JP2007225958A - Keyboard device for electronic musical instrument - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a keyboard device for an electronic musical instrument that facilitates an after-touch playing style in which a rear part of a key is pressed. <P>SOLUTION: When a player presses a key 2 stronger after an unillustrated key switch is turned on as a front part of the key 2 is pressed, a stopper piece 2c presses a front after sensor 5 through a stopper 4 and the front after sensor 5 outputs pressing force information. When the player shifts the pressing position backward while pressing the key 2, a hinge fulcrum 2b bends. Consequently, the key 2 rotates while the stopper piece 1c presses the front after sensor 5, and then a rear projection part 2c also presses a rear after sensor 3, so that the rear after sensor 3 outputs pressing force information. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a keyboard device for an electronic musical instrument that realizes an aftertouch performance method.

In an electronic keyboard instrument, after a player presses a key to start sounding, it can change characteristics such as the volume and sound quality of the musical sound (musical sound being sounded) after it has stood up by further pressing the key. There is something. Such a playing technique is generally called an aftertouch playing technique.
FIG. 8 is a schematic configuration diagram of a conventional electronic musical instrument keyboard capable of aftertouch performance. FIG. 8A is a plan view. FIG. 8B is a partial cross-sectional view of the right side surface and shows a state before the key pressing is started.
In the figure, reference numeral 81 denotes a frame, 81a denotes a frame rear end vertical wall, and 81b denotes a frame step portion. 82 is a key and 83 is a key fulcrum. Only one white key is shown.

The rear end 82b of the key 82 is connected to the frame rear end vertical wall 81a via the key fulcrum 83 so that the key 82 can rotate about the key fulcrum 83. When the key is released, the key 82 is returned to its original position by a spring or the like (not shown).
Reference numeral 82a denotes a stopper piece, which protrudes from the lower portion of the portion where the key 82 becomes wider on the player side (the front end of the black key), and faces the stopper 4 formed of a cushioning material such as felt. The stopper 4 is provided on the front after sensor 5, and the front after sensor 5 is installed on the player side of the frame step portion 81b. The front after sensor 5 is provided in common for all keys.
A key switch for detecting key press is not shown. The key switch may be a simple one circuit (one make) or a two circuit (two make) detecting initial touch (key pressing speed). Further, the key depression may be detected by a key deviation position detection sensor such as a photosensor that detects the amount of reflected light.

When the performer depresses the key 82, first, a key switch (not shown) is turned on. When the performer is further depressed, the stopper piece 82a presses the front after sensor 5 through the stopper 4 and is pressed from the front after sensor 5. Pressure information is output, and based on the information, the characteristics of the tone being generated are after-controlled.
Accordingly, since the front after sensor 5 detects the key pressing pressure in front of the key 82, it is difficult to detect the key pressing pressure when the rear (back side) of the key 82 is pressed.
Further, the information on the key pressing pressure obtained is one-dimensional, and it is insufficient as an input device for realizing various changes found in a live musical instrument.

On the other hand, a keyboard device provided with a sensor for detecting a key pressing pressure when the key 82 is pressed behind is known (see Patent Document 1).
The keyboard device is configured such that a key is connected via a serial connection portion of a flexible portion (hinge portion) having flexibility in a key pressing direction and a flexible portion (hinge portion) having flexibility in a key arrangement direction. The rear end of the elastic member 82 is elastically supported by the support member, and the distortion of the flexible portion is detected (FIG. 1), or the pressure by the elastic body inserted into the flexible portion is detected (FIG. 5). A sensor is provided.
However, since the distortion and pressure detected in the flexible part of the conventional keyboard device described above are small, the ability to detect the key pressing pressure is small.

Furthermore, a keyboard for an electronic musical instrument in which an after sensor is provided on the front side and the rear side of the key is known (see Patent Document 2).
FIG. 9 is a longitudinal sectional side view showing an outline of another conventional electronic musical instrument keyboard.
In the figure, 91 is a frame body, 92 is a frame sub-body, 93 is a switch board, and 94 is a key.
The key 94 has a substantially U-shaped cross-section with an open bottom surface, and is attached to the frame sub-body 92 via a connecting rod 95 and leaf springs 96 and 97.
The first switch 98 and the second switch 99 provided on the switch board 93 are sequentially pressed by the actuators 94a and 94b projecting from the lower end of the key 94 to detect touch (key pressing speed). The pressure sensitive sensor 100 is deformed by the connecting rod 95.
The lower limit value of the key contact pieces 94c and 94d is limited to the stoppers 101 and 102. Each of the stoppers 101 and 102 is provided with an after touch sensor (after sensor).

FIG. 10 is an operation explanatory diagram of another conventional electronic musical instrument keyboard shown in FIG.
In FIG. 10A, when the player side of the key 94 is pressed by the finger 111, the key 94 is counterclockwise around the first fulcrum part A against the spring force of the leaf springs 96, 97 of FIG. Rotate in the direction. When the lower limit value of the key abutment piece 94 c is limited by the stopper 101, an output signal is output from an after sensor provided in the stopper 101.
In FIG. 10B, when the intermediate portion of the key 94 is pressed by the finger 111, the key 94 moves down while maintaining the substantially horizontal state against the spring force of the leaf springs 96 and 97. When the key is further depressed, the contact pieces 94c and 94d contact the stoppers 101 and 102, respectively, and output signals are output from the after sensors provided in the stoppers 101 and 102, respectively.
In FIG. 10C, when the back side of the key 94 is pressed by the finger 111, the key 94 rotates clockwise around the second fulcrum part B against the spring force of the leaf springs 96 and 97. . When the lower limit value of the key abutment piece 94d is limited by the stopper 102, an output signal is output from an after sensor provided in the stopper 102.
The output signals of the after sensors provided in the first switch 98, the second switch 99, the pressure sensitive sensor 100, and the stoppers 101 and 102 are used for tone control.

The prior art described with reference to FIGS. 9 and 10 is difficult to handle as after-control. Because the keyboard is a special keyboard that assumes that the up / down deviation behind the key is the same as the up / down deviation in front of the key. Since the above-mentioned deviation amount (distance) is large, it cannot be controlled well. Contrary to this, the change in the value of the musical tone control parameter becomes too large.
In this prior art, output signals are output from the front side after sensor and the rear side after sensor, but it has not been studied how to control the sound.
Japanese Utility Model Publication No. 3-31799 JP-A-7-36445

The present invention has been made to solve the above-described problems, and it is an object of the present invention to provide a keyboard device for an electronic musical instrument that facilitates an after-touch method of pressing the back of a key. .
In addition, it is an object of the present invention to provide a keyboard device for an electronic musical instrument that realizes two-dimensional after-control by using an after-touch performance method of pressing a key in front of the key.

According to the present invention, in the keyboard device for an electronic musical instrument provided with a plurality of keys whose rear ends are swingably held with respect to the fixed frame and a key pressing operation detecting means, The connecting portion is provided between the rear end and the fixed frame, and when the rear side of the key is further pressed after the start of the key pressing operation, the connecting portion is biased within the elastic limit and sinks the rear side of the key. The key-pressing operation detecting means includes a rear after sensor that detects the sinking of the rear side of each key for each key after the key-pressing operation of each key is started.
Therefore, the amount of sinking (distance) on the rear side of the key whose rear end is swingably held with respect to the fixed frame does not increase so much, and the aftertouch method of pushing the rear of the key becomes easy.

According to a second aspect of the present invention, in the electronic musical instrument keyboard device according to the first aspect, the connection portion is a hinge fulcrum that connects the rear end to the key support portion of the fixed frame for each key, The rear after sensor is installed on the fixed frame at the lower rear side of each key, and is pressed by the lower rear part of each key for each key after the key pressing operation is started.
Therefore, it is possible to detect the key pressing pressure when the rear side of the key is pressed directly and efficiently. It is possible to easily detect the key pressing pressure when the key is pushed behind the key device with a slight change to the existing electronic musical instrument keyboard device having the hinge fulcrum.
You may make it provide a back projection part in each key as a back lower part mentioned above.

