JP2005295366A - Speaker, module using the same, and electronic equipment using the module - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To increase sound pressure as a speaker by effectively utilizing magnetic flux that a magnet has. <P>SOLUTION: There are provided a first magnetic circuit 24 comprising a yoke 23 having a recess, a first magnet 21 provided at the recess, and a first upper plate 22 that is provided on the surface of the first magnet 21 and has a projection; and a second magnetic circuit 34 comprising a second magnet 31 provided on the surface of the first upper plate 22 so that the periphery surface of the projection on the first upper plate 22 is surrounded, and a second upper plate 32 provided on the surface of the second magnet 31. The first and second magnets 21, 31 are arranged so that they repel each other. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a speaker, a module using the speaker, and an electronic apparatus using the speaker.

  FIG. 10 shows a cross-sectional view of a conventional speaker. This speaker is generally called a composite speaker.

  That is, the center pole 4 of the lower plate 3 constituting the first magnetic circuit 2 of the first speaker 1 and the bottom surface of the lower plate 7 constituting the second magnetic circuit 6 of the second speaker 5. Are connected via the supporter 8. Since the first speaker 1 and the second speaker 5 are independent as a speaker unit, the first and second magnetic circuits 2 and 6 are also independent.

  The first and second magnetic circuits 2 and 6 are provided with first and second magnetic gaps 9 and 10, respectively, and the first and second magnetic gaps 9 and 10 are movable. Are applied to the first and second voice coils 11 and 12 to excite the first and second voice coils 11 and 12, and the excitation force thereof is the first and second. Are transmitted to the first and second diaphragms 13 and 14 coupled to the voice coils 11 and 12, respectively. These first and second diaphragms 13 and 14 are configured to convert electric signals into sound by vibrating air.

In addition, as prior art document information relevant to the invention of this application, for example, Patent Document 1 is cited.
JP-A-7-264694

  At this time, if all of the magnetic flux of the magnet provided in the magnetic circuit is concentrated in the magnetic gap, it is possible to obtain the excitation force for the electrical signal without loss, but in the actual magnetic circuit there is leakage magnetic flux, In terms of conversion to sound, the magnetic flux of the magnet could not be used effectively.

  Therefore, an object of the present invention is to improve sound pressure as a speaker by effectively using the magnetic flux.

  In order to achieve this object, the invention according to claim 1 of the present invention includes a yoke having a concave portion, a first magnet provided in the concave portion, and a convex portion provided on the surface of the first magnet. A first magnetic circuit comprising a first upper plate, a second magnet provided on a surface of the first upper plate so as to surround a peripheral surface of a convex portion of the first upper plate, and A second magnetic circuit comprising a second upper plate provided on the surface of the second magnet, and the first magnet and the second magnet are arranged so as to repel each other. As a result, the magnetic flux in the magnetic gap between the yoke and the first upper plate is increased, and as a result, the sound pressure of the speaker having the first magnetic circuit can be improved.

  In addition, since the first upper plate also functions as a yoke of the second magnetic circuit, the first upper plate can be reduced in size compared to the case of using a supporter or simply arranging two magnetic circuits on the same axis. There is an effect.

  The second aspect of the present invention is such that, in particular, a third magnet is provided on the surface of the second upper plate, and the second magnet and the third magnet are arranged so as to repel each other. The magnetic flux in the magnetic gap between the upper plate and the first upper plate is increased. As a result, the sound pressure of the speaker having the second magnetic circuit can be improved.

  In the invention according to claim 3, in particular, the vibration component is configured only in one of the first magnetic circuit and the second magnetic circuit, so that only one of the magnetic circuits is an active speaker. There is an effect of being able to.

  The invention described in claim 4 is characterized in that, in particular, the outer dimension of the second magnet is smaller than the outer dimension of the yoke, and leakage magnetism as a composite speaker can be reduced. That is, since the yoke has a shielding effect with respect to the second magnet, there is an effect that the leakage flux as a whole can be reduced.

  The invention according to claim 5 is characterized in that, in particular, the volume of the first magnet is larger than the volume of the second magnet, and the absolute value of the amount of magnetic flux is equivalent to the larger volume of the first magnet. Since the magnetic flux can be concentrated on the magnetic gap of the first magnetic circuit, the sound pressure of the speaker having the first magnetic circuit can be improved.

