Keyboard device and performance operation device

Abstract

To simplify a manufacturing process of an operation device using a magnetic induction sensor.SOLUTION: A keyboard device includes: a magnetic induction sensor which has first and second substrates respectively including conductors and which measures the distance between the first and second substrates; keys operable by an operator; and a holding part holding the first substrate between the keys and the second substrate. A coil is included in at least one of the conductors provided at each of the first and second substrates. The holding part supports the first substrate. The first substrate includes a notch or opening when viewed in a direction orthogonal to a surface on which the conductor of the first substrate is provided and a part of the holding part is provided at the notch or opening.SELECTED DRAWING: Figure 20

Description

[Technical Field]

[0001] The present invention relates to a performance operation device. [Background technology]

[0002] Electronic keyboard instruments detect key presses and generate sound signals based on the detection results. Key press detection is achieved using contact or non-contact sensors. Some non-contact sensors can also be used as distance sensors, allowing for continuous measurement of key press amounts. This allows key movement to be accurately reflected in the sound produced, and can also be used to detect aftertouch.

[0003] Non-contact sensors include, for example, optical sensors. Compared to magnetic induction sensors, optical sensors are more susceptible to the effects of external light and dirt. For example, electronic keyboard instruments use grease in their moving parts. If this grease splashes, the optical sensor may become dirty. Such sensors are also sometimes used in acoustic pianos equipped with sound generators. In the case of an acoustic piano, part of the casing (for example, the roof panel) may be opened when playing, which can result in the sensor being affected by external light.

[0004] A non-contact sensor that is not affected by such influences is, for example, a magnetic induction sensor (for example, Patent Document 1). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] U.S. Patent No. 4,580,478 Summary of the Invention [Problem to be solved by the invention]

[0006] Since magnetic induction sensors are non-contact, one side of the circuit board on which the coil is located must be attached to a part that moves when a key is pressed, so it is attached to each key. Because keyboard instruments use many keys, there is a need to streamline the process of attaching circuit boards to each key during the manufacturing process of keyboard instruments.

[0007] One object of the present invention is to simplify the manufacturing process of a performance operation device that uses a magnetic induction sensor. [Means for solving the problem]

[0008] According to one embodiment of the present invention, there is provided a musical performance operation device including a distance sensor, a manipulator, and a holding unit. The distance sensor includes a first substrate and a second substrate, each having a conductor arranged thereon, and measures the distance between the first substrate and the second substrate. The manipulator can be operated by an operator. The holding unit holds the first substrate between the manipulator and the second substrate and moves integrally with the manipulator.

[0009] According to one embodiment of the present invention, there is provided a musical performance operation device comprising a distance sensor, a manipulator, and a holding unit. The distance sensor includes a first substrate and a second substrate, each having a conductor arranged thereon, and measures the distance between the first substrate and the second substrate. The manipulator can be operated by an operator. The first member is linked to the manipulator. The holding unit holds the first substrate between the first member and the second substrate, and moves integrally with the first member. .

[0010] The operating element and the holding portion may be made of the same material.

[0011] The first member and the holding portion may be made of the same material.

[0012] The first member may include an elastically deformable portion, and the distance between the first substrate and the second substrate may change as the first member elastically deforms upon receiving a force from the operator. In this case, the first member may receive the force from the operator directly or indirectly via another member.

[0013] The holding portion may detachably hold the first substrate.

[0014] The holding portion may include an elastic body, and when the elastic body is in a first state, the holding portion holds the first substrate, and when the elastic body is in a second state in which it is more elastically deformed than the first state, the holding portion releases its hold on the first substrate.

[0015] The holding portion may include a first plate portion and a second plate portion, and the positional relationship between the first plate portion and the second plate portion may be changeable, and the holding portion may hold the first substrate when the first plate portion and the second plate portion are in a first state where the first substrate is sandwiched between them, and the holding portion may release the holding of the first substrate when the first plate portion and the second plate portion are in a second state where the first plate portion and the second plate portion are further apart than in the first state. [Effects of the Invention]

[0016] According to one embodiment of the present invention, the manufacturing process of a performance operation device that uses a magnetic induction sensor can be simplified. [Brief explanation of the drawings]

[0017] [Figure 1] 1 is a diagram illustrating a keyboard device according to a first embodiment of the present invention. [Figure 2] 1 is a diagram illustrating the internal structure of a keyboard device according to a first embodiment of the present invention (when a key is released). [Figure 3] 1 is a diagram illustrating the internal structure of a keyboard device according to a first embodiment of the present invention (when a white key is pressed). FIG. [Figure 4] 1A and 1B are diagrams illustrating an active circuit board according to a first embodiment of the present invention. [Figure 5] 1A and 1B are diagrams illustrating a passive circuit board according to a first embodiment of the present invention. [Figure 6] FIG. 2 is a diagram illustrating the board holder from which the passive circuit board has been removed in the first embodiment of the present invention. [Figure 7] FIG. 2 is a diagram illustrating a board holder to which a passive circuit board is attached in the first embodiment of the present invention. [Figure 8] 1 is a view of the substrate holder from which the fixing member has been removed, as viewed from below, in the first embodiment of the present invention. FIG. [Figure 9] FIG. 2 is a view illustrating a cross section (cutting line Ac1-Ac2) of the substrate holder in the first embodiment of the present invention. [Figure 10] FIG. 2 is a view illustrating a cross section (cutting line Bc1-Bc2) of the substrate holder in the first embodiment of the present invention. [Figure 11] FIG. 2 is a view illustrating a cross section (cutting line Bc1-Bc2) of a substrate holder to which a fixing member is attached in the first embodiment of the present invention. [Figure 12] FIG. 10 is a diagram illustrating a board holder from which a passive circuit board has been removed in a second embodiment of the present invention. [Figure 13] 10A and 10B are diagrams illustrating a board holder to which a passive circuit board is attached in a second embodiment of the present invention. [Figure 14] FIG. 10 is a diagram illustrating a board holder from which a passive circuit board has been removed in a third embodiment of the present invention. [Figure 15] 10A and 10B are diagrams illustrating a state in which a passive circuit board is placed on a board holder in a third embodiment of the present invention. [Figure 16] 10 is a diagram illustrating a cross section (cutting line Cc1-Cc2) in a state where a passive circuit board is placed on a board holder in a third embodiment of the present invention. FIG. [Figure 17] 17 is a diagram illustrating a cross section of the passive circuit board attached to the board holder by closing the cover in FIG. 16. FIG. [Figure 18] FIG. 10 is a diagram illustrating a board holder from which a passive circuit board has been removed in a fourth embodiment of the present invention. [Figure 19] FIG. 10 is a view illustrating a cross section (cutting line Dc1-Dc2) of a substrate holder in a fourth embodiment of the present invention. [Figure 20] 10A and 10B are diagrams illustrating a passive circuit board according to a fourth embodiment of the present invention. [Figure 21] 10A and 10B are diagrams illustrating a board holder to which a passive circuit board is attached in a fourth embodiment of the present invention. [Figure 22] 10A and 10B are diagrams illustrating a passive circuit board according to a fifth embodiment of the present invention. [Figure 23] FIG. 20 is a view for explaining a cross section (corresponding to FIG. 19) of a substrate holder in a fifth embodiment of the present invention. [Figure 24] FIG. 10 is a diagram illustrating the internal structure of a keyboard device according to a sixth embodiment of the present invention (when a key is released). [Figure 25] FIG. 10 is a diagram illustrating the internal structure of a keyboard device according to a sixth embodiment of the present invention (when a white key is pressed). [Figure 26] 13 is a diagram illustrating a board holder to which a passive circuit board is attached in a sixth embodiment of the present invention. FIG. [Figure 27] FIG. 13 is a diagram illustrating the internal structure of a keyboard device according to a seventh embodiment of the present invention (when a key is released). [Figure 28] FIG. 13 is a diagram illustrating the internal structure of a keyboard device according to a seventh embodiment of the present invention (when a white key is pressed). [Figure 29] FIG. 13 is a diagram illustrating a board holder to which a passive circuit board is attached in a seventh embodiment of the present invention. [Figure 30] FIG. 13 is a diagram illustrating the inside of a board holder to which a passive circuit board is attached in a seventh embodiment of the present invention (a diagram of the board holder viewed from below). [Figure 31] FIG. 13 is a view illustrating a cross section (cutting line Ec1-Ec2) of a substrate holder in a seventh embodiment of the present invention. [Figure 32] FIG. 13 is a diagram illustrating the inside of a board holder to which a passive circuit board is attached in an eighth embodiment of the present invention (a diagram of the board holder viewed from below). [Figure 33]FIG. 13 is a view illustrating a cross section (cutting line Fc1-Fc2) of a substrate holder in an eighth embodiment of the present invention. [Figure 34] FIG. 13 is a diagram illustrating a board holder to which a passive circuit board is attached in a ninth embodiment of the present invention. [Figure 35] FIG. 23 is a diagram illustrating the internal structure of a keyboard device according to a tenth embodiment of the present invention (when a key is released). [Figure 36] FIG. 23 is a diagram illustrating the mounting position of a substrate holder in a tenth embodiment of the present invention. [Figure 37] FIG. 23 is a view for explaining another example of the mounting position of the substrate holder in the tenth embodiment of the present invention. [Figure 38] FIG. 23 is a diagram illustrating the internal structure of a keyboard device according to an eleventh embodiment of the present invention (when a key is released). [Figure 39] FIG. 23 is a diagram illustrating the mounting position of a substrate holder in an eleventh embodiment of the present invention. [Figure 40] FIG. 23 is a view for explaining an example in which the substrate holder is attached in another form in the eleventh embodiment of the present invention. [Figure 41] FIG. 23 is a diagram illustrating a board holder to which a passive circuit board is attached in a twelfth embodiment of the present invention. [Figure 42] FIG. 23 is a view illustrating a cross section (cutting line Gc1-Gc2) of a substrate holder in a twelfth embodiment of the present invention. [Figure 43] FIG. 23 is a diagram illustrating a board holder to which a passive circuit board is attached in a thirteenth embodiment of the present invention. [Figure 44] FIG. 23 is a view illustrating a cross section (cutting line Hc1-Hc2) of a substrate holder in a thirteenth embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0018] A keyboard device according to one embodiment of the present invention will be described in detail below with reference to the drawings. The embodiment described below is merely an example of an embodiment of the present invention, and the present invention should not be construed as being limited to these embodiments. In the drawings referred to in this embodiment, identical parts or parts having similar functions are designated by the same or similar reference symbols (reference symbols consisting of a number followed by A, B, etc.), and repeated explanations may be omitted. Furthermore, for the sake of convenience, the dimensional proportions in the drawings may differ from the actual proportions, and some components may be omitted from the drawings.

