JP6332595B2 - Reaction force generator - Google Patents

Description

  The present invention relates to a reaction force generation device in which a reaction force generation member having a dome portion that generates a reaction force due to elastic deformation with respect to operation of an operation element is fixed on a support member.

  Conventionally, a keyboard instrument such as an electronic organ or an electronic piano has been provided with a reaction force generating member having a dome portion (rubber dome) made of an elastic body for applying a reaction force to a key pressing operation. is there. For example, in Patent Document 1 below, a dome that is formed in a dome shape and is elastically deformed by pressing in the axial direction to generate a reaction force corresponding to the amount of elastic deformation is connected to the lower end of the dome, and is outside. A reaction force generating member in which a base portion extending in a plate shape and a leg portion protruding like a rod from the lower surface of the base portion are integrally formed by an elastic body is supported so that the key can swing upward. A keyboard device fixed on a key frame (shelf) is shown. In this keyboard device, on a flat support member (substrate) fixed on a key frame, a circular shape in which the inner surface is extended over the entire circumference in a direction (plate thickness direction) perpendicular to the upper surface thereof. A through hole having a transverse cross section is formed, and a cross section perpendicular to the axis of the leg portion is formed in a circle, and the leg portion is formed in the through hole in a state where the axial direction of the leg portion coincides with the plate thickness direction. The reaction force generating member is fixed to the support member by press-fitting the lower surface of the base portion and closely contacting the lower surface of the base portion with the upper surface of the support member.

JP 2007-25576 A

  However, in the reaction force generating member integrally formed with an elastic body, when the reaction force generating member is pulled out from the mold, the leg portion is a thin portion that is difficult to forcibly remove, and the dome portion is also formed thin. Therefore, the axial center direction of the dome portion and the axial center direction of the leg portion cannot be greatly shifted. Although the reaction force generating member can be formed by molding even if the axial direction of the dome portion and the axial direction of the leg portion are greatly shifted, it is necessary to use a complicated die. . On the other hand, in the keyboard device, the axial center direction of the dome portion is not always the plate thickness direction of the support member. For example, due to the structure of the keyboard device, the pressing direction of the dome portion by the key may be different from the thickness direction of the support member. In addition, due to the key support structure, it may be necessary to make the pressing direction against the dome portion different between the white key and the black key. In such a case, it is necessary to form a through hole in the support member whose axis is shifted in a direction different from the plate pressure direction. However, if the axial direction of the through hole and the plate thickness direction are significantly different, There exists a problem that the process which forms a hole in a supporting member becomes difficult and complicated.

  The present invention has been made to cope with such a problem, and the object thereof is to simplify the reaction force generating member by molding when the axial center direction of the dome portion is different from the plate thickness direction of the support member. It is another object of the present invention to provide a reaction force generator that can be easily manufactured and that can easily form a through hole that allows a leg portion to pass through a support member. In the description of each constituent element of the present invention below, the reference numerals of corresponding portions of the embodiment are shown in parentheses in order to facilitate understanding of the present invention. The present invention should not be construed as being limited to the configurations of the corresponding portions indicated by the reference numerals of the forms.

  In order to achieve the above-described object, the feature of the present invention is that it is integrally formed by an elastic body and has a radial length from one end portion in the axial center (Yw, Yb) direction to the other end portion in the axial direction. A dome portion (21w1) that is gradually increased and is formed in a dome shape by opening the other end portion in the axial direction, and elastically deforms by pressing in the axial direction to generate a reaction force corresponding to the amount of elastic deformation. , 21b1), a base portion (21w3, 21b3) that is connected to the other end of the dome portion and extends outwardly, and has a flat surface opposite to the dome portion, and a dome portion of the base portion A reaction force generating member (21w, 21b) having rod-shaped leg portions (21w4, 21b4) extended from the surface opposite to the surface, and an installation surface for installing the surface opposite to the dome portion of the base portion And having a through hole (31d1) penetrating from the installation surface to the other surface And a support member (31d) having a flat installation surface, the leg portion is inserted into the through-hole, and the surface opposite to the dome portion of the base portion is brought into close contact with the installation surface, and the reaction force A reaction force generating device that fixes a generating member to a support member, and in the mounted state of the reaction force generating member with the leg portion penetrating into the through hole on the support member, in the vicinity of the base portion of the leg portion The part is deformed so that the extending direction of the leg part is different from the extending direction of the leg part before the reaction force generating member is mounted on the support member.

  In this case, for example, the dome portion is pressed in the axial direction by a key operation on a keyboard instrument, and is gradually elastically deformed from the start of pressing to gradually increase the reaction force as the amount of elastic deformation increases. After reaching the peak, it buckles and deforms to reduce the reaction force rapidly.

  In the present invention configured as described above, in the mounted state of the reaction force generating member having the leg portion penetrated into the through hole on the support member, the leg portion is deformed in the vicinity of the base portion. The extending direction is different from the extending direction of the leg part before the reaction force generating member is mounted on the support member. Therefore, when the axial direction of the dome portion is different from the plate thickness direction of the support member, the axial direction of the leg portion before mounting the reaction force generating member on the support member is made to coincide with the axial direction of the dome portion or The dome portion of the base portion is not greatly displaced with respect to the axial center direction of the dome portion, and the axial center of the through hole is aligned with the plate thickness direction of the support member or not greatly displaced with respect to the plate thickness direction. The reaction force generating member can be fixed to the support member by bringing the surface opposite to the contact surface into close contact with the installation surface of the support portion. As a result, according to the present invention, the reaction force generating member can be manufactured by simple molding, and a through hole that allows the support member to penetrate the leg portion can be easily formed.

  Another feature of the present invention is that grooves (21w5, 21b5) are provided along the outer periphery of the leg portion at the connecting portion of the leg portion in the base portion. According to this, in the mounting state on the support member of the reaction force generating member obtained by deforming the vicinity of the base portion in the leg portion, the protruding portion to the outside of the deformed portion of the leg portion is accommodated in the groove. Since it does not interfere with the inner peripheral surface of the through hole, the base portion can be brought into close contact with the installation surface of the support member with high accuracy, and the reaction force generating member can be stably fixed to the support member.

  Another feature of the present invention is that a notch (31d2) is provided along the inner periphery of the through hole on the installation surface side of the support member. Even in this state, in the mounting state of the reaction force generating member in which the vicinity of the base portion of the leg portion is deformed on the support member, the protruding portion of the leg portion outside the deformed portion is accommodated in the notch. Since it does not interfere with the inner peripheral surface of the through hole, the base portion can be brought into close contact with the installation surface of the support member with high accuracy, and the reaction force generating member can be stably fixed to the support member.