  The invention described in claim 6 is characterized in that, in particular, the frequency of the electric signal converted by the first magnetic circuit is lower than the frequency of the electric signal converted by the second magnetic circuit. Thus, there is an effect that a 2-way speaker can be realized.

  A seventh aspect of the present invention is a module having the speaker according to any one of the first to sixth aspects and an electronic circuit, and thus a module having a speaker in which two magnetic circuits are arranged on the same axis. There exists an effect that it can reduce in size compared with.

  Invention of Claim 8 is an electronic device which has a speaker as described in any one of Claims 1-6, and there exists an effect similar to Claim 7.

  The invention according to a ninth aspect is an apparatus on which the speaker according to any one of the first to sixth aspects is mounted, and has the same effects as the seventh aspect.

  According to a tenth aspect of the present invention, there is provided a first comprising a yoke having a recess, a first magnet provided in the recess, and a first upper plate having a recess provided on the surface of the first magnet. And a second magnetic circuit comprising a second magnet provided in the recess of the first upper plate, and a second upper plate provided on the surface of the second magnet, The first magnet and the second magnet are arranged so as to repel each other, so that the same effect as in the first aspect can be obtained even when the first and second magnetic circuits are each of the internal magnet type. .

  In the invention described in claim 11, in particular, a third magnet is provided on the surface of the second upper plate, and the second magnet and the third magnet are arranged so as to repel each other. The magnetic flux in the magnetic gap between the upper plate and the first upper plate is increased. As a result, the sound pressure of the speaker having the second magnetic circuit can be improved.

  In the invention described in claim 12, in particular, the vibration component is configured only in one of the first magnetic circuit and the second magnetic circuit, whereby only one of the magnetic circuits is used as an active speaker. There is an effect of being able to.

  The invention described in claim 13 is characterized in that, in particular, the outer dimension of the second magnet is smaller than the outer dimension of the yoke, and leakage magnetism as a composite speaker can be reduced. That is, since the yoke has a shielding effect with respect to the second magnet, there is an effect that the leakage flux as a whole can be reduced.

  The invention described in claim 14 is characterized in that, in particular, the volume of the first magnet is larger than the volume of the second magnet, and the absolute value of the amount of magnetic flux is equal to the larger volume of the first magnet. Since the magnetic flux can be concentrated on the magnetic gap of the first magnetic circuit, the sound pressure of the speaker having the first magnetic circuit can be improved.

  The invention described in claim 15 is characterized in that, in particular, the frequency of the electric signal converted by the first magnetic circuit is lower than the frequency of the electric signal converted by the second magnetic circuit. Thus, there is an effect that a 2-way speaker can be realized.

  A sixteenth aspect of the present invention is a module having the speaker according to any one of the tenth to fifteenth aspects and an electronic circuit, and thus a module having a speaker in which two magnetic circuits are arranged on the same axis. There exists an effect that it can reduce in size compared with.

  The invention according to claim 17 is an electronic apparatus having the speaker according to any one of claims 10 to 15, and has the same effect as that of claim 16.

  The invention described in claim 18 is an apparatus on which the speaker according to any one of claims 10 to 15 is mounted, and has the same effect as that of the sixteenth aspect.

  The present invention provides a first magnetic circuit comprising a yoke having a concave portion, a first magnet provided in the concave portion, and a first upper plate having a convex portion provided on the surface of the first magnet. A second magnet provided on the surface of the first upper plate so as to surround a peripheral surface of the convex portion of the first upper plate, and a second upper plate provided on the surface of the second magnet, And the first magnet and the second magnet are arranged so as to repel each other, whereby the magnet between the yoke and the first upper plate is arranged. The magnetic flux in the gap increases, and as a result, the sound pressure of the speaker having the first magnetic circuit can be improved.

  In addition, since the first upper plate also functions as a yoke of the second magnetic circuit, the first upper plate can be reduced in size compared to the case of using a supporter or simply arranging two magnetic circuits on the same axis. There is an effect.

  Hereinafter, a speaker of the present invention, a module using the speaker, and an electronic apparatus using the speaker will be described with reference to embodiments and drawings. In addition, about the same content, the description is abbreviate | omitted and demonstrated.

(Embodiment 1)
In the following, the present invention, in particular, the first, fourth, and fifth aspects of the present invention will be described with reference to the first embodiment and FIG.

  FIG. 1 is a cross-sectional view of the speaker according to the first embodiment.

