WO2014188866A1 - Method for manufacturing actuator unit, moving body for actuator unit, and actuator unit having same - Google Patents

Abstract

The present invention provides a method for manufacturing an actuator unit incorporating an actuator which drives a moving body that includes an optical component in the axial direction of a driving shaft. At least a portion of the moving body is pressed and the site at which a stress is generated due to the pressure melts and then congeals so that a contact surface that is included in the surface of the moving body and determines the attitude of the moving body with respect to the driving shaft by coming in contact with the driving shaft takes a prescribed attitude with respect to an attitude defining surface which is included in the surface of the moving body excluding the contact surface and determines the attitude of the optical component in the moving body. The present invention also provides the moving body for an actuator unit manufactured by the manufacturing method and the actuator unit having the moving body.

Description

Actuator unit manufacturing method, actuator unit moving body, and actuator unit having the same

The present invention relates to a method of manufacturing an actuator unit that drives an optical component such as an imaging lens in an imaging device of a mobile phone, for example, a moving body of an actuator unit manufactured by this manufacturing method, and an actuator unit having the same.

Conventionally, a drive device (actuator unit) described in Patent Document 1 is known as a drive device (actuator unit) for driving an optical component such as an imaging lens by an actuator using an electromechanical transducer.

As shown in FIG. 18, this drive device includes an actuator body 201, a moving body 220 that holds an imaging lens (optical component) 202, and a housing 203. The actuator body 201 includes a drive member (drive shaft) 210 and a piezoelectric element (electromechanical conversion element) 211. The drive member 210 is a columnar shaft member that extends in the optical axis direction (left-right direction in FIG. 18). The piezoelectric element 211 vibrates by being repeatedly expanded and contracted in the optical axis direction when electric power having a predetermined waveform is supplied. A driving member 210 is connected to one end (left end in FIG. 18) 213 of the piezoelectric element 211 in the optical axis direction so that the central axis coincides with the optical axis direction. The moving body 220 includes a lens frame 221 that holds the imaging lens 202 and a friction member 222 that engages the lens frame 221 with the actuator main body 201 so as to be movable. The friction member 222 has a through hole in the optical axis direction through which the drive member 210 is inserted. In the friction member 222, the inner diameter of the through hole is set so as to be engaged with the driving member 210 by a predetermined frictional force. The housing 203 has an accommodation space inside, and the actuator main body 201 is accommodated in the accommodation space.

Such a driving device 200 is disposed in an imaging device or the like of a camera or a mobile phone, and is used for zooming or focusing of the imaging lens 202. In the driving device 200, when electric power having a predetermined waveform is supplied and the piezoelectric element 211 vibrates in the optical axis direction, the driving member 210 connected to the piezoelectric element 211 also vibrates in the optical axis direction (axial direction of the driving member). To do. At this time, since the friction member 222 of the moving body 220 is engaged with the driving member 210 with a predetermined frictional force, the moving body 220 moves in the optical axis direction. Thereby, the imaging lens 202 held by the moving body 220 moves in the optical axis direction, and zooming and focusing are performed.

In recent years, the optical axis direction of an optical component with respect to the image sensor 205 is adjusted with high accuracy in an imaging device or the like of a camera or a mobile phone (hereinafter also simply referred to as “imaging device or the like”) due to a demand for higher accuracy of the camera function. It is demanded. However, in the above-described driving device 200 or the like, the optical axis direction of the optical component such as the imaging lens 202 may be inclined with respect to the central axis of the driving member 210 due to a manufacturing error of each component constituting the driving device 200 or the like. In this case, the accuracy of the optical component in the optical axis direction of the optical component with respect to the imaging element 205 may not be ensured in the imaging device or the like simply by incorporating the driving device 200 into the imaging device or the like. For this reason, when the drive device 200 is incorporated into an imaging device or the like, the positioning device 240 is used to adjust the arrangement position and orientation of the drive device and then fixed by the support member 206 as shown in FIG. Thus, the accuracy in the optical axis direction of the optical component in the imaging apparatus or the like is ensured.

However, as described above, when the arrangement position and orientation of the driving device (actuator unit) 200 are adjusted during the incorporation into the imaging device or the like, the assembling work takes time compared to the case where the driving device 200 is simply incorporated, and the automatic operation is performed automatically. Production efficiency in production (mass production) decreases. Further, in order to sufficiently secure the component accuracy of each component constituting the drive device 200, high machining accuracy is required, and the manufacturing cost of the component is increased.

JP 2007-159172 A

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an actuator capable of sufficiently obtaining accuracy in the direction of the optical axis only by being incorporated in an imaging device or the like by securing component accuracy while suppressing cost. It is an object to provide a method of manufacturing a unit, a moving body of an actuator unit manufactured by the manufacturing method, and an actuator unit having the same.

A method for manufacturing an actuator unit according to the present invention is a method for manufacturing an actuator unit that incorporates an actuator that drives a moving body including optical components in the axial direction of a drive shaft, and is included in the surface of the moving body and contacts the drive shaft. The contact surface that determines the posture of the moving body with respect to the drive shaft by contact is included in the surface of the moving body excluding the contact surface, and has a predetermined posture with respect to the posture defining surface that determines the posture of the optical component in the moving body. In this way, at least a part of the moving body is pressed, and the portion where the stress is generated by the pressing is melted and then solidified. And the moving body of the actuator unit concerning this invention is manufactured by this manufacturing method, and the actuator unit concerning this invention has this moving body. According to the present invention, a method for manufacturing an actuator unit in which accuracy in the optical axis direction can be sufficiently obtained simply by being incorporated in an imaging device or the like by securing component accuracy while suppressing cost, and an actuator unit manufactured by this manufacturing method Can be provided.

The above and other objects, features and advantages of the present invention will become apparent from the following detailed description and the accompanying drawings.

