CN2557794Y

CN2557794Y - Nearsightedness-proof writing desk-lamp

Info

Publication number: CN2557794Y
Application number: CN 02215867
Authority: CN
Inventors: 徐惠吉; 茅辉
Original assignee: Individual
Current assignee: Individual
Priority date: 2002-02-21
Filing date: 2002-02-21
Publication date: 2003-06-25
Anticipated expiration: 2012-02-21

Abstract

An anti-myopia writing desk lamp includes a lamp holder, a lamp post, a bulb, a lamp shade and a light adjusting switch. A circuit board provided with electronic components is arranged in the lamp holder; an infrared transmitting and receiving window connected with an infrared circuit is arranged on the front end of the lamp shade; a photosensitive resistance connected with an electronic metering circuit is arranged above the bulb. When the visual distance of the user is too close or the posture is not right, the utility model can give automatic alarm and time delay to turn off the light. The light can also be automatically turned off when the light is adjusted too bright or too dark, so as to remind people of adjusting lighting brightness. The utility model has very good effect in preventing juvenile myopia.

Description

The myopia prevention desk lamp

Technical field

The utility model be a kind of myopia prevention use write lighting.

Background technology

Because study burden of students ' is overweight, therefore students in middle and primary schools' rate of myopia rises year by year in recent years.The myopia overwhelming majority is because reading and writing posture are incorrect and bring out, so rationally regulate the best method that the environment for use of eyes and time are pre-myopia prevention.Because the people concentrates when entering read-write state, therefore rely on people's voluntary observance with the eye rule fully, and the preferable distance that remains head and books is the comparison difficulty.For this reason, various myopic-preventing desk lamps, the lamp of writing that especially has infrared alarming is come out one after another.The patent No. is " 92220148.x ", " myopia prevention clock multi-purpose computer lamp ", it has infrared reflection and receiver window on the principal post top of lamp socket, and can basis whether absorb the infrared ray that human body reflects, control the bright of lamp or go out, but because the infrared reflection and the receiver window of this lamp all is contained on the principal post of lamp, therefore reads and turn over book, stirring also of paper can reflected infrared ray, cause lamp to go out, give and read and write and make troubles.The patent No. is " 99251430.4 ", " infrared induction myopia prevention desk lamp ", it is equipped with two telescopic arms on lamp socket, infrared and receiving system are equipped with in its top, when sighting distance is crossed near or fault, infrared induction disconnects the desk lamp circuit, and bulb is extinguished.But stretch out two arms on the lamp socket, look to be most unseemly.And above-mentioned two kinds write lamp and all do not had the strong and weak warning function of light, light cross strong or cross a little less than eyes are upset, damage to eye.

Summary of the invention

The purpose of this utility model is at the deficiencies in the prior art and defective, for teenager especially students in middle and primary schools provides a kind of myopia prevention desk lamp.This desk lamp comprises lamp socket, lamp stand, bulb, lampshade and dimmer switch, and the wiring board that electronic devices and components are housed is installed in the lamp socket, and infrared and the receiver window that is connected with the infrared ray circuit is housed at the lampshade front end; In lampshade, the photo resistance that is connected with the electronic metering circuit is equipped with in the top that is positioned at bulb.

When writing or read, cross closely as sighting distance and can send chimes of doom, and after continuing the several seconds, automatically light is extinguished.When using light, bright or dark excessively as light is transferred, also can automatically light be extinguished, it can in time remind you to correct sighting distance and lamplight brightness, and the prevention adolescent myopia is had good effect.

Description of drawings

Fig. 1 is the utility model structural representation.

Fig. 2 is the electrical block diagram of the utility model wiring board.

Fig. 3 is the utility model circuit diagram.

Label among the figure: 1-lampshade, 2-photo resistance, 3-infrared and receiver window, 4-bulb, 5-set screw, 6-lamp stand, 7-dimmer switch, 8-lamp socket, 9-wiring board.

Embodiment

As shown in Figure 1, this desk lamp comprises lamp socket 8, lamp stand 6, bulb 4, lampshade 1, dimmer switch 7 and lamp holder set screw 5, electronic circuit board 9 is installed in the lamp socket 8, front end at lampshade 1 is equipped with infrared and the receiver window 3 that is connected with the infrared ray circuit, and the photo resistance 2 that is connected with the electronic metering circuit is housed above bulb.

