unit,
A gap between the bearing hole and the bearing unit is provided with a solidified holding layer filled with a filler, and at least a part of the coil portion is formed of the filler. It is different from the filler of the holding layer. In the actuator of the present invention configured as described above, it is possible to select an optimum material for the fixation of the coil and the fixation of the bearing unit.

The bearing unit of the actuator according to the present invention includes an arm portion having a head for reading and writing information, a bearing portion for holding a rotating shaft for swinging the head, and a device for swinging the head. A bearing unit used in an actuator having a coil portion having a coil disposed in a magnetic circuit, wherein the bearing unit is fixed to a holding layer of a filler to hold the rotating shaft, and a groove, a hole, Substantial irregularities such as projections are formed. In the bearing unit of the present invention configured as described above, the filler is fixed along the surface of the unevenness such as the groove, the hole, or the protrusion on the side cylindrical surface of the bearing unit to have an anchor effect, and the bearing unit has the bearing hole. From falling off is prevented.

In the method of manufacturing an actuator according to the present invention, an arm portion to which a head for reading and writing information is attached and a rotating shaft for swinging the head are held by a filler holding layer via a bearing unit. In a method for manufacturing an actuator having a bearing portion and a coil portion having a coil arranged in a magnetic circuit for swinging the head, the method includes the steps of: Fixing the bearing unit at a predetermined position, filling at least a gap between the bearing hole and the bearing unit with a filler by an injection molding method or a compression molding method, and solidifying the filler to form a holding layer. Formed steps. The method for manufacturing an actuator according to the present invention having such steps is suitable for mass production of the actuator at low cost.

In the mold for manufacturing an actuator according to the present invention, an arm portion to which a head for reading and writing information is attached, and a rotating shaft for swinging the head are formed by a filler holding layer via a bearing unit. What is claimed is: 1. A mold for manufacturing an actuator, comprising: a bearing portion to be held; and a coil portion having a coil arranged in a magnetic circuit for swinging the head. And a mechanism for fixing the bearing unit at a predetermined position, so that at least a gap between the bearing hole and the bearing unit is filled with a filler by an injection molding method or a compression molding method. The thus-configured mold for manufacturing an actuator of the present invention is suitable for mass-producing a low-cost and high-precision actuator.

The disk device according to the present invention includes the actuator configured as described above. The disk device of the present invention configured as described above can simplify the assembling process by using the swing type actuator configured as described above, and includes an inexpensive and high-precision actuator. Can be. In addition, since the filler for fixing the bearing unit for rotating and oscillating the actuator can be freely selected, the resonance frequency of the arm portion can be changed, particularly when used in a hard disk drive device. In this case, the resonance frequency in the final completed state to which the head is attached can be adjusted to an optimum one. Further, the hard disk drive configured as described above has significantly improved head slap resistance and impact resistance.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the actuator according to the present invention will be described below with reference to the accompanying drawings using specific examples.

<< Embodiment 1 >> An embodiment 1 which is one embodiment of the actuator according to the present invention will be described below with reference to FIGS. FIG. 1 is a perspective view illustrating a configuration of the actuator body according to the first embodiment, and illustrates a state before a bearing is mounted. FIG. 2 is a perspective view showing a state in which a bearing is mounted on the actuator body of FIG. 1, and FIG.
FIG. 3 is an enlarged sectional view showing the vicinity of a bearing portion of the actuator of FIG. As shown in FIGS. 1 and 2, the actuator according to the first embodiment has a bearing 101 that holds a pivot shaft for swinging motion at a central portion thereof and protrudes laterally from one side wall of the bearing 101. An arm 102 on which a head for reading and writing information is attached at a free end side, and a coil unit 103 arranged to protrude from the other side wall of the bearing unit 101
It is composed of The coil unit 103 has a coil 104 that is arranged in a magnetic circuit and driven by the operation of the magnetic circuit.

The actuator of the first embodiment is an oscillating actuator widely used in hard disk drives (HDDs) and the like at present. The bearing portion 101 and the arm portion 102 of the actuator are collectively called a carriage or an E block, and are integrally formed of a metal material such as aluminum or magnesium. In the following description, the bearing unit 101 and the arm unit 102 are collectively called a carriage. Further, in the coil portion 103, a terminal pin 105 serving as a connection end of the coil 104 is formed in addition to the coil 104. Coil 10
4 and the terminal pins 105 are fixed to the coil section 103, and the coil section 103 is fixed to the bearing section 101 with a resin or an adhesive.
It is fixed to. Thus, the actuator has the bearing unit 101, the arm unit 102, and the coil unit 103 integrally formed.

As shown in FIG. 1, a bearing 101 formed at a substantially central portion of the actuator is provided with a bearing hole 106 for mounting a bearing unit 110 for rotatably holding the actuator. This bearing hole 10
6 has an inner diameter larger than the outer diameter of the bearing unit 110. A holding layer 111 made of a filler is formed around the bearing unit 110 inserted into the bearing hole 106.
That is, the holding layer 111 is formed between the outer periphery of the bearing unit 110 and the inner periphery of the bearing hole 106, and the bearing unit 110 is fixed to the bearing portion 101 by the holding layer 111. The holding layer 111 is formed by filling a resin material between an inner surface of a bearing hole 106 of an actuator member and an outer surface of the bearing unit 110 by an injection molding method at the time of assembling. Is done. In the first embodiment, the holding layer 111 is filled and formed by an injection molding method. However, the holding layer 111 may be formed by a compression molding method.
Excellent in accuracy, cost, etc. Bearing unit 110
Has an inner ring part 110A and an outer ring part 110B, and a metal ball as a rotating body is arranged between them. In the first embodiment, the inner ring portion is fixed, and the outer ring portion is configured to swing and rotate together with the bearing portion 101 having the bearing hole 106.

Further, as the filler for forming the holding layer 111 in Example 1, a thermotropic liquid crystal polymer resin of a thermoplastic resin was used. However, the filler for the holding layer 111 is basically a material that can be filled in the mold, and may be any material that solidifies after filling. Especially cost, productivity,
In order to solve problems such as accuracy, it is desirable to use a filler made of a resin material or a metal material. As the resin-based filler, both a thermoplastic resin and a thermosetting resin can be used, but a thermoplastic resin is particularly suitable from the viewpoint of productivity and the like. Also, in the thermoplastic resin, acrylonitrile styrene copolymer, polyether ether ketone resin, polyether nitrile resin, polyether sulfone resin, polyethylene naphthalate resin, syndiotactic polystyrene resin, polyamide resin, polyacetal resin, polycarbonate resin , Modified polyoxide resin, polybutylene terephthalate resin, polyethylene terephthalate resin, polyphenylene ether resin, polyphenylene sulfide resin, polysulfone resin, polyarylate resin, thermotropic liquid crystal polymer resin,
Engineering plastics such as polyether resin, polyimide resin, acrylonitrile butadiene styrene, and polypropylene are suitable.

Further, among the thermoplastic resins, heat resistance,
In addition to thermotropic liquid crystal polymer resin, polyphenylene sulfide resin,
Polyethersulfone resin is optimal. In the above resin, the main components are shown, and a combination of different fats using a so-called polymer alloy, talc, mica, calcium carbonate, silica, titanium oxide, clay, calcium sulfate, magnesium hydroxide, alumina, barium zinc oxide By mixing inorganic and organic fillers such as iron oxide, ferrite, molybdenum sulfide, and graphite, and fibrous fillers such as glass fiber, carbon fiber, and various whiskers, into the above resin, the mechanical strength, toughness, electrical properties, etc. It is also effective to use a material whose physical property value is changed.

Further, an adhesive may be used as a filler for the holding layer 111. As the adhesive, an adhesive of epoxy resin type, urea formaldehyde resin type, bismaleimide triazine resin type, acrylic type or the like is used. The present invention is also effective when the bearing is fixed to the bearing portion using the adhesive as the filler. This adhesive may be of any kind, such as two-part, one-part, and thermosetting. In particular, when an adhesive is used as the holding layer 111 in a hard disk drive (HDD), it is effective to use one that takes into account the effects of exhaust gas during use, so-called outgassing. For example,
It is particularly preferable to use an acrylic adhesive after baking (firing) at 80 to 90 ° C. When a metal material is used as the filler of the holding layer 111, an aluminum material or a magnesium material is suitable.

The holding layer 111 formed of the filler as described above holds the bearing unit 110 at a predetermined position of the actuator. As described above, since the bearing unit 110 according to the first embodiment is fixed by the holding layer 111 filled and fixed in the bearing hole 106, the bearing unit 1 fixed in forming the bearing hole 106 is used.
Accuracy for placing 10 in the correct position is not required. The bearing hole 106 only needs to be formed at a position where the bearing unit 110 is disposed and slightly larger than the outer diameter of the bearing unit 110, and is not limited to a cylindrical shape. The thus formed bearing hole 106 and bearing unit 110
Is filled with the filler, and the bearing unit 110 is accurately arranged and fixed at a desired position. Therefore, as described in the section of the related art, it is not necessary to perform accurate drilling to form the bearing hole 106, and a lathe or machining is not required. Also, the bearing unit 110 can be fixed regardless of the inner surface finish of the bearing hole 106, and the bearing hole 106 can be fixed by die casting or extrusion.
The bearing unit 110 can be fixed without performing the surface treatment in a state where is formed.

In the actuator according to the first embodiment, a projection 143 is formed on the inner surface of the bearing hole 106 as shown in FIG. By providing the plurality of protrusions 143 in this manner, the filler is solidified after being filled so as to cover the protrusions 143 during manufacturing. Therefore, the solidified filler (holding layer 1)
11) is fixed to the projection 143, and the projection 143 exerts an anchor effect, so that the filler holding layer 111 is reliably prevented from falling out of the bearing hole 106 or rotating inside. Any filler may be used as long as it can be solidified later from a fillable state and fixed to the bearing unit 101 and the bearing unit 110. In particular, a resin or metal melt is desirable because it can be filled in a narrow gap between the bearing unit 110 and the bearing hole 106, is easy to handle, has low cost, and has high productivity.

