Abstract: A compact low-cost imaging lens unit for a solid-state image sensor which corrects various aberrations adequately and produces a high-resolution high-definition image. The components of the unit are arranged from an object side to an image side in the following order: an aperture stop, a first lens with positive refractive power having a convex surface facing the object side, a second lens with negative refractive power having a convex surface facing the object side near an optical axis, a third lens with negative refractive power having a convex surface facing the object side near the optical axis, a fourth lens as a meniscus lens with positive refractive power having a convex surface facing the image side near the optical axis; and a fifth lens with negative refractive power having a concave surface facing the image side near the optical axis.

Abstract: This invention provides an optical imaging lens assembly comprising five lens elements with refractive power, 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 negative refractive power; a third lens element with negative refractive power; a fourth lens element with negative refractive power having at least one of the object-side and image-side surfaces thereof being aspheric; and a fifth lens element having a concave image-side surface, at least one of the object-side and image-side surfaces thereof being aspheric, and made of plastic. By such arrangement, photosensitivity and total track length of the optical imaging lens assembly can be reduced, and the aberration and astigmatism of the assembly can be effectively corrected. Moreover, high image resolution can be obtained.

Abstract: This invention provides an image capturing lens system in order from an object side to an image side comprising five 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; a third lens element with both the object-side and image-side surfaces thereof being aspheric; a plastic fourth lens element with both the object-side and image-side surfaces thereof being aspheric; and a plastic fifth lens element 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. By such arrangement, the lens system of the invention has larger chief ray angle, and thereby not only the total track length of the system can be reduced, but also better image quality can be obtained.

Abstract: The present invention is directed to provide an enhanced variable power zoom lens that is lightweight as a whole, and especially, has its focusing lens optics reduced in weight so as to relieve of a load on a focusing drive system, and that has its anti-vibration lens optics reduced in both diameter and weight so as to relieve of a load on an anti-vibration drive system and downsize the same.

Abstract: This invention provides an image capturing optical system in order from an object side to an image side comprising: a first lens element with positive refractive power having a convex object-side surface; a second lens element; a third lens element; a fourth lens element with both the object-side and image-side surfaces thereof being aspheric, and the fourth lens element is made of plastic; and a fifth lens element with negative refractive power, both the object-side and image-side surfaces thereof being aspheric, at least one inflection point is formed on at least one of the object-side and image-side surfaces thereof, and the fifth lens element is made of plastic. By such arrangement, photosensitivity and total track length of the system can be reduced, and better image quality can be obtained.

Abstract: An image pickup optical system made of five lenses, includes in order from an object side, an aperture stop, a first lens L1 having a positive refracting power, a second lens L2 having a negative refracting power, a third lens L3 having a positive refracting power, a fourth lens L4 having a positive refracting power, and a fifth lens L5 having a negative refracting power. Moreover, an image pickup apparatus includes this image pickup optical system.

Abstract: An imaging lens is provided and includes: in order from the object side, a first lens having a positive refractive power; a second lens having a negative refractive power; a third lens having a concave surface on the image side near the optical axis and having a positive refractive power; a fourth lens having a positive refractive power near the optical axis; and a fifth lens having a negative refractive power near the optical axis. An image side surface of the fifth lens is concave near the optical axis and has a region where a negative power of the region decreases toward a periphery of the fifth lens as compared with a negative power near the optical axis.

Abstract: The present invention is to provide an imaging lens and an imaging device that achieve optical performance high enough for high-pixel imaging elements, and have the smallest possible sizes and thicknesses. A first lens having positive refractive power, an aperture stop, a second lens having positive or negative refractive power, a third lens having negative refractive power, a fourth lens having positive refractive power, and a fifth lens having negative refractive power are provided in this order from the object side, and the following conditional expressions (1), (2), and (3) are satisfied: (1) 0.80<f1/f<1.40, (2) f1/|f3|<1.50, and (3) ?0.20<f1/f2<0.90, where f represents the focal length of the entire lens system, f1 represents the focal length of the first lens, f2 represents the focal length of the second lens, and f3 represents the focal length of the third lens.

