CN113655585B - Method for adjusting and detecting zoom imaging lens - Google Patents
Method for adjusting and detecting zoom imaging lens Download PDFInfo
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- CN113655585B CN113655585B CN202110858537.1A CN202110858537A CN113655585B CN 113655585 B CN113655585 B CN 113655585B CN 202110858537 A CN202110858537 A CN 202110858537A CN 113655585 B CN113655585 B CN 113655585B
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- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
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- G—PHYSICS
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- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/62—Optical apparatus specially adapted for adjusting optical elements during the assembly of optical systems
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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
- G02B7/04—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification
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Abstract
The invention provides an assembly and detection method of a zoom imaging lens, which solves the problems of low image quality, low assembly efficiency and repeated assembly and disassembly of the existing zoom lens caused by cam curve processing errors and moving lens group posture changes. The method is an assembly and simulation synchronous iteration adjustment method, the method obtains the variation of the posture of each moving lens group in the moving process, and the variation is subjected to optical simulation analysis to evaluate the lens transfer function and the visual axis jumping quantity, and meanwhile, the method can also measure the key part parameter cam curve of the zooming system, and can evaluate the performance of the imaging system more accurately.
Description
Technical Field
The invention belongs to the field of zoom optical imaging, and particularly relates to an adjusting and detecting method of a zoom imaging lens.
Background
During the assembly of the optical lens, it is necessary to ensure that the optical center and the mechanical center of each lens glass are coaxial. When each movable lens group is static, the coaxiality of the optical center and the mechanical axis can be ensured through centering processing. However, when the movable lens group moves in the main lens barrel according to the cam curve, due to the gaps existing between the moving parts, the postures of the movable lens group change, and the changes of the postures bring about the problems of out-of-tolerance of visual axis jump, poor image plane consistency and the like, so that the imaging quality is not high.
When the cam curve directly determines the focal length of the zoom imaging system, the relative position between the moving lens groups and the difference of the relative position directly affect the accurate position of the image plane, so the processing precision of the cam curve also directly affects the image plane consistency parameters of the zoom imaging system, and the imaging image quality is not high. In the past, after a later-stage image is generated, if the image quality is low and the visual axis jump is obvious, an optical lens needs to be repeatedly disassembled and assembled to find a solution, so that the assembly efficiency of the lens is low, the operation in the whole process is complex, time and labor are wasted, and even the problem cannot be solved even if the optical lens is repeatedly disassembled and assembled for many times.
Chinese patent CN110954084A discloses a posture measuring device and method for a movable lens group, which can measure the visual axis bounce amount and system transfer function change diagram of the movable lens group, but the device has single measurement data, lacks the error study of the optical axis direction of the movable lens group, and is not accurate enough for evaluating the performance of the imaging system, and the method can only measure a single lens group at each time, when measuring the second lens group, the first lens group needs to be removed, and the moving of the fixed component may be brought in the removing process, thereby affecting the measurement result.
Disclosure of Invention
The invention aims to solve the problems of low image quality, low assembly efficiency and repeated disassembly and assembly of the conventional zoom lens caused by cam curve processing errors and moving lens group posture changes, and provides an assembly and detection method of a zoom imaging lens. The method is an assembly and simulation synchronous iteration adjustment method, the method obtains the variation of the posture of the moving lens group in the moving process, and the variation is subjected to optical simulation analysis to evaluate the lens transfer function and the visual axis jumping quantity, and meanwhile, the key part parameter cam curve of the zooming system can be measured, so that the performance of the imaging system can be evaluated more accurately.
