TWI792992B - Membrane switch circuit - Google Patents

Abstract

A membrane switch circuit includes an upper insulating substrate, an upper circuit layer formed on a lower surface of the upper insulating substrate, a spacer layer, and an upper adhering layer. The upper adhering layer is adhered between a lower surface of the upper insulating substrate and an upper surface of the spacer layer such that each upper contact of the upper circuit layer is exposed within the corresponding first through hole of the spacer layer and the corresponding second through hole of the upper adhering layer. A fluidic diode structure of the upper adhering layer has a has a first vent formed on an outer edge side of the upper adhering layer and a second vent communicating with an upper air passage of the upper adhering layer. A first fluid resistance of a first flow direction defining from the first vent to the second vent is greater than a second fluid resistance of a second flow direction defining from the second vent to the first vent.

Description

Membrane switch circuit

The present invention relates to a membrane switch circuit, and in particular to a membrane switch circuit with an air channel capable of delaying the entry of external moisture.

The keyboard has become a common input peripheral device on the market. The membrane switch circuit is one of the necessary components of the keyboard.

A general membrane switch circuit includes an upper circuit layer and a lower circuit layer. The upper circuit layer includes a plurality of upper contacts, and the lower circuit layer includes a plurality of corresponding lower contacts. The keyboard includes a plurality of button structures that are arranged on each set of corresponding upper contacts and lower contacts in a manner that can be pressed up and down, and are used to press the upper contacts of the upper circuit layer to contact the corresponding lower contacts. Point, and then generate the corresponding key signal. There is a pre-set space containing air between each set of corresponding upper contacts and lower contacts. When the button structure is pressed, the upper contact will drop and contact the corresponding lower contact. Moreover, when the button structure is not pressed or is released after being pressed, the upper contact will maintain or return to the original height.

Generally speaking, the membrane switch circuit of the prior art utilizes air passages to design a plurality of preset spaces to communicate with the outside atmosphere. With the design of multiple preset spaces connected to the outside atmosphere, when the outside air pressure or temperature changes, the air pressure in the multiple preset spaces will be the same as the outside air pressure, which will not make the upper contact difficult to be pressed. Or it is not easy to return to the original height after being pressed, resulting in poor tactile feeling of the key, or wrong signal of the key.

However, the prior art membrane switch circuit with an air passage cannot effectively prevent foreign matter such as water vapor from entering its interior.

Therefore, one technical problem to be solved by the present invention is to provide a membrane switch circuit for a keyboard with an air passage that can delay the entry of external moisture.

The membrane switch circuit according to a preferred embodiment of the present invention comprises an upper insulating substrate, an upper circuit layer, an isolation layer, an upper bonding layer, a lower insulating substrate, a lower circuit layer and a lower bonding layer. The upper insulating substrate has a first upper surface and a first lower surface. The upper circuit layer is formed on the first lower surface of the upper insulating substrate and includes a plurality of upper contacts. The isolation layer has a second upper surface, a second lower surface and a plurality of first through holes. Each first through hole corresponds to an upper contact. The upper bonding layer has a plurality of second through holes, an upper air channel and a first fluidic diode structure. Each second through hole corresponds to a first through hole. The upper airway communicates with a plurality of second through holes. The upper bonding layer is bonded between the first lower surface of the upper insulating substrate and the second upper surface of the isolation layer, so that each upper contact is exposed to its corresponding first through hole and its corresponding second through hole. inside the hole. The first fluid diode structure has a first vent and a second vent. The first air vent of the first fluid diode structure is formed on the first outer edge side of the upper bonding layer, and the second air vent of the first fluid diode structure communicates with the upper air channel. The first flow direction defines flow from the first vent to the second vent. The second flow direction defines flow from the second vent to the first vent. In particular, the first fluid resistance of the first flow direction is greater than the second fluid resistance of the second flow direction. The lower insulating substrate has a third upper surface and a third lower surface. The lower circuit layer is formed on the third upper surface of the lower insulating substrate and includes a plurality of lower contacts. Each lower contact corresponds to a first through hole. The lower bonding layer has a plurality of third through holes. Each third through hole corresponds to one first through hole. The lower bonding layer is bonded between the second lower surface of the isolation layer and the third upper surface of the lower insulating substrate, so that each lower contact is exposed to its corresponding first through hole and its corresponding third through hole. inside the hole.