  In addition, another feature of the present invention relates to the support member that protrudes outward from an intermediate portion of the leg portion in the axial center direction, at the position of the other surface of the support member or in the vicinity of the other surface of the through hole. The engaging portion (21w6, 21b6) is provided. In this case, for example, the engaging portion is engaged with the support member on one plane (Kp) over the entire circumference of the leg portion. According to this, after the reaction force generation member is assembled to the support member, the engagement portion prevents the leg portion from coming out of the through hole, so that the reaction force generation member is stably and reliably attached to the support member. It becomes fixed.

1 is a schematic side view of a keyboard device according to a first embodiment of the present invention. It is a schematic plan view of the keyboard apparatus of FIG. (A) is an expanded longitudinal cross-sectional view before mounting of the reaction force generation member which concerns on 1st Embodiment of this invention, (B) is the leg part of the base part vicinity of the reaction force generation member of (A). It is an enlarged vertical cross-sectional view, (C) is an enlarged vertical cross-sectional view after mounting the reaction force generating member, (D) is an enlarged view of the leg portion in the vicinity of the base portion of the reaction force generating member of (C). It is a longitudinal cross-sectional view. (A) is an expanded longitudinal cross-sectional view before mounting of the reaction force generation member which concerns on 2nd Embodiment of this invention, (B) is an expanded longitudinal cross-sectional view after mounting of the said reaction force generation member. (A) is an expanded longitudinal cross-sectional view before mounting of the reaction force generation member which concerns on 3rd Embodiment of this invention, (B) is an expansion which shows the one leg part front-end | tip part of the reaction force generation member of (A). It is a figure, (C) is an enlarged view which shows the other leg part front-end | tip part of the reaction force generation member of (A), (D) is an expansion longitudinal cross-sectional view after mounting of the said reaction force generation member.

a. First Embodiment Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a schematic side view of the keyboard device according to the first embodiment viewed from the right, and FIG. 2 is a schematic plan view of the keyboard device. In FIG. 1, the front-back direction of the keyboard device is the left-right direction, and the up-down direction of the keyboard device is the up-down direction.

  The keyboard device includes a plurality of white keys 11w and a plurality of black keys 11b that are pressed and released by the performer, and a plurality of reaction force generating members 21w and 21b that apply a reaction force to the performer's key pressing operation. And. The white key 11w is formed in an elongated shape in the front-rear direction and is formed in a U-shaped cross section with the lower part opened, and is disposed on the flat plate upper plate portion 31a of the key frame 31. The key frame 31 includes flat leg portions 31b and 31c extending downward from the front end and the rear end of the upper plate portion 31a, and a frame FR provided in the musical instrument at the lower end portions of the leg portions 31b and 31c. It is fixed on the top. On the upper surface of the rear end portion of the upper plate portion 31a of the key frame 31, a pair of plate-like key support portions 32 that are opposed to each other inside the white key 11w are fixed upright. The upper part of the key support part 32 is provided with protrusions protruding outward at positions facing each other, and the protrusions enter the through holes provided at the rear end portions of both sides of the white key 11w so as to be rotatable from the inside. I am letting. Thereby, the white key 11w is supported by the key support part 32 so that rocking is possible, and the front-end part is displaced to an up-down direction. In the following description, the swing center of the white key 11w is defined as a swing axis Cw. The black key 11b is different in the shape in which the front upper surface is raised, but the other configuration is the same as the white key 11w. The black key 11b is also supported by the key support portion 32 so as to be swingable about the swing axis Cb, and the front end portion is displaced in the vertical direction by swinging.

  On the upper surface of the upper plate portion 31a of the key frame 31, a key guide 33w is erected at a position below the front end of the white key 11w, and the key guide 33b is erected at a position below the front end of the black key 11b. Has been established. The key guides 33w and 33b are slidably inserted into the white key 11w and the black key 11b, respectively, and the white key 11w and the black key 11b are not displaced in the left-right direction when they are swung in the up-down direction. ing.

  The reaction force generating member 21w is provided for each white key 11w, and the reaction force generating member 21b is provided for each black key 11b. The reaction force generating members 21w and 21b are fixed to the upper surface of a support portion 31d formed integrally with the upper plate portion 31a of the key frame 31 below the central portion in the front-rear direction of the white key 11w and the black key 11b. Yes. The plurality of reaction force generating members 21w and 21b are formed by integral molding and arranged in a row in the lateral direction of the keyboard. The support portion 31d is formed in a flat plate shape, and the front end is positioned below the rear end. The support portion 31d corresponds to the support member of the present invention. Therefore, axial centers Yw and Yb, which will be described later, of the reaction force generating members 21w and 21b are tilted so that the upper portions are positioned forward. Further, even if the distances from the swing axes Cw and Cb to the reaction force generation members 21w and 21b are different, as described later, the pressing direction at the reaction force peak coincides with the directions of the axial centers Yw and Yb. The forward tilt of the reaction force generating member 21b for the black key 11b is slightly larger than the forward tilt of the reaction force generating member 21w for the white key 11w.

  In the first embodiment, a plurality of reaction force generating members 21w for the white key 11w and a plurality of reaction force generating members 21b for the black key 11b are arranged side by side and at the same height as shown in FIG. Although formed, individual reaction force generating members 21w and 21b may be provided for each key. Further, the front-rear direction position and / or height position of the reaction force generation member 21 w for the white key 11 w may be different from the front-rear direction position and / or height position of the reaction force generation member 21 b for the black key 11 b. Good. This also applies to each embodiment and modification described later.

  Here, the reaction force generating members 21w and 21b and the support portion 31d will be described in detail with reference to FIG. FIG. 3A is an enlarged longitudinal sectional view of the reaction force generating members 21w and 21b before mounting, that is, an enlarged longitudinal sectional view of the reaction force generating members 21w and 21b as single elements. FIG. 3B is an enlarged longitudinal sectional view of the leg portions 21w4 and 21b4 in the vicinity of the base portions 21w3 and 21b3 of the reaction force generating members 21w and 21b of FIG. FIG. 3C is an enlarged longitudinal sectional view after the reaction force generating members 21w and 21b are mounted. FIG. 3D is an enlarged vertical sectional view of the leg portions 21w4 and 21b4 in the vicinity of the base portions 21w3 and 21b3 of 21w and 21b of FIG. 3C.

  The reaction force generating members 21w and 21b are integrally formed of elastic rubber and include dome portions 21w1 and 21b1, top portions 21w2 and 21b2, base portions 21w3 and 21b3, and leg portions 21w4 and 21b4. In this case, the shape of the reaction force generating member 21w for the white key 11w and the shape of the reaction force generating member 21b for the black key 11b are slightly different in terms of the forward tilt, but the difference in shape is slight. In addition, since the features of the present invention are the same, the following description will be made assuming that both reaction force generating members 21w and 21b have the same shape.

