JP2013233009A - Voice coil motor and electronic device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an operationally reliable voice coil motor, and to provide an operationally reliable electronic device.SOLUTION: A voice coil motor includes: a center pole that has a predetermined magnetic pattern formed thereon; a yoke that is cylindrically shaped, is arranged along the center pole, and surrounds an outer circumferential surface of the center pole; a coil that is arranged between the outer circumferential surface of the center pole and an inner circumferential surface of the yoke and that is moved along the center pole; a lid that closes one of two ends of the yoke; and a coil support section that is moved together with the coil. The coil support section has: a first portion that is arranged in a space covered by the yoke and the lid and that supports the coil; and a second portion that is connected to the first portion, is penetrated through the lid and arranged outside the space.

Description

  The present invention relates to a voice coil motor and an electronic device.

  For example, Patent Document 1 is known as an electronic device such as a mobile phone or a portable information terminal. In an electronic device as shown in Patent Document 1, a configuration that allows a user to detect vibration may be used. As a vibration generator for generating such vibration, for example, a vibration motor is known. As a vibration motor, for example, a configuration using a magnetic motor such as a voice coil motor is known.

JP 2010-86089 A

  In such a configuration, the conventional voice coil motor has a configuration in which a magnetic field easily leaks outside the motor. For this reason, the influence of the leaked magnetic field may affect the components inside the device, the operation of the external device, and the magnetic card.

  In view of the circumstances as described above, it is an object of the present invention to provide a voice coil motor and an electronic device with high operational reliability.

  According to the first aspect of the present invention, a center pole formed with a predetermined magnetic pattern, a yoke formed in a cylindrical shape and disposed along the center pole, and surrounding the outer peripheral surface of the center pole, A coil that is disposed between the outer peripheral surface of the center pole and the inner peripheral surface of the yoke, moves along the center pole, a lid portion that closes one of both ends of the yoke, the yoke and the lid A first portion that is disposed in a space that is closed by the portion and supports the coil, and a second portion that is connected to the first portion and passes through the lid portion and is disposed outside the space, and the coil And a coil support that moves integrally with the voice coil motor.

  According to the second aspect of the present invention, a main body portion that houses an electronic circuit and is provided with a vibration portion that vibrates in a predetermined direction, and is connected to the main body portion via the vibration portion, and the vibration of the vibration portion. Is provided with a movable part that vibrates relative to the main body part, and an electronic device is provided in which the voice coil motor according to the first aspect of the present invention is used as the vibrating part.

  According to the aspect of the present invention, it is possible to provide a voice coil motor and an electronic apparatus with high operation reliability.

1 is a perspective view illustrating a configuration of an electronic device according to an embodiment of the invention. FIG. 6 is a cross-sectional view illustrating a configuration of an electronic apparatus according to the embodiment. The disassembled perspective view which shows the structure of the voice coil motor which concerns on this embodiment. The perspective view which shows the structure of the voice coil motor which concerns on this embodiment. Sectional drawing which shows the structure of the voice coil motor which concerns on this embodiment. Sectional drawing which shows the vibration of the voice coil motor which concerns on this embodiment. Sectional drawing which shows the vibration of the electronic device which concerns on this embodiment. Sectional drawing which shows the structure of the electronic device which concerns on the modification of this invention.

Embodiments of the present invention will be described below with reference to the drawings.
[First embodiment]
FIG. 1 is a perspective view showing a configuration of an electronic device 100 according to the first embodiment of the present invention.
As shown in FIG. 1, the electronic device 100 includes a main body portion 101 formed in a rectangular plate shape and a movable portion 102 that vibrates with respect to the main body portion 101.

FIG. 2 is a diagram showing a configuration along the section AA in FIG.
As shown in FIG. 2, the main body unit 101 includes a display panel 10, a first base unit 11, a second base unit 12, a battery 13, a first substrate 14, a bottom cover 15, and a voice coil motor 16. The main body 101 is assembled in a state where these components are stacked.

  Hereinafter, in the present embodiment, an XYZ orthogonal coordinate system is used to describe the configuration of the electronic device 100. In the XYZ orthogonal coordinate system, the stacking direction of the components of the main body 101 is defined as the Z direction. A plane orthogonal to the Z direction is defined as an XY plane, and directions orthogonal to the XY plane are defined as an X direction and a Y direction, respectively.

  The display panel 10 is formed in a rectangle when viewed in the Z direction. The display panel 10 has a display surface 10a on the −Z side surface. Images such as still images and moving images are displayed on the display surface 10a. As the display panel 10, for example, a liquid crystal display panel or an organic EL panel is used. A touch panel mechanism (not shown) may be provided on the display surface 10a of the display panel 10.

  The first base unit 11 holds the display panel 10. The first base portion 11 is formed in a rectangular frame shape when viewed in the Z direction. The 1st base part 11 is formed so that the side part of the display panel 10 and the peripheral part of the display surface 10a may be enclosed. The second base portion 12 is disposed on the + Z side of the first base portion 11. A part of the second base portion 12 is supported by the first base portion 11.

