Abstract: There is provided an imaging lens with excellent optical characteristics which satisfies demand of low profile and low F-number. An imaging lens comprising in order from an object side to an image side, a first lens with positive refractive power having an object-side surface being convex in a paraxial region, a second lens with negative refractive power in a paraxial region, a third lens with negative refractive power having an object-side surface being convex in a paraxial region, a fourth lens having an object-side surface being convex in a paraxial region, a fifth lens with negative refractive power in a paraxial region, and a sixth lens with positive refractive power having an image-side surface being convex in a paraxial region, and predetermined conditional expressions are satisfied.

Abstract: A camera optical lens is provided and includes, from an object side to an image side, a first lens and a second lens that have positive refractive power, a third lens, a fourth lens, a fifth lens, a sixth lens having a positive refractive power, a seventh lens having a negative refractive power, an eighth lens having a positive refractive power, and a ninth lens having a negative refractive power. The camera optical lens satisfies: 3.80?f1/f?7.50; and 3.00?d9/d10?12.00, where f denotes a focal length of the camera optical lens, f1 denotes a focal length of the first lens, d9 denotes an on-axis thickness of the fifth lens, and d10 denotes an on-axis distance from an image side surface of the fifth lens to an object side surface of the sixth lens. The camera optical lens meets design requirements for large aperture, wide angle and ultra-thinness while having good optical performance.

Abstract: A retina viewing system and method of using the same includes an ophthalmic microscope, a disposable lens attachment, and an electronic control unit (ECU). The microscope has an optical head and a set of internal focusing lenses, the latter providing the microscope with a variable working distance or focal length. The disposable lens attachment includes a resilient body with a proximal end connected to the optical head and a distal end connected to a high-power/high-diopter distal lens. The ECU executes instructions for viewing a retina or other intraocular anatomy of a patient eye. Execution of the instructions causes the ECU to automatically adjust the variable working distance or focal length of the microscope when viewing an image of the retina through the distal lens.

Abstract: Spectacle frame (1) comprising: a front piece (10); a pair of temples (20), each temple (20) extending between a first end portion (21) associated with the front piece (10) and a second end portion (22) that can be positioned on the ear of a user; a pair of hinges (30) configured to rotationally bind each temple (20) to the front piece (10), each hinge (30) comprising: a pin (40) extended along a development direction (A-A) between a first end (40a) and a second end (40b), coupling devices (50) associated with the first end portion (21) of each temple (20) and configured to engage the corresponding pin (40); a cavity (60) located in the front piece (10), the cavity (60) comprising: a first wall (70) and an opposite second wall (80) spaced along a spacing direction (B-B); and blocking devices (90) configured to engage the ends (40a, 40b) of the pins (40), the blocking devices (90) being shaped to match the first end (40a) and the second end (40b) of the pin (40) to prevent the pin (40) from making rotational m

Abstract: An imaging optical lens assembly includes nine 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, a seventh lens element, an eighth lens element and a ninth lens element. Each of the nine 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 positive refractive power. The second lens element has negative refractive power. The image-side surface of the ninth lens element is concave in a paraxial region thereof and has at least one inflection point.

Abstract: A camera optical lens includes first to sixth lenses from object side to image side, with first, third and sixth lenses having negative refractive power and second and fourth lenses having positive refractive power, and satisfies: ?3.00?f1/f??1.50; 1.50?d4/d6?4.00; and R7/R8??8.00, where f and f1 denotes respectively focal lengths of the camera optical lens and the first lens, R7 denotes a curvature radius of an object side surface of the fourth lens, R8 denotes a curvature radius of an image side surface of the fourth lens, d4 denotes an on-axis distance from an image side surface of the second lens to an object side surface of the third lens, and d6 denotes an on-axis distance from an image side surface of the third lens to the object side surface of the fourth lens, thereby meeting requirements of a large aperture, a wide angle, and ultra-thinness while having good optical performance.

