JP2005028331A - Vibration generator and electronic appliance - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To perform miniaturization and thinning relating to a vibration generator and an electronic appliance provided with the vibration generator. <P>SOLUTION: The vibration generator comprises a bottom plate 47 to which a planar coil 120 is attached, a fixed shaft 91 provided vertically on the bottom plate 47, a magnet 85 attached to the fixed shaft 91 through a freely rotatable bearing and oppositely arranged with a slight clearance from the surface of the planar coil 120, a weight 87 attached to the magnet 85, and a lid member 45 attached to the bottom plate so as to cover the fixed shaft 91, the magnet 85 and the weight 87. Then, the vibration generator generates vibrations by rotating the magnet 85 and the weight 87 by energizing a coil provided in the planar coil 120. In the vibration generator 40, an extension part 271 is constituted by extending a part of the planar coil 120 or a supporting substrate supporting the coil 120 from the edge of the lid member 45 and the extension part 271 is provided with an electrode D1. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a vibration generator that generates vibration by rotating a rotor, and an electronic apparatus having the vibration generator.

  Taking a mobile phone as an example of an electronic device, the mobile phone has a structure that can notify a user of an incoming call by generating vibration in a so-called manner mode. Such a cellular phone incorporates a vibration generator as a vibration actuator that generates vibration. As this type of vibration generator, there is a small vibration motor having a vibration generating eccentric weight (see, for example, Patent Document 1).

  In recent years, electronic devices using such vibration motors have been increasingly reduced in size and thickness, and further reductions in thickness and thickness have been demanded for vibration motors incorporated in a housing.

Japanese Patent No. 3187029

  However, in the conventional small vibration motor, a terminal for supplying power, that is, a conduction terminal made of a leaf spring or a coil spring, is provided on the back side of the bottom plate, and this conduction terminal prevents the overall thickness of the vibration motor from being reduced. It has become.

  The present invention has been made to solve such problems. That is, the vibration generator of the present invention is attached via a bottom plate to which a flat coil substrate is attached, a fixed shaft suspended from the bottom plate, and a bearing that is rotatable with respect to the fixed shaft. It has a magnet that is placed opposite to the surface of the substrate with a slight gap, an unbalancer that is attached to the magnet, and a lid that is attached to the bottom plate so as to cover the fixed shaft, the magnet, and the unbalancer. This is a device that generates vibration by rotating a magnet and an unbalancer by energizing a coil provided on a flat coil substrate. In such a vibration generator, a part of a flat coil substrate or a support substrate that supports the coil substrate is extended from the edge of the lid member, and an electrode is provided on the extended portion. .

  Further, in the configuration of the vibration generator, the present invention is such that an electrode is provided on a flat coil substrate, and a terminal connected to the electrode is extended from the inside of the lid member to the outside.

  Thus, by extending a part of the coil substrate or the support substrate from the lid member and providing the electrode in the extended portion, the terminals attached to the electrode can be arranged side by side on the lid member. Further, by providing electrodes on the flat coil substrate and extending the terminals connected to the electrodes from the inside of the lid member to the outside, most of the terminals can be accommodated in the lid member. As a result, the influence of the terminal on the height of the entire apparatus can be reduced.

  In the present invention, since the influence of the conduction terminal for flowing current through the coil on the height of the entire apparatus can be reduced, it is possible to reduce the thickness of the vibration generator. As a result, it is possible to reduce the size of the electronic device incorporating the vibration generator.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, since embodiment described below is a suitable example of this invention, the scope of the present invention is not limited to these embodiments.

  1 and 2 show an example of a mobile phone as an example of an electronic apparatus having the vibration generator of the present invention. That is, the mobile phone 10 is a digital mobile phone having a frequency range of 0.8 to 1.5 (GHz), for example, and as shown in FIGS. 1 and 2, the housing 12, the antenna 14, and the display unit 16. , An operation unit 18, a microphone 20, a speaker 22 and the like.

  As shown in FIG. 1, the operation unit 18 includes various operation keys, and includes a call button 18A, a call disconnect button 18B, a numeric keypad 18C, and the like. For example, a liquid crystal display device can be used as the display unit 16.

  The housing 12 has a front part 24 shown in FIG. 1 and a rear part 26 shown in FIG. 2, and a battery 28 can be detachably fixed to the rear part 26 side. The antenna 14 is attached to the housing 12 so that it can be taken in and out.

