CN2537073Y - Visual distance warning device for preventing myopia - Google Patents
Visual distance warning device for preventing myopia Download PDFInfo
- Publication number
- CN2537073Y CN2537073Y CN 02222201 CN02222201U CN2537073Y CN 2537073 Y CN2537073 Y CN 2537073Y CN 02222201 CN02222201 CN 02222201 CN 02222201 U CN02222201 U CN 02222201U CN 2537073 Y CN2537073 Y CN 2537073Y
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- CN
- China
- Prior art keywords
- circuit
- infrared
- shaping
- constitute
- switch
- 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 provides a sight distance alarm device for preventing myopia, wherein, a circuit comprises an infrared emitting and receiving circuit, a shaping amplification and modulating time delay circuit, a sound alarm circuit, a light alarm circuit, and a power supply circuit, wherein, the output infrared emitting and receiving circuit is connected with the input of the shaping amplification and modulating time delay circuit; the output of the shaping amplification and modulating time delay circuit is connected with the input of the light alarm circuit and the sound alarm circuit; when in use, the device is arranged on a desk; when the sight distance is short, a signal is emitted by the infrared ray so as to sent out a light alarm or a sound alarm. The utility model has the advantages of simple and single structure, and convenient use.
Description
Technical field
The utility model relates to a kind of device that prevents eyesight myopia, particularly relates to a kind of near-sighted sighting distance caution instrument that prevents.
Background technology
At present, the incidence of disease height of myopia, especially teenager's incidence of disease is higher.Cause the reason of myopia varied, as objective factors such as the flicker of insufficient light, light, tables and chairs height are improper; But subjective factor is the major reason that causes myopia, and promptly reading or writing posture are incorrect.See the posture of written word for rectification, design all kinds of myopia prevention utensils.As posture corrective belt, anti-myopia gesture-correction frame and various Preventing short-sighted instrument.Chinese patent discloses a kind of myopia prevention language alarm set, it is made up of two sensitive elements, language sheet, loudspeaker, wiring board, minicell, shell parts, sensitive element and language sheet, loudspeaker, wiring board, minicell are fixed as one, and another sensitive element then is fixed on actor chest neck and collar place.Mainly be to realize sighting distance control by two sensitive elements.
Summary of the invention
It is a kind of simple in structure, easy to use that the purpose of this utility model is to provide, and directly places the near-sighted sighting distance caution instrument that prevents of desktop.
The utility model prevents that its circuit of near-sighted sighting distance caution instrument from being made up of infrared and receiving circuit, amplification shaping and MDL modulation delay circuit, sound alarm circuit, optical alarm circuit and power circuit.Infrared and receiving circuit output connect amplifies shaping and the input of MDL modulation delay circuit, amplifies the output of shaping and MDL modulation delay circuit and connects sound alarm circuit and optical alarm circuit input.Wherein, infrared and receiving circuit are by infrared ray inspection emission/reflection slowdown monitoring switch IC
1Constitute; Amplify shaping and MDL modulation delay circuit by not gate F
1, F
2And F
3, resistance R
1, R
2And R
3, capacitor C
1, C
2, C
3, C
4And C
7, diode D
1, potentiometer W
1Constitute; Sound alarm circuit is by musical film IC
2, loudspeaker Y, triode BG
2, resistance R
6And K switch
2Constitute; Optical alarm circuit is by triode BG
1, LED, resistance R
4And R
5, capacitor C
5And K switch
3Constitute; Power circuit is by transformer P, diode D
2Battery V and K switch
1Constitute.
The utility model circuit prevents that the principle of work of near-sighted sighting distance caution instrument from being Closing Switch K
1, infrared/reflection detector switch IC
1Send infrared ray, after the object blocks that runs into certain distance, then return, by infrared/reflection detector switch IC
1Receive, the electric signal of generation is through not gate F
1, F
2After anti-phase shaping is amplified, by potentiometer W
1To capacitor C
7Charging, the duration of charging can be passed through W
1Regulate, be generally 3 seconds (avoiding causing false alarm), work as C because of after accidental cause causes low coverage
7Both end voltage does not reach not gate F
3Level the time, capacitor C
7Both end voltage is through diode D
1Moment releases, and the caution instrument is not worked; After the sighting distance low coverage time surpasses 3 seconds, C
7Both end voltage surpasses F
3Level, F
3Output low level triggers musical film IC
2Or LED, to send corresponding acoustic alarm and/or light and report to the police, prompting user sighting distance is near excessively.Sighting distance generally is adjusted between 38~45mm, can pass through infrared/reflection detector switch IC
1Regulate.In use, also can pass through On/Off K
2, K
3, realize single light warning or acoustic alarm.
It is simple in structure that the utility model circuit prevents that the advantage of near-sighted sighting distance caution instrument is, is single structure, and need not be worn on the user and put on, not overslaugh user's action, highly sensitive, safe and reliable, easy to use.