  The dome portions 21w1 and 21b1 are thin-walled domes that are gradually deformed by pressing from above by gradually increasing the diameters (radial lengths) around the shaft centers Yw and Yb from the top to the bottom. The lower end is opened in a circular shape. The cross-sectional shape orthogonal to the axial centers Yw and Yb of the dome portions 21w1 and 21b1 is a circle. The dome portions 21w1, 21b1 are elastically deformed by increasing the pressing force from above and gradually increase the reaction force, and after the reaction force reaches its peak, the reaction force is rapidly decreased by buckling deformation. The top portions 21w2 and 21b2 are formed in a cylindrical shape having an open upper surface, and are connected to the upper surfaces of the dome portions 21w1 and 21b1 on the lower surface. Further, the top portions 21w2 and 21b2 are set to a uniform height over the entire circumference, and the upper surface thereof is a flat surface.

  The base portions 21w3 and 21b3 are continuously connected to the lower surfaces of the dome portions 21w1 and 21b1, are formed thick in the vertical direction, and extend outward from the outer peripheral surface of the lower surfaces of the dome portions 21w1 and 21b1 in a plate shape. It is installed. The upper and lower surfaces of the base portions 21w3 and 21b3 are also flat, and the upper surfaces are parallel to the upper inner surfaces of the dome portions 21w1 and 21b1 and the upper surfaces of the top portions 21w2 and 21b2, that is, the axis Yw of the dome portions 21w1 and 21b1. , Yb. The lower surfaces of the base portions 21w3 and 21b3 are inclined with respect to the upper surface, and the thickness on the front side is larger than the thickness on the rear side. Grooves 21w5 and 21b5 are formed on the lower surfaces of the base portions 21w3 and 21b3 at the outer peripheral surface positions of the leg portions 21w4 and 21b4 over the entire circumference (see FIG. 3C). The cross-sectional shape in the radial direction of the grooves 21w5 and 21b5 is a substantially semicircular shape in the present embodiment, but may be a quadrangular shape or a triangular shape instead of a semicircular shape.

  The top portions 21w2 and 21b2 and the base portions 21w3 and 21b3 are hardly deformed even when pressed from above. At least the dome portions 21w1, 21b1 and the top portions 21w2, 21b2 of the reaction force generating members 21w, 21b configured as described above have a point-symmetric shape over the entire circumference with respect to the axial centers Yw, Yb. Further, the normal lines of the top surfaces of the top portions 21w2 and 21b2 and the base portions 21w3 and 21b3 are parallel to the directions of the axial centers Yw and Yb, respectively.

  A pair of leg portions 21w4 and 21b4 are integrally formed on the lower surface of the base portions 21w3 and 21b3. The pair of leg portions 21w4 and 21b4 protrude in a bar shape downward from the lower surface of the base portions 21w3 and 21b3, and the diameter of the tip portion is gradually reduced. The leg portions 21w4 and 21b4 are provided with columnar holes extending in the directions of the axial centers Yk and Yk continuously from the upper surface of the base portions 21w3 and 21b3, that is, cylindrically provided with a meat steal to prevent the occurrence of sink marks. Is formed. The direction of the axis Yk is the extending direction of the leg portions 21w4 and 21b4. Moreover, the directions of the axial centers Yk and Yk of the pair of leg portions 21w4 and 21b4 are the same, and both are parallel to the axial centers Yw and Yb of the dome portions 21w1 and 21b1 and the top portions 21w2 and 21b2. Accordingly, when the reaction force generating members 21w and 21b are formed using a mold, the reaction force generating members 21w and 21b can be easily formed without forcibly removing the thin leg portions 21w4 and 21b4.

  The pair of leg portions 21w4 and 21b4 of the reaction force generating members 21w and 21b configured as described above are press-fitted into the pair of through holes 31d1 provided in the support portion 31d of the upper plate portion 31a of the key frame 31, respectively. The generating members 21w and 21b are fixed on the support portion 31d. The support portion 31d is a flat plate having a constant thickness. A direction orthogonal to the upper surface of the support portion 31d is referred to as a plate thickness direction in this specification. In the first embodiment, since the upper surface and the lower surface of the support portion 31d are parallel, the plate thickness direction is also a direction orthogonal to the lower surface of the support portion 31d. The through hole 31d1 is a cylindrical hole that penetrates the support portion 31d in the plate thickness direction, and its axis is Yp. That is, the axis Yp is parallel to the thickness direction of the support portion 31d. The direction of the axis Yp is the extending direction of the through hole 31d1. The cross-sectional shape of the through hole 31d1 orthogonal to the axis Yp is circular, and the inner diameter thereof is slightly smaller than the outer diameters of the upper ends and intermediate portions of the leg portions 21w4 and 21b4. Further, a notch 31d2 is provided in the vicinity of the upper surface of the through hole 31d1 over the entire circumference (see FIG. 3D). In this embodiment, the radial cross-sectional shape of the notch 31d2 is a triangular shape such as a chamfer and is a convex shape with its upper surface protruding upward, but it is simply a triangular shape and its upper surface. May be a flat surface or a concave shape with the upper surface protruding downward.

  In the formation of such a through hole 31d1, when the support portion 31d (upper plate portion 31a) is formed of a resin molded product, the through hole 31d1 is formed using an upper mold and a lower mold having a simple configuration. What is necessary is just to shape | mold the support part 31d. Further, when the support portion 31d is made of a metal plate, the through hole 31d1 as described above may be formed in the support portion 31d by simple punching, pressing, or the like. Further, burring processing, reamer processing, or the like may be performed.

  A method of fixing the reaction force generating members 21w and 21b to the support portion 31d having the through hole 31d1 configured as described above will be described. In this case, the operator aligns the tip ends of the leg portions 21w4 and 21b4 of the reaction force generating members 21w and 21b with the axial center Yp position of the through hole 31d1, and then moves the reaction force generating members 21w and 21b from above to the leg portions 21w4 and 21b4. The legs 21w4 and 21b4 are pushed into the through hole 31d1 by pushing in the direction Yb of the axis 21b4 or the direction Yp of the through hole 31d1. In this case, the axial center Yp of the through hole 31d1 is parallel to the plate thickness direction of the support portion 31d, the axial center Yk of the leg portions 21w4 and 21b4 is not perpendicular to the lower surfaces of the base portions 21w3 and 21b3, and When the reaction force generating members 21w and 21b are mounted on the support portion 31d, the bottom surfaces of the base portions 21w3 and 21b3 are in close contact with the top surface of the support portion 31d. Unlike the axial center Yp direction of the through hole 31d1, some interference occurs between the outer peripheral surface of the leg portions 21w4 and 21b4 and the inner peripheral surface of the through hole 31d1. However, when the leg portions 21w4 and 21b4 are pushed into the through hole 31d1, the leg portions 21w4 and 21b4 are deformed, and the bottom surfaces of the base portions 21w3 and 21b3 are in close contact with the top surface of the support portion 31d (ie, In the reaction force generating members 21w and 21b attached to the support portion 31d), the axis Yk of the leg portions 21w4 and 21b4 coincides with the axis Yp of the through hole 31d1. In other words, in the mounting state of the reaction force generating members 21w and 21b in which the leg portions 21w4 and 21b4 have entered the through hole 31d1 on the support portion 31d, the portions near the base portions 21w3 and 21b3 in the leg portions 21w4 and 21b4 are arranged. By deforming, the extending direction of the leg parts 21w4 and 21b4 is different from the extending direction of the leg parts 21w4 and 21b4 before the reaction force generating members 21w and 21b are mounted on the support part 31d.