  A vibration generator 40 is built in the housing 12 of FIG. The vibration generating device 40 has a function of generating vibration when receiving an incoming call in the mobile phone 10, for example, and notifying the user of the incoming call by vibration.

  FIG. 3 is a perspective view illustrating a specific structure of the vibration generator. This vibration generator 40 is also called a vibration actuator, and includes a case 43 and a vibration motor 50 disposed in the case 43.

  FIG. 4 is an exploded perspective view of the case of the vibration generator, and the vibration motor 50 is not shown in FIG. The case 43 has a lid member 45, a bottom plate 47, and a magnetic thin plate 48.

  The lid member 45 of the case 43 is a member made of iron, magnetic stainless steel, silicon steel plate or the like as an example of a magnetically permeable material such as metal, and closes the magnetic path.

  The bottom plate 47 is made of aluminum or stainless steel made of a nonmagnetic material, and is a substantially square plate member. At the four corners of the bottom plate 47, caulking portions 49 are provided. A hole 51 is formed in the center of the bottom plate 47.

  Further, a plurality of holes 400 are provided at equal intervals around the holes 51 of the bottom plate 47. Since the bottom plate 47 is made of a non-magnetic material, an attractive force due to the magnetic force of the magnet 85 is not generated between the magnet 85 of the rotor 80 and the bottom plate 47, and the rotational force of the rotor 80 or the like is hindered by the attractive force. It will not be done.

  The magnetic thin plate 48 is made of, for example, a magnetically permeable material such as a metal such as iron, magnetic stainless steel or silicon steel plate. Since the magnetic thin plate 48 is attached to the opposite side of the rotor 85 with respect to the magnet 85 (outside the bottom plate 47) with the bottom plate 47 interposed therebetween, the magnet 85 is attracted by the attractive force between the magnetic thin plate 48 and the magnet 85. Is attracted to the bottom plate 47 side to prevent the rotor 80 from being lifted by rotation.

  The lid member 45 of FIG. 4 has a flat portion 53 and four corner portions 55 that are almost circular. Cutouts 57 are formed in the four corner portions 55 respectively. The notch 57 is fitted with a caulking portion 49 at a corresponding position of the bottom plate 47, and the caulking portion 49 is mechanically caulked, so that the lid member 45 and the bottom plate 47 as shown in FIG. The vibration motor 50 is assembled in an integrated manner in a state in which it is accommodated.

  The magnetic thin plate 48 is bonded to the bottom plate 47 with an adhesive or the like. The magnetic thin plate 48 may be attached in a detachable state. As a result, it can be easily replaced with another size or shape as required.

  The vibration motor 50 shown in FIG. 3 is provided with a conical coil-shaped electrical connection terminal 270 in an extending portion 271 extending outward from the lid member 45, and the electrical connection terminal 270 is used to electrically connect to a main circuit board. It is connected to the.

  FIG. 5 is a partially broken plan view showing an example of the shape of the vibration generating device, and shows a state in which the lid member 45 shown in FIG. 4 is removed. FIG. 6 is a cross-sectional view illustrating the attached state.

  As shown in FIG. 4, the lid member 45 is made of a material capable of forming a magnetic circuit such as iron or stainless steel. As shown in FIG. 5, the vibration motor 50 and, for example, a plurality of electronic components 71, 72, 73 and 74 are accommodated in the space between the bottom plate 47 and the lid member 45.

  The lid member 45 is attached to the bottom plate 47 by caulking as shown in FIGS. 3 and 4 to accommodate the vibration motor 50 therein. The vibration motor 50 includes a rotor 80 and a stator 83.

  In the vibration motor 50 of the vibration generator 40, the stator 83 supports the rotor 80 in a rotatable manner. When the rotor 80 is rotated by energizing the flat coil 120 of the stator 83 from the main circuit board 99 of FIG. 3, the rotor 80 of the vibration motor 50 of the vibration generator 40 generates vibration. It is like that.

  First, the structure of the rotor 80 of the vibration motor 50 will be described. The rotor 80 is continuously rotatable with respect to the stator 83 about the central axis CL. As shown in FIG. 6, the rotor 80 includes a bearing 150, a sleeve 151, a magnet 85, a weight 87 for generating vibration, and a rotor yoke 89.

