TWI451462B - Dome switch - Google Patents

Description

power switch button

BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to a push button switch that can be used as an operating switch in various electrical appliances, and more particularly to a movable contact point member having a reversing function.

As a structure of an existing contact plate and a push button switch using the same, a base formed with a fixed contact, a dome-shaped reversal piece opposed to the fixed contact on the base, and a paste in the opposite The patch is composed of an adhesive sheet that can be bent freely. The adhesive sheet is attached to the outside of the reversal film. Normally, the adhesive sheet is pressed from the decorative panel or the pressing panel of the electronic device so that the reversing film bonded thereto is reversed and comes into contact with the fixed contact. Switching of the contacts, in the electronic device to which the button switch is applied, usually includes a plastic button layer to facilitate the user to press and operate the button switch.

The above-mentioned operation mode of the push button switch has been implemented in the industry for many years, and in the process of implementation, there are corresponding technical improvements. For example, when the button switch is applied as a mobile phone button on a mobile phone, it is often constructed in a push button switch. A light-emitting LED lamp is added on both sides, and a light-transmitting layer is newly added in the original button switch structure, and the light-transmitting layer can evenly distribute the light emitted by the LED lamps on both sides of the button switch structure on the plastic button layer. The surface can make it easier for the user to use the mobile phone without lighting at night. This embodiment can be referred to the Chinese Patent Application No. CN 1222968.

The above-mentioned embodiment brings convenience to the operation of the user, but at the same time, there is also a factor that hinders the development of the button switch to be light and thin, and the overall height of the button switch is relatively high due to the addition of a light-transmitting layer capable of evenly distributing the light of the LED lamp. The increase has made it a violation of the trend of miniaturization of today's push button switches, and because of the increase in height, the comfort of the user's operating feel is also reduced, which will become a hindrance to the improvement of the push button switch.

In view of this, it is necessary to design a new button switch to solve the above problem.

The technical problem to be solved by the present invention is to reduce the overall height under the premise of maintaining good light transmission of the push button switch, and to conform to the development trend of thin and light button switches.

The present invention solves the above technical problems in this way: a push button switch mainly includes a pressing layer and at least one reversal film, the pressing layer has an upper surface and a lower surface, and the edge of the pressing layer protrudes from the lower surface and is provided with an extension portion. The pressing layer has good light transmittance and elasticity, and can scatter the light emitted by the light source to be evenly distributed on the upper surface of the pressing layer.

Compared with the prior art, the present invention has the advantage that the good light transmission of the pressing layer eliminates the light transmissive layer which is specially provided for the uniform transmission of the light source light in the prior art, so that the overall height of the push button switch is lowered.

1‧‧‧ Pressing layer

10‧‧‧ Press zone

100‧‧‧ accommodating space

101‧‧‧ upper surface

102‧‧‧lower surface

103‧‧‧Extension

104‧‧‧ Press column

105‧‧‧Gap section

2‧‧‧Reversal film

3‧‧‧Paste layer

31‧‧‧ top surface

32‧‧‧ bottom

33‧‧‧through hole

34‧‧‧Rings

35‧‧‧ venting holes

The first figure is an exploded perspective view of a preferred embodiment of the push button switch of the present invention; the second figure is an exploded perspective view of the other end of the push button switch shown in the first figure; Combination diagram; fourth diagram is a cross-sectional view of the push button switch shown in the first figure; Figure 5 is an exploded perspective view of another preferred embodiment of the push button switch of the present invention; the sixth figure is an exploded perspective view of the other half of the push button switch shown in Figure 5; Cutaway view.

Hereinafter, the present invention will be described in further detail with reference to the accompanying drawings.

Referring to the first to fourth figures, a preferred embodiment of the button switch of the present invention mainly comprises a pressing layer 1 and a reversal sheet 2 integrally disposed at a lower portion of the pressing layer 1.

The pressing layer 1 is substantially in the shape of a rectangular plane, and includes a flat pressing portion 10. The pressing portion 10 is provided with an upper surface 101 and a lower surface 102. The side edges of the pressing portion 10 extend outwardly and protrude downward. The surface 102 is provided with an extension 103 which is attached in parallel with a printed circuit board (not shown) to maintain the stability of the pressing layer 1 on the printed circuit board. The pressing portion 10 and the extending portion 103 together with a printed circuit board (not shown) constitute a housing space 100, and the housing space 100 can accommodate the inversion sheet 2 that is in contact with the printed circuit board. Opposite sides of the pressing area 10 are oppositely formed with two notch portions 105 for placing LED lamps (not shown), and the LED lamps can be energized and illuminated. The lower surface 102 corresponding to the accommodating space 100 is convexly provided with a pressing column 104. The pressing column 104 is substantially cylindrical and arranged in a regular array. The end of the pressing post 104 can be pasted by a special glue after installation. It is bonded to the reversal film 2, and the reversal of the reversal film 2 is manipulated by external force pressing. After the push button switch is installed, the height of the pressing post 104 is smaller than the height of the lower surface 102 of the pressing portion 10 to the printed circuit board to ensure that the pressing post 104 has sufficient space to resist the reversal film 2. It should be noted by the skilled person that the pressing layer 1 of the push button switch of the present invention is made of a enamel resin material having good light transmittance, and the enamel resin material is used to illuminate the light source. The emitted light is refracted inside the resin by a plurality of times, so that the light is uniformly dispersed on the surface of the enamel resin material, and exhibits good light transmittance and astigmatism, wherein the refractive index of the yttrium resin refracted light is approximately 1.4; The resin material has good elasticity at the same time, and after the molding, the pressing layer 1 formed of the resin material is deformed according to the pressure when subjected to external pressure.

