CN109451649B - Keyboard circuit board capable of reducing chemical corrosion influence and keyboard - Google Patents
Keyboard circuit board capable of reducing chemical corrosion influence and keyboard Download PDFInfo
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- CN109451649B CN109451649B CN201811141717.2A CN201811141717A CN109451649B CN 109451649 B CN109451649 B CN 109451649B CN 201811141717 A CN201811141717 A CN 201811141717A CN 109451649 B CN109451649 B CN 109451649B
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- layer
- circuit board
- substrate
- keyboard circuit
- conductive
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/02—Details
Abstract
The invention relates to a keyboard circuit board capable of retarding chemical corrosion influence, which comprises a substrate, a conductive layer, a protective layer and a barrier layer. The conductive layer is located on the substrate. Part of the protective layer is located on the substrate, and the other 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 with the conductive layer, and the second surface is connected with the protective layer, so as to prevent chemical substances from penetrating into a gap between the conductive layer and the protective layer. The keyboard circuit board of the invention provides multiple protection by using the barrier layer, and can effectively prevent chemical gas from permeating and eroding the lead.
Description
Technical Field
The present invention relates to printed circuit boards, and particularly to a keyboard circuit board capable of reducing the influence of chemical corrosion.
Background
The keyboard circuit board is required to be qualified through a vulcanization test so as to meet the requirements of manufacturers, but the wires in the printed circuit board, such as silver wires, are easily polluted by sulfides in the test process. Once the conductive wire is corroded by the sulfide, the signal transmission function of the conductive wire is greatly affected, and the printed circuit board loses the practical function. Therefore, how to design a novel keyboard circuit board capable of maintaining electrical conductivity after passing the vulcanization test is one of the key development issues of the related industries.
Disclosure of Invention
The invention provides a keyboard circuit board capable of alleviating the influence of chemical erosion so as to solve the problems.
According to one aspect of the present invention, a keyboard circuit board for mitigating chemical attack is provided, comprising:
a substrate;
a conductive layer on the substrate;
a protective layer, a part of which is positioned on the substrate and another part of which covers the conductive layer; and
the barrier layer is provided with a first surface and a second surface which are opposite, the first surface is connected with the conductive layer, and the second surface is connected with the protective layer so as to prevent chemical substances from permeating a gap between the conductive layer and the protective layer.
As an optional technical solution, the method further comprises:
the conductive layer and the protective layer are arranged on the substrate through the conducting wire, and the barrier layer prevents the chemical substances from touching the conducting wire.
As an optional technical solution, the method further comprises:
and the insulating layer is arranged between the conductive layer and the barrier layer.
As an alternative solution, the barrier layer has a conductive property, and the insulating layer is disposed between the conductive layer and the barrier layer to avoid short circuits.
As an alternative solution, the barrier layer can interact with the chemical substance to reduce the amount of the chemical substance penetrating into the gap.
According to another aspect of the present invention, another keyboard circuit board for mitigating the effects of chemical attack is provided, which includes:
a substrate;
a protective layer on the substrate;
a separation layer, a portion of the separation layer being on the substrate and another portion of the separation layer covering the protection layer; and
the barrier layer is provided with a first surface and a second surface which are opposite, the first surface is connected with the protective layer, and the second surface is connected with the separation layer so as to prevent chemical substances from permeating into a gap between the protective layer and the separation layer.
As an optional technical solution, the method further comprises:
the protective layer and the separation layer are arranged on the substrate through the conducting wire, and the barrier layer prevents the chemical substances from touching the conducting wire.
As an optional technical solution, the protection layer and the separation layer are made of a non-conductive material.
According to another aspect of the present invention, another keyboard circuit board for mitigating the effects of chemical attack is provided, which includes:
a substrate having an outer edge;
A conductive line formed on the substrate; and
and the barrier layer is arranged on the substrate and positioned between the outer edge and the lead so as to prevent chemical substances from entering the substrate from the outer edge and contacting the lead.
As an optional technical solution, the keyboard circuit board further includes another blocking layer, and the two blocking layers are respectively located on two opposite sides of the wire.
As an optional technical solution, the method further comprises:
a shielding layer located above the conductive line and the blocking layer; and
and the filling material is arranged in a gap between the substrate and the shielding layer.
According to another aspect of the present invention, another keyboard circuit board for mitigating the effects of chemical attack is provided, which includes:
a substrate;
a conductive line formed on the substrate;
a protective layer disposed on a portion of the conductive line;
a cover layer, a part of which is located on the wire and another part of which covers the protective layer; and
and 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.
