Abstract: The invention discloses a projection system including a light source, a light gathering device, an imaging device, and a projection lens. The light source is used for emitting a first light, and the light gathering device includes an aperture and a lens for receiving the first light in sequence and producing a second light. The imaging device includes a field lens and a reflective valve near the field lens, and the field lens and the reflective valve are used for receiving the second light in sequence and producing an exit pupil. The projection lens has an entrance pupil, and the entrance pupil substantially overlaps the exit pupil.

Abstract: An enclosure of a dichroic mirror system that synthesizes a plurality of monochromatic laser beams emitted from a laser light source to output synthesized light is a structure having a dichroic mirror system lower enclosure and a dichroic mirror system upper enclosure joined to each other, and includes a light-leakage protecting structure that is formed by a convex portion formed at an end of the dichroic mirror system lower enclosure and a concave portion formed at an end of the dichroic mirror system upper enclosure engaged with each other at a joint therebetween.

Abstract: In at least one embodiment of the disclosure, a projector includes a light shield unit that shields a portion of a light emitted from a light source. The light shield unit is driven by a drive mechanism and rotates around a predetermined rotation axis to change a size of a light shield area. The light shield unit includes a leading edge having a contour defined by a plurality of first edges and a second edge disposed between the first edges. The second edge configured so as to be shifted toward the light source and away from the first edges during rotation of the light shield unit.

Abstract: A projection apparatus includes at least one light source, a field lens, a light valve, and a projection lens. The light source provides an illumination beam. The field lens is disposed in a transmission path of the illumination beam including an effective beam passing through the field lens and a ghost beam reflected by the field lens. The light valve converts the effective beam into an image beam. The projection lens includes a lens group, an aperture stop, and a light-shielding element. The lens group and the aperture stop are disposed in a transmission path of the image beam passing through the field lens and a ghost beam path of the ghost beam reflected by the field lens. The light-shielding element is disposed in at least a portion of the ghost beam path between the lens of the lens group furthest away from the aperture stop and the aperture stop.

Abstract: A projector includes a casing, a light source, and a heat dissipation device. The light source and the heat dissipation device are installed inside the casing. Two openings are formed at two sides of the casing opposing to the light source. A light shield is positioned on one of the two openings. The light shield has a fixing plate, and a plurality of first parallel light-shielding plates and a plurality of second parallel light-shielding plates for blocking light leaking from the openings.

Abstract: A projector includes: first and second light blocking members adapted to partially block a light beam from a light source, and a drive section adapted to make the first and second light blocking members perform an opening and closing operation. When the corresponding first and second light blocking members are located at a maximum blocking state, with respect to an opening and closing direction of the first and second light blocking members perpendicular to a system optical axis, a first and second support sections support the first and second light blocking members at predetermined positions on the system optical axis side from intermediate positions corresponding to midpoints of areas between edge portions of the first and second light blocking members on the system optical axis side and parts, to which outer edges of the light beam to be blocked are input.

Abstract: A projection optical system that receives light from a display element to project an image displayed by the display element onto a screen with enlargement at a varying magnification achieved by varying the projection distance to the screen has: a refractive optical system composed of one or more refractive lenses and having a positive optical power; and a concave-surfaced mirror disposed to the screen side of the refractive optical system and having a plane-symmetric reflective surface. The projection optical system includes at least one optical element designed to be movable for focusing. The projection optical system forms an intermediate image between the refractive optical system and the concave-surfaced mirror. Moreover, a prescribed conditional formula is fulfilled.

Abstract: In a projection optical system for use in an image projection apparatus illuminating an image display panel forming an image in accordance with a modulating signal with illumination light from a light source, the projection optical system includes first and second optical systems arranged along an optical path defining an upstream-downstream direction in the order described from upstream to downstream on the downstream side of the image display panel. The first optical system includes at least one dioptric system and has positive power. The second optical system includes at least one reflecting surface having power and has positive power. The image formed by the image display panel is formed as an intermediate image in the optical path, and the intermediate image is magnified and projected.

