CN109451649A - The keyboard pcb and keyboard of chemical erosion influence can be slowed down - Google Patents
The keyboard pcb and keyboard of chemical erosion influence can be slowed down Download PDFInfo
- Publication number
- CN109451649A CN109451649A CN201811141717.2A CN201811141717A CN109451649A CN 109451649 A CN109451649 A CN 109451649A CN 201811141717 A CN201811141717 A CN 201811141717A CN 109451649 A CN109451649 A CN 109451649A
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- China
- Prior art keywords
- layer
- conducting wire
- substrate
- protective layer
- keyboard pcb
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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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 present invention can slow down the keyboard pcb of chemical erosion influence about one kind, and it includes have substrate, conductive layer, protective layer and barrier layer.The conductive layer is located on the substrate.Partially the protective layer is located on the substrate, and another part protective layer covers the conductive layer.The barrier layer has opposite first surface and second surface.The first surface connects the conductive layer, and the second surface connects the protective layer, for preventing chemical substance from penetrating into the gap between the conductive layer and the protective layer.Keyboard pcb of the invention provides multiple-protection using barrier layer, can effectively stop chemical gas to penetrate into and corrode conducting wire.
Description
Technical field
The present invention relates to a kind of printed circuit boards, more particularly to a kind of keyboard pcb that can slow down chemical erosion influence.
Background technique
Keyboard pcb need to meet manufacturer through vulcanization test passes and require, however the conducting wire in printed circuit board, such as
Silver conducting wire, easily during the test because of sulphide staining.For conducting wire once being corroded by sulfide, signal transfer function will
It is greatly affected, printed circuit board loses practical function.Therefore, how to design it is a kind of can by vulcanization test after still keep electricity
The novel keyboard circuit board of property conductive performance, as related industry give priority to one of project.
Summary of the invention
The present invention provides a kind of keyboard pcb that can slow down chemical erosion influence, to solve the above problems.
According to an aspect of the present invention, the present invention proposes a kind of keyboard pcb that can slow down chemical erosion influence, packet
Contain:
Substrate；
Conductive layer is located on the substrate；
A part of protective layer, the protective layer is located on the substrate, and another part of the protective layer covers the conductive layer；
And
Barrier layer, the barrier layer have opposite first surface and second surface, which connects the conductive layer, and
The second surface connects the protective layer, to prevent chemical substance from penetrating into the gap between the conductive layer and the protective layer.
As optional technical solution, also include:
Conducting wire is formed on the substrate, which is arranged the barrier on the substrate via the conducting wire with the protective layer
Layer prevents the chemical substance from touching the conducting wire.
As optional technical solution, also include:
Insulating layer is arranged between the conductive layer and the barrier layer.
As optional technical solution, which has transport properties, which is placed on the conductive layer and the barrier
To avoid short circuit between layer.
As optional technical solution, which can reduce the chemical substance and penetrate into the seam with the action of chemicals
The dosage of gap.
According to another aspect of the present invention, the present invention proposes that another kind can slow down the keyboard pcb of chemical erosion influence,
It includes have:
Substrate；
Protective layer is located on the substrate；
A part of separate layer, the separate layer is located on the substrate, and another part of the separate layer covers the protective layer；
And
Barrier layer, the barrier layer have opposite first surface and second surface, which connects the protective layer, and
The second surface connects the separate layer, to prevent chemical substance from penetrating into the gap between the protective layer and the separate layer.
As optional technical solution, also include:
Conducting wire is formed on the substrate, which is arranged the barrier on the substrate via the conducting wire with the separate layer
Layer prevents the chemical substance from touching the conducting wire.
As optional technical solution, which is made with the separate layer by non-conductive material.
According to another aspect of the present invention, the present invention proposes that another kind can slow down the keyboard pcb of chemical erosion influence,
It includes have:
Substrate, the substrate have outer rim；
Conducting wire is formed on the substrate；And
Barrier layer is arranged on the substrate, and between the outer rim and the conducting wire, to stop chemical substance from the outer rim
The conducting wire is touched into the substrate.
As optional technical solution, which also includes another barrier layer, and two barrier layers are located at
The opposite sides of the conducting wire.
As optional technical solution, also include:
Shielding layer, positioned at the top of the conducting wire and the barrier layer；And
The gap between the substrate and the shielding layer is arranged in packing material, the packing material.