In order to achieve the above purpose, the technical scheme of the invention is as follows:
a method for adjusting and detecting a zoom imaging lens comprises the following steps:
step one, building a debugging system;
the debugging system comprises a first laser ranging theodolite, a second laser ranging theodolite, a first attitude adjusting platform, a second attitude adjusting platform, a lifting platform, a reference tool, a zoom group measuring tool and a compensation group measuring tool;
the first attitude adjusting platform is arranged below the first laser range-finding theodolite, the second attitude adjusting platform is arranged below the second laser range-finding theodolite, and the lifting platform is arranged below the zoom lens;
fixing the zoom lens to avoid displacement change of the zoom lens;
the zoom lens comprises a main lens cone, a movable lens group, a zoom cam and a motor, wherein the movable lens group is arranged in the main lens cone and comprises a zoom lens group and a compensation lens group, and the motor drives the zoom cam to rotate so as to drive the movable lens group to do linear motion in the main lens cone along the axial direction;
thirdly, mounting the reference tool at the front end of the main lens barrel, and enabling a mechanical shaft of the main lens barrel to be coaxial with an optical shaft of the reference tool;
fourthly, adjusting the postures of the first laser ranging theodolite and the second laser ranging theodolite to enable the optical axes of the first laser ranging theodolite and the second laser ranging theodolite to be coaxial with the optical axis of the reference tool, and recording distance measurement values LA and LB of the first laser ranging theodolite and the second laser ranging theodolite, wherein the distance between the first laser ranging theodolite and the second laser ranging theodolite is LA + LB + d, and d is the lens thickness of a cross reference plane reflector of the reference tool;
fifthly, fixing the postures of the first laser ranging theodolite, the second laser ranging theodolite and the zoom lens, recording a reference value, and then taking down a reference tool, wherein the reference value comprises a reference angle posture value and a reference offset posture value;
sixthly, mounting the zoom lens group and the compensation lens group into the main lens cone, mounting the zoom lens group measuring tool at the front end of the zoom lens group, and enabling a mechanical shaft of the zoom lens group to be coaxial with an optical shaft of the zoom lens group measuring tool; mounting a compensation group measuring tool at the front end of a compensation lens group, wherein a mechanical shaft of the compensation lens group is coaxial with an optical axis of the compensation group measuring tool;
step seven, arranging the zoom cam at a short-focus position, driving a motor to a long-focus position step by step, recording the rotation angle of the zoom cam at each step, and simultaneously recording distance readings La and Lb of a first laser ranging theodolite and a second laser ranging theodolite corresponding to each step, so as to calculate the distance between the zoom lens group and the compensation lens group when the zoom cam rotates at each angle, wherein the distance is equal to LA + LB + d-La-Lb-d2, so as to fit a zoom cam curve, and d2 is the thickness of a lens of a cross-wire measuring plane mirror of the compensation group measuring tool;
step eight, comparing the zoom cam curve obtained in the step seven with a cam design curve, if the difference value is within a set threshold value, executing the step eight, if the difference value exceeds the set threshold value, correcting the zoom cam until the difference value is within the set threshold value, and then executing the step eight;
step nine, setting the zoom lens cam at a short focus position again, driving the motor to a long focus position step by step, recording attitude information readings of the zoom lens group and the compensation lens group measured by the first laser ranging theodolite and the second laser ranging theodolite during each step, comparing the attitude information readings with a reference value to obtain angle attitude numerical values and offset attitude numerical values of the zoom lens group and the compensation lens group, simultaneously obtaining a measured distance between the zoom lens group and the compensation lens group, and comparing the measured distance with a theoretical distance between the zoom lens group and the compensation lens group to obtain a difference value delta d;
and step ten, substituting the angle attitude numerical values, the offset attitude numerical values and the difference value delta d of the zoom lens group and the compensating lens group into CodeV optical design software to obtain the system visual axis jumping amount and the defocusing amount.
Further, in the seventh step, the rotation angle range of the zoom cam is 0 to 60 °, the rotation angle of the motor is 240 °, and the driving step of the motor is set to 10 °.
Furthermore, scales are arranged on the cross wire measuring plane reflector of the compensation group measuring tool and the zooming group measuring tool, and the precision is at least 0.003 mm.