According to a third aspect of the present invention, in the keyboard device for an electronic musical instrument according to the first aspect, the connection unit includes a key support unit in which the rear end of each key is connected via a key fulcrum, and the key. A flexible frame that connects the support portion to the fixed frame for each key, and the rear after sensor is installed on the fixed frame at the lower rear side of each key, and after each key press operation, It is pressed by the rear lower part.
Therefore, it is possible to detect the key pressing pressure when the rear side of the key is pressed directly and efficiently.
When the rear of the key is easily depressed by simply changing the frame structure of an existing keyboard device for an electronic musical instrument that has a key support part connected to the rear end of each key via a key fulcrum for each key. The key pressing pressure can be detected.
Considering which one is cheaper and easier to change between frame change and key change, the key is made elaborately, used in many models, and it is practical to separately mold the keyboard with only one model. Considering that there is almost no point, it is possible to produce a keyboard device that can control the key rear aftertouch only by changing the frame without manufacturing a new key structure. It contributes to the development of industry.
Moreover, it replaces with the back after sensor mentioned above, a back after sensor may be installed on a flexible frame, and may detect the distortion by bending of a flexible frame after a key press operation start.
You may make it provide a back projection part in each key as a back lower part mentioned above.

According to a fourth aspect of the present invention, in the electronic musical instrument keyboard device according to any one of the first to third aspects, the rear after sensor is provided in common for all keys, and a detection signal common to all keys is transmitted. Output.
Therefore, the process of performing the after control using the output signal of the rear after sensor is simplified.

According to a fifth aspect of the present invention, in the electronic musical instrument keyboard device according to any one of the first to fourth aspects, the key pressing operation detecting means is configured to switch each key for each key after the key pressing operation starts. And a front after sensor for detecting the sinking of the front side of the musical instrument, and the characteristics of the musical tone produced by the electronic musical instrument are controlled after by the combination of the output signal of the rear after sensor and the output signal of the front after sensor.
Therefore, two-dimensional after control is realized by using the output signal of the rear after sensor and the output signal of the front after sensor together.

According to the present invention, the amount of deviation behind the key does not increase so much, so that it is easy for the performer to control the aftertouch technique performed by pressing the back of the key.
In addition, since the two-dimensional after control is realized, there is an effect that various musical tone changes can be finely controlled for the performer.

FIG. 1 is a schematic configuration diagram for explaining a first embodiment of the present invention.
In the figure, reference numeral 1 denotes a frame (fixed frame), 1a denotes a frame rear end vertical wall, and 1b denotes a frame step portion.
2 is a key, 2a is a stopper piece, 2b is a hinge fulcrum, 2c is a rear projection, and 2d is a rear end. Only the white key is shown. The rear protrusion 2c is intended to act as an over-sink prevention protrusion when the key rear end push-in method is used even in a keyboard device without after-sensor control, as shown in the key described later with reference to FIG. Met. This is because the hinge part may be broken without this.
The stopper piece 2 a is the same as the stopper piece 82 a in FIG. 8, faces the same stopper 4 as in FIG. 8, and the front after sensor 5 is provided under the stopper 4.
The rear projection 2c protrudes from the side surface or the inside of the key 2 and is provided at a position facing the rear after sensor 3 on the frame 1 with a predetermined gap.
The rear after sensor 3 is the same as the front after sensor 5 and is a pressure-sensitive sensor that detects a pressing force. The rear after sensor 3 also uses the output signal in common for all keys.

The rear protrusion 2 c may press the rear after sensor 3 via a stopper similar to the stopper 4. If there is the rear projection 2c, the gap and the contact surface with the rear after sensor 3 can be finely adjusted, but when this is omitted and the key 2 is pushed down, the rear end 2d or side surface of the key 2 May directly contact the rear after-sensor 3.
The rear end 2d of the key 2 is connected to the frame rear end vertical wall 1a that supports the key via a hinge fulcrum 2b that has elasticity and is thin and easily bent. The hinge fulcrum 2b serves as a connecting portion, and the key 2 is rotatable by bending within the elastic limit.
Only one white key is shown as an example of the key 2, but the same applies to other white keys and black keys. However, the stopper piece of the black key is at the end on the player side, is substantially at the same position as the stopper piece 2a, and faces the stopper 4 and the front after sensor 5.

