Abstract: The zoom lens consists of, in order from an object side, a first lens group having a positive power, a second lens group having a negative power, a third lens group having a positive power, a fourth lens group having a negative power, and a fifth lens group having a positive power. An aperture diaphragm is disposed between a surface of the second lens group closest to an image side and a surface of the fourth lens group closest to the object side. The first lens group and the fifth lens group each consist of two or less lenses. A negative meniscus lens, which is convex toward the object side, is disposed to be closest to the object side of the second lens group. A negative meniscus lens, which is convex toward the image side, is disposed to be closest to the image side of the fourth lens group.

Abstract: An imaging lens includes first, second, third, and fourth lens elements arranged from an object side to an image side in the given order. The first lens element has an image-side surface with a concave portion in the vicinity of its periphery. The second lens element has an image-side surface with a convex portion in the vicinity of the optical axis. The third lens element has a positive refractive power. The imaging lens does not have any lens element with refractive power other than the first, second, third, and fourth lens elements.

Abstract: A compact low-profile low-cost imaging lens with a small F-value which offers a wide field of view and corrects aberrations properly. Its elements are spaced from each other and arranged from an object side to an image side as follows: a first positive lens having a convex object-side surface; a second negative lens; a third positive or negative lens; a fourth positive or negative lens; a fifth positive or negative lens; a sixth positive or negative lens; and a seventh lens as a double-sided aspheric lens having a concave image-side surface. The third to sixth lenses each have at least one aspheric surface. The aspheric image-side surface of the seventh lens has a pole-change point off an optical axis. The imaging lens satisfies a conditional expression ?1.0<f1/f2<?0.15, where f1 denotes focal length of the first lens, and f2 denotes focal length of the second lens.

Abstract: There are provided a subminiature optical system having a miniature size and capable of obtaining a narrow view angle using only five sheets of lenses, and a portable device having the same. The subminiature optical system includes a first lens convex toward the object side and having positive refractive power, a second lens concave toward an image side and having negative refractive power, a third lens convex toward the object side and having positive refractive power, a fourth lens concave toward the image plane and having negative refractive power, and a fifth lens convex toward the image plane and having negative or positive refractive power, sequentially from an object side.

Abstract: An optical imaging lens assembly includes, in order from an object side to an image side, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element and a sixth lens element. The second lens element has positive refractive power. The third lens element has positive refractive power. The fourth lens element has positive refractive power. The fifth lens element has positive refractive power. The sixth lens element has an image-side surface being concave in a paraxial region thereof, wherein the image-side surface of the sixth lens element has at least one inflection point. The to optical imaging lens assembly has a total of six lens elements.

Abstract: An optical lens includes a first lens group with negative refractive power, a second lens group with positive refractive power, and an aperture stop disposed between the first lens group and the second lens group. A number of lenses with refractive power of the first lens group is smaller than three, and a number of lenses with refractive power of the second lens group is smaller than five. The second lens group has a lens with a diffractive optical surface, and the lens with a diffractive optical surface satisfies the condition: 0<|(?d*V)/?r|<2, where ?d denotes refractive power of the diffractive optical surface, ?r denotes refractive power of the lens, and V denotes an Abbe number of the lens with a diffractive optical surface.

Abstract: A photographing optical lens system includes at least six lens elements, wherein the photographing optical lens system includes at least one cemented lens group cemented by two of the lens elements adjacent to each other. The at least one cemented lens group includes, in order from an object side to an image side, a first cemented lens element, a cemented layer and a second cemented lens element. The first cemented lens element has a cemented image-side surface being aspheric. The cemented layer has a cemented object-side surface and a cemented image-side surface. The second cemented lens element has a cemented object-side surface being aspheric. An aspheric coefficient of the cemented image-side surface of the first cemented lens element is different from an aspheric coefficient of the cemented object-side surface of the second cemented lens element. One of the lens elements closest to an imaged object has positive refractive power.

