Abstract: A projection display device for enlarging and projecting an image includes a first lens group on the enlarging end of the projection display device, a plurality of display elements, each modulating a different one of a plurality of light beams with image information, an optical combiner for receiving from different directions different light beams modulated by different display elements, combining the modulated light beams, and directing the combined modulated light beams along an optical axis to the first lens group, and a plurality of second lens groups, each arranged on a separate optical axis so that a different one of the modulated light beams modulated by a different display element on the separate optical axis passes through one of the second lens groups before being incident on the optical combiner. The projection optical device satisfies certain conditions related to focal lengths and size of the display elements.

Abstract: A projector has a distortion correcting circuit for correcting a distorted quadrangular projected image, which is projected onto a projection surface along a projection optical axis inclined in at least one of leftward, rightward, upward, and downward directions, into a rectangular corrected image, such that one of the vertexes B, D on the opposite ends of either one of two diagonal lines of the rectangular corrected image is positioned on one side La of the outer edge of a projection range of the projected image and the other vertex on another side Lb that is positioned adjacent to the one side La.

Abstract: An outer suspension type lens shielding mask for a projection apparatus including a sheet body and holding element, in which a rectangular hole is opened in the sheet body, and the sheet body is combined with the holding element to be fixed on a projection apparatus. Another outer suspension type lens shielding mask includes a base plate, in which a rectangular hole is opened in the middle part thereof, and upper and lower adjustable plates are installed behind the base plate. An open rectangular notch is respectively disposed at the middle parts of the upper and the lower adjustable plates. An adjustment mechanism includes a plurality of connecting elements connected to the base plate and the upper and the lower adjustable plates for adjusting the relative positions thereof, to avoid bad shadows yielded outside of a picture due to light diffraction and improve the quality of visual amusement.

Abstract: A projector including an illumination device, an electra-optic modulator and a projection optical system. The illumination device is provided with a light source that emits a substantially parallel luminous flux to the side of a region to be illuminated; a first lens array including a plurality of first small lenses; a second lens array including a plurality of second small lenses corresponding to the first lens array; and a superimposing lens that superimposes the partial luminous fluxes coming from the second lens array. The projector further including a light shielding member provided with a stray light elimination member disposed to be substantially optically conjugate with the plurality of first small lenses and the electro-optic modulator for adjusting the cross-section shape of the luminous flux; and a rotating prism for scanning the luminous flux from the light shelding member in synchronization with a frame rate of the electro-optic modulator.

Abstract: An image displaying apparatus employs quartz wave plates and displays images of high contrast. The quartz wave plates in the image displaying apparatus are each arranged between a polarizing beam splitter of a color separating-combining unit and a reflective spatial light modulator. Each of the quartz wave plates is made of two elementary quartz plates. An angle formed between slow axes of the two elemental quartz plates is within a range of 5 minutes to 15 minutes from a right angle.

Abstract: An apparatus including a spatially modulated extended light source configured to project an output having at least one region of diminished illumination, and an array of polarizing beam splitters (PBSs) positioned proximal to the spatially modulated extended light source. The light source includes at least two light outputs configured to project unpolarized light; and at least one gap interspersed between the light outputs. The array of PBSs is configured to receive the output from the light source, convert the unpolarized light to light having a first polarized state, and remove the at least one region of diminished illumination.

Abstract: An optical device (44) includes: a optical modulator holder (4402) that has inside thereof a cooling chamber in which a cooling fluid is encapsulated, and holds a optical modulator in such a manner that heat can be transferred between the optical modulator holder and the cooling fluid within the cooling chamber; a plurality of fluid circulation members (448) that are connected to the cooling chamber of the optical modulator holder (4402) for mutual communication to guide the cooling fluid outside the cooling chamber and guide the cooling fluid inside the cooling chamber, again; and a main tank (445) that is arranged in the flow path of the cooling fluid in the plurality of fluid circulation members (448) and accumulates the cooling fluid. The main tank (445) has a cooling fluid inlet section for allowing the main tank (445) to be replenished with the cooling fluid.

Abstract: A wall hanging apparatus for a projection apparatus comprises a fixing seat installed at the lower surface of the projection apparatus, supporting arm whose lower end is fixed on the surface of the fixing seat and reflection mirror fixed at the upper end of the supporting arm and corresponded to a projection lens of the projection apparatus. Whereby, the projection apparatus can have both the portability of a prone type projection apparatus and space saving characteristic of a ceiling hanging type projection apparatus and can be used in an indoor space with a lower height to allow the usage of the projection apparatus is diversified. And, a trapezoid deformation of an image caused from the deviation of the angle of incidence can be modified effectively and quickly by adjusting the angle of the reflection mirror.

Abstract: A transmission screen includes a Fresnel lens sheet through which light is projected from a projector to a lenticular lens sheet arranged on a viewer side, as approximately parallel light, and the lenticular lens sheet receiving light passing through the Fresnel lens sheet, and emitting the approximately parallel light while horizontally widening, by means of a group of cylindrical lenses which are horizontally in parallel, wherein in at least one of the Fresnel lens sheet and the lenticular lens sheet, on a surface of a light diffusing substrate, in which a light diffusing material is dispersed, irregularities which constitute a lens section is formed, and in the light diffusing substrate, dispersion density of the light diffusing material differs in at least two layers in the thickness direction.