When the performer depresses the key 2 (the player side) in front of the key 2 to turn on a key switch (not shown) and then presses it further, the stopper piece 2c presses the front after sensor 5 through the stopper 4. The pressing force information is output from the front after sensor 5.
If the performer shifts the pressing position backward while pressing the key 2, the hinge fulcrum 2b is bent. As a result, the key 2 rotates around the tip of the stopper piece 1c while the stopper piece 1c presses the front after sensor 5, and the rear protrusion 2c also presses the rear after sensor 3. The pressing force information is output from.

In addition to the pressing force itself, the pressing force detected by the rear after sensor 3 and the front after sensor 5 also changes depending on the front and rear positions of the pressing position.
Since the pressing force when the back of the key is pressed is directly applied to the rear after-sensor 3, as in the second conventional example, the pressing force is less in the sensor than the detection of the hinge fulcrum distortion. It will be transmitted.
Although the front after sensor 5 is provided in FIG. 1, the front after sensor 5 may not be provided in the case where it is only necessary to detect the pressing force when the key is pushed rearward and to control the musical tone after the key.

FIG. 2 is an explanatory diagram in the case of controlling the characteristics of the musical tone using the two after sensors shown in FIG.
FIG. 2A is an explanatory diagram for obtaining a two-dimensional output in accordance with the pressing force and the pressing position.
The magnitude of the output of the front after sensor 5 is assigned to the horizontal axis, and the magnitude of the output of the rear after sensor 3 is assigned to the vertical axis. In normal keystrokes, a large force is not applied during the sound generation after the key depression operation, so the output of both the front after sensor 5 and the rear after sensor 3 is small. However, when the entire key 2 is strongly pressed, the front after sensor 5 and the rear after sensor The output of all three is increased.

  On the other hand, when the front of the key 2 is pushed in greatly, the output of the front after sensor 5 becomes large, and the output of the rear after sensor 3 becomes 0 or close to 0 completely. On the contrary, when the rear end 2d side of the key 2 is pushed in greatly, the output of the rear after sensor 3 becomes large, and the output of the front after sensor 5 becomes completely zero or close to zero.

The front after sensor 5 and the rear after sensor when the pressing force applied during sound generation after the key pressing operation of the key 2 is gradually increased or the pressing position from the front end to the rear end 2d of the key 2 is gradually shifted. The output of 3 will change gradually.
As described above, it is possible to capture a change in the key pressing pressure in the pitching direction of the key in a two-dimensional manner, and performance information based on the information obtained therefrom can also show a two-dimensional spread. . As a result, a deep performance expression that has not been possible in the past can be achieved.

FIG. 2B is an explanatory diagram of a specific example in which the tone characteristics are after-controlled according to the outputs of the two after-sensors. It is assumed that the musical tone control parameters for after-controlling the characteristics of musical tones are preset in the storage device by gradually changing their values. This figure shows the storage area as a conversion table.
A value (difference value) obtained by designating a column of the conversion table by the sum (addition value) of the output value of the front after sensor 5 and the output value of the rear after sensor 3 and subtracting the output value of the rear after sensor 3 from the output value of the front after sensor 5 ) To specify the row of the conversion table. The musical tone control parameter is read from the cell designated by the designated column and row.

As the after control, modulation (modulation) such as vibrato, tremolo, and wah wah (modulation is applied to the cut-off frequency of the low-pass filter) is generally executed.
In addition, the player can freely control the key pressing position to change the delay time of the delayed signal to be fed back (flutter effect), change the distortion (distortion), and wah wah mute (push down) like a trumpet. Depending on the key position, an open tone can be changed to a mute closed tone).
Two types are selected from the tone control parameters for controlling these, and two-dimensional after control is performed.

