CN105529018A - Keyboard instrument - Google Patents

Abstract

The invention provides a keyboard instrument. The keyboard instrument is provided with a string; a transmission part for transmitting vibration of the string; and piezoelectric sensors which is arranged along the extension direction of the transmission part and is used for detecting the vibration of the string via the transmission part.

Description

Keyboard instrument

Technical field

The present invention relates to keyboard instrument.

The application at the Patent 2014-212433 CLAIM OF PRIORITY of Japanese publication, quotes its content at this based on October 17th, 2014.Further, the application at the Patent 2015-000330 CLAIM OF PRIORITY of Japanese publication, quotes its content at this based on January 5th, 2015.

Background technology

In the musical instrument of primary sound with string, make Chord vibration by playing, this vibration is delivered to oscillating plate by transfer part, thus sounds.Such as, in primary sound piano, the vibration of string is delivered to soundboard by bridge, thus sounds.

In the past, externally export in order to the performance of this musical instrument is converted to electric signal or carries out record, considering to use concentric cable type piezoelectric transducer (piezoelectric sensor of wire) to detect the vibration (such as with reference to patent documentation 1 (United States Patent (USP) No. 6677514 instructions)) of the detected objects such as oscillating plate.Patent Document 1 discloses the piezoelectric sensor that wire is set in the qin bridge immediately below the qin saddle playing function in guitar as transfer part.

In the keyboard instrument of primary sound, make Chord vibration by playing, this vibration is delivered to soundboard by bridge, thus sounds.In order to record the performance etc. of keyboard instrument, need the vibration detecting string and soundboard etc., the sound sent.

In the past, as the mechanism for detecting vibration etc., the known structure utilizing microphone registers sound.But, in the structure shown here, there is the shortcoming of weak, the easy pickup of singing sound around.Further, each string is installed the structure of acoustic pickup, not only in tonequality, have unsatisfactory part, and be not easy to manufacture.

So, in order to improve tonequality, in patent documentation 2 (the real public clear 61-34558 publication of Japan), make to be arranged on the sound pick up equipment on iron skeleton and the lower surface point cantact in the portion that projects arranged on a side of bridge, the sensitivity of detection is improved.

Patent documentation 1: United States Patent (USP) No. 6677514 instructions

Patent documentation 2: the real public clear 61-34558 publication of Japan

Patent documentation 3: United States Patent (USP) No. 6239349 instructions

Patent documentation 4: United States Patent (USP) No. 6429367 instructions

First problem is described.

Have in the acoustic instrument of string this, oscillating plate and transfer part along with the vibration of string, mainly with the thickness direction of oscillating plate for principal oscillation direction vibrates.Therefore, in order to detect the vibration of oscillating plate and transfer part with utilizing piezoelectric sensor high-grade, require the sensitivity of the piezoelectric sensor guaranteeing the vibration detected on principal oscillation direction.

Second problem is described.

In patent documentation 2, the string of every two pitches arranges a sound pick up equipment, add to be provided with in bridge and multiplely project portion, complex structure, be not easy to manufacture.

Further, high precision must configure multiple sound pick up equipment, in order to suppress the deviation of accuracy of detection, the man-hour of manufacture easily increases.Therefore, in order to not make manufacture too complicated, improving the grade of detection signal, in the sound obtaining singing or disturb little tone color, still having room for improvement.

But, in patent documentation 1, patent documentation 3 (United States Patent (USP) No. 6239349 instructions), patent documentation 4 (United States Patent (USP) No. 6429367 instructions), describe the structure applying concentric cable type piezoelectric sensor (piezoelectric transducer) on guitar.This sensor cable is configured in qin bridge at Qin Anxia.In addition, also have the record of application sensors cable in piano, but its arranging mode is not studied.

Summary of the invention

The present invention makes in view of the foregoing.An object of the present invention is the keyboard instrument providing the vibration that can detect string.

In order to solve above-mentioned problem, the keyboard instrument of embodiment of the present invention possesses: string; Transmit the transfer part of the vibration of described string; Bearing of trend along described transfer part configures, and detects the piezoelectric sensor of the vibration of described string via described transfer part.

According to the present invention, the vibration of string can be detected.

Accompanying drawing explanation

Fig. 1 is the vertical view representing the musical instrument of embodiment of the present invention A and the major part of piano;

Fig. 2 is the stereographic map of the structure of the piezoelectric sensor representing embodiment of the present invention A;

Fig. 3 represents inner in the piano of Fig. 1 to be configured with the long bridge of piezoelectric sensor and the cut-open view of peripheral construction thereof;

Fig. 4 represents the inner cut-open view being configured with the short bridge of piezoelectric sensor, short bridge pin and its peripheral construction in the piano of Fig. 1;

Fig. 5 A represents the figure of the piezoelectric sensor in embodiment of the present invention A relative to an example of the installation method of long bridge;

Fig. 5 B represents the figure of the piezoelectric sensor in embodiment of the present invention A relative to an example of the installation method of long bridge;

Fig. 5 C represents the figure of the piezoelectric sensor in embodiment of the present invention A relative to an example of the installation method of long bridge;

Fig. 6 is the figure of an example of the flowing of the detection signal from piezoelectric sensor output represented in embodiment of the present invention A;

Fig. 7 is the cut-open view of the first variation of the groove formed in long bridge represented in embodiment of the present invention A;

Fig. 8 is the cut-open view of the second variation of the groove formed in long bridge represented in embodiment of the present invention A;

Fig. 9 represents piezoelectric sensor in the embodiment of the present invention A cut-open view relative to the variation of the configuration of short bridge and short bridge pin;

Figure 10 is the cut-open view of the variation of the position of the groove formed in long bridge represented in embodiment of the present invention A;

Figure 11 is the cut-open view of the variation of the long bridge represented in embodiment of the present invention A;

Figure 12 is the vertical view of the major part representing musical instrument in embodiment of the present invention B and piano;

Figure 13 is the stereographic map of the structure of the piezoelectric sensor represented in embodiment of the present invention B;

Figure 14 represents that piezoelectric sensor is relative to the cut-open view of the arranging mode of the string of high range in the piano of Figure 12;

Figure 15 be the piano of the Figure 12 seen from player side piezoelectric sensor relative in the front view of arranging mode of string of low range;

Figure 16 is that the A-A of Figure 15 is to arrow cut-open view;

Figure 17 is the figure of an example of the flow direction of the detection signal from piezoelectric sensor output represented in embodiment of the present invention B;

Figure 18 is the cut-open view of the variation of the structure of the effective string support representing embodiment of the present invention B.

