49results about How to "Large clear aperture" patented technology

A high resolution stereo mapping and reconnaissance integrated camera optical system comprises a high resolution stereo detection branch and a laser ranging branch, wherein the high resolution stereo detection branch and the laser ranging branch adopt a shared primary mirror and a shared secondary mirror, adopt independent subsequent optical paths and independent optical elements, and form two independent optical branches. The two branches are different in field angles of incident light rays, a field out of an axis is utilized by the high resolution stereo detection branch, a field on the axis is utilized by the laser ranging branch, the light rays in the field of the two branches simultaneously reach the primary mirror and the secondary mirror, a light beam of the high resolution stereo detection branch passes though four aspheric surface reflecting mirrors and then reach a high resolution stereo detection focal plane to be imaged, and a light beam of the laser ranging branch passes through the primary mirror and the secondary mirror, then passes through an optical filter and laser relay lens set and then is converged on a laser focal plane. The high resolution stereo mapping and reconnaissance integrated camera optical system has the advantages that resolution is high, distortion is zero, an optical-mechanical structure is high in integration level, the size is small and the weight is light. The high resolution stereo mapping and reconnaissance integrated camera optical system achieves high resolution, high precision detection and stereo ranging mapping functions for large-range surface features.

The invention belongs to the technical field of optical devices and particularly relates to a small glass-plastic hybrid athermal prime lens. The small glass-plastic hybrid athermal prime lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens which are arranged sequentially from an object space to an image space, wherein the first lens is a convex-concave negative-power glass spherical lens, the second lens is a biconcave negative-power plastic aspherical lens, the third lens is a biconvex positive-power glass spherical lens, the fourth lens is a biconcave negative-power plastic aspherical lens, the fifth lens is a biconvex positive-power plastic aspherical lens, the sixth lens is a biconvex positive-power glass spherical lens, and the seventh lens is a concave-convex negative-power glass spherical lens. Compared with the prior art, the small glass-plastic hybrid athermal prime lens has the advantages that the small glass-plastic hybrid athermal prime lens is a 4 mm prime lens with a 4k resolution ratio, is large in clear aperture and small in size and has a wide field angle up to 140 degrees, an F value is up to 2.0, and the total optical length is smaller than 22.2 mm.

The invention discloses a basic structure of a fish-eye lens with a viewing angle of 240 degrees. The fish-eye lens comprises seven lens groups which are combined by ten lenses. By adopting the form of the structure, the viewing angle of the fish-eye lens which is composed of spherical surfaces is creatively raised to 240 degrees and the limiting aperture which can reach F/1.4 to the maximum extent is kept and the other performances do not be reduced. As an overlarge viewing angle, a relatively big aperture, a supersized retrofocus ratio and an excellent image fault matching are adopted, therefore, single lens reflex, super viewing angle, and approximately all airspace, maritime-space and municipal shooting and monitoring can be realized in a plurality of fields, equidistant projection and showing of images, the shape change of which can be controlled, in an IMAX dome which is appropriate to the whole globe, and clear and bright images can be ensured. Meanwhile, the structure is compact, and the disadvantage of negative thickness of the edge of the lens is successfully eliminated; the fish-eye lens is easy to be processed and extremely has practical significance.

The invention discloses an optical system for generating an approximate diffraction-free zero-order Mathieu beam. The optical system for generating the approximate diffraction-free zero-order Mathieu beam comprises an optical platform, a laser device is arranged on the optical platform, and a cylindrical lens, a short focal length lens, a long focal length lens and an axicon are arranged along the light path of the laser device, wherein the short focal length lens is arranged nearby the focus of the cylindrical lens, and the focus of the short focal length lens and the focus of the long focal length lens are overlapped. The optical system can generate the approximate diffraction-free zero-order Mathieu beam, and provides a simple and effective new approach for obtaining the zero-order Mathieu beam. The beam can be applied to the fields of laser material processing, collimation measurement, optical wireless communication and the like.

The invention relates to the technical field of lenses. The invention discloses an infrared confocal zoom lens which is provided with seventeen lenses. A first fixed lens group is formed by a first lens, a second lens and a third lens, and a zoom lens group is formed by a fourth lens, a fifth lens and a sixth lens; a seventh lens to a tenth lens form a second fixed lens group; an eleventh lens toa seventeenth lens form a focusing lens group; a diaphragm is arranged between the zoom lens group and the second fixed lens group; the refractive indexes and the surface types of the first lens to the seventeenth lens are correspondingly limited; and the first lens and the second lens are glued with each other, the fifth lens and the sixth lens are glued with each other, the ninth lens and the tenth lens are glued with each other, the eleventh lens and the twelfth lens are glued with each other, the fourteenth lens and the fifteenth lens are glued with each other, and the sixteenth lens and the seventeenth lens are glued with each other. The infrared confocal zoom lens has the advantages of large focal length section span, high unit pixel ratio, large image surface, large light transmission, small chromatic aberration and good infrared confocal property.

