CN2456664Y

CN2456664Y - Infrared reflective limiter for read/write distance and time

Info

Publication number: CN2456664Y
Application number: CN 00261471
Authority: CN
Inventors: 苏争宏
Original assignee: Individual
Current assignee: Individual
Priority date: 2000-12-20
Filing date: 2000-12-20
Publication date: 2001-10-31
Anticipated expiration: 2010-12-20

Abstract

The utility model relates to an infrared reflected type limiter for read/write distance and time, which is composed of a transmitting circuit, a receiving circuit, a control circuit, a speech circuit, a timing circuit, and a power supply circuit. With depending infrared reflection distance measuring and delay control, the utility model can always keep distance between eyes and books and time within a limited range. If the utility model exceeds the range, the utility model can just automatically send out a speech signal to remind people to pay attention. The utility model has the advantages of light weight, and convenient use and carry. The utility model can also be used for suspending on spectacles frames, and the utility model is ideal selected products of primary and secondary school students for preventing eye myopia and humpback occurrence and development.

Description

The time qualified device of infrared reflection formula reading/writing distance

This utility model is the time qualified device of a kind of infrared reflection formula reading/writing distance.

In recent years, the sickness rate of myopia of student rises year by year.According to 1997 " Chinese practical ophthalmology magazine ", somewhere hospital ophthalmology investigation 2-14 year child was totally 882 eyes, and wherein near-sighted prevalence is up to 51.2%.Excessively close eye is the main cause place that myopia takes place and develops.Because myopia not only takes place in long-time close eye easily, but also causes habitual hunchback or permanent deformity of spine because of bowing for a long time, bending over.This phenomenon has caused the great attention of relevant department.Showing according to documents and materials, in daily study, read and write each time generally to be no more than about 50 minutes, is about 30cm and keep the science of eye distance books to limit distance, can not be less than 23cm.If according to aforementioned requirement, can protect eyes, pre-myopia prevention takes place and development, prevents habitual bow-backed playing a positive role.Topic is gone back neither one measure preferably and method is realized but solve at present thoroughly around here.

The purpose of this utility model is to be provided with a kind of dependence infrared reflection range finding and time-delay control, can make in the scope that is limited to control between eyes and the books, as be greater than or less than limited range, just can send the time qualified device of infrared reflection formula reading/writing distance that the voice signal reminds people is noted automatically.

This utility model is such realization, it is made up of radiating circuit, receiving circuit, control circuit, sound circuit, timing circuit and power circuit, radiating circuit is to be the center with the integrated package, connects resistance, variable resistance, electric capacity, diode and regulator block, finishes launch mission; Receiving circuit also is to be the center with the integrated package, connects resistance, variable resistance, electric capacity and diode, for radiating circuit receives, precedingly puts, decoding and frequency-selecting; Control circuit is the center equally with the integrated package, connects resistance, variable resistance and electric capacity, finishes the voltage upset, and is back utmost point power supply after receiving the signal of emission; Sound circuit is the center equally with the integrated package, connects resistance, electric capacity, Zener diode and speaker, in the time of by radiating circuit and receiving circuit feedback signal, can point out automatically after obtaining powering and send voice signal; Timing circuit also is to be the center with the integrated package, connects resistance, electric capacity, microswitch and buzzer, but the limiting time scope, and sound by buzzer by its time scope; Power circuit connects and composes by battery, switch, electric capacity and regulator block, and it is to provide required power supply for radiating circuit, receiving circuit, control circuit, sound circuit and timing circuit.

The utility model is described in further detail below in conjunction with accompanying drawing embodiment.

Fig. 1 is circuit theory diagrams of the present utility model.

Fig. 2 is a circuit block diagram of the present utility model.