Abstract: A single-focus optical system includes a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, and a third lens unit having a positive refractive power. The first lens unit includes at least a first sub-unit, a second sub-unit, and a third sub-unit. The first sub-unit includes a negative lens component, the second sub-unit includes two meniscus lens components, and the third sub-unit includes a plurality of positive lens components. The third lens unit includes a front side sub-unit and a rear side sub-unit, and the front side sub-unit includes only a positive lens component. At the time of focusing, the first lens unit is fixed, the second lens unit is movable, and the rear side sub-unit is fixed.

Abstract: A wide-angle lens includes a first lens group, an aperture stop, a second lens group, and a third lens group. The first lens group has positive refractive power. The second lens group has negative refractive power. The third lens group has positive refractive power. The first lens group, the aperture stop, the second lens group, and the third lens group are disposed in order from the object side toward image side. The first lens group includes a negative lens and at least one cemented lens, the negative lens being disposed on most-object side and has a convex surface facing the object side. The following conditional expression is satisfied, 0.5<f1/f<1.0??(1) where f1 is a focal distance of the first lens group in a condition that infinite is in focus, and f is a focal distance of a whole system in the condition that the infinite is in focus.

Abstract: A four-element athermal lens includes four coaxially aligned lenses including a (i) first lens and, in order of increasing distance therefrom and on a same side thereof, (ii) a second lens, a third lens, and a fourth lens. The first lens and the second lens are positive lenses. The third and fourth lenses are negative lenses. The first lens, second lens, third lens, and fourth lens have equal respective refractive indices n1, n2, n3, and n4. A difference between (i) the maximum of n1, n2, n3, and n4 and (ii) the minimum of n1, n2, n3, and n4 being less than 0.05 in a free-space wavelength range. Refractive indices n1, n2, n3, and n4 have respective temperature dependences ? ? ? n 1 ? ? ? T , ? ? ? n 2 ? ? ? T , ? ? ? n 3 ? ? ? T , ? ? ? n 4 ? ? ? T .

Abstract: A low infrared absorbing lithium glass includes FeO in the range of 0.0005-0.015 wt %, more preferably 0.001-0.010 wt %, and a redox ratio in the range of 0.005-0.15, more preferably in the range of 0.005-010. The glass can be chemically tempered and used to provide a ballistic viewing cover for night vision goggles or scope. A method is provided to change a glass making process from making a high infrared absorbing lithium glass having FeO in the range of 0.02 to 0.04 wt % and a redox ratio in the range of 0.2 to 0.4 to the low infrared absorbing lithium glass by adding additional oxidizers to the batch materials. A second method is provided to change a glass making process from making a low infrared absorbing lithium glass to the high infrared absorbing lithium glass by adding additional reducers to the batch material. In one embodiment of the invention the oxidizer is CeO2. An embodiment of the invention covers a glass made according to the method.

Abstract: A lens system having, in order from an object, at least a first lens group G1 having positive refractive power, and second to fourth lens groups G2 to G4, wherein the first lens group G1 includes a front portion lens group G1a, and a rear portion lens group G1b which is disposed to an image side of the front portion lens group G1a with an air distance therebetween, and performs focusing by shifting the rear portion lens group G1b in the optical axis direction, and the fourth lens group G4 includes, in order from the object, a negative lens and a positive lens (cemented negative lens L41), a negative lens L42, and an aperture stop S, and is fixed in the optical axis direction with respect to an image plane I upon zooming from a wide angle end state to a telephoto end state.

Abstract: A single-focus optical system includes in order from an enlargement side, a first lens unit, and a second lens unit having a positive refractive power. A lens component is one of a single lens and a cemented lens. The first lens unit includes a reduction-side negative lens component closest to the reduction side, and in addition, the first lens unit includes not less than three negative lens components including the reduction-side negative lens component. The second lens unit includes in order from the enlargement side, a first positive lens, a second positive lens, a first negative lens, and a third positive lens, and all airspaces in the second lens unit are constant at a time of focusing.

