Abstract: An optical apparatus includes a color synthesizing prism, a plurality of exit-side polarizer plates which are respectively arranged on the light entrance side faces of the color synthesizing prism through entrance-side heat conduction plates, a plurality of liquid-crystal display devices which are respectively arranged on the entrance sides of the plurality of exit-side polarizer plates, and a plurality of entrance-side polarizer plates which are respectively arranged on the entrance sides of the plurality of liquid-crystal display devices. The entrance-side heat conduction plate which is located in the optical path of colored light generating the largest quantity of heat can be arranged in heat insulation from the entrance-side heat conduction plates which are located in the optical paths of the other colored lights, and it can be joined to an armoring case through heat conduction members.

Abstract: A light source lamp unit (10) includes a light source lamp (11), an ellipsoidal reflector (12) and a plate body (19). The plate body (19) is provided behind the reflector (12) with a gap kept therebetween, which has a shape corresponding to the profile of a reflecting portion (122) of the reflector (12). A cooling channel for passing a cooling air is formed between the plate body (19) and the reflector (12). The width of the cooling channel in a direction along an optical axis of the light source lamp (11) is minimized at a part near a neck portion (121) of the reflecting portion (122) and enlarged toward the peripheral edge of the reflecting portion (122) of the reflector (12).

Abstract: An illumination apparatus comprises an illuminant which radiates diffused light from an outgoing plane and generates heat, a light guiding member configured to guide the diffused light from the illuminant while reflecting the diffused light at the internal surface thereof, and a holding member configured to integrally hold the illuminant and the light guiding member at a predetermined interval. The light guiding member includes an incident end which is close to the outgoing plane of the illuminant, and into which the diffused light is incident and which is larger than the outgoing plane of the illuminant, and an outgoing end which is larger than the incident end. The holding member includes a heat conducting portion configured to conduct the heat generated at the illuminant, and a heat radiating portion configured to radiate heat from the heat conducting portion.

Abstract: A color separation/combination optical system according to the present invention comprises of a polarization beam splitter which performs at least one of separation of illumination light from a light source into light components for a plurality of colors and combination of light components for modulated by a plurality of image display elements, a plurality of temperature varying units which are disposed in opposition to or in contact with different surfaces of the polarization beam splitter and change the temperature of the polarization beam splitter, a temperature sensor which detects the temperature of the polarization beam splitter. The system also includes a control circuit controls the temperature varying units based on the temperature detected by the temperature sensor to prevent the action of birefringence caused by internal stress in an optical glass material constituting the polarization beam splitter from hindering a desired action of polarized light separation.

Abstract: The present invention is a projection type projector apparatus which is provided with a light source portion, a light bulb and a cooler for cooling at least the light source portion, with a silencer which takes exhaust air from the cooler once to damp exhaust sound, and a mounting portion for attachably/detachably mounting the silencer to a projection type projector.

Abstract: A projector includes a first housing, a second housing, and a sound insulating member. The first housing is provided with first heat-generating elements used for generating an image, first fans producing cooling airflows towards each one of the first heat-generating elements, and vents via which the cooling airflows heated by the first heat-generating elements are discharged. The second housing encloses the first housing, and has second fans discharging the cooling airflows outside the projector. The sound insulating member is provided on a path between the vents and the second fans so as to insulate sound produced by the first fans. The projector may be provided with a dust-proof member for the projecting lens.

Abstract: A reflection type projector includes a light source, a polarization beam splitter for polarizing light emitted from the light source, a display device disposed next to the polarization beam splitter for forming an image, a projection lens unit for projecting an image reflected by the display device, a thermoelectric element installed such that the front surface thereof is in contact with the rear surface of the display device, a heat sink installed at the rear surface of the thermoelectric element, a heat pipe of which one end is connected to the heat sink, and a heat radiating plate connected to the other end of the heat pipe. Thus, the heat accumulated in the display device can be dissipated rapidly and with no noise, so that the projector can be operated more silently. Also, the life span of the display device is increased.

Abstract: A projector includes an enclosing structure that encloses an optical path from an electrooptical device to a projection lens with a heat insulating member, and a thermoelectric transducer for cooling air inside the enclosing structure. Since the enclosing structure is formed by the heat insulating member, the electrooptical device can be efficiently cooled while thermally blocking between the inside and the outside thereof. Since being enclosed, the entry of dust or oil mist from the outside is prevented, and dust or oil mist does not adhere to the electrooptical device and the like.

Abstract: A projector is provided that may include an enclosing structure for enclosing an optical path from an electro-optical apparatus to a projection lens, and an air circulation path connected to the enclosing structure and disposed in a flow path for cooling air. Thus, air inside the enclosing structure can be efficiently cooled while preventing the entry of dust or oil mist.

Abstract: The invention provides a projector capable of easily replacing and efficiently cooling a light source, and capable of facilitating a reduction in the size of the projector. An exhaust fan adjacent to a light source lamp is mounted to a replacement cover so as to be removed from the main body of the projector together with the replacement cover. For this reason, by only removing the replacement cover, the light source lamp can be easily attached and detached together with the replacement cover unit. In addition, since it is not necessary to separately secure a special space for sliding the replacement cover unit, other components except the exhaust fan can be disposed closely to the periphery of the unit, and the size of the projector can be further reduced. Furthermore, when the replacement cover is closed, the exhaust fan is positioned closer to the replacement cover unit, so that a light source device in the unit can be efficiently cooled.

Abstract: A projection type liquid crystal display apparatus comprises three light valves showing a same temperature level to eliminate color distortions at low cost without requiring a large space. Rays of light of R, G, and B from a light source are made to enter light valves of R, G and B respectively by way of reflector mirrors and field lenses for R, G and B and modulated by the light valves before they are combined to produce an image, which image is then projected onto a screen by means of a projection lens group. The liquid crystal light valves are connected with each other by way of a high thermal conductivity sheet member, which is held in contact with the rear surface of each of the liquid crystal light valves.

Abstract: A projecting head mechanism of a projecting machine adapted to project an image generated by a non-reflective document is disclosed. A thermo-conducting metal piece is installed in the projecting head mechanism and the internal surface area of a projecting mirror is coated with silicon compound for evenly and repidly distributing the heat generated by the light beam received by the projecting mirror over the surface area of the projecting mirror, so that the heat will not be concentrated on a spot to damage the projecting machine.

Abstract: A calculator (20) or other computing device uses a remote display (22) set upon an elevated platform (26) above the base (12) of an overhead projector (10). Light through the base lens (14) is passed through the display (22) and is enlarged by lens (30).

Abstract: A film transparency projector including a housing, a source of illumination for projecting light through a film transparency, a lens for focusing the image on a desired surface, an infrared filter for resisting passage of infrared radiation from the source of illumination to the film transparency, an ultraviolet filter for resisting passage of ultraviolet radiation from the source of illumination to the film transparency the ultraviolet filter including a filter member composed of an acrylic material having an ultraviolet absorbing additive and a vent for exhausting air from the housing. The infrared filter may consist of two angularly disposed spaced infrared filters. The ultraviolet absorbing material may be selected from the group consisting of benzophenones, benzotriazoles, substituted acrylonitriles and phenol-nickel complexes. The acrylic material may include methyl methacrylate.