Compared with the prior art, the technical scheme of the invention has the following advantages:
1. the method of the invention measures and evaluates the moving posture of each moving lens group before the optical lens is installed, and measures the processing precision of the cam curve, thereby avoiding repeated disassembly in the final assembly process and improving the assembly efficiency.
2. The method measures the machining precision of the cam curve in advance, and corrects the cam curve by comparing the measured value with the designed value, so that the error of the movement of the movable lens group along the optical axis can be reduced, and the performance of the imaging system can be more accurately evaluated.
3. The method adopts two theodolites, can simultaneously measure the postures of the zoom group and the compensation group, avoids the step of dismantling different lens groups, does not change the position of the fixed part of each lens group, and improves the measurement result.
4. The device adopted by the method has the advantages of simple structure, easy operation, simple control and high measurement precision, and can obtain a measurement result with higher precision by reducing the driving step length of the driving motor.
5. The method has the advantages of low processing cost and simple assembly test by adopting the tool, and can be widely applied to the assembly process of various zoom lenses by designing different tools.
Drawings
FIG. 1 is a schematic structural diagram of a conventional zoom lens;
FIG. 2 is a schematic diagram of the assembly and adjustment of a reference tool in the method of the present invention;
FIG. 3 is a schematic view of the zoom group measurement tool during assembly and adjustment in the method of the present invention;
FIG. 4 is a schematic view of the measurement tool of the compensation group during assembly and adjustment in the method of the present invention;
FIG. 5a is a schematic structural view of a reference fixture according to the present invention;
FIG. 5b is a schematic view of a datum fixture and centering thereof according to the present invention;
FIG. 6a is a schematic structural view of a cross wire measuring tool according to the present invention;
FIG. 6b is a schematic view of the cross wire measuring tool and its centering according to the present invention;
FIG. 7 is a schematic view showing an assembly relationship of a main lens barrel, a movable lens group and a cross fixture in the present invention;
FIG. 8a is a schematic diagram showing the relationship between the movement of the zoom lens set and the movement of the compensation lens set according to the present invention;
FIG. 8b is a schematic diagram of the relationship between the movement of the zoom lens set and the movement of the compensation lens set according to the present invention;
FIG. 8c is a schematic diagram of the relationship between the movements of the zoom lens set and the compensation lens set according to the present invention.
Reference numerals are as follows: 1-a first laser ranging theodolite, 2-a second laser ranging theodolite, 3-a reference tool, 4-a zoom lens, 5-a first posture adjusting platform, 6-a second posture adjusting platform, 7-a lifting platform, 8-a zoom group measuring tool, 9-a compensation group measuring tool and 10-a zoom lens; 31-a reference lens frame, 32-a reference pressing ring, 33-a cross wire reference plane reflecting mirror, 41-a main lens barrel, 42-a moving lens group, 43-a zoom cam, 44-a motor, 45-a feedback potentiometer, 46-a motor control circuit board, 47-a zoom lens barrel, 48-a compensation lens barrel, 81-a measuring lens frame, 82-a measuring pressing ring and 83-a cross wire measuring plane reflecting mirror.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention and are not intended to limit the scope of the present invention.
As shown in fig. 1, the conventional zoom imaging lens (i.e., zoom lens 4) includes a main barrel 41, a movable mirror group 42, a zoom cam 43, a motor 44, a feedback potentiometer 45, and a motor control circuit board 46; the movable lens group 42 is arranged in the main lens cone 41 and comprises a zoom lens group and a compensation lens group, the zoom lens group comprises a zoom lens cone 47 and zoom lenses arranged in the zoom lens cone 47, the compensation lens group comprises a compensation lens cone 48 and compensation lenses arranged in the compensation lens cone 48, and the zoom cam 43 is arranged on the periphery of the main lens cone 41; the motor control circuit board 46 controls the motor 44 to drive the zoom cam 43 to rotate, so as to drive the movable mirror group 42 to make linear motion in the main lens cone 41 along the axial direction; the feedback potentiometer 45 is used for feeding back the position of the moving mirror group 42.
