WO2013089239A1 - 楽器の響板を振動させるためのアクチュエータ及びその取り付け方法 - Google Patents
楽器の響板を振動させるためのアクチュエータ及びその取り付け方法 Download PDFInfo
- Publication number
- WO2013089239A1 WO2013089239A1 PCT/JP2012/082547 JP2012082547W WO2013089239A1 WO 2013089239 A1 WO2013089239 A1 WO 2013089239A1 JP 2012082547 W JP2012082547 W JP 2012082547W WO 2013089239 A1 WO2013089239 A1 WO 2013089239A1
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- WIPO (PCT)
- Prior art keywords
- soundboard
- bobbin
- magnetic path
- actuator
- voice coil
- Prior art date
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Classifications
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10H—ELECTROPHONIC MUSICAL INSTRUMENTS; INSTRUMENTS IN WHICH THE TONES ARE GENERATED BY ELECTROMECHANICAL MEANS OR ELECTRONIC GENERATORS, OR IN WHICH THE TONES ARE SYNTHESISED FROM A DATA STORE
- G10H1/00—Details of electrophonic musical instruments
- G10H1/32—Constructional details
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10H—ELECTROPHONIC MUSICAL INSTRUMENTS; INSTRUMENTS IN WHICH THE TONES ARE GENERATED BY ELECTROMECHANICAL MEANS OR ELECTRONIC GENERATORS, OR IN WHICH THE TONES ARE SYNTHESISED FROM A DATA STORE
- G10H3/00—Instruments in which the tones are generated by electromechanical means
- G10H3/12—Instruments in which the tones are generated by electromechanical means using mechanical resonant generators, e.g. strings or percussive instruments, the tones of which are picked up by electromechanical transducers, the electrical signals being further manipulated or amplified and subsequently converted to sound by a loudspeaker or equivalent instrument
- G10H3/22—Instruments in which the tones are generated by electromechanical means using mechanical resonant generators, e.g. strings or percussive instruments, the tones of which are picked up by electromechanical transducers, the electrical signals being further manipulated or amplified and subsequently converted to sound by a loudspeaker or equivalent instrument using electromechanically actuated vibrators with pick-up means
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R31/00—Apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
- H04R9/02—Details
- H04R9/04—Construction, mounting, or centering of coil
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10H—ELECTROPHONIC MUSICAL INSTRUMENTS; INSTRUMENTS IN WHICH THE TONES ARE GENERATED BY ELECTROMECHANICAL MEANS OR ELECTRONIC GENERATORS, OR IN WHICH THE TONES ARE SYNTHESISED FROM A DATA STORE
- G10H2220/00—Input/output interfacing specifically adapted for electrophonic musical tools or instruments
- G10H2220/461—Transducers, i.e. details, positioning or use of assemblies to detect and convert mechanical vibrations or mechanical strains into an electrical signal, e.g. audio, trigger or control signal
- G10H2220/465—Bridge-positioned, i.e. assembled to or attached with the bridge of a stringed musical instrument
- G10H2220/501—Two or more bridge transducers, at least one transducer common to several strings
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10H—ELECTROPHONIC MUSICAL INSTRUMENTS; INSTRUMENTS IN WHICH THE TONES ARE GENERATED BY ELECTROMECHANICAL MEANS OR ELECTRONIC GENERATORS, OR IN WHICH THE TONES ARE SYNTHESISED FROM A DATA STORE
- G10H2220/00—Input/output interfacing specifically adapted for electrophonic musical tools or instruments
- G10H2220/461—Transducers, i.e. details, positioning or use of assemblies to detect and convert mechanical vibrations or mechanical strains into an electrical signal, e.g. audio, trigger or control signal
- G10H2220/505—Dual coil electrodynamic string transducer, e.g. for humbucking, to cancel out parasitic magnetic fields
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/02—Casings; Cabinets ; Supports therefor; Mountings therein
- H04R1/028—Casings; Cabinets ; Supports therefor; Mountings therein associated with devices performing functions other than acoustics, e.g. electric candles
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R11/00—Transducers of moving-armature or moving-core type
- H04R11/02—Loudspeakers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2209/00—Details of transducers of the moving-coil, moving-strip, or moving-wire type covered by H04R9/00 but not provided for in any of its subgroups
- H04R2209/024—Manufacturing aspects of the magnetic circuit of loudspeaker or microphone transducers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2440/00—Bending wave transducers covered by H04R, not provided for in its groups
- H04R2440/05—Aspects relating to the positioning and way or means of mounting of exciters to resonant bending wave panels
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2440/00—Bending wave transducers covered by H04R, not provided for in its groups
- H04R2440/07—Loudspeakers using bending wave resonance and pistonic motion to generate sound
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R31/00—Apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor
- H04R31/006—Interconnection of transducer parts
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R7/00—Diaphragms for electromechanical transducers; Cones
- H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
- H04R7/04—Plane diaphragms
- H04R7/045—Plane diaphragms using the distributed mode principle, i.e. whereby the acoustic radiation is emanated from uniformly distributed free bending wave vibration induced in a stiff panel and not from pistonic motion
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
- H04R9/02—Details
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49002—Electrical device making
- Y10T29/49005—Acoustic transducer
Definitions
- the present invention relates to a voice coil type actuator for positively applying physical vibration to a soundboard of a musical instrument, a method for attaching the actuator to a musical instrument, and a musical instrument equipped with the actuator, It relates to the manufacturing method.
- Patent Document 1 discloses a technique for radiating sound from a soundboard by attaching an electromagnetic speaker to the soundboard and vibrating the soundboard with the electromagnetic speaker.
- a voice coil type actuator that generates a driving force by inputting a driving signal to a voice coil arranged in a path (magnetic path) of a magnetic field line. Since such an actuator has a structure close to that of a voice coil type speaker, the cost can be suppressed.
- the dimension of the vibration direction of the voice coil needs to be the length of the same direction of the magnetic path plus the maximum amplitude of the voice coil or the length of play. There is. Then, in order to obtain a stable driving force, the vibrating portion that vibrates together with the voice coil and the magnetic path forming portion that forms the magnetic path are arranged so that their relative positions in the vibration direction have a desired relationship. Accurate installation is required.
- the yoke is fixed to the support column after the bobbin is connected to the soundboard. In that case, it is necessary to finely adjust the position of the bobbin in the vibration direction in order to attach the bobbin and the yoke to accurate positions, and the adjustment work becomes complicated.
- an electromagnetic speaker that is used as an actuator for vibrating a soundboard as in the prior art described above, for example, has a voice coil provided on a bobbin disposed in a path (magnetic path) of a line of magnetic force formed by a magnet and a yoke.
- the driving force is generated by inputting a driving signal to the voice coil.
- a magnetic path is formed between the yokes facing each other, and a bobbin is disposed between these yokes.
- Patent Document 1 describes that after a bobbin is fixed to a soundboard, a yoke is attached in accordance with the position. In this case, since the operator performs an operation of fixing the magnet and the yoke while finely adjusting the position of the yoke in various directions so that the bobbin and the yoke do not contact with each other, the operation becomes complicated.
- an object of the present invention is to provide a voice coil type actuator that can be easily attached to a soundboard. It is another object of the present invention to provide a voice coil type actuator that can be easily attached to a soundboard so that the arrangement of the voice coil in the magnetic path space is a desired ideal arrangement.
- the present invention provides an actuator for vibrating a soundboard of a musical instrument, comprising a magnetic path forming portion configured to form a magnetic path space, and a voice coil, A bobbin that arranges a voice coil in the magnetic path space, and a connecting member that is coupled to the bobbin and configured to vibrate along with vibration of the bobbin, the connecting member being a soundboard of the instrument
- an actuator having a connection end portion suitable for being connected to and having an adjustable length.
- the connecting member coupled to the bobbin indirectly connects the bobbin to the soundboard of the musical instrument, and transmits the vibration of the bobbin (voice coil) to the soundboard.
- the length of the connecting member is adjustable, when the actuator is attached to the soundboard, the length of the connecting member is adjusted without moving the position of the magnetic path forming part and the bobbin (voice coil). Can be connected to the soundboard. Therefore, the actuator can be easily attached to the soundboard.
- the connecting member while maintaining the relative positional relationship between the magnetic path forming portion and the bobbin (voice coil) at a predetermined attachment reference position, only the length of the connecting member can be adjusted to connect the connecting member to the soundboard. Therefore, it is possible to easily perform an operation for mounting the magnetic path forming unit and the bobbin (voice coil) in a state where the relative positional relationship is set to a desired ideal arrangement (attachment reference position).
- the connecting member may include a rod-shaped member and a screw structure that converts a rotational displacement of the rod-shaped member into a linear displacement of the rod-shaped member.
- connection member includes a first member coupled to the bobbin, a second member coupled displaceably to the first member, and a coupling portion of the first member and the second member. And a fastening tool for fastening and fixing.
- the actuator a support part that supports the magnetic path forming part, a sound board to which the connection end part is connected, a performance operator, and an operation of the performance operator
- a musical instrument includes a signal generator for generating a drive signal representing an audio waveform, wherein the drive signal is supplied to the actuator to drive the voice coil.
- a method of attaching the actuator to a musical instrument wherein a support portion is installed corresponding to the attachment position of the actuator with respect to the soundboard of the musical instrument, and the magnetic path forming portion is connected to the support portion. Adjusting the length of the connecting member so that the connecting end moves toward the soundboard, connecting the connecting end to the soundboard, and Fixing the length of the connecting member adjusted to be connected to a soundboard.
- an actuator for vibrating a soundboard of a musical instrument comprising: a magnetic path forming portion configured to form a magnetic path space; and a voice coil; A bobbin disposed in the magnetic path space; and an end member coupled to an end of the bobbin and suitable for being connected to a soundboard of the musical instrument, wherein the magnetic path forming unit includes the bobbin A through-hole penetrating in the axial direction of the voice coil is formed in the portion, and at the position of the end member facing the through-hole,
- a mark for specifying a position where a fixing member for connecting an end member to the soundboard is to be attached is provided.
- a through hole is formed in the portion of the magnetic path forming part inserted into the internal space of the bobbin, and the position where the fixing member is to be attached at the end member facing the through hole Since the mark for specifying is provided, the fixing work using the fixing member can be easily performed corresponding to the mark.
- a tool for example, screw driver
- a fixing member for example, a screw
- the bobbin (voice coil) arranged in the magnetic path forming part it is also possible to carry a fixing work by bringing a fixing member (for example, a screw) through a through hole to a predetermined connection point.
- a fixing member for example, a screw
- the mounting operation can be performed so that the bobbin and the magnetic path forming portion do not come into contact with each other.
- a method of attaching the actuator to a musical instrument wherein a support portion is installed corresponding to the attachment position of the actuator with respect to the soundboard of the musical instrument, and the magnetic path forming portion is connected to the support portion.
- a device for vibrating a soundboard of a musical instrument comprising: a magnetic path forming unit configured to form a magnetic path space; and a voice coil, the voice coil being mounted
- An actuator comprising: a bobbin disposed in the magnetic path space; and a connecting member coupled to the bobbin and connected to the soundboard of the instrument and suitable for transmitting vibrations of the bobbin to the soundboard.
- An adjustment device arranged to correspond to the mounting position of the actuator with respect to the soundboard of the musical instrument, and configured to adjust the relative distance of the support portion to the soundboard.
- the actuator when the actuator is attached to the soundboard, the relative position of the support portion to the soundboard is adjusted without moving the relative positions of the magnetic path forming portion and the bobbin (voice coil) in the actuator, The entire support and actuator can be moved to a position where the connecting member is connected to the soundboard. Therefore, the actuator can be easily attached to the soundboard.
- the relative positional relationship between the magnetic path forming portion and the bobbin (voice coil) is maintained at a predetermined attachment reference position, only the support portion can be adjusted and the connecting member can be connected to the soundboard. It is possible to easily perform an operation for mounting in a state where the relative positional relationship between the path forming portion and the bobbin (voice coil) is set to a desired ideal arrangement (attachment reference position).
- FIG. 1 It is a perspective view which shows the external appearance of the grand piano in embodiment. It is a figure explaining the internal structure of a grand piano. It is a figure explaining the position of a vibration apparatus. It is a figure explaining the external appearance of the vibration apparatus according to the first embodiment. It is a longitudinal cross-sectional view of the vibration apparatus shown in FIG. It is a flowchart which shows the procedure of the attachment operation
- FIG. 1 is a perspective view showing an appearance of the grand piano 1 in the first embodiment of the present invention.
- this grand piano 1 has a keyboard formed by arranging a plurality of keys 2 on which performance operations are performed by the performer's hand on the front surface, and a pedal 3 for performance control.
- the grand piano 1 has the control apparatus 10 which has the operation panel 13 in the front part, and the touch panel 60 provided in the music stand part. The user's instruction can be input to the control device 10 by operating the operation panel 13 and the touch panel 60.
- the grand piano 1 is configured to be able to perform sound generation in a sound generation mode selected according to a user instruction from among a plurality of sound generation modes.
- these sound generation modes (1) just like a general grand piano, normal sound generation mode consisting only of sound generation based on string vibration sound corresponding to hammering by a hammer, and (2) stoppering of hammering by a stopper.
- the active vibration generated from the soundboard by actively physically vibrating the soundboard with the drive signal based on the audio waveform signal generated from the sound source unit such as an electronic sound source.
- a weak sound mode consisting only of a sound based on a sound (typically a sound that is smaller than a normal performance sound, but may be a loud sound); The sound generation based on the corresponding string vibration sound and the sound generation based on the active sound vibration sound generated by actively physically vibrating the sound board by the drive signal in the same manner as described above.
- Vibrator loud mode for include. In this strong sound mode, not only the volume is increased, but also a first acoustic sound having the original tone of a piano by hammering and a drive having an arbitrary tone waveform other than a piano (including a tone similar to a piano).
- a timbre layer effect can be obtained by simultaneously producing a second acoustic sound having an arbitrary additional timbre obtained by forcibly vibrating the soundboard by a signal. Accordingly, the strong sound mode can be made to function as a performance mode for obtaining a timbre layer effect.
- the electronic musical sound waveform signal (audio waveform signal) generated from the sound source unit is supplied to the headphone terminal instead of being used as a soundboard drive signal in the same configuration as the weak sound mode. Let the performer hear the sound based on the musical sound waveform signal personally (do not sound outside space).
- Table 1 below.
- the grand piano 1 can be operated in a performance mode according to a user's instruction among a plurality of performance modes.
- This performance mode includes a normal performance mode in which a user performs a performance operation and generates a sound, and an automatic performance mode in which a key is automatically driven to generate a sound.
- the grand piano 1 should just be comprised so that at least any one performance mode can be implement
- FIG. 2 is a diagram illustrating the internal structure of the grand piano 1. In this figure, the configuration provided corresponding to each key 2 is shown by focusing on one key 2, and the description provided for the portions provided corresponding to the other keys 2 is omitted. Yes.
- a key drive unit 30 that drives the key 2 using a solenoid is provided below the rear end side of each key 2 (the back side of the key 2 as viewed from the user who performs), when the performance mode is the automatic performance mode.
- the key drive unit 30 drives the solenoid in response to a control signal from the control device 10.
- the key drive unit 30 reproduces the same state as when the user pressed the key by driving the solenoid and raising the plunger, while the same state as when the user released the key by lowering the plunger To reproduce.
- the difference between the normal performance mode and the automatic performance mode is whether the key 2 is driven by a user operation or the key driving unit 30.
- the hammer 4 is provided corresponding to each key 2, and when the key 2 is pressed, a force is transmitted through an action mechanism (not shown) to move, and a string (sound generator) 5 corresponding to each key 2. Blow. Further, the damper 8 is brought into a non-contact state or a contact state with the string 5 in accordance with the depression amount of the key 2 and the depression amount of the damper pedal among the pedals 3 (hereinafter simply referred to as a damper pedal). . When the damper 8 is in contact with the string 5, the damper 8 suppresses vibration of the string 5.
- the key sensor 22 is provided below each key 2 and outputs a detection signal corresponding to the behavior of the key 2 to the control device 10.
- the key sensor 22 detects the pressing amount of the key 2 and outputs a detection signal indicating the detection result to the control device 10.
- the key sensor 22 outputs a detection signal corresponding to the amount of pressing of the key 2, but a detection signal indicating that the key 2 has passed a specific pressing position may be output.
- the specific pressing position is any position in the range from the rest position of the key 2 to the end position, and is preferably a plurality of positions.
- the detection signal output from the key sensor 22 may be any signal as long as it allows the control device 10 to recognize the behavior of the key 2.
- the hammer sensor 24 is provided corresponding to each hammer 4, and outputs a detection signal corresponding to the behavior of the hammer 4 to the control device 10.
- the hammer sensor 24 detects the moving speed immediately before the hammer 5 strikes the string 5, and outputs a detection signal indicating the detection result to the control device 10.
- the detection signal does not have to indicate the movement speed of the hammer 4 itself, and the movement speed may be calculated in the control device 10 as a detection signal in another mode.
- a detection signal indicating that the hammer shank has passed may be output for two positions where the hammer shank passes while the hammer 4 is moving, or after passing through one position, the other position.
- a detection signal indicating the time until passing through may be output.
- the detection signal output by the hammer sensor 24 may be any signal as long as it allows the control device 10 to recognize the behavior of the hammer 4.
- the pedal sensor 23 is provided corresponding to each pedal 3, and outputs a detection signal corresponding to the behavior of the pedal 3 to the control device 10.
