Browse Prior Art Database

Method for Steering Imaged Thin Film Rolls

IP.com Disclosure Number: IPCOM000107905D
Original Publication Date: 1992-Mar-01
Included in the Prior Art Database: 2005-Mar-22
Document File: 1 page(s) / 51K

Publishing Venue

IBM

Related People

Busacco, RA: AUTHOR [+4]

Abstract

An accurate method of steering imaged wide web thin film material through a process tool is accomplished by first including a guideline (1) down the center of the circuit artwork. This guideline, usually .040 inch in width, will have a direct locational relationship to the circuit pattern (2), since both are exposed from the same artwork.

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Method for Steering Imaged Thin Film Rolls

      An accurate method of steering imaged wide web thin film
material through a process tool is accomplished by first including a
guideline (1) down the center of the circuit artwork.  This
guideline, usually .040 inch in width, will have a direct locational
relationship to the circuit pattern (2), since both are exposed from
the same artwork.

      The steering system consists of a sensor (3) which detects
reflected light from both sides of the center guideline.  If an
imbalance occurs the sensor will transmit a positive or negative
voltage to the servo steering mechanism on the Roll Handler (4) to
correct this condition. The servo motor moves the shaft in or out,
thereby repositioning the product roll.  This continuous adjustment
will keep the product roll in line with the process station.

      The sensor position can be fine tuned electronically in a
linear or rotary direction by inputting a calibrated signal into the
sensor positioning system (5).  This is used initially to establish a
locational relationship between the sensor, wide web roll, and the
process station.

      The sensor output, a  dc voltage, can be monitored on the
sensor output meter (6).  The fluctuation in voltage will indicate
how well the steering mechanisms are interacting.  An audible alarm
is provided to alert an operator that minor steering problems exist
and a window circuit will shut the process down if the steering
proble...