TWI707610B - Keyboard circuit board capable of preventing chemical erosion - Google Patents

Abstract

A keyboard circuit board capable of preventing chemical erosion can include a substrate, a conduction layer, a protection layer and an isolation layer. The conduction layer is formed on the substrate. A part of the protection layer is disposed on the substrate, and the other part of the protection layer is disposed on the conduction layer. The isolation layer has a first surface and a second surface opposite to each other. The first surface is connected to the conduction layer, and the second surface is connected to the protection layer, so as to prevent chemical substance from leaking into a gap between the conduction layer and the protection layer.

Description

Keyboard circuit board capable of mitigating the influence of chemical corrosion

The present invention provides a printed circuit board, especially a keyboard circuit board that can reduce the influence of chemical corrosion.

The keyboard circuit board must pass the vulcanization test to meet the manufacturer's requirements, but the wires in the printed circuit board, such as silver wires, are easily contaminated by sulfide during the test. Once the wire is corroded by sulfide, its signal transmission function will be greatly affected, and the printed circuit board will lose its actual function. Therefore, how to design a new type of keyboard circuit board that can maintain electrical conductivity after passing the vulcanization test is one of the key development topics of related industries.

The present invention provides a keyboard circuit board that can reduce the influence of chemical corrosion to solve the above-mentioned problems.

The scope of patent application of the present invention discloses a keyboard circuit board that can reduce the influence of chemical corrosion, which includes a substrate, a conductive layer, a protective layer, and a barrier layer. The conductive layer is located on the substrate. A part of the protective layer is on the substrate, and another part of the protective layer covers the conductive layer. The barrier layer has a first surface and a second surface opposite to each other. The first surface is connected to the conductive layer, and The second surface is connected to the protective layer to prevent chemical substances from penetrating into a gap between the conductive layer and the protective layer.

The scope of the patent application of the present invention also discloses a keyboard circuit board that can reduce the influence of chemical corrosion, which includes a substrate, a protective layer, a separation layer and a barrier layer. The protective layer is located on the substrate. Part of the separation layer is on the substrate, and another part of the separation layer covers the protective layer. The barrier layer has a first surface and a second surface opposite to each other. The first surface is connected to the protective layer, and the second surface is connected to the separation layer to prevent chemical substances from penetrating into a gap between the protective layer and the separation layer.

The patent application scope of the present invention also discloses a keyboard circuit board that can reduce the effects of chemical corrosion, which includes a substrate, a wire, and a barrier layer. The substrate has an outer edge. The wire is formed on the substrate. The barrier layer is disposed on the substrate and located between the outer edge and the wire, and is used to block chemical substances from entering the substrate from the outer edge to touch the wire.

The patent application scope of the present invention also discloses a keyboard circuit board that can reduce the effects of chemical corrosion, which includes a substrate, a wire, a protective layer, a covering layer, and a barrier layer. The wire is formed on the substrate. The protective layer is arranged on part of the wire. A part of the covering layer is on the wire, and another part of the covering layer covers the protective layer. The barrier layer continuously covers the covering layer and the protective layer to prevent chemical substances from penetrating into a gap between the protective layer and the covering layer.

In the keyboard circuit board of the present invention, according to the relative positional relationship between the wire and the conductive layer, the protective layer, the separation layer and/or the covering layer, the barrier layer is arranged on the way that the bare wire communicates with the outside. Although the stack of conductive layer and protective layer, or the stack of protective layer and separation layer, or the stack of protective layer and cover layer has been sealed If the exposed wires communicate with the outside, chemical substances may still touch the wires through some gaps. Therefore, the keyboard circuit board of the present invention uses barrier layers to provide multiple protections, which can effectively prevent chemical gases from penetrating and corroding the wires.

10, 10’, 10”: keyboard circuit board

12: substrate

14: conductive layer

16, 16’: protective layer

18: Insulation layer

20, 20’: barrier layer

201, 201’: the first surface of the barrier layer

202, 202’: the second surface of the barrier layer

22: Wire

24: gap

50, 50’: keyboard circuit board

52: substrate

54: protective layer

56: Separation layer

58, 58’: barrier layer

581, 581’: the first surface of the barrier layer

582, 582’: The second surface of the barrier layer

60: Wire

62: Gap

70: keyboard circuit board

72: substrate

74: Wire

76: protective layer

78: Overlay

80: barrier layer

82: Separation layer

84: Gap

90: keyboard circuit board

92: substrate

94: Wire

96: barrier layer

98: Masking layer

100: filling material

102: outer edge of substrate

104: Hole

106: switch

A-A’: Section line

B-B’: Section line

C: area

D-D’: Section line

Figure 1 is a schematic diagram of the appearance of a keyboard circuit board according to an embodiment of the present invention.

Figure 2 is a partial cross-sectional view of the keyboard circuit board of the first embodiment of the present invention.