It is a perspective view of the actuator unit concerning this embodiment. It is a disassembled perspective view of the actuator unit. It is a perspective view of the unit main body in the actuator unit. It is a top view of the said unit main body of the state which has arrange | positioned the actuator main body. It is a top view of the said unit main body of the state which has arrange | positioned the actuator. It is an expansion perspective view of the actuator body. It is a perspective view of a moving body. It is a disassembled perspective view of the said mobile body. It is a schematic diagram for demonstrating the said actuator unit of the state in which the lens barrel was hold | maintained. It is a figure for demonstrating the correction process of the attitude | position of the 1st sliding surface with respect to an attitude | position prescription | regulation surface. It is a figure for demonstrating the state which pressed the mobile body main body with the pressing member. FIG. A is a diagram for illustrating a melting portion in the case where the moving body main body is melted over the entire width in the optical axis direction, and FIG. B includes an end portion in the optical axis direction of the moving body main body and the optical axis. It is a figure which shows the fusion | melting site | part in the case of melting a part in a direction. It is a figure for demonstrating the correction process of the attitude | position of the 2nd sliding surface with respect to an attitude | position prescription | regulation surface. It is the elements on larger scale which show the 2nd reference surface and its vicinity in the correction process of the attitude | position of the said 2nd sliding surface. FIG. A is a view for illustrating a melting portion when the guide spring is melted over the entire width in the optical axis direction, and FIG. B includes an end portion of the guide spring in the optical axis direction and in the optical axis direction. It is a figure which shows the fusion | melting site | part in the case of melting a part. It is a figure for demonstrating the process of pressing a 1st sliding surface against a 1st reference surface by pressing the 1st flange side edge part of a mobile body main body toward the 2nd flange side edge part. It is a figure for demonstrating the guide spring which has a site | part with a small width | variety of an optical axis direction, and its melting position. It is a schematic sectional drawing for demonstrating the conventional drive device. It is a partial expanded sectional view which shows the state by which the actuator main body was fixed to the housing | casing with the support member in the said conventional drive device.

Hereinafter, an embodiment according to the present invention will be described with reference to the drawings. First, an actuator unit will be described, and then a method for manufacturing the actuator unit will be described. In addition, the structure which attached | subjected the same code | symbol in each figure shows that it is the same structure, The description is abbreviate | omitted suitably. In this specification, when referring generically, it shows with the reference symbol which abbreviate | omitted the suffix, and when referring to an individual structure, it shows with the reference symbol which attached the suffix. In the following description, the X direction in FIGS. 1, 2, and 6 to 9 will be described as the upper side, and the Y direction will be described as the lower side. The actuator unit according to the present embodiment is used in an imaging apparatus. In this case, the upper side is the object side, and the lower side is the image side.

The actuator unit according to the present embodiment is used in, for example, a camera module (imaging device) that can be mounted on a mobile phone or the like, and moves (drives) an imaging lens (optical component) with respect to the imaging element. As shown in FIGS. 1 and 2, the actuator unit 1 includes a unit main body 2, an actuator 3, and a cover 8.

The unit main body 2 has a base 20 and a plurality of (four in the example of the present embodiment) struts (first to fourth struts 120a, 120b, 120c, 120d). The unit body 2 is formed of a resin material such as LCP (liquid crystal polymer), for example.

As shown in FIGS. 3 to 5, the base portion 20 has a rectangular outline in a plan view and has a circular through hole 21 penetrating in the vertical direction in the center portion. The through hole 21 serves as an optical path. In the following description, an axis passing through the center of the through hole 21 in the vertical direction is a central axis (or optical axis) C.

The base 20 has four corners (first to fourth corners 20a, 20b, 20c, 20d). In the present embodiment, a specific corner (the lower left corner in FIG. 4) is the first corner 20a, and the second corner 20b and the third corner are counterclockwise in FIG. A portion 20c and a fourth corner 20d are assumed.

The first to fourth corner portions 20a, 20b, 20c, 20d of the base 20 are provided with first to fourth support columns 120a, 120b, 120c, 120d.

The first support column 120a is in contact with the actuator 3 (specifically, the actuator body 30). The first support column 120a includes an outer surface 121a and an inner surface 122a on the surface thereof. In plan view, the outer surface 121a is flush with the outer surface of the first corner 20a of the base 20, and the inner surface 122a is curved along the outer peripheral surface of the actuator body 30 (specifically, the drive shaft 33). The actuator body 30 (specifically, the drive shaft 33) comes into contact.

The second support column 120b is provided on the inner side of the outer surface of the second corner of the base. More specifically, the second column b 120 b is provided between the moving body 5 of the moving body 4 and the guide spring 6.

The third support column 120c is formed with a restriction portion groove 29 into which a part of the movable body 4 (specifically, the rotation restriction portion 61a) is fitted so as to be movable up and down. The restriction portion groove 29 is provided on the inner side surface (side surface of the central axis C) 122c of the third support column portion 120c and extends in the vertical direction. The outer surface 121c of the third support column 120c is flush with the outer surface of the third corner portion 20c of the base 20 in plan view.

The fourth support column 120d is configured such that the outer surface 121d is flush with the outer surface of the fourth corner 20d of the base 20 and the inner surface 122d is curved along the moving body 4 in plan view. ing.

The base portion 20 includes an actuator holding portion 25 that holds the actuator 3 (actuator body 30) on the inner side (center axis C side) of the first support column portion 120a in the first corner portion 20a. The actuator holding portion 25 is recessed in a cylindrical shape so as to have a predetermined depth from the upper surface 20 e of the base portion 20.

The base 20 includes the first electrode terminal 22 and the second electrode terminal 23 described above at the first corner 20a. The intermediate portions of the first electrode terminal 22 and the second electrode terminal 23 are embedded in the base 20 (unit body 2). And the front-end | tips 22a and 23a of the 1st electrode terminal 22 and the 2nd electrode terminal 23 protrude (exposure) from the both sides of the actuator holding | maintenance part 25 of the upper surface 20e, and the base end side protrudes from the outer surface of the base 20 (exposure). The external connection terminals 22b and 23b are configured. These external connection terminals 22b and 23b are connected to a circuit board, a connector, and the like of the cellular phone when the actuator unit 1 is mounted on, for example, a cellular phone (not shown).

The actuator 3 includes an actuator body 30 and a moving body 4. As shown in FIG. 6, the actuator body 30 includes, in order from the bottom, a weight 31, a piezoelectric element (electromechanical conversion element) 32 that can be expanded and contracted (vibrated) in the central axis C direction, and expansion and contraction of the piezoelectric element 32. A drive shaft (drive friction member) 33 that reciprocates (vibrates) in the direction of the central axis C by (vibration). This actuator main body 30 is fixed to the unit main body 2 so that a part (drive shaft 33) of the actuator main body 30 contacts the moving body 4 (see 110 and 111 in FIG. 5).

The weight 31 increases the inertial mass on one end side (the lower end side in the present embodiment) of the piezoelectric element 32 so that the displacement due to the expansion and contraction of the piezoelectric element 32 is generated only on the other end side (the upper end side in the present embodiment). . The weight 31 of this embodiment is made of a material having a high specific gravity such as tungsten or a tungsten alloy. Note that the weight 31 is omitted when the other end (lower end) of the piezoelectric element 32 is attached to a device that exhibits a function similar to the function of the weight 31 (for example, the unit main body 2 (base 20)). Also good.

The piezoelectric element 32 vibrates by repeatedly expanding and contracting in the direction of the central axis C when electric power having a predetermined waveform is supplied. The piezoelectric element 32 according to the present embodiment is a quadrangular columnar laminated piezoelectric element in which a rectangular layer obtained by thinly extending a material such as PZT (lead zirconate titanate) is laminated in the direction of the central axis C so that an internal electrode is sandwiched between the layers. It is comprised by the element.

