Abstract: An illumination device comprising a first light source generating first light beam having a first spectral distribution and a second light source generating a second light beam having a second spectral distribution. A first dichroic reflector is positioned in the first light beam and transmits a part of the first light beam and reflects a part of the second light beam. The first and second light beam propagates initially primarily in a first direction along an optical axis and reflecting means reflects the second light beam towards the dichroic reflector. The light sources, the dichroic reflector and reflecting means are mutually arranged such that the second light beam propagates primarily in a second direction substantially opposite the first direction and towards the first light source after being reflected by the reflecting means and such that the second light beam propagates substantial in the first direction after being reflected by the dichroic reflector.

Abstract: An illumination device a first light source array a first light source. The first light source can generate a first light beam having a first spectral distribution. The first light beam can propagate primarily in a first direction along an optical axis. A second light source array can be included, having a second light source that generates a second light beam having a second spectral distribution. Also included can be a first dichroic reflector positioned partially in the first and the second light beams. The first dichroic reflector can transmit a part of the first and the second light beams. The second light beam can propagate in a second direction towards a part of the first light source array and opposite the first direction. Further, a part of the second light beam can propagate primarily in first direction after being reflected by the first dichroic reflector.

Abstract: The polarization beam splitting element includes a one-dimensional grating structure having a grating period smaller than a wavelength of an entering beam and including a metal grating portion, and two light-transmissive members each having a refractive index higher than that of air. The one-dimensional grating structure is disposed between the two light-transmissive members. The grating period of the one-dimensional grating structure is 120 nm or less, a thickness of the one-dimensional grating structure is 100 nm or less and an inter-grating portion of the one-dimensional grating structure is formed as a vacuum space or formed of air or a dielectric material. The grating period ? [nm], a filling factor FF that is a ratio w/? of a width w [nm] of the grating portion to the grating period, a refractive index na of the inter-grating portion and a wavelength ?g of 550 [nm] satisfy (1.4na?2.9)?/?g?0.57na+1.32?FF?(1.4na?2.9)?/?g?0.57na+1.39 and 0.152np?1.375(?/?g)+0.5?FF?0.152np?1.375(?/?g)+0.6.

Abstract: An illuminating optical system includes: a substantially rectangular-shaped light source that includes a light emitting surface with a split pattern formed thereat by a splitting line, the splitting line extending along a predetermined direction and splitting the light emitting surface into a plurality of separate areas; an illumination-target member that includes a rectangular radiation-target area; and an optical member in that condenses light departing the light emitting surface and radiates the condensed light toward the radiation-target area, wherein: an extent of uneven illumination attributable to an image of the split pattern at the light emitting surface of the light source, formed at the illumination-target member, is reduced.

Abstract: The image projection apparatus is disclosed to which plural interchangeable optical units are selectively attachable. The apparatus includes a shift mechanism moving an attached optical unit, which is one of the plural interchangeable optical units that is attached to the apparatus, with respect to a light modulation element in a direction orthogonal to an optical axis, an actuator driving the shift mechanism, and a controller controlling drive of the actuator using a control parameter for moving the attached optical unit by a specific movement amount via the shift mechanism. The controller acquires information on at least one of a weight and an optical characteristic of the attached optical unit from a memory provided in one of the apparatus and the attached optical unit, and to change the control parameter using the acquired information.

Abstract: A light source device includes: light sources arranged in a plane; collimator lenses disposed in the vicinities of corresponding each of the light sources, each of the collimator lenses collimating a light beam emitted from the corresponding light source, and a holder that holds the light sources and the collimator lenses. The holder holds the light sources and the collimator lenses so that optical axes of the collimator lenses are respectively shifted parallel to optical axes of the light sources by shift lengths that are set so that light beams emitted from the light sources via the collimator lenses are focused on a certain region of an illumination subject body. The light beams emitted from the light sources are refracted by the collimator lenses and focused on the certain region.

Abstract: An optical system having a plane anisotropic retroreflector portion which specularly reflects radiation components in a first plane of incidence, but retroreflects radiation components in a second plane of incidence, a first imaging portion which produces on the retroreflector portion a line-shaped intermediate image of an object point in an object plane in a specified position relative to the system, the image extending along a line in the second plane of incidence, and a second imaging portion by means of which the line-shaped intermediate image is imaged into an image point.

