Performance control device and keyboard instrument

Abstract

To take EMI countermeasures related to systems for detecting displacement of movable parts such as keys.SOLUTION: A keyboard instrument 100 comprises a plurality of keys 12 that is displaced in response to performance actions, a detection system 20, and an electromagnetic shield 70 for shielding electromagnetic waves emitted from the detection system 20. The detection system 20 includes, for each of the plurality of keys 12, a first coil 51 installed in the key 12 and a second coil 61 facing the first coil 52, and generates a detection signal D at a level corresponding to the distance between the first coil 51 and the second coil 61. The electromagnetic shield 70 includes a second shield section 72 continuous over the plurality of keys 12, and the second coil 61 is located between the first coil 51 and the second shield section 72.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present disclosure relates to a performance operation device and a keyboard instrument used for musical performance. [Background technology]

[0002] For example, various techniques have been proposed for detecting the displacement of a movable member such as a key in a keyboard instrument. Patent Document 1 discloses a configuration for detecting the position of each key using a first coil mounted on the frame of the keyboard instrument and a second coil mounted on each key. In this configuration, when the second coil is displaced by pressing a key, the current flowing through the first coil changes. By detecting the current flowing through the first coil, a detection signal indicating whether or not a key has been pressed is generated. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] U.S. Patent No. 4,580,478 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the technology of Patent Document 1 has a problem in that electromagnetic waves caused by the current supplied to each coil affect other electronic devices located around the keyboard instrument. In consideration of the above circumstances, one aspect of the present disclosure aims to realize a countermeasure against EMI (Electromagnetic Interference) in a system for detecting the position of a movable member such as a key. [Means for solving the problem]

[0005] In order to solve the above problems, a performance operation device according to one aspect of the present disclosure comprises a plurality of movable members that are displaced in response to performance actions, a detection system that includes, for each of the plurality of movable members, a magnetic body installed on the movable member and a coil facing the magnetic body, and generates a detection signal at a level corresponding to the distance between the magnetic body and the coil, and an electromagnetic shield for blocking electromagnetic waves emitted from the detection system, the electromagnetic shield including a shield portion that is continuous across the plurality of movable members, and the coil being positioned between the magnetic body and the shield portion.

[0006] A keyboard instrument according to one aspect of the present disclosure comprises a plurality of keys that move in response to playing actions, a magnetic body installed on each of the plurality of keys, and a coil facing the magnetic body, and is equipped with a detection system that generates a detection signal at a level corresponding to the distance between the magnetic body and the coil, an electromagnetic shield for blocking electromagnetic waves emitted from the detection system, and a sound generating unit that generates sound corresponding to the detection signal, wherein the electromagnetic shield includes a shielding portion that is continuous across the plurality of keys, and the coil is positioned between the magnetic body and the shielding portion. [Brief explanation of the drawings]

[0007] [Figure 1] 1 is a block diagram illustrating the configuration of a keyboard instrument according to a first embodiment. [Figure 2] FIG. 1 is a block diagram illustrating the configuration of a keyboard instrument. [Figure 3] FIG. 2 is a circuit diagram of a signal generating unit. [Figure 4] FIG. 2 is a circuit diagram of a part to be detected. [Figure 5] FIG. 2 is a block diagram illustrating the configuration of a signal processing circuit. [Figure 6] FIG. 2 is a plan view of the key as seen from the signal generating unit side. [Figure 7] FIG. 4 is a plan view illustrating a specific configuration of a detection target portion. [Figure 8] 8 is a cross-sectional view taken along line aa in FIG. 7. [Figure 9]4 is an explanatory diagram of a magnetic field generated in a first coil of a part to be detected. FIG. [Figure 10] FIG. 2 is a plan view of the signal generating unit as seen from the key side. [Figure 11] FIG. 2 is a plan view illustrating a specific configuration of a signal generating unit. [Figure 12] 11 is a cross-sectional view taken along the line bb in FIG. 10. [Figure 13] 4 is an explanatory diagram of a magnetic field generated in a second coil of a signal generating unit. FIG. [Figure 14] FIG. 10 is a plan view of a signal generating section in the second embodiment. [Figure 15] FIG. 15 is a cross-sectional view taken along the line cc in FIG. [Figure 16] FIG. 10 is a plan view of a second shield part in the second embodiment. [Figure 17] FIG. 10 is a plan view of a second shield part in a modified example of the second embodiment. [Figure 18] FIG. 11 is a plan view of a detection target portion in the third embodiment. [Figure 19] 19 is a cross-sectional view taken along the line dd in FIG. 18. [Figure 20] FIG. 11 is a plan view of a first shield part in a third embodiment. [Figure 21] FIG. 10 is a cross-sectional view of a signal generating section in the fourth embodiment. [Figure 22] FIG. 11 is a cross-sectional view of a detection target portion in the fifth embodiment. [Figure 23] FIG. 10 is a schematic diagram of a detection system according to a sixth embodiment. [Figure 24] FIG. 13 is a schematic diagram of a detection system according to a seventh embodiment. [Figure 25] FIG. 13 is a schematic diagram of a detection system according to an eighth embodiment. [Figure 26] FIG. 10 is a cross-sectional view of a first shield part according to a modified example. DETAILED DESCRIPTION OF THE INVENTION

[0008] A: First embodiment FIG. 1 is a block diagram illustrating the configuration of a keyboard instrument 100 according to a first embodiment of the present disclosure. The keyboard instrument 100 (an example of a "performance operation device") is an electronic musical instrument including a keyboard 10, a detection system 20, an information processing device 30, and a sound emission device 40. The keyboard 10 is composed of a plurality of keys 12 (an example of a "movable member"), including a plurality of white keys and a plurality of black keys. Each of the plurality of keys 12 is a movable member that is displaced in response to a performance action by a user. The detection system 20 detects the position of each key 12. The information processing device 30 generates an audio signal V in accordance with the detection result by the detection system 20. The audio signal V is a signal representing a musical tone of a pitch corresponding to the key 12 operated by the user. The sound emission device 40 emits the sound represented by the audio signal V. For example, a speaker or headphones may be used as the sound emission device 40.

[0009] FIG. 2 is a block diagram illustrating the specific configuration of the keyboard instrument 100, focusing on one key 12 on the keyboard 10. Assume an X-axis and a Y-axis. Multiple keys 12 are arranged along the X-axis. The Y-axis is perpendicular to the X-axis. The XY plane is a horizontal plane. Each key 12 is arranged so that its longitudinal direction is along the Y-axis. In other words, the Y-axis is an axis along the long side of each key 12. Observation from a direction perpendicular to the XY plane will be referred to as "planar view" below.

[0010] Each key 12 of the keyboard 10 is supported by a support 14 with a fulcrum (balance pin) 13 as a fulcrum. The support 14 is a structure (frame) that supports each element of the keyboard instrument 100. An end 121 of each key 12 is displaced vertically when the user presses and releases the key. The detection system 20 generates a detection signal D for each of the multiple keys 12, the level of which corresponds to the position Z of the end 121 in the vertical direction. The position Z is expressed as the amount of displacement of the end 121 relative to the position of the end 121 in a released state where no load is applied to the key 12.

