Abstract: An exemplary zoom lens system includes a negative first lens group and a positive second lens group. The first lens group includes a meniscus-shaped first lens with negative refracting power and a second lens with positive refracting power. The first lens has a concave surface facing an image side. The second lens group includes an aperture stop, a biconvex third lens with positive refracting power, and a meniscus-shaped fourth lens with negative refracting power. The fourth lens has a concave surface facing an object side. The first lens, the second lens, the aperture stop, the third lens and the fourth lens are aligned in that order from the object side to the image side.

Abstract: A Fourier transform lens system includes a first lens group having positive power, a second lens group having positive power, and a third lens group having negative power, all arranged on a common optical axis in that sequence. The first lens group includes a first positive meniscus lens, and a negative meniscus lens adjacent to the second lens group. The first positive meniscus lens has a concave lens surface facing toward a concave lens surface of the negative meniscus lens. The second lens group includes at least one bi-convex lens. The third lens group includes a second positive meniscus lens adjacent to the second lens group and a bi-concave lens. The second positive meniscus lens has a convex lens surface facing toward the second lens group. The Fourier transform lens system satisfies the following conditions: (1) 0.8<f2/f<1.4; (2) ?1.3<R12F/f<?0.7; (3) 0.35<R31F/f<0.75; and (4) 0.3<R32R/f<0.7.

Abstract: An image pick-up lens system from an object side to an image side includes an aperture stop (10), and a meniscus-shaped lens (20) having a concave surface on the object side and a convex surface on the image side. The lens has at least one aspheric surface and a diffraction grating provided on the convex surface thereof. The lens system satisfies the following condition: (1) 0.1<R2/R1<0.5, wherein, R1 is an absolute value of a radius of curvature of the concave surface of the lens, and R2 is an absolute value of a radius of curvature of the convex surface of the lens. Condition (1) governs a distribution of refracting power for the lens, in order to correct monochromatic aberrations. The lens system also satisfies other conditions (2)-(4) as disclosed, in order to provide compactness, cost-effectiveness and improved optical performance.

Abstract: An image pick-up lens system includes an aperture stop (10), a biconvex first lens (20), and a meniscus-shaped second lens (30) having a concave surface on a side of an object. The aperture stop, the first lens and the second lens are aligned in that order from the object side to an image side. Each of the lenses has at least one aspheric surface, and the following conditions are satisfied: (1) 0.5<f1/f<0.9, and (2) 1<T/f<1.62, wherein f1 is a focal length of the first lens, f is a focal length of the system, and T is a length from the aperture stop to an image pick-up surface of the image side.

Abstract: An image pick-up lens system includes an aperture stop (10), a biconvex first lens (20), a second lens (30) having a concave surface on an object side, and a third lens (40) having a concave surface on an image side. The aperture stop (10), the first lens (20), the second lens (30) and the third lens (40) are aligned in that order from the object side to the image side. All lenses in the system are made from a plastic or resin material, and one of them has a diffraction grating formed on a surface. The system satisfies conditions (1)-(5) as disclosed, in order to provide compactness, cost-effectiveness and improved optical performance.

Abstract: An image pick-up lens system includes an aperture stop (10), a biconvex first lens (20), and a meniscus-shaped second lens (30) having a concave surface on a side of an object. The aperture stop, the first lens and the second lens are aligned in that order from the object side to an image side. Each of the lenses has at least one aspheric surface, and both lenses are made from a same plastic or a resin. The system satisfies the following condition: (1) 1<T/f<1.7, wherein f is a focal length of the system, and T is a length from the aperture stop to an image pick-up surface of the image side. The first condition (1) limits the total length of the system in order to provide compactness. The system also satisfies other conditions (2)–(5) as disclosed, in order to provide compactness and cost-effectiveness and to correct fundamental aberrations.

