Performance operation device and keyboard instrument

Abstract

A keyboard instrument has a key which is displaced in correspondence with a performance action, a detection system which includes a first coil and a second coil, generates a detection signal of an electric level corresponding to a distance between the first coil and the second coil, the first coil is provided to the key, the second coil is opposite to the first coil and generates a magnetic field by supply of an electric current, and an electromagnetic shield for shielding electromagnetic waves radiated from the detection system.

Description

Technical Field

[0001] This invention relates to a performance control device for use in performance. Background Technology

[0002] Various techniques have been proposed for detecting the displacement of movable parts, such as keys in a keyboard instrument. Patent Document 1 discloses a structure in which the position of each key is detected using a first coil mounted on the frame of the keyboard instrument and a second coil mounted on each key. In this structure, if the second coil is displaced by pressing a key, the current flowing in the first coil changes. By detecting the current flowing in the first coil, a detection signal indicating the presence or absence of a key press is generated.

[0003] Patent Document 1: US Patent No. 4,580,478 Summary of the Invention

[0004] However, in the technology of Patent Document 1, there is a problem that electromagnetic waves caused by the current supplied to each coil can affect other electronic devices located around the keyboard instrument. In view of the above, one object of the present invention is to implement EMI (Electromagnetic Interference) countermeasures for a system for detecting the position of movable parts such as keys.

[0005] To address the above-mentioned issues, one aspect of the present invention relates to a performance operation device comprising: a movable part that displaces in accordance with a performance action; a detection system comprising a magnetic body disposed on the movable part and a coil opposite to the magnetic body that generates a magnetic field through the supply of current, generating a detection signal of a level corresponding to the distance between the magnetic body and the coil; and an electromagnetic shield for shielding electromagnetic waves radiated from the detection system.

[0006] One aspect of the present invention relates to a keyboard musical instrument comprising: keys that are displaced in accordance with playing actions; a detection system comprising a magnetic body disposed on the keys and a coil opposite the magnetic body that generates a magnetic field through the supply of current, generating a detection signal of a level corresponding to the distance between the magnetic body and the coil; an electromagnetic shield for shielding electromagnetic waves radiated from the detection system; and a sound generation unit for generating a sound corresponding to the detection signal. Attached Figure Description

[0007] Figure 1 This is a block diagram illustrating the structure of the keyboard musical instrument according to the first embodiment.

[0008] Figure 2 This is a block diagram illustrating the structure of a keyboard musical instrument.

[0009] Figure 3 This is the circuit diagram of the signal generation section.

[0010] Figure 4 This is the circuit diagram of the part being tested.

[0011] Figure 5 This is a block diagram illustrating the structure of a signal processing circuit.

[0012] Figure 6 This is a top view of the key as seen from the signal generation section.

[0013] Figure 7 This is a top view illustrating the specific structure of the part being inspected.

[0014] Figure 8 yes Figure 7 A sectional view of line a-a.

[0015] Figure 9 This is an explanatory diagram of the magnetic field generated by the first coil in the tested section.

[0016] Figure 10 This is a top view of the signal generation unit as seen from the key side.

[0017] Figure 11 This is a top view illustrating the specific structure of the signal generation unit.

[0018] Figure 12 yes Figure 11 A cross-sectional view along line b-b.

[0019] Figure 13 This is an explanatory diagram of the magnetic field generated by the second coil of the signal generation unit.

[0020] Figure 14 This is a top view of the signal generation unit in the second embodiment.

[0021] Figure 15 yes Figure 14 A cross-sectional view of the c-c line.

[0022] Figure 16 This is a top view of the second shielding part in the second embodiment.

[0023] Figure 17 This is a top view of the second shielding part in a modified example of the second embodiment.

[0024] Figure 18 This is a top view of the part being tested in the third embodiment.

[0025] Figure 19 yes Figure 18 A cross-sectional view of the d-d line.

[0026] Figure 20 This is a top view of the first shielding part in the third embodiment.

[0027] Figure 21 This is a cross-sectional view of the signal generation unit in the fourth embodiment.

[0028] Figure 22 This is a cross-sectional view of the part being inspected in the fifth embodiment.

[0029] Figure 23 This is a schematic diagram of the detection system according to the sixth embodiment.

[0030] Figure 24 This is a schematic diagram of the detection system according to the seventh embodiment.

[0031] Figure 25 This is a schematic diagram of the detection system according to the eighth embodiment.

[0032] Figure 26 This is a cross-sectional view of the first shielding part involved in the modified example. Detailed Implementation

[0033] A: Implementation Method 1

[0034] Figure 1 This is a block diagram illustrating the structure of a keyboard musical instrument 100 according to a first embodiment of the present invention. The keyboard musical instrument 100 (an example of a "playing operation device") is an electronic musical instrument having a keyboard 10, a detection system 20, an information processing device 30, and a sound reproduction device 40. The keyboard 10 is composed of multiple keys 12 (an example of "movable parts") including multiple white keys and multiple black keys. Each of the multiple keys 12 is a movable part that moves in accordance with the user's playing action. The detection system 20 detects the position of each key 12. The information processing device 30 generates an acoustic signal V corresponding to the detection result of the detection system 20. The acoustic signal V is a signal representing a musical tone corresponding to the pitch of the key 12 operated by the user. The sound reproduction device 40 reproduces the sound represented by the acoustic signal V. For example, a speaker or headphones are used as the sound reproduction device 40.

[0035] Figure 2 This is a block diagram illustrating the specific structure of the keyboard instrument 100, focusing on one key 12 of the keyboard 10. Imagine the X-axis and Y-axis. Multiple keys 12 are arranged along the X-axis. The Y-axis is orthogonal to the X-axis. The XY plane is a horizontal plane. Each key 12 is arranged along the Y-axis in its length direction. That is, the Y-axis is the axis along the long side of each key 12. Hereinafter, the view from a direction perpendicular to the XY plane will be described as "view from above".

[0036] Each key 12 of the keyboard 10 is supported on a support body 14 with a fulcrum (balance pin) 13 as a fulcrum. The support body 14 is a structure (frame) that supports the various elements of the keyboard instrument 100. The end 121 of each key 12 is displaced in the plumb line by the user pressing and releasing the key. The detection system 20 generates a detection signal D of a level corresponding to the position Z of the end 121 in the plumb line for each of the plurality of keys 12. The position Z is represented by the amount of displacement of the end 121 with reference to the position of the end 121 in the released state when no load is applied to the key 12.

[0037] The detection system 20 includes a detection unit 50, a signal generation unit 60, a substrate 65, and a signal processing circuit 21. The detection unit 50 and the signal generation unit 60 are provided for each key 12. The signal generation unit 60 is provided on the support body 14. The detection unit 50 is provided on the key 12. Specifically, the detection unit 50 is provided on the bottom surface (hereinafter referred to as the "setting surface") 122 of the key 12. The detection unit 50 includes a first coil 51 (an example of a "magnetic body"). The signal generation unit 60 includes a second coil 61 (an example of a "coil"). The first coil 51 and the second coil 61 are spaced apart from each other in the plumb direction. The distance between the signal generation unit 60 and the detection unit 50 (the distance between the first coil 51 and the second coil 61) varies correspondingly to the position Z of the end 121 of the key 12.

