WO2003028191A1

WO2003028191A1 - Brushless vibrating motor

Info

Publication number: WO2003028191A1
Application number: PCT/JP2002/009643
Authority: WO
Inventors: Hitoshi Sakaba; Shinya Minakuchi; Hideaki Nakamura
Original assignee: Nidec Copal Corporation
Priority date: 2001-09-19
Filing date: 2002-09-19
Publication date: 2003-04-03
Also published as: KR100909716B1; CN1473385A; CN1276570C; KR20040029954A

Abstract

A brushless vibrating motor comprises a base member having a placement surface and a parts mount surface, a circuit board disposed on the parts mount side of the base member, a flux plate, two coils, a Hall element, a shaft disposed between the two coils, a rotor fixed to the shaft and turning integrally with the shaft, a magnet disposed in the rotor to be opposed to the two roils, and a weight disposed in offset relationship with the rotor.

Description

Specification

Brushless vibration motor

Technical field

The present invention relates to a brushless vibration motor suitably used for various portable communication devices and amusement devices.

Background art

Various mobile communication devices such as mobile phones are provided with a vibration generation function for silent notification. A vibration motor is used as the vibration source. Traditionally, vibrating motors that are powerful have been inexpensive and have low power consumption with brushes. However, in recent years, brushless vibration motors have been adopted for the purpose of improving reliability.

Disclosure of the invention

Here, miniaturization and cost reduction of various portable communication devices are further progressing. Along with this, the demand for smaller and lower cost vibration motors is expected to increase further in the future.

Therefore, an object of the present invention is to provide a brushless vibration motor that can be reduced in size and cost.

A brushless vibration motor according to the present invention includes: a base member having a mounting surface and a component mounting surface; a circuit board, a flux plate, two coils / and a Hall element provided on the component mounting surface side of the base member; A shaft disposed between the two coils, a rotor fixed to the shaft and rotating integrally with the shaft, a magnet provided on the rotor so as to face the two coils, and a rotor And a weight arranged to be biased toward.

In this brushless vibration motor, the number of coils is two. By setting the number of coils to two as described above, cost can be reduced as compared with a motor having three or more coils. Also, there is space for the small number of coils. By effectively utilizing and mounting other components in the space, the size of the motor can be reduced. In addition, since this motor is equipped with a flux plate, the start of the motor becomes smooth.

The brushless vibration motor according to the present invention preferably includes a motor driving element provided on the component mounting surface side of the base member. As described above, by providing the motor driving element on the component mounting surface side of the base member, the convenience in using the motor is improved as compared with the case where the driving circuit is provided outside the motor.

In the brushless vibration motor according to the present invention, it is preferable that the motor driving element is provided below a region where the rotor rotates. With this configuration, it is possible to reduce the size of the motor by effectively using the space on the component mounting surface side of the base member.

It is preferable that the brushless vibration motor according to the present invention includes a cover that covers the base member and houses therein a circuit board, a flux plate, two coils, a hall element, a shaft, a rotor, a magnet, and a weight. With this configuration, each member provided on the base member is covered with the cover, and the intrusion of dust and the like is suppressed, so that the occurrence of a motor failure is suppressed.

In the brushless vibration motor according to the present invention, the driving system is preferably a single-phase bipolar system, and more preferably a two-phase bipolar system. This simplifies the driving control of the motor, and simplifies the driving circuit for driving the motor and the wiring on the circuit board. Also, the number of required Hall elements is reduced to one, and the cost can be further reduced.

A brushless vibration motor according to the present invention is provided on a mounting surface side of a base member, and is electrically connected to a circuit board, and includes a terminal made of a plate spring having elasticity in a direction in which a shaft extends. Is preferred. In this way, when mounting the motor on a device such as a mobile phone, it is possible to perform an assembling operation in which the motor is pressed down from the extending direction of the shaft without using soldering. Therefore, the terminal Can easily be electrically connected to other parts, and the workability in mounting on equipment is improved. Moreover, providing terminals on the mounting surface of the base member is advantageous in promoting miniaturization of equipment.

In the brushless vibration motor according to the present invention, it is preferable that the terminal is in a cantilever support state in which one end is fixed to the circuit board. In this way, it is possible to keep the electrical connection strength of the terminals appropriately by effectively utilizing the elasticity of the panel panel in a state where the motor is mounted.

The brushless vibration motor according to the present invention preferably includes a pair of terminals, and the pair of terminals is preferably arranged on a straight line so that the mounting contact portions are separated from each other. With this configuration, the pair of terminals can be aligned in a straight line by utilizing the width of the mounting surface of the base member, whereby the mounting contact portions of the pair of terminals are separated as much as possible. be able to. Therefore, it is possible to prevent a short circuit between the mounting contacts as much as possible.

It is preferable that the brushless vibration motor according to the present invention include a pair of terminals, and each of the pair of terminals is arranged to be closer to one side of the mounting surface of the base member. For example, when each terminal is arranged at the center of the base member, there is a possibility that the polarity of each terminal is wrong and the terminal is mounted on a device. Therefore, it is preferable to dispose each terminal to one side of the base member to prevent such mounting errors.

