Abstract: An imaging lens of which optical performance does not deteriorate even in a high temperature environment, various aberrations are well corrected, optical length is short, and back focus is sufficiently secured. This imaging lens comprises a first junction type compound lens 14, an aperture diaphragm S, a second junction type compound lens 16, and a third junction type compound lens 18, wherein the first junction type compound lens, the aperture diaphragm, the second junction type compound lens, and the third junction type compound lens are arranged in this sequence from an object side to an image side.

Abstract: A pickup lens is provided with various aberrations corrected satisfactorily, with a short optical length, and with a sufficient back focus secured. The configuration comprises an aperture diaphragm S1, first lens L1, second lens L2, and third lens L3, and is configured by arranging, in order from the object side to the image side, the aperture diaphragm, first lens, second lens, and third lens. The first lens is a lens having positive refractive power, with convex surfaces on the object side and on the image side. The second lens is a lens having negative refractive power, in a meniscus shape with the convex surface on the image side. The third lens is a lens having negative refractive power, in a meniscus shape with the convex surface on the object side. Both of the surfaces of the first lens are aspherical, both of the surfaces of the second lens are aspherical, and both of the surfaces of the third lens are aspherical.

Abstract: A pickup lens is provided with various aberrations corrected satisfactorily, with a short optical length, and with a sufficient back focus secured. The configuration comprises an aperture diaphragm S1, first lens L1, second lens L2, and third lens L3, and is configured by arranging, in order from the object side to the image side, the aperture diaphragm, first lens, second lens, and third lens. The first lens is a lens having positive refractive power, in a meniscus shape with the convex surface on the object side. The second lens is a lens having negative refractive power, in a meniscus shape with the convex surface on the image side. The third lens is a lens having negative refractive power, in a meniscus shape with the convex surface on the object side. Both of the surfaces of the first lens are aspherical, both of the surfaces of the second lens are aspherical, and both of the surfaces of the third lens are aspherical.

Abstract: In an imaging lens of the present invention, various types of aberration are corrected favorably, the optical length is short, and a sufficient back focus is secured. The imaging lens comprises an aperture diaphragm S1, a first lens L1, a second lens L2, and a third lens L3, and is constituted such that the aperture diaphragm, first lens, second lens, and third lens are arranged in succession from the object side toward the image side. The first lens has a positive refractive power and convex surfaces facing the object side and the image side. The second lens has a negative refractive power, a meniscus shape, and a convex surface facing the image side. The third lens L3 has a positive refractive power and convex surfaces facing the object side and the image side. Both surfaces of the first lens, both surfaces of the second lens, and both surfaces of the third lens L3 are aspherical.

Abstract: In an imaging lens of the present invention, various types of aberration are corrected favorably, the optical length is short, and a sufficient back focus is secured. The imaging lens comprises an aperture diaphragm S1, a first lens L1, a second lens L2, and a third lens L3, and is constituted such that the aperture diaphragm, first lens, second lens, and third lens are arranged in succession from the object side toward the image side. The first lens has a positive refractive power and convex surfaces facing the object side and the image side. The second lens has a negative refractive power, a meniscus shape, and a convex surface facing the image side. The third lens L3 has a positive refractive power and convex surfaces facing the object side and the image side. Both surfaces of the first lens, both surfaces of the second lens, and both surfaces of the third lens L3 are aspherical.

Abstract: The present invention relates to an imaging lens with an number in the range 4.0, configured from two lenses, with a short lens optical length, and with sufficiently high image contrast so that sharp images are obtained. The imaging lens is configured by positioning, order from an object side to an image side, an aperture diaphragm, diaphragm, and a second lens, satisfying the following first lens, a second conditions. The first lens and second lens are both meniscus-shaped with convex surface facing the positive refractive power.

Abstract: A pickup lens is provided in which various aberrations are satisfactorily corrected, which can be manufactured at low cost, and which has an optical length of 10 mm or less. This pickup lens is configured by arranging, in order from the object side, a first lens L1 with a meniscus shape with concave surface on the object side and having negative refractive power, an aperture diaphragm S, a second lens L2 with convex surfaces on both sides and having positive refractive power, a third lens L3 with concave surfaces on both sides and having negative refractive power, and a fourth lens L4 with convex surfaces on both sides and having positive refractive power; and with the following conditions satisfied. +5.0<(r2+r1)/(r2?r1)<+7.0??(1) 0.15f<d1<0.

Abstract: The present invention is an imaging lens in which various aberrations are satisfactorily corrected, the optical length is short, and a sufficient back focus is secured. The imaging lens is constituted by arranging a first lens L1, an aperture diaphragm S1, a second lens L2, and a third lens L3 in succession from the object side to the image side.

Abstract: In an imaging lens of the present invention, aberration is satisfactorily corrected, the optical length is short, and sufficient back focus is secured. The imaging lens of the present invention is constituted by arranging a first lens L1, an aperture diaphragm S1, a second lens L2, and a third lens L3 in succession from the object side to the image side.