The reversal film 2 is a conductive metal piece having a dome-like structure, and the top of the reversal film 2 can be reversed in the pressure direction when subjected to pressure.

In the embodiment of the push button switch, the protruding side of the reversal film 2 is adhered to the pressing post 104 of the pressing layer 1 with an adhesive glue, as shown in the fifth figure, forming a key combination, and then The button combination cooperates with the printed circuit board to form a keypad. When the user presses the pressing layer 1 of the push button switch, the pressure is transmitted to the reversal film 2 through the pressing post 104, so that the reversal film 2 is reversed and is on the printed circuit board. Fixed contacts (not shown) are in contact with each other.

Referring to FIG. 5 to FIG. 7 , another preferred embodiment of the button switch of the present invention mainly includes the pressing layer 1 and the reversal film 2 described above, and further includes a pressing layer 1 and a reverse layer. The adhesive layer 3 in which the sheets 2 are bonded to each other. The pressing layer 1 and the reversal film 2 are as described above, and the adhesive layer 3 is a bendable sheet coated with adhesive on both sides, and the adhesive layer 3 includes a top surface 31 and a bottom surface 32. a portion of the adhesive layer 3 corresponding to the pressing post 104 of the pressing layer 1 is recessed from the bottom surface 32 toward the top surface 31 and is provided with a through hole 33 penetrating through the adhesive layer 3, and the adhesive layer 3 of the peripheral portion of the through hole 33 is subjected to a preforming process. The periphery of the through hole 33 is formed in the recessed direction of the through hole 33 to form an annular portion 34 which can be closely adhered to the dome-shaped surface of the reversal sheet 2, and the annular portion 34 reversing the dome-shaped surface of the sheet 2 when assembled The adhesive portion is bonded to the annular portion 34 by the adhesive on the annular portion 34. An exhaust hole 35 for exhausting is disposed between adjacent through holes 33, and the exhaust hole is provided 35 is partially penetrated from the annular portion 34, and the vent hole 35 is pressed by the external force when the push button switch is pressed, and when the reversing film 2 is reversed in the direction of the printed circuit board, the space between the reversal film 2 and the printed circuit board can be discharged. And the excess air produced.

When the embodiment of the push button switch is assembled, the dome portion of the reversal film 2 is bonded to the annular portion 34 by the adhesive tape from the bottom surface 32 side of the adhesive layer 3, and the pressing layer 1 is further covered by the top surface 31 of the adhesive layer 3. One side is bonded to the adhesive layer 3; the pressing post 104 of the pressing layer 1 passes through the through hole 33 of the adhesive layer 3, and abuts against the reversal film 2. The push button switch is then assembled on the printed circuit board, and when the user presses the pressing layer 1 of the push button switch, the pressure is transmitted to the reversal film 2 through the pressing post 104, so that the reversal film 2 is reversed and fixed with the printed circuit board. Contacts (not shown) are in contact with each other.

In the above two embodiments, the material of the pressing layer 1 is made of a resin material having good light transmittance by injection molding. The use of a resin material having a good light transmission shape for molding the press layer 1 can eliminate the light-transmitting layer which is specially provided in the prior art for uniformly distributing light in the finished product of the push button switch. On the basis of the first preferred embodiment and the second preferred embodiment, the pressing columns 104 on the pressing layer 1 are directly in contact with the reversing film 2, and the button switch is reduced compared with the prior art. The overall height of 1 is in line with the trend of miniaturization of push button switches.

The technical contents and technical features of the present invention have been disclosed as above, but those skilled in the art can still make various substitutions and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of the invention is not to be construed as limited by the scope of

1‧‧‧ Pressing layer

10‧‧‧ Press zone

100‧‧‧ accommodating space

102‧‧‧lower surface

103‧‧‧Extension

104‧‧‧ Press column

105‧‧‧Gap section

2‧‧‧Reversal film

Claims (6)

A push button switch mainly comprises a pressing layer, an adhesive layer and at least one reversal film, the pressing layer has a pressing area, the pressing area is provided with an upper surface and a lower surface, and the pressing area edge is protruded from the lower surface and is provided with An extension portion, wherein the adhesive layer is provided with a top surface and a bottom surface; the top surface and the bottom surface are provided with through holes, the edges of the through holes are pasted with the reversal film, the pressing layer is adhered to the top surface of the adhesive layer, and the pressing layer has Good light transmission and elasticity, and light can be evenly dispersed on the upper surface of the pressing area by reflection and refraction. When pressing the upper surface, the lower surface directly presses the reversal film, and the pressing layer is provided on opposite sides The notch portion forms a light guiding path between the notch portion and the upper surface of the pressing portion. The push button switch according to claim 1, wherein the lower surface of the pressing portion is provided with a columnar pressing column, and the reversing piece is placed under the pressing column and bonded to the pressing column. The push button switch according to claim 1, wherein the through hole is formed by a bottom surface facing the top surface, and an edge of the through hole forms an annular portion bonded to the reversal piece toward the recessed direction of the through hole. The push button switch according to claim 3, wherein a vent hole for exhausting is provided between the corresponding through holes, and the vent hole and the annular portion are partially penetrated. The push button switch of claim 1, wherein the pressing layer is formed by molding a resin material. The push button switch according to claim 1, wherein the pressing portion and the extending portion constitute a receiving space, and the reversing piece is housed in the receiving space.