Angled sensors for detecting substrates

Details Angled sensors for detecting substrates Angled sensors for detecting substrates

2006-01-31

2006-01-31

Allen, Stephone B. (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

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

C250S559400, C356S237200, C356S600000, C356S445000, C414S935000

Reexamination Certificate

active

06992316

ABSTRACT:
In a first aspect, an apparatus is provided for detecting substrates. The apparatus includes (1) a transmitter/receiver unit adapted to transmit a light beam through a substrate located within a transfer chamber; (2) a reflector adapted to receive the light beam transmitted from the transmitter/receiver unit and to reflect the transmitted light beam toward the transmitter/receiver unit; and (3) a controller coupled to the transmitter/receiver unit and adapted to determine whether a substrate is positioned between the transmitter/receiver unit and the reflector based on an intensity of the reflected light beam received by the transmitter/receiver unit. At least one of the transmitted and reflected light beams is adapted to strike a substrate positioned between the transmitter/receiver unit and the reflector with non-normal incidence. Numerous other aspects are provided.

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