15results about How to "Eliminate aberrations" patented technology

The invention discloses a pixel projection lens and an automobile, and relates to the technical field of automobile illumination, the pixel projection lens is provided with an object side and an image side which are correspondingly arranged along the optical axis direction, the pixel projection lens comprises a first lens, a second lens, a third lens, a fourth lens and an image surface from the object side to the image side in sequence, the focal length of the first lens is f1, the focal length of the second lens is f2, the focal length of the third lens is f3, the focal length of the fourth lens is f4, and the pixel projection lens meets the following conditions: 10lt; f1lt; 20; -6 lt; f2lt; f2lt; -14.5,-14.5,-14.5; 30 lt; f3lt; f3t; 40); 35 lt; f4lt; f4t; 50; the first lens and the second lens are aspheric lenses, and the third lens and the fourth lens are glass spherical lenses. By means of the arrangement, the pixel projection lens is good in imaging quality and good in stability and can not defocus under the environment condition of-40 DEG C to 105 DEG C, and therefore it is fully guaranteed that the pixel projection lens works stably in the environment with the large temperature difference.

The invention discloses a transmission-type nondestructive testing method and system based on a terahertz area array detector, and belongs to the technical field of terahertz imaging nondestructive testing. According to the frequency mixing array imaging system based on the terahertz technology and based on shaping and focusing of terahertz wave beams, a ceramic or glass fiber reinforced composite material sample piece for aerospace is placed between the shaping lens and the imaging lens, transmission type detection is carried out on the sample piece, and the frequency mixing array detector obtains surface area information of the sample piece; and typical defect feature processing and defect identification are carried out, so that the state of the sample piece is rapidly evaluated. The invention aims to solve the problems of low efficiency and low imaging quality in the existing terahertz nondestructive testing technology. By adopting the terahertz area array detector and the optical imaging assembly, rapid and high-resolution nondestructive detection can be realized, and the terahertz area array detector is particularly suitable for application scenes requiring high detection efficiency and imaging quality.

The invention relates to a divisional application of which the application number is 202011626893.2. The invention relates to an eyepiece optical system with a large field angle and a head-mounted display device, and the system comprises a first lens group, a second lens group and a third lens group which are coaxially and sequentially arranged from a human eye observation side to a miniature image display side along an optical axis direction. The effective focal lengths of the first lens group, the second lens group and the third lens group are positive, negative and positive combinations; the first lens group comprises a first lens close to the human eye side and a second lens far away from the human eye side; the first lens group comprises at least two Fresnel optical surfaces; the first lens comprises at least one Fresnel optical surface; the second lens group includes a third lens adjacent to the first lens group; the third lens is a negative lens; the third lens group comprises a fourth lens, a fifth lens and a sixth lens which are adjacent to the second lens group and are sequentially arranged along the optical axis; the fourth lens and the sixth lens are positive lenses; the fifth lens is a negative lens; the system simultaneously realizes the indexes of large field angle, high image quality, low distortion, small field curvature, small size and the like.

The invention provides compositions and methods for achieving storage stable aceclidine. The compositions preferably comprise aceclidine, a cycloplegic agent, a surfactant, a tonicity adjuster and optionally a viscosity enhancer and an antioxidant. The invention further provides methods for treating refractive errors of the eye with a storage stable aceclidine composition.

The utility model relates to gem processing detection technical field more specifically, relate to a gem cutting and grinding process three -dimensional dynamic optical detection module, including mounting bracket, the mounting bracket includes upper roof, left side board, lower bottom plate and right side board, the upper roof, left side board, lower bottom plate and right side board combine and form the rectangular structure, wherein the middle part of upper roof is provided with fixed hole, the middle part of lower bottom plate is open, the right side and left side of lower bottom plate are provided with first off -axis parabolic mirror and second off -axis parabolic mirror respectively, the upside of first off -axis parabolic mirror and second off -axis parabolic mirror is provided with semiconductor laser and acquisition camera respectively. First off -axis parabolic mirror focuses laser to gem surface, second off -axis parabolic mirror captures the laser signal of gem surface reflection, and reflects it to acquisition camera, realizes the dynamic focusing of curved surface gem detection without aberration, and this detection mode adopts non -contact detection, avoids the damage of gem surface.

