CN1153234C - Thin-film circuit board for keyboard - Google Patents
Thin-film circuit board for keyboard Download PDFInfo
- Publication number
- CN1153234C CN1153234C CNB001203827A CN00120382A CN1153234C CN 1153234 C CN1153234 C CN 1153234C CN B001203827 A CNB001203827 A CN B001203827A CN 00120382 A CN00120382 A CN 00120382A CN 1153234 C CN1153234 C CN 1153234C
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- circuit
- circuit board
- airway
- layer
- film switch
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Abstract
The present invention relates to a thin-film circuit board for a keyboard, which comprises a thin-film switch circuit and a rowed line structure, wherein the thin-film switch circuit is used for generating key signals; the rowed line structure is connected with the thin-film switch circuit and is used for transferring the key signals generated by the thin-film switch circuit. The thin-film switch circuit comprises a plurality of preset spaces with air and a plurality of first air conduits which are connected with a plurality of preset spaces. The rowed line structure comprises at least one second air conduit which is used for connecting external atmosphere with the first air conduits so that air in the preset spaces is mutually circulated with the outside atmosphere through the first air conduits and the second air conduit so as to adjust air pressure in the preset spaces and enhance the water resistance of the thin-film switch circuit.
Description
The present invention relates to a kind of film circuit board that is used for computor-keyboard, particularly relate to a kind of circuit board that utilizes winding displacement to come exhaust.
See also Fig. 1 and Fig. 2, Fig. 1 is the schematic diagram that available circuit plate 10 is used in a computor-keyboard 12, and Fig. 2 is the structural representation of circuit board 10 shown in Figure 1.Circuit board 10 is used in computor-keyboard 12 and is used for producing push button signalling.Computor-keyboard 12 includes a pedestal 14, and a plurality of press-key structure 16.Circuit board 10 is arranged between pedestal 14 and a plurality of press-key structure 16.Circuit board 10 includes a film switch circuit 18, is used for producing push button signalling.Film switch circuit 18 includes circuit layer 22 on, and circuit layer 24 once.
As shown in Figure 2, last circuit layer 22 includes a plurality of upper contacts 26, and following circuit layer 24 includes corresponding a plurality of contact 28 down.Press-key structure 16 is to be located on the corresponding up and down contact 26,28 of each group in the mode that can press up and down, and the upper contact 26 that is used for pressing circuit layer 22 to be contacting contact 28 corresponding time, and produces corresponding push button signalling.Up and down 26,28 of contacts have one comprise air preset space 30.When press-key structure 16 was pressed, upper contact 26 meeting declines and contact be contact 28 down, and when press-key structure 16 was not pressed or presses back quilt relieving, former height can be kept or return back to upper contact 26.
Generally speaking, the time there are two kinds of selections in the space 30 of presetting of above-mentioned available circuit plate 10 in design, and one for will preset the kenel that space 30 is designed to seal, and one is to utilize airway will preset space 30 to be designed to the kenel that communicates with ambient atmosphere.To preset space 30, to be designed to case type advantage be can block extraneous dust, impurity or aqueous vapor to enter and preset space 30, to increase the service life, its shortcoming is when extraneous atmospheric pressure or temperature change to some extent, the design of this kind sealing kenel may make upper contact 26 be difficult for being pressed, or the former height of difficult answer after pressing, and cause the button sense of touch not good, or the situation of push button signalling mistake.Be designed to just in time on the contrary with the communicate pluses and minuses of kenel of ambient atmosphere with presetting space 30, it does not worry the unbalanced problem of air pressure, but can't effectively block entering of foreign matter.
See also Fig. 3.Fig. 3 is the schematic diagram of another kind of available circuit plate 32.Another kind of available circuit plate 32 can solve the above problems.As shown in Figure 3, a plurality of airways 33 of available circuit plate 32 are to connect an intestines shape air flue 34, communicate with ambient atmosphere so that preset space 30.Compare with the design that only has airway 33 merely, intestines shape air flue 34 has preferable barriering effect, presets in the space 30 so foreign matter and aqueous vapor are not easy to enter.
Yet no matter be simple airway 33 or intestines shape air flue 34, its opening all is to be positioned on the film switch circuit 18, presets space 30 so foreign matter and aqueous vapor still might enter.For instance, when the user sprinkles hot drink to film switch circuit 18 because of carelessness (this is one of project of the abominable use test of keyboard), the air that presets in the space 30 can be discharged because of the relation of thermal expansion, and when it cools off gradually, air can be back to again and preset space 30, and liquid was inhaled into along band probably and preset in the space 30 this moment.Therefore, the design of the airway of available circuit plate 10,32 still can't be satisfied user's demand fully.