Abstract: Disclosed herein is an imaging lens, including: a first lens having positive (+) power and being biconvex; a second lens having negative (?) power and being concave toward an image side; a third lens having positive (+) power and being biconvex; a fourth lens having positive (+) power and being convex toward the image side; and a fifth lens havign negative (?) power and being concave toward the image side, wherein the first lens, the second lens, the third lens, the fourth lens, and the fifth lens are sequentially disposed from an object side.

Abstract: A lens system includes a first to fifth lenses. The second and fifth lenses have negative refractive power and the others have positive refractive power. The lens system satisfies: D/TTL>1.05; Z/Y>0; G3R1/F3>G1R1/F1>0; G1R2/F1<G3R2/F3<0; and G5R1/F5<G5R2/F5<0, where D is the diameter of the optical images of the lens system, TTL is the total length of the lens system, Z is the distance between the outer periphery of an image-side surface of the fourth lens to the center of an object-side surface of the fourth lens, Y is the distance between the outer periphery of the fourth lens to the center of the fourth lens, G1R1, G2R2, G3R1, G3R2, G5R1 G5R2 are the radii of curvature of the object-side and image-side surfaces of the first, third, fifth lenses, respectively, and F1, F3, F5 are focal lengths of the first, third, fifth lenses, respectively.

Abstract: The present invention is to provide an imaging lens and an imaging device that achieve optical performance high enough for high-pixel imaging elements, and have the smallest possible sizes and thicknesses. In order from the object side, an aperture stop, a first lens having positive refractive power, a second lens having positive or negative refractive power, a third lens having negative refractive power, a fourth lens having positive refractive power, and a fifth lens having negative refractive power are provided, and the following conditional expressions (1) and (2) are satisfied: (1) 0.3<f1/|f3|<3.0, (2) ?0.3<f1/f2<4.5, where frepresents the focal length of the first lens, f2 represents the focal length of the second lens, and f3 represents the focal length of the third lens.

Abstract: An optical system includes, in order from the object side, an aperture, a first lens having a positive refractive power, a second lens having a negative refractive power, a third lens having a positive refractive power, a fourth lens having a positive refractive power and having a meniscus shape with a convex surface facing the image side, and a fifth lens having a negative refractive power. The optical system satisfies a certain condition.

Abstract: Disclosed is a low-cost, compact image pickup lens for a solid-state image pickup element. The image pickup lens includes, in the order from an object side, a first lens L1, which has a convex surface facing the object side on an optical axis and has a positive refractive power; a second lens L2, which has a concave surface facing an image side on the optical axis and has a negative refractive power; a third lens L3, which has a convex surface facing the object side on the optical axis and has a meniscus shape; a fourth lens L4, which has a convex surface facing the image side on the optical axis, has a positive refractive power, and has a meniscus shape; and a fifth lens L5, which has a concave surface facing the image side on the optical axis, has a negative refractive power, and has a meniscus shape.

Abstract: Disclosed herein is an imaging lens unit, including: a first lens having a positive (+) power; a second lens having a negative (?) power; a third lens selectively having one of a positive (+) and negative (?) power; a fourth lens having a negative (?) power; and a fifth lens having a negative (?) power, wherein the first lens, the second lens, the third lens, the fourth lens, and fifth lens are arranged in order from an object to be formed as an image, and the fourth lens is concave toward an image side.

Abstract: The image pickup optical system comprises: an aperture is placed on the most object side, the image pickup optical system comprises, in order from the 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; a fourth lens having a positive refractive power; and a fifth lens having a negative refractive power, and the following conditional expression is satisfied: ?1.49<(r6+r7)/(r6?r7)<1.24??(1) where r6 is the paraxial radius of curvature of an object side surface of the third lens, and r7 is the paraxial radius of curvature of an image plane side surface of the third lens.

