Abstract: The projection apparatus includes a light source, optical elements and a heat dissipation assembly. The heat dissipation assembly includes a case, a heat dissipation element, a fan and a temperature controlling unit. The optical elements transmit a light beam generated by the light source, and thereby generate heat. The heat dissipation assembly is adapted for heat dissipation correspondingly. In the heat dissipation assembly, the case protects the optical elements from being polluted by the dust during heat dissipation. The temperature controlling unit senses the surrounding temperature to control the fan for cooling the heat dissipation element, and the durability of the optical elements are thereby enhanced.

Abstract: A light source includes an arc tube having a light emission portion for emitting light. A reflector reflects the light toward an illumination receiving area with the arc tube fixed to the reflector. A housing houses the reflector to form a space through which cooling air flows. The housing has three delivery ports disposed side by side as ports from each of which the cooling air is delivered toward the direction of the light emission portion. A first delivery port included in the three delivery ports is located such that the center of the first delivery port is disposed substantially at a position aligned and runs parallel to the optical axis of the arc tube. Second and third delivery ports included in the three delivery ports are disposed in the vicinity of one and the other sides of a first delivery port, respectively, with respect to the optical axis.

Abstract: An apparatus comprising a visible light source(s), multimode optical fiber(s), light coupler(s), an optional spatial light modulator(s), and an optional projection lens(es). The light source has a 1/e half-width emission bandwidth. The light coupler couples the light source to the multimode optical fiber(s) such that objective speckle contrast is reduced. The multimode optical fiber(s) may pass light from the coupler to an optional spatial light modulator. The spatial light modulator may modulate the light to form an image. The projection lens may transfer light onto an image plane or to illuminate objects. The objective speckle contrast at the end of the multimode fiber in combination with the projection lens diameter (if employed) and wavelength diversity may result in viewed images at the viewer's eye, or other detector, exhibiting speckle contrast that may be 1% or less.

Abstract: A projector includes a case, an optical engine, a heat sink, a circuit board, and a fan. The case includes two sidewalls, and each sidewall defines an air hole. The optical engine is received in the case. The heat sink is positioned on the optical engine. The circuit board is positioned between the heat sink and one of the sidewalls. The fan is received in the case. The air holes of the two sidewalls and the fan form a dissipating passage. The heat sink and the circuit board are positioned in the dissipating passage.

Abstract: A relay lens system is provided. The relay lens system comprises: an air-spaced doublet comprising: a biconvex lens and a negative meniscus lens, an optical axis of the air-spaced doublet offset between the biconvex lens and the negative meniscus lens, each of the biconvex lens, the negative meniscus lens, an air space there between and an offset of the optical axis there between are selected to adjust the coma in an image travelling there through; and, a pair of cylindrical lenses, cylindrical with a relay optical path through the system, each of the pair of cylindrical lenses, and a respective air space there between, selected to adjust the astigmatism in the image.

Abstract: A projection device includes a main body, a light source, a light valve, and a lens module. The light source produces an illumination beam. The light valve converts the illumination beam into an image beam. The lens module disposed at the main body includes a lens barrel and a lens. The lens barrel has an inner wall, a containing space and a riveting portion. The inner wall surrounds the containing space. The riveting portion is located in the containing space. There is a gap between the riveting portion and the inner wall. The lens disposed in the containing space has a light emitting surface and a side surface. The side surface leans against the riveting portion. An end of the riveting portion extends to the light emitting surface to limit the lens in the containing space The image beam passes through the lens to form a projection beam.

Abstract: A liquid crystal projector which prevents deterioration of the aluminum grid inorganic polarizing plate due to dust in the cooling air for cooling the liquid crystal panel module. A shade member along the surface of the inorganic polarizing plate prevents the surface from being directly hit by the cooling wind and thus prevents dust from attaching to the surface of the plate.

Abstract: A projector includes a discharge lamp, a discharge-lamp driving unit, a control unit, a light modulating element, and a projection optical system. The control unit alternately repeats a high luminance period in which a driving current having a relatively large absolute value is supplied to the discharge lamp and a low luminance period in which the driving current having a relatively small absolute value is supplied to the discharge lamp. The control unit controls the discharge-lamp driving unit according to a driving current waveform formed by the control waveform unit including a direct-current waveform pattern in which the driving current in a first high luminance period, the driving current in a first low luminance period immediately after the first high luminance period, and the driving current in a second high luminance period immediately after the first low luminance period have the same first polarity.

Abstract: A light emitting device includes a substrate, a laminated body formed by stacking a first cladding layer, a first active layer, a second cladding layer, a third cladding layer, a second active layer, and a fourth cladding layer on the substrate in this order, a first electrode connected to the first cladding layer, a second electrode connected to the second cladding layer and the third cladding layer, and a third electrode connected to the fourth cladding layer, the first active layer generates first light using the first electrode and the second electrode, the second active layer generates second light using the second electrode and the third electrode, and a side surface of the first active layer is provided with an emitting section for emitting the first light, and a side surface of the second active layer is provided with an emitting section for emitting the second light.