  The bearing 150 is a cylindrical member, and the bearing 150 is made of, for example, sintered metal or resin. When this resin is employed, for example, PPS (polyphenylene sulfide; the same shall apply hereinafter) can be employed.

  A sleeve 151 is fixed to the outer peripheral surface of the bearing 150 by, for example, press-fitting. The sleeve 151 is also called a bearing housing, and is made of a metal such as brass, aluminum, stainless steel, or a resin (for example, PPS). In the example shown in FIG. 6, the bearing 150 and the sleeve 151 are separate members, but the bearing 150 and the sleeve 151 may be formed as a single body. As a result, it is possible to reduce the number of parts and assembly man-hours.

  The driving magnet 85 shown in FIG. 6 is arranged with respect to the outer peripheral surface of the sleeve 151. The magnet 85 is a donut-shaped or ring-shaped magnet, and uses, for example, a neody-based or sapling-based sintered material. The magnet 85 is fixed to the inner surface of the rotor yoke 89 using, for example, an adhesive. The magnet 85 shown in FIG. 6 is obtained by alternately magnetizing S-poles and N-poles along the circumferential direction.

  The rotor yoke 89 is made of a magnetically permeable material such as iron or stainless steel. The rotor yoke 89 is fixed to the outer peripheral surface of the sleeve 151 (or the bearing 150 when the sleeve 151 and the bearing 150 are integrated) by press-fitting or bonding, ultrasonic welding, caulking, or all of them.

  When performing ultrasonic welding, an ultrasonic wave is generated by providing a triangular pyramid-shaped protrusion (not shown) on the end surface of the sleeve 151 (or the bearing 150 when the sleeve 151 and the bearing 150 are integrated). It is possible to perform welding by efficiently applying ultrasonic waves from the horn to be applied through the protrusions. The diameter of the rotor yoke 89 is substantially the same as the diameter of the magnet 85.

  Weights 87 are provided on the outer peripheral surfaces of the rotor yoke 89 and the magnet 85 in FIG. The weight 87 has a semicircular shape as shown in FIG. 7. For example, as shown in FIG. 5, the weight 87 is fixed to the rotor yoke 89 and the weight by caulking, bonding, or other fixing methods. Yes.

  The weight 87 is an unbalancer for extracting rotational unbalance energy as a vibration component by continuously rotating the rotor 80 shown in FIG. 5 around the center axis CL of the shaft 91 with respect to the stator 83. The weight 87 is made of a material having a large specific gravity such as tungsten.

  The rotor 80 shown in FIG. 6 is disposed in the space between the lid member 45 and the bottom plate 47. As a result, the magnet 85 and the flat coil 120 are arranged to face each other with a slight gap therebetween.

  Next, the structure of the stator 83 shown in FIG. 6 will be described. The stator 83 includes a bottom plate 47, a magnetic thin plate 48, a flat coil 120, a fixed shaft 91, an extending portion 271, and an electrical connection terminal 270.

  The extended portion 270 is a part of the substrate that forms the flat coil 120, and the extended portion 270 is provided with an electrode D1 for energizing the coil. The electrical connection terminal 270 is, for example, a terminal having a conical coil-like spring property, and is electrically connected to the electrode D1 provided on the extending portion 271 by, for example, soldering, and the circuit board 99 side becomes free and the electrode D2 Can be contacted with. The electrical connection terminal 270 can be made of an elastically deformable conductive metal such as Au or Cu.

  The fixed shaft 91 in FIG. 6 is a fixed shaft that is suspended from the lid member 45 and the bottom plate 47 by welding, for example. The center of the fixed shaft 91 is the central axis CL. One end of the fixed shaft 91 is fixed to the inner surface 45H of the lid member 45 by a welded portion 45G. Similarly, the other end portion of the fixed shaft 91 is fixed to the inner peripheral surface 47H of the hole portion of the bottom plate 47 by a welded portion 47G.

  The fixed shaft 91 is made of, for example, stainless steel, and the length along the central axis CL is set to be considerably short. The end surfaces of the one end and the other end of the fixed shaft 91 are not flat surfaces but convex curved surfaces.