[0011] The detection system 20 includes a detected portion 50, a signal generating portion 60, a substrate 65, and a signal processing circuit 21. The detected portion 50 and the signal generating portion 60 are installed for each key 12. The signal generating portion 60 is installed on the support 14. The detected portion 50 is installed on the key 12. Specifically, the detected portion 50 is installed on the bottom surface (hereinafter referred to as the "installation surface") 122 of the key 12. The detected portion 50 includes a first coil 51 (an example of a "magnetic material"). The signal generating portion 60 includes a second coil 61 (an example of a "coil"). The first coil 51 and the second coil 61 face each other with a gap between them in the vertical direction. The distance between the signal generating portion 60 and the detected portion 50 (the distance between the first coil 51 and the second coil 61) changes depending on the position Z of the end portion 121 of the key 12.

[0012] 3 is a circuit diagram illustrating the electrical configuration of the signal generating unit 60. The signal generating unit 60 includes a resonant circuit including an input terminal T1, an output terminal T2, a second coil 61, a capacitive element 62, and a capacitive element 63. The second coil 61 is connected between the input terminal T1 and the output terminal T2. The capacitive element 62 is connected between the input terminal T1 and a ground line, and the capacitive element 63 is connected between the output terminal T2 and a ground line. The signal generating unit 60 functions as a low-pass filter that suppresses low-frequency components in the signal supplied to the input terminal T1.

[0013] 4 is a circuit diagram illustrating the electrical configuration of the detected portion 50. The detected portion 50 has a resonant circuit including a first coil 51 and a capacitive element 52. Both ends of the first coil 51 and both ends of the capacitive element 52 are connected to each other. The resonant frequency of the detected portion 50 and the resonant frequency of the signal generating portion 60 are the same. However, the resonant frequency of the detected portion 50 and the resonant frequency of the signal generating portion 60 may be different.

[0014] The signal processing circuit 21 in FIG. 2 generates a detection signal D whose level corresponds to the distance between the first coil 51 and the second coil 61. FIG. 5 is a block diagram illustrating a specific functional configuration of the signal processing circuit 21. The signal processing circuit 21 includes a supply circuit 22 and an output circuit 23. The supply circuit 22 supplies a reference signal R to each of the multiple signal generating units 60. The reference signal R is a current signal or voltage signal whose level periodically fluctuates. For example, a periodic signal with an arbitrary waveform, such as a sine wave, is used as the reference signal R. The supply circuit 22 supplies the reference signal R to each signal generating unit 60 in a time-division manner. Specifically, the supply circuit 22 is a demultiplexer that sequentially selects each of the multiple signal generating units 60 and supplies the reference signal R to the selected signal generating unit 60. That is, the reference signal R is supplied to each of the multiple signal generating units 60 in a time-division manner. The period of the reference signal R is sufficiently shorter than the duration of the period during which the supply circuit 22 selects one signal generating unit 60. The frequency of the reference signal R is approximately equal to the resonant frequency of the signal generating unit 60 and the detected unit 50. However, the frequency of the reference signal R and the resonant frequency of the signal generating unit 60 and the detected unit 50 may be different.

[0015] As illustrated in FIG. 3, a reference signal R is supplied to an input terminal T1 of the signal generating unit 60. A current corresponding to the reference signal R is supplied to the second coil 61, thereby generating a magnetic field in the second coil 61. An induced current is generated in the first coil 51 due to electromagnetic induction caused by the magnetic field generated in the second coil 61. Therefore, a magnetic field is generated in the first coil 51 in a direction that cancels out the change in the magnetic field in the second coil 61. The magnetic field generated in the first coil 51 changes depending on the distance between the first coil 51 and the second coil 61. Therefore, a detection signal d having an amplitude level δ corresponding to the distance between the first coil 51 and the second coil 61 is output from the output terminal T2 of the signal generating unit 60. The detection signal d is a periodic signal whose level fluctuates with the same period as the reference signal R.

[0016] The output circuit 23 in Figure 5 generates a detection signal D by arranging, on a time axis, the detection signals d output sequentially from each of the multiple signal generating units 60. That is, the detection signal D is a voltage signal with an amplitude level δ that corresponds to the distance between the first coil 51 and the second coil 61 of each key 12. As described above, the distance between the first coil 51 and the second coil 61 is linked to the position Z of each key 12, so the detection signal D can be expressed as a signal that corresponds to the position Z of each of the multiple keys 12. The detection signal D generated by the output circuit 23 is supplied to the information processing device 30.

[0017] 2 analyzes the position Z of each key 12 by analyzing the detection signal D supplied from the signal processing circuit 21. The information processing device 30 is realized by a computer system including a control device 31, a storage device 32, an A / D converter 33, and a sound source circuit 34. The A / D converter 33 converts the detection signal D supplied from the signal processing circuit 21 from analog to digital.

[0018] The control device 31 is composed of one or more processors that control each element of the keyboard instrument 100. For example, the control device 31 is composed of one or more types of processors, such as a CPU (Central Processing Unit), an SPU (Sound Processing Unit), a DSP (Digital Signal Processor), an FPGA (Field Programmable Gate Array), or an ASIC (Application Specific Integrated Circuit).

[0019] The storage device 32 is one or more memories that store programs executed by the control device 31 and data used by the control device 31. The storage device 32 is configured with a known storage medium such as a magnetic storage medium or a semiconductor storage medium. The storage device 32 may also be configured with a combination of multiple types of storage medium. The storage device 32 may also be a portable storage medium that can be attached to and detached from the keyboard instrument 100, or an external storage medium (e.g., online storage) with which the keyboard instrument 100 can communicate.

[0020] The control device 31 analyzes the detection signal D converted by the A / D converter 33 to analyze the position Z of each key 12. The control device 31 also instructs the sound source circuit 34 to generate a musical tone corresponding to the position Z of each key 12. The sound source circuit 34 generates an audio signal V representing the musical tone instructed by the control device 31. That is, the sound source circuit 34 generates the audio signal V corresponding to the amplitude level δ of the detection signal D. For example, the volume of the audio signal V is controlled according to the amplitude level δ. The audio signal V is supplied from the sound source circuit 34 to the sound emission device 40, causing the sound emission device 40 to emit a musical tone corresponding to the user's performance action (depressing or releasing each key 12). Note that the control device 31 may also implement the function of the sound source circuit 34 by executing a program stored in the storage device 32.

[0021] The detection system 20 emits electromagnetic waves using a magnetic field generated from the first coil 51 and a magnetic field generated from the second coil 61. The electromagnetic shield 70 in FIG. 2 is used to prevent EMI (Electromagnetic Interference), which is an effect of the electromagnetic waves emitted from the detection system 20 on other electronic devices located nearby. Specifically, the electromagnetic shield 70 is a barrier for blocking the electromagnetic waves emitted from the detection system 20. The electromagnetic shield 70 is made of a magnetic material or a conductive material. For example, the electromagnetic shield 70 is made of a metal.

[0022] Specifically, the electromagnetic shield 70 is formed to surround the detection system 20. The electromagnetic shield 70 of the first embodiment includes a first shield portion 71 and a second shield portion 72. The first shield portion 71 is a barrier for blocking electromagnetic waves emitted from the detection target portion 50. On the other hand, the second shield portion 72 is a barrier for blocking electromagnetic waves emitted from the signal generating portion 60. The first shield portion 71 is attached to the key 12, and the second shield portion 72 is attached to the support body 14. The specific configurations of the first shield portion 71 and the second shield portion 72 will be described later.

