JP2005198482A - Bar-type vibrating motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bar-type vibrating motor that can be reduced in size, by improving the structure of supporting the rotating shaft, the structure of the joint between a fixed body and the rotating shaft, and the structure of contact between a commutator and a brush. <P>SOLUTION: The bar-type vibrating motor comprises a stator portion, a rotor portion, and a power supply portion. The stator portion is provided with a body 12 and magnets 14 fixed on the body 12. The rotor portion comprises a rotating shaft 32, with an eccentric weight 37 fixed at one end and the fixed body 38 fixed at the other end, whose portion adjacent to the eccentric weight 37 is rotatably supported in the body 12; a commutator 34 comprising a plurality of segments fixed on one side face of the fixed body 38; and an armature 36 fixed on the fixed body 38 disposed at a distance from the magnets 14, and electrically connected with the commutator 34. The power supply portion comprises a fixed cap 52 fixed to the body 12, and a brush 54 that is attached to the fixed cap 52 and supplies the armature 36 with a current. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a vibration motor that generates vibration by rotating an eccentric weight, and in particular, downsizing by improving a support structure of a rotating shaft, a coupling structure of a fixed body and a rotating shaft, and a contact structure of a commutator and a brush. The present invention relates to a bar type vibration motor that can be used.

  A mobile phone, which is a typical portable mobile communication terminal currently in use, is equipped with an incoming signal generator to transmit various types of incoming signals to the user. The incoming signal generation device generates sound, illumination, vibration, etc. at the time of incoming of a message or incoming call to notify the user of whether or not the incoming call is received.

  As the incoming signal generator as described above, a sound generator that generates a bell sound or a melody, an illumination device that uses a lamp, a vibration generator that generates vibration, and the like are generally used.

  Among these, the vibration generator uses various types of vibration motors as vibration sources, and such vibration motors are classified into flat type and bar type depending on the form. being classified. Of these, the flat type vibration motor is also called a coin-type vibration motor because it is formed in a shape having a thickness smaller than the diameter. The bar type vibration motor is also called a cylinder type vibration motor because it is formed in a cylindrical shape having a length longer than the diameter.

  Such flat type vibration motors and bar type vibration motors all use electromagnetic induction regardless of their shapes. This electromagnetic induction phenomenon is a phenomenon in which an electromagnetic force is generated in a direction perpendicular to a magnetic field when a conductor is placed in the magnetic field in a direction perpendicular to the magnetic field and a current is passed therethrough. A vibration motor is a device that converts electrical energy into mechanical energy using such an electromagnetic induction phenomenon and generates vibration by the mechanical energy.

  FIG. 1 is a cross-sectional view of a conventional bar type vibration motor, and FIG. 2 is a perspective view of a body of the bar type vibration motor of FIG. The structure will be described below.

  As shown in FIG. 1, the bar type vibration motor 100 includes a stator part 110, a rotor part 130, and a power supply part 150. The stator part 110 includes a body 112 and a magnet 114.

  At this time, as shown in FIGS. 1 and 2, a support tube 112 a is integrally formed inside the body 112, whereby the body 112 has a double tube structure. That is, one end of the body 112 is connected to the support tube 112a, and the other end is open. On the other hand, a bearing seating groove 112b is formed at the front end of the support tube 112a connected to one end of the body 112, and a magnet 114 is fixed to the outer surface of the support tube 112a. The magnet 114 is disposed in the body 112.

  Next, the rotor unit 130 will be described.

  The rotor unit 130 includes an eccentric weight 131, a rotating shaft 132, a commutator 134, an electric element 136, and the like. An eccentric weight 131 is fixed to one end of the rotating shaft 132, and a fixed body 138 is fixed to the other end.

  A commutator 134 composed of a plurality of divided segments is attached to one side surface of the fixed body 138. At this time, a cylindrical convex portion 138 a is formed on one side surface of the fixed body 138. Therefore, the commutator 134 is attached while being divided on one side surface of the fixed body 138 so as to surround the periphery of the convex portion 138a.

