Kantatsu Co., Ltd.

Tokyo Visionary Optics Co., Ltd.

Nkk Corporation

Optical Logic Inc.

Yukio Sekine

Masaya Hashimoto

Koji Nitta

Kenichi Kamada

Tomohiro Yonezawa

Koki Tokuno

Tsuyoshi Shiozaki

Hisanori Suzuki

Moriaki Ono

Masanori Ohmura

Kenichi Iwazaki

Akio Sato

Yutaka Nagahama

Zhiyu Huang

Hitoshi Hirano

Yoji Kubota

Kenichi Kubota

Ichiro Kurihara

Ruidong Yang

There is provided an imaging lens with excellent optical characteristics which satisfies demand of a low profile and a low F-number. An imaging lens comprises in order from an object side to an image side, a first lens with positive refractive power, a second lens, a third lens, a fourth lens, a fifth lens with positive refractive power, a sixth lens, and a seventh lens with negative refractive power, wherein said first lens has an object-side surface being convex in a paraxial region, and said fifth lens has an image-side surface being convex in a paraxial region, and predetermined conditional expressions are satisfied.

Imaging lens

There is provided an imaging lens with excellent optical characteristics which satisfies demand of a low profile and a low F-number. An imaging lens comprises in order from an object side to an image side, a first lens with positive refractive power, a second lens with positive refractive power, a third lens with negative refractive power, a fourth lens with positive refractive power, a fifth lens with positive refractive power, a sixth lens, and a seventh lens with negative refractive power, wherein said first lens has an object-side surface being convex in a paraxial region, said second lens has an image-side surface being convex in a paraxial region, said third lens has an object-side surface being concave in a paraxial region, said fourth lens has an object-side surface being concave in a paraxial region, said sixth lens has an object-side surface being convex in a paraxial region, and said seventh lens has an image-side surface being concave in a paraxial region.

Imaging lens including seven lenses of ++−++−− or ++−+++− refractive powers

There is provided an imaging lens with excellent optical characteristics which satisfies demand of a low profile and a low F-number. An imaging lens comprises in order from an object side to an image side, a first lens with positive refractive power, a second lens with negative refractive power, a third lens with positive or negative refractive power, a fourth lens with negative refractive power, a fifth lens with positive refractive power, and a sixth lens with negative refractive power, wherein said first lens is formed in a meniscus shape having an object-side surface being convex in a paraxial region, said second lens has an object-side surface being convex in a paraxial region, said sixth lens has an image-side surface being concave in a paraxial region, and the predetermined conditional expressions are satisfied.

There is provided a compact and high-resolution imaging lens at a low cost. The imaging lens comprises in order from an object side to an image side, a first lens having positive refractive power and a convex surface facing the object side near an optical axis, a second lens having negative refractive power and a meniscus shape having the convex surface facing the object side near the optical axis, a third lens having the positive or the negative refractive power, a fourth lens having the convex surface facing the image side near the optical axis, a fifth lens having the positive refractive power, a sixth lens having the positive refractive power, and a seventh lens having the negative refractive power and a concave surface facing the image side near the optical axis, the image side surface of said seventh lens is formed as an aspheric surface which changes to the convex surface at a peripheral area, the object-side surface of said fifth lens has the convex surface facing the object side near the optical axis, all lenses are single lenses arranged with an interval between lenses adjacent to each other, and below conditional expressions (1), (2) and (3) are satisfied:(1) 1.50<Nd1<1.60(2) −8.0<2/<−2.0(3) 0.3<2/3<3.3whereNd1: refractive index at d-ray of the first lens,f: focal length of the overall optical system,f2: focal length of the second lens,t2: distance along the optical axis from the image-side surface of the second lens to the object-side surface of the third lens, andt3: distance along the optical axis from the image-side surface of the third lens to the object-side surface of the fourth lens.

There is provided a compact and high-resolution imaging lens at a low cost. The imaging lens comprises in order from an object side to an image side, a first lens having positive refractive power and a convex surface facing the object side near an optical axis, a second lens having negative refractive power and a meniscus shape having the convex surface facing the object side near the optical axis, a third lens having the positive or the negative refractive power, a fourth lens having the convex surface facing the image side near the optical axis, a fifth lens having the positive refractive power, a sixth lens having the positive refractive power, and a seventh lens having the negative refractive power and a concave surface facing the image side near the optical axis, the image side surface of said seventh lens is formed as an aspheric surface which changes to the convex surface at a peripheral area, the object-side surface of said fifth lens has the convex surface facing the object side near the optical axis, all lenses are single lenses arranged with an interval between lenses adjacent to each other, and below conditional expressions (1), (2) and (3) are satisfied:1.50<1<1.60  (1)−8.02/<−2.0  (2)0.3<2/3<3.3  (3)

There is provided a compact and high-resolution imaging lens at a low cost. The imaging lens comprises in order from an object side to an image side, a first lens having positive refractive power and a convex surface facing the object side near an optical axis, a second lens having negative refractive power and a meniscus shape having the convex surface facing the object side near the optical axis, a third lens having the positive or the negative refractive power, a fourth lens having the convex surface facing the image side near the optical axis, a fifth lens having the positive refractive power, a sixth lens having the positive refractive power, and a seventh lens having the negative refractive power and a concave surface facing the image side near the optical axis, the image side surface of said seventh lens is formed as an aspheric surface which changes to the convex surface at a peripheral area, the object-side surface of said fifth lens has the convex surface facing the object side near the optical axis, all lenses are single lenses arranged with an interval between lenses adjacent to each other, and below conditional expressions (1), (2) and (3) are satisfied:1.50<1<1.60  (1)−8.0<2/<−2.0  (2)0.3<2/3<3.3  (3)whereNd1: refractive index at d-ray of the first lens,f: focal length of the overall optical system,f2: focal length of the second lens,t2: distance along the optical axis from the image-side surface of the second lens to the object-side surface of the third lens, andt3: distance along the optical axis from the image-side surface of the third lens to the object-side surface of the fourth lens.

There is provided a compact and high-resolution imaging lens at a low cost. The imaging lens comprises in order from an object side to an image side, a first lens having positive refractive power and a convex surface facing the object side near an optical axis, a second lens having negative refractive power and a meniscus shape having the convex surface facing the object side near the optical axis, a third lens having the positive or the negative refractive power, a fourth lens having the convex surface facing the image side near the optical axis, a fifth lens having the positive refractive power, a sixth lens having the positive refractive power, and a seventh lens having the negative refractive power and a concave surface facing the image side near the optical axis, the image side surface of said seventh lens is formed as an aspheric surface which changes to the convex surface at a peripheral area, the object-side surface of said fifth lens has the convex surface facing the object side near the optical axis, all lenses are single lenses arranged with an interval between lenses adjacent to each other, and below conditional expressions (1), (2) and (3) are satisfied:1.50<1<1.6  (1)−8.0<2/<−2.0  (2)0.3<2/3<3.3  (3)whereNd1: refractive index at d-ray of the first lens,f: focal length of the overall optical system,f2: focal length of the second lens,t2: distance along the optical axis from the image-side surface of the second lens to the object-side surface of the third lens, andt3: distance along the optical axis from the image-side surface of the third lens to the object-side surface of the fourth lens.

There is provided a compact and high-resolution imaging lens at a low cost. The imaging lens comprises in order from an object side to an image side, a first lens having positive refractive power and a convex surface facing the object side near an optical axis, a second lens having negative refractive power and a meniscus shape having the convex surface facing the object side near the optical axis, a third lens having the positive or the negative refractive power, a fourth lens having the convex surface facing the image side near the optical axis, a fifth lens having the positive refractive power, a sixth lens having the positive refractive power, and a seventh lens having the negative refractive power and a concave surface facing the image side near the optical axis, the image side surface of said seventh lens is formed as an aspheric surface which changes to the convex surface at a peripheral area, the object-side surface of said fifth lens has the convex surface facing the object side near the optical axis, all lenses are single lenses arranged with an interval between lenses adjacent to each other, and below conditional expressions (1), (2) and (3) are satisfied:1.50&#x3c;1&#x3c;1.60&#x2003;&#x2003;(1)&#x2212;8.0&#x3c;2/&#x3c;&#x2212;2.0&#x2003;&#x2003;(2)0.3&#x3c;2/3&#x3c;3.3&#x2003;&#x2003;(3)where

There is provided an imaging lens with high-resolution which satisfies demand of the wide field of view, the low-profileness and the low F-number, and excellently corrects aberrations. An imaging lens comprises in order from an object side to an image side, a first lens having positive refractive power and a convex surface facing the object side near the optical axis, a second lens having negative refractive power near the optical axis, a third lens having the positive refractive power near the optical axis, a fourth lens, and a fifth lens having the negative refractive power and a concave surface facing the image side near the optical axis, wherein the image-side surface of said fifth lens is formed as an aspheric surface having at least one off-axial pole point, and predetermined conditional expressions are satisfied.

There is provided an imaging lens with high resolution which satisfies in well balance the low-profileness and the low F-number and properly corrects aberrations. An imaging lens comprises a first lens having positive refractive power, a second lens having the positive refractive power, a third lens, a fourth lens, a fifth lens being a double-sided aspheric lens, and a sixth lens being double-sided aspheric lens and having a concave surface facing the image side near the optical axis, wherein the image-side surface of the sixth lens is an aspheric surface changing to the convex surface at a peripheral area.

There is provided an imaging lens with excellent optical characteristics which satisfies demand of a low profile and a low F-number. An imaging lens comprises in order from an object side to an image side, a first lens with positive refractive power having a convex object-side surface in a paraxial region, a second lens with negative refractive power in a paraxial region, a third lens with negative refractive power in a paraxial region, a fourth lens with positive refractive power in a paraxial region, and a fifth lens with negative refractive power having a convex image-side surface in a paraxial region, and predetermined conditional expressions are satisfied.

An imaging lens which uses a larger number of constituent lenses for higher performance and features a low F-value, low-profile design and a wide field of view. Designed for a solid-state image sensor, the imaging lens includes constituent lenses arranged in order from an object side to an image side: a first positive refractive power lens; a second negative refractive power lens; a third lens; a fourth lens; a fifth lens; a sixth lens having a concave image-side surface near an optical axis; and a seventh negative refractive power lens.

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Sukagawa, Japan

Yukio Sekine