68results about How to "High focusing precision" patented technology

The invention discloses an automatic focusing device for a projective bulb based on light spot detection and a use method thereof. The automatic focusing device comprises a lamp cup, a lamp cup clamping table, a screw I, a lampwick, a lampwick clamping frame, a large guide rail, a large slider, a screw II, an optical planar lens, a clamping holder, a convex lens, a supporting column, an optical filter, a two-dimensional photoelectric position sensor (PSD), a signal processing system, a PLC (programmable logic controller), a servo motor and a three-dimensional precise adjusting table, wherein light emitted from the lampwick can be reflected by the inner surface of the lamp cup to form parallel light beams, the parallel light beams can be transmitted and reflected twice by the optical planar lens, small parts of the light can be reflected to the convex lens, and then the light irradiates on the PSD by the optical filter after being gathered; a signal output by the PSD can be subjected to a series of conversion by the signal processing system, the PLC, the servo motor and the three-dimensional precise adjusting table; and finally the signal is used to control the position of the lampwick in the lamp cup. The device provided by the invention has the advantages of simple use method, low cost, high efficiency, high focusing precision and the like.

The invention discloses a high-precision focusing mechanism for a space optical remote sensor, and belongs to the technical field of space remote sensing, and solves the problems that the existing focusing mechanism is complicated in structure and nonlinear in focusing amount, and increases the focusing control and assembly difficulty as a connecting rod mechanism is used as a connecting part. A driving part comprises a motor, a first coupler and a worm; an executing mechanism comprises an encoder, a second coupler, a bearing pedestal, a bearing, a worm gear, Hall elements, magnetic steel, a lead screw, a special-shaped nut, a screw, a linear bearing pedestal, a linear bearing, a sliding shaft, an adapting seat, a focusing lens assembly, a linear guide rail pair and a focusing base. The high-precision focusing mechanism adopts the worm and gear pair and the lead screw and nut pair to realize transmission, and the nut is used for directly driving the focusing lens assembly to move horizontally; the high-precision focusing mechanism is high in focusing precision and capable of linearly controlling the focusing amount.

The invention discloses a precision focusing mechanism taking a linear motor and grating rulers as servo elements, and relates to the field of precision focusing. The precision focusing mechanism comprises a fixed lens barrel (1), a mobile lens barrel (2), the linear motor (3), a motor fixing seat (4), a clearance eliminating nut (5), a connection ball head (6), a radial bearing (7), a bearing gland (8), a motor connection block (9), a master grating ruler (10), a slave grating ruler (11), a connection sheet (12), a grating connection block (13), a photoelectric switch limiting mechanism (14), a limiting sheet (15) and a grating seat (16). The precision focusing mechanism has the beneficial effects that: a backlash error caused by motor screw rod transmission can be eliminated effectively, an error caused by a transmission loop of the conventional displacement sensor is reduced, and the focusing precision is improved; and furthermore, a motor screw rod is not influenced by a bending torque, so that the motor is protected.

The invention, which belongs to the optical focusing field, discloses a cam focusing mechanism employing a backlash elimination gear. The focusing mechanism comprises: a straight line groove sleeve, a gear-cam groove sleeve, a backlash elimination gear, a focusing pin, a fastening nail, a spring and a flange assembly. An optical assembly is sleeved in the straight line groove sleeve. The gear-cam groove sleeve is sleeved out of the straight line groove sleeve and steel balls are arranged between the gear-cam groove sleeve and the straight line groove sleeve. The gear-cam groove sleeve, the backlash elimination gear, the fastening nail and the spring form a gear backlash elimination mechanism. A camera is connected with the straight line groove sleeve through the flange assembly. Optical focusing is achieved through motor drive, gear backlash elimination mechanism transmission and optical assembly movements driven by the focusing pin. In the invention, the gear backlash elimination mechanism is adopted to eliminate a hysteresis error of gear drive and raise focusing precision. And the cam focusing mechanism is connected with the camera through the flange assembly so that a verticality of an optical axis of an optical path and a camera image surface can be conveniently adjusted.

The invention discloses a video camera automatic focusing system and a video camera automatic focusing method, which relate to the technical field of video cameras. The method provided by the invention comprises the following steps: a microprocessor receives a current scene picture photographed by a video camera, a focusing position of several target objects and a background in the picture is obtained through a picture focus estimation module, the microprocessor processes the information to obtain relative focusing position values, the values are transmitted to a focusing control module, the focusing control module controls a focusing motor, the video camera photographs one picture while moving every position, after all the input focus positions used in photographing, all the pictures aretransmitted to an image fusion processing module, and finally, a high-resolution image is obtained, and the image is previewed on a display screen of the video camera or stored in a memory chip. The method provided by the invention can solve the defects, such as inaccuracy of the existing manual focusing, slow speed and low efficiency of the other automatic focusing, and failure in immediately obtaining an ideal high-resolution image of the existing video camera.

