Method for detecting missing components at electrical board...

Radiant energy – Photocells; circuits and apparatus – With circuit for evaluating a web – strand – strip – or sheet

Reexamination Certificate

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Details

C250S559440, C356S237300, C324S537000

Reexamination Certificate

active

06903360

ABSTRACT:
Disclosed is a method and apparatus for determining the presence or absence of a component on a printed circuit board. The method and apparatus utilizes a photo-sensor and photo-detector that are positioned within a predetermined non-contacting distance from the expected location of a given component under test. The photo-emitter emits a controlled amount of light energy on the expected location of the component under test on the printed circuit board. The photo-sensor detects the amount of reflection off the surface of the expected location of the component under test. Because the amount of reflection differs between reflection off the surface of the component under test and reflection off the surface of the bare board, based on the reflection measurement, the component under test can be classified as either present or absent at its expected location on the printed circuit board.

REFERENCES:
patent: 5006808 (1991-04-01), Watts
patent: 5124660 (1992-06-01), Cilingiroglu
patent: 5138266 (1992-08-01), Stearns
patent: 5254953 (1993-10-01), Crook et al.
patent: 02061505 (1988-08-01), None
patent: 04348210 (1992-12-01), None

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