JPS6224309Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a keyboard device for an electronic musical instrument having a key mechanism including groups of different keys.

Electronic musical instruments such as electronic organs are equipped with multiple keys corresponding to each pitch, and by playing these keys in time with the music, the key switch corresponding to the pressed key is operated. and is configured to electrically generate musical tones. FIG. 1 shows an example of a keyboard device used in this type of electronic musical instrument, in which a protrusion 2 integrally protruding from the rear end 1a of a key 1 is folded upward from the rear end of a frame 3. The key is inserted into the hole 5 of the bent support plate 4, and the recess 6 formed at the base of the protrusion 2 is engaged with the upper edge of the hole 5, and the key is inserted between the key 1 and the frame 3 for key return. By constantly biasing the key 1 upward through the interposition of the spring 7, the key 1 is rotatably supported using the recess 6 as a pivot point. The key 1 is integrally equipped with an actuator 8 and a substantially hook-shaped stopper 9 vertically disposed on its lower surface, and by engaging the tip of the stopper 9 into a hole 10 formed in the frame 3, a small Angular rotation is allowed and the key is normally held almost horizontally, and when the key is pressed, it rotates counterclockwise and descends against the spring 7, causing the actuator 8 to operate the key switch 11 and hold it. The key 1 is configured to electrically generate a musical tone corresponding to the key 1. Note that when the pressing force is released, the key 1 rotates back to the original position shown in the figure by the force of the spring 7.

By the way, in such a conventional keyboard device, as the key 1 is pressed down, the reaction force applied by the fingertip increases due to the action of the spring 7, so the touch feeling of the key 1 is significantly different from the keys of a general piano, electric piano, or pipe organ. are doing. Therefore, for example, even if one wanted to play a certain piece of music with a tone similar to that of a piano, the tactile feel of an electronic musical instrument was inconvenient, and the performer's feelings were unsatisfied.

This idea was made in view of the above points,
To provide a keyboard device for an electronic musical instrument in which at least two types of key touch sensations are obtained by dividing a plurality of keys into at least two key groups and changing the key mechanisms of these key groups.

This invention will be described in detail below based on embodiments shown in the drawings.

Fig. 2 is a perspective view of an embodiment of an electronic musical instrument equipped with a keyboard device according to the present invention, and Fig. 3 is a longitudinal sectional view of the same instrument. In these figures, an electronic musical instrument 20 has an instrument case 21 with the front half of the top surface open, and a keyboard section 23 is formed by arranging a plurality of keys 22 corresponding to each pitch in two rows, upper and lower, in the open part of the instrument case 21. In this case, the lower row of keys 22A and the upper row of keys 22B have different key mechanisms 24, 25.

That is, the key touch mechanism 2 of the lower key group 22A
Reference numeral 4 has a structure similar to the key touch mechanism of a general piano, and includes a keyboard reed gable 26 and a reed back 27 fixed to the inner bottom surface 21a of the instrument housing 21, and a key touch mechanism fixed on the keyboard reed gable 26. Takomae 28 and Yokochu 2
9, an oval key pin 30 and a balance key pin 31 implanted on the front of the reed 28 and the middle of the reed 29, respectively, and a weight 33 fixed to the upper surface of the rear end of the key body 32. By passing through a fan-shaped hole 34 formed in the approximate center of the key body 32, the key body 32 is supported so as to be able to freely rotate (swing) in the vertical direction using the lower end opening of the hole 34 as a rotation fulcrum. , the upper end of the oval keeping 30 forms a recess 35 provided on the lower surface of the front end of the key body 32.
By constantly engaging the key body 32, the key body 32 is positioned in the left-right direction and horizontal vibration is prevented. The key body 32 maintains its initial position by having its front end floating upward as shown in the figure due to the weight 33, and its rear end being locked by the descending reed rear 27. When the key is rotated and lowered by a pressing operation, a key switch (not shown) provided at the rear end of the key is operated, and a musical tone corresponding to the key is electrically generated.
The weight 33 is set to a predetermined weight and is used to increase the speed of the key body 32 at the drive position of the key switch by its inertia when it rises with a key press operation.
This gives the key body 32 a predetermined key touch feeling, that is, a key touch feeling similar to that of a piano. In this case, it is sufficient that the key body 32 has a tactile feel similar to that of a piano key, so instead of using only the weight 33, the key body 32 can be moved using an action mechanism used in solid pianos or grand pianos. A mechanism may also be configured.