Abstract: A projection system includes a projection screen defining a shape and a projector configured to project an image onto the projection screen. The projector may project a static or dynamic image that has substantially the same shape as the projection screen or otherwise block portions of the projected image that are projected outside of the projection screen with the aid of a virtual mask. The virtual mask and the projection screen may be created based on a virtual shape template that defines the desired shape for the projection screen, such as with a vector outline. In some embodiments, the virtual mask and the projection screen are created based on the same virtual shape template. The virtual shape template may define a cutting path for extracting the projection screen from a suitable material.

Abstract: An optical system, projector and method are provided that include a projection gate between a light source array and a projection lens. The projection lens projects an image of the projection gate. A relay lens group between the light source array and the projection gate prevents the projection lens from projecting an image of the light source array. A lamp housing is provided for use with a projector housing. The lamp housing includes a light source array and a relay lens group located between the light source array and a projection gate in the projector housing. An illumination source for optical fibers is provided that includes a relay lens group between a light source and a coupling in a housing. The relay lens group prevents an image of the light source from being formed at input ends of optical fibers positioned in the coupling.

Abstract: A liquid crystal rear projector device of the present invention includes a lamp unit providing a light source, a cooling fan for cooling the lamp unit, and an optical system for generating color image light with the lamp unit providing a light source, the lamp unit including a light emitting tube providing a light source, and a reflector for reflecting light emitted from the light emitting tube toward the optical system. The reflector has an air introduction hole for introducing air discharged from the cooling fan into the reflector, which is provided near the spherical portion of the light emitting tube, and faces to a vertical top of the spherical portion to blow the air to the top.

Abstract: An optical device includes a light source, a light valve and a projection lens configured to enlarge an image to be displayed on the light valve. The light valve is disposed in the vicinity of an object plane of the projection lens. The light source illuminates a peripheral portion more brightly than an optical axis portion, in a plane parallel to the object plane located in the vicinity of the object plane of the projection lens. The optical axis portion is a portion where an optical axis passes through and the peripheral portion is a portion located in the periphery of an optical axis portion.

Abstract: A projector capable of preventing a light tunnel from positional deviation is obtained. This projector comprises a rectangular light tunnel having a hollow light guide path capable of passing light therethrough for shaping the light with the light guide path, an optical component holding member provided with a holding portion holding the light tunnel and a light tunnel clip including a first pressing portion and a second pressing portion pressing first and second surfaces, adjacent to each other, of the light tunnel toward the holding portion of the optical component holding member for holding the light tunnel in a pressed state, while the first pressing portion and the second pressing portion press positions of the first and second surfaces of the light tunnel located substantially on the same line perpendicular to the traveling direction of the light respectively.

Abstract: A lens hood for a camera, includes a sun shade projecting in front of the camera lens and/or at least one hood wing which can pivot about a vertical or horizontal pivot axis. Included is a three-dimensional structure with a basket-like holder for the sun shade and a fastening means, which defines the vertical or horizontal pivot axis and can pivot, for the hood wing.

Abstract: Provided is an image display apparatus, including: a light modulation element; an illumination optical system which includes at least one light source unit including a plurality of light emitting units two-dimensionally arranged and illuminates the light modulation element; and a projection optical system for enlarging and projecting an image of the light modulation element onto a projection surface, in which: an image of the plurality of light emitting units is imaged at a position corresponding to a stop of the projection optical system; the stop has an aperture shape of rotational asymmetry or of two-fold symmetry; and the plurality of light emitting units have illuminance intensities each independently controlled.

Abstract: An optical diaphragm for adjusting an amount of an incident light beam, includes: light shielding vanes that are configured movably, and move to change an opening area enabling a passage of the light beam, thereby adjusting the amount of the light beam; an electromagnetic actuator including a coil through which a current passes, and a permanent magnet that generates a magnetic flux, moves with respect to the coil by an electromagnetic force due to an interaction between the current passing through the coil and the magnetic flux, and is connected to the light shielding vanes to move the light shielding vanes; and a position detector including: a magnetic element that outputs a predetermined voltage in accordance with intensity of a magnetic field from the permanent magnet; and an output characteristics corrector that obtains a predetermined correction parameter, and corrects output characteristics of the magnetic element based on the correction parameter.

Abstract: An optical system is provided which includes an illumination system with a light source, a lens member which guides light from the light source, and a mirror member; an image unit on which an image is formed and on which light from the illumination system is incident; a projection system which magnifies and projects the image formed on the image unit; and a blocking unit which is mounted to the mirror member of the illumination system and partially blocks light from the light source that is directed to the mirror member.