The piezoelectric element 32 has external electrodes 32a on two opposing side surfaces. These external electrodes 32a are formed by sputtering silver or the like on the two side surfaces, and electrodes sandwiched between the layers of the piezoelectric element 32 are connected in parallel.

The drive shaft 33 is a columnar member extending in the direction of the central axis C. A part of the outer peripheral surface of the drive shaft 33 contacts the moving body 4 (see 110 and 111 in FIG. 5). In the present embodiment, the drive shaft 33 is in contact with the moving body 4 at two locations in the circumferential direction. At each contact location, the drive shaft 33 is in contact with the moving body 4 in a straight line extending in the direction of the optical axis C. The drive shaft 33 of the present embodiment is made of, for example, CFRP (carbon fiber reinforced plastic) molded in a columnar shape so that carbon fibers are arranged in the direction of the central axis C.

The drive shaft 33 is formed so as to protrude radially outward from the outer periphery of the piezoelectric element 32.

The actuator body 30 is connected to the first electrode terminal 22 and the second electrode terminal 23 by a first electrode coupling spring 26a and a second electrode coupling spring 26b so as to be energized. The first and second electrode coupling springs 26a and 26b of the present embodiment are torsion coil springs made of phosphor bronze having high electrical conductivity, but may be made of stainless steel, piano wire, or the like. The surfaces of the first and second electrode coupling springs 26a and 26b are plated with gold or platinum.

Next, the moving body 4 will be described with reference to FIGS.

The moving body 4 has a short cylindrical shape, is configured to be able to hold the lens barrel 7 shown in FIG. 9 and to be relatively movable in the direction of the central axis C with respect to the unit body 2. The moving body 4 includes a metal cylindrical moving body main body 5 and a guide spring (pressing member) 6.

The movable body 5 includes a lens holding surface (attitude defining surface) 54 on the inner peripheral side, and holds the lens barrel 7 by the lens holding surface 54. The lens barrel 7 holds one or a plurality of lens (imaging lens) groups 71.

The movable body 5 includes a cylindrical portion 51, a first flange 52, and a second flange 53. The movable body main body 5 of the present embodiment is formed of a stainless material having a thickness of 0.1 mm to 0.2 mm, for example.

In the cylindrical portion 51, a part of the outer peripheral surface constitutes a first sliding surface (first contact surface) 55 that is in sliding contact with the drive shaft 33. That is, the cylindrical part 51 (movable body main body 5) includes the first sliding surface 55 on the outer peripheral surface thereof. The first sliding surface 55 of the present embodiment has a part of the movable body main body 5 (specifically, a predetermined width in the circumferential direction and the entire center axis C direction) when the movable body main body 5 is molded. ) A flat surface formed by flat plate.

The first flange 52 protrudes radially inward from the lower end of the cylindrical portion 51. The upper surface of the first flange 52 is included in the lens holding surface 54 and constitutes a lens barrel mounting portion 52a. The lens barrel placement portion 52a is a portion where the lens barrel 7 is placed when the lens barrel 7 is held on the lens holding surface 54 (see FIG. 9). In this way, the lens barrel 7 is held on the lens holding surface 54 in a state of being placed on the lens barrel placement portion 52a, so that the central axis of the movable body 5 and the optical axis of the lens group 71 of the lens barrel 7 are obtained. Are aligned without tilting each other. The second flange 53 protrudes radially outward from the upper end of the cylindrical portion 51. The strength of the movable body 5 is ensured by the first flange 52 and the second flange 53.

As described above, the moving body main body 5 is made of metal, and the first flange 52 and the second flange 53 are provided, so that the strength of the moving body main body 5 is sufficiently secured. It is possible to reduce the wall thickness. As a result, it is possible to increase the diameter of the lens 71 held by the movable body 5 (specifically, held via the lens barrel 7). Moreover, since the weight of the moving body 4 can be suppressed by reducing the thickness, the load at the time of applying an impact such as dropping can be reduced.

The guide spring 6 includes an arc portion 61, a guide portion 62 formed at one end of the arc portion 61, and a pressing piece 63 formed at the other end of the arc portion 61. The guide spring 6 of the present embodiment is formed of a stainless material having a thickness of 0.1 mm to 0.2 mm, for example.

The arc portion 61 includes a rotation restricting portion 61a at a position separated from the guide portion 62 by approximately 180 ° in the circumferential direction. The rotation restricting portion 61a is a portion for restricting the rotation of the moving body 4 with the drive shaft 33 as the center of rotation. The rotation restricting portion 61a includes a restricting frame portion 61b and a hemispherical protrusion 61c formed on the restricting frame portion 61b.

The regulation frame portion 61b is formed by projecting a part of the arc portion 61 radially outward in a rectangular shape. The protrusion 61c is formed so as to protrude outward from each of the outer side surfaces of the restriction frame portion 61b. The outer width of the protrusions 61c (the distance between the tips of the protrusions 61c) is such that the restriction frame portion 61b fits into the restriction portion groove 29 provided in the third support column 120c. It is set slightly narrower than the inner width of.

The guide part 62 extends radially outward from one end of the arc part 61. A second sliding surface (second abutting surface) 62 a that is one surface of the guide portion 62 is in relation to the first sliding surface 55 of the movable body 5 with the guide spring 6 attached to the movable body 5. Is approximately 90 °. Thereby, the first and second sliding surfaces 55 and 62a are arranged in a V shape when viewed in the optical axis direction. For this reason, in this embodiment, these two sliding surfaces 55 and 62a may be called a V guide.

The pressing piece 63 extends linearly from the other end of the arc portion 61. The pressing piece 63 includes a pressing portion 63 a that presses the drive shaft 33 at the tip. The pressing part 63 a is thinner than other parts of the pressing piece 63. As a result, the width of the pressing portion 63a in the optical axis C direction is smaller than the width of the first and second sliding surfaces 55 and 62a in the optical axis C direction. As a result, the pressing piece 63 is slightly twisted. Even in this case, the V guide (first and second sliding surfaces 55, 62a) and the outer peripheral surface of the drive shaft 33 can be surely brought into contact with each other, and it is possible to ensure the contact of the two lines in the optical axis C direction.

Next, returning to FIGS. 1 and 2, the cover 8 will be described.

The cover 8 is a member surrounding the moving body 4 in cooperation with the unit main body 2. The cover 8 includes a top wall 81 and a peripheral wall 83 that hangs down from the periphery of the top wall 81. The top wall 81 has a rectangular outline in plan view, and has a through hole 82 penetrating in the central axis C direction at the center thereof. This through hole 82 becomes an optical path. The cover 8 of the present embodiment is formed by drawing, pressing, or the like, for example, a stainless steel thin plate of 0.1 mm to 0.2 mm. The peripheral wall 83 is composed of four side walls 83 a corresponding to the pieces of the top wall 81.

