IMAGE PROJECTION SYSTEM BY MEANS OF DIRECT CURRENT TYPE HIGH VOLTAGE DISCHARGE
First Claim
1. An image projection system comprising a DC high-intensity discharge lamp, a rotary color filter which separates a first light flux applied from the high-pressure discharge lamp into a plurality of colors, a reflective optical element which gives gradation to and performs picture signal-based modulation on a second light flux having passed through the color filter, DC lighting means for driving the high-pressure discharge lamp with a direct current, a projection lens system which projects a third light flux reflected by the optical element onto a screen, and a synchronization signal generating device which detects rotation of the color filter and generates a synchronization signal, wherein the synchronization signal generating device generates a synchronization signal composed of a plurality of on-off patterns in synchronism with rotation of the color filter and outputs each of predetermined power levels corresponding one-to-one with the on-off patterns to the high-pressure discharge lamp at fixed timing.
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Accused Products
Abstract
The image projection system is capable of freely adjusting a tone to suit user preferences. The system has a synchronization signal generating device that generates a synchronization signal composed of a plurality of on-off patterns in synchronism with rotation of a color filter and outputs each of predetermined power levels corresponding one-to-one with the on-off patterns to the high-pressure discharge lamp at fixed timing.
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Citations
3 Claims
- 1. An image projection system comprising a DC high-intensity discharge lamp, a rotary color filter which separates a first light flux applied from the high-pressure discharge lamp into a plurality of colors, a reflective optical element which gives gradation to and performs picture signal-based modulation on a second light flux having passed through the color filter, DC lighting means for driving the high-pressure discharge lamp with a direct current, a projection lens system which projects a third light flux reflected by the optical element onto a screen, and a synchronization signal generating device which detects rotation of the color filter and generates a synchronization signal, wherein the synchronization signal generating device generates a synchronization signal composed of a plurality of on-off patterns in synchronism with rotation of the color filter and outputs each of predetermined power levels corresponding one-to-one with the on-off patterns to the high-pressure discharge lamp at fixed timing.
Specification