JP3384052B2 - Electronic musical instrument keyboard device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a keyboard device for an electronic musical instrument, and more particularly to a keyboard device for an electronic musical instrument in which a sensor such as a touch sensor is provided on the key itself.

[0002]

2. Description of the Related Art Generally, electronic musical instruments such as electronic organs, electronic pianos, and keyboard-type synthesizers are basically designed to control sound generation by opening and closing a key switch by pressing a key. It is impossible to perform monotonously and express the emotions of the performer like a piano.

Therefore, various techniques for providing a so-called touch response function have been developed in order to change the pronunciation characteristics and enable emotional expression due to a slight difference in force when a key is pressed. This touch response function controls the volume, pitch, tone color, etc. of a musical tone that is generated according to the movement of the player's finger in the rising state at the time of pressing the key and the continuous state of the sound after the key is pressed. It is to call.

In the keyboard device of an electronic musical instrument having such a touch response function, when an electronic component such as a sensor or a light emitting body for display is mounted on the key itself, power is supplied to these electronic components and In order to deliver the output signal from the component to the keyboard device main body side, it is necessary to connect the two by using a wire material or a flexible film having a wiring pattern formed thereon.

However, in the above-mentioned structure, when the key is detached from the key support member, in addition to the usual key detaching work, the connecting / disconnecting work of the wire or the like is required, which deteriorates the assembling workability and the parts. As a result, the space factor decreases as the number of points increases.

In order to solve such a problem, a device as disclosed in, for example, Japanese Patent Laid-Open No. 3-80297 has been developed. This is provided with a distortion sensor for detecting the distortion of the key in each key constituting the keyboard, and with a tone control means for controlling a tone based on the output of the distortion sensor. A technique is disclosed in which a conductive film for touch sensing is provided on the surface and electric wiring to the conductive film is performed by relaying a key fulcrum having a large sliding area.

[0007]

However, the keyboard device for an electronic musical instrument disclosed in the above publication has the following problems. That is, if a slight burr or the like occurs between the contact member insert-molded on the key fulcrum having a large sliding area and the mold portion forming the key fulcrum, appropriate friction and smooth sliding of the key fulcrum part are impaired. As a result, the durability is significantly reduced and the secular change becomes severe, which may cause play, contact failure, uneven friction feeling, etc. at the key fulcrum.

Further, in order to solve the above problem, if the contact member is allowed to travel from the mold portion to allow the occurrence of burrs, the sliding area of the fulcrum portion cannot be made large and an appropriate friction feeling can be obtained. There was a problem that was not obtained. This invention was made in view of the above points,
In a keyboard device of an electronic musical instrument having a sensor on the key side, it is an object of the present invention to secure a smooth operation of the key for a long period of time and to easily attach and detach the key from a key supporting member to improve the workability of assembling the key.

[0009]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a key supported by a key support member so that the key can swing freely, and the key is attached between the key and the key support member. A key return spring for imparting a habit of returning, a key guide portion configured to include a guide portion provided on the key support member and a guided portion provided on the key, and a key guide portion for guiding the vertical movement of the key, and the key support member. A first sensor which is provided on each of the keys and which restricts the operating range of the key, and a first sensor which operates from a predetermined stroke position of the key; and a second sensor which is provided on the key and detects key information different from the first sensor. in keyboard apparatus of an electronic musical instrument having the bets, above the stopper portion second
The present invention provides a keyboard device for an electronic musical instrument, which is provided with a conductive means for a sensor.

[0010] Keep <br/> the keyboard apparatus similar to the above electronic musical instrument also provides that provided conductive means to said second sensor to the upper Kikagi guide portion.

[0011]

[Action] keyboard apparatus of an electronic musical instrument according to the present invention by the above-described configuration, the conductive means to the second sensor provided in the key can be performed through the scan stopper portion or the key guides. As a result, it is not necessary to increase the number of parts, the key can be easily attached to and detached from the key support portion, and the workability of assembling the key can be improved.

