Copyright © Philip M. Parker, INSEAD. Terms of Use.
| Year | Description |
| 1997 | Invention patented by David L. Vance on March 20th, 1997. 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: selected by the editor from original sources. | |
Copyright © Philip M. Parker, INSEAD. Terms of Use.
