JP3320953B2 - Keyboard device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a keyboard device provided in, for example, an electronic musical instrument.

[0002]

2. Description of the Related Art In recent years, electronic musical instruments have been actively used. Some of the electronic musical instruments have a keyboard device, and some of the electronic musical instruments have an independent keyboard device connected to the electronic musical instrument. One example of these is shown in FIG. The keyboard device 10 includes a chassis 20 and keys 30 such as a black key 32 and a white key 34. Since the black key 32 and the white key 34 are similar in structure, FIG. 15 shows the structure of the white key 34.
The white key 34 is a rotating part 36 at the left end in FIG.
It is attached so as to be rotatable in the direction approaching and separating from zero. Further, the white key 34 has an upper wall 34a and both side walls 34b which are open to the chassis 20 and have a U-shaped cross section as a whole. Further, the white key 34 is urged in the direction of arrow A by a coil spring 38 for returning the pressed white key 34 to its original position. The spring projection 21 enters one end of the coil spring 38, and the spring holding portion 31 enters the other end of the coil spring 38. The spring holding portion 31 includes an upper wall 34.
a and a space surrounded by both side walls 34b, and cannot be seen from above the white key 34.

[0003] Stop felts 22a and 22b for limiting the rotation range of the white key 34 are attached to the upper surface 20a and the lower surface 20b of the chassis 20, respectively.
The contact parts 40a, 40b are the stop felts 22a, 22
By contacting b, the rotation range of the white key 34 is limited. On the lower surface 20b side of the chassis 20, a contact board 50 for notifying key press information of the white key 34 to a control unit (not shown) of the electronic musical instrument is arranged. When the white key 34 is pressed, the key actuator 42 of the white key 34
2 is pressed, whereby the control unit of the electronic musical instrument is informed that the white key 34 has been pressed and the pressing speed.

As described above, the keyboard device 10 includes the chassis 20, the white key 34 attached to the chassis 20, and the coil spring 38 interposed between the chassis 20 and the white key 34. Since the function of returning the pressed white key 34 to the original position is required, the white key 34 needs to be fixed at a predetermined position between the chassis 20 and the white key 34.

[0005] As a keyboard device in which a coil spring is fixed at a predetermined position between a chassis and a white key, a cylindrical space is formed in the white key, and the coil spring is inserted into the space to insert the coil spring. A fixed keyboard device (for example, see Japanese Utility Model Application Laid-Open No. 54-33127) or a keyboard device in which a key and a chassis are formed with a projection for holding a spring as shown in FIG. ) Are known.

[0006] Among the above-mentioned conventional keyboard devices, in a keyboard device in which a spring and a projection for holding a spring are formed on a key and a chassis, the operation of attaching the white key 34 to the chassis 20 includes the following steps (1) to (3). It is performed in order. (1) As shown in FIG. 16, first, one end of the coil spring 38 is inserted into the spring projection 21. (2) Next, the white key 3 is set from above the chassis 20 so that the spring holding portion 31 (see FIG. 15) is inserted into the other end of the spring.
4 is placed on the chassis 20. (3) After placing the white key 34 on the chassis 20, the shaft of the chassis 20 is fitted into the hole of the white key 34 to form the rotating part 36.

[0007]

Problems to be Solved by the Invention (1) to (3)
The work (2) of the work (3) is performed by the white key 34 as described above.
Is inserted into the other end of the coil spring 38 because the spring holding portion 31 which is surrounded by the upper wall 34a and the side walls 34b and cannot be seen from above the white key 34 is inserted. There is a problem that this is a difficult and difficult task. Even in such a difficult operation, as shown in FIG. 16, one end of the coil spring 38 accurately enters the spring projection 21, and the coil spring 38
Is placed vertically, the white key 34 can be accurately attached to the chassis 20. However, the coil spring 38
When the coil spring 38 is inclined (diagonally) enters the spring projection 21 or the coil spring 38 is inclined due to vibration during work, the spring holding portion 31 is not accurately inserted into the other end of the coil spring 38. There is a possibility that the white key 34 may be attached to the chassis 20, causing a problem of defective products. Such a problem also exists in the above-described conventional keyboard device in which a cylindrical space is formed in a white key, and a coil spring is inserted into the space to fix the coil spring.

