JPH1074427A - Pushbutton switch panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To omit conventional compricated work, wherein a dome-like movable plate is fixed by a fixing sheet to the given position of a printed board before assembly, to improve the productivity of this kind switch panel. SOLUTION: In this pushbutton switch panel 1, a dome-like movable plate 3 is positioned to electrode parts 2a and 2b, to be fixed to a printed board 2 by an operating panel 4. This can omit conventional complicated work, wherein the dome-like movable plate 3 is fixed to the given position of a printed board 2 by a fixing sheet before assembly, to simplify an assembly process, and also can eliminate regulating the movement of the action of the dome-like movable plate 3 by a fixing sheet, also eliminate causing insufficient snapping sense.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a push button switch panel used as an operation unit of office equipment such as a copying machine, a facsimile machine, a printer, or household appliances such as a microwave oven and an electric washing machine. It is.

[0002]

2. Description of the Related Art FIG. 5 shows an example of the structure of a conventional push button switch panel 90 of this type.
The electrode portions 91a and 91b are covered with a dome-shaped movable plate 92 formed by molding at least a part of a thin metal plate or conductive rubber into a dome shape.

At this time, the dome-shaped movable plate 92 is placed at a predetermined position, and is fixed on a printed board by a fixing sheet 93 made of, for example, a thin soft resin or rubber and coated on one side with an adhesive. Adhesion that is integrated with the fixing member 91 is performed, and fixing to the predetermined position is performed.

Incidentally, the fixing by the fixing sheet 93 may be performed by fixing all of the plurality of dome-shaped movable plates 92 with one fixed sheet 93. On the other hand, there is a case where one fixing sheet 93 is prepared, and fixing is performed on each of them.

Further, an operation panel 94 is provided above the printed circuit board 91 at an appropriate interval, and a key is provided between the operation panel 94 and the dome-shaped movable plate 92 including the fixed sheet 93. The push button switch panel 90 is configured with the top 95 held therebetween.

In the push button switch panel 90 configured as described above, when the key top 95 is pressed, the dome-shaped movable plate 92 is deformed into a plate shape, and short-circuits between the electrode portions 91a and 91b. A switch action is performed. At this time, when deforming from a dome shape to a flat shape, or conversely, when returning from a flat shape to a dome shape, an appropriate snap feeling is obtained and the operational feeling is improved.

[0007]

However, in the above-described push button switch panel 90 having the conventional structure, first, the dome-shaped movable plate 92 is connected to the printed circuit board 9.
When the fixing sheet 93 adheres to the predetermined position, positioning, correction, and the like are troublesome, and the assembly process of the push button switch panel 90 is complicated.

Second, since the dome-shaped movable plate 92 is adhered to the fixed sheet 93, the movement during operation is hindered and restricted by the fixed sheet 93. For example, when the dome is deformed from a dome shape to a flat shape, stress is reduced. As a result, the life of the push button switch panel 90 is shortened, for example, by causing cracks in the dome-shaped movable plate 92 at an early stage.

Thirdly, the movement of the dome-shaped movable plate 92 is hindered by the fixed sheet 93 for the same reason as described above.
Because of the restriction, the snap feeling generated when the dome-shaped movable plate 92 is deformed and returned is also impaired, which causes a problem that the operational feeling of the push button switch panel 90 is reduced. Was to be solved.

[0010]

According to the present invention, as a specific means for solving the above-mentioned problems, an electrode portion provided on a printed circuit board is covered with a dome-shaped movable plate formed of a conductive member. In a push button switch panel having a key top disposed between a movable plate and an operation panel, the dome-shaped movable plate is positioned by the operation panel with respect to the electrode portion and fixed to the printed circuit board. The present invention solves the problem by providing a push button switch panel characterized by the following.

[0011]

Next, the present invention will be described in detail based on an embodiment shown in the drawings. 1 and FIG.
Is a push button switch panel (hereinafter, abbreviated as switch panel 1) according to the present invention.
a and 2b are covered with a dome-shaped movable plate 3 formed of a conductive member, and a key top 5 is arranged between the dome-shaped movable plate 3 and the operation panel 4 as in the conventional example. It is.

Here, in the present invention, the dome-shaped movable plate 3 is used.
When fixing the dome-shaped movable plate 3 between the printed board 2 and the operation panel 4 without using a fixing sheet as in the conventional example, when fixing the Positioning and fixing are performed.

In the following, the above configuration will be described in more detail. For example, positioning holes 2c having appropriate diameters are formed at, for example, four positions on the periphery of the electrode portions 2a and 2b of the printed circuit board 2.
Is provided. A boss 41 is provided on the operation panel 4 at a position corresponding to the positioning hole 2c provided on the printed circuit board 2.

At this time, the boss 41 has a small-diameter portion 41a having an outer diameter that can be fitted into the positioning hole 2c and a large-diameter portion 41b having an outer diameter larger than the positioning hole 2c.
The dome-shaped movable plate 3 is provided with an outer frame 3b outside the movable portion 3a, and the outer frame 3b has the same arrangement and the same hole diameter as the positioning holes 2c of the printed circuit board 2. A mounting hole 3c is provided.

Therefore, the small-diameter portion 41a of the boss 41 of the operation panel 4 is inserted with the dome-shaped movable plate 3 overlaid on the printed circuit board 2 and the positioning hole 2c and the mounting hole 3c are aligned with each other. If it is in the abutting state, first, the operation panel 4 is to be mounted at a predetermined position with respect to the printed circuit board 2, and at this time, the height D of the large diameter portion 41b is set.
Is appropriately set, the distance between the printed circuit board 2 and the operation panel 4 is also set to an appropriate value.

