Infrared intrusion sensor with preliminary and primary alarms

Details Infrared intrusion sensor with preliminary and primary alarms Infrared intrusion sensor with preliminary and primary alarms

1985-08-14

1987-07-07

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

340529, 340691, G08B 1318

Patent

active

046790349

ABSTRACT:
An intrusion alarming apparatus according to this invention detects the human body present in a sensing zone thereof and sends out warning information by means of sound and light. Detection of the human body depends on a human body sensor which emits detection signals in response to variation in the strength of heat rays or interception of radiated infrared rays. Information by the use of sound and light is effected by driving a sound-using alarm such as a speaker and a light-using alarm such as a stroboscope with a sound emission driving circuit and a light emission driving circuit which operate on the basis of detection signals output by the human body sensor. The driving circuits for sound and light emission are connected to each other so as to be operated by means of a single timer circuit.

REFERENCES:
patent: 3703718 (1972-11-01), Berman
patent: 4047165 (1977-09-01), Andreasson et al.
patent: 4103285 (1978-07-01), Lloyd et al.

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