In a variation of the membrane switch circuit according to a preferred embodiment of the present invention, the lower bonding layer also has a lower air channel and a second fluid diode structure. The lower air passage communicates with a plurality of third through holes. The second fluid diode structure has a third vent and a fourth vent. The third vent of the second fluid diode structure is formed on the second outer edge side of the lower lamination layer, and the fourth vent of the second fluid diode structure communicates with the lower air channel. The third flow direction defines flow from the third vent to the fourth vent. The fourth flow direction defines flow from the fourth vent to the third vent. In particular, the third fluid resistance of the third flow direction is greater than the fourth fluid resistance of the fourth flow direction.

In another variant of the membrane switch circuit according to the preferred embodiment of the present invention, the upper bonding layer also has a third fluid diode structure. The third fluid diode structure has a fifth vent and a sixth vent. The fifth vent of the third fluid diode structure is connected to the upper vent. The sixth vent of the third fluid diode structure communicates with a designated second through hole in the plurality of second through holes. The fifth flow direction defines flow from the fifth vent to the sixth vent. A sixth flow direction is defined from the sixth vent to the fifth vent. In particular, the fifth fluid resistance of the fifth flow direction is greater than the sixth fluid resistance of the sixth flow direction.

In another modification of the membrane switch circuit according to the preferred embodiment of the present invention, the upper bonding layer also has a fourth fluid diode structure. The fourth fluid diode structure has a seventh vent and an eighth vent. The upper insulating substrate also has first perforations. The isolation layer also has a second perforation. The upper lamination layer also has a third perforation. The lower insulating substrate also has a fourth hole. The lower lamination layer also has a fifth perforation. The first perforation of the upper insulating substrate is aligned with the second perforation of the isolation layer, the third perforation of the upper bonding layer, the fourth perforation of the lower insulating substrate, and the fifth perforation of the lower bonding layer. The seventh vent of the fourth fluid diode structure communicates with the third hole of the upper bonding layer. The eighth vent of the fourth fluid diode structure is connected to the upper vent. The seventh flow direction defines flow from the seventh vent to the eighth vent. The eighth flow direction defines flow from the eighth vent to the seventh vent. In particular, the seventh fluid resistance of the seventh flow direction is greater than the eighth fluid resistance of the eighth flow direction.

Different from the prior art, the membrane switch circuit according to the present invention has an air channel and a fluid diode structure connected to the air channel, which can effectively delay the entry of external moisture into its interior.

The advantages and spirit of the present invention can be further understood through the following detailed description of the invention and the accompanying drawings.

Please refer to FIG. 1 to FIG. 5 , which schematically depict a membrane switch circuit 1 according to a preferred embodiment of the present invention. Fig. 1 schematically shows a membrane switch circuit 1 according to a preferred embodiment of the present invention with a partial expanded view of components and components. FIG. 2 is a partial cross-sectional view along the A-A line after the membrane switch circuit 1 in FIG. 1 is assembled. Fig. 3 is a partial appearance view of the membrane switch circuit 1 according to a preferred embodiment of the present invention after the upper insulating substrate 10 is removed. 4 is a partial appearance view of a modification of the membrane switch circuit 1 according to a preferred embodiment of the present invention after the lower insulating substrate 14 is removed and the third lower surface 142 of the lower insulating substrate 14 faces upward. FIG. 5 is a partial appearance view of another modification of the membrane switch circuit 1 according to a preferred embodiment of the present invention after removing the upper insulating substrate 10 . FIG. 6 is a partial appearance view of another modification of the membrane switch circuit 1 according to a preferred embodiment of the present invention after removing the upper insulating substrate 10 . 7 is another modification of the membrane switch circuit 1 according to a preferred embodiment of the present invention, with the lower insulating substrate 14 removed and the third lower surface 142 of the lower insulating substrate 14 facing upwards. 8 is another modification of the membrane switch circuit 1 according to a preferred embodiment of the present invention, with the lower insulating substrate 14 removed and the third lower surface 142 of the lower insulating substrate 14 facing upwards.