The actuator unit 1 configured as described above is manufactured as follows.

The actuator body 30 is arranged on the unit body 2. More specifically, the actuator main body 30 is fitted into the actuator holding portion 25 of the unit main body 2 (base portion 20) from the weight 31 side. Then, the bottom surface of the actuator holding portion 25 and the weight 31 are bonded together, whereby the actuator main body 30 is fixed to the unit main body 2. At this time, the central axis of the drive shaft 33 of the actuator main body 30 and the central axis C of the unit main body 2 are parallel to each other.

Subsequently, the first electrode coupling spring 26 a and the second electrode coupling spring 26 b are connected to the two external electrodes 32 a facing the piezoelectric element 32. Thereby, the first electrode terminal 22 and the second electrode terminal 23 and the two external electrodes 32 a of the piezoelectric element 32 are electrically connected. At this time, a conductive adhesive in which silver particles are mixed in an epoxy adhesive is connected to the external electrode 32a and the first electrode connection that contacts the external electrode 32a at the joint portion between the external electrode 32a and each of the electrode connection springs 26a and 26b. It is applied so as to contact the spring 26a or the second electrode coupling spring 26b. Thereby, the elastic force applied to the external electrode 32a from each electrode connection spring 26a, 26b is reduced, and creep over time can be suppressed. Since the adhesive strength of the conductive adhesive is low, a UV adhesive or the like may be applied on and around the conductive adhesive for reinforcement.

Next, the movable body 4 is formed by the movable body main body 5 and the guide spring 6. More specifically, it is as follows.

The movable body 5 is formed by, for example, drawing or pressing, and thereafter the posture of the first sliding surface 55 with respect to the lens holding surface 54 and the like is corrected. Specifically, this posture correction is performed as follows. In the following description, when the lens barrel 7 is fitted into the movable body 5 such as the lens holding surface 54 (including the lens barrel mounting portion 52a), the lens barrel 7 abuts. A surface that determines the posture of each lens 71 (optical component) in the movable body 5 (movable body 4) is referred to as a posture defining surface.

As shown in FIG. 10, first, the mobile body 5 is fitted (externally fitted) from the upper side to the moving shaft 90 with the first flange 52 side facing upward. The moving shaft 90 has a shape corresponding to the shape of the inner peripheral surface (lens holding surface) 54 of the movable body 5, that is, a shape that can be fitted to the movable body 5 without rattling. The moving shaft 90 is configured to be movable in a direction orthogonal to the axial direction of the moving shaft 90 toward the member (fixed member) 95 provided with the first reference surface 96.

When the moving body 5 is fitted on the moving shaft 90 in this way, the first sliding surface 55 of the moving body 5 faces the first reference surface 96. The first reference surface 96 has a predetermined posture (for example, a posture corresponding to the posture of the first sliding surface 55 with respect to the posture defining surface planned in the design) with respect to the posture defining surface.

When the moving body 5 is fitted on the moving shaft 90, as shown in FIG. 11, the holding member 92, which is a columnar member having a diameter larger than that of the moving body 5, is on the first flange 52 side of the moving body 5. Hold the end downward. The magnitude of the force with which the pressing member 92 presses the movable body main body 5 is such that the movable body main body 5 does not lift upward from the fitting position with the moving shaft 90. Thereby, it is possible to prevent the movable body main body 5 from being detached from the movable shaft 90 when the movable body main body 5 is sandwiched between the movable shaft 90 and the fixing member 95. The pressing member 92 is configured to be movable toward the fixed member 95 together with the moving shaft 90 while the end of the movable body 5 on the first flange 52 side is pressed toward the moving shaft 90.

Next, the moving shaft 90 moves together with the pressing member 92 toward the fixed member 95, and the portion having the first sliding surface 55 in the moving body 5 is sandwiched between the first reference surface 96 and the moving shaft 90. This sandwiching, that is, pressing the portion having the first sliding surface 55 in the movable body 5 against the first reference surface 96 causes the entire first sliding surface 55 to be pressed against the first reference surface 96 to bring it into surface contact. To do. Thus, the first sliding surface 55 becomes the predetermined posture (relative posture planned in the design) with respect to the posture defining surface. That is, the posture of the first sliding surface 55 with respect to the posture defining surface is corrected. In the present embodiment, the force with which the moving shaft 90 presses a part of the moving body 5 (the portion including the first sliding surface 55) against the first reference surface 96 is, for example, preferably 500 to 1500 gf. .

Subsequently, a portion adjacent to the circumferential direction with respect to a portion sandwiched between the first reference surface 96 and the moving shaft 90 (a portion on both sides in the circumferential direction of the first sliding surface 55) is irradiated with a laser beam and heated, Melt. At this time, the laser beam is irradiated while moving the irradiation position from one end in the optical axis C direction to the other end (for example, from the first flange 52 side end in FIG. 12A to the second flange 53 side end). For example, if the movable body 5 is a SUS material having a plate pressure of 0.1 mm, a 50 W YAG laser beam is irradiated with an irradiation energy of 1 to 2 J.

The part irradiated with the laser beam is heated and melted, but immediately after the irradiation with the laser beam, it cools and solidifies. The stress generated by setting the first sliding surface 55 to the predetermined posture with respect to the posture defining surface is removed by the melting. After that, the part solidifies so that the posture of the first sliding surface 55 with respect to the posture defining surface is corrected in the movable body 5 and the posture of the first sliding surface 55 with respect to the posture defining surface is as designed. A highly accurate mobile body 5 is obtained. Here, in the present embodiment, making the postures of the first and second sliding surfaces 55, 62a with respect to the posture defining surface as designed is referred to as “correction” of the posture, and the stress generated by this correction is melted. The removal and then solidification is referred to as “correction” of the posture.

In addition, it is not necessary to irradiate a laser beam over the whole optical-axis C direction, for example, the predetermined range (In this embodiment, the 1st flange 52 side edge part) as shown in FIG. You may irradiate a laser beam only to a part of the optical axis C direction. When the position of the first sliding surface 55 with respect to the posture defining surface is corrected by sandwiching the portion including the first sliding surface 55 in the short cylinder-shaped moving body 5, it is adjacent to the portion including the first sliding surface 55. Stress tends to concentrate on the end of the region in the direction of the optical axis C. For this reason, by melting the portion including the portion where stress is easily concentrated, the stress generated by the correction can be effectively removed while suppressing the melting range. In FIG. 12B, the predetermined range including the end portion on the first flange 52 side is shown, but the predetermined range including the end portion on the second flange 53 side may be irradiated with the laser beam.

