JP3381604B2 - 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, an actuator provided on a swing member such as a key or a hammer interlocked therewith, presses a driven body portion of a detection means such as a key switch. The present invention relates to a keyboard device having a mechanism for performing.

[0002]

2. Description of the Related Art Generally, in an electronic keyboard instrument, a swing member such as a key or a hammer interlocking with the key is swingably arranged with respect to a support member, and is an actuator which is a pusher provided on the key or the hammer. A key release detection sensor such as a key switch is driven by, and the musical sound formed by the musical sound forming means is controlled in real time by the key operation information sensed by the sensor.

A return spring is used as a return means for the swinging member (Japanese Patent Publication No. 5-47836).
A key or hammer that returns by its own weight (Japanese Utility Model Laid-Open No. 54-72023 and JP-A-5-31)
No. 3656), by releasing a bulging rubber member (some of which also serve as a switch) from compression (Japanese Patent Publication No. 6-
31939). In addition, in order to get a feeling of playing like a natural piano grand piano,
Conventionally, there is a keyboard device for an electronic musical instrument having a moving mass body (hammer) therein.

[0004]

In these prior arts, when the restoring force of the rocking member returning means is increased,
However, if the return force is set to be weak, it will be difficult for the player to play a long passage and it will be difficult to play a fast passage. In addition, in the above-mentioned conventional keyboard device with a feeling of resilience, since the inertial mass is increased, the equivalent mass or the inertial mass of all the swinging members in the keyboard device is quickly returned to move. In order to do this, some kind of ingenuity is required.

For example, a pair of actuators (pushers) provided on a hammer, which is a mass body that interlocks with a key, as seen in US Pat. No. 4,901,614, which is a conventional technique of this type.
In a keyboard apparatus in which touch response information is obtained by operating a box-shaped rubber switch provided as detection means for detecting rocking motion, a box-shaped switch that is pressed by an actuator near the switch when a hard key is pressed. Adhesion may occur in the hollow part of the and the touch response sometimes did not work well.

Further, in the electronic musical instrument, a touch-sensitive switch of a two-make type is provided in the detecting unit, and touch response information is obtained by a time difference between the turning on of the first switch and the turning on of the second switch. Many keyboard devices with touch response function are used.
There is also a problem in that the speed at which the first and second switches are turned on differs due to a key depression operation, and if the speed at which the second switch is turned on becomes slow, chattering occurs and accurate touch response information cannot be obtained. there were.

In view of the above background, there has been a demand for a keyboard device for an electronic musical instrument capable of playing a fast passage and a keyboard device for an electronic musical instrument which can always obtain touch response information accurately. Further, the driven body portion of the detection portion has a problem that durability is deteriorated due to long-term use because the same portion is always brought into contact with the actuator to receive a driving force.

Further, as shown in FIG. 14, a base portion 61 fixed on the substrate 50 and an inner dome-shaped movable contact whose one end is connected to the base portion 61 via a hinge portion 62 and which projects downward Driven body portion 6 having (sensor portion) 64
3 and 3 are integrally formed by an elastic member, the driven body portion 63 is given an elastic return force from the hinge portion 62 to the inclined position shown in the figure, and the key swings around the fulcrum portion 21 when the key is pressed. The driven body portion 63 is pressed and driven by the actuator portion 20a provided on the movable body 20 and is rotated downward to move the movable contact 6
There is a keyboard device in which the key 4 is contacted with the substrate 50 and a pair of fixed contacts 70 formed therein is turned on to detect a key depression.

At this time, the movable contact 64 comes into contact with the fixed contact 70 on the substrate 50 as shown in FIG. 15 by a key stroke in which the position of the tip of the key 20 shown in FIG. 14 is displaced from a to b. After turning on, the actuator portion 20a further presses the driven body portion 63 with the driving force F1 in the arrow P direction due to the overstroke from b to c.
A supporting force F2 is generated on the hinge portion 62. The movable contact 64 receives a reaction force −F3 from the substrate 50 and tries to support the free end side of the driven body portion 63, but the driven body portion 6 cannot be supported.
The lower surface 63a of the No. 3 near the free end collides with the substrate 50 and receives a reaction force (reaction force) −F4 from the substrate 50. As a result, mechanical noise due to impact is generated, and the driven body portion 63 receives a bending moment and is deformed as shown in the drawing, which itself may deteriorate or damage the substrate 50.

The present invention has been made in view of the problems in the conventional keyboard device for an electronic musical instrument, and it is intended to accelerate the return of the swinging member such as a key or hammer to enable a quick passage performance. The purpose of the present invention is to enhance the durability of the detection means and prevent noise generation and deterioration.

[0011]

SUMMARY OF THE INVENTION According to the present invention, a swing member (key or hammer interlocking therewith) swingably supported by a support member and its swing motion are detected when the swing member is pressed. In order to achieve the above-mentioned object, a keyboard device for an electronic musical instrument is provided with a detecting means for operating the rocking member, and an actuator section for driving the detecting means in cooperation with the rocking member when the rocking member swings. The means is configured as follows.