Description of reference numerals

11 ... piano (musical instrument), 112 ... soundboard (oscillating plate), 112a ... upper surface (interarea of a side), 114 ... long bridge (transfer part), 115 ... short bridge, 117 ... string, 118 ... connecting member, 119 ... short bridge pin, 114A, 115A, 119A ... first dividing body, 114B, 115B, 119B ... second dividing body, 114c, 114d ... opposed faces, 130 ... path, 131 ... groove, 135 ... filling agent, 140, 140A, 140B, 140C ... piezoelectric sensor, 161 ... first transfer part, 162 ... second transfer part, 21 ... piano (keyboard instrument), 212 ... soundboard, 214 ... long bridge (bridge), 215 ... short bridge main body (bridge), 217 ... string, 230, 230A, 230B ... effective string support, 231A, 231B ... support main body, 232A, 232B ... bearing (contact site), 240, 240A, 240B ... piezoelectric sensor

Embodiment

(embodiment A)

Below, with reference to Fig. 1 ~ 6, embodiments of the present invention A is described.One of order of embodiment A is to provide a kind of sensitivity of piezoelectric sensor of the vibration that can improve on the principal oscillation direction of measuring vibrations plate and transfer part, detect to high-grade the musical instrument of the vibration of oscillating plate and transfer part.In the present embodiment, one and the piano 11 of keyboard instrument is illustrated as musical instrument.

As shown in Figure 1, the piano 11 of this embodiment is one and the grand piano of primary sound piano.Omit the diagram of top cover, string, keyboard etc. in FIG.Piano 11 possesses known basic structure and iron skeleton 111, soundboard (oscillating plate) 112, side plate 113, long bridge (transfer part) 114, short bridge (transfer part) 115, multiple stall bars 116 etc.Multiple stall bars 116 are fixed on the lower surface of soundboard 112 in parallel with each other.

Many strings 117 (with reference to Fig. 3,4) are configured in above upper surface (interarea of a side) 112a of soundboard 112, and utilize on iron skeleton 111 and hang string nail and tuning nail, be set to long bridge 114, short bridge 115 from string tuning button 121, bearing (not shown).

As shown in Figure 3,4, long bridge 114, short bridge 115 are configured between the upper surface 112a of soundboard 112 and string 117.Long bridge 114 is fixed on the upper surface 112a of soundboard 112, and is clipped between soundboard 112 and string 117.Short bridge 115 can be directly fixed on the upper surface 112a of soundboard 112 in the same manner as long bridge 114.In the present embodiment, short bridge 115 is fixed on soundboard 112 via connecting member 118 and short bridge pin (transfer part) 119.Specifically, short bridge pin 119 is fixed on the upper surface 112a of soundboard 112, and the lower surface of the connecting member 118 of tabular is fixed on the upper end of short bridge pin 119.And short bridge 115 is fixed on the upper surface of connecting member 118, and be clipped between the upper surface of connecting member 118 and string 117.Short bridge 115 and short bridge pin 119 are offseting one from another on the upper surface of connecting member 118 and the direction of lower surface relative to the fixed position of connecting member 118.

Operated by performance, string 117 is impacted by hammer and vibrates.The vibration of string 117 is delivered to soundboard 112 via long bridge 114.Further, the vibration of string 117 is delivered to soundboard 112 via short bridge 115, connecting member 118, short bridge pin 119.

As shown in Figure 1, from the thickness direction top view of soundboard 112, long bridge 114, short bridge 115, short bridge pin 119 are formed as banded.Further, the length of short bridge 115 and short bridge pin 119 is shorter than long bridge 114.Observe from player side, long bridge 114, short bridge 115, short bridge pin 119 follow oblique extension ventrally towards treble side (being seen as right side from player side) is close gradually.

Piano 11 possesses the piezoelectric sensor 140 of wire.Piezoelectric sensor 140, can elastic deformation when being subject to external force from the direction orthogonal with its length direction.As shown in Figure 2, the piezoelectric sensor 140 of present embodiment is section is circular concentric cable type sensor.Piezoelectric sensor 140 possess heart yearn 141, cladding core wire 141 outside piezoelectric element film 142, to be made up of braided wire and the outer conductive layer 143 of coated piezoelectric element film 142 from outside further.The outside of outer conductive layer 143 is protected by the parcel 144 with electrical insulating property be made up of tygon etc.

Piezoelectric element film 142 is made up of piezoelectric type polymkeric substance (piezopolymer), between heart yearn 141 and outer conductive layer 143, play function as insulator.In piezoelectric sensor 140, piezoelectric element film 142 is compressed power or tractive force, thus produces the electric charge proportional with this stress.

As shown in Fig. 1,3,4, piezoelectric sensor 140 is arranged on the respective inside of long bridge 114, short bridge 115, short bridge pin 119.From the thickness direction of soundboard 112, each piezoelectric sensor 140 configures with the bearing of trend of the mode overlapping with long bridge 114, short bridge 115, short bridge pin 119 along long bridge 114, short bridge 115, short bridge pin 119.

Then, piezoelectric sensor 140A is described relative to the installation constitution of long bridge 114.

As shown in Figure 3, long bridge 114 is divided into the first dividing body 114A of soundboard 112 side, the second dividing body 114B of string 117 side.Namely the first dividing body 114A and the second dividing body 114B is independently parts.In present embodiment, the first dividing body 114A and the second dividing body 114B is the parts that the bridge base by splitting long bridge 114 is formed.First dividing body 114A and the second dividing body 114B such as can fix by utilizing soundboard 112 and string 117 to clamp long bridge 114.In present embodiment, the first dividing body 114A and the second dividing body 114B is adhesively fixed by bonding agent (not shown).Groove 131 is formed at the opposed faces 114c of the first dividing body 114A opposed with the second dividing body 114B.Groove 131 is the grooves caved in towards the inner side of the first dividing body 114A.The opposed faces 114d of groove 131 and the second dividing body 114B opposed with the first dividing body 114A forms the path 130 inserted for piezoelectric sensor 140A together.

For the orientation of two dividing bodies 114A, 114B, the size (hereinafter referred to as height dimension) of the path 130 of long bridge 114 is less than the size of the piezoelectric sensor 140A under the state before being configured in path 30.The orientation of two dividing bodies 114A, 114B refers to the thickness direction (being above-below direction in figure 3) of soundboard 112.In the present embodiment, groove 131 is only formed at the first dividing body 114A.That is, the second dividing body 114B does not have the groove for receiving piezoelectric sensor 140A.Therefore, the depth dimensions of groove 131 less than the size (height dimension) of the piezoelectric sensor 140A relevant to the depth direction of groove 131 (with reference to Fig. 5 B).Further, the piezoelectric sensor 140A section of present embodiment is circular, and the height dimension of therefore above-mentioned path 130, the depth dimensions of groove 131 are less than the diameter dimension of piezoelectric sensor 140A.