The present invention relates to an eyepiece optical system and device with a large field-of-view angle and high image quality, comprising a first lens group and a second lens group arranged successively along an optical axis from a human eye observing side to a micro display. The first lens group is composed of one or more lenses, and the second lens group comprises a Fresnel lens. The Fresnel lens comprises a Fresnel surface. By the use of a combination of a novel optical surface shape, i.e., the Fresnel surface shape, and traditional optical spherical and aspherical surface shapes, when focal lengths of various lenses and lens groups meet particular conditions, significant elimination of system aberration, reduction of the sensitivity of various optical components, and easy processing and assembly of the components can be achieved. Especially, optical indexes such as a large field-of-view angle, low distortion, low chromatism, low field curvature, and low astigmatism can be achieved at the same time, thus an observer can watch large pictures of full frame, high definition and uniform image quality without any distortion and get visual experience of high liveness via the eyepiece optical system according to the present invention.

The invention relates to a divisional application of which the application number is 202011621711.2. The invention relates to an eyepiece optical system with a large field angle and a head-mounted display device, and the system comprises a first lens group, a second lens group and a third lens group which are coaxially and sequentially arranged from a human eye observation side to a miniature image display side along an optical axis direction. The effective focal lengths of the first lens group, the second lens group and the third lens group are positive, negative and positive combinations; the first lens group is composed of two optical lenses, namely a first lens close to the human eye side and a second lens away from the human eye side. The first lens group comprises at least two Fresnel optical surfaces; the first lens comprises at least one Fresnel optical surface; wherein the second lens group comprises third lenses which are adjacent to the first lens group and are sequentially arranged along the optical axis; the third lens group comprises a fourth lens and a fifth lens which are adjacent to the second lens group and are sequentially arranged along the optical axis; the system can realize the indexes of large field angle, high image quality, low distortion, small field curvature, small size and the like.

The present invention relates to an eyepiece optical system and device with a large field-of-view angle and high image quality, comprising a first lens group and a second lens group arranged successively along an optical axis from a human eye observing side to a micro display. The first lens group is composed of one or more lenses, and the second lens group comprises a Fresnel lens. The Fresnel lens comprises a Fresnel surface. By the use of a combination of a novel optical surface shape, i.e., the Fresnel surface shape, and traditional optical spherical and aspherical surface shapes, when focal lengths of various lenses and lens groups meet particular conditions, significant elimination of system aberration, reduction of the sensitivity of various optical components, and easy processing and assembly of the components can be achieved. Especially, optical indexes such as a large field-of-view angle, low distortion, low chromatism, low field curvature, and low astigmatism can be achieved at the same time, thus an observer can watch large pictures of full frame, high definition and uniform image quality without any distortion and get visual experience of high liveness via the eyepiece optical system according to the present invention.

An optical lens disclosed by the present invention comprises a first lens group, a liquid lens and a second lens group which are sequentially arranged from an object space to an image space along an optical axis, the first lens group has positive focal power, the second lens group has positive focal power, the first lens group comprises a first lens, a second lens, a third lens, a fourth lens and a fifth lens, and the fifth lens comprises a fourth lens and a fifth lens. The second lens group comprises a sixth lens, a seventh lens, an eighth lens and a ninth lens, the first lens has negative focal power, the second lens has negative focal power, the third lens has positive focal power, the fourth lens has positive focal power, the fifth lens has negative focal power, the sixth lens has positive focal power, the seventh lens has negative focal power, and the ninth lens has negative focal power. The eighth lens has positive focal power, and the ninth lens has negative focal power. According to the optical lens provided by the embodiment of the invention, the original fixed working distance focusing optical lens is expanded into the working distance adjustable optical lens within the range of 1935mm, and the optical lens is small in size, light in weight and low in cost.

The utility model discloses a car lamp projection lighting system. A spatial light modulator, a projection lens and a photomask are sequentially arranged from an object side to an image side. The spatial light modulator is a DMD, an LCD or an LCoS, and is an object space in the vehicle lamp projection illumination system. The projection lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a diaphragm, wherein the first lens, the second lens and the third lens form a three-separated lens group or a single-double separated lens group. The diaphragm is located between the first lens and the photomask and specifically comprises an aperture diaphragm and a field diaphragm. The photomask is located between the fifth lens and the image space. The car lamp projection lighting system has the advantages of being high in optical efficiency and good in imaging quality, and meets the requirement for high resolution while meeting high-brightness lighting. In addition, the system is simple and compact in structure, and the lens is made of a full-glass material, so that the system has good environmental reliability.

