JP2010273398A - Welding resin body and driver - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a welding resin body which allows the user to perform sure laser welding processing, without causing defective welding, and additionally, excels in productivity, and moreover, to provide a driver which uses a welding technique related to the welding resin body. <P>SOLUTION: The welding resin body includes a first bobbin 5 consisting of, for example, a laser-beam transmitting resin, and an intermediate member 10, consisting of a laser beam fusing resin. The welding resin body has a superimposed section where the first bobbin 5 and the intermediate member 10 are superimposed on each other, and the superimrposed section has a first superimposed section which is welded by a laser beam that irradiates the intermediate member 10 from the side of the first bobbin 5, and a second superimposed section which is positioned by the first bobbin 5 and the intermediate member 10 engaging with each other, and these two sections are energized, in a direction of pressure-welding each other with reaction by elastic transformation. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to an improvement in a welding structure of a welded resin body in which two resin members are welded by a laser resin welding method, and a drive device used as a stepping motor or an actuator using a welding technique related to the welded resin body. The present invention relates to an improvement in a structure in which two bobbins are provided and the two bobbins are directly or indirectly welded by a laser resin welding method.

  In recent years, with the miniaturization of various devices, the drive devices such as stepping motors and actuators incorporated in the devices are inevitably required to be miniaturized. Along with this, it is required to improve the assembly accuracy and drive accuracy of the drive device, and further to improve productivity.

  A stepping motor has been proposed as one of drive devices that meet such requirements (see, for example, Patent Document 1). The stepping motor disclosed in Patent Document 1 will be described below with reference to the drawings. 16 is an exploded perspective view showing a schematic configuration of the stepping motor disclosed in Patent Document 1. FIG. 17 is a cross-sectional view showing a schematic internal structure of the stepping motor in the axial direction.

  The stepping motor shown in FIGS. 16 and 17 includes a magnet 101, a core 102, a rotating shaft 103, two bearings 104, a first bobbin 105, a first stator 106, and a second bobbin 107. And the second stator 108.

  The magnet 101 has a cylindrical shape, and has an outer peripheral surface divided into N in the circumferential direction and a magnetized portion (not shown) in which S poles and N poles are alternately magnetized. The core 102 is made of a soft magnetic material such as electromagnetic soft iron. The magnet 101, the core 102, and the rotating shaft 103 constitute a rotor unit (rotating shaft unit).

  The first bobbin 105 is formed by injection molding a resin having heat resistance such as liquid crystal polymer and milky white and laser light transmission. The first bobbin 105 includes an inner peripheral portion 105a that fits with a jetty-shaped portion 107a (described later) of the second bobbin 107, and a coil winding frame portion 105b that winds a first coil (not shown). I have. Further, the first bobbin 105 includes a center hole 105c opened at the central portion of the shaft center, and a plurality of holes 105d through which a plurality of magnetic pole portions 106a (described later) of the first stator 106 pass.

  The first stator 106 is formed with a magnetic pole part 106 a made of a soft magnetic material, and the bearing 104 is formed with a bearing part 104 a and a flange part 104 b for bearing the rotating shaft 103.

  In the assembly of the stepping motor, the magnetic pole portion 106a of the first stator 106 is passed through the hole portion 105d of the first bobbin 105. Then, after the cylindrical portion of one bearing 104 is passed through the center hole 105 c of the first bobbin 105, it is press-fitted into the center hole 106 b of the first stator 106. By this assembling step, the first bobbin 105 and the first stator 106 are fixed by the one bearing 104 in a predetermined positional relationship between the radial direction and the axial direction. Thus, the first stator unit is configured.

  The second bobbin 107 is formed by injection molding a laser beam meltable resin to which laser beam absorption is imparted by mixing black carbon or the like into a heat resistant material such as a liquid crystal polymer. As is clear from FIGS. 16 and 17, the shapes of the first bobbin 105 and the second bobbin 107 are different.

  The second bobbin 107 includes a jetty-shaped portion 107a that fits with the inner peripheral portion 105a of the first bobbin 105, and a coil winding frame portion 107b that winds a second coil (not shown). The second bobbin 107 includes a center hole 107c that is opened at the central portion of the shaft center, and a plurality of holes 107d through which a plurality of magnetic pole portions 108a (described later) of the second stator 108 pass. The second stator 108 is formed with a magnetic pole portion 108 a made of a soft magnetic material, and the bearing 104 is formed with a bearing portion 104 a and a flange portion 104 b that support the rotating shaft 103.

  In the assembly of the stepping motor, the magnetic pole part 108a of the second stator 108 is passed through the hole 107d of the second bobbin 107. Further, after the cylindrical portion of the other bearing 104 passes through the center hole 107 c of the second bobbin 107, it is press-fitted into the center hole 108 b of the second stator 108. By this assembling process, the second bobbin 107 and the second stator 108 are fixed by the other bearing 104 in a predetermined positional relationship between the radial direction and the axial direction. Thus, the second stator unit is configured.

  Further, the rotary shaft 103 of the rotor unit is fitted to the inner diameter of the bearing 104 of the first stator unit and the inner diameter of the bearing 104 of the second stator unit from the front and rear in the axial direction, and the inner circumference of the first bobbin 105 is fitted. The pier-shaped portion 107a of the second bobbin 107 is fitted into the portion 105a. Thus, the pre-assembly process of the stepping motor is completed. In the subsequent process, from the first bobbin 105 side to the overlapped part where the inner peripheral part 105a of the first bobbin 105 and the jetty-shaped part 107a of the second bobbin 107 are overlapped by the pre-assembly process. Laser beam LQ irradiation is performed to weld the overlapped portion. Thus, the stepping motor is completed.

  That is, in the stepping motor disclosed in Patent Document 1, in the step of welding the first and second bobbins 105 and 107, the first and second bobbins 105 and 107 are fitted to each other. By positioning the peripheral portion 105a and the pier-shaped portion 107a of the second bobbin on the same axis, they are positioned coaxially with each other, and the overlapped portion is irradiated with laser light to weld and fix the first and second bobbins 105 and 107. I am letting.

JP2007-068267

  However, the stepping motor having the above-described structure disclosed in Patent Document 1 has a problem described below with reference to FIGS. 18 and 19. 18 is an enlarged cross-sectional view showing an example of a welded state after laser welding of the stepping motor shown in FIG. 16, and FIG. 19 is a welded state of the welded portion after laser welding of the stepping motor shown in FIG. It is a cross-sectional enlarged view which shows another example of.