Abstract: A light field display apparatus includes a plurality of projectors to emit rays, and a screen to display the rays emitted by the plurality of projectors. Positions of the plurality of projectors may be controlled so that intervals or angles between the rays displayed on the screen are substantially the same.

Abstract: A projection system having a first tilting mirror matrix, a second tilting mirror matrix, and an imaging lens, which projects the first tilting mirror matrix onto the second tilting mirror matrix, wherein each tilting mirror matrix has multiple tilting mirrors, the tilting axes of which are positioned in a modulator surface plane. The imaging lens includes a first lens and an imaging mirror, and the imaging mirror forms an aperture stop of the imaging lens, wherein the aperture diaphragm includes an angle of other than 90° with the normal of the modulator surface of the first tilting mirror matrix without taking into account any optical path folds.

Abstract: According to the present invention, there is provided an optical device comprising, a plurality of light sources each operable to provide a light beam; at least one beam combiner which is operable to combine the light beams from the plurality of light sources, to provide a combined light beam; a beam splitter, which is arranged to receive the combined light beam and to split the combined light beam into a primary light beam and a secondary light beam, wherein one or more characteristics of the secondary light beam are indicative of one or more characteristics of the primary light beam, wherein the beam splitter comprises a first surface through which the primary light beam is emitted from the beam splitter and a second surface through which the secondary light beam is emitted from the beam splitter; a mirror component which comprises a mirror, wherein the mirror component is arranged such that the mirror can reflect the primary light beam which is emitted through the first surface of the beam splitter and whe

Abstract: A safe, highly bright projector is to be implemented. A projector directs a light beam from a light source (101) to an image modulating device (105), and magnifies and projects an image formed at the image modulating device (105) through a zoom lens (102). This projector has a light transmitting window (103) movably disposed in front of the surface of the light outgoing side of the zoom lens (102) along the optical axis. The projector further has a window position control unit (108) to control the position of the light transmitting window (103) so as not to change the light beam region that appears on the outer surface of the light transmitting window (103) as the focal length of the zoom lens (102) is varied.

Abstract: There is provided a projection image display apparatus which is excellent in quality of a display screen image even if a projection lens using a plastic lens having an asymmetrical shape with respect to an optical axis is used. The apparatus includes a projection lens which obliquely projects video light on a screen, an integrator which aligns a polarization direction of light from a light source, and an image display element (P, PL) which modulates light having the aligned polarization direction by an image signal. The projection lens includes multiple plastic lenses, and each of the multiple plastic lenses is arrayed, respectively, by shifting a gate direction to each other by 180 degrees. When the projection lens includes n sheets (n is a natural number) of plastic lenses, each of the multiple plastic lenses may be arrayed, respectively, by shifting a gate direction to each other by (360/n) degrees.

Abstract: A video display device includes a light guide unit for guiding outgoing light from a light source unit to a pixel area of a display device. The light guide unit includes a rod integrator having an input opening through which the outgoing light from the light source unit enters and an output opening provided on a side opposite to the input opening, and a light shielding plate provided between the input opening of the rod integrator and the light source unit. The light shielding plate has a plurality of types of openings for passing the outgoing light from the light source unit to the rod integrator. The light shielding plate is arranged in a state where one of the plurality of types of openings, which has a shape similar to that of the input opening of the rod integrator which is actually mounted, is aligned with the input opening.

Abstract: An illumination light generation apparatus includes a light source unit and an emission unit. The light source unit includes first and second light source groups that radiate a plurality of light beams, respectively. The first and second light source groups face each other. The emission unit emits a composite light beam in a predetermined direction and includes a first reflection part that reflects the plurality of light beams radiated from the first light source group, and an emission part that reflects the plurality of light beams reflected from the first reflection part and the plurality of light beams radiated from the second light source group. The emission part generates the composite light beam by reflecting the plurality of light beams radiated from the first light source group and the plurality of light beams radiated from the second light source group in the predetermined direction.

Abstract: A light emitting device includes: a first light emission element which emits a first light; a second light emission element which emits a second light; a first reflection surface which reflects the first light; and a second reflection surface which reflects the second light, wherein the first light emission element and the second light emission element are laminated in a first direction and disposed in such positions that the emission direction of the first light and the emission direction of the second light become parallel with each other and that the first light emission element and the second light emission element do not overlap with each other as viewed in the first direction, and the traveling direction of the first light reflected by the first reflection surface and the traveling direction of the second light reflected by the second reflection surface become parallel with each other.

