Abstract: A wavelength multiplexing device is disclosed. When light is irradiated on a first longitudinal end region of a metal nano-structure, surface plasmon polaritons are generated in the first longitudinal end region. The surface plasmon polaritons and the light are coupled with each other to form first coupled surface plasmon polaritons, wherein the first coupled surface plasmon polaritons propagate along and on a surface of the metal nano-structure. When the first coupled surface plasmon polaritons reach a two-dimensional material layer, excitons are induced in the two-dimensional material layer, wherein the induced excitons and the first coupled surface plasmon polaritons are coupled with each other to form second coupled surface plasmon polaritons. The second coupled surface plasmon polaritons propagate along and on a surface of the metal nano-structure toward a second longitudinal end thereof.

Abstract: There is provided an imaging lens with high resolution which effectively achieves low-profileness while maintaining the wide field of view, and favorably corrects aberrations. The imaging lens comprising a first lens having negative refractive power, a second lens having positive refractive power, a third lens, a fourth lens having positive refractive power, a fifth lens having negative refractive power as a double-sided aspheric lens, and a sixth lens as a double-sided aspheric lens, wherein the first lens has a concave surface facing the image side, and the aspheric surface on the image side of the sixth lens is formed as a concave surface near the optical axis and has at least one pole point at an off-axial point, and a below conditional expression (1) is satisfied: ??45°??(1) where ?: a half field of view.

Abstract: There is provided an imaging lens with high resolution which effectively achieves low-profileness while maintaining the wide field of view, and favorably corrects aberrations. The imaging lens comprising a first lens having negative refractive power, a second lens having positive refractive power, a third lens, a fourth lens having positive refractive power, a fifth lens having negative refractive power as a double-sided aspheric lens, and a sixth lens as a double-sided aspheric lens, wherein the first lens has a concave surface facing the image side, and the aspheric surface on the image side of the sixth lens is formed as a concave surface near the optical axis and has at least one pole point at an off-axial point, and a below conditional expression (1) is satisfied: ??45°??(1) where ?: a half field of view.

Abstract: Eyeglasses are provided capable of folding into a substantially flat configuration that may be fitted inside a compact case or other narrow space. The eyeglasses may include a frame configured to hold one or more lenses and defining an imaginary plane, at least one temple piece, and at least one hinge connecting the at least one temple piece to the frame, wherein the hinge is configured to rotate the at least one temple piece between a first position extending substantially perpendicular to the imaginary plane defined by the frame, and second position extending substantially parallel to the imaginary plane.

Abstract: An apparatus can include an electrochromic device. When using the apparatus, the electrochromic device can be switched from a first transmission state to a continuously graded state and maintained at continuously graded transmission state. An apparatus can include an active stack with a first transparent conductive layer, a second transparent conductive layer, an anodic electrochemical layer between the first and the second transparent conductive layers, and a cathodic electrochemical layer between the first and the second transparent conductive layers. The apparatus can further include a first bus bar electrically coupled to the first transparent conductive layer, a second bus bar electrically coupled to the second transparent conductive layer, where the second bus bar is generally non-parallel to the first bus bar, and a third bus bar electrically coupled to the first transparent conductive layer, where the third bus bar is generally parallel to the first bus bar.

Abstract: A system for making a holographic medium for use in generating light patterns for eye tracking includes a light source configured to provide light and a beam splitter configured to separate the light into a first portion of the light and a second portion of the light that is spatially separated from the first portion of the light. The system also includes a first set of optical elements configured to transmit the first portion of the light for providing a first wide-field beam onto an optically recordable medium and one or more diffractive optical elements configured to receive the second portion of the light and project a plurality of separate light patterns onto the optically recordable medium for forming the holographic medium.

Abstract: An optical lens includes a first lens group, an aperture, and a second lens group which are sequentially arranged along an optical axis from a magnified side to a minified side. The first lens group has a negative refractive power and includes three lenses with refractive powers. The first lens group includes a lens with positive refractive power. The first lens group includes an aspheric lens. The second lens group has a positive refractive power and includes three lenses with refractive power. The second lens group includes a lens with a negative refractive power. The second lens group includes a lens closest to the minified side which is a cemented lens. The second lens group includes an aspheric lens. In the optical lens, a number of the lenses having the refractive powers is within a range from 6 to 8.

Abstract: There is provided an imaging lens with high resolution which effectively achieves low-profileness while maintaining the wide field of view, and favorably corrects aberrations. The imaging lens comprising a first lens having negative refractive power, a second lens having positive refractive power, a third lens, a fourth lens having positive refractive power, a fifth lens having negative refractive power as a double-sided aspheric lens, and a sixth lens as a double-sided aspheric lens, wherein the first lens has a concave surface facing the image side, and the aspheric surface on the image side of the sixth lens is formed as a concave surface near the optical axis and has at least one pole point at an off-axial point, and a below conditional expression (1) is satisfied: ??45°??(1) where ?: a half field of view.

Abstract: Techniques for adjusting an optical element using an actuator assembly. The optical element is adjusted by translating the optical element along a linear axis of motion or by applying force upon a surface of the optical element. The optical element can be a liquid lens that is shaped by the application of force upon a surface of the lens. The actuator assembly includes a plurality of lead screws and a mechanical linkage that intercouples the lead screws and that is configured to simultaneously rotate the plurality of lead screws. The actuator assembly further includes a displacement element configured to act upon the optical element, through translational motion of the displacement element in response to rotation of the lead screws. Multiple optical elements can be adjusted simultaneously using respective displacement elements coupled to the lead screws.

