JP2008167135A - Sound generating device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve sound generation efficiency from a sound vibration outputting body in a sound generating device provided with a structure different from an electroacoustic transducing element of a speaker as a sound vibration outputting body. <P>SOLUTION: One end side of a vibration shaft 5 is connected to an output side of a vibration generating part 3, and the other end side reaches up to a part closer to an opening of an air gap 35 in a decorative holder 29. Sound vibrations from the vibration generating part 3 are surely transmitted to a universal joint 11 for sound generation leaf through the vibration shaft 5 and a universal joint fixed cap 9 for sound generation leaf while horizontal backlashing is prevented by O rings 31 and 33 for holding the vibration shaft provided in a gap defined by the vibration shaft 5 and a column part of the casing 1. The sound vibrations transferred from the vibration generating part 3 to the vibration shaft 5 are also surely transmitted from a pedestal 7 to universal joints 13, 15 and 41 for sound generation leaf. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an acoustic generator that converts an electrical signal from a sound source into acoustic vibration and outputs the acoustic vibration.

  Conventionally, a surround type speaker system has been proposed for the purpose of effectively using a flower pot for relieving stress and greening a room. In the speaker system according to the proposal, a pair of legs and a sound emitting portion are formed on the lower surface of the speaker box in which the speaker unit is mounted, and the top plate of the speaker box and the bottom of the flower pot are in close contact with each other. It is the united structure (for example, refer patent document 1).

  In addition, proposals have been made for the purpose of providing a bass reflex type speaker box having a speaker unit that is small in size and excellent in low-frequency characteristics and has an excellent shape as an interior decoration. The speaker box according to the proposal has a configuration in which a box main body and a duct extending upward from the outside are integrally formed by an outer shell having a smooth curve (see, for example, Patent Document 2).

  Furthermore, a sound generator for the purpose of generating sound such as music and voice from flowers and trees has been proposed. In the sound generation device according to the proposal, the coil portion is vibrated by an electric signal output from the sound source device through the output terminal, and sound is generated from a rod-like sound generation member such as a flower or a tree inserted in the coil portion. It has such a configuration (see, for example, Patent Document 3).

Microfilm of Japanese Utility Model Application No. 4-93439 (Japanese Utility Model Application Publication No. 6-54388) Microfilm of Japanese Utility Model No. 60-85635 (Japanese Utility Model Application No. 61-202990) Japanese Patent No. 3353008

  By the way, among the above-described proposals, the technique disclosed in the proposal cited as Patent Document 1 and the technique disclosed in the proposal cited as Patent Document 2 can each achieve the intended purpose. However, it does not essentially generate sound from plants such as flowers and plants. In reality, in the devices (speaker system and speaker box) according to these two proposals, although the output signal from the sound source is converted into sound in the speaker and the sound is emitted from the speaker, the sound is the same as above. It is only configured to be emitted from plants. In addition to the above, the techniques disclosed in the above two proposals also have a problem that a sufficiently high volume and high quality sound cannot be obtained.

  In view of such circumstances, the technology related to the proposal cited as Patent Document 3 has been proposed.

  However, even though the technique disclosed in this proposal can achieve the intended purpose, there are restrictions on the installation conditions of the apparatus. May not be installed. In addition, in the technique according to the proposal, a specific method for securely attaching a rod-shaped member such as a flower, a tree, or a creation as an acoustic generation member to the coil portion is not disclosed. It is difficult to securely attach to the coil part. Further, in the technology according to the proposal, sound is generated not only from the sound generating member but also from the sound generating device main body, and the sound is (a plant such as a flower or a tree, a structure imitating these) There is also a problem that it is louder than the sound generated from the sound generating member (such as an object or other artificial structure). Further, in the technology according to the proposal, when comparing the sound generated from the sound generation member, the sound volume and sound quality of the sound generated from the sound generator main body, and the sound volume and sound quality of the sound output from a normal speaker, There is also a problem that the sound generated from the sound generation member or the sound generator main body has a lower volume and lower sound quality than the sound output from a normal speaker.

  Furthermore, as a result of experiments conducted by the present inventor, it has been found that a so-called artificial flower produced in the past is not suitable as a structure (structure) for generating sound. Yes.

  Accordingly, it is an object of the present invention to improve the efficiency of sound generation from an acoustic vibration output body in a sound generation apparatus provided with a structure different from the electrical / acoustic conversion element of the speaker as an acoustic vibration output body. There is.

  Another object of the present invention is to use an artificial structure similar to a plant such as a flower or a tree or an artificial structure dissimilar to a plant such as a flower or a tree as the acoustic vibration output body. An object of the present invention is to provide a sound generator capable of generating sound.

  Still another object of the present invention is to enable a speaker capable of outputting high-quality sound and having a wide reproduction band of low-frequency sound to be set at a substantially central part of a houseplant. At the same time, the sound from the speaker can be recognized as the sound from the foliage plant.

  The sound generator according to the first aspect of the present invention includes an electric signal / acoustic vibration conversion unit that converts an electric signal from a sound source into an acoustic vibration, and a rigid body that extends substantially linearly, and the one end side is An acoustic vibration transmitting member connected to the electric signal / acoustic vibration converting unit and transmitting the acoustic vibration from the electric signal / acoustic vibration converting unit transmitted from one end side to the other end side, and a flexible wire A joint for guiding acoustic vibration from the acoustic vibration transmission member to the other end side, which includes a ring-shaped elastic material as a component and is detachably attached to a portion near the other end of the acoustic vibration transmission member. And an acoustic vibration output body which is formed by imitating a shape of a specific part of a plant, which is curved with a predetermined curvature and is detachably held on the other end of the joint member, through the joint member Audible sound transmitted acoustic vibration And an acoustic vibration output member for outputting a predetermined orientation with.

  In a preferred embodiment according to the first aspect of the present invention, the joint member is detachably attached to the other end side of the acoustic vibration transmission member via a fixture.

  In an embodiment different from the above, the linear elastic material having flexibility is a bamboo string, and the joint member includes a bundle of a plurality of bamboo strings, and a heat-shrinkable tube surrounding the bundle. And a fixing member for fixing the bundle of bamboo straws.

  In another embodiment different from the above, the predetermined curvature is set to about 0.64 times the axial length of the acoustic vibration output body.

  In an embodiment different from the above, the acoustic vibration output body is created by imitating a flower or a plant.

  In an embodiment different from the above, a plurality of the acoustic vibration output bodies and the joint members are provided, and the respective acoustic vibration output bodies are in a positional relationship such that they do not contact each other. It is held by different joint members.

  In an embodiment different from the above, one or more dummy acoustic vibration output bodies having substantially the same shape as the acoustic vibration output body are further provided.

  Furthermore, in an embodiment different from the above, the one or more dummy acoustic vibration output bodies are respectively positioned from the acoustic vibration transmission member in such a positional relationship that they do not contact the acoustic vibration output body. It is held by different joint members that are supported by a structure to which no acoustic vibrations are transmitted.

  A speaker system according to a second aspect of the present invention includes a housing, a first acoustic tube having one end open to the outside and the other end communicating with the internal space of the housing, and a speaker unit provided in the internal space of the housing. A first cabinet that is disposed in the internal space so that the cone surface faces a portion facing the other end of the first acoustic tube, and the internal space is open to the outside; A speaker unit partitioned into a second cabinet isolated in a sealed state; and a second acoustic tube slidably provided in a portion extending from the inside of the first acoustic tube to the internal space of the first cabinet. The end on the side facing the cone surface is positioned at an arbitrary position apart from the position where the cone surface does not contact the reference position. Comprising a second acoustic pipe to be fixed, the.

  In a preferred embodiment according to the second aspect of the present invention, even if the cone surface vibrates due to an electrical signal output from a sound source to the speaker unit, the reference position of the second acoustic tube is An end is a position which does not contact the cone surface.

  In an embodiment different from the above, one or a plurality of acoustic ports are provided on the side opened to the outside of the first acoustic tube.

  In an embodiment different from the above, the number and size of the acoustic ports are set in a range that does not significantly affect the Helmholtz resonance frequency characteristics in the speaker system.

  According to the present invention, it is possible to improve the efficiency of sound generation from an acoustic vibration output body in a sound generation apparatus provided with a structure different from the electrical / acoustic conversion element of the speaker as an acoustic vibration output body. Is possible.

  In addition, according to the present invention, as an acoustic vibration output body, sound is generated using an artificial structure similar to plants such as flowers and trees, or an artificial structure dissimilar to plants such as flowers and trees. An acoustic generator that can be generated can be provided.

  Furthermore, according to the present invention, a speaker capable of outputting high-quality sound and having a wide reproduction band of low-frequency sound can be set at a substantially central part of a foliage plant. Thus, the sound from the speaker can be recognized as the sound from the foliage plant.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a diagram illustrating an overall configuration of a vibration device included in a sound generation device according to an embodiment of the present invention. In FIG. 1, FIG. 1A is a view of the vibration device as viewed from above, and FIG. 1B is a view of the vibration device when cut along the line AA ′ of FIG. It is the figure which showed the cross-section.

  As shown in FIGS. 1A and 1B, the vibration device includes a casing 1, a vibration generating unit 3, a vibration shaft 5, a pedestal 7, a sound generating universal joint fixing cap 9, and the like. , A plurality of universal joints for sound generating leaves 11, 13, 15, 41, a plurality of universal joints for dummy (decorative leaves) 17, 19, 37, and a decoration holder 29. In addition to the above-mentioned parts, the vibration device further includes a plurality of sound generating leaf universal joint fixing screws 21, 23, 43, a plurality of dummy (decorative leaf) universal joint fixing screws 25, 27, 39, and a plurality of The vibration shaft holding O-rings 31 and 33 are also provided.

  As shown in FIG. 1 (a), the vibration device has a generally circular shape as viewed from above, and a decorative holder 29 having a substantially annular shape on the outermost periphery is circular on the inner peripheral side. The pedestal 7 having a substantially annular shape with the annular gap 35 therebetween is arranged concentrically. Dummy (decorative leaf) universal joints 17, 19, 37 are arranged at substantially equal intervals on the inner peripheral surface of the decoration holder 29. These are fixedly mounted by dummy (decorative leaf) universal joint fixing screws 25, 27, and 39, respectively.

  The sound generating leaf universal joints 13, 15, 41 are arranged at substantially equal intervals on the outer peripheral surface of the pedestal 7, and each of the sound generating leaf universal joints 13, 15, 41 is freely used for the sound generating leaf. The joint fixing screws 21, 23 and 43 are attached and fixed. A vibration shaft 5 is fitted into the center of the base 7, and a sound generating universal joint fixing cap 9 is attached to the upper end portion of the vibration shaft 5. The sound generating leaf universal joint 11 (described in FIG. 1B) is linked to the vibration shaft 5 via a sound generating universal joint fixing cap 9.

  As shown in FIG. 1 (b), the casing 1 has a substantially inverted T-shaped side cross section, and a vibration generating portion having, for example, a cylindrical shape is provided at the substantially center of the bottom of the casing 1 extending in the lateral direction. 3 is arranged. On the other hand, a decoration holder 29 is fitted in the vicinity of the upper end of the column portion extending in the longitudinal direction of the casing 1. The decoration holder 29 has a gap 35 that is fully open at an upper portion that is cut out concentrically with the decoration holder 29 so that the side section thereof is substantially concave.

  One end side of the vibration shaft 5 is connected to the output side of the vibration generating unit 3, and the other end side reaches a portion near the opening of the gap 35 in the decoration holder 29. The vibration shaft 5 is a vibration generating portion in a state in which the backlash in the lateral direction is prevented by the vibration shaft holding O-rings 31 and 33 interposed in the gap defined by the vibration shaft 5 and the column portion of the casing 1. 3 is held so as to be reliably transmitted to the sound generating leaf universal joint 11 through the vibration shaft 5 and the sound generating universal joint fixing cap 9. The acoustic vibration transmitted from the vibration generating unit 3 to the vibration shaft 5 is further reliably transmitted from the pedestal 7 to the sound generating leaf universal joints 13, 15, 41.

  In the present embodiment, the vibration shaft holding O-ring 31 is interposed in a portion near the upper end of the column portion, and the vibration shaft holding O-ring 33 is interposed in a portion near the lower end of the column portion. The lower portion of the sound generating universal joint fixing cap 9 is attached to the upper end portion of the vibration shaft 5, and the upper portion of the sound generating universal joint fixing cap 9 is the lower end of the sound generating leaf universal joint 11. It is attached to the close part.

  The pedestal 7 has a substantially cylindrical shape, and the vibration shaft 5 is fitted and inserted at the approximate center thereof. The pedestal 7 is positioned at a position near the bottom of the gap 35 and is fixedly attached to the vibration shaft 5 by a pedestal fixing screw 44. As described in FIG. 1A, a plurality of sound generating leaf universal joints 13 and 15 (41) are arranged on the outer peripheral surface of the pedestal 7 at substantially equal intervals. The universal joints 13 and 15 (41) are fixedly mounted by means of the universal joint fixing screws 21 and 23 (43) for sound generating leaves.

  As described in FIG. 1 (a), a plurality of dummy (decorative leaf) universal joints 17 and 19 (37) are arranged at substantially equal intervals on the inner peripheral surface of the decoration holder 29. The dummy (decorative leaf) universal joints 17, 19 (, 37) are fixedly attached by dummy (decorative leaf) universal joint fixing screws 25, 27 (, 39), respectively. The lower ends of the dummy (decorative leaf) universal joints 17, 19 (, 37) are attached and fixed in a state where they are immersed in the bottom of the gap 35, that is, the ornamental holder 29.

  FIG. 2 is a diagram illustrating each part of the vibration transmission system in the vibration device illustrated in FIG. 1. 2A is a view of the vibration transmission system as viewed from above, and FIG. 2B is the vibration transmission when cut along the line BB ′ in FIG. 2A. It is the figure which showed the cross-section of the system | strain.

