OPTICAL DEVICE AND PROJECTOR

摘要

An optical device (44) comprises a holding frame (446) which holds a liquid crystal panel (441) as an optical modulator and has an opening (446C) in a portion corresponding to an image forming region of the liquid crystal panel (441), and a panel fixing plate (447) arranged between the holding frame (446) and a cross-dichroic prism (444). The panel fixing plate (447) is composed of a member whose thermal expansion coefficient is between that of the holding frame (446) and that of the cross-dichroic prism (444). The liquid crystal panel (441) is fixed to a lateral face of the cross-dichroic prism (444) via the holding frame (446) and the panel fixing plate (447). Consequently, the thermal stresses caused at the interface between the panel fixing plate (447) and the holding frame (446) and at the interface between the panel fixing plate (447) and the cross-dichroic prism (444) are reduced, thereby preventing the liquid crystal panel (441) from being out of position.