JP2930068B2 - Electronic musical instrument drive mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a driving mechanism for a key switch used in an electronic musical instrument having a key operating mechanism such as an electronic keyboard instrument or an electronic wind instrument, or a touch feeling when operating a key of an electronic musical instrument separately from the key switch. The present invention relates to a drive mechanism of an electronic musical instrument as a mechanism for generating a sound.

[0002]

2. Description of the Related Art A keyboard portion of an electronic keyboard instrument is provided with a frame as a minimum member, a key, and a key switch which is turned on / off by a key operation as a minimum mechanism. Further, the electronic keyboard musical instrument is provided with a touch feeling mechanism for generating a non-linear reaction force on the key when the key is pressed in order to make the touch feeling at the time of the key operation resemble that of an acoustic piano.

As one example, a key is pressed so that an actuator thereof presses an elastic member such as a dome-shaped (bowl-shaped) rubber, and as the key is pressed down, a continuous buckling action is applied to the elastic member. , A touch feeling (mainly a static touch feeling) is obtained in which the reaction force received by the finger in the latter half of the key depression is reduced.

[0004] As another example, a key having a large touch is driven by driving a hammer having a large mass in conjunction with a key, and a jack or a let-off member is interposed between the key and the hammer to depress a key. There are also things that can provide a touch feeling that comes out at the end. In that case, there are a key switch driven by a key and a key switch driven by a hammer.

[0005] As such a drive mechanism which also serves as a key switch and a touch-sensitive member, for example, there is one as shown in FIGS. 21 and 22. FIG. 21 is a longitudinal sectional view of the same, and FIG. 22 is a perspective view seen from above a rear portion excluding the actuator.

The drive mechanism includes a base 201 mounted and fixed on the printed circuit board 100 and a hinge 2 at one end.
02 is connected to at least the other end of the driven body 203 rotatably supported by the base unit 201 by the base unit 201, and biases the driven body 203 upward by inclining the driven body 203 with respect to the base unit. And a skirt portion (bulging portion) 204 for holding the same is formed integrally with an elastic member such as rubber.

The actuator 3 is a driving means provided on a rocking member such as a key or a hammer (not shown).
As a result, the intermediate portion between the one end portion and the other end portion of the driven body 203 is pressed, so that the driven body 203 rotates about the hinge portion 202 as a rotation fulcrum.

The driven body 203 has an actuator receiving portion 203b formed on the upper surface 203a thereof in a projecting manner, and the actuator receiving portion 203b has a lower surface at a position closer to the hinge 202 and a position closer to the tip of the skirt 204 from the actuator receiving portion 203b. Two inner dome-shaped movable contact holding portions 203c and 203d having movable contacts 205 and 206 are provided. On the upper surface of the substrate 100 facing each of the movable contacts 205 and 206, a fixed contact 10 composed of a pair of conductive patterns is provided.
1 and 102, a two-make type touch response comprising a first switch SW1 and a second switch SW2.
Configure the switch.

According to such a driving mechanism, the actuator 300 as the driving means is actuated by the key depression.
Abuts against the actuator receiving portion 203b, and presses it against the urging force of the skirt portion 204. As a result, the driven body 203 pivots downward about the hinge 202 as a pivot, and the movable contact 205 closer to the hinge 202 first comes into contact with the fixed contact 101 and the first switch S
W1 turns on and then the other movable contact 206
Abuts on the fixed contact 102 to turn on the second switch SW2.

A key depression is detected by turning on the two switches SW1 and SW2, and a first switch SW1 is turned on.
The touch response information corresponding to the key-depression speed can be obtained by the time difference from when the second switch SW2 is turned on until the second switch SW2 is turned on, and the volume and tone of the musical tone generated thereby and their envelopes are controlled. Can be. In the latter half of the key press, the skirt portion 20 having elasticity is used.
4, a continuous buckling action is generated, and a touch feeling in which the reaction force applied to the finger is reduced is obtained.

[0011]

However, in such a conventional driving mechanism, generally, one actuator makes one contact portion abut on a driven body during a driving stroke thereof to move it. Due to the pressing drive, the operation of the driven body controlled by the operation of the actuator has been simple. Then, since the same portion of the driven body is always pressed and driven by contacting the actuator, it is liable to wear due to long-term use, and there is also a problem in durability.

Another example of a drive mechanism for a two-make touch response switch of a conventional electronic musical instrument is a mass body linked to a key as shown in US Pat. No. 4,901,614. A hammer is provided with an actuator having a pair of abutting portions as a driving means, and a glasses-type rubber switch is provided on a printed circuit board. Each contact portion of the actuator is sequentially turned into a glasses-type rubber by turning the hammer when a key is pressed. There is also a configuration in which a pair of switch portions of a switch come into contact with each other and are sequentially turned on.

However, also in this case, the contact portion of the actuator which first comes into contact with the rubber switch always presses the rubber switch with a stronger force than the other contact portion during the driving stroke. Adhesion easily occurs between the inner surface of the hollow portion of the rubber switch and the inner surface, and there is a problem in terms of durability. Further, the pressing force of the actuator on the rubber switch simply increases in accordance with the driving stroke, so that it was not possible to realize an operation for obtaining a variety of touch feelings.

The present invention has been made to solve such a problem in a drive mechanism of an electronic musical instrument.
A first object is to increase the durability of a driven body so that its function does not change over a long period of time. A second object is to realize an operation for obtaining various touch feelings.

[0015]

In order to achieve the above object, a drive mechanism for an electronic musical instrument according to the present invention has one end rotatably supported by a fixed member and is urged in a predetermined direction from the fixed member. A driving mechanism for an electronic musical instrument, the driving mechanism comprising: a driven body; and a driving unit configured to press and rotate the driven body against the urging force thereof, wherein the driving unit includes a plurality of contact portions, During the drive stroke of the drive means, the plurality of contact portions sequentially contact the driven body, and at least two contact portions have a moment when both contact the driven body, before and after the moment. The driven body and the driving means having the plurality of contact portions are arranged so that the contact portion which presses the driven body most strongly among the plurality of contact portions is replaced. .