[0019] First Embodiment In the first embodiment, a keyboard device used as an electronic keyboard instrument will be described. This keyboard device can detect key depression using a magnetic induction sensor. The key depression is detected, for example, as the position or posture of the key that moves when the key is depressed. The keyboard device will be described in detail below.

[0020] [1. Overview of the keyboard device] FIG. 1 is a diagram illustrating a keyboard device according to a first embodiment of the present invention. The keyboard device 1 is an electronic keyboard instrument, and in this example, an electronic piano. The keyboard device 1 includes keys 10, a housing 50, a speaker 60, a sound source unit 80, and an operation unit 90. For ease of explanation, in the following explanation, the side of the keyboard device 1 where the performer is located (the side where the keys 10 are located relative to the housing 50) is defined as the front side, and the side opposite the performer is defined as the rear side. Furthermore, left, right, and up and down are defined as directions as seen from the performer's perspective.

[0021] The multiple keys 10 are arranged in one direction. Here, the scale direction in which the multiple keys 10 are arranged is referred to as the left-right direction D1. In the following description, when distinguishing between left and right, the left direction is referred to as D1a and the right direction is referred to as D1b. The direction perpendicular to the left-right direction D1 is referred to as the front-back direction D2. When the keyboard device 1 is viewed from above, the longitudinal direction of the keys 10 is the same as the front-back direction D2. In the following description, when distinguishing between front and back, the front direction is referred to as D2a and the rear direction is referred to as D2b. The direction perpendicular to both the left-right direction D1 and the front-back direction D2 is referred to as the up-down direction D3 (see Figure 2). When the keyboard device 1 is placed flat, the up-down direction D3 roughly corresponds to the vertical direction. In other words, when the keyboard device 1 is placed flat, the left-right direction D1 and the front-back direction D2 are directions within a horizontal plane. In the following description, when distinguishing between up and down, the up direction is referred to as D3a and the down direction is referred to as D3b.

[0022] The key 10 can rotate relative to the housing 50. The rotation range of the key 10 is the state in which the longitudinal direction of the key 10 coincides with the front-to-rear direction D2. A speaker 60, a key depression amount measurement unit 70, a sound source unit 80, and an operation unit 90 are arranged in the housing 50. When a player (operator) operates the key 10, a sound is generated from the speaker 60 by the sound generation function of the keyboard device 1. The operation unit 90 is a device such as an operation button, a touch sensor, and a slider, and receives instructions for changing the type (tone) and volume of the sound to be generated, and outputs a signal corresponding to the input operation to the sound source unit 80. The keyboard device 1 may also include an interface for inputting and outputting signals to and from an external device. Examples of the interface include a terminal for outputting sound signals to an external device and a cable connection terminal for transmitting and receiving MIDI data.

[0023] The key press amount measurement unit 70 includes a magnetic induction sensor arranged for each of the multiple keys 10. The sensor corresponding to each key 10 detects the position (pressing amount) of the key 10 within its rotation range. The key press amount measurement unit 70 outputs key information identifying one of the multiple keys 10 and pressing amount information corresponding to the pressing amount of the identified key 10 to the sound source unit 80. The pressing amount information may indicate the pressing amount of the key 10 itself, or any value calculated from the pressing amount, such as the speed calculated from the change in pressing amount, or may be a combination of these. The combination of the key press amount measurement unit 70 and the keys 10 is an example of an input device. The detailed configuration of the key press amount measurement unit 70 will be described later.

[0024] The sound source unit 80 is a signal processing circuit that generates sound signals in response to performance operations on the keys 10. Specifically, the sound source unit 80 generates sound signals based on the information output from the key depression amount measurement unit 70, and outputs the generated sound signals to the speaker 60. The speaker 60 amplifies and outputs the sound signals output from the sound source unit 80, thereby generating sounds corresponding to the sound signals.

[0025] [2. Internal structure of keyboard device 1] Next, the internal structure of the keyboard device 1 will be described with reference to Figures 2 and 3, which show schematic cross sections of the keyboard device 1 cut along a plane having a normal in the left-right direction D1 (a plane including the front-rear direction D2 and the up-down direction D3).

[0026] Fig. 2 is a diagram illustrating the internal structure of a keyboard device according to a first embodiment of the present invention (when a key is released). Fig. 3 is a diagram illustrating the internal structure of a keyboard device according to a first embodiment of the present invention (when a white key is pressed). Of the keys 10, the configuration corresponding to the white key 10w is shown, and the configuration corresponding to the black key 10b is the same as the configuration corresponding to the white key 10w, so only the position of the black key 10b is shown and the other configurations are omitted.

[0027] The frame 20 is fixed to the housing 50 and supports a plurality of keys 10 arranged in the left-right direction D1. In this example, the frame 20 is made of a resin material. The frame 20 includes a key guide portion 201, a key support portion 203, a rib portion 205, and a board holder portion 207.

[0028] The key guide portion 201, located below the front end of the key 10, restricts movement of the key 10 in the left-right direction D1 by a member that slides against the key 10. The key support portion 203 supports an elastic portion 105 located at the rear end of the key 10. As the elastic portion 105 deforms in the up-down direction, the free end of the key 10 rotates around the key support portion 203. At this time, the key 10 rotates around an axis in the left-right direction D1 because its movement in the left-right direction D1 is restricted by the key guide portion 201. The rib portion 205 is a plate-shaped member having a surface that includes the front-rear direction D2 and the up-down direction D3 (a surface having the left-right direction D1 as its normal). Multiple rib portions 205 are arranged side by side in the left-right direction D1. Each of the multiple rib portions 205 is connected to the key guide portion 201, the key support portion 203, and the board holder 207, respectively.

[0029] The board holding unit 207 is a plate-like member that holds the active circuit board 700. In this example, the active circuit board 700 is disposed on the upper surface (key 10 side) of the board holding unit 207. A board holder 170 is fixed to the lower surface (board holding unit 207 side) of the key 10. The board holder 170 (holding unit) holds the passive circuit board 750 as described below.

[0030] As will be described later, the active circuit board 700 and the passive circuit board 750 are elements that make up a magnetic induction sensor, and are components included in the key depression amount measurement unit 70. The passive circuit board 750 is provided for each key 10. In this example, the active circuit board 700 is provided for multiple keys 10, but it may also be provided for each key 10.

[0031] The load unit 30 (first member) is disposed corresponding to each key 10. The load unit 30 and the key 10 are coupled and connected to each other at the key connecting portion 301 (sliding portion 307) of the load unit 30, thereby interlocking. The load unit 30 includes the key connecting portion 301, a bearing 303, and a weight portion 305. The bearing 303 is provided corresponding to a shaft portion provided on the frame 20. The key connecting portion 301 is disposed on the opposite side of the bearing 303 from the weight portion 305. The sliding portion 307 provided at one end of the key connecting portion 301 slides against the load connection portion 103 provided below the key 10. The center of gravity of the load unit 30 is located closer to the weight portion 305 than the bearing 303. Therefore, when the key 10 is not pressed, the weight portion 305 rests on the lower stopper 351 of the load unit 30, holding the key 10 in a rest position (corresponding to when the key is released). The lower stopper 351 and the upper stopper 353 are supported by the frame 20 .

[0032] When the key 10 is pressed in the state shown in FIG. 2, as shown in FIG. 3, the load section 30 rotates about the bearing 303 in conjunction with the rotation of the key 10, causing the weight section 305 to move upward and collide with the upper stopper 353, restricting further movement. At this time, the active circuit board 700 and the passive circuit board 750 move closer to each other, as shown in FIG. 3. The key press amount information output by the key press amount measurement section 70 described above is information corresponding to the distance between the active circuit board 700 and the passive circuit board 750 (i.e., the relative positional relationship between the active circuit board 700 and the passive circuit board 750). Note that the keyboard device 1 does not necessarily need to be provided with a load section 30. In this case, it is sufficient to provide a configuration that restricts the depression range of the key 10.

[0033] [3. Structure of key depression amount measurement unit 70] As described above, the key press amount measuring unit 70 includes an active circuit board 700 and a passive circuit board 750. The active circuit board 700 includes a coil (hereinafter referred to as an active coil) for generating a magnetic field using supplied power. When the passive circuit board 750, which includes a coil (hereinafter referred to as a passive coil), moves through this magnetic field, the active circuit 770 (see FIG. 4) anti-resonates depending on the position of the passive coil due to magnetic coupling. In other words, the circuit characteristics of the active circuit 770 change, and the output signal obtained from the active circuit board 700 changes. Therefore, the distance between the active circuit board 700 and the passive circuit board 750 can be measured based on the signal obtained from the active circuit board 700. In this way, the key press amount measuring unit 70 includes a distance sensor. Each component of the key press amount measuring unit 70 will be described in detail below.

[0034] [3-1. Structure of the active circuit board 700] 4 is a diagram illustrating an active circuit board according to a first embodiment of the present invention. The active circuit board 700 is a printed circuit board including multiple active circuits 770, a multiplexer 709, and various wiring (including a ground wiring 708, a clock signal line, a selection signal line, an input signal line, and an output signal line). The active circuit board 700 also includes a signal processing circuit (not shown). Each of the multiple active circuits 770 is provided for each key 10. The two wiring lines connecting the active circuit 770 and the multiplexer 709 correspond to a signal input unit 703a and a signal output unit 703b.

[0035] The active circuit 770 includes an active coil 701 (conductor), capacitors 706a and 706b, and resistors 707a and 707b. The active coil 701 is formed on a substrate. The wiring 701a is formed on the upper surface of the board (the key 10 side) and the wiring 701b is provided on the lower surface of the board (the board holding part 207 side). In Fig. 4, the configuration arranged on the lower surface of the board is indicated by dashed lines. The wiring 701a and wiring 701b connected to each other form an active coil 701 in which two coils (a first coil 701x and a second coil 701y) are connected in series.

[0036] The first coil 701x and the second coil 701y are arranged side by side along the front-rear direction D2, with their winding directions opposite to each other. The opposite winding directions here do not mean that the wires are wound in opposite directions structurally, but rather that they are wound so that currents flow in opposite directions when current is applied to the circuits. This also applies to the other embodiments and modified examples described below. Therefore, the magnetic flux generated by the active coil 701 is formed so that it passes through the second coil 701y immediately after leaving the first coil 701x.

