2887 results about "Focal length" patented technology

The invention discloses an intelligent steel pipe surface defect recognition system based on deep learning, and particularly relates to the technical field of pipe surface defect analysis. An annular polarization light source array and a high-frame-rate CMOS sensor are adopted to synchronously collect visible light and near-infrared multi-polarization images; a surface normal is calculated based on Stokes parameters, mirror surface suppression and diffuse reflection enhancement are realized, a defect candidate area is generated by fusing multi-scale Laplacian pyramid residual error and Renyi entropy segmentation threshold positioning, multi-physical quantity registration is completed through white light interference and infrared thermal imaging, a six-channel feature cube is constructed, and a three-dimensional image is obtained. According to the method, space, spectrum and thermal characteristics are jointly extracted in the multi-head attention convolutional neural network, the confidence coefficient is evaluated in combination with Jensen-Shannon divergence, and the polarization angle and the focal length are dynamically adjusted according to the confidence coefficient, so that closed-loop parameter self-optimization is realized, and the micro-scale pitting corrosion and millimeter-scale crack detection precision is remarkably improved.

A pest control system is disclosed comprising an optical, computational, and monitoring subsystem, optionally mounted on a mobile platform. The optical system may include a neutralizing laser or multi-wavelength light source, discovery and detail cameras (optionally stereo), a beam-steering mechanism, tunable focus, and optional thermal or depth sensors. The processor, such as a GPU or FPGA, identifies insect or biological targets, adjusts laser focus by depth, and controls beam activation. A monitoring system verifies safety by detecting humans or other non-target entities using environmental and thermal cameras; if detected, laser firing is inhibited. The mobile platform may use wheels, propellers, tracks, or cables, with GPS and data links for remote control. A visible light pre-flash may induce a blink reflex before firing. In some embodiments, a scouting drone transmits target coordinates to the neutralization unit, enabling coordinated, efficient, and safe laser-based pest control.

The invention provides a microscopic automatic focusing method and system based on image gray histogram characteristics, and the method comprises the steps: collecting an image sequence under different focal lengths, carrying out the fuzzy processing, extracting a gray histogram of each frame of image, and calculating the peak position and full width at half maximum of the histogram as the evaluation characteristics of the image definition; calculating the variance of each feature and automatically allocating a weight according to the relative response degree; and finally, comprehensively evaluating the image definition through a weighted definition scoring function, and selecting the focal length corresponding to the image with the optimal score as the optimal focusing position. The method is based on the global features of the gray histogram, is high in anti-noise capability, is adaptive to different imaging scenes through weight adaptive adjustment, is low in calculation complexity, supports real-time focusing, is especially suitable for high-noise fluorescence microscopic imaging scenes, is high in system portability, is low in operation threshold, and effectively improves the accuracy and stability of microscopic automatic focusing.

The application relates to the technical field of optical lenses, and provides an optical lens, a camera module and electronic equipment, which can solve the problem that the camera module occupies a large space and causes the thickness of the electronic equipment to be large in related technologies. The optical lens comprises a front lens group, a first turning element, a first rear lens group and a second rear lens group; the front lens group comprises a first front lens group and a second front lens group; when the first turning element is located at a first position, the first turning element is located on the image side of the first front lens group and is used for reflecting the outgoing light beam of the first front lens group to the first rear lens group, and the optical lens has a first effective focal length; when the first turning element is located at a second position, the first turning element is located on the image side of the second front lens group and is used for reflecting the outgoing light beam of the second front lens group to the first rear lens group, and the optical lens has a second effective focal length F2, and the second effective focal length is greater than the first effective focal length F1. The application can be used on electronic equipment such as mobile phones.

The present invention provides an automatic focusing method, an electronic device, and a readable storage medium. The automatic focusing method comprises: using a target detection model to detect a target object in an image frame acquired at an initial focal length by an optical imaging device to be focused, so as to acquire a target object detection result; on the basis of the target object detection result, determining whether a target object is present in the image frame; if yes, determining an actual object distance on the basis of the target object detection result and the initial focal length, and on the basis of the actual object distance and a mapping relationship between the object distance and an optimal imaging focal length, determining the optimal imaging focal length; and if not, using a preset search algorithm to search for a focal length until an image having the highest definition value is found, and using a focal length corresponding to the image having the highest definition value as the optimal imaging focal length. The present invention primarily employs a deep learning-based automatic focusing method, supplemented by an image definition evaluation method. Compared with traditional passive focusing methods, the present invention greatly improves the focusing efficiency. Compared with traditional active focusing methods, the present invention eliminates a need for adding an additional optical ranging component, ensuring that the imaging device has a simple structure and a low cost.