As a first specific example, as the added value increases, the output volume of the musical sound is increased, and as the difference value increases in the positive direction, the cutoff frequency of the low-pass filter is increased to brighten the musical tone. As the difference value increases in the negative direction, the cut-off frequency of the low-pass filter is lowered to darken the tone of the musical tone.
As a second specific example, the vibrato rate (speed) increases as the added value increases, the vibrato depth increases as the difference value increases in the positive direction, and the vibrato increases as the difference value increases in the negative direction. Reduce the depth.

FIG. 3 is a block diagram showing an example of an electronic musical instrument that performs after-control as shown in FIG. 2 using the two after-sensors shown in FIG.
The outputs of the front after sensor 5 and the rear after sensor 3 are amplified by the preamplifiers 11 and 12, respectively, and then input to the subtracting unit 13 and the adding unit 14. The difference value and the addition value are input to the microcomputer 17 via the amplifiers 15 and 16, respectively.
On the other hand, the on / off state of the key switch for detecting the key depression of each key not shown in FIG. 1 is detected by scanning by the detection circuit 19, and there is information identifying the key depressed and the key released. The data is output to the microcomputer 17.

The microcomputer 17 outputs a key number, key-on data, key-off data, etc. to the sound source unit 20 in accordance with the output of the detection circuit 19, and synthesizes a musical sound signal having a pitch corresponding to the depressed key to the sound source 20. And output via the sound system 21.
The microcomputer 17 includes an A / D converter that converts the difference value and the addition value into a digital value. The conversion table shown in FIG. 2B is stored in the ROM 18. The microcomputer 17 designates the address of the ROM 18 according to the difference value and the addition value, reads out the musical tone control parameter, sets it in the sound source unit 19, and performs after-control on the characteristics of the musical tone being sounded.

The microcomputer 17 also detects the operation of various setting switches via the detection circuit 19 and outputs a tone control parameter to the sound source unit 20 to set the tone of the tone (instrument tone), Set the control characteristics.
In the above description, addition / subtraction is executed by an analog circuit, but it may be executed by digital calculation inside the microcomputer 17.

FIG. 4 is a perspective view for explaining a specific example of the embodiment shown in FIG.
Since the sinking of the rear end of the key in a keyboard device (for example, Japanese Patent Laid-Open No. 10-240229) using a hinge fulcrum that has been practically used in the past is used, the configuration only needs to be changed slightly.
In the figure, 31 is a frame (fixed frame), 32a is a white key body, 33a is a black key body, 34a is a white key body, 35a is a black key body, and 36a is a white key body.
This keyboard has a keyboard structure of one octave unit in which three key units are stacked in three stages.

In the black key unit, the rear ends 33h, 35h of the black key main body portions 33a, 35a,... For one octave are connected to the key common support portion 37 via a connecting portion described later so as to be swingable in the key pressing direction. It has a structured.
The first white key unit is similarly connected to the key common support portion 39 through the connection portion at the rear end 34h of the three white key main body portions 34a,... The second white key unit has four white key main bodies 32a, 36a,... Of the respective pitches of C, E, G, and B, and the rear ends 32h and 36h in the same manner via the connecting portions. The structure is connected to the common support portion 38.
The key common support part 37 of the black key unit, the key common support part 38 of the second white key unit, and the key common support part 39 of the first white key unit are stacked. Reference numeral 40 denotes a flange that protrudes from the side surface of the key common support portion 38 and is locked to a recess provided on the side surface of the key common support portion of the adjacent octave key unit. Reference numeral 41 denotes a screw hole provided in the upper part of the key common support part 37. Reference numeral 42 denotes a fixing screw hole with an upper case or an operation panel (not shown).

  At the rear end 33h of the black key main body 33a, there is a thick portion 33b extending in the width direction of the key. It is connected to the. A gate corresponding portion 33e protrudes from the thick portion 33b between the two thin portions 33c and 33d. The gate corresponding portion 33e is a portion where resin is injected when the black key unit is molded. These are connecting portions that connect between the black key main body portion 33a and the key common support portion 37 of the black key unit, and in particular, the two thin portions 33c and 33d correspond to the hinge fulcrum 2b in FIG.

