OPTICAL DEFLECTOR AND IMAGE DISPLAY DEVICE

摘要

PROBLEM TO BE SOLVED: To suppress a ratio of noise light at the time of deflection of incident light. SOLUTION: A polarization direction switching means 4 which is disposed between a plurality of optical deflection elements 2 and 3 disposed in a plurality along an incident direction of light to respectively change exit optical paths for the incident light according to a change in electric field and switches the polarization direction of the incident light is constituted of a half wavelength retardation plate set in such a manner the retardation Re(λ) for an incident light wavelengthλ(nm) of the case the range of the incident light wavelength (nm) is 436 (nm)<λ<700 (nm) satisfies 0.968