JP2015130624A - Vibration generator and acoustic device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technique capable of arranging various resonators.SOLUTION: A resonator 20 is arranged on a housing 14 and an exciter 11 is fixed to the housing 14. An acoustic device includes: the housing 14 having an arrangement surface to arrange the resonator 20 thereon;a vibration generator having the exciter 11 fixed to the housing 14 and a vibration shaft 12 to be vibrated by the exciter 11; and the resonator 20 to be arranged on the arrangement surface. A resonator recognition section 102 discriminates whether the resonator 20 is arranged on the housing 14 or not via a sensor 101. A sound content selection section 103 selects sound data from a sound content storage section 104, and inputs the data to a sound signal reproduction section 105. The sound signal reproduction section 105 reproduces the sound contents and outputs them. A sound signal amplification section 106 amplifies the electric signal and inputs the signal to the exciter 11. The exciter 11 vibrates the vibration shaft 12 on the basis of the input electric signal.

Description

  The present invention relates to a vibration generator used in an acoustic device.

  In recent years, exciters have been reduced in size and thickness, and are used in the form of being mounted inside a speaker device having a diaphragm. Such an acoustic device has been completed as a speaker incorporating an exciter and has a structure in which the exciter comes into contact with the diaphragm, so that even a single unit can emit sound.

JP-A-11-331966

  Patent Document 1 is a panel-type speaker including an exciter including a magnetic circuit and a voice coil, and a flat diaphragm (resonator) whose central portion is coupled to the exciter, and the exciter is the diaphragm By embedding in the inside, it is possible to reduce the thickness and use both front and back. However, since the exciter is embedded in the diaphragm, the resonator cannot be changed, and an equalizer or the like has to be used to change the sound quality.

  Therefore, the present invention provides a technique capable of arranging various resonators.

  In order to solve the above-described problems of the related art, the present invention includes a casing having an arrangement surface for arranging a resonator, an exciter fixed to the casing, and a vibration axis vibrated by the exciter. The vibration generator is characterized in that at least a part of the arrangement surface is a flat surface, and an upper end of the vibration axis is exposed to the arrangement surface in the flat surface.

  According to the present invention, various resonators can be arranged.

It is a block diagram which shows the example which applied the vibration generator 1 to the sound reproduction apparatus. 2 is an enlarged cross-sectional view of the vibration generator 1. FIG. It is a block diagram which shows another example which applied the vibration generator 1 to the sound reproduction apparatus. 4 is a diagram for explaining an example of a resonator 20. FIG. 4 is a diagram for explaining an example of a resonator 20. FIG. 4 is a diagram for explaining an example of a plurality of resonators 20. FIG. 4 is a diagram for explaining an example of a plurality of resonators 20. FIG. 3 is a cross-sectional view of a housing 14 in which a cap 15 is installed on a vibration shaft 12. FIG.

  Hereinafter, the vibration generator 1 of this invention is demonstrated with reference to drawings. In the drawings, the same components are denoted by the same reference numerals.

FIG. 1 is a configuration diagram illustrating an example in which the vibration generating device 1 is applied to a sound reproducing device.
The vibration generator 1 includes an exciter 11 fixed to a housing 14 using a bracket 13 or the like, and a vibration shaft 12 that propagates the acoustic vibration.
The exciter 11 is fixed to the housing 14 using a bracket 13 or the like.
The vibration shaft 12 is disposed so as not to contact the housing 14. The casing 14 and the vibration shaft 12 may be connected via a material (vibration control member) that is difficult to transmit vibration, such as an elastic body.
The upper surface of the housing when the projecting direction of the vibration shaft 12 is upward is a flat surface as shown in FIGS. This plane is referred to as a placement surface. The upper end of the vibration shaft 12 is exposed on this arrangement surface. The arrangement surface is preferably a flat surface in a region including at least the periphery where the vibration axis protrudes.
The tip of the vibration shaft 12 may protrude from a peripheral portion where the vibration shaft protrudes on the arrangement surface of the housing 14 or may be on the same plane as the peripheral portion. This arrangement surface plays a role of arranging a resonator 20 described later. Therefore, when the resonator 20 is a polyhedron, it is preferable that the resonator 20 is a flat surface in a region having an area larger than the area of at least one surface.
The audio content selection unit 103 selects audio content data to be reproduced from the audio content storage unit 104 and inputs the selected audio content data to the audio signal reproduction unit 105. Here, the audio content storage unit 104 is, for example, an HDD, a flash memory, an optical disk, or the like. The audio content storage unit 104 may be built in the sound reproduction device or may be outside the sound reproduction device. In a configuration in which the audio content storage unit 104 is external to the sound reproduction device, the sound reproduction device may communicate with the audio content storage unit 104 via a cable or a network.
The audio signal reproduction unit 105 reproduces audio content and outputs an electrical signal (audio signal) based on the audio content. The audio signal amplification unit 106 amplifies the electric signal and inputs it to the exciter 11. The exciter 11 vibrates the vibration shaft 12 based on the input electric signal.

