JP2007067999A - Vibration sound generator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compact and long-life vibration sound generator for a low frequency area by which faithful reproduction in a low frequency area which is difficult in principals by a conventional reproduction apparatus. <P>SOLUTION: In a device which is driven directly by connecting a vibration sound expression body 11 and a vibration rotation type motor 1 by a connector 10, a signal modulated by a momentary amplitude value of an electric signal is input to the vibration rotation type motor 1 rotated regularly. Thus, while keeping a relative movement direction between a motor drive surface and a driven surface to be constant, the relative rotation speed is varied to express vibration or sound according to the electric signal. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

The present invention relates to a low-frequency vibro-acoustic generator using a motor such as a vibration wave motor, and more particularly to a low-frequency speaker device.

Currently, most of the speakers that are generally used are electromagnetic types (also called electrodynamic types) called dynamic types, and some high-fidelity speakers are electrostatic types. On the other hand, in JP-A-8-79896 (Patent Document 1) and JP-A-2000-225377 (Patent Document 2), a loudspeaker (vibration acoustic expression body) is directly connected by a vibration wave motor driven by a progressive vibration wave. A configuration based on a new principle of mechanical driving has been proposed. Further, Japanese Patent Laid-Open No. 2005-184100 (Patent Document 3) converts rotational reciprocating vibration generated by a vibration wave motor into linear reciprocating vibration by a pulley and a rod. Although a drive mechanism for transmitting to a speaker has been proposed, it has not yet been put into practical use.

A dynamic speaker uses an electromagnetic phenomenon, and drives a speaker (vibration acoustic expression body) by an electromagnetic force (Fleming's left-hand rule) generated according to the amount of current flowing in a magnetic field. In other words, a speaker (vibration sound generating body) is vibrated by flowing power corresponding to sound through a voice coil in a constant magnetic field, and the surrounding air is swayed to emit sound, which has already been over 80 years. There is history.

In recent years, TVs have been increasing in screen size, but in parallel there is a great need for thinning and weight reduction, and the above-mentioned conventional low-frequency speakers have reached the limit in terms of weight and other improvements. It is desired.

Recently, research has been conducted to reproduce not only sound but also mechanical vibration, aiming to reproduce a more realistic situation, and in a chair equipped with a large number of speakers and vibration generators. Along with sitting on the large screen in front of you, you can enjoy watching powerful movies that stimulate all five senses. Appropriately applying physical and acoustic vibrations is said to provide not only the effect of enhancing the sense of presence and the effect of deepening the impression, but also the effect of relaxation, and the sensory acoustic device is also expected to be applied to receptive music therapy Yes. Development of a small and inexpensive device that can accurately reproduce vibrations and sounds in the low frequency range that meet these needs has been desired.

JP-A-8-79896 JP 2000-225377 A JP-A-2005-184100

In a dynamic speaker, a back electromotive force is also generated when a voice coil, which is a conductor, moves in a magnetic field (Fleming's right hand rule). This counter electromotive force is intricately entangled with the impedance of the amplifier, and various adverse effects are exerted on the speaker characteristics such as deteriorating the linearity of the electromagnetic speaker motor. Furthermore, the same interaction appears in the piezo element transducer.

In addition, the dynamic speaker has a resonance phenomenon and a group delay phenomenon as fatal defects based on the operating principle, and a trade-off is always required among the size, weight, output, and the like.

On the other hand, Patent Document 1 proposes a configuration based on a new principle of mechanically directly driving a speaker (vibration-acoustic body) by a vibration wave motor driven by a progressive vibration wave. It is said that the inherent disadvantages of the reaction system have finally been improved.

However, the above-described invention only shows the superiority of the vibration wave motor over the conventional electromagnetic speaker motor, and no specific and detailed configuration of the speaker capable of fully exhibiting its performance is presented.

In Patent Document 2, the vibration transmitting member (connector) is arranged so as to be point-symmetric with respect to the rotational output shaft of the vibration wave motor, and the two opposing diaphragms (vibration acoustic manifesting bodies) are in antiphase. A small and lightweight speaker device is shown in FIG. 1, which is not only a feature associated with the adoption of the vibration wave motor described in Patent Document 1, but also the length of the vibration wave motor by avoiding the generation of an unbalanced load. It is said that it has been possible to obtain a vibration generator that has a long life, an extremely compact flat bass speaker, or a vibration generator that generates noise having a phase opposite to that of noise vibration to remove noise.

However, in both inventions, as shown in FIG. 14 (reprinted from Patent Document 1), a method of driving the vibro-acoustic body by forward / reverse rotation of the vibration rotary motor is employed, and the rotational operation of the vibration rotary motor is performed. When switching, that is, when the forward and reverse speed directions are switched (at zero cross), the friction state suddenly changes from dynamic friction in the forward direction to static friction and dynamic friction in the reverse direction. And low frequency vibration and sound could not be reproduced faithfully.

In Patent Document 3, one end of a flexible member is attached to a pulley installed in a vibration rotary motor, and a rotational movement applied to a speaker is absorbed by winding a rotational movement change around the pulley. Has been proposed to reduce the couple by point symmetry with respect to the speaker center, but in order to avoid the creep phenomenon that occurs in the flexible member, it is necessary to apply a very large tension, There was a problem in terms of cost and reliability, such as a very complicated structure and a long life expectancy.

