Electronic control system for automatic rearview mirrors for automotive vehicles
US4580875A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 30, 1984 |
| Grant date | Apr 8, 1986 |
| Priority date | — |
| Expiry date | Mar 30, 2004 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60R1/087
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
An electronic control system for automatic rearview mirrors for automotive vehicles, the control system being effective to detect and compare the relative brightness of light forwardly and rearwardly of the vehicle and respond automatically to annoying glare from the rear of the vehicle and move a reflective element from a full reflective mode to a partial reflective mode and thereafter automatically return the reflective element to a full reflective mode after the source of the annoying glare is removed, the glare threshhold being determined as a function of the ambient light level, of a long, smoothed time average of the ambient light level, of a short smoothed time average of the glare producing light level, and of the recent activity of the mirror.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.