Abstract: The zoom lens comprises five or more groups of lens pieces, namely, the foremost or first lens group of positive refractive power located the closest to an object, the succeeding second lens group of negative refractive power, the third lens group of positive refractive power, the fourth lens group of positive refractive power, and the fifth lens group all arranged in this order, and if any, the rearmost lens group(s) closer to the imaging plane than the fifth lens group. The zoom lens meets requirements as defined in the conditional expression regarding a combined magnification of the fifth lens group and, if any, the rearmost lens group(s) closer to the imaging plane than the fifth lens group while the zoom lens is taking a telephoto position.

Abstract: A zoom image pickup apparatus includes a mount portion, a zoom lens which forms an image of light incident from the mount portion, and an image pickup element which is disposed at an image forming position, wherein the zoom lens includes in order from an object side, a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, a third lens unit having a positive refractive power, a fourth lens unit having a negative refractive power, and a fifth lens unit having a positive refractive power, and the fourth lens unit is a focusing lens unit, and at the time of zooming from a wide angle end to a telephoto end, only the second lens unit and the fourth lens unit move, and the following conditional expression (1) is satisfied: ?L1<?3GL1??(1).

Abstract: Accommodating (re-focusable) macro lens system which includes first and second individual lenses having first and second optical portions sequentially disposed along an optical axis. Change in optical-power of macro lens results from by changing the flattened area of contact between the lenses in response to force applied to the lenses axially by an external compressor operably connected with or forming a part of macro lens housing. Method for operating same.

Abstract: A system includes an optical waveguide configured to receive multispectral radiation from a scene, a first optical component and a second optical component. The first optical component is configured to cause a first portion of the multispectral radiation with wavelengths in a first range to exit the optical waveguide at a first position, and a second portion of the multispectral radiation with wavelengths in a second range to travel through the optical waveguide from the first position to a second position via total internal reflection. The second optical component is configured to cause the second portion of the multispectral radiation to exit the optical waveguide at the second position.

Abstract: A scanning microscopy system includes a photodetector and a scanning optical system that irradiates light onto a plurality of spots on an observed object to scan the observed object such that a positional relationship between an image of the observed object and the photodetector is maintained. The scanning optical system includes a confocal plate in which a plurality of apertures are placed in order in an intermediate image plane situated between the observed object and the photodetector and that includes a lens array having a plurality of lens elements that cover the plurality of apertures. The lens array individually demagnifies intermediate images of the plurality of spots that are formed or that have been formed in the plurality of apertures such that each of the plurality of spots is projected onto the photodetector at a magnification lower than a magnification at which the observed object is projected onto the photodetector.

Abstract: Systems and methods for capturing a digital image of a slide using an imaging line sensor and a focusing line sensor. In an embodiment, a beam-splitter is optically coupled to an objective lens and configured to receive one or more images of a portion of a sample through the objective lens. The beam-splitter simultaneously provides a first portion of the one or more images to the focusing sensor and a second portion of the one or more images to the imaging sensor. A processor controls the stage and/or objective lens such that each portion of the one or more images is received by the focusing sensor prior to it being received by the imaging sensor. In this manner, a focus of the objective lens can be controlled using data received from the focusing sensor prior to capturing an image of a portion of the sample using the imaging sensor.

Abstract: An image generation apparatus includes a plurality of irradiators, and a control circuit. The control circuit performs an operation including generating an in-focus image of an object in each of a plurality of predetermined focal planes, extracting a contour of at least one or more cross sections of the object represented in the plurality of in-focus images, generating at least one or more circumferences based on the contour of the at least one or more cross sections, generating a sphere image in the form of a three-dimensional image of at least one or more spheres, each sphere having one of the circumferences, generating a synthetic image by processing the sphere image such that a cross section appears, and displaying the resultant synthetic image on a display.

