WO2006028165A1

WO2006028165A1 - Flat vibration actuator

Info

Publication number: WO2006028165A1
Application number: PCT/JP2005/016508
Authority: WO
Inventors: Tomohide Aoyagi
Original assignee: Namiki Seimitsu Houseki Kabushikikaisha
Priority date: 2004-09-09
Filing date: 2005-09-08
Publication date: 2006-03-16
Also published as: TWI382879B; TW200621385A; JP2006075734A

Abstract

[PROBLEMS] By specializing the function as a vibration generator and by making the number of parts small compared to other vibrating devices to achieve rationalization, a vibration generator having a structure realizing cost reduction and producing vibration strong enough to be sensed even though the shape is flat and thin when installed in a mobile telephone or the like by means of a driving method appropriate for the structure is provided. [MEANS FOR SOLVING PROBLEMS] A flat vibration actuator has a structure comprising a mover having a magnet magnetized in the direction of vibration, a housing for accommodating the mover, a stator having coils for driving the mover. The mover vibrates by the interaction between the magnetic field generated by the coil and the one generated by the magnet of the mover. The actuator vibrates because of collision of the mover with the housing. The coils are disposed around the mover in the housing and wound in the radial direction when viewed from the vibration direction of the mover. With this structure, vibration strong enough to be sensed while the flat and thin shape is kept is produced.

Description

Specification

Flat vibration actuator

Technical field

TECHNICAL FIELD [0001] The present invention relates to a vibration linear actuator mounted on a mobile communication device such as a mobile phone and a mobile liquid crystal game machine.

[0002] Currently, a vibration generator is used for an incoming call or a music link in an information portable device such as a mobile phone. Conventionally, a cylindrical motor with an unbalanced weight attached to the rotating shaft has been used as this vibration generator. However, there is a limit to the small diameter of the cylindrical motor itself, and it also has problems in terms of automation of mounting. .

[0003] In order to overcome these points, a coin-type motor in which a flat unbalanced weight is attached to a rotating shaft has been proposed and put to practical use. Because it vibrates in the parallel direction, there is a problem that it is difficult to detect when actually mounted.

[0004] As a solution to the above problem, there is a vibration generator shown in Patent Document 1, which can be accommodated in the same space as a coin-type motor and can apply a vertical vibration to an attached substrate.

[0005] Further, as a device for applying a vertical vibration to the attached substrate, a multi-function vibration actuator having both a vibration function, a speaker function, and a buzzer function has been developed as shown in Patent Document 2.

Patent Document 1: JP 2003-154314

Patent Document 2: JP-A-10-14194

Disclosure of the invention

Problems to be solved by the invention

However, since the vibration generator shown in Patent Document 1 has a structure in which a movable part is supported by a panel, vibration can be obtained only at a frequency near the natural frequency. For example, when vibrating in accordance with music, a low frequency Vibration at around 10Hz becomes difficult. In addition, the outer yoke, which is a mover, is formed in an annular shape with a disk cut out, so that it can move sufficiently to obtain vibration. Difficult to gain weight as a child.

[0007] In addition, the multi-function actuator represented by Patent Document 2 has a problem of heat resistance of the material in the diaphragm that generates sound as a speaker due to the function used as a speaker sound source. There is a drawback that it is difficult to incorporate into the solder reflow process used during board assembly. In addition, since it has both sound source and vibration functions, it was difficult to satisfy both acoustic and vibration characteristics within a limited thickness.

[0008] Therefore, the present invention specializes in the function as a vibration generating device, and has a configuration in which the manufacturing cost is reduced by reducing the number of parts compared to each of the above-described vibrating devices and rationalizing the configuration. It is an object of the present invention to provide a vibration generator that provides sufficient vibration to be sensed even when mounted on a mobile phone or the like by a driving method suitable for the above.

Means for solving the problem

[0009] In order to solve the above-mentioned problem, in the invention according to claim 1, a housing having a magnet magnetized in a vibration direction, a case for housing the housing, and a cover force for closing the opening of the case And the structure of the coil force arranged to drive the mover. The mover vibrates due to the interaction between the magnetic field generated by the coil and the magnetic field generated by the magnet of the mover, and vibrates due to the collision between the mover and the housing. In the flat vibration actuator, a plurality of the coils are arranged so as to surround the mover inside the housing, and the coil is wound around an axis perpendicular to the vibration direction of the mover. As a feature.