[0023] FIG. 6 is a plan view of the key 12 as viewed from the signal generating unit 60 side. A detectable portion 50 is provided for each key 12. A first shield portion 71 is provided for each detectable portion 50 (first coil 51). FIG. 7 is a plan view illustrating a specific configuration of the detectable portion 50. FIG. 7 shows a plan view of the detectable portion 50 as viewed from the signal generating unit 60 side. FIG. 8 is a cross-sectional view taken along line aa in FIG. 7.

[0024] The detected part 50 of the first embodiment is composed of a wiring board including a first coil 51 and a substrate 55. The substrate 55 is a rectangular plate-like member including a surface F1 and a surface F2. The surface F2 is the surface facing the installation surface 122 of the key 12. The surface F1 is the surface opposite to the surface F2. Therefore, the surface F1 faces the signal generating part 60. The width of the substrate 55 is smaller than the width of one key 12.

[0025] The first coil 51 is a conductive film formed on the surface (surface F1 and surface F2) of the base material 55. Specifically, the first coil 51 is formed by patterning, which selectively removes the conductive film that covers the entire surface of the base material 55. The first coil 51 includes a first section 511 and a second section 512. The first section 511 and the second section 512 are formed on the surface F1. The first section 511 and the second section 512 are formed in different regions when viewed in a plan view from a direction perpendicular to the surface F1. Specifically, the first section 511 and the second section 512 are adjacent to each other along the longitudinal direction (Y-axis) of the key 12.

[0026] The first section 511 is a spiral section that spirals clockwise from an inner end Ea1 to an outer end Ea2, while the second section 512 is a spiral section that spirals clockwise from an inner end Eb1 to an outer end Eb2.

[0027] The first coil 51 includes a connecting wire 514 formed on the surface F2 of the base material 55. The end Ea1 and the end Eb1 are connected to each other via the connecting wire 514. In addition, the capacitive element 52 mounted on the surface F1 is interposed between the end Ea2 and the end Eb2.

[0028] As can be understood from the above explanation, the direction of current flowing in the first section 511 is opposite to the direction of current flowing in the second section 512. Specifically, when a current flows in the first section 511 in a direction Q1, a current flows in the second section 512 in a direction Q2 opposite to the direction Q1. Therefore, as illustrated in Fig. 9, magnetic fields of opposite directions are generated in the first section 511 and the second section 512. In other words, a magnetic field is formed that flows from one of the first section 511 and the second section 512 to the other.

[0029] As illustrated in FIG. 8, the first shield portion 71 of the first embodiment is embedded in the key 12. The first shield portion 71 is formed to overlap the first coil 51 in a plan view. Specifically, the first shield portion 71 includes a first base portion 71a, a first side wall portion 71b1, and a first side wall portion 71b2. The first base portion 71a is a portion located on the opposite side of the first coil 51 from the second coil 61. In other words, the first coil 51 is located between the second coil 61 and the first base portion 71a. Specifically, the first base portion 71a is a plate-like member parallel to the substrate 55. As illustrated in FIG. 6, the first coil 51 is located inside the first base portion 71a in a plan view. The first base portion 71a is formed, for example, over the entire short-side direction (the direction of the X-axis) of the key 12.

[0030] As illustrated in FIG. 8, the first side wall portion 71b1 and the first side wall portion 71b2 are portions that protrude from the first base portion 71a toward the support 14. That is, they are formed from the surface of the first base portion 71a toward the installation surface 122. The first side wall portion 71b1 and the first side wall portion 71b2 are formed on the periphery of the first base portion 71a along the X-axis. The first side wall portion 71b1 is formed on the periphery of the first base portion 71a along the X-axis in the negative direction of the Y-axis. The first side wall portion 71b2 is formed on the periphery of the first base portion 71a along the X-axis in the positive direction of the Y-axis. As illustrated in FIG. 6, the first coil 51 is located between the first side wall portion 71b1 and the first side wall portion 71b2. Note that one or both of the first side wall portion 71b1 and the first side wall portion 71b2 may be omitted.

[0031] Electromagnetic waves radiated from the first coil 51 are shielded by the first shield portion 71. In the first embodiment, the first shield portion 71 includes the first base portion 71a, and therefore, as illustrated in Fig. 9, the first shield portion 71 can effectively shield electromagnetic waves radiated from the magnetic body on the opposite side of the coil. In addition, the first shield portion 71 includes the first side wall portion 71b1 and the first side wall portion 71b2, which has the advantage of effectively shielding electromagnetic waves radiated from the first coil 51 to the surroundings.

[0032] FIG. 10 is a plan view of the signal generating unit 60 as viewed from the key 12 side. A second coil 61 is provided for each first coil 51. The second shield portion 72 of the first embodiment is provided continuously across multiple keys 12. In other words, the second shield portion 72 is formed in an elongated shape along the X-axis. FIG. 11 is a plan view illustrating a specific configuration of the signal generating unit 60. FIG. 11 shows a plan view of the signal generating unit 60 as viewed from the detected portion 50 side. FIG. 12 is a cross-sectional view taken along line bb in FIG. 11.

[0033] As illustrated in FIG. 11, the signal generating unit 60 is composed of a wiring board including a second coil 61. The signal generating unit 60 is formed on a substrate 65. The substrate 65 is a long, continuous plate-like member that spans multiple keys 12. As illustrated in FIG. 12, the substrate 65 is a plate-like member that includes a surface F3 and a surface F4. The surface F4 faces the second base portion 72a. The surface F3 is the surface opposite to the surface F4. Therefore, the surface F3 faces the detection target portion 50. The substrate 65 may be installed individually for each key 12.

[0034] As illustrated in FIG. 11 , the second coil 61 is a conductive film formed on the surface (surface F3 and surface F4) of the base material 65. Specifically, a plurality of second coils 61 are formed collectively by patterning, which selectively removes the conductive film covering the entire surface of the base material 65. A plurality of second coils 61 corresponding to different keys 12 are formed on the base material 65. Specifically, the second coil 61 includes a third section 611 and a fourth section 612. The third section 611 and the fourth section 612 are formed on the surface F3. The third section 611 and the fourth section 612 are formed in different regions when viewed in a plan view perpendicular to the surface F3. Specifically, the third section 611 and the fourth section 612 are adjacent to each other along the longitudinal direction of the key 12.

[0035] The third section 611 is a spiral section that winds counterclockwise from the inner end Ec1 to the outer end Ec2. The fourth section 612 is a spiral section that winds counterclockwise from the inner end Ed1 to the outer end Ed2. The distance between the first coil 51 and the second coil 61 in the direction of the center axis of the second coil 61 (i.e., the direction perpendicular to the surface F3) varies depending on the position Z of the key 12.

[0036] The second coil 61 includes a connecting wiring 614 formed on the surface F4 of the substrate 65. The end Ec1 and the end Ed1 are connected to each other via the connecting wiring 614. In addition, an input terminal T1 and an output terminal T2 are formed on the surface F3. A capacitance element 62 is connected between the input terminal T1 and the end Ec2 of the third section 611. A capacitance element 63 is connected between the output terminal T2 and the end Ed2 of the fourth section 612. The wiring connecting the capacitance element 62 and the capacitance element 63 to each other is connected to a ground point G that is set to the ground potential.

[0037] As can be understood from the above explanation, the direction of current flowing in the third section 611 is opposite to the direction of current flowing in the fourth section 612. Specifically, when a current flows in the third section 611 in a direction Q3, a current flows in the fourth section 612 in a direction Q4 opposite to the direction Q3. Therefore, as illustrated in Fig. 13, magnetic fields of opposite directions are generated in the third section 611 and the fourth section 612. That is, a magnetic field is formed that flows from one of the third section 611 and the fourth section 612 to the other.

