Patent ID: 8480239

Claim:
An optical device comprising: multiple reflective spatial light modulation devices each of which applies, with respect to multiple rays of incident light having different wavelength bands, an image signal corresponding to each of the rays of incident light and rotates a polarization direction of each of the rays of incident light for a modulated output; multiple polarization elements each of which causes each polarization component of each of the rays of incident light in a specific direction to be transmitted and incident upon each of the spatial light modulation devices and reflects the polarization component in a direction rotated by each of the spatial light modulation devices; a light synthesis device which synthesizes multiple rays of reflected light reflected by each of the polarization elements to be output as one ray of image light; and a securing member which simultaneously secures each of the polarization elements in a position such that each of the spatial light modulation devices and each of the polarization elements correspond with each other; wherein the securing member is secured to the light synthesis device, and wherein the securing member includes an upper flat-shaped plate and a lower flat-shaped plate in which each of the polarization elements are secured to both the upper flat-shaped plate and the lower flat-shaped plate.