JP2012175473A - Speaker device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technology capable of improving sound quality of a speaker device.SOLUTION: As vibrations between speakers, actions and counter-actions are offset, and as a common sound chamber, it is constituted to isolate cabinet vibrations by arranging a plurality of speaker units close in the same or opposite direction and by driving them so that a rear sound of outside sound speakers and a rear sound of internal speakers form a common sound chamber and they become synchronous. A variable resistor is disposed on each speaker unit to change a frequency characteristic and a sound wave pickup is disposed in the common sound chamber, a vibration pickup is disposed in the rear part of the outside sound speaker unit to match a resistance value at an optimum point of a sound wave correction and a vibration correction.

Description

The present invention relates to a speaker device.

A general speaker device is shown in FIG. 20 using a full-range speaker unit and a sealed box type cabinet. The generation of sound due to the vibration of the speaker unit vibration body, the vibration state of the speaker unit, and the vibration state of the cabinet are shown in the arrow direction. FIG. 21 shows a state in which the vibrating body moves forward with a positive polarity, and FIG. 22 schematically shows the vibration propagation process. In the speaker device, the longitudinal vibration of the vibrating body of the speaker unit due to the magnetic field of the magnet of the speaker unit according to Fleming's left-hand rule and the magnetic field of the voice coil of the speaker unit to which a signal is input is made on the base of a non-vibrating stationary point. This makes it possible to obtain a high-resolution realistic reproduction sound. With respect to this high resolution, there is a background that there is a growing need for high-resolution sound, especially in the era when full high-definition video and images have high resolution.

However, the speaker unit of the speaker device is a vibration generator and is intended to emit sound by vibration of the vibrating body. However, the vibration of the vibrating body must be applied to all surfaces of the speaker frame and cabinet that should be non-vibrating stationary points. The vibration accompanying this occurs, and it is superimposed on the sound generated from the vibrating body of the speaker unit, which has an adverse effect and also directly emits sound from the cabinet. Specifically, along with the generation of the sound of the front air vibration P1 due to the vibration of the vibration body SPa of the speaker unit, the vibration of the speaker frame SPd via the speaker vibration body edge SPc and the damper SPb is generated. The vibration P3 of the front baffle 1a occurs. Further, surplus vibration P4 of the cabinet surfaces 1b, 1c, and 1d is generated by a combination of the air propagation of the rear air vibration P2 due to the vibration of the vibrating body of the speaker unit and the solid propagation of the vibration of the front baffle. Resonance due to cabinet wall reflection is added to these, and the vibration P5 approaches the rear surface of the vibrating body of the speaker unit again, causing the vibrating body SPa to vibrate excessively, and sound passes through the vibrating body SPa. In addition to this, there is the generation of a reverse-phase vibration P6 on the magnet side due to the action and reaction of the vibration of the vibrating body SPa of the speaker unit, which works with a momentum opposite to the longitudinal movement of the vibrating body. By combining these, the loudspeaker apparatus generates sounds including various surplus vibrations, and these cause masking of fine sound and superimposition of distortion sound on the forward air vibration P1 due to vibration of the vibrating body SPa. A comprehensive solution is needed to eliminate all these surplus vibrations.

Here, analysis will be made on the adverse effects of the vibration P5 coming from the cabinet, the adverse effects of the action-reaction vibration P6, and the adverse effects on the vibration of the vibrating body due to the resistance of the air of the cabinet capacity. The additional vibration P5 on the back surface of the vibrating body of the speaker unit due to the sound reflected from the cabinet wall surface and the vibration of the cabinet wall surface is a major factor. In the prior art, as a means for reducing this, two speaker units SP1 shown in FIG. And SP2 are arranged in the front and rear, a common sound chamber 6 is formed and driven in the same phase, and an adverse effect from the cabinet is isolated. Thus, in the common sound chamber 6, not only the rear vibrating body isolates and eliminates the influence from the cabinet, but also the two speakers operate in the same phase. Forms a state that easily vibrates. With the two vibrating bodies moving in the same phase, the common sound chamber enters a noise canceling state when the cabinet vibration is regarded as noise, and at the same time, this state is a back assist state to the vibrating body operation of the front speaker unit by the rear speaker unit. You can also see it. As a result, two of the three adverse effects are directed to a solution if they are manufactured with sufficient consideration for rigidity and vibration suppression. However, in this arrangement, the vibration P6 on the speaker magnet side due to the action and reaction of the vibration of the vibration body of the speaker unit. In addition, since the two speaker units operate in the same direction with respect to the same sound volume, the action reaction vibration P6 increases. As a solution to the vibration due to the action and reaction, there is an arrangement in which the two speaker units are back to back to cancel the vibration. Both the speakers emit sound to the outside (see, for example, Patent Document 1) and one side is released into the cabinet. There is a sound arrangement (for example, see Patent Document 2). If this back-to-back arrangement is made with sufficient consideration for vibration suppression, the reaction-reaction vibration P6 will be directed to the solution direction and will lead to the advancement of fine sound reproduction. However, the additional vibration P5 on the back surface of the vibration body of the speaker unit And the adverse effect of resistance to vibrating body vibration due to the aeroelasticity of the cabinet has not been reduced.

Therefore, there is a proposal shown in FIG. 24 for the purpose of solving both at the same time. Two speaker units are operated back and forth with the same phase polarity to cancel the vibration of the magnet due to the action and reaction, and the sound generated from the rear part of the front speaker unit SP1 is transmitted to the front part of the vibration body of the rear speaker unit SP2. The sound path is diffracted, but a common sound chamber 6 is formed between SP1 and SP2 in the same manner as the front and rear arrangement of the speaker in FIG. 23, and the sound generated in the rear part of the vibrating body of the rear speaker unit SP2 Is led to the cabinet (see, for example, Patent Document 3). The back-to-back cancels the action / reaction vibration P6, isolates the additional vibration P5 by the cabinet due to the formation of the common sound chamber 6, and back assist by the rear speaker unit due to the noise cancellation state of the common sound chamber 6. If it is manufactured with sufficient consideration, it is confirmed that the reality is improved by reproducing fine sounds and playing crisp, clear sounds.

Japanese Utility Model Publication No. 6-77194 JP-A-10-178893 JP 2007-235727 A

The loudspeaker cabinet diffracts the rough air waves of the rear air vibration P2 due to the vibration of the vibrating body to the front and spreads the sound due to the vibration of the vibration air of the loudspeaker unit. It has the capacity and rigidity to prevent it from occurring, and is indispensable. However, the combination of the air propagation of the air vibration P2 behind the vibrating body with the same energy as the sound coming from the front and the solid propagation of the front baffle vibration P3 due to the vibration of the speaker unit itself causes vibration P4 on each side of the cabinet. Along with the failure to make sound from the cabinet, there is a circulation failure that this cabinet vibration is propagated in the air again and additional vibration P5 is generated on the back surface of the vibrating body of the speaker unit. In addition to the first failure due to the cabinet vibration, there is the occurrence of a reverse-phase vibration P6 on the magnet side due to the action and reaction of the vibration of the vibrating body, which is the second failure. Furthermore, the vibration on the back side of the speaker unit's vibrating body, unlike the front, is limited in volume, so there is a third obstacle that the resistance to the vibration due to the elasticity of the air cannot be ignored, resulting in poor distortion and crispness and reduced resolution. linked. As a simultaneous solution, there is a proposal shown in FIG. 24, in which two speaker units are operated back to back with the same phase polarity to cancel the vibration of the magnet due to the action and reaction, and the sound generated in the rear part of the front speaker SP1 is reduced. The common sound chamber 6 is formed by a sound path in front of the vibration body of the rear speaker SP2, and the sound generated from the rear part of the vibration body of the rear speaker SP2 is guided to the cabinet.

