Keyboard device and key information detection method

Abstract

Since the front surface 73 of the displacement member 7 is covered with a front surface section 81 that is bent from the facing section 80 of the section 8 to be detected, the vertical width of the front surface section 81 can be ensured to be wide even if the thickness of the section 8 to be detected is reduced. By ensuring the vertical width of the front surface part 81 to be wide, the concentration of magnetic lines of force can be dispersed, so that the sensor output overshoot can be suppressed. Namely, since a thick metal plate is not used and overshoot of sensor output can be suppressed, an increase in weight or cost of the keyboard device (1) can be suppressed, and key information can be detected with good precision.

Description

Technical Field

[0001] The present invention relates to a keyboard device and a method for detecting key information, and more particularly to a keyboard device and a method for detecting key information which can suppress weight increase or cost increase and can detect key information with good accuracy. Background Art

[0002] There is a known technology for detecting the depth or speed of a key when it is pressed (hereinafter referred to as "key information") using a non-contact sensor. For example, Patent Document 1 describes a technology in which a coil 57 that generates a magnetic field by flowing current is formed on a substrate 56, and a metal plate 55 (conductor) facing the coil 57 is fixed to the key 41. According to the technology, 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 when the key is pressed, so the key information can be detected based on the change in the current.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Laid-Open No. 03-048295 (for example, page 9, upper left column, lines 7 to 18, Figure 29) Summary of the invention

[0006] Problems to be solved by the invention

[0007] In the prior art, since the metal plate 55 is formed relatively thick, there is a problem that the weight or cost increases. With respect to the above problem, if the metal plate 55 is simply formed thin, the magnetic flux is likely to be concentrated at the end of the metal plate 55 (the lower end of FIG. 29 of Patent Document 1). Due to the concentration of the magnetic flux, the output value of the sensor becomes unstable, and thus there is a problem that the key information cannot be detected with good accuracy.

[0008] 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 information that can suppress an increase in weight or cost and can detect key information with high accuracy.

[0009] Technical means of solving problems

[0010] In order to achieve the above-mentioned purpose, the keyboard device of the present invention includes: a coil that generates a magnetic field; a displacement member that displaces to a position facing the coil when a key is pressed; and a conductor that is arranged on the displacement member, the conductor including: a facing portion that faces the coil when a key is pressed and covers the outer surface of the displacement member; and a front surface portion that is connected to the facing portion and covers the outer surface of the displacement member facing the front side of the displacement direction.

[0011] The method for detecting key information of a keyboard device of the present invention is a method for detecting key information of a keyboard device, the keyboard device comprising: a coil that generates a magnetic field; a displacement member that displaces to a position facing the coil when a key is pressed; and a conductor that is arranged on the displacement member, the conductor comprising: a facing portion that faces the coil when a key is pressed and covers the outer surface of the displacement member; and a front surface portion that is connected to the facing portion and covers the outer surface of the displacement member facing the front side of the displacement direction. The method for detecting key information detects the key information of the key by utilizing the displacement of the displacement member to cause the conductor to displace relative to the coil. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] [ Figure 1 ] is a cross-sectional view of the keyboard device of the first embodiment.

[0013] [ Figure 2 (a) Yes Figure 1 (b) is a partially enlarged cross-sectional view of the keyboard device of part IIa of Figure 2 (a) is a partially enlarged cross-sectional view of the keyboard device taken along line IIb-IIb.

[0014] [ Figure 3 ](a) means from Figure 2 (a) is a partially enlarged cross-sectional view of a keyboard device in a state where a white key is pressed, and (b) is a cross-sectional view showing a state where a white key is pressed. Figure 3 (a) is a partially enlarged cross-sectional view of the keyboard device in a state where a white key is pressed to the end position.

[0015] [ Figure 4 ](a) is a graph showing the relationship between the key stroke and the sensor output, and (b) is a graph showing the relationship between the key stroke and the sensor output. Figure 3 (a) is a partially enlarged cross-sectional view of the keyboard device after the IVb part is enlarged, and (c) is Figure 4 (b) is a partially enlarged cross-sectional view of the keyboard device taken along line IVc-IVc.

[0016] [ Figure 5](a) is a schematic diagram of the magnetic field (magnetic lines of force) when a thin detection portion is formed only on the bottom surface of the displacement member, and (b) is a schematic diagram of the magnetic field (magnetic lines of force) when the detection portion is formed on the bottom surface and front surface of the displacement member.

[0017] [ Figure 6 ] is an exploded perspective view of the keyboard device.

[0018] [ Figure 7 ](a) is a partially enlarged front view of the retainer, (b) is Figure 7 (a) is a partially enlarged top view of the retainer when viewed in the direction of arrow VIIb, and (c) is a front view of the retainer showing a state in which the retainer is bent.

[0019] [ Figure 8 ](a) is a stereoscopic view showing a state in which the shaft portion of the retainer is slid along the guide groove, and (b) is a stereoscopic view showing a state in which the retainer equipped with the displacement member is fixed to the substrate.

[0020] [ Fig. 9 ](a) is a side view of a displacement member of a first modified example, and (b) is a graph showing the relationship between the stroke amount of a key and the sensor output when the displacement member of the first modified example is used.

[0021] [ Fig.10 ](a) is a side view of a displacement member of a second modified example, and (b) is a graph showing the relationship between the stroke amount of a key and the sensor output when the displacement member of the second modified example is used.

[0022] [ Fig.11 ] is a cross-sectional view of the keyboard device of the second embodiment.

[0023] [ Fig.12 ] is an exploded perspective view of the keyboard device.

[0024] [ Fig.13 ](a) is a partially enlarged cross-sectional view of the keyboard device showing the state in which the shaft portion of the retainer is to be inserted into the insertion hole of the white key, and (b) is a partially enlarged cross-sectional view of the keyboard device showing the state after the shaft portion of the retainer is inserted into the insertion hole of the white key.

[0025] [ Fig.14 (a) is to Fig.11 (b) is a partial enlarged cross-sectional view of the keyboard device after the XIVa part is enlarged, and (b) is a partial enlarged cross-sectional view of the keyboard device after the XIVa part is enlarged. Fig.14 (a) is a partially enlarged cross-sectional view of the keyboard device in a state where a white key is pressed to the end position.

[0026] [ Fig.15 ] (a) is a partially enlarged cross-sectional view of a keyboard device according to a third embodiment, and (b) is Fig.15(a) is a partially enlarged cross-sectional view of the keyboard device taken along line XVb-XVb.

[0027] [ Fig.16 ](a) means from Fig.15 (a) is a partially enlarged cross-sectional view of a keyboard device in a state where a white key is pressed, and (b) is a cross-sectional view showing a state where a white key is pressed. Fig.16 (a) is a partially enlarged cross-sectional view of the keyboard device in a state where a white key is pressed to the end position. DETAILED DESCRIPTION

[0028] Hereinafter, preferred embodiments will be described with reference to the accompanying drawings. Figure 1 , the overall structure of the keyboard device 1 according to the first embodiment will be described. Figure 1 It is a cross-sectional view of the keyboard device 1 according to the first embodiment.

[0029] In addition, Figure 1 , a cross section obtained by cutting the keyboard device 1 along a plane perpendicular to the scale direction (the arrangement direction of the plurality of keys 2) is shown. Figure 1 The left side of the keyboard device 1 is recorded as the front side of the keyboard device 1, and the opposite side ( Figure 1 The right side of the key 2 is recorded as the rear side, and the arrangement direction of the plurality of keys 2 ( Figure 1 The vertical direction of the paper surface) is recorded as the scale direction for explanation. Figure 1 In the figure, the protrusion 64 of the hammer 6 is shown by a dotted line (in Figure 2 and the same applies thereafter).

[0030] like Figure 1 As shown, the keyboard device 1 is a keyboard musical instrument (electronic piano) including a plurality of (88 in this embodiment) keys 2. The keys 2 include a plurality of (52 in this embodiment) white keys 2a for playing natural sounds and a plurality of (36 in this embodiment) black keys 2b for playing altered sounds. These plurality of white keys 2a and black keys 2b are arranged in the scale direction ( Figure 1 The plurality of sheets of paper are arranged in a vertical direction (in the vertical direction of the paper surface).

[0031] The keyboard device 1 includes a bottom plate 3 for supporting the white keys 2a and the black keys 2b. The bottom plate 3 is formed into a flat plate extending in the scale direction using synthetic resin or steel plate, and a resin chassis 4 is supported on the upper surface of the bottom plate 3. Both front and rear ends of the chassis 4 are fixed to the bottom plate 3 via a channel material 5.

[0032] On the rear end side of the chassis 4 ( Figure 1On the upper surface of the key 2 (right side), a rotation shaft 20 of the key 2 is provided, and the rear end portion of each key 2 is rotatably (swingably) supported on the chassis 4 through the rotation shaft 20. Below the key 2, a hammer 6 and a displacement member 7 that are linked to the rotation of the key 2 are provided.

[0033] The detailed structure of the white key 2a is described below, and the structure is substantially the same in the black key 2b. Therefore, the action and effect produced by the structure of the white key 2a described below are also exerted in the black key 2b in the same manner.

[0034] The hammer 6 is supported at the substantially central portion in the front-rear direction of the chassis 4 so as to be rotatable about a rotation axis 60 along the scale direction. The hammer 6 includes a mass portion 61 (mass body) for providing a key touch when the white key 2a is pressed. The mass portion 61 is located further rearward than the rotation axis 60 ( Figure 1 on the right side of the

[0035] The portion of the hammer 6 that is further forward than the rotation axis 60 is configured as a pressing portion 62 for pressing the displacement member 7 when the white key 2a is pressed. A receiving portion 63 that is recessed downward is formed on the upper surface of the pressing portion 62, and the protrusion 21 of the white key 2a is inserted into the receiving portion 63.

