Sekonix Co., Ltd.

Seong Jun Bae

Soon Cheol Choi

Ki Youn Noh

Su Jeong Kim

Sung Nyun Kim

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.

Growing community of inventors

Gyeonggi-do, South Korea

Seong Jun Bae