JP3408476B2 - Flat speaker system - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flat speaker system in which a pair of flat speakers are combined in a wedge shape to facilitate self-standing.

[0002]

2. Description of the Related Art FIG. 16 is a vertical sectional view showing an example of a conventional flat speaker system. A planar speaker system 11 shown in the figure is a system in which a flat planar speaker 1 is placed on a floor or a table via a dedicated speaker stand 12. The flat speaker 1 drives a square vibration film 2 from the back side by a voice coil type exciter (exciter) 3. The vibrator 3 includes a voice coil 5 having one end bonded to the center of the back surface of the vibrating membrane 2 via a piston plate 4, and a columnar magnet 6 and the like coaxially arranged on the other end side of the voice coil 5. Composed. The columnar magnet 6 is housed in a bottomed cylindrical yoke 7 with a collar, and is attached to the peripheral portion of a dish-shaped back plate 8 that holds a buffer sleeve 7 a fitted in the cylindrical portion of the yoke 7. The support frame 9 has a ring-shaped gasket 9a for maintaining the film shape.
The peripheral portion of the vibrating membrane 2 is fixed via the. The voice coil 5 is connected to the flange portion of the yoke 7 by a damper 10 whose one end is connected to its side surface. The conventional vibrator 3 moves the piston plate 4 in the front-back direction by the Fleming force generated in the voice coil 5 when the voice coil 5 in the magnetic field formed by the columnar magnet 6 is excited by the voice current. The vibrating membrane 2 that is driven and vibrates generates sound pressure.

[0003]

In the conventional flat speaker system 11 described above, the flat speaker 1 has a structure in which the piston plate 4 at the tip of the vibrator 3 is fixed to the back surface of the vibrating membrane 2 by adhesion or the like. The peripheral edge of the is supported by the support frame 9 via the ring-shaped gasket 9a for maintaining the film shape. However, the gasket 9a itself does not hinder the vibration of the vibrating membrane 2 or give an extra load. However, only the necessary minimum film shape maintaining force is given, and from the driving principle, the vibrating film 2 is manufactured on the assumption that all four sides are free ends. Therefore, the speaker stand 12 is attached to the support frame 9
Even if the support frame 9 is supported, or even if the support frame 9 is directly hooked on the wall surface for use, the rigidity gradually decreases due to moisture absorbed from the outside air after a certain period of use, As a result of a slight warping or bending, a precise piston vibration of the vibrating membrane 2 cannot be expected, the periphery of the vibrating membrane 2 touches the surroundings and causes flicker, or the deformed portion causes the voice coil 5 to vibrate. The operation of the vibration exciter 3 is squeezed by pressing the button, and in an extreme case, the voice coil 5 comes into contact with the magnetic circuit to generate a sliding sound, and the reproduced sound is gradually cut off and lacks clarity. There were problems such as. In addition to the reason that the environment such as temperature and humidity on the front surface and the back surface of the vibrating membrane 2 is different, the warping or slack occurring in the vibrating membrane 2 is such that the acting gravity or external stress is different between the upper and lower sides and the left and right sides. The conventional flat speaker system 11 has a problem that there are many factors that impede constant stable reproduction.

Further, instead of assuming that the speaker stand 12 is used, for example, as a part of an attempt to combine a plurality of flat speakers 1 and place them independently on a desk, the pair of flat speakers 1 are supported by the upper side of the support frame. I had considered a tentative plan to combine them with and make them stand in a wedge shape. However,
Since the size of the vibration exciter 3 for driving the vibrating membrane 2 and the magnetic efficiency are in inverse proportion to each other, in order to obtain a certain sound pressure, the vibration exciter 3 having a high space occupancy must be used. However, it is difficult to reduce the oblique angle of both flat speakers 1, that is, the wedge angle to a certain value or less, and there is a problem that the self-standing placement posture is restricted. Originally, the drawback that the vibration exciter 3 became large was rooted in the structure of the conventional planar speaker 1. That is, the conventional flat speaker 1
Has the piston plate 4 at the tip of the vibrator 3 fixed to the back surface of the vibrating membrane 2 by adhesion or the like, and since a certain bonding area is required for the fixing, the vibration of the vibrating membrane 2 is
The damper 10 that connects the voice coil 5 to the yoke 7 is required to have strength enough to withstand the weight of the vibrating membrane 2, so that the light movement of the voice coil 5 is likely to be hindered, and the piston plate 4 In order to absorb the posture deviation when the is fixed to the vibrating membrane 2, it is necessary to secure some room for the axial line inclination in the voice coil 5.
Therefore, the magnetic gap between the voice coil 5 and the magnetic circuit surrounding the voice coil 5 cannot be minimized, and it is difficult to maximize the magnetic efficiency. Therefore, it is very difficult to reduce the size of the vibrator 3 while ensuring the magnetic efficiency.

In addition, the conventional flat speaker 1 has a vibrator 3
Since the vibrating film driving ability of is proportional to the generated magnetic force of the columnar magnet 6 and the number of coil turns of the voice coil 5, it is attempted to secure the sound pressure practically required without changing the specifications of the voice coil 5 and the columnar magnet 6. The only way to reduce the weight of the vibrating membrane 2 was. This is because in order to efficiently transfer the applied vibration energy to the atmosphere, it is necessary to statically move the vibrating membrane 2 back and forth in the front-rear direction while maintaining a flat surface in the largest possible area. It has been a big mission for speaker developers to reduce the weight of the diaphragm 2. However, a vibrating membrane suitable for weight reduction generally means the use of an expensive membrane material, and the more expensive the membrane material, the lower the workability. Therefore, in reality, the vibrating membrane 2 having a certain weight must be used. Since the output sound pressure level in this case is about 70 to 80 dB / W, 90
To obtain a sound pressure of more than dB, add 1 to the power amplifier that is the driving source.
An amplifier having an output of 0 W or more was required. Thus, the conventional flat speaker 1 cannot be used by directly connecting it to the headphone output terminal of a portable audio device with a power output of, for example, several tens of mW, and is used outdoors under the assumption of battery drive. The reality was that there was no way around.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to combine a pair of flat speakers in a wedge shape to facilitate independent mounting.

