Abstract: An optical engine module and a projection device are provided. The optical engine module includes a first prism, a light valve, a second prism, and a light-shielding element. The first prism is disposed on a transmission path of an illumination light beam. The light valve is disposed on the transmission path of the illumination light beam from the first prism. The light valve has a reflection surface suitable for converting the illumination light beam into an image beam. The second prism is located between the first prism and the light valve, and is disposed on the transmission path of the illumination light beam from the first prism and on a transmission path of the image beam from the light valve. The light-shielding element is located between the first prism and the second prism.

Abstract: A head-up display is configured to project an image on a transparent reflection member to cause an observer to visually recognize a virtual image, and includes a display device configured to display the image, and a projection optical system configured to project the image displayed by the display device as the virtual image for the observer. The projection optical system is configured to form the image as an intermediate image, and includes a first optical element configured to condense light, a first lens configured to condense light, and a second optical element configured to diffuse light. The first optical element, the first lens, and the second optical element are disposed in this order along an optical path from the display device.

Abstract: A spectrum measurement system includes a laser light source system, an optical signal receiving system and a beam splitting system. The laser light source system is configured to emit a laser output light beam to the object. The laser output light beam includes at least one of a first and a second peak-wavelength laser. After the object is radiated by the laser output light beam, the object generates a conversion beam. The conversion beam includes at least one of a first and a second spectral signals. The optical signal receiving system includes at least a first and a second signal receivers being respectively configured to receive the first and the second spectral signals. The beam splitting system provides a plurality of light exiting paths being configured to respectively transmit the first and the second spectral signals to the first and the second signal receivers.

Abstract: In described examples, a first TIR or RTIR element is arranged to introduce at least red light to a first spatial light modulator for modulation thereof, and a second TIR or RTIR element is arranged to introduce at least green light to a second spatial light modulator for modulation thereof. At least one of the first and second TIR or RTIR elements is arranged to introduce blue light to at least one of the first and second spatial light modulators, respectively, for modulation thereof: time-sequentially apart from the first spatial light modulator's modulation of the introduced red light, to an extent the blue light is so introduced to the first spatial light modulator; and time-sequentially apart from the second spatial light modulator's modulation of the introduced green light, to an extent the blue light is so introduced to the second spatial light modulator.

Abstract: A light source system and a lighting apparatus comprising: a light-emitting module which emits first light along a first light path and second light along a second light path; a wavelength conversion device which received the first light to emit excited light with a different color from that of the first light; and a compensation device which guides the second light and adjusts a luminous intensity distribution of the second light so that the luminous intensity distribution of the second light exiting from the compensation device is substantially identical to that of the excited light. The second light exiting from the compensation device is combined with the excited light to form third light to be emitted from the light source system. The luminous intensity distributions of the first light and the second light in the third light are substantially the same, and illumination light spots have a uniform color.

Abstract: A projection device includes: an illumination system providing an illumination beam; a light valve disposed on a transmission path of the illumination beam to modulate the illumination beam into an image beam; and a projection lens disposed on a transmission path of the image beam to project the image beam out of the projection device to form a portrait image. A center of the light valve has a first offset relative to a reference plane in a long side direction of the light valve. The reference plane includes a central axis of the projection lens. The reference plane is perpendicular to the long side direction of the light valve. A center of the portrait image has a second offset relative to the reference plane in a long side direction of the portrait image. The projection device of the invention provides a portrait image with favorable display quality.

Abstract: A projector includes an illumination system, a light valve, and a lens. The illumination system includes a scanning light source assembly and a wavelength conversion device. The scanning light source assembly provides an excitation beam. The excitation beam scans in a plurality of scanning directions. The wavelength conversion device is disposed on a transmission path of the excitation beam. The excitation beam scans the wavelength conversion device in the scanning directions in a plurality of time intervals respectively, and the excitation beam is converted into a color beam by the wavelength conversion device in one of the time intervals. The light valve is disposed on a transmission path of an illumination beam and converts the illumination beam into an image beam, wherein the illumination beam includes the color beam. The lens is disposed on a transmission path of the image beam.

