JP2007158658A - Speaker device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a speaker device capable of controlling a sounding direction such as sound collection and sound dispersion with a simple configuration without using a plurality of speaker units. <P>SOLUTION: A condenser speaker 2 with flexibility deformable to a recessed curved face, a planar shape, and a projected curved face is used for a flat board speaker unit of the speaker device 1. When a control section 43 detects a setting entry associated with the shape of the condenser speaker 2 from an operation section 41, the control section 43 reads data corresponding to an input value and data of an extended length set previously from a storage section 42, outputs a pulse signal calculated on the basis of the data to each of stepping motors 33A to 33D to change the extended length of each of moving arms 6A to 6D from a support 3 thereby deforming the flat board speaker unit. Thus, the single speaker unit switches a sounding range to output the sound to a desired range. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a speaker device capable of deforming the shape of a flexible flat speaker unit.

  Conventionally, there has been a flat capacitor speaker as a speaker having directivity in a single direction (see, for example, Patent Document 1).

  In addition, as a speaker that concentrates sound at one point, there has been a device that combines a radiation surface reflector and a speaker (see, for example, Patent Document 2).

Furthermore, by arranging a plurality of speaker units in an array and adjusting the timing and gain at which sound is output from each speaker unit, the sound output from each speaker unit can be emitted so as to be focused. There was a speaker array (see, for example, Patent Document 3).
JP 2000-295691 A Japanese Patent Laid-Open No. 04-339494 Japanese Patent No. 3067140

  As described above, the shape of the conventional speaker is set according to each purpose. For this reason, for example, it has not been possible to pick up sound at a single point using a flat speaker.

  On the other hand, in the stereophonic sound reproduction method described in Patent Document 3, by adjusting the timing and gain at which sound is output from each speaker, as described above, not only the sound is emitted so as to be focused, but also in a single direction. Can be given directionality and can spread sound.

  However, in the speaker array, in order to direct or diffuse the sound to be emitted, a delay circuit and a gain adjustment circuit are provided for each speaker unit constituting the speaker array to control the operation of each circuit. It is necessary to do this, and the control is complicated. In addition, the speaker array has a problem in that a large number of speaker units are required to form a wide-band sound field, which is expensive.

  Accordingly, an object of the present invention is to provide a speaker device that can control the sound emitting direction of sound, such as sound collection and diffusion, with a simple configuration without using a plurality of speaker units.

  The present invention has the following configuration as means for solving the above problems.

(1) A flat panel speaker unit that includes a flexible panel-like diaphragm and emits sound in accordance with an input audio signal;
An operation means for receiving an operation of setting the flat speaker unit to a concave curved surface shape, a planar shape, or a convex curved surface shape;
Deformation means for deforming the flat speaker unit into a shape corresponding to a reception operation by the operation means;
It is provided with.

  In this configuration, when the shape of the flat speaker unit is set to any one of a concave curved surface shape, a flat surface shape, and a convex curved surface shape by the operation means, the deforming means deforms the flat plate speaker unit into the set shape. Therefore, it is possible to switch the range of sound emission according to the usage status of the speaker device and the surrounding conditions. That is, when the flat speaker unit is set to be flat, it is possible to generate a sound field in which sound reaches far away with strong straightness and low attenuation. Further, when the flat speaker unit is set to have a convex curved surface shape, it is possible to diffuse the sound so that the sound reaches a wide range. Furthermore, when the flat speaker unit is set to a concave curved surface, the sound can be concentrated at one point (focal point), so that the sound reaches only a narrow range, and the sound diffuses and attenuates behind the focal point. Therefore, it is possible to make it difficult for sound leakage to occur. Further, when the flat speaker unit is formed in a convex curved surface shape or a concave curved surface shape, the range in which the speaker device emits sound can be set finely by setting the curvature of the curved surface finely.

  (2) The flat plate type speaker unit is a flat plate type capacitor speaker including a flexible electrode and a diaphragm.

  In this configuration, the speaker unit is set to be a flat capacitor speaker having a configuration in which a flexible electrode and a diaphragm are opposed to each other, unlike a structure having a voice coil like a dynamic speaker. The speaker unit can be freely deformed according to the shape.

  (3) The deformation means includes a fixing means for fixing a central portion of the capacitor speaker, and a movable means for pushing and pulling an end portion of the capacitor speaker.

  In this configuration, the center portion of the capacitor speaker is fixed by the fixing means, and the end portion is pushed and pulled by the movable means. Therefore, by changing the curvature of the capacitor speaker, it can be easily transformed into any shape of a concave curved surface, a flat surface, or a convex curved surface.