- the depression amount of the pedal 3 is detected, and a detection signal indicating the detection result is output to the control device 10.
- the pedal sensor 23 outputs a detection signal corresponding to the depression amount of the pedal 3, but a detection signal indicating that the pedal 3 has passed a specific depression position may be output.
- the specific depressing position is any position within the range from the pedal rest position to the end position, and is a depressing position where the damper 8 and the string 5 can be completely distinguished from the non-contact state. Desirably, it is more desirable to be able to detect the state of the half pedal by setting a plurality of positions as specific depression positions.
- the detection signal output from the pedal sensor 23 may be any signal as long as it allows the control device 10 to recognize the behavior of the pedal 3.
- the control device 10 causes the hammer 4 to strike the string 5 (key-on timing), the striking speed (velocity), and its string. If the vibration suppression timing (key-off timing) of the damper 8 with respect to 5 can be specified corresponding to each key 2 (key number), the key sensor 22, the pedal sensor 23, and the hammer sensor 24 are The result of detecting the behavior of the key 2, the pedal 3, and the hammer 4 may be output as a detection signal in another mode.
- the soundboard 7 is a plate-like member made of wood.
- the soundboard 7 is provided with a piece 6 on the front surface, and a plurality of sounding rods 75 (second rod-like members) are disposed on the back surface thereof.
- the vibration of the string 5 struck by the hammer 4 is transmitted to the soundboard 7 via the piece 6.
- a vibration device (actuator) 50 is attached to the soundboard 7.
- the vibration device 50 includes a vibration member 51 connected to the soundboard 7 and a magnetic circuit element (magnetic path forming portion) 52 supported by a support portion 55.
- the support portion 55 is made of a nonmagnetic metal such as an aluminum material suitable for supporting the magnetic circuit element 52.
- the support portion 55 is fixed to the straight support 9 with a strength that can support the load of the magnetic circuit element 52.
- the straight support 9 is a plate-like member and is a part of a housing that supports the weight of the grand piano 1.
- a drive signal can be supplied from the control device 10 to the vibration device 50.
- the vibration member 51 vibrates according to the waveform indicated by the input drive signal, and vibrates the soundboard 7. Thereby, the piece 6 is also vibrated.
- the vibration device 50 is an actuator that vibrates the soundboard 7 and the piece 6.
- FIG. 3 is a diagram for explaining the arrangement of the vibration device 50.
- the vibration device 50 two vibration devices 50H and 50L are provided.
- the vibration devices 50 ⁇ / b> H and 50 ⁇ / b> L are connected to the back surface of the soundboard 7 between the two soundbars 75.
- the vibration device 50H is provided at a position corresponding to the long piece 6H among the two pieces 6 (long piece 6H, short piece 6L).
- the vibration device 50L is provided at a position corresponding to the short piece 6L. That is, the soundboard 7 is sandwiched between the vibration device 50 and the piece 6.
- the mounting position of the vibration device 50 is not limited to the bottom of the piece.
- the soundboard 7 is not required to be sandwiched between the vibration device 50 and the piece 6 and may be anywhere.
- the number of vibration devices 50 provided on the soundboard 7 is not limited to two, and may be a larger number or only one.
- the long piece 6H is a piece that supports the string 5 on the high sound side
- the short piece 6L is a piece that supports the string 5 on the low sound side.
- the pieces 6H and 6L are simply referred to as the pieces 6 when there is no need to distinguish them from each other.
- FIG. 4 is a diagram illustrating the appearance of the vibration device 50 according to the first embodiment of the present invention.
- the vibration device 50 includes a vibration member 51, a magnetic circuit element 52, and a damper 53.
- the vibration member 51 includes a voice coil 513 attached to the bobbin 511, a cap 512 coupled to the tip of the bobbin 511, a shaft 514, and a spacer 516.
- the cap 512 is a disk-shaped member.
- the shaft 514 is a rod-shaped member, one end in the longitudinal direction is fixed to the center of the circular surface of the cap 512, and a spacer 516 is attached to the other end.
- the spacer 516 is a cylindrical member, and has a flat surface on the side opposite to the side attached to the shaft 514.
- This surface is a surface having a diameter of ⁇ 1 and is connected to the soundboard 7.
- normal direction A1 the direction along the normal of this surface
- the positive direction is the direction in which this surface is facing.
- the positive direction side of the normal direction A1 of the vibration device 50 is the upper side
- the negative direction side of the normal direction A1 is the lower side.
- a surface facing upward is referred to as an upper surface
- a surface facing downward is referred to as a lower surface.
- the above-described surface of the spacer 516 is referred to as an upper surface 516A.
- the magnetic circuit element 52 has a top plate 521, a magnet 522, and a yoke 523, which are superposed in this order from above. That is, in the magnetic circuit element 52, the top plate 521 is disposed on the uppermost side, and the yoke 523 is disposed on the lowermost side.
- the damper 53 is a member formed in a disc shape with fibers or the like, and has a shape in which the surface of the disc is corrugated in a bellows shape (this shape is simplified in FIG. 4).
- the damper 53 has an end on the outer peripheral side attached to the upper surface 521A of the top plate 521 and an end on the inner peripheral side attached to the vibrating member 51, thereby supporting the vibrating member 51 so as to vibrate in the normal direction A1. ing.
- the vibration device 50 vibrates the soundboard 7 when the vibration member 51 vibrates in the normal direction A1.
- FIG. 5 is a longitudinal sectional view of the vibration device 50 shown in FIG.
- the vibration member 51 includes a bobbin 511, a cap 512, a voice coil 513, a shaft 514, a nut 515, and a spacer 516.
- the bobbin 511 is a cylindrical member having an outer diameter L1 formed of a nonmagnetic metal such as an aluminum material. Both ends of the bobbin 511 in the axial direction A2 are open.
- the axial direction A2 is a direction along the cylindrical axis B2 of the bobbin 511, and the direction from the lower side to the upper side is the positive direction.
- the voice coil 513 is a so-called voice coil that is provided on the outer peripheral surface 511D of the bobbin 511 and changes the current into vibration, and is formed of a conductive wire wound around the outer peripheral surface 511D.
- the cap 512 is a member made of a non-magnetic and highly heat-conductive metal such as an aluminum material, and is coupled to an opening portion on the upper side in the axial direction A2 of the bobbin 511 so as to block this portion.
- the cap 512 has a disk shape as a whole, and has a large disk-shaped part (upper part) on the upper side and a small disk-shaped part (lower side) on the lower side.
- the lower part has an outer diameter that is the inner diameter of the bobbin 511 and is fitted to the bobbin 511.
- the upper portion is hooked to the end of the bobbin 511 so that the cap 512 does not enter the bobbin 511.
- the cap 512 has a hole 512G that penetrates the centers of the upper side and the lower side. A female screw is cut in the hole 512G.
- the shaft 514 is an extending member that is formed in a rod shape with an aluminum metal and extends in the axial direction A2.
- the shaft 514 has a male screw that can be fitted to the female screw of the hole 512G at a half or more portion in the longitudinal direction.
- the male thread portion continues to one end of the shaft 514 in the longitudinal direction.
- the other end portion of the shaft 514 has a hexagonal column shape such as a so-called bolt head (see FIG. 4), and the hexagonal column portion can be rotated by a spanner or the like.
- the shaft 514 moves in the axial direction A2 within a predetermined range with respect to the cap 512 by rotating the hexagonal column portion.
- the predetermined range here is, for example, from the position of the shaft 514 when the lower end of the shaft 514 is moved upward until it overlaps the lower end of the hole 512G (this is the upper limit position). This is the range up to the position of the shaft 514 (this is the lower limit position) when the hexagonal column portion is moved downward to a point where it does not rotate any more.
- this range is referred to as “shaft movement range”.
- the nut 515 is a nut having a female thread that can be fitted to the male thread of the shaft 514.
- the nut 515 is fitted closer to the hexagonal column portion than the cap 512.
- the spacer 516 is a member that is fixed to the upper end of the shaft 514 in the axial direction A ⁇ b> 2 and is sandwiched between the shaft 514 and the soundboard 7.
- the spacer 516 is formed of resin or the like, and has a lower thermal conductivity than the shaft 514 and the cap 512 formed of an aluminum material.
- the above-described upper surface 516A is the upper surface of the spacer 516, that is, the surface opposite to the side fixed to the shaft 514 of the spacer 516.
- connection end portion an end portion that is on the upper side of the vibration member 51 and connected to the soundboard 7, and the spacer 516 is an end portion that forms this connection end portion. It is a member.
- the distance between the connection end and the bobbin 511 is a predetermined range, that is, when the connection end moves as the shaft 514 moves in the above-described shaft movement range, the connection end and the bobbin This is a range in which the distance to 511 changes.
- this range is referred to as “end portion movement range”.
- the cap 512, the shaft 514, the nut 515, and the spacer 516 are coupled to each other, thereby adjusting the overall length (the length from the upper end of the bobbin 511 to the connection end 516A) and resonating the bobbin 511. It functions as a connection member for connecting to the plate 7.
- this connecting member includes a rod-shaped member (shaft 514) and a screw structure (a male screw of the shaft 514 and a cap 512) that converts a rotational displacement of the rod-shaped member (shaft 514) into a linear displacement of the rod-shaped member (shaft 514). Of female thread).
- the length here is, for example, a length along the axial direction A2.
- This connection member is adapted so that the connection end is connected to the soundboard 7 while the voice coil 513 provided on the bobbin 511 is adjusted to a predetermined position in the magnetic path space 525 shown in FIG. Adjust and fix the overall length.
- the voice coil 513 and the top plate 521 are in a predetermined positional relationship, for example, the voice coil 513 is opposed to the top plate 521.
- the top plate 521 is formed in a disk shape (ring shape) with a hole in the center, for example, by a soft magnetic material such as soft iron.
- the yoke 523 has a shape in which a disc-shaped disc portion 523E and a columnar column portion 523F having an outer diameter smaller than that of the disc portion 523E are integrated by overlapping both axes, for example, with a soft magnetic material such as soft iron. Is formed.
- the cylindrical portion 523F has an outer diameter smaller than the inner diameter of the top plate 521.
- the magnet 522 is a ring-shaped permanent magnet.
- the magnet 522 has an inner diameter larger than the inner diameter of the top plate 521.
- the top plate 521, the magnet 522, and the yoke 523 are overlapped so that the respective axes are overlapped (substantially coincide) so that the top plate 521 is on the uppermost side in this order.
- the height of the cylindrical part 523F from the disk part 523E, that is, the dimension in the axial direction A3 of the cylindrical part 523F is substantially equal to the sum of the dimensions of the top plate 521 and the magnet 522 in the axial direction A3.
- the axial direction A3 is a direction along the cylindrical axis B3 of the cylindrical portion 523F, and the direction from the lower side to the upper side is the positive direction.
- the top plate 521, the magnet 522, and the yoke 523 form the magnetic path indicated by the broken line arrow in FIG. 5 by being arranged as described above.
- the vibration member 51 is a space sandwiched between the top plate 521 and the cylindrical portion 523F, and is supported by the damper 53 so that the voice coil 513 is positioned in a magnetic path space 525 that is a space where a magnetic path is formed. ing.
- the top plate 521, the magnet 522, and the yoke 523 cooperate to function as magnetic path forming means for forming the magnetic path space 525.
- the drive signal input to the vibration exciter 50 is input to the voice coil 513.
- the voice coil 513 receives the magnetic force in the magnetic path space 525, and generates a driving force so that the bobbin 511 moves and vibrates in the direction along the axial direction A2 according to the waveform indicated by the input driving signal.
- the vibration member 51 is a vibration unit that vibrates in the axial direction A ⁇ b> 2 by the drive signal input to the voice coil 513, and vibrates in a state where the voice coil 513 is disposed in the magnetic path space 525.
- the vibration device 50 is a voice coil type actuator that applies vibration by a driving force generated in the voice coil 513.
- the dimension in the axial direction A2 of the voice coil 513 (hereinafter referred to as “coil length dimension”) is larger than the dimension in the axial direction A2 of the magnetic path space 525 (hereinafter referred to as “magnetic path width dimension”). Further, the voice coil 513 can obtain a stable driving force as the change in the number of turns of the coil existing in the magnetic path space (gap) 525 decreases when the vibrating member 51 vibrates (during vibration). On the contrary, as the number of turns changes during vibration, the generated driving force changes and the desired vibration (especially amplitude) cannot be obtained.
- the end of the voice coil 513 in the axial direction A2 enters the magnetic path space 525 during vibration, in other words, the magnetic path space 525 protrudes from the voice coil 513.
- the number of turns is greatly changed, and the desired vibration cannot be obtained, and the desired sound does not occur.
- the center of the voice coil 513 in the axial direction A2 (length direction) (hereinafter referred to as “coil length center”) is the axial direction A2 (length direction) of the magnetic path space 525.
- the vibration member 51 and the magnetic circuit element 52 are arranged so that the centers thereof overlap, and the height from the top plate 521 (that is, from the upper surface 521A) to the upper end of the bobbin 511 is L2. ing.
- the coil length dimension is preferably a length obtained by adding the maximum amplitude when the vibrating member 51 vibrates to the magnetic path width dimension, or a length obtained by adding a play length to the length.
- the coil length dimension of the coil 513 is the latter length.
- the vibrating member 51 and the magnetic circuit element 52 be accurately attached so that the relative positions in the axial direction A2 have a desired relationship.
- the desired relationship here means that the coil length center and the magnetic path width center are in a relative position so as to overlap each other.
- the coil length dimension is larger than the magnetic path width dimension, but may be smaller. Even in this case, when the center of the coil length and the center of the magnetic path width overlap, the end of the coil is hardly protruded from the magnetic path space 525 during vibration, and the above phenomenon is hardly generated.
- the axis B2 of the bobbin 511 is supported by the damper 53 so as to overlap (substantially match) the axis B3 of the cylindrical portion 523F.
- This state is referred to as a state where the axes of the bobbin 511 and the cylindrical portion 523F are aligned, in other words, a state where the axes are aligned.
- the top plate 521, the magnet 522, and the yoke 523 included in the magnetic circuit element 52 are formed of a soft magnetic material or a magnet as described above and have a larger capacity than that of the vibration member 51, a metal made of resin or aluminum material. It is very heavy compared to the vibration member 51 formed of, for example. Since the load of the magnetic circuit element 52 is applied to the straight support 9 by the support portion 55, most of the load of the vibration device 50 is not applied to the soundboard 7. Although the sound board 7 is loaded with the vibration member 51, since only a slight load is applied, the influence on the vibration characteristics of the sound board 7 can be very reduced.
- FIG. 6 is a flowchart showing a procedure for attaching the vibration device 50.
- the grand piano 1 that does not include the vibration device 50 (actuator) is provided.
- a support portion 55 is attached to a predetermined portion of the grand piano 1, for example, the straight support 9.
- the arrangement of the support portion 55 is appropriately determined in association with a predetermined portion on the soundboard 7 to which the vibration device 50 (actuator) is to be attached.
- the procedure shown in FIG. 6 is started in a state where the support portion 55 is connected to the straight column 9.
- the operator attaches a predetermined fixing jig to the magnetic circuit element 52 (step S11).
- the fixing jig means that the relative position of the vibration member 51 and the magnetic circuit element 52 in the axial direction A2 is the above-described desired relationship (the ideal arrangement of the voice coil in the magnetic path space or the mounting reference position). ) Is a reference position indicating member (jig) for automatically indicating.
- FIG. 7 is a view showing the appearance of the fixing jig 54.
- the fixing jig 54 is formed in a plate shape with a magnetic material such as iron.
- FIG. 7A shows the fixing jig 54 as seen from the largest upper surface 54A side among the surfaces of the fixing jig 54 (plan view).
- the side to which the upper surface 54A faces is the upper side.
- the fixing jig 54 has a U-shape, and includes two straight portions 541 and 542 that are two straight portions in the U-shape, and a curved portion 543 that connects the straight portions. It has become.
- the ends of the straight portions 541 and 542 opposite to the curved portion 543 are separated by a distance L1 to form a space.
- FIG. 7B shows a front view of the fixing jig 54.
- the side where the end portions of the straight portions 541 and 542 can be seen that is, the side where the U-shaped internal space can be seen
- the opposite side that is, the curved portion 543 side
- the side that can be seen is called the side.
- the inner space sandwiched between the straight portions 541 and 542 is referred to as the inner side
- the opposite side that is, the side of the side
- the side to which the upper surface 54A faces is the upper side
- the opposite side is the lower side.
- the fixing jig 54 has a lower surface 54B in a portion closest to the outer side on the opposite side of the upper surface 54A.
- the lower surface 54B is on the opposite side of the region outside the broken line (hide line) of the upper surface 54A.
- the distance between the upper surface 54A and the lower surface 54B, that is, the thickness in the vertical direction of the outermost fixing jig 54 is L2. This thickness is the same as the height from the upper surface 521A on the upper side of the top plate 521 to the upper end portion of the bobbin 511 when the above-described coil length center and magnetic path width center overlap.
- the fixing jig 54 has a thickness in the vertical direction L3 (L3 ⁇ L2) on the inner side of the lower surface 54B, and a space is formed between the fixing jig 54 and a plane overlapping the lower surface 54B.
- the straight portions 541 and 542 have side surfaces 541C and 542C extending in the vertical direction on the innermost side.
- the side surfaces 541C and 542C face each other and both form an angle with the upper surface 54A.
- FIG. 8 is a view showing a state in which the position and orientation of the vibrating member 51 with respect to the magnetic circuit element 52 are restricted by the fixing jig 54.
