JP2000333430A - Oscillating actuator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To maintain high output sound-pressure level and arbitrarily set frequency characteristics, regardless of the design and thickness of an external box. SOLUTION: An oscillating actuator 10 is provided with an oscillating plate 1, that is an additional plate having larger diameter than that of the oscillating member fixed to the oscillating body, an external plate body comprising an external box 22 or an external additional plate, and a spacer 2 as an oscillation transmitting part, that is interposed between a part projecting outwardly from the oscillating member of the external additional plate and the external plate body and transmits the oscillation to the external plate body. Also the external plate member comprises an external additional plate, an oscillation transmitting part, and holes 3 that make an enclosed space 4 surrounded by the external plate body communicate with the outside.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration actuator, and more particularly, to a vibration actuator which is mounted on a mobile communication device such as a portable telephone and has a function of generating a ringing sound, a voice and a vibration.

[0002]

2. Description of the Related Art Conventionally, in a vibration actuator disclosed in Japanese Patent Application No. 6-324997 (name: vibration actuator for pager), for example, as shown in FIG. 5, a permanent magnet 12, a yoke 11, and a plate 13 are used. A magnetic circuit 21 is configured. The magnetic circuit 21 is supported by a damper 18 and a support rubber 52 having a flexible structure attached to a claw-shaped protrusion 51 provided on the support base 17 so as to be vertically movable. When a drive current is applied to the coil 15, the magnetic circuit 21 moves up and down in the axial direction, and the coil 15 transmits vibration to the outside via the damper outer peripheral portion 16 and the support 17. A central shaft 14 is provided for connecting the yoke 11, the permanent magnet 12, and the plate 13 to the damper 18, and an elastic member 19 is provided for preventing the yoke 11 from directly colliding with the support 17. I have.

[0003]

In the above-described conventional vibration actuator, when sound is generated, the vibration of an external housing is a main sound source. Therefore, the output sound pressure level depends on the design and thickness of the housing. However, there is a disadvantage that the frequency characteristics cannot be set arbitrarily.

[0004] Therefore, a technical object of the present invention is to provide a vibration actuator which can maintain a high output sound pressure level and can arbitrarily set a frequency characteristic regardless of the design and thickness of an external housing.

[0005]

According to the present invention, there is provided a magnetic circuit constituted by using a permanent magnet, a coil disposed in a gap of the magnetic circuit, and an electric signal input to the coil. In a vibration actuator having a vibrating body that vibrates according to a relative movement between the magnetic circuit and the coil, an additional plate fixed to the vibrating body and having an outer diameter larger than the vibrating body, an external housing or an external additional plate An external plate body comprising: a vibration transmitting unit that is interposed between the external plate body and a portion of the additional plate that protrudes outward from the vibrating body, and that transmits vibration to the external plate body, The vibration actuator is characterized in that the external plate has a hole that connects the outside with a closed space surrounded by the additional plate, the vibration transmission section, and the external plate.

According to the present invention, there is provided the vibration actuator, wherein the vibration transmission section is fixed to the additional plate.

According to the present invention, there is provided the vibration actuator, wherein the vibration transmission unit is fixed to the outer casing.

According to the present invention, there is provided the vibration actuator, wherein the vibration transmission unit is fixed to the external additional plate.

Further, according to the present invention, in any one of the vibration actuators, the additional plate projects outwardly from the vibrating body over the entire circumference, and the vibration transmitting portion is provided on the additional plate. A vibration actuator characterized by being provided corresponding to a portion protruding outward is obtained.

According to the invention, in any one of the vibration actuators, the external additional plate projects outwardly from the vibrating body over the entire circumference, and the vibration transmitting portion is provided outside the additional plate. A vibration actuator characterized by being provided corresponding to the protruding portion is obtained.

Further, according to the present invention, in any of the above-mentioned vibration actuators, there is provided a vibration actuator, wherein the closed space has an arbitrary volume.

