Abstract: An optical lens assembly includes, in order from the object side to the image side: a stop, a first lens, a second lens, a third lens, and an IR band-pass filter, wherein half of a maximum view angle (field of view) of the optical lens assembly is HFOV, a radius of curvature of an image-side surface of the third lens is R6, a focal length of the optical lens assembly is f, and following condition is satisfied: ?6.83<HFOV/(R6/f)<44.10, which is favorable to the thinning and large field of view of the lens assembly.

Abstract: A five-piece optical lens system with a wide field of view includes, in order from the object side to the image side: a first lens element with a negative refractive power, a stop, a second lens element with a positive refractive power, a third lens element with a negative refractive power, a fourth lens element with a positive refractive power, a fifth lens element with a negative refractive power, wherein a central thickness of the first lens element along an optical axis is CT1, a central thickness of the third lens element along the optical axis is CT3, a central thickness of the fourth lens element along the optical axis is CT4, a central thickness of the fifth lens element along the optical axis is CT5, satisfying the relations: 0.69<CT4/(CT1+CT3+CT5)<1.32, 1.83<(CT1+CT5)/CT3<4.06. Such a system has a wide field of view, high resolution, short length, less distortion taking into account lens production.

Abstract: An optical lens assembly includes, in order from the object side to the image side: a stop, a first lens with positive refractive power, a second lens with negative refractive power, a third lens with positive refractive power, a fourth lens with positive refractive power, and a fifth lens with negative refractive power, wherein half of a maximum view angle (field of view) of the optical lens assembly is HFOV, a radius of curvature of an object-side surface of the fifth lens is R9, a focal length of the optical lens assembly is f, and following condition is satisfied: ?79.81<HFOV*R9/f<?38.47.

Abstract: An infrared projection lens assembly includes, in order from the image side to the image source side: a stop, a first lens with positive refractive power, a second lens with refractive power, and a third lens with positive refractive power, wherein a radius of curvature of an image-side surface of the first lens is R1, half of a maximum view angle (field of view) of the infrared projection lens assembly is HFOV, a focal length of the infrared projection lens assembly is f, and following condition is satisfied: ?18.2<R1/(sin(HFOV)*f)<?1.53, so as to provide projected light of large angle.

Abstract: An optical lens assembly includes, in order from the object side to the image side: a stop, a first lens, a second lens, a third lens, and an IR band-pass filter, wherein half of a maximum view angle (field of view) of the optical lens assembly is HFOV, a radius of curvature of an image-side surface of the third lens is R6, a focal length of the optical lens assembly is f, and following condition is satisfied: ?6.83<HFOV/(R6/f)<44.10, which is favorable to the thinning and large field of view of the lens assembly.

Abstract: A four-piece dual waveband optical lens system includes, in order from the object side to the image side: a stop; a first lens element with a positive refractive power having an object-side surface being convex near an optical axis, an image-side surface being convex near the optical axis; a second lens element with a negative refractive power having an object-side surface being concave near the optical axis, an image-side surface being convex near the optical axis; a third lens element with a positive refractive power having an object-side surface being concave near the optical axis, an image-side surface being convex near the optical axis; a fourth lens element with a negative refractive power having an object-side surface being convex near the optical axis, an image-side surface being concave near the optical axis, which has a short length and good performance without re-focusing in visible light and infrared dual waveband.

Abstract: A seven-piece optical lens system includes, in order from the object side to the image side: a stop; a first lens element with a positive refractive power; a second lens element with a negative refractive power; a third lens element with a refractive power, a fourth lens element with a positive refractive power; a fifth lens element with a refractive power; a sixth lens element with a positive refractive power; and a seventh lens element with a negative refractive power. Such arrangements can provide a miniaturized seven-piece optical lens system having a big stop and high image quality.

Abstract: A seven-piece optical lens system, in order from the object side to the image side: a first lens element with a positive refractive power; a second lens element with a negative refractive power; a third lens element with a refractive power, a fourth lens element with a refractive power; a fifth lens element with a positive refractive power; a sixth lens element with a refractive power; and a seventh lens element with a negative refractive power. Such arrangements can provide a miniaturized seven-piece optical lens system having a big stop and high image quality.

Abstract: A six-piece optical lens system with a wide field of view includes, in order from the object side to the image side: a first lens element with a negative refractive power, a stop, a second lens element with a positive refractive power, a third lens element with a negative refractive power, a fourth lens element with a positive refractive power, a fifth lens element with a positive refractive power, and a sixth lens element with a negative refractive power, wherein central thicknesses of the first, third, fourth, fifth and sixth lens elements along the optical axis are CT1,CT3,CT4,CT5,CT6, respectively, satisfying the relations: 2.07<(CT1+CT6)/CT3<5.52; 0.82<(CT4+CT5)/(CT1+CT3+CT6)<1.96. Such arrangements can provide a six-piece optical lens system which has a wide field of view, high resolution, short length and less distortion taking into account lens production.

Abstract: A five-piece optical lens system with a wide field of view includes, in order from the object side to the image side: a first lens element with a negative refractive power, a stop, a second lens element with a positive refractive power, a third lens element with a negative refractive power, a fourth lens element with a positive refractive power, a fifth lens element with a negative refractive power, wherein a central thickness of the first lens element along an optical axis is CT1, a central thickness of the third lens element along the optical axis is CT3, a central thickness of the fourth lens element along the optical axis is CT4, a central thickness of the fifth lens element along the optical axis is CT5, satisfying the relations: 0.69<CT4/(CT1+CT3+CT5)<1.32, 1.83<(CT1+CT5)/CT3<4.06. Such a system has a wide field of view, high resolution, short length, less distortion taking into account lens production.

Abstract: A four-piece dual waveband optical lens system includes, in order from the object side to the image side: a stop; a first lens element with a positive refractive power having an object-side surface being convex near an optical axis, an image-side surface being convex near the optical axis; a second lens element with a negative refractive power having an object-side surface being concave near the optical axis, an image-side surface being convex near the optical axis; a third lens element with a positive refractive power having an object-side surface being concave near the optical axis, an image-side surface being convex near the optical axis; a fourth lens element with a negative refractive power having an object-side surface being convex near the optical axis, an image-side surface being concave near the optical axis, which has a short length and good performance without re-focusing in visible light and infrared dual waveband.

Abstract: A four-piece infrared single wavelength lens system, in order from an object side to an image side, includes: an aperture stop; a first lens element with a positive refractive power having an object-side surface being convex and an image-side surface being concave near the optical axis; a second lens element with a positive refractive power having an object-side surface being concave and an image-side surface being convex near the optical axis; a third lens element with a refractive power having an object-side surface being concave and an image-side surface being convex near the optical axis; and a fourth lens element with a refractive power having an object-side surface being convex and an image-side surface being concave near the optical axis, and at least one inflection point being formed on one of the object-side surface and the image-side surface of the fourth lens element.

Abstract: A four-piece infrared single wavelength lens system includes, in order from the object side to the image side: a first lens element with a positive refractive power, a stop, a second lens element with a refractive power, a third lens element with a positive refractive power, and a fourth lens element with a negative refractive power. The focal length of the first lens element is f1, the focal length of the second lens element and the third lens element combined is f23, and they satisfy the relation: 0.05<f1/f23<1.8. When the above relation is satisfied, a wide field of view can be obtained and the resolution can be improved evidently.

Abstract: A three-piece infrared single wavelength lens system includes, in order from the object side to the image side: a stop, a first lens element with a positive refractive power, a second lens element with a positive refractive power, and a third lens element with a positive refractive power. The focal length of the first lens element is f1, the focal length of the second lens element and the third lens element combined is f23, and they satisfy the relation: 0.5<f1/f23<1.0. When the above relation is satisfied, a wide field of view can be obtained and the resolution can be improved evidently.

Abstract: A four-piece infrared single wavelength lens system, in order from an object side to an image side, includes: an aperture stop; a first lens element with a positive refractive power having an object-side surface being convex and an image-side surface being concave near the optical axis; a second lens element with a positive refractive power having an object-side surface being concave and an image-side surface being convex near the optical axis; a third lens element with a refractive power having an object-side surface being concave and an image-side surface being convex near the optical axis; and a fourth lens element with a refractive power having an object-side surface being convex and an image-side surface being concave near the optical axis, and at least one inflection point being formed on one of the object-side surface and the image-side surface of the fourth lens element.

Abstract: An optical lens system with a wide field of view includes, in order from the object side to the image side: a stop, a first lens element with a negative refractive power, a second lens element with a positive refractive power, a third lens element with a negative refractive power, a fourth lens element with a positive refractive power, and a fifth lens element with a negative refractive power. Such arrangements can provide a five-piece optical lens system which has a wide field of view, high resolution, short length and less distortion.

Abstract: A four-piece infrared single wavelength lens system includes, in order from the object side to the image side: a first lens element with a refractive power, a stop, a second lens element with a positive refractive power, a third lens element with a positive refractive power, and a fourth lens element with a positive refractive power. The focal length of the first lens element is f1, the focal length of the second lens element and the third lens element combined is f23, and they satisfy the relation: ?210<f1/f23<365. When the above relation is satisfied, a wide field of view can be obtained and the resolution can be improved evidently.

Abstract: A four-piece infrared single wavelength lens system includes, in order from the object side to the image side: a first lens element with a refractive power, a stop, a second lens element with a positive refractive power, a third lens element with a positive refractive power, and a fourth lens element with a positive refractive power. The focal length of the first lens element is f1, the focal length of the second lens element and the third lens element combined is f23, and they satisfy the relation: ?210<f1/f23<365. When the above relation is satisfied, a wide field of view can be obtained and the resolution can be improved evidently.

Abstract: A three-piece infrared single wavelength lens system includes, in order from the object side to the image side: a stop, a first lens element with a positive refractive power, a second lens element with a positive refractive power, and a third lens element with a positive refractive power. The focal length of the first lens element is f1, the focal length of the second lens element and the third lens element combined is f23, and they satisfy the relation: 0.5<f1/f23<1.0. When the above relation is satisfied, a wide field of view can be obtained and the resolution can be improved evidently.

Abstract: A four-piece infrared single wavelength lens system includes, in order from the object side to the image side: a first lens element with a positive refractive power, a stop, a second lens element with a refractive power, a third lens element with a positive refractive power, and a fourth lens element with a negative refractive power. The focal length of the first lens element is f1, the focal length of the second lens element and the third lens element combined is f23, and they satisfy the relation: 0.05<f1/f23<1.8. When the above relation is satisfied, a wide field of view can be obtained and the resolution can be improved evidently.