JP2006304491A - Surface mounted vibrating motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a stator structure in a surface mounted vibrating motor having a simple structure for combining a metal holder function for dealing with a solder reflow process and a housing case function of a motor body, and reducing a weight and a manufacturing cost. <P>SOLUTION: An outer housing case for composing the motor body of the vibrating motor is combined with a quadratic prism solder reflow bonding fixing tool comprising a metal thin plate material. Its upper and bottom faces comprise parallel planes having a fixed region. The bottom face corresponds to a circuit board when the solder reflow bonding is implemented, and is provided with a bumpy fixing region for improving a solder bonding strength. In the surface mounted vibrating motor, a bearing located within the outer housing case of the motor body and a partial constitution of a stator comprising a cylindrical magnet are integrally molded by insert-molding using a resin for filling an interior of the outer housing case. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an electric motor for vibration generation (hereinafter referred to as a vibration motor) corresponding to solder reflow, and more particularly, to a surface mount type vibration motor that is directly soldered onto a circuit board of a mounted device, and the interior of the motor body. Concerning structure.

  Conventionally, a large number of electronic components compatible with solder reflow have been adopted as circuit components mounted on electronic devices. Such electronic components are each placed on a predetermined position (hereinafter referred to as a fixed area) on a circuit board on which paste solder is printed by an automatic machine, and then heat-treated in a batch in a heating furnace for solder reflow. Thus, the molten solder layer is bonded and fixed onto the circuit board and attached.

In addition, in the same way as the electronic component, in recent years, a vibration motor used in a mobile phone or the like has been joined and fixed to a fixed region on a circuit board by a solder reflow process, so that one chip-type electronic capable of solder reflow is possible. As a device, a surface mount type vibration motor has attracted attention. (For example, Patent Document 1)
Japanese Patent Application Laid-Open No. 11-234943

  However, the surface mount type vibration motor replaces the holding structure with the conventional elastic rubber holder, and a metal holder for solder reflow bonding to the fixed area of the circuit board is provided separately from the vibration motor body. It is necessary to attach to.

  In the case of a general surface mount type vibration motor, the shape of the metal holder on the holding side is often such that the housing case of the motor body to be placed is sandwiched and held from both sides. The metal holder having the structure is an example of a typical shape. The shape is shown in FIG.

  As shown in FIG. 6, when the metal holder 110 is combined with the vibration motor 1, the cylindrical outer housing case 12 of the vibration motor 1 is pushed from the upper opening side of the metal holder 110, and the metal holder 110 is curved on both sides. It is held and fixed by elastically supporting it with a pinching spring piece 110c and stopped with a stopper 110e, and the bottom surface portion 110d side of the metal holder 110 is bonded and fixed by solder reflow processing with the circuit board side in the next process.

  In this way, the metal holder 110 itself is a single attachment accessory that holds the vibration motor 1 and also serves as a solder fixture with the circuit board, and has a function as a fixture due to its complicated shape. On the other hand, there is a problem that the cost increase as an accessory part separate from the vibration motor main body is inevitable. The metal holder 110 is always desired to have a design that is easy to manufacture in shape, is productive, and does not cost much.

  In addition, the surface mount type vibration motor has a larger size and a larger number of parts than other general electronic parts, and has an eccentric weight with a high specific gravity. Furthermore, the current vibration motor has a shorter and smaller diameter due to the demand for downsizing the equipment itself, and when mounted on the circuit board surface, it is fixed relative to its overall weight. Therefore, there is a problem that the bonding area for performing the process is limited and the bonding strength is insufficient. For this reason, the surface mount type vibration motor as much as possible is desired to reduce the overall weight.

  In order to solve the above-mentioned problems and problems, the present invention eliminates the need to attach a metal holder to the outer periphery of the motor body separately from the vibration motor body, and the metal holder function and the motor body corresponding to solder reflow processing. It is an object of the present invention to provide a stator structure of a surface mount type vibration motor having a simple structure that has a housing case function and is light in weight and does not require manufacturing costs.

