JP3711938B2 - Switch drive mechanism for electronic musical instruments - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a switch drive mechanism for an electronic musical instrument that is suitable for use in a keyboard device and an effect applying switch.
[0002]
[Prior art]
FIG. 4 is an explanatory view showing an outline of a keyboard mechanism of a conventional electronic musical instrument.
In the figure, 41 is a key (illustrated for a white key), 41a is a pressing piece, 42 is a frame, 43 is a support part, 43a and 43b are force transmission parts, 44 is a fulcrum part, 45 is a hammer, and 46a and 46b are stoppers. , 47 is a key guide, 48 is a leaf spring for preventing dropping, 1 is a substrate, 49 is a locking piece, 4 is an actuator (pushing element), and 50 is a switch drive mechanism.
When the performer presses the key 41, the key 41 is pressed with its root portion as a fulcrum, and the pressing piece 41a rotates about the fulcrum portion 44 around the fulcrum portion 44 via the force transmission portions 43a and 43b. Let A hammer 45 is attached to the support portion 43, and the hammer 5 rotates from a lower stopper 46a formed of a cushioning material toward an upper stopper 46b. On the substrate 1, there are a locking piece 10 and a switch drive mechanism 50. The actuator 4 provided in a part of the support unit 3 abuts on the switch drive mechanism 50 to operate the switch.
[0003]
Figure 5 is a sectional view showing a conventional example of a switch driving mechanism 50 shown in FIG. Fig. 4 illustrates a typical mechanism with a driven body having a rotational fulcrum and having one or more inner dome contacts.
In the figure, the same reference numerals are given to the same parts as FIG. Reference numeral 2 denotes a driven body, which is formed of an elastic material made of resin. 2a is a base portion, 2b is a hinge portion, 2c is a driven body portion, 2d is a first recess, 2e is a second recess, 2f is a first inner dome, 2g is a second inner dome, and 2h is The third recess 2i is a fourth recess 2j is a skirt. 3a is a first movable contact, and 3b is a second movable contact.
FIG. 5 (a) shows a state when the actuator 4 starts to contact the driven body main body 2c. FIG. 5 (b) shows a state where the actuator 4 presses the driven body main body 2c and two of the two switches. The state when the first one is turned on is shown.
[0004]
In FIG. 5 (a), the driven member 2 is attached to the substrate 1 in a thin plate-like base portion 2a thick, the underside end of the driven body portion 2c of the top end edge and the thick of the base portion 2a The edge is joined by the hinge part 2b. The base portion 2a has a structure common to a plurality of keys for white keys or black keys. On the other hand, the driven body portion 2c has a structure that operates independently for each key.
As the overall shape of the driven body portion 2c, for example, the hinge portion 2b side is a rectangular shape, and the second concave portion 2e side is a semicircular flat plate. The width of the actuator 4 (perpendicular to the paper surface) is substantially equal to the width of the driven body main body 2c (perpendicular to the paper surface), and is larger than the diameters of the first and second recesses 2d and 2e. An outer dome made of the same elastic material may be provided around the driving body 2c except for the hinge 2b. In the figure, 2j indicates the position of the skirt portion of such an outer dome.
Before the actuator 4 presses the upper surface of the driven body main body 2c, the driven body main body 2c is separated from the substrate 1 at an angle by the elastic force of the hinge 2b. When the actuator 4 presses the upper surface of the driven body main body 2c, the hinge 2b serves as the rotation fulcrum 2b and the driven body 2c rotates.
[0005]
On the upper surface of the driven body portion 2c, there are a first recess 2d and a second recess 2e having circular holes in order from the side closer to the center of rotation. The bottom surfaces of these recesses are provided with a first inner dome 2f and a second inner dome 2g each having a truncated cone shape. The third recess 2f and the fourth recesses on the lower surface of the driven body portion 2c are provided. Projecting from each of the recesses 2i.
Movable contacts 3a and 3b are provided on the surfaces of the first and second inner domes 2f and 2g facing the substrate 1, respectively. Although not shown in the drawings, on the upper surface of the substrate 1, fixed contacts formed by a pair of conductive patterns are provided in portions facing the first and second movable contacts 3a and 3b, respectively. Accordingly, the first inner dome 2f and the movable contact 3a, and the second inner dome 2g and the movable contact 3b constitute first and second switch portions.
[0006]
In FIG. 5 (b), when the performer presses the key 41, the actuator 4 is brought into contact with the upper surface of the driven body 2, slightly sliding the upper surface. The driven body 2 is rotated, and the first and second switch portions described above abut on the substrate 1 side in this order to perform a switch-on operation. When the first switch portion comes into contact with the substrate 1, the thin skirt portion of the first dome 2f is deformed and bent. The same applies to the second switch section.