In the first embodiment, the relative position of the bearing unit 110 with respect to the carriage of the bearing unit 101 and the arm unit 102 is determined by filling the filler with the carriage and the bearing unit 110 fixed in a mold in the manufacturing process. For fixing, each part is determined by the die holding the parts, and the accuracy of the relative position is determined by the processing accuracy of the die.

Next, a basic mechanism by which the swing type actuator according to the first embodiment of the present invention can improve the machining accuracy will be described with reference to FIGS. 4 and 5. FIG.
In the following description, the relative positional accuracy between the bearing unit 110 fixed to the bearing unit 101 and the head mounting hole 107 formed in the arm unit 102 will be mainly described as an example.

FIG. 4 is a plan view showing an example in which an actuator is manufactured by a conventional manufacturing method. The actuator shown in FIG. 4 is a case where the bearing 10 is formed by press-fitting the bearing 10 into the bearing hole 6 of the bearing 1. In the carriage 14 composed of the bearing unit 1 and the arm unit 2 shown in FIG. 4, the distance between the center of the bearing 10 press-fitted into the bearing hole 6 and the center of the head mounting hole 7 is indicated by reference character A. FIG. 5 is a plan view showing the actuator according to the first embodiment of the present invention. As described above, the holding layer 111 is formed between the bearing hole 106 and the bearing unit 110, and the bearing unit 110 is fixed at a predetermined position. FIG. Carriage 1 of FIG.
At 14, the distance between the center of the bearing unit 110 and the center of the head mounting hole 107 is indicated by the symbol B. The carriages shown in FIGS. 4 and 5 are both manufactured by aluminum die casting.

The bearing hole 6 formed in the conventional actuator shown in FIG. 4 is formed by machining a hole previously formed by die casting, for example, by lathing or machining. The head mounting hole 7 is formed by positioning the hole with reference to the previously processed bearing hole 6 and then drilling the hole. An error included in the distance A from the center of the bearing 10 to the center of the head mounting hole 7 in the thus formed actuator of FIG. 4 will be described below. Here, there is no gap between the bearing 10 and the bearing hole 6, and the dimensional accuracy of the bearing 10 itself is not considered. The errors included in the distance A include a processing error in the bearing hole 6, a distance error in processing from the processing reference to the center of the head mounting hole 7, a processing error in the head mounting hole 7, and the like. All of these errors are generated by combining the errors in all the carriages as long as the individual carriages are mass-produced.

On the other hand, in the actuator shown in the first embodiment of the present invention, factors including errors are greatly reduced as compared with the conventional actuator. Assuming that the distance from the center of the bearing unit 110 to the center of the head mounting hole 107 in the actuator of FIG. 5 is B, the error included in the distance B is compared under the same conditions as the conventional actuator of FIG. At the time of manufacturing the actuator of the first embodiment, the bearing hole 106 of the carriage 114 manufactured by die casting or the like is formed with relatively low precision in its size and position. The inner diameter of the bearing hole 106 is the bearing unit 1
It is sufficient if it is formed larger than the outer diameter of the bearing hole 10.
The dimensional accuracy of 06 does not need to be high. Further, the position of the head mounting hole 107 is determined by the distance from the reference position or the bearing hole 10.
It is not necessary to set the relative position with respect to 6 with high precision, and the head mounting hole 107 can be positioned independently with a certain margin. However, the processing error of the head mounting hole 107 is the same as that of the conventional example shown in FIG.

The carriage 114 formed by die-casting as described above is arranged in a mold together with the bearing unit 110. The positioning of the carriage 114 in the mold at this time is performed by a positioning pin 137 inserted into the head mounting hole 107. The positioning of the bearing unit 110 in the bearing hole 106 is determined by the relative position with respect to the positioning pin 137 engaged with the head mounting hole 107. The bearing unit 110 is held and positioned by a bearing holding mechanism constituted by irregularities formed in a mold. The bearing unit 110 thus arranged in the mold is arranged with a certain gap with respect to the bearing hole 106. The gap is filled with a filler to form the holding layer 111.

In the case of the actuator of Embodiment 1 formed as described above, the error included in the distance B from the center of the bearing unit 110 to the center of the head mounting hole 107 includes:
Includes: The errors include a holding error of the bearing unit 110 in the mold, a distance error from a holding position of the bearing unit 110 in the mold to the center of the positioning pin 137, a center of the positioning pin 137 and a center of the head mounting hole 107. Displacement and head mounting hole 107
Processing error. However, among the above errors, the holding error of the bearing unit 110 and the distance error from the holding position of the bearing unit 110 to the center of the positioning pin 137 are as follows:
Basically, it is determined based on the accuracy at the time of manufacturing the mold, and is not an error generated in each carriage 114 at the time of mass production. Therefore, these errors are not such that individual numerical values are statistically dispersed.

With respect to the conventional actuator (FIG. 4) configured as described above and the actuator of the first embodiment (FIG. 5), factors that cause an error are compared by the inventors' research and experiments. Will be described. The position error due to machining in the mass production of the bearing hole 6 in the conventional actuator is caused by the cylindricity, verticality, roundness, coaxiality, and the like of the bearing hole 6, and is statistically dispersed in each product. The positional accuracy of the bearing 10 which is press-fitted into the machined bearing hole 6 is determined by the cylindricity, verticality, roundness, and concentricity of the bearing hole 6. On the other hand, Example 1
The positional accuracy of the bearing unit 110 in the actuator described above is determined by the processing accuracy of the mold. According to the study of the inventors, it has been found that the positional accuracy of the bearing unit 110 in the actuator according to the first embodiment is much higher than the accuracy of the bearing 10 fixed by press fitting in the related art.

In the manufacture of the actuator according to the first embodiment, the distance error from the center of the bearing unit 110 held in the mold to the positioning pin 137 is determined by the processing accuracy in manufacturing the mold. Regarding this distance error, the actuator of Example 1 was formed smaller and more accurately than the conventional actuator which is individually processed and manufactured. According to the researches and experiments of the inventors, the distance error from the bearing mounting hole 6 of the actuator manufactured by the conventional manufacturing method to the head mounting hole 7 machined with the reference position as the reference position is equal to that in the first embodiment. Is worse than the distance error from the bearing unit 110 held in the head mounting hole 107 with which the positioning pin 137 is engaged. The reason for this is that the error unique to the mold, which is determined at the time of manufacturing the mold, is gradually and precisely refined by correcting the mold based on the result measured after the bearing fixing step in the manufacturing method of the first embodiment. It can be easily modified and, as a result, can be mass-produced with much higher accuracy than conventional manufacturing methods.

Since the machining accuracy of the head mounting holes in the actuators of the first embodiment and the conventional example is basically the same, there is no difference between the two. Further, the deviation between the center of the head mounting hole 107 in the first embodiment and the center of the positioning pin 137 inserted into the head mounting hole 107 is not included in the manufacturing method of the conventional example, but is included only in the manufacturing method of the first embodiment. It is. However, it has been confirmed that even the actuator of Example 1 manufactured in a state including such a deviation has extremely high accuracy and few errors as compared with the conventional example. The above-described accuracy comparison discusses actual accuracy comparison during mass production of about one million swing type actuators per month. Therefore, the above discussion does not apply when individually machined with very high precision. However, actuators machined in this way are not suitable for mass production and cannot be reduced in price. Therefore, comparison with such a special actuator is meaningless, and it is necessary to compare with a swing type actuator mass-produced as described above. According to the manufacturing method of the actuator of the present invention described in the first embodiment, it is very effective at the time of actual mass production, it is possible to achieve a low price by a simple method, and to realize the manufacture of a high-precision actuator. it can.

The actuator according to the first embodiment of the present invention is configured to absorb a precision error by a gap formed between the bearing unit 110 and the bearing hole 106 in the mold at the time of manufacturing. It is possible to more easily realize a higher-precision actuator than a conventional actuator. Therefore, the distance B between the two points shown in FIG. Although the shape of the bearing hole 106 in the actuator according to the first embodiment of the present invention has been described as an example of a cylindrical shape, the present invention is not limited to this shape. In the first embodiment, since the filler is filled between the bearing unit 110 and the bearing hole 106 in the mold to fix the bearing unit 110, the shape of the bearing hole is determined by the gap between the bearing and the bearing. Any shape may be used as long as it can be filled with a filler.

In the first embodiment, the bearing unit 1
Although one bearing is illustrated and described as 10, the present invention can be applied to a bearing mechanism of any configuration (such as a combination of a plurality of bearings). It is effective. Further, in the present invention, the present invention is applicable even if one or a plurality of bearing mechanisms such as a bearing, a rotating shaft, and a bearing holding unit are integrally formed. Such a configuration reduces the number of parts. And the effects of the invention can be further exhibited.

Further, in the first embodiment, since the bearing unit 110 is configured to be fixed by the filler, the resonance frequency in the actuator mounted state can be changed by changing the rigidity of the filler. . In a hard disk drive (HDD), it is an important issue to suppress a phenomenon in which a head hits a recording medium (head slap phenomenon) when an impact is applied. In the actuator according to the first embodiment, the head slap phenomenon can be suppressed and the shock resistance of the actuator can be improved by adjusting the resonance frequency of the entire actuator with the head attached.