The invention provides an assembly and detection method of the zoom imaging lens, and particularly relates to a method for adjusting image plane consistency and visual axis jump in the assembly and adjustment process of a zoom lens and measuring the curve precision of a key zoom cam. The method measures the posture of the movable lens group before the optical lens is installed, simulates and analyzes the problems of image surface consistency and visual axis jumping of the zoom optical lens through comparison and iteration of measurement parameters and design parameters, seeks a solution in advance, avoids repeated disassembly in the final assembly process and improves the assembly efficiency.
As shown in fig. 2 to 4, the adjusting and detecting method of the zoom imaging lens of the present invention is implemented based on an adjusting system. The debugging system comprises a first laser ranging theodolite 1, a second laser ranging theodolite 2, a first posture adjusting platform 5, a second posture adjusting platform 6, a lifting platform 7, a reference tool 3, a zoom group measuring tool 8 and a compensation group measuring tool 9. The first posture adjustment platform 5 and the second posture adjustment platform 6 can be three-point posture adjustment platforms, and the eyepiece parts of the first laser ranging theodolite 1 and the second laser ranging theodolite 2 are provided with a doubling mirror 10.
Above-mentioned first laser rangefinder theodolite 1, second laser rangefinder theodolite 2 is the gesture information measuring instrument of zoom lens group and compensation mirror group for measure the gesture of zoom lens group and compensation mirror group, first gesture adjustment platform 5 sets up in first laser rangefinder theodolite 1 below, is used for adjusting the gesture of first laser rangefinder theodolite 1, and second gesture adjustment platform 6 sets up in second laser rangefinder theodolite 2 below, is used for adjusting the gesture of second laser rangefinder theodolite 2. The zoom lens 4 is an acting object, and the lifting platform 7 is arranged below the zoom lens 4 and used for adjusting the posture of the zoom lens 4; the benchmark frock 3 is installed at the front end of main lens cone 41 for provide the measurement benchmark of first laser rangefinder theodolite 1, second laser rangefinder theodolite 2, the variable power group measures frock 8 and installs at variable power group front end, be used for changeing variable power group gesture information to carry out the measurement on the variable power group measures frock 8, compensation group measures frock 9 and installs at compensation group front end, be used for changeing compensation group gesture information to carry out the measurement on the compensation group measures frock 9.
As shown in fig. 5a and 5b, the reference fixture 3 of the present invention includes a reference frame 31, a reference pressing ring 32, and a cross reference plane mirror 33. The cross-hair reference plane reflecting mirror 33 is mounted in the reference mirror frame 31 with glue, fixed by the reference pressing ring 32, and after the glue is dried, centering is performed. The reference tool 3 measures the diameter of the inner hole at the front end of the main lens barrel 41 by taking the optical center of the cross reference plane reflector 33 as a reference, the size B of the reference lens frame 31 and the inner hole at the front end of the main lens barrel 41 are matched, the unilateral clearance is not more than 0.01mm, the position D of the reference lens frame 31 is processed, and the concentricity between the position D and the reference A is not more than 0.01 mm; the reference frame 31E is processed to ensure that the perpendicularity between the reference frame and the reference A is not more than 0.01mm, the flange is cut off along the C position, and the centering of the reference tool 3 is completed.
As shown in fig. 6a and 6b, the variable-magnification group measuring tool 8 includes a measuring lens frame 81, a measuring pressing ring 82, and a cross measuring plane mirror 83, and the cross measuring plane mirror 83 has a scale with a precision of 0.003 mm. The measuring frame 81 is provided with 4 countersunk holes for mounting M1.6 screws, and the 4 countersunk holes are uniformly distributed and used for fixing the zoom group measuring tool 8 on the corresponding zoom lens barrel 47. The cross-wire measuring plane mirror 83 is mounted on the measuring mirror frame 81 with glue, fixed by the measuring pressing ring 82, and centered after the glue dries out. The zoom group measuring tool 8 measures the diameter of the inner hole of the zoom lens barrel 47 by taking the optical center of the cross wire measuring plane reflector 83 as a reference, and the dimension B of the measuring lens frame 81 and the inner hole of the zoom lens barrel 47 are matched to ensure that the unilateral clearance is not more than 0.01 mm; processing the position D of the measuring lens frame 81 to ensure that the concentricity of the measuring lens frame and the reference A is not more than 0.01 mm; processing the position E of the measuring mirror frame 81 to ensure that the perpendicularity between the measuring mirror frame and the reference A is not more than 0.01 mm; and C, cutting off the flange, and finishing the centering of the variable-magnification group measuring tool 8.
