CN115542502B - Processing method for realizing high-precision imaging lens - Google Patents
Processing method for realizing high-precision imaging lens Download PDFInfo
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- CN115542502B CN115542502B CN202211275010.7A CN202211275010A CN115542502B CN 115542502 B CN115542502 B CN 115542502B CN 202211275010 A CN202211275010 A CN 202211275010A CN 115542502 B CN115542502 B CN 115542502B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/021—Mountings, adjusting means, or light-tight connections, for optical elements for lenses for more than one lens
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B5/00—Turning-machines or devices specially adapted for particular work; Accessories specially adapted therefor
- B23B5/16—Turning-machines or devices specially adapted for particular work; Accessories specially adapted therefor for bevelling, chamfering, or deburring the ends of bars or tubes
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/025—Mountings, adjusting means, or light-tight connections, for optical elements for lenses using glue
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- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
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- Lens Barrels (AREA)
Abstract
The invention discloses a processing method for realizing a high-precision imaging lens, which comprises the steps of sequentially rotating lens groups according to the sequence of installation into a lens barrel, searching the position of the maximum direction of the deflection of the optical axis of each lens group, recording the maximum deflection angle degree value, marking the corresponding position on the lens group, then rotating and adjusting the optical axis of a first lens group to meet the requirement (the optical axis of the lens barrel is consistent with the optical axis of the first lens group), starting a subsequent lens group by taking the first lens group as a reference, rotating the lens group to ensure that the position of the maximum deflection angle of the optical axis is opposite to the position of the maximum deflection angle of the first lens group, and mutually offset the deflection angles, wherein the subsequent lens groups are all adjusted in such a way that the directions of the deflection angles of the optical axes are mutually opposite and the deflection angle values are calculated, so that the positive and negative addition offset of the total deflection angles is minimum; compared with the prior art, the design has the advantages that the machining precision requirement on centering turning can be reduced, the yield is improved, and the machining difficulty is reduced.
Description
Technical Field
The invention relates to a processing method for realizing a high-precision imaging lens, and belongs to the technical field of optics.
Background
Industrial lenses are important imaging elements in machine vision systems, which must be able to meet the requirements if the system is to fully function. With the wide application of machine vision systems in the field of precision detection, common industrial lenses are difficult to meet the detection requirements, so as to make up for the defects of common lens application, adapt to the precision detection requirements and develop a high-precision imaging lens. The main problems for realizing high-precision imaging of the lens are processing of the lens, control of the fit tolerance when the lens is assembled with the lens barrel and assurance of the air gap between the lens.
The lens is manufactured in a common lens processing mode by adopting centering turning, the lens is machined by centering turning, the lens and the lens frame are firstly required to be assembled coaxially, then the assembled lens and the lens frame assembly are subjected to centering turning, and the lens frame or the lens seat required by assembling the lens barrel and the spacer is obtained by turning.
Under the condition of large temperature change, the structural parameters of the optical lens can be fluctuated, particularly, the change amplitude of different materials is different, the thermal expansion coefficient is different due to the processing error of the materials, the dimensional error is included, the deflection angle of an optical axis can be caused, even the phenomenon of interference extrusion or excessive loosening and shaking can be caused when the original tight fit is caused, the imaging quality is influenced, and if electronic active adjustment is adopted, the design cost is increased, and more unstable factors are increased; it is therefore desirable to design a design that is mechanically able to counteract each of the adverse parameters. The influence of temperature on the optical system is counteracted by the adjustment of the optical system. In order to solve the technical problems, a new technical scheme is specifically provided.
Disclosure of Invention
The invention aims to provide a processing method for realizing a high-precision imaging lens, so as to solve the problems in the background technology.
In order to achieve the above purpose, the present invention provides the following technical solutions: a processing method for realizing high-precision imaging lens, the lens comprises a lens barrel, a lens group, a centering mechanism arranged on the lens barrel and an imaging device;
the lens group comprises a lens seat and a lens fixed on the lens seat; the centering mechanism comprises a glue injection hole, a top eccentric process threaded hole and a spacer ring,
the lens barrel comprises a central line, more than 3 glue injection holes and more than 3 screw holes for fixing a top eccentric process are uniformly distributed on the outer side wall of the lens barrel by taking the central line of the lens barrel as the center, the lens barrel comprises a barrel cavity, more than 2 space rings are arranged in the barrel cavity, a lens group limiting cavity is formed between two adjacent space rings, the lens group is limited in the barrel cavity by the lens limiting cavity,
the top core-shifting process threaded hole and the glue injection hole are respectively communicated with the lens limiting cavity, a flat head jackscrew matched with the top core-shifting process threaded hole is arranged on the top core-shifting process threaded hole,
characterized in that the method comprises the steps of:
s1, fixing the processed lens into a corresponding lens seat to form a lens group.
