JP3402183B2 - Drive unit structure of 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 drive unit structure of a keyboard device including a driving body (actuator) and a driven body.

[0002]

2. Description of the Related Art Conventionally, a keyboard device is provided with various kinds of driving portions each including a driving body (actuator) and a driven body driven by the actuator. For example, in an electronic keyboard instrument, a key switch unit capable of detecting a key and its key-pressing action is provided, and a drive unit structure configured to drive the key switch unit directly or indirectly by the key-pressing action is provided. Things are generally known. In this case, if the key and the key switch unit are regarded as one drive unit, the key is the actuator and the key switch unit is the driven body.

Among such electronic keyboard musical instruments, there is known one that electrically reproduces the sound of an acoustic musical instrument such as a grand piano or a pipe organ based on the key pressing operation detected by the key switch section. Many of them have been designed so that the touch is similar to that of a real key press. For example, by using a mass member to give an appropriate inertia to the key pressing action,
A keyboard musical instrument is known that is designed to have a key-pressing feel like a grand piano.

FIG. 12 is a diagram showing a key depression resistance in an electronic keyboard instrument having a conventional keyboard device drive unit structure using a mass member. In the figure, the horizontal axis represents the key position ST ″ in the key pressing stroke, and the vertical axis represents the load (key pressing resistance FK ″) transmitted to the finger through the key. ST0 "on the horizontal axis is the key pressing start position (the key pressing upper limit position and the key non-key pressing position)
ST1 "is a key (actuator part (not shown))
Shows the key position at the time when the key touches the switch. S
TF "represents a full stroke (key lower limit position). In this electronic keyboard instrument, between key positions ST0" and ST1 ",
By using the mass member, the characteristic of the key depression resistance FK ″ is similar to that of the key depression resistance (especially the going stroke) in a general grand piano, and it is possible to obtain a key depression feeling that is close to a real thing.

[0005]

However, it is difficult to completely reproduce the feeling of key depression of a real acoustic musical instrument. For example, in the case of a grand piano, in the key stroke, the key depression resistance changes in a generally upward direction while changing intricately due to the rotation of the jack and the generation of frictional force between the jack and the roller pad. Ascends near the lower limit position. The characteristics of such a change in the key-depression resistance vary depending on the type of musical instrument, but it is not realistic to configure the part related to the key-depression just like the real thing in order to reproduce the feeling of key-depression.

Generally, an electronic keyboard instrument is provided with the above-mentioned key switch section, but this key switch section is usually made of a flexible member such as rubber, and its material characteristics affect the key depression resistance.

FIG. 13 is a cross-sectional view showing a part of the structure of the drive section of the conventional keyboard device having the switch section composed of this flexible member. The figure (a) shows the beginning of the key depression process,
FIG. 11B shows the end of the key depression stroke.

The switch portion 103, which is a driven body, is formed of an elastic body made of a flexible resin, and its bulging portion 103a is configured to be rotatable about a rotation fulcrum P3 '. The actuator 102 is, for example, a key that is driven by a key pressing operation (or is driven via the key), and is configured to be rotatable about a rotation fulcrum P2 ′. The actuator 102 comes into contact with the bulging portion 103a of the switch portion 103 at the contact point Q'and switches 103
To drive. Distance L between rotation fulcrum P2 'and contact point Q'
1 ', the distance L2' between the rotation fulcrum P3 'and the contact point Q'
Both have almost no change from the beginning of the key depression process ((a) in the same figure) to the final stage ((b) in the same figure).

