Film area computer
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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Aug 4, 1987
Grant Date -
N/A
app pub date -
Nov 13, 1984
filing date -
Nov 13, 1984
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An instrument for use with a film containing a printed circuit layout. The instrument measures the area which is transparent to electromagnetic radiation of a characteristic wavelength so that the open area of the film and the average open area can be calculated and displayed. A source oriented in a direction perpendicular to the transport path emits radiation of the characteristic wavelength across a width of the film. A plurality of detecting devices responsive to the characteristic wavelength are arranged in a linear array in optical coordination with the source. Each detecting device detects radiation transmitted through an incremental area of the film and produces an output signal representative thereof. A detector circuit connected to receive the output signals repeatedly and sequentially provides digital area signals proportional to the amount of clear area within a respective incremental area of film. A microcomputer receives the area signals and computes the total clear area. A digital display provides a visual indication of the total clear area.
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