Abstract: An image capturing lens system includes, in order from an object side to an image side, a first lens element with positive refractive power having an object-side surface being convex in a paraxial region thereof and an image-side surface being concave in a paraxial region thereof, a second lens element with negative refractive power having an object-side surface being concave in a paraxial region thereof and an image-side surface being convex in a paraxial region thereof, a third lens element with positive refractive power having an object-side surface being concave in a paraxial region thereof and an image-side surface being convex in a paraxial region thereof, and a fourth lens element with negative refractive power having an object-side surface being convex in a paraxial region thereof and an image-side surface being concave in a paraxial region thereof.

Abstract: An optical system consists of a front lens unit having a positive or negative refractive power, a diaphragm, and a rear lens unit having a positive refractive power, which are arranged in this order from an object side to an image side. The front lens unit includes an aspherical lens that has a positive refractive power on an optical axis, and is disposed closest to an object. The aspherical lens has an aspherical surface on the object side in which an off-axis radius of curvature is larger than an on-axis radius of curvature. A predetermined condition is satisfied.

Abstract: A lens assembly includes a front lens group and a rear lens group. The front lens group includes a first lens having positive refractive power and a second lens having negative refractive power. The rear lens group includes a third lens having positive refractive power and a fourth lens having negative refractive power, wherein the third lens includes a convex surface facing an object side and another convex surface facing an image side and the fourth lens includes a concave surface facing the image side. The first lens, the second lens, the third lens, and the fourth lens are arranged in order from the object side to the image side along an optical axis. The lens assembly satisfies: 13.5 mm<f+f1<20 mm; wherein f is an effective focal length of the lens assembly and f1 is an effective focal length of the first lens.

Abstract: An optical imaging lens device includes, in order from the object side to the image side: a first lens element having positive refractive power and an object-side surface convex in a paraxial region thereof; a second lens element having negative refractive power and an object-side surface concave in a paraxial region thereof; a third lens element having positive refractive power, an object-side surface concave in a paraxial region thereof, and an image-side surface convex in a paraxial region thereof; a fourth lens element having negative refractive power, an object-side surface convex in a paraxial region thereof and concave in an off-axis region thereof, and an image-side surface concave in a paraxial region thereof and convex in an off-axis region thereof. When a certain condition is satisfied, the optical imaging lens device may have both a compact size and wide field of view.

Abstract: Provided is a camera optical lens including, sequentially 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 positive refractive power; and a fourth lens having a negative refractive power. The camera optical lens satisfies following conditions: 2.00?(f1+f3)/f?2.30; ?8.60?(f2+f4)/f??4.80; ?2.10?(R1+R2)/(R1?R2)??1.90; ?4.00?(R3+R4)/(R3?R4)??1.00; and 2.00?(R7+R8)/(R7?R8)?3.40. The camera optical lens can achieve high optical performance while satisfying design requirements for ultra-thin, wide-angle lenses having large apertures.

Abstract: The present disclosure relates to the field of optical lenses and provides a camera optical lens. The camera optical lens satisfies following conditions: 62.00<R7/f4<70.00; 0.10<R1/R2<0.40; and ?0.50<R3/R4<?0.30, where f4 denotes a focal length of the fourth lens; R1 denotes a curvature radius of an object side surface of the first lens; R2 denotes a curvature radius of an image side surface of the first lens; R3 denotes a curvature radius of an object side surface of the second lens; R4 denotes a curvature radius of an image side surface of the second lens; and R7 denotes a curvature radius of an object side surface of the fourth lens.

Abstract: The present disclosure discloses an optical lens assembly. The optical lens assembly includes sequentially a first lens, a second lens, a third lens and a fourth lens from an object side to an image side along an optical axis. The first lens has a positive refractive power, and an object-side surface of the first lens is a convex surface. The second lens has a negative refractive power, and an object-side surface of the second lens is a concave surface. The third lens has a positive refractive power or a negative refractive power. The fourth lens has a negative refractive power. An air spacing T23 between the second lens and the third lens on the optical axis and an air spacing T34 between the third lens and the fourth lens on the optical axis satisfy: T23/T34<0.2.

Abstract: The present invention relates to an optical unit comprising three lens groups, i.e., a first lens group, a second lens group and a third lens group, and an optical unit comprising four lens groups, i.e., a first lens group, a second lens group a third lens group and a fourth lens group, which are arranged in order from an object side toward an image side surface side, wherein one or more of said lens groups comprise a substrate having a curved optical surface, wherein said curved optical surface is provided with a polymer layer.

