A resistance matching device for laser diode

Abstract

The present invention discloses a resistance matching device for a laser diode, comprising a frame, a programmable variable resistor, an optical power measuring mechanism, a resistor feeding mechanism, a resistor grabbing mechanism, and a control circuit. The frame includes a platform, and the control circuit includes a controller. After the laser diode and the programmable variable resistor are connected in series and energized, the controller stepwise changes the resistance value of the programmable variable resistor according to a set program. The optical power measuring mechanism measures the power of the laser diode and feeds back the power value of the laser diode's light to the controller. When the power value of the laser diode's light reaches a set value, the resistance value of the programmable variable resistor becomes the selected resistance value. The controller controls the resistor grabbing mechanism to grab a resistor corresponding to the selected resistance value from the resistor feeding mechanism and deliver it to a designated location. The resistor matching device of the present invention automatically performs the task of matching resistors, resulting in high matching efficiency and good matching quality.

Description

[Technical field]

[0001] The invention relates to laser diode adjustment equipment, in particular to a resistance matching device for a laser diode. [Background Technology]

[0002] Laser diodes offer advantages such as small size, light weight, low power consumption, simple drive circuits, easy modulation, and resistance to mechanical shock and vibration. However, they are extremely sensitive to overcurrent, overvoltage, and electrostatic interference. Therefore, during use, special care must be taken to ensure that their operating parameters do not exceed their maximum allowable values. Therefore, before assembly, the laser diode's luminous power must be adjusted to prolong its life and save energy. This adjustment involves connecting a current-limiting resistor in series with the laser diode circuit. Because the laser diode's initial luminous intensity varies greatly, it must be adjusted to the appropriate luminous power. Consequently, the resistance values ​​of the resistors required vary greatly, requiring a large number of spare resistors. These resistors must be selected based on the laser diode's luminous intensity, making resistor selection a laborious process. Traditionally, resistor selection for laser diodes has been performed manually, which is time-consuming, labor-intensive, inefficient, and prone to human error. [Summary of the invention]

[0003] The technical problem to be solved by the present invention is to provide a resistance matching device for a laser diode with high matching efficiency and good matching quality.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is a resistance matching device for a laser diode, including a frame, a programmable variable resistor, an optical power measuring mechanism, a resistor feeding mechanism, a resistor grabbing mechanism and a control circuit, the frame including a table, and the control circuit including a controller; the laser diode and the programmable variable resistor are connected in series and energized, the controller stepwise changes the resistance value of the programmable variable resistor according to a set program, the optical power measuring mechanism measures the power of the laser diode and feeds back the power value of the laser diode light to the controller; when the power value of the laser diode light reaches the set value, the resistance value of the programmable variable resistor is the matching resistance value; the controller controls the resistor grabbing mechanism to grab the resistor corresponding to the matching resistance value from the resistor feeding mechanism and send it to the specified position.

[0005] The resistance matching device described above, the optical power measurement mechanism includes an optical power meter, a photosensor, a through-beam photoelectric sensor and a detection seat, a laser diode, a photosensor and a through-beam photoelectric sensor are installed in the detection seat, and when the through-beam photoelectric sensor senses that the laser diode is installed in place, it sends a signal to the controller; the photosensor converts the luminous intensity of the laser diode into an electrical signal, and inputs it into the optical power meter, and the optical power meter converts the electrical signal sent by the photosensor into a power value signal and transmits it to the controller.

[0006] The resistance matching device described above comprises a test base, a cover, and a clamping cylinder. The cover is fixed to the top of the base; the cover includes a through-hole orthogonal to the main surface of the cover. The clamping cylinder is fixed to the top surface of the cover, with the piston rod facing the through-hole. A movable pressure block is mounted on the piston rod; the through-hole is located on the side away from the clamping cylinder. A V-shaped block is mounted on the top surface of the cover. The base has a mounting hole for the photosensor, which is connected to the through-hole. A through-beam photoelectric sensor is mounted in a groove in the cover, with the optical path of the through-beam photoelectric sensor orthogonal to the through-hole. The control terminal of the clamping cylinder's drive module is connected to the controller.

[0007] The resistance matching device described above, the detection seat includes a base and two angle adjustment plates, the base is fixed on the table, and includes two vertical plates, and the two angle adjustment plates are respectively fixed on the inner sides of the two vertical plates; the angle adjustment plate includes a hinge hole and an arc hole, and the arc line of the arc hole takes the axis of the hinge hole as the center of the circle; the two sides of the base plate each include a hinge axis and a threaded hole, and the hinge axis of the base plate passes through the hinge hole of the corresponding angle adjustment plate; the base plate fixing screw passes through the arc hole and is screwed into the threaded hole on the side of the base plate.

