Separate-type detector with redundant synchronization feature

Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system

Reexamination Certificate

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Details

C340S555000, C340S556000, C340S557000

Reexamination Certificate

active

07968837

ABSTRACT:
An object is to provide a separated sensor capable of synchronizing a light transmitting unit with a light receiving unit, without using a control line.There is provided a separated sensor including a light transmitting unit that transmits detection light to a monitoring area, and a light receiving unit that receives detection light transmitted by the light transmitting unit, the light transmitting unit and the light receiving unit laid out separately from each other. On one of the light transmitting unit and the light receiving unit, there is provided a synchronization-light transmitting unit that transmits, by wireless, synchronization light to synchronize the light transmitting unit with the light receiving unit. On the other of the light transmitting unit and the light receiving unit, there are provided a synchronization-light receiving unit that receives the synchronization light transmitted from the synchronization-light transmitting unit, and a synchronization-establishment processing unit that performs a predetermined process to establish the synchronization based on the synchronization light received by the synchronization-light receiving unit.

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patent: 5130532 (1992-07-01), Clemens
patent: 2004/0155790 (2004-08-01), Tsuji
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PCT/JP2006/30360 International Search Report.
PCT/JP2006/303260 International Search Report.
PCT/JP2006/303260 Written Opinion.
Extended European Search Report for PCT/JP2006/303260 mailed Aug. 16, 2010.
Chinese Office Action issued Apr. 19, 2011.

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