[0007]

In order to achieve the above object, a flat speaker system of the present invention according to claim 1 is
A pair of flat speakers that vibrate and drive a vibrating film stretched on a polygonal support frame by vibrating means supported by the support frame, and a part of each of the support frames of the pair of flat speakers are connected to each other, and It is characterized in that it comprises a coupling means for making the pair of support frames self-standing in a mounting posture in which they are obliquely crossed with each other in a wedge shape.

Further, the coupling means includes a spacer rod having a wedge-shaped cross section in which one side of each of the support frames is fixed to the left and right side surfaces, or the coupling means connects the pair of vibrating means to each other. A coupling frame for fixing the mutual positional relationship of the pair of vibrating means, or the coupling means,
It is characterized in that it includes a hinge having a pair of opening and closing door portions to which one side of each of the support frames is fixed.

Further, in the pair of flat speakers, one flat speaker has a vibrating surface divided into two, and each of the divided vibrating surfaces is used for mid-range reproduction or high-range reproduction or mid-high range reproduction, and the other plane. The speaker is used for low frequency reproduction. In addition, the one flat speaker has a vibrating surface obtained by dividing a single vibrating film into two by frets. Alternatively, one of the planar speakers obtained by dividing the vibrating surface in two is characterized in that a division boundary is formed by a gap having a width equal to or larger than a width of a vibrator for the other planar speaker.

According to a ninth aspect of the present invention, in the flat speaker system of the present invention, a polygonal support frame is folded in two in a wedge shape and the frets are bridged by connecting the folds, and the support frame is stretched on the support frame. And a pair of vibrating means that are supported by the support frame and that individually vibrate and drive the two-divided vibrating membranes.

Further, the two-divided vibrating membrane is characterized in that one is for middle and high range reproduction and the other is for low range reproduction.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to FIGS. 1 is a schematic perspective view showing a first embodiment of a flat speaker system of the present invention, and FIG. 2 is a vertical sectional view of the flat speaker system shown in FIG.
3 is a sectional view of the vibrator shown in FIG. 2, FIG. 4 (A),
(B) is a longitudinal sectional view showing a different modification of the flat speaker system shown in FIG. 1, FIG. 5 is a schematic perspective view showing a second embodiment of the flat speaker system of the present invention, and FIG. 5 is a vertical cross-sectional view of the flat speaker system shown in FIG.
7A and 7B are schematic perspective views and schematic side views showing other examples of use of the flat panel speaker system shown in FIG. 5, and FIGS. 8A and 8B are respectively shown in FIG. 9A and 9B are schematic perspective views and schematic side views showing different examples of use of the flat panel speaker system shown in FIGS. 9A and 9B, respectively. A circuit diagram showing an example of an auxiliary circuit, FIG.
FIG. 11B is a schematic perspective view and a sectional view showing a modification of the flat panel speaker system shown in FIG. 9, and FIG.
(B) and (C) are side views, schematic perspective views and sectional views showing other modifications of the flat panel speaker system shown in FIG. 9, respectively, and (A), (B), and (C) of FIG. A schematic perspective view, a longitudinal sectional view and a schematic exploded perspective view showing a third embodiment of the flat speaker system of the present invention, respectively, FIG.
1B is a schematic perspective view and a schematic side view showing another example of use of the flat panel speaker system shown in FIG. 12, respectively.
4 (A) and 4 (B) are schematic perspective views and schematic side views showing different usage examples of the flat panel speaker system shown in FIG. 12, and FIGS. 15 (A) and 15 (B) are respectively shown in FIG. It is a schematic side view which shows the other different usage example of a flat speaker system.

The flat speaker system 31 shown in FIGS.
Is a pair of flat speakers 21 having the same structure and a support frame 23.
The upper side portion is integrated with the spacer rod 32 so as to be coupled in a wedge shape (here, an inverted V shape). As the flat speaker 21, a rectangular vibrating membrane 22 called a tensed diaphragm is supported on four sides by a rectangular frame-shaped support frame 23, and a central portion of the back surface of the vibrating membrane 22 is vibrated by an exciter 24 which is a vibrating means. A structure in which a piston is driven to generate sound is used. Each support frame 23 has its upper side fixed to the left and right inclined side surfaces of a spacer rod 32 having a wedge-shaped cross section, and has a pair of planar speakers 21 with a wedge angle θ of the spacer rod 32 as a coupling means.
Can be self-reliant.

That is, the flat speaker system 31 is
The pair of flat speakers 21 can be mounted with the wedge facing right above the speaker mounting surface or with the wedge facing right side, and therefore, a self-supporting means such as a speaker stand, an easel, or a mounting bracket is unnecessary. is there. In the present embodiment, since the wedge angle θ of the spacer rod 32 is fixed, the self-standing posture does not fluctuate or become unstable, and the emission direction of the sound emitted by each planar speaker 21 is limited. Good sound field reproduction is possible by adopting an appropriate wedge angle according to the application. Also,
A pad 33 is fixed to the lower side portion of the support frame 23 of each flat speaker 21 as a slip stopper for self-standing. However,
Even if the pad 33 is omitted, the reaction force generated when the vibrator 24 vibrates the vibrating membrane 22 is canceled between the pair of flat speakers 21, so that the self-sustained placement position is displaced due to vibration. There is no inconvenience. In addition, in order to reduce the load applied to the spacer rod 32, as shown by the dotted line in FIG.
It is also possible to arrange a tie rod 34 that connects the ends of the bottom portion of 3 to strengthen the structure in a self-supporting posture.

