CN203278792U - Structure capable of realizing switching function of mechanical key by means of capacitive touch detection chip - Google Patents
Structure capable of realizing switching function of mechanical key by means of capacitive touch detection chip Download PDFInfo
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- CN203278792U CN203278792U CN 201320318497 CN201320318497U CN203278792U CN 203278792 U CN203278792 U CN 203278792U CN 201320318497 CN201320318497 CN 201320318497 CN 201320318497 U CN201320318497 U CN 201320318497U CN 203278792 U CN203278792 U CN 203278792U
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- mechanical key
- touch detection
- detection chip
- capacitance touch
- switching function
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Abstract
The utility model discloses a structure capable of realizing the switching function of a mechanical key by means of a capacitive touch detection chip, which comprises a capacitive touch detection chip and a mechanical key electrically connected with the capacitive touch detection chip. Besides, the structure also comprises a capacitor arranged between the capacitive touch detection chip and the mechanical key. Based on the fact that the variation of the capacitor can be detected by means of the capacitive touch detection chip, whether a finger touches the mechanical key or not can be judged.
Description
Technical field
The utility model relates to a kind of button, relates in particular to a kind of structure that realizes the mechanical key switching function by the capacitance touch detection chip.
Background technology
General technology is at present: 1, as shown in Figure 1, use the mechanical key on-off mode: with mobile phone as example, what regular handset and smart mobile phone CPU supported is matrix keyboard, every alignment and line directly are not communicated with at infall, but are connected with Key2 by a light-touch switch key-press Key1.Alignment connects positive supply by resistance, and line meets CPU I/O as output, and the CPU I/O that alignment connects is as input.Like this, when light-touch switch key-press does not have button lower time, input is high level, and representative is pressed without light-touch switch key-press.Line output is low level, in case there is light-touch switch key-press to press, input line will be dragged down, and just can determine that by the state that reads in input line that light-touch switch key-press supresses like this, realizes keypress function.2, use the capacitance touch detection chip, point by human body the electric charge that brings and move, and judge the human finger touch action, thereby realize keypress function.A defective can appear in these two kinds of methods, no matter be to use the mechanical key on-off mode, still uses the capacitance touch detection chip.Two kinds of key-press input modes can not be compatible, otherwise can only use the mechanical key switch, otherwise can only use the touch sensible electrode input that is exclusively used in the capacitance touch detection chip, and both can not use simultaneously.Because both are different operation principles, do not realize the principle basis of both compatible designs.In this case, want design increase mechanical key switch and capacitance-type switch compatibility function on product, just need the input system of the whole product of redesign, relevant control system, software and hardware all will be done significantly change, and the design cycle at least will be more than six months, and systematic comparison is complicated, to adjust on a large scale input management system, time and effort consuming.
Therefore, need a kind of structure that realizes the mechanical key switching function by the capacitance touch detection chip badly.
The utility model content
The purpose of this utility model is to provide a kind of structure that realizes the mechanical key switching function by the capacitance touch detection chip.
To achieve these goals, the technical scheme that the utility model provides is: a kind of structure that realizes the mechanical key switching function by the capacitance touch detection chip is provided, comprise: capacitance touch detection chip and the mechanical key that is electrically connected with described capacitance touch detection chip, describedly realize that by the capacitance touch detection chip structure of mechanical key switching function also includes the electric capacity that is electrically connected between described capacitance touch detection chip and mechanical key.
The capacity of described electric capacity is 2.2 pico farads.
Described capacitance touch detection chip is installed on pcb board, and described mechanical key is carried on described pcb board.
Described mechanical key comprises key panel and ground, is arranged between key panel and pcb board describedly.
Be provided with induction electrode on described key panel.
Compared with prior art, realize in the structure of mechanical key switching function by the capacitance touch detection chip due to the utility model, owing to being provided with described electric capacity, when there is no the described mechanical key of finger close, the electric capacity on described mechanical key is comprised of the parasitic capacitance between described mechanical key and ground.When the described mechanical key of finger touch is arranged, because human body has conductivity, therefore make electric field enhancing, electric capacity in parallel with this parasitic capacitance of formation of described mechanical key top, thereby cause the total capacitance on described mechanical key to increase, and described capacitance touch detection chip is by detecting the variation of this electric capacity, thereby judged whether finger touch.
By following description also by reference to the accompanying drawings, it is more clear that the utility model will become, and these accompanying drawings are used for explaining embodiment of the present utility model.
Description of drawings
Fig. 1 is the circuit principle structure diagram of the mechanical key of prior art.
Fig. 2 is that the utility model is realized the structural circuit theory structure diagram of mechanical key switching function by the capacitance touch detection chip.
Fig. 3 is the electric field schematic diagram of mechanical key before finger touch.
Fig. 4 is the electric field schematic diagram of mechanical key when finger touch.
