Vehicle marker light
US4654629A · kind A · utility
202Cited by
39References
16Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 2, 1985 |
| Grant date | Mar 31, 1987 |
| Priority date | — |
| Expiry date | Jul 2, 2005 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S362/80
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A marker light using an array (2) of light emitting diodes (12) in combination with lenses (3) provides a light beam of required intensity, shape and color for railroad applications. The light emitting diodes are arranged in various configurations to form the array (2). The lenses may be Fresnel lenses. Control circuitry (C) energizes the light emitting diodes at predetermined or variable flashing rates. Sensing circuitry (222) senses the failure of light emitting diodes in the array and provides an indication of such failure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.