[0008] The resistor matching device described above, the resistor grasping mechanism includes an X-axis motion mechanism, a Z-axis motion mechanism and a vacuum suction mechanism. The X-axis motion mechanism includes a linear slide driven by a servo motor, and the linear slide is fixed above the table through a support and arranged along the X-axis direction; the Z-axis motion mechanism includes a mounting seat, a linear guide pair, a stepper motor and a toothed belt mechanism driven by the stepper motor, and the mounting seat of the Z-axis motion mechanism is fixed on the slider of the linear slide; the guide rail of the linear guide pair is vertically fixed on the mounting seat, and the slider of the linear guide pair is connected to the belt clamp on the toothed belt of the toothed belt mechanism; the vacuum suction mechanism includes a vacuum pipe, a vacuum nozzle, a vacuum sensor and a vacuum air source controlled by a controller; the vacuum pipe is fixed on the slider of the linear guide pair, and the upper end is connected to the vacuum air source; the vacuum nozzle is installed at the lower end of the vacuum pipe, and the vacuum sensor is connected to the vacuum pipe; the control end of the servo motor, the control end of the stepper motor and the signal output end of the vacuum sensor are respectively connected to the controller.

[0009] The resistance matching device described above includes a blanking mechanism, which includes a chute and a support frame. The chute is fixed to the table through the support frame and is arranged below one end of the X-axis motion mechanism. The table includes a blanking hole, and the outlet of the lower end of the chute faces the blanking hole.

[0010] The resistor matching device described above includes a resistor feeding mechanism including a feeder base and a number of resistor feeders corresponding to the required resistance values; the feeder base is fixed on the table, and the bottom of the resistor feeder is fixed on the feeder mounting seat corresponding to the feeder base; the discharge ports of all resistor feeders are arranged along the X-axis direction.

[0011] The resistance matching device described above, the programmable variable resistor includes multiple controllable resistance units and two wiring ports, the controllable resistance unit includes a resistor and a relay, the relay contacts of the controllable resistance unit are connected in parallel with the resistor; the resistors of all the controllable resistance units are connected in series between the two wiring ports; the control terminal of the controllable resistance unit relay is connected to the controller.

[0012] The resistance matching device described above includes the following steps when it works:

[0013] 901) The operator connects the laser diode to be matched with the resistor in series with the programmable variable resistor and turns on the power supply;

[0014] 902) The operator inserts the laser diode into the through hole of the detection seat. When the through-beam photoelectric sensor senses that the laser diode is installed in place, it sends a signal to the controller;

[0015] 903) the controller drives the clamping cylinder to clamp the laser diode;

[0016] 904) The controller reduces the resistance of the programmable variable resistor step by step according to the set program, and the power of the laser diode light is increased step by step;

[0017] 905) The electrical signal output by the photosensor increases with the power of the laser diode. The optical power meter converts the electrical signal output by the photosensor into the power value of the laser diode and transmits it to the controller.

[0018] 906) When the power value of the laser diode reaches the set value, the resistance value of the programmable variable resistor is the selected resistance value;

[0019] 907) The controller drives the X-axis motion mechanism according to the selected resistance value, and moves the vacuum nozzle on the Z-axis motion mechanism along the X direction to above the resistor corresponding to the selected resistance value of the resistor feeding mechanism;

[0020] 908) The stepper motor drives the suction nozzle downward to the resistor to be sucked, the controller turns on the vacuum air source, and after the suction nozzle sucks the selected resistor, the stepper motor drives the suction nozzle upward to leave the resistor feeding mechanism;

[0021] 909) The X-axis motion mechanism moves the suction nozzle of the Z-axis motion mechanism and the adsorbed resistor to a specified position along the X direction. The Z-axis motion mechanism moves downward, the vacuum pipe breaks the vacuum, and the vacuum nozzle releases the optional resistor.

[0022] In the resistance matching device described above, the programmable variable resistor includes multiple controllable resistance units and two wiring ports, the controllable resistance unit includes a resistor and a relay, and the relay contacts of the controllable resistance unit are connected in parallel with the resistor; the resistors of all the controllable resistance units are connected in series between the two wiring ports; the control terminal of the controllable resistance unit relay is connected to the controller; in step 904, the initial resistance value of the programmable variable resistor is greater than or equal to the resistance value of the maximum resistance supplied by the resistor feeding mechanism, and the controller closes the contacts of the controllable resistance unit relay one at a time to stepwise reduce the resistance value of the programmable variable resistor.