In order to solve the above-mentioned problem, the present invention according to claim 1
In a surface mount type vibration motor in which a motor with an eccentric weight attached to a rotating shaft is fixedly arranged by solder reflow bonding in a fixed region on a circuit board on the side of the device to be mounted,
The exterior housing case itself that constitutes the motor body of the vibration motor is also used as a substantially rectangular tube-shaped fixing tool made of a thin metal plate, and the upper surface portion and the bottom surface portion are configured by planes that are parallel to each other and have a constant region. The bottom surface portion is provided with a concave and convex fixed region corresponding to the circuit board at the time of solder reflow bonding and improving the solder bonding strength,
In addition, the bearings located inside the outer housing case of the motor body and a part of the structure of the stator portion made of the cylindrical magnet are integrally formed by insert molding with a resin agent filled in the outer housing case. This is a surface mount type vibration motor characterized by

On the other hand, in the present invention described in claim 2,
In a surface mount type vibration motor in which a motor with an eccentric weight attached to a rotating shaft is fixedly arranged by solder reflow bonding in a fixed region on a circuit board on the side of the device to be mounted,
The exterior housing case itself that constitutes the motor body of the vibration motor is also used as a substantially cylindrical fixture made of a thin metal plate material, the bottom surface portion is configured by a plane of a certain area, and the bottom surface portion is soldered. At the time of reflow bonding, there is provided an uneven shaped fixing region corresponding to the circuit board,
In addition, the bearings located inside the outer housing case of the motor body and a part of the structure of the stator portion made of the cylindrical magnet are integrally formed by insert molding with a resin agent filled in the outer housing case. This is a surface mount type vibration motor characterized by

Thus, according to the invention described in claim 1 and claim 2,
The exterior housing case itself that constitutes the motor body of the vibration motor is also used as a fixing tool for solder reflow joining in the form of a substantially rectangular tube made of a thin metal plate. There is no need to mount it on the outer periphery of the main body, and the number of parts and cost can be reduced.

Moreover, according to invention of Claim 1 and Claim 2,
The conventional cylindrical outer housing case having a motor structure is not required, and the entire surface mount type vibration motor can be reduced in weight.

Moreover, according to invention of Claim 1 and Claim 2,
When solder reflow bonding is performed, an uneven fixing region is provided on the bottom surface portion to correspond to the circuit board, so that the bonding strength after solder bonding on the bonding surface is improved.

Moreover, according to invention of Claim 1 and Claim 2,
By partially molding the bearings located inside the outer housing case and a part of the stator portion made of a cylindrical magnet with a resin agent filled in the outer housing case, the parts assembly accuracy can be improved. The stator structure of the surface mount type vibration motor having a simple structure that can realize improvement and productivity and can be manufactured at low cost.

<Embodiment 1>
The best mode of the surface mount type vibration motor of the present invention will be described below with reference to FIGS. 1A shown in FIG. 1 is a left side view of the surface mount type vibration motor, and FIG. 1B is a schematic cross-sectional view taken along the line AA in FIG. 1A. FIG. 2 shows a front view (a), a right side view (b), and a bottom view (c) as three-surface external views of the surface mount type vibration motor. 3 is a left side view (a) and a right side view (b) showing a schematic configuration of a resin mold portion (hatched portion) inside the surface mount type vibration motor main body.

  1 and 2 show an example of a surface mount type vibration motor according to the present embodiment. The vibration motor 1 in FIGS. 1 and 2 has a substantially cylindrical coreless motor structure in which an eccentric weight 3 is attached to the output shaft side of the rotary shaft 6.

  The vibration motor 1 includes an eccentric weight 3, a metal housing housing case 10 having a substantially square cylindrical shape constituting a motor portion, an end flange 4 fitted to one end side of the housing housing case 10, and the end flange 4 Unlike the holding structure incorporating a metal holder in a conventional general surface mount type vibration motor, as shown in FIGS. 1 and 2, the outer housing case of the vibration motor 1 is provided. 10 itself is a surface mount structure that can also be used as a solder fixture during solder reflow and does not require a metal holder frame as a separate accessory. For this reason, the bottom surface portion 10d of the exterior housing case 10 is provided with a fixing region corresponding to the circuit board at the time of solder reflow bonding.

  In FIG. 1 and FIG. 2, the concave and convex portions are combined with a rectangular shape as shown in FIG. 2 (c) on the bottom surface portion 10d of the outer housing case 10 which contacts the fixed area on the circuit board side to be placed and is soldered. A fixed region having a shape is provided, and the fixed region of the bottom surface portion 10d is aligned with the fixed region on the circuit board and fixed by solder reflow bonding.

