JP2002263574A - Electromagnetic converter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a small-size electromagnetic converter which obtains large vibration force, reduces noise, and is high in safety and light in weight. SOLUTION: The magnetic circuit part (a yoke 2-7, a magnet 2-8, and a plate 2-9) of a mechanical vibration system and the magnetic circuit part (a yoke 2-11, a magnet 2-12, and a plate 2-13) of a sound generation system are fixed and supported independently to face the middle part of a spring 2-6, and the input of electric signals for generating vibration and sound is made independent two systems.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a part of a portable terminal device such as a portable telephone, a pager, a computer with a transceiver, etc., which communicates with a remote device while being carried by a user or a user. The present invention relates to an electromagnetic transducer having both functions of mechanical vibration and sound generation.

[0002]

2. Description of the Related Art Conventionally, in a portable terminal device such as a portable telephone and a pager, a small acoustic sounding body as a receiving function, a small sounding body for notifying an incoming call, and a weight eccentrically attached to a rotating shaft to cause vibration. A micromotor was required. Furthermore, in order to respond to hands-free transmission / reception or generation of an enlarged sound of a ringtone or music distribution, it is necessary to attach a small speaker or the like having good sound quality.

In particular, recently, in order to meet the demands of users for miniaturization and weight reduction of portable terminal devices, for example, Japanese Utility Model Registration No. 2570923, Japanese Patent Laid-Open No. 10-2154.
Japanese Patent Application Publication No. 99-1999 and the like have proposed an electromagnetic conversion device that can combine an acoustic component and a mechanical vibration component that are individually provided.

FIG. 4 is an external view of an electromagnetic converter according to a conventional example, and FIG. 5 is a sectional view taken along line AA of FIG. 4, reference numeral 1 denotes an electromagnetic converter, 1-1 denotes a cover, 1-1a denotes an air hole, and 1-2 denotes a terminal portion.

In FIG. 5, an outer peripheral portion of a circular diaphragm 1-4 is attached to a case 1-3. Case 1
-3 has a spring 1-6 in which a plurality of spiral leaf springs are arranged in the circumferential direction, and a yoke 1-7 is fixed to an inner peripheral portion of the spring 1-6. Spring 1
The outer edge of -6 is fixedly supported by the case 1-3, and the magnet 1-8 is fixed to the center of the yoke 1-7.

The voice coil 1-5 is inserted into a magnetic gap formed by the inner peripheral surface of the yoke 1-7 and the outer peripheral surface of the magnet 1-8, and one end is fixedly supported by the diaphragm 1-4. The yoke 1-7 and the magnet 1-8 constitute a magnetic circuit unit, and the spring 1-6 and the magnetic circuit unit constitute a mechanical vibration system.

In this electromagnetic transducer, the voice coil 1-
It is a well-known fact that when an electric signal is applied to the voice coil 5, a force is applied to the voice coil 1-5. For example, when the diaphragm 1-4 has a high stiffness and the spring 1-6 has a low stiffness, a high frequency of about 200 Hz or more is applied to the voice coil 1.
When the voltage is applied to −5, the diaphragm 1-4 on which the voice coil 1-5 is attached vibrates, and functions as a so-called acoustic sounding body toward the outside in the B or B ′ direction.

When a relatively low-frequency electric signal is applied to the human sense of hearing around 130 Hz, the force generated in the voice coil 1-5 causes a large vibration due to the mechanical resonance of the low stiffness spring 1-6. And the magnetic circuit section vibrates. The vibration is transmitted to the case 1-3 via the spring 1-6.
Or it vibrates in the direction of B '.

[0009]

However, when this electromagnetic conversion device is used in a portable telephone or the like, the following problems occur.

(1) The magnitude of the vibration force of the mechanical vibration system that vibrates the members constitutes the mechanical vibration system in order to notify only the user of the incoming call while taking care not to inconvenience other people. It is proportional to the mass of the magnetic circuit and the spring 1-6 and the strength of the magnetic field of the magnet 1-8.
6 has an extremely small mass and is substantially determined by the mass of the magnetic circuit portion and the strength of the magnetic field. In addition, magnet 1-8
There is naturally a limit to strengthening the magnetic field of the yoke 1-7.
The vibration force is almost determined by the mass of the yoke magnet 1-8.