The time difference from the timing at which the first switch operates (turns on) to the timing at which the second switch operates (turns on) becomes the key pressing speed (initial touch) of the key 1, and the sound source of the electronic musical instrument In this section, it is used to control a musical sound signal.
[0007]
The conventional switch driving mechanism having the rotation fulcrum as described above can increase the operation angle of the hammer 45 shown in FIG. 4 , and thus has a great advantage such as good touch feeling and good operation stability of the switch. have.
However, the position where the actuator 4 abuts against the driven body main body 2c avoids the first recess 2d and the second recess 2e, and is an intermediate portion between the two.
Thus, in the moment when the first switch unit as shown is in contact with the substrate 1, F _A, F _1, F _P becomes a force acts on the driven body section 2c. F _A is the pressing force of the actuator 4 (downward), F ₁ is a dome reactive force (upward) inner substrate 1 is pressed through the first inner dome 2f, F _P substrate 1 hinge portion 2b It is the force pulling through (downward).
[0008]
Therefore, the driven body main part 2c is necessarily deformed. As a result, operating the switch in a reliable timing, in other words, whether the operating switch in the correct stroke position of the actuator 4, reducing the inner dome reaction force F ₁ to a negligible level the influence of the deformation, the It was necessary to examine the material and thickness of the driver body 2c.
On the other hand, when it is desired to increase the pressing force F _A of tactilely really actuator 4, design modifications of the driven body section 2c running takes inner dome reaction force F ₁ greater on the assumption has been strong. However, the factor of variation in the deformation state is an additional factor of error, which is another sacrifice.
[0009]
[Problems to be solved by the invention]
The present invention has been made to solve the above-described problems, and can accurately detect the timing according to the stroke position of the actuator by preventing deformation of the driven body during the switch operation. It is an object of the present invention to provide a switch drive mechanism for an electronic musical instrument that can accurately detect an accurate timing difference corresponding to a difference in stroke position of an actuator.
[0010]
[Means for Solving the Problems]
According to a first aspect of the present invention, in the switch driving mechanism for an electronic musical instrument provided with an actuator, a board, and a driven body, the driven body has two switches facing the board. A portion is provided, which is in contact with the actuator and rotates around a rotation fulcrum, and the two switch portions are in contact with the substrate by the rotation of the driven body and perform a switch operation, Of the two switch parts, the switch part where the contact part first contacts the substrate is positioned on the line of action of the driving force of the actuator immediately after the contact part contacts the substrate. Are provided on the driven body.
Therefore, the switch portion where the contact portion first contacts the substrate prevents the driven body from being deformed during the switch operation by the contact portion immediately after the contact being positioned on the actuator driving force acting line. Therefore, the switch unit can be operated at an accurate timing corresponding to the stroke position of the actuator.
Since the deformation of the driven body can be prevented, the other switch unit can be operated at an accurate timing corresponding to the stroke position of the actuator. As a result, an accurate timing difference corresponding to the difference in actuator stroke position can be detected with high accuracy.
Note that the above-described rotation center is accompanied by an entity such as a hinge portion, and if the rotation center of the driven body is substantially present, the rotation center may not be present.
[0011]
According to a second aspect of the present invention, in the switch driving mechanism for an electronic musical instrument provided with the actuator, the substrate, and the driven body, the driven body is provided with a plurality of switch portions facing the substrate. The plurality of switch portions are in contact with the substrate by the rotation of the driven body to perform a switch operation, and the plurality of switches are in contact with the actuator. The first switch portion is provided on the driven body so that the first switch portion is positioned on the line of action of the driving force of the actuator immediately after the contact portion of the first switch portion contacts the substrate. are made by and first contact with the substrate switch portion of the first is at the plurality of switch portions, of the plurality of switch portions, the second switch unit, the first switching unit Next to It is intended to abut against the substrate.
Therefore, the switch operation of the first and second switch sections can be performed at an accurate timing corresponding to the stroke position of the actuator. As a result, difference information at the time of switch operation by the first and second switch units can also be detected with high accuracy. As a result, an accurate timing difference corresponding to the difference in actuator stroke position can be detected with high accuracy.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a cross-sectional structure diagram showing an embodiment of the present invention.
In the figure is omitted, FIG. 4, description will be denoted by the same reference numerals are used for the same parts as FIG. The state immediately after the actuator 4 depresses the driven body portion 2c and first turns on the first switch on the side close to the rotation fulcrum 2b is shown.
Here, the first switch portion is provided on the driven body 2 so that the contact portion (movable contact 3a) is positioned on the line of action of the driving force of the actuator 4 immediately after contact with the substrate. Yes.
