JP6197556B2 - Stringed instrument pickup device - Google Patents

Description

  The present invention relates to a pickup device that picks up vibration of a string of a stringed instrument such as a guitar.

  Various pickup devices have been proposed for picking up vibration of one string by a plurality of piezoelectric elements arranged between a saddle and a piece (often called a bridge in the case of a guitar). For example, in the pickup device disclosed in Patent Document 1, a flexible circuit board is bonded to the top surface of a guitar bridge, and two piezoelectric elements are arranged on the flexible circuit board along the longitudinal direction of the string. Has been. The saddle supporting the string transmits the vibration of the string to the two piezoelectric elements. According to this pickup device, the vibration of one string is transmitted to the two piezoelectric elements via the saddle, and various components of the string vibration can be extracted from the output signals of the two piezoelectric elements.

JP 2001-356774 A

  By the way, the conventional pickup device described above has a problem that the pressure applied to one piezoelectric element is easily transmitted to an adjacent piezoelectric element through a piece or the like, and it is difficult to obtain a pickup signal that accurately reflects string vibration. It was.

  The present invention has been made in view of such problems, and can prevent the pressure applied to one piezoelectric element from being transmitted to an adjacent piezoelectric element via a piece or the like, thereby accurately detecting string vibration. It is an object of the present invention to provide a pickup device that can obtain a reflected pickup signal.

  According to the present invention, in a pickup device for a stringed instrument that picks up vibrations of a string with a piezoelectric element disposed between a saddle and a piece that support the string, a plurality of piezoelectric elements are provided for one string, and the plurality of piezoelectric elements are provided. A plurality of first convex portions that individually face each of the elements from the saddle side, and a plurality of second convex portions that individually face each of the plurality of piezoelectric elements from the piece side, There is provided a pickup device for a stringed instrument, characterized in that the piezoelectric element is sandwiched between the first convex portion and the second convex portion.

  According to the present invention, each of the plurality of piezoelectric elements is sandwiched from above and below by the separate first and second convex portions between the saddle and the piece, so that the force transmitted to each piezoelectric element is adjacent to the piezoelectric element. Propagation to the element can be prevented.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing a configuration of a guitar provided with a pickup device according to a first embodiment of the present invention. It is a perspective view which shows the structure of the saddle of the pickup apparatus. It is sectional drawing which shows the structure which cut | disconnected the pick-up apparatus by the plane perpendicular | vertical to a string. It is a top view which shows the layout of the signal wiring surface of the lower flexible board | substrate of the said pick-up apparatus. It is a figure explaining the coordinate axis assumed when isolate | separating the vibration of a string into an axial direction component in the embodiment. It is a figure explaining the principle which isolate | separates the vibration of a string into an axial direction component in the embodiment. It is a figure which shows the effect of the same embodiment. It is a figure which shows the other effect of the same embodiment. It is sectional drawing which shows the structure which cut | disconnected the pick-up apparatus which is 2nd Embodiment of this invention by the plane perpendicular | vertical to a string. It is a perspective view which shows the structure of the saddle used in each embodiment after 2nd Embodiment of this invention. It is sectional drawing which shows the structure which cut | disconnected the pick-up apparatus which is 3rd Embodiment of this invention by the plane perpendicular | vertical to a string. It is sectional drawing which shows the structure which cut | disconnected the pick-up apparatus which is 4th Embodiment of this invention by the plane perpendicular | vertical to a string. It is sectional drawing which shows the structure which cut | disconnected the pick-up apparatus which is 5th Embodiment of this invention by the plane perpendicular | vertical to a string. It is sectional drawing which shows the structure which cut | disconnected the pick-up apparatus which is 6th Embodiment of this invention by the plane perpendicular | vertical to a string. It is sectional drawing which shows the structure which cut | disconnected the pick-up apparatus which is 7th Embodiment of this invention by the plane perpendicular | vertical to a string.

Embodiments of the present invention will be described below with reference to the drawings.
<First Embodiment>
FIG. 1 is an external view of a guitar (electric acoustic guitar) 10 provided with a pickup device according to the first embodiment of the present invention.