As an optional technical solution, the method further comprises:
A separation layer disposed between the conductive line and the cover layer.
According to another aspect of the present invention, there is also provided a keyboard comprising any one of the keyboard circuit boards described above.
In summary, the keyboard circuit board of the present invention arranges the barrier layer on the path of the exposed conductive wire communicating with the outside according to the relative position relationship between the conductive wire and the conductive layer, the protective layer, the separation layer and/or the cover layer. In the related art, although the conductive layer and the passivation layer stack, or the passivation layer and the spacer layer stack, or the passivation layer and the cap layer stack have closed the main path of the exposed conductive line to the outside, the chemical substances may still reach the conductive line through some gaps. In the invention, because the barrier layers are arranged in the paths of the gaps between the exposed leads and the outside, the keyboard circuit board can provide multiple protections by using the barrier layers, and can effectively prevent chemical gas from permeating and eroding the leads.
The invention is described in detail below with reference to the drawings and specific examples, but the invention is not limited thereto.
Drawings
Fig. 1 is an external view of a keyboard circuit board according to an embodiment of the invention;
FIG. 2 is a partial cross-sectional view of a keyboard circuit board of a first embodiment of the present invention;
FIG. 3 is a partial cross-sectional view of a keyboard circuit board according to a second embodiment of the present invention;
FIG. 4 is a partial cross-sectional view of a keyboard circuit board of a third embodiment of the present invention;
FIG. 5 is a partial cross-sectional view of a keyboard circuit board of a fourth embodiment of the present invention;
FIG. 6 is a partial cross-sectional view of a keyboard circuit board of a fifth embodiment of the present invention;
FIG. 7 is a partial cross-sectional view of a keyboard circuit board of a sixth embodiment of the present invention;
FIG. 8 is a schematic external view of a keyboard circuit board according to another embodiment of the present invention;
FIG. 9 is an enlarged view of a portion of the area indicated in FIG. 8;
fig. 10 is a partial cross-sectional view of the keyboard circuit board of fig. 8.
Detailed Description
The foregoing and other aspects, features and advantages of the invention will be apparent from the following more particular description of a preferred embodiment, as illustrated in the accompanying drawings. Directional terms as referred to in the following examples, for example: up, down, left, right, front or rear, etc., are referred to only in the direction of the attached drawings. Accordingly, the directional terminology is used for purposes of illustration and is in no way limiting.
Referring to fig. 1 and fig. 2, fig. 1 is an external view of a keyboard circuit board 10 according to an embodiment of the invention, and fig. 2 is a partial view of the keyboard circuit board 10 according to the first embodiment of the invention along a section line a-a' shown in fig. 1. The keyboard circuit board 10 is generally used in a slim keyboard of a notebook computer. The keyboard circuit board 10 is designed by a special process, so that the internal wires thereof are not easily corroded and damaged after the vulcanization test. The keyboard circuit board 10 of the first embodiment may include a substrate 12, a conductive layer 14, a passivation layer 16, an insulating layer 18, a barrier layer 20, and a conductive line 22. As shown in fig. 2, the conductive line 22 is formed on the substrate 12. The conductive layer 14 is located on a portion of the conductive line 22; one portion of the passivation layer 16 is over the conductive line 22 and another portion overlies the conductive layer 14. Thus, the conductive layer 14 and the protective layer 16 are disposed 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 the intersection, i.e., a gap 24 is formed between the conductive layer 14 and the protective layer 16 to expose a portion of the wires 22. To avoid corrosion of the bare wire 22 during the vulcanization test, a barrier layer 20 is disposed between the conductive layer 14 and the protective layer 16. The barrier layer 20 is typically a silver material with conductive properties, so that 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, thereby avoiding short circuits. In other words, a first surface 201 (lower surface) of the barrier layer 20 may be connected to the conductive layer 14 through the insulating layer 18, and a second surface 202 (upper surface) opposite to the first surface 201 is connected to the protection layer 16. The barrier layer 20 may interact with a chemical species (e.g., sulfide) to reduce or block the chemical species from penetrating into the gap 24 between the conductive layer 14 and the protective layer 16 and reaching the conductive line 22.