The object of the present invention is to provide a keyboard pcb, it not only can adjust the air pressure that presets the space in response to the variation of ambient pressure, and can prevent effectively that extraneous foreign matter from entering and preset the space, to address the above problem.
The object of the present invention is achieved like this, and a kind of film circuit board promptly is provided, and this film circuit board includes: circuit layer on, and it includes at least one upper contact; Circuit layer once, it includes at least one and the corresponding contact down of this upper contact, wherein this time circuit layer is arranged at the below of circuit layer on this, therefore and form a space of presetting that comprises air up and down between contact at this, actuatable this upper contact of this press-key structure to be contacting corresponding down contact, and therefore produces this push button signalling; At least one first airway is between this upper and lower circuit layer and preset the space with this and communicate; And at least one bus-bar construction, be connected in this film switch circuit and protrude from outside this film switch circuit, be used for exporting the push button signalling that this film switch circuit produces, this bus-bar construction includes at least one second airway, and an end of this second airway communicates with ambient atmosphere; Wherein this first airway communicates with the other end of this second airway, and therefore this air that presets in the space can be circulated mutually via this first and second airway with ambient atmosphere.
The advantage of apparatus of the present invention is, it is provided with a plurality of spaces of presetting on circuit layer, it communicates with ambient atmosphere by airway, can adjust the air pressure that presets in the space, and increase film switch circuit water proofing property, this installs low cost of manufacture, good waterproof performance and can also prevent that other material enters and preset the space.
Below in conjunction with accompanying drawing, describe embodiments of the invention in detail, wherein;
Fig. 1 is used in the schematic diagram of a computor-keyboard for the available circuit plate;
Fig. 2 is the structural representation of circuit board shown in Figure 1;
Fig. 3 is the schematic diagram of another kind of available circuit plate;
Fig. 4 is used in the schematic diagram of a computor-keyboard for circuit board of the present invention;
Fig. 5 is the exploded view of circuit board shown in Figure 4;
Fig. 6 is the cutaway view of bus-bar construction shown in Figure 5 along hatching line A-A;
Fig. 7 A is the schematic diagram that bus-bar construction shown in Figure 4 is connected to film switch circuit;
Fig. 7 B is that bus-bar construction shown in Fig. 7 A is along the cutaway view of hatching line B-B;
Fig. 8 A to Fig. 8 C forms the schematic diagram of other embodiment of second airway for the present invention.
See also Fig. 4, Fig. 4 is used in the schematic diagram of a computor-keyboard 52 for circuit board 50 of the present invention.Circuit board 50 is used in computor-keyboard 52 and is used for producing push button signalling.Computor-keyboard 52 includes a pedestal 54, and a plurality of press-key structure 56, and circuit board 50 is arranged between pedestal 54 and a plurality of press-key structure 56.Circuit board 50 includes a film switch circuit 58 and is used for producing push button signalling, an and bus-bar construction 60, be connected in film switch circuit 58, and protrude from outside the film switch circuit 58, be used for the push button signalling that film switch circuit 58 produces is transferred to a signal receiving device 62.
See also Fig. 5.Fig. 5 is the exploded view of circuit board 50 shown in Figure 4.The film switch circuit 58 of circuit board 50 includes circuit layer 64 on, and once circuit layer 66, and a plurality of first airway 74 is between upper and lower circuit layer 64,66.Last circuit layer 64 includes the downside that a plurality of upper contacts 68 are positioned at circuit layer 64, and following circuit layer 66 includes a plurality of corresponding contacts 70 down.Following circuit layer 66 is arranged at the below of circuit layer 64, and therefore presets space 72 in 68,70 formation one of the corresponding contact up and down of each group.A plurality of first airways 74 are used for making a plurality of spaces 72 of presetting to communicate.Film switch circuit 58 includes an interval insulant 76 in addition and is located between the upper and lower circuit layer 64,66, is used for forming a plurality of space 72 and a plurality of first airways 74 of presetting.Press-key structure 56 actuatable upper contacts 68 shown in Figure 4 to be contacting corresponding down contact 70, and therefore produce push button signalling.This push button signalling can transfer to signal receiving device 62 via bus-bar construction 60, for further processing.Bus-bar construction 60 includes one first link 78 and is connected in film switch circuit 58, and one second link 80 is connected in signal receiving device 62.
