JPH0716994U - Electronic musical instrument keyboard device - Google Patents

Abstract

(57) [Summary] [Object] To provide a keyboard device for an electronic musical instrument, which can give a click feeling to a key only by changing the shape of a member conventionally provided. [Structure] A key guide that guides a key is elastic with a guide portion that is in sliding contact with the inner wall of the key, and an engaging protrusion that extends downward from the guide portion and that engages with the key temporarily at the lower end during key depression. Equipped with an arm. Alternatively, the key guide includes the guide portion and an elastically deformable portion that is provided in an arcuate shape on the upper surface of the guide portion and that deforms so that the drag force against the key depression is maximized during the key depression. It was

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a keyboard device for an electronic musical instrument, in which a feeling of key depression similar to that of an acoustic keyboard musical instrument can be obtained.

[0002]

[Prior art]

 In recent years, electronic musical instruments have been widely used, and many of them are accustomed to playing acoustic keyboard musical instruments, and are used to bring out the expressive power of the performers. It is preferable that the key feeling of an acoustic keyboard instrument is the same as that of an electronic musical instrument. An acoustic keyboard instrument key responds to this key depression within the prescribed range of its key depression, and beyond this prescribed range, there is almost no response to that key depression. A click feeling is obtained at the position where the response is changed. However, the keyboard device for acoustic keyboard instruments is large, and is not suitable for electronic musical instruments that require miniaturization. Therefore, various techniques have been proposed for making the key-press feeling close to that of an acoustic keyboard instrument without increasing the size of the electronic musical instrument (see, for example, Japanese Utility Model Publication No. 54-41708).

FIG. 11 is a diagram showing a keyboard device proposed in the above publication. The key 50 is rotatably supported by a fulcrum 53. A leaf spring 50c is provided at the rear end 50b of the key 50, and the leaf spring 50c is attracted to the magnet 51. The magnet 51 is provided at the tip of a pivoting piece 52 that is axially supported, and a stopper 54 is provided above the pivoting piece 52. Further, a groove 50d is formed in the key 50, and a key guide 55 which is in sliding contact with the inner wall of the key 50 when the key 50 is operated is provided at a position facing the opening of the groove 50d.

When the front end 50a of the key 50 is pressed, the rear end 50b is pushed up while the leaf spring 50c is attracted to the magnet 51. At this time, the rotating piece 52 having the magnet 51 rotates upward until it comes into contact with the stopper 54. When the rotating piece 52 comes into contact with the stopper 54 and the rear end 50b is further pushed up, the leaf spring 50c attracted to the magnet 51 is bent, and therefore, the key 50 can be pressed. When the rear end 50b is further pushed up, the leaf spring 50c and the magnet 51 are separated. After these keys are released, the key press of the key 50 has almost no response, and therefore the key press of the key 50 has a click feeling due to the switching. Further, the key guide 55 is in sliding contact with the inner wall of the groove 50d when the key 50 is pressed, and this key guide 55 prevents the key 50 from rolling when the key 50 is pressed obliquely. .

[0005]

[Problems to be solved by the device]

 The keyboard device shown in FIG. 11 needs to be provided with a mechanism including a plate panel 50c, a magnet 51, a rotating piece 52, and a stopper 54 in order to give a click feeling to the key 50, and the device becomes large. There is also the problem of increased costs. The present invention has been made in view of the above circumstances, and an object thereof is to provide a keyboard device for an electronic musical instrument, which can give a click feeling to a key only by changing the shape of a member conventionally provided.

[0006]

[Means for Solving the Problems]

 A first keyboard device of an electronic musical instrument of the present invention for achieving the above object is a key rotatably supported by the frame in a direction of contacting and separating from the frame and a key that is erected on the frame and is operated during key operation. In a keyboard device for an electronic musical instrument, comprising a key guide for guiding the key by sliding contact with the inner wall of the key, the key guide includes a guide portion for slidingly contacting the inner wall of the key and guiding the above key, and this guide. The elastic arm has a lower end having an engaging protrusion that extends downward from the portion and temporarily engages with the key during key depression.

