CN205581793U - Novel snap dome keyboard circuit - Google Patents
Novel snap dome keyboard circuit Download PDFInfo
- Publication number
- CN205581793U CN205581793U CN201620242749.1U CN201620242749U CN205581793U CN 205581793 U CN205581793 U CN 205581793U CN 201620242749 U CN201620242749 U CN 201620242749U CN 205581793 U CN205581793 U CN 205581793U
- Authority
- CN
- China
- Prior art keywords
- metal dome
- trigger
- keyboard circuit
- encoder
- utility
- Prior art date
- 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.)
- Expired - Fee Related
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Abstract
The utility model discloses a novel snap dome keyboard circuit, it contains keyboard circuit body and snap dome button, and circuit body includes controller, encoder and output buffer, and the output buffer is connected respectively to controller and encoder, and snap dome presses the key -type connection encoder, and snap dome button shape is pot describes, the utility model relates to a rationally, convenient to use, convenient to use need not weld, uses the number of times unrestricted basically, does not receive the environmental impact, and easy and simple to handle, work efficiency is high, saves time long service life.
Description
Technical field
This utility model relates to keyboard circuit field, is specifically related to a kind of novel metal dome keyboard circuit.
Background technology
Our use usually needs design keyboard, being used for, parameter is set and other operates.In the presence of in product, mainly realizing with mechanical key or touch keyboard, mechanical key, owing to being affected by high temperature when circuit board paster, is easily damaged, and touch potential is the most restricted simultaneously, the most aging, needs often to reprocess.Touch keyboard easily identifies mistake greatly due to affected by environment, and using effect is less desirable.
Utility model content
The purpose of this utility model is the defect for prior art and deficiency, it is provided that a kind of novel metal dome keyboard circuit.
In order to solve the problem existing for background technology, a kind of novel metal dome keyboard circuit of the present utility model, it comprises keyboard circuit body and metal dome button, circuit body includes controller, encoder and output buffer, controller and encoder connect output buffer respectively, metal dome presses bonded encoder, and metal dome key shape is pot son's shape.
As preferably, described metal dome button includes button, power supply and resistance, and by bonded resistance, resistance connects power supply.
As preferably, described controller include the first trigger, the second trigger and with door, the first trigger connects the second trigger, the first trigger and the second trigger and connects respectively and door.
This utility model has the beneficial effect that this utility model is reasonable in design, easy to use, easy to use, need not weld, and access times are substantially unrestricted, the most affected by environment, easy and simple to handle, and work efficiency is high, and time-consuming, service life is long.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model；
Fig. 2 is schematic diagram of the present utility model；
Fig. 3 is keyboard circuit structure chart of the present utility model；
Fig. 4 is controller circuitry figure of the present utility model.
Description of reference numerals:
1-keyboard circuit body；2-metal dome button；3-controller；4-encoder.
Detailed description of the invention
Below in conjunction with the accompanying drawings, this utility model is further described.
In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with the drawings and the specific embodiments, this utility model is further elaborated.Should be appreciated that detailed description of the invention described herein, only in order to explain this utility model, is not used to limit this utility model.
As shown in Figure 1, this detailed description of the invention adopts the following technical scheme that it comprises keyboard circuit body 1 and metal dome button 2, circuit body includes controller 3, encoder 4 and output buffer, controller 3 and encoder 4 connect output buffer respectively, metal dome button 2 connects encoder 4, and metal dome key shape is pot son's shape.
Further, described metal dome button includes button, power supply and resistance, and by bonded resistance, resistance connects power supply.
Further, described controller include the first trigger, the second trigger and with door, the first trigger connects the second trigger, the first trigger and the second trigger and connects respectively and door.
The operation principle of this detailed description of the invention is: produce " L " level signal of this key when there being key to be pressed, and key assignments is converted to the key of correspondence by priority encoder.5 inputs or door output signal bt indicate that key is pressed.All output signals of circuit are subjected to the control of output signal oe of " controller ".After push button signalling is stable, oe signal opens tristate output buffer output
Key also makes data selector export bt signal.
The principle of " controller ": be made up of with door 2 grades of d type flip flops and 1, CLR end is the asynchronous reset end of d type flip flop.As bt=0, oe=0；As bt=1 and keep constant, after the cycle (2 rising edges of key_clk) approximately passing through key_clk, oe=1, i.e. delay time are approximately equal to a cycle of key_clk.Therefore, after button is pressed and stablized, when the time that state keeps is more than a cycle of key_clk, key_cord and key_down signal is just had to export.As long as ensureing the cycle width more than manipulation noise signal of key_clk, so that it may ensure the cue output that stable key and key are pressed.
The above, only in order to the technical solution of the utility model to be described and unrestricted, other amendment or equivalent that the technical solution of the utility model is made by those of ordinary skill in the art, without departing from the spirit and scope of technical solutions of the utility model, all should contain in the middle of right of the present utility model.
Claims (3)
1. a novel metal dome keyboard circuit, it is characterized in that: it comprises keyboard circuit body and metal dome button, circuit body includes controller, encoder and output buffer, controller and encoder connect output buffer respectively, metal dome presses bonded encoder, and metal dome key shape is pot son's shape.
A kind of novel metal dome keyboard circuit the most according to claim 1, it is characterised in that: described metal dome button includes button, power supply and resistance, and by bonded resistance, resistance connects power supply.
A kind of novel metal dome keyboard circuit the most according to claim 1, it is characterized in that: described controller include the first trigger, the second trigger and with door, first trigger connects the second trigger, the first trigger and the second trigger and connects respectively and door.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620242749.1U CN205581793U (en) | 2016-03-28 | 2016-03-28 | Novel snap dome keyboard circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620242749.1U CN205581793U (en) | 2016-03-28 | 2016-03-28 | Novel snap dome keyboard circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205581793U true CN205581793U (en) | 2016-09-14 |
Family
ID=56866964
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620242749.1U Expired - Fee Related CN205581793U (en) | 2016-03-28 | 2016-03-28 | Novel snap dome keyboard circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205581793U (en) |
-
2016
- 2016-03-28 CN CN201620242749.1U patent/CN205581793U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 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: 20160914 Termination date: 20190328 |