[0023] The resistor matching work of the present invention is automatically completed by the resistor matching device, and the matching efficiency is high and the matching quality is good. [Brief Description of the Drawings]

[0024] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0025] Figure 1 It is a three-dimensional diagram of a resistance matching device according to an embodiment of the present invention.

[0026] Figure 2 It is a three-dimensional diagram from another perspective of the resistance matching device according to an embodiment of the present invention.

[0027] Figure 3 It is a front view of the main body of the resistance matching device according to an embodiment of the present invention.

[0028] Figure 4 It is a top view of the main body of the resistance matching device according to an embodiment of the present invention.

[0029] Figure 5 It is a three-dimensional diagram of the main body of the resistance matching device according to an embodiment of the present invention.

[0030] Figure 6 It is a three-dimensional diagram of the main body of the resistance matching device according to an embodiment of the present invention from another perspective.

[0031] Figure 7 It is a front view of the optical power measurement mechanism according to an embodiment of the present invention.

[0032] Figure 8 yes Figure 7 AA section view in.

[0033] Figure 9 It is a three-dimensional diagram of the main body of the optical power measurement mechanism according to an embodiment of the present invention.

[0034] Figure 10 This is a three-dimensional diagram of the optical power measurement mechanism with the cover removed according to an embodiment of the present invention.

[0035] Figure 11 It is a three-dimensional diagram of the resistor grabbing mechanism according to an embodiment of the present invention.

[0036] Figure 12 It is a three-dimensional diagram of the Z-axis motion mechanism and the vacuum suction mechanism of an embodiment of the present invention.

[0037] Figure 13 It is a three-dimensional diagram of the resistor feeding mechanism according to an embodiment of the present invention.

[0038] Figure 14 It is a three-dimensional diagram of the blanking mechanism according to an embodiment of the present invention.

[0039] Figure 15 1 is a circuit diagram of a programmable variable resistor according to an embodiment of the present invention. [Specific implementation method]

[0040] The structure and principle of the resistance matching device of the laser diode in the embodiment of the present invention are as follows: Figures 1 to 15 As shown, the system includes a cabinet frame 10 serving as a rack, a programmable variable resistor, an optical power measurement mechanism 20, a resistor feeding mechanism 30, a resistor grabbing mechanism 40, a material unloading mechanism 50, and a control circuit. A platform 11 is located in the center of the cabinet frame 10. The control circuit utilizes a servo control system and includes a controller 61 and a display 62.

[0041] When the resistance matching device of the present invention is in operation, a laser diode and a programmable variable resistor are connected in series and energized. A controller gradually changes the resistance of the programmable variable resistor according to a pre-set program. The optical power measurement mechanism 20 measures the laser diode's power and provides feedback to the controller. When the laser diode's power reaches the set value, the programmable variable resistor's resistance value becomes the selected resistance value. The controller then controls the resistor grabbing mechanism 40 to grab a resistor corresponding to the selected resistance value from the resistor feeding mechanism 30 and deliver it to the unloading mechanism 50.

[0042] The optical power measurement mechanism 20 includes an optical power meter (not shown), a photosensor 21, a through-beam photoelectric sensor 22, and a detection base 20A. The laser diode 01, the photosensor 21, and the through-beam photoelectric sensor 22 are mounted in the detection base 20A. When the through-beam photoelectric sensor 22 detects that the laser diode 01 is properly installed, it sends a signal to the controller. The photosensor 21 converts the luminous intensity of the laser diode into an electrical signal, which is input into the optical power meter. The optical power meter converts the electrical signal from the photosensor 21 into a power value signal and transmits it to the controller.

[0043] The detection seat 20A includes a base plate 23, a cover plate 24, a clamping cylinder 25, a base 26 and two angle adjustment plates 27. The cover plate 24 is fixed on the top of the base plate 23. There is a through hole 241 on the cover plate 24 that is orthogonal to the main plane of the cover plate 24. The clamping cylinder 25 is fixed on the top surface of the cover plate 24, and the piston rod faces the through hole 241. A movable pressure block 251 is installed on the piston rod. The through hole 241 is away from the side of the clamping cylinder. A V-shaped block 252 is installed on the top surface of the cover plate 24. There is a mounting hole 231 for the photosensor 21 on the base plate 23, and the mounting hole of the photosensor 21 is connected to the through hole 241. The through-type photoelectric sensor 22 is installed in the groove of the cover plate 24, and the optical path of the through-type photoelectric sensor 22 is orthogonal to the through hole 241. The control terminal of the clamping cylinder drive module is connected to the controller.

