1409 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 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 positive focal power and a fifth 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 concave surface; 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 near the optical axis is a convex surface; and the object side surface of the seventh lens is a concave surface near the optical axis, and the image side surface of the seventh 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 imaging quality of the optical lens is improved, and the lens has one or more advantages of ultra wide angle, ultra large aperture, large image plane, high pixel, high imaging quality and the like.

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 belongs to the technical field of precision machining equipment, and discloses a partitioned and deformation-controllable precision polishing grinding head which comprises a partitioned base, a positioning block is arranged in the center of the lower portion of the partitioned base, at least one connecting rod assembly is arranged above the partitioned base, and the top end of each connecting rod assembly is connected with a curvature adjusting head. A flexible polishing head is arranged above the curvature adjusting head, a protective shell is arranged on the outer side of the connecting rod assembly, the flexible polishing head and the protective shell are connected through a grinding head frame, and the whole device is provided with a drive circuit. According to the precise polishing grinding head capable of being partitioned and deformed controllably, through the partitioned base and the independent shape memory alloy driver, the curvature radiuses of the center and the edge of the flexible polishing head are controlled, the edge pressure is optimized, stable contact rigidity and uniform pressure distribution are brought, and finer surface shape control is achieved; the shape memory alloy driver is a solid-state element and is matched with the transverse amplification connecting rod, and needed driving force and displacement can be achieved in a relatively compact space.

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, and the image side surface of the second lens is a convex 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 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 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 object 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 lens has one or more advantages of large aperture, large field angle, good resolution, high illumination, high imaging quality and the like.

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 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, and the image side surface of the second lens is a convex 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 and the image side surface of the fourth lens are convex surfaces; 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 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 curvature radius R9 of the object side surface of the fifth lens and the curvature radius R10 of the image side surface of the fifth lens meet the formula:-0.85 lt; (R9-R10) / (R9 + R10) lt; and-0.4. 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 a large field angle, a large target surface, a large aperture, high imaging quality and the like.

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 discloses a transparent object surface defect detection method based on transmission structured light. The method sequentially comprises the following steps: establishing a measurement system; generating a stripe image; a vertical deformation fringe pattern and a horizontal deformation fringe pattern are collected and demodulated, and a vertical unwrapping phase and a horizontal unwrapping phase of the transparent glass plate to be detected are obtained respectively; according to the vertical unwrapping phase and the horizontal unwrapping phase, the surface scratch area and the flatness error of the transparent glass plate to be detected are obtained; judging whether the transparent glass plate to be detected meets the requirements or not according to the two indexes of the surface scratch area and the flatness error: when the two indexes meet the respective requirements, judging that the transparent glass plate to be detected is qualified and meets the requirements. Under the condition that calibration is not needed, the surface shape error is detected through the transmission-type phase deflection measurement system, the detection rate is increased, the system is simplified, and comprehensive detection of the surface shape error and the surface defect is achieved.

The invention discloses a magneto-rheological polishing angle calculation method, system and device and a medium. According to the method, a polishing angle population of a magneto-rheological removal function is constructed, and the polishing angle population comprises a plurality of polishing angles generated randomly; a magneto-rheological removal function is calculated, and according to each polishing angle in the polishing angle population, the residual surface shape error and the correction capability spectrum of the to-be-machined element are machined; based on the residual surface shape error and the line correction capability spectrum of each polishing angle, performing crossover variation on the polishing angle population to obtain a next generation population, and performing loop iteration until a preset iteration condition is met to obtain an optimal polishing angle; and for each polishing angle in the polishing angle population in iteration, executing the following steps: calculating a residual surface shape error corresponding to the to-be-processed element processed by the magneto-rheological removal function according to the polishing angle, and obtaining a residual surface shape error root mean square of the corresponding polishing angle according to the residual surface shape error, and the modification capacity of the magnetorheological polishing technology can be improved by adjusting the removal function polishing angle.

The invention provides an ion beam polishing multi-working-condition removal function obtaining method which comprises the steps that according to a to-be-machined optical surface shape and a planned movement track of an ion source relative surface shape, the change range of an ion beam incident angle and the change range of a machining distance in a polishing machining task are determined; carrying out limited times of single-point etching experiments, and detecting the surface shape of the workpiece after the single-point etching experiments; calculating a processing amount distribution, and calculating a removal function considering the incident angle of the ion beam and the processing distance based on the processing amount distribution data and the processing time; training an artificial neural network by taking the removal function as training data; and on the basis of the trained neural network, obtaining a removal function fitting parameter pair according to the actual processing task requirement, and performing inverse processing on the removal function fitting parameter pair to obtain a removal function of the actual processing point. According to the removal function obtained through the method, the influence under multiple working conditions is considered, and the current high-precision machining requirement for the high surface slope or various non-planar optical surface shapes can be better met.

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 discloses an endoscope optical system which is composed of a first lens, a steering prism, a diaphragm, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and a beam splitter prism from an object plane to an image plane, the focal power of the first lens is negative, the object side is a convex surface, and the image side is a concave surface; the focal power of the second lens is positive, the object side is a plane, and the image side is a convex surface; the object side of the third lens is a convex surface, the focal power of the fourth lens is opposite to that of the third lens, and the image side is a convex surface; the focal power of the fifth lens is positive, and the image side of the fifth lens is a convex surface; the focal power of the sixth lens is negative, the object side is a concave surface, and the image side is a concave surface; the focal power of the seventh lens is positive, the object side is a convex surface, and the image side is a convex surface; the object space numerical aperture NA of the endoscope optical system is more than 0.001 and less than 0.006, and the endoscope optical system has the advantages that lens combinations with different surface shapes and focal powers are used, and the depth of field and the axial resolution capability of an endoscope are improved by reducing the object space numerical aperture.

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, 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, and the image side surface of the second lens is a convex 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 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 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 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 can be improved, and the optical lens has the advantage of excellent imaging quality.

Disclosed is a manufacturing method for a free toric lens, which improves the degree of freedom through point-by-point optimization of a plurality of meridians with different angles in an entire plane. The manufacturing method includes the following steps: S1: constructing a simplified lens-eye model; and S2: determining a focal power F2 and a curvature radius r20 of a vertex. Free toric coefficients of vertical and horizontal meridians are calculated; then due to the rotation symmetry of the lens, it is only considered that in a first quadrant of a curved surface, and the curved surface shape of a free toric surface is determined according to rise data of each point on the taken meridians, so that the manufactured lens is thinner, and clearer in imaging.

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 belongs to the field of advanced scientific devices integrating optics, quantum mechanics, atomic physics and a vacuum technology, and particularly relates to a glass vacuum cavity and a manufacturing method thereof.The manufacturing method includes the steps that the inner surfaces of window pieces are machined firstly, an inner working face with high surface shape precision can be obtained, and after the inner surfaces are machined, the four window pieces are plated with films, and the working faces are plated with antireflection films; the optical cement surface is plated with an optical cement auxiliary film, and the diffraction film is rubbed after the optical cement surface is plated with the film, so that the optical cement strength is ensured to be optimal. After every two of the four window sheets are subjected to optical cement deepening, the outer surfaces are processed, and when the outer surfaces are processed, the inner surfaces are protected, so that the quality of a film layer is not damaged. By means of the method that optical processing, film coating and optical cement deepening are conducted on the inner surface alternately, and then optical processing, film coating and optical cement deepening are conducted on the outer surface alternately, the glass vacuum cavity which is high in window piece surface shape precision, high in window piece parallel precision, high in combination strength and good in air tightness, and the film layer surface quality is not prone to pollution or damage can be machined.

A robot system according to one aspect of the present disclosure comprises: a model storing unit that stores a workpiece model; a workpiece detecting unit that detects the position and orientation of a workpiece by comparing features of a surface shape measured by a three-dimensional sensor to features of the workpiece model; a workpiece model positioning unit that positions the workpiece model in a virtual space; and a path setting unit that, in the virtual space, sets a removal path so as to move and withdraw the workpiece model that is an object to be removed without interfering with another workpiece model.

A deformable hot-press 3D printing device, characterized by its use for 3D printing, comprises a roller module, a fiber placement module, and at least one nozzle; the fiber placement module is used to lay down a reinforcement material; the at least one nozzle evenly sprays a base material onto the reinforcement material; the roller module includes a deformable unit, whose deformation and temperature are controlled by a computing unit to compress the composite material formed by the nozzle and the fiber placement module into various shapes. This invention addresses the problems of prior art in being unable to print concave and convex surfaces, control product surface shape, and achieve printing of thermosetting composite materials.

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 in total, and sequentially comprises a front group with negative focal power and a rear group with positive focal power from an object side to an imaging surface along an optical axis, the front group sequentially comprises a first lens with negative focal power from the object side to the imaging surface along the optical axis, 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 object side surface of the second lens is a concave surface, and the image side surface of the second lens is a convex surface; the rear group sequentially comprises a third lens with positive focal power, a fourth lens with negative focal power and a fifth lens with positive focal power from the object side to the imaging surface along the optical axis; 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 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 imaging quality of the optical lens can be improved, and the optical lens has the advantage of excellent imaging quality.

The invention relates to the technical field of surface shape detection, in particular to an optical element surface shape frequency band error division method based on data driving, which comprises the following steps: S1, acquiring surface shape detection results of different optical elements, and extracting corresponding full-frequency band errors from the surface shape detection results, training the three error extraction neural networks by taking each surface shape detection result and the corresponding full-band error as a training data set; s2, inputting a surface shape detection result of the to-be-detected optical element into the three error extraction neural networks which finish training, and respectively extracting each frequency band error of the surface shape of the to-be-detected optical element through the three error extraction neural networks; s3, respectively carrying out one-dimensional PSD curve calculation on the surface shape detection result and the corresponding frequency band error; and S4, comparing the two one-dimensional PSD curves, wherein a frequency point at a non-overlapping position is a demarcation point between the two frequency band errors. The frequency band error division method has universality, can be suitable for different wave bands, and is high in accuracy.

The invention relates to the technical field of photoetching, in particular to a silicon wafer surface shape scanning method and device and electronic equipment.The method comprises the steps that the edge of a silicon wafer is scanned according to a preset scanning path, and discrete height information of the edge of the silicon wafer is obtained; curved surface fitting is carried out on the discrete height information of the silicon wafer edge to obtain a fitting model of the height and the position of the silicon wafer edge, and the fitting model can obtain the accurate height of the silicon wafer edge; according to the fitting model, resolving the position corresponding to the entrance point on the preset global scanning path to obtain an estimated attitude value of the entrance point; and controlling the silicon wafer stage to move until the silicon wafer is in the effective measurement interval of the horizontal sensor according to the estimated attitude value before entering the silicon wafer from the entrance point, so that the situation that capturing operation is needed when the scanning light spot of the horizontal sensor enters the field in the global scanning process is avoided. Therefore, the global scanning efficiency is improved.