Abstract: A light source device includes a phosphor wheel, a light source, a color separating-and-mixing element, and a light-guide optics. The phosphor wheel includes a base plate having a first light passage area and a second light passage area as a pair of light passage areas being annularly and point symmetrically arranged with respect to a center of the base plate, a phosphor area annularly formed on the base plate, and a motor that rotates the base plate. The color separating-and-mixing element disposed between the light source and the phosphor wheel changes a direction of traveling of fluorescence created as a result of light having being incident on the phosphor area and been converted in wavelength. The light-guide optics is provided to cause light from the light source to travel through the first light passage area, then through the second light passage area, and finally enter into the color separating-and-mixing element.

Abstract: Device for an endoscopic illumination apparatus comprising a heat pipe having a first end region and a second end region; a first heat source; a heat dissipation element for dissipating thermal energy from said first heat source; a heat sink spaced apart from the first heat source; and a clamping element, wherein the clamping element is reversibly detachably mounted on the heat dissipation element such that the first end region of the heat pipe is held between the heat dissipation element and the clamping element, wherein the heat pipe is adapted to conduct the thermal energy of the heat source to the heat sink, wherein the second end region of the heat pipe is spaced apart from the first end region, and wherein the second end region ends in the heat sink.

Abstract: A cooling device is provided with an evaporator, a condenser, a vapor pipe, and a liquid pipe. The evaporator includes a housing having a reservoir configured to retain a working fluid in a liquid phase flowing inside, a wick disposed in the housing, and transporting the working fluid in the liquid phase, and a groove member having a plurality of flow channels through which the working fluid changed in phase from the liquid phase to the gas phase flows, the groove member being coupled to the wick. The wick has a plurality of through holes which penetrate the wick along a first direction from the reservoir toward the groove member, the through holes being configured to transport the working fluid in the liquid phase retained in the reservoir in the first direction.

Abstract: A light source unit of the invention includes a light source device including first and second light sources held by a holding member, each light source being configured to emit light in a predetermined polarizing direction, a first reflection device on which light from the first light source is incident, a second reflection device on which reflection light from the first reflection device and light from the second light source are incident, and a light source control device configured to selectively drive the first and second light sources in response to an input signal, and the first reflection device reflects light in the polarizing direction incident thereon from the first light source, while the second reflection device transmits light in the polarizing direction reflected by the first reflection device for incidence thereon and reflects light in the polarizing direction from the second light source for incidence thereon.

Abstract: According to one embodiment, a liquid crystal layer is provided between a first substrate and a second substrate. A switching element is provided on the first substrate. A pixel electrode is electrically connected to the switching element. A color filter is provided on a liquid crystal side of the second substrate and corresponds to the pixel electrode. A common electrode is provided on a liquid crystal side of the color filter. A light guide plate guides laser light incident on a side surface and emits the laser light from a main surface. A diffusion plate diffuses the laser light emitted from the light guide plate and applies the laser light to the first substrate. A supporting unit supports the diffusion plate. A vibration generation unit is provided in the supporting unit and vibrates the diffusion plate.

Abstract: Disclosed herein is a lens module for a projector of laser scanning type which is focus-free and has a short throw distance. In one example, a lens module includes a first optical member including a free-curved lens that passes a beam light reflected by a minute vibrating mirror; and a second optical member including a free-curved mirror to reflect the beam light which has passed through the first optical member, or a free-curved lens to pass the beam light which has passed through the first optical member. The beam light, which has been reflected by or has passed through the second optical member, has at the same position beam waists in horizontal and vertical directions perpendicular to a propagating direction of the beam light and also has beam radii coinciding in the horizontal and vertical directions.

Abstract: A visual sense-and-tactile sense integrated presentation device includes a half mirror, a visual sense presentation body that presents visual information about an object and is disposed on a mirror surface side of the half mirror, and a tactile sense presentation body that presents tactile information and is disposed to face the visual sense presentation body across the mirror surface of the half mirror at an optical distance from the half mirror equal to an optical distance between the half mirror and the visual sense presentation body.