A brushless vibration motor according to the present invention includes: a spring plate piece integrally formed on a base member so as to extend along a reference surface including a mounting surface of the base member; and a metal terminal attached to the spring plate piece. Preferably, the tip of the metal terminal protrudes from the reference surface in the non-mounting state, and is displaced toward the reference surface against the spring force of the spring plate piece in the mounting state. With this configuration, when the motor is mounted on the board, the mounting surface of the base member is mounted on the board, so that the tip of the metal terminal that protrudes from the reference surface including the mounting surface in the non-mounting state is provided. The part is displaced toward the reference plane against the spring force of the spring plate piece. In this state, the spring force of the spring plate piece The distal end of the metal terminal is pressed against the substrate with a desired pressing force, and the distal end of the metal terminal and the power supply unit of the substrate come into contact with a desired contact pressure, thereby ensuring conduction. In this way, by configuring the terminal with the spring plate piece integrally formed on the base member and the metal terminal, it is possible to sufficiently suppress the increase in the size of the motor and the cost. Further, according to this terminal structure, it is possible to secure conduction with a stable pressing force by the spring force of the spring plate piece, so that the power supply can be stabilized. The brushless vibration motor according to the present invention In the above, the spring plate piece may have a cantilevered support structure or a double-sided support structure.

In the brushless vibration motor according to the present invention, the base member is formed of fiber-reinforced plastic. This is suitable for applying a desired spring force to the spring plate piece.

The above-described brushless vibration motor may be mounted to form a vibration notification device, a mobile phone, a mobile information terminal device, and an amusement device.

A terminal structure of a motor according to the present invention is a terminal structure of a motor for supplying electric power to a motor including a base member, the base member extending along a reference surface including a mounting surface of the base member. And a metal terminal attached to the spring plate piece, the tip of the metal terminal protruding from the reference surface in the non-mounting state, and the spring plate in the mounting state. It is displaced toward the reference plane against the spring force of one part.

The present invention will become more fully understood from the detailed description and the accompanying drawings, wherein: These are given by way of example only and should not be considered as limiting the invention.

BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a side sectional view showing the configuration of the brushless vibration motor according to the first embodiment. FIG. 2 is a plan view showing the configuration of the brushless vibration motor according to the first embodiment (with the cover removed).

FIG. 3 is a plan view showing the configuration of the brushless vibration motor according to the first embodiment (with the cover and the rotor removed).

FIG. 4A is a diagram showing a circuit configuration of a coil when driven by a single-phase bipolar system. FIG. 4B is a graph illustrating a torque obtained by a single-phase bipolar system. FIG. 5A is a diagram illustrating a circuit configuration of a coil when driven by a two-phase bipolar system. FIG. 5B is a graph illustrating the torque obtained by the two-phase eupola method.

FIG. 6 is a plan view showing a modified example of the brushless vibration motor according to the first embodiment.

FIG. 7 is a side sectional view showing a configuration of a brushless vibration motor according to the second embodiment.

FIG. 8 is a plan view showing the configuration of the brushless vibration motor according to the second embodiment.

(With the cover removed).

FIG. 9 is a plan view showing a configuration of a brushless vibration motor according to the second embodiment (with a cover and a rotor removed).

FIG. 10 is a side sectional view showing the configuration of a brushless vibration motor according to the third embodiment.

FIG. 11 is a plan view showing a configuration of a brushless vibration motor according to the third embodiment (with a cover removed).

FIG. 12 is a plan view showing a configuration of a brushless vibration motor according to the third embodiment (with a cover and a rotor removed).

FIG. 13 is a side sectional view showing a configuration of a brushless vibration motor according to the third embodiment (cut around terminals 42 and 44). FIG. 14 is a view of the brushless vibration motor shown in FIG. 13 as viewed from the mounting surface side. FIG. 15 is a diagram showing a modification of the brushless vibration motor according to the third embodiment. FIG. 16 is a side sectional view showing the configuration of the brushless vibration motor according to the fourth embodiment.

FIG. 17 is a plan view showing the configuration of the brushless vibration motor according to the fourth embodiment (with the cover removed).

FIG. 18 is a plan view showing a configuration of a brushless vibration motor according to the fourth embodiment (with a cover and a rotor removed).

FIG. 19 is a plan view showing the configuration of the base member.

FIG. 20 is a diagram for explaining how the spring plate piece is pushed up against the spring force via the metal terminal.

FIG. 21 is a plan view showing a modified example of the brushless vibration motor according to the fourth embodiment having another terminal structure (with a cover and a rotor removed).

FIG. 22 is a side sectional view showing the configuration of the brushless vibration motor shown in FIG. FIG. 23 is an exploded perspective view showing a mobile phone equipped with a brushless vibration motor. FIG. 24 is a partially broken perspective view showing a portable information terminal device equipped with a brushless vibration motor.

FIG. 25 is an exploded perspective view showing an amusement machine equipped with a brushless vibration motor. BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the description of the drawings, the same elements will be denoted by the same reference symbols, without redundant description. FIG. 1 is a side sectional view showing the configuration of the brushless vibration motor according to the first embodiment. FIGS. 2 and 3 are plan views showing the configuration of the brushless vibration motor. . 2 shows a state in which the cover 38 is removed for the sake of explanation, and FIG. 3 shows a state in which the rotor 30 is further removed.

As shown in FIGS. 1 to 3, the brushless vibration motor (hereinafter, also simply referred to as “motor”) 10 has a mounting surface 12 a mounted on a mounting board (not shown) and a component mounting surface opposed thereto. It has a base member 12 having a surface 12b. The base member 12 is made of a material such as plastic, fiber reinforced plastic (FRP: GFRP, CFRP), and has an approximately square outer shape.

A flux plate 14 is provided on the component mounting surface 12 b of the base member 12. The flux plate 14 is formed of, for example, a silicon steel plate, and has a function of smoothing the start of the motor 10.