The present invention has been made under such circumstances, and provides a vibration reproducing apparatus capable of faithfully reproducing low-frequency vibration and sound, and a high-accuracy vibro-acoustic sound generating apparatus for low frequencies used as a speaker apparatus. It is for the purpose.

In order to achieve the above-described problems, the vibro-acoustic generator of the present invention has the following configurations (1) to (8).

(1) A vibro-acoustic generator,
A motor in which a driving body that generates a rotational driving force on a driving surface by an input signal and a driven body having a driven surface that is driven to face the driving surface are paired so as to be relatively rotatable; ,
At least one inertia disk having a polar rotation moment of inertia equal to or greater than that of the driving body, and a rotating shaft in which the driven body is integrally fixed; and
At least one bearing installed between the driving body and the rotating shaft and rotatably supporting the driving body around the rotating shaft;
At least one bearing installed between the rotating shaft and a bearing support and supporting the rotating shaft and the driven body so as to be continuously rotatable around a rotation center coordinate axis of the driven body;
An elastic support member that is installed between the driving body and the stationary body and limits a rotatable range of the driving body;
A motor vibration device composed of
A vibro-acoustic body that expresses input vibration as mechanical vibration or sound wave;
A connector for connecting the driving body and the vibro-acoustic expression body to transmit the vibration operation of the driving body to the vibro-acoustic expression body;
With
By inputting a signal modulated with an instantaneous amplitude value of an electric signal as an input signal in a state where the motor is continuously rotating at a predetermined rotation speed by an input signal,
The relative rotational speed between the driving body and the driven body is changed while the relative movement direction between the driving surface and the driven surface is kept constant, and the vibration operation of the driving body is performed via the connector. A vibro-acoustic generator, wherein the vibro-acoustic generator transmits mechanical vibration or sound wave corresponding to the input signal.

(2) a vibro-acoustic generator,
A motor in which a driving body that generates a rotational driving force on a driving surface by an input signal and a driven body having a driven surface that is driven to face the driving surface are paired so as to be relatively rotatable; ,
An input terminal for transmitting an input signal to the continuously rotating driving body;
An inertia ring integrally attached to the driving body and having a polar rotation inertia moment equal to or greater than that of the driven body;
A rotating shaft on which the driven body is integrally fixed; and
At least one bearing installed between the driving body and the rotating shaft and supporting the driving body so as to be continuously rotatable around the rotating shaft;
At least one bearing installed between the rotating shaft and a bearing support and rotatably supporting the rotating shaft and the driven body around a rotation center coordinate axis of the driven body;
A motor vibration device composed of
A vibro-acoustic body that expresses input vibration as mechanical vibration or sound wave;
A connector for connecting the driven body or the rotating shaft and the vibro-acoustic expression body to transmit the vibration operation of the driven body to the vibro-acoustic expression body;
With
By inputting a signal modulated with an instantaneous amplitude value of an electric signal as an input signal in a state where the motor is continuously rotating at a predetermined rotation speed by an input signal,
The relative rotational speed between the driving body and the driven body is changed while keeping the relative movement direction between the driving surface and the driven surface constant, and the vibration of the driven body is controlled by the connector. A vibro-acoustic generator, wherein the vibro-acoustic generator transmits mechanical vibration or sound wave corresponding to the input signal.

(3) a vibro-acoustic generator,
A motor in which a driving body that generates a rotational driving force on a driving surface by an input signal and a driven body having a driven surface that is driven to face the driving surface are paired so as to be relatively rotatable; ,
At least one inertia disk having a polar rotation moment of inertia equal to or greater than that of the driving body, and a rotating shaft in which the driven body is integrally fixed; and
At least one bearing installed between the driving body and the rotating shaft and rotatably supporting the driving body around the rotating shaft;
At least one bearing installed between the rotating shaft and a bearing support and supporting the rotating shaft and the driven body so as to be continuously rotatable around a rotation center coordinate axis of the driven body;
An elastic support member that is installed between the driving body and the stationary body and limits a rotatable range of the driving body;
2 types of motor vibration devices composed of
A vibro-acoustic body that expresses input vibration as mechanical vibration or sound wave;
A coupling member that couples two sets of the driving bodies of the two types of motor vibration devices in which the rotation shaft is arranged on the same rotation center coordinate axis;
A connector for connecting the coupling member and the vibro-acoustic manifesting body to transmit the vibration operation of the driving body to the vibro-acoustic manifesting body;
With
In a state where the two types of motors are continuously rotating in the reverse direction at a predetermined rotational speed in accordance with the input signal, at least one of the two types of driving bodies is supplied with an instantaneous amplitude value of an electric signal as an input signal. By inputting the modulated signal,
The relative rotational speed between the driving body and the driven body is changed while keeping the relative motion direction between the driving surface and the driven surface constant, and the driving body coupled by the coupling member A vibro-acoustic generator characterized by transmitting a vibration operation to the vibro-acoustic body through the connector and generating mechanical vibration or sound wave corresponding to the input signal.