And, for the Width (be in figure 3 left and right directions) orthogonal with the orientation of two dividing bodies 114A, 114B and the length direction of piezoelectric sensor 140A, the size (hereinafter referred to as width dimensions) of the path 130 of long bridge 114 is larger than the size of the piezoelectric sensor 140A under the state before being configured in path 130.In the present embodiment, the width dimensions of groove 131 larger than the size (width dimensions) of the piezoelectric sensor 140A relevant to the Width of groove 131 (with reference to Fig. 5 B).Path 130, the groove 131 of present embodiment are formed as rectangular-shaped at the section orthogonal with its length direction.

As mentioned above, setting is formed at height dimension and the width dimensions of the path 130 of long bridge 114.According to this structure, under the state of fixing two dividing bodies 114A, 114B, piezoelectric sensor 140A in path 130 is in the state of elastic deformation, for the short transverse of path 130, the size of piezoelectric sensor 140A diminishes, further, for the Width of path 130, the size of piezoelectric sensor 140A becomes large.Namely piezoelectric sensor 140A is in from the state of the circular section elastic deformation shown in Fig. 5 B for the oval-shaped profile shown in Fig. 3, Fig. 5 C.Thus, piezoelectric sensor 140A is in and is compressed the state of stress from the short transverse of path 130, the i.e. orientation of two dividing bodies 114A, 114B always.

In addition, in the gap between the path 130 and the piezoelectric sensor 140A being configured in path 130 of long bridge 114, filling agent 135 is filled with.The filling agent 135 of present embodiment is the bonding agent of two dividing bodies 114A, 114B of being adhesively fixed.

Be arranged at the piezoelectric sensor 140A of long bridge 114, such as shown in Figure 1, multiple sensor 140A1,140A2 can be divided into form.The quantity of sensor 140A1,140A2 is not limited to the example shown in Fig. 1.Preferred multiple sensor 140A1,140A2 arrange along the bearing of trend of long bridge 114, more preferably arrange in the not empty compartment of terrain of opening of the bearing of trend of long bridge 114.Preferred multiple sensor 140A1,140A2 are such as arranged as illustrated in fig. 1 as the end of adjacent sensor 140A1,140A2 overlaps each other.

As shown in Figure 4, the installation constitution of piezoelectric sensor 140B, 140C of short bridge 115 and short bridge pin 119 is identical with the situation of above-mentioned long bridge 114.That is, short bridge 115 is divided into the second dividing body 115B of the first dividing body 115A chord 117 side of soundboard 112 side.Namely the first dividing body 115A and the second dividing body 115B is independently parts.Short bridge pin 119 is divided into the second dividing body 119B of the first dividing body 119A chord 117 side of soundboard 112 side.Namely the first dividing body 119A and the second dividing body 119B is independently parts.First dividing body 115A and the second dividing body 115B is such as adhesively fixed by bonding agent.First dividing body 119A and the second dividing body 119B is such as adhesively fixed by bonding agent.Only be formed with groove 131 in the opposed faces of the first dividing body 115A opposed with the second dividing body 115B.Namely the second dividing body 115B does not have the groove for receiving piezoelectric sensor 140B.Only be formed with groove 131 in the opposed faces of the first dividing body 119A opposed with the second dividing body 119B.Namely the second dividing body 119B does not have the groove for receiving piezoelectric sensor 140C.The opposed faces of groove 131 and the second dividing body 115B is utilized to form the path 130 inserted for piezoelectric sensor 140B.The opposed faces of groove 131 and the second dividing body 119B is utilized to form the path 130 inserted for piezoelectric sensor 140C.

Path 130 in short bridge 115, short bridge pin 119, the shape of groove 131 and size are all identical with the situation of above-mentioned long bridge 114.Therefore, the piezoelectric sensor 140B in path 130 is in the state that elastic deformation is oval-shaped profile, is in the state being always compressed stress from the short transverse i.e. orientation of two dividing bodies 115A, 115B of path 130.Piezoelectric sensor 140C in path 130 is in the state that elastic deformation is oval-shaped profile, is in and is compressed the state of stress from the short transverse i.e. orientation of two dividing body 119A, 119B of path 130 always.

Further, the filling agent (not shown) identical with the situation of long bridge 114 is filled with at the path 130 of short bridge 115 with the gap between the piezoelectric sensor 140B configured in path 130.Also the filling agent (not shown) identical with the situation of long bridge 114 is filled with in the path 130 of short bridge pin 119 and the gap of the piezoelectric sensor 140C configured in path 130.

Further, the piezoelectric sensor 140B being arranged at short bridge 115 such as can be divided into multiple sensor to form in the same manner as the piezoelectric sensor 140A of long bridge 114.The piezoelectric sensor 140C being arranged at short bridge pin 119 such as can be divided into multiple sensor to form in the same manner as the piezoelectric sensor 140A of long bridge 114.

Then, with reference to Fig. 5 A ~ 5C, piezoelectric sensor 140A is described relative to an example of the installation method of long bridge 114.Piezoelectric sensor 140B, 140C are identical with long bridge 114 relative to the installation method of short bridge 115 and short bridge pin 119, therefore omit the description.

When piezoelectric sensor 140A is installed on long bridge 114, first, as shown in Figure 5A, the first dividing body 114A is configured in the opposed faces 114c mode upward of the first dividing body 114A of long bridge 114.Then, the first dividing body 114A opposed faces 114c adhesive-applying (not shown) and fill it in groove 131.

Afterwards, as shown in Figure 5 B, from the top of the first dividing body 114A, piezoelectric sensor 140A is inserted groove 131.In this condition, the lower portion of piezoelectric sensor 140A enters groove 131, and the upper portion of piezoelectric sensor 140A is given prominence to from the opposed faces 114c of the first dividing body 114A.Further, bonding agent (with reference to Fig. 3) is filled with as filling agent 135 in the gap between piezoelectric sensor 140A and the inside surface of groove 131.

Finally, as shown in Figure 5 C, the second dividing body 114B is pressed from the top of the first dividing body 114A, piezoelectric sensor 140A is clipped between two dividing bodies 114A, 114B, two dividing bodies 114A, 114B are fixed to one another in the mode of the opposed faces 114c of two dividing bodies 114A, 114B, 114d contact, thus, the installation of piezoelectric sensor 140A is completed.In present embodiment, two dividing bodies 114A, 114B are adhesively fixed by bonding agent.

When being fixed two dividing bodies 114A, 114B, for the orientation of two dividing bodies 114A, 114B, the mode generation elastic deformation that piezoelectric sensor 140A diminishes to make the size of piezoelectric sensor 140A.Thus, piezoelectric sensor 140A is in the state being always compressed stress from the orientation of two dividing bodies 114A, 114B.Further, above-mentioned fixing time, for the Width of groove 131, the mode generation elastic deformation that piezoelectric sensor 140A becomes large to make the size of piezoelectric sensor 140A.

