Fluorescent lamp controller and original-document exposing apparatus a having the fluorescent lamp contoller
US5659227A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 26, 1995 |
| Grant date | Aug 19, 1997 |
| Priority date | — |
| Expiry date | Jun 26, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B41/295
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A fluorescent lamp controller for an original-document exposing apparatus includes a detection circuit for detecting the quantity of light emitted by a fluorescent lamp, an actuator for applying between filaments of the fluorescent lamp a voltage having a duty that is determined in accordance with the quantity of light detected, and a preheating circuit for preheating each of the filaments of the fluorescent lamp by applying a preheating voltage. According to the present invention, the actuator applies, between the filaments of the fluorescent lamp, a voltage having a duty which is smaller than the full duty regardless of a result of the quantity of light detected in a predetermined period at a start of turning the fluorescent lamp on, and the preheating circuit applies the preheating voltage to each of the filaments of the fluorescent lamp simultaneously with the application of the turning on voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.