In view of the above circumstances, it is an object of the present invention to provide a keyboard device which can easily fix a coil spring at a predetermined position between a chassis and a key when attaching a key to the chassis.

[0009]

According to a first aspect of the present invention, there is provided a keyboard apparatus comprising: a chassis; and a chassis extending in a predetermined longitudinal direction and rotatable in a direction of coming into contact with and separating from the chassis. One end is supported, a key having a U-shaped cross-section upper wall and both side walls as a whole opened to the side of the chassis, interposed between the key and the chassis,
A keyboard device provided with a coil spring for urging the key away from the chassis; a first projection projecting from the chassis side toward the key and entering one end of the coil spring; And a spring tilt preventing projection formed at a position adjacent to the projection in the longitudinal direction and projecting toward the key along an outer wall of the coil spring into which the first projection enters. A second projection provided on the chassis side and projecting from the wall surface facing the chassis side of the upper wall of the key toward the chassis and entering the other end of the coil spring; and a second projection. Spring protruding toward the chassis along the outer wall of the coil spring into which the second protruding portion is formed, formed at a position adjacent to the portion in the longitudinal direction. And a wall is characterized in that provided in the key side.

Here, the spring fall prevention wall is formed by the second
It is preferable that the protrusions have a larger protrusion amount than the protrusion amount of the protrusion portion. Further, it is preferable that the spring fall prevention wall is a semi-cylindrical wall curved along the outer wall of the coil spring into which the second protrusion enters. Further, it is preferable that end portions on the chassis side of portions of the both side walls of the key that face the second protrusions are formed in a tapered shape that opens more toward the chassis.

In order to achieve the above object, a second keyboard device of the present invention has a chassis and one end supported by the chassis so as to extend in a predetermined longitudinal direction and to be rotatable in a direction of coming into contact with and separating from the chassis. A key having a generally U-shaped cross-section upper wall and both side walls opened to the side of the chassis, interposed between the key and the chassis, and biasing the key away from the chassis. A keyboard device having a coil spring that projects from the chassis side toward the key, and a projection that enters one end of the coil spring;
A spring holding portion formed along the outer wall of the coil spring into which the protrusion enters, the spring holding portion being formed at a position where the distance from the protrusion is smaller than the diameter of the element wire of the coil spring, is provided on the chassis side; , it is characterized in that it is made by press-fitting the wire of the coil spring between clearance between the spring retainer portion and the projection portion.

Further, the present invention for achieving the above object is provided.
The third keyboard device extends in a predetermined longitudinal direction with the chassis.
And the chassis is rotatable in a direction to contact and separate from the chassis.
One end is supported, open to the chassis side
A key having an upper wall and both side walls having a U-shaped cross section as a whole
And the key is interposed between the key and the chassis, and the key is
Keyboard device with a coil spring that biases it away from
Position, project from the chassis side toward the key.
And a projecting portion that enters one end of the coil spring.
The coil spring element wire into which the protrusion of
A spring holding portion for elastically pressing the portion.
It is assumed that. Here, the second keyboard device or upper
In the third keyboard device, it is preferable that the spring holding portion has a convex portion whose tip abuts on a wire of the coil spring into which the projecting portion enters .

[0013]

Embodiments of the present invention will be described below with reference to the drawings. 1A and 1B show a keyboard device according to a first embodiment of the present invention. FIG.
(B) is a partially enlarged view of (a), and shows a state immediately before a key is attached to the chassis. FIG. 2 is a perspective view showing a part of the key of the keyboard device shown in FIG. 1, viewed from the rear side, and FIG. 3 is a perspective view showing a part of the chassis of the keyboard device shown in FIG. Here, the same components as those of the keyboard device shown in FIG. 15 are denoted by the same reference numerals.

