JPH06176663A - Electronic musical instrument - Google Patents

Abstract

PURPOSE:To make easy installation to a musical instrument main body and the adjustment and to provide an improved maintenance property by forming a key switch, control switch and their conductor patterns on a common flexible sheet base. CONSTITUTION:The key switch sheet portion 3a of a flexible sheet base 3 is inserted between inverted-L resin guides L1, L2 located in the gap between the key 2a, 2b of a keyboard portion 2 and a keyboard frame 2c and is integrated therewith, with a stepped level portion 3a flatly extended. The keyboard portion 2 is fitted into the opening 1b of an upper case 1 in which various controllers and speakers are incorporated. The key switch sheet portion 3a is locked to the frame 2c by means of screws or the like. A holding plate 4 is pressed to a panel switch she portion 3b from below and secured thereto by means of screws or the like. Each key switch portion and each control switch portion are connected to the respective portions of an instrument main body side main circuit via a connector terminal 3e. Finally, a lower case 5 is fitted to complete assembly of the musical instrument. It is thus made easy to mount and remove and maintain the switch sheet portion 3a.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic musical instrument such as an electronic organ or an electronic piano having a keyboard portion composed of a plurality of keys.

[0002]

2. Description of the Related Art Conventionally, as this kind of electronic musical instrument, for example, there is one shown in Japanese Patent Laid-Open No. 59-61887.

In this, a supporting piece for supporting the rear end of the keyboard as a fulcrum is made to project slightly above the upper surface of the keyboard, and the protruding supporting piece has various operating elements provided behind the keyboard. The front end face of the panel is made to abut, and the keyboard side switch section and the panel side switch section are formed separately.

[0004]

However, in such a conventional electronic musical instrument, the key switch section corresponding to each key and the panel switch section corresponding to each operator are provided on separate printed circuit boards. As a result, it was troublesome to assemble it to the instrument body, and it was difficult to adjust the circuit between each printed circuit board, there was a problem in maintainability, and the circuit configuration was extremely complicated.

It is an object of the present invention to make it easy to assemble and adjust the musical instrument body, improve maintainability, and simplify the circuit structure.

[0006]

In order to achieve the above object, the present invention provides a predetermined step difference between a keyboard circuit section of a keyboard having a plurality of keys and a panel circuit section of a panel having a plurality of operators. In the arranged electronic musical instrument, a key switch provided corresponding to each key, an operator switch provided corresponding to each operator, and a conductor wire pattern thereof are provided at a step portion corresponding to the step. The present invention provides an electronic musical instrument formed on a common sheet substrate having flexibility capable of forming

[0007]

By configuring the electronic musical instrument according to the present invention as described above, the key switch and the operator switch can be mechanically and circuitically formed on a single sheet substrate, and the electronic musical instrument main body can be formed. Assembling and adjustment and maintenance after assembling are easy, and it is not necessary to divide the conductor pattern part into the keyboard part and the panel part, and the switch circuit part can be shared, so that it was formed separately. It is possible to greatly simplify the circuit configuration as compared with the electronic musical instrument of.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be specifically described below with reference to the drawings. 1 is an exploded perspective view showing the configuration of a first embodiment of the present invention, FIG. 2 is an exploded perspective view of the sheet substrate,
FIG. 3 is a perspective view of an essential part showing an example of the panel switch sheet portion of the sheet substrate, and FIG. 4 is a sectional view showing an assembling state along line XX of FIG.

First, the schematic construction of this electronic musical instrument will be described with reference to FIG. This electronic musical instrument has an upper case 1 having a panel surface 1a on which a plurality of operators (not shown) are arranged.
And a key switch sheet portion 3a for disposing a keyboard 2'for swingably supporting a plurality of white keys 2a and a plurality of black keys 2b on a keyboard frame 2c and a key switch (not shown) corresponding to each key. A panel switch sheet section 3 in which a keyboard section 2 configured, the key switch sheet section 3a, and operator switches (not shown) corresponding to each operator are arranged.
A flexible sheet substrate 3 in which b and 3c are integrally formed, and a holding plate 4 for pressing and fixing the panel switch sheet portion 3b from below to the back surface of the panel surface 1a of the upper case 1.
And the keyboard 2, sheet substrate 3 and pressing plate 4 to the upper case 1
And a lower case 5 which is sandwiched between the lower case 5 and the lower case 5.

