JP2009145565A - Electronic keyboard musical instrument - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electronic keyboard musical instrument for obtaining key touch feeling of weightyness without becoming large-sized. <P>SOLUTION: In the electronic keyboard musical instrument, keys 10 are supported by a frame 20 so that front ends of the keys 10 are swung by arranging the pushed and separated keys 10 above the frame 20; hammers 40 are supported by the frame 20 so that rear ends of the hammers 40 are swung by arranging the hammers below the frame 20; rear end part of the hammers 40 are protruded upward from an opening part 24 and below the keys 10 by providing the opening part 24 in a part facing rear end side parts of the hammers 40 in the frame 20; and a rib-like sidewall 25 extending rightward and leftward, forward and rearward of a part providing the opening part 24 is provided on a lower face of the frame 20. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an electronic keyboard instrument including a mass body for obtaining a sense of pressing key with a heavy feeling, such as an electronic organ or an electronic piano.

In an acoustic piano, there is a feeling of key touch with a sense of mass when the key is pressed. In order to simulate this key touch sensation even in a keyboard device of an electronic musical instrument, various devices have been conventionally made. For example, Patent Document 1 below discloses a keyboard device for an electronic musical instrument having a mass body made of a hammer that gives a feeling of mass when the key is depressed by swinging in conjunction with a key. With this electronic musical instrument keyboard device, a key touch sensation similar to that of an acoustic piano can be obtained by swinging the mass body. In such a keyboard device, the mass body needs a certain weight and an angle for swinging. In the above-described keyboard device for an electronic musical instrument, the mass body is made of a rod-shaped metal material having a predetermined length. It is composed of a mass concentrating part and a resin part having a swinging supported part, and the rear end of the mass body extends rearward from the rear end of the key.
Japanese Patent No. 2917863

  However, in the conventional electronic musical instrument keyboard device described above, the rear end of the mass body extends rearward from the rear end of the key, so that the depth of the keyboard device becomes longer and the keyboard device becomes larger.

  The present invention has been made to cope with such a problem, and an object thereof is to provide an electronic keyboard instrument that can obtain a heavy key touch feeling without increasing the size.

  In order to achieve the above-described object, the structural features of the electronic keyboard instrument according to the present invention include a key that is operated by pressing and releasing, and a key that is arranged below the key so that the front end of the key swings. An electronic keyboard instrument comprising a frame that is disposed below the frame and supported by the frame so that the end swings, and is open to a portion of the frame facing the end of the mass body This is because when the end of the mass body moves upward, it projects above the opening and below the key.

  In the above-described electronic keyboard musical instrument according to the present invention, the opening is provided in a portion of the frame that faces the end of the mass body. Therefore, when the end of the mass body moves upward, it projects upward from the opening. Thereby, the length of the mass body can be shortened. In this case, by configuring the mass body to swing in conjunction with the key to be pressed, an excellent key touch feeling with a heavy feeling can be obtained.

  For example, for an electronic keyboard instrument, a drive unit that extends downward is provided at the front end side portion and is operated to push and release, and a frame that is disposed below the key and supports the key so that the front end of the key swings An electronic keyboard instrument comprising a mass body disposed below the frame and supported by the frame so that the rear end swings when a key pressing / releasing key operating force is transmitted to the front end via the drive unit Can be configured. Then, an opening is provided in a portion of the frame facing the rear end portion of the mass body so that when the rear end portion of the mass body moves upward, it projects above the opening and below the key. can do.

  According to this, since the opening is located at the portion of the frame that faces the rear end portion of the mass body, when the front end side of the key is moved downward by the key pressing operation, the front end portion of the mass body is pressed downward by the drive unit. Then, the rear end portion of the mass body moves upward and protrudes upward from the opening. As a result, even if the length of the mass body is shortened and the electronic keyboard instrument is made small, the rocking angle of the mass body can be increased, so that an excellent key touch feeling with a heavy feeling can be obtained. In this case, it is preferable to provide a stopper or the like so as not to contact the key even if the rear end portion of the mass body is raised. The mass body is supported on the lower surface of the frame so as to be swingable with a portion on the rear side slightly from the front end as a fulcrum, and the key drive portion is engaged with the front end portion. Thus, the key pressing / releasing key operating force is transmitted to the mass body.

  Another structural feature of the electronic keyboard musical instrument according to the present invention resides in that rib-shaped side walls extending in the front-rear direction are provided on the left and right of the portion where the opening of the frame is provided. According to this, even if the opening is provided in the frame, the strength of the frame can be maintained because the side wall is in the vicinity of the opening. Further, since the side walls are arranged on the left and right of the opening and extend in the front-rear direction, the mass body does not hinder the rocking of the mass body. In this case, it is preferable that the rib-shaped side wall is provided in a portion where the opening is provided on the lower surface of the frame.