The vibrating membrane 22 of the flat speaker 21 is, for example, PEN (polyethylene naphthalate), PET (polyethylene terephthalate), a metal vapor-deposited material thereof, or a material such as carbon fiber covering a front surface of the support frame 23. A shaped film is used. That is, by using a synthetic resin material suitable for film processing or a synthetic fiber material having a high tensile strength as the vibration film 22, stable vibration characteristics can be maintained for a long period of time. Particularly, when a film material having high tensile rigidity such as metal-deposited PEN or PET is used, stable vibration characteristics with almost no deterioration over time can be constantly maintained. In this embodiment, the upper and lower sides and the left and right sides of the heat-shrinkable quadrangular vibrating membrane 22 are fixed to the support frame 23 by bonding, and heat is applied to the entire vibrating membrane 22 after the bonding and fixing so that the vibrating membrane 22 is vertically and horizontally oriented. It is configured to give tensile tension.

More specifically, the vibrating membrane 22 is formed by cutting a film material such as PET having a heat shrinkage property in a specific uniaxial direction, and the two opposite sides of the film material are 0 ° to 90 ° (however). The film material is cut so as to obtain the vibrating membrane 22 having upper and lower sides and left and right sides that are parallel to two orthogonal orthogonal axes that are obliquely intersected at an oblique angle. Since the vibrating membrane 22 obtained by cutting has the heat shrinking direction substantially in the diagonal direction, the upper and lower sides and the left and right sides of the vibrating membrane 22 are adhered and fixed to the support frame 23, and then the flat panel heater, the warm air blower, or the infrared heater. The vibrating membrane 22 is heated using the above.
As a result, the vibrating membrane 22 tries to contract in the diagonal direction, and therefore, as a biaxial component force of the tensile tension in the diagonal direction,
A tensile tension is applied in the vertical direction and the horizontal direction, and the vibrating membrane 22 is strained.

The difference in acoustic characteristics based on the difference in shape between the square diaphragm 22 and the circular diaphragm (not shown) is clear. That is, since the distance from the point sound source to the peripheral portion varies depending on the azimuth, the square-shaped diaphragm 22 has a single shape like a circular diaphragm in which the distance from the point sound source to the peripheral portion is the same in all directions. It does not exhibit a resonance characteristic that it resonates remarkably at frequencies, and has a large number of resonance frequencies. Therefore, the rectangular vibration film 22 is
It has a sufficiently wide reproduction frequency band compared to a circular diaphragm. By intentionally shifting the heat shrinkage direction of the film material from the diagonal direction of the vibrating film 22, the vertical tensile tension applied to the upper and lower sides and the lateral tensile tension applied to the left and right sides are made independent of each other. By adjusting with the above, the desired frequency characteristics can be freely realized, and many advantages derived from the film shape can be effectively utilized for the acoustic effect.

As shown in FIG. 3, the vibrator 24 of the flat speaker 21 has a piston plate 2 at the center of the back surface of the vibrating membrane 22.
5a, one end of which is in contact with the voice coil 25, a caldera volcano-shaped yoke 26 having an inverted E-shaped cross section coaxially disposed on the other end of the voice coil 25, and an annular portion of the yoke 26. Ring magnet 27 sandwiched in the middle
And a damper 28 that connects the side surface of the voice coil 25 and the end of the yoke 26. The vibration exciter 24 is configured to thoroughly improve the efficiency by strengthening the magnetic force, minimizing the magnetic gap, reducing the friction of the damper, etc.
When a voice current is applied to the voice coil 25 in the magnetic field formed by the ring-shaped magnet 27 along the line 6, the voice coil 2 is generated by the Fleming force generated in the voice coil 25.
5 vibrates in the axial direction, and the piston plate 25a is driven in the front-rear direction.

Further, the piston plate 25a is not adhered to the vibrating membrane 22, but is simply brought into contact with the central portion of the rear surface of the vibrating membrane 22. Therefore, the vibrator 24 needs to be separately held on the back surface side of the vibrating membrane 22. Therefore, in the present embodiment, the stay rod 29 is bridged between the central portions of the left and right sides of the support frame 23, and the vibrator 24 is fixed to the central portion of the stay rod 29. Thus, the vibrator 24 is pressed and held at the center of the back surface of the vibrating membrane 22. A skew adjusting mechanism (not shown) for adjusting the swinging angle of the vibrator 24 with respect to the stay rod 29 is incorporated in the central portion of the stay rod 29 so that the axis of the voice coil 25 can be adjusted orthogonally to the vibrating membrane 22. is there. Support frame 23
After the assembling of the vibrating membrane 22 with respect to the above, the both ends of the stay rod 29, to which the vibrator 24 is fixed in the central portion, are screwed and fixed to the rear surface of the support frame 23. In that case, the piston plate 25a at the tip of the voice coil 25 of the vibrator 24 contacts the center of the back surface of the vibrating membrane 22, but since the vibrating membrane 22 itself is pulled vertically and horizontally, the portion where the piston plate 25a abuts. It is advisable to assemble the vibrating membrane 22 with a pressing force that causes a displacement of about 1/2 of the maximum amplitude. Moreover, since the swing angle of the vibrator 24 with respect to the stay rod 29 can be freely adjusted by the skew adjustment mechanism, an adjustment jig (not shown) or the like is used to move the piston plate 25a in a direction perpendicular to the vibrating membrane 22. Can be adjusted to vibrate.