(4) a vibro-acoustic generator,
Two types in which a driving body that generates a rotational driving force on a driving surface by an input signal and a driven body having a driven surface that is driven to face the driving surface are paired so as to be relatively rotatable. Motors,
A rotating shaft on which the two driven bodies are integrally fixed; and
At least two or more bearings installed between the two driving bodies and the rotating shaft and rotatably supporting the driving body around the rotating shaft;
At least one bearing installed between the rotating shaft and a bearing support and supporting the rotating shaft and the driven body so as to be continuously rotatable around a rotation center coordinate axis of the driven body;
An elastic support member that is installed between one of the driving bodies and a stationary body to limit a rotatable range of the driving body;
A bearing support for fixing the other driving body to a stationary body;
A motor vibration device composed of
A vibro-acoustic body that expresses input vibration as mechanical vibration or sound wave;
A connector for connecting the one rotatable driving body and the vibro-acoustic expression body to transmit the vibration operation of the drive body to the vibro-acoustic expression body;
With
In a state where the driving directions of the two types of motors are reversed by the input signal, at least one of the two types of driving bodies is modulated with the instantaneous amplitude value of the electric signal as an input signal. By inputting the signal
The relative rotational speed between the driving body and the driven body is changed while the relative movement direction between the rotatable driving surface and the driven surface is kept constant, and the vibration operation of the driving body is connected to the coupling body. A vibro-acoustic generator, which transmits to a vibro-acoustic body via a child and generates mechanical vibrations or sound waves corresponding to the input signal.

(5) a vibro-acoustic generator,
A motor in which a driving body that generates a rotational driving force on a driving surface by an input signal and a driven body having a driven surface that is driven to face the driving surface are paired so as to be relatively rotatable; ,
At least one inertia disk having a polar rotation moment of inertia equal to or greater than that of the driving body, and a rotating shaft in which the driven body is integrally fixed; and
At least one bearing installed between the driving body and the rotating shaft and rotatably supporting the driving body around the rotating shaft;
At least one bearing installed between the rotating shaft and a bearing support and supporting the rotating shaft and the driven body so as to be continuously rotatable around a rotation center coordinate axis of the driven body;
An elastic support member that is installed between the driving body and the stationary body and limits a rotatable range of the driving body;
At least two or more motor excitation devices configured by:
A vibro-acoustic body that expresses input vibration as mechanical vibration or sound wave;
The drive of the motor vibration device in which the rotating shaft is arranged at an equal angular pitch position on a virtual circle centered on the axially symmetric central axis of the vibro-acoustic body so that the rotating shaft faces a tangential direction of the virtual circle A coupling member that couples the whole body;
A connector for connecting the coupling member and the vibro-acoustic manifesting body to transmit the vibration operation of the driving body to the vibro-acoustic manifesting body;
With
By inputting a signal modulated by an instantaneous amplitude value of an electrical signal as an input signal in a state in which all the number of the motors are continuously rotating continuously at a predetermined rotational speed in the same direction with respect to the central axis by an input signal,
The relative rotational speed between the driving body and the driven body is changed while the relative movement direction between the driving surface and the driven surface is kept constant, and the vibration operation of the driving body is performed via the connector. A vibro-acoustic generator, wherein the vibro-acoustic generator transmits mechanical vibration or sound wave corresponding to the input signal.

(6) The vibro-acoustic generator according to any one of (1) to (5), wherein the motor is a vibration wave motor in which the driven surface is driven by an elastic vibration wave formed on the driving surface.

(7) The connector is an insulating functional member that transmits a force in the central axis direction of the vibro-acoustic body, but does not transmit a force in a direction perpendicular to the central axis to the vibro-acoustic body. Or the vibro-acoustic generator according to any one of (1) to (6), wherein the vibro-acoustic-expressing body or the connecting portion with the driving body is softly coupled.

(8) The vibro-acoustic generator according to (7), wherein the connector is supported by a rectilinear guide so as to move in a central axis direction of the vibro-acoustic body.

According to the apparatus of the present invention configured as described above, the zero-cross point nonlinearity is obtained because the velocity modulation excitation is performed by the signal modulated by the instantaneous amplitude value of the electric signal while the motor is continuously rotating in a constant direction. Since there is no singular phenomenon and the vibration wave is mechanically transmitted directly to the vibro-acoustic body via the connector and driven, the counter electromotive force as generated by a conventional vibration generator using electromagnetic force In addition, no vibration phenomenon or group delay phenomenon occurs, and it is possible to obtain a vibro-acoustic generator having extremely faithful reproducibility especially for low frequency use. When a vibration wave motor is used, a small and light motor can generate a large torque, so that a compact and long-life vibro-acoustic generator can be obtained. Is preferred.

Hereinafter, the present invention will be described in detail by way of an embodiment of a cone-type bass speaker device with reference to the drawings. The present invention is not limited to the cone-type bass speaker device, and can be similarly implemented in the form of a vibration generator and a speaker system. In addition, this vibration generator generates a low frequency vibration or a very low frequency vibration that does not fall within the range of the sound, for example, a noise canceller that generates a vibration having a phase opposite to that of the noise and removes the noise. It can also be used as a vibration sensation device that reproduces an event as an image and sound as well as mechanical movement and air flow. Furthermore, it can also be used as a device for generating low-frequency vibrations in fluids and liquids other than air, such as for investigating tsunami generation behavior.

(First Embodiment) FIG. 1 is an external view showing a configuration concept of a “cone-type bass speaker device 99” of this embodiment, and FIG. 2 shows a motor vibration device section, that is, a motor and an inertia disk. FIG. 3 is a longitudinal sectional view showing a detailed structure of the motor. FIG. FIG. 4 is a schematic diagram showing the driving principle of the vibration wave motor.