Abstract: An image pick-up lens system includes an aperture stop (10), a first lens (20), and a second lens (30) having a concave surface on an object side. The aperture stop, the first lens and the second lens are aligned in that order from the object side to an image side. The first lens has positive refracting power and has a diffraction grating formed on a convex surface on the image side. The second lens has positive refracting power. The system satisfies the following condition: (1) 1.4<T/f<1.7, wherein f is a focal length of the system, and T is a length from the aperture stop to an image pick-up surface (50) of the image side. Condition (1) limits the total length of the system in order to provide compactness. The system also satisfies other conditions (2)–(5) as disclosed, in order to provide compactness, cost-effectiveness and improved optical performance.

Abstract: A Fourier transform lens system includes: a first lens group having negative power and a second lens group having positive power disposed at one side of the first lens group with the first lens group and the second lens group being arranged on a common optical axis. The first lens group includes two negative meniscus lenses each having negative power, and each of the negative meniscus lenses has a concave lens surface facing toward a concave lens surface of the other negative meniscus lens. The second lens group includes a positive lens having a convex lens surface facing toward the first lens group. The Fourier transform lens system satisfies the following conditions: (1) 0.1<R1R/f<0.4; (2) ?0.4<R2F/f<?0.1; and (3) 0.1<d12/f<0.3. A holographic storage system using a Fourier transform lens system is also provided.

Abstract: An exemplary zoom lens system includes a negative first lens group and a positive second lens group. The first lens group includes a meniscus-shaped first lens with negative refracting power and a second lens with positive refracting power. The first lens has a concave surface facing an image side. The second lens group includes an aperture stop, a biconvex third lens with positive refracting power, and a meniscus-shaped fourth lens with negative refracting power. The fourth lens has a concave surface facing an object side. The first lens, the second lens, the aperture stop, the third lens and the fourth lens are aligned in that order from the object side to the image side.

Abstract: An image pick-up lens system includes an aperture stop (10), a biconvex first lens (20), and a meniscus-shaped second lens (30) having a concave surface on a side of an object. The aperture stop, the first lens and the second lens are aligned in that order from the object side to an image side. Each of the lenses has at least one aspheric surface, and at least one of the lenses is made from an optical glass. The system satisfies the following condition: (1) 1<T/f<1.6, wherein f is a focal length of the system, and T is a length from the aperture stop to an image pick-up surface of the image side. The first condition (1) limits the total length of the system in order to provide compactness. The system also satisfies other conditions (2)–(6) as disclosed, in order to provide compactness, improved optical performance, and cost-effectiveness.

Abstract: A Fourier transform lens system includes a first lens group having positive power, a second lens group having positive power, and a third lens group having negative power, all arranged on a common optical axis in that sequence. The first lens group includes a first positive meniscus lens, and a negative meniscus lens adjacent to the second lens group. The first positive meniscus lens has a concave lens surface facing toward a concave lens surface of the negative meniscus lens. The second lens group includes at least one bi-convex lens. The third lens group includes a second positive meniscus lens adjacent to the second lens group and a bi-concave lens. The second positive meniscus lens has a convex lens surface facing toward the second lens group. The Fourier transform lens system satisfies the following conditions: (1) 0.8<f2/f<1.4; (2) ?1.3<R12F/f<?0.7; (3) 0.35<R31F/f<0.75; and (4) 0.3<R32R/f<0.7.

Abstract: A Fourier transform lens system includes: a first lens group having negative power and a second lens group having positive power disposed at one side of the first lens group with the first lens group and the second lens group being arranged on a common optical axis. The first lens group includes two negative meniscus lenses each having negative power, and each of the negative meniscus lenses has a concave lens surface facing toward a concave lens surface of the other negative meniscus lens. The second lens group includes a positive lens having a convex lens surface facing toward the first lens group. The Fourier transform lens system satisfies the following conditions: (1) 0.1<R1R/f<0.4; (2) ?0.4<R2F/f<?0.1; and (3) 0.1<d12/f<0.3. A holographic storage system using a Fourier transform lens system is also provided.