  Still another structural feature of the electronic keyboard instrument according to the present invention is that the key is configured by connecting the front end side portion and the connecting member, and the connecting member is disposed above the opening, thereby providing an end of the mass body. This is because the part can enter the space formed below the connecting member. According to this, the rocking angle of the mass body can be further increased. In addition, it is preferable that a connection member is comprised by an elongate board body and is connected to the upper surface of a front-end side part.

  Further, in the electronic keyboard instrument according to the present invention, the frame is arranged with a key disposed on the left and right sides of the key support portion on the rear side that supports the key, the mass support portion on the front side that supports the mass body, and left and right. A plurality of rib-shaped side walls connecting the support part and the mass body support part can be formed, and an opening can be formed by the key support part, the mass body support part, and the side wall. According to this, since a key support part and a mass body support part are each comprised with a stable base member, and both base members can be connected with a side wall, a flame | frame can be made high intensity | strength. Further, the frame can be integrally formed by connecting the key support portion and the mass support portion with the side wall.

  Furthermore, in the electronic keyboard instrument according to the present invention, the key support portion is composed of a bottom surface portion, a front wall formed on the front edge portion of the bottom surface portion, and a rear wall formed on the rear edge portion of the bottom surface portion. The key can be supported on the rear wall. According to this, a front wall comes to be connected to a mass body support part via a side wall, and the structure of the metal mold | die used when integrally forming a flame | frame can be made into a simple structure. Also, the rigidity of the frame can be ensured.

  In the electronic keyboard instrument according to the present invention, the key support portion can be constituted by a vertical wall portion and a horizontal portion formed at the rear edge portion of the vertical wall portion, and the key can be supported by the horizontal portion. According to this, the structure of the mold used when the frame is integrally formed can be further simplified. Also, the rigidity of the frame can be ensured. Further, the key is configured by connecting the separated upper ends of the front end side portion and the rear end side portion with a connecting member, and disposing the connecting member above the opening, whereby the rear end of the mass body The side portion may be allowed to enter a space formed by the front end side portion, the rear end side portion of the key, and the connection member.

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows an electronic keyboard instrument A according to the embodiment. This electronic keyboard instrument A forms a keyboard composed of a plurality of white keys 10 and black keys 10 arranged in the left-right direction on the front side on the upper surface, and selects the operation mode of the electronic keyboard instrument A on the rear side on the upper surface. For this purpose, a plurality of panel switches PSW are provided. As shown in FIG. 2A, the plurality of keys 10 are assembled to a frame 20 integrally formed of synthetic resin. FIG. 2B shows a part of the plane of the frame 20, and the frame 20 is fixed on the support base 30.

  The frame 20 includes a planar upper surface portion 21 disposed in parallel with the upper surface of the support table 30 at a distance above the support table 30, and a front edge portion and a rear edge portion of the upper surface portion 21. And a vertical wall portion 22 extending slightly inclined so as to spread forward and backward toward the upper surface of 30. A plurality of horizontal lower edges 22a formed at the lower front part of the front vertical wall 22 and a plurality of horizontal lower edges 22a formed at the lower rear part of the rear vertical wall 22 are provided. The fixing screw 23 is fixed to the support base 30. A plurality of openings 24 extending in the front-rear direction are formed side by side at the same center as that of the key 10 in the front-rear direction of the upper surface portion 21 (up and down in FIG. 2B).

  In addition, rib-like side walls 25 extending from the lower surface of the upper surface portion 21 toward the upper surface of the support base 30 are formed on both sides of each opening portion 24 except for the opening portions 24 at both left and right ends on the lower surface of the upper surface portion 21. ing. The side wall 25 has a trapezoidal shape in which the lower part is narrower than the upper part in a side view, and the upper part is approximately twice the length of the opening 24 in the front-rear direction. ing. A plurality of insertion holes 26 having substantially the same width in the left-right direction as the opening 24 and having a shorter length in the front-rear direction than the opening 24 are provided in a portion slightly rearward from the front end of the upper surface portion 21. And the same position as the opening 24 in the left-right direction.

  A bar-shaped key guide 27 extending upward is provided on the rear side of each insertion hole 26 on the upper surface of the upper surface portion 21. Also, at the rear end portion of the upper surface portion 21, a plurality of bearings 28 provided with shaft holes by shifting the positions of the opening 24, the insertion hole 26 and the key guide 27 in the left-right direction are left and right at the same intervals as the opening 24 and the like. It is provided side by side. A bar-like support member 29 extending downward is provided on the rear side of the key guide 27 on the lower surface of the upper surface portion 21. A support shaft 29 a extending to the right is formed on the lower right side surface of the support member 29.

