JP2004117975A - Keyboard device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To approach keying touch of a keyboard of an electronic musical instrument to contact feeling of an acoustic piano while a small shape is maintained as it is. <P>SOLUTION: A keyboard device includes keys for the electronic musical instrument rotatably supported at one end and imparted at the other end by an elastic deviation force upward by a deviating force of a spring, held at a predetermined upper limit position by imparting the deviation force to a stopper and rotated downward at a predetermined stroke from this predetermined upper limit position, hammer arms having a hammer mounted at at least one end of a space of a lower part of the key, a hammer roller mounted at both pair sides from the end mounted with the hammer from a rotary fulcrum of the arm, a jack brought into contact with a peripheral surface of the hammer roller rotatably mounted on a lower surface of the key to transmit a pressing force of the key to the arm via the hammer roller, and a repetition arm stored in the jack for imparting a downward pressure contact force to the roller when the jack is disengaged from the roller. <P>COPYRIGHT: (C)2004,JPO

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a keyboard device for an electronic keyboard instrument, and more particularly to providing a keyboard device that is small in shape and can give a finger as close as possible to an acoustic piano when playing.
[0001]
TECHNICAL FIELD OF THE INVENTION
[0002]
[Prior art]
Since an electronic keyboard instrument generally acts as a keyboard for turning on and off an electric switch, it is far from the key touch (feeling given to a finger at the time of tapping) of an acoustic piano (a piano that strikes a string with a hammer). It was a touch. However, in an electronic keyboard musical instrument that simulates a piano sound like an electronic piano, the key touch tends to require the touch of an acoustic piano. For this purpose, various attempts have been made to make the key touch at the time of keying resemble that of an acoustic piano.
[0003]
For example, a plurality of keys arranged side by side for each pitch, and a lever device in which a plurality of levers corresponding to the keys are actuated in the middle of a key depression stroke are provided. A keyboard device for an electronic musical instrument has been proposed in which operating force characteristics are configured such that the operating force decreases as the lever stroke increases (for example, Patent Document 1).
In addition, a keyboard device for an electronic musical instrument, in which a key is provided on a keyboard frame so as to be swingable up and down, and a hammer is provided below the key to rotate by receiving an acting force when the key is pressed and to return when the pressing operation is released. In this regard, there has been proposed a keyboard device for an electronic musical instrument in which a contact point between a key and a hammer at the time of a key pressing operation is provided on a plane including a diameter connecting the rotation center of the key and the rotation center of the hammer (for example, Patent Document 2).
[0004]
[Patent Document 1]
Japanese Patent Publication No. 7-7267 [Patent Document 2]
Japanese Patent Publication No. 8-7572
[Problems to be solved by the invention]
The keyboard device proposed in Patent Literature 1 has only a key of a seesaw structure and a lever for applying a load structurally, and has no hammer. Therefore, it is not possible to obtain a feeling of jumping up a hammer like an acoustic piano.
That is, in an acoustic piano, when a key is pressed at a certain initial speed or higher, the hammer jumps up. Therefore, during a normal performance, it is not felt during the let-off period, but when the key is pressed down slowly, the let-off is obtained. However, in the structure proposed in Patent Document 1, the load on the lever is always applied to the key regardless of the speed of keying, so that the feel is different from that of an acoustic piano.
[0006]
On the other hand, the keyboard device proposed in Patent Document 2 has a structure in which the key directly presses the hammer and feels a load by leverage principle. There is a disadvantage that no feeling can be obtained.
SUMMARY OF THE INVENTION An object of the present invention is to propose a keyboard device capable of obtaining a feeling close to the key touch of an acoustic piano without limit.