Abstract: An abnormality detection unit according to the invention includes a processor, and a light source device configured to emit light for each of segment periods that are time divided within a frame, and the processor obtains an illuminance value of light emitted into the frame from the light source device after a predetermined delay time has elapsed, whereupon a segment period results where a highest illuminance value is obtained, from a timing of receiving a trigger signal that is in synchronism with the frame, and detects that the light source device is in an abnormal state, when the illuminance value is less than a predetermined threshold.

Abstract: The light source device of the projection display apparatus according to the present disclosure includes: solid-state light sources that individually emit blue light, green light, and red light; a plurality of dichroic mirrors that combine the blue light, the green light, and the red light having exited from the solid-state light sources; a first diffusion plate on which the combined light having been combined by the plurality of dichroic mirrors is incident; a dynamic diffusion plate that is disposed at a position at which the combined light having exited from the first diffusion plate converges and starts to diverge.

Abstract: Aspects of this disclosure relate to adjusting the lumen output of a light source. A system may include a light source, a pipe, and at least two light-obscuring elements within the pipe. The pipe may have an inlet port and an outlet port, where the inlet port is configured to be secured to the light source such that all lumens of the light source are directed through an inner passageway of the pipe to the outlet port. The light-obscuring elements may be configured to be moved to reduce a number of lumens of the light source that traverse through the pipe to the outlet port.

Abstract: Methods and apparatus for providing circadian-friendly LED light sources are disclosed. A light source is formed to include a first LED emission (e.g., one or more LEDs emitting a first spectrum) and a second LED emission (e.g., one or more LEDs emitting a second spectrum) wherein the first and second LED emissions are combined in a first ratio and in a second ratio such that while changing from the first ratio to the second ratio the relative circadian stimulation is varied while maintaining a color rendering index above 80.

Abstract: Head-mounted display systems and methods of operation that allow users to couple and decouple a portable electronic device such as a handheld portable electronic device with a separate head-mounted device (e.g., temporarily integrates the separate devices into a single unit) are disclosed. The portable electronic may be physically coupled to the head-mounted device such that the portable electronic device can be worn on the user's head. The portable electronic device may be operatively coupled to the head-mounted device such that the portable electronic device and head mounted device can communicate and operate with one another. Each device may be allowed to extend its features and/or services to the other device for the purpose of enhancing, increasing and/or eliminating redundant functions between the head-mounted device and the portable electronic device.

Abstract: An illumination unit includes a light source section, an optical-path branching device, a photodetector, a control section, and a light-quantity-distribution control device. The light source section includes a laser light source. The optical-path branching device outputs light incident from the light source section, by branching the light into an outgoing optical path of illumination light and other optical path. The photodetector receives a light flux that travels on the other optical path. The control section controls an emitted light quantity in the laser light source, based on a quantity of the light flux received by the photodetector. The light-quantity-distribution control device is disposed between the optical-path branching device and the photodetector on the other optical path. The light-quantity-distribution control device controls a light quantity distribution in the light flux to be incident upon the photodetector.

Abstract: A projector includes an exterior housing of the projector, a first cooling target, and a cooling apparatus provided in the exterior housing and cooling the first cooling target. The cooling apparatus includes a first compressor compressing an operating fluid in a gas phase, a condenser condensing the gas-phase operating fluid compressed by the first compressor into the operating fluid in a liquid phase, a first expander decompressing the liquid-phase operating fluid condensed by the condenser to change to the operating fluid in which the liquid phase and the gas phase are mixed with each other, and a first evaporator changing part of the liquid-phase operating fluid supplied from the first expander to the gas-phase operating fluid by using heat transferred from the first cooling target and discharging the gas-phase operating fluid to the first compressor.

