JP2012070200A - Panel type sound generation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To integrate an amplifier and an sound generation device, and in addition, to provide a panel type sound generation device that can avoid that the vibration of a vibration plate is transmitted to the amplifier, suppress resonance, and generate sound with superior sound quality.SOLUTION: A panel type sound generation device includes an exciter 2 between a pair of vibration plates 1a and 1b disposed so as to face each other, and in addition, is internally equipped with an amplifier 3 held by vibration control members 4 between the pair of vibration plates 1a and 1b. The thicknesses of the pair of vibration plates 1a and 1b may be not the same at the mutually facing positions.

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sound generator, and more specifically, a panel-type sound generator formed by interposing an exciter that vibrates these diaphragms between a pair of panel-type diaphragms arranged opposite to each other. It is about.

  Conventionally, in a self-supporting sound generator, as shown in FIG. 5, an audio signal input from the outside and converted into a weak current is amplified by an external amplifying unit 6 and sent to the sound generator 7. It is done. The exciter provided in the sound generator 7 is configured to generate vibrations such as voice announcements and background music by applying vibration to the diaphragm of the sound generator 7.

  On the other hand, a panel type speaker system in which the amplifier device of the amplification unit is interposed between a pair of panel type diaphragms has been proposed in recent years as panel type speakers have become thinner.

  For example, Japanese Patent Application Laid-Open No. 2002-27588 includes a pair of flat diaphragms arranged opposite to each other in the front and rear, and one or a plurality of exciters interposed between the diaphragms. Disclosed is a panel type speaker system in which a bobbin portion around which a coil is wound and a magnetic circuit portion having a magnetic gap into which the voice coil is inserted are fixed to a part of the inner surface of each diaphragm. Has been.

  As shown in FIGS. 7 and 8 of Japanese Patent Laid-Open No. 2002-27588, the surface of a pair of flat diaphragms arranged opposite to each other before and after the panel type speaker system has characters, illustrations, and photographs. Etc. can be displayed and various products can be advertised in real time by voice announcements at the same time as visually advertising and guiding the products to customers.

  And because it emits clear audio signals in all directions and can be heard naturally without any discomfort regardless of where it is heard, it can be installed in supermarkets or in stores and used for sales promotion etc. The effect is stated.

JP 2002-27588 A

  However, in the technique described in Patent Document 1, as shown in FIG. 6, since the amplifier device is sandwiched between a pair of flat plate-like diaphragms, the vibration of the diaphragm is directly transmitted to the amplifier device. There has been a problem that problems such as breakage of the connecting portion in the amplifier device and disconnection of the lead wire occur.

  In addition, in a specific frequency range, there is a problem that a pair of diaphragms resonate and howling, and suddenly the volume is increased. The present invention has been made in view of the above-mentioned background art, and its purpose is to integrate the amplifier and the sound generator, prevent the vibration of the diaphragm from being transmitted to the amplifier, and suppress the resonance to provide excellent sound quality. It is providing the panel type | mold sound generator which can generate | occur | produce a sound.

  In order to solve the above problem, in the panel type sound generator according to the first aspect of the present invention, an exciter is provided between a pair of opposed diaphragms, and between the pair of diaphragms. It is characterized in that an amplifier held by a damping member is built in.

  As the vibration plate, a material obtained by sandwiching a core material having a honeycomb or a foamed structure between two film-like or sheet-like surface vibration materials is used. As the surface vibration material, carbon fiber is used. A material having a high hardness and excellent impact resistance obtained by processing a synthetic fiber such as or Kepler or a synthetic resin into a film or sheet is used.

  As the core material, for example, a lightweight metal such as aluminum or glass fiber reinforced plastic (FRP) processed into a honeycomb structure, a lightweight and rigid foam made of a foamed material such as a modified polystyrene foam, or the like is used. Can do. Moreover, what formed these surface layer vibration material and the core material integrally can also be used.

  Further, the diaphragm used in the present invention is not only a diaphragm composed of a surface layer vibration material and a core material, but also a thin curtain diaphragm composed of a wood material, a paper material, a resin-impregnated paper, a metal plate, etc. Synthetic resin thin curtain diaphragms such as polyvinyl chloride resin, polyethylene resin, polypropylene resin, polystyrene resin, and polyester resin can be used.

  As the exciter, an exciter element is usually used. As the above-described exciter element, an element having a known structure including an internal yoke, an external yoke, a permanent magnet, a cancel magnet, a voice coil, and a vibrating body that vibrates back and forth by a driving force generated in the voice coil is used. Sound is generated when vibration is transmitted to the vibration plate from the tip of the vibration member fixed to the plate by adhesion or the like.

  The amplifier includes a control function for selecting, mixing, or amplifying a weak signal current to adjust the level, a power amplifying function for amplifying the controlled signal to obtain driving power, and a general-purpose general-purpose battery incorporating a battery as a power source. A device is used.