  That is, when the pier-shaped portion 107a of the second bobbin 107 is irradiated with the laser beam LQ to melt the pier-shaped portion 107a, the melted and expanded resin is pier-shaped and easily bent as shown in FIG. The part 107a is bent inward. This phenomenon is likely to occur even if the dimensions are controlled fairly strictly so that no dimensional error occurs in the fitting portions of the first and second bobbins 105 and 107. If the axial centers of the first and second bobbins 105 and 107 to be positioned on the same axis are displaced due to this bending, the rotor unit may be tilted, or the bent pier-shaped portion 107a may come into contact with the rotor unit. Doing so may cause malfunction.

  Further, the adhesiveness of the overlapping portion between the inner peripheral portion 105a of the first bobbin 105 and the jetty-shaped portion 107a of the second bobbin 107 is determined by the heat of the molten resin generated by melting the jetty-shaped portion 107a. It can be enhanced by melting 105a. Therefore, in order to increase the thermal conductivity of the molten resin to the inner peripheral portion 105a, the inner peripheral portion 105a and the jetty-shaped portion 107a are usually superimposed on the pressure-welding taste in design.

  However, due to the bending of the pier-shaped portion 107a due to the melting of the pier-shaped portion 107a of the second bobbin 107 by the laser beam, a gap is formed in the overlapping portion, the gap gradually widens, and the molten resin flows out into the gap. There is a risk. The outflow of the molten resin causes a problem that the thermal conductivity of the molten resin to the inner peripheral portion 105a of the first bobbin 105 is lowered. As a result, the melting of the inner peripheral portion 105a hardly progresses and there is a possibility that poor welding occurs. In this case, as shown in FIG. 18, the inner peripheral portion 105a and the pier-shaped portion 107a are welded and held at the shallow melting portion of the pier-shaped portion 107a indicated by the plane and d dimension of the inner peripheral portion 105a. Therefore, it becomes weak against the pulling force in the axial direction.

  Furthermore, as shown in FIG. 19, a structure is assumed in which the jetty-shaped portion 107 a of the second bobbin 107 is supported by the magnetic pole portion 108 a of the second stator 108. In this case, when the pier-shaped portion 107a is irradiated with the laser beam LQ to melt the pier-shaped portion 107a, the melted and expanded resin melts the inner peripheral portion 105a of the first bobbin 105, while To bend and deform. When the molten resin is solidified in such a curved deformation state, the molten resin contracts during solidification, so that a cavity indicated by a point A in FIG. 19 is generated. Due to this cavity, a welding failure in which the welding area is drastically reduced may occur, and the tensile force in the axial direction may be weakened. Such poor welding reduces the productivity of the stepping motor.

  The present invention has been made in view of the above-described conventional problems, and does not cause poor welding without strict dimensional control of parts, and can perform reliable laser welding processing, and productivity. It is an object of the present invention to provide a welding resin body excellent in the above and a driving device using a welding technique related to the welding resin body.

  In order to solve the above-mentioned problem, a welding resin body of the present invention is a welding resin body including a first member made of a laser light transmitting resin and a second member made of a laser light melting resin, The first member and the second member have an overlapping portion that is overlapped with each other, and the overlapping portion is urged in a direction in which they are pressed against each other by a reaction force due to elastic deformation, and the first member side A first overlapping portion formed by welding with a laser beam irradiated toward the second member; and a second overlapping portion in which the first member and the second member are fitted and positioned. It is characterized by having.

A driving device according to the present invention includes a cylindrical magnet rotatably supported, a first bobbin around which a first coil that is made of a laser light transmitting resin and is arranged concentrically with the magnet, A second bobbin made of a laser light transmitting resin and wound by a second coil disposed concentrically with the magnet, and a magnetic pole excited by the first coil so as to face the outer peripheral surface of the magnet A first stator that is coaxially combined with the first bobbin;
A second stator that is provided with a magnetic pole portion that is excited by the second coil so as to face the outer peripheral surface of the magnet, and that is coaxially combined with the second bobbin; and a laser beam meltable resin, A bobbin and an intermediate member for positioning the second bobbin, wherein the first bobbin, the second bobbin, and the intermediate member overlap each other. The overlapping portion is urged in a direction in which they are pressed against each other by a reaction force due to elastic deformation, and is welded by a laser beam irradiated toward the intermediate member from the first bobbin and the second bobbin. And a second overlapping portion in which the first bobbin and the second bobbin, and the intermediate member are fitted and positioned.

  In this drive device, the second overlapping portion is disposed opposite to the position where the magnetic pole portions of the first stator and the second stator are disposed, and the first overlapping portion is the first overlapping portion. It is preferable that the stator and the second stator are disposed between the positions where the magnetic pole portions are disposed. The magnetic pole portions of the first stator and the second stator are preferably positioned so as to have a magnetic phase. Further, each of the first bobbin, the second bobbin, and the intermediate member has an annular cross section in the radial direction, and the first bobbin, the second bobbin, and the intermediate member are fitted to each other. The first bobbin, the second bobbin, the intermediate member, the first stator, and the second bobbin are arranged in order from the radially outer side to the inner side around the rotation axis of the magnet. It is preferable that the stator and the magnet are arranged coaxially in this order.

  In this drive device, at least one of the first bobbin, the second bobbin, and the intermediate member includes a protrusion on the first overlapping portion, and the first bobbin and the intermediate bobbin are elastically deformed by the protrusion. It is preferable that the second bobbin and the intermediate member are in pressure contact with each other. Further, it is preferable that the protrusion is formed on the first bobbin and the second bobbin, and follows the melting of the intermediate member by the laser beam to bite into the molten portion of the intermediate member and be welded. It is preferable that the tip of the protrusion has a curved surface, and it is preferable that an uneven portion is further formed on the curved surface of the protrusion.

  The function of the intermediate member in the driving device can be given to the second bobbin. That is, another drive device according to the present invention includes a cylindrical magnet rotatably supported and a laser light transmitting resin, and a first coil disposed concentrically with the magnet is wound around the first drive device. A first bobbin, a second bobbin made of a laser-melting resin and wound around a second coil disposed concentrically with the magnet, and the first coil facing the outer peripheral surface of the magnet A first stator that is coaxially combined with the first bobbin, and a magnetic pole portion that is excited by the second coil so as to face the outer peripheral surface of the magnet. A second stator that is coaxially combined with the two bobbins, and has a superimposed portion in which the first bobbin and the second bobbin are overlapped, Elasticity A first overlapping portion formed by welding with a laser beam that is urged in a direction in which they are pressed against each other by a reaction force depending on the shape and is irradiated from the first bobbin side toward the second bobbin; The second bobbin and the second bobbin are fitted and positioned, and a second overlapping portion is provided.

