Abstract: An optical system, a lens module, and a terminal device are provided. The optical system includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. The first lens with a positive refractive power has an object-side surface which is convex at an optical axis. The second lens with a negative refractive power has an image-side surface which is concave at the optical axis. The third lens with a negative refractive power has an object-side surface which is convex at the optical axis and an image-side surface which is concave at the optical axis. The fourth lens with a negative refractive power has an image-side surface which is concave at the optical axis. The fifth lens and the sixth lens have the refractive power. The optical system satisfies expression 1<ftLtl4/ftGtl4<1.5.

Abstract: An optical lens assembly, sequentially comprising from an object side to an image side: a first lens; a second lens having positive refractive power, the object side surface of the second lens being concave at the circumference, and the image side surface of the second lens being convex at the circumference; a third lens; and a fourth lens having positive refractive power, the image side surface of the fourth lens being concave at the optical axis, the object side surface and the image side surface of the fourth lens being aspherical, and at least one of the object side surface and the image side surface of the fourth lens having an inflection point. The optical lens assembly satisfies relationship: TT/f<1.3, TT is the distance on the optical axis from the object side surface of the first lens to the image side surface of the fourth lens, and f is effective focal length.

Abstract: An optical system (10) includes, successively from an object side to an image side, a first lens unit (110) having a positive refractive power, a second lens unit (120) having a negative refractive power, a third lens unit (130) and a fourth lens unit (140) having a positive refractive power ; the positions of the first lens unit (110) and the fourth lens unit (140) are fixed with respect to the imaging surface (S17) of the optical system (10), and the second lens unit (120) and the third lens unit (130) are movable with respect to the first lens unit (110) in the optical axis direction of the optical system (10); when the optical system is zoomed from the short focal end to the long focal end, a distance between the first lens unit (110) and the second lens unit (120) and the distance between the third lens unit (130) and the fourth lens unit (140) increase.

Abstract: An optical system includes a first lens having a positive refractive power; a second lens having a refractive power; a third lens having a negative refractive power and an object side surface and an image side surface being concave at circumferences; a fourth lens having a negative refractive power; a fifth lens having a positive refractive power and an object side surface and an image side surface being aspherical, and at least one of the object side surface and the image side surface having an inflection point; and a sixth lens having a negative refractive power. 0.60<CT1/SD11<1.01; 5.5<TTL/CT1<9.0; CT1 is a thickness of the first lens, SD11 is half of a maximum effective aperture of an object side surface of the first lens, TTL is a distance from the object side surface of the first lens to an imaging plane.

Abstract: An optical system, sequentially from an object side to an image side, includes: a first lens having a positive refractive power, an object side surface of the lens being convex at an optical axis, and an image side surface thereof being concave at the optical axis; a second lens having a negative refractive power, an object side surface of the lens being convex at the optical axis, and an image side surface thereof being concave at the optical axis; a third lens, a fourth lens, a fifth lens, and a sixth lens that have a refractive power; a seventh lens having a positive refractive power, an object side surface of the lens being convex at the optical axis, and an image side surface thereof being concave at the optical axis; and an eighth lens having a negative refractive power. The optical system satisfies the condition: 0.2<DL/Imgh<0.5.

Abstract: A low-reflection structure, a lens barrel, and an electronic device are provided. The low-reflection structure includes a light-transmission region and a light-extinction surface arranged around a circumference side of the light-transmission region. Multiple light-extinction groups are disposed at the light-extinction surface, and the multiple light-extinction groups are arranged circumferentially around the light-transmission region. Each light-extinction group has multiple light-extinction structures, and the multiple light-extinction structures of each light-extinction group are all arranged in a radial direction of the light-transmission region.

Abstract: The present disclosure provides an optical imaging system, an image capturing module, and an electronic device. The optical imaging system includes, sequentially from an object side to an image side, a first lens having negative refractive power, a second lens having refractive power, a third lens having positive refractive power, a fourth lens having refractive power, a fifth lens having negative refractive power, and a sixth lens having positive refractive power. The optical imaging system satisfies the following condition: 87.0°/mm<FOV/f?128.0°/mm; where FOV is a maximum field of view of the optical imaging system and f is an effective focal length of the optical imaging system.