Abstract: An LED lighting system for use in an indoor growing system. The lighting system includes a lighting tray having a tube containing a printed circuit board therein. The circuit board has blue and red LED lights. The LEDs draw power and at least one of the LEDs draws power of less than 1 Watts and may draw less than ½ Watt. The dispersion angle of the LEDs is less than 40° degrees and may be less than 30° degrees. The heat-sinking capabilities of a standard circuit board are sufficient without special metalized layers or external heat sinks. Additionally, conversion to low voltage power is achieved remotely in an area away from the lights. In the lighting system, the ratio of red to blue LEDs is 15-24% red to 76-85% blue.

Abstract: A light source unit includes a first light source for emitting light in a first wavelength range, a luminescent wheel including a second light source for emitting light in a second wavelength range and a third light source for emitting light in a third wavelength range whose wavelength differs from that of the light in the second wavelength range, which are disposed circumferentially end to end in an adjacent fashion, a fourth light source for emitting light in a fourth wavelength range similar in color system to the light in the second or third wavelength range, and a control unit for controlling the fourth light source and the luminescent wheel to illuminate the fourth light source during a first color mixing period when a boundary between the second and third light sources is situated on an optical path of the light in the first wavelength range.

Abstract: An illumination system and a projection device are provided. The illumination system includes first excitation light sources, an excitation light source module, a wavelength conversion element and a light combining element. The excitation light source module includes second excitation light sources adapted to emit second excitation light beams and third excitation light sources adapted to emit third excitation light beams. The excitation light source module has a first symmetric axis and a second symmetric axis perpendicular to each other, where the second excitation light sources and the third excitation light sources are respectively arranged symmetrically relative to the first symmetric axis, and the second excitation light sources and the third excitation light sources are respectively arranged symmetrically relative to the second symmetric axis. The projection device includes the illumination system, a light valve and a projection lens.

Abstract: A projection apparatus and an illumination system thereof are provided. The illumination system includes a light source device, a light homogenization device, an optical transmission module, and an optical wavelength conversion module. The light homogenization device is disposed on a transmission path of a light source beam from the light source device. The optical transmission module is disposed on a transmission path of the light source beam from the light homogenization device. The optical wavelength conversion module is disposed on a transmission path of the light source beam from the optical transmission module and is configured to convert a first portion of the light source beam into a converted light beam. The converted light beam and a second portion of the light source beam form an illumination light beam. The light homogenization device is disposed outside a transmission path of the illumination light beam.

Abstract: The present invention is directed to wearable display technologies. More specifically, various embodiments of the present invention provide wearable augmented reality glasses incorporating projection display systems where one or more laser diodes are used as light source for illustrating images with optical delivery to the eye using transparent waveguides. In one set of embodiments, the present invention provides wearable augmented reality glasses incorporating projector systems that utilize transparent waveguides and blue and/or green laser fabricated using gallium nitride containing material. In another set of embodiments, the present invention provides wearable augmented reality glasses incorporating projection systems having digital lighting processing engines illuminated by blue and/or green laser devices with optical delivery to the eye using transparent waveguides.

Abstract: An image acquisition device includes a spatial light modulator modulating irradiation light, a control unit controlling a modulating pattern so that first and second light converging points are formed in an observation object, a light converging optical system converging the irradiation light, a scanning unit scanning positions of the first and second light converging points in the observation object in a scanning direction intersecting an optical axis of the light converging optical system, and a photodetector detecting first observation light generated from the first light converging point and second observation light generated from the second light converging point. The photodetector has a first detection area for detecting the first observation light and a second detection area for detecting the second observation light. The positions of the first and second light converging points are different from each other in a direction of the optical axis.

Abstract: A projection apparatus and an illumination system are provided. The illumination system includes an excitation light source and a light wavelength conversion module. The excitation light source is adapted to provide an excitation beam. The light wavelength conversion module includes a first phosphor wheel and a second phosphor wheel. The second phosphor wheel is disposed adjacent to the first phosphor wheel, and the first phosphor wheel and the second phosphor wheel are respectively disposed on transmission paths of a first part and a second part of the excitation beam, such that during a period that the excitation light source is turned on, the first phosphor wheel and the second phosphor wheel are both irradiated by the excitation beam. The illumination system of the invention avails improving phosphor conversion efficiency and avoiding burning the phosphor powder. The projection apparatus has good performance.

