Abstract: An optical lens includes a first lens group, a second lens group and an aperture stop. The first lens group includes three lenses with refractive powers. The second lens group has a positive refractive power and includes two lenses with refractive power. The aperture stop is disposed between the first lens group and the second lens group. The optical lens satisfies the conditions of 2 mm<DL<6 mm, LT<15 mm and 0.2<DL/LT<0.38, where DL is a diameter of a lens surface of the second lens group furthest from the first lens group, and LT is a length measured on the optical axis between two outermost lens surfaces of the optical lens.

Abstract: An optical lens includes a first lens, a second lens, a third lens, a fourth lens and a fifth lens arranged in order from a magnified side to a minified side. A sum of refractive powers of the first lens and the second lens is negative, and a sum of refractive powers of the third lens, the fourth lens and the fifth lens is positive. The first lens is a glass lens with a negative refractive power, the second lens is a plastic lens, and the third lens, the fourth lens and the fifth lens are composed of one glass lens with an Abbe number of larger than 60 and two plastic lenses.

Abstract: A lens module for capturing an object light-beam from an object-side is provided. The lens module includes a first lens group, a second lens group, a third lens group, a fourth lens group and a fifth lens group sequentially-arranged from the object-side to an image-side. The five lens groups respectively have at least one lens with positive refractive-power and at least one lens with negative refractive-power. The first, third and fifth lens groups are fixed groups, while the second and fourth lens groups are movable groups. An image apparatus including the lens module is also provided.

Abstract: An optical lens includes a first lens group with a positive refractive power, a second lens group with a positive refractive power and an aperture stop. The first lens group and the second lens group are arranged in order from a first side to a second side, and the aperture stop is disposed between the first lens group and the second lens group. A total number of lenses with refractive powers in the optical lens is less than four, and the optical lens includes at least two lenses having an index of refraction of greater than 1.7.

Abstract: A lens assembly including a first lens, a second lens, a third lens, a fourth lens, and a fifth lens, arranged from the magnification side to the reduction side, is provided. The fourth lens and the fifth lens are combined into a cemented lens having an aspherical surface. The lens assembly includes 5 to 6 lenses with a refractive power. The first lens is a glass lens, and the others are aspherical lenses. R1 is the radius of curvature of the lens surface of the first lens facing the magnification side, R2 is the radius of curvature of the lens surface of the first lens facing the reduction side, T is the thickness, on the optical axis of the lens assembly, of the first lens, wherein the refractive index of the first lens>1.55, the Abbe number of the first lens>55, and R1-R2-T<8.8.

Abstract: An optical lens includes two lens groups and an aperture stop. A total number of lenses with refractive power of the two lens groups is larger than three, and the two lens groups includes an aspheric lens with negative refractive power. The aperture stop is disposed between the two lens groups. The optical lens satisfies the following condition: 0.05>[y(?)?(EFL*sin ?)]/(EFL*sin ?)>?0.3, where ? denotes a half field of view, y(?) denotes an image height of an image plane for visible light with respect to the half field of view ?, and EFL denotes an effective focal length for visible light of the optical lens.

Abstract: An optical lens includes a first lens group, a second lens group and an aperture stop. The first lens group includes three lenses with refractive powers. The second lens group has a positive refractive power and includes two lenses with refractive power. The aperture stop is disposed between the first lens group and the second lens group. The optical lens satisfies the conditions of 2 mm<DL<6 mm, LT<15 mm and 0.2<DL/LT<0.38, where DL is a diameter of a lens surface of the second lens group furthest from the first lens group, and LT is a length measured on the optical axis between two outermost lens surfaces of the optical lens.

Abstract: An optical lens includes five aspheric lenses and an aperture stop. The five aspheric lenses are, arranged in order from a first side to a second side, a first lens, a second lens, a third lens, a fourth lens and a fifth lens, and the aperture stop is disposed between the first lens and the second lens. An image height at the image plane is denoted as H, the image height is equally divided into ten sections to from ten height positions 0.1H, 0.2H, 0.3H, 0.4H, 0.5H, 0.6H, 0.7H, 0.8H, 0.9H and 1H. Chief rays traveling through the optical lens and to the ten height positions respectively form ten angles with respect to a normal of an image plane, and each of the ten angles is smaller than 10 degrees.

Abstract: An optical lens includes a first lens group with negative refractive power, a second lens group with positive refractive power, and an aperture stop disposed between the first lens group and the second lens group. A total number of lenses in the first lens group is less than three, and a total number of lenses in the second lens group is less than five. The second lens group includes a first lens, a second lens and a third lens arranged in order in a direction away from the aperture stop. Each of the first lens and the second lens is an aspheric lens, and one of the first lens and the second lens has a diffractive optical surface.

Abstract: A lens module for capturing an object light-beam from an object-side is provided. The lens module includes a first lens group, a second lens group, a third lens group, a fourth lens group and a fifth lens group sequentially-arranged from the object-side to an image-side. The five lens groups respectively have at least one lens with positive refractive-power and at least one lens with negative refractive-power. The first, third and fifth lens groups are fixed groups, while the second and fourth lens groups are movable groups. An image apparatus including the lens module is also provided.

Abstract: A lens assembly including a first lens, a second lens, a third lens, a fourth lens, and a fifth lens, arranged from the magnification side to the reduction side, is provided. The fourth lens and the fifth lens are combined into a cemented lens having an aspherical surface. The lens assembly includes 5 to 6 lenses with a refractive power. The first lens is a glass lens, and the others are aspherical lenses. R1 is the radius of curvature of the lens surface of the first lens facing the magnification side, R2 is the radius of curvature of the lens surface of the first lens facing the reduction side, T is the thickness, on the optical axis of the lens assembly, of the first lens, wherein the refractive index of the first lens>1.55, the Abbe number of the first lens>55, and R1-R2-T<8.8.

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. 0.52>F/H>0.46, where F is an effective focal length, and H is an image height.

Abstract: An optical lens includes a first lens group with a positive refractive power, a second lens group with a positive refractive power and an aperture stop. The first lens group and the second lens group are arranged in order from a first side to a second side, and the aperture stop is disposed between the first lens group and the second lens group. A total number of lenses with refractive powers in the optical lens is less than four, and the optical lens includes at least two lenses having an index of refraction of greater than 1.7.

Abstract: An optical lens includes a first lens, a second lens, a third lens, a fourth lens and a fifth lens arranged in order from a magnified side to a minified side. A sum of refractive powers of the first lens and the second lens is negative, and a sum of refractive powers of the third lens, the fourth lens and the fifth lens is positive. The first lens is a glass lens with a negative refractive power, the second lens is a plastic lens, and the third lens, the fourth lens and the fifth lens are composed of one glass lens with an Abbe number of larger than 60 and two plastic lenses.

Abstract: An optical lens includes a first lens group, a second lens group and an aperture stop. The first lens group and the second lens group are arranged in order along a direction, and the aperture stop is disposed between the first lens group and the second lens group. The second lens group has positive refractive power and a lens with a diffractive optical surface, and the optical lens satisfies the condition: 2<(?d*V)/?r<5, where ?d denotes refractive power of the diffractive optical surface, ?r denotes refractive power of the lens, and V denotes an Abbe number of the lens.

Abstract: An optical lens includes five aspheric lenses and an aperture stop. The five aspheric lenses are, arranged in order from a first side to a second side, a first lens, a second lens, a third lens, a fourth lens and a fifth lens, and the aperture stop is disposed between the first lens and the second lens. An image height at the image plane is denoted as H, the image height is equally divided into ten sections to from ten height positions 0.1H, 0.2H, 0.3H, 0.4H, 0.5H, 0.6H, 0.7H, 0.8H, 0.9H and 1H. Chief rays traveling through the optical lens and to the ten height positions respectively form ten angles with respect to a normal of an image plane, and each of the ten angles is smaller than 10 degrees.

Abstract: An optical lens includes a first lens group with negative refractive power, a second lens group with positive refractive power, and an aperture stop disposed between the first lens group and the second lens group. A number of lenses with refractive power of the first lens group is smaller than three, and a number of lenses with refractive power of the second lens group is smaller than five. The second lens group has a lens with a diffractive optical surface, and the lens with a diffractive optical surface satisfies the condition: 0<|(?d*V)/?r|<2, where ?d denotes refractive power of the diffractive optical surface, ?r denotes refractive power of the lens, and V denotes an Abbe number of the lens with a diffractive optical surface.

Abstract: An optical lens includes a first lens group with negative refractive power, a second lens group with positive refractive power, and an aperture stop disposed between the first lens group and the second lens group. A total number of lenses in the first lens group is less than three, and a total number of lenses in the second lens group is less than five. The second lens group includes a first lens, a second lens and a third lens arranged in order in a direction away from the aperture stop. Each of the first lens and the second lens is an aspheric lens, and one of the first lens and the second lens has a diffractive optical surface.

Abstract: An optical lens includes two lens groups and an aperture stop. A total number of lenses with refractive power of the two lens groups is larger than three, and the two lens groups includes an aspheric lens with negative refractive power. The aperture stop is disposed between the two lens groups. The optical lens satisfies the following condition: 0.05>[y(?)?(EFL*sin ?)]/(EFL*sin ?)>?0.3, where ? denotes a half field of view, y(?) denotes an image height of an image plane for visible light with respect to the half field of view ?, and EFL denotes an effective focal length for visible light of the optical lens.

Abstract: An optical lens includes a first lens group with negative refractive power, a second lens group with positive refractive power, and an aperture stop disposed between the first lens group and the second lens group. A number of lenses with refractive power of the first lens group is smaller than three, and a number of lenses with refractive power of the second lens group is smaller than five. The second lens group has a lens with a diffractive optical surface, and the lens with a diffractive optical surface satisfies the condition: 0<|(?d*V)/?r|<2, where ?d denotes refractive power of the diffractive optical surface, ?r denotes refractive power of the lens, and V denotes an Abbe number of the lens with a diffractive optical surface.