Abstract: The objective optical system consists of order from an object side, a first group having a positive refractive power, a second group having a negative refractive power, and a third group having a positive refractive power, wherein focusing is carried out by moving the second group, and a lens nearest to image is a planoconvex positive lens having a convex surface directed toward the object side, and a flat surface of the planoconvex positive lens is either affixed directly to an image pickup surface or cemented to a cover glass formed on the image pickup surface, and the objective optical system satisfies the following conditional expression (1). 5<ff/f<8??(1) where, ff denotes a focal length of the planoconvex positive lens disposed nearest to image, and f denotes a focal length of the overall objective optical system at the time of normal observation.

Abstract: A four-surface, near-infrared wafer-level lens system for imaging a scene onto an image plane includes (a) a first wafer-level lens having a first convex lens surface facing the scene and a second concave lens surface facing the image plane, and (b) a second wafer-level lens disposed between the first wafer-level lens and the image plane and including a third concave lens surface facing the scene and a fourth aspheric convex lens surface facing the image plane. The four-surface, near-infrared wafer-level lens system is further characterized by an image resolution corresponding to at least 60% contrast of 2 line pairs per millimeter in object plane across a scene portion having at least 10 millimeters extent in the object plane.

Abstract: The present disclosure discloses a camera optical lens, including, in an order from an object side to an image side, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. The first lens is made of plastic material, the second lens is made of plastic material, the third lens is made of plastic material, the fourth lens is made of glass material, the fifth lens is made of glass material, and the sixth lens is made of plastic material. The camera optical lens further satisfies specific conditions.

Abstract: The present disclosure discloses a camera optical lens. The camera optical lens including, in an order from an object side to an image side, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens. The camera optical lens further satisfies specific conditions.

Abstract: An optical apparatus which has a lens movable forward or backward in a direction of an optical axis through operation of an operating member, prevents unintended motions in the lens, and improves operating quality of the operating member at low cost. A fixing member rotatably holds the operating member and has a first contact surface coming into contact with a pressing member sandwiched between the operating member and the fixing member. The operating member rotatable about the optical axis moves an image pickup optical system in the direction of the optical axis and has a second contact surface facing the first contact surface and coming into contact with the pressing member. The pressing member applies pressing force as load on the operating member to the operating member. The first or second contact surface has a slope that changes the pressing force according to a rotational angle of the operating member.

Abstract: A compact telephoto lens system that may be used in a small form factor cameras. The lens system may include five lens elements with refractive power. Alternatively, the lens system may include four lens elements with refractive power. At least one of the object side and image side surfaces of at least one of the lens elements is aspheric. Total track length (TTL) of the lens system may be 6.0 mm or less. Focal length f of the lens system may be at or about 7.0 mm (for example, within a range of 6.5-7.5 mm). Lens elements are selected and configured so that the telephoto ratio (TTL/f) satisfies the relation 0.74<TTL/f<1.0. Materials, radii of curvature, shapes, sizes, spacing, and aspheric coefficients of the lens elements may be selected to achieve quality optical performance and high image resolution in a small form factor telephoto camera.

Abstract: There is provided a lens element which is capable of obtaining a small-sized image capturing device with excellent resolving power, and an image capturing device including the lens element. A shape of an outer profile of an image side surface (L2) is substantially rectangular.

Abstract: A light blocking sheet having a central axis includes a central hole and a plurality of inner extended portions. The central axis passes through the central hole, which is enclosed by a hole inner surface. The hole inner surface has a first corresponding circle and a second corresponding circle, wherein a diameter of the first corresponding circle is greater than a diameter of the second corresponding circle. The inner extended portions are adjacent to and surround the central hole, wherein each of the inner extended portions is extended and tapered from the first corresponding circle towards the second corresponding circle and includes an inner surface, and the inner surface includes a line pair. The line pair includes two line sections, wherein one end of one line section thereof and one end of the other line section thereof are towards the second corresponding circle and approach to each other.