The invention discloses an adaptive quick focusing device for an optical camera. The adaptive quick focusing device comprises a focus detector (1), an image collector (2), a data arithmetic unit (3), a focusing drive component (9) and an encoder (7), wherein the encoder (7) is used for acquiring the position of an image surface (10) of the optical camera; the image collector (2) is used for acquiring a quantized image; the data arithmetic unit (3) is used for calculating a configuration entropy of the image; and the focus detector (1) is used for calculates configuration entropies of images at two different positions and sending focusing information to the focusing drive component (9) according to a result to drive the image surface (10) of the optical camera to reach the position of the maximum configuration entropy. An adaptive quick focusing method for the optical camera comprises the following steps of comparing the configuration entropies of images formed by the image surface (10) of the optical camera at two different positions, adjusting the moving direction according to the comparison result, and taking the position of the maximum configuration entropy of the image as the focusing position of the image surface (10) of the optical camera. The focusing speed is high, the focusing accuracy is high, and the requirement of weak contrast objects on space remote sensing is met.

The invention provides a laser cutting device and a focusing method and system thereof. The focusing method comprises the steps that after the laser cutting device is powered on, a focusing mirror iscontrolled to return to the absolute zero point position when a focusing zero returning signal is received; when a first focus adjusting signal is received, a first analog voltage input signal containing a first target focus position is read and subjected to preset signal treatment, and the output frequency and the pulse quantity of a first pulse control signal for driving a servo motor are determined according to the first target focus position; the first pulse control signal is output according to the determined output frequency and the determined pulse quantity, the servo motor is driven through the first pulse control signal so that the servo motor can drive the focusing mirror to move within the preset motion range, and accordingly, the focus position is adjusted to the first target focus position when a laser cutting head of the laser cutting device conducts focusing on a laser beam. According to the laser cutting device and the focusing method and system thereof, the focusing precision and the focusing speed are improved, in addition, operation is easy and convenient, and the universality is high.

The invention discloses a focusing mechanism of a monitoring lens. The focusing mechanism comprises a supporting seat, wherein a circular through hole is formed at the middle of the supporting seat, a rotating sleeve is sleeved in the circular through hole, a lens connecting sleeve is sleeved at the middle of the rotating sleeve, at least one helical guide hole is formed on the outer circumferential surface of the rotating sleeve, at least one strip-shaped guide groove is distributed on the inner wall of the circular through hole along the axial direction, a driving gear is installed at the outer side of the supporting seat, a driven gear is arranged at the end part of the rotating sleeve to be matched with the driving gear, a guide pin is fixed on the lens connecting sleeve along the radial direction, one end of the guide pin penetrates through the helical guide hole to be matched with the guide groove; preferably, three helical guide holes are uniformly distributed along the outer circumferential surface of the rotating sleeve, and three strip-shaped guide grooves are uniformly distributed on the inner wall of the circular through hole along the axial direction; the driving gear is connected with a step motor through a retarding mechanism fixed with the supporting seat. The focusing mechanism disclosed by the invention is convenient to focus, capable of realizing automatic focusing of the monitoring lens and high in focusing precision.

The invention relates to a CCD focusing mechanism for a visible optical imaging system, and belongs to the field of adjustment for compensating camera focal plane defocusing. The CCD focusing mechanism is provided in order to solve a technical problem of camera focal plane defocusing of a visible television measuring system, and is characterized in that a stepper motor drives a lead screw shaft, a CCD mounting base is driven through transmission of a lead screw nut, the CCD mounting base slides on a guide rail through a guide rail sliding block, a linear potentiometer detects the position of the CCD mounting base in real time, and the CCD focusing mechanism for the visible light imaging system realizes translation focusing. The CCD focusing mechanism can operate steadily and smoothly within a range of -40 DEG C and +60 DEG C, does not get stuck, has the prominent advantages of high focusing accuracy, high carrying capacity, large stroke range and good environment adaptability, and can be applied to adjustment and compensation for camera focal plane defocusing caused by the factors such as the temperature, acting target distance variations, air pressure and vibration.

