Abstract: A single-focal lens system includes a first lens group having positive power, an aperture diaphragm, and a second lens group having positive power, in this order from an object side to an image side. The first lens group includes a first lens element having negative power, a second lens element having negative power, and a third lens element having positive power in this order from the object side to the image side. The second lens group includes a fourth lens element having power and a fifth lens element having positive power. When fG1 is a focal length of the first lens group at a d-line, fG2 is a focal length of the second lens group at the d-line, f4 is a focal length of the fourth lens element at the d-line, f is a focal length of an entire system at the d-line, and w is a half angle of view, a condition (1), a condition (3c) and a condition (6) shown below are satisfied. 0.5<fG1/fG2<3.0??(1) 11.

Abstract: A method and system for an electrically switchable window system for an aerospace vehicle. The electrically switchable window system comprises electrically switchable windows and a window controller system connected to the electrically switchable windows. The window controller system receives a group of wireless signals from an onboard network system that controls systems in the aerospace vehicle and changes voltages applied to the electrically switchable windows when the group of wireless signals are received. The changes in the voltages change an amount of light passing through the electrically switchable windows.

Abstract: Broadband visible reflectors are disclosed. In particular, broadband visible reflectors with reduced on-axis blue reflectivity are described. Broadband visible reflectors that appear yellow in reflection are described. Such broadband visible reflectors may be used in backlights and displays.

Abstract: A backplane for an electro-optic display including an electrode and a substrate. The substrate may be porous to liquids, e.g., water, and may formed, from cellulose or a similar hydrophilic polymer. The electrode is desirably also porous to the same liquid as the substrate, so that the electrodes do not form liquid-impervious areas on the substrate. For example, when the liquid is water (or an aqueous solution) the electrodes may be formed of a hydrophilic carbon black, which may be coated or screen-printed on to the substrate.

Abstract: The present disclosure discloses an iris lens assembly including, sequentially from an object side to an image side along an optical axis, a first lens and at least one subsequent lens. Wherein an object-side surface of an lens closest to the image side and having optical power among the at least one subsequent lens is a concave surface. The iris lens further includes an optical filter disposed between the object side and the lens closest to the image side and having optical power, and a band-pass wavelength of the optical filter is from 700 nm to 900 nm.

Abstract: An optical lens system is disclosed. The optical lens system includes a first lens that has negative refractive power, a second lens that has positive refractive power, a third lens that has positive refractive power, a fourth lens that has refractive power, a fifth lens that has positive refractive power, a sixth lens that has negative refractive power, an aperture located between the second lens and the third lens, and conditional expressions of “?1.4<tan ?/f<?1.1” and “4.0<TTL/BFL<6.0” are satisfied when ? is an angle of view of the optical lens system in a diagonal direction, f is a focal length of the optical lens system, TTL is a distance on an optical axis from the object-side surface of the first lens to the sensor, and BFL is a distance on the optical axis from the sensor-side surface of the sixth lens to the sensor.

Abstract: A zoom lens comprises, in order from an object, a first lens group (G1) having negative refractive power, a second lens group (G2) having positive refractive power, a third lens group (G3) having negative refractive power, and a fourth lens group (G4) having positive refractive power to satisfy the following conditional expression: 1.60<(?f1)/fw<2.50 where, f1 denotes a focal length of the first lens group; and fw denotes a focal length of the zoom lens as a whole in a wide-angle end state.

Abstract: The present disclosure discloses an imaging lens assembly. The imaging lens assembly includes sequentially, from an object side to an image side along an optical axis, a first lens, a second lens, a third lens, a fourth lens and a fifth lens. The first lens has a positive refractive power, an object-side surface of the first lens is a convex surface, and an image-side surface of the first lens is a convex surface; the second lens has a negative refractive power; the third lens has a positive refractive power, an object-side surface of the third lens is a convex surface, and an image-side surface of the third lens is a convex surface; the fourth lens has a positive refractive power; and the fifth lens has a negative refractive power, and a surface tilt angle ?5 of an object-side surface of the fifth lens at a maximum effective radius satisfies: ?20°<?5<5°.

Abstract: The present disclosure discloses an imaging lens assembly which includes, sequentially from an object side to an image side along an optical axis, a first lens to a fifth lens. The first lens has a positive refractive power and a convex object-side surface. The second lens has a negative refractive power, a concave object-side surface and a concave image-side surface. The third lens has a negative refractive power. The fourth lens has a positive or a negative refractive power. The fifth lens has a positive or a negative refractive power, a concave object-side surface, and an image-side surface of the fifth lens is a convex surface or a plane. An air spacing T23 between the second lens and the third lens on the optical axis and an air spacing T34 between the third lens and the fourth lens on the optical axis satisfy: 1.0?T23/T34<2.0.

Abstract: The imaging lens consists of, in order from the object side, a positive first lens group, a stop, a positive second lens group, and a negative third lens group. Lenses arranged first and second from the object side are both negative single lenses having convex surfaces toward the object side. The second lens group includes a cemented lens in which a negative lens and a positive lens are cemented. During focusing, only the second lens group moves. Assuming that focal lengths of the first lens group and the second lens group are f1 and f2, respectively, the imaging lens satisfies 0.7<f1/f2<2.

