JP6102968B2 - Keyboard device - Google Patents

Description

  The present invention relates to a keyboard device in which the swing of a plurality of keys is restricted by a substrate provided below the plurality of keys.

  Conventionally, for example, as shown in Patent Document 1 below, the front end portion is disposed so as to face the lower surfaces of the plurality of keys supported by the support member so as to be swingable in the vertical direction. Keyboard devices with a fixed substrate are well known. In this type of keyboard device, an engagement piece that is integrally molded with the key, extends downward from the lower surface of the key, and has a protruding portion that protrudes rearward at the lower end portion is provided to engage the front end portion of the board. It is located behind the upper portion of the protrusion and above the protrusion in the combined piece, and the upward displacement of the front end portions of the plurality of keys is restricted by the engagement of the protrusion portion with the lower surface of the front end portion of the board. ing.

  This board is generally elongated in the left-right direction of a keyboard consisting of a plurality of keys, and a connecting board connecting a plurality of boards is formed by punching with a mold, and a component is placed on the connecting board. Separate and use one by one after mounting. In this case, it is common to perform the following first or second processing on the connection substrate. In the first processing, as shown in FIG. 10, V is a groove having a V-shaped cross section, with blades placed on the front and back surfaces between adjacent substrates 101 in a connecting substrate 100 in which a plurality of substrates 101 are connected. A cut 102 is provided. As shown in the second processing process, FIG. 11, a plurality of slit holes or perforations 103 penetrating the connection substrate 100 are provided between the adjacent substrates 101 in the connection substrate 100 to which the plurality of substrates 101 are connected. In both the case of the V cut 102 and the perforation 103, the connection substrate 100 is divided by the positions of the V cut 102 and the perforation 103 to separate one substrate 101.

Japanese Patent Application Laid-Open No. 2001-67075

  However, when the V cut 102 as the first processing is provided, it is necessary to form the V cut 102 in a separate process from the process of punching the connecting substrate 100 with a mold, and the manufacturing process is different. The manufacturing cost of the substrate 101 increases due to the complexity. Further, in the case of the V cut 102, when the connecting substrate 100 is divided by the position of the V cut 102, burrs are likely to remain on the end surface of the substrate 101 at the divided position, and the accuracy of the end surface of the substrate 101 is poor. is there.

  On the other hand, in the case where the perforation 103 which is the second processing process is provided, the perforation 103 can be formed in the same process as the process of punching and forming the connecting substrate 100 with a mold, thereby simplifying the manufacturing process. Thus, the manufacturing cost of the substrate 101 can be reduced. In the case of the perforation 103, when the connecting substrate 100 is divided by the position of the perforation 103, almost no burrs remain on the end surface of the substrate 101 at the position of the break, and the accuracy of the end surface of the substrate 101 is good. Become.

  However, when the substrate 101 is divided at the position of the perforation 103, the joint portion 103a (see FIG. 11A) of the perforation 103 remains. In particular, depending on how the connection substrate 100 is divided, a large joint portion 103 a may remain on the front end surface side of the substrate 101. In this case, in the keyboard device described above, when the engaging piece having the protruding portion that restricts the upward displacement of the front end portions of the plurality of keys is located at the position facing the perforation 103, the front end of the key by the key release operation. When the portion swings, the joint portion 103a may come into contact with the rear surface of the engagement piece, and the operation of the key may become unstable or noise may occur. Therefore, it is necessary to increase the distance from the front end surface of the substrate 101 to the rear surface of the engagement piece to some extent. In this case, the length in the front-rear direction of the protrusion provided on the engagement piece must be increased. There is a restriction on the design of the key including the engaging piece. Also, if the length of the protruding portion is large in the front-rear direction, when the key is supported by the support member, it becomes difficult for the protruding portion to enter the lower surface side of the front end portion of the substrate, and the assembling efficiency of the key to the support member is deteriorated. There is also a problem.

  An object of the present invention is to provide a keyboard device that uses a board that can be manufactured inexpensively and easily, and that solves the problem of the design limitation of the key including the engagement piece and the problem of the assembly efficiency of the key to the support member. It is to provide. 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 present invention is characterized in that the white key (31, 41) is formed in an elongated shape in the front-rear direction and is supported by the support member (12) so that the front end portion can swing in the vertical direction. And a plurality of keys composed of black keys (51) and a substrate (20) formed in a flat plate shape and fixed so as to face the lower surfaces of the plurality of keys, and downward from the lower surfaces of the plurality of keys Engaging pieces (31a, 41a1, 51a1) each having a protruding portion (31a1, 41a1, 51a1) protruding rearward from the lower end portion are provided on a plurality of keys, respectively, and the front end portion of the board is engaged. It is positioned behind the upper part of the protrusion and above the protrusion in the combined piece, and the upward displacement of the front end of the plurality of keys is restricted by the engagement of the protrusion with the lower surface of the front end of the substrate. In the keyboard device, a plurality of substrates are connected through perforations (25). A single substrate obtained by dividing the connected connecting substrate (20A) at the perforation position, and when the perforation is positioned on the engagement piece side of the plurality of keys, the joint portion (25a) of the perforation is engaged. One substrate in which perforations are formed so as not to face the piece is used as the fixed substrate.

  In this case, the fixed substrate includes, for example, an electric wiring pattern and a key switch (21). In addition, the engagement piece has, for example, left and right side walls extending downward from the lower surfaces of the plurality of keys, and the protruding portion protrudes rearward from the lower end portions of the left and right side walls. Moreover, the joint part of a perforation is located between the right and left side walls of the engagement piece provided in the white key or the black key, for example.

  In the present invention configured as described above, when the perforation is located on the engagement piece side of the plurality of keys, the perforation is formed such that the joint portion does not face the engagement piece. Therefore, even if the distance from the front end surface of the substrate to the rear surface of the engagement piece is not increased, the joint portion remaining when the connection substrate is broken when the front end portion of the key is swung by the key release operation is the engagement piece. Touching the rear surface of the key does not cause the key to become unstable or generate noise. As a result, according to the feature of the present invention, the length in the front-rear direction of the protrusion provided on the engagement piece can be reduced, and the design restrictions of the key including the engagement piece are eliminated. In addition, since the length of the projecting portion in the front-rear direction can be reduced, when the key is assembled to support the support member, the projecting portion of the engagement piece can easily enter the lower surface side of the front end portion of the board, and the key is supported. The assembly efficiency to the member is also good.

  Another feature of the present invention is that the joint portion of the perforation is located between the left and right side walls of the engagement piece provided on the white key. The distance between the left and right side walls of the engagement piece provided on the white key is generally longer than the distance between the left and right side walls of the engagement piece provided on the black key. Therefore, even if there is a slight misalignment in the left-right direction of the perforation, according to another feature of the present invention, the operation of the key is unstable due to the contact of the joint portion of the perforation with the rear surface of the engagement piece. Noise generation is better prevented.

  In addition, another feature of the present invention is that the horizontal position of the perforated joint portion is set in the vicinity of the horizontal position of the plurality of key positioning portions (33c) when the plurality of keys are supported by the support member. It is in. In this case, the vicinity of the horizontal position of the plurality of key positioning portions is, for example, not more than twice the lateral width of one white key or black key in the left-right direction from the positioning portion. Due to differences in dimensional tolerances and molding conditions, a certain amount of error must be taken into account for the width of the key. In this case, in the key far from the positioning portion among the plurality of keys, the left and right positions are more greatly shifted, and there is a high possibility that the joint portion of the perforation contacts the rear surface of the engagement piece. Therefore, according to the other feature of the present invention, the unstable operation of the key and the generation of noise due to the contact of the joint portion of the perforation with the rear surface of the engagement piece can be prevented better.

It is a schematic perspective view which shows 1 octave of the keyboard apparatus which concerns on 1st Embodiment. FIG. 2A is a plan view of the keyboard device with the upper cover of FIG. 1 removed, and FIG. 2B is a side view of the keyboard device with the upper cover of FIG. 1 removed. (A) is a top view of the 1st key unit in the keyboard apparatus of FIG. 1 thru | or FIG. 3, (B) is a side view of the said 1st key unit. (A) is a top view of the 2nd key unit in the keyboard apparatus of FIG. 1 thru | or FIG. 3, (B) is a side view of the said 2nd key unit. (A) is a top view of the 3rd key unit in the keyboard apparatus of FIG. 1 thru | or FIG. 3, (B) is a side view of the said 3rd key unit. It is a top view of the connection board which connected a plurality of electric circuit boards. It is the figure which looked at the key and electric circuit board in the keyboard device concerning a 1st embodiment of Drawing 1 thru / or Drawing 3 from the lower part. It is the figure which looked at the key and electric circuit board in the keyboard device concerning a 2nd embodiment from the lower part. It is the figure which looked at the key and electric circuit board in the keyboard device concerning a 3rd embodiment from the lower part. It is a top view of the connection board | substrate which connected the some board | substrate which shows a prior art. It is a top view of the connection board | substrate which connected the some board | substrate which shows a prior art.

Hereinafter, various embodiments of the present invention will be described.
a. First Embodiment Hereinafter, a keyboard device according to a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a schematic perspective view showing one octave of a keyboard device. 2A is a plan view of the keyboard device with the upper cover of FIG. 1 removed, and FIG. 2B is a side view of the keyboard device with the upper cover of FIG. 1 removed. In this specification, the player side (the lower left side in FIG. 1 and the lower side in FIG. 2) is the front side of the keyboard device, and the side opposite to the performer (the upper right side in FIG. 1 and the upper side in FIG. 2) is the keyboard. Be behind the device. The left / right direction of the player (from the upper left to the lower right in FIG. 1 and the left / right direction in FIG. 2) is defined as the left / right direction of the keyboard device.

  The keyboard device has a key frame 10 fixed in the keyboard instrument below the keyboard. The key frame 10 is a flat plate member that is integrally formed of metal, resin, or the like, extends horizontally in the left-right and front-rear directions, and is long in the left-right direction. A plurality of support portions 11 and 12 are respectively provided at intermediate portions and a rear end portion of the key frame 10 at appropriate positions in the left-right direction. The support parts 11 and 12 are formed integrally with the key frame 10 in a cylindrical shape, protrude upward from the upper surface of the key frame 10, and have internal threads formed therein. An electric circuit board 20 is placed and fixed on the upper surface of the support portion 11. In addition to the electric circuit board 20, a keyboard made up of first to third key units 30, 40, and 50 each integrally molded with a resin, which will be described in detail later, is placed and fixed on the upper surface of the support portion 12. .

  In a portion of the key frame 10 that is located slightly forward of the support portion 11, the downward displacement of the front end portions of the white keys 31, 41 and the black key 51 is restricted when the white keys 31, 41 and the black key 51 are pressed. A lower limit stopper portion 13 is provided. The lower limit stopper 13 protrudes upward in a U shape so that the front end is slightly lower than the rear end, and extends in the left-right direction and is formed integrally with the key frame 10. A cushioning material 14 such as a long felt extending in the left-right direction is attached to the upper surface of the lower limit stopper portion 13 in order to alleviate the collision with the white keys 31, 41 and the black key 51.