- the shaft 514 is lowered to a position just before the lower surface of the nut 515 contacts the upper surface of the cap 512 in a state where the nut 515 is fitted to the root of the male screw portion.
- the shaft 514 may be lowered to the position where these surfaces come into contact.
- the fixing jig 54 is installed with the lower surface 54B in contact with the upper surface 521A of the top plate 521.
- the fixing jig 54 is a magnetic body as described above, the fixing jig 54 is fixed to the upper surface 521A by an attractive force (magnetic attractive force) from the top plate 521 that is magnetized by the magnetic force of the magnet 522. And the fixing jig 54 is attached so that the bobbin 511 may be inserted
- the bobbin 511 has sufficient force to move the fixing jig 54 fixed to the upper surface 521A by the magnetic attraction force in the direction other than the direction along the side surfaces 541C and 542C as described above. It will not move unless added.
- the fixing jig 54 is attached so that the axis B2 of the bobbin 511 and the axis B3 of the cylindrical portion 523F overlap (substantially match) as in the state shown in FIG.
- the bobbin 511 is supported by the damper 53 so as to be able to vibrate in the normal direction A1, but is lower than the position where the lower surface 512B of the cap 512 is in contact with the upper surface 54A of the fixing jig 54 by the fixing jig 54. It is supposed not to move to. When these surfaces come into contact with each other, the distance between the upper end of the bobbin 511 and the upper surface 521A becomes the distance between the upper surface 54A and the lower surface 54B of the fixing jig 54, that is, L2, so as described above, The magnetic path width centers substantially coincide.
- the range in which the vibration member 51 can be moved downward by the fixing jig 54 is limited, so that even if a downward force is applied from the upper side, the vibration member 51 is relative to the magnetic circuit element 52 in the normal direction A1.
- the desired position is maintained in the desired relationship.
- the worker supports (installs) the magnetic circuit element 52 on the support portion 55 (step S12).
- the operator supports the magnetic circuit element 52 after securing the arrangement (height) of the magnetic circuit element 52 so that the distance from the bobbin 511 to the soundboard 7 is within the end movement range described above.
- the part 55 is supported.
- the height of the magnetic circuit element 52 supported via the plurality of support bars is set appropriately. In other words, the operator can connect the connection end to the soundboard 7 when the length of the entire connection member is adjusted as will be described later.
- the element 52 is supported.
- the operator determines the arrangement of the support portion 55 so that the vibration member 51 including the spacer 516 is opposed to the vibration region below the predetermined vibration region on the lower surface 7B of the soundboard 7.
- the magnetic circuit element 52 is supported by the support portion 55.
- This arrangement region is predetermined as a region to which the upper surface 516A of the spacer 516 is connected, and is, for example, a region including the position of the piece 6H or the piece 6L in FIG.
- FIG. 9 is a diagram showing a state in which the magnetic circuit element 52 is supported by the support portion 55 as described above.
- the positions of the soundboard 7, the piece 6, and the support portion 55 are indicated by two-dot chain lines in order to show the positional relationship between the vibration device 50, the soundboard 7, the piece 6, and the support portion 55.
- FIG. 9 shows a state in which the width direction A4 of the piece 6 is viewed in the horizontal direction of the drawing.
- the piece 6 is provided on the upper surface 7 ⁇ / b> A of the soundboard 7.
- an excitation area C1 is predetermined on the lower surface 7B of the soundboard 7.
- the vibration region C1 is a region where a force is applied by the vibration device 50, and the center of the piece 6 in the width direction A4 is aligned with the normal direction A1 of the center of the vibration direction C1 in the width direction A4. .
- the vibration region C1 has the same shape as the upper surface 516A of the spacer 516. Specifically, the vibration region C1 is a circular region whose dimension (that is, diameter) in the width direction A4 is ⁇ 1.
- the top plate 521 is provided with a plurality of through holes (not shown) at predetermined positions near the periphery of the lower surface 521B.
- the support portion 55 is provided with a plurality of through holes penetrating from the upper side to the lower side.
- male screws are cut at both ends, and the portions where the male screws are cut are inserted into the through holes of the top plate 521 and the support portion 55, and are fastened and fixed by a plurality of nuts 552.
- the magnetic circuit element 52 is fixed to the support portion 55 as shown in the figure.
- the support portion 55 is fixed to the straight column 9 with a strength that can support the load of the magnetic circuit element 52. For this reason, the load of the magnetic circuit 52 is applied to the straight column 9 via the support portion 55. Further, the magnetic circuit element 52 is placed on the support portion 55 so that the distance L4 with the soundboard 7 is within the above-described end portion movement range, that is, the range in which the distance between the connection end portion (upper surface 516A) and the bobbin 511 is changed. It is supported. Thus, the position (height position) in the normal direction A1 (or the axial direction A2) when the magnetic circuit element 52 is supported by the support portion 55 is a position where the distance L4 is within the end movement range. Therefore, strictness is not required.
- step S12 is an example of the “support step” according to the present invention.
- the adhesive used here may be any adhesive that can bond the soundboard 7 and the spacer 516, for example, an adhesive capable of bonding wood and resin.
- the operator rotates the shaft 514 using, for example, a spanner and moves the shaft 514 upward to connect the upper surface 516A to the soundboard 7 (step S14).
- the upper surface 516A can reach the soundboard 7 without fail to be connected.
- the upper surface 516A to which the adhesive is applied is adhered to and connected to the soundboard 7.
- the series of steps S13 and S14 is an example of the “connection step” according to the present invention.
- FIG. 10 is a view showing a state in which the spacer 516 is connected to the soundboard 7.
- the shaft 514 is moved upward from the state of FIG. 9, and the upper surface 516 ⁇ / b> A is connected to the soundboard 7.
- the upper surface 516A is located below the region C1, the upper surface 516A is connected to the region C1.
- the vibration member 51 is fixed to the fixing jig as described above. Since the range that can be moved downward is limited by 54, the relative position with respect to the magnetic circuit element 52 is appropriately maintained so that the center of the coil length and the center of the magnetic path width coincide.
- the position of the shaft 514 when the shaft 514 is moved upward until the lower end of the shaft 514 overlaps the lower end of the hole portion 512G is determined as the upper limit position of the shaft movement range. For this reason, after the work of step S14 is performed, the lower end of the shaft 514 overlaps with the lower end of the cap 512, that is, the lower surface 512B, or protrudes downward from the lower end. In the example of FIG. 10, it is the latter state.
- the shaft movement range By defining the shaft movement range in this way, the length of the region of the shaft 514 supported by the hole 512G in the axial direction A2 is longer than when the lower end of the shaft 514 is located above the lower surface 512B.
- the shaft 514 is less likely to tilt in a direction intersecting the axial direction A2 such as the width direction A4 in FIG.
- step S15 the operator rotates the nut 515 using, for example, a spanner and moves it in the negative direction of the normal direction A1. Then, the shaft 514 is fixed to the cap 512 by moving the nut 515 until it can be pressed against the cap 512 (step S15). With this operation, the distance from the bobbin 511 to the upper surface 516A is fixed in a state where the upper surface 516A is connected to the soundboard 7. That is, by this work, the entire length of the connecting member described above is also fixed in a state where the upper surface 516A is connected to the soundboard 7.
- the operation in step S15 is an example of the “fixing step” according to the present invention.
- step S16 the operator removes the fixing jig 54 (step S16), and finishes the work of attaching the vibration device 50 to the grand piano 1.
- the vibration device 50 By attaching the vibration device 50 in this way, the soundboard 7 is pushed upward when the bobbin 511 moves in the positive direction of the normal direction A1, and the bobbin 511 is moved in the negative direction of the normal direction A1.
- the bobbin 511 is not separated but pulled downward by the bobbin 511. In this way, the vibration in the bobbin 511 is applied to the piece 6 via the soundboard 7 and further transmitted to the string 5.
- FIG. 11 shows a state where the vibration exciter 50 is attached.
- FIG. 11 is a diagram illustrating a state in which the attaching operation of the vibration device 50 is completed.
- the upper surface 516 ⁇ / b> A of the spacer 516 is connected to the region C ⁇ b> 1 of the soundboard 7, and the magnetic circuit element 52 is supported by the support portion 55.
- the vibration member 51 and the magnetic circuit element 52 are in a state in which the relative positions in the normal direction A1 are in a desired relationship, that is, the coil length center and the magnetic path width center match.
- the vibration device 50 it is possible to facilitate attachment to a desired position in the normal direction A1, that is, the direction in which the vibration member 51 vibrates (vibration direction).
- step S11 the fixing jig 54 is attached in a state where the axis B2 of the bobbin 511 and the axis B3 of the cylindrical portion 523F are overlapped (substantially coincident), and the state is maintained until the operation of step S15 is completed. If it does, it will be in the state by which the axial alignment of the bobbin 511 and the cylindrical part 523F was made, and the contact with the bobbin 511 and the cylindrical part 523F does not occur easily compared with the state in which this is not made.
- the magnetic circuit element 52 Since the magnetic circuit element 52 is supported by the direct support 9 via the support portion 55, most of the driving force generated in the voice coil 513 is used as thrust for vibration of the bobbin 511.
- the vibration member 51 is supported by the soundboard 7 and the damper 53 by being connected to the soundboard 7.
- the soundboard 7 and the damper 53 are each formed of wood and fiber as described above, and the rigidity of the damper 53 is significantly lower than that of the soundboard 7. For this reason, most of the load of the vibration member 51 is applied to the soundboard 7.
- the magnetic circuit element 52 is supported by the support portion 55 and is connected to the vibration member 51 only via the damper 53.
- the damper 53 has a significantly lower rigidity than any of the vibration member 51 (aluminum material, resin), the magnetic circuit element 52 (soft magnetic material, magnet), and the support portion 55 (metal). For this reason, even if the relative position of the vibration member 51 and the magnetic circuit element 52 changes, for example, the force applied from the damper 53 to the vibration member 51 becomes very small only by the deformation of the damper 53. For this reason, almost no load other than the vibration member 51 is applied to the soundboard 7. In addition, about the aspect in which the support part 55 supports the magnetic circuit element 52, if the load other than the vibration member 51 is not applied with respect to the sound board 7, what kind of aspect may be sufficient.
- FIG. 12 is a diagram illustrating an example of a state in which the soundboard 7 is displaced with respect to the support portion 55.
- the soundboard 7 is shifted by a length L5 in the width direction A4 of the piece 6 with respect to the support portion 55.
- the outer peripheral surface of the bobbin 511 is only supported by the damper 53 except for the portion where the spacer 516 is connected to the soundboard 7 (specifically, the upper surface 516 ⁇ / b> A).
- the vibration member 51 rotates about the axis passing through the center P1 of the portion supported by the damper 53 and orthogonal to the width direction A4. Will do.
- the upper end portion of the shaft 514 is slightly inclined, but the spacer 516 is formed of resin, and is deformed in accordance with this inclination.
- the distance between the top surface 516A moving in the width direction A4 by L5 and the center P1 is L6, and the distance between the center P1 and the center in the axial direction A2 of the voice coil 513 is L7. Since the length of the shaft 514 is included in the distance L6, it is longer than L7.
- L8 L5 / L6 ⁇ L7. Since L6> L7 as described above, L8 ⁇ L5. As described above, in the vibration device 50 according to this embodiment, even if the soundboard 7 and the support portion 55 are displaced in the width direction A4, the width direction A4 of the voice coil 513 is larger than the magnitude of the displacement. The size of the deviation becomes smaller.
- FIG. 13 is a diagram illustrating a state in which the vibrating device 50 is attached at a position where the sounding rod 75 comes to the upper side of the top plate 521.
- a sounding rod 75 is provided on the surface of the soundboard 7 to which the spacer 516 is connected, that is, the lower surface 7B.
- the distance between the lower surface 7B and the upper surface 521A of the top plate 521 that is, the height from the upper surface 521A of the upper surface 516A of the spacer 516 connected to the soundboard 7 is L9, and from the soundboard 7 (lower surface 7B).
- the height of the sounding bar 75 is L10.
- the distance L9, the height L10, and the height L2 from the upper surface 521A to the end of the bobbin 511 have a relationship of L9> L10> L2. That is, the connecting member, that is, the cap 512, the shaft, the nut 515, and the spacer 516 described above has a distance (in this case, L9) from the magnetic circuit element 52 on the upper surface 516A, as shown in FIG.
- the upper surface 516A is fixed to the bobbin 511 so as to be longer than the distance (L10) from the plate 7.
- the entire length of the connecting member can be adjusted and fixed so that the distance between the connecting end portion and the bobbin 511 is longer than the distance from the sound board 7 of the sound bar 75.
- the vibration device may be configured such that the bobbin 511 is directly connected to the soundboard 7, and in this case, the height of the bobbin 511 from the upper surface 521A, that is, the distance between the upper surface 521A and the lower surface 7B is L2.
- the sounding rod 75 with the height L10 cannot contact the top plate 521 to attach the vibration device.
- the contact end portion of the vibration member 51 moves as described above, so that the sounding rod 75 can be attached to the soundboard 7 and the support portion 55 without contacting the top plate 521.
- FIG. 14 is a block diagram illustrating a configuration of the control device 10.
- the control device 10 includes a control unit 11, a storage unit 12, an operation panel 13, a communication unit 14, a signal generation unit 15, and an interface 16. Each of these components is connected via a bus.
- the control unit 11 includes a calculation device such as a CPU (Central Processing Unit), and a storage device such as a ROM (Read Only Memory) and a RAM (Random Access Memory).
- the control unit 11 controls each unit connected to each unit of the control device 10 and the interface 16 based on a control program stored in the recording device. In this example, the control unit 11 causes the control device 10 and a part of the configuration connected to the control device 10 to function as the musical instrument of the present invention by executing the control program.
- the storage unit 12 stores setting information indicating various setting contents used when executing the control program.
- the setting information is, for example, for determining the content of the drive signal (audio waveform signal) generated from the signal generator 15 based on detection signals output from the key sensor 22, the pedal sensor 23, and the hammer sensor 24. Information.
- the setting information also includes information indicating a sound generation mode, a performance mode, and the like set by the user.
- the operation panel 13 has operation buttons for receiving user operations. When a user's operation is accepted by this operation button, an operation signal corresponding to the operation is output to the control unit 11.
- the touch panel 60 connected to the interface 16 has a display screen such as a liquid crystal display, and a touch sensor that receives a user operation is provided on a surface portion of the display screen.
- This display screen includes a setting change screen for changing the content of the setting information stored in the storage unit 12 under control via the interface 16 of the control unit 11, a setting screen for setting various modes, a score, and the like. Various information is displayed.
- an operation signal corresponding to the operation is output to the control unit 11 via the interface 16.
- An instruction from the user to the control device 10 is input by an operation accepted by the operation panel 13 and the touch panel 60.
- the communication unit 14 is an interface that communicates with other devices by wireless, wired, or the like.
- the interface may be connected to a disk drive that reads various data recorded on a recording medium such as a DVD (Digital Versatile Disk) or a CD (Compact Disk) and outputs the read data.
- Data input to the control device 10 via the communication unit 14 is, for example, music data used for automatic performance.
- the signal generation unit 15 includes a sound source unit 151 that outputs an acoustic signal (audio waveform signal), an equalizer (EQ) unit 152 that adjusts frequency characteristics of the acoustic signal, and an amplification unit 153 that amplifies the acoustic signal (FIG. 15). reference).
- the signal generation unit 15 outputs an acoustic signal amplified by adjusting the frequency characteristic as a drive signal.
- the interface 16 is an interface that connects the control device 10 and each external component.
- the components connected to the interface 16 are a key sensor 22, a pedal sensor 23, a hammer sensor 24, a key drive unit 30, a stopper 40, a vibration generator 50, and a touch panel 60.
- the interface 16 outputs a detection signal output from the key sensor 22, the pedal sensor 23, the hammer sensor 24 and an operation signal output from the touch panel 60 to the control unit 11.
- the interface 16 outputs the control signal output from the control unit 11 to the key drive unit 30 and outputs the drive signal output from the signal generation unit 15 to the vibration device 50.
- FIG. 15 is a block diagram showing a functional configuration of the grand piano 1.
- the hammer 4 strikes the string 5 and the string 5 vibrates. This vibration is transmitted to the soundboard 7 through the piece 6.
- the damper 8 is operated by the operation of the key 2 and the operation of the pedal 3.
- the vibration suppression state of the string 5 is changed by the operation of the damper 8.
- the setting unit 110 is realized by the touch panel 60 and the control unit 11 as a configuration having the following functions.
- the touch panel 60 receives a user operation for setting a sound generation mode.
- the control unit 11 changes the setting information according to the performance mode and the sound generation mode set by the user, and selects the selected sound generation mode for the performance information generation unit 120 and the blocking control unit 130 according to these modes.
- the control signal shown is output.
- the touch panel 60 accepts a user operation for setting various control parameters in the signal generator 15.
- the various control parameters are parameters for determining the tone color of the musical tone indicated by the acoustic signal (audio waveform signal) output from the sound source unit 151, the frequency characteristic adjustment mode in the equalizer unit 152, the amplification factor in the amplification unit 153, and the like. is there.
- the user may set each control parameter individually, or select and control one preset data from the storage unit 12 in which a plurality of preset data in which the value of each control parameter is determined in advance is stored. A parameter may be set.
- the control unit 11 changes the setting information according to various control parameters set by the user, and controls the drive signal output from the signal generation unit 15 by using these control parameters.