[0010] The invention of claim 2 is characterized in that, in the invention of claim 1, the coil disposed around the mover is wound around a coil core of a magnetic material.

[0011] In the invention according to claim 3, in the flat vibration actuator according to claim 1 or 2, an opening is provided on the coil side around the magnet, in which the mover is disposed surrounding the magnet. It is characterized by the fact that it has a yoke force.

[0012] The invention according to claim 4 is characterized in that, in the flat vibration actuator according to claim 3, the coil core is disposed in an opening provided in the yoke.

[0013] The invention according to claim 5 is characterized in that in the invention according to any one of claims 1 to 4, the magnetic material is arranged outside the coil or the housing. . [0014] The invention according to claim 6 is the invention according to any one of claims 1 to 5.

V is characterized by the fact that a damper is placed on the mover or case and cover.

[0015] In the invention according to claim 7, in the invention according to any one of claims 1 to 5, the end face of the mover or the coil core is at least one of an R shape, a chamfered shape, and a tapered portion. It is characterized by having one.

[0016] In the invention according to claim 8, in the invention according to any one of claims 1 to 7, the shaft extended in the vibration direction is disposed in the cover and the case through the mover, It is characterized by having a bearing at the part where the shaft and the mover come into contact.

[0017] In the invention according to claim 9, in the invention according to any one of claims 1 to 8, the gap between the mover and the coil or the coil core is adjusted, so that the gap is not generated during driving. It is characterized by limiting the amount of movement of air that flows through the.

The invention's effect

[0018] According to the invention of claim 1, each time the direction of the current flowing through the coil is changed by placing the magnet fixed in the repulsion direction in the magnetic field generated by the coil, the mover provided with the magnet becomes a case or cover. The vibration is transmitted to the housing side.

[0019] In the present invention, since the coil disposed inside the housing is wound around an axis perpendicular to the vibration direction, a magnetic flux is generated in the vicinity of the coil center. By arranging magnets magnetized in the direction of vibration perpendicular to the magnetic flux generated by the coils in the magnetic flux concentrated near the center of the coil, the magnet is surrounded by a plurality of coils.

[0020] With this structure, the magnet and the coil generate a strong magnetic action (attraction or repulsion) between them, and the magnetic flux generated by the coil and the magnetic flux generated by the magnet can be used effectively. By using the structure of the present invention having the above-described operation, it is possible to obtain a vibration actuator that generates strong vibration despite its small size and flatness. In addition, since there is no need to add a weight to the mover, the manufacturing cost can be reduced even if a plurality of coils are subtracted.

[0021] According to the invention of claim 2, by using a coil using a magnetic material as a coil core for the flat vibration actuator, it is possible to improve the magnetic efficiency of the magnetic circuit including the mover and the coil force. . [0022] According to the invention of claim 3, the mover is concentrated on the magnetic flux force S coil side by providing the magnet and the yoke having the opening on the coil side, and the magnetism of the magnetic circuit comprising the mover and the coil cage is obtained. Efficiency can be improved.

[0023] According to the invention of claim 4, by arranging the coil core in which the magnetic flux of the coil is concentrated in the opening portion in which the magnetic flux of the mover is concentrated in claim 3, the coil force and the coil force are obtained. The magnetic efficiency of the magnetic circuit can be improved.

[0024] According to the invention of claim 5, by disposing a magnetic body outside the coil or case, magnetic flux leaking to the outside of the case can be prevented, and the magnetic efficiency of the magnetic circuit comprising the mover and the coil case can be improved. Can do.

[0025] According to the invention of claim 6, it is possible to prevent damage or abnormal noise when the mover collides with the case or the cover by providing a damper on the mover or the case and the cover of the mover.

[0026] According to the invention of claim 7, the end face of the mover or the coil core portion is processed by R, chamfering, taper or the like, so that the mover and the coil or the coil core are in contact with each other and are damaged. In addition, the vibration of the mover can be prevented from being disturbed by contact.

[0027] According to the invention of Claim 8, the shaft extending in the vibration direction passes through the mover and is disposed in the cover, and the bearing is provided at a portion where the shaft and the mover come into contact with each other. Can be maintained in a certain direction, and stable vibration can be obtained without blurring.