As shown in Figure 1, 2, this utility model is made up of radiating circuit (1), receiving circuit (2), control circuit (3), sound circuit (4), timing circuit (5) and power circuit (6), and radiating circuit (1) is with ic chip ₁NE555 is the center, connects resistance R ₁, R ₂, R ₃, variable resistance RP ₁, capacitor C ₁, C ₂, diode (LED) and regulator block IC ₆7803, resistance R ₁, R ₂, variable resistance RP ₁, capacitor C ₁Series connection successively in order, resistance R ₁Last termination power 3VDC positive pole, capacitor C ₁Following termination power 3VDC negative pole, resistance R ₁And R ₂The serial connection point connects ic chip ₁7 feet, variable resistance RP ₁And capacitor C ₁The serial connection point connects ic chip ₁, 2,6 bipods, ic chip ₁1 foot connects power supply 3VDC negative pole, and 4,8 bipods connect power supply 3VDC positive pole, and integrated package 5 feet connect capacitor C ₂Anode, capacitor C ₂Negative terminal connect power supply 3VDC negative pole, resistance R ₃An end be connected with the diode (LED) anode, its another termination power 3VDC positive pole, diode (LED) negative terminal connect ic chip ₁3.Receiving circuit (2) also is with ic chip ₂CX20106 is the center, connects resistance R ₄, R ₅, R ₇, variable resistance RP ₂, RP ₃, capacitor C ₃, C ₄, C ₅With diode TLP, ic chip ₂1 foot connects diode TLP negative terminal, the positive termination power 5VDC negative pole of diode TLP, resistance R ₄With capacitor C ₃Anode connects, capacitor C ₃Negative terminal connect power supply 5VDC negative pole, resistance R ₄The other end and ic chip ₂2 feet connect, ic chip ₂3 feet connect capacitor C ₅Anode, capacitor C ₅Negative terminal meet power supply 5V _DCNegative pole, ic chip ₂4 feet connect power supply 5VDC negative pole, its 5 foot connecting resistance R ₅-end, resistance R ₅Another termination power 5VDC positive pole, ic chip ₂6 feet connect capacitor C ₄Anode, capacitor C ₄Negative terminal meet power supply 5VDC negative pole, variable resistance RP ₂, RP ₃And resistance R ₇Series connection successively, variable resistance RP ₂Last termination power 5VDC positive pole, its lower end and variable resistance RP ₃Junction point connect ic chip ₂7 feet, ic chip ₂8 feet connect power supply 5VDC positive pole.Control circuit (3) is equally with ic chip ₃NE555 is the center, connects resistance R ₈, R ₉, variable resistance RP ₄, capacitor C ₆, C ₇, C ₈And C ₉, ic chip ₃1 foot connects the negative pole of power supply 5VDC, and its 2 foot connects capacitor C ₇Anode, and with the variable resistance RP of receiving circuit (2) ₂And RP ₃Junction point joins, capacitor C ₇Negative terminal connects the negative pole of power supply 5VDC, resistance R ₉An end and capacitor C ₉Anode connects, capacitor C ₉Negative terminal and power supply 5VDC negative pole join resistance R ₉Another termination ic chip ₃3 feet, ic chip ₃4,8 feet connect power supply 5VDC positive pole, and its 5 foot connects capacitor C ₈Anode, capacitor C ₈Negative terminal connect power supply 5VDC negative pole, resistance R ₈An end and variable resistance RP ₄And capacitor C ₆Series connection successively, its another termination power 5VDC positive pole, capacitor C ₆Negative terminal meets power supply 5VDC negative pole, variable resistance RP ₄With capacitor C ₆Anode serial connection point connects

ic chip

₃6,7 bipods.Sound circuit (4) is equally with IC ₄HFC5212 is the center, connects resistance R ₁₀, Zener diode DW, capacitor C ₁₀With speaker B, ic chip ₄1 foot connects power supply 5VDC negative pole, 2,5 feet connect Zener diode DW negative terminal and with control circuit (3) in resistance R ₉, capacitor C ₉The serial connection point join ic chip ₄5 feet and 3 foot parallel resistance R ₁₀, capacitor C ₁₀Positive termination ic chip ₄4 feet, its negative terminal connect the end of speaker B, another termination power 5VDC negative pole of speaker B.Timing circuit (5) also is with ic chip ₇NE555 is the center, connects resistance R ₁₁, R ₁₂, capacitor C ₁₃, C ₁₄, microswitch AN and buzzer M, resistance R ₁₁, R ₁₂And capacitor C ₁₃Be connected in series resistance R successively ₁₁Last termination power 6VDC positive pole, capacitor C ₁₃Negative terminal connects power supply 6VDC negative pole, resistance R ₁₁Lower end and R ₁₂The serial connection point connects ic chip ₇7 feet, resistance R ₁₂With capacitor C ₁₃Anode serial connection point connects

ic chip

₇2,6 feet, ic chip ₇4,8 feet connect power supply 6VDC positive pole, its 5 foot connects capacitor C ₁₄One end, capacitor C ₁₄Another termination power 6VDC negative pole, microswitch AN is connected in parallel on capacitor C ₁₃Positive and negative two ends.Power circuit (6) by battery E connect 6VDC, its negative terminal is the main power negative pole, positive termination K switch, when the K switch closure through connecing capacitor C ₁₁After be divided into two-way, the one road supplies with the ic chip of timing circuit (5) ₇And peripheral cell, regulator block IC is sent on another road to ₅Two-way is divided in 7805 backs, and the one road is the ic chip of receiving circuit (2), control circuit (3), sound circuit (4) ₂, IC ₃, IC ₄And the peripheral cell power supply, another road enters regulator block IC ₆7803 connect capacitor C ₁₂Ic chip for radiating circuit (1) ₁And peripheral cell power supply.