First, the driving principle of the vibration wave motor 1 will be briefly described with reference to FIG. The driving body 2 of the vibration wave motor 1 is configured by attaching a piezoelectric ceramic material 21 that expands and contracts by an additional voltage to one side of a metal member. When this piezoelectric ceramic material 21 is arranged at an equal pitch in the circumferential direction and an AC voltage having an electrical phase difference is applied thereto, a progressive elastic strain vibration in the rotational direction in an elliptical motion is generated in the metal member. To do. The driving mechanism of the vibration wave motor 1 is that the driven surface 30 of the driven body 3 is brought into pressure contact with the driving surface 20 and the driven surface 30 is moved by the friction force generated between them. The vibration wave motor 1 can obtain high motor performance with excellent response and controllability and low speed and high torque because the mechanical impedance is high due to the structure of the driving principle.

FIG. 1 shows the appearance of a cone-type bass speaker device 99, and reference numeral 1 denotes a motor 1 that moves the device. As will be described in detail later with reference to FIG. 3, the motor 1 has a driving body 2 and a driven body 3 covered with a cover 9. In FIG. 1, the cover 9 to which the driving body 2 is attached is externally shown. . This drive motor may be an electromagnetic induction type motor, but preferably a vibration wave motor (ultrasonic motor) having the above-mentioned excellent driving characteristics is used. As the vibration wave motor 1, for example, an ultrasonic motor such as USR60E3 commercially available from Shinsei Kogyo Co., Ltd. can be used.

FIG. 2 is a schematic diagram of a longitudinal section of the motor vibration device section, that is, the motor 1, the rotary inertia disk 13, the rotary shaft 4, and the bearing support base 12, and FIG. 3 is an assembly commercially available for use in this embodiment. 1 is a structural cross-sectional view of a vibration wave motor 1 that is generally used as a product. Hereinafter, based on FIG. 2 and FIG. 3, the structure and operation | movement of the cone-type bass speaker apparatus 99 of this embodiment are demonstrated.

As shown in FIG. 3, the structure of the motor 1 is roughly divided into a driving body 2 side and a driven body 3 side. The driven body 3 side is attached to the rotary shaft 4 and supported by upper and lower bearings 5a and 5b between the upper and lower covers 9a and 9b. The driving body 2 side is fixedly attached to the lower cover 9b, and the driving body 2 and the driven body 3 are surrounded by a cover 9 constituted by an upper cover 9a and a lower cover 9b. That is, the driving body assembly 92 and the driven body assembly 93 are configured to be supported by the upper and lower bearings 5a and 5b so that both can freely rotate. A necessary electrical signal is supplied to the piezoelectric ceramic material 21 of the driving body 2 through the voltage input lead 8 via the input terminal 7.

As shown in FIG. 2, the driven body 3 is integrally attached to the rotary shaft 4, and the right side rotary inertia disk 13 a and the left side rotary inertia disk 13 b are similarly fixedly attached to the rotary shaft 4 on both sides thereof. . These driven body assemblies 93 are rotatably supported by the left and right bearings 17a and 17b. The driven body 3 is configured integrally with the cover 9, and the driven body 2 and the driven body 3 are supported by each other so as to be rotatable with respect to the rotation center coordinate axis 60, and are elastic between the stationary body 15. The support member 14 is rotatably supported in a finite range. Further, the connector 9 is connected by a connector 10 between the cover 9 and the vibro-acoustic expression body 11 (in this embodiment, a cone-type speaker corresponds. In the description of the structure, it is referred to as “cone-type speaker” for easy understanding). The vibro-acoustic expression body 11 is fixed to the stationary body 15 with the vibro-acoustic expression body support 16.

Then, by applying a predetermined AC voltage to the driving body 2 via the voltage input lead wire 8, the driving body 2 rotates the driven body 3 and at the same time, the driving body 2 itself is reverse direction by the reaction force. And the generated torque and the elastic support member 14 and the cone type speaker (vibration and sound manifesting body) 11 are settled at a rotation angle that balances the torque generated by the holding force. The driven body 3 is steadily rotated at a constant rotation speed by the driving torque supplied from the driving body 2. That is, in this state, the contact facing surfaces 20 and 30 of the driving body 2 and the driven body 3 move with a speed difference in a relatively fixed direction.

In this state, when a signal modulated by the instantaneous amplitude value of the electrical signal is input from the voltage input lead wire 8, the driven body 2 and the driven body 3 rotate according to their respective polar rotational moments of inertia according to the law of conservation of rotational momentum. Changes in speed and balance position. If the polar rotation inertia moment of the driven body 3 that is normally rotating, that is, the driven body assembly 93 is sufficiently larger than the polar rotation inertia moment of the drive body assembly 92, the polar rotation inertia moment is small. A significant change appears in the rotational angular velocity on the side of the driver 2. Therefore, in this structure, by attaching the two rotary inertias 13a and 13b to the rotary shaft 4, the pole rotating inertia moment of the driven body assembly 93 is increased, and the response sensitivity of the driving body 2 is increased.

The driving body 2 rotates and moves from the angular position that has been settled for this balance, but the relative speed direction of the contact facing surfaces 20 and 30 of the driving body 2 and the driven body 3 that have moved with a relative speed difference. Therefore, it is possible to operate in a region where good linearity can be obtained without causing a sudden change in friction associated with a change in speed direction and a non-linear singular phenomenon at the zero cross point due to a dead zone.

Such rotational fluctuation of the driving body 2 is transmitted to the cone type speaker 11 through the connector 10, and the cone type speaker 11 fixed to the stationary body 15 vibrates, and sound corresponding to the input electric signal is generated.