The compensation group measuring tool 9 and the zoom group measuring tool 8 have the same structure and comprise a measuring mirror frame, a measuring pressing ring and a cross wire measuring plane reflector; the compensation group measuring tool 9 measures the diameter of an inner hole of the compensation lens cone 48 by taking the optical center of the cross wire measuring plane reflector as a reference, and the dimension B of the measuring lens frame and the inner hole of the compensation lens cone 48 are matched to ensure that the unilateral clearance is not more than 0.01 mm; processing the position D of the measuring mirror frame to ensure that the concentricity of the measuring mirror frame and the reference A is not more than 0.01 mm; processing the position E of the measuring mirror frame to ensure that the verticality between the measuring mirror frame and the reference A is not more than 0.01 mm; and cutting the flange along the position C, and finishing the centering of the compensation group measuring tool 9 at the moment.
Based on the system and the device, the invention provides a method for adjusting and detecting a zoom imaging lens, which comprises the following steps:
step one, building the debugging system;
fixing the zoom lens 4 on the lifting platform 7, and fixing the lifting platform 7 to avoid the zoom lens 4 from generating displacement change;
step three, as shown in fig. 7, since the main barrel 41 of the zoom lens 4 can ensure that the coaxiality of the inner circle of the focusing part and the inner circle of the zooming part is not more than 1 filament in the processing process, the front end and the rear end of the mechanical shaft of the main barrel 41 can be considered to be coaxial, the reference tool 3 is installed at the front end of the main barrel 41, the mechanical shaft of the main barrel 41 is led out, and the mechanical shaft of the main barrel 41 is coaxial with the optical shaft of the reference tool 3;
fourthly, adjusting the postures of the first laser ranging theodolite 1 and the second laser ranging theodolite 2 to enable the optical axes of the first laser ranging theodolite 1 and the second laser ranging theodolite 2 to be coaxial with the optical axis of the reference tool 3, recording distance measurement values LA and LB of the first laser ranging theodolite 1 and the second laser ranging theodolite 2, and if the thickness of a lens of a cross reference plane reflector 33 of the reference tool 3 is d, the distance between the first laser ranging theodolite 1 and the second laser ranging theodolite 2 is LA + LB + d, as shown in fig. 8 a;
fifthly, fixing the postures of the first laser ranging theodolite 1, the second laser ranging theodolite 2 and the zoom lens 4, taking down a reference tool 3, and recording a reference value before taking down the reference tool, wherein the reference value refers to the deviation between a cross wire of the reference tool, a cross wire of the first laser ranging theodolite and a cross wire of the second laser ranging theodolite, reflected images of the reference tool, the deviation between the cross wire of the theodolite and the reflected images is a reference angle posture value, and the deviation between the cross wire of the theodolite and the cross wire of the reference tool is a reference offset posture value;