Similarly, the black key body 35a has a thick portion 35b, thin portions 35c and 35d, and a gate corresponding portion 35e, and serves as a connection portion to the key common support portion 37 of the black key unit.
As for the white key body portion 32a, the thick portion 32b and the thin portions 32c and 32d are visible in the figure, and only the gate corresponding portion 34e is visible with respect to the white key body portion 34a. Although the shape of the connection portion is slightly different depending on each key, both are connected to each key common support portion by two thin portions.

Reference numeral 43 denotes a rear after sensor, which corresponds to the rear after sensor 3 in FIG. 1, and is installed on an inclined surface 31 b on the back side of the step portion 31 a of the frame 31.
A rear protrusion 32f is provided on both sides of the rear side of the white key main body 32a. When the performer depresses the key more strongly after pressing the key, the rear protrusion 32f presses the rear after sensor 43.

FIG. 5 is a partial cross-sectional view of one embodiment shown in FIG.
In the figure, the same parts as those in FIG. The laminated body of the key common support portion 37 of the black key unit, the key common support portion 38 of the second white key unit, and the key common support portion 39 of the first white key unit is inserted from the screw hole 41 (FIG. 4). The screw 51 is fixed to the frame 31 by being screwed into the screw boss 31c.
A switch board 52 is mounted on the inclined surface on the performer side of the frame step portion 31a, and a key switch 53 for the white key body portion 32a, a key switch 54 for the black key body portion 33a, and the like are installed thereon. Yes.
55 is a stopper, and 56 is a front after sensor.

The after control operation will be described with reference to FIGS.
The stopper piece 32g presses the front after sensor 56 when the player presses the player side of the white key body 32a to turn on the key switch 53 and then presses it further.
By shifting the position in the depth direction of the depression, the rear projection 32f comes into contact with the rear after sensor 43 and presses it. At this time, the inclined surface 31b is substantially parallel to the key lower surface.

When the rear side of the white key main body 32 a is pressed, the thin portions 32 c and 32 d are bent, and the rear protrusion 32 f presses the rear after sensor 43. During this time, the thin portions 32c and 32d are kept within the elastic limit.
The gap between the rear protrusion 32 f and the rear after sensor 43 depends on the thickness of the thin portions 32 c and 32 d, the length in the front-rear direction, the material, and the like. Since the structure is such that 32h is swingably held, it is a little less than 1mm.
Accordingly, since the sink when pressing the rear side of the white key main body 32a is within 1 mm, the sink that biases the rear end 32h of the key is small, and the player can easily control the pressing force.

  For the other black key main body portions 33a and 35a, the white key main body portion 35a, etc., the stopper pieces and the rear protrusions are provided at the same positions. When the player presses the key more strongly after pressing, the stopper piece 32g presses the front after sensor 56, the rear protrusion presses the rear after sensor 43, or both depending on the pressing position. It comes to be.

FIG. 6 is a schematic configuration diagram for explaining a second embodiment of the present invention.
In the figure, reference numeral 61 denotes a frame, 61a denotes a frame rear end vertical wall, and 61b denotes a frame step portion.
62 is a key, 62a is a stopper piece, 62b is a rear protrusion, and 62c is a rear end. As with the conventional key 82 shown in FIG. 8, the rear end 62c of the key 62 is connected to the frame rear end vertical wall 61a via the key fulcrum 63 so that the key 62 can rotate about the key fulcrum 63. Has been.

In this embodiment, the key pressing pressure to the rear of the key is detected by bending the rear end side of the frame 61.
Unlike the conventional frame 81 shown in FIG. 8, a slit portion 61c having a predetermined length is formed at the boundary between the key 62 and a key adjacent to the key 62 from the frame rear end vertical wall (key support portion) 61a in front of the key. Is provided. The slit portion 61c allows the rear region (flexible frame) 61d of the frame (fixed frame) 61 to be flexed within its elastic limit independently for each key due to the key pressing pressure to the rear of each key. Yes.
Corresponding to each key 62, the rear after sensor 3 similar to that shown in FIG. 1 is disposed on the frame 61 which is opposed to the rear protrusion 62b with a predetermined gap and has no slit 61c.