Abstract: Disclosed is a camera module. The camera module includes: a lens barrel disposed in a housing to receive a lens assembly; an elastic member in at least one of the housing and the lens barrel; a driving unit moving the lens barrel relative to the housing; and a sensor unit fixed to the housing.

Abstract: Disclosed is a camera module. The camera module includes: a lens barrel disposed in a housing to receive a lens assembly; an elastic member in at least one of the housing and the lens barrel; a driving unit moving the lens barrel relative to the housing; and a sensor unit fixed to the housing.

Abstract: A lens assembly includes a first lens, a second lens, a third lens, and a fourth lens, wherein the first lens, the second lens, the third lens, and the fourth lens are arranged in order from an object side to an image side along an optical axis. The first lens is with positive refractive power and includes a convex surface facing the object side. The second lens is with negative refractive power and includes a concave surface facing the image side. The third lens is with refractive power and includes a convex surface facing the image side. The fourth lens is with refractive power. The lens assembly satisfies: FOV?56°, wherein FOV is a field of view of the lens assembly.

Abstract: The present disclosure provides a small-sized camera lens with good optical properties, and comprises four lenses having a bright F-number. The camera 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 positive refractive power and a fourth lens having a negative refractive power. The camera lens satisfies specified relational expressions.

Abstract: A system comprising: a camera configured to capture one or more images of a user's hand; and a computer configured to: receive the one or more captured images, apply a mapping function to the received one or more images, thereby yielding one or more coordinates associated with at least one feature of the user's hand, wherein the mapping function is derived from a set of labeled images that are produced by applying a machine learning algorithm to training data which comprises images of a trainer's hand, wherein the images are labeled with coordinates obtained from multiple magnetic sensors attached to the trainer's hand.

Abstract: An ultra-wide-angle and large-aperture optical lens assembly with a high image quality is provided, including: a first lens, a second lens, a third lens, a fourth lens, and a filter which are arranged sequentially from an object side to an image side, and a diaphragm arranged between the second lens and the object side. The first lens has a positive focal power and includes a convex surface facing toward the image side. The second lens has a negative focal power and includes a concave surface facing toward the object side. The third lens has a positive focal power. The fourth lens has a negative focal power and has an object side surface and an image side surface both being aspheric surfaces, the object side surface of the fourth lens is arranged with an inflexion point. The lens assembly meets the relational expressions: 0.9<TTL/f1<2.5, 0.5<f/|f4|<1.6, and 0.4<D4/D1<0.9.

Abstract: A near infrared lens assembly includes a first lens, a second lens, a third lens and a fourth lens, all of which are arranged in sequence from an object side to an image side along an optical axis. The first lens is with positive refractive power and includes a convex surface facing the object side. The second lens is a meniscus lens and includes a convex surface facing the object side and a concave surface facing the image side. The third lens is a meniscus lens and includes a concave surface facing the object side and a convex surface facing the image side. The fourth lens is with negative refractive power and includes a concave surface facing the object side.

Abstract: A camera lens is disclosed. The camera lens includes four piece ultra-thin and wide angle lenses with excellent optical properties and with chromatic aberration sufficiently corrected as follows: a first lens with positive refractive power; a second lens with negative refractive power; a third lens with positive refractive power; a fourth lens with negative refractive power; which are arranged sequentially from object side. The camera lens is characterized in that it meets specified conditions.

Abstract: A camera lens includes, lined up from the object side to the image side, a first lens with positive refractive power, a second lens with negative refractive power, a third lens with positive refractive power, and a fourth lens with negative refractive power. The camera lens satisfies specific conditions.

Abstract: Provided are a photographic lens and an electronic apparatus including the photographic lens. The photographic lens includes a first lens that has a positive refractive power and includes a biconvex lens, a second lens that has a negative refractive power, a third lens that has a positive refractive power, and a fourth lens that has a negative refractive power. The first, second, third, and fourth lenses are arranged sequentially from an object-side to an image-side.

Abstract: An imaging lens system comprises, in order from an object side to an image side: a first lens element with positive refractive power having a convex object-side surface; a second lens element with refractive power; a third lens element with refractive power having object-side and image-side surfaces being aspheric, at least one surface thereof having at least one inflection point; a fourth lens element with refractive power having a concave object-side surface and a convex image-side surface; a fifth lens element with refractive power having an aspheric object-side surface and an aspheric concave image-side surface, the image-side surface thereof having at least one inflection point.

