초록 ▼

A system is provided for determining the widths and spacings of substantially parallel opaque stripes on a substrate, wherein the stripes are separated by openings. The system comprises a light source for illuminating the substrate and photodetecting means positioned to receive light from the illumi

A system is provided for determining the widths and spacings of substantially parallel opaque stripes on a substrate, wherein the stripes are separated by openings. The system comprises a light source for illuminating the substrate and photodetecting means positioned to receive light from the illuminated substrate. Means are included for scanning the photodetecting means transverse to the stripes and for sweeping the photodetecting means in a direction substantially parallel to the stripes. The system further includes means for converting the output of the photodetecting means into a quantized signal, means for dividing the quantized signal into separate signals representing stripe widths and opening widths between stripes, and means for converting the stripe width and opening width signals into a signal representing center-to-center spacing between openings.

대표청구항 ▼

A system for determining the spacings between opaque stripes forming a light absorbing matrix on a color picture tube faceplate wherein the matrix has been formed by photoexposing the areas between the stripes in three separate exposures, said system comprising, means for illuminating said faceplate

A system for determining the spacings between opaque stripes forming a light absorbing matrix on a color picture tube faceplate wherein the matrix has been formed by photoexposing the areas between the stripes in three separate exposures, said system comprising, means for illuminating said faceplate, photodetecting means positioned to receive light from said means for illuminating, means for scanning said photodetecting means transversely across at least six stripes, means for sweeping said photodetecting means in a direction substantially parallel to said stripes, means for converting the output of said photodetecting means into a quantized signal, means for dividing said quantized signal into separate signals representing stripe widths and opening widths between stripes, means for accummulating stripe width and opening width signals associated with a particular exposure, and means for converting the accummulated stripe width and opening width signals into three signals representative of corrections to be made in the three photoexposing steps.