Abstract: A first prism has first to third faces. The first face is opposing a first optical modulator. Any two planes among three planes respectively including the first to third faces intersect with each other. A second prism has fourth to sixth faces. The fourth face is provided to be in contact with the third face via a dichroic coating layer and in parallel with the third face. The fifth face is opposing a second optical modulator and in parallel with the second face. The sixth face is in opposite to the first optical modulator with respect to an optical axis of the second optical modulator. The sixth face is formed to be inclined with respect to a reference surface, such that an unnecessary transmitted light and an unnecessary reflected light of the dichroic coating layer are not totally reflected by the sixth face.

Abstract: A projection device includes an illumination system, a light splitting and combining element, at least two light valves and an image-forming lens. An illumination beam from the illumination system includes a first color light and a second color light. The light splitting and combining element allows the first color light to pass through and reflects the second color light. The two light valves are respectively disposed on transmission paths of the first and the second color light from the light splitting and combining element, and respectively convert the first color light and the second color light into a first and a second color image light. The image-forming lens receives the first and the second color image light to generate a projection beam, wherein the first color image light passes through and the second color image light is reflected by the light splitting and combining element to the image-forming lens.

Abstract: A lighting device includes: a liquid crystal element having electrode pattern including a first portion and a second portion; drive circuit connected to the electrode pattern; polarizer disposed in front of the liquid crystal element and separated from the liquid crystal element in optical axis direction; analyzer disposed at rear of the liquid crystal element, and separated from the liquid crystal element in optical axis direction, wherein the polarizer and the analyzer constitute crossed Nicol polarizers; light source for supplying lights to the liquid crystal element within a predetermined incident angle range; and projection optical system projecting lights transmitted through the liquid crystal element forwardly; wherein the polarizer and the analyzer locally overlap with the liquid crystal element in projection normal to the liquid crystal element, and when the light source is turned on, the drive circuit supplies drive signal to the first portion of the electrode pattern which applies or releases volta

Abstract: A reflector for deflecting electromagnetic waves is provided. Said reflector comprises a resistive material along its edges in a specific pattern, wherein the resistive material has a resistance per square meter being higher than the resistance per square meter of the material of the reflector in order to attenuate and/or absorb electromagnetic energy of the electromagnetic waves.

Abstract: An illumination system includes a lens group having an optical axis and a light flux cross-section perpendicular to the optical axis, a dichroic device including first and second dichroic layers, first and second excitation light sources and a phosphor wheel. The first and second dichroic layers reflect first and second excitation beams to the lens group respectively. A projection region collectively formed by projecting the first dichroic layer and the second dichroic layer on the light flux cross-section in a direction parallel to the optical axis is larger than a ¼ area of the light flux cross-section and smaller than a ½ area of the light flux cross-section. The phosphor wheel receives the first and second excitation beams passing through the lens group and has a reflective region and at least one phosphor region.

Abstract: A projection apparatus including an illumination system, a light valve, and an image-forming system is provided. The illumination system includes a first dichroic unit, a second dichroic unit, a third dichroic unit, two wavelength conversion modules, two light sources respectively emitting a first beam and a second beam, and an excitation light source module emitting an excitation beam. The first dichroic unit and the second dichroic unit are disposed on a transmission path of the excitation beam. The two wavelength conversion modules respectively convert the corresponding partial excitation beam coming from the first dichroic unit and the second dichroic unit into two converted beams. The light valve converts the first beam, the two converted beams, and the second beam coming from the third dichroic unit into an image beam. The image-forming system is disposed on a transmission path of the image beam.

Abstract: A projection-type video image display apparatus measures quantity of light of a plurality of light sources by maintaining illuminance distribution of an illumination luminous flux. The apparatus includes R, B and G light sources, and a mirror configured to reflect white light obtained by synthesizing the light rays emitted from the respective light sources while making the white light pass through the mirror based on predetermined transmittance characteristics. An illuminance sensor disposed on the mirror's back surface and configured to measure quantity of light for each color of the white light which passed through the mirror, and a controller adjusts an amount of light emission of the light source of each color based on the quantity of light measured. The mirror allows the transmittance characteristics of each light transmittance in the center wavelengths of the R and B lights sources to be larger than those of the G light source.

