Abstract: A near-eye display device comprises a pupil-expansion optic, first and second lasers, a drive circuit coupled operatively to the first and second lasers, a beam combiner, a spatial light modulator (SLM), and a computer. The first and second lasers are configured to emit in respective first and second wavelength bands. The beam combiner is configured to geometrically combine emission from the first and second lasers into a collimated beam. The SLM is configured to receive the collimated beam and to direct the emission in spatially modulated form to the pupil-expansion optic. The computer is configured to parse a digital image, trigger the emission from the first and second lasers by causing the drive circuit to drive current through the first and second lasers, and control the SLM such that the spatially modulated form of the emission projects an optical image corresponding to the digital image.

Abstract: The invention relates to methods for communicating within a communication system when re-configured from a source to a target uplink/downlink configuration. The invention is also providing mobile station for performing these methods, and computer readable media the instructions of which cause the mobile station to perform the methods described herein. Specifically, the invention suggests to perform PUSCH transmissions in response to Downlink Control Information, DCI, transmissions such that the source uplink/downlink configuration is applied to PUSCH transmissions relating to DCI transmissions received up to and including subframe N?6, a predefined uplink/downlink configuration is applied to PUSCH transmissions relating to DCI transmissions received during subframes N?5 to N?1; and the target uplink/downlink configuration is applied to PUSCH transmissions relating to DCI transmissions received from subframe N onward.

Abstract: A laser processing apparatus is used which includes: a laser oscillator that oscillates a processing laser beam at a processing point to be processed on a surface of a workpiece; an optical interferometer that emits a measurement beam to the processing point and generates an optical interference intensity signal based on interference generated due to an optical path difference between the measurement beam reflected at the processing point and a reference beam; a first mirror that changes traveling directions of the processing laser beam and the measurement beam; a second mirror that changes an incident angle of the measurement beam onto the first mirror; a lens that focuses the processing laser beam and the measurement beam on the processing point; a memory that stores corrected processing data; a control unit that controls the laser oscillator, the first mirror, and the second mirror based on the corrected processing data; and a measurement processing unit that derives a depth of a keyhole generated at the p

Abstract: Four of laser light source sections each includes a semiconductor laser. Any two of the laser light source sections are disposed in an imaginary plane perpendicular to the center axis of a luminous flux and on a first imaginary line that intersects with the center axis so as to face each other with the center axis sandwiched between the two laser light source sections, and other two of the laser light source sections are disposed on a second imaginary line perpendicular to the first imaginary line so as to face each other with the center axis sandwiched between the two laser light source sections. The laser light source sections are at the same distance from the center axis. The first light, the second light, the third light, and the fourth light are each linearly polarized light and have the same polarization direction.

Abstract: A projection apparatus and an illumination system that includes an excitation light source, a beam filter module, a wavelength conversion module and a homogenizing element are provided. The beam filter module includes a light effective region and is disposed on a transmission path of an excitation beam. The wavelength conversion module includes a wavelength conversion region and is disposed on a transmission path of the excitation beam reflected by the light effective region. The wavelength conversion region converts the excitation beam into a conversion beam. The conversion beam from the wavelength conversion module passes through the light effective region and then forms at least one color light. An optical axis of the excitation beam incident on the light effective region and a normal line of the light effective region are respectively not parallel to a central axis of the homogenizing element.

Abstract: In a first period, an optical apparatus converts first light that exits out of a retardation film into light polarized in a first polarization direction and converts second light that exits out of the retardation film into light polarized in a second polarization direction, and in a second period, the optical apparatus converts the first light that exits out of the retardation film into light polarized in the second polarization direction and converts the second light that exits out of the retardation film into light polarized in the first polarization direction.

Abstract: Provided is a structured light projector including a light source configured to emit light, and a nanostructure array configured to form a dot pattern based on the light emitted by the light source, the nanostructure array including a plurality of super cells each respectively including a plurality of nanostructures, wherein each of the plurality of super cells includes a first sub cell that includes a plurality of first nanostructures having a first shape distribution and a second sub cell that includes a plurality of second nanostructures having a second shape distribution.

Abstract: An illumination system, including a first light source for providing a first beam; a second light source for providing a second beam; a wavelength conversion element having a reflection region and a conversion region, wherein the reflection region is for reflecting the first beam and the conversion region is for converting the first beam into a third beam; a first light splitting element for allowing the second beam to pass; a second light splitting element for reflecting the first beam penetrated by the first light splitting element and allowing the second beam to pass, wherein the first light splitting element is disposed between the wavelength conversion element and the second light splitting element; and a light homogenizing element for receiving the first beam, the second beam, and the third beam, and generating an illumination beam, is provided. A projection apparatus including the illumination system is also provided.