That is, the detecting means includes a base portion and a heater.
And a driven body portion, and a fixing portion for mounting and fixing the base portion. The driven body portion has one end rotatably connected to the base portion via a hinge portion, an actuator receiving portion is provided on the upper surface, and the driven body portion projects downward from the lower surface.
The sensor unit for output provided, and provided with projections having elasticity to the actuator receiving portion opposite to the position of its lower surface,
When the actuator receiving portion is pushed down by the actuator portion, the driven body portion rotates about the hinge portion as a fulcrum of rotation, and the sensor portion of the driven body portion is fixed to the fixed portion.
After contacting the fixed portion, the protrusion is configured to elastically deform .

With such a configuration, the swinging of the swinging member such as the key causes the actuator portion to press the actuator receiving portion of the driven body portion provided in the detecting means, and the driven body portion is rotated. The oscillating member is moved to detect the oscillating movement of the oscillating member, but thereafter, the elastic projection comes into contact with the fixed portion, so that the lower surface of the driven body portion directly collides with the upper surface of the fixed portion. Since the impact from the protrusion is small, the occurrence of mechanical noise is suppressed and the durability is improved.
To do.

Further, elastic energy is stored by elastic deformation of the protrusion after contacting the fixed portion, and when the swing member returns, the protrusion releases the elastic energy to restore the swing member to accelerate the return of the swing member. Act. Therefore, fast passage performance becomes possible.

In such an electronic musical instrument keyboard device,
The detecting means may be fixed to the supporting member or may be mounted in a fixed relation to the supporting member and configured as follows.
That is, this detecting means has a flexible elastic body including a base portion and a bulging portion having a driven body portion provided with a sensor portion below, and a fixing portion for mounting the flexible elastic body. Then, the driven body portion is provided with a hinge portion which is connected to the base portion at one end, an actuator receiving portion is provided on the upper surface, and an elastic member is provided on a lower surface at a position facing the actuator receiving portion.
Providing a protrusion having sex.

Then, when the actuator receiving portion is pushed down by the actuator portion, the driven body portion is configured to rotate about the hinge portion as a fulcrum of rotation, and the projection causes the rotation of the driven body portion. After abutting against the fixed portion, it elastically deforms, and the elastic energy at the time of elastic deformation accelerates the return of the rocking member at the time of return. According to this structure, since the force from the actuator portion directly acts on the protrusion when the key is pressed, a large amount of elastic energy is accumulated in the protrusion, and the return of the swinging member after the key is pressed can be further accelerated.

Further, since the protrusion is provided avoiding the sensor portion such as the contact switch or the optical sensor and the force from the actuator portion is applied thereto, deterioration of the sensor portion can be prevented. In particular, when the sensor unit is a contact switch, the effect is great because an unnecessarily strong force is not applied to the contact.
As with the above-described keyboard device, the generation of Men noise due to the collision of the driven body portion with the fixed portion can be suppressed. It is desirable that the thickness between the upper surface and the lower surface of the driven body portion is so thick that it is hardly deformed at the time of key release, except at least the sensor portion and the projection portion.

In these keyboard devices, the sensor unit is a switch consisting of a movable contact and a fixed contact, a two-make touch response switch provided with two sets thereof, or an entire process using a reflecting surface and a photoreflector. Any sensor such as a sensor for sensing may be used. When using a switch, it is desirable to dispose the center position of the contact portion off the working axis of the actuator section. By doing so, deterioration of the contacts can be prevented.

In the keyboard device for an electronic musical instrument described above, a first actuator and a second actuator, which is farther from the fulcrum of the swing member than the first actuator, are provided as the actuator section, and the detecting means is provided. The touch response information may be obtained by the following configuration.

That is, the detecting section is a flexible elastic body comprising a base section and a bulging section having a driven body section provided with a first sensor section and a second sensor section below, and the flexible elastic body. There is a fixing portion for mounting the flexible elastic body, and the driven body portion has
A hinge portion connecting to the base portion is provided at an end portion of the swinging member far from the fulcrum portion, and an actuator receiving portion is provided on the upper surface.

The first sensor section is provided at a position closer to the hinge section than the second sensor section so that the distance between the first sensor section and the fixed section is smaller than the distance between the second sensor section and the fixed section. When the actuator receiving portion is pushed down by the actuator portion, the driven body portion rotates about the hinge portion as a fulcrum of rotation, so that the pressing force of the first actuator and the second actuator on the driven body portion is increased. The actuator section and the detection means are arranged such that the distribution is larger in the first actuator in the initial stage of the pressing stroke and larger in the second actuator in the latter stage of the pressing stroke.

With this configuration, the first actuator, which is closer to the fulcrum of the swinging member, is the hinge portion of the actuator receiving portion of the driven body portion at the beginning of the pressing stroke when the key is depressed. The first sensor portion closer to the hinge portion is actuated at a relatively faster speed with a predetermined stroke by pressing and driving the portion farther from. After that, the second one that is farther from the fulcrum of the swinging member
The actuator pushes the portion of the driven body portion closer to the hinge portion of the actuator receiving portion at a lower descending speed than the first actuator, so that the second driving sensor which is far from the hinge portion is driven mainly by the pushing driving force. 1
Operate at the same speed as the sensor of.

Therefore, chattering is less likely to occur even if these sensors are switches having movable contacts and fixed contacts, and it is possible to always obtain touch response information that faithfully reflects the operation state of the key.

In the keyboard device of the electronic musical instrument described above, the rocking member is used as a key, and an actuator section having a rotation fulcrum for driving the detecting means while rotating with the key when rocking the key is provided. in the lower surface of the driven body and the protrusion may be provided at a position farther from the sensor unit with respect to the rotation fulcrum of and the actuator opposite the actuator receiving portion. With this configuration, when the actuator receiving portion is pressed by the actuator portion,
It is the same as in the above-mentioned case that, after the driven body part is rotated and the sensor part is operated, the protrusion comes into contact with the fixed part and is elastically deformed. However, at this time, as the protrusion is farther from the rotation fulcrum portion of the actuator, the elastic repulsive force by the flexible elastic body including the protrusion and the driven body portion acts more in the returning direction of the actuator. , The degree of speeding up the return when the key is returned increases. At the same time, the durability of the protrusion and the contact portion with the protrusion is increased. Other functions and effects are similar to those described above.

Further, like the keyboard device of an electronic musical instrument shown as a conventional example in FIGS. 14 and 15, the detecting means mounts a driven part having a base part and one or more movable contacts, and a base part. A keyboard device that includes a fixed portion that has a fixed contact that is fixedly placed and that faces the movable contact, and that the driven body portion is rotatable about one end as a rotation fulcrum, and an actuator receiving portion is provided on the upper surface of the keyboard device. Also provided is one in which a protrusion is provided on a lower surface of the driven body portion so as to face the actuator receiving portion.

With this configuration, after the movable contact comes into contact with the fixed portion to turn on the fixed contact when the key is pressed,
Even if an overstroke occurs due to the further pressing of the key, the projection of the driven body part contacts the fixed part, preventing the lower surface of the driven body part from directly colliding with the fixed part, and the reaction force from the fixed part. It is possible to prevent the driven body portion from being deformed by the (drag force), mechanical noise due to impact, or damage to the fixed portion such as the substrate.

In the above-mentioned keyboard device, the projection is provided on the lower surface of the driven body portion of the detecting means, but instead of this, the projection is provided on the fixed portion at a position facing the actuator receiving portion. May be. Even in this case, the same action and effect as those described above can be obtained by the protrusion.

If the protrusion is formed of an elastically deformable member, the shock absorbing action at the time of overstroke is enhanced, the deformation of the driven body can be more effectively prevented, and the protrusion is elastically accumulated. The elastic energy can also accelerate the return of the rocking member such as the key when returning.

Further, when the driven body is pushed down by the actuator portion to rotate the protrusion and the inner dome type movable contact comes into contact with the fixed contact, the protrusion is provided on the line of action of the driving force of the actuator portion. Good. As a result, almost all the driving force of the actuator portion at the time of overstroke can be absorbed by the protrusions, so that the deformation and deterioration of the driven body portion can be more effectively prevented.

The projection is symmetrical with respect to the line of action of the driving force of the actuator after the driven body is pushed down by the actuator to rotate and the movable contact of the inner dome type contacts the fixed contact. A plurality may be provided at different positions. As a result, the driving force of the actuator portion at the time of overstroke can be evenly absorbed by the plurality of protrusions, so that the deformation and deterioration of the driven body portion can be effectively prevented.

[0031]

DETAILED DESCRIPTION OF THE INVENTION

[First Embodiment] FIG. 1 is a perspective view of a keyboard device showing a first embodiment of the present invention, and FIG. 2 is a side sectional view of the keyboard device, taken along line AA of FIG. It is a partial view of the front of the keyboard when cut and viewed in the direction of the arrow, and the mass body and the switch part are shown in a side view. This keyboard device is used for an electronic musical instrument, and a sound source section (not shown) is placed behind a shelf plate (bottom plate) 52 of the musical instrument body, and the keyboard device is arranged in front (in front).

The keyboard device generally includes a chassis 10 as a support member and a key support portion 12 of the chassis 10.
The required number of white keys and black keys 20 rotatably supported by the fulcrum portion 21 and the mass body support portion 15 of the chassis 10 located below the respective keys 20. The hammer 30 is a freely arranged mass body. This key 2
0 and the hammer 30 are swing members.

More specifically, the key 20 and the hammer 30 are urged by a fork-type biasing member (spring) 41 having their ends abutted in the vicinity of 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 this spring 41, but the clockwise force in FIG. 1 due to the turning force due to the weight of the hammer 30 and the urethane rubber 2 which is a cushioning member due to the force transmitting portions 31b and 31c.
4 is transmitted to the hammer driving unit 23 of the key 20 via the control unit 4 (see FIG. 2) to prompt the return of the key. In other words, this spring 41 moves from the chassis 10 to the key 20 and the hammer 3
This is to prevent 0 from dropping out.

Further, the force transmitting portions 31b, 31 of the hammer 30
A key switch drive section 31d integrally formed with a first actuator section a1 and a second actuator section a2 is provided near the hammer-side fulcrum section 31a in the vicinity of c, and the key depression operation is performed by each of the actuator sections a1 and a2. The flexible elastic body (movable part) M shown in FIG. 2 of the key switch SW, which is a detection means for detecting the, is pressed. The key switch SW
Is disposed in the through hole 14 formed in the key switch mounting portion 19 on the front side of the chassis 10, the details of which will be described later.

In FIG. 1, reference numeral 43 denotes the chassis 10.
A stopper provided at the front of the vehicle for over-depressing an infant or the like, 42 is a white key guide, and 16 is a chassis rear portion 17
Is a reinforcing rib wall which connects the chassis horizontal part 11 with a key guide 44 for a black key, and 46 is a stopper for a key and a hammer for keeping a non-pressed state.