  The guitar 10 includes a torso 11, a fingerboard 12, and a head 13. A piece 14 is fixed on the upper surface of the trunk 11. Six strings 15 are stretched between the piece 14 and the head 13. The six strings 15 are supported by a pickup device 20 provided on the piece 14.

  FIG. 2 is a perspective view illustrating a configuration example of the saddle 22 in the pickup device 20. As shown in FIG. 2, the saddle 22 has a regular quadrangular pyramid shape, and has a groove 22b for receiving the string 15 at a position corresponding to the apex of the regular quadrangular pyramid. The pickup device 20 has six saddles 22, and the six strings 15 are supported by the six saddles 22.

  FIG. 3 is a cross-sectional view showing a configuration in which the pickup device 20 is cut along a plane orthogonal to the string 15. In FIG. 3, only the portion of the pickup device 20 that picks up the two strings 15 is shown in order to prevent the drawing from becoming complicated.

  As shown in FIG. 3, the pickup device 20 includes a high-rigidity block 31, an upper flexible substrate 32, a piezoelectric member between the lower surface of each saddle 22 that supports the six strings 15 and the upper surface of the piece 14. The element 33, the lower flexible substrate 34, and the high-rigidity block 35 are sandwiched. The piezoelectric element 33 is sandwiched between the high-rigidity block 31 and the high-rigidity block 35 via the upper flexible substrate 32 or the lower flexible substrate 34. The saddle 22 may be made of synthetic resin, ivory, bovine bone, or the like having a relatively low Young's modulus, and preferably a urea-based resin. Further, as the high-rigidity block 31 or the high-rigidity block 35, it is preferable to use a block made of metal or ceramic. The metal may be, for example, nickel, iron, copper, or an alloy thereof, or may have increased rigidity by heat treatment. As the ceramic, for example, alumina, zirconia, aluminum nitride or the like can be used. Here, the high-rigidity block 31 or the high-rigidity block 35 may be a conductor or an insulator. Further, it is desirable that the high rigidity block 31 and the high rigidity block 35 have higher rigidity than the saddle 22 and the piezoelectric element 33.

  Each piezoelectric element 33 is an element that outputs a voltage corresponding to a stress in the thickness direction. In FIG. 3, the direction between the saddle 22 and the piece 14 (that is, the vertical direction) is the thickness direction of each piezoelectric element 33.

  Four high-rigidity blocks 31, piezoelectric elements 33, and high-rigidity blocks 35 are provided for each saddle 22. Focusing on one saddle 22, four high-rigidity blocks 31 are fixed to four corners of the square bottom surface of the saddle 22, respectively. The four piezoelectric elements 33 and the four high-rigidity blocks 35 occupy the respective regions immediately below the four high-rigidity blocks 31. That is, the high rigidity block 31, the piezoelectric element 33, and the high rigidity block 35 occupy a common area on the piece 14.

  In the configuration shown in FIG. 3, the plurality of high-rigidity blocks 31 fixed to the lower surfaces of the plurality of saddles 22 are separately provided on the plurality of piezoelectric elements 33 from the saddle 22 side toward the piece 14 side. It functions as a vibration transmission unit that transmits vibration from the string 15. At this time, it is considered that the plurality of high-rigidity blocks 31 urge the plurality of piezoelectric elements 33 by the tension of the string 15. Further, the plurality of high-rigidity blocks 35 disposed on the piece 14 function as support portions that individually support each of the plurality of piezoelectric elements 33 from the piece 14 side toward each saddle 22 side. At this time, similarly to the plurality of high-rigidity blocks 31, the plurality of high-rigidity blocks 35 may be considered to bias the plurality of piezoelectric elements 33 by the tension of the string 15. The plurality of high-rigidity blocks 35 sandwich the plurality of piezoelectric elements 33 together with the plurality of high-rigidity blocks 31.

  The lower surface of the upper flexible substrate 32 is a ground surface 32a having a ground electrode formed on the entire surface. Each piezoelectric element 33 has one electrode in contact with the ground plane 32a. The upper flexible substrate 32 serves to ground one electrode of each piezoelectric element 33 and also serves as a shield.

