JP2006020012A - Electroacoustic transducer and electronic equipment using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an excellent electroacoustic transducer for preventing reduction of a spring pressure of a terminal so as to realize stable signal supply to a speaker and to provide electronic equipment employing the same. <P>SOLUTION: Since a stopper 29a receives an impact force at nearly its right-angled shape by configuring the stopper 29a of the terminal 30 in a controllable way of a folding range of the terminal 30 through the extension of at least part of the end of a protector 29, the stopper 29a has a strong shock immunity so as to strengthen the stopper 29a against an external force so that the terminal is configured to maintain a strong spring pressure at all times without exceeding a reversible limit to the spring pressure of the metallic terminal of the terminal. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an electroacoustic transducer used for various acoustic devices and information communication devices, and electronic devices such as mobile phones and game devices.

  Prior art will be described with reference to FIGS. 7 to 9 are sectional views of conventional electroacoustic transducers, which are used as speakers and receivers mounted on electronic devices such as mobile phones. 10 to 11 are cross-sectional views of the electroacoustic transducer mounted on an electronic device such as a mobile phone.

  As shown in FIG. 7, a magnetized magnet 1 is sandwiched between an upper plate 2 and a yoke 3 to constitute an internal magnet type magnetic circuit 4. The magnetic circuit 4 is press-fitted into a resin frame 6 in which a part of the terminal 10 is molded while the yoke 3 of the magnetic circuit 4 is in contact, and bonded together by adhesion.

  Then, a diaphragm 7 is bonded to the peripheral portion of the frame 6, a voice coil 8 for driving the diaphragm 7 is coupled to the diaphragm 7, and the voice coil 8 is coupled so as to fit into the magnetic gap 5. Yes. Thereafter, the lead wire of the voice coil 8 is soldered to one end of the terminal 10 and joined. Finally, the other end is configured as a power supply terminal to the system side so that the terminal 10 does not protrude from the outer dimensions of the frame 6 by folding the substantially central portion of the terminal 10 in half. is doing.

  Here, the terminal 10 is configured to bend a single sheet-like metal plate having conductivity and make contact with the power feeding unit using the spring pressure of the metal plate. And, in the range where the bending of the metal plate does not exceed the reversible limit value of the metal material, the final end of the sheet-like metal plate of the terminal 10 is bent inward to constitute the stopper 9, thereby reducing the bending range. I have control.

  8 and 9 are cross-sectional views showing the state of the terminal 10 shown in FIG. 7. Assuming that the state of the terminal 10 shown in FIG. 7 is a top dead center, FIG. It has been reached. FIG. 9 shows a state in which an excessive force is applied from the state where the terminal 10 in FIG.

  10 to 11 are cross-sectional views in a state where the above-described electroacoustic transducer is mounted on an electronic device such as a mobile phone. FIG. 10 shows that the terminal 10 is bent to some extent and an appropriate spring is applied to the power supply unit on the set side. This is a state showing a state where pressure is applied. In FIG. 11, due to external factors such as a drop impact of the mobile phone, the terminal 10 is pushed and deformed by the power supply unit on the set side, and after reaching the bottom dead center, an excessive force is further applied and the stopper 9 is deformed. It is in a crushed state. In this case, the stopper 9 is deformed beyond the reversible limit value of the metal material, and once it receives an impact, it does not return to its original state even if the applied pressure is lost.

For example, Patent Document 1 is known as prior art document information relating to the invention of this application.
JP 2003-37890 A

  The above-described electroacoustic transducer is strongly required by the market to improve the reliability of electronic devices such as mobile phones that are in the set. Therefore, in order to improve the reliability of these electronic devices, it is essential to improve the reliability of the electroacoustic transducers mounted on the electronic devices.

  Based on the above background, conventional problems will be described. A conventional speaker or receiver, which is this type of electroacoustic transducer, generates a spring pressure of a metal terminal of the terminal 10 and is coupled to a power supply unit on the system side by contact.

  However, when these loudspeakers are attached to a set, if the loudspeaker pressing size is set large, the stopper 9 of the terminal 10 may be deformed, and the reversible limit value of the spring pressure of the metal terminal of the terminal 10 may be exceeded. .