  As described above, the electric element 136 is fixed around the fixed body 138 fixed to the other end of the rotating shaft 132, and the electric element 136 is electrically connected to the commutator 134. The electric element 136 can generally have a structure including a winding coil (not shown) around which a coil (not shown) is wound.

  On the other hand, both ends of the rotating shaft 132 are inserted into the support tube 112a and rotated by the first bearing 102 seated in the bearing seating groove 112b and the second bearing 104 inserted in the rear end of the support tube 112a. Supported as possible.

  Next, the power supply unit 150 will be described.

  The power supply unit 150 includes a fixed cap 152 and a pair of brushes 154 provided on the fixed cap 152. The fixing cap 152 is coupled to the other end of the body 112. At this time, the commutator 134 attached around the convex portion 138a of the fixing body 138 and the brush 154 come into contact with each other.

  Power is applied to the brush 154 from the outside through a lead wire (not shown) connected to the brush 154. As described above, when power is applied to the brush 154, current is supplied to the electric element 136 through the commutator 134 that is in contact with the brush 154.

  Therefore, an electromagnetic induction phenomenon due to interaction occurs between the electric element 136 and the magnet 114 fixed to the outer surface of the support tube 112a, and the electric element 136 receives a rotational force. When the rotating shaft 132 is rotated by the rotational force generated as described above, the eccentric weight 131 fixed to one end of the rotating shaft 132 is rotated to generate vibration.

  However, the conventional bar type vibration motor 100 configured as described above has the following problems.

  That is, when an impact force is applied to the mobile phone to which the bar type vibration motor 100 is attached (for example, when the mobile phone is dropped), the impact force is applied to the first bearing 102 and the second bearing 104 through the rotary shaft 132. Is transmitted.

  At this time, of the first bearing 102 that supports the rotating shaft 132 and the second bearing 104, an impact force applied to the second bearing 104 is applied to the first bearing 102 that is positioned adjacent to the eccentric weight 131. There are many problems that a larger impact force is applied and the inner diameter of the first bearing 102 is deformed.

  Further, even when the rotation shaft 132 rotates due to the electromagnetic induction phenomenon and vibration is generated, the first bearing 102 wears more rapidly than the second bearing 104, and uneven wear occurs.

  This is because the impact load due to the eccentric weight 131 acts greatly on the first bearing 102. The above-mentioned uneven wear of the bearing not only generates unnecessary noise when the rotating shaft 132 rotates, The deformation causes a problem of shortening the life of the bar type vibration motor 100.

  Here, in order to solve the above problems, it has been proposed to increase the length of the first bearing 102 to which a large load is applied.

  That is, the depth of the bearing seating groove 112b formed at one end of the body 112 is increased, and a bearing having a longer length or a plurality of bearings are inserted into the bearing 112. It reduces uneven wear.

  However, if the depth of the bearing seating groove 112b is increased in order to increase the length of the bearing provided as described above, the space in the body 112 decreases, and the length of the magnet 114 must be decreased. In other words, the magnetic field formation region is reduced, causing a problem that the performance of the vibration motor is lowered.

  Therefore, in order not to reduce the magnetic field forming region, the size of the vibration motor must be increased, which is difficult to apply to current vibration generators that are becoming smaller.

  Furthermore, the structure of the body 112 as described above does not secure a space between the eccentric weight 131 and one end of the body 112, and when the bar type vibration motor 100 is mounted on a mobile phone or the like, additional fixing parts and the like are provided. Is required.

  Further, as shown in FIGS. 1 and 2, the fixed body 138 fixed to the other end of the rotating shaft 132 has a structure in which the rotating shaft 132 is inserted and fixed, so that the axial coupling force can be improved. The fixed body 138 must be formed thick.

  And since the convex part 138a is formed in one side of the fixed body 138 in order to make the brush 154 and the commutator 134 contact as shown in FIG. 2, size reduction of a vibration motor becomes difficult.

  Further, since the commutator 134 is divided into a plurality of segments, a spark is generated between the commutator 134 and the brush 154 when the brush 154 contacts from one segment to the other segment. The spark generated as described above has a problem of causing damage to the commutator 134 and the brush 154.

