A projection-type display apparatus in accordance with the invention reduces the margin formed around the image forming range of the light valves, and forms a bright projected image. Emitted light from a light source lamp unit of a projection-type display apparatus illuminates liquid crystal light valves of each color via an integrator optical system. First and second lens plates of an integrator optical system that serves as a uniform illuminating optical system are disposed such that the attac...

A projection type display apparatus is provided in which a polarizer is arranged on the light output side of the light valve. A stationary frame plate may be glued and fixed to a light incident surface of a dichroic prism of a projection type display apparatus. A frame plate holding a liquid-crystal light valve may be fastened to the stationary frame plate through an intermediate frame plate using screws. A light output side polarizer may be arranged inside an opening of the stationary frame pla...

An optical device includes four prisms joined into one body to combine light beams, a first type of multilayer coating being provided between joining surfaces of the four prisms, and a second type of multilayer coating being provided on at least one non-joining surface of the four right-angle prisms. Each prism bears the first type of multilayer coating and the second type of multilayer coating on two or less surfaces thereof. The optical device is further provided with liquid crystal image pane...

In a projector, wherein the polarized states of a plurality of color lights illuminating image forming means differ from the polarized states of image lights projected onto a projection surface and the image lights of respective colors projected onto the projection surface have a common polarized state, means for varying the polarized state is disposed in the optical path of each of the color lights.

A projection display device capable of improving cooling efficiency of the power unit includes a light source lamp unit, a projection lens unit, an exhaust fan provided near the light source lamp unit for ventilating an outer case, and a ventilating path provided inside the power unit. A suction fan is provided at the inlet of the ventilating path which is connected to the cooling air intake port through a duct cover to directly conduct fresh air into the ventilating path. Because the interior o...

In a projection display apparatus, an air inlet is formed below an optical modulation device and a color synthesizing system, and a suction fan is placed across the optical modulation device and the color synthesizing system. Thereby the optical modulation device and the color synthesizing system are uniformly cooled by air on the suction side of the suction fan. A structure fixing the optical modulation device and the color synthesizing system is provided with a suction opening cooling the opti...

A projection display device is provided that enables well-balanced cooling of a light modulator. A projection display device includes a head body having a surface for mounting a light modulator such as a liquid crystal light valve or the like thereon, and an air inlet for cooling the light modulator provided on the surface, the air inlet is formed to be enlarged on a side opposite to the spiral direction of cooling air sucked by an intake fan arranged below the air inlet and blown out. Therefore...

A projector for projecting a successive series of pictures and, in particular, an audiovisual information device, includes a housing, a projector disposed within the housing and a projection face which is provided in close proximity to the rear side of the housing for azimuthal projection. The projector face can be viewed by at least one window opening provided on the front side of the housing and the projector is arranged outside of the viewing range between the window opening and the projectio...

A projector for a film transparency having a first housing for enclosing an image transmitting system and a second housing having an open end through which the illumination from a projection bulb supported within the second housing is adapted to pass. The first and second housings are adjustably coupled to each other such that when they are located in juxtaposed position the illumination from the bulb is directed into the first housing so as to project an image of the transparency film along an ...

A motion picture projector in which projector mechanisms are incorporated in the body of a carrying case, the opening of which is covered by a panel structure on which a reel setting portion and an operation board are disposed. The panel structure is provided with a projection window through which a light beam from the projector mechanisms is projected. A cover attached to the case body by hinge means is provided in the inside thereof with a rear-projection screen assembly, which is adapted to e...