  The lower surface of the lower flexible substrate 34 is a ground surface 34a on which the ground electrode is formed over the entire surface. The ground plane 34a serves as a shield. The lower flexible substrate 34 has the ground contact surface 34 a placed on the high-rigidity block 35. The upper surface of the lower flexible substrate 34 is a signal wiring surface 34b on which the signal wiring pattern shown in FIG. 4 is formed.

  As shown in FIG. 4, four signal electrodes 40_1, 40_2, 40_3, and 40_4 are provided on the signal wiring surface 34b for one saddle 22 (one string 15). The electrode surfaces of the four piezoelectric elements 33 are placed on and electrically connected to the signal electrodes 40_1, 40_2, 40_3, and 40_4. Further, four signal wirings 41, 42, 43 and 44 are formed on the signal wiring surface 34b in a direction crossing the string 15. Six signal electrodes 40_1 (only two of which are shown in FIG. 4; the same applies hereinafter) corresponding to the six saddles are connected to the signal wiring 41, and the six signal electrodes 40_2 include six signal wirings 42, six. The signal electrode 40_3 is connected to the signal wiring 43, and the six signal electrodes 40_4 are connected to the signal wiring 44, respectively. The signal wirings 41 to 44 are connected to a signal processing circuit (not shown). This signal processing circuit processes the output signals of the four piezoelectric elements 33 obtained from the signal electrodes 40_1, 40_2, 40_3, and 40_4 to generate a pickup signal. In FIG. 4, the same type of electrodes are connected by signal wiring, but may be wiring separated for each saddle.

  The contents of the signal processing performed by this signal processing circuit are as follows. First, an X axis, a Y axis, and a Z axis having relative directions as shown in FIG. 5 are assumed for the signal electrodes 40_1, 40_2, 40_3, and 40_4. In FIG. 5, the position of each signal electrode is indicated only by the number i of the signal electrode 40 — i in order to prevent the drawing from becoming complicated. As shown in FIG. 5, the X axis is an axis parallel to the guitar string 15 (see FIG. 1), and the Y axis is a direction orthogonal to the string 15 in the plane including the signal electrodes 40_i (i = 1 to 4). The Z axis is an axis orthogonal to the plane including the signal electrode 40 — i (i = 1 to 4). In the present embodiment, the vibration of the string 15 is separated into an X-axis component, a Y-axis component, and a Z-axis component and extracted by synthesizing the output signals of the signal electrodes 40 — i (i = 1 to 4).

  Here, with reference to FIGS. 6A to 6F, the separation and extraction process of each component of the vibration of the string 15 will be described. 6A shows the saddle 22 and the signal electrodes 40_i (i = 1 to 4) viewed from the Y-axis direction, and FIG. 6B shows the saddle 22 and the signal electrodes 40_i (i = 1 to 4) upward. It is the figure seen from. In FIG. 6A, the high-rigidity block 31, the upper flexible substrate 32, the lower flexible substrate 34, and the high-rigidity block 35 are not shown in order to prevent the drawing from becoming complicated. Yes. The same applies to FIGS. 6C and 6E described later. In FIG. 6A, the force component in the X-axis direction applied to the string 15 lifts the lower surface of the saddle 22 facing the piezoelectric elements 33 on the signal electrodes 40_2 and 40_4 upward, and on the signal electrodes 40_1 and 40_3. The lower surface of the saddle 22 facing each piezoelectric element 33 is pushed downward.

  6C shows the saddle 22 and the signal electrode 40_i (i = 1 to 4) viewed from the X-axis direction, and FIG. 6D shows the saddle 22 and the signal electrode 40_i (i = 1 to 4). It is the figure which looked at from the upper part. In FIG. 6C, the force component in the Y-axis direction applied to the string 15 lifts the lower surface of the saddle 22 facing the piezoelectric elements 33 on the signal electrodes 40_1 and 40_2 upward, and on the signal electrodes 40_3 and 40_4. The lower surface of the saddle 22 facing each piezoelectric element 33 is pushed downward.