For the first and second obstacles that seem to be solved by the structure of FIG. 24, vibration propagation in the speaker unit or the like that occurs at the same time as sound is emitted at the start of the first vibration of the speaker unit shown in FIG. As the number of speaker units increases with respect to the deformation of each place, sufficient rigidity and vibration suppression treatment are important. For creating a noise canceling state against the resistance due to the elasticity of air as a third obstacle, the shorter the distance of the sound path of the two speakers through the common sound chamber 6 is, the shorter the back assist is, the higher the front speaker unit. This is an assist to the vibration of the vibrating body, and this reduces distortion to the front speaker, so the shortness of the sound path is an important viewpoint. In FIG. 24, for example, in the case of a combination of speakers having a diameter of 60 mm, the path of the sound path is 12 cm, whereas the propagation speed of sound in the air is about 340 m per second, and the wavelength is 34 cm at 1 kHz, but up to 1/4 wavelength. Is about 800 Hz at the length of 12 cm, and so far is the effective range of the double drive by the two speaker units in FIG. 24, which limits the effect on the high range. There is a problem that it is necessary to form a shorter sound path in order to exhibit the effect in the high frequency range from at least 1 KHz to a region sensitive to distortion of 2 KHz. Another issue is the problem of using multiple speaker units and one of them inside, because the energy of vibration inside the cabinet increases for the same audio output, so the cabinet vibration increases and reverses. There is a problem that the effect is larger, and in order to solve this problem, it is necessary to show a measure for increasing the damping force or a measure for isolating the vibration.

In order to solve the above-mentioned problems, the invention according to claim 1 is arranged such that a plurality of speaker units are arranged close to each other in the same direction, and are common to the back part of the external sound emitting speaker unit and the back part of the internal speaker unit. A solution means is to form a sound chamber and drive them with opposite phase polarities to lead the front of the internal speaker unit to the cabinet section.

According to a second aspect of the present invention, a plurality of speaker units are arranged adjacent to each other in the same direction, and a common sound chamber is formed between the rear part of the external sound emitting speaker unit and the rear part of the internal speaker unit, thereby having opposite phase polarities. The solution is to guide the front of the internal speaker unit to the cabinet section.

According to a third aspect of the present invention, a plurality of speaker units are arranged with their mounting portions adjacent to each other in opposite directions, and a common sound chamber is formed by the rear part of the external sound emitting speaker unit and the front part of the internal speaker unit. The solution is to drive them with the same phase polarity and to guide the rear part of the internal speaker unit to the cabinet part.

According to a fourth aspect of the present invention, a plurality of speaker units are arranged adjacent to each other in the same direction with the rear part in front, and a common sound chamber is formed between the front part of the external sound emitting speaker unit and the front part of the internal speaker unit from the rear part. It is formed and driven with opposite phase polarities so that the rear side of the internal speaker unit is guided to the cabinet section.

The invention according to claim 5 is the speaker device according to claim 1, wherein two sets of speaker units are arranged inside the speaker device, and a common sound chamber is formed.

According to a sixth aspect of the present invention, there is provided the speaker device according to the second aspect, wherein two sets of speaker units are arranged inside the speaker device, and a common sound chamber is formed.

According to the seventh aspect of the present invention, two pairs of speaker units are arranged back to back, and the back of the four speaker units is a common sound chamber, and the pair is driven with the same phase polarity so that the front in both directions is externally released. The solution is to drive the other pair with the opposite phase polarity to the sound and lead the bidirectional front to the cabinet section.

According to an eighth aspect of the present invention, the speaker unit is further disposed in front of or behind the speaker unit, and is driven so that the vibration direction of the rear speaker unit and the vibrating body are in phase. It is set as a solution means that it is a speaker apparatus as described in above.

The invention according to claim 9 is the speaker means according to any one of claims 1 to 8, wherein the speaker unit is connected by providing a resistor to the speaker unit.

The invention according to claim 10 is the speaker device according to claim 9, wherein either or both of a sound wave pickup and a vibration pickup for the external sound emitting speaker unit are arranged in a common sound chamber formed by a plurality of speaker units. This is the solution.

According to the eleventh aspect of the present invention, all of the surfaces to which the viscoelastic body can be applied, such as the frame surface on the back side of the speaker unit, excluding the vibrating body of the speaker unit, movable parts such as dampers and edges, and parts necessary for mounting are provided. % And more than 40% of the entire area of the entire wall of the cabinet wall, modified silicone, polyurethane viscoelastic sealant, epoxy modified, modified silicone epoxy, urethane The speaker device according to any one of claims 1 to 8, wherein a viscoelastic body layer which is any one of the viscoelastic adhesives or a composite is formed with a thickness of 1 mm or more.

According to a twelfth aspect of the present invention, there is provided the speaker device according to the eleventh aspect, wherein a heavy object is disposed in the vicinity of the speaker unit for external sound emission.

According to the first aspect of the present invention, a plurality of speaker units are arranged adjacent to each other in the same direction, and a common sound chamber is formed between the rear part of the external sound emitting speaker unit and the rear part of the internal speaker unit, and is out of phase with each other. Driving with polarity and guiding the front of the internal speaker unit to the cabinet part realizes a short common sound room, and the adverse effects due to cabinet vibration from the back of the speaker unit are isolated and reduced, and the adverse effects due to action and reaction are also reduced. The back speaker unit is back-assisted to the front speaker unit up to a higher frequency range, and the sound quality of the emitted sound is improved. The back surface of the vibrating body of the front speaker unit and the back surface of the rear speaker unit form a short common sound path, and the front surface of the rear speaker unit is connected to the cabinet, and the vibrations of the two speaker units are connected in series. Alternatively, the reverse-phase connection in parallel and the back-and-forth arrangement cancel the action-reaction vibration because the vibration direction is the reverse direction. In this case, the fact that the two loudspeakers are in the same direction and opposite to each other serves to correct the point that the loudspeaker unit is not always symmetrical due to the movement of the edge. It is confirmed by the good attack and tone quality of the piano sound on the audibility that the adverse effect from the back side of the speaker unit of the external sound emission is reduced from three points of reduction of action reaction vibration, cabinet isolation and back assist. Is done. The evaluation of sound quality is the most rigorous, and the timbre, reverberation, localization and depth are combined to detect subtle differences while comparing with the actual acoustic instrument.

According to the second aspect of the present invention, a plurality of speaker units are arranged adjacent to each other in the same direction, and a common sound chamber is formed between the rear part of the external sound emitting speaker unit and the rear part of the internal speaker unit, and is in opposite phase to each other. Driving with polarity and guiding the front of the internal speaker unit to the cabinet part realizes a short common sound room, and the adverse effects due to cabinet vibration from the back of the speaker unit are isolated and reduced, and the adverse effects due to action and reaction are also reduced. The back speaker unit is back-assisted to the front speaker unit up to a higher frequency range, and the sound quality of the emitted sound is improved. These two speaker units are simply put in one small box, one is sounded externally, and the other is led to the cabinet. Strongly realizable. However, the cancellation of the action / reaction vibration is not on a straight line, so a rotational moment is generated. However, it can be improved by placing a heavy object.