At the same time, the dome-shaped movable plate 3 is sandwiched between the large-diameter portion 41b of the boss 41 of the operation panel 4 and the printed circuit board 2, so that the dome-shaped movable plate 3 is also positioned at a predetermined position. Is fixed. Therefore, when the key top 5 is desirably placed in the key top hole 4a of the operation panel 4 when performing the above-described assembly, the printed circuit board 2, the dome-shaped movable plate 3, and the operation panel 4 are respectively formed as described above. Since the key top 5 is set at the predetermined position, the key top 5 is also held at the predetermined position.

Next, the operation and effects of the switch panel 1 of the present invention having the above-described configuration will be described. First, according to the present invention, the dome-shaped movable plate 3 is positioned between the printed circuit board 2 and the operation panel 4 for positioning and mounting. The complicated work of fixing the dome-shaped movable plate 3 at the position with the fixing sheet can be omitted.

Second, according to the present invention, since the movement of the dome-shaped movable plate 3 during deformation is not restricted by the fixed sheet, stress is partially concentrated upon deformation and the life is shortened. In addition, the original snap operation is not impaired by the restriction of the movement by the fixed sheet.

FIG. 3 shows another embodiment of the present invention. By eliminating the need for a fixing sheet according to the present invention, the operation can be simplified and the operation can be clarified. As it is, the fixed sheet was omitted,
It is undeniable that dust easily enters between the electrode portions 2a and 2b and the dome-shaped movable plate 3.

This embodiment is an improvement of the above point. For example, a boss hole corresponding to the position and the outer diameter of the large diameter portion 41b is formed in a dustproof film 6 formed by using a soft resin film member. 6a, the boss hole 6a is inserted into the large-diameter portion 41b to be held by the operation panel 4 and positioned between the dome-shaped movable plate 3 and the key top 5.

By doing so, the key top hole 4a
Dust that enters from the gap between the dome-shaped movable plate 3 and the key tops 5 does not reach between the dome-shaped movable plate 3 and the electrode portions 2a and 2b because the dust-proof film 6 covers the dust. . At this time, since the dustproof film 6 is separate from the dome-shaped movable plate 3, the dustproof film 6 has no influence such as impairing the snap operation.

FIG. 4 shows still another embodiment of the present invention. In each of the previous embodiments, a boss 41 is provided on the operation panel 4 and the boss 41 and the printed circuit board 2 are used to form a dome-shaped movable plate. 3 is fixed and fixed, but the present invention does not limit the boss 41.

That is, in this embodiment, the operation panel 4 has the electrode portions 2a, 2a provided on the printed circuit board 2.
A rib 42 having a step 42a at its tip is formed so as to surround b. The positioning and fixing of the dome-shaped movable plate 3 are performed by the step 42a, and the printed board 2 and the operation panel are controlled by the total height of the rib 42. 4 is set.

In the case of this embodiment, the dome-shaped movable plate 3 is attached to the printed circuit board 2 and the operation panel 4 by the electrode portions 2a,
Mutual positioning means for positioning the printed circuit board 2b is required. However, since the mounting means for mounting the printed circuit board 2 and the operation panel 4 is the above-described positioning means, there is no particular need to provide them.

The point is that the positioning and fixing of the dome-shaped movable plate 3 are performed by the printed circuit board 2 and the operation panel 4, and the fixing sheet is omitted, thereby simplifying the mounting of the dome-shaped movable plate 3. The gist of the present invention lies in that the dome-shaped movable plate 3 is not restricted during operation, and the shape of the embodiment is not limited as long as the gist is satisfied.

[0026]

As described above, according to the present invention, there is provided a push button switch panel in which the dome-shaped movable plate is positioned with respect to the electrode portion by the operation panel and fixed to the printed circuit board. First of all, the complicated operation of fixing a dome-shaped movable plate to a predetermined position on a printed circuit board with a fixing sheet prior to assembling can be omitted, and the productivity of this type of switch panel can be reduced. An extremely excellent effect for improvement is obtained.

Second, since the fixed sheet is not required for mounting the dome-shaped movable plate as described above, the movement of the dome-shaped movable plate during operation is not restricted by the fixed sheet. Due to this regulation, stress is concentrated on the dome-shaped movable plate and it is damaged early, or
It eliminates the lack of snap feeling due to the restricted movement, etc., and achieves extremely excellent effects in improving the reliability and performance of this type of switch panel.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of a push button switch panel according to the present invention in a partially exploded state.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a sectional view showing another embodiment of the push button switch panel according to the present invention.

FIG. 4 is a sectional view showing still another embodiment of the push button switch panel according to the present invention.

FIG. 5 is a sectional view showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... push button switch panel (switch panel) 2 ... printed circuit board 2a, 2b ... electrode 2c ... positioning hole 3 ... dome-shaped movable plate 3a ... movable part 3b ... outer frame 3c ... mounting hole 4 ... Operation panel 4a ... Key top hole 41 ... Boss 41a ... Small diameter part 41b ... Large diameter part 42 ... Rib 42a ... Stepped part 5 ... Key top 6 ... Dustproof film 6a ... Boss hole

Claims (1)

[Claims] 1. A push button switch panel comprising a dome-shaped movable plate formed of a conductive member covering an electrode portion provided on a printed circuit board, and a keytop disposed between the dome-shaped movable plate and an operation panel. The push-button switch panel is characterized in that the dome-shaped movable plate is positioned by the operation panel with respect to the electrode portion and fixed to the printed circuit board.