An adaptive focusing optical system comprises an optical body mechanism, an electric control box and an adaptive focusing mechanism. The optical body mechanism comprises a lens cone and an optical lens component and is used for acquiring optical image information of a target. The electric control box comprises a detector, an image processor and a controller which are connected in sequence, and is used for realizing focusing control, wherein the detector is installed at the joint of the electric control box and the optical body mechanism, the image processor is used for generating defocus criterion information according to digital image information and sending a corresponding control command to the controller, and the controller is connected with the adaptive focusing mechanism. A linear guide slot is arranged between a lens cone supporting module of the adaptive focusing mechanism and the lens cone of the optical body mechanism, a piezoelectric ceramic driving module is connected to the lens cone through a rigid push rod, and the adaptive focusing mechanism adjusts the position of the lens cone according to a received control signal to realize adaptive focusing.

The invention discloses an electro-optical system with adjustable focus. The electro-optical system at least comprises a body, a lens assembly arranged on the body, a light sensing assembly arranged with optical axis the same as that of the lens assembly, and a manual focusing structure, wherein the light sensing assembly and the manual focusing structure are arranged in a linked manner to adjust the focus between the light sensing assembly and the lens assembly. The invention also discloses an electronic otoscope applying the electro-optical system with adjustable focus. According to the invention, as the manual focusing structure is arranged, the focus can be adjusted manually in time according to the actual visual effect of the user in focusing operation, particularly, fine focus delayed in response of the existing electronic focusing structure can be adjusted, thereby having the beneficial effects of being high in focusing precision, convenient in focusing operation and the like.

The invention discloses an active and passive combined zoom automatic focusing method and system, and belongs to the technical field of photoelectric imaging. The active and passive combined zoom automatic focusing method comprises the following steps that step one: the distance from the target to the imaging system is measured through an active distance measuring system, and the position of the zoom group and the compensation group of the optical imaging system is changed according to the distance value so as to realize active rough focusing of the optical imaging system; and step two: the passive imaging system is used for realizing image acquisition and processing and performing passive fine focusing according to the image definition evaluation function value until focusing is completed. The invention also discloses an active and passive combined zoom automatic focusing system for realizing the method. The system comprises the active distance measuring system, the passive imaging system and a control system. Zoom automatic focusing used for the optical system can be realized, the high-definition image can be rapidly acquired through active and passive combined zoom automatic focusing and the real-time, accuracy and high precision requirements can be met.

The invention discloses an automatic clamping and focusing mechanism for a vehicle-mounted camera. The mechanism comprises a focusing rack plate, a clamping mechanism for clamping a lens, a rotation mechanism for adjusting the focal length of a camera, and a lifting mechanism for adjusting the clamping mechanism so as to make the clamping mechanism loosened or closed; the clamping mechanism is disposed on the rotation mechanism; the rotation mechanism is disposed on the focusing rack plate; the lifting mechanism is disposed on the focusing rack plate; the rotation mechanism comprises a stepping motor, a small belt wheel, a synchronous belt, a large belt wheel, a swing bearing and a rotating substrate; the clamping mechanism comprises a sliding assembly, two springs and two clamping openingassemblies arranged symmetrically; and the lifting mechanism comprises an annular slide groove, a plurality of air cylinder assemblies and two lifting assemblies arranged symmetrically. The automaticclamping and focusing mechanism for the vehicle-mounted camera of the invention has the advantages of precise focusing, convenient operation, capability of prolonging the service life of a wire rod,and the like.

The invention discloses a focusing method of a focusing device which is applied to a carbon dioxide (CO2) laser marking machine. The focusing device comprises a device system and a device system control system. A specific adjusting distance value is inputted through a keystroke, a pulse width modulation (PWM) pulse is outputted by a main control panel according to a set value to control a stepper motor driving device, and the stepper motor driving device drives a stepper motor to drive an optical lens holding device to move so as to change a focus; or the specific adjusting distance value is inputted through host computer software, the main control panel is communicated with the host computer software through a serial port, the main control panel outputs the PWM pulse according to the set value to control the stepper motor driving device, and the stepper motor driving device drives the stepper motor so as to drive the optical lens holding device to move and change the focus. The focusing device system has the characteristics of fast response speed, high precision, convenience in operation, high efficiency and the like.