  Furthermore, if these electronic devices such as mobile phones are accidentally dropped, the stopper 9 of the terminal 10 is crushed by an excessive impact force, and the reversible limit value of the spring pressure of the metal terminal of the terminal 10 is exceeded. Sometimes. This is because the stopper 9 is also made of the same metal terminal and has a spring pressure, but this stopper 9 also exceeds the reversible limit value of the spring pressure, thereby causing permanent deformation. .

  In this case, since the spring pressure of the terminal 10 and the stopper 9 is reduced, the contact coupling with the set power feeding part becomes unstable, and a contact failure occurs when the set is shocked or vibrated. The problem was that the signal was interrupted.

  The above-described problem is a problem that occurs not only in the type in which the stopper 9 is formed on the terminal 10, but also in the type in which the stopper is integrally molded with resin at the time of injection molding of the resin frame. This type occurs when the resin stopper is destroyed by an impact and exceeds the reversible limit value of the spring pressure of the metal terminal of the terminal.

  For the above reasons, it has been a problem to make the spring pressure of the terminal 10 not decrease so that the signal from the speaker will not be interrupted even if the set is shocked or vibrated.

  The present invention solves the above-described problems, and provides an excellent electroacoustic transducer capable of realizing a stable signal supply to a speaker by preventing a decrease in spring pressure of a terminal and an electronic device using the same. It is.

  In order to achieve the above-mentioned object, the present invention aims at strengthening the stopper so that the bending of the terminal does not exceed the reversible limit value of the metal material. In other words, the terminal stopper is not formed from a material that is weak against pressure deformation and impact force, such as bending the sheet metal plate that is the terminal, or resin, but impact force The material is made of a material strong against the impact force.

  This stopper is configured to extend at least a part of the end portion of the protector as a stopper, and to adjust the height of the stopper to control the bending range of the terminal. With this configuration, the stopper receives a force in a substantially right-angle shape with respect to pressure deformation and impact force, and thus has a strong resistance against deformation and a strong impact resistance. Therefore, the function of the terminal can be fulfilled without causing deformation or destruction of the stopper itself.

  For this reason, when the speaker is attached to an electronic device such as a mobile phone, the stopper does not move even if an excessive impact force is applied to the terminal by setting the speaker pressing size large or accidentally dropping the electronic device such as a mobile phone. The terminal is not deformed or crushed, does not exceed the reversible limit value of the spring pressure of the metal terminal as a terminal, and the spring pressure of the terminal does not decrease.

  For this reason, the terminal can maintain a strong spring pressure at all times, the contact coupling with the set power supply unit is stabilized, and there is no contact failure even when the set is shocked or vibrated. Stabilizes the signal without interruption. Therefore, it is possible to improve the reliability of electronic devices such as mobile phones.

  The protector described above is often used in this type of electroacoustic transducer, and protects vibration components from external impacts of electroacoustic transducers used in electronic devices such as mobile phones. It is a part provided for.

  As described above, in the present invention, the terminal bending range is controlled by forming the terminal stopper by extending at least a part of the terminal end of the protector. With this configuration, the stopper receives a force in a substantially right-angle shape with respect to pressure deformation and impact force, and thus has a strong resistance against deformation and a strong impact resistance. Therefore, since the function can be fulfilled without deforming or destroying the stopper itself against the deformation of the terminal, the terminal does not exceed the reversible limit value of the spring pressure of the metal terminal of the terminal. A strong spring pressure can be maintained at all times, and the contact coupling with the power supply unit of the electronic device is stabilized, and even when the electronic device is shocked or vibrated, no contact failure occurs, Stabilize without interruption. Therefore, it is possible to improve the reliability and quality of electronic devices such as mobile phones.

  Furthermore, because the protector is configured by substituting its role, there is no need to add a separate part, and the number of parts can be reduced, thereby reducing costs. it can.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
Hereinafter, the first to third aspects of the present invention will be described with reference to the first embodiment. FIGS. 1 to 3 show a speaker which is an electroacoustic transducer according to an embodiment of the present invention, and shows an example in which the external shape is applied to a rectangular type slim speaker.

  FIG. 1 is a cross-sectional view of an electroacoustic transducer according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view of a state in which the terminal in FIG. 1 has reached bottom dead center due to protection of a stopper. FIG. 3 is a perspective view of the speaker in FIG.

