Abstract: The present disclosure is of a piezoelectric speaker. The piezoelectric speaker includes a plurality of piezoelectric elements and a vibration transmission plate. Each piezoelectric element is configured to generate vibration based on an audio signal. The vibration transmission plate includes a plurality of elastic rods and a mass block, and each elastic rod connects the mass block and one of the plurality of piezoelectric elements. The mass block simultaneously receives the vibration of the plurality of piezoelectric elements and generates at least two resonance peaks in a frequency range of 20 Hz-40000 Hz.

Abstract: A film structure comprises a substrate and a buffer film formed on the substrate. The substrate is a 36° to 48° rotated Y-cut Si substrate, or the substrate is a SOI substrate comprising a base substance made of the 36° to 48° rotated Y-cut Si substrate, an insulating layer on the base substance, and a SOI layer made of a Si film on the insulating layer, and a Miller index of a crystal plane of an upper surface of the SOI layer is equal to the Miller index of a crystal plane of an upper surface of the base substance. The buffer film comprises ZrO2 epitaxially grown on the substrate.

Abstract: Provided is a display panel. The display panel includes: a substrate, and a plurality of first light-emitting devices, a plurality of first pixel drive circuits, a plurality of connecting lines, a plurality of second light-emitting devices and a plurality of second pixel drive circuits disposed on the substrate. The plurality of first light-emitting devices disposed in a light-transmitting display region are coupled to the first pixel drive circuits disposed in a conventional display region through the plurality of connecting lines. An acute angle is provided between an extending direction of at least part of segments of at least one connecting line in the plurality of connecting lines and the first direction, wherein the at least part of segments are disposed in the light-transmitting display region.

Abstract: A mandrel 1 for holding an ophthalmic lens member blank 16 during machining is disclosed. The mandrel 1 has a front surface 6 for receiving an ophthalmic lens member blank 16 to be machined. The front surface 6 comprises a planar surface region 10; a curved surface region 8; and a drainage channel 12 located between the curved surface region 8 and the planar surface region 10 such that wax applied to the curved surface region 8 flows into the drainage channel 12. A kit of parts comprising such a mandrel 1, a method of mounting an ophthalmic lens member blank 16 for machining, a method of machining an ophthalmic lens member blank 16, an ophthalmic lens produced using the apparatus and a batch of such lenses are also disclosed.

Abstract: An imaging lens system includes seven lens elements which are, in order from an object side to an image side along an optical path, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element and a seventh lens element. Each of the seven lens elements has an object-side surface facing toward the object side and an image-side surface facing toward the image side. The first lens element has negative refractive power. The image-side surface of the fifth lens element is convex in a paraxial region thereof. The sixth lens element has negative refractive power. The object-side surface of the sixth lens element is concave in a paraxial region thereof. At least one of the object-side surface and the image-side surface of at least one of the seven lens elements has at least one inflection point.

Abstract: A lens assembly includes a first lens, a second lens, a third lens, a first reflective element, and a second reflective element. The first lens is with positive refractive power. The first reflective element includes a first surface, a second surface, and a third surface, wherein the first surface and the third lens are opposite to each other. The second reflective element includes a fourth surface, a fifth surface, and a sixth surface, wherein the fourth surface and the third surface are opposite to each other. The first lens, the second lens, the third lens, and the first reflective element are arranged in order from an object side along a first axis. The first reflective element and the second reflective element are arranged in order along a second axis. The second reflective element and an image plane are arranged in order along a third axis.

Abstract: An apparatus, and corresponding method, for determining a property of an eye includes a housing with a proximal port that receives an eye and also light from the eye. The housing further includes a distal port, and the two ports together form a visual channel providing an open view to enable the eye to see target indicia external to and spaced away from the housing. A wavefront sensor within the housing is configured to receive the light from the eye via the optical path and to measure a wavefront of the light. A determination module determines an objective refractive correction based on the wavefront and predicts a subjective refractive preference of a person having the eye based on the objective refractive correction. Embodiments can be handheld, and binocular, and predict subjective refraction based on demographic and other information.

