Keyboard device and method for detecting touch key information

Abstract

The invention provides a keyboard device and a method for detecting touch key information, wherein a displacement component is miniaturized and touch key information can be detected with good precision. In the present invention, since the curvature of the flat surface section (82b) is smaller than that of the curved surface section (82a) of the section to be detected (82), the distance between the coil (100) and the section to be detected (82) (flat surface section (82b)) can be set closer in the post-touch performance region than when the section to be detected (82) has a single arc shape centered on the rotation axis (90). As a result, it is possible to enlarge the dynamic range (greatly reduce the sensor output value in the post-touch performance region) without increasing the size of the displacement member (8) (coil (100)). As a result, the displacement member (8) is reduced in size, and post-touch detection can be performed with good accuracy.

Description

Technical Field

[0001] The present invention relates to a keyboard device and a method for detecting key touch information, and particularly to a keyboard device and a method for detecting key touch information that miniaturize a shift member and can accurately detect key touch information at the same time. Background Art

[0002] There is known a technique for detecting key touch information such as the depth or speed of a key touch (hereinafter referred to as "key touch information") using a non-contact sensor. For example, in Patent Document 1, there is described a technique in which a coil 57 (sensor) that generates a magnetic field is formed on a substrate 56, and on the other hand, a metal plate 55 (detected part) facing the coil 57 is fixed to a key 41. According to this technique, since the current (magnetic field) flowing in the coil 57 changes due to the relative displacement of the metal plate 55 with respect to the coil 57 during a key touch, key touch information can be detected based on the change in the current.

[0003] Regarding such a keyboard device, the applicant of the present application filed a patent application for Figure 12 the invention shown (at the time of filing the present application, it was an unpublished Patent Document 2). Figure 12 is a cross-sectional view of a conventional keyboard device 301.

[0004] As Figure 12 shown, in the conventional keyboard device 301 of the prior art, a shift member 207 (detected part) rotatably supported by a holder 10 is linked to the swing of a key 202. A detected part 208 made of a non-magnetic metal is provided on the lower surface of the shift member 207, and as the key 202 swings during a key touch or key release, the amount of intrusion of the detected part 208 into the region facing the coil 90 changes. Key touch information is detected based on the increase or decrease in the sensor output value accompanying the change in the intrusion amount.

[0005] [Prior Art Documents]

[0006] [Patent Documents]

[0007] [Patent Document 1] Japanese Patent Laid-Open No. 03-048295 (for example, lines 7 to 18 in the upper left column on page 9, FIG. 29)

[0008] [Patent Document 2] PCT / JP2022 / 032673 (for example, FIGS. 11 and 14) Summary of the Invention

[0009] [Problems to be Solved by the Invention]

[0010] In order to accurately detect the key touch information based on the sensor output value as in the prior art, it is preferred that the difference between the sensor output value before the key touch and the sensor output value after the key touch is large. If the displacement member 207 (coil 90) is enlarged to increase the difference in the output value, there is a problem of enlarging the size of the keyboard device or increasing the cost.

[0011] The present invention is made to solve the above-mentioned problems, and an object of the present invention is to provide a keyboard device and a method for detecting key touch information that can reduce the size of a displacement member and detect key touch information with high accuracy.

[0012] [Technical means to solve the problem]

[0013] In order to achieve the above-mentioned purpose, the keyboard device of the present invention includes: a plurality of keys arranged along the direction of the scale; a displacement member rotating in conjunction with the swinging of the keys; a detected portion arranged on the outer peripheral surface of the displacement member and having conductivity; and a coil opposite to the detected portion and generating a magnetic field, wherein the detected portion includes at least: a first detected portion located on the front side in the rotation direction of the displacement member and having a curved surface; and a second detected portion connected to the rear side of the first detected portion in the rotation direction and having a smaller curvature than that of the first detected portion.

[0014] The method for detecting touch information of the present invention is a method for detecting touch information of keys in a keyboard device, wherein the keyboard device includes: a plurality of keys arranged along a scale direction; a displacement member rotating in conjunction with the swing of the keys; a detected portion arranged on the outer peripheral surface of the displacement member and having conductivity; and a coil facing the detected portion and generating a magnetic field. The method for detecting touch information detects the touch information of the keys by relatively displacing the detected portion relative to the coil, and the detected portion includes at least: a first detected portion located on the front side of the displacement member in the rotation direction and having a curved surface; and a second detected portion connected to the rear side of the first detected portion in the rotation direction and having a smaller curvature than the first detected portion. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a cross-sectional view of the keyboard device according to the first embodiment.

[0016] Figure 2 It is an exploded perspective view showing a keyboard device in a state where white keys and shift members are removed.

[0017] Figure 3 It is a three-dimensional diagram of the retainer.

[0018] Fig. 4(a) is a partial enlarged sectional view of a keyboard device showing the state before the guide pin of the linkage member is inserted into the groove of the displacement member, and Fig. 4(b) is a partial enlarged sectional view of the keyboard device showing the situation where the displacement member rotates due to its own weight.

[0019] Figure 5 is an exploded perspective view of the keyboard device showing the state where the substrate and the fixing member are removed.

[0020] Fig. 6(a) is Figure 5 a side view of the keyboard device when viewed in the direction of arrow VIa, and Fig. 6(b) is a side view of the keyboard device showing the situation where the substrate is mounted on the holder and the fixing member.

[0021] Fig. 7(a) is a partial enlarged sectional view of the keyboard device showing the state in the middle of the key touch where the white key is touched from Figure 1 the state, and Fig. 7(b) is a partial enlarged sectional view of the keyboard device showing the state where the white key that is further touched from the state of Fig. 7(a) contacts the key stopper.

[0022] Fig. 8(a) is a partial enlarged sectional view of the keyboard device showing the state where the white key is further pressed in from the state of Fig. 7(b), and Fig. 8(b) is a graph showing the relationship between the stroke amount of the white key and the sensor output value.

[0023] Fig. 9(a) is a partial enlarged sectional view of the keyboard device at line IXa-IXa of Fig. 7(b), and Fig. 9(b) is a partial enlarged sectional view of the keyboard device at line IXb-IXb of Fig. 8(a).

[0024] Figure 10 is a sectional view of the keyboard device in the second embodiment.

[0025] Fig. 11(a) is Figure 10 a partial enlarged sectional view of the keyboard device with the XIa part enlarged, and Fig. 11(b) is a partial enlarged sectional view of the keyboard device showing the state where the white key is touched from the state of Fig. 11(a) to the terminal position after being touched.

[0026] Figure 12 is a sectional view of the existing keyboard device 301.

[0027] [Description of reference symbols]

[0028] 1, 201: Keyboard device

[0029] 2, 202: Key

[0030] 2a, 202a: White key (key)

[0031] 2b, 202b: Black key (key)

[0032] 73: Guide pin

[0033] 8: Shifting member

[0034] 80: Groove

[0035] 82: Detected portion

[0036] 82a: Curved surface portion (first detected portion)

[0037] 82b: Flat surface portion (second detected portion)

[0038] 9: Retainer (restricting member)

[0039] 100: Coil

[0040] 12, 12a, 12b: Key stopper Detailed implementation manners

[0041] Hereinafter, with reference to the drawings, preferred implementation manners will be described. First, with reference to Figure 1 , the overall structure of the keyboard device 1 in the first implementation manner will be described. Figure 1 is a sectional view of the keyboard device 1 in the first implementation manner. In addition, Figure 1 the arrow U-D direction, arrow F-B direction, and arrow L-R direction respectively represent the up-down direction, front-back direction, and left-right direction (the arrangement direction of the plurality of keys 2; hereinafter, referred to as the "scale direction") of the keyboard device 1, and the same applies to Figure 2 hereinafter. Figure 1 is a sectional view of the keyboard device 1 obtained by cutting in a plane orthogonal to the scale direction.

[0042] As Figure 1 shown, the keyboard device 1 includes a plurality of (88 in this implementation manner) keys 2 and is a device constituting a keyboard instrument (synthesizer). The keys 2 are composed of a plurality of (52 in this implementation manner) white keys 2a for playing natural notes and a plurality of (36 in this implementation manner) black keys 2b for playing chromatic notes, and the plurality of white keys 2a and black keys 2b are arranged along the scale direction (arrow L-R direction).

[0043] The keyboard device 1 includes a bottom plate 3 for supporting the keys 2. The bottom plate 3 is formed of synthetic resin, steel plate, etc. into a flat plate shape extending along the scale direction, and a chassis 4 is supported on the upper surface of the bottom plate 3.

[0044] At the front end portion of the chassis 4 (the end on the arrow F side), there is provided a front leg portion 40, and the front leg portion 40 is fixed to the bottom plate 3. The front leg portion 40 extends upward from the bottom plate 3, and a support portion 41 for supporting the key 2 extends rearward (on the arrow B side) from the upper end of the front leg portion 40. These front leg portions 40 and support portion 41 are integrally formed by bending a metal plate.

[0045] The rear end of the support portion 41 is fixed (bolted or welded) to a metal rear leg portion 42 extending vertically, and the chassis 4 formed by the respective portions 40 to 42 is formed in a U-shaped (C-shaped) configuration having a space between the support portion 41 and the bottom plate 3 when viewed in the scale direction.

[0046] Next, with reference to Figure 1 and Figure 2 , the details of the structure for rotating the white key 2a or the structure for causing the shift member 8 to rotate in linkage with the rotation of the white key 2a will be described, but the structure is substantially the same for the black key 2b as well. Therefore, the black key 2b also exhibits the same functions and effects as the structure of the white key 2a described below. Figure 2 FIG. is an exploded perspective view of the keyboard device 1 showing the state where the white key 2a and the shift member 8 are removed.

