CN201112212Y - Membrane switch and keyboard with the membrane switch - Google Patents

Abstract

The utility model discloses a membrane switch, comprising a surface layer (110) and a spacer layer (120) combined with the surface layer (110), characterized in that the surface layer (110) faces the spacer layer A conductive region (130) is provided on the surface (111) of (120), and an abdication region (121) is formed in the spacer layer (120), and the abdication region (121) is connected to the conductive region (130). )correspond. The membrane switch according to the utility model has an ultra-thin structure, is easy to carry, and can reduce costs because no additional circuit devices need to be matched.

Description

Membrane switch and keyboard with the membrane switch

technical field

The utility model relates to a keyboard used for communication equipment, and more particularly relates to a membrane switch with a thin structure and a keyboard with the membrane switch.

Background technique

With the continuous development of electronics and communication technologies, the functions of mobile communication products such as mobile phones are gradually enriched and intelligentized. Today, mobile phone products have gradually changed from simple communication tools to mobile functional terminals integrating communication, entertainment, work processing and many other functions. For the convenience of portability and use, small size and ultra-thin have become the new demands of consumers for such products.

So far, there are two main structures for realizing the mobile phone keyboard function: an independent keyboard structure that cooperates with DOME switches to realize the tactile function, and a touch (non-rebound tactile) input structure that uses a touch screen or cooperates with a special electrical induction device. The former structure is generally thicker, and the latter structure needs to be assisted by special electronic devices and circuits, and the implementation cost is relatively high.

Utility model content

The purpose of the utility model is to provide a new type of membrane switch, which has an ultra-thin structure, and does not need to be supplemented with special electronic devices and circuits, and realizes low cost.

According to one aspect of the present invention, a membrane switch is provided, comprising a surface layer and a spacer layer combined with the surface layer, characterized in that the surface of the surface layer facing the spacer layer is provided with conductive A region, a relief region is formed in the spacer layer, and the relief region corresponds to the conductive region.

Preferably, the conductive region includes a conductive layer formed of silver paste.

Preferably, the conductive region includes a first conductive layer and a second conductive layer, which are sequentially formed on the surface of the surface layer, the first conductive layer is a silver paste layer, and the second conductive layer is a carbon paste layer.

Preferably, the surface layer and the spacer layer are formed of PET or PC film.

Preferably, the surface layer and the spacer layer are bonded to each other with an intervening glue layer.

Preferably, the thickness of the adhesive layer is 0.02-0.03 mm, the thickness of the surface layer is 0.08-0.12 mm, and the thickness of the spacer layer is 0.03-0.1 mm.

According to another aspect of the present utility model, a keyboard with a membrane switch is provided, comprising: a PCB with switch pads arranged thereon; a membrane switch combined with the PCB, the membrane switch comprising a surface layer and the The spacer layer combined with the surface layer; the button layer is arranged above the membrane switch and connected with it; it is characterized in that a conductive area is arranged on the surface of the surface layer facing the spacer layer, and the spacer A yield area is formed in the layer, and both the escape area and the conductive area correspond to switch pads on the PCB.

Preferably, the conductive region includes a conductive layer formed of silver paste.

Preferably, the conductive region includes a first conductive layer and a second conductive layer, which are sequentially formed on the surface of the surface layer, the first conductive layer is a silver paste layer, and the second conductive layer is a carbon paste layer.

Preferably, the surface layer and the spacer layer are formed of PET or PC film.

Preferably, the surface layer and the spacer layer are bonded to each other through a first adhesive layer interposed therebetween, and the PCB and the membrane switch are bonded to each other through a second adhesive layer interposed therebetween.

Preferably, the thicknesses of the first and second adhesive layers are both 0.02-0.03 mm, the thickness of the surface layer is 0.08-0.12 mm, and the thickness of the spacer layer is 0.03-0.10 mm.

Preferably, the switch pads are formed by any one of serpentine pads, star pads, concentric circular pads or a combination thereof.

Compared with the switch mode adopted by the keyboard in the prior art, the membrane switch of the utility model has an ultra-thin structure, is easy to carry, and because no additional circuit device is needed, the cost is reduced.

Description of drawings

Through the following detailed description in conjunction with the accompanying drawings, the above and other aspects, features and other advantages of the present utility model will be better understood, in the accompanying drawings:

FIG. 1 is a schematic diagram showing the composition of a membrane switch according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of the membrane switch of FIG. 1 .