[0038] As illustrated in FIG. 12, the second shield section 72 is disposed on the surface of the support 14. Specifically, the second shield section 72 is disposed at a position overlapping the plurality of second coils 61 in a plan view. The second shield section 72 of the first embodiment includes a second base section 72a, a second side wall section 72b1, and a second side wall section 72b2. The second base section 72a is a section located on the opposite side of the second coil 61 from the first coil 51. In other words, the second coil 61 is located between the first coil 51 and the second base section 72a. As illustrated in FIG. 10, the second base section 72a of the first embodiment is a plate-like member that is elongated along the X-axis. For example, the second base section 72a extends from one end of the keyboard 10 to the other end. The second base section 72a is disposed on the surface of the support 14.

[0039] As illustrated in FIG. 10, the second side wall 72b protrudes from the second base portion 72a toward the key 12. The second side wall 72b1 and the second side wall 72b2 are formed on the periphery of the second base portion 72a along the X-axis. The second side wall 72b1 is formed on the periphery of the second base portion 72a along the X-axis in the negative direction of the Y-axis. The second side wall 72b2 is formed on the periphery of the first base portion 71a along the X-axis in the positive direction of the Y-axis. As illustrated in FIG. 10, the signal generating unit 60 (plurality of second coils 61) is located between the second side wall 72b1 and the second side wall 72b2. Note that one or both of the second side wall 72b1 and the second side wall 72b2 may be omitted.

[0040] As illustrated in FIG. 12, the substrate 65 on which the signal generating unit 60 is formed is placed in a space surrounded by the second base portion 72a and the second sidewall portions 72b1 and 72b2. The substrate 65 of the first embodiment is supported by the second shield portion 72. Specifically, the substrate 65 is supported by a fixing member 81 placed on the surface of the second base portion 72a. The fixing member 81 is a spacer made of, for example, an insulating material, and holds the substrate 65 at a distance from the second base portion 72a. In other words, the substrate 65 and the second shield portion 72 do not come into direct contact with each other.

[0041] Electromagnetic waves radiated from the second coil 61 are blocked by the second shield portion 72. In the first embodiment, the second shield portion 72 can effectively block electromagnetic waves radiated from the second coil 61 on the side opposite to the first coil 51. Furthermore, since the second shield portion 72 includes the second side wall portion 72b1 and the second side wall portion 72b2, there is an advantage in that electromagnetic waves radiated from the second coil 61 to the surroundings can be effectively blocked. For example, electromagnetic waves radiated from the second coil 61 in the Y-axis direction are blocked by the second side wall portion 72b1 and the second side wall portion 72b2.

[0042] As can be understood from the above explanation, in the first embodiment, EMI countermeasures are achieved by the electromagnetic shield 70 for blocking electromagnetic waves emitted from the detection system 20 including the first coil 51 and the second coil 61. Therefore, it is possible to reduce the impact of electromagnetic waves emitted from the detection system 20 on surrounding electronic devices. In particular, in the first embodiment, the electromagnetic shield 70 includes a first shield portion 71 installed on the key 12 and a second shield portion 72 installed on the support body 14, thereby achieving more effective EMI countermeasures than a configuration in which the electromagnetic shield 70 is installed on only one of the support body 14 and the key 12.

[0043] B: Second embodiment The second embodiment will be described below. Note that, in the configurations exemplified below, for elements whose functions are similar to those of the first embodiment, the reference numerals used in the description of the first embodiment will be used and detailed descriptions of each will be omitted as appropriate.

[0044] Fig. 14 is a plan view of the signal generating unit 60 in the second embodiment. Fig. 15 is a cross-sectional view taken along line cc in Fig. 14. Fig. 16 is a plan view of the second shielding unit 72 in the second embodiment. Fig. 16 shows the state in which the substrate 65 has been removed from Fig. 14.

[0045] The second base portion 72a of the second shield portion 72 includes regions A20, A21, and A22 in a plan view. Region A21 is a strip-shaped region extending in the X-axis direction along the second side wall portion 72b1. Region A22 is a strip-shaped region extending in the X-axis direction along the second side wall portion 72b2. Region A20 is a strip-shaped region extending in the X-axis direction between regions A21 and A22. As can be seen from FIGS. 14 and 15 , the multiple second coils 61 are arranged in the X-axis direction within a strip-shaped region that overlaps region A20 in a plan view on the surface F3 of the substrate 65. No second coils 61 are formed in regions of the substrate 65 that overlap region A21 and region A22.

[0046] 14 to 16, a plurality of openings O2 (O21, O22) are formed in the second base portion 72a of the second embodiment. Each opening O2 is a substantially rectangular through-hole that penetrates the second base portion 72a.

[0047] The plurality of openings O21 are formed in the region A21 of the second base portion 72a. Specifically, the plurality of openings O21 are arranged in the X-axis direction at intervals from one another within the region A21 in a plan view. The plurality of openings O22 are formed in the region A22 of the second base portion 72a. Specifically, the plurality of openings O22 are arranged in the X-axis direction at intervals from one another within the region A22 in a plan view. On the other hand, no openings O2 are formed in the region A20. That is, in the second embodiment, each opening O2 does not overlap any of the plurality of second coils 61 in a plan view.

[0048] The second embodiment also achieves the same effects as the first embodiment. In a configuration in which the opening O2 is formed in the second shield part 72 as in the second embodiment, the opening O2 reduces the effect of the second shield part 72 in inhibiting the magnetic field generated in the second coil 61. Therefore, it is possible to generate a magnetic field over a wide area around the second coil 61 while adequately maintaining the EMI countermeasure effect of the second shield part 72. Expanding the range of the magnetic field of the second coil 61 expands the range of the position Z of the key 12 that changes the magnetic field. In other words, it is easier to ensure a range in which the position Z of the key 12 can be detected.

[0049] The configuration of the openings O2 in the second shield part 72 (for example, the planar shape or the number) is arbitrary. For example, while Fig. 16 illustrates a configuration in which multiple openings O21 are arranged in the X-axis direction, a single opening O21 extending in the X-axis direction may be formed in the region A21. Similarly, instead of multiple openings O22 arranged in the X-axis direction, a single opening O22 extending in the X-axis direction may be formed in the region A22.

[0050] In the above description, the opening O2 is formed in each of the regions A21 and A22 of the second base portion 72a. However, as illustrated in FIG. 17, the opening O2 may be formed in the region A20 of the second base portion 72a. That is, one opening O2 extending in the X-axis direction is formed in the region A20. The opening O2 overlaps with the plurality of second coils 61 in a planar view. That is, the plurality of second coils 61 are located inside the opening O2 in a planar view. Note that a plurality of openings O2 arranged in the X-axis direction at intervals from each other may be formed in the region A20.

[0051] C: Third embodiment Fig. 18 is a plan view of the key 12 as seen from the signal generating unit 60 side. Fig. 19 is a cross-sectional view taken along line dd in Fig. 18. Fig. 20 is a plan view of the first shield part 71 in the third embodiment. Fig. 20 shows the state in which the multiple detection parts 50 have been removed from Fig. 18.

