Abstract: The invention provides an illumination system, configured to provide an illumination beam. The illumination system includes blue, green, and red laser modules respectively configured to provide blue, green, and red beams and a wavelength conversion component. The wavelength conversion component includes a wavelength conversion region and an optical output region. In a first time interval, the blue, green, and red beams are sequentially transmitted to the optical output region, where the illumination beam includes the blue, green, and red beams. In a second time interval, the blue beam is transmitted to the wavelength conversion region to form a converted beam, where the illumination beam includes the converted beam. A projection device including the illumination system is also provided. The projection device using the illumination system in the invention achieves color performance of a wide color gamut at relatively low costs.
Abstract: Display systems, such as near eye display systems or wearable heads up displays, may include a laser projection system having an optical engine and an optical scanner. Light output by the optical engine may be directed into the optical scanner as two angularly separated laser light beams. The angularly separated laser light beams may overlap at an entrance pupil plane along a first dimension at a first scan mirror of the optical scanner, or at a location between the first scan mirror and an optical relay of the optical scanner. The angularly separated laser light beams may overlap at an exit pupil plane along the first dimension at a second scan mirror of the optical scanner or at an incoupler of the laser projection system.
Abstract: A light source apparatus 1 includes: a light emitter 2 having a plurality of laser diode devices 22 and packages 24 to hold the respective laser diode devices; a collimator 3 disposed on an optical path of a laser beam emitted from each of the laser diode devices; a focusing lens 5 disposed on a downstream side in a direction of an optical axis of each laser diode device relative to the collimator 3 and configured to condense the laser beams; a light guide 6 disposed on the downstream side in the direction of the optical axis relative to the focusing lens 5; and a magnification optical system 4 disposed between the collimator 3 and the focusing lens 5 to bring a beam diameter W?2-1 in a slow axis direction of the laser beam transmitted through the collimator 3 close to a beam diameter W?1-2 in a fast axis direction.
Abstract: A vehicle includes at least one side bay equipped with a window, and a device for displaying at least one item of information on the window. The display device includes an image projector fastened to a ceiling of the vehicle. The display device emits light rays. A system of at least one mirror is arranged to reflect light rays emitted by the image projector in the direction of the window.
April 5, 2021
Date of Patent:
August 16, 2022
ALSTOM Transport Technologies
Bastian Simoni, Alexandre Dubois, Michel Desjardins
Abstract: A structured beam generation device based on beam shaping and a method adopting the device are provided. Linearly polarized beam emitted by a laser sequentially passes through an electro-optic intensity modulator, a half-wave plate, and a first beam expander, and then enters a first polarization beam-splitting prism to be transmitted and reflected. The transmitted beam sequentially passes through a beam shaper, an optical delay line, and a first reflector to form a parallel ring-shaped beam to be transmitted by a second polarization beam-splitting prism. The reflected beam sequentially passes through an electro-optic phase modulator, a second reflecting mirror, and a second beam expander, and is then reflected by the second polarization beam-splitting prism and combined with the transmitted beam into a beam, which is then adjusted by a polarizing plate have consistent polarization direction, and is finally focused at a focal plane by a focusing lens for interference.
Abstract: A projection device is provided. An excitation light source of the projection device emits a first light beam incident to a light wavelength conversion wheel along a first direction. The light wavelength conversion wheel outputs the first light beam at a first timing, and converts the first light beam into a second light beam to be outputted at a second timing. The second light beam exits the light wavelength conversion wheel along a second direction. The first and second light beams sequentially penetrate a color filter wheel and a light homogenizing element, so that an illumination system outputs an illumination beam. The illumination beam is incident to a light valve along a third direction to be converted into an image beam. The image beam exits the light valve along a fourth direction. The first to fourth directions are different from each other and are located on a same plane.
