Abstract: An optical imaging lens includes a first lens element to a seventh lens element, and each lens element has an object-side surface and an image-side surface. The second lens element has negative refracting power, an optical axis region of the object-side surface of the fifth lens element is concave, and an optical axis region of the object-side surface of the seventh lens element is convex. Lens elements included by the optical imaging lens are only the seven lens elements described above, and the following relationships: V5+V6+V7?140.000, (ImgH+D61t72)/D11t42?2.400, V4?30.000 are satisfied.

Abstract: The disclosure discloses an optical imaging lens, which sequentially includes, from an object side to an image side along an optical axis: a first lens having positive refractive power; a second lens having refractive power; a third lens having refractive power; a fourth lens having negative refractive power, wherein an object-side surface thereof is a concave surface, while an image-side surface is a convex surface; a fifth lens having positive refractive power; and a sixth lens having negative refractive power, wherein an object-side surface thereof is a convex surface. TTL is a distance from an object-side surface of the first lens to an imaging surface of the optical imaging lens on the optical axis, ImgH is a half of a diagonal length of an effective pixel region on the imaging surface of the optical imaging lens, TTL and ImgH meet 4.0 mm<ImgH/(TTL/ImgH)<7.0 mm. Therefore, the optical imaging lens has high imaging quality.

Abstract: A photographing optical lens assembly includes eight 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 and an eighth lens element. Each of the eight lens elements has an object-side surface towards the object side and an image-side surface towards the image side. The first lens element has positive refractive power. The object-side surface of the fifth lens element is concave in a paraxial region thereof. The image-side surface of the sixth lens element is concave in a paraxial region thereof. The object-side surface of the seventh lens element is convex in a paraxial region thereof. The image-side surface of the eighth lens element is concave in a paraxial region thereof.

Abstract: An optical imaging system includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens sequentially disposed in numerical order along an optical axis of the optical imaging system from an object side of the optical imaging system toward an imaging plane of the optical imaging system, wherein the optical imaging system satisfies 1<|f123457?f|/f, where f123457 is a composite focal length of the first to seventh lenses calculated with an index of refraction of the sixth lens set to 1.0, f is an overall focal length of the optical imaging system, and f123457 and f are expressed in a same unit of measurement.

Abstract: A wire-grid polarizer includes metal reflectors which are embedded in a large number of grooves formed in a one-dimensional grid pattern in the same direction and with the same period in the front surface of a transparent sheet, wherein the average width (a) of the metal reflectors is 200 nm or less, the ratio (b/a) of the average thickness (b) of the metal reflectors from the front side of the sheet to the tip in the backward direction to the above average width (a) is 4 to 25, in any cross-section perpendicular to the surface of the sheet, the shape of each of the metal reflectors in the vicinity of the tip in the thickness direction is such that it gradually becomes thinner in a linear or smoothly curved shape toward the tip, and the ratio of the average length (c) toward the tip of portions that gradually become thinner toward the tip to the above average width (a) is 1.2 or more.

Abstract: An optical lens system comprising ten lens elements, the ten lens elements being, 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, a sixth lens element, a seventh lens element, an eighth lens element, a ninth lens element and a tenth lens element, and each of the ten lens elements having an object-side surface facing toward the object side and an image-side surface facing toward the image side.

Abstract: An optical imaging system includes a first lens group including a first lens and a second lens, a second lens group including a third lens, a fourth lens, and a fifth lens, and a third lens group including a sixth lens and a seventh lens. The first to seventh lenses are arranged in order from an object side, at least one of the first lens group to the third lens group is moved on an optical axis to change a distance between the first lens group to the third lens group, and the following conditional expression is satisfied: 0.2<BFL/(2*IMG HT)<2.0 where BFL is a distance on the optical axis from an image-side surface of the seventh lens to an imaging surface of an image sensor, and IMG HT is half a diagonal length of the imaging surface of the image sensor.

Abstract: The building of systems on breadboards such as optomechanical systems using reference stop assemblies is presented. Each reference stop assembly has a threaded base engageable with the breadboard to removably mount the reference stop assembly thereto, a support shaft connected to the threaded base and a reference ball. The reference ball is captively mounted to the support shaft and has a translational play in a plane perpendicular to the support shaft. The reference stop assembly also includes a clamping member mounted to the support shaft over the reference ball. The reference stop assembly is configured such that, when the reference stop assembly is mounted to said breadboard, the support shaft projects normally to the mounting surface of the breadboard and the clamping member cooperates with the breadboard so as to apply a clamping force to clamp the reference ball against a circular seat of a mounting hole on the breadboard.

Abstract: There are provided an optical system and an imaging device including the same. The optical system includes: in order from an object side to an image side, a first lens group having refractive power; and a second lens group having positive refractive power. A variable distance that varies during focusing between the first lens group and the second lens group is closer to an object than a variable distance that varies during focusing between other lenses. The first lens group includes a positive lens and at least one or more negative lenses in order from the image side. The second lens group includes a lens subgroup 2A having positive refractive power, an aperture stop, and a lens subgroup 2B having positive refractive power in order from the object side. The lens subgroup 2B includes a negative lens and a positive lens in order from the object side and satisfies a predetermined Conditional Expression.