As shown in Fig. 1, Fig. 2 and Fig. 3, the membrane switch circuit 1 according to the preferred embodiment of the present invention comprises an upper insulating substrate 10, an upper circuit layer 11, an isolation layer 12, an upper bonding layer 13, a lower insulating The base material 14 , the lower circuit layer 15 and the lower bonding layer 16 .

The upper insulating substrate 10 has a first upper surface 100 and a first lower surface 102 . The upper circuit layer 11 is formed on the first lower surface 102 of the upper insulating substrate 10 and includes a plurality of upper contacts 112 .

The isolation layer 12 has a second upper surface 120 , a second lower surface 122 and a plurality of first through holes 124 . Each first through hole 124 corresponds to one upper contact 112 . The upper bonding layer 13 has a plurality of second through holes 130 , an upper air channel 131 and a first fluid diode structure 132 . Each second through hole 130 corresponds to one first through hole 124 . The upper air passage 131 communicates with a plurality of second through holes 130 . The upper bonding layer 13 is bonded between the first lower surface 102 of the upper insulating substrate 10 and the second upper surface 120 of the isolation layer 12, so that each upper contact 112 is exposed to its corresponding first through hole 124 and its corresponding second through hole 130 .

The first fluid diode structure 132 has a first vent 1320 and a second vent 1322 . The first vent 1320 of the first fluid diode structure 132 is formed on the first outer edge side 133 of the upper bonding layer 13, and the second vent 1322 of the first fluid diode structure 132 is connected to the upper vent. airway131. The first flow direction defines flow from the first vent 1320 to the second vent 1322 . The second flow direction defines flow from the second vent 1322 to the first vent 1320 . In particular, the first fluid resistance of the first flow direction is greater than the second fluid resistance of the second flow direction. Thereby, the membrane switch circuit 1 according to the present invention can effectively delay the entry of external moisture into its interior.

The lower insulating substrate 14 has a third upper surface 140 and a third lower surface 142 . The lower circuit layer 15 is formed on the third upper surface 140 of the lower insulating substrate 14 and includes a plurality of lower contacts 152 . Each lower contact 152 corresponds to a first through hole 124 . The lower bonding layer 16 has a plurality of third through holes 160 . Each third through hole 160 corresponds to one first through hole 124 . The lower bonding layer 16 is bonded between the second lower surface 122 of the isolation layer 12 and the third upper surface 140 of the lower insulating substrate 14, so that each lower contact 152 is exposed to its corresponding first through hole 124 and its corresponding third through hole 160 .

In a specific embodiment, the upper insulating substrate 10 and the lower insulating substrate 14 can be made of polycarbonate (polycarbonate, PC), polyvinyl chloride (polyvinyl chloride, PVC), polyethylene terephthalate (polyethylene terephthalate) , PET) and other polymer materials.

As shown in FIG. 4 , in a modification of the membrane switch circuit 1 according to a preferred embodiment of the present invention, the lower bonding layer 16 also has a lower air channel 161 and a second fluid diode structure 162 . The lower air passage 161 communicates with a plurality of third through holes 160 . The second fluid diode structure 162 has a third vent 1620 and a fourth vent 1622 . The third vent 1620 of the second fluid diode structure 162 is formed on the second outer edge side 163 of the lower bonding layer 16, and the fourth vent 1622 of the second fluid diode structure 162 is connected to the lower vent. Airway 161. The third flow direction defines the flow from the third vent 1620 to the fourth vent 1622 . The fourth flow direction defines flow from the fourth vent 1622 to the third vent 1620 . In particular, the third fluid resistance of the third flow direction is greater than the fourth fluid resistance of the fourth flow direction. Thereby, the membrane switch circuit 1 according to the present invention can effectively delay the entry of external moisture into its interior.