Abstract: A projection image display apparatus includes: a light source; an illumination optical system that uniformly irradiates a surface of an image modulation element serving as a primary image surface with a light beam emitted from the light source; and a projection optical system that enlarges and projects image information on the primary image surface modulated by the image modulation element onto a screen serving as a secondary image surface, and that includes a first optical system that forms an intermediate image from the image information, a single-image second optical system that enlarges and projects the intermediate image to display a single image on the screen, a plural-image second optical system that enlarges and projects the intermediate image to display plural images on the screen, and an optical path switching mechanism that selectively guides a light beam from the first optical system to the single-image or plural-image second optical system.

Abstract: A light source apparatus includes a first reflector having a first reflection face; a second reflector having a second reflection face, the first reflection face of the first reflector and the second reflection face of the second reflector disposed opposite each other; and a plurality of light sources being disposed around a periphery of the second reflector. Light beams emitted from the plurality of light sources reflect on the first reflector and then reflect on the second reflector.

Abstract: There is provided a projection apparatus using an oblique projection optical system, which generates little reflection loss by providing a linear Fresnel lens at an incident surface in the case where the apparatus is used as a linear system, wherein said linear Fresnel lens makes total reflection of image light, and is capable of obtaining total surface property with good brightness in a region with small incident angle onto a screen, by using a total reflection Fresnel lens and a refraction Fresnel lens in combination. In addition, total surface property with further good brightness can be obtained by using a plurality of projection image display apparatuses in the same projection apparatus.

Abstract: A mirror actuator system is provided for aligning images projected onto a curved screen by dual projectors. According to a preferred embodiment, a unique screw mechanism is provided for selectively slightly warping the mirror. The screw mechanism includes a load spreader in contact with the mirror, having a groove for receiving an screw actuator for applying positive or negative pressure to the load spreader and thereby to a local area (i.e. zone) of the mirror. The actuator system of the present invention provides low cost static pressure adjustment to the mirror for maintaining the focus quality while locally modifying the geometric ‘aim’ of the mirror. The groove in the load spreader provides tolerance to prevent thermal coefficient of expansion (TCE) distortion.

Abstract: A control device that controls a video signal to be input to a display device and controls the luminance of a light source that causes light to be incident on the display device includes: a light source luminance control section that controls the luminance of the light source by means of a light source luminance control signal; a storage section that stores relationships between light source luminance control signals and video correction amounts; a video correction signal generating section that generates, on the basis of the video correction amount that is stored in the storage section and corresponds to the generated light source luminance control signal, a video correction signal that is used to correct the video signal; and a video signal correcting section that corrects the video signal by means of the video correction signal.

Abstract: A method of accomplishing high-speed intensity variation of a polarized output laser beam includes securing an angle of light incidence sensitive optical element to a galvanometer system that provides high-speed transitioning of the angle of light incidence sensitive optical element between different angular positions. The high-speed transitioning provided by the galvanometer system varies an angle of incidence between an input laser beam and the angle of light incidence sensitive optical element to thereby provide high-speed variation of an intensity of a polarized output laser beam produced by the angle of light incidence sensitive optical element.

Abstract: A projector includes a light source, a light integration rod, a light valve, and a projection lens. The light source provides an illumination beam. The light integration rod has a light incidence end and a light emission end opposite to each other. Through the light incidence and emission ends, the illumination beam is emitted into and out from the light integration rod, respectively. Each of the light incidence end and the emission end is in a rectangular shape. The light incidence end has a first long edge and a first short edge. The light emission end has a second long edge paralleling to the first short edge and a second short edge paralleling to the first long edge. The light valve converts the illumination beam into an image beam. The projection lens is disposed on a transmission path of the image beam. A light integration rod is also provided.