Abstract: A projecting apparatus includes an illuminating system and a first sensing module. The illuminating system includes a light source module and a filter element. The first sensing module is disposed beside the filter element, and includes a first light emitter and a first light sensor. The first light emitter emits a first sensing light. Outside the transmission path of the light beam, a first and a second filter regions of the filter element are sequentially cut into a transmission path of the first sensing light. When the first filter region is cut into the transmission path of the first sensing light, the first light sensor generates a first sensing signal, and when the second filter region is cut into the transmission path of the first sensing light, the first light sensor generates a second sensing signal, and the first sensing signal is different from the second sensing signal.

Abstract: A wavelength-converting wheel has a light incident side. The wavelength-converting wheel includes a motor, a turntable, a wavelength-converting layer and a reflective element. The motor has a rotating shaft. The turntable has an inner ring portion and an annular irradiation portion. The inner ring portion is sleeved on the rotating shaft, the annular irradiation portion is connected to an outer edge of the inner ring portion, and the annular irradiation portion includes a light-reflecting region and a wavelength-converting region. The wavelength-converting layer is disposed in the wavelength-converting region and has a light receiving surface facing the light incident side. The reflective element is disposed in the light-reflecting region and has a reflective surface facing the light incident side. The light receiving surface is coplanar with the reflective surface or the light receiving surface is farther from the light incident side with respect to the reflective surface.

Abstract: A display device includes a screen having a plurality of pixels displaying an image. A projector includes a light source emitting a first light and a light converter configured to change an intensity of the first light with respect to each of the plurality of pixels so that the projector emits a conversion light. Each of the plurality of pixels of the screen includes a light receiving element configured to receive the conversion light and to generate a current proportional to an intensity of the conversion light. A light emitting element is configured to display the image based on the generated current.

Abstract: A light source apparatus includes a first light source configured to generate first light, a phosphor to be excited by the first light to generate second light, a second light source configured to generate third light, and a spectroscopic optical element configured to reflect the first light to the phosphor and to combine the first light reflected without being absorbed by the phosphor, the second light, and the third light with one another. The spectroscopic optical element has a first area and a second area. The first area has a spectral characteristic of reflecting the first light, of transmitting the second light, and of reflecting the third light. The second area has a spectral characteristic of transmitting the first light and the second light, and of reflecting the third light.

Abstract: A projection apparatus and a light source apparatus are provided. The light source apparatus includes at least one first light source, at least one second light source, a wavelength conversion device, and a filter device. The wavelength conversion device is disposed on a transmission path of the first light beam from the first light source, and converts the first light beam into a conversion light beam. The filter device corresponds to the wavelength conversion device and is disposed between the first light source and the wavelength conversion device and disposed between the second light source and the wavelength conversion device. The filter device allows the first light beam and the conversion light beam to pass through, and reflects the second light beam. The projection apparatus and the light source apparatus have favorable light source utilization efficiency.

Abstract: A light source device includes a light emitting element emitting light of a first wavelength band, a fluorescent wheel and a mirror. The fluorescent wheel includes a fluorescent area converting the light of the first wavelength band into fluorescent light and a reflection area reflecting the light of the first wavelength band. The minor reflects a component in a first polarization direction of the light of the first wavelength band and transmits a component in a second polarization direction orthogonal to the first polarization direction. The reflection area includes a reflecting surface and a polarization conversion layer including an optical axis and converts either the first or second polarization direction to another polarization direction. The optical axis of the polarization conversion layer is inclined by 45 degrees to a polarization direction of the light of the first wavelength band at an irradiation position thereof in the fluorescent wheel.

Abstract: A light source unit of the present invention includes a light emitting device emitting light having a characteristic in which emitted light travels in a predetermined direction in which a uniformity in intensity distribution relative to an axis of the emitted light is high and an unstable direction in which a uniformity in intensity distribution relative to the axis of the emitted light is lower than that in the predetermined direction, the unstable direction being at right angles to the predetermined direction, an intensity transforming lens formed to control the intensity distribution in the predetermined direction and on which the light emitted from the light emitting device is incident, and a superposition transforming optical device formed to control the intensity distribution in the unstable direction by dividing the intensity distribution into a plurality of directions and superposing divided intensity distributions one on the other.

