Patent ID: 6268920
Filing Date: 2001-07-31
Classification: G03F,H05K

Abstract:
Positioning apparatus for selectively orienting one layer having at least two spaced-apart viewing areas and a plurality of apertures therethrough within each viewing area, relative to upper and lower layers each having distinguishable inspection targets thereon for viewing relative to an aperture in each of the viewing areas in the one layer, the apparatus comprising:sensors optically aligned with each viewing area to include the plurality of apertures through such one layer positioned with respect to the sensors for producing output signals indicative of images sensed relative to each of the plurality of apertures within each of the viewing areas;position translators for attachment to at least a pair of layers in the set of such one layer and the upper and lower layers and responsive to positioning signals applied thereto for selectively positioning such pair of layers with respect to orthogonal axes and relative to the remaining one of the set of layers; anda processor coupled to receive the output signal from the sensors for detecting within the images represented thereby the selected inspection targets on the upper and lower layers and the plurality of apertures through such one layer in each of the viewing areas thereon for determining the relative positioning thereof to supply positioning signals to each of the position translators for selectively relatively positioning the pair of layers and the remaining one of the set of layers with inspection targets and apertures substantially aligned.