[0037] Capacitors 706a and 706b are connected in series between both ends of the active coil 701. A ground wiring 708 is connected between the capacitors 706a and 706b. The ground wiring 708 is provided in common for each active circuit 770. A resistor 707a is connected between the capacitor 706a and the signal input section 703a, and a resistor 707b is connected between the capacitor 706b and the signal output section 703b.

[0038] When an AC signal is input to the signal input unit 703a via the multiplexer 709, the active coil 701 forms a magnetic field corresponding to the input signal, and the active coil 701 and the passive coil 751 are magnetically coupled together, modulating the signal output from the signal output unit 703b. The modulated signal is output via the multiplexer 709 to a signal processing circuit (not shown) and converted into key press information. The signal processing circuit outputs key information and key press information for the key 10 corresponding to the signal acquired by the multiplexer 709.

[0039] [3-2. Structure of Passive Circuit Board 750] FIG. 5 is a diagram illustrating a passive circuit board according to the first embodiment of the present invention. Surface 750a of passive circuit board 750 shown in FIG. 5 faces downward in the direction D3b in FIG. 2, and surface 750b faces upward in the direction D3a. Passive circuit board 750 is a printed circuit board including passive coil 751 (conductor) and capacitor 756. Passive coil 751 is formed on a board and, like active coil 701, includes two coils 751x and 751y wound in opposite directions. Coils 751x and 751y are connected via holes 751xt1, 751xt2, 751yt1, and 751yt2 that penetrate surface 750a and surface 750b. The wording "opposite winding directions" here does not mean that the wires are wound in opposite directions structurally, but rather that they are wound so that when induced currents are generated in the circuits, the currents flow in opposite directions. This also applies to the other embodiments and modified examples described below. A capacitor 756 is connected in series between both ends of the passive coil 751 (between coil 751x and coil 751y). In this example, the surface of the passive circuit board 750 (the surface on which the passive coil 751 is formed) is generally parallel to the top surface (operation surface) of the key 10. The capacitor 756 is located on surface 750a. Unless otherwise specified, the passive circuit boards in the following embodiments share the same configuration as the passive circuit board 750 described above.

[0040] 4. Structure of the substrate holder 170 Next, the structure of the board holder 170 that is fixed to the key 10 and holds the passive circuit board 750 will be described with reference to FIGS. 6 to 11. FIG.

[0041] FIG. 6 is a diagram illustrating a board holder from which a passive circuit board has been removed according to the first embodiment of the present invention. FIG. 7 is a diagram illustrating a board holder to which a passive circuit board has been attached according to the first embodiment of the present invention. FIG. 8 is a diagram illustrating a board holder from which a fixing member has been removed according to the first embodiment of the present invention, viewed from below. FIG. 9 is a diagram illustrating a cross section (cutting line Ac1-Ac2) of a board holder in the first embodiment of the present invention. FIG. 10 is a diagram illustrating a cross section (cutting line Bc1-Bc2) of a board holder in the first embodiment of the present invention. FIG. 11 is a diagram illustrating a cross section (cutting line Bc1-Bc2) of a board holder to which a fixing member has been attached according to the first embodiment of the present invention. The key 10 is disposed on the upward direction D3a of the board holder 170 shown in each figure. In other words, the board holder 170 is connected to the downward direction D3b surface of the key 10.

[0042] The key 10 and the substrate holder 170 are fixed together by a fixing member 190. The fixing member 190 is made of metal. The fixing member 190 is not limited to metal, and may be made of other materials such as resin. This also applies to the other embodiments and modified examples described below.

[0043] In this example, the substrate holder 170 is made of resin and manufactured by injection molding. The substrate holder 170 has a generally rectangular parallelepiped shape with a portion open. The portion open is due to limitations in injection molding manufacturing, and also to achieve the functions of the configuration described below. Note that the method of manufacturing the substrate holder 170 is not limited to injection molding, and it may be manufactured by other methods such as cutting. This also applies to the other embodiments and modified examples described below.

[0044] A plate-shaped bottom surface portion 179 is disposed on the upward direction D3a (key 10 side) of the substrate holder 170. A groove 1795c is disposed in the center of the bottom surface portion 179. The groove 1795c is a portion of the bottom surface portion 179 that becomes thinner along the front-rear direction D2. At both ends of the groove 1795c in the front-rear direction D2, through-holes 1795a, 1795b that penetrate the bottom surface portion 179 are disposed. As shown in FIGS. 6 and 11, the fixing member 190 includes a plate-shaped member 190c having a longitudinal length, and key embedding portions 190a, 190b that are bent in the same direction and approximately perpendicularly at both longitudinal ends of the plate-shaped member 190c. Plate-shaped member 190c is arranged along groove 1795c, and key-embedding portions 190a and 190b pass through through-holes 1795a and 1795b, respectively, to be embedded in and fixed to key 10. The thinned portion of bottom surface 179 in groove 1795c is sandwiched between plate-shaped member 190c and key 10, thereby fixing key 10 and substrate holder 170. By fixing the positional relationship between key 10 and substrate holder 170, substrate holder 170 moves integrally with key 10.

[0045] A protruding portion 177a is disposed to the left of the bottom surface portion 179 in the D1a direction via an elastic portion 1775a. The elastic portion 1775a is supported by the bottom surface portion 179 in a cantilevered manner and functions as an elastic body. The protruding portion 177a protrudes downward from the bottom surface portion 179 in the D3b direction. The protruding portion 177a can move in the up-down direction D3 as the elastic portion 1775a elastically deforms. A protruding portion 177b is disposed to the right of the bottom surface portion 179 in the D1b direction via an elastic portion 1775b. The elastic portion 1775b is supported by the bottom surface portion 179 in a cantilevered manner and functions as an elastic body. The protruding portion 177b protrudes downward from the bottom surface portion 179 in the D3b direction. The protruding portion 177b can move in the up-down direction D3 as the elastic portion 1775b elastically deforms. In this example, the raised portion 177a and the raised portion 177b are arranged to sandwich the groove portion 1795c.

[0046] A side surface portion 171a extending in the downward direction D3b is disposed at the end of the bottom surface portion 179 in the left direction D1a. A side surface portion 171b extending in the downward direction D3b is disposed at the end of the bottom surface portion 179 in the right direction D1b. A side surface portion 171b extending in the downward direction D3b is disposed at the end of the bottom surface portion 179 in the rear direction D2b. The side surface portion 178 extends in the direction D3b. The side surface portions 171a, 171b, and 178 are plate-shaped members that include a portion that is approximately perpendicular to the bottom surface portion 179.

[0047] Lid portions 172a and 173a extending toward the right direction D1b are disposed at the end of the side surface portion 171a in the downward direction D3b and at both ends in the front-rear direction. The lid portions 172a and 173a are plate-shaped members substantially parallel to the bottom surface portion 179. The lid portion 172a has a linear protrusion 1725a disposed on its surface facing the upward direction D3a (the surface facing the interior of the substrate holder 170). The linear protrusion 1725a is disposed along the front-rear direction D2. The lid portion 173a has a linear protrusion 1735a disposed on its surface facing the upward direction D3a (the surface facing the interior of the substrate holder 170). The linear protrusion 1735a is disposed along the front-rear direction D2.

[0048] Lid portions 172b, 173b extending toward the left direction D1a are disposed at the end of the side surface portion 171b in the downward direction D3b and at both ends in the front-rear direction. The lid portions 172b, 173b are plate-shaped members substantially parallel to the bottom surface portion 179. The lid portion 172b has a linear protrusion 1725b disposed on its surface facing the upward direction D3a (the surface facing the interior of the substrate holder 170). The linear protrusion 1725b is disposed along the front-rear direction D2. The lid portion 173b has a linear protrusion 1735b disposed on its surface facing the upward direction D3a (the surface facing the interior of the substrate holder 170). The linear protrusion 1735b is disposed along the front-rear direction D2.

[0049] A protruding portion 175 is disposed at an end of the bottom surface portion 179 in the forward direction D2a via an elastic portion 1755. The elastic portion 1755 functions as an elastic body by being cantilevered by the bottom surface portion 179. The protruding portion 175 protrudes downward in the direction D3b relative to the bottom surface portion 179, and its length in the front-to-rear direction D2 decreases as it moves downward in the direction D3b. The protruding portion 175 includes a portion on its surface on the rearward direction D2b side (the surface on the inner side of the substrate holder 170) that is approximately perpendicular to the bottom surface portion 179. When a force F is applied to the protruding portion 175 in the upward direction D3a, the elastic portion 1755 elastically deforms, causing the protruding portion 175 to move in the upward direction D3a. An opening 170a is formed in the front direction D2a of the substrate holder 170. By moving the protrusion 175 in the upward direction D3a, an opening 170a large enough to allow the passive circuit board 750 to be inserted into the board holder 170 is secured.

[0050] As the passive circuit board 750 is inserted into the board holder 170 through the opening 170a, the passive circuit board 750 moves the protruding portions 177a and 177b in the upward direction D3a, and eventually the passive circuit board 750 comes into contact with the side surface 178. When this state is reached, the protruding portion 175 returns to its original position. During this process, the capacitor 756 disposed on the passive circuit board 750 passes between the lid portion 172a and the lid portion 172b. Therefore, even if the capacitor 756 protrudes from the surface 750a, this does not hinder the insertion of the passive circuit board 750. Note that the protruding portion 175 may not return completely to its original position because it is in contact with the end face or edge of the passive circuit board 750. That is, the elastic portion 1755 may continue to be subjected to force F in the upward direction D3a by the passive circuit board 750, but the position of the raised portion 175 will return to at least the extent that the passive circuit board 750 cannot pass through the opening 170a.

[0051] When the passive circuit board 750 is housed in the board holder 170, its position in the left-right direction D1 is determined by its side surface portions 171a and 171b, and its position in the front-rear direction D2 is determined by its side surface portion 178 and the raised portion 175. The raised portions 177a and 177b that have been moved to the passive circuit board 750 tend to return to their original positions due to the restoring forces of the elastic portions 1775a and 1775b, respectively. Therefore, the raised portions 177a and 177b apply a force in the downward direction D3b to the passive circuit board 750, and the passive circuit board 750 is pressed against the linear protrusions 1725a, 1725b, 1735a, and 1735b. This determines the position of the passive circuit board 750 in the up-down direction D3. In this way, The flexible circuit board 750 is held by a board holder 170 .

[0052] Even if there is a certain tolerance for the position of the passive circuit board 750 in the left-right direction D1 and the front-back direction D2, the passive circuit board 750 is sandwiched in the up-down direction D3 by the board holder 170. Therefore, the passive circuit board 750 hardly moves while being held inside the board holder 170.