Abstract: An imaging lens is constituted by, in order from the object side to the image side: a first lens group; a stop; and a second lens group having a positive refractive power. The first lens group is constituted by, in order from the object side to the image side: one or two negative meniscus lenses, a biconcave lens, and a biconvex lens. The second lens group is constituted by, in order from the object side to the image side: a 2A lens group having a positive refractive power as a whole, constituted by a positive lens, a negative lens, and a positive lens; and a 2B lens group having a positive refractive power as a whole, constituted by a positive lens, a negative lens, and a positive lens. A predetermined conditional formula is satisfied.

Abstract: An imaging 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, a fourth lens element, a fifth lens element and a sixth lens element. The first lens element has negative refractive power. The fourth lens element with positive refractive power has an object-side surface and an image-side surface being both aspheric. The fifth lens element with negative refractive power has an object-side surface being concave in a paraxial region thereof and an image-side surface being convex in a paraxial region thereof, wherein two surfaces of the fifth lens element are aspheric. The sixth lens element has an image-side surface being concave in a paraxial region thereof and comprising at least one convex shape in an off-axial region thereof, wherein two surfaces of the sixth lens element are aspheric.

Abstract: An endoscope magnification optical system includes, in order starting from an object side, a first lens group having positive power, a second lens group having positive power, and a third lens group including at least a meniscus lens with a concave surface facing the object side and a positive lens, and the endoscope magnification optical system is configured to magnify an optical image by moving at least the second lens group in an optical axis direction with respect to the first lens group, which is a fixed lens group, while a distance from a lens surface located the closest to the object of the first lens group to an image plane is kept constant.

Abstract: A photographic objective lens includes seven lenses, wherein a first lens is a meniscus lens, a second lens is a meniscus lens, a third lens is a meniscus lens, a fourth lens is a biconcave lens, a fifth lens is a biconvex lens, a sixth lens is a biconvex lens, a seventh lens is a meniscus lens. The first lens has a first curved surface and a second curved surface, the second lens has a third curved surface and a fourth curved surface, the third lens has a fifth curved surface and a sixth curved surface, the fourth lens has a seventh curved surface and a eighth curved surface, the fifth lens has a ninth curved surface and a tenth curved surface, the sixth lens has a eleventh curved surface and a twelfth curved surface, and the seventh lens has a thirteenth curved surface and a fourteenth curved surface; wherein the first curved surface to the fourteenth curved surface are sequentially arranged along a transmission direction of incident light.

Abstract: Present embodiments provide for an optical imaging lens. The optical imaging lens may comprise four lens elements positioned sequentially from an object side to an image side. Through controlling the convex or concave shape of the surfaces of the lens elements and designing parameters satisfying at least one inequality, the optical imaging lens may exhibit better optical characteristics and the total length of the optical imaging lens may be shortened.

Abstract: An annular optical spacer includes a first side portion, a second side portion, an outer annular portion, an inner annular portion and an anti-reflective layer. The second side portion is opposite to the first side portion. The outer annular portion connects the first side portion with the second side portion. The inner annular portion connects the first side portion with the second side portion. A vertical distance between the inner annular portion and a central axis of the annular optical spacer is shorter than a vertical distance between the outer annular portion and the central axis of the annular optical spacer. The inner annular portion includes at least one rugged surface. The rugged surface includes a plurality of annular protruding structures, and the annular protruding structures are coaxially arranged around the central axis. The anti-reflective layer is on top of the rugged surface.

Abstract: A two-surface narrow field-of-view (FOV) compound lens for producing an image of an object at an image plane of an imaging system includes a biplanar substrate between a plano-convex lens and a plano-concave lens having a common optical axis. The plano-convex lens has a first planar surface on a first side of the biplanar substrate and is formed of a material having a first Abbe number. The plano-concave lens has a second planar surface on a second side of the biplanar substrate opposite the first side, and is formed of a material having a second Abbe number less than the first Abbe number. The first and second lens have respective focal lengths F1 and F2 that may satisfy ?1.4<F2/F1 <?0.9. The compound lens may have a total track length T and an effective focal length feff such that their ratio satisfies 0.88<T/feff<0.98.

