Browse Prior Art Database

Selective Scrap Process for Multiple Image Printed Circuit Boards

IP.com Disclosure Number: IPCOM000118749D
Original Publication Date: 1997-Jun-01
Included in the Prior Art Database: 2005-Apr-01
Document File: 2 page(s) / 54K

Publishing Venue

IBM

Related People

Desai, S: AUTHOR [+5]

Abstract

Disclosed is a method and apparatus providing a selective scrap process for laminate chip carrier automated optical inspection. The process allows for easy selection of previously scrapped pieces before performing inspection on the remainder of a large raw board. The inspection process is not performed on either side of a scrapped piece, thus productivity is enhanced.

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Selective Scrap Process for Multiple Image Printed Circuit Boards

      Disclosed is a method and apparatus providing a selective scrap
process for laminate chip carrier automated optical inspection.  The
process allows for easy selection of previously scrapped pieces
before performing inspection on the remainder of a large raw board.
The inspection process is not performed on either side of a scrapped
piece, thus productivity is enhanced.

      A method and apparatus has been invented which allows for easy
selection of individual circuit images on a large panel board for the
purpose of elimination from a manufacturing process, such as optical
inspection.  A prescrap station is used to view an entire large panel
on either side and provides a means of marking prescrapped pieces.
These are pieces that are already known to be defective upon arrival
in the process sector and have some kind of marking on them, or
pieces that have been found defective by previewing within that
sector.  Pieces that have been marked using the apparatus can then be
eliminated from subsequent processes on one or both sides of the
panel.

      The prescrap station consists of a light table which provides
backlit illumination, overhead lights to create a reflective
illumination, and an overhead camera and wide angle lens assembly
which provides images of the entire panel to a personal computer.
Some type of  marking on each defective piece is either recognized by
an operator or  auto...