According to another aspect of the present invention, the present invention proposes that another kind can slow down the keyboard pcb of chemical erosion influence,
It includes have:
Substrate；
Conducting wire is formed on the substrate；
Protective layer, setting is on the conducting wire of part；
A part of coating, the coating is located on the conducting wire, and another part of the coating covers the protective layer；
And
Barrier layer is covered on to the barrier layer continuity on the coating and the protective layer, to prevent chemical substance from penetrating into
Gap between the protective layer and the coating.
As optional technical solution, also include:
Separate layer is arranged between the conducting wire and the coating.
According to another aspect of the present invention, the present invention also provides a kind of keyboards comprising any one key described above
Disk circuit board.
In conclusion keyboard pcb of the invention is according to conducting wire and conductive layer, protective layer, separate layer and/or coating
Relative positional relationship, barrier layer is arranged in the approach that nuditing wire communicates with the outside world.In in the related technology, although conductive
Layer has closed nuditing wire and the external world with separation layer stack or protective layer and covering layer stack with protection layer stack or protective layer
The main path communicated, but chemical substance still may touch conducting wire via a little gap.And in the present invention, due to naked
A little gap approach that dew conducting wire communicates with the outside world is equipped with barrier layer, therefore keyboard pcb of the invention can be mentioned using barrier layer
For multiple-protection, it can effectively stop chemical gas to penetrate into and corrode conducting wire.
Below in conjunction with the drawings and specific embodiments, the present invention will be described in detail, but not as a limitation of the invention.
Detailed description of the invention
Fig. 1 is the appearance diagram of the keyboard pcb of one embodiment of the invention；
Fig. 2 is the partial sectional view of the keyboard pcb of first embodiment of the invention；
Fig. 3 is the partial sectional view of the keyboard pcb of second embodiment of the invention；
Fig. 4 is the partial sectional view of the keyboard pcb of third embodiment of the invention；
Fig. 5 is the partial sectional view of the keyboard pcb of fourth embodiment of the invention；
Fig. 6 is the partial sectional view of the keyboard pcb of fifth embodiment of the invention；
Fig. 7 is the partial sectional view of the keyboard pcb of sixth embodiment of the invention；
Fig. 8 is the appearance diagram of the keyboard pcb of another embodiment of the present invention；
Fig. 9 is the part amplification assumption diagram in region shown in Fig. 8；
Figure 10 is the partial sectional view of keyboard pcb shown in Fig. 8.
Specific embodiment
For the present invention aforementioned and other technology contents, feature and effect, following cooperation with reference to schema it is a kind of compared with
In the detailed description of good embodiment, can clearly it present.The direction term being previously mentioned in following embodiment, such as: upper and lower,
It is left and right, front or rear etc., it is only the direction with reference to annexed drawings.Therefore, the direction term used is for illustrating not to be used to limit
The system present invention.
Fig. 1 and Fig. 2 are please referred to, Fig. 1 is the appearance diagram of the keyboard pcb 10 of the embodiment of the present invention, and Fig. 2 is this hair
Partial schematic diagram of the keyboard pcb 10 of bright first embodiment along hatching A-A ' shown in Fig. 1.Keyboard pcb 10 is generally answered
For in the slight keyboard of laptop.Keyboard pcb 10 is designed via particular process sequence, surveys its inner lead in vulcanization
Erosion damage is not easily susceptible to after examination.The keyboard pcb 10 of first embodiment may include substrate 12, conductive layer 14, protective layer 16,
Insulating layer 18, barrier layer 20 and conducting wire 22.As shown in Fig. 2, conducting wire 22 is formed on the substrate 12.Conductive layer 14 is located at part
On conducting wire 22；A part of protective layer 16 is located on conducting wire 22 and another part is covered on conductive layer 14.Therefore, conductive layer
14 are arranged on the substrate 12 with protective layer 16 via conducting wire 22.