Abstract: A three-dimensional shape measuring apparatus includes a light source, an optical sensor, and an imaging unit that images a sensor signal. The three-dimensional shape measuring apparatus includes: a storing unit that stores control information indicating a state of the three-dimensional shape measuring apparatus at a point in time of imaging, the control information being obtained in synchronization with the imaging of the sensor signal performed by the imaging unit; and an output control unit that controls a transfer timing of the control information stored in the storing unit in accordance with a transfer timing of image data obtained by the imaging unit so as to output the control information to an image transfer path in association with the image data.

Abstract: A microscope system includes: a stage on which a specimen is placed; a light emitting LED configured to emit illumination light for illuminating the specimen; an optical system configured to condense the illumination light emitted by the light emitting LED and irradiate the specimen with the illumination light; an input unit configured to receive an input of a light control signal that adjusts a light amount of the light emitting LED; and a control unit configured to control, when the light control signal is input from the input unit, the light amount of the light emitting LED to become a light amount according to the light control signal by delaying the light control signal by a predetermined time from timing when the light control signal is input.

Abstract: The present invention concerns a method for generating a pattern of light, this method comprising the following steps: a) emitting an input laser pulse (P1), b) deflecting the input laser pulse (P1) by a first deflector (22) to obtain a first laser pulse, c) deflecting the first laser pulse (P3) by a second deflector (24) to obtain a second laser pulse (P4), and d) focusing the pulse (P4) by an optical element characterized in that: —the first deflector (22) shapes the first laser pulse (P3) according to a first function, —the second deflector (24) shapes the second laser pulse (P4) according to a second function, and—the first function f(x) and the second function g(y) are computed and/or optimized to obtain the desired pattern of light.

Abstract: The invention relates to a microscope slide holder for an optical microscope. The slide holder comprises a base portion, a slide holder portion arranged on the base portion and having a mounting zone capable of receiving microscope slides of one or more slide types, the slide holder portion being movably arranged on the base portion, and a manipulator for moving the slide holder portion with respect to the base portion in three orthogonal dimensions. According to the invention, the base portion is dimensioned to fit into a mounting zone designed for at least one of the one or more microscope slide types. The invention allows for convenient sample movement in microscopes whose sample stage is not inherently designed for scanning microscopy.

Abstract: An imaging unit includes: a solid state image sensor configured to receive light and perform photoelectric conversion on the light to generate an electric signal; a substrate extending from the solid state image sensor in an optical axis direction of the solid state image sensor; and a multi-layer substrate formed on a surface of the substrate, the multi-layer substrate having a plurality of electronic components mounted thereon and having a plurality of conductor layers and a plurality of via holes formed therein. At least one of the plurality of electronic components is embedded inside the multi-layer substrate. The plurality of via holes is formed on an outer side of the at least one of the plurality of electronic components embedded inside the multi-layer substrate along an optical axis direction of the multi-layer substrate.

Abstract: An image pickup system includes a light source apparatus, an objective optical system, an image pickup device, a judging portion configured to judge: an object is observed in which of a distant view and a near view, and an image pickup control portion configured to set a reading mode of the image pickup device according to a judgment result of the judging portion. The light source apparatus is capable of sequentially emitting red light, green light and blue light. The image pickup control portion sets a single pixel reading mode when that the object is observed in the distant view is judged, and blue light is emitted from the light source apparatus, and sets to a pixel addition reading mode when that the object is observed in the distant view is judged, and red light is emitted from the optical apparatus.

Abstract: The examples herein relate to assembly techniques and structures for an electrowetting cell, e.g. a fluid lens, a fluid prism or a single cell that may support both variable lens and variable prism functions. The resulting cell structure, for example, may support both beam shaping and steering functions, e.g. supporting use of the same electrowetting cell structure for a wider variety of optical processing applications. The resulting cell may be used in combination with an optical/electrical transducer or an array of cells may be used with a transducer in systems for a various light input and/or output applications.