At the same time, since the conductive means for the second sensor can be taken from a place other than the key fulcrum, it is not necessary to insert a contact member at the fulcrum, and the key can be swung for a long time with appropriate friction and smoothness. It is possible to maintain smooth sliding.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be specifically described below with reference to the drawings. FIG. 1 is a side sectional view showing a first embodiment of the present invention.

The key (white key) 1 is integrally formed of resin in a U-shaped cross section with an open lower surface, and a fulcrum portion 1a having a hemispherical tip is provided at the rear end of the key 1 while the front portion is formed. An L-shaped stopper piece 1b is vertically provided on the lower part of both side walls of the portion, and a contact point actuator 1c is integrated near the front portion of the middle portion in the longitudinal direction, and a partition wall 1d as a reinforcement and spring receiving portion is integrated near the rear portion. To form.

On the other hand, a rear bent portion 2 of a sheet metal keyboard frame (hereinafter simply referred to as "frame") 2 which is a key support member.
A long fulcrum member 3 common to each key is fixed to a, and fulcrum receiving portions 3a are arranged in line on the fulcrum member 3 corresponding to each key. The fulcrum receiving portion 3a is provided with a rear end of the key. The fulcrum portion 1a is swingably supported. When the frame 2 is made of resin, the fulcrum member 3 may be integrally formed with the frame 2.

The front portion of the horizontal portion 2b of the frame 2 is bent downward and then again in the horizontal direction to form a horizontal surface 2c, and the tip portion thereof is further bent upward, and the lower horizontal portion 2c is made of felt or the like. The lower limit stopper 4a is attached to the lower surface of the front part of the upper horizontal portion 2b, and the upper limit stopper 4b is adhered to the stopper piece 1b of the key 1 so as to abut the stopper 1b. Make up. A key guide piece 2d is erected on the upper surface of the front part of the upper horizontal portion 2b by cutting and raising, and a vibration absorbing member 5a such as a soft elastomer or foam is integrally molded on the outer peripheral portion by an outsert to form the key guide 5. Then, the key guide 5 is inserted into both side walls of the key 1 to prevent the key 1 from swinging laterally.

Further, resin substrates 6 are arranged in parallel on the lower surface of the upper horizontal portion 2b of the frame 2 in parallel with each other, and a bowl shape is formed on the substrates 6 corresponding to the contact actuators 1c formed integrally with each key. A flexible contact rubber member 7 having a bulge portion is provided, and each contact rubber member 7 is inserted through the through holes 2e arranged in the frame 2 and protruded upward. Then, when the key is pressed, the contact actuator 1c presses the contact rubber member 7, so that the movable contact 7a brings the non-conducting fixed contact pair 6a formed on the substrate 6 into conduction to turn on the key switch. The first sensor 8 is configured. Board 6
Also, a spring receiver 9 having a pair of contact portions 9a is provided on the substrate 6
It is formed integrally with.

Further, a second sensor 10 composed of a piezoelectric sensor or the like is disposed on the inner surface of the top surface near the key-depressing portion on the key 1 side, and the pair of contact portions 10a, 10a of the second sensor 10 are connected to the inner surface of the top surface. Two printed wirings 10b and 10b along the key 1
A pair of contact portions 11a, 1 of the fixed spring receiver 11 on the partition wall 1d of
1a, and a leaf spring 12 is fitted between the key-side spring bearing 11 and the board-side spring bearing 9 to connect both contact portions 9a, 11
The leaf spring 12 biases the key 1 in the clockwise direction with the fulcrum portion 1a as a fulcrum, and presses the fulcrum portion 1a against the fulcrum receiving portion 3a of the fulcrum member 3.

The leaf spring 12 is composed of a pair of insulated spring materials. For example, as shown in FIG. 2, a pair of spring pieces 12a, 12a are covered with a common flexible insulating material 12b.
Both ends of each spring piece 12a, 12a are made of insulating material 12.
a pair of contact portions 9 of each spring receiver 9 and 11 exposed from b
It is brought into pressure contact with a, 9a, 11a and 11a.