Abstract: A projection-type video image display apparatus measures quantity of light of a plurality of light sources by maintaining illuminance distribution of an illumination luminous flux. The apparatus includes R, B and G light sources, and a mirror configured to reflect white light obtained by synthesizing the light rays emitted from the respective light sources while making the white light pass through the mirror based on predetermined transmittance characteristics. An illuminance sensor disposed on the mirror's back surface and configured to measure quantity of light for each color of the white light which passed through the mirror, and a controller adjusts an amount of light emission of the light source of each color based on the quantity of light measured. The mirror allows the transmittance characteristics of each light transmittance in the center wavelengths of the R and B lights sources to be larger than those of the G light source.

Abstract: A light source system includes an excitation light source emitting excitation light in at least first and second time intervals; a compensation light source emitting compensation light in at least third time intervals, the compensation light including laser light of at least one color; and a rotating color wheel, including at least first and second regions, the first region generating light of at least two different colors in time sequence under irradiation of the excitation light in the first and second time sequences, and the second region transmitting the compensation light in at least the third time sequence. The light of the at least two different colors includes at least one type of wide-spectrum fluorescence, and the laser compensates for the fluorescence or light split from the fluorescence. The compensation light is directly transmitted without being irradiated upon fluorescent powder, so scattering loss of the compensation light is reduced.

Abstract: An image generating unit includes a fixed member on which one of a driving magnet and a coil is provided; a heat radiating part on which the other of the driving magnet and the coil is provided; and an image generating part, to which the heat radiating part is attached, configured to receive illumination light to generate an image.

Abstract: An image projection unit includes: a light source unit; a plurality of reflection-type image display elements; a plurality of total reflection prisms configured to guide lights of multiple colors emitted from the light source unit to the reflection-type image display elements and to emit the lights reflected from the reflection-type image display elements; a color synthesis prism configured to receive the lights emitted from the total reflection prisms, synthesize the lights, and emit the synthesized lights; a holding member fixed to the color synthesis prism and holding the reflection-type image display elements; and a base member supporting the color synthesis prism and the plurality of total reflection prisms

Abstract: A projector 10 includes an image forming panel 14 on which an image is formed, and a projection lens 15 which projects the image of the image forming panel 14 onto a screen 20. The center of the image forming panel 14 is fixed with being shifted in a direction opposite to a direction, in which a central position of a projection surface of the screen 20 is deviated with respect to an optical axis L of the projection lens 15. A lens barrel 31 of the projection lens 15 has an opening 34 as a heat release structure which is formed in a portion of a lens barrel 31 in a direction, in which the image forming panel 14 is shifted, on the image forming panel 14 side from a diaphragm position 32 where an F-Number of the projection lens 15 is determined.

Abstract: An image projection apparatus includes an optical modulation element, a lighting optical unit, a projection unit, and a shifting unit. The optical modulation element generates an image from light emitted from a light source. The lighting optical unit is configured to guide the light emitted from the light source to the optical modulation element. The projection unit projects the image generated by the optical modulation element. The shifting unit relatively shifts the optical modulation element with respect to the lighting optical unit. The shifting unit also generates driving forces to shift the optical modulation element, respectively, in a vertical direction, in a direction of being inclined by a first angle less than 90 degrees with respect to the vertical direction, and in a direction of being inclined by a second angle less than 90 degrees in an opposite side of the first angle.

Abstract: A light source apparatus includes: a phosphor wheel that is provided with a plurality of ring-shaped light-emitting regions that are arranged concentrically and that respectively generate illumination light beams of a plurality of colors when irradiated by excitation light; a light source unit that simultaneously radiates the excitation light to the ring-shaped light-emitting regions; and a plurality of optical elements that are irradiated by the plurality of illumination light beams that are generated due to the irradiation of the excitation light.