According to a third aspect of the present invention, a plurality of speaker units are arranged with their mounts adjacent to each other in opposite directions, and a common sound chamber is formed by the rear part of the external sound emitting speaker unit and the front part of the internal speaker unit. By driving with the same polarity of each other and guiding the rear part of the internal speaker unit to the cabinet part, a short common sound chamber is realized, and the adverse effects due to cabinet vibration from the rear of the speaker unit are isolated and mitigated, and adverse effects due to action and reaction Is reduced and back assisting the front speaker unit by the rear speaker unit up to a higher frequency range improves the sound quality of the emitted sound. This is an arrangement in which a small box is placed in front of a conventional speaker device and sound is emitted from another speaker unit in the reverse direction. The speaker unit is driven in the same phase, but the arrangement is in the reverse direction. It is offset and the common sound path is short. The cancellation of the action-reaction vibration is not on a straight line, so a rotational moment is generated, but it can be improved by placing a heavy object.

According to the invention of claim 4, a plurality of speaker units are arranged adjacent to each other in the same direction with the rear part in front, and a common sound chamber is provided between the front part of the speaker unit for external sound emission from the rear part and the front part of the internal speaker unit. By driving with opposite phase polarity and driving the rear of the internal speaker unit to the cabinet part, a short common sound chamber is realized, and the adverse effects caused by cabinet vibration from the rear of the speaker unit are isolated and reduced The adverse effect due to the reaction is also reduced, and the rear speaker unit is back-assisted by the rear speaker unit up to a higher frequency range to improve the sound quality of the emitted sound. With the arrangement of the two speaker units, the formation of a common sound chamber with a short distance and the cancellation of the action and reaction can be structurally realized with a simple structure. However, the cancellation of the action / reaction vibration is not on a straight line, so a rotational moment is generated. However, it can be improved by placing a heavy object. In addition, since the sound unit is externally sounded from the rear part with the speaker unit disposed in the reverse direction, vibration suppression by the speaker frame part viscoelastic body is sufficiently required.

According to the invention described in claim 5, the speaker device according to claim 1, wherein two sets of speaker units are arranged in the speaker device so as to form a common sound chamber, is due to cabinet vibration and reflection of sound in the cabinet. In order to further isolate the surplus vibration, the common sound chamber is increased to three stages, and at the same time, the counteract vibration is canceled. At this point, the influence of the cabinet is almost eliminated, the back assist to the vibration of the sound emitting speaker unit is further improved, and a clear sound with good rise is obtained. In implementation, it is necessary to pay attention to the suppression of the vibration of the wall surface of the common sound path and the inflow of vibration from the cabinet surface.

According to the sixth aspect of the present invention, two sets of speaker units are arranged inside the speaker apparatus, and a common sound chamber is formed, so that the adverse effect due to cabinet vibration from the rear of the speaker unit is reduced. As a result, the assisting of the vibrating body is further improved, the adverse effects due to the action and reaction are reduced, and the sound quality of the emitted sound is improved. By facing another second speaker arranged as claimed in claim 2 and arranging another set of similar speaker units to form a common sound chamber, there are a total of three rooms, which are separated from the cabinet. Under the condition that the common sound chamber has a high rigidity and is damped, the rotational moment of the reaction / reaction vibration is eliminated as a whole. The greatest feature of this arrangement is that the distance between the common sound chambers between the speaker units facing each other is the shortest, and the back assist to the highest sound range is achieved.

According to the seventh aspect of the present invention, two pairs of speaker units are arranged back to back, the backs of the four speaker units are set as a common sound chamber, and one pair is driven with the same phase polarity so that the front in both directions is external Driving the other pair with opposite phase polarity for sound emission and guiding the two-way front to the cabinet part reduces the adverse effects of cabinet vibration from the rear of the speaker unit, and vibration of the front speaker unit The back assist from the rear speaker unit to the vibration of the body is further improved, the adverse effect due to the action-reaction vibration is also reduced, and the sound quality of the emitted sound is improved. In this case, if the action and reaction vibrations are canceled out thoroughly, the same air load conditions are required for symmetrical back-to-back, so that a common sound chamber is formed by two back-to-back speaker units, The sound is emitted in front of and another pair is led to the cabinet. This realizes a symmetrical speaker device in terms of arrangement and air load.

According to an eighth aspect of the present invention, a speaker is further arranged in front or rear in front of the speaker unit, and the rear speaker unit and the vibrator are driven so that the vibration directions are in phase. The speaker device according to any one of claims 7 to 7 further increases the number of common sound chambers, promotes the isolation and mitigation of adverse effects caused by cabinet vibrations, and eliminates adverse effects from the rear with respect to back assist. Less back-assist vibrations and less distorted sound quality.

The speaker device according to any one of claims 1 to 8, wherein the speaker device is connected to the speaker unit by providing a resistor. The present invention to be used is connected with resistance against a loss of balance in canceling the sound in the common sound chamber when the number is an odd number, and a loss of balance due to different impedance and efficiency of the speaker unit used. Adjustments result in the optimum points of claims 1-8. It is also advantageous that the sound quality can be adjusted by utilizing the property that the bass sound decreases when the generated sound of the speaker unit on the internal side is weakened and the bass sound frequency increases when it is strengthened.

The speaker device according to claim 9, wherein either or both of a sound wave pickup and a vibration pickup for the external sound emitting speaker unit are arranged in a common sound chamber formed by a plurality of speaker units. There is a method of measuring the optimal point of balance adjustment by resistance, that is, the point where the vibration cancellation of a plurality of speaker units is performed and the sound pressure of the common sound chamber is the lowest, using a sonic pickup and a vibration pickup. Since the effects of wall vibration and standing wave are superimposed, it is determined by audition which adjustment point is selected.

According to the eleventh aspect of the present invention, all of the surfaces to which the viscoelastic body can be applied, such as the frame surface on the back side of the speaker unit, excluding the vibrating body of the speaker unit, the movable part such as the damper and the edge, and the part necessary for mounting are provided. For more than 70% area and more than 40% of the entire area of the inside and outside surfaces of the cabinet wall, modified silicone, polyurethane viscoelastic sealant, epoxy modified, modified silicone epoxy, urethane The speaker device according to any one of claims 1 to 8, wherein a viscoelastic body layer that is any one of a system viscoelastic adhesive or a composite is formed with a thickness of 1 mm or more. Due to the large internal loss of the viscoelastic body, the vibration increases due to the increase in the number of vibration points of the speaker unit itself, the complexity of the structure, and the increase in wall surface. Change the energy into heat energy, suppress. Without this, it is indispensable because the adverse effect of increasing strain due to resonance due to the complicated structure becomes larger than the intended effect of reducing strain. As a countermeasure, vibration suppression is performed by forming a viscoelastic body layer, which is also performed on the wall and cabinet of the common sound chamber including the concave portion of the frame that is the surplus vibration generation point of each speaker unit. The vibration suppression effect of the speaker at the vibration source, the cabinet vibration suppression effect causing the adverse effect, and the vibration suppression effect on the vibration generation of the sound path and bulkhead of multiple speakers, The advantages of using multiple speakers including the advantages are demonstrated. The viscoelastic body layer should be formed on the vibrating body side behind the speaker frame, but it is difficult to apply to the location of the speaker unit later. However, forming the layer further promotes the effect.

According to the twelfth aspect of the present invention, the loudspeaker device according to the eleventh aspect in which a heavy object is arranged in the vicinity of the external sound emitting loudspeaker unit further increases the effect of canceling the action-reaction vibration by the plurality of loudspeakers. This is effective for an arrangement in which the arrangement is not linear and a rotational moment is generated. The cancellation of action reaction vibrations such as back-to-back of multiple speaker units is complicated because each part of the multiple speaker units moves in a complicated manner as shown in FIG. Since the part which is not left remains, the effect of canceling the action-reaction vibration is increased by the heavy object arrangement on the viscoelastic body layer. However, since the heavy object itself also has a natural vibration, a viscoelastic layer is further formed to control the vibration.