[0038] Figure 3 This is a circuit diagram illustrating the electrical structure of the signal generation unit 60. The signal generation unit 60 has a resonant circuit that includes an input terminal T1, an output terminal T2, a second coil 61, a capacitor element 62, and a capacitor element 63. The second coil 61 is connected between the input terminal T1 and the output terminal T2. The capacitor element 62 is connected between the input terminal T1 and a ground wire, and the capacitor element 63 is connected between the output terminal T2 and a ground wire. The signal generation unit 60 functions as a low-frequency removal filter to suppress low-frequency components of the signal supplied to the input terminal T1.

[0039] Figure 4 This is a circuit diagram illustrating the electrical structure of the detection unit 50. The detection unit 50 has a resonant circuit, which includes a first coil 51 and a capacitor element 52. The two ends of the first coil 51 and the two ends of the capacitor element 52 are connected to each other. The resonant frequency of the detection unit 50 is the same as the resonant frequency of the signal generation unit 60. However, the resonant frequency of the detection unit 50 and the resonant frequency of the signal generation unit 60 may also be different.

[0040] Figure 2 The signal processing circuit 21 generates a detection signal D that corresponds to the level of the distance between the first coil 51 and the second coil 61. Figure 5This is a block diagram illustrating the specific functional structure 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 plurality of signal generation units 60. The reference signal R is a current signal or voltage signal with a periodically varying level. For example, a periodic signal of any 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 generation unit 60 in a time-division manner. Specifically, the supply circuit 22 is a demultiplexer that sequentially selects each of the plurality of signal generation units 60 and supplies the reference signal R to the selected signal generation unit 60. That is, the reference signal R is supplied to each of the plurality of signal generation units 60 in a time-division manner. Furthermore, the period of the reference signal R is sufficiently short compared to the time length during which the supply circuit 22 selects one signal generation unit 60. Additionally, the frequency of the reference signal R is approximately the same as the resonant frequency of the signal generation unit 60 and the detection unit 50. However, the frequency of the reference signal R and the resonant frequency of the signal generation unit 60 and the detection unit 50 may also be different.

[0041] like Figure 3 As illustrated, a reference signal R is supplied to the input terminal T1 of the signal generation unit 60. A magnetic field is generated in the second coil 61 by supplying a current corresponding to the reference signal R to the second coil 61. An induced current is generated in the first coil 51 through 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 of the second coil 61. The magnetic field generated in the first coil 51 changes corresponding to the distance between the first coil 51 and the second coil 61. Therefore, a detection signal d with 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 generation unit 60. The detection signal d is a periodic signal whose level varies with the same period as the reference signal R.

[0042] Figure 5 The output circuit 23 generates a detection signal D by arranging the detection signals d sequentially output from each of the plurality of signal generation units 60 on a time axis. That is, the detection signal D is a voltage signal with an amplitude level δ corresponding to the distance between the first coil 51 and the second coil 61 of each key 12. As mentioned 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 is a signal corresponding to the position Z of each of the plurality of keys 12. The detection signal D generated by the output circuit 23 is supplied to the information processing device 30.

[0043] Figure 2The information processing device 30 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 implemented by a computer system having 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.

[0044] The control device 31 consists of one or more processors that control various elements of the keyboard instrument 100. For example, the control device 31 consists of one or more processors such as CPU (Central Processing Unit), SPU (Sound Processing Unit), DSP (Digital Signal Processor), FPGA (Field Programmable Gate Array), or ASIC (Application Specific Integrated Circuit).

[0045] Storage device 32 is a single or multiple memory devices that store the program executed by control device 31 and the data used by control device 31. Storage device 32 is constructed from known recording media such as magnetic recording media or semiconductor recording media. Alternatively, storage device 32 may be constructed from a combination of various recording media. In addition, portable recording media that can be attached to or detached from keyboard instrument 100, or external recording media (e.g., network hard drive) that can communicate with keyboard instrument 100 may be used as storage device 32.

[0046] The control device 31 analyzes the detection signal D converted by the A / D converter 33 to determine the position Z of each key 12. Furthermore, the control device 31 instructs the sound source circuit 34 to produce the musical tone corresponding to the position Z of each key 12. The sound source circuit 34 generates an acoustic signal V representing the musical tone indicated by the control device 31. That is, the sound source circuit 34 generates an acoustic signal V corresponding to the amplitude level δ of the detection signal D. For example, the volume of the acoustic signal V is controlled corresponding to the amplitude level δ. By supplying the acoustic signal V from the sound source circuit 34 to the playback device 40, the playback device 40 reproduces the musical tone corresponding to the user's playing action (pressing or releasing each key 12). Alternatively, the function of the sound source circuit 34 can be realized by the control device 31 executing a program stored in the storage device 32.

[0047] The detection system 20 radiates electromagnetic waves through the magnetic field generated from the first coil 51 and the magnetic field generated from the second coil 61. Figure 2The electromagnetic shield 70 is utilized as a countermeasure against EMI (Electromagnetic Interference) caused by electromagnetic waves radiated from the detection system 20 affecting other electronic devices located in the vicinity. Specifically, the electromagnetic shield 70 is a barrier used to shield electromagnetic waves radiated from the detection system 20. The electromagnetic shield 70 is formed of a magnetic or conductive material. For example, the electromagnetic shield 70 is formed of a metal.

[0048] Specifically, the electromagnetic shield 70 is formed to surround the detection system 20. The electromagnetic shield 70 of the first embodiment includes a first shielding portion 71 and a second shielding portion 72. The first shielding portion 71 is a barrier for shielding electromagnetic waves radiated from the detected unit 50. On the other hand, the second shielding portion 72 is a barrier for shielding electromagnetic waves radiated from the signal generating unit 60. The first shielding portion 71 is provided on the key 12, and the second shielding portion 72 is provided on the support body 14. The specific structures of the first shielding portion 71 and the second shielding portion 72 will be described later.

[0049] Figure 6 This is a top view of the key 12 as seen from the signal generation unit 60 side. A detection unit 50 is provided for each key 12. A first shielding unit 71 is provided for each detection unit 50 (first coil 51). Figure 7 This is a top view illustrating the specific structure of the inspected part 50. Figure 7 The image shows a top view of the detected unit 50 from the signal generation unit 60 side. Additionally, Figure 8 yes Figure 7 A sectional view of line a-a.

[0050] The detection unit 50 in 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-shaped member including surfaces F1 and F2. Surface F2 is the surface of the key 12 opposite to the mounting surface 122. Surface F1 is the surface opposite to surface F2. Therefore, surface F1 is opposite to the signal generation unit 60. The width of the substrate 55 is less than the width of one key 12.

[0051] The first coil 51 is a conductive film formed on the surface of the substrate 55 (surface F1 and surface F2). Specifically, the first coil 51 is formed by selectively removing the patterning of the conductive film covering the entire surface of the substrate 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 surface F1. The first section 511 and the second section 512 are formed in different regions when viewed from a top view perpendicular to surface F1. Specifically, the first section 511 and the second section 512 are adjacent to each other along the length direction (Y-axis) of the bond 12.

[0052] The first section 511 is a spiral portion that rotates clockwise from the inner peripheral end Ea1 to the outer peripheral end Ea2. On the other hand, the second section 512 is a spiral portion that rotates clockwise from the inner peripheral end Eb1 to the outer peripheral end Eb2.

[0053] The first coil 51 includes a connecting wire 514 formed on the surface F2 of the substrate 55. Ends Ea1 and Eb1 are connected to each other via the connecting wire 514. In addition, a capacitor element 52 mounted on the surface F1 is located between ends Ea2 and Eb2.