  In the present embodiment, a pair of leg portions 21w4 and 21b4 is provided on each side of each reaction force generating member 21w and 21b, and a pair of leg portions 21w4 and 21b4 is provided corresponding to the pair of leg portions 21w4 and 21b4. The through hole 31d1 is provided in the support portion 31d. However, the leg portions 21w4 and 21b4 are on the lower surface of the base portions 21w3 and 21b3, and their positions may be anywhere as long as the reaction force generating members 21w and 21b can be fixed to the support portion 31d. The number of leg portions 21w4 and 21b4 with respect to one reaction force generating member 21w and 21b may be a number other than two, for example, one. Then, the above-described through hole 31d1 may be provided in the support portion 31d in accordance with the leg portions 21w4 and 21b4. This point can also be applied to other embodiments and modifications described later.

  Returning to the description of FIG. 1 again, the reaction force generating member 21w is located at the lower surface of the white key 11w and the black key 11b and facing the upper surfaces of the top portions 21w2, 21b2 of the reaction force generating members 21w, 21b. , 21b for pressing from above is provided. The pressing portions 11w1 and 11b1 are formed in a flat plate shape, and the lower surface thereof is horizontal in this embodiment. Then, at the peak of the reaction force of the reaction force generating members 21w and 21b, the normal line of the lower surface of the pressing portions 11w1 and 11b1 (straight line perpendicular to the lower surface) is aligned with the axial centers Yw and Yb of the reaction force generating members 21w and 21b. Each becomes parallel. Depending on the inclination angle of the reaction force generating members 21w, 21b, the pressing portions 11w1, 11b1 may be slightly inclined with respect to the horizontal. Further, the lower surfaces of the pressing portions 11w1 and 11b1 may not be flat but may be spherical. Furthermore, the pressing portions 11w1 and 11b1 may be configured by cross-shaped or H-shaped ribs that protrude downward from the inner upper surfaces of the white key 11w and the black key 11b.

  The keyboard device also includes white keys incorporated between the white key 11w and the black key 11b and the upper plate portion 31a of the key frame 31 at an intermediate position between the pressing portions 11w1 and 11b1 and the key support portion 32. An 11w spring 34w and a black key 11b spring 34b are provided. The springs 34w and 34b urge the white key 11w and the black key 11b upward with respect to the upper plate portion 31a. The springs 34w and 34b may be springs such as leaf springs as long as the white key 11w and the black key 11b can be urged upward without being coiled.

  The white key 11w includes an extending portion 11w2 extending downward from the front end portion thereof, and an engaging portion 11w3 protruding forward is provided at the lower end of the extending portion 11w2, and the engaging portion 11w3 is a key frame. Through the through hole provided in the upper plate portion 31a of 31, the lower part of the upper plate portion 31a is entered from above. Further, an upper limit stopper member 35 w is provided on the lower surface of the front end portion of the upper plate portion 31 a of the key frame 31. The upper limit stopper member 35w is composed of a cushioning member such as a felt, and restricts the upward displacement of the front end portion of the white key 11w by contacting the engaging portion 11w3 of the white key 11w. A lower limit stopper member 36 w is provided on the upper surface of the front end portion of the upper plate portion 31 a of the key frame 31. The lower limit stopper member 36w is also composed of a cushioning member such as felt, and restricts the downward displacement of the front end portion of the white key 11w by contacting the lower surface of the front end portion of the white key 11w.

  The black key 11b is provided with an extending portion 11b2 extending downward from the front end portion thereof, and an engaging portion 11b3 protruding backward is provided at the lower end of the extending portion 11b2, and the engaging portion 11b3 is a key frame. Through the through hole provided in the upper plate portion 31a of 31, the lower part of the upper plate portion 31a is entered from above. An upper limit stopper member 35 b is provided on the lower surface of the intermediate portion of the upper plate portion 31 a of the key frame 31. The upper limit stopper member 35w is also made of a cushioning member such as a felt, and restricts the upward displacement of the front end portion of the black key 11b by contact with the engaging portion 11b3 of the black key 11b. A lower limit stopper member 36b is provided on the upper surface of the intermediate portion of the upper plate portion 31a of the key frame 31. The lower limit stopper member 36b is also composed of a cushioning member such as a felt, and restricts the downward displacement of the front end portion of the black key 11b by contacting the lower surface of the front end portion of the black key 11b.

  Further, the electric circuit board 37 is fixed so as to be parallel to the upper plate portion 31a on the lower surface of the upper plate portion 31a of the key frame 31 and slightly behind the reaction force generating members 21w and 21b. On the upper surface of the electric circuit board 37, dome-shaped key switches 38w and 38b for the white key 11w and the black key 11b are fixed, respectively. When the white key 11w and the black key 11b are depressed, the key switches 38w and 38b are pressed by the projecting portions projecting from the lower surfaces of the white key 11w and the black key 11b to change from the off state to the on state. 11w and black key 11b are detected. The detection of the key release operation by the key switches 38w and 38b is used for the generation control of the musical tone signal.

  Next, the operation of the keyboard device according to the first embodiment configured as described above will be described. When the performer starts to press the white key 11w and the black key 11b, the white key 11w and the black key 11b start swinging around the swing axes Cw and Cb against the reaction force of the springs 34w and 34b, The front ends of the white key 11w and the black key 11b are displaced downward to disengage the engaging portions 11w3 and 11b3 from the upper limit stopper members 35w and 35b, and then the pressing portions 11w1 and 11b1 are the top portions of the reaction force generating members 21w and 21b. It contacts the rear end of the upper surface of 21w2, 21b2. When the white key 11w and the black key 11b are further pressed, the front ends of the white key 11w and the black key 11b are further displaced downward, and the domes of the reaction force generating members 21w and 21b are pressed by the pressing portions 11w1 and 11b1. The parts 21w1, 21b1 begin to deform almost evenly over the entire circumference. Accordingly, the performer starts to feel the gradually increasing reaction force of the reaction force generating members 21w and 21b in addition to the reaction force by the springs 34w and 34b. In this case, the deformation of the dome portions 21w1 and 21b1 is substantially symmetric with respect to the axial centers Yw and Yb.