Abstract: The present invention is an imaging lens in which various aberrations are favorably corrected, the optical length is short, and a sufficient back focus is secured. The imaging lens is constituted by arranging a first lens L1, an aperture diaphragm S1, a second lens L2, and a third lens L3 in succession from the object side to the image side. The first lens L1 is a lens having a positive refractive power and a meniscus shape in which the convex surface faces the object side, the second lens L2 is a lens having a negative refractive power and a meniscus shape in which the convex surface faces the image side, and the third lens L3 is a lens in which the convex surface faces the object side.

Abstract: The present invention is an imaging lens in which various aberrations are favorably corrected, the optical length is short, and a sufficient back focus is secured. The imaging lens is constituted by arranging a first lens L1, an aperture diaphragm S1, a second lens L2, and a third lens L3 in succession from the object side to the image side. The first lens L1 is a lens having a positive refractive power and a meniscus shape in which the convex surface faces the object side, the second lens L2 is a lens having a negative refractive power and a meniscus shape in which the convex surface faces the image side, and the third lens L3 is a lens in which the convex surface faces the object side. The imaging lens satisfies the following conditions: 0.35<r1/r2<0.45 (1) 0.07<D2/f<0.1 (2) 0.01<D4/f<0.04 (3) 1.00<d/f<1.30 (4) 0.3<bf/f<0.

Abstract: The present invention relates to an imaging lens with an F-number in the range 2.0 to 4.0, configured from only two lenses, with a short lens optical length, and with sufficiently high image contrast so that sharp images are obtained. The imaging lens is configured by positioning, in order from an object side to an image side, an aperture diaphragm, a first lens, a second diaphragm, and a second lens, satisfying the following conditions. The first lens and second lens are both meniscus-shaped with convex surface facing the object side, and have positive refractive power. 0.3<f1/f2<1.0 ??(1) 0.4<bf/f<0.5 ??(2) 1.0<d/f<1.3 ??(3) 0.12<D2/f<0.30 ??(4) 2.0<Fno<4.

Abstract: The present invention is an imaging lens in which various aberrations are satisfactorily corrected, the optical length is short, and a sufficient back focus is secured. The imaging lens is constituted by arranging a first lens L1, an aperture diaphragm S1, a second lens L2, and a third lens L3 in succession from the object side to the image side, and thus satisfies the following conditions. 0.40<r1/r2<0.65??(1) 0.08<D2/f<0.1??(2) 0.2<D3/f<0.3??(3) 1.0<d/f<1.5??(4) 0.4<bf/f<0.

Abstract: A lens for image pickup is provided in which various aberrations are corrected satisfactorily, the optical length is at maximum approximately 6 mm, and moreover a sufficient back focus is secured. This lens for image pickup comprises a first lens, an aperture diaphragm, and a second lens, positioned in this order from the object side toward the image side. The first lens is a resin lens with a meniscus shape, with the convex surface facing the object side, and having positive refractive power. The second lens is a resin lens with a meniscus shape, with the convex surface facing the image side, and having positive refractive power.

Abstract: In an imaging lens of the present invention, aberration is satisfactorily corrected, the optical length is short, and a sufficient back focus is secured. The imaging lens of the present invention is constituted by arranging a first lens L1, an aperture diaphragm S1, a second lens L2, and a third lens L3 in succession from the object side to the image side, and thus satisfies the following conditions. 0.24<r1/r2<0.34??(1) 0.08<D2/f<0.1??(2) 0.24<D3/f<0.29??(3) 1.0<d/f<1.

Abstract: An image pickup lens is provided in which various aberrations are satisfactorily corrected, and the optical length is not more than 6 mm, and moreover a sufficient back focus is secured. This image pickup lens is configured by arranging, in order from the object side, an aperture diaphragm S1; a first lens L1 having a meniscus shape with concave surface facing the object side, and having positive refractive power; a second diaphragm S2; and a second lens L2 having a meniscus shape with concave surface facing the image side, and having negative refractive power. The aperture diaphragm S1 forms an incidence plane. The second diaphragm S2 provided between the first lens L1 and the second lens L2 is inserted in order to cut out so-called flare, which is light which strikes the peripheral edge of a lens or similar and is irregularly reflected.

Abstract: An imaging lens comprising, in sequence from the object side to the image side: an aperture diaphragm, a first lens, a second diaphragm, and a second lens; the first lens consisting of a meniscus-shaped lens having positive power with a concave face oriented towards the object side; the second lens consisting of a meniscus-shaped lens with a concave face oriented towards the image side; wherein at least one face of the first lens is an aspherical face, and one or more faces of the second lens is an aspherical face, in such a manner that the imaging lens as a whole is a lens system comprising at least two aspherical faces, and satisfying each of the following condition equations (1), (2), (3). 0.01<|f1|/|f2|<0.6  (1) 0.3f<|R2|<0.6f  (2) 0.5f<D0<1.