To summarize the effects, the common matters are the formation of a common sound chamber at a short distance of multiple speaker units, the arrangement of canceling action-reaction vibration, and vibration suppression by a viscoelastic body, and this is to vibration of the vibration body up to a higher frequency. The back assist, cabinet vibration isolation and action / reaction vibration are reduced to improve the sound quality. This means that in addition to the first obstacle that is adversely affected by cabinet vibration, the second obstacle of generation of reverse-phase vibration P6 on the magnet side due to the action and reaction of the vibration of the vibration body, and the vibration behind the vibration body of the speaker unit All of the third obstacle that the resistance due to the elasticity of the air cannot be ignored is solved up to the high sound range, and the vibration propagation and deformation of A, B, and C in FIG. 22 are also solved by damping. The effect of cabinet resonance is reduced, the effect of reaction and reaction is reduced, and the rigidity around the speaker unit is also structurally strong, and resonance is also prevented by a viscoelastic body, so from the standpoint of listening, any volume and any range It produces a clear sound and brings about the effect that the crispness becomes very good. The effect improves the realism of the percussion instrument, and it also allows you to hear the sound of the sign and the sound that you couldn't hear. In short, the sound that can be heard with confidence is realized, and the realization of the desired high-resolution sound is promoted.

In the present invention, although there is an increase in cost due to the use of a plurality of speaker units and a decrease in efficiency that the increased speaker unit is sounding inside, a clear sound and a realistic sound can be obtained by using a plurality of general speaker units. The best feature is that the sound quality is unclear where it is sounding, and the satisfaction with the sound quality is great regardless of the volume. When used in ordinary homes or in a normal environment, loud sounds with a lot of turbidity are disliked. As for the complexity of the structure, if the speaker unit part is integrally manufactured with plastic in mass production, and a viscoelastic body layer is formed on the speaker unit part for vibration control, the process will not be complicated.

Complaint correspondence diagram It is the figure which showed formation of the common sound chamber 6 by two speaker units, the front and back same direction approach, and formation of a viscoelastic body layer based on the 1st Embodiment of this invention. In Example 1 which concerns on the 2nd Embodiment of this invention, it is a figure of formation of the common sound chamber 6 by two speaker units and upper and lower same direction adjacent. It is Example 2 which concerns on the 2nd Embodiment of this invention, and is the figure which arranged the heavy article 3 in the cabinet of the speaker unit vicinity of FIG. In Example 3 which concerns on the 2nd Embodiment of this invention, it is a figure of formation of the common sound chamber 6 by four speaker units and upper and lower same direction adjacent. It is a figure of formation of the common sound chamber 6 by two speaker units and up-and-down reverse direction adjacency based on the 3rd Embodiment of this invention. In the speaker unit arrangement for external sound emission from the speaker unit facing forward in the reverse direction, according to the fourth embodiment of the present invention, two speaker units are arranged in front of the speaker unit in the same vertical direction. It is a figure of formation of the common sound chamber 6 between parts, and arrangement | positioning of the heavy article 3 to this. In Example 1 which concerns on the 5th Embodiment of this invention, it is the figure which increased the common sound chamber 6 to 3 chambers by arrangement | positioning 2 sets and arrangement | positioning of 1st Embodiment in a serial arrangement. In Example 2 according to the fifth embodiment of the present invention, two sets of the arrangement of the first embodiment are arranged below the series arrangement of FIG. It is the figure made into 3 rooms. In Example 3 according to the fifth embodiment of the present invention, two sets of the first embodiment are arranged so as to be orthogonal to each other, and the common sound chamber 6 is continuous and closest to the first embodiment. It is the figure which increased by 3 and was set as 3 rooms. It is the figure which has arrange | positioned so that the common sound chamber 6 may connect 2 sets of arrangement | positioning of 2nd Embodiment based on the 6th Embodiment of this invention, and it is set as 3 rooms. In Example 1 according to the seventh embodiment of the present invention, a speaker unit is further arranged in front of each speaker unit of the arrangement of the second embodiment, and the common sound chamber 6 is increased to three rooms. FIG. In Example 2 according to the seventh embodiment of the present invention, a speaker unit is arranged in the opposite direction in front of each speaker unit in the arrangement of the second embodiment, and the common sound chamber 6 is increased to 3 It is the figure made into the room. In Example 3 according to the seventh embodiment of the present invention, a speaker unit is arranged in the opposite direction in front of each speaker unit of the arrangement of the fourth embodiment, and the common sound chamber 6 is increased to 3 It is the figure made into the room. In Example 4 which concerns on the 7th Embodiment of this invention, it is a figure which arrange | positions the speaker unit further ahead of arrangement | positioning of 1st Embodiment, increased the common sound chamber 6, and was set as 2 rooms. In Example 1 according to the eighth embodiment of the present invention, two pairs of speaker units are arranged back to back, the backs of the four speaker units are set as a common sound chamber, and one pair is driven with in-phase polarity. FIG. 6 is a diagram in which the two-way front is driven to external sound emission and the other pair is driven with the opposite phase polarity to lead the two-way front to the cabinet section. In Example 2 according to the eighth embodiment of the present invention, two pairs of speaker units are arranged back-to-back, the backs of the four speaker units are used as a common sound chamber, and one pair is driven with the same phase polarity. This is a diagram in which the two-way front is driven to emit external sound, the other pair is driven with a reverse phase polarity to lead the two-way front to the cabinet section, and a speaker unit is further arranged on the upper pair of fronts. is there. In Example 1 according to the ninth embodiment of the present invention, a speaker unit connection method is shown. In Example 2 which concerns on the 9th Embodiment of this invention, it is the figure which mounted | wore with the sound wave pickup and vibration pickup for adjustment of resistance. It is a figure showing the speaker unit and cabinet of a general speaker apparatus. FIG. 21 is a diagram in which sound generation and a vibration state are added with respect to FIG. 20. FIG. 21 is a schematic diagram illustrating a vibration propagation process when a positive polarity voltage is applied to the speaker unit with respect to FIG. 20. FIG. 6 is a diagram of formation of a common sound chamber 6 by arranging two conventional speaker units in the same direction in the front-rear direction and driving them in phase. FIG. 5 is a diagram of formation of a common sound chamber 6 by arranging two conventional speaker units back to back in opposite directions and driving them in phase.

Hereinafter, embodiments of the present invention will be described in detail. In the present invention, the adverse effects due to the vibration P5 from the cabinet in FIG. 21, the adverse effects due to the action / reaction vibration P6, and the adverse effects on the vibration of the vibrating body due to the air elasticity due to the cabinet capacity are simultaneously realized up to the high sound range. For this purpose, as shown in FIG. 2, the two speaker units are arranged forward and backward, close to the distance between the speaker units SP1 and SP2 of FIG. The common sound chamber 6 is formed by operating in the polarity and guiding the sound path from the rear part of the vibrating body of the front speaker unit to the rear part of the vibrating body of the rear speaker unit while canceling out the mutual reaction reaction vibration. Further, the front part of the rear speaker unit is led to the cabinet. According to FIG. 2, the sound path is 80 mm, which is reduced by 30%, and the back assist is increased by 50% to about 1.2 kHz. If the common sound chamber is long and large, the back assist effect is reduced, and at the same time, it becomes a second cabinet and resonates.