With this configuration, different portions of the driven body are sequentially pressed by the plurality of abutting portions of the driving means, and the most strongly pressed portion also changes. Therefore, the same portion is constantly pressed strongly. And the durability is improved. Further, the relationship between the drive stroke of the driving means and the timing at which the contact portions that mainly press the driven body by simultaneously contacting the driven body with the plurality of contact portions can be set can be variously set. Since the number of contact portions can be increased, it is also possible to realize an operation for obtaining various touch feelings.

If the driving means is provided with an actuator integrally formed with a plurality of abutting portions, the positional accuracy between the abutting portions is enhanced, and the abutting portions which mainly press the driven body are provided. Variations in replacement timing can be prevented. Further, by providing the actuator so as to be rotatable with respect to a fixed rotation fulcrum, it is possible to provide a plurality of abutting portions of different speeds, which efficiently and stably operate in a limited space.

Furthermore, in these electronic musical instrument drive mechanisms, if the movable body of the switch is provided on the driven body and the fixed part of the switch is provided on the surface of the fixed member facing the movable part, durability can be improved. A high key switch drive mechanism can be configured. This switch is not limited to a contact-contact type switch, but may be an optical switch using a photosensor and a reflector, or a magnetic switch using a magnet and a reed switch.

In this case, the movable portions of the plurality of switches are provided at intervals on the driven body, and the fixed portions of the plurality of switches are provided on a surface of the fixed member facing the movable portions. It is possible to obtain an accurate two-make or more touch response switch.

[0020]

Embodiments of the present invention will be specifically described below with reference to the drawings. [First Embodiment: FIGS. 1 to 3] FIG. 1 shows a first embodiment of the present invention.
1 is a perspective view of a keyboard device showing an embodiment of the present invention, and FIG. 2 is a side sectional view of the keyboard device. FIG. 2 is a sectional view taken along line AA of FIG. In the figures, the mass and the switch part are shown in side view. This keyboard device is used for electronic musical instruments, and the shelf plate (bottom plate) of the instrument body
A sound source unit (not shown) is placed behind 52, and this keyboard device is provided in front (front).

The keyboard device is roughly composed of a chassis 10 as a support member and a key support portion 12 of the chassis 10.
The key 20 is composed of a required number of white keys and black keys rotatably supported via a fulcrum 21 and the mass supporter 15 of the chassis 10 located below each key 20. And a hammer 30 which is a freely disposed mass body.

More specifically, the key 20 and the hammer 30 are provided by fork-type urging members (springs) 41 whose ends are in contact with the fulcrum 31a of the key 20 and the hammer 30.
Is pressed against the chassis 10. The return force to the key 20 is not due to the spring 41, but the rightward force in FIG. 1 is turned by the rotating force of the hammer 30 due to its own weight by the force transmitting portions 31b and 31c.
4 (see FIG. 2) is transmitted to the hammer driving section 23 of the key 20 to urge the key to return. That is, the spring 41 is used to move the key 20 and the hammer 3 from the chassis 10.
This is for preventing 0 from dropping.

The force transmitting portions 31b, 31 of the hammer 30
In the vicinity of the fulcrum 31a on the hammer side near c, a key switch driving actuator 33 integrally formed with the first actuator part a1 and the second actuator part a2 is provided. The flexible elastic body M shown in FIG. 2 of the key switch SW, which is a detecting means for detecting a key operation, is pressed.

The key switch SW is disposed in a through hole 14 formed in a key switch mounting portion 19 in front of the chassis 10, and details thereof will be described later. In this embodiment, the key 20, the hammer 30, and the actuator 33 function as a driving unit that presses and rotates a later-described driven body of the key switch SW. The first actuator part a1 and the second actuator part a2 of the actuator 33 are a plurality of contact parts that contact the driven body.

In FIG. 1, reference numeral 43 denotes a chassis 10
, A stopper for overpressing the key when an infant rides on the keyboard device, 42 is a key guide for white keys,
Reference numeral 16 denotes a reinforcing rib wall connecting the rear portion 17 of the chassis and the horizontal portion 11 of the chassis, reference numeral 44 denotes a key guide for a black key, and reference numeral 46 denotes a key and a stopper for a hammer for keeping the key depressed.

FIG. 3 is a sectional side view of the key switch SW. FIG. 3 is a side sectional view of the key switch section taken along line BB in FIG. 1 and viewed in the direction of the arrow. As shown in FIGS. 2 and 3, the key switch SW includes a printed circuit board 50 as a fixing member, and a flexible elastic body M positioned and mounted on the upper surface thereof.

The flexible elastic body M comprises a base portion bs fixed on the substrate 50 and a bulging portion sa.
a is a driven body sd one end of which is rotatably connected to a base portion bs via a hinge portion hg, and an outer dome-shaped flexible skirt connected to the periphery including the other end portion excluding the hinge portion hg. Sk, which are integrally formed of a resin having rubber properties. The driven body sd is formed by a hinge hg and a skirt sk.
It is urged in a direction (upward) away from the printed circuit board 50.

The key switch SW is a two-make type touch response switch of a contact time difference type. Two sets of fixed contacts f1 and f2 in a comb-like fixed contact pattern are provided on the upper surface of a printed board 50 as a fixed member. Are formed. An inner dome-shaped first sensor section se1 and a second sensor section formed on the driven body sd so as to project downward from the lower surface thereof so as to face the fixed contacts f1 and f2, respectively.
The movable contacts as1 and as2 made of conductive rubber or the like are provided on the lower surface of the sensor section se2.