  The key 10 is integrally formed of synthetic resin so that the lower part is opened and the cross section perpendicular to the longitudinal direction is U-shaped. Further, a support shaft 11 extending in the left-right direction is provided at the rear end portion of the key 10. The key 10 is supported by the frame 20 with the support shaft 11 passing through the shaft hole of the bearing 28, with the support shaft 11 serving as a fulcrum, and a front end portion being swingable up and down. A key guide 27 is inserted into the front end portion of the key 10 from below, and the front end portion of the key 10 is guided by the key guide 27 when the key is depressed and is displaced vertically. Further, on the lower surface near the front end portion of the key 10, a drive portion 12 extending substantially vertically downward is integrally formed. The drive unit 12 is formed to have a U-shaped horizontal section with the rear open, and the lower end is closed. The drive unit 12 extends through the insertion hole 26 and below the upper surface portion 21.

  A hammer 40 as a mass body of the present invention is provided below the upper surface portion 21, and the hammer 40 is assembled to the key 10 via the drive unit 12. The hammer 40 includes a lever base 41 made of synthetic resin and a metal mass 42. The lever base 41 is formed in a long and flat shape, and is disposed below the front portion of the key 10 with the longitudinal direction being the front-rear direction and the plate surface being vertical, and is provided on the side surface on the rear side. A support shaft 29a is inserted into the shaft hole and supported by the support member 29 so as to be swingable. In addition, a pair of projecting pieces 41a and 41b which are divided into two portions with a space in the vertical direction are formed on the front end portion of the lever base 41, and the projecting piece 41a located above is formed shorter than the projecting piece 41b located below. Has been.

  The lower end wall of the drive unit 12 enters between the projecting pieces 41a and 41b and engages with the projecting pieces 41a and 41b. Thus, when the key 10 is released, the front end of the key 10 is displaced upward due to the upward displacement of the front end of the hammer 40 due to its own weight. On the other hand, when the key 10 is depressed, the lower end wall of the drive unit 12 presses the protruding piece 41b, and the front end portion of the hammer 40 is displaced downward. The mass portion 42 is configured by joining a rear end of the metal rod 42a to a metal block 42b having a substantially triangular side view. The mass base 42 is integrated with the lever base 41 by outsert molding of the lever base 41 on the outer periphery of the front portion. Is assembled. When the key 10 is depressed, the mass portion 42 is displaced upward as shown by a two-dot chain line in FIG. 2A, and a part of the metal lump 42b passes through the opening 24 and projects upward. .

  Each mass portion 42 has a different weight by changing the size of the metal lump 42b. That is, in both the white key 10 and the black key 10, the metal lump 42b is reduced for each key from the low sound side to the high temperature side, and the weight of the mass part 42 is increased as the sound key is low. Further, regarding the adjacent white key 10 and black key 10, the metal block 42 b of the black key 10 is replaced with the metal block of the white key 10 in order to avoid a difference in reaction force against the key pressed due to the difference in key pressing position. It is smaller than 42b.

  A long upper limit stopper 43a made of an impact absorbing material such as felt is fixed to the front end of the upper surface 21 of the frame 20 so as to extend in the lateral direction of the keyboard. Further, a long upper limit stopper 43b made of a shock absorbing material such as felt is fixed to a portion of the upper surface of the support base 30 below the driving unit 12 so as to extend in the lateral direction of the keyboard. A long upper limit stopper 43c made of a shock absorbing material such as felt is also extended and fixed to the portion along the front edge of the opening 24 on the lower surface of the upper surface portion 21. ing.

  The upper limit stopper 43a regulates the upward displacement of the rear end portion of the hammer 40 by restricting the downward displacement of the key 10 when the key is depressed. The upper limit stopper 43b restricts the upward displacement of the rear end portion of the hammer 40 by restricting the downward displacement of the drive unit 12 through the protruding piece 41b when the key is depressed. The upper limit stopper 43c restricts the upward displacement of the rear end portion of the hammer 40 by restricting the upward displacement of the metal rod 42a of the mass portion 42 when the key is depressed.

  The upper limit stoppers 43a, 43b, and 43c are installed so as to be in contact with predetermined portions of the key 10 and the hammer 40 by slightly shifting the timing, thereby distributing the force applied to the key 10, the frame 20, and the like. . Further, a long lower limit stopper 44 made of an impact absorbing material such as felt is fixed to the portion of the upper surface of the support base 30 below the metal block 42b, extending in the lateral direction of the keyboard. . The lower limit stopper 44 restricts the upward displacement of the front end portion of the key 10 when the key is released by restricting the downward displacement of the metal block 42b of the hammer 40.

  Further, a printed circuit board 46 in which a plurality of key switches 45 are assembled is extended in the keyboard lateral direction near the front edge of the opening 24 on the upper surface of the upper surface 21. A switch driving unit 13 that protrudes downward is formed in a portion of the lower surface of the key 10 that faces the key switch 45. Although not shown, three sets of electrical contacts are provided facing each other at different intervals between each key switch 45 and the printed circuit board 46. When the key 10 is depressed, the three electrical contacts are sequentially turned on as the switch drive unit 13 is moved downward. When the key 10 is released, the three electrical contacts are turned on. And turn off in the reverse order.

