LIGHTING DEVICE AND PROJECTOR

摘要

In a lighting device, light in a first wavelength range which is output from a light emitting element passes through a first phase difference plate, and is separated into a first light flux and a second light flux by a polarization separation element. A wavelength conversion unit converts the first light flux to a third light flux. An optical element converts the second light flux into a fourth light flux. A first color combining element combines the third light flux with the fourth light flux. A first control unit changes a direction of an optical axis of the first phase difference plate according to an intensity of the third light flux and an intensity of the fourth light flux.

主权项

1. A lighting device comprising:
a light emitting element which outputs light in a first wavelength range; a first phase difference plate to which the light output from the light emitting element is input; a first polarization separation element which separates the light from the first phase difference plate into a first light flux in a first polarization state, and a second light flux in a second polarization state; a wavelength conversion unit which includes a first fluorescent substance layer which is excited by the light in the first wavelength range, and converts the first light flux into a third light flux in a second wavelength range which is different from the first wavelength range; an optical element which converts the second light flux into a fourth light flux; a first color combining element which combines the third light flux with the fourth light flux; a first detection unit which detects an intensity of the third light flux and an intensity of the fourth light flux; and a first control unit which changes a direction of an optical axis of the first phase difference plate according to a detection result which is obtained by the first detection unit.