The present disclosure discloses an optical imaging lens group including, sequentially from an object side to an image side along an optical axis, a first lens having positive refractive power with a convex object-side surface; a second lens having refractive power; a third lens having refractive power; a fourth lens having refractive power; a fifth lens having refractive power; and a sixth lens having negative refractive power with a concave object-side surface and a convex image-side surface. A total effective focal length f of the optical imaging lens group, an entrance pupil diameter EPD of the optical imaging lens group and half of a maximal field-of-view Semi-FOV of the optical imaging lens group satisfy: f/EPD<2, and f*tan(Semi-FOV)>4.5 mm.

The present disclosure relates to the field of optical lenses and provides a camera optical lens sequentially including, from an object side to an image side, first to sixth lenses. The camera optical lens satisfies following conditions: 3.00≤(d1+d2)/d3≤4.00; 1.50≤(d9+d10)/d11≤3.00; and −5.00≤R9/R11≤−4.60, where d1, d3, d9 and d11 denotes on-axis thicknesses of the first, second, fifth and sixth lenses, respectively; d2 denotes an on-axis distance from an image side surface of the first lens to an object side surface of the second lens; d10 denotes an on-axis distance from an image side surface of the fifth lens to an object side surface of the sixth lens; and R9 and R11 denote curvature radiuses of object side surfaces of the fifth and sixth lenses, respectively. The camera optical lens according to the present disclosure can achieve high optical performance while satisfying design requirements for ultra-thin, wide-angle lenses having large apertures.

The present invention discloses a camera optical lens including, from an object side to an image side in sequence a first lens having a positive refractive power, a second lens having a negative refractive power, a third lens having a refractive power, a fourth lens having a positive refractive power, and a fifth lens having a negative refractive power. The camera optical lens satisfies the following conditions: 0.70≤f1/f≤1.00, 3.00≤R3/R4≤15.00, 2.00≤R6/R5≤10.00, −12.00≤R7/R8≤−1.50, and −15.00≤R9/R10≤−3.00. The camera optical lens according to the present invention has excellent optical characteristics, such as large aperture, wide angle, and ultra-thin.

An athermal and achromatic lens with a high resolution while further being near orthoscopic and providing a large field of view. Further, the provided VNIR lens may utilize only three types of optical glass allowing the lens to be reduced in size, cost, and weight while further reducing or minimizing the complexity thereof.

An imaging lens assembly includes an imaging lens element assembly, and an optical axis passes through the imaging lens assembly. The imaging lens element assembly includes a plurality of lens elements, and the lens elements includes a first lens element and a second lens element, wherein a refractive index of the first lens element is different from a refractive index of the second lens element. Each of the first lens element and the second lens element includes at least one nanostructure layer and at least one structure connection film. The nanostructure layer is irregularly arranged, the nanostructure layer includes an alumina crystal. The structure connection film is disposed between a surface of the first lens element and the nanostructure layer and between a surface of the second lens element and the nanostructure layer.

A four-piece infrared 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, a fourth lens element with a negative refractive power, wherein a focal length of the first lens element and the second lens element combined is f12, a focal length of the third lens element and the fourth lens element combined is f34, and they satisfy the relation: 0.2<f12/f34<1.4. Such a system has a wide field of view, large stop, short length and less distortion.

A method for designing a freeform concave grating imaging spectrometer includes selecting a series of light rays incident from different positions of a slit as characteristic light rays. The coordinates and normal directions of characteristic data points at intersections of the characteristic light rays and a surface of a freeform concave grating are calculated. A freeform surface shape of the freeform concave grating is obtained by fitting, so that an initial structure is obtained. Then the initial structure is optimized.

An imaging lens assembly includes seven lens elements which are, in order from an object side to an image side along an optical path: a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element and a seventh lens element. Each of the seven lens elements has an object-side surface facing toward the object side and an image-side surface facing toward the image side. The second lens element has positive refractive power. The sixth lens element has positive refractive power, and the image-side surface of the sixth lens element is convex in a paraxial region thereof. The seventh lens element has negative refractive power. At least one of the object-side surface and the image-side surface of at least one lens element of the imaging lens assembly is aspheric and has at least one inflection point.

An optical system, a lens module, and an electronic device are provided. The optical system includes in order from an object side to an image side a first lens to a fifth lens with refractive powers, where the first lens and a fourth lens have positive refractive powers. Object-side surfaces of the first and fifth lenses are convex near the optical axis. The object-side surfaces of the first and fifth lenses and image-side surfaces of the first, third, and fourth lenses are convex near peripheries. Image-side surfaces of the first and fifth lenses are concave near the optical axis. Object-side surfaces of the second, third, fourth, and fifth lenses are concave near peripheries.

Provided is an optical system, sequentially comprising, from an object side to an image side, a first lens having negative refractive power, an object side face of the first lens being convex, and an image side face being concave; a second lens having negative refractive power, an image side face of the second lens being concave; a third lens having positive refractive power, an object side face and an image side face of the third lens each being convex; a fourth lens having positive refractive power, an object side face and an image side face of the fourth lens each being convex; a lens unit having refractive power; and a stop arranged on an object side of the fourth lens. The optical system satisfies the condition of FOV/CRA>10.