Printed Circuit Board Through-Hole Inspection Using Video Camera
Original Publication Date: 1987-Aug-01
Included in the Prior Art Database: 2005-Feb-01
A video camera for through-hole inspection is provided with an integral pressing member which, at the time of inspection, is brought into contact with the multilayer printed circuit board under inspection to press it against the support plate. This technique serves to correct warp of the circuit board and suppress vibration of the camera, facilitating focusing of the camera. In the figure, the circuit board 10 to be inspected for epoxy smears in the through-holes is placed on a frosted glass support plate 12 with its underside illuminated by lamps 14. The video camera 16 is supported by a positioning device 22 capable of providing three dimensional positioning. The optical axis of the camera 16 is slanted with respect to vertical axis.