Abstract: An imaging lens includes an aperture stop, a positive first lens with a biconvex shape, a negative second lens; a negative third lens, a positive fourth lens, and a negative fifth lens arranged in this order from an object side. When the whole lens system has a focal length f, focal lengths and Abbe's numbers of the first and the second lenses are f1, ?d1, f2, and ?d2, focal lengths of the fourth and fifth lenses are f4 and f5, a composite focal length of the first lens L1 and the second lens L2 is f12, and a distance from a surface of the first lens L1 on the object side to a surface of the fifth lens L5 on the image side is ?d, the imaging lens satisfies the following conditional expressions: 0.7<f12/f<1.4 0.2<|f1/f2|<0.6 15<?d1??d2 0.4<f4/f<1.0 ?d/f<1.2 |f5/f|<1.

Abstract: An optical element includes an effective diameter area that is centered on an optical axis and transmits an effective light beam, and a flange portion having, on a side surface around the effective diameter area, a slope that is not perpendicular to a direction of the optical axis.

Abstract: It has conventionally been difficult to reduce the size of a fast lens system having an F number of about 1.4 to 2.4. In a lens system of the present invention, a positive lens element is disposed closest to an object side. A diaphragm is disposed in a widest air space in the lens system. The lens system of the present invention satisfies the following conditions: 0.05<L_1/L—TH<0.21 1.5<L—TH/Y<8 where L_1 is an interval from a lens surface located closest to the object side to a lens surface located on the object side relative to the diaphragm; L_TH is an interval from the lens surface located closest to the object side to a lens surface located closest to an image side; and Y is a maximum image height.

Abstract: This invention provides an optical imaging lens assembly comprising five lens elements with refractive power, 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 negative refractive power; a third lens element with negative refractive power; a fourth lens element with negative refractive power having at least one of the object-side and image-side surfaces thereof being aspheric; and a fifth lens element having a concave image-side surface, at least one of the object-side and image-side surfaces thereof being aspheric, and made of plastic. By such arrangement, photosensitivity and total track length of the optical imaging lens assembly can be reduced, and the aberration and astigmatism of the assembly can be effectively corrected. Moreover, high image resolution can be obtained.

Abstract: The present invention provides an optical lens system comprising, 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 negative refractive power; a third lens element with positive refractive power having a convex object-side surface and a convex image-side surface; a fourth lens element; and a fifth lens element having a concave image-side surface, the object-side and image-side surfaces thereof being aspheric and at least one inflection point being formed on the image-side surface. Such arrangement of optical elements can effectively minimize the size of the optical lens system, lower the sensitivity of the optical system, and obtain higher image resolution.

Abstract: An imaging lens includes a first lens having positive refractive power; a second lens having negative refractive power; a third lens having positive refractive power; and a fourth and a fifth lens having negative refractive power. The first lens is formed so that a curvature radius of an object-side surface is positive and the second lens is formed so that a curvature radius of an object-side surface and a curvature radius of an image plane-side surface are positive. The third lens is formed so that a curvature radius of an object-side surface is positive, and the fifth lens is formed so that a curvature radius of an object-side surface and a curvature radius of an image plane-side surface are both positive. An Abbe's number from the first and the third to the fifth lens is greater than 45, and an Abbe's number of the second lens is less than 35.

Abstract: An photographing optical 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, a fourth lens element, a fifth lens element with positive refractive power and a sixth lens element with negative refractive power and a image plane. The third lens element, the fourth lens element, the fifth lens element and the sixth lens element each has an aspheric object-side surface and an aspheric image-side surface. The object-side surface of the first lens element is convex. The sixth lens element further comprises at least one inflection point and is made of plastic. By adjusting the refractive power of the first lens element and the photographing optical lens assembly, and adjusting the total length of the photographing optical lens assembly, the total volume of the lens assembly is reduced, and the image quality is improved.