As shown in FIG. 5 , in another variation of the membrane switch circuit 1 according to a preferred embodiment of the present invention, the upper bonding layer 13 also has a third fluid diode structure 134 . The third fluid diode structure 134 has a fifth vent 1340 and a sixth vent 1342 . The fifth vent 1340 of the third fluid diode structure 134 is connected to the upper vent 131 . The sixth vent 1342 of the third fluid diode structure 134 communicates with a designated second through hole 130 in the plurality of second through holes 130 . The fifth flow direction defines flow from the fifth vent 1340 to the sixth vent 1342 . The sixth flow direction is defined from the sixth vent 1342 to the fifth vent 1340 . In particular, the fifth fluid resistance of the fifth flow direction is greater than the sixth fluid resistance of the sixth flow direction. Thereby, membrane switch circuit 1 according to the present invention can have Effectively delay external moisture from entering its interior.

The membrane switch circuit 1 according to the present invention also has a plurality of perforations formed to match the assembly of the keyboard. Foreign matter such as moisture may also invade the membrane switch circuit 1 according to the present invention from a plurality of holes. As shown in FIG. 6 , in another modification of the membrane switch circuit 1 according to a preferred embodiment of the present invention, the upper bonding layer 13 also has a fourth fluid diode structure 135 . The fourth fluid diode structure 135 has a seventh vent 1350 and an eighth vent 1352 . The upper insulating substrate 10 also has a first hole 104 . The isolation layer 12 also has a second hole 126 . The upper bonding layer 13 also has a third hole 136 . The lower insulating substrate 14 also has a fourth hole 144 . The lower adhesive layer 16 also has a fifth perforation 164 . The first perforation 104 of the upper insulating substrate 10 is bonded with the second perforation 126 of the isolation layer 12, the third perforation 136 of the upper bonding layer 13, the fourth perforation 144 of the lower insulating substrate 14, and the lower bonding layer. The fifth perforation 164 of layer 16 is aligned. The seventh vent 1350 of the fourth fluid diode structure 135 communicates with the third hole 136 of the upper bonding layer 13 . The eighth vent 1352 of the fourth fluid diode structure 135 is connected to the upper vent 131 . The seventh flow direction defines flow from the seventh vent 1350 to the eighth vent 1352 . The eighth flow direction defines flow from the eighth vent 1352 to the seventh vent 1350 . In particular, the seventh fluid resistance of the seventh flow direction is greater than the eighth fluid resistance of the eighth flow direction. Thereby, the membrane switch circuit 1 according to the present invention can effectively delay the entry of external moisture into its interior.

As shown in FIG. 7 , in another variation of the membrane switch circuit 1 according to a preferred embodiment of the present invention, the lower bonding layer 16 also has a fifth fluid diode structure 165 . The fifth fluid diode structure 165 has a ninth vent 1650 and a tenth vent 1652 . The ninth of the fifth fluid diode structure 165 The vent 1650 is connected to the lower air passage 161 . The tenth vent 1652 of the fifth fluid diode structure 165 communicates with a designated third through hole 160 among the plurality of third through holes 160 . The ninth flow direction defines flow from the ninth vent 1650 to the tenth vent 1652 . A tenth flow direction is defined from the tenth vent 1652 to the ninth vent 1650 . In particular, the ninth fluid resistance of the ninth flow direction is greater than the tenth fluid resistance of the tenth flow direction. Thereby, the membrane switch circuit 1 according to the present invention can effectively delay the entry of external moisture into its interior.

