JP2822442B2 - Keyboard device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a keyboard device used for an electronic organ, an electronic piano, a portable keyboard electronic musical instrument, various keyboards, and the like. The present invention relates to a keyboard device provided with a means for accurately displaying a key operation in a musical tone.

[Summary of the Invention]

The present invention is directed to a keyboard device that generates an inductance change corresponding to a displacement amount of a key with respect to a key support member by a key pressing operation, and changes a musical tone control parameter corresponding to the inductance change amount. Then, the opposed area between the inductance change inducing means and the first inductance change detecting means is changed, and the facing distance between the inductance change inducing means and the second inductance change detecting means is changed. By giving different changes, the emotional expression can be made more realistic and rich.

[Conventional technology]

Electronic musical instruments such as electronic organs basically controlled sounding by opening and closing a key switch by pressing a key, but by itself, the sounding characteristics were monotonous, expressing the emotions of a player like a piano. I can't play.

Therefore, various techniques have been developed to provide a so-called touch response function in order to change the sounding characteristics due to the difference in force at the time of key depression and to enable emotional expression.

This touch response function applies a touch control by controlling the volume, pitch, tone color, etc. of the generated musical tone in accordance with the rise of the key and the movement of the player's finger in the sustained state of the sound after the key is pressed. That is.

In order to add such a touch response function,
For example, as shown in Japanese Utility Model Application Laid-Open No. 58-42890, a metal plate is attached to each key as an inductance change inducing means, and a coil is arranged as an inductance change detecting means on the side of the key support member opposite thereto, and the key is pushed. There is a keyboard device provided with a key touch sensor which changes the inductance of the coil by a key operation and takes out the change as a touch output to control a musical tone.

[Problems to be solved by the invention]

However, such a conventional key touch sensor,
Since the metal plate is configured to approach and approach the coil as the key is pressed, the relationship between the key pressing stroke and the electrical output is a higher-order curve, and the input information from the delicate finger at the start of key pressing is the There is a disadvantage that it is difficult to detect because the rate of change is small.

Therefore, according to the above-described conventional technique, the change rate at the end of pressing the key having the largest change rate is detected and output as key pressing speed information.

In order to detect both the information at the start and the end of the key press, it is necessary to convert the input / output characteristics into a substantially linear curve (straight line).

Further, in the above-described conventional key touch sensor, each key has one sensor unit, and a tone control parameter for injecting an emotion based on the detection signal is single and only an initial response. Therefore, there was a problem that expression of emotion was poor.

Further, as disclosed in Japanese Utility Model Publication No. 54-20990 and Japanese Utility Model Application Publication No. 60-125595, there is a type in which a key press signal and an after-control signal after key press are separately output. Not only could not obtain an after-control signal for each key, but the configuration was complicated. Further, if these are developed so that an after-control signal can be obtained for each key, there is a problem that the configuration becomes more and more complicated.

The present invention has been made in view of such a conventional problem, and in a keyboard device having the above-described inductance change inducing means and inductance change detecting means as a touch sensor, a finger → touch sensor → music tone control parameter In the information transmission path, in order to make the emotional expression of the performer more realistic and rich, the key press starts (at the moment when the finger touches the key and starts sinking), and the key press ends, and then the after It is an object of the present invention to provide a keyboard device capable of surely transmitting a player's intention to a musical sound system through a key without difficulty in detecting over a control area.

[Means for solving the problem]

The present invention has the following two features to achieve the above object.

First, each key is provided with an initial touch sensor as an initial touch sensor for outputting an output signal linearly in response to a key stroke.

Second, each key is provided with a second sensing means as an aftertouch sensor.

Further, as a feature of the specific structure, the present invention includes a plurality of keys and a key supporting member movably supporting the keys, and each of the keys and the key supporting member has an inductance change inducing means, On the other hand, an inductance change detecting means is provided in correspondence with each other, and the inductance change detecting means detects a change amount of the inductance according to a displacement amount of the key with respect to the key support member due to a key pressing operation,
In the keyboard device for changing a musical tone control parameter in accordance with the change amount of the inductance, the inductance change detecting means comprises a surface coil pattern, and an area facing the inductance change inducing means changes in response to a key depression operation. The first inductance change detecting means provided on each key or key support member is arranged on each key or key support member such that the distance between the first inductance change detection means and the inductance change inducing means corresponding to the key depression operation changes. And a second inductance change detecting means provided.

The inductance change inducing means of the keyboard device is a metal member having a surface parallel to the key-pressing direction and a surface orthogonal to the key-pressing direction, and each surface coil pattern of the inductance change detecting means is changed to the inductance change inducing means. It is preferable to form the insulating member provided on each surface of the insulating member opposite to each surface of the metal member.

(Operation)

In the keyboard device according to the present invention, the opposing area between the inductance change inducing means and the first inductance change detecting means changes by a key pressing operation for each key, so that the key operation stroke changes substantially linearly. The first detection signal corresponding to the inductance to be changed and the inductance that changes in a quadratic curve with respect to the key operation stroke by changing the facing distance between the inductance change inducing means and the second inductance change detecting means. And a second detection signal (after-control signal).

Therefore, initial control, after-control and the like can be performed by changing the tone control parameter using these detection signals.

In this case, the numerical values of the same type of musical tone control parameter may be used separately for the initial and the after.

For example, when the parameter is set to "volume", volume control (including the after-tremolo effect) can be performed for the initial and the after respectively.

Also, different types of tone control parameter values may be used for the initial and the after.

For example, if the volume is controlled by the initial and the pitch is controlled by the after, the vibrato can be added to the musical sound together with the pitch control of the volume.

Note that the tone control parameters are not limited to the above example.

Moreover, since the first and second inductance change detecting means are each formed of a surface coil pattern, the configuration is simple.

〔Example〕

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

First Embodiment The structure of a keyboard device used in an electronic organ or the like according to a first embodiment of the present invention will be described with reference to FIGS.

FIG. 1 is a partially sectional side view of the keyboard mechanism, and FIG.
The figure is an exploded perspective view.

Reference numeral 1 denotes a white key, which is integrally formed of, for example, a synthetic resin, provided with an engagement projection 1a on the lower surface of the rear end portion, and provided with an L-shaped stopper piece 1b on the lower surface near the key depression portion. Immediately behind this, there is provided a hollow key guide member holding portion 1c having an open lower surface.

Although 1 'is a black key, it is configured in substantially the same manner as the white key 1 except that the key depression portion does not extend toward the front but protrudes upward, so that it is particularly distinguished in the following description. If there is no need, these are collectively referred to as key 1.

On the other hand, reference numeral 2 denotes a keyboard frame (hereinafter simply referred to as a "frame") as a key support member, which is integrally formed by bending each key with an iron plate or the like, and has an engaging projection 1a of the key 1 and a stopper piece 1b. The through holes 2a and 2b into which are respectively inserted are arranged in line corresponding to the mounting positions of the respective keys.

