CN209044000U - It is a kind of for detecting the portable test pencil of ITO pattern route - Google Patents

Abstract

It is a kind of for detecting the portable test pencil of ITO pattern route involved by the utility model, including test pencil ontology, the test pencil ontology includes a shell, the circuit board being mounted in a shell and the probe a and probe b that are connect with circuit board, circuit board includes detection circuit, detection circuit includes power supply, switch K1, three-terminal voltage-stabilizing pipe, resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, voltage comparator a, voltage comparator b, light emitting diode, triode and buzzer, when the ITO pattern route that need to be detected is without short circuit, lumination of light emitting diode, buzzer is not rung, probe is in off state；When the ITO pattern route that need to be detected has short circuit, light emitting diode goes out, and driving buzzer issues the sound, probe is in short-circuit condition, rapidly and accurately detects whether ITO pattern route has short-circuit generation by the test pencil, simple to operate, and it is easy to carry, it is cheap.

Description

It is a kind of for detecting the portable test pencil of ITO pattern route

Technical field

The utility model relates to electrician tool technical fields, more particularly, to a kind of for detecting ITO pattern route just Take formula test pencil.

Background technique

LCD is manufactured in production process, and after overetch demoulding, ITO pattern route is completed.But ITO route is more and intensive, needs Want between staff's detection line and line with the presence or absence of short-circuit conditions, common detection mode be with microexamination, but this There are own shortcomings for kind detection mode: 1, detecting route under the microscope, detection speed is slow, reduces efficiency；2, endless to etching Full route cannot differentiate its lines completely, and the accuracy of detection is low；3, detection instrument (microscope) is excessive, it has not been convenient to take Band, so detection process is also inconvenient, so surveying in ITO pattern route in detection, one kind can quickly detect ITO pattern line Road, accuracy in detection is high, and portable tool is particularly important.

Utility model content

The technical problem to be solved by the utility model is to provide a kind of detection speed is fast, and the use that accuracy in detection is high In the portable test pencil of detection ITO pattern route.

The utility model is the technical scheme adopted is that a kind of for detecting the portable test pencil of ITO pattern route, packet Test pencil ontology is included, the test pencil ontology includes a shell, the circuit board being mounted in a shell and the spy connecting with circuit board Needle a and probe b, circuit board include detection circuit, and detection circuit includes power supply, switch K1, three-terminal voltage-stabilizing pipe, resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, voltage comparator a, voltage comparator b, light emitting diode, triode and buzzer, The anode of power supply is connect by switch K1 with the input terminal of three-terminal voltage-stabilizing pipe, and resistance R1 is in parallel with resistance R3, resistance R3 and resistance R4 is in parallel, and resistance R4 is in parallel with resistance R5, and the one end resistance R1 connect the other end with the output end of three-terminal voltage-stabilizing pipe and resistance R2 goes here and there Connection, the R2 series connection other end are connect with probe b, and the one end resistance R3 is with the output end of the three-terminal voltage-stabilizing pipe connection other end compared with voltage The non-inverting input terminal of device a connects, the non-inverting input terminal of the non-inverting input terminal of voltage comparator a and voltage comparator b with probe a Connection, the one end resistance R4 connect the other end with the output end of three-terminal voltage-stabilizing pipe and connect with the output end of voltage comparator a, resistance R5 One end connect the other end with the output end of three-terminal voltage-stabilizing pipe and the collector of triode connects, buzzer one end and three-terminal voltage-stabilizing pipe Output end connects the other end and the collector of triode connects, and connect the other end and probe b with resistance R4 for light emitting diode one end Connection, the emitter of triode are connect with the output end of voltage comparator b, and the cathode of power supply is connect with probe b.

The beneficial effects of the utility model are: power supply is the power supply of entire test pencil using above-mentioned test pencil, close a switch K1, detection circuit work, when the ITO pattern route that need to be detected is without short circuit, lumination of light emitting diode, buzzer is not rung, and is visited Needle is in off state；When the ITO pattern route that need to be detected has short circuit, light emitting diode goes out, and driving buzzer issues the sound, Probe is in short-circuit condition, rapidly and accurately detects whether ITO pattern route has short-circuit generation, operation letter by the test pencil Folk prescription is just, and easy to carry, cheap.

As preferential, the voltage of power supply is 9V, the model L7805CV of three-terminal voltage-stabilizing pipe, the output electricity of three-terminal voltage-stabilizing pipe Pressure is 5V, and using the structure, the voltage of 9V is the power supply of entire test pencil, and L7805CV three-terminal voltage-stabilizing pipe is that output voltage is 4.75- 5.25V, quiescent current are the positive voltage voltage-stablizer of 4.2-8mA.It exports electric current up to 1.5A, is not required to external compensating element, interior Containing current-limiting protection circuit, prevent load short circuits from burning element.