The connector 10 is L-shaped so that the rotational movement of the driving body 2 can be transmitted to the cone-type speaker 11 as a straight-ahead movement, and one portion 10 a thereof is horizontal toward the center of the cone-type speaker 11. The other portion 10 b is arranged so as to be perpendicular to the center of the motor 1. Further, the connector 10 is made of an elastic structure / material that can tolerate a certain degree of deformation, and can deform and absorb errors in the direction of motion.

In this way, speed modulation excitation is performed using a signal modulated with the instantaneous amplitude value of the electric signal while the motor 1 is continuously rotating in a constant direction, so that a large amplitude vibration at a very low frequency can be reproduced. It becomes possible. Further, by avoiding the zero cross phenomenon by operating in a range in which the relative speed direction of the driving surface 20 and the driven surface 30 is maintained, it is possible to reproduce a signal with high linearity and extremely good reproducibility. Since the pole rotating inertia moment of the driven body assembly 93 is very large as compared with the driving body assembly 92, the response sensitivity is high, and the vibration wave motor 1 capable of generating a large torque even with a small size and light weight is used. Therefore, a low-pitched speaker device 99 that is compact, extremely reproducible, and has a long life can be obtained. In addition, since the electromagnetic force is not used in the above configuration, problems such as the back electromotive force, the resonance phenomenon, and the group delay phenomenon in the conventional dynamic speaker described above do not occur.

(Second Embodiment) FIG. 5 is a cross-sectional view of a motor vibration device. A description of parts with the same name is omitted. In this structure, the vibration wave motor 1 does not use a general-purpose assembly surrounded by the cover 9 as shown in FIG. 3, but the driving body 2, the driven body 3, the rotating shaft 4, and the bearing support base. 12 are sequentially assembled as a device. That is, the driving body 2 is rotatably attached to the rotary shaft 4 by the central bearing 17c, and is further supported by the stationary body 15 in a state where the rotational range is restricted by the elastic support member 14. The driven body 3 is pressurized to the driving surface 20 of the driving body 2 by the preloading material 18 and is integrally attached to the rotating shaft 4. Similarly, two rotary inertia disks 13a and 13b are integrally attached to the rotary shaft 4, and both ends are supported by two bearings 17a and 17b so as to be continuously rotatable. Unlike the first embodiment, there is no cover 9 that integrally surrounds the driven body 3 with the driving body 2, and the connector 10 is directly attached to the driving body 2 and connected to the cone type speaker 11.

By adopting such a configuration, the polar rotation moment of inertia of the driving body 2 and the cover 9 is suppressed to be small, and the response sensitivity is further improved as compared with the first embodiment. In addition, the total number of bearings 5 and 17 has been reduced, enabling cost reduction.

(Third Embodiment) FIG. 6 is a schematic cross-sectional view of a motor vibration device. FIG. 7 shows a cross-sectional view of the motor vibration device. In this structure, unlike the previous structure, the driving unit 2 continuously rotates, the driven body 3 rotates within a limited range, and the range of the angle change is transmitted to the cone type speaker 11 by the connector 10. Yes.

Due to the drive mechanism of the vibration wave motor 1, a member for operating as a motor such as the piezoelectric ceramic material 21 is attached to the drive body 2 side, and the polar rotation inertia moment becomes large. Compactness is possible. In addition, since the drive body 2 rotates, the input signal is introduced through the slip ring 19 of the mercury bath.

(Fourth Embodiment) FIG. 8 is a schematic cross-sectional view of a motor vibration device section. In this structure, two sets of motor vibration devices having motors 101a and 101b and rotary inertia disks 113a and 113b attached to rotary shafts 104a and 104b are arranged on the same rotation center coordinate axis. The two driving bodies 102 a and 102 b are coupled by a coupling member 19, and a coupling member 10 is attached to the coupling member 19 and coupled to the cone type speaker 11.

  Since the two types of motors 101a and 101b are set so as to rotate by the same amount in the opposite direction, the combined driving bodies 102a and 102b balance the torques acting on each of them and do not add a steady rotational torque, and are constant. It is settled at the angular position. In such a configuration, when a modulation signal is input to one motor during operation at the rated rotation, the rotational inertia on the side of the driving bodies 102a and 102b is larger than that of the structure of the first embodiment, and the driven bodies 103a and 103b are driven. Since the rotational momentum on the side is large, the coupled two driving bodies 102a and 102b respond with high sensitivity and good reproducibility can be obtained. In addition, since the characteristics change due to heat generation during operation are canceled and averaged, stable characteristics can be obtained.

(Fifth Embodiment) FIG. 9 is a schematic cross-sectional view of a motor vibration device section. In this structure, two motors 201a and 201b are attached to one rotating shaft 204, the driving body 202a of one motor 201a is fixed to the stationary body 15, and the driving body 202b of the other motor 201b is connected to the connector 10. Is connected to the cone-shaped speaker 11.

Since the two motors 201a and 201b rotate in opposite directions and have a large rotational momentum, when a modulation signal is input to one of the motors, the response of the driver 202b appears remarkably and the sensitivity is high. Become.