As shown in Fig. 2, conductive layer 14 and protective layer 16 imply that conductive layer 14 in the no completely masking conducting wire 22 in its confluce
Gap 24 is formed between protective layer 16, exposes the conducting wire 22 of part.In order to avoid nuditing wire 22 vulcanize test when by
To erosion, barrier layer 20 is arranged between conductive layer 14 and protective layer 16.Barrier layer 20 is usually silver material, has conduction special
Property, thus can by insulating layer 18 be arranged between conductive layer 14 and barrier layer 20, make barrier layer 20 can not directly contact conductive layer 14,
Avoid short circuit.In other words, the first surface 201 (lower surface) of barrier layer 20 can be connected to conductive layer 14 by insulating layer 18,
The second surface 202 (upper surface) opposite with first surface 201 then connects protective layer 16.Barrier layer 20 can be with chemical substance (example
Such as sulfide) effect, reduces or stops the gap 24 between chemical substance infiltration conductive layer 14 and protective layer 16 and touch conducting wire
22。
Referring to Fig. 3, Fig. 3 is office of the keyboard pcb 10 ' along hatching A-A ' shown in Fig. 1 of second embodiment of the invention
Portion's schematic diagram.In second embodiment, with first embodiment have the function of the element structure having the same of identical number and, in
This is not repeated to illustrate.Leading for mutual storehouse is arranged in insulating layer 18 and barrier layer 20 by the keyboard pcb 10 of first embodiment
Between electric layer 14 and protective layer 16.Different from the first embodiment the keyboard pcb 10 ' of second embodiment is by barrier layer
20 ' are arranged at the horizontaol intersection between conductive layer 14 and protective layer 16, imply that the exposed of the directly covering conducting wire 22 of barrier layer 20 '
Part.The first surface 201 ' (side surface) of barrier layer 20 ' is directly connected to conductive layer 14, second surface 202 ' (another side surface)
Connect protective layer 16.Therefore, barrier layer 20 ' can effectively prevent chemical substance and touch conducting wire 22 via gap 24.Barrier layer 20 ' can
For ultraviolet light coating (ultraviolet coating).
Referring to Fig. 4, Fig. 4 is office of the keyboard pcb 10 " along hatching A-A ' shown in Fig. 1 of third embodiment of the invention
Portion's schematic diagram.Keyboard pcb 10 " may include substrate 12, conductive layer 14, protective layer 16 ' and conducting wire 22.Conducting wire 22 is formed in
On substrate 12.Conductive layer 14 is set on the conducting wire 22 of part, and a part of protective layer 16 ' is located on conducting wire 22, and another portion
Divide and is covered on conductive layer 14.Since 14 storehouse conducting wire 22 of conductive layer generates segment difference, the confluce of conductive layer 14 and protective layer 16
There is barish conducting wire 22.Therefore, the partial sector that protective layer 16 ' is located on conductive layer 14 may extend away its length, imply that increasing
The contact area for adding protective layer 16 ' and conductive layer 14 to be overlapped reduces or chemical substance is stopped to penetrate into gap 24 and corrode conducting wire 22.
Referring to Fig. 5, Fig. 5 is office of the keyboard pcb 50 along hatching B-B ' shown in Fig. 1 of fourth embodiment of the invention
Portion's schematic diagram.Keyboard pcb 50 may include having substrate 52, protective layer 54, separate layer 56, barrier layer 58 and conducting wire 60.Conducting wire
60 are formed on substrate 52.Protective layer 54 is arranged on the conducting wire 60 of part.A part of separate layer 56 is arranged on a lead 60,
Another part is covered on protective layer 54.Therefore, protective layer 54 and separate layer 56 are arranged on substrate 52 via conducting wire 60.Barrier
The position that layer 58 overlaps between protective layer 54 and separate layer 56.Protective layer 54 and separate layer 56 are all by non-conductive material system
Make, therefore barrier layer 58 can directly touch protective layer 54 and separate layer 56.In other words, the 581 (following table of first surface of barrier layer 58
Face) protective layer 54 is connected, the second surface 582 (upper surface) opposite with first surface 581 connect separate layer 56.Barrier layer 58 can
Stop chemical substance to penetrate into the gap 62 between protective layer 54 and separate layer 56, prevents chemical substance from contacting exposed conducting wire 60.
Referring to Fig. 6, Fig. 6 is office of the keyboard pcb 50 ' along hatching B-B ' shown in Fig. 1 of fifth embodiment of the invention
Portion's schematic diagram.In the 5th embodiment, with fourth embodiment have the function of the element structure having the same of identical number and, in
This is not repeated to illustrate.Barrier layer 58 is arranged in the protective layer 54 of mutual storehouse and divided by the keyboard pcb 50 of fourth embodiment
Between interlayer 56.Unlike fourth embodiment, the keyboard pcb 50 ' of the 5th embodiment is protecting the setting of barrier layer 58 '
At horizontaol intersection between sheath 54 and separate layer 56, the exposed part of the directly covering conducting wire 60 of barrier layer 58 ' is implied that.Barrier layer
58 ' first surface 581 ' (side surface) is directly connected to protective layer 54, and second surface 582 ' (another side surface) connects separate layer
56.Therefore, barrier layer 58 ' can effectively prevent chemical substance and touch conducting wire 60 via gap 62.Barrier layer 58 ' can apply for ultraviolet light
Layer (ultraviolet coating).