Abstract: In a light projection system, potentially hierarchical levels of light intensity control ensure proper laser-light output intensity, color channel intensity, white point, left/right image intensity balancing, or combinations thereof. The light projection system can include a light intensity sensor in an image path, in a light-source subsystem light-dump path, in a light-modulation subsystem light-dump path, in a position to measure light leaked from optical components, or combinations thereof.

Abstract: A projector includes: an illuminator that emits an illumination light flux; a light control mechanism that blocks at least part of the illumination light from the illuminator; a light modulator illuminated with the illumination light from the illuminator; a projection system capable of projecting modulated light formed by the light modulator and switching the f number when the modulated light is projected; and a control unit that controls the open/close state of the light control mechanism in accordance with the f number of the projection system so that illumination light having an angular distribution corresponding to the f number of the projection system is incident on the projection system.

Abstract: There is provided a projector having a point light source disposed to an edge of an optical fiber for transmitting exciting light and including a fluorescent illuminant for emitting fluorescence by being exited by the exiting light, a light collecting optical system for collecting the fluorescence emitted from the point light source, a reflective display device for reflecting the fluorescence collected by the light collecting optical system and overlapping the fluorescence with an image signal, an outgoing aperture for stopping down the fluorescence overlapped with the image signal by the reflective display device, wherein the outgoing aperture and the point light source are disposed side by side in the vicinity of the front focusing surface of the light collecting optical system.

Abstract: A projection optical system includes a digital micro-mirror device and a light blocker disposed along the light path of the digital micro-mirror device. The digital micro-mirror device includes a base having a plurality of outer pads, a micro-mirror array disposed on the base, and a plurality of bonding wires. The bonding wires are electrically connecting the outer pads with the corresponding micro-mirror array. The light blocker is configured for blocking the light incident to the bonding wires and the light reflected by the bonding wires.

Abstract: An adjusting mechanism for a rod module adapted to an optical engine is provided. The adjusting mechanism utilizes two wedge-shaped blocks moving in perpendicular directions so as to convert the vertical adjustment of horizontal adjusting component into horizontal adjustment of an LIR module. Therefore, operators may adjust the horizontal and vertical position of the rod module from the same side of the projector, thus increasing the convenience in adjusting the position of the rod module.

Abstract: The projecting zoom lens includes, sequentially from its magnification side, a negative first lens group, a positive second lens group, a negative third lens group, a positive fourth lens group, a positive or negative fifth lens group, and a positive six lens group, while the reduction side of the projecting zoom lens is formed as a telecentric system. When the power of the zoom lens is varied, the first lens group and sixth lens group are fixed, while the second to fifth lens groups move. In such power varying operation, the movement of the third lens group advances from the magnification side to the reduction side as the zoom lens goes from the wide angle end toward the tele end.

Abstract: An optical system comprises a first image capture device for capturing an image of an observation area, a first display device, a semi-reflecting plate, a concave mirror disposed facing the first display device, and a second display device for displaying a background image. A light beam is scattered by the first display device through the semi-reflecting plate and then reflected by the mirror and the semi-reflecting plate in order to display an aerial image between the semi-reflecting plate and the observation area. A projector projects a light beam toward one of the display devices. The first image capture device is adapted to capture the image of the observation area via said one display device. A alternating control device alternates capture of an image of the observation area by the first image capture device and projection of the light beam projected by the projector.

Abstract: According to the present invention, a projection type image display apparatus enables control of a large amount of light masking through a light-masking unit while maintaining a uniform illumination distribution in an area to be illuminated by the illumination light. The apparatus uses two array lenses on which lens cells are arranged in matrix form, where light-masking unit masks the array lens installed on the light source side in their particular area. The light-masking unit adjusts the amount of light emitted from the light source. The light-masking area of lens cells adjacent to lens cells closest to an optical axis is made smaller than the light-masking area of other cells.

