JP2000343035A - Vibration actuator and portable terminal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vibration actuator which is capable of embodying plural mounting forms with one product form, is small in size and is good in acoustic characteristics. SOLUTION: The vibration actuator 10 has a coil 15 which is disposed in the gap of a magnetic circuit constituted by using a permanent magnet 12, a vibrator 1 which vibrates according to the relative movement of the magnetic circuit and the coil 15 according to the electric signal inputted to the coil 15 and a damper 18 which supports the magnetic circuit flexibly with respect to the vibrator 1. Further, the vibration actuator 10 has an addition plate which is fixed to the vibrator 1 and is larger than the outside diameter of the vibrator 1, a cover 3 which is disposed to face the addition plate and a vibration transmission section 2 which is interposed between the portion of the addition plate overhanging outward from the vibrator 1 and the cover and transmits the vibration to the cover 3. The cover 3 has the addition plate 1, the vibration transmission section 2 and a sound radiation hole 4 for connecting the closed space enclosed by the cover 3 to 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 mounted on a mobile communication device such as a cellular phone and having a function of generating a ringing tone, a blue voice, and a vibration. .

[0002]

2. Description of the Related Art Conventionally, when a vibration actuator is mounted on a mobile phone, for example, as shown in the example of FIG.
In this embodiment, the vibration actuator 50 is directly mounted on the housing 21 of the mobile phone. In this case, since the sound from the vibration actuator 50 is directly radiated from the housing 21 of the mobile phone, it has no sound emission hole.

As another conventional application method, as shown in FIG. 5, a vibration actuator 50 is connected to a housing sound emission hole 22 through a vibration plate 57 as an additional plate and a spacer 52 as a vibration transmission unit. Is mounted on the housing 21 of the mobile phone having the above.

[0004]

The conventional mounting method described above has a problem that the product form of the vibration actuator 50 is complicated because the product form of the vibration actuator 50 changes depending on the mounting form of the vibration actuator 50.

[0005] Therefore, an object of the present invention is to provide a vibration actuator and a portable terminal which can realize a plurality of mounting forms with one product form, are small and have good acoustic characteristics.

[0006]

According to the present invention, a permanent magnet is provided in an actuator which converts electric energy into mechanical energy to generate at least one of voice, ringing sound, and sensible vibration to the outside. A magnetic circuit configured using a coil disposed in a gap of the magnetic circuit, a vibrating body that vibrates according to a relative movement between the magnetic circuit and the coil according to an electric signal input to the coil, A damper for flexibly supporting the magnetic circuit with respect to the vibrating body, an additional plate fixed to the vibrating body, the outer diameter of which is larger than the vibrating body, a cover disposed opposite to the additional plate, A vibration transmitting unit that is interposed between a portion of the plate that protrudes outward from the vibrating body and the cover and that transmits vibration to the cover, wherein the cover includes the additional plate, the vibration; Itarubu, and the vibration actuator is obtained and having a hole for communicating the enclosed space with the outside surrounded by the cover.

According to the present invention, there is provided the vibration actuator, wherein the vibration body and the vibration transmitting portion are flexibly joined by a leaf spring.

According to the invention, in any of the vibration actuators, the center of the magnetic circuit is fixed to the center of the damper, and the vibrating body integrated with the coil is fixed to the outer periphery of the damper. A vibration actuator characterized by the above is obtained.

Further, according to the present invention, in the portable terminal, the housing has a sound emission hole, and the voice or the ringing sound is emitted outside through the housing having the sound emission hole. A portable terminal characterized by the above is obtained.

Further, according to the present invention, in the portable terminal, the voice or the ringing tone is transmitted to the casing having no sound output hole and is emitted to the outside. can get.

Further, according to the present invention, there is provided the portable terminal, wherein the case is such that voice or ringing sound is transmitted to the case and emitted to the outside.

Here, in the present invention, the volume of the closed space can be arbitrarily set by changing the diameter of the additional plate, the height of the vibration transmitting portion, the diameter of the housing or the external additional plate, Similarly, the area of the holes can be arbitrarily set by changing the shape and number of the holes.

[0013]

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

FIG. 1 is a sectional view of a vibration actuator used in a portable terminal according to a first embodiment of the present invention. FIG. 2 is a cross-sectional view showing the structure of the portable terminal to which the vibration actuator of FIG. 1 is attached.

Referring to FIG. 1, a vibration actuator 1
Numeral 0 is mounted on a mobile communication terminal such as a mobile phone, and a magnetic circuit is formed by the yoke 11 and the plate 13 so as to sandwich the disk-shaped permanent magnet 12. The central shaft 14 penetrating the permanent magnet 12, the yoke 11, and the plate 13 is shaped like a bolt in advance, penetrates the central hole 18a at the center of the damper 18, and further fits into the central hole 19 of the magnetic circuit. are doing. That is, the magnetic circuit and the damper 18 are positioned coaxially by the center shaft 14.

The damper 18 is made of metal or resin.
It has a plurality of spiral shapes to flexibly support the magnetic circuit.