Specific embodiments
Fig. 1: the utility model circuit block diagram
Fig. 2: the utility model circuit connection diagram
The utility model prevents that its circuit of near-sighted sighting distance caution instrument from being made up of infrared and receiving circuit, amplification shaping and MDL modulation delay circuit, sound alarm circuit, optical alarm circuit and power circuit.Infrared and receiving circuit output connect amplifies shaping and the input of MDL modulation delay circuit, amplifies the output of shaping and MDL modulation delay circuit and connects sound alarm circuit and optical alarm circuit input.Wherein, infrared and receiving circuit are by infrared/reflection detector switch IC
1(TX05D) constitute; Amplify shaping and MDL modulation delay circuit by not gate F
1, F
2And F
3, resistance R
1, R
2And R
3, capacitor C
1, C
2, C
3, C
4And C
7, diode D
1, potentiometer W
1Constitute.Its annexation is C
1One termination IC
1Output terminal 3 pin, C
1The other end and F
1, C
2, F
2, C
3, F
3And C
4Series connection, R
1, R
2With
3Two ends are connected to F respectively
1, F
2And F
3Input end and output terminal, D
1And W
1Back one termination F in parallel
3Input end, another termination F
3Output terminal and C
7One end, C
7Other end ground connection; Sound alarm circuit is by musical film IC
2(HY100), loudspeaker Y, triode BG
2, resistance R
6And K switch
2Constitute.Its annexation is IC
2Input end 1 pin meets C
4The other end, IC
2Output terminal 3 pin series connection C
6After meet BG
2Base stage, BG
2Grounded emitter, BG
2Collector meets K
2With Y one end; Optical alarm circuit is by triode BG
1, LED, resistance R
4And R
5, capacitor C
5And K switch
3Constitute.Its annexation is K
3One termination IC
2Output terminal and K
2The other end, K
3Another termination BG
1Emitter, BG
1Base stage meets R
4And C
5One end, R
4Another termination LED one end, another termination of LED R
5One end, R
5Another termination C
5The other end and BG
1Collector; Power circuit is by transformer P, diode D
2Battery V and K switch
1Constitute.Its annexation is that the initial termination civil power of P imports an end of holding and passes through K
1Meet IC
1Positive power source terminal 2 pin, IC
2Positive power source terminal 5 pin import the other end series connection R that holds
6After meet IC
2Negative power end 2 pin, the other end of Y, R
4With LED be connected mid point and IC
1Negative power end 1 pin.
Claims (2)
1, a kind of near-sighted sighting distance caution instrument that prevents, it is characterized in that circuit is made up of infrared and receiving circuit, amplification shaping and MDL modulation delay circuit, sound alarm circuit, optical alarm circuit and power circuit, infrared and receiving circuit output connect amplifies shaping and the input of MDL modulation delay circuit, amplifies the output of shaping and MDL modulation delay circuit and connects sound alarm circuit and optical alarm circuit input.
2, the near-sighted sighting distance caution instrument that prevents as claimed in claim 1 is characterized in that infrared and receiving circuit are by infrared/reflection detector switch IC
1Constitute; Amplify shaping and MDL modulation delay circuit by not gate F
1, F
2And F
3And peripheral cell constitutes; Sound alarm circuit is by musical film IC
2, loudspeaker Y, triode BG
2, resistance R
6And K switch
2Constitute; Optical alarm circuit is by triode BG
1, LED, resistance R
4And R
5, capacitor C
5And K switch
3Constitute; Power circuit is by transformer P, diode D
2Battery V and K switch
1Constitute.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN 02222201 CN2537073Y (en) | 2002-04-12 | 2002-04-12 | Visual distance warning device for preventing myopia |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN 02222201 CN2537073Y (en) | 2002-04-12 | 2002-04-12 | Visual distance warning device for preventing myopia |
Publications (1)
Publication Number | Publication Date |
---|---|
CN2537073Y true CN2537073Y (en) | 2003-02-19 |
Family
ID=33700162
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CN 02222201 Expired - Fee Related CN2537073Y (en) | 2002-04-12 | 2002-04-12 | Visual distance warning device for preventing myopia |
Country Status (1)
Country | Link |
---|---|
CN (1) | CN2537073Y (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104851413A (en) * | 2014-02-15 | 2015-08-19 | 岳景睿 | Infrared induction brightness control circuit |
CN105023402A (en) * | 2015-07-08 | 2015-11-04 | 安徽宝昱电子科技有限公司 | Myopia prevention assembly of screen device |
-
2002
- 2002-04-12 CN CN 02222201 patent/CN2537073Y/en not_active Expired - Fee Related
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104851413A (en) * | 2014-02-15 | 2015-08-19 | 岳景睿 | Infrared induction brightness control circuit |
CN105023402A (en) * | 2015-07-08 | 2015-11-04 | 安徽宝昱电子科技有限公司 | Myopia prevention assembly of screen device |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
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 |