Figure 3 is a partial cross-sectional view of the keyboard circuit board of the second embodiment of the present invention.

Figure 4 is a partial cross-sectional view of the keyboard circuit board of the third embodiment of the present invention.

Figure 5 is a partial cross-sectional view of the keyboard circuit board of the fourth embodiment of the present invention.

Figure 6 is a partial cross-sectional view of the keyboard circuit board of the fifth embodiment of the present invention.

Figure 7 is a partial cross-sectional view of the keyboard circuit board of the sixth embodiment of the present invention.

FIG. 8 is a schematic diagram of the appearance of a keyboard circuit board according to another embodiment of the present invention.

Figure 9 is a partial enlarged structure diagram of the area shown in Figure 8.

Figure 10 is a partial cross-sectional view of the keyboard circuit board shown in Figure 8.

Please refer to Figures 1 and 2. Figure 1 is a schematic diagram of the appearance of the keyboard circuit board 10 of the embodiment of the present invention, and Figure 2 is the keyboard circuit board 10 of the first embodiment of the present invention along the section line shown in Figure 1 A-A' partial schematic diagram. The keyboard circuit board 10 is generally used in a thin keyboard of a notebook computer. The keyboard circuit board 10 is designed through a special manufacturing process so that its internal wires are not easily damaged by corrosion after the vulcanization test. The keyboard circuit board 10 of the first embodiment may include a substrate 12, a conductive layer 14, a protective layer 16, an insulating layer 18, a barrier layer 20 and wires 22. As shown in FIG. 2, the wires 22 are formed on the substrate 12. The conductive layer 14 is located in part of the conductive On the wire 22; the protective layer 16 is partly located on the wire 22, and the other part is covered on the conductive layer 14. Therefore, the conductive layer 14 and the protective layer 16 are provided on the substrate 12 via the wires 22.

As shown in FIG. 2, the conductive layer 14 and the protective layer 16 do not completely shield the wires 22 at their intersections, which means that a gap 24 is formed between the conductive layer 14 and the protective layer 16, and part of the wires 22 are exposed. In order to prevent the exposed wires 22 from being corroded during the vulcanization test, the barrier layer 20 is disposed between the conductive layer 14 and the protective layer 16. The barrier layer 20 is usually a silver material with conductive properties. Therefore, the insulating layer 18 can be disposed between the conductive layer 14 and the barrier layer 20 so that the barrier layer 20 cannot directly contact the conductive layer 14 to avoid short circuits. In other words, the first surface 201 (upper surface) of the barrier layer 20 can be connected to the conductive layer 14 through the insulating layer 18, and the second surface 202 (lower surface) opposite to the first surface 201 can be connected to the protective layer 16. The barrier layer 20 can interact with chemical substances (such as sulfides) to reduce or prevent chemical substances from penetrating into the gap 24 between the conductive layer 14 and the protective layer 16 to reach the wire 22.

Please refer to FIG. 3, which is a partial schematic diagram of the keyboard circuit board 10' of the second embodiment of the present invention along the section line A-A' shown in FIG. In the second embodiment, the elements with the same number as the first embodiment have the same structure and function, and the description is not repeated here. In the keyboard circuit board 10 of the first embodiment, the insulating layer 18 and the barrier layer 20 are disposed between the conductive layer 14 and the protective layer 16 stacked on each other. Different from the previous embodiment, the keyboard circuit board 10' of the second embodiment has a barrier layer 20' disposed at the intersection between the conductive layer 14 and the protective layer 16, which means that the barrier layer 20' directly covers the conductor 22 The bare part. The first surface 201' (side surface) of the barrier layer 20' is directly connected to the conductive layer 14, and the second surface 202' (the other side surface) is connected to the protective layer 16. Therefore, the barrier layer 20' can effectively prevent chemical substances from contacting the wires 22 through the gap 24. The barrier layer 20' may be an ultraviolet coating (ultraviolet coating).

Please refer to FIG. 4, which is the first view of the keyboard circuit board 10" along the third embodiment of the present invention A partial schematic diagram of the section line A-A' shown. The keyboard circuit board 10" may include a substrate 12, a conductive layer 14, a protective layer 16', and a wire 22. The wire 22 is formed on the substrate 12. The conductive layer 14 is disposed on part of the substrate 12, and the protective layer 16' is partly located on the substrate 12, and the other part covers the conductive layer 14. Due to the step difference generated by the conductive layer 14 stacking the wires 22, there is a part of the exposed wires 22 at the intersection of the conductive layer 14 and the protective layer 16. Therefore, the protective layer 16' is located in the conductive layer Part of the section on the layer 14 can extend its length, which means to increase the contact area between the protective layer 16 ′ and the conductive layer 14 to reduce or prevent the penetration of chemical substances into the gap 24 to corrode the wire 22.