[0007]
[Means for Solving the Problems]
According to the first aspect of the present invention, one end is rotatably supported, and the other end is provided with an elastic biasing force upward by the biasing force of the spring, and the elastic biasing force is applied to the stopper and held at a predetermined upper limit position. A key for an electronic keyboard instrument capable of rotating downward from the predetermined upper limit position by a predetermined stroke, a hammer arm having a hammer attached to at least one end in a space of the key, and a rotation of the hammer arm. A hammer roller mounted on the opposite side of the end where the hammer is mounted from the pivot point, and a rotatably mounted lower surface of the key, which comes into contact with the peripheral surface of the hammer roller to reduce the pressing force of the key via the hammer roller. And a repetition arm that applies downward pressure to the hammer roller when the jack is disengaged from the hammer roller. To propose a panel devices.
[0008]
According to the second aspect of the present invention, one end is rotatably supported, and the other end is provided with an elastic biasing force upward by a biasing force of a spring. A key for an electronic keyboard instrument that can be turned downward with a stroke of the key; and a key that is rotatably supported on the lower surface of the key in a posture that is substantially the same as the key turning surface. A jack composed of an operating lever protruding downward from the fulcrum and a sub-lever protruding in a direction crossing the extension direction of the operating lever from the pivot, and a lower end position of the operating lever of the jack A hammer arm rotatably supported by a frame at a position displaced slightly toward the pivot point of the key and having a position substantially the same as the rotation surface of the key at the lower portion of the key; C attached to the end of the key near the pivot point A hammer roller mounted on the hammer arm such that the lower end surface of the operation lever portion of the jack is in contact with the circumferential surface at a position displaced from the rotation fulcrum position of the hammer arm toward the pivot free end of the key; An extension part protruding from the hammer arm and extending from the mounting position of the hammer roller to the pivot free end side of the key, an extension rod protruding downward from the lower surface of the key pivot free end side, and an extension rod A repetition lever that is rotatably mounted and applies a downward elastic biasing force to the hammer roller, a repetition spring that applies a biasing force to return the jack to the initial position when the key returns to the upper limit position, and a hammer arm of the extension rod. A keyboard device comprising a back check cloth which is mounted on a surface facing an extension and is made of a vibration absorbing material is proposed.
According to a third aspect of the present invention, there is provided a keyboard device according to any one of the first and second aspects, wherein a sensor for detecting a swing speed of the hammer is added to a space below the key.
[0009]
Action <br/> the hard strike the key according to the structure of a keyboard apparatus according to the invention, the pressing force is transmitted to the hammer roller through the operation lever portion which constitutes a jack, provided in the hammer arm via a hammer roller, The hammer is swung up, giving the touch of an acoustic piano.
On the other hand, when the key is pressed down weakly, when the pressed amount reaches a predetermined position, the operation lever unit constituting the jack is disengaged from the hammer roller, and at this time, the repetition lever holds the swinging position of the hammer arm. By this operation, the weight of the hammer transmitted to the key is eliminated, and a let-off feeling is obtained.
As described above, according to the present invention, the feel of the keystroke changes according to the strength of the keystroke, and the feel of the keystroke of the acoustic piano can be made as close as possible. Further, according to the present invention, since all the mechanisms for obtaining the feel of keying of the acoustic piano are stored in the space below each key, there is an advantage that the feeling of keying can be improved without increasing the size of the keyboard.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
One embodiment of a keyboard device according to the present invention will be described with reference to FIGS. 1 shows a state in which the white key 10A is not pressed, FIG. 2 shows a state in which the white key 10A is pressed, FIG. 3 shows a state in which the black key 10B is not pressed, and FIG. 4 shows a state in which the black key 10B is pressed. The difference between the white key 10A and the black key 10B is that the white key 10A has a structure in which the repetition lever 20 is supported by a protruding rod 11A projecting downward from the back surface of the white key 10A, whereas the black key 10B is black. The structure is such that the repetition lever 20 is supported by an extension 11B (see FIGS. 3 and 4) extending rearward of the key 10B. In other structures, the white key 10A and the black key 10B have the same structure. Therefore, the description will be made mainly with respect to the white key 10A shown in FIGS.
[0011]
One end of the white key 10A is rotatably mounted on the frame 100, and an upward elastic biasing force is applied to the free end side (white key portion) by the biasing force of the spring 12.