The invention discloses a reflecting-type double-band low-light imaging instrument, and the instrument comprises a reflecting-type ultraviolet band imaging system (a), a visible light band imaging system (b), and an image fusion unit (11) which enables an image obtained by the reflecting-type ultraviolet band imaging system (a) and an image obtained by the visible light band imaging system (b) to be fused in one image. The instrument can achieve the imaging of the same target at an ultraviolet band and a visible light band, has a monitoring function, is simple in structure, is reasonable in design, has no chromatic aberration, and is high in detection accuracy.

The invention discloses a high-temporal-spatial-resolution soft X-ray radiation flow quantitative measuring system. According to the system, a measured light source is arranged in front of two grazingincidence X-ray microscopes, X-rays emitted by the light source respectively pass through two channels of the microscopes and are respectively imaged to an X-ray diode detector and a cathode of an X-ray streak camera through a slotted scintillator, a neutral attenuator and a composite filter, photoelectrons are generated, and high-temporal-spatial-resolution measurement of the X-ray radiation flow can be realized. Compared with the prior art, according to the system, pinholes are replaced by the grazing incidence X-ray microscopes for imaging, the spatial resolution and the sensitivity of themeasuring system are improved, the streak camera and the X-ray diode detector perform comparative measurement, quantitative measurement of the X-ray radiation flow is realized by the streak camera, and the temporal resolution of the measurement of the radiation flow is improved; besides, high-temporal-spatial resolution quantitative measurement can be performed on the energy flow of the nanosecond pulse soft X-ray source radiation, and the application prospect of the system in the field of pulse X-ray radiation detection is wide.

The invention discloses a low-distortion lens comprising a first lens group, a variable diaphragm and a second lens group which are arranged in turn along the light incident direction. The first lensgroup and the second lens group have positive focal power and can move along the light axis. The first lens group comprises a negative lens piece group and a positive lens piece group, and the first lens group and the second lens group meet the following relationship: 3<f1/f2<5; -0.3<f11/f1<-0.1, wherein f1 represents the focal length value of the first lens group, f2 represents the focal length value of the second lens group, and f11 represents the focal length value of the negative lens piece group of the first lens group. According to the low-distortion lens, short focal length and large aperture can be realized, and the size is small so that low distortion can be realized, the imaging effect is great and the low-distortion lens can be widely applied to the optical lens industry.

The invention discloses an optical system capable of generating banding diffraction-free light beams. The optical system comprises an optical platform. A laser is disposed on the optical platform, and a short-focal-length lens, a long-focal-length lens, an elliptical-aperture film and an axicon are sequentially arranged along a laser path of the laser. The focus of the short-focal-length lens is superposed with the focus of the long-focal-length lens; the elliptical-aperture film is close to the axicon; the diameter of a light beam irradiating the elliptical-aperture film from the long-focal-length lens is larger than that of a short axis of an elliptical hole of the elliptical-aperture film. The optical system is capable of conveniently generating the banding diffraction-free light beams and provides a new way for generating the banding diffraction-free light beams in low-cost, simple and effective manner. During actual use, the optical system has a special significance in improving optical nondestructive detecting and detecting efficiency in bar code scanning.

Provided are an optical lens and an imaging device including the optical lens. The optical lens sequentially includes a first lens, a second lens, a third lens, a fourth lens and a fifth lens from anobject side to an image side along the optical axis, wherein the first lens has negative refractive focal power, the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface; the second lens has positive focal power, and the object side surface and the image side surface of the second lens are both convex surfaces; the third lenshas negative focal powder, and the image side surface of the third lens is a concave surface; the fourth lens has positive focal power, and both the object side surface and the image side surface of the fourth lens are convex surfaces; and the fifth lens has negative focal power, the object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a concave surface. The optical lens can achieve at least one of the advantages such as good imaging quality, long-focus distant shooting, large angle of view, large aperture and miniaturization.

An optical lens and an imaging device including the same are disclosed. The optical lens can sequentially comprise a first lens, a second lens, a third lens and a fourth lens from the object side to the image side along the optical axis. The first lens can have negative focal power, the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface; the second lens can have positive focal power, and the object side surface and the image side surface of the second lens are convex surfaces; the third lens can have positive focal power, and the object side surface and the image side surface of the third lens are convex surfaces; the fourth lens can have negative focal power, the object side face of the fourth lens is a convex face,the image side face of the fourth lens is a concave face, and the object side face or the image side face comprises at least one inflection point. According to the optical lens provided by the invention, at least one of the beneficial effects of good imaging quality, good thermal compensation, large field angle, large clear aperture, high picture brightness, miniaturization and the like can be achieved.