The first and second sensor sections se of the driven body sd
Reference numeral 1, se2 comprises thin portions t1, t2 acting as shock absorbers after the movable contacts as1, as2 abut against the fixed contacts f1, f2, and concave portions h1, h2 in which the movable contacts as1, as2 can move.

The key 20 and the hammer 30 are located on the lower surface of the driven body sd so as to face the actuator receiving portion ac2.
A projection p having elasticity for accelerating the return of the swinging member is integrally formed, and its upper surface is defined as a second actuator receiving portion ac2. Then, the first actuator receiving portion ac1 is provided at a position farther from the hinge portion hg on the upper surface side than the second actuator receiving portion ac2.

Then, by the rotation of the hammer 30 at the time of key depression, the first actuator part a1 comes into contact with the first actuator receiving part ac1 and the second actuator part a2 comes into contact with the second actuator receiving part ac2 in sequence to be driven. The body sd is pressed and driven. Here, the first and second actuator portions a1 and a2 of the hammer 30 and the movable contacts as1 and as2 and the fixed contacts f1 and f2 of the switch SW.
FIG. 3 shows the positional relationship between
The actuator part a1 and the second movable contact as2, and the second actuator part a2 and the first movable contact as1 are arranged at different positions.

The second actuator part a2 and the projection p are disposed so as to be substantially coincident on the vertical axis v passing through the projection p at the time of pushing off. The first actuator section a1
And the second movable contact as2 is not displaced or arranged on the same vertical axis, but does not change much in operation.

With such an arrangement, when the first actuator receiving part ac1 is pressed by the first actuator part a1, the driven body sd turns rightward in FIG. 3 around the hinge part hg as a fulcrum. The hinge portion hg is connected to the base portion b
It is formed above the end surface k of the concave portion provided so as to extend slightly outside the rising surface u1 of the driven body portion sd from the upper surface of s.

Therefore, the rising surface u1 and the end surface k are displaced from the vertical axis. This allows
The hinge portion hg facilitates the rotation of the driven body sd after the protrusion p comes into contact with the contact portion e of the substrate 50. Then, the skirt portion sk spreads outward in the horizontal direction at the same time as the rotation of the driven body sd, the first movable contact as1 comes into contact with the first fixed contact f1, and then the thin portion t1 of the first sensor portion se1 is removed. The second movable contact as2 contacts the second fixed contact f2. At this time, the projections p are simultaneously brought into contact with the contact portions e of the substrate 50 or are configured to be slightly separated from each other.

Then, in the case of the configuration slightly separated from the
Thereafter, the thin portion t2 of the second sensor portion se2 is deformed,
Subsequently, the protrusion p comes into contact with the contact portion e of the substrate 50. At the same or slightly later timing, the rear portion 32 of the mass concentration portion 31 opposite to the force transmitting portion of the hammer 30 shown in FIG. 1 contacts the thick hammer stopper (felt material) 47 fixed to the chassis 10. Hammer 30 and key 20 in contact
To stop. When the key is normally pressed (mp to f), the protrusion p
Is slightly bent, but the stronger the key, the more
The amount of deflection of the projection p also increases.

The elastic deformation action of the flexible elastic body M will be described in more detail. The driven body sd includes first and second actuator receiving portions ac1 and ac2, and first and second actuator portions a and a.
When sequentially pressed by 1 and a2, the projection p is compressed and deformed by the displacement after the switch SW is turned on.

The operation of the switch at the time of key release is exactly opposite to the case of key depression. Then, the force of the printed circuit board 50 pressing the protrusion p immediately after the key release becomes greater as the key is pressed more strongly, so that not only the return of the switch is improved, but also the return of the hammer 30 and the key 20 which are swing members. Will be better. The better the return, the lower the incidence of chattering in a chain. That is, a touch response switch with less malfunction can be realized.

Further, according to this embodiment, as can be seen from FIG. 2, in the actuator 33, the first actuator portion a1 which is the first abutting portion has a distance from the support portion (fulcrum portion) 15 of the hammer 30. And the second actuator portion a2, which is the second contact portion, is disposed so that the distance is longer.

As can be seen from FIGS. 2 and 3, the flexible elastic body M in the key switch SW is the driven body sd
The hinge hg connecting one end of the base to the base is the hammer 3
The first sensor section se1 provided on the driven body sd of the printed circuit board 50 as a fixing member is located closer to the hinge section hg than the second sensor section se2. Is smaller than the distance between the second sensor unit se2 and the substrate 50.

Therefore, when the hammer 30 pivots to the left in FIG. 2 in conjunction with the depression of the key 20 when the key is depressed, the actuator 33 moves together with it and the first actuator part a1 is driven first. The body sd contacts the first actuator receiving portion ac1 and presses it against the biasing force of the hinge portion hg and the skirt portion sk. Thereby, the driven body part sd rotates rightward in FIG. 3 with the hinge part hg as a rotation fulcrum, and the first movable contact as1 becomes the first movable contact as1.
To the fixed contact f1.

Thereafter, the second actuator section a2 of the actuator 33 descends at a higher speed than the first actuator section a1, so that the first and second actuator sections are driven by the first and second actuators sd. Actuator receiving part a
There is a moment when both come into contact with c1 and ac2,
Even if only the actuator portion a2 of the first embodiment continues to contact the second actuator receiving portion ac2 to press and drive the driven body sd, or the first actuator portion a1 also keeps contacting the second actuator receiving portion ac2. The pressing force becomes weaker than that of the first actuator part a1.

As described above, during the driving stroke of the actuator 33, the actuator portion (contact portion) which mainly presses and drives the non-driving body sd is replaced.
That is, the distribution of the pressing force during the driving stroke of the driven body sd by the actuator 33 is such that only the first actuator portion a1 or at least the first actuator portion a1 is main at the beginning of the pressing stroke, and at the later stage of the pressing stroke. Only the second actuator section a2 or at least the second actuator section a2 is mainly used. Therefore,
The touch feel changes during the key operation, and the timing can be set arbitrarily.