The upward elastic biasing force is received by the stopper 13. Therefore, the white key 10A stops at the position determined by the stopper 13, and this stop position is defined as the upper limit position. When the white key 10A is pressed, the lower end of the protruding rod 11A contacts the key stopper 14 as shown in FIG. 2, the lower limit position is determined, and the stroke of the white key 10A is determined by the upper limit position and the lower limit position.
[0012]
The feature of the present invention is that the repetition lever 20, the jack 30, the hammer arm 40, the hammer roller 50 attached to the hammer arm 40, and the back check loss 60 are accommodated in the lower spaces of the white key 10A and the black key 10B. This is the point of the structure.
The repetition lever 20, the jack 30, the hammer arm 40, and the hammer roller 50 are provided to make the key touch of the white key 10A and the black key 10B resemble the touch of an acoustic piano without limit.
[0013]
Incidentally, in an acoustic piano, the repetition lever 20, the jack 30, the hammer arm 40, the hammer roller 50, the back check cloth 60, and the like are provided on the extension of the white key and the black key, and the keyboard and the hammer striking mechanism are separately provided. Because of the arrangement, the space occupied by the hammer striking mechanism is required widely.
According to the present invention, since the strings are not struck by a hammer, the drive mechanism of the hammer is stored under each key, and the key touch of the acoustic piano is obtained in a small space.
[0014]
The reason why the key touch feeling of an acoustic piano can be obtained by the structure according to the present invention will be described below.
A jack 30 is movably mounted on the lower surface of each key 10A, 10B by a support shaft 31. The rotation surface of the jack 30 is a surface parallel to the rotation surfaces of the keys 10A and 10B. The operation lever portion 30A extends downward from the support shaft 31 and the operation lever portion 30A crosses the operation lever portion 30A. And a protruding auxiliary lever portion 30B. The lower end of the operation lever portion 30A comes into contact with the arc surface of the hammer roller 50 to be in an initial state (key is not pressed).
[0015]
The hammer roller 50 is mounted on the hammer arm 40. Like the jack 30, the hammer arm 40 is rotatably supported by a shaft 41 such that a surface parallel to the rotation surfaces of the keys 10A and 10B becomes a rotation surface. A hammer (substantially weight) 42 is attached to the end opposite to the position of the hammer roller 50 with the position of the shaft 41 interposed therebetween. Give a response.
That is, the pressing force at the time of keying is given to the hammer roller 50 through the operation lever 30 </ b> A of the jack 30, and transmitted to the hammer arm 40 via the hammer roller 50. When the keys 10A and 10B are pressed down strongly, the operating lever 30A constituting the jack 30 instantaneously applies a pressing force to the hammer roller, so that the hammer 42 is flipped up almost instantaneously, and the tapping given by the weight of the hammer 42 is performed. A feeling is obtained.
[0016]
When the jumped-up hammer 42 starts dropping, the extension 43 extending from the end of the hammer arm 40 comes into contact with the back check cloth 60, and while the keys 10A and 10B keep the pressed state, the hammer 42 is in that position. The held up position of the hammer 42 is maintained.
Next, when the key 10A or 10B is pressed down weakly, the lower end of the operation lever 30A constituting the jack 30 applies a pressing force to the hammer arm 40 via the hammer roller 50. When the depression amount of the key 10A or 10B reaches a position where the depression amount is reached, the sub lever 30B constituting the jack 30 comes into contact with the jack stopper 32 (see FIGS. 2 and 4), and the operation lever portion 30A is rotated clockwise in the example of the drawing. , And its tip moves in a direction to disengage from the state of engagement with the hammer roller 50.