Referring to Fig. 7, Fig. 7 is office of the keyboard pcb 70 along hatching B-B ' shown in Fig. 1 of sixth embodiment of the invention
Portion's schematic diagram.Keyboard pcb 70 may include having substrate 72, conducting wire 74, protective layer 76, coating 78, barrier layer 80 and separating
Layer 82.Conducting wire 74 is formed in the surface (being not limited to upper surface or lower surface) of substrate 72.Protective layer 76 is arranged in part conducting wire 74
On.A part of coating 78 is located on conducting wire 74, and another part is covered on protective layer 76.Separate layer 82 is selectively set
It sets between coating 78 and conducting wire 74 and protective layer 76, therefore separate layer 82 a part of can attach conducting wire 74, and another portion
Divide and attaches protective layer 76.Substrate 72 has height segment difference because overlapping with protective layer 76, therefore meeting between protective layer 76 and coating 78
Form gap 84.The meeting of conducting wire 74 partial denudation via gap.
In order to avoid chemical substance between protective layer 76 and coating 78 penetrate by gap 84, keyboard pcb 70 will be obstructed
It is covered on coating 78 and protective layer 76 to 80 continuity of layer, implies that approach that gap 84 communicates with the outside world because of barrier layer
80 with protective layer 76 is overlapping and coating 78 and protective layer 76 it is overlapping and be closed.Therefore, 80 energy of barrier layer of keyboard pcb 70
Effectively reduce or prevent chemical substance from penetrating into gap 84 and corroding conducting wire 74.
Fig. 8 to Figure 10 is please referred to, Fig. 8 is the appearance diagram of the keyboard pcb 90 of another embodiment of the present invention, and Fig. 9 is
The part amplification assumption diagram in region C shown in Fig. 8, Figure 10 are keyboard pcb 80 shown in Fig. 8 along the partially schematic of hatching D-D '
Figure.Keyboard pcb 90 may include having substrate 92, conducting wire 94, barrier layer 96, shielding layer 98 and packing material 100.Conducting wire 94
It is formed on substrate 92.Barrier layer 96 is arranged on substrate 92 and between conducting wire 94 and the outer rim 102 of substrate 92.Preferably
Under state sample implementation, keyboard pcb 90 can have multiple barrier layers 96, set up separately and exist in several opposite sides of conducting wire 94 or setting
Vulnerable to the particular side of chemical attacks around conducting wire 94.Shielding layer 98 is located at the top of conducting wire 94 and barrier layer 96.Fill material
Material 100 is filled in the gap between substrate 92 and shielding layer 98.Keyboard pcb 90 has hole 104.Keyboard pcb 90 into
When row vulcanization test, the chemical substance for passing through hole 104 can threaten to switch 106 and associated tracks 94.
As shown in Figures 9 and 10, barrier layer 96 is centered around around conducting wire 94, enters outer rim as blocking chemical substance
Barrier after 102.It, can be depending on design requirement shown in the height of barrier layer 96, width and shape embodiment without being limited thereto.Barrier
Layer 96 can stop chemical substance, while its unit-gas content can be also consumed with action of chemicals.It can be seen in fig. 9 that
Qualitative change (indicating it with latticed decorative pattern), barrier layer are occurred close to the side of outer rim 102 by chemical attacks for barrier layer 96
96 close to the other side of conducting wire 94 not by chemical substance, therefore can effectively avoid chemical substance from outer rim 102 enter substrate 92
And corrode conducting wire 94 or switch 106.
According to another aspect of the present invention, the present invention also provides a kind of keyboards comprising any one key described above
Disk circuit board.
In conclusion keyboard pcb of the invention is according to conducting wire and conductive layer, protective layer, separate layer and/or coating
Relative positional relationship, barrier layer is arranged in the approach that nuditing wire communicates with the outside world.In in the related technology, although conductive
Layer has closed nuditing wire and the external world with separation layer stack or protective layer and covering layer stack with protection layer stack or protective layer
The main path communicated, but chemical substance still may touch conducting wire via a little gap.And in the present invention, due to naked
A little gap approach that dew conducting wire communicates with the outside world is equipped with barrier layer, therefore keyboard pcb of the invention is provided using barrier layer
Multiple-protection can effectively stop chemical gas to penetrate into and corrode conducting wire.