In the implementation, it is necessary to reduce the vibration P4 of the cabinet part and to isolate the vibration of the cabinet wall transmission. Therefore, in consideration of this, the viscoelastic layers 2a, 2b, 2e, and 2f are provided on the inner and outer surfaces in order to reduce wall resonance. It is necessary to form, and it is better to separate the cabinet wall surface by eliminating the common wall surface between the cabinet wall surface and the speaker unit or the common sound chamber 6 part. Furthermore, in FIG. 24, the sound wave transmission in the common sound chamber 6 is folded back 180 degrees and reaches the internal speaker unit, whereas in FIG. 2, the sound waves reach the vibrating body of the internal speaker unit with 90-degree diffraction. The sound is easy to push-pull, and it is advantageous in terms of forming a common sound chamber and sound path with less sound reflection. Further, since the front and rear speaker units operate with opposite polarities, the movement of the vibrating body edge is reversed, and asymmetric distortion during the expansion and contraction of the edge is improved, so that the sound quality emitted forward is enhanced.

As an application of FIG. 2, it is also a good method to form two common sound chambers on the left and right instead of the upper part of the front and rear speaker units in order to allow sound to reach between the front and rear speaker units more evenly and simultaneously. If the path to the cabinet is not the lower side but the upper and lower two units are arranged rearward, when the two speaker units are modularized, it can be attached to the speaker holes of the existing cabinet. Other arrangements will be described sequentially including FIG. 2, but when a comparison between a general speaker device and FIG. 2 is performed with the same source, for example, a high frequency is a cymbal sound, a low frequency is a bass sound, The overall reproducibility of piano sounds, stringed instrument sounds and vocal sounds, as well as the localization and resolution, especially the reproducibility of the sound quality of difficult grand piano sounds, increases the resolution of high-frequency subtle and heavy sound attacks, and expands the dynamic range. In addition, the distortion of the mid-range of several hundred hertz is reduced and a real and clear sound is realized, and when the vibration suppression by the formation of the viscoelastic body layer in the speaker unit and the common sound chamber is advanced, the gloss is finally reached The sound quality that should be called a sound of a different dimension is reached. Moreover, this application range is wide, and the sound quality is improved in each of the ultra-small to large-sized, low-priced to high-end bands.
<First Embodiment>

FIG. 2 shows a cross-sectional structure of the speaker device according to the first embodiment of the present invention. In this first embodiment, two speaker units are arranged close to each other in the same direction, and a common sound chamber is formed by the back part of the external sound emitting speaker unit and the back part of the internal speaker unit. This is a speaker device that is driven with opposite phase polarities and leads the front of the internal speaker unit to the cabinet section. The cabinet sound and the front speaker unit SP1 are separated from each other by the common sound chamber 6 formed between the front and rear speaker units SP1 and SP2, and the common sound chamber 6 is brought into a noise canceling state by back assist, and the action reaction vibration. P6 is reduced by driving the two speaker units in opposite directions to improve the sound quality of the emitted sound. In addition, since the vibration P3 of the common sound chamber 6 and the cabinet part is also required to be reduced, the formation of viscoelastic body layers 2a, 2b, 2e, and 2f according to claim 12 is also shown in this figure, and the common by the pair of speaker units is shown. The common wall surface between the formation part of the sound chamber 6 and the cabinet part 1 is eliminated to form a separation structure, thereby preventing the cabinet vibration P3 from entering the wall surface. Although the figure shows a cross-sectional structure, a common sound chamber is formed with a width slightly larger than the speaker width in the width direction when viewed from the front on the left side of the figure, and it is placed on a cabinet having a width several times the speaker width. In the figure, it seems that the speaker frame part has a viscoelastic body layer on it, so it seems that sound can not be diffused backwards, but the speaker frame has a plurality of large holes, Even after the formation of the viscoelastic body layer on the frame, there is no problem with respect to the backward diffusion of sound from the vibrating body.

In addition to wooden and plastic materials, there are also metal-based, ceramic, glass-based, and stone-based cabinets that contain concrete and marble, but they are accompanied by resonance and partial vibration, and contact the music box module. When you play it, you can see this well by the amplification of the sound by resonance. In the vibration suppression by the formation of the viscoelastic layer, the viscoelastic body has an affinity for these various materials, and the vibration by striking and the resonance in the music box are reduced by the layer formation, and the vibration suppression effect is confirmed. Viscoelastic body layer formation is 70% or more of all surfaces to which viscoelastic material can be applied, such as the frame surface on the back side of the speaker unit, excluding the vibration parts of the speaker unit, movable parts such as dampers and edges, and parts necessary for mounting. And 40% or more of the entire area of all the walls of the cabinet wall, modified silicone-based, polyurethane-based viscoelastic sealant, epoxy-modified, modified silicone-epoxy, urethane-based viscosities A viscoelastic layer that is either an elastic adhesive or a composite is formed with a thickness of 1 mm or more. The formation of a viscoelastic layer in a wide area can convert the thermal energy of vibration energy due to its large internal loss. Resulting in a reduction in the generation of unwanted surplus vibrations and the resulting distortion. From the standpoint of vibration control, it is desirable to form a viscoelastic layer on the entire inner and outer surfaces of the cabinet, and also to have a thickness exceeding 6 mm. However, 40% of the entire area is, for example, all inside only from the viewpoint of appearance. The choice to apply is shown. As for the application area of the speaker unit, the entire area behind the speaker unit is preferable. However, when the essential area is narrowed down, the frame and the concave part of the frame out of the frame area, the frame concave part, and the magnet cover that constitute the back area. Since it is the most important, 60% or more of the entire area is an essential area.

A viscoelastic material is a modified silicone-based, polyurethane-based viscoelastic sealant, epoxy-modified, modified silicone-epoxy, or urethane-based viscoelastic adhesive. The elastic body has great internal loss and is effective in suppressing vibrations. Especially, the modified silicone sealant of the sealing material is representative of Cemedine POS seal SM-444 and has good affinity, no fluidity, and good durability. And, above all, it is a good material as a vibration damping material for the speaker device that there is little resonance after hardening and the rigidity is increased. In FIG. 2, a viscoelastic layer is formed on the speaker frame, so it seems that the sound cannot be diffused backwards at first glance, but the speaker frame has a plurality of large holes. Even after the formation of the viscoelastic body layer on the frame, there is no problem with respect to the backward diffusion of sound. In applying, it is important to secure the strength of the adhesive surface with the speaker unit, and it is essential to perform alcohol degreasing or primer treatment. In the figure, the cabinet type is a closed box type, but not only the closed type but also the phase reversal bass reflex type, rear open type, back load horn type, etc., including vibration suppression by forming the viscoelastic layer of the present invention. In addition, the method of arranging multiple speakers exhibits the effect in such a manner that the merit of the method is superimposed on the merit of the less distortion, the crispness and the surplus vibration of the present method.
<Second Embodiment>

Next, a second embodiment of the present invention will be described.

