1071 results about "Surface shape" patented technology

The invention provides an optical lens, which comprises nine lenses from an object side to an imaging surface along an optical axis: a first lens with negative focal power, a second lens with negative focal power, a third lens with negative focal power, a fourth lens with negative focal power, a fifth lens with negative focal power and a sixth lens with negative focal power, 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 object side surface of the third lens is a convex surface, and the image side surface of the third lens is a concave surface; the object side surface of the fourth lens is a concave surface, and the image side surface of the fourth lens is a convex surface; the object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a convex surface; the sixth lens has negative focal power; the seventh lens has positive focal power; the eighth lens has negative focal power; and the ninth lens has positive focal power. According to the optical lens provided by the invention, through specific surface shape matching and reasonable focal power distribution, the lens has one or more advantages of short focus, miniaturization, large field angle, large aperture, large target surface, low distortion and low sensitivity.

The invention relates to a pre-compensation flexible assembling and adjusting mechanism of a large-diameter transmission reflector. The pre-compensation flexible assembling and adjusting mechanism comprises the large-diameter transmission reflector, a glue joint mandrel, an isolation telecentric flexible hinge, an isolation plate, a hooke flexible hinge, an adjusting flexible branch chain, an anti-rotation flexible branch chain, a back plate and a driving assembly. The large-aperture transmission reflector is provided with three blind holes for glue joint, and is connected with the isolation plate through three groups of glue joint mandrels and isolation telecentric flexible hinges, so that isolation of load deformation interference of the isolation plate is realized; the driving ends of the two adjusting flexible branch chains are correspondingly connected with two driving assemblies installed on the back plate, and the connecting ends of the adjusting flexible branch chains are connected with the isolation plate. One ends of the Hooke flexible hinges and the anti-rotation flexible branch chains are connected with the isolation plate, and the other ends are connected with the back plate; the device has the advantages of being simple in structural form, stable in movement and high in precision, meanwhile, the return clearance caused by axial load reversing under heavy loads can be avoided, the additional surface shape caused by assembling and adjusting stress is effectively isolated, and the additional surface shape caused by gravity is compensated.

The invention provides an optical lens, which comprises nine lenses from an object side to an imaging surface along an optical axis: a first lens with negative focal power, a second lens with negative focal power, a third lens with negative focal power, a fourth lens with negative focal power, a fifth lens with negative focal power and a sixth lens with negative focal power, 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 object side surface of the third lens is a convex surface, and the image side surface of the third lens is a concave surface; the object side surface of the fourth lens is a concave surface, and the image side surface of the fourth lens is a convex surface; the object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a convex surface; the sixth lens has negative focal power; the seventh lens has positive focal power; the eighth lens has negative focal power; and the ninth lens has positive focal power. According to the optical lens provided by the invention, through specific surface shape matching and reasonable focal power distribution, the lens has one or more advantages of short focus, miniaturization, large field angle, large aperture, large target surface, low distortion and low sensitivity.

The invention provides an optical lens, which comprises nine lenses from an object side to an imaging surface along an optical axis: a first lens with negative focal power, a second lens with negative focal power, a third lens with negative focal power, a fourth lens with negative focal power, a fifth lens with negative focal power and a sixth lens with negative focal power, 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 object side surface of the third lens is a convex surface, and the image side surface of the third lens is a concave surface; the fourth lens has negative focal power, and the object side surface of the fourth lens is a concave surface; the object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a convex surface; the sixth lens has negative focal power, and the image side surface of the sixth lens is a concave surface; the seventh lens has positive focal power; the eighth lens has negative focal power; and the ninth lens has positive focal power. According to the optical lens provided by the invention, through specific surface shape matching and reasonable focal power distribution, the lens has one or more advantages of short focus, miniaturization, large field angle, large aperture, large target surface, low distortion and low sensitivity.

