Lighting system

Abstract

The object of an illumination device of the invention is to further improve the light use efficiency of a lighting device of a color re-capture type. In a lighting device 10 of a color re-capture type, a color wheel 40 having filter films 41R-41B is located at an opening 23 of an emitting port 20b of an integrator 20, a center reflecting mirror 30 is located at an opening 22 of an incident side connected with the integrator 20 and on an optical axes 80 of a lamp 13 to reflect a light to a side of the opening 22 of the integrator 20. In the light which is not passed through the color wheel 40 to return to the integrator 20, the light 73 leaked from the opening 22 of the incident side is reflected by the center reflecting mirror 30 so as to return to the integrator 20, thereby further improving the light use efficiency.

Description

technical field [0001] The present invention relates to an illuminating device using an integrator, and more particularly, to an illuminating device of a color recapture method. Background technique [0002] In Japanese Patent Application Laid-Open No. 6-88953, a front edge reflector is provided on the front edge of a rotating parabolic reflector for collecting light from a light source forward to reflect a part of the light from a light source, and A center reflector is provided which converts the reflected light reflected by the front edge reflector into parallel light and reflects it forward. [0003] Japanese Patent Application Laid-Open No. 6-88953 proposes an illumination optical device that relays, as illumination light, only light incident on an integrator out of light emitted from a light source to a front optical system. For example, when displaying a color image in an image display device such as a so-called single-panel projector with an optical system that modu...

AI Technical Summary

Problems solved by technology

[0005] However, even with color recapture lighting devices, light utilization efficiency is not 100%.

For example, although it is an integrator that transmits light from the incident side to the exit side, the light supplied from the light source to the incident side is not 100% transmitted to the exit side

In addition, although it is hoped that the light that has not passed through the dichroic film of the color wheel returns to the integrator, is reflected on the integrator and emits toward the color wheel again, but all the reflected light on the integrator may not be effectively emitted toward the color wheel again

In addition, the light from the light source may not be effectively incident on the integrator

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