[0047] As shown in Figure 1 and Figure 2 , the white key 2a includes an upper plate 20 whose upper surface (the surface on the arrow U side) is configured as a key surface to be pressed by the player, and a pair of side plates 21 extending downward from both left and right (in the arrow L-R direction) end portions of the upper plate 20. These plate-shaped upper plate 20 and side plates 21 are integrally formed using a resin material, and the white key 2a is formed in a box shape having an opening at the bottom.

[0048] A plate-shaped protruding portion 22 protrudes rearward from the rear end (the end on the arrow B side) of the white key 2a. The pair of protruding portions 22 are provided at intervals along the scale direction (arrow L-R direction) (refer to Figure 2 ), and the pair of protruding portions 22 are pivotally supported by the key shaft member 5.

[0049] The key shaft member 5 includes a mounted portion 50 mounted on the upper surface of the chassis 4 (support portion 41). The mounted portion 50 is formed in a substantially flat plate shape extending along the scale direction, and an insertion portion 51 stands up upward from the rear end side of the mounted portion 50 (refer to the enlarged portion in Figure 2 ).

[0050] A plurality of insertion portions 51 are arranged along the scale direction, and a substantially cylindrical shaft portion 52 is formed at the upper end side of the insertion portion 51. The respective portions 50 to 52 of these key shaft members 5 are integrally formed using a resin material (synthetic resin).

[0051] The shaft portion 52 protrudes from the insertion portion 51 toward both sides in the scale direction, and circular insertion holes 23 into which the shaft portion 52 can be inserted are formed in each of the pair of protruding portions 22 of the white key 2a. When the shaft portion 52 is inserted into the insertion hole 23, the insertion is guided by an inclined surface 53 (refer to Figure 2 the enlarged portion).

[0052] Since the inclined surface 53 rises and inclines in a manner that obliquely cuts the upper end of the end surface of the shaft portion 52 (close to the insertion portion 51), by pressing the pair of protruding portions 22 of the white key 2a from the upper side toward the insertion portion 51 (inserting the insertion portion 51 between the pair of protruding portions 22), the protruding portions 22 slide along the inclined surface 53 of the shaft portion 52. Through the sliding, the pair of protruding portions 22 are elastically deformed so that the mutual interval expands, and thus the shaft portion 52 can be easily inserted into the insertion hole 23 of the white key 2a. By inserting the pair of shaft portions 52 into the insertion holes 23 respectively, the white key 2a is shaft-supported on the key shaft member 5.

[0053] On the upper surface of the front end side (the end on the arrow F side) of the mounted portion 50, cylindrical holding walls 54 for holding the coil spring 6 (refer to Figure 1 ) are formed, and a plurality of holding walls 54 are arranged in the scale direction. Conical convex portions 55 protruding upward are formed at the central portions on the inner peripheral sides of the respective holding walls 54.

[0054] In the white key 2a, a holding wall 24 (refer to Figure 1 ) is formed at a position facing the holding wall 54 up and down. The holding wall 24 is formed in a cylindrical shape extending downward from the upper plate 20 of the white key 2a, and a conical convex portion 25 protruding downward is formed on the inner peripheral side of the holding wall 24. By clamping the coil spring 6 from above and below by the convex portion 55 of the key shaft member 5 and the convex portion 25 of the white key 2a, the coil spring 6 is held on the inner peripheral sides of the holding wall 24 and the holding wall 54. When the white key 2a is depressed, the touch feeling of key depression is imparted by the elastic force of the coil spring 6. On the other hand, when the key is released, the white key 2a is reset to the initial position by the elastic restoring force of the coil spring 6.

[0055] In the substantially central portion of the white key 2a in the front-rear direction (arrow F - B direction), a plate-shaped partition plate 26 (refer to Figure 1 ) extending downward from the upper plate 20 is formed, and the pair of partition plates 26 are arranged at intervals in the front-rear direction. The partition plate 26 is integrally formed with the upper plate 20 and the side plates 21 in a manner that connects the pair of side plates 21 in the scale direction, and a linkage member 7 is installed in the recess 27 surrounded by the respective plates 20, 21, 26.

[0056] The linkage member 7 is a member for causing the displacement member 8 to be linked to the swing of the white key 2a at key-on and key-off. The linkage member 7 includes a columnar insertion portion 70 extending vertically, a plate-like protruding portion 71 protruding forward and backward from the lower end of the insertion portion 70, and a plate-like projecting portion 72 protruding downward from the front end portion of the protruding portion 71 (refer to Figure 1 for the enlarged view), and the respective portions 70 to 72 are integrally formed using a resin material.

[0057] The insertion portion 70 is formed in a shape corresponding to the concave portion 27 of the white key 2a, and the linkage member 7 is attached to the white key 2a by bonding the insertion portion 70 inserted into the concave portion 27 to the white key 2a. A cylindrical guide pin 73 protruding in the scale direction (arrow R side) is integrally formed at the lower end of the projecting portion 72, and the guide pin 73 is hooked on a groove 80 formed in the displacement member 8.

[0058] The groove 80 penetrates both side surfaces of the displacement member 8 facing the scale direction and extends in a direction orthogonal to the scale direction (in the initial position before the white key 2a is pressed, it rises and inclines forward and upward). In the initial position ( Figure 1 state) before the white key 2a is pressed, the groove 80 extends in a manner that intersects the displacement locus of the guide pin 73 around the shaft portion 52. By the sliding of the guide pin 73 along the groove 80, the displacement member 8 is rotationally linked to the white key 2a. In the following description, the upper and lower surfaces of the groove 80 in the displacement member 8 on which the guide pin 73 slides at key-on (key-off) of the white key 2a are described as the upper sliding surface 80a and the lower sliding surface 80b.

[0059] An axial hole 81 penetrating the displacement member 8 in the scale direction is formed in the displacement member 8, and a rotary shaft 90 formed in the holder 9 is inserted into the axial hole 81 (refer to Figure 1 ). Thus, the displacement member 8 is axially supported by the holder 9 in a rotatable manner. In the following description, the outer surface of the displacement member 8 in a state where the displacement member 8 is supported by the rotary shaft 90 and facing a direction orthogonal to the axial direction (scale direction) of the rotary shaft 90 is described as the "outer peripheral surface".

[0060] On the outer peripheral surface of the displacement member 8, a detected portion 82 is formed by bonding a metal plate or performing electroplating (refer to Figure 1 for the enlarged view). A substrate 10 is provided at a position facing the detected portion 82 (below the displacement member 8), and a coil 100 for generating a magnetic field is formed on the substrate 10 (refer to Figure 1 for the enlarged view).

[0061] The coil 100 is formed by a conductive pattern on the substrate 10, but in Figure 1In [the figure], the coil 100 (the thickness of the coil 100) on the substrate 10 is schematically shown. Details will be described later. The keying information of the white key 2a is detected by the detection portion 82 of the shift member 8 shifting toward the region facing the coil 100 (hereinafter referred to as the "detection region").

[0062] Next, with reference to Figure 3 , the detailed structure of the holder 9 will be described, but it is also appropriate to refer to Figure 1 , Figure 2 for the description. Figure 3 is a perspective view of the holder 9. In addition, in Figure 3 , the holder 9 is shown as viewed from the same angle as Figure 2 .

[0063] As Figure 3 shows, the holder 9 includes a plate-shaped wall portion 91 integrally formed with a rotating shaft 90 (refer to the enlarged portion of Figure 3 ). The rotating shaft 90 connects between a pair of wall portions 91 facing each other in the scale direction. The rotating shaft 90 is formed as an ellipse extending vertically. A cutout 83 for inserting the rotating shaft 90 into the shaft hole 81 is formed in the shift member 8. The cutout 83 is a groove that linearly connects the outer peripheral surface of the shift member 8 and the shaft hole 81 (a hole penetrating the shift member 8 in the scale direction), and extends in the direction opposite to the groove 80 with the shaft hole 81 interposed therebetween. The groove width of the cutout 83 is set to be substantially the same as the longitudinal dimension of the elliptical rotating shaft 90 in the front-rear direction (the width dimension of the rotating shaft 90 in the arrow F-B direction).

[0064] Therefore, as shown by the arrow A in Figure 3 , in a state where the cutout 83 of the shift member 8 faces downward, the shift member 8 is inserted between the pair of wall portions 91 in such a manner that the rotating shaft 90 is inserted into the cutout 83, whereby the rotating shaft 90 is inserted into the shaft hole 81. The diameter of the shaft hole 81 is substantially the same as the vertical dimension of the rotating shaft 90 (the longitudinal dimension of the rotating shaft 90 in the arrow U-D direction). After the rotating shaft 90 is inserted into the shaft hole 81 from the cutout 83, the shift member 8 is rotated so that the cutout 83 faces rearward (the arrow B side), whereby the shift member 8 is pivotally supported on the rotating shaft 90.

[0065] The holder 9 includes a substantially flat plate-shaped mounting portion 92 extending in the scale direction, and the mounting portion 92 is mounted on the support portion 41 of the chassis 4 (refer to Figure 1)。A plurality of wall portions 91 arranged along the scale direction stand upright upward from the mounted portion 92. If a pair of wall portions 91 sandwiching the displacement member 8 is set as a group, then multiple groups of wall portions 91 are arranged along the scale direction. In the present embodiment, one octave (12 pieces) of displacement members 8 is axially supported by one holder 9. The mounted portion 92 is fixed (screwed) to the lower surface of the support portion 41 of the chassis 4 (refer to Figure 1 ), and the wall portion 91 is inserted from below into a through hole 43 formed in the support portion 41 (refer to Figure 2 ).

[0066] A through hole 93 penetrating the mounted portion 92 vertically is formed between a pair of wall portions 91 (refer to the enlarged portion of Figure 3 ), and a part of the displacement member 8 is inserted into the through hole 93. That is, in a state where the displacement member 8 is axially supported by the holder 9, the portion on the lower end side of the displacement member 8 is located below the mounted portion 92 (the support portion 41 of the chassis 4) (refer to Figure 1 ), and the displacement of the displacement member 8 in this position is allowed by the through hole 93.