Although the white key and its related members have been described above, the black key and the related members are substantially the same in relation to the related members except that the shape of the black key is different from that of the white key. Detailed description and illustration of the related members are omitted.

Next, the operation of the embodiment configured as described above will be described. When the key 1 is pressed against the biasing force of the leaf spring 12 from the state shown in FIG. 1, the key 1 rotates counterclockwise around the fulcrum portion 1a, and the second sensor 10 on the key side presses the key 1. A voltage proportional to the impact at the time is output, and the output voltage is transmitted to the pair of contact portions 11a, 11a of the key side spring bearing 11 via the printed wirings 10b, 10b, and the spring piece 1 of the leaf spring 12 is transmitted.
2a, 12a and the contact portions 9a, 9a of the board-side spring receiver 9 are input to a touch pressure detection circuit (not shown) provided on the frame 2 side to output a tone control signal.

In parallel with this, when the key 1 rotates counterclockwise by a predetermined angle, the contact actuator 1c presses the contact rubber member 7 to bring the movable contact 7a into pressure contact with the fixed contact pair 6a and turn on the key switch. A signal for instructing the start of a musical tone is output, and this signal is controlled by the musical tone control signal from the second sensor 10 to obtain a touch response effect.

According to the above configuration, it is possible to take in the signal from the second sensor 10 provided on the key side to the touch pressure detection circuit provided on the frame side without increasing the number of parts. Also, the contact portions 9a, 11a of the spring receivers 9, 11
Provides a stable contact pressure due to the spring load of the leaf spring 12, and when the keys are pressed, the contact portions slide against each other and the contact surfaces are abraded by friction, preventing the contact resistance from becoming unstable due to corrosion or the like. To be done.

Further, regarding the attachment / detachment of the key from the frame, there is no need for a separate step of connecting the second sensor on the key side to the detection circuit on the frame side, and the assembly step is exactly the same as the conventional one. And does not reduce the space factor.

FIG. 3 is a side sectional view showing a second embodiment of the present invention in which a part of the first embodiment shown in FIG. 1 is modified, and FIG. 4 is an enlarged sectional view of a part thereof. . In this embodiment and each of the following embodiments, parts corresponding to those in FIG. 1 are designated by the same reference numerals, and description thereof will be omitted.

In the second embodiment, a second sensor 20 made of a touch sensor film such as a pressure sensitive sensor or a plate is formed on the top surface of the key 1, and a recess is formed on the top surface near the rear end of the key 1. The fulcrum portion 1e is formed, and the fulcrum portion 1e is supported by the upper edge portion 2f 'of the slit 2f formed in the rear end bent portion 2a of the frame 2 so as to be vertically swingable. A key-side spring bearing 21 is integrally formed on the front inner surface of the front portion of the fulcrum portion 1e, and concentric annular and circular first and second contact portions 21a, 21b having different diameters are formed on the spring bearing 21. Install in an insulated state.

On the other hand, a spring bearing 19 is formed on the frame 2 so as to correspond to the spring bearing 21.
The same first and second contact portions 19a and 19b as those of No. 1 are arranged so as to be insulated from each other, and the first and second coil springs 22a and 22b are provided between the spring bearing 19 and the spring bearing 21. Disguise,
Via the first and second coil springs 22a and 22b,
The second contact portions 19a, 21a; 19b, 21b are made conductive.

The printed wirings 20a, 20b along the first and second contact portions 21a, 21b of the key-side spring bearing portion 21 respectively on both sides of the top surface and the conductive portion 20 embedded in the top surface are provided.
The first and second contact portions 19a and 19b of the frame-side spring bearing 19 are connected to the pair of contact portions of the second sensor 20 via c and 20d, and the conductive portions 19c are embedded in the spring bearing 19, respectively. It is connected to a detection circuit (not shown) on the substrate 6 via 19d.