The adjustment of the resonance frequency is considered in combination with various factors such as the design of the arm, the weight of the head, and the characteristics of a thin metal plate called a suspension to which the head is attached. In the configuration of the first embodiment, the resonance point of the portion that supports the entire actuator can be changed by changing the rigidity when the filler is solidified (the protective layer 111). By changing the resonance point, the resonance frequency of the entire actuator can be adjusted. As described above, changing the rigidity of the protective layer 111 is a very effective means for improving impact resistance.
At this time, even if the rigidity of the filler is changed to change the rigidity of the actuator in the direction in which the head hits the recording medium, the rigidity in the swinging direction of the actuator matches the rotational direction of the bearing, so that stress is not applied in that direction. It does not affect the swing of the actuator. Therefore, according to the configuration of the first embodiment, even if the rigidity of the filler is changed to improve the head slap resistance, the rigidity in the swing direction of the actuator does not change, and high-speed access at a high input frequency is possible. become.

In the above embodiment, when a non-conductive material such as ordinary resin is used as a filler for fixing the bearing unit, electrical conduction between the carriage and the bearing unit cannot be obtained. There is a problem that static electricity generated in the carriage cannot be leaked via the bearing unit. In this case, the above problem can be solved by using a component made of a conductive material such as a metal to obtain a continuity between the carriage and the bearing unit. In this case, as a component for obtaining conduction between the carriage and the bearing unit, a metal screw, a metal pin, a metal plate, a wire, a solder, or the like is used.

Embodiment 2 Embodiment 2 of the actuator according to the present invention will be described below with reference to the accompanying drawings. FIG. 6 is a perspective view illustrating an example of the configuration of the actuator according to the second embodiment, and FIG. 7 is a perspective view illustrating another example of the actuator according to the second embodiment. The actuator according to the second embodiment includes a bearing 101 that holds a pivot shaft for swinging movement at the center thereof and an arm protruding laterally from one side wall of the bearing 101, as in the first embodiment. Part 102 and bearing part 10
Coil part 1 arranged to protrude from the other side wall of
03. Also, this coil part 10
3 is provided with a coil 104 and a terminal pin 105, and is configured to be arranged in a magnetic circuit.

In the actuator according to the second embodiment, a holding part 212 made of a filler is formed for attaching and holding a part of the bearing part 101 to the bearing unit 210. The holding portion 212 has a plurality of wiring fixing holes 209 for fixing wiring for guiding signals from the head. The holding part 212 is formed by filling a mold with a filler at the time of manufacturing. A mold for forming a required shape in the holding portion 212 such as the wiring fixing hole 209 is added to the mold in advance. Therefore, when the carriage of the actuator according to the second embodiment is manufactured, the arm unit 102, a portion other than the holding unit 212 of the bearing unit 101, and the bearing unit 210 are arranged in a mold, and a desired amount of filler is filled. The holding part 212 can be formed. Thus, in the actuator of the second embodiment, the bearing 1
The step of drilling No. 01 is not required, and the manufacturing process can be simplified.

FIG. 7 is a perspective view showing another example of the swing type actuator of the second embodiment. The actuator shown in FIG. 7 is the same as the actuator shown in FIG. 6 except for the shape of the holding portion 212 of the actuator. In the actuator of FIG. 7, a part of the bearing part 101 and a part of the arm part 102 are formed by filling a mold with a filler. Assuming that the portion formed by the filler is a holding portion 238, the holding portion 238 has a function of attaching and holding the bearing unit 110, and has a wiring fixing hole 209, a positioning portion for assembling the actuator in the arm portion 102, and the like. Has a hole 213 used for Therefore, the shape of the holding portion 238 shown in FIG. 7 can be formed by forming a shape corresponding to the shape in a mold in advance and filling the filling material. As a result, the number of manufacturing steps can be further reduced.

In the example shown in FIGS. 6 and 7, an example is shown in which the wiring fixing hole 209 of the bearing part 101 and a part of the arm part 102 are formed by a filler, but a desired shape is previously formed in a mold. By filling the filling material, the carriage of any shape can be formed. In particular, component mounting holes, ribs, and the like required for the bearing portion 101 and the arm portion 102 can be formed by forming a mold corresponding to the shape in advance in a mold and filling the mold with a filler. With such a manufacturing method, the number of manufacturing steps can be further reduced. In the second embodiment illustrated in FIGS. 6 and 7, an example in which a part of the bearing unit 101 and the arm unit 102 which are conventionally formed of a metal material such as aluminum is replaced with a filler material is described. In the present invention, a mold for filling the filler is formed in a desired shape in advance, and the bearing 101 and the arm 102 are formed, or both of them, that is, the entire carriage is formed of the filler. It is also possible.

Embodiment 3 Embodiment 3 of the actuator according to the present invention will be described below with reference to the accompanying drawings. 8 to 10 are perspective views illustrating an example of the actuator according to the third embodiment. 11 and 12 are perspective views showing another example of the arm component in the actuator according to the third embodiment. The actuator according to the third embodiment includes, as in the first embodiment, a bearing portion that holds a pivot shaft for swinging operation at a central portion thereof, and an arm portion that projects laterally from one side wall of the bearing portion. , And a coil portion arranged to protrude from the other side wall of the bearing portion. FIG. 8 illustrates an example of the arm component 315 in the actuator according to the third embodiment. The arm component 315 is formed of a metal material such as aluminum or a resin material such as engineering plastic. In particular, when a metal material is used, the arm component 315 can be manufactured by press working from a plate-like material or the like, and has a feature that it can be mass-produced with an inexpensive conductive material.

As shown in FIG. 8, near the one end of the arm part 315, a bearing hole 306 in which a rotation shaft for rotating and swinging the actuator is arranged is formed. A head mounting hole 307 is formed near the other end of the arm component 315. The position of the bearing hole 306 in the third embodiment does not need to be accurate to dispose the bearing unit 310 at an accurate position, similarly to the bearing hole 106 (FIGS. 1 and 2) described in the first embodiment. . The bearing hole 306 may have an inner diameter slightly larger than the outer diameter of the bearing to be inserted, and may have any shape including a position where the bearing is to be arranged. With such a configuration, the gap between the bearing hole 306 and the bearing is filled with the filler, and the bearing and the arm component 315 are fixed.

9 and 10 show an actuator formed by stacking three arm parts 315 shown in FIG. 8, and FIG. 9 is a perspective view of the actuator.
FIG. 10 is a cross-sectional view of the bearing unit 101. In the actuator shown in FIG. 9, an example is shown in which three arm parts 315 are used to form the arm part 102, but the present invention is not limited to this number, but may be modified according to the specifications of the hard disk drive. The number is determined. In the actuator of this embodiment, in a manufacturing state, a predetermined number (three in this embodiment) of arm parts 315 are arranged in a stacked state at a predetermined position in a mold, and a bearing unit 310 is provided.
Are arranged at predetermined positions and the filler is filled. At this time, each of the arm parts 315 and the bearing unit 310 are fixed at predetermined positions, and each is fixed by the solidified filler. The filler is solidified to form the holding portion 318. As shown in FIG. 10, a plurality of engagement holes 344 are formed in each arm component 315, and the engagement holes 3
The solidified filler enters into 44, and each arm part 31
5 and the holding portion 318 are firmly fixed, and the arm component 315 is prevented from coming off.

FIG. 11 is a perspective view showing another arm part 317 of the actuator according to the third embodiment. A bearing hole is not formed in the arm part 317 shown in FIG. Even with the arm component 317 formed in this way, the actuator of the present invention can be implemented. Also,
The arm component 317 of FIG. 11 also has a plurality of engagement holes 344 that allow the filler to enter and strengthen the fixed state. FIG. 12 is a perspective view showing an arm part assembly 345 of the actuator according to the third embodiment. As shown in FIG. 12, the arm part assembly 345 has a plurality of (three) arm parts 319 connected by a sleeve 316. The sleeve 316 is engaged with a bearing hole 306 of a separate arm part 319. FIG. 13 shows FIG.
FIG. 10 is a cross-sectional view of the bearing unit 101 when an actuator is manufactured using the second arm component assembly 345. As shown in FIG. 13, a bearing hole 306 in each arm part 319 is provided.
Are different from each other, and the outer shape of the sleeve 316 is formed so as to have a step in accordance with the different inner diameter.

The arm part assembly 3 configured as described above
45 is held in the mold together with the bearing unit 110, and the filler is filled to form the holding portion 318. FIG.
As shown in FIG. 3, a plurality of engagement holes 344 are formed in each arm part 319, and the solidified filler enters into the engagement holes 344, and each arm part 319 and the holding part 31 are formed.
8 is firmly fixed. Figures 12 and 1
The actuator having the configuration shown in FIG.
9 are assembled at a predetermined interval by the sleeve 316, so that there is no need to provide a complicated holding mechanism for combining and holding the respective arm parts in the mold at the time of manufacturing, and the manufacturing process is simplified. Can be achieved. As a method of combining a plurality of arm parts, a method other than using the sleeve 316 as described above may be used, as long as it can be preliminarily temporarily assembled before filling the filler in the mold.

In the third embodiment, even when an arm part without a bearing hole as shown in FIG. 11 is used, the shape of the arm part on the side fixed to the bearing part is changed.
The effects of the present invention can be achieved if the bearings are configured so that they can be simultaneously fixed by a filler. Further, in the third embodiment, an example in which a plate-shaped component is used as the arm component has been described. However, even when an arm unit in which a plurality of arms are integrally formed by a die casting method is used, the arm If the filler is used to fix the unit and the bearing at a desired position of the bearing portion, the effect of the present invention can be sufficiently exerted.

Embodiment 4 Hereinafter, a swing type actuator according to Embodiment 4 of the present invention will be described with reference to the accompanying drawings. 14 to 23 are perspective views showing various examples of arm components in the actuator according to the fourth embodiment. Example 4
Is the same as in the first embodiment,
A bearing portion for holding a pivot axis of the swing operation at a central portion thereof,
It is composed of an arm projecting laterally from one side wall of the bearing, and a coil arranged so as to project from the other side wall of the bearing.