Referring to fig. 3, fig. 3 is a partial schematic view of a keyboard circuit board 10 'along a section line a-a' shown in fig. 1 according to a second embodiment of the present invention. In the second embodiment, the elements with the same numbers as those in the first embodiment have the same structures and functions, and the description thereof will not be repeated. The keyboard circuit board 10 of the first embodiment disposes the insulating layer 18 and the barrier layer 20 between the conductive layer 14 and the protective layer 16 stacked on each other. Unlike the first embodiment, the keypad circuit board 10 ' of the second embodiment has the barrier layer 20 ' disposed at the horizontal intersection between the conductive layer 14 and the protection layer 16, i.e., the barrier layer 20 ' directly covers the exposed portions of the wires 22. 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. Thus, the barrier layer 20' effectively prevents chemicals from reaching the leads 22 via the slit 24. The barrier layer 20' may be an ultraviolet coating (ultraviolet coating).
Referring to fig. 4, fig. 4 is a partial schematic view of a keyboard circuit board 10 "along the section line a-a' shown in fig. 1 according to a third embodiment of the present invention. The keyboard circuit board 10 "may include a substrate 12, a conductive layer 14, a protective layer 16', and a conductive line 22. The wires 22 are formed on the substrate 12. The conductive layer 14 is disposed on a portion of the conductive line 22, and a portion of the passivation layer 16' is disposed on the conductive line 22 and another portion covers the conductive layer 14. The conductive layer 14 meets the protective layer 16 with a partially exposed conductive line 22 due to the step difference generated by the conductive layer 14 and the stacked conductive line 22. Therefore, the portion of the protective layer 16 'overlying the conductive layer 14 may extend its length, i.e., increase the contact area between the protective layer 16' and the conductive layer 14, and reduce or prevent the penetration of chemicals into the gap 24 to attack the conductive line 22.
Referring to fig. 5, fig. 5 is a partial schematic view of a keyboard circuit board 50 according to a fourth embodiment of the invention along a section line B-B' shown in fig. 1. The keyboard circuit board 50 may include a substrate 52, a passivation layer 54, a spacer layer 56, a barrier layer 58, and a conductive line 60. The conductive line 60 is formed on the substrate 52. The protective layer 54 is disposed on a portion of the conductive line 60. A portion of the spacer layer 56 is disposed over the conductive line 60 and another portion overlies the protective layer 54. Thus, the passivation layer 54 and the spacer layer 56 are disposed on the substrate 52 via the wires 60. The barrier layer 58 is located at an overlap between the protective layer 54 and the spacer layer 56. The passivation layer 54 and the spacer layer 56 are made of non-conductive material, so that the barrier layer 58 can directly contact the passivation layer 54 and the spacer layer 56. In other words, a first surface 581 (lower surface) of barrier layer 58 is connected to passivation layer 54, and a second surface 582 (upper surface) opposite to first surface 581 is connected to spacer layer 56. The barrier layer 58 can block chemicals from penetrating into the gap 62 between the protective layer 54 and the spacer layer 56, preventing chemicals from contacting the exposed conductive lines 60.
Referring to fig. 6, fig. 6 is a partial schematic view of a keyboard circuit board 50 'along a section line B-B' shown in fig. 1 according to a fifth embodiment of the present invention. In the fifth embodiment, the elements with the same numbers as those in the fourth embodiment have the same structures and functions, and the description thereof is not repeated. The keyboard circuit board 50 of the fourth embodiment has a barrier layer 58 disposed between a protective layer 54 and a spacer layer 56 stacked on each other. Unlike the fourth embodiment, the keyboard circuit board 50 ' of the fifth embodiment has the barrier layer 58 ' disposed at the horizontal intersection between the protective layer 54 and the spacer layer 56, i.e., the barrier layer 58 ' directly covers the exposed portions of the wires 60. Barrier layer 58 ' has a first surface 581 ' (the side surface) directly connected to passivation layer 54 and a second surface 582 ' (the other side surface) connected to spacer layer 56. Thus, the barrier layer 58' effectively prevents chemicals from reaching the wire 60 through the slit 62. The barrier layer 58' may be an ultraviolet coating (ultraviolet coating).
Referring to fig. 7, fig. 7 is a partial schematic view of a keyboard circuit board 70 according to a sixth embodiment of the invention along a section line B-B' shown in fig. 1. The keypad circuit board 70 may include a substrate 72, conductive lines 74, a protective layer 76, a cover layer 78, a barrier layer 80, and a spacer layer 82. The wires 74 are formed on a surface (not limited to the upper surface or the lower surface) of the substrate 72. A protective layer 76 is disposed over portions of the wires 74. One portion of the cap layer 78 is located over the conductive line 74 and another portion is covered over the protective layer 76. The separation layer 82 is optionally disposed between the cap layer 78 and the conductive line 74 and the passivation layer 76, such that the separation layer 82 may be partially attached to the conductive line 74 and partially attached to the passivation layer 76. The substrate 72 and the passivation layer 76 have a height difference due to the overlapping, so that a gap 84 is formed between the passivation layer 76 and the cover layer 78. The wires 74 are partially exposed through the slit.