Abstract: A lens system includes, sequentially from an object side to an image side, a first optical path folding element located on a first part of the folded optical axis and configured to direct light from the first part of the folded optical axis to a second part of the folded optical axis; a lens group located on the second part of the folded optical axis; a second optical path folding element configured to direct light from the second part of the folded optical axis to a third part of the folded optical axis; and a third optical path folding element configured to direct light from the third part of the folded optical axis to a fourth part of the folded optical axis. The second part, the third part, and the fourth part are located within a same plane that is perpendicular to the first part.

Abstract: An optical system, sequentially comprising from an object side to an image side: a diaphragm; a first lens having positive refractive power; a second lens having negative refractive power, an object-side surface of the second lens being convex in a paraxial region; a third lens, a fourth lens, and a fifth lens which have refractive power; and a sixth lens having negative refractive power, an image-side surface of the sixth lens being concave in a paraxial region. The optical system satisfies the following relationship: (TTL-BFL)/f<0.92, TTL being a distance from an object-side surface of the first lens to an imaging surface of the optical system on an optical axis, BFL being the shortest distance from the image-side surfaceof the sixth lens to the imaging surface in a direction parallel to the optical axis, and f being an effective focal length of the optical system.

Abstract: An imaging lens (100). The imaging lens (100) sequentially consists of, from the object side to the image side: a first lens (L1) having refraction power, the object side surface (S1) of the first lens (L1) being a convex surface at the optic axis; a second lens (L2) having refraction power, the object side surface (S3) of the second lens (L2) being a convex surface at the optic axis; and a third lens (L3) having refraction power. The imaging lens (100) satisfies the condition that FNO*L>15.5, wherein FNO represents an f-number of the imaging lens (100), L represents an aperture diameter of the first lens (L1), and the unit of L is mm.

Abstract: A lens structure, comprising: a lens barrel having a hollow structure, comprising an object side end face and an image side end face; a lens group, comprising multiple lenses arranged in the lens barrel, the multiple lenses being sequentially arranged from the image side end face to the object side end face, the lens located on an end of the lens group and close to the object side end face being a first lens, the first lens comprising a first optical portion and a first mounting portion connected together, the first mounting portion being on the first optical portion; a light shielding sheet, separated from the lens barrel, arranged on the object side end face, and extending to an object side face of the first mounting portion, an object side face of the first optical portion being exposed from an object side face of the light shielding sheet.

Abstract: An optical system, a lens module, and an electronic device are provide. The optical system includes, in order from an object side to an image side along an optical axis, a first lens with a refractive power, a second lens with a 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, a sixth lens with a negative refractive power, and a seventh lens with a refractive power. The second lens has an object-side surface which is convex and an image-side surface which is concave. The third lens has an image-side surface which is convex. The fourth lens has an object-side surface which is concave and an image-side surface which is convex. The optical system further includes a stop, and the optical system satisfies the following expression: 1.2<Imgh/fno×L<1.4.

Abstract: An optical system, a lens module, and an electronic device are provide. The optical system includes, in order from an object side to an image side along an optical axis, a first lens with a positive refractive power, a second lens with a negative refractive power, a third lens with a refractive power, a fourth lens with a refractive power, a fifth lens with a refractive power, a sixth lens with a refractive power, and a seventh lens with a negative refractive power. The optical system further includes a stop, and the optical system satisfies the following expression: 1.5<TTL/D<2.5.

Abstract: An optical system (100), sequentially comprising from an object side to an image side: a first lens (L1) having positive refractive power, an object-side surface (S1) of the first lens (L1) being a convex surface at the circumference; a second lens (L2), a third lens (13), a fourth lens (L4), a fifth lens (L5), a sixth lens (L6), and a seventh lens (L7) having refractive power; and an eighth lens (L8) having negative refractive power. An image-side surface (S14) of the seventh lens (L7) is a concave surface at the optical axis. In addition, the optical system (100) satisfies 1<TTL/<2.5, wherein TTL is the distance between the object-side surface (S1) of the first lens (L1) and an imaging surface (S19) of the optical system (100) on the optical axis. The optical system (100) further comprises a diaphragm (STO), and L is the effective aperture diameter of the diaphragm (STO).

