Through hole formation state detecting device and electronic...

Details Through hole formation state detecting device and electronic... Through hole formation state detecting device and electronic...

2008-09-24

2009-12-15

Le, Que T (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

With circuit for evaluating a web, strand, strip, or sheet

C250S548000

Reexamination Certificate

active

07633075

ABSTRACT:
When a light emission element emits no light, a detected signal from a photodetection element is captured as an intensity of external light. Then, a threshold value is offset by the intensity of the external light. The offset threshold is then compared to a detected signal from the photodetection element when the light emission element emits light, thereby determining the presence of a through hole between the light emission element and the photodetection element through which hole light passes without being influenced by external light.

REFERENCES:
patent: 6310687 (2001-10-01), Stumbo et al.
patent: 5-199178 (1993-08-01), None
patent: 2000-162336 (2000-06-01), None
patent: 2002-42262 (2002-02-01), None
patent: 2007-40863 (2007-02-01), None

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