The second embodiment is constructed as described above, and when the player's finger touches the second sensor 20 to press a key, the noise level of the second sensor 20 rises, and the noise level on the substrate 6 is increased. The key touch detection circuit provided in the above section detects and detects the key touch. In some cases, the second sensor 20 may not be a contact sensor but may be a pressure detection sensor having a laminated structure of contact detection and pressure detection. In this case, the key touch pressure is detected when the key is pressed, and the pressure of that pressure is detected. Touch response control is performed according to the size.

Also in this embodiment, no special component is required to capture the output of the second sensor 20 on the substrate 6, and the key 1 can be easily attached to and detached from the frame 2, and the assembling workability and the space factor can be improved. Of the spring bearing 19 and the first and second contact portions 19a and 19b of the spring bearing 19 and the first and second contact portions 21a and 21b of the spring bearing 21 are the first and second coils when the key is pressed. Since the springs 22a and 22b are polished by sliding on the end faces, a good contact state can be maintained for a long period of time.

Next, FIG. 5 is a perspective view showing an essential part of the third embodiment of the present invention, in which a second sensor 20 such as a pressure-sensitive sensor similar to the second embodiment is mounted on the top surface of the key 1. The horizontal portion 1 of the stopper portion 1b is disposed through the conductive portion 20e embedded in the stopper piece 1b of the key 1, and the one contact portion of the second sensor 20 is disposed.
It is connected to the conductive plates 31a and 31b attached to the lower and upper surfaces of b '.

Further, the other contact portion of the second sensor 20 is connected to one terminal of the detection circuit on the substrate through a single leaf spring for returning the key as in the first embodiment, for example, while the key is connected. 1
Of the lower limit stopper 4a and the upper limit stopper 4b (FIG. 1) that regulate the swinging range of the contact points 32a, 32 made of fine mesh-like metal fibers in the portions corresponding to the conductive plates 31a, 31b.
b, and the contact portions 32a and 32b are connected to the wire members 33a and 33b.
It is connected to the other terminal of the detection circuit on the board by b.

In the third embodiment described above, a further force is applied after the lower surface of the stopper portion 1b has landed on the lower limit stopper 4a by pressing a key, and the effect sound such as vibrato due to after-touch is controlled according to the force. At the same time, since the upper surface of the stopper 1b is always in contact with the upper limit stopper 4b, it is possible to transmit a signal when the key is touched before the key is pressed.

According to this structure, the output signal from the second sensor 20 provided on the key side is taken into the board side through the stopper piece 1b, but the stopper piece 1b is largely separated from the key fulcrum portion. Since it is in the position, even if it is guided by the key guide, it is displaced within a very small range (0.1 to 0.8 mm) and the contact portions of the conductive plates 31a and 31b and the contact portions 32a and 32b are slightly changed every time the key is pressed. The contact portions of the two are polished over the entire surface, and reliable contact is always possible.

In the third embodiment, by providing the lower limit stopper 4a with the contact portion 32a to the second sensor 20 on the key side, the second sensor 20 is kept in a non-conducting state when the key is released. The position does not change and the operation position is always accurate. The stopper contact feeling after a predetermined stroke at the time of key depression matches the operation position and the operation timing, and a sensationally natural stopper feeling can be obtained.

Further, by providing the contact portion 32b to the second sensor 20 on the key side on the upper limit stopper 4b, the stopper disengagement position on the stroke at the time of key depression and the contact portion off operation timing coincide with each other, and the sensor is sensuously sensed. It is possible to obtain a natural feel of a stopper and to control various musical tones by the time from when the player's finger is off for one make-up (or two make-up) to when the key is completely released.

FIG. 6 shows a fourth embodiment of the present invention in which a part of the above-mentioned third embodiment is modified, and a plurality of articles (three articles in FIG. 6) are provided on the top surface of one key 1. Second sensor 40a, 4
0b, 40c, ... Are provided and each second sensor 40a, 4
0b, 40c, ... Conductive parts 41a, 41b, 41 arranged on the lower surface of the stopper part 1b via conductive parts 40d, 40e, 40f ,.
Connect to c, ...

Then, a plurality of contact portions 42 corresponding thereto
A sub-board 46 includes a lower limit stopper 44a made of zebra rubber or the like in which a is arranged in a row for a plurality of keys, and a diode matrix circuit (not shown) having a plurality of diodes D.
It is mounted on top and its circuit output is connected to a detection circuit on the main board (not shown) via the SE connector. Further, the other contact portion of each of the second sensors 40a, 40b, 40c, ... Is connected to the detection circuit on the main board through a key return leaf spring as in the third embodiment.

In the fourth embodiment, in addition to the effect of the third embodiment, a plurality of electric signals output from a plurality of second sensors of one key can be easily transmitted to the substrate side via a lower limit stopper. It becomes possible to deliver. Thus, by providing a plurality of sensors on the key or providing a large number of switches in the longitudinal direction of the key, it is possible to detect which part of the key the player's finger is touching. In this case, the presense information is not necessary in the case of a scooping and the like, and it is preferable that the presense information can be detected only after playing.

Next, FIG. 7 is a cross-sectional view showing only the main part of the fifth embodiment of the present invention, in which the second sensor 50a consisting of two lines of touch sensor film or plate on the top surface of the key 1. 5
0b is formed, and the second sensors 50a and 50b are connected to conductive surfaces 50e and 50f formed on the inner surface of the key having a U-shaped cross section through conductive portions 50c and 50d embedded in the key 1, respectively.

The vibration absorbing members 55a and 55b made of an elastic conductive material such as soft elastomer or foam are provided on the outer peripheral portion of the insulating key guide piece 52d in which the inner surface of the key 1 thus constructed is erected on the frame side. Are vertically guided by an integrally formed key guide 55, and two projections 5 are elastically inscribed on the inner surface of the key on both the upper and lower sides of the vibration absorbing members 55a and 55b.
5c is formed to form a four-point sliding type key guide portion, and the vibration absorbing members 55a and 55b are connected to the detection circuit on the substrate by the wire rod 55d.

In the fifth embodiment, the second sensor 50a,
Output signals from 50b are conductive parts 50c and 50d, conductive surfaces 50e and 50f, vibration absorbing members 55a and 55b, and wire 55.
It is taken into the detection circuit provided on the substrate side via d and 55d.

As a result, the finger of the performer can move the finger of the player from the second sensor 50a on the key side to how long before the key switch is turned on by pressing the key.
If 50b is touched, that is, in the case of a one-make switch, until the switch is turned on, in the case of a two-make switch, the time until the one-make switch is turned on and one
It is possible to control the musical sound by detecting the time from when the makeup is switched off to when the second sensor is switched off.

In the fifth embodiment, the output from the second sensor provided on the key side is transmitted to the board side via the key guide portion. In this case, the key cross section is formed in a U-shape. Since both side walls are elastically deformable, the key guide 5
Since the projections 55c of the vibration absorbing members 55a and 55b of No. 5 also have some elasticity, the contact between the key 1 and the key guide 55 can be kept good for a long time.