By the above detailed description of preferred embodiments, it is intended to more clearly describe feature and spirit of the invention,
And not protection scope of the present invention is limited with above-mentioned disclosed preferred embodiment.On the contrary, its purpose
It is intended to cover various changes and has being arranged in the scope of protection of the claims of the invention to be applied of equality.Cause
This, scope of protection of the claims of the invention should illustrate the most wide explanation of work according to above-mentioned, to cause it to cover institute
Possible change and the arrangement of tool equality.
Claims (14)
1. the keyboard pcb that one kind can slow down chemical erosion influence, which is characterized in that it includes have:
Substrate；
Conductive layer is located on the substrate；
A part of protective layer, the protective layer is located on the substrate, and another part of the protective layer covers the conductive layer；And
Barrier layer, the barrier layer have opposite first surface and second surface, which connects the conductive layer, and this
Two surfaces connect the protective layer, to prevent chemical substance from penetrating into the gap between the conductive layer and the protective layer.
2. keyboard pcb according to claim 1, which is characterized in that also include:
Conducting wire is formed on the substrate, and the conductive layer and the protective layer are arranged on the substrate via the conducting wire, and the barrier layer is anti-
Only the chemical substance touches the conducting wire.
3. keyboard pcb according to claim 1, which is characterized in that also include:
Insulating layer is arranged between the conductive layer and the barrier layer.
4. keyboard pcb according to claim 3, which is characterized in that the barrier layer has transport properties, the insulating layer
It is placed between the conductive layer and the barrier layer to avoid short circuit.
5. keyboard pcb according to claim 1, which is characterized in that the barrier layer can subtract with the action of chemicals
Few chemical substance penetrates into the dosage in the gap.
6. the keyboard pcb that one kind can slow down chemical erosion influence, which is characterized in that it includes have:
Substrate；
Protective layer is located on the substrate；
A part of separate layer, the separate layer is located on the substrate, and another part of the separate layer covers the protective layer；And
Barrier layer, the barrier layer have opposite first surface and second surface, which connects the protective layer, and this
Two surfaces connect the separate layer, to prevent chemical substance from penetrating into the gap between the protective layer and the separate layer.
7. keyboard pcb according to claim 6, which is characterized in that also include:
Conducting wire is formed on the substrate, and the protective layer and the separate layer are arranged on the substrate via the conducting wire, and the barrier layer is anti-
Only the chemical substance touches the conducting wire.
8. keyboard pcb according to claim 6, which is characterized in that the protective layer and the separate layer are by non-conductive material
Production.
9. the keyboard pcb that one kind can slow down chemical erosion influence, which is characterized in that it includes have:
Substrate, the substrate have outer rim；
Conducting wire is formed on the substrate；And
Barrier layer is arranged on the substrate, and between the outer rim and the conducting wire, to stop chemical substance to enter from the outer rim
The substrate and touch the conducting wire.
10. keyboard pcb according to claim 9, which is characterized in that the keyboard pcb also includes another barrier layer,
Two barrier layers are located at the opposite sides of the conducting wire.
11. keyboard pcb according to claim 9, which is characterized in that also include:
Shielding layer, positioned at the top of the conducting wire and the barrier layer；And
The gap between the substrate and the shielding layer is arranged in packing material, the packing material.
12. the keyboard pcb that one kind can slow down chemical erosion influence, which is characterized in that it includes have:
Substrate；
Conducting wire is formed on the substrate；
Protective layer, setting is on the conducting wire of part；
A part of coating, the coating is located on the conducting wire, and another part of the coating covers the protective layer；And
Barrier layer is covered on to the barrier layer continuity on the coating and the protective layer, to prevent chemical substance from penetrating into the guarantor
Gap between sheath and the coating.
13. keyboard pcb according to claim 12, which is characterized in that also include:
Separate layer is arranged between the conducting wire and the coating.
14. a kind of keyboard, which is characterized in that including keyboard pcb described in claim 1-13 any one.
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 true CN109451649A (en) | 2019-03-08 |
| CN109451649B CN109451649B (en) | 2022-06-28 |
Family
ID=65544614
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) |
Cited By (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 |
| CN113395817A (en) * | 2020-03-13 | 2021-09-14 | 重庆达方电子有限公司 | Thin film circuit board |
Citations (4)
| 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 |
| CN107197590A (en) * | 2017-06-21 | 2017-09-22 | 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 (4)
| 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 |
| CN107197590A (en) * | 2017-06-21 | 2017-09-22 | 苏州达方电子有限公司 | Multilayer circuit board |
Cited By (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 |
| CN113395817A (en) * | 2020-03-13 | 2021-09-14 | 重庆达方电子有限公司 | Thin film circuit board |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109451649B (en) | 2022-06-28 |
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