[0054] As understood from the above explanation, the direction of the current flowing in the first section 511 is opposite to the direction of the current flowing in the second section 512. Specifically, when the current in direction Q1 flows through the first section 511, the current in direction Q2, opposite to direction Q1, flows through the second section 512. Therefore, as... Figure 9 As illustrated, magnetic fields in opposite directions occur in the first interval 511 and the second interval 512. That is, a magnetic field is formed from one of the first interval 511 and the second interval 512 toward the other.

[0055] like Figure 8 As illustrated, in the first embodiment, the first shielding portion 71 is embedded in the key 12. The first shielding portion 71 is formed to overlap with the first coil 51 when viewed from above. Specifically, the first shielding portion 71 includes a first base portion 71a, a first sidewall portion 71b1, and a first sidewall portion 71b2. The first base portion 71a is the portion located on the opposite side of the second coil 61 when viewed from the first coil 51. That is, 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-shaped member parallel to the substrate 55. Figure 6 As illustrated, when viewed from above, the first coil 51 is located inside the first base portion 71a. The first base portion 71a is formed, for example, covering the entire range of the transverse direction (X-axis direction) of the key 12.

[0056] like Figure 8 As illustrated, the first sidewall portions 71b1 and 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 mounting surface 122. The first sidewall portions 71b1 and 71b2 are formed along the periphery of the first base portion 71a along the X-axis. The first sidewall portion 71b1 is formed along the periphery of the first base portion 71a in the negative direction of the Y-axis along the X-axis. The first sidewall portion 71b2 is formed along the periphery of the first base portion 71a in the positive direction of the Y-axis along the X-axis. Figure 6As illustrated, the first coil 51 is located between the first sidewall portion 71b1 and the first sidewall portion 71b2. Alternatively, one or both of the first sidewall portion 71b1 and the first sidewall portion 71b2 may be omitted.

[0057] Electromagnetic waves radiated from the first coil 51 are shielded by the first shielding portion 71. In the first embodiment, the first shielding portion 71 includes a first base portion 71a, therefore, as... Figure 9 As illustrated, the electromagnetic waves radiated from the magnetic body can be shielded more effectively from the opposite side of the coil via the first shielding portion 71. In addition, the first shielding portion 71 includes a first sidewall portion 71b1 and a first sidewall portion 71b2, and therefore has the ability to effectively shield electromagnetic waves radiated from the first coil 51 to the surroundings.

[0058] Figure 10 This is a top view of the signal generation unit 60 as seen from the side of key 12. A second coil 61 is provided for each of the first coils 51. The second shielding portion 72 of the first embodiment is continuously provided across the plurality of keys 12. That is, the second shielding portion 72 is formed in a strip shape along the X-axis. Figure 11 This is a top view illustrating the specific structure of the signal generation unit 60. Figure 11 The image shows a top view of the signal generation unit 60 as seen from the side of the detected unit 50. Additionally, Figure 12 yes Figure 11 A cross-sectional view along line b-b.

[0059] like Figure 11 As illustrated, the signal generation unit 60 is constructed from a wiring board containing the second coil 61. The signal generation unit 60 is formed on a substrate 65. The substrate 65 is a continuous, elongated plate-like component with multiple bonds 12 distributed throughout it. Figure 12 As illustrated, the substrate 65 is a plate-shaped component comprising surfaces F3 and F4. Surface F4 is opposite to the second base portion 72a. Surface F3 is the surface opposite to surface F4. Therefore, surface F3 is opposite to the detected portion 50. Alternatively, the substrate 65 may be provided individually for each key 12.

[0060] like Figure 11As illustrated, the second coil 61 is a conductive film formed on the surface of the substrate 65 (surfaces F3 and F4). Specifically, a plurality of second coils 61 are formed by selectively removing the patterning of the conductive film covering the entire surface of the substrate 65. A plurality of second coils 61 corresponding to different bonds 12 are formed on the substrate 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 surface F3. The third section 611 and the fourth section 612 are formed in different regions when viewed from a direction perpendicular to surface F3. Specifically, the third section 611 and the fourth section 612 are adjacent to each other along the length direction of the bond 12.

[0061] The third section 611 is a spiral portion that rotates counterclockwise from the inner circumferential end Ec1 to the outer circumferential end Ec2. Conversely, the fourth section 612 is a spiral portion that rotates from the inner circumferential end Ed1 to the outer circumferential end Ed2. The distance between the first coil 51 and the second coil 61, in the direction of the central axis of the second coil 61 (i.e., the direction perpendicular to surface F3), varies correspondingly to the position Z of the key 12.

[0062] The second coil 61 includes a connecting wiring 614 formed on surface F4 of substrate 65. Ends Ec1 and Ed1 are interconnected via the connecting wiring 614. Additionally, input terminal T1 and output terminal T2 are formed on surface F3. Capacitor element 62 is connected between input terminal T1 and end Ec2 of third section 611. Capacitor element 63 is connected between output terminal T2 and end Ed2 of fourth section 612. The wiring connecting capacitor elements 62 and 63 is connected to a ground point G set to ground potential.

[0063] As understood from the above explanation, the direction of the current flowing in the third interval 611 is opposite to the direction of the current flowing in the fourth interval 612. Specifically, while the current in direction Q3 flows through the third interval 611, the current in direction Q4, opposite to direction Q3, flows through the fourth interval 612. Therefore, as... Figure 13 As illustrated, magnetic fields in opposite directions occur in the third interval 611 and the fourth interval 612. That is, a magnetic field is formed from one of the third interval 611 and the fourth interval 612 toward the other.

[0064] like Figure 12As illustrated, the second shielding portion 72 is provided on the surface of the support 14. Specifically, when viewed from above, the second shielding portion 72 is provided at a position overlapping with the plurality of second coils 61. The second shielding portion 72 of the first embodiment includes a second base portion 72a, a second sidewall portion 72b1, and a second sidewall portion 72b2. The second base portion 72a is the portion located on the opposite side of the first coil 51 when viewed from the second coil 61. That is, the second coil 61 is located between the first coil 51 and the second base portion 72a. Figure 10 As illustrated, the second base portion 72a in the first embodiment is a strip-shaped plate member extending along the X-axis. For example, the second base portion 72a extends from one end of the keyboard 10 to the other end. The second base portion 72a is provided on the surface of the support 14.

[0065] like Figure 10 As illustrated, the second sidewall portion 72b is a portion that protrudes from the second base portion 72a toward the key 12. The second sidewall portion 72b1 and the second sidewall portion 72b2 are formed along the periphery of the second base portion 72a along the X-axis. The second sidewall portion 72b1 is formed along the periphery of the second base portion 72a in the negative direction of the Y-axis along the X-axis. The second sidewall portion 72b2 is formed along the periphery of the first base portion 71a in the positive direction of the Y-axis along the X-axis. Figure 10 As illustrated, the signal generation unit 60 (a plurality of second coils 61) is located between the second sidewall portion 72b1 and the second sidewall portion 72b2. Alternatively, one or both of the second sidewall portion 72b1 and the second sidewall portion 72b2 may be omitted.

[0066] like Figure 12 As illustrated, the substrate 65, on which the signal generation section 60 is formed, is disposed within a space surrounded by the second base section 72a, the second sidewall section 72b1, and the second sidewall section 72b2. In the first embodiment, the substrate 65 is supported by the second shielding section 72. Specifically, the substrate 65 is supported by a fixing member 81 disposed on the surface of the second base section 72a. The fixing member 81, for example, is formed of an insulating material and serves as a spacer that holds the substrate 65 at a distance from the second base section 72a. That is, the substrate 65 and the second shielding section 72 do not directly contact each other.