The invention provides a processing visual device for a light-emitting diode (LED) laser cutting-up machine and relates to the technical field of laser cutting-up machines. The processing visual device mainly comprises a front alignment optical path and a bottom alignment optical path; the front alignment optical path is coaxial with a laser processing optical path and used for identifying and positioning the back of a transparent wafer and monitoring processing in real time; the bottom alignment optical path is coaxial with the laser processing optical path and used for identifying and positioning the front of a special coarsened wafer; and a bottom alignment lens is arranged at the bottom of a wafer chuck (24) and is coaxial with the front alignment lens; and the wafer is arranged on the wafer chuck (24) with an upward back. The front alignment of the wafer can be realized, the cutting-up process requirements of the coarsened wafer can be met in a mode of back cutting-up of the wafer, and the identification and alignment, and scratch monitoring of different wafers can be performed so as to contribute to improving production quality and automation degree. The wafer can be accurately focused by a laser focusing optical path and the cost is relatively low.

The invention discloses a laser coupling focusing mechanism and relates to the field of optical instruments. The device is technically characterized by comprising a fine adjustment sleeve, a main lenscone, a coupling lens group lens cone, a guide rod, a compression spring, multiple locking screws, an optical fiber connector seat, an optical fiber connector, a fixing screw, a pair of lenses A, a space ring A, a lens B, a space ring B and a pressing ring, wherein the main lens cone is arranged in the fine adjustment sleeve, the coupling lens group lens cone is arranged on the main lens cone, aleft end surface of the interior of the fine tuning lens cone is attached to a left end surface of the coupling lens group lens cone, a surface of the main lens cone is provided with a guide chute, the guide rod is sleeved in the guide chute on the main lens cone, the guide rod is fixed on an outer cylindrical surface of the coupling lens group lens cone through threads, a right end of the lens coupling lens group lens cone is provided with a spring mounting groove of the compression spring, a right end of a larger inner hole of the main lens cone is provided with a spring mounting groove, andthe compression spring is arranged between the two spring mounting grooves. The device is advantaged in that the structure is simple, machining cost is low, and adjustment is convenient.

The invention discloses a high-definition camera precise focusing platform and a focusing method, and aims at providing the high-definition camera precise focusing platform and the focusing method, which have excellent solidifying effect of dispensed glue and improve focusing efficiency and focusing precision. The high-definition camera precise focusing platform comprises a mounting plate, and anoptical device adjusting module, a five-axis motion module, a jacking and aligning module and a UV curing module are arranged on the mounting plate; a cooperative product carrier is arranged on the jacking and aligning module; the optical device adjusting module, the five-axis motion module and the UV solidifying module all cooperate with the product carrier; and the optical device adjusting module is located right above the product carrier. The platform and the method provided by the invention are applied to the technical field of camera assembling.

The invention discloses a microscope focusing device based on ultrasonic motor drive. An ultrasonic motor, bevel gears and bevel racks cooperate with one another to electrically control a support plate to move up and down, and the structure is very simple. During usage, the support plate can be controlled to move on any scale under the drive of the ultrasonic motor, so that the clearest focal length can be found out easily. The ultrasonic motor has no inertia during reciprocating, meanwhile, one adjusting mechanism is arranged between one bevel gear and the ultrasonic motor, one adjusting mechanism is arranged between the other bevel gear and an encoder, the bevel gears and the bevel racks can be always meshed closely by the aid of the adjusting mechanisms, and mechanical errors of a traditional structure are avoided when the support plate is controlled to move up and down. The ultrasonic motor, the bevel gears and the bevel racks cooperate with one another, the kinematic accuracy of the support plate is up to plus / minus 2 mu m through experiments, and the focusing accuracy of the focusing device is much higher than that of a traditional focusing structure.

The invention discloses multi-station rotary Demura equipment. The multi-station rotary Demura equipment comprises part replacing windows, Mura compensation devices and a rotary disc. 2n sets of bearing devices for containing display panels are symmetrically arranged on the rotary disc rotationally, one set of bearing devices in any two adjacent sets of bearing devices are located on the part replacing windows, the other set of bearing devices are located below the Mura compensation devices, when the rotary disc rotates by 360 / 2n degrees, the bearing devices located on the part replacing windows rotate below the Mura compensation devices, and the bearing devices located below the Mura compensation devices rotate to the part replacing windows. The multi-station rotary Demura equipment is simple in structure, convenient to use and high in automation degree, the Mura compensation devices and the rotary disc are integrated in a platform, in cooperation with the bearing devices, part replacing of the display panels is completed while Mura compensation of the display panels is achieved, and therefore the working efficiency of the equipment is improved.

The invention discloses a novel focusing non-blur lens module. A fixed mounting seat comprises a mounting seat base and a mounting seat sleeving part; the periphery of the mounting seat sleeving partis sleeved with an outer waveform elastic piece and an outer adjusting ring; the upper end part of the mounting seat sleeving part is provided with a cover plate; a mounting seat accommodating cavityof the fixed mounting seat is embedded with a lens frame; the core part of the lens frame is provided with a lens frame accommodating cavity; the lower end part of the inner wall of the lens frame accommodating cavity is provided with a lens frame flange; a spring located at the upper end side of the lens frame is also embedded in the mounting seat accommodating cavity; the lens frame accommodating cavity is internally embedded with an inner waveform elastic piece and a lens sleeve, and the lens sleeve is spinned in the lens frame; a focusing driving assembly is arranged beside the outer adjusting ring on the mounting seat base; the outer circumference of the lens frame is provided with a guiding piece; and the guiding piece passes through the sleeving part guiding hole in the mounting seat sleeving part and is inserted in an adjusting ring slope hole in the outer adjusting ring. Through the above structure, the novel focusing non-blur lens module has the advantages of novel structuredesign, good stability and reliability and high focusing precision, and a blur phenomenon can be effectively avoided.

The invention relates to an automatic focusing method for a digital optical imaging system, which comprises the following steps of: independently sampling and forecasting focusing evaluation function curves on left and right sides in the positions of focusing evaluation function curve peaks; calculating the position of an intersection point of the forecast left and right focusing evaluation function curves or a minimum value of an absolute value of a difference of the focusing evaluation function values in the same positions in the forecast left and right disperse focusing evaluation function value sequences; and controlling an executing mechanism to move a focal plane of the digital optical imaging system to the intersection point or minimum value position (focusing position). According to the automatic focusing method provided by the invention, independent sampling and forecasting are performed on left and right adjacent regions containing the peak position areas; a principle error caused by taking actually asymmetrical focusing evaluation function curves as symmetrical curves according to the automatic focusing method based on curve fitting and a swinging search process possibly occurring nearby the peaks according to a quick climbing method are avoided; the influence of sampling step length on the focusing precision according to the automatic focusing method based on bilateral forecasting intersection is small and the focusing precision and speed are higher.

The invention provides a multi-focus frequency domain OCT adaptive focusing device and a method thereof, and relates to the technical field of optical imaging. The device comprises an electric lifter.An object lens, a first half-transparent and half-reflection mirror, an eye lens and a second half-transparent and half-reflection mirror are successively arranged on a carrier plate. A light collecting mirror is arranged under a diaphragm. A white-light light source is arranged next to the light collecting mirror and is electrically connected with a computer through a wire. A first fiber collimating mirror, a second fiber collimating mirror, a third fiber collimating mirror and a fourth fiber collimating mirror are arranged next to the first half-transparent and half-reflection mirror. The first fiber collimating mirror, the second fiber collimating mirror, the third fiber collimating mirror and the fourth fiber collimating mirror are connected with an optical switch through wires. The beneficial effects are that it is ensured that the a micro-imaging system acquires high definition images; and meanwhile, it is achieved that clear view field area is increased and quite high focusingprecision is obtained in a field depth range.

The invention provides a low-cost ultra-short-focus projection lens, which comprises a refractor group and a reflector group, wherein the refractor group comprises a first lens group and a second lens group which only comprise spherical lenses, and a third lens group which at least comprises an aspherical lens. The low-cost ultra-short-focus projection lens has the advantages of few aspherical lenses and low cost.

A threaded focusing device disclosed by the present invention comprises a substrate, a CMOS module and a lens cone, wherein the substrate is equipped with a guiding counter bore, the CMOS module is fixed on the substrate, the lens cone comprises a guiding column and a plurality of first threaded holes, and the guiding counter bore on the substrate sleeves the guiding column on the substrate. The threaded focusing device also comprises a plurality of focusing bolts for connecting the lens cone and the substrate, and the position of the substrate can be adjusted along the direction of the guiding column by adjusting the focusing bolts. A threaded focusing mechanism of the present invention enables the focal length adjusting precision to be improved, enables the image quality to be improved,and enables the image quality not to be influenced by the outside world continuously and for a long time.

The invention discloses a focusing device in a long-focus and heavy-caliber optical system, relating to the technical field of optical machinery and aiming to solve the problems that the traditional focusing mechanism is difficult to determine the coaxial precision with optical axes of other fixed mirror groups during installation and has high difficulty in installation and adjustment. The device comprises an electric control displacement platform, a focusing mirror group, a sliding rail seat, a shifting fork and two cylinders, wherein the focusing mirror group is arranged in the sliding rail seat; the shifting fork is arranged on the outer side of the sliding rail seat and is fixedly connected with the electric control displacement platform; the focusing mirror group is in threaded connection with the two cylinders; U-shaped grooves are respectively arranged at two ends of the shifting fork; the sliding rail seat is provided with two slotted holes; and the cylinders sequentially pass through the slotted holes of the sliding rail seat and the U-shaped grooves of the shifting fork. The invention is widely applied to the optical system.

The invention discloses a Demura multi-axis full-automatic detection mechanism. The Demura multi-axis full-automatic detection mechanism comprises a stander and a CCD camera, wherein the stander is provided with a sliding table module, the movable end of the sliding table module is connected with a connecting frame, and the CD camera is connected to the bottom of the connecting frame; a rotary carrying table mechanism, a swinging sliding table and a gear focusing mechanism are successively arranged between the connecting frame and the CCD camera from top to bottom; the gear focusing mechanismcomprises a foundation support, a second drive source, a driving gear and a driven gear; and the rotary carrier table mechanism, the swinging sliding table and the CCD camera are coaxially distributed. Compared with the traditional Demura detection mechanism, the Demura multi-axis full-automatic detection mechanism is simple in structure and convenient in use; the CCD camera can move along the directions of an X axis, a Y axis and a Z axis and can also rotate around the X, Y and Z axis, so that the full-automatic adjustment can be realized; and moreover, the Demura multi-axis full-automatic detection mechanism is provided with a focal length adjusting mechanism, and the inaccuracy in focusing and damage of the camera caused by the large adjustment amplitude of the CCD camera along the Z axis direction can be avoided.

The invention discloses a focusing mechanism of a monitoring lens. The focusing mechanism comprises a supporting seat, wherein a circular through hole is formed at the middle of the supporting seat, a rotating sleeve is sleeved in the circular through hole, a lens connecting sleeve is sleeved at the middle of the rotating sleeve, at least one helical guide hole is formed on the outer circumferential surface of the rotating sleeve, at least one strip-shaped guide groove is distributed on the inner wall of the circular through hole along the axial direction, a driving gear is installed at the outer side of the supporting seat, a driven gear is arranged at the end part of the rotating sleeve to be matched with the driving gear, a guide pin is fixed on the lens connecting sleeve along the radial direction, one end of the guide pin penetrates through the helical guide hole to be matched with the guide groove; preferably, three helical guide holes are uniformly distributed along the outer circumferential surface of the rotating sleeve, and three strip-shaped guide grooves are uniformly distributed on the inner wall of the circular through hole along the axial direction; the driving gear is connected with a step motor through a retarding mechanism fixed with the supporting seat. The focusing mechanism disclosed by the invention is convenient to focus, capable of realizing automatic focusing of the monitoring lens and high in focusing precision.

The invention discloses a maskless lithography device comprising a focus diffractive optical element and a first Moire grating group, wherein the focus diffractive optical element is used for transferring a preset lithography graph to a substrate; and the first Moire grating group is positioned on a plane on which the focus diffractive optical element is positioned, comprises at least two Moire gratings, and is used for adjusting the distance between the focus diffractive optical element and the substrate by utilizing the movement of Moire patterns generated by the at least two Moire gratings. The maskless lithography device provided by the invention is used for integrating the Moire grating group for focusing and the focus diffractive optical element together, and has the advantages of high focusing accuracy, simple structure and low cost.

The invention relates to the technical field of optical systems, and particularly discloses a lens focusing mechanism. The lens focusing mechanism comprises a focusing bracelet, a fixed cylinder, at least one cylindrical pin and a cylindrical cam sleeve. Multiple threads are arranged on the outer cylindrical surface of the cylindrical cam sleeve, and multiple threads matched with the cylindrical cam sleeve are arranged on the inner side of the fixed cylinder. The cylindrical cam sleeve is radially provided with at least one cam groove, the cylindrical pins are radially uniformly distributed onthe outer circle of a lens barrel, and the cylindrical pins correspond to the cam grooves one by one. The fixed cylinder is fixedly connected with a lens, the cylindrical cam sleeve is sleeved with the fixed cylinder, the cylindrical cam sleeve is connected with the lens barrel through the cam grooves and the cylindrical pins, and the focusing bracelet is fixedly connected with the cylindrical cam sleeve. The focusing mechanism has the beneficial effects of effectively reducing friction, accurately focusing and being stable and reliable.