JP2006121325A - Panel-type speaker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a panel-type speaker having superior excitation characteristics, irrespective of the type, such as electromagnetic, piezoelectric or flexural vibration. <P>SOLUTION: In this panel-type speaker, an opening (Q) is formed on a diaphragm (P), and a plate-like diaphragm (R) for band correction for closing this opening is attached to the diaphragm (P). Also, an exciter (E) is fixed on the rear surface of the diaphragm (R) for band correction, a sub-panel fixed on the tip of the bobbin of the electromagnetic type exciter (E) is fixed in the opening (Q), or the case of the flexural vibration type exciter (E) is fixed inside the opening (Q). <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a panel type speaker that uses a protective panel of a display device as a diaphragm.

  Conventionally, panel type speakers using a protective panel of a display device as a diaphragm have been developed. In this panel type speaker, an electromagnetic or piezoelectric exciter is fixed in a suspended state on the back side of a protective panel of a display device used as a diaphragm, and vibrations in the front-rear direction are transmitted from the exciter to the protective panel. The protective panel is configured to excite bending vibration (Patent Document 1). Since this panel type speaker is small and has high sound quality, it is being widely used in portable devices such as mobile phones that are small and have high mounting density.

  In Patent Document 2, in order to improve the excitation efficiency by an exciter, as shown in FIG. 6, a thin portion is formed around the diaphragm P that also serves as a protective panel of the display device, and a piezoelectric type is formed on the thin portion. A technique of mounting an exciter E is disclosed. In FIG. 6, H denotes a support frame that supports the protective panel.

JP2003-143690A (FIG. 1) Japanese Patent Laying-Open No. 2002-232542 (FIG. 2)

  In the panel type speaker of Patent Document 2 described above, in order to increase the excitation efficiency, a thin portion is formed on the diaphragm, and an exciter is fixed thereto. The optimum value of the thickness of the fixed portion varies depending on the frequency characteristics, sound output, dimensions, etc. of the exciter attached here. As a result, when the failed exciter is changed to a different model, or to a different type such as an electromagnetic type, a piezoelectric type, or a flexural vibration type, the thickness of the thin portion of the diaphragm does not match this type or type. There is a problem that the characteristics deteriorate.

  The panel type speaker according to the first aspect of the present invention that solves the above-described problems of the prior art has an opening formed in a diaphragm that also serves as a protective plate or other plate-like body of a display device, and is for plate-shaped band correction that closes the opening. A diaphragm is attached to the diaphragm, and the exciter is fixed to the back surface of the band correcting diaphragm.

  In the panel type speaker of the second invention, an opening is formed in a diaphragm that also serves as a protective plate or other plate-like body of the display device, and a sub-panel fixed to the tip of the bobbin of the electrode type exciter is in this opening. It is configured to be fitted and fixed.

  In the panel type speaker of the third invention, an opening is formed in a diaphragm that also serves as a protective plate or other plate-like body of a display device, and a flexural vibration type exciter used as an exciter is housed in a case. The upper or lower surface of the case is configured to be fitted and fixed in the opening.

  The panel type speaker according to the first aspect of the present invention can be combined with a band correcting diaphragm that closes the opening and an exciter, so that an optimum thickness and material for exciting flexural vibration to the diaphragm matching the frequency characteristics of the exciter can be obtained. A band correcting diaphragm can be used. Further, even when exciters are exchanged for different types or types, it is possible to realize optimum excitation characteristics.

  Since the panel type speakers of the second and third inventions are configured so that the sub-panel of the exciter and the wall surface of the case are also used as the band correcting diaphragm, the band correcting diaphragm is omitted. Optimum excitation efficiency can be achieved while simplifying.

  According to a preferred embodiment of the first invention, the band correcting diaphragm is made of a resin having a thickness different from that of the diaphragm.

  According to another preferred embodiment of the present invention, the band correcting diaphragm is made of a material different from that of the diaphragm and is made of a resin, an aluminum alloy, a titanium alloy or other metal. ing.

  FIG. 1 is a partial cross-sectional view showing the configuration of a panel type speaker according to an embodiment of the first invention. P is a diaphragm that also serves as a protective plate of a liquid crystal display device such as a monitor or a cellular phone, and Q is a diaphragm. A circular opening formed in the peripheral portion of P, R is a band correcting diaphragm fitted into the opening Q and bonded and fixed to the diaphragm P, and E is bonded and fixed to the band correcting diaphragm R in a suspended state. It is an electromagnetic (movable wire ring) exciter. Further, in this movable ring-shaped exciter E, m is a magnetic circuit, b is a cylindrical bobbin, and s is a sub-panel fixed to the tip surface of the bobbin.