S2, machining the lens group, adjusting the optical axis of the lens by using the internal focusing auto-collimator, and turning the outer circle of the lens group by using a turning tool on a main shaft of a centering lathe, so that the main shaft of the lathe, the optical axis of the lens and the three axes of the internal focusing auto-collimator are coaxial.
S3, turning the end face of the lens group to meet the design requirement, and observing an internal centering instrument while adjusting to ensure the coaxiality and interval requirements between lenses; glue injection holes are formed in the outer circumference of the lens cone and correspond to the lens group, and are used for fixing the adjusted lens group;
s4, sequentially assembling the processed lens groups into a lens barrel, and fixing all the lens groups into the lens barrel by using a lens barrel pressing ring after adjusting the lens groups into place;
s5, detecting the change of the optical axis deflection angles of the whole lens and each lens group, and then rotating the lens group according to the optical axis deflection angles of the lens group so that the optical axis deflection angles are mutually offset;
s6, adjusting jackscrews corresponding to the lens groups on the lens barrel to enable each lens group of the whole lens to be consistent with an optical axis of the lens barrel, and then injecting glue for curing; the offset angle errors of the whole installed lens in the change of the ambient temperature can be mutually offset.
In the step S5, the lens is subjected to thermal analysis, the deflection angle direction and the deflection angle size of the optical axis are measured, and the positions corresponding to the circumferences in the deflection angle direction are marked and then used as the bottom of the lens barrel; the lens is adjusted in sequence, and the specific adjustment steps are as follows:
1) Sequentially rotating the lens groups for 360 degrees according to the sequence of installation into the lens barrel, searching the position on the circumference corresponding to the maximum direction of the deflection of the optical axis of each lens group, and recording the maximum deflection angle value, wherein the position of the maximum deflection angle on the circumference of the first lens group is used as the bottom to coincide with the bottom of the lens barrel;
2) And then the optical axis of the second group of lens is adjusted by rotating the second group of lens with the first group of lens as a reference, the position of the maximum angle of the optical axis deflection direction of the second group of lens is opposite to the position of the maximum angle of deflection of the first group of lens, so that the angles of deflection are counteracted with each other, the next group of lens is adjusted in sequence, the position of the maximum angle of deflection of the optical axis in the rotation process of the group of lens is opposite to or the same as the previous group of lens, and the tolerance is kept within 10 degrees, so that the maximum angles of deflection of the groups of lenses are counteracted with each other.
The end face of the outer side face of the lens group in the sequence outer side is provided with a protrusion or a pit, in the installation process, a matched tool is utilized in the installation process, so that the whole lens group can rotate, the optical axis angle direction of the lens group can be adjusted, and the rotating lens group meets the requirements.
The lens barrel is provided with a step corresponding to the lens group, and a circle of lubricating glue is coated at the middle position of the outer periphery of the lens group before the lens group is assembled to the step, so that the lens barrel is convenient to rotate and adjust.
The lens cone comprises a central line, more than 3 glue injection holes and more than 3 screw holes for fixing a top eccentric process are correspondingly and uniformly distributed on the outer circumference taking the central line of the lens cone as the center at the positions corresponding to the lens group, and after the lens group is rotationally adjusted to a proper angle, the lens group is screwed tightly on the screw holes by adopting flat head jackscrews for fixing.
The lens barrel comprises a barrel cavity, more than 2 space rings are arranged in the barrel cavity, a lens limiting cavity is formed between two adjacent space rings, a lens is arranged in the barrel cavity in a limiting mode through the lens limiting cavity, a top core-deflection process threaded hole and a glue injection hole are respectively communicated with the lens limiting cavity, and a flat head jackscrew matched with the top core-deflection process threaded hole is arranged on the top core-deflection process threaded hole.
The imaging device is provided with a lens rear end, the imaging device comprises a photosensitive device, the photosensitive device is a photosensitive unit and is designed into a curved surface, and the curved surface is an aspheric surface.