Then, the engaging projection 1a of the key 1 is fitted into the through hole 2a, and the rear end rising portion 2c of the frame 2 is moved by the clip-shaped leaf spring 3.
, The key 1 is pivotally attached to the frame 2 irremovably, and is supported so as to be rotatable about the fulcrum shaft C (FIG. 1).

Further, a leaf spring 4 is engaged between the key 1 and the frame 2 to urge the free end (key pressing part) side of the key 1 upward,
By the upper surface of the bent portion 1b ₁ of a stop piece 1b comes into contact with the upper a stop 5 by like felt that adhered to the lower surface of the frame 2, the upper limit position of the key 1 is restricted.

When the key is pressed, the lower surface of the stopper 1b is
The lower limit of the key 1, that is, the operation stroke, is restricted by contacting the lower limit stopper 6 made of felt or the like attached to the upper surface of the low step portion 2 d bent and formed on the front side of the key 1.

In this way, a large number of white keys 1 and black keys 1 'are supported on the frame 2 in a predetermined arrangement with their top surfaces aligned.

Then, a key guide guide cap 7 as shown in an enlarged manner in FIG. 3 is pressed into the key guide member holding portion 1c of each key 1 and fixedly held therein.

This key guide cap 7 is made of iron (Fe), nickel (N
i) or a non-magnetic metal plate such as aluminum (Al) is formed in a horizontally long rectangular tube shape (box shape) with the lower surface 7a opened, and in the example shown in FIG. A plurality of ventilation holes 7b are provided.

The key guide cap 7 serves both as a key guide member and inductance change inducing means.

On the other hand, on the frame 2, a printed circuit board 8 constituting an oscillation circuit, a signal processing circuit, and the like to be described later is mounted.
In addition, as clearly shown in FIG. 2, a key guide block is provided at a position corresponding to the above-described key guide cap 7 of each key 1.
There are 10 rows.

The key guide block 10 is formed in a rectangular parallelepiped shape by using an insulating member such as a synthetic resin, and is arranged on both sides (front and rear sides in FIG. 3) arranged parallel to the longitudinal direction of the key 1 as shown in FIG. Guide ridges 11 are provided on the front and rear end edges of the front side) over the entire length in the vertical direction.

Normally, as shown in FIG.
Is inserted into the key guide cap 7 only.
At the time of key press and key release, the key guide cap 7
The inner surface parallel to the longitudinal direction of the key 1 has a key guide block 10.
Lightly slidingly contact each guide ridge 11 to guide the vertical movement of the key 1 while restricting the horizontal deflection of the key 1.

A slight gap is provided between the inner surface on the front side (left side in FIG. 1) and the inner surface on the rear side (same right side) of the key guide cap 7 and the front end surface and the rear end surface of the key guide block 10 facing it. When the key 1 rotates from the horizontal state shown by the solid line in FIG. 1 to the lower limit position shown by the imaginary line by the key pressing operation, the key 1 interferes with the key guide block 10 even if the key guide cap 7 is slightly inclined. Without turning, it can rotate smoothly.

As shown in FIG. 3, the key guide block 10 has a pair of surface coil patterns 12a on both side surfaces parallel to the longitudinal direction and the key pressing direction of the key 1, and a front end surface perpendicular to the pair. And a pair of surface coil patterns 12 on the rear end face
As for b, the surface coil patterns 12c are printed and formed as independent coils on the upper surface orthogonal to the key pressing direction (each surface coil pattern is also formed on the opposite surface which is not visible in FIG. 3). .

Therefore, the key guide block 10 also serves as a key guide member and inductance change detecting means, the surface coil patterns 12a and 12b serve as first inductance change detecting means, and the surface coil pattern 12c serves as second inductance change detecting means. It constitutes a detecting means.

When the key guide block 10 is inserted into the key guide cap 7, the coil patterns 12a, 12b, 12
The surfaces on which c is formed face the respective inner surfaces of the key guide cap 7, and the facing area or facing distance is changed by the key press / key release operation.

Since the key guide cap 7 is made of metal, the magnetic permeability of each of the coil patterns 12a, 12b, and 12c is changed according to the amount of change in the opposing area or opposing interval (F
e) In order to generate eddy current (for Al)
The inductance of each surface coil pattern 12a, 12b, 12c as a coil changes.

At this time, the surface coil patterns 12a and 12b, which are the first inductance change detecting means, do not change the distance between the inner surface of the opposing key guide cap 7 due to the key press / key release operation, and have only the opposing area. Since it changes almost linearly, the relationship between the key operation stroke and the change in inductance becomes almost linear. Therefore, a detection signal substantially proportional to the key pressing speed within a unit time can be obtained.

The surface coil pattern 12c, which is the second inductance change detecting means, is regulated by the lower limit stopper 6 without changing the area facing the inner upper surface of the key guide cap 7 which is opposed by the key press / key release operation. Only the interval changes to a certain position, and the relationship between the key operation stroke and the change in inductance becomes a quadratic curve. Therefore, the detection signal greatly changes due to the end of the key press and the pressing of the key after the key is pressed. I do.

The inductance change characteristics of each surface coil pattern will be described in more detail in the following examples.

The surface coil patterns 12a, 12b, and 12c are directly connected to the oscillation circuit on the printed circuit board 8, and are used to change the oscillation frequency by changing the inductance and change the control parameters of the musical tone. , And its utilization circuit will be described later.

Second Embodiment Next, a second embodiment of the present invention in which the structure of the key guide block and the key guide cap in the first embodiment is changed will be described with reference to FIGS.

FIG. 4 is a perspective view of a main part of this embodiment, and shows a key guide cap 27 also serving as an inductance change inducing means and a key guide block 30 fitted into the key guide cap 30 also serving as an inductance change detecting means.

Like the key guide cap 7 of the first embodiment, the key guide cap 27 is formed in a slightly vertically long rectangular cylindrical shape with the lower surface 27a opened by a metal plate such as iron (Fe) or aluminum (Al). , Three vent holes 7b are provided on the front surface.

A lower end edge is slightly expanded to form a flange portion 27c to facilitate insertion of the key guide block 30, and a cushion material 27d such as felt or foam rubber is formed on the inner upper surface.
Is adhered to provide a cushioning material for the key guide block 30 and an elastic material for facilitating after-control after key depression.

On the other hand, the key guide block 30 is constituted by a coil sheet 31 and a coil bobbin 32 as clearly shown in FIG.

The coil sheet 31 is formed by cutting a sheet made of a thermoplastic resin or the like as shown in FIG. 5 (a), so that the coil forming surfaces 31a to 31e and the terminal surfaces 31f, which form the five surfaces of the rectangular cylinder, are developed. Notches 31g are provided at both ends of a connection portion (a bending line shown by a broken line) on each surface to facilitate bending, and a coil sheet support portion 32a of a coil bobbin 32 to be described later.
And the guide ridge 32b can be easily inserted into the gap.