Abstract: A light source unit includes a blue laser diode of an excitation light shining device for emitting light in a first wavelength range, a red light source of a red light source device for emitting light in a second wavelength range, a luminescent wheel including a wavelength transforming area for transforming the light in the first wavelength range into light in a third wavelength range differing in wavelength range from the light in the first wavelength range and the light in the second wavelength range and emitting the light in the third wavelength range and a transmitting area for emitting the light in the first wavelength range, the wavelength transforming area and the transmitting area being provided end to end in a circumferential direction, and a dichroic mirror configured to transmit one of the lights in the first and second wavelength ranges and reflect a remaining light.
Abstract: A wavelength converter according to the present disclosure includes a wavelength conversion layer having a first surface on which excitation light that belongs to a first wavelength band is incident and a second surface different from the first surface and converts the excitation light into fluorescence that belongs to a second wavelength band different from the first wavelength band, and a base so provided as to face the second surface. The base includes a first heat dissipation section so provided as to face a light incident area of the first surface that is an area on which the excitation light is incident and a second heat dissipation section the thermal conductivity of which in a first direction that intersects the first surface is lower than the thermal conductivity of the first heat dissipation section.
Abstract: A projector includes: a white light generator that uses a blue laser as a light source to generate blue light and yellow light based on the blue laser and generates white light including the generated blue light and yellow light; and an optical system that modulates light based on the white light generated by the white light generator with an image display element and projects the modulated light, wherein the white light generator includes: a dichroic mirror that is irradiated with the blue light from the blue laser as the light source; a first condenser lens that focuses blue light being reflected by or passing through the dichroic mirror; a diffusion plate that diffuses the blue light focused by the first condenser lens; a second condenser lens that focuses the blue light passing through or being reflected by the dichroic mirror; and a phosphor that emits yellow light.
Abstract: A lamp projecting a starry sky is provided. The lamp projecting the starry sky includes at least one beam generator, an interference filter configured to produce nebula effect, a reflecting mirror, and at least one first lens, the at least one beam generator is placed on a first side of the interference filter, the reflecting mirror is placed on a second side of the interference filter, the at least one first lens is located on an emergent light path of the interference filter; a light beam emitted from the interference filter forms a moving and layering nebula projection after passing through the at least one first lens. In the lamp, after multiple refractions, reflection and refraction, the light beam is magnified by the lens.
Abstract: A wavelength conversion element according to the present disclosure includes a substrate, a reflecting layer, a wavelength conversion layer which is disposed on the reflecting layer, and which is configured to convert light in a first wavelength band into light in a second wavelength band, a structure which is disposed on the wavelength conversion layer, and which is configured to scatter the light in the first wavelength band, and an optical layer which is disposed on the structure, and which is configured to reflect a part of the light in the first wavelength band, transmit another part of the light in the first wavelength band, and transmit the light in the second wavelength band, wherein the optical layer is different in reflectance with respect to the light in the first wavelength band in accordance with an incidence angle of the light in the first wavelength band entering the optical layer.
Abstract: A projector for illuminating a target area is presented. The projector includes an array of emitters positioned on a substrate according to a distribution. Each emitter in the array of emitters has a non-circular emission area. Operation of at least a portion of the array of emitters is controlled based in part on emission instructions to emit light. The light from the projector is configured to illuminate the target area. The projector can be part of a depth camera assembly for depth sensing of a local area, or part of an eye tracker for determining a gaze direction for an eye.
July 24, 2019
Date of Patent:
May 24, 2022
Facebook Technologies, LLC
Zhaoming Zhu, Mark Timothy Sullivan, Jonatan Ginzburg
Abstract: A projector includes an imaging section for generating imaging data obtained by taking an image of first light emitted by a first pointing member, second light emitted by a second pointing member, and a target range, and a position detection section for detecting a first position and a second position with respect to the target range based on the imaging data so as to be distinguished from each other, and the imaging section includes a sensor for outputting detection values of first colored light, second colored light, and third colored light to detect first infrared light and light with a first wavelength included in the first light, and second infrared light and light with a second wavelength different from the first wavelength included in the second light with the sensor.