With the above-described configuration, when the stopper piece 62a of the key 62 comes into contact with the stopper 4 and presses the front after sensor 5 after a normal key depression, the performer moves the finger to move behind the key 62. By pushing, the key 62 rotates around the tip of the stopper piece 62a.
At that time, since the rear region 61d of the frame 61 is notched by the slit portion 61c, the key 62 is bent within the elastic limit for each key. As a result, the rear of the key 62 sinks to the frame 61 side together with the key fulcrum portion 63. Will be included.
The sinking continues until the rear protrusion 62b contacts the frame 61, and the rear protrusion 62b presses the rear after sensor 3.
Also in this embodiment, the two-dimensional musical sound control described with reference to FIGS. 2 and 3 can be performed in the same manner as the embodiment described with reference to FIG. Further, one-dimensional after control can be performed without providing the front after sensor 5.

FIG. 7 is a schematic configuration diagram for explaining a third embodiment of the present invention.
71 is a key, 71a is a stopper piece, 71b is a rear projection, and 71c is a rear end. At the key fulcrum 63, the key 71 and the frame rear end vertical wall 61a are coupled so that the key 71 is rotatable.
The frame 61 and the key fulcrum 63 are the same as those of the embodiment described with reference to FIG. 6, and the rear region 61d of the frame 61 provided with the slit portion 61a is bent within the elastic limit, thereby The pressing force is detected.
Reference numeral 72 denotes a plurality of rear after sensors provided corresponding to each key, and is installed between the slit portions 61 a of the rear region 61 d of the frame 61, for example. The rear after sensor 72 is a strain sensor that detects the bending of the sticking surface, and detects the bending of the rear end side of the frame 61.

Similar to the embodiment described with reference to FIG. 6, when the stopper piece 62a of the key 62 comes to press the front after sensor 5 after the normal key depression, the performer moves the finger to move the key. By pushing the rear of 62, the rear area 61d of the frame 61 is bent for each key. The rear after sensor 72 detects the bending of the rear region 61d and outputs an output signal corresponding to the distortion.
The bending continues until the rear protrusion 71 b comes into contact with the frame 61 due to the sinking of the rear of the key 71. Meanwhile, the bending of the rear region 61d of the frame 61 is prevented from exceeding the elastic limit.
In the embodiment described with reference to FIGS. 6 and 7, instead of the key fulcrum 63, the hinge fulcrum 2 b shown in FIG. Both of these deflections may be used.

In the embodiment described with reference to FIG. 7, the two-dimensional musical sound control described with reference to FIGS. 2 and 3 can be performed in the same manner as the embodiment described with reference to FIG. Further, one-dimensional musical sound control can be performed without providing the front after sensor 5.
In this embodiment, since the rear after sensor 72 is provided for each key, for example, by connecting them in series, the output signal of the rear after sensor 72 is commonly used for all keys.
However, an output signal may be taken out from each rear after sensor 72 independently for each key, and independent tone control may be performed for each key. At that time, if the front after sensor 5 is also provided corresponding to each key, two-dimensional control independent for each key can be performed.
On the other hand, in other embodiments, if the rear after sensor 3 and the front after sensor 5 are individually provided corresponding to each key, independent two-dimensional control can be performed for each key.

In the above description, a case has been described in which the characteristics of a musical tone being sounded are controlled two-dimensionally.
Conventionally, a horizontal after sensor for detecting a pressing force in the width direction of a key and a pressing position in the width direction is known (for example, a pair of left and right after sensors described in JP-A-4-146495). After sensor unit 50).
Therefore, by adding this horizontal after sensor, it becomes possible to detect a three-dimensional pressing force and to realize a three-dimensional change in timbre expression.