In addition to the above scheme, the imaging device adopts a CCD imaging device, the imaging device eliminates imaging errors through system calculation, and the photosensitive layer is arranged to form a paraboloid radially outwards from a center point.
Compared with the prior art, the invention has the beneficial effects that: sequentially rotating the lens groups according to the sequence of installation of the lens barrel, searching the position of the maximum direction of the optical axis deflection of each lens group, recording the maximum deflection angle value, marking the corresponding position on the lens group, then rotating and adjusting the optical axis of the first lens group to meet the requirement (the optical axis of the lens barrel is consistent with the optical axis of the first lens group), starting the subsequent lens group by taking the first lens group as a reference, rotating the lens group to ensure that the position of the maximum deflection angle of the optical axis is opposite to the position of the maximum deflection angle of the first lens group, so that the deflection angle values are mutually offset, adjusting the subsequent lens groups in such a way that the directions of the deflection angles of the optical axes are mutually opposite, calculating the deflection angle values, enabling the positive and negative addition offset of the total deflection angle values to be minimum, and enabling optimal interpretation to be zero; the maximum angular positions of the optical axes in the rotation process of the lens group are opposite or close to opposite or the same, the tolerance is kept within 30 minutes, the lens group is sequentially rotated to respectively find the maximum angular position and the maximum angular position, and then the optical axis angular directions measured in the lens barrel thermal analysis are consistent (or parallel), so that the optimal design scheme is finally achieved. And then adjusting the jackscrew to enable the optical axis of the whole lens to be consistent, and then injecting glue for curing. The machining precision requirement of the design on centering turning can be reduced, and the yield is improved. The processing difficulty is reduced. The photosensitive layer of the CCD imaging device is arranged to form a paraboloid radially outwards at the center point by matching with the method, so that the spherical aberration of the large-caliber lens group is geometrically counteracted.
Drawings
For a clearer description of embodiments of the present application or of the solutions in the prior art, the drawings that are needed in the embodiments will be briefly described, it being obvious that the drawings in the following description are only some embodiments described in the present invention, and that other drawings may be obtained according to these drawings for a person skilled in the art;
FIG. 1 is a schematic view of a lens assembly;
FIG. 2 is a schematic view of a lens assembly of the present invention mounted to a lens barrel;
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1 and fig. 2 of the specification, the present invention provides a technical solution: a processing method for realizing high-precision imaging lens is provided to solve the problems in the prior art. The invention provides the following technical scheme: a processing method for realizing high-precision imaging lens, the lens comprises a lens barrel, a lens group, a centering mechanism arranged on the lens barrel and an imaging device;
the lens group comprises a lens seat and a lens fixed on the lens seat; the centering mechanism comprises a glue injection hole, a top eccentric process threaded hole and a spacer ring,
the lens cone comprises a central line, more than 3 glue injection holes and more than 3 screw holes for fixing the top eccentric process are uniformly distributed on the outer side wall of the lens cone by taking the central line of the lens cone as the center, after the lens group is rotationally adjusted to a proper angle, the lens group is screwed tightly on the screw holes by flat head jackscrews for fixing, and in design, the glue injection holes and the screw holes are all corresponding to the periphery of the lens group.
The lens barrel comprises a barrel cavity, more than 2 space rings are arranged in the barrel cavity, a lens group limiting cavity is formed between two adjacent space rings, and the lens group is arranged in the barrel cavity in a limiting manner through the lens limiting cavity;
the top core-shifting process threaded hole and the glue injection hole are respectively communicated with a lens limiting cavity, and a flat head jackscrew matched with the top core-shifting process threaded hole is arranged on the top core-shifting process threaded hole, and the method is characterized by comprising the following steps:
(S1) fixing the finished lens 1 to the corresponding lens holder 2 to form a lens group.
And (S2) processing the lens group, adjusting the lens optical axis 3 by using the internal focusing auto-collimator, and turning the outer circle of the lens group by using a turning tool on a main shaft of a centering lathe to enable the main shaft of the lathe, the lens optical axis and the internal focusing auto-collimator to be coaxial in three axes.