After piezoelectric sensor 140A is installed on long bridge 114, as shown in Figure 3, by bonding grade, long bridge 114 is fixed on the upper surface 112a of soundboard 112.When this is fixing, the first dividing body 114A of long bridge 114 and the second dividing body 114B is arranged in order from the upper surface 112a of soundboard 112 along the thickness direction of soundboard 112.

As shown in Figure 4, after installation piezoelectric sensor 140C is installed on short bridge pin 119, short bridge pin 119 is fixed on the upper surface 112a of soundboard 112 in the same manner as long bridge 114.And, after piezoelectric sensor 140B is installed on short bridge 115, short bridge 115 is fixed on the upper surface of connecting member 118 by the mode be arranged in order above the upper surface 112a of soundboard 112 with the first dividing body 115A of short bridge 115 and the second dividing body 115B.

As shown in Figure 3,4, soundboard 112 is installed in the structure of long bridge 114, short bridge 115, short bridge pin 119, if the vibration of string 117 makes soundboard 112, long bridge 114, short bridge 115, short bridge pin 119 is subjected to displacement, vibrates, the compression stress then acting on each piezoelectric sensor 140 changes, and namely piezoelectric sensor 40 is made a response.At this, each piezoelectric sensor 140 is compressed stress from two dividing body 114A, 114B, two dividing bodies 115A, 115B or the orientation of two dividing body 119A, 119B and the thickness direction of soundboard 112.Therefore, it is possible to make a response relative to soundboard 112, long bridge 114, short bridge 115, the displacement of short bridge pin 119 on the thickness direction (principal oscillation direction) of soundboard 112, vibration more delicately.By the reaction of this piezoelectric sensor 140, from piezoelectric sensor 140 output detections signal.

From piezoelectric sensor 140 export detection signal such as shown in Figure 6, as voice data record in recording unit 151, or externally export as voice signal.Be recorded in the reproduction etc. of voice data for sound of recording unit 151.The detection signal of multiple piezoelectric sensor 140 can such as externally export as illustrated in fig. 6 after mixer 152 mixes, and also can such as independently export.Further, the detection signal of multiple piezoelectric sensor 140 can such as export to recording unit 151 as illustrated in fig. 6 independently, also can such as export to recording unit 151 after mixer 152 mixes.Further, detection signal can such as record or output after amplifier 153 amplifies as illustrated in fig. 6.Amplifier 153 such as individually can amplify the detection signal exported from multiple piezoelectric sensor 140 as illustrated in fig. 6, also can such as amplify at the mixed signal of mixer 152.

Further, can optionally record or export a part for the detection signal from multiple piezoelectric sensor 140.Such as, two piezoelectric sensors 140B, 140C being arranged at short bridge 115 and short bridge pin 119 mainly detect the vibration of identical range, therefore can only record or export the detection signal of a side in two piezoelectric sensors 140B, 140C.Further, the side in above-mentioned two piezoelectric sensors 140B, 140C such as also can not be set.

As discussed above, piano 11 according to the present embodiment, the height dimension of the path 130 of long bridge 114 (short bridge 115, short bridge pin 119) is less than the size of piezoelectric sensor 140, thus, piezoelectric sensor 140 is in the state being always compressed stress from the orientation of two dividing body 114A, 114B (115A, 115B, 119A, 119B) and the thickness direction of soundboard 112.Therefore, piezoelectric sensor 140 can be made a response relative to the vibration on the principal oscillation direction (thickness direction of soundboard 112) of soundboard 112, long bridge 114 (short bridge 115, short bridge pin 119) delicately.That is, the sensitivity that can realize the piezoelectric sensor 140 of the vibration of measuring on principal oscillation direction improves.Therefore, it is possible to high-grade ground detects the vibration of soundboard 112, long bridge 114 (short bridge 115, short bridge pin 119).

And, piano 11 according to the present embodiment, the width dimensions of path 130 is larger than the size of piezoelectric sensor 140, thus when utilizing two dividing body 114A, 114B (115A, 115B, 119A, 119B) to clip piezoelectric sensor 140, allow piezoelectric sensor 140 displacement in the direction of the width.Therefore, it is possible to reduce to utilize two dividing body 114A, 114B (115A, 115B, 119A, 119B) to clip the power of piezoelectric sensor 140, easily clamp piezoelectric sensor 140.

And, by reducing the power mutually pressing two dividing body 114A, 114B (115A, 115B, 119A, 119B), thus the load reduced dividing body 114A, 114B (115A, 115B, 119A, 119B), can suppress to occur exception on dividing body 114A, 114B (115A, 115B, 119A, 119B).

Further, piano 11 according to the present embodiment, groove 131 is only formed at the first dividing body 114A (115A, 119A).Therefore, when interfixing two dividing body 114A, 114B (115A, 115B, 119A, 119B), after piezoelectric sensor 140 being put into groove 131 with the opposed faces 114c of the first dividing body 114A (115A, 119A) state upward, only stack the second dividing body 114B (115B, 119B) from the top of the first dividing body 114A (115A, 119A).That is, when stacking second dividing body 114B (115B, 119B), do not need to carry out the location of the second dividing body 114B (115B, 119B) relative to piezoelectric sensor 140.Therefore, it is possible to easily and efficiently piezoelectric sensor 140 to be installed on long bridge 114 (short bridge 115, short bridge pin 119).

And, piano 11 according to the present embodiment, filling agent 135 is filled with in gap between path 130 and the piezoelectric sensor 140 being accommodated in wherein, therefore long bridge 114, short bridge 115, short bridge pin 119 based on string 117 vibration and when vibrating, can prevent piezoelectric sensor 140 from vibrating relative to long bridge 114, short bridge 115, short bridge pin 119.Therefore, it is possible to prevent piezoelectric sensor 140 from exporting from piezoelectric sensor 140 as undesired signal relative to the vibration of long bridge 114, short bridge 115, short bridge pin 119.That is, can from the high detection signal of piezoelectric sensor 140 output accuracy.

Further, piano 11 according to the present embodiment, filling agent 135 is bonding agents, therefore, it is possible to reduce the man-hour being used for piezoelectric sensor 140 being installed on long bridge 114, short bridge 115, short bridge pin 119.That is, piezoelectric sensor 140 can be installed on long bridge 114, short bridge 115, short bridge pin 119 efficiently.