As shown in FIG. 8 , in another variation of the membrane switch circuit 1 according to a preferred embodiment of the present invention, the upper insulating substrate 10 also has a first hole 104 . The isolation layer 12 also has a second hole 126 . The upper bonding layer 13 also has a third hole 136 . The lower insulating substrate 14 also has a fourth hole 144 . The lower adhesive layer 16 also has a fifth perforation 164 . The first perforation 104 of the upper insulating substrate 10 is bonded with the second perforation 126 of the isolation layer 12, the third perforation 136 of the upper bonding layer 13, the fourth perforation 144 of the lower insulating substrate 14, and the lower bonding layer. The fifth perforation 164 of layer 16 is aligned. The lower adhesive layer 16 also has a sixth fluid diode structure 166 . The sixth fluid diode structure 166 has an eleventh vent 1660 and a twelfth vent 1662 . The eleventh vent 1660 of the sixth fluid diode structure 166 communicates with the fifth hole 164 of the lower bonding layer 16 . The twelfth vent 1662 of the sixth fluid diode structure 166 is connected to the lower vent 161 . The eleventh flow direction defines flow from the eleventh vent 1660 to the twelfth vent 1662 . The twelfth flow direction defines flow from the twelfth vent 1662 to the eleventh vent 1660 . In particular, the eleventh fluid resistance of the eleventh flow direction is greater than the twelfth fluid resistance of the twelfth flow direction. Thereby, the membrane switch circuit 1 according to the present invention can effectively delay the entry of external moisture into its interior.

In a specific embodiment, the upper bonding layer 13 may be formed of polymer materials such as ultraviolet curable resin, water gel, and silica gel. The upper bonding layer 13 can be formed on the first lower surface 102 of the upper insulating substrate 10 or the second upper surface 120 of the isolation layer 12 in advance. The lower bonding layer 16 may be formed of polymer materials such as ultraviolet curable resin, water glue, and silicon glue. The lower bonding layer 16 can be formed on the third upper surface 140 of the lower insulating substrate 14 or the second lower surface 122 of the isolation layer 12 in advance. Upper air channel 131, lower air channel 161, first fluid diode structure 132, second fluid diode structure 162, third fluid diode structure 134, fourth fluid diode structure 135, fifth fluid diode structure The pole structure 165 and the sixth fluid diode structure 166 can be formed on the upper bonding layer 13 and the lower bonding layer 16 by screen printing process.

Membrane switch circuit 1 according to the present invention comprises above-mentioned first fluid diode structure 132, second fluid diode structure 162, the 3rd fluid diode structure 134, the 4th fluid diode structure 135, the 5th fluid diode structure At least one of the pole structure 165 and the sixth fluid diode structure 166 .

From the above detailed description of the present invention, it can be clearly understood that the membrane switch circuit according to the present invention has an air channel and a fluid diode structure connected to the air channel, which can effectively delay the entry of external moisture into its interior.

Through the above detailed description of the preferred embodiments, it is hoped that the characteristics and spirit of the present invention can be described more clearly, and the aspect of the present invention is not limited by the preferred embodiments disclosed above. On the contrary, the purpose is to cover various changes and equivalent arrangements within the scope of the patent application for the present invention. Therefore, the aspect of the scope of the patent application for the present invention should be interpreted in the broadest way based on the above description, so as to cover all possible changes and equivalent arrangements.

1: Membrane switch circuit 10: Upper insulating substrate 100: first upper surface 102: First lower surface 104: The first hole 11: Upper circuit layer 112: upper contact 12: Isolation layer 120: second upper surface 122: second lower surface 124: the first through hole 126: The second hole 13: Upper bonding layer 130: the second through hole 131: upper airway 132: The first fluid diode structure 1320: First vent 1322:Second vent 133: First outer edge side 134: The third fluid diode structure 1340: Fifth Vent 1342: The sixth vent 135: The fourth fluid diode structure 1350: The seventh vent 1352: Eighth vent 136: The third hole 14: Lower insulating substrate 140: The third upper surface 142: The third lower surface 144: The fourth hole 15: Lower circuit layer 152: lower contact 16: Lower bonding layer 160: The third through hole 161: lower airway 162: Second fluid diode structure 1620: Third Vent 1622: Fourth Vent 163: Second outer edge side 164: fifth hole 165: The fifth fluid diode structure 1650: Ninth Vent 1652: Tenth Vent 166: The sixth fluid diode structure 1660: Eleventh Vent 1662: Twelfth Vent

