CN201828258U

CN201828258U - Automatic alarm circuit for detecting distance from eyes to displayer

Info

Publication number: CN201828258U
Application number: CN2010205296127U
Authority: CN
Inventors: 陈扬
Original assignee: Individual
Current assignee: Individual
Priority date: 2010-09-15
Filing date: 2010-09-15
Publication date: 2011-05-11
Anticipated expiration: 2020-09-15

Abstract

The utility model discloses an automatic alarm circuit for detecting distance from eyes to a displayer, which aims at automatically detecting the distance from the eyes of a user to the displayer and determining whether to give an alarm according to a detection result, thus reminding the user of facing a computer at a proper distance and further protecting the eyes. The automatic alarm circuit consists of an infrared detector, a power detector, a comparator, a timing controller, a square wave clock generation circuit, a buzzer and an LED (light emitting diode) lamp. If the infrared detector detects that the distance from the eyes of the user to the displayer is shorter than 60cm, a high level control signal is output through the comparator and the timing controller so as to control the buzzer to buzz and the LED lamp to flash, and the buzz and the flash can serve as alarm signals when the distance from the eyes to the displayer is too short. The automatic alarm circuit is integrated in a panel border of the displayer of the computer and directly supplied with power by a power management module in the displayer, and has the characteristics of being simple to realize and safe and reliable. The realizable circuit is provided for reminding the computer user of keeping a proper distance to face the computer.

Description

A kind of automatic alarm circuit of surveying eyes and display distance

Technical field

The utility model belongs to infrared electronic technology, be specifically related to a kind of automatic alarm circuit of surveying eyes and display distance, this circuit can be surveyed the distance of computer user eyes and display, and reports to the police automatically according to result of detection, reminds the user to keep and the suitable distance of display.Be applicable to various displays, and have realize simple, be easy to integrated, the characteristics of directly powering by display interior power supply management module.

Background technology

Modern society enters the information age comprehensively, computer spreads to the every aspect in people's life, people's life, work and entertainment way have thoroughly been changed, computer is when bringing convenience to people, when having brought very big burden, especially eyes and display hypotelorism also for user's eyes.Scientific research shows that people's eyes and indicator screen distance are that 60 centimetres (cm) are the most suitable.Particularly, teen-age eyes are among the growth, but the sense of self-protection weakness, are easy to cross for a long time closely stare at display, and this will certainly cause very major injury to eyes, influences teen-age growing up healthy and sound.

Therefore, provide a kind of and prevent that the warning circuit of eyes and display hypotelorism from being very necessary.Utilize infrared acquisition to realize Determination of distance, sending into processing of circuit then is a kind of technical scheme.Infrared detection technique is comparative maturity; Chinese patent 00258739 discloses a kind of anti-sleepy reminiscences that utilizes infrared acquisition; it is a kind of panalarm that utilizes the action of infrared detection people eyelid; but also useless at present infrared detection technique is used on the computer monitor measuring distance with the protection eyes; there are not other technologies to provide to prevent the warning circuit of eyes and display hypotelorism yet; therefore how integrated distance alarm circuit on display needs the solution of utility model.

Summary of the invention

The purpose of this utility model is to provide a kind of infrared acquisition circuit that is integrated on the display frame, comes monitoring eye and display distance, and according to monitoring that the result reports to the police automatically, reminds the computer user to keep and the suitable distance of computer monitor, with the protection eyes.

A kind of automatic alarm circuit of surveying eyes and display distance that the utility model provides is characterized in that: this circuit comprises that infrared eye, power detector, comparer, timing controller, square wave clock produce circuit, hummer and LED lamp; Can be integrated in easily in the frame of display pannel, provide power supply to supply with by display interior power supply management module;

Infrared eye, power detector, comparer, timing controller, square wave clock produces circuit, the feeder ear of hummer and LED lamp, all link to each other with the power supply management module of display interior, the output terminal of infrared eye links to each other with the input end of power detector, the output terminal of power detector links to each other with the positive input terminal of comparer, the negative input end of comparer links to each other with reference voltage, the output of comparer links to each other with the input of timing controller, the output of timing controller links to each other with the input of hummer with the LED lamp, and the clock signal control end of comparer and timing controller all produces circuit with square wave clock and links to each other.

The square wave frequency that square wave clock produces the circuit generation is 1kHz.

Technical scheme described in the utility model can be surveyed the distance of computer user eyes and display automatically when display is worked, and reports to the police automatically according to result of detection.When circuit detects human eye and display distance less than 60cm; can make the decision that produces high level control hummer buzzing and the flicker of LED lamp automatically; remind the hypotelorism of user's eyes and display; adjust posture up to the user and make the distance of eyes and display just remove warning, reach the purpose of protection eyes above 60cm.And this circuit can be installed in the frame of display pannel, is directly powered by display interior power supply management module.This circuit can effectively solve the warning problem of eyes and display hypotelorism, for the teenager and the personnel that use computer for a long time keep reasonably during in the face of display that distance provides a kind of reality feasible method.

Description of drawings

Fig. 1 is the circuit block diagram of the utility model example;

Fig. 2 is the circuit diagram that 1kHz square wave clock of the present utility model produces circuit;

Fig. 3 is comparator circuit figure of the present utility model.

Embodiment

Below by describing the utility model more in detail by drawings and Examples.