Abstract: A color mixing device and a display device are configured to represent the color white in a consistent fashion, even in low-luminance areas. These devices are provided with: a red light source for outputting red light at optical intensity in response to a first current presented thereto; a green light source for outputting green light at optical intensity in response to a second current presented thereto; a blue light source for outputting blue light at optical intensity in response to a third current presented thereto; and a color mixing means for color mixing of the red light, the green light, and the blue light together. A light attenuating part transmits or reflects the blue light, bringing about attenuation and advance thereof in the output direction. The blue light output by the blue light source is attenuated to a greater extent than the light of the other colors during output.

Abstract: Apparatus and methods for combining beams of amplified radiation are disclosed. A beam combiner has a collimating optic positioned to receive a plurality of coherent radiation beams at a constant angle of incidence with respect to an optical axis of the collimating optic. The respective angles of incidence may also be different in some embodiments. The collimating optic has an optical property that collimates the beams. The optical property may be refractive or reflective, or a combination thereof. A collecting optic may also be provided to direct the plurality of beams to the collimating optic. The beam combiner may be used in a thermal processing apparatus to combine more than two beams of coherent amplified radiation, such as lasers, into a single beam.

Abstract: A pico projection fixing module includes a bracket main body, plural color light sources, and plural collimator lenses. The bracket main body includes plural assembling seats. The plural assembling seats are arranged side by side. Each of the plural assembling seats includes a first assembling part and a second assembling part beside the corresponding first assembling part. The plural color light sources are installed on the first assembling parts of the plural assembling seats, respectively. The plural collimator lenses are installed on the second assembling parts of the plural assembling seats and aligned with the plural color light sources, respectively. Moreover, plural color light beams from the plural color light sources are projected out through the corresponding collimator lenses. Moreover, plural concave spaces are arranged around bottoms of the plural second assembling parts, respectively, wherein the plural concave spaces are separated from each other.

Abstract: An endoscope includes: an insertion portion to be inserted into a subject; an operation section provided at a proximal end of the insertion portion; a first light source section provided inside the operation section, the first light source section generating first light as broadband light having a broadband wavelength characteristic; a light guiding section that guides the first light emitted from the first light source section; a second light source section provided on a distal end side of the insertion portion, the second light source section generating second light; and an optical element provided on the distal end side of the insertion portion, the optical element combining the first light and the second light and emitting the resulting light from an illuminating window.

Abstract: An audiovisual apparatus includes a video projection section, a focal length adjustment section, an acoustic processing section, and an audio output section. The video projection section projects video corresponding to a video signal. The focal length adjustment section adjusts a focal length of the projected video. The acoustic processing section performs acoustic processing corresponding to the adjusted focal length, on an audio signal corresponding to the video signal. The audio output section outputs the audio signal on which the acoustic processing is performed.

Abstract: A LCOS projection system includes an illumination device, a LCOS microdisplay element, a polarization beam splitter, an optical projection lens, and a beam recycling module. A first portion of the lighting beams provided by the illumination device are transmissible through the polarization beam splitter and directed to the LCOS microdisplay element. A second portion of the lighting beams provided by the illumination device and from the polarization beam splitter are introduced into the beam recycling module. By the beam recycling module, a polarization state of the second portion of the lighting beams is converted. Consequently, the second portion of the lighting beams in the converted polarization state can also be projected onto the LCOS microdisplay element. The beam recycling module includes a total internal reflection prism, which is arranged in a transmission path of the first portion and the second portion of the lighting beams.

Abstract: A compact optical projection apparatus. An apparatus for light projection includes at least one illumination device; a cover prism including a curved surface positioned to receive illumination light rays and a total internal reflection surface positioned to internally reflect the light rays towards an asymmetric reflector surface positioned opposite the total internal reflection surface, the asymmetric reflector surface configured to reflect the received light rays out of the cover prism at an emitter side of the cover prism; a spatial light modulating the illumination light rays with image data to form image light rays; a reverse total internal reflection (RTIR) prism positioned between the spatial light modulator and the emitter side of the cover prism and further comprising a total internal reflection surface configured to totally internally reflect the image light rays out of the RTIR prism into a light projection device. Additional apparatus are disclosed.