[0017]
The repetition lever 20 applies a weak downward force to the hammer roller 50 by the spring 21. However, when the repetition lever 20 starts to contact the repetition stopper 22, the biasing force from the repetition lever 20 to the hammer roller 50 is eliminated. The entire weight of the hammer 42 is transmitted to the operation lever 30A, and a strong reaction force is applied to the keys 10A and 10B (this timing is similar to the time when the hammer 42 strikes a string). When the operating lever 30A is disengaged from the hammer roller 50 from this state, the hammer 42 falls slightly, and at this time, the hammer roller 50 comes into contact with the repetition lever 20 and is received by the biasing force of the repetition lever 20. Can be As a result, the reaction force applied to the keys 10A and 10B is rapidly reduced, and a let-off similar to that of an acoustic piano is obtained.
[0018]
As described above, according to the present invention, it is characterized in that different keystrokes are obtained when the keys are strongly pressed and when the keys are weakly pressed, and this is as close as possible to the keystrokes of an acoustic piano. .
In the present invention, the repetition spring 23 is further provided for the jack 30. The repetition spring 23 is also provided on the acoustic piano. When the keys 10A and 10B return to the non-pressed positions due to the presence of the repetition spring 23, the jack 30 is moved to the initial position by the biasing force of the repetition spring 23. (The state in which the lower end of the operation lever portion 30A is in contact with the upper part of the hammer roller 50) can be quickly returned to the state where the next key can be pressed. As a result, high-speed continuous hitting is possible. This point can also be approximated to the key touch of an acoustic piano.
[0019]
The present invention further claims that a sensor for detecting the swinging speed of the hammer 42 is provided. In the embodiment shown in FIGS. 1 to 4, a transmission type optical switch (a light emitting element and a light receiving element are arranged to face each other in the course of the rotation of the hammer 42, and the hammer 42 passes between them to hit the light receiving section. A case is shown in which a switch 70 that blocks light and detects passage of the hammer 42 is provided, and the swinging speed of the hammer 42 is detected based on the light blocking time of the optical switch 70 and the size of the hammer 42.
[0020]
In this case, by selecting the mounting position of the optical switch 70, the swinging speed of the hammer 42 and the time during which the keys 10A and 10B are pressed can be detected.
That is, according to the embodiment shown in FIGS. 1 to 4, if the keys 10A and 10B are continuously pressed down after the keys are hit, the hammer arm 40 is moved by the repetition lever 20 and the back check cloth 60 attached to the keys 10A and 10B. It is tied up at the raised position and stops at a position slightly dropped from the raised position. By installing the optical switch 70 at this position, it is possible to detect the time when the hammer 42 passes and the timing when the keys 10A and 10B are pressed and released from the pressing operation. FIG. 5 shows this state. FIG. 5A shows the movement position of the hammer 42. H1 indicates the position of the hammer 42 when the keys 10A and 10B are not pressed. When the key 10A or 10B is pressed, the position of the hammer 42 starts to rise. When the hammer 42 reaches the light blocking position H2 of the optical switch 70, the optical switch 70 outputs a detection signal of, for example, L logic shown in FIG. 5B.
[0021]
When the hammer 42 reaches the position H4 and passes the position of the optical switch 70, the detection signal returns to the H logic. By measuring the time T1 of the L logic of the detection signal, the passing speed of the hammer 42 can be detected. Further, the rising timing TM1 is used as a sound generation start timing.
When the hammer 42 reaches the uppermost position and the operation lever 30A of the jack 30 comes off the hammer roller 50, the position of the hammer 42 is stopped at the position H3 where the back check cloth 60 has slightly dropped from the uppermost position. By setting the rest position in the light blocking range of the optical switch 70, the detection signal of the optical switch 70 falls to L logic again. This L logic state is maintained while the keys 10A and 10B are being pressed, and when the pressing operation is released, the detection signal rises to the H logic. Therefore, by detecting the rising timing TM2, the timing of stopping the sound can be detected.
[0022]
In this manner, the swinging speed of the hammer 42 is used for volume control, and the timings TM1 and TM2 of the pressing operation can be used for the timing of starting and stopping the sound generation.
[0023]
【The invention's effect】
As described above, according to the present invention, the repetition lever 20, the jack 30, the hammer arm 40, the hammer roller 50, and the back check cloth 60 are all stored in the space below each key 10A or 10B. The key touch can be made closer to the feel of an acoustic piano while keeping the shape of the piano small.