Abstract: An ultrasonic generator includes an ultrasonic wave source and a converging portion. The converging portion includes a first reflecting portion which reflects the ultrasonic wave generated by the ultrasonic wave source on its first reflecting surface, a second reflecting portion which reflects the ultrasonic wave reflected by the first reflecting surface on its second reflecting surface, and a waveguide serving as a transmission path for the ultrasonic wave. The waveguide is disposed such that the ultrasonic wave reflected by the second reflecting surface is introduced through an introduction portion thereof. The focal point of the second reflecting surface and the focal point of the first reflecting surface are disposed such that the ultrasonic wave reflected by the second reflecting surface becomes a plane wave.

Abstract: An angular image of a scene may be displayed using a light field display. The light field display may comprise a plurality of projection units. Each of the projections units may comprise an imaging system and an optical system. The imaging system may illuminate pixels of a planar image of the scene. Light corresponding to each of the pixels may be directed towards the optical system. The optical system may comprise first and second lenses for redirecting each light beam corresponding to a pixel in different directions. In some embodiments the first and second lenses form a globe lens. A diffusion system may conceal the optical systems. Additionally, or alternatively, the diffusion system may produce a uniform distribution of light at a plurality of different viewing angles.

Abstract: A display apparatus comprises at least one spatial light modulator and at least one curved view angle control element that comprises plural retarders arranged between the display polariser of each spatial light modulator, and an additional polariser. The curvature of the view angle control element provides increased luminance uniformity for a head-on user and increased visual security to an off-axis snooper.

Abstract: An image projector includes a spatial light modulator (SLM) with a two dimensional array of pixel elements controllable to modulate a property of light transmitted or reflected by the pixel elements. An illumination arrangement delivers illumination to the SLM. A collimating arrangement collimates illumination from the SLM to generate a collimated image directed to an exit stop. The illumination arrangement is configured to sequentially illuminate regions of the SLM, each corresponding to a multiple pixel elements. A controller synchronously controls the pixel elements and the illumination arrangement so as to project a collimated image with pixel intensities corresponding to a digital image.

Abstract: The light source device includes a first solid-state light source array emitting a first color light, a second solid-state light source array emitting a second color light, a third solid-state light source array emitting a third color light, and a light combiner for combining the first to third color lights respectively from the first to third solid-state light source arrays into a combined color light, and emitting a light flux of the combined color light in the same direction. The third solid-state light source array requiring the lowest target cooling temperature among the first to third solid-state light source arrays is disposed on a first side, and the first and second solid-state light source arrays are disposed on a second side, with an optical axis of the light flux emitted from the light combiner, as a boundary.

Abstract: An article transport vehicle (3) includes: a travel portion (11) that travels to set positions (P1) that are set in one-to-one correspondence with a plurality of storage sections (1) that store articles; a supporting portion (12) that supports an article; an illumination portion (13) that emits light; and a control portion that controls the travel portion (11) and the illumination portion (13).

Abstract: A light source device includes: multiple light source units each including a light source to emit a first color light beam, each of the multiple light source units configured to: convert at least part of the first color light beam into a second color light beam emitted from an emitting region; and emit the second color light beam to form a conjugate image; and a light combiner to combine the conjugate images formed by the multiple light source units to form a combined image, in which the conjugate images partially overlap each other, on a plane of an entrance surface of a light uniformizing element along a central axis of the light uniformizing element. A conditional expression below is satisfied: 1.3>SC/SI>0.7 where SC is an area of the combined image, and SI is an area of the entrance surface of the light uniformizing element.

Abstract: A laser projector includes a laser source, a first dichroic mirror, a wavelength conversion module, a second dichroic mirror, a first, a second and a third light valves and a beam combiner. The laser source is for providing a blue beam including a first portion and a second portion. The first dichroic mirror is for receiving and allowing the blue beam to penetrate. The wavelength conversion module is for receiving the first portion and emitting a yellow beam to the first dichroic mirror. The second dichroic mirror is for receiving and separating the yellow beam reflected by the first dichroic mirror into a green and a red beam. The first, second and third light valve are for receiving and modulating respectively the second portion of the blue beam, the green beam and the red beam. The beam combiner is for the beams to form a multi-color image.