On the other hand, the key mechanism 25 of the upper key group 22B is
It is constructed almost the same as the keyboard device shown in the figure. That is, the rear end portions are respectively inserted and locked into the holes 5 of the vertical piece portion 4 provided integrally with the rear end portion of the frame 3, thereby forming a recess 6 in the rear end portion.
It is supported so as to be freely rotatable in the vertical direction using the rotation fulcrum, and is always given a clockwise return behavior in the drawings by a coil spring 7. Also, key 1
is equipped with a hook-shaped engaging piece 9 vertically installed near the front end of its lower surface, and by engaging this into a hole 10 drilled in the frame 3, a small angle with respect to the vertical direction is provided. Rotation is allowed. Further, each key 1 is provided with an actuator 8 vertically disposed approximately at the center of its lower surface, and a key switch 11 is fixed to the lower surface of the frame 3 in correspondence with the actuator 8. Therefore, when key 1 is pressed,
The actuator 8 of the key 1 is lowered together to operate the key switch 11 corresponding to the key 1 to generate a musical tone like the key 1.

With this configuration, the upper key group 22B provides the same key touch feeling as a conventional electronic musical instrument, and the lower key group 22A provides the same touch feeling as a piano key, so that one electronic musical instrument can It gives you the feeling of touching two keys, allowing you to play a wide range of musical instruments.

FIG. 4 is a longitudinal sectional view showing another embodiment of this invention. In this embodiment, the key mechanism 25 shown in FIGS. 2 and 3 is configured to provide a key touch feeling similar to that of a pipe organ, and the spring force of the spring 7 is made very weak, and the torsion coil spring is used. 4
The difference from the previous embodiment is that 0 is provided. That is, the spring 7 is used simply to return the key body 1 which has been rotated and lowered by the pressing operation to its original position, and its elastic force is set to be very weak compared to conventional springs. On the other hand, the torsion coil spring 4
0, a support plate 41 is integrally hung approximately at the center of the bottom of the key body 1, and a pin 42 is attached to the lower end of the support plate 41.
are being planted. In addition, the frame 3 has a support plate 4.
A through hole 43 is bored at a position corresponding to 1,
The support plate 41 can be inserted freely. A pin 44 is installed in parallel to the pin 42 on one side of the through hole 43 . And pin 4
2 is normally located diagonally above the pin 44 by a predetermined height h. The torsion coil spring 40 has both ends rotatably supported by pins 42 and 44, respectively, and is arranged so that the circular coil portion 40a passes through the through hole 43 and is located below the frame 3. ing. This torsion coil spring 40 is used to give the key body 1 a predetermined touch feeling, that is, a key touch feeling similar to that of a pipe organ, and is set to a predetermined tension. It should be noted that since the other configurations are the same as those of the keyboard device shown in FIGS. 2 and 3, the same components are designated by the same reference numerals and their explanations will be omitted.

In the key mechanism 25 having such a configuration, when the key body 1 is not pressed, the stopper 9
By contacting the upper edge of the hole 10, the key body 1
is held substantially horizontally as shown in FIG. At this time, a force F as shown in FIG. 5a is applied to the pin 42, in other words, to the key body 1 by the torsion coil spring 40. Note that F ₁ and F ₂ are the vertical and horizontal components of the force F.

When the key body 1 is pressed down in this state, the key body 1 rotates counterclockwise in FIG. 4, and the support plate 41 moves downward. Therefore, the pin 42 also lowers together, and the relative height h with respect to the pin 44 becomes smaller as shown in FIG. 5b, and as this height h becomes smaller, the force F increases.
The vertical component of force F ₁ decreases to F′ ₁ , and the horizontal component F ₂
increases to F′ ₂ . Then, the key body 1 is further pressed down and the relative height h becomes 0, as shown in FIG. 5c.
That is, when the pin 42 reaches the same height h as the pin 44, the vertical component force becomes 0 and only the horizontal component force _F''2 remains.At this time, the horizontal component force _F''2 becomes maximum. The key body 1 is further pressed down and the pin 4 is released as shown in FIG. 5d.
2 is at a position lower than the pin 44, the vertical component becomes -F ₁ and the horizontal component becomes F ₂ . That is, the direction of the vertical component _-F1 is opposite to that before. Therefore, if the key body 1 is pressed down continuously, the key body 1 will feel a slight click at this time. And the horizontal component force _F2 is
F″ is smaller than ₂ , and key body 1 has a vector F
A force represented by is applied.

The forces that affect the depression of the key body 1 are the vertical component forces F ₁ to -F ₁ , and the horizontal components F ₂ to _{F 2} have no influence at all. And this vertical component force F ₁ ~ -F ₁ is shown in Figure 5 a ~ d
As is clear from the figure, it decreases as the key body 1 is pressed down. The load-stroke characteristics of the key body 1 are shown in FIG. 6 as a characteristic curve, and this characteristic curve is extremely similar to the characteristic curve of a pipe organ. Therefore, the upper key group 2
2B can provide a key touch feeling similar to that of a pipe organ, which is different from the above-mentioned lower key group 22A, which has a key touch feeling similar to that of a piano.