Abstract: A HUD 100 includes a R light source 12r, a G light source 12g, and a B light source 12b; collimating lenses 13r, 13g, and 13b that are arranged forwardly of the light sources; fly-eye lenses 16 and 17 that are arranged side by side on an optical path of light that exits from the collimating lenses; a light modulation element 20 that, based on image information, performs spatial modulation on light that has passed through the fly-eye lenses; a projection optical system 50 that projects image light onto a projection surface 7, the image light acquired by the spatial modulation by the light modulation element; photodetection elements PD1 and PD2 that are fixed to a portion of the fly-eye lens 16; and an image light control unit 40B that controls a brightness distribution of the image light based on a brightness of light detected by each of the photodetection elements.

Abstract: A light source apparatus including a light source section including one or more solid light sources capable of emitting light of a predetermined wavelength band as incident light; a light outputting section including a light emitting body to be excited by incident light from the light source section and to emit visible light having a wavelength band longer than a wavelength of the incident light, the light outputting section being capable of emitting synthetic light containing light having the predetermined wavelength band and visible light from the light emitting body; and a housing holding the light source section and the light outputting section, the housing including an inlet and an outlet formed not to face a light path of the incident light from the light source section to the light outputting section.

Abstract: A color wheel includes a base substrate and at least one fluorescent block. The base substrate includes a first annular portion and a second annular portion. The at least one fluorescent block is arranged on the first annular portion. The fluorescent block is configured to emit fluorescent light in a predetermined wavelength band after being irradiated with a laser beam. The second annular portion includes at least one color filtering portion, and the color filtering portion is configured to filter the fluorescent light. An inner circumference of the second annular portion is not smaller than an outer circumference of the first annular portion, or an outer circumference of the second annular portion is not larger than an inner circumference of the first annular portion.

Abstract: According to one embodiment, a display device includes a display panel and a conversion circuit. The display panel is with a first pixel including subpixels of red, first green which is tinged red as compared to a reference green, and blue, and a second pixel including subpixels of red, second green which is tinged blue as compared to the reference green, and blue, where the first pixel and the second pixel are arranged alternately. The conversion circuit is configured to generate a four primary color image of red, first green, second green, and blue from a three primary color image of red, reference green, and blue and to perform rendering the first image and the second image from the four primary color image.

Abstract: A projector includes a light source, an optical engine module, and a projection lens. The light source is configured for providing an illumination beam. The optical engine module includes a light valve, a casing, and a heat conducting structure. The light valve is configured to convert the illumination beam into an image beam. The light valve has a front portion and a rear portion opposite to each other. The casing is connected to the front portion. The heat conducting structure is disposed on the casing and at at least one side of the front portion. The projection lens is disposed on the casing and configured to project an image. The heat conducting structure is configured to dissipate heat of the casing and the front portion of the light valve.

Abstract: A light source apparatus includes a light emitting element configured to emit light having a first wavelength band, a polarization separation element configured to separate the light having the first wavelength band into a first linear polarization light and a second linear polarization light having polarization directions different from each other, a wavelength conversion element configured to convert the first linear polarization light into a third linear polarization light having a wavelength band different from the first wavelength band, and a combination element configured to combine the second linear polarization light and the third linear polarization light with each other. Light from the light source apparatus maintains a polarization state and illuminates a light modulation element via an illumination optical system.

Abstract: [Solving Means] A composite-optical-system unit includes a polarization beam splitter and a thermal conduction member. The polarization beam splitter includes a first prism including a first surface, a second prism including a second surface having an area different from an area of the first surface, and an overlap interface on which the first surface is attached to and overlaps the second surface. The thermal conduction member is thermally connected to a connection region being a region other than the overlap interface of the first surface or the second surface having an area larger than an area of the other surface.