[0036] The protrusion 21 protrudes downward from the lower surface of the substantially central portion in the front-to-back direction of the white key 2a, and the bottom surface of the receiving portion 63 is configured as a sliding surface for the top end (lower end) of the protrusion 21 to slide forward and backward. When the white key 2a is pressed, the protrusion 21 of the white key 2a slides along the bottom surface of the receiving portion 63, and the pressing portion 62 is pressed downward by the protrusion 21, thereby the hammer 6 rotates around the rotation axis 60 ( Figure 1 counterclockwise) rotation.

[0037] As the hammer 6 rotates, the guide pin 65 formed on the protrusion 64 of the hammer 6 slides along the groove 70 of the displacement member 7, thereby rotating the displacement member 7. Figure 2 and Figure 3 The structure for rotating the displacement member 7 will be described in detail.

[0038] Figure 2 (a) Yes Figure 1 A partial enlarged cross-sectional view of the keyboard device 1 of part IIa, Figure 2 (b) Yes Figure 2 (a) is a partially enlarged cross-sectional view of the keyboard device 1 taken along line IIb-IIb. Figure 3 (a) means from Figure 2 (a) is a partially enlarged cross-sectional view of the keyboard device 1 in a state where the white key 2a is pressed, Figure 3 (b) means from Figure 3State (a) is a partially enlarged cross-sectional view of the keyboard device 1 in a state where the white key 2a is pressed to the terminal position.

[0039] The detected portion 8 is a component plated (plated, plated) on the displacement member 7, and the coil 90 is a component printed on the substrate 9. Figure 2 and Figure 3 , cross sections of the detected portion 8 and the coil 90 are schematically shown (the same applies to subsequent figures).

[0040] like Figure 2 As shown, the protrusion 64 protrudes downward from the lower surface of the pressing portion 62, and the guide pin 65 is extended from the side surface of the protrusion 64 (towards Figure 2 The protrusions 64 and the guide pins 65 are formed integrally with the pressing portion 62 of the hammer 6.

[0041] The guide pin 65 is slidably engaged with a groove 70 formed in the displacement member 7, and the displacement member 7 is rotatably supported by a holder 10 fixed to a substrate 9. The substrate 9 is fixed to the chassis 4 below the weight 6, and a coil 90 for detecting the rotation of the displacement member 7 is printed on the substrate 9.

[0042] The holder 10 includes a mounted portion 11 mounted on the upper surface of the substrate 9, a wall portion 12 rising upward from the mounted portion 11, and a substantially cylindrical shaft portion 13 formed on the upper end side of the wall portion 12. Figure 2 A plurality of wall portions 12 are arranged in the mounted portion 11 extending in the left-right direction (b), and the displacement member 7 is rotatably supported in the opposing spaces of the plurality of wall portions 12 .

[0043] In the following description, the side surfaces of the wall portion 12 (the surfaces facing the scale direction) sandwiching the displacement member 7 are described as the inner side surfaces 12a of the wall portion 12, and the side surface opposite to the inner side surfaces 12a is described as the outer side surfaces 12b. The shaft portion 13 protrudes from the inner side surfaces 12a of the wall portion 12 in the scale direction, and the shaft portion 13 is inserted into the insertion hole 71 that penetrates the displacement member 7 in the scale direction.

[0044] The rotation of the displacement member 7 relative to the shaft portion 13 is performed by the relative sliding of the guide pin 65 of the hammer 6 and the groove 70 formed in the displacement member 7. The groove 70 extends from the upper end portion of the displacement member 7 toward the rear side ( Figure 2 The upper and lower surfaces of the groove 70 on which the guide pin 65 slides when the white key 2a is pressed (released) are defined as an upper sliding surface 70a and a lower sliding surface 70b for explanation.

[0045] The guide pin 65 of the hammer 6 is engaged with the sliding surfaces 70a, 70b of the groove 70 in the area between the rotating shaft 60 of the hammer 6 and the shaft portion 13 of the holder 10 (rotating shaft of the displacement member 7). In the initial state before the white key 2a is pressed, the lower sliding surface 70b of the groove 70 extends so as to intersect the displacement trajectory of the guide pin 65 around the rotating shaft 60.

[0046] Therefore, if Figure 3 As shown, when a key is pressed, the protrusion 21 of the white key 2a pushes the pressing portion 62 of the hammer 6 downward, and the guide pin 65 rotates around the rotation axis 60 ( Figure 3 The lower sliding surface 70b is pressed downward by the guide pin 65. As a result, the displacement member 7 rotates around the shaft portion 13 ( Figure 3 clockwise direction of rotation).

[0047] As the displacement member 7 rotates, the detected portion 8 provided on the bottom surface of the displacement member 7 is relatively displaced with respect to the coil 90 of the substrate 9. That is, as the stroke amount of the white key 2a increases from the state before the key is pressed, the intrusion amount of the detected portion 8 into the area facing the coil 90 (hereinafter referred to as the "detection area") increases. The intrusion amount of the detected portion 8 refers to the size of the area facing the detected portion 8 and the coil 90 in the thickness direction of the substrate 9.

[0048] On the other hand, when the white key 2a is released after being pressed (hereinafter referred to as "when the white key 2a is released"), the mass portion 61 of the hammer 6 (see Figure 1 ) weight, the guide pin 65 rotates around the rotation axis 60 ( Figure 3 By the rotation of the guide pin 65, the upper sliding surface 70a is pushed up by the guide pin 65, thereby the displacement member 7 is rotated around the shaft portion 13 ( Figure 3 At this time, the intrusion amount of the detected part 8 relative to the detection area is reduced.

[0049] The detected portion 8 is formed of a non-magnetic metal (copper, etc.). Therefore, when a current is passed through the coil 90 to generate a magnetic field, if the amount of intrusion of the detected portion 8 into the detection area is increased, the inductance of the coil 90 is reduced, and if the amount of intrusion of the detected portion 8 into the detection area is reduced, the inductance of the coil 90 is increased. The sensor output value (V) changes based on the increase or decrease in the inductance of the coil 90 (see Figure 4 ). The key information (note information) is detected based on the increase or decrease of the sensor output value.

[0050] Reference Figure 3 and Figure 4 The sensor output will be described. Figure 4(a) is a graph showing the relationship between the stroke amount of the key 2 and the sensor output, where the vertical axis represents the magnitude of the sensor output (V) and the horizontal axis represents the stroke amount of the key 2 (mm). Figure 4 (b) Figure 3 (a) is a partially enlarged cross-sectional view of the keyboard device 1 after enlarging part IVb, Figure 4 (c) Yes Figure 4 (b) is a partially enlarged cross-sectional view of the keyboard device 1 taken along line IVc-IVc. Figure 4 (b) and Figure 4 In (c), part of the structure is omitted ( Figure 3 The illustration of the holder 10 etc. shown in the figure only shows the main part of the keyboard device 1.

[0051] like Figure 4 As shown in (a), in this embodiment, the sensor output is configured to decrease approximately proportionally with the pressing of the white key 2a. Figure 3 As shown, the lower sliding surface 70b of the groove 70 is formed in an arc shape convex downward, and the stroke amount of the white key 2a when the key is pressed (the rotation amount of the guide pin 65 around the rotation axis 60) is roughly proportional to the rotation amount of the displacement member 7 around the shaft portion 13.

[0052] In addition, the upper sliding surface 70a is also in a shape corresponding to the lower sliding surface 70b (the interval between each sliding surface 70a, 70b is constant), so when the white key 2a is released, the sensor output increases approximately in proportion to the reduction in the stroke of the white key 2a. Based on the increase or decrease in the sensor output, key information such as the depth or speed of pressing the white key 2a is detected. In order to detect the key information with good accuracy, it is necessary to make the gap between the detected portion 8 and the coil 90 in each key 2 a size like the design value.

[0053] In the prior art of detecting key information using such a non-contact sensor, a detected portion is provided on a rotating member such as key 2 or hammer 6 (for example, Japanese Patent Laid-Open No. 03-048295). In such a structure, the gap between coil 90 and detected portion 8 is prone to deviation.

[0054] Regarding the first reason for the occurrence of the above-mentioned deviation, since the size of the key 2 or the hammer 6 itself is large (long in the front-rear direction), there is a problem that the size error of each key 2 or each hammer 6 is easy to occur. In addition, regarding the second reason, since the size of the chassis 4 supporting the key 2 or the hammer 6 is also large, there is a problem that the key 2 or the hammer 6 is easy to cause the installation (assembly) error.

[0055] In contrast, in this embodiment, if Figure 3As shown, the detected portion 8 is not provided on the white key 2a or the hammer 6, but is provided on the displacement member 7 linked to the white key 2a or the hammer 6. The displacement member 7 can be formed smaller than the white key 2a or the hammer 6, so it is difficult for each displacement member 7 to have a dimensional error. In addition, since the displacement member 7 is axially supported by a relatively small holder 10 directly mounted on the substrate 9 instead of the chassis 4, it is also difficult for each displacement member 7 to have an installation error. By reducing these dimensional errors and installation errors, the gap between the coil 90 and the detected portion 8 can easily become a size as designed in each key 2. Therefore, the key information of each key 2 can be detected with good accuracy.

[0056] The details will be described later, but since a plurality of displacement members 7 arranged in the scale direction are supported by a holder 10 (see Figure 6 ), therefore, compared with a case where, for example, a separate retainer 10 is provided for each of a plurality of displacement members 7 (one displacement member 7 is mounted on a substrate 9 using one retainer 10), the gap between the coil 90 and the detection portion 8 is easily made a size similar to the design value in each key 2.