[0067] There is a flat hanging portion 94 that slopes downward and forward from the mounted portion 92 of the holder 9. If a pair of hanging portions 94 facing each other across the displacement member 8 is set as a group, then multiple groups of hanging portions 94 are arranged along the scale direction, and the lower ends of the multiple groups of hanging portions 94 are connected to each other along the scale direction by a connecting portion 95. Each part 91 - 95 of the holder 9 including the rotating shaft 90 is integrally formed using a resin material, but the holder 9 may also be formed of multiple parts.

[0068] The front end portion of the substrate 10 (refer to Figure 1 ) is supported by the connecting portion 95, and the rear end portion of the substrate 10 is supported by the chassis 4 (support portion 41) via a fixing member 11 (refer to Figure 1 ). Regarding the details of the support structure of the substrate 10, it will be described later with reference to Figure 5 and FIGS. 6(a) and 6(b).

[0069] As shown by the arrow B in Figure 3 , in a state where the displacement member 8 is axially supported by the holder 9, the displacement member 8 can be moved in a manner of twisting in the scale direction (swinging the displacement member 8 in the scale direction). The reason is that a minute gap is formed between the rotating shaft 90 and the shaft hole 81, and a pair of wall portions 91 can undergo elastic deformation. By the swinging of the displacement member 8 in the scale direction, the guide pin 73 of the linkage member 7 (refer to FIG. 4(a)) engages with the groove 80.

[0070] Refer to Figure 3With reference to FIGS. 4(a) and 4(b), the engagement method will be described. FIG. 4(a) is a partially enlarged sectional view of the keyboard device 1 showing the state before the guide pin 73 of the link member 7 is inserted into the groove 80 of the displacement member 8, and FIG. 4(b) is a partially enlarged sectional view of the keyboard device 1 showing the case where the displacement member 8 rotates due to its own weight. In addition, in FIG. 4(a), the state where the retainer 9 is assembled to the support portion 41 of the chassis 4 is shown, but FIG. 4(a) corresponds to a sectional view obtained by cutting along the line IVa-IVa shown by the enlarged portion of Figure 3 In addition, FIGS. 4(a) and 4(b) are views of the displacement member 8 observed from the side, but for easy understanding, the detected portion 82 is shaded.

[0071] As Figure 3 shown in FIGS. 4(a) and 4(b), the groove 80 of the displacement member 8 extends in a direction away from the rotation axis 90 ( Figure 3 the shaft hole 81 shown) of the retainer 9, and the groove width of the groove 80 gradually increases as it moves away from the rotation axis 90.

[0072] More specifically, the lower sliding surface 80b (see FIG. 4(a)) of the displacement member 8 is a plane linearly extending in a direction substantially orthogonal to the axial direction of the rotation axis 90 (substantially parallel to the direction of the arrow F-B in FIG. 4(a)), while the upper sliding surface 80a is composed of a plane parallel to the lower sliding surface 80b, an inclined surface rising and inclining forward and upward from the leading edge (the end on the arrow F side) of the plane portion, and a curved surface smoothly connecting these planes and inclined surfaces.

[0073] On the outer peripheral surface of the displacement member 8, an opening of the groove 80 is formed by the leading edge of the inclined surface of the upper sliding surface 80a and the leading edge of the lower sliding surface 80b, and the guide pin 73 of the link member 7 is inserted into the opening along the insertion direction C. The insertion direction C of the guide pin 73 is the same direction as the sliding direction of the guide pin 73 along the groove 80 (the portion where the upper and lower sliding surfaces 80a and 80b face each other in parallel).

[0074] In the displacement member 8, a restricting wall 84 connecting the inclined surface of the upper sliding surface 80a and the front end portion of the lower sliding surface 80b is formed at the opening portion of the groove 80. The restricting wall 84 is a wall for restricting the guide pin 73 of the link member 7 from being pulled out of the groove 80. Although not shown, in the assembled state of the white key 2a ( Figure 1 the state) after the guide pin 73 is engaged with the groove 80, the restricting wall 84 and the guide pin 73 are arranged at overlapping positions in the insertion direction C of the guide pin 73.

[0075] Therefore, when the white key 2a is pivotally supported on the key shaft member 5 (see Figure 1In the state of , if the guide pin 73 is inserted only along the insertion direction C from the opening of the slot 80, the restriction wall 84 will interfere with the insertion. This interference can be substantially avoided by the swing of the shift member 8 shown by the arrow B in Figure 3 However, in the present embodiment, a front inclined surface 84a for facilitating the insertion of the guide pin 73 into the slot 80 is formed on the side surface of the restriction wall 84 (see Fig. 4(a)). The side surface of the restriction wall 84 refers to the surface facing the opposite side to the protruding direction of the guide pin 73 in the scale direction (the near front side in the direction perpendicular to the paper surface of Fig. 4(a)).

[0076] The front inclined surface 84a is inclined in such a way as to obliquely cut the leading edge portion of the side surface of the restriction wall 84. Therefore, when the guide pin 73 is inserted along the insertion direction C from the opening of the slot 80, the shift member 8 slightly generates Figure 3 the swing shown by the arrow B in (slightly twisting and displacing the shift member 8 toward the inside in the direction perpendicular to the paper surface of Fig. 4(a)). Thereby, the guide pin 73 can slide along the front inclined surface 84a, and at the same time, the guide pin 73 can be engaged with the slot 80. Therefore, the guide pin 73 can be easily engaged with the slot 80, and thus the workability of the assembly operation of the white key 2a can be improved.

[0077] In addition, a rear inclined surface 84b is also formed on the side surface of the restriction wall 84. The rear inclined surface 84b is inclined in such a way as to obliquely cut the rear edge (the end portion on the arrow B side) portion of the side surface of the restriction wall 84. Therefore, when the guide pin 73 is withdrawn from the slot 80 in the direction opposite to the insertion direction C, the shift member 8 slightly generates Figure 3 the swing shown by the arrow B in (slightly twisting and displacing the shift member 8 toward the inside in the direction perpendicular to the paper surface of Fig. 4(a)). Thereby, the guide pin 73 can slide along the rear inclined surface 84b, and at the same time, the guide pin 73 can be removed from the slot 80. Therefore, the guide pin 73 can be easily removed from the slot 80, and thus the workability of the replacement or maintenance operation of the white key 2a can be improved.

[0078] Here, as shown in Fig. 4(b), in the state where the guide pin 73 is not engaged with the slot 80, the shift member 8 rotates around the rotation shaft 90 due to its own weight. If the shift member 8 comes into contact with the coil 100 of the substrate 10 due to the rotation, there is a concern that the coil 100 may be damaged.

[0079] If the detected portion 82 of the displacement member 8 is formed in a single arc shape centered on the rotation axis 90, even if the displacement member 8 rotates around the rotation axis 90 due to its own weight, the detected portion 82 will not contact the coil 100. However, as will be described in detail later, the detected portion 82 of the present embodiment is composed of an arc-shaped curved surface portion 82a centered on the rotation axis 90 and a linear flat surface portion 82b connected to the leading edge of the curved surface portion 82a. Therefore, when the guide pin 73 is removed from the groove 80, if the displacement member 8 rotates around the rotation axis 90 due to its own weight, there is a concern that the flat surface portion 82b of the detected portion 82 may contact the coil 100.

[0080] In contrast, in the present embodiment, it is configured to prevent such contact between the flat surface portion 82b and the coil 100. Specifically, a convex portion 85 that wraps the groove 80 (the upper and lower sliding surfaces 80a, 80b) protrudes from the side surface of the displacement member 8, and a wall portion 91 (mounting portion 92) of the retainer 9 is formed on the displacement trajectory around the rotation axis 90. Moreover, it is configured that when the displacement member 8 rotates around the rotation axis 90 due to its own weight, before the flat surface portion 82b of the detected portion 82 contacts the coil 100, the wall portion 91 (mounting portion 92) of the retainer 9 contacts the convex portion 85 at the contact point P1.

[0081] In addition, it is configured that while the wall portion 91 contacts the convex portion 85 at the contact point P1, the connecting portion 95 of the retainer 9 also contacts the displacement member 8 at the contact point P2. That is, a part of the retainer 9 (the wall portion 91, the mounting portion 92, and the connecting portion 95) located on the displacement trajectory of the displacement member 8 functions as a restricting member that restricts the contact between the detected portion 82 (flat surface portion 82b) and the coil 100.

[0082] Thus, even when the detected portion 82 is not a single arc shape centered on the rotation axis 90 (for example, the flat surface portion 82b is formed), the contact between the detected portion 82 and the coil 100 can be restricted by the retainer 9 when the displacement member 8 rotates around the rotation axis 90 due to its own weight. Therefore, breakage of the coil 100 caused by their contact can be prevented.

[0083] Next, with reference to Figure 5 FIG. 6(a) and FIG. 6(b), the mounting structure of the substrate 10 will be described. Figure 5 FIG. 5 is an exploded perspective view of the keyboard device 1 showing a state in which the substrate 10 and the fixing member 11 are removed. FIG. 6(a) is a side view of the keyboard device 1 when viewed in the direction of arrow VIa of Figure 5 FIG. 5, and FIG. 6(b) is a side view of the keyboard device 1 showing a situation where the substrate 10 is mounted on the retainer 9 and the fixing member 11. In addition, in FIG. 6(a), a state in which the fixing member 11 is fixed to the support portion 41 of the chassis 4 is illustrated.

[0084] As Figure 5 shown, a pair of protrusions 110 arranged in the scale direction (arrow L-R direction) protrude from the upper surface of the fixed member 11. In the support portion 41 of the chassis 4, through holes 44 are formed at positions corresponding to the protrusions 110. By inserting the pair of protrusions 110 into the through holes 44, the mounting position of the fixed member 11 relative to the support portion 41 is positioned.