Abstract: An optical element that can reduce the etendue of emitted light emitted from the optical element without having depend on the etendue of light-emitting elements is provided with a plasmon-excitation layer that is interposed between two layers having dielectric properties wherein, taking the plasmon-excitation layer as a border, the effective dielectric constant of the emission-side portion that is the emission layer side is higher than the effective dielectric constant of the incident-side portion that is the side of a carrier-generating layer, and the dielectric constant between the plasmon-excitation layer and the carrier-generating layer is higher than the dielectric constant between the carrier-generating layer and the light-incident surface.

Abstract: A light emitting device includes a first layer that generates light by an injection current, the first layer is provided with a first optical waveguide extending from a first light emitting section disposed on a first side surface to a first light reflecting section disposed on a second side surface, a second optical waveguide extending from the first light reflecting section to a second light reflecting section disposed on a third side surface, and a third optical waveguide extending from the second light reflecting section to a second light emitting section disposed on the first side surface, and an element of the group II or the group XII is diffused in the first light reflecting section and the second light reflecting section.

Abstract: The projection device includes an image-forming system and the illumination system. The illumination system includes a first light source device, a second light source device and a first light guiding device. The first light source device generates a visible light, while the second light source device directly generates a substantially pure infrared light. The light guiding device is adapted to guide the visible light and the infrared light to the image-forming system for processing to make the visible light form a visible light image and make the infrared light form an infrared light image.

Abstract: A projection apparatus includes a light source module and a micro-electro-mechanical-system (MEMS) mirror. The light source module outputs a plurality of illumination beams having different transmission paths. The MEMS mirror is disposed on the transmission paths of the illumination beams. Each illumination beam propagates to the MEMS mirror respectively, and the illumination beams are respectively reflected by the MEMS mirror to project on a plurality of positions within an imaging region, wherein the transmission paths of the illumination beams transmitted from the light source to the MEMS mirror are not intersected with the imaging region.

Abstract: In a personal interactive overhead projection IFE system, an overhead projector associated with a passenger's seat projects video onto a passive substrate attached to the seat. The passive substrate may be a tray table or a dedicated video projection screen. The passenger sitting in the seat controls the projected video by positioning his or her finger or making hand gestures proximate the passive substrate. An overhead camera records the hand actions. An overhead processor interprets the hand actions and controls the projected video based on the hand actions. The system provides highly desirable personal and interactive features while obviating the need for seatback video display units or passenger control units.

Abstract: A display includes a light source, a first color wheel, a second color wheel, an actuator, a controller, and a light modulator. The light source is for providing a light beam. The first color wheel includes plural primary-color filtering areas, and the second color wheel includes plural left or right eye filtering areas. The actuator rotates the first color wheel and the second color wheel. The controller is for controlling the rotations of the first color wheel and the second color wheel, such that the light beam passing through the first color wheel and the second color wheel is filtered to plural left or right eye primary-color light beams with different spectra. The light modulator is for modulating the left or right primary-color light beams and projecting the modulated left or right primary-color light beams onto a screen to display an image.

Abstract: A light-emitting device includes: a semiconductor light-emitting element which emits light of a first wavelength; and a first wavelength conversion unit which includes a first phosphor and emits light of a second wavelength by being excited by the light of the first wavelength. The first phosphor contains europium as an activator. The light of the first wavelength is emitted to the first wavelength conversion unit at 1 kW/cm2 or greater. 1??12/?11?1.17 is satisfied where ?1 is light output ratio of the light of the first wavelength to the light of the second wavelength, ?11 is light output ratio obtained when the light of the first wavelength is emitted to the first wavelength conversion unit at 5 kW/cm2, and ?12 is light output ratio obtained when the light of the first wavelength is emitted to the first wavelength conversion unit at 2.5 kW/cm2.

Abstract: The shield includes: a first dust-proof wall that is shiftable integrally with the projection lens, and has width a1 projecting from the projection lens to an A side; and a second dust-proof wall that is slidable within a range regulated by the regulator, and has length b1 on the A side. When the second dust-proof wall has length c2 shiftable to a B side, the projection lens and the second dust-proof wall form a space having length d1 on the A side, and the projection lens and the frame form a space having length e1 on the A side, a1?d1, b1?e1?d1, and b1+d1?e1?c2 are satisfied.

Abstract: The disclosure generally relates to refractive polarization converters, polarized color combiners using the refractive polarization converters, and in particular polarized color combiners using the refractive polarization converters that can be useful in small size format projectors such as pocket projectors. The disclosed refractive polarization converters include at least one birefringent prism that can separate an unpolarized light beam into divergent polarized light beams having orthogonal polarization directions.

Abstract: An optical system has projector optics aligned on a projection axis that is orthogonal to an offset axis. A first laser is positioned in a first plane orthogonal to the projection axis. First folding optics are positioned in the first plane to fold a first beam from the first laser to a first portion of the projector optics. A second laser is in a second plane parallel to, and offset along the offset axis from, the first plane. Second folding optics is positioned in the second plane to fold a second beam from the second laser to a second portion of the projector optics to synthesize the first and second beam.

Abstract: A projector may include an imaging unit, a positional-information generating unit, and a projecting unit. The imaging unit picks up an image of a projection target area with light in a first wavelength band and generates a first pickup image and picks up an image of the projection target area with light in a second wavelength band and generates a second pickup image. The positional-information generating unit generates, on a basis of the first pickup image, adjustment data for performing adjustment of positional information indicating a position of indication light and generates, on a basis of the second pickup image, the positional information. The projecting unit projects an image based on the positional information.