On each of the coil forming surfaces 31a to 31e, for example, a surface coil pattern made of copper foil is formed as an independent coil by a method similar to a wiring pattern of a flexible printed circuit board (FPC).

Then, both ends of each surface coil pattern are appropriately connected through the back surface side, and are led out to a plurality (four in the illustrated example) of through-hole terminals 31h formed on the terminal surface 31f.

As shown in FIGS. 5 (c) and 6, the coil bobbin 32 has a rectangular cylindrical coil sheet support 32 with an open bottom.
And a guide ridge portion 32b projecting in an arrow shape or an angle shape when viewed from above along the ridge portion of each peripheral side surface,
A hollow core 32c formed integrally with an insulating member such as soft vinyl chloride or oil-impregnated rubber and formed of hard plastic is fitted inside the insulating member.

The outer surface of the respective guide protrusions 32b, as best shown in FIG. 7, to enhance the flexibility to form a plurality of pleats 32 b ₁ extending in the vertical direction.

Then, the coil sheet 31 shown in FIG. 5 (a) is heated to some extent to facilitate bending, and is bent into a square tube shape as shown in FIG. 5 (b), and the coil bobbin shown in FIG.
After inserting the coil forming surfaces 31a to 31e from above into the gaps between the guide projections 32b along the coil sheet support portions 32a from above, the terminal surfaces 31f are bent and fixed by bonding or the like, When the temperature is lowered, the shape is maintained as shown in FIG.

Further, the core 32c of the coil bobbin 32 passes through a through-hole terminal 31h formed on the terminal surface 31f of the coil sheet 31.
If a plurality of pins 33 are implanted on the lower end surface of each of the pins and the pins 33 and the through-hole terminals 31h are soldered, the key guide block can be attached to the printed circuit board 8 shown in FIG. The pins 33 can be fixed, and at the same time, the surface coil patterns can be electrically connected to an oscillation circuit described later.

When the key guide block 30 constructed as described above is fitted into the key guide cap 27 attached to the key 1 shown in FIG. 8 in the same manner as in the first embodiment described above, the coil bobbin 32 as shown in FIG. Each guide ridge 32b contacts each inner surface of the key guide cap 27 to guide the key 1 in the vertical direction (Z direction shown in FIG. 8).

However, the space between the key guide block 30 and the key guide cap 27 can change due to the elasticity and the action of the guide ridges 32b of the key guide block 30, so that the key 1 by pressing the key can be changed.
And the key 1 can be slightly moved in the left-right direction and the front-back direction (X direction and Y direction shown in FIG. 8).

For this reason, the attachment portion to the keyboard frame, which is the pivot of the key 1, is preferably made of a flexible material and shape that allows a slight movement in the left-right direction and the front-back direction.

Then, by the displacement of the key 1 in the vertical direction (Z direction),
The facing area between the coil forming surfaces 31b to 31e of the key guide block 30 and the respective inner surfaces of the key guide cap 27 changes, and the distance between the coil forming surface 31a and the inner upper surface of the key guide cap 27 changes.

In addition, the displacement of the key 1 in the left-right direction (X direction) changes the distance between the coil forming surfaces 31d and 31e and the opposing surfaces of the key guide cap 27, and the displacement of the key 1 in the front-rear direction (Y direction). As a result, the coil forming surfaces 31b, 31c and the key guide guide cap 2
The distance between each of the facing surfaces 7 changes.

The inductance of the coil formed on each coil forming surface changes substantially linearly due to the change in the area of the facing surface, and changes in a quadratic curve according to the change in the interval.

The key operation direction and the change in inductance of each coil according to the key operation direction will be described more specifically with reference to FIGS. 9 to 11. FIG.

FIGS. 9 (a) and 9 (b) show key guide blocks 30 respectively.
Each coil forming surface 31a of the coil sheet 31 described above
For the ~ 31e, the position viewed from the front side of the key 1 is displayed in the three-dimensional view and the development view, and the upper, front, rear, right, and left surfaces are respectively designated as A, B, C, D, E surfaces. I do. Z, X, and Y shown in (a) are the eighth
The moving direction of the key 1 is shown as in the figure.

Also, the coils formed on the A, B, C, D, and E planes are
Let a, Lb, Lc, Ld, Le.

FIG. 10 is an explanatory diagram schematically showing the operation direction of the key 1 and the above-described respective surfaces of the key guide block 30, and FIG. 11 is a diagram showing inductance change characteristics of each coil.

Z-direction (key stroke) As shown in FIG. 10 (a), when a key is pressed in the Z-direction, the area facing the key guide cap 27 overlapping the left and right (E, D) surfaces of the key guide block 30 is reduced. Increases almost linearly with stroke.

As a result, the inductances of the coils Le and Ld change as shown in FIG. That is, when the key guide cap 27 is made of iron (Fe), it increases almost linearly according to the stroke, and when it is made of aluminum (Al), it decreases almost linearly.

X direction (key left-right direction) As shown in FIG.
By swinging in the direction, the key guide block 30
D) The distance di, dp between the key guide cap 27 facing the surface is
Subtle (but relatively large) changes.

Therefore, the inductances of the coils Le and Ld change as shown in FIG. 11 (b). This is the case when the key guide cap 27 is made of iron, and has the opposite characteristic when the key guide cap 27 is made of aluminum. This is the same in the following cases.

Y direction (key front-rear direction) As shown in FIG. 10 (c), by pressing the key 1 again and sliding it in the Y direction, the key facing the front (B, C) surface of the key guide block 30 Guide cap 27
The distance ds, dt changes slightly (but at a relatively large rate).

Therefore, the inductances of the coils Lc and Lb change as shown in FIG.

Z direction (after touch) As shown in FIG. 10 (d), the cushion material 27d (FIG. 4) is further pushed in at the end of pushing the key stroke, so that the upper (A) surface of the key guide block 30 and the key The distance dr from the upper surface of the guide cap 27 changes.

As a result, the inductance of the coil La is reduced as shown in FIG.
As shown in FIG. Note that the broken line indicates the change in inductance of the coils Le and Ld in the stroke region.

The change in the inductance of the coil La can be used as a touch signal. It is also possible to connect the coil La in series with the coil Le or Ld and use it as a part of the key stroke signal.

<Oscillator> An oscillator using an LC circuit can be used to extract such a change in inductance of each coil.

FIG. 12 is a circuit diagram showing an example of such a circuit, in which an NPN transistor, capacitors C ₁ and C ₂ , coils L ₁ and L _2, and resistors R ₁ , R ₂ and R ₃
This constitutes an emitter-tuned Hartley oscillator.

In this circuit, the power supply terminal a is grounded and a negative voltage (−V) is applied to b. However, on the balance of the entire circuit, a positive voltage (+ V) is applied to the power supply terminal a and b is grounded. No problem.