[0052] The first base portion 71a of the first shield portion 71 includes regions A10, A11, and A12 in a plan view. Region A11 is a region adjacent to the first side wall portion 71b1. Region A12 is a region adjacent to the first side wall portion 71b2. Region A10 is a region between regions A11 and A12. As can be seen from FIGS. 18 and 19, the first coil 51 is formed in a region of the surface F1 of the substrate 55 that overlaps with region A10 in a plan view. The first coil 51 is not formed in regions of the substrate 55 that overlap with region A11 and region A12.

[0053] 18 to 20, a plurality of openings O1 (O11, O12) are formed in the first base portion 71a of the third embodiment. Each opening O1 is a substantially rectangular through-hole that penetrates the first base portion 71a.

[0054] The opening O11 is formed in the region A11 of the first base portion 71a. The opening O12 is formed in the region A12 of the first base portion 71a. On the other hand, no opening O1 is formed in the region A10. That is, in the second embodiment, each opening O1 does not overlap with the first coil 51 in a plan view.

[0055] The third embodiment also achieves the same effects as the first embodiment. In a configuration in which an opening O1 is formed in the first shield part 71 as in the third embodiment, the opening O1 reduces the effect of the first shield part 71 in inhibiting the magnetic field generated in the first coil 51. Therefore, it is possible to generate a sufficient magnetic field in the first coil 51 while adequately maintaining the EMI countermeasure effect of the first shield part 71. Expanding the range of the magnetic field of the first coil 51 expands the range of the position Z of the key 12 that changes the magnetic field. In other words, it is easier to ensure the range in which the position Z of the key 12 can be detected.

[0056] Note that multiple openings O1 may be formed in each of region A11 and region A12. Furthermore, one or more openings O1 that overlap with the first coil 51 in plan view may be formed in region A10. The opening O1 in region A11 or region A12 may be omitted.

[0057] D: Fourth embodiment 21 is a cross-sectional view of the signal generating unit 60 in the fourth embodiment. The screw 821 in FIG. 21 is a screw for fixing the substrate 65 and the second shielding section 72 to the support 14. That is, the screw 821 is inserted into the support 14 through a through-hole formed in the substrate 65 and a through-hole formed in the second shielding section 72. A spring 822 is interposed between the substrate 65 and the second shielding section 72 (second base section 72a). The spring 822 is a coil spring that surrounds the screw 821. The spring 822 biases the substrate 65 in a direction away from the support 14.

[0058] In the above configuration, the distance (spacing) between the substrate 65 and the second shield section 72 changes depending on the degree to which the screw 821 is fastened. That is, the screw 821 and the spring 822 function as an adjustment member for adjusting the distance between the substrate 65 and the second shield section 72. The magnetic field generated by the second coil 61 changes depending on the distance between the substrate 65 and the second shield section 72. Note that by adjusting the distance between the substrate 65 and the second shield section 72, the distance between the first coil 51 and the second coil 61 also changes. That is, the adjustment member realized by the screw 821 and the spring 822 also functions as an element for adjusting the distance between the first coil 51 and the second coil 61.

[0059] The fourth embodiment also achieves the same effects as the first embodiment. Moreover, in the fourth embodiment, the magnetic field generated in the second coil 61 can be adjusted by adjusting the distance between the base material 65 and the second shield part 72 using the adjustment members (screw 821 and spring 822).

[0060] The manner in which the distance between the base material 65 and the second shield part 72 can be adjusted is not limited to the above examples. For example, the distance between the base material 65 and the second shield part 72 can be adjusted by selectively interposing one of a plurality of fixing members 81 having different overall lengths between the base material 65 and the second shield part 72. In other words, the fixing member 81 is used as an adjustment member.

[0061] E: Fifth embodiment 22 is a cross-sectional view of the detected part 50 in the fifth embodiment. The detected part 50 is mounted on the mounting surface 122 of the key 12 with a screw 831. A spring 832 is interposed between the surface F2 of the base material 55 of the detected part 50 and the mounting surface 122. The spring 832 is, for example, a coil spring that surrounds the screw 831. The spring 832 biases the base material 55 in a direction away from the mounting surface 122.

[0062] In the above configuration, the distance between the base material 55 and the first shield part 71 changes depending on the degree of tightening of the screw 831. That is, the screw 831 and the spring 832 function as an adjustment member for adjusting the distance between the base material 55 and the first shield part 71. The magnetic field generated by the first coil 51 changes depending on the distance between the base material 55 and the first shield part 71. Note that by adjusting the distance between the base material 55 and the first shield part 71, the distance between the first coil 51 and the second coil 61 also changes. That is, the adjustment member realized by the screw 831 and the spring 832 also functions as an element for adjusting the distance between the first coil 51 and the second coil 61.

[0063] The fifth embodiment also achieves the same effects as the first embodiment. Furthermore, in the fifth embodiment, the magnetic field generated in the first coil 51 can be adjusted by adjusting the distance between the base material 55 and the first shield part 71 using the adjustment members (screw 831 and spring 832).

[0064] The manner in which the distance between the base material 55 and the first shield part 71 can be adjusted is not limited to the above examples. For example, the distance between the base material 55 and the first shield part 71 may be adjusted by selectively interposing one of a plurality of fixing members having different overall lengths between them.

[0065] F: Sixth embodiment 23 is a schematic diagram of a detection system 20 according to a sixth embodiment. As in the first embodiment, the detection system 20 generates, for each of the multiple keys 12, a detection signal D at a level corresponding to the position Z of the end 121 in the vertical direction.

[0066] Each key 12 is supported on the support body 14 with the fulcrum G1 as the fulcrum. The fulcrum G1 is attached to the support body 14 via a support fulcrum 141 attached to the support body 14. That is, the key 12 is supported on the support body 14 via the fulcrum G1 and the support fulcrum 141. The key 12 rotates around the fulcrum G1.

[0067] The key 12 of the sixth embodiment has a protrusion 124. The protrusion 124 is a portion at the end 121 that protrudes from the installation surface 122. The protrusion 124 is displaced vertically when the user presses and releases the key. The tip of the protrusion 124 is curved.

[0068] The keyboard instrument 100 of the sixth embodiment includes a housing 200 and a biasing body 90. The housing 200 is a hollow structure and is mounted on the support 14. The protrusion 124 passes through an opening formed in the housing 200. The biasing body 90 is a structure that provides the user with a sense of operation when pressing a key. A biasing body 90 is mounted for each of the multiple keys 12. Multiple biasing bodies 90 are housed inside the housing 200. Specifically, the biasing body 90 is supported by the support 14 using a fulcrum G2 as a fulcrum. The fulcrum G2 is mounted on the housing 200 via a fulcrum support 142 mounted in the internal space of the housing 200. In other words, the biasing body 90 is supported by the support 14 via the fulcrum G2, the fulcrum support 142, and the housing 200.

[0069] When the biasing body 90 is not pressed, it abuts against a stopper 19 provided in the internal space of the housing 200. When the tip of the protruding portion 124 presses the biasing body 90 by pressing a key, the biasing body 90 moves away from the stopper 19 and rotates around the fulcrum G2. Note that a weight portion N is provided inside the end of the biasing body 90 opposite the detection portion 50 to weight the end. Therefore, when the biasing body 90 is pressed by the protruding portion 124, the user feels an appropriate sense of resistance. In other words, the player can be given a good feel for operation.

