Sekonix Co., Ltd.

Ki Youn Noh

Soon Cheol Choi

Seong Jun Bae

Sung Nyun Kim

Su Jeong Kim

Seung Nam Nam

Seung Wook Nam

Soon Chul Choi

Chae Yeong Kim

A small lens system for developing a close tolerance is proposed. The small lens system includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens that are arranged in order along an optical axis from an object. Refractive power P1 of the first lens satisfies −0.01 mm<P1<0.01 mm, the second lens is shaped with opposite convex surfaces, and refractive power P2 of the second lens satisfies P2>0.4 mm, the third lens has negative refractive power, and a rear surface curvature C6 of the third lens satisfies −0.01 mm<C6<0.01 mm, refractive power P4 of the fourth lens satisfies −0.1 mm<P4<0.1 mm, refractive power P5 of the fifth lens satisfies P5>0.7 mm, and refractive power P6 of the sixth lens satisfies P6<−0.7 mm.

Small lens system for developing close tolerance

Disclosed is a small wide-angle lens system including a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, and a ninth lens sequentially arranged from an object, wherein the first lens has a convex object-side surface, the third lens has a negative refractive power, the fourth lens has a concave image-side surface, the sixth lens has a concave object-side surface and a concave image-side surface, the ninth lens has a negative refractive power and a concave object-side surface, all surfaces of the first to ninth lenses are aspherical surfaces, the refractive power P1 of the first lens satisfies |P1|<0.01, and Fno of the lens system satisfies Fno<1.6.

Small wide-angle lens system

Disclosed is a small lens system including a first lens, a second lens, a third lens, and a fourth lens sequentially arranged from an object along an optical axis, wherein the thickness (ct) of the first lens, the thickness (ct) of the second lens, the thickness (ct) of the third lens, and the thickness (ct) of the fourth lens satisfy ct+ct>ct+ct, ct>ct, ct>ct, and ct>ct, the front surface of the first lens is convex toward the object while the sagittal amount of the first lens is increased depending on the height thereof, the refractive power (P) of the second lens satisfies −0.01 mm<P<0.01 mm, the front curvature (C) and the rear curvature (C) of the second lens satisfy |C|<0.1 mmand |C|<0.1 mm, and the f-number of the lens system is less than 1.4.

Small lens system for TOF

Disclosed is a small lens system including a first lens, a second lens, and a third lens sequentially arranged from an object along an optical axis, wherein the thickness (ct) of the first lens, the thickness (ct) of the second lens, and the thickness (ct) of the third lens satisfy ct/ct>1.5 and ct/(ct+ct)>0.8, the refractive power (P) of the second lens satisfies −0.01<P<0.01, the lens thickness (et) at a predetermined height and the center thickness (ct) of the second lens thereof satisfy |et−ct|<5 μm up to 30% of the height of the rear effective diameter thereof and satisfy et−ct<−20 μm at 70% of the height of the rear effective diameter thereof, and the f-number of the lens system is less than 1.7.

Disclosed is a small lens system including a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens, wherein the first lens has a lens surface convex toward an object, the second lens has a lens surface convex toward the object, the third lens has a lens surface convex toward the object, the fourth lens has a positive refractive power, the fifth lens has a negative refractive power, the sixth lens has a lens surface convex toward an image, the seventh lens has a positive refractive power and is configured such that a lens surface is convex toward the object in the vicinity of an optical axis, and the eighth lens has a negative refractive power and is configured such that an object-side surface and an image-side surface are concave in the vicinity of the optical axis.

Small lens system including eight lenses of &#x2212;+&#x2212;+&#x2212;++&#x2212; refractive powers

Disclosed is a small lens system including a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens sequentially arranged from an object, wherein the first lens has a positive refractive power, the second lens has a negative refractive power, the third lens has a positive refractive power, the fourth lens has a negative refractive power, the fifth lens is convex toward the object, is concave toward an image, and has a positive refractive power, the sixth lens has a positive or negative refractive power and is provided with at least one inflection point, and the seventh lens has a positive or negative refractive power and is configured such that the radii of curvature R71 and R72 of the object-side surface and image-side surface of the seventh lens satisfy R71=&#x221e; and R72=&#x221e;, respectively.

Small lens system including seven lenses of +-+-+-0 refractive powers on the optical axis

Disclosed is a small lens system including a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens sequentially arranged from an object, wherein the first lens has a convex surface facing the object, the second lens has a convex surface facing the object and a positive refractive power, the third lens has a positive or negative refractive power, the fourth lens has opposite surfaces convex toward an image, the fifth lens has opposite surfaces convex toward the image, the sixth lens has at least one aspherical surface and is configured such that the object-side surface of the sixth lens is convex in the vicinity of an optical axis, and the seventh lens has at least one aspherical surface and is configured such that at least one inflection point is provided on the aspherical surface of the seventh lens.

