JP2006025169A - Speaker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a speaker which can be reduced in thickness. <P>SOLUTION: A through hole 2c is formed in a transparent vibration panel 2, and a coil 5 is fixed in the through hole 2c. Both ends of the vertical direction of an excitation member 3A are fixed to the vibration panel 2, a magnet 6 and a yoke 7 are fixed to the excitation member 3A, and the magnet 6 and the yoke 7 are opposed are made to face inside the coil 5. By this configuration, since the projecting dimension of a vibration generating means 4 in a Z2 direction from the vibration panel 2 can be reduced, the speaker 1 can be configured so as to be reduced in thickness. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a speaker that generates sound by vibrating a transparent panel of a display device or a panel constituting a casing of an electronic device, and more particularly to a speaker that can be configured to be thin.

  A panel-type speaker that generates sound by exciting a planar vibration panel is described in Patent Document 1, for example.

In the speaker described in Patent Document 1, a small panel smaller than the large panel is provided on a large panel, and an exciter is provided on the small panel. In the speaker, when the exciter is driven, the small panel is vibrated, and the vibration of the small panel is transmitted to the large panel, and sound is emitted from the large panel and the small panel.
JP-T-2002-505814

  Since the speaker disclosed in Patent Document 1 is a small panel having an exciter placed on the surface of a large panel, the maximum size of the panel speaker can be reduced between the large panel, the small panel, and the exciter. The dimension cannot be smaller than the accumulated value. Therefore, there is a limit to the reduction in thickness. On the other hand, various electronic devices on which panel speakers are to be mounted tend to be thin, and it is desired that this type of panel speaker is also thin.

  SUMMARY OF THE INVENTION The present invention solves the above-described conventional problems, and an object of the present invention is to provide a speaker that generates sound by exciting a vibration panel and can be thinned.

The present invention includes a vibration panel, an excitation member that is formed of a magnetic material having a smaller area than the vibration panel, and is directly or indirectly fixed to the vibration panel via another member; In a speaker having vibration generating means for vibrating the excitation member, and sound is emitted from the vibration panel due to vibration of the excitation member and the vibration panel,
The vibration generating means includes a magnet provided on one side of the vibration panel or the excitation member and a coil provided on the other side, and a recess or a through hole is formed in the vibration panel, so that the coil or the magnet At least a part is embedded in the recess or the through hole.

  In the speaker of the present invention, since the coil or magnet constituting the vibration generating means is embedded in a recess or a through hole formed in the vibration panel, the protrusion amount of the vibration generating means on the surface of the vibration panel can be reduced. Can be made thin.

  Further, according to the present invention, in the vibration generating means, the coil is provided on the vibration panel side, the coil is fixed to a support substrate having a surface orthogonal to the winding axis direction, and the coil is the vibration panel. The support substrate is fixed to the surface of the vibration panel in a state of being inserted into the through hole.

  If the coil is fixed to the support substrate and the support substrate is fixed to the surface of the vibration panel with the coil inserted in the through hole of the vibration panel, the coil placed in the through hole can be reliably supported and is thin. However, a speaker with high coil support strength can be configured.

  In this case, it is preferable that the support substrate is fixed to the vibration panel on the side opposite to the side facing the excitation member, and the through hole is closed by the support substrate.

  By embedding a coil in the through hole of the vibration panel, the entire speaker can be made thin.However, if the through hole is formed, the vibration that one side of the vibration panel gives to the air and the vibration that the other side gives to the air Since the phases are different by 180 degrees, the air vibrations cancel each other through the through holes. However, by covering the through hole with the support substrate, it is possible to prevent a decrease in output due to such vibration cancellation.

  For example, the excitation member has an elongated shape whose vertical length dimension is larger than the width dimension, and both end portions or one end portion of the excitation member facing in the vertical direction are directly attached to the vibration panel or another member. The magnet and the coil have an elongated shape that is long in the longitudinal direction of the excitation member.

  By arranging the elongated vibration generating means at the end of the vibration panel as described above, the panel see-through glass of the liquid crystal display device can be used as the vibration panel.

  According to the speaker of the present invention, the protruding dimension of the vibration generating means from the vibration panel can be reduced, and the speaker can be configured to be thin.

  1 is an exploded perspective view showing a speaker of the present invention, FIG. 2 is a sectional view taken along line II-II in FIG. 1, and FIG. 3 is a perspective view showing an example of an electronic apparatus on which the speaker of the present invention is mounted. .

  The speaker 1 of the present invention includes a vibration panel 2, an excitation member 3 </ b> A, and vibration generation means 4, and can generate sound from the vibration panel 2. The vibration panel 2 is a transparent substrate formed of a highly transparent material such as acrylic resin, polycarbonate, or glass, for example, into a square plate shape.

  For example, the speaker 1 can be disposed on the display unit of the mobile phone 100 which is an example of the electronic apparatus illustrated in FIG. In this case, the surface panel of the liquid crystal display panel of the mobile phone 100 is driven as the vibration panel 2 so that sound can be emitted from the surface of the liquid crystal display panel toward the user.