Then, in the latter half of the pressing stroke, the driven body sd further pivots rightward in FIG. 3 with the hinge hg as a rotation fulcrum, and the second movable contact as2 comes into contact with the second fixed contact f2. Therefore, in the initial stage of the pressing stroke at the time of key pressing, the first actuator portion a1 that is closer to the support portion 15 of the hammer 30 is mainly connected to the first actuator receiving portion that is farther from the hinge portion hg of the driven body sd. By pressing and driving ac1, the first sensor unit se1 closer to the hinge hg is operated at a relatively high speed with a predetermined stroke.

Thereafter, the second actuator portion a2, which is farther from the support portion 15 of the hammer 30, is moved down at a faster descending speed than the first actuator receiving portion ac1, and the second actuator portion a2, which is closer to the hinge portion of the driven body sd. By pressing and driving the portion ac2, the second sensor portion se2 farther from the hinge portion hg is operated at the same speed as the first sensor portion se1.

Therefore, the switches using the movable contact and the fixed contact of each sensor section se1 and se2 are turned on relatively quickly at the same speed, and the accuracy of the time difference when each contact is turned on is improved. Touch response information that faithfully reflects the state can be obtained. Also, 1
During the entire stroke when the key is pressed, the first actuator receiving portion a
Since c1 and the second actuator receiving portion ac2 are substantially equal in the integrated value of the force received by being pressed by the first actuator portion a1 or the second actuator portion a1,
Part of the driven body sd does not wear fast,
The durability is improved.

Further, in this embodiment, since the first actuator part a1 and the second actuator part a1, which are the contact parts, are formed integrally with the actuator 33 provided on the hammer 30, the two actuator parts a1, a2 The positional accuracy between the keys is good, and the timing at which the actuator (contact portion) that mainly presses the driven body sd is replaced does not vary for each key.

The actuator 33 is provided with a hammer 3
Since it is rotatably provided with the 0 support portion 15 as a rotation fulcrum, it is possible to provide a plurality of actuator portions (contact portions) of different speeds which operate efficiently and stably in a limited space. Therefore, according to the first embodiment, both the first purpose of improving the durability of the driven body in the drive mechanism of the electronic musical instrument and the second purpose of obtaining various touch feelings are achieved. can do.

In this embodiment, the driven member sd such as a key switch is pressed by an actuator provided on the hammer 30 in conjunction with the pressing of the key 20.
The driven body sd may be configured to be pressed by an actuator provided directly on the key 20. For example, a fulcrum of a key (not shown) is provided on the right side of FIG. 3, actuator portions a1 and a2 are provided on the lower surface of the key, and actuator receiving portions ac1 and ac2 of the driven body portion sd are depressed. The configuration may be similar to that of FIG.

[Second Embodiment: FIGS. 4 to 7] Next, a second embodiment of the present invention will be described with reference to FIGS. 4 and 5 are side views showing an embodiment of a driving mechanism using a white key. FIG. 4 shows a state in which a key is not pressed (a virtual line is immediately after the start of key pressing), and FIG. FIG. 6 shows a state in which it is in contact with a non-driving body, and FIG. In these drawings, parts corresponding to those in FIGS. 1 to 3 are denoted by the same reference numerals. The driving mechanism using the black key is configured in the same manner except that the shape of the key is different.

The key 20 is swingably supported by a fulcrum 21 at a rear end rising portion (not shown) of the chassis (frame) 10 as in the case of the first embodiment. At a middle portion of the key 20 in the longitudinal direction, three-stage cam-shaped pressing portions 25a, 25b, and 25c are formed. The first actuator 33a, the second actuator 33b, and the third actuator 33 are provided on the chassis 10 at positions corresponding to the pressing portions 25a, 25b, and 25c.
c are coil springs 34a, 34b, 34, respectively.
The key 20 is urged in the direction approaching the key 20 by c, and is fitted so as to be vertically displaceable.

On the lower side of the chassis 10, a printed circuit board 50 as a fixing member is arranged in parallel so as to face the chassis 10.
Is fixed, and the base portion 6b of the driven body 6 is
Is fixed, and the driven body 6 is rotatably supported by the base portion 6b via a hinge portion 6c. The driven body 6
Is provided with a skirt portion made of an elastic material as in the first embodiment, and is urged in a direction away from the printed circuit board 50 by the elastic force of the hinge portion 6c, as shown in FIG. A return force to the inclined position is provided.

When the key 20 is in a non-pressed state shown by a solid line in FIG. 4, each of the actuators 33a, 33b, 33c
Are located slightly away from the upper surface 6a of the driven body 6. Then, when the key 20 is pressed as shown by an arrow P in FIG. 4, the pressing portion 25a first contacts the first actuator 33a and presses it downward at the initial stage, and the first actuator 33a is pressed at the position shown by the phantom line. The lower end contact portion a of the actuator 33a contacts the upper surface 6a of the driven body 6, and presses it downward. Accordingly, the driven body 6 rotates in the arrow Q direction against the urging force with the hinge 6c as a fulcrum.

Next, the pressing portion 25b of the key 20 also contacts the second actuator 33b and presses it downward.
Since the pressing portion 25b has a longer distance from the fulcrum portion 21 than the pressing portion 25a, the pressing speed of the pressing portion 25b pressing the second actuator 33b is higher than the pressing speed of the pressing portion 25a pressing the first actuator 33a. Faster, in the position shown in FIG. 5, the second actuator 33b catches up with the first actuator 33a and their lower end abutments a, b
At the moment when both touch the upper surface 6a of the driven body 6.