Abstract: An optical lens system includes, 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. The first lens element with positive refractive power has an object-side surface being convex in a paraxial region thereof. The second lens element has negative refractive power. The third lens element with positive refractive power has an image-side surface being convex in a paraxial region thereof, wherein both of the surfaces thereof are aspheric. The fourth lens element with negative refractive power has an image-side surface being concave in a paraxial region thereof, wherein the image-side surface of the fourth lens element has at least one convex shape in an off-axis region thereof, and both of the surfaces thereof are aspheric. The optical lens system has a total of four lens elements with refractive power.

Abstract: A compact, small F-value imaging lens with a wide field of view which corrects aberrations properly. Its elements are arranged in order from an object side to an image side: an aperture stop, a positive first lens having convex surfaces on the object and image sides, a negative second lens having a concave image-side surface, a meniscus positive third lens having a convex image-side surface, and a negative double-sided aspheric fourth lens having a concave image-side surface. With an F-value smaller than 2.4, it satisfies conditional expressions (1) to (3): 0.8<ih/f<0.95??(1) TLA/2ih<0.9??(2) ?4.0<r3/r4<6.0??(3) where ih: maximum image height f: focal length of the imaging lens overall optical system TLA: total track length r3: curvature radius of the second lens object-side surface r4: curvature radius of the second lens image-side surface.

Abstract: An imaging optical system includes, in order from the object side to the image side, an aperture stop, a first lens element with a positive refractive power having a convex object-side surface, a second lens element with a negative refractive power having a convex image-side surface in the vicinity of an outer circumference, a third lens element with a positive refractive power having a concave object-side surface in a vicinity of an optical axis and a convex image-side surface in the vicinity of the optical axis, and a fourth lens element having a concave image-side surface in the vicinity of the optical axis and a convex image-side surface in the vicinity of the outer circumference. The sum of thicknesses of the first, second, third, and fourth lens elements and the sum of total air gaps therebetween satisfy specific conditions.

Abstract: According to one embodiment, an imaging lens includes a first optical system and a microlens array. The first optical system includes an optical axis. The microlens array is provided between the first optical system and an imaging element. The microlens array includes microlens units provided in a first plane. The imaging element includes pixel groups. Each of the pixel groups includes pixels. The microlens units respectively overlap the pixel groups when projected onto the first plane. The first optical system includes an aperture stop, a first lens, a second lens, a third lens, and a fourth lens. The first lens is provided between the aperture stop and the microlens array. The second lens is provided between the first lens and the microlens array. The third lens is provided between the second lens and the microlens array. The fourth lens is provided between the third lens and the microlens array.

Abstract: A zoom lens includes a positive first lens group, a negative second lens group, a positive third lens group, and a fourth lens group. The first through third lens groups move such that the distance between the first and second lens groups is greater while the distance between the second lens group and the third lens group is less at the telephoto end compared to the wide angle end, and the fourth lens moves with the third lens group. The third lens group includes a fixed positive subgroup, including at least one positive lens and one negative lens, and a movable subgroup provided toward an image side of the fixed lens group including one negative lens that moves perpendicular to an optical axis to correct an image plane when camera shake occurs. The fourth lens group includes a fixed subgroup and a movable subgroup that moves during focusing operations.

Abstract: An imaging lens includes first, second, third, and fourth lens elements arranged from an object side to an image side in the given order. The first lens element has a positive refractive power, and both of the object-side and image-side surfaces thereof have a convex portion near an optical axis of the imaging lens. The object-side and image-side surfaces of the second lens element respectively have a convex portion and a concave portion near the optical axis. The fourth lens has a negative refractive power, and the object-side surface thereof has a concave portion near the optical axis. The imaging lens satisfies EFL/CT1?5.3, where EFL is an effective focal length of the imaging lens, and CT1 is a thickness of the first lens element.

Abstract: An optical lens assembly for image taking includes a first lens element, a second lens element, a third lens element and a fourth lens element. The first lens element with positive refractive power includes a convex object-side surface at a paraxial region. The second lens element with negative refractive power includes a concave object-side surface at a paraxial region. The third lens element with refractive power includes a concave object-side surface at a paraxial region and a convex image-side surface at a paraxial region. The fourth lens element made of plastic with negative refractive power includes a concave object-side surface at a paraxial region and an image-side surface. Both of the object-side surface and the image-side surface of the fourth lens element are aspheric, and the image-side surface of the fourth lens element is concave at a paraxial region and convex at a peripheral region.

