An optical lens includes a first lens, a second lens, a third lens, a fourth lens and a fifth lens arranged in order from a magnified side to a minified side. A sum of refractive powers of the first lens and the second lens is negative, and a sum of refractive powers of the third lens, the fourth lens and the fifth lens is positive. The first lens is a glass lens with a negative refractive power, the second lens is a plastic lens, and the third lens, the fourth lens and the fifth lens are composed of one glass lens with an Abbe number of larger than 60 and two plastic lenses.

A lens assembly includes a first lens group, a second lens group and an aperture. The first lens group includes two lenses with refractive power. The second lens group with a positive refractive power includes at least two lenses with refractive power. The aperture is disposed between the first lens group and the second lens group. The lens assembly includes 5 to 8 lenses with refractive power. D1 is the diameter of the lens surface of the first lens group farthest from the second lens group. LT is the length on the optical axis of the lens from the lens surface farthest from the imaging plane of the lens assembly to the lens surface closest to the imaging plane of the lens assembly. IMH is the maximum imaging height of lens assembly on the imaging plane, wherein the lens assembly satisfies conditions: 3.5<LT/IMH<6, 0.65<D1/LT<0.98.

An imaging device includes: a sensor to detect a first target spectrum, the first target spectrum corresponding to a thermal imaging region of an infrared (IR) spectrum; and an optical device to transmit external light to the sensor, the optical device including: a substrate; and a plurality of nanostructures on the substrate, and to collimate at least the first target spectrum in the external light on the sensor. The plurality of nanostructures are spaced apart from each other, and at least one of the plurality of nanostructures has a different geometric size from that of another.

An optical imaging system includes five lens elements, the five lens elements being, in order from an object side to an image side: a first lens element having positive refractive power; a second lens element having negative refractive power; a third lens element having positive refractive power; a fourth lens element having positive refractive power; and a fifth lens element having negative refractive power.

An imaging device includes: a sensor to detect a first target spectrum, the first target spectrum corresponding to a thermal imaging region of an infrared (IR) spectrum; and an optical device to transmit external light to the sensor, the optical device including: a substrate; and a plurality of nanostructures on the substrate, and to collimate at least the first target spectrum in the external light on the sensor. The plurality of nanostructures are spaced apart from each other, and at least one of the plurality of nanostructures has a different geometric size from that of another.

An optical filter may include a monolithic substrate. The optical filter may include a first component filter disposed onto a first region of the monolithic substrate. The first component filter may be a near infrared (NIR) bandpass filter. The optical filter may include a second component filter disposed onto a second region of the monolithic substrate. The second component filter may include a red-green-blue (RGB) bandpass filter. A separation between the first component filter and the second component filter may be less than approximately 50 micrometers (μm).

An imaging module comprises: a single-pupil head component with hyper-hemispherical entrance field with refractive entrance surface, concave exit face, a refractive central zone and reflective peripheral zone, and comprising a secondary mirror, an aberrations corrector which comprises an aspherical lens, a focusing objective, an aperture diaphragm between the aberrations corrector and the objective. The head component is quasi-afocal in the vicinity of the field of 90° angular radius, its entrance surface has a ½ vertex angle of smaller than 30°, the secondary mirror is aspherical with variable local focal length with a maximum local power for a zone used by a field of 90° angular radius and minimum smaller by at least a factor of 2 for a zone used by a field of angular radius smaller than 20°.

A system for computational imaging spectroscopy to provide compact and lightweight design, as well as large field of view of an object to be captured. The system includes imaging components, and computational device. The imaging components includes lens assembly, a fixed or variable-diameter aperture, spectral filter array and imaging sensor. The lens assembly provides wide angle of view, image-side telecentricity, and further may correct for longitudinal chromatic aberrations. The lens assembly may not provide correction of lateral chromatic aberrations. Furthermore, the lens assembly provides image-space telecentricity so as to chief rays are incident perpendicular to image sensor. The lens assembly may produce different chromatic aberrations pattern for each wavelength within the spectral range of interest. The pass-band nanofilter array is configured to filter a plurality of specific bands of light reflected from the imaged object and further produces a plurality of spatio-spectral samples of the imaged object projected onto the photosensitive pixels of imaging sensor. The computational device reconstructs complete spectral cube within the spectral range of interest, and further enables the computation of object reflectance at each pixel of the captured image from the plurality of spatio-spectral samples registered by the imaging sensor.

A disclosed imaging device may include an image sensor, a lens system, and an aperture filter. The aperture filter may include a first concentric region that passes light of a first wavelength range and that blocks light of a second wavelength range and a second concentric region that passes light of the first wavelength range and light of the second wavelength range. The lens system may direct received light through the aperture filter toward the image sensor. The lens system and the aperture filter may provide a first depth-of-field associated with the first wavelength range and a second depth-of-field associated with the second wavelength range. Associated systems and methods are also disclosed.

The application discloses an optical imaging lens. The optical imaging lens sequentially includes from an object side to an image side along an optical axis: a first lens having a focal power; a diaphragm; a second lens having a focal power; a third lens having a focal power, and provided with an object-side surface and an image-side surface, the object-side surface is convex surface, the image-side surface is a concave surface; a fourth lens having a positive focal power, and provided with an object-side surface and an image-side surface, the object-side surface is a concave surface, the image-side surface is a convex surface; and a fifth lens having a negative focal power; at least one aspherical mirror surface is included in an object-side surface of the first lens to an image-side surface of the fifth lens; the optical imaging lens meets the following relational expressions: f/EPD<1.5, and 2 mm<ImgH*EPD/f<3 mm.