  Although not shown, the electronic keyboard instrument A includes a musical tone signal generating circuit, and signals from the plurality of key switches 45 are supplied to the musical tone signal generating circuit. The musical tone signal generating circuit generates musical tone signals according to the on / off states of the three sets of electrical contacts provided between each key switch 45 and the printed circuit board 46 and the time during which the state of each electrical contact changes. That is, the musical tone signal generation circuit detects the state of the three sets of electrical contacts that are turned on / off by pressing and releasing the key 10 and the key pressing speed. The detected state of the three sets of electrical contacts and the key pressing speed are used for the generation and termination of the musical tone signal and the control of the volume and tone color of the generated musical tone signal.

  Next, the operation of the electronic keyboard instrument A according to the first embodiment configured as described above will be described. In a state where the key 10 is not depressed, the metal block 42b of the hammer 40 is in contact with the lower limit stopper 44 due to its own weight. When the key 10 is pressed in this state, the key 10 starts to rotate counterclockwise in the state of FIG. 2A with the support shaft 11 at the rear end against the dead weight of the mass portion 42 of the hammer 40. When the key 10 is depressed to a predetermined depth, the lower surface of the front end side of the key 10 comes into contact with the upper limit stopper 43a, and the downward displacement of the front end portion of the key 10 is restricted. Further, the protrusion 41b of the hammer 40 contacts the upper limit stopper 43b and the metal bar 42a of the hammer 40 contacts the upper limit stopper 43c according to the strength of the key depression.

  At this time, as indicated by a two-dot chain line in FIG. 2A, a part of the metal lump 42 b of the mass part 42 passes through the opening 24 and protrudes above the upper surface part 21. In addition, the player can get a feeling of mass like playing an acoustic piano. Further, as the key 10 rotates, the switch driving unit 13 presses the key switch 45 and turns on the three sets of electrical contacts of the key switch 45 in order. When the key 10 is released, the hammer 40 rotates clockwise with the support shaft 29a as a fulcrum in the state shown in FIG. 2A until the metal block 42b of the mass portion 42 abuts against the lower limit stopper 44. To return to the home position. In response to such key pressing / release operation of the key 10, the tone signal generating circuit generates a tone signal. The musical tone signal generating circuit controls the volume and tone color of the generated musical tone signal according to the detected key pressing speed.

  As described above, in the electronic keyboard instrument A according to the present embodiment, the opening portion 24 is provided in the upper surface portion 21 of the frame 20, and the metal lump 42 b of the hammer 40 is released from the opening portion 24 when the key 10 is depressed. It protrudes upward. For this reason, the swing angle of the hammer 40 can be increased, and an excellent key touch feeling with a heavy feeling can be obtained. Further, since the length of the hammer 40 can be shortened, the electronic keyboard instrument A can be reduced in size by reducing the depth. Further, since the side walls 25 are provided on the left and right sides of the opening 24 on the lower surface of the upper surface portion 21, the strength of the frame 20 can be maintained even if a plurality of openings 24 are provided on the upper surface portion 21.

(Second Embodiment)
FIG. 3A shows a cross section of an electronic keyboard instrument according to the second embodiment of the present invention, and FIGS. 3B and 3C show a frame 50 provided in the electronic keyboard instrument. In this electronic keyboard instrument, the frame 50 includes a hammer support portion 51 located at the front portion, a key support portion 56 located at the rear portion, and a plurality of side walls 55 connecting the hammer support portion 51 and the key support portion 56. It is configured. The hammer support portion 51 is a flat upper surface portion 51a that is disposed on the upper side of the support base 30a and extends leftward and rightward, and extends slightly inclined forward from the front edge of the upper surface portion 51a toward the upper surface of the support base 30a. A front wall portion 52a and a rear wall portion 52b extending slightly inclined rearward from the rear edge portion of the upper surface portion 51a toward the upper surface of the support base 30a are provided.

  And the horizontal lower edge part 53a formed in the lower end front part of the front wall part 52a and the horizontal lower edge part 53b formed in the lower end rear part of the rear wall part 52b are respectively by several fixing screws 23a. It is fixed to the support base 30a. A plurality of hammer installation openings 54 extending from the lower end of the upper surface portion 51a to the rear end of the lower edge portion 53b are formed on the rear wall portion 52b and the lower edge portion 53b at regular intervals on the left and right. A support shaft 54a extending toward the right side (lower side in FIG. 3C) is formed on the left inner surface of the hammer installation opening 54 in the rear wall portion 52b.

