Patent ID: 7073912
Filing Date: 2006-07-11
Classification: G03B,H04N

Abstract:
1. An optical parts casing for housing optical parts including a plurality of optical modulator devices that modulate a plurality of color lights in response to image information for every color light, the optical parts housed inside the casing and arranged at predetermined positions on an illumination optical-axis of a luminous flux emitted from a light source comprising: a thermal-conductive outer surface portion that the optical parts contact; and ribs provided upright on the outer surface portion to constitute ducts that guide a cooling fluid to cool the plurality of optical modulator devices, and holes formed in the outer surface portion to guide the cooling fluid from the ducts to the optical modulator devices in the optical parts casing; the ribs including a rib to define a first passage that guides cooling fluid introduced from cooling-fluid introducing opening ports of the ducts to one optical modulator device that modulates a color light having a smaller intensity of light of the plurality of color lights, and a rib to define a second passage that guides the cooling fluid introduced from the opening ports to other optical modulator devices and surrounds at least a peripheral portion of each of the other optical modulator devices, the rib defining the first passage and the rib defining the second passage being formed such that the first passage completely surrounds the peripheral portions of the second passage along the outer surface portion of the optical parts casing, and the cooling fluid passing through the first passage cools the outer surface portion.