In order to avoid the chemical infiltration from the gap 84 between the protective layer 76 and the cover layer 78, the keypad board 70 continuously covers the barrier layer 80 on the cover layer 78 and the protective layer 76, i.e., the path of the gap 84 to the outside is closed by the overlapping of the barrier layer 80 and the protective layer 76, and the overlapping of the cover layer 78 and the protective layer 76. Thus, the barrier layer 80 of the keyboard circuit board 70 is effective to reduce or prevent chemicals from penetrating into the gaps 84 and attacking the wires 74.
Referring to fig. 8 to 10, fig. 8 is an external view of a keyboard circuit board 90 according to another embodiment of the invention, fig. 9 is a partially enlarged structural view of a region C shown in fig. 8, and fig. 10 is a partial schematic view of the keyboard circuit board 80 shown in fig. 8 along a section line D-D'. The keyboard circuit board 90 may include a substrate 92, conductive traces 94, a barrier layer 96, a shielding layer 98, and a filler material 100. The conductive line 94 is formed on the substrate 92. The barrier layer 96 is disposed on the substrate 92 between the conductive line 94 and the outer edge 102 of the substrate 92. In a preferred embodiment, the keyboard circuit board 90 may have a plurality of barrier layers 96 disposed on opposite sides of the conductive traces 94 or on specific sides of the periphery of the conductive traces 94 that are susceptible to chemical attack. The shielding layer 98 is disposed over the conductive line 94 and the blocking 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. During a vulcanization test of the keyboard circuit board 90, the chemicals that pass through the holes 104 pose a threat to the switches 106 and associated wires 94.
As shown in fig. 9 and 10, the barrier layer 96 surrounds the leads 94 and acts as a barrier to chemicals entering the outer rim 102. The height, width and shape of the barrier layer 96 are not limited to those shown in this embodiment and can be determined according to design requirements. The barrier layer 96 can both block the chemical species and interact with the chemical species to consume its unit gas content. As can be seen from fig. 9, the barrier layer 96 is chemically altered (shown in a grid pattern) by chemical attack on one side thereof adjacent to the outer edge 102, and the barrier layer 96 is not chemically affected on the other side thereof adjacent to the conductive line 94, so that chemical attack on the conductive line 94 or the switch 106 by chemical entering the substrate 92 from the outer edge 102 can be effectively prevented.
According to another aspect of the present invention, there is also provided a keyboard comprising any one of the keyboard circuit boards described above.
In summary, the keyboard circuit board of the present invention arranges the barrier layer on the path of the exposed wires communicating with the outside according to the relative position relationship between the wires and the conductive layer, the passivation layer, the separation layer and/or the cover layer. In the related art, although the conductive layer and passivation layer stack, or the passivation layer and separation layer stack, or the passivation layer and capping layer stack has closed the main path of the exposed conductive line to the outside, the chemical substances may still reach the conductive line through some gaps. In the invention, because the barrier layers are arranged on the paths of the small gaps between the exposed leads and the outside, the keyboard circuit board of the invention utilizes the barrier layers to provide multiple protections, and can effectively prevent chemical gas from permeating and eroding the leads.
The above detailed description of the preferred embodiments is intended to more clearly describe the features and spirit of the present invention, and the scope of the present invention is not limited by the above disclosed preferred embodiments. On the contrary, it is intended to cover various modifications and equivalent arrangements included within the scope of the appended claims. The scope of the invention is therefore to be accorded the broadest interpretation so as to encompass all such modifications and equivalent arrangements as is within the scope of the appended claims.
Claims (13)
1. A keyboard circuit board capable of reducing chemical corrosion influence is characterized by comprising:
a substrate;
a conductive layer on the substrate;
a protective layer, a part of which is positioned on the substrate and another part of which covers the conductive layer; and
the barrier layer is provided with a first surface and a second surface which are opposite, the first surface is connected with the conductive layer, and the second surface is connected with the protective layer so as to prevent chemical substances from permeating a gap between the conductive layer and the protective layer.