  The exterior housing case 10 itself is formed from a metal thin plate material by press molding or drawing, and the overall shape is a substantially rectangular tube shape, and as a configuration, the front stage portion 10a having an opening hole in the axial direction and a plane are formed. It is divided into a top surface portion 10b and both side surface portions 10c, a bottom surface portion 10d having a joint surface, and a stopper 10e for stopping the end flange 4. The front portion 10a of the outer housing case 10 has a hole for inserting, positioning and fixing one bearing 7 and the rotary shaft 6, and the plane of the upper surface portion 10b is automatically formed on the circuit board during the solder reflow process. The bottom surface 10d has a concave and convex shape combined with a rectangular shape for improving solder joint strength during solder reflow bonding as described above. Has been.

  The end flange 4 is provided with a pair of power supply terminals 5 that are electrically connected to the inside of the motor body, and the power supply terminals 5 are bent at right angles toward the circuit board side plane to be attached and extend. A terminal flat surface portion 5a is provided. The terminal flat surface portion 5a of the power supply terminal 5 is disposed on the same plane as the fixed region surface of the bottom surface portion 10d of the exterior housing case 10, and at the same time as the exterior housing case 10 at the time of solder reflow bonding, the circuit board side power supply land (not shown) Connected).

  Next, the internal structure of the exterior housing 10 that corresponds to the motor body of the vibration motor 1 will be described. As shown in FIG. 1 (b), the interior of the outer housing case 10 includes a rotor portion composed of a rectifying mechanism portion 8-8 ′ and a field coil 9 arranged with the rotating shaft 6 as a central axis, and the rotor portion. A cylindrical magnet 2 as a stator portion and a bearing 7-7 ′ that rotatably supports the rotary shaft 6 are arranged in the axial direction at positions facing the field coil 9.

  At this time, as shown in FIG. 1 (b), the bearing 7-7 ′ located inside the outer housing case 10 of the motor main body and a part of the stator portion made up of the cylindrical magnet 2 are inside the outer housing case 10. The resin molding agent 11 filled in is integrally molded with an insert mold.

  Specifically, as shown in FIG. 3, a resin molding agent 11a that passes through the opening hole of the front stage portion 10a of the metallic outer housing case 10 inward and outward and holds one of the bearings 7 on the axis, and a cylindrical magnet Resin mold agent 11b that holds 2 at the axial center position, and simultaneously holds the other bearing 7 ', and resin that fills the inner peripheral portion of the outer housing case 10 that is integrated with the resin mold agents 11a and 11b. It is composed of a molding agent 11c, and these parts are arranged and fixed by an insert mold.

  With respect to the stator side resin molding agent 11, a cylindrical field coil 9 on the rotor portion side centering on the rotating shaft 6 pivotally supported by the bearing 7-7 ′ is formed between the resin molding agents 11b and 11c. The cylindrical space D is rotatably arranged through an internal and external gap. In addition, a resin molded body 9a for fixing one end of the field coil 9 to the rotor portion, and a rectifying mechanism 8-8 connected to the power supply terminal 5 of the end flange 4 for switching energization to the field coil 9. The eccentric weight 3 attached to the tip of the rotary shaft 6 is rotated using a magnetic driving force with the cylindrical magnet 2 arranged opposite to the rotary magnet 6.

  In the reflow process, the vibration motor 1 shown in FIGS. 1 and 2 is placed with the bottom surface portion 10d side of the outer housing case 10 aligned with the fixed region on the circuit board where the paste solder is applied, and the reflow process is performed. By performing heat treatment in the processing furnace, the molten paste solder is soldered onto the circuit board.

  In this way, according to the integrally formed structure by the outer housing case 2 and the resin mold agent insert mold according to the present embodiment, a metal holder is not provided separately from the vibration motor main body as in the conventional surface mounting structure, Further, it is not necessary to separately attach to the outer periphery of the motor body. In other words, it can function as a metal holder for solder reflow processing and the housing case function of the motor body, and it can reduce the weight of the vibration motor as a whole and has a simple structure that does not require manufacturing costs. A stator structure for a motor can be provided.

  The resin molding agent 11 in the present embodiment is preferably a heat-resistant resin agent having a heat-resistant temperature of around 270 ° C. For example, an LCP (liquid crystal) polymer material is suitable for the resin molding agent 11, but structurally The selection of the material is not limited to this, and can be arbitrarily selected according to the application.