However, when the user puts the mobile phone in a pocket or the like provided in clothes, the vibration force generated by the lack of mass is weak, and the user is often unable to feel the incoming vibration. Was.

(2) In use, of course, there is a demand for a portable telephone capable of simultaneously operating a vibration function and a calling function to surely notify of an incoming call, in addition to communication of incoming calls only by vibration. Therefore, with respect to the mobile phone adopting such a usage method, in the electromagnetic conversion device, when an electric signal for vibration and sound generation is applied at the same time, mechanical vibration and sound generation are performed simultaneously, and particularly low-frequency operation is performed. The audible range sound is modulated or output as a noise sound by an electric signal for obtaining vibration, which may give a user uncomfortable feeling.

[0013] Further, the use of the portable telephone is expanded, and a simple ringtone melody, a chord ringtone melody, music distribution, etc.
Advanced sound pronunciation is also required, and the discomfort during simultaneous operation described above is further increased.

(3) Receiving, calling, vibrating, speaker 4
In many cases, the function is provided to one electromagnetic conversion device. However, a portable telephone or the like touches a sensitive ear in the vicinity of a user, particularly a receiver, and receives and receives a call. At this time, there is a danger that a loud sound is suddenly generated from the receiving section due to some trouble, and there is a danger that the user may be hindered. Therefore, it is necessary to reduce these danger factors.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems and to provide a light-weight and small-sized electromagnetic conversion device which obtains a large vibration force and reduces noise, and has high safety.

[0016]

In order to achieve the above object, a first means of the present invention is to separate a magnetic circuit portion of a mechanical vibration system and a magnetic circuit portion of an acoustic sounding system from each other independently. It is characterized by being fixedly supported opposite to the center of two springs, and having two independent electrical signal inputs for generating vibration and sound.

According to a second aspect of the present invention, in the first aspect, the diaphragm and the outer edge of the diaphragm of the acoustic sound system are fixed to a part of the yoke.

According to a third aspect of the present invention, a magnetic circuit portion of a mechanical vibration system and a magnetic circuit portion of an acoustic sound generation system are shared and fixedly supported at a central portion of one spring to generate vibration and sound. The present invention is characterized in that two independent electrical signal inputs are provided.

In the first and second means, the magnetic circuit portion of the mechanical vibration system and the magnetic circuit portion of the acoustic sounding system are independently and fixedly supported in opposition to the center of a single spring. In addition, two or more independent electric signal inputs for sound generation are provided, and a plurality of electric signals having respective functions are provided to simultaneously or arbitrarily or arbitrarily obtain predetermined vibration and sound.

In the third means, the magnetic circuit part of the mechanical vibration system and the magnetic circuit part of the sound generation system are shared and fixedly supported at the center of one spring, and the electric signal for vibration and sound generation is generated. The input is divided into two independent systems, and a plurality of electric signals that fulfill respective functions are given, thereby simultaneously or arbitrarily obtaining predetermined vibration and acoustic sound.

[0021]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an external view of an electromagnetic conversion device according to a first embodiment of the present invention, and FIG. 2 is a cross-sectional view of the electromagnetic conversion device. In FIG. 1, reference numeral 2 denotes an electromagnetic transducer according to the present embodiment, 2-1 denotes a cover, 2-1a denotes an air hole,
-2a and 2-2b indicate respective input terminal portions.

In FIG. 2, an outer peripheral portion of a disk-shaped bottom plate 2-4 having an appropriate thickness for obtaining a vibration force is fixedly supported by one end of a cylindrical case 2-3 having an appropriate thickness. I have. In addition, the bottom plate 2-4 may be formed integrally with the case 2-3. In the case 2-3, a spring 2-6 in which a plurality of spiral leaf springs are arranged in the circumferential direction is fixed and supported at an arbitrary position, and a yoke 2-7 is provided at the center of the spring 2-6. It is fixed. The plate 2-9 and the magnet 2-8 are fixed to the center of the yoke 2-7.