It is a schematic block diagram for demonstrating the 1st Embodiment of this invention. It is a block block diagram which shows an example of the electronic musical instrument which performs after-control as shown in FIG. 2 using the two after sensors shown in FIG. It is a block block diagram which shows an example of the electronic musical instrument which controls the characteristic of a musical tone using the two after sensors shown in FIG. It is a perspective view for demonstrating one specific example of embodiment shown in FIG. FIG. 5 is a partial cross-sectional view of one embodiment shown in FIG. 4. It is a schematic block diagram for demonstrating the 2nd Embodiment of this invention. It is a general | schematic block diagram for demonstrating the 3rd Embodiment of this invention. It is a general | schematic block diagram of the keyboard for electronic musical instruments in which the conventional aftertouch performance method is possible. It is a vertical side view which shows the outline | summary of the other conventional keyboard for electronic musical instruments. It is operation | movement explanatory drawing of the other conventional keyboard for electronic musical instruments shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Frame (fixed frame), 1a ... Frame rear end vertical wall (key support part), 2 ... Key, 2a ... Stopper piece, 2b ... Hinge fulcrum (connection part), 2c ... Back projection part (back lower part), 2d ... rear end, 3 ... rear after sensor, 4 ... stopper, 5 ... front after sensor, 31 ... frame (fixed frame), 37, 38, 39 ... key common support part (key support part), 32a, 34a, 36a ... white key Body part, 33a, 35a ... black key body part, 32g ... stopper piece, {32b, 32c, 32d}, {33b, 33c, 33d, 33e}, {34e}, {35b, 35c, 35d, 35e} ... connection 32f, rear protrusion (lower rear), 32h, 33h, 34h, 35h, 36h, 62c, rear end, 43, rear after sensor, 53, 54, key switch (key pressing operation detecting means), 55, strike 56: Front after sensor, 61: Frame (fixed frame), 61a: Frame rear end vertical wall (key support portion), 61c: Slit portion, 61d: Rear region (flexible frame, connection portion), 62, 71 ... key, 62a, 71a ... stopper piece, 63 ... key fulcrum, 62b, 71b ... rear projection (rear lower part), 62c, 71c ... rear end, 72 ... rear rear sensor, 81 ... frame, 81a ... frame rear end vertical wall , 82 ... key, 82a ... stopper piece, 83 ... key fulcrum

Claims (5)

In a keyboard device for an electronic musical instrument comprising a plurality of keys whose rear ends are swingably held with respect to a fixed frame, and key pressing operation detecting means for detecting a key pressing operation of each key,
Each key is provided between the rear end and the fixed frame, and when the back side of the key is further pressed after the key pressing operation is started, the key is displaced within the elastic limit and sinks the back side of the key. Have a connecting part,
The key pressing operation detecting means includes a rear after sensor that detects the sinking of the rear side of each key for each key after the key pressing operation starts.
A keyboard device for an electronic musical instrument. The connection portion is a hinge fulcrum that connects the rear end to the key support portion of the fixed frame for each key,
The rear after sensor is installed on the fixed frame below the back of each key, and is pressed by the lower back of each key for each key after the key pressing operation starts.
The keyboard device for an electronic musical instrument according to claim 1. The connection part has a key support part connected to the rear end via a key fulcrum for each key, and a flexible frame for connecting the key support part to the fixed frame for each key,
The rear after sensor is installed on the fixed frame below the back of each key, and is pressed by the lower back of each key for each key after the key pressing operation starts.
The keyboard device for an electronic musical instrument according to claim 1. The rear after sensor is provided common to all keys, and outputs a detection signal common to all keys.
The keyboard device for an electronic musical instrument according to any one of claims 1 to 3, wherein the keyboard device is an electronic musical instrument. The key pressing operation detecting means has a front after sensor that detects the sinking of the front side of each key for each key after the key pressing operation is started.
By combining the output signal of the rear after sensor and the output signal of the front after sensor, after-controlling the characteristics of the musical sound produced by the electronic musical instrument,
The keyboard device for an electronic musical instrument according to any one of claims 1 to 4, wherein the keyboard device is an electronic musical instrument.

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