and step six, mounting the zoom lens group and the compensation lens group into the main lens cone 41, wherein the outer diameters and the coaxiality of the inner holes of the zoom lens cone 47 and the compensation lens cone 48 are not more than 1 wire, so that the zoom lens cone and the compensation lens cone can be considered to be coaxial. As shown in fig. 3, the zoom group measurement tool 8 is installed at the front end of the zoom lens group, and is fixed by 4M 1.6 countersunk head screws, and the mechanical axis of the zoom lens group is led out and is coaxial with the optical axis of the zoom group measurement tool 8; as shown in fig. 4, the compensation group measurement tool 9 is installed at the front end of the compensation lens group, fixed by 4M 1.6 countersunk screws, and the mechanical shaft of the compensation lens group is led out and coaxial with the optical shaft of the compensation group measurement tool 9;
seventhly, operating a driving motor 44, moving the zoom cam 43 to a short focal length position, driving the motor 44 step by step towards a long focal length position by taking the short focal length position of the zoom lens 4 as a starting point, recording the rotating angle of the zoom cam 43 at each step, wherein the rotating angle at each step corresponds to the corresponding focal length value of the zoom lens 4, and simultaneously recording distance readings La and Lb of the first laser ranging theodolite 1 and the second laser ranging theodolite 2 at each step, so that the distance between the zoom lens group and the compensation lens group is calculated when the zoom cam 43 rotates at different angles (namely when each focal length value of the zoom lens 4) so as to fit a curve of the zoom cam 43, and the machining precision of the cam curve can be obtained after comparing the fitted curve with the designed curve;
during testing, the focal length range of the zoom lens 4 is 24 mm-120 mm, the pixel size is 3.45um, the rotation angle of the motor 44 is 240 degrees, the driving step length of the motor 44 is set to be 10 degrees, the rotation angle range of the zoom cam 43 is 0-60 degrees, the gear transmission ratio of the motor 44 gear to the zoom cam 43 gear is 4:1, the rotation step length of the zoom cam 43 is 2.5 degrees, the focal length of the zoom lens 4 is changed from a short focus of 24mm to a long focus of 120mm in the rotation process of the zoom cam 43 from 0-60 degrees, but the change of the focal length is nonlinear, the angle value is taken as a horizontal coordinate, the position information of the zoom cam 43 at each step angle is taken as a vertical coordinate, a curve is drawn, the curve is a measured fitting curve of a cam curve, and the fitting curve is compared with a design curve, so that the processing precision of the cam curve can be obtained;
for example, the position of the first laser ranging theodolite 1 is taken as a zero position, data conversion is performed on the motion position of the compensating mirror group, and a schematic position conversion diagram is shown in fig. 8b and 8 c: position information of the compensating mirror group relative to the first laser ranging theodolite 1: LA + LB + d-LB-d2, wherein LA is 150mm, LB is 200mm, and d is d2 is 2 mm; the position information of the zoom lens group relative to the first laser ranging theodolite 1: la, wherein the distance between the zoom lens group and the compensation lens group is LA + LB + d-La-Lb-d 2;
the position measurement data of the compensating lens group and the zoom lens group are converted by the formula to obtain the following table:
step eight, drawing a cam detection value curve by using EXCEL, comparing the cam detection value curve with a cam design value curve, executing the step eight if the difference value is within a set threshold value, and correcting the zoom cam 43 until the difference value is within the set threshold value if the difference value exceeds the set threshold value, and then executing the step eight;
from the comparison result, the trend of the cam curve detection parameters is consistent with the trend of theoretical design, the maximum deviation is not more than 8 threads, and the curve processing precision meets the requirement.