  As a result, one end and the other end of the fixed shaft 91 can be securely welded and fixed to the lid member 45 and the bottom plate 47 by the welded portions 45G and 47G. One or both of the end surfaces of the fixed shaft 91 may be a flat surface as necessary.

  The fixed shaft 91 is inserted into the bearing 150 of the rotor 80 and is supported so as to be rotatable in the radial direction with respect to the bearing 150.

  Next, the structure of the flat coil 120 of the stator 83 will be described. 6 has a plurality of drive patterns 121 as shown in the exploded perspective view of FIG. These drive patterns 121 are arranged along the circumferential direction around the hole 120H around the central axis CL.

  FIG. 9 is a plan view showing a shape example of the drive pattern of the flat coil 120. Each of the drive patterns 121 has a substantially fan shape. For example, six drive patterns 121 are formed in the circumferential direction. The flat coil 120 is fixed to the inner surface 47M of the bottom plate 47 shown in FIG.

  The plurality of electronic components 71 to 74 are directly attached and fixed to the flat coil 120 with an adhesive, and each electronic component 71 to 74 is electrically connected to a necessary portion through the flat coil 120. It is connected to the. The flat coil 120 is configured by stacking a plurality of thin flexible wiring boards.

  For example, a part of the uppermost layer of the plurality of flexible wiring boards is provided as an extending portion 271, and an electrical connection terminal 270 is attached thereto via an electrode.

  Note that the flat coil 120 is not limited to this, and may be configured by a single-layer wiring board, or may be configured by stacking two, three, or five or more wiring boards.

  The flat coil 120 described above is formed by laminating a plurality of wiring boards as described above to form multiple layers (for example, four layers), thereby increasing the torque constant when rotating the rotor 80 and vibrating. The generator 40 can be reduced in thickness and size. Each drive pattern 121 is connected to U-layer, V-layer, and W-layer extraction electrodes, and the extraction electrodes are electrically connected to the main circuit board 99 via electrical connection terminals 270.

  Each driving pattern 121 of the flat coil 120 shown in FIG. 5 can continuously rotate the rotor 80 with respect to the stator 83 by three-phase full-wave driving by, for example, energization of the sensorless type three-phase full-wave method. .

  In any case, since the flat coil 120 and the flat bottom plate 47 are pasted and fixed, the vibration generator 40 can realize a reduction in thickness in the central axis CL direction and a reduction in size in the diameter direction. .

  The magnetic thin plate 48 attached to the outside of the bottom plate 47 is a thin plate made of a magnetic material with respect to the bottom plate 47 made of a non-magnetic material as described above, and the magnet 85 of the rotor 80 that does not occur in the bottom plate 47. Is generated by the magnetic thin plate 48 to prevent the rotor 80 and the like from being lifted by rotation.

  In other words, since the bottom plate 47 is made of a non-magnetic material, the bottom plate 47 does not generate the attractive force of the magnet 85, thereby the rotor 80 is not attracted to the bottom plate 47 side, and the contact friction between the bearing 150 and the bottom plate 47. Even if the rotor 80 is reduced in size and weight due to the reduction, a sufficient rotational torque can be obtained.

  On the other hand, since no attractive force is generated between the bottom plate 47 and the magnet 85, the rotor 80 is lifted by the rotation of the rotor 80 as it is, and the rotor yoke 89 and the bearing 150 come into contact with the lid member 45, The gap with the flat coil 120 changes, which causes a problem that the rotation of the rotor 80 is prevented.

  Therefore, by attaching the magnetic thin plate 48 to the bottom plate 47, the magnet 85 is attracted to the bottom plate 47 side to prevent the rotor 8 from being lifted by rotation.

  Further, since the attractive force of the magnet 85 can be adjusted according to the area of the magnetic thin plate 48, the attractive force that prevents the rotor 80 from being lifted due to rotation and prevents the rotor 80 from being lifted excessively can be set freely and easily. become able to.

  The determination of the area of the magnetic thin plate 48 is obtained in advance from the required attraction force according to the design specifications of the vibration generator 40. However, when manufacturing variation occurs, the area of the magnetic thin plate 48 to be attached is finely adjusted. It is possible to ensure the specified rotation of the rotor 80 and prevent the rotor 80 from being lifted, and to greatly improve the product yield.

  Further, since the attractive force of the rotor 80 can be adjusted by changing the magnetic thin plate 48 to be attached without changing the bottom plate 47, the structural strength is not impaired.