A side sectional view of the key switch SW is shown in FIG. 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 substrate 50 that is a fixed portion and a flexible elastic body M that is positioned and mounted on the upper surface of the substrate 50.

The flexible elastic body M comprises a base portion bs fixed on the substrate 50 and a bulging portion sa, and the bulging portion s.
a is an outer dome-shaped flexible body in which one end is connected to the driven body portion sd rotatably connected to the base portion bs via the hinge portion hg and the periphery including the other end portion except the hinge portion hg. The skirt portion sk and the skirt portion sk are integrally formed of rubber resin.

The key switch SW is a contact time difference type two-make touch response switch, and two sets of fixed contacts f1 and f2 having a comb-shaped fixed contact pattern are provided on the upper surface of the substrate 50 which is a fixed portion. Has been formed. The driven body portion s is arranged so as to face the fixed contacts f1 and f2.
On the lower surface of the inner dome-shaped first sensor portion se1 and the second sensor portion se2 which are formed so as to respectively project downward from the lower surface of the movable contact as1,
as2 is provided.

The first and second sensor parts s of the driven body part sd
The movable contacts as1 and as2 are thin-walled parts t1 and t2 that act as shock absorbers after the movable contacts as1 and as2 contact the fixed contacts f1 and f2, and the movable contacts as1 and as2.
Is composed of movable concave portions h1 and h2. And this cover
A protrusion p having elasticity for speeding up the return of the rocking member, which is the key 20 and the hammer 30, is integrally formed at a position facing the actuator receiving portion ac2 on the lower surface of the driving body portion sd , and the upper surface side is the first side. , Second actuator receiving part ac
1 and ac2.

By the rotation of the hammer 30 when the key is depressed, the first actuator portion a1 pushes down the first actuator receiving portion ac1 and the second actuator portion a2 pushes down the second actuator receiving portion ac2. Here, the positional relationship between the first actuator portion a1 and the second actuator portion a2 of the hammer 30, the movable contacts as1 and as2 and the fixed contacts f1 and f2 of the switch SW, and the protrusion p is as shown in FIG. The 1st actuator part a1 and the 2nd movable contact as2, and the 2nd actuator part a2 and the 1st movable contact as1 are arrange | positioned, and are arrange | positioned.

The second actuator portion a2 and the projection p are arranged so as to substantially coincide with each other on the vertical axis v passing through the projection p when the push-cut is performed. The first actuator portion a1
And the second movable contact as2 may be deviated from the second movable contact as2 or may be arranged on the same vertical axis, the operation does not change so much. With such an arrangement, when the first actuator receiving portion ac1 is pressed by the first actuator portion a1, the hinge portion hg
The driven body part sd rotates about the fulcrum. Hinge hg
Is formed on the upper end surface k of the concave portion provided by being cut out from the upper surface of the base portion bs to the outside slightly above the rising surface u1 of the driven body portion sd.

Therefore, the rising surface u1 and the end surface k are displaced from each other with respect to the vertical axis. This allows
The hinge portion hg makes it easier to rotate the driven body portion sd after the protrusion p contacts the contact portion e of the substrate 50. At the same time as the driven body portion sd rotates, the skirt portion sk spreads outward in the horizontal direction, 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 deformed, and then the second fixed contact f2
The movable contact as2 of the above contacts. At this time, the projection p is made to abut on the abutment portion e of the substrate 50 at the same time or slightly separated.

Then, in the case of a configuration in which they are slightly separated,
After that, the thin portion t2 of the second sensor portion se2 is deformed,
Then, the protrusion p comes into contact with the contact portion e of the substrate 50. At the same timing as or slightly later than this timing, the rear portion 32 of the mass concentration portion 31 on the side opposite to the force transmission portion of the hammer 30 shown in FIG. 1 hits the thick hammer stopper (felt material) 47 fixed to the chassis 10. Hammer 30 and key 20 in contact
Stop. When the key is normally pressed (mp to f), the protrusion p
Is slightly bent, but the harder the key is,
The amount of bending of the protrusion p also increases.

The elastic deformation action of the flexible elastic body M will be described in more detail. In the driven body portion sd, the first and second actuator receiving portions ac1 and ac2 are the first and second actuator portions a1 and a2. When pressed with, the protrusion p is compressed and deformed by the displacement after the switch SW is turned on.

The operation of the switch when the key is released is just opposite to that when the key is pressed. The force of the substrate 50 immediately after the key is released to press the protrusion p increases as the force of the key is increased. Therefore, not only the switch returns better, but also the hammer 30 and the key 20 which are swinging members return. Get better. Good return also reduces the incidence of chattering in a chain. That is, touch response with few malfunctions
A switch can be realized.

Further, according to this embodiment, as can be seen from FIG. 2, the key switch driving unit 31d is provided with the first actuator.
The data portion a1 is closer to the support portion (fulcrum portion) 15 of the hammer 30 which is the swing member, and the second actuator
The portion a2 is arranged so that its distance becomes longer.

As can be seen from FIGS. 2 and 3, the flexible elastic body M of the key switch SW is the driven body portion s.
The first sensor portion se1 provided on the driven body portion sd is arranged so that the hinge portion hg side connecting one end of d to the base portion is far from the support portion of the hammer 30, and the second sensor portion se2 is larger than the second sensor portion se2. At a position close to the hinge portion hg, the distance between the second sensor portion se2 and the substrate 50, which is the fixed portion, is small.
It is provided so as to be smaller than the interval between and.

