Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1993-04-29
1995-03-28
Hofsass, Jeffery A.
Communications: electrical
Condition responsive indicating system
Specific condition
340576, 351210, G08B 2300
Patent
active
054021090
ABSTRACT:
This invention is an eyeglass attachable alarm signal device for automobile and truck drivers, preventing them to fall asleep, while driving. It is designed both for daytime and for nighttime driving. A beam of a narrow-band light of any color is used for optical sensing, whether the driver's eyelids are closed or are in an open position. The use of infrared light is preferred, because infrared light generates least distraction to the driver. A tiny slide-adjustable light emitter carrier, sliding along the eyeglass temple, is used for positioning the light emitter on the eyeglass properly for each driver. A narrow-band light beam from this emitter is aimed across the surface of the driver's eye, just above the eyeball, between the eyelids, and it is sensed in the opposite corner of the eye by means of a light sensor, which has a narrow band light filter mounted in front of it. For infrared light preferably the Kodak's Wratten filter #87 or #87 C is used. For waking up the driver, whose eyes have been closed for a longer time period than about one second or less, an electronic circuitry is activated by means of the closed-eye signal from the light sensor, turning on an alarm signal, a buzzer or similar, after a one second or shorter time delay.
REFERENCES:
patent: 4144531 (1979-03-01), Anbergen
patent: 4875030 (1989-10-01), Chiu
patent: 4967186 (1990-10-01), Ludmirsky et al.
Hofsass Jeffery A.
Lee Benjamin C.
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