  Here, the exciter 11 employed as the vibration element in the present embodiment will be described with reference to FIG. FIG. 2 shows an example using a giant magnetostrictive element. As shown in FIG. 2, the exciter 11 is configured, for example, by winding an electric coil (not shown) around a giant magnetostrictive element. When an electric signal flows through the electric coil, the giant magnetostrictive element expands and contracts. When a giant magnetostrictive element is used, the giant magnetostrictive element becomes the vibration axis 12. The vibration shaft 12 may protrude from the arrangement surface or may be on the same plane as the arrangement surface. Moreover, it can be said that what is vibrated primarily (first) by the electric coil becomes the vibration shaft 12.

In this state, when nothing is placed on the housing 14, there is no object that is resonantly vibrated by the vibration shaft 12, so no sound is basically generated even if the vibration shaft 12 vibrates. Note that the housing 14 and the vibration shaft 12 may be in contact with each other to some extent as long as a change in sound can be recognized when a resonator described later is disposed. In that case, since the housing 14 is vibrated, a sound is emitted. However, if a resonator is provided, the sound becomes louder. Moreover, if a resonator is arranged, the sound quality can be changed. However, it is more preferable to prevent the housing 14 and the vibration shaft 12 from coming into contact with each other or to connect the vibration shaft 12 via a vibration damping member, since the change in volume when the resonator is disposed becomes large.
On the other hand, when the resonator 20 is placed on the arrangement surface so as to be in contact with the vibration shaft 12 while the vibration shaft 12 is vibrating, the vibration of the vibration shaft 12 propagates to the resonator 20 and is reproduced through the audio signal reproduction unit 105. Audio based on the audio content thus produced is generated as an audible sound through the resonator 20. Here, the resonator 20 is preferably an object made of a material having a relatively large elastic modulus, such as a wooden block, wood, metal, or plastic.

  As described above, even when the audio content is constantly reproduced and the vibration shaft 12 vibrates, when the resonator 20 is placed on the vibration shaft 12, sound can be heard and the resonator 20 can be placed on the vibration shaft 12. If it is removed from the sound, the sound becomes inaudible or becomes smaller.

  In addition to the above, FIG. 1 shows whether or not the resonator 20 is arranged on the casing by the resonator recognition unit 102 through the sensor 101 and the resonator 20 is arranged. The exciter 11 is configured to vibrate the vibration shaft 12. And when the resonator 20 is not arrange | positioned on a housing | casing, the vibration of the vibration axis 12 by the exciter 11 is stopped. These controls are performed by a vibration control unit (not shown). When stopping the vibration of the vibration shaft 12, for example, an electrical signal may not be output from the audio signal amplification unit 106.

  If the configuration of FIG. 1 is used, energy can be saved. This is particularly effective when the number of exciters 11 mounted on the housing 14 is increased. As the sensor 101 here, an infrared sensor that detects the presence of an object in a non-contact manner, an acceleration sensor that detects a change in weight when the resonator is placed on the housing, a simple convex switch, or the like can be used. .

  FIG. 3 shows an attribute that is arbitrarily defined for the resonator 20 placed on the housing 14 by the resonator identifying unit 107 via the sensor 101, and based on the obtained attribute information, the audio content selecting unit 103 is identified. Selects the audio content corresponding to the attribute of the resonator 20 from the audio content storage unit 104, and the resonator 20 through the audio signal reproduction unit 105, the audio signal amplification unit 106, the exciter 11, and the vibration shaft 12. It is a block diagram which carries out sound reproduction. As attributes of the resonator, various parameters such as the shape, material, and weight of the resonator can be defined alone or in combination. For example, when the shape, color, material, weight, etc. of the resonator changes, the audio content selection unit 103 changes the audio content. In order to detect changes in the shape, color, material, weight and the like of the resonator, the sensor 101 here may use an imaging device.

  FIG. 4 shows an example of the resonator 20. As shown in FIG. 4, the resonator 20 </ b> A is a figurine that has an animal shape and is hollow inside. Or, it is an application that selects and reproduces audio content related to the animal.

  FIG. 5 shows an example of another resonator 20. As shown in FIG. 5, a QR code that encodes composite information is attached to the resonator 20B, which is a wooden block, and this information is read by the QR code sensor 101B, and then the audio content based on the information is read. Fine control such as selection and reproduction can be performed.

  For example, URL information of a server on the Internet is encoded in a QR code, audio content is selected on the Internet server side according to the context at that time, and the resonator 20B is generated using the configuration of FIG. Detailed service can be realized. Although a QR code is used in the present embodiment, the same effect can be obtained by using other means such as attaching an IC tag to the resonator.