  6E shows the saddle 22 and the signal electrode 40_i (i = 1 to 4) viewed from the Y-axis direction, and FIG. 6F shows the saddle 22 and the signal electrode 40_i (i = 1 to 4). It is the figure which looked at from the upper part. In FIG. 6E, the force component in the −Z-axis direction (downward) applied to the string 15 is applied to the lower surface of the saddle 22 facing each piezoelectric element 33 on all the signal electrodes 40 — i (i = 1 to 4). Press down.

Therefore, the signal processing circuit according to the present embodiment is configured to apply the pressure value PX in the X axis direction, the pressure value PY in the Y direction, and the pressure value in the Z axis direction applied to the string 15 from the output signal of the signal electrode 40_i (i = 1 to 4). A pickup signal indicating PY is generated. Here, the pressure value Pi (i = 1 to 4) indicated by the output signal of the signal electrode 40_i (i = 1 to 4), the pressure value PX in the X-axis direction indicated by the pickup signal of the signal processing circuit, and the pressure in the Y direction. The relationship between the value PY and the pressure value PZ in the Z-axis direction is as follows.
PX = P1-P2 + P3-P4 (1)
PY = P1 + P2-P3-P4 (2)
PZ = P1 + P2 + P3 + P4 (3)
The above is the details of the configuration of the pickup device 20 according to the present embodiment.

  In order to obtain a pickup signal that accurately indicates the pressure values PX, PY, and PZ, it is necessary to accurately transmit the vibration of one string 15 to the four piezoelectric elements 33 without receiving interference from others. There is. In the present embodiment, a plurality of piezoelectric elements 33 are sandwiched between the upper flexible substrate 32 and the lower flexible substrate 34, and the upper flexible substrate 32 and the lower flexible substrate 34 having flexibility are provided. Thus, the four piezoelectric elements 33 are not interfered with each other. Further, the plurality of high-rigidity blocks 31 protruding from the lower surfaces of the plurality of saddles 22 are individually in contact with each of the plurality of piezoelectric elements 33 via the upper flexible substrate 32 from the saddle 22 side toward the piece 14 side. Yes. Further, a plurality of high-rigidity blocks 35 projecting from the upper surface of the piece 14 are individually supported on each of the plurality of piezoelectric elements 33 via the lower flexible substrate 34 from the piece 14 side toward each saddle 22 side. Touching. That is, the plurality of piezoelectric elements 33 are biased by the plurality of piezoelectric elements 33 being sandwiched by the plurality of high rigidity blocks 31 and the plurality of high rigidity blocks 35. For this reason, according to this embodiment, the vibration of the string 15 can be accurately transmitted to the four piezoelectric elements 33 without receiving interference from others. In this case, the plurality of saddles 22, the plurality of high-rigidity blocks 31, the upper flexible substrate 32, the plurality of piezoelectric elements 33, the lower flexible substrate 34, the plurality of high-rigidity blocks 35, and the piece 14 are made of an adhesive or the like. It may be joined, it may join only a required interface, and it does not need to join. Hereinafter, this effect will be described with reference to FIGS.

  In the example shown in FIG. 7, a force in the Y-axis direction is applied to the chord 15 supported by the right saddle 22 in the drawing, and the right saddle 22 pushes down the left area on the lower surface and lifts the right area. . However, since the upper flexible substrate 32 bends in the section between the left saddle 22 and the right saddle 22, the pressure in the left region on the lower surface of the right saddle 22 is impaired by the left saddle 22. Instead, it is transmitted to the piezoelectric element 33 immediately below the region.

  Further, in the saddle 22 on the right side in the figure, the left region on the lower surface is pushed down, while the right region is lifted. However, since the upper flexible substrate 32 bends in a section near the center of the lower surface of the saddle 22, the pressure in the region on the left side of the lower surface of the saddle 22 (positive pressure) and the pressure in the region on the right side of the lower surface of the saddle 22 ( (Negative pressure) is transmitted to each piezoelectric element 33 without interfering with each other.