[0070] The detected portion 50 is installed on the biasing body 90. For example, it is installed on the surface of the biasing body 90 opposite to the protruding portion 124. In the sixth embodiment, the detected portion 50 is installed at a position overlapping with the protruding portion 124 in a plan view. The detected portion 50 may be installed at any position on the biasing body 90. For example, the detected portion 50 may be installed on the surface of the biasing body 90 facing the protruding portion 124. On the other hand, the signal generating unit 60 is installed on the inner wall surface Wa of the housing 200. The second coil 61 of the signal generating unit 60 is installed so as to overlap with the first coil 51 of the detected portion 50 in a plan view.

[0071] The biasing body 90 on which the first coil 51 is installed is displaced by pressing a key. Therefore, similar to the first embodiment, the detection system 20 generates a detection signal D whose level corresponds to the distance between the first coil 51 and the second coil 61.

[0072] The inner wall surface Wa of the housing 200 is formed of a magnetic material or a conductive material. The inner wall surface Wa of the housing 200 surrounds the first coil 51 and the second coil 61. That is, the inner wall surface Wa of the housing 200 functions as an electromagnetic shield that blocks electromagnetic waves emitted from the detection system 20. The inner wall surface Wa (i.e., the electromagnetic shield) of the sixth embodiment includes a first portion Wa1, a second portion Wa2, a third portion Wa3, and a fourth portion Wa4.

[0073] The first portion Wa1 is a portion located in the negative direction of the Y axis relative to the first coil 51 and the second coil 61 (an example of the "first direction"). The second portion Wa2 is a portion located in the positive direction of the Y axis relative to the first coil 51 and the second coil 61 (hereinafter an example of the "second direction"). The third portion Wa3 is a portion located above the first coil 51 and the second coil 61. The fourth portion Wa4 is a portion located below the first coil 51 and the second coil 61. A shielding portion 126 functioning as an electromagnetic shield may be embedded in the protrusion 124 of the key 12 at a position corresponding to the opening of the casing 200. The shielding portion 126 is made of a magnetic material or a conductive material. The shielding portion 126 (an example of the "third portion") is located above the first coil 51 and the second coil 61.

[0074] In the sixth embodiment, the inner wall surface Wa, which functions as an electromagnetic shield, surrounds the first coil 51 and the second coil 61, thereby achieving effective EMI countermeasures.

[0075] G: Seventh embodiment 24 is a schematic diagram of a detection system 20 according to a seventh embodiment. In the seventh embodiment, the positions of the detection target portion 50 and the signal generation portion 60 are different from those in the sixth embodiment.

[0076] The keyboard instrument 100 of the seventh embodiment is equipped with a housing 300 instead of the housing 200. The housing 300 is a hollow structure and is installed on the support 14. One housing 200 is installed for each of the keys 12. The end 128 of each key 12 opposite to the end 121 (the side supported by the support 14) is housed in the internal space of the housing 300. Each key 12 passes through a through-hole in the housing.

[0077] The detected unit 50 of the seventh embodiment is installed on the installation surface 122 of the key 12 in the internal space of the housing 300. The signal generating unit 60 is installed at a position facing the signal generating unit 60 on the inner wall surface Wb of the housing 300. In other words, the inner wall surface Wb of the housing 300 surrounds the first coil 51 and the second coil 61.

[0078] The inner wall surface Wb of the housing 300 is formed of a magnetic material or a conductive material. The inner wall surface Wb of the housing 300 surrounds the first coil 51 and the second coil 61. That is, the inner wall surface Wb of the housing 300 functions as an electromagnetic shield that blocks electromagnetic waves emitted from the detection system 20. The inner wall surface Wb (i.e., the electromagnetic shield) of the seventh embodiment includes a first portion Wb1, a second portion Wb2, a third portion Wb3, and a fourth portion Wb4.

[0079] The first portion Wb1 is a portion located in the negative direction of the Y-axis relative to the first coil 51 and the second coil 61. The second portion Wb2 is a portion located in the positive direction of the Y-axis relative to the first coil 51 and the second coil 61. The third portion Wb3 is a portion located above the first coil 51 and the second coil 61. The fourth portion Wb4 is a portion located below the first coil 51 and the second coil 61. A shielding portion 127 functioning as an electromagnetic shield may be embedded in the key 12 at a position corresponding to the opening of the casing 300. For example, the shielding portion 127 is formed of a magnetic material or a conductive material. The shielding portion 127 (an example of the "second portion") is located in the positive direction of the Y-axis relative to the first coil 51 and the second coil 61.

[0080] In the seventh embodiment, as in the sixth embodiment, the inner wall surface Wb, which functions as an electromagnetic shield, surrounds the first coil 51 and the second coil 61, thereby achieving effective EMI countermeasures. In a configuration in which the housing 300 shown in FIG. 24 is omitted, for example, the weight N, which is made of a magnetic material such as metal, moves up and down in conjunction with the key 12, thereby affecting the magnetic field around the detection target 50 or the signal generating unit 60. In the seventh embodiment, a portion of the housing 300 is interposed between the weight N and the detection system 20 (the detection target 50 and the signal generating unit 60), thereby reducing the influence of the weight N on the detection system 20. In other words, the influence of elements (e.g., the weight N) located near the detection system 20 on the magnetic field used to detect the position Z can be suppressed. Therefore, there is also the advantage that the position Z of each key 12 can be detected with high accuracy. In the seventh embodiment, the biasing element 90 may be omitted.

[0081] H: Eighth embodiment The eighth embodiment illustrates a configuration in which the detection system 20 is applied to a string-striking mechanism 91 of a keyboard instrument 100. FIG. 25 is a schematic diagram illustrating the configuration of the detection system 20 according to the eighth embodiment. The string-striking mechanism 91 is an action mechanism that strikes strings (not shown) in conjunction with the displacement of each key 12 on the keyboard 10, similar to that of a piano, an acoustic musical instrument. Specifically, the string-striking mechanism 91 includes, for each key 12, a hammer 911 that can strike the strings by rotating, and a transmission mechanism 912 (e.g., a wippen, jack, repetition lever, etc.) that rotates the hammer 911 in conjunction with the displacement of the key 12. In the above configuration, the detection system 20 detects the displacement of the hammer 911 (an example of a "movable member").

[0082] The detected part 50 of the eighth embodiment is installed in a hammer 911 (for example, a hammer shank). The first shield part 71 of the eighth embodiment is embedded in the hammer 911. As in the first embodiment, the first shield part 71 includes a first base part 71a, a first side wall part 71b1, and a first side wall part 71b2, and is installed at a position overlapping the first coil 51 in a plan view.

[0083] The signal generating unit 60 is mounted on the support 14, as in the first embodiment. The support 14 in the eighth embodiment is a structure that supports, for example, the string-striking mechanism 91. The detected unit 50 may be mounted on a member other than the hammer 911 of the string-striking mechanism 91. The second shielding unit 72 includes a second base portion 72a, a second side wall portion 72b1, and a second side wall portion 72b2, as in the first embodiment. As in the first embodiment, the signal generating unit 60 is supported by the second shielding unit 72 (second base portion 72a) mounted on the surface of the support 14 via a fixing member 81. The eighth embodiment achieves the same effects as the first embodiment. The configurations of the second to sixth embodiments are also applicable to the eighth embodiment.

[0084] I: Variation Specific modified embodiments that can be added to each of the embodiments exemplified above are exemplified below. Two or more embodiments arbitrarily selected from the following examples may be combined as appropriate within the scope of not being mutually contradictory.