The oscillation frequency of this oscillator, that is, the frequency of the signal output from the output terminal OUT is (L ₁ and L ₂ in the above equation represent the inductances of the coils L ₁ and L ₂ ).

Therefore, if the inductance of the coils L ₁ and L ₂ increases, the oscillation frequency decreases, and if the inductance decreases, the oscillation frequency increases.

Therefore, a coil Le formed in the coil sheet 31 of the key guide block 30 described above as the coil L _1, L _2, Ld
(The arrangement is shown schematically in Fig. 13)
As shown in FIG. 11A, when the inductance of the coils Le and Ld increases or decreases in proportion to the keystroke in the Z direction, the oscillation frequency decreases or increases.

For example, the volume can be changed as a tone control parameter depending on the degree of the frequency change of the output signal.

If these coils L ₁ and L ₂ are connected to a coil La formed on the upper surface of the key guide block 30 (the arrangement is schematically shown in FIG. 13) with a midpoint tap, the output of By detecting the frequency change of the signal as an aftertouch signal, it is possible to control various effects of the musical tone by the aftercontrol.

Further, the coils Le or Ld described above are used as the coils L ₁ and L _2.
Can be detected by providing a separate oscillator connected with a center tap to the key, and by separately providing an oscillator connected with the coil Lb or Lc connected to the center tap. An operation in the Y direction can be detected (see FIG. 13).

However, if the detection signals of the key stroke in the Z direction and the after stroke, or the key operation in the X direction or the Y direction are separately extracted, two to four oscillators are required for each key.

Therefore, FIGS. 14 and 15 show circuit examples in which the detection of these key operations is shared by one oscillator. In these figures, only the main part is shown, and the other parts are the same as the circuit in FIG.

FIG. 14 (b) is a coil Lb~Le shown in FIG. 13 as a coil L _1, L ₂ of Figure 12 are connected in series using, it further by connecting the coil La in series, Z-direction This circuit is also used for detecting the key stroke and the after stroke.

FIG. 12B shows that the coils Lc and Ld shown in FIG. 13 are connected as the coils L ₁ and L _{2 in} FIG.
This is a circuit that can detect the key swing in the direction, and can detect the sliding of the key in the Y direction by connecting the coil Lb instead of the coil Le.

FIG. 3C further shows that a coil La is connected in series so that the Z-direction after stroke can be detected.
FIG. 4D shows a circuit in which all the coils La to Le are connected in series and are commonly used for all.

FIGS. 15 (a) to (c) show other circuit examples in which the coils La to Le are connected not only in series but also in parallel, and the operation is almost the same as that of each circuit in FIG. Therefore, the description is omitted.

When an oscillator is provided for each coil, or when two or more oscillators are provided for at least one key, volume control and various effect controls (depth / speed of vibrato, tremolo Depth / speed, pitch fluctuation control,
Chorus effect control, sound spread control [Japanese Patent Application No. 62-140440]
, Etc.) can be performed separately, but in the case of a dual-purpose circuit, either of these controls is performed, or different control parameters are changed depending on the detection timing.

Third Embodiment Next, only the key guide block according to a third embodiment of the present invention will be described with reference to FIGS.

As shown in FIG. 16, the key guide block which also serves as the inductance change detecting means in this embodiment is configured by fitting a resin guide frame 46 to the ridge of the main body 40 formed in a dice shape.

17 (a) to 17 (d) are development views showing different examples of the coil sheet used in this embodiment.

The coil sheet 41 shown in (a) has an upper surface, a front surface, a left surface,
Independent surface coil patterns 41a-4 on the right and rear
1e is formed, and both ends of each surface coil pattern are led to the respective terminals as terminal surfaces 41f on the lower surface.

The coil sheet 42 shown in (b) has independent surface coil patterns 42a, 42b, and 42d formed on the upper surface, the front surface, and the right surface, respectively, and forms one coil by the surface coil pattern 42c that covers the rear surface and the left surface. These terminals are provided on the terminal surface 42f on the lower surface.

The coil sheet 43 shown in (c) has independent surface coil patterns 43a and 43b formed on the upper surface and the right surface, respectively.
Three coils, and these terminals are connected to the terminal surface 43 on the lower surface.
f.

In the coil sheet 44 shown in (d), an independent surface coil pattern 44a is formed only on the upper surface, and one coil is formed by the surface coil pattern 42c extending over the entire circumference of the rear surface, the left surface, the front surface, and the right surface. Each terminal is provided on a lower terminal surface 44f.

The material of each of the coil sheets 41 to 44 and the method of forming the surface coil pattern are the same as those of the coil sheet 31 of the second embodiment.

These coil sheets 41 to 44 are heated to some extent and
As shown in Fig. 18 (a), a cubic coil bobbin 45 bent at each ridge line and molded with resin as an insulating member
After being adhered to the respective surfaces, the main body 40 is cooled, and a guide frame 46 is fitted on the main body 40 as shown in FIG. 16 to complete a key guide block.

If the coil sheet 42, 43 or 44 according to this embodiment is used, this key guide block is mounted on a printed circuit board and viewed from above, and the surface coil patterns 42c, 43c and 44c are seen.
However, as shown in Fig. 18 (b), (c) and (d),
The coil bobbin 45 is formed in an L-shape, a U-shape, or a R-shape over a plurality of surfaces that are at right angles to each other, and the maximum value of the area facing the key guide cap (not shown) can be increased. There is also an advantage that it can be large.

These surface coil patterns have a midpoint tap with
When used as the coils L ₁ and L ₂ of the oscillator shown in FIG. 12, a large frequency change of the output signal can be obtained by the key pressing operation.

Application Circuit Example Next, an application circuit (signal processing circuit) for changing various tone control parameters by changing the inductance of a coil generated in response to a key depression operation by the keyboard device of each of the above-described embodiments. ) Will be described.

<First Circuit Example> FIG. 19 is a block diagram showing a first circuit example.

The feature of this circuit example is to output different touch data corresponding to the key pressing speed or key pressing acceleration, and to control the tone control parameters of the tone signal generating circuit by the touch data. It is intended to control tone control parameters such as sound volume or tone color. In particular, a key pressing speed or a key pressing acceleration control is adopted to enable an initial touch control.

Further, the circuit shown in FIG. 12 which is a basic example is used as the oscillator, and the oscillator 100, the key press detection circuit 110, and the touch data forming circuit 130 of the circuit example shown in FIG. For example, it is possible to realize an electronic keyboard instrument capable of outputting the touch data as initial touch and after touch data, and performing both initial and after control using each means after the multi-circuit 140.

This circuit is roughly divided into an oscillator 100, a key pressing (keying) detecting circuit 110, a key pressing end detecting circuit 120, a touch data forming circuit 130, a multi-circuit 140, a data conversion table 145 and a data selector 146, Music signal generator 15
0 and a sound system 160.

Among these circuits, the oscillator 100, the key press detection circuit 110, the key press end detection circuit 120, and the touch data formation circuit 130
It is provided corresponding to each key of the keyboard device.