Fig. 3 is a cross-sectional view schematically showing the assembly structure of a membrane keyboard with a membrane switch according to an embodiment of the present invention.

FIG. 4 is a schematic diagram showing pad shapes adopted by switch pads of the PCB in FIG. 3 .

Fig. 5 is a cross-sectional view schematically showing the assembly structure of a silicone keyboard with a membrane switch according to another embodiment of the present invention.

Detailed ways

Below in conjunction with accompanying drawing, the specific embodiment of the utility model is described in further detail. However, this invention may be embodied in many different forms and should not be construed as limited to the embodiments presented herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. In the drawings, the same reference numerals denote the same elements.

FIG. 1 is a schematic diagram showing the composition of a membrane switch 10 according to an embodiment of the present invention. FIG. 2 is a cross-sectional view of the membrane switch 10 of FIG. 1 . Referring to FIGS. 1 and 2 , the membrane switch 10 according to this embodiment includes a surface layer 110 and a spacer layer 120 . The surface 111 of the surface layer 110 is provided with a conductive area 130, and when connected to the PCB, the conductive area is used to connect the corresponding circuit on the PCB; the spacer layer 120 has a relief area 121 corresponding to the conductive area 130, the The relief area may be formed through a die-cutting process, and its size is set such that a corresponding portion of the conductive area 130 passes therethrough to contact the PCB and adjust the touch or press sensitivity of the membrane switch. Preferably, the surface layer 110 and the spacer layer 120 can be formed by polyester films such as PET (PolyEthylene Terephthalate, polyethylene terephthalate), PC (polycarbonate, polycarbonate), and the thickness of the surface layer 110 can be 0.08～ 0.12mm, and the thickness of the spacer layer 120 may be 0.03-0.1mm.

Referring to Fig. 2, the conductive region 130 in this embodiment includes a first conductive layer 131 formed by silver paste and a second conductive layer 132 formed by carbon paste, both of which can be formed on the surface layer 110 sequentially by a silk printing process on the surface 111 of the . The silver paste layer is used to reduce the on-resistance, and the carbon paste layer is used to protect the silver paste layer to prevent its oxidation and prolong the service life. Alternatively, the conductive region 130 may include only the first conductive layer (131), and preferably, the first conductive layer may be formed of silver paste. The adhesive layer 150 is provided on the area of the spacer layer 120 except the yield area 121 for bonding the surface layer 110 and the spacer layer 120 to each other. Preferably, the thickness of the adhesive layer 150 is set to be 0.02-0.03 mm. The combined membrane switch 10 is shown in FIG. 1 .

In addition, as shown in FIG. 2 , an adhesive layer 160 is provided on the back of the spacer layer 120 for combining with the corresponding PCB. Preferably, the thickness of the adhesive layer 160 can also be set to 0.02-0.03 mm.

Fig. 3 is a cross-sectional view schematically showing the assembly structure of a membrane keyboard with a membrane switch 10 according to an embodiment of the present invention. FIG. 4 is a schematic diagram illustrating a pad shape adopted by the switch pad 210 of the PCB in FIG. 3 . The membrane keyboard of this embodiment includes a PCB 20 on which a switch pad 210 is arranged, a membrane switch 10 combined with the PCB through an adhesive layer 160, and a membrane keyboard key layer 30 accommodating the PCB 20 and the membrane switch 10, wherein the switch welding The pad 210 corresponds to the conductive region 130 of the membrane switch 10 . As shown in FIG. 4 , the switch pads 210 on the PCB 20 can adopt structures such as serpentine pads 211 , star pads 212 or concentric circular pads 213 . Alternatively, the PCB 20 may use a flexible printed circuit (FPC). In this embodiment, the button layer 30 can be a 0.25-0.5 mm PC or PET material button layer, or a thin film keyboard button layer combined with a rubber layer, or a panel front shell lens integrated The IMD structure forms the keyboard key layer. The thinnest structural thickness of the key layer of the membrane keyboard adopting the methods mentioned above can be only 0.5mm.

According to the keyboard of this embodiment, when the keyboard is in use, the conductive area 130 on the membrane switch 10 can pass through the switch pad 210 on the yielding area 121 and the PCB 20 by gently pressing the mark on the key layer 30 with the finger along the direction of the arrow. are electrically connected to each other, so as to realize the desired function.