  The diaphragm P is formed of a plate such as a resin, and also serves as a protective plate that protects the surface of a liquid crystal display device such as a monitor or a mobile phone. The band correcting diaphragm R is formed of a resin having a thickness smaller than that of the diaphragm P, and is fitted into the opening Q so that the surface thereof is on the same plane as the surface of the diaphragm P. The band correcting diaphragm R is fixed to the inner wall surface of the opening Q and the back surface of the diaphragm P around the opening Q with an adhesive. A sub-panel s fixed to the tip of the bobbin b of the exciter E is bonded and fixed to the back surface of the band correcting diaphragm Q.

  In the movable wire ring exciter E, the wire ring (voice coil) wound around the bobbin b is disposed in the magnetic gap formed in the magnetic circuit m. When an AC signal in the audio frequency band is supplied to this voice coil through a signal line (not shown), a driving force in the front-rear direction (the central axis direction of the cylindrical bobbin b) is generated, and the bobbin vibrates back and forth. . This vibration is transmitted to the band correcting diaphragm R through the sub panel s. As a result, the band correcting diaphragm R vibrates back and forth, and flexural vibration is excited by the diaphragm P, and this excited flexural vibration propagates from the peripheral portion of the diaphragm P to which the exciter is fixed to its central portion. .

  The thickness of the band correcting diaphragm R is selected in consideration of its diameter, the center frequency of the audio signal generated by the exciter E, the thickness of the diaphragm P, and the like. As an example, the thickness of the band correcting diaphragm R is selected so that the natural frequency (resonance frequency) considering deformation around the opening Q of the diaphragm P substantially matches the center frequency of the audio signal generated by the exciter E. Is done. The exciter may be divided into a low-frequency range, a middle / high-frequency range, or the like, or may cover the entire range with one. In general, the thickness of the band correcting diaphragm R decreases as the frequency of the audio signal handled by the exciter E increases.

  As a material of the band correcting diaphragm R, a metal such as an aluminum alloy or a titanium alloy having a large rigidity and a vibration Q value can be used in addition to a resin. As described above, by using the band correcting diaphragm R having a material and thickness different from those of the diaphragm P, the overall frequency characteristics combined with the diaphragm P are improved, and the wideband sound quality, the left / right separation degree, The degree of sound separation is improved. It is also possible to design an optimal vibration mode and adjust the sound quality.

  FIG. 2A is a front view showing the configuration of a panel type speaker according to another embodiment of the first invention, and FIG. 2, the same reference numerals as those in FIG. 1 denote the same components as those already described with reference to the embodiment of FIG. 1, and a duplicate description thereof will be omitted. In the panel type speaker of this embodiment, an approximately elliptical opening Q is formed in the periphery of the diaphragm P, and an elliptical band correcting diaphragm R is fitted into the opening Q and fixedly bonded.

  The sub-panels of the two movable wire ring exciters E1 and E2 are fixed to the band correcting diaphragm R with an adhesive. The exciters E1 and E2 are not suspended in the band correcting diaphragm R but are held by holding mechanisms H1 and H2 that also hold the diaphragm P. In this way, instead of generating a desired full audio output by one large exciter, a configuration is made in which two small exciters are operated in parallel to generate half of each audio output. The size of the exciter, and hence the width of the opening Q and the band correcting diaphragm R, can be reduced, and the space required for mounting can be reduced.

  FIG. 3A is a front view showing the configuration of a panel type speaker according to still another embodiment of the first invention, and FIG. 3B is a B-B ′ partial cross-sectional view thereof. 3, the same reference numerals as those shown in FIGS. 1 and 2 are the same as those already described with respect to the embodiment shown in FIGS. 1 and 2, and redundant description thereof will be omitted. In the panel type speaker of this embodiment, the high-frequency exciter E1 is bonded and fixed to the band correcting diaphragm R that is fitted and fixed in a circular opening Q formed in the peripheral portion of the diaphragm P. ing. On the other hand, the mid / low tone exciter E2 is bonded and fixed to the back surface of the diaphragm P as in the prior art. In this way, only one of the pair of exciters is bonded and fixed to the band correcting diaphragm R fitted in the opening.

  FIG. 4 is a partial cross-sectional view showing a configuration of a panel type speaker according to one embodiment of the second invention. 4, the same reference numerals as those in FIGS. 1 to 3 are the same as those already described with reference to the embodiment of FIGS. 1 to 3, and redundant description thereof is omitted. . In the panel type speaker of this embodiment, the sub-panel s fixed to the tip surface of the bobbin b of the movable wire ring exciter E also serves as the band correcting diaphragm R of the speaker of the embodiment of FIGS. For this reason, the band correcting diaphragm R is omitted.