Abstract: A light-emitting diode includes an epitaxial structure, at least one via hole, a first insulation layer, a first connecting electrode, a second connecting electrode, a second insulation layer, a first pad, and a second pad. The first insulation layer includes a first insulation portion and a second insulation portion such that an upper surface of the first connecting electrode and an upper surface of the second connecting electrode are disposed on the same level so as to ensure that an upper surface of the first pad and an upper surface of the second pad are also on the same level.

Abstract: The invention relates to an ophthalmic article (1), in particular for sunglasses, comprising at least one substrate (9) and a photochromic filter compound (15), the ophthalmic article (1) having a first transmission spectrum in an activated state of the photochromic filter compound (15) and a second transmission spectrum in a deactivated state of the photochromic filter compound, such that: ?—the first and the second transmission spectra at wavelengths lower than 380 nm is lower than 1%, ?—the first and the second transmission spectra have a relative first maximum between 460 nm and 510 nm, ?—the first and the second transmission spectrum have a relative first minimum between 560 nm and 610 nm, and where ?—Tvactivated is the luminous transmittance according to ISO_13666 in the activated state of the photochromic filter compound. ?—Tvdeactivated is the luminous transmittance according to ISO_13666 in the deactivated state of the photochromic filter compound.

Abstract: The paramagnetic garnet-type transparent ceramic a sintered object of a composite oxide represented by formula (1), (Tb1-x-yYxScy)3(Al1-zScz)5O12 (0.05?x<0.4, 0?y<0.004, 0.6?1?x?y<0.95, 0?z<0.004, and 0.001<y+z<0.005), which contains SiO2 as a sintering aid in an amount larger than 0 mass % but not larger than 0.1 mass %, and having an average sinter-grain diameter of 5 ?m or larger. The transparent ceramic has a total light transmittance of 84.0% or greater and a forward scatter of 0.5% or less at an optical path length of 25 mm and a wavelength of 1,064 nm and has a total light transmittance of 84.0% or greater and a forward scatter of 0.5% or less at an optical path length of 25 mm and a wavelength of 1,300 nm. In the formula (1).

Abstract: An optical system includes, in order from an object side to an image side, a first lens unit having positive refractive power, a second lens unit having positive refractive power, a third lens unit, a fourth lens unit having positive refractive power, and a fifth lens unit having negative refractive power. During focusing from infinity to a close distance, a distance between adjacent lens units changes and the second lens unit and the fourth lens unit move toward the object side. At least one of the second lens unit and the fourth lens unit includes two or more lenses. The first lens unit includes two or more negative lenses. A predetermined inequality is satisfied.

Abstract: A spectrally-shaped source includes a source that generates a round beam. An optical element transforms the round beam to a rectangular beam. An image forming dispersive device angularly disperses wavelengths and images the rectangular beam at a modulation plane. A pixelated SLM is illuminated by the dispersed wavelengths of the rectangular beam such that each column of illuminated pixels is illuminated by a different wavelength. Toroidal optics projects light directed from the SLM to an output plane and focuses the angularly dispersed wavelengths of the beam so that a selected portion of the optical beam is reflected toward the toroidal optic by the SLM. A controller instructs the pixelated SLM to selectively reflect the portion of the optical beam toward the toroidal optic and to selectively reflect another portion of the beam away from the toroidal optic so as to provide a desired spectral shape.