(S3) turning the end face of the lens group to meet the design requirement, and observing an internal centering instrument while adjusting to ensure the coaxiality and interval requirement between lenses; glue injection holes are formed in the outer circumference of the lens cone and correspond to the lens group, and are used for fixing the adjusted lens group;
(S4) sequentially assembling the processed lens groups into a lens barrel, and fixing all the lens groups into the lens barrel by using a lens barrel pressing ring after the lens groups are adjusted to be in place;
(S5) detecting the change of the optical axis deflection angle 6 of the whole lens and each lens group, and then rotating the lens group according to the optical axis deflection angle so as to offset the optical axis deflection angle; firstly, performing thermal analysis on a lens, measuring the deflection angle direction and the deflection angle of an optical axis, marking the position corresponding to the circumference in the maximum deflection angle direction, and then taking the position as the bottom of a lens barrel; the lens is adjusted in sequence, and the specific adjustment steps are as follows:
1) Sequentially rotating the lens groups for 360 degrees according to the sequence of installation into the lens barrel, searching the position on the circumference corresponding to the maximum direction of the deflection of the optical axis of each lens group, and recording the maximum deflection angle value, wherein the position of the maximum deflection angle 6 on the circumference of the first lens group is used as the bottom to coincide with the bottom of the lens barrel;
2) And then the optical axis of the second group of lens is adjusted by rotating the second group of lens with the first group of lens as a reference, the position of the maximum angle of the optical axis deflection direction of the second group of lens is opposite to the position of the maximum angle of deflection of the first group of lens, so that the angles of deflection are counteracted with each other, the next group of lens is adjusted in sequence, the position of the maximum angle of deflection of the optical axis in the rotation process of the group of lens is opposite to or the same as the previous group of lens, and the tolerance is kept within 10 degrees, so that the maximum angles of deflection of the groups of lenses are counteracted with each other.
The lens group is provided with protrusions or pits on the end face of the outer side face in sequence according to the installation sequence, in the installation process, the whole lens group is rotatable in the installation process by using matched tools, the optical axis angle direction of the lenses of the lens group is adjustable, and the rotating lens group meets the requirements. The change of the optical axis and the coincidence with the axis of the lens barrel are always monitored in the rotating and mounting process.
The lens barrel 5 is provided with a corresponding step corresponding to the lens group, the inner diameter of the lens barrel 5 is matched according to the size of the lens group, and a circle of lubricating glue is coated on the middle position of the outer periphery of the lens group before the lens group is assembled to the step, so that the lens barrel is convenient to rotate and adjust.
S6, adjusting jackscrews corresponding to the lens groups on the lens barrel to enable each lens group of the whole lens to be consistent with an optical axis of the lens barrel, and then injecting glue for curing; the offset angle errors of the whole installed lens in the change of the ambient temperature can be mutually offset.
The lens cone 5 comprises a central line, the positions corresponding to the lens groups on the outer side wall of the lens cone 5 are uniformly distributed with more than 3 glue injection holes and more than 3 screw holes for fixing a top eccentric process by taking the central line of the lens cone as the center, and after the lens groups are rotationally adjusted to a proper angle, flat head jackscrews are adopted to screw the lens groups on the screw holes for fixing.
The lens cone comprises a cylinder cavity, a corresponding space ring is arranged in the cylinder cavity and used for isolating adjacent lens groups, the lens groups are limited in the cylinder cavity through the space ring, the space ring is not needed in the design, the width is directly increased through the periphery of the lens seat, the lens groups are fixed through the mode of respectively adjusting screw tightening flat head jackscrew fixing and glue injection fixing through the screw hole and the glue injection hole of the top eccentric process, and a cavity between the lens groups is formed.
The end face processing process of the lens group lens seat has errors, the change of the optical axis is measured in the rotating process, the maximum deflection angle direction of the optical axis is found, the maximum deflection angle value is estimated, and the adjacent lens groups are sequentially and rotatably arranged, so that the maximum deflection angle direction is opposite to compensate deflection angle change; the deflection angle change of the lens group and the thermal analysis deflection angle direction of the lens barrel are in one direction or opposite directions, in the assembling process, the deflection angle direction of the lens barrel is taken as the bottom, then fixed through the jackscrew, the opposite direction is taken as the top, glue is injected downwards for solidification, then other glue injection holes are fixed at last, and other expansion coefficients of the lens base, the fixed glue and the jackscrew are calculated and analyzed, and proper materials are selected to compensate the deflection angle change angle of the lens barrel; this compensation design is offset by the principle of thermal expansion offset from each other.