Thereafter, the second actuator 33b presses the driven body 6 to rotate further, and the lower end contact portion a of the first actuator 33a is separated from the driven body 6.
From the position shown in FIG. 5, the pressing portion 25c of the key 20 also comes into contact with the third actuator 33c, and presses the third actuator 33c at a higher speed than the pressing portion 25b.

Therefore, the third actuator 3
The moment 3c catches up with the second actuator 33b, and the moment when the lower end contact portions b and c both contact the upper surface of the driven body 6 occurs. After that, the third actuator 33c
Presses the driven body 6 to further rotate, the lower end contact portion a of the second actuator 33b is separated from the driven body 6,
The state shown in FIG. 6 is obtained.

As described above, in the second embodiment, the key 20 and the three actuators 33a, 33b, and 33c having the lower end contact portions a, b, and c respectively press the driven body 6 as a whole. Key 2
During the zero drive stroke, three actuators 33a,
The contact portions a, b, and c of 33b and 33c are sequentially driven 6
And the moment when the two actuators both come into contact with the upper surface of the driven body 6, and before and after that, the actuator that presses the driven body 6 alternates.

If the relative velocities of the first, second, and third actuators 33a, 33b, and 33c with respect to the contact surfaces of the driven members are V1, V2, and V3, respectively, the following is obtained. V1 <V2 <V3

As described above, as the key is depressed, the first, second and third actuators 33a, 33b and 33c are pressed against the urging force of the coil springs 34a, 34b and 34c, and the reaction force is applied to the pressing portion. It is given to the key 20 via 25a, 25b, 25c. Therefore, by sequentially switching the arm lengths of the rotational moment of the key, if the strength of each of the coil springs 34a, 34b, 34c is the same, it is possible to make the touch feel lighter as the key is pressed.

That is, a three-stage touch feeling can be obtained, and the stroke position at which the touch changes depends on the height of each pressing portion 25a, 25b, 25c of the key 20, the length of the actuators 33a, 33b, 33c, and the like. Can be set arbitrarily by changing. If the number of pressing portions of the key 20 and the number of actuators are further increased, it is possible to obtain a touch feeling that changes in more steps.

Further, since the driven body 6 is pressed and driven by the actuators at substantially three locations, the durability is improved. Therefore, according to the second embodiment as well, both the first purpose of improving the durability of the driven body in the driving mechanism of the electronic musical instrument and the second purpose of obtaining various touch feelings are achieved. be able to.

Further, as shown in the sectional view of FIG. 7, the three
Are provided, and fixed contacts f1, f2, f3 are provided on the upper surface of the printed circuit board 50 so as to face the respective movable contacts, and three switches SW1, SW2, By configuring the SW3, a three-make type touch response switch can be configured.

Since the speed of the actuator pressing the driven body 6 increases as the end of the key-pressing stroke approaches, the three switches SW1, SW2, SW3 at the time of key-pressing.
Can be prevented from slowing down where the contact speed of the movable contact and the fixed contact when they are sequentially turned on is normally slow, thereby improving the balance of the contact speed of each contact, and as a result, Accurate touch response information is always obtained.

[Third Embodiment: FIGS. 8 and 9] Next, a third embodiment of the present invention will be described with reference to FIGS. FIG. 8 is a side view showing an embodiment of a driving mechanism using a white key, and FIG. 9 is an explanatory diagram of the actuator. In FIG. 8, parts corresponding to those in FIGS. 1 to 6 are denoted by the same reference numerals. The driving mechanism using the black key is configured in the same manner except that the key shape is different.

In this embodiment, similarly to the second embodiment, the key 20 is swingably supported by a fulcrum 21 at a rear end rising portion (not shown) of the chassis (frame) 10. A pressing portion 25d swelling downward in a spherical or cylindrical shape is formed at a middle portion in the longitudinal direction of the key 20, and the actuator 35 is vertically moved on the chassis 10 at a position facing the pressing portion 25d. It is freely inserted.

The actuator 35 has a plate-shaped pressure receiving portion 35c at the upper end, and a first contact portion 35a and a second contact portion 35b at the lower end with a space in the longitudinal direction of the key 20.
It is urged upward by the coil sprink 34, and the pressure receiving portion 35 c is always in contact with the pressing portion 25 d of the key 20. Therefore, in the third embodiment 2, the key 2
0 and the actuator 35 constitute a driving unit having a plurality of contact portions.

When the key 20 is depressed in the direction of arrow P from the non-depressed state shown by the solid line in FIG. 8, the key 20 swings about the fulcrum 21 as shown by the imaginary line, and the pressing portion 25 d of the actuator 35 By pressing the pressure receiving portion 35c, the spring 3
The actuator 35 is pressed down against the urging force of No. 4.
As a result, first, the first contact portion 35a comes into contact with the upper surface 6a of the driven body 6, and presses and drives the driven body 6, and the arrow Q
Rotate in the direction. Thereafter, the second contact portion 35b also contacts the upper surface 6a of the driven body 6, as indicated by a virtual line in FIG.
Thereafter, only the second contact portion 35b contacts the driven body 6, and further rotates it in the arrow Q direction.

Accordingly, a touch feeling that changes in two stages can be obtained. In addition, since the driven body 6 is pressed and driven by the actuator 35 at two substantially equally distributed positions, the durability is improved. Further, as in the case of the above-described embodiment, the movable contacts of a plurality of switches are provided on the lower surface side of the driven body 6, and the fixed contacts are provided on the upper surface of the printed circuit board 50 so as to face the respective movable contacts. Alternatively, a two-make or three-make touch response switch that can always obtain accurate touch response information can be configured.

According to this embodiment, the key 20 and the actuator 35 perform the function of the driving means. The actuator 35 has a first contact portion 35a and a second contact portion 35b formed integrally. Therefore, the precision of the dimension S shown in FIG. 9 is high, and the first contact portion 35a and the second contact portion 3
The accuracy of the timing at which both of the members 5b and 5b come into contact with the driven body 6 can be improved. Then, before and after the timing, the contact portion for pressing and driving the driven body 6 is changed, so that the touch feeling changes.