  In the panel type sound generator according to the invention described in claim 2 of the present application, in the panel type sound generator according to claim 1, the thicknesses of the pair of diaphragms are made non-identical at the opposing positions. It is a feature.

  The panel-type sound generator according to the third aspect of the present invention is characterized in that in the panel-type sound generator according to the first aspect, the damping member supports the amplifier by point contact.

  The panel type sound generator according to claim 4 of the present application is characterized in that, in the panel type sound generator according to claim 1, the damping member is made of a damping material.

  The vibration damping material is not particularly limited as long as it is a material that absorbs vibration energy. For example, a homogeneous material that absorbs vibration energy, such as foamed resin such as foamed polyurethane and polystyrene, synthetic rubber such as SBR and NBR, natural rubber, or the like is used.

  In the panel-type sound generator according to the first aspect of the present invention, an exciter is provided between a pair of opposed diaphragms, and an amplifier held by a damping member is interposed between the pair of diaphragms. Since the interior is integrated, the manufacturing process can be simplified and labor saving can be achieved. In addition, it is possible to reduce the size and thickness of the apparatus and save space for the installation place. In addition to the self-standing type, a wall-hanging structure or a hanging structure from the ceiling can be provided.

  In addition, since the amplifier is held by the damping member between the pair of diaphragms, vibration transmitted from the diaphragm is suppressed by the damping member, and the amplifier is prevented from vibrating. Therefore, it is possible to generate clear sound over a long period of time by eliminating problems such as damage to parts such as an electronic board constituting the amplifier due to vibration or disconnection of lead wires.

  In the panel type sound generator according to the second aspect of the present invention, the thicknesses of the pair of diaphragms are not the same at the positions facing each other. For example, the thickness is specified by changing the thicknesses at the positions facing each other. The pair of diaphragms are prevented from resonating at a frequency of. As a result, it is possible to prevent a sudden loud sound and howling.

  Furthermore, by making the thicknesses of the diaphragms irregular to each other, it is possible to suppress sound distortion and generate an easily audible sound with a flat frequency characteristic. In addition, it is possible to provide an excellent panel-type sound generator that generates a clear sound with no variation in volume in all directions, is noisy near the speaker, and does not become difficult to hear when separated from the speaker.

  In the panel type sound generator according to the third aspect of the present invention, since the damping member supports the amplifier by point contact, the amplifier contacts the frame with a minimum area and is transmitted from the pair of diaphragms through the frame. Vibration is suppressed to a minimum by the damping member, and the amplifier is prevented from vibrating. In addition, it is possible to eliminate problems such as damage to parts such as an electronic board constituting the amplifier and disconnection of lead wires, and to generate clear sound over a long period of time.

  In the panel-type sound generator according to the invention of claim 4 of the present application, since the damping member is made of a damping material, for example, a damping material such as a foamed polystyrene foam is formed into a substantially U-shaped casing. By filling the lower part of the frame and placing the amplifier in this housing, it is possible to prevent the amplifier from vibrating, eliminate problems such as damage to the parts such as the electronic board that constitutes the amplifier, and disconnection of the lead wire. Sound can be generated over a long period of time.

The longitudinal cross-sectional explanatory drawing which shows the structure of the panel type sound generator which concerns on this invention. Detailed explanatory drawing which shows the part enclosed by (circle) in FIG. Detailed explanatory drawing which shows the state which filled the damping material into the lower frame part of the flame | frame, and hold | maintained the amplifier. The longitudinal cross-sectional explanatory drawing which shows the panel type sound generator of the other structure which concerns on this invention which made the thickness of a pair of diaphragm non-identical in the position which opposes. Explanatory drawing which shows the structure of the conventional self-supporting sound generator.

  Hereinafter, embodiments of a panel-type sound generator according to the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a longitudinal cross-sectional explanatory view showing a configuration of a panel type sound generator A according to the present invention. FIG. 2 is a detailed explanatory view showing a portion surrounded by a circle in FIG.

  As shown in FIG. 1, in the panel type sound generator A, an exciter 2 is provided between a diaphragm 1a and a diaphragm 1b arranged opposite to each other in the front-rear direction, and the pair of diaphragms An amplifier 3 is supported by a damping member 4 between 1a and the diaphragm 1b.

  As shown in FIG. 2, the specific internal structure of the amplifier 3 is such that the diaphragm 1a and the diaphragm are formed in the groove 51 of the frame 5 in which a groove 51 having a substantially U-shaped cross section is formed on the top surface. 1b is firmly fitted opposite to each other, and the sound generator is integrated with the amplifier 3 supported by the damping member 4 in the frame 5. More specifically, as shown in the figure, a damping member 4, for example, a triangular pyramid shape (or a truncated cone shape) is formed on the lower frame portion of the frame 5 that holds the four sides of the diaphragm 1a and the diaphragm 1b. The amplifier 3 is held by point contact from below and from the left and right through the foamed polyurethane foam.