Abstract: A spatial light modulator system includes a concentration layer including an array of optical concentrators, such that each concentrator concentrates a portion of an input light beam. A modulation layer includes an array of light modulators each in optical communication with one of the optical concentrators for modulating the portion of the input light beam. The light modulators are spaced apart from one another in the modulation layer to form gaps between adjacent ones of the light modulators. A coil of each light modulator can surround a Faraday element or core containing a Faraday material to control a magnetic state of a Faraday material responsive to control signals.

Abstract: To provide binocular loupes capable of ensuring an optimal focal distance for a user using a simple operation, focus adjustment units disposed in eyepiece units of a pair of left and right loupe bodies of binocular loupes are provided with focus adjustment lenses, and holding rings having magnetic bodies into which the focus adjustment lenses are fitted. The holding rings are mounted in contact with correction lenses constituting optical systems inside the loupe bodies, are drawn and held by magnet rings. By this means, it is possible to readily replace the focus adjustment lenses by mounting the lenses detachably from the loupe bodies, and it is possible to ensure an optimal focal distance.

Abstract: Provided is a zoom lens, which includes lens units, in which an interval between each pair of adjacent lens units is changed during zooming, the zoom lens including, in order from an object side to an image side: a first lens unit having a negative refractive power; a first lens subunit having a positive refractive power; and a second lens subunit having a negative refractive power. During focusing from infinity to minimum object distance, the first lens subunit is moved toward the object side, and the second lens subunit is moved toward the image side. Further, a movement amount of the first lens subunit during focusing from infinity to minimum object distance at a telephoto end, a movement amount of the second lens subunit during focusing from infinity to minimum object distance at the telephoto end, and a focal length at the telephoto end are appropriately set.

Abstract: A lens system is provided. The lens system includes a positive first lens group, an aperture diaphragm, a positive second lens group, and a third lens group, disposed sequentially from a subject side. The first lens group includes at least three positive lenses and at least one negative lens. The second lens group includes four or more lenses including at least one cemented lens. A negative lens with a concave surface toward the subject side is disposed at the subject side. The third lens group includes three or more lenses including at least one positive lens and at least one negative lens. When focusing is moving from an infinity-distance subject to a short-distance subject, the first lens group, the aperture diaphragm, and the second lens group move integrally toward the subject side, while the third lens group is fixed with respect to an image surface.

Abstract: The disclosed retroreflective element includes a highly durable core with an ionic copolymer and a plurality of beads. These disclosed retroreflective properties remain intact even after continued application of external forces and stresses. Further, the ionic copolymer allows for beads to be loaded into the ionic copolymer of the core, securely disposed around the perimeter of the core, or both.

Abstract: A lens sheet and lens sheet unit include an imaging module and an imaging device which can be made thinner. A first lens sheet has light transmission parts having a unit lens shape, and light absorption parts disposed alternatively with the light transmission parts. A lens sheet unit, on the image sensor side of the first lens sheet, includes a second lens sheet. The second lens sheet has light transmission parts having a unit lens shape, and light absorption parts disposed alternatively with the light transmission parts. When viewed from the optical axis direction, the direction in which the light transmission parts are arranged and the direction in which the light transmission parts are arranged intersect at an angle. An imaging module and a camera are included with the above lens sheet and lens sheet unit.

Abstract: The present disclosure provides a display apparatus, including: a control circuit; a display unit, configured to generate images; and a first spatial light modulator, set at a front end of the display unit and connected to the control circuit through signals, where the first spatial light modulator is configured to change a modulation pattern or content based on electronic signals generated by the control circuit, to dynamically adjust spatial imaging distances. In addition, the present disclosure further provides a method for controlling a display apparatus.

Abstract: A virtual image display device includes an image element configured to display an image, a first lens disposed in an extraction position of image light and including at the image element side thereof a convex surface, a second lens disposed further toward the image element side than the first lens and including a concave surface bonded to the convex surface of the first lens, a half mirror provided in a bonding portion for bonding together the convex surface and the concave surface, a transmission/reflection selection member provided at a light emitting side of the first lens and configured to selectively perform transmission or reflection of the light depending on a polarization state of the light, and a light-guiding portion keeping close contact between the image element and the second lens and configured to guide the image light.

Abstract: Embodiments of a display device are described. The display device includes a backlight unit having a light source, a quantum dot film, and a radiation absorbing element. The quantum dot film is optically coupled to the light source and is configured to process light received from the light source. The radiation absorbing element is optically coupled to the quantum dot film and is configured to tune a spectral emission width of the processed light received from the quantum dot film to achieve over 90% color gamut coverage of a standard RGB color space.

Abstract: Provided is a diffusion sheet having a function for preventing warping, and having excellent optical and diffusion characteristics. A diffusion sheet 1 has a minute roughness pattern formed on the surface thereof, the pattern configured such that first protrusions 3a having a first height and second protrusions 3b having a second height lower than the first height are disposed in parallel. A portion of the first protrusions 3a is bonded to a bonding layer on the rear surface of an upper-layer sheet laminated on the surface of a diffusion sheet 2, and the second protrusions 3b are not bonded to said bonding layer. The following relationships are satisfied: h1:h2=1:0.5-0.1, and w1:w2=1:1.0-0.1, where h1 is the height of the first protrusions 3a, w1 is the width of the first protrusions 3a, h2 is the height of the second protrusions 3b, and w2 is the width of the second protrusions 3b.

Abstract: An embodiment of a head up display device may comprise: a light source unit; a first light transmitting member which is disposed opposite to the light source unit in the optical axis direction; a second light transmitting member which is disposed opposite to the first light transmitting member in the optical axis direction; a display unit which is disposed opposite to the second light transmitting member in the optical axis direction and to which light having passed through the second light transmitting member is incident; and a light diffusing member which is disposed between the second light transmitting member and the display unit, wherein the display unit is inclined with respect to the optical axis direction, and the light diffusing member is inclined with respect to the optical axis direction so as to be parallel to the display unit.