  The present invention is for solving the above-described conventional problems, and the rotating shaft portion adjacent to the eccentric weight is improved to a one-end support type by the protruding body to improve the impact resistance, thereby improving the bearing. To provide a bar type vibration motor with improved contact structure between a commutator and a brush and a coupling structure between a fixed body and a rotating shaft so that uneven wear can be prevented and the vibration motor can be reduced in size. And

  It is another object of the present invention to provide an improved vibration motor in which a varistor is attached to the commutator to prevent damage to the brush and the commutator due to sparks.

  Also, by providing a space between the eccentric weight and one end of the body to secure a necessary space when assembling the vibration motor, it is possible to provide a bar type vibration motor that can be easily mounted without using separate fixing parts. Objective.

  In order to achieve the above object, the present invention provides a stator having a body and a magnet fixed to the body, an eccentric weight fixed to one end, a fixed body fixed to the other end, and adjacent to the eccentric weight. A rotating shaft whose one end is supported so that the part can be rotated by the body, a commutator composed of a plurality of segments fixed to one side of the fixed body, and fixed to the fixed body and arranged to be separated from the magnet; A power source including a rotor portion including a commutator and an electric element electrically connected to each other, a fixed cap fixed to the body, and a brush attached to the fixed cap and supplying a current to the electric element A bar type vibration motor including a supply unit is provided.

  Preferably, the body includes a bearing seating groove projecting to one side, is integrally connected to the bearing seating groove, and is disposed inside the body, and a support tube is formed on the outer surface of the magnet. It can be a double tube structure.

  Further, the present invention provides a stator portion comprising a hollow tube-shaped body having a double tube structure in which a bearing seating groove protruding on one side is formed, and a magnet fixed to the inner surface of the body. One end is supported to be rotatable by a bearing fixed to the bearing seating groove, an eccentric weight is fixed to one end so as to be adjacent to the bearing, and a fixed body to which a commutator is attached is fixed to the other end. A rotor part having a rotating shaft and an electric element fixed to the fixed body and arranged to be separated from the magnet, a fixing cap fixed to the body, and a board member attached to the fixing cap are electrically connected Provided is a bar-type vibration motor including a power supply unit that is connected and includes a brush that supplies current to an electric element.

  Further, the fixed body has a flat disk shape, and an electric element can be fixed around the fixed body.

  Preferably, the fixed body may be integrally formed with the rotation shaft so as to include a coupling member coupled to the rotation shaft, and the coupling member may be a snap ring fixed to the rotation shaft, It can be a pin inserted and fixed to the rotating shaft.

  The commutator may be a conductive metal piece fixed to one side surface of the fixed body and electrically connected to the electric element.

  Preferably, the commutator may be a conductive pattern formed on one side of the fixed body and electrically connected to the electric element.

  Preferably, the commutator may be a substrate printed with a conductive pattern fixed to one side of the fixed body and electrically connected to the electric element.

  More preferably, the substrate can be either a printed circuit board (PCB) or a flexible printed circuit board (FPC).

  Preferably, the commutator may be protruded from a connecting portion that is electrically connected to the electric element, and a varistor may be formed on one side to prevent a spark due to contact with the brush.

  Also, the electric element can include a wound coil.

  In addition, the brush can be fixed to be electrically connected to a substrate member mounted on the fixing cap, and the substrate member can be either PCB or FPC. The brush can be bent so that the fixed end and the free end have an acute angle, and can be in elastic contact with the commutator.

  As described above, according to the present invention, a support structure for a rotating shaft is provided so that a bearing having a length capable of sufficiently dispersing the load is provided at a portion where the load is concentrated on the rotating shaft, thereby supporting the rotating shaft more stably. By improving the structure to a one-end support structure and improving the durability, it is possible to increase the service life, facilitate the assembly of the bearing and the manufacture of the body, and reduce the defect rate.

  In addition, by improving the contact structure between the commutator and the brush and the coupling structure between the fixed body and the rotating shaft so that the vibration motor can be reduced in size, a further smaller vibration motor can be realized. A varistor can be attached to prevent the brush and commutator from being damaged by sparks.