The invention provides an optical lens, which comprises nine lenses from an object side to an imaging surface along an optical axis: a first lens with negative focal power, a second lens with negative focal power, a third lens with negative focal power, a fourth lens with negative focal power, a fifth lens with negative focal power and a sixth lens with negative focal power, 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 object side surface of the third lens is a convex surface, and the image side surface of the third lens is a concave surface; the object side surface of the fourth lens is a concave surface, and the image side surface of the fourth lens is a convex surface; the object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a convex surface; the sixth lens has negative focal power; the seventh lens has positive focal power; the eighth lens has positive focal power; and the ninth lens has positive focal power. According to the optical lens provided by the invention, through specific surface shape matching and reasonable focal power distribution, the lens has one or more advantages of short focus, miniaturization, large field angle, large aperture, large target surface, low distortion and low sensitivity.

The invention discloses an optical performance-oriented key geometric error identification method for a large aspheric element multi-axis numerical control machine tool. According to the method, a tool setting point is used as a key node to establish a surface shape error model, geometric errors and surface shape errors of a machine tool are accurately associated, multi-error coupling analysis is simplified, and targeted compensation, online monitoring and real-time correction are achieved. On the basis, a machine tool space error model is constructed in combination with a multi-body system theory, a mapping relation between a surface shape error and wavefront aberration is established by utilizing a ray tracing theory, the wavefront aberration is fitted through a Zernike polynomial, and the contribution degree of each geometric error to the aberration is quantified by means of principal component analysis, so that a key geometric error is identified and compensation is implemented. According to the method, the machining error and the final optical performance are directly associated, and the machining precision and the performance quality of the large aspheric element can be improved. The method is suitable for the manufacturing field of large complex optical elements machined by a multi-axis numerical control machine tool.

The invention provides an optical lens, which comprises nine lenses from an object side to an imaging surface along an optical axis: a first lens with negative focal power, a second lens with negative focal power, a third lens with negative focal power, a fourth lens with negative focal power, a fifth lens with negative focal power and a sixth lens with negative focal power, 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 object side surface of the third lens is a convex surface, and the image side surface of the third lens is a concave surface; the image side surface of the fourth lens is a convex surface; the object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a convex surface; the sixth lens has negative focal power, and the image side surface of the sixth lens is a concave surface; the seventh lens has positive 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 invention, through specific surface shape matching and reasonable focal power distribution, the lens has one or more advantages of short focus, miniaturization, large field angle, large aperture, large target surface, low distortion and low sensitivity.

The invention provides an optical lens, which comprises four lenses with focal power and sequentially comprises a first lens with negative focal power, a second lens with negative focal power, a third lens with positive focal power, a fourth lens with negative focal power, a fifth lens with negative focal power and a sixth lens with negative focal power from an object side to an imaging surface along an optical axis, 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 object side surface of the third lens is a convex surface, and the image side surface of the third lens is a convex surface; the image side surface of the fourth lens is a convex surface; wherein the maximum field angle FOV of the optical lens and the real image height IH corresponding to the maximum field angle of the optical lens meet the following conditions: 35 degrees / mmlt; fOV / IHlt; 46 degrees / mm; the focal length f3 of the third lens and the focal length f4 of the fourth lens satisfy 0.5 lt; f3 / f4lt; and 0.8. According to the optical lens provided by the invention, through specific surface shape matching and reasonable focal power distribution, the lens has one or more advantages of an ultra-wide angle, a large aperture, high imaging quality, high collimation and the like.

The invention provides an optical lens, which comprises seven lenses in total, and sequentially comprises a first lens with positive focal power, a second lens with negative focal power, a third lens with positive focal power and a fourth lens with negative focal power from an object side to an imaging surface along an optical axis, the second lens has positive focal power; the object side surface of the third lens is a concave surface; the object side surface of the fourth lens is a convex surface, and the image side surface of the fourth lens is a convex surface; the object side surface of the fifth lens is a concave surface, and the image side surface of the fifth lens is a convex surface; the sixth lens has positive focal power, and the object side surface of the sixth lens is a convex surface; the object side surface of the seventh lens is a concave surface, and the image side surface of the seventh lens is a concave surface; wherein the curvature radius R13 of the object side surface of the seventh lens and the curvature radius R14 of the image side surface of the seventh lens meet the formula: (R13 + R14) / (R13-R14) lt, and 0.8. According to the optical lens provided by the invention, through specific surface shape matching and reasonable focal power distribution, the lens has one or more advantages of long focus, large aperture, high imaging quality and the like.

The invention provides a precision manufacturing method of a special-shaped lens, a convex spherical surface and a concave aspheric surface are formed on the front and back surfaces of the special-shaped lens respectively, a chord plane is formed on each of the two sides of the special-shaped lens, and the method comprises the following steps: S1, performing rough grinding forming on set fitting spherical surfaces of the convex spherical surface and the concave aspheric surface of the special-shaped lens; s2, turning a concave aspheric surface; s3, after turning is completed, whether the concave aspheric surface is qualified or not is detected, if yes, the step S4 is executed, and if not, the step S2 is repeated; s4, discharging from the disc, cleaning the special-shaped lens, and protecting the concave aspheric surface by using a protective layer; s5, starting the numerical control machining center, and machining two chord planes by taking the convex spherical surface and the concave surface platform as positioning references; s6, a machine tool is started, the protected concave aspheric surface and the special-shaped matching tool are placed into a vacuum adsorption tool together, a polishing disc is installed, and a polishing program is started; and S7, detecting the surface shape precision and the surface smoothness of the convex spherical surface. According to the method, the edge breaking phenomenon during machining is effectively avoided, and the machining difficulty is reduced.

The optical system disclosed in the embodiment of the invention includes first to seventh lenses arranged along an optical axis from an object side to a sensor side, wherein an object-side surface of the first lens is convex, at least one of an object-side surface and a sensor-side surface of the sixth lens has at least one critical point, each of an object-side surface and a sensor-side surface of the seventh lens has a critical point, at least one of the object-side surface and the sensor-side surface of the seventh lens has a freeform surface shape in which a lens surface orthogonal to the optical axis in a first direction and a lens surface orthogonal to the optical axis in a second direction are asymmetrical, and the freeform surface may have symmetrical lens surfaces on both sides of the first direction with respect to the optical axis and symmetrical lens surfaces on both sides of the second direction with respect to the optical axis.

The invention discloses a self-adaptive optical lens curved surface optimization processing method based on machine learning, and the method comprises the steps: generating an optimal target curved surface which is easy to process based on the optical performance and manufacturability criterion through employing a first machine learning model; after the current surface shape error is obtained through machining and measurement, modeling is conducted on the non-linear and space coupling effect in the machining process through a second machine learning model, so that an optimal compensation machining scheme is predicted and determined; compensation processing is executed, and iterative circulation is carried out until the surface shape error is converged to a preset threshold value; according to the method, the processing convergence can be improved from the source, high-precision intelligent error compensation is realized, and the manufacturing efficiency and the yield of high-end optical elements are expected to be improved.

The invention provides an optical lens, which comprises seven lenses in total, and sequentially comprises a first lens with negative focal power, a second lens with negative focal power, a third lens with negative focal power, a fourth lens with negative focal power, a fifth lens with negative focal power and a sixth lens with negative focal power from an object side to an imaging 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 object side surface of the third lens is a convex surface, and the image side surface of the third lens is a concave surface; the object side surface of the fourth lens is a convex surface, and the image side surface of the fourth lens is a convex surface; the object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a convex surface; the sixth lens has negative focal power; the seventh lens has positive focal power, and the object side surface of the seventh lens is a convex surface; the optical total length TTL of the optical lens and the aperture value Fno of the optical lens meet the following conditions: 6.2 mmlt; tTL / Fnoult is carried out; 7.4 mm. According to the optical lens provided by the invention, through specific surface shape matching and reasonable focal power distribution, the lens has one or more advantages of miniaturization, large wide angle, large aperture, high imaging quality and the like.