  According to the welded resin body according to the present invention, the first member and the second member are reliably positioned without elastic deformation due to the fitting at the second overlapping portion, and the positioning allows the laser The overlapping position of both members of the first overlapping portion serving as the welded portion is also restricted. Further, when the first overlapping portion overlaps due to elastic deformation, a clearance gap does not occur due to the reaction force of elastic deformation. As a result, without using a special pressure welding apparatus, the first overlapping portion is always kept in a pressure welding state stably by a reaction force due to elastic deformation, and laser welding can be performed reliably. In this way, it is possible to provide a welded resin body having excellent productivity without causing poor welding without strictly managing the dimensions of parts.

  According to the driving device of the present invention, the first and second bobbins constituting the driving device are reliably positioned on the same axis and fixed by using the laser welding technique of the welded resin body for the driving device. It becomes possible to do. In this way, it is possible to provide a drive device that does not have poor welding and does not have operational failures such as rotational failures and rotational spots.

  Further, in the driving device according to the present invention, the first overlapping portion where the welding by the laser beam is performed is disposed at a position not facing the magnetic pole portion of the stator, so that the molten portion of the laser beam meltable resin passes through the magnetic pole portion. Therefore, it is possible to suppress the heat dissipation. Thus, the energy of the laser beam can be used efficiently, and a reliable welding process can be performed. Further, a protrusion is formed on at least one of the contact surfaces of the first overlapping portion, the tip thereof is a curved surface, and an uneven portion is further provided on the tip as necessary, so that the protrusion is melted by laser light. It can be welded while biting into the part. Thereby, even when the molten resin is cooled and solidified and contracts, no gap is generated in the welded portion, and the welding can be performed reliably.

1 is an exploded perspective view showing a schematic configuration of a stepping motor according to a first embodiment of the present invention. It is a schematic perspective view which shows the assembly completion state of the stepping motor of FIG. It is sectional drawing which shows the internal structure of the radial direction of the stepping motor of FIG. It is sectional drawing which shows the internal structure of the axial direction of the stepping motor of FIG. It is sectional drawing which expands and shows the structure of the 1st, 2nd overlapping part shown by FIG. It is sectional drawing which shows the ZZ cross section of FIG. It is a principal part enlarged view of the axial direction which shows the welding state of the welding part after the laser welding in FIG. It is a principal part enlarged view of the radial direction which shows the welding state of the welding part after the laser welding in FIG. FIG. 9 is an enlarged view of a main part in the axial direction showing a welded state of a welded part after laser welding in the modified example of the stepping motor according to the first embodiment of the present invention, similarly to FIG. 7. It is a disassembled perspective view which shows schematic structure of the stepping motor which concerns on the 2nd Embodiment of this invention. It is a schematic perspective view which shows the assembly completion state of the stepping motor of FIG. It is sectional drawing which shows the internal structure of the radial direction of the stepping motor of FIG. It is sectional drawing which shows the internal structure of the axial direction of the stepping motor of FIG. It is sectional drawing which expands and shows the structure of the 1st, 2nd overlapping part shown by FIG. It is a principal part enlarged view of the axial direction which shows the welding state of the welding part after the laser welding in FIG. It is a disassembled perspective view which shows schematic structure of the conventional stepping motor. FIG. 17 is a cross-sectional view showing a schematic internal structure in an axial direction of the stepping motor shown in FIG. 16. It is a cross-sectional enlarged view which shows an example of the welding state of the welding part after the laser welding of the stepping motor shown by FIG. It is a cross-sectional enlarged view which shows another example of the welding state of the welding part after the laser welding of the stepping motor shown by FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[First Embodiment]
FIG. 1 is an exploded perspective view showing a schematic configuration of the stepping motor according to the first embodiment of the present invention, and FIG. 2 is a schematic perspective view showing an assembled state of the stepping motor. 3 is a cross-sectional view showing an internal structure in the radial direction of the stepping motor of FIG. 2, and FIG. 4 is a cross-sectional view showing an internal structure of the stepping motor in FIG. 2 in the axial direction. FIG. 5 is an enlarged cross-sectional view showing the structure of the first and second overlapping portions shown in FIG. 4, and FIG. 6 is an enlarged cross-sectional view showing the ZZ cross section of FIG.

  As shown in FIGS. 1 and 2, the stepping motor includes a rotor unit RO, a first stator unit ST1, a second stator unit ST2, a first stator unit ST1, and a second stator unit ST2. It is comprised from the intermediate member 10 which connects. The rotor unit RO includes a magnet 1, a core 2, and a rotating shaft 3. The first stator unit ST1 includes a first bearing 4, a first bobbin 5, and a first stator 6. The second stator unit ST <b> 2 includes a second bearing 7, a second bobbin 8, and a second stator 9.

  The first bobbin 5 and the second bobbin 8 correspond to a first member defined in claims 1 and 2. The intermediate member 10 corresponds to a second member defined in claims 1 and 2. Therefore, the 1st bobbin 5, the 2nd bobbin 8, and the intermediate member 10 comprise the welding resin body.

  First, the rotor unit RO will be described.

  The magnet 1 has a cylindrical shape, and its outer peripheral surface is divided into n parts in the circumferential direction (in this embodiment, n = 10), and as shown in FIG. 3, the S pole and the N pole And a magnetized portion magnetized alternately. The core 2 is made of a soft magnetic material such as electromagnetic soft iron, and the magnet 1 is fixed to the outer periphery thereof. The rotating shaft 3 is press-fitted into the center hole of the core 2 and is rotatably supported by the first bearing 4.

  Next, the first stator unit ST1 will be described.

  The first bearing 4 is made of a soft magnetic material, and supports the rotary shaft 3 constituting the rotor unit RO so as to be smoothly rotatable. The 1st bearing 4 is comprised from the cylindrical part 4a and the collar part 4b.

  The first bobbin 5 is made of a resin that can transmit laser light. For example, the first bobbin 5 is made of a laser light transmitting resin that has heat resistance such as a liquid crystal polymer and is milky white and has laser light transmission. It is injection molded. The radial cross section of the first bobbin 5 is annular. A first coil 5 f disposed concentrically with the magnet 1 is wound around the first bobbin 5. The laser light transmitting resin here means a resin that has a high laser light transmittance when irradiated with laser light and does not melt directly by the energy of the laser light.

  The first bobbin 5 includes a pier-shaped portion 5a, a plurality of holes 5c (five in the present embodiment), and a fitting hole 5d. The jetty-shaped portion 5a constitutes the intermediate member 10 and a first overlapping portion (described in detail later). When the first stator 6 is combined with the first bobbin 5, a plurality of magnetic pole portions 6a (described later) of the first stator 6 pass through the respective hole portions 5c. The fitting hole 5d is formed in the shaft center part so as to be fitted to the cylindrical part 4a of the first bearing 4.