  The electronic components 71 to 74 shown in FIG. 5 are, for example, as follows. That is, the electronic component 71 is a driver IC (integrated circuit), the electronic component 72 is a resistance element, and the electronic component 73 and the electronic component 74 are capacitors. Although these electronic components 71 to 74 are externally attached components, they can be directly mounted on the flat coil 120.

  These electronic components 71 to 74 can be mounted together on the flexible wiring board 123 by reflow or the like. Moreover, these electronic components 71-74 are things like a bare chip, for example, and are about 2 mm square size as an example.

  The heights of these electronic components 71 to 74 in the direction of the central axis CL are such that they do not hit the weight 87 of the rotor 80 shown in FIG. That is, the weight 87 and the electronic component can be overlapped when viewed in the plane of FIG. 5, thereby reducing the vertical and horizontal width dimensions of the vibration generator 40 as seen in FIG. 5. Can do.

  The vibration generator 40 is electrically connected to the main circuit board 99 via the electrical connection terminal 270. The electrical connection terminal 270 is an elastically deformable terminal. The electrical connection terminal 270 extends from the extended portion 271 toward the main circuit board 99 and is electrically connected so as to be pressed against the electrode D <b> 2 of the circuit board 99. The main circuit board 99 may be a hard board having a relatively large thickness, such as a glass epoxy board or the like.

  The electrical connection terminal 270 of the vibration generator 40 can electrically connect the drive patterns 121 of the flat coil 120 and the electronic components 71 to 74 to the main circuit board 99.

  As shown in FIG. 5, a hole 400 is formed substantially at the center of each drive pattern 121. This hole 400 is also shown in FIGS. Each hole 400 is formed in the center portion of the drive pattern 121, but the hole 400 is also formed at the position of the corresponding bottom plate 47. Each hole 400 is formed at a position unrelated to the driving force generation portion of the driving pattern 121.

  As the electrical connection terminal 270 for electrical connection with the circuit board 99 as in the present embodiment, the extended portion 271 extending from the board of the flat coil 120 is provided to extend toward the circuit board 99 via the electrode D1. As a result, the influence of the height of the electrical connection terminal 270 on the entire vibration generator can be reduced, and the vibration generator can be thinned.

  FIG. 10 is a schematic diagram for explaining the arrangement of the electrical connection terminals. In the example shown in FIG. 10A, the extended portion 271 extends from substantially the center of the side surface of the lid member 45, so that the two extended portions 271 and the electrical connection terminals 270 are provided on the opposite side surfaces. In the example shown in FIG. 10B, the extended portion 271 extends from the end of the side surface of the lid member 45, and the two extended portions 271 and the electrical connection terminal 270 are located at the target positions on the opposite side surfaces. Is provided. Further, in the example shown in FIG. 10C, two extending portions 270 and electrical connection terminals 270 are provided on two opposing side surfaces of the lid member, respectively, and a total of four electrical connection terminals 270 are provided. Yes.

  In any example, the extending portion 270 and the electrical connection terminal 270 may be disposed in relation to the wiring layout of the circuit board that is connected to the electrical connection terminal 270. The numbers of the extending portions 270 and the electrical connection terminals 270 are not limited to the above example.

  FIG. 11 is a schematic diagram illustrating the orientation of the electrical connection terminals. FIG. 11A shows an example in which the electrical connection terminal 270 is soldered to the electrode D1 provided on the extending portion 271 of the flat coil 120, and the circuit board 99 side is free. On the other hand, FIG. 11B shows an example in which only the electrode D1 is formed on the extending portion 271 of the flat coil 120, and the electrical connection terminal 270 is soldered to the circuit board 99 side. As described above, it is possible to cope with the case where the electrical connection terminal 270 is attached to either the flat coil 120 or the circuit board 99.

  FIG. 12 is a cross-sectional view illustrating another example (part 1) of the vibration generator according to the present embodiment. In this vibration generator 40, the configuration of the vibration motor 50 is the same as that of the embodiment described in FIG. 6, but only the support substrate 121 of the flat coil 120 extends from the inside of the lid member 45 to the outside. An extending portion 271 is provided here.