[0044] The base 26 is fixed to the table 11, and there are two vertical plates 261 on the base 26. Two angle adjustment plates 27 are respectively fixed on the inner sides of the two vertical plates 261. The angle adjustment plate 27 includes a hinge hole 271 and an arc hole 272. The arc of the arc hole 272 is centered on the axis of the hinge hole 271. There is a hinge shaft 232 and a threaded hole 233 on each side of the bottom plate 23. The hinge shaft 232 of the bottom plate 23 passes through the hinge hole 271 of the corresponding angle adjustment plate 27 to realize the hinge connection between the bottom plate 23 and the base 26. The bottom plate fixing screw 273 passes through the arc hole 272 and is screwed into the threaded hole 233 on the side of the bottom plate 23 to fix the bottom plate 23 with the adjusted angle.

[0045] The resistor grabbing mechanism 40 includes an X-axis motion mechanism 40A, a Z-axis motion mechanism 40B and a vacuum suction mechanism 40C. The X-axis motion mechanism 40A includes a linear slide 41 driven by a servo motor 411. The linear slide 41 is fixed above the table 11 through a support 412 and is arranged along the X-axis direction. The Z-axis motion mechanism 40B includes a mounting seat 42, a linear guide pair 43, a stepping motor 441 and a toothed belt mechanism 44 driven by the stepping motor 441. The mounting seat 42 of the Z-axis motion mechanism 40B is fixed on the slider 413 of the linear slide 41. The guide rail 431 of the linear guide pair 43 is vertically fixed on the mounting seat 42, and the slider 432 of the linear guide pair 43 is connected to the belt clamp 442 on the toothed belt of the toothed belt mechanism 44. The vacuum suction mechanism 40C includes a vacuum pipe 45, a vacuum nozzle 46, a vacuum sensor and a vacuum air source controlled by a controller (not shown in the figure). A vacuum pipe 45 is secured to the slider 432 of the linear guide assembly 43 via a fixing block 451. Its upper end is connected to a vacuum source. A vacuum nozzle 46 is mounted at the lower end of the pipe 45, and a vacuum sensor is connected to the pipe 45. The control terminal of the servo motor 411, the control terminal of the stepper motor 441, and the signal output terminal of the vacuum sensor are each connected to a controller.

[0046] The unloading mechanism 50 includes a tubular chute 51 and a support frame 52. The chute 51 is fixed obliquely on the table 11 through the support frame 52 and is arranged below the end of the X-axis motion mechanism 40A. There is a feed port 511 at the upper part of the chute 51, and a blanking hole 111 is provided on the table 11. The outlet at the lower end of the chute 51 faces the blanking hole 111.

[0047] The resistor feeder mechanism 30 includes a feeder base 32 and a number of resistor feeders (feeders) 31 corresponding to the desired resistor values. The feeder base 32 is fixed to the table 11, and the bottom of the resistor feeder 31 is fixed to a corresponding feeder mounting seat 321. The feeder outlets of all resistor feeders are aligned at the same height, aligned along the X-axis, and parallel to the guide rails of the linear slide 41.

[0048] The programmable variable resistor consists of 12 resistors R1 to R12, 12 relays K1 to K12, and two wiring terminals V+ and V-. Each resistor and relay form a controllable resistor unit. The relay contacts of the controllable resistor unit are connected in parallel with the resistor. All resistors R1 to R12 of the controllable resistor unit are connected in series between the two wiring terminals V+ and V-. The control terminals of the 12 relays K1 to K12 are connected to a controller.

[0049] The resistance matching device for a laser diode according to an embodiment of the present invention comprises the following steps when in operation:

[0050] 1) The operator connects the laser diode 01 to be matched with the resistor in series with the programmable variable resistor and turns on the power.

[0051] 2) The operator inserts the laser diode 01 into the through hole 241 of the detection seat 20A. When the through-beam photoelectric sensor 22 senses that the laser diode is installed in place, it sends a signal to the controller.

[0052] 3) The controller drives the clamping cylinder 25 to clamp the laser diode.

[0053] 4) The initial resistance value of the programmable variable resistor is greater than or equal to the resistance value of the maximum resistor supplied by the resistor feeding mechanism 30. The controller closes the contacts of a controllable resistor unit relay each time, step by step reducing the resistance value of the programmable variable resistor, and the power of the laser diode light is step by step increased.