The invention provides an optical lens, which comprises eight lenses from an object side to an imaging surface along an optical axis: a first lens with negative focal power, a second lens with negative focal power, a third lens with negative focal power, a fourth lens with negative focal power, a fifth lens with negative focal power and a sixth lens with negative focal power, the object side surface of the second lens is a concave surface; the third lens has positive focal power; the object side surface of the fourth lens is a concave surface, and the image side surface of the fourth lens is a convex surface; the fifth lens has positive focal power, and the image side surface of the fifth lens is a convex surface; the object side surface of the sixth lens is a concave surface, and the image side surface of the sixth lens is a concave surface; the seventh lens has positive focal power, and the object side surface of the seventh lens is a convex surface; the object side surface of the eighth lens is a concave surface, and the image side surface of the eighth lens is a convex surface. According to the optical lens provided by the invention, through specific surface shape matching and reasonable focal power distribution, the lens has one or more advantages of an ultra-wide angle, a large image plane, a large aperture, high imaging quality and the like.

The invention provides an optical lens, which comprises eight lenses from an object side to an imaging surface along an optical axis: a first lens with negative focal power, a second lens with negative focal power, a third lens with negative focal power, a fourth lens with negative focal power, a fifth lens with negative focal power and a sixth lens with negative focal power, the object side surface of the second lens is a concave surface, and the image side surface of the second lens is a concave surface; the third lens has positive focal power; the object side surface of the fourth lens is a convex surface, and the image side surface of the fourth lens is a convex surface; the object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a convex surface; the object side surface of the sixth lens is a concave surface, and the image side surface of the sixth lens is a concave surface; the seventh lens has positive focal power, and the object side surface of the seventh lens is a convex surface; the object side surface of the eighth lens is a concave surface, and the image side surface of the eighth lens is a convex surface. According to the optical lens provided by the invention, through specific surface shape matching and reasonable focal power distribution, the lens has one or more advantages of an ultra-wide angle, a large image plane, a large aperture, high imaging quality and the like.

The invention provides an optical lens, which comprises seven lenses in total, and sequentially comprises a first lens with negative focal power, a second lens with negative focal power, a third lens with positive focal power, a fourth lens with negative focal power, a fifth lens with negative focal power and a sixth lens with negative focal power from an object side to an imaging 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 object side surface of the third lens is a concave surface, and the image side surface of the third lens is a convex surface; the object side surface of the fourth lens is a convex surface, and the image side surface of the fourth lens is a convex surface; the object side surface of the fifth lens is a concave surface, and the image side surface of the fifth lens is a concave surface; the object side surface of the sixth lens is a convex surface, and the image side surface of the sixth lens is a convex surface; and the seventh lens has positive focal power. According to the optical lens provided by the invention, through specific surface shape matching and reasonable focal power distribution, the lens has the advantages of short focus, ultra-large field angle, high resolution, good imaging quality and clear edge field imaging.

A surface scanning tool and methods of using a surface scanning tool to determine a surface shape of a tool. In embodiments, the surface scanning tool includes a laser, a detector, and a signal analysis module. The laser sends a beam of light that is reflected off a bottom surface of the tool. The detector receives the reflected beam of light and sends the reflected beam of light signals to a signal analysis module. The signal analysis module determines a surface shape of the bottom surface and triggers mitigation actions. In alternative embodiments, the surface scanning tool includes a camera and a signal analysis module. The camera takes a picture of the bottom surface of the tool and sends the image to the signal analysis module. The signal analysis module determines the surface shape of the bottom surface and triggers mitigation actions.