Abstract: A phosphor wheel of a first exemplary embodiment in the present disclosure includes a base plate, an annular phosphor provided on the base plate, and a reflective coating provided on a partial area of the annular phosphor. Further, a phosphor wheel of a second exemplary embodiment includes a base plate, an annular phosphor layer that is provided on the base plate and constituted by a plurality of phosphor segments, and a reflective coating provided on a partial area of the annular phosphor layer.

Abstract: A sound processing method includes: executing a time frequency conversion process; executing a noise level evaluation process; executing a bandwidth controlling process; executing a sound source direction decision process; executing a gain setting process; executing a correction process; and executing a frequency time conversion process.

Abstract: A first projection display apparatus includes a color separator (41A) that has first and second incident surfaces (S1a and S1b), and allows light in first to third wavelength bands to pass therethrough or reflects the light in the first to third wavelength bands; first to third reflective light modulators (15); a first polarization splitter (12G); a second polarization splitter (12RB); and a projection optical system (19). Light in at least one of the first to third wavelength bands enters the first incident surface of the color separator as first polarized light, and light in the other wavelength bands enters the second incident surface of the color separator as second polarized light orthogonal to the first polarized light.

Abstract: A projection display apparatus includes a light valve that modulates illuminating light on the basis of image data to output the modulated light, an illuminating unit including a light source, and a plurality of optical members for illumination that generate the illuminating light on the basis of light from the light source to guide the illuminating light to the light valve, a projection lens that projects the modulated light from the light valve on a projection surface, and allows detection light to enter from a direction opposite to a travelling direction of the modulated light, and an imaging device that is disposed at a location optically conjugated with the light valve, and allows the detection light to enter through the projection lens. The plurality of optical members for illumination have optical property of reducing a noise component that affects the detection light and arises inside the illuminating unit.

Abstract: An illumination system including a first excitation light source, a wavelength conversion element, and a scattering element is provided. The first excitation light source emits a first excitation beam. The wavelength conversion element includes a wavelength conversion material. The wavelength conversion element has a first region and a second region. A concentration of the wavelength conversion material in the first region is greater than a concentration of the wavelength conversion material in the second region. The scattering element is disposed on a transmission path of the first excitation beam. A projection apparatus with the illumination system is also provided.

Abstract: The invention provides a wavelength conversion device, including a first wavelength conversion portion and a second wavelength conversion portion. The second wavelength conversion portion includes a wavelength maintenance zone and a plurality of wavelength conversion structures. When the second wavelength conversion portion is switched onto a transmission path of the excitation beam, a portion of the excitation beam is incident on the wavelength maintenance zone and becomes a second color beam, and another portion of the excitation beam is incident on the wavelength conversion structures and converted into a predetermined color beam. A first chromaticity coordinate value of the second color beam in color space is (x, y), a second chromaticity coordinate value of the second color beam, after being combined with the predetermined color beam by the dichroic element, in the color space is (x?, y?), and x??x and y??y.

Abstract: Various embodiments of lightguides and illumination systems that include lightguides are disclosed. In one or more embodiments, a lightguide can include first and second light extractors (330,340) that extract light that would otherwise be confined and propagate within the lightguide along the length of the lightguide primarily by total internal reflection. The first and second light extractors can form respective first and second patterns along a length of the lightguide. Light extracted by the first light extractors can exit the lightguide primarily along a first direction (306). Light extracted by the second light extractors can exit the lightguide primarily along a second direction (308) different from the first direction. A brightness of the total light extracted by the first light extractors can be larger than a brightness of the total light extracted by the second light extractors.

Abstract: A projection-type display device, provided with: a reflection-type image display element (DP), in which illumination light is reflected at an image display surface so as to be converted to image light and emitted; a prism unit (PU1) that bends a light path of the illumination light and transmits image light; and a projection lens system (PO) that projects the image light transmitted through the prism unit onto a screen. The prism unit (PU1) has an air gap (AG) that is disposed obliquely with respect to the main light rays of the image light emitted from the center of the image display surface. At least one lens (DL) in the projection lens system (PO) is eccentric in relation to the optical axis of the projection lens system (PO) so that comatic aberration produced when the image light is transmitted through the air gap (AG) will be canceled out.