[0057] Furthermore, by fixing the holder 10 extending in the scale direction to the substrate 9, deformation of the substrate 9 can be restricted by the holder 10. Thus, the gap between the coil 90 and the detection portion 8 in each key 2 can be easily adjusted to the designed size.

[0058] In addition, if the guide pin 65 of the hammer 6 is engaged with the groove 70 of the displacement member 7, that is, the displacement member 7 is able to rotate in conjunction with the hammer 6, the shape of the displacement member 7 or the arrangement of the rotation axis (shaft portion 13) can be freely changed. That is, by appropriately setting the shape of the displacement member 7 or the position of the rotation axis, the arrangement of the coil 90 (the arrangement of the coil 90 on the substrate 9 or the arrangement of the substrate 9 itself) can also be changed to a desired position. Therefore, the degree of freedom in the design of the keyboard device 1 is improved.

[0059] Here, as in the third embodiment described later (see Fig.15 , Fig.16 ), even if the displacement member 307 is supported in a slidable manner on the holder 310 fixed to the base plate 9, the dimensional error and mounting error of the displacement member 307 can be reduced. However, in the case of the structure as in the third embodiment, the displacement member 307 may not slide smoothly relative to the holder 310, and the touch feeling when pressing the white key 2a is likely to deteriorate.

[0060] In contrast, in the present embodiment, since the displacement member 7 is rotatably supported by the holder 10, the displacement member 7 can smoothly interlock with the rotation of the hammer 6. Therefore, it is possible to suppress deterioration of the touch when the white key 2a is depressed.

[0061] like Figure 4 As shown in (b), the bottom surface 72 (the surface facing the coil 90) of the displacement member 7 is formed so as to insert the hole 71 (see Figure 3 ) is centered in an arc shape. At the front and rear ends of the bottom surface 72 of the displacement member 7, a front side ( Figure 4 (b) on the left side) of the front surface 73 of the displacement member 7, and on the rear side ( Figure 4 (b) is the rear surface 74 of the displacement member 7. The front surface 73 of the displacement member 7 is a plane extending from the front edge of the bottom surface 72 in the normal direction of the bottom surface 72, and the rear surface 74 is a plane extending from the rear edge of the bottom surface 72 in the normal direction of the bottom surface 72.

[0062] In order to change the magnetic field of the coil 90, the detected portion 8 may be provided only on the bottom surface 72 of the displacement member 7. However, the detected portion 8 of the present embodiment includes: a facing portion 80 covering the entire bottom surface 72 of the displacement member 7 (facing the coil 90), and a front surface portion 81 connected to the front end of the facing portion 80 and covering the front surface 73 of the displacement member 7. This is because, when the detected portion 8 is formed only on the bottom surface 72 of the displacement member 7, as shown in FIG. Figure 4 As shown by the dotted line in (a), in the initial stage of pressing the white key 2a (when the stroke is about 2 mm), a problem occurs in that the output value of the sensor temporarily rises (hereinafter referred to as "sensor output overshoot").

[0063] Reference Figure 5 The overshoot of the sensor output will be described. Figure 5 (a) is a schematic diagram of a magnetic field (magnetic lines of force) when a thin detection portion is formed only on the bottom surface 72 of the displacement member 7. Figure 5 (b) is a schematic diagram of a magnetic field (magnetic lines of force) when the bottom surface 72 and the front surface 73 of the displacement member 7 form the detection portion 8 (the facing portion 80 and the front surface portion 81). Figure 5 , the shape of the magnetic field analyzed using simulation software is schematically illustrated.

[0064] like Figure 5As shown in (a), if the detected portion 8 is formed thin (the detected portion 8 is provided only on the bottom surface 72 of the displacement member 7), when the detected portion 8 begins to intrude into the detection area (a position facing the coil 90 of the substrate 9), the magnetic force lines (magnetic flux) are concentrated at a point at the front edge portion P1 of the detected portion 8. It is considered that since the magnetic force lines are concentrated at the above point, an overshoot of the sensor output occurs.

[0065] On the other hand, Figure 5 As shown in (b), if the front surface portion 81 is provided on the detected portion 8, when the detected portion 8 begins to invade the detection area, the concentration of magnetic lines of force (magnetic flux) is dispersed to the connecting portion P2 of the opposite portion 80 of the detected portion 8 and the front surface portion 81, and the upper edge portion P3 of the front surface portion 81. More specifically, a part (P3) of the point where the magnetic lines of force are concentrated is away from the area with a strong magnetic field near the coil, thereby alleviating the influence on the change of the magnetic field. It is believed that by dispersing the concentration of magnetic lines of force in this way, a magnetic field change can be obtained. Figure 4 The sensor output without overshoot as shown by the solid line in (a). By suppressing the overshoot of the sensor output, the key information can be detected with high accuracy.

[0066] In the above case, even in a structure in which a thick metal plate is used to form the detected portion 8 as in the prior art (e.g., the metal plate 55 shown in FIG. 29 of Japanese Patent Laid-Open No. 03-048295), the upper and lower widths of the front surface of the detected portion 8 can be ensured to be relatively wide, so it is considered that the overshoot of the sensor output can be suppressed. However, if a thick metal plate is used, the weight or cost of the keyboard device 1 will increase.

[0067] In contrast, in this embodiment, if Figure 4 As shown in (b), the front surface 73 of the displacement member 7 is covered by the front surface portion 81 that rises (bends) from the opposing surface portion 80 of the detected portion 8. With this structure, even if the thickness of the detected portion 8 is reduced, the vertical width of the front surface portion 81 can be ensured to be wide. That is, since a thick metal plate as in the prior art is not used and the overshoot of the sensor output can be suppressed, the increase in weight or cost of the keyboard device 1 can be suppressed, and the key information can be detected with good accuracy.

[0068] In addition, in this embodiment, in addition to the front surface 73 of the displacement member 7, a rear surface portion 82 of the detection portion 8 is provided on the rear surface 74 of the displacement member 7. The rear surface portion 82 is connected to the rear end of the facing portion 80 of the detection portion 8 and covers the rear surface 74 of the displacement member 7. Figure 4 As shown in (c), a pair of side portions 83 of the detected portion 8 are provided on the side 75 of the displacement member 7. The side portions 83 are arranged in the scale direction ( Figure 4Both ends of the facing portion 80 in the left-right direction (c) stand upward.

[0069] The reason why the rear surface portion 82 and the side surface portion 83 are formed in addition to the facing surface portion 80 and the front surface portion 81 of the detected portion 8 is that it is easy to form the detected portion 8 on the displacement member 7 by plating. That is, when the detected portion 8 is formed on the displacement member 7 by plating, masking is applied to the displacement member 7 so that the formation area of ​​the detected portion 8 is exposed. By performing metal plating on the displacement member 7 to which the masking is applied, the detected portion 8 is not formed in the masked area (the plating layer is not attached), and the detected portion 8 is formed on the outer surface of the displacement member 7 exposed from the masking.

[0070] When the detection portion 8 is formed by such plating, for example, in a structure in which the detection portion 8 (the facing surface portion 80 and the front surface portion 81) is provided only on the bottom surface 72 and the front surface 73 of the displacement member 7, it is necessary to provide a mask with a step difference on the front surface 73 and the side surface 75 of the displacement member 7. Therefore, the work of providing the mask on the displacement member 7 requires time.

[0071] In contrast, in the present embodiment, since the parts 80 to 83 of the detection part 8 are formed on the bottom surface 72, the front surface 73, the rear surface 74, and the side surface 75 of the displacement member 7, respectively, the above-mentioned masking with a step difference is not required. Therefore, the displacement member 7 can be easily masked.

[0072] Thus, the detected portion 8 of the present embodiment is formed by plating the outer surface of the displacement member 7 with metal, so the thickness of each portion 80 to 83 of the detected portion 8 is substantially constant. Substantially constant thickness means that the minimum and maximum thicknesses of, for example, the front surface portion 81 are within a range of ±30% relative to the average value of the thicknesses of each portion 80 to 83 of the detected portion 8.

[0073] In addition, the vertical width dimensions (standing height from the facing surface 80) of the front surface portion 81, the rear surface portion 82, and the pair of side surface portions 83 of the detection portion 8 are also substantially constant. The vertical width dimensions being substantially constant means that the minimum and maximum vertical width dimensions of the front surface portion 81 are within a range of ±30% relative to the average value of the vertical width dimensions of each portion 80 to 83 of the detection portion 8, for example.

[0074] Thus, the upper and lower width dimensions (standing height from the opposing surface 80) of the front surface 81 of the detected portion 8 are substantially constant, and the upper edge 81a of the front surface 81 of the detected portion 8 is formed along the scale direction ( Figure 4Thus, compared with a case where there is a pointed portion on the upper edge 81a of the front surface portion 81 (for example, the upper edge 81a of the front surface portion 81 is mountain-shaped), the change of the magnetic field can be suppressed from being concentrated on a portion of the upper edge 81a of the front surface portion 81. Therefore, the key information can be detected with good accuracy.

[0075] In addition, the detected portion 8 includes a curved portion 84 that curvedly connects the facing portion 80 and the front surface portion 81. The curved portion 84 smoothly connects the front end of the facing portion 80 and the boundary (corner) portion of the lower end of the front surface portion 81, thereby suppressing the concentration of changes in the magnetic field on the boundary portion. Therefore, the key information can be detected with good accuracy.