When the posture of the first sliding surface 55 is corrected, the guide spring 6 and the movable body 5 are connected (coupled) by welding, and thereafter the posture of the second sliding surface 62a with respect to the posture defining surface is corrected. As a result, the movable body 4 is completed. Details are as follows.

The guide spring 6 is disposed along the outer periphery of the movable body 5 so that the first sliding surface 55 of the movable body 5 and the second sliding surface 62a of the guide spring 6 are adjacent to each other. As a result, the first sliding surface 55 and the second sliding surface 62a are adjacent to each other so as to be in contact with the circumferential surface of the drive shaft 33, and the normal lines intersect with each other, and the respective normal lines are light-transmitted. The axes C are orthogonal to each other. That is, the first and second sliding surfaces 55 and 62a are arranged in a V shape when viewed in the direction of the optical axis C as described above. In this state, the guide spring 6 and the movable body 5 are connected by welding a plurality of locations (for example, resistance welding (spot welding), laser welding, etc.). In this embodiment, the moving body 5 is spot-welded by, for example, laser welding or resistance welding (spot welding). In the example of the present embodiment, the vicinity of the guide portion 62 of the guide spring 6, the vicinity of the rotation restricting portion 61 a, the vicinity of the base portion of the pressing piece 63, and the like are welded to the moving body 5. In this way, the movable body 5 and the guide spring 6 are connected by welding, so that the mobile body 5 and the guide spring 6 can be firmly connected to each other, and can be instantaneously connected unlike the bonding and the like. Can be greatly shortened.

The welded mobile body 5 and the guide spring 6 are re-fitted to the moving shaft 90 as shown in FIG. At this time, the second sliding surface 62 a of the moving body 5 faces the second reference surface 97 provided on the fixing member 95. The second reference surface 97 is substantially orthogonal to the first reference surface 96 in the fixing member 95 and has a predetermined posture with respect to the posture defining surface (in the example of the present embodiment, the posture defining scheduled in the design). And a posture corresponding to the posture of the second sliding surface 62a with respect to the surface).

Subsequently, the rotation limiting member 100 that has been waiting at a standby position that is radially away from the moving shaft 90 moves forward toward the axis of the moving shaft 90, and the guide spring 6 enters the recess 105 provided at the tip thereof. The rotation restricting portion 61a is fitted. Thereby, the rotation around the optical axis C of the movable body 4 (welded movable body main body 5 and guide spring 6) is suppressed. Further, as in the case of correcting the posture of the first sliding surface 55, the pressing member 92 presses the end of the movable body 5 on the first flange 52 side toward the moving shaft 90 (see FIG. 11).

In this state, the pressing member 110 moves so that the claw 112 protruding from the pressing member 110 faces the fixing member 95 (see the arrows in FIGS. 13 and 14), and the second reference surface 97 and the claw 112 Thus, the guide portion 62 (that is, the portion having the second sliding surface 62a in the guide spring 6) is sandwiched. By this sandwiching, that is, by pressing the guide portion 62 against the second reference surface 97, the entire second sliding surface 62a is pressed against the second reference surface 97 to come into surface contact. Thereby, the second sliding surface 62a becomes the predetermined posture (relative posture planned in the design) with respect to the posture defining surface. That is, the posture of the second sliding surface 62a with respect to the posture defining surface is corrected.

Subsequently, the vicinity of the guide portion 62 (a portion adjacent in the circumferential direction) of the guide spring 6 as shown in FIGS. 15A and 15B is irradiated with a laser beam to be heated and melted. At this time, the laser beam is irradiated while moving the irradiation position from one end in the optical axis C direction to the other end (for example, from the first flange 52 side end in FIG. 15A to the second flange 53 side end). For example, if the guide spring 6 is a SUS material having a plate pressure of 0.1 mm, a 50 W YAG laser beam is irradiated with an irradiation energy of 1 to 2 J.

The part irradiated with the laser beam is heated and melted, but immediately after the irradiation with the laser beam, it cools and solidifies. The stress generated by setting the second sliding surface 62a to the predetermined posture with respect to the posture defining surface is removed by the melting. Thereafter, the part solidifies, so that in the guide spring 6, the posture of the second sliding surface 62a with respect to the posture defining surface is corrected, and the posture of the second sliding surface 62a with respect to the posture defining surface is as designed. The moving body 4 with high accuracy is completed.

The laser beam does not have to be irradiated over the entire optical axis C direction. For example, the laser beam is irradiated to a predetermined range (a part in the optical axis C direction) including one end as shown in FIG. 15B. May be. When the guide portion 62 is sandwiched in the short cylindrical guide spring 6 to correct the posture of the second sliding surface 62a relative to the posture defining surface, the optical axis C direction in the region adjacent to the portion including the second sliding surface 62a is corrected. Stress tends to concentrate on the edge. For this reason, by melting the portion including the portion where the stress tends to concentrate, the stress generated by the correction can be effectively removed while suppressing the melting range. Further, in FIG. 15B, the predetermined range including the upper end portion is used, but the predetermined range including the lower end portion may be irradiated with the laser beam.

As described above, the movable body 4 after the postures of the first and second sliding surfaces 55 and 62a with respect to the posture defining surface are corrected, the rotation restricting portion 61a is restricted by the unit main body 2 (third column portion 120c). The drive shaft 33 is disposed so as to be fitted in the groove 29 for part and surrounded by the first sliding surface 55, the second sliding surface 62a, and the pressing portion 63a. At this time, the pressing piece 63 is in a state of extending to the first support 120a of the first corner 20a through the outside of the second support 120b of the unit body 2. In this state, the pressing portion 63a of the pressing piece 63 is at an initial position (a position in a state where the drive shaft 33 is not surrounded by the first sliding surface 55, the second sliding surface 62a, and the pressing portion 63a). Since the elastic body is elastically deformed in the direction away from the outer peripheral surface of the movable body 5, the drive shaft 33 is pressed against the first sliding surface 55 and the second sliding surface 62 a by the elastic restoring force (elastic force); It has become. That is, the driving shaft 33 is pressed against the first sliding surface 55 and the second sliding surface 62a by the elastic force of the pressing piece 63, and the movable body 4 and the driving shaft 33 are frictionally engaged.

The contact portion between the drive shaft 33 and the first sliding surface 55 and the second sliding surface 62a of the moving body 4 and the contact portion between the rotation restricting portion 61a and the restricting portion groove 29 of the moving body 4 are provided with oil. A lubricant such as oil mixed with grease, Teflon (registered trademark) flakes or the like is applied. Thereby, the durability improvement of a sliding part and the reliability with respect to adhering at the time of leaving are securable.

Finally, the cover 8 is put on and the actuator unit 1 is completed.