In addition, piano 11 according to the present embodiment, the piezoelectric sensor 140A of long bridge 114 is divided into multiple sensor 140A1,140A2 to form, in identical long bridge 114, can carry out suitable vibration detection at each range.Further, the end of sensor 140A1,140A2 adjacent in piezoelectric sensor 140A overlaps each other configuration, therefore, it is possible to prevent the region of the long bridge 114 that piezoelectric sensor 140A can't detect.

Above, embodiments of the present invention A is illustrated in detail, but the present invention is not limited to above-mentioned embodiment, various change can be implemented without departing from the scope of the subject in the invention.

The section shape of groove 131 is not limited to rectangular-shaped, can be formed as arbitrary shape.Such as shown in Figure 7, the medial surface of groove 131 can be formed as from the bottom surface of groove 131 the section trapezoidal shape that opening upward tilts gradually laterally to groove 131.In addition, groove 131 such as shown in Figure 8, the bottom surface of groove 131 and the bight of the medial surface shape with fillet can be formed as, or, such as can be formed as the arc-shaped section corresponding with the oval-shaped profile of the piezoelectric sensor 140 of elastic deformation (with reference to Fig. 3,4 etc.).

Further, groove 131 such as only can be formed at the opposed faces of the second dividing body, also can be formed at the opposed faces of the first dividing body and the second dividing body two side.When groove 131 is only formed at the second dividing body, identical with the situation of above-mentioned embodiment, easily and efficiently on long bridge 114, short bridge 115, short bridge pin 119, piezoelectric sensor 140 can be installed.

Further, the groove (sulculus) less than groove 131 width can be such as formed with in the bottom surface of groove 131.In this case, the forming position of the sulculus on the width dimensions of sulculus and the bottom surface of groove 131, as long as the scope contributing to that in the bottom surface of groove 131 piezoelectric sensor 140 compresses in the orientation of two dividing bodies, can at random set.Further, the depth dimensions of sulculus also can be arbitrary.

Further, such as shown in Figure 9, piezoelectric sensor 140B can be arranged between short bridge 115 and connecting member 118.In this case, short bridge 115 and connecting member 118 is utilized to form the first transfer part 161.Further, connecting member 118 plays function as the first dividing body of the first transfer part 161, and short bridge 115 plays function as the second dividing body of the first transfer part 161.Form and insert the groove 131 of the path 130 of the inside of the first transfer part 161 such as piezoelectric sensor 140B, as shown in Figure 9, the lower surface (opposed faces) of the short bridge 115 opposed with connecting member 118 can be formed in, but be not limited thereto.

Further, piezoelectric sensor 140C such as shown in Figure 9, can be arranged between connecting member 118 and short bridge pin 119.In this case, connecting member 118 and short bridge pin 119 is utilized to form the second transfer part 162.Further, short bridge pin 119 plays function as the first dividing body of the second transfer part 162, and connecting member 118 plays function as the second dividing body of the second transfer part 162.Form and insert the groove 131 of the path 130 of the inside of the second transfer part 162 such as piezoelectric sensor 140C, the upper surface (opposed faces) of the short bridge pin 119 opposed with connecting member 118 can be formed in as illustrated in fig. 9, but be not limited thereto.

Further, piezoelectric sensor 140 can be such as be formed as banded flat cable type sensor.

Further, piezoelectric sensor 140 such as only can be arranged on any portion in long bridge 114, short bridge 115, short bridge pin 119 or any two parts.

Further, such as same piezoelectric sensor 140 can be set to be wound between two or three in long bridge 114, short bridge 115, short bridge pin 119.

The position being arranged at the groove 131 of long bridge 114 is not limited to the example shown in Fig. 3.

Figure 10 represents that the side 114s in long bridge 114 is provided with the example of the situation of groove 131.More specifically, groove 131 is arranged at the side 114As of the first dividing body 114A.More specifically, groove 131 is arranged at the bight of the first dividing body 114A be made up of side 114As and opposed faces 114c.Groove 131 forms the path 130 inserted for piezoelectric sensor 140A together with the opposed faces 114d of the second dividing body 114B.Structure shown in Figure 10 is except the different point in the position of groove 131, identical with the structure shown in Fig. 3.The example arranging the situation of groove 131 at the side 114s of long bridge 114 is not limited to the example shown in Figure 10.Groove 131 only can be arranged at the side 114Bs of the second dividing body.Groove 131 also can be arranged at side 114As, 114Bs of two sides of the first dividing body 114A and the second dividing body 114B.

When the side 114s of long bridge 114 is provided with groove 131, long bridge 114 can not be divided into the first dividing body 114A and the second dividing body 114B.That is, as shown in figure 11, long bridge 114 can not be split, groove 131 is set at the side 114s of long bridge 114.

Identical with the example shown in Fig. 9 and 10, groove 131 can be set in the side of short bridge 115, also groove 131 can be set in the side of short bridge pin 119.

And, embodiments of the present invention A can be applied to there is string 117 and via transfer part by the vibration passing of string 117 to the musical instrument of the structure of oscillating plate, such as, the various musical instruments such as stringed musical instrument such as other keyboard instrument, acoustic guitar, violin such as upright piano can be applied to.

A according to the embodiment of the present invention, inserts piezoelectric sensor between two dividing bodies, and by being fixed to one another these two dividing bodies, piezoelectric sensor is in the state being always compressed stress from the orientation of two dividing bodies and the thickness direction of oscillating plate.Therefore, piezoelectric sensor can be made a response delicately relative to transfer part and oscillating plate in the vibration on principal oscillation direction.That is, the sensitivity that can realize the piezoelectric sensor of the vibration of measuring on principal oscillation direction improves.Therefore, it is possible to high-grade ground detects the vibration of oscillating plate and transfer part.

(embodiment B)

Below, be described with reference to Figure 12 ~ 17 couple embodiments of the present invention B.One of object of embodiment B is to provide a kind of can not make that manufacture is too complicated, detect to high-grade the keyboard instrument of the vibration of string.In the present embodiment, one and the piano 21 of keyboard instrument is exemplified as musical instrument.

As shown in figure 12, the piano 21 of this embodiment is one and the grand piano of primary sound piano.In fig. 12, the diagram of top cover, string, keyboard etc. is omitted.Piano 21 possesses known basic structure and iron skeleton 211, soundboard (oscillating plate) 212, side plate 213, long bridge (bridge) 214, short bridge main body (bridge) 215, multiple stall bars 216, effective string support (support, the first dividing body, transfer part) 230 etc.Multiple stall bars 216 are fixed on the lower surface of soundboard 212 in parallel with each other.

Many strings 217 (with reference to Figure 14 ~ 16) are on the upper surface 212a of soundboard 212, and the utilization extension string be arranged on iron skeleton 211 is followed closely and tuning nail is established.