In the actuator of the fourth embodiment, the holding layer 411 for holding the bearing unit 410 in the bearing hole 406 is formed of a filler as in the above-described embodiment, and the coil 404 and the terminal pin arranged in the coil portion 103 are formed. 405 is fixed by the filler 421. Therefore, in the fourth embodiment, the bearing unit 410, the coil 404, and the terminal pin 405 are fixed to the mold at the time of manufacture by a filler that has been filled and solidified. Thus, in the actuator according to the fourth embodiment, the assembling process can be further simplified as compared with the above-described embodiment. In the actuator according to the fourth embodiment, the bearing unit 410, the coil 404, and the terminal pin 405 are fixed by a filler while being held in the mold, and the relative positions of those elements in the bearing 101 and the arm 102 are set. Can be held at a high precision level in accordance with the mold precision. As a result, each element in the completed actuator is arranged at a desired position with high accuracy.

FIG. 15 is a perspective view showing another example of the actuator of the fourth embodiment. As shown in FIG. 15, in this actuator, similarly to the actuator of FIG. 14, the bearing unit 410, the coil 404, and the terminal pin 405 are fixed in a mold at the time of manufacture by being filled and solidified. In the actuator shown in FIG.
A holding layer 411 formed of a filler in the bearing portion 101 and a filler 439 for fixing the coil 404 and the like are provided in a communicating portion 419.
Has a structure connected by Thus, FIG.
In the actuator 5 of FIG.
6 (a holding layer 41)
1) and a filler for fixing the coil 404 and the terminal pin 405 are connected by a communication portion 419. By having this structure, the actuator can be formed even when there is only one filling port for filling the filler in the mold. In the manufacture of the actuator shown in FIG. 15, all the components are filled by filling the filler with the coil 404, the terminal pin 405, the bearing unit 410, the bearing 101, and the arm 102 fixed in the mold. Elements can be fixed together with high precision.

Next, a specific structure of the actuator shown in FIG. 15 will be described with reference to FIGS. 16 to 20 each show the shape of the arm component in the actuator, where (a) is a left side view and (b) is a plan view. The arm part 430 in the actuator shown in FIG. 16 has a communicating part 419A for connecting the holding layer and the filler formed at the upper and lower left ends of the arm part 430. An arm part 431 in the actuator shown in FIG. 17 has a communication part 419B for connecting the holding layer and the filler,
1 is formed at the left end and is connected vertically.
Arm part 43 in actuator shown in FIG.
2 is a communication part 419C connecting the holding layer and the filler,
The arm part 432 is formed at the upper and lower central portions of the left end. The arm part 433 in the actuator shown in FIG. 19 is a communication part 4 connecting the holding layer and the filler.
19D are formed at two places on the left end of the arm component 433. In the arm part 434 of the actuator shown in FIG. 20, half of the bearing hole 406E in which the bearing is arranged is open, and a portion connecting the holding layer and the coil part 103 is formed of the filler 419E. An example of an actuator using the arm component 434 of FIG. 20 is shown in a perspective view of FIG. As shown in FIG. 21, about half of the bearing portion 101 of this actuator is formed of a filler 419E, and the filler 419E fills the holding layer 411 for holding the bearing unit 410 at a predetermined position and the filling of the coil portion 103. It is connected to things.

As described above, the actuator according to the fourth embodiment has a structure in which the filler necessary for fixing the coil and the like of the coil portion 103 and the filler of the bearing portion 101 are connected to the communicating portion. . The present invention is not limited to the above-described configuration, and has a configuration in which the filler between the coil portion 103 and the bearing portion 101 is connected regardless of the shape of the communicating portion. If so, the bearing unit 410, the coil 404, and the terminal pin 405 can be simultaneously fixed in a correct position by the filler material.

In the fourth embodiment, it is necessary to dispose in advance the carriage having the bearing portion 101 and the arm portion 102, the bearing unit 410, the coil 404, and the terminal pin 405 in the mold. However, when a plurality of elements are temporarily assembled (preliminarily fixed) with resin or the like, each element can be more easily and accurately arranged when the elements are arranged in the mold. By performing the preliminary fixing in this manner, productivity is improved, and in particular, there is an effect that each element can be accurately arranged in a mold at a time by a robot or the like automated in mass production. It is necessary to select a material or structure that can be fine-tuned so that the mutual distances and positions of the temporarily assembled elements are in a normal position in the mold as a material such as a resin used as a temporary assembly for preliminary fixing. There is.

In the fourth embodiment, what is fixed simultaneously in the mold is the coil 404 and the terminal pin 405.
And the bearing unit 410, but it is also possible to arrange all the elements to be attached to the actuator in the mold in advance. Thus, in the actuator of the present invention, parts to be attached to the actuator are attached at a time by filling the mold with the filler. Components to be attached to this actuator include flexible printed wiring boards, printed wiring boards, connectors, metal pins,
Screws, screws, nuts and the like. Note that only the coil 404 may be fixed together with the bearing unit 410 in the mold. In the case of such a configuration, the winding end of the coil 404 is in a state of being directly derived from the filler.

Further, the mold used for filling the filler is provided with a stopper for regulating the swing range of the movable coil, a lock device for fixing the actuator when reading / writing is not required, and a signal from the head. It is possible to provide a mechanism for fixing the flexible printed wiring board for transmission and a mechanism for forming a wiring fixing hole or the like in advance, and to form the various mechanisms with a filler. By forming each element with the filler in the mold in this way, there is an effect that the mechanism and the shape can be formed at once by a simple manufacturing method.

In the fourth embodiment, since the coil portion 103 is formed of a filler together with the holding layer of the bearing portion 101, the coil portion 1
03 is precisely arranged at a desired position. Next, in Embodiment 4, a basic mechanism in which the coil portion 103 is arranged with high accuracy with respect to the bearing unit 110 will be described in comparison with a conventional example. In the following description, the center X of the bearings 10, 110 arranged in the bearing portions 1, 101,
The accuracy of the relative position with respect to an arbitrary position Y which is substantially the center of the coil units 3 and 103 will be described as an example. FIG. 22 is a plan view showing a conventional actuator. This conventional actuator has a bearing 1, an arm 2, and a coil 3. The carriage is constituted by the bearing 1 and the arm 2. A bearing hole 6 is formed in the bearing portion 1, and a bearing unit 10 is fitted into the bearing hole 6.

The coil portion 3 of the conventional actuator shown in FIG. 22 is formed by an injection molding method using a resin material which has been frequently used in recent years. The coil portion 3 is configured by fixing a coil 4 and a terminal pin 5 to a resin 42. Also, this conventional actuator has a coil 4
After the terminal pin 5 and the terminal pin 5 are fixed, the bearing 10 is press-fitted into the bearing hole 6 and fixed in another step. FIG. 23 is a plan view illustrating an actuator according to a fourth embodiment of the present invention. The actuator according to the fourth embodiment includes a bearing 101, an arm 1
02, and a coil unit 103, and a carriage is constituted by the bearing unit 101 and the arm unit 102. FIG.
The actuator according to the fourth embodiment shown in FIG. 4 is a bearing unit 4 held at a predetermined position in a mold at the time of manufacture.
10, the coil 404, and the terminal pin 405 are formed by filling a filler 439. Therefore, the bearing unit 41
0 is fixed at a predetermined position in the bearing hole 406 and the coil 40
4 and the terminal pin 405 are fixed at predetermined positions of the coil portion 403.

The coil portion 403 in the fourth embodiment
Shows an example manufactured by an injection molding method.
Also in the case of a configuration in which the terminal pins 04 and the terminal pins 405 are directly bonded to the bearing portion 101 with an adhesive, the same effect as in the fourth embodiment can be obtained. This is because the bearing unit 41
0, the coil 404, and the terminal pin 405 are simultaneously held at a predetermined position in the mold with high precision, and the gap between the respective elements inside the mold is filled with the filler 439, and each is fixed. It is.

The conventional carriage shown in FIG. 22 and the carriage of the fourth embodiment shown in FIG. 23 are both manufactured by die-casting or extrusion using a metal material such as aluminum. Further, in the conventional example shown in FIG. 22, it is assumed that the bearing hole 6 is formed by die-casting or extrusion, and the hole is further mass-produced by machining (lathing, machining, etc.).
In the conventional example, in order to integrally form the coil 4 and the terminal pin 5 with a metal material carriage by an injection molding method using a resin, the carriage, the coil 4 and the terminal pin 5 are arranged in a mold and filled. The material is filled and molded. At this time, the carriage in the mold was positioned by engaging the bearing hole 6 and the head mounting hole 7 with a positioning pin provided in the mold in advance. Therefore, since the coil 4 is positioned with respect to the bearing hole 6, the position of the bearing hole 6 needs to be formed with high accuracy.

On the other hand, in the fourth embodiment, the positioning of the carriage is determined by engaging the positioning pins with the head mounting holes 407 as described in the first embodiment. However, in the fourth embodiment, since the bearing unit 410 is independently held in the mold, the bearing unit 410 is arranged without depending on the bearing hole 406. Also, the coil 404 and the terminal pin 40
Numerals 5 are arranged at predetermined positions in the mold, respectively, and the gap between these elements and the carriage is filled with a filler to fix all the elements.

Conventional example manufactured as above and Example 4
Consider the position accuracy in the actuator of FIG. In the conventional actuator shown in FIG. 22, the distance from the center X of the bearing to the center Y of the coil of the coil section 3 is represented by C.
And In the actuator according to the fourth embodiment shown in FIG. 23, the distance from the center X of the bearing to the center Y of the coil of the coil unit 403 is D. The following is a consideration of the distance C of the conventional example and the distance D of the fourth embodiment.