  According to the present invention, the flat speaker unit of the speaker device has flexibility, and the curvature of the flat speaker unit is changed by setting with the operation means, so that the concave curved surface, the flat surface, or Since the flat speaker unit can be deformed into any shape of a convex curved surface, the range of sound emission can be switched by one speaker device, and the sound can be emitted within a desired range.

  Further, according to the speaker device of the present invention, the range of sound emission can be controlled using one speaker unit, so that the configuration of the speaker device is not complicated and the cost can be suppressed, and the phase shift Is less likely to occur, and accurate control of the sound emission direction is possible.

  First, the overall configuration of the speaker device will be described. FIG. 1 is a perspective view showing a schematic configuration of the speaker device.

  As shown in FIG. 1, the speaker device 1 includes a capacitor speaker 2, which is a flat speaker unit, a support column 3, a bottom plate 4, a fixed arm 5, movable arms 6A, 6B, 6C, and 6D, and movable mechanisms 7A, 7B, and 7C.・ It has 7D.

  The capacitor speaker 2 emits a sound corresponding to a sound signal input from the outside. Further, the capacitor speaker 2 is a flat rectangular shape and has flexibility, and its shape can be changed to a flat shape, a concave curved surface shape, or a convex curved surface shape by the movable arms 6A to 6D. It is possible to control the sound emission range. The detailed structure of the capacitor speaker 2 will be described later.

  The support column 3 supports the sound emission surface of the capacitor speaker 2 so as to be substantially perpendicular to the bottom plate 4. The support column 3 is formed with holes 3A, 3B, 3C, and 3D through the movable arms 6A to 6D at each end thereof. Moreover, the support | pillar 3 has the fixed arm 5 attached to the center part. Further, the support column 3 is formed in a shape that does not come into contact with the capacitor speaker 2 when the capacitor speaker 2 is deformed into a convex curved surface (in the drawing, a convex curved surface).

  The bottom plate 4 erects the column 3 to which the capacitor speaker 2 is connected.

  The fixed arm 5 is for fixing the capacitor speaker 2 to the support column 3, and one end thereof is fixed to the center portion of the capacitor speaker 2 and the other end is fixed to the center portion of the support column 3.

  The movable arms 6A, 6B, 6C, and 6D are for changing the curvature of the condenser speaker 2 and changing its shape. One end of each of the movable arms 6A, 6B, 6C, and 6D is fixed to each end of the condenser speaker 2, and the other end is the support column 3. Any one of the holes 3 </ b> A to 3 </ b> D is extended to the back surface of the column 3.

  The movable mechanisms 7 </ b> A, 7 </ b> B, 7 </ b> C, and 7 </ b> D change the length by which the movable arms 6 </ b> A to 6 </ b> D attached to the ends of the condenser speaker 2 extend from the holes 3 </ b> A to 3 </ b> D of the column 3. The distance between the end portion of the speaker 2 and the support column 3 is changed, and the capacitor speaker 2 is deformed into a flat shape, a concave curved surface shape, or a convex curved surface shape.

  Next, a detailed configuration of the capacitor speaker 2 will be described. FIG. 2 is a schematic configuration diagram of a capacitor speaker. As shown in FIG. 2 (A), the condenser speaker 2 has a breathable structure with insulators 15 and 16 interposed between meshed flat and rectangular fixed electrodes (positive and negative electrodes) 12 and 13, respectively. A flat movable diaphragm 14 made of a conductive thin film is disposed opposite to the fixed electrodes 12 and 13.

  The fixed electrodes 12 and 13 of the capacitor speaker 2 are made of a flexible material such as polyethylene terephthalate (PET). The thickness of the capacitor speaker 2 is, for example, about 5 mm. The capacitor speaker 2 is normally flat, but can be deformed into a concave curved surface or a convex curved surface when an external force is applied. In addition, there is a gap between the fixed electrodes 12 and 13 and the movable diaphragm 14 so that the movable diaphragm 14 can vibrate without problems even when the capacitor speaker 2 is deformed by the movable arms 6A to 6D as will be described later. Is set.

  As shown in FIG. 2B, an amplifier (power amplifier) 21 and a bias power source 22 are connected to the capacitor speaker 2 in order to operate the capacitor speaker 2 as a speaker. That is, the audio signal input from the input terminal 20 is amplified by the voltage amplifier 21P, and a voltage corresponding to this signal is applied to the fixed electrode 13 on the front side of the capacitor speaker 2, and the phase is inverted by the inverting voltage amplifier 21N. The voltage corresponding to this signal is applied to the fixed electrode 12 on the rear surface side of the capacitor speaker 2. The capacitor speaker 2 is applied with a bias voltage from the bias power source 22, and vibrates due to the attractive force / repulsive force generated according to the potential difference between the fixed electrodes 12 and 13, thereby generating an air vibration that becomes a sound wave.