The oscillator 100 corresponds to FIG. 12 or FIG.
5 is an oscillator shown in the figure, the counter and the output signal CK ₁
Make 131 input.

In the following description, the key guide cap of each embodiment described above is made of aluminum, and the inductance of the surface coil pattern formed on the key guide block when the key is pressed is the eleventh.
Almost linearly decreases according to the key stroke as shown in the Al of the characteristic curve of FIG. (B), the frequency of the pulse signal CK ₁ output from the oscillator 100 will be described an example in the case of increased accordingly .

For example, when the period of the pulse signal CK ₁ is normally assumed to be relatively long constant value, the period of the pulse signal CK ₁ is shortened in accordance with the stroke as key depression progresses.

The key press detection circuit 110 is a high-speed oscillation circuit 1
11 and the resulting high-speed clock pulse CK
₀ a counter 112 for counting a latch 113 which latches the count value, D type flip-flop circuit for generating a reset signal of the counter 112 (hereinafter simply referred to as "FF") and 114, the Boriyumu VR ₁ Therefore, the preset value setting circuit 115 for manually setting the preset value P1 manually is compared with the A input for inputting the preset value P1 and the B input for inputting the count value latched to the latch circuit 113. When> B, the output is set to "1" and a comparator (CMP) 116 generates a key press signal (key press start signal).

Key depression end detecting circuit 120 includes a Purisetsuto value setting circuit 121 for setting arbitrarily Purisetsuto value P2 at Yotsute manually Boriyumu VR _2, A input and the latch circuit 113 to latch count value to enter the Purisetsuto value P2 And a comparator 122 which compares the input with the B input and sets the output to "1" when A> B to generate a key press end detection signal.

Tatsuchideta forming circuit 130 includes a counter 131 for counting a key operation pulses CK ₁ output from the oscillator 100, the latch 132 to output the latch the count value of the counter 131 inverts the output of the comparator 116 A NOT circuit 133 for providing a reset signal, a differentiating circuit 134 for obtaining a latch signal of the latch circuit 132 from an output signal of the comparator 116, a one-shot multivibrator (hereinafter abbreviated as "OS circuit") 135 and its output. NOT to invert
The circuit and 136, composed of _1, SW ₂ Metropolitan of duplicate changeover switch SW.

Next, the operation of this circuit will be described with reference to FIGS. 20 and 21.

The preset value P1 is usually the pulse signal CK ₁ when no key is pressed.
The count value of the counter 112 at the time of resetting in the cycle of i.e., the maximum value latched by the latch circuit 113 is represented by C
_{If MAX} is set, a slightly smaller value (for example, C _MAX = 1
(At 00, P1 = about 90-95).

On the other hand, the counter 112 when Purisetsuto value P2 is to be reset at a period of the pulse signal CK ₁ at the time of key depression stroke up
Let Cmin be the count value of Cm, that is, the minimum value latched by the latch circuit 113.
When in = 20, set P2 = any value from 21 to 89).

Key depression detecting circuit 110, a short clock pulse CK ₀ of the period counter 112 counts from high-speed oscillation circuit 111, the pulse signal CK ₁ from the oscillator 100 is inputted, the latch circuit 113 the count value C _N at that time latch and output, because the reset signal is the output of the FF114 only be delayed by one cycle of clock pulse CK ₀ becomes "1", starts counting clock pulses CK ₀ again from the counter 112 is reset to "0" I do.

Therefore, when the key is not pressed, the output of the latch circuit 113 is a value close to the maximum value C _MAX , and the preset value setting circuit
Since the preset value P1 is larger than the preset value P1, the input of the comparator 116 is A <B, so that its output is "0".

On the other hand, since the output of the latch circuit 113 serving as the B input is larger than the preset value P2 serving as the A input, the output of the comparator 122 of the key depressing end detection circuit 120 becomes "0" because A> B does not hold. ing.

While the output of the comparator 116 is "0", the output of the NOT circuit 133 becomes "1" and the counter 131 continues to be reset.
Therefore, no touch data is output.

Therefore, the switching switch S of the touch data forming circuit 130
When key depression is started in a state where W ₁ and SW ₂ are switched to the a side as shown in the figure, a pulse signal C input from the oscillator 100 is input.
Since the period T ₁ of the K ₁ is gradually shortened, it latches while the count value C _N of the counter 112 does not become the maximum value C _MAX circuit 113
After latching, the counter 112 is reset.

Then, the count value C _N of the counter 112 is equal to the preset value P.
If the latch circuit 113 is latched before it is smaller than 1, the input of the comparator 116 becomes A> B, and the output thereof becomes "1" as shown in FIG. 20 (a). This rising is a key press signal or a key press start signal.

And I connexion, the output of the NOT circuit 133 becomes "0", for releasing the reset of the counter 131, the counter 131 starts counting of a connexion pulse signal CK ₁ enabled.

At the rising edge of the output of the comparator 116, the differentiating circuit 134 outputs a differential pulse to trigger the OS circuit 135 as shown in FIG. 20 (b), so that the output of the OS circuit becomes as shown in FIG. to "1" from "0" as shown, back to the "0" after a certain period of time T _0.

Because NOT gate 136 inverts the output of the OS circuit 135 as shown in FIG. 2 (d), a predetermined time counter 131 from the start of counting of the pulse signals CK ₁ T ₀ later this NOT circuit 136
Output rises, it is applied to the latch 132 as the latch signal via the changeover switch SW _1. As a result, the latch circuit 132 latches the current count value of the counter 131 and outputs it as touch data.

That is, Tatsuchideta this case, a key depression signal as described above is generated, the counter 131 is located in Lee Western Yalta Tutsi data by the count value in the predetermined time T ₀ from the start of counting of the pulse signals CK ₁ The higher the key displacement speed (key pressing speed), that is, the stronger the key touch, the larger the ratio of the high frequency pulse of the OSC 100 becomes, so that the value becomes large.

On the other hand, when the switching switches SW ₁ and SW ₂ are switched to the b side, the comparator 122 of the key press end detection circuit 120
When the output of the switch rises from “0” to “1”, the latch circuit 13
2 latches the count value of the counter 131 and outputs it as touch data.

That is, when as the key is pressed, the period T ₁ of the pulse signal CK ₁ is shortened, the latch circuit 113 the count value C _N of the counter 112 to latch has decreased less than Purisetsuto value P2 of the key depression end detection circuit 120, As shown in FIG. 20 (e), the output of the comparator 122 becomes "1".

Therefore, the touch data in this case is the counter 13
1 is a count value within a time T from when the counting of the pulse signal CK ₁ is started to when the moving amount of the key reaches a certain value, and the faster the key pressing speed is, regardless of the strength of the key pressing. It becomes a small value.

Key is being the period T ₁ of the pulse signal CK ₁ is increased again return, since the count value C _N, which is latched in the latch circuit 113 increases, first out of the comparator 122 returns to "0", eventually the comparator 116 Also returns to “0”.