When the switch portion 103 is driven, the skirt portion 103a of the bulging portion 103a bends (bulging portion 1).
03a is buckled), each movable contact SW 'is fixed contact F
The key pressing operation is detected by abutting on S '. At this time, a reaction force is generated as the bulging portion 103a bends, while the distances L1 ′ and L2 ′ are substantially constant as described above, so that the characteristic of the change in the key pressing resistance FK ″ is the bulging portion 10a.
It depends on the reaction force of 3a. As a result, as shown in FIG. 12, the key depression resistance FK ″ once rises after passing the key position ST1 ″ and then decreases immediately before reaching the key position STF ″ (Z in the same figure).
Part), it reaches the key position STF ″ as it is and rises rapidly. That is, when the key pressing resistance FK ″ is low, a lower limit stopper (not shown) for restricting the key pressing lower limit position. Since the key comes into contact with, the vibration at that time is transmitted to the finger via the drive unit. The key-pressing feeling based on the characteristics of such key-pressing resistance is different from the original good key-pressing feeling (feeling of sticking) of the grand piano, and the player feels that the aftertouch is particularly bad (pull-pull feeling). ).

As described above, in the electronic keyboard musical instrument, the touch feeling is
In particular, since the aftertouch feel is usually dependent on the member characteristics (buckling strength, reaction force, etc.) of the switch section, it was not easy to reproduce the realistic keystroke feeling of an acoustic musical instrument. The feeling of key depression is the key depression resistance in the key depression stroke,
That is, although it depends on the characteristic of the change in the drive resistance applied to the key, it may be convenient for the other drive units to be able to freely set the characteristic of the change in the drive resistance.

The present invention has been made to solve the above-mentioned problems of the prior art, and its object is to provide a simple structure.
It is an object of the present invention to provide a drive unit structure of a keyboard device in which the characteristics of changes in drive resistance can be set arbitrarily.

[0012]

In order to achieve the above object, a drive unit structure of a keyboard device according to claim 1 of the present invention comprises a driven body rotatable about a first rotation fulcrum, and a second driven body. An actuator that is rotatable about a rotation fulcrum and is capable of rotating the driven body by contacting the driven body, and a surface of the driven body that contacts the actuator and the actuator. One of the surfaces contacting the driven body is formed into a convex curved surface, and the curvature of the other surface is set to a value smaller than the minimum curvature of the one surface .
The amount of movement at the contact point where the motor and the driven body come into contact with each other
For the distance from the first rotation fulcrum to the second rotation fulcrum
And the front side so that at least 10% or more
Note that each curvature of the other surface is set .

With this structure, the actuator comes into contact with the driven body to drive the driven body. At that time, one of the surface of the driven body that contacts the actuator and the one surface of the actuator that contacts the driven body is formed into a convex curved surface,
And since the curvature of the other surface is made smaller than the minimum curvature of the one surface, the position of the point where the one surface and the other surface come into contact with each other can change in the rotation process of the driven body. It is possible to change the rotational moment that the driving body should generate in order to drive the driven body.

If the respective curvatures of the two surfaces are variably set while satisfying the above conditions, the manner of changing the rotational moment can be set arbitrarily. Therefore, the characteristic of the change in the drive resistance can be arbitrarily set with a simple configuration. For example, if the drive unit structure is applied to the part related to the key pressing operation, it is possible to simulate the key pressing feeling of various keyboard musical instruments such as a grand piano and a pipe organ. Can be improved.

Further, the as with the previous SL actuator and the driven body is 10% or more with respect to the distance from the contact point movement amount of the first rotation supporting point of abutting to said second rotation support each curvature setting of one surface and the other surface
Therefore, the driving body must be generated to drive the driven body.
The rotation moment is sufficiently changed with the rotation of the driven body.
It is possible to obtain a sufficient change in drive resistance.
Wear.

[0016]

Further, it is desirable that the other surface is formed in a flat shape ( claim 2 ).

With this configuration, the characteristic of the change in the drive resistance can be made linear with respect to the rotation stroke of the driven body.
For example, if the drive unit is applied to the portion related to the key pressing operation and the key pressing detection, it becomes easy to freely set the feeling of key pressing.

Further, a key and a switch board are provided so that the actuator is rotated by a key pressing operation, and the driven body is provided with a key switch for contacting the switch board to detect the key pressing operation. May be used ( claim 3 ).