See also Fig. 6.Fig. 6 is the cutaway view of bus-bar construction 60 shown in Figure 5 along hatching line A-A.Bus-bar construction 60 includes a winding displacement layer 84, and a diaphragm 86 is covered on the winding displacement layer 84.Winding displacement layer 84 includes a basement membrane 88, and many conductor structures 90 are arranged on the basement membrane 88.Winding displacement layer 84 is formed in one with the following circuit layer 66 of film switch circuit 58.Basement membrane 88 includes a upper surface 92, and conductor structure 90 protrudes from upper surface 92, and therefore in a plurality of second airways 82 of side (between winding displacement layer 84 and the diaphragm 86) formation of conductor structure 90.Second airway 82 extends to second link 80 from first link 78 shown in Figure 5, is used for connecting first airway 74 and the ambient atmosphere, and the air that presets in the space 72 can be circulated with ambient atmosphere mutually via first and second airway 74,82.
As shown in Figure 6, conductor structure 90 includes a conductor 94 and is used for transmitting this push button signalling, and an insulating barrier 96 is located at the outside of conductor 94.Conductor 94 can be a silver or carbonaceous lead, or other are single or mix conductors of kenel, as the silver lead that covers the carbonaceous conductor outward etc.
See also Fig. 7 A and Fig. 7 B.Fig. 7 A is the schematic diagram that bus-bar construction 60 shown in Figure 4 is connected to film switch circuit 58.Fig. 7 B is that bus-bar construction 60 shown in Fig. 7 A is along the cutaway view of hatching line B-B.Shown in Fig. 7 A, 7B, the diaphragm 86 of bus-bar construction 60 stretches into 64,66 on the upper and lower circuit layer of film switch circuit 58.Circuit board 50 includes an adhesive layer 98 in addition between upper and lower circuit layer 64,66, and goes up between circuit layer 64 and the diaphragm 86.Adhesive layer 98 has all glue mouths 100.Cut glue mouth 100 and cross over the both sides 102,104 of conductor structure 90a and the side 106 of conductor structure 90b, thus make second airway 82 in conductor structure 90a both sides 102,104 and conductor structure 90b one side 106 places communicate with first airway 74.In addition, second airway 82 also in conductor structure 90a both sides 108,110 and conductor structure 90b one side 112 places communicate with ambient atmosphere.Thus, film switch circuit 58 presets space 72 and can reach the purpose of exhaust via first and second airway 74,82.
Because second airway 82 carries out exhaust action (being the side 108,110,112 of conductor structure 90) in second link 80, second link 80 is very far away apart from film switch circuit 58, so when cold and hot liquids sprinkled to film switch circuit 58 bodies, liquid can't be back to via second link and preset in the space.In addition, because second airway 82 of the present invention directly forms by the height of conductor structure 90, only conductor structure 90 must be added during making and print off enough height and get final product, so very easy in the making.
See also Fig. 8 A to Fig. 8 C.Fig. 8 A to Fig. 8 C forms the schematic diagram of other embodiment of second airway 82 for the present invention.Shown in Fig. 8 A, in adjacent two conductor structures 90 of the present invention, wherein the insulating barrier 96 of a conductor structure 90 can cover conductor 94 fully, also can reach the purpose that forms second airway 82.Shown in Fig. 8 B, but second airway 82 of the present invention also simplex be formed between insulating barrier 96 and the diaphragm 86.In fact, as long as winding displacement layer 84 is rough form, can between winding displacement layer 84 and diaphragm 86, form second airway 82.
In addition, second airway 82 of the present invention also can be formed between whole winding displacement layer 84 and the diaphragm 86.Shown in Fig. 8 C, diaphragm 86 only is provided with adhesive layer 110 in its both sides, and cuts glue mouth 110 and run through adhesive layer 98.Thus, cutting between glue mouth 100 and below winding displacement layer 84 and the diaphragm 86 of Fig. 8 C all can be used as second airway 82.
The above embodiment is illustrated with winding displacement layer 84 and following circuit layer 66 example that is formed in one.In fact, winding displacement layer 84 also can be formed in one with last circuit layer 64, or bus-bar construction 60 includes two winding displacement layers 84, and this two winding displacements layer 84 is formed in one with upper and lower circuit layer 64,66 respectively.The bus-bar construction of these kenels also can aforementioned manner form second airway 82 of the present invention.