(Sixth Embodiment) FIG. 10 shows a schematic sectional view and a plan view of the entire configuration. In this structure, the motors 301a, 301b, and 301c are arranged in the tangential direction of the virtual circle centered on the central axis 361 so that the motors 301a, 301b, and 301c are equally divided around the axially symmetrical central axis 361 of the cone-shaped speaker 11. , 301b, 301c are arranged so that the rotating shafts 304a, 304b, 304c face each other, and rotate in a fixed direction with respect to the central axis 361. The plurality of motor drivers 302a, 302b, and 302c are coupled by a coupling member 306, and the coupling member 306 and the central portion of the cone type speaker 11 are coupled by a connector 310 at the center. The coupling member 306 is made of an elastic member such as metal or rubber, and is deformed according to the rotational movement amount of the motor and attenuates and removes unnecessary noise.

When the modulation signals are simultaneously input to the driving bodies 302a, 302b, and 302c of the respective motors to generate rotational fluctuation vibrations, the coupling member 306 has an axisymmetric shape. A linear motion is generated in the central axis direction, and a response with higher linearity can be obtained. That is, unlike a conventional structure, a mechanism such as winding is unnecessary, and a simple and highly reliable low-cost structure can be obtained.

  The structure shown in FIG. 10 is a structure in which three motors 301a, 301b, and 301c are arranged at a 120 ° pitch. However, as shown in FIG. 11, two motors 401a and 401b are arranged at a 180 ° pitch. Also good. In the structure of FIG. 11, a linear motion guide 450 is provided so that the connector 410 linearly moves in the direction of the central axis of the cone speaker 11, and the movement of the connector 410 is regulated and guided, thereby providing a cone type. A large moment is applied to the speaker 11 to prevent it from being damaged.

(Seventh Embodiment) FIG. 12 shows a structure in which a connecting spring 551 is installed at a connecting portion between the connector 10 and the cone type speaker 11. The connection spring 551 may be installed at an intermediate portion of the connector 10 or may be installed between the connector 10 and the motor 1.

In FIG. 13, a sliding pivot bearing 652 having a degree of freedom in sliding and tilting motion directions is arranged at the connecting portion between the connector 610 and the cone type speaker 11, and the speaker is displaced and tilted by a position adjusting spring 653 so as to be freely tilted. The elastically supported structure is shown.

In this way, the rotational behavior of the connector 610 can be absorbed, an excessive moment can be avoided from being applied to the cone type speaker 11, and the life can be extended.

(Other Embodiments) The embodiments of the present invention can be modified in various ways without departing from the spirit of the invention in addition to the above-described embodiments. For example, in the above configuration, a ball bearing support motor structure that is inexpensive and easy to handle is illustrated, but the bearing that supports the motor is not limited to this, and an oil-impregnated bearing, a bearing with a dynamic pressure groove, or Various other commonly used bearings such as solid lubricated plain bearings may be used. By using these bearings, it is possible to avoid vibration noise caused by the rolling of the balls unique to the ball bearings.
Further, when the driving body 2 connected with the voltage input lead wire 8 rotates, a part of the lead wire 8 is fixed so that the joint portion of the lead wire 8 is not stressed and damaged. It may be tied or a relay point may be provided in the middle.
Further, in a structure in which the driving body 2 is continuously rotated, power may be input using a metal contact type contact using an electric brush instead of the slip ring 19. Then, the cost can be further reduced and the rotation speed can be increased.
Furthermore, although the structure of the cone type speaker 11 has been described above, a curved cone type or a flat plate type may be used.

(Embodiments for Other Uses) Further, the application example as the low-frequency speaker device 99 has been described above. However, it may be used as an active control type sound insulation device by adjusting the input signal so as to generate a sound wave having an opposite phase with respect to the radiated noise with the same system structure.
Furthermore, the above is an example of using a lightweight flexible speaker that vibrates ambient air and easily generates sound waves as a vibro-acoustic exhibiting body. By attaching to a structure (for example, a human body object such as a chair) that easily propagates vibration, it can also be used as a vibration body sensation sound device that allows a low frequency vibration to be experienced with good reproducibility.

A third example of the present invention was prototyped using an ultrasonic motor having a diameter of 6 cm and a vibro-acoustic material having a diameter of 25 cm, and the characteristics were measured. The results are shown in FIG.
In conventional speakers, the response of 40 to 60 Hz or less is usually lowered sharply, but this prototype shows good frequency characteristics from low frequency despite being handmade with existing parts. ing. The operation performance by actual voice and music signals is also good, and the effect of the present invention has been proved by this trial manufacture study.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an overall overview showing a configuration concept of a bass speaker device according to the present invention. It is a longitudinal cross-sectional schematic diagram of the motor vibration apparatus part of the speaker apparatus for low sounds in 1st Example of this invention. It is a longitudinal cross-sectional view of the vibration wave motor used for the 1st Embodiment of this invention. It is a schematic diagram explaining the drive principle of a vibration wave motor. It is a longitudinal cross-sectional view of the motor vibration apparatus part of the low-pitched speaker apparatus in 2nd Example of this invention. It is a longitudinal cross-sectional schematic diagram of the motor vibration apparatus part of the speaker apparatus for low sounds in 3rd Example of this invention. It is a longitudinal cross-sectional view of the motor vibration apparatus part of the speaker apparatus for low sounds in 3rd Example of this invention. It is a longitudinal cross-sectional schematic diagram of the motor vibration apparatus part of the speaker apparatus for low sounds in the 4th Example of this invention. It is a longitudinal cross-sectional schematic diagram of the motor vibration apparatus part of the speaker apparatus for low sounds in the 5th Example of this invention. It is the cross-sectional schematic diagram by the side of the motor apparatus of the speaker apparatus for low sounds in the 6th Example of this invention, and a top view (when there are three motors). It is a cross-sectional schematic diagram by the side of the motor apparatus of the low-pitched speaker apparatus in the 6th Example of this invention (when there are two motors). It is the attachment part structure schematic diagram (in the case of a spring) of the connector of the speaker apparatus for low sounds in the 7th Example of this invention. It is the attachment part structure schematic diagram (in the case of a sliding pivot bearing) of the connector of the speaker apparatus for low frequencies in the 7th example of the present invention. It is a figure which shows schematic structure of the speaker apparatus for forward / reverse rotation drive system low-pitched sound using the conventional vibration rotation type motor. It is a figure which shows the example of characteristic measurement data of the speaker apparatus for low sounds in 3rd Example of this invention.