A second keyboard device for an electronic musical instrument of the present invention for achieving the above object is a key rotatably supported by the frame in a direction in which the frame comes into contact with and separates from the frame. In a keyboard device of an electronic musical instrument, which is provided upright and has a key guide for guiding the key by slidingly contacting the inner wall of the key when the key is operated, the key guide is slidably contacting the inner wall of the key to lock the key. A guide portion for guiding and an elastically deformable portion provided in an arch shape on the upper surface of the guide portion and deformed by a key depression so that the resistance against the key depression is maximized in the middle of the key depression. It is characterized by that.

[0008]

[Action]

 In the first keyboard device of the present invention, the guide portion of the key guide slides on the inner wall of the key, and the engaging projection of the elastic arm of the key guide temporarily engages with the key during the key depression. Therefore, a click feeling is obtained by the engagement. As described above, the click feeling can be obtained by using the key guide that has been conventionally provided in the keyboard device.

In addition, in the second keyboard device of the present invention, the above-mentioned guide portion slides in contact with the inner wall of the key, and at the same time, the elasticity that deforms so that the drag force against the key depression is maximized in the middle of the key depression. Since the deformed portion is provided on the upper surface of the guide portion, a click feeling can be obtained at the key pressing position where the drag force is maximized.

[0010]

【Example】

 Embodiments of the present invention will be described below. FIG. 1 is a partial cross-sectional side view of an embodiment of a keyboard device for an electronic musical instrument of the present invention. The white key 2 is rotatably supported by the frame 1 in the direction of coming in and out of contact with the frame 1, and the hook portion 2a of the white key 2 is used to position the white key 2 when the key is released. It is in contact with felt 1a. The second felt 1b is fixed to the surface of the frame 1 opposite to the first felt 1a. The second felt 1b contacts the contact surface 2b of the white key 2 and regulates the lower limit of the white key 2. A key guide 4 erected on the frame 1 is inserted in a hollow portion 2d inside the key, which is a cross section of the white key 2, and the hammer 3 is in contact with the first cushioning material 1c. When the white key 2 is pressed, the hammer 3 is pushed upward and comes into contact with the second shock absorbing material 1d to regulate the upper limit of the hammer 3. When the white key 2 is released, the hammer 3 descends, whereby the white key 2 returns upward. First and second holding portions 6 and 7 are fixed to the frame 1. A recess is formed in the first holding portion 6 on the right side in FIG. 1, and a snap 7a is formed in the second holding portion 7. A rubber plate 10 is fixed on the upper surface of the switch board 8, and the left end of the switch board 8 is inserted into the recess of the first holding portion 6. A hole (see FIG. 10) is provided on the right side of the rubber plate 10 and the switch substrate 8, and the switch substrate 8 is attached to the snap 7a by inserting the snap 7a of the second holding portion 7 into the hole. It is installed. The switch substrate 8 is held by the first and second holding portions 6 and 7 in this manner, and the rubber switch 9 is provided on the upper surface of the rubber plate 10. A key actuator 2c for pressing the rubber switch 9 is provided at a position of the white key 2 facing the rubber switch 9. Further, this keyboard device is provided with a black key 11, and the hook member 11a thereof contacts the third felt 1e so that the black key 11 is positioned when the key is released. When the black key 11 is pressed, its contact surface 11b comes into contact with the fourth felt 1f and the lower limit of the black key 11 is regulated.

FIG. 2 is a view showing a cross section taken along the line AA of FIG. 1 in the initial state of the key depression of the key inner side hollow portion 2d of the white key shown in FIG. The inner hollow portion 2d of the white key 2 is narrower at the inner side of the hollow portion (the upper portion in FIG. 2) than the opening portion, and the engaging surface 2e is formed at the narrowed position. The key guide 4 is provided with a guide portion 4a which is in sliding contact with the inner wall of the key inner side hollow portion 2d, and an elastic arm 4b extends downward from the guide portion 4a. An engaging protrusion 4c is formed on the lower end of the elastic arm 4b.