Further, according to the present invention, in any of the above-described vibration actuators, the vibration actuator is characterized in that the hole has an arbitrary area.

Further, according to the present invention, in any one of the vibration actuators, a vibration actuator characterized by utilizing the principle of a Helmholtz resonator by the closed space and the hole is obtained.

Further, according to the present invention, in any one of the vibration actuators described above, the magnetic circuit, the coil, and the vibrating body are provided in the closed space.

[0015]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view showing a vibration actuator according to a first embodiment of the present invention. Referring to FIG. 1, an actuator 10 is mounted on a mobile communication device such as a mobile phone. A magnetic circuit 2 is formed by a yoke 1 and a plate 13 so as to sandwich a disk-shaped permanent magnet 12.
1 is formed. The center shaft 14 is shaped like a bolt, penetrates a center hole 18a at the center of the damper 18, and
Furthermore, they are fitted into the center holes 13a, 12a, 11a of the magnetic circuit 21. That is, the magnetic circuit 2 is
1 and the damper 18 are positioned coaxially. The damper 8 is made of metal or resin and has a plurality of spiral shapes so as to flexibly support the magnetic circuit 21. Support table 1
7 is made of resin, metal, or rubber.

The vibrating body includes the coil 15, a damper 18 connected to the coil 15, a support 17, a diaphragm 1 made of metal or resin, and other components.

The elastic member 19 is provided to prevent the magnetic circuit 21 from hitting the support base 17 and generating a collision sound.
The support 17 interposed between the yoke 11 and the support 17
Adhered to.

Further, the diaphragm 1 is fixed to the support 17 as an additional plate having an outer diameter larger than the outer diameter of the support 17. A spacer 2 made of a cylindrical resin or rubber is provided on the outer peripheral edge of the diaphragm 1 as a vibration transmitting unit. The spacer 2 is connected to a housing 22 having a sound emission hole 3 and made of metal or resin.

The diaphragm 1 and the spacer 2 may be formed integrally. Further, the diaphragm 1 and the spacer 2 need not necessarily be circular. Further, the closed space 4 surrounded by the diaphragm 1, the spacer-2, and the housing 22 needs to be a closed space where no air flows into and out of the outside except for the sound emission holes 3.

In the vibration actuator having such a configuration according to the embodiment of the present invention, the driving current is supplied to the coil 5.
, The coil 15, the outer peripheral portion 16 of the damper integrated with the coil 15, and the support 17 are vibrated by the reaction force with the magnetic circuit which is flexibly supported by the damper 18, and the diaphragm 1 is vibrated accordingly.

Here, conventionally, when the frequency characteristics are arbitrarily set, the thickness and design of the housing 22 are greatly affected.

However, in the first embodiment of the present invention,
In a frequency range of about 500 to 1,500 Hz used for voice, the diaphragm 1 realizes flat frequency characteristics, and in a frequency range of about 2,500 Hz used for ringing sound, the diaphragm 1, the spacer 2, and the like. A high sound pressure level can be generated by the resonance effect based on the principle of the Helmholtz resonator by the closed space surrounded by the housing 22 and the sound emission holes 3.

FIG. 2 is a sectional view showing a vibration actuator according to a second embodiment of the present invention. The vibration actuator 20 according to the second embodiment of the present invention has a configuration in which a protector 23 made of resin is provided on the outer peripheral portion.
It has a configuration similar to that of FIG.

That is, referring to FIG. 2, the actuator 20 is mounted on a mobile communication device such as a portable telephone, and has a magnetic circuit formed by the yoke 1 and the plate 13 so as to sandwich the disk-shaped permanent magnet 12 therebetween. 21 are formed. The center shaft 14 is shaped like a bolt, and the damper 1
8 through the center hole 18a at the center of the
Center holes 13a, 12a, 11a. That is, the magnetic circuit 21 and the damper 18 are coaxially positioned by the center shaft 14. The damper 8 is a magnetic circuit 21
Have a plurality of spiral shapes so as to flexibly support.