Abstract: A light source device includes at least one light emitting diode, at least one dichroic mirror, a condenser, and a fly's eye device. The light emitting diode is operable to generate at least one kind of light. The dichroic mirror is disposed corresponding to the light emitting diode to combine the light into an optical path when the light passes through the dichroic mirror. The condenser is disposed corresponding to the dichroic mirror to gather the light when the light passes through the condenser. The fly's eye device is disposed corresponding to the condenser to homogenize the light when the light passes through the fly's eye device. Furthermore, a projection device is disclosed herein.

Abstract: This invention realizes an illumination optical system with a small etendue that has a longer lifetime and a high degree of brightness. The invention includes: a laser light source that generates excitation light; a phosphor that generates a fluorescent light by means of the excitation light; a light tunnel that projects the excitation light that is incident at one end towards the phosphor from another end, and projects a fluorescent light generated with the phosphor from the one end; and a dichroic mirror that is provided between the laser light source and the light tunnel, and that allows the fluorescent light or the excitation light to pass through, and reflects the remaining excitation or fluorescent light.

Abstract: An image projection image for projecting an image on a screen includes a light source, a scanning mirror and a prism. The light source includes laser diodes for emitting beams of different wavelengths. The scanning mirror reflects the beams radiated from the light source and projects the reflected beams. The prism is disposed at the rear of the scanning mirror to decenter the beams via the scanning mirror based on the wavelengths. In the image projection apparatus, the laser diodes are fixed to be vertically spaced apart from a reference height, corresponding to the wavelengths of the beams.

Abstract: Embodiments of the present invention provide a method, apparatus and system of producing a color image using four or more primary colors. The apparatus, according to some demonstrative embodiments of the invention, may include four or more transmissive spatial light modulators to modulate four or more, respective, primary color light beams in accordance with four or more, respective, primary color image components of the color image to produce four or more, respective, modulated light beams; and a beam combiner to combine the four or more modulated light beams into a combined light beam carrying the color image. The beam combiner may include, for example, an X-cube to jointly direct three of the four or more modulated light beams; and a selective color rotator to rotate the polarization of two of the three modulated light beams, while maintaining the polarization of a third one of the three modulated light beams. Other embodiments are described and claimed.

Abstract: A lighting device includes excitation light sources, phosphor wheel that emits green fluorescent light, a collimator lens that converts the emitted fluorescent light into parallel luminous flux, a red laser, a blue laser, a dichroic mirror that combines the excitation light supplied from the excitation light sources and the light supplied from the red laser, and a cross dichroic prism that combines the fluorescent light emitted from phosphor wheel, the light supplied from the red laser and the light supplied from the blue laser. The cross dichroic prism supplies the excitation light supplied from the excitation light sources to the collimator lens and the collimator lens condenses the incident excitation light on the phosphor wheel.

Abstract: A technology reducing the number of components in a projector. Illuminating light from a lamp is made incident from a first surface of a TIR prism via an optical system, reflected, output from a second surface of the TIR prism, optically modulated by a DMD, and made incident to the second surface of the TIR prism. Projection light from the DMD is transmitted through the TIR prism, emitted from a third surface of the TIR prism, and enlarged by a projection lens, to form an image on a screen. Light from a light emitting element is reflected by the screen, made incident to the third surface of the TIR prism via the projection lens, reflected, and output from a fourth surface of the TIR prism, to form an image on an imaging element.

Abstract: A projector includes a first light source apparatus, a second light source apparatus, a laser light source apparatus, a first light modulator, a second light modulator, a third light modulator that modulates light from the laser light source apparatus, a cross prism that combines first image light, second image light, and third image light formed by the respective light modulators with one another, and a secondary light source image formation system that forms a secondary light source image on an optical path between the laser light source apparatus and the third light modulator, and the secondary light source image is so shaped that the length thereof in a direction perpendicular to a central intersection line of the cross prism is longer than the length thereof in a direction parallel to the central intersection line.