- the equalizer unit 152 and the amplification unit 153 need not be configured so that predetermined parameters are set and can be changed by the control unit 11.
- the performance information generating unit 120 is realized by the control unit 11, the key sensor 22, the pedal sensor 23, and the hammer sensor 24 as a configuration having the following functions.
- the key sensor 22, the pedal sensor 23, and the hammer sensor 24 detect the behavior of the key 2, the pedal 3, and the hammer 4, respectively. Based on the detection signals that are output as a result, the control unit 11 controls the string 5 by the hammer 4.
- the sound source unit includes the hit timing (key-on timing), the number of the key 2 corresponding to the hit string 5 (key number), the hit speed (velocity), and the vibration suppression timing (key-off timing) of the damper 8 with respect to the string 5. It is specified as information (performance information) used in 151.
- control unit 11 specifies the hit timing and the number of the key 2 from the behavior of the key 2, specifies the hitting speed from the behavior of the hammer 4, and sets the hitting speed and the key 3 to the vibration suppression timing. It is specified from the behavior.
- the hitting timing may be specified from the behavior of the hammer 4, and the hitting speed may be specified from the behavior of the key 2.
- the performance information may be indicated by, for example, control parameters in the MIDI (Musical Instrument Digital Interface) format.
- the control unit 11 outputs performance information indicating the key number, velocity, and key-on to the sound source unit 151 of the signal generation unit 15 at the specified key-on timing. In addition, the control unit 11 outputs performance information indicating the key number and the key-off to the sound source unit 151 at the key-off timing.
- the control unit 11 realizes the above function when the sound generation mode set by the user is the weak sound mode or the strong sound mode. On the other hand, when the sound generation mode is the normal sound generation mode, in this example, the control unit 11 The output to the unit 151 is not performed.
- the control unit 11 may control so that the drive signal is not generated / output.
- the performance information generation unit 120 and the signal generation unit 15 cooperate to generate a drive signal representing a sound corresponding to the operation of the performance operator composed of the key 2 and the pedal 3 as a vibration device 50 that is an actuator. It functions as an output means for outputting to.
- the blocking control unit 130 is realized by the control unit 11 as a configuration having the following functions.
- the control unit 11 moves the stopper 40 to a position that prevents the hammer 4 from striking the string 5 while setting the normal sound generation mode or the strong sound mode.
- the stopper 40 is moved to a position that does not prevent the hammer 4 from striking the string 5.
- the sound source unit 151 outputs an acoustic signal (audio waveform signal) based on the performance information generated from the performance information generation unit 120 (control unit 11). For example, the sound source unit 151 outputs an acoustic signal (audio waveform signal) so as to have a pitch corresponding to the key number and a volume corresponding to the velocity.
- the frequency characteristic of the acoustic signal (audio waveform signal) is adjusted by the equalizer unit 152, amplified by the amplification unit 153, and supplied to the vibration exciter 50 as a drive signal.
- the vibration device 50 vibrates according to the supplied drive signal and vibrates the soundboard 7.
- the vibration of the soundboard 7 is transmitted to the piece 6 and is also transmitted to the string 5 through the piece 6.
- an audio waveform signal is generated at a pitch (frequency) corresponding to the key number of a performance-operated key
- the vibration sound from the soundboard 7 that vibrates in accordance with this audio waveform signal (drive signal)
- the pitch corresponds to the pitch of the key that has been operated.
- velocity control of vibration sound from the soundboard 7 volume control according to key touch
- the frequency of the audio waveform signal (drive signal) is not limited to this example, and various changes can be made.
- a sound signal such as a chord may be generated by mixing a plurality of pitch audio waveform signals, and the soundboard 7 may be vibrated using this signal as a drive signal.
- the fixing jig may have a shape different from that of the fixing jig 54 described above, and may not have a function capable of automatically positioning in a desired positional relationship. That is, when the fixing jig is attached to the top plate 521, the height of the upper end of the bobbin 511 from the top surface 521A of the top plate 521 is L2 (the voice coil in the magnetic path space). 513 is arranged at a predetermined mounting reference position), that is, whether the voice coil 513 is in a desired positional relationship with respect to the magnetic path space 525 automatically or by an operator. As long as it functions as a reference position indicating member to be shown, any shape may be used.
- FIG. 16 is a view showing a state in which the fixing jig 54q according to this modification is attached to the magnetic circuit element 52.
- the fixing jig 54q does not have an automatic positioning function like the fixing jig 54, and a reference position for indicating whether or not the voice coil 513 has a desired positional relationship with respect to the magnetic path space 525. The function is presented so that the operator can visually confirm.
- the fixing jig 54q has a shape in which the inner side is eliminated from the lower surface 54B of the fixing jig 54 shown in FIG. In FIG.
- the fixing jig 54 q is attached at a position where the lower surface 54 Bq is in contact with the upper surface 521 A of the top plate 521 and is not in contact with the damper 53. That is, the fixing jig 54q may be attached to the magnetic circuit element 52.
- the operator moves the shaft 514 until the upper surface 516A (connection end portion) of the spacer 516 contacts the soundboard 7, thereby fixing the fixing jig.
- the length of the shaft 514 is adjusted while visually confirming that the upper end of the bobbin 511 comes to a position along the upper surface 54Aq of 54q.
- the operator places the upper surface 516A on the soundboard so that the coil length center and the magnetic path width center substantially coincide, that is, the relative position between the vibrating member 51 and the magnetic circuit element 52 has a desired relationship. 7 (step S14).
- the height of the fixing jig from the upper surface 521A when attached is not necessarily L2, and may be, for example, the height from the top plate 521 (upper surface 521A) of the upper surface 512A of the cap 512.
- a mark may be provided somewhere on the vibration member 51 and the height of the mark from the upper surface 521A may be set.
- the height from the upper surface 521A of the fixing jig may be anything that can be used as a guideline for visually confirming the position of the vibration member 51 when the coil length center and the magnetic path width center substantially coincide.
- FIG. 17 is a diagram showing a magnetic circuit element 52r according to this modification.
- the top plate 521r included in the magnetic circuit element 52r has an upper surface 521Ar and a protrusion 521E whose height from the upper surface 521Ar is L2 on the upper surface 521Ar.
- the magnetic circuit element 52r indicates whether or not the voice coil 513 is in a desired position with respect to the magnetic path space 525, and indicates a protrusion that indicates a relative position with respect to the vibration member 51. 521E. That is, the protrusion 521E is a reference position indicating member that indicates a reference for visually confirming whether or not the relative position in the axial direction of the bobbin 511 between the voice coil 513 and the magnetic path space 525 has a desired relationship. It is. Thereby, the operator can adjust the position of the vibrating member 51 with respect to the magnetic circuit element 52 while visually confirming that the coil length center and the magnetic path width center substantially coincide.
- the magnetic circuit element 52 may be supported by the support portion 55 by a method different from the above-described embodiment.
- a hole penetrating from the upper surface to the lower surface may be provided in the yoke 523 and supported by the support portion 55 by the support rod 551 and the plurality of nuts 552.
- the magnetic circuit element 52 is not in contact with the support portion 55 in FIG. 9, but may be supported in a state of being in contact with the support portion 55.
- the support part 55 was being fixed to the housing
- FIG. 18 is a diagram illustrating a vibration device 50 s according to this modification.
- a thermal sensor 56 is attached to the vibration member 51 provided in the vibration excitation device 50s.
- the thermal sensor 56 is temperature measuring means that is attached so as to contact the upper surface 512A of the cap 512 and measures the temperature of the upper surface 512A.
- the heat sensor 56 In order to measure the heat generation from the voice coil 513, it is desirable to bring the heat sensor 56 into contact with a place where the heat is easily transmitted.
- the bobbin 511 is in direct contact with the voice coil 513, and is the member that is most likely to transmit heat among the members of the vibration exciter 50.
- the bobbin 511 is a cylindrical member and the place where the heat sensor 56 is attached is a curved surface, it is difficult to attach the heat sensor 56.
- the top plates 521 and 523 are closest to the voice coil 513 at the portion facing the magnetic path space 525, but the space is sandwiched therebetween, so that heat is not sufficiently transmitted. Further, since heat is not sufficiently transmitted through the damper 53, it has been experimentally found that even if the thermal sensor 56 is attached to the top plates 521 and 523, only a value far from the temperature of the voice coil 513 is measured. Yes.
- the upper surface 512 ⁇ / b> A of the cap 512 is a flat surface and has an area necessary for attaching the heat sensor 56, so that the heat sensor 56 can be attached more easily than the bobbin 511.
- the cap 512 is made of an aluminum material, and has a higher thermal conductivity at a temperature of 25 ° C. than a resin such as iron or polyethylene. Therefore, the cap 512 can easily transmit heat and can measure a value close to the temperature of the voice coil 513 as compared with the case where the cap 512 is formed of these materials.
- the thermal sensor 56 may be attached to the lower surface of the cap 512.
- the wiring connected to the thermal sensor 56 When the wiring connected to the thermal sensor 56 is passed between the bobbin 511 and the yoke 523, the wiring contacts the yoke 523, or a force is generated by the magnetic force of the magnetic path space 525 and the current flowing through the wiring, and is applied to the soundboard 7. Power may change. Therefore, by arranging the wiring connected to the heat sensor 56 through the hole penetrating to the upper surface 512A provided in the cap 512, the wiring can be prevented from passing between the bobbin 511 and the yoke 523.
- the thermal sensor 56 attached to the cap 512 supplies data representing the measured temperature to the control unit 11 shown in FIG.
- the control unit 11 outputs a drive signal output from the signal generation unit 15 such that the heat generated from the voice coil 513 is reduced.
- the signal generator 15 is controlled so as to obtain a drive signal that reduces the current flowing through the voice coil 513.
- the control unit 11 may control the signal generation unit 15 so that the heat generated from the voice coil 513 is reduced stepwise by changing the drive signal stepwise.
- the cap 512 may have a shape that facilitates heat dissipation. Heat generated by the voice coil 513 is radiated to the air via the top plates 521 and 523 or the bobbin 511. When passing through the top plates 521 and 523, these yokes can radiate a lot of heat because they have a larger surface area than the bobbins 511, but are separated from the voice coil 513 by air. Therefore, the amount of heat that is transmitted is small. On the other hand, compared with these yokes, the bobbin 511 is in direct contact with the voice coil 513 and thus has a large amount of heat transferred, but since the area in contact with the air is small, less heat can be released.
- the cap 512 since the heat transmitted to the bobbin 511 is also transmitted to the cap 512, it is radiated to the air from there. Therefore, when it is necessary to increase heat dissipation, the cap 512 may have a shape that easily dissipates heat.
- FIG. 19 is a view showing an example of a cap according to this modification.
- the cap 512t is made of an aluminum material and has a plurality of fins 512E on the upper surface 512At.
- the fin 512E is a portion protruding above the upper surface 512At.
- the cap 512t has a larger surface area than the cap 512 according to the above-described embodiment due to the fins 512E. Therefore, the cap 512t is easier to dissipate heat than the cap 512 does not have fins.
- the cap is not limited to the one having fins, but may be any shape that can easily radiate heat.
- the heat transmitted from the voice coil 513 is also transmitted to the shaft 514 and the nut 515, if it is necessary to increase the heat dissipation, the heat can be dissipated as long as it can be rotated and moved. It is good also as a shape which is easy to do.
- the vibration member 51 may not have this.
- the upper surface of the shaft 514 is directly connected to the soundboard 7.
- the bobbin 511, the cap 512, and the shaft 514 are all formed of an aluminum material. In this case, if the vibration member 51 is connected to the soundboard 7 without the spacer 516, the heat generated from the voice coil 513 is transmitted to the soundboard 7 more than the case where the vibration member 51 is connected.
- 7 is formed of wood as in the above-described embodiment, the soundboard 7 is more affected by heat.
- the spacer 516 may not be interposed.
- the energy loss is smaller than the case where the spacer 516 is sandwiched between the shaft 514 and the soundboard 7 because the spacer 516 which is resin is not interposed, and the force applied to the soundboard 7 by the vibration of the vibration member 51. Becomes larger.
- the bobbin 511, the cap 512, the shaft 514, the nut 515, and the spacer 516 may be formed of a material different from the above-described embodiment.
- the bobbin 511, the cap 512, and the shaft 514 are formed using an aluminum metal as a material, copper or the like may be used as a material, or resin or plastic may be used as a material. Whatever material is used, it is sufficient that the material satisfies the conditions required for a voice coil actuator, such as strength, weight, non-magnetic material, heat resistance, and the like.
- the shaft 514 may have a shape different from that of the above-described embodiment.
- FIG. 20 is a diagram illustrating an appearance of a shaft 514u that is an example of a shaft according to the present modification.
- the shaft 514u includes a tubular member 514u1, a stretching member 514u2 extending in the axial direction A2, and a bolt 514u3.
- the extending member 514u2 has a columnar part formed in a columnar shape having a diameter smaller than the inner diameter of the tubular member 514u1, and a male threaded part in which a male thread continuous to the middle part is cut.
- the extending member 514u2 is fixed using a nut in a state where the male screw portion is screwed into the hole portion 512G of the cap 512.
- the cylindrical portion of the extending member 514u2 has one hole penetrating in the direction orthogonal to the axial direction A2.
- the tubular member 514u1 has one end in the axial direction A2 fixed to the spacer 516 with an adhesive or the like. Further, the tubular member 514u1 has a plurality of holes (for example, four locations) through which the whole member extends in a direction orthogonal to the axial direction A2 at different positions in the axial direction A2.
- the plurality of holes vacated in the tubular member 514u1 and the extending member 514u2 are internally threaded so that bolts 514u3 can be screwed therein.
- the portion of the bolt 514u3 where the male screw is cut is longer than the outer diameter of the tubular member 514u1, and penetrates the tubular member 514u1.
- the cylindrical portion of the extending member 514u2 is inserted inside the tubular member 514u1, and one of the holes vacated in the tubular member 514u1 and the holes vacated in the cylindrical portion are aligned in these holes.
- the bolt 514u3 is screwed. Thereby, the extending member 514u2 and the tubular member 514u1 are fixed.
- the shaft 514u can change the height from the cap 512 in a plurality of steps (for example, four steps) by changing the hole on the tubular member 514u1 side into which the bolt 514u3 is screwed.
- FIG. 21 is a diagram illustrating an appearance of a shaft 514v that is an example of a shaft according to the present modification.
- the shaft 514v includes a tubular member 514v1, a stretching member 514v2 extending in the axial direction A2, and two bolts 514v3.
- the tubular member 514v1 has the exception that the hole penetrating the entire member in the direction orthogonal to the axial direction A2 is vacant in one place instead of four places, that is, only two holes facing in that direction are vacant.
- the tubular member 514u1 is common.
- the extending member 514v2 is common to the extending member 514u2 except that the cylindrical portion has no hole.
- the portion of the bolt 514v3 where the male screw is cut has a length that allows the tip of the bolt 514v3 to reach the cylindrical portion of the extending member 514v2 when screwed through the hole of the tubular member 514v1.
- two bolts 514v3 are respectively screwed into two holes of the tubular member 514v1 in a state where the cylindrical portion of the extending member 514u2 is inserted inside the tubular member 514u1, and each tip is pressed against the cylindrical portion.
- the shaft 514v can change the height from the cap 512 continuously by changing the position where each tip of the two bolts 514v3 is pressed against the cylindrical portion.
- the vibration member having the shaft has a predetermined distance from the bobbin 511 to the upper surface 516A of the spacer 516.
- the connection end is fixed to the bobbin 511.
- the above-described connecting members that is, the cap 512, the shaft, the nut 515, and the spacer 516 can adjust the voice coil 513 provided on the bobbin 511 to a predetermined position in the magnetic path space 525 as shown in FIG.
- the entire length is adjusted and fixed so that the connection end is connected to the soundboard 7.
- the shaft may have any shape as long as the connecting member including the shaft can be fixed by adjusting the overall length as described above.
- a position where the lower end of the shaft 514 is above the lower end of the hole 512G may be determined. Even in this case, the connection end of the connection member is connected to the soundboard 7 while the voice coil 513 provided on the bobbin 511 is adjusted to a predetermined position in the magnetic path space 525. As long as the entire length is adjusted and fixed, it is sufficient. In this case, matching with the predetermined position means that the voice coil 513 and the top plate 521 have a predetermined positional relationship, for example, the voice coil 513 is opposed to the top plate 521.
- step S ⁇ b> 11 may be performed after other work (steps S ⁇ b> 12 and S ⁇ b> 13) as long as the work is performed before the work of step S ⁇ b> 14.
- the fixing jig 54 moves the shaft 514 and connects the spacer 516 to the soundboard 7 in step S14, the relative positional relationship of the vibration member 51 with respect to the magnetic circuit element 52 is such that the coil length center and the magnetic path. It is only necessary to be attached so that it can be confirmed automatically or visually that the width centers are substantially coincident.
- the damper 53 may be omitted from the vibration device 50.
- the processes of steps S13 and S14 in FIG. The assembly of the vibration member 51 is first attached to the information fixed position of the soundboard 7. Then, the process of step S ⁇ b> 12 is performed, and the magnetic circuit element 52 is installed on the support portion 55 so that the bobbin 511 provided with the voice coil 513 is properly contained in the magnetic path space of the magnetic circuit element 52.
- step S14 the process of step S14 is performed, and the length of the shaft 514 is adjusted so that the relative positional relationship of the vibration member 51 with respect to the magnetic circuit element 52 is in a state where the coil length center and the magnetic path width center are substantially coincident. .