Further, by providing the optical switch 70, the swinging speed of the hammer 42 and the timing of starting and stopping the sound generation can be detected, and the sense of the sound and the key touch can be made closer to that of an acoustic piano.
[Brief description of the drawings]
FIG. 1 is a sectional view illustrating a state in which a white key is at a non-pressed position for explaining an embodiment of the present invention;
FIG. 2 is a sectional view for explaining a state in which a white key is pressed from the state in FIG. 2;
FIG. 3 is a cross-sectional view illustrating a state where a black key is at a non-pressed position for explaining an embodiment of the present invention;
FIG. 4 is a sectional view for explaining a state where a black key is pressed from the state of FIG. 3;
FIG. 5 is a timing chart for explaining the operation of the means for detecting the speed at which the hammer swings up according to the present invention.
[Explanation of symbols]
10A White key 30A Operation lever part 10B Black key 30B Secondary lever part 11A Protruding rod 31 Support shaft 11B Extension part 32 Jack stopper 12 Spring 40 Hammer arm 13 Stopper 41 Shaft 20 Repetition lever 42 Hammer 21 Spring 43 Extension part 22 Repetition stopper 50 Hammer Roller 23 Repetition spring 60 Back check cloth 30 Jack 70 Optical switch

Claims (3)

One end is rotatably supported, and the other end is provided with an elastic biasing force upward by a biasing force of a spring. The elastic biasing force is applied to a stopper and held at a predetermined upper limit position. A key for an electronic keyboard instrument that can rotate downward with a predetermined stroke from
A hammer arm having a hammer mounted on at least one end thereof in a lower space of the key; a hammer roller mounted on a side opposite to an end of the hammer arm on which the hammer is mounted; and a lower surface of the key. A jack that is rotatably mounted on the hammer roller and that contacts the peripheral surface of the hammer roller to transmit the pressing force of the key to the hammer arm via the hammer roller; and that the jack is disengaged from the hammer roller. A keyboard device having a structure in which a hammer roller and a repetition arm for applying a downward pressing force are stored. A, one end is rotatably supported, and the other end is provided with an elastic biasing force upward by a biasing force of a spring, and the elastic biasing force is applied to a stopper to move downward from a predetermined upper limit position by a predetermined stroke. A key for an electronic keyboard instrument that can rotate to
B, an operation lever portion that is rotatably supported on the lower surface of the key in a posture substantially the same as the rotation surface of the key so as to be a rotation surface, and protrudes downward from the rotation fulcrum; A jack constituted by a sub-lever protruding from a fulcrum in a direction crossing an extension direction of the operation lever;
C, on the frame, at a position displaced slightly from the lower end position of the operation lever portion of the jack toward the pivot point of the key, so that the lower surface of the key has a rotation surface substantially the same as the rotation surface of the key. A hammer arm rotatably supported,
D, a hammer attached to an end of the hammer arm on the pivot fulcrum side of the key;
F, a hammer roller mounted on the hammer arm in a position in which the lower end surface of the operating lever portion of the jack is in contact with the circumferential surface at a position displaced from the rotational fulcrum position of the hammer arm toward the pivot free end of the key. When,
G, an extended portion protruding from the hammer arm and extending from the mounting position of the hammer roller toward the pivot free end of the key;
H, an extension bar protruding downward from the lower surface of the key at the free play end side,
I, a repetition lever rotatably mounted on the extension rod and applying a downward elastic biasing force to the hammer roller;
J, a repetition spring for applying a biasing force for returning the jack to the initial position during the operation of returning the key to the upper limit position;
K, a back check cloth attached to a surface of the extension rod facing the extension of the hammer arm and made of a vibration absorbing material;
A keyboard device characterized by comprising: 3. The keyboard device according to claim 1, wherein a sensor for detecting a swing speed of the hammer is added to a space below the key.

Images