Laser Bent-Pin Detector
Original Publication Date: 1987-Aug-01
Included in the Prior Art Database: 2005-Feb-01
The robotic insertion of pinned modules into printed circuit boards requires a method of detecting bent pins on the module before insertion into the module's socket. Because the edges of straight pins are parallel they produce colinear diffraction patterns forming one narrow band of light. A bent pin produces a light pattern which is skewed with respect to the pattern of the straight pins. The application of a laser, as a light source, and an optical array detector, to detect the light pattern generated by bent pins, works in the following manner. A laser 1 emits a laser beam 2 in the direction of an optical array detector 3. A robot gripper 4, having jaws 5 for gripping a module 6, moves module 6 in a vertical scanning motion, as indicated by arrow A.