Abstract: A projector includes a collimator lens, a, a light transmission component and a solid-state light source. Amounts of the dichroic lens and the solid-state light source are plural. The dichroic lens and the light transmission component reflect beams with specific wavelength, and allow passing of beams with other wavelength. The solid-state light source emits the beams to the corresponding dichroic lens. The projector utilizes the dichroic lens and the light transmission component to pass the beams with different base color uniformly through the first part and the second part of the collimator lens. The projector further includes a polarized lens, a reflection lens and a phase retardation unit. The phase retardation unit transforms polarization of the beams, and the polarized lens reflects some polarized beams and allows passing of other polarized beams to combine a plurality of alignment modules for providing uniform illumination.

Abstract: A wavelength conversion module is configured to receive an excitation beam. The wavelength conversion module includes a substrate and a wavelength conversion material arranged on the substrate. The substrate includes a ring-shaped light irradiation region, and the wavelength conversion material is annularly arranged on at least part of the ring-shaped light irradiation region. A first color light obtained through conversion when the excitation beam is incident to the wavelength conversion material of the ring-shaped light irradiation region in a first time sequence has a first light intensity, the first color light obtained through conversion when the excitation beam is incident to the wavelength conversion material of the ring-shaped light irradiation region in a second time sequence has a second light intensity, and the first light intensity and the second light intensity are different. In addition, a projection device is also provided.

Abstract: A phosphor wheel and a projection apparatus with the phosphor wheel are disclosed. A phosphor wheel includes a driving motor, a temperature interference element, a substrate and at least one light wavelength converting layer. The driving motor includes a motor body and a rotating member. The motor body drives the rotating member to rotate relative to the motor body along a rotation axis. The temperature interference element is connected with the rotating member and the substrate. The motor body drives the rotating member to rotate the temperature interference element and the substrate relative to the motor body. The substrate includes a first surface and a second surface disposed opposite to each other. The second surface is located between the first surface and the rotating member. The light wavelength converting layer is disposed on the first surface of the substrate.

Abstract: A high brightness light engine apparatus is disclosed, comprising at least one long red wavelength light source with a peak wavelength longer than 630 nm, at least one green wavelength light source and at least one blue wavelength light source. Furthermore, the long wavelength red light may be combined with short wavelength red light and green/blue lights into a co-axial light path by at least one beam combiner such as wedged dichroic mirror, X-plate dichroic mirror or a dichroic X-cube. A 3-channels/4-channels/5-channels light engine apparatus and a hybrid laser LED light engine apparatus are disclosed that comprises at least a long wavelength red light source, one blue light source, and one converted green light source, combined by a dichroic mirror together with a X-plate dichroic mirror, a wedged dichroic mirror or a dichroic X-cube without Etendue increase to achieve high brightness light engine output as high as 5000 lm.

Abstract: A wavelength conversion element includes a base plate and a plurality of wavelength conversion layers. The base plate has a plurality of wavelength conversion regions. The plurality of wavelength conversion layers are respectively disposed on the wavelength conversion regions. The wavelength conversion layers are sintered and connected together. The invention also provides a projection device having the wavelength conversion element and a manufacturing method of the wavelength conversion element. The wavelength conversion element of the invention can have good conversion efficiency and long service life, so that the projection device with the wavelength conversion element can provide a good image quality.

Abstract: An apparatus includes a first emitter configured to emit first color light, a second emitter configured to emit second color light, a plate configured to diffuse the first color light and the second color light, a first lens configured to collimate the diffused first color light, and a second lens configured to collimate the diffused second color light. A predetermined condition is satisfied.

Abstract: A method for calibrating a projection device for a head-mounted display includes scanning a light beam emitted by a light source over a scanning angle range by means of a reflection element such that the light beam deflected by the reflection element passes over a head-mounted display surface region of a deflection element arranged on a lens of the head-mounted display. The surface region has at least two adjustment markings arranged on the head-mounted display, each adjustment marking arranged at a specified position relative to the surface of the deflection element arranged on a lens of the head-mounted display. The method further includes determining in which scan setting of the reflection element the at least two adjustment markings are struck by the light beam.

Abstract: A second projector disposed so as to be opposed to a projection surface includes a projection section configured to project second image light on the projection surface on which a base image is displayed, and visibility of the base image on which the second image light is projected is made lower than in a state in which the second image light is not projected on the projection surface.