  Furthermore, a space necessary for fixing the vibration motor is ensured between the eccentric weight and the body, and an effect of facilitating the mounting can be obtained.

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

  FIG. 3 is an exploded perspective view of a bar type vibration motor according to the present invention, and FIG. 4 is a cross-sectional view of the bar type vibration motor according to the present invention.

  As shown in FIG. 3, the bar type vibration motor 1 according to the present invention includes a stator part 10, a rotor part 30, and a power supply part 50. First, the stator unit 10 will be described.

  Stator portion 10 includes a body 12 and a magnet 14. The body 12 is formed in a hollow cylindrical shape, and a hollow support tube 12a is integrally formed therein.

  That is, as shown in FIG. 4, the body 12 has a double tube structure in which the support tube 12 a is connected to one side of the body 12 and is located inside the body 12. Here, a bearing seating groove 12b is formed on one side of the body 12, and the bearing seating groove 12b is located at the tip of the support tube 12a. The bearing seating groove 12b is formed by the convex portion 12c. The convex portion 12c is formed so as to protrude outward from one side of the body 12, and a bearing seating groove 12b is formed therein.

  On the other hand, the other side of the body 12 is opened in a hollow cylindrical shape.

  The bearing seating groove 12b formed as described above has a diameter larger than the inner diameter of the support tube 12a, and is integrally connected to the support tube 12a. That is, the bearing seating groove 12b and the support tube 12a are configured to be connected to form an end portion. At this time, the support tube 12 a is shorter than the length of the body 12, and the rear end portion of the support tube 12 a is configured to be located inside the body 12.

  The stator portion 10 is configured by fixing the magnet 14 to the body 12 configured as described above. The magnet 14 is fixed to the outer surface of the support tube 12a as shown in FIG.

  Next, the rotor unit 30 will be described.

  As shown in FIG. 3, the rotor unit 30 includes a rotating shaft 32 and an electric element 36. An eccentric eccentric weight 37 is fixed to one end of the rotating shaft 32. That is, the eccentric weight 37 is formed with a penetrating insertion hole 37 a, and the eccentric shaft 37 is inserted into the insertion hole 37 a and then cocked or attached with an adhesive, whereby the eccentric weight 37 is rotated. Fixed to.

  Here, the eccentric weight 37 has a center of gravity biased with respect to the insertion hole 37a. Accordingly, vibration occurs when the eccentric weight 37 having a biased center of gravity as described above rotates about the insertion hole 37a.

  On the other hand, the rotating shaft 32 to which the eccentric weight 37 is fixed at one end as described above is supported and fixed at one end so as to be rotatable on the body 12.

  That is, as shown in FIG. 4, the bearing 16 is inserted into the bearing seating groove 12 b of the body 12, but the rotary shaft 32 is supported at one end so as to be rotatable by the bearing 16, and the support pipe 12 a of the body 12. Arranged to be inserted into.

  At this time, the eccentric weight 37 is arranged so that the rotating shaft 32 is adjacent to the portion supported by the bearing 16. That is, the bearing 16 that supports the rotating shaft 32 so as to be adjacent to the eccentric weight 37 is not deformed by an impact force generated by the eccentric weight 37 when an impact is applied from the outside, and the impact force is sufficiently dispersed. Formed.

  On the other hand, as described above, the fixed body 38 is fixed to the other end of the rotating shaft 32 whose one end is supported so as to be rotatable on the body 12. A commutator 34 made of a conductive metal piece divided into a plurality of segments is fixed to one side surface of the fixed body 38.

  At this time, unlike the conventional fixed body, the fixed body 38 has a flat disk shape in which no convex portion is formed on one side surface, and a flat type commutator 34 is attached to the one side surface.

  A cylindrical electric element 36 is fixed around the fixed body 38. The electric element 36 is arranged around the rotation shaft 32 in parallel with the rotation shaft 32 and separated from the magnet 14. The electric element 36 may include a coil bundle (not shown) around which a coil (not shown) is wound.

