Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1988-06-17
1990-07-24
Swann, III, Glen R.
Communications: electrical
Condition responsive indicating system
Specific condition
250340, 250395, G08B 1318
Patent
active
049438000
ABSTRACT:
The intrusion detection system of the invention, in which three pyroelectric detectors are disposed in line with a interval and an adjoining two of the three pyroelectric detectors are electrically connected to cancel electrical charges generated by each pyroelectric detector, detects intrusion of an infrared ray radiating object such as a human body for example by output signals outputted from the adjoining two and the other of the three pyroelectric detectors or by output signals outputted from the pyroelectric detector disposed at the center and adjoining one and output signals outputted from the one disposed at the center and adjoining another one of these pyroelectric detectors, so that precise and secure intrusion detection is possible by reducing erroneous signals generated by those pyroelectric detectors due to variation of the atmospheric temperature and the like.
REFERENCES:
patent: 3453432 (1969-07-01), McHenry
patent: 3524180 (1970-08-01), Cruse
patent: 4614938 (1986-09-01), Weitman
patent: 4745284 (1988-05-01), Masuda et al.
patent: 4799243 (1989-01-01), Zepke
patent: 4800368 (1989-01-01), Wisner
Ikeda Masami
Mizoguchi Yasunari
Tamano Akimasa
Tuji Mahito
Yamada Yasuhiro
Sanyo Electric Co,. Ltd.
Swann III Glen R.
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