  According to FIG. 1, a magnetized first magnet 21 is coupled to a yoke 23 and a first upper plate 22 to form a first magnetic circuit 24. A second magnetic circuit 34 is formed by coupling a second magnet 31 and a second upper plate 32 to the first upper plate 22 of the first magnetic circuit 24.

  Here, the first magnet 21 and the second magnet 31 are magnetized in directions that repel each other, and the outer dimensions of each of the first magnet 21 and the second magnet 31 are smaller than the outer dimensions of the yoke 23 and are provided inside the yoke 23. The volume of the first magnet 21 is configured to be larger than the volume of the second magnet 31.

  A first frame 26 is coupled to the outer peripheral surface of the yoke 23 of the first magnetic circuit 24, and a first diaphragm 27 is coupled to the peripheral portion of the first frame 26. Then, the first voice coil 28 is coupled to the first diaphragm 27, and the first voice coil 28 is held at the center by the damper 29, and the magnetic gap 25 of the first magnetic circuit 24 is maintained. The speaker is configured to be movable.

  With the above configuration, the first magnetic circuit 24 and the second magnetic circuit 34 constitute a magnetic circuit having a magnetic gap, respectively, and the first and second magnets 21 and 31 repel each other. Therefore, the magnetic flux density of the magnetic gap of each magnetic circuit can be improved, and as a result, the sound pressure level of the speaker can be improved. Further, it is possible to reduce the leakage magnetic flux of the speaker while maintaining high reliability.

  Furthermore, to achieve a stable magnetic circuit that is unlikely to generate low-temperature demagnetization or high-temperature demagnetization even when using magnet materials that were previously considered to be vulnerable to thermal environmental impacts such as low and high temperatures and heat shock. Can do.

  Further, the first magnetic circuit 24 is an internal magnet type, and the first upper plate 22 is used as a yoke of the second magnetic circuit 34, thereby reducing the thickness and weight of the speaker. You can also.

  Further, the second magnetic circuit 34 of the first embodiment is not a state in which a vibration component is coupled to this to constitute a speaker, but only a magnetic circuit. However, the second magnetic circuit 34 includes a voice coil, When a speaker is configured by providing a diaphragm or the like, a supporter is unnecessary, and the speaker can be made thinner, lighter, and lower in cost.

  Further, as in the invention described in claim 4 of the present invention, the outer dimensions of the first magnet 21 and the second magnet 31 are configured to be smaller than the outer dimensions of the yoke 23, respectively. Further low magnetic flux leakage can be realized.

  Further, as in the invention described in claim 5 of the present invention, the volume of the magnet constituting the magnetic circuit of the speaker is configured such that the volume of the first magnet 21 is larger than the volume of the second magnet 31. And it can be set as the structure with a sufficient balance of leakage magnetic flux and magnetic flux density. In other words, it is possible to realize an efficient magnetic circuit in which a larger magnetic flux density can be obtained with a smaller magnet volume in order to reduce the leakage magnetic flux.

(Embodiment 2)
Hereinafter, the invention according to the sixth aspect of the present invention will be described with reference to the second embodiment and FIG.

  FIG. 2 is a cross-sectional view of the speaker according to the second embodiment.

  The difference from the first embodiment is that a second speaker is configured by coupling a vibration component to the second magnetic circuit 34.

  That is, the second frame 36 is coupled to the second upper plate 32 of the second magnetic circuit 34, and the second diaphragm 37 is coupled to the peripheral portion of the second frame 36. Then, the second voice coil 38 is coupled to the second diaphragm 37, and the second voice coil 38 is inserted into the magnetic gap 35 of the second magnetic circuit 34 to constitute a second speaker. Is.

  Further, in this case, the dust cap 30 of the first speaker constituted by the first magnetic circuit 24, the first voice coil 28, the first diaphragm 27 and the like is the sound of the second speaker inside. Is made of a breathable material so that can be released to the outside.

  With this configuration, a composite speaker in which two speakers are combined can be realized.

  Further, as in the invention described in claim 6 of the present invention, the first speaker is configured by inputting a signal having a frequency component lower than that of the second voice coil 38 to the first voice coil 28. It is possible to realize a two-way speaker that uses the low sound and the second speaker for high sound.

(Embodiment 3)
The invention according to claim 2 will be described in particular with reference to the third embodiment and FIG.

  FIG. 3 is a cross-sectional view of the speaker according to the third embodiment.