A circuit board 16 is provided on the component mounting surface 12 b of the base member 12 and on the flux plate 14. The circuit board 16 has a substantially square outer shape, and has a size similar to that of the base member 12. The circuit board 16 is formed from a flexible wiring board or the like, and has printed wiring on the upper surface.

A bearing device 18 is provided at the center of the component mounting surface 12 b of the base member 12. The shaft 20 is rotatably supported by the bearing device 18.

On the circuit board 16, two coils 22 are symmetrically arranged with the shaft 20 interposed therebetween. In the present embodiment, these coils 22 are formed of flat coils. As shown in FIG. 3, a Hall element (magnetoelectric conversion element) 24 for detecting magnetism and a motor drive element 26 are provided in a region on the circuit board 16 and between these two coils 22. The other electronic elements 28 are mounted.

As shown in FIGS. 1 and 2, the rotor 20 is fixed to the shaft 20 so as to rotate integrally with the shaft 30. A ring-shaped magnet is provided on the lower surface of the rotor 30 so as to face the coil 22 provided on the circuit board 16. G 32 are provided.

As shown in FIG. 2, the rotor 30 has a disk shape whose basic shape is defined by a radius R, and about half of its side surface is extended radially outward by AR, and a wide area 30a is formed. It is formed. An arc-shaped slit 34 is formed in the wide area 30a. Further, a portion of a weight 36 made of a material having a large specific gravity, such as tundane, is introduced into the slit 34 from below the rotor 30 and fixed by caulking. As described above, since the weight 36 is biased to the rotor 30 and is imbalanced, the vibration is generated with the rotation of the shaft 20.

Further, a cover 38 is provided on the base member 12 as shown in FIG. A bearing device 40 for rotatably supporting the shaft 20 is provided on the upper surface of the cover 38. In the space formed by the cover 38 and the base member 12, a flux plate 14, a circuit board 16, a coil 22, a motor drive element 26, a hall element 24, a bearing device 18, and a shaft 20, rotor 30, magnet 32, weight 36, etc. are accommodated, and the intrusion of dust and the like from the outside is suppressed. As a result, occurrence of motor failure is suppressed, and stable operation can be performed for a long period of time.

In the motor 10 having such a configuration, as shown in FIG. 2, a coil 22, a motor driving element 26, a hall element 24, and other electronic elements 28 are arranged below a region where the rotor 30 rotates. Have been. Therefore, the space on the circuit board 16 is effectively used, and the size of the motor 10 is reduced.

Here, in the motor 10 according to the present embodiment, the magnet 32 is preferably a six-pole magnet. When the magnet 32 has six poles, the opening angle ο; of the coil 22 is 60 degrees as shown in FIG. Then, an area defined on the circuit board 16 by an angle between these coils 22] 3 (= 180-α), here an area defined by an angle of 120 degrees, A motor drive element 26, a hall element ²⁴ , and other electronic elements 28 can be mounted. On the other hand, when the magnet 32 has four poles, the opening angle of the coil 22 becomes 90 degrees, the coil 22 becomes large, and the available space on the circuit board 16 tends to be small. Also, when the magnet 32 has eight poles, the opening angle α of the coil 22 is 45 degrees, and the available space on the circuit board 16 tends to increase as the coil 22 becomes smaller. The positional accuracy of mounting the Hall element 24 becomes stricter, and the control of the motor 10 tends to be difficult. In view of the above, the magnet 32 is preferably a six-pole magnet.

In the motor 10 according to the present embodiment, the drive system is preferably a single-phase bipolar system, and more preferably a two-phase unipolar system.

The single-phase bipolar system has a circuit configuration in which two coils 22 are connected in series, as shown in Fig. 4Α. Then, based on the timing signal generated based on the signal from the Hall element 24, the combination of potentials (high (H), low (L The desired torque can be obtained by switching) and). The torque at this time is represented using one torque curve (indicated by C1) and another torque curve (indicated by C2) having a different polarity from the torque curve, as shown in FIG. 4B. By performing the above-mentioned switching at a time corresponding to the point P based on the timing signal generated based on the signal from the Hall element 24, the torque indicated by the arrow T can be obtained.

In the two-phase bipolar system, as shown in FIG. 5A, a circuit configuration is formed in which one ends of two coils 22 are grounded. Then, based on the timing signal generated based on the signal from the Hall element 24, the motor driving element 26 switches on / off of the application of the potential to each of the terminals 42, 44 by switching. A desired torque can be obtained. At this time, as shown in Fig. 5 、, the torque was calculated using the torque carp (indicated by C1) in the coil 22-1 and the torque curve (indicated by C2) in the coil 22-2. Is represented by Based on the timing signal generated based on the signal from the Hall element 24, at the time corresponding to the point Ρ, the switch By performing the ching, the torque indicated by the arrow T can be obtained.

As described above, if the driving method is the single-phase bipolar method or the two-phase bipolar method, the driving control of the motor 10 is simplified, and the driving circuit and the circuit board 1 built in the motor driving element 26 are simplified. The wiring on 6 is simplified. Also, only two coils are required, and only one Hall element 24 is required. As a result, the cost for manufacturing the motor 10 is further reduced, and the size and weight of the motor 10 are reduced.

As described above, in the brushless vibration motor 10 according to the first embodiment, the number of the coils 22 provided on the circuit board 16 is two. By setting the number of coils 22 to two as described above, cost can be reduced as compared with a motor having three or more coils. In addition, the space on the circuit board 16 is effectively used, and the motor drive element 26, the hall element 24, and other electronic elements 28 are mounted in the space, thereby reducing the size of the motor 10. It becomes possible.

