CN204477966U - Light pen led circuit - Google Patents
Light pen led circuit Download PDFInfo
- Publication number
- CN204477966U CN204477966U CN201520026682.3U CN201520026682U CN204477966U CN 204477966 U CN204477966 U CN 204477966U CN 201520026682 U CN201520026682 U CN 201520026682U CN 204477966 U CN204477966 U CN 204477966U
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- resistance
- triode
- circuit
- light pen
- power supply
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Abstract
The utility model relates to a kind of light pen LED circuit, comprises power supply, light pulse Acquisition Circuit and on-off circuit; Described light pulse Acquisition Circuit comprises adjustable resistance, photo resistance, divider resistance and filter capacitor, described power supply, adjustable resistance, photo resistance and divider resistance are connected in series rear ground connection successively, and described filter capacitor is connected in parallel on the series circuit two ends of adjustable resistance and photo resistance; Described on-off circuit comprises the first on-off circuit, second switch circuit and the 3rd on-off circuit.This light pen LED circuit utilizes the sensitivity of photo resistance, substitute traditional photodiode, not only achieve the detection of optical signal, the response speed that light pen gathers optical signal can also be improved, utilize adjustable resistance, not only increase the induction range of light pen to light, increase application scenario, also improve the adjustability of light pen.
Description
Technical field
The utility model relates to a kind of light pen LED circuit.
Background technology
Traditional light pen LED circuit adopts the mode of photodiode, and light pulse signal is converted to level signal.Corresponding photodiode Property comparison is fixed, and the induction range for light is more fixing, and response speed is also inconsistent, so traditional light pen LED circuit has certain limitation for application scenario.
Utility model content
The technical problems to be solved in the utility model is: slow in order to overcome prior art response speed, the deficiency that induction range is narrow, provides a kind of light pen LED circuit.
The utility model solves the technical scheme that its technical problem adopts: a kind of light pen LED circuit, comprises power supply, light pulse Acquisition Circuit and on-off circuit;
Described light pulse Acquisition Circuit comprises adjustable resistance, photo resistance, divider resistance and filter capacitor, described power supply, adjustable resistance, photo resistance and divider resistance are connected in series rear ground connection successively, and described filter capacitor is connected in parallel on the series circuit two ends of adjustable resistance and photo resistance;
Described on-off circuit comprises the first on-off circuit, second switch circuit and the 3rd on-off circuit;
Described first on-off circuit comprises the first triode, the first resistance and the second resistance, the base stage of described first triode is connected between photo resistance and divider resistance by the first resistance, the colelctor electrode of the first triode is connected with power supply by the second resistance, the grounded emitter of the first triode;
Described second switch circuit comprises the second triode, the 3rd resistance and the 4th resistance, the base stage of described second triode is connected between the second resistance and the first triode by the 3rd resistance, the colelctor electrode of the second triode is by the 4th resistance eutral grounding, and the emitter stage of the second triode is connected with power supply;
Described 3rd on-off circuit comprises the 3rd triode, the 5th resistance, the 6th resistance and diode, the base stage of described 3rd triode is connected between the second resistance and the first triode by the 5th resistance, the colelctor electrode of the 3rd triode is connected with power supply by the series circuit of diode with the 6th resistance, the grounded emitter of the 3rd triode.
Particularly, described first triode is NPN type triode, and described second triode is PNP type triode, and described 3rd triode is NPN triode.
Particularly, described supply voltage is 5V.
The beneficial effects of the utility model are, this light pen LED circuit utilizes the sensitivity of photo resistance, substitute traditional photodiode, not only achieve the detection of optical signal, the response speed that light pen gathers optical signal can also be improved, utilize adjustable resistance, not only increase the induction range of light pen to light, increase application scenario, also improve the adjustability of light pen.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the utility model is further illustrated.
Fig. 1 is the circuit theory diagrams of the utility model light pen LED circuit;
In figure: P1. adjustable resistance, LDR. photo resistance, R1. divider resistance, R2. the first resistance, R3. second resistance, R4. the 3rd resistance, R7. the 4th resistance, R5. the 5th resistance, R6. the 6th resistance, Q1. first triode, Q2. the second triode, Q3. the 3rd triode, C26. filter capacitor, D1. diode.
Detailed description of the invention
By reference to the accompanying drawings the utility model is described in further detail now.These accompanying drawings are the schematic diagram of simplification, only basic structure of the present utility model are described in a schematic way, and therefore it only shows the formation relevant with the utility model.
As shown in Figure 1, a kind of light pen LED circuit, comprises power supply, light pulse Acquisition Circuit and on-off circuit;
Described light pulse Acquisition Circuit comprises adjustable resistance P1, photo resistance LDR, divider resistance R1 and filter capacitor C26, described power supply, adjustable resistance P1, photo resistance LDR and divider resistance R1 are connected in series rear ground connection successively, and described filter capacitor C26 is connected in parallel on the series circuit two ends of adjustable resistance P1 and photo resistance LDR;
Described on-off circuit comprises the first on-off circuit, second switch circuit and the 3rd on-off circuit;
Described first on-off circuit comprises the first triode Q1, the first resistance R2 and the second resistance R3, the base stage of described first triode Q1 is connected between photo resistance LDR and divider resistance R1 by the first resistance R2, the colelctor electrode of the first triode Q1 is connected with power supply by the second resistance R3, the grounded emitter of the first triode Q1;
Described second switch circuit comprises the second triode Q2, the 3rd resistance R4 and the 4th resistance R7, the base stage of described second triode Q2 is connected between the second resistance R3 and the first triode Q1 by the 3rd resistance R4, the colelctor electrode of the second triode Q2 is by the 4th resistance R7 ground connection, and the emitter stage of the second triode Q2 is connected with power supply;
Described 3rd on-off circuit comprises the three or three pole Q3 pipe, the 5th resistance R5, the 6th resistance R6 and diode D1, the base stage of described 3rd triode Q3 is connected between the second resistance R3 and the first triode Q1 by the 5th resistance R5, the colelctor electrode of the 3rd triode Q3 is connected with power supply with the series circuit of the 6th resistance R6 by diode D1, the grounded emitter of the 3rd triode Q3.