With this configuration, the characteristic of the change in the key-depression resistance can be arbitrarily set during the rotation process of the driven body, and the key-depression feeling can be freely set. Further, even when a plurality of key switches are provided to detect the key velocity, the feeling of key depression is improved due to the improvement in the detection accuracy of the key velocity.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

(First Embodiment) FIG. 1 is a perspective view showing the structure of a drive unit structure of a keyboard device according to a first embodiment of the present invention. The drive unit structure of the present embodiment is key 1
(White key), a hammer 2 (actuator) for giving an appropriate inertia to a key pressing operation to obtain a key pressing feeling like an acoustic piano, a switch section 3 (driven body) for detecting a key pressing operation, and It is mainly composed of a drive unit including a support member 9 and a chassis 4 that supports the entire drive unit. The black key has the same structure as the key 1, and the chassis 4
It is rotatably supported by.

As will be described later in detail, the key 1, the hammer 2,
The switch unit 3 has respective rotation shafts, that is, a key rotation shaft P1, a hammer rotation shaft P2 (second rotation fulcrum), and a switch rotation shaft P3 (first rotation fulcrum) (see also FIG. 2). It is configured so as to be vertically rotatable about the center. The key 1 is configured to be able to drive the hammer 2, and the hammer 2 is configured to be able to drive the switch unit 3.

When the key 1 is rotated by the key pressing operation, the hammer 2
And the switch part 3 rotates. At that time, key 1 and hammer 2
In relation to the key 1, it can be said that the key 1 is an actuator (driving body) and the hammer 2 is a driven body, and in the relation between the hammer 2 and the switch section 3, the hammer 2 is an actuator and the switch section 3 is a driven body.

2 and 3 are side sectional views taken along the line II-II in FIG. 2 shows a non-key-depressed state (state in which the key 1 is at the upper limit position of the key-depression stroke), and FIG. 3 shows a state of key depression (state in which the key 1 is at the lower-limit position of the key-depression stroke).

The key 1 has a convex spherical key fulcrum portion 1a provided on the rear end surface thereof. On the other hand, a key support portion 5 is provided at the rear of the chassis horizontal portion 4a of the chassis 4. A recess 5a is provided in a portion of the key support portion 5 that faces the key fulcrum portion 1a, corresponding to each key fulcrum portion 1a (FIG. 1).
The key fulcrum portion 1a engages with the concave portion 5a of the key support portion 5, and the key 1
Is vertically rotatable about the key fulcrum portion 1a (key rotation axis P1).

At the front of the key 1, there is provided a hammer driving portion 1b which hangs downward. A cushioning material 13 made of urethane rubber or the like is attached to the lower end of the hammer driving portion 1b. The cushioning material 13 is sandwiched between the upper extending portion 2c and the lower extending portion 2b of the hammer 2, and transmits the key pressing operation of the key 1 to the hammer 2 and the returning operation of the hammer 2 to the key 1. To do.

In the process of key depression and key depression recovery,
The upper end portion of the cushioning member 13 is always in contact with the upper extending portion 2c of the hammer 2 to ensure the transmission of the operation.

The chassis 4 is reinforced by connecting the chassis horizontal portion 4a and the front portion 4b of the chassis 4 by ribs 12. A key guide 6 for restricting rotation of the keys 1 in the arrangement direction is provided on the front portion 4b of the chassis so as to project for each key 1. Below the rear part of the chassis 4, there is a chassis holding part 4c.
Is provided. The chassis holding portion 4c is the chassis 4
And holds the hammer 2 so as to prevent the hammer 2 from falling off after the hammer 2 is mounted on the chassis 4.

A hammer 2 is provided corresponding to each key 1,
Hammer support portion 9a of the support member 9 provided on the chassis 4
It is supported by a hammer fulcrum portion 2a so as to be vertically rotatable about a (hammer pivot axis P2; a pivot point). A fork-shaped spring 7 is suspended from the vicinity of the hammer fulcrum 2a to the rear of the key 1. The spring 7 presses the key 1 against the key supporting portion 5 and the hammer 2 against the hammer supporting portion 9a of the supporting member 9 so as to press the key 1 and the hammer 2 together.
Does not easily fall off the chassis 4.