  Even if the left region on the lower surface of the right saddle 22 is pushed down, the upper flexible substrate 32 bends, so that the pressure in the region is adjacent to the piezoelectric element 33 immediately below the region. Can be avoided. Similarly, even if the right region on the lower surface of the right saddle 22 is lifted, the upper flexible substrate 32 bends, so that the pressure (negative pressure) in the region is the piezoelectric element 33 immediately below the region. And transmission to the adjacent piezoelectric element 33 can be avoided. Therefore, crosstalk can be prevented.

  In the present embodiment, the upper flexible substrate 32 and the lower flexible substrate 34 that are soft are used, and the high-rigidity block 35 is interposed between each piezoelectric element 33 and the piece 14. Therefore, the crosstalk between the piezoelectric elements 33 via the piece 14 can be reduced.

  More specifically, as shown in FIG. 8, since the pressure transmitted from the saddle 22 to the piezoelectric element 33 is transmitted from the piezoelectric element 33 to the entire piece 14, the piece 14 is bent. If each piezoelectric element 33 is fixed to the piece 14, the bending of the piece 14 is transmitted to each piezoelectric element 33, and each piezoelectric element 33 is bent. The bending of each piezoelectric element 33 causes each piezoelectric element 33 to generate an approximately in-phase output. As a result, crosstalk occurs between the piezoelectric elements 33 via the piece 14.

  However, in this embodiment, the upper flexible substrate 32 and the lower flexible substrate 34 that are soft are used, and between the piezoelectric elements 33 and the pieces 14, they protrude from the pieces 14 toward the saddle 22 side. A high-rigidity block 35 serving as two convex portions is interposed. For this reason, even if the piece 14 is bent, the high-rigidity block 35 is not bent. Therefore, it is possible to prevent each piezoelectric element 33 from being bent by vibration of the string 15 and to prevent crosstalk due to the bending of the piece 14 between the adjacent piezoelectric elements 33.

  Although the case where the force in the Y-axis direction is applied to the string 15 has been described above, the same applies to the case where the force in the X-axis direction is applied.

As described above, according to the present embodiment, when the string 15 supported by the saddle 22 vibrates, the crosstalk is generated between the adjacent piezoelectric elements 33 without being disturbed by the other saddle 22. In addition, the vibration of the string 15 can be accurately detected by the four piezoelectric elements 33 under the saddle 22.
Further, according to the present embodiment, the grounding surface 32a of the upper flexible substrate 32 and the grounding surface 34a of the lower flexible substrate 34 serve as shields that cover all the piezoelectric elements 33, so that external noise is added to the pickup signal. It is possible to prevent overlapping.

Second Embodiment
FIG. 9 is a cross-sectional view showing a configuration in which the pickup device according to the second embodiment of the present invention is cut by a plane perpendicular to the string 15. In FIG. 9, the same reference numerals are used for elements common to the elements shown in FIG. 3 (first embodiment), and the description thereof is omitted. In the present embodiment, a saddle 22A shown in FIG. 10 is used instead of the saddle 22 (see FIG. 2) of the first embodiment. The saddle 22A has four leg portions 22a, 22c, 22e and 22f protruding downward from the four corners of the square bottom surface. In addition, with the adoption of the saddle 22A, the high-rigidity block 31 in the first embodiment is deleted in the present embodiment. In the present embodiment, the leg portions 22a, 22c, 22e, and 22f of the saddle 22A protrude from the saddle 22A side toward the piece 14 side so that each of the plurality of piezoelectric elements 33 protrudes and contacts separately. Function as. Also in this embodiment, the same effect as the first embodiment can be obtained.