The invention provides a method for making large-area photonic crystals. The steps are as follows: (1) Embedding several wedge-shaped prisms on a flat plate, with the bottom edge of the wedge-shaped prisms facing the center of the flat plate to make a multi-wedge mirror plate; (2) The laser beam emitted by the laser (1) is expanded by a beam expander, and the expanded light is irradiated onto the polygonal mirror plate made in step (1), and the beam passes through the polygonal mirror plate and then irradiates on the photosensitive material. Exposure to obtain photonic crystals. In the invention, the large-area multi-beam interference intensity pattern is projected onto the photosensitive material to produce a photonic crystal structure with a large area. By properly designing the polygonal mirror plate, the device can flexibly fabricate photonic crystal structures with different period scales and shapes. The method and device are suitable for processing and manufacturing large-area photonic crystal structures.

The invention discloses a long-focus optical lens. The lens comprises a first lens with double-convex positive focal power, a second lens with double-concave negative focal power, a third lens with double-convex positive focal power, a fourth lens with double-convex positive focal power, a fifth lens with double-concave negative focal power, a sixth lens with double-convex positive focal power, a seventh lens with double-concave negative focal power an eighth lens with double-convex positive focal power, and a ninth lens with double-concave negative focal power which are sequentially arranged from an object plane to an image plane, each lens is a glass spherical lens, the first lens, the second lens and the third lens are glued to form a first lens group, the fourth lens and the fifth lens are glued to form a second lens group, the sixth lens and the seventh lens are glued to form a third lens group, the eighth lens and the ninth lens are glued into a fourth lens group, and the overall focal length of the lens is larger than the total optical length. The lens can effectively correct aberration, improves imaging quality, has larger clear aperture and focal length compared with a lens of the same type, and realizes high-quality telephoto imaging.

The invention discloses an infrared imaging lens and imaging equipment. The infrared imaging lens sequentially comprises a first group with negative focal power, a diaphragm and a second group with positive focal power from an object side to an imaging surface along an optical axis. The first group sequentially comprises a first lens with negative focal power and a second lens with positive focal power from the object side to the imaging surface, wherein the object side surface of the first lens is a concave surface in a paraxial position, and the image side surface of the first lens is a concave surface; the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface. The second group sequentially comprises a third lens with positive focal power, a fourth lens with positive focal power and a fifth lens with positive focal power from the object side to the imaging surface, wherein the object side surface and the image side surface of the third lens are convex surfaces; the object side surface and the image side surface of the fourth lens are convex surfaces; and the object side surface of the fifth lens is a convex surface. The infrared imaging lens has the advantages of being large in clear aperture, large in field angle and stable in optical performance at the temperature ranging from -40 DEG C to 105 DEG C.

The invention relates to the technical field of lenses, and discloses an optical imaging lens. The optical imaging lens comprises ten lenses. The first lens, the second lens, the sixth lens and the ninth lens are convexo-convex lenses with a positive refractive power, and the third lens and the fifth lens are concavo-concave lenses with a negative refractive index, the fourth lens is a plano-convex lens with the positive refractive index, the seventh lens is a concave-convex lens with the negative refractive index, the eighth lens is a convex-concave lens with the negative refractive index, and the tenth lens is a concavo-concave lens or concave-convex lens with the negative refractive index. The image side surface of the second lens and the object side surface of the third lens are gluedto each other; the image side surface of the fourth lens and the object side surface of the fifth lens are glued to each other; the image side surface of the sixth lens and the object side surface ofthe seventh lens are glued to each other; and the image side surface of the eighth lens and the object side surface of the ninth lens are glued to each other. The optical imaging lens has the advantages of a large image surface, a high ratio of unit pixel, large light transmission, good chromatic aberration optimization and good imaging quality.

The invention relates to the technical field of lenses, and discloses an optical imaging lens. The optical imaging lens comprises twelve lenses, a first lens element with positive refractive index hasa convex object-side surface, a second lens element with negative refractive index has a concave image-side surface, a third lens and an eleventh lens are concave lenses with negative refractive indexes, a fourth lens, a fifth lens and a twelfth lens are convex lenses with positive refractive indexes, a sixth lens is a convex flat lens with positive refractive index, a seventh lens has positive refractive index and the image side surface is a convex surface, an eighth lens is a convex-concave lens with negative refractive index, a ninth lens is a convex-concave lens with positive refractive index, a tenth lens is a flat convex lens with positive refractive index, and the third lens and the fourth lens are glued with each other; the eighth lens and the ninth lens are glued with each other;and the tenth lens and the eleventh lens are glued with each other. The optical imaging lens has the advantages of the large image surface, the high unit pixel ratio, large light transmission, good chromatic aberration optimization and good imaging quality.