The hammer 2 always urges the key 1 upward by the lower extension 2b by the weight of the mass member 2f. As described above, the return force of the key 1 is not given by the spring 7, but is the return force of the hammer 2.
The hammer 2 has a switch driving unit 2e for driving the switch unit 3 at the bottom. The cross-sectional shape of the switch driver 2e will be described later.

An upper stopper 10 and a lower stopper 11 such as felt are provided on the rear portion of the chassis horizontal portion 4a of the chassis 4 and the chassis holding portion 4c, respectively.
The upper stopper 10 contacts the mass member 2f of the hammer 2 to restrict the lower limit position of the key 1 when the key is pressed, and the lower stopper 11 contacts the mass member 2f of the hammer 2 to press the upper limit position of the key 1 when the key is not pressed. Regulate.

A switch substrate 8 is attached to the chassis front portion 4b, and the switch portion 3 is provided on the switch substrate 8. The switch portion 3 is provided for each hammer 2 so as to face the switch driving portion 2e of the hammer 2.

FIG. 4 is a sectional view taken along the line VV of FIG. 1 showing the detailed structure of the switch section 3.

The switch portion 3 is a contact time difference type two-make touch response switch made of rubber, and comprises a fixed portion FS and a movable portion MS. Fixed part FS
Is composed of fixed contacts F1 and F2 which are comb-shaped patterns provided on the upper surface of the switch substrate 8. The movable portion MS is composed of an elastic bulge portion 3a, a base 3b and a hinge portion 3c. The bulging portion 3a has movable contacts 3a2, 3 for the first and second makeups.
a3 (key switch) is provided to face the fixed contacts F1 and F2, respectively.

Due to its elasticity, the bulging portion 3a is vertically rotatable about the hinge portion 3c (switch rotation axis P3; rotation fulcrum). When the hammer 2 rotates in response to the key pressing operation, the switch driving portion 2e of the hammer 2 abuts and slides on the sliding contact surface 3a1 (the other surface) of the switch portion 3 to rotate the bulging portion 3a. When the bulging portion 3a rotates downward,
First, the movable contact 3a2 comes into contact with the fixed contact F1 and then the movable contact 3a3 comes into contact with the fixed contact F2, and the key-on and key velocity of the key 1 are detected. The keyboard device has a function of electrically reproducing and generating a musical sound of a grand piano or the like based on the detected key-on signal or the like (not shown).

The sliding contact surface 3a1 of the bulging portion 3a is formed in a flat shape, and the hinge portion 3c is present in the surface SF2 including the sliding contact surface 3a1. With such a setting, as in the case of the hammer 2, the switch rotation axis P3 is moved to the surface SF.
The shortest distance to 2 is 0. Therefore, when the key is pressed, the switch driving portion 2e of the hammer 2 and the sliding contact surface 3 of the switch portion 3
Friction is generated by sliding with a1, but theoretically,
It is avoided that the frictional force acts on the driven switch portion 3 as a rotational moment.

The switch driving portion 2e of the hammer 2 has a tip end surface 2e '(one surface) formed in a semi-cylindrical shape having a convex curved surface in cross section. Specifically, in the present embodiment, the radii of curvature of the tip surface 2e ′ and the radius of curvature of the sliding contact surface 3a1 are RH and R, respectively.
Expressing S, the minimum curvature of the tip end surface 2e ′ of the switch driving portion 2e is set to 1 / RH, and the sliding contact surface 3a of the switch portion 3 is set.
The curvature of 1 is set to a smaller value 1 / RS (here, the curvature is 0 because the sliding contact surface 3a1 is planar and RS is infinite). Not limited to such a setting, the tip end surface 2e ′ of the switch driving portion 2e and the sliding contact surface 3a1 of the switch portion 3 have a curvature of the other surface when one of the surfaces has a convex cross section. It may be configured such that the relationship is smaller than the minimum curvature of the one surface.