[0028] According to the invention of claim 9, by using the air flow resistance by limiting the amount of air movement, stable vibration can be obtained without increasing the number of parts. . BEST MODE FOR CARRYING OUT THE INVENTION

[0029] Hereinafter, a vibration actuator according to an embodiment of the present invention will be described with reference to the drawings.

Example 1

FIG. 1 shows a cross-sectional view of the first embodiment used in the present invention. As can be seen from the cross-sectional view shown in FIG. 1, the flat vibratory actuator according to the present embodiment includes a mover composed of a magnet 10, Danno 50, 51, coinore 20, 21, coinore core 60, 61, canopy 30, case 31 It is composed of force.

FIG. 14 shows a perspective view of a component configuration in the present embodiment. As can be seen from Figure 14, In the sectional view of the embodiment, the coils 20, 21 and the coil cores 60, 61 are indicated by different numbers in order to distinguish the two coils. The coil 20 and the coil 21 have the same shape and are used for that. Cores 60 and 61 have the same shape. In this embodiment, it is possible to move by using a plurality of coils (four in FIG. 14) wound around the inner wall of the case 31 with the axis perpendicular to the vibration direction of the mover shown in FIG. 13 as the center of the coil. It becomes a structure that surrounds the child.

FIG. 10 shows the magnetic field direction of the magnet 10 used in this embodiment. The vibration actuator shown in this embodiment is a cross-sectional view of FIG. 1. In FIG. 1, the attractive and repulsive forces acting between the coil cores 60 and 61 where the magnetic fluxes of the coils 20 and 21 are concentrated and the magnet 10 magnetized in the thickness direction shown in FIG. Therefore, the magnet 10 vibrates in the vertical direction (arrow direction in Fig. 13), and when AC current is input to the coil, it collides alternately with the cover 30 and the case 31 to transmit the vibration.

In the present embodiment, the same technical standpoint can be configured as shown in FIG. 7, FIG. 8, and FIG. Figures 11 and 12 show the coils used in each configuration. The coil 22 wound around the coil core 62 shown in FIG. 11 has a rectangular parallelepiped shape in the direction perpendicular to the vibration direction, and the coil 23 wound around the coil core 63 shown in FIG. It is formed in a triangular prism shape by winding in a direction perpendicular to the direction. By using the coils shown in FIGS. 11, 12, and 13, various shapes of flat vibration actuators can be constructed.

Further, in the present embodiment, as shown in FIG. 2, the yokes 40 and 41 are fixed to the magnet 10, and the coil cores 60 and 61 are arranged in the yoke opening, whereby the magnetic flux of the magnet 10 concentrated on the yoke opening. The magnetic circuit is composed of the magnetic flux of the coils 20 and 21 concentrated on the coil cores 60 and 61, and the magnetic efficiency of the magnetic circuit with the magnets 10 and 20 and 21 is improved compared to the case where the yokes 40 and 41 are not provided. Can do.

[0035] In the present embodiment, the gap between the magnet 10 alone or the movable body composed of the magnet 10 and the yokes 40, 41 and the coil 20, 21 alone or the wall surface formed by the coils 20, 21 and the coil cores 60, 61 is used. By adjusting the air flow, the flow amount of air can be adjusted, and the structure using air as a damper can be obtained.

In the present embodiment, when the mover contacts the coils 20, 21, etc., vibration is prevented during driving, the coils 20, 21, or the mover are prevented from being damaged, or assembly is facilitated. R is provided at the ends of the mover and coil core 60, 61 for any purpose. [0037] However, this works even if it is not replaced by chamfering, taper processing or the like. In this embodiment, the coil cores 60, 61 used and other coil cores can be operated even when they are removed.

[0038] In the present embodiment, the damper 50, 51 is applied to the force bar 30 in order to reduce abnormal noise generated when the magnet 10 or the mover comprising the magnet 10 and the yokes 40, 41 and the cover 30, and the case 31 collide. Although it is provided on the case 31! /, The same effect can be obtained if it is provided on the side of the movable element facing the cover 30 and the case 31. Even when the dampers 50 and 51 are removed, it is possible to operate the flat vibration actuator.