[0067] Electromagnetic waves radiated from the second coil 61 are shielded by the second shielding portion 72. In the first embodiment, the second shielding portion 72 can more effectively shield electromagnetic waves radiated from the second coil 61 from the opposite side of the first coil 51. Furthermore, the second shielding portion 72 includes a second sidewall portion 72b1 and a second sidewall portion 72b2, thus effectively shielding electromagnetic waves radiated from the second coil 61 to the surrounding area. For example, electromagnetic waves radiated from the second coil 61 in the direction of the Y-axis are shielded by the second sidewall portion 72b1 and the second sidewall portion 72b2.

[0068] As understood from the above description, in the first embodiment, EMI countermeasures are achieved by using an electromagnetic shield 70 to shield electromagnetic waves radiated from the detection system 20, which includes the first coil 51 and the second coil 61. Therefore, the impact of electromagnetic waves radiated from the detection system 20 on surrounding electronic equipment can be reduced. In particular, in the first embodiment, the electromagnetic shield 70 includes a first shielding portion 71 provided on the key 12 and a second shielding portion 72 provided on the support 14. Therefore, compared to a structure where the electromagnetic shield 70 is provided only on the support 14 and the key 12, a more effective EMI countermeasure can be achieved.

[0069] B: Implementation Method 2

[0070] The second embodiment will be described below. Furthermore, in the structures illustrated below, for elements that function the same as in the first embodiment, the reference numerals used in the description of the first embodiment will be retained, and their detailed descriptions will be appropriately omitted.

[0071] Figure 14 This is a top view of the signal generation unit 60 in the second embodiment. Figure 15 yes Figure 14 A cross-sectional view along line c-c. Additionally... Figure 16 This is a top view of the second shielding part 72 in the second embodiment. Figure 16 The diagram shows the substrate 65 being removed from... Figure 14 The state after removal.

[0072] The second base portion 72a of the second shielding portion 72, when viewed from above, includes region A20, region A21, and region A22. Region A21 is a strip-shaped region extending along the second sidewall portion 72b1 in the X-axis direction. Region A22 is a strip-shaped region extending along the second sidewall portion 72b2 in the X-axis direction. Region A20 is a strip-shaped region extending between region A21 and region A22 in the X-axis direction. As per... Figure 14 and Figure 15 As understood, the plurality of second coils 61 are arranged in the X-axis direction within the strip-shaped region overlapping region A20 when viewed from above on the surface F3 of the substrate 65. No second coils 61 are formed in the region of the substrate 65 that overlaps with regions A21 and A22.

[0073] like Figures 14 to 16 As illustrated, in the second embodiment, a plurality of openings O2 (O21, O22) are formed in the second base portion 72a. Each opening O2 is a through hole of a generally rectangular shape that penetrates the second base portion 72a.

[0074] Multiple openings O21 are formed in region A21 of the second base portion 72a. Specifically, when viewed from above, the multiple openings O21 are spaced apart from each other and arranged in the X-axis direction within region A21. Additionally, multiple openings O22 are formed in region A22 of the second base portion 72a. Specifically, when viewed from above, the multiple openings O22 are spaced apart from each other and arranged in the X-axis direction within region A22. On the other hand, no openings O2 are formed in region A20. That is, each opening O2 in the second embodiment does not overlap with any of the multiple second coils 61 when viewed from above.

[0075] In the second embodiment, the same effect as in the first embodiment is achieved. Furthermore, in the structure where the second shielding portion 72 forms an opening O2, as in the second embodiment, the effect of the second shielding portion 72, which interferes with the magnetic field generated in the second coil 61, is mitigated by the opening O2. Therefore, the effect of the EMI countermeasures based on the second shielding portion 72 can be maintained to a reasonable extent, and a magnetic field is generated over a wide range around the second coil 61. By expanding the range of the magnetic field of the second coil 61, the range of the position Z of the key 12 where the magnetic field changes is expanded. That is, the range within which the position Z of the key 12 can be detected is easily ensured.

[0076] Furthermore, the shape (e.g., planar shape or number) of the openings O2 in the second shielding portion 72 is arbitrary. For example, in Figure 16 The diagram illustrates a structure with multiple openings O21 arranged along the X-axis, but a single opening O21 extending along the X-axis can also be formed within region A21. Similarly, instead of multiple openings O22 arranged along the X-axis, a single opening O22 extending along the X-axis can be formed within region A22.

[0077] Furthermore, in the above description, an opening O2 is formed in each of regions A21 and A22 of the second base portion 72a, but it can also be as follows: Figure 17 As illustrated, an opening O2 is formed within region A20 of the second base portion 72a. That is, one opening O2 extending along the X-axis is formed within region A20. When viewed from above, the opening O2 overlaps with a plurality of second coils 61. That is, when viewed from above, the plurality of second coils 61 are located inside the opening O2. Alternatively, a plurality of openings O2 spaced apart from each other and arranged in the X-axis direction may be formed within region A20.

[0078] C: Third Implementation Method

[0079] Figure 18 This is a top view of key 12 as seen from the signal generation unit 60 side. Figure 19 yes Figure 18 A cross-sectional view of the d-d line. Additionally... Figure 20This is a top view of the first shielding part 71 in the third embodiment. Figure 20 The diagram shows multiple detected parts 50 from... Figure 18 The state after removal.

[0080] The first base portion 71a of the first shielding portion 71, when viewed from above, includes regions A10, A11, and A12. Region A11 is the region adjacent to the first sidewall portion 71b1. Region A12 is the region adjacent to the first sidewall portion 71b2. Region A10 is the region between regions A11 and A12. As per... Figure 18 and Figure 19 As understood, the first coil 51 is formed in the area of ​​surface F1 of substrate 55 that overlaps with region A10 when viewed from above. The first coil 51 is not formed in the area of ​​substrate 55 that overlaps with regions A11 and A12.

[0081] like Figures 18 to 20 As illustrated, in the third embodiment, a plurality of openings O1 (O11, O12) are formed in the first base portion 71a. Each opening O1 is a through hole of a generally rectangular shape that penetrates the first base portion 71a.

[0082] An opening O11 is formed in region A11 of the first base portion 71a. An opening O12 is formed in region A12 of the first base portion 71a. On the other hand, no opening O1 is formed in region A10. That is, each opening O1 in the third embodiment does not overlap with the first coil 51 when viewed from above.

[0083] In the third embodiment, the same effect as in the first embodiment is achieved. Furthermore, in the structure where the opening O1 is formed in the first shielding portion 71 as in the third embodiment, the effect of the first shielding portion 71, which interferes with the magnetic field generated in the first coil 51, is mitigated by the opening O1. Therefore, the effect of the EMI countermeasures based on the first shielding portion 71 can be adequately maintained, and a sufficient magnetic field is generated in the first coil 51. By expanding the range of the magnetic field of the first coil 51, the range of the position Z of the key 12 where the magnetic field changes is expanded. That is, the range within which the position Z of the key 12 can be detected is easily ensured.

[0084] Alternatively, multiple openings O1 may be formed in each of regions A11 and A12. Additionally, one or more openings O1 that overlap with the first coil 51 when viewed from above may be formed in region A10. Alternatively, the openings O1 in region A11 or region A12 may be omitted.

[0085] D: Implementation Method 4

[0086] Figure 21 This is a cross-sectional view of the signal generation unit 60 in the fourth embodiment. Figure 21The screw 821 is used to fix the substrate 65 and the second shielding portion 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 portion 72. The spring 822 is located between the substrate 65 and the second shielding portion 72 (second base portion 72a). The spring 822 is a coil spring that surrounds the screw 821. The spring 822 applies force to the substrate 65 in a direction away from the support 14.