FIG. 5 is a diagram showing how the hammer 2 drives the switch section 3. In the figure, (a) shows the initial stage of key depression (the switch driving portion 2e of the hammer 2 is the sliding contact surface 3a1 of the switch portion 3).
(At the time when the movable contact 3a2 comes into contact with the fixed contact F1), and the state at the end of key depression, that is, Moving contact 3
The state where a3 comes into contact with the fixed contact F2 and is further depressed to the full stroke (key depression lower limit) is shown.

The distance from the contact point Q where the switch driving portion 2e of the hammer 2 and the sliding contact surface 3a1 of the switch portion 3 contact to the hammer rotation axis P2 is L1, and the distance from the contact point Q to the switch rotation axis P3. Is set to L2, the position of the contact point Q gradually changes in the key-depressing stroke by the above setting. Therefore, as shown in FIGS.
The ratio L2 / L1 of the distance L2 to 1 (hereinafter referred to as “enlargement ratio EX
(P) is also gradually changed.

FIG. 6 is a diagram showing changes in the expansion ratio EXP. In the figure, the horizontal axis represents the key position ST in the key pressing stroke.
And the vertical axis represents the expansion ratio EXP. ST0 on the horizontal axis represents the key pressing start position (the position when the key is not pressed), and ST1 represents the key position when the hammer 2 comes into contact with the switch portion 3 (corresponding to FIG. 5A). STF represents a full stroke (key pressing lower limit position) (corresponding to FIG. 5C).

The position of the contact point Q changes depending on the positional relationship between the hammer rotation axis P2 and the switch rotation axis P3, and the relationship between the curvature 1 / RH of the switch driving portion 2e and the curvature 1 / RS of the sliding contact surface 3a1. , As shown in FIGS. 5A to 5C, the key moves to the left as the key is pressed. As a result, the distance L1 gradually increases, while the distance L2 gradually decreases, so that the enlargement ratio EXP is set to the key position ST1 as shown in FIG.
~ STF decreases with a nearly linear characteristic. Therefore, the rotational moment that the hammer 2 should generate in order to drive the switch unit 3, that is, the drive resistance gradually increases.

FIG. 7 is a diagram showing changes in the key depression resistance FK. In the figure, the horizontal axis represents the same as in FIG. 6, and the vertical axis represents the load (key pressing resistance FK) transmitted to the finger through the key 1.

As described above, conventionally, the use of the mass member has made it possible to obtain the characteristic of the key pressing resistance as shown in FIG. That is, the feeling of key depression is improved from the initial key depression position to the key position ST1 ″. In the first embodiment, the key depression resistance FK is further reduced by the gradual decrease of the expansion ratio EXP over the key positions ST1 to STF. 12 and the characteristic of the change of the key depression resistance is improved from that shown in Fig. 12 to that shown in Fig. 7. As a result, the key depression resistance FK over the key positions ST1 to STF is the original one of the grand piano. On the other hand, the tendency of rising to the right is similar, and in particular, the key depression resistance gradually increases just before the lower limit of key depression (see Fig. 12), etc. It is possible to reproduce the feel of the key, and moreover, since the sliding contact surface 3a1 of the switch portion 3 is formed into a flat shape (curvature 0), the enlargement ratio EX
The characteristic of P becomes linear, and it is easy to set the touch feeling.

In the present embodiment, the amount of movement of the contact point Q (the amount of change in FIGS. 5A to 5C) is relative to the distance from the hammer rotation axis P2 to the switch rotation axis P3. However, it is preferable to secure at least 10% or more of this movement amount. For that purpose, the switch driving section 2e and the switch section 3 of the hammer 2 are provided.
It suffices to sufficiently secure each length of the sliding contact surface 3a1 in the front-rear direction (left-right direction in FIG. 2).

