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Advanced SMT Resistor Production Process with T Marking Inspection on Ceramic Substrates

This document outlines the intricate process of manufacturing SMT resistors on ceramic substrates. The process includes multiple layers of silk screen printing, laser trimming, and critical T marking for accurate inspection. The first layer involves printing silver conductive pads, followed by black carbon film for resistor value control, and protective coatings in light green. Inspection is done using a 12 MP color camera to ensure correct layer alignment and identify defects, with a cutting threshold for faulty units. The entire production line has defined timings for quality checks.

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Advanced SMT Resistor Production Process with T Marking Inspection on Ceramic Substrates

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  1. Substrate Size 50mm x 60mm Substrate Size 70mm x 80mm T Marking Singulated SMT Resistor

  2. MK R T字線 G1 T字線 G2 T字線 C1 T字線 G2 T字線 G1 T字線 R T字線 MK R T字線 R T字線 G1 T字線 G1 T字線 G2 T字線 G2 T字線 49.5mm C1 T字線 C1 T字線 G2 T字線 G2 T字線 G1 T字線 G1 T字線 R T字線 R T字線 R T字線 G1 T字線 G2 T字線 C1 T字線 G2 T字線 G1 T字線 R T字線 MK MK 60mm T marking on substrate

  3. <12mm <12mm R T字線 G1 T字線 G2 T字線 G1 T字線 R T字線 C1 T字線 <9mm C1 T字線 <9mm R T字線 R T字線 G1 T字線 G1 T字線 MK MK 49.5mm G2 T字線 G2 T字線 MK MK G1 T字線 G1 T字線 R T字線 R T字線 <9mm <9mm C1 T字線 R T字線 G1 T字線 G2 T字線 G1 T字線 R T字線 C1 T字線 <12mm <12mm 60mm

  4. Process of making the SMT resistor 1st silk screen printing is C1 (Silver color) This is the silver conductive pad on both side of the resistor 2nd Silk screen printing is R (Black color) This is the carbon film that control the resistor value Next is G1 (Light Green colour) This is a protective cover for carbon resistor Next is Laser Trimming L cut using LaserTek machine Last is Silk Screen printing is G2 (black color) Protective cover after trimming

  5. As each layer is being printed, T marking is printed as marking Vision have to inspect the T marking to check that each layer is over lapping correctly. The T marking is also use to check if the printing is at the correct position on the ceramic substrate by using the ceramic edges as reference. The other inspection is to look for defect. If defect is found the unit need to be marked out by laser cut across the unit.

  6. Current demo machine is their production line is using a 12M pixel camera. I suspect they are using a color camera as the manager is not able to confirm The inspection time and cutting for 2% fail parts per 5540 resistor per substrate is between 4.5 to 5sec.

  7. 12 Mega Pix Colour Camera Yag Laser Lens FOV for 70x80mm Substrate Laser Scan Head with 100mm x 100mm FOV Blue LED lighting Ceramic Substrate Back LIght Ceramic Substrate Substrate Input Elevator Substrate Output Elevator Substrate NG Output Elevator Actuator Substrate Work Holder

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