Long bridge 214, short bridge main body 215 are being clipped in the position between soundboard 212 and string 217.As shown in figure 14, long bridge 214 is fixed on the upper surface 212a of soundboard 212.As shown in figure 12, short bridge main body 215 can be fixed on the upper surface 212a of soundboard 212 via short bridge erecting bed 218 and short bridge pin 219, such as, also directly can be fixed on the upper surface 212a of soundboard 212 in the same manner as long bridge 214.

Like this, by arranging long bridge 214, short bridge main body 215, operated by performance, the vibration of the string 217 produced by hammer 220 (with reference to Figure 14) impact is delivered to soundboard 212 via long bridge 214, short bridge main body 215.

From the thickness direction top view of soundboard 212, long bridge 214, short bridge main body 215 are formed as banded.

Further, the length of short bridge main body 215 is shorter than long bridge 214.Observe from player side, long bridge 214, short bridge main body 215, short bridge pin 219 are towards treble side (being viewed as right side) from player side, close with oblique extension ventrally gradually.

In the present embodiment, above-mentioned soundboard 212, long bridge 214, short bridge main body 215, short bridge erecting bed 218, short bridge pin 219 etc. are wooden.Further, iron skeleton 211 is metal.

As shown in Figure 12,14 ~ 16, effective string support 230 extends in the mode of intersecting with the length direction of string 217 and supports many strings 217, determines the effectual chord length of string 217 together with long bridge 214 and short bridge main body 215.The part that the part of the effective string 217A in string 217 between effective string support 230 and long bridge 214 or short bridge main body 215 is impacted by hammer 220.Such as, as shown in figure 14, relative to same string 217, effective string support 230 can be pressed in the opposite direction with long bridge 214 or short bridge main body 215, such as, also effective string support 230 can be pressed with long bridge 214 or short bridge main body 215 to identical direction.Effective string support 230 of present embodiment is metal.In the present embodiment, the structure of effective string support 230 and high range string 217 and in the string 217 of low range different from each other.

Corresponding with the string 217 of high range first effective string support (transfer part) 230A utilizes a part for iron skeleton 211 to form.As shown in figure 14, first effective string support 230A possesses the first support main body 231A, at the first support main body 231A and the first bearing (contact site, the second dividing body) 232A contacted with string 217 between string 217.In the present embodiment, the string 217 of high range passes through the downside of iron skeleton 211, and therefore the first bearing 232A is positioned at the downside of the first support main body 231A.First effective string support 230A such as can be divided into multiple setting in the orientation of string 217 (in Figure 12 left and right directions), but in the present embodiment, as shown in figure 12, to support in the lump thus the mode of string 217 of high range only arrange one.

As shown in Figure 15,16, with in second effective string support (transfer part) 230B corresponding to the string 217 of low range be not arranged at string tuning button but be arranged on the upside of iron skeleton 211.In the present embodiment, in the string 217 of low range by the upside of iron skeleton 211, therefore second effective string support 230B with in the string 217 of low range be formed as arcuation (gate) by the mode between iron skeleton 211.Second effective string support 230B possesses the second support main body 231B being formed as arcuation, the second bearing (contact site) 232B contacted with string 217 between the second support main body 231B chord 217.In the present embodiment, the second bearing 232B is positioned at the downside of the second support main body 231B.Second effective string support 230B such as can support in the lump all in the mode of string 217 of low range only arrange one, but in the present embodiment, as shown in figure 12, can in low range many strings 217 orientation on be divided into multiple (in illustrated example, being two) to arrange.

Piano 21 possesses the piezoelectric sensor 240 of wire.Piezoelectric sensor 240 can the elastic deformation when being subject to external force from the direction orthogonal with its length direction.As shown in figure 13, the piezoelectric sensor 240 of present embodiment to be section be circular concentric cable type sensor, possess heart yearn 241, cladding core wire 241 outside piezoelectric element film 242, to be made up of braided wire and from outside the outer conductive layer 243 of further coated piezoelectric element film 242.The outside of outer conductive layer 243 is protected by the parcel 244 with electrical insulating property be made up of tygon etc.

Piezoelectric element film 242 is made up of piezoelectric type polymkeric substance (piezopolymer), between heart yearn 241 and outer conductive layer 243, play function as insulator.In piezoelectric sensor 240, piezoelectric element film 242 is compressed power or tractive force, thus produces the electric charge proportional with this stress.

As shown in Figure 12,14 ~ 16, piezoelectric sensor 240 is arranged at each effective string support 230.Observe from the thickness direction of soundboard 212, piezoelectric sensor 240 configures with the bearing of trend of the mode overlapping with effective string support 230 along effective string support 230.In the present embodiment, piezoelectric sensor 240 is arranged on effective string support 230 inside.

Then, with reference to Figure 14, the installation constitution of piezoelectric sensor 240A effective string support 230A relative to first is described.

First support main body 231A and the first bearing 232A of first effective string support 230A are separated from one another.Namely the first support main body 231A and the first bearing 232A is independently parts.The mode that first support main body 231A and the first bearing 232A contacts with each other with opposed faces 231c, the 232c of the first support main body 231A opposite each other and the first bearing 232A is fixed.First support main body 231A and the first bearing 232A such as can utilize the first support main body 231A and string 217 are clipped in the middle by first bearing 232A and fix, such as, bonding agent (not shown) also can be utilized to fix.

When not using bonding agent to fix the first support main body 231A and the first bearing 232A, such as, the location division that suppression first support main body 231A and the first bearing 232A staggers in the direction orthogonal with their orientation is preferably provided with.Location division such as, preferably utilize be formed at the first support main body 231A opposite each other and opposed faces 231c of the first bearing 232A, a side of 232c jut and be formed at these opposed faces 231c, 232c the opposing party and form for the patchhole that jut inserts.

The groove 233A extended on the bearing of trend of first effective string support 230A is formed at the opposed faces 232c of the first bearing 232A.Groove 233A is throughout the formation endlong of first effective string support 230A.Piezoelectric sensor 240A is accommodated in groove 233A endlong throughout groove 233A, and is sandwiched between the first support main body 231A and the first bearing 232A.In addition, be fixed to one another by the first support main body 231A and the first bearing 232A, piezoelectric sensor 240A imbeds between the first support main body 231A and the first bearing 232A.In this condition, piezoelectric sensor 240A contacts with the inside surface of groove 233A and the opposed faces 231c of the first support main body 231A always, and is compressed stress from outer circumferential side always.

The section shape of groove 233A is not limited to the shape comprising circular arc like that shown in Figure 14, under the state being fixed to one another at least the first support main body 231A and the first bearing 232A, as long as piezoelectric sensor 240A is compressed the shape of stress from outer circumferential side always, then it can be arbitrary shape.That is, the section shape of groove 233A can be the polygon such as triangle or quadrilateral.

