Photosensitive resistor detection device

Abstract

The utility model relates to the technical field of photoresistor detection, in particular to a photoresistor detection device which comprises a box body with an opening in the front side, a lighting system is arranged at the top in the box body, a drawer type placing block is arranged in the box body, and a plurality of placing holes used for placing photoresistors to be detected are formed in the upper portion of the drawer type placing block. Two contacts are arranged at the bottom of each placing hole, and the two contacts are in contact with the two ends of the photoresistor to be detected respectively; a metal conductive block is arranged on the rear wall of the drawer type placing block, and a groove matched with the metal conductive block is formed in the rear wall in the box body; a circuit board bin is arranged at the bottom in the drawer type placement block, a circuit board is arranged in the circuit board bin, and the circuit board comprises a circuit to be detected, a comparison circuit, a judgment circuit and a processor. According to the utility model, the technical problem of how to improve the efficiency and flexibility of photoresistor sampling detection in a large-scale production environment is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of photoresistor detection, in particular to a photoresistor detection device. Background Art

[0002] Photoresistors are optoelectronic components made of semiconductor materials. Rigorous inspections are crucial during the production process to ensure their quality and performance stability and prevent substandard products from entering the market. However, given the reality of large-scale production, meticulously inspecting every photoresistor is not only time-consuming and labor-intensive, but also significantly increases production costs. Therefore, random sampling inspections offer unique advantages in large-scale photoresistor production. This method significantly reduces the time and resources required for inspection while maintaining certain quality standards. It also allows manufacturers to quickly adjust production parameters based on sampling results, thereby improving overall production efficiency.

[0003] In the existing technology, the traditional sampling detection method of photoresistors generally adopts the method of placing the photoresistors one by one on the test bench for individual testing. This process is not only time-consuming, but also difficult to meet the urgent demand for efficient and batch detection capabilities in large-scale production environments; and traditional detection devices are generally bulky and fixed in position, which to a certain extent limits their detection efficiency and flexibility. Utility Model Content

[0004] The purpose of this application is to provide a photoresistor detection device, which solves the technical problem of how to improve the efficiency and flexibility of photoresistor sampling detection in a large-scale production environment.

[0005] In order to solve the above technical problems, the solution adopted by this application is as follows:

[0006] The utility model provides a photoresistor detection device, characterized in that: it includes a box body with an opening at the front side, a lighting system is provided on the top of the box body, a drawer-type placement block is provided inside the box body, a plurality of placement holes are provided on the upper part of the drawer-type placement block for placing the photoresistor to be detected, and two contacts are provided at the bottom of each placement hole, and the two contacts are respectively in contact with the two ends of the photoresistor to be detected; a circuit board compartment is provided at the bottom of the drawer-type placement block, a circuit board is provided inside the circuit board compartment, and the circuit board includes a circuit to be detected, a comparison circuit, a judgment circuit, and a processor;

[0007] The circuit to be detected includes a plurality of detection circuits connected in parallel, the two contacts of each placement hole serve as two input ends of each detection circuit, and each detection circuit is provided with an output end;

[0008] The comparison circuit includes a plurality of operational amplifiers and a plurality of comparators, wherein the two input terminals of each operational amplifier are respectively connected to the output terminals of two adjacent detection circuits, and the output terminal of each operational amplifier is respectively connected to the positive input terminal of each comparator;

[0009] The judgment circuit includes a plurality of AND gates and two XOR gates, wherein the two input ends of each AND gate are respectively connected to the output ends of two adjacent comparators, and the output end of each AND gate is respectively connected to different pins of the processor;

[0010] The plurality of AND gates include a first AND gate and a last AND gate, an input end of an XOR gate is connected to an input end of the first AND gate, two input ends of the XOR gate are connected to an output end of the first AND gate, and the output end of the XOR gate is connected to a pin of a processor; an input end of two XOR gates is connected to an output end of the last AND gate, two input ends of the two XOR gates are connected to an input end of the last AND gate, and the output ends of the two XOR gates are connected to a pin of a processor.