Abstract: In at least one embodiment of the disclosure, a light control device includes a light blocking module to block a luminous flux passing through the light control device in a direction parallel to a system optical axis. The light blocking module includes a first and a second light blocking member. The first light blocking member includes a cutout portion at an end near a system optical axis, the first light blocking member configured so as to change a size of an area blocking the luminous flux in accordance with an opening and closing operation of the light blocking module. The second light blocking member is disposed in proximity to the first light blocking member and configured so as to increasingly block the luminous flux from passing through the cutout portion of the first light blocking member in accordance with the closing operation of the light blocking module.

Abstract: A projection optical system for enlarging and projecting a light flux from an image display panel modulating an irradiation light, onto a screen in an oblique direction, the projection optical system includes: a lens system including a plurality of lenses, the lens system refracting the light flux from the image display panel; a single convex mirror reflecting the light flux from the lens system, the lens system and the convex mirror being arranged in an order from the image display panel; and a stop disposed in an optical path after an emission from the lens system to an incidence on the convex mirror.

Abstract: A gear portion meshing with the first step of a pinion gear at the side of a motor, which is a driving unit of optical aperture mechanism, is designed to be a two-gears composition of a gear portion abutting on one side surface of the channel of the pinion gear, and a gear portion abutting on the other side surface of the channel of the pinion gear.

Abstract: A brightness control apparatus applied to an illuminating system of a projector includes a plate and a slot portion. The slot portion is formed in the plate for a light beam of the illuminating system passing through. The slot portion has two opposite edges located at two sides of an arc locus. The center of the arc locus is a rotating center of the plate. The distance between the two edges of the slot portion is changed with the arc locus. The arc locus has a start point and an arbitrary point which are relative to the center of the arc locus, so as to form a central angle. The mathematics relationship between the distance of the two edges at the arbitrary point and the central angle is a polynomial function. The degree of the term with the highest degree is equal to or more than six.

Abstract: An imaging system suitable for projecting an image beam provided by a light valve unto a screen is provided. The imaging system includes a projection lens and a light beam modulation module. The projection lens is disposed on an optical path of the image beam, so as to project the image beam unto the screen. The light beam modulation module comprising a fixed light shutter and a movable light shutter is disposed between the projection lens and the light valve. The fixed light shutter is disposed on the optical path of the image beam so as to shield off a portion of the circumferential light of the image beam. The movable light shutter is suitable for moving into the optical path of the image beam to shield off another portion of the circumferential light of the image beam.

Abstract: An image projecting apparatus has an integrator for generating plural secondary-light-source images for generating illumination light with a uniform intensity; and a variable stop mechanism arranged at or near a position conjugate with the secondary-light-source images. The variable stop mechanism has a base plate having a fixed aperture; and a stop blade which moves across the aperture for changing a quantity of light. The change in the quantity of light passing through said variable stop caused by the movement of said stop blade is greater than a change in a size of an effective region of a stop aperture.

Abstract: A projector includes: an illuminating device including a light source device, a first lens array that comprises first regions located at four corners in the first lens array when viewed along a system optical axis and second regions located between the two first regions, and a second lens array; a light modulating device; a projection optical system; a light control device; and a mode selection device. The light control device blocks part of the plural partial light beams by causing first and second light shields to integrally operate, when the brightness priority mode is selected. The light control device always blocks part of the partial light beams with the first light shields and blocks part of the partial light beams by causing the second light shields to operate independently from the first light shields.

Abstract: A projection optical apparatus capable of providing high image quality and having a reduced size. The projection optical apparatus comprises a light valve and a projection optical system including a first optical system (5) having a transmissive-refractive element and a second optical system (3?) having a reflective-refractive element. An image formed on the light valve is projected by the projection optical system on a projection surface (4). The optical axis in the first optical system (5) is folded both vertically and horizontally. The first group (5A) of the first optical system is contained in a space (dead space) whose lower limit is defined by a lower edge of the second optical system (3?)/thereby reducing the depth of the apparatus.

Abstract: A projector includes: a light source, a light amount control device, an electro-optic unit, and a projection device, the light amount control device includes a light-shielding member configured to shield part of the luminous flux emitted from the light source, a holding member configured to hold the light-shielding member, the holding member is formed of a material having a coefficient of thermal conductivity lower than the coefficient of thermal conductivity of the light-shielding member, and a position changing unit configured to move or rotate in order to change the position of the light-shielding member, the light-shielding member is attached to the position changing unit via the holding member, and the light-shielding member comes into contact with the holding member via a projection provided on at least one of the light-shielding member and the holding member.