  An electrode D1 for energizing the flat coil 120 is formed on the extended portion 271, and a conical coil-shaped electrical connection terminal 270 is connected to the electrode D1 by soldering. The electrical connection terminal 270 extends to the circuit board 99 side, and the end on the circuit board 99 side is free to come into contact with the electrode D2 of the circuit board 99.

  FIG. 13 is a cross-sectional view illustrating another example (No. 2) of the vibration generator according to the present embodiment. In the vibration generating device 40, only the support substrate 121 extends from the inside of the lid member 45 to the outside of the configuration described in FIG. 12, the configuration of the vibration motor 50, and the flat coil 120. The configuration in which 271 is provided is the same, but is different in that only the electrode D1 is formed in the extended portion 271.

  In this example, as shown in FIG. 11B, the conical coil-shaped electrical connection terminal 270 is connected to the electrode d2 of the circuit board 99 by soldering, and the free end is the electrode D1. Is in contact with the

  In any example, since the electrical connection terminal 270 is arranged at a position aligned with the lid member 40 of the vibration generator 40, the influence of the height of the electrical connection terminal 270 on the overall thickness of the vibration generator 40 can be reduced. In addition, the vibration generator 40 can be thinned.

  FIG. 14 is a cross-sectional view for explaining another example (part 3) of the vibration generator according to the present embodiment. In the vibration generating device 40, only the support substrate 121 extends from the inside of the lid member 45 to the outside of the configuration described in FIG. 12, the configuration of the vibration motor 50, and the flat coil 120. The configuration in which 271 is provided is the same, but is different in that a plate spring-like electrical connection terminal 270 is connected to the electrode D1 of the extended portion 271.

  In any of the above examples, a conical coil-shaped one is used as the electrical connection terminal 270, but a leaf spring-shaped one is used here. There are two leaf spring-like electrical connection terminals 270, which are provided in parallel. FIG. 15 is a schematic diagram for explaining an arrangement example of leaf spring-like electrical connection terminals. As the leaf spring-like electrical connection terminals 270, even if they are arranged side by side in one extending portion 270 as described above, they are respectively extended from the opposite sides of the lid member 45 as shown in FIG. You may make it provide in each.

  Further, the positional relationship between the fixed end 270a and the free end 270b of the two electrical connection terminals 270 may be arranged so as to face in opposite directions as shown in FIGS. 15 (a) and (b-2). As shown in FIG. 15 (b-1), they may be arranged so as to face the same direction.

  As shown in FIG. 14, when two electrical connection terminals 270 are arranged in parallel in one extending portion 270, each fixed end 270a and each of the fixed ends 270a and 270a as shown in FIG. Desirably, the free ends 270b are arranged in opposite directions. Thereby, since it is not necessary to adjoin the two electrodes D2 of the circuit board 99 that are in contact with the free ends 270b of the electrical connection terminals 270, it is possible to increase the size and the degree of freedom of arrangement of the electrodes D2.

  Moreover, as shown in FIG.15 (c), the extending part 271 may be provided so that it may extend from the edge | side which the cover member 45 adjoins, and you may make it arrange | position the leaf-spring-like electrical connection terminal 270 in each. Further, although not shown, three or four extending portions are provided corresponding to each side of the lid member 45, and three or four electric connecting terminals 270 are provided by disposing the electric connecting terminals 270 respectively. It may be.

  In addition, even the leaf spring-like electrical connection terminal 270 is connected to the circuit board 99 side by soldering instead of the vibration generator side, similarly to the conical coil-like electrical connection terminal 270 described above, It is good also as a structure which provides only the electrode D1 in the extension part 271 of a vibration generator.

  FIG. 16 is a cross-sectional view illustrating another embodiment. In this vibration generator 40, the configuration of the vibration motor 50 is the same as that of the embodiment described in FIG. 6, but does not interfere with the rotation of the rotor 80 inside the lid member 45, such as the even part of the flat coil 120. The electrical connection terminal 270 having a conical coil shape is provided at the position, and the feature is that the tip of the electrical connection terminal 270 extends to the outside from the hole provided in the lid member 45.

  The conical coil-shaped electrical connection terminal 270 is connected to the electrode D <b> 1 provided on the flat-plate coil 120 by soldering, and is disposed so as to rise toward the hole of the lid member 45. At this time, an insulating sleeve 272 is provided so that the conical coil-shaped electrical connection terminal 270 does not fall and come into contact with the periphery of the lid member 45, the rotor 80, etc., and the conical coil-shaped electrical connection is provided inside the sleeve 272. A terminal 270 is disposed.