According to the first embodiment, the minimum curvature of the tip end surface 2e 'of the switch driving portion 2e is set to 1 / RH, and the curvature of the sliding contact surface 3a1 of the switch portion 3 is set to a smaller value 1. Since / RS (curvature is 0) is set, the enlargement ratio EXP can be changed such as decreasing over the key positions ST1 to STF, and the enlargement ratio EXP can be freely set. This makes it possible to improve the characteristics of the change in the key depression resistance FK with a simple configuration.
For example, it is possible to artificially realize a key-press feeling closer to that of a grand piano. Moreover, the sliding contact surface 3 of the switch portion 3
Since a1 is formed in a flat shape (curvature is 0), the expansion ratio EXP
You can make it easier to set the properties of the.

(Second Embodiment) In a second embodiment of the present invention, a keyboard device having a drive section structure electrically reproduces a musical sound of a pipe organ based on a detected key-on signal or the like. (Not shown). Therefore, the setting of both curvatures of the switch driving portion 2e of the hammer 2 and the sliding contact surface 3a1 of the switch portion 3 is different from that of the first embodiment. A distance L1 from the contact point Q to the hammer rotation axis P2 and a distance L from the contact point Q to the switch rotation axis P3
The setting of 2 may be changed at the same time. Further, the inertia of the hammer 2 may be changed appropriately. Other configurations are first
This is the same as the embodiment.

FIG. 8 is a diagram showing a key depression resistance of a general pipe organ. The pipe organ has a characteristic that the key depression resistance FK rapidly increases at the key position ST1P due to the opening and closing of a valve (not shown).

FIG. 9 shows a key depression resistance F in the case of realizing a pipe organ in a keyboard device having a conventional drive unit structure.
It is a figure which shows K. Conventionally, normally, the contact point Q does not change depending on the key-depression stroke, so that the key-depression resistance FK exhibits the characteristic shown in FIG.

FIG. 10 is a diagram showing the setting of the enlargement ratio EXP in the drive unit structure of the keyboard apparatus according to the second embodiment. In the present embodiment, the enlargement ratio EXP over the key positions ST1 to STF is set as shown in FIG. That is, the enlargement ratio EXP is set to be small immediately after the key position ST1 and is set to be gradually increased thereafter. As a result, the key depression resistance FK can be brought close to that shown in FIG.

According to the second embodiment, the same effect as that of the first embodiment can be obtained, and in particular, the key-touch feeling closer to the pipe organ can be artificially realized.

The first and second embodiments described above can also be applied to the case where the touch feeling of a musical instrument other than the grand piano and the pipe organ is reproduced.

The switch section 3 may be of a type having only a single movable contact.

(Third Embodiment) A drive section structure according to a third embodiment of the present invention is configured so that the enlargement ratio EXP is appropriately set to improve the detection accuracy of the key pressing operation. .

FIG. 11 is a sectional view showing the outline of the structure of the drive portion of the keyboard device according to the third embodiment. The switch part 3 ″ has a first movable contact SW1 and a second movable contact SW2. The other part of the switch part 3 ″ and the hammer 2 are configured similarly to those of the first and second embodiments. .

When the hammer 2 drives the switch portion 3 ",
First, the first movable contact SW1 comes into contact with the fixed contact to be turned on (hereinafter referred to as "first make"), and then the second movable contact SW2 is similarly turned on (hereinafter referred to as "second make").

Under normal manufacturing conditions, the movable contact SW
The manufacturing error in the vertical position of each tip of SW1 and SW2 is about the same. The variation in the make-up timing is determined by the manufacturing error and the moving speed of the movable contacts SW1 and SW2 during the make-up (the lower the moving speed at the time of make-up, the larger the detection error). As in the case of an ordinary electronic keyboard instrument, assuming that the key depression resistance FK is substantially constant, the switch portion 3 ″ rotates at a constant speed, so the moving speed of each movable contact SW1, SW2 is slower for the inner one. Therefore, when the manufacturing error is the same, the inner movable contact SW2 having a slower moving speed has a larger detection error than the movable contact SW1.