When the voice current is applied to the voice coil 25, the flat speaker 21 having the above structure generates a Fleming force according to the magnitude of the current and the number of coil turns, and the piston plate 25a causes the vibrating membrane 22 to move in the front-back direction. Sound pressure is generated by being driven by a piston, but the vibrating membrane 22 itself is given tension and is tense, and vibrates with a slight pressing driving force. Therefore, it is sufficient to supply a minute driving current. Pressure can be generated. Therefore, for example, A4
With the vibrating membrane 22 having an area of about a size, the output signal of the headphone output terminal can be directly energized and driven to the voice coil 25 without passing through the amplifier. According to the experimental results, the vibrating membrane 2 to which tensile tension is applied
It is known that the sound pressure improving effect of 2 exceeds several dB, and by combining the sound pressure improving effect of about several dB with the combined use of the high-sensitivity shaker 24, the flat speaker 21 as a whole has a sound pressure of 10 dB.
It is possible to improve the sound pressure by about several dB.

Specifically, in the case of a conventional free-edge type flat speaker, 1.2 W for amplifying headphone output.
The flat speaker 21 that drives the diaphragm of A6 size that has been driven through the power amplifier of the output level with tension applied to the diaphragm 22 can be directly driven by headphone output, and can be obtained. It has been confirmed that the reproduced sound has the same sound pressure, frequency characteristics, and distortion. Further, in the case of the conventional free-edge type flat speaker, the diaphragm of A3 size, which is driven through the power amplifier of about 10 W output which amplifies the headphone output, is the diaphragm 2 as well.
The flat speaker 21, which is driven with the tension applied to 2,
It has been confirmed that the headphone output can be amplified and driven by a power amplifier of about 1W output that can drive about 4 AA batteries, and power supply cordless drive that does not require external power supply to a flat speaker is possible. .

In the flat panel speaker system 31 shown in the above embodiment, the pair of flat panel speakers 21 are attached to the support frame 2.
The spacer rod 32 for connecting the 3 together provides a predetermined wedge angle θ.
However, in order to make the coupling posture of the two planar speakers 21 stronger, for example, like the planar speaker system 41 shown in FIG. 4A, a pair of exciters 24 are trapezoidal in cross section. It is also possible to connect by a connecting frame 42 formed of a hollow cylinder made of a rigid body. In this planar speaker system 41, the positional relationship between the pair of vibrators 24 is fixed by the coupling frame 42, so the vibrator 2
It is possible to surely cancel the reaction force generated by the vibration of the vibrating membrane 22 caused by No. 4 or vibrations and flicker generated by such a reaction force, and it is possible to perform stable self-standing placement and sound field reproduction.

Further, the shape of the connecting means for connecting the vibration exciters 24 is not limited to the above-mentioned connecting frame 42, and for example, FIG.
As in the planar speaker system 43 shown in (B), a bridging portion 44a that branches in a Y shape and bridges the vibrators 24 with each other.
Also, the coupling frame 42 can be substituted by using the coupling stand 44 including the column portion 44b that supports the bridge portion 44a and the disk-shaped pedestal portion 44c in which the lower end of the column portion 44b is planted. In this coupling stand 44, since the pedestal portion 44c located directly below the wedge supports the weight of the support frame 23 together with the pad 33, the stability of the mounting posture of the flat speaker system 43 is very high, and the reproduction sound pressure level is high. Even in such a case, the occurrence of flicker can be surely suppressed. In addition, the coupling stand 44 is a flat speaker system 4
Since the position of the center of gravity of 3 is supported, flicker can be prevented even if the pad 33 takes a mounting posture such that it is floating from the mounting surface.

Further, in the flat panel speaker systems 31, 41, 43 shown in the above embodiment, the pair of flat panel speakers takes a self-standing posture according to the apex angle θ of the spacer rod 32, so that the wedge angle θ is fixed. However, as in the flat speaker system 51 shown in FIG. 5, by assembling the pair of flat speakers 21 using the hinges 52 so that the legs can be freely opened and closed,
It is possible to freely adjust the wedge angle θ when taking the self-standing posture. As shown in FIG. 6, the flat speaker system 51 has a pair of hinges 52 arranged near the left and right ends of a rod 53 having a circular cross section, and serves as an opening / closing door portion that constitutes each hinge 52. A pair of clasps 52a, 52b
Are screwed in correspondence with the upper side portions of the support frame 23 of the respective flat speakers 21. Therefore, the flat speaker system 51 has a pair of clasps 52 that form a hinge 52.
By adjusting the angle formed by a and 52b, it is possible to freely adjust the wedge angle θ formed by the pair of flat speakers 21 in the self-standing state. Therefore, by freely selecting the wedge angle θ according to the characteristics of the sound field to be reproduced or the reproduction space, it is possible to respond flexibly.

Further, it is not always necessary to apply the same signal component to the pair of flat panel speakers 21 shown in the above embodiment to drive them, as in the flat panel speaker system 71 shown in FIGS. 7 (A) and 7 (B). One flat speaker 21 may be driven for medium and high frequency reproduction, and the other flat speaker 21 may be divided into bands for driving low frequency reproduction. In the case of this example, since the flat speaker 21 for low frequency reproduction is placed with the vibrating membrane 22 lying on the mounting surface or with a slight gap, the flat speaker 21 for middle and high frequency reproduction is slightly tilted backward. Stand up. In this case, the low-pitched sound generated by the flat speaker 21 for low frequency reproduction is generated by the flat speaker 2 for middle and high frequency reproduction.
Since it is easier to wrap around to the back of the object compared to the mid-high range sound emitted by 1, the vibrating membrane 22 vibrating near the mounting surface does not hinder low-frequency reproduction, and the mid-low range sound with high straightness is slightly backward tilted. Since the front flat speaker 21 emits light, the sound field can be reproduced well. Thus, the flat speaker 21 for middle and high frequency reproduction and the flat speaker 2 for low frequency reproduction
A self-supporting 2-way flat speaker system 71 in which 1 and 1 are combined is obtained. The pair of flat speakers 21
It is desirable that they are connected by a hinge or similar connecting means so that the wedge angles θ of them can be adjusted arbitrarily.