Abstract: Three dimensional projection systems may be single projector or multiple projector systems. These 3D projection systems may include a one or more polarization conversion systems (PCS). Each PCS may be designed for relatively small throw ratios and thus, may be designed to accommodate the small throw ratios. Each PCS may include a polarizing beam splitter, a first optical stack, a reflector and a second quarter wave retarder. The first optical stack may include a rotator, a polarizer, a polarization switch and a first quarter wave retarder. Each PCS may receive light from a respective projector, and the PBS in each PCS may direct the light toward the first optical stacks. The light may be converted to a different polarization state as it passes through the first optical stack. The converted light may then be re-directed by a reflecting element to a second quarter wave retarder. The second quarter wave retarder may convert linearly polarized light to circularly polarized light.

Abstract: A laser projector displays an image based on raster scanning of a laser beam. The laser projector is capable of reliably detecting the deflection angle of a vibratory mirror used for horizontally scanning without the need for a light source other than a laser light source for displaying images even if the deflection angle is small, and also of accurately adjusting the deflection angle of the vibratory mirror to a predetermined deflection angle at the resonant frequency of the vibratory mirror without exceeding the predetermined deflection angle.

Abstract: An optical device includes a main body having a light incident surface, a light emitting surface provided facing the light incident surface, and a light-reflecting side surface provided from a periphery of the light incident surface to a periphery of the light emitting surface. In the optical device, the light incident surface, the light emitting surface and the light-reflecting side surface are mirror-finished, and a supporting portion configured to support the main body is provided on the light-reflecting side surface.

Abstract: A projection system having a first tilting mirror matrix, a second tilting mirror matrix, and an imaging lens, which projects the first tilting mirror matrix onto the second tilting mirror matrix, wherein each tilting mirror matrix has multiple tilting mirrors, the tilting axes of which are positioned in a modulator surface plane. The imaging lens includes a first lens and an imaging mirror, and the imaging mirror forms an aperture stop of the imaging lens, wherein the aperture diaphragm includes an uneven angle of 90° together with the normal of the modulator surface of the first tilting mirror matrix without taking into account any optical path folds.

Abstract: An illumination apparatus includes a fluorescence unit, laser light irradiation means, and a beam integration unit. The fluorescence unit has a plurality of phosphors, in which the colors of fluorescence generated due to excitation differ, arranged in different regions. The laser light irradiation means irradiates laser light onto the regions of each color of the fluorescence unit while changing the position at which the laser light strikes the fluorescence unit. The beam integration unit integrates fluorescence from each region of the fluorescence unit on a display panel.

Abstract: According to the present invention there is provided a method for projecting an image on to a display surface, comprising the steps of, providing two or more projection systems; arranging the two or more projection systems such that they each project an image on a display surface; off-setting an oscillating reflective surface within at least one of the two or more projection systems such that the image projected by each of the two or more projection systems are in co-operation on the display surface.

Abstract: An object is to provide a image projection device which has a small size but can project an image having a high image quality. To achieve the object, in an image projection device, a reflection part which reflects a light flux from a light source is, while being rotated around a first axis by non-resonance driving, rotated by resonance driving around a second axis which is substantially perpendicular to the first axis, and thereby the light flux is deflected in a two-dimensional direction. By controlling the rotation of the reflection part, a correction for suppressing an image distortion along one scanning direction on a projection surface, and a correction for keeping substantially constant a scanning speed of the light flux along the other scanning direction on the projection surface, are performed.

Abstract: An illumination optical system includes first and second lamp units, a light combining portion that combines a light beam from the first lamp unit and a light beam from the second lamp unit, at least one light returning portion disposed between the first lamp unit and the light combining portion, or between the second lamp unit and the light combining portion, or both, the or each of the at least one light returning portion dividing a part of light emitted from the corresponding lamp unit into a light beam to be returned to the lamp and a light beam to be led to the light combining portion, and a condenser lens that condenses light from the light combining portion.

Abstract: A reflector mounting structure includes a reflector and a fixing member. The reflector includes: a reflecting surface; a reflector body having the reflecting surface formed thereon; a pair of first connecting units provided respectively at an end face of the reflector body and having a substantially spherical first protrusion at an end thereof; and a second connecting unit provided at an end face of the reflector body. The fixing member which supports the reflector includes a pair of first supporting units respectively having a planar contact portion and bringing the contact portion into contact with an end of the first protrusion, and a second supporting unit. A contact-portion vertical distance is set such that the first protrusion moves while rolling with respect to a contact portion when the reflector deforms.