Abstract: A micro projection system includes a primary prism as a light guide device. The primary prism has a bottom face and two slope faces. A light source module and a collimation lens are arranged at the bottom face of the primary prism to project red, green, and blue lights onto one of the slope faces of the primary prism to be consolidated by a wedge prism group and reflected toward a polarization beam splitting wedge prism arranged at another slope face, where the light is split into two polarized lights that are then emitted out of the primary prism to be processed and combined as light of consistent polarization by a lens array and a polarization conversion film so as to facilitate condensation and projection of the light by a polarization beam splitter and a projection lens.

Abstract: An image projection apparatus is provided, which includes an illumination unit which generates illumination light, a first prism which receives the illumination light from the illumination unit and performs total reflection of the illumination light, a reflection mirror which receives the illumination light from the first prism and reflects the illumination light, an image forming unit which forms an image from the illumination light that is reflected from the reflection mirror, and a second prism which performs total reflection of the image that is formed by the image forming unit toward a screen.

Abstract: A multi-DMD projection system uses an extended X-cube color splitting/recombining prism to implement splitting and recombining functions at different sections of the cube. Light directed from a white light source is split into red, green and blue components in a lower section of the cube. The components are directed to respective first, second and third DMDs for separate modulations and reentered into the X-cube prism by TIR prism for recombining at an upper section of the cube.

Abstract: In an optical unit of a projective display device which projects light source light reflected by a DMD, one prism of TIR prisms has a first boundary surface which is arranged in parallel to an emission surface of the light source light of other prism at a predetermined distance and on which the light source light from other prism is incident and a second boundary surface which is provided to face the DMD and emits the light source light illuminating the DMD and on which reflected light from the DMD is incident. When a swinging angle of minute mirrors of the DMD is set as ±?, a refractive index of the prisms is set as n, an angle formed by the first boundary surface and the second boundary surface is set as ?, and an emission angle of the light source light with respect to the DMD in the second boundary surface is set as ?, the swinging angle ?, the refractive index n, the angle ?, and the angle ? satisfy a predetermined relation.

Abstract: A light source device includes: a first light source (3a) that emits first polarized light of a plurality of colors including different wavelengths; a second light source (3b) that emits second polarized light whose polarization state differs from that of the first polarized light and that includes light of at least one color from among the plurality of colors; and a first color synthesis optical element (1) that synthesizes the first polarized light emitted from the first light source (3a) and the second polarized light emitted from the second light source (3b).

Abstract: An imaging optical system includes a lens unit that includes a plurality of optical elements, and an optical path combining portion that includes a flat plate disposed so as to be inclined with respect to an optical axis of the lens unit, and the lens unit includes a correction portion that has a shape asymmetric with respect to the optical axis in a cross section that is parallel to both a normal of the flat plate and the optical axis.

Abstract: A light collecting optical system includes surface-emitting light sources, collimate lenses, and a condenser lens. Light emitting surfaces of the surface-emitting light sources have a rectangular shape of the same size as each other, and have a similar figure to an incident surface of an integrator rod, the collimate lenses are disposed so that the optical distances from the collimate lenses to the condenser lens are approximately the same, and the surface-emitting light sources are disposed so that the optical distances Lr, Lg and Lb from the light emitting surfaces to the collimate lenses satisfy Lb<Lg<Lr and so that images of the light emitting surfaces, which are formed on the incident surface of the integrator rod by the collimate lenses and the condenser lens, have approximately the same size.

Abstract: A projection display device includes: a light source unit including light sources emitting light in a plurality of colors, condenser lenses and a color combining optical element; a total reflection prism that totally reflects a combined light flux from the color combining optical element so as to be guided to an image forming unit; and a projection lens. At least one of; an entry surface of the color combining optical element through which substantially parallel light fluxes from the condenser lenses enter, an exit surface of the color combining optical element through which the combined light flux exists, and an entry surface of the total reflection prism through which the combined light flux enters, is formed as a free curved surface where a shape of a section of the combined light flux is altered so as to be matched with a shape of an outline of the display area.