Abstract: The present disclosure discloses a lens device, which comprises a holder, a calibrated member, a lens module and a clamping member. The holder comprises a mounting plane and an accommodating portion. The calibrated member is disposed on the mounting plane of the holder. The calibrated member has a through hole and an internal thread. The lens module comprises an external thread. The lens module passes through the through hole of the calibrated member, the external thread and the internal thread fit each other, and part of the lens module is disposed in the accommodating portion. The clamping member comprises an engagement portion and an elastic arm. The engagement portion clamps the holder, and part of the elastic arm touches a surface of the calibrated member opposite to the mounting plane.

Abstract: An imaging optical lens system includes eight 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 and an eighth lens element. The first lens element has positive refractive power. The second lens element has negative refractive power. The seventh lens element has an image-side surface being concave in a paraxial region thereof, and the image-side surface of the seventh lens element has at least one convex critical point in an off-axis region thereof.

Abstract: A photographing optical lens system includes seven lens elements which are, 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, 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 object-side surface of the first lens element is convex in a paraxial region thereof. The seventh lens element has negative refractive power. The object-side surface of the seventh lens element is concave in a paraxial region thereof. At least one of all lens surfaces of the seven lens elements is aspheric and has at least one inflection point.

Abstract: An optical image 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: There is provided an imaging lens with excellent optical characteristics which satisfies demand of wide field of view, low profile and low F-number. An imaging lens comprises, in order from an object side to an image side, a first lens, an aperture stop, a second lens with positive refractive power in a paraxial region, a third lens with negative refractive power in the paraxial region, a fourth lens, a fifth lens with the positive refractive power in the paraxial region, a sixth lens being a double-sided aspheric lens, and a seventh lens with negative refractive power having an image-side surface being concave in the paraxial region and an aspheric surface having at least one pole point in a position off the optical axis.

Abstract: An optical imaging system includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens, sequentially arranged from an object side optical imaging system, and a refractive index of at least one of the lenses is 1.67 or greater.

Abstract: An optical imaging lens may include 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, and an eighth lens element positioned in an order from an object side to an image side along an optical axis. Through designing concave and/or convex surface of the lens elements, the optical imaging lens may have improved imaging quality, reduced system length, enlarged aperture, and broad field of view while the optical imaging lens may satisfy at least one inequality.

Abstract: This application provides an example optical lens, an example camera module, and an example terminal. One example lens includes a first lens with a negative focal power, a second lens with a positive focal power, a third lens with a negative focal power, a fourth lens with a positive focal power, a fifth lens with a positive focal power, a sixth lens with a focal power, and a seventh lens with a focal power that are sequentially arranged along an optical axis from an object side to an image side. The first lens includes an object side surface that is concave near the optical axis and an image side surface that is convex near the optical axis. The seventh lens is an M-shaped lens and includes an object side surface that is convex near the optical axis and an image side surface that is concave near the optical axis.

Abstract: Provided a wide-angle lens includes: first lens, second lens, third lens, fourth lens, fifth lens, sixth lens, and seventh lens arranged sequentially from object surface to image surface along optic axis; first lens and sixth lens are negative focal power lenses, third lens, fourth lens, fifth lens, and seventh lens are positive focal power lenses, and second lens is negative or positive focal power lens; focal lengths of first lens, second lens, third lens, fourth lens, fifth lens, sixth lens, seventh lens, and the wide-angle lens are f1, f2, f3, f4, f5, f6, f7 and f respectively, satisfying: 0.3?|f1/f|?2.6, |f2/f|?2, 2.3?|f3/f|?7.2, |f4/f|?0.8, 0.67?|f5/f|?2.94, 0.32?|f6/f|?2.77, and |f7/f|?0.16. The wide-angle lens can satisfy surveillance requirements of high definition and small distortion while ensuring low cost.

Abstract: An optical imaging system includes four lens elements which are, in order from an object side to an image side: a first lens element, a second lens element, a third lens element and a fourth lens element. Each of the four lens elements of the optical imaging system has an object-side surface facing toward the object side and an image-side surface facing toward the image side. The object-side surface of the first lens element is concave in a paraxial region thereof, and the image-side surface of the first lens element is convex in a paraxial region thereof. The object-side surface of the fourth lens element is convex in a paraxial region thereof, the image-side surface of the fourth lens element is concave in a paraxial region thereof, and the image-side surface of the fourth lens element has at least one convex shape in an off-axis region thereof.

Abstract: An optical imaging lens includes, sequentially from an object side to an image side along an optical axis, a first to seventh lens elements each having an object-side surface and an image-side surface. The optical imaging lens satisfies EFL/(G12+G67)?5.600, wherein EFL is an effective focal length of the optical imaging lens, G12 is an air gap from the first lens element to the second lens element along the optical axis, and G67 is an air gap from the sixth lens element to the seventh lens element along the optical axis.