The invention relates to a divisional application of which the application number is 202011626965.3. The invention also relates to a preparation method of the invention. The invention relates to an eyepiece optical system with a large field angle and a head-mounted display device, and the system comprises a first lens group, a second lens group and a third lens group which are coaxially and sequentially arranged from a human eye observation side to a miniature image display side along an optical axis direction. The effective focal lengths of the first lens group, the second lens group and the third lens group are positive, negative and positive combinations; the first lens group is composed of two optical lenses, namely a first lens close to the human eye side and a second lens away from the human eye side. The first lens group comprises at least two Fresnel optical surfaces; the second lens group is composed of two optical lenses. Wherein the second lens group comprises a third lens and a fourth lens which are adjacent to the first lens group and are sequentially arranged along the optical axis; the third lens and the fourth lens are both negative lenses; the third lens group is composed of two optical lenses. The system has the advantages of large field angle, high image quality, low distortion, small field curvature, small size and the like.

The invention discloses an optical system, a camera module and electronic equipment, the optical system comprises seven lenses with refractive power, and the optical system sequentially comprises a first lens, a fourth lens and a sixth lens with positive refractive power, and a second lens, a third lens, a fifth lens and a seventh lens with negative refractive power from an object side to an image side along an optical axis; wherein the object side surface of the first lens, the object side surface of the second lens, the object side surface of the third lens, the image side surface of the fourth lens, the object side surface of the fifth lens, the object side surface of the sixth lens and the object side surface of the seventh lens are convex surfaces near the optical axis; the image side surface of the first lens, the image side surface of the second lens, the image side surface of the third lens, the image side surface of the fifth lens, the image side surface of the sixth lens and the image side surface of the seventh lens are concave surfaces at the positions close to the optical axis. The optical system can satisfy miniaturization, and has a good imaging effect and a variable aperture characteristic.

The invention relates to the technical field of projection display in an optical imaging system, and discloses an ultra-short-focus projection system, which is sequentially provided with a display chip, a lens group and a reflection bowl along a light path, the lens group comprises a plurality of lenses which are arranged on the same optical axis, and the lenses from the first lens to the twelfth lens are sequentially arranged from the reflection bowl side to the display chip side. The first lens is a first aspheric lens, the second lens is a second aspheric lens, the third lens is a first spherical convex lens, the fourth lens is a spherical concave lens, the fifth lens is a second spherical convex lens, the sixth lens, the seventh lens and the eighth lens are combined into a triple cemented lens, and the ninth lens and the tenth lens are combined into a doublet lens. The eleventh lens is an aspheric lens, and the twelfth lens is a meniscus lens. A diaphragm is arranged between the fourth lens and the fifth lens, and a TIR prism is arranged between the display chip and the twelfth lens. The invention has the advantages that: short-focus projection is realized, and the imaging definition is ensured.

The utility model belongs to the technical field of optical imaging, and particularly relates to an optical imaging lens group and an optical lens, and the lens group comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens which are sequentially and coaxially arranged along the light incidence direction, the second lens is a meniscus negative lens of which the concave surface faces the object side; the third lens is a biconcave negative lens; the fourth lens is a meniscus positive lens of which the convex surface faces the image side; the fifth lens is a meniscus positive lens of which the convex surface faces the object side; a diaphragm; the sixth lens is a biconcave negative lens; the seventh lens is a biconvex positive lens; the eighth lens is a biconvex positive lens; the ninth lens is a biconvex positive lens; the tenth lens is a biconvex positive lens; an eleventh lens which is a negative meniscus lens with a concave surface facing the image side; the lens adopts the optical imaging lens group. According to the utility model, clear imaging can be realized, and the advantages of excellent image quality, high imaging resolution, large F number and the like are realized; the method can be adapted to a large-target-surface sensor, and supports long-distance (10m) clear imaging.

The short-wave infrared hyperspectral telephoto lens is composed of six lenses, the six lenses are a positive lens, a negative lens, a negative lens, a negative lens, a positive lens and a positive lens in sequence in the light incidence direction, the focal length of the short-wave infrared hyperspectral telephoto lens is 13.94 mm, the image space F number is 2.3, the field angle is 12 degrees, and the total length is 19.25 mm; the operating wavelength range of the short-wave infrared hyperspectral telephoto lens is 1000 nm to 2500 nm. The short-wave infrared hyperspectral telephoto lens adopts an image space telecentric structure and can provide constant magnification in a certain object distance range, so that perspective errors are effectively eliminated, and emergent light of the short-wave infrared hyperspectral telephoto lens is parallel to an optical axis and can be better matched with a light splitting system. The short-wave infrared hyperspectral telephoto lens is provided with four aspherical lenses, the design freedom degree is increased, the propagation path of wave band light can be flexibly controlled, aberration such as spherical aberration and coma aberration is effectively eliminated, the imaging quality is remarkably improved, and the short-wave infrared hyperspectral telephoto lens has the advantages of being small in size, good in image quality and the like.