Abstract: A mirror driving device includes a rotating shaft, a first driving source, a mirror holder, a mirror, a rotating body, a guide, a moving mechanism, and a second driving source. The first driving source rotates the rotating shaft. The mirror holder is supported on the rotating shaft by a support shaft extending perpendicular to the rotating shaft and is rotatable about the support shaft. A holding part is provided at an edge of the mirror holder. The mirror holder is placed on the rotating body at a position located away from the support shaft. The guide is disposed at the holding part, and guides the holding part so as to be capable of changing a distance between the holding part and the rotating shaft. The moving mechanism moves the rotating body in a direction parallel to the rotating shaft in a state where the rotating body is rotatable with the rotating shaft. The second driving source moves the rotating body via the moving mechanism.

Abstract: An image display apparatus includes a light source device including a light source unit; a scanning optical system including an image forming unit on which an intermediate image is formed by light from the light source unit; and a virtual image optical system configured to guide light of the intermediate image by using a reflecting mirror and a curved transmissive reflection member. The scanning optical system includes an optical scanning unit configured to scan the light from the light source unit in a main scanning direction and a sub-scanning direction of the image forming unit. The image forming unit is a transmissive member curved with a convex surface toward the reflecting mirror.

Abstract: An off-axis optical system having a rectangular aperture stop to control rays of incident electromagnetic radiation passing through the optical system along an optical path is provided. The optical system includes one or more optical surfaces along the optical path, each surface being configured to change a direction of each ray on the surface based on a location of the ray relative to the surface. At least one of the surfaces is conjugate to and has the same shape as the rectangular aperture stop. In one embodiment, each optical surface is shaped to avoid vignetting the rays. In one embodiment, the optical system is a three-mirror anastigmat (TMA) and includes a concave primary mirror to collect and focus the electromagnetic radiation; a curved secondary mirror to reflect the electromagnetic radiation focused by the primary mirror; and a concave tertiary mirror to focus the electromagnetic radiation reflected by the secondary mirror.

Abstract: An imaging adjustment apparatus includes: an imaging analysis module, used to determine whether a current image of an object is deformed relative to an original image of the object, and when the current image is deformed, generate imaging correction information corresponding to the deformation; an imaging lens group, used to image the object, and including a plurality of subregions having adjustable imaging parameters; and a lens adjustment module, used to adjust an imaging parameter of a corresponding subregion of the imaging lens group according to the imaging correction information. An object can be imaged by using an imaging lens in which each subregion has adjustable imaging parameters, so as to adjust the imaging parameters for each subregion separately, thereby adjusting and correcting a perspective deformation that occurs on the object, preventing a perspective deformation from occurring on an image of the object acquired by a user, and improving user experience.

Abstract: An optical instrument includes an optical system for producing an optical image; and a diffractive element which includes a surface having an array of diffractive units. The diffractive units include replications of a pattern of separated areas which produce diffractive interference of light and generate an array of exit pupils to be viewable as a single, continuous enlarged exit pupil The areas include irregular features of different sizes in horizontal and vertical section, which have curved surfaces at lateral faces The diffractive units are disposed progressively radially outwardly from the optical axis of the diffractive element and configured progressively with an increasing angular offset. Independent of location on the aperture of the diffractive element and without any relay lens arrangement, light from the received image is relayed to a common region on a viewing plane across the aperture.

Abstract: Aspects of the present invention relate to methods and systems for imaging, recognizing, and tracking of a user's eye that is wearing a HWC. Aspects further relate to the processing of images reflected from the user's eye and controlling displayed content in accordance therewith.

Abstract: A glazing for information display includes an assembly of two transparent inorganic or plastic sheets, connected together by a thermoplastic or adhesive interlayer or by multilayer sheets incorporating the interlayer, wherein a luminophore material is incorporated to enable the display. One of the luminophores includes a benzene ring substituted at least by: a first ester —COOR group, wherein R is a linear or branched carbon-based group including a main carbon-based chain of at least six consecutive carbon atoms, the R group including, if the chain is linear, more than 10 carbon atoms and, if the chain is branched, at least 7 carbon atoms, optionally a second —COOR? group, wherein R? is another hydrocarbon-based group or hydrogen, the second group optionally being in para position on the benzene ring with respect to the first ester group, two hydroxyl —OH groups that are optionally in para position on the benzene ring.