Step nine, setting the cam curve of the zoom lens 4 at a short-focus position, driving the motor 44 to a long-focus position step by step, recording the posture information readings of the zoom lens group and the compensation lens group measured by the first laser distance-measuring theodolite 1 and the second laser distance-measuring theodolite 2 at each step, comparing the posture information readings with a reference value, and solving the difference value theta X 、θ Y 、d X、 、d Y The difference value is an angle attitude numerical value and an offset attitude numerical value, and meanwhile, the difference value delta d between the measured distance and the theoretical distance between the zoom lens group and the compensation lens group can be obtained;
since the optical axes of the first laser range theodolite 1 and the second laser range theodolite 2 are adjusted and superposed with the optical axis of the zoom lens 4 before measurement, the reference values are (0,0,0,0), wherein the first two 0 values refer to reference angle attitude values, and the last two 0 values refer to reference offset attitude values;
installing a doubling mirror 10 at the ocular of the first laser ranging theodolite 1 and the second laser ranging theodolite 2, driving a motor 44 step by step from a short focus, wherein each step corresponds to a corresponding focal distance value, adjusting the first laser ranging theodolite 1 and the second laser ranging theodolite 2 to enable the optical axes of the theodolites and the moving mirror group 42 to be coaxial, recording the readings of the first laser ranging theodolite 1 and the second laser ranging theodolite 2 at the moment, comparing the readings with a reference value angle posture value, and measuring an X-axis angle deviation and a Y-axis angle deviation to obtain the angle posture value of the moving mirror group 42;
adjusting the focal lengths of the first laser range theodolite 1 and the second laser range theodolite 2, ensuring that the measuring tool cross wire with scales is clear in imaging, recording the X-axis offset and the Y-axis offset between the time-varying group measuring tool cross wire and the cross wire of the first laser range theodolite 1 at each step, simultaneously recording the X-axis offset and the Y-axis offset between the time-varying group measuring tool cross wire and the cross wire of the second laser range theodolite 2 at each step, and comparing the X-axis offset/the Y-axis offset with a reference value to obtain the offset attitude numerical value of the time-varying lens group and the offset attitude numerical value of the compensation lens group;
meanwhile, acquiring a difference delta d between a measured distance and a theoretical distance between the asynchronous long-time zoom lens group and the compensating lens group, wherein different step lengths correspond to different focal lengths;
the measurement distance between the zoom lens group and the compensation lens group is as follows: l is a radical of an alcohol A +L B +d-L a -L b -d 2
And attitude measurement data of the zoom lens group:
and (3) compensating attitude measurement data of the lens group:
step ten, substituting angle attitude numerical values, deviation attitude numerical values and difference delta d data between the measured distance and the theoretical distance of the zoom lens group and the compensating lens group into CodeV optical design software to obtain the visual axis runout amount and the defocusing amount of the system; as shown in the following table:
from the optical fitting result, the maximum defocusing amount is 1 filament, the imaging quality is not greatly influenced in the focal depth range of the imaging system, the visual axis jump Y direction is 2.3 pixels at the maximum, and the index requirement can be met.
In the prior art, only the influence of the attitude change of the movable lens group on the visual axis jumping and the imaging quality is involved, but the movement error delta d of the movable lens group along the optical axis direction is not measured, and the error can also influence the visual axis jumping and the imaging quality. The moving error of the moving lens group along the optical axis is mainly related to the processing precision of the cam curve, so the method measures the processing precision of the cam curve in advance, and by comparing the measured value with the designed value, if the difference is large, the imaging system is proved not to generate good imaging performance, and the cam curve needs to be corrected and then used; if the difference between the measured value and the designed value is not large, the difference can be brought into code software together with the attitude error information of the movable mirror group for simulation analysis.
The method adopts two theodolites, can simultaneously measure the postures of the zoom group and the compensation group, avoids the step of dismantling different lens groups, does not change the position of the fixed part of each lens group, and further improves the measurement result.
The method has the advantages of simple structure, easy operation, simple control and high measurement precision, and can obtain a measurement result with higher precision by reducing the motor driving step length.
The tool of the method is low in processing cost and simple in assembly test, and can be widely applied to the assembly process of various zoom lenses by designing different tools.
By the measuring method, the moving postures of the moving lens groups are measured and evaluated on the premise of optical framing, and meanwhile, the cam curve machining precision is measured, so that repeated disassembly in the final assembly process can be avoided, and the assembly efficiency is improved.
