JP2002033589A - Mounting device for circuit roard for electronic musical instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mounting device by which a circuit board can be attached to the panel of an electronic musical instrument simply and surely so as not to cause looseness, and by which the circuit board is not bent. SOLUTION: In the device, a receiver groove 13 into which the end edge of the circuit board 9 of the electronic musical instrument is inserted and the fixation part 15 of a setscrew 14 which is inserted into and passed through the circuit board, are formed at the inside surface of the panel 4 of the musical instrument formed by an extrusion molding operation or the like, and the circuit board is attached and fixed to the inside surface of the panel so as to be along its board face. A receiver 13a on the side of the panel constituting the receiver groove is formed in a depth longer than the receiver 13a on its opposite side, and a protrusion part 16 which protrudes to the direction of the receiver groove is formed in the receiver on the side of the panel. The protrusion is formed in a position which does not face the receiver on the opposite side, and the face of the receiver on the opposite side is formed in parallel to a line 17 which connects the top of the protrusion to the top of the fixation part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mounting device for mounting a substrate of an electronic circuit for controlling sound generation on an electronic musical instrument such as an electronic keyboard musical instrument.

[0002]

2. Description of the Related Art Conventionally, an extruded aluminum material c has been used for a panel b constituting an exterior of an electronic keyboard musical instrument a as shown in FIG. 1, for example. The electronic circuit board d is also mounted. It is desired that the circuit board d can be easily attached to the panel b in order to reduce the number of assembling steps, and in order to satisfy this demand, a receiving groove for inserting an edge of the circuit board into an inner surface of the panel b. e, and a fixing portion g of a set screw f through which the circuit board is inserted is provided, and it is considered that the circuit board is attached and fixed to the inner surface of the panel along the surface of the circuit board.

[0003]

According to this, there is an advantage that the circuit board d can be fixed to the panel b with a small number of screws f. However, both the wall surfaces j and j forming the receiving groove e are shown in FIG.
When it is formed in parallel as described above, it is difficult to secure a clearance with the circuit board d, and it becomes difficult to manage the fitting of the circuit board d. That is, if the groove width of the receiving groove e is narrowed so as to securely hold the circuit board d, there is a concern that insertion of the circuit board d becomes difficult as shown in FIG. As shown in FIG. 2B, there is an inconvenience that the circuit board d moves.

In order to eliminate such inconvenience, the receiving groove e is formed so that its groove direction is shifted from the installation direction of the circuit board d as shown in FIG. 3, so that the circuit board d does not move into the receiving groove e. In order to ensure the clearance and secure the clearance for inserting the circuit board d,
The circuit board d is bent when screwed to the fixing portion g because its end is fitted in the receiving groove e. Since the degree of the curvature is different for each circuit board, the panel b and the circuit board d It was difficult to maintain and maintain a constant distance. In a musical instrument of a type in which a plurality of key tops h are provided on the panel b and each strokes and presses each tact switch i provided on the circuit board d, the panel b and the circuit board d
If the distance is not constant, the operation stroke of each key top h is not constant, and the operation feeling varies, which is not preferable.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a mounting device for securely mounting a circuit board to a panel of an electronic musical instrument simply and without loosening, and which does not cause bending of the circuit board.

[0006]

According to the present invention, a receiving groove into which an edge of a circuit board of an electronic musical instrument is inserted, and the circuit board are inserted into an inner surface of a panel of the electronic musical instrument formed by extrusion molding or the like. A fixing portion for fixing a set screw, and mounting and fixing the circuit board on the inner surface of the panel along the surface of the circuit board. The above-mentioned object is achieved by forming the projection at a depth longer than the portion and forming a projection protruding in the direction of the receiving groove at the receiving portion on the panel side. The protrusion is formed at a position that does not face the opposite receiving portion, thereby facilitating insertion of the circuit board. The receiving portion on the opposite side is parallel to a line connecting the vertices of the projecting portion and the fixing portion. The circuit board can be mounted at an accurate distance along the panel by forming the surface of the panel. In such a configuration, a key top is provided on the panel so as to be able to protrude and retract, and the circuit board is actuated by pressing the key top. It can be conveniently applied to an electronic musical instrument provided with a switch.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. FIGS.
In FIG. 4, the reference numeral 2 in FIG.
A key consisting of a black key and a white key arranged between “a” and 3 in FIG.
Indicates a wooden shelf board. The rear and upper surfaces of the electronic keyboard instrument 1 are covered with a panel 4 made of an extruded aluminum material, a speaker 5 is mounted behind the panel 4, and the front of the speaker 5 is covered with a speaker cover 6.

The end 4a at which the panel 4 comes into contact with the shelf 3
And a positioning stopper 4b abutting on the end face of the shelf 3
And a fixing piece 4c which is in contact with the lower surface of the shelf plate 3 and is fixed by a screw 18 so that it can be mounted accurately. An electronic circuit board 9 having a plurality of tact switches 8 for controlling the rhythm of the electronic musical instrument 1 and an electronic circuit in addition to the speaker 5 and the keyboard mechanism 7 is provided inside the panel 4. Each tact switch 8 is actuated by a key top 10 provided on the upper surface of the panel 4 so that the player can easily perform an operation during the performance.