FIG. 3 illustrates a cross-sectional structure of the speaker device according to the first embodiment. In the first embodiment, two speaker units are arranged adjacent to each other in the same direction, and a common sound chamber is formed between the back part of the external sound emitting speaker unit and the back part of the internal speaker unit so that they have opposite phase polarities. It is a speaker device that drives and guides the front of the internal speaker unit to the cabinet section. The common sound chamber 6 formed between the adjacent speaker units SP1 and SP2 isolates the cabinet vibration and the sound emitting speaker unit SP1, and the common sound chamber 6 is brought into a noise canceling state by back assist, and also acts and reacts. The vibration P6 is reduced by driving the two speaker units in opposite directions to improve the sound quality of the emitted sound. In addition, since it is necessary to reduce the vibration P3 of the common sound chamber 6 and the cabinet portion, the viscoelastic body layer formations 2a, 2b, 2e, and 2f according to claim 12 are also shown in this drawing. The advantage of this arrangement is that the distance between the two speaker units is even closer, and that the two speakers are housed in a box, making it easier to manufacture. Furthermore, since the structure is simple, it is easy to reinforce and it is easy to apply a viscoelastic body. However, with regard to action / reaction vibration, SP1 and SP2 are not on the same axis, so the canceling effect is reduced and a rotational moment remains. This can be dealt with by utilizing the heavy object of the second embodiment. If a wide-mouth glass bottle or a thermos bottle is used in this cabinet in FIG. 3, if the inside and outside of the SP2 circular speaker mount part is fitted with a PVC pipe joint and the inside and outside are damped with a sufficient viscoelastic body layer, it can be manufactured. A small speaker device that is easy, lightweight, and can be used up to the low sound range is realized.

FIG. 4 illustrates a cross-sectional structure of the speaker device according to the second embodiment. The second embodiment is the speaker device of FIG. 4 in which a heavy object is arranged near the speaker unit for external sound emission. When a non-magnetic heavy object is arranged through the viscoelastic material layer near the upper portion of the external sound emitting speaker unit SP1 with respect to FIG. 3, FIG. 4 is obtained. By placing a weight several times the weight of the speaker unit in the vicinity of the speaker unit, this becomes a fulcrum that is close to the stationary point, and the effect of reducing the rotational moment due to the action and reaction of each speaker in the second embodiment as the action point Give birth. Moreover, this heavy object arrangement | positioning also makes the effect of suppression of the propagation vibration transmitted through the cabinet of the vibration from a cabinet. In addition, since a heavy object is arranged through a viscoelastic body layer and the heavy object also has a natural vibration, it is necessary to form a viscoelastic body layer also from the outer side. As a result, adverse effects due to the action and reaction are reduced, and the sound quality of the emitted sound is improved.

FIG. 5 illustrates a cross-sectional structure of the speaker device according to the third embodiment. In this third embodiment, another set of speakers are arranged symmetrically in order to eliminate the rotational moment generated by canceling the action reaction vibration generated in the embodiment of the first embodiment. This constitutes the chamber 4 and the rotational moment is offset by the symmetry arrangement. Also in this example, it is necessary to sufficiently suppress the vibration due to the rigidity of the structural surface and the formation of the viscoelastic body layer inside and outside the speaker unit and the cabinet wall surface. In the figure, four speaker units are arranged on a straight line. However, as an application of this, there is an arrangement in which two and two units are symmetrically adjacent to each other when viewed from the front. Since it is adjacent, the structure of the common sound chamber 6 is more desirable in terms of rigidity. The two cabinets extending forward may be placed in a 90-degree bent direction, or two at the rear may be shared, and a speaker unit assembly may be embedded in the center of one cabinet. As a result, adverse effects caused by cabinet vibration are isolated and reduced, and adverse effects caused by action and reaction are also reduced, thereby improving the sound quality of the emitted sound.
<Third Embodiment>

FIG. 6 illustrates a cross-sectional structure of the speaker device according to the third embodiment of the present invention. In this fifth embodiment, two speaker units are arranged opposite to each other with their mounts adjacent to each other, and a common sound chamber is formed by the rear part of the external sound emitting speaker unit and the front part of the internal speaker unit. Thus, the speaker device is driven with the same phase polarity and guides the rear part of the internal speaker unit to the cabinet part. The cabinet sound and the front speaker unit SP1 are separated from each other by the common sound chamber 6 formed between the speaker units SP1 and SP2. The common sound chamber 6 is brought into a noise canceling state by the back assist, and the action reaction vibration P6. Mitigation is performed by driving the two speaker units in opposite directions to improve the sound quality of the emitted sound. This arrangement does not compensate for edge distortion because the two speakers operate in the same polarity, and because it is not in a common box, it becomes difficult to suppress vibrations due to enclosure of the speaker unit by the box, but it has a great advantage. . It is a point that can be improved by adding to the existing speaker device. If the SP1 box is placed in front of the speaker device that has been used for many years, the sound output direction will be reversed, but the effect similar to the second embodiment can be obtained, so in the kit for this arrangement, Effective utilization of owned speakers, realization of the latest speakers, and distortion cancellation are realized. At this time, the adjustment by the resistance of the fourteenth embodiment is effective for correcting the efficiency of the speaker. As a result, adverse effects caused by cabinet vibration are isolated and reduced, and adverse effects caused by action and reaction are also reduced, thereby improving the sound quality of the emitted sound.
<Fourth embodiment>

FIG. 7 shows a cross-sectional structure of a speaker device according to the fourth embodiment of the present invention. In the fourth embodiment, two speaker units are arranged adjacent to each other in the same direction with the rear part in front, and a common sound chamber is provided between the front part of the speaker unit for external sound emission from the rear part and the front part of the internal speaker. Is driven with opposite phase polarities, and the speaker device guides the rear of the internal speaker unit to the cabinet section. This feature is that the speaker unit SP1 is arranged in a direction opposite to the normal direction, so that a non-directional sound spread can be obtained. In this arrangement, if the speaker unit is positioned below, a large heavy object as shown in the figure. Therefore, the rotational moment for canceling the action-reaction vibration between SP1 and SP2 can be sufficiently eliminated, the ideal of generating sonic vibration from a stationary point, the isolation of cabinet vibration, and the vibration assist of the vibrating body Three points can be made. The arrangement of the speaker unit is also the formation of a simple common sound chamber with a short distance. If the structure is strong and sufficiently controlled by the viscoelastic material layer, a crisp sound with little distortion can be realized. When the speaker unit is used in the reverse direction, the vibration direction of the damper of the vibrating body is opposite to that of the vibrating body. If a discoid body with a hollow is arranged from the frame, the sound can be cut off.
<Fifth embodiment>

Next, a fifth embodiment of the present invention will be described.

FIG. 8 illustrates a cross-sectional structure of the speaker device of the first embodiment. Example 1 is a speaker device in which two sets of speaker units in the first embodiment shown in FIG. 2 are arranged inside a speaker device, and two sets of speakers are arranged in series in a common sound chamber. It is. In this arrangement, the common sound chamber 6 is increased to promote isolation from cabinet vibration, the back assist effect is enhanced, and the reproduced sound is made clearer. Furthermore, if the cabinet 1 and the common sound chamber 6 do not have a common wall surface, the isolation is thorough, and the reverberation due to the sound and sound remaining due to the cabinet vibration is eliminated. What is important is the vibration suppression by the viscoelastic body of the speaker unit and the common sound chamber baffle, which is the key to the effect of this arrangement. The cancellation of the action reaction vibration is performed between SP1 and SP2 and between SP3 and SP4.

FIG. 9 illustrates a cross-sectional structure of the speaker device according to the second embodiment. In Example 2, two sets of speaker units of the first embodiment of FIG. 2 are arranged inside the speaker device, and the two speaker units of the speaker device arranged in a common sound chamber are arranged below the series arrangement. The speaker device is arranged adjacent to each other. With this arrangement, the path between SP2 and SP3 of the common sound chamber 6 is shortened, so that the complementary relationship between the speaker units is improved. Structurally, it is difficult to separate the cabinet part and the common sound chamber part of the speaker assay. Note that the action / reaction vibration is canceled between SP1 and SP2 and between SP3 and SP4.