Further, since the brushless vibration motor 10 according to the first embodiment includes the flux plate 14, the startup of the motor 10 can be performed smoothly.

Further, since the brushless vibration motor 10 according to the first embodiment includes the cover 38 that covers the base member 12, each member provided on the base member 12 is covered by the cover 38. Intrusion of dust and the like is suppressed. As a result, occurrence of a failure in the motor 10 is suppressed, and stable operation can be performed for a long period of time.

In the brushless vibration motor 10 according to the first embodiment, since the drive system is a single-phase bipolar system or a two-phase unipolar system, the drive control of the motor 10 is simplified, and the motor drive element 26 The driving circuit and the wiring on the circuit board 16 incorporated in the device are simplified. Also, only one Hall element 24 is required. Thereby, the cost for manufacturing the motor 10 can be further reduced.

In the brushless vibration motor 10 according to the first embodiment, the corners (41 in FIG. 3) may be removed as shown in FIG. This allows brushless vibration The size and weight of the dynamic motor 10 can be further reduced.

Next, a brushless vibration motor according to a second embodiment will be described. The same elements as those of the brushless vibration motor according to the first embodiment are denoted by the same reference numerals, and redundant description will be omitted.

FIG. 7 is a side sectional view showing a configuration of a brushless vibration motor according to the second embodiment. FIGS. 8 and 9 are plan views showing the configuration of this brushless vibration motor.

. FIG. 8 shows a state in which the cover 38 has been removed for the sake of explanation.

2 shows a state where the rotor 30 is removed.

As shown in FIGS. 7 to 9, the brushless vibration motor (hereinafter, also simply referred to as “motor”) 10 according to the second embodiment has the same basic configuration as the brushless vibration motor according to the first embodiment. In particular, differences between the configurations will be described in detail. In the motor 10 according to the second embodiment, as shown in FIGS. 8 and 9, the base member 12 has a substantially disk-shaped outer shape. On the component mounting surface 12 b of the base member 12, a six-pole flat plate 14 having a different outer shape from the flux plate of the motor according to the first embodiment is provided.

A circuit board 16 is provided on the component mounting surface 12 b of the base member 12 and on the flux plate 14. The circuit board 16 has a disk-like outer shape, and has a size similar to that of the base member 12.

On the circuit board 16, two coils 22 are symmetrically arranged with the shaft 20 interposed therebetween. In the present embodiment, these coils 22 are formed of flat coils. Then, as shown in FIG. 9, on the circuit board 16 and in a region between these two coils 22, a Hall element (magnetic-electric conversion element) 24 for detecting magnetism and a motor drive element 26 are provided. Is installed. Also, as shown in FIGS. 7 and 8, the shaft 20 is fixed so as to rotate integrally with the rotor 30. On the lower surface of the rotor 30, a ring-shaped magnet 32 is provided so as to face the coil 22 provided on the circuit board 16.

As shown in FIGS. 7 and 8, the rotor 30 has a disk shape. This rotor

A weight 36 made of a material having a large specific gravity, such as tungsten, is fixed to 30 unbalanced. That is, in a part of the angular range η of the disk-shaped rotor 30, the weight 36 is imbalanced from the upper surface to the side surface. As described above, since the weight 36 is biased to the rotor 30 and is imbalanced, the vibration is generated with the rotation of the shaft 20.

A cover 38 is provided on the base member 12 as shown in FIG. In this motor 10, the shaft 20 is rotatably supported only by the bearing device 18. As in the motor according to the first embodiment, the shaft 20 is rotatable on the cover 38. No bearing device is provided for support. In the space formed by the cover 38 and the base member 12, a flux plate 14, a circuit board 16, a coil 22, a motor drive element 26, a hall element 24, a bearing device 18, and a shaft 20, a rotor 30, a magnet 32, a weight 36, etc., are accommodated, and the intrusion of dust and the like from the outside is suppressed. As a result, occurrence of motor failure is suppressed, and stable operation can be performed for a long period of time.

As shown in Fig. 8, even with a powerful motor 10, as shown in Fig. 8, a coil / layer 22, a motor driving element 26, a hall element 24, and other electronic elements are provided below a region where the rotor 30 rotates. Are located. Therefore, the space on the circuit board 16 is effectively used, and the size of the motor 10 is reduced.

As described above, even with the brushless vibration motor 10 according to the second embodiment, the same operational effects as those of the motor according to the first embodiment can be obtained. In particular, the brushless vibration motor 10 according to the second embodiment has a circular outer shape as shown in FIGS. Since the motor 10 is removed and made compact, the motor 10 can be further reduced in size and weight.

Next, a brushless vibration motor according to a third embodiment will be described. The same elements as those of the brushless vibration motor according to the first embodiment are denoted by the same reference numerals, and redundant description will be omitted.

As shown in FIGS. 10 to 14, the brushless vibration motor according to the third embodiment (hereinafter, also simply referred to as “motor”) 10 has the same basic configuration as the brushless vibration motor according to the first embodiment. In particular, differences in the configuration will be described in detail. As shown in FIG. 10, the brushless motor 10 forms a small vibration motor to be housed in a device such as a mobile phone. The brushless motor 10 has a base member 12 having a mounting surface 12a to be mounted on a mounting board of a device (not shown) and a component mounting surface 12b opposed thereto. The base member 12 is formed of a material such as plastic or fiber reinforced plastic (FRP: GFRP, CFRP), and has a substantially square outer shape.