Abstract: An image pickup optical system includes in order from an object side, a first lens having a positive refractive power, a second lens having a negative refractive power, a third lens having a positive refractive power, and a fourth lens having a negative refractive power. The first lens has a biconvex shape. An image-side surface of the second lens has a shape such that, a concave surface is directed toward an image side. At least an image-side surface of the third lens has a shape such that, a convex surface is directed toward the image side. An aperture is disposed nearest to the object side, and the following conditional expression (1) is satisfied: 0.9<f1/f??(1), where f1 denotes a focal length of the first lens and f denotes a focal length of the overall image pickup optical system.

Abstract: An imaging lens includes plastic-made first, second, third, and fourth lens elements arranged in the given order from an object side to an imaging side. The first lens element has a positive focusing power and is biconvex. The second lens element has a negative focusing power, is biconcave, and has an abbe number not greater than 30. The third lens element has a positive focusing power and has a convex imaging-side surface facing toward the imaging side. The fourth lens element has an imaging-side surface formed with a concave area in a vicinity of an optical axis of the fourth lens element. The imaging lens further includes an aperture stop disposed between the first and second lens elements.

Abstract: An optical image capturing lens assembly includes four non-cemented lens elements, 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. The first lens element with positive refractive power has a convex object-side surface. The second lens element with negative refractive power has a concave object-side surface and a convex image-side surface. The third lens element with positive refractive power has a convex object-side surface and a convex image-side surface, and is made of plastic material, wherein the surfaces of the third lens element are aspheric. The fourth lens element with negative refractive power has a concave object-side surface and a convex image-side surface, and is made of plastic material, wherein the surfaces of the fourth lens element are aspheric.

Abstract: An imaging lens comprising, in order from the object side: an aperture stop; a positive first lens having convex object-side and image-side surfaces; a double-sided aspheric negative second lens having a concave object-side surface; a meniscus double-sided aspheric positive third lens having a convex image-side surface; and a meniscus double-sided aspheric negative fourth lens having a concave image-side surface. All of the lenses are made of a plastic material.

Abstract: Designed for a solid-state image sensor, it includes, in order from an object side to an image side: a first positive lens having a convex object-side surface; a second negative lens having a concave image-side surface; a third positive meniscus lens having a convex image-side surface; and a fourth negative lens having concave object-side and image-side surfaces near an optical axis. A first diffraction optical surface is formed on one lens surface of the first to third lenses, and a second one is formed on the fourth lens object-side surface. The imaging lens satisfies a conditional expression below, 0.0<r6/r7<0.1, where r6 denotes the curvature radius of the third lens image-side surface, and r7 denotes that of the fourth lens object-side surface.

Abstract: An image capturing system includes, 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. The first lens element with positive refractive power has a convex object-side surface at a paraxial region. The second lens element with negative refractive power has a concave image-side surface. The third lens element with positive refractive power has a convex object-side surface at a paraxial region and a convex image-side surface at a paraxial region. The fourth lens element with negative refractive power has a concave image-side surface at a paraxial region, wherein the image-side surface of the fourth lens element has a convex shape at a peripheral region, and both of the surfaces of the fourth lens element are aspheric. The image capturing system has a total of four lens elements with refractive power.

Abstract: An imaging lens includes plastic-made first, second, third, and fourth lens elements arranged in the given order from an object side to an imaging side. The first lens element has a positive focusing power and is biconvex. The second lens element has a negative focusing power, is biconcave, and has an abbe number not greater than 30. The third lens element has a positive focusing power and has a convex imaging-side surface facing toward the imaging side. The fourth lens element has an imaging-side surface formed with a concave area in a vicinity of an optical axis of the fourth lens element. The imaging lens further includes an aperture stop disposed between the first and second lens elements.

Abstract: Present embodiments provide for a mobile device and an optical imaging lens thereof. The optical imaging lens comprises four lens elements positioned in an order from the object side to the image side. Through controlling the convex or concave shape of the surfaces of the lens elements, the thickness of the at least one lens element, an air gap between two lens elements, and a sum of all air gaps between all four lens elements along the optical axis satisfying the relations: (T3/G34)>4 and (Gaa/T3)>1, wherein T3 is the thickness of the third lens element, G34 is the air gap between the third lens element and the fourth lens element, and Gaa is the sum of all air gaps between all four lens elements, the optical imaging lens shows better optical characteristics and the total length of the optical imaging lens is shortened.

Abstract: An imaging lens includes plastic-made first, second, third, and fourth lens elements arranged in the given order from an object side to an imaging side. The first lens element has a positive focusing power and is biconvex. The second lens element has a negative focusing power, is biconcave, and has an abbe number not greater than 30. The third lens element has a positive focusing power and has a convex imaging-side surface facing toward the imaging side. The fourth lens element has an imaging-side surface formed with a concave area in a vicinity of an optical axis of the fourth lens element. The imaging lens further includes an aperture stop disposed between the first and second lens elements.

Abstract: An image capturing lens system includes four lens elements with refractive power, 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. The positive first lens element has a convex object-side surface at a paraxial region. The negative second lens element has a concave object-side surface at a paraxial region and an image-side surface changing from concave at a paraxial region to convex at a peripheral region, wherein the surfaces of the second lens element are aspheric. The positive third lens element has a concave object-side surface at a paraxial region and a convex image-side surface at a paraxial region. The negative fourth lens element has an image-side surface changing from concave at a paraxial region to convex at a peripheral region, and the surfaces of the fourth lens element are aspheric.

Abstract: The present invention relates to an imaging lens, the imaging lens including, in an ordered way from an object side, a first lens having a positive (+) refractive power, a second lens having a negative (?) refractive power, a third lens having a positive (+) refractive power, and a fourth lens having a negative (?) refractive power and having a negative (?) refractive power from a lens center to a lens ambience.

Abstract: An image capturing lens assembly includes, 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. The first lens element with positive refractive power has a convex object-side surface in a paraxial region thereof and a convex image-side surface in a paraxial region thereof. The second lens element with negative refractive power has a concave object-side surface in a paraxial region thereof and a convex image-side surface in a paraxial region thereof. The third lens element with positive refractive power has a concave object-side surface in a paraxial region thereof and a convex image-side surface in a paraxial region thereof. The fourth lens element with refractive power has a concave image-side surface in a paraxial region thereof. The image capturing lens assembly has a total of four lens elements with refractive power.

Abstract: An imaging lens includes a first lens L1 that has a biconvex shape near an optical axis and has positive refractive power, a second lens L2 that has a biconcave shape near the optical axis and has negative refractive power, a third lens L3 that has a shape of a meniscus lens directing a concave surface thereof to an object side near an optical axis and has positive refractive power, and a fourth lens L4 that has a biconcave shape near the optical axis and has negative refractive power, arranged in this order from the object side. When the whole lens system has a focal length f and the fourth lens L4 has a focal length f4, the imaging lens of the invention satisfies the following expression: ?0.7<f4/f<?0.1.

Abstract: An image optical lens system includes, 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. The first lens element with positive refractive power has a convex object-side surface. The second lens element has negative refractive power. The third lens element with positive refractive power is made of plastic material and has a convex image-side surface, wherein an object-side surface and the image-side surface of the third lens element are aspheric. The fourth lens element with negative refractive power is made of plastic material, and has a concave object-side surface and a concave image-side surface, wherein the object-side surface and the image-side surface of the fourth lens element are aspheric, and the image-side surface of the fourth lens element changes from concave at the paraxial region to convex at the peripheral region.

Abstract: A zoom lens includes first to third lens units having positive, negative, and positive refractive power, respectively, and a rear lens group having positive refractive power. An aperture stop is arranged between a lens surface of the second lens unit closest to the image side and a lens surface of the third lens unit closest to the image side. The third lens unit includes first and second positive lenses each including an aspheric surface, and a negative lens. In the third lens unit, a refractive index of the first positive lens, and an Abbe number and relative partial dispersion of the second positive lens are appropriately set.

Abstract: An imaging lens includes plastic-made first, second, third, and fourth lens elements arranged in the given order from an object side to an imaging side. The first lens element has a positive focusing power and is biconvex. The second lens element has a negative focusing power, is biconcave, and has an abbe number not greater than 30. The third lens element has a positive focusing power and has a convex imaging-side surface facing toward the imaging side. The fourth lens element has an imaging-side surface formed with a concave area in a vicinity of an optical axis of the fourth lens element. The imaging lens further includes an aperture stop disposed between the first and second lens elements.

Abstract: A fixed focus lens includes an M group that is disposed at a center of the optical system and has a positive refractive power; an F group that is disposed farther on the image plane side than the M group, has a negative refractive power, and is moved along the optical axis during focusing; a V group that is disposed farther on the object side than the M group, has a negative refractive index, and is moved in a direction orthogonal to the optical axis during vibration control; and an FC group that is disposed farther on the object side than the V group and has a positive refractive power. The V group is configured by a single lens element, and during focusing, at least the FC group and the M group are fixed.