  The electric circuit board 20 is integrally formed of a resin or the like into a flat plate shape and a rectangular shape that is long in the left-right direction. On the upper surface of the electric circuit board 20, a key switch 21 configured by a rubber dome switch is disposed, and an electric circuit component (not shown) An electrical wiring pattern (copper foil pattern) is provided. A long felt extending in the left-right direction on the lower surface of the front end portion of the electric circuit board 20 and at the front position of the support portion 11 so as to alleviate the collision with the white keys 31, 41 and the black key 51. A cushioning material 22 such as is attached. The electric circuit board 20 and the buffer material 22 restrict the upward displacement of the front ends of the white keys 31, 41 and the black key 51 when the white keys 31, 41 and the black key 51 are released.

  In the front part of the electric circuit board 20, a screw through-hole 22 a is provided at a position corresponding to the position of the support part 11 of the key frame 10 for passing a male screw that is screwed into the female screw of the support part 11. Yes. Further, at the rear end portion of the electric circuit board 20, a screw through hole 22 b is provided at a position corresponding to the support portion 12 of the key frame 10 to allow a male screw to be screwed into the female screw of the support portion 12. ing. Furthermore, a through hole 22c for press-fitting a positioning projection 33c provided on the lower surface of a common mounting portion 33 (to be described later) of the first key unit 30 is also provided at an appropriate position on the rear end portion of the electric circuit board 20. In addition, a through hole 22d is provided for allowing the protruding piece 33f provided on the lower surface of the common mounting portion 33 to pass therethrough. The male screw is not shown in the figure. The configuration of the electric circuit board 20 will be described in detail later with reference to FIG. 7 including the through holes 22a, 22b, 22c, and 22d.

  An upper cover 15 extending in the left-right direction is provided above the rear end portion of the key frame 10. The upper cover 15 covers the rear end portions of the first to third key units 30, 40, 50 (parts slightly rearward from the rear ends of the white keys 31, 41 and the black key 51), and has an appearance. It is a member for keeping good.

  Next, the first key unit 30 will be described with reference to a plan view of FIG. 3A and a side view of FIG. The first key unit 30 has four white keys 31 that are not adjacent to each other corresponding to the pitch names C, E, G, and B, respectively. The white key 31 is composed of an upper wall, a front wall, left and right side walls, and a rear wall, and forms a rectangular space with the inside opened downward. Steps for securing the space for the black key 51 are provided on the upper wall and the left and right side walls.

  At an intermediate position in the front-rear direction on the lower surface of the white key 31, there is an engagement piece 31a having a U-shaped cross section consisting of a front wall and left and right side walls that extend downward from the lower surface of the white key 31 and open the rear. It is formed integrally with the white key 31. The lower surface of the engagement piece 31 a abuts against the cushioning material 14 when the white key 31 is depressed, and restricts the downward displacement of the front end portion of the white key 31. On the rear surface of the left and right side walls of the engagement piece 31a, a pair of projecting portions 31a1 projecting rearward at the lower end portions thereof are provided. When the white key 31 is released, the protrusion 31 a 1 is brought into contact with the cushioning material 22, that is, the projection 31 a 1 is engaged with the front end of the electric circuit board 20 via the cushioning material 22. The upward displacement of the part is restricted. Further, a pressing portion 31b that presses the key switch 21 when the white key 31 is pressed is located at an intermediate position in the front-rear direction on the lower surface of the white key 31 and opposed to the key switch 21 provided on the electric circuit board 20. Is provided.

  The rear walls of these four white keys 31 are connected to a common attachment portion (rail portion) 33 via a hinge portion 32, respectively. The hinge part 32 and the common attachment part 33 are integrally formed with the white key 31. The hinge portion 32 is connected to the rear wall of the white key 31 at the front portion formed thick, and is connected to the common attachment portion 33 at the rear portion formed thin, elastically deforming in the vertical direction, When the white key 31 is pressed and released, the front end of the white key 31 is swung up and down.

  The common attachment portion 33 is a member that is long in the left-right direction and has a longitudinal cross section in the front-rear direction, and has a concave portion 33a that extends in the left-right direction on the lower surface, and extends in the left-right direction on the upper surface. It has the convex part 33b made. On the lower surface of the common mounting portion 33, a protrusion 33c protruding downward is provided at an appropriate location in the left-right direction (in this embodiment, one location between the both ends in the left-right direction and the middle portion). The protrusion 33c is formed in a cylindrical shape with the lower end chamfered, and the through hole 22c (FIG. 2B) provided in the electric circuit board 20 when the common mounting portion 33 is assembled to the rear end of the electric circuit board 20. (See FIG. 7). A through hole 33d is provided at an appropriate position in the left-right direction in the common attachment portion 33 (one place in the middle in the left-right direction in the present embodiment). The through-hole 33d is formed in a circular shape, and presses a later-described protrusion 43c provided on the second key unit 40 when the second key unit 40 is assembled on the first key unit 30. Further, a through hole 33e is also provided at a position in the left-right direction corresponding to the support portion 12 of the key frame 10 in the common attachment portion 33. The through-hole 33e is formed in a circular shape having a slightly larger diameter than the through-hole 33d, and allows a male screw (not shown) to pass through when the first to third key units 30, 40, 50 are assembled to the key frame 10.

  Furthermore, projecting pieces 33 f projecting downward are also provided at appropriate locations in the left-right direction on the lower surface of the common mounting portion 33 (two locations in the middle in the left-right direction in this embodiment). The protruding piece 33f is inserted into the through hole 22d (see FIGS. 2B and 7) provided in the electric circuit board 20 with a slight gap when the common mounting portion 33 is assembled to the rear end of the electric circuit board 20. Being a guide function.