Therefore, the actuator receiving portions ac1 and ac2 of the driven body portion sd are connected to the key switch driving portion 31d.
When pressed by the actuator parts a1 and a2, the driven body part sd rotates about the hinge hg as a fulcrum of rotation. At that time, the driven body part sd is pushed by the first actuator part and the second actuator part with respect to the driven body part sd. The key switch driving unit 3 is configured so that the pressure distribution is larger in the first actuator portion a1 at the beginning of the pressing stroke and larger in the second actuator portion a2 at the latter stage of the pressing stroke.
1d and a key switch SW are arranged.

Therefore, at the beginning of the pressing stroke at the time of key pressing, the first actuator portion a1 which is closer to the supporting portion 15 of the hammer 30 is mainly driven by the driven body portion s.
By pressing and driving the first actuator receiving portion ac1 that is farther from the hinge portion hg of d, the first sensor portion se1 that is closer to the hinge portion hg is operated at a relatively faster speed with a predetermined stroke.

After that, the second actuator portion a2, which is farther from the support portion 15 of the hammer 30, has a lower descending speed than the first actuator receiving portion ac1 and is closer to the hinge portion of the driven body portion sd. By driving the receiving portion ac2 by pushing, mainly by the pushing driving force, the second sensor portion se located farther from the hinge portion hg is pressed.
2 is operated at the same speed as the first sensor unit se1.

Therefore, since the switches formed by the movable contact and the fixed contact of each of the sensor units se1 and se2 are turned on relatively quickly at the same speed, chattering is less likely to occur and the key operation state is always faithfully reflected. It becomes possible to obtain touch response information. In addition, the first actuator receiving portion ac1 and the second actuator receiving portion ac2 are connected to each other during the entire stroke when one key is pressed.
Since the integrated values of the forces pressed and received by the first or second actuator portion a1 become substantially equal, the driven body portion s
A part of d does not wear quickly and the durability is improved.

Further, in this embodiment, since the projection p is integrally formed on the driven body portion sd together with the sensor portions se1 and se2 which are the movable portions of the key switch,
Not only is the key switch made easy and inexpensive, but also a uniform return feeling is obtained for each key 20, and the key return condition does not differ only for a specific key.

However, it is possible to make the elastic force of the protrusion p different for the white and black keys and to make the key return state the same for the white and black keys. In addition, in this embodiment, the driven body part sd such as a key switch is operated by the hammer 30 which is interlocked with the depression of the key 20.
Although is pressed, the driven body portion sd may be directly pressed by the key 20.

That is, the fulcrum of the key (not shown) is provided on the right side of FIG. 3, and the actuator parts a1, a provided on the lower surface of the key.
2, the actuator receiving portions ac1, a of the driven body portion sd
The configuration may be such that c2 is pressed, and other configurations may be similar to those in FIG. In that case, the protrusion p is the driven body portion sd.
On the lower surface of the key on the vertical axis v that passes through the second actuator receiving portion ac2 and is substantially perpendicular to the substrate 50, and is provided at a position farther from the fulcrum portion of the key than the first and second sensor portions se1 and se2. .

In this case also, the actuator parts a1 and a2
When the actuator receiving parts ac1 and ac2 are pressed by the driven body part sd, the sensor parts se1 and se
It is the same as the above-mentioned case that the projection p comes into contact with the substrate 50 and elastically deforms after activating 2.

However, at this time, the further the protrusion p is from the fulcrum of the key, the greater the elastic repulsive force of the flexible elastic body M including the protrusion p and the driven member sd acts in the returning direction of the key 20. In the case of this configuration, the degree of speeding up the return when the key is returned increases. At the same time, the projection p and the projection p
The durability of the contact part with is also increased. Other functions and effects are similar to those described above.

[Second Embodiment] FIGS. 4 and 5 are side sectional views showing only a key switch portion which is a detecting means of a keyboard device according to a second embodiment of the present invention. The key switch portion when not pressed is shown, and FIG. 5 shows the same portion when pressed.

The feature of this embodiment is that the single actuator portion a pushes down the driven body portion sd2 of the flexible elastic body M2 of the key switch SW2 which is the detection means, and the pushed actuator receiving portion ac A projection p is formed on the lower surface of the driven body portion sd on the extension of the force transmission line (force acting line) v passing therethrough.
2 is projected. As a result, the driven body portion sd is prevented from being deformed when it is pressed down in FIG. This protrusion p
Since 2 is formed integrally with the flexible elastic body M2, it naturally has elasticity.

In the second embodiment, the first
The same parts as those of the above embodiment are designated by the same reference numerals, and the parts having the same functions but slightly modified are denoted by the same reference numeral followed by "2" and the description thereof is omitted.

According to this embodiment, when the actuator part a provided continuously to the key 20 or the hammer 30 as the swing member is pushed down the actuator receiving part ac on the upper surface of the driven body part sd2, the hinge part is formed. The driven body portion sd rotates about hg as a fulcrum, the skirt portion sk2 spreads outward in the horizontal direction, the movable contact as1 comes into contact with the fixed contact f1 (first switch-on), and then the fixed contact f2. The movable contact as2 comes into contact (the second switch is turned on).