Explanation of symbols

1, 101a, 101b, 201a, 201b, 301a, 301b, 301c, 401a, 401b, 901 Motor 2, 102a, 102b, 302a, 302b, 302c Drive body 3, 103a, 103b Driven body 4, 104a, 104b, 204 304a, 304b, 304c Rotating shaft 5a, 5b, 5c Bearing 6, 106, 306, 406 Connecting member 7 Input terminal 8 Voltage input lead 9 Cover 9a Upper cover 9b Lower cover 10, 10a, 10b, 310, 610, 910a, 910b Connector 11, 911 Cone type speaker (vibration and sound expression body)
12, 12a, 12b, 12c, 112a, 112b, 112c, 212a, 212b
Bearing support bases 13, 13 a, 13 b, 13 c, 113 a, 113 b, rotary inertia disk 14 elastic support material 15 stationary body 16 cone type speaker (vibration acoustic expression body) support bases 17, 17 a, 17 b, 17 c Bearing 18 preload addition material 19 Slip ring 20 Driving surface 21 Piezoelectric ceramic material 30 Driven surface 50, 450 Linear motion guide 51, 551 Connecting spring 52, 652 Sliding pivot bearing 53, 653 Position adjusting spring 60 Rotation center coordinate axes 61, 361, 461, 561, 661 Cone-shaped speaker axis symmetrical central axis 92 Driving body assembly 93 Driven body assembly 99 Cone type low-frequency speaker device

Claims (8)