Example 2

FIG. 3 shows a cross-sectional view of the second embodiment used in the present invention. As can be seen from the cross-sectional view shown in FIG. 3, the flat vibration actuator according to the present embodiment includes a mover made of magnet 11 having a bearing 80, coils 20, 21 and a coil core arranged around the mover. 60, 61, dampers 52, 53, cover 30 and case 31 for housing them, and shaft 70 fixed to cover 30 and case 31 through bearing 80!

[0040] The operating principle of the flat vibration actuator according to this embodiment is the same as that described in the first embodiment. In this embodiment, since the shaft 70 is installed in the cover 30 and the case 31 through the bearing 80, the mover is driven along the shaft 70, and vibration without vibration is obtained.

[0041] Further, since the mover is driven along the shaft 70, the amount of air movement between the mover and the coils 20, 21 and the coil cores 60, 61 can be easily limited, and the air is used as a damper. If used, stable vibration can be obtained at the point.

Similarly to the first embodiment, this embodiment can also be configured as flat vibration actuators of various shapes by using the coils shown in FIGS. 11, 12, and 13.

Furthermore, from the same technical viewpoint as the present embodiment, the yokes 42 and 43 are fixed to the magnet 11 as shown in FIG. 4, and the mover is composed of the magnet 11, the bearing 80, and the yokes 42 and 43. By arranging the coil cores 60 and 61 in the yoke opening, the magnetic circuit is composed of the magnetic flux of the magnet 11 concentrated on the yoke opening and the magnetic flux of the coils 20 and 21 concentrated on the coil cores 60 and 61. Compared to the case without yokes 42 and 43, magnet 11 and coils 20, 21 The magnetic efficiency of the magnetic circuit can be improved.

[0044] In this embodiment, the mover contacts with a coil or the like to prevent vibration during driving, or the core 20, 20, 22, 23 may be damaged, or the force of the mover may be damaged. This is a force that does not require any chamfering or taper machining. The example flat vibration actuator works. In the present embodiment, the coil cores 60 and 61 and other coil cores used in this embodiment can be operated in a state where the end faces are not processed.

In the present embodiment, the dampers 52 and 53 are connected to the force bar 30 in order to reduce the noise generated when the magnet 11 or the magnet 11 and the yokes 42 and 43 and the cover 30 and the case 31 collide with each other. Although it is provided on the case 31! /, The same effect can be obtained if it is provided on the side of the movable element facing the cover 30 and the case 31. Even in the state where the dampers 52 and 53 are removed, the flat vibration actuator of this embodiment can be operated.

Example 3

FIG. 5 shows a cross-sectional view of a third embodiment used in the present invention. As can be seen from the cross-sectional view shown in FIG. 5, the flat vibration actuator according to the present embodiment includes a mover composed of a magnet 11 having yokes 44 and 45 and a bearing 80, and coils 20 disposed around the mover. 21 and coil cores 60, 61, Danno 54, 55, coils 20, 21, coil cores 60, 61 and mover are placed in cover 30 and case 31, and are further fixed to cover 30 and case 31 through bearing 80. It is made up of Shaft 70.

[0047] In the present embodiment, the yokes 44 and 45 are formed so as not to wrap around to the side facing the coils 20 and 21 of the magnet 11, thereby reducing the thickness of the flat vibration actuator and meeting the purpose of small diameter is doing.

[0048] In addition, by arranging the dampers 54, 55 only around the shaft 70, the overall thickness can be reduced.

In the present embodiment, since the mover is driven along the shaft 70 as in the second embodiment, air can be effectively used as a damper.

[0050] The operating principle of the vibration actuator according to this embodiment is the same as that described in the first embodiment. It is the same. In the present embodiment, since the shaft 70 is installed in the cover 30 and the case 31 through the bearing 80, the mover is driven along the shaft 70, and vibration without vibration is obtained.

[0051] In the present embodiment, the magnet 11 or the mover comprising the magnet 11 and the yokes 44 and 45 and the cover 30 and the dampers 54 and 55 are used to reduce the noise generated when the case 31 collides. Although it is provided on the case 31! /, The same effect can be obtained if it is provided on the side of the movable element facing the cover 30 and the case 31. Even when the dampers 54 and 55 are omitted, the vibration actuator can be operated.

[0052] In this embodiment, it is possible to prevent the vibration from being disturbed during driving or the coil or the movable element from being damaged by the movable element coming into contact with the coil or the like. Force with R on the child This works without chamfering or taper machining. The coil cores 60 and 61 and other coil cores used in this embodiment can also be operated in a removed state.

