Abstract: Disclosed is a small lens system including a first lens, a second lens, a third lens, a fourth lens, and a fifth lens sequentially arranged from an object, wherein the clear aperture of an object-side surface L1S1_CA (clear aperture) and the clear aperture of an image-side surface L1S2_CA (clear aperture) of the first lens satisfy 1<L1S2_CA/L1S1_CA<1.2.

Abstract: Disclosed is a small lens system including a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens sequentially arranged from an object, wherein the first lens has a refractive power (P1) satisfying ?0.01<P1<0.01, the second lens has a refractive power (P2) satisfying 0.4<P2, the third lens has a negative refractive power, the third lens having a curvature (C6) of an image-side surface satisfying ?0.01<C6<0.01, the fourth lens has a refractive power (P4) satisfying ?0.1<P4<0.1, the fifth lens has a refractive power (P5) satisfying 0.7<P5, the sixth lens has a refractive power (P6) satisfying P6<?0.7, and the total optical path length (TOPL) of the lens system and an image height (Himg) satisfy TOPL/Himg<1.8.

Abstract: A lens system for LiDAR is proposed. The lens system includes: a lens part comprising a plurality of lenses to converge light provided from the light source; and a filter part included in the lens part and configured to transmit the light having a specific wavelength or the light belonging to a specific wavelength band, wherein the filter part is arranged at a specific position of the lens part such that an angle of light incident on the filter part is between 0 and 25 degrees. Accordingly, the lens system for lidar with high efficiency, high resolution, and high performance is provided by arranging the filter part at the position where the angle of light incident inside the lens part composed of the plurality of lenses is minimized.

Abstract: Disclosed is a small wide-angle lens system including a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, and a ninth lens sequentially arranged from an object, wherein the first lens has a convex object-side surface, the third lens has a negative refractive power, the fourth lens has a concave image-side surface, the sixth lens has a concave object-side surface and a concave image-side surface, the ninth lens has a negative refractive power and a concave object-side surface, all surfaces of the first to ninth lenses are aspherical surfaces, the refractive power P1 of the first lens satisfies |P1|<0.01, and Fno of the lens system satisfies Fno <1.6.

Abstract: A small lens system for developing a close tolerance is proposed. The small lens system includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens that are arranged in order along an optical axis from an object. Refractive power P1 of the first lens satisfies ?0.01<P1<0.01, the second lens is shaped with opposite convex surfaces, and refractive power P2 of the second lens satisfies P2>0.4, the third lens has negative refractive power, and a rear surface curvature C6 of the third lens satisfies ?0.01<C6<0.01, refractive power P4 of the fourth lens satisfies ?0.1<P4<0.1, refractive power P5 of the fifth lens satisfies P5>0.7, and refractive power P6 of the sixth lens satisfies P6<?0.7.

Abstract: A self-aligning camera lens assembly, in which a plurality of lenses is assembled in a lens barrel, includes a front lens having a coupling portion formed outside an effective diameter on a rear surface thereof, and a rear lens positioned behind the front lens, having a coupling groove formed outside an effective diameter on a front surface thereof to be coupled to the coupling portion, and combined with the front lens with optical axes aligned, in which a radius (R) of curvature of the coupling portion of the front lens and an angle (V) of an apex of the coupling groove of the rear lens satisfy R>0.05 mm and 60°<V<120°.

Abstract: Disclosed is a small lens system including a first lens, a second lens, and a third lens sequentially arranged from an object along an optical axis, wherein the thickness (ct1) of the first lens, the thickness (ct3) of the second lens, and the thickness (ct5) of the third lens satisfy ct1/ct3>1.5 and ct1/(ct3+ct5)>0.8, the refractive power (P2) of the second lens satisfies ?0.01<P2<0.01, the lens thickness (et) at a predetermined height and the center thickness (ct) of the second lens thereof satisfy |et?ct|<5 ?m up to 30% of the height of the rear effective diameter thereof and satisfy et?ct<?20 ?m at 70% of the height of the rear effective diameter thereof, and the f-number of the lens system is less than 1.7.