Fig. 2 is the electrical block diagram of infrared ray circuit and electronic metering circuit.The infrared ray circuit comprises: stabilized voltage power supply, reception amplifying circuit, oscillating circuit, radiating circuit, delay circuit, warning circuit and switch executive circuit.As shown in Figure 3, wherein C2, the C3 and 7809 that use by power transformer B, for filtering of stabilized voltage power supply forms.Wherein receiving amplifying circuit is made up of RW2, IC1 (HS0038); Oscillating circuit is made up of IC2, R6, C4, C5, C6; Radiating circuit is made up of R5, R4, D4, D5; The warning circuit that delay circuit that C7 forms and R7 musical film are formed; The switch executive circuit is made up of D9, J, R15, R16.

The electronic metering circuit comprises luma samples circuit, brightness regulating circuit, intednsity circuit and switch executive circuit.As shown in Figure 3, wherein the luma samples circuit is made up of R8, RW3, R9; Intednsity circuit is made up of R18, R11, RW4, RW5, R12, IC3, K; Brightness regulating circuit is made up of D1, D2, R1, RW1, R3, C1.

Stabilized voltage power supply becomes the 220V alternating current into the 9V DC power supply.6 pin by integrated chip IC2 connect capacitor C 4, the center frequency of oscillation of resistance R 6 decision internal oscillators, and the 5 pin generation square wave oscillation signal by IC2 sends the infrared pulse signal by infrared transmitting tube D4 after triode D4 amplifies.With receive amplification module IC2 (HS0038) and join and transfer the signal of telecommunication to after infrared receiving tube D3 receives the infrared pulse signal, amplify and feed back to 3 pin of IC2 through inside, make the frequency modulating signal of radiating circuit consistent with the center frequency of oscillation of oscillator.Because IC2 has phase-locked loop circuit, make infrared and receive the influence that is not subjected to extraneous factor.Cross when near (less than one chi time) when sighting distance, people's head is in the infrared ray receiving area, because the head reflection is from the infrared ray of infrared transmitter, make infrared radiation receiving circuit receive signal, the 8 pin output low levels of IC2 drive warning circuit, and delay capacitor C7 discharge simultaneously is after the several seconds, D6 becomes from conducting and ends, make IC3 lose input signal, can not drive the D9 conducting, and to make voltage difference on the relay J coil be zero, the relay J normally open contact resets, and bulb 4 extinguishes automatically.

When normal sighting distance state, the D6 conducting has a stable voltage on the sample circuit of being made up of R8, RW3 and photo resistance 4.When dimmer switch 7 was bright by shadow, the resistance of R4 and voltage caused the 3 pin input voltages of IC3 (LM358) to reduce from large to small, and when its 1 pin output voltage during less than D9 base stage operating voltage, D9 were ended, and the relay J normally open contact resets, and lamp puts out.When dark, otherwise R9 resistance and voltage increase light gradually by high light, and when the 5 pin output voltages of IC3 arrived certain value greatly, its of 7 pin output can drive the voltage that D7 conducting, D9 end, and the relay J normally open contact resets, and lamp puts out.Thereby reach light when too bright or too dark, can turn off the light automatically, remind you should again houselights be adjusted to a suitable scope.

Claims

1, a kind of myopia prevention desk lamp, it comprises lamp socket (8), lamp stand (6), bulb (4), lampshade (1) and dimmer switch (7), the wiring board (9) that electronic devices and components are housed is installed in the lamp socket, it is characterized in that the front end of lampshade is equipped with infrared and the receiver window (3) that is connected with the infrared ray circuit.

2, myopia prevention desk lamp according to claim 1 is characterized in that described infrared ray circuit is by stabilized voltage power supply, receives amplifying circuit, oscillating circuit, radiating circuit, delay circuit, warning circuit and switch executive circuit.

According to claim 1,2 described myopia prevention desk lamps, it is characterized in that in described lampshade that 3, a photo resistance that is connected with the electronic metering circuit (2) is equipped with in the top that is positioned at bulb.

4, myopia prevention desk lamp according to claim 3 is characterized in that described electronic metering circuit is made up of luma samples circuit, brightness regulating circuit, intednsity circuit and switch executive circuit.