<Embodiment 2>
Next, another embodiment of the surface mount type vibration motor of the present invention will be described with reference to FIG. 4 (a) shown in FIG. 4 is a left side view of the surface mount type vibration motor, and FIG. 4 (b) is a schematic cross-sectional view taken along the line AA of FIG. 4 (a). The vibration motor 1 in FIG. 4 has a cylindrical coreless motor structure in which an eccentric weight 3 is attached to the output shaft side of the rotary shaft 6 as in the first embodiment. Omitted.

  The vibration motor 1 includes the eccentric weight 3, a substantially cylindrical metal outer housing case 10 ′ constituting a motor portion, an end flange 4 fitted to one end side of the outer housing case 10 ′, and the end flange. Unlike the holding structure that incorporates a metal holder in a conventional general surface mount type vibration motor, as shown in FIG. 4, the outer housing case 10 ′ of the vibration motor 1 is provided. It is a surface-mount structure that can be used as a solder fixture during solder reflow and does not require a metal holder frame as a separate accessory. For this reason, a fixing region corresponding to the circuit board is provided on the bottom surface portion 10d of the outer housing case 10 ′ during solder reflow bonding.

  In FIG. 4, a rectangular shape as shown in FIG. 2 (c) of the first embodiment is formed on the bottom surface portion 10d of the outer housing case 10 ′ which is in contact with the fixed region on the circuit board side to be placed and soldered. A fixed region having a concave-convex shape is provided, and the fixed region of the bottom surface portion 10d is aligned with the fixed region on the circuit board and fixed by solder reflow bonding.

  The exterior housing case 10 ′ itself is formed by press molding or drawing from a metal thin plate material, has an overall cylindrical shape, and has a front stage portion 10a having an opening hole in the axial direction and a curved surface. It is divided into a cylindrical portion 10f having a bottom surface portion 10d having a joint surface and a stopper 10e for stopping the end flange 4. Further, the front portion 10a of the outer housing case 10 ′ has a hole for inserting, positioning and fixing the one bearing 7 and the rotary shaft 6, and the curved surface of the cylindrical portion 10f is a circuit board during the solder reflow process. It functions as a holding part for placing it on an automatic machine on the top, and the bottom surface part 10d has an uneven shape combined with a rectangular shape for improving solder joint strength during solder reflow joining. .

  The end flange 4 is provided with a pair of power supply terminals 5 that are electrically connected to the inside of the motor body, and the power supply terminals 5 are bent at right angles toward the circuit board side plane to be attached and extend. A terminal flat surface portion 5a is provided. The terminal flat surface portion 5a of the power supply terminal 5 is disposed on the same plane as the fixed region surface of the bottom surface portion 10d of the outer housing case 10 ′, and at the same time as the outer housing case 10 ′ during solder reflow bonding, (Not shown).

  Next, the internal structure of the exterior housing 10 ′ that corresponds to the motor body of the vibration motor 1 will be described. As shown in FIG. 4 (b), the interior of the exterior housing case 10 ′ includes a rotor portion composed of a rectifying mechanism portion 8-8 ′ and a field coil 9 arranged with the rotating shaft 6 as a central axis, and the rotor Cylindrical magnets 2 serving as stator portions and bearings 7-7 ′ that rotatably support the rotary shaft 6 are arranged in the axial direction at positions facing the partial field coils 9.

  At this time, as shown in FIG. 4 (b), a part of the stator portion including the bearing 7-7 ′ located inside the outer housing case 10 ′ of the motor body and the cylindrical magnet 2 is formed in the outer housing case 10. 'The resin molding agent 11 filled inside is integrally formed by insert molding.

  With respect to the stator side resin molding agent 11, the cylindrical field coil 9 on the rotor portion side centered on the rotating shaft 6 supported by the bearing 7-7 ′ is provided with the cylindrical magnet 2 and the outer housing case 10 ′. Is disposed in a cylindrical space D formed between the two through a space inside and outside. At this time, the inner wall of the cylindrical portion 10f of the outer housing case 10 'has a gap with the cylindrical field coil 9 that is substantially uniform all week and has a narrow gap width compared to the case of the first embodiment, and is coreless. The motor structure has good magnetic efficiency.