Abstract: An imaging lens is substantially constituted by: a negative first lens group; a positive second lens group; an aperture stop; a positive third lens group; and a negative fourth lens group; provided in this order from an object side. The first lens group is constituted only by two or more negative lenses. The second lens group has a positive lens at the most object side thereof. The third lens group has a negative lens having a concave surface toward the object side at the most object side thereof. The fourth lens group is constituted by a single negative lens. The fourth lens group moves from the object side to an image side when changing focus from an object at infinity to an object at an extremely close distance. Only the fourth lens group moves during focusing operations.

Abstract: An imaging lens is constituted essentially by, in order from the object side to the image side, a negative first lens group, a positive second lens group, a stop, and a positive third lens group. The first lens group is constituted essentially by four or fewer lenses, has a positive lens and a negative meniscus lens provided adjacent to each other in this order from the most object side, and further has a negative lens at the most image side. The second lens group is constituted essentially by one single lens. The third lens group is constituted essentially by five or fewer lenses, and has four lenses having refractive powers of different signs adjacent to each other provided in order as lenses most toward the image side. Predetermined conditional formulae are satisfied.

Abstract: An objective lens for endoscopes includes, in order from the object side: a front group; an aperture stop; and a positive rear group. The front group includes, in order from the object side, a negative first lens, in which the absolute value of the radius of curvature of the surface toward the image side is less than that of the surface toward the object side, and at least one plane parallel plate. The rear group includes, in order from the object side, a positive second lens, and a cemented lens formed by a positive third lens and a negative fourth lens. The coupling surface of the cemented lens is convex toward the image side. Conditional Formulae (1) through (3) concerning the plane parallel plates within the front group, the focal length of the first lens, the radius of curvature of the coupling surface of the cemented lens, etc., are satisfied.

Abstract: There is provided an optical system including: a first lens having negative refractive power and having a meniscus shape of which an object-side surface is convex; a second lens having positive refractive power; a third lens having refractive power; and a fourth lens having positive refractive power and having a meniscus shape of which an object-side surface is convex, wherein the first to fourth lenses are sequentially disposed from an object side, whereby an aberration improvement effect, a wide field of view and a high degree of resolution may be realized.

Abstract: A photographing lens group and an electronic apparatus including the same are provided. The photographing lens group includes a first lens having a positive refractive power, a second lens having a negative refractive power, a third lens having a positive or negative refractive power, a fourth lens having a positive or negative refractive power, a fifth lens having a negative refractive power, and a sixth lens having a positive refractive power. The first, second, third, fourth, fifth, and sixth lenses are sequentially arranged from an object side to an image side of the photographing lens group. The photographing lens group satisfies an inequality of 1.0<CT6/CT5<3.5 where CT5 is a thickness of the fifth lens with respect to an optical axis and CT6 is a thickness of the sixth lens with respect to the optical axis.

Abstract: A 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 and a sixth lens element. The first lens element with negative refractive power has an image-side surface being concave in a paraxial region thereof. The fourth lens element has an image-side surface being concave in a paraxial region thereof. The sixth lens element with negative refractive power has an object-side surface being concave in a paraxial region thereof and an image-side surface being concave in a paraxial region thereof, wherein the image-side surface of the sixth lens element has at least one convex shape in an off-axis region thereof, and both two surfaces thereof are aspheric. The first through sixth lens element are all single and non-cemented lens elements.

Abstract: There is provided a first lens having a refractive power, an object-side surface thereof being convex toward an object; a second lens having positive refractive power; a third lens having negative refractive power; a fourth lens having positive refractive power; and a fifth lens having negative refractive power. The optical system satisfies the condition: T34/T23>8.0 where T23 is a distance between the second and third lenses, and T34 is a distance between the third and fourth lenses.

