CN2039194U - Eyesight-protecting device - Google Patents
Eyesight-protecting device Download PDFInfo
- Publication number
- CN2039194U CN2039194U CN 88214569 CN88214569U CN2039194U CN 2039194 U CN2039194 U CN 2039194U CN 88214569 CN88214569 CN 88214569 CN 88214569 U CN88214569 U CN 88214569U CN 2039194 U CN2039194 U CN 2039194U
- Authority
- CN
- China
- Prior art keywords
- eyesight
- illumination
- protecting device
- order
- adopt
- 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.)
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Abstract
The utility model relates to an eyesight-protecting device which uses an electronic circuit to control LEDs with three different colors. The LEDs are switched on or switched off under the condition of different illumination in order to designate illuminated range, so the eyesight-protecting device can correctly advise children to read and write under proper illumination conditions, in order to reduce the rate of myopia. The eyesight-protecting device has the advantages of simple circuit, low requirement on components, small size, large regulating range of the illumination intensity indication, etc. The eyesight-protecting device can be installed independently and can also be arranged in stationery cases, desk lamp bases, pen holders, rulers and other relevant objects in order to test the illumination intensity of reading and writing occasions at any time.
Description
This utility model belongs to health product
Protection children's vision reduces the myopia incidence rate, is the problem that various circles of society generally are concerned about.In the factor that myopia takes place, unsuitable daylighting is a main aspect.
The purpose of this utility model is exactly a kind of light emitting diode with three kinds of different colours of electronic circuit control of design; make it with conducting under the condition of different light or end; show the scope of illumination with this, thus the vision protector that instructs children under suitable illumination condition, to read and write.
Feature of the present utility model is: 1, adopt photoconductive resistance to receive the illumination signal; 2, adopt connecting that tertiary current amplifies and form with diode by one at three inter-stages, control the conducting of three light emitting diodes respectively or end with door; 3, before amplifying, adopts in the third level electric current emitter follower; 4, seal in a critesistor at circuit input end; 5, adopt potentiometer W
2And W
2Regulate the illumination range of required indication.
Accompanying drawing 1 is a block diagram of the present utility model.
Accompanying drawing 2 is electrical schematic diagrams of the present utility model.
Further specify this utility model below in conjunction with accompanying drawing.
This utility model is thought when illumination is less than 200LUX for dark, when illumination is 200LUX～8000LUX for suitable, illumination during greater than 8000LUX for too strong (consult that gansu science and technology publishing house publishes by the flourish chief editor of drizzle " ophthalmology medical care handbook and People's Health Publisher publish by the Wang Shoujing chief editor " clinical ophthalmology handbook), and represent with work yellow, green and three kinds of color LEDs of redness respectively.
Pressing the K switch circuit starts working.
When illumination is lower than 200LUX, photoconductive resistance R
1Present bigger resistance value, by BG
1, BG
2Paraphase and the electric current amplifier stage formed present Low ESR, BG
2Current collection is electronegative potential very, and yellow light-emitting diode work is luminous, has represented that at this moment illumination is too dark.Simultaneously because D
4, D
5And resistance R
5Effect, a point with door formed also are in electronegative potential makes D
5And BG
3The electric current amplifier stage of forming presents high impedance, green LED D
2Not luminous.
Illumination strengthens, when reaching 200LUX～8000LUX, and photoconductive resistance R
1Resistance value reduce regulator potentiometer W
1, can make BG
1Conducting and BG
2End yellow light-emitting diode D
1Extinguish, simultaneously, because BG
2At this moment colelctor electrode becomes high potential, and if BG
5Also in cut-off state, a point current potential is a high potential from former electronegative potential transition just so, impels BG
3Conducting, and make green LED luminous, expression illumination is suitable, by D
5And BG
3In the electric current amplifier stage of forming, diode D
5Effect be to make BG in order to improve
2The threshold voltage of conducting, because because the influence of the forward voltage drop of the full pressure drop of audion and diode, the current potential when a point is in electronegative potential also can be so that BG
3Conducting, and cause the simultaneously luminous mistake indication phenomenon of two luminous tubes.At BG
3Base stage seals in after forward voltage drop reaches the above silicon diode of 0.6V, has just avoided the phenomenon of mistake indication.
When illumination is very strong, during promptly greater than 8000LUX, photoconductive resistance R
1Resistance very little, make emitter follower BG
4Base potential near supply voltage, regulate W
2, can make BG
5Be in saturation, red light emitting diodes D
3Luminous, while BG
5Colelctor electrode becomes electronegative potential from former high potential, by diode D
6Effect, a point is forced to fall from high potential and is electronegative potential BG
3End green LED D from the conducting change
2Extinguish.At this moment have only red light emitting diodes luminous, represented illumination too strong.Emitter follower BG
4Effect except amplifying as weak current to promote BG
5Outside the base stage, also because its high input impedance and buffer action are being regulated W
2Shi Buhui has influence on by R
1, W
1, R
2The size of the branch current of forming, thus the degree of regulation of other two luminances do not influenced.
Critesistor R at a negative temperature coefficient of circuit input end serial connection
2, be in order to compensate because photoconductive resistance, the positive temperature characterisitic that audion causes is provided with.
This vision protector current/voltage is direct current 3V
+ 0.2 -0.4
In order to adapt to the requirement of different light working environment, this utility model also is provided with two potentiometer W
1And W
2Regulate the conducting valve of green LED and the conducting valve of red light emitting diodes respectively.Thereby regulated the indicated illumination range of green luminotron.
The vision protector of making according to the utility model; have that circuit is simple, the components and parts requirement is low, volume is little, the big and simple and practical advantage of illumination indication adjustable range; can be separately by dress; also can be contained in the writing case, in the lamp stand, in the shaft of a writing brush, in the ruler and in other object; except the illumination of read-write occasion being tested and instruct, can also be used for other and need to determine the occasion of illumination range.
Claims (1)
1, vision protector is characterized in that:
(1) adopt photoconductive resistance to receive the illumination signal;
(2) adopt tertiary current to amplify, and forms with diode by one between three grades connect the conducting of controlling the light emitting diode that is connected in series on the transistor collectors at different levels respectively with door and end;
(3) before third level electric current amplifies, adopt the one-level emitter following;
(4) be connected in series a critesistor at circuit input end;
(5) use potentiometer W
1And W
2Regulate the illumination model figure of required indication.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88214569 CN2039194U (en) | 1988-09-30 | 1988-09-30 | Eyesight-protecting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88214569 CN2039194U (en) | 1988-09-30 | 1988-09-30 | Eyesight-protecting device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2039194U true CN2039194U (en) | 1989-06-14 |
Family
ID=4847495
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 88214569 Withdrawn CN2039194U (en) | 1988-09-30 | 1988-09-30 | Eyesight-protecting device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2039194U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102394631A (en) * | 2011-10-08 | 2012-03-28 | 黄宇嵩 | Light-sensing control switch |
-
1988
- 1988-09-30 CN CN 88214569 patent/CN2039194U/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102394631A (en) * | 2011-10-08 | 2012-03-28 | 黄宇嵩 | Light-sensing control switch |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |