CN2410694Y

CN2410694Y - Portable light apparent distance warning device for learning

Info

Publication number: CN2410694Y
Application number: CN 00213705
Authority: CN
Inventors: 黄建文; 曾庆霞; 杨建秀
Original assignee: Individual
Current assignee: Individual
Priority date: 2000-03-13
Filing date: 2000-03-13
Publication date: 2000-12-13
Anticipated expiration: 2010-03-13

Abstract

The utility model discloses a portable warning device for a learning light apparent distance, which comprises an outer housing, an apparent distance detection circuit which is arranged in the outer housing and a light detection circuit. The portable warning device for a learning light apparent distance can monitor whether the light intensity of the environment and learning and reading distance accord with requirements when learning and reading at any moment to avoid poor sight caused by the light intensity and reading distance which do not come up to the requirement.

Description

Portable study light sighting distance caution instrument

The utility model relates to a kind of portable study light sighting distance caution instrument.

Teenager's poor sight mainly is to have owing to suffer from various degree myopia, mainly is that light when reading is too dark or distance is too near and produce bathomorphic reason.Too closely make eye fatigue for fear of or distance too dark, need the distance often measuring the light luminance of reading environment and reading when because of light, but people when reading again toward back forgetting or ignoring these problems.

The purpose of this utility model provides whether satisfactory portable study light sighting distance caution instrument of a kind of light that can monitor reading environment at any time and reading distance.

For achieving the above object, the technical solution adopted in the utility model is as follows:

Portable study light sighting distance caution instrument comprises shell, is installed in the sighting distance testing circuit and the light testing circuit of enclosure.The sighting distance testing circuit is made of infrared ray sensor and signal processing circuit, and the light emitting diode of signal output part is installed on the outside surface of shell.The light testing circuit is made of on-off circuit that comprises photoresistance and the low-frequency oscillatory network that is connected the on-off circuit output terminal, the output terminal of on-off circuit and the output terminal of low-frequency oscillatory network have the light emitting diode of different colours, and light emitting diode is installed on the outside surface of shell.Shell is the shell of casper, and the bottom has battery case.

After adopting technique scheme, originally portable at ordinary times study light sighting distance caution instrument can be used as bibelot and is placed on the desk, when study or reading, turn on the power switch, sighting distance testing circuit and light testing circuit are started working, and at any time monitoring result is come out by diode displaying, reminds people is noted.

Further specify the utility model below in conjunction with drawings and Examples:

Fig. 1 is the front view of the shell moulding of an embodiment of the present utility model;

Fig. 2 is the sighting distance testing circuit of an embodiment of the present utility model and the circuit diagram of light testing circuit.

As shown in Figure 1, the moulding that the shell 1 of portable study light sighting distance caution instrument has cartoon animals, two eyes of animal are respectively LED 2 in the light testing circuit and the LED 3 in the sighting distance testing circuit, LED 1 in the light testing circuit is installed on the nose of animal, on animal-shaped shell, is also had photoresistance RL1 and RL2 and infrared ray sensor VB in addition.

As shown in Figure 2, sighting distance testing circuit 2 is made of infrared ray sensor VB and signal processing circuit, and signal processing circuit mainly is made of integrated circuit (IC) 1 and peripheral circuit thereof, and integrated circuit (IC) 1 adopts YX7603C, 7 pin are its signal input parts, extremely link to each other with the E of infrared ray sensor VB; 14 pin are its another signal input parts, connect positive source by photoresistance RL2 on the one hand, connect power cathode by divider resistance R8 simultaneously; 13 pin are its signal output parts, and when the infrared ray that the too weak or infrared ray of sending and receiving optical diode LED3, the light that receives as photoresistance RL2 is received by infrared ray sensor VB was too strong, LED 3 was luminous.After the infrared ray of human body radiation is absorbed by infrared ray sensor VB, promptly there is signal to be input to 7 pin of IC1, two-stage by the IC1 inside low-frequency amplifier that directly is coupled amplifies, enter comparer through low-pass filter again, and then by latch, control circuit is coupled to exciting circuit, export from 13 pin at last.Adjust potentiometer RP2 and can regulate the intensity that enters the signal of IC1 from infrared ray sensor VB, make the luminous horizon range of LED3 thereby set.

Photoresistance RL1 in the light testing circuit 3 and regulator potentiometer RP1 constitute bleeder circuit, this bleeder circuit and switch triode VT1 have constituted photosensitive switch circuit jointly, the collector of triode VT1 is the signal output part of this photosensitive switch circuit, the collector of triode VT1 is connected to LED 1 and is used for indicating operating status, the collector of VT1 also links to each other with the base stage of another switch triode VT2 simultaneously, VT2 is controlling the duty of low-frequency oscillatory network IC2 as another switch, the S end of low-frequency oscillatory network IC2 is signal output part, sending and receiving optical diode LED2.When ambient light was strong, photoresistance RL1 was low resistance, and triode VT1 base stage is a high level, the VT1 conducting, and LED 1 electrified light emitting, triode VT2 ends, and low-frequency oscillatory network IC2 does not work, and LED2 is not luminous; When ambient light was more weak, photoresistance RL1 was high resistance, and triode VT1 base stage is a low level, and VT1 ends, and LED 1 is not luminous, triode VT2 conducting, and the low-frequency oscillatory network IC2 work of switching on, the LED2 flicker is luminous.Regulator potentiometer RP1 can make the brightness range of the luminous light of LED2.

The parameter of a main element among Fig. 2: RL1, RL2:MG45; IC1:YX7603C; IC2:KD-01X; VT1, VT2:9011; RP1:47K Ω; RP2:470K Ω; RP3:1M Ω; R1:1K Ω; R2:300 Ω; R3:220 Ω; R4:220K Ω; R5:100K Ω; R6:3K Ω; R7:1.5M Ω R8:47K Ω; Cl:4.7 μ F; C2:100 μ F; G1, G2:3V;

Claims

1, portable study light sighting distance caution instrument is characterized in that: it comprises shell (1), is installed in shell (1) inner sighting distance testing circuit (2) and light testing circuit (3).

2, portable study light sighting distance caution instrument according to claim 1, it is characterized in that: sighting distance testing circuit (2) is made of infrared ray sensor (VB) and signal processing circuit, and the light emitting diode of signal output part is installed on the outside surface of shell (1).

3, portable study light sighting distance caution instrument according to claim 1, it is characterized in that: light testing circuit (3) is made of on-off circuit that comprises photoresistance (RL1) and the low-frequency oscillatory network that is connected the on-off circuit output terminal, the output terminal of on-off circuit and the output terminal of low-frequency oscillatory network have the light emitting diode of different colours, and light emitting diode is installed on the outside surface of shell (1).

4, portable study light sighting distance caution instrument according to claim 1, it is characterized in that: shell (1) is the shell of casper, and the bottom has battery case.