Abstract: A system for displaying an anamorphic image on a viewing surface comprises a screen having a viewing surface and an image source configured to display the anamorphic image on the viewing surface such that an image viewed on the viewing surface appears undistorted from a viewing point. In addition, the system may also include a reflective lens having a convex exterior surface and a refractive lens having a plurality of surfaces to redirect light toward an image capture device. Further, the system may include an image conversion module for converting a non-anamorphic image into the anamorphic image suitable for displaying on the viewing surface and a selected portion of the anamorphic image into at least one non-anamorphic image.

Abstract: An imaging lens includes: a first lens group having a positive refractive power which is fixed during focusing operations; a second lens group having a positive refractive power which moves during focusing operations; and a third lens group which is fixed during focusing operations. The first lens group includes a 1a lens group having a positive refractive power, an aperture stop, and a 1b lens group having a positive refractive power. The 1a lens group includes a positive lens, a negative meniscus lens, a negative meniscus lens, a positive meniscus lens, a negative lens, a positive lens, a negative lens, and a cemented lens formed by a positive lens and a negative lens.

Abstract: A photographic lens optical system. The photographic lens optical system includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens that are sequentially arranged in a direction from an object toward an image sensor. The first lens has a negative (?) power, and the emission surface thereof may be convex toward the object. The second lens may have a positive (+) power, the third and fourth lenses have positive (+) powers, and the fifth lens has a negative (?) power. Furthermore, the sixth lens is an aspherical lens having a positive (+) power.

Abstract: A photographing 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, a fourth lens element and a fifth lens element. The first lens element with negative refractive power has a concave image-side surface. The second lens element has refractive power. The third lens element with positive refractive power has a convex object-side surface and a convex image-side surface. The fourth lens element with negative refractive power has a concave image-side surface, wherein an object-side surface and the image-side surface of the fourth lens element are aspheric. The fifth lens element with positive refractive power has a convex object-side surface and a convex image-side surface, wherein the object-side surface and the image-side surface of the fifth lens element are aspheric.

Abstract: A camera apparatus includes: a camera main body having a single plate type imaging section; and a handle mounting section for mounting a handle on an upper portion of the camera main body, wherein a lens for a three-plate type imaging section can be mounted on a lens mount section of a front portion of the camera main body via a mount adapter, and the handle mounting section mounts the handle on the upper portion of the camera main body so as to be able to move in a front-back direction.

Abstract: An imaging lens, includes: in order from an object side to an image side, a first negative lens group including a negative lens a concave surface of which faces the image side; a second positive lens group including a negative lens a concave surface of which faces the object side, and a positive lens, or a cemented lens entirely having a positive refractive power in order from the object side to the image side; an aperture; a third positive lens group including a cemented lens of a biconvex lens and a biconcave lens from the object side; and a fourth lens group having a weakest refractive power among all of the lens groups and including a single lens, or a cemented lens, a surface on the object side of which is concave and a surface on the image side of which is convex.

Abstract: An image 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 and a sixth lens element. The first lens element with positive refractive power has a convex object-side surface. The second lens element has positive refractive power. The third lens element has refractive power. The fourth lens element has refractive power. The fifth lens element with negative refractive power has a concave object-side surface, wherein both of the surfaces of the fifth lens element are aspheric. The sixth lens element with refractive power has a concave image-side surface, wherein the image-side surface thereof has at least one inflection point, and both of the surfaces of the sixth lens element are aspheric. The image lens assembly has a total of six lens elements with refractive power.

Abstract: An imaging lens provided with a negative first lens group and a positive second lens group disposed in order from the object side. The first lens group is composed of a first group first lens which is a negative biconcave single lens, and the second lens group is composed of a positive second group first lens, an aperture stop, a positive second group second lens, and a negative second group third lens disposed in order from the object side. The second group second lens and second group third lens are cemented together to form a cemented lens. The imaging lens is configured to satisfy a conditional expression (3) 0.9<dt3/f<1.3, and further configured to satisfy conditional expression (1) 31<?d2<55 or (1?): 35<?d2 and a conditional expression (2): ?10<?d1??d2<25.