Further, FIG. 8 is a perspective view showing a sixth embodiment of the present invention, and FIG. 9 is a sectional view showing only the main part thereof. In this embodiment, the rear end bent portion of the frame 2 is provided with a second portion on the top surface.
Comb-shaped fulcrum plates 2f are provided independently corresponding to the white key 1 and the black key 1 '(both referred to as "key 1") forming the second sensor 20 similar to that of the embodiment. A thin portion 2'is provided in the bent portion to apply elastic force to the fulcrum plate 2f, so that each fulcrum plate 2f
As shown in FIG. 9, a boss 2g forming a fulcrum portion is provided on the f, and the boss 2g is engaged with a fulcrum support 1g having a V-shaped cross section formed at the rear end of the key 1 to swing the key 1. The fulcrum plate 2f is elastically supported and movable in the front-back direction by a predetermined range. In addition, a gap corresponding to a predetermined amount of displacement in the front-rear direction is provided in advance between the white key 1 and the black key 1 ', and a fulcrum caused by the longitudinal movement of the key 1 is provided in the vicinity of the bent portion of the fulcrum plate 2f. A strain sensor 60 for detecting elastic strain of the plate 2f is provided.

The frame 2 is also provided with a cut-and-raised portion 2h common to each key, and a front-and-rear movement stopper 4c made of an insulating resin material corresponding to each key is provided on the cut-and-raised portion 2h so as to project rearward. By moving the key 1 back and forth, it is possible to contact and separate from the stopper wall 1h provided on each key. A conductive substrate 61 made of an insulating resin material is integrally formed on the front surface of the cut-and-raised portion 2h, and the pair of contact portions of the second sensor 20 are connected to the top surface of the key 1, the stopper wall 1h, the forward / backward movement stopper 4c and the conductive material. The board 61 is taken in on the board of the frame 2 via two electrically conductive portions 61a, 61a which are formed so as to pass through the board 61 and are insulated from each other.

Since the sixth embodiment has the above-mentioned structure, when the player's finger touches the second sensor 20, the second sensor 20
The noise level of the sensor 20 rises, and the detection circuit on the substrate side detects the noise level to judge the key touch, and the key touch pressure is detected by the pressure applied to the key when the key is pressed. Further, the forward / backward movement of the key after the key is depressed can be detected by the strain sensor 60, which is caused by the bending of the fulcrum plate 2f in the forward / backward direction, and various effects and timbres can be controlled by these output signals.

According to the sixth embodiment, since the back and forth movement of the key 1 can be made considerably large, it is possible to easily perceive the back and forth movement feeling of the key by the player's finger. Further, even if the back and forth movement of the key is increased, the strain sensor 60 is only slightly displaced, so that accurate detection can be performed only by the linear portion of the sensor characteristic, and there is a risk of sensor damage due to excessive displacement. Absent.

Further, since the forward / backward movement limit of the key 1 is regulated by the forward / backward movement stopper 4c, the forward / backward movement stopper 4c is used to prevent the player from performing the pre-performance, the normal performance and the after performance. It becomes possible to secure an electrical path from the frame side to the second sensor on the key side that can detect which part of the key the finger is touching. Further, it is also possible to detect the front and rear position of the key by utilizing the fact that the signal of the second sensor on the key side is blocked when the key 1 is displaced rearward and separated from the stopper wall 1h.

In the sixth embodiment, for example, the leaf spring 1
If the key 2 is not sufficiently bent and mounted, the leaf spring 12 may lose its elasticity and fall due to the rearward movement of the key 1. FIG. 10 is a sectional view similar to FIG. 9, showing only the essential parts of a seventh embodiment of the present invention which solves this problem. In this seventh embodiment, the leaf spring 12 for key return of the previous sixth embodiment is used.
Is changed to a tension coil spring 72, and this coil spring 72
The spring hook 71 and the frame 2 which are provided on the rear top surface of each key.
The coil spring 72 applies a restoring force in the clockwise direction to the key 1 and at the same time presses the fulcrum support 1g on the key side against the fulcrum portion 2g on the frame side. There is. The rest of the configuration and operation are similar to those of the sixth embodiment.

According to the seventh embodiment, the coil spring 72
Since the expansion and contraction range of the key can be sufficiently set, there is no fear that the coil spring 72 loses elasticity and falls when the key is moved backward, and the workability of the spring attachment / detachment at the time of key attachment / detachment can be further improved. become.