As shown in FIG. 9, the actuator unit 1 manufactured as described above has the lens barrel 7 fitted in the lens holding surface 54 of the moving body 4, and the IR cut filter 102 and the lower surface side of the unit body 2. A sensor substrate 104 having an image sensor (image sensor) 103 is disposed. More specifically, the lens barrel 7 is bonded and fixed to the lens holding surface 54 by the adhesive 73 filled in the bonding groove 72 provided in the lens barrel 7. Thereby, a camera module (imaging device) is configured.

Then, for example, the camera module is carried in such a manner that the external connection terminal 22b of the first electrode terminal 22 and the external connection terminal 23b (see FIG. 1 etc.) of the second electrode terminal 23 are placed on the circuit board of the mobile phone. Installed in the phone casing.

When electric power having a predetermined waveform is supplied from the drive circuit to the external connection terminal 22b of the first electrode terminal 22 and the external connection terminal 23b of the second electrode terminal 23 in the state of being installed in this way, the piezoelectric of the actuator body 30 is supplied. The element 32 vibrates in the direction of the central axis C (extends and contracts repeatedly). The drive shaft 33 reciprocates due to the vibration of the piezoelectric element 32, and the movable body 4 moves in the axial direction (center axis C direction) of the drive shaft 33 due to the reciprocation. Details are as follows.

When a rectangular wave having a predetermined duty ratio is applied to the piezoelectric element 32, the displacement of the piezoelectric element 32 becomes a triangular wave. By changing the duty ratio of the rectangular wave, the slope (speed) is increased and decreased when the amplitude is increased. ) Different triangular waves are generated. The drive mechanism of the actuator 3 utilizes this. Below, the case where the mobile body 4 goes to an infinite imaging | photography position from a short distance imaging | photography position, for example is demonstrated concretely. The short-distance shooting position is a position farthest from the base 20 (imaging sensor 103) in the movement range of the moving body 4 in the central axis C direction, and the infinite shooting position is the base 20 (imaging sensor) in the movement range. 103).

First, when the drive shaft 33 is slowly moved downward by the reduction of the piezoelectric element 32, the moving body 4 that is frictionally engaged with the drive shaft 33 also moves in the same direction (downward as the drive shaft 33 moves downward). ) Then, when the drive shaft 33 is moved upward by the instantaneous extension of the piezoelectric element 32 so as to exceed the frictional friction force, the movable body 4 is left at that position (the position after the downward movement). . By repeating such reciprocation of the drive shaft 33 in the direction of the central axis C, the moving body 4 moves downward.

According to the manufacturing method of the actuator unit 1 and the moving body 4 manufactured by this method, the postures of the first and second sliding surfaces 55 and 62a with respect to the posture defining surface (the lens holding surface 54 and the like) are designed values ( Even if it is different from the relative posture planned at the time of design, by correcting the postures of the first and second sliding surfaces 55 and 62a with respect to the posture defining surface according to the design value, the moving body 4 with high component accuracy can be obtained. can get. In the actuator unit 1 manufactured using the moving body 4 with high component accuracy obtained in this way, the posture of the lens (optical component) 71 with respect to the drive shaft 33 is as designed (relative posture planned in the design). Therefore, the accuracy in the optical axis C direction of the lens 71 with respect to the axial direction of the drive shaft 33 (moving direction of the moving body 4) is sufficiently obtained. For this reason, according to the actuator unit 1 manufactured by the manufacturing method, the accuracy in the optical axis C direction of the lens 71 in the imaging device or the like can be sufficiently ensured only by being incorporated in the imaging device or the like.

Moreover, the movable body 4 is pressed to correct the postures of the first and second sliding surfaces 55 and 62a with respect to the posture defining surface, and the stress generated at this time is easily removed by melting the portion where the stress is generated. Since the postures of the first and second sliding surfaces 55 and 62a with respect to the posture-defining surface can be corrected by a simple process, the manufacturing cost (processing cost) can be suppressed even when the component accuracy of the movable body 4 is sufficiently secured. be able to.

It should be noted that the actuator unit manufacturing method and the moving body of the present invention are not limited to the above-described embodiment, and it is needless to say that various changes can be made without departing from the scope of the present invention.

The specific configuration for correcting the postures of the first and second sliding surfaces 55 and 62a with respect to the posture defining surface is not limited. In the above-described embodiment, the first and second sliding portions are sandwiched by sandwiching the portion including the first sliding surface 55 of the movable body 5 or the portion (guide portion 62) having the second sliding surface 62a of the guide spring 6. Although the postures of the surfaces 55 and 62a have been corrected, the configuration for correcting the posture is, for example, as shown in FIG. The structure which presses the 1st flange 52 side edge part toward the 2nd flange 53 side edge part may be sufficient. In this case, the pressing member 92 presses the movable body 5 downward with, for example, 200 to 500 gf. Thereby, the end part on the second flange 53 side is expanded in the radial direction. While measuring the angle of the first sliding surface 55 in the optical axis direction with a laser shape measuring machine LM or the like, the pressing member 92 is pressed downward while gradually increasing the pressing force, and the first sliding surface 55 in the optical axis direction. The posture is corrected by holding the pressing force when the angle falls within a predetermined range. In this state, the both sides of the first sliding surface 55 in the circumferential direction are melted and then solidified, whereby the posture of the first sliding surface 55 with respect to the posture defining surface can be corrected.

Moreover, in the said embodiment, although the attitude | position of the 1st sliding surface 55 and the attitude | position of the 2nd sliding surface 62a are correct | amended in order, for example, the attitude | position of the 1st and 2nd sliding surfaces 55 and 62a is correct | amended. It may be corrected simultaneously. In this case, for example, in the state shown in FIG. 14, the moving shaft 90 is moved toward the first reference surface 96, and the first sliding surface of the movable body 5 is moved between the first reference surface 96 and the moving shaft 90. 55, and the pressing member 110 is moved so that the claw portion 112 faces the second reference surface 97, and the guide portion 62 is interposed between the second reference surface 97 and the claw portion 112. Then, the first and second sliding surfaces 55 and 62a can be corrected simultaneously by melting and solidifying the vicinity (parts adjacent in the circumferential direction) of the sandwiched parts.

Further, in the above embodiment, in order to melt part of the movable body 5 and the guide spring 6 (part where the stress is generated), the part is irradiated with the laser beam, but the present invention is not limited to this configuration. For example, an electric current may be passed through the site where the stress is generated, and the site may be melted using heat generated by the electrical resistance of the site.

Further, the movable body 5 and the guide spring 6 of the above embodiment are made of metal, but may be made of resin. Also with such a configuration, the stressed portion can be heated and softened (or melted) to remove the stress, and then be cooled and hardened.

Moreover, in the said embodiment, although both the attitude | position of the 1st sliding face 55 and the attitude | position of the 2nd sliding face 62a are correct | amended, either (the 1st sliding face 55 or the 2nd sliding face) Only the posture of 62a) may be corrected. When the component accuracy required for the product (actuator unit 1) is not so high, the required component accuracy can be satisfied by correcting one of the postures.