The upper case 1 is in the form of a lid having a shallow depth, and an opening 1b in which the keyboard 2 is arranged is opened in the center of the front side excluding the left and right sides and the rear panel surface 1a. On the left rear side of the upper case 1, a sound emitting portion 1c for a speaker of an electronic musical instrument is provided.
However, on the front and rear panel surfaces 1a, operators such as a pitch bend controller or tone color switches,
A plurality of through holes 1d for providing the effect switch or both are provided.

On the back surface of the panel surface 1a of the upper case 1, as shown in FIG. 4, a holding plate 4 which also serves as a reinforcing rib at a plurality of locations.
Is provided on the pressing plate 4.
A plurality of positioning / temporary fixing grooves 4a that come into contact with e are provided. Further, the panel switch seat portion 3b is fitted and disposed between the back surface of the panel surface 1a and the pressing plate 4 by engaging the engagement hole 4b of the seat portion 3b with the seat positioning protrusion 1f.

A screw hole may be formed in the projection 1f and the corresponding portion of the pressing plate 4 to fix the pressing plate 4 with a screw, or another portion may be fixed with a screw, but a rib locking portion. 1e (left part) may also be provided with a locking recess, and this may be replaced with the locking means of the pressing plate 4. In this case, the seat portion 3b can be detached by disassembling it into the upper and lower cases and strongly pushing down from the hole 1d.

The sheet substrate 3 is a polyester film,
As shown in the development view of FIG. 2, a sheet made of a flexible and insulating material such as polyimide film is provided, and cuts 3d and 3d 'are provided in one substantially rectangular sheet to form the substrate portions 3a' and 3 '.
b'and bent portions 3a ", 3b", 3c "are formed respectively, and each bent portion is formed by two or three layers in the direction of the arrow with each folding curve 3h indicated by a dot-dash line through a spacer (not shown). A membrane switch is constructed by folding it with a slight gap between the switch and the switch. If the volume is formed, the spacer may be unnecessary.

Fixed and movable switches constituting a key switch and an operator switch, which are normally kept in an off state and are turned on by being pressed against the surfaces of the sheet substrate 3 which face each other when folded. Connector terminals for forming patterns respectively and for collectively connecting the key switch conducting wire portion and the operating element switch conducting wire portion to the main circuit portion such as the CPU or the sound source of the musical instrument body at the end portion of the sheet substrate 3. 3e is provided. Further, between the key switch sheet portion 3a of the sheet substrate 3 and the panel switch sheet portions 3b and 3c, a step portion 3f corresponding to a step between the panel surface 1a and the keyboard portion 2 in the state where the keyboard 2 is incorporated, 3 g (FIG. 1) are each formed.

FIG. 3 shows an example of a switch pattern formed on the panel switch sheet portion 3b of the sheet substrate 3, in which a non-conducting fixed contact 6a corresponding to each operator and a digital pattern are formed on the substrate portion 3b '. Type volume patterns 6b and conductive wire patterns 6c for connecting them to the connector terminals 3e, respectively, and on the bent portions 3b ″, carbon is formed on the metal patterns corresponding to the fixed contacts 6a and the volume patterns 6b. Movable contacts 7a and 7b made of a conductor are formed on the left end side of the key switch sheet portion 3a shown in Fig. 2 as well as the volume pattern 6b and movable contact 7b shown in Fig. 3. The movable contact shall be formed.

Spacers 9 made of long and thin double-sided adhesive tape or the like are provided on the upper, lower, left and right sides of each of the fixed and movable contact rows, and the bent portions 3b "are provided on the substrate portion 3b 'with a slight gap. By folding so as to face each other, the sheet substrate 3
To complete. Instead of interposing the spacer 9, an insulating resist having a thickness of about 0.3 mm may be applied around the fixed contact and applied to the spacer.

In the above digital type volume pattern 6b, the operator is used as a bend controller for real-time effect control such as pitch bend, vibrato or tremolo depth and speed, reverb depth, PAN and the like. Applied.