As a result, the output of the NOT circuit 133 becomes "1", the counter 131 is reset, and the latch data of the latch circuit 132 is cleared.

Here, by setting the preset value P1 to be slightly smaller than the count value C _MAX of the counter 112 when the key is not pressed, the touch data becomes unstable or malfunctions due to a slight movement at the initial key press or after the key is pressed. Can be prevented.

Further, by setting the preset values P1 and P2 to predetermined values as appropriate, a key pressing start signal can be obtained at any of the key pressing start position and the key pressing intermediate position, and the key pressing middle position or the key pressing end position can be obtained. Select so as to output the key press end signal arbitrarily (however, P1> P2) so that the start of key press is insensitive to the position defined by the preset value P1, and the end of the key is determined by the preset value P2 If the key is pressed deeper than the position where the key is pressed, the input information after that is made insensitive, so that the dead zones are provided at the initial and final stages of the key pressing by the preset values P1 and P2, and each width is set to these widths. It can be freely changed by changing the set value.

With such a configuration, for example, in a keyboard having a hammer as described in Japanese Utility Model Application Laid-Open No. 63-66897 or Japanese Utility Model Application No. 61-41118, the touch sensing means ( Touch feeling of the keyboard provided with 7 and 10) (position suitable for touch sensing);
It is also possible to control the sound or tone parameters according to the sounding position.

For example, in Japanese Utility Model Publication No. 61-41118, a position immediately before or immediately after a click feeling is set to a position at which a key-start signal is emitted by a preset value P1, and an arbitrary position thereafter is set to a preset value P2. Thus, the position at which the key end signal is output can be determined, and in this way, matching between the touch feeling and the touch output can be obtained.

The circuits described above are provided corresponding to each key, and the initial touch data output from the latch circuit 132 of each touch data forming circuit 130 is input to a multi-circuit (multiplexer) 140, and the common From the output line to the data conversion table 145 and the data selector 146 in a time sharing manner.

The data conversion table 145 stores the latch data (initial touch data) output from the multi-circuit 140 in the 21st
As shown in the figure, it is a read-only memory (ROM) storing a table to be converted into data inversely proportional to its size.

Data selector 146, when the select signal S from the changeover switch SW ₂ is "1" to select the input 1, and outputs the data from the multi-circuit, a select input 0 when the select signal is "0" Then, the data from the data conversion table 145 is output.

Therefore, the switching SW ₁ and SW ₂ are switched to the a side,
If the counter 131 has latch 132 and the count value at a predetermined time T ₀ after the start of counting of the pulse signal is output to the multi-circuit 140 and latches the data selector 146 that Lee Western Yalta Tutsi data from the multi-circuit 140 The signal is directly input to the musical tone control circuit 150 via the CPU.

On the other hand, after the switching switches SW ₁ and SW ₂ are switched to the b side and the counter 131 starts counting pulse signals, the output of the comparator 122 of the key press end detection circuit 120 becomes “1”. If the count value is latched by the latch circuit 132 and output to the multi-circuit 140 in the time T up to the time T, the relationship between the size of the initial touch data and the key pressing speed is inversely proportional. The data is converted into data proportional to the key pressing speed by the conversion table 145, and then input to the tone signal generation circuit 150 via the data selector 146.

The tone signal generation circuit 150 generates a tone signal having a pitch corresponding to the key to which the touch data has been input. At this time, the tone level is determined by the value of the touch data input (the attack level and the decay level of the envelope waveform). , Sustain level, release level and time), tone color, pitch fluctuation, tempo, vibrato or tremolo depth and speed, etc., various tone control parameters can be changed in a number of steps. It is possible to generate a tone signal faithfully corresponding to the player's emotional injection based on strength and depth.

Then, the tone signal generated by the tone signal generating circuit 150 is supplied to a sound system 160 including an amplifier 161 and a speaker 162 and the like, and is subjected to electro-acoustic conversion to generate a tone.

It is preferable to provide two sets of circuits for creating such touch data, one for initial touch data creation and one for aftertouch data creation, for each key. Only one or two sets
It may be used in a time-sharing manner for each key.

<Second Circuit Example> Next, a second circuit example using the keyboard device according to the present invention will be described with reference to FIGS. 22 and 23. FIG.

A first feature of this circuit example is that different touch data is output in accordance with a key pressing speed or a key pressing acceleration, and two types of various tone control parameters of a tone signal generating circuit are converted into a single type by the touch data. Touch data creation means (oscillator 100, key press detection circuit 110, touch data formation circuit 230)
It is possible to control with.

The second feature of this circuit example is that the key pressing speed or the key pressing speed when the key pressing speed or the key pressing acceleration exceeds a predetermined value (C value of a change detection circuit 237 described later) after or during key pressing. When the key depression acceleration is detected to generate touch data, key depression is temporarily stopped at any two-dimensional position during key depression or key depression, and key depression or key release or key release is repeated. That is, the key pressing speed or key pressing acceleration at that time is detected and used as touch data.

Thus, for example, the initial control and the after-control of the sound volume can be performed with only the first sensor that changes the facing area between the metal plate and the surface coil pattern and detects the amount of change in the form of speed or acceleration. be able to.

Further, an initial control of the sound volume is performed by the first sensor, the facing distance between the metal plate and the surface coil pattern is changed, and the amount of the change is detected in the form of speed or acceleration by the second sensor. It is also possible to perform after-control of the sound volume (this can be realized by the oscillation circuit shown in FIGS. 12 to 15 and the circuit shown in FIG. 22).

Further, a third feature of this circuit example is that not only the control of all the various parameters (tone, vibrato, pitch, etc.) controlled by the first circuit example but also the output of the touch data creating means is possible. With the touch data, the volume of the keyboard sound or the volume of the rhythm sound can be controlled.

In addition, you can control both.

FIG. 22 is a block circuit diagram showing the first embodiment.
In this circuit example, a portion corresponding to the touch data forming circuit 130 is greatly different, so that the key depressing end detecting circuit 120, the data conversion table 145, and the data selector 146 become unnecessary, and the rhythm sound signal generating circuit 152, the selector 154, and the select switch 156.
Is added.

The other parts are substantially the same as those of the first circuit example shown in FIG. 19, and thus the description thereof is omitted and will not be described in detail. Therefore, the touch data forming circuit 230 will be described.

The touch data forming circuit 230 can form not only initial touch data but also after touch data.

Therefore, the touch data forming circuit 230 includes a counter 231, a latch circuit 232, and a NOT circuit 233 similar to those described above.
Besides, the low-speed oscillator 234, a differentiating circuit that differentiates its output
235, OR circuit 238 for taking the OR of the differential output and the output of NOT circuit 233, and temporarily storing the count value of counter 231 2
A shift register 236 for the stage, a change detecting circuit 237 for detecting a change in the counter value of the counter 231 at regular intervals, and two D-type flip-flop circuits (hereinafter simply referred to as "FF") 239A and 239B. It has.