Abstract: An imaging lens substantially consists of six lenses of a negative first lens, a negative second lens, a positive third lens, a positive fourth lens, a negative fifth lens and a positive sixth lens in this order from an object side. When a curvature radius of an object-side surface of the fourth lens is R8, and a curvature radius of an image-side surface of the fourth lens is R9, and an Abbe number of the material of the third lens for d-line is ?d3, and an Abbe number of the material of the fifth lens for d-line is ?d5, the following conditional formulas (1) and (6) are satisfied: ?0.61<(R8+R9)/(R8?R9)<0.44??(1); and 38.1<?d3+?d5<45.1??(6).

Abstract: An optical imaging lens set includes: a first lens element with positive refractive power, a second lens element having an image-side surface with a concave portion in a vicinity of its periphery, a third lens element with positive refractive power, having a convex image-side surface, an object-side surface with a concave portion in a vicinity of its periphery, a fourth lens element having a concave object-side surface, and a plastic fifth lens element having an image-side surface with a concave portion in a vicinity of the optical axis. The total thickness Ta1 of the all lens elements along the optical axis, all four air gaps Gaa between each lens element along the optical axis, the thickness T3 of the third lens element along the optical axis and the thickness T5 of the fifth lens element along the optical axis satisfy the relation (Ta1+Gaa)/(T3+T5)?4.00.

Abstract: Provided is a zoom lens, including, in order from an object: a first lens group (G1) having positive refractive power; a second lens group (G2) having negative refractive power; a third lens group (G3) having positive refractive power; and a fourth lens group (G4) having positive refractive power. The first lens group (G1 includes only, in order from the object, a cemented lens of a negative lens (L11) and a positive lens (L12), and a positive meniscus lens (L13) having a convex surface facing the object, an aperture stop (S) for determining brightness is disposed to the object side of the third lens group (G3), and upon zooming, all of the four groups (G1 to G4) move and the aperture stop (S) moves together with the third lens group (G3), and the conditional expression ?dp1>85.0 is satisfied, where ?dp1 denotes an Abbe number of the positive lens (L12), which is disposed closest to the object in the first lens group (G1), at the d-line as a standard.

Abstract: A lens module includes a first lens and a first spacer. The first lens includes a first optical portion and a first support portion surrounding the first optical portion. The first support portion includes a first upper surface facing an object side of the lens module and a first lower surface facing an image side of the lens module. The first lower surface includes a first annular portion, a slanted annular portion and an inner annular portion. The slanted annular portion is obliquely interconnected between the outer annular portion and the inner annular portion. The first annular portion and the inner annular portion are perpendicular to the optical axis of the lens module. The slanted annular portion faces inwardly of the first lens. The outer shield portion covers the first annular portion. The intermediate shield portion covers the slanted annular portion. The inner shield portion covers the inner annular portion.

Abstract: An optical imaging lens set includes: a first lens element with positive refractive power having an image-side surface with a convex part in a vicinity of a circular periphery of the first lens element, a second lens element having an object-side surface with a convex part in a vicinity of a circular periphery of the second lens element, a third lens element having an object-side surface with a concave part in a vicinity of a circular periphery of the third lens element, a fourth lens element having a concave object-side surface, and a plastic fifth lens element having an image-side surface with a concave part in a vicinity of the optical axis. The air gap between the second lens element and the third lens element G23, and the air gap between the third lens element and the fourth lens element G34, satisfied the relation 1.40?G23/G34.