The keyboard device 60 includes a chassis 70, a key 90 extending in a predetermined longitudinal direction (the direction of arrow A), and a chassis 7.
A coil spring 110 is provided between the key 0 and the key 90. The key 90 has a generally U-shaped cross-section upper wall 92 and both side walls 94 opened to the chassis 70 side. One end 96 of the key 90 is supported by the chassis 70 so as to be rotatable in a direction in which the key 90 comes into contact with and separate from the chassis 70.
Further, the coil spring 110 is interposed between the key 90 and the chassis 70 and urges the key 90 in a direction away from the chassis 70.

A key 90 is attached to the chassis 70 from the chassis side.
A first protrusion 72 protruding toward is formed, and the first protrusion 72 enters one end 112 of the coil spring 110. Further, ribs 74 and 76 are formed on the chassis 70 at positions adjacent to the first protrusion 72 in the longitudinal direction (the direction of arrow A). Rib 74,
Reference numeral 76 protrudes toward the key 90 along the outer wall 110a of the coil spring 110 in a state where the first protrusion 72 is inserted. In the present embodiment, the rib 74 corresponds to the “ spring tilt prevention protrusion ” according to the present invention.

The key 90 is formed with a second projection 98 projecting from a wall surface 92a of the upper wall 92 facing the chassis 70 toward the chassis 70. The second projection 98 The coil spring 110 is inserted into the other end 114. The key 90 is located at a position adjacent to the second protrusion 98 in the longitudinal direction (the direction of arrow A),
A spring fall prevention wall 100 is formed at a position opposite to the longitudinal direction (direction of arrow A) of the coil spring 110 with respect to the coil spring 110. The spring fall prevention wall 100 is a semi-cylindrical wall as shown in FIG. 2, and curves along the outer wall 110 a of the coil spring 110 in which the second protrusion 98 is inserted and projects toward the chassis 70. ing. The amount of protrusion of the spring fall prevention wall 100 is larger than the amount of protrusion of the second protrusion 98. As shown in FIG.
At the end of the portion facing the second protrusion 98 on the side of the chassis 70, a taper 94a that opens more toward the chassis 70 is formed. Note that, as described above, FIG. 1 shows a state immediately before the key 90 is attached to the chassis 70, and the key 90 is attached to the shaft 78 of the chassis 70.
Of the key 9 into the chassis 70
0 is attached.

As described above, the chassis 70 of the keyboard device 60
Is formed with a rib 74, while the key 90 is formed with a spring fall prevention wall 100 and a taper 94a. The operation of each of these members will be described with reference to FIG. FIG. 4A shows a key 90 ′ without the spring fall prevention wall 100, in order to show the action of the spring fall prevention wall 100.
FIG. 4B is a schematic view showing a state in which the chassis 7 is mounted on the chassis 7 without the rib 74.
It is a schematic diagram which shows how a key 90 is attached to 0 '.

Even if the one end 112 of the coil spring 110 is accurately inserted into the first projection 72 of the chassis 70 and the coil spring 110 is placed vertically on the chassis 70,
As shown in FIG. 4 (a), the key 90 'is attached to the spring
0 If 0 is not the position of the second protrusion 98 of the key 90 'is offset to the rib 74 side with respect to the position of the first projection 72, the other end 114 of the coil spring 110 2 The key 90 'is attached to the chassis 70 in a state where the projection 98 does not enter, thereby causing defective products. On the other hand, the coil spring 1 is attached to the first projection 72 of the chassis 70 '.
10. One end 112 of the chassis 10 is exactly inserted into the chassis 70 ′.
Even if the coil spring 110 is placed vertically on the
(B), the case where there is no rib 74 on the chassis 70 ', the second position of the protrusion 98 is spring-falling prevention walls 1 0 0 side with respect to the position of the first protrusion 72 of the key 90 Otherwise, the key 90 is attached to the chassis 70 'in a state where the second protrusion 98 does not enter the other end 114 of the coil spring 110, which causes defective products. Thus, if one of the ribs 74 and the spring falling prevention walls 1 0 0 no, when the attachment of the key 90 to the chassis 70, precisely aligned with the first protrusion 72 and the second protrusion 98 Must be done, which is a difficult installation task. Further, when the one end 112 of the coil spring 110 is not accurately inserted into the first protrusion 72 of the chassis 70 and the coil spring 110 is inclined, the coil spring 110
The second protrusion 98 is inserted into the other end 114 of the
It is extremely difficult to accurately attach the 0 to the chassis 70. However, the chassis 70 of the keyboard apparatus 60 and the rib 74 is formed, since the prevention wall 1 0 0 collapse spring in the key 90 is formed, prevention wall 1 0 collapse of the coil spring 110 is rib 74 and the spring collapse Is prevented by 0 and
The key 90 can be accurately and easily attached to the chassis 70 by inserting the second projection 98 into the other end 114 of the coil spring 110. Further, the taper 94a is
The coil spring 110 is prevented from falling down in a direction substantially perpendicular to the width direction (direction of the arrow A), so that the work of attaching the key 90 is further facilitated.

