The invention discloses a PCB
light painting film expansion and shrinkage automatic measurement method, which comprises a detection table, a feeding mechanism is arranged outside the detection table, the feeding mechanism comprises a
fixed frame, the outer surface of the detection table is fixedly connected with the outer surface of the
fixed frame, two sliding plates are arranged at the top of the
fixed frame, and the two sliding plates are arranged on the detection table. Wherein the outer surface of one sliding plate is movably connected with the interior of the fixed frame, the tops of the two sliding plates are fixedly connected with carrying tables, the interior of each carrying table is provided with a film, the bottom of the other sliding plate is fixedly connected with two sliding strips, and the bottoms of the two sliding strips are slidably connected with fixed strips in an embedded mode. The problems that when an existing film is used, the expansion and shrinkage situation needs to be manually measured, efficiency is low, the measurement process is tedious, measurement errors are prone to occurring, meanwhile, the expansion and shrinkage situation exceeding an allowable range is difficult to rapidly recognize through manual measurement, and therefore the
quality control difficulty is increased are solved.