Abstract: Disclosed is a small lens system including a first lens, a second lens, a third lens, and a fourth lens sequentially arranged from an object along an optical axis, wherein the thickness (ct1) of the first lens, the thickness (ct3) of the second lens, the thickness (ct5) of the third lens, and the thickness (ct7) of the fourth lens satisfy ct1+ct3>ct5+ct7, ct1>ct3, ct1>ct5, and ct1>ct7, the front surface of the first lens is convex toward the object while the SAG amount of the first lens is increased depending on the height thereof, the refractive power (P2) of the second lens satisfies ?0.01<P2<0.01, the front curvature (C3) and the rear curvature (C4) of the second lens satisfy |C3|<0.1 and |C4|<0.1, and the f-number of the lens system is less than 1.4.

Abstract: Disclosed is a small lens system including a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens sequentially arranged from an object, wherein the first lens has a convex surface facing the object, the second lens has a convex surface facing the object and a positive refractive power, the third lens has a positive or negative refractive power, the fourth lens has opposite surfaces convex toward an image, the fifth lens has opposite surfaces convex toward the image, the sixth lens has at least one aspherical surface and is configured such that the object-side surface of the sixth lens is convex in the vicinity of an optical axis, and the seventh lens has at least one aspherical surface and is configured such that at least one inflection point is provided on the aspherical surface of the seventh lens.

Abstract: Disclosed is a small lens system including a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens sequentially arranged from an object, wherein the first lens has a positive refractive power, the second lens has a negative refractive power, the third lens has a positive refractive power, the fourth lens has a negative refractive power, the fifth lens is convex toward the object, is concave toward an image, and has a positive refractive power, the sixth lens has a positive or negative refractive power and is provided with at least one inflection point, and the seventh lens has a positive or negative refractive power and is configured such that the radii of curvature R71 and R72 of the object-side surface and image-side surface of the seventh lens satisfy R71=? and R72=?, respectively.

Abstract: Disclosed is a small lens system including 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, wherein the first lens has a lens surface convex toward an object, the second lens has a lens surface convex toward the object, the third lens has a lens surface convex toward the object, the fourth lens has a positive refractive power, the fifth lens has a negative refractive power, the sixth lens has a lens surface convex toward an image, the seventh lens has a positive refractive power and is configured such that a lens surface is convex toward the object in the vicinity of an optical axis, and the eighth lens has a negative refractive power and is configured such that an object-side surface and an image-side surface are concave in the vicinity of the optical axis.

Abstract: A small lens system having five lenses arranged along an optical axis from a focal object side in order of a first, a second, a third, a fourth, and a fifth lens is proposed. A center interval (T12c) of the first and the second lens is T12c<0.2 mm, and an effective outermost interval (T12e) satisfies T12e<0.2 mm. The fifth lens has a positive refractive power, a front surface convex toward the focal object, a rear curvature (C10) satisfying ?0.01<C10<0.01, and the periphery of a rear surface convex upwards. A center interval (T45c) of the fourth and the fifth lens is T45c<0.1 mm and an effective outermost distance (T45e) thereof satisfies T45e>0.35 mm. Thicknesses of each lens from the first to the fifth lens and a distance (TL) from the front to the rear surface of the lens system satisfy (ct1+ct2+ct3+ct4+ct5)/TL<0.47.

Abstract: A small wide-angle lens system having six lenses is proposed. In the lens systems, a first lens is biconvex toward a focal object, with center thickness (Tc) and thickness (Te) of the outermost effective diameter satisfying 1.1<Tc/Te<1.5, and a refractive power (P1) satisfying—0.06<P1<0.06. A second lens has a positive refractive power, a front surface convex toward the focal object, and a radius of curvature (R4) of the rear surface satisfying 10<|R4|. A third lens has a negative refractive power, a rear surface concave toward an image and a radius of curvature (R5) of the front surface satisfying 10<|R5|. A distance interval (T12) in an effective diameter of the first and second lenses satisfies T12<0.2 mm, and a distance interval (T23) within an effective diameter of the second and third lenses satisfies T23<0.1 mm.