Further, the key switch may be a switch using a contact rubber member having a conventionally well-known bowl-shaped bulge portion in place of the membrane switch as described above, and in that case, the bent portion 3b ″ is provided. It suffices to provide a through hole through which the contact rubber member is inserted, and when the key switch is a membrane switch having an extremely short stroke, it is suitable to extend the actuator part of the key along the longitudinal direction of the key. It is good to secure the key stroke by giving it some elasticity.

The above-mentioned operator switch is a pressure switch whose output continuously changes depending on the type of each operator, such as a normal switch that is turned on and off by pressing, a digital type volume pattern, or the magnitude of pressing force. It can take various forms such as a sensor.

When assembling the respective members constructed as described above, first, the key switch seat portion 3a of the seat substrate 3 is mounted.
1 is formed between the keys 2a and 2b of the keyboard portion 2 and the keyboard frame 2c from the direction of the arrow A while extending the step portion 3g flat with the panel switch sheet portion 3c on the left end side in FIG. The two reverse L-shaped resin guides L1 and L2 that are outsert-molded into the frame 2c are inserted into the gaps L1 and L2 while being integrated with each other, and then the keyboard portion 2 is preliminarily used for each operator and speaker. Upper case 1 that incorporates etc.
Is inserted into the opening 1b from below.

The horizontal portions of the guides L1 and L2 are formed so as to be substantially parallel to the frame 2c or have a vertical distance shortened (almost 0) toward the free end. In the latter case, the key switch sheet portion 3a is press-fitted between L1 and L2, and when the fitting is completed, elasticity of the horizontal portion causes the frame 2c.
Can be held securely. After the insertion, if the vicinity of both ends of the keyboard is locked to the frame 2c by a screw or other locking means, the seat portion 3a can be fixed more reliably.

By holding the sheet portion 3a at a predetermined position of the frame, the panel switch sheet portion 3b of the sheet substrate 3 faces the back surface of the panel surface 1a of the upper case 1. Here, as shown in FIG. 4, the presser plate 4 is applied from below the panel switch seat portion 3b, the rear end thereof is applied to one locking portion 1e (right side) of the upper case 1, and the free end portion is indicated by an arrow B. The groove 4a (left side) by rotating the rib 1e
After it is fitted to (left side) and temporarily fixed, it is appropriately fixed with a set screw (not shown), etc., and each key switch section and operator switch section are connected via the connector terminal 3e to a sound source, an amplifier, and a control on the instrument main body side (not shown). Connected to the main circuit composed of circuits. Finally, the lower case 5 is fitted upside down in the upper case 1 and fixed to the tapping hole formed below the boss 5a together with the pressing plate 4 with screws to complete the assembling of the electronic musical instrument.

In the embodiment shown in FIG. 1, the frame 2
Since the key switch seat part can be assembled from the side (lateral) direction of the key after mounting the key to c, the switch seat part can be assembled, removed, and maintained after shipping by testing various switches during manufacturing. It is extremely easy and speedy to attach / detach the switch sheet part and to assemble it in manufacturing. In the past, the switch could not be maintained without removing the key.

Next, with reference to FIG. 5 to FIG. 7, a concrete example of the structure of the sheet substrate will be described with reference to a second embodiment in which a part of the first embodiment is modified. FIG. 5 is a perspective view of an essential part of the key switch sheet portion 13a of the sheet substrate 13 which is shown in a partially disassembled state before folding, FIG. 6 is a perspective view of an essential portion which shows the state after folding, and FIG. FIG. 3 is a perspective view of a main part of an upper case 1 in which is assembled with a keyboard 2.

As shown in FIG. 5, the key switch sheet portion 13a of the sheet substrate 13 includes a substrate portion 13a 'and a bent portion 13.
a "and a long hole 13i is formed along the bending line 13h formed between the base plate portion 13a 'and the bending portion 13a" and including the bending line 13g', 13g "of the step portion 13g. It is designed to absorb the dimensional deviation during bending.
Instead of continuously providing the long holes 13i between the bending curves 13g 'and 13g ", the bending curve 13h and the bending curves 13g' and 1 are formed.
One through hole may be provided at each intersection of 3 g ″.