In the mounting process, when the lens base is mounted, a protrusion or a pit is arranged on the end face of the outer side according to the mounting direction, and the whole lens group can rotate in the mounting process by using a matched tool, so that the optical axis angle direction of the lenses of the lens group can be adjusted; when the jackscrew is adjusted, the screwing depth of the jackscrew and the glue injection thickness of the glue injection hole are considered, meanwhile, the central axis deflection angle direction of the lens barrel is considered, and after the collision coefficients of all materials are compared, the placement direction (considering the circumferential direction) of the lens barrel is caused; under the effect of gravity, after the lens group is arranged and put into the lens cone, the clearance between the upper part and the lens cone can be larger, the expansion coefficient of jackscrew and fixed glue is also considered, at the moment, after the jackscrew is fixed and glue injection is solidified, the influence on the optical axis is in opposite directions when the temperature is changed, and the effects of mutual offset are achieved, so that the influence on the optical axis is offset or minimized.
Because the optical lens in the lens is arranged in the main lens barrel and the lens base, the main lens barrel and the lens base are subjected to temperature influence and can generate thermal deformation, so that the optical axis of the optical lens is changed, and the optical system is deviated. Before the lens group is solidified, the lens is thermally analyzed, the optical axis deflection angle change influenced by the deformation of the lens, the deformation of the lens base and the spacer is mainly considered, marks are made on the lens barrel corresponding to the maximum deflection angle position, and the value of the optical axis deflection angle is measured. And then calculating the deformation of the corresponding material according to the expansion coefficient in the processing process of the lens base. According to the layout of the optical-mechanical structure, when the lens is affected by the ambient temperature, the optical axis change is finally affected due to different material properties and different thermal expansion coefficients in the structure, and the lens is more stable due to reverse offset through the changing direction in consideration of the optical axis change during design.
And performing thermal analysis on the lenses before and after the improvement, estimating the optical axis deflection angle of the lenses, and judging the optical axis consistency of the lenses after the improvement by comparing the optical axis deflection angles. And the optical axis consistency test is carried out on the lenses before and after the improvement, and the comparison is carried out before the compensation design, and the result is almost consistent with the design theoretical value, so that the optical axis consistency of the lenses after the improvement is better. And after design, the lens is subjected to normal temperature and high and low temperature tests, and the result shows that the imaging quality is good, and the lens is proved to meet the use requirement.
The optical system in the optical machine structure in the scheme of the invention adopts a refraction type and a mechanical compensation type, wherein the lens is fixed in the lens seat, and can be a resin lens, so that the optical machine structure is a high-quality lens material widely used at present. The advantages are that: light weight, impact resistance and uneasy breaking. The absorption of ultraviolet light is far stronger than that of glass lenses. Disadvantages: the lens made of the material has poor wear resistance, is easy to scratch, and has relatively low refractive index.
The method for assembling and adjusting by reference centering turning adopted by the method needs to design the mechanical structure of the lens into a duplex structure, designs a lens seat for each lens independently, can fix the lens into the lens seat to form a lens group by gluing or pressing by using a pressing ring, then performs centering turning on the lens group according to the design standard, turns an outer circle to ensure the tight connection of each lens group and an external lens barrel, and the centering turning and adjusting method is to make a centering lathe spindle, a lens group optical axis and an inner focusing auto-collimator detection lens optical axis coaxial by the centering turning method. Although the assembly and adjustment mode has relatively high assembly precision, the problem of precision control in turning and assembly is also difficult to avoid, and the thickness control of the lens base is difficult to grasp, so that in the assembly, the lens base is optimally ensured to be thick and hard enough to support the lens, and thin enough to lighten the weight of the whole lens after assembly and ensure that the thermal expansion of temperature change is minimum; the method for adjusting the optical axis deflection angle in the invention adopts the quantitative control in the turning mode, and simultaneously adopts the method for adjusting and fixing the top eccentric, thereby avoiding or reducing the influence of temperature change on imaging quality, namely improving the assembly precision.