The support 17 as a vibrator is made of resin, metal, or rubber.

Here, the first embodiment of the present invention differs from the prior art in that it has a diaphragm 1, a spacer-2, and a cover 3.

That is, the support 17 is fixed to the diaphragm 1 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 cover 3 made of resin or metal having a sound emission hole 4. still,
The diaphragm 1 and the spacer 2 may be formed integrally.
Further, the diaphragm 1, the spacer 2, and the cover 3 do not necessarily have to be circular. Further, the closed space surrounded by the diaphragm 1, the spacer 2, and the cover 3 needs to be a closed space where no air flows into and out of the outside except for the sound emission hole 4.

Referring to FIG. 2, there is shown a part of a portable terminal 20 in which the vibration actuator 10 shown in FIG. This mobile phone housing 21
Is provided with a housing sound emission hole 22.

Next, the operation of the vibration actuator 10 of the portable terminal will be described.

Referring to FIG. 2, the driving current is supplied to the coil 15.
, The coil 15, the outer peripheral portion 16 of the damper integrated therewith, and the support table 13 vibrate due to the reaction force with the magnetic circuit flexibly supported by the damper 18, causing the diaphragm 1 to vibrate accordingly.

When the frequency characteristics are arbitrarily set, in a frequency range of about 500 to 1500 Hz used for voice,
The diaphragm 1 realizes a flat frequency characteristic. On the other hand, in a frequency range of about 2500 Hz used for a ringing tone, a high frequency is obtained due to a closed space surrounded by the diaphragm 1, the spacer 2, and the cover 3 and a resonance effect based on the principle of the Helmholtz resonator by the sound emission holes 4. Generates sound pressure level.

FIG. 3 is a partial sectional view of a portable terminal according to a second embodiment of the present invention.

Referring to FIG. 3, the vibration actuator 10 shown in FIG. 1 is mounted on a housing 21 of a portable telephone. However, the mobile terminal 3 according to the second embodiment of FIG.
In the case of 0, the vibration actuator 10 directly vibrates the mobile phone housing 21 and a sound is radiated from the surface thereof. Therefore, as in the first embodiment shown in FIG. 21 does not have a sound emission hole.

[0027]

As described above, according to the present invention, it is possible to provide a plurality of mounting forms with one product form, and to provide a vibration actuator and a portable terminal which are small and have good acoustic characteristics. Was.

[Brief description of the drawings]

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

FIG. 2 is a cross-sectional view showing a structure of a portable terminal to which the vibration actuator of FIG. 1 is attached.

FIG. 3 is a cross-sectional view showing a structure of a portable terminal to which a portable vibration actuator according to a second embodiment of the present invention is attached.

FIG. 4 is a partial cross-sectional view illustrating an example of a portable terminal in which a vibration actuator according to the related art is mounted on a portable telephone.

FIG. 5 is a partial cross-sectional view showing another example of a portable terminal in which a vibration actuator according to the related art is mounted on a portable telephone.

[Explanation of symbols]

 Reference Signs List 1,57 Vibration plate 2,52 Spacer 3 Cover 4 Sound emission hole 10,50 Vibration actuator 11 Yoke 12 Permanent magnet 13 Plate 14 Center axis 15 Coil 16 Damper outer peripheral part 17 Support base 18 Damper 18a Center hole 19 Center hole 20,30 Mobile terminal 21 Housing 22 Sound emission hole

Claims (6)

[Claims] A vibration circuit that converts electric energy into mechanical energy to generate at least one of voice, ringing sound, and sensible vibration to the outside, a magnetic circuit configured using a permanent magnet, A coil disposed in a gap of the magnetic circuit, a vibrating body that vibrates according to a relative movement between the magnetic circuit and the coil in accordance with an electric signal input to the coil, and a flexible circuit that flexibly controls the vibrating body. A damper to be supported on the vibrating body, an additional plate having a larger outer diameter than the vibrating body fixed to the vibrating body, a cover disposed to face the additional plate, and A vibration transmission unit interposed between the overhanging portion and the cover for transmitting vibration to the cover, wherein the cover is formed by the additional plate, the vibration transmission unit, and the cover; A vibration actuator having a hole for communicating a closed space surrounded by a circle with the outside. 2. The vibration actuator according to claim 1, wherein the vibration body and the vibration transmission unit are flexibly joined by a leaf spring. 3. The vibration actuator according to claim 1, wherein a center of the magnetic circuit is fixed to a center of the damper, and a vibrator integrated with a coil is fixed to an outer periphery of the damper. Vibration actuator. 4. A telephone provided with a housing, comprising:
A mobile terminal incorporating the vibration actuator according to any one of the above. 5. The portable terminal according to claim 4, wherein the housing has a sound emission hole, and the voice or the ringing sound is emitted outside through the housing having the sound emission hole. Mobile terminal. 6. The mobile terminal according to claim 4, wherein the voice or the ringing tone is transmitted to the housing having no sound output hole and emitted to the outside.