JPH0345278Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a keyboard holding structure in an electronic keyboard musical instrument.

Conventionally, in the case of keyboards in keyboard electronic musical instruments such as electronic organs, a concave groove is provided at the end of each key, and this end is used as an opening in the rear rising part of a chassis that is separately disposed within the case body. , and an elastic member such as a spring is placed below each key, thereby pushing up each key, and inserting and arranging the concave groove provided at the end of each key into the upper side of the opening. , each key is configured to rotate around this part.

However, in the above-mentioned keyboard support structure, in addition to the upper case that makes up the case body of the keyboard instrument, the chassis that rotatably holds each key and elastic members such as springs are separate parts. In addition, a large number of steps are required to attach each key to the chassis, resulting in an increase in manufacturing costs.

This idea was devised in consideration of the above points, and its purpose is to reduce the number of assembly steps by reducing the number of parts, and to create a keyboard with low production costs. The purpose is to provide a supporting structure.

Hereinafter, one embodiment of this invention will be explained in detail based on FIGS. 1 to 5. In the figure, reference numeral 1 denotes a case body of an electronic keyboard musical instrument, and this case body 1 is composed of an upper case 1a and a lower case (not shown) made of synthetic resin. As shown in FIG. 1, on the upper case 1a, there is a keyboard section 4 consisting of a large number of white keys 2... and black keys 3... and various switches (for example, a power switch,
A switch section 5 consisting of a volume switch, memory switch, select switch, mode switch, etc.), an automatic accompaniment section 7 in which push buttons 6 for automatic accompaniment are arranged similarly to a keyboard, and a speaker section 8 that emits musical tones. are arranged respectively. In this case, the speaker section 8 has a sound emitting hole 9 in the upper case 1a, and the sound emitting hole 9 has a large number of slits 9a.
... are formed in an array, and these slits 9a...
The overall shape of the upper case 1a is square on the upper surface side, and circular on the lower surface side as shown in FIG. That is, the sound emitting hole 9 on the lower surface side of the upper case 1a has a protruding annular flange portion 10, and a lattice-like slit 9a running vertically and horizontally within the flange portion 10, and these slits 9a... It has a structure in which an adhesive part 11 is formed between the flange part 10 and the flange part 10. This sticking part 11 is used to particularly firmly stick the periphery of a saran net (not shown) when it is pasted.

Further, as shown in FIGS. 3 and 4, the upper case 1a is constructed by forming a synthetic resin flat plate into a step shape in the middle, thereby forming a lower part 13 and an upper part 1.
4 and a rising portion 15. That is, white keys 2 and black keys 3 are arranged on the lower section 13, and a switch section 5 is arranged on the upper section 14. Further, the rising portion 15 includes white key openings 16 into which the rear end portions 2a of the white keys 2 are inserted, and black key openings into which the rear end portions 3a of the black keys 3 are inserted. 17... are formed. In this case, white key 2
...Each rear end portion 2a... is formed to have the same width as the middle width of the white key 2, and furthermore, an arc-shaped groove 18 is formed in the width direction on its upper surface, and on its lower surface. Arc-shaped convex portion 1 concentrically with the groove 18
9 is formed. Further, each rear end portion 3a of the black key 3 is formed to have a width smaller than the middle width of the black key 3, and has a concave groove 20 and a convex portion similar to the white key 2 on the upper and lower surfaces. 21 are formed. Therefore, each of the openings 16..., 17... is formed in a size corresponding to the rear end portions 2a..., 3a... of each key 2..., 3.... Furthermore, each key 2...
When inserted into the respective openings 16..., 17..., the concave grooves 18..., 20... formed in the holding part 2
It is designed to fit into 2. That is, this holding part 22 is provided vertically from the upper part 14 of the upper case 1a toward each groove 18..., 20..., and its lower end has the same curvature as each groove 18..., 20... It is formed in a convex arc shape. Also, each key 2
Each convex portion 19..., 21... formed in..., 3... is
It is pushed up and held by a holding plate 23 which is a holding member. That is, the holding plate 23 is a metal plate bent into a substantially "Z" shape, and its lower part is attached to the lower surface of the lower part 13 of the upper case 1a with screws 24.
It is attached by. Therefore, each key 2
..., 3... are supported by the holding part 22 and the holding plate 23, and are configured to rotate in the vertical direction around the lower end of the holding part 22.

