JPS6224317Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a scale signal generating device that can generate a scale signal to which effects such as vibrato are added.

(Problems to be solved by conventional techniques and inventions) A general scale signal generating device generates a scale signal by opening the gate of a gate circuit corresponding to a keyboard key switch that is closed by a key press. However, in the conventional device of this kind, several sets of keyboard keyswitches are housed below the keyboard a in a switch case b, as shown in Figure 1, while the gate circuit c is located behind the keyboard a inside the electronic keyboard instrument. It was provided on a wiring board d attached to a shelf board or the like using a support. Therefore, at least as many lead wires f are required to connect the output terminal e of the keyboard key switch and the gate circuit c as there are keys a, and the wiring is labor-intensive and the large number of lead wires f prevents breakdowns due to disconnection, incorrect wiring, etc. Frequently.

Furthermore, since the switch case b is located below the keyboard a, it is not possible to arrange the gate circuit c and other necessary circuits under the case b.

In addition, in order to obtain effects such as vibrato, a keyboard key switch is provided with two normally open contacts, and the first normally open contact, which is closed first when a key is pressed, is used to generate a scale signal, and when a key is subsequently pressed, the first normally open contact is used to generate a scale signal. The second normally open contact, which is closed by , was used to generate the effect.

Therefore, the closing timing of the two normally open contacts must be properly adjusted, the structure of the keyboard key switch becomes complicated, and there are problems in that there are many failures.

An object of the present invention is to provide a scale signal generating device that eliminates the above-mentioned conventional problems.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a reflective surface on the lower surface of each of the plurality of keys, and provides a reflective surface at a position opposite to the reflective surface and responds to the pressing of the key. and the distance to the reflecting surface changes.
In a scale signal generating device in which a coupler is arranged, when the key is pressed down a certain distance, an output corresponding to the pressing distance obtained from the photo coupler,
Generates a scale signal corresponding to the pressed key, and outputs corresponding to the pressing distance obtained from the photocoupler when the key is pressed following the pressing of the key,
It is characterized in that it is configured to add effects such as vibrato to the scale signal corresponding to the pressed key.

(Example) Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 3 shows one embodiment of the present invention.

The keyboard 8 is constructed in the same manner as the conventional one except that there is no keyboard key switch, and the key 10 is provided with a leaf spring 11.
It is connected to the chassis 9 by. white key 10-
A reflective surface 2, such as a synthetic resin plate, is fixed to the lower surface of the switch presser 12 provided on the W and black keys 10-B instead of the conventionally used switch presser felt. Further, a wiring board 5 is provided in which a photo coupler 3 is disposed at a position facing the reflective surface 2, and a gate circuit 4 is disposed around the photo coupler 3.

In addition, a stopper rail 13 having a U-shaped cross section is fixed to the chassis so that the key 10 is always located between the upper limit and the lower limit. An elastic member 16 fixed to the lower part of the key 10, for example, a plate-shaped neoprene rubber, is brought into contact with the upper inner wall surface 15 of the stopper rail 13, and the key 10 is further strongly pressed. When pressed, the elastic member 16 is compressed so that the reflective surface 2 provided on the lower surface 18 of the switch holder 12 comes very close to the photo coupler 3. That is,
The keyboard is composed of a two-stage touch mechanism.

Note that it is not necessary to use a conventional switch presser 12, and a conventional switch presser felt may be used as the elastic member 16.

The photo coupler 3 is connected to the reflective surface 2 as described above.
Since it is installed in a position opposite to the
As shown in FIG. 2, the light emitted from the light emitting element 6 of the photocoupler 3 is reflected by the reflecting surface 2 and received by the light receiving element 7. Thus, when the key 10 is pressed down and the distance between the reflective surface and the photo coupler 3 changes, an output current corresponding to the distance is obtained as shown in FIG. 2B.

FIG. 4 shows a modification of the one shown in FIG.

In this modification, photo couplers 3 are disposed inside the white key 10-W and the black key 10-B at different heights, and the upper inner wall surface 19 of the black key 10-B is
is provided with a reflective surface 2 made of a white synthetic resin plate. The upper inner wall surface of the white key 10-W is used as the reflective surface 2.

The light emitted from the light emitting element 6 of the photo coupler 3 is reflected by the reflecting surface 2 and received by the light receiving element 7,
An output corresponding to the amount of received light is obtained from the terminal of the resistor 20.

The key 10 is attached to the electronic keyboard instrument having the configuration shown in FIGS. 3 and 4, and the elastic member 16 fixed to the lower part of the key 10
When pressed until it touches the white key 10-W, the distance between the upper inner wall surface of the white key 10-W and the photo coupler 3 and the black key 10
- Reflective surface 2 provided on the upper inner wall surface of B
The distance to the photo coupler 3 changes, and as a result, the output current from the photo coupler 3 changes significantly. This change in output current is extracted as a change in voltage, and this voltage opens the gate circuit 4, which It can generate scale signals in the same way as contacts.

