CN2537015Y

CN2537015Y - Double color diode inspector

Info

Publication number: CN2537015Y
Application number: CN 02225028
Authority: CN
Inventors: 黎竹波
Original assignee: Shunda Computer Factory Co Ltd
Current assignee: Shunda Computer Factory Co Ltd
Priority date: 2002-01-09
Filing date: 2002-01-09
Publication date: 2003-02-19
Anticipated expiration: 2012-01-09

Abstract

The utility model relates to a detection device for a bicolor light diode, mainly used for detecting whether the installation of the bicolor light on the liquid crystal display key-press board is correct, which comprises a detection circuit, a comparing circuit and an alarm circuit. A red light pin and a green light pin are connected with the detecting end of the detection circuit; taking use of the characteristic that the earth impedance of the red light and the green light are different, the two pins are connected with the pull-up resistances with the same value; then the comparing circuit compares the voltages of the two pins and outputs the comparing result to the alarm circuit; when the polarity of the bicolor light is incorrect, the comparing circuit outputs the high voltage and causes the alarm circuit to work and to make alarms; when the polarity of the bicolor light is correct, the comparing circuit outputs low voltage and the alarm circuit does not work. The process is used to detect whether the installation of the bicolor diode is correct.

Description

The bi-colour light diode detection device

Technical field:

The utility model is about a kind of pick-up unit, mainly is whether be used for the installation of the bi-colour light on the detection LCD monitor keypad correct.

Background technology:

Produce in the liquid crystal display substrate process a large amount of, to test the bi-colour light on the keypad, whether whether normal installation luminous or red light and green light is correct to see it, usual way is at this bi-colour light, be connected in series current-limiting resistance respectively on two pins of green light and red light, add suitable voltage, and in the loop serial connection push switch, circuit turn-on when switch cuts out, can see luminous color detects bi-colour light by the operator normally luminous and judge whether the installation of red light pin and green light pin is correct.Miss through regular meeting but depend the detection mode that color judges like this alone, no foolproof function just can be found after the system of being assembled into, and will dismantle the whole system complete machine and just can do over again this moment, brings inconvenience to production.

Summary of the invention:

Fundamental purpose of the present utility model provides a bi-colour light diode detection device, and it comprises a testing circuit, a comparator circuit, a circuit for alarming.Be connected with the pull-up resistor that red light pin and green light pin also are connected to a similar resistance respectively thereon in the test side of testing circuit, with a comparator circuit this bipod voltage is made comparisons, comparative result is input to a circuit for alarming circuit, to detect the bi-colour light diode, utilize this device, whether the installation that can detect bi-colour light accurately is correct, gives and produces and operate and brought very big convenience.

Illustration:

Below in conjunction with most preferred embodiment and accompanying drawing the utility model bi-colour light diode detection device is described in further detail:

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

Specific embodiment:

Please see Figure shown in 1, this bi-colour light diode detection device includes a testing circuit 10, comparator circuit 20, circuit for alarming 30, power circuit 40.

In the testing circuit 10, comprise a green light 101, one red lights 102, pull-up resistor 103, pull-up resistor 104.The equal ground connection of the output terminal of green light 101 and red light 102, the input circuit of green light connects and draws resistance 103, the input circuit of red light to connect to draw resistance 104, and pull-up resistor 103 is identical with the resistance of pull-up resistor 104, be 330 ohm, and the other end of two pull-up resistors links to each other with power circuit 40 all.

Comparator circuit comprises a comparer 201, comparer 202, pull-up resistor 203, pull-up resistor 205, divider resistance 204 and divider resistance 206.The input end of green light 101 links to each other with the positive input terminal of comparer 201, the input end of red light 102 links to each other with the negative input end of comparer 201, and (this is meant the connected mode when two lamp polarity are correct, when polarity is incorrect, the input end of green light 101 links to each other with the negative input end of comparer 201, the input end of red light 102 links to each other with the positive input terminal of comparer 201), the output terminal of comparer 201 is received the positive input terminal (comparer 202 has been effects that secondary amplifies) of comparer 202, and it is one kilohm pull-up resistor 203 that the output terminal of comparer 201 is connected to a resistance, the negative input end of comparer 202 is connected to divider resistance 204 and divider resistance 206, wherein the resistance of divider resistance 204 is 330 ohm, the resistance of divider resistance 206 is 180 ohm, the equal ground connection of earth terminal of divider resistance 206 other ends and comparer 201, the output terminal of comparer 202 is connected to a pull-up resistor 205, its resistance is 330 ohm, in addition, pull-up resistor 203, the other end of pull-up resistor 205, the other end of divider resistance 204, and the power end of comparer 201 all links to each other with power circuit 40.