  In the present embodiment, the vibration transmission system includes the vibration shaft 5, the pedestal 7, and the plurality of sound generating leaf universal joints 11, 13, 15 (41). As described in detail in FIG. 1, the vibration shaft 5 has one end connected to the output side of the vibration generating unit 3, and a pedestal 7 at a portion near the other end, and a substantially central portion thereof. In the inserted state, it is attached and fixed by a screw 44 for fixing the base.

  FIG. 3 is a diagram showing the casing 1, the vibration generating unit 3, and the vibration shaft 5 that constitute the vibration device illustrated in FIG. 1. 3, FIG. 3 (a) is a view of the casing 1, the vibration generating section 3, and the vibration shaft 5 as viewed from above, and FIG. 3 (b) is a CC ′ line in FIG. 3 (a). It is the figure which showed the cross-sectional structure of the casing 1, the vibration generation part 3, and the vibration shaft 5 when cut | disconnected by.

  As described in FIG. 1, the contour of the bottom of the casing 1 as viewed from above, the contour of the column portion of the casing 1 as viewed from above, and the contour of the vibration shaft 5 as viewed from above are all substantially circular. The bottom part of the casing 1, the support | pillar part of the casing 1, and the vibration axis | shaft 5 are arrange | positioned concentrically.

  The vibration generating unit 3 corresponds to the core portion of the speaker, and includes, for example, a ring-shaped magnet that is a stator and a voice coil that is a vibrator (movable element). The vibration generating unit 3 converts an acoustic signal (electric signal) transmitted from a sound source (not shown) through a pair of signal cables (not shown) into sound (vibration) using a voice coil.

  The vibration shaft 5 is made of, for example, a rigid body, and its base end side is attached and fixed to the upper surface of the voice coil described above. The members indicated by reference numerals 31 and 33 are vibration axis holding O-rings.

  FIG. 4 is a diagram showing the structure of the universal joints 11, 13, 15, 41 for dummy generating leaves and the universal joints 17, 19, 37 for dummy (decorative leaves) shown in FIG. 1 and FIG. 4, FIG. 4 (a) is a view of the sound generating leaf universal joints 11, 13, 15, and 41 and the dummy (decorative leaf) universal joints 17, 19, and 37 as viewed from above. (B) is a perspective view of the universal joints 11, 13, 15, 41 for sound generating leaves and the universal joints 17, 19, 37 for dummy (decorative leaves) in a state where a part of the internal structure is exposed. Further, FIG. 4C is a perspective view of the sound generating leaf universal joints 11, 13, 15, 41 and the dummy (decorative leaf) universal joints 17, 19, 37 with the entire internal structure exposed. It is.

  As shown in FIG. 4, the universal joints 11, 13, 15, 41 for the sound generating leaves and the universal joints 17, 19, 37 for the dummy (decorative leaves) are a plurality of (for example, about 5) long and narrow bamboo 45. , 47, 49, 51, 53, a heat shrinkable tube 55, and a fixing cap 57. Bamboo bars 45, 47, 49, 51 and 53 are employed as skeleton members (of the universal joint for sound generating leaves and the universal joint for dummy (decorative leaf)), as shown in FIG. 4 (b). Each of them is a long member extending linearly, and they are bundled in close contact with each other in order not to reduce the transmission efficiency of acoustic vibration. The reason for using elongated bamboo materials for the bamboo strings 45, 47, 49, 51, and 53 is that it is not only relatively easy to be in a bent state (curved state), but also because it is elongated, This is because the transmission efficiency of acoustic vibration from one end side to the other end side of 45, 47, 49, 51, 53) is relatively high.

  As shown in FIG. 4 (c), to fix the bundle of bamboo strings 45, 47, 49, 51, 53 to one end side of the bamboo strings 45, 47, 49, 51, 53 bundled in one bundle. The fixing cap 57 is covered. The fixing cap 57 is bonded and fixed to one end side of the bundle of the bamboo straws 45, 47, 49, 51, 53 with, for example, a commercially available adhesive. Further, the outer periphery of the bamboo bunches 45, 47, 49, 51, 53 bundled in one bundle is the other end (open end) excluding the one end side portion where the fixing cap 57 is covered. The entire remaining portion reaching the side portion is surrounded by the heat-shrinkable tube 55 in the manner shown in FIG. The universal joints described above (including the universal joints for sound generating leaves (11, 13, 15, 41) as well as the universal joints for dummy (decorative leaves) (17, 19, 37) are linear. The transmission efficiency of the acoustic vibration is the highest in the state of extending to, and the transmission efficiency of the acoustic vibration decreases as the degree of bending increases. The above universal joint can maintain the set degree of bending by increasing the tightening degree of the fixing bracket, and can freely set the bending degree by loosening the tightening degree of the fixing bracket. Can be changed. Thus, since the degree of curvature of the universal joint can be freely adjusted, the mounting angle of the acoustic vibration output body can be set freely.

  FIG. 5 is a view showing a state where the universal joints 11, 13, 15, and 41 and the dummy (decorative leaf) universal joints 17, 19, and 37 shown in FIG. 4 are curved. 5 (a) and 5 (b), the same components as those in FIGS. 4 (b) and 4 (c) are denoted by the same reference numerals.

  As shown in FIGS. 5 (a) and 5 (b), the sound generating leaf universal joints 11, 13, 15, and 41 and the dummy (decorative leaf) universal joints 17, 19, and 37 are combined into one bundle. The sound generating leaf universal joints 11, 13, 15, 41, and dummy (only one end side of the bundled bamboo straws 45, 47, 49, 51, 53) (fixed cap 57 and adhesive) are fixed. If the universal joints 17, 19, and 37 for the decorative leaves are bent in a bow shape, for example, a difference “D” is generated between the lengths of the other ends of the bamboo hook 45 and the bamboo hook 53 that are not fixed. .

  However, in the above state, the other end side of the plurality of bamboo bunches 45, 47, 49, 51, 53 bundled in the one bundle is connected to the universal joint fixing cap for sound generation described in FIG. 1 and FIG. 9. The sound generating leaf universal joint fixing screws 21, 23, 43 and the dummy (decorative leaf) universal joint fixing screws 25, 27, 39 are attached and fixed to the vibration shaft 5 and the base 7 so as not to be displaced. Thus, even if the bamboo hills 45, 47, 49, 51, 53 warp in a bow shape, the other ends of the bamboo hills 45 and 53, which are not fixed, It is possible to prevent the difference D ″ from occurring. Therefore, since each said universal joint is hold | maintained in the state fixed to the axial direction (vertical direction), the member for sound generation via the universal joint 11, 13, 15, 41 for sound generation leaves (about this) , Which will be described in detail later), and the acoustic vibration from the vibration generating unit 3 through the vibration shaft 5, the vibration shaft 5, and the base 7 can be efficiently transmitted.