[0076] Then, refer to Figures 6 to 8 , a method of mounting the displacement member 7 to the substrate 9 (holder 10) will be described. Figure 6 It is an exploded perspective view of the keyboard device 1 . Figure 7 (a) is a partially enlarged front view of the retainer 10, Figure 7 (b) Yes Figure 7 (a) is a partially enlarged top view of the retainer 10 when viewed in the direction of arrow VIIb, Figure 7 (c) is a front view of the retainer 10 showing a state where the retainer 10 is bent. Figure 8 (a) is a perspective view showing a state in which the shaft portion 13 of the retainer 10 is slid along the guide groove 76. Figure 8 (b) is a perspective view showing a state where the holder 10 to which the displacement member 7 is attached is fixed to the substrate 9 .

[0077] like Figure 6 As shown, on the substrate 9, a plurality of coils 90 are arranged in the scale direction, and on the upper side of each of the coils 90, a plurality of displacement members 7 are axially supported by a holder 10. The displacement members 7 and the holder 10 are mounted on the substrate 9 in the following manner: after the displacement members 7 are mounted on the holder 10, the holder 10 is fixed to the substrate 9.

[0078] like Figure 6 and Figure 7 As shown, the mounted portion 11 of the holder 10 fixed to the upper surface of the substrate 9 includes: a base 11a for the wall portion 12 to stand up, a connecting portion 11b connecting the bases 11a to each other, and a connecting portion 11c (the connecting portion 11c refers to Figure 7 (b)), these parts 11a to 11c are integrally formed using a resin material (synthetic resin).

[0079] The base 11a extends from the lower end of the wall 12 to the front and rear sides, and the front and rear ends of the base 11a are connected in the scale direction by the connecting parts 11b and 11c. Therefore, a rectangular through hole 11d surrounded by the base 11a and the connecting parts 11b and 11c is formed in the mounted portion 11. The through holes 11d are arranged in the scale direction at a configuration interval corresponding to the coil 90 of the substrate 9.

[0080] The mounted portion 11 has a plurality of screw holes 11 e , and the holder 10 is fixed to the substrate 9 by screwing screws (not shown) inserted into the through holes 91 of the substrate 9 into the screw holes 11 e of the mounted portion 11 .

[0081] Since a plurality of displacement members 7 arranged in the scale direction are mounted on the holder 10, in this embodiment, it is possible to easily mount these and prevent the displacement members 7 from falling off after mounting. The above structure will be described below, but the problem of "easy mounting of the rotation member and preventing it from falling off" is also the same in the key 2 or the hammer 6. The support structure of the key 202 that solves the above problem will be described later in the second embodiment ( Figure 11 to Figure 13 ) is described in .

[0082] In the holder 10 of this embodiment, the bases 11a of the mounted parts 11 are connected to each other by the flat connecting parts 11b and 11c. Therefore, before the holder 10 is fixed to the substrate 9, Figure 7 As shown in (c), the mounted portion 11 (connecting portion 11b, connecting portion 11c) can be bent. By bending the mounted portion 11, the distance between the shaft portions 13 formed on the wall portion 12 is slightly expanded, so that Figure 8 As shown in (a), when the displacement member 7 is mounted on the holder 10, the pair of shaft portions 13 can be easily inserted into the insertion holes 71 of the displacement member 7. Therefore, the workability of mounting the displacement member 7 can be improved.

[0083] On the other hand, after the displacement member 7 is mounted on the retainer 10, as shown in FIG. Figure 8 As shown in (b), by fixing the holder 10 to the substrate 9 having a relatively high rigidity (relative to the holder 10), the distance between the shaft portions 13 of the wall portion 12 can be suppressed from expanding (the mounted portion 11 is flexed). Therefore, the shaft portion 13 can be suppressed from being disengaged from the insertion hole 71 of the displacement member 7, and thus the displacement member 7 can be suppressed from falling off from the holder 10.

[0084] like Figure 7 and Figure 8As shown, the thickness of the connecting parts 11b and 11c connecting the base parts 11a is thinner than the thickness of the base part 11a for the wall part 12 to stand. By forming such thin-walled parts between the base parts 11a, it is easy to bend the mounted part 11 in a manner that the facing interval of the wall part 12 (shaft part 13) is enlarged.

[0085] Furthermore, since the through hole 11d is formed between the connecting parts 11b and 11c (between the wall parts 12), the mounted part 11 is also easily flexed. By forming the mounted part 11 to be easily flexed, the pair of shaft parts 13 can be easily inserted into the insertion hole 71 of the displacement member 7.

[0086] Here, the area around the threaded hole 11e of the mounted portion 11 needs to be formed relatively thick because the axial force of the screw acts. Therefore, if the threaded hole 11e is provided on the front side or the rear side of the space facing each other between the wall portions 12 (the area where the connecting portions 11b and 11c are formed), it is easy to prevent the deformation of the mounted portion 11 such as expanding the facing interval between the wall portions 12 (shaft portion 13).

[0087] In contrast, in the present embodiment, since the screw holes 11e are formed at both ends of the base 11a, the thickness of the front side or rear side (the region where the connection portions 11b and 11c are formed) of the space facing each other between the wall portions 12 can be reduced. As a result, the mounted portion 11 can be easily bent so as to expand the facing interval between the wall portions 12 (shaft portions 13), and thus the pair of shaft portions 13 can be easily inserted into the insertion hole 71 of the displacement member 7.

[0088] The insertion of the shaft portion 13 into the insertion hole 71 is guided by the guide grooves 76 formed on the pair of side surfaces 75 of the displacement member 7 (see Figure 8 (a)). The guide groove 76 extends downward from the insertion hole 71 and bends toward the front side, and an open portion 76a of the guide groove 76 is formed at the front end of the displacement member 7. The thickness of the displacement member 7 in the scale direction in the region where the open portion 76a is formed is formed to be thinner than the opposing interval of the pair of shaft portions 13. That is, each guide groove 76 formed on the pair of side surfaces 75 of the displacement member 7 is configured to be able to receive the pair of shaft portions 13 from its open portion 76a.

[0089] In this way, since the guide groove 76 is configured such that one end side is connected to the insertion hole 71 and the shaft portion 13 can be received from the open portion 76a at the other end side, the shaft portion 13 received from the open portion 76a can be guided toward the insertion hole 71 by sliding the shaft portion 13 along the guide groove 76. Therefore, the pair of shaft portions 13 can be easily inserted into the insertion hole 71 of the displacement member 7.

[0090] Here, the surface of the guide groove 76 facing the scale direction (facing the top end of the shaft portion 13) is defined as the groove bottom surface 76b. The groove bottom surface 76b is formed with an inclined surface 76c, which is inclined upward toward the insertion hole 71 in such a manner that the thickness of the displacement member 7 in the scale direction increases. When the shaft portion 13 slides on the inclined surface 76c, the facing interval of the pair of shaft portions 13 is automatically expanded by the elastic deformation of the wall portion 12. Therefore, it is not necessary for the operator to expand the facing interval of the shaft portions 13 with his fingers, so the pair of shaft portions 13 can be easily inserted into the insertion hole 71 of the displacement member 7.

[0091] In the present embodiment, the inclined surface 76c is formed near the insertion hole 71, but, for example, an inclination equivalent to the inclined surface 76c may be provided near the opening portion 76a. That is, the formation position of the inclined surface 76c in the groove 70 may be appropriately set. In addition, the vicinity of the insertion hole 71 refers to a position where the distance from the inclined surface 76c to the insertion hole 71 is closer than the distance from the opening portion 76a to the inclined surface 76c.

[0092] When the shaft portion 13 slides on the inclined surface 76c of the guide groove 76, the inclined surface 14 formed on the shaft portion 13 slides relative to the inclined surface 76c. The inclined surface 14 is inclined upward in a manner that the upper end of the top end surface of the shaft portion 13 is chamfered (away from the facing shaft portion 13). That is, since the inclined surface 14 is inclined in a direction corresponding to the inclined surface 76c of the guide groove 76, when the shaft portion 13 slides along the inclined surface 76c, the inclined surfaces 14 and 76c slide relative to each other. As a result, the shaft portion 13 can slide smoothly relative to the inclined surface 76c, compared with, for example, a case where the inclined surface 14 is not formed on the shaft portion 13. Therefore, the pair of shaft portions 13 can be easily inserted into the insertion hole 71 of the displacement member 7.

[0093] The displacement member 7 is mounted on the holder 10 by inserting the pair of shaft portions 13 into the insertion holes 71. After the displacement member 7 is mounted, by fixing the holder 10 to the substrate 9 as described above, the displacement member 7 can be substantially prevented from falling off due to elastic deformation of the holder 10 (mounted portion 11 or wall portion 12).

[0094] However, although the substrate 9 has relatively high rigidity (compared with the holder 10 ), it may be deformed. Therefore, in order to more reliably prevent the displaceable member 7 from falling off, the holder 10 also needs to have a certain degree of rigidity.

[0095] Therefore, in this embodiment, the holder 10 is provided with a connecting portion 15 that connects the outer side surfaces 12b of the wall portions 12. By providing such a connecting portion 15, the expansion of the facing distance between the wall portions 12 after the holder 10 is attached to the substrate 9 can be restricted by the connecting portion 15. Therefore, the displacement member 7 can be prevented from falling off from the holder 10.

[0096] On the other hand, for example, if the entire outer side surface 12b of the wall portion 12 is connected (from the upper end to the lower end) by the connecting portion 15, when the shaft portion 13 slides on the inclined surface 76c of the guide groove 76, the wall portion 12 is less likely to be elastically deformed. Therefore, in the present embodiment, only the area on the lower end side of the outer side surface 12b of the wall portion 12 is connected by the connecting portion 15. That is, the connecting portion 15 connects the outer side surfaces 12b of the wall portion 12 to each other at the lower side (mounted portion 11 side) of the shaft portion 13, and a gap is formed between the outer side surfaces 12b in the area where the shaft portion 13 is formed (the position overlapping the shaft portion 13 in the scale direction).

