Position feedback enhancement over a limited repositioning area

Details Position feedback enhancement over a limited repositioning area Position feedback enhancement over a limited repositioning area

1987-09-17

1989-03-14

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

901 47, G01N 2186

Patent

active

048126667

ABSTRACT:
The invention is directed to a method and apparatus for providing an auxiliary feedback of the position of a pick and place spindle during multi-image repositioning of the spindle at the inspection station, wherein the auxiliary feedback is sufficiently precise to meet lead inspection requirements which are not met by the existing encoder. The auxiliary feedback is achieved by attaching a mapping plate with very accurately spaced reference marks onto the pick and place head and by mounting a second sufficiently precise camera adjacent the inspection station so that at least one reference mark or fiducial of the mapping plate is always in the field of view of the second camera while the component is at the inspection station.

REFERENCES:
patent: 4233625 (1980-11-01), Altman
patent: 4676649 (1987-06-01), Phillips

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