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Light-Activated Hole Detector for Clear Material

IP.com Disclosure Number: IPCOM000100085D
Original Publication Date: 1990-Mar-01
Included in the Prior Art Database: 2005-Mar-15
Document File: 1 page(s) / 26K

Publishing Venue

IBM

Related People

Brassfield, WC: AUTHOR [+2]

Abstract

The reflective light-hole detection sensor is a process for determining the quality of transparent material during manufacture. As the film moves at speeds of 800 feet per minute, it passes through the sensor, and its illuminated footprint on the material provides a level of reflected light into the photocells by their angular relationship. When a hole in the material passes through the illuminated footprint, the reflected light is reduced, plus the hole aligns the cell with a black-absorbing member, near the opposite side of the clear material. This reduced output difference, translated through amplifiers and scanned, is the sequence of hole identification or other abnormal surface defects. The size of the hole or object creates a corresponding volume change in the output as well.

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Light-Activated Hole Detector for Clear Material

       The reflective light-hole detection sensor is a process
for determining the quality of transparent material during
manufacture.  As the film moves at speeds of 800 feet per minute, it
passes through the sensor, and its illuminated footprint on the
material provides a level of reflected light into the photocells by
their angular relationship. When a hole in the material passes
through the illuminated footprint, the reflected light is reduced,
plus the hole aligns the cell with a black-absorbing member, near the
opposite side of the clear material.  This reduced output difference,
translated through amplifiers and scanned, is the sequence of hole
identification or other abnormal surface defects.  The size of the
hole or object creates a corresponding volume change in the output as
well.

      This hole sensor for clear material is completely unattended,
and the electronics provide a count for each defect, permitting a
roll- to-roll quality evaluation.  The reflected illumination is the
media for detection of holes.