Further, the flat speaker system 71 is
The flat speaker 21 for low frequency reproduction is placed on the mounting surface for use. However, as in the flat speaker system 81 shown in FIGS. 8A and 8B, the flat speaker 21 for low frequency reproduction is used. It is also possible to assemble the flat speaker 21 on the ceiling surface and use the flat speaker 21 for reproducing the middle and high frequencies by hanging it from the ceiling surface. In this case as well, it is desirable to couple the pair of flat speakers 21 with a hinge or similar coupling means so that the hanging angle of the flat speaker 21 for reproducing the middle and high frequencies with respect to the ceiling surface can be arbitrarily adjusted.

Furthermore, as in the flat speaker system 91 shown in FIG. 9A, a flat speaker for middle and high frequency reproduction is divided into left and right, and a flat speaker 21L on the left side faces the middle and high frequency reproduction of the left channel of the stereo signal. It is also possible to divide the flat speaker 21R on the right side toward the mid-high range reproduction of the right channel of the same stereo signal. In this case, by applying the low-frequency component of the audio signal obtained by combining the left and right channels to the other low-frequency reproduction planar speaker 21, 3D (3-dimensional) reproduction is possible in the entire planar speaker system 91. In the present embodiment, as shown in FIG. 9B, the left channel audio signal is amplified by the speaker drive amplifier 21a composed of a non-inverting amplifier, and the left channel mid-high range reproduction is performed via the low range cutoff capacitor CL. And the right channel audio signal is amplified by the speaker drive amplifier 21b which is an inverting amplifier and is supplied to the right channel flat speaker 21R for low-frequency midrange reproduction through the low-frequency cutoff capacitor CR. The flat speaker 21 for low-frequency reproduction is connected in series between the speaker drive amplifiers 21a and 21b together with the high-frequency cutoff inductor I, and low-frequency reproduction is performed by monaural sound in which left and right channels are combined. Thus, the flat speaker system 91 can perform 3D reproduction extremely simply simply by combining the pair of speaker drive amplifiers 21a and 21b, the auxiliary circuit including the low-frequency cutoff capacitors CL and CR, and the high-frequency cutoff inductor I. You can

Further, in order to further enhance the compactness of carrying the portable device, for example, as in the flat speaker system 101 shown in FIGS. 10A and 10B, the boundary between the flat speakers 21L and 21R for middle and high frequency reproduction of the left and right channels. Can also be formed by the frets 102. In the case of the present embodiment, the vibrating surfaces of the flat speakers 21L and 21R for reproduction in the middle and high frequencies are formed by a single vibrating film which is obtained by pressing the fret 102, which is a small diameter cylinder, from the back surface side and dividing the fret 102 into two. The flat speaker system 101 also supports the support frame 23 of both flat speakers 21 and 21L and 21R that are openably and closably coupled by a coupling means such as a hinge when folded as shown in FIG. 10B. The vibrating device 24 is extended by a stay rod 24a extending in a direction crossing the vibrating surface so that a total of three vibrating devices 24 are alternately accommodated inside the frame 23.
I support you. For this reason, the frets 102 are located on the back side of the vibrator 24 for driving the low frequency range, and when compared with the configuration in which the flat speakers 21L and 21R for middle and high frequency reproduction of the left and right channels are divided by the support frame, Fret 10
It is excellent in compactness when folded by the difference in wall thickness of 2.

In order to further enhance the compactness of carrying the portable device, for example, as in the flat speaker system 103 shown in FIGS. 11A to 11C, the boundary between the left and right flat speakers 21L and 21R for middle and high frequency reproduction. The width of the part is widened, and the vibrator 24 of the flat speaker 21 for low frequency reproduction is used.
It is also possible to provide a gap 23a for accommodating the. In this case, when the support frames 23 of the two flat speakers 21 and 21L, 21R, which are openably and closably coupled by a coupling means such as a hinge, are folded as shown in FIG. 11 (A), as shown in FIG. 11 (C). In addition, a total of three vibrators 24 are alternately accommodated inside the support frame 23, and the rear surface of the vibrator 24 for driving the low frequency range has a flat speaker 21 for reproducing the middle and high frequencies.
Since it is flush with the vibration planes of L and 21R, it can be in the most compact folding posture, and the whole body is not bulky, which makes it easy to carry.

Furthermore, the above flat speaker system 9
1 or 101, 103 is one flat speaker 21
L and 21R correspond to the left and right channels and are used for middle and high frequency reproduction, and the other flat speaker 21 is used for low frequency reproduction of the left and right composite channels of stereo signals. It is also possible to assign the vibrating surface for the mid range reproduction and the high range reproduction. In this case, a three-way single-channel playback speaker system can be configured together with the low-frequency playback of the other flat speaker. Therefore, by arranging the speaker systems separately on the left and right sides, high quality is achieved. Stereo playback is possible.

Further, in any of the above-mentioned embodiments, the flat speaker system 31, 41, 51, 71, 81, 91, 101, 10 having a structure using at least two vibrating membranes 22 is used.
3 has been described as an example, but as in the flat speaker system 111 shown in FIGS. 12A, 12B, and 12C, the common upper side portion of the pair of support frames 23 is constituted by the frets 114, and a single fret 114 is formed. It is also possible that both ends of the vibrating membrane 112 are stretched on a half-folded support frame 113 and the central portion of the vibrating membrane 112 is supported by the frets 114. The rectangular support frame 113 that is folded in two in a wedge shape has the frets 114 bridged by connecting the folds of the two folds, so that the peripheral edge portion is the support frame 11.
The vibrating surface of the vibrating membrane 112 fixed to the No. 3 has a fret 114
It is divided into two by. That is, it is possible to substantially configure the pair of flat speakers 121 by using the single vibrating membrane 112, and it is possible to reduce the manufacturing cost and simplify the manufacturing process. In addition, the support frame 113 folded in two
Is preferably configured so that the opening / closing angle can be adjusted at both ends of the fret 114.