<Third Embodiment>
FIG. 11 is a cross-sectional view showing a configuration in which the pickup device according to the third embodiment of the present invention is cut along a plane perpendicular to the string 15. In FIG. 11, the same reference numerals are used for elements common to those shown in FIG. 9 (second embodiment), and description thereof is omitted. In the present embodiment, the high-rigidity block 35 in the second embodiment is deleted. Instead, in this embodiment, a piece 14A having a convex portion 14B is provided in the region occupied by the high-rigidity block 35 in the second embodiment, that is, in the lower region of each piezoelectric element 33. In the present embodiment, the protrusions 14B of the piece 14A function as a plurality of second protrusions that protrude from the piece 14A side toward the saddle 22A side and individually contact each of the plurality of piezoelectric elements 33. Also in this embodiment, the same effect as the first embodiment can be obtained. Moreover, according to this embodiment, in the piece 14A, each convex part 14B to which the pressure of each piezoelectric element 33 is transmitted is separated by the concave part therebetween. For this reason, the crosstalk between the piezoelectric elements 33 can be reduced by reducing the deflection of the upper surface of each convex portion 14B. The material of the piece 14 is preferably hard wood, such as rosewood or ebony.

<Fourth embodiment>
FIG. 12 is a cross-sectional view showing a configuration in which the pickup device according to the fourth embodiment of the present invention is cut along a plane perpendicular to the strings. In FIG. 12, the same reference numerals are used for elements common to the elements shown in FIG. 11 (third embodiment), and the description thereof is omitted. In the present embodiment, in this piece 14A, in addition to the lower regions of the plurality of piezoelectric elements 33, two convex portions 14B are provided at positions at both ends of the pickup device in the arrangement direction of the strings 15. Then, both end portions of the lower flexible substrate 34 are placed on the two convex portions 14B. According to the present embodiment, in addition to the same effects as in the third embodiment, an effect that the lower flexible substrate 34 can be easily fixed is obtained.

<Fifth Embodiment>
FIG. 13 is a cross-sectional view showing a configuration in which a pickup device according to a fifth embodiment of the present invention is cut along a plane perpendicular to the strings. In FIG. 13, the same reference numerals are used for elements common to those shown in FIG. 12 (fourth embodiment), and the description thereof is omitted. In the present embodiment, in the piece 14A, the dimension of the surface of the convex portion 14B facing the piezoelectric element 33 (vertical and horizontal in the case of a rectangle) is smaller than the dimension of the lower surface of the piezoelectric element 33 (vertical and horizontal in the case of a rectangle). doing. Also in this embodiment, the same effect as the fourth embodiment is obtained. Moreover, according to this embodiment, there exists an effect that the bending vibration of the piece 14A becomes difficult to be transmitted to the piezoelectric element 33. Further, according to the present embodiment, since the stress in the vertical direction is concentrated on the central area of the lower surface of the piezoelectric element 33 facing the convex portion 14B, the detection accuracy of the pressure in the vertical direction in the piezoelectric element 33 can be improved. it can. Further, the same effect can be obtained by projecting a convex portion smaller than the piezoelectric element 33 from the saddle 22A. In this case, the dimension of the surface of the convex portion facing the piezoelectric element 33 is made smaller than the dimension of the upper surface or the lower surface of the piezoelectric element 33.

<Sixth Embodiment>
FIG. 14 is a cross-sectional view showing a configuration in which the pickup device according to the sixth embodiment of the present invention is cut along a plane perpendicular to the strings. In FIG. 14, the same reference numerals are used for the elements common to the elements shown in FIG. 9 (second embodiment), and the description thereof is omitted. In the present embodiment, the high-rigidity block 35 in the second embodiment is offset to the outside of the saddle 22A. According to the present embodiment, in addition to the same effects as in the second embodiment, the plurality of high-rigidity blocks 35 are offset to the outside of the saddle 22A, so that the saddle 22A is stabilized against vibration of the string 15. An effect is obtained. Further, the same effect can be obtained by offsetting the convex portion protruding from the saddle 22A to the outside. In this case, the dimension of the surface of the convex portion facing the piezoelectric element is smaller than the dimension of the upper surface or the lower surface of the piezoelectric element.

<Seventh embodiment>
FIG. 15 is a cross-sectional view showing a configuration in which a pickup device according to a seventh embodiment of the present invention is cut along a plane perpendicular to the strings. In FIG. 15, the same reference numerals are used for elements common to those shown in FIG. 9 (second embodiment), and description thereof is omitted. In the present embodiment, the lower flexible substrate 34 in the second embodiment is directly fixed on the piece 14, and the signal electrodes 40_i (i = 1 to 1) of the signal wiring surface 34b of the lower flexible substrate 34 are fixed. 4) A metal high-rigidity block 35 is fixed on (see FIG. 4), and the lower surface of each piezoelectric element 33 is fixed to the upper surface of these high-rigidity blocks 35. Also in this embodiment, the same effect as the second embodiment can be obtained. In this case, the high-rigidity block 35 is preferably a conductor.

