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Title:
SECURITY SYSTEM USING IR BEAM,IR TRANSMITTER-RECEIVER AND RADIO COMMUNICATION APPARATUS USED THEREIN
Document Type and Number:
Japanese Patent JP2005294990
Kind Code:
A
Abstract:

To build a system over a wider area at a low cost which displays functions by a simple operation.

A plurality of IR transceivers 1-B cascaded to IR transceivers 1-A by IR beams are connected to IR receivers 11R of an IR transceiver 1-C by IR beams, an IR beam emitter 11S of the IR transceiver 1-C sends an IR beam to a radio communication apparatus 2 to relay a beam receive-off detected by the IR transceivers 1-B, 1-C to a beam emit-off. The radio communication apparatus 2 decides the receive-off of the IR beam to be abnormal, if any one is detected, and calls out pre-registered addresses to send a warning message thereto from an automatic transmitter 25. The IR transceiver 1-B emits and receives a simple IR beam, and the radio communication apparatus 2 may use a portable telephone having a function for receiving the IR beam and an automatic transmitting function as a substitute, thereby building a cheaper system.


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Inventors:
ICHIKAWA TAKEHIRO
Application Number:
JP2004103920A
Publication Date:
October 20, 2005
Filing Date:
March 31, 2004
Export Citation:
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Assignee:
NEC CORP
NEC MOBILING LTD
International Classes:
G08B13/183; H04B7/26; H04M1/00; H04M11/04; (IPC1-7): H04M11/04; G08B13/183; H04B7/26; H04M1/00
Domestic Patent References:
JPH03132897A1991-06-06
JP2003032377A2003-01-31
JP2001309453A2001-11-02
JP2001057600A2001-02-27
JPH08167928A1996-06-25
JPH0946451A1997-02-14
JPH10162258A1998-06-19
JPH0665989U1994-09-16
Attorney, Agent or Firm:
Kenho Ikeda
Shuichi Fukuda
Takashi Sasaki



 
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