Fig. 1 is a partial expanded view of elements and components of a membrane switch circuit according to a preferred embodiment of the present invention. Fig. 2 is a partial cross-sectional view along line A-A after the membrane switch circuit in Fig. 1 is assembled. . Fig. 3 is a partial appearance view of the membrane switch circuit according to a preferred embodiment of the present invention after removing the upper insulating substrate. 4 is a partial appearance view of a modification of the membrane switch circuit according to a preferred embodiment of the present invention after removing the lower insulating substrate and turning the third lower surface of the lower insulating substrate upward. Fig. 5 is a partial appearance view of another modification of the membrane switch circuit according to a preferred embodiment of the present invention after removing the upper insulating substrate. Fig. 6 is a partial appearance view of another modification of the membrane switch circuit according to a preferred embodiment of the present invention after removing the upper insulating substrate. 7 is a partial appearance view of another modification of the membrane switch circuit according to a preferred embodiment of the present invention after removing the lower insulating substrate and turning the third lower surface of the lower insulating substrate upward. 8 is a partial appearance view of another modification of the membrane switch circuit according to a preferred embodiment of the present invention after removing the lower insulating substrate and turning the third lower surface of the lower insulating substrate upward.

1: Membrane switch circuit

12: Isolation layer

120: second upper surface

122: second lower surface

124: the first through hole

13: Upper bonding layer

130: the second through hole

131: upper airway

132: The first fluid diode structure

1320: First vent

1322:Second vent

133: First outer edge side

14: Lower insulating substrate

140: The third upper surface

142: The third lower surface

15: Lower circuit layer

152: lower contact

16: Lower bonding layer

160: The third through hole

Claims (7)

