Time-variable control for lamp intensity
US4395661A · kind A · utility
Inventor
Key dates
| Filing date | Jul 6, 1981 |
| Grant date | Jul 26, 1983 |
| Priority date | — |
| Expiry date | Jul 6, 2001 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B39/02
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A time-variable illumination control apparatus for a lamp permits light intensity to be gradually increased starting at a predetermined time. The intensity control includes a clock-timer to initiate time-variable power supply network. The illumination control apparatus is designed for use on mornings when a user would commonly arise before daylight. By setting the illumination control apparatus to gradually increase the light intensity of a lamp prior to awakening, the lamp simulates sunrise so that the eyes gradually adjust to the light while sleeping. Upon awakening, the eyes are fully adjusted to the light and eye discomfiture from a sudden increase in intensity is avoided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.