Abstract: An optical imaging lens set includes a first lens element to a plastic fifth lens element from an object side toward an image side along an optical axis. Each first lens and second lens element has positive refractive power. The third lens element has an image-side surface with a convex portion in a vicinity of the optical axis. The fourth lens element has an image-side surface with a convex portion in a vicinity of the optical axis. The fifth lens element has an image-side surface with a concave portion in a vicinity of the optical axis and a convex portion in a vicinity of its periphery.

Abstract: Projection lens having improved properties such as a high throughput are described. In one embodiment, a projection lens is described comprising in sequential order from a screen side a first lens group, a second lens group of positive refractive power, and a third lens group of positive refractive power. At least one lens group has an aspheric surface. The ratio of the focal length of the projection lens (F) to the focal length of each of the lens groups (F1, F2, and F3) is such that |F1/F|>5, 0.5<|F2/F|<0.9, and 1<F3/F<8. In another embodiment, a projection lens is described comprising in sequential order from a screen side a first lens group, a second lens group of positive refractive power, and a third lens group of positive refractive power. At least one lens group has an aspheric surface. The ratio of the focal length of the projection lens (F) to the focal length of each of the lens groups (F1, F2, and F3) is such that |F1/F|>5, 0.5<|F2/F|<2.0, and 1.4<F3/F<8.

Abstract: A camera system includes an image sensor, a stop aperture, an infrared cut filter disposed between the image sensor and the stop aperture, and a lens assembly. The lens assembly has a field of view ranging between 80 degrees and 110 degrees and is disposed between the infrared cut filter on an image side of the lens assembly and the stop aperture on an object side of the lens assembly. The lens assembly includes six lenses. Four of the six lenses have positive optical power and two of the six lenses have negative optical power. The six lenses include first, second, third, fourth, fifth, and sixth lenses having first inline, second inline, third inline, fourth inline, fifth inline, and sixth inline relative positions, respectively, along an optical path through the lens assembly.

Abstract: An imaging lens includes a lens barrel, an imaging unit and a light shielding unit. The lens barrel includes a base wall formed with a light incident hole at an optical axis of the imaging lens and a surrounding wall that extends from and cooperates with the base wall to define a receiving space. The imaging unit includes a plurality of imaging components each having an annular front contact surface and an annular back contact surface. The light shielding unit includes an annular retaining portion clamped between an adjacent pair of the imaging components, an object-side protruding portion with a first edge, and an image-side protruding portion with a second edge.

Abstract: The purpose of the present invention is to provide a lens unit which can create an effective light shield despite the simple process by which the lens unit is produced. A non-transmissive filler (BD) is filled and solidified in the gap between the outer periphery of a light shielding member (SH1) and the outer peripheries of a first lens (L1) and a second lens (L2).

Abstract: An imaging lens substantially includes five lenses, constituted by: 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 convex surface that faces an object side; a fourth lens having a negative refractive power and a meniscus shape with a concave surface that faces the object side; and a fifth lens having a positive refractive power, a meniscus shape with a convex surface that faces the object side, and at least one inflection point on the surface thereof toward an image side.

Abstract: An optical lens includes a first lens group and a second lens group. The first lens group is disposed between a magnified side and a minified side and has a negative refractive power. The second lens group is disposed between the first lens group and the minified side and has a positive refractive power. The optical lens is capable of forming an image at the magnified side. F/H>0.52, where F is an effective focal length, and H is an image height. A viewing angle is greater than 116.7 degrees.

Abstract: An imaging lens substantially consists of five lenses consisting of, in order from the object side: a first lens having a positive refractive power with a convex surface toward the object side; a second lens having a negative refractive power and having a meniscus shape with a convex surface toward the image side; a third lens having a positive refractive power and having a meniscus shape with a convex surface toward the image side; a fourth lens having a positive refractive power and having a meniscus shape with a convex surface toward the image side; and a fifth lens having a negative refractive power, wherein an image-side surface of the fifth lens includes a concave surface and at least one inflection point, wherein a predetermined conditional expression is satisfied.