Abstract: The disclosure provides an illumination system and a projection device applying the illumination system. The illumination system includes a laser light source, a wavelength conversion module, and a spot region modulation module configured to shift a transmission path of a laser beam. When the wavelength conversion module rotates, the spot region modulation module moves, in a first period of time, the laser beam in a wavelength conversion region of the wavelength conversion module along a first shift path, so that the laser beam forms a first spot region in an irradiation region in the wavelength conversion region. The spot region modulation module causes, in a second period of time, the laser beam to form a second spot region in an irradiation region in a non-conversion region of the wavelength conversion module. A size of the first spot region is greater than a size of the second spot region.

Abstract: A light source unit includes a first light source configured to emit light in a first wavelength range, a second light source configured to emit light in a first wavelength range, a first dichroic mirror configured to reflect the light in the second wavelength range incident thereon at a first incident angle and transmit the light in the second wavelength range incident thereon at a second incident angle, which is different from the first incident angle, and a second dichroic mirror configured to reflect the light in the second wavelength range that has passed through the first dichroic mirror, wherein after having been reflected by the second dichroic mirror, the light in the second wavelength range is incident on the first dichroic mirror at the first incident angle to then be reflected by the first dichroic mirror.

Abstract: Embodiments of the present disclosure relate to a method for analyzing an imaging quality of an imaging system. The imaging system comprises a spatial light modulator. The spatial light modulator comprises pixel units arranged in an array. The method comprises obtaining a transmittance distribution function of the spatial light modulator based on a structural parameter of the pixel unit, wherein the structural parameter is an aperture ratio. The imaging quality analysis parameter of the imaging system is obtained based on the transmittance distribution function of the spatial light modulator. Then, the imaging quality of the imaging system is analyzed based on the imaging quality analysis parameter.

Abstract: A light source module configured to provide an illumination light beam is provided. The light source module includes first, second, third and fourth light source components and a heat sink structure. The first light source component emits red light. The second light source component emits first green light. The third light source component emits first blue light. The fourth light source component emits second blue light towards the second light source component. The second light source component converts the second blue light into second green light. The illumination light beam includes the red light, the first green light, the first blue light, and the second green light. The heat sink structure is connected to the first light source component and is connected to one of the second light source component and the fourth light source component. In addition, a projector having the light source module is also provided.

Abstract: A projection system, comprising a first light source which is an array light source, the first light source being divided into a plurality of illumination areas, and each illumination area may be independently controllable so as to generate a first illumination light field of which the brightness and darkness may be modulated; a second light source comprises an illumination unit and a light steering unit; the light steering unit redistributes illumination light emitted from the illumination unit to generate a second illumination light field of which the brightness and darkness may be modulated, wherein the first and second illumination light fields overlap to generate a combined light field. Also provided is a projection display method. The goal of simultaneously increasing image peak value brightness and lowering image dark field brightness is achieved, and a projection system that has a high contrast ratio is thus obtained.

Abstract: An illumination device, a projection system and operation methods thereof are provided. The illumination device includes a controller, a light source device, a phosphor wheel, a cooling device, and a temperature sensor. The light source device is configured to generate an illumination beam according to a light source control signal. The phosphor wheel is configured to convert the illumination beam into a conversion beam, adjust a rotation speed of the phosphor wheel according to a phosphor wheel control signal, and generate a rotation speed status signal. The temperature sensor is configured to sense a temperature value of the phosphor wheel to generate a temperature status signal. The cooling device is configured to adjust a cooling capacity according to a cooling control signal. The controller generates the cooling control signal according to the temperature status signal, the rotation speed status signal, and the light source control signal.

Abstract: A display and method for providing an image to an eye of a viewer is provided. The display comprises at least two projector assemblies. Each projector assembly comprises a light-guide optical element (LOE), and an image projector arrangement for generating a partial image and being deployed to introduce the partial image into the LOE for coupling out towards the eye of the viewer. The at least two projector assemblies cooperate to display the image to the eye of the viewer with partial overlap. The display further comprises a controller associated with the image projector arrangements and configured to reduce a pixel intensity of selected pixels in a region of partial overlap between the first and second part of the image so as to enhance a perceived uniformity of the image.

Abstract: A virtual image projection device that generates image light includes a light source that emits light; a microlens array that emits the light, which is emitted from the light source, as light having a predetermined angle distribution; an imaging lens that concentrates the light from the microlens array; a display unit that is irradiated with the light, which is concentrated by the imaging lens, to generate an image; and a projection unit that projects the image, which is generated by the display unit, as image light. The microlens array is disposed such that short side directions of lens cells do not line up straight.

Abstract: Provided is a device that displays a moving image with high dynamic range. A control unit controls drive of at least one of a light source unit, a phase modulation unit, or an intensity modulation unit in accordance with an image signal. The light source unit applies first illumination light to a phase modulation panel of the phase modulation unit, which modulates a phase of the first illumination light applied from the light source unit, divides second illumination light for each predetermined phase modulation pixel group of the phase modulation panel, and applies the second illumination light to the intensity modulation panel for each predetermined intensity modulation pixel group of the intensity modulation panel, and the intensity modulation panel modulates an intensity of the second illumination light applied from the phase modulation panel.

Abstract: A light source device includes a light source unit and a rotating wheel. The light source unit is configured to emit first blue light and second blue light. The rotating wheel includes a diffuser layer configured to diffuse and transmit the first blue light, and a phosphor layer configured to convert at least a part of the second blue light into yellow light.

Abstract: A projection module includes a light source, a reflective structure, and an optical structure. The light source emits laser light. The reflective structure includes a first reflective element and a second reflective element. The optical structure includes a first optical element and a second optical element. The reflective structure is disposed between the laser source and the optical structure. The first reflective element reflects a portion of the laser light towards the second reflective element, and transmits a remaining portion of the laser light towards the second optical element. The second reflective element reflects the laser light from the first reflective element towards the first optical element. The first optical element and the second optical element cooperatively project the laser beam towards an object.

Abstract: An illumination device according to the present disclosure includes: an illumination optical system that includes a first variable diaphragm and a second variable diaphragm, and that generates illumination light used for generation of an image by a pulse width modulation method on the basis of light from the light source; a luminance calculating section that calculates average luminance at least for each frame in an image signal; a gray-scale evaluation computing section that evaluates a gray-scale value in a screen for each display period of at least a unit gray-scale bit; a first aperture diameter determining section that determines an aperture diameter of the first variable diaphragm on the basis of the average luminance calculated by the luminance calculating section; and a second aperture diameter determining section that determines an aperture diameter of the second variable diaphragm on the basis of evaluation by the gray-scale evaluation computing section.

Abstract: Disclosed are dual-light-source, high dimming-ratio avionics displays with digital light processing projector technology for rendering a visual display from generated light. The dual light sources are directed towards a beam splitter adapted to pass a substantial portion of the light from the first light source and to reflect a minority portion of the light from the second light source. An image is rendered at a substantially transparent, selectively reflective substrate adapted to reflect light of a range of visible wavelengths toward a viewer of the displays.

Abstract: A projection device includes a first light-emitting component including a first light-emitting member, a first light-transmitting member, a first driving member and a first lens. The first light-emitting member is used for generating a linear light band; the first light-transmitting member is defined with a first linear light-transmitting region; the first driving member is fixedly connected with the first light-emitting member or the first light-transmitting member, and used for allowing the first light-emitting member and the first light-transmitting member to generate a relative motion, and allowing the linear light band to intersect with the first linear light-transmitting region; and the first lens, the first light-emitting member, the first light-transmitting member and the first lens are sequentially arranged. The projection device of the present disclosure is capable of generating the dynamic meteor effect to improve the user experience.

Abstract: An optical display device includes a plurality of emitters configured to emit electromagnetic radiation in a main emission direction and at least one optical modulation unit which has an adjustable focal length. The emitters are arranged in a main plane and are separately controllable from one another. The optical modulation unit is arranged downstream of the emitters in the main emission direction. Images of the emitters are generated by means of the optical modulation unit, the images of the emitters each having a distance from the main plane which can be predetermined by means of the adjustable focal length. Methods of operating an optical display device are also disclosed.

Abstract: The disclosure relates to a device for providing a multi-colored light beam for a projector. The device comprises a first light source, a second light source, a waveguide element, a beam forming device and a structure element. The waveguide element forms a first waveguide for guiding light from the first light source, a second waveguide for guiding light from the second light source and a coupling out region for coupling light out of the first waveguide and the second waveguide. The beam forming device is designed to form the multi-colored light beam using the light coupled out of the coupling out region. The first light source, the second light source, the waveguide element and the beam forming device are arranged on the structure element.

Abstract: An illumination system includes a green light source, a red light source, a blue light source, and a thermoelectric cooler. The green light source includes multiple semi-conductor dies, and each of the semi-conductor dies has a power consumption of 8 W or larger. The thermoelectric cooler is thermally coupled to the red light source, and neither the green light source nor the blue light source is thermally coupled to a thermoelectric cooler.