In the third embodiment, the movable contacts SW1 and SW2 are set by appropriately setting the enlargement ratio EXP.
The moving speeds of are set to be approximately the same. Specifically, the enlargement ratio EXP is set to gradually increase after the first makeup, and the enlargement ratio EXP at the time of the second makeup is at least approximately LSW1 / LSW2 times as large as that at the time of the first makeup. Is set to. Here, the switch rotation axis P
Distances from 3 to the movable contacts SW1 and SW2 will be referred to as LSW1 and LSW2, respectively. When the enlargement ratio EXP becomes large, the key pressing resistance FK becomes small, so that the moving speed at the time of the second makeup naturally increases.

As a result, the variation in the detection error of the key pressing operation due to the manufacturing error between the movable contacts SW1 and SW2 is reduced, and the detection error does not depend on the movable contact SW2. Therefore, as a result, it is possible to improve the detection accuracy of the key pressing operation, particularly the detection accuracy of the key velocity. In addition,
When the detection error of the key velocity detected by the movable contacts SW1 and SW2 is large, the player feels that the feeling of key depression, especially the aftertouch is bad.
Therefore, it also contributes to the improvement of the feeling of key depression.

According to the third embodiment, the expansion ratio EX
By appropriately setting P, it is possible to improve the detection accuracy of the key pressing operation, and thus improve the feeling of key pressing. When combined with the first and second embodiments, it becomes easier to realize a real feeling of key depression such as a grand piano or a pipe organ.

The third embodiment can be applied to the drive unit structure of a keyboard device having a switch unit having a plurality of movable contacts, but the switch unit 3 has a switch rotation axis P3. It may be of a type in which one or more movable contacts are arranged on both sides.

In each of the above-described embodiments, the enlargement ratio EXP is set, the hammer rotation axis P2 and the switch rotation axis P are set.
By setting the positional relationship with respect to 3, the key touch feeling of the acoustic musical instrument was pursued and the detection accuracy of the key pressing motion was improved, but various other applications are possible. For example, when a key press operation is detected by a switch unit having a plurality of movable contacts, the key press resistance may temporarily rise each time each movable contact is made. In such a case, the rising characteristic may be analyzed and the enlargement ratio EXP may be appropriately set in order to remove a portion of the rising portion of the key depression resistance that is harmful to the touch feeling of the key depression. As a result, for example, the feeling of key depression as an electronic keyboard instrument can be further improved.

In the above-mentioned respective embodiments, the tip end surface 2e 'of the switch driving portion 2e of the hammer 2 has a convex curved surface shape, and the sliding contact surface 3a1 of the switch portion 3 has a flat surface shape.
It is not limited to this. For example, various modes can be considered, such as a mode in which both have a convex curved surface shape, a mode in which one has a convex curved surface shape and the other has a concave curved surface shape, on the assumption that the above-described combination of curvatures is secured. The advantage (facilitation of setting the enlargement ratio EXP) in the case of forming one of them in a flat shape is as described above.

In each of the above-described embodiments, the contact point Q is set so as to be located between the hammer rotation axis P2 and the switch rotation axis P3. P
You may set so that it may be located in the outer side of 3 (left or right).

In each of the above-described embodiments, the characteristic of the expansion ratio EXP can be changed only by the relationship between the hammer 2 and the switch section 3. However, the present invention is not limited to this.
For example, the key 1 (hammer driving unit 1b) and the hammer 2 (sliding contact surface 2d) may be changed. Alternatively, it may be realized by both the relationship between the hammer 2 and the switch unit 3 and the relationship between the key 1 and the hammer 2.

Further, a dedicated driving body or driven body, or both a driving body and a driven body may be provided for adjusting the feeling of key depression.

The application of the present invention is not limited to the drive section related to the key pressing operation, but can be applied to various drive sections of the keyboard device.

[0068]

As described above, according to the first aspect of the present invention.
According to the drive unit structure of the keyboard device according to the first aspect, since the position of the point where the one surface and the other surface contact each other can change in the rotation stroke of the driven body, it is necessary to drive the driven body. The rotational moment to be generated by the driving body can be changed. Therefore, the characteristic of the change in the drive resistance can be arbitrarily set with a simple configuration. In particular, it drives the driven body
Driven the rotational moment that the driving body should generate in order to
It can be changed sufficiently as the body rotates, so
It is possible to obtain a sufficient change in drive resistance. For example, if the drive unit structure is applied to the part related to the key pressing operation, it is possible to simulate the key pressing feeling of various keyboard musical instruments such as a grand piano and a pipe organ. Can be improved.