At this time, the projection p is set to have a height such that it is brought into contact with the contact portion e formed on the upper surface of the substrate 50 slightly higher after the second switch is turned on or after a while. As a necessary condition, at the maximum deformation of the flexible elastic body M,
If the entire lower surface of the driven body portion sd is not in contact with the substrate 50, the height and size of the protrusion p may be set in any way.

As described above, also in this embodiment, since the protrusion p2 can accelerate the return of the switch when it is separated, chattering can be prevented, and the action of accelerating the return of the swing member such as the key and the hammer can be increased. Eggplant Further, it is possible to obtain an effect of preventing collision with the substrate 50 on the lower surface of the driven body portion sd2, suppressing occurrence of mechanical noise, and enhancing durability.

[Third, Fourth, and Fifth Embodiments] FIGS. 6, 7, and 8 are views showing the third, fourth, and fifth embodiments of the present invention, respectively. Similarly, a side cross-sectional view of only a peripheral portion of a key switch used in the keyboard device when not pressed is shown. In these figures, parts corresponding to those in FIG. 3 are designated by the same reference numerals.

FIG. 6 shows a third embodiment, in which two detection means, a switch s1 and a hinge hg connecting the base portion sb of the flexible elastic body M and the driven body portion sd, are used.
This is an example in which the protrusion p3 is provided at a position farther than s2. The configurations of the switches s1 and s2 are similar to those of the movable contacts of the sensor unit and the fixed contacts on the substrate of the above-described first and second embodiments, but the illustration is simplified.

FIG. 7 shows a fourth embodiment, in which two protrusions p41 and p42 are arranged at intervals between the two switches s1 and s2 on the lower surface of the driven body portion sd, and the two protrusions p41 and p42 are provided. An actuator receiving portion ac that is pressed by the actuator portion a is provided above the space between the protrusions.

The two protrusions p41 and p42 are rotated after the driven body portion sd is pushed down by the actuator portion a and the inner dome contact point (movable contact point) contacts the fixed contact point. It is preferable to provide them at positions symmetrical with respect to the line of action L of the driving force. It should be noted that three or more protrusions may be provided, and in that case as well, the distance from the action axis and the angular interval are set so that the protrusions are symmetrically arranged with respect to the action line L of the driving force of the actuator portion. It is good to arrange them equally. By providing a plurality of protrusions in this way, the actuator part a
Since the driving force due to the above can be evenly absorbed by the plurality of protrusions, it is possible to effectively prevent the deformation or deterioration of the driven body portion sd.

FIG. 8 shows a fifth embodiment. In the keyboard device of each of the above-mentioned embodiments, a protrusion is provided on the lower surface of the driven body portion of the detecting means, but instead of this, on the fixed portion 50. The protrusion p5 is provided at a position facing the actuator receiving portion ac of the driven body portion sd. Even in this case, the same action and effect as those of the above-described embodiments can be obtained by the projection p5.

The projection p5 in this embodiment is
The ridges may be uniformly long in the direction in which the keys or hammers that are rocking members are arranged (the direction perpendicular to the paper surface in the figure), or they may be scattered at the respective key switch positions in the same direction. Further, the shape of the protrusion in each of these embodiments may be any of a wedge shape, a semi-cylindrical shape, a hemispherical shape, a conical shape and the like in cross section.

Furthermore, the actuator portion a is not limited to the shape protruding from the swinging member as in the example shown in FIGS. 1 and 2, and may be flush with the lower surface of the swinging member.
The actuator receiving portion may be provided so as to project on the upper surface of the driven body portion sd, and the protruding actuator receiving portion may be pressed by the actuator surface portion of the swing member.

[Sixth Embodiment] Next, the sixth embodiment of the present invention will be described.
The embodiment will be described with reference to FIGS. 9 to 13. This embodiment is one in which the present invention is applied to a keyboard device having the same structure as the keyboard device of the conventional example shown in FIGS. 14 and 15, and corresponds to FIGS. 14 and 15 in FIGS. 9 to 13. The same reference numerals are given to the parts to be performed.

FIG. 9 is a side sectional view (note that the key is not shown in section) of the white key portion of the keyboard device for an electronic musical instrument according to the sixth embodiment. As shown in FIG. 10, the key switch SW of this keyboard device has a base portion 61 fixed on a substrate 50, which is a fixed portion, and one end thereof connected to the base portion 61 via a hinge portion 62. The driven body portion 63 having the inner dome type movable contact (sensor portion) 64 protruding to the inside is integrally formed by an elastic member such as a resin having a rubber property. A fixed contact 70 formed of a pair of conductive patterns is formed at a position facing the movable contact 64.

The driven body portion 63 is shown in FIG.
An elastic return force to the inclined position when the key is not pressed is given. An actuator receiving portion 63b is provided on the upper surface of the driven body portion 63, and a protrusion 65 is provided on the lower surface 63a at a position facing the actuator receiving portion 63b.

As shown in FIG. 9, a key 20 is provided above the key switch SW so as to be swingable around a fulcrum portion 21 provided on a frame which is a support member (not shown), and is provided on the lower surface thereof. The provided actuator portion 20a is brought into contact with the actuator receiving portion 63b of the driven body portion 63, as indicated by a phantom line in FIG. In FIG. 9, the non-depressed position of the key 20 is shown by a virtual line, and the depressed position is shown by a solid line.
Although this figure shows an example of a white key, the black key is similar except that the key length is short and the height is high.

