Rain sensor with improved avoidance of reflected light
US4987296A · kind A · utility
27Cited by
2References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 10, 1989 |
| Grant date | Jan 22, 1991 |
| Priority date | — |
| Expiry date | Aug 10, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V8/10
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A rain sensor operates such that when a raindrop cuts off a direct light beam from a transmitter to a detector, the output level of the detector is lowered. A convex member is disposed to prevent a portion of the light emitted from the transmitter from reflecting and then reaching the detector. Thus, detecting error due to such reflected light is reduced.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.