The change detection circuit 237 calculates a difference | A−B | between the input A (the current count value) from the preceding stage 236a of the shift register 236 and the input B (the previous count value) from the subsequent stage 236b of the shift register 236 as a predetermined value C (C is The output is set to "1" when the value exceeds a small value for preventing malfunction (for example, about 1 to 3). That is, a change in position (movement) of the key is detected.

Further, a divider 240 for calculating the ratio A / B of the input data from each stage 236a, 236b of the shift register 236, and a multiplier 2 for multiplying the output data by the latch data of the latch circuit 232.
41 and a data selector for selecting and outputting one of the multiplication output and the output data of the preceding stage 236a of the shift register 236
It also has 242.

Also in this example, the key guide cap in each embodiment of the keyboard device described above is made of aluminum, and the inductance of each surface coil pattern decreases according to the keystroke,
The higher the frequency of the pulse signal CK ₁ output from the oscillator 100, to explain the action in example where the period T ₁ is shortened.

Although this circuit uses three oscillators,
Set the oscillation frequency of oscillator 100 to ₁ and the oscillation frequency of oscillator 111
₂ , if the oscillation frequency of the oscillator 234 is ₃ , ₂ >
There is a magnitude relation of ₁ > ₃ , ₂ is 1M Hz, ₁ is 10K Hz
(For example, at the position where the key is depressed most), ₃ is of the order of about 100 Hz.

When a key pressing operation is started and the key is pressed down to a predetermined position in the initial stage, the output of the comparator 116 of the key pressing detecting circuit 110 becomes "0" as shown in FIG. Rises to “1”. This is the key press start signal KON ₀
Becomes

In the drawing, KON ₁ indicates a key press start signal for the second key by the key press detection circuit, and KONn indicates a key press start signal for the nth key by the key press detection circuit.

When this signal rises to "1", the output of the NOT circuit 233 falls from "1" to "0" as shown in FIG. 11 (b), the reset state of the counter 231 is released, and the pulse signal CK ₁ At the same time, the reset state of the oscillator 234 is released, so that the oscillator 234 outputs a pulse signal having a constant period as shown in FIG. 23 (c).

Using each rising edge of the pulse signal as a clock, the shift register 236 first stores the count value of the counter 231 (changes as shown in FIG. 23 (e)) in the preceding stage 236a and outputs it. At this time, this shift register 236
Since the latter stage 236b has been previously cleared, its output is "0".

The rising edge of this pulse signal is differentiated by a differentiating circuit 235, and the differentiated pulse shown in FIG. 23 (d) is input to a reset terminal of a counter 231 via an OR circuit 238,
Reset 31.

At this time, the change detection circuit 237 outputs | A−B |
In order to satisfy the condition of> C, the output is set to "1" as shown in FIG.

This becomes the latch signal of the latch circuit 232, and at the same time, the clock signal of the FF239A, 239B. The Q output of the FF239A becomes "1" because its D input is "1".
In the FF239B, since the D input is "0", the Q output remains "0".

Therefore, since the data selector 242 selects the input 0 and outputs it to the latch circuit 232, the latch circuit 232 latches the data of the count value stored in the preceding stage 236a of the shift register 236 as it is, and FIG. ) Is output as level data (initial touch data).

Thereafter, at the next rising timing of the output signal of the oscillator 234, the count value stored in the former stage 236a of the shift register 236 is shifted to the latter stage 236b, and the new count value of the counter 231 is stored in the former stage 236a.

At this time, if the key is moving in the key pressing direction, the new count value should be larger, so that the inputs A and B of the change detection circuit 237 become | A−B |> C. Since the output remains "1", the latch data of the latch circuit 232 does not change, and the states of the FFs 239A and 239B do not change.

Such a state continues until the end of the key pressing stroke, and when the key pressing ends, the count value of the counter 231 for each cycle of the output signal of the oscillator 234 hardly changes, so that the front stage 236a and the rear stage 236b of the shift register 236. Are almost the same and the inputs A and B of the change detection circuit 237 are | A
−B |> C is no longer satisfied, and the output
It returns to "0" as shown in FIG.

This state continues as long as the key is in the normal depressed key position. However, when the key is pressed more strongly by the player, for example, when the cushion material 27d in FIG. As the count value of the counter 231 within a certain time increases, the inputs A and B of the change detection circuit 237 satisfy the condition of | A−B |> C, and the output thereof becomes as shown in FIG. It becomes “1” again.

Further, as another example as shown in FIG. 23 (f), when the key shakes the key sideways from the normal most pressed position, the facing distance between the metal plate and the surface coil pattern is changed, and the change value is changed. (For example, “L ₂ ” in FIG. 12 or “Lb to Le” in FIG. 14) changes, and the count value of the counter 231 within a certain time increases or decreases. The inputs A and B of the change detection circuit 237 satisfy the condition | A−B |> C.

Therefore, a clock signal is given to FF239A, 239B,
At this time, since the D input of 239B is "1", the Q output, that is, the selector control signal becomes "1" as shown in FIG. 23 (g), and the select state of the selector 242 is switched to input 1.

Therefore, the divider 240 is connected to the previous stage 236a of the shift register 236.
And the ratio A / B of the input data A and B from the subsequent stage 236b is calculated, and the data obtained by multiplying the level data output from the latch circuit 232 by the multiplier 241 is output via the selector 242, and the latch Latched to circuit 232.

As a result, the level data output from the latch circuit 232 increases at a rate corresponding to the rate of change of the count value as shown in FIG. 23 (h). This is used as aftertouch data for tone control.

After that, when the key is released and rises and returns, the comparator
Output of 116 returns to “0” (key-off signal), NOT circuit 233
Becomes "1", the counter 231 is reset and the shift register 236 and the latch circuit 232 are cleared.

Therefore, all the parts return to the initial state as shown in FIG.

Such a circuit is provided corresponding to each key, and level data (including initial touch data and after touch data) output from each touch data forming circuit 230 is input to the multi-circuit 140, and each key is input. The signal is sent to the tone signal generating circuit 150 in a time-division manner every time.

In the same manner as described above, various tone control parameters such as the attack level (volume) of the generated tone signal can be controlled in multiple stages using the initial touch data.

Also, after-touch data can be used to perform after-tone control after tone generation, such as multi-step tone control using various parameters such as delay vibrato, tremolo, pitch change, tone color change, and sustain waveform.

According to this circuit, the initial touch data and the after touch data can be detected by a common circuit.

Furthermore, by using a combination of the various surface coil patterns described above as a coil constituting the oscillator 100,
Various complicated and effective sound controls can be realized.

Also, according to the second circuit example, the tone signal generation circuit 15
A rhythm sound signal generation circuit 152 is added in parallel to 0, which corresponds to a keyboard percussion function that has recently been in the limelight, and a bus driver C ₁ is assigned to C ₁ for each key. A rhythm sound source such as tom 1 is assigned to #, and one of the rhythm sounds is generated when one of the keys is pressed.