Abstract: An electronic device may have a display that emits image light, a waveguide, and an input coupler that couples the image light into the waveguide. Beam splitter structures may be embedded within the waveguide. The beam splitter structures may partially reflect the image light multiple times and may serve to generate replicated beams of light that are coupled out of the waveguide by an output coupler. The beam splitter structures may replicate the beams across two dimensions to provide an eye box with uniform-intensity light from the display across its area. The beam splitter structures may include stacked partially reflective beam splitter layers, sandwiched transparent substrate layers having different indices of refraction, a thick volume hologram interposed between substrate layers, or combinations of these or other structures. The reflectivity of the beam splitter structures may vary discretely or continuously across the lateral area of the waveguide.

Abstract: The imaging lens consists of, in order from the object side, a front group that includes a stop and has a positive refractive power, and a rear group. During focusing, the entire front group integrally moves, and the rear group remains stationary with respect to an image plane. The rear group includes one or more air lenses formed by two concave lens surfaces facing toward each other. The imaging lens satisfies Conditional Expressions: 0.1<Bf/f<0.9 and ?0.7<(Rrf+Rrr)/(Rrf?Rrr)<?0.025, where a back focal length of a whole system is Bf, a focal length of the whole system is f, and a curvature radius of an object side surface of the air lens in the rear group is Rrf and a curvature radius of an image side surface of the air lens in the rear group is Rrr.

Abstract: The present disclosure relates to an optical lens and discloses a camera optical lens. The camera optical lens includes, from an object side to an image side: a first lens with a negative refractive power, a second lens with a positive refractive power, a third lens with a positive refractive power, a fourth lens with a negative refractive power, a fifth lens with a positive refractive power, and a sixth lens with a negative refractive power. The camera optical lens satisfies: 65.00?v3?95.00; R2/R1??2.00; ?10.00?f4/f5??2.00; wherein, v3 denotes an abbe number of the third lens; f4 denotes a focal length of the fourth lens; f5 denotes a focal length of the fifth lens; R1 denotes a central curvature radius of an object-side surface of the first lens; and R2 denotes a central curvature radius of an image-side surface of the first lens.

Abstract: An image forming optical system consists of a first optical system and a second optical system in order from a magnification side. An intermediate image is formed between the first optical system and the second optical system. Among the aspherical lenses included in the first optical system, a specific lens, which is the aspherical lens closest to the intermediate image on the optical path, has a meniscus shape of which a surface is convex toward the reduction side in a paraxial region. The image forming optical system satisfies a maximum image height, a focal length, and predetermined conditional expressions for the specific lens.

Abstract: An electrochromic device composed of a pattern forming layer, an optical coating layer, an electrochromic component, and an opaque white layer arranged is revealed. The pattern forming layer has at least one pattern-shaded hollow hole for exposure of the optical coating layer. The optical coating layer which includes at least two layers of high and low refractive index material stacked alternately is the main layer to render colors. When transmittance of the electrochromic component which generates color changes is lower than 50%, a difference in the transmittance at 500 nm, 600 nm, and 700 nm is no more than 10%. Under such colored state, the color of light reflected by the optical coating layer is enhanced. The opaque white layer is for a sharper color contrast of the reflected light. Thereby light reflected by the optical coating layer show colors different from those of the electrochromic component in bleached and colored states.

Abstract: A zoom lens (ZL) comprises, in order from an object: a first lens group (G1) having negative refractive power; an aperture stop (S); 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. In this zoom lens (ZL), upon zooming from a wide angle end state to a telephoto end state, a distance between the aperture stop (S) and the first lens group (G1), a distance between the aperture stop (S) and the second lens group (G2), and a distance between the aperture stop (S) and the third lens group (G3) are changed and the aperture stop (S) is moved in an optical axis direction.

Abstract: Provided are a zoom lens comprising, in order from an object side, a first lens group having positive refractive power, a second lens group having negative refractive power, a third lens group having positive refractive power, a fourth lens group having negative refractive power, and a fifth lens group having positive refractive power, in which distances between the respective lens groups are changed to change magnification, the first lens group consists of one single lens having spherical surfaces on both sides, the single lens is a positive meniscus lens having a convex shape toward the object side, at a time of magnification change from a wide-angle end to a telephoto end, the second lens group moves along a path convex toward the image side, and a predetermined conditional expression is satisfied, and an imaging apparatus including the zoom lens.