A flux plate 14 is fixed on the component mounting surface 12 b of the base member 12. The flux plate 14 is formed of, for example, a silicon steel plate and has a function of smoothing the start of the motor 10. The circuit board 16 supported on the component mounting surface 12 b of the base member 12 is fixed so as to cover the flux plate 14. The circuit board 16 has a substantially square outer shape, and has a size similar to that of the base member 12. The circuit board 16 is formed from a flexible wiring board or the like, and has printed wiring on the upper surface.

Further, a bearing device 18 is provided at the center of the component mounting surface 12 b of the base member 12, and the bearing device 18 rotatably supports the shaft 20. Two coils 22 are fixed on the circuit board 16 so as to sandwich the shaft 20. These coils 22 are constituted by flat coils. Further, as shown in FIG. As described above, on the circuit board 16, the Hall element (magnetoelectric conversion element) 24 for detecting magnetism, the motor driving element 26, and other electronic components 28 are mounted.

Further, as shown in FIG. 10 and FIG. 11, a rotor 30 that rotates integrally with the shaft 20 is fixed to the shaft 20. On the lower surface of the rotor 30, a ring-shaped magnet 32 is provided so as to face the coil 22 provided on the circuit board 16. As shown in FIG. 11, the rotor 30 has a disk shape whose basic shape is defined by a radius R, and about half of its side surface is extended radially outward by AR to form an extended region 30. a is formed. An arc-shaped slit 34 is formed in the extended region 30a. A part of a weight 36 made of a material having a large specific gravity, such as, for example, tungsten, is introduced into the slit 34 from below the rotor 30 and fixed by caulking. Therefore, the weight 36 is biased and fixed to the rotor 30. As described above, since the weight 36 is attached to the rotor 30 in an unbalanced manner, appropriate vibration can be generated with the rotation of the shaft 20.

In addition, a housing 19 is constituted by the base member 12 and the cover 38, and the housing 19 has, for example, a size of 1 lmm in length, 1 lmm in width, and 3.6 mm in height, Miniaturization is being pursued. Further, a radial bearing 40 that rotatably supports the shaft 20 is fitted into the center of the upper surface of the cover 38. In the housing 19, the above-mentioned flux plate 14, circuit board 16, coil 22, motor drive element 26, ball element 24, bearing device 18, shaft 20, Various components such as the rotor 30, the magnet 32, and the weight 36 are housed, and the adoption of the housing 19 appropriately prevents intrusion of dust and the like from the outside. The occurrence of failure is suppressed, and stable operation is possible over a long period of time.

Here, in the motor 10 described above, it is preferable that the magnet 32 is a six-pole magnet. When the magnet 32 has six poles, the opening angle α of the coil 22 is 60 degrees as shown in FIG. Then, on the circuit board 16, these coins 2 2 In the area defined by the angle; 8 (= 1800-0!) (The area defined by the angle of 120 degrees here), the motor driving element 26, the hall element 24, and other elements Electronic components 28 can be mounted.

Further, it is preferable that the drive system of the motor 10 is a single-phase bipolar system or a two-phase bipolar system. Thus, if the driving method is a single-phase bipolar method or a two-phase unipolar method, the driving control of the motor 10 is simplified, and the driving circuit and the circuit board 1 built in the motor driving element 26 are simplified. The wiring on 6 is simplified. In addition, the number of necessary Honoré elements 24 is one. As a result, the cost for manufacturing the motor 10 can be further reduced.

Also, in the motor 10, the number of coils 22 provided on the circuit board 16 is two by adopting a single-phase bipolar system or a two-phase bipolar system as a driving system. By setting the number of coils 22 to two as described above, cost can be reduced as compared with a motor having three or more coils. The space on the circuit board 16 is effectively used, and the motor drive element 26, the hall element 24, and other electronic components 28 are mounted in the space, thereby reducing the size of the motor 10. Can be achieved.

Here, the motor 10 according to the present embodiment includes terminals 42 and 44 for supplying electric power. As shown in FIGS. 13 and 14, the terminals 42 and 44 are arranged on the mounting surface 12 a of the base member 12 and one end is fixed to the circuit board 16. This is a metal plate panel in a cantilever support state. One end of each of the terminals 42 and 44 is bent in an L-shape, and its base end is connected to a predetermined circuit portion of the circuit board 16 via solder 45 and mechanically fixed. I have. Further, the free ends of the terminals 42, 44 extend in a direction perpendicular to the direction in which the shaft 20 extends, and have elasticity in the direction in which the shaft 20 extends. Then, the fixed ends of the terminals 42 and 44 are inserted into the through holes 47 formed in the base member 12 and extend so as to penetrate the circuit board 16. On the other hand, the exposed portions of the terminals 42 and 44 are formed on the base member 12. It is accommodated in the rectangular terminal accommodating portion concave portion 46 to ensure the surface mounting of the motor 10 on the mounting board.

Conventionally, as a technique of such a terminal for electrical connection, there is a technique disclosed in Japanese Patent Application Laid-Open No. 2000-245103. In the motor described in this publication, power is supplied to each coil by exposing terminals for electrical connection to the outside and mechanically joining each terminal to another component by soldering. However, when the motor is incorporated into a small portable information terminal device, etc., if the terminals exposed to the outside of the housing by soldering are electrically connected to the internal substrate, the workability of assembling into the device is poor. In addition, the terminals must be provided with a metal surface in consideration of soldering, and it has been difficult to promote the miniaturization of equipment!

