601 results about "Surface shape" patented technology

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 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 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.

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 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 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.

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.

The invention relates to the technical field of machine tool machining, and discloses an off-axis aspherical mirror polishing method, device and equipment and a storage medium, and the method comprises the steps: building a female aspherical geometric model, and dividing an off-axis region based on the female aspherical geometric model and a preset design requirement; performing trajectory planning based on the off-axis region to obtain a polishing path; constructing a removal function model based on the off-axis region; obtaining a surface shape residual error from the off-axis aspherical mirror to be polished, and solving and obtaining residence time based on the removal function model, the surface shape residual error and the polishing path; constructing a five-axis machine tool kinematic model; the residence time and the polishing path are substituted into the five-axis machine tool kinematic model to obtain polishing control parameters; through the process design of off-axis area positioning, path planning, modeling removal, residence solution and coordinate conversion, stable control over the machining precision of the asymmetric structure of the off-axis aspherical mirror is achieved, and the high-precision manufacturing requirement of a high-performance optical system for the off-axis aspherical mirror is stably met.

By analyzing the micro-texture of the machined surface, inverse estimation of tool mounting eccentricity is realized on the machine tool. [Solution] Under predetermined workpiece parameters, simulation machining is performed based on multiple parameter sets obtained based on different tool parameters, tool attitude parameter settings, and cutting parameters, and the surface shape after machining for each parameter set is obtained. An optimization variable set is constructed based on each parameter set, and the optimization variable set when waviness is most sensitive to changes in tool mounting eccentricity is determined. The tool mounting eccentricity during machining of the workpiece sample is calculated using the constructed relationship between the tool mounting error and the peak-to-peak value of waviness. If the tool mounting eccentricity exceeds the predetermined value, the bull nose end mill is reattached and the workpiece sample is replaced so that the workpiece can be actually machined, and this calculation of tool mounting eccentricity is repeated until the tool mounting eccentricity becomes smaller than the predetermined value.

The invention relates to an interferometric testing arrangement for testing the surface shape of a test object, comprising a lighting device (105, 205, 305) for generating an input wave from electromagnetic radiation produced by a light source and an interferometer (150) in which, after splitting the input wave into at least one test wave directed towards the test object (170) and a reference wave, testing the surface shape of at least a partial surface of the test object (170) can be carried out by interferometric superposition of the at least one test wave and the reference wave, wherein a diffuser (130, 230, 330) is arranged in the lighting device, wherein the lighting device has a first optical path (110, 210, 310) and a separate second optical path (120, 220, 320), and wherein the input wave is transmitted via both the first optical path (110, 210, 310) and the second optical path (120, 220, 320). 220,320) can be coupled into the interferometer (150).

To provide a method and a device for smoothing a work by which the working time of finish flattening is drastically shortened by predicting stress deformation in advance and roughly working the work into a shape corresponding to a finish shape in advance in a working method for smoothing the work in which the stress deformation is caused, especially the work having a bimetal structure in which thermal stress deformation is caused by temperature rise.SOLUTION: The method includes a first machining process for locally machining the surface of the workpiece based on machining data, and a second machining process which is performed after the first machining process and has a machining mechanism for preferentially removing a contact part between a machining pad having a planar machining reference surface and the workpiece, wherein stress deformation of the workpiece at the time of machining in the second machining process is predicted, and machining data of the first machining process is created from a difference between a predicted surface shape 4 at deformation and a predicted finished surface shape 5 or a difference between a final finished surface shape 7 and the pre-machining surface shape 6.SELECTED DRAWING: Figure 1

The present application relates to the technical field of image recognition, and more particularly to a concrete prefabricated component surface defect detection method and system, which comprises the following steps: obtaining a shading vector of each pixel point based on a multi-angle image sequence; weighting and normalizing the shading vector by using a weight coefficient positively correlated with the zenith angle of a light source to obtain a light resistance amount; calculating the spatial gradient feature of the light resistance amount, and combining a geometric correction factor based on a local surface shape and an albedo correction factor to perform weighted fusion to obtain a steepness index; calculating the centripetal closeness of the light resistance amount gradient, fusing the same with the steepness index to generate a confidence index, and determining a defect region according to the confidence index. The present application can accurately distinguish between shallow pores, color spots and deep structural defects with steep and closed edges by constructing a light resistance amount and fusing multi-dimensional geometric features.