  Next, the 2nd key unit 40 is demonstrated using the top view of FIG. 4 (A), and the side view of FIG. 4 (B). The second key unit 40 has three white keys 41 corresponding to the pitch names D, F, and A, respectively. The white key 41 is also composed of an upper wall, a front wall, left and right side walls, and a rear wall, and forms a rectangular space with the inside opened downward. The length and height of the white key 41 in the front-rear direction are the same as in the case of the white key 31, and step portions for securing the space for the black key 51 are provided on the upper wall and the left and right side walls. Further, at the intermediate position in the front-rear direction on the lower surface of the white key 41, an engaging piece 41a and a pressing portion 41b having a protruding portion 41a1 similar to the engaging piece 31a and the pressing portion 31b of the white key 31 are provided.

  The rear walls of these three white keys 41 are connected to the common attachment portion 43 via the hinge portion 42, respectively. The hinge part 42 and the common attachment part 43 are integrally formed with the white key 41. The hinge part 42 and the common attachment part 43 are configured similarly to the hinge part 32 and the common attachment part 33 of the first key unit 30. The common mounting portion 43 is provided with a concave portion 43a, a convex portion 43b, a projection 43c, a through hole 43d, and a through hole 43e similar to the concave portion 33a, the convex portion 33b, the projection 33c, the through hole 33d, and the through hole 33e. Have. However, the protrusion 43c is provided at a position facing the through hole 33d of the first key unit 30 in the left-right direction, has an outer diameter substantially the same as the inner diameter of the through hole 33d, and is a common attachment portion 43 of the second key unit 40. Is fitted into the through-hole 33d when the first key unit 30 is assembled onto the common mounting portion 33. The through hole 43d is provided at an appropriate position in the left-right direction of the common attachment portion 43 (one place in the left-right direction in the present embodiment). The through-hole 43d is formed in a circular shape, and when the third key unit 50 is assembled on the second key unit 30, a later-described protrusion 53c provided on the third key unit 50 is press-fitted. Further, the hinge part 42 and the common attachment part 43 are located above the hinge part 32 and the common attachment part 33 of the first key unit 30.

  Next, the 3rd key unit 50 is demonstrated using the top view of FIG. 5 (A), and the side view of FIG. 5 (B). The third key unit 50 has five black keys 51 respectively corresponding to the pitch names C #, D #, F #, G #, and A #. The black key 51 is also composed of an upper wall, a front wall, left and right side walls, and a rear wall, and forms a rectangular space with the inside opened downward. However, the length in the front-rear direction of the black key 51 is smaller than the length in the front-rear direction of the white keys 31, 41, and the height of the black key 51 is higher than the height of the white keys 31, 41. The upper part of the front wall of the black key 51 is inclined so as to be positioned forward and downward. An engagement piece 51 a having a protruding portion 51 a 1 similar to the engagement piece 31 a of the white key 31 is provided at the front end position on the lower surface of the black key 51. Further, a pressing portion 51 b similar to the pressing portion 31 b of the white key 31 is provided at an intermediate position on the lower surface of the black key 51.

  Further, the lower surface of the rear end portion of the black key 51 is formed in a flat plate shape and a rectangular shape, and the length in the left-right direction is substantially the same as the width in the left-right direction of the black key 51. 51c is provided. When the first to third key units 30, 40, 50 are assembled to the key frame 10 and the electric circuit board 20, the protruding piece 51 c is other than the white keys 31, 41 corresponding to the E sound and the F sound. Between the adjacent white keys 31 and 41, in front of the hinge portions 32 and 42 of the first and second key units 30 and 40 from above.

  The rear walls of these five black keys 51 are connected to a common attachment portion 53 via hinge portions 52, respectively. The hinge part 52 and the common attachment part 53 are integrally formed with the black key 51. The hinge portion 52 and the common attachment portion 53 are configured in the same manner as the hinge portions 32 and 42 and the common attachment portions 33 and 43 of the first and second key units 30 and 40. And the common attachment part 53 has the recessed part 53a, the convex part 53b, the protrusion 53c, and the through-hole 53e similar to the recessed part 33a, the convex part 33b, the processus | protrusion 33c, and the through-hole 33e which were mentioned above. However, the protrusion 53c is provided at a position facing the through hole 43d of the second key unit 30 in the left-right direction, has an outer diameter that is substantially the same as the inner diameter of the through hole 43d, and the common attachment portion 53 of the third key unit 50. Is fitted into the through-hole 43d when the second key unit 40 is assembled onto the common mounting portion 43. Further, the hinge part 52 and the common attachment part 53 are located above the hinge part 42 and the common attachment part 43 of the second key unit 40.

  At appropriate positions in the left and right direction at the rear end portion of the common attachment portion 53 (in the present embodiment, two positions in the middle portion in the left and right direction), hook portions 53f are extended downward. The lower end portion of the hook portion 53f is provided with a locking claw that protrudes forward and has a flat top surface and a triangular cross section. When the first to third key units 30, 40, 50 are assembled to the electric circuit board 20, the locking claws of the hook portion 53 f are engaged with the rear end of the lower surface of the electric circuit board 20. However, when the first to third key units 30, 40, 50 and the electric circuit board 20 are fixed to the key frame 10 with male screws (not shown), the locking claw of the hook portion 53 f is the rear end of the lower surface of the electric circuit board 20. Is not engaged (ie, contacted).