  In addition, the rotor portion has a rectifying mechanism 8-8 ′ connected to the feeding terminal 5 of the end flange 4 for fixing one end of the field coil 9 and switching the current to the field coil 9 at the same time. The eccentric weight 3 attached to the tip of the rotating shaft 6 is rotated using a magnetic driving force with the arranged cylindrical magnet 2.

  In the reflow process, as in the first embodiment, the vibration motor 1 is placed with the bottom surface portion 10d side of the exterior housing case 10 ′ aligned with the fixed region on the circuit board to which the paste solder is applied. And it heat-processes in a reflow processing furnace, and is solder-bonded on a circuit board with the said melted paste solder.

  Thus, according to the integral molding structure by the insert molding with the exterior housing case 2 and the resin molding agent 11 according to the present embodiment, a metal holder is not provided separately from the vibration motor main body as in the conventional surface mounting structure. In addition, it is not necessary to separately attach to the outer peripheral portion of the motor body. In other words, it can function as a metal holder for solder reflow processing and the housing case function of the motor body, and it can reduce the weight of the vibration motor as a whole and has a simple structure that does not require manufacturing costs. A stator structure for a motor can be provided.

  The resin molding agent 11 in the present embodiment is preferably a heat-resistant resin agent having a heat-resistant temperature of around 270 ° C. For example, an LCP (liquid crystal) polymer material is suitable for the resin molding agent 11, but structurally The material selection is not limited to this, and can be arbitrarily selected according to the application, as in the first embodiment.

FIG. 2A is a left side view illustrating an example of an embodiment of a vibration motor according to the present invention, and FIG. FIG. 3 is a front view (a), a right side view (b), and a bottom view (c) illustrating an example of an embodiment of a vibration motor according to the present invention. FIG. 4 is a left side view (a) and a right side view (b) showing an outline of a configuration of a resin mold portion (hatched portion) inside the vibration motor body according to the present invention. FIG. 8 is a left side view (a) showing another example of the embodiment of the vibration motor according to the present invention, and a schematic cross-sectional view taken along line AA. It is a front view (a), a right side view (b), a left side view (c), and a bottom view (d) showing an example of a metal holder for a vibration motor according to a conventional example. It is the schematic for description which shows an example of the combination of the vibration motor metal holder and vibration motor which concern on a prior art example.

Explanation of symbols

1 Vibration motor
2 Magnet
3 Eccentric weight
4 End flange
5 Power supply terminal
5a Contact plane
6 Rotating axis
7, 7 'bearing
8, 8 'rectification mechanism
9 Field coil
10, 10 ', 12 Exterior housing case
10a Front part
10b Top surface
10c Side section
10d bottom
10e stopper
10f Cylindrical part
11,11a, 11b, 11c Resin molding agent
110 metal holder
110c Nipping spring piece
110d bottom
110e stopper
110f bulge
D Cylindrical space
E Fastening hole

Claims (2)

In a surface mount type vibration motor in which a motor with an eccentric weight attached to a rotating shaft is fixedly arranged by solder reflow bonding in a fixed region on a circuit board on the side of the device to be mounted,
The exterior housing case itself that constitutes the motor body of the vibration motor is also used as a substantially rectangular tube-shaped fixing tool made of a thin metal plate, and the upper surface portion and the bottom surface portion are configured by planes that are parallel to each other and have a constant region. The bottom surface portion is provided with a concave and convex fixing region corresponding to the circuit board at the time of solder reflow bonding,
In addition, the bearings located inside the outer housing case of the motor body and a part of the structure of the stator portion made of the cylindrical magnet are integrally formed by insert molding with a resin agent filled in the outer housing case. A surface mount type vibration motor. In a surface mount type vibration motor in which a motor with an eccentric weight attached to a rotating shaft is fixedly arranged by solder reflow bonding in a fixed region on a circuit board on the side of the device to be mounted,
The exterior housing case itself that constitutes the motor body of the vibration motor is also used as a substantially cylindrical fixture made of a thin metal plate material, the bottom surface portion is configured by a plane of a certain area, and the bottom surface portion is soldered. At the time of reflow bonding, there is provided an uneven shaped fixing region corresponding to the circuit board,
In addition, the bearings located inside the outer housing case of the motor body and a part of the structure of the stator portion made of the cylindrical magnet are integrally formed by insert molding with a resin agent filled in the outer housing case. A surface mount type vibration motor.

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