[0085] (1) In the above-described embodiments, the key 12, the biasing element 90, and the hammer 911 are exemplified as movable members, but the movable member is not limited to these examples. Any movable member may be used as long as it is displaced in response to playing. For example, the detection system 20 may be applied to the pedal mechanism of the keyboard instrument 100. The pedal mechanism includes a pedal operated by the user's foot and a support 14 that supports the pedal. In the above configuration, the detection system 20 detects displacement of the pedal. For example, the detected unit 50 is installed on the pedal, and the signal generating unit 60 is installed on the support 14 so as to face the detected unit 50. The pedal is an example of a movable member.

[0086] As can be understood from the above examples, the object of detection by the detection system 20 is generally expressed as a movable member that displaces in response to a performance action. The movable member includes performance controls such as the keys 12 or pedals that are directly operated by the user, as well as structures such as the hammer 911 that displace in response to the operation of the performance controls. However, the movable member in this disclosure is not limited to a member that displaces in response to a performance action. In other words, the movable member is generally expressed as a member that can be displaced regardless of the trigger that causes the displacement.

[0087] (2) In each of the above-mentioned embodiments, the detected portion 50 is installed on a movable member, and the signal generating portion 60 is installed opposite the detected portion 50, so long as the detected portion 50 and the signal generating portion 60 are installed in any position.

[0088] (3) In the first and eighth embodiments, the first shield part 71 includes the first base part 71a, the first side wall part 71b1, and the first side wall part 71b2. However, the configuration of the first shield part 71 is not limited to the above examples. For example, the first shield part 71 may include only one of the first base part 71a and the first side wall part 71b (71b1, 71b2), or may include a portion other than the first base part 71a and the first side wall part 71b (71b1, 71b2). Furthermore, the first shield part 71 may include a first side wall part of the first base part 71a that protrudes from the periphery of the X-axis toward the support body 14. As can be understood from the above description, the shape of the first shield part 71 is arbitrary.

[0089] (4) In the first and eighth embodiments, the second shield part 72 includes the second base part 72a, the second side wall part 72b1, and the second side wall part 72b2. However, the configuration of the second shield part 72 is not limited to the above examples. For example, the second shield part 72 may include only one of the second base part 72a and the second side wall part 72b (72b1, 72b2), or may include a portion other than the second base part 72a and the second side wall part 72b (72b1, 72b2). Furthermore, the second shield part 72 may include a second side wall part of the second base part 72a that protrudes from the periphery of the X-axis toward the movable member. As can be understood from the above description, the shape of the second shield part 72 is arbitrary.

[0090] (5) In the first and eighth embodiments, the electromagnetic shield 70 includes the first shield portion 71 and the second shield portion 72. However, the configuration of the electromagnetic shield 70 is not limited to the above examples. For example, the electromagnetic shield 70 may include only one of the first shield portion 71 and the second shield portion 72, or may include a portion other than the first shield portion 71 and the second shield portion 72.

[0091] (6) In the first embodiment, the entire first shield part 71 is embedded in the key 12. However, it is sufficient if at least a portion of the first shield part 71 is embedded in a movable member. Also, it is not necessary to embed the first shield part 71 in the key 12. As illustrated in FIG. 26 , for example, the first shield part 71 may be installed on the surface of the key 12, and the detected part 50 may be installed on the surface of the first shield part 71 via a fixing member 81 made of an insulating material. Note that, similarly in the eighth embodiment, the entire first shield part 71 does not have to be embedded in the hammer 911.

[0092] (7) In the first embodiment, the second shield section 72 is provided on the surface of the support body 14, but the second shield section 72 may be embedded in the support body 14. In the above configuration, for example, the signal generating section 60 is provided on the surface of the support body 14 at a position that overlaps with the second shield section 72 in a planar view.

[0093] (8) In the first and eighth embodiments, the second shield portion 72 may be provided for each key 12 .

[0094] (9) In the sixth embodiment, the entire housing 200 may be made of a magnetic material or a conductive material. That is, the entire housing 200 functions as an electromagnetic shield for blocking electromagnetic waves emitted from the detection system 20. Similarly, in the seventh embodiment, the entire housing 300 may be made of a magnetic material or a conductive material.

[0095] (10) In the sixth and seventh embodiments, the inner wall surface (Wa or Wb) of the housing (200 or 300) is used as an electromagnetic shield. However, the housing does not have to be used as an electromagnetic shield. That is, a member other than the housing may be used as the electromagnetic shield. A portion of the electromagnetic shield located in the negative direction of the Y-axis relative to the first coil 51 and the second coil 61 is collectively referred to as a first portion, and a portion of the electromagnetic shield located in the positive direction of the Y-axis relative to the first coil 51 and the second coil 61 is collectively referred to as a second portion. A portion of the electromagnetic shield located above the first coil 51 and the second coil 61 is collectively referred to as a third portion, and a portion of the electromagnetic shield located below the first coil 51 and the second coil 61 is collectively referred to as a fourth portion. Note that the first shield portion 71 is an example of the third portion, and the second shield portion 72 is an example of the fourth portion. The electromagnetic shield may include only some of the first, second, third and fourth portions, or may include portions other than the first, second, third and fourth portions.

[0096] (11) In the sixth embodiment, a housing 200 may be provided for each biasing element 90. Similarly, in the seventh embodiment, a housing 300 may be provided for each key 12.

[0097] (12) In the above-described embodiments, the keyboard instrument 100 is provided with a sound source circuit 34. However, in a configuration in which the keyboard instrument 100 is provided with a sound generating mechanism such as a string striking mechanism 91, the sound source circuit 34 may be omitted. The detection system 20 is used to record the performance of the keyboard instrument 100. The sound generating mechanism and the sound source circuit 34 are collectively referred to as a sound generating unit that generates sounds in response to the results of detection by the detection system 20.

[0098] As can be understood from the above explanation, the present disclosure is specified as an apparatus (musical performance operation apparatus) that controls musical tones by supplying operation signals corresponding to performance actions to a sound source circuit 34 or a sound generation mechanism. In addition to musical instruments (keyboard instruments 100) equipped with a sound source circuit 34 or a sound generation mechanism as exemplified in the above embodiments, the concept of an instrument playing apparatus also encompasses devices that do not have a sound source circuit 34 or a sound generation mechanism (for example, a MIDI controller or the pedal mechanism described above). In other words, the musical performance operation apparatus in the present disclosure is a device that is operated by a performer (operator) for performance.

[0099] (13) In the above-described embodiments, the first coil 51 includes the first section 511 and the second section 512. However, the first coil 51 does not necessarily have to be formed of two coils. The first coil 51 may be formed of a single coil (for example, only one of the first section 511 and the second section 512). Similarly, the second coil 61 does not necessarily have to be formed of two coils (the third section 611 and the fourth section 612).

[0100] (14) In each of the above-described embodiments, the detected part 50 may include, for example, a metal plate instead of the first coil 51. The detected part 50 may include a magnetic material in which an induced current is generated by electromagnetic induction due to a magnetic field generated in the second coil 61. The first coil 51 is an example of a magnetic material.

[0101] J: Notes From the above-described exemplary embodiments, the following configurations can be understood, for example.