  Next, the electric circuit board 20 will be described. As shown in FIG. 6, this electric circuit board 20 uses a connection board 20 </ b> A obtained by connecting a plurality of electric circuit boards 20 one by one. In this case, the length of the electric circuit board 20 in the left-right direction is 3 octaves. In the present embodiment, a connection board 20A in which three electric circuit boards 20 are connected will be described. However, the connection board 20A may be formed by connecting two or more electric circuit boards 20. . In the manufacture of the connecting substrate 20A, first, an electric wiring pattern is formed on the upper surface of the flat plate member molded by resin, and then the flat plate member on which the electric wiring pattern is formed is punched out with a mold. Form the original shape. If necessary, an electrical wiring pattern may also be formed on the lower surface of the flat plate member molded from the resin. Simultaneously with the formation of the original shape of the connecting substrate 20A by the mold, a perforation 25 is formed by punching with a die between each of a plurality of portions corresponding to the original shape of the plurality of electric circuit boards 20. The perforation 25 includes a plurality of elongated through holes (slits) 25a and thin joint portions 25b connecting the plurality of portions between adjacent through holes 25a. In this case, when the keyboard device is completed, the joint portion 25b is formed between the left and right side walls of the engagement piece 51a of the black key 51, as will be described in detail later with reference to FIG.

  Simultaneously with the formation of the original shape of the connecting substrate 20A by the mold, through holes 22a, 22b, 22c, and 22d (see FIG. 2B and FIG. 7) are also formed by punching with the mold. Keep it. Then, electrical components including the key switch 21 are mounted on the upper surface of the original shape of the connecting board 20A on which the electrical wiring pattern is formed. Thereby, the connection substrate 20A in which the plurality of electric circuit substrates 20 are connected through the perforation 25 is completed. In FIG. 6, the electrical parts including the through holes 22 a, 22 b, 22 c, 22 d, the electrical wiring pattern, and the key switch 21 are omitted. A plurality of electric circuit boards 20 are manufactured by dividing the connection board 20A manufactured in this way at the position of the perforation 25 and separating it. In addition, you may make it perform mounting | wearing of the electrical components containing the key switch 21 mentioned above after manufacture of the several electric circuit board 20 cut away at the position of the perforation 25. FIG. In the electric circuit board 20 separated in this way, when the electric circuit board 20 is cut by separating the connection board 20A, a part of the joint portion 25b of the perforation 25 remains and the electric circuit board 20 is left. It protrudes to the outside of the end face. That is, in FIG. 6, a part of the joint portion 25b remains on the lower end surface of the uppermost electric circuit board 20, and a part of the joint portion 25b remains on the upper and lower end surfaces of the electric circuit board 20 at the intermediate position. Further, a part of the joint portion 25b remains on the upper end surface of the electric circuit board 20 at the lowest position.

  The assembly of the first to third key units 30, 40, 50 and the electric circuit board 20 configured as described above to the key frame 10 will be described. First, the common attachment portion 43 of the second key unit 40 is placed on the upper surface of the common attachment portion 33 of the first key unit 30, and the second key unit 40 is assembled to the first key unit 30. In this case, the convex portion 33b of the common mounting portion 33 is fitted into the concave portion 43a of the common mounting portion 43, and the positioning projection 43c provided on the lower surface of the common mounting portion 43 is used as a positioning through hole 33d for the common mounting portion 33. Press fit into. Next, the common attachment portion 53 of the third key unit 50 is placed on the common attachment portion 43 of the second key unit 40 assembled on the first key unit 30, and the third key unit 50 is moved to the second key. Assemble to unit 40. In this case, the convex portion 43 b of the common mounting portion 43 is fitted into the concave portion 53 a of the common mounting portion 53, and the positioning projection 53 c provided on the lower surface of the common mounting portion 53 is positioned through the positioning through hole 43 d of the common mounting portion 43. Press fit into. Thereby, a keyboard composed of the first to third key units 30, 40, 50 is completed.

  Next, the electric circuit board 20 is placed on the support parts 11 and 12 with the screw through holes 22 a provided in the front part of the electric circuit board 20 aligned with the support part 11 of the key frame 10. Then, a male screw (not shown) is passed through the through hole 22 a from the upper surface of the electric circuit board 20, is inserted into the female screw provided in the support portion 11, and is screwed together, and the electric circuit board 20 is assembled to the key frame 10. The buffer members 14 and 22 are fixed in advance to the lower limit stopper portion 13 of the key frame 10 and the lower surface of the front end portion of the electric circuit board 20, respectively.

  Next, a keyboard composed of the first to third key units 30, 40, 50 is assembled on the electric circuit board 20. In this case, the protrusions 31a1, 41a1 and 51a1 of the engagement pieces 31a, 41a and 51a of the white keys 31 and 41 and the black key 51 are respectively inserted below the front end of the electric circuit board 20 to thereby enter the first key unit 30. The protruding piece 33f is passed through the through hole 22d of the electric circuit board 20. Then, the common attachment portion 33 of the first key unit 30 is placed on the rear end portion of the electric circuit board 20, and the locking claw of the hook portion 53 f of the third key unit 50 is used as the rear end portion of the electric circuit board 20. Engage with the lower surface of the. Further, the positioning projection 33 c provided on the lower surface of the common mounting portion 33 is press-fitted into the positioning through hole 22 c provided at the rear end portion of the electric circuit board 20. The screw through holes 33e, 43e, 53e provided in the common mounting portions 33, 43, 53 of the first to third key units 30, 40, 50 and the screw through holes 22b provided in the electric circuit board 20 are provided. Then, a male screw (not shown) is passed through from above, and is inserted into the female screw provided in the support portion 12 and screwed together. Thereby, the plurality of white keys 31, 41 and the black key 51 have their front end portions swingable in the vertical direction, and the electric circuit board 20 is placed on the support portion 12 at their rear end portions. Supported through. In this state, the electric circuit board 20 is positioned below the keyboard composed of the plurality of white keys 31 and 41 and the black key 51 with its upper surface facing the lower surface of the keyboard. Thereafter, the upper cover 15 is connected to a joint portion (not shown) of the key frame 10 to cover the rear end portions of the first to third key units 30, 40 and 50.