In another scheme, according to the requirements of various use environments, a crystal or glass lens can be adopted, the lens can be directly processed in a centering edging mode, the periphery of the lens is processed into a ring mouth shape, the outer periphery of the lens is processed into a plane or slightly concave, the flat head jackscrew is convenient to fix and glue injection and solidification through a glue injection hole, and the lens is suitable for being directly matched and fixed with a lens barrel, so that the processing and solidification of a lens seat are omitted, the tolerance and expansion coefficient of the lens are directly considered in the process of adjusting the rotating lens, and an air gap is formed between the lenses through separation of a spacer. If the lens group for eliminating chromatic aberration is considered, the optical axis deflection angles of the lens groups are found by rotation, and the optical axis deflection angles of different lens groups are arranged in opposite directions, so that the purpose of mutual offset is achieved.
The temperature difference typically used in the temperature test ranges from-40 degrees to 60 degrees. The materials commonly used as lenses in the optical lens are classified into common optical glass and crystal materials, the common glass has low price and low processing cost, the crystal materials have high raw material cost and complex processing cost, and the common glass is preferably used for manufacturing optical elements. Under the condition that the common glass material is preferentially adopted for making the lens, the lens barrel and the lens seat are made of titanium alloy materials with the thermal expansion coefficient similar to that of glass, so that the cost can be reduced, the overall weight of the lens can be reduced, and the influence of temperature change on the optical axis can be better counteracted.
In the design of the lens barrel or the lens base, the design can be optimized to solve the problems of weight reduction, engineering cost reduction, structural performance improvement and the like, and parameters required to be adjusted and optimized in the optimization design are called design variables such as size, shape and the like; the variable which changes along with the change of the design variable and plays a role in limiting the value of the design variable is called a constraint function, such as stress, displacement, cylindricity and the like; the function that changes due to the change in the design variable is called an objective function, such as mass, volume, etc. The lens barrel is a revolving body structure, the wall thickness of the lens barrel determines the whole mass and volume of the lens barrel, the wall thickness dimension variable of the revolving wall of the lens barrel is used as a design variable, parameters and thickness of a lens are designed through the existing optical design tool so as to optimize, reduce the use of materials, lighten the weight of the lens, and optimize and design the lens barrel and a lens seat through the properties of different materials by using constraint functions, wherein an objective function is the minimum mass of the lens barrel. For example, the HyperMorph design tool can be used for optimal design. The optical path simulation can be designed and simulated by Zmax software.
Besides the above mode of eliminating chromatic aberration and the mode of eliminating temperature influence, the improved design on the imaging device which receives imaging at the rear end of the lens can be considered, and the principle of retina of eyes is utilized, at the image receiving end, the imaging device comprises a photosensitive device which is designed into a curved surface, and the curved surface is designed into an aspheric paraboloid corresponding to the aberration. The radial parabolic design of the center starting point of the parabolic optical axis forms parabolic imaging; the imaging device is connected with the CCD camera unit, and further comprises a front driving module, an image processing and signal driving module and a display module, wherein the front driving module is in driving connection with the CCD camera unit, and is also connected with an optical axis eccentricity detection device and an imaging speckle detection device; and in particular, the imaging errors formed by the phase difference and the chromatic aberration are compensated at the imaging edge. The imaging device eliminates the phase difference and the chromatic aberration through system calculation, but the existing mode can not completely eliminate the imaging quality error formed by the edges of the lenses, and the CCD photosensitive layer is designed into a paraboloid according to the principle of human eyes, so that the imaging quality error can be further eliminated.
The manufacturing of the curved surface of the CCD can be completed by optimizing the photosensitive material layer according to the processing process of the CCD, firstly, the substrate is sliced according to the good curved surface shape designed by the optical design system, for example, a silicon substrate is sliced into a parabolic shape, other CCD imaging devices which are manufactured according to the existing CCD manufacturing process and finally form the required parabolic shape are manufactured in a large-scale, and the cost is reduced. However, this does not affect the fabrication of the special need parabolic CCD imaging device, and is technically unproblematic.
This eliminates errors, such as spherical aberration, caused by the fact that the lens has a large diameter and is located far from the center of the optical axis.