Abstract: An image pick-up lens system includes an aperture stop (10), a biconvex first lens (20), a second lens (30) having a concave surface on an object side, and a third lens (40) having a concave surface on an image side. The aperture stop (10), the first lens (20), the second lens (30) and the third lens (40) are aligned in that order from the object side to the image side. All lenses in the system are made from a plastic or resin material, and one of them has a diffraction grating formed on a surface. The system satisfies conditions (1)-(5) as disclosed, in order to provide compactness, cost-effectiveness and improved optical performance.

Abstract: An image pick-up lens system includes an aperture stop (10), a biconvex first lens (20), and a meniscus-shaped second lens (30) having a concave surface on a side of an object. The aperture stop, the first lens and the second lens are aligned in that order from the object side to an image side. Each of the lenses has at least one aspheric surface, and both lenses are made from a same plastic or a resin. The system satisfies the following condition: (1) 1<T/f<1.7, wherein f is a focal length of the system, and T is a length from the aperture stop to an image pick-up surface of the image side. The first condition (1) limits the total length of the system in order to provide compactness. The system also satisfies other conditions (2)-(5) as disclosed, in order to provide compactness and cost-effectiveness and to correct fundamental aberrations.

Abstract: An image pick-up lens system includes an aperture stop (10), a first lens (20), and a second lens (30) having a concave surface on an object side. The aperture stop, the first lens and the second lens are aligned in that order from the object side to an image side. The first lens has positive refracting power and has a diffraction grating formed on a convex surface on the image side. The second lens has positive refracting power. The system satisfies the following condition: (1) 1.4<T/f<1.7, wherein f is a focal length of the system, and T is a length from the aperture stop to an image pick-up surface (50) of the image side. Condition (1) limits the total length of the system in order to provide compactness. The system also satisfies other conditions (2)-(5) as disclosed, in order to provide compactness, cost-effectiveness and improved optical performance.

Abstract: An image pick-up lens system from an object side to an image side includes an aperture stop (10), and a meniscus-shaped lens (20) having a concave surface on the object side and a convex surface on the image side. The lens has at least one aspheric surface and a diffraction grating provided on the convex surface thereof. The lens system satisfies the following condition: (1) 0.1<R2/R1<0.5, wherein, R1 is an absolute value of a radius of curvature of the concave surface of the lens, and R2 is an absolute value of a radius of curvature of the convex surface of the lens. Condition (1) governs a distribution of refracting power for the lens, in order to correct monochromatic aberrations. The lens system also satisfies other conditions (2)-(4) as disclosed, in order to provide compactness, cost-effectiveness and improved optical performance.

Abstract: An image pick-up lens system includes an aperture stop (10), a biconvex first lens (20), and a meniscus-shaped second lens (30) having a concave surface on a side of an object. The aperture stop, the first lens and the second lens are aligned in that order from the object side to an image side. Each of the lenses has at least one aspheric surface, and at least one of the lenses is made from an optical glass. The system satisfies the following condition: (1) 1<T/f<1.6, wherein f is a focal length of the system, and T is a length from the aperture stop to an image pick-up surface of the image side. The first condition (1) limits the total length of the system in order to provide compactness. The system also satisfies other conditions (2)-(6) as disclosed, in order to provide compactness, improved optical performance, and cost-effectiveness.

Abstract: An image pick-up lens system includes an aperture stop (10), a biconvex first lens (20), and a meniscus-shaped second lens (30) having a concave surface on a side of an object. The aperture stop, the first lens and the second lens are aligned in that order from the object side to an image side. Each of the lenses has at least one aspheric surface, and the following conditions are satisfied: (1) 0.5<fl/f<0.9, and (2) 1<T/f<1.62, wherein fl is a focal length of the first lens, f is a focal length of the system, and T is a length from the aperture stop to an image pick-up surface of the image side.