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.

According to the infrared fast patrol method based on task sequence control provided by the invention, the robot is guided to pre-adjust the pan-tilt angle and the infrared focal length during advancing through task sequence planning, and the target is intelligently positioned by synchronously utilizing the equipment template library, so that continuous temperature measurement during movement is realized; performing multi-view infrared image comparative analysis on the temperature exceeding equipment through a multi-angle abnormity rechecking strategy; abnormal equipment outside a preset point location is positioned in real time in combination with a laser point cloud map and space coordinate conversion, the parking time of the robot is eliminated, the temperature measurement efficiency is improved, environmental interference is effectively eliminated, the misjudgment rate is reduced, and a high-timeliness and high-reliability global temperature monitoring defense line is constructed for safe operation of industrial equipment.

The invention discloses a low-profile dual-circularly polarized wave beam scanning folding reflection array antenna. The low-profile dual-circularly polarized wave beam scanning folding reflective array antenna comprises a lower reflective array antenna and an upper circularly polarized selection metasurface. A circular polarization plane feed source is integrated in the middle of the reflective array antenna, and beam deflection is achieved. The circular polarization selection metasurface introduces opposite phase gradients to a left-hand circular polarization wave beam and a right-hand circular polarization wave beam through spin decoupling, and then introduces opposite wave beam deflection angles. Meanwhile, due to the polarization selection function of the circular polarization selection metasurface, the profile height of the antenna is half of the focal length of a traditional reflective array. By rotating the lower-layer reflective array antenna and the upper-layer circular polarization selection metasurface, the antenna can realize simultaneous + / -42-degree pitch angle scanning and 360-degree azimuth angle scanning of left-hand circular polarization and right-hand circular polarization dual beams, and the aperture efficiency, the axial ratio, the scanning loss and other performances are good. The low-profile dual-circularly-polarized wave beam scanning folding reflection array antenna provided by the invention can realize simultaneous scanning of two circularly-polarized wave beams, and is low in profile, compact in structure, low in cost and novel in function.

The device comprises a box body and a measuring assembly arranged in the box body, the measuring assembly comprises a laser emitting unit, a lens unit, a focal length adjusting unit and a height adjusting unit, the height adjusting unit is arranged on the upper side in the box body, and the focal length adjusting unit is arranged at the bottom of the height adjusting unit. The laser emitting unit is arranged at the bottom of the focal length adjusting unit, and the lens unit is arranged at the bottom of the focal length adjusting unit and located on one side of the laser emitting unit. Through the collaborative design of the convex lens and the laser emission unit, the optical path reversibility principle of the convex lens is utilized, and dependence on a small-size and low-emission-port-height special-specification laser emitter is not needed. Even if a laser transmitter with a conventional size is adopted, refracted laser can be infinitely close to the ground, and tiny protrusions can be accurately recognized and measured.

The invention discloses an automatic test method and device based on a camera and an electronic device, and the method comprises the steps: configuring a test environment which comprises an adjustable light source and a standard test graphic card; the brightness and color temperature of the adjustable light source and the focal length and exposure parameters of the to-be-detected camera are automatically adjusted through the control module; controlling the to-be-tested camera to acquire an image of the standard test graphic card, and transmitting the acquired image to an image processing module; the image is analyzed through an image processing module, and the resolution, the color rendition degree, the noise level and the distortion rate are calculated; and generating a test report according to an analysis result, and judging whether the to-be-tested camera is qualified or not. According to the scheme provided by the invention, the adjustable light is automatically controlled to test the camera, the cost of a test task is reduced, the test efficiency is improved, and in addition, the camera test precision is improved through various abundant test conditions.

The invention discloses a compact internal focusing type standard photographic lens and a photographic device. The photographic lens sequentially comprises a first lens group with positive focal power, an aperture diaphragm, a second lens group with positive focal power and a third lens group with negative focal power from an object side to an image side, in the focusing process, the second lens group moves along the optical axis, and the first lens group and the third lens group remain unchanged relative to the position of the image plane. The first lens group, the second lens group and the third lens group satisfy the following conditional expressions: 1 < = F1 / F < = 2; 0.2 < = F2 / F < = 1; -3 < = F3 / F < = 0; wherein F1 represents the composite focal length of the first lens group, F2 represents the composite focal length of the second lens group, F3 represents the composite focal length of the third lens group, and F represents the focal length of the photographic lens. The compact internal focusing type standard photographic lens provided by the technical scheme of the invention is beneficial to optimization of optical performance, focusing mechanism, positive and negative focal power balance and simplification of design and manufacturing of the lens.

The invention provides a projection lens, which comprises five 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 a projection surface to an image source surface along an optical axis, the surface of the projection side of the second lens is a convex surface, and the surface of the image source side of the second lens is a convex surface; the surface of the projection side of the third lens is a concave surface, and the surface of the image source side of the third lens is a concave surface; the surface of the projection side of the fourth lens is a convex surface, and the surface of the image source side of the fourth lens is a convex surface; the surface of the projection side of the fifth lens is a convex surface, and the surface of the image source side of the fifth lens is a convex surface; wherein the real image height IH corresponding to the maximum field angle of the projection lens and the effective focal length f of the projection lens meet the following conditions: 0.6 lt; iH / flt; and 0.8. According to the projection lens provided by the invention, the projection quality of the projection lens is improved through the reasonable configuration of the surface types of the lenses and the reasonable matching of the focal power.

The invention relates to the technical field of optical imaging, and discloses an AR optical projection machine and an optical display system, the projection machine comprises a projection lens group, a color combination prism assembly and a three-color display array; the projection lens group comprises a diaphragm STO, a first lens, a second lens, a third lens and a fourth lens. The color combination prism assembly comprises a plurality of prisms which are glued with one another, and a film coating structure which is used for reflecting red light and blue light and transmitting green light is arranged on each prism; the three-color display array comprises three display chips; wherein the FOV (field of view) of the AR optical projection machine is greater than or equal to 30 degrees and less than or equal to 40 degrees; the ratio of the total optical length TTL of the AR optical projection machine to the effective focal length f of the system meets the condition that TTL / f is larger than or equal to 5.0 and smaller than or equal to 7. The field angle of the system is limited within the range of 30-40 degrees, the ratio of the total optical length TTL to the effective focal length f is kept within 5.0-7.7, an imaging field meeting the AR application requirement can be obtained within the limited optical path length, meanwhile, the overall compactness of the optical system is considered, and the optical system can be more easily integrated into small-size near-to-eye display equipment.

The application provides a camera calibration and zoom tracking method with scene self-adaption, first, according to the actual scene, selecting a suitable target as the calibration point of zoom tracking, obtaining the geographic position information of the calibration point based on 3D-GIS and saving it. Then, for all the calibration points, the camera automatically focuses at different focal lengths, fitting the zoom tracking curve, realizing zoom tracking. Finally, when the application scene changes, repeat the previous two steps, quickly obtain the zoom tracking curve of the current scene. The application uses 3D-GIS data to help the camera to calibrate, quickly obtain the zoom tracking curve under different scenes, improve the precision of zoom tracking, and can be applied to zoom tracking in various scenes.

The invention discloses an integrated galvanometer laser projection method and an integrated galvanometer laser control device. The integrated galvanometer laser projection method comprises the steps that 1, a control card stores various data in a classified mode; when an upper computer issues a system parameter instruction, a communication interface is automatically switched according to a communication mode of the upper computer, and instruction data is analyzed and stored in an EEPROM (Electrically Erasable Programmable Read-Only Memory); 2, after the upper computer issues an instruction, the control card cooperatively controls the on-off state of the laser light source and the deflection angle of the laser galvanometer, and the position and the focal length of the lens are adjusted; 3, positioning an instruction according to a target point of the upper computer; the control card cooperatively controls the laser and the galvanometer to coarsely position the center of the target; and performing fine positioning on the center of the target by taking the target point obtained by coarse positioning as an initial reference position. The integrated galvanometer laser control device has the advantages that the environmental adaptability, the control precision and the operation convenience of the integrated galvanometer laser control device are remarkably improved.

The invention discloses a high-flux zebra fish behavior analysis device and method, and aims to solve the problem of compatibility of plate edge distortion and a multi-type pore plate, a telescopic mechanism is arranged in a shell of the device, an isolation cavity is formed in the shell when the telescopic mechanism is retracted, a micro-lens array and a light filter plate are sequentially arranged in the isolation cavity from top to bottom, and the micro-lens array and the light filter plate are arranged in the shell. A stimulation module is arranged at the bottom of the light filter plate, a pore plate placement area is arranged between the stimulation module and the light filter plate, and a universal adaptive bracket for accommodating a standard pore plate and a non-standard pore plate is arranged in the pore plate placement area; a camera module comprising at least one high-frame-rate camera with a fixed focal length is correspondingly arranged above the porous plate placing area, the camera module is connected with a control and analysis module, distortionless track diagrams, heat diagrams and behavior parameters are output online, and the optical mechanical integrated distortion correction and porous plate combined universal adaptation structure is used for correcting the distortion of the porous plate. When the same set of light path is switched between standard plates and non-standard plates of different models, the distortion of the edge view field is automatically compensated.

The invention discloses a laser projection control method and a distributed control device. The laser projection control method comprises the following steps: step 1, designing a first control board card for galvanometer control; the first control board card comprises a first main control chip for realizing real-time calculation, a static random access memory for external memory expansion, a differential driving chip for transmitting a galvanometer control signal and a chip for realizing an independent communication system; 2, designing a second control board card for laser control, focal length control and temperature monitoring; and the second control board card comprises a second main control chip for realizing real-time calculation, a motor driving chip for driving a motor to move the lens to control the focal length, a laser control circuit amplifier chip and a thermistor. According to the invention, the effect of cooperative control of the laser and the galvanometer is realized.

This application is directed to media content compensation at an electronic device having a head-mounted display. The electronic device determines a multifocal eyewear prescription of a user associated with the electronic device. The multifocal eyewear prescription includes a multifocal parameter for a lens having a plurality of focal lengths. The electronic device obtains input media content, converts the input media content to corrective media content based on the multifocal eyewear prescription of the user, and renders, on the HMD, the corrective media content. In some embodiments, the lens includes a plurality of segments corresponding to the plurality of focal lengths. Each image frame of the input media content is divided into a plurality of regions based on the plurality of segments. The electronic device compensates the plurality of regions of the input media content based on the plurality of focal lengths to generate the corrective media content.

A lighting device for a motor vehicle, in particular a high-definition headlamp, includes an imaging component that has an active surface on which light-emitting diodes or laser diodes are arranged in a matrix to generate pixels in a light distribution in a targeted manner, and a projection lens with which the light emitted from the active surface is projected outward from the motor vehicle when the lighting device is in operation. The lighting device is designed to switch the projection lens from a first setting to a second and from the second setting to the first. The projection lens has a first focal length in the first setting, and a second focal length in the second setting, which is greater than the first focal length.

The invention relates to the technical field of intelligent photography, discloses an intelligent composition auxiliary method and system for tourism photography, and aims to solve the problems that scene semantics cannot be deeply understood and dynamic active composition guidance is difficult to provide in the prior art. The method comprises the following steps: acquiring multi-modal data such as images, geographic coordinates, equipment postures and the like in real time; constructing a scene semantic map for describing visual elements and relationships thereof; outputting a current composition score and an optimization gradient through a pre-trained composition aesthetics quantitative evaluation model; and generating a dynamic visual servo guidance instruction, and superposing the instruction on a view-finding interface in an augmented reality mode to guide a user to adjust the pose and focal length of the camera. The system comprises a multi-modal data acquisition module, a map construction module, an aesthetic evaluation module, a guide generation module and an AR rendering module. According to the method and the device, the crossing from a static reference line to semantization and closed-loop intelligent composition assistance is realized, the operation burden of a user is remarkably reduced, and the imaging aesthetic quality is improved.

The invention discloses a near-to-eye display system based on a short-focus turn-back light path. The near-to-eye display system comprises a curved-surface display screen, a first lens and a second lens which are sequentially arranged from the environment side to the human eye side. Wherein the curved display screen is a transparent display screen; the first lens and the second lens do not have perspective focal power to natural light; the polarizing film systems are arranged on the surfaces of the first lens and the second lens, so that light emitted by a display screen passes through the first lens in a transmission manner, is reflected and amplified twice by the second lens and the first lens in sequence, and finally enters human eyes for imaging; ambient light transmits through the display screen, the first lens and the second lens and enters human eyes for imaging. The near-to-eye display system is realized based on a short-focus turn-back light path and a transparent curved-surface display screen, and can realize augmented reality display with a large field angle.

The invention relates to an optical system. The optical system sequentially comprises a lens group, a diaphragm and an imaging lens from an object side to an image side along an optical axis direction, the lens group comprises a first lens group with positive focal power and a second lens group with positive focal power, the first lens group comprises five lenses, the second lens group comprises at least seven lenses, and the optical system meets the condition that FG1 / f1 is greater than or equal to 1.95 and less than or equal to 7.44; tDG1 / T56 is more than 0.65 and less than 2.00; wherein FG1 is the combined focal length of the first lens group, f1 is the effective focal length of the first lens, TDG1 is the distance from the object side surface of the first lens to the image side surface of the fifth lens on the optical axis, and T56 is the air interval between the fifth lens and the sixth lens on the optical axis.

The invention discloses a system and method for generating, regulating and controlling a partially coherent space-time light field. The system comprises a pulse shaping assembly composed of a plurality of optical elements and an incident light source used for providing a completely coherent ultrafast pulse light field. An optical element in the pulse shaping assembly comprises a first blazed grating, a first cylindrical lens, a two-dimensional dynamic holographic modulator, a second cylindrical lens and a second blazed grating which are sequentially arranged in the light field propagation direction. The focal lengths of the first cylindrical lens and the second cylindrical lens are the same, and the distance between the adjacent optical elements is equal to the focal lengths of the first cylindrical lens and the second cylindrical lens; the two-dimensional dynamic holographic modulator is used for loading a specific complex amplitude modulation function to reconstruct the spatial-spectral characteristics of the light field. According to the invention, the two-dimensional space-spectrum function of the pulse is dynamically modulated, the generation of the partially coherent space-time wave packet is realized, and the amplitude and structure distribution of the space-time coherence can be designed and regulated as required.

The invention provides a lens group, an optical system and electronic equipment. The lens group comprises a first lens group, a second lens group and a third lens group, and the first lens group comprises a first lens to a fourth lens; the second lens group comprises fifth to eighth lenses; the third lens group includes ninth to thirteenth lenses. 0.86 < = f5 / T45 < = 4.55; 2.65 < = F910 / (CT9 + CT10) < = 3.52; f11 / F1213 is larger than-2.75 and smaller than-1.50, f5 is the effective focal length of the fifth lens, T45 is the air interval between the fourth lens and the fifth lens on the optical axis, F910 is the combined focal length of the ninth lens and the tenth lens, CT9 is the center thickness of the ninth lens, CT10 is the center thickness of the tenth lens, f11 is the effective focal length of the eleventh lens, and F1213 is the combined focal length of the twelfth lens and the thirteenth lens. The lens group can obtain a high-quality telephoto imaging effect.

The utility model relates to a binocular handheld telescope which comprises a first lens cone and a second lens cone, the first lens cone and the second lens cone are arranged side by side, a first optical imaging system is arranged in the first lens cone, and a second optical imaging system is arranged in the second lens cone. The focusing parameters of the first optical imaging system and the second optical imaging system are different; the handheld assembly is connected between the first lens cone and the second lens cone; wherein the handheld assembly comprises a focusing assembly, and the focusing assembly independently adjusts the focal length of the first optical imaging system and the focal length of the second optical imaging system. The embodiment of the utility model provides a binocular handheld telescope. Focal length adjustment of an optical imaging system with a plurality of different focusing parameters can be independently realized through a focusing assembly.

The invention provides a camera-based AI visual recognition and prediction control method and related equipment, and the method comprises the steps: obtaining continuous image frames of a moving object, and recognizing the skeleton key point coordinates and appearance feature information of the moving object; inputting the skeleton key point coordinates and the appearance feature information into a preset time sequence neural network model to obtain a motion prediction track; performing space mapping on the centroid coordinates of the moving object according to the motion prediction trajectory, and determining focal length control parameters of the camera; meanwhile, angle mapping is carried out on the position offset of the moving object, and pan-tilt control parameters are determined; and tracking and shooting the moving object according to the focal length control parameter and the holder control parameter. Through the mode, the camera can complete the pre-adjustment of the focusing mechanism and the composition direction before the target motion trend occurs, thereby effectively reducing the delay error in the focal length switching process, and improving the clear imaging rate and composition stability of a high-speed motion main body.

The invention discloses a stray light removing system of a diffractive optical element for beam splitting, which comprises a laser light source, the diffractive optical element for beam splitting, a first focusing element, a diaphragm, a second focusing element and a third focusing element which are sequentially arranged along the direction of a laser light path, and is characterized in that the diffractive optical element is used for splitting incident light into a plurality of sub-beams; a plurality of light through holes used for removing stray light are formed in the diaphragm corresponding to the plurality of sub light beams, the focal lengths of the first focusing element and the second focusing element are the same and are F, the distance between the diaphragm and the first focusing element and the distance between the diaphragm and the second focusing element are the same and are L, and L is equal to F. By forming a 4f filtering system, stray light of each sub light beam is effectively removed, and under the condition that the transmission characteristic of light is not changed, the whole structure is simple, operation is convenient, the yield of machined products is guaranteed, and cost is saved.

The invention relates to the related technical field of semiconductors, in particular to a chip processing production line monitoring method and system, and the method comprises the steps: collecting photoetching process monitoring data; setting a feature matrix; determining a focusing window boundary; configuring a focal length offset compensation amount based on the feature matrix in combination with a focusing window boundary and photolithographic process monitoring data; and determining a deviation amplitude score by using an edge placement error model to perform graded reminding. The technical problems that window boundary definition monitored by a chip processing production line depends on experience to set a fixed standard, focal length offset cannot be effectively compensated, and the risk that edge placement errors exceed the standard exists are solved, and coupling analysis of an optical proximity effect and a process window is carried out in a mask layer, a lens layer and a photoresist layer and a feature matrix is constructed, so that the edge placement error is accurately determined. And the compensation parameters and the error trend are dynamically matched, the focal length offset compensation precision is improved, an edge placement error model is used for determining a deviation amplitude score and carrying out graded reminding, and the technical effect of abnormity processing timeliness is enhanced.

The invention provides an optical system and electronic equipment. The optical system comprises a lens group, the lens group comprises a first lens group, a second lens group and a third lens group, and the first lens group comprises a first lens, a second lens, a third lens, a fourth lens and a fifth lens; the second lens group comprises a sixth lens, a seventh lens, an eighth lens, a ninth lens and a tenth lens; the third lens group comprises an eleventh lens, a twelfth lens, a thirteenth lens and a fourteenth lens; fG1 / f is more than-1.40 and less than-0.60; -4.50 < = F1112 / F1314 < =-1.40; fG2 / FG3 is more than 1.00 and less than 3.05; fG1 is the combined focal length of the first lens group, f is the effective focal length of the optical system, F1112 is the combined focal length of the eleventh lens and the twelfth lens, F1314 is the combined focal length of the thirteenth lens and the fourteenth lens, FG2 is the combined focal length of the second lens group, and FG3 is the combined focal length of the third lens group. The optical system effectively corrects spherical aberration, reduces the sensitivity of the optical system, and facilitates the realization of compactness and miniaturization.

The utility model discloses a laser processing system for rapidly preparing a large-area zero-taper microstructure, and belongs to the technical field of laser processing optical design. The laser processing system comprises a laser device, a beam expanding and collimating system, a shaping system, a translation transformation system and a focusing system which are sequentially arranged on a main shaft of a system light path, the translation transformation system comprises a first lens and a second lens, the focal length of the first lens is f1, the focal length of the second lens is f2, the distance between the first lens and the second lens is f1 + f2, and the focal length of the first lens is f1; the shaping system is located between the rear focal plane of the first lens and the first lens; the focusing system comprises a galvanometer and a field lens arranged at the emergent end of the galvanometer, and the field lens is located between the front focal plane of the second lens and the second lens. Microstructure machining is carried out through the laser machining system, the problem that the machining amplitude of a traditional rotary cutting laser machining system is too small is effectively solved, the machining efficiency is greatly improved, the taper problem existing in laser machining is solved, and the machining quality is better guaranteed.