On the other hand, in the motor 10 according to the third embodiment, by adopting the terminals 42 and 44 having such a configuration, when the motor 10 is mounted on a device such as a mobile phone, soldering is used. In addition, it is possible to perform an assembling operation in which the cover 38 of the motor 10 is pressed from the direction in which the shaft 20 extends. Therefore, the terminal 42 and other components can be electrically easily joined, so that the workability of assembling into a device such as a mobile phone is improved. Moreover, as a result of arranging the terminals 42, 44 on the mounting surface 12a of the base member 12, it is advantageous in promoting miniaturization of the device. Furthermore, as a result of configuring the terminals 42 and 44 with a cantilevered support panel, in a state in which the motor 10 is mounted on the device, the electrical bonding force that effectively utilizes the elastic force is appropriately maintained. It is possible to continue.

Further, at the ends of the terminals 42, 44, mounting contact portions 42a, 44a bulging outward are integrally bent and formed. Then, the pair of terminals 42, 44 are arranged on a straight line such that the pair of left and right mounting contact portions 42a, 44a are separated from each other. In this case, the pair of terminals 42, 44 can be aligned in a straight line within the mounting surface 12a by utilizing the spread of the rectangular mounting surface 12a of the base member 12. As a result, the pair of left and right mounting contact portions 42a, 44a can be separated as much as possible. it can. Therefore, short-circuiting between the mounting contacts can be prevented as much as possible.

Further, as shown in FIG. 14, the terminals 42 and 44 are arranged close to one side of the mounting surface 12 a of the base member 12. Here, when the mounting contact portions 42a and 44a are arranged in the center of the base portion 12, there is a possibility that the terminals 42 and 44 may be mounted on the device with wrong polarities. Such mounting errors may cause the circuit of the motor 10 to be damaged. On the other hand, by arranging the terminals 42 and 44 so as to be close to one side of the mounting surface 12a of the base member 12, such mounting errors can be prevented.

In the brushless vibration motor 10 according to the present embodiment, as shown in FIG.

The terminal 52 having the mounting contact portion 52a and the terminal 54 having the mounting contact portion 54a may be aligned in parallel with each other on the mounting surface 12a side of the base member 12. . Further, an elastic member such as rubber may be sandwiched between the leaf spring-shaped terminal 42 and the base member 12 so that the elastic member may be housed in the terminal housing recess 46. As a result, more appropriate electrical bonding can be obtained by cooperation between the panel-shaped terminals 42 and an elastic member such as rubber. Note that the same applies to the panel-like terminals 44.

Next, a brushless vibration motor according to a fourth embodiment will be described. The same elements as those of the brushless vibration motor according to the first embodiment are denoted by the same reference numerals, and redundant description will be omitted.

FIG. 16 is a side sectional view showing the configuration of the motor according to the fourth embodiment. Figure 1

7 and 18 are plan views showing the configuration of this motor. FIG. 17 shows a state in which the force par is removed for the sake of explanation, and FIG. 18 shows a state in which the rotor is further removed. FIG. 19 is a plan view showing a configuration of a base member included in the motor according to the present embodiment.

As shown in FIGS. 16 to 19, the brushless vibration motor (hereinafter, also simply referred to as “motor”) 10 has a mounting surface 12a and a component mounting surface 12b opposed thereto. It has a single member 12. The base member 12 is formed of a material such as elastic plastic or fiber reinforced plastic (FRP: GFRP, CFRP), and has a substantially square outer shape.

As shown in FIGS. 16 and 18, a flux plate 14 is provided on the component mounting surface 12 b of the base member 12. The flux plate 14 can be formed of, for example, a silicon steel plate, and has a function of smoothly starting the motor 10.

A circuit board 16 is provided on the component mounting surface 12 b of the base member 12 and on the flux plate 14. The circuit board 16 has a substantially square outer shape, and has a size similar to that of the base member 12. The circuit board 16 is made of an elastic material such as fiber reinforced plastic (FRP), or a flexible board, and has a printed wiring on its upper surface. A bearing device 18 is provided at the center of the component mounting surface 12 b of the base member 12. The shaft 20 is rotatably supported by the bearing device 18.

On the circuit board 16, two coils 22 are symmetrically arranged with the shaft 20 interposed therebetween. In the present embodiment, these coils 22 are formed of flat coils. As shown in FIG. 18, on the circuit board 16 and in a region between these two coils 22, a Hall element 24 for detecting magnetism, a motor driving element (IC) 26, and other electronic elements 28 Is installed.

As shown in FIGS. 16 and 17, a disk-shaped rotor 30 is fixed to the shaft 20 so as to rotate integrally with the shaft 20. A ring-shaped magnet 32 is provided on the lower surface of the rotor 30 so as to face the coil 22 provided on the circuit board 16. Thus, a rotor is constituted by the shaft 20, the rotor 30, and the magnet 32.

As shown in FIG. 17, the rotor 30 has a disk shape whose basic shape is defined by a radius R. None, about half of the side surface extends radially outward by Δ Γ to form a wide area 30a. An arc-shaped slit 34 is formed in the wide area 30a. Further, a part of a weight 36 made of a material having a large specific gravity, such as tungsten, is introduced into the slit 34 from below the rotor 30 and fixed by caulking. As described above, since the weight 36 is imbalanced to the rotor 30, vibration is generated with the rotation of the shaft 20.

A cover 38 is provided on the base member 12 as shown in FIG. A bearing device 40 for rotatably supporting the shaft 20 is provided on the upper surface of the cover 38. A circuit board 16, a coil 22, a motor drive element 26, a hall element 24, a bearing device 18, a shaft 20, a rotor 3 are provided in a space formed by the cover 38 and the base member 12. 0, accommodates members such as the magnet 32, and suppresses intrusion of dust and the like from the outside. As a result, occurrence of motor failure is suppressed, and stable operation can be performed for a long period of time.