[0069]

According to the drive section structure of the keyboard device of the second aspect , the characteristic of the change of the drive resistance can be made linear with respect to the rotation stroke of the driven body. For example, if the drive unit is applied to the portion related to the key pressing operation and the key pressing detection, it becomes easy to freely set the feeling of key pressing.

According to the drive section structure of the keyboard device of the third aspect , the characteristic of the change in the key-depression resistance can be arbitrarily set during the rotation process of the driven body, and the key-depression feeling can be freely set. be able to. Further, even when a plurality of key switches are provided to detect the key velocity, the feeling of key depression is improved due to the improvement in the detection accuracy of the key velocity.

[Brief description of drawings]

FIG. 1 is a perspective view showing a configuration of a drive unit structure of a keyboard device according to a first embodiment of the present invention.

FIG. 2 is a side sectional view of the same structure taken along line II-II in FIG.

FIG. 3 is a side sectional view (key depressed state) of the same structure taken along the line II-II in FIG. 1.

FIG. 4 is a cross-sectional view taken along line VV of FIG. 1 showing a detailed configuration of a switch unit having the same structure.

FIG. 5 is a diagram showing how a hammer having the same structure drives a switch unit.

FIG. 6 is a diagram showing a change in enlargement ratio EXP in the same structure.

FIG. 7 is a diagram showing changes in key depression resistance FK in the same structure.

FIG. 8 is a diagram showing key depression resistance of a general pipe organ.

FIG. 9 is a diagram showing a key depression resistance FK when a pipe organ is realized by a keyboard device having a conventional drive unit structure.

FIG. 10 is a diagram showing setting of an enlargement ratio EXP in a drive unit structure of a keyboard device according to a second embodiment.

FIG. 11 is a cross-sectional view showing an outline of a drive unit structural configuration of a keyboard device according to a third embodiment.

FIG. 12 is a diagram showing a key depression resistance in an electronic keyboard musical instrument having a drive unit structure of a conventional keyboard device using a mass member.

FIG. 13 is a cross-sectional view showing a part of a drive unit structure of a conventional keyboard device having a switch unit composed of a flexible member.

[Explanation of symbols]

1 key 1a Key fulcrum 2 Hammer (actuator) 2a Hammer fulcrum 2e Switch driver 2e 'tip surface 3 Switch part (driven body) 3a1 Sliding surface 3c Hinge part 3a2 movable contact (key switch) 3a3 movable contact (key switch) 3a bulge 4 chassis 8 switch board 9 Support members 9a Hammer support Q This contact F1 fixed contact F2 fixed contact P2 Hammer rotation axis (second rotation fulcrum) P3 switch rotation axis (first rotation fulcrum)

Claims (3)

(57) [Claims] 1. A driven body that is rotatable about a first rotation fulcrum, and is rotatable about a second rotation fulcrum, and contacts the driven body to rotate the driven body. A drivable actuator is provided, and one surface of the surface of the driven body that abuts the actuator and one surface of the surface of the actuator that abuts the driven body are formed in a convex curved shape, and the curvature of the other surface is A contact point at which the actuator and the driven body come into contact with each other, which is set to a value smaller than the minimum curvature of the one surface.
The amount of movement of the second rotation fulcrum from the first rotation fulcrum
Before at least 10% of the distance to
Note that the respective curvatures of one surface and the other surface are set . 2. The drive unit structure for a keyboard device according to claim 1, wherein the other surface is formed in a flat shape. 3. A key and a switch board are provided so that the actuator is rotated by a key pressing operation, and the driven body is provided with a key switch for contacting the switch board to detect the key pressing operation. Claims characterized by
Item 3. A drive unit structure of the keyboard device according to Item 1 or 2 .