  As described above, the amplifier 3 is held in point contact (or close to point contact) by the plurality of damping members 4 so that the amplifier 3 contacts the frame 5 through the damping member 4 with a minimum area. The vibration transmitted from the diaphragm 1a and the diaphragm 1b through the frame 5 is suppressed by the damping member 4, and the amplifier 3 is prevented from vibrating. In addition, it is possible to eliminate problems such as damage to components such as an electronic board constituting the amplifier 3 and disconnection of lead wires, and to generate clear sound over a long period of time.

  FIG. 3 is a detailed explanatory view showing a state where the damping material 41 itself constituting the damping member 4 in FIG. 2 is filled in the lower frame portion of the frame 5 and the amplifier 3 is held. As shown in FIG. 3, for example, a foamed polyurethane foam itself is molded into a substantially U-shaped casing and filled in the lower frame portion of the frame 5, and the amplifier 3 is accommodated in the casing.

  By doing so, the amplifier 3 comes into contact with the frame 5 through the damping material 41, and vibrations transmitted from the diaphragm 1a and the diaphragm 1b through the frame 5 are suppressed by the damping material 41. Prevent vibration. In addition, it is possible to eliminate problems such as damage to components such as an electronic board constituting the amplifier 3 and disconnection of lead wires, and to generate clear sound over a long period of time.

  Further, as described above, the amplifier 3 is held by point contact from the lower side and the left and right directions through the foamed polyurethane foam formed in a triangular pyramid shape, and vibration suppression of bead-like foamed polystyrene or the like is provided in the gap that is not point contact Material 41 may be filled. By doing so, vibration transmitted from the diaphragm 1a and the diaphragm 1b through the frame 5 is more effectively absorbed, preventing damage to parts such as an electronic board constituting the amplifier 3 and disconnection of lead wires. And clear sound can be generated for a long time.

  In the above embodiment, the amplifier 3 is housed in the frame 5 provided at the lower ends of the diaphragm 1a and the diaphragm 1b. However, the amplifier 3 is arranged in accordance with the material and configuration of the diaphragm 1a and the diaphragm 1b. It is also possible to directly decorate between 1a and diaphragm 1b. Therefore, in the present specification, the amplifier 3 provided in the frame 5 has the same meaning as the amplifier 3 provided between the diaphragm 1a and the diaphragm 1b.

  FIG. 4 is a longitudinal cross-sectional explanatory view showing a panel-type sound generator B having another configuration according to the present invention in which the thicknesses of the diaphragm 1a and the diaphragm 1b are not identical at the opposing positions. As shown in FIG. 4, it is possible to prevent the diaphragm 1a and the diaphragm 1b from resonating at a specific frequency and suddenly generating a loud sound by changing the thicknesses of the two at opposite positions.

  In addition to changing the thickness, the shapes of the diaphragm 1a and the diaphragm 1b may be changed. For example, the diaphragm 1a may be a panel having a uniform thickness, and the inside of the diaphragm 1b may be shaped like a convex lens. Alternatively, both may have a shape in which the inner side is expanded into a convex lens shape. In this way, by making the thicknesses of the diaphragm 1a and the diaphragm 1b non-identical at opposite positions, resonance can be prevented and the sound quality generated from the diaphragm 1a and the diaphragm 1b can be made clear.

  In the drawings, the inner side surfaces of the diaphragm 1a and the diaphragm 1b are expressed in a straight line, but in reality, they are formed in a curved surface or an uneven shape. In this case, it is preferable in terms of appearance to form the inner side surface of the diaphragm 1a or the diaphragm 1b, not the outer side surface, in a curved shape or an uneven shape.

  As described above, the panel-type sound generator according to the present invention can be designed and changed, and all cases belong to the technical scope of the present invention unless departing from the scope of the claims.

A Panel-type sound generator B according to the present invention B Panel-type sound generator 1a having another configuration according to the present invention Diaphragm 1b Diaphragm 2 Exciter 3 Amplifier 4 Damping member 41 Damping material
5 Frame 51 Groove 6 Amplification unit 7 in the prior art Sound generator in the prior art

Claims (4)

  A panel-type sound generator in which an exciter is provided between a pair of diaphragms arranged opposite to each other, and an amplifier held by a damping member is provided between the pair of diaphragms.   The panel-type sound generator according to claim 1, wherein the thicknesses of the pair of diaphragms are not the same at opposing positions.   The panel type sound generator according to claim 1, wherein the damping member supports the amplifier by point contact.   The panel-type sound generator according to claim 1, wherein the damping member is made of a damping material.

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