As preferential, 9013 triode of model of triode, 9013 triodes are a kind of NPN type low-power transistors, With Current amplifier effect.

As preferential, the model LM339 of voltage comparator a and voltage comparator b, voltage offsets are small, common mode range It is very big, the internal resistance for comparing signal source is limited very wide.

As preferential, the resistance value of resistance R1, resistance R2 and resistance R3 are 10K Ω, and the resistance value of resistance R4 is 200 The resistance value of Ω, resistance R5 are 1K Ω, and using the structure, the 5V voltage of three-terminal voltage-stabilizing pipe output is divided through R1, R2, to voltage ratio 2.5V voltage is provided compared with the reverse input end of device a and voltage comparator b, the 5V voltage of three-terminal voltage-stabilizing pipe output is through R3 to voltage ratio 5V voltage is provided compared with the noninverting input of device a and voltage comparator b.

Detailed description of the invention

Fig. 1 is the circuit diagram of detection circuit in a kind of portable test pencil of the utility model；

Fig. 2 is a kind of structural schematic diagram of portable test pencil of the utility model；

It is as shown in the figure: 1, three-terminal voltage-stabilizing pipe；2, voltage comparator a；3, voltage comparator b；4, light emitting diode；5, three pole Pipe；6, buzzer；7, shell；8, probe a；9, probe b.

Specific embodiment

Utility model is further described referring to the drawings and in conjunction with specific embodiment, to enable those skilled in the art Refer to the instruction text can be implemented accordingly, and scope of protection of the utility model is not limited to the specific embodiment.

The utility model relates to a kind of for detecting the portable test pencil of ITO pattern route, as shown in Fig. 2, including surveying Electroprobe ontology, the test pencil ontology include a shell 7, the circuit board being mounted in a shell 7 and the probe connecting with circuit board A8 and probe b9, circuit board include detection circuit, as shown in Figure 1, detection circuit include power supply, switch K1, three-terminal voltage-stabilizing pipe 1, Resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, voltage comparator a2, voltage comparator b3, light emitting diode 4, three poles The anode of pipe 5 and buzzer 6, power supply is connect by switch K1 with the input terminal of three-terminal voltage-stabilizing pipe 1, and resistance R1 and resistance R3 are simultaneously Connection, resistance R3 is in parallel with resistance R4, and resistance R4 is in parallel with resistance R5, and the one end resistance R1 is connect with the output end of three-terminal voltage-stabilizing pipe 1 The other end is connected with resistance R2, and the R2 series connection other end is connect with probe b9, and the output end of the one end resistance R3 and three-terminal voltage-stabilizing pipe 1 connects It connects the other end to connect with the non-inverting input terminal of voltage comparator a2, the non-inverting input terminal and voltage comparator b3 of voltage comparator a2 Non-inverting input terminal connect with probe a8, the one end resistance R4 connect the other end and voltage ratio with the output end of three-terminal voltage-stabilizing pipe 1 Output end connection compared with device a2, the one end resistance R5 connect the other end with the output end of three-terminal voltage-stabilizing pipe 1 and the collector of triode 5 connects It connects, 6 one end of buzzer connect the other end with the output end of three-terminal voltage-stabilizing pipe 1 and connect with the collector of triode 5, light emitting diode 4 one end are connect with the resistance R4 series connection other end with probe b9, and the emitter of triode 5 and the output end of voltage comparator b3 connect It connects, the cathode of power supply is connect with probe b9.

As shown in Figure 1, the voltage of power supply is 9V, the model L7805CV of three-terminal voltage-stabilizing pipe 1, the output of three-terminal voltage-stabilizing pipe 1 Voltage is 5V, and the voltage of 9V is the power supply of entire test pencil, and L7805CV three-terminal voltage-stabilizing pipe 1 is that output voltage is 4.75-5.25V, quiet State electric current is the positive voltage voltage-stablizer of 4.2-8mA.It exports electric current up to 1.5A, is not required to external compensating element, includes current limliting guarantor Protection circuit prevents load short circuits from burning element.

As shown in Figure 1,9013 triode of model of triode 5,9013 triodes 5 are a kind of three pole of NPN type small-power Pipe has Current amplifier effect.

As shown in Figure 1, the model LM339 of voltage comparator a2 and voltage comparator b3, voltage offsets are small, common mode model It encloses very greatly, the internal resistance for comparing signal source is limited very wide.

As shown in Figure 1, the resistance value of resistance R1, resistance R2 and resistance R3 are 10K Ω, the resistance value of resistance R4 is The resistance value of 200 Ω, resistance R5 are 1K Ω, and using the structure, the 5V voltage that three-terminal voltage-stabilizing pipe 1 exports is divided through R1, R2, to electricity The reverse input end of comparator a2 and voltage comparator b3 is pressed to provide 2.5V voltage, the 5V voltage that three-terminal voltage-stabilizing pipe 1 exports is through R3 5V voltage is provided to the noninverting input of voltage comparator a2 and voltage comparator b3.