  In this embodiment, the weight per unit volume is light as the skeletal members constituting the universal joints for sound generating leaves 11, 13, 15, 41, and the universal joints for dummy (decorative leaf) 17, 19, 37, and the axial direction In contrast, bamboo bamboo, which has a high strength (hardness) and is an excellent material for transmitting acoustic vibrations, was used. However, the skeleton members constituting the universal joints 11, 13, 15, 41 for the sound generating leaves and the universal joints 17, 19, 37 for the dummy (decorative leaves) are not limited to the bamboo baskets. Any material may be used as long as it has the same properties (elastic force and flexibility).

  FIG. 6 is an explanatory diagram illustrating an example of a fake leaf product (artificial leaf) used as a sound generation member in the sound generation device according to the embodiment of the present invention.

  As shown in FIG. 6, the artificial leaf 59 as a sound generating member has a stem portion with a universal joint for sound generating leaves (11, 13, 15, 41) via a cylindrical fixing fitting 61 for connection. The fixing cap 57 is attached and fixed to the end portion on which the fixing cap 57 is covered. As described above, the other end side of the sound generating leaf universal joint 11 is connected to the vibration shaft 5 via the sound generating universal joint fixing cap 9 and the other end side of the sound generating leaf universal joints 13, 15, 41. Are fixedly attached to the pedestal 7 via the universal joint fixing screws 21, 23, 43 for sound generating leaves. Thereby, the acoustic vibration from the vibration generating unit 3 is transmitted to the universal joints 11, 13, 15, 41 for sound generating leaves.

  FIG. 7 is a diagram showing an example of the structure of the artificial leaf 59 shown in FIG. In FIG. 7, FIG. 7A is a front view of the artificial leaf 59, and FIG. 7B is a side view of the artificial leaf 59.

  In the example described in FIG. 7, the central axis 63 that is the veins of the artificial leaf 59 and a plurality of (four in FIG. 7) branch axes 65, 67, 69, 71, 73, 75, 77, 79. For example, it has elasticity and flexibility, such as the bamboo bamboo mentioned above, is light in weight per unit volume, has high strength (hardness) in the axial direction, and transmits acoustic vibrations. A member having an excellent material is also used. The central shaft 63 extends in the longitudinal direction of the artificial leaf 59, and the plurality of branch shafts 65, 67, 69, 71 are branched (branched) in a diagonally upward left direction from the central shaft 63. . On the other hand, the plurality of branch shafts 73, 75, 77, 79 branch (branch) obliquely upward to the right from the central axis 63, and the branch (branch) positions from the central shaft 63 are all branches. The positions of the shafts 65, 67, 69, and 71 are set at positions deviated from the branch (branch) position from the central axis 63.

  The structure of the connecting portion between the central shaft 63 and the branch shafts 65, 67, 69, 71, 73, 75, 77, 79 is such that each branch shaft 65, 67, 69, 71, 73, 75, 77, 79 is The structure is set such that it can be reliably connected to the central shaft 63 and can maintain a connection with a predetermined hardness. By making the connection structure between the central shaft 63 and the branch shafts 65, 67, 69, 71, 73, 75, 77, 79 as described above, the efficiency of generating sound from the artificial leaf 59 is improved. It becomes possible to increase.

  The two diaphragms 81 and 83 with the central shaft 63 and the branch shafts 65, 67, 69, 71, 73, 75, 77, and 79 as skeleton members and whose contours are edged are shown in FIG. As shown in FIG. 5, the center shaft 63 and the branch shafts 65, 67, 69, 71, 73, 75, 77, 79 are sandwiched with a commercially available adhesive. As the material constituting the diaphragms 81 and 83, a material that absorbs water and has a property of shrinking when dried, such as Japanese paper or a film material, is employed. For the diaphragms 81 and 83, a material such as Japanese paper (or film) on which images such as various illustrations and photographs are printed out in advance is used as necessary.

  As an adhesive for bonding the diaphragms 81 and 83 to the central shaft 63 and the branch shafts 65, 67, 69, 71, 73, 75, 77, and 79, those that become colorless and transparent when solidified are used. The use of the artificial leaf 59 is desirable.

  After the diaphragms 81 and 83 are bonded to the central shaft 63 and branch shafts 65, 67, 69, 71, 73, 75, 77, and 79 using an adhesive, heat treatment is performed. By using the contraction, the diaphragms 81 and 83 can be stretched, and an optimum structure can be obtained as a member for generating sound. In addition, in order to make the artificial leaf 59 look like a natural plant leaf as much as possible, a photograph (image) of the leaf of the natural plant is pasted on the diaphragms 81 and 83 so that it is close to the leaf of the natural plant. Artificial plant leaves can be created.

  FIG. 8 is a portion showing a connection structure (attachment structure) of the plurality of branch shafts 65, 67, 69, 71, 73, 75, 77, 79 to the central shaft 63 in the artificial leaf 59 shown in FIG. It is a perspective view.

  As shown in FIG. 8, each branch axis (any one of 65, 67, 69, 71 and any one of 73, 75, 77, 79) is connected to the central axis 63 at each branch axis. Branch shaft fixing auxiliary plates (leaf vein fixing auxiliary plates) 85 and 87 for fixing (any of 65, 67, 69, 71 and any of 73, 75, 77, 79) to the central shaft 63 are attached. ing. The branch shaft fixing auxiliary plates 85 and 87 are attached and fixed to the connection portion in a state where the shape viewed from the top and bottom is bent into a substantially U shape so as to cover the connection portion.

  FIG. 9 is an explanatory diagram showing the principle of sound generation in the sound generating member shown in FIG. 6, that is, the artificial leaf 59. 9A is a front view of the artificial leaf 59, and FIG. 9B is a side view of the artificial leaf 59. FIG.

  As shown in FIG. 9 (b), the artificial leaf 59 is bent continuously (smoothly) and has a universal joint (one of the universal joints for sound generating leaves (11, 13, 15, 41)). In the middle part, the artificial leaf 59 is bent continuously (smoothly), for example, when the artificial leaf 59 is subjected to steps such as heat treatment, force application, and drying treatment. A method of passing through, or a method of drying the artificial leaf 59 after being bent while applying steam, and a method of forcibly bending the artificial leaf 59 by attaching a weight to the tip side thereof. 9, the same components as those described in FIGS. 6 and 7 are denoted by the same reference numerals, and detailed description thereof is omitted.

  FIG. 10 is an explanatory diagram showing the principle of sound generation in the sound generating member shown in FIG. 9, that is, the artificial leaf 59.

  As shown in FIG. 10, the artificial leaf 59 is curved (continuously (smoothly)) so that the axial direction of the artificial leaf 59 has a substantially arc shape as a whole. Then, a line segment connecting the starting end portion of the curve and the end portion of the curve, and a direction perpendicular to the axial direction when the axial direction of the artificial leaf 59 is linear (in FIG. 10) It is set so that the angle formed with the horizontal axis direction is approximately 45 degrees. In other words, the length of the arc from the beginning of the curve to the end of the curve in the artificial leaf 59 is a diagram substantially parallel to the horizontal axis in FIG. 10 and the axis of the artificial leaf 59 that is linear. 10 has a length of about 1/4 of a circle having a radius r = 0.64x centered at the intersection with the vertical axis.

  By bending the axial direction of the artificial leaf 59 in the above-described manner, the portion that vibrates most in the axial direction of the artificial leaf 59 becomes the central region of the artificial leaf 59. Therefore, the artificial leaf 59 Therefore, it becomes possible to generate sound efficiently.

  The acoustic vibration from the vibration generating unit 3 is transmitted to the artificial leaf 59 through the vibration shaft 5, the (pedestal 7), the universal joint for sound generating leaf (11, 13, 15, 41), etc. The acoustic vibration is converted into acoustic vibration in a direction perpendicular to the surface at the center of the artificial leaf 59 in a state of being curved in an arc shape in the artificial leaf 59. In other words, the lower portion of the artificial leaf 59 (a universal joint for generating sound) (curved joint) (an acoustic leaf generating joint) is warped so as to have a curvature radius of about 0.64 times the longitudinal length (axial direction) of the artificial leaf 59 in advance. The surface of the artificial leaf 59 is applied by applying acoustic vibration along the axial direction of the artificial leaf 59 when the warp is not generated from the portion connected to 11, 13, 15, 41). Therefore, acoustic vibration is output in a direction of approximately 90 degrees.

  FIG. 11 is an explanatory diagram showing an example of the directivity characteristic of the acoustic vibration in the artificial leaf 59 shown in FIG. In FIG. 11, FIG. 11 (a) shows the directivity characteristics of the acoustic vibration viewed from the side of the artificial leaf 59, and FIG. 11 (b) shows the artificial leaf 59 shown in FIG. 11 (a). The directivity characteristics of acoustic vibrations as seen from above are shown. In FIG. 11, the length of the thick arrow represents the intensity of the acoustic vibration output from the artificial leaf 59.

  At the substantially central portion of the curved surface of the artificial leaf 59, the directivity characteristic of the acoustic vibration in the direction intersecting with the curved surface is as shown in FIG. The directivity characteristic of acoustic vibration output in a direction forming an angle of approximately 90 degrees with respect to the surface on the concave surface side is the strongest, and becomes weaker as the angle decreases from 90 degrees. On the other hand, on the curved convex surface side of the artificial leaf 59, the directivity characteristic of the acoustic vibration output in a direction forming an angle of approximately 90 degrees with respect to the surface is also in a plurality of directions forming an angle smaller than 90 degrees. The directivity characteristics of the output acoustic vibrations are not much different in intensity.

  As shown in FIG. 11B, the output characteristic of the acoustic vibration output along the curved surface of the artificial leaf 59 has the strongest directivity characteristic of the acoustic vibration output along the central axis. It becomes weaker as the angle made with the shaft increases. On the other hand, in the artificial leaf 59, the output characteristic of the acoustic vibration output in the direction opposite to the central axis is the same as that of the acoustic vibration output in the direction opposite to the central axis. The directivity characteristics of the acoustic vibrations output in a plurality of directions at different angles are not so different in intensity.

  FIG. 12 is a diagram showing another example of the artificial leaf structure shown in FIG. 12, FIG. 12 (a) is a front view of the artificial leaf 91, and FIG. 12 (b) is a side view of the artificial leaf 91.

  The artificial leaf 91 shown in FIG. 12 and the artificial leaf 59 shown in FIG. 7 are a plurality of branch shafts 95, 97, 99, 101, each of which has an artificial leaf 91 extending obliquely upward to the left. ,... From the central axis 93 and branch positions from the central axis 93 of the plurality of branch shafts 103, 105, 107, 109,. It differs from the artificial leaf 59 shown in FIG. 7 in that the corresponding branch axes are set at the same position. The other points are the same as those of the artificial leaf 59 shown in FIG.

  FIG. 13 is an explanatory diagram illustrating an example of an attachment mode of the plurality of artificial leaves used as the sound generation member illustrated in FIG. 6 to the vibration device. In FIG. 13, FIG. 13 (a) is a view of the manner in which a plurality of artificial leaves are attached to the vibration device from above, and FIG. 13 (b) is a drawing of the plurality of artificial leaves to the vibration device. It is the figure which looked at the attachment mode of from the side.

  In the mounting mode shown in FIG. 13, three artificial leaves, each at an angle at which they do not touch or collide with each other (for example, at intervals of 120 degrees with respect to the vibration axis 5), each sound generating leaf It is held and arranged by universal joints ((11), 13, 15, 41). Since the attachment structure of each artificial leaf to the vibration device via the universal joint for sound generating leaves ((11), 13, 15, 41) is as described above, detailed description thereof is omitted. .

  In the example illustrated in FIG. 13, the case where three artificial leaves are used has been described, but of course, the number of artificial leaves is not limited to three.

s FIG. 14 is explanatory drawing which shows another example of the attachment aspect to the vibration apparatus of the several artificial leaf used as a member for sound generation as described in FIG. 6, FIG. 15 is the description of FIG. It is explanatory drawing which shows another example of the attachment aspect to the vibration apparatus of the some artificial leaf used as a member for sound generation. The examples shown in FIGS. 14 and 15 show a case where a plurality of (three in the figure) artificial leaves are combined with a vibration generating unit to be installed indoors as an interior speaker.

  In FIG. 14, the example shown in FIG. 14A is an attachment mode called a so-called potted plant type, and the example shown in FIG. 14B is an installation mode called a floor stand type. In FIG. 15, the example shown in FIG. 15 (a) is an attachment mode called a type with a display board, and the example shown in FIG. 15 (b) is an attachment mode called a wall-hanging type. is there. Various aspects other than the above can be conceived. For example, a configuration in which a plurality of artificial leaves combined with a vibration generating unit is integrated with a lighting fixture can be conceived.

  FIG. 16 is a diagram illustrating another example of each part constituting the vibration transmission system in the vibration device illustrated in FIG. 1. 16A is a view of the vibration transmission system as viewed from above, and FIG. 16B is a vibration generating section when cut along the line DD ′ in FIG. 16A. 3 and a sectional view of a vibration shaft 5.

  In the present embodiment, the vibration transmission system is composed of the vibration shaft 5 and a plurality of (five in FIG. 16 (a)) universal joints (111, 113, 115, 117) bundled in one bundle. 119), and a plurality of universal joints for sound generating leaves (111, 113, 115, 117, 119) by fixing brackets 121, 123 and fixing screws 125, 127 for mounting and fixing to the vibration shaft 5. Composed. In this embodiment, the base 7 as shown in FIGS. 1 and 2 is not used.

  As shown in FIG. 16 (a), the fixing bracket 121 has its central portion curved in a substantially semicircular shape so as to be in close contact with the substantially semicircular portion of the outer peripheral surface of the vibration shaft 5. A through-hole having a female thread portion is formed in a portion closer to each other so that a fixing screw can be screwed together. On the other hand, the fixing bracket 123 has a central portion of the remaining substantially semicircular portion of the outer peripheral surface of the vibration shaft 5 and a plurality of sound generating leaf universal joints (111, 113, 115) bundled in one bundle. 117, 119) can be accommodated in a semi-elliptical shape, and through holes having female screw portions are formed at positions near both ends so that fixing screws can be screwed respectively. A pair of through-holes on the fixing bracket 121 side and a pair of through-holes on the fixing bracket 123 side are a plurality of universal joints for sound generating leaves (111, 113, 115, 117, 119) bundled in one bundle. Are fixed so that the positions of the corresponding through holes coincide with each other when the fixtures 121 and 123 are attached and fixed to the vibration shaft 5 in cooperation with each other. 16 (a) and 16 (b), the same components as those shown in FIG. 2 are denoted by the same reference numerals, and detailed description thereof is omitted.

  FIG. 17 is a diagram showing still another embodiment of each part constituting the vibration transmission system in the vibration device shown in FIG. 17A is a diagram of the vibration transmission system as viewed from above, and FIG. 17B is a vibration generator when cut along the line EE ′ of FIG. 17A. 3 and a sectional view of a vibration shaft 5.

  In the present embodiment, as in the embodiment shown in FIG. 16, the vibration transmission system has a plurality of (5 in FIG. 17 (a)) sound generations in which the vibration shaft 5 and one bundle are bundled. One for attaching and fixing the universal joint for leaves (111, 113, 115, 117, 119) and a plurality of universal joints for sound generating leaves (111, 113, 115, 117, 119) to the vibration shaft 5 The fixing bracket 129. Also in this embodiment, the base 7 as shown in FIGS. 1 and 2 is not used.

  As shown in FIG. 17A, the fixture 129 has a substantially cylindrical shape, a base portion 129a having a larger diameter than the vibration shaft 5, and a generally trapezoidal shape, a universal joint holding portion 129b having a smaller diameter than the base portion 129a. And having. As shown in FIG. 17B, the base portion 129a is a portion of the portion from the substantially middle portion of the vibration shaft 5 to the upper end portion thereof in a state where at least a part of the inner peripheral surface is in close contact with the outer peripheral surface of the vibration shaft 5. The outer peripheral surface is covered over the entire circumference, and the side surface thereof has a substantially cylindrical shape. The universal joint holding portion 129b is located above the base portion 129a as shown in FIG. The universal joint holding portion 129b is formed integrally (continuously) with the base portion 129a, and forms a universal joint holding portion 129b with a small diameter tapered from the upper end portion of the base portion 129a.

  As shown in FIG. 17 (b), the plurality of sound generating leaf universal joints (111, 113, 115, 117, 119) are separated from the upper end of the vibration shaft 5 by the universal joint holding part 129 b. Held by. Therefore, the acoustic vibration generated in the vibration generating unit 3 is transmitted from the vibration shaft 5 to each of the sound generating leaf universal joints (111, 113, 115, 117, 119) via the fixing bracket 129.

  The metal material constituting the fixing bracket 129 is flexible, and has a flexible shaft 5 for insertion into the base portion 129a and a plurality of free-for-sound generating leaves inserted into the universal joint holding portion 129b. A metal material having an elastic force that generates a biasing force that biases the joint (111, 113, 115, 117, 119) in a tightening direction is employed. Therefore, in this embodiment, there is no need for a fixing metal fastening member (fixing screw) as shown in FIG.

  By the way, a speaker system has been proposed that aims to expand the reproduction band in the low frequency direction without increasing the size of the medium / high-frequency speaker (Japanese Patent Laid-Open No. 5-284586). In this proposal, an acoustic port is provided on the side surface of the first cabinet in the form of a closed acoustic tube disposed in front of the speaker unit.

  Also, a speaker device has been proposed that aims to reproduce a desired low-frequency signal with as flat frequency characteristics as possible while being small (Japanese Patent Laid-Open No. 2003-289593). In this proposal, the resonance frequency of the acoustic tube is set to a frequency 0.5 to 2.5 octaves higher than the resonance frequency of Helmholtz by the acoustic volume portion and the acoustic tube, and the acoustic volume portion and the acoustic tube constitute a Helmholtz resonator. Therefore, it resonates at a predetermined Helmholtz resonance frequency. The acoustic tube itself also has a resonance frequency.

  In the technique according to Japanese Patent Laid-Open No. 5-284586, in addition to the Helmholtz resonance by the normal Kelton method, wideband bass reproduction can be performed by increasing the output sound pressure due to the closed sound resonance, and in Japanese Patent Laid-Open No. 2003-289593, With such a technique, a signal in a continuous band from the resonance frequency of Helmholtz to the resonance frequency of the acoustic tube can be output.

  However, since the loudspeakers according to any of the above technologies have a structure that can output high-quality sound, an increase in size is inevitable. In particular, the increase in size is remarkable in the case where the bass reproduction band is wide. No matter how high-quality sound can be output, the loudspeaker with such a structure allows the sound to be output from a part above the central part of the houseplant such as a leaf or trunk. It is too large to be used as a speaker installed at a site above the center of the plant. If you use the speaker with the above structure and set it so that sound is output directly from the houseplant, there is no other way than attaching it directly to the pot where the houseplant is planted, but this method is adopted. If this is done, the sound will be output from the pot, not from the foliage plant, so the sense of incongruity cannot be wiped off.

  In view of the above, the present inventors have made it possible to set a speaker capable of outputting high-quality sound and having a wide reproduction band of low-pitched sound at a substantially central part of the houseplant. Thus, the sound from the speaker can be recognized as the sound from the foliage plant. Hereinafter, a speaker system having the above configuration will be described as another embodiment of the present invention.

  18 is a cross-sectional view of a speaker system according to another embodiment of the present invention as viewed from the front, and FIG. 19 is a top view of the speaker system shown in FIG.

  In the speaker system according to the present embodiment, a normal kelton-type woofer (that is, a speaker unit (cone) is arranged with its front face facing the air chamber with a duct and its rear face facing the sealed box, This is based on a configuration of a cabinet structure that outputs only low sounds (sounds belonging to a low frequency band). The configuration of the speaker system will be further described in detail. As apparent from FIG. 18 and FIG. 19, the speaker system is erected in a direction perpendicular to the upper surface from a housing 131 having a large-diameter cylindrical shape and a substantially central portion of the upper surface. And a first acoustic tube 133 having a cylindrical shape smaller in diameter than the housing 131. The housing 131 and the first acoustic tube 133 communicate with each other in a sealed state. The speaker system further includes a second sound that occupies a section that reaches the internal space of the housing 131 from the internal space of the first acoustic tube 133 through a communication portion between the internal space of the first acoustic tube 133 and the internal space of the housing 131. A tube 135 is also provided.

  The housing 131 is partitioned by the speaker unit 137 into an upper cabinet 139 (ie, an air chamber) and a lower cabinet 141 (ie, a sealed box). As shown in FIG. 18, the upper cabinet 139 and the lower cabinet 141 have a housing 131 of the speaker unit 137 so that the volume of the upper cabinet 139 is considerably smaller than the volume of the lower cabinet 141. The mounting fixing position in the inside is determined. The volume of the upper cabinet 139 will be described in detail later.