Work as IC ₁During output sequence square wave low level, infrared light emitting diode LED emission modulation of infrared rays light is by IC ₂Be center and its peripheral cell composition infrared radiation receiving circuit, reception diode TLP is by variable resistance RP ₃Identical with tranmitting frequency, and, make IC by optical filter S receiving infrared-ray signal ₂Finish preposition amplification, and work such as carrier wave, frequency-selecting, pulse, decoding; When TLP makes IC in qualification apart from the received signal Q that is reflected of 25-30cm ₃Set, its control circuit ic chip ₃3 feet output high level, and pass through resistance R ₇And stabilivolt DW voltage stabilizing, give the sound circuit ic chip ₄Working power is provided, promotes speaker B and sound; When infrared ray reception diode LED does not receive reflected signal Q, the control circuit ic chip ₃3 feet are low level, the sound circuit ic chip ₄No running voltage and the signal of not sounding.Press microswitch AN in the timing circuit, make ic chip ₇2 feet are 0 current potential, at this moment capacitor C ₁₃Pass through resistance R ₁₁, R ₁₂Be its charging, capacitor C after 50 minutes ₁₃Anode is charged to above 1/36VDC, ic chip ₇Reset, its 3 foot low level, buzzer M sounds.

The utility model has the advantages that to rely on infrared reflection range finding and time-delay control, can remain The distance of eyes and books and time are in limited range, if go beyond the scope, just can be automatic Send voice signal, remind people to note, and in light weight, easy to use and carry, also can hang Hanging on the spectacle-frame and use, is that present primary and secondary students are for preventing eye myopia and hunchback generation and sending out The ideal chose product of exhibition.

Claims

1, a kind of time qualified device of being made up of radiating circuit (1), receiving circuit (2), control circuit (3), sound circuit (4), timing circuit (5) and power circuit (6) of infrared reflection formula reading/writing distance is characterized in that: be with ic chip radiating circuit (1)) ₁Be the center, connect resistance R ₁, R ₂, R ₃, variable resistance RP ₁, capacitor C ₁, C ₂, diode (LED) and regulator block IC ₆Finish launch mission; Receiving circuit (2) also is with ic chip ₂Be the center, connect resistance R ₄, R ₅, R ₇, variable resistance RP ₂, RP ₃, capacitor C ₃, C ₄, C ₅With diode TLP, for radiating circuit receives, precedingly puts, decoding and frequency-selecting; Control circuit (3) is equally with ic chip ₃Be the center, connect resistance R ₈, R ₉, variable resistance RP ₄, capacitor C ₆, C ₇, C ₈And C ₉, finish the voltage upset, and receive that the back that transmits is back utmost point power supply; Sound circuit (4) is equally with IC ₄Be the center, connect resistance R ₁₀, Zener diode DW, capacitor C ₁₀With speaker B, obtain sending voice signal automatically after the power supply in the time of by radiating circuit (1) and receiving circuit (2) feedback signal; Timing circuit (5) also is with integrated IC ₇Be the center, connect resistance R ₁₁, R ₁₂, capacitor C ₁₃, C ₁₄, microswitch AN and buzzer, but the limiting time scope and is sounded by buzzer by its limiting time scope; Power circuit (6) is by battery E series connection, and negative terminal is the main power negative pole, positive termination K switch, when the K switch closure through connecing capacitor C ₁₁After be divided into two-way, the one road supplies with the ic chip of timing circuit (5) ₇And peripheral cell, regulator block IC is sent on another road to ₅Two-way is divided in the back, and the one road is the ic chip of receiving circuit (2), control circuit (3), sound circuit (4) ₂, IC ₃, IC ₄And the peripheral cell power supply, another road enters regulator block IC ₆Connect capacitor C ₁₂Integrated IC for radiating circuit (1) ₁And peripheral cell power supply.