  At this time, as described above, the commutator 34 composed of a plurality of segments and fixed to one side surface of the fixed body 38 is electrically connected to the electric elements 36 fixed around the fixed body 38. It is configured as follows. That is, the commutator 34 is electrically connected by an electric wire (not shown) or the like so that current can be supplied to a coil wound around the electric element 36 or a coil bundle of the electric element 36.

  Therefore, when power is applied to the commutator 34 from the outside, current is supplied to the electric elements 36 respectively.

  On the other hand, in the present embodiment, the commutator 34 is made of a conductive metal piece. However, instead of fixing the metal piece commutator 34 on one side of the fixed body 38, the commutator 34 is electrically conductive on one side of the fixed body 38. A structure in which the conductive pattern is directly formed and the conductive pattern and the electric element 36 are electrically connected to each other is also possible.

  Further, unlike the above, the substrate having the conductive pattern formed thereon is attached to one side surface of the fixed body 38, and, similarly to the above, the commutator having a structure for electrically connecting the conductive pattern on the substrate and the electric element 36, respectively. 34 is also applicable.

  At this time, PCB or FPC can be preferably used as the substrate, but any substrate may be used as long as the conductive pattern is formed.

  On the other hand, as shown in FIG. 4, the fixed body 38 is configured such that a coupling member 33 coupled to the other end of the rotating shaft 32 is integrally formed therein. At this time, a coupling groove 32a is formed at the other end of the rotating shaft 32, and the coupling member 33 is coupled to the coupling groove 32a.

  That is, when the coupling member 33 is coupled to the other end of the rotating shaft 32 as described above, the fixed body 38 is integrally formed with the rotating shaft 32 by being injection-molded so as to include the coupling member 33 therein. Can be done.

  Therefore, the fixed body 38 can be formed thinner while maintaining the axial coupling force between the rotating shaft 32 and the fixed body 38.

  FIG. 5 is a perspective view of the rotating shaft and the coupling member of the first embodiment of the bar type vibration motor according to the present invention, and FIG. 6 is a sectional view thereof. As shown in FIGS. 5 and 6, the coupling member 33 is formed with an opening 33 a so as to open to one side, and coupled to a coupling groove 32 a formed on the rotating shaft 32. As the coupling member 33, a snap ring is preferably applicable.

  On the other hand, FIG. 7 is a perspective view of a rotating shaft and a coupling member of a modification of the first embodiment of the bar type vibration motor according to the present invention, and FIG. 8 is a sectional view thereof. That is, as shown in FIGS. 7 and 8, a flat end 33b ′ is formed in the opening 33a ′ of the coupling member 33 ′, and the coupling groove 32a ′ formed at the other end of the rotating shaft 32 ′ is also flat. The end portion 32b ′ may be formed so that the end portion 33b ′ and the end portion 32b ′ come into contact with each other, and the coupling member 33 ′ may not be rotated with respect to the rotation shaft 32 ′.

  Therefore, the fixed body 38 injection-molded on the coupling member 33 ′ not only improves the axial coupling force with respect to the rotary shaft 32 ′ but also transmits the rotational force transmitted from the electric element 36 to the rotary shaft 32 ′. It can be transmitted more smoothly.

  FIG. 9 is a perspective view of the rotating shaft and the coupling member of the second embodiment of the bar-type vibration motor according to the present invention. As shown in FIG. 9, instead of forming a coupling groove on the rotating shaft 32 '', an insertion hole 32a '' can be formed and a pin can be used as the coupling member 33 ''.

  On the other hand, as shown in FIG. 4, a commutator 34 is fixed to one side surface of the fixed body 38, and the commutator 34 is electrically connected to an electric element 36 fixed around the fixed body 38 by wires. Can.

  FIG. 10 is a front view of a commutator made of metal pieces according to the present invention, and FIG. 11 is a rear view thereof. At this time, as shown in FIGS. 10 and 11, the commutator 34 can be formed of a metal piece divided into a plurality of segments, and a connecting portion 34 a for connecting to the electric element 36 is provided. , And can be projected on its outer periphery.

  Further, the commutator 34 may have a varistor 34b attached or formed on one side surface in order to prevent the commutator 34 from being damaged due to the occurrence of sparks upon contact with the brush described later. The varistor 34b is a non-linear semiconductor resistance element whose resistance value changes depending on the voltage applied to both ends, and is used for applications such as preventing electrical contacts from sparking and protecting electronic components from static electricity.

  On the other hand, FIG. 12 is a front view of a commutator using a PCB according to the present invention, and FIG. 13 is a rear view thereof. As shown in FIGS. 12 and 13, the commutator 34 can be formed of a PCB having a conductive pattern formed on the surface thereof. At this time, a pattern for use as the varistor 34b may be formed on one side surface of the PCB. In the present embodiment, the PCB is applied to the commutator 34, but any one can be applied to the commutator 34 as long as a conductive pattern is formed.

  Next, the power supply unit 50 will be described.

  As shown in FIG. 3, the power supply unit 50 includes a fixing cap 52 and a brush 54. The fixing cap 52 is coupled to the outer periphery of the body 12 so as to be coupled and fixed to the other side of the body 12 to be opened. An end 52b is formed.

  The fixing cap 52 coupled to the other side of the body 12 opened as described above is formed with a seating groove 52a in which the substrate member 56 can be seated. A conductive pattern is formed on the substrate member 56, and the brush 54 is fixed to the conductive pattern so as to be electrically connected. The substrate member 56 is connected to a lead wire (not shown) that is electrically connected to the conductive pattern and is supplied with current from the outside.

  Accordingly, the brush 54 is configured to supply current to the electric element 36 from the outside through the substrate member 56.

  On the other hand, as shown in FIG. 4, the brush 54 elastically contacts the commutator 34 fixed to one side surface of the fixed body 38 when the fixed cap 52 is coupled to the other end of the body 12. Composed.

  At this time, the brush 54 includes a fixed end 54a fixed on the substrate member 56 and a free end 54b that contacts the commutator 34. The fixed end 54a and the free end 54b are bent so as to form an acute angle. It is done.

  That is, when the fixed cap 52 is coupled to the other end of the body 12, the free end 54 b is pressed against the fixed end 54 a side by the fixed body 38, whereby the commutator 34 attached to one side surface of the fixed body 38 and It comes in elastic contact.

  At this time, as the substrate member 56 to which the fixed end 54a of the brush 54 is fixed, PCB, FPC, or the like can be applied. However, any substrate may be used as long as a conductive pattern is formed.

  FIG. 14 is a cross-sectional view of a third embodiment of a bar-type vibration motor according to the present invention. Unlike the first and second embodiments described above, the third embodiment fixes the magnet 14 to the inner surface of the body 12 and separates the magnet 14 from the magnet 14 by a certain distance. 36 is arranged. Since other parts in the third embodiment are the same as those in the first and second embodiments described above, description thereof is omitted.

  The operation and effect of the bar-type vibration motor 1 according to the present invention configured as described above will be described with reference to FIG.

  When a voice or text message is received by a mobile phone equipped with the bar type vibration motor according to the present invention, current is supplied to the bar type vibration motor 1 through a lead wire (not shown). That is, the current supplied through the lead wire as described above is applied to the brush 54 through the substrate member 56, and is supplied to the electric element 36 through the commutator 34 that is in elastic contact with the brush 54.

  As described above, when an electric current is supplied to the electric element 36, an eccentric weight 37 fixed to the rotating shaft 32 due to an interaction between the magnet 14 fixed in the body 12 and the electric element 36, that is, an electromagnetic induction phenomenon. Rotates and generates vibration.

  On the other hand, when an impact load is applied to the mobile phone equipped with the bar type vibration motor 1 according to the present invention, the impact load is transmitted to the stator portion 10 through the rotary shaft 32. The impact load transmitted as described above is transmitted to the bearing 16 provided at the tip of the body 12 and supporting the rotating shaft 32.

  At this time, the bearing 16 is longer than the bearing used in the conventional rotary shaft both-end support structure, and is not easily deformed by sufficiently dispersing the impact load. That is, the bar-type vibration motor 1 according to the present invention is improved to a one-end support structure so as to more stably support the portion where the load is concentrated on the rotation shaft 32, that is, the support portion of the rotation shaft 32 adjacent to the eccentric weight 37. The impact resistance was improved.

  Compared to the support structure in which the two bearings are concentric during assembly, the assembly is simplified by using only one bearing, and the part where the load is heavy is supported more stably. Accordingly, it is possible to prevent the life of the vibration motor from being shortened due to uneven wear of the bearing.

  And since it is not necessary to precisely shape the straightness and inner diameter of the support tube 12a formed inside the body 12, only the bearing seating groove 12b formed at one end of the body 12 may be precisely shaped. The manufacturing cost and defect rate of the body 12 can be reduced.

  On the other hand, even when the length of the bearing 16 is increased by improving the rotating shaft 32 to a one-end support structure as described above and forming the bearing seating groove 12b of the body 12 to the outside, There is no need to reduce the length of the magnet 14 to be mounted or increase the size of the vibration motor.

  That is, as shown in FIG. 4, the other end of the rotating shaft 32 is not supported, and the magnet 14 can be installed in that portion, so the length of the magnet 14 does not have to be reduced. Therefore, the magnetic field generation region is not reduced and the performance of the vibration motor does not deteriorate.

  The space between the eccentric weight 37 and the body 12 is secured by the bearing seating portion 12b protruding to the outside of the body 12 and can be fixed using the convex portion 12c, so that no additional fixing parts are required.

  Further, by using a flat disk-shaped fixed body 38 and improving the contact structure between the brush 54 and the commutator 34 so that the brush 54 elastically contacts the commutator 34 fixed to one side surface thereof. The deformation of the brush 54 due to the shaking generated when the rotating shaft 32 rotates can be minimized, and the size of the vibration motor can be reduced.

  On the other hand, the fixed body 38 includes a coupling member 33 that is coupled to the rotary shaft 32 and is integrally formed with the rotary shaft 32. Therefore, the fixed body 38 is formed with a thinner thickness while the fixed body 38 is formed thinner. The binding force with 32 can be maintained as it is.

  Further, by improving the fixed body 38 into a flat disk shape and improving the contact structure between the brush 54 and the commutator 34 so that the brush 54 contacts the commutator 34 fixed to one side of the fixed body 38. Thus, the convex portion 138a formed on the conventional fixed body 138 is unnecessary, and a smaller vibration motor can be realized.

  Further, by forming a varistor on one side of the commutator 34, sparks generated between the commutator 34 and the brush 54 can be reduced, and damage to the commutator 34 and the brush 54 can be reduced.

  While the embodiments of the present invention have been described above, it is understood that the present invention can be modified and changed in various ways within the scope of the spirit and field of the present invention provided by the appended claims. Anyone with ordinary knowledge can easily conceive.

It is sectional drawing of the conventional bar type vibration motor. It is a perspective view of the body of the bar type vibration motor of FIG. It is a disassembled perspective view of the bar type vibration motor by this invention. It is sectional drawing of the bar type vibration motor by this invention. It is a perspective view of the rotating shaft and coupling member of 1st Embodiment of the bar type vibration motor by this invention. It is sectional drawing of the rotating shaft and coupling member of 1st Embodiment of the bar type vibration motor by this invention. It is a perspective view of the rotating shaft and coupling member of the modification of 1st Embodiment of the bar type vibration motor by this invention. It is sectional drawing of the rotating shaft and coupling member of the modification of 1st Embodiment of the bar type vibration motor by this invention. It is a perspective view of the rotating shaft and coupling member of 2nd Embodiment of the bar type vibration motor by this invention. It is a front view of the commutator which consists of a metal piece by this invention. It is a rear view of the commutator which consists of a metal piece by this invention. It is a front view of the commutator using PCB by this invention. 1 is a rear view of a commutator using a PCB according to the present invention. FIG. It is sectional drawing of 3rd Embodiment of the bar type vibration motor by this invention.