[0087] In the above structure, the distance (gap) between the substrate 65 and the second shield 72 changes correspondingly to the tightness of the screw 821. That is, the screw 821 and the spring 822 function as adjustment components for adjusting the distance between the substrate 65 and the second shield 72. The magnetic field generated by the second coil 61 changes correspondingly to the distance between the substrate 65 and the second shield 72. Furthermore, by adjusting the distance between the substrate 65 and the second shield 72, the distance between the first coil 51 and the second coil 61 also changes. That is, the adjustment component implemented 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.

[0088] In the fourth embodiment, the same effect as in the first embodiment is achieved. Furthermore, in the fourth embodiment, the distance between the substrate 65 and the second shielding portion 72 is adjusted by adjusting the components (screw 821 and spring 822), thereby enabling adjustment of the magnetic field generated in the second coil 61.

[0089] Furthermore, the method for adjusting the distance between the substrate 65 and the second shielding portion 72 is not limited to the examples described above. For example, the distance between the two can also be adjusted by selectively positioning any one of a plurality of fixing members 81 with different total lengths between the substrate 65 and the second shielding portion 72. That is, the fixing members 81 are used as adjusting members.

[0090] E: Fifth Implementation

[0091] Figure 22 This is a cross-sectional view of the detection unit 50 according to the fifth embodiment. The detection unit 50 is provided on the mounting surface 122 of the key 12 by means of a screw 831. A spring 832 is located between the surface F2 of the substrate 55 of the detection unit 50 and the mounting surface 122. The spring 832 is, for example, a coil spring surrounding the screw 831. The spring 832 applies force to the substrate 55 in a direction away from the mounting surface 122.

[0092] In the above structure, the distance between the substrate 55 and the first shield 71 changes correspondingly to the tightness of the screw 831. That is, the screw 831 and the spring 832 function as adjustment components for adjusting the distance between the substrate 55 and the first shield 71. The magnetic field generated by the first coil 51 changes correspondingly to the distance between the substrate 55 and the first shield 71. Furthermore, by adjusting the distance between the substrate 55 and the first shield 71, the distance between the first coil 51 and the second coil 61 also changes. That is, the adjustment component implemented 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.

[0093] In the fifth embodiment, the same effect as in the first embodiment is achieved. Furthermore, in the fifth embodiment, the distance between the substrate 55 and the first shielding portion 71 is adjusted by adjusting the components (screw 831 and spring 832), thereby enabling adjustment of the magnetic field generated in the first coil 51.

[0094] Furthermore, the method for adjusting the distance between the substrate 55 and the first shielding portion 71 is not limited to the examples described above. For example, the distance between the two can also be adjusted by selectively positioning any one of a plurality of fixing members of different lengths between the substrate 55 and the first shielding portion 71.

[0095] F: Implementation Method 6

[0096] Figure 23 This is a schematic diagram of the detection system 20 according to the sixth embodiment. Similar to the first embodiment, the detection system 20 generates a detection signal D of a level corresponding to the position Z of the end 121 in the direction of the plumb bob for each of the plurality of keys 12.

[0097] Each key 12 is supported on the support body 14 by using the fulcrum portion G1 as a fulcrum. The fulcrum portion G1 is provided on the support body 14 via the support fulcrum portion 141 provided on the support body 14. That is, the key 12 is supported on the support body 14 via the fulcrum portion G1 and the support fulcrum portion 141. The key 12 rotates about the fulcrum portion G1 as the center.

[0098] The key 12 in the sixth embodiment has a protrusion 124. The protrusion 124 is a portion that protrudes from the mounting surface 122 at the end 121. The protrusion 124 is displaced in the plumb line by the user pressing and releasing the key. The front end of the protrusion 124 is curved.

[0099] The keyboard instrument 100 of the sixth embodiment includes a frame 200 and a force-applying body 90. The frame 200 is a hollow structure disposed on a support 14. A protrusion 124 passes through an opening formed in the frame 200. The force-applying body 90 is a structure used to provide the user with a tactile feedback when pressing the keys. A force-applying body 90 is provided for each of the plurality of keys 12. A plurality of force-applying bodies 90 are housed inside the frame 200. Specifically, the force-applying body 90 is supported on the support 14 with a fulcrum G2 as a fulcrum. The fulcrum G2 is disposed on the frame 200 via a fulcrum support 142 disposed in the internal space of the frame 200. That is, the force-applying body 90 is supported on the support 14 via the fulcrum G2, the fulcrum support 142, and the frame 200.

[0100] When the force-applying body 90 is not pressed, it abuts against the stop 19 located inside the frame 200. If the force-applying body 90 is pressed by the front end of the protrusion 124 via a button, the force-applying body 90 rotates about the fulcrum G2, moving away from the stop 19. Furthermore, a hammer N is provided inside the end of the force-applying body 90 opposite to the detected part 50 for adding weight to that end. Therefore, when the force-applying body 90 is pressed by the protrusion 124, a moderate resistance is provided to the user. That is, it provides a good tactile feedback to the player.

[0101] The detection part 50 is disposed on the force-applying body 90. For example, it is disposed on the surface of the force-applying body 90 opposite to the protrusion 124. In the sixth embodiment, the detection part 50 is disposed at a position that overlaps with the protrusion 124 when viewed from above. Furthermore, the position of the detection part 50 on the force-applying body 90 is arbitrary. For example, the detection part 50 may also be disposed on the surface of the force-applying body 90 on the side of the protrusion 124. On the other hand, the signal generation part 60 is disposed on the inner wall surface Wa of the frame 200. The second coil 61 of the signal generation part 60 is disposed such that it overlaps with the first coil 51 of the detection part 50 when viewed from above.

[0102] The force-applying body 90, which is equipped with the first coil 51, is displaced due to the button press. Therefore, similar to the first embodiment, the detection system 20 generates a detection signal D with a level corresponding to the distance between the first coil 51 and the second coil 61.

[0103] The inner wall surface Wa of the frame 200 is formed of a magnetic or conductive material. The inner wall surface Wa of the frame 200 surrounds the first coil 51 and the second coil 61. That is, the inner wall surface Wa of the frame 200 functions as an electromagnetic shield to shield electromagnetic waves radiated from the detection system 20. The inner wall surface Wa (i.e., electromagnetic shield) of the sixth embodiment includes a first part Wa1, a second part Wa2, a third part Wa3, and a fourth part Wa4.

[0104] Part 1 Wa1 is located in the negative direction of the Y-axis (an example of "first direction") relative to the first coil 51 and the second coil 61. Part 2 Wa2 is located in the positive direction of the Y-axis (an example of "second direction") relative to the first coil 51 and the second coil 61. Part 3 Wa3 is located above the first coil 51 and the second coil 61. Part 4 Wa4 is located below the first coil 51 and the second coil 61. Furthermore, a shielding part 126, which functions as electromagnetic shielding, may be embedded in the protrusion 124 of the key 12 at a position corresponding to the opening of the frame 200. The shielding part 126 is formed of a magnetic material or a conductive material. The shielding part 126 (an example of "third part") is located above the first coil 51 and the second coil 61.

[0105] In the sixth embodiment, the inner wall surface Wa, which acts as an electromagnetic shield, surrounds the first coil 51 and the second coil 61, thus enabling effective EMI countermeasures.

[0106] G: Implementation Method 7

[0107] Figure 24 This is a schematic diagram of the detection system 20 according to the seventh embodiment. In the seventh embodiment, the positions of the detected unit 50 and the signal generation unit 60 are different from those in the sixth embodiment.