Embodiment
With reference now to accompanying drawing, describe embodiment of the present utility model, in accompanying drawing, similar element numbers represents similar element.As mentioned above, as shown in Fig. 2,3 and 4, the utility model provides passes through the structure 100 that the capacitance touch detection chip realizes the mechanical key switching function, comprise: capacitance touch detection chip 10 and the mechanical key 20 that is electrically connected with described capacitance touch detection chip 10, describedly realize that by the capacitance touch detection chip structure 100 of mechanical key switching function also includes the electric capacity 30 that is electrically connected between described capacitance touch detection chip 10 and mechanical key 20.
The capacity of described electric capacity 30 is 2.2 pico farads.
Described capacitance touch detection chip 10 is installed on pcb board 40, and described mechanical key 20 is carried on described pcb board 40.
Described mechanical key 20 comprises key panel 21 and ground 22, and described ground 22 is arranged between key panel 21 and pcb board 40.
Be provided with induction electrode (not showing on figure) on described key panel 21.
In conjunction with Fig. 2,3 and 4, realize in the structure 100 of mechanical key switching function by the capacitance touch detection chip due to the utility model, owing to being provided with described electric capacity 30, when there is no the described mechanical key 20 of finger close, the electric capacity on described mechanical key 20 is comprised of the parasitic capacitance between described mechanical key 20 and ground.When the described mechanical key 20 of finger touch is arranged, because human body has conductivity, therefore make electric field enhancing, electric capacity in parallel with this parasitic capacitance of formation of described mechanical key 20 tops, thereby cause the total capacitance on described mechanical key 20 to increase, and described capacitance touch detection chip 10 is by detecting the variation of this electric capacity, thereby judged whether finger touch.
Above disclosed is only preferred embodiment of the present utility model, certainly can not limit with this interest field of the utility model, and the equivalent variations of therefore doing according to the utility model claim still belongs to the scope that the utility model is contained.
Claims (5)
1. structure that realizes the mechanical key switching function by the capacitance touch detection chip, comprise: capacitance touch detection chip and the mechanical key that is electrically connected with described capacitance touch detection chip, it is characterized in that, describedly realize that by the capacitance touch detection chip structure of mechanical key switching function also includes the electric capacity that is electrically connected between described capacitance touch detection chip and mechanical key.
2. the structure that realizes the mechanical key switching function by the capacitance touch detection chip as claimed in claim 1, it is characterized in that: the capacity of described electric capacity is 2.2 pico farads.
3. the structure that realizes the mechanical key switching function by the capacitance touch detection chip as claimed in claim 1, it is characterized in that: described capacitance touch detection chip is installed on pcb board, and described mechanical key is carried on described pcb board.
4. the structure that realizes the mechanical key switching function by the capacitance touch detection chip as claimed in claim 1 is characterized in that: described mechanical key comprises key panel and ground, is arranged between key panel and pcb board describedly.
5. the structure that realizes the mechanical key switching function by the capacitance touch detection chip as claimed in claim 3, is characterized in that: be provided with induction electrode on described key panel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320318497 CN203278792U (en) | 2013-05-30 | 2013-05-30 | Structure capable of realizing switching function of mechanical key by means of capacitive touch detection chip |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320318497 CN203278792U (en) | 2013-05-30 | 2013-05-30 | Structure capable of realizing switching function of mechanical key by means of capacitive touch detection chip |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203278792U true CN203278792U (en) | 2013-11-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320318497 Expired - Fee Related CN203278792U (en) | 2013-05-30 | 2013-05-30 | Structure capable of realizing switching function of mechanical key by means of capacitive touch detection chip |
Country Status (1)
| Country | Link |
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| CN (1) | CN203278792U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103607187A (en) * | 2013-11-12 | 2014-02-26 | 青岛歌尔声学科技有限公司 | Method and apparatus for detecting whether capacitor touch button is triggered |
| WO2022105875A1 (en) * | 2020-11-20 | 2022-05-27 | 深圳市力驰创新科技有限公司 | Input device, input method and keyboard |
-
2013
- 2013-05-30 CN CN 201320318497 patent/CN203278792U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103607187A (en) * | 2013-11-12 | 2014-02-26 | 青岛歌尔声学科技有限公司 | Method and apparatus for detecting whether capacitor touch button is triggered |
| CN103607187B (en) * | 2013-11-12 | 2017-02-15 | 青岛歌尔声学科技有限公司 | Method and apparatus for detecting whether capacitor touch button is triggered |
| WO2022105875A1 (en) * | 2020-11-20 | 2022-05-27 | 深圳市力驰创新科技有限公司 | Input device, input method and keyboard |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C53 | Correction of patent of invention or patent application | ||
| CB03 | Change of inventor or designer information |
Inventor after: Zhang Junfeng Inventor before: Qi Ming |
|
| COR | Change of bibliographic data |
Free format text: CORRECT: INVENTOR; FROM: QI MING TO: ZHANG JUNFENG |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131106 Termination date: 20210530 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |