3results about How to "Eliminate aberrations" patented technology

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 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.