A membrane switch circuit comprising: An upper insulating base material has a first upper surface and a first lower surface; an upper circuit layer is formed on the first lower surface and includes a plurality of upper contacts; an isolation layer has a second upper surface Surface, a second lower surface and a plurality of first through holes, each first through hole corresponds to an upper contact; an upper bonding layer has a plurality of second through holes, an upper air channel and a first fluid Diode structure, each second through hole corresponds to a first through hole, the upper air channel communicates with the plurality of second through holes, and the upper bonding layer is bonded to the first lower surface and the second upper surface Between the surfaces, so that each upper contact is exposed in its corresponding first through hole and its corresponding second through hole, the first fluid diode structure has a first vent and a second vent, The first air vent is formed on a first outer edge side of the upper bonding layer, the second air vent communicates with the upper air channel, and a first flow direction is defined to flow from the first air vent to the second air vent. A vent, a second flow direction is defined to flow from the second vent to the first vent, a first fluid resistance of the first flow is greater than a second fluid resistance of the second flow; the insulating base material, It has a third upper surface and a third lower surface; a lower circuit layer is formed on the third upper surface and includes a plurality of lower contacts, and each lower contact corresponds to a first through hole; and a lower bonding The layer has a plurality of third through holes, each third through hole corresponds to a first through hole, and the lower bonding layer is bonded between the second lower surface and the third upper surface, so that each lower The contacts are exposed in their corresponding first through holes and their corresponding third through holes. The membrane switch circuit as described in Claim 1, wherein the lower bonding layer also has a lower air channel and a second fluid diode structure, the lower air channel communicates with the plurality of third through holes, and the second fluid two The polar body structure has a third vent and a fourth vent, the third vent is formed on a second outer edge side of the lower bonding layer, the fourth vent communicates with the lower air passage, A third flow direction is defined to flow from the third air port to the fourth air port, a fourth flow direction is defined to flow from the fourth air port to the third air port, and a third fluid resistance of the third flow direction is greater than A fourth fluid resistance of the fourth flow direction. The membrane switch circuit as described in Claim 1, wherein the upper bonding layer also has a third fluid diode structure, and the third fluid diode structure has a fifth vent and a sixth vent, the The fifth vent is connected to the upper air passage, the sixth vent is connected to a second through hole designated by one of the plurality of second through holes, and a fifth flow direction is defined to flow from the fifth vent to the second through hole. Six air ports, a sixth flow direction defines flow from the sixth air port to the fifth air port, and a fifth fluid resistance of the fifth flow direction is greater than a sixth fluid resistance of the sixth flow direction. The membrane switch circuit as described in Claim 1, wherein the upper bonding layer also has a fourth fluid diode structure, and the fourth fluid diode structure has a seventh vent and an eighth vent, the The upper insulating base material also has a first perforation, the isolation layer also has a second perforation, the upper bonding layer also has a third perforation, and the lower insulating base material also has a fourth perforation, the The lower bonding layer also has a fifth perforation, the first perforation is aligned with the second perforation, the third perforation, the fourth perforation, and the fifth perforation, and the seventh vent is connected to the The third hole, the eighth vent is connected to the upper airway, a seventh flow direction is defined to flow from the seventh vent to the eighth vent, and an eighth flow direction is defined to flow from the eighth vent to the eighth vent In the seventh vent, a seventh fluid resistance of the seventh flow direction is greater than an eighth fluid resistance of the eighth flow direction. A membrane switch circuit comprising: An upper insulating base material has a first upper surface and a first lower surface; an upper circuit layer is formed on the first lower surface and includes a plurality of upper contacts; an isolation layer has a second upper surface surface, a second lower surface, and a plurality of first through holes, each first through hole corresponds to an upper contact; an upper bonding layer has a plurality of second through holes, and each second through hole corresponds to a first through hole A through hole, the upper bonding layer is bonded between the first lower surface and the second upper surface, so that each upper contact is exposed to its corresponding first through hole and its corresponding second through hole Inside; a lower insulating base material, having a third upper surface and a third lower surface; a lower circuit layer, formed on the third upper surface and including a plurality of lower contacts, each lower contact corresponding to a first through holes; and the lower bonding layer, which has a plurality of third through holes, lower air passages and a first fluid diode structure, each third through hole corresponds to a first through hole, and the lower air passages communicate with the plurality of a third through hole, the lower bonding layer is bonded between the second lower surface and the third upper surface, so that each lower contact is exposed to its corresponding first through hole and its corresponding third through hole In the through hole, the first fluid diode structure has a first vent and a second vent, the first vent is formed on an outer edge side of the lower bonding layer, and the second vent It is connected to the lower airway, a first flow direction is defined to flow from the first vent to the second vent, a second flow is defined to flow from the second vent to the first vent, and the first flow direction A first fluid resistance is greater than a second fluid resistance in the second flow direction. The membrane switch circuit as described in Claim 5, wherein the lower bonding layer also has a second fluid diode structure, and the second fluid diode structure has a third vent and a fourth vent, the The third vent is connected to the lower air passage, the fourth vent is connected to a third through hole designated by one of the plurality of third through holes, and a third flow direction is defined to flow from the third vent to the first vent. Four vents, a fourth flow direction defines flow from the fourth vent to the third vent, and a third fluid resistance of the third flow direction is greater than a fourth fluid resistance of the fourth flow direction. The membrane switch circuit as described in Claim 5, wherein the upper bonding layer also has a third fluid diode structure, and the third fluid diode structure has a fifth vent and a sixth vent, the The upper insulating base material also has a first perforation, the isolation layer also has a second perforation, the upper bonding layer also has a third perforation, and the lower insulating base material also has a fourth perforation, the The lower bonding layer also has a fifth perforation, the first perforation is aligned with the second perforation, the third perforation, the fourth perforation, and the fifth perforation, and the fifth vent is connected to the The fifth hole, the sixth vent is connected to the lower airway, a fifth flow direction is defined to flow from the fifth vent to the sixth vent, and a sixth flow direction is defined to flow from the sixth vent to the In the fifth vent, a fifth fluid resistance of the fifth flow direction is greater than a sixth fluid resistance of the sixth flow direction.

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