Particularly, described first triode Q1 is NPN type triode, and described second triode Q2 is PNP type triode, and described 3rd triode Q3 is NPN triode.
Particularly, described supply voltage is 5V.
Adjustable resistance P1 in light pulse Acquisition Circuit, by changing its resistance, improves the light signal collection scope of light pulse Acquisition Circuit, is used for regulating the sensitivity of light pen.
When photo resistance LDR in light pulse Acquisition Circuit senses optical signal, the resistance value of photo resistance LDR sharply reduces, and response speed is exceedingly fast.
When the photo resistance LDR of light pulse Acquisition Circuit collects light pulse signal, a point just produces high level and makes the first triode Q1 conducting, thus the common-collector circuit conducting be made up of the first triode Q1, after the common-collector circuit conducting be made up of the first triode Q1, b point and c point just produce low level, then the common emitter circuit be made up of the second triode Q2 and the common-base circuit be made up of the 3rd triode Q3 all turn off, the common emitter circuit d point output low level signal be made up of the second triode Q2, diode D1 in the common-base circuit be made up of the 3rd triode Q3 turns off, being used for display collects light pulse signal.
When the photo resistance LDR of light pulse Acquisition Circuit does not collect light pulse signal, a point just produces low level, thus the common-collector circuit be made up of the first triode Q1 is turned off, b point and c point just produce high level, trigger the 3rd triode Q3 and the second triode Q2 respectively and make conducting both it, then the common emitter circuit be made up of the second triode Q2 and the common-base circuit all conductings be made up of the 3rd triode Q3, the common emitter circuit d point be made up of the second triode Q2 exports high level signal, diode D1 conducting in the common-base circuit be made up of the 3rd triode Q3, be used for showing and do not collect light pulse signal.
Compared with prior art, this light pen LED circuit utilizes the sensitivity of photo resistance LDR, substitute traditional photodiode, not only achieve the detection of optical signal, the response speed that light pen gathers optical signal can also be improved, utilize adjustable resistance P1, not only increase the induction range of light pen to light, increase application scenario, also improve the adjustability of light pen.
With above-mentioned according to desirable embodiment of the present utility model for enlightenment, by above-mentioned description, relevant staff in the scope not departing from this utility model technological thought, can carry out various change and amendment completely.The technical scope of this utility model is not limited to the content on description, must determine its technical scope according to right.
Claims (3)
1. a light pen LED circuit, is characterized in that, comprises power supply, light pulse Acquisition Circuit and on-off circuit;
Described light pulse Acquisition Circuit comprises adjustable resistance, photo resistance, divider resistance and filter capacitor, described power supply, adjustable resistance, photo resistance and divider resistance are connected in series rear ground connection successively, and described filter capacitor is connected in parallel on the series circuit two ends of adjustable resistance and photo resistance;
Described on-off circuit comprises the first on-off circuit, second switch circuit and the 3rd on-off circuit;
Described first on-off circuit comprises the first triode, the first resistance and the second resistance, the base stage of described first triode is connected between photo resistance and divider resistance by the first resistance, the colelctor electrode of the first triode is connected with power supply by the second resistance, the grounded emitter of the first triode;
Described second switch circuit comprises the second triode, the 3rd resistance and the 4th resistance, the base stage of described second triode is connected between the second resistance and the first triode by the 3rd resistance, the colelctor electrode of the second triode is by the 4th resistance eutral grounding, and the emitter stage of the second triode is connected with power supply;
Described 3rd on-off circuit comprises the 3rd triode, the 5th resistance, the 6th resistance and diode, the base stage of described 3rd triode is connected between the second resistance and the first triode by the 5th resistance, the colelctor electrode of the 3rd triode is connected with power supply by the series circuit of diode with the 6th resistance, the grounded emitter of the 3rd triode.
2. light pen LED circuit as claimed in claim 1, it is characterized in that, described first triode is NPN type triode, and described second triode is PNP type triode, and described 3rd triode is NPN triode.
3. light pen LED circuit as claimed in claim 1, it is characterized in that, described supply voltage is 5V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520026682.3U CN204477966U (en) | 2015-01-15 | 2015-01-15 | Light pen led circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520026682.3U CN204477966U (en) | 2015-01-15 | 2015-01-15 | Light pen led circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204477966U true CN204477966U (en) | 2015-07-15 |
Family
ID=53633755
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520026682.3U Expired - Fee Related CN204477966U (en) | 2015-01-15 | 2015-01-15 | Light pen led circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204477966U (en) |
-
2015
- 2015-01-15 CN CN201520026682.3U patent/CN204477966U/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 |
Granted publication date: 20150715 Termination date: 20160115 |
|
| EXPY | Termination of patent right or utility model |