FIGS. 5 and 6 are plan views showing ribs of the keyboard device according to the second embodiment of the present invention. The keyboard device according to the second embodiment is characterized by ribs formed on the chassis 70. This rib corresponds to the spring holding portion according to the present invention.
You. The rib 120 of this keyboard device is configured such that the distance (interval) between the rib 120 and the projection 72 is the length of the wire 110 of the coil spring 110.
It is formed at a position shorter than the diameter of a. Further, a portion of the rib 120 on the side of the protrusion 72 is a protrusion 120a, and the tip of the protrusion 120a contacts the element wire 110a. For this reason, the wire 110a of the coil spring 110 is press-fitted between the rib 120 and the protrusion 72, and the coil spring 1
10 is fixed. Therefore, even if an error occurs in the inner diameter of the coil spring 110 due to an error in manufacturing the coil spring 110 and the inner diameter is larger than the outer diameter of the protrusion 72, the coil spring 110 can be fixed almost vertically to the chassis 70, The coil spring can be easily fixed at a predetermined position between the chassis and the key.

FIG. 7 is a side view showing a rib of a keyboard device according to a third embodiment of the present invention. In the keyboard device of the third embodiment, the spring according to the present invention formed on the chassis 70
There is a feature in the rib corresponding to the holding portion . The rib 130 of this keyboard device has an inverted U-shape, and has a spring property. One end 132 of the rib 130 is attached to the chassis 7.
It is fixed to 0. The other end 134 of the rib 130
Is formed with a projection 134a protruding toward the projection 72, and the distance between the tip of the projection 134a and the projection 72 is shorter than the diameter of the strand 110a of the coil spring 110. Therefore, the protrusion 134a of the rib 130 and the protrusion 72
The wire 110a of the coil spring 110 is press-fitted between the wire and the wire 110a, and the wire 110a is urged by the protrusion 72, so that the coil spring 110 is more securely fixed. Therefore, even if an error occurs in the inner diameter of the coil spring 110 due to an error in manufacturing the coil spring 110 and the inner diameter is larger than the outer diameter of the protrusion 72, the coil spring 110 can be fixed almost vertically to the chassis 70, The coil spring can be easily fixed at a predetermined position between the chassis and the key. Further, as described above, since the rib 130 has a spring property, noise due to resonance of the coil spring 110 can be prevented.

FIGS. 8 to 14 show modifications of the rib 130 shown in FIG. FIG. 8 shows the first rib shown in FIG.
It is a side view which shows a modification. As shown in FIG. 8, a pair of ribs 130 are arranged with the protrusion 72 interposed therebetween. Therefore, compared to the case of one rib 130, the coil spring 11
0 is more reliably fixed.

FIG. 9 is a side view showing a second modification of the rib shown in FIG. 7, and FIG. 10 is a plan view of the rib shown in FIG. The shape of the rib 140 is the same as the shape of the rib 130 in FIG.
40 is in contact with the surface on the side where it is arranged. 7, one end 142 of the rib 140 is fixed to the chassis 70. The other end 144 of the rib 140 has a protrusion 1 protruding toward the protrusion 72.
44a is formed, and the distance between the tip of the protrusion 144a and the protrusion 72 is shorter than the diameter of the wire 110a of the coil spring 110. Therefore, similarly to the rib 130 of FIG. 7, the coil spring 110 can be fixed substantially vertically to the chassis 70, and the coil spring can be easily fixed at a predetermined position between the chassis and the key.

FIG. 11 is a plan view showing a third modification of the rib shown in FIG. As shown in FIG. 11, a pair of ribs 140 are arranged with the protrusion 72 interposed therebetween. For this reason,
The coil spring 110 is more securely fixed than one rib 140. FIG. 12 is a plan view showing a fourth modification of the rib shown in FIG.

As shown in FIG. 12, a pair of ribs 140 are arranged with the protrusion 72 interposed therebetween. However, as compared with the arrangement of FIG. 11, the directions of the U-shaped ribs 140 are opposite to each other. I have. Even if the pair of ribs 140 are arranged in this manner, the coil spring 110 is securely fixed, and the coil spring 1
10 can be prevented from falling down. FIG. 13 is a plan view showing a fifth modification of the rib shown in FIG.

The rib 150 has an elliptical shape, and the rib 150 is fixed to the chassis 70 (see FIG. 9) by a fixing portion 152. A protrusion 154 protruding toward the protrusion 72 is formed at a portion opposite to the fixing portion 152.
The distance between the tip of the projection 54 and the projection 72 is determined by the coil spring 110
Is shorter than the diameter of the element wire 110a. Therefore, similarly to the rib 130 of FIG. 7, the coil spring 110 can be fixed substantially vertically to the chassis 70, and the coil spring can be easily fixed at a predetermined position between the chassis and the key.

FIG. 14 is a plan view showing a sixth modification of the rib shown in FIG. The rib 160 is elliptical, and the rib 1
60 is a pair of fixing parts 162 and a chassis 70 (see FIG. 9).
It is fixed to. In addition, the rib 2
A pair of protrusions 164 protruding toward each of the two protrusions 72 is formed, and the tip of the protrusion 164 and the protrusion 7 are formed.
2 is shorter than the diameter of the wire 110 a of the coil spring 110. Therefore, one rib 160 can prevent the two coil springs 110 from falling down.
10 can be fixed substantially perpendicular to the chassis 70, and the coil spring can be easily fixed at a predetermined position between the chassis and the key.

[0027]

As described above, the ribs are formed on the chassis of the first keyboard device of the present invention, and the key is provided with the spring falling prevention wall. The key can be accurately and easily attached to the chassis by being prevented by the spring fall prevention wall and allowing the second protrusion to enter the other end of the coil spring.

Further, according to the second or third keyboard device of the present invention, the chassis includes the projection and the spring holding portion ,
A coil spring in which a wire is press-fitted between a spring holding portion and a projection (second keyboard device), or a coil spring
The elastic wire is elastically pressed against the projection by the spring holding part.
(Third keyboard device) , the coil spring can be fixed substantially vertically to the chassis, and the coil spring can be easily fixed at a predetermined position between the chassis and the key.

[Brief description of the drawings]

FIG. 1 shows a keyboard device according to a first embodiment of the present invention.
(A) is a sectional view in which a part of the key is cut away, and (b) is a partially enlarged view of (a), showing a state immediately before the key is attached to the chassis.

FIG. 2 is a perspective view showing a part of a key of the keyboard device shown in FIG. 1;

FIG. 3 is a perspective view showing a part of a chassis of the keyboard device shown in FIG. 1;

FIG. 4A is a schematic view showing a state in which a key without a spring fall prevention wall is attached to a chassis in order to show the action of a spring fall prevention wall, and FIG. 4B is a schematic view showing the action of a rib;
It is a schematic diagram which shows a mode that a key is attached to a chassis without a rib.

FIG. 5 is a side view showing a keyboard device according to a second embodiment of the present invention.

FIG. 6 is a plan view showing the rib of FIG. 5;

FIG. 7 is a side view showing a rib of a keyboard device according to a third embodiment of the present invention.

FIG. 8 is a side view showing a first modified example of the rib shown in FIG. 7;

FIG. 9 is a side view showing a second modified example of the rib shown in FIG. 7;

FIG. 10 is a plan view showing the rib of FIG. 9;

FIG. 11 is a plan view showing a third modification of the rib shown in FIG. 7;

FIG. 12 is a plan view showing a fourth modification of the rib shown in FIG. 7;

FIG. 13 is a plan view showing a fifth modification of the rib shown in FIG. 7;

FIG. 14 is a plan view showing a sixth modification of the rib shown in FIG. 7;

FIG. 15 is a cutaway view showing an example of a conventional keyboard device.

16 is an enlarged view showing a chassis and a coil spring of the keyboard device shown in FIG. 15 in an enlarged manner.

[Explanation of symbols]

60 keyboard apparatus 70 chassis 72 first protrusion 74,120,130,140,150,160 rib 90 key 92 upper wall 92a wall 94 both side walls 94a taper 96 at one end portion 98 the second protrusion 1 0 0 spring falling prevention Wall 110 coil spring 110a outer wall 114 other end

Continuation of the front page (56) References JP-A-7-84570 (JP, A) JP-A-2-287497 (JP, A) JP-A 57-11584 (JP, U) JP 4-34556 (JP) , Y2) (58) Field surveyed (Int. Cl. ⁷ , DB name) G10B 3/12 G10C 3/12 G10H 1/34

Claims (6)

(57) [Claims] 1. A U-shape generally open to the side of the chassis, the chassis having one end supported by the chassis so as to extend in a predetermined longitudinal direction and to be rotatable toward and away from the chassis. A keyboard device comprising: a key having an upper wall and both side walls in cross section; and a coil spring interposed between the key and the chassis and biasing the key in a direction away from the chassis. A first protrusion protruding toward a key and entering one end of the coil spring; and a first protrusion formed at a position adjacent to the first protrusion in the longitudinal direction. For preventing the spring from projecting toward the key along the outer wall of the coil spring.
A second protrusion that protrudes toward the chassis from a wall surface facing the chassis of the key, and a second protrusion that enters the other end of the coil spring; A spring fall prevention wall formed at a position adjacent to the second protrusion in the longitudinal direction and protruding toward the chassis along an outer wall of the coil spring into which the second protrusion enters. A keyboard device provided on the key side. 2. The spring fall prevention wall is curved along an outer wall of the coil spring into which the second protrusion enters.
2. The keyboard device according to claim 1, wherein the keyboard device is a semi-cylindrical wall . 3. A chassis-side end of a portion of each of the side walls of the key that faces the second protrusion is provided with the chassis.
Into a tapered shape that opens more toward each other
It is in a Rukoto keyboard apparatus according to claim 1 or 2 wherein. 4. A chassis, said chassis extending in a predetermined longitudinal direction.
One end of the chassis so that it can rotate freely in the direction to contact and separate from the chassis
The part is supported, the whole open to the side of the chassis and
A key having an upper wall and both side walls having a U-shaped cross section,
Intervening between the key and the chassis, and removing the key from the chassis
Keyboard device equipped with a coil spring that urges in the release direction.
And projecting from the chassis side toward the key,
Between the projection that enters one end of the il spring and the projection
Septum forming a narrow position than the diameter of the wire of the coil spring
Outside of the coil spring into which the projection is inserted
A spring holding portion along a wall is provided on the chassis side, and the coil spring is provided with a gap between the spring holding portion and the protrusion.
The key board arrangement you characterized der Rukoto made by press-fitting the wire of the coil spring between. 5. A chassis, wherein said chassis extends in a predetermined longitudinal direction.
One end of the chassis so that it can rotate freely in the direction to contact and separate from the chassis
The part is supported, the whole open to the side of the chassis and
A key having an upper wall and both side walls having a U-shaped cross section,
Intervening between the key and the chassis, and removing the key from the chassis
Keyboard device equipped with a coil spring that urges in the release direction.
The key protruding from the chassis side toward the key.
A projection that enters one end of the il spring,  SaidThe protrusions are penetratedCoil spring wirePrevious
A spring presser for elastically pressing the protrusion.thing
A keyboard device characterized by the following. 6. The keyboard device according to claim 4 , wherein the spring holding portion has a convex portion whose tip abuts on a wire of the coil spring into which the projecting portion enters.