The support base 17 can cover the magnetic circuit 21, the coil 15, the central shaft 14, the damper 18 and other vibration-excited parts by being combined with the protector 23.

The vibrating body includes the coil 15, a damper 18 connected to the coil 15, the support 17, the diaphragm 1, and other components.

The elastic member 19 is provided to prevent the magnetic circuit 21 from colliding with the support base 17 and generating a collision sound.
The support 17 interposed between the yoke 11 and the support 17
Adhered to.

Further, the diaphragm 1 is fixed to the support 17 as an additional plate having an outer diameter larger than the outer diameter of the support 17. A cylindrical spacer 2 is provided on the outer peripheral edge of the diaphragm 1 as a vibration transmitting unit. Spacer 2
Is connected to the housing 22 having the sound emission holes 3 or the external additional plate 24. The diaphragm 1 and the spacer 2 may be formed integrally. Further, the diaphragm 1 and the spacer 2 need not necessarily be circular. Also, a diaphragm 1 and a spacer 2
Further, the closed space 4 surrounded by the housing 22 needs to be a closed space in which no air flows into and out of the outside except for the sound emission hole 3.

In the vibration actuator according to the second embodiment of the present invention having such a configuration, the operation and effect thereof are the same as those of the first embodiment.

FIG. 3 is a sectional view showing a vibration actuator according to a third embodiment of the present invention. The vibration actuator 30 according to the third embodiment has the same configuration as that according to the first embodiment shown in FIG. 1 except that an external additional plate 24 is used instead of the external housing 22. Have.

Referring to FIG. 3, the actuator 30
The magnetic circuit 21 is formed by the yoke 1 and the plate 13 so as to sandwich the disk-shaped permanent magnet 12. Central axis 1
Reference numeral 4 is shaped like a bolt, penetrates the center hole 18a at the center of the damper 18, and is fitted in the center holes 13a, 12a, 11a of the magnetic circuit 21. That is, the magnetic circuit 21 and the damper 18 are coaxially positioned by the center shaft 14. The damper 8 has a plurality of spiral shapes so as to flexibly support the magnetic circuit 21.

The vibrating body comprises the coil 15, a damper 18 connected to the coil 15, the support 17, the diaphragm 1, and other components.

The elastic member 19 is provided to prevent the magnetic circuit 21 from hitting the support base 17 and generating a collision sound.
The support 17 interposed between the yoke 11 and the support 17
Adhered to.

Further, the diaphragm 1 is fixed to the support 17 as an additional plate having an outer diameter larger than the outer diameter of the support 17. A cylindrical spacer 2 is provided on the outer peripheral edge of the diaphragm 1 as a vibration transmitting unit. Spacer 2
Are connected to the external additional plate 24 having the sound emission holes 3. The diaphragm 1 and the spacer 2 may be formed integrally.
Further, the diaphragm 1, the spacer 2, and the external additional plate 24
Does not necessarily have to be a circle. Further, the closed space surrounded by the external additional plate 24 for the diaphragm 1, the spacer-2 and the housing 22 or 24 needs to be a closed space where no air flows into and out of the outside except for the sound emission hole 3.

In the vibration actuator according to the third embodiment of the present invention having such a configuration, the first and second vibration actuators
Similarly to the embodiment, when a drive current is applied to the coil 5, the coil 15, the damper outer peripheral portion 16 integrated with the coil 15, and the support base 17 are integrated by the damper 18 by a reaction force with the magnetic circuit which is flexibly supported. Vibrates, and the diaphragm 1
Vibrates.

As described above, when the frequency characteristics are arbitrarily set, the thickness and design of the housing 22 have been greatly affected in the past. However, in the third embodiment of the present invention, similar to the first and second embodiments, 500 used for voice is used.
In a frequency range of about 1,500 Hz, the diaphragm 1 realizes a flat frequency characteristic, and in a frequency range of about 2,500 Hz used for a ring tone, the diaphragm 1 is surrounded by the spacer 2 and the external additional plate 24. Closed space and sound output hole 3
A high sound pressure level is generated by the joint effect according to the Helmholtz resonator principle.