  The excitation member 3 </ b> A is formed of a magnetic material such as iron or ferrite, for example, and has a sufficiently smaller area than the vibration panel 2. The excitation member 3 </ b> A is disposed along the Y <b> 2 side edge 2 d around the vibration panel 2, and is mounted on the Z <b> 2 side surface (back surface). The excitation member 3A has an elongated shape in which the length in the vertical direction is longer than the length in the horizontal direction when the X1-X2 direction is the vertical direction and the Y1-Y2 direction is the horizontal direction.

  Both ends in the vertical direction of the excitation member 3A are bent into a substantially L shape, and a first fixing portion 3a and a second fixing portion 3b fixed to the vibration panel 2 are formed at both ends in the vertical direction. Has been. Further, the excitation member 3A has bent portions 3c and 3d in which the edge portions on the Y1 side and the Y2 side are respectively bent perpendicularly to the vibration panel 2 side. The bent portions 3c and 3d are formed in substantially the entire length in the vertical direction between the first fixed portion 3a and the second fixed portion 3b. The dimensions of the bent portions 3c and 3d are such that the tips of the bent portions 3c and 3d do not contact the vibrating panel 2 when the first fixed portion 3a and the second fixed portion 3b are fixed to the vibrating panel 2. Is set to

  As shown in FIG. 1, the first fixing portion 3a and the second fixing portion 3b formed on the excitation member 3A are equal from the edge portion 2a on the X1 side and the edge portion 2b on the X2 side of the vibration panel 2, respectively. It is provided at a position separated by a distance L1 and is fixed to the surface of the vibration panel 2 by adhesion.

  A vibration generating means 4 is provided between the vibration panel 2 and the excitation member 3A. As shown in FIG. 2, the vibration generating means 4 includes a coil 5 and a magnet 6 that face each other. Further, a yoke 7 made of a magnetic material is provided on the surface (front surface) on the Z1 side of the magnet 6 in an overlapping manner.

  In the vibration panel 2, a through hole 2 c that penetrates the panel is formed in a region where the vibration generating means 4 is installed. The through hole 2 c has a rectangular shape, and its long side opens in parallel with the edge 2 d of the vibration panel 2. As shown in FIG. 1, the coil 5 is wound in a rectangular prismatic shape, and as shown in FIG. 2, the outer peripheral surface thereof is bonded and fixed to the periphery of the through hole 2 c. The coil 5 wound in the shape of a rectangular rectangular tube has longitudinal conduction paths 5a1 and 5a2 through which current flows along the edge 2d of the vibration panel 2, and a lateral passage through which current flows in a direction perpendicular to the edge 2d. It has electric circuits 5b1 and 5b2.

  The magnet 6 is a permanent magnet, and is fixed to an intermediate portion in the X1-X2 direction of the excitation member 3A via an adhesive or the like. The magnet 6 is rectangular like the coil 5, the side surfaces 6 a, 6 b on the long side face the longitudinal conduction paths 5 a 1, 5 a 2 of the coil 5, and the side surfaces 6 a, 6 b on the short side are sideways of the coil 5. Opposite the directional energization paths 5b1 and 5b2. As shown in FIG. 2, the yoke 7 fixed to the magnet 6 is made of a magnetic material such as iron or ferrite and has the same area as the magnet 6. In the state where the vibration generating means 4 is assembled, the yoke 7 faces the inside of the coil 5, and the bent portion 3 c of the excitation member 3 </ b> A faces the outer periphery of the coil 5.

  In the example shown in FIG. 2, the magnet 6 is magnetized so as to have different magnetic poles in the thickness direction, and as a result, as shown by the arrows in FIG. A magnetic path is formed across the coil 5 from the bent portion 3c into the excitation member 3A.

  When a current based on the audio signal is applied to the coil 5, the excitation member 3 </ b> A is caused by an electromagnetic force action of the magnetic field crossing the longitudinal conduction paths 5 a 1, 5 a 2 and the lateral conduction paths 5 b 1, 5 b 2 of the coil 5 and the current. It is vibrated in the Z1-Z2 direction, and the reaction of the excitation is applied from the coil 5 to the vibration panel 2. Further, the flexural vibration of the excitation member 3A is given to the vibration panel 2 from the first fixed portion 3a and the second fixed portion 3b. Therefore, the vibration panel 2 is excited with a relatively large amplitude, and sound generation is obtained from the vibration panel 2.

  As shown in FIG. 1, in the speaker 1, an elastic member 8 such as a square frame rubber is fixed around the vibration panel 2 from the surface on the Z <b> 2 side. A square frame 9 is bonded and fixed to the elastic member 8.

  As shown in FIG. 3, a display window 102 is opened in the casing 101 of the mobile phone, and the speaker 1 shown in FIG. 1 has a surface facing the Z1 side of the transparent vibration panel 2 of the display window 102. It is fixed to the inner surface of the housing 101 on the inner side. Inside the housing 101, a thin display panel such as a liquid crystal display device or an organic EL (electroluminescence) display device is installed on the back side of the vibration panel 2.