Abstract: A projection system comprises an image input element and an optical imaging element. The image input element is configured to input an original image or a processed image. The optical imaging element, an optical system with axisymmetrical structure and specific spherical aberration, is configured to generate an image with extended depth of field on an image projection surface in accordance with the original image or the processed image.

Abstract: An image display apparatus includes: a light source unit which emits axially symmetric polarized light having polarization distribution symmetric with respect to the center axis of light; and a scanning unit which applies the axially symmetric polarized light to a projection surface for scanning to form an image.

Abstract: A combined video display and image capture system and method are disclosed. In one embodiment the system alternates between the capture period of the camera (306) and the image display (302) period to isolate the camera (306) from the display (302). Various methods are disclosed to achieve the alternation in the capture and the display periods of the system. Distortions in the captured image can be corrected using an image correction subsystem.

Abstract: An optical system is provided. The optical system includes a luminous system which comprises a plurality of light source devices and an image unit; and a projection system which receives light having an image through the luminous system, and enlarges and projects the light, wherein the plurality of light source devices comprise a reflection member which reflects light beam emitted from the light source devices, and are disposed so that the light beam emitted from the light source devices is reflected by the reflection member one time and enters to the image unit.

Abstract: In a light beam scanning projection apparatus which scans a light beam emitted from a laser light source, an image display apparatus is configured including a plurality of light beams, a reflection mirror for reflecting the light beams to project them onto a screen or the like, and a mirror driving unit for driving the reflection mirror so that the plurality of light beams are incident on the reflection mirror with different optical axes and projected on different projection areas, thereby displaying a single image with a plurality of images. Further, by forming a single image by causing a plurality of the light beams to have predetermined relative angles thereamong so as to make a plurality of images overlap on each other with slight shifts, a scanning projection apparatus is provided with which the luminance of the image is improved while conforming to safety standards.

Abstract: A high efficiency micro projection optical engine includes a light source module, a lens assembly, a micro display panel and a projection lens. An image of the luminous surface of light emitting elements of the light source module is formed in the vicinity of the micro display panel. The micro display panel is arranged on the path of emission light of the lens assembly to modulate incident light and obtain image light with image information. The projection lens is used to project the image information on the micro display panel and form an image onto a screen. The optical engine enhances efficiency by means of critical illumination.

Abstract: A freeform optical device is disclosed which has an at least partially curved surface with a surface geometry. Surface normals at multiple locations on the surface geometry can be computed to define the surface geometry with respect to multiple focal points corresponding to the surface normals at the locations in order to correct optical aberrations otherwise occurring at the focal points.

Abstract: A light source device includes: a first light source configured to emit a first source light in a first wavelength range; a source light generator configured to generate, from the first light, a color-varying source light having time varying color; a second light source configured to emit a second source light in a second wavelength range that is different from the first wavelength range; and a light source controller configured to control driving timing for turning on and off each of the first light source and the second light source so as to cyclically select one of the color-varying source light and the second source light to be output as an output source light.

Abstract: A projector includes a main body and an optical assembly. The main body forms an image and projects the image to a first screen through a lens of the main body. The optical assembly is detachable from the light path of the lens, and is used for reflecting light beams emitted from the lens to project an image on a second screen when the optical assembly is in the light path of the lens. When the optical assembly is detached from the light path of the lens, the optical assembly projects the image on the first screen. The first screen and the second screen are on two adjacent perpendicular surfaces, such as a wall and a ceiling.

Abstract: A projection system for projecting an output image. The projection system comprises a plurality of laser diodes, each laser diode operable to generate a light beam having a selected intensity in response to a control voltage and a control current and combiner optics for combining light beams received from the plurality of laser diodes to generate an output light beam. A MEMS mirror module receives the output light beam from the combiner optics and generates a scanning light beam that forms the output image on a projection surface. A controller adjusts the control voltage associated with each of the plurality of laser diodes for a first line of pixel data in response to a determination of a level of contrast associated with the first line of pixel data.

Abstract: A projector for projecting an image includes: a light source for generating a light bundle; a pivotable deflection unit for deflecting the light bundle generated by the light source onto a projection surface; and an imaging device for imaging an aperture of the deflection unit onto the projection surface. The imaging device includes a mirror objective having at least two mirror elements. A method for projecting an image is also provided.

Abstract: A projector includes: a first solid-state light source device including a first solid-state light source emitting main excitation light, and a fluorescent layer converting the main excitation light to light including a first color light component and a second color light component different from the first color light component, and emitting converted light; a second solid-state light source device including a second solid-state light source emitting a third color light component different from the first and second color light components; a light modulation device modulating the first, second and third color light components in accordance with image information; a projection optical system projecting the modulated light components from the light modulation device as a projection image; and a color light combining optical system combining light emitted from the first solid-state light source device and the third color light component.

Abstract: A projection system including a light valve, a lens, an arc reflector, and an arc screen is provided. The light valve is capable of providing an image beam. The lens is disposed in the transmission path of the image beam. The arc reflector has an arc reflective surface. The arc reflective surface is disposed in the transmission path of the image beam from the lens, so as to reflect the image beam. The arc reflective surface is curved in a first direction and not curved in a second direction substantially perpendicular to the first direction. The arc screen is disposed in the transmission path of the image beam reflected by the arc reflective surface. The arc screen is curved in the first direction and not curved in a third direction substantially perpendicular to the first direction. A projection apparatus and an imaging module are also provided.

Abstract: A 2D image display apparatus using a laser light source. By controlling the timing of a scan by a beam scan portion in response to the characteristic of a laser light source and by setting a light emitting time of the laser light source to an integral multiple of a scan cycle of the beam scan portion, it is possible to illuminate a spatial light modulator homogeneously with a laser beam. It is thus possible to display an image at high accuracy without causing a bright line, irregularities in brightness, and contrast deterioration.

Abstract: A system for projecting images has an illumination system for providing light, a spatial light modulator including an array of individually addressable pixel modulator elements with curved reflective surfaces, and projection optics for projecting the modulated light to form the image, wherein no focal planes of the projection optics are aligned to the reflective surfaces of the pixels.

Abstract: Disclosed are illumination systems especially suitable for very small data projectors, called pico projectors. The disclosed illumination systems provide high optical efficiency for projectors that need polarized light but utilize unpolarized light sources such as light-emitting diodes. Some of the disclosed illumination systems make use of light sources of different colors, and provide polarization conversion in ways based on color-selective elements of a variety of different types to convert substantially all the light emitted by the light sources to a single polarization, without increasing the effective optical extent of the source. Other disclosed illumination system provide compact ways to combine light from differently colored light sources without the use of bulky x-cube or angled dichroic elements.

Abstract: A projection type display device includes a image displaying element having image display areas for displaying a plurality of images respectively, a projection optical system having an emitting part for emitting projection light flux to the image display areas of the image displaying element, and a plurality of screens for displaying projected images by the projection light flux transmitted through the image display areas of the image displaying element. In the projection type display device, the image display areas are formed in respective areas in the image displaying element independent of each other. The projected images on the screens correspond to the image display areas, respectively. Each of the screens is arranged in such a position that the each of the screens is not overlapped with shadows of the other screens which are produced since the projection light flux is emitted from the emitting part to the screens.

Abstract: Three dimensional projection systems may be single projector or multiple projector systems. These 3D projection systems may include a polarization conversion system (PCS). The PCS may be designed for relatively small throw ratios and thus, may be designed to accommodate the small throw ratios. The PCS may include a polarizing beam splitter, a first optical stack, a reflector and a second quarter wave retarder. The first optical stack may include a rotator, a polarizer, a polarization switch and a first quarter wave retarder. The PCS may receive light from a projector and the PBS may direct the light toward the first optical stack. The light may be converted to a different polarization state as it passes through the first optical stack. The converted light may then be re-directed by a reflecting element to the second quarter wave retarder. The second quarter wave retarder may convert linearly polarized light to circularly polarized light.

Abstract: An optical system includes a light source array, a dichroic mirror set, a light converting device and a light guide pipe. The light source array is used for emitting a first homogeneous light. The dichroic mirror set is disposed in a light path of the first homogeneous light and used for reflecting a part of the first homogeneous light to the light guide pipe, transmitting the remaining part of the first homogeneous light to the converting device. The light converting device is disposed in the transmitting light path of the dichroic mirror and used for transferring the first homogeneous light into a second, third homogeneous light. The dichroic mirror is further used for reflecting the second, third homogeneous light to the light guide pipe. The light guide pipe is used for mixing the first, second and third homogeneous light to obtain a white light.