In the motor 10 having such a configuration, the coil 22, the motor driving element (I C) 26, the Hall element 24, and the other electronic elements 28 are arranged below the region where the rotor 30 rotates. Therefore, the space on the circuit board 16 is effectively used, and the size of the motor 10 is reduced.

In the motor 10 according to the present embodiment, the magnet 32 is preferably a six-pole magnet.

Here, the motor 10 according to the present embodiment has a terminal structure 4 for supplying power.

2, 4 4 are provided. Each of the terminal structures 42 and 44 includes a spring leaf piece 43 and a metal terminal 49 attached to the spring leaf piece 43.

The spring leaf piece portion 43 extends along a reference plane including the mounting surface 12a of the base portion -12. More specifically, the lower surface of the spring plate piece 43 and the mounting surface 12a of the base member 12 are on the same plane. The longitudinal direction is along one side of the base member 12. As shown in Fig. 19, this spring leaf piece 43 is made of a tree using a mold. It is integrally formed with the base member 12 by resin molding or the like, and is cantilevered by the base member 12. Here, as described above, since the base member 12 is formed of an elastic material such as FRP, a desired spring force is applied to the spring plate piece 43.

Here, the circuit board 16 has an arm portion 17 extending along a reference surface including the mounting surface 12 a of the base member 12 and a longitudinal direction extending along one side of the circuit board 16. Are provided. The arm portion 17 is formed integrally with the circuit board 16 by punching a single board or the like, and is cantilevered by the circuit board 16. The arm portion 17 is formed so as to be located on the spring plate portion 43 with the circuit board 16 mounted on the base member 12.

As shown in FIGS. 16 and 17, a metal terminal 49 is attached to the tip of the spring plate piece 43. The tapered tail of the metal terminal 49 passes through the hole provided at the tip of the spring plate piece 43 from the lower surface and reaches the upper surface. Further, the tail portion of the metal terminal 49 is passed through a hole provided in the arm portion 17 of the circuit board 16 from the lower surface, and is fixed by soldering or the like on the upper surface. Wiring (not shown) is provided on the upper surface of the arm 17 and is connected to the wiring on the circuit board 16. Thus, the metal terminal 49 and the motor driving element 26 are electrically connected to each other via the spring on the arm 17 and the wiring on the circuit board 16. The tip portion 49 a of the metal terminal 49 is spherically processed. As described above, since the distal end portion 49a is spherically processed, the contact with the mounting substrate is stabilized as compared with the case where the distal end portion 49a is formed on a flat surface.

The motor 10 according to the present embodiment includes the pair of terminal structures 42 and 44 having the above-described configuration. The root portions of the spring plate pieces 43 provided in the terminal structures 42 and 44 are cantilevered by protrusions 12 c protruding from the base member 12.

Next, the operation and effect of the motor 10 including the terminal structures 42 and 44 having the above-described configuration will be described. In this motor 10, as shown in FIG. 16, in the non-mounting state, the tip portion 49 a of the metal terminal 49 attached to the tip of the spring plate piece 43 attaches the base member 12 It protrudes downward from the reference plane including plane 12a. This amount of protrusion affects the pressing force when mounted on a mounting board, and is required to be stable. The amount of protrusion depends on the parallelism of the spring plate piece 43 to the reference plane and the dimensional accuracy of the metal terminal 49. At this time, in the motor 10 including the terminal structures 42 and 44 according to the present embodiment, the spring plate piece 43 is formed integrally with the base member 12 and the parallelism is maintained high. Also, it is easy to maintain high dimensional accuracy of the metal terminals 49. Therefore, the amount of protrusion is stabilized.

As shown in FIG. 20, when the mounting surface 12 a of the base member 12 is mounted on the mounting board 50, the spring plate piece 43 is subjected to the spring force via the metal terminal 49. The pile is pushed up, whereby the tip 49 a of the metal terminal 49 is displaced toward the reference plane. At this time, the metal terminal 49 is pressed against the mounting board 50 with a desired pressing force by the spring force of the spring plate piece 43. Then, the tip portion 49a of the metal terminal 49 and the power supply portion (not shown) of the mounting board 50 are brought into contact with a desired contact pressure, and conduction is ensured.

Thus, in the motor 10 having such terminal structures 42, 44, the posture of the motor 10 in the mounted state is stabilized, and the pressing force is stabilized by the spring force of the spring plate piece 43. The tip portion 49 a of the metal terminal 49 is brought into contact with the power supply portion of the mounting board 50 by force. As a result, conduction is ensured, and power supply can be stabilized. In addition, the terminal structure 42, 44 can be configured by the spring plate piece 43 integrally formed with the base member 12 and the metal terminal 49, thereby sufficiently suppressing the motor 10 from being enlarged. It becomes possible. Further, since no special parts are required to construct the terminal structures 42 and 44, it is possible to suppress an increase in cost. In the brushless vibration motor 10 according to the present embodiment, the spring plate piece 43 may be supported at both ends. In this case, as shown in Fig. 21, the base member 1 2 By punching the three elongated slits 52 in parallel to each other, two two-sided supporting spring plate pieces 43 can be formed. Then, by attaching a metal terminal 49 near the center of each spring plate piece 43, terminal structures 42 and 44 are formed. In the motor having the terminal structures 42 and 44, as shown in FIG. 22, in the non-mounted state, the distal end portion 49a of the metal terminal 49 attached to the spring plate piece 43 is It protrudes below the reference surface including the mounting surface 12 a of the base member 12. Then, in the mounting state where the mounting surface 12 a of the base member 12 is mounted on the mounting board, the spring plate piece 43 is piled up by the spring force via the metal terminal 49 and pushed up. As a result, the tip 49 a of the metal terminal 49 is displaced toward the reference plane. In such a mounting state, the metal terminal 49 is pressed against the mounting board with a desired pressing force by the spring force of the spring plate piece 43. Then, the tip part 49a of the metal terminal 49 and the power supply part of the mounting board come into contact with a desired contact pressure, and conduction is ensured. As described above, even in the motor 10 having the terminal structures 42 and 44, the posture of the motor 10 in the mounted state is stabilized, and the pressing force is stabilized by the spring force of the spring plate piece 43. The tip portion 49 a of the metal terminal 49 and the power supply portion of the mounting board 50 are in contact with each other. As a result, conduction is ensured, and power supply can be stabilized. In addition, the terminal structure 42, 44 can be configured by the spring plate piece 43 integrally formed with the base member 12 and the metal terminal 49, so that the motor 10 can be sufficiently suppressed from being enlarged. It becomes possible. Further, since no special parts are required to construct the terminal structures 42 and 44, it is possible to suppress an increase in cost.

It should be noted that the brushless vibration motor according to the present invention is not limited to the above-described embodiment, but can be variously modified.

For example, the two coils 22 are arranged symmetrically with the shaft 20 interposed therebetween. However, the present invention is not limited to this.

Further, the terminal structure described in the third and fourth embodiments may be provided in the brushless vibration motor according to the second embodiment. As described above, various embodiments of the brushless vibration motor according to the present invention have been described. Various vibration notification devices can be formed by mounting the brushless vibration motor. For example, as shown in FIG. 23, a mobile phone having a vibration notification function can be formed by mounting a brushless vibration motor 10 on an internal substrate 72 of a mobile phone 70. As shown in Fig. 24, a brushless vibration motor 10 is mounted on an internal substrate 82 of a portable information terminal device 80 such as a pager or a PDA to provide a portable information terminal device having a vibration notification function. Can be formed. As shown in Fig. 25, a brushless vibration motor 10 is mounted on an internal substrate 92 of a game machine 90 such as a game machine controller or a pachinko handle to form a game machine having a vibration alerting function. can do.

Industrial applicability

According to the present invention, there is provided a brushless vibration motor that can be reduced in size and cost.

Claims

The scope of the claims

1. a base member having a mounting surface and a component mounting surface;

A circuit board, a flux plate, two coils, and a Hall element provided on the component mounting surface side of the base member;

A shaft disposed between the two coils,

A rotor fixed to the shaft and rotating integrally with the shaft; a magnet provided on the rotor so as to face the two coils; and a weight displaced toward the rotor.

A brushless vibration motor comprising:

2. The brushless vibration motor according to claim 1, further comprising a motor driving element provided on the component mounting surface side of the base member.

3. The brushless vibration motor according to claim 2, wherein the motor driving element is provided below a region where the rotor rotates.

4. A cover that covers the base member and includes a cover that accommodates the circuit board, the flux plate, the two coils, the Hall element, the shaft, the rotor, the magnet, and the weight therein. Item 4. The brushless vibration motor according to item 1.

5. The brushless vibration motor according to claim 1, wherein the driving system is a single-phase bipolar system.

6. The brushless vibration motor according to claim 1, wherein the drive system is a two-phase unipolar system.

7. The terminal according to claim 1, further comprising a terminal disposed on the mounting surface side of the base member, electrically connected to the circuit board, and formed of a panel panel having elasticity in an extending direction of the shaft. The brushless vibration motor as described.

8. The brushless vibration motor according to claim 7, wherein the terminal is in a cantilever support state in which one end is fixed to the circuit board.

9. The brushless vibration motor according to claim 7, comprising a pair of the terminals, wherein the pair of terminals are arranged on a straight line such that mounting contact portions are separated from each other.

10. The brushless vibration motor according to claim 7, comprising a pair of the terminals, wherein each of the pair of terminals is arranged close to one side of the mounting surface of the base member.

11. A spring plate piece integrally formed with the base member so as to extend along a reference surface including the mounting surface of the base member,

A metal terminal attached to the spring plate piece,

2. The metal terminal according to claim 1, wherein a tip end of the metal terminal protrudes from the reference surface in a non-mounting state, and is displaced toward the reference surface in a mounted state by staking the spring force of the spring plate piece. 3. Brushless vibration motor.

12. The brushless vibration motor according to claim 11, wherein the spring plate piece has a cantilever support structure.

13. The brushless vibration motor according to claim 11, wherein the spring plate piece has a double-supported structure.

14. The base member is made of fiber reinforced plastic.

11. The brushless vibration motor according to 1.

15. A vibration alerting device equipped with the brushless vibration motor according to claim 1.

16. A mobile phone equipped with the brushless vibration motor according to claim 1.

17. A portable information terminal device equipped with the brushless vibration motor according to claim 1.

18. An amusement machine equipped with the brushless vibration motor according to claim 1.

1 9. A motor terminal structure for supplying power to a motor having a base member,

A spring plate piece integrally formed with the base member so as to extend along a reference surface including a mounting surface of the base member;

A metal terminal attached to the spring plate piece, A terminal structure of a motor, wherein a tip end of the metal terminal protrudes from the reference surface in a non-mounting state, and is displaced toward the reference surface in a mounted state by being piled by a spring force of the spring plate piece.