As shown in Figure 1, eyes and display distance alarm circuit are made up of infrared eye 1, power detector 2, comparer 3, timing controller 4, square wave clock generation circuit 5, hummer 6 and LED lamp 7.The square wave frequency that square wave clock produces circuit 5 generations is 1kHz.

Infrared eye 1, power detector 2, comparer 3, timing controller 4, square wave clock produces circuit 5, the feeder ear of hummer 6 and LED lamp 7, all link to each other with the power supply management module of display interior, the output terminal of infrared eye 1 links to each other with the input end of power detector 2, the output terminal of power detector 2 links to each other with the positive input terminal of comparer 3, the negative input end of comparer 3 links to each other with reference voltage, the output of comparer 3 links to each other with the input of timing controller 4, the output of timing controller 4 links to each other with the input of hummer 6 with LED lamp 7, and the clock signal control end of comparer 3 and timing controller 4 produces circuit 5 with equal square wave clock and links to each other.

The infrared ray of 10 microns (μ m) that user's eyes that infrared eye 1 receives zone, display dead ahead are sent, produce power signal P1 according to receiving infrared-ray intensity and be sent to power detector 2, power detector 2 calculates the distance of user's eyes and display according to power signal P1, and produce and the input end that is sent to comparer 3 apart from the voltage signal V1 that is directly proportional, if the distance of user's eyes and display is greater than 60cm, then the voltage signal V1 that produces of power detector 2 through comparer 3 and reference voltage Vref relatively after output voltage V 2 be low level, if user's eyes and display distance is less than 60cm, then voltage signal V1 through comparer 3 and reference voltage Vref relatively after output voltage V 2 be high level.Voltage signal V2 is sent to the input end of timing controller 4, timing controller reads in input voltage signal V2 one time at the rising edge of each clock period, if voltage signal V2 is a low level, then timing controller is resetted and output low level, if voltage signal V2 be high level then timing controller begin and keep counting, if gate time reaches 10 seconds, timing controller 4 high level of output also keep high level state, and whenever input end detects low level all resets and output low level to timing controller 4 immediately.The clock signal of comparer 3 and timing controller 4 produces circuit 5 by square wave clock and produces.The voltage signal V3 of timing controller 4 outputs is fed to the input end of hummer 6 and LED lamp 7, voltage signal V3 is controlling the switch enable of hummer 6 and LED lamp 7, if voltage signal V3 is a high level, then hummer 6 and LED lamp 7 are opened, hummer 6 beginning buzzings, 7 flickers of LED lamp; If voltage signal V3 is a low level, then hummer 6 and LED lamp 7 are closed.

In conjunction with Fig. 1 and Fig. 2, the frequency that square wave clock in the utility model produces circuit 5 generations is the square-wave signal of 1kHz, as the clock signal of timing controller 4 and the clock signal of comparer 3 inner d type flip flops, square wave clock produces signal circuit 5 usefulness integrated chips 555 and builds with the resistance capacitance combination.By setting the parameter of R1, R2 and C1, coming the generation cycle is the square-wave signal of 1kHz.

In conjunction with Fig. 1 and Fig. 3, the comparer 3 in the utility model compares the voltage signal V1 and the reference voltage Vref of power detector 2 outputs; Reference voltage Vref is obtained through electric resistance partial pressure by supply voltage; Voltage comparator in the comparer adopts integrated chip LMV331; Signal V12 relatively sends into d type flip flop through behind the delay unit, and delay unit is made up of Sheffer stroke gate and phase inverter, and the clock signal of d type flip flop is provided through phase inverter by the clock signal that square wave clock produces circuit 5 generations.D type flip flop is used for latch signal V12, and the time of latching is one-period, and the signal V2 that comparator circuit 3 produces is sent to timing controller 4.

In conjunction with Fig. 1, the 10 μ m infrared energies that infrared eye detects in the utility model, be sent to power detector and produce a voltage signal that is directly proportional with energy, user's head has determined ultrared energy from the distance of display, also just determined the amplitude of voltage signal, distance is near more, and the amplitude of voltage signal is big more.When user's eyes and display distance less than 60cm, the voltage signal amplitude that power detector produces will make comparer export high level above reference voltage Vref, timing controller begins counting, when gate time surpasses 10 seconds, produce high level output, make the flicker of hummer buzzing and LED lamp.When the user adjust distance with display up to distance greater than 60cm, the comparer output low level, counter resets immediately and output low level is closed hummer and LED lamp.Thereby realized the distance of automatic detection user eyes and display, and judged whether to report to the police.

Claims

1. automatic alarm circuit of surveying eyes and display distance is characterized in that: this circuit comprises that infrared eye (1), power detector (2), comparer (3), timing controller (4), square wave clock produce circuit (5), hummer (6) and LED lamp (7);

Infrared eye (1), power detector (2), comparer (3), timing controller (4), square wave clock produces circuit (5), the feeder ear of hummer (6) and LED lamp (7), all link to each other with the power supply management module of display interior, the output terminal of infrared eye (1) links to each other with the input end of power detector (2), the output terminal of power detector (2) links to each other with the positive input terminal of comparer (3), the negative input end of comparer (3) links to each other with reference voltage, the output of comparer (3) links to each other with the input of timing controller (4), the output of timing controller (4) links to each other with the input of hummer (6) with LED lamp (7), and the clock signal control end of comparer (3) and timing controller (4) all produces circuit (5) with square wave clock and links to each other;

The square wave frequency that square wave clock produces circuit (5) is 1kHz.