Abstract: To provide an image projection apparatus that is able to efficiently cool an inside of a housing. There is provided an image projection apparatus including: an air intake port that is provided in a housing and through which air is caused to flow into an inside of the housing; and an air discharge port that is provided in the housing and through which air inside the housing is discharged. The image projection apparatus includes an air exhaust flow path in which air that has flowed into the inside of the housing from the air intake port is caused to pass through a heat generation component having a highest temperature, at an end of the passing through, among a plurality of heat generation components provided inside the housing, and is discharged from the air discharge port.

Abstract: The projection display unit includes an illumination section including one or a plurality of light sources, a light valve that modulates light emitted from the illumination section and outputs the modulated light, a projection lens section that projects the light outputted from the light valve onto a projection surface, a light-receiving section including an imaging device that receives light incident via the projection lens section, and an optical device that allows for splitting into respective optical paths that pass through the illumination section, the light valve, and the light-receiving section. A first range corresponding to a portion of a pupil range of the projection lens section is assigned for projection, and the light-receiving section includes a light-shielding part that performs light-shielding of a selective part corresponding to the first range, at a position substantially optically conjugate with respect to an aperture of the projection lens section.

Abstract: The projection type display device includes a projection display unit that includes light sources, a light modulation element that spatially modulates light emitted from the light sources, and a projection unit that projects light spatially modulated by the light modulation element onto a projection surface; a sight line detection unit that detects a line of sight; and a system controller that stops projection of the projection light onto the projection surface by the projection display unit in a state where the line of sight detected by the sight line detection unit is out of the projection surface and restarts the projection of the projection light onto the projection surface by the projection display unit after a first time elapses after a timing of moment when the line of sight is determined to move from an outside of the projection surface to an inside of the projection surface.

Abstract: A display device includes a screen, first and second projectors, and a controller. The screen has first and second surfaces. The first projector projects a first horizontally non-inverted image as viewed from the first surface. The second projector projects a second horizontally non-inverted image as viewed from the second surface. The controller controls switching of an operation between the first and second projectors.

Abstract: A lighting apparatus is provided with a light source unit including laser diode elements, a collimating lens, and at least one optical element changing only a predetermined one-axis direction of a traveling direction of the substantially parallel light. When the substantially parallel light is incident on a first surface of the optical element, the optical element reflects the substantially parallel light by a second surface to change only the one-axis direction of the traveling direction of the substantially parallel light, and emits an inclined light flux inclined from the substantially parallel light. An aspect ratio of a screen configured by spot lights from the light source unit is changed to an aspect ratio on a cross section of a predetermined position in a traveling direction of the inclined light flux.

Abstract: A wavelength conversion element according to an aspect of the invention includes a base having a reflection surface, a wavelength conversion section that has a first surface on which excitation light is incident and a second surface facing away from the first surface and converts the excitation light in terms of wavelength into fluorescence, and a bonding section that bonds the wavelength conversion section to the base. Bonding the wavelength conversion section to the base via the bonding section with the reflection surface and the second surface separate from each other provides an air layer in part of the space between the reflection surface and the second surface, and at least part of a portion of the first surface that is the portion facing the air layer is a light incident area on which the excitation light is incident.

Abstract: A projector including a light source device configured to emit light, a light modulator configured to modulate the light emitted from the light source device in accordance with an image signal, a projection optical device configured to project the light modulated by the light modulator, and a cooler configured to cool a cooling target based on transformation of a refrigerant into a gas. The cooler includes a refrigerant generator configured to generate the refrigerant and a refrigerant sender configured to send the generated refrigerant toward the cooling target. The refrigerant generator includes a flow passage section through which the refrigerant flows. A portion of the inner surface of the flow passage section that is the portion facing the lower side in the gravity direction inclines with respect to the horizontal plane perpendicular to the gravity direction.