<Other embodiments>
As mentioned above, although each embodiment of this invention was described, other embodiment can be considered to this invention. For example, in each of the above embodiments, the present invention is applied to a guitar pickup device, but the present invention is naturally applicable to stringed instruments other than guitars. Moreover, in each said embodiment, you may use the block which consists of highly elastic resin instead of a highly rigid block.

<Application of each embodiment>
In each embodiment of the present invention, an attack feeling can be obtained by preferentially obtaining signals in the X-axis direction. Specifically, since the signal in the X-axis direction picks up the natural vibration of the string, the high-frequency component stands out, and it becomes easy to extract the characteristics of the player's playing style. Since the signal in the Y-axis direction is not affected by the soundboard, the attenuation is small and it is easy to extract the sustain feeling. The Z-axis signal reflects normal guitar sound. Therefore, the sound quality desired by the performer can be obtained by filtering the signal for each axis, adjusting the weighting, and synthesizing the signals. In particular, by extracting a high-frequency component from a signal in the X-axis direction with a high-pass filter of 2 kHz, for example, and increasing the weighting of the extracted signal, the sense of attack can be enhanced. Sustain feeling can be enhanced by extracting a signal on the low frequency side from the signal in the Y-axis direction and increasing the weight of the extracted signal.

20... Pickup device, 15... String, 22, 22 A... Saddle, 14 and 14 A... Piece, 14 B... Projection, 31, 35. ...... Lower flexible substrate, 32a, 34a .... ground plane, 34b..signal wiring surface, 33 ..... piezoelectric element, 40_i (i = 1 to 4) .... signal electrode, 41.about.44 ... signal wiring. , 22a, 22c, 22e, 22f ... Legs.

Claims (5)

In a pickup device for a stringed instrument that picks up vibration of a string by a piezoelectric element arranged between a saddle and a piece that support the string,
A plurality of piezoelectric elements are provided for one string,
A lower flexible substrate on which electrodes are formed is provided between the plurality of piezoelectric elements and the piece,
An upper flexible substrate on which an electrode is formed is provided between the plurality of piezoelectric elements and the saddle,
A plurality of first protrusions that individually face each of the plurality of piezoelectric elements from the saddle side, and a plurality of second protrusions that face each of the plurality of piezoelectric elements separately from the piece side. Provided,
A pickup device for a stringed instrument, wherein the plurality of piezoelectric elements are sandwiched between the first convex portion and the second convex portion, respectively. The electrodes formed on the lower flexible substrate are signal electrodes for extracting signals from the plurality of piezoelectric elements, and the electrodes formed on the upper flexible substrate ground the plurality of piezoelectric elements. The pickup device according to claim 1, wherein the pickup device is a ground electrode .   3. The pickup device according to claim 1, wherein the first convex portion is a plurality of leg portions protruding downward from a bottom surface of the saddle.   The pickup device according to any one of claims 1 to 3, wherein the second protrusions are a plurality of protrusions protruding from an upper surface of the piece toward the plurality of piezoelectric elements. . In a pickup device for a stringed instrument that picks up vibration of a string by a piezoelectric element arranged between a saddle and a piece that support the string,
A plurality of piezoelectric elements are provided for one string, a plurality of first convex portions that individually face each of the plurality of piezoelectric elements from the saddle side, and a plurality of piezoelectric elements from the piece side to each of the plurality of piezoelectric elements. A plurality of second convex portions separately facing each other,
The plurality of piezoelectric elements are respectively sandwiched by the first convex portion and the second convex portion,
Said first protrusion or the second aspect and to Lupi Kkuappu device dimensions of the opposing surface that is smaller than the upper surface or lower surface of the dimensions of the piezoelectric element and the piezoelectric element in the convex portion.

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