Therefore, according to the second embodiment, both the first purpose of improving the durability of the driven body in the drive mechanism of the electronic musical instrument and the second purpose of obtaining various touch feelings can be obtained. Can be achieved.

[Fourth Embodiment: FIGS. 10 to 12] Next, a fourth embodiment of the present invention will be described with reference to FIGS. 10 and 11 are side views showing an embodiment of a driving mechanism using a white key. FIG. 10 shows a state at the initial stage of key depression, FIG. 11 shows a state at the end stage of key depression, and FIG. 12 is an explanatory diagram of the actuator. It is. 10 and 11
, The same reference numerals are given to portions corresponding to FIGS. 1 to 6. The driving mechanism using the black key is configured in the same manner except that the key shape is different.

As shown in FIGS. 10 and 11, the key 20 has a spherical or cylindrical pressing portion 25e formed on the lower surface of the intermediate portion in the longitudinal direction. A first actuator 36 having a U-shape is rotatably supported by the shaft 13,
8, the upper arm portion 36c is urged rightward in FIG.
0 pressing portion 25e. The lower arm portion 36d is provided with a first contact portion 36a and a second contact portion 36b at intervals in the longitudinal direction of the key 20.

A second actuator 37 having an abutting portion 37a extending downward is integrally provided on the lower surface on the front side of the pressing portion 25e of the key 20, and a first actuator 36 is provided.
Together with the first and second contact portions 36a and 36b,
The abutting portion 37 a of the actuator 37 is opposed to the upper surface 6 a of the driven body 6. Therefore, in the fourth embodiment, the key 20 and the first actuator 36
The second actuator 37 constitutes a driving unit having a plurality of contact portions.

When the key 20 is depressed as shown by the arrow P from the non-depressed state shown by the solid line in FIG. 10, the key 20 swings with respect to the fulcrum 21 as shown by the imaginary line. Presses the first actuator 36 to turn left around the shaft 13. Thereby, the first contact portion 3
6a comes into contact with the upper surface 6a of the driven body 6, and presses and drives it to rotate in the direction indicated by the arrow Q.

Next, by further rotation of the first actuator 36, the second contact portion 36b is moved to the first contact portion 3b.
As shown by an imaginary line in FIG. 10, a descent occurs at a speed higher than the speed at which the driven member 6 comes into contact with the driven body 6 together with the first contact portion 36 a. Thereafter, the second contact portion mainly presses and drives the driven body 6, and the upper surface 6a of the driven body 6 separates from the first contact portion 36a.

Further, since the second actuator 37 descends at a high speed due to the rotation of the key 20 about the fulcrum 21 as the center of rotation, the contact portion 37 catches up with the second contact portion 36b, and FIG. As shown in FIG. 7, the contact portion 37a of the second actuator 37 is
The moment when it comes into contact with the driven body 6 together with the contact portion 36b. Thereafter, the contact portion 37a of the second actuator 37 exclusively presses and drives the driven body 6.

According to this embodiment, the same effects as those of the above-described embodiments can be obtained, and the first actuator 36 is provided rotatably with respect to the shaft 13 which is a fixed rotation fulcrum. In addition, a plurality of contact portions 36a and 36b having different speeds for efficiently and stably operating in a limited space can be provided. Also, the second actuator 37
Also uses the same fulcrum part 21 as the key 20 as a rotation fulcrum,
Since the distance from the pivot point is very long, the descending speed is high.

Further, as in the above-described embodiments, movable contacts of a plurality of switches are provided on the lower surface of the driven body 6 and fixed contacts are provided on the upper surface of the printed circuit board 50 so as to face the movable contacts. Is provided, an accurate two-make or three-make touch response switch can be configured.

In FIG. 12, the first actuator 3
The distances from the shaft 13 which is the rotation fulcrum 6 to the first contact portion 36a and the second contact portion 36b are R1 and R2, respectively, and the first contact portion 36a and the second contact portion 36b Let Va and Vb be the moving speeds of Va and R1, respectively, and there is a relationship Va / R1 = V2 / R2. Therefore, the speed increases as the distance from the pivot point increases.

In each of these embodiments, it is instantaneous that a plurality of actuators or contact portions come into contact with the driven body at the moment, and the actuators or the contact portions that press and drive the driven body before and after are completely replaced. However, when the driven body has flexibility, a plurality of actuators or contact portions continue to contact the driven body, and the period during which the driven body is pressed and driven by them is long. In some cases.
However, even in this case, before and after the moment when the plurality of actuators or the abutting portions are both in contact with the driven body, the actuator or the abutting portion that presses the driven body most strongly is replaced.

[Explanation of Functions of the Present Invention] Here, the functions of the drive mechanism of the electronic musical instrument according to the present invention will be described with reference to FIGS. In FIG. 13, when there are any driven points K1 and K2 separated from the rotation center O of any driven body 6 by distances L1 and L2, assuming that the driving speeds are Vk1 and Vk2, the following relationship is obtained. Holds. Vk1 / Vk2 = L1 / L2 (1)

Then, among the contact portions A1 and A2 of the actuator of the arbitrary driving means, the speed Va1 of A1 when A1 is in contact with K1 is Va1 = Vk1. From the above equation (1), Vk2 = (L2 / L1) Vk1 = (L2 / L1) Va1, so that the magnitude Va2 of the relative speed of the contact portion A2 with the driven point K2 is given by Va2> (L2 / L1) L1) Setting Va1 enables catch-up.

Here, the initial positions of K1, K2, A1, and A2 are set such that the velocities A1v and A1 of the respective abutting portions of the actuator are set such that A1 abuts K1 before A2 abuts K2.
2v is set in consideration. This is the same as passing a dull train ahead of an express train so that it can be overtaken for the first time.