Abstract: In an image display system, a light distribution forming lens is placed between a laser light source and a spatial light modulator or a MEMS mirror device for adjusting a distribution of light intensity of the laser light so that light intensity at an exit pupil of a projection lens is greater in a radially intermediate part thereof than in a central part thereof. The light distribution lens is provided with a conical incident surface and a convex exit surface so as to function also as a collimator lens. Thereby, the image display system can be constructed as a highly compact unit that is highly efficient in the use of available light and free from the problem of speckle noises.

Abstract: The present invention relates to electronic technology field, and more particularly to CRT and projection system. A low power laser CRT based on parallel flow electron gun comprises a vacuum tube, a laser panel provided at one end of the vacuum tube and an electron gun provided at the opposing end. The electron gun adopts a parallel flow electron gun, wherein the parallel flow electron gun comprises a negative electrode, a G1 electrode and a control electrode, wherein the control electrode is connected to an electron beam current control system. The electron gun of the present invention adopts parallel flow electron gun to emit electron beam, so that the laser panel has even current density distribution so as to average the power consumption of laser panel to reduce the energy that is converted to heat.

Abstract: A projection display includes at least one light source, at least one reflective image generator configured to represent frames in a two-dimensional distribution of subareas of same, a projection optics arrangement having a two-dimensional arrangement of optical projection elements and being configured to image an associated subarea of the at least one image generator onto an image plane in each case, so that images of the frames superimpose within the image plane to form an overall picture, and at least one beam splitter arranged within an optical path between the at least one reflective image generator and the two-dimensional arrangement of optical projection elements, on the one hand, and the optical path between the at least one light source and the at least one reflective image generator, on the other hand.

Abstract: The polarization beam splitting element splits an entering beam according to polarization directions. The element includes, in order from a beam entrance side, an entrance side multi-layered film layer constituted by laminated multiple dielectric films, and a one-dimensional grating structure having a grating period smaller than a wavelength of the entering beam and formed of a metal. When a medium existing on the beam entrance side further than the entrance side multi-layered film layer is referred to as an entrance medium, the multiple dielectric films constituting the entrance side multi-layered film layer include at least one dielectric film having a higher refractive index than that of the entrance medium and at least one dielectric film having a lower refractive index than that of the entrance medium.

Abstract: A projector includes a projection lens set, a DMD, a prism unit, a light guide unit, and a light source device. The light source device includes a first and a second LEDs, a laser light source, and a color wheel. The first LED is positioned in a first optical path and generates a first light. The laser light source is positioned in a second optical path and generates a laser light. The second LED is positioned in a third optical path and generates a second light. The laser light irradiates the color wheel to generate a third light. A light merging unit merges the first, second, and third lights. The light guide unit guides the mixed light to the prism unit. The mixed light is refracted to the DMD via the prism unit. The refracted mixed light is reflected to the projection lens set via the DMD.

Abstract: An illumination optical system for a beam projector includes: a light source; a color conversion unit having at least one fluorescent substance layer that reflects a light from the light source or converts the light emitted from the light source to a wavelength-converted light; and a dichroic mirror that causes the light emitted from the light source to be incident on the color conversion unit. Lights reflected or emitted by the conversion unit and having different wavelengths are incident on a display panel through the same path. In the illumination optical system, a light emitted from one light source can be processed to produce red, green and blue lights which can be in turn incident on the display panel through the same optical path of the light reflected or emitted by the conversion unit.

Abstract: An image display apparatus for a viewer to view a two-dimensional image demonstrated on an image display device as an enlarged virtual image by a virtual-image optical system. The image display apparatus includes a prism and a reflective transmitting surface for reflecting or transmitting image light incident from an incident optical surface. The image display apparatus also includes a reflective optical component for reflecting image light reflected from the reflective transmitting surface and radiated from a first planar optical surface towards the reflective transmitting surface as a collimated light beam and a phase difference optical component arranged on a light path between the first planar optical surface and the reflective optical component to the state of polarization of the image light.