Abstract: There are provided a subminiature optical system having a miniature size and capable of obtaining a narrow view angle using only five sheets of lenses, and a portable device having the same. The subminiature optical system includes a first lens convex toward the object side and having positive refractive power, a second lens concave toward an image side and having negative refractive power, a third lens convex toward the object side and having positive refractive power, a fourth lens concave toward the image plane and having negative refractive power, and a fifth lens convex toward the image plane and having negative or positive refractive power, sequentially from an object side.

Abstract: An optical imaging system includes a first lens which has refractive power, a second lens which has refractive power, a third lens which has a convex object-side surface, and an inflection point is formed on an image-side surface thereof, a fourth lens which has refractive power, a fifth lens which has a convex object-side surface, and a sixth lens which has refractive power and an inflection point is formed on an image-side surface thereof, and wherein the first to sixth lens are sequentially disposed from an object side.

Abstract: An optical imaging system includes a first lens, a second lens, a third lens, a fourth lens, and a fifth lens. The first lens includes a convex object-side surface and a concave image-side surface. The second lens includes a concave object-side surface and a concave image-side surface. The third lens includes a concave object-side surface. The fourth lens includes a concave object-side surface. The fifth lens includes a concave object-side surface and a concave image-side surface. The first to fifth lenses are sequentially disposed from an object side toward an imaging plane.

Abstract: A camera module is provided. The camera module includes a first lens having a convex object-side surface; a second lens having a convex object-side surface; a third lens having positive refractive power; a fourth lens having a convex image-side surface; and a fifth lens having a refractive power, wherein the first to fifth lens are sequentially disposed from an object side toward an imaging plane, wherein a focal length of the second lens is within a range of ?10 mm to ?7.0 mm, and wherein 1.0<TTL/f<1.2, where TTL is a distance from the object-side surface of the first lens to the imaging plane and f is a focal length of the lens imaging system.

Abstract: An optical imaging system includes a first lens, a second lens, a third lens, a fourth lens, and a fifth lens sequentially disposed in ascending numerical order along an optical axis of the optical imaging system from an object side of the optical imaging system toward an imaging plane of the optical imaging system, wherein LfS2el/L1S1el?0.65 and 0.05<T1/TTL<0.1 are satisfied, where LfS2el is a maximum effective radius of an image-side surface of the fifth lens, L1S1el is a maximum effective radius of an object-side surface of the first lens, T1 is a thickness of the first lens along the optical axis, and TTL is a distance along the optical axis from the object-side surface of the first lens to the imaging plane.

Abstract: An optical imaging system includes a first lens, a second lens, a third lens, a fourth lens having negative refractive power, a fifth lens having positive refractive power, a sixth lens having a convex image-side surface, and a seventh lens, disposed sequentially from an object side. The optical imaging system satisfies ?5.0<f2/f<?2.0, where f is a focal length of the optical imaging system and f2 is a focal length of the second lens. An F No. of the optical imaging system is less than 1.7.

Abstract: An optical imaging system includes a first lens group having a first group of lenses. A foremost lens of the first group of lenses is a lens closest to an object side and has a positive refractive power. The optical imaging system also includes a second lens group having a second group of lenses. A rearmost lens of the second group of lenses is a lens closest to an imaging plane and has convex surfaces. The first and second lens groups are sequentially disposed from the object side to an imaging plane. An expression TL/f1<2.0 is satisfied, where TL represents a distance from an object-side surface of the foremost lens to the imaging plane and f1 represents a focal length of the foremost lens.

Abstract: An optical imaging system includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens sequentially disposed in numerical order along an optical axis of the optical imaging system from an object side of the optical imaging system toward an imaging plane of the optical imaging system; and a spacer disposed between the sixth and seventh lenses, wherein the optical imaging system satisfies 0.5<S6d/f<1.4, where S6d is an inner diameter of the spacer, f is an overall focal length of the optical imaging system, and S6d and f are expressed in a same unit of measurement.

Abstract: An optical imaging system includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens sequentially disposed in ascending numerical order along an optical axis of the optical imaging system from an object side of the optical imaging system toward an imaging surface of an image sensor, wherein f/f2+f/f3<?0.4 is satisfied, where f is a focal length of the optical imaging system, f2 is a focal length of the second lens, and f3 is a focal length of the third lens, and TTL/(2*IMG HT)<0.69 is satisfied, where TTL is a distance along the optical axis from an object-side surface of the first lens to the imaging surface of the image sensor, and IMG HT is one half of a diagonal length of the imaging surface of the image sensor.

Abstract: An optical imaging system includes a plurality of lenses disposed along an optical axis from an object side of the optical imaging system toward an imaging plane of the optical imaging system. The lenses are separated from each other by respective air gaps along the optical axis between the lenses. The lenses include a first lens closest to the object side of the optical imaging system. The conditional expressions 1.5 mm<Gmax, TL<12.0 mm, and 0.15<R1/f are satisfied, where Gmax is a maximum air gap along the optical axis among all of the air gaps, TL is a length of the optical imaging system along the optical axis from an object-side surface of the first lens to the imaging plane, R1 is a radius of curvature of the object-side surface of the first lens, and f is a focal length of the optical imaging system.

Abstract: An optical imaging system includes a first lens group including a reflective member and one or two lenses disposed in front of the reflective member; and a second lens group disposed behind the reflective member and including a plurality of lenses. The one or two lenses included in the first lens group have a positive refractive power overall, an image-side surface of a lens disposed closest to the reflective member among the one or two lenses included in the first lens group is concave, the reflective member includes an incident surface, a reflection surface, and an exit surface, and 0.25?D12P/DR?1.0 is satisfied, where D12P is a distance on an optical axis from the image-side surface of the lens disposed closest to the reflective member to the incident surface, and DR is a distance on the optical axis from the incident surface to the reflection surface.