  In order to use the sub-panel s as the band correcting diaphragm R, the diameter and thickness of the sub-panel s are made larger than those of a normal exciter. The peripheral part of the sub-panel s made of resin is bonded and fixed to the inner wall surface of the opening Q formed in the peripheral part of the diaphragm P. When a voice signal is supplied to the voice coil and the bobbin b and the sub-panel s vibrate back and forth, flexural vibration is excited in the diaphragm P. The excited flexural vibration propagates from the peripheral portion of the diaphragm P to which the exciter E is fixed to the central portion thereof.

  FIG. 5A is a front view showing the configuration of a panel type speaker according to an embodiment of the third invention, and FIG. 5B is a B-B ′ partial sectional view thereof. In FIG. 5, the constituent elements having the same reference numerals as those in FIGS. 1 to 4 are the same as the constituent elements already described with respect to the embodiment of FIGS. To do. In the panel type speaker of this embodiment, a rectangular opening Q is formed on an upper part of a diaphragm P that also serves as a protective plate of a liquid crystal display panel of a cellular phone, and a case of a flexural vibration exciter E is fitted into the opening Q. Are fixed by bonding.

  As shown in the cross-sectional view of FIG. 6, the flexural vibration exciter E is composed of a rectangular case C, beams b1 and b2 which are held by the case C and perform flexural vibration, and signal input terminals t1 and t2. Yes. The upper and lower surfaces and side surfaces of the case C are flat surfaces, and as shown in FIG. 5, the upper and lower surfaces of the case C are located in the same plane as the surface of the diaphragm P that also serves as a protective plate of the liquid crystal display panel. As described above, the case C is fitted into the rectangular opening Q formed in the diaphragm P and is fixedly bonded.

  The configuration in which the panel type speaker of the present invention is attached to a small portable electronic device such as a mobile phone has been exemplified above. However, this panel type speaker can be installed on the back side of a protective plate of a stationary electronic device such as a personal computer.

It is a fragmentary sectional view which shows the structure of the panel type speaker of one Example of this 1st invention. It is a fragmentary sectional view which shows the structure of the panel-type speaker of the other Example of this 1st invention. It is a fragmentary sectional view which shows the structure of the panel type speaker of the further another Example of this 1st invention. It is a fragmentary sectional view which shows the structure of the panel type speaker of one Example of this 2nd invention. It is a fragmentary sectional view which shows the structure of the panel type speaker of one Example of this 3rd invention. It is a disassembled perspective view which shows the structure of the flexural vibration type exciter of the Example of FIG. It is a fragmentary sectional view which shows an example of a structure of the conventional panel type speaker.

Explanation of symbols

P Diaphragm that also serves as a protective plate for the display device
Q Openings formed in the diaphragm
R-band correction diaphragm
E, E1, E2 Exciter m Magnetic circuit b Bobbin of movable ring type exciter s Sub panel of movable line ring type exciter
C Flexural vibration exciter case
B Flexural exciter holder
b1, b2 Bending vibration exciter beam

Claims (8)

Vibration that uses a protective plate or other plate-like body of the display device as a diaphragm, and excites bending vibration to this diaphragm by transmitting vibrations in the front-rear direction to the diaphragm from an exciter installed on the back of the diaphragm. In mode type panel type speaker,
A panel in which an opening is formed in the diaphragm, a plate-shaped band correcting diaphragm for closing the opening is attached to the diaphragm, and the exciter is fixed to the back surface of the band correcting diaphragm. Type speaker. In claim 1,
The panel-type speaker, wherein the band correcting diaphragm is a resin having a thickness different from that of the diaphragm. In claim 1,
The panel type speaker, wherein the band correcting diaphragm has a material different from that of the diaphragm. In claim 3,
A panel type speaker characterized in that the band correcting diaphragm is made of an aluminum alloy, a titanium alloy or another metal. In any one of Claims 1 thru | or 4,
The panel type speaker, wherein the band correcting diaphragm is fixed to the diaphragm by adhesion. In any one of Claims 1 thru | or 5,
The exciter is an electromagnetic type or a piezoelectric type, and is a panel type speaker. A protective plate or other plate-like body of the display device is used as a diaphragm. By transmitting vibrations in the front-rear direction to the diaphragm from an electromagnetic exciter installed on the back of the diaphragm, flexural vibration is applied to the diaphragm. In the vibration mode method panel type speaker to excite
A panel type speaker in which an opening is formed in the diaphragm and a sub-panel fixed to a tip of a bobbin of the electrode type exciter is fitted and fixed in the opening. Using a protective plate or other plate-like body of the display device as a diaphragm, flexural vibration is transmitted to the diaphragm by transmitting vibrations in the front-rear direction to the diaphragm from a flexural vibration exciter installed on the back of the diaphragm. In a vibration mode panel speaker that excites
An opening is formed in the diaphragm, and the flexural vibration exciter is accommodated in a case, and the case is fitted and fixed in the opening.

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