Please refer to FIG. 5. FIG. 5 is a partial schematic diagram of the keyboard circuit board 50 of the fourth embodiment of the present invention along the section line B-B' shown in FIG. The keyboard circuit board 50 may include a substrate 52, a protective layer 54, a separation layer 56, a barrier layer 58 and wires 60. The wire 60 is formed on the substrate 52. The protective layer 54 is provided on part of the wire 60. A part of the separation layer 56 is disposed on the wire 60 and the other part is covered on the protective layer 54. Therefore, the protective layer 54 and the separation layer 56 are provided on the substrate 52 via the wires 60. The barrier layer 58 is located at a position where the protective layer 54 and the separation layer 56 overlap. The protection layer 54 and the separation layer 56 are made of non-conductive materials, so the barrier layer 58 can directly contact the protection layer 54 and the separation layer 56. In other words, the first surface 581 (lower surface) of the barrier layer 58 is connected to the protective layer 54, and the second surface 582 (upper surface) opposite to the first surface 581 is connected to the separating layer 56. The barrier layer 58 prevents chemical substances from penetrating into the gap 62 between the protective layer 54 and the separation layer 56, and prevents chemical substances from contacting the exposed wires 60.

Please refer to FIG. 6, which is a partial schematic diagram of the keyboard circuit board 50' of the fifth embodiment of the present invention along the section line B-B' shown in FIG. In the fifth embodiment, the elements with the same number as the fourth embodiment have the same structure and function, and the description will not be repeated here. In the keyboard circuit board 50 of the fourth embodiment, the barrier layer 58 is disposed between the protective layer 54 and the separation layer 56 stacked on each other. Different from the previous embodiment, the keyboard circuit board 50' of the fifth embodiment has the barrier layer 58' arranged at the horizontal intersection between the protective layer 54 and the separation layer 56, which means that the barrier layer 58' directly covers the wires 60 The bare part. The first surface of barrier layer 58' The 581' (side surface) is directly connected to the protective layer 54, and the second surface 582' (the other side surface) is connected to the separation layer 56. Therefore, the barrier layer 58' can effectively prevent chemical substances from reaching the wire 60 through the gap 62. The barrier layer 58' may be an ultraviolet coating (ultraviolet coating).

Please refer to FIG. 7, which is a partial schematic diagram of the keyboard circuit board 70 of the sixth embodiment of the present invention along the section line B-B' shown in FIG. 1. The keyboard circuit board 70 may include a substrate 72, wires 74, a protective layer 76, a cover layer 78, a barrier layer 80, and a separation layer 82. The wire 74 is formed on the surface of the substrate 72 (not limited to the upper surface or the lower surface). The protective layer 76 is provided on part of the wire 74. The covering layer 78 is partly located on the wire 74 and the other part is covering the protective layer 76. The separation layer 82 is selectively disposed between the cover layer 78 and the wires 74 and the protective layer 76, so the separation layer 82 can partially attach the wires 74 and the other portion of the protective layer 76. Since the substrate 72 and the protective layer 76 overlap, there is a height section, so a gap 84 is formed between the protective layer 76 and the covering layer 78. The wire 74 is partially exposed through the gap.

In order to prevent chemical substances from penetrating from the gap 84 between the protective layer 76 and the cover layer 78, the keyboard circuit board 70 continuously covers the barrier layer 80 on the cover layer 78 and the protective layer 76, which means that the gap 84 is in the same way as the outside. It has been closed for the overlap of the barrier layer 80 and the protective layer 76 and the overlap of the cover layer 78 and the protective layer 76. Therefore, the barrier layer 80 of the keyboard circuit board 70 can effectively reduce or prevent chemical substances from penetrating into the gap 84 and corroding the wires 74.

Please refer to Figs. 8-10. Fig. 8 is a schematic diagram of the appearance of a keyboard circuit board 90 according to another embodiment of the present invention. Fig. 9 is a partial enlarged structural view of area C shown in Fig. 8, and Fig. 10 It is a partial schematic diagram of the keyboard circuit board 80 shown in FIG. 8 along the section line D-D'. The keyboard circuit board 90 may include a substrate 92, wires 94, a barrier layer 96, a shielding layer 98 and a filling material 100. The wire 94 is formed on the substrate 92. The barrier layer 96 is disposed on the substrate 92 and between the wire 94 and the outer edge 102 of the substrate 92. Under the preferred implementation, The keyboard circuit board 90 may have a plurality of barrier layers 96, which are separately arranged on several opposite sides of the wires 94, or arranged on specific sides around the wires 94 that are easily corroded by chemicals. The shielding layer 98 is located above the wire 94 and the barrier layer 96. The filling material 100 fills the gap between the substrate 92 and the shielding layer 98. The keyboard circuit board 90 has a hole 104. When the keyboard circuit board 90 is undergoing a vulcanization test, the chemicals passing through the hole 104 will threaten the switch 106 and the related wires 94.

