Light amount controlling apparatus and method for projector
US5658062A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 22, 1995 |
| Grant date | Aug 19, 1997 |
| Priority date | — |
| Expiry date | Sep 22, 2015 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF21V23/0442
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A light amount controlling apparatus includes a light source for producing light and a light source driver for driving the light source. A zoom lens unit includes a zoom lens for varying an angle of projection of the light, and a zoom lens position detector detects a position of the zoom lens. A memory stores control data corresponding to the position of the zoom lens and a memory controller reads the control data from the memory according to a detected value of the zoom lens position of the zoom lens position detector. A controller controls the light source driver to vary an amount of light projected from the light source in accordance with the control data output from the memory controller.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.