Claims (3)
1. A method for adjusting and detecting a zoom imaging lens is characterized by comprising the following steps:
step one, building a debugging system;
the debugging system comprises a first laser ranging theodolite, a second laser ranging theodolite, a first posture adjusting platform, a second posture adjusting platform, a lifting table, a reference tool, a zoom group measuring tool and a compensation group measuring tool;
the first posture adjusting platform is arranged below the first laser ranging theodolite, the second posture adjusting platform is arranged below the second laser ranging theodolite, and the lifting platform is arranged below the zoom lens;
fixing the zoom lens to avoid displacement change of the zoom lens;
the zoom lens comprises a main lens cone, a movable lens group, a zoom cam and a motor, wherein the movable lens group is arranged in the main lens cone and comprises a zoom lens group and a compensation lens group, and the motor drives the zoom cam to rotate so as to drive the movable lens group to do linear motion in the main lens cone along the axial direction;
thirdly, mounting the reference tool at the front end of the main lens barrel, and enabling a mechanical shaft of the main lens barrel to be coaxial with an optical shaft of the reference tool;
fourthly, adjusting the postures of the first laser ranging theodolite and the second laser ranging theodolite to enable the optical axes of the first laser ranging theodolite and the second laser ranging theodolite to be coaxial with the optical axis of the reference tool, and recording distance measurement values LA and LB of the first laser ranging theodolite and the second laser ranging theodolite, wherein the distance between the first laser ranging theodolite and the second laser ranging theodolite is LA + LB + d, and d is the lens thickness of a cross reference plane reflector of the reference tool;
fifthly, fixing the postures of the first laser ranging theodolite, the second laser ranging theodolite and the zoom lens, recording a reference value, and then taking down a reference tool, wherein the reference value comprises a reference angle posture value and a reference offset posture value;
sixthly, mounting the zoom lens group and the compensation lens group into the main lens cone, mounting the zoom lens group measuring tool at the front end of the zoom lens group, and enabling a mechanical shaft of the zoom lens group to be coaxial with an optical shaft of the zoom lens group measuring tool; mounting a compensation group measuring tool at the front end of a compensation lens group, wherein a mechanical shaft of the compensation lens group is coaxial with an optical axis of the compensation group measuring tool;
step seven, arranging the zoom cam at a short-focus position, driving a motor to a long-focus position in steps, recording the rotation angle of the zoom cam at each step, and simultaneously recording distance readings La and Lb of a first laser ranging theodolite and a second laser ranging theodolite corresponding to each step, so as to calculate the distance value between the zoom lens group and the compensation lens group when the zoom cam rotates at each angle, wherein the distance value is LA + LB + d-La-Lb-d2, and further fit a zoom cam curve, and d2 is the lens thickness of the cross-wire measuring plane mirror of the compensation group measuring tool;
step eight, comparing the zoom cam curve obtained in the step seven with a cam design curve, if the difference value is within a set threshold value, executing the step eight, if the difference value exceeds the set threshold value, correcting the zoom cam until the difference value is within the set threshold value, and then executing the step eight;
step nine, setting the zoom lens cam at a short focus position again, driving the motor to a long focus position step by step, recording attitude information readings of the zoom lens group and the compensation lens group measured by the first laser ranging theodolite and the second laser ranging theodolite during each step, comparing the attitude information readings with a reference value to obtain angle attitude numerical values and offset attitude numerical values of the zoom lens group and the compensation lens group, simultaneously obtaining a measured distance between the zoom lens group and the compensation lens group, and comparing the measured distance with a theoretical distance between the zoom lens group and the compensation lens group to obtain a difference value delta d;
and step ten, substituting the angle attitude numerical values, the offset attitude numerical values and the difference value delta d of the zoom lens group and the compensating lens group into CodeV optical design software to obtain the visual axis jumping amount and the defocusing amount of the zoom lens.
2. The method of adjusting and detecting a zoom imaging lens of claim 1, wherein: in the seventh step, the rotation angle range of the zoom cam is 0-60 degrees, the rotation angle of the motor is 240 degrees, and the driving step length of the motor is set to 10 degrees.
3. A method of adjusting and detecting a zoom imaging lens according to claim 1 or 2, characterized in that: the cross wire measuring plane reflector of the compensation group measuring tool and the zooming group measuring tool is provided with scales, and the precision is at least 0.003 mm.
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