FIG. 5 shows an embodiment of the present invention, which generates a scale signal and adds a vibrato effect or glide effect to the scale signal.

In the same figure, the output OUT1 of photo coupler 3
OUTn is each comparator (comparison circuit) 51
are connected to the gate terminals GATE1 to GATEn of a scale signal gate circuit (not shown) through the gate circuit, and connected to the vibrato terminal 34 of the main oscillator 33 of the electronic keyboard instrument through the OR circuit 30, buffer 31, and gate circuit 32. has been done.

The comparator 51 is connected to an elastic member 16 fixed to the lower surface of the key 10 by pressing down on one of the keys 10.
When the gate contacts the upper outer wall surface 17 of the stopper rail 13, a gate open signal is output, and the gate circuit 3
2 is opened when the comparator 51 outputs a gate open signal. Reference numeral 35 denotes a gate circuit. The gate circuit 35 is connected to the comparator 51 via an inverter 52, and the gate is normally open and closed when the comparator 51 outputs a gate open signal.

Thus, when the key 10 is pressed down until the lower elastic member 16 of the key 10 comes into contact with the upper outer wall surface 17 of the stopper rail 13, the key 10 is pressed in the first step.
The output of the photo coupler 3 corresponding to the pressed position 0 is directly applied to the vibrato terminal 34 of the main oscillator 33, and oscillation at the same predetermined frequency as when the gate of the gate circuit 35 is opened without pressing the key is performed. It will be done. When the pressing force of the key 10 is further increased (second key pressing), the elastic member 16 is compressed, and the distance between the key 10 removed and the photo coupler 3 becomes extremely close, and as a result, the output of the photo coupler 3 decreases. It becomes even larger and is applied to the vibrato terminal 34 of the main oscillator 33,
A glide effect is obtained in which the oscillation frequency of the main oscillator 33 changes continuously.

A vibrato effect can be obtained by moving the key 10 in small steps during the second key press.

Note that 50 in FIG. 5 is a vibrato switch, and this switch 50 is connected to a vibrato oscillator (not shown). FIG. 6 shows a circuit according to an embodiment of the present invention, which generates a scale signal and adds to the scale signal an effect according to the speed at which a key is pressed, that is, a touch response effect.

In the same figure, the output OUT1 of photo coupler 3
-OUTn are respectively connected to two comparison circuits 40 and 41 having different set values, and the output of the comparison circuit 40 is connected to the control pole of the transistor 44, and the output of the comparison circuit 41 is connected to the control pole of the transistor 45. The comparator circuit 40 has a smaller output voltage of the photocoupler 3 than the comparator circuit 41 and the transistor 44
is starting to open up.

When the key 10 is pressed in this way, first, the comparison circuit 4
0 operates on the output of photocoupler 3 to open transistor 44, so capacitor 42 is charged. When pressed further, the comparator circuit 41 operates and opens the transistor 45, so the capacitor 4
The charged voltage of 2 is discharged and applied to a gate 43 of a scale signal gate circuit (not shown).

The voltage applied to the gate 43 is the voltage applied to the comparator circuit 40
It is determined by the time from the activation of the comparator circuit 41 to the activation of the comparator circuit 41, that is, the discharge time of the capacitor 42 into the resistor 46.

Therefore, a scale tone, that is, a touch response effect corresponding to the speed at which the key 10 is pressed can be obtained.

(Effects of the invention) As explained above, according to the invention, it is possible to generate a scale signal corresponding to a key by simply arranging a photocoupler corresponding to each key, and to add effects such as vibrato to the scale signal. It has the advantage of having a simpler configuration, less troublesome adjustment, and fewer failures than conventional ones.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a conventional scale signal generator, Fig. 2 A and B are principle diagrams and characteristic diagrams of a photo coupler, Fig. 3 is a perspective view of an embodiment of the present invention, and Fig. 4 is a perspective view of the present invention. 5 and 6 are circuit diagrams of the embodiment of the present invention, respectively. 1... Lower surface of the keyboard, 2... Reflective surface, 3... Photo coupler, 4... Gate circuit, 5... Wiring board.

Claims (1)

[Scope of utility model registration request] A scale signal generating device, in which a reflective surface is provided on the lower surface of each of a plurality of keys, and a photo coupler is arranged at a position opposite to the reflective surface so that the distance from the reflective surface changes according to the depression of the key. When the key is pressed a certain distance, an output corresponding to the pressing distance obtained from the photocoupler generates a scale signal corresponding to the pressed key, and a scale signal obtained from the photocoupler when the key is pressed subsequent to the pressing of the key. A scale signal generating device characterized in that it is configured to add an effect such as vibrato to a scale signal corresponding to a pressed key by an output corresponding to a pressing distance.