[0108] The keyboard instrument 100 of the seventh embodiment has a frame 300 instead of a frame 200. The frame 300 is a hollow structure and is provided on the support 14. One frame 300 is provided for each of the plurality of keys 12. The end 128 of each key 12 opposite to the end 121 (the side supported on the support 14) is received in the internal space of the frame 300. Each key 12 passes through a through hole in the frame.

[0109] In the seventh embodiment, the detection unit 50 is disposed on the mounting surface 122 of the key 12 within the internal space of the frame 300. The signal generation unit 60 is disposed on the inner wall surface Wb of the frame 300 at a position opposite to the detection unit 50. That is, the inner wall surface Wb of the frame 300 surrounds the first coil 51 and the second coil 61.

[0110] The inner wall surface Wb of the frame 300 is formed of a magnetic or conductive material. The inner wall surface Wb of the frame 300 surrounds the first coil 51 and the second coil 61. That is, the inner wall surface Wb of the frame 300 functions as an electromagnetic shield to shield electromagnetic waves radiated from the detection system 20. The inner wall surface Wb (i.e., electromagnetic shield) of the seventh embodiment includes a first part Wb1, a second part Wb2, a third part Wb3, and a fourth part Wb4.

[0111] Part 1, Wb1, is located in the negative direction of the Y-axis relative to the first coil 51 and the second coil 61. Part 2, Wb2, is located in the positive direction of the Y-axis relative to the first coil 51 and the second coil 61. Part 3, Wb3, is located above the first coil 51 and the second coil 61. Part 4, Wb4, is located below the first coil 51 and the second coil 61. Furthermore, a shielding portion 127, serving as electromagnetic shielding, may be embedded in the key 12 at a position corresponding to the opening of the frame 300. For example, the shielding portion 127 may be formed of a magnetic or conductive material. The shielding portion 127 (an example of "part 2") is located in the positive direction of the Y-axis relative to the first coil 51 and the second coil 61.

[0112] In the seventh embodiment, similarly to the sixth embodiment, the inner wall surface Wb, which acts as an electromagnetic shield, surrounds the first coil 51 and the second coil 61, thus enabling effective EMI countermeasures. Furthermore, for example, in the case of omitting... Figure 24 In the structure of the frame 300, the hammer N, formed 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 unit 50 or the signal generation unit 60. In the seventh embodiment, a portion of the frame 300 is located between the hammer N and the detection system 20 (the detection unit 50 and the signal generation unit 60), thus reducing the influence of the hammer N on the detection system 20. That is, it is possible to suppress the influence of elements located near the detection system 20 (e.g., the hammer N) on the magnetic field used for position Z detection. Therefore, it also has the advantage of being able to detect the position Z of each key 12 with high accuracy. Furthermore, in the seventh embodiment, the force-applying body 90 can be omitted.

[0113] H: Implementation Method 8

[0114] In the eighth embodiment, the structure of applying the detection system 20 to the striking mechanism 91 of the keyboard instrument 100 is illustrated. Figure 25 This is a schematic diagram illustrating the structure of the detection system 20 according to the eighth embodiment. The striking mechanism 91, similar to that of a piano, is an action mechanism that strikes a string (not shown) in conjunction with the displacement of each key 12 of the keyboard 10. Specifically, the striking mechanism 91 has, for each key 12: a hammer 911 capable of striking the string by rotation; 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 structure, the detection system 20 detects the displacement of the hammer 911 (an example of a "movable part").

[0115] In the eighth embodiment, the detection part 50 is disposed on the hammer 911 (e.g., hammer shank). The first shielding part 71 of the eighth embodiment is embedded in the hammer 911. The first shielding part 71, like in the first embodiment, includes a first base part 71a, a first sidewall part 71b1, and a first sidewall part 71b2, and is disposed at a position that overlaps with the first coil 51 when viewed from above.

[0116] The signal generation unit 60 is provided on the support body 14, similar to that in the first embodiment. The support body 14 in the eighth embodiment is, for example, a structure that supports the striking mechanism 91. Alternatively, the detection unit 50 may be provided on a component other than the hammer 911 of the striking mechanism 91. The second shielding portion 72, similar to that in the first embodiment, includes a second base portion 72a, a second sidewall portion 72b1, and a second sidewall portion 72b2. Similar to the first embodiment, the signal generation unit 60 is supported by the second shielding portion 72 (second base portion 72a) provided on the surface of the support body 14 via a fixing member 81. In the eighth embodiment, the same effects as in the first embodiment are achieved. Furthermore, the structures of the second to sixth embodiments can also be applied to the eighth embodiment.

[0117] I: Variation Example

[0118] The following examples illustrate specific variations that can be added to the methods illustrated above. Two or more methods selected from the examples below may be combined, provided they do not contradict each other.

[0119] (1) In the aforementioned embodiments, key 12 and force-applying body 90 are shown as movable parts, but the movable parts are not limited to key 12 and force-applying body 90. The movable part can be any part that moves in accordance with playing. For example, a detection system 20 can be applied to the pedal mechanism of the keyboard instrument 100. The pedal mechanism includes: a pedal, which is operated by the user with their foot; and a support body 14, which supports the pedal. In the above structure, the detection system 20 detects the displacement of the pedal. For example, a detection part 50 is provided on the pedal, and a signal generation part 60 is provided on the support body 14 opposite to the detection part 50. The pedal is an example of a movable part.

[0120] As understood from the above examples, the object detected by the detection system 20 is generally defined as a movable part that moves in accordance with a playing action. Movable parts include not only playing operation components such as keys 12 or pedals that are directly operated by the user, but also structures such as hammers 911 that move in conjunction with the operation of the playing operation components. However, the movable parts of the present invention are not limited to components that move in accordance with a playing action. That is, movable parts are generally defined as components capable of displacement, regardless of the cause of the displacement.

[0121] (2) In all the aforementioned methods, as long as the detected part 50 is provided on the movable part and the signal generating part 60 is provided opposite to the detected part 50, the positions of the detected part 50 and the signal generating part 60 are arbitrary.

[0122] (3) In the first and eighth embodiments, the first shielding portion 71 includes a first base portion 71a, a first sidewall portion 71b1, and a first sidewall portion 71b2, but the structure of the first shielding portion 71 is not limited to the examples described above. For example, the first shielding portion 71 may have a structure in which only one of the first base portion 71a and the first sidewall portion 71b (71b1, 71b2) is present, or the first shielding portion 71 may have a portion different from the first base portion 71a and the first sidewall portion 71b (71b1, 71b2). Alternatively, the first shielding portion 71 may have a first sidewall portion in the first base portion 71a that protrudes from the periphery of the X-axis toward the support 14. As understood from the above description, the shape of the first shielding portion 71 is arbitrary.

[0123] (4) In the first and eighth embodiments, the second shielding portion 72 includes a second base portion 72a, a second sidewall portion 72b1, and a second sidewall portion 72b2, but the structure of the second shielding portion 72 is not limited to the examples described above. For example, the second shielding portion 72 may have only one of the second base portion 72a and the second sidewall portion 72b (72b1, 72b2), or the second shielding portion 72 may have a portion different from the second base portion 72a and the second sidewall portion 72b (72b1, 72b2). Alternatively, the second shielding portion 72 may have a second sidewall portion in the second base portion 72a that protrudes from the periphery of the X-axis toward the movable member. As understood from the above description, the shape of the second shielding portion 72 is arbitrary.