  The hole 5c is arranged so as to be at a position different from the jetty-shaped portion 5a in the circumferential direction when the first stator unit ST1 and the second stator unit ST2 are assembled coaxially via the intermediate member 10, respectively. Is done. That is, the jetty-shaped portion 5a serving as a laser welded portion (to be described in detail later) and the magnetic pole portion 6a of the first stator 6 are arranged at positions that do not face each other, and the laser welded portion is irradiated with laser light. It is difficult for the heat of fusion to diverge through the magnetic pole part 6a.

  On the inner peripheral surface of the jetty-shaped portion 5a, a protrusion 5e is provided at a portion where the laser welded portion (first overlapping portion) is formed so as to overlap with the outer peripheral wall 10a of the intermediate member 10. The pier-shaped portion 5a is elastically deformed by the engagement between the protrusion 5e and the outer peripheral wall 10a, and is urged in the direction in which they are pressed against each other by the reaction force due to the elastic deformation, so that the pressure contact state is always maintained.

  The tip of the protrusion 5e, that is, the contact surface of the protrusion 5e with the outer peripheral wall 10a is a curved surface. Thereby, as will be described later, when the outer peripheral wall 10a is irradiated with the laser beam LQ to melt the outer peripheral wall 10a, the protrusion 5e can be bitten into the melted portion S (see FIG. 7) without any gaps. Good welding can be performed.

  In the first bobbin 5, a fitting wall 5b is provided at a position different from the laser welded portion (first overlapping portion). The fitting wall 5b is fitted with the outer peripheral wall 10b of the intermediate member 10 without being elastically deformed with a gap of a fitting tolerance, and is positioned on the same position as the second bobbin 8 (second position). (Overlapping part).

  By the positioning by the fitting wall 5b, the overlapping position of the jetty-shaped portion 5a constituting the first overlapping portion that is the laser welding portion and the outer peripheral wall 10a of the intermediate member 10 is regulated. Further, when the jetty-shaped portion 5a is elastically deformed and overlaps the outer peripheral wall 10a, a clearance gap is not generated in the positioning portion due to the reaction force of the elastic deformation. Thus, the pressure contact state between the first bobbin 5 and the intermediate member 10 is always stably maintained by the reaction force due to the elastic deformation of the jetty-shaped portion 5a.

  The first stator 6 is made of a soft magnetic material and is disposed so as to face the outer peripheral surface of the magnet 1. The first stator 6 includes a plurality (five in the present embodiment) of magnetic pole portions 6a extending in the axial direction from the main body. The magnetic pole portion 6a is formed with a predetermined pitch (72 degrees in the present embodiment) and a predetermined width.

  With the magnetic pole portion 6a of the first stator 6 inserted into the hole portion 5c of the first bobbin 5, the cylindrical portion 4a of the first bearing 4 is passed through the fitting hole 5d of the first bobbin 5. It press-fits into the center hole 6b of the 1st stator 6, and the front-end | tip protrusion part of the cylindrical part 4a is adjusted. The first bobbin 5 and the first stator 6 are integrally sandwiched between the flange portion 4b of the first bearing 4 and the tip protruding portion by this tightening and tightening. That is, the 1st bearing 4, the 1st bobbin 5, and the 1st stator 6 are fixed integrally, and are integrated in a stepper motor as 1st stator unit ST1. Thus, the first bearing 4 and the first stator 6 are magnetically connected. In addition, the first bearing 4 is fitted to the rotary shaft 3 at the inner diameter portion thereof, so that the rotary shaft 3 is rotatably held, so that the first bearing 4 and the rotary shaft 3 are Are magnetically connected.

  With the above configuration, the first stator 6 and the rotary shaft 3 are magnetically connected via the first bearing 4, and the magnetic flux generated by the first coil 5f flows. As a result, the magnetic poles of the first stator 6 The part 6a is selectively excited to the N pole or the S pole depending on the direction of the current supplied to the first coil 5f by a control circuit (not shown).

  Next, the second stator unit ST2 will be described.

  The second stator unit ST2 has substantially the same structure as the first stator unit ST1. However, as described later, when the first stator unit ST1 and the second stator unit ST2 are coaxially assembled, the hole 5c of the first bobbin 5 and the hole 8c of the second bobbin 8 The positions at which are opposite are different. This is because the magnetic pole part 6a of the first stator 6 and the magnetic pole part 9a (described later) of the second stator 9 are arranged with a predetermined magnetic phase.

  The second bearing 7 is made of a soft magnetic material, and supports the rotary shaft 3 constituting the rotor unit RO so as to be smoothly rotatable. The 2nd bearing 7 is comprised from the cylindrical part 7a and the collar part 7b.

  The second bobbin 8 is made of a resin that can transmit laser light. For example, a laser light transmitting resin that has heat resistance such as a liquid crystal polymer and is milky white and has laser light transmittance is injected. Molded. The radial cross section of the second bobbin 8 is annular. A second coil 8 f disposed concentrically with the magnet 1 is wound around the second bobbin 8.

  The second bobbin 8 includes a jetty-shaped portion 8a, a plurality (five in the present embodiment) of holes 8c, and a fitting hole 8d. The pier-shaped portion 8a constitutes the intermediate member 10 and the first overlapping portion. When the second stator 9 is combined with the second bobbin 8, the plurality of magnetic pole portions 9a of the second stator 9 pass through the respective hole portions 8c. 8 d of fitting holes are formed in the axial center part so that the cylindrical part 7a of the 2nd bearing 7 may be fitted.

  The hole 8c of the second bobbin 8 is different from the jetty-shaped portion 8a in the circumferential direction when the first stator unit ST1 and the second stator unit ST2 are assembled coaxially via the intermediate member 10, respectively. It is arranged so as to be in position. That is, the pier-shaped portion 8a serving as the laser welded portion and the magnetic pole portion 9a of the second stator 9 are arranged at positions that do not face each other, and the heat of fusion when the laser beam is irradiated to the laser welded portion generates the magnetic pole portion 9a. It is difficult to diverge through.

  On the inner peripheral surface of the pier-shaped portion 8a of the second bobbin 8, a protrusion 8e is formed on the laser welding portion (first overlapping portion) overlapping the outer peripheral wall 10a of the intermediate member 10. The pier-shaped portion 8a is elastically deformed by the engagement between the projection 8e and the outer peripheral wall 10a of the intermediate member 10, and the pressure contact state is constantly maintained by being biased in the direction in which they are pressed against each other by the reaction force due to the elastic deformation. Is done.

  In the second bobbin 8, a fitting wall 8b is provided at a position different from the laser welded portion (first overlapping portion). The fitting wall 8b is fitted to the outer peripheral wall 10b of the intermediate member 10 without being elastically deformed with a gap of a fitting tolerance, and is positioned on the same axis as the first bobbin 5 (second position). (Overlapping part).