Abstract: A dynamic aperture, positioned in the path of light, includes a pair of parallel blades, a connecting member, a driving member, and a motor. The projection device includes a light source configured for generating light. The connecting member is fixed to the projection device and rotatably interconnects a same side of the blades. The driving member rotatably interconnects the opposite side of the blades so that the blades, the connecting member, and the driving member constituting a variable quadrangular frame. The motor is coupled to the driving member and is configured for rotating the driving member. Rotation of the driving member and restriction of the projection device to the connection member alter dimensions of the variable quadrangular frame and accordingly adjust a gap between the blades through which the generated light passes.

Abstract: According to the present invention, a projection type image display apparatus enables control of a large amount of light masking through a light-masking unit while maintaining a uniform illumination distribution in an area to be illuminated by the illumination light. The apparatus uses two array lenses on which lens cells are arranged in matrix form, where light-masking unit masks the array lens installed on the light source side in their particular area. The light-masking unit adjusts the amount of light emitted from the light source. The light-masking area of lens cells adjacent to lens cells closest to an optical axis is made smaller than the light-masking area of other cells.

Abstract: A projector includes a plane mirror that is disposed at one end side of an end portion of a screen and a projection optical system that is disposed at a position that is separated from a reflection surface side of the plane mirror. A light shielding plate is provided to at least one of two positions; one is between a fourth mirror and the plane mirror of the projection optical system, and the other is between the plane mirror and the screen.

Abstract: A light-quantity adjusting function of a diaphragm used for light quantity control for improving the contrast of a projected image is controlled to cancel light quantity variation due to variation of the driving power of the light source for increasing the service life. This control keeps the quantity of light coming into a display element at a constant value and achieves both service life extension of the light source and image projection having no brightness fluctuation.

Abstract: A lighting device used for an image display device including a light modulator that modulates light emitted from a light source device includes: a diffractive optical element on which the light emitted from the light source device is made incident and that generates diffractive light from the light made incident thereon and lights the light modulator with the diffractive light; and a light shielding member that is arranged between the diffractive optical element and the light modulator and shields 0-th order light emitted to the light modulator.

Abstract: Throughput efficiency of an optical system is enhanced by using a directional light source coupled to a non-imaging optical element matched to a size and acceptance angle of an imaging lens. In various embodiments, a beam projection system and accompanying method are described that include a lamp body formed from a dielectric material. A bulb, placed adjacent to the lamp body, has a fill that forms a plasma when RF power is coupled to the fill from the lamp body. An optical train is optically coupled to the bulb to transform light generated by the plasma. The optical train includes a non-imaging optical element, an aperture, and at least one imaging lens element.

Abstract: A projection display apparatus 101 in which the light quantity adjusting means has a simple and readily interchangeable structure, and which can improve image quality by adjusting the quantity of light received by a light valve continuously, without causing illuminance irregularities, and without having unwanted light radiated onto the screen, the light quantity adjusting means 9 having light blocking members 91L, 91R for blocking light in transit to a second lens array 22, and rotational axes 91LA, 91RA for turnably supporting each of the light blocking members on an xy plane, the light blocking members 91L, 91R and rotational axes 91LA, 91RA being positioned so that the rotational axes 91LA, 91RA are disposed in positions symmetric with respect to the optical axis AX on the xy plane, and the turning range from the light blocking initiation position at which the light blocking members 91L, 91R, by being turned, start to block light in transit toward the second lens array 22 to the maximum light blocking posi

Abstract: A drive, primarily for an optical light forming device, which light forming device can be used in a projector, which light forming device comprises an at least partly open area for light, where at least two light forming devices cooperate in a light path for forming the light, which light forming devices are rotated around a common axis in and out of the light path. To achieve opposite synchronous movement of light forming means, the light forming devices are rotated equal in opposite directions around the common axis by a common motor. Hereby, it can be achieved that the two light forming devices are rotated synchronously, but opposite in relation to each other. The opposite synchronous movement is very important if the light fainting devices are part of a modern computer controlled projector using step motors.