[0053] On the other hand, when the passive circuit board 750 is held by the board holder 170, a force F is applied to elastically deform the elastic portion 1755, moving the protruding portion 175 in the upward direction D3a and widening the opening 170a. This releases the passive circuit board 750 from being held by the board holder 170. In this way, the passive circuit board 750 is released from being held in a state (second state) in which the elastic portion 1755 is further elastically deformed than in the state (first state) of the elastic portion 1755 when the passive circuit board 750 is held by the board holder 170. In this state, the passive circuit board 750 can be removed from the board holder 170 by sliding the passive circuit board 750 toward the opening 170a.

[0054] As described above, with the keyboard device 1 according to the first embodiment of the present invention, the key depression amount measurement unit 70 uses a magnetic induction sensor to measure the amount of depression of the key 10. A passive circuit board 750 must be provided for each key 10. In this example, the board holder 170 fixed to the key 10 can hold or release the passive circuit board 750 by elastically deforming the elastic portion 1755, thereby removably holding the passive circuit board 750. This makes it easy to attach and detach the passive circuit board 750 to and from the board holder 170, which in turn simplifies the manufacturing process for the keyboard device 1 and improves maintainability.

[0055] Second Embodiment In the first embodiment, the key 10 and the substrate holder 170 are separate structures, and their relative positions are fixed via a fixing member 190. In the second embodiment, a substrate holder 170A formed integrally with the key 10 will be described with reference to Figures 12 and 13. In this example, the key 10 and the substrate holder 170A are integrally formed by injection molding and are made of the same material.

[0056] Fig. 12 is a diagram illustrating a board holder from which a passive circuit board has been removed according to the second embodiment of the present invention. Fig. 13 is a diagram illustrating a board holder to which a passive circuit board has been attached according to the second embodiment of the present invention. Board holder 170A is configured to be continuous with key 10 and includes a configuration similar to that of board holder 170. Side portions 171Aa, 171Ab, 178A and lid portions 172Aa, 172Ab are similar to the corresponding configurations in board holder 170, and therefore their description will be omitted. In board holder 170A, the configuration of opening 170Aa is different from opening 170a in board holder 170.

[0057] A protruding portion 175Aa is disposed at an end of the side surface portion 171Aa in the forward direction D2a and an end in the upward direction D3a via an elastic portion 1755Aa extending in the rightward direction D1b. The elastic portion 1755Aa functions as an elastic body by being cantilevered by the side surface portion 171Aa. The protruding portion 175Aa protrudes in the upward direction D3a relative to the elastic portion 1755Aa. The protruding portion 175Aa includes a portion on its surface on the rearward direction D2b side (the surface inside the substrate holder 170A) that is approximately perpendicular to the bottom surface portion 179A. When a force F is applied to the protruding portion 175Aa in the downward direction D3b, the elastic portion 1755Aa elastically deforms, causing the protruding portion 175Aa to move in the downward direction D3b.

[0058] A protruding portion 175Ab is disposed at an end of the side surface portion 171Ab in the forward direction D2a and at an end in the upward direction D3a via an elastic portion 1755Ab extending in the left direction D1a. The protruding portion 175Ab functions as an elastic body by being cantilevered by the side surface portion 171Ab. The protruding portion 175Ab protrudes in the upward direction D3a relative to the elastic portion 1755Ab. The protruding portion 175Ab includes a portion on its surface on the rearward direction D2b side (the surface on the inner side of the substrate holder 170A) that is approximately perpendicular to the bottom surface portion 179A. When a force F is applied to the protruding portion 175Ab in the downward direction D3b, the elastic portion 1755Ab undergoes elastic deformation, causing the protruding portion 175Ab to move in the downward direction D3b.

[0059] An opening 170Aa is formed in the forward direction D2a of the substrate holder 170A. As the raised portions 175Aa and 175Ab move downward in the downward direction D3b, the opening 170Aa is large enough to insert the passive circuit board 750 into the substrate holder 170A. As the passive circuit board 750 is inserted into the substrate holder 170A through the opening 170Aa, the passive circuit board 750 comes into contact with the side portion 178A. In this state, the raised portions 175Aa and 175Ab return to their original positions. During this process, the capacitor 756 disposed on the passive circuit board 750 passes between the raised portions 175Aa and 175Ab. Note that the raised portions 175Aa and 175Ab may not return completely to their original positions because they are in contact with the end face or edge of the passive circuit board 750. That is, the elastic portions 1755Aa, 1755Ab may continue to be subjected to a force F in the upward direction D3a by the passive circuit board 750, but the positions of the raised portions 175Aa, 175Ab will return to the position at least to the extent that the passive circuit board 750 cannot pass through the opening 170Aa.

[0060] When the passive circuit board 750 is accommodated in the board holder 170A, its position in the left-right direction D1 is determined by the side surface portions 171Aa and 171Ab, its position in the front-rear direction D2 is determined by the side surface portion 178A and the raised portions 175Aa and 175Ab, and its position in the up-down direction D3 is determined by the bottom surface portion 179A and the lid portions 172Aa and 172Ab. In this manner, the passive circuit board 750 is held by the board holder 170A. Note that, as in the first embodiment, configurations corresponding to the elastic portion 1775a and the raised portion 177a may be provided in the board holder 170A. Furthermore, by providing protrusions on the surfaces of the lid portions 172Aa and 172Ab facing upward in the direction D3a, a force in the upward direction D3a may be applied to the passive circuit board 750 from the protrusions. In this case, this configuration can be realized if the cover portions 172Aa and 172Ab are elastically deformed in the downward direction D3b when the passive circuit board 750 is held.

[0061] With the protruding portions 175Aa and 175Ab moved downward in the direction D3b, the passive circuit board 750 can be slid toward the opening 170Aa to remove the passive circuit board 750 from the board holder 170A. In this way, the board holder 170A removably holds the passive circuit board 750.

[0062] In this way, the substrate holder 170A is formed integrally with the key 10, and particularly when the key 10 and the substrate holder 170A are formed integrally by injection molding, the fixing member 190 in the first embodiment does not need to be present, although some shape restrictions are imposed due to manufacturing constraints.

[0063] <Third embodiment> In the third embodiment, a board holder 170B that detachably holds a passive circuit board 750 by opening and closing a lid will be described with reference to FIGS.

[0064] FIG. 14 is a diagram illustrating a board holder from which a passive circuit board has been removed in the third embodiment of the present invention. FIG. 15 is a diagram illustrating a state in which a passive circuit board has been placed on the board holder in the third embodiment of the present invention. FIG. 16 is a cross section (cutting line Cc1-Cc2) in a state in which a passive circuit board has been placed on the board holder in the third embodiment of the present invention. 17 is a diagram illustrating a cross section of the passive circuit board attached to the board holder by closing the lid portion 172B in FIG. 16. In this example, the board holder 170B is made of resin and manufactured by injection molding. The board holder 170B has a substantially rectangular parallelepiped shape with a partially open side, and one side has an openable lid structure.

[0065] A plate-shaped bottom surface portion 179B is disposed on the upward direction D3a (key 10 side) of the substrate holder 170B. A bottom surface portion 179Ba is disposed on the front direction D2a of the bottom surface portion 179B, and a bottom surface portion 179Bb is disposed on the rear direction D2b. The bottom surface portion 179Ba includes a through-hole 1795Ba, and the bottom surface portion 179Bb includes a through-hole 1795Bb. These through-holes 1795Ba and 1795Bb may be used to accommodate fixing members for fixing the substrate holder 170B to the key 10, and may have the same function as the through-holes 1795a and 1795b in the first embodiment, for example.

[0066] A side surface portion 171Ba is disposed at an end of the bottom surface portion 179B in the left direction D1a. A side surface portion 171Bb is disposed at an end of the bottom surface portion 179B in the right direction D1b. A side surface portion 174B is disposed at an end of the bottom surface portion 179B in the front direction D2a. A side surface portion 178B is disposed at an end of the bottom surface portion 179B in the rear direction D2b. The side surfaces 171Ba, 171Bb, 174B, and 178B are plate-like members including a portion that is approximately perpendicular to the bottom surface portion 179. A protruding portion 175Ba is disposed on the side surface portion 174B. The protruding portion 175Ba protrudes in the front direction D2a relative to the side surface portion 174B. A plate-like lid portion 172B is disposed via a hinge portion 1725B at an end of the side surface portion 178B in the downward direction D3b. A notch 172Ba is formed in the approximate center of the lid portion 172B. An engagement portion 175Bb is disposed at the end of the lid portion 172B opposite to the hinge portion 1725B.

[0067] The lid portion 172B can rotate relative to the bottom portion 179B around the hinge portion 1725B as a central axis. That is, the positional relationship between the lid portion 172B and the bottom portion 179B is changeable. With the lid portion 172B open, the passive circuit board 750 is placed on the bottom portion 179B, and the lid portion 172B is moved in the closing direction C. At this time, a force F is applied to the engaging portion 175Bb in a direction moving it away from the lid portion 172B, causing the engaging portion 175Bb to pass through the protruding portion 175Ba and move upward D3a of the protruding portion 175Ba. This closes the lid portion 172B, and the passive circuit board 750 is sandwiched between the two plate-like members, i.e., between the lid portion 172B and the bottom portion 179B (first state). In this state, the passive circuit board 750 is held by the board holder 170B. At this time, the capacitor 756 on the passive circuit board 750 is prevented from coming into contact with the lid portion 172B by the cutout portion 172Ba.

[0068] When the passive circuit board 750 is placed in the board holder 170B, its position in the left-right direction D1 is determined by the side surface portions 171Ba and 171Bb, its position in the front-rear direction D2 is determined by the side surface portions 178B and 174B, and its position in the up-down direction D3 is determined by the bottom surface portion 179B and the lid portion 172B. In this manner, the passive circuit board 750 is held by the board holder 170B. As in the first embodiment, a configuration corresponding to the elastic portion 1775a and the raised portion 177a may be provided on the board holder 170B. An elastic body or nonwoven fabric may be sandwiched between the lid portion 172B and the passive circuit board 750, so that the lid portion 172B applies a force in the upward direction D3a to the passive circuit board 750, thereby allowing the board holder 170B to more firmly hold the passive circuit board 750.

[0069] When the cover 172B is opened with the engaging portion 175Bb receiving the force F and the cover 172B and the bottom portion 179B are separated (second state), the passive circuit board 750 is released from the holding state. In this manner, the board holder 170B holds the passive circuit board 750 in a detachable manner.