When the actuator 4 starts to press the driven body main body 2c, the hinge 2b serves as a rotation fulcrum and the driven body 2c rotates, and the first and second switch sections turn the substrate 1 in this order. Switch-on operation by contacting the side.
Since the width of the actuator 4 (perpendicular to the paper surface) is larger than the diameter of the first recess 2d, the driven body portion 2c can be pressed.
[0013]
The inner dome reaction force (drag) F ₁ is generated against the pressing force F _{A of the} actuator 4 as the pressing operation of the actuator 4 progresses immediately after contact with the substrate 1, but F ₁ is on the same line as F _A. So they cancel each other out.
Accordingly, unnecessary force is not transmitted to the internal structure of the hinge portion 2b or the driven body main body portion 2c serving as a rotation fulcrum. Therefore, only the first inner dome 2f is deformed according to the stroke, and the driven body portion 2c itself is not deformed. As a result, the operation of the first switch unit can be performed at an accurate timing corresponding to the accurate stroke position of the actuator 4.
[0014]
FIG. 2 is a cross-sectional structural view showing another embodiment of the present invention. In the figure, the description thereof is omitted the same reference numerals are given to the same parts as FIG.
In the figure, reference numeral 22 denotes a driven body, which is formed of an elastic material made of resin. 22a is a base part, 22b is a hinge part, 22c is a driven body part, 22f is a first inner dome, 22g is a second inner dome, 23a is a first movable contact, and 23b is a second movable contact. is there. The first inner dome 22f and the first movable contact 23a provided on the lower surface thereof constitute a first switch part, and the second inner dome 22g and the second movable contact 23b provided on the lower surface thereof are the first. 2 switch sections are configured.
[0015]
Compared with the switch drive mechanism shown in FIG. 1, the present embodiment reverses the arrangement of the first and second switch parts, and the first movable part located on the side far from the hinge part 22b serving as a rotation fulcrum. The contact 23a comes into contact with the substrate 1 first. Immediately after this contact, the movable contact 23 ₁ of the first inner dome is positioned on the line of action of the driving force of the actuator 4. Other components are the same as those in FIG.
FIG. 2 shows a state immediately after the _first movable contact 23 _{1 that} is turned on _first is in contact with the substrate 1, although the distance from the rotation fulcrum 22b is second.
Also in such a switch drive structure, the pressing force F _A of the actuator 4 and the inner dome reaction force F ₁ generated against it are on the same line of action and cancel each other, so that the hinge portion 22b and the driven body Unnecessary force is not transmitted to the internal structure of the main body 22c. Therefore, the driven body main body 22c itself is not deformed. As a result, the operation of the first switch unit can be performed at an accurate timing corresponding to the accurate stroke position of the actuator 4.
[0016]
FIG. 3 is a cross-sectional structure diagram showing still another embodiment of the present invention.
In the figure, the description thereof is omitted the same reference numerals are given to the same parts as in FIG. 5. Reference numeral 32 denotes a driven body, which is formed of an elastic material made of resin. 32a is a base part, 32b is a hinge part, and serves as a rotation fulcrum. Reference numeral 32c denotes a driven body main body. Reference numerals 32 ₁ , 32 ₂ , 32 ₃ , and 32 ₄ denote first to fourth inner domes, together with movable contacts 33 ₁ , 33 ₂ , 33 ₃ , and 33 ₄ provided on the bottom surface thereof, to the first to fourth. The switch part is configured . Switch part is n a switch drive mechanism. In addition to initial touch at the time of key operation, it is used to detect aftertouch.
However, in order to simplify the description, the four switch portions are numbered 1 to 4 in the order in which the switch body abuts against the substrate 1 by the rotation of the driven body portion 32c.
Of these, the first inner dome 32 ₁ is provided on the driven body portion 32 c so that the first movable contact 33 ₁ is positioned on the line of action of the driving force of the actuator 4 immediately after contact with the substrate 1. It has been .
The distance to the switching portion of the hinge portion 32b do not follow the contact order.
[0017]
However, two switch portions of the set of contact sequence are continuous, in the illustrated example, you focus for the set of the first switch unit and the second switch unit.
First, the first movable contact 33 ₁ in the previous abutting to the substrate 1, the movable contact of the contact already does.
Immediately after the first movable contact 33 ₁ abuts against the substrate 1, the pressing force F _A of the actuator 4 and the first inner dome reaction force (drag) F ₁ are on the same line of action, so they cancel each other out. . Accordingly, as in FIGS. 1 and 2 , the driven body portion 32 c itself is not deformed, so that the operation of the first switch portion can be performed at an accurate timing corresponding to the accurate stroke position of the actuator 4.