Further, in the lower part 13 of the upper case 1a, circular through holes 26 are formed at positions corresponding to the pressing parts 25 formed in the middle of the black keys 3. In this through hole 26, an elastic bulging member 27, which is an inverted bowl-shaped elastic sheet, is inserted from below and protrudes upward. By cutting out the portions, relief portions 26a are formed respectively. When the elastic bulging member 27 is pressed by the pressing portion 25, the escape portion 26a
This is to allow good elastic deformation of the material. In addition, the bottom surface of each pressing portion 25 of the black key 3 is as follows:
An inclined surface 28 is formed that rises toward the tip end of the key 3 (left side in the figure). This is because when the black key 3 is pressed, the inclined surface 28 gradually becomes a horizontal surface, and the elastic bulging member 27 is pushed down vertically.

In addition, black key guide protrusions 29 and stopper holes 30 are formed in front of the through holes 26 in the lower part 13 of the upper case 1a (on the left side in the figure). The black key guide protrusion 29 is
It is provided to protrude above the lower part 13, and
It is inserted into each hollow part 31 of the black keys 3 and thereby guides the vertical movement of the black keys 3 and prevents the black keys 3 from swinging laterally. The stopper holes 30 are rectangular holes formed in the lower part 13 in front of the black key guide protrusion 29, and the stopper holes 30 are rectangular holes formed in the lower part 13 in front of the black key guide protrusion 29.
The stopper portions 32 provided on one side of the distal end of the stopper holes 30 are respectively inserted, and the stopper portions 32 are engaged with the lower hole edges of the stopper holes 30. That is, the stopper portion 32 regulates the upper limit position of the black key 3, and in this case, the stopper hole 30
...A concave groove 33 is formed upward near the edge of the lower hole, and a cushioning material 34 such as felt is pasted inside this groove 33. This buffer material 34 absorbs the impact when the stopper portion 32 comes into contact with the stopper portion 32 .

Further, on the tip end side of the lower part 13 of the upper case 1a, pressing portions 35... formed on the white keys 2...
Through-holes 36 are formed corresponding to the through-holes 36, and a groove 37 is formed further toward the distal end of the through-holes 36. The through holes 36... are connected to the black keys 3...
The through-holes 26 are formed in exactly the same manner as the through-holes 26 . That is, the elastic bulging members 38 are located inside the through holes 36.
is arranged to protrude upward, and the through hole 3
Relief portions 36a are formed at the upper hole edges of 6, respectively. Moreover, each pressing portion 35 of the white key 2...
The lower surface of is also formed into an inclined surface 39 similar to the pressing portion 25 of the black key 3. In addition, the groove 37
is formed by molding the lower part 13 into a concave shape,
A wall portion 40 is provided across the arrangement direction of the keys 2..., 3... and is formed at the tip of the white key 2...
...is arranged so that it can be moved up and down. In this case, a white key guide portion 41 is integrally formed on the inner wall surface of the rear side (right side in the figure) of the groove 37. Two of these guide parts 41 are inserted into each side of the hollow part 42 of the white key 2.
It guides the vertical movement of... and prevents the white keys 2... from swinging laterally. Note that the white key 2... also has a stopper section 43.
... is formed at the same location as that of black key 3.... This stopper portion 43... is connected to the stopper hole 30...
It is locked to a cushioning material 34 attached to the lower hole edge of the
This is to regulate the upper limit position of the white keys 2.

Further, a circuit board 44 is arranged on the lower surface of the lower part 13 of the upper case 1a, as shown in FIG. That is, one end of the circuit board 44 is locked to a locking part 45 provided on the rear outer wall of the groove 37 projecting downward of the lower step part 13, and the intermediate part of the circuit board 44 is It is attached with screws 47 via a member 46. On the circuit board 44, each through hole 26..., 36...
Elastic bulging members 27, 38, .
An insertion hole 48 into which is inserted is formed. Furthermore, electronic components (not shown) such as ICs and LSIs are attached to the lower surface of the rear side (right side in the figure) of the circuit board 44. The lower part 13 corresponds to the place where this electronic component is attached, that is, the lower part 1 located between the rising part 15 and the through hole 26...
3 stands up on the through-hole 26 side, and a gap 49 is formed between it and the circuit board 44. This gap 49 provides an escape for the legs of electronic components attached to the circuit board 44.
Furthermore, the rear side of the lower part 13 in this part is
It is bent diagonally upward and connected to the lower part of the rising portion 15 of the upper case 1a. this is,
This is to increase the strength of the rising portions 15 by shortening the vertical distance between the rising portions 15.

Furthermore, a support plate 5 for supporting each switch 5a of the switch section 5 is provided on the upper stage part 14 of the upper case 1a.
0 is attached with screws 51.

