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, 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.

An optical imaging system includes a first lens, as second lens, a third lens, a fourth lens, and a fifth lens. The first lens includes a positive refractive power and a convex image-side surface. The second lens includes a positive refractive power, and the third lens includes a negative refractive power. The fourth lens includes a positive refractive power, and the fifth lens includes a positive refractive power. The first to fifth lenses are sequentially disposed from an object side toward an imaging plane.

According to an embodiment of the disclosure, an electronic device includes a light source unit to emit infrared light having a specified wavelength band, a camera module, a memory, and a processor, the camera module includes a lens assembly including a first lens having a property to at least partially absorb visible light and one or more second lenses to refract light, which is output through the first lens, at a specified angle, a filter to pass through light, which has the specified wavelength band, of the light output through the lens assembly, and an image sensor to sense light, which is output through the lens assembly and the filter, to obtain an image, and the processor is configured to receive an input of a user to photograph an external object, emit the infrared light using the light source unit based on the input of the user, and obtain, using the camera module, an image corresponding to light, which is reflected from the external object, of the emitted infrared light.

The current invention describes a compact objective lens with enhanced distortion for near-infrared imaging, comprising a positively powered, aspheric, and meniscus first lens element; a negatively powered, aspheric, and meniscus second lens element; a positively powered, aspheric, and biconvex third lens element; a negatively powered, aspheric, and meniscus fourth lens element; a negatively powered, aspheric, and meniscus field corrector element; and a detector assembly comprising a window and a detector plane where the light rays come to focus.

An image relay system is presented that includes an opposing pair of rod lens assemblies positioned symmetrically with respect to a central airspace. The rod lens assemblies include a meniscus lens positioned immediately adjacent to a central airspace and with the convex surface facing the airspace, a first lens having positive optical power with a convex face positioned adjacent to the inner face of the meniscus lens, a rod lens adjacent to the first lens having positive power, and a second lens having positive optical power positioned adjacent to the rod lens, the relay system designed so that light across a broad spectrum come to a common focus, as well as correcting for spherical aberration across the broad spectrum. An endoscope employing this relay system is also presented.

A five-piece infrared single wavelength lens system 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, and a fifth lens element with a negative refractive power, where a radius of curvature of an object-side surface of the third lens element is R5, a central thickness of the third lens element along an optical axis is CT3, and they satisfy the relation: 5<R5/CT3<35. Such a system has a wide field of view, large stop, short length and less distortion.

An optical lens assembly includes at least one optical element. At least one of the at least one optical element includes a multi-layer coating membrane, and the multi-layer coating membrane is formed by alternately stacking high refractive index layers and low refractive index layers. The multi-layer coating membrane is a dual-bandpass filtering membrane.

An optical image capturing system includes, along the optical axis in order from an object side to an image side, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens. At least one lens among the first to the sixth lenses has positive refractive power. The seventh lens has negative refractive power, wherein both surfaces thereof are aspheric, and at least one surface thereof has an inflection point. The lenses in the optical image capturing system which have refractive power include the first to the seventh lenses. The optical image capturing system can increase aperture value and improve the imaging quality for use in compact cameras.

A high magnification MWIR continuous zoom optical system is described herein that consists of the following components: a front detachable extender group, a fixed group for focusing incoming radiation, three moving groups for zooming and generating an intermediate image and a relay group. The mentioned optical system has the ability to work with MWIR radiation (3-5 μm) and generate a thermal image from the gathered radiation. The system also has the ability to zoom continuously in a wide variable focal length range with a high magnification ratio of 20×. With the use of a cooled detector, the combined system allows its user to be able to receive high quality thermal images in all FOV configurations.

The disclosure discloses a large-aperture infrared metalens camera, which belongs to the technical field of infrared imaging and micro-nano photonics, including a large-aperture metalens, an infrared focal plane array detector, a metalens mechanical assembly and a housing. The large-aperture metalens has an aperture greater than 50 mm and a thickness less than 2 mm, and the distance between the large-aperture metalens and the infrared focal plane array detector is greater than 30 mm. The metalens mechanical assembly uses a buffer structure to fix, adjust and protect the metalens from shocks. The housing is sealed through a thermal insulation coating, thus providing heat insulation and waterproof protection for the lens. The disclosure adopts strict electromagnetic field values, diffraction design algorithm and large-area semiconductor process manufacturing method to increase the aperture of metalens to 50 mm or more, and considerably improves the focal length and magnification of the camera while ensuring that the F-number of the metalens meets the requirements of signal-to-noise ratio of image. The problems of short focal length, small magnification, and insufficient imaging range of conventional metalens cameras are overcome, thus realizing detection and imaging of objects at medium and long ranges.