[0052]

As described above, the keyboard device for an electronic musical instrument according to the present invention can output the output voltage of the second sensor on the key side without increasing the number of parts while maintaining the component structure of the conventional keyboard device. It becomes possible to transmit to the key support member side.
At the same time, it is possible to prevent deterioration of the assembling workability and the space factor when the key is detached from the key support member.

[0053]

[0054] Then, when so provided on the stopper portion for restricting the operating range of the key the conducting means to said second sensor, the stopper portion is a normal key fulcrum position far,
Even if it is guided by the key guide, it is displaced little by little within the minute range, so that the contact portion with the stopper on the frame side is kept in a polished state on the entire surface, and reliable contact is always possible.

Further, when the above-mentioned conducting means is provided in the key guide portion, the key originally has a U-shaped cross section and both side walls have considerable elasticity, and the key guide also has some elasticity. Therefore, the frictional resistance of the sliding parts of both is weak, and in this case as well, stable contact for a long period of time is possible.

[Brief description of drawings]

FIG. 1 is a side sectional view showing a first embodiment of the present invention.

FIG. 2 is a perspective view showing the shape of the key return leaf spring.

FIG. 3 is a side sectional view showing a second embodiment of the present invention.

FIG. 4 is a sectional view showing a part of the same in an enlarged manner.

FIG. 5 is a perspective view showing an essential part of a third embodiment of the present invention.

FIG. 6 is a perspective view showing a main part of a fourth embodiment of the present invention.

FIG. 7 is a transverse cross-sectional view showing the main parts of the fifth embodiment of the present invention.

FIG. 8 is a perspective view showing a sixth embodiment of the present invention.

FIG. 9 is a sectional view showing the main part of the same.

FIG. 10 is a sectional view showing an essential part of a seventh embodiment of the present invention.

[Explanation of symbols]

1 ... Key, 2 ... Key frame, 3 ... Support member, 4a, 44a
... lower limit stopper, 4b ... upper limit stopper, 4c ... forward / backward movement stopper, 5,55 ... key guide, 6 ... substrate, 7 ... contact rubber member, 8 ... first sensor, 9, 11, 19, 21 ... spring receiver, 10 , 20, 40 ... Second sensor, 12 ... Leaf spring, 2
2a, 22b, 72 ... Coil spring, 60 ... Strain sensor

Continuation of the front page (56) Reference JP 3-80297 (JP, A) JP 7-49688 (JP, A) JP 59-160191 (JP, A) Actual development Sho 58-1994 (JP , U) Actually open 3-6699 (JP, U) Actually open 58-152696 (JP, U) Actually open 3-31798 (JP, U) Patent 2930160 (JP, B2) Patent 2822442 (JP, B2) Actual Kohei 7-27513 (JP, Y2) (58) Fields investigated (Int.Cl. ⁷ , DB name) G10H 1/34 G10B 3/12

Claims (2)

(57) [Claims] 1. A key supported by a key support member so as to be swingable, a key return spring which is engaged between the key and the key support member to impart a return habit to the key, and the key support member. A key guide part that is provided with a guide part and a guided part that is provided on the key and guides the vertical movement of the key, and a stopper part that is provided on the key support member and that limits the operating range of the key. A keyboard device for an electronic musical instrument, comprising: a first sensor that operates from a predetermined stroke position of the key; and a second sensor that is provided on the key and that detects key information different from the first sensor. A keyboard device for an electronic musical instrument, characterized in that conductive means is provided to the second sensor. 2. A key that is swingably supported by a key support member, a key return spring that is engaged between the key and the key support member to give the key a habit of returning, and the key support member. A key guide part that is provided with a guide part and a guided part that is provided on the key and guides the vertical movement of the key, and a stopper part that is provided on the key support member and that limits the operating range of the key. And a first sensor that operates from a predetermined stroke position of the key, and a second sensor that is provided on the key and that detects key information different from the first sensor. A keyboard device for an electronic musical instrument, characterized in that conductive means to the second sensor is provided in the.