As shown in Figure 15,16, the installation constitution of piezoelectric sensor 240B effective string support 230B relative to second is identical with the installation constitution of piezoelectric sensor 240A effective string support 230A relative to first.

That is, the second support main body 231B of second effective string support 230B and the second bearing 232B is separated from one another.That is, the second support main body 231B and the second bearing 232B is independently parts.Second support main body 231B and the second bearing 232B, such as the second bearing 232B can be clipped between the second support main body 231B and string 217 and fix, such as, also can be fixed by bonding agent.

Further, the groove 233B same with the first bearing 232A is formed with at the opposed faces 232d of the second bearing 232B.Piezoelectric sensor 240B is accommodated in groove 233B, and imbeds between the second support main body 231B and the second bearing 232B.In this condition, piezoelectric sensor 240B contacts with the inside surface of groove 233B and the opposed faces 231d of the second support main body 231B always, and is compressed stress from outer circumferential side always.

In present embodiment, second effective string support 230B is divided into two settings, and therefore piezoelectric sensor 240B is also divided into two piezoelectric sensors 240B1,240B2 to arrange.

In addition, in the present embodiment, as shown in figure 12, piezoelectric sensor 240C, 240D, 240E are also arranged at long bridge 214, short bridge main body 215, short bridge pin 219.Identical with the situation of effective string support 230A, 230B, observe from the thickness direction of soundboard 212, each piezoelectric sensor 240C, 240D, 240E configure with the bearing of trend of the mode overlapping with long bridge 214, short bridge main body 215, short bridge pin 219 along long bridge 214, short bridge main body 215, short bridge pin 219.Identical with the situation of effective string support 230A, 230B, these piezoelectric sensors 240C, 240D, 240E such as can be arranged on the inside of long bridge 214, short bridge main body 215, short bridge pin 219, such as also can be arranged on long bridge 214, between short bridge pin 219 and soundboard 212 (with reference to Figure 14), between short bridge main body 215 and short bridge erecting bed 218.

In the piano 21 of the present embodiment formed as above, if when each effective string support 230A, 230B displacement due to the vibration of string 217, vibration, the compression stress acting on piezoelectric sensor 240A, the 240B arranged at each effective string support 230A, 230B changes, and namely piezoelectric sensor 240A, 240B makes a response.And, when soundboard 212, long bridge 214, short bridge main body 215, the displacement due to the vibration of string 217 of short bridge pin 219, vibration, the compression stress acting on piezoelectric sensor 240C, 240D, the 240E arranged at long bridge 214, short bridge main body 215, short bridge pin 219 changes, and namely piezoelectric sensor 240C, 240D, 240E makes a response.And, by the reaction of these piezoelectric sensors 240A ~ 240E, from each piezoelectric sensor 240A ~ 240E output detections signal.

From be arranged on effective string support 230A, 230B piezoelectric sensor 240A, 240B export detection signal such as, as shown in figure 17, respectively as voice data record in recording unit 251, or externally export as voice signal.The reproduction etc. of sound is used at the voice data of recording unit 251 record.The detection signal of these multiple piezoelectric sensor 240A, 240B such as, as shown in figure 17, externally can export, but such as also can independently export after mixer 252 mixes.In addition, the detection signal of multiple piezoelectric sensor 240A, 240B such as, as shown in figure 17, can output to recording unit 251 independently, but such as also can output to recording unit 251 after mixer 252 mixes.Further, the detection signal of piezoelectric sensor 240A, 240B such as, as shown in figure 17, after can amplifying in amplifier 253, records or exports.Amplifier 253 such as, as shown in figure 17, can amplify the detection signal exported from multiple piezoelectric sensor 240A, 240B independently, but such as also can be amplified in the mixed signal of mixer 252.

For from be arranged at long bridge 214, short bridge main body 215, short bridge pin 219 piezoelectric sensor 240C, 240D, 240E export detection signal, do not illustrate especially, treat in the same manner as the detection signal that piezoelectric sensor 240A, 240B of being arranged at effective string support 230A, 230B export.In addition, two piezoelectric sensors 240D, 240E being arranged at short bridge main body 215 and short bridge pin 219 mainly detect the vibration of identical range, therefore can only record or export the detection signal of a side in these two piezoelectric sensors 240D, 240E.Further, a side of above-mentioned two piezoelectric sensors 240D, 240E such as can not be set.

And, from be arranged at long bridge 214, short bridge main body 215, short bridge pin 219 piezoelectric sensor 240C, 240D, 240E export detection signal, such as, externally export after can mixing with the detection signal exported from piezoelectric sensor 240A, 240B of being arranged at effective string support 230A, 230B, also can export independently.

As discussed above, piano 21 according to the present embodiment, utilizes piezoelectric sensor 240A, the 240B being arranged at effective string support 230A, 230B to detect the vibration of string 217, is therefore difficult to pick up sound around.Further, because piezoelectric sensor 240A, 240B are for the sensitivity equalization of the position of the bearing of trend of effective string support 230A, 230B, therefore compared with existing sound pick up equipment, the irregular of accuracy of detection can easily be suppressed.In addition, piezoelectric sensor 240A, 240B of being arranged at effective string support 230A, 230B are for the detection of vibration compared with existing sound pick up equipment, and singing is strong, and S/N is better than also.

Therefore, it is possible to high-grade ground detects the vibration of string 217, namely compared with the past, singing, sound that noise is little can be detected.

In addition, the product of commercial type can be used in as piezoelectric sensor 240A, 240B, further, the quantity of piezoelectric sensor 240A, 240B arranged in piano 21 will be lacked compared with the quantity of existing sound pick up equipment, therefore, it is possible to manufacturing cost suppressed at comparatively low degree.

Further, can the quantity of piezoelectric sensor 240A, 240B of arranging in piano 21 being suppressed less, in addition, not needing the man-hour for suppressing accuracy of detection irregular as in the past, therefore, it is possible to suppress less by the man-hour of manufacture.

As from the foregoing, piano 21 according to the present embodiment, can not make manufacture complicated, and high-grade ground detects the vibration of string 217.

And, effective string support 230A, 230B can not play the function of being sounded to soundboard 212 by the vibration passing of string 217 as long bridge 214 and short bridge main body 215 etc., therefore, compared with long bridge 214, short bridge main body 215 etc., can piezoelectric sensor 240A, 240B be easily set.