Compare with existing keyboard pcb 10,32, circuit board 50 of the present invention has second airway of being located in the bus-bar construction 60 82, improves film switch circuit 58 body water proofing properties and the purpose of regulating the air pressure that presets space 72 so can reach simultaneously.In addition, second airway 82 of the present invention is structures of utilizing existing winding displacement, only must adjust the printing height of conductor structure during manufacturing, and produces the suitable glue mouth 100 of cutting and get final product, and manufacturing cost is also quite cheap.
The above only is preferred embodiment of the present invention, and all equalizations of doing by claim of the present invention change and modify, and all should belong to the covering scope of patent of the present invention.
Claims (9)
1. film circuit board, this film circuit board includes:
Circuit layer on one, it includes at least one upper contact;
Circuit layer once, it includes at least one and the corresponding contact down of this upper contact, wherein this time circuit layer is arranged at the below of circuit layer on this, therefore and form a space of presetting that comprises air up and down between contact at this, actuatable this upper contact of this press-key structure to be contacting corresponding down contact, and therefore produces this push button signalling;
It is characterized in that this film circuit board also comprises:
At least one first airway is between this upper and lower circuit layer and preset the space with this and communicate; And
At least one bus-bar construction, be connected in this film switch circuit and protrude from outside this film switch circuit, be used for exporting the push button signalling that this film switch circuit produces, this bus-bar construction includes at least one second airway, and an end of this second airway communicates with ambient atmosphere;
Wherein this first airway communicates with the other end of this second airway, and therefore this air that presets in the space can be circulated mutually via this first and second airway with ambient atmosphere.
2. circuit board as claimed in claim 1, wherein this bus-bar construction includes one first link and is connected in this film switch circuit, and one second link be connected in this signal receiving device, this second airway extends to this second link by this first link, and communicates with ambient atmosphere in this second link place.
3. circuit board as claimed in claim 1, wherein this bus-bar construction includes a winding displacement layer, and a diaphragm covers on this winding displacement layer, and this winding displacement layer is uneven, and therefore this second airway of formation between this winding displacement layer and this diaphragm.
4. circuit board as claimed in claim 3, wherein this winding displacement layer includes:
One basement membrane, it includes a upper surface; And
Therefore at least one conductor structure is arranged on this basement membrane, and this conductor structure protrudes from this upper surface, and forms this second airway to a side that is less than this conductor structure.
5. circuit board as claimed in claim 4, wherein this conductor structure includes a conductor and is used for transmitting this push button signalling.
6. circuit board as claimed in claim 5, wherein this conductor structure includes the outside that an insulating barrier is located at this conductor in addition.
7. circuit board as claimed in claim 3, wherein the following circuit layer of the winding displacement layer of this bus-bar construction and this film switch circuit is formed in one.
8. circuit board as claimed in claim 7, wherein the diaphragm of this bus-bar construction stretches between the upper and lower circuit layer of this film switch circuit.
9. circuit board as claimed in claim 1, wherein should go up circuit layer and include a plurality of upper contacts, this time circuit layer includes a plurality of corresponding contacts down, therefore and form one up and down between contact and preset the space in each group is corresponding, this film switch circuit includes a plurality of first airways in addition and is used for making these a plurality of spaces of presetting to communicate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB001203827A CN1153234C (en) | 2000-07-17 | 2000-07-17 | Thin-film circuit board for keyboard |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB001203827A CN1153234C (en) | 2000-07-17 | 2000-07-17 | Thin-film circuit board for keyboard |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1334578A CN1334578A (en) | 2002-02-06 |
| CN1153234C true CN1153234C (en) | 2004-06-09 |
Family
ID=4588181
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB001203827A Expired - Fee Related CN1153234C (en) | 2000-07-17 | 2000-07-17 | Thin-film circuit board for keyboard |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1153234C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112802701B (en) * | 2021-01-29 | 2024-05-17 | 深圳市璞瑞达薄膜开关技术有限公司 | Frame type keyboard circuit film with tortuous air passage and manufacturing method thereof |
-
2000
- 2000-07-17 CN CNB001203827A patent/CN1153234C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1334578A (en) | 2002-02-06 |
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| Date | Code | Title | Description |
|---|---|---|---|
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20040609 Termination date: 20190717 |