Abstract: A head-mountable display device is provided including an image display device configured to be communicable with an input device and to display an operation image and an auxiliary image overlaid upon the operation image. The auxiliary image indicates three-dimensional positional information of a target object relative to an input operation surface of the input device.

Abstract: When an imaging apparatus (30) captures an image of a finger performing an operation on a visual confirmation screen (S2), an operation determining unit (73) of a computer display device (1) mounted on eyeglasses (10) determines the contents of the operation performed by the finger based on image data obtained by the imaging apparatus (30). A positional data generating unit (74) generates positional data of the finger based on the image data. Based on data concerning the determined contents of the operation performed by the finger, the generated positional data of the finger, and reference data concerning the visual confirmation screen stored in a storage unit (90), an input control unit (76) determines the contents of an inputted instruction corresponding to the operation performed by the finger, and controls an original screen to be displayed on an display apparatus (20) in accordance with the determined contents of the inputted instruction.

Abstract: Systems, devices, and methods for eyebox expansion by exit pupil replication in wearable heads-up displays (“WHUDs”) are described. A WHUD includes a scanning laser projector (“SLP”), a holographic combiner, and an exit pupil selector positioned in the optical path therebetween. The exit pupil selector is controllably switchable into and between N different configurations. In each of the N configurations, the exit pupil selector receives a light signal from the SLP and redirects the light signal towards the holographic combiner effectively from a respective one of N virtual positions for the SLP. The holographic combiner converges the light signal to a particular one of N exit pupils at the eye of the user based on the particular virtual position from which the light signal is made to effectively originate. In this way, multiple instances of the exit pupil are distributed over the eye and the eyebox of the WHUD is expanded.

Abstract: Aspects of the present invention relate to methods and systems for the see-through computer display systems with a wide field of view.

Abstract: A head mounted display that is mounted on the head of a user and used includes an irradiation unit that irradiates the eyes of the user with invisible light, a monitor that displays an image for the user to view wearing a glass for display that transmits visible light and reflects invisible light, an imaging device capable of capturing an image formed by the invisible light, and an output unit that outputs an image captured by the imaging device as an image for gaze detection, and the imaging device images the eyes of the user using the invisible light radiated from the irradiation unit, reflected by the eyes of the user, and reflected by the glass for display.

Abstract: The present disclosure provides an optical imaging structure and virtual reality spectacles. In one embodiment, an optical imaging structure includes: an eyeglass component; and at least one light guide wall distributed along an edge of the eyeglass component, wherein, two opposite end faces of the at least one light guide wall are respectively a light incoming face and a light outgoing face; wherein, an inner rim of the light outgoing face joins the edge of the eyeglass component and extends in an optical axis direction of the eyeglass component, and, the light outgoing face is gradually distanced from the eyeglass component from the inner rim to an outer rim of the light outgoing face; and wherein, the at least one light guide wall includes a first light guide wall and a second light guide wall respectively disposed at left and right sides of the eyeglass component.

Abstract: An optical element includes a plurality of reflectivity variation partially reflecting mirrors and a light-transmittance member, and the plurality of reflectivity variation partially reflecting mirrors have a plurality of regions having different reflectivity in an inclination direction. The plurality of regions include at least a low reflectivity region positioned on a side far away from an emission surface and a high reflectivity region positioned on a side close to the emission surface. An occupation area of the high reflectivity region of the reflectivity variation partially reflecting mirror positioned far away from an incidence portion is larger than an occupation area of the high reflectivity region of the reflectivity variation partially reflecting mirror positioned on a side close to the incidence portion.