  A plurality of insertion holes 26a having substantially the same width in the left-right direction as the hammer installation opening 54 are at the same interval as the hammer installation opening 54 at the center in the front-rear direction of the upper surface portion 51a, and the positions in the left-right direction are used for hammer installation. It is formed in the same manner as the opening 54. A bar-shaped key guide 27a extending upward is provided on the front surface side of each insertion hole 26a on the upper surface of the upper surface portion 51a. A printed circuit board 46a in which a plurality of key switches 45a are assembled is extended in the keyboard lateral direction in the vicinity of the rear edge of the upper surface of the upper surface 51a.

  The key support portion 56 extends from the front edge portion of the upper surface portion 56a to the upper surface of the support table 30a with a slight inclination forward from the front edge portion of the upper surface portion 56a. A front wall portion 57a and a rear wall portion 57b extending slightly inclined rearward from the rear edge portion of the upper surface portion 56a toward the upper surface of the support base 30a are provided. And the horizontal lower edge part 58a formed in the lower end front part of the front wall part 57a and the horizontal lower edge part 58b formed in the lower end rear part of the rear wall part 57b are respectively by the some fixing screw 23a. It is fixed to the support base 30a. A plurality of bearings 28a are provided at the rear end portion of the upper surface portion 56a with a space left and right.

  The side wall 55 has the same shape as the side wall 25 described above, and is arranged at the same interval as the hammer installation opening 54 and the like, and the rear wall portion 52b of the hammer support portion 51 and the front wall portion 57a of the key support portion 56 Is connected. This frame 50 is also integrally formed of synthetic resin. In this electronic keyboard instrument, the opening according to the present invention is configured at the upper end of the space formed by being surrounded by the rear wall 52b of the hammer support 51, the front wall 57a of the key support 56 and the side wall 55. . The key 10a is installed in a state in which a driving unit 12a having the same shape as the driving unit 12 is extended downward through the insertion hole 26a, and the switch driving unit 13a is opposed to the key switch 45a.

  The hammer 40a is swingably supported by the support shaft 54a, and the key 10a is swingably supported by the bearing 28a. And as an upper limit stopper, only the upper limit stopper 43d located under the drive part 12a in the upper surface of the support stand 30a is provided. About the structure of the other part of the electronic keyboard musical instrument which concerns on 2nd Embodiment, it is the same as the corresponding part of the electronic keyboard musical instrument A mentioned above. Accordingly, the same parts are denoted by the same reference numerals and the description thereof is omitted.

  According to the electronic keyboard instrument according to the second embodiment, the hammer support portion 51 and the key support portion 56 can be formed firmly, and the swinging hammer 40a and the key 10a are respectively connected to the hammer support portion 51 and the key. The support part 56 can be separated and stably supported. Further, the strength of the frame 50 itself can be maintained by connecting the hammer support portion 51 and the key support portion 56 with a plurality of side walls 55. Other functions and effects of the electronic keyboard instrument according to this embodiment are the same as those of the electronic keyboard instrument A described above.

(Third embodiment)
FIG. 4A shows a cross section of an electronic keyboard instrument according to a third embodiment of the present invention, and FIGS. 4B and 4C show a frame 60 provided in the electronic keyboard instrument. In this electronic keyboard instrument, the frame 60 includes a hammer support portion 61 located at the front portion, a key support portion 66 located at the rear portion, and a plurality of side walls 65 connecting the hammer support portion 61 and the key support portion 66. It is configured. The hammer support portion 61 includes a planar upper surface portion 61a that is disposed above the support base 30b and extends to the left and right, and a vertical wall portion 62 that extends directly from the front edge of the upper surface portion 61a toward the upper surface of the support base 30b. It has.

  And the horizontal lower edge part 62a formed in the lower end front part of the vertical wall part 62 is being fixed to the support stand 30b with the some fixing screw 23b. A plurality of hammer installation openings 64 extending from the lower end of the upper surface portion 61a to the front end of the lower edge portion 62a are formed in the vertical wall portion 62 and the lower edge portion 62a at regular intervals on the left and right. And the support shaft 64a extended toward the right side (lower side in FIG. 4C) is formed in the left inner surface of the opening 64 for hammer installation in the vertical wall part 62, respectively. A bar-shaped key guide 27b extending upward is provided at the front end portion on the upper surface of the upper surface portion 61a. Further, a printed circuit board 46b in which a plurality of key switches 45b are assembled is extended in the lateral direction of the keyboard at the center of the upper surface of the upper surface portion 61a in the front-rear direction.

  The key support portion 66 is slightly inclined forward and upward from the front edge portion of the bottom surface portion 67a, and a flat bottom surface portion 67a that is fixed to the upper surface of the support base 30b by a plurality of fixing screws 23b. And a rear wall portion 67c extending slightly inclined rearward from the rear edge portion of the bottom surface portion 67a upward. A horizontal upper surface portion 66a extending rearward is provided at the upper end portion of the rear wall portion 67c. A plurality of bearings 28b are provided at intervals on the upper surface of the upper surface portion 66a.