  In the speaker 1 of the present invention, the through-hole 2c is formed in the vibration panel 2, and a part of the coil 5 is embedded in the through-hole 2c. Therefore, from the surface on the Z1 side of the vibration panel 2 to the excitation member 3A. The thickness T1 can be reduced, and the arrangement design of the mechanism inside the housing 101 can be facilitated.

  FIG. 4 shows a speaker 1A according to the second embodiment of the present invention, and is a cross-sectional view similar to FIG.

  In this embodiment, the coil 5 is fixed to the support substrate 10. In other words, the surface of the coil 5 wound in a rectangular rectangular tube shape that is orthogonal to the winding axis direction (Z direction) is bonded and fixed to the planar surface 10 a of the support substrate 10. Then, the coil 5 is inserted into the through hole 2c formed in the vibration panel 2, and the support substrate 10 is bonded and fixed to the surface of the vibration panel 2 facing the Z1 direction. Then, the through hole 2 c is closed with the support substrate 10.

  The support substrate 10 is a hard substrate such as glass epoxy or a flexible film substrate. The coil 5 is bonded and fixed to the support substrate 10. At this time, the end of the conductive wire of the coil 5 is connected to the conductive pattern formed on the surface of the support substrate 10, and the coil 5 is energized through the conductive pattern. It may be a thing.

  Since the coil 5 is bonded to the support substrate 10 and is fixed to the vibration panel 2 via the support substrate 10, it is easy to attach the coil 5 in the through hole 2 c of the vibration panel 2. Is positioned and fixed securely in the through hole 2c.

  In addition, since the through hole 2c is closed by the support substrate 10, the air vibration pressed on the surface facing the Z1 side of the vibration panel 2 and the Z2 side of the vibration panel 2 that is 180 degrees out of phase with this. It is possible to prevent the air vibration on the surface facing the air from interfering via the inside of the through hole 2c, and to suppress a decrease in sound output due to the formation of the through hole 2c.

  As a modification of the embodiment shown in FIG. 4, a frame-shaped support substrate 10 </ b> A is used, the support substrate 10 </ b> A is fixed to the outer peripheral surface of the coil 5, and the support substrate 10 </ b> A faces the Z <b> 2 direction of the vibration panel 2. The support of the coil 5 may be reinforced by bonding and fixing to the surface. Alternatively, the coil 5 may be fixed to the vibration panel 2 only by the support substrate 10A.

  As shown in FIG. 3, the speaker 1 is not limited to one that vibrates the transparent vibration panel 2 installed in the display window 102 of the electronic device, and the plastic casing itself of the electronic device is used as the vibration panel. It may be used and sounded from the casing itself.

  In addition, instead of forming a through hole in the vibration panel 2, a concave portion that is recessed toward the Z1 direction is formed on the surface of the vibration panel 2 on the Z2 side, and a part of the coil 5 is embedded in the concave portion. Also good. Alternatively, the vibration generating means may be configured by embedding a magnet or a yoke in the through hole 2c formed in the vibration panel 2 or in the recess, and fixing the coil to the excitation member 3A.

An exploded perspective view showing a speaker of the present invention, A sectional view taken along line II-II in FIG. The perspective view which shows the electronic device by which the speaker of this invention is mounted, Sectional drawing similar to FIG. 2 which shows the speaker of other embodiment of this invention,

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,1A Speaker 2 Vibration panel 2c Through-hole 3A Excitation member 3a 1st fixing | fixed part 3b 2nd fixing | fixed part 4 Vibration generating means 5 Coil 5a1, 5a2 Longitudinal current path 6 Magnet 7 Yoke 10 Support substrate

Claims (4)

A vibration panel, an excitation member that has a smaller area than the vibration panel, is formed of a magnetic material, and is directly or indirectly fixed to the vibration panel via another member; and the excitation member. A speaker that emits sound from the vibration panel due to vibration of the excitation member and the vibration panel;
The vibration generating means includes a magnet provided on one side of the vibration panel or the excitation member and a coil provided on the other side, and a recess or a through hole is formed in the vibration panel, so that the coil or the magnet At least a part is embedded in the recess or the through hole.   In the vibration generating means, the coil is provided on the vibration panel side, the coil is fixed to a support substrate having a surface orthogonal to the winding axis direction, and the coil is inserted into the through hole of the vibration panel. The speaker according to claim 1, wherein the support substrate is fixed to a surface of the vibration panel in a state of being applied.   The speaker according to claim 2, wherein the support substrate is fixed to the vibration panel on a side opposite to the side where the excitation member faces, and the through hole is closed by the support substrate.   The excitation member has an elongated shape having a longitudinal length dimension larger than a lateral width dimension, and both end portions or one end portion of the excitation member facing the longitudinal direction are directly on the vibration panel or via another member. The speaker according to any one of claims 1 to 3, wherein the speaker and the coil have an elongated shape that is long in a longitudinal direction of the excitation member.

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