  However, in reality, the reaction force generating members 21w and 21b are pressed by the white key 11w and the black key 11b that rotate around the swing axes Cw and Cb, respectively, and the white key 11w and the reaction force generating members 21w and 21b Since the pressing direction of the black key 11b changes according to the turning operation of the white key 11w and the black key 11b, the deformation of the dome portions 21w1 and 21b1 is not strictly symmetrical with respect to the axial centers Yw and Yb. However, the change in the pressing direction is slight, and at the peak of the reaction force, the reaction force generating member 21w, 21b, with the normal lines on the lower surfaces of the pressing portions 11w1, 11b1 being parallel to the axes Yw, Yb. Since 21b is pressed by the white key 11w and the black key 11b, the deformation of the dome portions 21w1 and 21b1 may be regarded as being substantially symmetric with respect to the axial centers Yw and Yb.

  When the white key 11w and the black key 11b are further pressed, the reaction force of the reaction force generating members 21w and 21b reaches a peak, and then the dome portions 21w1 and 21b1 start to buckle. In this case, buckling of the dome portions 21w1 and 21b1 occurs almost simultaneously over the entire circumference. As a result, the reaction force of the reaction force generating members 21w and 21b against the player's key depression decreases rapidly, and the player feels a clear click feeling. Note that the key switches 38w and 38b change from the off state to the on state by being slightly delayed from the buckling and by pressing the protruding portions protruding from the lower surfaces of the white key 11w and the black key 11b. In response to the change of the key switches 38w and 38b to the on state, a tone signal generation circuit (not shown) starts to generate tone signals.

  Further, when the white key 11w and the black key 11b are pressed, the dome portions 21w1 and 21b1 are further deformed to increase the reaction force after the reaction force is rapidly reduced. Thereafter, the lower surfaces of the front ends of the white key 11w and the black key 11b come into contact with the lower limit stopper members 36w and 36b, and the swinging of the white key 11w and the black key 11b is finished. In this state, the elastic deformation of the reaction force generating members 21w and 21b is also finished.

  When the white key 11w and the black key 11b are released, the front ends of the white key 11w and the black key 11b are displaced upward by the reaction force of the reaction force generating members 21w and 21b and the springs 34w and 34b. In the process in which the front ends of the white key 11w and the black key 11b are displaced upward, the key switches 38w and 38b change from the on state to the off state, and the tone signal generation circuit (not shown) stops generating the tone signal. To control. Further, in the process in which the front end portions of the white key 11w and the black key 11b return upward, the reaction force generating members 21w and 21b start to return to the original shape. Further, when the front end portions of the white key 11w and the black key 11b are displaced upward, the engaging portions 11w3 and 11b3 come into contact with the upper limit stopper members 35w and 35b, and the white key 11w and the black key 11b return to the key release state. Then, the key release operation of the white key 11w and the black key 11b ends.

  In the reaction force generation device according to the first embodiment configured and operated in this manner, the reaction force generation members 21w and 21b in which the leg portions 21w4 and 21b4 are inserted into the through holes 31d1 are mounted on the support portion 31d. Then, the leg portions 21w4 and 21b4 are deformed in the vicinity of the base portions 21w3 and 21b3 so that the extending directions of the leg portions 21w4 and 21b4 are before the reaction force generating members 21w and 21b are mounted on the support portion 31d. The direction is different from the extending direction of the leg portions 21w4 and 21b4. Accordingly, when the directions of the axial centers Yw and Yb of the dome portions 21w1 and 21b1 are different from the plate thickness direction of the support portion 31d, the leg portions 21w4 and 21b4 before the reaction force generating members 21w and 21b are attached to the support portion 31d. Even if the axial center Yk direction coincides with the axial centers Yw and Yb directions of the dome portions 21w1 and 21b1, and the axial center Yp of the through hole 31d1 coincides with the plate thickness direction of the support portion 31d, the base portions 21w3 and 21b3. The reaction force generation members 21w and 21b can be fixed to the support portion 31d by bringing the lower surface of the support member 31d into close contact with the upper surface of the support portion 31d. As a result, according to the first embodiment, the reaction force generating members 21w and 21b can be manufactured by simple mold molding, and the through holes 31d1 through which the leg portions 21w4 and 21b4 pass can be easily formed in the support portion 31d. become.

  In the reaction force generator according to the first embodiment, grooves 21w5 and 21b5 are provided along the outer periphery of the leg portions 21w4 and 21b4 in the connecting portions of the leg portions 21w4 and 21b4 in the base portions 21w3 and 21b3. It was. Further, a notch 31d2 is provided on the upper surface side of the support portion 31d along the inner periphery of the through hole 31d1. Thus, according to the first embodiment, when the reaction force generating members 21w and 21b are deformed in the vicinity of the base portions 21w3 and 21b3 in the leg portions 21w4 and 21b4, Since the projecting portions of the deformed portions 21w4 and 21b4 to the outside are accommodated in the grooves 21w5 and 21b5 and the notch 31d2 and do not interfere with the inner peripheral surface of the through hole 31d1, the base portions 21w3 and 31b3 are supported by the support portion 31d. The reaction force generating members 21w and 21b can be stably fixed to the support portion 31d.

  In the first embodiment, the grooves 21w5 and 21b5 are provided in the base portions 21w3 and 21b3, and the notch 31d2 is provided in the support portion 31d. However, only one of the grooves 21w5 and 21b5 and the notch 31d2 may be provided. Also by this, the outward projecting portion of the deformed portion of the leg portions 21w4 and 21b4 is accommodated in one of the grooves 21w5 and 21b5 and the notch 31d2, and does not interfere with the inner peripheral surface of the through hole 31d1. The support portions 21w3 and 31b3 can be brought into close contact with the upper surface of the support portion 31d with high accuracy, and the reaction force generating members 21w and 21b can be fixed to the support portion 31d stably.

b. Second Embodiment Next, a reaction force generator according to a second embodiment of the present invention will be described with reference to FIG. FIG. 4A is an enlarged longitudinal sectional view before mounting of the reaction force generating members 21w and 21b, that is, an enlarged longitudinal sectional view of the reaction force generating members 21w and 21b as single elements. FIG. 4B is an enlarged longitudinal sectional view after the reaction force generating members 21w and 21b are mounted.

  In the reaction force generation device according to the second embodiment, the reaction force generation members 21w and 21b are attached to the support portion 31d, that is, in a state where the reaction force generation members 21w and 21b are a single body, the pair of leg portions 21w4. , 21b4 is inclined at a predetermined angle in the same direction with respect to the axial centers Yw, Yb of the dome portions 21w1, 21b1. The leg portions 21w4 and 21b4 are formed in a columnar shape. The axis Yp of the pair of through holes 31d1 is also inclined at a predetermined angle in the same direction with respect to the plate thickness direction of the support portion 31d. The direction of the axial center Yk of the leg portions 21w4 and 21b4 with respect to the axial centers Yw and Yb of the leg portions 21w4 and 21b4 and the reaction force generating members 21w and 21b before the reaction force generating members 21w and 21b are attached to the support portion 31d. The direction of the axial center Yk after mounting is different from the direction of the axial centers Yw, Yb of the dome portions 21w1, 21b1.