  By the positioning by the fitting wall 8b, the overlapping position between the jetty-shaped portion 8a of the second bobbin 8 and the outer peripheral wall 10a of the intermediate member 10 constituting the first overlapping portion that becomes the laser welding portion is regulated. Further, when the jetty-shaped portion 8a is elastically deformed and overlaps the outer peripheral wall 10a, a clearance gap is prevented from being generated in the positioning portion by the reaction force of the elastic deformation. In this way, the pressure contact state between the second bobbin 8 and the intermediate member 10 is always maintained stably by the reaction force due to the elastic deformation of the jetty-shaped portion 8a.

  The second stator 9 is made of a soft magnetic material and is disposed so as to face the outer peripheral surface of the magnet 1. The second stator 9 includes a plurality of (five in the present embodiment) magnetic pole portions 9a extending in the axial direction from the main body. The magnetic pole portions 9a are formed with a predetermined pitch (72 degrees in the present embodiment) and a predetermined width.

  With the magnetic pole portion 9a of the second stator 9 inserted into the hole 8c of the second bobbin 8, the cylindrical portion 7a of the second bearing 7 is passed through the fitting hole 8d of the second bobbin 8. It press-fits into the center hole 9b of the 2nd stator 9, and the front-end | tip protrusion part of the cylindrical part 7a is adjusted. By this tightening and tightening, the second bobbin 8 and the second stator 9 are sandwiched integrally between the flange portion 7b of the second bearing 7 and the tip protruding portion. That is, the second bearing 7, the second bobbin 8, and the second stator 9 are integrally fixed, and are incorporated into the stepping motor as the second stator unit ST2. Thus, the second bearing 7 and the second stator 9 are magnetically connected. Moreover, the 2nd bearing 7 hold | maintains the rotating shaft 3 rotatably by fitting with the rotating shaft 3 in the internal diameter part, and the 2nd bearing 7 and the rotating shaft 3 are in the fitting part. Magnetically connected.

  With the above configuration, the second stator 9 and the rotary shaft 3 are magnetically connected via the second bearing 7, and the magnetic flux generated by the second coil 8f flows. As a result, the magnetic poles of the second stator 9 Depending on the direction of the current supplied to the second coil 8f by the control circuit (not shown), the portion 9a is selectively selected to have an N or S pole that is always different from the pole on which the magnetic pole portion 6a of the first stator 6 is excited. Excited.

  Next, the intermediate member 10 will be described.

  The intermediate member 10 has a ring shape, and is formed by injection molding a laser beam meltable resin to which laser beam absorption is imparted by mixing black carbon or the like into a heat resistant material such as a liquid crystal polymer. It is. The radial cross section of the intermediate member 10 is annular.

  On the inner peripheral surface of the intermediate member 10, positioning portions 10 d (five places in the present embodiment) for inserting and positioning the magnetic pole portions 6 a of the first stator 6, and the magnetic pole portions 9 a of the second stator 9. A positioning portion 10c for inserting and positioning is formed. These positioning portions 10d and 10c are used for phase determination for determining the phase position where the magnetic pole portions 6a and 9a are arranged to mesh with each other at a predetermined interval.

  Next, the arrangement of various members constituting the stepping motor will be described.

  As described above, when the stepping motor is assembled, the first bobbin 5 and the first stator 6 are coupled by the first bearing 4 in a predetermined positional relationship in the radial direction and the axial direction. The second bobbin 8 and the second stator 9 are coupled to each other in a predetermined positional relationship in the radial direction and the axial direction by the second bearing 7.

  The overlapping portion where each of the first bobbin 5 and the second bobbin 8 after the stepping motor assembly is overlapped with the intermediate member 10 is roughly divided into a first overlapping portion and a second overlapping portion.

  As shown in FIG. 5, the first overlapping portion includes an overlapping portion between the jetty-shaped portion 5 a of the first bobbin 5 and the outer peripheral wall 10 a of the intermediate member 10, and the jetty-shaped portion 8 a of the second bobbin 8. And the outer peripheral wall 10a of the intermediate member 10 are overlapping portions. The first overlapping portion is biased in a direction in which it is pressed against each other by a reaction force caused by elastic deformation of the jetty-shaped portion 5a and the jetty-shaped portion 8a, and is fixed by welding.

  The second overlapping portion includes the overlapping portion of the fitting wall 5b of the first bobbin 5 and the outer peripheral wall 10b of the intermediate member 10, and the fitting wall 8b of the second bobbin 8 and the outer peripheral wall 10b of the intermediate member 10. This is the overlapping part. In the second overlapping portion, the fitting walls 5b and 8b and the outer peripheral wall 10b are fitted and positioned without being elastically deformed by a gap due to fitting tolerance.

  As described above, in this embodiment, the protrusion 5e is formed on the jetty-shaped portion 5a of the first bobbin 5, and the protrusion 8e is formed on the jetty-shaped portion 8a of the second bobbin 8, respectively. In the portion, these protrusions 5 e and 8 e are in pressure contact with the outer peripheral wall 10 a of the intermediate member 10. By the protrusions 5e and 8e, the jetty-shaped portions 5a and 8a are elastically deformed as shown in FIG. 5 and the pressure contact state is maintained.

  As shown in FIG. 3, the pier-shaped portion 5a of the first bobbin 5 and the pier-shaped portion 8a of the second bobbin 8 are arranged in order from the radially outer side to the inner side around the rotation shaft 3 of the rotor unit RO. The intermediate member 10, the magnetic pole part 6a of the first stator 6, the magnetic pole part 9a of the second stator 9, and the magnet 1 are arranged. A magnetic stator is configured by covering a part of the magnet 1 with the magnetic pole portions 6a and 9a. Further, the magnetic pole portions 6a and 9a are respectively arranged at positions not facing the jetty-shaped portions 5a and 8a, and at the time of laser welding described later, the heat of fusion due to the laser light LQ diverges through the magnetic pole portions 6a and 9a. It has a difficult structure.

  Next, the assembly process of the stepping motor will be described.

  First, after the magnet 1 and the core 2 are integrated, the rotary shaft 3 is press-fitted into the center hole of the core 2, and the rotor unit RO is formed by the magnet 1, the core 2, and the rotary shaft 3.

  Next, the magnetic pole part 6a of the first stator 6 is passed through the hole part 5c of the first bobbin 5, the cylindrical part 4a of the first bearing 4 is passed through the center hole 5d of the first bobbin 5, and the first After one bobbin 5 is fixed by the flange portion 4 b of the first bearing 4, the cylindrical portion 4 a of the first bearing 4 is press-fitted into the center hole 6 b of the first stator 6. At this time, the first bearing unit 4 fixes the first bobbin 5 and the first stator 6 in a predetermined positional relationship between the radial direction and the axial direction, thereby forming the first stator unit ST1.