[0097] The above-mentioned spacing allows elastic deformation of the wall portion 12 when the shaft portion 13 slides on the inclined surface 76c of the guide groove 76, so that the pair of shaft portions 13 can be easily inserted into the insertion hole 71 of the displacement member 7. In this way, in the up-down direction (the direction in which the wall portion 12 stands up from the base portion 11a), a part of the outer side surface 12b of the wall portion 12 is connected by the connecting portion 15, so that the wall portion 12 can be appropriately elastically deformed. Therefore, the displacement member 7 can be easily mounted on the holder 10, and the displacement member 7 after mounting can be prevented from falling off from the holder 10.

[0098] In addition, in this embodiment, in order to give the holder 10 a certain degree of rigidity, a thick wall portion 11f is formed in the connecting portion 11b that connects the front ends of the base 11a to each other among the connecting portions 11b and the connecting portions 11c. The thick wall portion 11f is a portion formed with the same thickness as the base 11a. The thick wall portion 11f extends from the front end portion of the base 11a in the scale direction, but a notch portion 11g is formed in the center portion of the thick wall portion 11f in the scale direction.

[0099] By providing these thick wall portions 11f or cutout portions 11g, the mounted portion 11 (connecting portion 11b, connecting portion 11c) can be elastically deformed appropriately. Figure 7 (c)), and the mounted portion 11 can be prevented from being elastically deformed after being fixed to the substrate 9. Therefore, the displacement member 7 can be easily mounted to the holder 10, and the displacement member 7 after mounting can be prevented from falling off from the holder 10.

[0100] After the holder 10 with the displacement member 7 mounted thereon is fixed to the substrate 9, the opening 70c of the groove 70 formed from above the wall portion 12 is opened (see Figure 8 ) Insert the guide pin 65 of the hammer 6 (refer to Figure 3 During such assembly work, if the displacement member 7 rotates excessively relative to the retainer 10, the workability will deteriorate, so the displacement member 7 is formed with protrusions 77a and 77b for limiting the rotation.

[0101] The protrusions 77a and 77b are protrusions protruding from the side surface 75 of the displacement member 7 in the scale direction. When the displacement member 7 is mounted on the holder 10, the protrusion 77a is located on the front side of the wall portion 12 (the front side in the rotation direction of the displacement member 7), and the protrusion 77b is located on the rear side of the wall portion 12. Thus, the excessive rotation of the displacement member 7 relative to the holder 10 can be restricted by the contact between the protrusions 77a and 77b and the wall portion 12. Therefore, the workability of the above-mentioned assembly operation can be improved.

[0102] In the present embodiment, the protrusions 77 a and 77 b are formed on the pair of side surfaces 75 of the displacement member 7 , respectively. However, the protrusions 77 a and 77 b may be formed on only one of the pair of side surfaces 75 .

[0103] In addition, the displacement member 7 is provided with a guide portion 78 for stabilizing the rotation of the displacement member 7 relative to the holder 10. The guide portion 78 is a convex portion protruding in the scale direction from each of the pair of side surfaces 75 of the displacement member 7. By providing such a guide portion 78, the rotation of the displacement member 7 around the shaft portion 13 can be guided by the contact between the guide portion 78 and the wall portion 12. As a result, the detected portion 8 can be easily rotated while maintaining a predetermined gap with respect to the coil 90 of the substrate 9, so that the key information can be detected with good accuracy.

[0104] Since the guide portion 78 extends in an arc shape with the insertion hole 71 (the shaft portion 13 serving as the rotation axis of the displacement member 7) as the center, the rotation of the displacement member 7 can be guided by the guide portion 78, and the contact area of ​​the guide portion 78 with respect to the wall portion 12 can be reduced. Therefore, the guide portion 78 can slide relatively to the wall portion 12 smoothly and easily.

[0105] Then, refer to Fig. 9 and Fig.10 , a modification of the displacement member 7 will be described. In the first embodiment, the case where the sensor output decreases substantially in proportion to the stroke amount of the key 2 when the key is pressed has been described.

[0106] In contrast, Fig. 9 and Fig.10 In the modification example, a configuration is described in which, compared with the first embodiment, the degree of decrease in sensor output relative to the stroke amount of the key 2 when the key is pressed is increased or the decrease in sensor output is mitigated.

[0107] Fig. 9 (a) is a side view showing a displacement member 7 according to a first modification example. Fig. 9 (b) is a graph showing the relationship between the stroke amount of the key and the sensor output when the displacement member 7 according to the first modification example is used. Fig.10 (a) is a side view showing a displacement member 7 according to a second modification example. Fig.10 (b) is a graph showing the relationship between the stroke amount of the key and the sensor output when the displacement member 7 of the second modified example is used. Fig. 9 and Fig.10 In FIG. 1 , the sensor output when the displacement member 7 according to the first embodiment is used is shown by a dotted line.

[0108] in addition, Fig. 9 , 10 Each modification example has the same structure as the displacement member 7 of the first embodiment except that the shapes of the groove 70 (upper sliding surface 70a and lower sliding surface 70b) are different. Fig. 9 , Fig.10 In each modification example, the same reference numerals as those in the first embodiment are given for description.

[0109] like Fig. 9 As shown in (a), the groove 70 of the displacement member 7 of the first modified example is a member in which the upper sliding surface 70a and the lower sliding surface 70b are formed into a straight line. That is, the first modified example increases the radius of curvature of each sliding surface 70a, 70b compared with the first embodiment. By setting the shape of the groove 70 in this way, the stroke amount of the displacement member 7 relative to the key 2 (that is, Figure 3 The rotation amount of the guide pin 65 around the rotation axis 60 shown in FIG. 6 is larger than that of the first embodiment. Fig. 9 As shown in (b), the degree of reduction in the sensor output relative to the stroke amount of the key 2 when the key is pressed can be increased compared to the first embodiment.

[0110] like Fig.10 As shown in (a), the groove 70 of the displacement member 7 of the second modified example is a member in which the curvature radius of the upper sliding surface 70a and the lower sliding surface 70b is smaller than that of the first embodiment. By setting the shape of the groove 70 in this way, the rotation amount of the displacement member 7 relative to the stroke amount of the key 2 is smaller than that of the first embodiment. Therefore, according to the displacement member 7 of the second modified example, as shown in FIG. Fig.10 As shown in (b), the reduction degree of the sensor output with respect to the stroke amount of the key 2 when the key is pressed can be mitigated compared with the first embodiment.

[0111] Thus, in the first embodiment or Fig. 9 and Fig.10 In the modified example shown, the displacement member 7 is provided through the guide pin 65 of the hammer 6 (see Figure 3) and the groove 70 to rotate, so the sensor output (that is, the displacement form of the displacement member 7) can be adjusted by changing the shape of the groove 70. That is, by installing the displacement member 7 corresponding to the sensor output required by the user on the keyboard device 1, or replacing the displacement member 7 installed on the keyboard device 1, the sensor output corresponding to the user's request can be obtained.

[0112] When adjusting the sensor output, for example, a structure can be adopted in which the groove 70 is formed on the hammer 6 side and the guide pin 65 is formed on the displacement member 7 side. However, the hammer 6 itself is large in size and expensive. Therefore, if the groove 70 is formed on the hammer 6 side, the cost of replacing the hammer 6 with a different shape of the groove 70 (changing the sensor output) increases.

[0113] In contrast, the displacement member 7 can be made smaller (cheaper) than the weight 6. Therefore, by forming the groove 70 on the displacement member 7 side and the guide pin 65 on the weight 6 side, the cost when replacing the displacement member 7 with a groove 70 having a different shape (changing the sensor output) can be reduced.

[0114] In addition, in the first embodiment or Fig. 9 and Fig.10 In the displacement member 7 shown, the case where the upper sliding surface 70a and the lower sliding surface 70b of the groove 70 are of corresponding shapes (the interval between the sliding surfaces 70a and 70b is constant), that is, the correlation between the stroke amount of the key 2 and the sensor output is the same when the key is pressed and when it is released, but it is not necessarily limited to this.

[0115] For example, the upper sliding surface 70a (see Figure 3 ) is changed to the upper sliding surface 70a of the first modified example (see Fig. 9 That is, the following structure may be adopted: in a part (or the whole) of the area where the guide pin 65 slides, the intervals between the sliding surfaces 70a and 70b are changed, whereby the correlation between the stroke amount of the key 2 and the sensor output is different when the key is pressed and when it is released.

[0116] Then, refer to Figure 11 to Figure 14 , a keyboard device 201 of a second embodiment is described. In the first embodiment, a case where the displacement member 7 is rotatably supported by the holder 10, or a case where the displacement member 7 is rotated by the hammer 6 is described. In contrast, in the second embodiment, a structure where the key 202 is supported by the holder 210 having the same structure as the holder 10, or a case where the displacement member 207 is displaced by the key 202 is described. In addition, the same reference numerals are given to the same parts as those in the first embodiment, and their description is omitted.

[0117] First, refer to Fig.11 , the overall structure of the keyboard device 201 of the second embodiment is described. Fig.11 is a cross-sectional view of a keyboard device 201 according to the second embodiment. Fig.11 , a cross section obtained by cutting with a plane perpendicular to the scale direction of the keyboard device 201 (the arrangement direction of the plurality of keys 2) is illustrated.

[0118] like Fig.11 As shown, the keyboard device 201 of the second embodiment includes a chassis 204 supported by the bottom plate 3. The chassis 204 includes: a pair of legs 240 spaced apart by a predetermined interval in the front-back direction, and a support portion 241 connecting the upper ends of the pair of legs 240 to each other front-back. The legs 240 and the support portion 241 are integrally formed using synthetic resin or steel plate, etc., and a holder 210 is fixed to the upper surface of the support portion 241. The holder 210 rotatably supports a plurality of keys 202 (white keys 202a and black keys 202b) arranged in the scale direction.