Abstract: An imaging lens is provided and includes: in order from the object side, a first lens having a positive refractive power; a second lens having a negative refractive power; a third lens having a convex surface on the image side near the optical axis and having a positive refractive power; a fourth lens having a positive refractive power near the optical axis; and a fifth lens having a negative refractive power near the optical axis. An image side surface of the fifth lens is concave near the optical axis and has a region where a negative power of the region decreases toward a periphery of the fifth lens as compared with a negative power near the optical axis.

Abstract: A lens module includes a barrel, a first lens, a second lens, a third lens, and two spacers. The first lens, the second lens, and the third lens are received in the barrel from an object side to an image side of the lens module. Each lens includes an optical portion and a non-optical portion around the optical portion. The two spacers are respectively positioned on the non-optical portions of two adjacent lenses. The non-optical portion of the second lens includes a first contact portion and two second contact portions. The first contact portion contacts an inner sidewall of the barrel. The second contact portions respectively contact the first lens and the third lens and are arranged in an acute angle with respect to an optical axis of the lens module. The non-optical portion of the second lens excluding the first contact portion and the second contact portions is nebulized.

Abstract: An photographing optical lens assembly includes, in order from an object side to an image side, a first lens element with positive refractive power, a second lens element with negative refractive power having a concave object-side surface and a concave image-side surface, a plastic third lens element with positive refractive power having a concave aspheric object-side surface and a convex aspheric image-side surface, a plastic fourth lens element with negative refractive power having a concave aspheric object-side surface and a convex aspheric image-side surface and a plastic fifth lens element having an aspheric object-side surface and an aspheric image-side surface. By adjusting the focal lengths of the second and the fourth lens element and the photographing optical lens assembly, and the curvature radii of the object-side and the image-side surface of the second lens element, the photographing optical lens assembly is miniaturized, and the image quality is improved.

Abstract: An optical imaging lens assembly comprising five non-cemented lens elements with refractive power, sequentially arranged from an object side to an image side, comprising: the first lens element with positive refractive power, the second lens element with negative refractive power, the third lens element with refractive power having a concave object-side surface and at least one aspheric surface, the fourth lens element with positive refractive power having two aspheric surfaces, and the fifth lens element with negative refractive power having a concave object-side surface and a convex image-side surface with both being aspheric. Wherein an image sensor disposed on an image plane and a stop are also provided. By such arrangements, the image pickup optical system satisfies conditions related to shorten the total length and to reduce the sensitivity for use in compact cameras and mobile phones with camera functionalities.

Abstract: This invention provides an image capturing optical lens system in order from an object side to an image side comprising: a first lens element with positive refractive power having a convex object-side surface; a second lens element with negative refractive power; a third lens element with negative refractive power having at least one of the object-side and image-side surfaces thereof being aspheric; a fourth lens element having at least one of the object-side and image-side surfaces thereof being aspheric; a fifth lens element having a concave image-side surface, both the object-side and image-side surfaces thereof being aspheric, at least one inflection point is formed on at least one of the object-side surface and the image-side surface thereof, and the fifth lens element is made of plastic. By such arrangement, photosensitivity and total track length of the system can be reduced, and the aberration and astigmatism of the system can be effectively corrected. Moreover, high image resolution can be obtained.

Abstract: This invention provides an imaging lens assembly including five lens elements with refractive power, in order from an object side toward an image side: a first lens with positive refractive power having a convex object-side surface, a second lens with negative refractive power, a third lens having a concave object-side surface, a fourth lens with positive refractive power having an object-side surface and a convex image-side surface, and at least one of both surfaces thereof being aspheric, a fifth lens with negative refractive power having a concave image-side surface with at least one inflection point formed thereon. An aperture stop is positioned between an imaged object and the second lens. The imaging lens assembly further comprises an electronic sensor on which an object is imaged. With such arrangement, the size and the optical sensitivity of the lens assembly can be reduced. A high image resolution is also obtained.