[0085] A through hole 111 penetrating the fixed member 11 vertically is formed at a position further rearward than the pair of protrusions 110. By fastening a screw (not shown) inserted into the through hole 111 from below to the internal thread hole 45 of the support portion 41 of the chassis 4, the fixed member 11 is mounted on the lower surface of the support portion 41.

[0086] A fixing portion 112 for fixing the substrate 10 protrudes forward from the front surface (the surface facing the arrow F side) of the fixed member 11, and an internal thread hole 113 extending vertically is formed in the fixing portion 112. A plurality of fixed members 11 are arranged in the scale direction. At the rear end side (the end portion on the arrow B side) of the substrate 10, through holes 101 are formed at positions corresponding to the internal thread holes 113 of the plurality of fixed members 11. By fastening a screw (not shown) inserted into the through hole 101 of the substrate 10 from below to the internal thread hole 113 of the fixed member 11, the rear end portion of the substrate 10 is fixed to the fixed member 11.

[0087] As shown in FIG. 6(a), a protrusion 96 protrudes downward from the lower surface of the hanging portion 94 of the holder 9, and a protrusion 97 protrudes rearward from the rear surface (the surface facing the arrow B side) of the connecting portion 95. The protrusions 96 and 97 are integrally formed with the hanging portion 94 and the connecting portion 95. In addition, although not shown, a plurality of the protrusions 96 and 97 are arranged in the scale direction.

[0088] An inclined surface 96a rising and inclining forward and upward is formed at the leading edge (the end portion on the arrow F side) of the protrusion 96, and an inclined surface 97a descending and inclining rearward and downward is formed at the trailing edge (the end portion on the arrow B side) of the protrusion 97. The inclined surfaces 96a and 97a are formed in parallel. The interval between the inclined surfaces 96a and 97a, or the interval between the lower surface of the protrusion 96 and the upper surface of the protrusion 97 is substantially the same as the thickness of the substrate 10.

[0089] As shown in Fig. 6(b), when the substrate 10 is mounted on the holder 9 and the fixing member 11, first, the substrate 10 is inserted between the protrusions 96 and 97 in a state inclined parallel to the respective inclined surfaces 96a and 97a. Then, as shown by the arrow D, the front end of the substrate 10 is rotated between the protrusions 96 and 97, and the rear end portion of the substrate 10 is screwed to the fixing member 11. Thus, the substrate 10 is supported by the support portion 41 of the chassis 4 via the holder 9 and the fixing member 11.

[0090] Thus, in the present embodiment, the substrate 10 is supported by the holder 9 by inserting the front end of the substrate 10 between the protrusions 96 and 97 (insertion portion). That is, the substrate 10 is not screwed to the holder 9 but is simply inserted between the protrusion 96 and the protrusion 97. Therefore, it is not necessary to form a through hole (such as the through hole 101) for screwing to the holder 9 at the front end portion of the substrate 10. As a result, the front-rear dimension of the substrate 10 can be shortened, and thus the manufacturing cost of the substrate 10 can be reduced.

[0091] Next, referring to Figs. 7(a) and 7(b), the operation of the shift member 8 accompanying the key touch (key release) of the white key 2a will be described. Fig. 7(a) is a partially enlarged sectional view of the keyboard device 1 showing the state in the middle of the key touch of the white key 2a (before the white key 2a contacts the key touch stopper 12) from the state of Figure 1 Fig. 7(b) is a partially enlarged sectional view of the keyboard device 1 showing the state in which the white key 2a further pressed from the state of Fig. 7(a) contacts the key touch stopper 12.

[0092] As shown in Figs. 7(a) and 7(b), when the white key 2a is touched, if the guide pin 73 rotates downward (clockwise direction in Figs. 7(a) and 7(b)), the lower sliding surface 80b is pressed into by the guide pin 73. Thereby, the shift member 8 rotates around the rotation axis 90 of the holder 9 (clockwise direction in Figs. 7(a) and 7(b)).

[0093] With the rotation, the detected portion 82 of the shift member 8 is displaced relative to the substrate 10 supported by the holder 9. That is, as the stroke amount of the white key 2a increases from the state before the key touch, the intrusion amount of the detected portion 82 into the detection region increases. The so-called intrusion amount of the detected portion 82 is the size of the area where the detected portion 82 and the coil 100 face each other in the thickness direction (vertical direction) of the substrate 10.

[0094] On the other hand, when the white key 2a is released after being pressed, the guide pin 73 is returned by the coil spring 6 (refer to Figure 1) rotates in a manner of returning to the initial position (in the counterclockwise direction of FIGS. 7(a) and 7(b)) by the elastic force of ( ). By the rotation of the guide pin 73, the upper sliding surface 80a of the groove 80 is pushed up by the guide pin 73, whereby the displacement member 8 rotates about the rotation axis 90 (in the counterclockwise direction of FIGS. 7(a) and 7(b)). At this time, the intrusion amount of the detected portion 82 with respect to the detection area decreases.

[0095] Since the detected portion 82 is formed of a non-magnetic metal (such as copper), in a state where a magnetic field is generated by flowing current through the coil 100, if the intrusion amount of the detected portion 82 into the detection area increases, the inductance of the coil 100 decreases, and if the intrusion amount of the detected portion 82 into the detection area decreases, the inductance of the coil 100 increases. The sensor output value (V) changes based on the increase and decrease of the inductance of the coil 100 (refer to FIG. 8(b)). The touch key information (note information) is detected based on the increase and decrease of the sensor output value.

[0096] Regarding the technology of detecting touch key information using such a non-contact sensor, the applicant of the present application Figure 12 filed a patent application for the invention shown (at the time of filing the present application, it was unpublished PCT / JP2022 / 032673). Figure 12 is a cross-sectional view of the existing keyboard device 301.

[0097] In the existing keyboard device 301, the following problem has occurred: the initial position (angle) of the displacement member 207 before touching the key, or the displacement amount (rotation amount) of the displacement member 207 accompanying the touching of the key sometimes deviates from the design value.

[0098] As the reason for the occurrence of the above problem, in the Figure 12 structure shown, the following aspects can be cited: the holder 210 that supports the key 202 in a rotatable manner is fixed to the chassis 204, while the holder 10 that supports the displacement member 207 in a rotatable manner is fixed to the bottom plate 3 via the substrate 9. That is, since the key 202 and the displacement member 207 are assembled in different parts, the relative position accuracy between the key 202 and the displacement member 207 is likely to be reduced due to assembly errors and the like. Therefore, the engagement position between the guide pin 229 of the key 202 and the groove 270 of the displacement member 207 is likely to deviate from the design value.

[0099] In contrast, in the present embodiment, as shown in FIGS. 7(a) and 7(b), the structure includes the following components: a chassis 4 (a first support member); white keys 2a (a plurality of keys 2), swingably supported on the chassis 4; a displacement member 8, linked to the swing of the white keys 2a; a retainer 9 (a second support member), supporting the displacement member 8 in a displaceable manner, and the retainer 9 is mounted on the chassis 4; and a coil 100 (a sensor), detecting the displacement of the displacement member 8 facing the detected portion 82 of the displacement member 8.

[0100] That is, since the white keys 2a and the retainer 9 that axially supports the displacement member 8 are assembled on the same chassis 4, the relative position accuracy between the white keys 2a and the displacement member 8 can be improved. As a result, the guide pin 73 of the linkage member 7 and the groove 80 of the displacement member 8 can be engaged with good positional accuracy consistent with the design. Therefore, the initial position (angle) of the displacement member 8 before key touch or the displacement amount (rotation amount) of the displacement member 8 accompanying key touch is also easily consistent with the design value. Therefore, the key touch information of the white keys 2a can be detected with good accuracy.

[0101] In addition, in the initial position ( Figure 1 state) before key touch, the lower sliding surface 80b of the groove 80 rises and inclines forward and upward. When the displacement member 8 rotates to an angle where the lower sliding surface 80b is along the horizontal direction during key touch, the guide pin 73 slides toward the rear end side (arrow B side) of the lower sliding surface 80b (refer to Figure 1 and FIG. 7(a)). On the other hand, when the displacement member 8 further rotates from the angle where the lower sliding surface 80b is along the horizontal direction during key touch, the guide pin 73 slides toward the front end side (arrow F side) of the lower sliding surface 80b (refer to FIGS. 7(a) and 7(b)).

[0102] That is, since the sliding direction of the guide pin 73 along the groove 80 reverses during key touch (the guide pin 73 reciprocates in the groove 80 during key touch), the sliding range of the guide pin 73 relative to the groove 80 can be reduced. As a result, the groove 80 can be formed short, so the accuracy of the shape of the groove 80 is easily improved. Thus, the engagement position between the guide pin 73 and the groove 80 is also easily consistent with the design value, and therefore the key touch information of the white keys 2a can be detected with good accuracy.

[0103] In addition, since the substrate 10 is directly mounted on the retainer 9 that axially supports the displacement member 8, the relative position accuracy between the displacement member 8 and the coil 100 of the substrate 10 can also be improved. As a result, the gap between the coil 100 and the detected portion 82 of the displacement member 8 is also easily the same size as the design value, and therefore the key touch information of the white keys 2a can be detected with good accuracy.

[0104] In addition, in the present embodiment, the substrate 10 is directly mounted on the holder 9, but it may also be configured such that the substrate 10 is mounted on a support member separately provided from the holder 9. As an example of such a structure, the following structure can be exemplified: the drooping portion 94 and the connecting portion 95 of the holder 9 are omitted and the substrate 10 is extended forward (in the direction of arrow F), and the front end portion of the substrate 10 is supported by the same parts as the fixing member 11 (refer to FIGS. 6(a) and 6(b)). In such a structure, the substrate 10 provided with the coil 100 and the holder 9 on which the displacement member 8 is shaft-supported can be supported on the same chassis 4, so that the gap between the coil 100 and the detected portion 82 can also easily become a size consistent with the design value. Therefore, the key touch information of the white key 2a can be detected with good accuracy.