  Since the sleeve 270 and the conical coil-shaped electrical connection terminal 270 are arranged using an even dead space that does not interfere with the rotation of the rotor 80 among the substantially rectangular flat plate-shaped coil 120 substrates, An increase in the size (occupied space) of the vibration generator 40 due to the attachment of the terminal 270 can be suppressed.

  Since FIG. 16 is a cross-sectional view, only one set of the sleeve 272 and the electrical connection terminal 270 is shown, but by arranging it in two or more even portions of the flat coil 120 as necessary, Power can be supplied from the circuit board 99 to the flat coil 120.

  As described above, in the vibration generator 40 of this embodiment, the vibration motor 50 is accommodated in the case 43 shown in FIG. This vibration motor 50 employs a so-called face-to-face structure in which the magnet 85 of the rotor 80 and the plate-like coil 120 of the stator 83 are slightly spaced from each other. As a result, the vibration generator 40 including the vibration motor 50 can significantly reduce the thickness in the direction of the central axis CL compared to a conventional brushed motor.

  The weight 87 is made of a material having a high specific gravity such as tungsten. However, the vibration motor 50 has a large rotational imbalance when rotating the rotor 80 only by using a very thin and small weight 87. A vibration component due to energy can be generated.

  Further, since the lid member 45 of the case 43 shown in FIG. 3 is formed in a diaphragm shape, it is possible to reduce the weight and the thickness while increasing the rigidity.

  Furthermore, by using the thin magnet 85 using the sintered material and the thin plate-like coil 120 of the flexible printed wiring board, the vibration generator 40 can be reduced in size and thickness in the direction of the central axis CL. Not only can it reduce power consumption.

  The flat coil 120 is preferably formed by laminating a plurality of wiring boards. Each of the plurality of wiring boards is called a laminate coil. Each laminate coil is one in which a coil copper wire is disposed inside, for example, polycarbonate which is an insulating material.

  The flat coil 120 is directly attached and fixed to the flat bottom plate 47 with an adhesive or the like. However, the present invention is not limited to this, and the flat coil 120 may be fixed to the bottom plate 47 by caulking or pinching that is mechanically fixed.

  In addition, some electronic components can be electrically connected to the surface layer electrode of the flat coil 120 by, for example, wire bonding.

  In the present embodiment, the fixed shaft 91 on the stator 83 side can be fixed to the lid member 45 and the bottom plate 47 by welding, for example, with a YAG laser. However, the fixing method of the fixing shaft 91 is not limited to welding, and may of course be adhesion, press-fitting, or caulking. In this case, both ends of the fixed shaft 91 may be spherical, but a flat surface is more preferable as described above.

  Moreover, the bearing 150 of the rotor 80 can be comprised, for example with PPS containing carbon fiber. Of course, the cylindrical bearing is not limited to plastic but may be sintered metal.

  Further, in the present embodiment, the bearing 150 of the rotor 80 is rotatable with respect to the fixed shaft 91 on the stator 83 side, so that the conventional rotor side shaft is rotatably supported with respect to the stator side bearing. Compared to the above, there is no squeezing motion of the rotor, and no shaft runout occurs when the rotor rotates.

  That is, wear between the bearing 150 of the rotor and the sliding portion of the fixed shaft 91 of the stator 83 is reduced, and the life of the vibration generator 40 is extended. Further, since the bearing 150 on the rotor 80 side is rotatably supported with respect to the fixed shaft 91 on the stator 83 side, the rotor of the vibration generating device 40 can be obtained even if the axial length of the vibration generating device 40 is reduced. The shaft runout when the 80 rotates can be made as small as possible. Thereby, the vibration generator 40 can be reduced in thickness and size. Note that the shaft runout of the rotor 80 is further eliminated as the axial length of the bearing 150 approaches the length of the fixed shaft 91.

  Examples of the electronic device having the vibration generating device 40 according to the present embodiment are not limited to the mobile phone 10 and can be applied to other types of mobile communication devices such as a portable information terminal, a computer, or other devices. It is.