[0119] Reference Figures 11 to 13 The structure for supporting the key 2 using the holder 210 will be described. Fig.12 It is an exploded perspective view of the keyboard device 201 . Fig.13 (a) is a partially enlarged cross-sectional view of the keyboard device 201 showing a state in which the shaft portion 213 of the holder 210 is to be inserted into the insertion hole 223 of the white key 202a. Fig.13 (b) is a partially enlarged cross-sectional view of the keyboard device 201 showing a state in which the shaft portion 213 of the holder 210 is fitted into the insertion hole 223 of the white key 202a.

[0120] like Fig.11 and Fig.12 As shown, the protrusion 222 protrudes from the rear end of the white key 202a to the rear side. The protrusion 222 is formed into a plate shape with a size smaller than that of the white key 202a (the depressed part) in the scale direction (see Fig.12 ), an insertion hole 223 is formed in the protrusion 222 and penetrates in the scale direction.

[0121] The holder 210 includes: a mounted portion 211 mounted on the upper surface of the chassis 204 (support portion 241), a wall portion 212 rising upward from the mounted portion 211, and a substantially cylindrical shaft portion 213 formed on the upper end side of the wall portion 212, and these portions 211 to 213 are integrally formed using a resin material (synthetic resin). A plurality of wall portions 212 are arranged in the scale direction, and the protrusion 222 of the white key 202a is rotatably supported in the facing space of these plurality of wall portions 212.

[0122] In the following description, the side surface of the wall portion 212 (the surface facing the scale direction) sandwiching the protrusion 222 is described as the inner side surface 212a of the wall portion 212 (see Fig.12 ), the side opposite to the inner side surface 212a is described as the outer side surface 212b. The shaft portion 213 protrudes from the inner side surface 212a of the wall portion 212 in the scale direction.

[0123] Since the mounted portion 211 is formed in a plate shape extending in the scale direction, it is omitted in the figure, but in the support portion 241 (refer to Fig.11 ) before the state, the mounted portion 211 can be bent. By bending the mounted portion 211, the distance between the shaft portions 213 formed on the wall portion 212 is slightly expanded, so that Fig.13 As shown in (a), when the white key 202a is mounted on the holder 210, the pair of shaft portions 213 can be easily inserted into the insertion hole 223 of the white key 202a. Therefore, the workability of the mounting operation of the white key 202a can be improved.

[0124] On the other hand, after the white key 202a is mounted on the holder 210, as shown in FIG. Fig.13 As shown in (b), by fixing the holder 210 to the chassis 204 (supporting portion 241) having higher rigidity than the holder 210 (mounted portion 211), the mounted portion 211 can be prevented from bending. As a result, the distance between the shaft portions 213 facing each other can be prevented from expanding, and thus the shaft portion 213 can be prevented from being disengaged from the insertion hole 223 of the white key 202a. Therefore, the white key 202a can be prevented from falling off from the holder 210.

[0125] Furthermore, since the mounted portion 211 includes the through hole 211a formed between the wall portions 212 facing each other across the protrusion 222, the mounted portion 211 is easily bent. Therefore, the pair of shaft portions 213 can be easily inserted into the insertion hole 223 of the white key 202a.

[0126] In addition, in the present embodiment, the mounted portion 211 is formed into a substantially flat plate shape, but projections and depressions (e.g., rib-shaped protrusions) may also be formed on the mounted portion 211. That is, as long as the mounted portion 211 is configured to bend, the shape of the mounted portion 211 may be appropriately set and is not limited to a flat plate shape.

[0127] When the protrusion 222 of the white key 202a is inserted between the shaft portions 213, the insertion is guided by the inclined surface 224 formed on the protrusion 222 and the inclined surface 214 formed on the shaft portion 213. The inclined surface 224 is formed as a pair at the ends on both sides of the lower surface of the protrusion 222 in the scale direction, and the pair of inclined surfaces 224 are inclined upward toward the outside in the scale direction.

[0128] On the other hand, the inclined surface 214 of the shaft portion 213 is tilted upward in such a manner that the upper end of the top end surface of the shaft portion 213 is chamfered (away from the facing shaft portion 213). That is, since the inclined surface 214 of the shaft portion 213 is tilted in a direction corresponding to the inclined surface 224 of the white key 202a, the protrusion 222 of the white key 202a is inserted from above into the facing space of a pair of shaft portions 213, and the inclined surfaces 214, 224 slide relative to each other. By the relative sliding, the wall portion 212 is elastically deformed, and the facing interval of the pair of shaft portions 213 is automatically expanded, so that the shaft portion 213 can be easily inserted into the insertion hole 223 of the white key 202a.

[0129] The white key 202a is mounted on the holder 210 by inserting the pair of shaft portions 213 into the insertion holes 223. Since the outer side surfaces 212b of the wall portions 212 are connected to each other by the connecting portion 215, the expansion of the facing distance between the wall portions 212 after the holder 210 is mounted on the chassis 204 (support portion 241) can be limited by the connecting portion 215. Therefore, the white key 202a can be prevented from falling off from the holder 210.

[0130] The connecting portion 215 connects the outer side surfaces 212b of the wall portion 212 to each other at the lower side (mounted portion 211 side) of the shaft portion 213, and forms a gap between the outer side surfaces 212b in the area where the shaft portion 213 is formed (a position overlapping the shaft portion 213 in the scale direction). Thus, the wall portion 212 can be elastically deformed appropriately. Therefore, the white key 202a can be easily installed in the holder 210, and the installed white key 202a can be prevented from falling off from the holder 210.

[0131] A cylindrical retaining wall 217 for retaining the coil spring 216 is formed on the upper surface of the front end side of the mounted portion 211, and a plurality of retaining walls 217 are arranged in the scale direction. A conical convex portion 218 protruding upward is formed at the central portion of the inner circumference side of each retaining wall 217.

[0132] A recessed portion 225 is formed on the lower surface of the white key 202a at a position facing the holding wall 217 in the vertical direction (see Fig.11 ), a conical convex portion 226 protruding downward is formed on the inner circumference of the concave portion 225. The coil spring 216 is held by the retaining wall 217 and the inner circumference of the concave portion 225 by clamping the coil spring 216 from above and below using the convex portion 218 of the mounted portion 211 and the convex portion 226 of the white key 202a.

[0133] When the white key 202a is pressed, the elastic force of the coil spring 216 provides a key touch, and when released, the white key 202a returns to its initial position due to the elastic restoring force of the coil spring 216. During such a key press and release, the displacement member 207 is linked to the rotation of the white key 202a around the shaft 213. Fig.14 The detailed structure of the linkage of the displacement member 207 will be described.

[0134] Fig.14 (a) is to Fig.11 XIVa is a partially enlarged cross-sectional view of the keyboard device 201 after the enlargement of the part, Fig.14 (b) means from Fig.14 State (a) is a partially enlarged cross-sectional view of the keyboard device 201 in a state where the white key 202a is pressed to the end position.

[0135] like Fig.14 As shown in (a), the protrusion 228 protrudes downward from the lower surface of the white key 202a, and the guide pin 229 protrudes in the scale direction from the side surface of the protrusion 228. The protrusion 228 and the guide pin 229 are formed integrally with the white key 202a.

[0136] The guide pin 229 is slidably engaged with a groove 270 formed in the displacement member 207. The displacement member 207 is formed with an insertion hole 271 that penetrates in the scale direction, and the displacement member 207 is rotatably supported by the holder 10 by inserting the shaft portion 13 of the holder 10 into the insertion hole 271. The base plate 9 that fixes the holder 10 is supported by the bottom plate 3.

[0137] The displacement member 207 rotates relative to the shaft 13 by relative sliding between the guide pin 229 of the white key 202a and the groove 270 formed in the displacement member 207. The upper sliding surface 270a and the lower sliding surface 270b of the groove 270 are formed parallel (linearly).

[0138] In the initial state before the white key 202a is pressed, the sliding surfaces 270a and 270b of the groove 270 are aligned with the shaft portion 213 (see Fig.11 )'s displacement trajectory of the guide pin 229 extends in a crosswise manner.

[0139] Therefore, if Fig.14 As shown in (b), when the key is pressed, the guide pin 229 is rotated around the shaft portion 213 (refer to Fig.11 ) rotates, at which time the lower sliding surface 270b is pressed downward by the guide pin 229. As a result, the displacement member 207 rotates around the shaft portion 13, and with the rotation, the amount of intrusion of the detected portion 208 into the detection area facing the coil 90 increases.

[0140] On the other hand, when the white key 202a is released, the coil spring 216 (see Fig.11 ) elastic restoring force, the guide pin 229 rotates around the shaft portion 213 (refer to Fig.11 ) is rotated. The upper sliding surface 270a is pushed up by the guide pin 229 by the rotation of the guide pin 229, whereby the displacement member 207 rotates around the shaft portion 13, and the intrusion amount of the detected portion 208 relative to the detection area is reduced.

[0141] In this embodiment, the detected portion 208 is also provided in the displacement member 207 that is linked to the white key 202a. The displacement member 207 may be formed larger than the white key 202a or the hammer 6 (see Figure 1 ) is small, so it is difficult for each displacement member 207 to have a dimensional error. In addition, since the displacement member 207 is axially supported by the relatively small holder 10 mounted on the substrate 9 instead of the chassis 204, it is also difficult for the installation error of each displacement member 207 to occur. As a result, the gap between the coil 90 and the detection portion 208 is easily set to a size as designed in each key 202, so the key information of each key 202 can be detected with good accuracy.