[0105] Here, it is also possible to integrally form the key shaft member 5 (refer to Figure 2 ) that supports the white key 2a in a swingable manner, or the fixing member 11 (refer to FIGS. 6(a) and 6(b)) that fixes the rear end of the substrate 10, with the holder 9. However, if these parts are integrally formed, the parts become larger, and errors are likely to occur in the dimensions of the parts themselves (for example, the length in the front-rear direction). If such dimensional errors occur, the engagement position of the guide pin 73 with the groove 80, or the gap between the detected portion 82 and the coil 100 is likely to deviate from the design value. Therefore, the key touch information of the white key 2a cannot be detected with good accuracy.

[0106] In contrast, in the present embodiment, since the key shaft member 5 (refer to Figure 2 ), the holder 9, and the fixing member 11 are different parts, the respective parts can be miniaturized. As a result, it is easy to improve the dimensional accuracy of the key shaft member 5, the holder 9, and the fixing member 11 themselves.

[0107] In addition, although not shown, one key 2 of an octave is shaft-supported by the key shaft member 5 (refer to Figure 2 ), and as described above, one octave (12 pieces) of displacement members 8 (refer to Figure 3 ) are shaft-supported by the holder 9.

[0108] That is, a plurality of key shaft members 5 and holders 9 are arranged in the scale direction. Thus, compared with a structure in which all the keys 2 arranged in the scale direction are shaft-supported by one key shaft member 5, or a structure in which all the displacement members 8 arranged in the above direction are shaft-supported by one holder 9, the key shaft member 5 or the holder 9 can be miniaturized. Therefore, it is easy to improve the dimensional accuracy of the key shaft member 5 or the holder 9 themselves.

[0109] In addition, as described above, since the fixing members 11 (refer to FIGS. 6(a) and 6(b)) are also arranged in the scale direction, the fixing members 11 can be miniaturized as compared with the case where the substrate 10 is supported by one fixing member 11 extending in the scale direction. As a result, it is easy to improve the dimensional accuracy of the fixing members 11 themselves.

[0110] By improving the dimensional accuracy of the key shaft member 5, the retainer 9, and the fixing members 11 themselves in this way, the engagement position of the guide pin 73 with the groove 80 or the gap between the detected portion 82 and the coil 100 is likely to match the design value. Therefore, the key touch information of the white key 2a can be detected with good accuracy.

[0111] As shown in FIG. 7(b), the swing when the white key 2a is depressed is restricted by the key touch stopper 12. The key touch stopper 12 is a cushioning material bonded to the upper surface of the front end side of the support portion 41 of the chassis 4. The area until the lower surface of the white key 2a contacts the key touch stopper 12 during key touch is the normal playing area. On the other hand, the performance of depressing the key deeper than the terminal position of the normal performance (the state of FIG. 7(b) where the white key 2a contacts the key touch stopper 12) is the post-touch playing area. When performing the post-touch performance, a musical tone different from that during the normal performance is generated, for example, a musical tone of a different timbre or a musical tone with an effect (change in volume or vibrato) imparted.

[0112] Moreover, in the present embodiment, in addition to detecting the key touch information during the normal performance, the key touch information during the post-touch performance is also detected based on the change in the magnetic field of the coil 100 (increase or decrease in the sensor output value). With reference to FIGS. 7(a), 7(b), 8(a), and 8(b), the detection methods for these performances will be described.

[0113] FIG. 8(a) is a partial enlarged sectional view of the keyboard device 1 showing a state where the white key 2a is further depressed from the state of FIG. 7(b), and FIG. 8(b) is a graph showing the relationship between the stroke amount of the white key 2a and the sensor output value. The vertical axis represents the magnitude (V) of the sensor output value, and the horizontal axis represents the stroke amount of the key 2 of the white key 2a. In addition, in FIG. 8(b), for easy understanding, the range of the post-touch performance area or the change in the sensor output value is schematically shown.

[0114] As shown in FIG. 8(a), when the white key 2a is further depressed from the terminal position of the normal performance (the state of FIG. 7(b)), the key touch stopper 12 is compressed by the white key 2a, and at the same time, the lower sliding surface 80b of the groove 80 is pressed downward by the guide pin 73 of the linkage member 7. As a result, the intrusion amount of the detected portion 82 into the detection area further increases.

[0115] As shown in Fig. 8(b), if the intrusion amount of the detected portion 82 into the detection area facing the coil 100 increases, the sensor output value decreases. That is, when the white key 2a is depressed, as the depression amount of the white key 2a increases, the sensor output value gradually decreases. On the other hand, when the white key 2a is released, the sensor output value gradually increases.

[0116] In order to accurately detect the key touch information based on the sensor output value, it is preferable that the difference between the sensor output value before key touch and the sensor output value at the terminal position of key touch (hereinafter referred to as "dynamic range") is large. In particular, in the present embodiment, in addition to detecting normal performance, the after-touch performance is also detected according to the change in the sensor output value shown in Fig. 8(b). Therefore, in order to accurately detect the after-touch, it is necessary to significantly reduce the sensor output value when the white key 2a in contact with the key touch stopper 12 is further depressed.

[0117] The sensor output value decreases as the area of the coil 100 facing the detected portion 82 increases, and also decreases as the distance between the coil 100 and the detected portion 82 approaches. Therefore, for example, as shown by the dashed line E in Fig. 8(a), if the detected portion 82 is formed in a single arc shape centered on the rotation axis 90 of the holder 9, when the shift member 8 rotates to the after-touch performance area, the distance between the detected portion 82 and the coil 100 cannot be made sufficiently close. Therefore, as shown by the dashed line F in Fig. 8(b), it is difficult for the sensor output value to decrease in the after-touch performance area.

[0118] That is, when the detected portion 82 is formed in a single arc shape centered on the rotation axis 90 of the holder 9, it is difficult to expand the dynamic range, so the after-touch cannot be accurately detected. In addition, if the shift member 8 (coil 100) is enlarged in order to expand the dynamic range, there is a problem of increasing the size or cost of the keyboard device 1.

[0119] In contrast, in the present embodiment, it is configured to be able to accurately detect the after-touch by providing a curved surface portion 82a and a flat surface portion 82b on the detected portion 82. The following describes the structure. In the following description related to the detected portion 82, based on the rotation direction of the shift member 8, the direction in which the shift member 8 rotates when the key is depressed is defined as the front side of the detected portion 82, and the opposite side is defined as the rear side for description.

[0120] The portion of the detected portion 82 on the front side (arrow B side) in the rotation direction of the displacement member 8 is a curved surface portion 82a, and the portion connected to the rear side of the curved surface portion 82a in the rotation direction is a flat surface portion 82b. The curved surface portion 82a is formed in an arc shape centered on the rotation axis 90 (a curved shape protruding away from the rotation axis 90), and the flat surface portion 82b is formed in a flat shape extending along the tangent direction of the rear end (the end on the arrow F side) of the curved surface portion 82a.

[0121] That is, since the curvature of the flat surface portion 82b is smaller than that of the curved surface portion 82a, the distance between the coil 100 and the detected portion 82 (flat surface portion 82b) can be made closer in the post-touch playing area compared to the case where the detected portion 82 is a single arc shape centered on the rotation axis 90 as described above. Thus, the dynamic range can be expanded (the sensor output value is significantly reduced in the post-touch playing area) without increasing the size of the displacement member 8 (coil 100). That is, the displacement member 8 can be miniaturized, and at the same time, post-touch can be detected with good accuracy.

[0122] In particular, in the present embodiment, since the flat surface portion 82b is formed in a flat shape, the distance between the coil 100 and the detected portion 82 (flat surface portion 82b) can be made as close as possible in the post-touch playing area compared to the case where the flat surface portion 82b is a curved surface with a curvature smaller than that of the curved surface portion 82a. Therefore, the dynamic range can be effectively expanded.

[0123] In addition, in the post-touch playing area (terminal position), the flat surface portion 82b faces the coil 100 (substrate 10) substantially in parallel, so the distance between the coil 100 and the detected portion 82 (flat surface portion 82b) can be made as close as possible. Thus, the dynamic range can also be effectively expanded. In addition, the so-called substantially parallel preferably means a state in which the flat surface portion 82b and the coil 100 (substrate 10) face each other in parallel without contacting each other, but they may also face each other non-parallelly.

[0124] In this way, the key touch information of the white key 2a can be detected with good accuracy by expanding the dynamic range of the sensor output value. In particular, as in the present embodiment, when detecting post-touch by the change of the sensor output value, it is particularly preferable that the dynamic range is large (the sensor output value is significantly reduced in the post-touch playing area). Thus, post-touch can be detected with good accuracy.

[0125] In addition, in the present embodiment, at the initial position before key touch (refer to Figure 1(in the amplification part), the curved surface portion 82a of the detected portion 82 and the coil 100 are arranged at positions overlapping in the vertical direction (the thickness direction of the substrate 10). That is, since the curved surface portion 82a of the detected portion 82 and the coil 100 face each other vertically at the initial position before the key touch, a change in the sensor output value accompanying the rotation of the detected portion 82 can be generated immediately after the key touch. Thereby, the key touch information can be detected with good accuracy.

[0126] Here, as a prior art for detecting after the key touch, there is known a technique of pressing a pressure sensor with a hammer linked to the swing of the key at the time of key touch (for example, Japanese Patent Laid-Open No. 08-234751). In such a keyboard device, if the key touch stopper that restricts the swing of the key at the time of key touch is formed to be relatively hard, when the key contacts the stopper at the time of key touch, it is easy to give the performer a feeling of reaching the end of normal performance (hereinafter, referred to as "full stroke feeling").

[0127] However, if the key touch stopper is formed to be hard, it is difficult to greatly displace the key (hammer) during the performance after the key touch, so it is impossible to accurately detect the state after the key touch. On the other hand, if only the key touch stopper is formed to be soft, it is difficult to obtain the full stroke feeling when the key contacts the key touch stopper, so a performer performing normal performance may sometimes press the key into the area after the key touch. Therefore, it is impossible to accurately distinguish and detect normal performance and the state after the key touch. In contrast, the key touch stopper 12 of the present embodiment is configured to solve such problems.

[0128] Referring to FIGS. 9(a) and 9(b), the detailed structure of the key touch stopper 12 will be described. FIG. 9(a) is a partial enlarged sectional view of the keyboard device 1 taken along line IXa-IXa of FIG. 7(b), and is a sectional view showing the state where the white key 2a swings to the terminal position of normal performance. In addition, FIG. 9(b) is a partial enlarged sectional view of the keyboard device 1 taken along line IXb-IXb of FIG. 8(a), and is a sectional view showing the case where the white key 2a is further pressed in (performed the performance after the key touch) from the state of FIG. 9(a). In addition, in FIGS. 9(a) and 9(b), only the main part of the keyboard device 1 is shown, and the illustration of other parts (for example, the key 2 adjacent to the white key 2a) is omitted.

[0129] As shown in FIGS. 9(a) and 9(b), the key stopper 12 includes a first buffer layer 120, which is bonded to the upper surface of the support portion 41 of the chassis 4 by a double-sided tape or an adhesive and is made of foamed urethane. A rigid layer 121 made of polyethylene terephthalate (PET) is laminated on the surface side of the first buffer layer 120 (the side plate 21 side of the white key 2a). In addition, a second buffer layer 122 made of felt is laminated on the surface side of the rigid layer 121, and the layers 120-122 are bonded to each other by an adhesive or a double-sided tape, etc.

[0130] Thus, in the present embodiment, a rigid layer 121 harder than the first buffer layer 120 is laminated on the surface side of the relatively soft first buffer layer 120. Thereby, as shown in FIG. 9(a), when the pair of side plates 21 of the white key 2a contact the key stopper 12 (the second buffer layer 122) during key pressing, a relatively hard full-stroke feeling can be imparted to the performer through the rigid layer 121.

[0131] In addition, even when the rigid layer 121 is pressed into the first buffer layer 120 side by the pair of side plates 21 during normal playing, the first buffer layer 120 is compressed as a whole by the relatively hard rigid layer 121 (the pressing force of the white key 2a is dispersed by the rigid layer 121), so the pressure applied to the first buffer layer 120 is relatively small. Thereby, even if the first buffer layer 120 is relatively soft, the white key 2a can be prevented from being pressed into the post-touch playing area. Therefore, it is possible to prevent a key press for normal playing from being detected as a post-touch.

[0132] On the other hand, as shown in FIG. 9(b), when the rigid layer 121 is strongly pressed in during post-touch playing, the white key 2a can be greatly displaced by the deformation of the relatively soft first buffer layer 120. Therefore, post-touch can be detected with good accuracy. That is, normal playing and post-touch can be distinguished and detected with good accuracy.

[0133] In addition, even when the key stopper 12 is strongly pressed in by the pair of side plates 21, since the rigid layer 121 is deformed in a way that causes flexure, the load caused by the pressing can also be dispersed by the rigid layer 121. That is, since the situation where the pair of side plates 21 sink into the first buffer layer 120 can be restricted by the rigid layer 121, the durability of the key stopper 12 can be improved (the first buffer layer 120 is less likely to wear).

[0134] In addition, the key stopper 12 is formed in a linear shape extending in the scale direction (arrow L-R direction). Thus, the swing of a plurality of keys 2 arranged in the scale direction (for example, keys 2 of one octave) is restricted by one key stopper 12. As a result, even when the key stopper 12 is strongly pressed into by a pair of side plates 21, the pressing force can be effectively dispersed by the flexure of the hard layer 121 extending in the scale direction. Therefore, the durability of the key stopper 12 can be improved.

[0135] By improving the durability of the key stopper 12, it is possible to suppress the case where the thickness of the key stopper 12 gradually thins over time. Therefore, it is possible to suppress the case where the terminal position of normal playing gradually becomes deeper. Thus, it is possible to suppress the detection of a normal key press intended to be performed as aftertouch, and therefore, it is possible to distinguish and detect normal playing and aftertouch with good accuracy.

[0136] As described above, in the present embodiment, it is configured to detect not only aftertouch but also key press information during normal playing until contact with the key stopper 12 based on the output value of the coil 100. That is, it is configured to detect normal playing and aftertouch with one sensor. Therefore, in such a structure, it is particularly preferable to use the key stopper 12 including the respective layers 120 to 122 to restrict the displacement of the white key 2a. Thus, it is possible to distinguish and detect normal playing and aftertouch with good accuracy.

[0137] However, in a keyboard device in which a sensor (keyboard switch 4) for detecting key press information during normal playing and a sensor (pressure sensor 5) for detecting aftertouch are independent sensors as in the prior art (for example, Japanese Patent Laid-Open No. 08-234751), the swing of the key can also be restricted by the key stopper 12 of the present embodiment.

[0138] Here, when aiming at the case where only the hard layer 121 gives the full stroke feeling of normal playing and the white key 2a is largely displaced by the deformation of the first buffer layer 120 during aftertouch playing, for example, the second buffer layer 122 can also be omitted. However, if the white key 2a comes into contact with the relatively hard (for example, PET-made) hard layer 121, noise caused by the contact is likely to occur.

[0139] Therefore, it is preferable to laminate the second buffer layer 122, which is softer than the hard layer 121, on the surface layer side of the hard layer 121 as in the present embodiment. Thus, the impact when the pair of side plates 21 come into contact with the key stopper 12 can be absorbed by the second buffer layer 122, and therefore, the noise generated when they come into contact can be reduced.

[0140] On the other hand, the first buffer layer 120 is softer than the second buffer layer 122. Thus, the noise generated when the white key 2a (side plate 21) contacts the key-touch stopper 12 can be reduced by the second buffer layer 122, and at the same time, the white key 2a can be greatly displaced by the deformation of the first buffer layer 120 during post-touch performance.

[0141] The thickness of the first buffer layer 120 is 1.5 mm or more and 8.0 mm or less, and the thickness of the hard layer 121 is 0.1 mm or more and 0.5 mm or less. In addition, the thickness of the second buffer layer 122 is 1.0 mm or more and 3.0 mm or less.

[0142] That is, since the thickness of the hard layer 121 is thinner than that of the first buffer layer 120, the full stroke feeling of normal performance can be imparted by the hard layer 121, and at the same time, the white key 2a can be greatly displaced by the deformation of the first buffer layer 120 during post-touch performance.

[0143] In addition, the thickness of the second buffer layer 122 is thicker than that of the hard layer 121 and thinner than that of the first buffer layer 120. Thus, the situation of imparting the full stroke feeling of normal performance by the hard layer 121 and the situation of reducing the noise when the white key 2a (side plate 21) contacts the second buffer layer 122 can be achieved, and at the same time, the white key 2a can be greatly displaced by the deformation of the first buffer layer 120 during post-touch performance.

[0144] A stopper portion 28 for restricting the swing of the white key 2a when leaving the key is integrally formed on the side plate 21 of the white key 2a. The stopper portion 28 extends downward from the side plate 21, and a bent portion 28a that bends toward the rear side (near the front side in the direction perpendicular to the paper surface of FIGS. 9(a) and 9(b)) is formed at the lower end of the stopper portion 28.

[0145] The bent portion 28a passes through a through hole 46 formed in the front foot portion 40 of the chassis 4 (refer to Figure 5 ) and is hooked on the lower surface of the support portion 41. A key-leaving stopper 13 that faces the bent portion 28a up and down is bonded to the lower surface of the support portion 41 of the chassis 4.

[0146] The key-leaving stopper 13 is laminated with a first buffer layer 130, a hard layer 131, and a second buffer layer 132 in this order from the side of the support portion 41 of the chassis 4. Each of the layers 130 to 132 has the same structure as each of the layers 120 to 122 of the key-touch stopper 12.

[0147] Therefore, although the illustration is omitted, even when the key-off stopper 13 is pressed into the pair of stoppers 28 by the bent portion 28a of the pair of stoppers 28 when the white key 2a is released, the first buffer layer 130 is compressed as a whole by the relatively hard hard layer 131 (the pressing force of the white key 2a is dispersed by the hard layer 131). Therefore, the pressure applied to the first buffer layer 130 can be reduced. That is, since the deformation in which the pair of bent portions 28a sink into the first buffer layer 130 can be restricted by the hard layer 131, the durability of the key-off stopper 13 can be improved.

[0148] In addition, the key-off stopper 13 is formed in a linear shape extending in the scale direction, so that the swing of the plurality of keys 2 arranged in the scale direction (for example, the keys 2 of one octave) when released is restricted by one key-off stopper 13. Thus, the pressing force caused by the pair of bent portions 28a can be effectively dispersed by the flexure of the hard layer 131 extending in the scale direction. Therefore, the durability of the key-off stopper 13 can be improved.

[0149] By improving the durability of the key-off stopper 13, the situation where the thickness of the key-off stopper 13 gradually thins over time can be suppressed. Therefore, the situation where the height of the white key 2a at the initial position before key touch gradually increases can be suppressed. Therefore, the deviation in the height of each key 2 arranged at the initial position can be suppressed, and thus the appearance of the keyboard device 1 can be improved.

[0150] In addition, by keeping the height of the white key 2a at the initial position before key touch constant, the situation where the engagement position of the guide pin 73 (refer to the enlarged portion of Figure 1 with the groove 80 deviates from the design value can be suppressed. Therefore, the key touch information of the white key 2a can be detected with good accuracy based on the displacement of the displacement member 8 (the change in the sensor output value).

[0151] In this way, by restricting the swing of the white key 2a using the stoppers 12 and 13 having a laminated structure, it is difficult for the initial position of the white key 2a before key touch or the terminal position (the height of the white key 2a) during normal playing to change over time. However, it is difficult to completely avoid the occurrence of such changes over time in the initial position or terminal position of the white key 2a.

[0152] In contrast, in the present embodiment, the sensor output values at the initial position before key touch, the terminal position during normal playing, and the terminal position after key touch of the white key 2a are corrected (calibrated), and the key touch information during normal playing or after key touch is detected based on the corrected values.

[0153] Specifically, regarding the initial position before key touch, in the case where it can be determined based on the temporal change of the sensor output value that the height (sensor output value) of the white key 2a is higher than the first threshold and the white key 2a is in a stationary state (a state higher than the first threshold), it is corrected in such a way that the height (sensor output value) of the white key 2a is determined as the initial position before key touch. In addition, the case where it can be determined based on the temporal change of the sensor output value that the white key 2a is in a stationary state can be exemplified by the case where the stationary state of the white key 2a continues for a certain period of time.

[0154] In addition, regarding the terminal position of normal playing, the upward acceleration (deceleration) generated when the white key 2a contacts the key touch stopper 12 is detected based on the temporal change of the sensor output value, and it is corrected in such a way that the position of the white key 2a where the upward acceleration is generated (the sensor output value at that position) is determined as the terminal position of normal playing.

[0155] In addition, regarding the terminal position after key touch, it is corrected in such a way that the position of the white key 2a (the sensor output value at that position) when the height (sensor output value) of the white key 2a becomes the lowest is determined as the terminal position after key touch.

[0156] By performing such correction, normal playing and aftertouch can be distinguished and detected with good accuracy. In addition, the correction of the sensor output value at each of the above positions can be automatically performed during the player's performance, or can be performed when the player starts the correction mode.

[0157] In addition, regarding the correction (calibration) of the sensor output value at each position of the white key 2a, the correction method in the case where the sensor output value decreases when touching the key (as the stroke amount of the white key 2a increases) has been described, but the same correction can also be performed when the sensor output value increases when touching the key. For example, in the case where the sensor output value increases when touching the key, it can be corrected as follows: when it can be determined based on the temporal change of the sensor output value that the sensor output value is in a state lower than the first threshold, the output value of the sensor is determined as the initial position before key touch. In addition, it can be corrected in such a way that the value when the sensor output value becomes the highest is determined as the terminal position after key touch.

[0158] Next, with reference to Figure 10 FIG. 11(a) and FIG. 11(b), the keyboard device 201 of the second embodiment will be described. In the first embodiment, the case where the detection portion 82 is formed on the shift member 8 linked to the white key 2a has been described, but in the second embodiment, the case where the detection portion 82 is formed on the hammer 214 linked to the white key 202a will be described. In addition, the same parts as those in the first embodiment are denoted by the same reference numerals and their description is omitted.

[0159] Figure 10 is a cross-sectional view of the keyboard device 201 in the second embodiment. FIG. 11(a) is a Figure 10 partial enlarged cross-sectional view of the keyboard device 201 with the XIa part enlarged, and FIG. 11(b) is a partial enlarged cross-sectional view of the keyboard device 201 showing the state where the white key 202a is pressed from the state of FIG. 11(a) to the final position after being pressed.

[0160] As Figure 10 shown, the keyboard device 201 includes a plurality of (88 in this embodiment) keys 202 and is a device that constitutes a keyboard instrument (digital piano). The keys 202 are composed of white keys 202a and black keys 202b, and the plurality of white keys 202a and black keys 202b are arranged in the scale direction (arrow L-R direction).

[0161] On the upper surface of the bottom plate 3, a resin chassis 204 is supported via a channel member 215. A rotation shaft 247 of the key 202 is provided on the upper surface of the rear end side (the end on the arrow B side) of the chassis 204, and the rear end portions of the respective keys 202 are supported by the rotation shaft 247 in a swingable manner.

[0162] At a substantially central portion in the front-rear direction (arrow F-B direction) of the chassis 204, a hammer 214 is pivotally supported so as to be rotatable about a rotation shaft 248 along the scale direction. The hammer 214 includes a mass portion 214a (mass body) for imparting a key touch feeling when the white key 2a is keyed, and the mass portion 214a is located on the rear side (arrow B side) with respect to the rotation shaft 248.

[0163] A portion of the hammer 214 on the front side (arrow F side) with respect to the rotation shaft 248 is configured as an opposing portion 214b that opposes the substrate 10 when the white key 202a is keyed. A receiving portion 214c that is recessed downward is formed on the upper surface of the opposing portion 214b, and the protrusion 229 of the white key 2a is inserted into the receiving portion 214c.

[0164] The protrusion 229 protrudes downward from the lower surface of the substantially central portion in the front-rear direction of the upper plate 20 of the white key 202a, and the bottom surface of the receiving portion 214c is configured as a sliding surface for the tip (lower end) of the protrusion 229 to slide back and forth.

[0165] As shown in FIGS. 11(a) and 11(b), when the white key 202a is depressed, the protrusion 229 slides along the bottom surface of the receiving portion 214c of the hammer 214, and at the same time, the opposing portion 214b is pressed downward by the protrusion 229. Thus, the hammer 214 rotates about the rotation axis 248 (in the clockwise direction in FIGS. 11(a) and 11(b)). Due to the rotation of the hammer 214, the opposing portion 214b of the hammer 214 is displaced relative to the substrate 10. In the following description, the outer surface of the hammer 214 in the direction orthogonal to the axial direction (scale direction) of the rotation axis 248 will be described as the "outer peripheral surface".

[0166] On the outer peripheral surface of the opposing portion 214b of the hammer 214, a detected portion 82 identical to that of the first embodiment is formed by bonding a metal plate such as a non-magnetic metal (copper, etc.) or by performing electroplating.

[0167] As the stroke amount of the white key 202a increases from the initial position before key depression, the intrusion amount of the detected portion 82 into the detection region increases. On the other hand, when the white key 202a is released after being depressed, the hammer 214 rotates in a manner to return to the initial position (in the counterclockwise direction in FIGS. 11(a) and 11(b)) due to the weight of the mass portion 214a. Due to the rotation of the hammer 214, the intrusion amount of the detected portion 82 relative to the detection region decreases. Thus, the inductance of the coil 100 (sensor output value) changes, and the key depression information is detected based on the change.

[0168] The detected portion 82 is formed with a curved surface portion 82a on the front side in the rotation direction of the hammer 214 at the time of key depression, and a flat surface portion 82b connected to the rear side of the curved surface portion 82a in the rotation direction. The curved surface portion 82a is formed in a curved shape protruding in a direction away from the rotation axis 248 of the hammer 214, and the flat surface portion 82b is formed in a planar shape extending along the tangent direction of the rear end (the end on the arrow F side) of the curved surface portion 82a.

[0169] Thus, in the present embodiment, the curvature of the flat surface portion 82b is also smaller than that of the curved surface portion 82a of the detected portion 82. Therefore, the distance between the coil 100 and the detected portion 82 (flat surface portion 82b) in the post-touch playing area can be reduced. As a result, the dynamic range can be expanded, and thus the sensor output value can be significantly reduced in the post-touch playing area.

[0170] As Figure 10 shown, the swing when the white key 202a is depressed is restricted by the key depression stopper 12a in contact with the lower surface of the white key 202a, or the key depression stopper 12b in contact with the mass portion 214a of the hammer 214.

[0171] Although not shown in the drawings, each of the stoppers 12a and 12b is laminated with the same layers 120 to 122 as the key touch stopper 12 of the first embodiment (see FIGS. 9(a) and 9(b)). Thus, during normal playing, a relatively hard full-stroke feeling can be imparted by the hard layer 121 (see FIGS. 9(a) and 9(b)), and during aftertouch playing, the white key 202a can be greatly displaced by the deformation of the first buffer layer 120. Thus, normal playing and aftertouch can be accurately distinguished and detected.

[0172] In addition, the stopper portion 228 extends downward from the side plate 21 of the white key 202a, and the bent portion 228a bends forward (arrow F side) from the lower end of the stopper portion 228. By the key-off stopper 13 mounted on the chassis 204 coming into contact with the bent portion 228a, the swing of the white key 202a during key-off is restricted.

[0173] Although not shown in the drawings, the key-off stopper 13 is also laminated with the same layers 130 to 132 as the key-off stopper 13 of the first embodiment (see FIGS. 9(a) and 9(b)). Thus, the deformation in which the bent portion 228a sinks into the first buffer layer 130 during key-off of the white key 202a can be restricted by the hard layer 131. Thus, the durability of the key-off stopper 13 can be improved.

[0174] As described above, the present invention has been described based on the above embodiments. However, it can be easily inferred that the present invention is not limited to any of the above embodiments, but various modifications and variations can be made without departing from the gist of the present invention.

[0175] In each of the above embodiments, the detection of normal playing and aftertouch is described based on the output value of the coil 100, but it is not necessarily limited to this. For example, a sensor for detecting normal playing and a sensor for detecting aftertouch can be independently provided, or it can be configured not to detect aftertouch.

[0176] In each of the above embodiments, as an example of the material of the detected portion 82 that changes the magnetic field of the coil 100, a non-magnetic metal (such as copper) is exemplified. However, the material of the detected portion 82 can also be a magnetic metal, and as long as it has conductivity, it can also be a material other than metal. As materials other than metal, conductive polymers (conductive rubber or conductive resin), carbon, graphite, etc. can be exemplified. That is, as long as the detected portion 82 has the property of generating eddy currents according to the change of the magnetic field, its material is not limited.

[0177] In the above-mentioned embodiments, the coil 100 is illustrated as an example of a sensor for detecting the touch information (normal performance or aftertouch) of the white key 2a and the white key 202a, but the present invention is not necessarily limited to this. For example, a sensor for detecting the touch information by the change of electrostatic capacitance may be used, and other known non-contact sensors (for example, sensors described in Japanese Patent Laid-Open No. 03-048295) or contact sensors (for example, pressure sensors described in Japanese Patent Laid-Open No. 08-234751) may be used to detect the touch information.

[0178] In the above-mentioned embodiments, the case where the detected portion 82 is formed in the displacement member 8 or the hammer 214 that rotates in conjunction with the swing of the key 2 or the key 202 is described, but the present invention is not necessarily limited to this. For example, the detected portion 82 may be formed in a displacement member that is linearly displaced in conjunction with the swing of the key 2 or the key 202. As such a displacement member that is linearly displaced, the displacement member 307 described in FIG. 15 and FIG. 16 of PCT / JP2022 / 032673 can be exemplified.

[0179] In the above-mentioned embodiments, the case where the detected portion 82 is formed by the curved portion 82a formed in an arc shape (curved shape protruding in the direction away from the rotating axis 90 and the rotating axis 248) with the rotating axis 90 and the rotating axis 248 as the center, and the flat surface portion 82b extending in the tangent direction of the rear end of the curved portion 82a is described, but it is not necessarily limited to this. For example, the curved portion 82a may be omitted and the entire detected portion 82 may be formed in a flat shape, and the flat surface portion 82b may be omitted and the detected portion 82 may be formed in a single arc shape. In addition, the flat surface portion 82b may be a curved surface with a smaller curvature than the curved portion 82a.

[0180] In the above-mentioned embodiments, the situation in which the plane portion 82b and the coil 100 (substrate 10) are substantially parallel to each other in the playing area (terminal position) after touching the key is described, but in the above-mentioned area (terminal position of touching the key), the plane portion 82b and the coil 100 (substrate 10) may also be non-parallel.

[0181] In the above-mentioned embodiments, the touch stopper 12, the touch stopper 12a is in contact with the lower surface of the white key 2a, the white key 202a, and the touch stopper 12b is in contact with the hammer 214. However, the arrangement of the touch stopper 12, the touch stopper 12a, the touch stopper 12b can be set appropriately. Therefore, for example, the displacement of the white key 2a, the white key 202a can be restricted by making the touch stopper 12, the touch stopper 12a contact the lower surface of the stopper 28, the stopper 228 (bending portion 28a, bending portion 228a).

[0182] In each of the above-described embodiments, the case where the shift of the white keys 2a and 202a during key pressing is restricted by the key pressing stopper 12 including the first buffer layer 120, the hard layer 121, and the second buffer layer 122 has been described, but it is not necessarily limited thereto. For example, some of the layers 120 to 122 may be omitted, and additional layers may be added on the basis of the layers 120 to 122. As an example of the structure of adding additional layers, a structure in which felt is added between the first buffer layer 120 and the support portion 41 of the chassis 4 can be exemplified.

[0183] In each of the above-described embodiments, the case where the first buffer layer 120 is made of foamed urethane, the hard layer 121 is made of PET, and the second buffer layer 122 is made of felt has been described, but it is not necessarily limited thereto. Other elastic materials such as resins such as rubber and elastomers (synthetic resins) or foamed materials using these resins may also be used to form the layers 120 to 122. That is, the materials of the layers 120 to 122 can be appropriately changed. For example, as long as the hardness of the layers 120 to 122 is measured using a durometer type A durometer according to Japanese Industrial Standards (JIS) K6253-3:2012, a structure in which the hardness of the hard layer 121 (second buffer layer 122) is higher than that of the first buffer layer 120, or a structure in which the hardness of the second buffer layer 122 is lower than that of the hard layer 121 is sufficient.

[0184] In each of the above-described embodiments, the case where the swing of a plurality of keys 2 and 202 arranged in the scale direction (for example, the keys 2 and 202 of one octave) is restricted by one key pressing stopper 12, 12a, 12b or key release stopper 13 has been described, but it is not necessarily limited thereto. For example, a key pressing stopper 12 or a key release stopper 13 may be provided for each of the keys 2 and 202.

[0185] In each of the above-described embodiments, the case where the thickness of the hard layer 121 is thinner than the thickness of the first buffer layer 120, or the case where the thickness of the second buffer layer 122 is thicker than the hard layer 121 and thinner than the first buffer layer 120 has been described, but it is not necessarily limited thereto. For example, the thickness of the hard layer 121 may also be thicker than the first buffer layer 120. In addition, the thickness of the second buffer layer 122 may also be thinner than the hard layer 121 and thicker than the first buffer layer 120.

[0186] In the first embodiment, it has been described that the substrate 10 is mounted on the holder 9 and the substrate 10 is (indirectly) supported on the chassis 4 via the holder 9, but it is not necessarily limited to this. It may also be configured such that the substrate 10 is mounted on the chassis 4 (the substrate 10 is directly supported on the chassis 4). That is, the so-called "substrate 10 supported on the chassis 4 (support member)" is a concept that includes both the case where the substrate 10 is indirectly mounted on the chassis 4 and the case where the substrate 10 is directly mounted on the chassis 4. However, the substrate 10 may also be supported on the base plate 3, and the support position of the substrate 10 can be appropriately changed.

[0187] In the first embodiment, it has been described that one end (front end) of the substrate 10 is inserted into the protrusions 96 and 97 of the holder 9, and on the other hand, the other end (rear end) of the substrate 10 is screwed to the fixing portion 112 of the fixing member 11, but it is not necessarily limited to this. For example, one end of the substrate 10 may be screwed to the holder 9, or one end of the substrate 10 may be hooked on an elastic claw formed on the holder 9. In addition, a pair of protrusions identical to the protrusions 96 and 97 may be formed on the fixing member 11 and the other end of the substrate 10 may be inserted into the pair of protrusions, or the other end of the substrate 10 may be hooked on an elastic claw formed on the fixing member 11.

[0188] In the first embodiment, it has been described that the key shaft member 5, the holder 9, and the fixing member 11 are different parts, but a part or all of these parts may also be formed integrally.

[0189] In the first embodiment, it has been described that a plurality of key shaft members 5, holders 9, and fixing members 11 are arranged in the scale direction, but it is not necessarily limited to this. For example, it may also be configured such that all the key 2 shafts arranged in the scale direction are supported by one key shaft member 5, or all the shift members 8 shafts arranged in the above direction are supported by one holder 9. In addition, it may also be configured such that the substrate 10 is supported by one fixing member 11.

[0190] In the first embodiment, it has been described that a guide pin 73 is formed on the linkage member 7 mounted on the white key 2a, and on the other hand, a groove 80 that engages with the guide pin 73 is formed on the shift member 8, but a groove may also be formed on the linkage member 7 and a guide pin that engages with the groove may be formed on the shift member 8 on the other hand. In addition, the linkage member 7 (guide pin 73) and the white key 2a may also be integrally formed.

[0191] In the first embodiment, a part of the retainer 9 (the wall portion 91, the mounted portion 92, and the connecting portion 95) located on the displacement locus of the displacement member 8 is described as functioning as a restricting member that restricts the contact between the detected portion 82 (the flat portion 82b) and the coil 100. However, this is not necessarily the case. For example, a portion that restricts the displacement of the displacement member 8 may be provided on the chassis 4 (the support portion 41) or other parts supported by the chassis 4.

[0192] In the first embodiment, the case where the white key 2a and the retainer 9 are assembled on the same chassis 4 (the support portion 41) is described. However, the white key 2a and the retainer 9 may be assembled on different parts.

Claims

1. A keyboard device, characterized in that: include: Multiple keys, arranged along the scale; A displacement member rotates in conjunction with the swing of the key; a detected portion is provided on the outer peripheral surface of the displacement member and has conductivity; and a coil faces the detected portion and generates a magnetic field. The detected portion at least includes: a first detected portion, which is located at the front side in the rotation direction of the displacement member and has a curved surface; and a second detected portion connected to a rear side of the first detected portion in the rotation direction and having a smaller curvature than the first detected portion.

2. The keyboard device according to claim 1, characterized in that: The detected portion has a property of generating an eddy current according to a change in a magnetic field.

3. The keyboard device according to claim 1, characterized in that: The detected portion is made of metal.

4. The keyboard device according to claim 1, characterized in that: A touch key stopper is included, wherein the touch key stopper limits the swing of the key when the key is touched, The coil detects displacement of the key when the key is further pressed after the key comes into contact with the touch stopper as a touch back.

5. The keyboard device according to claim 1, characterized in that: The second detected portion is formed in a planar shape.

6. The keyboard device according to claim 5, characterized in that: In the performance area of ​​aftertouch, the second detected portion faces the coil substantially in parallel.

7. The keyboard device according to claim 5, characterized in that: In an initial position before a key is touched, the first detected portion faces the coil.

8. The keyboard device according to claim 1, characterized in that: One of the key and the displacement member includes a guide pin protruding in the scale direction, and the other of the key and the displacement member includes a groove into which the guide pin is slidably inserted. The keyboard device includes a restriction member that restricts contact between the second detected portion and the coil by restricting displacement of the displacement member when the guide pin is removed from the groove.

9. A method for detecting key touch information is a method for detecting key touch information of a key in a keyboard device, the keyboard device comprising: A plurality of the keys are arranged along the scale direction; A displacement member rotates in conjunction with the swing of the key; a detected portion is provided on the outer peripheral surface of the displacement member and has conductivity; and a coil is opposite to the detected portion and generates a magnetic field. The method for detecting key touch information is characterized in that: The key touch information of the key is detected by relatively displacing the detected portion with respect to the coil, wherein the detected portion includes at least: a first detected portion located at the front side in the rotation direction of the displacement member and having a curved surface; and a second detected portion connected to a rear side of the first detected portion in the rotation direction and having a smaller curvature than the first detected portion.

10. The method for detecting key touch information according to claim 9, characterized in that: The detected portion has a property of generating an eddy current according to a change in a magnetic field.

11. The method for detecting key touch information according to claim 9, characterized in that: The detected portion is made of metal.

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