Abstract: A telephoto lens system having a plurality of lenses toward a focal object is proposed. The system includes a first lens with a positive refractive power, a second lens with a negative refractive power, a third lens with a negative refractive power, a fourth lens with a negative refractive power, and a fifth lens with a positive refractive power. A refractor bending an optical axis is provided between the second lens and the third lens. The angle (A) between the optical axes of the second lens and the third lens satisfies 80°?A?86°. A barrel surrounding the first lens is provided by protruding more toward the focal object than the first lens. The inner diameter of the barrel is smaller than or equal to the effective diameter of the first lens, and a stop is arranged toward the focal object of the first lens.

Abstract: The present invention relates to a high-resolution wide angle lens system consisting of a total of six lens, wherein the first lens has a negative refractive power, the second lens has a positive refractive power, the third lens has a positive or negative refractive power, the fourth lens has a positive or negative refractive power, the fifth lens has a positive or negative refractive power with a concave shape on an object side and a convex shape on an image side, and the sixth lens has a positive or negative refractive power, and the system is satisfied with 0<|f/f5|<1 (herein, f represents an effective focal length of the entire lens system, and f5 represents an effective focal length of the fifth lens).

Abstract: The present invention relates to a lens system for a head-up display. The technical gist of the present invention is to provide a lens system for a head-up display, comprising: a first group of lenses positioned toward a screen with reference to a diaphragm; and a second group of lenses positioned toward an image element, wherein each lens is combined/arranged such that the DN/DT (abs.) (temperature coefficients of refractive index (10?6/° C. at 632.8 nm)) value of a lens that satisfies |P|>=40 (P is refractive power of each lens), among the plurality of lenses constituting the first and second groups of lenses, has a positive number value or a negative number value according to the refractive power, and the lens system accordingly has thermal compensation characteristics by controlling the amount of change in the focal distance of each lens.

Abstract: The present invention relates to a lens system for a head-up display. The technical gist of the present invention is to provide a lens system for a head-up display for avoiding a ghost image, comprising: a first group of lenses positioned toward a screen with reference to a diaphragm; and a second group of lenses arranged toward an image element, wherein, among the second groups of lenses, a lens positioned toward the image element and in direct proximity to the diaphragm is shaped to be concave toward the screen; the first group of lenses have negative refractive power; the second group of lenses have positive refractive power; and |f1|>|f2| is satisfied (wherein f1 refers to the effective focal distance of the first group of lenses, and f2 refers to the effective focal distance of the second group of lenses).

Abstract: An optical film, a display device including the same, and a method of manufacturing the optical film, the film including a first refractive index layer including a plurality of protrusions; a second refractive index layer covering the plurality of protrusions, the second refractive index layer having a refractive index that is different from a refractive index of the first refractive index layer; and a support layer on the first refractive index layer or the second refractive index layer, wherein a ratio of a height to a width of the protrusion is 0.5 or more.

Abstract: An iris recognition lens system including a first lens and a second lens disposed on an optical axis and sequentially from an object to take an image of an iris and a pupil. A front part of the first lens includes a reflecting area in a central portion and a transmitting area in a circumferential portion. A rear part of the first lens includes a concave transmitting area in a central portion and a reflecting area in a circumferential portion. The second lens is disposed at a rear of the transmitting area in the central portion of the rear part of the first lens. A plurality of reflecting areas and a plurality of transmitting areas are provided in a single lens in order to reduce the length of the lens and increase a focal length, thereby reducing the length of the entire iris recognition lens system.

Abstract: A photographic lens system includes first to sixth lenses arranged sequentially from an object along the optical axis. The first lens has positive refractive power, the second lens is meniscus shaped and has negative refractive power, the third lens has an upwardly-convex shape and positive refractive power, the fourth lens has an upwardly-convex shape and negative refractive power, the fifth lens has positive refractive power, and the sixth lens has negative refractive power. The photographic lens system satisfies ?10<f2/f1<0 and L2te/L2tc<L16tc. The radius of curvature of an object-side lens surface of the third lens has a negative value, and the radius of curvature of an image-side surface of the third lens has a negative value. This reduces the tightness of manufacturing tolerance while reducing the size and weight of the lens system, thereby improving the reproducibility of performance of the lens system.