Circuit for alarming includes a triode 301, triode 302, music apparatus 303 and an amplifier 304.The base stage of comparer 202 output terminals and triode 301 links to each other, the collector of triode 301 links to each other with the collector of triode 302, one input end of the emitter of triode 301 and amplifier 304 links to each other, the base stage of triode 302 links to each other with the output terminal of music apparatus 303, its grounded emitter, the power end of music apparatus 303 links to each other with power circuit 40, earth terminal ground connection, and the other end of amplifier 304 links to each other with power circuit 40.

Power circuit 40 is made up of a rectification circuit 401 and a filtering circuit 402.

When green light 101 and red light 102 polarity are correct, because pull-up resistor 103 is identical with the resistance of pull-up resistor 104, because the wavelength of ruddiness and green glow is different, when the brightness of the brightness of green light and red light equates, the light that red light and green light could be sent is mixed into orange when LCD operate as normal (general pilot lamp be shown as yellow) of standard, and people's eyes are greater than susceptibility to green to the susceptibility of redness, so have only when the ratio of green light material during greater than the ratio of red light material, just can make the brightness of green light seem to equate with the brightness of red light, the impedance of green light is also just greater than the impedance of red light like this, and make that the earth impedance of red light and green light is different, because the earth impedance of green light pin is greater than the earth impedance of red light pin, so the current potential of the positive input terminal of comparer 201 is lower than the current potential of its negative input end, comparer 201 is output as electronegative potential, at this moment, the current potential of the positive input terminal of comparer 202 is lower than the current potential of its negative input end, comparer 202 output electronegative potentials, triode 301 ends, because the collector of triode 301 links to each other with triode 302 collectors, triode 302 ends, because the base stage of triode 302 and the output terminal of music apparatus 303 link to each other, music apparatus 303 ends, because the emitter of triode 301 and an end of amplifier 304 link to each other, amplifier 304 is not worked, and promptly alarm song does not ring.

When green light 101 and red light 102 polarity are incorrect, the current potential of the positive input terminal of comparer 201 is higher than the current potential of its negative input end, comparer 201 is output as noble potential, at this moment, the current potential of the positive input terminal of comparer 202 is higher than the current potential of its negative input end, comparer 202 output noble potentials, triode 301 conductings, because the collector of triode 301 links to each other with triode 302 collectors, triode 302 conductings are because the base stage of triode 302 and the output terminal of music apparatus 303 link to each other, music apparatus 303 conductings, because the emitter of triode 301 and an end of amplifier 304 link to each other, amplifier 304 work, alarm song sounds.

In sum, because the earth impedance of red light 102 and green light 101 is different, utilize the current potential of the comparer 201 comparisons two lamp input ends in the comparator circuit, use again than device 202 and carry out the secondary amplification, comparative result is input to circuit for alarming 30, whether connects instead, utilize this device to judge green light and red light, whether the installation that can detect bi-colour light accurately is correct, gives and produces and operate the very big convenience that arrived.

Above-mentioned the utility model only illustrates with most preferred embodiment, and to being familiar with the personnel of this skill, when carrying out various variation examples, only these change example, all should be included in the spirit and scope of the utility model.

Claims

1, a bi-colour light diode detection device, it comprises a testing circuit, a comparator circuit, one circuit for alarming, one power circuit, above-mentioned testing circuit, comparator circuit, circuit for alarming, power circuit electrically connects mutually to each other, and it is characterized in that: an input end of comparator circuit connects one first luminophor, another input end of comparator circuit connects one second luminophor, and the light wavelength difference sent of these two luminophors.

2, bi-colour light diode detection device according to claim 1, it is characterized in that: in the described testing circuit, comprise two detected luminophors, detected luminophor is connected to the pull-up resistor of similar resistance, the equal ground connection of the other end respectively at the input end of comparator circuit.

3, bi-colour light diode detection device according to claim 1, it is characterized in that: described comparator circuit includes one first comparer and one second comparer, the positive-negative input end of this first comparer links to each other with the pin of tested luminophor respectively, its output terminal links to each other with the positive input terminal of this second comparer, and the negative input end of this second comparer then connects a reference voltage.

4, bi-colour light diode detection device according to claim 1, it is characterized in that: described circuit for alarming includes one first triode, one second triode, one music apparatus and an amplifier, the output terminal of above-mentioned comparator circuit links to each other with the base stage of first triode, the collector of first triode links to each other with the collector of second triode, one end of the emitter of first triode and amplifier links to each other, the grounded emitter of second triode, and the output terminal of its base stage and music apparatus joins.