  The battery 13 is formed in a plate shape whose outer shape is rectangular. The battery 13 supplies power to each part of the electronic device 100. The battery 13 is connected to each part of the electronic device 100 via a wiring (not shown). The surface 13a on the + Z side of the battery 13 is formed flat.

  The 1st board | substrate 14 is arrange | positioned so that the space where the battery 13 is arrange | positioned may be vacated. The first substrate 14 is supported by the second base portion 12. A control circuit 14 a is formed on the first substrate 14. In the electronic device 100, each unit is electrically controlled by the control circuit 14a.

  The bottom cover 15 is formed in a rectangular plate shape. The bottom cover 15 is disposed on the + Z side of the battery 13 and the first substrate 14 and is disposed so as to cover the battery 13 and the first substrate 14. A circular opening 15 a is formed at the center of the bottom cover 15. In the opening 15a, the + Z side surface 13a of the battery 13 is partially exposed.

  The voice coil motor 16 includes a center pole 31, a yoke 32, a coil 33, a lid portion 34, and a coil support portion 35. The voice coil motor 16 is configured such that the coil 33 vibrates in the Z direction when the center pole 31 reciprocates the coil 33 in the Z direction based on the control of the control circuit 14a.

  The movable part 102 has a housing 26. The casing 26 is formed so as to cover a part of the + Z side surface of the main body 101. The housing 26 is connected to the coil support portion 35 of the voice coil motor 16. Therefore, the housing 26 is provided so as to be movable in the Z direction integrally with the coil 33 and the coil support portion 35. When the coil 33 vibrates in the Z direction, the vibration of the coil 33 is transmitted to the housing 26 via the coil support portion 35, and the housing 26 vibrates in the Z direction.

  FIG. 3 is an exploded perspective view showing the configuration of the voice coil motor 16. FIG. 4 is a perspective view showing a state in which the voice coil motor 16 is assembled. FIG. 5 is a diagram showing a cross-sectional configuration of the voice coil motor 16.

  As shown in FIGS. 3 to 5, the yoke 32 is formed in a cylindrical shape using a material containing a magnetic material such as iron. The yoke 32 is open at one end in the axial direction (for example, the + Z side end in the figure), and has a bottom 32a at the other end in the axial direction (for example, the −Z side end in the figure). Is provided.

  The center pole 31 is formed in a cylindrical shape. The center pole 31 is accommodated inside the yoke 32. The center pole 31 and the yoke 32 are arranged so that the axial direction is parallel to the Z direction. The center pole 31 is disposed at the center of the yoke 32, for example. The center pole 31 is arranged so that a gap is formed around the outer peripheral surface 31 s between the outer peripheral surface 31 s and the inner peripheral surface 32 t of the yoke 32.

  The center pole 31 includes a first magnet 31a, a second magnet 31b, and a disc member 31c each formed in a disc shape having the same diameter. The center pole 31 has a configuration in which the disc member 31c is sandwiched between the first magnet 31a and the second magnet 31b in the axial direction. The first magnet 31 a is in contact with the bottom 32 a of the yoke 32. As with the yoke 32, the disc member 31c is formed using a material containing a magnetic material such as iron. Therefore, the disc member 31c has a function as a yoke.

  In the first magnet 31a, one end (for example, the upper side in the figure) in the axial direction has an N pole, and the other end (for example, the lower side in the figure) in the axial direction has an S pole. . In the second magnet 31b, one end (for example, the upper side in the drawing) in the axial direction is an S pole, and the other end (for example, the lower side in the drawing) in the axial direction is an N pole. . Therefore, as for the 1st magnet 31a and the 2nd magnet 31b, the edge part in the direction which contact | connects the disc member 31c is a north-pole. The first magnet 31 a has an S pole at the end in contact with the bottom 32 a of the yoke 32. Therefore, between the disc member 31c and the yoke 32, the disc member 31c is an N pole and the yoke 32 is an S pole.

  The coil 33 is disposed in a space K sandwiched between the outer peripheral surface 31 s of the center pole 31 and the inner peripheral surface 32 t of the yoke 32. The coil 33 is formed using, for example, a copper wire.

  The lid 34 is formed using a material containing a magnetic material such as iron, for example, like the yoke 32 described above. The lid portion 34 is disposed so as to contact the second magnet 31 b and closes the space K with the yoke 32. Therefore, the second magnet 31 b and the yoke 32 are connected via the lid portion 34. For this reason, the cover part 34 has a function as a yoke. The lid part 34 has an opening 34a formed so as to penetrate the front and back.

  The coil support portion 35 fixes and supports the coil 33. The coil support part 35 is formed in a cylindrical shape. The coil support portion 35 includes a first portion 35a inserted into the space K and wound with the coil 33, and a second portion 35b connected to the first portion 35a and disposed outside the space K. The coil support portion 35 is formed using a non-magnetic material such as plastic.

  The first part 35a and the second part 35b are detachably connected to each other. The coil support portion 35 is formed with four openings 35c in the circumferential direction. Between the openings 35 c in the circumferential direction of the coil support portion 35, a through portion 35 d that penetrates the opening 34 a is formed. In a state where the through portion 35d is inserted into the opening 34a, the coil support portion 35 can move in the Z direction by the size of the four openings 35c in the Z direction.

  In the coil support portion 35, a connection wiring 33a for connecting the coil 33 and the control circuit 14a is formed. The connection wiring 33 a passes through the opening 34 a and is routed outside the lid 34. The connection wiring 33 a is connected to the control circuit 14 a outside the lid portion 34. The coil 33 moves to one side and the other side in the axial direction when a current flows through the coil 33 by an electrical signal from the control circuit 14a. The coil support portion 35 can move integrally with the coil 33. An end on the + Z side of the coil support portion 35 is connected to the housing 26. The housing 26 can move integrally with the movement of the coil support portion 35 in the Z direction.

  In the voice coil motor 16 configured as described above, when the coil 33 is moved in the + Z direction from the state shown in FIG. 5 by the electric signal from the control circuit 14a, as shown in FIG. 35 moves in the + Z direction integrally with the coil 33. The coil support part 35 moves within a movable range corresponding to the dimension in the Z direction of the four openings 35c.

  As shown in FIG. 7, the movement of the coil support portion 35 moves the casing 26 connected to the coil support portion 35 in the + Z direction. Accordingly, the space between the main body portion 101 and the movable portion 102 spreads, and a relative movement has been performed between the main body portion 101 and the movable portion 102.

  As described above, according to the present embodiment, the center pole 31 on which a predetermined magnetic pattern is formed, and the yoke 32 that is formed along the center pole 31 and that surrounds the outer peripheral surface 31 s of the center pole 31. A coil 33 that moves between the outer peripheral surface 31 s of the center pole 31 and the inner peripheral surface 32 t of the yoke 32 and moves along the center pole 31, and a lid portion 34 that closes one of both ends of the yoke 32. The first portion 35a disposed in the space K closed by the yoke 32 and the lid portion 34 and supporting the coil 33, and the second portion 35a connected to the first portion 35a and penetrating the lid portion 34 and disposed outside the space K. Since the coil support portion 35 having the portion 35b and moving integrally with the coil 33 is provided, the coil 3 is closed via the coil support portion 35 while the space K is closed by the lid portion 34. It can be directly transmit vibrations due to the movement of the outside. Thereby, it is possible to prevent the magnetic field generated by the first magnet 31 a and the second magnet 31 b from leaking out of the voice coil motor 16. Therefore, the voice coil motor 16 and the electronic device 100 with high operation reliability can be provided.

The technical scope of the present invention is not limited to the above-described embodiment, and appropriate modifications can be made without departing from the spirit of the present invention.
For example, in the above embodiment, the configuration in which the coil support portion 35 moves along the center pole 31 has been described as an example. However, for example, as shown in FIG. The guide portion 13b that guides the movement in the direction may be formed. The guide portion 13b can be configured to be provided on a part of the electronic device 100, for example, the battery 13 on which the voice coil motor 16 is disposed. Thereby, the coil support part 35 can be vibrated with higher accuracy. Further, the guide portion 13b is provided with a through portion 13 so that a decrease in magnetic flux is prevented.

DESCRIPTION OF SYMBOLS 16 ... Voice coil motor 26 ... Housing | casing 31 ... Center pole 32 ... Yoke 33 ... Coil 34 ... Cover part 35 ... Coil support part 35a ... 1st part 35b ... 2nd part 100 ... Electronic device

Claims (4)

A center pole on which a predetermined magnetic pattern is formed;
A yoke formed in a cylindrical shape, arranged along the center pole, and surrounding an outer peripheral surface of the center pole;
A coil that is disposed between the outer peripheral surface of the center pole and the inner peripheral surface of the yoke, and moves along the center pole;
A lid portion for closing one of both ends of the yoke;
A first portion disposed in a space closed by the yoke and the lid portion and supporting the coil; and a second portion connected to the first portion and penetrating the lid portion and disposed outside the space. A voice coil motor comprising: a coil support portion that moves integrally with the coil. The coil support is
A wire connected to the coil and routed to the second part through the lid;
The voice coil motor according to claim 1, further comprising: a connection terminal provided on the second portion and connected to the wiring. A main body portion that houses an electronic circuit and is provided with a vibrating portion that vibrates in a predetermined direction;
A movable part that is connected to the main body part via the vibration part and vibrates relative to the main body part by vibration of the vibration part;
The electronic device in which the voice coil motor according to any one of claims 1 to 3 is used as the vibration unit. The electronic device according to claim 3, wherein at least one of the main body portion and the movable portion is provided with a guide portion that guides the coil support portion provided in the voice coil motor.

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