[0070] <Fourth embodiment> In the fourth embodiment, a board holder 170C that detachably holds a passive circuit board 750 by snap-fitting will be described with reference to FIGS.

[0071] Fig. 18 is a diagram illustrating a substrate holder from which a passive circuit board has been removed in a fourth embodiment of the present invention. Fig. 19 is a diagram illustrating a cross section (cutting line Dc1-Dc2) of a substrate holder in a fourth embodiment of the present invention. Fig. 20 is a diagram illustrating a passive circuit board in a fourth embodiment of the present invention. Fig. 21 is a diagram illustrating a substrate holder to which a passive circuit board in a fourth embodiment of the present invention has been attached. In this example, the substrate holder 170C is made of resin and manufactured by injection molding.

[0072] A plate-shaped bottom surface portion 179C is disposed on the upward direction D3a (key 10 side) of the substrate holder 170C. A bottom surface portion 179Ca is disposed on the front direction D2a of the bottom surface portion 179C, and a bottom surface portion 179Cb is disposed on the rear direction D2b. The bottom surface portion 179Ca includes a through-hole 1795Ca, and the bottom surface portion 179Cb includes a through-hole 1795Cb. These through-holes 1795Ca and 1795Cb may be used to place fixing members for fixing the substrate holder 170C to the key 10, and may have the same function as the through-holes 1795a and 1795b in the first embodiment, for example. A protruding portion 177C is disposed in the approximate center of the bottom surface portion 179C via an elastic portion 1775C. The elastic portion 1775C functions as an elastic body by being cantilevered by the bottom surface portion 179C. The raised portion 177C is raised in the downward direction D3b relative to the bottom surface portion 179C. The bottom surface portion 179C has thinned grooves 179Cc and 179Cd arranged at the end in the rear direction D3b.

[0073] At the end of the bottom surface portion 179C in the forward direction D2a, a side surface portion 174Ca, an elastic portion 1755C, and a side surface portion 174Cb extending downward in the downward direction D3b are arranged in this order along the left-right direction D1. The side surface portions 174Ca, 174Cb, and the elastic portion 1755C are plate-like members including portions that are approximately perpendicular to the bottom surface portion 179C. A protruding portion 175C is arranged at the end of the elastic portion 1755C in the downward direction D3b. The elastic portion 1755C is cantilevered by the bottom surface portion 179C and functions as an elastic body. The protruding portion 175C protrudes in the rear direction D2b relative to the elastic portion 1755C. The protruding portion 175C includes a portion that is approximately parallel to the bottom surface portion 179 on the surface on the upward direction D1a side.

[0074] A side surface portion 178C extending in the downward direction D3b is disposed at an end of the bottom surface portion 179C in the rear direction D2b. A guide portion 178Ca protruding in the forward direction D2a is disposed on the side surface portion 178C. The guide portion 178Ca is a plate-like member extending in the up-down direction D3 and the front-rear direction D2. A lid portion 173C extending in the forward direction D2a is disposed at an end of the side surface portion 178C in the downward direction D3b. The lid portion 173C is a plate-like member substantially parallel to the bottom surface portion 179C.

[0075] As shown in FIG. 20, a cutout portion 7508C is formed in the passive circuit board 750C. The cutout portion 7508C and the guide portion 178Ca have corresponding shapes. When the passive circuit board 750C is attached to the board holder 170C, first, as shown in FIG. 19, the passive circuit board 750C is placed on the board holder 170C so that the guide portion 178Ca is inserted into the cutout portion 7508C. Thereafter, when a force F is applied to the protruding portion 175C in the forward direction D2a, the elastic portion 1755C is elastically deformed, and the protruding portion 175C moves in the forward direction D2a. Then, by pressing the passive circuit board 750C toward the bottom surface portion 179C with a force Fc, the passive circuit board 750C is attached to the board holder 170C. Fits into 170C.

[0076] The position of the passive circuit board 750C in the left-right direction D1 is determined by the engagement between the guide portion 178Ca and the cutout portion 7508C of the board holder 170C (particularly, the contact between the guide portion 178Ca and the cutout portion 7508C in the left-right direction D1), and the position of the passive circuit board 750C in the front-rear direction D2 is determined by the guide portion 178Ca (or the side surface portion 178C) and the side surface portions 174Ca and 174Cb. The protruding portions 177C, which are moved upward in the direction D3a by the passive circuit board 750C, attempt to return to their original positions due to the restoring forces of the elastic portions 1775C. As a result, the protruding portions 177C apply a force to the passive circuit board 750C in the downward direction D3b, and the passive circuit board 750C is pressed against the lid portion 173C and the protruding portions 177C. This determines the position of the passive circuit board 750C in the up-down direction D3. In this manner, the passive circuit board 750C is held by the board holder 170C.

[0077] On the other hand, in a state in which the passive circuit board 750C is held by the board holder 170C, the passive circuit board 750C is released from being held by the board holder 170C by applying a force F to elastically deform the elastic portion 1755C and move the protruding portion 175C in the forward direction D2a. In this way, in a state in which the elastic portion 1755C is more elastically deformed than when the passive circuit board 750C was held by the board holder 170C, the passive circuit board 750C is released from being held.

[0078] Fifth Embodiment In the fifth embodiment, a passive circuit board 750D having two cutout portions 7505D and 7508D formed therein and a board holder 170D that holds the passive circuit board 750D will be described with reference to FIGS.

[0079] 22 is a diagram illustrating a passive circuit board according to the fifth embodiment of the present invention. A cutout portion 7508D in a passive circuit board 750D is the same as the cutout portion 7508C in the fourth embodiment. A cutout portion 7505D is formed at a position opposite to the cutout portion 7508D.

[0080] Fig. 23 is a diagram illustrating a cross section (corresponding to Fig. 19) of a substrate holder according to a fifth embodiment of the present invention. Substrate holder 170D has substantially the same configuration as substrate holder 170C, but does not have the side surface portions 174Ca and 174Cb of substrate holder 170C. Furthermore, a guide portion 1758D protruding from elastic portion 1755C is disposed on the bottom surface portion 179C side of protruding portion 175C. The same components are denoted by the same reference numerals as in substrate holder 170C according to the fourth embodiment. Guide portion 1758D has a shape corresponding to cutout portion 7505D, and when passive circuit board 750D is held by substrate holder 170D, guide portion 1758D fits into cutout portion 7505D.

[0081] In this example, when the passive circuit board 750D is held by the board holder 170D, the position of the passive circuit board 750D in the left-right direction D1 is determined by the engagement between the guide portion 178Ca and the notch portion 7508D (particularly, the contact between the guide portion 178Ca and the notch portion 7508D in the left-right direction D1) and the engagement between the guide portion 1758D and the notch portion 7505D (particularly, the contact between the guide portion 1758D and the notch portion 7505D in the left-right direction D1), and the position of the passive circuit board 750D in the front-rear direction D2 is determined by the guide portion 178Ca (or the side surface portion 178C) and the guide portion 1758D (or the elastic portion 1755C). The position of the passive circuit board 750D in the up-down direction D3 is determined in the same manner as in the fourth embodiment. In this manner, the passive circuit board 750D is held by the board holder 170D.

[0082] On the other hand, in a state in which the passive circuit board 750D is held by the board holder 170D, the holding of the passive circuit board 750D by the board holder 170D is released by applying a force F to elastically deform the elastic portion 1755D and move the protruding portion 175D in the forward direction D2a. In this way, in a state in which the elastic portion 1755D is more elastically deformed than when the passive circuit board 750D was held by the board holder 170D, the holding of the passive circuit board 750D by the board holder 170D is released.

[0083] Sixth Embodiment In the sixth embodiment, a keyboard device 1E including a substrate holder 170E that is fixed not to the key 10 but to a member that interlocks with the key 10 will be described with reference to Figures 24 to 26. Here, the key connection section 301 of the load section 30 is exemplified as the member that interlocks with the key 10.

[0084] FIG. 24 is a diagram illustrating the internal structure (when a key is released) of a keyboard device according to a sixth embodiment of the present invention. FIG. 25 is a diagram illustrating the internal structure (when a white key is pressed) of a keyboard device according to a sixth embodiment of the present invention. In the keyboard device 1E, the board holder 170E is fixed to the underside of the key connection portion 301. Therefore, the board holding portion 207E on which the active circuit board 700 is disposed is disposed below the key connection portion 301. When the key 10 is pressed in the state shown in FIG. 24, as shown in FIG. 25, the load portion 30 rotates in conjunction with the rotation of the key 10, causing the weight portion 305 to move upward and collide with the upper stopper 353, restricting further movement. At this time, as shown in FIG. 25, the key connection portion 301 moves downward, bringing the active circuit board 700 and the passive circuit board 750D closer to each other. Here, the substrate holder 170E is positioned close to the center of rotation so that the amount of movement during rotation is small, but depending on the application, the substrate holder 170E may be positioned away from the center of rotation.

[0085] The difference in angle between the passive circuit board 750D and the active circuit board 700 when the key is released and when it is pressed is greater than in the first embodiment in which the passive circuit board 750D is attached to the key 10. Even if the change in angle is large, the amount of magnetic flux passing through the passive coil 751 changes, so there is no problem even if the positional relationship between the passive coil 751 and the active coil 701 is as in the sixth embodiment.

[0086] FIG. 26 is a diagram illustrating a board holder to which a passive circuit board according to the sixth embodiment of the present invention is attached. In this example, the board holder 170E has a configuration equivalent to that of the board holder 170D according to the fifth embodiment. Furthermore, the board holder 170E and the key connection portion 301 are integrally formed by injection molding and are made of the same material. Because the board holder 170E and the board holder 170D have similar configurations, the passive circuit board 750D shown in the fifth embodiment is attached to the board holder 170E. The bottom surface portion 179E, side surface portion 178E, lid portion 173E, guide portion 178Ea, elastic portion 1755E, and raised portion 175E of the board holder 170E correspond to the bottom surface portion 179C, side surface portion 178C, lid portion 173C, guide portion 178Ca, elastic portion 1755C, and raised portion 175D of the board holder 170D, respectively.

[0087] Seventh Embodiment In the seventh embodiment, a keyboard device 1F including a board holder 170F attached to a part other than the key 10 and the load section 30 will be described with reference to FIGS. 27 to 31. FIG.