  Also in the second embodiment, when the reaction force generating members 21w and 21b are fixed to the support portion 31d having the through hole 31d1, the operator can move the tips of the leg portions 21w4 and 21b4 of the reaction force generating members 21w and 21b. Is aligned with the axial center Yp position of the through hole 31d1, and then the reaction force generating members 21w and 21b are pushed from above in the direction of the axial center Yk of the leg portions 21w4 and 21b4 or in the direction substantially the same as the axial center Yp direction of the through hole 31d1, The leg portions 21w4 and 21b4 are pushed into the through hole 31d1. Also in this case, as in the case of the first embodiment, there is some interference between the outer peripheral surface of the leg portions 21w4 and 21b4 and the inner peripheral surface of the through hole 31d1, but the leg portions 21w4 and 21b4 pass through. When it is pushed into the hole 31d1, the leg portions 21w4 and 21b4 are deformed, and the bottom surfaces of the base portions 21w3 and 21b3 are in close contact with the upper surface of the support portion 31d (that is, the support of the reaction force generating members 21w and 21b). In the mounting state on the portion 31d), the axis Yk of the leg portions 21w4 and 21b4 coincides with the axis Yp of the through hole 31d1.

  In other words, also in this case, in the mounting state of the reaction force generating members 21w and 21b in which the leg portions 21w4 and 21b4 have entered the through hole 31d1 to the support portion 31d, the base portions 21w3 and 21b3 in the leg portions 21w4 and 21b4 are provided. The extending direction of the leg portions 21w4 and 21b4 is different from the extending direction of the leg portions 21w4 and 21b4 before the reaction force generating members 21w and 21b are mounted on the support portion 31d. . Therefore, also in the second embodiment, when the axial center Yw, Yb direction of the dome portions 21w1, 21b1 and the plate thickness direction of the support portion 31d are different, the axial center Yk direction of the leg portions 21w4, 21b4 is set to the dome portion 21w1. , 21b1 without shifting the axial center Yw, Yb direction and the axial center Yp of the through hole 31d1 with the plate thickness direction of the support part 31d, the lower surfaces of the base parts 21w3, 21b3 are supported by the support part 31d. The reaction force generating members 21w and 21b can be fixed to the support portion 31d by being in close contact with the upper surface of the support portion 31d. As a result, according to the second embodiment as well, the reaction force generating members 21w and 21b can be manufactured by simple molding, and the through holes 31d1 through which the leg portions 21w4 and 21b4 pass can be easily formed in the support portion 31d. Become.

  Other configurations and operations are the same as those in the first embodiment, and a description thereof will be omitted. Therefore, also in the second embodiment, the same effect as the first embodiment is expected.

  In the description of the second embodiment, the description of the grooves 21w5 and 21b5 provided along the outer periphery of the leg portions 21w4 and 21b4 and the notch 31d2 provided along the inner periphery of the through hole 31d1 is omitted. However, also in this second embodiment, the same effect as in the case of the first embodiment is expected by providing it in one or both of the grooves 21w5, 21b5 and the notch 31d2. Further, in the second embodiment, the leg portions 21w4 and 21b4 are formed in a columnar shape. However, as in the first embodiment, a meat stealer for preventing the occurrence of sink marks may be provided and formed in a cylindrical shape. Good.

  Further, in the second embodiment, the axis centers Yk of the pair of leg portions 21w4 and 21b4 are parallel to each other, and the axis centers Yp of the pair of through holes 31d1 are also parallel to each other. However, the axial centers Yk of the pair of leg portions 21w4 and 21b4 may not be parallel, and the axial centers Yp of the pair of through holes 31d1 may not be parallel.

c. Third Embodiment Next, a reaction force generator according to a third embodiment of the present invention will be described with reference to FIG. FIG. 5A is an enlarged longitudinal sectional view before mounting the reaction force generating members 21w and 21b, that is, an enlarged longitudinal sectional view of the reaction force generating members 21w and 21b as single elements. FIG. 5B is an enlarged view of the distal end portions of the leg portions 21w4 and 21b4 on the left side of the reaction force generating members 21w and 21b of FIG. 5A. FIG. 5C is an enlarged view of the distal end portions of the leg portions 21w4 and 21b4 on the right side of the reaction force generating members 21w and 21b in FIG. FIG. 5D is an enlarged longitudinal sectional view after mounting the reaction force generating members 21w and 21b.

  In the reaction force generating members 21w and 21b, engaging portions 21w6 and 21b6 projecting outward over the entire circumference are provided at intermediate portions near the tips of the leg portions 21w4 and 21b4. The engaging portions 21w6 and 21b6 are formed in a substantially semicircular longitudinal cross-sectional shape, and the upper end portion, that is, the protruding position on the side opposite to the tip end, is positioned in one plane over the entire circumference. This one plane is indicated by a two-dot chain line Kp in the figure. The engaging portions 21w6 and 21b6 engage with the lower surface of the support portion 31d outside the through hole 31d1 at the plane Kp when the reaction force generating members 21w and 21b are attached to the support portion 31d.

  In the third embodiment, the axis Yk of the pair of leg portions 21w4 and 21b4 of the reaction force generating members 21w and 21b before being attached to the support portion 31d is the same as the axis Yw and Yb of the dome portions 21w1 and 21b1. Parallel. However, the axis Yp of the pair of through holes 31d1 is inclined by different predetermined angles with respect to the thickness direction of the support portion 31d. Then, before the reaction force generating members 21w and 21b are attached to the support portion 31d, the plane Kp faces different directions in the left and right leg portions 21w4 and 21b4 in the drawing (see FIG. 5A). Regarding the left leg portions 21w4 and 21b4 in FIG. 5A, the axis Yk of the leg portions 21w4 and 21b4 before mounting, the normal Lk of the plane Kp with respect to the engaging portions 21w6 and 21b6, and the base portion 21w3. , 21b3 is shown in FIG. 5B as a relationship with the normal line Lb of the lower surface. FIG. 5C shows the relationship between the axis Yk and the normals Lk and Lb with respect to the leg portions 21w4 and 21b4 on the right side of FIG. 5A. In this case, the normal line Lk related to the left leg portions 21w4 and 21b4 and the direction Lk related to the right leg portions 21w4 and 21b4 are different. However, after the reaction force generating members 21w and 21b are mounted on the support portion 31d, the planes Kp related to the pair of left and right leg portions 21w4 and 21b4 are the same and coincide with the lower surface of the support portion 31d.

