REFLECTION MEMBER AVAILABLE FOR HEAT SHIELD USE AND PROJECTOR INCLUDING REFLECTION MEMBER

摘要

The present invention provides a reflection member including a selective reflection layer; and two ¼ wavelength phase difference plates, in which the selective reflection layer is disposed between the two ¼ wavelength phase difference plates, the selective reflection layer includes a layer of a fixed cholesteric liquid crystal phase having a central wavelength of selective reflection at a visible light range wavelength λi, and the selective reflection layer includes a layer in which a twisted direction of a helix of a cholesteric liquid crystal is only one of right or left as the layer of a fixed cholesteric liquid crystal phase having selective reflection at the wavelength λi. The reflection member of the present invention can be used particularly as a heat shielding member, which can reduce damage to the optical systems due to external light including visible light while efficiently extracting projected light.

主权项

1. A reflection member for shielding an optical system that projects linearly polarized light from heat, comprising:
a selective reflection layer; and two ¼ wavelength phase difference plates, wherein the selective reflection layer is disposed between the two ¼ wavelength phase difference plates, the selective reflection layer includes a layer of a fixed cholesteric liquid crystal phase, having a central wavelength of selective reflection at a wavelength λi in a wavelength range of the linearly polarized light, and the selective reflection layer includes a layer in which a twisted direction of a helix of a cholesteric liquid crystal is only one of right or left as the layer of a fixed cholesteric liquid crystal phase having a central wavelength of selective reflection at the wavelength λi.