The present application relates to the technical field of optical aspheric surface, especially points to a kind of free curved surface characterization method based on CGH lens zero position compensation detection optical path, with the detection of free curved surface as the guide, based on zero position compensation detection principle, according to ray tracing method, Snell's law, diffraction principle and equal optical path principle, using the parameters required by interferometer incident wave front as plane wave, compensator as single CGH lens zero position compensation detection system indirectly characterizes free curved surface shape, by using XY polynomial and Zernike standard phase polynomial, the mathematical description of free curved surface is realized in design stage can determine its measurement scheme, and according to the characterization method self-defined a kind of aspheric surface type, called zero position free curved surface.The free curved surface characterization method improves the degree of freedom of free curved surface shape and the feasibility of zero position compensation method, reduces the detection difficulty of free curved surface shape, realizes the function of zero position free curved surface design can be detected.

The application provides an optical lens, which comprises seven lenses in sequence along an optical axis from an object side to an imaging surface, and the seven lenses comprise: a first lens with negative optical power, wherein 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; a second lens with negative optical power; a third lens with positive optical power; a fourth lens with negative optical power; a fifth lens with positive optical power, wherein the image side surface of the fifth lens is a convex surface; a sixth lens with positive optical power; and a seventh lens with negative optical power; the sixth lens has a meniscus shape; the curvature radius R11 of the object side surface of the sixth lens and the curvature radius R12 of the image side surface of the sixth lens satisfy: -0.99 <= (R11-R12) / (R11+R12) <= 0.97. The optical lens has a large field of view and high resolving power, has good imaging quality, and has clear imaging of the edge field of view through reasonable configuration of the surface shape of each lens and reasonable matching of the optical power.

This invention provides an iterative measurement device and method for the surface shape of a cylindrical axially stressed component, belonging to the field of component measurement technology. It solves the problems of low measurement accuracy, single measurement method, low algorithm efficiency, and insufficient precision of existing measurement devices. This measurement device can detect the perpendicularity of the cylindrical axially stressed component, ensuring its vertical placement. It can stably adjust the height of the probe detection mechanism and the laser measurement mechanism, maintaining stable positions without wobbling, thus satisfying the requirement of measuring the outer contour of the cylindrical axially stressed component's surface twice. By controlling the main unit in conjunction with the probe detection mechanism and the laser measurement mechanism, it achieves rapid and accurate measurement of the cylindrical axially stressed component's appearance shape. The measurement method of this invention does not cause errors in the measured specimen's appearance due to the irregular shape of the track itself. Utilizing an iterative algorithm, it can achieve precise measurement of the appearance of the cylindrical axially stressed component and the track.

The invention relates to the technical field of curved surface precision detection, in particular to a large curved surface shape precision detection device which comprises a frame, a position adjusting mechanism is arranged at the top end of the frame, a main detector is installed at the working end of the position adjusting mechanism, and an auxiliary detection mechanism is arranged at the lower end of the frame. An auxiliary frame is detachably mounted at the bottom end of the main detector, a plurality of magnetic fluid tanks are fixedly mounted on the upper surface of the auxiliary frame at equal angles, a wind scooper is detachably mounted at the lower end of the auxiliary frame, a plurality of air outlet pipes are uniformly distributed around the wind scooper, and the air outlet pipes are connected with an external air pump. Manual intervention is reduced through multifunctional integration, a solution is provided for key problems such as vibration interference, light path pollution and ambient light noise, and detection efficiency, precision and environmental adaptability are comprehensively improved.

The application provides an optical lens, which comprises seven lenses in sequence along an optical axis from an object side to an imaging surface, and the seven lenses comprise: a first lens with negative optical power, wherein the object side surface is a concave surface and the image side surface is a concave surface; a second lens with negative optical power, wherein the object side surface is a concave surface and the image side surface is a convex surface; a third lens with positive optical power, wherein the object side surface is a convex surface and the image side surface is a concave surface; a fourth lens with positive optical power, wherein the object side surface is a convex surface and the image side surface is a convex surface; a fifth lens with positive optical power, wherein the object side surface is a convex surface and the image side surface is a convex surface; a sixth lens with negative optical power, wherein the object side surface is a concave surface; and a seventh lens with positive optical power, wherein the object side surface is a convex surface near the optical axis and the image side surface is a concave surface near the optical axis. The optical lens provided by the application has one or more advantages of miniaturization, large aperture, large image height, large field of view, high pixel, high imaging quality and the like through specific surface shape matching and reasonable optical power distribution.

The present application relates to large aperture optical machine structure engineering analysis technical field, especially to a kind of gravity unloading point layout method of large space mirror, comprising the following steps: S1: the finite element analysis model of space mirror is established, and the discrete node surface shape data and unloadable point coordinate data are exported.S2: surface shape fitting is carried out, and surface shape accuracy is calculated.S3: its surface shape residual elevation diagram is drawn, and high residual point is identified.S4: the unloadable point coordinate of space mirror is obtained.S5: space mirror is supported using unloadable point, and its degree of freedom is constrained;Finite element analysis model is updated, and step S2 is repeated, and surface shape accuracy is calculated.S6: whether surface shape accuracy meets the requirements is judged, if not, then repeat step S3 to step S5;Until meet the requirements.The present application has the advantages that, through the gravity unloading point layout of space mirror, gravity unloading point can be more accurately fixed in flexible support mode or the like during processing, and the influence of gravity on surface shape accuracy is reduced.

The application provides an optical lens, which comprises seven lenses in sequence along an optical axis from an object side to an imaging surface, and the seven lenses comprise: a first lens with negative optical power, wherein the object side surface of the first lens is a concave surface, and the image side surface of the first lens is a concave surface; a second lens with negative optical power, wherein 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; a third lens with positive optical power, wherein the object side surface of the third lens is a convex surface; a fourth lens with positive optical power, wherein 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; a fifth lens with positive optical power, wherein 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; a sixth lens with negative optical power, wherein the object side surface of the sixth lens is a concave surface; and a seventh lens with positive optical power; and the total optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy 4.9 < TTL / f < 5.2. The optical lens provided by the application has one or more advantages of miniaturization, large aperture, large image height, large field of view, high pixel, high imaging quality and the like through specific surface shape matching and reasonable optical power distribution.

This utility model provides a flanging device for product flanging, comprising: an upper mold and a lower mold. The upper mold is provided with an adjacent pressure block and a side pressure block. The side pressure block has a first guide surface on the side facing the pressure block, and a first side forming surface on the side of the pressure block near the side pressure block. The lower mold is provided with an adjacent flanging part and a slider assembly. The slider assembly has a second guide surface on the side away from the flanging part, and a second side forming surface on the side of the slider assembly near the flanging part. The side pressure block drives the slider assembly to reciprocate between a separation position and a forming position through the first guide surface and the second guide surface. The beneficial effects of this utility model include at least the following: when the upper mold is driven to move downward, the pressure block contacts the flanging part to form the product to be processed, and the first side forming surface and the second side forming surface shape the side of the product to be processed, thereby simultaneously achieving the front forming and side shaping of the product to be processed.

Provided is a printing device capable of suppressing peeling failure of a label and smoothly conveying the label. A rib portion (46) continuously has, from an upstream side of a lower side in a vertical direction toward a downstream side of an upper side in the vertical direction, a first rib (47) having a first surface (47a), a second rib (48) having a second surface (48a), and a third rib (49) having a third surface (49a). The first surface (47a) of the first rib (47) is inclined in a direction that moves away from a first imaginary straight line (L1) (refer to an end surface shape of FIG. 5) that links an outer peripheral surface of a peeling portion (52) and the second surface (48a) of the second rib (48) as further going to an upstream side in the vertical direction from an end portion of the second surface (48a) of the second rib (48) on the upstream side in the vertical direction. The third surface (49a) of the third rib (49) is inclined in a direction that moves away from the first imaginary straight line as further going to a downstream side in the vertical direction from an end portion of the second surface (48a) of the second rib (48) on the downstream side in the vertical direction.

The application belongs to the technical field of laser optics, and particularly relates to a heat distortion resistant mirror seat for a high-power laser system; the mirror seat comprises a seat body, a plurality of convex bosses for limiting a mirror are arranged on the inner side wall of the seat body, a contact plate for bearing the mirror is arranged in the frame of the seat body, a group of heat dissipation fins are arranged on the bottom of the contact plate, flexible grooves and threaded holes are respectively arranged in the frame of the seat body at positions corresponding to the convex bosses, a flexible pressing ring is fixed to the top end of the seat body through the threaded holes and is used for pressing the mirror, mounting holes corresponding to the threaded holes are arranged on the flexible pressing ring, and a flexible groove of the pressing ring is arranged on the inner side of each mounting hole; the application is suitable for the working condition that the temperature of the mirror continuously rises, can effectively reduce the temperature level of the mirror, and effectively solves the mirror surface shape distortion problem caused by the fact that the mirror seat extrudes the mirror due to the mismatch of the thermal expansion coefficients of the mirror seat and the mirror.

The application discloses an axial support and positioning system for an optical mirror, wherein a plurality of groups of seesaw self-balancing axial support mechanisms are arranged between the optical mirror and a base frame, the main body of the seesaw self-balancing axial support mechanism is a polygonal seesaw, one side of each corner point position of the seesaw is connected with the optical mirror through a first hinge, the other side of each corner point position of the seesaw is connected with a force actuator integrated with a force sensor through a second hinge, each force actuator can independently output a correction force, and the middle part of the seesaw is connected with the base frame through a third hinge. The application fully utilizes the advantages of the seesaw self-balancing axial support system, completely unloads the mirror weight and rigidly positions the mirror, so that the output force of the force actuator can be entirely used for correction of the mirror surface shape or generation of a required surface shape, and real-time active correction can be performed on the mirror surface shape and even the performance of the whole optical system.

The application discloses a kind of based on double model representation's aspheric surface parameter fitting and surface shape deviation measurement method, comprising 1) collection aspheric surface optical element surface several points, processing obtains the three-dimensional data of each sampling point;2) establish initial optical path model and set its wavefront evaluation function;3) input aspheric element's design parameter in turn;4) by the coordinate data of measured XOY plane is fitted to obtain the coordinate of its center point, conversion to the coordinate system of with optical design software coaxial, carries out Zernike fitting and obtains Zernike coefficient;5) in aspheric surface optical path model, using Zernike coefficient in step 4 is represented to be measured aspheric surface, in the same optical design software, constructs aspheric surface using two kinds of representation mode;6) radius of curvature is set as variable, the rest aspheric surface parameters are unchanged, and optimization obtains actual radius of curvature;7) conic coefficient and high order coefficient are set as variable, and optimization obtains aspheric surface parameter and surface shape deviation.

The invention relates to the technical field of ultra-precision optical manufacturing, in particular to a fast tool planing method for a micro-lens array, a medium and equipment. The method comprises the steps that a non-interference feasible planing tool is determined according to surface shape data of a micro lens array to be machined; building a parameter physical model of planing fundamental frequency, surface roughness and single unit machining duration based on micro lens unit parameters, cutter parameters and machining parameters; by taking a parameter limiting condition as a nonlinear constraint and the total processing duration as a target function, optimizing and solving fs, Rt, DL and fx to obtain the shortest processing duration; and finishing machining by adopting optimized parameters. According to the method, a multi-physical parameter model is innovatively constructed, collaborative optimization of optical performance (surface shape), process capability (roughness and dynamic characteristics) and manufacturing efficiency (processing time) is realized, nanoscale roughness and dynamic stability are ensured, a large-scale array processing period is remarkably shortened, and an efficient path is provided for batch manufacturing of ultra-precise optical elements.

The utility model relates to the technical field of bulletproof glass production, in particular to a bulletproof glass lamination processing device, which comprises a lower lamination die and an upper lamination die positioned above the lower lamination die, and further comprises the structure that the upper lamination die can slide up and down relative to the lower lamination die so as to adjust the distance between the upper lamination die and the lower lamination die; a plurality of unit supporting mechanisms which are uniformly distributed are arranged in the middle of the lower laminating mold and the middle of the upper laminating mold, and each unit supporting mechanism comprises a telescopic guide sleeve and a telescopic jacking column which is arranged on the inner side of the telescopic guide sleeve in an embedded and sliding manner. By adjusting the length of the telescopic jacking column and the angle of the jacking plate of the unit supporting mechanism, supporting structures with various curved surface shapes can be rapidly constructed, the adaptability of equipment to different product specifications is greatly improved, the requirement for die replacement is reduced, a corresponding die does not need to be specially manufactured for each different curved surface shape, and the production cost is reduced. And the production preparation cost and time are greatly reduced.

A surface shape measuring apparatus for measuring a specular surface includes an illuminator configured to illuminate the specular surface with a first light pattern, an imaging device configured to capture an image of a second light pattern which is light transmitted through the illuminator after the first light pattern from the illuminator is reflected by the specular surface, and a processing apparatus configured to acquire a positional deviation amount of the second light pattern from a predetermined position in the image captured by the imaging device, and to output information related to a surface shape of the specular surface acquired from the positional deviation amount.

The application provides an optical lens, which comprises seven lenses in sequence along an optical axis from an object side to an imaging surface, and the seven lenses comprise: a first lens with negative optical power, wherein 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; a second lens with negative optical power, wherein the object side surface and the image side surface of the second lens are both concave surfaces; a third lens with positive optical power, wherein the object side surface and the image side surface of the third lens are both convex surfaces; a fourth lens with positive optical power, wherein 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; a fifth lens with positive optical power, wherein 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; a sixth lens with negative optical power, wherein the object side surface and the image side surface of the sixth lens are both concave surfaces; and a seventh lens with positive optical power, wherein the object side surface and the image side surface of the seventh lens are both convex surfaces. The optical lens provided by the application has one or more advantages of a large aperture, a large field of view, high imaging quality and the like through specific surface shape matching and reasonable optical power distribution.

The invention provides an optical lens, which comprises six 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 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 third lens has positive focal power, 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 fifth lens has negative focal power, 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; wherein the real image height IH corresponding to the maximum field angle of the optical lens and the effective focal length f of the optical lens meet the following conditions: 2.1 lt; iH / flt; and 2.6. 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 ultra-wide angle, high pixel, large aperture, small distortion, high imaging quality and the like.