Abstract: A variable-magnification projection optical system substantially consists of a negative first lens group that is disposed at the most enlargement-side position and is fixed during magnification change, a positive last lens group that is disposed at the most reduction-side position and is fixed during magnification change, and a plurality of lens groups that are disposed between the first lens group and last lens group and are moved during magnification change. The most enlargement-side lens group (the second lens group) of the lens groups that are moved during magnification change has a negative refractive power. Predetermined conditional expressions relating to a back focus of the entire system on the reduction side at the wide-angle end, a focal length of the entire system at the wide-angle end, a focal length of the second lens group and a focal length of the last lens group are satisfied.

Abstract: Provided is an endoscope objective optical system 1 including, in order from an object side, a first lens 2 composed of a negative single lens, a second lens 3 composed of a positive single lens, an aperture stop 4, a third lens 5 composed of a positive single lens, and a fourth lens 6 composed of a positive combined lens, wherein the third lens 5 has a meniscus shape having a convex surface facing the image side. The endoscope objective optical system (1) satisfies the following conditions: 0.3<Df/f<1.15,??(1) n1<1.79,??(2) n2>n1,??(3) 0.6<IH/f<0.83,??(4) and |r1|?|r2|+d1>1.

Abstract: A variable-magnification projection optical system substantially consists of a negative first lens group that is disposed at the most enlargement-side position and is fixed during magnification change, a positive last lens group that is disposed at the most reduction-side position and is fixed during magnification change, and a plurality of lens groups that are disposed between the first lens group and last lens group and are moved during magnification change. The lens groups that are moved during magnification change substantially consist of three lens groups, wherein the most enlargement-side lens group is a negative lens group. Predetermined conditional expressions relating to a back focus of the entire system on the reduction side at the wide-angle end, a focal length of the entire system at the wide-angle end, a focal length of the last lens group, and a focal length of the first lens group are satisfied.

Abstract: A wide-angle lens is disclosed. The wide-angle lens includes a first lens element L1, a second lens element L2, a third lens element L3, an aperture diaphragm S, a fourth lens element L4 and a fifth lens element L5 arranged from an object plane to an image plane. The first element L1 is a meniscus lens element having a negative focal power and protruding toward the object plane, the second element L2 is a meniscus lens element having a negative focal power and protruding toward the object plane, the third element L3 is a meniscus lens element having a positive focal power and protruding toward the image plane, the fourth element L4 is a meniscus lens element having a negative focal power and protruding toward the object plane, and the fifth element L5 is a lens element having a positive focal power.

Abstract: The imaging lens substantially consists of a first lens having a biconvex shape, a second lens having a negative refractive power, a third lens having a negative refractive power and a convex surface that faces the object side, a fourth lens having a positive refractive power, and a fifth lens having a negative refractive power, of which at least one of the object-side surface and the image-side surface has at least one inflection point, in this order from the object side; and wherein conditional expression (1A): ?0.38<f/f45<?0.01 is satisfied. This conditional expression is related to the focal length f of the entire system and the combined focal length f45 of the fourth lens and the fifth lens.

Abstract: An exemplary embodiment of the present invention relates to an imaging lens, the imaging lens including, in an ordered way from an object side, a first lens having positive (+) refractive power, a second lens having negative (?) refractive power, a third lens having positive (+) refractive power, a fourth lens having negative (?) refractive power, and a fifth lens having a negative (?) refractive power, wherein the third lens takes a meniscus shape convexly formed at an object side.

Abstract: An imaging lens includes a lens barrel having a base wall with a light incident hole around an optical axis, an imaging unit disposed in the lens barrel and including imaging components arranged along the optical axis, and a light shielding plate having an annular fixing portion for positioning the light shielding plate and a bent portion bent from an inner periphery of the fixing portion and extending slantingly toward the optical axis. The light shielding plate is disposed at one of a position between the base wall and one of the imaging components that is adjacent to the base wall, and a position between two adjacent ones of the imaging components.