Automatic reset for personal alert safety system

Details Automatic reset for personal alert safety system Automatic reset for personal alert safety system

1998-02-02

1999-06-01

Lee, Benjamin C.

Communications: electrical

Condition responsive indicating system

Specific condition

3406936, 340600, 340575, 340576, G08B 2300

Patent

active

059091797

ABSTRACT:
Light is directed towards at least one eye of a user of a personal alert safety system (PASS), and the reflected light is sensed. When the eye blinks, there is an interruption of the reflected light signal indicating that the user is conscious. Electronic circuitry converts the variation in reflected light intensity into a corresponding variation in electrical signal. The PASS interprets this variable electrical signal as a reset indicator, so that as long as the wearer is conscious, the audio warning alarm in the PASS does not sound. The light is provided by a light emitting diode in the near infrared range, and the reflected beam may be sensed by a photodiode or phototransistor. Alternatively, ultra sound, or other light frequencies, may be used.

REFERENCES:
patent: 4196429 (1980-04-01), Davis
patent: 5745038 (1998-04-01), Vance

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