First, considering the dimensional accuracy of the distance C in the conventional example, the positional accuracy of the bearing hole 6 itself is low.
The positional accuracy of the center of the bearing 10 attached to the bearing hole 6 is low. Further, since positioning in the mold is determined by engaging a positioning pin with the hole, the bearing hole 6 is further determined.
Is displaced. Therefore, even if the mold is manufactured with high accuracy, the distance C from the center X of the bearing to the center Y of the coil can be obtained.
Are not constant but vary. On the other hand, in the fourth embodiment, the bearing unit 410 and the coil 4
04 and the terminal pins 405 are held at predetermined positions with high precision. For this reason, the distance accuracy between the respective elements all depends on the dimensional accuracy in the mold,
It is within the processing error at the time of mold production. Therefore, by manufacturing the mold with high accuracy, the distance D from the center X of the bearing to the center Y of the coil can be reliably set within the allowable range.

According to the researches and experiments conducted by the inventors, the arrangement of the coil and the terminal pin was held in the same manner as in the fourth embodiment and the conventional example, so that there was no difference between the arrangements. However, the positional accuracy of the bearing center X of the bearing unit 110 disposed at a predetermined position in the mold is different from that of the bearing center X when the bearing 10 is press-fitted and fixed in the bearing hole 6 formed in advance as in the conventional example. It was confirmed that the position accuracy was several steps better. Comparing the position error of the actuator of Example 4 with the position error of the conventional example, it was confirmed that the position error of Example 4 was much better than the conventional example. Similarly to the position error described in the first embodiment, the position error in the fourth embodiment is determined by the processing accuracy in manufacturing the mold. Therefore, in the fourth embodiment, there is no individual variation during mass production by using a high-precision mold. For this reason, in the manufacturing method according to the fourth embodiment, it is possible to correct the mold based on the result of the measured dimensions of the first manufactured product, and further improve the positional accuracy in the product. As described above, since the actuator is manufactured in the fourth embodiment, the positional accuracy of each element is greatly improved as compared with the conventional example.

The consideration of the accuracy comparison made by the inventors with respect to the actuator of the fourth embodiment discusses the actual accuracy comparison when mass-producing a rocking type actuator of about one million per month. It is. Therefore, if an arm part machined as a single piece with extremely high precision is used as a conventional example, a result different from the above may be obtained, but the comparison result is meaningless and is subject to another discussion. Become. For this reason, it is difficult to perform the above-described accuracy comparison using specific numerical values. As described above, the manufacturing method of the actuator according to the fourth embodiment is a very effective method in mass production, can reduce the manufacturing cost, and can mass-produce high-precision products by a simple method. The manufacturing method of the actuator according to the fourth embodiment of the present invention includes:
Due to the filler formed around the bearing unit 41,
The present invention proposes a method that can easily absorb a precision error of 0 and can be realized more easily than the conventional method. Bearing unit 41 basically realized by the present invention
0 and the coil portion 103 are positioned in the head mounting hole 40.
7 does not depend at all on the precision.

Fifth Embodiment A fifth embodiment of the actuator according to the present invention will be described below with reference to FIGS. 14 and 15 used in the description of the fourth embodiment. In the actuator of the fifth embodiment, the material of the filler is specified. FIG.
In the actuator of the fifth embodiment shown in FIG.
A holding layer 411 made of a filler is formed in a gap between the bearing hole 406 of No. 01 and a side cylindrical portion of the bearing unit 410 inside the bearing hole 406. In the coil part 103, the coil 404 and the terminal pin 405 are fixed to the bearing part 101 by a filler 421 made of a filler.

The material of the filler 421 for fixing the coil 404 and the terminal pin 405 preferably has a high insulating property to avoid an electrical short circuit between the terminals. on the other hand,
As a filler for fixing the bearing unit 410 in the bearing hole 406, it is preferable to use a conductive material. This is because, particularly in the case of an actuator used for a hard disk or the like, static electricity generated between the arm portion and the disk-shaped recording medium rotating near the arm portion is leaked through the bearing unit 410.

As described above, the filler of the holding layer 411 for fixing the bearing 410, the coil 404 and the terminal pin 4
By separately configuring the types of the filler 421 and the filler 421 for fixing the material 05, it is possible to select a material having characteristics according to the requirements of each place of use. In addition,
As the filler used in the holding layer 411 of the actuator of the fifth embodiment, any conductive filler can be used. In particular, bearing 4
A filler of a metal material or a conductive resin is preferable because it can be filled in a narrow space between the bearing 10 and the bearing hole 406, is easy to handle, is low in cost, and has high productivity. For example, in the case of a metal material, aluminum, magnesium and the like are effective. Generally, a resin material as a filler is non-conductive, and thus carbon fibers, graphite fibers, carbon black, metal fibers, metal flakes, etc. are appropriately mixed into the resin material, and its electric resistance (physical property value) is mixed.
Change and use.

In the actuator shown in FIG. 14, the filler of the coil portion 103 and the filler of the bearing portion 101 are separated, and fillers having different properties are used. However, the present invention is not limited to such a configuration, and is also applicable to, for example, the configuration of the actuator shown in FIG. In the actuator shown in FIG. 15, the filler of the coil part 103 and the filler of the bearing part 101 are connected by the communication part 419. Even in this case, it is sufficient that a part of the bearing unit 101 and the bearing unit 410 be electrically connected to each other by using a highly insulating material as the filler. Therefore, the conductive resin material does not necessarily need to cover the entire periphery of the bearing unit 410. For example, if the electrical characteristics between the bearing unit 101 and the bearing unit 410 are to be changed, it is only necessary to short-circuit a part.

In the fifth embodiment, an example is shown in which the filler is selectively used depending on the necessity of conductivity at the place of use. By properly using the filler in this manner, especially for the filler for fixing the bearing, by appropriately selecting physical properties such as hardness and vibration damping property, the arm portion 1 is formed.
02 can be changed, and especially when incorporated in a hard disk drive, etc.
The impact resistance and head slap resistance of the device itself can be improved. In selecting the hardness of the filler, the resonance frequency can be increased by increasing the hardness relatively, and the resonance frequency can be decreased by decreasing the hardness.

Embodiment 6 An actuator according to Embodiment 6 of the present invention will be described below with reference to the accompanying drawings. FIG. 24 and FIG. 25 are a perspective view and a sectional view showing a bearing unit 610 in a swing type actuator according to a sixth embodiment of the present invention. The bearing unit 610 is the same as that of the first embodiment.
In the same manner as in the above, the actuator is fixed to the bearing hole of the bearing portion by a filler holding layer in order to swing the actuator. FIG. 26 is a cross-sectional view showing a state where the bearing unit 610 is fixed to the bearing portion 101 of the actuator. As shown in FIG. 26, a side cylindrical surface 628 of the bearing unit 610 and a bearing hole 6 formed in the bearing portion 101 held in a mold.
Filler is filled in a gap between the holding layer 611 and the holding layer 611.

As shown in FIG. 25, steps 626 are formed at two upper and lower portions in a bearing holding portion 625 constituting the outer surface of the bearing unit 610 of the sixth embodiment. Thus, the step 62 is formed on the side cylindrical surface 628 which is the outer surface of the bearing unit 610.
The formation of 6, prevents the bearing unit 610 from coming off from the bearing hole 606 as can be understood from FIG. In the above-described sixth embodiment, the shape in which the side cylindrical surface 628 of the bearing unit 610 is stepped has been described. However, the present invention is not limited to this configuration. By forming a bent portion which is substantially uneven such as a hole, a depression, a projection, or the like, the filler is fixed to the surface of the bent portion as in the sixth embodiment, and the retaining of the bearing unit 610 is prevented. You.

In the sixth embodiment, the bearing unit 610
Has been described as including the bearing 623, the shaft holding portion 624, and the bearing holding portion 625. In the sixth embodiment, by using the bearing unit 610 in which the bearing 623, the shaft holding portion 624, and the bearing holding portion 625 are integrally assembled, a rotating mechanism for rotating and swinging at a time in the manufacturing process is used. It has the effect of being completed. The present invention is not limited to the bearing unit having such a configuration, and any configuration may be used as long as the bearing that enables the rotation and swing of the actuator is securely fixed at a predetermined position and has a function of preventing slipping.

In the sixth embodiment, the bearing holding portion 625 forms a wall surface that directly contacts the filler while holding a plurality of bearings, and a step 626 formed on the side cylindrical surface 628 of the bearing holding portion 625. This prevents the bearing unit 610 from falling off and prevents the filler from entering the bearing 623 itself or the vicinity of the rotating shaft. In the sixth embodiment, the bearing unit 610 has a configuration in which the bearing holding portion 625, the bearing 623, and the shaft holding portion 624 are integrally assembled. However, the present invention is not limited to this configuration. Absent. For example, it is also possible to form a bent portion such as unevenness on the outer surface of the bearing 623 itself without providing the bearing holding portion, and to have a function of holding the rotating shaft and preventing the rotating shaft from coming off. With such a configuration, the effects of the present invention can be achieved with only the configuration of the bearing 623.