As shown in FIGS. 9 and 10, the barrier layer 96 surrounds the wire 94 as a barrier to prevent chemical substances from entering the outer edge 102. The height, width, and shape of the barrier layer 96 are not limited to those shown in this embodiment, and depend on design requirements. The barrier layer 96 can not only stop the chemical substance, but also interact with the chemical substance at the same time to consume its unit gas content. It can be seen from Figure 9 that the side of the barrier layer 96 close to the outer edge 102 is corroded by chemical substances and undergoes qualitative change (indicated by a grid pattern), and the other side of the barrier layer 96 close to the wire 94 is not affected by the chemical substances Therefore, it can effectively prevent chemicals from entering the substrate 92 from the outer edge 102 to corrode the wire 94 or the switch 106.

To sum up, the keyboard circuit board of the present invention arranges the barrier layer on the path through which the exposed wires communicate with the outside according to the relative positional relationship between the wires and the conductive layer, the protective layer, the separation layer and/or the covering layer. Although the stack of the conductive layer and the protective layer, or the stack of the protective layer and the separation layer, or the stack of the protective layer and the cover layer has closed the exposed wire from communicating with the outside, the chemical substance may still touch the wire through some gaps, so the present invention The keyboard circuit board uses a barrier layer to provide multiple protections, which can effectively prevent chemical gases from penetrating and corroding wires.

The foregoing descriptions are only preferred embodiments of the present invention, and all equivalent changes and modifications made in accordance with the scope of the patent application of the present invention shall fall within the scope of the present invention.

10: Keyboard circuit board

12: substrate

14: conductive layer

16: protective layer

18: Insulation layer

20: barrier layer

201: The first surface of the barrier layer

202: The second surface of the barrier layer

22: Wire

24: gap

Claims (13)

A keyboard circuit board capable of mitigating the effects of chemical corrosion, comprising: a substrate; a conductive layer on the substrate; a protection layer, part of the protection layer is on the substrate, and another part of the protection A layer covering the conductive layer; and a barrier layer having a first surface and a second surface opposite to each other, the first surface is connected to the conductive layer, and the second surface is connected to the protective layer to prevent chemicals from penetrating into the conductive layer A gap with the protective layer. The keyboard circuit board of claim 1, further comprising: a wire formed on the substrate, the conductive layer and the protective layer are disposed on the substrate via the wire, and the barrier layer prevents the chemical substance from touching the wire . The keyboard circuit board according to claim 1, further comprising: an insulating layer disposed between the conductive layer and the barrier layer. The keyboard circuit board according to claim 3, wherein the barrier layer has conductive properties, and the insulating layer is placed between the conductive layer and the barrier layer to avoid short circuits. The keyboard circuit board according to claim 1, wherein the barrier layer acts on the chemical substance to reduce the amount of the chemical substance that penetrates into the gap. A keyboard circuit board capable of mitigating the effects of chemical erosion, comprising: a substrate; a protective layer on the substrate; a separation layer, part of the separation layer is on the substrate, and another part of the separation A layer covering the protective layer; and a barrier layer having a first surface and a second surface opposite to each other, the first surface is connected to the protective layer, and the second surface is connected to the separation layer to prevent chemical substances from penetrating into the protective layer A gap between the separation layer. The keyboard circuit board according to claim 6, further comprising: a wire formed on the substrate, the protective layer and the separation layer are disposed on the substrate via the wire, and the barrier layer prevents the chemical substance from touching the wire . The keyboard circuit board according to claim 6, wherein the protective layer and the separation layer are made of non-conductive materials. A keyboard circuit board capable of mitigating the effects of chemical corrosion, comprising: a substrate having an outer edge; a wire formed on the substrate; and a barrier layer disposed on the substrate and located between the outer edge and the wire In between, the chemical substance is prevented from entering the substrate from the outer edge to touch the wire. The keyboard circuit board according to claim 9, wherein the keyboard circuit board further includes at least two barrier layers, respectively located on two opposite sides of the wire. The keyboard circuit board according to claim 9, further comprising: a shielding layer located above the wire and the barrier layer; and a filling material provided in a gap between the substrate and the shielding layer. A keyboard circuit board capable of mitigating the effects of chemical corrosion, comprising: a substrate; a wire formed on the substrate; a protective layer arranged on a part of the wire; a covering layer and a part of the covering layer The covering layer is located on the wire and another part of the covering layer covers the protective layer; and a barrier layer continuously covers the covering layer and the protective layer to prevent chemical substances from penetrating between the protective layer and the covering layer Of a gap. The keyboard circuit board according to claim 12 further includes: a separation layer arranged between the wire and the covering layer.

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