[0088] Fig. 27 is a diagram illustrating the internal structure of a keyboard device according to a seventh embodiment of the present invention (when a key is released). Fig. 28 is a diagram illustrating the internal structure of a keyboard device according to a seventh embodiment of the present invention (when a white key is pressed). In the keyboard device 1F, the board holder 170F is disposed in the board holding section 207E below the key connection section 301 so as to cover the active circuit board 700. The board holder 170F is a dome-shaped structure made of an elastic material such as rubber, A part of the key holder 170F has a mechanism for holding the passive circuit board 750F. When the key 10 is pressed in the state shown in Figure 27, the load unit 30 rotates in conjunction with the rotation of the key 10, causing the weight unit 305 to move upward and collide with the upper stopper 353, restricting further movement, as shown in Figure 28. At this time, the key connecting unit 301 comes into contact with the board holder 170F as it moves downward.

[0089] The key connection portion 301 further moves downward, thereby deforming the board holder 170F. Deforming the board holder 170F brings the passive circuit board 750F held by the board holder 170F closer to the active circuit board 700. When the key 10 returns to its original position, as shown in FIG. 27 , the board holder 170F returns to its original shape due to its own restoring force, and the passive circuit board 750F moves away from the active circuit board 700. In this way, the shape of the board holder 170F changes in part of the key depression range in response to the movement of the key 10. Therefore, the board holder 170F can also be said to be a component that moves in conjunction with the key 10. Next, the board holder 170F will be described.

[0090] FIG. 29 is a diagram illustrating a substrate holder to which a passive circuit board according to a seventh embodiment of the present invention is attached. FIG. 30 is a diagram illustrating the inside of a substrate holder to which a passive circuit board according to a seventh embodiment of the present invention is attached (a diagram of the substrate holder viewed from below). FIG. 31 is a diagram illustrating a cross section (cutting line Ec1-Ec2) of the substrate holder according to the seventh embodiment of the present invention. The substrate holder 170F includes a base portion 170Fz and a portion forming a dome shape that expands in the upward direction D3a from the base portion 170Fz. The portion forming the dome shape includes a lower side surface portion 170Fy, an upper side surface portion 170Fx, and a top surface portion 170Ft. Lid portions 172Fa and 172Fb that protrude toward the inner surface are arranged on the upper side surface portion 170Fx.

[0091] The base portion 170Fz has protrusions 1705Fz that protrude downward in the downward direction D3b, which are arranged corresponding to the four corners of the base portion 170Fz. The protrusions 1705Fz are fitted into holes TH provided in the active circuit board 700. This determines the position of the board holder 170F (passive circuit board 750F) relative to the active circuit board 700.

[0092] The passive circuit board 750F has an outer periphery that conforms to the shape of the upper side surface portion 170Fx. Unlike the passive circuit board 750 in the above-described embodiment, the corners of the rectangular shape are formed in an arc-like shape. The passive circuit board 750F is held by the board holder 170F by being sandwiched between the top surface portion 170Ft and the lid portions 172Fa and 172Fb. Because the passive circuit board 750F is a rigid structure, the shape of the board holder 170F is maintained by the influence of the passive circuit board 750F on the top surface portion 170Ft side relative to the lid portions 172Fa and 172Fb, even though the board holder 170F is an elastic body, and it hardly deforms. Therefore, when the key connection portion 301 deforms the board holder 170F, the lower side surface portion 170Fy is mainly deformed, and the top surface portion 170Ft approaches the active circuit board 700.

[0093] When attaching or detaching the passive circuit board 750F to or from the board holder 170F, a force F is applied to spread the lid portions 172Fa and 172Fb outward, thereby deforming the board holder 170F and expanding the opening 170Fa to an extent that the passive circuit board 750F can pass through. In other words, the passive circuit board 750F can be attached to or detached from the board holder 170F by passing through the gap between the lid portions 172Fa and 172Fb.

[0094] The substrate holder 170F is provided corresponding to each key 10. The base portions 170Fz of adjacent substrate holders 170F may be connected to each other.

[0095] Eighth Embodiment In the eighth embodiment, a substrate holder 170G formed by injection molding a substrate holder 170F like that of the seventh embodiment, with a passive circuit board 750F also placed in the injection molding die, will be described with reference to Figures 32 and 33.

[0096] FIG. 32 is a diagram illustrating the inside of a substrate holder to which a passive circuit board is attached according to the eighth embodiment of the present invention. FIG. 33 is a diagram illustrating a cross section (cutting line Fc1-Fc2) of the substrate holder according to the eighth embodiment of the present invention. The substrate holder 170G is an elastic body formed by injection molding, similar to the substrate holder 170F. In this example, the passive circuit board 750F is incorporated into the elastic body during injection molding, so the substrate holder 170G does not allow the passive circuit board 750F to be attached or detached. The top surface 170Gt, upper side surface 170Gx, lower side surface 170Gy, base 170Gz, and protrusion 1705Gz of the substrate holder 170G correspond to the top surface 170Ft, upper side surface 170Fx, lower side surface 170Fy, base 170Fz, and protrusion 1705Fz of the substrate holder 170F, respectively.

[0097] On the other hand, the substrate holder 170G has a lid portion 172G arranged on the inner side of the upper side surface portion 170Gx, and the lid portion 172Fa of the substrate holder 170F has a different configuration. The lid portion 172G has a through-hole 172Gp. Although the through-hole 172Gp does not necessarily have to be formed, in this example, it is formed so as to expose the capacitor 756 of the passive circuit board 750F. Depending on the injection molding conditions, the resin may apply stress to the capacitor 756 due to expansion and contraction of the material. By forming the through-hole 172Gp in the lid portion 172G, exposing the capacitor 756, as in this example, the effects of such stress can be avoided. On the other hand, it is desirable for such a through-hole 172Gp to be as small as possible in order to hold the passive circuit board 750F. During injection molding, it is desirable to support the passive circuit board 750F from the outside with multiple pins or the like to prevent the position of the passive circuit board 750F from changing. In this case, for example, through holes of shapes corresponding to the portions where the pins are arranged remain in the top surface portion 170Ft and the upper side surface portion 170Fx. However, it is desirable that all of the through holes, including the above-mentioned through hole 172Gp, are large enough that the passive circuit board 750F cannot pass through.

[0098] In this way, by forming the substrate holder 170G and the passive circuit board 750F as a single unit, the substrate holder 170G cannot be configured to allow the passive circuit board 750F to be attached or detached, but this is effective in cases where it is efficient to replace the entire substrate holder 170G.

[0099] Ninth Embodiment In the ninth embodiment, a substrate holder 170H obtained by applying the substrate holder 170G in the eighth embodiment instead of the substrate holder 170E in the sixth embodiment will be described with reference to FIG.

[0100] FIG. 34 is a diagram illustrating a board holder to which a passive circuit board according to the ninth embodiment of the present invention is attached. In this example, the board holder 170H is disposed on the underside of the key connection portion 301. The board holder 170H and the key connection portion 301 are integrally formed by injection molding. At this time, the passive circuit board 750 is also placed in a mold and formed together with the board holder 170H. As with the board holder 170G of the eighth embodiment, a through-hole 1705Ha is formed in the underside 170Ha of the board holder 170H. The capacitor 756 of the passive circuit board 750 is exposed from the board holder 170H through the through-hole 1705Ha. Furthermore, through-holes 1705Hb and 1705Hc are formed in the side surfaces 170Hb and 170Hc. The through-holes 1705Hb and 1705Hc were formed because pins supporting the passive circuit board 750 were placed therein during injection molding.

[0101] Tenth Embodiment The magnetic induction sensor can also be used in an acoustic piano. In the tenth embodiment, a grand piano 1J using a substrate holder 170 will be described with reference to FIGS.

[0102] FIG. 35 is a diagram illustrating the internal structure (when a key is released) of a keyboard device according to a tenth embodiment of the present invention. FIG. 36 is a diagram illustrating the mounting position of a board holder according to the tenth embodiment of the present invention. In this example, the board holder 170 is attached to a hammer shank 305J of a grand piano 1J by a fixing member 190J. The fixing member 190J has a shape that surrounds the axis of the hammer shank 305J. When the outer edge of the cross section (cross section perpendicular to the longitudinal direction) of the hammer shank 305J is not circular, as in the case of the hammer shank 305J shown in FIG. 36, rotation around the axis can be prevented by using a fixing member 190J with an inner shape that matches the shape of the outer edge. The fixing member 190J may be glued to the hammer shank 305J. Note that the fixing member 190 described in the first embodiment may be inserted into the hammer shank 305J to fix the board holder 170 to the hammer shank 305J.

[0103] The active circuit board 700 is disposed on a board holding portion 207J fixed to the frame 20J. In this example, the active circuit board 700 is disposed on the underside of the board holding portion 207J, but if the board holding portion 207J is a resin structure, it may be disposed on the upper side of the board holding portion 207J. Furthermore, the board holder 170 may be attached to a different position on the hammer shank 305J.

[0104] Figure 37 is a diagram illustrating another example of the mounting position of the substrate holder in the tenth embodiment of the present invention. In the example shown in Figure 37, the substrate holder 170 is mounted on the surface of the hammer shank 305J opposite to the portion where the hammer roller 309J is mounted. This surface is a portion of the hammer shank 305J that has a relatively large flat surface. This makes it easy to position the substrate holder 170.

[0105] The board holder 170 may be attached to the jack 307J instead of the hammer shank 305J, or may be attached to the key 10J. When the board holder 170 is attached to the jack 307J, the active circuit board 700 may be placed on the frame 20J. In this case, the active circuit board 700 may be placed upright with the normal to its surface facing the jack 307J. Furthermore, when the board holder 170 is attached to the key 10J, the active circuit board 700 may be placed on the shelf 50J.

[0106] Eleventh Embodiment In the eleventh embodiment, an upright piano 1K using a board holder 170 will be described with reference to FIGS.

[0107] FIG. 38 is a diagram illustrating the internal structure (when a key is released) of a keyboard device according to an eleventh embodiment of the present invention. FIG. 39 is a diagram illustrating the mounting position of a board holder according to the eleventh embodiment of the present invention. In this example, the board holder 170 is attached to a hammer shank 305K of an upright piano 1K by a fixing member 190K. The fixing member 190K is shaped to surround the axis of the hammer shank 305K. The hammer shank 305K is cylindrical. Therefore, to prevent the board holder 170 from rotating around the hammer shank 305K as its central axis, a portion of the butt 311K supporting the hammer shank 305K is brought into contact with the board holder 170 in an area CA. The fixing member 190J may be glued to the hammer shank 305J. The fixing member 190 described in the first embodiment may be inserted into and fixed to the butt 311K in the area CA.