[0124] (5) In the first and eighth embodiments, the electromagnetic shield 70 includes a first shielding portion 71 and a second shielding portion 72, but the structure of the electromagnetic shield 70 is not limited to the examples above. For example, the electromagnetic shield 70 may also include only one of the first shielding portion 71 and the second shielding portion 72, or the electromagnetic shield 70 may include a portion that is different from the first shielding portion 71 and the second shielding portion 72.

[0125] (6) In the first embodiment, the entire first shielding portion 71 is embedded in the key 12, but it is sufficient that at least a portion of the first shielding portion 71 is embedded in the movable member. Furthermore, it is not necessary for the first shielding portion 71 to be embedded in the key 12. Figure 26As illustrated, for example, a first shielding portion 71 may be provided on the surface of the key 12, and the detection portion 50 may be provided on the surface of the first shielding portion 71 via a fixing member 81 formed of insulating material. Furthermore, in the eighth embodiment, the first shielding portion 71 may also not be entirely embedded in the hammer 911.

[0126] (7) In the first embodiment, the second shielding part 72 is provided on the surface of the support body 14, but the second shielding part 72 may also be embedded in the support body 14. In the above structure, for example, the signal generating part 60 is provided on the surface of the support body 14 at a position that overlaps with the second shielding part 72 when viewed from above.

[0127] (8) In the first and eighth embodiments, a second shielding part 72 may also be provided for each key 12.

[0128] (9) In the sixth embodiment, the entire frame 200 may also be formed of a magnetic or conductive material. That is, the entire frame 200 functions as an electromagnetic shield for shielding electromagnetic waves radiated from the detection system 20. In the seventh embodiment, the entire frame 300 may also be formed of a magnetic or conductive material in the same way.

[0129] (10) In the sixth and seventh embodiments, the inner wall surface (Wa or Wb) of the frame (200 or 300) is used as electromagnetic shielding, but the frame may not be used as electromagnetic shielding. That is, a component different from the frame may also be used as electromagnetic shielding. The portion of the electromagnetic shielding located in the negative direction of the Y-axis relative to the first coil 51 and the second coil 61 is generally represented as the first part, and the portion of the electromagnetic shielding located in the positive direction of the Y-axis relative to the first coil 51 and the second coil 61 is generally represented as the second part. In addition, the portion of the electromagnetic shielding located above the first coil 51 and the second coil 61 is generally represented as the third part, and the portion of the electromagnetic shielding located below the first coil 51 and the second coil 61 is generally represented as the fourth part. Furthermore, the first shielding portion 71 can be considered an example of the third part, and the second shielding portion 72 can be considered an example of the fourth part. Electromagnetic shielding may consist of only a portion of Part 1, Part 2, Part 3, and Part 4, or it may consist of a portion that is different from Part 1, Part 2, Part 3, and Part 4.

[0130] (11) In the sixth embodiment, a frame 200 may also be provided for each force-applying body 90. Similarly, in the seventh embodiment, a frame 300 may also be provided for each key 12.

[0131] (12) In the aforementioned embodiments, the keyboard instrument 100 is shown to have a structure with a sound source circuit 34. However, in a structure where the keyboard instrument 100 has a sound-producing mechanism such as a 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-producing mechanism and the sound source circuit 34 are generally represented as a sound-generating unit that generates sound in accordance with the detection result of the detection system 20.

[0132] As understood from the above description, the present invention can also be specifically defined as a device (instrument playing apparatus) for controlling musical tones by outputting an operation signal corresponding to a playing action to the sound source circuit 34 or the sound-producing mechanism. As illustrated in the foregoing embodiments, devices that do not have a sound source circuit 34 or a sound-producing mechanism (e.g., a MIDI controller or the aforementioned pedal mechanism 92), other than musical instruments (keyboard instruments 100), are included in the concept of an instrument playing apparatus. That is, the instrument playing apparatus of the present invention is generally represented as a device operated by a performer (operator) for playing.

[0133] (13) In the foregoing embodiments, a structure is shown in which the first coil 51 includes a first section 511 and a second section 512, but the structure in which the first coil 51 is formed by two coils is not necessary. The first coil 51 may also be formed by one coil (for example, only one of the first section 511 and the second section 512). Similarly, for the second coil 61, a structure in which it is formed by two coils (the third section 611 and the fourth section 612) is not necessary.

[0134] (14) In the aforementioned embodiments, the detection unit 50 may replace the first coil 51 and include, for example, a metal plate. The detection unit 50 may simply have a magnetic material that generates an induced current through electromagnetic induction generated by the magnetic field generated by the second coil 61. The first coil 51 is an example of a magnetic material.

[0135] J: Appendix

[0136] Based on the methods illustrated above, one can, for example, grasp the following structure.

[0137] One aspect (Aspect 1) of the present invention relates to a performance operation device comprising: a movable part that displaces in response to a performance action; a detection system comprising a magnetic body disposed on the movable part and a coil opposite the magnetic body that generates a magnetic field through the supply of current, generating a detection signal of a level corresponding to the distance between the magnetic body and the coil; and an electromagnetic shield for shielding electromagnetic waves radiated from the detection system. In the above embodiment, EMI countermeasures are achieved through electromagnetic shielding for shielding electromagnetic waves radiated from the detection system comprising the magnetic body and the coil. Therefore, the impact of electromagnetic waves radiated from the detection system on surrounding electronic equipment can be reduced. Furthermore, the influence of elements located near the detection system on the magnetic field around the coil can also be reduced.

[0138] In a specific example of Method 1 (Method 2), the playing operation device further includes a support body for supporting the movable part, and the electromagnetic shielding includes: a first shielding portion provided on the movable part; and a second shielding portion provided on the support body. In the above method, the electromagnetic shielding includes a first shielding portion provided on the movable part and a second shielding portion provided on the support body. Therefore, compared with a structure in which electromagnetic shielding is provided only on one of the support body and the movable part, effective EMI countermeasures can be achieved.

[0139] In a specific example of Method 2 (Method 3), the first shielding portion includes a first base portion, and the coil is located between the magnetic body and the first base portion. According to the above method, since the coil is located between the magnetic body and the first base portion, electromagnetic waves radiated from the magnetic body can be shielded more effectively from the opposite side of the coil via the first shielding portion.

[0140] In a specific example of Method 3 (Method 4), the movable member is opposite to the support body, and the first shielding portion includes a first sidewall portion protruding from the first base portion toward the support body. According to the above method, the first shielding portion includes the first sidewall portion, thus effectively shielding electromagnetic waves radiated from the magnetic body to the surroundings.

[0141] In a specific example (method 5) of any of methods 2 to 4, at least a portion of the first shielding part is embedded in the movable member. According to the above method, since at least a portion of the first shielding part is embedded in the movable member, EMI countermeasures can be achieved without significantly altering the original approximate shape of the movable member.

[0142] In a specific example of Method 2 (Method 6), the second shielding portion includes a second base portion, and the coil is located between the magnetic body and the second base portion. According to the above method, since the coil is located between the magnetic body and the second base portion, electromagnetic waves radiated from the coil can be shielded more effectively from the opposite side of the magnetic body via the second shielding portion.

[0143] In a specific example of Method 6 (Method 7), the movable member is opposite to the support body, and the second shielding portion includes a second sidewall portion protruding from the second base portion toward the movable member. According to the above method, the second shielding portion includes a second sidewall portion, thus effectively shielding electromagnetic waves radiated from the coil to the surroundings.