The key 20 is depressed, and the position of its tip is shown in FIG.
When the key stroke from a to b shown in is displaced,
By the actuator section 20a provided on the key 20,
The actuator receiving portion 63b of the driven body portion 63 of the key switch SW is pressed and driven, and the driven body portion 63 is moved to the hinge portion 62.
With the fulcrum as a fulcrum, the vehicle turns right in the figure, and the state shown in FIGS.

At this time, the inner dome type movable contact 64 provided on the driven body portion 63 abuts on the substrate 50 to turn on the pair of fixed contacts 70 formed therein, thereby pushing The key is detected. At the same time as or immediately after that, the tips of the protrusions 65 contact the substrate 50. In this state, a clearance D is secured between the upper surface of the substrate 50 and the lower surface 63a of the driven body portion 63.

After that, the key 20 is further pressed, and the tip of the key 20 overstrokes to the position c shown in FIG.
Then, the driven portion 63 is further pressed and driven by the actuator portion 20a to be in the state shown in FIG. 12, but at that time, the projection 65 is elastically deformed to absorb the pressing force, and the driven portion 63 is driven. The lower surface 63a of the above does not collide with the substrate 50. Therefore, mechanical noise due to impact is hardly generated, and the durability of the key switch is improved.

At the time of releasing the key, the elastic energy due to the elastic deformation of the inner dome type movable contact 64 and the elastic energy due to the elastic deformation of the protrusion 65 are transferred to the actuator section 20.
Since a is released in the direction of pushing up, it is possible to accelerate the return of the key 20 to the non-depressed position shown by the phantom line in FIG.

Further, as shown in FIG. 13, the driven body portion 6
If the projection 65 of No. 3 is provided on the line of action L of the driving force of the actuator portion 20a after the inner dome-type movable contact contacts the fixed contact 70, the driving force Fa by the actuator portion 20a at the time of overstroke is provided. , The projection 65 receives the reaction force −Fa from the substrate 50, but since no bending moment is generated with respect to the driven body portion 63, the driven body portion 63 is not bent and deformed, and the key switch SW The operation is reliable and the durability is significantly improved.

The shape of the protrusion 65 in this embodiment is also
Any of a wedge type, a semi-cylindrical type, a hemispherical type, a conical type and the like may be used. Further, a plurality of the protrusions 65 may be provided at positions symmetrical with respect to the line of action L of the driving force of the actuator portion 20a shown in FIG. Further, the protrusion 65 and the actuator receiving portion 63b may be provided at a position closer to the hinge portion 62 than the inner dome type movable contact 64 of the driven body portion 63. Furthermore, in this embodiment, an example in which an inner dome-type movable contact is provided on the driven body portion as the movable contact has been described, but the invention is not limited to this, and for example, a convex portion is simply formed on the lower surface of the driven body portion. Alternatively, a columnar or cylindrical protrusion may be provided, and a movable contact made of a conductive member such as conductive rubber may be provided on the lower surface thereof.

In each of the above-described embodiments, the swing member is either a hammer or a key. However, the swing member may be changed to the other, or a jack member used in a piano or the like. It may be the second swing member. Further, as a detecting means for detecting the swinging movement of the swinging member, an optical anti-slope is provided on the lower surface of the driven body portion, and an incident light amount detector including a photo reflector is provided on the corresponding substrate. A detector may be provided. The elastic strength of each part of the movable part is preferably in the following order (larger order). 1: Driven body part, 2: Protrusion, 3: Hinge part, skirt part, thin part, etc.

[0081]

As described above, according to the present invention, quick return of rocking members such as keys and hammers at the time of key release in a keyboard device of an electronic musical instrument can be performed to enable quick passage performance. it can. In addition, the touch response information can always be obtained accurately. Further, it is possible to enhance the durability of the detection means for detecting the swinging motion of the swinging member and prevent the generation and deterioration of noise.

[Brief description of drawings]

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

FIG. 2 is a side sectional view of a main part taken along the line AA of FIG.

FIG. 3 is a side sectional view showing only a key switch portion of the keyboard device.

FIG. 4 is a side sectional view showing only a key switch portion used in the keyboard device of the second embodiment of the present invention during a non-pressing operation.

FIG. 5 is a side sectional view of the same when the pressing operation is performed.

FIG. 6 is a side sectional view showing only a key switch portion used in a keyboard device of a third embodiment of the present invention when not pressed.

FIG. 7 is a side cross-sectional view showing only a key switch portion used in a keyboard device of a fourth embodiment of the present invention when not pressed.

FIG. 8 is a side cross-sectional view showing only a key switch portion used in a keyboard device of a fifth embodiment of the present invention when not pressed.

FIG. 9 is a side sectional view of a white key portion of a keyboard device according to a sixth embodiment of the present invention (however, the key is not sectioned).

10 is a side sectional view showing only the key switch portion shown in FIG. 9 when no key is pressed.

FIG. 11 is a side sectional view of the same when the key is pressed.

FIG. 12 is a side sectional view of the same at the time of overstroke.

FIG. 13 is a side sectional view at the time of key depression for explaining the optimum position for providing the protrusion.

FIG. 14 is a side sectional view of a white key portion when a key is not pressed (however, the key is not sectioned) showing an example of a keyboard device of a conventional electronic musical instrument.

FIG. 15 is a side sectional view of the same when the key is pressed.