  As shown in FIGS. 1 to 3, the magnetized magnet 21 is sandwiched between an upper plate 22 and a yoke 23 to form an inner magnet type magnetic circuit 24. The magnetic circuit 24 is press-fitted into a resin frame 26 in which a part of the terminal 30 is molded while the yoke 23 of the magnetic circuit 24 is in contact with the magnetic circuit 24 and bonded together by adhesion.

  Then, a diaphragm 27 is bonded to the peripheral portion of the frame 26, a voice coil 28 for driving the diaphragm 27 is coupled to the diaphragm 27, and the voice coil 28 is coupled so as to fit into the magnetic gap 25. Yes. On the other hand, a protector 29 is coupled to the frame 26 so as to cover the front surface of the diaphragm 27.

  Then, the lead wire of the voice coil 28 is soldered to one end portion of the terminal 30 and joined. Finally, the other end is configured as a power supply terminal to the system side so that the terminal 30 does not protrude to the outside due to the outer dimensions of the frame 26 by folding the substantially central portion of the terminal 30 in half. is doing.

  Here, the protector 29 extends a part of the end portion of the protector 29 in order to substitute the role of the stopper 29a in the range where the bending of the metal plate of the terminal 30 does not exceed the reversible limit value of the metal material. In addition, the height of the stopper 29a is adjusted to control the bending range of the terminal 30.

  The shape of the protector 29 is formed so as to cover the diaphragm 26. When the speaker is attached to an electronic device such as a mobile phone, which is the original purpose, the protector 29 is protected from an external impact. It is possible to protect the vibration parts of the electroacoustic transducer. Further, the terminal 30 can be protected by adjusting the height of the stopper 29 a of the protector 29 as a stopper for controlling the bending range of the terminal 30. Therefore, both the original purpose and the effect as the stopper 29a of the terminal 30 can be exhibited, and its value is high.

  In particular, the effect of the stopper 29a is formed by extending a part of the end portion of the protector 29, so that the external impact force from an electronic circuit which is a power feeding portion of an electronic device such as a mobile phone is reduced. Thus, the impact resistance is improved because the force is applied to the substantially right-angled shape. Therefore, by sharing the original purpose, it is possible to reduce the number of parts, thereby realizing a reduction in cost.

  In this embodiment, the inner magnet type magnetic circuit 24 has been described. However, the present invention is not limited to this and may be applied to an electroacoustic transducer having an outer magnet type magnetic circuit.

  The protector 29 is preferably made of a polymer material. This is because an excessive force due to a drop impact or the like is absorbed, the speaker is protected, and a large restoring force is provided so that it can withstand a large number of drop impacts and the like.

  With this configuration, when the speaker is attached to an electronic device such as a mobile phone, the terminal 30 is bent to some extent, and an electronic circuit that is a power feeding unit on the electronic device side such as a mobile phone is maintained in an appropriate spring pressure state. Is done. Even if the speaker is pressed firmly and attached, the stopper 29a hits and the terminal 30 does not move any further. In addition, even if an electronic device such as a mobile phone is accidentally dropped and an excessive impact force is applied to the terminal 30, deformation exceeding the reversible limit value of the metal material may occur or be crushed by the effect of the stopper 29a. Disappears.

  Therefore, the reversible limit value of the spring pressure of the metal terminal of the terminal 30 is not exceeded, the spring pressure of the terminal 30 is not reduced, and the terminal 30 can always maintain a strong spring pressure. The contact coupling with the power supply unit of the electronic device is stabilized, and even when the electronic device is shocked or vibrated, no contact failure occurs, so that the signal is stabilized without interruption.

  As another embodiment, the protector 29 is preferably made of a metal material. The reason for this is that, even if an excessive force due to a drop impact is applied, it can withstand a large number of drop impacts without being broken or damaged, and it has environmental resistance such as thermal shock resistance and chemical resistance. It is because it is excellent in.

  Further, it is desirable that the stopper 29a of the protector 29 is provided with a reinforcing rib 29b. The reason for this is that even if an excessive force due to a drop impact or the like is applied, the impact resistance is further improved by the effect of the reinforcing rib 29b, and the reversible limit value of the spring pressure of the metal terminal of the terminal 30 is not exceeded. This is because the terminal 30 can be reliably protected. For the above reasons, the reliability of electronic devices such as mobile phones can be improved.

(Embodiment 2)
The second aspect of the present invention will be described below with reference to the second embodiment. FIG. 4 shows a cross-sectional view of a speaker according to an embodiment of the present invention. Only differences from the first embodiment will be described.

