Abstract: A projection optical system which can project a bright image with less distortion and a small projection distance without causing aberration or an increase in size of reflective surfaces is disclosed. The projection optical system projects luminous flux from an original image onto a projection surface which is oblique to a central principal ray which is a principal ray of luminous flux traveling from the center of the original image to the center of a projected image. The projection optical system comprises a refractive optical system which includes a plurality of refractive optical elements through which the luminous flux from the original image passes through, and a reflective optical system which includes a plurality of reflective surfaces each having an optical power and guides the luminous flux emerging from the refractive optical system to the projection surface.

Abstract: An apparatus is provided which maintains alignment of panels in a projector. The apparatus includes a synthesizing system holding device positioned at an upper portion of a synthesizing system of the projector which securely supports the synthesizing system and maintains a relative position of various components of the synthesizing system, even in the event of an external force or vibration applied to the projector. This apparatus can prevent deviation or misalignment between at least two or more prisms and panels in the synthesizing system of the projector, thereby improving reliability and durability of the projector and enhancing image quality.

Abstract: A projector. A lamp serves as a light source for the projector. A starter turns on the lamp. An image processing system generates a projected image according to a video signal. A CPU controls the image processing system. A plurality of cooling fans positioned at least near the power supply, the lamp, or the image processing system to reduce the temperature around the cooling fans and respectively generating pulse signals corresponding to the rotational speed of the cooling fan. A charging circuit generates a continuous charging signal and generates a protection active signal to reset the CPU, shut down the power supply or the lamp.

Abstract: An automatic keystone correction which enables even an inexperienced user to easily obtain an image corrected using the keystone distortion during a tilted projection. The projector detects varying of its elevation angle by using an elevation detecting module. When the angle stops varying, the projector determines that the elevation adjustment by the user ends, and executes auto keystone correction of the input image according to the elevation angle.

Abstract: An adjustable color-temperature projecting device includes a light source for providing light beams, and a filtering means. The filtering means includes red, green and blue filtering sections. The blue filtering section has coatings with different transmissivitys. The intensity of blue primary color light is varied due to the different transmissivitys of the blue filtering section, so that the ratio of blue primary color light in the hybrid light is modified to cause change in color temperature with reduced loss of brightness. Then, the filtering means is moved so that the light beam is projected onto a predetermined location to obtain the desired color temperature.

Abstract: A system and method for identifying seats within a mobile platform such as an aircraft, bus, ship, train, etc. A sensor subsystem detects when a door of the mobile platform is opened and transmits a wireless signal to each one of a plurality of projector subsystems. Each of the projector subsystems are disposed adjacent an associated seat of the mobile platform. Each projector subsystem projects an enlarged, optical signal with seat identifying information onto the seatback of its associated seat.

Abstract: A projector 10 projects an image onto a set of screens 14 for image formation. The set of screens 14 includes a first screen 50 and second screens 54 and 56. The projector includes a housing 20, a first screen fixture 74 and a second screen fixture 76. The housing 20 has an opening 30 for fitting the first screen 50 therein. The first screen fixture 74 positions the first screen 50 in the housing opening 30 and fixes an inner surface of the first screen 50 adhesively to the housing 20. The second screen fixture 76 is positioned between the first screen 50 and the first screen fixture 74, and fixes the second screens 54 and 56 between itself and the inside of the first screen 50.

Abstract: A projector includes a light-source device, a discharge duct having an air intake port facing the light-source device and a discharge port, an axial fan mounted between the air intake port and the light-source device in an outer casing. The discharge port has an opening area smaller than that of the air intake port and is eccentric to the air intake port. The direction of air flow from the axial fan is inclined with respect to the direction of the discharge of a cooling air from the discharge port. Accordingly, when the cooling air that has cooled a light source lamp is discharged through the discharge duct with the axial fan, the light blocking effect can be increased and the discharge pressure of the cooling air discharged can be increased.

Abstract: An image display device used for an LCD projector provided with a periodic structure of pixels arranged in a matrix and a substrate supporting the pixels, modulating light entering from an entrance surface in pixel units, and emitting the same from an exit surface. A phase shift structure for randomly changing the phase of the light is formed on a surface of the substrate. The phase shift structure has a relief structure formed, for example, by etching the surface of the substrate through which light passes to random depths. Therefore, occurrence of high-order diffracted light caused by the periodic structure of very fine pixels is prevented, and accordingly the amount of 0th order light inherently required is increased.