Explanation of symbols

1, 100 Bar type vibration motor 10, 110 Stator part 12, 112 Body 12a, 112a Support pipe 12b, 112b Bearing seating groove 12c, 138a Protrusion part 14, 114 Magnet 16 Bearing 30, 130 Rotor part 32, 32 ' , 32 '', 132 Rotating shaft 32a, 32a 'Coupling groove 32a'', 37a Insertion hole 32b' End 33, 33 ', 33''Coupling member 33a, 33a' Opening 33b 'End 34, 134 Commutator 34a Connecting part 34b Varistor 36, 136 Electron element 37, 131 Eccentric weight 38, 138 Fixed body 50, 150 Power supply part 52, 152 Fixed cap 52a Seating groove 52b Coupling end 54, 154 Brush 54a Fixed end 54b Free end 56 Substrate member 102 First bearing 104 Second bearing

Claims (17)

A stator portion comprising a body and a magnet fixed to the body;
A rotating shaft on which one end is supported such that an eccentric weight is fixed to one end, a fixed body is fixed to the other end, and a portion adjacent to the eccentric weight is rotatable to the body;
A commutator comprising a plurality of segments fixed to one side of the fixed body;
A rotor part fixed to the fixed body, arranged to be spaced apart from the magnet, and comprising an electric element electrically connected to the commutator;
A fixing cap fixed to the body;
A power supply unit comprising a brush attached to the fixing cap and configured to supply current to the electric element;
A bar-type vibration motor comprising: The body includes a bearing seating groove protruding to one side, and is integrally connected to the bearing seating groove. The body is disposed inside the body, and a support tube is formed on the outer surface of the magnet. Being a double pipe structure,
The bar-type vibration motor according to claim 1. A hollow cylindrical body with a double pipe structure in which a bearing seating groove protruding on one side is formed,
A stator portion comprising a magnet fixed to the inner surface of the body;
One end is rotatably supported by a bearing fixed in the bearing seating groove, an eccentric weight is fixed to one end adjacent to the bearing, and a fixed body to which a commutator is attached is fixed to the other end. A rotation axis;
A rotor portion comprising an electric element fixed to the fixed body and arranged to be separated from the magnet;
A fixing cap fixed to the body;
A power supply unit comprising a brush electrically connected to a substrate member mounted on the fixing cap and supplying a current to the electric element;
A bar-type vibration motor comprising: The fixed body has a flat disk shape, and an electric element is fixed around it.
The bar-type vibration motor according to any one of claims 1 to 3, wherein: The fixed body is formed integrally with the rotary shaft so as to include a coupling member coupled to the rotary shaft;
The bar-type vibration motor according to any one of claims 1 to 4, wherein: The coupling member is a snap ring fixed to the rotating shaft;
The bar-type vibration motor according to claim 5. The coupling member is a pin inserted and fixed to the rotating shaft;
The bar-type vibration motor according to claim 5. The commutator is a conductive metal piece fixed to one side of the fixed body and electrically connected to the electric element,
The bar-type vibration motor according to claim 1, wherein: The commutator is a conductive pattern formed on one side of the fixed body and electrically connected to the electric element,
The bar-type vibration motor according to claim 1, wherein: The commutator is a substrate printed with a conductive pattern fixed to one side of the fixed body and electrically connected to the electric element,
The bar-type vibration motor according to claim 1, wherein: The substrate is either PCB or FPC;
The bar-type vibration motor according to claim 10. The commutator is provided with a connecting portion that is electrically connected to the electric element.
The bar-type vibration motor according to claim 1, wherein: A varistor is formed on one side of the commutator to prevent sparks due to contact with the brush,
The bar-type vibration motor according to claim 1, wherein: The electric element includes a coil;
The bar-type vibration motor according to claim 1, wherein: The brush is fixed to be electrically connected to a substrate member attached to the fixing cap;
The bar-type vibration motor according to claim 1, wherein: The substrate member is either PCB or FPC;
The bar-type vibration motor according to claim 15. The brush is bent so that the fixed end and the free end have an acute angle, and elastically contacts the commutator;
The bar-type vibration motor according to any one of claims 1 to 16, wherein:

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