Browse Prior Art Database

Component Placement Technique

IP.com Disclosure Number: IPCOM000112662D
Original Publication Date: 1994-Jun-01
Included in the Prior Art Database: 2005-Mar-27
Document File: 2 page(s) / 53K

Publishing Venue

IBM

Related People

Glassman, E: AUTHOR

Abstract

Aligning a manipulator head to a pair of preprinted fiducial marks on a component bonding tape, picking up the component tape, and in turn aligning the component-tape-carrying manipulator head to a related pair of fiducial marks on a board, results in fine positioning of component on board with minimal error.

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Component Placement Technique

      Aligning a manipulator head to a pair of preprinted fiducial
marks on a component bonding tape, picking up the component tape, and
in turn aligning the component-tape-carrying manipulator head to a
related pair of fiducial marks on a board, results in fine
positioning of component on board with minimal error.

      In Fig. 1, component 1, a tape automated bonding component for
carrying chip 2 in this instance, has a pair of fiducial locating
marks 3 and 4 preprinted thereon.  Component receiving circuit board
5 likewise has a pair of preprinted fiducial locating marks 6 and 7.
Robotic manipulator 8, with vacuum lift ports 9 for carrying
component 1, has optical fiber sensors 11-14, each arranged to sense
a respective one of fiducial marks 3,4,6, and 7 on the component and
circuit board.

      Individual sensor construction is shown in Fig. 2, where light
from optical fiber 15 illuminates fiducial mark 16 that reflects
light into surrounding fibers 17 and detectors, not shown.  Detector
signals in turn control manipulator 8 along both x and y coordinates
and rotationally.

      In operation, manipulator 8 is lowered over a component 1 until
sensor 11 detects its fiducial mark 3 in the center of sensing fibers
17.  Manipulator 8 is controlled rotationally about sensor 11 until
sensor 12 detects and centers its mark 4.  Vacuum ports 9 thereafter
lift and carry component 1 to board 5.  Manipulator motion is
controlled...