Abstract: Disclosed is a reflection-type micro display projection system having a polarization beam splitter with an optimized structure. The reflection-type micro display projection system includes a light source, an optical system, a reflection-type liquid crystal display panel, a projection lens, and a screen. When the incident angle of the light beam, which is output from an illumination lens of the optical system and input to a polarization beam splitter on the basis of the normal of the boundary face of the polarization beam splitter, is ?, the refractive angle of the light beam refracted inside the polarization beam splitter is ?, and the refractive index of the polarization beam splitter is n, n×sin ?=sin ?. The refractive index n is larger than 1.6 and smaller than 2.0. The refractive angle ? is smaller than 75°.

Abstract: A heat-conductive frame (448) is provided extending between a holder frame (446) and a fixing member (447) of an optical device (44). Additionally, a heat-conductive member (450) is provided, which abuts on a dust-proof glass on the light-irradiation side of a liquid crystal panel (440) and the fixing member (447). The holder frame (446) and the fixing member (447) are fixed by a heat-conductive agglutinate. Besides, a heat-conductive member (452) is attached extending between a light-irradiation surface of a transparent member (443A) of an irradiation-side polarization plate (443) and the fixing member (447). A heat-radiation fin (449) having a plurality of fin members (449B) is attached to an upper plate body (447C) of the fixing member (447).

Abstract: An illumination apparatus comprises a small-plane light source having diffusion radiation characteristics, a columnar light leading member, having an incident end surface, an outgoing radiation end surface and a reflection surface, configured to reflect on the reflection surface at least a part of a light ray from the small-plane light source collected from the incident end surface, thereby leading the light to the outgoing radiation end surface, and an angle position converting member configured to convert an outgoing light angle intensity of the outgoing light from the outgoing radiation end surface of the columnar light leading member into a position intensity in a predetermined irradiation area.

Abstract: A projector capable of obtaining a smooth motion picture display of high quality without significantly reducing the utilization efficiency of light includes a light source device, a first lens array, a second lens array, a superimposing lens, a liquid crystal display device, and a projective optical system. The superimposing lens includes an anamorphic optical system to shape illumination luminous fluxes from the second lens array into illumination luminous fluxes having a cross-sectional shape that illuminates all the image formation regions of the liquid crystal display device in one direction along an X-axis direction, and a part of the image formation regions in the other direction along a Y-axis direction. The projector further includes a scanning device to scan the illumination luminous fluxes shaped by the superimposing lens in synchronism with a field frequency of the liquid crystal display device along the other direction on the image formation region.

Abstract: An elevator assembly for use with a projection device is provided. In one embodiment, the elevator assembly may include a foot extension configured to contact a reference surface, and a substantially planar one-piece bracket configured to support the foot extension and slidibly couple the foot extension with a housing of the projection device, wherein the bracket enables the foot extension to extend and refract relative to the housing of the projection device. In some embodiments, the bracket may be configured to slidably couple the foot extension with the housing via a snap fit connection.

Abstract: In a computing device, a method of updating over a network a set of executable instructions stored on an image-rendering device is disclosed, wherein the image-rendering device is operably associated with a projection device. The method includes detecting a version of the set of executable instructions on the image-rendering device, and sending an updated set of the executable instructions to the image-rendering device over the network.

Abstract: A lens cover set, used with a lens disposed on an electronic product, includes a lens cover and a lens jacket. The lens cover is disposed on a housing of the electronic product and is used for containing the lens. The lens jacket is installed on the lens cover adjustably and hoops the lens by leaving a gap. By way of adjusting a relative position between the lens jacket and the lens cover so that the gap can be modulated.

Abstract: An illumination system includes a first light source, a second light source, a first light integrating device and a second light integrating device. Each light integrating device includes an input aperture at an input end for receiving input light and a turning mirror at an output end for reflecting light onto an output aperture where the output aperture is positioned in a direction perpendicular to the input aperture. The illumination system further includes a first reflective mirror and a second reflective mirror each coupled to direct light from the respective light source into the input aperture of the respective light integrating device. The illumination system includes a third light integrating device including an input aperture optically coupled to the output apertures of the first and second light integrating devices. The input aperture of the third light integrating device receives light collected by the first and second light integrating devices.

Abstract: A projection display device is provided. The projection display device may include an image generation device configured to generate an image and a wide angle lens system having an optical axis configured to receive the image and project the image along an optical path for display above the display device. The projection display device further may include direction changing optics configured to fold the optical path such that the optical path changes direction from a first direction to a second direction. In some embodiments, the image generation device may be positioned below the optical axis of the wide angle lens system.

Abstract: An electronic apparatus including a first tube system (641) that guides the cooling medium from the cooling medium storage section (62) to the components to be cooled; a second tube system (642) that sends back the cooling medium having been used for cooling the components to be cooled to the cooling medium storage section (62); and a medium circulator (63) that is disposed on the first tube system (641) or second (642) in order to circulate the cooling medium through the cooling medium storage section (62), first tube system (641), and second tube system (642). Tube joints (6412) (6422) that is exposed to the outside of the casing (2), to which a cooling medium replacement cartridge (7) used for replacing the cooling medium in the cooling medium storage section with a new cooling medium is connected are provided in the first tube system (641) and/or second tube system.

Abstract: A doughnut-shaped dust-proof plate is externally fitted in the body of the projection lens. The dust-proof plate comprises a first member which is flexible like rubber and a second member made of plastic which is uneasy to deform. The second member is made lower in a vertical direction (lengthwise) than the first member, thereby making it possible to allow deformation at an upper end and a lower end of the first member. On the other hand, the second member is made long in a horizontal direction (crosswise). A longitudinal portion of the second member is set to have such a length that it can come into contact with an upper or lower wall of the frame of the liquid crystal projector even if the projection lens is positioned at the lowermost or uppermost position, respectively.