Awakening alarm for motor vehicle operators
US5745038A · kind A · utility
19Cited by
5References
4Claims
0Family size
Inventor
Key dates
| Filing date | Mar 21, 1997 |
| Grant date | Apr 28, 1998 |
| Priority date | — |
| Expiry date | Mar 21, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08B21/06
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
Eyeglasses hold a light sensor (1) positioned to receive light reflected from an eye. An electronic comparator circuit (4) uses variations of current through the sensor which occur during blinking and eye movement to produce pulses which reset an electronic timing cycle, thereby continually delaying the activation of an alarm signal (8). In the absence of eye motion for a predetermined period of time a warning tone is sounded in the preferred embodiment, followed by a full volume alarm if needed to wake a sleeping driver.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.