An example of a specific arrangement method will be described with reference to FIG. In the case of a stroke or a rotation operation in a limited section such as a keyboard, as shown in FIG.
The drive mechanism will be easily described by setting the moment when the plurality of contact portions A1 and A2 abut on the driven body 6 and setting the vicinity before and after the moment as the initial position and the open (full stroke) position. be able to.

Here, since the driven body 6 comes into sliding contact with the two contact portions A1 and A2 of the actuator 33 as the driving means, and the actuator 33 has the rotation fulcrum Oa, By comparing the rotation enlargement ratio of the driven body 6 with A2, the effect of the exchange is explained and confirmed.

The contact positions K1, K of the respective contact portions A1, A2 of the actuator 33, which are indicated by solid lines in FIG.
2, the line parallel to the normal direction to the instantaneous contact surface of the driven body 6 intersects with the line connecting the rotation center Oa of the actuator 33 and the rotation center Ok of the driven body 6 with R1 and R1, respectively. R2. The intersections R1 and R2 are line segments O
The ratio of internally dividing k-Oa is the same as that of the actuator 33.
2 shows the rotational expansion ratio of the contact portions A1 and A2 to the driven body 6.

As can be seen from FIG. 14, RA2 / Rk2> R
A1 / Rk1, when the actuator 33 is turned to the left and is at a position shown by a virtual line before the state shown by a solid line in FIG. 14 is reached, the contact portion A1 moves to the position K1 of the driven body 6. As shown in the figure, the slider slides leftward while abutting on the right position and slowly pressing and driving it. Then, the contact portion A2 catches up with the driven body portion 6 at the position indicated by the solid line in FIG. After this state, when the actuator 33 further rotates as shown by the broken line, the contact portion A
1 moves away from the driven body 6, and only the second contact portion A2 drives the driven body 6.

[Other Embodiments: FIGS. 15 to 20] Various other embodiments of the present invention will be described below with reference to FIGS. 15 to 30, which will be briefly described. In each of these drawings, the same reference numerals are given to portions corresponding to FIGS. 1 to 6, and description thereof will be omitted. Each of these figures shows a state at the moment when the two contact portions of the driving means both contact the driven body.

In the above-described embodiments, the key serving also as an actuator or an actuator and the driven body have their rotation fulcrums on opposite sides and have rotated in opposite directions. However, the invention is not limited to this. . As shown in FIG. 15, the key 20 also serving as an actuator and the driven body 6 may have a rotation fulcrum on the same side and rotate in the same direction. This key 20 has two downwardly extending abutting portions (actuator portions) A1, spaced apart in the longitudinal direction.
A2 is integrally formed to constitute the driving means.

In the example shown in FIG. 16, one rectangular parallelepiped block-shaped actuator 38 is formed on the lower surface of the intermediate portion of the key 20 in the longitudinal direction. In this case, the key 20 and the actuator 38 are integral driving means, and the rear lower end (the right end in FIG. 16) of the actuator 38 serves as the first contact portion a, and the lower front end (the left end in FIG. 16). Portion) functions as a second contact portion b, and is equivalent to having two independent contact portions (actuator portions) A1 and A2 as indicated by phantom lines.

In the example shown in FIG. 17, a single polygonal column-shaped actuator 39 is formed on the lower surface of the intermediate portion of the key 20 in the longitudinal direction, and the key 20 and the actuator 39 constitute an integral driving means. ing. The actuator 39
Each of the ridges functions as a contact portion a to f, and is equivalent to a configuration in which a large number of actuators are radially provided as indicated by virtual lines.

The example shown in FIG. 18 shows the upper surface 6a of the driven body 6.
Are provided with two projections 6e and 6f at intervals in the longitudinal direction, and the key 20 also serves as an actuator of the driving means. However, the key 20 is not provided with an actuator portion or a protruding contact portion, and as shown in FIG.
e, 6f, the position of the key 20 that contacts the two contact portions a,
Functions as b.

The example shown in FIG. 19 shows the upper surface 6a of the driven body 6.
Is provided with one projection 6e, and one projection 20a is also provided on the lower surface 6a of the key 20, which also serves as an actuator of the driving means. The portion on the lower surface of the key 20 that contacts the protrusion 6e functions as a first contact portion, and the protrusion 20a serves as a second contact portion.

FIG. 20 shows the simplest embodiment, in which neither the key 20 nor the driven member 6 is provided with an actuator portion or a projection. The front end of the upper surface of the driving body 6 (FIG. 20)
The right end portion of the driven member 6 first contacts the lower surface of the key 20, so that the contact portion functions as a first contact portion a, and thereafter, the rear end portion of the upper surface of the driven body 6 (FIG. At the left end)
Since the key 20 contacts the lower surface of the key 20, the contact portion functions as a second contact portion b.

In these embodiments, the key 20 also serving as the actuator of the driving means is provided with an actuator portion or a contact portion directly, or the key also serves as the actuator. However, as in the first embodiment, the key 20 An actuator or an abutment may be provided on an interlocking member such as a hammer that rotates in conjunction with the interlocking member, or the interlocking member may also serve as the actuator.

Further, it is a matter of course that a key contact or a touch response switch may be formed by providing a movable contact on the driven body 6 and a fixed contact on a fixed member such as a printed circuit board. The switch is not limited to a contact contact type switch, but may be an optical switch using a photo sensor and a reflector, a magnetic switch using a magnet and a reed switch, or the like.

Also in each of these embodiments, the contact portion (actuator portion) that presses the driven body 6 in a state before and after the keystroke stroke of the key 20 than the illustrated position.
Are replaced, the driven body 6 is not worn locally, the durability is increased, and its function does not change over a long period of time.