Abstract: A display system includes a waveguide optical panel having an inlet face and an opposite outlet face. A projector and imaging device cooperate with the panel for projecting an image thereon. An optical detector is located near the panel for detecting a location on the outlet face of an inbound light spot. The inbound light is channeled to the detector which may be of a reduced size.

Abstract: A convection cooled liquid crystal display panel projector having a low wattage light source. The projector consist of a housing with a plurality of louvered vents preventing light from escaping from the housing while allowing air to circulate there through. A primary lens configuration having a light source, and a liquid crystal display panel, a Fresnel lens and a projector mirror. An overhead lens configuration by said light source and a Fresnel lens and liquid crystal display panel with a mirror in spaced relation thereto.

Abstract: An apparatus for displaying a stereoscopic virtual image to a first viewer (12a) and to a second viewer (12b), where the stereoscopic virtual image is imaged to each viewer at a left viewing pupil (14l) and a right viewing pupil (14r). Configurations using multiple beamsplitters (16) and one or two curved mirrors (24) direct the optical path to first and second viewers (12a and 12b).

Abstract: A projection type display device includes: a light source for emitting light including multiple light components falling within different wavelength ranges; pixels for modulating the light independently; a first optical system, which receives the light from the light source and directs it toward the pixels; and a second optical system, which projects the light, modulated by the pixels, onto a projection plane. The first optical system includes an optical element for converging the light components onto mutually different ones of the pixels in accordance with their wavelength ranges. The pixels are arranged in a predetermined azimuth on a panel plane where the pixels are defined. The element has a first length in a first direction defined by the azimuth and a second length, greater than the first length, in a second direction substantially perpendicular to the first direction. The element converges the light components in the first and second directions.

Abstract: A laser image projector includes a substrate; and a two dimensional array of individually addressable laser pixels formed on the substrate for emitting an imagewise beam of laser light perpendicular to the substrate, each of the laser pixels including an addressable organic light emitting diode (OLED) and an organic vertical cavity laser that is arranged to be pumped by the OLED.

Abstract: A projection type display device includes a light source, a picture information display element, and a light deflection device that deflects light from the light source and irradiates the deflected light on one region of the picture information display element. The light deflection device scans the deflected light over an entire area of the picture information display element and an area outside of an effective display area of the picture information display element.

Abstract: An improved real image projection system comprises, in the primary configuration, a tilted mirror to eliminate ghost reflections, and a unique arrangement allowing the introduction of a second background image without a 50%/50% beamsplitter, while providing system transmission of approximately 50%. A secondary configuration incorporates an elliptical or aspheric curved mirror designed to simulate the surface of a spherical curve when light strikes the elliptical surface at an angle equal to the elliptical angle of the curved mirror. In a third configuration, a single curved mirror has two different optical surfaces of revolution, one on the convex surface and one on the concave surface. The concave surface is much like that of a Mangin lens, but it has an aspheric surface of revolution, optimized to reduce spherical aberrations over a larger area offset from the optical axis.

Abstract: A three-dimensional imaging method and system illuminates an object to be imaged with a light pattern that is formed from two or more light sub-patterns. The sub-patterns can each encompass the visible light spectrum or can be spatially varying intensity sub-patterns that each correspond to a red, green, or blue component. The light pattern is generated by a slotted planar member or an optical filter.

Abstract: A projector has an image generating device for generating an image, and a housing, having the image generating device disposed therein and having an opening defined therein for emitting therethrough projection light representing the image from the image generating device. A projection mirror is mounted on an outer surface of the housing for reflecting the projection light to project the image onto a projection surface. An optical system is disposed in the opening for applying the projection light to the projection mirror. The projector also has a foreign matter detector for detecting foreign matter which enters a light path of the projection light between the optical system and the projection mirror.

Abstract: A small-scale communication and/or data processing apparatus with an indicating device, integrated in the apparatus, which has an image projector.

Abstract: In a method and apparatus for detecting small periodic wave patterns in technical surfaces, monochromatic coherent primary light is directed onto a workpiece surface approximately at right angles to the expected periodic wave patterns, and at an angle of incidence that grazes the workpiece surface, creating a diffraction image of the waved surface structure in the secondary-light beam. The occurrence of two intensity maxima immediately indicates the presence of a periodic wave pattern, whose period is evaluated through inverse proportionality from the spacing of neighboring intensity maxima, while the depth of the wave troughs is determined from the intensity of neighboring intensity maxima and from the period. The intensity distribution in the diffraction image in the secondary-beam path is subjected to an autocorrelation, and both the period and the depth of the wave pattern can be calculated from the autocorrelation function.