In Fig. 1, the voltage of power supply is 9V, is powered for entire test pencil, close a switch K1, and three-terminal voltage-stabilizing pipe L7805CV is opened Beginning work exports stable 5V voltage, and the third pin of voltage comparator a2 meets 5V, and the 12nd pin connects 0V, three-terminal voltage-stabilizing pipe 1 The 5V voltage of output is divided by resistance R1 and resistance R2, to voltage comparator a2 the 6th pin and voltage comparator b3 the Four pins provide 2.5V voltage, and the 5V voltage that three-terminal voltage-stabilizing pipe 1 exports passes through resistance R3, to the 7th pin of voltage comparator a2 5V voltage is provided with the 5th pin of voltage comparator b3.When the ITO pattern route that need to be detected is without short circuit, probe is in disconnected Line state: the voltage of the 5th pin of the 7th pin and voltage comparator b3 of voltage comparator a2 is 5V, is compared greater than voltage The voltage of 4th pin 2.5V of the 6th pin and voltage comparator b3 of device a2, the first pin and voltage of voltage comparator a2 The second pin of comparator b3 exports high level, and light emitting diode 4 shines after resistance R4 decompression, and triode 5 does not bias Electric current does not work, and buzzer 6 is not rung；When the ITO pattern route that need to be detected has short circuit, probe is in short-circuit condition: voltage ratio The voltage of 5th pin of the 7th pin and voltage comparator b3 compared with device a2 is 0V, the 6th pin less than voltage comparator a2 With the voltage of the 4th pin 2.5V of voltage comparator b3, the second of the first pin of voltage comparator a2 and voltage comparator b3 Pin exports low level, and 4 both end voltage of light emitting diode is 0, and light emitting diode 4 extinguishes, and triode 5 has bias current work, Buzzer 6 is driven to issue the sound.

Above-mentioned test pencil is at low cost, cheap, easy to operate, easy to carry, and high reliablity (is less than 10K short-circuit resistance It can be used).

Claims (5)

1. a kind of for detecting the portable test pencil of ITO pattern route, including test pencil ontology, the test pencil ontology includes Shell (7), the circuit board being mounted in a shell (7) and the probe a (8) and probe b (9) that connect with circuit board, feature exists In: circuit board includes detection circuit, and detection circuit includes power supply, switch K1, three-terminal voltage-stabilizing pipe (1), resistance R1, resistance R2, electricity Hinder R3, resistance R4, resistance R5, voltage comparator a (2), voltage comparator b (3), light emitting diode (4), triode (5) and The anode of buzzer (6), power supply is connect by switch K1 with the input terminal of three-terminal voltage-stabilizing pipe (1), and resistance R1 is in parallel with resistance R3, Resistance R3 is in parallel with resistance R4, and resistance R4 is in parallel with resistance R5, and the one end resistance R1 is connect separately with the output end of three-terminal voltage-stabilizing pipe (1) One end is connected with resistance R2, and the R2 series connection other end is connect with probe b (9), the output end of the one end resistance R3 and three-terminal voltage-stabilizing pipe (1) The connection other end is connect with the non-inverting input terminal of voltage comparator a (2), the non-inverting input terminal and voltage ratio of voltage comparator a (2) Non-inverting input terminal compared with device b (3) is connect with probe a (8), and the one end resistance R4 is connect separately with the output end of three-terminal voltage-stabilizing pipe (1) One end is connect with the output end of voltage comparator a (2), and the one end resistance R5 connect the other end with the output end of three-terminal voltage-stabilizing pipe (1) It is connect with the collector of triode (5), buzzer (6) one end connect the other end and triode with the output end of three-terminal voltage-stabilizing pipe (1) (5) collector connection, light emitting diode (4) one end are connect with the resistance R4 series connection other end with probe b (9), triode (5) Emitter is connect with the output end of voltage comparator b (3), and the cathode of power supply is connect with probe b (9).

2. according to claim 1 a kind of for detecting the portable test pencil of ITO pattern route, it is characterised in that: electricity The voltage in source is 9V, and the model L7805CV of three-terminal voltage-stabilizing pipe (1), the output voltage of three-terminal voltage-stabilizing pipe (1) is 5V.

3. according to claim 1 a kind of for detecting the portable test pencil of ITO pattern route, it is characterised in that: three 9013 triode of model of pole pipe (5).

4. according to claim 1 a kind of for detecting the portable test pencil of ITO pattern route, it is characterised in that: electricity Press the model LM339 of comparator a (2) and voltage comparator b (3).

5. according to claim 1 a kind of for detecting the portable test pencil of ITO pattern route, it is characterised in that: electricity The resistance value of resistance R1, resistance R2 and resistance R3 are 10K Ω, and the resistance value of resistance R4 is 200 Ω, and the resistance value of resistance R5 is 1KΩ。