In the above three embodiments, the material of the coil cores 60, 61, 62, 63 is suitable for mass production, preferably using SUM, SPCE and magnetic materials. Further, with respect to each vibration actuator, by arranging the magnetic body 100 on the outer periphery of the vibration actuator 90 as shown in FIG. 6, there is no magnetic flux leaking to the outside with respect to the vibration actuator shown in the first to third embodiments. The magnetic efficiency of the magnetic circuit that also has the mover and coil force is improved.

[0054] In addition, each component used in the above three embodiments does not need to use a diaphragm for generating sound as a speaker, so it is not necessary to use a heat-sensitive material. Easy to incorporate into the rice field reflow process.

[0055] As described above, by using the vibration actuator according to the present embodiment, vibration that is sufficient for mass production that can obtain sufficient vibration to be detected by the collision of the mover despite the small and thin flat shape. It is possible to make an actuator.

Brief Description of Drawings

[0056] [FIG. 1] A sectional view according to the first embodiment of the present invention.

FIG. 2 is a cross-sectional view when a yoke is provided on the mover side in the first embodiment of the present invention. 圆 3] Cross-sectional view according to the second embodiment of the present invention

圆 4] In the second embodiment of the present invention, a sectional view when a yoke is provided on the mover side

[5] A sectional view according to the third embodiment of the present invention.

[6] A cross-sectional view when a magnetic material is arranged outside the vibration actuator shown in the embodiment of the present invention.

圆 7] Upper cross-sectional view when the coil wound in a rectangular parallelepiped according to the present invention is arranged in a cylindrical case

圆 8] Upper cross-sectional view when the coil is arranged at the corner in the present invention

[FIG. 9] Upper cross-sectional view of the case where the case is a rectangular vibration actuator according to the present invention. 圆 10] Schematic diagram of the magnetizing direction of the mover in the present invention

[Fig. 11] Perspective view of coil used in Figs. 7 and 9

FIG. 12 is a perspective view of the coil used in FIG.

13] Perspective view of coils used in the first to third embodiments of the present invention

[14] An exploded perspective view of the vibration actuator shown in the first embodiment of the present invention.

10, 11 Magnet

20, 21, 22, 23 coils

30 Cover

31, 32 cases

40, 41, 42, 43, 44, 45 3—

50, 51, 52, 53, 54, 55 Damba

60, 61, 62, 63 Coil core

70 shaft

80 bearings

90 Vibration actuator

100 Magnetic case

Claims

The scope of the claims

[1] A mover equipped with a magnet magnetized in the direction of vibration, a housing that houses the mover, a housing that covers the opening of the case, and a coiler structure that is arranged to drive the mover. In the flat vibration actuator, the mover vibrates due to the interaction between the magnetic field generated by the coil and the magnetic field of the magnet provided in the mover, and vibrates due to the collision between the mover and the housing.

A flat vibratory actuator, wherein a plurality of the coils are arranged around the mover inside the housing and wound around an axis perpendicular to the vibration direction of the mover.

[2] The flat vibration actuator according to claim 1, wherein the coil disposed around the mover includes a magnetic coil core.

[3] The flat vibration actuator according to claim 1 or 2, wherein the mover is arranged so as to surround the magnet and the magnet, and has a yoke force having an opening on the coil side around the magnet.

[4] The flat vibration actuator according to claim 3, further comprising a coil core, wherein the coil core is disposed in an opening provided in the yoke.

[5] The flat vibration actuator according to any one of claims 1 to 4, wherein a magnetic material is disposed outside the coil or the housing.

[6] The flat vibration actuator according to any one of claims 1 to 5, wherein the damper is disposed on the mover or the case and the cover.

7. The flat vibration actuator according to any one of claims 1 to 6, further comprising at least one of an end face shape, a chamfered shape, and a tapered portion of the mover or the coil core.

[8] The shaft according to any one of claims 1 to 7, wherein the shaft extended in the vibration direction is disposed in the cover and the case through the mover, and the bearing is provided at a portion where the shaft and the mover are in contact with each other. A flat vibration actuator.

[9] The flat vibration actuator according to any one of [1] to [8], wherein an amount of movement of air flowing through the gap between the mover and the coil or the coil core during driving is limited by adjusting a gap between the mover and the coil or the coil core.