Abstract: An optical lens group comprises, in order from the object-side to the image-side: a first lens having positive refractive power, a second lens having positive refractive power, a third lens having negative refractive power, a fourth lens having negative refractive power, a fifth lens having positive refractive power, and a sixth lens having negative refractive power. The object-side surface of the first lens is concave at the perimeter of said lens, the image-side surface of said lens is convex at the perimeter of said lens; the image-side surface of the second lens is convex; the image-side surface of the third lens is concave, the object-side surface and the image-side surface of the fourth lens are both concave at the optical axis; the object-side surface of the fifth lens is concave at the perimeter of said lens; and the image-side surface of the sixth lens is concave at the optical axis.

Abstract: An optical system, a lens module, and an electronic device are provide. The optical system includes a first lens having a positive refractive power, a second lens having a refractive power, a third lens having a refractive power, a fourth lens having a refractive power, a fifth lens having a refractive power, a sixth lens having a positive refractive power, a seventh lens having a negative refractive power which are sequentially arranged from an object side to an image side along an optical axis of the optical system. The first lens has an object-side surface which is convex near the optical axis. The seventh lens has an image-side surface which is concave near the optical axis. The optical system satisfies the following expression: 4?(Y72*TL)/(ET7*f)?10.

Abstract: An optical system, a lens module, and a terminal device are provided. The optical system includes a first lens and a fifth lens, each of which has a positive refractive power. The optical system also includes multiple lenses with refractive powers. Each of the first lens, a second lens, and a seventh lens has an object-side surface which is convex at an optical axis. Each of the third lens and a fifth lens has an image-side surface which is convex at the optical axis. The seventh lens has an image-side surface which is concave at the optical axis. The seventh lens has an inflection point on the object-side surface and/or the image-side surface. The optical system satisfies the expressions tan ?/ƒ>0.21 mm?1 and Y2/Y1+Y3/Y1+Y4/Y1<3.1.

Abstract: An optical system, a lens module, and a terminal device are provided. The optical system includes a first lens with a positive refractive power, a second lens with a refractive power, a third lens with a refractive power, a fourth lens with a positive refractive power, and a fifth lens with a refractive power. The first lens has an object-side surface which is convex at an optical axis. The third lens has an object-side surface which is concave at the optical axis. The fourth lens has an image-side surface which is convex at the optical axis. The fifth lens has an object-side surface which is concave at the optical axis and an image-side surface which is convex at the optical axis. The optical system satisfies the following expression: 0.25<ftgtl3/ftltl3<0.8.

Abstract: An optical system, a lens module, and an electronic device are provide. The optical system includes, in order from an object side to an image side along an optical axis, a first to seventh lenses. Each of the first lens, the third lens, and the sixth lens has a positive refractive power. Each of the second lens and the seventh lens has a negative refractive power. Each of the second lens, the third lens, and the sixth lens has an object-side surface which is convex near the optical axis. Each of the second lens and the seventh lens has an image-side surface which is concave near the optical axis. The third lens has an image-side surface which is convex near a periphery of the image-side surface of the third lens. The seventh lens has an object-side surface which is convex near the optical axis.

Abstract: An optical system includes, in order from an object side to an image side along an optical axis, first to seventh lenses. The fifth lens has a refractive power. The fifth lens has an object-side surface which is concave near a periphery of the object-side surface of the fifth lens, and an image-side surface which is convex near a periphery of the image-side surface (S10) of the fifth lens. The sixth lens has a refractive power. The sixth lens has an object-side surface which is concave near a periphery of the object-side surface of the sixth lens, and an image-side surface which is convex near a periphery of the image-side surface of the the sixth lens. The seventh lens has a negative refractive power. The seventh lens has an object-side surface which is convex near the optical axis, and an image-side surface which is concave near the optical axis.