Next, the operation of the keyboard electronic musical instrument configured as described above will be explained. First, the case where the black key 3 of the keys 2, 3, . . . is pressed will be described.
In this case, the rear end 3a of the black key 3 is rotatably supported by the presser part 22 formed on the upper part 14 of the upper case 1a and the holding plate 23 attached to the lower part 13. , centering on this part, play black key 3
rotates downward. That is, the convex portion 19 formed on the lower surface of the rear end portion 3a is pushed upward by the retaining plate 23, and the groove 18 formed on the upper surface of the rear end portion 3a fits into the presser portion 22. In addition to being supported, the convex portion 19, the groove 18, and the presser portion 2
Since the lower ends of the holder 2 are each formed in a concentric arc shape, the rear end 3a and the black key 3 rotate smoothly around the lower end of the presser holder 22. When the black key 3 is rotated downward in this manner, the black key guide protrusion 29 formed to protrude above the lower part 13 of the upper case 1a is inserted into the hollow part 31 of the black key 3. Therefore, this black key guide protrusion 29
Since black key 3 is guided and rotated by
rotates downward without lateral vibration, and the inclined surface 28 of the pressing portion 25 presses down the elastic bulging member 27, causing the elastic bulging member 27 to be elastically deformed. In this case, since the inclined surface 28 is an inclined surface that rises toward the tip of the black key 3, it becomes a horizontal surface as it is gradually pushed down, making it possible to press down the elastic bulging member 27 well. can. Further, since the through hole 26 into which the elastic bulging member 27 is inserted has a relief portion 26a formed at the upper hole edge thereof, when the elastic bulging member 27 is pressed, its elastic deformation can be prevented by the relief portion 26a. The elastic bulging member 27 can be deformed well. When the elastic bulging member 27 is elastically deformed in this way, the movable contact 27a provided therein contacts the fixed contact 44a on the circuit board 44, and thereby the speaker section 8 generates musical sound. In addition, the lower limit position when the black key 3 is pressed is regulated by the movable contact 27a coming into contact with the fixed contact 44a.

After this, when the finger is released from the black key 3, the pressing portion 25 is pushed up by the restoring force (elastic force) of the elastic bulging member 27, and the black key 3 rotates upward to return to its original state. In this case, the stopper part 32 provided at the tip of the black key 3 rises with the black key 3, and is latched to the cushioning material 34 affixed near the bottom of the stopper hole 30, whereby the black key 3 The upper limit position of the black key 3 is regulated and the black key 3 is always set at a predetermined position.

Furthermore, when the white key 2 is pressed, the rear end 2a of the white key 2 and the white key 2 rotate downward around the lower end of the holding part 22, as in the case of the black key 3, and the upper case Concave groove 3 provided on the tip side of the lower part 13 of 1a
The front wall portion 40 of the white key 2 is inserted into the inside 7, and
The white key 2 is guided by the white key guide portions 41, 41 provided to protrude upward from the groove 37,
In addition, the pressing portion 35 of the white key 2 presses down the elastic bulging member 38, bringing the movable contact provided therein into contact with the rotating contact, thereby causing the speaker portion 8 to generate musical tones. Furthermore, when you release your finger from the white key 2, the elastic bulging member 38
Due to the restoring force, the pressing part 35 is pushed up, the white key 2 rotates upward and returns to its original state, and the stopper part 43 provided in the middle of the white key 2 is stopped by the cushioning material 34. As a result, the upper limit position of the white key 2 is regulated, and the white key 2 is set at a predetermined position.

Therefore, in the case of the above-mentioned keyboard electronic musical instrument, the upper case 1a has a lower section 13 in which the keys 2..., 3... are arranged, an upper section 14 in which the switch section 5 is disposed, and these sections. The structure is formed by integrally molding the rising part 15 to be connected, and the rising part 15 has a rear end part 2a of each key 2..., 3...,
3a... are formed into openings 16..., 17... into which the parts 3a... are inserted, and the upper part 14 is integrally formed with a presser part 22, and the lower part 13 is provided with elastic bulging members 27..., 38... Each through hole 26 to be inserted and arranged
..., 36..., guide portions 41 for guiding each key 2..., 3..., guide projections 29..., and stopper holes 30
... and the concave groove 37 are all integrally formed, the number of parts is extremely reduced, parts management can be simplified, and the number of assembly steps can be reduced, reducing assembly time. As a result, the cost of electronic keyboard musical instruments can be reduced.