- FIG. 22 is a diagram for explaining the appearance of the vibration device 50A according to the second embodiment of the present invention.
- the vibration device 50A according to the second embodiment does not include the mounting shaft 514 that the vibration device 50 according to the first embodiment has.
- the vibration device 50A according to the second embodiment is different from the vibration device 50 according to the first embodiment described above in that the structure for attaching the vibration device 50A to the soundboard 7 is different.
- the structure for performing the original function may be the same. Accordingly, in the following description and drawings related to the second embodiment, the same reference numerals as those in the first embodiment indicate the same function and / or parts having the same function, and thus detailed description thereof is omitted. To do.
- the vibration unit 51 of the vibration excitation device 50 ⁇ / b> A includes a bobbin 511 and a cap 512.
- the cap 512 is a disc-shaped end member attached to the tip of the bobbin 511.
- the upper surface 512 ⁇ / b> A of the cap 512 which is an end member is a “connection end” connected to the soundboard 7.
- FIG. 23 is a longitudinal sectional view of the vibration device 50A shown in FIG.
- the vibration device 50A according to the second embodiment is different from the vibration device 50 according to the first embodiment shown in FIG. 5 in that it includes mounting parts denoted by reference numerals 514, 515, and 516 in FIG. There is no point, the point that the female screw is not cut in the hole 512G ′ in the center of the cap 512 of the bobbin 511, the point that the material of the cap 512 and the through hole 523G are provided in the disk part 523E and the column part 523F of the yoke 523. It is.
- Other structures in FIG. 23 are substantially the same as those shown in FIG.
- the cap 512 in the second embodiment shown in FIGS. 22, 23, etc. is made of a material such as resin, and is fixed to a portion (opening) that opens above the bobbin 511. Is blocking.
- the cap 512 has a hole 512G ′ that passes through the centers of the upper and lower portions.
- the axis B1 of the hole 512G ′ overlaps the axis B2 of the bobbin 511.
- the yoke 523 has a through hole 523G that penetrates both the disk portion 523E and the cylindrical portion 523F in the axial direction A3. That is, the through hole 523G penetrates the magnetic circuit element 52 in the axial direction A3.
- the through hole 523G has an inner diameter size that allows passage of a wood screw (fixing member) 61 for connecting the cap (end member) 512 to the soundboard 7.
- the hole 512G ′ of the cap 512 is provided at a position corresponding to the through-hole 523G of the yoke 523 so that the axes coincide with each other.
- the hole 512G ′ is a hole through which the screw portion of the wood screw (fixing member) 61 is passed.
- the wood screw (fixing member) 61 is attached to the surface of the cap (end member) 512 facing the through hole 523G. It functions as a mark for specifying the position to be.
- FIG. 24 is a flowchart showing a procedure for attaching the vibration device 50A.
- the support portion 55 is attached to a predetermined portion (for example, the straight column 9) of this piano. Similar to FIG. 6, the procedure shown in FIG. 24 is started with the support portion 55 connected to the straight support 9. The operator attaches the fixing jig to the magnetic circuit element 52 (step S21). Also in the second embodiment, the same fixture 54 (FIG. 7) used in the first embodiment can be used.
- FIG. 25 is a diagram showing a state where the position and orientation of the vibrating member 51 relative to the magnetic circuit element 52 are restricted by the fixing jig 54.
- the fixing jig 54 is installed with the lower surface 54B in contact with the upper surface 521A of the top plate 521, and is fixed to the upper surface 521A by the attractive force (magnetic attractive force) from the top plate 521. Is done.
- the fixing jig 54 is attached so that the bobbin 511 may be inserted
- Step S22 the operator brings the cap 512 into contact with a predetermined position of the soundboard 7 (step S22).
- This position is determined in advance as a position where the vibration device 50A applies vibration to the soundboard 7, and is, for example, a position on the opposite side of the piece 6H or piece 6L and the soundboard 7 in FIG.
- an operator makes the support part 55 support the magnetic circuit element 52 (step S23).
- Step S23 is an example of the “support step” according to the present invention.
- FIG. 26 is a diagram showing a state in which the magnetic circuit element 52 is supported by the support portion 55.
- the positions of the soundboard 7, the piece 6, and the support portion 55 are indicated by two-dot chain lines in order to show the positional relationship between the vibration device 50 ⁇ / b> A, the soundboard 7, the piece 6, and the support portion 55.
- FIG. 26 shows a state in which the width direction A4 of the piece 6 is viewed in the horizontal direction of the drawing.
- the piece 6 is provided on the upper surface 7 ⁇ / b> A of the soundboard 7.
- the excitation area C1 is predetermined on the lower surface 7B of the soundboard 7.
- the support portion 55 is provided with an appropriate opening 55a so that the driver 62 held in the operator's hand can be inserted upward from below during the attachment operation.
- the top plate 521 has a hole (not shown) penetrating from the upper side to the lower side, and a female screw is cut inside the hole.
- the support portion 55 is provided with a hole penetrating from the upper side to the lower side, and a female screw is also cut inside the hole.
- the magnetic circuit element 52 is fixed to the support portion 55 by a combination of a plurality of support rods 551 having male threads cut at both ends and a plurality of nuts 552 screwed thereto.
- the load of the magnetic circuit element 52 supported by the support portion 55 is applied to the straight column 9 via the support portion 55.
- the vibration member 51 When the operator performs the work of step S23, the vibration member 51 is positioned at the position where the lower surface 512B of the cap 512 is in contact with the upper surface 54A of the fixing jig 54, that is, the coil length center and the magnetic field, as described above.
- the center of the road width is prevented from moving below the position where it overlaps (substantially matches). For this reason, the operator prevents the gap between the lower surface 512B and the upper surface 54A so that the relative position of the vibration member 51 with respect to the magnetic circuit 52 in the normal direction A1 is in a desired relationship.
- the magnetic circuit element 52 can be supported by the support portion 55.
- step S24 the operator removes the fixing jig 54 (step S24). Then, the operator moves a fixing member (for example, a wood screw) for fixing the cap 512 to the soundboard 7 to a position where the fixing member is attached to the cap 512 (step S25). The cap 512 is fixed to the soundboard 7 by attaching a fixing member (step S26).
- Step S25 is an example of a “moving step” according to the present invention
- step S26 is an example of a “fixed step” according to the present invention. Details of the work performed by the workers in steps S25 and S26 will be described with reference to FIG.
- FIG. 27 is a diagram showing a state in which the cap 512 is fixed to the soundboard 7.
- the cap 512 is fixed to the soundboard 7 by a wood screw 61 which is a fixing member attached to the hole 512G and the soundboard 7.
- the wood screw 61 is made of a non-magnetic metal such as brass or stainless steel, and the diameter of the head is larger than the diameter of the hole 512G of the cap 512.
- the non-magnetic material means an object that is not a ferromagnetic material.
- the wood screw 61 is screwed into the soundboard 7 and the piece 6 through the hole 512G.
- the cap 512 is fixed to the soundboard 7 by being pressed against the soundboard 7 by the head of the wood screw 61.
- the diameter of the portion of the wood screw 61 where the male screw is cut (referred to as the root of the wood screw 61) coincides with the diameter of the hole 512G.
- the root of the wood screw 61 is exactly contained in the lower opening of the hole 512G. That is, the position where the cap 512 is fixed is determined at one place with respect to the position where the wood screw 61 is screwed.
- the screwdriver 62 is made of a non-magnetic metal such as brass or stainless steel, and the shape of the tip corresponds to the shape of the screw hole of the wood screw 61. For example, if the screw hole is positive, the shape is positive. If the screw hole is negative, the shape is negative.
- step S25 the worker performs work using the driver 62. The operator inserts the wood screw 61 into the tip of the driver 62 and inserts the tip of the driver 62 into the hole 523G that penetrates the yoke 523. In a state before the wood screw 61 shown in FIG.
- the axis B2 of the bobbin 511 and the axis B3 of the yoke 523 substantially overlap (substantially match) due to the connection by the damper 53. It is in a state. For this reason, the axis of the hole 512G of the cap 512 substantially coincides with the axis of the hole 523G.
- the operator moves the wood screw 61 using the driver 62 until the wood screw 61 inserted into the hole 523G passes through the hole 523G and reaches the hole 512G.
- the worker rotates the driver 62 to screw the wood screw 61 into the soundboard 7.
- the driver 62 rotates while pressing the wood screw 61
- the driver 62 and the wood screw 61 are substantially in a straight line. Therefore, the wood screw 61 is attached to the hole 512G and the soundboard 7 while maintaining the state where the hole 512G is positioned in the axial direction A3 of the hole 523G.
- the position where the cap 512 is fixed is determined at one place with respect to the position where the wood screw 61 is screwed in, for example, when the work of step S25 is started, Even if the axis B1 and the axis B3 are misaligned, the root of the wood screw 61 just fits in the lower opening of the hole 512G as the wood screw 61 is screwed into the soundboard 7. As a result, the hole 512G and the hole 523G are aligned, and the axis B1 of the hole 512G and the axis B3 of the yoke 523 overlap. As described above, the axis B1 overlaps the axis B2 of the bobbin 511.
- the bobbin 511 and the yoke 523 are in an axially aligned state by the operator performing the operation of step S25. Thereby, the operator can attach the vibration device 50A so that the bobbin 511 and the yoke 523 do not come into contact with each other, and when the vibration member 51 vibrates, the axis alignment is not performed. The bobbin 511 is less likely to contact the yoke 523.
- both the object and the device for moving the object When moving an object until the object passes through the hole 523G and reaches the hole 512G, both the object and the device for moving the object must pass through the magnetic path formed by the magnetic circuit element 52. become.
- the object and instrument are magnetic bodies, it is attracted to the yoke 523 by the attractive force generated by this magnetic path, and it becomes difficult to move.
- the wood screw 61 and the driver 62 are both non-magnetic materials as described above, and the force received by the magnetic force of the magnetic path when passing through both holes is small enough to be ignored. For this reason, the operator can perform the operation of step S25 without worrying about the force that the wood screw 61 and the driver 62 receive from the magnetic path.
- the cap 512 is fixed to the soundboard 7 as shown in FIG. Accordingly, the soundboard 7 is pushed upward when the bobbin 511 moves upward, and is pulled downward by the bobbin 511 instead of leaving the bobbin 511 when the bobbin 511 moves downward. become. In this way, the vibration in the bobbin 511 is applied to the piece 6 via the soundboard 7 and further transmitted to the string 5.
- the bobbin 511 and the cap 512 are an example of a “bobbin portion” according to the present invention, and the wood screw 61 is an example of a “fixing member” according to the present invention.
- the cap 512 covers one end portion of the bobbin portion, and is an example of the “lid portion” according to the present invention.
- one end of the bobbin portion in the axial direction A2 is fixed to the soundboard 7 by a nonmagnetic fixing member.
- the magnetic circuit element 52 functions as a magnetic path forming portion that forms a magnetic path space 525 between the inner peripheral surface 511C and the outer peripheral surface 511D of the bobbin portion shown in FIG.
- the hole 523G included in the yoke 523 of the magnetic circuit element 52 is an example of the “hole” according to the present invention. As shown in FIG. 23, the hole 523G penetrates the magnetic path forming portion in the axial direction A3, and one end portion opens from the cylindrical portion 523F to the space inside the bobbin portion.
- the cylindrical portion 523F is a portion disposed inside the bobbin portion of the magnetic path forming portion.
- the axial direction A3 is an example of the “first direction” according to the present invention.
- the hole 523G has a size through which the wood screw 61 passes, as described in step S25 of FIG.
- the bobbin portion (strictly, the cap 512) has a hole 512G penetrating in the axial direction A3.
- the hole 512G also indicates a position where the wood screw 61 is attached, and is an example of the “instruction area” according to the present invention. As shown in FIG. 10, when the hole 512G is positioned in the axial direction A3 of the hole 523G, the bobbin portion and the magnetic path forming means are not in contact with each other.
- the magnetic circuit element 52 Since the magnetic circuit element 52 is supported by the support portion 55 and its position is fixed, most of the driving force generated by the voice coil 513 is used as thrust for vibration of the bobbin 511. Further, the magnetic circuit element 52 is supported by the support portion 55 so as not to come into contact with the soundboard 7 and in a positional relationship separated from the vibration member 51 by the space. Further, since the vibration member 51 is separated from the magnetic circuit element 52 by the space, the vibration member 51 is supported by the soundboard 7 by being fixed to the soundboard 7.
- the vibration device 50 ⁇ / b> A is supported by the support portion 55 in such a manner, so that a load other than the vibration member 51 is not applied to the soundboard 7. As described above, the mode in which the support portion 55 supports the magnetic circuit element 52 is any mode as long as no load other than the vibration member 51 is applied to the soundboard 7. Also good.
- control system similar to the functional configuration of the control device 10 and the grand piano 1 in the first embodiment as shown in FIGS. 14 and 15 can be used.
- the cap 512 is fixed to the soundboard 7 using the wood screw 61 as a fixing member, but other caps may be used as the fixing member.
- the cap 512 may be fixed to the soundboard 7 using bolts, nuts, and nails, or may be fixed to the soundboard 7 with an adhesive.
- the central portion of the cap 512 is fixed with a wood screw or the like through the hole 512G ′, and the outer peripheral end of the upper surface 512A is fixed with an adhesive or the like.
- a force pulling downward by the bobbin 511 is also applied to the end on the outer peripheral side of the upper surface 512A.
- a washer (washer) may be used.
- a washer is disposed below the cap 512, and the wood screw 61 is screwed into the soundboard 7 through the washer and the hole 512G '.
- the wood screw 61 becomes difficult to loosen.
- FIG. 28 is a diagram illustrating a cap 512m which is an example of a cap according to the present modification.
- FIG. 28A shows a state before the cap 512m is fixed to the soundboard 7 by the wood screw 61.
- FIG. The cap 512m has a shape in which the cap 512 is deformed so as to be depressed downward as it goes from the outer peripheral side to the center side.
- FIG. 28B shows a state where the wood screw 61 is fixed to the soundboard 7 through the hole 512Gm of the cap 512m.
- the cap is fixed to the soundboard 7 using the adhesive and the wood screw 61.
- the operator places two points in the gap between the cap 512m and the soundboard 7 in the state of FIG.
- the adhesive is poured from the hole 512Gm using the tool 63 for injecting the adhesive indicated by the chain line.
- step S15 the operator presses the cap 512m against the soundboard 7 using the wood screw 61 as shown in FIG. At this time, the poured adhesive spreads between the upper surface 512 Am and the soundboard 7.
- the operator fixes the cap 512m to the soundboard 7 with the wood screw 61 and the adhesive.
- the operator can operate the cap 512m by applying the adhesive to the upper surface 512Am until step S24.
- the magnetic circuit element 52 can be supported by the support portion 55 without worrying about the exact position.
- the operator supports the magnetic circuit element 52 that is, in step S15, for example, when the instrument 63 is inserted from the side into the gap between the soundboard 7 and the upper surface 512Am and the adhesive is evenly applied to the upper surface 512Am. In comparison, the adhesive can be easily applied.
- FIG. 29 is a diagram illustrating an example of a member 512n attached to the end of the bobbin 511.
- the member 512n has an upper surface 512An.
- FIG. 29 shows the member 512n viewed from the upper surface 512An side.
- the member 512n has a hole 512Gn and a hole region 512H shaped so as to surround the periphery of the hole 512Gn.
- the inside of the bobbin 511 is in a state of opening to the outside through the hole region 512H.
- the member 512n may be fixed to the soundboard 7 with, for example, a wood screw 61 attached to the hole 512Gn and the soundboard 7 and an adhesive applied to the upper surface 512An.
- the member attached to the bobbin 511 only needs to have a hole for attaching the wood screw 61 like the cap 512 or the member 512n.
- FIG. 30 is a diagram illustrating a cap 512p which is an example of a cap according to the present modification.
- FIG. 30A shows the cap 512p before the wood screw 61 is attached.
- the cap 512p has a hole 512Gp on the lower surface 512Bp side.
- the hole 512Gp has a shape in which the lower surface 512B is recessed in a conical shape, and does not penetrate to the upper surface 512Ap. From the hole 512Gp to the upper surface 512Ap, by screwing the tip of the wood screw 61, as shown in FIG.
- the wood screw 61 can open a hole in this portion of the resin and penetrate the cap 512p. It has become. In short, if the hole of the cap functions as a mark that identifies the position where the wood screw 61 is attached, and the cap can be fixed to the soundboard 7 by attaching the wood screw 61, It does not have to penetrate.
- the cap 512m, the member 512n or the cap 512p and the bobbin 511 described above are all examples of the “bobbin portion” according to the present invention.
- the worker only touches the soundboard 7 with the upper surface 512A on the upper side of the cap 512 in step S22 of FIG. 24.
- the time required for the operations from step S23 to S25 is as follows. You may use the adhesive which takes time until it hardens to such an extent that the position which contacts the sound board 7 of 512 A of upper surfaces can be shifted until it passes. Even before the adhesive is completely hardened, for example, the force applied by the bending of the damper 53 fixes the cap 512 to such an extent that the position where the soundboard 7 and the upper surface 512A are in contact with each other is not displaced.
- the bobbin 511 and the cap 512 in the second embodiment may be formed of materials different from those described above.
- the bobbin 511 is formed using an aluminum metal as a material, but is not limited thereto, and copper or the like may be used as a material, or resin or plastic may be used as a material.
- the cap 512 is formed of a resin as a material.