Small lens system including seven lenses of ++&#x2212;+++&#x2212; or &#x2212;+&#x2212;+++&#x2212; refractive powers

The present invention relates to a high-resolution wide angle lens system consisting of a total of six lens, wherein the first lens has a negative refractive power, the second lens has a positive refractive power, the third lens has a positive or negative refractive power, the fourth lens has a positive or negative refractive power, the fifth lens has a positive or negative refractive power with a concave shape on an object side and a convex shape on an image side, and the sixth lens has a positive or negative refractive power, and the system is satisfied with 0&#x3c;|f/f5|&#x3c;1 (herein, f represents an effective focal length of the entire lens system, and f5 represents an effective focal length of the fifth lens).

High-resolution wide angle lens system

A small wide-angle lens system having six lenses is proposed. In the lens systems, a first lens is biconvex toward a focal object, with center thickness (Tc) and thickness (Te) of the outermost effective diameter satisfying 1.1&#x3c;Tc/Te&#x3c;1.5, and a refractive power (P1) satisfying &#x2212;0.06&#x3c;P1&#x3c;0.06. A second lens has a positive refractive power, a front surface convex toward the focal object, and a radius of curvature (R4) of the rear surface satisfying 10&#x3c;|R4|. A third lens has a negative refractive power, a rear surface concave toward an image and a radius of curvature (R5) of the front surface satisfying 10&#x3c;|R5|. A distance interval (T12) in an effective diameter of the first and second lenses satisfies T12&#x3c;0.2 mm, and a distance interval (T23) within an effective diameter of the second and third lenses satisfies T23&#x3c;0.1 mm.

Small wide-angle lens system having six lenses of &#x2212;+&#x2212;++&#x2212; or ++&#x2212;++&#x2212; refractive powers

A small lens system having five lenses arranged along an optical axis from a focal object side in order of a first, a second, a third, a fourth, and a fifth lens is proposed. A center interval (T) of the first and the second lens is T&#x3c;0.2 mm, and an effective outermost interval (T) satisfies T&#x3c;0.2 mm. The fifth lens has a positive refractive power, a front surface convex toward the focal object, a rear curvature (C10) satisfying &#x2212;0.01&#x3c;C10&#x3c;0.01, and the periphery of a rear surface convex upwards. A center interval (T) of the fourth and the fifth lens is T&#x3c;0.1 mm and an effective outermost distance (T45e) thereof satisfies T45e&#x3e;0.35 mm. Thicknesses of each lens from the first to the fifth lens and a distance (TL) from the front to the rear surface of the lens system satisfy (ct1+ct2+ct3+ct4+ct5)/TL&#x3c;0.47.

Small lens system comprising five lenses of +&#x2014;+ refractive powers

A telephoto lens system having a plurality of lenses toward a focal object is proposed. The system includes a first lens with a positive refractive power, a second lens with a negative refractive power, a third lens with a negative refractive power, a fourth lens with a negative refractive power, and a fifth lens with a positive refractive power. A refractor bending an optical axis is provided between the second lens and the third lens. The angle (A) between the optical axes of the second lens and the third lens satisfies 80&#xb0;&#x2264;A&#x2264;86&#xb0;. A barrel surrounding the first lens is provided by protruding more toward the focal object than the first lens. The inner diameter of the barrel is smaller than or equal to the effective diameter of the first lens, and a stop is arranged toward the focal object of the first lens.

Telephoto lens system

A wide-angle photographic lens system enabling correction of distortion composed of four lenses, in which a first lens, an iris, a second lens, a third lens and a fourth lens sequentially arranged along an optical axis from an object, wherein the first lens has weak refractivity, the second lens has positive refractivity, the third lens has strong positive refractivity, and the fourth lens has negative refractivity, wherein the lens system satisfies relations, |f1/f|&#x3e;4, f3/f&#x3c;1.5, and te/tc&#x3c;0.5, wherein f1 is a focal length of the first lens, f is a total focal length of all the lenses, f3 is a focal length of the third lens, to is a lens thickness on an effective diameter of a rear surface of the third lens, and tc is a center thickness of the third lens.

Wide-angle photographic lens system enabling correction of distortion

A photographic lens system enabling reduction in tightness of manufacturing tolerance of lenses, which has five lenses: a first lens, a second lens, a third lens, a fourth lens and a fifth lens sequentially arranged along an optical axis from an object, wherein the first lens has strong positive refractivity, the second lens is a meniscus type lens and has weak positive refractivity, the third lens has upward convex-shaped positive refractivity, the fourth lens has upward convex-shaped negative refractivity, and the fifth lens has negative refractivity, wherein the lens system satisfies a relation, f2/f1&#x3e;10, wherein f1 is a focal distance of the first lens, and f2 is a focal distance of the second lens.

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Gyeonggi-do, South Korea

Ki Youn Noh