FIGS. 27 and 28 are sectional views showing another example of the bearing unit in the actuator of the sixth embodiment. In a bearing unit 610 shown in FIG. 27, a plurality of projections 646 are formed radially on the side cylindrical surface. The bearing unit 610 is temporarily assembled in the bearing hole 606 by the projection 646. Each of the protrusions 646 provided on the side cylindrical surface of the bearing unit 610 shown in FIG. 27 is formed so that the tip thereof contacts the inner wall of the bearing hole 606. This projection 646
Is formed of an elastic material and has a certain degree of flexibility.
Therefore, as shown in FIG. 27, when the bearing unit 610 is inserted into the bearing hole 606, the tip of the projection 646 comes into contact with the inner wall of the bearing hole 606, and the bearing unit 61
0 is held in the bearing hole 606. By holding the bearing unit 610 in the bearing hole 606 in this manner,
At the stage before mounting on the mold, temporary assembly (preliminary fixing) can be performed. Thus, the bearing unit 610
Has an effect that the bearing unit 610 can be easily arranged in the mold.

FIG. 28 is a sectional view showing still another example of the bearing unit in the actuator of the sixth embodiment.
As shown in FIG. 28, between the side cylindrical surface of the bearing unit 610 and the inner surface of the bearing hole 606, a plurality of supports 647 longer than the distance therebetween are radially arranged. The support 647 is made of an elastic material such as a resin material or a rubber material and is manufactured separately from the bearing unit 610 by an inexpensive and simple method. The support 647 is connected to the bearing unit 610 and the bearing hole 60.
6, the bearing unit 61
0 is temporarily assembled in the bearing hole 606.

As shown in FIG. 28, by using the support 647, each element can be disposed in the mold at a time in a temporarily assembled state, so that productivity can be improved. In particular, when mass production is performed using an automated robot or the like, since each element can be arranged in a mold at once, a great effect is achieved. The protrusion 646 shown in FIG. 27 and the support 647 shown in FIG. 28 may be made of a flexible material or structure so that the positions of the respective elements can be adjusted to appropriate positions when temporarily assembled in a mold. desirable. When the projection 646 or the support 647 is used, the projection 64 is previously formed using an elastic resin or the like.
6 and the support body 647 are formed in advance, and the formed body is attached to a bearing unit, inserted into the bearing hole 606, and temporarily assembled. An actuator is manufactured by filling the filler in this temporary assembly state. By manufacturing the actuator in this manner, the steps in the method of manufacturing the actuator are simplified, and the efficiency is greatly increased.

Embodiment 7 Hereinafter, an actuator according to a seventh embodiment of the present invention will be described with reference to FIGS. FIG. 29 is a sectional view showing a part of a mold 727 for manufacturing the actuator of the seventh embodiment. As shown in FIG. 29, a bearing unit 710 and a bearing unit 101 of an actuator are fixed in a mold 727. The side cylindrical surface 72 of the bearing unit 710 fixed in the mold as described above.
The gap between the bearing 8 and the bearing hole 706 of the bearing portion 101 held in the mold is filled with a filler to form a holding layer 711. As shown in FIG.
A projection-shaped bearing holding portion 729 is formed on both upper and lower surfaces so that the bearing unit 710 is held at a predetermined position inside the inner surface 6. The bearing holding portion 729 is formed as an engaging portion, for example, a plurality of protrusions or an annularly protruding shape from the inner surface of the mold 727. The inner diameter of the bearing holding part 729 substantially matches the outer diameter of the bearing unit 710 so that the bearing holding part 729 is fitted with the bearing unit 710.

As the mold 727 used, a mold for injection molding or compression molding is suitable. When the mold 727 is closed, the bearing unit 710 and the carriage fixed inside the mold need to be precisely held at predetermined positions. In particular, the bearing unit 710 needs to be precisely arranged at a predetermined position inside the bearing hole 706 of the bearing unit 101. Therefore, a bearing holding portion 729 is formed in the mold shown in FIG. Also,
This mold is provided with a positioning function for fixing the bearing portion 101 and the arm portion 102 of the carriage constituting the actuator at predetermined positions, and a positioning pin (not shown). In the mold shown in FIG. 29, the gap between the bearing hole 706 of the bearing unit 101 held in the closed mold and the side cylindrical surface 728 of the bearing unit 710 can be filled with a filler. It has a structure.

According to the seventh embodiment of the present invention, the gap between the outer surface of the bearing unit 710 held in the mold and the inner surface of the bearing hole 706 is filled with the filler, so that the bearing unit 710 is maintained at a predetermined position. It can be accurately fixed in position. According to the present invention, the same effect can be achieved by any method as long as the bearing unit 710 can be fixed as described above as a method of forming the holding layer 711 by filling the filler. However, as a method of forming the holding layer 711, particularly, the injection molding method and the compression molding method are excellent as the filling material injection method in consideration of mass productivity, accuracy, cost, and the like.

In the seventh embodiment shown in FIG. 29, the bearing holding portion 729 for holding the bearing unit 710 is configured to hold the outer cylindrical surface of the bearing unit 710. FIG. 30 is a cross-sectional view showing a configuration in which the shaft holding portion 724 of the bearing unit 710 is held by the mold shaft holding portion 748 of the mold 737. The mold shaft holding portion 748 is formed by a substantially circular concave portion on the upper and lower surfaces of the mold 737. The mold shaft holding portion 748 is formed so that the shaft holding portion 724 of the bearing unit 710 can be fitted therein. As described above, the shaft holding portion 724, which is the central portion of the bearing unit 710, is held by the mold 737. That is, in the case of the mold 737 shown in FIG. 30, the bearing unit 710 is held by the mold 737 at a position closer to the center of rotation of the bearing unit 710, so that the effect of the rattling of the bearing in the bearing unit 710 is eliminated. .
The shapes of the bearing holding portion 729 and the mold shaft holding portion 748 of the molds 727 and 737 shown in FIGS. 29 and 30 are based on the outer cylindrical surface 728 of the bearing unit 710 and the outer cylindrical surface of the shaft holding portion 724. And any configuration and mechanism having the configuration of securely holding the bearing unit 710 can provide the same effects as those of the above embodiment.

FIG. 31 shows that the bearing unit 710 is
FIG. 6 is a cross-sectional view showing another mechanism held by the device. This mold 747 has the same screw 749A as the screw that is the center of rotation of the bearing unit 710 in the final actuator. The screw 749A is used for the bearing unit 710.
Is formed to be screwed into the shaft holding portion 724.
As described above, the screw 749A is screwed into the screw hole formed in the lower part of the shaft holding portion 724, which is the rotating shaft, so that the bearing unit 710 is accurately arranged at an appropriate position in the mold. In the embodiment shown in FIG. 31, the pin 749B formed on the mold 747 is inserted into the upper screw hole formed on the shaft holding portion 724. As described above, by providing the screw 749A and the pin 749B in the mold 747 and engaging with the position of the rotation center of the bearing unit 710 in the mold, the predetermined swing center of the actuator and the actual rotation center are set. And can be completely matched. In the above embodiment, the screw 7 is attached to the mold 747.
Although an example in which both 49A and the pin 749B are provided has been described,
The bearing unit 710 can be positioned using only a screw without using a pin or using only a pin without using a screw.

Next, a mechanism for automatically holding the bearing unit in the mold will be described. FIG. 32 is a cross-sectional view showing a state in which the bearing unit 710 is arranged in the mold at the time of manufacturing the actuator of this embodiment. FIG. 33 is a cross-sectional view of the state shown in FIG. 32 cut along the line ZZ. The mold 757 shown in FIGS. 32 and 33 is used in an automatic molding process using a robot or the like. This mold 757 has a fixed holding section 750 and a movable holding section 751. As shown in FIGS. 32 and 33, when the bearing unit 710 is disposed at a predetermined position in the mold, at least one movable holding portion 751 moves and the bearing unit 710 moves together with the fixed holding portion 750.
To secure and secure it.

FIGS. 34 to 36 are explanatory views showing another mechanism for automatically holding the bearing unit in the mold. The holding mechanism shown in FIGS. 34 to 36 schematically shows an operation for surely holding a bearing unit used in a mold at an accurate position. FIG. 34 is a side view showing a state where the bearing unit 710 is arranged in the lower mold 767A, and FIG. 35 is a side view showing a state where the upper mold 767B is closed. FIG. 36 shows a bearing unit 710.
Is a side view showing a state immediately before filling with a filler, between the lower mold 767A and the upper mold 767B.

Next, the operation of the molding process using this mold will be described with reference to FIGS. First, FIG.
As shown in FIG. 4, the bearing unit 710 is inserted into a movable holding portion 752 provided in the lower mold 767A in advance by a robot or the like. At this time, the protruding tip of the movable holding portion 752 is chamfered or tapered, and the bearing unit 710 is smoothly and reliably inserted between the movable holding portions 752. Also, the inserted bearing unit 71
The movable holding portion 752 is arranged to have a certain height so that 0 does not move.

Next, as shown in FIG. 35, the upper mold 767B is closed with respect to the lower mold 767A in which the bearing unit 710 is disposed. A projection-like fixed holding portion 753 is formed at a position where the bearing unit 710 of the upper mold 767B is to be arranged. When the upper mold 767B is closed, the bearing unit 710 is located at a correct position by the movable holding portion 752 of the lower mold 767A. For this reason, when the upper mold 767B is closed, the upper end of the bearing unit 710 is precisely fixed to the fixed holding portion 75.
3 is inserted smoothly. As a result, the bearing unit 7
10 has a lower mold 767A and an upper mold 767 at both ends.
And B is more reliably and accurately held.

Next, as shown in FIG.
52 moves in the direction stored in the lower mold 767A. By housing the movable holding section 752 in this way, a filling area between the bearing unit 710 and the bearing section of the actuator is secured. At this time, not all of the movable holding portion 752 is stored, and the movable holding portion 752 is configured to stop while securely holding the lower end portion of the bearing unit 710. As described in the seventh embodiment, the bearing unit 710 is firmly held at an accurate position in a short time by having the above structure of the mold. Note that the holding mechanism of the bearing unit 710 may be any shape and mechanism as long as a part or the whole of the holding mechanism moves in the mold to securely hold the bearing unit 710 at an accurate position. Even so, the effects of the present invention are exhibited.