FIG. 4 is a sectional view showing a vibration actuator according to a fourth embodiment of the present invention. The actuator 40 according to the fourth embodiment has a vibration excitation portion mounted in the closed space 4 of the vibration actuators 10, 20, 30 shown in FIGS.

Referring to FIG. 4, the first type shown in FIGS.
Similarly to the vibration actuators according to the embodiments, the support base 17 is fixed to the vibration plate 1 as an additional plate.

In the vibration actuator according to the fourth embodiment, the spacer 2 can be used as a protector of a vibration excitation part.

Further, it goes without saying that the vibration actuator according to the fourth embodiment has the same effects as the first to third actuators.

[0042]

As described above, according to the present invention, a structure in which a diaphragm and a closed space capable of utilizing a resonance effect are combined is employed, so that a high sound pressure level can be obtained regardless of the design and thickness of the outer casing. It has become possible to provide an actuator that can set frequency characteristics arbitrarily.

[Brief description of the drawings]

FIG. 1 is a sectional view of a vibration actuator according to a first embodiment of the present invention.

FIG. 2 is a sectional view of a vibration actuator according to a second embodiment of the present invention.

FIG. 3 is a sectional view of a vibration actuator according to a third embodiment of the present invention.

FIG. 4 is a sectional view of a vibration actuator according to a fourth embodiment of the present invention.

FIG. 5 is a cross-sectional view showing an example of a vibration actuator according to the related art.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Vibration plate 2 Spacer 3 Sound emission hole 4 Closed space 10, 20, 30, 40, 50 Vibration actuator 11 Yoke 12 Permanent magnet 13 Plate 14 Central axis 15 Coil 16 Damper outer peripheral part 17 Support base 18 Damper 19 Elastic material 21 Magnetic circuit Reference Signs List 22 housing 23 protector 24 external additional plate 51 claw-like projection 52 support rubber

Claims (10)

[Claims] 1. A magnetic circuit formed by using a permanent magnet, a coil disposed in a gap of the magnetic circuit, and a relative position between the magnetic circuit and the coil according to an electric signal input to the coil. In a vibration actuator having a vibrating body that vibrates according to movement, an additional plate fixed to the vibrating body and having an outer diameter larger than the vibrating body, an external plate body including an external housing or an external adding plate, and the additional plate A vibration transmitting unit that is interposed between a portion protruding outward from the vibrating body and the external plate and transmits vibration to the external plate, wherein the external plate includes the additional plate, A vibration actuator, comprising: a vibration transmission unit; and a hole that connects a closed space surrounded by the outer plate to the outside. 2. The vibration actuator according to claim 1, wherein the vibration transmission unit is fixed to the additional plate. 3. The vibration actuator according to claim 1, wherein the vibration transmission unit is fixed to the external housing. 4. The vibration actuator according to claim 1, wherein the vibration transmission section is fixed to the external addition plate. 5. The vibration actuator according to claim 1, wherein the additional plate projects outward from the vibrating body over the entire circumference, and the vibration transmission unit is provided on the additional plate. A vibration actuator, wherein the vibration actuator is provided corresponding to a portion protruding outward. 6. The vibration actuator according to claim 1, wherein the external additional plate projects outwardly from the vibrating body over the entire circumference, and the vibration transmission unit is provided on the external plate. A vibration actuator, wherein the vibration actuator is provided corresponding to a portion protruding outward. 7. The vibration actuator according to claim 1, wherein the closed space has an arbitrary volume. 8. The vibration actuator according to claim 1, wherein the hole has an arbitrary area. 9. The vibration actuator according to claim 1, wherein the closed space and the hole use the principle of a Helmholtz resonator. 10. The vibration actuator according to claim 1, wherein the magnetic circuit, the coil, and the vibrator are installed in the closed space.