The invention provides an optical lens, which comprises seven lenses, and sequentially comprises a first lens with negative focal power, a second lens with negative focal power, a third lens with negative focal power, a fourth lens with negative focal power, a fifth lens with negative focal power and a sixth lens with negative focal power from an object side to an imaging surface, the object side surface of the second lens is a concave surface; the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a convex surface; the fourth lens has positive focal power, and the object side surface of the fourth lens is a convex surface; the fifth lens has positive focal power, and the image side surface of the fifth lens is a convex surface; the object side surface of the sixth lens is a concave surface, and the image side surface of the sixth lens is a concave surface; and the object side surface of the seventh lens is a convex surface, and the image side surface of the seventh lens is a concave surface. According to the optical lens provided by the invention, through specific surface shape matching and reasonable focal power distribution, the imaging quality of the optical lens is improved, so that the lens has one or more advantages of large field angle, large aperture, large image height, high pixel, small distortion, high imaging quality and the like.

This invention relates to the field of optical element manufacturing technology, and more particularly to a form and position reference component and a method for manufacturing a multifaceted optical element. The method includes: providing a blank and a form and position reference component; the blank including a connected positioning part and a main body part; determining the target coordinates of the target multifaceted optical element in a reference spatial coordinate system; placing the positioning part in a positioning groove to fix the blank on a base; determining the basic coordinates of the blank in the reference spatial coordinate system; determining the machining allowance based on the difference between the basic coordinates and the target coordinates; machining the blank based on the machining allowance to obtain an initial multifaceted optical element; using a target sphere as a detection reference, sequentially detecting the relative positions and surface shape errors of multiple faces of the initial multifaceted optical element, and iteratively processing until the multifaceted optical element is obtained. This invention at least helps to reduce the manufacturing difficulty of multifaceted optical elements.

The invention discloses a concrete strength detection device for building construction, and belongs to the technical field of building construction, through continuous downward movement of material pressing assemblies, the height of two material pressing assemblies can be adaptively adjusted according to the concave-convex structure of the top of a concrete test block; in the process, when one pressing head is pressed, the supporting rod or the hinge rod is extruded, the supporting rod or the hinge rod rotationally connected with the pressing head deflects and pushes the sliding block to slide in the sliding groove, and the sliding block pushes the adjacent hinge rod to deflect in the horizontal moving process. The other one or more pressure heads are synchronously pushed to adjust the height, so that the heights of the pressure heads can be adaptively adjusted according to the inclined, concave-convex or pitted surface shape on the concrete test block, the pressure heads are stably attached to the contact surface of the concrete test block, and the load is prevented from being transmitted only through local high points; the pressure head cannot generate local impact load at the moment of being in contact with the concrete test block, and the accuracy and the reliability of a detection result are improved.

The invention provides an optical lens, which comprises seven lenses in total, and sequentially comprises a first lens with positive focal power, a second lens with negative focal power, a third lens with positive focal power, a fourth lens with negative focal power, a fifth lens with positive focal power and a sixth lens with negative focal power from an object side to an imaging surface, the second lens has positive focal power; the object side surface of the third lens is a concave surface; the object side surface of the fourth lens is a convex surface, and the image side surface of the fourth lens is a convex surface; the fifth lens has negative focal power, and the object side surface of the fifth lens is a concave surface; the sixth lens has positive focal power, and the object side surface of the sixth lens is a convex surface; the seventh lens has negative focal power, and the object side surface of the seventh lens is a concave surface; wherein the curvature radius R1 of the object side surface of the first lens and the curvature radius R2 of the image side surface of the first lens meet the formula: (R1-R2) / (R1 + R2) lt; and 0.6. According to the optical lens provided by the invention, through specific surface shape matching and reasonable focal power distribution, the lens has one or more advantages of long focus, large aperture, high imaging quality and the like.

The invention provides an optical lens, which comprises eight lenses from an object side to an imaging surface along an optical axis: a first lens with negative focal power, a second lens with negative focal power, a third lens with negative focal power, a fourth lens with negative focal power, a fifth lens with negative focal power and a sixth lens with negative focal power, the image side surface of the second lens is a concave surface; the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a concave surface; the image side surface of the fourth lens is a convex surface; the object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a convex surface; the object side surface of the sixth lens is a concave surface, and the image side surface of the sixth lens is a concave surface; the object side surface of the seventh lens is a convex surface, and the image side surface of the seventh lens is a convex surface; and the eighth lens has negative focal power. According to the optical lens provided by the invention, through specific surface shape matching and reasonable focal power distribution, the lens has one or more advantages of ultra-wide angle, high pixel, large aperture, small distortion, high imaging quality and the like.

The invention discloses plastic product ultrasonic welding equipment, and relates to the technical field of plastic ultrasonic welding, the plastic product ultrasonic welding equipment comprises a workbench, the top of the workbench is connected with a welding machine assembly through a lifting module, the welding machine assembly comprises an amplitude-change pole, the upper end of the amplitude-change pole is provided with an energy converter, the top of the workbench is provided with a mold assembly, and the mold assembly is connected with the workbench. The die assembly comprises a hollow lower die and a hollow upper die, and the upper die is fixedly connected to the lower end of the amplitude-change pole. According to the ultrasonic welding equipment for the plastic products, during ultrasonic welding, the lower die and the upper die can be adaptively adjusted according to the surface shape of a workpiece, the workpiece is limited, meanwhile, the workpiece can be subjected to negative pressure adsorption, the ultrasonic welding equipment is more stable and reliable, the dies do not need to be replaced, and the workpiece does not need to be centered; the ultrasonic welding efficiency can be improved; and after ultrasonic welding is completed, the ultrasonic welding strength of the plastic product can be conveniently detected, and the ultrasonic welding quality is guaranteed.

The invention relates to the technical field of optical element machining, in particular to an HUD free-form surface mirror machining method which comprises the following steps of S1, substrate selection and cutting, S2, edge treatment, S3, first-stage hot bending forming, S4, second-stage hot bending forming and S5, grinding. According to the machining method disclosed by the invention, through cooperative use of the first-stage hot bending forming and the second-stage hot bending forming, machining operation of the free-form surface mirror with the large size, the large curvature and the small thickness can be achieved; meanwhile, through the two-stage hot bending forming process, primary forming is conducted through first-stage hot bending forming, pressure maintaining is conducted near a softening point through second-stage hot bending forming, the glass is evenly heated and stressed, residual stress is effectively released, the surface type is promoted to present an ideal gradual change trend, edge distortion is greatly reduced, and the high-precision surface type of the final curved mirror is ensured.

The invention provides an aviation composite thin-wall curved surface structure flexible positioning adjustment compensation amount optimization design method and system, and the method comprises the steps: S1, obtaining the actual manufacturing and assembly state information of an aviation composite thin-wall curved surface part, and expressing the distribution state and geometric continuity of part errors; s2, establishing an assembly deviation calculation model considering the flexible positioning adjustment compensation amount, and predicting a curved surface appearance assembly precision value; s3, establishing a curved surface profile assembly precision prediction model; s4, acquiring an optimal positioning compensation amount set at a plurality of positioning execution tail ends on the tool; and S5, expressing and displaying the correlation and the distribution statistics rule among the positioning errors at the multi-positioning execution tail end of the tool. According to the method, the actual manufacturing / assembling state of the large-scale low-precision composite curved surface structural part is considered, an optimization method driven by force position actual measurement data is adopted, personalized calculation and active adaptive shape adjustment of the flexible assembling and adjusting compensation amount of the tool are achieved, and a foundation is laid for high-precision guarantee of assembling quality and low-stress assembling.