A filler for realizing each embodiment according to the present invention may be any filler that can be filled in a mold and solidifies after filling. In particular, in consideration of problems such as cost, productivity, and accuracy, it is preferable to use a resin material or a metal material as the filler. For example, aluminum and magnesium are suitable as the metal material of the filler. As the resin-based filler, both thermoplastic resin and thermosetting resin can be implemented,
Particularly, a thermoplastic resin is suitable from the viewpoint of productivity and the like. Also, in the thermoplastic resin, acrylonitrile styrene copolymer, polyether ether ketone resin, polyether nitrile resin, polyether sulfone resin, polyethylene naphthalate resin, syndiotactic polystyrene resin, polyamide resin, polyacetal resin, polycarbonate resin , Modified polyoxide resin, polybutylene terephthalate resin, polyethylene terephthalate resin,
Polyphenylene ether resin, polyphenylene sulfide resin, polysulfone resin, polyarylate resin, thermotropic liquid crystal polymer resin, polyether resin,
Engineering plastics such as polyimide resin, acrylonitrile butadiene styrene, and polypropylene are suitable.

Further, among the thermoplastic resins, heat resistance,
In addition to thermotropic liquid crystal polymer resin, polyphenylene sulfide resin,
Polyethersulfone resin is optimal. In the above resin, the main components are shown, and a combination of different fats using a so-called polymer alloy, talc, mica, calcium carbonate, silica, titanium oxide, clay, calcium sulfate, magnesium hydroxide, alumina, barium zinc oxide By mixing inorganic and organic fillers such as iron oxide, ferrite, molybdenum sulfide, and graphite, and fibrous fillers such as glass fiber, carbon fiber, and various whiskers, into the above resin, the mechanical strength, toughness, electrical properties, etc. It is also effective to use a material whose physical property value is changed.

Further, an adhesive may be used as a filler for the holding layer 111. As the adhesive, an adhesive of epoxy resin type, urea formaldehyde resin type, bismaleimide triazine resin type, acrylic type or the like is used. The present invention is also effective when the bearing is fixed to the bearing portion using the adhesive as the filler. This adhesive may be of any kind, such as two-part, one-part, and thermosetting. In particular, when an adhesive is used as the holding layer 111 in a hard disk drive (HDD), it is effective to use one that takes into account the effects of exhaust gas during use, so-called outgassing. For example,
It is particularly preferable to use an acrylic adhesive after baking (firing) at 80 to 90 ° C.

Eighth Embodiment An actuator according to an eighth embodiment of the present invention will be described below with reference to FIG.
FIG. 37 is a plan view showing a state in which the swing type actuator 835 of the eighth embodiment is assembled in the hard disk drive 842. This hard disk device 842
Is configured to read or write information concentrically recorded on the recording surface of a disk-shaped recording medium 830 by a head 832 attached to the arm end of an actuator 835. Head 832
Is attached to the tip of the arm via a thin metal plate 831 called a suspension. The head 832
Coil 8 attached to the other end of actuator 835
It is configured to swing and rotate by an electric action (Fleming's law) by a permanent magnet 833 (only one side is shown in FIG. 37) disposed so as to sandwich the coil 04 and its coil 804. At this time, the actuator 835
Is configured to rotate about the center 834 of the bearing unit 810 as a rotation center, and to move the head 832 in the radial direction of the recording medium 830 to swing.

In the swing type actuator 835 used in the eighth embodiment, as described in the previous embodiment, the bearing unit 810 disposed in the bearing hole 806 fills the mold with the filler 839. It has a bearing structure that is firmly fixed. For this reason, the actuator 835 of the eighth embodiment has a bearing structure in which the assembling process is simplified by having the structure of each of the above-described embodiments, and thus the actuator 835 is easily manufactured. In addition, the actuator 835 of the eighth embodiment
The bearing unit 81 can be precisely positioned in the mold during manufacturing.
Since the fixing of 0 is performed, the rotation center is arranged with high accuracy. Therefore, the actuator 8 of the eighth embodiment
35 is particularly suitable for an apparatus that needs to position the head 832 of the arm unit 102 with high accuracy.

The actuators that need to be positioned with high precision as described above are often used for moving a head for recording and reproducing information on a disk-shaped recording medium. Optimally used for mobility. The hard disk drive 842 using the actuator 835 of the eighth embodiment is
In particular, by selecting the filler 839 around the bearing unit 810 as a material having desired characteristics, the resonance frequency around the head of the actuator 835 can be changed. As a result, the hard disk drive 842 using the actuator 835 of the eighth embodiment has a structure in which the head slap phenomenon hardly occurs. When the filler 839 is selected, the resonance frequency is increased when the hardness of the filler 839 is relatively high, and the resonance frequency can be decreased when the hardness is reduced.

The resonance frequency at which the head slap phenomenon occurs in the actuator 835 depends on the actuator 835.
, In particular, the arm portion 102, the suspension 831, the head 832, the bearing unit 810, the filler 8
It is determined by a combination of physical property values such as 39. The resonance frequency at the mounting portion (bearing unit portion) of the actuator 835 can be changed by selecting a physical property value such as the hardness of the filler 839. Therefore, the resonance frequency can be adjusted by changing the physical property value of the filler 839 even if the resonance frequency causes the head slap phenomenon determined by the combined factor. Therefore, the apparatus using the actuator 835 according to the eighth embodiment has an effective means for improving the shock resistance and the head slap resistance.

[0105]

As apparent from the detailed description of the embodiments, the present invention has the following effects.
According to the present invention, the bearing unit is fixed in the mold by the filler, whereby the bearing unit assembling step is reduced, and the bearing unit is held in the mold, so that the bearing unit is simultaneously placed in the mold. In addition, the positional accuracy of the combination with the actuator body can be maintained at a high level that matches the mold processing accuracy. Further, according to the present invention, a filler is filled in a gap between a bearing hole, which is a part for mounting the bearing unit of the actuator, and the bearing unit is fixed, so that a bearing hole required for a bearing portion of the actuator is formed. The hole processing accuracy is improved with a lower accuracy than the conventional one. For this reason,
The bearing hole is formed by die casting or extrusion.
Since it can be used as it is without post-processing by lathe or machining, the manufacturing cost of the actuator can be greatly reduced.

Further, according to the present invention, components other than the bearing unit constituting the actuator, such as coils and terminal pins, can be fixed in the mold simultaneously with the fixing of the bearing unit. For this reason, according to the present invention, it is possible to provide a swing type actuator with low machining cost and high accuracy. Further, according to the present invention, by changing the filler around the bearing unit, it becomes possible to change the resonance frequency of the actuator, particularly the arm portion, and it is possible to reduce the head slap phenomenon.

Further, according to the present invention, since a filler for fixing the coil of the actuator and a filler for fixing the bearing unit can be freely selected and used, different materials can be used. The conductivity and the hardness can be set to optimal values for each part. Further, according to the present invention, the actuator can be manufactured by an injection molding method that can be mass-produced at low cost, and the filler used is generally a thermotropic liquid crystal polymer or a polyphenylene sulfide-based mass-produced material. resin,
Alternatively, it can be produced using a polyethersulfone resin.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a main body of an actuator according to a first embodiment of the present invention.

FIG. 2 is a perspective view showing a state where a bearing unit is incorporated in a main body of the actuator of FIG. 1;

FIG. 3 is a cross-sectional view illustrating a bearing unit in the actuator according to the first embodiment of the present invention.

FIG. 4 is a plan view showing an actuator according to a conventional manufacturing method.

FIG. 5 is a plan view showing an actuator according to the first embodiment of the present invention.

FIG. 6 is a perspective view showing an actuator according to a second embodiment of the present invention.

FIG. 7 is a perspective view showing another actuator according to the second embodiment of the present invention.

FIG. 8 is a perspective view showing an arm part according to a third embodiment of the present invention.

FIG. 9 is a perspective view showing an actuator according to a third embodiment of the present invention.

FIG. 10 is a cross-sectional view illustrating a bearing portion of an actuator according to a third embodiment of the present invention.

FIG. 11 is a perspective view showing another arm part according to the third embodiment of the present invention.

FIG. 12 is a perspective view showing still another arm part according to the third embodiment of the present invention.

FIG. 13 is a cross-sectional view showing a bearing portion of an actuator in which another arm component according to the third embodiment shown in FIG. 12 is assembled.

FIG. 14 is a perspective view showing an actuator in Examples 4 and 5 according to the present invention.

FIG. 15 is a perspective view showing another actuator according to the fourth embodiment of the present invention.

16A and 16B are a side view and a plan view showing an actuator component (carriage unit) according to a fourth embodiment of the present invention.

FIG. 17 is a side view (a) and a plan view (b) showing another actuator component (carriage part) in Embodiment 4 according to the present invention.

FIG. 18 is a side view showing still another actuator part (carriage part) according to the fourth embodiment of the present invention.
And a plan view (b).

FIG. 19 is a side view showing still another actuator part (carriage part) according to the fourth embodiment of the present invention.
And a plan view (b).

FIG. 20 is a side view showing still another actuator part (carriage part) according to the fourth embodiment of the present invention.
And a plan view (b).

FIG. 21 is a perspective view showing an actuator using the actuator part of FIG. 20.

FIG. 22 is a plan view showing an actuator according to a conventional manufacturing method.

FIG. 23 is a plan view showing an actuator according to a fourth embodiment of the present invention.

FIG. 24 is a perspective view showing a bearing unit according to a sixth embodiment of the present invention.

FIG. 25 is a sectional view showing a bearing unit according to a sixth embodiment of the present invention.

FIG. 26 is a cross-sectional view illustrating a bearing portion of an actuator according to a sixth embodiment of the present invention.