FIG. 10 illustrates a cross-sectional structure of the speaker device according to the third embodiment. In Example 3, two sets of speaker units of the first embodiment shown in FIG. 2 are arranged inside the speaker apparatus, and two sets of speaker units of the speaker apparatus arranged so as to form a common sound chamber are arranged orthogonally. This is a speaker device. With this arrangement, the common sound chamber 6 is increased in the shortest continuous and closest manner. In this arrangement, the counteraction vibration is canceled between SP1 and SP3, and SP2 and SP4. For the common sound chamber, the SP1 back surface to the SP2 back surface, and the SP3 back surface to the SP4 front surface in order. Relayed.
<Sixth Embodiment>

FIG. 11 shows a cross-sectional structure of a speaker device according to the sixth embodiment of the present invention. The sixth embodiment is a speaker device in which two sets of speaker units of the second embodiment shown in FIG. 3 are arranged inside a speaker device so as to form a common sound chamber. Under the condition that the rigidity of the common sound chamber is strongly damped, the rotational moment of the action / reaction vibration is eliminated as a whole. The biggest feature of this arrangement is that the common sound chamber distance between the facing speakers is short, and it is easy to make because of the simple structure of arranging two sets facing each other in the cabinet. Easy to strengthen. If a wide-mouth glass bottle or a thermos bottle is used in the cabinet in FIG. 11, if the inside and outside of the SP4 circular speaker mount are fitted with a PVC pipe joint and the inside and outside are damped with a sufficient viscoelastic body layer, it can be manufactured. A small speaker device that can be easily reproduced with low distortion and low sound is realized.
<Seventh embodiment>

Next, a seventh embodiment of the present invention will be described.

FIG. 12 illustrates a cross-sectional structure of the speaker device according to the first embodiment. Example 1 is a speaker device in which a speaker unit is further arranged in front of the speaker unit of the second embodiment of FIG. 3 and is driven so that the vibration direction of the rear speaker unit and the vibrating body are in phase. . Cabinet vibration is isolated by increasing the number of common sound chambers 6, and the structure is relatively easy to make. The cabinet is also easy to control vibration and strengthen rigidity. In FIG. 12, when a wide-mouth glass bottle or thermos bottle is used for the cabinet, if the inside and outside of the SP4 circular speaker mount are fitted with a PVC pipe joint and the inside and outside are damped with a sufficient viscoelastic layer, the manufacturing can be performed. A small speaker device that can be easily reproduced with low distortion and low sound is realized.

FIG. 13 illustrates a cross-sectional structure of the speaker device of the second embodiment. Example 2 is a speaker device in which a speaker unit is further arranged in front of the speaker unit of the second embodiment shown in FIG. 3 and is driven so that the vibration direction of the rear speaker unit and the vibrating body are in phase. . This arrangement is most effective as a back assist up to the high sound range to the operation of the speaker unit connected to the front because the distance between the speaker units is the closest because the two pairs of speaker units face each other. At the same time as the distortion is reduced to the high frequency range, the back-and-forth motion in the same phase in the opposing vibrating body arrangement also works in the direction of correcting the asymmetry generated by the edge of the vibrating body and the damper.

FIG. 14 shows a cross-sectional structure of the speaker device of the third embodiment. Example 3 is a speaker device in which a speaker unit is further disposed in front of the speaker unit of the fourth embodiment in FIG. 7 and driven so that the vibration direction of the rear speaker unit and the vibrating body are in phase. . Here, a heavy object is removed from FIG. 7, and a speaker unit is additionally arranged back to back. This arrangement is constructed with the top and bottom arrangement of two pairs of speakers back to back rather than the addition of a speaker unit at the front, so vibration suppression and rigidity reinforcement by the viscoelastic body on the speaker unit is the easiest to do Realistic sound with a structure and little distortion can be obtained relatively easily.

FIG. 15 illustrates a cross-sectional structure of the speaker device according to the third embodiment. In Example 3, a speaker unit is further arranged in front of the speaker unit of the first embodiment shown in FIG. 2, and is driven so that the vibration directions of the rear speaker unit and the vibrating body are in phase. It is. Air vibration propagation and solid vibration propagation from the cabinet cannot be removed by simply placing a single common sound chamber, but when adding two more speakers, it is too big to add a common sound chamber. The additional formation of live. However, in this case, when three speaker units having the same impedance are connected in series, for example, the canceling action of the action reaction vibration is not balanced, but as described in the ninth embodiment, the connection method and the resistance By adjusting the value, find the optimum point including the range balance.
<Eighth Embodiment>

Next, an eighth embodiment of the present invention will be described.

FIG. 16 illustrates a cross-sectional structure of the speaker device according to the first embodiment. In this embodiment, two pairs of speaker units are arranged back to back, the back of the four speaker units is a common sound chamber, one pair is driven with the same phase polarity, and the front in both directions is externally emitted. This is a speaker device that drives another pair with a polarity opposite to that of the other pair to guide the front in both directions to the cabinet section. This feature is structurally symmetrical with respect to each speaker unit, including the air load, and is the best arrangement for canceling action-reaction vibration. In this example as well, it is necessary to reduce the vibration by strengthening the rigidity and forming the viscoelastic body layer on the inside and outside of the wall. Reduction is also achieved, realizing a crisp sound with less distortion. Note that the sound emission direction is bidirectional, but a reflecting plate directed in one direction may be provided, or may be used omnidirectionally as a form of emitting sound up and down.

FIG. 17 illustrates a cross-sectional structure of the speaker device according to the second embodiment. In this second embodiment, two pairs of speaker units are arranged back to back, the back of the four speaker units is a common sound chamber, one pair is driven with in-phase polarity, and the front in both directions is externally emitted. This is a speaker device that drives the other pair with opposite phase polarity to guide the two-way front to the cabinet part, and further arranges the speaker unit forward in front of each of the pair of speaker units for external sound emission The speaker device is driven so that the vibration direction of the rear speaker unit and the vibrating body are in phase. This feature is structurally symmetrical with respect to each speaker unit, including the air load, and is the best arrangement for canceling action-reaction vibration. Further, the cabinet vibration and the front speaker SP1 are separated from each other, and the level of noise canceling is improved. Although six speaker units are used, the effect obtained is great. In this example as well, it is necessary to reduce the vibration by strengthening the rigidity and forming the viscoelastic body layer on the inside and outside of the wall. Reduction is also achieved, realizing a crisp sound with less distortion. Note that the sound emission direction is bidirectional, but a reflecting plate directed in one direction may be provided, or may be used omnidirectionally as a form of emitting sound up and down.
<Ninth embodiment>

Next, a ninth embodiment of the present invention will be described.

FIG. 18 illustrates the connection of the speaker unit in the first embodiment. 9. The speaker device according to any one of claims 1 to 8, wherein the first embodiment is connected to a speaker unit with a resistor. As shown in the parallel connection of FIG. 15, the connection of the speaker unit with a resistor is connected in series with SP1 and SP2 that are connected in parallel and driven in reverse phase with respect to the connection of the speaker unit to the amplifier. This is the arrangement of a variable resistor, which is the fourteenth embodiment. If the amplifier is connected in series with a reverse phase, it can be adjusted with a parallel resistive load, and whether the two speaker units are connected in parallel or in series depends on the speaker impedance and the combined resistance is less than 4 ohms. Choose not to be. This change in resistance value results in a decrease in the volume of SP1 and SP2. However, if the volume of the front speaker unit is lowered, the backup by the rear speaker unit is relatively strengthened, indicating the appearance of a drone cone Kelton-type subwoofer. When the low frequency range increases and the volume of the rear speaker is lowered, the backup becomes relatively weak, and the frequency characteristics can be adjusted by utilizing the fact that the low frequency range is reduced. Although the same type of even number arrangement has been assumed so far, it is also possible to adjust the difference in efficiency between the use of different types of speakers and the arrangement of odd number of speaker units.