The board portion 1 of the key switch sheet portion 13a
A non-conductive first fixed contact 6a corresponding to each of the keys 2a and 2b, a part of which is shown in FIG. 5, is formed on 3a '. Further, on the board portion 13c 'of the panel switch portion 13c arranged in a portion of the keyboard 2 of the upper case 1 which is provided with a step to form the through hole 1h of the adjacent Kashiwagi wooden portion panel surface 1g (Fig. 7). , A second fixed contact 6b for a controller switch or a pressure sensor, and these first and second fixed contacts 6a, 6
Conductive wire patterns 6c for guiding b to the aforementioned connector 3e (FIG. 1) are formed on the substrate portions 13a 'and 13c'.

Known contact rubber members 7 are provided on the substrate portion 13a 'corresponding to the first fixed contacts 6a. The contact rubber member 7 is integrally molded of an elastic material such as rubber, and as shown in FIG. 5, it has a bowl-shaped bulging portion 7a and a lower surface that is vertically provided on the inner surface of the top of the bulging portion 7a. A small bowl portion 7c having a movable contact 7b formed therein, a head portion 7d erected on the outer surface of the top portion, and a base portion 7e connected to the skirt portion of the bulging portion 7a. An adhesive agent is attached to the bottom surface of the base portion 7e. Is applied and adhered onto the substrate portion 3a '.

On the other hand, the bent portion 13a "of the key switch sheet portion 13a is formed with a through hole 13j corresponding to the contact rubber member 7 on the substrate portion 13a ', and the second portion on the panel switch sheet portion 13c' is formed. Corresponding to the fixed contact 6b of the above, a pressure sensor made of a mixture of carbon and insulating powder or a manipulator made of a mixture of carbon and insulating powder and a silver electrode for analogly detecting the pressure applied perpendicularly to the sheet surface. The movable contact 8 such as a switch is formed on the bent portion 13c ″.

Further, the second bent portion 13s has a second
Through hole 13j 'is formed corresponding to the fixed contact 6b of FIG.
As shown in FIG.
By sequentially folding c ″, the bent portion 13s serves as a spacer.

The other structure is the same as that of the first embodiment. According to this embodiment, the substrate portion 1 of the sheet member 13 is
3a 'and the bent line 13h of the bent portion 13a "and the stepped portion 13g
Since a common or separate through hole is provided at each intersection with the folding curves 13g 'and 13g ", it is possible to absorb the dimensional deviation caused by the overlapping of the sheet thickness at the intersection when the sheet member is bent. It also makes folding work easier.

Further, since the contact rubber member constituting the movable contact of the key switch is adhered to the sheet member 13 with an adhesive or the like, any one of the bulging portions of the plurality of key-integrated contact rubber members is formed. If there is a defect in a piece due to a defective mold or a mistake during manufacturing, all the key switches of the product will not be unusable, and only the defective one can be replaced before bonding. The number or scale can be greatly reduced. Further, even if there is a defect in the switch portion after manufacturing and shipping, only defective products of the individual contact rubber members 7 can be replaced with new ones by cutting with a cutter or the like or applying an adhesive dissolving agent or the like.

FIG. 8 is a perspective view showing an assembled state of the sheet substrate according to the third embodiment of the present invention, and FIG. 9 is a developed plan view of the sheet substrate. The sheet substrate 23 of this embodiment is shown in FIG.
As shown in FIG. 2, a sheet material such as a rectangular polyester film is provided with an L-shaped cut 23d to provide a key switch sheet portion 23a and a tone color switch panel switch sheet portion 2
3b and 3b are formed.

The key switch sheet portion 23a is composed of a board portion 23a 'and a bent portion 23a "to form a folding curve 23h in the middle, and the panel switch sheet portion 23b is bent to the board portion 23b' and the bent portion 23b. ″ And a fold line 23h ′ is formed in the middle, and the panel switch sheet portion 23b is formed.
23g ′ and 23g ″ are bent to form a stepped portion 23g
To form. In addition, a plurality of grooves 22 are formed on the keyboard frame 22c.
c'is provided and the sheet substrate 23 is inserted into the groove 22c 'from the rear end side of the panel switch sheet portion 23b in the direction of the arrow C to the assembled state shown in FIG.

According to this embodiment, a sheet material such as a polyester film can be effectively used without waste, and since the sheet substrate 23 is inserted from the front side to the rear side of the keyboard frame 22c, the assembling workability is also improved.