Further, as shown in FIG. 17, a portion 65 having a width in the optical axis C direction smaller than other portions (a portion adjacent in the circumferential direction) may be formed in the vicinity of the guide portion 62 of the guide spring 6A. . For example, the narrow portion 65 is formed by forming the groove 66 from one end in the direction of the optical axis C to the other end. The groove 66 may have a component extending in the optical axis C direction and may be inclined with respect to the optical axis C direction. According to such a configuration, when the posture of the second sliding surface 62a with respect to the posture defining surface is corrected, stress concentrates on the portion 65 having the small width. Therefore, by melting the portion 65 having the small width, The stress generated by correcting the posture of the two sliding surfaces 62a can be removed. That is, by providing the portion 65 having the small width, the melting range can be reduced, and the stress can be reliably removed by melting the portion 65.

In the above embodiment, the posture of the second sliding surface 62a is corrected after the guide spring 6 is welded to the movable body 5. However, the present invention is not limited to this configuration. For example, the configuration may be such that the stress generated in the guide spring 6 due to the correction of the posture of the second sliding surface 62a and the welding of the guide spring 6 to the movable body 5 are performed simultaneously. For example, more specifically, a portion of the guide spring 6 where stress is generated when the posture of the second sliding surface 62a with respect to the posture defining surface is corrected, and the movable body 5 that overlaps this portion in the radial direction. The parts are melted together. In this case, for example, by irradiating a 50 W YAG laser beam with an irradiation energy of 3 to 5 J, the portions overlapping in the radial direction can be melted together.

Thus, after the portions overlapping in the radial direction are melted together, the portions are cooled and solidified, whereby the irradiated portions of the laser beam are connected (bonded) (welded).

In the above embodiment, there are two surfaces (contact surfaces) of the moving body 4 that are in sliding contact (contact) with the drive shaft 33 (first and second sliding surfaces), but one or three may be used. It may be the above.

This specification discloses various modes of technology as described above, and the main technologies are summarized below.

A method for manufacturing an actuator unit according to one aspect includes a movable body having a short cylindrical shape and movable in a state where an optical component is fitted therein, and a drive shaft. An actuator unit that incorporates an actuator having an actuator body that drives in the axial direction, and is included in the surface of the moving body and comes into contact with the driving shaft to contact the driving body with respect to the driving shaft Of the movable body so that the contact surface that defines the position is included in the surface of the movable body excluding the contact surface and has a predetermined posture with respect to the posture defining surface that defines the posture of the optical component in the movable body. In the posture correcting step of pressing at least part of the moving body in the pressed state, a portion where stress is generated by the pressing is melted and then solidified. And a stress relief step of removing the stress by causing.

According to this configuration, even if the posture of the contact surface with respect to the posture defining surface is different from the design value (relative posture planned at the time of design), the posture of the contact surface with respect to the posture defining surface is corrected as designed. Thus, a moving body with high component accuracy is obtained. In the actuator unit manufactured using the moving part with high component accuracy obtained in this way, the posture of the optical component with respect to the drive shaft is as designed (relative posture planned in the design). The accuracy of the optical axis direction of the optical component with respect to the axial direction (moving direction of the moving body) is sufficiently obtained. For this reason, according to the actuator unit manufactured by the manufacturing method, the accuracy in the optical axis direction of the optical component in the imaging device or the like can be sufficiently ensured only by being incorporated in the imaging device or the like.

In addition, the posture of the contact surface with respect to the posture defining surface is corrected by pressing the moving body, and the stress generated at this time is removed against the posture defining surface by melting and removing the portion where the stress is generated. Since the posture of the contact surface can be corrected, the manufacturing method can suppress the manufacturing cost (processing cost) even if the parts accuracy of the moving body is sufficiently ensured.

In another aspect, in the method for manufacturing an actuator unit described above, in the posture correction step, the contact surface of the movable body is such that the contact surface contacts a reference surface having a posture corresponding to the predetermined posture. It is preferable to press a portion having the reference surface against the reference surface, thereby bringing the contact surface into surface contact with the reference surface.

In this way, the manufacturing method can change the relative posture of the contact surface with respect to the posture defining surface by a simple method of pressing a part of the moving body toward the reference surface and bringing the contact surface into surface contact with the reference surface. It can be easily and reliably corrected.

In this case, in the posture correction step, for example, the portion having the contact surface is sandwiched between the reference surface and the pressing surface facing the reference surface so that the portion having the contact surface becomes the reference surface. Can be pressed.

In this case, in the stress relieving step, after melting a part in the optical axis direction, which is adjacent to the portion having the contact surface of the moving body in the circumferential direction and includes one end portion in the optical axis direction, It is preferable to solidify.

If the position of the contact surface with respect to the posture defining surface is corrected by sandwiching the portion having the contact surface in the short cylinder-shaped moving body, stress is applied to one end in the optical axis direction of the region adjacent to the portion having the contact surface. Is easy to concentrate. For this reason, by melting a portion in the optical axis direction including a portion where the stress is likely to concentrate, the manufacturing method can effectively remove the stress generated by the correction while suppressing the melting range. .

In another aspect, in the above-described manufacturing method of the actuator unit, the accuracy of the posture of the movable body with respect to the axial direction of the drive shaft is further increased by bringing the two contact surfaces into contact with the peripheral surface of the drive shaft. In this case, the contact surface of the moving body includes a first contact surface and a second contact surface that can contact the drive shaft, respectively, and the first contact surface and the second contact surface. Are arranged in such a manner that they are adjacent to each other so as to be in contact with the peripheral surface of the drive shaft, so that their normal lines intersect and each normal line is orthogonal to the optical axis. At this time, if the posture of at least one of the first contact surface and the second contact surface with respect to the posture defining surface is corrected in the posture correction step and the stress removal step, the component accuracy of the moving body is ensured. It becomes possible to do. That is, when the component accuracy required for the actuator unit is not so high, the required component accuracy can be satisfied by correcting the posture of one of the contact surfaces.

In another aspect, in the above-described manufacturing method of the actuator unit, the peripheral wall can be made thin while ensuring the strength of the moving body by forming the moving body with a metal. Thereby, the said manufacturing method can make a moving body hold | maintain an optical component with a larger diameter, without enlarging the outer dimension of a moving body.

When such a moving body manufactures an actuator unit made of metal (including an alloy), for example, in the stress removal step, the stressed portion may be melted by irradiation with a laser beam, and the stress Alternatively, the current may be melted by causing a current to flow through the site where the stress occurs and causing the site where the stress occurs to generate heat.