As in these embodiments, no switch made of an elastic member is provided between the driven body 6 and the printed circuit board 50, or even if it is provided, its elasticity is relatively weak.
An electronic device according to the present invention may be configured such that an urging force by a spring or the like is not applied to each contact portion, or a weak force is applied to each contact portion, or each contact portion is close to a key fulcrum (a moment is short in arm length). When the drive mechanism of the musical instrument is configured, this drive mechanism has almost no effect on the touch feeling.

The fact that the touch feeling is not affected means that if a desired touch feeling is designed by key return means other than this drive mechanism (such as a key return spring or a return force due to the weight of the hammer), the drive mechanism can be incorporated. This means that the touch feeling hardly changes, and there is also a merit that the design becomes easy. Even in such a case,
According to the present invention, the first object of improving durability can be achieved.

Further, in the case where a touch response switch of two make type or more is provided, the speed at which the switch which is turned on later is turned on can be increased, so that the touch response information based on the contact time difference can be accurately obtained. Can be. Therefore, the accuracy of the touch response switch can be improved.

[0100]

As described above, in the drive mechanism for an electronic musical instrument according to the present invention, the plurality of abutting portions of the actuator successively abut against different positions of the driven body and are alternately driven to be pressed. The driving body does not wear out locally, the durability increases, and its function does not change over a long period of time. In addition, among a plurality of abutting portions of the driving unit that presses the driven body, the abutting portion that mainly drives the driven body alternates during the driving stroke, so that a variety of touch feelings may be generated depending on the design. It is also possible to realize the operation for obtaining.

[Brief description of the drawings]

FIG. 1 is a perspective view of a keyboard device showing a first embodiment of the present invention.

FIG. 2 is a cross-sectional view of the front portion of the keyboard along the line AA in FIG.

FIG. 3 is a cross-sectional view of the key switch section taken along line BB of FIG.

FIG. 4 is a side view of a driving mechanism using a white key according to a second embodiment of the present invention when a key is not pressed;

FIG. 5 is a side view showing a state where the first and second actuators are both in contact with a driven body.

FIG. 6 is a side view showing a state at the end of key depression.

FIG. 7 is a cross-sectional view of a main part showing an example in which a touch response switch is provided on a driven body and a printed circuit board.

FIG. 8 is a side view showing a driving mechanism using a white key according to a second embodiment of the present invention.

FIG. 9 is an explanatory view of the actuator.

FIG. 10 is a side view showing a driving mechanism using a white key according to a third embodiment of the present invention.

FIG. 11 is a side view showing the state at the end of key depression.

FIG. 12 is an explanatory view of the first actuator.

FIG. 13 is a diagram for explaining the function of the drive mechanism of the electronic musical instrument according to the present invention.

FIG. 14 is a diagram for explaining an example of the specific arrangement method.

FIG. 15 is a side view showing an example of another embodiment of the present invention.

FIG. 16 is a side view showing another example of another embodiment of the present invention.

FIG. 17 is a side view showing still another example of another embodiment of the present invention.

FIG. 18 is a side view showing still another example of another embodiment of the present invention.

FIG. 19 is a side view showing still another example of another embodiment of the present invention.

FIG. 20 is a side view showing the simplest example of another embodiment of the present invention.

FIG. 21 is a cross-sectional view illustrating an example of a drive mechanism of a conventional electronic musical instrument.

FIG. 22 is a perspective view of the same except for the actuator.

[Explanation of symbols]

Reference numeral 6: driven body, 6a: upper surface of driven body, 6b: base part, 6c: hinge part, 0: chassis (frame), 15
... Hammer support, 20 ... Key, 21 ... Key fulcrum, 25
a, 25b, 25c: pressing part, 30: hammer (mass), 33: actuator, 33a: first actuator, 33b: second actuator, 33c: third actuator, 34: coil spring, 35: actuator , 35a: first contact portion, 35b: second contact portion, 36: first actuator, 37: second actuator, 50: printed circuit board (fixed component) SW: key switch, a1 ... 1 actuator section, a2: second actuator section, bs, bs2: base section, sa: bulging section, M: flexible elastic body, hg: hinge section, sd: driven body, sk: skirt section, se1 ... First sensor unit, se
2 ... second sensor part, ac1 ... first actuator receiving part, ac2 ... second actuator receiving part, p ... protrusion, a
s1, as2: movable contact, f1, f2: fixed contact,

Claims (5)

(57) [Claims] An end is rotatably supported by a fixed member, and a driven body urged in a predetermined direction from the fixed member is rotated by pressing the driven body against the urging force. A driving mechanism for driving the electronic musical instrument, the driving mechanism comprising: a plurality of abutting portions, wherein the plurality of abutting portions sequentially contact the driven body during a driving stroke of the driving device. An abutment where at least two abutting portions abut against the driven body together, and before and after the instant, the pressing portion that presses the driven body most strongly among the plurality of abutting portions. A driving mechanism for an electronic musical instrument, wherein the driven body and a driving unit having the plurality of abutting portions are arranged so that the abutting portions are alternated. 2. The drive mechanism for an electronic musical instrument according to claim 1, wherein said drive means includes an actuator integrally formed with said plurality of contact portions. . 3. The drive mechanism for an electronic musical instrument according to claim 2, wherein the actuator is provided rotatably with respect to a fixed rotation fulcrum. 4. The drive mechanism for an electronic musical instrument according to claim 1, wherein a movable portion of a switch is provided on the driven body, and a surface of the fixed member facing the movable portion. A driving mechanism for an electronic musical instrument, further comprising a fixing portion for the switch. 5. The drive mechanism for an electronic musical instrument according to claim 4, wherein each movable portion of a plurality of switches is provided at an interval on the driven body, and a surface of the fixed member opposed to each movable portion. A driving mechanism for an electronic musical instrument, wherein each of the fixed portions of the plurality of switches is provided.