Time:2021-06-26 Author: hztest
Triode is one of the basic components of semiconductor, has the effect of current amplification, is the core component of electronic circuit. The transistor is in a semiconductor substrate to produce two PN junctions very close to each other, the two PN junctions divide the whole semiconductor into three parts, the middle part is the base region, the two sides of the part is the emission region and the collector region, the arrangement of PNP and NPN two kinds.
一、Triode product testing requirements::
1、H/S Offset (less than 25MIL)
2、There is excess glue on the pin
3、Pin Distortion
4、Package failure
5、Package flash/glue overflow
二、Technical analysis
1.1Connection diagram (product front lighting)
Note:
Front lighting is divided into two steps (two light sources need to be switched and photographed twice)
a、Detect characters, package breakage and pin distortion with a white ring light source (strong light)
b、Use white coaxial light source (low light) to detect pin overflow and package overflow
1.2Connection diagram (product back lighting)
Note: Back lighting is divided into two steps (two light sources need to be switched and photographed twice)
a、Offset with white ring light source (strong light), package damage and pin distortion
B、Use white coaxial light source (low light) to detect pin overflow and package overflow
1.3Connection diagram (four sides of the product are illuminated, the following is a unilateral diagram on the left side, the other three sides are the same)
Note: One camera for each of the four sides.
The side camera detects glue overflow, package breakage, package flash and overflow on the pin
三、Work flow chart
四、Software process flow chart
Note:
a、Check the number and tilt of pins with the pin measuring tool
b、Use character recognition tools to identify words
Note:
a、Use the patch detection tool to detect heat sink overflow
b、Use a patch detection tool to detect pin overspill
Note:
a、Use the edge Grip tool to grab two edges, then calculate the Angle of the two edges
Note:
a、The patch detection tool detects heat sink overflow
b、Use the patch detection tool to detect pin overflow
Note:
a、The patch detection tool detects package damage
b、Use the patch detection tool to detect pin overflows and package flash edges
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