Head lamp control circuit
US4238709A · kind A · utility
15Cited by
3References
5Claims
0Family size
Inventor
Key dates
| Filing date | Jul 5, 1978 |
| Grant date | Dec 9, 1980 |
| Priority date | — |
| Expiry date | Jul 5, 1998 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B20/00
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A battery powered variable intensity hat mounted head lamp with a lamp shell mounting a lens and reflector assembly including an oscillator switching a power transistor mounted on the lamp shell for heat dissipation to control the lamp bulb, a printed circuit board in the lamp shell mounting the lamp bulb and the oscillator components, and a potentiometer mounted on the lamp shell for simultaneously varying both the on time and the off time in the duty cycle of the oscillator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.