Further, the flat panel speaker system 111 shown in the above embodiment does not necessarily need to be driven by applying the same signal component to the flat panel speaker 121.
As in the flat speaker system 131 shown in (A) and (B), one flat speaker 121 is used for middle and high frequency reproduction,
It is also possible to drive the other flat speaker 121 by dividing it into bands for low frequency reproduction. In the case of this example, since the flat speaker 121 for low frequency reproduction is placed with the vibrating membrane 112 lying on the mounting surface or with a slight gap, the flat speaker 121 for middle and high frequency reproduction is slightly tilted backward. Stand up. In this case, the flat speaker 12 for low frequency reproduction
The low-pitched sound emitted from the 1 is a flat speaker 121 for reproducing the mid-high range.
Since it is easier to wrap around to the back of the object compared to the mid-high range sound emitted by the sound source, there is no problem in low-frequency reproduction due to the vibrating membrane 112 vibrating near the mounting surface. Since the flat speaker 121 irradiates the sound to the front, good sound field reproduction is possible. In this way, the self-supporting 2-way flat speaker system 131 in which the flat speaker 121 for middle and high band reproduction and the flat speaker 121 for low band reproduction are combined can be obtained.

The flat speaker system 131 described above is also provided.
The flat speaker 121 for low frequency reproduction is mounted on the mounting surface for use. However, as in the flat speaker system 141 shown in FIGS. 14A and 14B, a flat speaker for low frequency reproduction is used. It is also possible to assemble the speaker 121 on the ceiling surface and use the flat speaker 121 for mid-high frequency reproduction by hanging it from the ceiling surface. In this case as well, it is desirable to couple the pair of flat speakers 121 with a coupling means capable of adjusting the angles so that the hanging angle of the flat speaker 121 for reproducing the middle and high frequencies with respect to the ceiling surface can be arbitrarily adjusted.

The flat speaker system 111,
Although 121 and 131 are used by setting the wedge angle formed by the pair of flat speakers at an acute angle, the wedge angle is set to an obtuse angle as in the flat speaker 141 shown in FIG. 15 (A), or as shown in FIG. 15 (B). As in the flat speaker 151 shown, the wedge angle can be set to a right angle. Specifically, in the flat panel speaker system 141, a housing 142 with holes is arranged along the vibrating surface of a pair of flat speaker 121 that is obtusely divided by the fret 114 and is divided into two, and the vibrating surface is covered. The housing 142 is, for example, a flat speaker system 1
This is a casing of a display pedestal in which 41 is incorporated, and in the case of this example, a plurality of holes for transmitting radiated sound are formed in a curved portion having a parabolic curved surface. Although the curved shape of the housing 142 is originally designed arbitrarily according to the required specifications and aesthetics, the flat speaker system 141 capable of forming an arbitrary obtuse angle with the fret 114 interposed therebetween can meet a wide range of design requirements. Since it has a high adaptability, it is possible to provide a highly flexible design environment in which the internal space of the housing 142 can be used effectively.

Similarly, in the flat panel speaker system 151 shown in FIG. 15B, the housing 152 with holes is arranged along the vibrating surface of the pair of flat panel speakers 121 which are divided into two by the fret 114 at a right angle. , The vibration surface is covered.
The housing 152 is, for example, a flat speaker system 151.
Is a casing of a personal computer main body, a television receiver, or the like in which the above is incorporated, and in this example, a plurality of holes for transmitting radiated sound are formed in a casing portion that is bent at a right angle. The curved shape of the housing 152 is also arbitrarily designed in view of the required specifications and aesthetics,
The flat speaker system 151, which can easily form a right angle with the frets 114 sandwiched, has a high adaptability capable of meeting a wide range of design requirements, and has a degree of freedom to maximize the effective use of the internal space of the housing 152. It is possible to provide a high design environment.

Further, in each of the above-mentioned embodiments, the vibrating membrane 22 or 112 is fixed to the support frame 23 or 113 by adhesion, and then the entire vibrating membrane 22 or 112 is heated to generate tensile tension by thermal contraction. Although the flat speaker 21 or 121 is taken as an example, the vibrating membrane can be attached to the support frame by other methods. For example, the four sides of the vibrating membrane are temporarily fixed to a support frame, and are linearly heat-welded along the inner circumference of the four sides by a laminator, etc. You can also give. Alternatively, for example, an engaging groove is formed in the support frame, and the peripheral edge of the vibrating membrane is locked in the engaging groove by a clip rod or a clip frame engaging with the engaging groove, and a clip for the engaging groove is formed. The tension applied to the vibrating membrane can be adjusted according to the engagement depth of the frame. Alternatively, although it is a simpler method, a long hole is formed in the peripheral portion of the vibrating membrane, and the vibrating membrane is fastened and fixed to the support frame with a tightening screw that inserts the long hole, and the inserting position of the tightening screw into the long hole It is also possible to apply a tension corresponding to.
Further, the support frame may be a stretchable structure in which the connecting distance of each side can be adjusted, and the tension applied to the vibration film can be variably adjusted by changing the size of the support frame itself on which the vibration film is stretched.

In the above description, a quadrilateral planar speaker is used as an example of the planar speaker constituting the planar speaker system. However, the planar speaker system is configured by using a triangular or pentagonal or more polygonal planar speaker. Good.