Further, the coil 2-5 is inserted into a magnetic gap formed by the inner peripheral surface of the yoke 2-7 and the outer peripheral surface of the plate 2-9 and the magnet 2-8.
4 is fixedly supported. Yoke 2-7 and plate 2-
9 and the magnet 2-8 constitute a magnetic circuit unit, and the coil 2-5 and the magnetic circuit unit constitute an electric-magnetic circuit unit. The electric-magnetic circuit section and the spring 2-6 constitute a mechanical vibration system. The mechanical vibration system vibrates due to the energization of the coil 2-5.

In order to obtain an acoustic sound, the yoke 2-11 is fixed to the center of the spring 2-6 so as to face the yoke 2-7, and the plate 2-13 and the magnet 2-12 are connected to the center of the yoke 2-11. It is fixed to the part. A disk-shaped diaphragm 2-10 having an appropriate thickness is a functional sound generator, and is a yoke 2-11 fixed to the spring 2-6.
The outer peripheral portion 2-10a of the diaphragm 2-10 is fixedly supported on the outer peripheral portion.

Further, the coil 2-10b is connected to the yoke 2-10.
11 and plate 2-13 and magnet 2-1
2 is inserted into a magnetic gap formed by the outer peripheral surface of the diaphragm 2 and one end is fixedly supported by the diaphragm 2-10. York 2
-11, the plate 2-13 and the magnet 2-12 form a magnetic circuit, and the coil 2-10b and the magnetic circuit constitute an electric-magnetic circuit. The electric-magnetic circuit unit and the diaphragm 2-10 constitute a sound generating system. The application of the electric signal to the coil 2-10b causes the acoustic sounding system to emit sound.

The yoke 2-7 and the yoke 2
The section -11 has an H-shaped cross section to form respective magnetic paths, and may be integrally formed or integrally fixed to the spring 2-6 or the like.

As described above, the electromagnetic transducer according to the present embodiment has a structure in which a mechanical vibration system and an acoustic sounding system are independently provided together. By applying the drive voltage as an electric signal to the coil 2-5, the spring 2
-6, yoke 2-7, plate 2-9 and magnet 2
-8 performs mechanical vibration, and the case 2-3 vibrates.

This vibration is transmitted to a portable telephone device having a built-in electromagnetic conversion device, and the portable telephone vibrates. Of course, when the frequency of the electric signal applied to the coil 2-5 matches the resonance frequency of the mechanical vibration system, it goes without saying that the vibration of the mechanical vibration system becomes maximum.

In an acoustic pronunciation system, for example, 200
By applying a frequency of about Hz or more and a predetermined driving voltage as an electric signal to the coil 2-10b, the diaphragm 2
10 vibrates to achieve a call, receive, or speak function. It goes without saying that the above-mentioned two different electric signal circuits can apply any electric signal necessary for each predetermined function and can control mechanical vibration or sound generation arbitrarily. No.

FIG. 3 is a sectional view of an electromagnetic converter according to a second embodiment of the present invention. 3, reference numeral 3 denotes an electromagnetic conversion device according to the present embodiment, 3-1 denotes a cover,
1a indicates an air hole, 3-2a and 3-2b indicate respective input terminal portions. In order to obtain mechanical vibration, a spring 3-6 in which a plurality of spiral leaf springs are arranged in the circumferential direction is fixedly supported at the circumferential end of the case 3-3. -6. The plate 3-9 and the magnet 3-8 are fixed to the center of the yoke 3-7.

Further, the coil 3-5 is inserted into a magnetic gap formed by the inner peripheral surface of the yoke 3-7 and the outer peripheral surfaces of the plate 3-9 and the magnet 3-8.
-3, and is fixed to a plurality of or more support plates 3-3a fixed or fixed. By applying an electric signal to the coil 3-5, the coil 3-5, the spring 3-6
, Yoke 3-7, plate 3-9 and magnet 3-8
Vibrates the mechanical vibration system consisting of

In this embodiment, by using the magnetic circuit section, a structure having both an electric-magnetic circuit section of a mechanical vibration system and an electric-magnetic circuit section of an acoustic sounding system is provided.
The coil 3-5 uses a frequency of about 130 Hz, which is said to be the most sensible to the user, and a predetermined drive voltage as an electric signal.
To the spring 3-6 and the yoke 3-
7, the plate 3-9 and the magnet 3-8 perform mechanical vibration, and the case 3-3 vibrates.