  When the reaction force generating members 21w and 21b are assembled to the support portion 31d, when the leg portions 21w4 and 21b4 are inserted into the through holes 31d1, the engaging portions 21w6 and 21b6 of the leg portions 21w4 and 21b4 are formed through the through holes. Since it slightly interferes with the inner peripheral surface of 31d1, it is difficult to slightly penetrate the leg portions 21w4 and 21b4 through the through hole 31d1 as compared with the reaction force generators according to the first and second embodiments. However, since the interference is slight, the reaction force generating members 21w and 21b are assembled to the support portion 31d without any problem.

  Also in the third embodiment, in the mounting state of the reaction force generating members 21w and 21b in which the leg portions 21w4 and 21b4 have entered the through hole 31d1 to the support portion 31d, the base portions of the leg portions 21w4 and 21b4 are provided. By deforming the vicinity of 21w3 and 21b3, the extending direction of the leg portions 21w4 and 21b4 is different from the extending direction of the leg portions 21w4 and 21b4 before the reaction force generating members 21w and 21b are mounted on the support portion 31d. Become a direction. Therefore, also in the third embodiment, when the axial centers Yw and Yb of the dome portions 21w1 and 21b1 are different from the plate thickness direction of the support portion 31d, the axial center Yk direction of the leg portions 21w4 and 21b4 is set to the dome portion 21w1. , 21b1 are aligned with the axis Yw, Yb direction, and the axis Yp of the through hole 31d1 is not significantly displaced from the plate thickness direction of the support portion 31d, and the lower surfaces of the base portions 21w3, 21b3 are aligned with the upper surface of the support portion 31d. The reaction force generating members 21w and 21b can be fixed to the support portion 31d by being in close contact with each other. As a result, according to the second embodiment as well, the reaction force generating members 21w and 21b can be manufactured by simple molding, and the through holes 31d1 through which the leg portions 21w4 and 21b4 pass can be easily formed in the support portion 31d. Become.

  In the third embodiment, when the reaction force generating members 21w and 21b are attached to the support portion 31d, the engaging portions 21w6 and 21b6 are placed on the entire lower surface of the support portion 31d outside the through hole 31d1. Engage in contact. Therefore, in this case, the leg portions 21w4 and 21b4 are prevented from coming off from the through hole 31d1, and the reaction force generating members 21w and 21b are firmly fixed to the support portion 31d. Further, since the upper ends of the engaging portions 21w6 and 21b6 are in contact with the lower surface of the support portion 31d over the entire circumference in the plane Kp and engage with the support portion 31d, the support portions 31d of the reaction force generating members 21w and 21b are engaged. Stabilization to is stable.

  Other configurations and operations are the same as those in the first and second embodiments, and a description thereof will be omitted. Therefore, also in the third embodiment, the same effect as in the first and second embodiments is expected.

  In the description of the third embodiment, the description of the grooves 21w5 and 21b5 provided along the outer periphery of the leg portions 21w4 and 21b4 and the notch 31d2 provided along the inner periphery of the through hole 31d1 is omitted. However, also in the third embodiment, the same effect as in the case of the first embodiment is expected by providing it in one or both of the grooves 21w5, 21b5 and the notch 31d2. Also, in the third embodiment, the leg portions 21w4 and 21b4 are formed in a columnar shape. However, as in the first embodiment, a meat stealer for preventing the occurrence of sink marks is provided and formed in a cylindrical shape. Also good.

  In the second embodiment, the axial centers Yk of the pair of leg portions 21w4 and 21b4 are both parallel to the axial centers Yw and Yb of the dome portions 21w1 and 21b1. However, as in the second embodiment, the shaft centers Yk of the pair of leg portions 21w4 and 21b4 are parallel to each other, but may not be parallel to the shaft centers Yw and Yb of the dome portions 21w1 and 21b1. Moreover, the axis Yk of a pair of leg part 21w4, 21b4 does not need to be parallel.

  In the second embodiment, the axis Yp of the pair of through holes 31d1 is inclined by different predetermined angles with respect to the plate thickness direction of the support portion 31d. However, as in the first embodiment, the axis Yp of the pair of through holes 31d1 may be parallel and coincide with the plate thickness direction of the support portion 31d. Moreover, although the axial center Yp of a pair of through-hole 31d1 is parallel like the said 2nd Embodiment, it does not need to correspond with the plate | board thickness direction of the support part 31d.

  In the third embodiment, the engaging portions 21w6 and 21b6 of the leg portions 21w4 and 21b4 are engaged with the lower surface of the support portion 31d outside the through hole 31d1. However, instead of this, the inner peripheral surface of the through hole 31d1 may be cut out at a position near the lower surface of the support portion 31d to form a recess, and the engagement portion may be engaged with the recess.

d. Other Modifications and Application Examples Next, modifications of the above embodiment and other application examples of the present invention will be described. In the various embodiments and the modifications thereof, the cross-sectional shape orthogonal to the axis Yk of the leg portions 21w4 and 21b4 and the leg portions 21w4 and 21b4 of the through hole 31d1 is circular. However, these cross-sectional shapes are not limited to a circle but may be an ellipse, an ellipse, or the like. In short, the leg portions 21w4 and 21b4 are formed in a rod shape, and the through hole 31d1 only needs to have a cross-sectional shape corresponding to the cross-sectional shape of the leg portions 21w4 and 21b4.

  Moreover, in the said various embodiment and those modifications, the cross-sectional shape orthogonal to the axial centers Yw and Yb of the dome parts 21w1 and 21b1 was made circular. However, the cross-sectional shape is not limited to a circle, and may be an ellipse or an ellipse. In this case as well, the dome portions 21w1, 21b1 have a shape in which the radial length is gradually increased toward the lower side over the entire circumferential direction.

  In the above-described various embodiments and their modifications, examples have been described in which the white key 11w and the black key 11b are swung around the rotation axis. However, the present invention is not limited to this, and by providing a plate-like thin portion at the rear ends of the white key 11w and the black key 11b, and supporting the rear end of the thin portion with a support member, the white key 11w and the A hinge-type swing fulcrum that swings the black key 11b may be used.

  In the above-described various embodiments and modifications thereof, the reaction force generating members 21w and 21b are provided independently of the key switches 38w and 38b. However, instead of this, the key switches 38w, 38b may be configured in the same manner as the reaction force generating members 21w, 21b, and the key switches 38w, 38b may be used as the reaction force generating members. In this case, the dome portions 21w1 and 21b1 have a two-stage configuration including an inner portion and an outer portion, and a cylindrical switch portion with a small amount of deformation is provided between the inner portion and the outer portion. Then, a reaction force that increases against the key press is generated by the deformation of the outer portion, and the contact provided on the substrate is opened and closed by the switch portion, and the reaction force against the key press accompanied by buckling deformation by the deformation of the inner portion. Should be generated.

  Further, in the various embodiments and their modifications, the reaction force generating members 21w and 21b are fixed to the support portion 31d, and the reaction force generating members 21w and 21b1 are pressed by the pressing portions 11w1 and 11b1 of the white key 11w and the black key 11b. 21b was pressed. However, instead of this, the reaction force generating members 21w, 21b are fixed to the white key 11w and the black key 11b, and the pressing portion is located at a position facing the reaction force generating members 21w, 21b in the upper plate portion 31a of the key frame 31. The reaction force generating members 21w and 21b may be pressed by the pressing portion by swinging the white key 11w and the black key 11b. However, in this case, the dome portions 21w1 and 21b1, the top portions 21w2 and 21b2, the base portions 21w3 and 21b3, and the leg portions 21w4 and 21b4 of the reaction force generating members 21w and 21b are vertically different from the case of the above embodiment. Is reversed. In this case, it is necessary to form the reaction force generating members 21w and 21b separately and fix the reaction force generating members 21w and 21b individually to the white key 11w and the black key 11b.

  In the above-described various embodiments and their modifications, the reaction force generating members 21w and 21b are directly pressed by the white key 11w and the black key 11b. However, the reaction force generation according to the present invention is also applied to the keyboard device in which the swinging body that swings in conjunction with the swing of the white key 11w and the black key 11b indirectly presses the reaction force generating members 21w and 21b. The device can be applied. That is, a rocking body (for example, a hammer) that rocks in conjunction with the rocking of the white key 11w and the black key 11b is provided, a pressing portion is provided on the rocking body, and a reaction force is provided at a position facing the pressing portion of the support member. Generation members 21w and 21b are provided. Also by this, the same effects as those in the above-described various embodiments and their modifications can be expected for the key release operation of the white key 11w and the black key 11b. Alternatively, the reaction force generation members 21w and 21b may be provided on the oscillator side, and the pressing portion may be provided at a position facing the reaction force generation members 21w and 21b.

  Moreover, in the above-described various embodiments and modifications thereof, examples have been described in which the reaction force generating members 21w and 21b are fixed so that the axial centers Yw and Yb of the dome portions 21w1 and 21b1 extend in the vertical direction. . However, the reaction force generation members 21w and 21b may be fixed so that the axial centers Yw and Yb of the dome portions 21w1 and 21b1 extend in a direction that is not in the vertical direction. For example, the white key 11w and the black key 11b are integrally extended from the vicinity of the swing axes Cw and Cb in a direction (for example, a right angle direction) different from the extending direction (that is, the horizontal direction) of the white key 11w and the black key 11b. The extending member is provided on the white key 11w and the black key 11b so that the extending member swings in a direction substantially perpendicular to the extending direction (for example, a substantially horizontal direction) by pressing the white key 11w and the black key 11b. To. In this case, when the reaction force generating members 21w and 21b are fixed to the extending member or fixed to a position facing the extending member, the axes Yw and Yb of the dome portions 21w1 and 21b1 are in directions other than the vertical direction ( For example, the reaction force generating members 21w and 21b are fixed so as to be in the horizontal direction. Also, when using a rocking body such as a hammer, depending on the rocking direction of the rocking body, the reaction force generating member 21w, the axial centers Yw and Yb of the dome portions 21w1 and 21b1 are in directions other than the vertical direction. 21b is fixed. In short, in the present invention, the reaction force generating members 21w and 21b may be fixed to the support member on the opening side of the dome portions 21w1 and 21b1, and the directions of the axial centers Yw and Yb are various directions other than the vertical direction. Can be considered.

  Furthermore, the reaction force generating device according to the present invention can be applied to operators other than the white key 11w and the black key 11b of the keyboard device. That is, a reaction force is applied to an operation element operated by a hand, a foot, or the like by using the reaction force generating members 21w and 21b as in the above-described embodiment and the modified example. May be. The operation element in this case is not limited to the one that oscillates around the oscillation center, and may be an operation element that translates along the axial direction of the dome portion.

11w ... White key, 11b ... Black key, 11w1, 11b1 ... Pressing part, 21w, 21b ... Reaction force generating member, 21w1, 21b1 ... Dome part, 21w2, 21b2 ... Top part, 21w3, 21b3 ... Base part, 21w4 , 21b4 ... Leg part, 21w5, 21b5 ... Groove, 21w6, 21b6 ... Engagement part, 31 ... Key frame, 31a ... Upper plate part, 31d ... Support part, 31d1 ... Through hole, 31d2 ... Notch, 32 ... Key support 34w, 34b ... Spring, Yb, Yw ... Axis center of the dome, Kw ... Axis center of the leg

Claims (6)

It is integrally formed with an elastic body,
The length in the radial direction is gradually increased from one end in the axial direction toward the other end in the axial direction, and the other end in the axial direction is opened to form a dome shape. A dome part that is elastically deformed by pressing and generates a reaction force according to the amount of elastic deformation;
A base portion connected to the other end portion of the dome portion and extending outward, and having a flat surface opposite to the dome portion; and a surface of the base portion opposite to the dome portion A reaction force generating member having a rod-like leg extending from
A support member having an installation surface on which the surface of the base portion opposite to the dome portion is installed, a through-hole penetrating from the installation surface to the other surface, and the installation surface being formed in a plane; With
The reaction force generating member is fixed to the support member by allowing the leg portion to enter the through hole and bringing the surface of the base portion opposite to the dome portion into close contact with the installation surface. A reaction force generator,
In the mounting state of the reaction force generating member in which the leg portion has entered the through hole on the support member, the extending portion of the leg portion is deformed by deforming a portion of the leg portion in the vicinity of the base portion. However, the reaction force generating device is different from the extending direction of the leg portion before the reaction force generating member is mounted on the support member. The reaction force generation device according to claim 1 , wherein a groove is provided along a periphery of the leg portion in a connection portion of the leg portion in the base portion.   The reaction force generation device according to claim 1, wherein a notch is provided on an installation surface side of the support member along an inner periphery of the through hole.   An engaging portion that protrudes outward from an intermediate portion in the axial direction of the leg portion and engages with the support member at the position of the other surface of the support member or the position near the other surface of the through hole. The reaction force generator according to any one of claims 1 to 3, further comprising:   The reaction force generation device according to claim 4, wherein the engaging portion is engaged with the support member on a single plane over the entire circumference of the leg portion.   The dome portion is pressed in the axial direction by the key operation of the keyboard instrument, gradually elastically deforms from the start of pressing, gradually increases the reaction force as the amount of elastic deformation increases, and the reaction force reaches a peak. The reaction force generator according to any one of claims 1 to 5, wherein the reaction force is rapidly reduced by buckling later.

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