Next, FIG. 10 is a perspective view showing a sheet substrate of a fourth embodiment of the present invention, FIG. 11 is a developed plan view thereof, and a sheet substrate 33 is a rectangular sheet material as shown in FIG. A key switch sheet portion 3 having a linear cut 33d and having a key switch corresponding to about 2 to 6 keys.
3a and a panel switch sheet portion 33b having operator switches corresponding to a plurality of operators are formed.

The key switch sheet portion 33a is composed of the board portion 33a 'and the bent portion 33a "to form a folding curve 33h in the middle, and the panel switch sheet portion 33b is bent to the board portion 33b' and the bent portion 33b. ″ And a folding curve 33h ′ is formed in the middle thereof, and a folding line 33h is formed at an intermediate band between the key switch sheet portion 33a and the panel switch sheet portion 33b.
The step portion 33 shown in FIG.
form g.

In this embodiment, the seat substrate 33 can be inserted into the keyboard frame (not shown) similar to that of the previous embodiment from the direction of the arrow D to be assembled, and the utilization factor of the sheet material is high. Its workability is also very good.

FIG. 12 shows a contact pattern formed on the sheet substrate of the fifth embodiment of the present invention. In this embodiment, a plurality of, for example, 6 (2
The rubber sheet 47a integrally formed with the contact rubber member 47 is disposed on the board portion 43a 'of the key switch sheet portion 43a of the sheet board 43. Board part 43a '
A non-conducting concentric fixed contact 46a having two contact patterns of 1 make and 2 make and its conductive wire pattern 46c are formed on the upper part, and a time difference is provided correspondingly to the contact rubber member 47 side. First and second movable contacts (not shown) that press-contact the fixed contact 46 are provided.

On the bent portion 43a "side of the key switch sheet portion 43a, by hot pressing and cutting,
A concave portion 43m corresponding to the rubber sheet 47a and a plurality of through holes 43j corresponding to the contact rubber members 47 are formed, and the bent portion 43a "is formed on the folding line 43h as a boundary.
By folding to the 3a 'side, the rubber sheet 47a fits into the recess 43m, and the contact rubber member 47 is inserted into the through hole 43j.
Set its position to pass through.

At each intersection of the bending lines 43g 'and 43g "forming the stepped portion of the key switch sheet portion 43a and the bending line 43h of the bending portion 43a", there is a through hole for absorbing the dimensional deviation during bending. 43i 'and 43i "are provided respectively. The panel sheet switch part 43c on the left side of the folding curve 43g" in FIG. 12 is the back surface of the Kashiwagi wood part panel surface 1g of the upper case 1 shown in FIG. 16 or 32 ring-shaped fixed contact patterns 46b for the bend controller and the conducting wire patterns 46c 'are formed at the positions corresponding to, and the bent portions 43c "are made of a conductive material made of silver paste and carbon. The partial pattern 48 is formed.

Then, an adhesive is applied to the inner peripheral portions of the bent portions 43a "and 43c" and the outer peripheral portion of the recessed portion 43m to bend the bent portion 43a "along the bending line 43h into the substrate portions 43a 'and 43c'.
Fold it up. In this state, the rubber sheet 47a is fitted in the concave portion of the concave portion 43m to prevent its movement in the horizontal direction, and is held between the bottom surface of the concave portion 43m and the inner surface of the substrate portion 43a 'so that the rubber sheet 47a moves vertically. The movement is also blocked and it is firmly fixed. As another way of assembling, 43m recess
First, the rubber sheet 47a is turned upside down, and in this state, an adhesive is applied in a slight gap between the outer peripheral portion of the rubber sheet 47a and the outer peripheral portion of the recess 43m, and then the bent portion 43a ″ The substrate parts 43a 'and 43c' are folded.

In any of the above methods, the rubber sheet 4
Adhesive processing between 7a and the substrate portion 43a 'is unnecessary or extremely simple. Further, the plurality of contact rubber members 47 are integrally formed with the rubber sheet 47a, and the switch can be easily attached and folded by placing this aggregate,
Since a sensor assembly such as a pressure sensor and a volume can be constructed, the workability of producing a sheet member is extremely good.