  The side wall 65 is disposed at the same interval as the hammer installation opening 64 and the like, and the rear surface of the vertical wall portion 62 of the hammer support portion 61 and the lower surface and the rear end surface of the upper surface portion 61a are connected to the front wall portion 67b of the key support portion 66. Connected to the front. Further, a notch portion having a substantially trapezoidal shape in a side view is provided at the lower portion of the side wall 65. This frame 60 is also integrally formed of synthetic resin, and the structure of the hammer support portion 61 is simplified, and a cut-out portion is provided in the side wall 65, so that a small amount of synthetic resin is used.

  In this electronic keyboard instrument, an opening according to the present invention is formed by a space portion formed by being surrounded by the upper surface portion 61a of the hammer support portion 61, the upper edge portion of the front wall portion 67b of the key support portion 66, and the upper edge portion of the side wall 65. Is configured. The key 10b is installed in a state in which a drive unit 12b having the same shape as the drive unit 12 extends downward in front of the hammer support unit 61 and the switch drive unit 13b faces the key switch 45b. The hammer 40b is swingably supported by the support shaft 64a, and the key 10b is swingably supported by the bearing 28b. And as an upper limit stopper, only the upper limit stopper 43e located in the upper surface rear edge part of the upper surface part 61a is provided. The configuration of the other parts of the electronic keyboard instrument according to the third embodiment is the same as the corresponding part of the electronic keyboard instrument A described above. Accordingly, the same parts are denoted by the same reference numerals and the description thereof is omitted.

  According to the electronic keyboard instrument according to the third embodiment, since the structure of the frame 60 is simple, the structure of the mold used when integrally molding the frame 60 can be made simple and the synthetic resin used. Can be made small. Further, since the side wall 65 is connected not only to the vertical wall portion 62 of the hammer support portion 61 and the front wall portion 67b of the key support portion 66, but also to the upper surface portion 61a of the hammer support portion 61, the structure of the frame 60 is improved. The rigidity can be secured while simplifying. Other functions and effects of the electronic keyboard instrument according to this embodiment are the same as those of the electronic keyboard instrument A described above.

(Fourth embodiment)
FIG. 5A shows a cross section of an electronic keyboard instrument according to the fourth embodiment of the present invention, and FIGS. 5B and 5C show a frame 70 provided in the electronic keyboard instrument. In this electronic keyboard instrument, the frame 70 includes a hammer support portion 71 located at the front portion, a key support portion 76 located at the rear portion, and a plurality of side walls 75 connecting the hammer support portion 71 and the key support portion 76. It is configured. The hammer support portion 71 is a flat upper surface portion 71a that is disposed above the support base 30c and extends leftward and rightward, and extends slightly inclined backward from the rear edge of the upper surface portion 71a toward the upper surface of the support base 30c. And a vertical wall 72.

  And the horizontal lower edge part 72a formed in the lower end rear part of the vertical wall part 72 is being fixed to the support stand 30c with the some fixing screw 23c. The vertical wall portion 72 and the lower edge portion 72a are formed with a plurality of hammer installation openings 74 extending from the lower end of the upper surface portion 71a to the rear end of the lower edge portion 72a at a constant interval on the left and right. A support shaft 74a extending toward the right side (lower side in FIG. 5C) is formed on the left inner side surface of the hammer installation opening 74 in the vertical wall portion 72. A printed board 46c in which bar-like key guides 27c extending upward are provided at the front part of the upper surface of the upper surface part 71a with a space left and right, and a plurality of key switches 45c are assembled to the rear part of the upper surface of the upper surface part 71a. It extends in the horizontal direction of the keyboard.

  The key support portion 76 extends in a slightly inclined frontward direction from the front edge portion of the upper surface portion 76a toward the upper surface of the support table 30c. And a vertical wall 77. And the horizontal lower edge part 77a formed in the lower end front part of the vertical wall part 77 is being fixed to the support stand 30c with the some fixing screw 23c. A plurality of bearings 28c are provided on the rear end portion of the upper surface portion 76a with a space left and right.

  The side wall 75 is disposed at the same interval as the hammer installation opening 74 and the like, and connects the vertical wall portion 72 of the hammer support portion 71 and the vertical wall portion 77 of the key support portion 76. Further, a notch portion extending in the front-rear direction is provided in the central portion of the upper portion and the lower portion of the side wall 75. A plurality of substantially triangular ribs 75 a are formed at portions corresponding to the side walls 75 in the rear portion of the key support portion 76 surrounded by the upper surface portion 76 a and the vertical wall portion 77. This frame 70 is also integrally formed of synthetic resin, and is used by simplifying the structure of both the hammer support portion 71 and the key support portion 76 and providing notches at the upper and lower portions of the side wall 75 respectively. The amount of the synthetic resin is further smaller than that of the frame 60 in the third embodiment.