[0144] Specific examples of methods 2 to 7 (method 8) involve a performance operation device comprising: a substrate on which the coil is disposed; and an adjustment member for adjusting the distance between the substrate and the second shield. According to the above method, the magnetic field occurring in the coil can be changed by adjusting the distance between the second shield and the substrate.

[0145] In a specific example of Method 1 (Method 9), the electromagnetic shield surrounds the magnetic body and the coil. According to the above method, the electromagnetic shield surrounds the magnetic body and the coil, thus enabling effective EMI countermeasures.

[0146] In a specific example of Method 9 (Method 10), the movable part is a long, narrow key constituting the keyboard of a keyboard musical instrument. The electromagnetic shield comprises: a first portion located in a first direction relative to the magnet and the coil along the long side of the key; a second portion located in a second direction opposite to the first direction relative to the magnet and the coil; a third portion located above the magnet and the coil; and a fourth portion located below the magnet and the coil. According to the above method, the electromagnetic shield surrounds the magnet and the coil, thus enabling effective EMI countermeasures.

[0147] One aspect (aspect 11) of the present invention relates to a keyboard instrument comprising: keys that are displaced in accordance with a playing action; a detection system comprising a magnetic body disposed on the keys and a coil opposite the magnetic body that generates a magnetic field through the supply of an electric current, generating a detection signal of a level corresponding to the distance between the magnetic body and the coil; an electromagnetic shield for shielding electromagnetic waves radiated from the detection system; and a sound generation unit for generating a sound corresponding to the detection signal.

[0148] Explanation of the label

[0149] 100…Keyboard instrument (playing operation device), 10…Keyboard, 12…Key, 122…Setting surface, 124…Protrusion, 126, 127…Shielding part, 14…Support body, 19…Stop, 20…Detection system, 200…Frame, 21…Signal processing circuit, 22…Supply circuit, 23…Output circuit, 30…Information processing device, 300…Frame, 31…Control device, 32…Storage device, 33…Converter, 34…Sound source circuit, 40…Sound playback device, 50…Detected part, 51…First coil, 511…First interval, 512…Second interval, 514…Connecting wiring, 52…Capacitor element, 55…Substrate, 60…Signal generation part, 61…Second coil, 611…Third interval, 612…Fourth interval, 614…Connecting… Wiring, 62, 63…capacitor element, 65…substrate, 70…electromagnetic shield, 71…first shielding part, 71a…first base part, 71b1, 71b2…first side wall part, 72…second shielding part, 72a…second base part, 72b1, 72b2…second side wall part, 81…fixing component, 90…force-applying body, 91…strike mechanism, 911…hammer, 912…transmission mechanism, T1…input terminal, T2…output terminal, Wa…inner wall surface, Wa1…first part, Wa2…second part, Wa3…third part, Wa4…fourth part, Wb…inner wall surface, Wb1…first part, Wb2…second part, Wb3…third part, Wb4…fourth part, G1, G2…fulcrum part, 141, 142…fulcrum support part.

Claims

1. A performance operation device, comprising: a plurality of movable members which displace in correspondence with a performance action; a detection system which includes a plurality of magnetic bodies provided respectively to the plurality of movable members and a plurality of coils which oppose respectively to the plurality of magnetic bodies and generate a magnetic field by supply of electric current, and generates a detection signal of a level corresponding to a distance between the magnetic bodies and the coils; an electromagnetic shield which includes a shield portion which is continuous throughout the plurality of coils, for shielding electromagnetic waves radiated from the detection system; and a support body which supports the plurality of movable members, the movable members oppose to the support body, the electromagnetic shield further includes a first shield portion provided respectively to the plurality of movable members, the first shield portion includes a first base portion and a first side wall portion which projects from the first base portion toward the support body.

2. The performance operation device according to claim 1, wherein the shield portion is provided to a support body which supports the plurality of movable members.

3. The performance operation device according to claim 1, wherein the magnetic body is located between the coil and the first base portion.

4. The performance operation device according to claim 1, wherein at least a portion of the first shield portion is embedded in the movable member.

5. The performance operation device according to claim 1, wherein the shield portion includes a second base portion, the coil is located between the magnetic body and the second base portion.

6. The performance operation device according to claim 5, wherein the shield portion includes a second side wall portion which projects from the second base portion toward the movable member.

7. The performance operation device according to claim 1, comprising: a base material in which the plurality of coils are provided; and an adjustment member which adjusts a distance between the base material and the shield portion.

8. The performance operation device according to claim 1, wherein the electromagnetic shield surrounds the magnetic body and the coil.

9. The performance operation device according to claim 8, wherein the movable member is a long strip-shaped key which constitutes a keyboard of a keyboard instrument, the electromagnetic shield includes: a first portion which is located in a first direction along a long side of the key with respect to the magnetic body and the coil; a second portion which is located in a second direction opposite to the first direction with respect to the magnetic body and the coil; a third portion which is located above the magnetic body and the coil; and a fourth portion which is located below the magnetic body and the coil.

10. A performance operation device, comprising: a plurality of movable members which displace in correspondence with a performance action; a detection system which includes a plurality of magnetic bodies provided respectively to the plurality of movable members, a plurality of coils which oppose respectively to the plurality of magnetic bodies and generate a magnetic field by supply of electric current, and a base material in which the plurality of coils are provided, and generates a detection signal of a level corresponding to a distance between the magnetic bodies and the coils; an electromagnetic shield which includes a shield portion which is continuous throughout the plurality of coils, for shielding electromagnetic waves radiated from the detection system; and ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ a fixed member that holds the substrate at a position spaced apart from the shield.

11. The performance operation apparatus according to claim 10, wherein the shield is provided to a support body that supports the plurality of movable members.

12. The performance operation apparatus according to claim 10, wherein the electromagnetic shield surrounds the magnetic body and the coil.

13. The performance operation apparatus according to claim 12, wherein the movable member is a long strip-shaped key that constitutes a keyboard of a keyboard instrument, the electromagnetic shield includes: a first portion that is located in a first direction along a long side of the key with respect to the magnetic body and the coil; a second portion that is located in a second direction opposite to the first direction with respect to the magnetic body and the coil; a third portion that is located above the magnetic body and the coil; and a fourth portion that is located below the magnetic body and the coil.

14. A keyboard instrument having: a plurality of keys that displace in correspondence with a performance action; a detection system that includes a plurality of magnetic bodies provided respectively to the plurality of keys, a plurality of coils that oppose the plurality of magnetic bodies respectively and generate a magnetic field by supply of electric current, and generates a detection signal of a level corresponding to a distance between the magnetic body and the coil; an electromagnetic shield that includes a shield portion that is continuous throughout the plurality of coils, for shielding electromagnetic waves radiated from the detection system; a sound generation portion that generates a sound corresponding to the detection signal; and a support body that supports the plurality of keys, the key opposes the support body, the electromagnetic shield further includes a first shield portion provided respectively to the plurality of keys, the first shield portion includes a first base portion and a first side wall portion that protrudes from the first base portion toward the support body.

15. A keyboard instrument having: a plurality of keys that displace in correspondence with a performance action; a detection system that includes a plurality of magnetic bodies provided respectively to the plurality of keys, a plurality of coils that oppose the plurality of magnetic bodies respectively and generate a magnetic field by supply of electric current, and a substrate on which the plurality of coils are provided, and generates a detection signal of a level corresponding to a distance between the magnetic body and the coil; an electromagnetic shield that includes a shield portion that is continuous throughout the plurality of coils, for shielding electromagnetic waves radiated from the detection system; a fixed member that holds the substrate at a position spaced apart from the shield; and a sound generation portion that generates a sound corresponding to the detection signal. ​ ​

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