An imaging lens substantially consists of a first lens-group, a stop and a second lens-group in this order from an object-side. The first lens-group substantially consists of three or less lenses including at least one negative lens and a positive lens. The second lens-group substantially consists of a 21st lens-group and a 22nd lens-group in this order from the object-side. The 21st lens-group substantially consists of three or less lenses and has positive refractive-power. The 22nd lens-group substantially consists of two lenses of a negative lens and a positive lens in this order from the object-side. Predetermined conditional formulas about distance on an optical-axis from a most-object-side lens surface in an entire system to an image-plane, maximum image height, distance on the optical-axis from a most-object-side lens surface in the first lens-group to a most-image-side lens surface in the second lens-group, and focal-length of the entire system are satisfied.

Imaging lens and imaging apparatus

This invention provides a photographing optical lens assembly, from an object side to an image side in order, comprising a first lens element with positive refractive power having a convex object-side surface, a second lens element with negative refractive power having a concave image-side surface, a third lens element with positive refractive power, a fourth lens element with negative refractive power having a concave image-side surface, both the two surfaces of the fourth lens thereof being aspheric. And an aperture stop is positioned between the first element and the second lens element. There are four lens elements with refractive power in the lens assembly.

Photographing optical lens assembly

[Problem] To enable a reduction in size, a reduction in costs, the widening of the angle of view and an increase in performance of an imaging lens, and also to eliminate restrictions on the imaging element used. [Solution] An imaging lens (1) is formed substantially from six lenses in the following order from the object side: a negative first lens (L1); a negative second lens (L2); a positive third lens (L3); a positive fourth lens (L4); a negative fifth lens (L5); and a positive sixth lens (L6). The surface on the object side of the second lens (L2) is a concave surface, and the surface on the object side of the third lens (L3) is a concave surface.

Imaging lens and imaging device

A six-piece optical lens for capturing image and a six-piece optical module for capturing image are provided. In order from an object side to an image side, the optical lens along the optical axis includes a first lens with refractive power, a second lens with refractive power, a third lens with refractive power, a fourth lens with refractive power, a fifth lens with refractive power and a sixth lens with refractive power. At least one of the image-side surface and object-side surface of each of the six lens elements is aspheric. The optical lens can increase aperture value and improve the imagining quality for use in compact cameras.

Optical image capturing system

Provided is a high-performance objective optical system which is compatible with a high-pixel-count image acquisition device, in which focusing can be achieved according to a change in object point distance and which has sufficient depth of field at the individual object point distances Provided is an objective optical system (1) including, in order from an object side, a first group (G1), a second group (G2), and a third group (G3), in which the first group (G1) includes, in order from the object side, a plano-concave lens (L1) and a meniscus lens (L2) whose convex surface is towards an image side and in which the second group (G2) has positive power and moves in the direction of an optical axis to perform focusing

Objective optical system

PROBLEM TO BE SOLVED: To achieve a size reduction, a wider angle, and a cost reduction in an image pickup lens while maintaining the high optical performance in which color aberrations are satisfactorily corrected SOLUTION: The image pickup lens includes, in order from the object side: a first lens group G1 that has negative refractive power as a whole; a second lens group G2 that has positive or negative power as a whole; an aperture diaphragm; a third lens group G3 that has positive power as a whole; and a diffractive optical element GD in which at least one face is flat and a diffractive structure is formed on at least one face When the focal distance of the entire system is defined as f and the focal distance of the diffractive optical element GD is f DOE , conditional expression (1)-02<f/f DOE <02 is satisfied COPYRIGHT: (C)2009,JPO&INPIT

Image pickup lens and image pickup apparatus

An imaging lens is provided and includes, in order from the object side, a front group having a negative power, a stop, and a rear group having a positive power. The front group includes, in order from the object side, a first negative lens having a meniscus shape with a concave surface on an image side, a second negative lens, and a third positive lens. The rear group includes, in order from the object side, a fourth positive lens, a fifth negative lens having a meniscus shape with a concave surface on the object side, and a sixth positive lens. An Abbe number of each of the first lens, the second lens, the fourth lens, and the sixth lens at the d-line is equal to or larger than 40, and an Abbe number of each of the third lens and the fifth lens at the d-line is equal to or smaller than 40. Each lens constituting the front group and the rear group is a single lens.

Imaging lens and imaging apparatus using imaging lens

A wide-angle imaging lens is provided and includes: a first lens, a second lens, and a third lens in this order from the object side. The first lens is a negative meniscus and has a convex surface on the object side; the second lens, at least one surface of which is an aspherical surface; and the third lens is a positive lens and has a convex surface on the image side and at least one surface of the third lens is an aspherical surface. The first len is made of a material having an Abbe number of 40 or more and the third lens is made of a material having an Abbe number of 50 or more. An aperture stop is disposed between the second lens and the third lens.

Wide-angle imaging lens

This aims at providing an imaging lens having small size, low cost, high environment-resistance, a wide angle of view, a small F-number and high performance, and an imaging apparatus including the imaging lens. An imaging lens (1) consists of negative first lens (L1) having a concave image-side surface, positive second lens (L2), negative third lens (L3), positive fourth lens (L4), positive fifth lens (L5) having a convex image-side surface, and negative sixth lens (L6), which are in this order from an object side. In the imaging lens (1), all of the lenses constituting the lens system are single lenses, which are not cemented lenses, and a stop is arranged closer to the object side than an image-side surface of the fourth lens (L4) is arranged. When a refractive index of a material of the third lens (L3) for d-line is Nd3, the following formula (1) is satisfied: Nd ⁢ 3 < 1.75

Taro Asami

Papers

Imaging lens and imaging device

Image pickup lens and image pickup apparatus

Imaging lens and imaging apparatus using imaging lens

Wide-angle imaging lens

Image pickup lens and image pickup device