  The positions of the through holes 22a, 22b, 22c, 22d provided in the electric circuit board 20 and the joint portion 25b of the perforation 25 in the keyboard device configured as described above will be described with reference to FIG. FIG. 7 is a schematic view of the electric circuit board 20, the white keys 31, 41, and the black key 51 as viewed from below the keyboard device. 7 shows the keyboard device from the bottom, so that the left and right directions are reversed from the plan views of FIGS. 2, 3A and 6. FIG.

  As is apparent from FIG. 7, the joint portion 25b of the perforation 25 remaining on the front end surface of the electric circuit board 20 is located between the left and right side walls of the engagement piece 51 of the black key 51 and the pair of protrusions 51a1. And it is located in the back of the upper part rather than the protrusion part 51a1 in the engagement piece 51a, and above the protrusion part 51a1. When the electric circuit board 20 is incorporated in the keyboard device and the lower side of the electric circuit board 20 at the uppermost position or the intermediate position in FIG. 6 is positioned on the front side of the keyboard device (that is, the engagement piece 51a side), The joint portion 25b remaining on the end face is positioned so as to face the engagement piece 51a. However, when the lower side of the lowermost electric circuit board 20 is located on the front side of the keyboard device, the joint portion 25b remaining on the end surface does not face the engagement piece 51a. Conversely, with the electric circuit board 20 incorporated in the keyboard device, the upper side of the electric circuit board 20 at the lowest position or the intermediate position in FIG. 6 is positioned on the front side of the keyboard device (that is, the engagement piece 51a side). In this case, the joint portion 25b remaining on the end face is positioned so as to face the engagement piece 51a. However, when the upper side of the uppermost electric circuit board 20 is positioned on the front side of the keyboard device, the joint portion 25b remaining on the end surface does not face the engagement piece 51a.

  The screw through-hole 22a is located slightly behind the projecting portions 31a1, 41a1, and 51a1. The screw through-hole 22b is located at the rear of the electric circuit board 20 and opposed to the through-hole 33e of the common mounting portion 33 of the first key unit 30 indicated by a broken line. The positioning through-hole 22 c is positioned to face the positioning protrusion 33 c of the common mounting portion 33 of the first key unit 30. The through hole 22 d that allows the protruding piece 33 f of the first key unit 33 to pass therethrough is located slightly in front of the rear end face of the common attachment portion 33.

  In the keyboard device configured as described above, when the performer performs a pressing operation on the white keys 31, 41 and the black key 51, the white keys 31, 41 and the black key 51 are elastically deformed by the hinge portions 32, 42, 52. It swings around the common mounting portions 33, 43, 53, and their front end portions are displaced downward. Then, when the lower surfaces of the engagement pieces 31a, 41a, 51a of the white keys 31, 41 and the black key 51 come into contact with the upper surface of the cushioning material 14, the swinging of the white keys 31, 41 and the black key 51 is stopped. On the other hand, when the pressed white keys 31 and 41 and the black key 51 are released, the white keys 31 and 41 and the black key 51 are recovered by the restoring force of the hinge portions 32, 42 and 52 and the key switch 21. Displace the front end of the top. When the upper surfaces of the protrusions 31a1, 41a1, 51a1 of the engaging pieces 31a, 41a, 51a1 of the white keys 31, 41 and the black key 51 come into contact with the lower surface of the cushioning material 22, the white keys 31, 41 and the black key 51 Returns to the original position (key release state).

  By pressing and releasing the white keys 31 and 41 and the black key 51, the pressing unit 31b turns on and off the key switch 21 provided on the electric circuit board 20. Generation of musical tone signals corresponding to the white keys 31 and 41 and the black key 51 that have been pressed and released are controlled by turning on and off the key switch 21.

  In the keyboard device configured and operated as described above, when the perforation 25 is located on the side of the engagement pieces 31a, 41a, 51a of the white keys 31, 41 and the black key 51, the perforation 25 is connected to the joint. The portion 25b is located between the left and right side walls of the engagement piece 51a of the black key 51, and is formed so as not to face the rear surface of the engagement pieces 31a, 41a, 51a. Therefore, the front end portions of the white keys 31, 41 and the black key 51 can be swung by pressing and releasing keys without increasing the distance from the front end surface of the electric circuit board 20 to the rear surfaces of the engagement pieces 31a, 41a, 51a. Sometimes, the joint 25b of the perforation 25 remaining when the connecting board 20A is broken comes into contact with the rear surfaces of the engagement pieces 31a, 41a, 51a, and the operations of the white keys 31, 41 and the black key 51 become unstable. And no noise is generated. As a result, according to the first embodiment, the lengths of the projecting portions 31a1, 41a1, 51a1 provided on the engagement pieces 31a, 41a, 51a can be reduced, and the white including the engagement pieces 31a, 41a, 51a can be reduced. The design restrictions of the keys 31, 41 and the black key 51 are eliminated. Further, when the white keys 31, 41 and the black key 51 are assembled to the key frame 10, the protruding portions 31a1, 41a1, 51a1 of the engaging pieces 31a, 41a, 51a enter the lower surface side of the front end portion of the electric circuit board 20. The assembling efficiency of the white keys 31, 41 and the black key 51 to the key frame 10 is also improved.

b. Second Embodiment Next, a keyboard device according to a second embodiment of the present invention will be described with reference to FIG. FIG. 8 is also a schematic view of the electric circuit board 20, the white keys 31, 41, and the black key 51 as viewed from below the keyboard device. In the second embodiment, the joint portion 25b of the perforation 25 remaining on the front end surface of the electric circuit board 20 in the assembled state of the keyboard device is the left and right side walls of the engagement pieces 31a, 41a of the white keys 31, 41 and It is a position between a pair of protrusion part 31a1, 41a1, Comprising: It shall be located in the back of the upper part rather than protrusion part 31a1, 41a1 in engagement piece 31a, 41a, and above protrusion part 31a1, 41a1. In this case, when manufacturing the original form of the connecting substrate 20A shown in FIG. 6, the positions of the plurality of long through holes (slits) 25a and joint portions 25b in the perforation 25 are different from those in the first embodiment. . Since other configurations are the same as those of the first embodiment, description thereof is omitted.