[0108] The active circuit board 700 is disposed on a board holding portion 207K fixed to a frame (not shown). The board holder 170 may also be attached to the hammer shank 305K in a different manner.

[0109] 40 is a diagram illustrating an example in which the substrate holder according to the eleventh embodiment of the present invention is attached in a different manner. In this example, the fixing member 190 described in the first embodiment is inserted into the hammer shank 305K to fix the substrate holder 170 to the hammer shank 305K. At this time, an auxiliary member 195M may be disposed to fill the gap between the substrate holder 170 and the hammer shank 305K.

[0110] <Twelfth embodiment> In the twelfth embodiment, a board holder 170N that holds a passive circuit board 750N using a different configuration from the board holder 170E formed integrally with the key connection portion 301 as in the sixth embodiment will be described with reference to Figures 41 and 42.

[0111] Fig. 41 is a diagram illustrating a board holder to which a passive circuit board is attached according to the twelfth embodiment of the present invention. Fig. 42 is a diagram illustrating a cross section (cutting line Gc1-Gc2) of the board holder according to the twelfth embodiment of the present invention. Fig. 41 is a diagram illustrating the board holder 170N as viewed from below. The board holder 170N is disposed below the key connection part 301.

[0112] The bottom surface 179N, side surface 178N, lid portion 173N, and guide portion 178Na of the substrate holder 170N correspond to the bottom surface 179E, side surface 178E, lid portion 173E, and guide portion 178Ea of the substrate holder 170E shown in Fig. 26. The cutout portion 7508N in the passive circuit board 750N attached to the substrate holder 170N corresponds to the cutout portion 7508D in the passive circuit board 750D shown in Fig. 22.

[0113] On the other hand, instead of the elastic portion 1755E and the raised portion 175E of the substrate holder 170E, the substrate holder 170N has a male screw 175N and a female screw 1795N. The female screw 1795N is formed on the bottom surface portion 179N. Instead of the notch portion 7505D of the passive circuit board 750D, the passive circuit board 750N has an opening 7505N. When the male screw 175N is fastened to the female screw 1795N, the male screw 175N passes through the opening 7505N, and the head of the male screw 175N comes into contact with the surface 750Na of the passive circuit board 750N.

[0114] In this state, the passive circuit board 750N is sandwiched between the head of the male screw 175N and the bottom surface portion 179N, so that its position in the up-down direction D3 is determined, its position in the front-rear direction D2 is determined by the side surface portion 178E and the shaft portion of the male screw 175N, and its position in the left-right direction D1 is determined by the engagement between the guide portion 178Na and the notch portion 7508N (particularly, the contact between the guide portion 178Na and the notch portion 7508N in the left-right direction D1). When the male screw 175N is removed from the female screw 1795N, the passive circuit board 750N is released from the board holder 170N.

[0115] <Thirteenth embodiment> In the twelfth embodiment, a board holder 170P that holds a passive circuit board 750P by a different configuration from the board holder 170N in the twelfth embodiment will be described with reference to FIGS.

[0116] Fig. 43 is a diagram illustrating a substrate holder to which a passive circuit board is attached in the thirteenth embodiment of the present invention. Fig. 44 is a cross-sectional view of the substrate holder in the thirteenth embodiment of the present invention. 1 is a diagram illustrating the cutting line Hc1-Hc2. The substrate holder 170P is disposed below the key connecting portion 301. FIG.

[0117] The male screws 175Pb and female screws 1795Pb of the substrate holder 170P correspond to the male screws 175N and female screws 1795N of the substrate holder 170N, respectively. The opening 7505Pb in the passive circuit board 750P attached to the substrate holder 170P corresponds to the opening 7505N in the passive circuit board 750N.

[0118] The substrate holder 170P has male screws 175Pa and female screws 1795Pa, instead of the side surface portion 178N, lid portion 173N, and guide portion 178Na of the substrate holder 170N. The passive circuit board 750P has an opening 7505Pa, instead of the cutout portion 7508N of the passive circuit board 750N. In this example, the substrate holder 170P has protrusions 1755Pa and 1755Pb that protrude downward from the bottom surface portion 179P. The passive circuit board 750P has openings 7555Pa and 7555Pb into which the protrusions 1755Pa and 1755Pb are inserted.

[0119] In this example, the opening 7505Pa is configured so that a portion of the opening 7505Pa reaches the edge of the passive circuit board 750P and is not surrounded by the passive circuit board 750P, but the opening 7505Pa may be formed in a position where it is completely surrounded. If the opening 7505Pa is not surrounded by the passive circuit board 750P, it is preferable that the size of the unsurrounded portion is smaller than the diameter of the shaft of the male screw 175Pa, that is, that the shaft of the male screw 175Pa cannot pass from the inside to the outside of the opening 7505Pa.

[0120] When the male screw 175Pa is fastened to the female screw 1795Pa and the male screw 175Pb is fastened to the female screw 1795Pb, the male screws 175Pa and 175Pb pass through the openings 7505Pa and 7505Pb, respectively, and the heads of the male screws 175Pa and 175Pb come into contact with the surface 750Pb of the passive circuit board 750P. The protrusions 1755Pa and 1755Pb pass through the openings 7555Pa and 7555Pb, respectively. The protrusions 1755Pa do not have to pass through the openings 7555Pa as long as they enter the interior of the openings 7555Pa. The same applies to the protrusions 1755Pb.

[0121] In this state, the position of the passive circuit board 750P in the up-down direction D3 is determined by being sandwiched between the heads of the male screws 175Pa and 175Pb and the bottom surface portion 179P, and the position of the passive circuit board 750P in the left-right direction D1 and the front-back direction D2 is determined by the protrusions 1755Pa and 1755Pb. If the protrusions 1755Pa and 1755Pb are not present, the position of the passive circuit board 750P in the left-right direction D1 and the front-back direction D2 may be determined by the shafts of the male screws 175Pa and 175Pb. The position of the passive circuit board 750P in the left-right direction D1 and the front-back direction D2 may be determined by two of the protrusions 1755Pa and 1755Pb and the male screws 175Pa and 175Pb. To determine the position in the up-down direction D3, it is sufficient that at least one of the male screws 175Pa and 175Pb is present.

[0122] The male screw 175Pa is removed from the female screw 1795Pa, and the male screw 175Pb is removed from the female screw 1795Pb, whereby the passive circuit board 750P is released from the board holder 170P.

[0123] In this example, a recess 1756P is further formed in the bottom surface portion 179P. The recess 1756P is formed at a position corresponding to the capacitor 756P of the passive circuit board 750P. Therefore, even if the passive circuit board 750P is arranged so that the capacitor 756P faces the bottom surface portion 179P, the capacitor 756P can be contained within the area of ​​the recess 1756P. This prevents physical interference with the capacitor 756P from other structures. This can be prevented.

[0124] <Modification> Although one embodiment of the present invention has been described above, this embodiment can be modified in various ways as described below. The above-described embodiment and the modifications described below can also be applied in combination with each other. Furthermore, it is possible to add, delete, or replace part of the configuration of each embodiment with another configuration. In the following description, unless otherwise specified, the first embodiment will be described as a modified example, but it can also be applied as a modified example of other embodiments.

[0125] (1) Although passive coil 751 is provided on passive circuit board 750, a metal plate may be provided instead of passive coil 751. Even with this configuration, the output signal of active circuit 770 can be modulated by eddy currents generated in the metal plate, similar to passive coil 751. That is, in passive circuit board 750, a conductor capable of absorbing energy via a magnetic field, such as a metal plate, may be disposed instead of a coil.

[0126] (2) In the first embodiment, the active coil 701 was arranged on the frame 20 side, and the passive coil 751 was held by the substrate holder 170 and arranged on the key 10 side. Since the passive coil 751 does not require a power supply, it is easy to design it so that it is arranged on the side of the structure having a moving part, but the reverse arrangement is also possible. That is, the active coil 701 may be arranged on the key 10 side, and the passive coil 751 may be arranged on the frame 20 side. In this case, a configuration for supplying power, etc. may be arranged in the substrate holder 170.

[0127] (3) The distance between the active coil 701 and the passive coil 751 is closer when the key is pressed than when it is released, but it may be closer when the key is released. This configuration may be achieved via a member that moves with the key 10, or the active circuit board 700 may be placed on the top side of the key 10.

[0128] (4) While one pair of an active circuit 770 and a passive circuit board 750 is provided for each key 10 in the above embodiment, multiple pairs may be provided for each key 10. For example, the movement amounts of multiple components may be measured by using a sensor that measures the amount of depression of the key 10 as in the first embodiment and a sensor that measures the movement amount of a component linked to the key 10 as in the sixth embodiment. Alternatively, multiple sensors may be provided on the key 10. In this case, each sensor may have a different measurable range of depression amount. Information regarding the sound generation timing and key depression speed may be generated based on a sensor provided in the load section 30, and information regarding the sound suppression timing may be generated based on a sensor provided in the key 10.

[0129] (5) The coil shape of the active coil 701 may take various forms other than those described above. The active coil 701 may also be realized using a plurality of coils. The same applies to the passive coil 751. Various forms can be adopted for the active coil 701 and the passive coil 751 as long as they are configured to form a magnetic field in the active coil 701 and cause anti-resonance in the active circuit 770 via the magnetic field in the passive coil 751.

[0130] (6) The active circuit board 700 was arranged on the frame 20 (board holding portion 207) that is not linked to the key 10. However, if the positional relationship between the active circuit board 700 and the passive circuit board 750 changes between when the key is released and when it is pressed, the active circuit board 700 may be arranged on a member that is linked to the key 10.

[0131] (7) The fixing member 190 that fixes the board holder 170 to the key 10 or a component linked to the key 10 may be a screw, a combination of bolts and nuts, double-sided tape, adhesive, a tacker, a nailer, or hot glue. The fixing member may be made of various materials and forms, but is preferably made of a material with a relative permeability close to 1 or an insulating material such as resin to minimize its effect on the magnetic field. If the key 10 is made of wood or a resilient material such as a specific resin, the board holder 170 and the key 10 may be fixed by press-fitting using a dowel or the like. Alternatively, the passive circuit board 750 may be directly fixed to the key 10 or a component linked to the key 10 with a fixing member, without using the board holder 170. Even in this case, the fixing member may be made of various materials and forms, but is preferably made of a material with a relative permeability close to 1 or an insulating material such as resin to minimize its effect on the magnetic field.