[0038]

As described above, according to the present invention,
A pair of flat speakers, which vibrate and drive a vibrating film stretched on a polygonal support frame by vibrating means supported by the support frame, are connected to each other by partially connecting each of the support frames, and the pair of support frames are formed into a wedge shape. Since it is configured to be self-supporting in a slanted mounting posture, it is possible to position the wedge directly above or to the side of the mounting surface without using a speaker stand, easel, or mounting hardware. Since a pair of flat speakers can be placed, and each flat speaker has a vibrating film stretched around a support frame, it is possible to use a conventional flat speaker that supports the vibrating film only by vibrating means fixed to the support frame. In contrast, the damper in the vibrating means does not need strength, the damper does not hinder the light movement of the movable part, and there is no posture deviation when the vibrating means is brought into contact with the vibrating membrane. Inside the vibration means Not necessary to secure an axis inclined room for moving parts, thereby a magnetic gap in the vibrating means minimized, it is possible to improve the magnetic efficiency to the limit,
In this way, the vibrating membrane that applies tensile tension can be used as a sufficient vibration source while being lightweight, and can generate a sufficient volume with a slight driving force, and can be directly connected to the headphone output terminal attached to audio equipment or video equipment. As it can be driven directly, it is a portable type A that does not require a special power amplifier.
It is suitable for a speaker for V equipment, and since the vibrating membrane is supported by the support frame in a tensioned state, it basically changes with the use progress like a conventional flat speaker whose peripheral portion is a free end. The hygroscopic effect does not impair the flat shape, the piston vibration is not expected and the reproduced sound is not impaired, and high-quality reproduction characteristics can be constantly maintained. The polygonal vibration film whose distance to the part changes depending on the azimuth has a large number of resonance frequencies, unlike the circular vibration film in which the distance from the driving point at the center of the back surface to the peripheral edge is the same in all directions. When using a vibrating membrane with a sufficiently wide reproduction frequency band and a polygonal shape with even sides such as quadrangle and hexagon, individually adjust the tensile tension applied to the diagonal side. The desired frequency characteristics can be achieved, and when using a polygonal vibrating membrane with an odd number of sides such as triangles and pentagons, the tension in the direction connecting the apex and the opposite side must be individually adjusted. Due to
It has excellent effects such as achieving desired frequency characteristics.

Further, since the connecting means includes spacer rods having wedge-shaped cross-sections, one side of each supporting frame being fixed to the left and right side surfaces, the supporting frames can be made to stand by themselves at the wedge angle of the spacer rods. Since the angle is fixed, the self-standing posture does not fluctuate or become unstable, and the sound emission direction is limited, but by adopting an appropriate wedge angle according to the application, good sound can be obtained. It has the effect of being able to reproduce the field.

Further, since the connecting means includes a connecting frame for connecting the pair of vibrating means and fixing the positional relationship of the pair of vibrating means, the vibrating means vibrates the vibrating membrane. With this, it is possible to reliably cancel the reaction force generated due to the vibration, the vibration or the flicker generated by the reaction force, and it is possible to achieve a stable self-standing posture and sound field reproduction.

Further, since the connecting means includes a hinge having a pair of opening / closing door portions to which one side of each of the supporting frames is fixed, the angle of the wedge formed by the pair of supporting frames is set to the angle of the opening / closing door portion of the hinge. According to the characteristics of the sound field to be reproduced or the characteristics of the reproduction space, the wedge angle can be freely adjusted, so that it is possible to freely respond.

Further, since the pair of flat speakers is used for reproducing the mid-high range and the other for the low-range reproduction, a self-supporting two-way speaker system can be easily configured, and the low-pitched sound is medium. Since it has a stronger tendency to wrap around behind an object than treble sounds, a flat speaker for low-frequency reproduction is installed facing the mounting surface or ceiling surface, and a flat surface for mid- and high-frequency reproduction that emits strong straight-line sounds in the middle and high frequencies. By erecting the speaker toward the front, it is possible to achieve good sound field reproduction in which the low frequency range and the mid and high frequency range are antagonized.

In the pair of flat speakers, one flat speaker divides the vibrating surface into two parts, and the divided individual vibrating surfaces are used for mid-range reproduction or high-range reproduction or mid-high range reproduction, and the other flat-type speaker is used. Since it is used for low frequency reproduction, one plane speaker is made to correspond to the left and right channels and the vibrating surface is divided into two for middle and high frequency reproduction, and local areas are used for low frequency reproduction of the left and right composite channels of the stereo signal. Thus, a pair of flat speakers combined in a wedge shape provides 3D (3
(3D) reproduction is possible, the space occupied by the speaker system required for stereo sound reproduction can be minimized as much as possible, or the individual vibration surface of one flat speaker whose vibration surface is divided into two is played in the middle range. It is also possible to configure a 3-way single-channel playback speaker system in combination with the low-frequency playback of the other flat speaker by allocating it for audio and high-frequency playback. By doing so, effects such as high-quality stereo reproduction are possible.

Further, since the one flat speaker has a vibrating surface obtained by dividing a single vibrating film into two by frets, when the back surfaces of the pair of flat speakers are superposed so that the wedge angle becomes zero. , The difference in wall thickness between the support frame and the frets when compared with the configuration in which the vibrating membrane of one flat speaker is divided by the support frame by locating the frets on the back side of the vibrator for the other flat speaker. Only when it is folded, the compactness can be improved.

Further, since the dividing boundary of the one flat speaker in which the vibrating surface is divided into two is formed by a gap which is equal to or larger than the width of the vibrator for the other flat speaker, the pair of flat speakers has a wedge angle of zero. When the back surfaces are overlapped with each other so that the vibrating device of the other flat speaker can be housed in the dividing boundary portion of the vibrating surface of the one flat speaker,
As a result, there is an effect that the compactness in portability can be remarkably improved.