[0011] In some embodiments, the rear wall of the drawer-type placement block is provided with a metal conductive block, and the rear wall inside the box body is provided with a groove contact matching the metal conductive block. The groove contact is located in the circuit of the lighting system to control the power-on status of the lighting system.

[0012] In some embodiments, it is characterized in that the lighting system includes a working circuit and a controller, and the signal input end of the controller is connected to the signal input end of the working circuit.

[0013] In some embodiments, the lighting system further includes a light driving chip, and the controller controls the working state of the working circuit through the light driving chip.

[0014] In some embodiments, the light driver chip model is FP7126LR-G1.

[0015] In some embodiments, it is characterized in that the working circuit includes a transistor and a plurality of light-emitting diode lamps, and the controller controls the switches of the plurality of light-emitting diode lamps through the transistors.

[0016] In some embodiments, the comparison circuit further includes a potentiometer, and a middle pin of the potentiometer is connected to the negative input terminal of each of the comparators.

[0017] In some embodiments, a handle is provided on the front side of the drawer-type placement block.

[0018] In some embodiments, the processor is a DSP chip, and the model of the DSP chip is TMS320F28335PGFA.

[0019] The technical solution of this application has at least the following advantages and beneficial effects:

[0020] 1. Aiming at the pass rate inspection of large-scale production of photoresistors, the utility model is small in size and adjustable in position, which can be flexibly arranged in the production line or inspection area to meet the needs of different working environments; and the utility model includes a drawer-type porous placement block, which supports batch inspection and is easy to empty after inspection, thereby improving inspection efficiency; the utility model is also equipped with an adjustable brightness lighting system, which is convenient for different light intensity inspections of photoresistors.

[0021] 2. The detection circuit of the present invention is different from the traditional single detection circuit. It adopts a mutual detection method between adjacent photoresistors. Once the measurement value between adjacent resistors exceeds the preset error threshold, the unqualified photoresistor can be located, thereby improving the accuracy and efficiency of detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0023] Figure 2 It is a cross-sectional view of the utility model;

[0024] Figure 3 1 is a circuit diagram of three photoresistors to be detected in this embodiment;

[0025] Figure 4 is a working circuit diagram of the lighting system in this embodiment;

[0026] Figure 5 This is the working circuit diagram of the comparator.

[0027] In the figure: 1- drawer-type placement block, 2- box body, 3- handle, 4- lighting system, 5- circuit board compartment, 6- metal conductive block, 7- groove contact, 8- contact, 9- placement hole. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0029] It should be noted that similar reference numerals and letters denote similar items in the following figures. Therefore, once an item is defined in one figure, it does not require further definition or explanation in subsequent figures. Terms such as "center," "upper," "lower," "inner," and "outer" indicate positions or locations based on the positions or locations shown in the figures, or the positions or locations in which the product is typically placed when in use. These terms are used solely for ease of description and simplification of the present application. They do not indicate or imply that the device or component referred to must have a specific position, be constructed, or operate in a specific orientation, and are not to be construed as limiting the present application. It should also be noted that, unless otherwise expressly specified or limited, the terms "disposed," "mounted," and "connected" should be interpreted broadly. For example, they can refer to fixed, removable, or integral connections; mechanical or electrical connections; direct connections or indirect connections through an intermediary; or internal connections between two components. Those skilled in the art will understand the specific meanings of these terms in this application in specific contexts.

[0030] Example 1

[0031] Please refer to Figures 1-4 The utility model provides a photoresistor detection device, including a box body 2 with an opening on the front side, and a lighting system 4 is arranged on the top of the box body 2. After the lighting system 4 is powered, it will adjust the brightness according to the set value to simulate different brightness scenes; a drawer-type placement block 1 is provided inside the box body 2, and a plurality of placement holes 9 are provided on the upper part of the drawer-type placement block 1 for placing the photoresistors to be detected, and two contacts 8 are provided at the bottom of each placement hole 9, and the two contacts 8 are respectively in contact with the two ends of the photoresistor to be detected; a circuit board compartment 5 is provided at the bottom of the drawer-type placement block 1, and a circuit board is arranged inside the circuit board compartment 5. The circuit board includes a circuit to be detected, a comparison circuit, a judgment circuit, and a processor; when the two ends of the photoresistor to be detected are respectively in contact with the two contacts 8, the photoresistor to be detected is connected to the circuit to be detected.