As shown in FIG. 2, the inner wall of the key inner cavity 2d is in sliding contact with the guide portion 4a of the key guide 4, and the white key 2 is pressed while being guided by the guide portion 4a. FIG. 3 is a view similar to FIG. 2, showing a state in the middle of key depression. When the white key 2 is pressed, the white key 2 moves down while the inner wall of the white key 2 slides on the guide portion 4a, and in the middle of the lowering of the white key 2, as shown in FIG. The engagement surface 2e temporarily engages with the engagement protrusion 4c. Therefore, the key pressing load of the white key 2 temporarily increases at the key pressing position.

FIG. 4 is a view similar to FIGS. 2 and 3, showing the state of the white key in the latter half of key depression. The white key 2 is further depressed so that the engagement surface 2e thereof is pushed down below the engagement protrusion 4c, whereby the engagement thereof is released. Therefore, the key-pressing load of the white key 2 in the state shown in FIG. 4 decreases sharply as compared with the key-pressing load of the white key 2 in the state shown in FIG. A click feeling is obtained by pressing the key.

Here, the guide portion 4a of the key guide 4 is in contact with the inner wall of the key inner cavity portion 2d from the initial state of pressing the white key 2 to the later state (see FIGS. 2 to 4). Therefore, even if the white key 2 is depressed from an oblique direction, its rolling is prevented. FIG. 5 is a diagram showing the relationship between the stroke of the white key and the key load when the white key is pressed.

The first curve 11 shows the key-depression load when the white key 2 is depressed, and the second curve 12 shows the key-release load when the white key 2 is released. The first curve 11 showing the key pressing load of the white key 2 has a convex portion 11a. The convex portion 11a exhibits a sharp increase and a rapid decrease in the key pressing load when the engaging surface 2e is temporarily engaged with the engaging protrusion 4c. On the other hand, the second curve 12 showing the key release load does not have a convex portion like the first curve 11, so that it can be seen that the white key 2 returns smoothly. When the stroke of the white key 2 is maximized, the contact surface 2b comes into contact with the second felt 1b (see FIG. 1) and the lower limit is regulated, as described above.

FIG. 6 is a sectional view showing a portion of a key inner cavity portion of another embodiment of the keyboard instrument of the electronic musical instrument of the present invention. The same components as those of the above-described keyboard musical instrument (see FIGS. 1, 2, 3, and 4) are designated by the same reference numerals, and the duplicate description will be omitted. The white key 2 shown in FIG. 6 is released, and the key guide 4 is inserted into the key inner cavity 2d of the white key 2. The key guide 4 is composed of a guide portion 4a and an elastically deforming portion 4d provided on the upper surface of the guide portion 4a. The guide portion 4a is in contact with the inner wall of the white key 2.

FIG. 7 is a diagram showing a state where the key guide shown in FIG. 6 is pressed halfway. When the white key 2 is pressed, the hollow portion 2d inside the key slides down along with the guide portion 4a, and the upper inner wall of the white key 2 presses the elastically deformable portion 4d. The elastically deformable portion 4d is deformed against the pressing of the white key 2, and thereby the key pressing load of the white key 2 is rapidly increased. FIG. 8 is a diagram showing a state in which the white key is pressed to the end.

When the white key 2 is pressed to the end, the elastically deformable portion 4 d is crushed by the pressing of the white key 2. The elastically deformable portion 4d deforms with almost no resistance to the pressing of the white key 2 from the state shown in FIG. 7 to the state shown in FIG. The resistance against the key becomes maximum during the key depression (state shown in FIG. 7). For this reason, a click feeling is obtained for the key depression.

