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Browse Prior Art Database

Planar Image Transfer Mechanism for Surface Mount Placement Machines And Other Vision Inspection Systems

IP.com Disclosure Number: IPCOM000103190D
Original Publication Date: 1990-Aug-01
Included in the Prior Art Database: 2005-Mar-17
Document File: 1 page(s) / 47K

Publishing Venue

IBM

Related People

Grant, JS: AUTHOR

Abstract

Disclosed is an optical system which allows the transfer of an optical image located in a plane to a visual sensing device located in the same plane. This method can be utilized on gantry style machines for the placement of electronic components.

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This is the abbreviated version, containing approximately 100% of the total text.

Planar Image Transfer Mechanism for Surface Mount Placement Machines And Other Vision Inspection Systems

      Disclosed is an optical system which allows the transfer of an
optical image located in a plane to a visual sensing device located
in the same plane.  This method can be utilized on gantry style
machines for the placement of electronic components.

      Two prisms are utilized to achieve the desired effect as shown
in the figure.  These prisms optically transfer the visual mage of
the lower side of the electronic component to the camera lens while
the camera is mounted in an axis parallel to, but offset from, the
placement axis.  This configuration allows for simple fixed camera
mounting without requiring the XY table to move out of the way to
permit an upward looking camera to view the component.  This method
also eliminates the need for the placement head to move in either
transverse direction to permit a camera to view the component.

      This method is not sensitive to small errors in the
repeatability of the move of the XY table under the camera due to the
fact that the image will be transferred through the prisms correctly
as long as the error does not move the image out of the prisms.  This
method also minimizes the error since the placement accuracy of the
machine only depends on the accuracy of the XY table used.

      Disclosed anonymously.