In another aspect, in the above-described manufacturing method of the actuator unit, the moving body has a portion having a smaller width in the optical axis direction in a region adjacent to the portion having the contact surface. Thus, when the posture of the contact surface with respect to the posture defining surface is corrected in the posture correcting step, stress can be concentrated on the small part. And in the said stress removal process, the said manufacturing method can remove the said stress more reliably and effectively by melting the said small site | part and solidifying it.

In another aspect, in the above-described manufacturing method of the actuator unit, the movable body is disposed so as to surround the movable body having a short cylindrical shape and the movable body, and the drive shaft is pushed against the contact surface. And an abutting pressing member. In this case, in the stress removing step, in the movable body, a portion where stress is generated when the posture of the contact surface with respect to the posture defining surface is corrected in the posture correcting step, and the movement of the pressing member. By melting and then solidifying the part of the body main body where the stress is generated and the part overlapping in the radial direction, the stress can be removed and the moving body main body and the pressing member can be welded simultaneously. .

A moving body of an actuator unit according to another aspect is a moving body that is incorporated in an actuator unit and is driven in the axial direction by a drive shaft of an actuator while holding an optical component, and has a short cylindrical shape. A contact surface that is included on the surface of the moving body and determines the posture of the moving body with respect to the drive shaft by contacting the drive shaft is included in the surface of the moving body except the contact surface, and At least a part of the movable body is pressed so as to be in a predetermined posture with respect to the posture defining surface that defines the posture of the optical component, and the portion where the stress is generated is melted to remove the stress generated thereby. After being made, it has a trace caused by being solidified. The actuator unit according to another aspect includes the above-described moving body.

According to such a configuration, even when the posture of the contact surface with respect to the posture defining surface is different from the design value (relative posture planned at the time of design) at the time of manufacturing the mobile body, the posture of the contact surface with respect to the posture defining surface is changed. Since it is corrected according to the design value, a moving body with high component accuracy can be obtained. When an actuator unit is manufactured using a moving body with high component accuracy obtained in this way, the posture of the optical component with respect to the drive shaft becomes the design value (relative posture planned in the design). For this reason, in the actuator unit, the accuracy of the optical axis direction of the optical component with respect to the axial direction of the drive shaft (moving direction of the moving body) is sufficiently obtained. It becomes possible to ensure sufficient accuracy in the axial direction.

In addition, the posture of the contact surface with respect to the posture defining surface is corrected by pressing the moving body, and the stress generated at this time is removed against the posture defining surface by melting and removing the portion where the stress is generated. Since the posture of the contact surface is corrected, the manufacturing cost (processing cost) can be suppressed even if the component accuracy of the moving body is sufficiently ensured.

This application is based on Japanese Patent Application No. 2013-106154 filed on May 20, 2013, the contents of which are included in this application.

In order to express the present invention, the present invention has been appropriately and fully described above with reference to the drawings. However, those skilled in the art can easily change and / or improve the above-described embodiments. It should be recognized that this is possible. Therefore, unless the modifications or improvements implemented by those skilled in the art are at a level that departs from the scope of the claims recited in the claims, the modifications or improvements are not covered by the claims. To be construed as inclusive.

According to the present invention, it is possible to provide a method of manufacturing an actuator unit, a moving body of the actuator unit, and an actuator unit having the same.

Claims (12)

1. A movable body having a short cylindrical shape and movable while holding an optical component inside thereof, and an actuator main body having a drive shaft and driving the movable body in the axial direction by the drive shaft A method of manufacturing an actuator unit incorporating an actuator,
   A contact surface that is included on the surface of the movable body and that determines the posture of the movable body with respect to the drive shaft by contacting the drive shaft is included in the surface of the movable body excluding the contact surface, and the movable body includes the contact surface. A posture correcting step of pressing at least a part of the movable body so as to have a predetermined posture with respect to a posture defining surface that determines a posture of the optical component;
   A stress removing step of removing the stress by solidifying the portion where the stress is generated by the pressing in the moving body in the pressed state,
   Actuator unit manufacturing method.
2. In the posture correcting step, a portion having the contact surface in the movable body is pressed against the reference surface so that the contact surface is in contact with a reference surface having a posture corresponding to the predetermined posture. Bringing the contact surface into surface contact with the reference surface;
   A method for manufacturing the actuator unit according to claim 1.
3. In the posture correction step, the portion having the contact surface is pressed against the reference surface by sandwiching the portion having the contact surface between the reference surface and a pressing surface facing the reference surface.
   A method for manufacturing the actuator unit according to claim 2.
4. In the stress relieving step, after melting a part in the optical axis direction, which is adjacent to the portion having the contact surface of the moving body in the circumferential direction and includes one end portion in the optical axis direction, the solidified.
   The manufacturing method of the actuator unit of Claim 3.
5. The contact surface includes a first contact surface and a second contact surface that can contact the drive shaft, respectively.
   The first abutment surface and the second abutment surface are adjacent to each other so that they can abut on the peripheral surface of the drive shaft. Are arranged to be orthogonal to each other,
   In the posture correcting step and the stress removing step, a posture of at least one of the first contact surface and the second contact surface with respect to the posture defining surface is corrected.
   The method for manufacturing the actuator unit according to any one of claims 1 to 4.
6. The moving body is made of metal,
   The method for manufacturing an actuator unit according to any one of claims 1 to 5.
7. In the stress removal step, the stressed portion is melted by laser beam irradiation.
   A method for manufacturing the actuator unit according to claim 6.
8. In the stress relieving step, a current is passed through the stressed part to melt the stressed part to generate heat,
   A method for manufacturing the actuator unit according to claim 6.
9. The moving body has a portion that is smaller than a portion adjacent to the width of the optical axis in a region adjacent to the portion having the contact surface,
   In the stress relief step, the small part is melted and then solidified.
   The method for manufacturing an actuator unit according to any one of claims 1 to 7.
10. The movable body has a short cylindrical movable body main body, and a pressing member that is disposed so as to surround the movable body main body and presses the drive shaft against a contact surface,
    In the stress relief step,
    In the movable body main body, a portion where stress is generated when the posture of the contact surface with respect to the posture defining surface is corrected in the posture correction step, and a portion where stress of the movable body main body is generated in the pressing member. After melting the part overlapping in the radial direction, solidify,
    The method for manufacturing an actuator unit according to any one of claims 1 to 9.
11. A moving body incorporated in an actuator unit and driven in the axial direction by a drive shaft of an actuator while holding an optical component;
    A contact surface that is included in the surface of the movable body having a short cylindrical shape and determines the posture of the movable body with respect to the drive shaft by contacting the drive shaft is included in the surface of the movable body excluding the contact surface. In addition, at least a part of the moving body is pressed so as to be in a predetermined posture with respect to a posture defining surface that determines the posture of the optical component in the moving body, and the stress is generated to remove the stress generated thereby. After the site where the
    Actuator unit moving body.
12. An actuator unit having the actuator unit moving body according to claim 11.

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