Here, the lower limit of the white key 2 is regulated by the second felt 1b (see FIG. 1), but the key guide 4 shown in FIGS. Since it is pressed by the elastic deformation portion 4d, the lower limit of the white key 2 can be regulated while also having the function of the second felt 1b. Here, the holding mechanism (see FIG. 1) of the rubber switch 9 provided in the keyboard device of the present embodiment will be described. Hereinafter, the conventional rubber switch holding mechanism will be described first, and then the rubber switch holding mechanism in the present embodiment will be described.

FIG. 9A is a diagram showing an example of a conventional rubber switch holding mechanism, and FIG. 9B is a diagram showing another example of a conventional rubber switch holding mechanism. The key 60 shown in FIG. 9A is formed with a key actuator 60a, and the frame 61 is provided with two holding portions 62 and 63. The left end of the switch board 64 in FIG. 9 is inserted into the recess of the holding portion 62, and the snap 63a of the holding portion 63 is inserted into the hole on the right side of the switch board 64. In this way, the switch board 64 is supported by the holders 62 and 63. The leg 65a of the rubber switch 65 is inserted into the hole of the switch board 64, whereby the rubber switch 65 is fixed to the position of the switch board 64 facing the key actuator 60a.

Further, in the example shown in FIG. 9B, the switch substrate 69 to which the rubber switch 70 is fixed is fixed to the frame 67 with two screws 68. The rubber switches 65 and 70 are pressed by the key actuators 60a and 66a when the keys 60 and 66 are pressed by a predetermined amount or more. When the rubber switches 65 and 70 are pressed, the CPU (not shown) of the electronic musical instrument detects that the keys 60 and 66 are pressed. The CPU emits a musical sound based on the detected key pressing speed of the keys 60 and 66.

The switch board 64 shown in FIG. 9A is held by the holding portions 62 and 63 as described above. The dimensional accuracy of the recesses of the holding portion 62 and the snap 63a of the holding portion 63 may vary during manufacturing, and some amount of backlash is inevitably required for mounting the switch board 64. Therefore, the switch board 64 attached to these may rattle with respect to the holding portions 62 and 63, which may cause noise noise during performance. Further, in the switch board 69 shown in FIG. 9B, the screw 68 may be loosened, and in this case as well, noise sound may be generated.

FIG. 10A is a diagram showing a state during the assembly of the switch board shown in FIG. A rubber plate 10 is fixed to the upper surface of the switch substrate 8. A first thick portion 10a is formed near the left end of the rubber plate 10 in FIG. 10 (a), and the rubber plate 10 has a periphery of a hole into which the snap 7a of the second holding portion 7 is inserted. The second thick portion 10b is formed in the. A protrusion 6 a is formed on the upper portion of the concave portion of the first holding portion 6.

FIG. 10B is a diagram showing a state in which the switch substrate is assembled. The right portion of the switch substrate 8 in the state shown in FIG. 10A is pushed up and the switch substrate 8 is held by the first and second holding portions as shown in FIG. 10B. In the assembled state, the switch substrate 8 has its left end fitted in the recess of the first holding portion 6, and the first thick portion 10a of the rubber plate 10 fits in the projection 6a of the first holding portion 6. Pressed. Further, the lower surface around the hole of the switch board 8 is locked to the snap 7a of the second holding portion 7, and the second thick portion 10b of the rubber plate 10 is pressed by the second holding portion 7. There is.

Since the switch substrate 8 is held by the first and second holding portions 6 and 7 via the elastic rubber plate 10, even if there is an error in the dimensional accuracy of these holding portions 6 and 7. The rattling of the switch substrate 8 is prevented. Therefore, generation of noise noise is prevented. FIG. 10C is a diagram showing a state in which the snap of the second holding portion is removed from the switch substrate.