The invention provides an optical lens, which comprises eight lenses from an object side to an imaging surface along an optical axis: a first lens with negative focal power, a second lens with negative focal power, a third lens with negative focal power, a fourth lens with negative focal power, a fifth lens with negative focal power and a sixth lens with negative focal power, the object side surface of the second lens is a concave surface; the object side surface of the third lens is a convex surface; the fourth lens has positive focal power, and the object side surface of the fourth lens is a convex surface; 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 object side surface of the sixth lens is a convex surface, and the image side surface of the sixth lens is a concave surface; the seventh lens has positive focal power, and the object side surface of the seventh lens is a convex surface; the object side surface of the eighth lens is a concave surface, and the image side surface of the eighth lens is a convex surface. According to the optical lens provided by the invention, through specific surface shape matching and reasonable focal power distribution, the lens has one or more advantages of an ultra-wide angle, a large image plane, a large aperture, high imaging quality and the like.

The invention relates to a surface type correction and processing method of an aspherical lens, which comprises the following steps of: changing a radial point location of a polishing disk participating in cutting by adopting a rotary polishing disk and lens tangent layout and through three-axis linkage of numerical control X-axis radial feeding, numerical control B-axis swinging and Z-axis approaching movement, and forming differentiation by utilizing the linear velocity gradient of the disk to remove redundant materials of the lens; and surface shape error differential correction is realized. According to the method, the polishing head does not need to be frequently replaced, over-polishing / under-polishing of traditional air bag polishing is eliminated, and the single-piece machining time is shortened; an air bag structure is omitted, the service life of consumables is prolonged, and batch fluctuation is reduced; accumulative errors are reduced through three-axis linkage, and medium-high frequency ring belt errors are restrained. The matched processing method comprises the steps of initial forming, detection, planning, correction and the like, can be quickly adapted to lenses of multiple specifications, and efficiently completes high-precision batch manufacturing of medium and large-caliber aspheric surfaces.

The invention relates to a measuring arrangement for the interferometric determination of the surface shape of a test object, wherein a test wave generated from electromagnetic radiation and reflected at the test object can be superimposed with a reference wave not reflected at the test object, with a reference element (110, 210, 310, 410) having a reference surface (112, 212, 312, 412) which, in the optical beam path, splits off the reference wave from the test wave before it strikes the test object (120, 220, 320, 420) by reflection, and at least one beam shaping surface (111, 211, 311, 411, 413, 414) located in the optical beam path in front of the reference surface, wherein this beam shaping surface is designed as an aspherical distortion correction surface such that a distortion occurring in a predetermined reference plane of the measuring arrangement is reduced. The invention further relates to a method for manufacturing an optical element for such a measuring arrangement.

The invention provides an optical lens, which consists of four lenses, and sequentially comprises a first lens with negative focal power, a second lens with negative focal power, a third lens with negative focal power, a fourth lens with negative focal power and a fifth lens with negative focal power from an object side to an imaging surface along an optical axis, the image side surface of the second lens is a convex surface; the third lens has positive focal power, and the image side surface of the third lens is a convex surface; the image side surface of the fourth lens is a convex surface; wherein the effective focal length f of the optical lens and the focal length f1 of the first lens meet the following conditions:-7.8 lt; f1 / flt; and-3.5. According to the optical lens provided by the invention, through specific surface shape matching and reasonable focal power distribution, the imaging quality of the optical lens can be improved, the aberration can be reduced, and the imaging quality of the optical lens can be improved.

In a method for the interferometric determination of the shape of a freeform optical surface of a test specimen using an interferometer, the specimen is successively positioned in different measurement positions. These positions include a nominal position and a multitude of non-nominal positions that deviate from it, each of which can be described by a change in position relative to the nominal position. An interferogram is recorded in each measurement position, and phase information derived from the interferogram is evaluated to determine the surface shape. An interferometer error tilt sensitivity is determined by means of position changes in the form of tilts. A shear of the surface form error is determined by means of position changes in the form of displacements. Through integration, the surface form error, and consequently the interferometer error, can be determined.