- the present invention is not limited thereto, and a metal such as an aluminum material or copper, a plastic, or the like may be used as a material. Whatever material is used, it is sufficient that the material satisfies the conditions required for a voice coil actuator, such as strength, weight, non-magnetic material, heat resistance, and the like.
- the magnetic circuit element 52 may be fixed to the support portion 55 by a method different from the above-described embodiment.
- a hole penetrating from the upper surface to the lower surface may be provided in the yoke 523 and fixed to the support portion 55 by the support rod 551 and the plurality of nuts 552.
- the magnetic circuit element 52 is not in contact with the support portion 55, but may be fixed by contacting them.
- the position (height position) in the axial direction A2 of the support portion 55 is configured to be adjustable, and the relative position of the vibrating member 51 and the magnetic circuit element 52 with respect to the axial direction A2 is adjusted by adjusting the position.
- the vibration device 50 ⁇ / b> A can be attached to the soundboard 7 while maintaining an ideal (height position).
- the fixing jig may have a shape different from that of the fixing jig 54 described above, as shown in FIG.
- the same fixing jig 54q can be used.
- FIG. 31 shows an example in which the same jig as the fixing jig 54q shown in FIG. 16 is used in the second embodiment.
- the operator places the upper end of the bobbin 511 at a position along the upper surface 54Aq of the fixing jig 54q in a state where the upper surface 512A of the cap 512 is in contact with the soundboard 7.
- the magnetic circuit element 52 is supported by the support portion 55 while visually confirming so as to come. Thereby, it can set so that the relative position of the vibration member 51 and the magnetic circuit element 52 may become a desired relationship so that a coil length center and a magnetic path width center may correspond substantially.
- the fixing jig does not have to have a height L2 from the upper surface 521A when it is attached.
- the fixing jig The mark may be provided somewhere on the vibration member 51, and the height of the mark from the upper surface 521A may be set.
- the height from the upper surface 521A of the fixing jig may be anything that can be used as a guideline for visually confirming the position of the vibration member 51 when the coil length center and the magnetic path width center substantially coincide.
- FIG. 32 is a diagram showing a magnetic circuit element 52r according to this modification. That is, the top plate 521r included in the magnetic circuit element 52r has an upper surface 521Ar and a protrusion 521E having a height L2 from the upper surface 521Ar on the upper surface 521Ar. In this case, the operator supports the magnetic circuit element 52 on the support portion 55 while the upper end portion of the bobbin 511 comes to a position along the upper surface 521F of the projection portion 521E in step S23 of FIG.
- FIG. 33 is a diagram showing a vibration device 50B according to this modification.
- the vibration device 50B includes a cap 512s and a yoke 523s.
- the cap 512s has a hole 512Gs
- the yoke 523s has a hole 523Gs.
- the holes 512Gs and 523Gs are each along a direction A5 that forms an angle with respect to the axial direction A2.
- the distance between the magnetic flux line directions A6 and A7, which is the direction of magnetic flux lines between the bobbin 511 and the yoke 523 (the direction indicated by the broken line in FIG. 23), is L4.
- the hole 512Gs of the cap 512 is disposed obliquely so as to coincide with the direction A5 of the hole 523Gs.
- the hole 523Gs is an example of the “hole” according to the present invention
- the opening of the hole 512Gs that appears on the upper surface of the cap 512 is an example of the “instruction area” according to the present invention.
- the direction A5 is an example of the “first direction” according to the present invention.
- the driver 62 and the wood screw 61 shown in FIG. 27 obliquely upward through the holes 512Gs and 523Gs provided as described above, these holes are aligned in a straight line, and the cap 512s is in a state where the axis is aligned. Can be fixed to the soundboard 7.
- FIG. 34 is a diagram showing a vibrating member 51t according to this modification.
- the vibration member 51t includes a bobbin 511t and a voice coil 513.
- the bobbin 511t is formed in a shape in which the bobbin 511 and the cap 512 shown in FIG.
- the bobbin 511t has a hole 511Gt penetrating in the axial direction A2 at the upper end.
- the bobbin 511t is an example embodiment that corresponds to the “bobbin portion” according to the present invention.
- the magnetic circuit element 52 may be supported by the support portion 55 by a method different from the above-described embodiment. For example, instead of the top plate 521, a hole penetrating from the upper surface to the lower surface may be provided in the yoke 523 and supported by the support portion 55 by the support rod 551 and the plurality of nuts 552. Further, the magnetic circuit element 52 is not in contact with the support portion 55 in FIG. 26, but may be supported in a state of being in contact with the support portion 55. Moreover, although the support part 55 was being fixed to the housing
- the vibration member 51, the magnetic circuit element 52, and the damper 53 all have a circular shape when viewed in the normal direction A1 shown in FIG. 23, but are not limited thereto.
- This shape may be, for example, an ellipse or a rectangle.
- the shape may be any shape as long as the vibrating member 51 vibrates according to the waveform indicated by the drive signal input to the voice coil.
- the portion disposed inside the bobbin portion of the magnetic path forming portion such as the cylindrical portion 523F described above has a size that can be disposed so as not to contact the inside of the bobbin portion.
- the portion disposed outside the bobbin portion of the magnetic path forming portion, such as the yoke 523 described above, is sized so as not to contact the outside of the bobbin portion.
- the structure of the end member (cap 512) that is coupled to the end of the bobbin 511 and is suitable for being connected to the soundboard 7 is not limited to the flat cap as described above.
- it may be in the form of a long, hollow rod that extends upward from the tip of the bobbin 511 to some extent. In that case, the front end surface of the hollow rod is closed, and a threading hole 512G ′ is provided. Due to the hollow rod, the wood screw 61, which is a fixing member, can pass through the rod and reach the hole 512G ′ on the tip surface.
- FIG. 35 is a longitudinal sectional view of a vibration device 50C according to the third embodiment of the present invention.
- the structure of the connecting shaft 514A capable of adjusting the attachment length for attaching the vibration member 51 to the soundboard 7 is the same as the vibration device 50 according to the first embodiment. Is different from the structure of the shaft 514.
- the vibration device 50C according to the third embodiment may have the same structure as the vibration devices 50 and 50A according to the first or second embodiment in order to perform the original function as the other vibration devices. . Accordingly, in the following description and drawings related to the third embodiment, the same reference numerals as those in the first or second embodiment described above indicate the same function and / or parts having the same function. Description is omitted.
- a housing 517 made of a non-magnetic material (such as aluminum or synthetic resin) is coupled to the upper end of the bobbin 513 of the voice coil 511.
- the housing 517 has an upper opening 517a and a lower opening 517b, and includes a chuck 518 inside.
- the chuck 518 includes a male screw portion 518a and a female screw portion 518b, and the axial center portion is a through hole for passing the shaft 514A to be gripped.
- the male screw portion 518a is fixed inside the housing 517 so that the through hole of the chuck 518 coincides with the upper opening 517a of the housing 517, and the female screw portion 518b is screwed into the male screw portion 518a.
- the male threaded portion 518a has a plurality of cuts in the axial direction, and the diameter of the through-hole inside thereof is reduced in accordance with the tightening by the female threaded portion 518b.
- the shaft passed through the through hole is configured to be tightened.
- the lower opening 517b of the housing 517 has a size that is appropriately larger than the outer diameter of the chuck 518, and the chuck 518 can be inserted into the housing 517 during assembly.
- the lower opening 517b is sized to allow the driver 64 for turning the female threaded portion 518b of the chuck 518 to enter from the lower opening 517b.
- a key groove that fits the tip key portion 64a of the driver 64 is formed on the lower surface of the female screw portion 518b of the chuck 518, and the tip key portion 64a of the driver 64 is fitted in the key groove,
- the internal thread portion 518b of the chuck 518 can be turned by the driver 64.
- the connecting shaft 514A can be introduced into the housing 517 from the upper opening 517a of the housing 517.
- the shaft 514A can be freely moved, and the shaft 514A protruding upward from the upper surface of the housing 517 is set to a desired length, and then the chuck 518 is tightened to tighten the shaft 514A.
- 514A can be fixed at a desired protruding length.
- the upper end of the connecting shaft 514A is a connecting portion 514Aa, and the connecting portion 514Aa is connected to the soundboard 7 by an adhesive or the like.
- the yoke 523 has a through hole 523G ′ that penetrates both the disk portion 523E and the column portion 523F in the axial direction. Through this through hole 523G ′, a driver 64 is inserted from below to above, and the internal thread portion 518b of the chuck 518 can be turned by the driver 64.
- An example of the work for attaching the vibration device 50C according to the third embodiment to the piano 1 is as follows. First, the support portion 55 is attached to a predetermined position in the same manner as described above. Then, the connecting shaft 514 ⁇ / b> A is attached to a predetermined attachment location on the lower surface of the soundboard 7. That is, the upper end connection portion 514Aa is connected to the soundboard 7 with an adhesive or the like. Then, the vibration device 50C is installed on the support portion 55 in the same manner as described above. At the same time, the lower end of the connecting shaft 514A is inserted into the chuck 518 from the upper opening 517a of the housing 517.
- the driver 64 is inserted into the through hole 523G ′ of the yoke 523 from below to above, the tip key 64a of the driver 64 is fitted into the key groove on the lower surface of the female screw portion 518b of the chuck 518, and the driver 64 is turned.
- the chuck 518 is tightened to fix the position of the connecting shaft 514A.
- the fixing jig 54, 54q, etc.
- the bobbin 511 can be set to a predetermined mounting reference position (ideal neutral position) (distance L2 from the upper surface 521A of the top plate 521 to the upper end of the bobbin 511).
- the ideal coil arrangement can be ensured without using the fixing jig (54, 54q, etc.).
- the driver 64 is pulled out.
- Such a method of accessing from below for the tightening operation is such a lateral direction as compared with the case where the length adjustment and the tightening operation of the shaft 514 of the first embodiment are performed by access from the lateral direction. It can be advantageously applied in an environment where access from is difficult.
- the connecting shaft 514A, the housing 517 and the chuck 518 are coupled to the bobbin 511 and correspond to a connecting member configured to vibrate with the vibration of the bobbin.
- the connection member has a connection portion 514Aa (connection end portion) suitable for being connected to the soundboard 7 of the musical instrument, and the length thereof is adjustable. That is, the connecting member includes a housing 517 (first member) coupled to the bobbin 511, a connecting shaft 514A (second member) coupled to the housing 517 (first member) so as to be displaceable, and the first member.
- a chuck 518 (clamping tool) suitable for clamping and fixing the coupling portion between the one member and the second member is provided.
- FIG. 36 is a longitudinal sectional view of a vibration exciting device 50D according to the fourth embodiment of the present invention.
- the structure of the connecting shaft 514B which can be attached to the soundboard 7 to adjust the attachment length, is the same as that of the first and third embodiments. This is different from the structure of the connecting shafts 514 and 514A that the vibration devices 50 and 50C have.
- the use of the chuck 519 for adjusting the length of the shaft 514B is similar to the third embodiment, but the structure of the chuck 519 is different from that of the third embodiment.
- the same reference numerals as those in the first to third embodiments described above denote the same function and / or parts having the same function. Omitted.
- a cap 512 ′ made of a nonmagnetic material (aluminum or synthetic resin) is coupled to the upper end of the bobbin 513 of the voice coil 511.
- a male screw portion 519a of the chuck 519 is integrally coupled to the upper surface of the cap 512 ′.
- the cap 512 ′ and the male threaded portion 519a of the chuck 519 may be integrated, or may be configured by connecting separate members.
- a female screw portion 519b is screwed into a male screw portion 519a of the chuck 519.
- the axial center portion of the chuck 519 is a through hole for passing the shaft 514B to be gripped, and this through hole is also provided continuously in the cap 512 ′.
- the lower end of the shaft 514B can pass through the through hole and protrude downward appropriately from the lower surface of the cap 512 ′.
- the connecting shaft 514 ⁇ / b> B is inserted into the chuck 519 from the upper opening of the chuck 519.
- the portion near the tip of the male screw portion 519a has a plurality of cuts in the axial direction and is somewhat elastically spread outward.
- the female screw portion 519b moves upward, pressing the portion near the tip of the male screw portion 519a inward, reducing the diameter of the through hole inside thereof, and The shaft that is passed through the through hole is tightened.
- the shaft 514B In the loosened state of the chuck 519, the shaft 514B can be freely moved, and the height (length) of the shaft 514B protruding upward from the upper surface of the cap 512 ′ is set as desired, and then the chuck 519 is tightened. Thus, the shaft 514B can be fixed at a desired protruding height (length).
- the upper end of the connecting shaft 514B is a connecting portion 514Ba, and the connecting portion 514Ba is connected to the soundboard 7 by an adhesive or the like.
- An example of the work for attaching the vibration device 50D according to the fourth embodiment to the piano 1 is as follows. First, the support portion 55 is attached to a predetermined position in the same manner as described above. Then, the vibration device 50D mounted with the connecting shaft 514B with the chuck 519 loosened is installed on the support portion 55 in the same manner as described above. At this time, the connection portion 514Ba at the upper end of the shaft 514B is arranged to correspond to a predetermined attachment location on the lower surface of the soundboard 7. Then, the shaft 514B is pulled up, and the connecting portion 514Ba at the upper end is connected to the soundboard 7 with an adhesive or the like. Then, the chuck 519 is tightened to fix the position of the connecting shaft 514B.
- the fixing jig (54, 54q, etc.) may or may not be used.
- the bobbin 511 By holding the bobbin 511 with the damper 53, the bobbin 511 can be set at a predetermined mounting reference position (ideal neutral position), and thus, in particular, the fixing jig (54, 54q, etc.) is used. Therefore, an ideal coil arrangement can be ensured.
- the arrangement of the chuck 519 may be turned upside down. That is, the shape of the shaft 514B having the connection portion 514Ba at the upper end is formed into a cylindrical shape having a through hole inside, and a male screw portion 519a of the chuck 519 is formed on the lower side of the shaft 514B so as to face downward as opposed to FIG. To do. Then, a rod protrudes upward from the upper surface of the cap 512 ′, and this rod is inserted into the through hole of the chuck 519. Accordingly, the rod protruding upward from the cap 512 ′ and the shaft 514B are connected via the chuck 519, and the height position of the shaft 514B can be adjusted.
- the connecting shaft 514B, the chuck 519 and the cap 512 ′ are coupled to the bobbin 511 and correspond to a connecting member configured to vibrate with the vibration of the bobbin
- This connection member has a connection part 514Ba (connection end part) suitable for being connected to the soundboard 7 of the musical instrument, and the length thereof can be adjusted.
- the connecting member includes a cap 512 ′ and a male threaded portion 519 a (first member) coupled to the bobbin 511, and a connecting shaft that is displaceably coupled to the cap 512 ′ and the male threaded portion 519 a (first member).
- 514B second member
- a chuck 519 fastening tool
- FIG. 37 is a schematic side view showing a mechanism for adjusting the height position of the vibration exciter according to the fifth embodiment of the present invention.
- the vibration device 50E includes a vibration member 51, a magnetic circuit element 52, and a damper 53.
- the magnetic circuit element 52 includes a top plate 521, a magnet 522, and a yoke 523, and the vibration member 51 has a bobbin 511 provided with a voice coil.
- a cap 512 is coupled to the upper end of the bobbin 511, a shaft 514C extends from the upper surface of the cap 512, and the upper end of the shaft 514C serves as a connection portion 514Ca.
- the vibration device 50E is connected to and supported by the support portion 55 via a plurality of support bars 551.
- the support portion 55 is supported by a pair of height adjustment plates 71 provided on the left and right side surfaces so that the height can be adjusted.
- the pair of height adjustment plates 71 are fixed to an appropriate base portion 70 (for example, the straight column 9 of the piano or the floor described above).
- the height adjusting plate 71 is formed with a pair of guide long holes 72a and 72b extending in the vertical direction. On the side surface of the support portion 55, protrusions 552a and 552b are fitted into the guide long holes 72a and 72b. Is provided.
- the upper edge of the height adjustment plate 71 is an angle (or horizontal flange) 71a bent at a right angle in the horizontal direction.
- An angle (or horizontal flange) 55a protruding in the horizontal direction is also provided at the lower edge portion of the side surface of the support portion 55.
- a long bolt 73 is used to connect the upper and lower angles 71a and 55a by adjusting the length.
- Bolt-passing holes are provided at predetermined locations on the angle 71a at the upper edge of the adjustment plate 71, and bolt-passing holes are also provided at predetermined locations on the angle 55a at the lower edge of the support portion 55.
- a wing nut 74 is disposed on the lower surface side of the angle 55 a at the lower edge of the support portion 55 and is screwed into the bolt 73.
- a nut 75 is disposed on the upper surface side of the angle 71 a at the upper edge of the height adjustment plate 71 and is screwed into the bolt 73. Accordingly, the support portion 55 can be lowered downward by loosening the wing nut 74, and the support portion 55 can be raised upward by tightening the wing nut 74.
- the height position of the support portion 55 can be arbitrarily adjusted, whereby the connection portion 514Ca at the tip of the vibration member 51 of the vibration excitation device 50E is connected to the soundboard 7 at the time of assembly.
- the height of the support portion 55 can be raised until it abuts against the back surface of the plate, and the connection portion 514Ca is adhered to the soundboard 7 at that position, and the height position of the support portion 55 is maintained as it is.
- the height of the support portion 55 does not necessarily indicate the height in the vertical direction, but in the direction from the support portion 55 toward the connection end portion 514Ca (or 516A or the like) of the vibration device 50E (or 50 or the like).
