Abstract: An image taking lens LA comprises an aperture S1, a first lens L1 and a second lens L2 which are arranged in this order from an object side to an image side. The first lens L1 has a positive power and a meniscus shape with a convex surface facing an object; and the second lens L2 has a positive power with a convex surface facing an image. The first lens L1 and the second lens L2 satisfy the following formulae (1) and (2): 0.30<R1/R2<0.65??(1) 0.30<d3/F<0.50??(2) This image taking lens formed of the two lenses is small in size and has a high optical performance, in which the entire image taking lens has a short focal length.

Abstract: An image taking lens 1 comprises a stop 2, a first lens 3 having a positive power and biconvex configuration, a second lens 4 having a negative power and having a meniscus configuration in which a concave surface is disposed to face an object, a third lens 5 having a positive power and a meniscus configuration in which a convex surface is disposed to face an image, and a fourth lens 6 having a negative power and a meniscus configuration in which a convex surface is disposed to face the object, which are arranged in this order from the object. The lenses 3 to 6 satisfy the following formulae (1) to (4), 3.00<F1/d1<10.00??(1) ?20.0<F2/d3<?10.0??(2) 50.0<?1<60.0??(3) 20.0<?2<30.0??(4) hereupon, F1: focal length of the first lens; F2: focal length of the second lens; d1: a center thickness of the first lens; d3: a center thickness of the second lens; ?1: an Abbe's number of the first lens; and ?2: an Abbe's number of the second lens.

Abstract: The present invention provides an imaging lens that includes, in order from an object, a diaphragm S1; a first lens L1 with a positive power and a meniscus shape that is convex toward an object side; a second lens L2 with a negative power and a meniscus shape that is convex toward an image side; and a third lens L3 with a positive power and a meniscus shape that is convex toward the object side; the imaging lens satisfying Conditional Expressions (1) to (3): 0.95<f1/f<1.50 ??(1); ?0.50<f1/f2<?0.00 ??(2); and 0.40<d1/d2<0.70 ??(3); wherein: f: a focal length of the entire lens system; f1: a focal length of the first lens; f2: a focal length of the second lens; d1: a center thickness of the first lens; and d2: a distance between an image-side surface of the first lens and an object-side surface of the second lens.

Abstract: An image taking lens LA comprises an aperture S1, a first lens L1 and a second lens L2 which are arranged in this order from an object side to an image side. The firs lens L1 has a positive power and a meniscus shape with a convex surface facing an object; and the second lens L2 has a positive power with a convex surface facing an image. The first lens L1 and the second lens L2 satisfy the following formulae (1) and (2): 0.30<R1/R2<0.65 ??(1) 0.30<d3/F<0.50 ??(2) This image taking lens formed of the two lenses is small in size and has a high optical performance, in which the entire image taking lens has a short focal length.

Abstract: An image taking lens 1 comprises a stop 2, a first lens 3 having a positive power and biconvex configuration, a second lens 4 having a negative power and having a meniscus configuration in which a concave surface is disposed to face an object, a third lens 5 having a positive power and a meniscus configuration in which a convex surface is disposed to face an image, and a fourth lens 6 having a negative power and a meniscus configuration in which a convex surface is disposed to face the object, which are arranged in this order from the object. The lenses 3 to 6 satisfy the following formulae (1) to (4), 3.00<F1/d1<10.00??(1) ?20.0<F2/d3<?10.0??(2) 50.0<?1<60.0??(3) 20.0<?2<30.0??(4) hereupon, F1: focal length of the first lens; F2: focal length of the second lens; d1: a center thickness of the first lens; d3: a center thickness of the second lens; ?1: an Abbe's number of the first lens; and ?2: an Abbe's number of the second lens.

Abstract: A data processing system includes a host unit and terminal equipment connected thereto. Different terminal equipment is identified on the basis of a program provided on the side of the host unit and on the basis of data transaction with the hardware of the terminals. To this end, a microprogram is transferred from the host computer to the terminals, while the result of execution of the microprogram determined on the basis of the types of the terminals and components thereof is transferred to the host computer from the terminal. In this way, confidential security is assured between the host and the terminals.