Visual quality checking device for solder joints in ball grid array of surface-mount device, has endoscope in stabilizing sheath bent through up to 90 degrees

摘要

An endoscope (7) has a stabilising sheath (9), an objective lens positionable w.r.t. the solder joint to be tested, and an independently positionable light source. The stabilizing sheath is bent (11) through an angle in the range 45 to 90 degrees immediately in front of its distal end on the objective lens side. The sheath is aligned so that the axis of the light guide (8) in the lens region lies in the x-y plane, and the axis of the light guide lies on the z-axis or on an axis in the y-z plane that deviates by up to 45 degrees from this.