It is a front view explaining a mobile telephone (electronic device) which has a vibration generator concerning this embodiment. It is a rear view explaining a mobile telephone (electronic device) which has a vibration generator concerning this embodiment. It is a perspective view explaining the structure of a vibration generator. It is a disassembled perspective view of the case of a vibration generator. It is a partially broken top view which shows the example of a shape of a vibration generator. It is sectional drawing explaining the attachment state of a vibration generator. It is a figure which shows the weight for vibration generation. It is a disassembled perspective view which shows a rotor and a stator. It is a top view of the flat coil of a stator side. It is a schematic diagram explaining arrangement | positioning of an electrical connection terminal. It is a schematic diagram explaining the direction of an electrical connection terminal. It is sectional drawing explaining the other example (the 1) of the vibration generator which concerns on this embodiment. It is sectional drawing explaining the other example (the 2) of the vibration generator which concerns on this embodiment. It is sectional drawing explaining the other example (the 3) of the vibration generator which concerns on this embodiment. It is a schematic diagram explaining the example of arrangement | positioning of a leaf | plate spring-shaped electrical connection terminal. It is sectional drawing explaining other embodiment of a vibration generator.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Mobile phone, 40 ... Vibration generator, 43 ... Case, 45 ... Case lid member, 47 ... Bottom plate, 48 ... Magnetic thin plate, 50 ... Vibration motor, 71, 72, 73, 74 ... Electronic component, 80 ... Rotor, 83 ... Stator, 85 ... Magnet, 87 ... Weight, 89 ... Rotor yoke, 91 ... Fixed shaft, 120 ... Flat coil, 270 ... Electrical connection terminal, 271 ... Extension part

Claims (7)

A bottom plate to which a flat coil substrate is attached;
A fixed shaft suspended from the bottom plate;
A magnet that is attached via a bearing that is rotatable with respect to the fixed shaft, and that is opposed to the surface of the flat coil substrate with a slight gap;
An unbalancer attached to the magnet;
A cover member attached to the bottom plate so as to cover the fixed shaft, the magnet, and the unbalancer;
In a vibration generator that generates vibration by rotating the magnet and the unbalancer by energizing a coil provided on the flat coil substrate,
A part of the flat coil substrate or a support substrate that supports the coil substrate extends from an edge of the lid member, and an electrode is provided in the extending portion. apparatus. The vibration generator according to claim 1, wherein a coil spring is attached to the electrode. The vibration generator according to claim 1, wherein a leaf spring is attached to the electrode. A bottom plate to which a flat coil substrate is attached;
A fixed shaft suspended from the bottom plate;
A magnet that is attached via a bearing that is rotatable with respect to the fixed shaft, and that is opposed to the surface of the flat coil substrate with a slight gap;
An unbalancer attached to the magnet;
A cover member attached to the bottom plate so as to cover the fixed shaft, the magnet, and the unbalancer;
In a vibration generator that generates vibration by rotating the magnet and the unbalancer by energizing a coil provided on the flat coil substrate,
An electrode is provided on the flat coil substrate, and a terminal connected to the electrode extends outward from the inside of the lid member. The vibration generating device according to claim 4, wherein a sleeve that prevents the terminal from falling is provided around the terminal. In an electronic device equipped with a vibration generator,
The vibration generator is
A bottom plate to which a flat coil substrate is attached;
A fixed shaft suspended from the bottom plate;
A magnet that is attached via a bearing that is rotatable with respect to the fixed shaft, and that is opposed to the surface of the flat coil substrate with a slight gap;
An unbalancer attached to the magnet;
A cover member attached to the bottom plate so as to cover the fixed shaft, the magnet, and the unbalancer;
A part of the flat coil substrate or a support substrate that supports the coil substrate extends from an edge of the lid member, and an electrode is provided in the extending portion. . In an electronic device equipped with a vibration generator,
The vibration generator is
A bottom plate to which a flat coil substrate is attached;
A fixed shaft suspended from the bottom plate;
A magnet that is attached via a bearing that is rotatable with respect to the fixed shaft, and that is opposed to the surface of the flat coil substrate with a slight gap;
An unbalancer attached to the magnet;
A cover member attached to the bottom plate so as to cover the fixed shaft, the magnet, and the unbalancer;
An electronic device, wherein an electrode is provided on the flat coil substrate, and a terminal connected to the electrode extends from the inside of the lid member to the outside.

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