[0142] In addition, if the guide pin 229 of the white key 202a is engaged with the groove 270 of the displacement member 207, that is, the displacement member 207 can rotate in conjunction with the white key 202a, the shape of the displacement member 207 or the arrangement of the rotation axis (shaft portion 13) can be freely changed. That is, by appropriately setting the shape of the displacement member 207 or the position of the rotation axis, the arrangement of the coil 90 can also be changed to a desired position. Therefore, the degree of freedom in the design of the keyboard device 1 is improved.

[0143] The detected part 208 includes a facing part 280 covering the bottom surface 272 of the displacement member 207 (facing the coil 90), and a front surface part 281 connected to the front end of the facing part 280 and covering the front surface 273 of the displacement member 207. As a result, when the detected part 208 begins to enter the detection area, the concentration of magnetic lines of force can be dispersed to the connection between the facing part 280 and the front surface part 281, and the upper edge 281a of the front surface part 281 (playing the role of the front surface part 281). Figure 5 (b) Same effect). Therefore, a sensor output without overshoot can be obtained, so key information can be detected with high accuracy.

[0144] In addition, since the front surface 273 of the displacement member 207 is covered by the front surface portion 281 rising from the facing surface portion 280 of the detected portion 208, even if the thickness of the detected portion 208 is reduced, the vertical width of the front surface portion 281 can be ensured to be wide. That is, since a thick metal plate as in the conventional art is not used and overshoot of the sensor output can be suppressed, an increase in weight or cost of the keyboard device 201 can be suppressed, and key information can be detected with good accuracy.

[0145] The detected portion 208 is formed by bending a metal plate to form a facing portion 280 and a front surface portion 281. Although not shown in the figure, a pair of side surfaces (facing Fig.14 The detected portion 208 is not provided on the surface perpendicular to the paper surface. Thus, the detected portion 208 can be easily formed by joining (bonding) a bent metal plate to the bottom surface 272 and the front surface 273 of the displacement member 207.

[0146] The displacement member 207 of this embodiment is mounted on the retainer 10 in the same manner as in the first embodiment. Therefore, although illustration is omitted, when the displacement member 207 is mounted on the retainer 10, the distance between the shaft portions 13 facing each other can be increased by bending the mounted portion 11 (see Figure 4 ), so the pair of shaft portions 13 can be easily inserted into the insertion hole 271 of the displacement member 207.

[0147] On the other hand, after the displacement member 207 is mounted on the holder 10, the holder 10 is fixed to the substrate 9 having higher rigidity than the holder 10 (mounted portion 11), thereby suppressing the expansion of the distance between the shaft portions 13 of the wall portion 12 (bending of the mounted portion 11). Therefore, the displacement member 7 can be suppressed from falling off from the holder 10.

[0148] Then, refer to Fig.15 and Fig.16 , a keyboard device 301 of the third embodiment is described. In the first and second embodiments, the case where the displacement member 7 and the displacement member 207 are rotated by the hammer 6 or the white key 202a is described, and in the third embodiment, a structure for directly moving the displacement member 307 is described. In addition, the same reference numerals are given to the same parts as those in the above embodiments, and their descriptions are omitted.

[0149] Fig.15 (a) is a partially enlarged cross-sectional view of a keyboard device 301 according to the third embodiment. Fig.15 (b) Yes Fig.15 (a) is a partially enlarged cross-sectional view of the keyboard device 301 taken along line XVb-XVb. Fig.16 (a) means from Fig.15 (a) is a partially enlarged cross-sectional view of the keyboard device 301 in a state where the white key 2a is pressed, Fig.16 (b) means from Fig.16 (a) is a partially enlarged cross-sectional view of the keyboard device 301 in which the white key 2a is pressed to the terminal position. Fig.15 In (b), only the main part of the keyboard device 301 is shown.

[0150] like Fig.15 As shown, in the keyboard device 301 of the third embodiment, the substrate 9 along the vertical direction is fixed to the chassis 4. Fig.15 A coil 90 is printed on the right side of the cover, and a retainer 310 is provided on the upper side of the coil 90.

[0151] The holder 310 includes a flat plate-shaped mounted portion 311 mounted on the substrate 9 and a holding portion 312 that slidably holds the displacement member 307 on the rear surface of the mounted portion 311 . These portions 311 and 312 are integrally formed using a resin material (synthetic resin).

[0152] A plurality of holding portions 312 are arranged in the scale direction, and each of the holding portions 312 includes a pair of extending portions 312a extending from the rear surface of the mounted portion 311 to the rear side (see Fig.15 (b)), and a bent portion 312b bent toward the opposing space between the pair of protruding portions 312a.

[0153] A pair of guided portions 370 extends from the front end ( Fig.15 (b) The left end of the displacing member 307 extends in the scale direction, and the displacement member 307 is formed into a T-shape when viewed from above. In the holding portion 312, a holding space that is T-shaped when viewed from above is formed by the extending portion 312a and the bent portion 312b. Fig.15 The displacement member 307 is inserted into the open portion (upper side) of (a), and the displacement member 307 is slidably held by the holding portion 312.

[0154] The lower end of the space holding the guided portion 370 of the displacement member 307 in the T-shaped holding space of the holding portion 312 is closed by a wall (not shown), and the displacement member 307 is prevented from slipping downward by the engagement between the wall and the guided portion 370 .

[0155] A pair of upper and lower protruding pieces 371 protrude rearward from the rear surface of the displacement member 307, and form an upper sliding surface 372a and a lower sliding surface 372b of the groove 372. A guide pin 65 of the weight 6 is inserted between the sliding surfaces 372a and 372b.

[0156] The upper sliding surface 372a and the lower sliding surface 372b of the groove 372 are formed in parallel (linearly). In the initial state before the white key 2a is pressed, the sliding surfaces 372a and 372b of the groove 372 extend to intersect the displacement trajectory of the guide pin 65 around the rotation axis 60.

[0157] Therefore, if Fig.16 As shown in FIG. 1 , when a key is pressed, the guide pin 65 rotates around the rotation axis 60, and at this time, the lower sliding surface 372b is pressed downward by the guide pin 65. As a result, the displacement member 307 slides and displaces downward along the holding portion 312 of the holder 310. On the other hand, when the white key 2a is released, the upper sliding surface 372a is pushed up by the guide pin 65, and the displacement member 307 slides and displaces upward along the holding portion 312. The upward and downward sliding displacement of the displacement member 307 increases or decreases the intrusion amount of the detected portion 308 relative to the detection area.

[0158] Thus, in the present embodiment, the detected portion 308 is provided in the displacement member 307 that is linked to the rotation of the white key 2a or the hammer 6. The displacement member 307 can be formed smaller than the white key 2a or the hammer 6, so that the dimensional error of each displacement member 307 is unlikely to occur. In addition, since the displacement member 307 is supported slidably by the relatively small holder 310 mounted on the base plate 9 instead of the chassis 4, the installation error of each displacement member 307 is unlikely to occur. As a result, the gap between the coil 90 and the detected portion 308 is easily set to the size of the designed value in each key 2, so the key information of each key 2 can be detected with good accuracy.

[0159] In addition, if the guide pin 65 of the hammer 6 is engaged with the groove 372 of the displacement member 307, that is, the displacement member 307 can slide in conjunction with the hammer 6, the shape of the displacement member 307 can be freely changed. That is, by appropriately setting the shape of the displacement member 307, the arrangement of the coil 90 (substrate 9) can also be changed to a desired position. Therefore, the freedom of design of the keyboard device 301 is improved.

[0160] The detected portion 308 includes a facing portion 380 that faces the coil 90 and covers the front surface of the displacement member 307, and a bottom portion 381 that is connected to the facing portion 380 and covers the bottom surface of the displacement member 307 (the outer surface of the displacement member 307 that faces the front side of the displacement direction). Thus, as in the above-described embodiments, a sensor output without overshoot can be obtained without using a thick metal plate.

[0161] The detected portion 308 is formed by bending a metal plate to form a facing portion 380 and a bottom portion 381. Although not shown in the figure, the detection portion 308 is formed by bending a metal plate to form a facing portion 380 and a bottom portion 381. Fig.16 The detected portion 308 is not provided on the surface perpendicular to the paper surface. Thus, the detected portion 308 can be easily formed by joining (bonding) a bent metal plate to the bottom surface and the front surface of the displacement member 307.

[0162] Although the above description has been given based on the above embodiment, it can be easily inferred that the present invention is not limited to the above embodiment at all, and various improvements and modifications can be made within the scope not departing from the gist of the present invention.

[0163] Part or all of the above-mentioned embodiments may be combined with part or all of other embodiments, or may be replaced. Therefore, for example, the supporting structure of the white key 202a of the second embodiment or the structure of the detection portion 208 may be applied to the keyboard device 1 of the first embodiment, and the displacement member 307 for direct motion of the third embodiment may be applied to the keyboard device 201 of the second embodiment. In addition, as a modification of the first embodiment, as in Fig. 9 , Fig.10 As described in , the displacement form (based on the sensor output of the coil 90) of the displacement member 207 or the displacement member 307 can be adjusted by changing the shape of the groove 270 of the displacement member 207 of the second embodiment or the groove 372 of the displacement member 307 of the third embodiment.

[0164] In the above-described embodiments, the case where the white key 2a, the white key 202a (key 2, key 202) is supported on the rotating shaft 20 or the shaft portion 213 so as to be rotatable (swingable) is described, but the white key 2a, the white key 202a (key 2, key 202) may also be supported in a swingable manner by other known components such as hinges.

[0165] In the above-mentioned embodiments, the coil 90 is illustrated as an example of a sensor for detecting the key information of the white key 2a, the white key 202a (key 2, key 202), but it is not necessarily limited to this. For example, a sensor that detects the key information by the change of electrostatic capacitance can 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, switches described in Japanese Patent Laid-Open No. 2015-111235) can also be used to detect the key information.

[0166] In the above-described embodiments, the guide pin 65 and the guide pin 229 are formed on the hammer 6 or the white key 202a side, and the groove 70, the groove 270 and the groove 372 are formed on the displacement member 7, the displacement member 207 and the displacement member 307 side. However, the groove may be formed on the hammer 6 or the white key 202a side, and the guide pin may be formed on the displacement member 7, the displacement member 207 and the displacement member 307 side.

[0167] In the above-mentioned embodiments, the case where a plurality of displacement members 7, displacement members 207, displacement members 307 or keys 202 are supported by holders 10, holders 210, and holders 310 extending in the scale direction is described, but the present invention is not necessarily limited to this. For example, one displacement member 7, displacement member 207, and displacement member 307 may be supported by one holder 10 and holder 310, and one white key 202a may be supported by one holder 210. In addition, the hammer 6 may be supported by a member equivalent to the holder 10, holder 210, and holder 310, and when the keyboard device 1, keyboard device 201, and keyboard device 301 are electronic organs, the pedalboard of the electronic organ may be rotatably supported by a member equivalent to the holder 10, holder 210, and holder 310.

[0168] In the above-mentioned embodiments, non-magnetic metal (copper, etc.) is exemplified as an example of the raw material of the detected part 8, the detected part 208, and the detected part 308 that changes the magnetic field of the coil 90, but the raw material of the detected part 8, the detected part 208, and the detected part 308 may be a metal having magnetism or a material having conductivity other than metal. That is, the raw material of the detected part 8, the detected part 208, and the detected part 308 is not limited as long as it is a conductor that generates eddy current according to the change of the magnetic field.

[0169] In the above-mentioned embodiments, the detected part 8, the detected part 208, and the detected part 308 are arranged on the displacement member 7, the displacement member 207, and the displacement member 307. However, the detected part 8, the detected part 208, and the detected part 308 may be arranged on other rotating members such as the key 2, the key 202, or the hammer 6.

[0170] In the above-mentioned embodiments, the front surface portion 81, the front surface portion 281, or the bottom surface portion 381 of the detected portion 8, the detected portion 208, or the detected portion 308 is provided on the outer surface of the displacement member 7, the displacement member 207, or the displacement member 307 facing the front side of the displacement direction, but the present invention is not necessarily limited to this. For example, as in the prior art, a portion corresponding to the front surface portion 81, the front surface portion 281, or the bottom surface portion 381 may be provided by joining a thick metal plate to the facing surface (the surface facing the coil 90) of the displacement member 7, the displacement member 207, or the displacement member 307. In addition, the front surface portion 81, the front surface portion 281, or the bottom surface portion 381 of the detected portion 8, the detected portion 208, or the detected portion 308 may be omitted, and the detected portion 8, the detected portion 208, or the detected portion 308 may be constituted by only the facing surface portion 80, the facing surface portion 280, or the facing surface portion 380.

[0171] In the first and second embodiments, the shaft portion 13, shaft portion 213 is formed on the retainer 10, retainer 210 side, and the insertion hole 71, insertion hole 271 for inserting the shaft portion 13, shaft portion 213 is formed on the displacement member 7, displacement member 207 side. However, the shaft portion may be formed on the displacement member 7, displacement member 207 side, and the insertion hole for inserting the shaft portion may be formed on the retainer 10, retainer 210 side.

[0172] In the first and second embodiments, the insertion holes 71 and 271 are described as through holes that penetrate the displacement members 7 and 207 , but the insertion holes 71 and 271 may be recesses (holes) formed on the side surfaces of the displacement members 7 and 207 .

[0173] In the first and second embodiments, the retainer 10 and the wall portion 12 on the retainer 210 side, the outer side surface 12b of the wall portion 212, and a part of the outer side surface 212b are connected by the connecting portion 15 and the connecting portion 215, but the present invention is not necessarily limited to this. For example, the outer side surface 12b and the outer side surface 212b may be connected as a whole from the upper end to the lower end by the connecting portion 15 and the connecting portion 215, or the connecting portion 15 and the connecting portion 215 may be omitted.

[0174] In the first embodiment, the case where the inclined surface 14 and the inclined surface 76c are formed on the guide groove 76 and the shaft portion 13 is described. In the second embodiment, the case where the inclined surface 224 and the inclined surface 214 are formed on the white key 202a and the shaft portion 213 is described. However, a structure in which these inclined surfaces are omitted (for example, the groove bottom surface 76b of the guide groove 76 is set as a plane) is also possible.

[0175] In the second and third embodiments, the detection portions 208 and 308 are formed by joining bent metal plates, but the present invention is not limited thereto. For example, the detection portions 208 and 308 may be formed by plating.

[0176] In the first embodiment, the case where the thin-walled portion (connecting portion 11b, connecting portion 11c or cutout portion 11g) is formed on the mounted portion 11 of the holder 10 or the holder 210 is described, but these thin-walled portions may be omitted and the entire mounted portion 11 may be formed with the same thickness as the base portion 11a, or a convex portion (for example, a rib-shaped protrusion) thicker than the base portion 11a may be formed on the mounted portion 11. That is, as long as the mounted portion 11 can be bent, the mounted portion 11 is not limited to the above-described form.

[0177] In the first embodiment, the front surface 73 and the rear surface 74 of the displacement member 7 are planes extending from the front and rear ends of the bottom surface 72 in the normal direction, but the front surface 73 and the rear surface 74 of the displacement member 7 may be inclined with respect to the normal direction of the bottom surface 72. In addition, the front surface 73 and the rear surface 74 of the displacement member 7 may be curved surfaces.

[0178] In the first embodiment, the guide groove 76, the protrusion 77a, the protrusion 77b, and the guide portion 78 are formed in the displacement member 7, but for example, one or more of the guide groove 76, the protrusion 77a, the protrusion 77b, and the guide portion 78 may be omitted. In addition, the guide portion 78 may be formed in a straight line instead of in an arc shape centered on the insertion hole 71.

[0179] In the first embodiment, the width dimensions of the front surface portion 81 of the detected portion 8 (the height from the opposing portion 80) are substantially constant, and the upper edge 81a of the front surface portion 81 is formed in a straight line along the scale direction, but the present invention is not limited thereto. For example, the upper edge 81a of the front surface portion 81 may have a concave-convex or curved portion (for example, the upper edge 81a of the front surface portion 81 is mountain-shaped).

[0180] In the first embodiment, the case where the facing surface portion 80, the front surface portion 81, the rear surface portion 82, and the side surface portion 83 of the detection portion 8 are formed by plating, that is, the case where the detection portion 8 is formed by plating a part of the displacement member 7, for example, the detection portion 8 may be formed by plating the entire displacement member 7 (the entire surface). In addition, a structure may be adopted in which the detection portion 8 (the facing surface portion 80, the front surface portion 81, the rear surface portion 82, and the side surface portion 83) is formed by joining a metal plate to the displacement member 7. In the case of such a structure, the detection portion 8 may be formed by a single metal plate or by a plurality of metal plates.

[0181] In the first embodiment, the case where the facing portion 80 and the front surface portion 81 of the detected portion 8 are connected via the bent portion 84 is described, but for example, a structure in which the bent portion 84 is omitted (the connecting portion between the facing portion 80 and the front surface portion 81 is angular) may be adopted.

[0182] Explanation of symbols

[0183] 1, 201, 301: Keyboard device

[0184] 7, 207, 307: Displacement components

[0185] 8, 208, 308: Detected part (conductor)

[0186] 80, 280, 380: for face

[0187] 81, 281: Front surface

[0188] 381: Bottom part (front surface part)

[0189] 82: Rear surface

[0190] 83: Side face

[0191] 84: Bending part

[0192] 90: Coil

Claims

1. A keyboard device, characterized in that include: Coil, generating magnetic field; A displacement member is displaced at a position facing the coil when a key is pressed; and a conductor, disposed on the displacement member, The conductor includes: a facing portion, facing the coil when the key is pressed and covering the outer surface of the displacement member; and a front surface portion connected to the facing portion and covering an outer surface of the displacement member facing forward in the displacement direction.

2. The keyboard device according to claim 1, characterized in that: The conductor includes: a rear surface portion connected to the facing portion and covering an outer surface of the displacement member facing rearward in a displacement direction; and a side surface portion connected to the rear surface portion and the facing portion and covering a pair of outer surfaces of the displacement member facing a direction orthogonal to the displacement direction.

3. The keyboard device according to claim 1, characterized in that: The facing portion and the front surface portion are formed by joining a metal plate to the displacement member. The conductor is not provided on a pair of outer surfaces of the displacement member facing a direction perpendicular to the displacement direction.

4. The keyboard device according to claim 3, characterized in that: The facing surface portion and the front surface portion are formed by bending a single metal plate.

5. The keyboard device according to claim 1, characterized in that: The rising height of the front surface portion from the facing surface portion is substantially constant.

6. The keyboard device according to claim 1, characterized in that: The conductor includes a bent portion that connects the facing portion and the front surface portion in a bent manner.

7. A method for detecting key information of a keyboard device, the keyboard device comprising: Coil, generating magnetic field; A displacement member is displaced at a position facing the coil when a key is pressed; and a conductor, which is arranged on the displacement member, the conductor comprising: a facing portion, which faces the coil when the key is pressed and covers the outer surface of the displacement member; and a front surface portion connected to the opposing surface portion and covering the outer surface of the displacement member facing the front side of the displacement direction, wherein the key information detection method is characterized in that: The displacement of the displacement member causes the conductor to be relatively displaced with respect to the coil, thereby detecting the key-pressing information of the key.

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