Abstract: An image pickup lens having a relatively wide angle of field with various aberrations preferably corrected and having a small F-value is achieved. The image pickup lens is composed of, in order from an object side, an aperture stop, a first lens of a biconvex shape having a refractive power, a second lens of a meniscus shape having a negative refractive power with a concave surface facing the object side near the optical axis, a third lens of a meniscus shape having a positive refractive power with a concave surface facing the object side near the optical axis, and a fourth lens of a biconcave shape having a negative refractive power near the optical axis, wherein the image pickup lens satisfies a following conditional expression (1): 0.6<f1/f<0.8??(1) where f1 represents a focal length of the first lens, and f represents a focal length of the overall image pickup lens.

Abstract: This invention provides an image capturing lens system in order from an object side to an image side comprising four non-cemented lens elements with refractive power: a first lens element with positive refractive power having a convex object-side surface; a second lens element with negative refractive power having a concave image-side surface; a plastic third lens element having a concave object-side surface and a convex image-side surface, both the object-side and image-side surfaces thereof being aspheric; and a plastic fourth lens element with negative refractive power having a concave image-side surface, both the object-side and image-side surfaces thereof being aspheric, and at least one inflection point is formed on at least one of the object-side and image-side surfaces thereof; wherein the image capturing lens system comprises a stop positioned between the first lens element and the second lens element.

Abstract: An optical lens assembly for image taking includes a first lens element, a second lens element, a third lens element and a fourth lens element. The first lens element with positive refractive power includes a convex object-side surface at a paraxial region. The second lens element with negative refractive power includes a concave object-side surface at a paraxial region. The third lens element with refractive power includes a concave object-side surface at a paraxial region and a convex image-side surface at a paraxial region. The fourth lens element made of plastic with negative refractive power includes a concave object-side surface at a paraxial region and an image-side surface. At least one of the object-side surface and the image-side surface of the fourth lens element is aspheric, and the image-side surface of the fourth lens element is concave at a paraxial region and convex at a peripheral region.

Abstract: An optical system comprises, in order from an object side to an image side, a first lens group includes a first lens element with positive refractive power having a convex object-side surface; and a second lens group in order from the object side to the image side includes a second lens element with negative refractive power having a concave image-side surface, a third lens element with positive refractive power having a convex image-side surface, and a fourth lens element with negative refractive power having a concave object-side surface and a concave image-side surface, wherein the image-side surface of the fourth lens element changes from concave at a paraxial region to convex at a peripheral region, and both of the object-side surface and the image-side surface of the fourth lens element are aspheric.

Abstract: An optical module having an object side and an image side; the module comprising, from the object side to the image side: a first positive meniscus lens having a convergence C1, made of a material having a refractive index Nd1 and an Abbe number Vd1, a second negative meniscus lens having a convergence C2 made of a material having a refractive index Nd2 and an Abbe number Vd2, a third positive meniscus lens having a convergence C3, made of a material having a refractive index Nd3 and an Abbe number Vd3, a fourth negative lens having a convergence C4, made of a material having a refractive index Nd4 and an Abbe number Vd4, wherein: 1.1<C1/C<1.35 II C1/C2 II>2 0.5<C1/C3<1.1 C1/Vd1<<5.2 II C2/Vd2 II<7 IIå(Ci/Vdi)II<4 with i=1 to 4.

Abstract: An optical image capturing lens system includes, 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. The first lens element with positive refractive power has a convex object-side surface. The second lens element has negative refractive power. The third lens element has positive refractive power, wherein an object-side surface and an image-side surface of the third lens element are aspheric. The fourth lens element with refractive power is made of plastic material and has a concave image-side surface, wherein an object-side surface and the image-side surface of the fourth lens element are aspheric, and the fourth lens element has at least one inflection point formed on at least one of the object-side surface and the image-side surface thereof.

Abstract: The present invention is directed to a photographing lens containing, in order from an object side: a first lens having a positive refractive power and a convex surface facing the object side; a second lens having a negative refractive power; a third lens having a positive refractive power; and a fourth lens having a negative refractive power and at least one aspheric surface, the photographing lens satisfying the following conditional expressions: L T f ? 1.2 0.5 ? f 3 f ? 1.0 where LT denotes the distance on the optical axis between the object side of the first lens and the image side of the fourth lens; f denotes the total focal length of the photographing lens; and f3 denotes the focal length of the third lens.