[0032] A handle 3 is provided on the front side of the drawer-type placement block 1. The staff uses the handle 3 to pull the drawer-type placement block 1 out of the box body 2 to place the photoresistor to be tested; after the photoresistor testing is completed, the staff pulls out the drawer-type placement block 1 again, picks out the unqualified photoresistors, and pours the remaining qualified photoresistors from the drawer-type placement block 1 into the product pool. This design facilitates the rapid emptying of the drawer-type placement block 1, thereby improving the detection efficiency.

[0033] A metal conductive block 6 is provided on the rear wall of the drawer-type placement block 1, and a groove contact 7 matching the metal conductive block 6 is provided on the inner rear wall of the box body 2. The groove contact 7 is located in the circuit of the lighting system and serves as a switch of the lighting system; when the groove contact 7 contacts the metal conductive block 6, the lighting system 4 is in a power-on state.

[0034] The utility model has a small size and its position can be adjusted according to actual needs, which makes it easy to flexibly arrange it in the production line or detection area to meet different work needs and scene applications, greatly improving the convenience and flexibility of use.

[0035] The circuit to be detected includes several parallel detection circuits, the two contacts 8 of each placement hole 9 serve as the two input ends of each detection circuit, and each detection circuit is respectively provided with an output end; the circuit to be detected is mainly used to provide the circuit environment required for the photoresistor to be detected to drive the photoresistor to work normally.

[0036] The comparison circuit includes several operational amplifiers and several comparators. The two input terminals of each operational amplifier are respectively connected to the output terminals of two adjacent detection circuits, and the output terminal of each operational amplifier is respectively connected to the positive input terminal of each comparator. The operational amplifier in the comparison circuit is mainly used to amplify the difference between adjacent photoresistors to be detected, and the comparator is used to compare whether the difference exceeds the error range. If the difference exceeds the error range, it means that one of the two adjacent resistors is an unqualified photoresistor.

[0037] The comparison circuit further includes a potentiometer, wherein the middle pin of the potentiometer is connected to the negative input terminal of each comparator. The potentiometer is used to set the error threshold.

[0038] The judgment circuit includes a plurality of AND gates and two XOR gates. The two input ends of each AND gate are respectively connected to the output ends of two adjacent comparators, and the output end of each AND gate is respectively connected to different pins of the processor.

[0039] The plurality of AND gates include a first AND gate and a last AND gate, an input end of an XOR gate is connected to an input end of the first AND gate, two input ends of an XOR gate are connected to an output end of the first AND gate, and an output end of the XOR gate is connected to a pin of a processor; one input end of two XOR gates is connected to an output end of the last AND gate, two input ends of two XOR gates are connected to an input end of the last AND gate, and the output ends of the two XOR gates are connected to a pin of the processor; the function of the judgment circuit is to further determine the unqualified photoresistor among the two adjacent resistors.

[0040] To facilitate understanding of the overall circuit on the circuit board, three photoresistors to be tested are taken as an example. The following describes the circuit connection relationship and circuit workflow.

[0041] like Figure 3As shown, the circuit of the three photoresistors to be detected includes the photoresistors U1, U2, and U3 to be detected, operational amplifiers U4 and U5, comparators U6 and U7, AND gate U9, XOR gates U8 and U10, resistors R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, and R11, capacitors C1 and C2, and potentiometer PR1;

[0042] It should be noted that the function of capacitor C1 and capacitor C2 is filtering; the circuit to be detected includes the photoresistors U1, U2, U3 to be detected, and resistors R6, R7, R8; the comparison circuit includes operational amplifiers U4, U5, comparators U6, U7, resistors R1, R2, R3, R4, R5, R9, R10, R11, capacitors C1, C2, and potentiometer PR1; the judgment circuit includes AND gate U9 and XOR gates U8, U10.