  In this electronic keyboard instrument, the opening according to the present invention is constituted by a space portion surrounded by the vertical wall portion 72 of the hammer support portion 71, the vertical wall portion 77 of the key support portion 76, and the upper edge portion of the side wall 75. Is done. Further, as the upper limit stopper, only the upper limit stopper 43f positioned in front of the hammer support portion 71 on the upper surface of the support base 30c is provided. About the structure of the other part of the electronic keyboard musical instrument which concerns on 4th Embodiment, it is the same as the corresponding part of the electronic keyboard musical instrument which concerns on 3rd Embodiment mentioned above. Accordingly, the same parts are denoted by the same reference numerals and the description thereof is omitted.

  According to the electronic keyboard instrument according to the fourth embodiment, the structure of the mold used when integrally molding the frame 70 is further simplified as compared with the electronic keyboard instrument according to the third embodiment described above. And a smaller amount of synthetic resin can be used. Further, since the rib 75a is provided at the rear portion of the key support portion 76, the rigidity of the frame 70 can be ensured while simplifying the structure. Other functions and effects of the electronic keyboard instrument according to this embodiment are the same as those of the electronic keyboard instrument according to the third embodiment described above.

(Fifth embodiment)
FIG. 6A shows a cross section of an electronic keyboard instrument according to the fifth embodiment of the present invention, and FIGS. 5B and 5C show a frame 80 included in the electronic keyboard instrument. In this electronic keyboard instrument, the frame 80 includes a hammer support portion 81 located at the front portion, a key support portion 86 located at the rear portion, and a plurality of side walls 85 connecting the hammer support portion 81 and the key support portion 86. It is configured. The hammer support portion 81 is disposed above and below the support base 30d and extends to the left and right with a front portion higher than the rear portion. The hammer support portion 81 extends from the front edge of the upper surface portion 81a toward the upper surface of the support base 30d. Connected to the rear edge portion of the upper surface portion 81a via the front wall portion 82a extending slightly inclined forward and the wall portion bent downward from the rear edge portion of the upper surface portion 81a and extending downward. And a bottom surface portion 82c extending rearward along.

  And the horizontal lower edge part 82b and bottom face part 82c which were formed in the lower end front part of the front wall part 82a are being fixed to the support stand 30d with the some fixing screw 23d. A plurality of hammer mounting portions 84 are provided on the upper surface of the bottom surface portion 82c at regular intervals on the left and right. The hammer mounting portion 84 is formed in a rod shape that becomes thinner from the lower portion to the upper portion, and a support shaft 84a that extends toward the right side (lower side in FIG. 6C) is formed on the left side surface thereof. A bar-shaped key guide 27 d extending upward is formed on the right side portion of the upper surface of the hammer mounting portion 84. A printed circuit board 46d having a plurality of key switches 45d assembled on the upper surface of the front portion of the upper surface portion 81a extends in the keyboard lateral direction.

  The key support portion 86 is slightly inclined forward and upward from the front edge portion of the bottom surface portion 87a, and a flat bottom surface portion 87a that is fixed to the upper surface of the support base 30d by a plurality of fixing screws 23d and extends to the left and right. And a rear wall portion 87c extending slightly inclined rearward from the rear edge portion of the bottom surface portion 87a upward. A horizontal upper surface portion 86a extending forward is provided at the upper end portion of the front wall portion 87b, and a horizontal upper surface portion 86b extending rearward is provided at the upper end portion of the rear wall portion 87c. Yes. On the upper surface of the upper surface portion 86b, a plurality of bearings 28d are provided at left and right intervals.

  The side wall 85 connects the right edge of the rear surface of the hammer mounting portion 84 and the upper surface of the bottom surface portion 82c to the front surface of the front wall portion 87b of the key support portion 86 and the upper surface portion 86a. Further, a cutout portion having an arch shape in side view is provided at the lower portion of the side wall 85. This frame 80 is also integrally formed of synthetic resin. In this electronic keyboard instrument, the opening according to the present invention is configured by a space portion surrounded by the hammer mounting portion 84, the upper surface portion 86a of the key support portion 86, and the upper edge portion of the side wall 85.

  Also, the white key 10d of the key 10 has a key front portion 15 formed to be approximately the length of the front half of the white key 10 described above and a length of only the rear end portion of the white key 10 or the like. The formed key rear portion 16 is connected by a connecting member 17 made of a metal plate. The connecting member 17 bends the front portion of the flat central portion and extends obliquely downward, then further bends and extends in the forward horizontal direction, and after bending the rear portion of the flat central portion and extends obliquely downward. Furthermore, it is bent and formed into a shape extending in the rear horizontal direction. The connecting member 17 has a front end fixed to the upper surface of the rear end of the key front portion 15 with a screw 18 and a rear end fixed to the upper surface of the front end of the key rear portion 16 with a screw 18. 16 is connected. For this reason, a space is formed on the lower surface on the rear side of the center of the key 10d.