Further, FIG. 13 is a perspective view showing a sixth embodiment of the present invention, and FIG. 14 is an enlarged view of a part of the panel surface of FIG. In this embodiment, a sheet switch 53, which is a membrane switch having a two-layer or three-layer structure similar to that of each of the above-described embodiments, is integrally molded with a key switch sheet portion 53a and step portions 53g and 53g '. Seat portions 53b and 53c
And the key switch sheet portion 53a is attached to the upper surface of the keyboard base 51b, and the panel switch sheet portions 53b and 53c are attached to the upper surface lower step portion 51a 'of the panel surface 51a of the upper case 51 to form a step. A plurality of key insertion holes 53g ″ are provided below the portion 53g.

According to this embodiment, since the sheet substrate 53 is adhered to the keyboard base 51b and the upper surface of the panel surface 51a, the sheet substrate can be attached very easily, the productivity is good, and the electronic musical instrument is inexpensive. Can be supplied to. In the above embodiment, the key switch seat portion 53a is arranged on the lower surface of the keyboard base 51b,
It is also possible to fix it with a holding plate, which facilitates the attachment of the key.

According to each of the above-mentioned embodiments, each key switch of the key switch sheet portion on the sheet substrate and each operator switch of the panel switch sheet portion are collectively scanned, and their on / off events are detected by the main circuit. Since it can be incorporated into one microcomputer, the detection circuit can be simplified, and the number of processing stages of multi / demulti and the number of connection terminals with the main circuit can be reduced.

For example, as shown in FIG. 15, when a 49-key switch circuit (matrix circuit) 60 is formed on a sheet substrate, 7 + 8 are provided between the demultiplexers 61 and 62 and the multiplexer 63 which form the key scan circuit.
= 15-pin terminal (connector terminal and cable are collectively referred to as a connector) is required, and 7-pin and 8-pin
It may be divided into two connectors of pins. Each connection line to the demultiplexer 62 and the multiplexer 63 may be branched from a common 8-pin connector. Reference numeral 64 in FIG. 15 is a control circuit including a tone generation circuit using a microcomputer.

In such a usage state, there are 64-49 = 15 unused matrix intersections (intersections without circles on the matrix of FIG. 15). Therefore, if a switch S and a diode D are provided at this unused matrix intersection in the same manner as the intersection with a circle in the figure (see the enlarged view), the switch can be maximized without increasing the demultiplexer and the IC of the multiplexer. You can add up to 15. Even in that case, the number of terminals (the number of pins of the connector) between the demultiplexer 51 and the demultiplexer 51 is only increased from 7 to 8.

Considering a case where five waves, that is, five tone color switches, are provided in the panel switch seat portion,
In FIG. 15, the number of terminals remains 15 by simply increasing the number of switches and diodes by 5. On the other hand, if the key switch and the tone color switch are handled separately, not only two extra demultiplexers and two ICs for the multiplexer are required, but also 5 + 1 = 6 terminals are additionally required.

When two demulti / multi ICs are used in series, a circuit which is driven by 4 bits and outputs 16 pins can be obtained. In this case as well, the same as in the case of 8-pin output can be said.

Conventionally, the above-mentioned JP-A-59-61887 is used.
As can be seen in the publication, the key switch circuit (board) and the tone color switch circuit (board) are provided separately.
Because there was a step between the two, I had to set them separately. Therefore, the key scan has not been performed on the two types of switch groups, that is, the key switch group and the tone color switch group at once, but it is considered that the circuit processing of the present invention is excellent even in the case of intentionally doing so. Try.

That is, except for the switch circuit (matrix circuit) 60 'shown in FIG. 16, the demultiplexers 61, 62, the multiplexer 63 and the control circuit 6 shown in FIG.
4 is provided on the main board 65, the connection of scan lines between the key switch board 66 for 49 keys and the tone switch board 67 for 15 tones and the main board 65 is as shown in FIG. 17 or FIG. become. This is because the key switch section (key switch board 66) and the panel switch section (tone color switch board 67) have steps as described above, and unless the circuit processing of the present invention is performed, they must be divided into a plurality of boards. is there.

In the case of FIG. 17, a connector 68 having 7 + 8 = 15 terminals is provided between the key switch board 66 and the main board 65, and 2 + 8 = 10 terminals is provided between the tone color switch board 67 and the main board 65. The individual connectors 69 are used for connection. In the case of FIG. 18, the key switch board 66 is provided without connecting the tone color switch board 67 directly from the main board 65.
Connect from.