2. The keyboard circuit board of claim 1, further comprising:
The conductive layer and the protective layer are arranged on the substrate through the conducting wire, and the barrier layer prevents the chemical substance from touching the conducting wire.
3. The keyboard circuit board of claim 1, further comprising:
and the insulating layer is arranged between the conductive layer and the barrier layer.
4. The keyboard circuit board of claim 3, wherein the barrier layer has conductive properties, and the insulating layer is disposed between the conductive layer and the barrier layer to avoid short circuits.
5. The keyboard circuit board of claim 1, wherein the barrier layer is capable of interacting with the chemical substance to reduce an amount of the chemical substance penetrating into the gap.
6. A keyboard circuit board capable of reducing chemical corrosion influence is characterized by comprising:
a substrate;
a protective layer on the substrate;
a separation layer, a portion of the separation layer being on the substrate and another portion of the separation layer covering the protection layer; and
a barrier layer having a first surface and a second surface opposite to the first surface, the first surface being connected to the passivation layer, and the second surface being connected to the spacer layer to prevent chemical species from penetrating into a gap between the passivation layer and the spacer layer;
The protective layer and the separation layer are arranged on the substrate through the conducting wire, and the barrier layer prevents the chemical substances from touching the conducting wire.
7. The keyboard circuit board of claim 6, wherein the passivation layer and the separation layer are made of non-conductive material.
8. A keyboard circuit board capable of reducing chemical corrosion influence is characterized by comprising:
a substrate having an outer edge;
a conductive line formed on the substrate; and
and the barrier layer is arranged on the substrate and positioned between the outer edge and the lead so as to prevent chemical substances from entering the substrate from the outer edge and contacting the lead.
9. The keyboard circuit board of claim 8, further comprising another barrier layer, wherein the two barrier layers are respectively located on opposite sides of the conductive line.
10. The keyboard circuit board of claim 8, further comprising:
a shielding layer located above the conductive line and the blocking layer; and
and the filling material is arranged in a gap between the substrate and the shielding layer.
11. A keyboard circuit board capable of reducing chemical corrosion influence is characterized by comprising:
A substrate;
a conductive line formed on the substrate;
a protective layer disposed on a portion of the conductive line;
a cover layer, a part of which is located on the wire and another part of which covers the protective layer; and
and 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.
12. The keyboard circuit board of claim 11, further comprising:
a separation layer disposed between the conductive line and the cover layer.
13. A keyboard comprising the keyboard circuit board of any one of claims 1-12.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811141717.2A CN109451649B (en) | 2018-09-28 | 2018-09-28 | Keyboard circuit board capable of reducing chemical corrosion influence and keyboard |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811141717.2A CN109451649B (en) | 2018-09-28 | 2018-09-28 | Keyboard circuit board capable of reducing chemical corrosion influence and keyboard |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109451649A CN109451649A (en) | 2019-03-08 |
| CN109451649B true CN109451649B (en) | 2022-06-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811141717.2A Active CN109451649B (en) | 2018-09-28 | 2018-09-28 | Keyboard circuit board capable of reducing chemical corrosion influence and keyboard |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109451649B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI725750B (en) * | 2020-02-21 | 2021-04-21 | 達方電子股份有限公司 | Membrane circuit board |
| CN113395817B (en) * | 2020-03-13 | 2023-03-24 | 重庆达方电子有限公司 | Thin film circuit board |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1103233A (en) * | 1993-08-26 | 1995-05-31 | 松下电工株式会社 | Method for manufacturing printed circuit board |
| TW477446U (en) * | 2000-07-19 | 2002-02-21 | Mitac Technology Corp | Waterproof keyboard |
| CN201072720Y (en) * | 2006-04-03 | 2008-06-11 | 阿尔卑斯电气株式会社 | Movable contact body used for switch, and switch device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107197590B (en) * | 2017-06-21 | 2019-08-27 | 苏州达方电子有限公司 | Multilayer circuit board |
-
2018
- 2018-09-28 CN CN201811141717.2A patent/CN109451649B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1103233A (en) * | 1993-08-26 | 1995-05-31 | 松下电工株式会社 | Method for manufacturing printed circuit board |
| TW477446U (en) * | 2000-07-19 | 2002-02-21 | Mitac Technology Corp | Waterproof keyboard |
| CN201072720Y (en) * | 2006-04-03 | 2008-06-11 | 阿尔卑斯电气株式会社 | Movable contact body used for switch, and switch device |
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| Publication number | Publication date |
|---|---|
| CN109451649A (en) | 2019-03-08 |
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