Abstract: Provided is an imaging lens and a camera module, the device including in an orderly way from an object side, a first lens with positive (+) refractive power; a second lens with negative (?) refractive power; a third lens with negative (?) refractive power; a fourth lens with negative (?) refractive power; and a fifth lens with negative (?) refractive power, wherein the lens is concavely formed at an object side surface.

Abstract: An image pickup optical system having five lenses includes in order from an object side, a first lens having a biconvex shape, and a positive refractive power, a second lens having a negative refractive power, a third lens having a meniscus shape with a concave surface thereof directed toward the object side, and a negative refractive power, a fourth lens having a meniscus shape with a concave surface thereof directed toward the object side, and a positive refractive power, and a fifth lens having a negative refractive power. The third lens and the fourth lens are cemented, and the negative refractive power at a central portion of the third lens increases gradually toward a peripheral portion thereof, and the positive refractive power at a central portion of the fourth lens decreases gradually toward a peripheral portion thereof.

Abstract: An imaging lens includes a positive first lens; a negative second lens with a meniscus lens shape directing a convex surface thereof to an object side near an optical axis; a positive third lens; a negative fourth lens with a meniscus lens shape directing a concave surface thereof to the object side near the optical axis; a negative fifth lens with a meniscus lens shape directing a convex surface thereof to the object side near the optical axis, arranged in this order from the object side.

Abstract: This invention provides an optical lens system comprising: a first lens element with positive refractive power; a second lens element with negative refractive power; a third lens element with negative refractive power having a concave object-side surface and at least one of the object-side surface and the image-side surface thereof being aspheric; a plastic fourth lens element having at least one of the object-side surface and the image-side surface thereof being aspheric; a plastic fifth lens element having a concave image-side surface, at least one of the object-side surface and the image-side surface thereof being aspheric, and at least one inflection point is formed on at least one of the object-side surface and the image-side surface thereof. By such arrangement, photosensitivity and total track length of the system can be reduced, and the aberration and astigmatism of the system can be effectively corrected. Moreover, high image resolution can be obtained.

Abstract: Provided is an imaging lens and a camera module, the device including in an orderly way from an object side, a first lens with positive (+) refractive power; a second lens with negative (-) refractive power; a third lens with negative (?) refractive power; a fourth lens with negative (-) refractive power; and a fifth lens with negative (?) refractive power, wherein the lens is concavely formed at an object side surface.

Abstract: An imaging lens is provided and includes: in order from the object side, a first lens having a positive refractive power; a second lens having a negative refractive power; a third lens having a concave surface on the image side near the optical axis and having a positive refractive power; a fourth lens having a positive refractive power near the optical axis; and a fifth lens having a negative refractive power near the optical axis. An image side surface of the fifth lens is concave near the optical axis and has a region where a negative power of the region decreases toward a periphery of the fifth lens as compared with a negative power near the optical axis.

Abstract: The present invention provides a five-piece imaging lens module including a fixed diaphragm and an optical module. The optical module includes five lenses arranged from an object side to an image side in a sequence of: the first lens, having a positive refractive power, a concave surface, and having at least one aspheric surface; the diaphragm; the second lens, having a negative refractive power, a concave surface, and having at least one aspheric surface; the third lens, having a positive refractive power, a convex surface, and having at least one aspheric surface; the fourth lens, having a concave surface, and having at least one aspheric surface; the fifth lens, having a convex on the object side near to the optic axis, and having at least one aspheric surface. With the fifth lens, the present invention provides a better resolving power.

Abstract: A photographing optical lens assembly includes, in order from an object side to an image side: a first lens element with positive refractive power, a second lens element with negative refractive power having a convex object-side surface and a concave image-side surface, a third lens element having a concave image-side surface, wherein at least one of the object-side surface and the image-side surface of the third lens element is aspheric, a fourth lens element with positive refractive power having a convex image-side surface, wherein at least one of the object-side surface and the image-side surface of the fourth lens element is aspheric, and a fifth lens element with negative refractive power having a concave image-side surface, wherein at least one of the object-side surface and the image-side surface of the fifth lens element is aspheric.