The switch substrate 8 may be removed from the snap 7a of the second holding portion 7 when the rubber switch 9 fails. The switch boards 64 and 8 are spread in a direction perpendicular to the paper surface of FIGS. 9A and 10, and a holding portion 63 and a second holding portion are provided to fix the switch boards 64 and 8 thus spread. A plurality of 7 are also formed in the direction perpendicular to the paper surface. In that case, in the case of the conventional mechanism shown in FIG. 9A, even if the snap 63a of one holding portion 63 for removing the switch board 64 is removed, the switch board 64 is still hard, While the snap 63a of the holding portion 63 is being removed, the snap 63a that has already been removed may be re-engaged with the switch board 64. On the other hand, the switch substrate 8 of this embodiment has the second thick portion 8b of the rubber plate 8 between it and the second holding portion 7, as shown in FIG. Therefore, if the switch board 8 is removed from the snap 7a of the second holding portion 7, the rubber plate 8 acts as a spring, and the snap 7a once removed is prevented from being re-engaged with the switch board 8. To be done.

[0027]

[Effect of device]

 As described above, in the first keyboard device of the electronic musical instrument of the present invention, since the engaging protrusion of the elastic arm of the key guide temporarily engages with the key during the key depression, Gives a click feeling. Further, in the second keyboard device of the electronic musical instrument of the present invention, the elastic deformation portion of the key guide is deformed so that the reaction force against the key depression becomes maximum in the middle of the key depression. A click feeling is obtained at the maximum key pressing position. As described above, in the present invention, it is not necessary to separately provide a mechanism for imparting a click feeling and a mechanism for preventing roll of the key.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional side view of an embodiment of a keyboard device for an electronic musical instrument of the present invention.

FIG. 2 is a view showing a cross section taken along the line AA of FIG. 1 in a key pressing initial state of a key inner side hollow portion 2d of the white key shown in FIG.

FIG. 3 is a view similar to FIG. 2, showing a state in the middle of key depression.

FIG. 4 is a view similar to FIGS. 2 and 3, showing a state of a white key in the latter half of key depression.

FIG. 5 is a diagram showing the relationship between the stroke of the white key and the key load when the white key is pressed.

FIG. 6 shows another embodiment of the keyboard instrument of the electronic musical instrument of the present invention,
It is sectional drawing which shows the part of a key inner side cavity part.

FIG. 7 is a diagram showing a state where the key guide shown in FIG. 6 is pressed halfway.

FIG. 8 is a diagram showing a state in which a white key is pressed to the end.

FIG. 9A is a diagram showing an example of a conventional rubber switch holding mechanism, and FIG. 9B is a diagram showing another example of a conventional rubber switch holding mechanism.

FIG. 10A is a diagram showing a state where the switch substrate is being assembled, FIG. 10B is a diagram showing a state where the switch substrate is assembled, and FIG. 10B is a diagram showing a state where the snap of the second holding portion is removed from the switch substrate. c).

FIG. 11 is a diagram showing a keyboard device proposed in Japanese Utility Model Publication No. 54-41708.

[Explanation of symbols]

 1 Frame 2 White Key 2d Key Inner Cavity 3 Hammer 4 Key Guide 4a Guide 4b Elastic Arm 4c Engagement Protrusion 4d Elastic Deformation

Claims (2)

[Scope of utility model registration request] 1. A key rotatably supported by the frame in a direction of coming into contact with and separating from the frame, and a key guide which stands on the frame and guides the key by sliding contact with the inner wall when the key is operated. In a keyboard device of an electronic musical instrument comprising: a key portion, the key guide is slidably in contact with an inner wall of the key to guide the key, and extends downward from the guide portion. Keyboard device for an electronic musical instrument, comprising: an elastic arm having a lower end portion with an engaging projection that is mechanically engaged. 2. A key rotatably supported by the frame in a direction of coming into contact with and separating from the frame, and a key which is erected on the frame and guides the key by slidingly contacting an inner wall of the key when the key is operated. In a keyboard device of an electronic musical instrument including a guide, the key guide, a guide portion that slides in contact with the inner wall of the key to guide the key, and is provided in an arch shape on the upper surface of the guide portion, by pressing the key, A keyboard device for an electronic musical instrument, comprising: an elastic deformation portion that deforms so that a resistance against the key depression is maximized in the middle of the key depression.