Next, an embodiment having a plurality of resonators will be described with reference to FIG.
As shown in FIG. 6, in a state where the vibration shaft 12 is vibrating, the resonators 20C and 20G are placed on the vibration shaft 12 so as to be in contact with each other, and the resonators 20D, 20E, and 20F are placed on the resonator 20C. And the resonators 20H and 20I are stacked on the resonator 20G. By doing so, sound is output from each of the resonators 20C, 20D, 20E, and 20F. Therefore, various changes appear depending on the volume and sound quality, and the spread of the sound image can be obtained. Various sound quality changes can be obtained by using a plurality of resonators having different shapes.

  For example, as described above with reference to FIG. 3, when the soft material resonator 20 is touched, the audio content selection unit 103 selects audio content of a genre such as easy listening from the audio content storage unit 104. When the resonator 20 made of a hard material comes into contact, the audio content can be selected from the audio content storage unit 104 by the audio content selection unit 103.

Another example of the resonator will be described with reference to FIG.
As shown in FIG. 7, in the state where the vibration shaft 12 is oscillating, the resonators 20J, 20K, and 20L are placed on the vibration shafts 12 so as to be in contact with each other. Sound is output. As described above with reference to FIG. 1, the resonator recognition unit 102 determines whether or not the resonators 20J, 20K, and 20L are on the casing, and the resonators 20J, 20K, and 20L are determined. The sound can be output when any of the resonators 20J, 20K, and 20L is placed. Further, since the resonators 20J, 20K, and 20L shown in FIG. 7 are wine glasses, the volume and sound quality can be changed depending on the amount of liquid in the wine glasses.

  Next, as another embodiment, an embodiment in which a cap 15 is installed on the vibration shaft 12 will be described with reference to FIG. Except for the cap 15 in FIG. 8, the configuration is basically the same as that of the above-described invention. Therefore, description of the same configuration is omitted.

  The audio signal amplifier 106 amplifies the electric signal and inputs it to the exciter 11. The cap 15 is attached so as to cover the vibration shaft 12 that vibrates based on the electric signal input to the exciter 11.

  When there is no object that is resonantly vibrated by the vibration shaft 12, no sound is produced even if the vibration shaft 12 vibrates, but when the cap 15 is attached while the vibration shaft 12 is vibrating, the vibration of the vibration shaft 12 is reduced. Audio based on the audio content that has been propagated to the cap 15 and reproduced through the audio signal reproduction unit 105 is output through the cap 15.

By placing the resonator 20M on the arrangement surface so as to contact the cap 15, sound is output from the resonator 20M, and the volume and sound quality can be changed.
Since the upper surface of the cap 15 has a certain contact area with the resonator 20M, the resonator 20M can be placed stably. As shown in FIG. 8, the upper surface of the cap 15 is flush with the arrangement of the housing 14, but is not limited to this. The upper surface of the cap 15 may protrude from the arrangement surface of the housing 14.
If the cap 15 is made larger than the resonator M, the position of the upper surface of the cap 15 may be recessed from the arrangement surface of the housing 14.
Even when a part of the resonator 20 </ b> M is protruded, the position of the upper surface of the cap 15 may be recessed from the arrangement surface of the housing 14.

Further, the upper surface exposed on the arrangement surface of the vibration axis may be sized as the cap 15 in FIG. By doing so, the resonator 20 can be stably brought into contact with only the vibration shaft 12 without the cap 15.
If the upper surface of the vibration axis is made larger than the resonator M, the position of the upper surface of the cap 15 may be recessed from the arrangement surface of the housing 14.
Even when a part of the resonator 20 </ b> M is protruded, the position of the upper surface of the vibration axis may be recessed from the arrangement surface of the housing 14.

  As described above, the vibration generator 1 of the present embodiment can arrange various resonators.

  This embodiment mentioned above is an illustration for description, and is not limited to the said embodiment. The present invention may be configured such that a shelf, a table, or the like is used as the arrangement surface. It can also be applied to walls and floors.

  The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the gist of the present invention. For example, you may combine each embodiment, a modification, etc.

DESCRIPTION OF SYMBOLS 11 Exciter 12 Vibration axis 13 Bracket 14 Case 15 Cap 20 Resonator 101 Sensor 101A Image sensor 101B QR code sensor 102 Resonator recognition unit 103 Audio content selection unit 104 Audio content storage unit 105 Audio signal reproduction unit 106 Audio signal amplification unit 107 Resonator identification unit

Claims (5)

A housing having an arrangement surface for arranging the resonator;
An exciter fixed to the housing;
A vibration shaft vibrated by the exciter,
At least a part of the arrangement surface is a plane,
The upper end of the vibration axis is exposed to the arrangement surface in the plane.
A vibration generator characterized by that. The upper end of the vibration axis is on the same plane as the plane, or protrudes from the plane,
The vibration generator according to claim 1. A resonator recognition unit that determines whether or not the resonator is arranged on the arrangement surface;
With
The exciter vibrates the vibration shaft when the resonator recognition unit determines that the resonator is disposed on the placement surface.
The vibration generator according to claim 1 or 2, wherein The vibration generator according to any one of claims 1 to 3,
An acoustic device comprising: a resonator disposed on the placement surface.   The acoustic device according to claim 4, comprising a plurality of resonators.