Compared with the prior art, the method has the advantages that on the basis of the centering turning and adjusting method, the problem that the optical axis is deviated according to the eccentricity of the lens formed by the lens and the lens group is solved, and a better effect can be achieved through low-cost adjustment; the implementation of the method has high requirements on the number of process personnel, so that the method is important for detecting and marking the parameter values of the lens and the lens group in the adjustment process, adjustment is performed on the basis of marking, and the lens group are cured after adjustment, so that the performance of the product is more stable. The beneficial effects of the invention are as follows: sequentially rotating the lens groups according to the sequence of installation of the lens barrel, searching the position of the maximum direction of the optical axis deflection of each lens group, recording the maximum deflection angle value, marking the corresponding position on the lens groups, then rotating and adjusting the optical axis of the first lens group to meet the requirement (the optical axis of the lens barrel is consistent with the optical axis of the first lens group), starting the subsequent lens group by taking the first lens group as a reference, rotating the lens group to ensure that the position of the maximum deflection angle of the optical axis is opposite to the position of the maximum deflection angle of the first lens group, so that the deflection angle values are mutually offset, adjusting the subsequent lens groups in such a way that the directions of the deflection angles of the optical axes are mutually opposite, calculating the deflection angle values, enabling the positive and negative addition offset of the total deflection angle values to be minimum, and enabling the optimal solution to be zero; the maximum angular position of the optical axis in the rotation process of the lens group is opposite or close to opposite or the same, the tolerance is kept within 30 degrees, the lens group is sequentially rotated to respectively find the maximum angular position and the maximum angular position, and then the optical axis angular direction measured in the lens barrel thermal analysis is consistent (or parallel), so that the optimal design scheme is finally achieved. And then adjusting the jackscrew to enable the optical axis of the whole lens to be consistent, and then injecting glue for curing. The machining precision requirement of the design on centering turning can be reduced, and the yield is improved. The processing difficulty is reduced.
The drawings of the present invention are only for the purpose of presenting a principle that is readily understood by one of ordinary skill in the art. Because of the limitation of the page size of the patent application, in order to clearly show the principle, in the drawings, where the proportion of the size of each part may not be consistent with the actual product, those skilled in the art will understand that, for example, in the drawings, to highlight the structural principle of a certain part, the part is purposely drawn to be large, while the other part is too small, etc., which can be understood in this way, based on the principle of the present invention, those skilled in the art can naturally utilize the industrialized more reasonable design to make each part smaller and more exquisite, and more practical, which are all the ways known to those skilled in the art.
In the description of the present invention, it should be understood that the terms "coaxial," "bottom," "one end," "top," "middle," "another end," "upper," "one side," "top," "inner," "front," "center," "two ends," etc. indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
Based on the fact that no product is only advantageous and has no defects, the invention is only used for specific environments in the background technology, such as scenes mentioned in the background technology, if some users consider price factors, inconvenient carrying and the like, the purchase of the application is not suggested, and the product is only used for and suggested by users who need to mention the scenes in the background technology and can accept and ignore other negative factors at the same time.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "configured," "connected," "secured," "screwed," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intermediaries, or in communication with each other or in interaction with each other, unless explicitly defined otherwise, the meaning of the terms described above in this application will be understood by those of ordinary skill in the art in view of the specific circumstances.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
While certain exemplary embodiments of the present invention have been described above by way of illustration only, it will be apparent to those of ordinary skill in the art that modifications may be made to the described embodiments in various different ways without departing from the spirit and scope of the invention. Accordingly, the drawings and description are to be regarded as illustrative in nature and not as restrictive of the scope of the invention, which is defined by the appended claims.