  Also in the second embodiment, the joint portion 25b of the perforation 25 is located between the left and right side walls of the engagement pieces 31a and 41a of the white keys 31 and 41, respectively. When the front end of 41 and the black key 51 are swung, the joint 25b of the perforation 25 remaining when the connecting board 20A is broken comes into contact with the rear surface of the engagement pieces 31a, 41a, 51a, and the operation of the black key 51 Does not become unstable or generate noise. Therefore, the same effect as the first embodiment is expected.

  In this keyboard device, the distance between the left and right side walls of the engagement pieces 31 a and 41 a in the white keys 31 and 41 is longer than the distance between the left and right side walls of the engagement piece 51 a in the black key 51. Therefore, even if there is a slight misalignment in the left-right direction of the perforation 25, compared to the case of the first embodiment, due to the contact of the joint portions 25b of the perforation 25 with the rear surfaces of the engagement pieces 31a, 41a, Unstable operation of the white keys 31 and 41 and generation of noise are better prevented.

c. Third Embodiment Next, a keyboard device according to a third embodiment of the present invention will be described with reference to FIG. FIG. 9 is also a schematic view of the electric circuit board 20, the white keys 31, 41, and the black key 51 as viewed from below the keyboard device. In the third embodiment, the joint portion 25b of the perforation 25 on the right side of FIG. 8 in the second embodiment is eliminated, and the joint portion 25b is made one. In the assembled state of the keyboard device, the position of the joint portion 25b in the left-right direction, the positioning through-hole 22c provided in the electric circuit board 20, and the positioning protrusion 33c provided in the first key unit 30 in the left-right direction. The position was matched. Also in this case, the joint portion 25b is a position between the left and right side walls of the engagement piece 41a in the white key 41, and is behind the projection 41a1 and above the projection 41a1 of the engagement piece 41a. To be located.

  Also in this case, when manufacturing the original form of the connecting substrate 20A shown in FIG. 6, the plurality of long through holes (slits) 25a and the joint portions 25b in the perforation 25 are formed as in the case of the second embodiment. The position is different from that in the first embodiment. Further, the right joint portion 25b in FIG. 8 (the first, third and fifth joint portions 25b from the left in FIG. 6A) is eliminated, and a long through hole (slit) 25a in that portion is formed. Make it even longer.

  Further, the positions of the through holes 22b and 22c are also different from the through holes 22b and 22c of the second embodiment. Further, in this case, the left and right positions of the protrusions 33 c provided on the common mounting portion 33 of the first key unit 30 are changed to match the left and right positions of the through holes 22 c. Further, the left and right positions of some through holes 33e, 43e, and 53e provided in the common mounting portions 33, 43, and 53 of the first to third key units 30, 40, and 50 are also changed, and the left and right direction of the through hole 22b is changed. Adjust to position. Since other configurations are the same as those of the second embodiment, description thereof is omitted.

  Also in the third embodiment, since the joint portion 25b of the perforation 25 is located between the left and right side walls of the engagement piece 41a of the white key 41, the white keys 31, 41 and the black key 51 by the key release operation. When the front end of the swaying portion swings, the joint portion 25b of the perforation 25 remaining when the connecting board 20A is broken comes into contact with the rear surfaces of the engagement pieces 31a, 41a, 51a, and the white keys 31, 41 and the black key 51 The operation does not become unstable and no noise is generated. Therefore, the same effect as the second embodiment is expected.

  In addition, the lateral width error of the white key 41 may be increased to some extent due to a difference in dimensional tolerance of the second key unit 40 and molding conditions. Then, in the white key 41 far from the positioning projection 33c in the left-right direction, the left-right position is further shifted, and the possibility that the joint portion 25b contacts the rear surface of the engagement piece 41a of the white key 41 is increased. However, in the third embodiment, the position in the left-right direction of the joint portion 25b of the perforation 25 is used for positioning the first key unit 30 when the first to third key units 30, 40, 50 are assembled to the key frame 10. The protrusions 33c and the through-holes 22c for positioning the electric circuit board 20 are aligned with the left-right direction positions. Therefore, according to the third embodiment, the unstable operation of the white key 41 and the generation of noise due to the contact of the joint portion 25b with the rear surface of the engagement piece 41a are more than in the case of the second embodiment. Well prevented.

  In the third embodiment, in the assembled state of the keyboard device, the horizontal position of the joint portion 25b, the positioning through hole 22c in the electric circuit board 20, and the positioning projection 33c in the first key unit 30 are provided. The left-right direction position was matched. However, even if the horizontal position of the joint portion 25b is slightly shifted from the horizontal position of the positioning through hole 22c and the protrusion 33c, the joint portion 25b is adjacent to the positioning through hole 22c and the protrusion 33c in the horizontal direction. In this case, the same effect as that of the third embodiment is expected to some extent, though it is inferior to the case of the third embodiment. The positional deviation may be about twice or less the horizontal width of one white key 31, 41 or black key 51, for example.

  Moreover, since the through hole 22b of the electric circuit board 20 which penetrates the male screw which is not shown in figure and the through hole 33e provided in the common attachment part 33 of the 1st key unit 30 also exhibit a positioning function, the through holes 22b and 33e are used as a positioning part. The horizontal position of the joint portion 25b may be made to coincide with the horizontal position of the through holes 22b and 33e, or may be a position in the vicinity thereof.

  Moreover, in the said 3rd Embodiment, the joint part 25b is made into one, the horizontal direction position of the joint part 25b, the positioning through-hole 22c in the electric circuit board 20, and the projection 33c for positioning in the 1st key unit 30 The left-right direction position of was matched. However, a plurality of joint portions 25b are provided, and a plurality of through holes 22c and protrusions 33c are provided so that the left and right positions of the plurality of joint portions 25b are aligned with the left and right positions of the plurality of through holes 22c and protrusions 33c, respectively. It may be. Moreover, you may make the left-right direction position of the some joint part 25b into the vicinity position of the left-right direction position of the some through-hole 22c and the processus | protrusion 33c, respectively. Also by this, the effect by the third embodiment can be expected for the same reason as described above.

  Further, the configuration of the third embodiment in which the horizontal position of the joint portion 25b and the horizontal position of the positioning through-hole 22c in the electric circuit board 20 and the positioning projection 33c in the first key unit 30 are matched. The joint portion 25b can also be applied to the above-described first embodiment in which the black key 51 is positioned between the left and right side walls of the engagement piece 51a. According to this, the unstable operation of the black key 51 and the generation of noise due to the contact of the joint portion 25b with the rear surface of the engaging piece 51a are prevented more satisfactorily than in the case of the first embodiment.

d. Other Modifications Note that the keyboard device according to the present invention is not limited to the above-described embodiment, and can be implemented with appropriate modifications.

  In the first to third embodiments, the first key unit 30 having the plurality of white keys 31 is the bottom layer, the second key unit 30 having the plurality of white keys 41 is the intermediate layer, and the plurality of black keys 51 are The third key unit 50 having the uppermost layer is used. However, the order of the upper and lower layers may be changed. That is, the first key unit 30 having a plurality of white keys 31 is the uppermost layer or the middle layer, the second key unit 30 having the plurality of white keys 41 is the uppermost layer or the lowermost layer, and the first key unit 30 having the plurality of black keys 51 is provided. The three-key unit 50 may be a lowermost layer or an intermediate layer.

  Further, even if the first to third key units 30, 40, 50 are not stacked, the protruding portions 31a1, 41a1, 51a1 of the engaging pieces 31a, 41a, 51a of the white keys 31, 41 and the black key 51 can be connected to the electric circuit. Any keyboard device having any structure may be used as long as the upward swing of the front end portions of the white keys 31, 41 and the black key 51 is restricted by engaging the lower surface of the front end portion of the substrate 20. Can be applied.

  Further, in the first to third embodiments, the description of the keyboard instrument case is omitted. However, the keyboard instrument has a case that is located below and to the side of the white keys 31, 41, 51 and the upper cover 15 and separates the inside and the outside of the keyboard instrument. And the key frame 10 mentioned above may be arrange | positioned in the case, and may be comprised by the lower part of the case. That is, when the key frame 10 is disposed in the case, the key frame 10 is fixed to an upper position on the bottom wall of the case. In addition, when the case 10 is constituted by the lower part of the case, a part of the bottom wall of the case constitutes the key frame 10. In other words, the key frame 10 itself forms the lower part of the case.

DESCRIPTION OF SYMBOLS 10 ... Key frame, 11, 12 ... Support part, 20 ... Electric circuit board, 20A ... Connection board, 21 ... Key switch, 22a-22d ... Through-hole, 25 ... Perforation, 25a ... Through-hole, 25b ... Joint part, 30 ... 1st key unit, 40 ... 2nd key unit, 31, 41 ... White key, 50 ... 3rd key unit, 51 ... Black key, 31a, 41a, 51a ... Engagement piece, 31a1, 41a1, 51a1 ... Projection Part, 33, 43, 53 ... common attachment part, 33c, 43c, 53c ... projection, 33d, 33e, 43d, 43e, 53e ... through hole

Claims (6)

A plurality of keys composed of white keys and black keys formed in a long shape in the front-rear direction and supported by a support member so that the front end portion can swing in the vertical direction;
A substrate formed in a flat plate shape and disposed so as to face the lower surfaces of the plurality of keys;
Each of the plurality of keys has an engagement piece that extends downward from the lower surface of the plurality of keys and has a protruding portion that protrudes rearward from the lower end portion.
The front end portion of the substrate is positioned behind the upper portion of the engaging piece and above the protruding portion, and the plurality of keys are engaged by the engagement of the protruding portion with the lower surface of the front end portion of the substrate. In the keyboard device that regulates the upward displacement of the front end of the
A single substrate obtained by dividing a connection substrate obtained by connecting a plurality of substrates through perforations at the perforation position, and the perforation is located on the engagement piece side of the plurality of keys. A keyboard device, wherein a single substrate on which the perforation is formed so that a joint portion of the perforation does not face the engagement piece is used as the fixed substrate.   The keyboard device according to claim 1, wherein the fixed board includes an electric wiring pattern and a key switch. The engagement piece has left and right side walls extending downward from the lower surfaces of the plurality of keys,
The keyboard device according to claim 1, wherein the protruding portion protrudes rearward from a lower end portion of the left and right side walls.   4. The keyboard device according to claim 3, wherein a joint portion of the perforation is located between right and left side walls of an engagement piece provided on the white key or the black key.   The keyboard device according to claim 3, wherein a joint portion of the perforation is located between right and left side walls of an engagement piece provided on the white key.   The left-right direction position of the joint part of the perforation is set in the vicinity of the left-right direction position of the positioning part of the plurality of keys when the plurality of keys are supported by the support member. The keyboard device according to one.

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