Door alarm with infrared and capacitive sensors

Details Door alarm with infrared and capacitive sensors Door alarm with infrared and capacitive sensors

1987-10-29

1989-02-14

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

340562, 340567, 340693, G08B 1300, G08B 1318, G08B 1326

Patent

active

048049450

ABSTRACT:
An alarm system for providing separate discrete signals corresponding with the approach of an individual to a door and the touching of the door knob by the individual utilizes a combination of infrared sensors and a capacitive discharge sensor. The infrared sensors are mounted on a circular ring on the face of the door knob. The sensors are angled in different directions to detect individuals approaching from various directions. The door knob is composed of a metallic material and acts as an antenna of a capacitive discharge proximity sensor. The door knob is insulated by a sleeve from the rest of the door and latch structure. Approach of an individual is detected by the infrared sensors which activates a first alarm signal. When the individual reaches for and touches the door knob, a second different alarm is activated.

REFERENCES:
patent: 3785230 (1974-01-01), Lokey
patent: 4325058 (1982-04-01), Wagner et al.

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