According to a ninth aspect of the flat speaker system of the present invention, a polygonal support frame is folded in two in a wedge shape, and the frets are bridged by connecting the folds. The support frame is stretched over the support frame. Since it comprises a vibrating film whose vibrating surface is divided into two parts and a pair of vibrating means which is supported by the support frame and individually vibrates and drives the two vibrating film parts, a single vibrating film is used. It is possible to substantially configure a pair of flat speakers, and this brings about effects such as reduction of manufacturing cost and simplification of manufacturing process.

Further, one of the two-divided vibrating membranes is used for middle and high range reproduction, and the other is used for low range reproduction. Therefore, a self-supporting two-way system speaker system can be easily constructed, and low-pitched sound is produced. Has a property of wrapping around behind an object more strongly than mid-high frequencies, so a flat speaker for low-frequency reproduction is installed facing the mounting surface or ceiling surface, and for mid-high frequency reproduction that emits strong mid-high frequency sounds. By arranging the flat speaker of (1) to stand up toward the front, it is possible to achieve good sound field reproduction in which the low frequency range and the mid and high frequency range are antagonized.

[Brief description of drawings]

FIG. 1 is a schematic perspective view showing a first embodiment of a flat speaker system of the present invention.

FIG. 2 is a vertical cross-sectional view of the flat speaker system shown in FIG.

3 is a cross-sectional view of the vibration exciter shown in FIG.

4A and 4B are vertical cross-sectional views showing different modifications of the flat panel speaker system shown in FIG. 1, respectively.

FIG. 5 is a schematic perspective view showing a second embodiment of the flat speaker system of the present invention.

6 is a vertical cross-sectional view of the flat panel speaker system shown in FIG.

7A and 7B are respectively a schematic perspective view and a schematic side view showing another example of use of the flat panel speaker system shown in FIG.

8A and 8B are respectively a schematic perspective view and a schematic side view showing a different usage example of the flat panel speaker system shown in FIG.

9A and 9B are respectively a schematic perspective view showing another modification of the flat panel speaker system shown in FIG. 1 and a circuit diagram showing an example of an auxiliary circuit.

10A and 10B are respectively a schematic perspective view and a cross-sectional view showing a modification of the flat panel speaker system shown in FIG.

11 (A), (B), and (C) are a side view, a schematic perspective view, and a cross-sectional view, respectively, showing another modification of the flat panel speaker system shown in FIG.

12 (A), (B), and (C) are a schematic perspective view, a vertical sectional view, and a schematic exploded perspective view showing a third embodiment of the flat speaker system of the present invention, respectively.

13A and 13B are a schematic perspective view and a schematic side view showing another usage example of the flat panel speaker system shown in FIG. 12, respectively.

14A and 14B are respectively a schematic perspective view and a schematic side view showing a different usage example of the flat panel speaker system shown in FIG.

15A and 15B are schematic side views showing other different usage examples of the flat panel speaker system shown in FIG. 12, respectively.

FIG. 16 is a vertical sectional view showing an example of a conventional flat speaker system.

[Explanation of symbols]

21, 21L, 21R Flat speaker 22 Vibrating membrane 23 Support frame 23a Gap 24 Exciter 25 Voice coil 25a Piston plate 26 Yoke 27 Annular magnet 28 Damper 29 Stay rod 31, 41, 43, 51, 71, 81, 91, 101 ，
103, 111, 131, 141, 151 Flat speaker system 32 Spacer rod 33 Pad 42 Coupling frame 44 Coupling stand 52 Hinges 52a, 52b Clasp 53 Rod 102, 114 Fret 112 Vibrating membrane 113 Support frame 121 Planar speaker

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ identification code FI H04R 9/06 H04R 9/06 A (58) Fields investigated (Int.Cl. ⁷ , DB name) H04R 1/00 310 H04R 1 / 34 310 H04R 1/40 310 H04R 5/02 H04R 7/04 H04R 9/06

Claims (10)

(57) [Claims] 1. A pair of flat speakers that vibrate and drive a vibrating film stretched on a polygonal support frame by vibrating means supported on the support frame, and a part of each of the support frames of the pair of flat speakers. And a coupling means for connecting the pair of support frames to each other so as to be self-standing in a mounting posture in which the pair of support frames are obliquely crossed with each other in a wedge shape. 2. The flat speaker system according to claim 1, wherein the coupling means includes a spacer rod having a wedge-shaped cross section, in which one side of each of the support frames is fixed to left and right side surfaces. 3. The plane according to claim 2, wherein the coupling means includes a coupling frame that couples the pair of vibration means to each other and fixes a positional relationship between the pair of vibration means. Speaker system. 4. The flat panel speaker system according to claim 1, wherein the coupling means includes a hinge having a pair of opening / closing door portions to which one side of each of the support frames is fixed. 5. The flat panel speaker system according to claim 1, wherein one of the pair of flat panel speakers is for middle and high range reproduction, and the other is for low range reproduction. 6. The pair of flat speakers, wherein one flat speaker has a vibrating surface divided into two, and each of the divided vibrating surfaces is used for mid-range reproduction or high-range reproduction or mid-high range reproduction.
2. The flat speaker system according to claim 1, wherein the other flat speaker is used for low frequency reproduction. 7. The flat speaker system according to claim 6, wherein the one flat speaker has a vibrating surface obtained by dividing a single vibrating film into two by frets. 8. The one flat speaker in which the vibrating surface is divided into two has a division boundary formed by a gap having a width equal to or larger than a width of an exciter for the other flat speaker.
The flat speaker system described. 9. A polygonal support frame that is folded in two in a wedge shape and bridges frets by connecting folds, a vibrating membrane that is stretched on the support frame, and has a vibrating surface divided into two parts by the frets, and the support. A flat speaker system comprising: a pair of vibrating means supported by a frame and individually vibrating and driving the vibrating membrane divided into two parts. 10. The flat panel speaker system according to claim 9, wherein one of said two-divided vibrating membrane is for middle and high range reproduction, and the other is for low range reproduction.