[0043] Specifically, one end of the resistor R6, one end of the resistor R7, and one end of the circuit R8 are connected and connected to the power supply, the other end of the resistor R8, one end of the photoresistor U1 to be detected, and one end of the resistor R1 are connected, the other end of the resistor R7, one end of the photoresistor U2 to be detected, and one end of the resistor R2 are connected, the other end of the resistor R6, one end of the photoresistor U3 to be detected, and one end of the resistor R3 are connected; the other end of the photoresistor U1 to be detected, the other end of the photoresistor U2 to be detected, and the other end of the photoresistor U3 to be detected are connected and connected Ground; the other end of resistor R1, pin 4 of operational amplifier U5, and one end of resistor R4 are connected, pin 2 of operational amplifier U5 is connected to power supply, pin 5 is grounded, pin 1 of operational amplifier U5, the other end of resistor R4, and one end of resistor R9 are connected, pin 3 of operational amplifier U5, the other end of resistor R2, pin 4 of operational amplifier U4, and one end of resistor R5; pin 3 of operational amplifier U4 is connected to the other end of resistor R3; pin 2 of operational amplifier U4 is connected to power supply, pin 5 is grounded, operational amplifier U Pin 1 of comparator U4, the other end of resistor R5, and one end of resistor R10 are connected; the other end of resistor R9, one end of capacitor C2, and pin 3 of comparator U7 are connected, the other end of capacitor C2 is grounded, pin 2 of comparator U7 is connected to power supply, and pin 5 is grounded; the other end of resistor R10, one end of capacitor C1, and pin 3 of comparator U6 are connected, and the other end of capacitor C1 is grounded; pin 2 of comparator U6 is connected to power supply, and pin 5 is grounded; pin 4 of comparator U6, pin 4 of comparator U7, and the middle pin of potentiometer PR1 are connected. Connect, one end of the potentiometer PR1 is grounded and the other end is connected to the power supply; pin 1 of the comparator U7, the A end of the AND gate U9, and the pin 1 of the XOR gate U10 are connected, pin 1 of the comparator U6, the B end of the AND gate U9, and the pin 2 of the XOR gate U9 are connected, and the Y end of the AND gate U9, the pin 2 of the XOR gate U10, and the pin 1 of the XOR gate U8 are connected, and the output end is set here, which is the OUT2 output end; pin 3 of the XOR gate U10 is set to the OUT1 output end, and pin 3 of the XOR gate U8 is set to the OUT3 output end.

[0044] Specifically, the working process of the circuit of the three photoresistors to be detected is:

[0045] The photoresistor U1 to be detected outputs a voltage signal to pin 4 of the operational amplifier U5, the photoresistor U2 to be detected outputs a voltage signal to pin 3 of the operational amplifier U5 and pin 4 of the operational amplifier U4 respectively, and the photoresistor U3 to be detected outputs a voltage signal to pin 3 of the operational amplifier U4;

[0046] The operational amplifier U5 calculates the voltage difference between the adjacent photoresistors to be detected U1 and U2, and outputs it to the comparator U7 for comparison. The operational amplifier U4 calculates the voltage difference between the adjacent photoresistors to be detected U2 and U3, and outputs it to the comparator U6 for comparison.

[0047] Potentiometer PR1 provides a voltage threshold to comparator U6 and comparator U7. Comparator U6 and comparator U7 respectively compare the received voltage difference with the voltage threshold. If the voltage difference is greater than the voltage threshold, it indicates that there is an unqualified resistor and the comparator outputs a high level. If the voltage difference is less than the voltage threshold, it indicates that there is no unqualified resistor and the comparator outputs a low level.