In addition, piano 21 according to the present embodiment, piezoelectric sensor 240A, 240B are arranged on the inside of effective string support 230A, 230B, and piezoelectric sensor 240A, 240B does not contact with string 217 thus.Therefore, it is possible to prevent the vibration characteristics of string 217 from changing because of piezoelectric sensor 240A, 240B.Therefore, it is possible to the quality of the sound preventing the vibration passing of string 217 from producing to soundboard 212 changes due to the setting of piezoelectric sensor 240A, 240B.Further, compared with situation about contacting with piezoelectric sensor 240A, 240B and string 217, the elastic deformation of piezoelectric sensor 240A, 240B does not affect the tension force of string 217.Therefore, it is possible to while arrange piezoelectric sensor 240A, 240B, easily adjust the tension force of string 217 and the pitch of string 217.

Further, piano 21 according to the present embodiment, piezoelectric sensor 240A, 240B imbed each effective string support 230A, 230B support main body 231A, 231B and between bearing 232A, 232B.Thus, after support main body 231A, 231B opposite each other and the opposed faces 231c of bearing 232A, 232B, a side of 231d, 232c, 232d arrange piezoelectric sensor 240A, 240B, by means of only being fixed to one another support main body 231A, 231B and bearing 232A, 232B, just can simply at support main body 231A, 231B and effectively imbed piezoelectric sensor 240A, 240B between string support 230A, 230B.That is, easily piezoelectric sensor 240A, 240B can be installed on effective string support 230A, 230B.

In addition, piano 21 according to the present embodiment, groove 233A, 233B of storage piezoelectric sensor 240A, 240B are only formed at opposed faces 232c, the 232d of bearing 232A, 232B.

Therefore, after making piezoelectric sensor 240A, 240B be accommodated in groove 233A, 233B with the opposed faces 232c of bearing 232A, 232B, 232d state upward, by stacking support main body 231A, 231B from top, can prevent piezoelectric sensor 240A, 240B and groove 233A, 233B position from offseting.Further, when stacking support main body 231A, 231B, the location of carrying out piezoelectric sensor 240A, 240B is not needed.Therefore, it is possible to easily and efficiently install piezoelectric sensor 240A, 240B relative to each effective string support 230A, 230B.

And, piano 21 according to the present embodiment, a part piezoelectric sensor 240A, 240B are arranged at metal effective string support 230A, 230B, and remaining piezoelectric sensor 240C, 240D, 230E are arranged at wooden long bridge 214, short bridge main body 215 etc.Therefore, piezoelectric sensor 240A, 240B of being arranged at effective string support 230A, 230B and piezoelectric sensor 240C, 240D, 230E of being arranged at long bridge 214, short bridge main body 215 etc. different in the mode of the compression stress of piezoelectric sensor 240A ~ 230E at the effect of vibration based on string 217.That is, the characteristic of sound externally exported based on the detection signal exported from piezoelectric sensor 240A, 240B of being arranged at effective string support 230A, 230B is different from the characteristic of the sound externally exported based on the detection signal exported from piezoelectric sensor 240C, 240D, 230E of being arranged at long bridge 214, short bridge main body 215 etc.

Therefore, at the detection signal exported from piezoelectric sensor 240A, 240B of being arranged at effective string support 230A, 230B and when externally exporting after the mixing such as mixer 252 from the detection signal that piezoelectric sensor 240C, 240D, 230E of being arranged at long bridge 214, short bridge main body 215 etc. export, the sound of the degree of depth more can be had.Further, can vibrate close to soundboard 212 grade by piano 21 and the tone color of the primary sound sound of generation.

Above, embodiments of the present invention B is illustrated in detail, but the present invention is not limited to above-mentioned embodiment, without departing from the scope of spirit of the present invention, various change can be implemented.

Groove 233A, 233B of effective string support 230A, 230B of storage piezoelectric sensor 240A, 240B are such as, as shown in figure 18, only can be formed at support main body 231A, the opposed faces 231c of 231B, 231d, such as, also can be formed at support main body 231A, 231B and bearing 232A, 232B two opposed faces 231c of side, 231d, 232c, 232d.When groove 233A, 233B are only formed at support main body 231A, 231B, identical with the situation of above-mentioned embodiment, easily and efficiently relative to effective string support 230A, 230B, piezoelectric sensor 240A, 240B can be installed.

Further, piezoelectric sensor 240A, 240B of being arranged at effective string support 230A, 230B such as can be arranged on support main body 231A, the inside of 231B or the inside of bearing 232A, 232B.In this case, such as, support main body 231A, 231B or bearing 232A, 232B can be divided into two dividing bodies, and piezoelectric sensor 240A, 240B are imbedded between two dividing bodies.Further, in this case, support main body 231A, the 231B of each effective string support 230A, 230B and bearing 232A, 232B can unlike above-mentioned embodiment Ground Split, can be integrally formed.

Further, such as, can arrange with reeling a piezoelectric sensor 240B relative to be divided into two to arrange second effective string support 230B.Further, such as, same piezoelectric sensor 240 also can to arrange throughout the mode of first, second effective string support 230A, 230B two side's winding.

In addition, piezoelectric sensor 240 such as can be arranged at long bridge 214, short bridge main body 215, any portion of short bridge pin 219 or any two parts.Further, piezoelectric sensor 240 such as can not be arranged at long bridge 214, short bridge main body 215, short bridge pin 219.

Further, piezoelectric sensor 240 is such as be formed as banded flat cable type sensor.

Further, embodiments of the present invention B is not limited to grand piano, also can be applicable to other keyboard instruments such as upright piano.

B according to the embodiment of the present invention, can not make manufacture too complicated, and high-grade ground detects the vibration of string.

Claims (8)

1. a keyboard instrument, is characterized in that, possesses:

String;

Transmit the transfer part of the vibration of described string;

Bearing of trend along described transfer part configures, detects via described transfer part the piezoelectric sensor of the vibration of described string.

2. keyboard instrument according to claim 1, is characterized in that,

Described piezoelectric sensor is arranged on the inside of described transfer part.

3. keyboard instrument according to claim 2, is characterized in that,

Described transfer part is segmentation.

4. the keyboard instrument according to any one of claims 1 to 3, is characterized in that,

Described transfer part has the path receiving described piezoelectric sensor,

The size of described path is less than the size of described piezoelectric sensor.

5. keyboard instrument according to claim 4, is characterized in that,

For the Width orthogonal with the length direction of described piezoelectric sensor, the size of described path is larger than the size of described piezoelectric sensor.

6. keyboard instrument according to claim 3, is characterized in that,

Described transfer part has the first dividing body independent of each other and the second dividing body,

A side is only had to have the groove receiving described piezoelectric sensor in described first dividing body and described second dividing body.

7. the keyboard instrument according to any one of claim 2, claim 3 and claim 6, is characterized in that,

Described transfer part has the path receiving described piezoelectric sensor,

Filling agent is filled with in gap between described path and described piezoelectric sensor.

8. keyboard instrument according to claim 7, is characterized in that,

Described filling agent is bonding agent.