Abstract: A zoom lens includes, in order from an object side to an image side, a first lens unit having a negative refractive power, a second lens unit having a positive refractive power, a third lens unit having a negative refractive power, and a fourth lens unit having a positive refractive power. The first lens unit includes a negative lens B1Ln with a concave surface facing the object side. The second lens unit includes at least one negative lens. During zooming from a wide-angle end to a telephoto end, the first lens unit moves, and the fourth lens unit is fixed or moves from the object side to the image side. A predetermined condition is satisfied.

Abstract: A camera optical lens includes, from an object side to an image side: a first lens having a positive refractive power, a second lens having a negative refractive power, a third lens having a negative refractive power, a fourth lens, a fifth lens having a positive refractive power and a sixth lens having a negative refractive power. The camera optical lens satisfies conditions of 1.00?(d1+d3+d5+d7+d9)/d11?2.20 and (R5+R6)/(R5?R6)??1.00, here d1, d3, d5, d7 and d9 denote an on-axis thickness of the first, the second, the third, the fourth, the fifth, and the sixth lenses, respectively, R5 denotes a curvature radius of an object-side surface of the third lens, and R6 denotes a curvature radius of an image-side surface of the third lens. The camera optical lens of the present disclosure has excellent optical performances, and meanwhile can meet design requirements of a large aperture, a wide angle and ultra-thin.

Abstract: Provided is a camera optical lens, which includes a first lens having a negative refractive power, a second lens having a positive refractive power, a third lens having a positive refractive power, a fourth lens having a negative refractive power, a fifth lens having a positive refractive power, and a sixth lens having a negative refractive power. The camera optical lens satisfies ?10.00?f1/f??4.00, 0.40?f5/f?0.70, and 8.00?d5/d6?15.00, where f denotes a focal length of the camera optical lens; f1 denotes a focal length of the first lens; f5 denotes a focal length of the fifth lens; d5 denotes an on-axis thickness of the third lens; and d6 denotes an on-axis distance from an image side surface of the third lens to an object side surface of the fourth lens. The camera optical lens has good optical performance and satisfies design requirements for ultra-thin, wide-angle lenses having large apertures.

Abstract: Provided is an electrochromic element including: a support; an electrochromic layer over the support; an electrolyte layer over the support; and a sealant resin layer in contact with the electrochromic layer at longitudinal ends of the electrochromic layer in a layer lamination direction, wherein the electrochromic layer contains a polymerized product of an oxidatively color-developable electrochromic composition containing a radical-polymerizable compound, and the sealant resin layer contains a thermosetting material.

Abstract: An imaging lens for use with an operational waveband over any subset of 7.5-13.5 ?m may include a first optical element of a first high-index material and a second optical element of a second high-index material, that may have a refractive index greater than 2.2 in the operational waveband, an absorption per mm of less than 75% in the operational waveband, and an absorption per mm of greater than 75% in a visible waveband of 400-650 nm. Optically powered surfaces of the imaging lens may include a sag across their respective clear apertures that are less than 10% of a largest clear aperture of the imaging lens. Respective maximum peak to peak thicknesses of the first and second optical elements may be similar in size, for example within 15 percent of each other. Ratios of maximum peak to peak thickness to clear aperture and, separately, to sag are also provided.

Abstract: An optical imaging lens, in order from an object side to an image side along an optical axis, includes a first lens having negative refractive power; a second lens; a third lens cemented with the second lens to form a first compound lens having negative refractive power; a fourth lens having positive refractive power; a fifth lens; a sixth lens cemented with the fifth lens to form a second compound lens having positive refractive power; a seventh lens having positive refractive power. The optical imaging lens could provide a better optical performance of high image quality and low distortion.

Abstract: The present disclosure provides electroretinography devices configured to detect biopotential signals from an eye of a subject. In some embodiments, the device is configured to prevent the subject's eyelids from closing over the device when placed in contact with the anterior surface of the subject's eye. In some embodiments, the device has a Young's modulus of no more than about 50 MPa. In some embodiments, the device includes a diffusing or refracting element configured to scatter, focus or diverge incident light. In other embodiments, the device includes a void through which incident light can enter the subject's eye without passing through any portion of the device.