CN203708549U - Eyesight protection detection device for children - Google Patents
Eyesight protection detection device for children Download PDFInfo
- Publication number
- CN203708549U CN203708549U CN201320818011.1U CN201320818011U CN203708549U CN 203708549 U CN203708549 U CN 203708549U CN 201320818011 U CN201320818011 U CN 201320818011U CN 203708549 U CN203708549 U CN 203708549U
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- triode
- circuit
- light
- emitting diode
- resistor
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- Expired - Fee Related
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Abstract
The utility model discloses an eyesight protection detection device for children, and the device comprises a power circuit, a detection circuit, and a display circuit, wherein the power circuit, the detection circuit and the display circuit are connected sequentially. The power circuit consists of a resistor R1, a light-emitting diode VL1, a switch S, and a power supply GB. The detection circuit consists of a photoresistor RG, a variable resistor RP, a resistor R2, and a triode VT1, wherein the photoresistor RG, the variable resistor RP, the resistor R2 and the triode VT1 are in parallel connection with each other. The display circuit comprises a triode VT2, a light-emitting diode VL2, a resistor R3, a triode VT3, a light-emitting diode VL3, and a resistor R4, wherein the triode VT2, the light-emitting diode VL2 and the resistor R3 are in series connection, and the triode VT3, the light-emitting diode VL3 and the resistor R4 are in series connection with each other and are in parallel connection with the above series circuit. The device provided by the utility model is simple in structure, is reasonable in design, is convenient to use, and can prevent the nearsightedness of the children, thereby preventing the eyesight.
Description
Technical field
The utility model relates to a kind of checkout gear, is specifically related to a kind of children ' s vision protection checkout gear.
Background technology
Along with the transition in epoch, the probability of children myopia is increasing, under the darker environment of light, sees that written word has been the common mode of children, and this mode very easily causes the decline of eyesight, thereby has aggravated bathomorphic situation.
Utility model content
Utility model object: the purpose of this utility model is in order to solve deficiency of the prior art, provides a kind of children ' s vision simple in structure, easy to use protection checkout gear.
Technical scheme: a kind of children ' s vision protection checkout gear described in the utility model; comprise the power circuit, testing circuit and the display circuit that are linked in sequence; described power circuit is made up of resistance R 1, light-emitting diode VL1, switch S and power supply GB; described testing circuit is by photo resistance RG parallel with one another, variable resistor RP and resistance R 2, triode VT1, described display circuit comprise series connection triode VT2, light-emitting diode VL2 and, R3 and in parallel with above-mentioned series circuit and triode VT3, light-emitting diode VL3 and the resistance R 4 through being connected in series mutually.
Beneficial effect: the utility model is simple in structure, reasonable in design, easy to use, can prevent the generation of children myopia, thereby protect eyesight.
Brief description of the drawings
Fig. 1 is circuit theory diagrams of the present utility model.
Embodiment
A kind of children ' s vision protection checkout gear as shown in Figure 1; comprise the power circuit, testing circuit and the display circuit that are linked in sequence; power circuit is made up of resistance R 1, light-emitting diode VL1, switch S and power supply GB; testing circuit is by photo resistance RG parallel with one another, variable resistor RP and resistance R 2, triode VT1, display circuit comprise series connection triode VT2, light-emitting diode VL2 and, R3 and in parallel with above-mentioned series circuit and triode VT3, light-emitting diode VL3 and the resistance R 4 through being connected in series mutually.
The switch S that switches on power, VL1 electricity, lights.In the time that ambient lighting intensity is applicable to read-write, the resistance of variable resistor RG is less, triode VT1 conducting, and triode VT2 cut-off, light-emitting diode VL2 is not luminous, triode VT3 conducting, light-emitting diode VL3 lights; When ambient light is dark, while requiring lower than read-write, the resistance of variable resistor RG makes triode VT1 cut-off, triode VT2 conducting, and light-emitting diode VL2 lights, triode VT3 cut-off simultaneously, light-emitting diode VL3 extinguishes.The resistance that regulates variable resistor RP, can change light-operated sensitivity.
Claims (1)
1. a children ' s vision protection checkout gear; it is characterized in that: comprise the power circuit, testing circuit and the display circuit that are linked in sequence; described power circuit is made up of resistance R 1, light-emitting diode VL1, switch S and power supply GB; described testing circuit is by photo resistance RG parallel with one another, variable resistor RP and resistance R 2, triode VT1, described display circuit comprise series connection triode VT2, light-emitting diode VL2 and, R3 and in parallel with above-mentioned series circuit and triode VT3, light-emitting diode VL3 and the resistance R 4 through being connected in series mutually.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320818011.1U CN203708549U (en) | 2013-12-13 | 2013-12-13 | Eyesight protection detection device for children |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320818011.1U CN203708549U (en) | 2013-12-13 | 2013-12-13 | Eyesight protection detection device for children |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203708549U true CN203708549U (en) | 2014-07-09 |
Family
ID=51058924
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320818011.1U Expired - Fee Related CN203708549U (en) | 2013-12-13 | 2013-12-13 | Eyesight protection detection device for children |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203708549U (en) |
-
2013
- 2013-12-13 CN CN201320818011.1U patent/CN203708549U/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: 20140709 Termination date: 20141213 |
|
| EXPY | Termination of patent right or utility model |