When the pressing force of the key body 1 is released, the elastic force of the spring 7 when the key is pressed is designed to be larger than the magnitude (strength) of the vector _-F1 of the torsion coil spring 40, so that the elastic force of the spring 7 increases. The restoring force overcomes the non-returning force of the torsion coil spring 40, and the key body 1 returns to its original state, and the characteristics at this time are represented by the characteristic curve shown in FIG.

In addition, the characteristic value when the key is pressed is 7 spring compared to the time when the key is returned.
The value is large as it resists the spring force.

In addition to the above-mentioned torsion coil spring 40, a V-shaped spring 50 as shown in FIGS.
Alternatively, it is also possible to use a tension coil spring 51. In addition, if you want to mainly give a click feeling to the key body 1, a cam mechanism by the same applicant,
Various key touch mechanisms using leaf springs, magnets, etc.
45-58779).

FIG. 8 is a longitudinal sectional view showing still another embodiment of this invention. In this embodiment, instead of the piano-like key mechanism 24 shown in FIG. 4, the lower key group 22A is constructed with a key mechanism 55 that is substantially the same as the keyboard device in the conventional electronic musical instrument shown in FIG. This embodiment differs from the previous embodiment in this point. That is, this key mechanism 55 is
Support plate 5 rotatably supports the rear end of the key body 56
7, and a spring 58 that gives the key body 56 a return habit.
and a stopper 59 that engages in the hole 60 to restrict rotation of the key body 56.The load-stroke characteristic of the key body 56 is represented by a straight line in FIG. Note that the other configurations are the same as those of the above-mentioned embodiments, and therefore their explanations will be omitted.

FIG. 9 is a perspective view showing still another embodiment of this invention. In this embodiment, instead of the key mechanism 25 shown in FIGS. 2 and 3, the upper key group 22B is configured to generate musical tones by driving a switch (not shown) using a plurality of push buttons 70. Unlike each embodiment, other configurations are the same, so explanations thereof will be omitted.

In addition, although each of the above embodiments has been described in the case where the upper and lower two-stage key groups are configured with different key mechanisms, this invention is not limited to these, and can also be applied to three-stage keyboards and four-stage keyboards. In addition, various changes are possible, such as dividing the keys of a certain stage in the center into left and right key groups, and making the key mechanisms of these key groups different.

As explained above, according to the keyboard device for an electronic musical instrument according to this invention, a plurality of keys are divided into at least two key groups and the key mechanisms are different. You can feel the touch of the keys, and enjoy playing in harmony with the song. It also has excellent effects, such as being able to change the timbre that matches the music and the touch feel of the keys to suit the performance.

[Brief explanation of the drawing]

FIG. 1 is a vertical sectional view showing an example of a conventional keyboard device for an electronic musical instrument, FIG. 2 is a perspective view showing an embodiment of an electronic musical instrument equipped with the keyboard device according to this invention, and FIG. FIG. 4 is a longitudinal sectional view showing another embodiment of the invention; FIG. 5 is an explanatory diagram of the operation of the keyboard device shown in FIG. 4; FIG. 6 is a graph showing the keystroke characteristic curve; 9 to 9 show still another embodiment of this invention, in which FIG. 7 is a sectional view of a main part, FIG. 8 is a longitudinal sectional view, and FIG. 9 is a perspective view. 3... Frame, 4... Support plate, 7... Return spring, 8... Actuator, 11... Key switch, 20... Electronic musical instrument, 22... Key, 22A...
Lower key group, 22B...Upper key group, 24, 25
...Key mechanism, 31...Balance key pin, 33...
... Weight, 55 ... Key mechanism, 57 ... Support plate, 58
...Return spring, 59...Stopper, 70...Push button.

Claims (1)

[Claims for Utility Model Registration] (1) An electronic musical instrument comprising at least two groups of keys, each of which has a different key mechanism, each of which operates a key switch when pressed. keyboard device. (2) Utility model registration claim 1, characterized in that the different key mechanisms are key touch mechanisms.
A keyboard device for an electronic musical instrument as described in . (3) The key touch mechanism of one key group consists of a support plate that rotatably supports the rear end of the key, a spring that gives the key a return habit, and a stopper that restricts the rotation range of the key. , the electronic musical instrument according to claim 2, wherein the key touch mechanism of the other key group has a member or mechanism disposed at the rear end of the key to accelerate the downward movement of the key. keyboard device. (4) The key touch mechanism of one key group consists of a support plate that rotatably supports the rear end of the key, a spring that gives the key a return habit, and a stopper that restricts the rotation range of the key. , the key touch mechanism of the other key group consists of a member or mechanism that gives a click feeling to the key, Claim 2 of the utility model registration
A keyboard device for an electronic musical instrument as described in . (5) The keyboard device for an electronic musical instrument according to any one of claims 1 to 4 of the utility model registration claim, wherein the key of the key mechanism of at least one key group is a push button.