[0018]
For this reason, the first switching unit by the movable contact 33 ₁ of the inner dome 32 ₁ first, and, second th switch by the movable contact 33 ₂ of the next second internal dome 32 ₂ adjacent thereto The timing at which the part is turned on (stroke position of the actuator 4) depends on the set shape, and the influence of the deformation element during operation can be eliminated.
As a result, even in the case of FIG. 3 , the accuracy of the first and second switch operations is high, so that the respective timings and timing difference values can be detected with high accuracy.
[0019]
More generally, the contact order of the substrate 1 of a movable contact and i, a case where the contact with a predetermined two movable contacts i = 1, 2 are continuously present, the movable contact i = The contact portion 1 may be provided on the driven body 32 so as to be positioned on the line of action of the driving force of the actuator 4 immediately after contact with the substrate. That is, the movable contact i = 1, among the movable contact of the entire hand, initially in contact with the substrate, the movable contact i = 2 would contact the substrate to the next variable dynamic contact i = 1.
[0020]
The above-described switch driving mechanism not only improves the functionality of the switch operation, but also functions as an acting force generator that controls the key pressing operation. That is, by adjusting the reaction force of the inner dome having a movable contact located on the line of action of the driving force of the actuator without deforming the driven body, and transmitting this reaction force to the actuator side, the switch An appropriate reaction force having a good touch feeling can be generated for the operator.
In the above description, the switch driving mechanism used for the keyboard device has been described as an application that makes use of such features. In addition, it can also be used as an effect imparting switch for an electronic musical instrument. The structure on the operator side up to the actuator may be a mechanism suitable for each application. A one-make (one switch) structure with a good touch feeling may be used. If a multi-make (multiple switches) structure is used, the tone and filter parameters of the musical tone signal generated by the electronic musical instrument can be controlled in response to a touch on an operation input section (corresponding to a key) of a switch (not shown). it can.
[0021]
【The invention's effect】
As is apparent from the above description, the present invention can prevent the driven body from being deformed during the switch operation, and thus has an effect of accurately detecting the timing according to the stroke position of the actuator.
Further, there is an effect that an accurate timing difference corresponding to the difference in the stroke position of the actuator can be detected with high accuracy.
It not only improves the functionality of the switch operation, but also functions as an acting force generator that controls the operation of the operator.
[Brief description of the drawings]
FIG. 1 is a cross-sectional structure diagram showing an embodiment of the present invention.
FIG. 2 is a cross-sectional structural view showing another embodiment of the present invention.
FIG. 3 is a cross-sectional structure diagram showing still another embodiment of the present invention.
FIG. 4 is an explanatory diagram showing an outline of a keyboard mechanism of a conventional electronic musical instrument.
FIG. 5 is a cross-sectional structure diagram showing a conventional example of the switch drive mechanism shown in FIG. 4 ;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Board | substrate, 2, 22 , 32 ... Driven body, 2a , 22a, 32a ... Base part, 2b , 22b, 32b ... Hinge part, 2c , 22c, 32c ... Driven body part, 2d ... 1st 1 recess 2e 2nd recess 2f 22f first inner dome 2g 22g second inner dome 2h third recess 2i fourth recess 2j outer dome Position of the skirt portion when provided, 3a , 23a ... first movable contact, 3b , 23b ... second movable contact

Claims (2)

In a switch drive mechanism for an electronic musical instrument provided with an actuator, a substrate, and a driven body,
The driven body is provided with two switch portions opposed to the substrate, and abuts on the actuator to rotate around a rotation fulcrum,
The two switch parts are in contact with the substrate by the rotation of the driven body to perform a switch operation,
Of the two switch parts, the switch part where the contact part first comes into contact with the substrate is positioned on the line of action of the driving force of the actuator immediately after the contact part comes into contact with the substrate. Provided to the driven body.
A switch driving mechanism for an electronic musical instrument. In a switch drive mechanism for an electronic musical instrument provided with an actuator, a substrate, and a driven body,
The driven body is provided with a plurality of switch portions opposed to the substrate, and abuts on the actuator and rotates around a rotation fulcrum,
The plurality of switch portions are in contact with the substrate by the rotation of the driven body to perform a switch operation,
Of the plurality of switch portions, the first switch portion is positioned so as to be positioned on the line of action of the driving force of the actuator immediately after the contact portion of the first switch portion contacts the substrate. The first switch part is first abutted on the substrate in the plurality of switch parts,
Wherein the plurality of switch portions, the second switch unit abuts on the substrate in the following the first switch unit,
A switch driving mechanism for an electronic musical instrument.

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