In addition, for the above-mentioned keyboard electronic musical instruments, each key 2
..., 3..., each rear end 2a... of the white key 2... is formed to have the same width as the middle of the white key 2..., so that the white key 2... is cut at the opening 16... It is invisible and does not give a sense of discomfort in appearance. Furthermore, arc-shaped grooves 18..., 20... are formed on the upper surface of the rear end portions 2a..., 3a of each key 2..., 3..., and concentric grooves 18..., 20... are formed on the lower surface of the rear end portions 2a..., 3a... arc-shaped convex portions 19..., 21... are formed, and a presser portion 22 having a convex circular arc having the same curvature as the concave grooves 18..., 20... is fitted into the concave grooves 18..., 20.
..., 21... are pushed upward and supported by the holding plate 23, so when the key is pressed, the rear end 2
a..., 3a... rotate smoothly around the lower end of the holding portion 22, and therefore each key 2..., 3... can be rotated satisfactorily. In addition, when pressing a key as described above, the pressing portion 2 formed on each key 2..., 3...
Since the lower surfaces of 5..., 35... are formed as inclined surfaces 28..., 39..., the elastic bulging members 27..., 38...
... can be pressed well, and the upper hole edges of the through holes 26..., 36... have relief portions 26a...,
36a... are formed, the elastic deformation of the pressed elastic bulging members 27..., 38... can escape to the relief parts 26a..., 36a..., and therefore the elastic bulging members 27..., 38... can be elastically deformed well. Further, when the elastic bulging members 27..., 38... are pressed and the respective contacts are electrically connected, the respective pressing portions 25..., 35... will not be lowered any further, and as a result, each of the keys 2..., 3... The lower limit positions of the keys 2, 3, . . . are not required.

Furthermore, in the case of the above-mentioned keyboard electronic musical instrument, the rising portion 15 in the lower part 13 of the upper case 1a is
The space between the through-holes 26 and 26 stands up on the side of the through-holes 26 and is separated from the circuit board 44, so the legs of the electronic components attached to the circuit board 44 escape. circuit board 4
4 can be easily attached. Moreover, since the rising part 15 side of the lower step part 13 is inclined upward and connected to the rising part 15, the vertical interval of the rising part 15 becomes narrow, so that a large number of openings 16..., 17... are formed in this part. Even if it is formed, the strength of this part will not decrease.

In the above embodiment, the protrusions 19..., 21 formed on the rear end portions 2a..., 3a... of each key 2..., 3...
... are supported by the holding plate 23, but the present invention is not limited to this. For example, as shown in FIG. Good too. That is, the support plate 52 is a support member that supports the switch 5a of the switch section 5 disposed in the upper part 14 of the upper case 1a.
are extended toward the openings 16..., 17... of the rising portion 15, and the above-mentioned convex portion 19 is extended at this extended portion.
..., 21... is supported. Even with the support structure for the keyboard configured in this way, it has the same functions and effects as the above-mentioned embodiment, and since the holding plate 23 as in the above-mentioned embodiment is not required, the number of parts can be further reduced. This reduces the number of assembly steps and reduces assembly time.

As explained in detail above, according to the key support structure according to the present invention, the upper case is formed in a step-like manner, and each key is inserted into the opening in the rising part of the step-like part of the upper case. , and a presser foot whose upper part hangs down to the rear side of this opening is integrally formed with the upper case, so there is no need for a conventional keyboard chassis.
As the number of parts decreases, the number of assembly steps also decreases, making it possible to shorten assembly time and reduce manufacturing costs.
Further, an arcuate groove is formed on the upper surface of the end of each key to be inserted into the opening, and an arcuate convex portion concentric with the groove is formed on the lower surface of the end, and the presser part is inserted into the groove. In addition to being inserted and arranged, the convex portion is pushed up and supported by the holding member, so when a key is pressed, the end of each key rotates smoothly around the lower end of the presser, and as a result, each key is held smoothly. It can be rotated.

[Brief explanation of the drawing]

Fig. 1 is a plan view of the electronic keyboard musical instrument according to this invention, Fig. 2 is a bottom view of the sound emitting hole in the speaker section, Fig. 3 is a perspective view of the main parts of the electronic keyboard musical instrument, and Fig. 4 is a diagram of the electronic keyboard musical instrument. FIG. 5 is a longitudinal cross-sectional view of main parts showing another keyboard support structure. 1a... Upper case, 2... White key, 2a... Rear end, 3... Black key, 3a... Rear end, 13... Lower tier, 14... Upper tier, 15... Rising part,
16, 17...opening, 18,20...concave groove, 1
9, 21... Convex portion, 22... Holding portion, 23... Holding plate, 52... Supporting plate.

Claims (1)

[Scope of utility model registration request] An upper case constituting a case body of a keyboard instrument, and openings formed in rising portions of stepped portions formed in a part of the upper case corresponding to the arrangement intervals of a large number of keys. , on the upper surface of the end of each of the keys inserted into these openings,
an arcuate groove formed along the direction in which the keys are arranged, and a presser portion formed to protrude from the upper wall of the upper case so as to fit into the groove;
A convex part formed in an arc shape concentric with the concave groove on the lower surface of the end of each key facing the concave groove, and the presser part that comes into contact with the convex part work together to hold each key in the presser part. A support structure for a keyboard comprising a holding member rotatably held with the lower end of the keyboard as a rotation fulcrum.