[0132] (8) The passive circuit board 750 and the active circuit board 700 are positioned so that their surfaces are substantially opposite each other. Operating the key 10 causes the coils on both surfaces to approach or move away from each other in the substantially vertical direction D3, thereby changing the distance between them. The key press amount measurement unit 70 functions as a distance sensor by outputting a signal corresponding to this distance. Even when both surfaces are positioned substantially perpendicular to the operating surface of the key 10, the key press amount measurement unit 70 can still function as a distance sensor. For example, consider a case in which both surfaces of the passive circuit board 750 and the active circuit board 700 are positioned so that their normals are aligned with the horizontal direction D1. In this case, when viewed along the horizontal direction D1, as the key 10 is pressed, the distance between the passive circuit board 750 and the active circuit board 700 changes, and the overlapping area of ​​the two surfaces also changes. This change in area also changes the output signal from the active circuit board 700, allowing the key press amount measurement unit 70 to function as a distance sensor.

[0133] (9) In the above-described embodiments, the electronic keyboard instrument is described as having a speaker 60 and a sound source unit 80, or as having a sound-producing mechanism such as strings like an acoustic piano such as a grand piano or an upright piano, but the electronic keyboard instrument may be configured without the speaker 60 and the sound source unit 80. In this case, the key depression amount measuring unit 70 is used to record the performance of the keyboard or to output a performance signal to the outside.

[0134] As can be understood from the above explanation, the present invention can also be specified as a device (musical performance operation device) that controls sound generation by outputting operation signals to a sound source unit 80 or a sound generation mechanism in response to musical performance actions. As exemplified in each of the above-described embodiments, the musical performance operation device includes musical instruments (keyboard device 1) that have a sound source unit 80 and output sound signals, and musical instruments that have a sound generation mechanism and generate sound. However, in addition to these musical instruments, the musical performance operation device may also include devices that do not output sound signals (e.g., MIDI controllers) and devices that do not generate sound themselves (e.g., pedal mechanisms). In this case, keys and pedals are specified as controls for musical performance operation. In this way, the musical performance operation device includes devices that control the generation of sound and change the generation mode of sound, or output sound signals, in response to the player (operator) operating the controls with their hands or feet.

[0135] When applied to a pedal mechanism, the structure is such that a board holder 170 is fixed to a pedal serving as an operator, and a passive circuit board 750 held by the board holder 170 faces an active circuit board 700 provided on a support part that supports the pedal so that the pedal can be operated. Operation of the pedal changes the distance (positional relationship) between the passive circuit board 750 and the active circuit board 700, thereby enabling the operation to be detected. [Explanation of symbols]

[0136] 1, 1E, 1F...keyboard device, 1J...grand piano, 1K...upright piano, 10, 10J...key, 10b...black key, 10w...white key, 20, 20J...frame, 30...load section, 5 0...housing, 50J...shelf, 60...speaker, 70...key press amount measurement unit, 80...sound source unit, 90...operation unit, 103...load connection unit, 105...elastic unit, 170, 170A, 170B, 170C, 170D, 170E, 170F, 170G, 170H, 170N, 170P...board holder, 170a, 170Aa, 170Fa, 7505N, 7505Pa, 7505Pb, 7555Pa, 7555Pb...opening, 170Ft, 170Gt...top surface, 170Fx, 170Gx...upper side surface, 170Fy, 1 70Gy...lower side part, 170Fz,170Gz...base part, 170Ha...bottom part, 170Hb,170Hc,171a,171Aa,171Ab,171b,171Ba,171Bb,174B,174Ca,174Cb,178,178A ,178B,178C,178E,178N...Side part, 172a,172Aa,172Ab,172b,172B,172Fa,172Fb,172G,173a,173b,173C,173E,173N...Lid part, 172Ba,7505D,7 508C, 7508D, 7508N...Notched portion, 172Gp, 1705Ha, 1705Hb, 1705Hc, 1795a, 1795b...Through hole, 175, 175Aa, 175Ab, 175Ba, 175C, 175E, 177a, 177b, 177C...Rising portion, 175Bb...Engagement portion, 175N, 175Pa, 175Pb...Male screw, 1755Pa, 1755Pb...Protrusion portion, 178Ca, 178Ea, 1758D, 178Na...Guide portion, 179, 179A, 179B, 179Ba, 179 Bb, 179C, 179Ca, 179Cb, 179E, 179N, 179P... bottom surface portion, 179Cc, 179Cd, 1795c... groove portion, 1795N, 1795Pa, 1795Pb... female screw, 190, 190J, 190K... fixing member, 190a, 190b... key embedding portion, 190c... plate-shaped member, 195M... auxiliary member, 201... key guide portion, 203... key support portion, 205... rib portion, 207, 207E, 207J, 207K... board holding portion, 301... key connection portion, 303... bearing, 305... weight portion, 305J,305K...Hammer shank, 307J...Jack, 309J...Hammer roller, 311K...Butt, 351...Lower stopper, 353...Upper stopper, 700...Active circuit board, 701...Active coil, 701a...Wiring, 701b...Wiring, 701x...First coil, 701y...Second coil, 703a...Signal input section, 703b...Signal output section, 706a, 706b...Capacitor, 707a, 707b...Resistor, 708...Ground wiring, 709...Multiplexer, 750, 750C, 750 D, 750F, 750N, 750P... Passive circuit board, 750a, 750b, 750Na... Surface, 751... Passive coil, 751x, 751y... Coil, 751xt1, 751xt2, 751yt1, 751yt2... Hole, 756... Capacitor, 770... Active circuit, 1725a, 1725b, 1735a, 1735b... Linear protrusion, 1725B... Hinge portion, 1755, 1755Aa, 1755Ab, 1755C, 1755E, 1775a, 1775b, 1775C... Elastic portion,

Claims

1. a magnetic induction sensor including a first substrate and a second substrate, each having a conductor disposed thereon, for measuring a distance between the first substrate and the second substrate; a key operable by an operator; a holding portion that holds the first substrate between the key and the second substrate; Equipped with At least one of the conductors disposed on the first substrate and the second substrate includes a coil; The holding portion is displaced in accordance with the displacement of the key, the holding portion contacts the opposing surface of the first substrate, the first substrate has a notch or an opening when viewed in a direction perpendicular to a surface of the first substrate on which the conductors are arranged, A keyboard device in which a part of the holding portion enters inside the notch or the opening.

2. A magnetic induction sensor including a first substrate and a second substrate, each having a conductor arranged thereon, for measuring a distance between the first substrate and the second substrate; a key operable by an operator; a holding portion that holds the first substrate between the key and the second substrate; Equipped with At least one of the conductors disposed on the first substrate and the second substrate includes a coil; The holding portion is displaced in accordance with the displacement of the key, the holding portion contacts the opposing surface of the first substrate, the holding portion holds the first substrate in a state where the first substrate and the holding portion are positioned by fitting, abutting, or sandwiching the first substrate and the holding portion, the first substrate has a notch or an opening when viewed in a direction perpendicular to a surface of the first substrate on which the conductors are arranged, A keyboard device in which a part of the holding portion enters inside the notch or the opening.

3. a magnetic induction sensor including a first substrate and a second substrate, each having a conductor disposed thereon, for measuring a distance between the first substrate and the second substrate; a key operable by an operator; a first member interlocked with the key; a holding portion that holds the first substrate between the first member and the second substrate; Equipped with At least one of the conductors disposed on the first substrate and the second substrate includes a coil; the holding portion is displaced in accordance with the displacement of the first member, the holding portion contacts the opposing surface of the first substrate, the first substrate has a notch or an opening when viewed in a direction perpendicular to a surface of the first substrate on which the conductors are arranged, A keyboard device in which a part of the holding portion enters inside the notch or the opening.

4. A magnetic induction sensor including a first substrate and a second substrate, each having a conductor arranged thereon, for measuring a distance between the first substrate and the second substrate; a key operable by an operator; a first member interlocked with the key; a holding portion that holds the first substrate between the first member and the second substrate; Equipped with At least one of the conductors disposed on the first substrate and the second substrate includes a coil; the holding portion is displaced in accordance with the displacement of the first member, the holding portion contacts the opposing surface of the first substrate, the holding portion holds the first substrate in a state where the first substrate and the holding portion are positioned by fitting, abutting, or sandwiching the first substrate and the holding portion, the first substrate has a notch or an opening when viewed in a direction perpendicular to a surface of the first substrate on which the conductors are arranged, A keyboard device, wherein a portion of the holding portion enters the inside of the cutout portion or the opening.

5. 3. The keyboard device according to claim 1, wherein the key and the holder are made of the same material.

6. 5. The keyboard device according to claim 3, wherein the first member and the holding portion are made of the same material.

7. The keyboard device according to claim 1 , wherein the holding portion detachably holds the first substrate.

8. the holding portion includes an elastic body, the holding portion holds the first substrate when the elastic body is in a first state; 8. The keyboard device according to claim 7, wherein the holding of the first substrate by the holding portion is released when the elastic body is in a second state in which it is elastically deformed more than in the first state.

9. the holding portion includes a first plate portion and a second plate portion, a positional relationship between the first plate portion and the second plate portion can be changed; the holding portion holds the first substrate when the first substrate is sandwiched between the first plate portion and the second plate portion in a first state; 8. The keyboard device according to claim 7, wherein the holding of the first substrate by the holding portion is released when the first plate portion and the second plate portion are in a second state in which they are further apart than in the first state.

10. a magnetic induction sensor including a first substrate and a second substrate, each having a conductor disposed thereon, for measuring a distance between the first substrate and the second substrate; a performance operator operable by an operator; a holding section that holds the first substrate between the performance operator and the second substrate; Equipped with At least one of the conductors disposed on the first substrate and the second substrate includes a coil; the holding portion is displaced in accordance with the displacement of the performance operator, the holding portion contacts the opposing surface of the first substrate, the first substrate has a notch or an opening when viewed in a direction perpendicular to a surface of the first substrate on which the conductors are arranged, A performance operation device in which a part of the holding portion enters inside the cutout portion or the opening.

11. a magnetic induction sensor including a first substrate and a second substrate, each having a conductor disposed thereon, for measuring a distance between the first substrate and the second substrate; a performance operator operable by an operator; a first member that is linked to the performance operator; a holding portion that holds the first substrate between the first member and the second substrate; Equipped with At least one of the conductors disposed on the first substrate and the second substrate includes a coil; the holding portion is displaced in accordance with the displacement of the first member, the holding portion contacts the opposing surface of the first substrate, the first substrate has a notch or an opening when viewed in a direction perpendicular to a surface of the first substrate on which the conductors are arranged, A performance operation device in which a part of the holding portion enters inside the cutout portion or the opening.

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