FIG. 19 shows a cross-sectional structure of the speaker device of the second embodiment. The second embodiment is a speaker device of FIGS. 2 and 18 in which a sound wave pickup is arranged in a common sound chamber formed by a plurality of speaker units and a vibration pickup is arranged for an external sound emitting speaker unit. As shown in FIG. A vibration pickup is attached to the front speaker unit, and a microphone is placed in a common sound chamber of the front speaker unit and the rear speaker unit to detect vibration and sound. For example, when a common sound chamber is formed by a plurality of speaker units and the action and reaction are canceled, the sound in the common sound chamber and the vibration of the front speaker are reduced, and connected to the microphone terminal of the MD recorder, for example. Adjust the variable resistance to the optimum value using the pink noise signal. It is desirable to replace the variable resistor with a fixed resistor after the resistance value is determined, and it is also necessary to have a sufficient power capacity.

From the above embodiments, it is shown that the reduction of distortion by arranging a plurality of speakers in the speaker device of the present invention is useful for extracting the original performance of the vibration unit of the speaker unit, and the original value of the current speaker unit. Realize. Although the number of speaker units used is doubled and one of them is less efficient due to internal use, it is invaluable to obtain high-quality sound. Especially when listening in ordinary homes and towns, the sound quality is better than the volume, and there are various examples that can be developed according to the situation. The realization of a more realistic sound in the high class. Further development and improvement of sound quality by adding a speaker to an existing speaker device also realizes both improvement of the satisfaction of the speaker device and extension of life. Along with the progress of an aging society, the role of improving the satisfaction of the mind about sound is great, and the goodness of sound makes it comfortable and increases the moisture of life. Further, the present invention for effective use of a plurality of speakers also promotes further progress such as integration of a vibrating body, a vibration mechanism, and a plurality of speakers.

DESCRIPTION OF SYMBOLS 1 Cabinet 1a Cabinet front baffle 1b Cabinet back plate 1c Cabinet top plate 1d Cabinet bottom plate SP Speaker unit SPa Speaker unit vibrator SPb Speaker unit vibrator damper SPc Speaker unit vibrator edge SPd Speaker unit frame SPe Speaker unit magnet cover SPf Speaker unit bobbin SPg Speaker unit voice coil SPh Speaker unit magnet SPi Speaker unit top plate SPj Speaker unit crimp part SPk Speaker unit yoke SPm Speaker unit frame concave part SP1 Speaker unit 1
SP2 Speaker unit 2
SP3 Speaker unit 3
SP4 Speaker unit 4
SP5 Speaker unit 5
SP6 Speaker unit 6
P Air vibration P1 Air vibration in front of the vibration body due to vibration of the vibration body of the speaker unit. In the case of the arrow from the vibration body to the front, it is a positive phase connection, and the moving direction of the vibration body when positive is applied to the positive pole. In the case of the arrow in the opposite direction, the moving direction of the negatively applied vibrating body is indicated by the reverse-phase connection, and the other arrow is also accompanied by the moving vibration. P2 Due to the vibration of the vibrating body of the speaker unit Air vibration behind the vibrating body P3 Edge vibration and damper vibration of the speaker, and front baffle vibration due to action and reaction vibration of the magnet P4 Air propagation of the air vibration P2 behind the vibrating body due to vibration of the vibrating body of the speaker unit and front baffle vibration P3 The excess vibration of the cabinet due to the solid propagation of the air P5 The air vibration reflected by the cabinet surface of the air vibration P2 behind the vibrating body and the key By air-borne vignette excess vibration P4, the viscoelastic material layer of the vibrating 2 viscoelastic layer 2a cabinet outer surface side of the speaker magnet side by action and reaction of the vibration of the vibrating body of the additional vibration P6 speaker unit on the back side of the vibrator
2b Viscoelastic body layer on the inner surface side of the cabinet 2e Viscoelastic body layer on the back side of the speaker unit 2f Viscoelastic body layer in the vicinity of the speaker unit mounting portion 2g Viscoelastic body layer between the speaker units back to back 3 Heavy object 6 Forming baffle 6b Sound pickup microphone 6c Vibration pickup R1 SP1 Volume adjustment variable resistor R2 SP2 Volume adjustment variable resistor R3 Fixed resistor R4 Fixed resistor

Claims (12)

Multiple speaker units are arranged close to each other in the same direction, and a common sound chamber is formed between the rear part of the external sound emitting speaker unit and the rear part of the internal speaker unit, and is driven with opposite phase polarity to each other. A speaker device characterized by guiding the front of the speaker to a cabinet portion. A plurality of speaker units are arranged adjacent to each other in the same direction, and a common sound chamber is formed between the back part of the external sound emitting speaker unit and the back part of the internal speaker unit, and is driven with opposite phase polarities. A speaker device characterized by guiding the front to a cabinet portion. Multiple speaker units are placed with their mounts adjacent to each other in opposite directions, and a common sound chamber is formed between the rear part of the external sound emitting speaker unit and the front part of the internal speaker unit, and is driven with the same phase polarity. A speaker device, wherein a rear portion of a speaker unit is guided to a cabinet portion. A plurality of speaker units are arranged adjacent to each other in the same direction with the rear part in front, and a common sound chamber is formed between the front part of the speaker unit for external sound emission and the front part of the internal speaker unit from the rear part, and they have opposite phase polarities. A speaker device that is driven to guide the rear of an internal speaker unit to a cabinet portion. 2. The speaker device according to claim 1, wherein two sets of speaker units are arranged in the speaker device so as to form a common sound chamber. 3. The speaker device according to claim 2, wherein two sets of speaker units are arranged in the speaker device so as to form a common sound chamber. Two pairs of speaker units are arranged back to back, and the back of the four speaker units is a common sound chamber. The speaker device is characterized in that the two-way front is led to the cabinet section by driving with a reverse phase polarity. The speaker unit is further arranged in front of or behind the speaker unit, and is driven so that the vibration direction of the rear speaker unit and the vibrating body are in phase. Speaker device. The speaker device according to claim 1, wherein a resistor is disposed and connected to the speaker unit. 10. The speaker device according to claim 9, wherein one or both of a sound wave pickup and a vibration pickup for an external sound emitting speaker unit are arranged in a common sound chamber formed by a plurality of speaker units. 70% or more of the entire surface to which viscoelastic material can be applied, such as the frame surface on the back side of the speaker unit, excluding the vibrating body of the speaker unit, movable parts such as dampers and edges, and parts necessary for mounting, and the wall surface of the cabinet One of the modified silicone-based, polyurethane-based viscoelastic sealant, epoxy-modified, modified silicone epoxy-based, and urethane-based viscoelastic adhesives for an area of 40% or more of the entire area of all surfaces Alternatively, the composite viscoelastic material layer is formed with a thickness of 1 mm or more, and the speaker device according to any one of claims 1 to 8. The speaker device according to claim 11, wherein a heavy object is arranged near the speaker unit for external sound emission.

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