Abstract: A structure for protecting a rod integrator that is used for a projection display apparatus is provided. The structure has: a protecting tube for the rod integrator, the protecting tube accommodating the rod integrator therein, wherein the protecting tube has openings which are defined at positions that face a light incident surface and a light exiting surface of the rod integrator, respectively; and a light shield plate that is provided between the opening and a light source for emitting light to the rod integrator, the opening facing the light incident surface of the rod integrator, wherein the light shield plate has an opening for allowing light to pass therethrough so that the light is incident on the rod integrator.

Abstract: An adjusting device for positioning an integration rod within an optical engine module is provided. The optical engine module includes a casing having four sidewalls defining an optical path. The integration rod is disposed in the optical path. Each sidewall has a screw hole. The adjusting device includes two adjusting screws extending through the screw holes in two adjacent sidewalls of the casing in order to abut against the integration rod, thereby adjusting the position of the integration rod in the optical path and two positioning screws extending through the screw holes in remaining two adjacent sidewalls of the casing to abut against the integration rod for immobilizing the integration rod within the casing.

Abstract: A device includes a light source 1, a reflection-type light valve 9 that controls a traveling direction of exiting light based on an input signal, an illumination optical system 2, 3, 4, 6a that focuses light from the light source on the reflection-type light valve as illumination light, a projection lens 10 that projects exiting light from the reflection-type light valve, a first diaphragm 7 provided at a position of a pupil of the illumination optical system so as to block a part of the light from the light source, and a second diaphragm 8 provided at a position of the pupil of the projection lens so as to block a part of the exiting light from the reflection-type light valve. A part of the illumination light reflected from a surface of the reflection-type light valve to be incident on a pupil of the projection lens as unnecessary light is blocked by a combination of the first diaphragm and the second diaphragm.

Abstract: An edge blending device which suppresses an increase in a luminance of a projection screen in an overlap area in which projection lights projected from a plurality of projection units onto a screen overlap each other, is characterized by including: a light shielding unit holder which includes light shielding pattern formation portions which can form a light shielding pattern corresponding to the projection lights forming the overlap area; and a light shielding pattern drive controller which controls a drive of the light shielding unit holder in such a way that the light shielding pattern formation portions are positioned corresponding to the projection lights from the projection units.

Abstract: An optical projector system is provided. The optical projector system includes light source device, an optical system, a lens set, and a photoelectric conversion device. The optical system has a light entrance end corresponding to the light source device and a light exit end corresponding to the lens set. The light source device includes a light source and a hood enclosing the light source. The light source device, the optical system, and the lens set together form a light passage. The photoelectric conversion device is disposed on a deviating light zone outside the hood for receiving the light deviating from the light passage.

Abstract: A projection-type display apparatus includes an illumination optical system (1) including a light source, a reflection-type light valve (2) having an image forming area on a to-be-illuminated surface illuminated by the illumination optical system (1), and a projection optical system (3) that projects an image formed on the image forming area of the reflection-type light valve (2). The projection optical system (1) is shiftable in a direction approximately perpendicular to a projection optical axis. An F-number of the projection optical system (3) is smaller than an F-number of the illumination optical system (1). Between the projection optical system (3) and the reflection-type light valve (2), an opening defining member (12) that defines an incident side opening of the projection optical system (3) is provided, which is not moved by the shifting of the projection optical system (3).

Abstract: A projection assembly is provided herein. According to one exemplary embodiment, the projection assembly includes a modulator assembly, the modulator including at least one modulator panel, a projection lens assembly including a first projection lens sub-assembly in optical communication with the modulator assembly, the first projection lens sub-assembly being configured to form a virtual modulator, the virtual modulator corresponding to the output of the modulator assembly focused at a single plane.

Abstract: The present invention relates to a method of generating an image having a desired brightness, which image is generated by means of a device provided with at least one light source, at least one electro-optical light modulation panel and at least one light-control device. The light from the light source is converted into an image having a desired brightness via at least the electro-optical light modulation panel and the light-control device. The image to be projected is analyzed in a regulator, whereafter the electro-optical light modulation panel and the light-control device are driven, while a too bright image is generated by means of the electro-optical light modulation panel, which image is converted by means of the light-control device into an image having a desired brightness and a desired contrast.