Claims (5)
1. A processing method for realizing high-precision imaging lens, the lens comprises a lens barrel, a lens group, a centering mechanism arranged on the lens barrel and an imaging device;
the lens group comprises a lens seat and a lens fixed on the lens seat; the centering mechanism comprises a glue injection hole, a top eccentric process threaded hole and a spacer ring,
the lens barrel comprises a central line, more than 3 glue injection holes and more than 3 screw holes for fixing a top core deflection process are uniformly distributed on the outer side wall of the lens barrel by taking the central line of the lens barrel as the center, and after the lens group is rotationally adjusted to a proper angle, the lens group is screwed on the screw holes by flat head jackscrews for fixing;
the lens barrel comprises a barrel cavity, more than 2 space rings are arranged in the barrel cavity, a lens group limiting cavity is formed between two adjacent space rings, the lens group is arranged in the barrel cavity in a limiting way through the lens group limiting cavity,
the top core-shifting process threaded hole and the glue injection hole are respectively communicated with a lens group limiting cavity, a flat head jackscrew matched with the top core-shifting process threaded hole is arranged on the top core-shifting process threaded hole,
characterized in that the method comprises the steps of:
s1, fixing a processed lens into a corresponding lens seat to form a lens group;
s2, processing the lens group, adjusting the optical axis of the lens by using the internal focusing auto-collimator, and turning the outer circle of the lens group by using a turning tool on a main shaft of a centering lathe to enable the main shaft of the lathe, the optical axis of the lens and the three axes of the internal focusing auto-collimator to be coaxial;
s3, turning the end face of the lens group to meet the design requirement, and observing an internal centering instrument while adjusting to ensure the coaxiality and interval requirements between lenses; glue injection holes are formed in the outer circumference of the lens cone and correspond to the lens group, and are used for fixing the adjusted lens group;
s4, sequentially assembling the processed lens groups into a lens barrel, and fixing all the lens groups into the lens barrel by using a lens barrel pressing ring after adjusting the lens groups into place;
s5, detecting the change of the optical axis deflection angles of the whole lens and each lens group, and then rotating the lens group according to the optical axis deflection angles of the lens group so that the optical axis deflection angles are mutually offset;
s6, adjusting jackscrews corresponding to the lens groups on the lens barrel to enable each lens group of the whole lens to be consistent with an optical axis of the lens barrel, and then injecting glue for curing; ensuring that the offset angle errors of the whole installed lens can be mutually offset in the change of the ambient temperature;
in the step S5, the lens is subjected to thermal analysis, the deflection angle direction and the deflection angle size of the optical axis are measured, and the positions corresponding to the circumferences in the deflection angle direction are marked and then used as the bottom of the lens barrel; the lens is adjusted in sequence, and the specific adjustment steps are as follows:
a1 According to the sequence of installing the lens barrel, sequentially rotating the lens groups for 360 degrees, searching the position on the circumference corresponding to the maximum direction of the optical axis deflection of each lens group, and recording the maximum deflection angle value, wherein the position of the maximum deflection angle on the circumference of the first lens group is used as the bottom to coincide with the bottom of the lens barrel;
a2 And then the optical axis of the second group of lens is adjusted by rotating the second group of lens with the first group of lens as a reference, the position of the maximum angle of the optical axis deflection direction of the second group of lens is opposite to the position of the maximum angle of the first group of lens, so that the angles of deflection are offset to be minimum, the next group of lens is adjusted in sequence, the position of the maximum angle of the optical axis deflection direction of the optical axis of the next group of lens is opposite to or the same as the previous group of lens in the rotating process of the lens, and the tolerance is kept within 30 minutes, so that the maximum angles of deflection of the lens are offset to each other.
2. The processing method for realizing high-precision imaging lens as claimed in claim 1, wherein the processing method comprises the following steps: the end face of the outer side face of the lens group in the sequence outer side is provided with a protrusion or a pit, in the installation process, a matched tool is utilized in the installation process, so that the whole lens group can rotate, the optical axis angle direction of the lens group can be adjusted, and the rotating lens group meets the requirements.
3. The processing method for realizing high-precision imaging lens as claimed in claim 1, wherein the processing method comprises the following steps: the lens barrel is provided with a step corresponding to the lens group, and a circle of lubricating glue is coated at the middle position of the outer periphery of the lens group before the lens group is assembled to the step, so that the lens barrel is convenient to rotate and adjust.
4. A method for realizing a high-precision imaging lens according to any one of claims 1 to 3, characterized in that: the imaging device is provided with a lens rear end, the imaging device comprises a photosensitive device, the photosensitive device is designed into a curved surface, and the curved surface is an aspheric surface.
5. A method for realizing a high-precision imaging lens according to any one of claims 1 to 3, characterized in that: the imaging device is provided with a lens rear end, and comprises a photosensitive layer which is arranged to form a paraboloid radially outwards from a center point.
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| JP2004294874A (en) * | 2003-03-27 | 2004-10-21 | Canon Inc | Image reading lens unit |
| JP2012042540A (en) * | 2010-08-13 | 2012-03-01 | Fujifilm Corp | Lens barrel provided with eccentricity adjusting mechanism |
| CN103246041A (en) * | 2013-05-15 | 2013-08-14 | 河南平原光电有限公司 | Objective lens assembly process |
| CN110524363A (en) * | 2019-08-29 | 2019-12-03 | 深圳市灿锐科技有限公司 | A method of realizing that camera lens high-precision is imaged |
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