Abstract: An optical system for transmitting a source image is provided. Light having a field angle spectrum emanates from the source image. The optical system includes an optical waveguide arrangement, in which light can propagate by total internal reflection. The optical system also includes a diffractive optical input coupling arrangement for coupling the light emanating from the source image into the optical waveguide arrangement. The optical system further includes a diffractive optical output coupling arrangement for coupling the light that has propagated in the optical waveguide arrangement out from the optical waveguide arrangement. The disclosure also provides related methods.

Abstract: An auxiliary component unit for use with a head-mounted device is disclosed. The device can have a first side arm with and an extension arm extending at least partially therealong and configured to present information to the user via a display extending therefrom, a second side arm opposite the first side arm, and an external connection feature. The auxiliary component includes a first housing containing a first electronic component therein and a first attachment member extending from the first housing and configured to removably affix the auxiliary component with a portion of the second side arm of the head-mounted device. The auxiliary component also includes a wiring component in electronic communication with the first electronic component and attachable with the external connection feature of the device.

Abstract: A vehicle, a head-up displaying system and a method for adjusting a height of a projection image thereof are provided. The system includes a projector, a camera, a seat detecting module and a head-up controller. The camera is configured to detect an image having locations of the eyes of the driver and a predetermined reference point. The seat detecting module is configured to detect a position of a seat of the driver in the vehicle so as to obtain an actual horizontal distance between the eyes of the driver and the predetermined reference point. The head-up controller is configured to adjust a height of the projection image projected by the projector automatically according to the actual vertical distance. The system automatically controls the height of the projection image, and the projection image may be comfortable for the driver to view without any manual intervenes.

Abstract: A jewelry setting has a magnifying lens in a lens holder for supporting the magnifying lens. A precious stone arrangement is supported by a precious stone setting for supporting the precious stone arrangement below the magnifying lens, at such position relative to the magnifying lens as to produce a magnified image of the precious stone arrangement at a top surface of the magnifying lens. A mechanical coupling is configured to couple the precious stone setting to the lens holder. The setting can be implemented as any type of jewelry item, e.g. a finger ring, a necklace, a pendant and the like.

Abstract: In order to modulate different spectral components of a light beam independently of one another, the light beam is split into a plurality of spectral components which can be modulated at different locations of a spatial light modulator.

Abstract: The present disclosure provides a grating controlling method and apparatus, a grating, a display panel, and a 3D display device for achieving 3D displaying. The grating controlling method is applied to a grating, in which the grating cooperates with a display panel used for outputting left-eye images and right-eye images to achieve the 3D displaying. The grating controlling method may include: obtaining a current position of an eye of an observer who is observing 3D images; and adjusting slit positions of the grating according to the current position, so as to enable the left-eye images to be observed by the left-eye of the observer through the adjusted slits, while to enable the right-eye images to be observed by the right-eye of the observer through the adjusted slits.

Abstract: A system may comprise a selectively transparent projection device for projecting an image toward an eye of a viewer from a projection device position in space relative to the eye of the viewer, the projection device being capable of assuming a substantially transparent state when no image is projected; an occlusion mask device coupled to the projection device and configured to selectively block light traveling toward the eye from one or more positions opposite of the projection device from the eye of the viewer in an occluding pattern correlated with the image projected by the projection device; and a zone plate diffraction patterning device interposed between the eye of the viewer and the projection device and configured to cause light from the projection device to pass through a diffraction pattern having a selectable geometry as it travels to the eye.

Abstract: A retroreflecting display that enables the formation of a real image in free space includes a first light source that generates a first light output; a first beam splitter module; and a retroreflector module opposite the first light source.

Abstract: Devices, apparatus, systems and methods for making and using laser pointers and laser illuminators with reduced risk of optical sensor damage such as eye injuries due to laser radiation from the pointer or illuminator, while scattered beams from the laser pointer or laser illuminator are visible to the optical sensor.