  Next, details of the configuration for deforming the shape of the capacitor speaker 2 will be described. FIG. 3 is a diagram for explaining a configuration for deforming the shape of the capacitor speaker, and FIG. 3 (A) is a top perspective view showing an example of a configuration for deforming the capacitor speaker. FIG. 3B is a specific configuration diagram of the movable mechanism 7A. FIG. 3C is a top perspective view illustrating an example of a configuration different from that in FIG. 3A in which the capacitor speaker is deformed.

  As shown in FIG. 3A, each of the movable arms 6A to 6D is curved with a predetermined curvature, and screw grooves 6AM to 6DM are provided from one end to the other end. Further, as shown in FIG. 3B, a gear 31A constituting the movable mechanism 7A is provided on the surface of the support column 3 opposite to the surface facing the condenser speaker 2 (hereinafter referred to as the back surface 3BB of the support column 3). A gear 32A and a stepping motor 33A are attached. The gear 31A is for adjusting the extension length of the movable arm 6A from the column 3, and a hole 31A1 is formed in the center, and the wall surface of the gear 31A is screwed into the screw groove 6AM of the movable arm 6A. Is formed. The movable arm 6A is inserted (penetrated) into the hole 31A1, and the extension length of the movable arm 6A is changed by rotating the gear 31A. The gear 32A is for rotating the gear 31A, and the shaft of the stepping motor 33A is connected to the center. The stepping motor 33A is for rotating the gear 31A, and transmits power to the gear 31A via the gear 32A to change the extension length of the movable arm 6A from the support column 3.

  3B shows only the movable mechanism 7A, the movable mechanisms 7B, 7C, and 7D have the same configuration as the movable mechanism 7A.

  In order to change the shape of the capacitor speaker 2, it is also possible to configure as shown in FIG. In other words, straight movable arms 6A to 6D are used, and ball joints or universal joints 6AJ to 6DJ are provided at one end of each movable arm 6A to 6D. These joints are connected to each end of the rectangular capacitor speaker 2. Similarly to FIG. 3A, the movable arm 6A is entirely screwed from one end to the other end, and the other end is passed through the holes 3A to 3D and the gears 31A to 31D of the column 3. . And the extension length from the support | pillar 3 of each movable arm 6A-6D is adjusted by operating movable mechanism 7A-7D.

  FIG. 4 is a top view of the speaker device. As shown in FIG. 4A, the extension length of the movable arms 6A to 6D from the support column 3 is adjusted so that the shape of the capacitor speaker 2 is deformed into a flat shape, a concave curved surface shape, and a convex curved surface shape. it can.

  As shown in FIG. 4A, the capacitor speaker 2 can be planarized by setting the lengths of the movable arms 6A to 6D extending from the back surface of the support column 3 to the reference values. In this case, as shown in FIG. 4B, since the sound wave emitted from the capacitor speaker 2 has a strong straightness, a sound field in which sound is propagated far away with little attenuation can be generated.

  As shown in FIG. 4C, the length of the movable arms 6A to 6D extending from the back surface of the support column 3 is set to a value shorter than the reference value, so that the capacitor speaker 2 has a concave curved surface (cylindrical shape). ). In this case, as shown in FIG. 4D, the sound wave emitted from the condenser speaker 2 can be concentrated at one point (focal point). In the distance or far away, it is possible to form a sound field that is attenuated due to diffusion of sound and hardly leaks.

  As shown in FIG. 4E, the length of the extension of the movable arms 6A to 6D from the surface of the column 3 is set to a value longer than the reference value, so that the capacitor speaker 2 has a convex curved surface (cylindrical shape). ). In this case, as shown in FIG. 4F, since the sound wave emitted from the capacitor speaker 2 can be diffused, the sound can be propagated over a wide range.

  Further, when the length of the movable arms 6A to 6D extending from the surface of the column 3 is changed and the shape of the condenser speaker 2 is deformed into a concave curved surface or a convex curved surface, the curvature of the curved surface is set finely. Thus, the position of the focal point of the sound and the range in which the sound is diffused can be freely changed.

  Next, a control system for deforming the shape of the capacitor speaker 2 in the speaker device will be described. FIG. 5 is a block diagram of the speaker device.

  The speaker device 1 includes an operation unit 41, a storage unit 42, and a control unit 43.

  The operation unit 41 is for the user to set the shape of the capacitor speaker 2. The operation unit 41 is provided with a shape setting button for setting the shape of the capacitor speaker 2, a numeric keypad for inputting a focal position and a diffusion angle, and the like. The user selects the shape (planar shape, convex curved surface shape, concave curved surface shape) of the condenser speaker 2 from the operation unit 41, the range (sound emission angle) for emitting sound when the convex curved surface shape is selected, and the concave shape. When the curved surface is selected, the position of the focal point (focal length from the speaker device) for collecting the sound can be set.