Fig. 5 is a cross-sectional view schematically showing the assembly structure of a silicone keyboard with a membrane switch according to another embodiment of the present invention. In this embodiment, the button layer 30 ′ is made of silicone material, and a thin film inclined wall structure 310 ′ is matched thereon, so as to realize a rebound feeling when the keyboard is struck or pressed. The keyboard of this embodiment can be further applied to wider fields such as telephones, and the implementation cost is relatively low.

In summary, since the working stroke of the membrane switch according to the embodiment of the present invention is only about 0.1 mm, the matching keyboard key layer may not need to be equipped with a conductive column structure of a DOME switch, or only need a very low conductive column (such as 0.1 mm), so the structural thickness of the DOME+keyboard key layer in the prior art (currently the thinnest can be about 1mm) can be greatly reduced, and the thinnest can be reduced to about 0.5mm, leaving room for ID and structural design. space. Moreover, in the combined application with a thin-film keyboard, even if a thinner keyboard key layer is used, the keyboard surface can still maintain a flat and beautiful appearance, and the deformation of the keyboard is small, which can significantly prolong its service life.

While the present invention has been described in conjunction with what are presently considered to be practical exemplary embodiments, those skilled in the art will appreciate that the invention is not limited to the disclosed exemplary embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present utility model shall be included in the protection scope of the present utility model.

Claims (13)

1. thin film switch, comprise top layer (110) and the spacer layer (120) that combines with described top layer (110), it is characterized in that, the surface (111) in the face of described spacer layer (120) on described top layer (110) is provided with conduction region (130), be formed with the district (121) that steps down in the described spacer layer (120), the described district (121) that steps down is corresponding with described conduction region (130).

2. thin film switch according to claim 1 is characterized in that, described conduction region (130) comprises the conductive layer (131) that is formed by the silver slurry.

3. thin film switch according to claim 1, it is characterized in that, described conduction region (130) comprises first conductive layer (131) and second conductive layer (132) on the described surface (111) that is formed on described top layer (110) successively, described first conductive layer (131) is a silver slurry layer, and described second conductive layer (132) is carbon slurry layer.

4. thin film switch according to claim 1 is characterized in that, described top layer (110) and described spacer layer (120) are formed by PET or PC film.

5. thin film switch according to claim 1 is characterized in that, described top layer (110) are bonded to each other by intervenient glue-line (150) with described spacer layer (120).

6. thin film switch according to claim 5 is characterized in that, the thickness of described glue-line (150) is 0.02～0.03mm, and the thickness of described top layer (110) is 0.08～0.12mm, and the thickness of described spacer layer (120) is 0.03～0.1mm.

7. keyboard with thin film switch comprises:

PCB (20), it is provided with switch pad (210);

Thin film switch (10) is incorporated on the described PCB (20), and described thin film switch (10) comprises top layer (110) and the spacer layer (120) that combines with described top layer (110);

Key layer (30) is arranged on described thin film switch (10) top and is mated connection; It is characterized in that,

The surface (111) in the face of described spacer layer (120) on described top layer (110) is provided with conduction region (130), be formed with the district (121) that steps down in the described spacer layer (120), described district (121) and the described conduction region (130) of stepping down is all corresponding to the switch pad (210) on the described PCB (20).

8. keyboard according to claim 7 is characterized in that, described conduction region (130) comprises the conductive layer (131) that is formed by the silver slurry.

9. keyboard according to claim 7, it is characterized in that, described conduction region (130) comprises first conductive layer (131) and second conductive layer (132) on the described surface (111) that is formed on described top layer (110) successively, described first conductive layer (131) is a silver slurry layer, and described second conductive layer (132) is carbon slurry layer.

10. keyboard according to claim 7 is characterized in that, described top layer (110) and described spacer layer (120) are formed by PET or PC film.

11. keyboard according to claim 7, it is characterized in that, described top layer (110) is bonded to each other by intervenient first glue-line (150) with described spacer layer (120), and described PCB (20) is bonded to each other by intervenient second glue-line (160) with described thin film switch (10).

12. keyboard according to claim 11, it is characterized in that the thickness of described first and second glue-lines (150,160) is 0.02～0.03mm, the thickness on described top layer (110) is 0.08～0.12mm, and the thickness of described spacer layer (120) is 0.03～0.10mm.

13. keyboard according to claim 7 is characterized in that, described switch pad (210) by snakelike pad (211), star pad (212), circular concentric pad (213) any one or its in conjunction with forming.

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