Abstract: An image pickup optical system made of five lenses, includes in order from an object side, an aperture stop, a first lens L1 having a positive refracting power, a second lens L2 having a negative refracting power, a third lens L3 having a positive refracting power, a fourth lens L4 having a positive refracting power, and a fifth lens L5 having a negative refracting power. Moreover, an image pickup apparatus includes this image pickup optical system.

Abstract: This invention provides an optical imaging lens system including five lens elements with refractive power, in order from an object side toward an image side: a first lens element with positive refractive power having a convex object-side surface, a second lens element with negative refractive power, a third lens element having a convex object-side surface and a concave image-side surface, a fourth lens element having both surfaces being aspheric, a fifth lens element having a concave image-side surface with at least one inflection point formed thereon. By such arrangement, the total track length and the sensitivity of the optical imaging lens system can be reduced while achieving high image resolution.

Abstract: This invention provides an image capturing lens assembly in order from an object side to an image side comprising: a first lens element with positive refractive power having a convex object-side surface; a second lens element with negative refractive power; a third lens element with negative refractive power having a concave object-side surface; a fourth lens element having a concave object-side surface and a convex image-side surface; and a fifth lens element having a concave image-side surface, the object-side and image-side surfaces thereof being aspheric and at least one inflection point being formed on at least one of the object-side and image-side surfaces thereof. By such arrangement, it can effectively reduce the aberration as well as the total track length of the imaging lens system for obtaining higher image resolution.

Abstract: An imaging lens includes, sequentially from an object side, a positive first lens; a negative second lens; a positive third lens having a convex surface on an image plane side; a fourth lens that is a meniscus lens having a convex surface on the image plane side; and a fifth lens having a refractive power that gradually changes from negative at the lens center to positive at the lens periphery, where the first lens and the second lens are disposed having an interval therebetween.

Abstract: An imaging optical system smaller than conventional systems yet with well-corrected aberrations, comprises five lenses L1-L5 having refractive powers, in order from the object side: positive, negative, positive, positive, and, with an aperture at an endmost object-side position. In one embodiment, L1 is biconvex, L2's object-side surface is convex, L5's object-side surface is convex, and 1.0<f3/f1<4.9, f1 and f3 being the focal lengths of L1 and L3, respectively. In a variant thereof, L2 is a meniscus lens and L5's object-side surface is concave. In another embodiment, L1 is glass, and ?4.0<(r6+r7)/(r6?r7)<?0.51, r6 and r7 being paraxial curvature radii of L3's object- and image-side surfaces, respectively. In another embodiment, L1 is glass, and 1.5<f2/f<0.73, f2 being the focal length of L2 and f the focal length of the whole optical system. In yet another embodiment, L1 is glass, and 11.2<r3/f1<0.9, r3 being the paraxial curvature radius of L1's image-side surface.

Abstract: An image pickup optical system made of five lenses, includes in order from an object side, an aperture stop, a first lens L1 having a positive refracting power, a second lens L2 having a negative refracting power, a third lens L3 having a positive refracting power, a fourth lens L4 having a positive refracting power, and a fifth lens L5 having a negative refracting power. Moreover, an image pickup apparatus includes this image pickup optical system.

Abstract: A compact low-cost imaging lens unit for a solid-state image sensor which corrects various aberrations adequately and produces a high-resolution high-definition image. The components of the unit are arranged from an object side to an image side in the following order: an aperture stop, a first lens with positive refractive power having a convex surface facing the object side, a second lens with negative refractive power having a convex surface facing the object side near an optical axis, a third lens with negative refractive power having a convex surface facing the object side near the optical axis, a fourth lens as a meniscus lens with positive refractive power having a convex surface facing the image side near the optical axis; and a fifth lens with negative refractive power having a concave surface facing the image side near the optical axis.

Abstract: This invention provides an imaging lens system including, in order from an object side to an image side: a first lens with positive refractive power having a convex object-side surface; a second lens with negative refractive power; a third lens having a concave image-side surface; a fourth lens with positive refractive power; a fifth lens with negative refractive power having a concave image-side surface, at least one surface thereof having at least one inflection point; and an aperture stop disposed between an imaged object and the third lens. The on-axis spacing between the first lens and second lens is T12, the focal length of the imaging lens system is f, and they satisfy the relation: 0.5<(T12/f)×100<15.

Abstract: An image pickup optical lens assembly, sequentially arranged from an object side to an image side along an optical axis, comprising: the first lens element with positive refractive power having a convex object-side surface, the second lens element with negative refractive power, the third lens element with refractive power, the fourth lens element with positive or negative refractive power having a concave object-side surface and a convex image-side surface with both being aspheric, and the fifth lens element with positive or negative refractive power having a convex object-side surface and a concave image-side surface with both being aspheric. Additionally, the image pickup optical lens assembly satisfies conditions related to the reduction of the total length and the sensitivity of the image pickup optical lens assembly for compact cameras and mobile phones with camera functionalities.

Abstract: An image pickup optical lens assembly, sequentially arranged from an object side to an image side along an optical axis, comprises the first lens element with positive refractive power having a convex object-side surface, the second lens element with negative refractive power having a concave object-side surface and a convex image-side surface, the third lens element with refractive power, the fourth lens element with positive refractive power having a concave object-side surface and a convex image-side surface, the fifth lens element with negative refractive power having a concave image-side surface with at least one inflection point, and a stop. Each of the five lens elements may be made of plastic with bi-aspherical surfaces. Additionally, the image pickup optical lens assembly satisfies conditions of shortening the total length and reducing the sensitivity for usage in compact cameras and mobile phones with camera functionalities.

Abstract: An optical system comprises, in order from the object side, a first lens having a biconvex shape and having a positive refractive power, a second lens having a meniscus shape with a concave surface facing the object side and having a negative refractive power, a third lens having a negative refractive power, a fourth lens having a meniscus shape with a concave surface facing the object side and having a positive refractive power, and a fifth lens having a negative refractive power. The first lens and the second lens are cemented together.

Abstract: A zoom lens comprises, in order from an object side to an image side, a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, a third lens unit, and a fourth lens unit having a positive refractive power. The fourth lens unit includes a forty-first lens unit having a negative refractive power and arranged at the object side with reference to the longest air gap and a forty-second lens unit having a positive refractive power and arranged at the image side with reference to the air gap. The forty-first lens unit includes a negative 411st lens, and the forty-second lens unit includes a positive 421st lens. Abbe numbers and partial dispersion ratios of materials of the 411st lens and the 421st lens ?d411, ?gF411, ?d421 and ?gF421 are appropriately set.

Abstract: The image pickup optical system comprises: an aperture is placed on the most object side, the image pickup optical system comprises, in order from the 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; a fourth lens having a positive refractive power; and a fifth lens having a negative refractive power, and the following conditional expression is satisfied: ?1.49<(r6+r7)/(r6?r7)<1.24 ??(1) where r6 is the paraxial radius of curvature of an object side surface of the third lens, and r7 is the paraxial radius of curvature of an image plane side surface of the third lens.

Abstract: Disclosed is a low-cost, compact image pickup lens for a solid-state image pickup element. The image pickup lens includes, in the order from an object side, a first lens L1, which has a convex surface facing the object side on an optical axis and has a positive refractive power; a second lens L2, which has a concave surface facing an image side on the optical axis and has a negative refractive power; a third lens L3, which has a convex surface facing the object side on the optical axis and has a meniscus shape; a fourth lens L4, which has a convex surface facing the image side on the optical axis, has a positive refractive power, and has a meniscus shape; and a fifth lens L5, which has a concave surface facing the image side on the optical axis, has a negative refractive power, and has a meniscus shape.