[Explanation of symbols]

10 ... Chassis (support member), 15 ... Hammer support part,
20 ... Key (rocking member), 21 ... Key fulcrum part, 30 ... Hammer (mass body: rocking member), 31d ... Key switch driving part,
50 ... Substrate (fixed part) SW, SW2 ... Key switch (rocking motion detection means), a1 ... First actuator part, a2 ...
2nd actuator part, bs, bs2 ... base part, s
a, sa2 ... bulging portion, M, M2 ... flexible elastic body, hg ...
Hinge part, sd, sd2 ... Driven body part, sk, sk2 ...
Skirt part, se1 ... 1st sensor part, se2 ... 2nd sensor part, ac1 ... 1st actuator receiving part, ac2 ...
... second actuator receiving part, v ... vertical axis, p, p
2, p3, p41, p42, p5 ... Protrusions, as1, as
2 ... movable contact, f1, f2 ... fixed contact, 20a ... actuator part, 61 ... base part, 62 ... hinge part, 63 ...
Driven body part, 63b ... Actuator receiving part, 64 ... Inner dome type movable contact, 65 ... Protrusion, 70 ... Fixed contact, L ...
Line of action of driving force of actuator

Claims (6)

(57) [Claims] 1. A swinging member that is swingably supported by a support member, a detection unit that detects a swinging motion of the swinging member when the swinging member is pressed, and a swinging member when the swinging member swings. A keyboard device for an electronic musical instrument, comprising: an actuator unit that drives the detection unit in cooperation with the detection unit, wherein the detection unit includes a fixing unit that mounts and fixes the base unit, the hinge unit, the driven body unit, and the base unit. The driven body portion has one end rotatably connected to the base portion via the hinge portion, the actuator receiving portion is provided on the upper surface, and the sensor portion protruding downward from the lower surface is provided. A protrusion having elasticity is provided at a position facing the actuator receiving portion on either the lower surface of the driven body portion or the fixed portion, and when the actuator receiving portion is pressed by the actuator portion, the driven portion is driven. An electronic device, characterized in that the body part is rotated about the hinge part as a fulcrum, and the protrusion is elastically deformed after the sensor part of the driven body part contacts the fixed part. Instrument keyboard device. 2. A swinging portion swingably supported by a supporting member.
Wood and Fixed to the support member or mounted in a fixed relationship thereto,
A detection hand that detects the swing motion of the swing member when the swing member is pressed.
Dan, When the swing member swings, the detection is performed by cooperating with the swing member.
Of an electronic musical instrument provided with an actuator unit for driving the means.
In the keyboard device, The detection means is a baseDepartment andA bulging part having a driven body part
And a flexible elastic body, and placing the flexible elastic body
Has a fixed part The driven body partIs,one endToHinge partThrough the base
Rotatably connected to theInstall the actuator receiving part on the top
Along withInstall the sensor part that projects downward from the bottom surface.
Ke Either the lower surface of the driven body portion or the fixed portion
Having elasticity at a position facing the actuator receiving portion
Provide a protrusion , The actuator receiving portion is
When it is pressed down, the driven body part pivotally supports the hinge part.
Pivot as a pointThen, the sensor part of the driven body partThe above
After contacting the fixed partThe protrusion isElastically deforms
When the rocking member returns due to elastic energy during shaping
Of an electronic musical instrument characterized by accelerating the return of
Keyboard device. 3. A key swingably supported by a support member via a fulcrum portion, and a key fixed to or fixed to the support member,
A keyboard of an electronic musical instrument including a detection unit that detects a swinging motion of the key when the key is pressed, and an actuator unit having a rotation fulcrum that drives the detection unit while rotating with the key when swinging the key. In the device, the detection means includes a flexible elastic body including a base portion and a bulge portion having a driven body portion, and a fixing portion on which the flexible elastic body is mounted. parts are at one end through a hinge portion and the base
Rotatably connected to the upper part, the actuator receiving part is provided on the upper surface, and the sensor part protruding downward from the lower surface is installed.
On the lower surface , facing the actuator receiving part
Further , a protrusion having elasticity is provided at a position farther from the sensor portion with respect to the rotation fulcrum portion of the actuator portion, and when the actuator receiving portion is pushed down by the actuator portion, the driven body portion causes the hinge portion to move. It rotates as a rotation fulcrum , and the sensor section of the driven body section is
A keyboard device for an electronic musical instrument, wherein the projection is elastically deformed after abutting against the fixed portion, and the elastic energy at the elastic deformation accelerates the return of the key at the time of return. 4. The keyboard device for an electronic musical instrument according to claim 1, wherein the sensor portion projects downward from a lower surface of the driven body portion.
A keyboard device for an electronic musical instrument, comprising: a fixed contact that faces the inner dome-shaped movable contact on the fixed portion. 5. The protrusion is provided on a line of action of a driving force of the actuator portion after the driven body portion is pressed down by the actuator portion to rotate and the movable contact comes into contact with the fixed contact. The keyboard device for an electronic musical instrument according to claim 4, which is provided. 6. The actuation line of the driving force of the actuator unit after the movable contact unit comes into contact with the fixed contact unit when the driven unit unit is pressed down by the actuator unit to rotate the protrusion. The keyboard device for an electronic musical instrument according to claim 4 , wherein a plurality of keyboard devices are provided at symmetrical positions.