  As described above, the speaker unit 137 is disposed with its front surface, that is, the cone surface 137a facing the upper cabinet 139 and the back surface 137b facing the lower cabinet 141. A sound signal (electric signal) is transmitted to a speaker unit 137 from a sound source (not shown) such as a CD player via a pair of signal cables (not shown), and the sound signal (electric signal) is a voice coil constituting the speaker unit 137. Is converted into sound (vibration).

  The upper end of the first acoustic tube 133 is an open end (open to the atmosphere), and a plurality of acoustic ports 143, 145, 146, 147, 148 are provided on the side surface of the first acoustic tube 133 near the open end. Is formed. Among the above acoustic ports, the acoustic ports 146, 147, and 148 alleviate unnecessary resonance of the high frequency characteristics of the sound output from the first acoustic tube 133, and make the frequency characteristics flat so that the first acoustic tubes can be obtained. It is formed on the side surface of 133, and is set as small as possible and as small as possible so as not to affect the Helmholtz resonance frequency characteristics in the speaker system. On the other hand, the acoustic ports 143 and 145 are formed to give directivity to the sound output from the first acoustic tube 133, and the acoustic ports 143 and 145 serve as 1 of the cross-sectional area of the first acoustic tube 133. By forming about 3 to 6 ports having an opening area of about / 5, the sound output from the first acoustic tube 133 can have a certain directivity. The directivity of sound in the first acoustic tube 133 generated by forming the acoustic ports 143 and 145 and the relationship between the acoustic ports 143 and 145 and the Helmholtz resonance frequency in the first acoustic tube 133 will be described in detail later. To do.

  The second acoustic tube 135 is disposed in an internal space from the first acoustic tube 133 to the upper cabinet 139 so as to be slidable in the first acoustic tube 133. That is, the outer diameter of the second acoustic tube 135 is such that the outer diameter of the second acoustic tube 135 reciprocates in a state where the outer peripheral surface thereof and the inner peripheral surface of the first acoustic tube 133 are in close contact with each other. The diameter is set slightly smaller than the inner diameter. The second acoustic tube 135 has its lower end positioned at a position where it does not contact the cone surface 137a as a lower limit position, and is positioned at the lower limit position and an appropriate position above the lower limit position. It is fixed and attached to.

  The cone surface 137a vibrates upward / downward when the speaker unit 137 receives an audio signal (electrical signal) from a sound source (not shown). Therefore, the lower limit position is determined so that the lower end portion of the second acoustic tube 135 does not contact the cone surface 137a even when the cone surface 137a vibrates in the up / down direction. The second acoustic tube 125 functions as an upper cabinet variable unit that varies the volume of the upper cabinet 139 by moving in the internal space from the first acoustic tube 133 to the upper cabinet 139.

  Here, as the distance d between the lower end of the second acoustic tube 135 and the cone surface 137a is smaller, the output characteristics in the high frequency band in the speaker system are improved. Therefore, by appropriately moving the position of the lower end portion of the second acoustic tube 135, the distance d is variably adjusted, so that the speaker system can obtain good output characteristics not only in the low frequency band but also in the high frequency band. It becomes possible. In other words, in the kelton type speaker (kelton type woofer), a good output characteristic has been conventionally obtained only in the low frequency band, but in the first acoustic tube 133 as in the above speaker system. With the structure including the movable second acoustic tube 135, a single speaker system can obtain good output characteristics over both the low frequency band and the high frequency band.

  Next, the resonance frequency characteristic of Helmholtz in the speaker system will be described.

In the speaker system shown in FIG. 18, when there is no acoustic port 143, 145, 146, 147, 148, the sectional area of the first acoustic tube 133 and the second acoustic tube 135 is S, and the volume of the upper cabinet 139 is B If the length from the upper end (open end) of the first acoustic tube 133 to the lower end of the second acoustic tube 135 is L (variable length) and the sound velocity (≈334 m / s) is C, The Helmholtz resonance frequency f ₀ is expressed by the following equation.

f ₀ = (C / 2π) · (S / LB) ^1/2

By the way, in the above speaker system, a plurality of acoustic ports 143, 145, 146, 147, 148 are formed on the side surface of the first acoustic tube 133 in order to give directivity to the sound output from the first acoustic tube 133. However, among these acoustic ports 143, 145, 146, 147, 148, the acoustic ports 146, 147, 148 are formed on the side surfaces of the first acoustic tube 133. It will not be established. However, by setting the number of acoustic ports (146, 147, 148) to the necessary minimum number and setting their size as small as possible, at least f ₀ ≈ (C / 2π) · (S / DB) A relational expression of ^1/2 can be established. Note that the symbol D indicates the length (variable length) from the lower portion of the acoustic port 145 to the lower end portion of the second acoustic tube 135.

  FIG. 20 is an explanatory diagram showing the directivity characteristics of the sound output from the speaker system shown in FIGS. 18 and 19.

  20 (a) shows the directivity characteristics of the sound from the speaker system when the speaker system is viewed from the front direction, and FIG. 20 (b) shows the speaker system from the upper surface direction. The directional characteristics of sound from the speaker system when viewed are shown respectively.

  As is apparent with reference to FIGS. 20A and 20B, the sound output to the outside of the speaker system through the first acoustic tube 133 is in the vertical direction (longitudinal direction) of the first acoustic tube 133. ), And the side direction (lateral direction) of the first acoustic tube 133 is omnidirectional.

  FIG. 21 is a diagram illustrating the attenuation characteristics of the sound output from the speaker system illustrated in FIGS. 18 and 19 from the low frequency band to the high frequency band.

  In FIG. 21, the vertical axis plots attenuation (unit: dB) and the horizontal axis plots frequency (unit: Hz). A curve 151 is an attenuation characteristic of the sound output from the speaker system when the second acoustic tube 135 is provided, and a curve 153 is output from the speaker system when the second acoustic tube 135 is not provided. The acoustic attenuation characteristics are shown respectively. Comparing and contrasting the curve 151 and the curve 153, the attenuation in the high frequency band of the sound output from the speaker system is sufficiently smaller when the second acoustic tube 135 is provided than when the second acoustic tube 135 is not provided. It is clear.

  As described above, according to the speaker system according to another embodiment of the present invention, the relationship between the volume of the upper cabinet 139 and the volume of the lower cabinet 141 shown in FIG. And the length of the second acoustic tube 135, the number of installed acoustic ports 143 and 145, and their sizes, etc. are designed to be appropriate values, respectively, so that it is smaller than the conventional Kelton type speaker. Thus, a speaker system having good output characteristics over a wide band can be obtained. Moreover, since the speaker system can be reduced in size, the speaker system can be easily installed, for example, in a potted portion of a houseplant. In this way, even if the speaker system is installed in the pot part of a houseplant, it is small and inconspicuous, so that the sound from the speaker system is as if the sound is from the houseplant itself. It can also be recognized. In the design method of the speaker system, a conventionally used calculation method can be used as it is.