  The difference from the second embodiment is that a third magnet 39 is provided on the surface of the second upper plate 32, and the third magnet 39 and the second magnet 31 are arranged so as to repel each other. is there. By providing the third magnet 39 in this way, the magnetic flux of the magnetic gap 35 of the second magnetic circuit 34 is increased, and the sound pressure of the speaker having the second magnetic circuit 34 can be improved.

  Therefore, when the composite type speaker or the two-way type speaker shown in Embodiment 2 is manufactured with the above-described magnetic circuit configuration, the sound pressure of the first and second speakers can be improved and powerful. You can enjoy the sound.

(Embodiment 4)
Hereinafter, the invention according to the third aspect of the present invention will be described with reference to the fourth embodiment and FIG.

  FIG. 4 shows a cross-sectional view of the speaker according to the fourth embodiment.

  The fourth embodiment is different from the second embodiment in that a speaker is configured by providing all the vibration components only in one of the first magnetic circuit 24 and the second magnetic circuit 34. It is.

  That is, the speaker shown in FIG. 4 is a so-called second speaker in which the second magnetic circuit 34 is provided with all the vibration components, and the first speaker has a voice coil only in the bobbin 28a. It is a passive radiator.

  With this configuration, it is possible to configure a passive radiator system in which only one speaker is active.

  Of course, this configuration may be the reverse of the above configuration. That is, the first speaker can include all the vibration components to configure the speaker, and the second speaker can be configured as a passive radiator.

(Embodiment 5)
Hereinafter, the invention according to the seventh aspect of the present invention will be described with reference to the fifth embodiment and FIG.

  FIG. 5 is a cross-sectional view of the speaker module according to the fifth embodiment.

  A speaker module 44 according to the fifth embodiment includes the speaker 40 according to any one of claims 1 to 6 and an electronic circuit 43 in which an electronic component 46 is mounted on a circuit board 45. .

  With the above configuration, integrating the speaker 40 and the electronic circuit 43 enables production integration, distribution integration, reduction of management items, and the like. As a result, it is possible to reduce the amount of electronic equipment and devices using the speaker 40. Cost can be reduced.

  Furthermore, adverse effects on magnetically weak parts such as cathode ray tubes used in televisions can be reduced.

(Embodiment 6)
Hereinafter, with reference to the sixth embodiment and FIG. 6, the invention according to the eighth aspect of the present invention will be described.

  FIG. 6 is a cross-sectional view of a main part of the electronic device according to the sixth embodiment.

  In the sixth embodiment, a cellular phone equipped with the speaker according to any one of claims 1 to 6 is configured.

  That is, a speaker 40, an electronic circuit 43, and a display unit 47 such as a liquid crystal are mounted on an outer case 48 to constitute a mobile phone 49 that is an electronic device.

  With this configuration, it is possible to achieve high reliability, thinning, weight reduction, and cost reduction of a mobile phone that is an electronic device.

  Furthermore, the functions of the speaker and the receiver necessary for the mobile phone are configured to correspond to each of the composite speakers of the present invention, so that, for example, the first speaker is used as the speaker and the second speaker is used as the receiver. Thus, it is possible to obtain a mobile phone with high productivity and cost performance and with little leakage magnetic flux.

  Therefore, the risk of data loss or the like can be reduced even if the magnetic tape, various magnetic cards, magnetic storage media, etc., which are magnetically weak, are brought close to the mobile phone.

  Further, the influence of the human body can be reduced by the DC magnetic field generated from the magnet of the speaker.

(Embodiment 7)
Hereinafter, the invention according to the ninth aspect of the present invention will be described with reference to the seventh embodiment and FIG.

  FIG. 7 is a cross-sectional view of the apparatus according to the seventh embodiment.

  In the seventh embodiment, an automobile equipped with the speaker according to any one of claims 1 to 6 is configured.

  That is, the speaker 40 is mounted on the rear tray of the automobile 50.

  With this configuration, it is possible to reduce the size, weight, and cost of the automobile 50 as an apparatus. In particular, the downsizing can reduce environmental loads such as fuel saving of the automobile 50.

  In addition, adverse effects on magnetically weak electronic devices and devices such as navigation systems and cathode ray tubes mounted on the automobile 50 can be reduced.

(Embodiment 8)
The invention according to claims 10 to 18 will be described in particular with reference to the eighth embodiment and FIGS.

  8 and 9 are cross-sectional views of the speaker according to the eighth embodiment.