In this case, since the signal to the tone color switch board 67 is also handled by the key switch board 66, the connector to the key switch board 66 requires 8 + 8 = 16 connectors 68 ', and the key switch board 66 is required. 2 + 8 = 10 connectors 70 are required to connect the tone color switch board 67 to the tone color switch board 67.

By using the sheet substrate according to the present invention,
Each key switch on the key switch seat and each operator switch on the panel switch seat (tone switch in this example)
The respective common line patterns of are formed continuously in a common sheet substrate, and the key switch substrate 66 and the tone color switch substrate 67 in FIGS. 17 and 18 are the same sheet substrate 73 as shown in FIG. Therefore, although the 16-pin connector 68 'is connected to the main board 65, the connector 69 or the connector 70 is not required. This merit is great. The number of switches is 128, 25
The same can be considered when the number is increased to 6 ...

[0055]

As described above, the electronic musical instrument according to the present invention has the key switch provided for each key, the operator switch provided for each operator, and the conductor pattern thereof. Since it is formed on a common sheet substrate having flexibility, it becomes possible to make a separate circuit part having a stepped part into a common circuit, which simplifies the incorporation into the musical instrument main body, and at the same time, the above-mentioned conducting wire pattern and the musical instrument main body side Since only one electrical connection portion with the main circuit portion is required and the number of pins of the connector is small, it is possible to greatly simplify the entire circuit configuration and remarkably improve maintainability.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a configuration of a first embodiment of the present invention.

FIG. 2 is a developed perspective view of the sheet substrate.

FIG. 3 is a perspective view of relevant parts showing an example of a switch pattern on the sheet substrate.

FIG. 4 is a cross-sectional view showing an assembling state along line XX in FIG.

FIG. 5 is a perspective view of a main part of the sheet substrate according to the second embodiment of the present invention, which is shown in a partially disassembled state before folding.

FIG. 6 is a perspective view of an essential part showing a state after folding the same.

FIG. 7 is a perspective view of relevant parts showing the Kashiwagi part of the upper case in the same state where the sheet substrate is assembled together with the keyboard 2.

FIG. 8 is a perspective view showing an assembled state of the sheet substrate according to the third embodiment of the present invention.

FIG. 9 is a developed plan view of the sheet substrate.

FIG. 10 is a perspective view showing a sheet substrate of a fourth embodiment of the present invention.

FIG. 11 is a developed plan view of the same.

FIG. 12 is a perspective view of an essential part of the sheet substrate according to the fifth embodiment of the present invention, which is shown in a partially disassembled state before folding.

FIG. 13 is a perspective view showing a state in which a key and a manipulator of a sixth embodiment of the present invention are removed.

FIG. 14 is an enlarged sectional view showing a part of the panel surface of the same.

FIG. 15 is a block diagram showing a configuration example of a key scan circuit in an electronic musical instrument according to the present invention.

FIG. 16 is a diagram showing a configuration example of a switch circuit (matrix circuit).

FIG. 17 is a block diagram showing a connection example of substrates in a conventional electronic musical instrument.

FIG. 18 is a block diagram showing another example of connection of substrates in a conventional electronic musical instrument.

FIG. 19 is a block diagram showing a connection example of substrates in the electronic musical instrument according to the present invention.

[Explanation of symbols]

1 ... Upper case, 2 ... Keyboard part, 3, 13, 23, 33, 4
3, 53, 73 ... Sheet substrates 3a, 13a, 23a,
33a, 43a, 53a ... Key switch sheet portion, 3b,
3c, 13c, 23b, 33b, 43c, 53b, 53
c ... Panel switch sheet portion, 4 ... Pressing plate, 5 ... Lower case, 6a, 6b ... Fixed contact, 7,47 ... Contact rubber member, 8 ... Movable contact, 9 ... Spacer

Claims (1)

[Claims] 1. An electronic musical instrument in which a keyboard circuit section of a keyboard having a plurality of keys and a panel circuit section of a panel having a plurality of operating elements are provided with a predetermined step, and are provided corresponding to each of the keys. The key switch, the operator switch provided corresponding to each of the operators, and the conductor pattern thereof are formed on a common sheet substrate having flexibility capable of forming a step portion corresponding to the step. An electronic musical instrument characterized by doing