- the present invention can be grasped as a voice coil actuator or a voice coil actuator such as the vibration devices 50 to 50E that apply vibration to the soundboard 7. Further, according to another aspect, the present invention includes a voice coil type actuator or a voice coil type actuator such as the vibration devices 50 to 50E that apply vibration to the soundboard 7 as shown in the above embodiments. It can also be understood as a keyboard instrument such as the grand piano 1 or other types of instruments.
- the target to which the vibration devices 50 to 50E are attached is not limited to an acoustic piano, but may be any musical instrument that can be equipped with an electronic piano or other soundboard, such as a guitar having a soundboard or a soundboard.
- a vibration device 50 to 50E is attached to a musical instrument having a soundboard, and a drive signal corresponding to the operation of the performance operator is output to the vibration devices 50 to 50E. It only needs to function as an actuator that vibrates the soundboard according to the drive signal.
- the magnetic circuit element 52 is supported by a member such as a support portion 55 attached to the casing of each musical instrument.
- the present invention is not limited to these, and a method for attaching a voice coil type actuator to a musical instrument by an operator performing the work shown in FIGS. 6 and 24, or a musical instrument equipped with a voice coil type actuator. It can also be grasped as a manufacturing method.
Abstract
Description
これらの発音モードをリストすると以下の表1に示すようになる。
図2は、グランドピアノ1の内部構造を説明する図である。この図においては、各鍵2に対応して設けられている構成については、1つの鍵2に着目して示し、他の鍵2に対応して設けられている部分については記載を省略している。
図4は、本発明の第1実施例に従う加振装置50の外観を説明する図である。加振装置50は、振動部材51と磁気回路要素52とダンパ53とを有する。振動部材51は、ボビン511に装着されたボイスコイル513、ボビン511の先端部に結合したキャップ512、シャフト514及びスペーサ516を有する。キャップ512は、円盤状の部材である。シャフト514は、棒状の部材であり、長手方向の一方の端部がキャップ512の円状の面の中心に固定され、他方の端部にスペーサ516が取り付けられている。スペーサ516は、円柱状の部材であり、シャフト514に取り付けられている側とは反対側に平らな面を有する。この面は、直径がΦ1の円形となっており、響板7に接続される面である。以下では、この面の法線に沿った方向を法線方向A1といい、その正方向はこの面が向いている方向であるものとする。また、以下の各図では、加振装置50の法線方向A1の正方向側を上側とし、法線方向A1の負方向側を下側とする。また、上側を向いた面を上面といい、下側を向いた面を下面という。スペーサ516が有する上述した面は、上面516Aという。
図14は、制御装置10の構成を示すブロック図である。制御装置10は、制御部11、記憶部12、操作パネル13、通信部14、信号発生部15、およびインターフェイス16を有する。これらの各構成はバスを介して接続されている。
制御部11は、CPU(Central Processing Unit)などの演算装置、ROM(Read Only Memory)、およびRAM(Random Access Memory)などの記憶装置を有する。制御部11は、記録装置に記憶されている制御プログラムに基づいて、制御装置10の各部およびインターフェイス16に接続された各構成を制御する。この例においては、制御部11は、制御プログラムを実行することにより、制御装置10および制御装置10に接続された構成の一部を、本発明の楽器として機能させる。
信号発生部15は、音響信号(オーディオ波形信号)を出力する音源部151、この音響信号の周波数特性を調整するイコライザ(EQ)部152、この音響信号を増幅する増幅部153を有する(図15参照)。信号発生部15は、周波数特性が調整されて増幅された音響信号を、駆動信号として出力する。
次に、制御部11が制御プログラムを実行することにより機能する構成について説明する。図15は、グランドピアノ1の機能構成を示すブロック図である。図15に示すように、鍵2が操作されると、ハンマ4が弦5を打撃し、弦5が振動する。この振動は、駒6を介して響板7に伝達される。また、鍵2の操作、ペダル3の操作によりダンパ8が動作する。ダンパ8の動作により、弦5の振動の抑制状態が変化する。
上述した実施形態は、本発明の第1実施例の一例に過ぎず、以下のように変形させてもよい。また、上述した実施形態及び以下に示す各変形例は、必要に応じて組み合わせて実施してもよい。
固定治具は、上述した固定治具54とは異なる形状であってもよく、また、所望の位置関係に自動的に位置決めできる機能を有していなくてもよい。すなわち、固定治具は、トッププレート521に取り付けられた場合に、ボビン511の上側の端部のトッププレート521の上面521Aからの高さがL2となっていること(磁路空間内でボイスコイル513が所定の取付基準位置に配置されていること)、すわなち、ボイスコイル513が磁路空間525に対して所望の位置関係となっているか否かを、自動的に又は作業者が目視で確認できるように、示す基準位置指示部材として機能するものであれば、どのような形状であってもよい。
固定治具の代わりに、コイル長中心及び磁路幅中心が一致するときの振動部材51の位置を確認できる部分が磁気回路要素52に設けられていてもよい。図17は、本変形例に係る磁気回路要素52rを示す図である。磁気回路要素52rが有するトッププレート521rは、上面521Arと、上面521Arからの高さがL2となる突起部521Eとを上面521Arに有している。作業者は、図6のステップS14においてシャフト514を上側に移動させるときに、突起部521Eの上面521Fに沿った位置にボビン511の上側の端部が来るように、シャフト514の位置を調整する。以上のとおり、磁気回路要素52r(磁路形成部)は、ボイスコイル513が磁路空間525に対して所望の位置となっているか否かを、振動部材51に対する相対的な位置を示す突起部521Eを有する。すなわち、突起部521Eは、ボイスコイル513と磁路空間525とのボビン511の軸方向の相対位置が所望の関係となっているか否かを目視にて確認するための基準を示す基準位置指示部材である。これにより、作業者は、コイル長中心及び磁路幅中心が略一致するように目視確認しながら振動部材51の磁気回路要素52に対する位置を調整することができる。
磁気回路要素52は、上述した実施形態とは異なる方法で支持部55に支持されてもよい。例えば、トッププレート521の代わりにヨーク523に上側の面から下側の面まで貫通する孔を設けて、支持棒551及び複数のナット552により支持部55に支持されてもよい。また、磁気回路要素52は、図9では支持部55と接触していないが、支持部55と接触された状態で支持されてもよい。また、支持部55は、上述した実施形態ではグランドピアノ1の筐体に固定されていたが、それ以外の場所に固定されていてもよく、例えば、地面(床)に固定されていてよい。いずれの場合であっても、要するに、ボビン511から響板7までの距離が上述した端部移動範囲に収まるように磁気回路要素52が支持されるようになっていればよい。
加振装置50においては、ボイスコイル513から発生した熱を測定するため、温度を測定する熱センサを図5に示すキャップ512の平坦な上面512Aに取り付けてもよい。図18は、本変形例に係る加振装置50sを示す図である。加振装置50sが備える振動部材51には、熱センサ56が取り付けられている。熱センサ56は、キャップ512の上面512Aに接触するように取り付けられて上面512Aの温度を測定する温度測定手段である。
キャップ512は、放熱をしやすい形状としてもよい。ボイスコイル513で発生した熱は、トッププレート521、523又はボビン511を経由して空気に放射される。トッププレート521、523を経由する場合、これらのヨークは、ボビン511に比べると、表面積が大きいために多くの熱を放射することができるが、ボイスコイル513との間を空気により隔てられているため、伝えられてくる熱の量が少ない。一方、ボビン511は、これらのヨークに比べると、ボイスコイル513と直接接触しているため伝えられてくる熱の量は大きいが、空気と触れている面積が小さいため、放出できる熱が少ない。ただし、ボビン511に伝えられてきた熱は、キャップ512にも伝わるので、そこから空気に放射されることになる。よって、放熱をより多くする必要がある場合は、キャップ512を放熱しやすい形状としてもよい。
振動部材51は、上述した実施形態では、スペーサ516を有していたが、これを有していなくともよい。この場合、シャフト514の上面が直接響板7に接続することになる。ボビン511、キャップ512及びシャフト514は、上述した実施形態では、いずれもアルミ素材により形成されている。この場合、振動部材51がスペーサ516を介さず響板7に接続すると、スペーサ516を介す場合に比べて、ボイスコイル513から発生した熱を響板7に多く伝えることになり、特に響板7が上述した実施形態のように木材で形成されていると、響板7が熱による影響をより多く受けることになる。このことは、ナット515、キャップ512の一部又はシャフト514の一部等にスペーサ516よりも熱伝導率が小さいものを用いても同じである。要するに、振動部材51が、スペーサ516と、スペーサ516よりも熱伝導率が大きい部分とを有するものであれば、スペーサ516を介して響板7に伝わる熱が、スペーサ516を介さないで響板7に熱が伝わる場合に比べて少なくなり、響板7への熱による影響が少なくなる。
ボビン511、キャップ512、シャフト514、ナット515及びスペーサ516は、上述した実施形態とは異なる材料でそれぞれ形成されていてもよい。例えば、ボビン511、キャップ512及びシャフト514は、アルミ素材の金属を材料として形成されていたが、銅等を材料としてもよいし、樹脂やプラスチックなどを材料としてもよい。いずれの材料を用いる場合も、強度、重量、非磁性体か否か、耐熱性の有無等が、ボイスコイル型のアクチュエータとして求められる条件を満たすものが用いられていればよい。
シャフト514は、上述した実施形態とは異なる形状であってもよい。図20は、本変形例に係るシャフトの一例であるシャフト514uの外観を示す図である。シャフト514uは、管状の管状部材514u1と、軸方向A2に延伸する延伸部材514u2と、ボルト514u3とを有する。延伸部材514u2は、管状部材514u1の内径よりも直径が小さい円柱状に形成された円柱部と、円中部に連続する雄ねじが切られた雄ねじ部とを有する。延伸部材514u2は、キャップ512の孔部512Gに雄ねじ部がねじ込まれた状態でナットを用いて固定されている。延伸部材514u2の円柱部には、軸方向A2に直交する方向に貫通する1つの孔が空いている。管状部材514u1は、軸方向A2の一方の端部が接着剤等でスペーサ516に固定されている。また、管状部材514u1には、軸方向A2に直交する方向に部材全体を貫通する孔が、軸方向A2に異なる位置で、複数箇所(例えば4箇所)に空いている。管状部材514u1及び延伸部材514u2に空いているこれらの複数の孔には、雌ねじがそれぞれ切られており、ボルト514u3がねじ込ませられるようになっている。ボルト514u3の雄ねじが切られている部分は、管状部材514u1の外径よりも長くなっており、管状部材514u1を貫通するようになっている。管状部材514u1の内側には、延伸部材514u2の円柱部が差し込まれており、管状部材514u1に空いている孔のいずれかと円柱部に空いている孔とが一列に並んだ状態でこれらの孔にボルト514u3がねじ込まれている。これにより、延伸部材514u2及び管状部材514u1が固定されている。シャフト514uは、ボルト514u3をねじ込む管状部材514u1側の孔を変えることで、キャップ512からの高さを複数段階(例えば4段階)で変えることができる。
シャフト移動範囲の上側の限界の位置として、シャフト514の下端が孔部512Gの下端よりも上側となる位置が定められていてもよい。この場合であっても、上記の接続部材が、ボビン511に設けたボイスコイル513を、磁路空間525における所定の位置に合わせられるようにしながら、響板7に対して接続端部が接続されるように、全体の長さを調整して固定するようになっていればよい。ここでいう所定の位置に合わせるとは、言い換えれば、ボイスコイル513とトッププレート521とが所定の位置関係となることであり、例えば、ボイスコイル513がトッププレート521と対向することである。
図6に示す取り付け作業において、ステップS11で行われる作業は、ステップS14の作業よりも前に行われていれば、他の作業(ステップS12、S13)の後に行われてもよい。要するに、固定治具54は、ステップS14でシャフト514を移動させてスペーサ516を響板7に接続するときに、磁気回路要素52に対する振動部材51の相対的位置関係が、コイル長中心及び磁路幅中心が略一致する状態になっていることを、自動的に若しくは目視で、確認できるように取り付けられていればよい。
上記実施例において、加振装置50において、ダンパ53が省略されていてもよい。その場合、加振装置50の響板7への取り付け前においては、振動部材51のアセンブリと磁気回路要素52のアセンブリとが分離されているので、図6におけるステップS13、S14の工程をステップS12の前に行い、振動部材51のアセンブリを先に響板7の情報定位置に取り付ける。それから、ステップS12の工程を行い、磁気回路要素52の磁路空間内にボイスコイル513を備えたボビン511が適切に納まるようにして、磁気回路要素52を支持部55に据え付ける。そして、ステップS14の工程を行い、磁気回路要素52に対する振動部材51の相対的位置関係が、コイル長中心及び磁路幅中心が略一致する状態となるように、シャフト514の長さ調整を行う。
図22は、本発明の第2実施例に従う加振装置50Aの外観を説明する図である。この第2実施例に係る加振装置50Aは、前述の第1実施例に係る加振装置50が持つような取付用のシャフト514を具備していない。第2実施例に係る加振装置50Aは、これを響板7に取り付けるための構造が前述の第1実施例に係る加振装置50とは相違しているが、その他の加振装置としての本来の機能を果たすための構造は同じであってよい。従って、以下の第2実施例に関連する説明及び図面において、前述の第1実施例と同一の図面参照番号は同一機能及び/又は同一機能の部品を示しているため、再度の詳細説明は省略する。
これにより、響板7は、ボビン511が上方に移動した場合には上方に押され、ボビン511が下方に移動した場合には、ボビン511が離れるのではなく、ボビン511により下方に引っ張られることになる。このようにして、ボビン511における振動は、響板7を介して駒6に加えられ、さらには、弦5に伝達される。
上述した実施形態は、本発明の第2実施例の一例に過ぎず、以下のように変形させてもよい。また、上述した実施形態及び以下に示す各変形例は、必要に応じて組み合わせて実施してもよい。
キャップ512は、上述した実施形態では、固定部材として木ねじ61を用いて響板7に固定されたが、それ以外のものを固定部材として用いてもよい。例えば、キャップ512は、ボルト及びナットや、釘を用いて響板7に固定されてもよいし、接着剤で響板7に固定されてもよい。望ましくは、キャップ512の中央部が孔512G´を通した木ねじ等で固定され、上面512Aの外周側の端部が接着剤等で固定されるとよい。上面512Aの外周側の端部には、ボビン511により下側に向けて引っ張る力も加わる。その端部を前述のとおり固定することで、上面512Aの外周側の端部が響板7から離れて浮き上がってしまうことを防ぐことができる。
木ねじ61を用いてキャップ512を響板7に固定する際、ワッシャー(座金)が用いられてもよい。この場合、キャップ512の下側にワッシャーを配置して、木ねじ61をワッシャーと孔512G´とを通して響板7にねじ込ませる。これにより、ワッシャーを用いない場合に比べて、木ねじ61が緩みにくくなる。
ボビン511に取り付けるキャップは、上述した実施形態のキャップ512とは異なる形状をしたものであってもよい。図28は、本変形例に係るキャップの一例であるキャップ512mを示す図である。図28(a)では、キャップ512mが木ねじ61により響板7に固定される前の状態を示している。キャップ512mは、キャップ512を外周側から中央部側にいくにつれて下側に窪ませるように変形させた形状をしている。図28(b)では、キャップ512mの孔512Gmに木ねじ61を通して響板7に固定した状態を示している。キャップ512mは、木ねじ61により響板7側に押し付けられることで、窪んでいた中央部も矢印の方向に持ち上げられて、響板7と接触するように変形する。
上述した実施形態では、作業者は、図24のステップS22において、キャップ512の上側の上面512Aを響板7に接触させるだけであったが、例えば、ステップS23からS25までの作業に要する時間が経過するまでは上面512Aの響板7に接触する位置をずらすことができる程度に固まるまで時間がかかる接着剤を用いてもよい。この接着剤は、完全に固まる前であっても、例えばダンパ53の撓みによって加わる力では響板7と上面512Aとが接触する位置がずれない程度にキャップ512を固定する。これにより、ステップS23の作業中にわずかに磁気回路要素52が傾いただけで響板7と上面512Aとが接触する位置がずれるといったことが抑制されて、作業者が磁気回路要素52を支持部55に固定する作業を行いやすくなる。