Abstract: An information processing apparatus determines a plurality of sampling points in a range of a target object's silhouette having different specular reflectances in polarization images in a plurality of azimuths, extracts polarization luminance at the sampling points in question, and derives change in luminance relative to the polarization azimuth, thus acquiring, as a phase angle, the azimuth that provides the highest luminance. Then, the information processing apparatus evaluates a characteristic of the change in phase angle relative to the change in the specular reflectance, thus identifying a subject's surface roughness. Further, the information processing apparatus generates data to be output by performing a process according to the surface roughness and outputs the generated data.
Abstract: A lighting system and a projection device with enhanced functionality includes a light source in the lighting system for emitting first light, a first wavelength selection structure, and a second wavelength selection structure. The first wavelength selection structure includes a wavelength selection portion for transmitting the first light in a first target wavelength and a first light-transmitting portion for transmitting the first light. The light emitted then from the first wavelength selection structure is defined as second light. The second wavelength selection structure receives the second light and applies a supplementary portion for transmitting the second light in a second target wavelength and a second light-transmitting portion for transmitting the light. The light emitted from the second wavelength selection structure is adjustable as to colors, as to low or high color saturation, and as to low or high brightness of the projection image.
September 21, 2020
Date of Patent:
April 26, 2022
HONG FU TAI PRECISION ELECTRONS (YANTAI) CO., LTD., HON HAI PRECISION INDUSTRY CO., LTD.
Abstract: The present disclosure provides a time-of-flight camera, comprising a light-emitting module and a light-receiving module. The light-emitting module comprises a light source component, a light-reflecting component, and a light-diffusing component. The light source component emits a first light in a first direction. The light-reflecting component and the light-diffusing component are disposed on the light path of the first light. A second light formed by the first light passes through the light-reflecting component and the light-diffusing component. The second light travels toward a second direction to an object to be measured. The object to be measured reflects the second light. The first direction is intersecting with the second direction. The light-receiving module receives the reflected second light and performs the function of sensing.
Abstract: A laser illumination device and a projection system including the same. The laser illumination device includes a laser source, a light combining assembly, a micro-lens assembly, and a plurality of cylindrical lens assemblies; the plurality of cylindrical lens assemblies are provided in a light transmission path of the laser source; the micro-lens assembly is mounted at one side of the light combining assembly; each cylindrical lens assembly includes a first cylindrical lens array and a second cylindrical lens array; and the first cylindrical lens array and the second cylindrical lens array form a preset angle.
Abstract: A display apparatus includes an image forming device and a light guide. The light guide includes an incident portion and an emission portion including a plurality of mirrors. In the light guide, the total reflection surface is disposed to be inclined with respect to a virtual plane perpendicular to a visual axis, and the mirrors are disposed to be inclined with respect to the total reflection surface. The mirror angle is set such that the light guide angle, the mirror angle, the light angle, the limit incidence angle, and the refractive index of the light guide satisfy the predetermined relationship.
Abstract: A projector includes a light source, an optical element, a wheel-type optical assembly, a light valve, and a projection lens. The wheel-type optical assembly includes a frame, a driving unit, a rotating wheel, an optical sensing element, and a light shielding structure. The driving unit is arranged on the frame and connected to the rotating wheel. The driving unit drives the rotating wheel to rotate about a rotation axis. The optical sensing element arranged on the frame senses a rotation speed of the rotating wheel. The light shielding structure connected to the frame surrounds the optical sensing element. An orthographic projection of the light shielding structure on a reference plane partially overlaps an orthographic projection of the rotation axis on the reference plane. A normal line of the reference plane is parallel to a shortest connection line between an optical axis of the optical element and the rotation axis.
Abstract: A projector includes a selection section configured to select an interface to which an image signal to be displayed by the projector out of the plurality of interfaces is input, a determination section configured to determine whether or not the interface selected is a compliant interface capable of establishing daisy chain connection, and a function control section configured to make the transition of the projector to a state of preventing a daisy chain function from being executed when the interface selected is not the compliant interface, and when the daisy chain function which can be executed in a state in which the projector is coupled to another projector with the daisy chain connection is set available.