[0102] A performance operation device according to one aspect (aspect 1) of the present disclosure comprises a movable member that displaces in response to a performance action, a magnetic body installed on the movable member, a coil facing the magnetic body and generating a magnetic field when supplied with current, a detection system that generates a detection signal at a level corresponding to the distance between the magnetic body and the coil, and an electromagnetic shield for blocking electromagnetic waves emitted from the detection system. In the above aspect, EMI countermeasures are realized by the electromagnetic shield for blocking electromagnetic waves emitted from the detection system including the magnetic body and the coil. Therefore, the impact of electromagnetic waves emitted from the detection system on surrounding electronic devices can be reduced. In addition, the impact of elements located near the detection system on the magnetic field around the coil can also be reduced.

[0103] In a specific example (Aspect 2) of Aspect 1, a support body is further provided that supports the movable member, and the electromagnetic shield includes a first shielding portion provided on the movable member and a second shielding portion provided on the support body. In the above aspect, since the electromagnetic shield includes the first shielding portion provided on the movable member and the second shielding portion provided on the support body, more effective EMI countermeasures are achieved compared to a configuration in which an electromagnetic shield is provided on only one of the support body and the movable member.

[0104] In a specific example (Aspect 3) of Aspect 2, the first shield portion includes a first base portion, and the coil is located between the magnetic body and the first base portion. According to the above aspect, since the coil is located between the magnetic body and the first base portion, the first shield portion can effectively block electromagnetic waves radiated from the magnetic body on the opposite side of the coil.

[0105] In a specific example (Aspect 4) of Aspect 3, the movable member faces the support body, and the first shield portion includes a first side wall portion that protrudes from the first base portion toward the support body. According to the above aspect, since the first shield portion includes the first side wall portion, electromagnetic waves radiated from the magnetic body to the surroundings can be effectively shielded.

[0106] In a specific example (Aspect 5) of any one of Aspects 2 to 4, at least a portion of the first shield portion is embedded in the movable member. According to the above aspects, since at least a portion of the first shield portion is embedded in the movable member, EMI countermeasures are achieved without significantly changing the original outline of the movable member.

[0107] In a specific example (Aspect 6) of Aspect 2, the second shield portion includes a second base portion, and the coil is located between the magnetic body and the second base portion. According to the above aspect, since the coil is located between the magnetic body and the second base portion, the second shield portion can effectively block electromagnetic waves radiated from the coil to the side opposite the magnetic body.

[0108] In a specific example (Aspect 7) of Aspect 6, the movable member faces the support body, and the second shield portion includes a second side wall portion that protrudes from the second base portion toward the movable member. According to the above aspect, since the second shield portion includes the second side wall portion, electromagnetic waves radiated from the coil to the surroundings can be effectively shielded.

[0109] A specific example (Aspect 8) of Aspects 2 to 7 of the performance operation device includes a base on which the coil is installed and an adjustment member that adjusts the distance between the base and the second shield part. According to the above aspects, it is possible to change the magnetic field generated in the coil by adjusting the distance between the second shield part and the base.

[0110] In a specific example of Aspect 1 (Aspect 9), the electromagnetic shield surrounds the magnetic body and the coil. According to the above aspect, since the electromagnetic shield surrounds the magnetic body and the coil, effective EMI countermeasures are realized.

[0111] In a specific example (Aspect 10) of Aspect 9, the movable member is a long key that constitutes the keyboard of a keyboard instrument, and the electromagnetic shield includes a first portion located in a first direction along the long side of the key relative to the magnetic body and the coil, a second portion located in a second direction opposite to the first direction relative to the magnetic body and the coil, a third portion located above the magnetic body and the coil, and a fourth portion located below the magnetic body and the coil. According to the above aspect, the electromagnetic shield surrounds the magnetic body and the coil, thereby achieving effective EMI countermeasures.

[0112] A keyboard instrument according to one embodiment (embodiment 11) of the present disclosure includes a key that moves in response to playing actions, a magnetic body installed on the key, and a coil facing the magnetic body that generates a magnetic field when supplied with current; the keyboard instrument is equipped with a detection system that generates a detection signal at a level corresponding to the distance between the magnetic body and the coil, an electromagnetic shield for blocking electromagnetic waves emitted from the detection system, and a sound generating unit that generates sound corresponding to the detection signal. [Explanation of symbols]

[0113] 100...keyboard instrument (music operation device), 10...keyboard, 12...key, 122...mounting surface, 124...protrusion, 126, 127...shielding portion, 14...support, 19...stopper, 20...detection system, 200...casing, 21...signal processing circuit, 22...supply circuit, 23...output circuit, 30...information processing device, 300...casing, 31...control device, 32...storage device, 33...converter, 34...sound source circuit, 40...sound emission device, 50...detected portion, 51...first coil, 511...first section, 512...second section, 514...connecting wiring, 52...capacitive element, 55...substrate, 60...signal generation portion, 61...second coil, 611...third section, 612...fourth section, 614...connecting Wiring, 62, 63...capacitive element, 65...substrate, 70...electromagnetic shield, 71...first shield portion, 71a...first base portion, 71b1, 71b2...first side wall portion, 72...second shield portion, 72a...second base portion, 72b1, 72b2...second side wall portion, 81...fixing member, 90...urge body, 91...striking mechanism, 911...hammer, 912...transmission mechanism, T1...input terminal, T2...output terminal, Wa...inner wall surface, Wa1...first portion, Wa2...second portion, Wa3...third portion, Wa4...fourth portion, Wb...inner wall surface, Wb1...first portion, Wb2...second portion, Wb3...third portion, Wb4...fourth portion, G1, G2...fulcrum portion, 141, 142...fulcrum support portion.

Claims

1. a plurality of movable members that are displaced in response to playing actions; a substrate on which a plurality of coils are provided to generate a magnetic field for detecting displacement of the plurality of movable members; an electromagnetic shield including a shield portion overlapping the plurality of coils in a plan view; a holding member that holds the base material at a position spaced apart from the shielding portion; A performance operation device comprising:

2. Further comprising a support for supporting the plurality of movable members; The shielding portion is installed on the support.

2. The performance operation device according to claim 1.

3. The shield portion is a base portion located on the opposite side of the movable member from the plurality of coils; a side wall portion protruding from the base portion toward the movable member; 3. The performance operation device according to claim 1 or 2.

4. The actuator further includes a plurality of first coils respectively installed on the plurality of movable members.

4. A performance operation device according to claim 1.

5. The movable member further includes a plurality of capacitance elements respectively provided on the plurality of movable members, A resonant circuit including the capacitive element and the first coil is formed in each of the plurality of movable members.

5. The performance operation device according to claim 4.

6. The electromagnetic shield includes a first shield portion provided on each of the plurality of movable members.

6. The performance operation device according to claim 4 or 5.

7. The first coil is located between the coil and the first shield part.

7. The performance operation device according to claim 6.

8. The first shield part is a first base portion located on an opposite side of the first coil from the first coil; a first side wall portion protruding from the first base portion toward the coil; 8. The performance operation device according to claim 6 or 7.

9. At least a portion of the first shield portion is embedded in the movable member.

9. A performance operation device according to any one of claims 6 to 8.

10. The holding member is an adjustment member for adjusting the distance between the base material and the shielding portion.

10. A performance operation device according to any one of claims 1 to 9.

11. A plurality of keys that change position in response to playing actions; a base material on which a plurality of coils are disposed to generate a magnetic field for detecting displacement of the plurality of keys; an electromagnetic shield including a shield portion overlapping the plurality of coils in a plan view; a holding member that holds the base material at a position spaced apart from the shielding portion; a sound generating unit that generates sounds according to displacements of the plurality of keys; A keyboard instrument comprising:

Images