The circuit board 9 is attached to two parallel rows of standing walls 11 and 12 protruding from the upper inner surface of the panel 4, and an end of the circuit board 9 is inserted into a receiving groove 13 provided at the end of one of the standing walls 11. The set screw 1 with the circuit board 9 inserted through the groove-shaped fixing portion 15 at the top of the other standing wall 12
4 by fixing. However, according to such attachment, it is difficult to attach the circuit board 9 smoothly and without looseness, and it is also difficult to accurately maintain the distance between the panel 4 and the circuit board 9. The depth L of the receiving portion 13a on the panel side is longer than the depth M of the receiving portion 13b on the opposite side, and the receiving groove 13 is formed in the receiving portion 13a on the panel side.
Forming a projection 16 projecting inwardly of the
6, the width of the receiving groove 13 is provided with a margin by the protruding height N, and the end of the circuit board 9 is obliquely inserted into the receiving groove 13 and then fixed to the fixing portion 15 with the set screw 14 so that the circuit board 9 can be loosened smoothly. Circuit board 9 can be mounted.

In the illustrated example, the edges of both receiving portions 13a and 13b are formed to have a rounded shape, and the groove direction of the receiving groove 13 is formed in the same direction as the surface direction of the panel 4 to form the circuit board. 9 can be attached and fixed along the inner surface of the panel 4. The receiving portion 1 on the opposite side is parallel to a line 17 connecting the top of the projection 16 and the top of the fixing portion 15.
By forming the surface 3b, the circuit board 9 can be attached and fixed without bending, and the distance between the tact switch 8 and the key top 10 can be set accurately. The shape of the fixing portion 15 is arbitrary, and may be constituted by a boss. The receiving groove 13 may be formed of a plastic molded product and attached to the standing wall 11.

In the embodiment shown in FIG. 5, the panel 4 is formed from an extruded aluminum material, and the line 17 connecting the projection 16 and the top of the fixing portion 15 is set so as to be parallel to the inner surface of the panel 4. The provision of the protruding portion 16 allows a sufficient width of the receiving groove 13. After inserting the end of the circuit board 9 at an angle, the screw is fixed to one portion of the fixing portion 15 to allow for free movement. In this case, the circuit board 9 is not bent, so that the distance between the tact switch 8 and the key top 10 becomes uniform, and the operation feeling of the key top 10 is improved. Note that the panel 4 can be made of a plastic molded product.

[0012]

As described above, according to the present invention, the receiving portion on the panel side of the receiving groove for inserting the edge of the circuit board of the electronic musical instrument is formed to have a depth longer than the receiving portion on the opposite side. Since the projection on the panel side is provided with a projection protruding in the direction of the receiving groove, the circuit board can be reliably inserted into the receiving groove with a margin, and the circuit board is screwed to the fixing portion of the panel. In this case, it is possible to easily attach the protrusion without causing deflection and to be able to attach the protrusion so as not to move. For example, the protrusion is formed at a position that does not face the receiving portion on the opposite side. The width of the groove can be substantially enlarged, and the surface of the receiving portion on the opposite side is formed in parallel with the line connecting the vertices of the projection and the fixing portion, thereby preventing the deflection of the circuit board and preventing the panel and the circuit board from being bent. Distance accuracy is improved, and key switch operation feeling can be uniformed There is a result.

[Brief description of the drawings]

FIG. 1 is a cut-away side view of a circuit board mounting device of an electronic musical instrument considered earlier.

FIG. 2 is an enlarged view of a mounting portion of FIG. 1;

FIG. 3 is a cutaway side view of another mounting state of FIG. 1;

FIG. 4 is a plan view showing an embodiment of the present invention.

FIG. 5 is an enlarged sectional view taken along line 5-5 of FIG. 4;

FIG. 6 is an enlarged view of a main part of FIG. 5;

FIG. 7 is an explanatory view of the operation state of FIG. 5;

[Explanation of symbols]

4 panel, 8 tact switch, 9 circuit board, 10
Key switch, 13 receiving groove, 13a receiving groove on panel side, 13b receiving groove on opposite side, 14 set screw, 15
Fixed part, 16 protrusion, 17 lines,

Claims (4)

[Claims] An electronic musical instrument panel formed by extrusion or the like has a receiving groove for inserting an edge of a circuit board of the electronic musical instrument, and a fixing portion for a set screw passing through the circuit board. In a device for mounting and fixing the circuit board along an inner surface of the panel, a receiving portion on the panel side constituting the receiving groove is formed to have a depth longer than a receiving portion on the opposite side. A circuit board mounting device for an electronic musical instrument, wherein a projection protruding in the direction of the receiving groove is formed in a receiving portion on the panel side. 2. The circuit board mounting device for an electronic musical instrument according to claim 1, wherein said projecting portion is formed at a position not opposed to said opposite receiving portion. 3. The circuit board mounting device for an electronic musical instrument according to claim 1, wherein a surface of said opposite receiving portion is formed in parallel with a line connecting each vertex of said projecting portion and said fixed portion. . 4. The circuit board mounting for an electronic musical instrument according to claim 1, wherein a key top is provided on the panel so as to be freely retractable, and a tact switch operable by pressing the key top is provided on the circuit board. apparatus.