Abstract: The present disclosure discloses a camera optical lens. The camera optical lens includes, in an order from an object side to an image side, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. The camera optical lens further satisfies specific conditions.

Abstract: The present disclosure discloses an optical imaging system including sequentially, from an object side to an image side along an optical axis, a first lens, a second lens, and at least one subsequent lens. The first lens may have: a first transmission surface disposed on an outer circumference of an object-side surface of the first lens; a first reflection surface disposed on an outer circumference of an image-side surface of the first lens; a second reflection surface disposed at a paraxial region of the object-side surface of the first lens; and a second transmission surface disposed at a paraxial region of the image-side surface of the first lens. A distance TTL from a center of the object-side surface of the first lens to an image plane of the optical imaging system on the optical axis and an effective focal length f of the optical imaging system may satisfy: TTL/f?0.6.

Abstract: The multiuse eyeglasses include a frame that holds two lenses and arms that extend from the frame. The arms include a first axis of rotation that is generally perpendicular to the arms and a second axis of rotation that is orthogonal to the first axis of rotation and allows the arms to be rotated downwards relative to the frame.

Abstract: A projection lens is disclosed. The projection lens includes, in sequence from an object side to an image side: an object surface, a first lens having positive refractive power, a second lens having negative refractive power, and a third lens having positive refractive power, where a focal length of the entire projection lens is f, a total optical length of the projection lens is TTL, a refractive index of the second lens is n2, a refractive index of the third lens is n3, and the following conditions are satisfied: 1.7?n2?2.2; 1.7?n3?2.2; and 1.25?f/TTL?2.20. The projection lens can effectively reduce the system length, and has good performance stability at different temperatures.

Abstract: A method for spectral filtering an input optical signal is described. The filtering system uses Brillouin gain inside an interferometer. The interferometer is biased to null signals that propagate without Brillouin gain, but due to asymmetric levels of gain in the interferometer arms the interference null is disturbed for signals of an optical frequency that experience Brillouin gain. The filter thereby preferentially passes signal frequencies that are inside the Brillouin gain bandwidth creating a high extinction ratio filter. The narrow bandwidth of the Brillouin gain effect can allow for spectrally narrow filters such as 30 MHz. The filter can be realized in a stable Sagnac loop configuration even if the pump and signal are combined prior to the Sagnac loop by using a power control device such as an attenuator placed asymmetrically inside the loop. The filter can achieve net gain and can be designed to have a tunable bandwidth.

Abstract: An optical laminate includes a wavelength selective reflective element, and an absolute phase adjustment layer which is provided on at least one surface side of the wavelength selective reflective element and has optical isotropy, and in which a first region having a first optical path length and a second region having a second optical path length different from the first optical path length are arranged in a pattern with a diffraction grating-like period. The optical laminate reflects light in the specific reflection wavelength region by the wavelength selective reflective element, of light incident from the absolute phase adjustment layer side. In the optical laminate, light which enters the first region of the absolute phase adjustment layer and is reflected by the wavelength selective reflective element and light which enters the second region and is reflected by the wavelength selective reflective element interfere with each other.

Abstract: A vehicle door mirror includes a mirror housing accommodating an electrical component therein, a base member made from a resin, and a shaft having a cord through hole through which a cord that is to be connected to the electrical component is inserted, the shaft being standingly provided on the base member so as to pivotably support a base end portion of the mirror housing. The base member has a slit formed therein. The slit has an outer end opening on a side edge of the base member so that the cord guided out from the cord through hole toward the base member side can be inserted through the slit. A linking part that links paired mutually opposing side faces of the slit together via an inner end part of the slit is formed on the base member so as to have a shape protruding downward.

Abstract: Tiling light sheet selective plane illumination microscopy (TLS-SPIM) improves the 3D imaging ability of SPIM by using a real-time optimized tiling light sheet. However, the imaging speed decreases, and size of the raw image data increases proportionally to the number of tiling positions in TLS-SPIM. The decreased imaging speed and the increased raw data size could cause significant problems when TLS-SPIM is used to image large specimens at high spatial resolution. An exemplary aspect solves this problem. Discontinuous light sheets created by scanning coaxial beam arrays synchronized with camera exposures are used for 3D imaging to decrease the number of tiling positions required at each image plane without sacrificing the spatial resolution. One exemplary aspect investigates the performance of the method via numerical simulation and discuss the details thereof.

Abstract: Aspects of the present disclosure describe systems, methods, and structures for aberration correction of optical phased arrays that employ a corrective optical path difference (OPD) in the near-field of an OPA to correct or cancel out aberrations in emitted beams of the OPA including those reaching far-field distances by generating a spatially-varying OPD across the aperture of the OPA that is substantially equal and opposite to an equivalent OPD of the aberration(s).

Abstract: A display device and an apparatus. The display device includes light emitter to emit light, an image generator to generate image light using the light emitted from the light emitter, a diffusion plate configured to diffuse the image light, and a light condensing element to receive and condense the image light diffused by the diffusion plate. A component in an optical path between the light emitter and the diffusion plate is disposed at a position different from a position of a light condensing portion of external light having transmitted through the diffusion plate via the light condensing element. The apparatus includes a light emitter to emit light, an image generator to generate image light using the light emitted from the light emitter, a diffusion plate to diffuse the image light, and a concave mirror to reflect the image light diffused by the diffusion plate to a transmission reflection member.