초록 ▼

An optical unit for inspecting the soldered surface of a printed circuit board incorporates a thick-walled translucent concave diffuser dome with a hollow central cavity facing the surface under inspection, lamps directing illumination on the exterior of the dome, inspection portals spaced around th

An optical unit for inspecting the soldered surface of a printed circuit board incorporates a thick-walled translucent concave diffuser dome with a hollow central cavity facing the surface under inspection, lamps directing illumination on the exterior of the dome, inspection portals spaced around the diffuser dome for video camera inspection of the board surface, and X-Y maneuvering control means governing the relative scanning repositioning of the board surface and the dome. A light baffle between each camera and its inspection portal, incorporating alternately white and black conically chamfered rings, produces improved imaging of the inspected surface, and a flexible translucent skirt extending from the dome rim to the inspected surface, preferably formed of a large plurality of white plastic bristles, blocks direct illumination and assures substantially uniform diffused illumination of the inspected surface.

대표청구항 ▼

An optical inspection unit for inspecting an irregular surface of an object such as the solder surface of a substantially flat printed circuit board comprising means supporting the object while exposing its surface to be inspected, a maneuvering base adjacent to the supported object and having a mou

An optical inspection unit for inspecting an irregular surface of an object such as the solder surface of a substantially flat printed circuit board comprising means supporting the object while exposing its surface to be inspected, a maneuvering base adjacent to the supported object and having a mounting plate facing said surface and spaced therefrom, X-Y maneuvering means associated with said base and said object supporting means and connected to produce successive relative repositioning movements of the plate and the surface upon command, a thick-walled translucent concave dome having a hollow central cavity bounded by a rim, with the cavity being defined by an interior face arching internally away from said inspected surface, the dome being centrally mounted on the mounting plate with its central cavity opening toward and its rim closely juxtaposed to said surface, substantially blocking external illumination from passing between said rim and said surface, external illumination means aimed to direct illumination on the external face of the dome, and inspection portal means formed in the dome each defined by a portal axis intersecting a central region of said surface to be inspected, through which optical inspection of said surface can be made, whereby diffuse illumination of said surface substantially without bright spots, specular reflections or glare is produced within the cavity by attenuation of externally delivered illumination through absorption and internal reflection as it passes through the thick wall of the translucent concave dome, enhancing the precision of optical inspection of said surface performed through said inspection portal means.