FIG. 27 is a cross-sectional view illustrating another bearing portion of the actuator according to the sixth embodiment of the present invention.

FIG. 28 is a cross-sectional view illustrating still another bearing unit in the actuator according to the sixth embodiment of the present invention.

FIG. 29 is a sectional view showing a bearing unit held in a mold according to a seventh embodiment of the present invention.

FIG. 30 is a sectional view showing a bearing unit held in another mold according to the seventh embodiment of the present invention.

FIG. 31 is a sectional view showing a bearing unit held in still another mold according to the seventh embodiment of the present invention.

FIG. 32 is a side sectional view showing an operation of a bearing unit holding mechanism of still another mold according to the seventh embodiment of the present invention.

FIG. 33 is a plan sectional view showing the operation of the bearing unit holding mechanism in the seventh embodiment in FIG. 32;

FIG. 34 is a cross-sectional view illustrating an operation of still another bearing unit holding mechanism in the seventh embodiment according to the present invention.

35 is a cross-sectional view illustrating an operation of the bearing unit holding mechanism of FIG.

FIG. 36 is a cross-sectional view illustrating the operation of the bearing unit holding mechanism of FIG.

FIG. 37 is a plan view showing a hard disk drive according to Embodiment 8 of the present invention.

FIG. 38 is a perspective view showing a conventional actuator main body.

FIG. 39 is a perspective view showing a state where a bearing unit is incorporated in the conventional actuator body of FIG. 38;

40 is a cross-sectional view showing a bearing portion in the conventional actuator of FIG. 39.

[Explanation of symbols]

 101 bearing part 102 arm part 103 coil part 104 coil 105 terminal pin 106 bearing hole 107 head mounting hole 109 wiring fixing hole 110 bearing unit 111 holding layer 211 holding layer 212 holding part 315 arm part 316 sleeve 317 arm part 318 filler 411 Holding part 419 Communication part 624 Shaft holding part 625 Bearing holding part 626 Step 727 Die 729 Bearing holding part

Continued on the front page F term (reference)

Claims (32)

[Claims] A bearing unit having a bearing hole; a bearing unit disposed inside the bearing hole and provided with a gap from an inner surface of the bearing hole; and a gap between the bearing unit and the bearing hole. And a holding layer formed by solidifying the filler. 2. The method according to claim 1, wherein a melt made of resin or metal is used as a main component as the filler.
3. The bearing device according to item 1. 3. The bearing device according to claim 1, wherein a thermotropic liquid crystal polymer, a polyphenylene sulfide-based resin or a polyether sulfone-based resin is used as a filler as a main component. 4. The bearing according to claim 1, wherein the inner surface of the bearing hole is provided with substantial irregularities such as grooves, holes, projections, etc., and the holding layer has a shape corresponding to the irregularities. 3. The bearing device according to item 1. 5. The bearing unit according to claim 1, wherein substantially irregularities such as grooves, holes, and projections are formed on an outer peripheral surface of the bearing unit, and the holding layer has a shape corresponding to the irregularities.
The bearing device according to 2, 3, or 4. 6. The bearing unit has an inner ring portion and an outer ring portion, the inner ring portion is fixed, and the outer ring portion is configured to swing and rotate together with the bearing portion having the bearing hole. The bearing device according to claim 1, 2, 3, 4, or 5, wherein: 7. An arm section to which a head for reading and writing information is attached; a bearing section for holding a rotating shaft for swinging the head; and a magnetic circuit for swinging the head. An actuator having a coil unit having a coil, wherein the bearing unit is disposed with a gap from an inner surface of a bearing hole formed in the bearing unit, and a gap between the bearing hole and the bearing unit. And a solidified holding layer filled with a filler. 8. The actuator according to claim 7, wherein at least a part of the bearing portion is formed of a filler. 9. The actuator according to claim 7, wherein at least a part of the arm portion is formed of a filler. 10. An arm unit to which a head for reading and writing information is attached, a bearing unit for holding a rotating shaft for swinging the head, and a magnetic circuit for swinging the head. An actuator having a coil unit having a coil, wherein the bearing unit is disposed with a gap from an inner surface of a bearing hole formed in the bearing unit, and a gap between the bearing hole and the bearing unit. And a holding layer that is solidified by being filled with a filler, wherein at least a part of the arm portion is formed of the filler and is fixed to the bearing portion. 11. The actuator according to claim 10, wherein a shape required for the arm portion is formed of a filler. 12. The actuator according to claim 10, wherein the plurality of arms are fixed to the bearing portion with a filler at a predetermined distance from each other to form the arm portion. 13. An arm unit to which a head for reading and writing information is attached; a bearing unit for holding a rotating shaft for swinging the head; and a magnetic circuit for swinging the head. An actuator having a coil unit having a coil, wherein the bearing unit is disposed with a gap from an inner surface of a bearing hole formed in the bearing unit, and a gap between the bearing hole and the bearing unit. And a holding layer that is solidified by being filled with a filler, wherein at least a part of the coil portion is formed of the filler, and the coil portion is fixed to the bearing portion. . 14. The actuator according to claim 13, wherein the holding layer and the filler of the coil portion are connected. 15. A holding layer for holding the bearing unit inside the bearing hole, wherein the holding layer is filled with a filler while the bearing unit is arranged inside the bearing hole by the holding means. The actuator according to claim 13 or 14, wherein the actuator is formed. 16. The actuator according to claim 7, wherein a thermotropic liquid crystal polymer, a polyphenylene sulfide-based resin or a polyether sulfone-based resin is used as a filler as a main component. 17. An arm section to which a head for reading and writing information is attached, a bearing section for holding a rotating shaft for swinging the head, and a magnetic circuit for swinging the head. An actuator having a coil unit having a coil, wherein the bearing unit is disposed with a gap from an inner surface of a bearing hole formed in the bearing unit, and a gap between the bearing hole and the bearing unit. And a holding layer that is solidified by being filled with a filler, wherein at least a part of the coil part is formed of a filler, and the filler of the coil part and the filler of the holding layer are different from each other. An actuator, characterized in that: 18. The actuator according to claim 17, wherein the filler of the coil portion is a non-conductive material, and the filler of the holding layer is a conductive material. 19. The actuator according to claim 18, wherein the conductive material uses a metal or a conductive resin. 20. The bearing unit having an inner ring portion and an outer ring portion, wherein the inner ring portion is fixed, and the outer ring portion is configured to swing and rotate together with the bearing portion having the bearing hole. The actuator according to any one of claims 7 to 19, wherein: 21. An arm portion to which a head for reading and writing information is attached; a bearing portion for holding a rotating shaft for swinging the head; and a magnetic circuit for swinging the head. A bearing unit used for an actuator having a coil portion having a coil, wherein the bearing unit is fixed to a holding layer of a filler to hold the rotating shaft, and has substantially irregularities such as grooves, holes, and projections on a side cylinder surface. A bearing unit for an actuator, wherein the bearing unit is formed. 22. A projection provided on a side cylindrical surface of the bearing unit is formed so as to penetrate the holding layer and reach an inner surface of a bearing hole in which the bearing unit is arranged, and the filler of the holding layer is solidified 22. The bearing unit for an actuator according to claim 21, wherein the bearing unit is configured to be preliminarily fixed inside the bearing hole before performing. 23. The bearing unit for an actuator according to claim 22, wherein the projection is formed separately from the bearing unit and is made of an elastic material. 24. An arm section to which a head for reading and writing information is attached, a bearing section for holding a rotating shaft for swinging the head with a holding layer of filler via a bearing unit, A method of manufacturing an actuator having a coil portion having a coil arranged in a magnetic circuit for moving the bearing unit, wherein the bearing unit is located at a predetermined position inside a bearing hole formed in the bearing portion inside a mold. Fixing, filling at least a gap between the inner surface of the bearing hole and the bearing unit with a filler by an injection molding method or a compression molding method, and a step of solidifying the filler to form a holding layer; A method for manufacturing an actuator having: 25. Before the bearing unit is fixed in the mold, the bearing unit is temporarily assembled in the bearing hole, and at least a coil is temporarily assembled in the bearing portion to be integrally formed. The method for manufacturing an actuator according to claim 24, further comprising a step of disposing the actuator at a predetermined position in a mold. 26. The method for manufacturing an actuator according to claim 24, wherein a thermotropic liquid crystal polymer, a polyphenylene sulfide-based resin, or a polyether sulfone-based resin is used as a filler as a main component. 27. An arm unit to which a head for reading and writing information is attached, a bearing unit for holding a rotating shaft for swinging the head with a holding layer of a filler via a bearing unit, and swinging the head. And a coil part having a coil disposed in a magnetic circuit to move the actuator. A mold for manufacturing an actuator, wherein the bearing unit is fixed at a predetermined position inside a bearing hole formed in the bearing part. A mold for manufacturing an actuator, wherein a filler is filled by an injection molding method or a compression molding method at least in a gap between the bearing hole and the bearing unit. 28. The mold according to claim 27, further comprising a holding mechanism for fixing an outer cylindrical surface of the bearing unit. 29. The mold for manufacturing an actuator according to claim 27, further comprising a holding mechanism for fixing a rotating shaft of the bearing unit. 30. A holding mechanism for fixing a rotating shaft of the bearing unit, wherein the bearing unit is fixed by a pin or a screw formed at a position corresponding to the rotating shaft. A mold for manufacturing the actuator according to claim 29. 31. The bearing mechanism, wherein the holding mechanism is movable and moves when the bearing unit is inserted into the mold, when the mold is closed, or before the filler is filled. 31. The mold for manufacturing an actuator according to claim 28, wherein the unit is configured to fix the unit. 32. A disk device comprising the actuator according to any one of claims 7 to 20.