Abstract: The present disclosure relates to contact lenses for use with eyes experiencing eye-length related disorders, like myopia with or without astigmatism. This invention relates to a contact lens for managing myopia with or without astigmatism: wherein the contact lens is configured with an optical zone defined substantially centred about its optical axis to provide a meridionally and azimuthally variant power distribution resulting, at least in part, in a foveal correction of the myopic eye and, at least in part, resulting in a conoid of partial blur at the retina of the myopic eye, serving as a directional cue or an optical stop signal; and a non-optical peripheral carrier zone about the optical zone configured with a invariant azimuthal thickness distribution, with or without rotation assisting features, to further provide temporally and spatially varying stop signals to decelerate, control, inhibit, or reduce the rate of myopia progression substantially consistent over time.

Abstract: Systems and methods for multi-color imaging using a microscope system. The microscope system can have a relatively small size as compared to an average microscope system. The microscope system can include various components configured to reduce or eliminate image artifacts such as chromatic aberrations and/or noise from stray light that can occur during multi-color imaging. The components can be configured to reduce or eliminate the image artifacts, and/or noise without substantially changing the size of the microscope system.

Abstract: An optical computing device includes: a light-diffraction element group including planar light-diffraction elements made of a photo-curable resin; and a tubular body that houses the light-diffraction element group and that has an inner surface to which at least a part of a perimeter of each of the planar light-diffraction elements is fixed.

Abstract: An optical film includes a transparent substrate having opposite first and second surfaces, a colored layer formed to face the first surface of the substrate, and an optical function layer. A colorant in the colored layer contains at least one of a first coloring material having a maximum absorption wavelength in a range of 470 to 530 nm and an absorption spectral half width of 15 to 45 nm, a second coloring material having a maximum absorption wavelength in a range of 560 to 620 nm and an absorption spectral half width of 15 to 55 nm, and a third coloring material having the lowest transmittance in a wavelength range of 400 to 800 nm is in a range of 650 to 800 nm. A transmittance in one of the absorption wavelength bands of the colorant is 1% or more and less than 50%, and ?E*ab.

Abstract: A subjective refractor apparatus for astigmatism testing allowing observation along an optical observation axis with an optical vision correction of variable power. The apparatus allows a patient's use of a tactile input device to control the rotary movement of rotatable optical elements with cylindrical power, varying the angular position of the optical elements to adjust the total cylindrical power and orientation of the cylinder axis of the resulting optical system. The tactile input device is capable of receiving input in two or more dimensions, with each dimension of input controlling the rotary movement of a single cylindrical optical element to adjust the combined cylindrical optical power of the two optical elements. The optical elements position readings may be sensed by rotational position sensors and sent to an operationally connected microprocessor for interpretation and display.

Abstract: A system includes a housing and a light emission source positioned within the housing and including a first light emitter array characterized by a first polarization state and a second light emitter array characterized by a second polarization state. The light emitted by the light emission source is configured to propagate along an optical axis. The system also includes a lens positioned within the housing along the optical axis and a wavefront modification element positioned within the housing along the optical axis. The wavefront modification element comprises a polarization-sensitive diffractive structure.

Abstract: A lens assembly may include an image sensor, a first lens group disposed closest to an object side, the first lens group including multiple lenses and having negative power, a second lens group disposed to be moveable forward/backward along an optical axis direction, the second lens group having positive power, and a third lens group disposed to be moveable forward/backward along the optical axis direction, the third lens group including multiple lenses and having negative power, where the second or third lens group may move toward the object side so as to increase the focal length of the lens assembly, and the second lens group includes a lens having negative power and a lens having positive power and is disposed adjacent to the lens having negative power on the object side. In addition, various other embodiments may be possible.

Abstract: A stator for an electrical machine defines a central axis and has a first stator face facing parallel to the central axis and a second stator face facing parallel to the central axis, with the first stator face and the second stator face facing in opposite directions. The stator includes a plurality of ferromagnetic segments disposed about the central axis, each segment having a pair of parallel faces that face parallel to the central axis of the stator. On each stator face, faces of adjacent segments of the plurality of segments form gaps therebetween, the gaps extending radially relative to the central axis, the gaps on the first stator face being angularly offset relative to the central axis from the gaps on the second stator face.