Abstract: An optical imaging system is provided. The optical imaging system includes a first lens group including at least one lens disposed toward a first optical axis; a second lens group including at least one lens disposed in a second optical axis direction perpendicular to the first optical axis direction; and a prism disposed between the first lens group and the second lens group and configured to convert a path of incident light from the first optical axis direction to the second optical axis direction, wherein the conditional expression 0.200?D1/OAL2?0.500 is satisfied, wherein D1 is a maximum effective diameter of the first lens group, and OAL2 is a distance on a second optical axis from a reflective surface of the prism to an imaging plane.

Abstract: An optical imaging system includes first, second, third, fourth, fifth, and sixth lenses each having a refractive power. The first to sixth lenses are sequentially disposed in ascending numerical order along an optical axis of the optical imaging system from an object side of the optical imaging system toward an imaging plane of the optical imaging system, and are the only lenses having a refractive power in the optical imaging system. A radius of curvature of an object-side surface of the fourth lens at the optical axis is greater than a radius of curvature of an object-side surface of the second lens at the optical axis and a radius of curvature of an image-side surface of the second lens at the optical axis. A thickness of the third lens is greater than a distance from an image-side surface of the third lens to the object-side surface of the fourth lens.

Abstract: Proposed are a precursor for forming a lanthanide metal-containing thin film, the precursor being characterized by including a compound represented by Chemical Formula 1, a method for forming a lanthanide metal-containing thin film using the same, and a semiconductor element including the lanthanide metal-containing thin film. The precursor contains a lanthanide metal as the core metal atom and includes a cyclopentadienyl ligand providing properties such as a low melting point and high volatility, as well as a novel amidinate ligand that provides high structural stability, low viscosity, high volatility, high thermal stability, and properties such as being a liquid at room temperature or a solid with a low melting point. Therefore, the precursor exhibits physical properties suitable for use in a thin film formation process and thus can form a high-quality thin film.

Abstract: An optical imaging system includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens sequentially disposed in numerical order along an optical axis of the optical imaging system from an object side of the optical imaging system toward an imaging plane of the optical imaging system, wherein the optical imaging system satisfies 1<|f123457?f|/f, where f123457 is a composite focal length of the first to seventh lenses calculated with an index of refraction of the sixth lens set to 1.0, f is an overall focal length of the optical imaging system, and f123457 and f are expressed in a same unit of measurement.

Abstract: Proposed are a precursor for forming a scandium- or yttrium-containing thin film, the precursor being characterized by including a compound represented by Chemical Formula 1, a method for forming a scandium- or yttrium-containing thin film using the same, and a semiconductor device including the scandium- or yttrium-containing thin film. The precursor for forming the thin film contains an amidinate ligand and thus can exhibit chemical characteristics such as low viscosity, high heat resistance, and high volatility, thereby enabling the formation of a high-quality thin film.

Abstract: An organometallic compound represented by Formula 1: M1(L1)n1(L2)n2??Formula 1 wherein, M1 is a transition metal, L1 is a ligand represented by Formula 1A, L2 is a ligand represented by Formula 1B, and n1 and n2 are each independently 1 or 2, wherein X43 is C(R43), N, or C bonded to Y3; X44 is C(R44), N, or C bonded to Y2 or Y3; X45 is C(R45), N, or C bonded to Y2 or Y3; X46 is C(R46), N, or C bonded to Y2, wherein i) X43 is C bonded to Y3, and X44 is C bonded to Y2; ii) X44 is C bonded to Y3, and X45 is C bonded to Y2; or iii) X45 is C bonded to Y3, and X46 is C bonded to Y2, and the remaining substituents are as described herein.

Abstract: Proposed are a precursor for forming an yttrium- or scandium-containing thin film, the precursor being characterized by including a compound represented by Chemical Formula 1, a method for forming an yttrium- or scandium-containing thin film using the same, and a semiconductor element including the yttrium- or scandium-containing thin film. The precursor contains yttrium or scandium as the core metal atom and includes a cyclopentadienyl ligand providing characteristics such as low melting point and high volatility, as well as a novel amidinate ligand that provides properties such as high structural stability, low viscosity, high volatility, high thermal stability, and being a liquid at room temperature or being a solid having a low melting point. Therefore, the precursor exhibits physical properties suitable for use in a thin film formation process and thus can form a high-quality thin film.

Abstract: An optical imaging system includes a first lens having an object-side surface that is convex; a second lens having a refractive power; a third lens having a refractive power; a fourth lens having a refractive power; a fifth lens having a refractive power and an object-side surface that is concave; and a sixth lens having a refractive power and an object-side surface that is concave, wherein the first lens through the sixth lens are sequentially disposed in numerical order from an object side of the optical imaging system toward an imaging plane, and the optical imaging system satisfies the conditional expressions 0.7<TL/f<1.0 and TL/2<f1, where TL is a distance from the object-side surface of the first lens to the imaging plane, f is an overall focal length of the optical imaging system, and f1 is a focal length of the first lens.

Abstract: An optical imaging system includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens sequentially disposed in numerical order along an optical axis of the optical imaging system from an object side of the optical imaging system toward an imaging plane of the optical imaging system, wherein the first to seventh lenses are spaced apart from each other along the optical axis, and the optical imaging system satisfies 0.4<L1TR/L7TR<1.9, where L1TR is an overall outer diameter of the first lens, L7TR is an overall outer diameter of the seventh lens, and L1TR and L7TR are expressed in a same unit of measurement.