A vibro-acoustic generator,
A motor in which a driving body that generates a rotational driving force on a driving surface by an input signal and a driven body having a driven surface that is driven to face the driving surface are paired so as to be relatively rotatable; ,
At least one inertia disk having a polar rotation moment of inertia equal to or greater than that of the driving body, and a rotating shaft in which the driven body is integrally fixed; and
At least one bearing installed between the driving body and the rotating shaft and rotatably supporting the driving body around the rotating shaft;
At least one bearing installed between the rotating shaft and a bearing support and supporting the rotating shaft and the driven body so as to be continuously rotatable around a rotation center coordinate axis of the driven body;
An elastic support member that is installed between the driving body and the stationary body and limits a rotatable range of the driving body;
A motor vibration device composed of
A vibro-acoustic body that expresses input vibration as mechanical vibration or sound wave;
A connector for connecting the driving body and the vibro-acoustic expression body to transmit the vibration operation of the driving body to the vibro-acoustic expression body;
With
By inputting a signal modulated with an instantaneous amplitude value of an electric signal as an input signal in a state where the motor is continuously rotating at a predetermined rotation speed by an input signal,
The relative rotational speed between the driving body and the driven body is changed while the relative movement direction between the driving surface and the driven surface is kept constant, and the vibration operation of the driving body is performed via the connector. A vibro-acoustic generator, wherein the vibro-acoustic generator transmits mechanical vibration or sound wave corresponding to the input signal. A vibro-acoustic generator,
A motor in which a driving body that generates a rotational driving force on a driving surface by an input signal and a driven body having a driven surface that is driven to face the driving surface are paired so as to be relatively rotatable; ,
An input terminal for transmitting an input signal to the continuously rotating driving body;
An inertia ring integrally attached to the driving body and having a polar rotation inertia moment equal to or greater than that of the driven body;
A rotating shaft on which the driven body is integrally fixed; and
At least one bearing installed between the driving body and the rotating shaft and supporting the driving body so as to be continuously rotatable around the rotating shaft;
At least one bearing installed between the rotating shaft and a bearing support and rotatably supporting the rotating shaft and the driven body around a rotation center coordinate axis of the driven body;
A motor vibration device composed of
A vibro-acoustic body that expresses input vibration as mechanical vibration or sound wave;
A connector for connecting the driven body or the rotating shaft and the vibro-acoustic expression body to transmit the vibration operation of the driven body to the vibro-acoustic expression body;
With
By inputting a signal modulated with an instantaneous amplitude value of an electric signal as an input signal in a state where the motor is continuously rotating at a predetermined rotation speed by an input signal,
The relative rotational speed between the driving body and the driven body is changed while keeping the relative movement direction between the driving surface and the driven surface constant, and the vibration of the driven body is controlled by the connector. A vibro-acoustic generator, wherein the vibro-acoustic generator transmits mechanical vibration or sound wave corresponding to the input signal. A vibro-acoustic generator,
A motor in which a driving body that generates a rotational driving force on a driving surface by an input signal and a driven body having a driven surface that is driven to face the driving surface are paired so as to be relatively rotatable; ,
At least one inertia disk having a polar rotation moment of inertia equal to or greater than that of the driving body, and a rotating shaft in which the driven body is integrally fixed; and
At least one bearing installed between the driving body and the rotating shaft and rotatably supporting the driving body around the rotating shaft;
At least one bearing installed between the rotating shaft and a bearing support and supporting the rotating shaft and the driven body so as to be continuously rotatable around a rotation center coordinate axis of the driven body;
An elastic support member that is installed between the driving body and the stationary body and limits a rotatable range of the driving body;
2 types of motor vibration devices composed of
A vibro-acoustic body that expresses input vibration as mechanical vibration or sound wave;
A coupling member that couples two sets of the driving bodies of the two types of motor vibration devices in which the rotation shaft is arranged on the same rotation center coordinate axis;
A connector for connecting the coupling member and the vibro-acoustic manifesting body to transmit the vibration operation of the driving body to the vibro-acoustic manifesting body;
With
In a state where the two types of motors are continuously rotating in the reverse direction at a predetermined rotational speed in accordance with the input signal, at least one of the two types of driving bodies is supplied with an instantaneous amplitude value of an electric signal as an input signal. By inputting the modulated signal,
The relative rotational speed between the driving body and the driven body is changed while keeping the relative motion direction between the driving surface and the driven surface constant, and the driving body coupled by the coupling member A vibro-acoustic generator characterized by transmitting a vibration operation to the vibro-acoustic body through the connector and generating mechanical vibration or sound wave corresponding to the input signal. A vibro-acoustic generator,
Two types in which a driving body that generates a rotational driving force on a driving surface by an input signal and a driven body having a driven surface that is driven to face the driving surface are paired so as to be relatively rotatable. Motors,
A rotating shaft on which the two driven bodies are integrally fixed; and
At least two or more bearings installed between the two driving bodies and the rotating shaft and rotatably supporting the driving body around the rotating shaft;
At least one bearing installed between the rotating shaft and a bearing support and supporting the rotating shaft and the driven body so as to be continuously rotatable around a rotation center coordinate axis of the driven body;
An elastic support member that is installed between one of the driving bodies and a stationary body to limit a rotatable range of the driving body;
A bearing support for fixing the other driving body to the stationary body;
A motor vibration device composed of
A vibro-acoustic body that expresses input vibration as mechanical vibration or sound wave;
A connector for connecting the one rotatable driving body and the vibro-acoustic expression body to transmit the vibration operation of the drive body to the vibro-acoustic expression body;
With
In a state where the driving directions of the two types of motors are reversed by the input signal, at least one of the two types of driving bodies is modulated with the instantaneous amplitude value of the electric signal as an input signal. By inputting the signal
The relative rotational speed between the driving body and the driven body is changed while the relative movement direction between the rotatable driving surface and the driven surface is kept constant, and the vibration operation of the driving body is connected to the coupling body. A vibro-acoustic generator, which transmits to a vibro-acoustic body via a child and generates mechanical vibrations or sound waves corresponding to the input signal. A vibro-acoustic generator,
A motor in which a driving body that generates a rotational driving force on a driving surface by an input signal and a driven body having a driven surface that is driven to face the driving surface are paired so as to be relatively rotatable; ,
At least one inertia disk having a polar rotation moment of inertia equal to or greater than that of the driving body, and a rotating shaft in which the driven body is integrally fixed; and
At least one bearing installed between the driving body and the rotating shaft and rotatably supporting the driving body around the rotating shaft;
At least one bearing installed between the rotating shaft and a bearing support and supporting the rotating shaft and the driven body so as to be continuously rotatable around a rotation center coordinate axis of the driven body;
An elastic support member that is installed between the driving body and the stationary body and limits a rotatable range of the driving body;
At least two or more motor excitation devices configured by:
A vibro-acoustic body that expresses input vibration as mechanical vibration or sound wave;
The drive of the motor vibration device in which the rotating shaft is arranged at an equal angular pitch position on a virtual circle centered on the axially symmetric central axis of the vibro-acoustic body so that the rotating shaft faces a tangential direction of the virtual circle A coupling member that couples the whole body;
A connector for connecting the coupling member and the vibro-acoustic manifesting body to transmit the vibration operation of the driving body to the vibro-acoustic manifesting body;
With
By inputting a signal modulated by an instantaneous amplitude value of an electrical signal as an input signal in a state in which all the number of the motors are continuously rotating continuously at a predetermined rotational speed in the same direction with respect to the central axis by an input signal,
The relative rotational speed between the driving body and the driven body is changed while the relative movement direction between the driving surface and the driven surface is kept constant, and the vibration operation of the driving body is performed via the connector. A vibro-acoustic generator, wherein the vibro-acoustic generator transmits mechanical vibration or sound wave corresponding to the input signal. 6. The vibroacoustic generator according to claim 1, wherein the motor is a vibration wave motor in which the driven surface is driven by an elastic vibration wave formed on the driving surface. The connector is a part of an insulating functional member that transmits a force in the axially symmetric central axis direction of the vibro-acoustic manifestation body but does not transmit a force in a direction perpendicular to the axially symmetric central axis to the vibroacoustic manifestation body. The vibro-acoustic generator according to any one of claims 1 to 6, wherein the vibro-acoustic generator is provided with an elastic portion, or the vibro-acoustic-expressing body or the connecting portion with the driving body is softly coupled. The vibro-acoustic generator according to claim 7, wherein the connector is supported by a rectilinear guide so as to move in the axially symmetric central axis direction of the vibro-acoustic body.

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