This vibration is transmitted to a portable telephone device having a built-in electromagnetic conversion device, and the portable telephone vibrates. It goes without saying that when the frequency of the electric signal applied to the coil 3-5 matches the resonance frequency of the mechanical vibration system, the vibration of the mechanical vibration system becomes maximum.

The sound generating system includes a diaphragm 3-10 and a coil 3
-10b, a yoke 3-7, a plate 3-9 and a magnet 3-8. The function of the acoustic pronunciation system is as described in the first embodiment. Also in this embodiment, two different electric signal circuits can apply an input of any electric signal necessary for each predetermined function, and can arbitrarily control mechanical vibration or sound generation. .

[0035]

According to the present invention, the vibration force can be increased by increasing the mass of the mechanical vibration system fixed to one spring, and the necessary and arbitrary vibration force can be set freely. Can be.

Further, according to the present invention, mechanical vibration and sound generation can be performed simultaneously by providing two systems of electric signal input for vibration and sound generation and having an independent circuit configuration. In particular, the acoustic sound output is independent of the electric signal input section and the acoustic sound output section, and is not modulated or output as a noise sound by the electric signal for obtaining the vibration, so that the user does not feel discomfort. . Of course, it is possible to perform advanced sound pronunciation such as a simple tone ringtone, a chord tone ringtone, music distribution, and the like.

Further, according to the present invention, in order to perform the four functions of receiving, calling, vibrating, and loudspeaker, the electric signal input for vibration and sound generation is made into two systems and the independent circuit configuration is adopted. Unlike the electromagnetic conversion device having one circuit configuration, the risk factor is reduced.

[Brief description of the drawings]

FIG. 1 is an external view of an electromagnetic conversion device according to a first embodiment of the present invention.

FIG. 2 is a sectional view of the same.

FIG. 3 is a sectional view of an electromagnetic conversion device according to a second embodiment of the present invention.

FIG. 4 is an external view of an electromagnetic conversion device according to a conventional example.

FIG. 5 is a sectional view taken along line AA of FIG. 4;

[Explanation of symbols]

 2 Electromagnetic converter 2-1 Cover 2-1a Air hole 2-2a Input terminal 2-2b Input terminal 2-3 Case 2-4 Bottom plate 2-5 Coil 2-6 Spring 2-7 Yoke 2-8 Magnet 2 -9 Plate 2-10 Diaphragm 2-10a Outer edge 2-10b Coil 2-11 Yoke 2-12 Magnet 2-13 Plate 3 Electromagnetic converter 3-1 Cover 3-1a Air hole 3-2a Input terminal 3 2b Input terminal 3-3 Case 3-3a Bottom plate 3-5 Coil 3-6 Spring 3-7 Yoke 3-8 Magnet 3-9 Plate 3-10 Vibration plate 3-10b Coil

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Seiichi Tanaka 1 Kitano, Makino, Mizusawa-shi, Iwate F-term in Hitachi Media Electronics Co., Ltd. 5D107 AA13 AA16 BB08 CC08 CC10 FF05 FF07 FF10 5H633 BB09 BB10 GG03 GG06 GG09 GG17 HH02 JA03

Claims (3)

[Claims] A magnetic circuit portion of a mechanical vibration system and a magnetic circuit portion of an acoustic sound generation system are independently fixed to and supported by a central portion of one spring, and an electric signal for generating vibration and sound is provided. An electromagnetic conversion device having two independent inputs. 2. The electromagnetic conversion device according to claim 1, wherein
An electromagnetic transducer, wherein the diaphragm and the outer edge of the diaphragm of the sound-producing system are fixed to a part of a yoke. 3. A magnetic circuit part of a mechanical vibration system and a magnetic circuit part of an acoustic sound generation system are shared and fixedly supported at the center of one spring, and electric signal inputs for vibration and sound generation are independently provided. An electromagnetic conversion device comprising two systems.