Calibration method in a chip mounting device
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United States of America Patent
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Mar 11, 2008
Grant Date -
May 19, 2005
app pub date -
Dec 21, 2004
filing date -
Nov 14, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method of accurately calibrating a movement control system of mark recognition means in a chip mounting device, comprising the steps of: recognizing a first recognition mark put on a head (2) and a second recognition mark (13) put on a stage (26) with two-field recognition means (7) so as to calibrate and update the preceding control parameters inputted into the movement control system of the two-field recognition means (7); and, with the head (2) lowered to position the first recognition mark closely to the second recognition mark (13), recognizing both marks with third recognition means (20) when the two-field recognition means (7) is moved back so as to calibrate and update the preceding control parameters inputted into the movement control system of the two-field recognition means (7).
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