  The storage unit 42 stores the extension lengths of the movable arms 6A to 6D according to the focal length and the sound emission angle input from the operation unit 41, the extension length data set last time, and the like.

  When the control unit 43 detects a setting input related to the shape of the capacitor speaker 2 from the operation unit 41, the data corresponding to the input value, the extension length data set last time (that is, the currently set value), and Are output from the storage unit 42, and pulse signals corresponding to the read data are output to the stepping motors 33A to 33D to change the extension lengths of the movable arms 6A to 6D from the column 3. At this time, the control unit 43 outputs a pulse signal to each of the stepping motors 33A to 33D so that the extending lengths of the movable arms 6A to 6D are equal.

  Next, an operation of changing the shape of the capacitor speaker in the speaker device will be described based on a flowchart. FIG. 6 is a flowchart for explaining the operation of the speaker device.

  When the user wants to change the sound emission range of the speaker device 1, the user operates the operation unit 41 to change the shape of the capacitor speaker 2. For example, when it is desired to provide a focal position 1 meter ahead of the speaker device 1 so as not to diffuse sound around, the button for setting the capacitor speaker 2 to a concave curved surface is operated, and then the numeric keypad is operated. Enter 100 (cm). In addition, when it is desired to provide straightness so that the sound emitted from the speaker device 1 reaches far, a button for setting the capacitor speaker 2 in a flat shape is operated. In addition, if you want to emit sound in the range of 120 degrees ahead of the condenser speaker 2 so that the sound is diffused around, operate the button to set the condenser speaker 2 to a convex curved surface, and then operate the numeric keypad And input 120 (degrees).

  When the control unit 43 detects that the sound emission range is set in the operation unit 41 (s1), the control unit 43 reads data (pulse signal) corresponding to the set value input in the operation unit 41 from the storage unit 42 (s2). . Further, data representing the current state (shape) of the capacitor speaker 2 is read from the storage unit 42 (s3). And the control part 43 calculates | requires the number of pulse signals output to each stepping motor 33A-33D by calculation based on these data (s4). And the pulse signal of the number calculated | required by calculation is output to stepping motor 33A-33D, and the extension length of movable arm 6A-6D is changed (s5). Thereby, the shape of the capacitor speaker 2 becomes the shape set by the user through the operation unit 41.

  In this way, by changing the shape of the capacitor speaker 2 and inputting the audio signal from the input terminal 20, the sound can be emitted from the speaker device 1 to a desired range of the user.

  As described above, according to the speaker device of the present invention, the sound emission direction can be controlled with a simple configuration without using a plurality of speaker units and without increasing the cost.

  In the above description, the case where the capacitor speaker 2 is used as the flat speaker unit of the speaker device 1 has been described. However, the present invention is not limited to this, and the diaphragm has flexibility. Further, for example, a panel-type dynamic speaker may be used as long as the shape of the diaphragm can be changed to a convex curved surface, a planar shape, or a concave curved surface.

It is a perspective view which shows schematic structure of a speaker apparatus. It is a schematic block diagram of a capacitor speaker. It is a figure for demonstrating the structure which deform | transforms the shape of a capacitor | condenser speaker. It is a top view of a speaker device. It is a block diagram of a speaker apparatus. It is a flowchart for demonstrating operation | movement of a speaker apparatus.

Explanation of symbols

    1-speaker device 2-condenser speaker 3-support 3A-3D-hole 4-bottom plate 5-fixed arm 6A-6D-movable arm 7A-7D-movable mechanism 12, 13-fixed electrode 14-movable diaphragm 15, 16- Insulator 20-input terminal 21N-inverting voltage amplifier 21P-voltage amplifier 22-bias power supply 31A1-hole 31A / 32A-gear 33A-33D-stepping motor 41-operation unit 42-storage unit 43-control unit

Claims (3)

A flat speaker unit that includes a flexible panel-like diaphragm and emits sound in accordance with an input audio signal;
An operation means for receiving an operation of setting the flat speaker unit to a concave curved surface shape, a planar shape, or a convex curved surface shape;
Deformation means for deforming the flat speaker unit into a shape corresponding to a reception operation by the operation means;
A speaker device comprising:   The speaker device according to claim 1, wherein the flat speaker unit is a flat capacitor speaker including a flexible electrode and a diaphragm.   3. The speaker device according to claim 1, wherein the deforming unit includes a fixing unit that fixes a central portion of the capacitor speaker, and a movable unit that pushes and pulls an end portion of the capacitor speaker.

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