JPS6318061Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention is an electronic musical instrument keyboard in which a board on which fixed and movable contacts of keyboard switches corresponding to the keys are attached is attached to a keyboard chassis on which a plurality of keys are attached via a holder. Regarding equipment.

Conventionally, in this type of keyboard device, in order to hold a printed circuit board d on which a fixed contact b and a movable contact c of a keyboard switch a are arranged on a keyboard chassis f on which a plurality of keys e are mounted, the steps shown in FIGS. As shown in Figure 1B, a plurality of annular holders g are arranged between the keyboard chassis f and the printed circuit board d, and screws h are inserted from the bottom of the printed circuit board d into the holes of the printed circuit board d and the holder g. This is done by screwing it through to the keyboard chassis f.

However, in this case, each of the holders g is an independent member, and when the keyboard device is assembled, the holders g are hidden by the printed circuit board d, making it difficult to fasten with screws and requiring a large number of assembly steps.

It is an object of the present invention to provide a keyboard device for an electronic musical instrument that can eliminate such conventional drawbacks and prevent the board from warping or deforming. A keyboard switch is constructed by placing a movable contact holding member on which a movable contact is arranged so as to be positioned opposite to the fixed contact on a board on which a contact is arranged, and the board is held through a holder. In the case where the holder is fixed to the keyboard chassis with a stopper, the holder consists of two plate-shaped holding members connected by a hinge, and one of the holding members is fixed to the keyboard chassis with a stopper.
The movable contact holding member has a through hole passing through the movable contact holding member, and by bending the hinge, the two holding members are overlapped with the substrate interposed, and one of the holding members is brought into contact with the keyboard chassis. , the board is fixed to the keyboard chassis by fitting or screwing into the board a separate stop that is either integrated with the holder or latched thereto.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 2 shows one embodiment of the present invention, and FIG. 3 shows the keyboard switch 1 thereof.

The substrate 4 has printed fixed contacts 2 and diodes 11 inserted into the printed circuit,
A movable contact holding member 12 made of a flexible material and provided with a plurality of movable contacts 3 is placed on the substrate 4 so that the movable contacts 3 are positioned opposite to the fixed contacts 2 of the substrate 4. A locking piece 13 integrally provided on the lower surface of the member 12 is fitted into the hole 14 of the substrate 4 and fixed.

As shown in FIGS. 4A and 4B, the holder 5 for the substrate 4 is composed of two plate-shaped holding members 9, 10 connected by a suitable number of hinges 8 integrally molded, for example, from synthetic resin. Consists of. In the figure, 24 is a hole into which the locking piece 13 of the movable contact holding member 12 is fitted, and 25 is a through hole passing through the movable contact holding member 12.

Thus, the holding member 10 of this holder 5 is placed on the lower surface of the substrate 4 to which the movable contact holding member 12 is fixed, as shown in FIG. Then, by bending the hinge 8, the holding member 9 is placed on the upper surface of the substrate 4, and is overlapped with the holding member 10, and the hole 17 of the holding member 9 is fitted into the protrusion 15, thereby temporarily fixing it. Then, this assembly is attached to the bottom surface of the keyboard chassis 6 as shown in the second figure, and the screws 7-1, which are fasteners, are inserted into the holes 1 of the holding members 9 and 10 from below.
8 - 1 , 18 - 2 , 19 - 1 , 19 - 2 and the holes 20 in the board 4 and screwed to the keyboard chassis 6 .

FIGS. 6A and 6B show another example of the holder 5, in which a recess 21 for holding the movable contact holding member 12 is provided on the substrate contacting side of the holding member 9.

When using this, a positioning protrusion 22 is provided on the lower surface of the movable contact holding member 12 in place of the locking piece as shown in the third figure, and this is fitted into the hole 23 of the substrate 4 to hold the member 12. is placed on the substrate 4.

A holding member 10 is attached to the lower surface of the substrate 4 as shown in FIG. 7, and the holding member 9 is brought into close contact with the upper surface of the substrate 4 by bending the hinge 8.
0, and the movable contact holding member 12 is held in the recess 21 of the holding member 9. After this, as shown in the second figure, this assembly is screwed to the keyboard chassis 6.

According to this holder 5, the number of steps for fixing the movable contact holding member 12 to the substrate 4 can be saved.

Note that the protrusions 15 and holes 1 in each example of the holder 5
7 may be omitted, and the protrusion 22 for positioning the movable contact holding member 12 and the hole 23 of the substrate 4 that fits into the protrusion 22 as shown in FIG. 7 may not be provided.

Figure 8 shows that instead of screw 7-1 as a stopper,
Locking piece 7 erected integrally with holding member 9 of holder 5
-2 is another example of the holder using the locking piece 7.
-2 are installed upright instead at positions corresponding to the holes 18-1 and 19-1 of the holding member 9 of the holder 5 shown in FIGS. 6A, B and 7, for example. .

In this way, according to the present invention, the holder 5 is composed of two holding members 9 and 10 connected by a hinge 8, and the substrate 4 is held by bending the hinge 8 of the two holding members 9 and 10. Interpose and overlap,
The board 4 is held by the holding members 9 and 10, and the board is fitted or screwed to the keyboard chassis through the holding tool, either integrally with the holding tool or with a separate stopper latched to the holding tool. When assembling the keyboard device, the board 4 can be easily fixed to the keyboard chassis 6, reducing the number of assembly steps, and has the effect of preventing warpage and deformation of the board.

[Brief explanation of drawings]

1A and 1B show a keyboard device of a conventional electronic musical instrument, FIG. 1A is a partially cutaway view, and FIG. 1B is a
FIG. 2 is a partially cutaway side view of an embodiment of the present invention, FIG. 3 is an exploded perspective view of the keyboard switch and the board, and FIG. 4A is a view of the holder. FIG. 4B is a plan view, FIG. 4B is a side view, FIG. 5 is a cross-sectional view for explaining how the holder is attached to the substrate 4, and FIGS. 6A, 6B, and 7 are views of the holder. 6A is a plan view thereof, FIG. 6B is a side view, FIG. 7 is a sectional view showing the state attached to the board, and FIG. 8 is a holder showing the state attached to the board. It is a sectional view of another example. 1...Keyboard switch, 2...Fixed contact, 3...
Movable contact, 4... Board, 5... Holder, 6... Keyboard chassis, 7-1, 7-2... Stopper, 8...
Hinge, 9, 10... Holding member, 25... Through hole.

Claims (1)

[Scope of utility model registration request] A keyboard switch is constructed by placing a movable contact holding member on which a movable contact is disposed to face the fixed contacts on a board on which a pair of fixed contacts are disposed corresponding to each key. In the case where the board is fixed to the keyboard chassis via a holder with a fastener, the holder is composed of two plate-shaped holding members connected by a hinge, and one of the holding members has the above-mentioned plate. The movable contact holding member has a through hole passing through the movable contact holding member, and by bending a hinge, the two holding members are overlapped with the substrate interposed, one of the holding members is brought into contact with the keyboard chassis, and the holding member is 1. A keyboard device for an electronic musical instrument, characterized in that said board is fixed to a keyboard chassis by fitting or screwing into the board a separate stopper that is integrated with or latched to the board.