[0054] 5) The electrical signal output by the photosensor 21 increases step by step as the power of the laser diode light emission decreases along with the resistance value of the programmable variable resistor. The optical power meter converts the electrical signal output by the photosensor 21 into the power value of the laser diode light emission and transmits it to the controller.

[0055] 6) When the power value of the laser diode light reaches the set value, the controller determines the resistance value of the programmable variable resistor as the selected resistance value.

[0056] 7) The controller drives the X-axis motion mechanism 40A according to the selected resistance value, and moves the vacuum suction nozzle 46 on the Z-axis motion mechanism 40B along the X direction to above the outlet of the specific resistor feeder 31 of the resistor feeding mechanism 30, that is, above the selected resistor corresponding to the selected resistance value.

[0057] 8) The stepper motor 441 drives the suction nozzle 46 downward to the resistor to be sucked, and the controller turns on the vacuum air source. After the suction nozzle 46 sucks the selected resistor, the stepper motor 441 drives the suction nozzle 46 upward to leave the resistor feeding mechanism 30.

[0058] 9) The X-axis motion mechanism 40A moves the suction nozzle 46 of the Z-axis motion mechanism 40B and the adsorbed resistor along the X direction to above the feed port 511 of the tubular chute 51 of the unloading mechanism 50. The Z-axis motion mechanism 40B moves downward, the vacuum suction pipe 45 breaks the vacuum, and the vacuum suction nozzle 46 releases the selected resistor. The resistor falls into the feed port 511 of the tubular chute 51 and falls from the drop hole 111 of the table 11 to the receiving tray below the table for manual access.

[0059] The resistor selection device for laser diodes in the above embodiment of the present invention eliminates manual intervention during the resistor selection process, completing the entire process mechanically. The resistor value determination is accurate and fast. The hardware control system utilizes a servo control system, which is high-speed, stable, and reliable, significantly improving production efficiency. This relieves manual labor from the arduous selection process, eliminates human error, and significantly reduces the scrap rate caused by this process.

Claims

1. A resistance matching device for a laser diode, comprising a frame and a control circuit, wherein the frame comprises a table, characterized in that: It includes a programmable variable resistor, an optical power measuring mechanism, a resistor feeding mechanism and a resistor grabbing mechanism, and the control circuit includes a controller; the laser diode and the programmable variable resistor are connected in series and energized, and the controller changes the resistance value of the programmable variable resistor step by step according to the set program, and the optical power measuring mechanism measures the power of the laser diode and feeds back the power value of the laser diode to the controller; when the power value of the laser diode reaches the set value, the resistance value of the programmable variable resistor is the selected resistance value; the controller controls the resistor grabbing mechanism to grab the resistor corresponding to the selected resistance value from the resistor feeding mechanism and send it to the specified position; the optical power measuring mechanism includes an optical power meter, a photosensor, a through-beam photoelectric sensor and a detection seat, the laser diode, the photosensor and the through-beam photoelectric sensor are installed in the detection seat, and when the through-beam photoelectric sensor senses that the laser diode is installed in place, it sends a signal to the controller; the photosensor converts the luminous intensity of the laser diode into an electrical signal, and inputs it into the optical power meter, and the optical power meter converts the electrical signal sent by the photosensor into The power value signal is transmitted to the controller; the detection seat includes a base plate, a cover plate, a clamping cylinder, a base and two angle adjustment plates, and the cover plate is fixed on the top of the base plate; the cover plate includes a through hole orthogonal to the main plane of the cover plate, the clamping cylinder is fixed on the top surface of the cover plate, and the piston rod faces the through hole; a movable pressure block is installed on the piston rod; the through hole is away from the side of the clamping cylinder; a V-shaped block is installed on the top surface of the cover plate; a mounting hole for a photosensor is provided on the base plate, and the mounting hole for the photosensor is connected to the through hole; a through-type photoelectric sensor is installed on the cover plate In the groove, the optical path of the through-type photoelectric sensor is orthogonal to the through hole; the control terminal controller of the drive module of the clamping cylinder; the detection seat includes a base fixed on the table, including two vertical plates, and two angle adjustment plates are respectively fixed on the inner sides of the two vertical plates; the angle adjustment plate includes a hinge hole and an arc hole, and the arc line of the arc hole takes the axis of the hinge hole as the center of the circle; both sides of the base plate include a hinge shaft and a threaded hole, and the hinge shaft of the base plate passes through the hinge hole of the corresponding angle adjustment plate; the base plate fixing screw passes through the arc hole and is screwed into the threaded hole on the side of the base plate.