  As shown in FIG. 4, an insulator 29 c is formed on the stopper 29 a of the protector 29. With this configuration, even if the stopper 29a of the protector 29 made of a metal material comes into contact with an electronic circuit that is a power feeding unit of the electronic device due to an impact force, the safety can be further improved without causing a short circuit. Therefore, it is possible to further improve the reliability and safety of electronic devices such as mobile phones.

(Embodiment 3)
The third aspect of the present invention will be described below with reference to the third embodiment. 5 and 6 are cross-sectional views of the main part of a mobile phone which is an electronic apparatus according to an embodiment of the present invention. As shown in FIGS. 5 and 6, a cellular phone 80 is configured by mounting the speaker 35 according to any one of claims 1 to 5.

  As shown in FIG. 5, the cellular phone 80 includes a speaker 35, an electronic circuit 40, a display module 60 such as a liquid crystal display module 60, and the like mounted in an exterior case 70. It constitutes the main part. The speaker 35 is operated by supplying contact power to the terminal 30 of the speaker 35 and the electronic circuit 40 while applying spring pressure.

  With this configuration, when the speaker 35 as shown in FIG. 6 is attached to the mobile phone 80, the pressing size of the speaker 35 is set large, or the mobile phone 80 is accidentally dropped to cause an excessive impact force on the terminal 30. Even if the terminal 30 is added, the terminal 30 is not permanently deformed or crushed by the effect of the stopper 29a. Therefore, the reversible limit value of the spring pressure of the metal terminal of the terminal 30 is not exceeded, and the spring pressure of the terminal 30 is not reduced.

  For this reason, the terminal 30 can always maintain a strong spring pressure, the contact coupling with the power feeding part of the electronic circuit 40 of the mobile phone 80 is stabilized, and even when the mobile phone 80 is shocked or vibrated, Since no contact failure occurs, the signal can be stabilized without being interrupted. Therefore, the reliability and quality of electronic devices such as mobile phones can be improved.

  The electroacoustic transducer and the electronic device according to the present invention can be applied to an electronic device such as an audiovisual device, an information communication device, and a game device that require improvement in reliability and quality.

Sectional drawing of the speaker in one embodiment of this invention Sectional drawing of the speaker in one embodiment of this invention Sectional drawing of the speaker in one embodiment of this invention Sectional drawing of the speaker in one embodiment of this invention Sectional drawing of the principal part of the electronic device in one embodiment of this invention Sectional drawing of the principal part of the electronic device in one embodiment of this invention Cross-sectional view of a conventional speaker Cross-sectional view of a conventional speaker Cross-sectional view of a conventional speaker Sectional view of the main parts of a conventional electronic device Sectional view of the main parts of a conventional electronic device

Explanation of symbols

21 Magnet 22 Upper plate 23 Yoke 24 Magnetic circuit 25 Magnetic gap 26 Frame 27 Diaphragm 28 Voice coil 29 Protector 29a Stopper 29b Reinforcement rib 29c Insulator 30 Terminal 35 Speaker 40 Electronic circuit 60 Display module 70 Exterior case 80 Mobile phone

Claims (6)

A frame coupled to the magnetic circuit; a diaphragm coupled to the outer periphery of the frame; a voice coil coupled to the diaphragm and a part of which is disposed in the magnetic gap of the magnetic circuit; A sheet metal plate having conductivity, which is connected to the lead wire of the voice coil, is bent, and a terminal that makes contact with the power feeding unit using the spring pressure of the metal plate, and a front surface of the diaphragm are connected to each other. An electroacoustic transducer comprising a protector coupled to the frame so as to cover the end of the protector so that the bending range can be controlled within a range in which the bending of the terminal does not exceed the reversible limit value of the metal material. An electroacoustic transducer in which at least a part of the portion is extended to form a stopper for the terminal. The electroacoustic transducer according to claim 1, wherein the protector is made of a polymer material. The electroacoustic transducer according to claim 1, wherein the protector is made of a metal material. The electroacoustic transducer according to claim 3, wherein an insulator is provided at a terminal portion of the protector. The electroacoustic transducer according to any one of claims 1 to 4, wherein the protector is provided with a reinforcing rib. An electronic device equipped with the electroacoustic transducer according to any one of claims 1 to 5.

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