第2実施例におけるボビン511及びキャップ512は、上述したものとは異なる材料でそれぞれ形成されていてもよい。例えば、ボビン511は、アルミ素材の金属を材料として形成されていたが、これに限らず、銅等を材料としてもよいし、樹脂やプラスチックなどを材料としてもよい。また、キャップ512は、樹脂を材料として形成されていたが、これに限らず、アルミ素材や銅などの金属又はプラスチック等を材料として用いてもよい。いずれの材料を用いる場合も、強度、重量、非磁性体か否か、耐熱性の有無等が、ボイスコイル型のアクチュエータとして求められる条件を満たすものが用いられていればよい。
磁気回路要素52は、上述した実施形態とは異なる方法で支持部55に固定されてもよい。例えば、トッププレート521の代わりにヨーク523に上側の面から下側の面まで貫通する孔を設けて、支持棒551及び複数のナット552により支持部55に固定されてもよい。また、図26では、磁気回路要素52が支持部55と接触していないが、これらを接触させて固定してもよい。その場合は、支持部55の軸方向A2の位置(高さ位置)を調整可能に構成し、その位置を調整することで、振動部材51及び磁気回路要素52の軸方向A2に対する相対的な位置(高さ位置)が理想的な状態を維持したまま、加振装置50Aを響板7に取り付けることができる。
第1実施例の前記変形例1(図16)と同様に、第2実施例においても、固定治具は、上述した固定治具54とは異なる形状であってもよく、前記図16に示した固定治具54qと同様のものを用いることができる。図31は、第2実施例において、前記図16に示した固定治具54qと同様のものを用いた例を示す。この場合、作業者は、図24のステップS23において、キャップ512の上面512Aが響板7に接触している状態で、固定治具54qの上面54Aqに沿った位置にボビン511の上側の端部が来るように、目視確認しながら、磁気回路要素52を支持部55に支持させる。これにより、コイル長中心及び磁路幅中心が略一致するように、つまり、振動部材51と磁気回路要素52との相対位置が所望の関係となるように設定することができる。
第1実施例の前記変形例2(図17)と同様に、第2実施例においても、固定治具の代わりに、コイル長中心及び磁路幅中心が重なるときの振動部材51の位置を確認できる部分が磁気回路要素52に設けられていてもよい。図32は、本変形例に係る磁気回路要素52rを示す図である。すなわち、磁気回路要素52rが有するトッププレート521rは、上面521Arと、上面521Arからの高さがL2となる突起部521Eとを上面521Arに有している。この場合、作業者は、図24のステップS23において、突起部521Eの上面521Fに沿った位置にボビン511の上側の端部が来るようにしながら、磁気回路要素52を支持部55に支持させる。
前記孔512G´及び孔523Gは、上述した実施形態では、軸方向A2に沿ってキャップ512及びヨーク523をそれぞれ貫通していたが、これとは異なる方向に貫通していてもよい。図33は、本変形例に係る加振装置50Bを示す図である。加振装置50Bは、キャップ512sとヨーク523sとを備える。キャップ512sは、孔512Gsを有し、ヨーク523sは、孔523Gsを有する。孔512Gs及び523Gsは、それぞれ軸方向A2に対して角度をなす方向A5に沿っている。図33では、ボビン511とヨーク523との磁束線の方向(図23において破線で示した方向)である磁束線方向A6、A7の距離がいずれもL4となっている。これは、図23で示したように、ボビン511とヨーク523との軸合わせがなされている状態を示している。そして、この状態において、キャップ512の孔512Gsは、孔523Gsの方向A5に一致するように斜めに配置されている。孔523Gsが本発明に係る「孔」の一例であり、キャップ512の上面に現れた孔512Gsの開口が本発明に係る「指示領域」の一例である。また、方向A5が本発明に係る「第1方向」の一例である。以上のとおり設けられている孔512Gs及び523Gsを通して、図27に示したドライバー62及び木ねじ61を斜め上向きに通過させることで、これらの孔が一直線に並び、上記軸合わせがなされた状態でキャップ512sを響板7に固定することができる。
ボビン511の上側の端部は、キャップ512が取り付けられていたが、ボビン自体がキャップ512を含む形状に形成されていてもよい。図34は、本変形例に係る振動部材51tを示す図である。振動部材51tは、ボビン511t及びボイスコイル513を有する。ボビン511tは、アルミ素材を材料として、図23に示すボビン511及びキャップ512を合わせた形状に形成されている。ボビン511tは、上側の端部に軸方向A2に貫通する孔511Gtを有する。ボビン511tは、本発明に係る「ボビン部」の一例である。
磁気回路要素52は、上述した実施形態とは異なる方法で支持部55に支持されてもよい。例えば、トッププレート521の代わりにヨーク523に上側の面から下側の面まで貫通する孔を設けて、支持棒551及び複数のナット552により支持部55に支持されてもよい。また、磁気回路要素52は、図26では支持部55と接触していないが、支持部55と接触された状態で支持されてもよい。また、支持部55は、上述した実施形態ではグランドピアノ1の筐体に固定されていたが、それ以外の場所に固定されていてもよく、例えば、地面(又は床)に固定されていてよい。いずれの場合であっても、要するに、ボビン511から響板7までの距離が上述した端部移動範囲に収まるように磁気回路要素52が支持されるようになっていればよい。
振動部材51、磁気回路要素52及びダンパ53は、いずれも図23に示す法線方向A1に見たときに円形となる形状であったが、これには限らない。この形状は、例えば、楕円や方形であってもよい。要するに、ボイスコイルに入力された駆動信号が示す波形に応じて振動部材51が振動するようになっていれば、上記形状はどのような形状であってもよい。その場合であっても、上述した円筒部523Fのように磁路形成部のボビン部の内側に配置される部分は、ボビン部の内側と接触しないように配置することができる大きさとなっており、上述したヨーク523のように磁路形成部のボビン部の外側に配置される部分は、ボビン部の外側と接触しないように配置することができる大きさとなっている。
ボビン511の端部に結合し、響板7に接続されるのに適した端部部材(キャップ512)の構造は、上述のような平板状のキャップに限らない。例えば、ボビン511の先端からある程度上方に延びた長手状の、中空ロッド形状からなっていてもよい。その場合、中空ロッドの先端面は閉じていてねじ通し用の孔512G’が設けられる。中空ロッドのために、固定部材である木ねじ61は、該ロッド内を通過して先端面の孔512G’に到達しうる。
図35は、本発明の第3実施例に従う加振装置50Cの縦断面図である。この第3実施例に係る加振装置50Cは、振動部材51を響板7に取り付けるための取り付け長さ調整可能な接続用シャフト514Aの構造が、前述の第1実施例に係る加振装置50が持つようなシャフト514の構造と相違している。この第3実施例に従う加振装置50Cは、その他の加振装置としての本来の機能を果たすための構造は、第1あるいは第2実施例に係る加振装置50、50Aと同じであってよい。従って、以下の第3実施例に関連する説明及び図面において、前述の第1あるいは第2実施例と同一の図面参照番号は同一機能及び/又は同一機能の部品を示しているため、再度の詳細説明は省略する。
図36は、本発明の第4実施例に従う加振装置50Dの縦断面図である。この第4実施例に係る加振装置50Dは、振動部材51を響板7に取り付けるための取り付け長さ調整可能な接続用シャフト514Bの構造が、前述の第1、第3実施例に係る加振装置50、50Cが持つような接続用シャフト514、514Aの構造と相違している。シャフト514Bの長さ調節のためにチャック519を使用する点は、第3実施例に似ているが、チャック519の構造が第3実施例のチャックとは相違している。以下の第4実施例に関連する説明及び図面において、前述の第1~第3実施例と同一の図面参照番号は同一機能及び/又は同一機能の部品を示しているため、再度の詳細説明は省略する。
図37は、本発明の第5実施例に従う加振装置の高さ位置を調整するための機構を示す側面略図である。加振装置50Eは、上記各実施例と同様に、振動部材51と磁気回路要素52とダンパ53とで構成され、磁気回路要素52はトッププレート521、磁石522及びヨーク523を有し、振動部材51はボイスコイルを備えたボビン511を有する。ボビン511の上端にキャップ512が結合し、キャップ512の上面からシャフト514Cが延び、シャフト514Cの上端は接続部514Caとなっている。この第5実施例では、シャフト514Cの長さは前記第2実施例に示されたもののように固定されているものとする。しかし、前記第1、第3、第4実施例に示されたものようにシャフト514の長さを調整できるタイプのものを該シャフト514Cとして用いてもよい。図9等を参照して説明したものと同様に、加振装置50Eは、複数の支持棒551を介して支持部55に連結され、支持される。支持部55は、左右側面に設けられた1対の高さ調整プレート71によって高さ調整可能に支持される。1対の高さ調整プレート71は、適宜のベース部70(例えば前述したピアノの直支柱9あるいは床等)に固定されている。
上記各実施例に示したように、本発明は、響板7に振動を加える加振装置50~50Eのようなボイスコイル型のアクチュエータ又はボイスコイル型のアクチュエータとして把握され得る。また、別の観点に従うと、本発明は、上記各実施例に示したような響板7に振動を加える加振装置50~50Eのようなボイスコイル型のアクチュエータ又はボイスコイル型のアクチュエータを備えるグランドピアノ1のような鍵盤楽器、あるいは、その他のタイプの楽器としても把握され得るものである。なお、加振装置50~50Eが取り付けられる対象は、アコースティックピアノに限らず、電子ピアノあるいはその他の響板を装備可能な楽器であればよく、例えば、響板を有するギターや、響板を有するスピーカを演奏操作子の操作に応じて鳴らす新タイプの楽器等であってもよい。いずれの場合も、響板を有する楽器に加振装置50~50Eが取り付けられ、演奏操作子の操作に応じた駆動信号が加振装置50~50Eに出力され、加振装置50~50Eがその駆動信号に応じて響板を振動させるアクチュエータとして機能するようになっていればよい。これらの場合、磁気回路要素52は、各楽器の筐体に取り付けられた支持部55のような部材により支持される。また、本発明は、これらのみならず、作業者が図6、図24に示すような作業を行うことによるボイスコイル型のアクチュエータの楽器への取り付け方法や、ボイスコイル型のアクチュエータを備える楽器の製造方法としても把握され得るものである。
特に詳しく説明しないが、上述した種々の実施例の各々において、その一部の構成要素若しくは一部の特徴を他の実施例においても可能な限り適宜適用してよいのは勿論である。
Claims (24)
- 楽器の響板を振動させるためのアクチュエータであって、
磁路空間を形成するように構成された磁路形成部と、
ボイスコイルを装着し、該ボイスコイルを前記磁路空間内に配置するボビンと、
前記ボビンに結合し、該ボビンの振動に伴って振動するように構成された接続部材であって、前記接続部材は、前記楽器の響板に接続されるのに適した接続端部を有し、かつ、その長さを調整可能に構成されているものと、
を備えるアクチュエータ。 - 前記接続部材は、棒状部材と、該棒状部材の回転変位を該棒状部材の直線変位に変換するねじ構造とを具備する、請求項1に記載のアクチュエータ。
- 前記接続部材は、前記ボビンに結合した第1部材と、前記第1部材に対して変位可能に結合する第2部材と、前記第1部材と前記第2部材の結合部位を締め付けて固定する締め付け具とを具備する、請求項1に記載のアクチュエータ。
- 前記接続部材は、前記接続端部を形成する端部部材と、当該端部部材よりも熱伝導率が大きい部分とを具備する、請求項1乃至3のいずれかに記載のアクチュエータ。
- 前記接続部材は、前記ボビンが開口する部分に固定されている平坦な面を有するキャップを具備し、
前記キャップの前記面には、当該面の温度を測定するための温度測定器が取り付けられる、請求項1に記載のアクチュエータ。 - 前記響板には響棒が設けられており、
前記接続部材は、前記接続端部が前記響板の前記響棒が設けられている側に接続され、かつ、前記響棒の前記響板からの高さよりも前記ボビンから前記接続端部までの距離が長くなるように前記長さを調整した状態で、前記響板に接続され固定される、請求項1乃至5のいずれかに記載のアクチュエータ。 - 前記磁路空間内での前記ボイスコイルの取付基準配置を示すための基準位置指示部材を備える、請求項1乃至6のいずれかに記載のアクチュエータ。
- 前記ボビンが前記磁路空間内に配置されるように、前記ボビンを前記磁路形成部に連結するダンパを更に備える、請求項1乃至7のいずれかに記載のアクチュエータ。
- 請求項1乃至8のいずれかに記載のアクチュエータと、
前記磁路形成部を支持する支持部と、
前記接続端部が接続された響板と、
演奏操作子と、
前記演奏操作子の操作に応じたオーディオ波形を表す駆動信号を発生する信号発生部であって、前記駆動信号は前記ボイスコイルを駆動するために前記アクチュエータに供給されるものと
を備える楽器。 - 請求項1乃至8のいずれかに記載のアクチュエータを楽器に取り付ける方法であって、
前記楽器の前記響板に対する前記アクチュエータの取り付け位置に対応して支持部を設置し、前記磁路形成部を該支持部に据え付けるステップと、
前記接続端部が前記響板の方に移動するように前記接続部材の長さを調整し、該接続端部を前記響板に接続するステップと、
前記接続端部が前記響板に接続されるように調整された前記接続部材の長さを固定するステップと
を備える方法。 - 前記接続部材の長さを調整することは、前記磁路空間内での前記ボイスコイルの取付基準位置を維持しつつ前記接続部材の長さを調整することからなる、請求項10に記載の方法。
- 前記磁路空間内での前記ボイスコイルの取付基準位置を維持するために、前記磁路空間内での前記ボイスコイルの取付基準位置を示す基準位置指示部材が利用される、請求項11に記載の方法。
- 前記接続端部を前記響板に接続する前記ステップを行う前に、前記磁路形成部を据え付けた前記支持部の前記響板に対する相対的距離を調整するステップを更に備える請求項11又は12に記載の方法。
- 請求項1乃至8のいずれかに記載のアクチュエータを備える楽器の製造方法であって、
前記アクチュエータを備えていない楽器を提供するステップと、
前記楽器の前記響板に対する前記アクチュエータの取り付け位置に対応して支持部を設置し、前記磁路形成部を該支持部に据え付けるステップと、
前記接続端部が前記響板の方に移動するように前記接続部材の長さを調整し、該接続端部を前記響板に接続するステップと、
前記接続端部が前記響板に接続されるように調整された前記接続部材の長さを固定するステップと
を備える方法。 - 楽器の響板を振動させるためのアクチュエータであって、
磁路空間を形成するように構成された磁路形成部と、
ボイスコイルを装着し、該ボイスコイルを前記磁路空間内に配置するボビンと、
前記ボビンの端部に結合し、前記楽器の響板に接続される端部部材と
を具備し、
前記磁路形成部は、前記ボビンの内部空間内に挿入される部分を有し、該部分には前記ボイスコイルの軸方向に貫かれた通し孔が形成されており、
前記通し孔に対向する前記端部部材の箇所において、該端部部材を前記響板に接続するための固定部材を取り付けるべき位置を特定するマークが設けられている、
ことを特徴とするアクチュエータ。 - 前記マークは、前記端部部材の前記通し孔に対向する箇所に設けられた凹みであり、該凹みの箇所で前記固定部材を介して前記端部部材を前記響板に接続する、請求項15に記載のアクチュエータ。
- 前記凹みは孔であり、該孔を通して前記固定部材が前記響板に至り、前記端部部材を前記響板に接続する、請求項16に記載のアクチュエータ。
- 前記固定部材は、ねじである、請求項15乃至17のいずれかに記載のアクチュエータ。
- 請求項15乃至18のいずれかに記載のアクチュエータと、
前記磁路形成部を支持する支持部と、
前記端部部材が接続された響板と、
演奏操作子と、
前記演奏操作子の操作に応じたオーディオ波形を表す駆動信号を発生する信号発生部であって、前記駆動信号は前記ボイスコイルを駆動するために前記アクチュエータに供給されるものと
を備える楽器。 - 請求項15乃至18のいずれかに記載のアクチュエータを楽器に取り付ける方法であって、
前記楽器の前記響板に対する前記アクチュエータの取り付け位置に対応して支持部を設置し、前記磁路形成部を該支持部に据え付けるステップと、
前記磁路形成部の前記通し孔を通して、前記固定部材を前記端部部材の前記マークの位置まで持ってくるステップと、
前記マークの位置まで持ってきた前記固定部材により、前記端部部材を前記響板に固定するステップと
を備える方法。 - 前記固定部材は、ねじであり、
前記固定部材を前記端部部材の前記マークの位置まで持ってくる前記ステップは、前記ねじを非磁性材質のドライバの先端に付けて該ドライバを前記磁路形成部の前記通し孔を通することを含む、請求項20に記載の方法。 - 前記端部部材を前記響板に固定する前記ステップを行う前に、前記磁路形成部を据え付けた前記支持部の前記響板に対する相対的距離を調整するステップを更に備える請求項20又は21に記載の方法。
- 請求項15乃至18のいずれかに記載のアクチュエータを備える楽器の製造方法であって、
前記アクチュエータを備えていない楽器を提供するステップと、
前記楽器の前記響板に対する前記アクチュエータの取り付け位置に対応して支持部を設置し、前記磁路形成部を該支持部に据え付けるステップと、
前記磁路形成部の前記通し孔を通して、前記固定部材を前記端部部材の前記マークの位置まで持ってくるステップと、
前記マークの位置まで持ってきた前記固定部材により、前記端部部材を前記響板に固定するステップと
を備える方法。 - 楽器の響板を振動させるための装置であって、
磁路空間を形成するように構成された磁路形成部、
ボイスコイルを装着し、該ボイスコイルを前記磁路空間内に配置するボビン、及び
前記ボビンに結合し、かつ、前記楽器の響板に接続され、前記ボビンの振動を前記響板に伝達するのに適した接続部材、
を備えるアクチュエータと、
前記楽器の前記響板に対する前記アクチュエータの取り付け位置に対応して配置され、前記アクチュエータを支持する支持部と、
前記支持部の前記響板に対する相対的距離を調整するように構成された調整装置
を具備する装置。
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Also Published As
Publication number | Publication date |
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US9406288B2 (en) | 2016-08-02 |
EP2793221A4 (en) | 2016-03-30 |
EP2793221B1 (en) | 2018-06-13 |
KR20140091590A (ko) | 2014-07-21 |
US20150128790A1 (en) | 2015-05-14 |
JP6136933B2 (ja) | 2017-05-31 |
CN104115219B (zh) | 2017-06-23 |
EP2793221A1 (en) | 2014-10-22 |
CN104115219A (zh) | 2014-10-22 |
JPWO2013089239A1 (ja) | 2015-04-27 |
KR101607418B1 (ko) | 2016-03-29 |
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