2. The resistance matching device according to claim 1, characterized in that: The resistor grasping mechanism includes an X-axis motion mechanism, a Z-axis motion mechanism and a vacuum suction mechanism. The X-axis motion mechanism includes a linear slide driven by a servo motor, which is fixed above the table through a support and arranged along the X-axis direction; the Z-axis motion mechanism includes a mounting seat, a linear guide pair, a stepper motor and a toothed belt mechanism driven by the stepper motor. The mounting seat of the Z-axis motion mechanism is fixed on the slider of the linear slide; the guide rail of the linear guide pair is vertically fixed on the mounting seat, and the slider of the linear guide pair is connected to the belt clamp on the toothed belt of the toothed belt mechanism; the vacuum suction mechanism includes a vacuum pipe, a vacuum nozzle, a vacuum sensor and a vacuum air source controlled by a controller; the vacuum pipe is fixed on the slider of the linear guide pair, and the upper end is connected to the vacuum air source; the vacuum nozzle is installed at the lower end of the vacuum pipe, and the vacuum sensor is connected to the vacuum pipe; the control end of the servo motor, the control end of the stepper motor and the signal output end of the vacuum sensor are respectively connected to the controller.

3. The resistance matching device according to claim 2, characterized in that: It includes a blanking mechanism, which includes a chute and a support frame. The chute is fixed on the table through the support frame and is arranged below one end of the X-axis motion mechanism. The table includes a blanking hole, and the outlet of the lower end of the chute faces the blanking hole.

4. The resistance matching device according to claim 2, characterized in that: The resistor feeding mechanism includes a feeder base and resistor feeders whose quantity corresponds to the required resistance value specifications; the feeder base is fixed on the table, and the bottom of the resistor feeder is fixed on the feeder mounting seat corresponding to the feeder base; the discharge ports of all resistor feeders are arranged along the X-axis direction.

5. The resistance matching device according to claim 1, characterized in that: The programmable variable resistor includes multiple controllable resistance units and two wiring ports. The controllable resistance unit includes a resistor and a relay. The relay contacts of the controllable resistance unit are connected in parallel with the resistor; the resistors of all the controllable resistance units are connected in series between the two wiring ports; and the control terminal of the controllable resistance unit relay is connected to the controller.

6. The resistance matching device according to claim 2, characterized in that: The operation of the resistance matching device includes the following steps: The operator connects the laser diode to be matched with the resistor in series with the programmable variable resistor and turns on the power supply; The operator inserts the laser diode into the through hole of the detection seat. When the through-beam photoelectric sensor senses that the laser diode is installed in place, it sends a signal to the controller. The controller drives the clamping cylinder to clamp the laser diode; The controller reduces the resistance of the programmable variable resistor step by step according to the set program, and the power of the laser diode increases step by step; The electrical signal output by the photosensor increases with the power of the laser diode. The optical power meter converts the electrical signal output by the photosensor into the power value of the laser diode and transmits it to the controller. When the power value of the laser diode reaches the set value, the resistance value of the programmable variable resistor is the selected resistance value; The controller drives the X-axis motion mechanism according to the selected resistance value, and moves the vacuum nozzle on the Z-axis motion mechanism along the X direction to the resistor feeding mechanism above the resistor corresponding to the selected resistance value; The stepper motor drives the suction nozzle downward to the resistor to be sucked, the controller turns on the vacuum air source, and after the suction nozzle sucks the selected resistor, the stepper motor drives the suction nozzle upward to leave the resistor feeding mechanism; The X-axis motion mechanism moves the suction nozzle of the Z-axis motion mechanism and the adsorbed resistor along the X direction to the specified position. The Z-axis motion mechanism moves downward, the vacuum tube breaks the vacuum, and the vacuum nozzle releases the optional resistor.

7. The resistance matching device according to claim 6, characterized in that: The programmable variable resistor includes multiple controllable resistance units and two wiring ports. The controllable resistance units include resistors and relays. The relay contacts of the controllable resistance units are connected in parallel with the resistors. The resistors of all the controllable resistance units are connected in series between the two wiring ports. The control terminal of the controllable resistance unit relay is connected to the controller. The initial resistance value of the programmable variable resistor is greater than or equal to the resistance value of the maximum resistance supplied by the resistor feeding mechanism. The controller closes the contacts of the controllable resistance unit relay one at a time to stepwise reduce the resistance value of the programmable variable resistor.

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