  The preferred embodiments of the present invention have been described above, but these are merely examples for explaining the present invention, and the scope of the present invention is not limited to these embodiments. The present invention can be implemented in various other forms.

The figure which showed the whole structure of the vibration apparatus with which the sound generator which concerns on one Embodiment of this invention is provided. The figure which showed each part which comprises a vibration transmission system | strain in the vibration apparatus described in FIG. The figure which showed the casing and vibration generation part which comprise the vibration apparatus described in FIG. The figure which showed the structure of the universal joint for sound generating leaves described in FIG.1 and FIG.2, and the universal joint for dummy (decorative leaf). The figure which showed the state when the universal joint for sound generation leaves described in FIG. 4 and the universal joint for dummy (decorative leaf) curved. BRIEF DESCRIPTION OF THE DRAWINGS In the sound generator which concerns on one Embodiment of this invention, explanatory drawing which shows an example of the imitation product (artificial leaf) of the leaf used as a member for sound generation. The figure which showed an example of the structure of the artificial leaf described in FIG. The fragmentary perspective view which shows the connection structure (attachment structure) to the central axis of the several branch shaft in the artificial leaf described in FIG. FIG. 7 is an explanatory view showing the principle of sound generation in the sound generating member described in FIG. 6, that is, an artificial leaf. FIG. 10 is an explanatory diagram showing the principle of sound generation in the sound generating member described in FIG. 9, that is, an artificial leaf. Explanatory drawing which shows an example of the directivity characteristic of the acoustic vibration in the artificial leaf described in FIG. The figure which showed another example of the structure of the artificial leaf described in FIG. Explanatory drawing which shows an example of the attachment aspect to the vibration apparatus of the some artificial leaf used as a member for sound generation described in FIG. Explanatory drawing which shows another example of the attachment aspect to the vibration apparatus of the some artificial leaf used as a member for sound generation described in FIG. Explanatory drawing which shows another example of the attachment aspect to the vibration apparatus of the some artificial leaf used as a member for sound generation described in FIG. The figure which showed another Example of each part which comprises a vibration transmission system | strain in the vibration apparatus described in FIG. The figure which showed further another Example of each part which comprises a vibration transmission system in the vibration apparatus described in FIG. Sectional drawing seen from the front direction of the speaker system which concerns on other embodiment of this invention. The top view of the speaker system described in FIG. Explanatory drawing which shows the directional characteristic of the sound output from the speaker system described in FIG.18 and FIG.19. The figure which showed the attenuation | damping characteristic ranging from the low frequency band of the sound output from the speaker system described in FIG. 18 and FIG. 19 to a high frequency band.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Casing 3 Vibration generating part 5 Vibration shaft 7 Base 9 Sound generating universal joint fixing cap 11, 13, 15, 41, 111, 113, 115, 117, 119 Sound generating leaf universal joint 17, 19, 37 Dummy (decoration Universal joint fixing screw for leaf) Universal joint fixing screw for sound generating leaf 25, 27, 39 Universal joint fixing screw for dummy (decorative leaf) 29 Decoration holder 31, 33 O-ring for holding vibration shaft 35 Air gap 44 Base Fixing screws 45, 47, 49, 51, 53 Bamboo bars 55 Heat-shrinkable tubes 57 Fixing caps 59, 91 Artificial leaves 61 Cylindrical fixing fittings 63, 93 Central shafts 65, 67, 69, 71, 73 75, 77, 79, 95, 97, 99, 101, 103, 105, 107, 109 Branch shaft 81, 83 Diaphragm 85, 87 Branch shaft fixing auxiliary plate (Leaf vein fixation assist plate)
121, 123, 129 Fixing bracket 125, 127 Fixing screw

Claims (12)

An electrical signal / acoustic vibration converter for converting electrical signals from the sound source into acoustic vibrations;
A rigid body extending substantially in a straight line, one end side is connected to the electric signal / acoustic vibration conversion unit, and the acoustic vibration from the electric signal / acoustic vibration conversion unit transmitted from one end side is transmitted to the other end side. An acoustic vibration transmission member for guiding
The elastic vibration from the acoustic vibration transmission member is attached to the other end side of the acoustic vibration transmission member. A joint member for leading to
An acoustic vibration output body that is curved with a predetermined curvature and is modeled on the shape of a specific part of a plant that is detachably held on the other end of the joint member, and is transmitted through the joint member. An acoustic vibration output body that outputs acoustic vibrations as audible sound in a predetermined directivity direction;
A sound generator comprising: The sound generator according to claim 1,
An acoustic generator in which the joint member is detachably attached to the other end side of the acoustic vibration transmission member via a fixture. The sound generator according to claim 1,
The linear elastic material having flexibility is a bamboo string, and the joint member fixes a bundle of a plurality of bamboo strings, a heat-shrinkable tube surrounding the bundle, and the bundle of bamboo strings. A sound generator having a fixing member for the purpose. The sound generator according to claim 1,
The acoustic generator in which the predetermined curvature is set to about 0.64 times the axial length of the acoustic vibration output body. The sound generator according to claim 1,
An acoustic generator in which the acoustic vibration output body is created to resemble a flower or a plant. The sound generator according to claim 1,
A plurality of the acoustic vibration output bodies and a plurality of the joint members are provided, and each acoustic vibration output body is held by a different joint member so as not to contact each other. . The sound generator according to claim 1,
An acoustic generator further comprising one or a plurality of dummy acoustic vibration output bodies having substantially the same shape as the acoustic vibration output body. The sound generator according to claim 7,
The one or a plurality of dummy acoustic vibration output bodies are supported by structures that do not transmit acoustic vibrations from the acoustic vibration transmission member in such a positional relationship that they do not contact the acoustic vibration output bodies. A sound generator held by different joint members. A housing;
A first acoustic tube having one end open to the outside and the other end communicating with the internal space of the housing;
A speaker unit provided in an internal space of the housing, wherein the cone surface is disposed in the internal space so as to face a portion facing the other end of the first acoustic tube, and the internal space is opened to the outside. A speaker unit that partitions the first cabinet and a second cabinet that is sealed off from the outside,
A second acoustic tube that is slidably provided in a portion from the first acoustic tube to the internal space of the first cabinet, the end of the second acoustic tube facing the cone surface being the cone surface A second acoustic tube that is positioned and fixed at an arbitrary position apart from the position that does not contact the reference position as a reference position;
A speaker system comprising: The speaker system according to claim 9, wherein
The reference position is a position where the end portion of the second acoustic tube does not contact the cone surface even if the cone surface vibrates due to an electrical signal output from the sound source to the speaker unit. A certain speaker system. The speaker system according to claim 9, wherein
A speaker system in which one or a plurality of acoustic ports are provided on a side opened to the outside of the first acoustic tube. The speaker system according to claim 11, wherein
The speaker system in which the number and size of the acoustic ports are set in a range that does not significantly affect the Helmholtz resonance frequency characteristics in the speaker system.

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