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Pick and place machine with improved component placement inspection

  • US 7,559,134 B2
  • Filed: 10/21/2004
  • Issued: 07/14/2009
  • Est. Priority Date: 11/04/2003
  • Status: Expired due to Fees
First Claim
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1. A pick and place machine for placing a component upon a workpiece, the machine comprising:

  • a placement head configured to undergo relative motion with respect to the workpiece having at least one nozzle for releasably holding the component;

    an image acquisition device coupled to the placement head disposed to acquire at least one image of a placement location on the workpiece of the component, wherein the image acquisition device employs an optical axis that is inclined relative to a plane of the workpiece; and

    a position sensing device disposed to provide an output indicative of the position of the placement head relative to the workpiece;

    wherein the position sensing device is a rotary encoder coupled to a shaft of the pick and place machine that rotates 360 degrees per placement and wherein the position sensing device output is used to determine the timing of at least one image acquisition.

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