  Similarly, the magnetic pole portion 9a of the second stator 9 is passed through the hole 8c of the second bobbin 8, the cylindrical portion 7a of the second bearing 7 is passed through the center hole 8d of the second bobbin 8, and the second After the second bobbin 8 is fixed by the flange portion 7 b of the second bearing 7, the cylindrical portion 7 a of the second bearing 7 is press-fitted into the center hole 9 b of the second stator 9. At this time, the second bobbin 8 and the second stator 9 are fixed by the second bearing 7 in a predetermined positional relationship between the radial direction and the axial direction, thereby forming the second stator unit ST2.

  Using each unit built in the above steps, first, the rotating shaft 3 of the rotor unit RO is moved from the front and back in the axial direction to the inner diameter of the first bearing 4 of the first stator unit ST1 and the second. Is fitted to the inner diameter of the second bearing 7 of the stator unit ST2. Subsequently, the pier-shaped portion 5a of the first bobbin 5 and the pier-shaped portion 8a of the second bobbin 8 are fitted to the outer peripheral wall 10a of the intermediate member 10, respectively, and the fitting wall 5b of the first bobbin 5 and the second The fitting walls 8b of the two bobbins 8 are respectively fitted to the outer peripheral wall 10b. Thus, the temporary assembly of the stepping motor is completed.

  In this temporarily assembled state, as shown in FIG. 5, a cylindrical intermediate member 10 in which the fitting wall 5b of the first bobbin 5 and the fitting wall 8b of the second bobbin 8 are hard and hardly elastically deformed. And the second overlapped portion is configured by fitting with an interval of fitting tolerance. As a result, the first bobbin 5 and the second bobbin 8 are accurately positioned coaxially by the second overlapping portion.

  The first bearing 4 constituting the first stator unit ST1, the first bobbin 5, and the magnetic pole portion 6a of the first stator 6, the second bearing 7 constituting the second stator unit ST2, and the second The bobbin 8 and the magnetic pole portion 9a of the second stator 9 are coaxially positioned with respect to the rotating shaft 3 of the rotor unit RO. Therefore, the rotor unit RO can be rotated without eccentricity, and can be smoothly rotated (driven) without any rotation spots.

  On the other hand, the base end portions of the pier-shaped portion 5a of the first bobbin 5 and the pier-shaped portion 8a of the second bobbin 8 are firmly positioned with respect to the outer peripheral wall 10a of the intermediate member 10 by the second overlapping portion. It becomes a state. In this state, the first overlapping portion, that is, the overlapping portion of the protrusion 5e provided on the pier-shaped portion 5a and the outer peripheral wall 10a, and the overlapping of the protrusion 8e provided on the pier-shaped portion 8a and the outer peripheral wall 10a. Each part is in the state shown in FIGS. 5 and 6.

  That is, the jetty-shaped portions 5a and 8a are both elastically deformed so that the protrusions 5e and 8e are in contact with the outer peripheral wall 10a so as to be pushed outward with respect to the outer peripheral wall 10a. As a result, the jetty-shaped portions 5a and 8a are maintained in the pressure contact state with the outer peripheral wall 10a by the reaction force F due to elastic deformation, and can always be maintained in the pressure contact state without using a pressure welding jig or the like.

  Next, the laser welding process of the stepping motor will be described.

  First, a stepping motor in a temporarily assembled state is set on a predetermined jig. Next, the protrusion 5e provided on the pier-shaped portion 5a of the first bobbin 5 and the protrusion 8e provided on the pier-shaped portion 8a of the second bobbin 8 overlap with the outer peripheral wall 10a of the intermediate member 10, respectively. The laser beam LQ is irradiated to the portion (first overlapping portion). As shown by arrows in FIGS. 2 and 3, the laser light LQ is irradiated by a predetermined amount from the direction orthogonal to the axial direction on the outer peripheral side of the stepping motor using a laser irradiation device.

  The laser beam LQ is transmitted through the jetty-shaped portion 5a of the first bobbin 5 and the jetty-shaped portion 8a of the second bobbin 8 made of a laser beam-transmissive resin, and the outer periphery of the intermediate member 10 made of a laser beam-melting resin. The surface portion of the wall 10a is irradiated. As a result, the surface portions of the outer peripheral wall 10a where the projections 5e and 8e provided on the jetty-shaped portions 5a and 8a are in pressure contact with each other absorb the energy of the laser beam LQ and melt. The protrusions 5e and 8e are melted by the propagation of the heat of fusion. Due to this melting, both melted portions are fused and welded together.

  Subsequently, as shown in FIG. 3, the stepping motor is rotated by a predetermined angle (72 degrees in the present embodiment), and the irradiation position of the laser light LQ is changed between the jetty-shaped portion 5 a of the first bobbin 5 and the second shape. The bobbin 8 is set at the next phase position of the jetty-shaped portion 8a and welded by irradiating with a laser LQ. This operation is further repeated twice, and welding is performed by irradiating the laser beam LQ to the eight pier-shaped portions 5a and 8a in four times. Thus, the stepping motor is completed.

  7 is an enlarged view of the main part in the axial direction showing the welded state of the welded part after laser welding in FIG. 5, and FIG. 8 is an enlarged view of the main part in the radial direction showing the welded state of the welded part after laser welding in FIG. FIG. 7 and 8, the laser beam LQ is emitted in the longitudinal direction of the protrusions 5e and 8e provided on the pier-shaped portions 5a and 8a of the first and second bobbins 5 and 8, respectively (see FIG. 1). ) Shows a state of irradiation and welding while being moved along.

  The surface portion of the outer peripheral wall 10a of the intermediate member 10 irradiated with the laser light LQ absorbs heat and starts to melt. The protrusions 5e and 8e are pushed into the melted portion S of the outer peripheral wall 10a by an elastic reaction force and bite. The molten resin pushed out by the protrusions 5e and 8e is attached to the protruding surfaces of the protrusions 5e and 8e. In this state, when the irradiation with the laser beam LQ is completed, the molten resin starts to solidify while contracting, and the protrusions 5e and 8e bite into the molten portion S of the outer peripheral wall 10a by elastic reaction force according to the contraction of the molten resin.

  In this way, the pressure contact state between the jetty-shaped portions 5a, 8a and the outer peripheral wall 10a is maintained while the protrusions 5e, 8e bite into the molten portion S of the outer peripheral wall 10a, so that the conventional two-plane flat surface is simply overlapped. Compared with laser welding, a wide welding area without gaps can be secured. In this way, the welding force between the jetty-shaped portions 5a and 8a and the outer peripheral wall 10a can be significantly increased.

  In this embodiment, a method of rotating a stepping motor, which is a workpiece, is used when performing welding by laser beam LQ irradiation. However, the present invention is not limited to this. For example, a method may be used in which a plurality of laser beam irradiation units are installed in advance and the workpiece is irradiated with the laser beams LQ from the plurality of laser beam irradiation units without rotating the stepping motor that is the workpiece.