[0048] The judgment circuit judges the output signals of the comparator U6 and the comparator U7;

[0049] If the comparator U7 outputs a high level and the comparator U6 outputs a low level, it means that the difference between the photoresistor U1 to be tested and the photoresistor U2 to be tested is large, and the difference between the photoresistor U2 to be tested and the photoresistor U3 to be tested is within the error range. The judgment circuit determines that the photoresistor U1 to be tested is an unqualified resistor, and the OUT1 output terminal outputs a signal to the processor;

[0050] If the comparator U7 outputs a low level and the comparator U6 outputs a high level, it means that the difference between the photoresistor U1 to be tested and the photoresistor U2 to be tested is within the error range, and the difference between the photoresistor U2 to be tested and the photoresistor U3 to be tested is larger, the judgment circuit determines that the photoresistor U3 to be tested is an unqualified resistor, and the output terminal OUT3 outputs a signal to the processor;

[0051] If the comparator U7 outputs a high level and the comparator U6 outputs a high level, it means that the difference between the photoresistor U1 to be tested and the photoresistor U2 to be tested is large, and the difference between the photoresistor U2 to be tested and the photoresistor U3 to be tested is also large. The judgment circuit determines that the photoresistor U2 to be tested is an unqualified resistor, and the output terminal OUT2 outputs a signal to the processor;

[0052] If the comparator U7 outputs a low level and the comparator U6 outputs a low level, it means that the difference between the photoresistor U1 to be tested and the photoresistor U2 to be tested is within the error range, and the difference between the photoresistor U2 to be tested and the photoresistor U3 to be tested is also within the error range. The judgment circuit determines that the three resistors to be tested are all qualified resistors;

[0053] The processor processes the received data and transmits it to the monitoring end.

[0054] In the above three examples of circuits for detecting photoresistors, multiple detection circuits are added in parallel to the circuit to be detected. At the same time, an operational amplifier and a comparator are set for each two adjacent detection circuits, and the output end of the comparator is simultaneously connected to one input end of two adjacent AND gates, thus forming the overall circuit of the circuit board in the utility model.

[0055] It needs to be explained that, Figure 5 As shown, except for the first and last two comparators, the other comparators are connected to one input terminal of two adjacent AND gates.

[0056] It should be noted that the processor in the circuit board is a DSP chip, and the model of the DSP chip is TMS320F28335PGFA.

[0057] It should be explained that by comparing adjacent photoresistors to be tested, subtle performance differences can be captured more effectively, which may be difficult to detect when tested and compared individually. This method improves the accuracy of detection; and the pairwise mutual detection mechanism reduces the possibility of misjudgment caused by abnormalities in a single measurement point, because unqualified photoresistors will be verified multiple times in comparison with their adjacent resistors, increasing the reliability of the judgment.

[0058] The lighting system 4 includes a working circuit and a controller, wherein a signal input terminal of the controller is connected to a signal input terminal of the working circuit; the working circuit includes a transistor and a plurality of light-emitting diode lamps, and the controller controls the switches of the plurality of light-emitting diode lamps through the transistors.

[0059] Furthermore, if Figure 4 As shown, the working circuit of the lighting system 4 in this embodiment includes transistors Q1 and Q2, resistors R11 and R12, light-emitting diodes LED1, LED2, LED3, LED4, LED5, LED6, and a switch SW1;

[0060] It should be explained that the switch SW1 represents the contact state between the metal conductive block 6 and the groove contact 7. When the metal conductive block 6 is in contact with the groove contact 7, the switch SW1 is connected; when the metal conductive block 6 is not in contact with the groove contact 7, the switch SW1 is disconnected.

[0061] Specifically, one end of the resistor R11 is set as a signal input end, and the signal input end is connected to the signal output end of the controller; the other end of the resistor R11 is connected to the base of the transistor Q1, the emitter of the transistor Q1 is grounded, the collector of the transistor Q1, one end of the resistor R12, and pin 2 of the switch SW1 are connected, and pin 1 of the switch SW1 is connected to the collector of the transistor Q2 and connected to the power supply; the other end of the resistor R12 is connected to the base of the transistor Q2, the emitter of the transistor Q2, the positive pole of the light-emitting diode lamp LED1, the positive pole of the light-emitting diode lamp LED2, the positive pole of the light-emitting diode lamp LED3, the positive pole of the light-emitting diode lamp LED4, the positive pole of the light-emitting diode lamp LED5, and the positive pole of the light-emitting diode lamp LED6 are connected; the cathode of the light-emitting diode lamp LED1, the cathode of the light-emitting diode lamp LED2, the cathode of the light-emitting diode lamp LED3, the cathode of the light-emitting diode lamp LED4, the cathode of the light-emitting diode lamp LED5, and the negative pole of the light-emitting diode lamp LED6 are connected and grounded.