Abstract: An illumination device includes a light emitting element emitting first light, wavelength conversion element converting the first light into second, first optical element, second optical element having a first area transmitting the second light, and second area transmitting part of the first light and reflecting another part, and third optical element having a third area transmitting the second light, and fourth area transmitting part of the first light and reflecting another part. The first area first light transmittance in the second optical element is higher than that in the second area, the second optical element position made switchable between first and second positions, the third area first light transmittance in the third optical element is higher than that in the fourth area, the third optical element position is made switchable between third and fourth positions, and the fourth area first light transmittance is different from that in the second area.

Abstract: A display system and a display method therefor, and a vehicle. The display system includes a display device and an image transmission device. The display device is configured to display a plurality of images; the image transmission device is configured to transmit light of at least two images of the plurality of images through different paths and to respectively form at least two virtual images corresponding to the at least two images of the plurality of images, and an imaging position of at least one of the at least two virtual images is variable.

Abstract: A projection system, comprising: a light-emitting apparatus for providing first light and second light emitted in a time sequence; a light-splitting system for dividing the first light into first primary color light and second primary color light, and dividing the second light into two paths of third primary color light; a spatial light modulator, comprising a first region and a second region, wherein the primary color light emitted along a first optical path enters the first region, and the primary color light emitted along a second optical path enters the second region; and an image processing apparatus for dividing, corresponding to the first region and the second region, image signals to be output into two groups, and changing the sequence of at least one of the groups so as to match the time sequence of primary color light received in a corresponding region.

Abstract: Techniques for displaying holograms in wearable display devices are described. An image source projects holographic images sequentially in three primary colors into a waveguide, where the images are modulated in amplitude and phase in spatial light modulator (SLM). Depending on implementation, the image source may be located next to the waveguide or an end of optical fibers, where the optical fibers are provided to transport the holographic images near the waveguide for projection thereof into the waveguide.

Abstract: An approach for projecting light may be implemented using a acousto-optical depth switch that uses surface acoustic waves produced along a substrate to guide image light to different areas. The surface acoustic waves may be generated on a substrate using a transducer. Surface acoustic waves of different frequencies can guide image light onto different optical elements at different physical positions. The optical elements may be configured to show objects in an image at different distances from a viewer.

Abstract: Different configurations of multi-faceted optical elements and associated methods are described that split an input optical beam into multiple output beams, and in a reverse configuration, combine a set of input beams into an output beam. One example multi-faceted optical element includes K optical facets, where K is greater than or equal to six, and K-2 internal surfaces. Each internal surface reflects at least a portion of the incident light and includes a coating designed to modify one or more of a spectral content, polarization, intensity or phase of the incident beam. The multifaceted optical element is configurable to either split an input light beam into four or more output light beams, or to combine four or more input light beams into a single output light beam. Such a multi-faceted optical element can be implemented as part of, for example, a display system, a multi-spectral camera or a polarization camera.

Abstract: A projector includes a first light source, a second light source, a collimating lens, a wavelength conversion module and a dichroic mirror. The first light source and the second light source respectively emit a first illumination beam and a second illumination beam. The collimating lens includes a first part and a second part and configured to receive and transmit the first illumination beam. The wavelength conversion module receives the first illumination beam from the first part, and generates an excitation beam transmitted toward the first part and the second part. The dichroic mirror corresponds to the first part, and configured to reflect the first illumination beam and the second illumination beam respectively to different directions for projecting the first illumination beam onto the first part and to be passed by the excitation beam.

Abstract: Illumination optical system (101) for outputting light to a projection lens, light source unit (102) for outputting light to illumination optical system (101), and dust-proof case (103) houses illumination optical system (101) and can be divided into two housings are provided, and the dust-proof case (103) has second positioning member (105-1), (105-2) provided on the outer surface of dust-proof case (103) and fitted to and first positioning member (104-1), (104-2) provided in light source unit (102), mounting seating surface (106) provided on the outer surface of the dust-proof case (103) for screwing light source unit (102), and pinching portion (107) for sandwiching a final optical member of light source unit (102) sandwiched between two housings.

Abstract: An eye tracking system for detecting position and movements of a user's eyes in a head-mounted display (HMD). The eye tracking system includes at least one eye tracking camera, an illumination source that emits infrared light towards the user's eyes, and diffraction gratings located at the eyepieces. The diffraction gratings redirect or reflect at least a portion of infrared light reflected off the user's eyes, while allowing visible light to pass. The cameras capture images of the user's eyes from the infrared light that is redirected or reflected by the diffraction gratings.