In order to select the percussion mode in this manner, "2" is selected by the mode selection switch 156. When "1" is selected, the keyboard sound is output from the tone signal generation circuit 150, and when "3" is selected, the data selector 154 switches the data output so that both sound sources are output. Instead of outputting a sound and a rhythm sound, for example, the left half of the keyboard is split and sounded as a keyboard sound and the right half is a rhythm sound.

As described above, according to the present invention, the control by the key also applies to the musical tone control parameter of the rhythm sound, and the touch of the rhythm sound is changed according to the key pressing strength (touch strong → loud volume), and the tone is changed. (Shift from strong touch to include many harmonics), and it is also possible to control both of them by the detection signals of the above-mentioned two sensors held in one key.

Further, when the after-control effect is increased, it is possible to obtain a similar reverberation effect by controlling the percussion sound (attenuation sound) to increase the gain when attenuating.

By the way, in the above-described embodiment, the description has been made mainly on the assumption that the same tone control parameter is controlled by the first and second sensors. However, a specific description will be added as an example of controlling the different tone control parameters. .

A selector control signal to the data selector 242 is added by 1 bit as an input to the multi-circuit 140, and at this input timing, a selecting means (not shown) provided after the multi-circuit 140 is selected, and a latch means (not shown)
If the data is latched and the initial data and the after data are selectively used, two completely different tone control parameters can be controlled.

The latch data may be cleared at the timing when the output KON ₀ of the key press detection circuit falls (output b).

According to such a configuration, for example, the volume can be controlled by the initial touch, and the subsequent tone can be controlled by the after touch. It is also possible to control the so-called attack pitch effect (initial pitch is changed in accordance with the touch data), in which the initial pitch is pronounced higher than the original pitch in the initial touch, and then to the original pitch, and the vibrato depth can be controlled by the after touch.

In this case, it is needless to say that the vibrato speed can also be controlled with the key after-control period.

Further, all functions equivalent to those of the first and second circuit examples described above or their application circuits can be realized by program processing using a micro computer.

The present invention can be applied not only to a normal keyboard electronic musical instrument but also to a keyboard, a push button type keyboard, or a pedal keyboard of various portable electronic musical instruments, and further to an expression pedal device, a knee lever device and the like.

〔The invention's effect〕

As described above, according to the present invention, in a keyboard device provided with an inductance change inducing means and an inductance change detecting means as a touch sensor, each key has a simple configuration using a surface coil pattern as an inductance change detecting means. A plurality of inductance change detection signals having different characteristics are obtained according to the key depression operation, and the signals are used as, for example, initial touch data and after touch data, and the control parameters of different musical sounds are arbitrarily changed to perform initial control. And after control can be performed, thereby enabling a performance in which the emotional expression of the player is realistically and richly injected.

[Brief description of the drawings]

1 is a side sectional view showing a keyboard mechanism according to a first embodiment of the present invention, partially cut away, FIG. 2 is an exploded perspective view thereof, and FIG. 3 is a perspective view of a key guide cap and a key guide block. 4 is a perspective view of a key guide block and a key guide cap according to a second embodiment of the present invention, FIG. 5 is an assembled view of the key guide block, and FIG. 6 is a key guide cap of the key guide block. 7 is a cross-sectional view showing a part of FIG. 6 in an enlarged manner, and FIG. 8 is the same key guide block and key guide cap attached to a printed circuit board and a key, respectively. FIG. 9 is a layout view of each coil forming surface of the coil sheet in the key guide block, and FIGS. 10A to 10D are explanatory views showing different examples of key operations, respectively. Fig. 11 (a) to (d) Each FIG. 10 (a) to (d)
FIG. 12 is a circuit diagram showing an example of an oscillator using the same coil, and FIG. 13 is a circuit diagram showing an example of an oscillator using the coil. FIG. 13 is a diagram showing a key guide block according to a second embodiment of the present invention. 14 and 15 are circuit diagrams of main parts of an application example in which the connection of the coil of the oscillator shown in FIG. 12 is changed, and FIG. 16 is a key diagram of a third embodiment of the present invention. 17 (a) to 17 (d) are exploded views showing different examples of the coil sheet, and FIG. 18 (a) is also in the process of attaching the coil sheet to the coil bobbin. 17 (b) to (d) are views from above of a surface coil pattern portion over a plurality of surfaces when the coil sheet of FIGS. 17 (b) to (d) is attached to a coil bobbin. FIG. 19 is a schematic diagram showing First to utilize the keyboard device
FIG. 20 is a timing chart of output signals of respective parts for explaining the operation of the circuit example, FIG. 21 is a diagram showing conversion characteristics of the data conversion table in FIG. 19, and FIG. Second embodiment for using the keyboard device according to the present invention
FIG. 23 is a timing chart of output signals of respective parts for explaining the operation of the touch data forming circuit. 1, 1 ': white key and black key (key), 2: keyboard frame 7: key guide cap, 8: printed board 10: key guide block, 11: guide ridges 12a to 12c Surface coil pattern 27 Key guide cap 30 Key guide block 31 Coil sheets 31a to 31e Coil forming surface 31f Terminal surface 32 Coil bobbin 32a Coil sheet support 32b Guide Ridge, 33 Pin 40 Key guide block body 41-44 Coil sheet 45 Coil bobbin 46 Guide frame 100 Oscillator 110 Key press detection circuit 120 End of key press Detector circuits 130 and 230 Touch data forming circuit 140 Multi-circuit 145 Data conversion table 146 Data selector 150 Music signal generating circuit 160 Sound system

Continuation of the front page (56) References Japanese Utility Model Showa 57-23595 (JP, U) Japanese Utility Model Showa 58-42890 (JP, U) Special Table 1-500694 (JP, A) (58) Fields surveyed (Int) .Cl. ⁶ , DB name) G10H 1/34

Claims (2)

(57) [Claims] A key supporting member for movably supporting each key; an inductance change inducing means for one of the keys and the key supporting member; and an inductance change detecting means for the other. The inductance change detecting means detects a change in inductance according to a displacement of the key with respect to the key support member due to a key pressing operation, and a tone control parameter corresponding to the change in inductance. Wherein the inductance change detecting means comprises a surface coil pattern, and each of the keys or the key support members is changed so that an area facing the inductance change inducing means changes in response to a key depression operation. A first inductance change detecting means disposed in Keyboard and wherein said that it has been Manzanillo connexion configuration and a second inductance change detection means provided in each of the key or key supporting member as opposed interval varies with. 2. The keyboard device according to claim 1, wherein the inductance change inducing means is a metal member having a surface parallel to the key pressing direction and a surface orthogonal to the key pressing direction. The surface coil pattern is
A keyboard device, wherein an insulating member provided corresponding to the inductance change inducing means is formed on each surface facing each surface of the metal member.