[0062] It should be noted that the controller transmits a PWM signal to the working circuit, and all the LED lights in the working circuit light up; the controller changes the brightness of the LED lights in the working circuit by changing the duty cycle of the PWM signal.

[0063] In this embodiment, the lighting system 4 also includes a light driver chip. The main function of the light driver chip is to convert the PWM signal into a stable DC signal. The controller stably controls the working state of the working circuit through the light driver chip; the light driver chip model is FP7126LR-G1.

[0064] Thus far, various embodiments of the present invention have been described in detail. To avoid obscuring the concept of the present invention, some details known in the art have been omitted. Based on the above description, those skilled in the art will fully understand how to implement the technical solutions of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A photoresistor detection device, characterized in that: The invention comprises a box body (2) with a front opening, a lighting system (4) being provided at the top of the box body (2), a drawer-type placement block (1) being provided inside the box body (2), a plurality of placement holes (9) being provided on the top of the drawer-type placement block (1) for placing a photoresistor to be detected, two contacts (8) being provided at the bottom of each placement hole (9), the two contacts (8) respectively contacting the two ends of the photoresistor to be detected; a circuit board compartment (5) being provided at the bottom of the drawer-type placement block (1), a circuit board being provided inside the circuit board compartment (5), the circuit board comprising a circuit to be detected, a comparison circuit, a judgment circuit, and a processor; The circuit to be detected includes a plurality of detection circuits connected in parallel, the two contacts (8) of each placement hole (9) serve as two input ends of each detection circuit, and each detection circuit is provided with an output end; The comparison circuit includes a plurality of operational amplifiers and a plurality of comparators, wherein the two input terminals of each operational amplifier are respectively connected to the output terminals of two adjacent detection circuits, and the output terminal of each operational amplifier is respectively connected to the positive input terminal of each comparator; The judgment circuit includes a plurality of AND gates and two XOR gates, wherein the two input ends of each AND gate are respectively connected to the output ends of two adjacent comparators, and the output end of each AND gate is respectively connected to different pins of the processor; The plurality of AND gates include a first AND gate and a last AND gate, an input end of an XOR gate is connected to an input end of the first AND gate, two input ends of an XOR gate are connected to an output end of the first AND gate, and the output end of the XOR gate is connected to a pin of a processor; an input end of two XOR gates is connected to an output end of the last AND gate, two input ends of two XOR gates are connected to an input end of the last AND gate, and the output ends of two XOR gates are connected to a pin of a processor.

2. A photoresistor detection device according to claim 1, characterized in that: The rear wall of the drawer-type placement block (1) is provided with a metal conductive block (6), and the inner rear wall of the box body (2) is provided with a groove contact (7) matching the metal conductive block (6). The groove contact (7) is located in the circuit of the lighting system (4) and controls the power-on state of the lighting system (4).

3. A photoresistor detection device according to any one of claims 1 and 2, characterized in that: The lighting system (4) comprises a working circuit and a controller, wherein a signal input end of the controller is connected to a signal input end of the working circuit.

4. A photoresistor detection device according to claim 3, characterized in that: The lighting system (4) further comprises a light driving chip, and the controller controls the working state of the working circuit via the light driving chip.

5. A photoresistor detection device according to claim 4, characterized in that: The light driver chip model is FP7126LR-G1.

6. A photoresistor detection device according to any one of claims 3 and 4, characterized in that: The working circuit includes a triode and a plurality of light emitting diode lamps, and the controller controls the switches of the plurality of light emitting diode lamps through the triode.

7. A photoresistor detection device according to claim 1, characterized in that: The comparison circuit further includes a potentiometer, wherein a middle pin of the potentiometer is connected to a negative input terminal of each comparator.

8. A photoresistor detection device according to claim 1, characterized in that: A handle (3) is provided on the front side of the drawer-type placement block (1).

9. A photoresistor detection device according to claim 1, characterized in that: The processor is a DSP chip, and the model of the DSP chip is TMS320F28335PGFA.

Images