  In the present embodiment, the position where the laser beam LQ is irradiated, that is, the range where the first overlapping portion is located, as shown in FIG. It arrange | positions so that the magnetic pole part 9a of the stator 9 may not confront. This is to make it difficult for the heat of fusion of the laser beam LQ to escape and to reliably melt the outer peripheral wall 10a of the intermediate member 10. However, when the irradiation capability of the laser beam LQ is sufficiently high, the laser beam LQ does not hit the rotor unit RO by arranging the magnetic pole portions 6a and 9a so as to face each other inside the jetty-shaped portions 5a and 8a. It is also possible to protect.

  Further, in the present embodiment, the protrusions 5e and 8e provided on the pier-shaped portions 5a and 8a of the first and second bobbins 5 and 8, respectively, are formed in an elongated shape as shown in FIGS. However, the present invention is not limited to this. Further, in the present embodiment, the protrusions 5e and 8e are provided on the pier-shaped portions 5a and 8a, respectively. However, instead of such a configuration, protrusions are formed on the intermediate member 10 and the pier-shaped portions 5a and 8a and You may superimpose.

  FIG. 9 is an enlarged view of the main part in the axial direction showing the welded state of the welded part after laser welding in the modified example of the stepping motor described above, similarly to FIG. For example, in order to obtain a required welding strength, as shown in FIG. 9, the unevenness portions 5g and 8g can be formed on the protruding surfaces of the protrusions 5e and 8e to enlarge the welding area. The shapes of the concavo-convex portions 5g and 8g are not limited to those shown in FIG. 9, and can be appropriately modified.

[Second Embodiment]
FIG. 10 is an exploded perspective view showing a schematic configuration of a stepping motor according to the second embodiment of the present invention, and FIG. 11 is a schematic perspective view showing an assembled state of the stepping motor. 12 is a cross-sectional view showing the radial internal structure of the stepping motor of FIG. 11, and FIG. 13 is a cross-sectional view showing the axial internal structure of the stepping motor of FIG. 14 is an enlarged sectional view showing the structure of the first and second overlapping portions shown in FIG. 13, and FIG. 15 is an axial view showing the welding state of the welded portion after laser welding in FIG. It is a principal part enlarged view.

  In the second embodiment, the same components as those in the first embodiment described above are denoted by the same reference numerals, and the description thereof is omitted as having the same functions. Here, the first component described above is omitted. Only differences from the embodiment will be described.

  The first difference is the structure of the second bobbin 11 provided in the second stator unit ST1 constituting the stepping motor according to the second embodiment. That is, in the stepping motor according to the second embodiment, the second bobbin 11 has both the functions of the second bobbin 8 and the intermediate member 10 used in the stepping motor according to the first embodiment. Therefore, as shown in FIG. 10, the second bobbin 11 has a shape in which the second bobbin 8 and the intermediate member 10 are integrally molded. The second bobbin 11 corresponds to a second member defined in claims 1 and 2.

  In order for the second bobbin 11 to have the function of the intermediate member 10, the second bobbin 11 can absorb laser light by mixing black carbon or the like into a heat-resistant material such as a liquid crystal polymer. Is produced by injection molding a laser beam meltable resin to which is added.

  On the inner peripheral surface of the second bobbin 11, there are positioning portions 11g (in this embodiment, five locations) for inserting and positioning the magnetic pole portions 6a of the first stator 6, and the magnetic pole portions 9a of the second stator 9. A positioning part 11h for insertion and positioning is formed. The positioning portions 11g and 11h are used to determine a phase position where the magnetic pole portion 6a and the magnetic pole portion 9a are arranged to mesh with each other at a predetermined interval. Incidentally, one of the positioning portions 11g and 11h is a rotation stopper to which the magnetic pole portions 6a and 9a are fitted.

  The outer peripheral wall 11a of the second bobbin 11 includes a first outer peripheral wall portion 11i and a second outer peripheral wall portion 11j. The first outer peripheral wall portion 11 i corresponds to the outer peripheral wall 10 a of the intermediate member 10, and the second outer peripheral wall portion 11 j corresponds to the outer peripheral wall 10 b of the intermediate member 10.

  The pier-shaped portion 5a of the first bobbin 5 and the first outer peripheral wall portion 11i of the second bobbin 11 are urged in a direction in which they are pressed against each other by a reaction force due to elastic deformation to form a first overlapping portion, This first overlapping portion is fixed by welding. Further, the fitting wall 5b and the second outer peripheral wall portion 11j are fitted together without being elastically deformed by a gap due to the fitting tolerance, and a second overlapping portion for positioning is formed.

  The first overlapping portion is irradiated with a predetermined amount of laser light LQ from the first bobbin 5 side toward the second bobbin 11 by the laser irradiation device. The laser light LQ that has passed through the first bobbin 5 made of laser light transmissive resin generates heat and melts the first outer peripheral wall portion 11i that is the irradiation surface of the second bobbin 11 made of laser light meltable resin. Due to the propagation of the heat of fusion, the protrusion 5e provided on the jetty-shaped portion 5a also generates heat and melts. In this way, both melting parts are fused, and the first bobbin 5 and the second bobbin 11 are welded.

  In the stepping motor according to the second embodiment, the cylindrical fitting wall 5b included in the first bobbin 5 and the cylindrical second outer peripheral wall portion 11j included in the second bobbin 11 are both rigid. Hard to elastically deform. Therefore, by fitting the fitting wall 5b and the second outer peripheral wall portion 11j to each other and fitting them with a tolerance interval to form a second overlapping portion, as shown in FIG. The first bobbin 5 and the second bobbin 11 are accurately positioned on the same axis.

  That is, the first bearing 4 constituting the first stator unit ST1, the first bobbin 5, the magnetic pole portion 6a of the first stator 6, the second bearing 7 constituting the second stator unit ST2, the second The bobbin 11 and the magnetic pole portion 9a of the second stator 9 are all positioned coaxially with respect to the rotating shaft 3 of the rotor unit RO. Therefore, the rotor unit RO can rotate without eccentricity, has no rotation spots, and can rotate smoothly.

  The base end portion of the jetty-shaped portion 5a of the first bobbin 5 is a first outer periphery of the second bobbin 11 by a second overlapping portion formed by the fitting wall 5b and the second outer peripheral wall portion 11j. It will be in the state positioned firmly with respect to the wall part 11i. FIG. 14 shows the form of the first overlapping portion formed by the protrusion 5e provided on the jetty-shaped portion 5a and the first outer peripheral wall portion 11i in this state. That is, the jetty-shaped portion 5a is elastically deformed as shown in FIG. 14 by the projection 5e being pushed outward by the first outer peripheral wall portion 11i with respect to the first outer peripheral wall portion 11i.

  As a result, the pier-shaped portion 5a is maintained in the pressure contact state with the first outer peripheral wall portion 11i by the reaction force F due to its elastic deformation. That is, the first overlapping portion that can always maintain the pressure contact state is formed without using a pressure welding jig or the like. As in the stepping motor according to the first embodiment, the fixing area is increased by, for example, forming an uneven portion 5g (see FIG. 9) on the protruding surface of the protrusion 5e, and the necessary welding strength is ensured. You may do it.

  As shown in FIG. 15, the irradiation surface of the laser light LQ on the first outer peripheral wall portion 11 i of the second bobbin 11 starts to melt by absorbing the energy of the laser light LQ. The protrusion 5e provided on the jetty-shaped portion 5a of the first bobbin 5 is pushed in by the elastic reaction force and bites into the melted portion, so that the extruded molten resin adheres to the protruding surface of the protrusion 5e. In this state, when the melting by the laser beam LQ is terminated, the molten resin starts to solidify while contracting, and the protrusion 5e follows the contraction by the elastic reaction force, so that the pressure contact state with respect to the first outer peripheral wall portion 11i is achieved. Maintained.

  That is, the protrusion 5e bites into the molten portion S of the first outer peripheral wall portion 11i, and the protruding surface of the protrusion 5e and the molten resin of the first outer peripheral wall portion 11i are welded without any gap, so that two planes are simply overlapped. Compared to the conventional laser welding, a wide welding area without a gap can be secured. Thus, the welding force between the jetty-shaped portion 5a and the first outer peripheral wall portion 11i can be significantly increased.

[Other Embodiments]
In the first embodiment and the second embodiment described above, the number (the number of teeth) of the magnetic pole portions 6a of the first stator 6 and the magnetic pole portions 9a of the second stator 9 is five. However, it is also possible to increase the number of teeth as necessary.

  Further, by forming the magnetic pole part 6a of the first stator 6 and the magnetic pole part 9a of the second stator 9 into a semicircular arc composed of one pole tooth, it can be used as an actuator that reciprocates within a range of 180 degrees. it can.

  The drive devices such as stepping motors and actuators have been described above, but the present invention can be widely applied to devices that constitute a structure that welds two resin members by a laser resin welding method.

DESCRIPTION OF SYMBOLS 1 Magnet 2 Core 3 Rotating shaft 4 1st bearing 5 1st bobbin (1st member)
5a Pier-shaped portion 5e Protrusion 6 First stator 7 Second bearing 8 Second bobbin (first member)
8a Pier-shaped portion 8e Protrusion 9 Second stator 10 Intermediate member (second member)
10a Outer peripheral wall 11 Second bobbin (second member)
11i 1st outer peripheral wall part RO rotor unit ST1 1st stator unit ST2 2nd stator unit

Claims (10)

A welded resin body comprising a first member made of a laser beam transmissive resin and a second member made of a laser beam meltable resin,
The first member and the second member have an overlapping portion where they are overlapped with each other,
The overlapping portion is
A first overlapping portion formed by welding with a laser beam that is urged in a direction in which they are pressed against each other by a reaction force due to elastic deformation and is irradiated from the first member side toward the second member;
A welded resin body comprising: a second overlapping portion where the first member and the second member are fitted and positioned. A cylindrical magnet that is rotatably supported;
A first bobbin formed of a laser light transmitting resin and wound with a first coil disposed concentrically with the magnet;
A second bobbin made of a laser light transmitting resin and wound with a second coil disposed concentrically with the magnet;
A first stator which is provided with a magnetic pole portion which is excited by the first coil so as to face an outer peripheral surface of the magnet, and is coaxially combined with the first bobbin;
A second stator that is provided with a magnetic pole portion that is excited by the second coil so as to face the outer peripheral surface of the magnet, and is coaxially combined with the second bobbin;
An intermediate member for positioning the first bobbin and the second bobbin, which is made of a laser beam meltable resin,
The first bobbin and the second bobbin, and the intermediate member have an overlapped portion,
The overlapping portion is
A first overlapping portion that is urged in a direction in which they are pressed against each other by a reaction force due to elastic deformation, and is welded by laser light emitted from the first bobbin and second bobbin sides toward the intermediate member When,
A driving device comprising: a second overlapping portion in which the first bobbin and the second bobbin and the intermediate member are fitted and positioned. The second overlapping portion is disposed opposite to the position where the magnetic pole portions of the first stator and the second stator are disposed,
3. The driving device according to claim 2, wherein the first overlapping portion is disposed between positions where the magnetic pole portions of the first stator and the second stator are disposed.   4. The driving apparatus according to claim 3, wherein the magnetic pole portions of the first stator and the second stator are positioned so as to have a magnetic phase. The first bobbin, the second bobbin, and the intermediate member each have an annular cross section in the radial direction, and the first bobbin, the second bobbin, and the intermediate member are fitted to each other. Has a shape to
The first bobbin and the second bobbin, the intermediate member, the first stator and the second stator, and the magnet in order from the radially outer side to the inner side around the rotation axis of the magnet. The drive device according to any one of claims 2 to 4, wherein the drive devices are arranged coaxially in this order. At least one of the first bobbin, the second bobbin, and the intermediate member includes a protrusion on the first overlapping portion,
3. The drive device according to claim 2, wherein the first bobbin, the second bobbin, and the intermediate member are in pressure contact with each other due to elastic deformation by the protrusion.   The protrusions are formed on the first bobbin and the second bobbin, and follow the melting of the intermediate member by laser light to bite into the molten portion of the intermediate member and be welded. The drive device according to claim 6.   The driving device according to claim 6 or 7, wherein a tip of the protrusion is a curved surface.   The driving device according to claim 8, wherein a concave and convex portion is further formed on the curved surface of the protrusion. A cylindrical magnet that is rotatably supported;
A first bobbin formed of a laser light transmitting resin and wound with a first coil disposed concentrically with the magnet;
A second bobbin made of a laser melting resin and wound with a second coil disposed concentrically with the magnet;
A first stator which is provided with a magnetic pole portion which is excited by the first coil so as to face an outer peripheral surface of the magnet, and is coaxially combined with the first bobbin;
A driving device comprising: a second stator that includes a magnetic pole portion that is excited by the second coil facing the outer peripheral surface of the magnet and is coaxially combined with the second bobbin;
An overlapping portion in which the first bobbin and the second bobbin are overlapped;
The overlapping portion is
A first overlapping portion formed by welding with a laser beam that is urged in a direction in which they are pressed against each other by a reaction force due to elastic deformation and is irradiated from the first bobbin side toward the second bobbin;
A driving device comprising: a second overlapping portion where the first bobbin and the second bobbin are fitted and positioned.