  In this key 10d, the key guide 27d is inserted into the inside of the rear side portion slightly from the center of the key front portion 15, the drive portion 12d is extended downward in front of the hammer mounting portion 84, and the switch drive portion 13d is moved to the key switch. It is installed in a state of facing 45d. The hammer 40d is supported on the support shaft 84a so as to be swingable. And the upper limit stopper 43g is provided in the lower part of the rear part of the upper surface part 81a so as to face the drive part 12d. The configuration of the other parts of the electronic keyboard instrument according to the fifth embodiment is the same as the corresponding part of the electronic keyboard instrument A described above.

  Accordingly, the same parts are denoted by the same reference numerals and the description thereof is omitted. According to the electronic keyboard instrument according to the fifth embodiment, the swing angle of the hammer 40d can be further increased. Other functions and effects of the electronic keyboard instrument according to this embodiment are the same as those of the electronic keyboard instrument A described above. Further, as a modified example of the white key 10d, the key rear portion 16 is not used, the length of the connecting member 17 is lengthened rearward, a support shaft is provided at the rear end portion, and the bearing 28d is swingably supported. You can also.

  Further, in each of the above-described embodiments, the hammer 40 and the like are composed of the synthetic resin lever base 41 and the metal mass portion 42 as shown in FIG. The hammer 90 shown in FIG. 7B or the hammer 90a shown in FIG. 7B can be used. The hammer 90 is obtained by connecting a metal rod 91 whose tip is folded back to the tip of the lever base 41. By adjusting the length of the folded portion 92 of the metal rod 91, the weight of the tip of the hammer 90 is adjusted. . Further, the hammer 90a is obtained by connecting a metal rod 93 having a tip wound around the tip of the lever base 41, and the weight of the tip of the hammer 90a is adjusted by adjusting the winding state of the winding portion 94 of the metal rod 93. Is done.

It is a top view which shows the electronic keyboard apparatus which concerns on 1st Embodiment of this invention. It is a longitudinal cross-sectional view of the electronic keyboard apparatus shown in FIG. It is a top view of the flame | frame with which the electronic keyboard apparatus shown in FIG. 1 is provided. It is a longitudinal cross-sectional view of the electronic keyboard apparatus which concerns on 2nd Embodiment of this invention. It is a perspective view of the flame | frame with which the electronic keyboard apparatus which concerns on 2nd Embodiment is provided. 3B is a plan view of the frame shown in FIG. 3B. FIG. It is a longitudinal cross-sectional view of the electronic keyboard apparatus which concerns on 3rd Embodiment of this invention. It is a perspective view of the flame | frame with which the electronic keyboard apparatus which concerns on 3rd Embodiment is provided. FIG. 4B is a plan view of the frame shown in FIG. 4B. It is a longitudinal cross-sectional view of the electronic keyboard apparatus which concerns on 4th Embodiment of this invention. It is a perspective view of the flame | frame with which the electronic keyboard apparatus which concerns on 4th Embodiment is provided. FIG. 5B is a plan view of the frame shown in FIG. 5B. It is a longitudinal cross-sectional view of the electronic keyboard apparatus which concerns on 5th Embodiment of this invention. It is a perspective view of the flame | frame with which the electronic keyboard apparatus which concerns on 5th Embodiment is provided. FIG. 6B is a plan view of the frame shown in FIG. 6B. (A) is a side view of the hammer with which the electronic keyboard device which concerns on 1st-5th embodiment of this invention is provided, (B) and (C) are side views of the hammer which concerns on a modification.

Explanation of symbols

  10, 10a, 10b, 10d ... key, 12, 12a, 12b, 12d ... drive unit, 15 ... key front part, 16 ... key rear part, 17 ... connection member, 20, 50, 60, 70, 80 ... frame, 24 ... Openings, 25, 55, 65, 75, 85 ... Side walls, 40, 40a, 40b, 40d ... Hammer, 51, 61, 71, 81 ... Hammer support, 56, 66, 76, 86 ... Key support, A ... Electronic keyboard instrument.

Claims (3)

The key to be pressed and released,
A frame disposed below the key and supporting the key such that a front end of the key swings;
An electronic keyboard instrument comprising a mass body disposed below the frame and supported by the frame such that an end swings;
An opening is provided in a portion of the frame facing the end of the mass body so that when the end of the mass body moves upward, it protrudes above the opening and below the key. An electronic keyboard instrument characterized by this.   The electronic keyboard instrument according to claim 1, wherein rib-like side walls extending in the front-rear direction are provided on the left and right of the portion of the frame where the opening is provided.   A space in which the end of the mass body is formed below the connecting member by configuring the key by connecting a front end portion and a connecting member, and disposing the connecting member above the opening. The electronic keyboard instrument according to claim 1, wherein the electronic keyboard instrument is capable of entering inside.

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