  The speaker of the eighth embodiment is different from that of the first embodiment in that the second magnetic circuit 41 is made an internal magnet type using the first upper plate 33 having a recess.

  Other than that, the present invention is the same as that of the first aspect of the invention, and when the third magnet 42 is provided as shown in FIG. 9, the third magnet 42 is provided on the surface of the second upper plate 32. That's fine.

  As described above, even if the second magnetic circuit 41 is an internal magnet type, the embodiments described in the first to seventh embodiments can be implemented, and the same effects can be achieved.

  The speaker of the present invention has the effect of improving sound pressure and the effect of being miniaturized, and is useful for various modules, various electronic devices, and the like.

Sectional drawing of the speaker in Embodiment 1 of this invention Sectional drawing of the speaker in Embodiment 2 of this invention Sectional drawing of the speaker in Embodiment 3 of this invention Sectional drawing of the speaker in Embodiment 4 of this invention Sectional drawing of the speaker module in Embodiment 5 of this invention Sectional drawing of the electronic device in Embodiment 6 of this invention Sectional drawing of the apparatus in Embodiment 7 of this invention Sectional drawing of the speaker in Embodiment 8 of this invention Sectional drawing of the speaker in Embodiment 8 of this invention Cross-sectional view of a conventional speaker

Explanation of symbols

DESCRIPTION OF SYMBOLS 21 1st magnet 22 1st upper plate 23 Yoke 24 1st magnetic circuit 25 1st magnetic gap 26 1st frame 27 1st diaphragm 28 1st voice coil 29 Damper 30 1st dust cap 31 2nd magnet 32 2nd upper plate 33 1st upper plate 34 2nd magnetic circuit 35 2nd magnetic gap 36 2nd frame 37 2nd diaphragm 38 2nd voice coil 39 3rd Magnet 40 Speaker 41 Second magnetic circuit 42 Third magnet 43 Electronic circuit 44 Speaker module 45 Circuit board 46 Electronic component 47 Display unit 48 Exterior case 49 Mobile phone 50 Automobile

Claims (18)

A first magnetic circuit comprising a yoke having a concave portion, a first magnet provided in the concave portion, and a first upper plate having a convex portion provided on a surface of the first magnet; A second magnet comprising a second magnet provided on the surface of the first upper plate so as to surround the peripheral surface of the convex portion of the upper plate, and a second upper plate provided on the surface of the second magnet. And a magnetic circuit, wherein the first magnet and the second magnet are arranged to repel each other. The speaker according to claim 1, wherein a third magnet is provided on a surface of the second upper plate, and the second magnet and the third magnet are arranged so as to repel each other. The speaker according to claim 1, wherein the vibration component is configured only in one of the first magnetic circuit and the second magnetic circuit. 2. The speaker according to claim 1, wherein the outer dimension of the second magnet is smaller than the outer dimension of the yoke. The speaker according to claim 1, wherein the volume of the first magnet is larger than the volume of the second magnet. A speaker, wherein a frequency of an electric signal converted by a first magnetic circuit is lower than a frequency of an electric signal converted by a second magnetic circuit. A module comprising the speaker according to any one of claims 1 to 6 and an electronic circuit. The electronic device which has a speaker as described in any one of Claims 1-6. The apparatus carrying the speaker as described in any one of Claims 1-6. A first magnetic circuit comprising a yoke having a recess, a first magnet provided in the recess, and a first upper plate having a recess provided on the surface of the first magnet; A second magnetic circuit comprising a second magnet provided in the recess of the upper plate and a second upper plate provided on the surface of the second magnet, wherein the first magnet and the second magnet Speakers arranged so that magnets repel each other. 11. The speaker according to claim 10, wherein a third magnet is provided on a surface of the second upper plate, and the second magnet and the third magnet are arranged so as to repel each other. The speaker according to claim 10, wherein the vibration component is configured only in one of the first magnetic circuit and the second magnetic circuit. The speaker according to claim 10, wherein an outer dimension of the second magnet is smaller than an outer dimension of the yoke. The speaker according to claim 10, wherein the volume of the first magnet is larger than the volume of the second magnet. 11. The speaker according to claim 10, wherein the frequency of the electric signal converted by the first magnetic circuit is lower than the frequency of the electric signal converted by the second magnetic circuit. A module comprising the speaker according to any one of claims 10 to 15 and an electronic circuit. The electronic device which has a speaker as described in any one of Claims 10-15. The apparatus carrying the speaker as described in any one of Claims 10-15.

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