CN110514409A - A kind of quality inspection method and device of laser direct imaging camera lens - Google Patents
A kind of quality inspection method and device of laser direct imaging camera lens Download PDFInfo
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- G—PHYSICS
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
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- G—PHYSICS
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
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- G01M11/0242—Testing optical properties by measuring geometrical properties or aberrations
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- G—PHYSICS
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
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Abstract
The present invention relates to a kind of quality restriction device and methods of laser direct imaging camera lens, its method includes: that (1) detects the imaging acutance of imaging lens: calculating imaging acutance, obtain the maximum value in imaging acutance, the maximum value that acutance is imaged and imaging acutance index value are compared, if the maximum value that acutance is imaged is less than imaging acutance index value, then the imaging acutance of imaging lens cannot be met the requirements, and otherwise, be considered as qualification；(2) detection to pattern generator rigging position: by the imaging acutance of calculating, the maximum corresponding H axial coordinate of imaging sharpness value is found, which is optimum intersection figure generator position；(3) to the detection of shot field curvature；(4) detection of aberration rate and multiplying power: best acutance X axis coordinate is found, fall in centre coordinate in viewing field of camera, mobile Y, Z axis to designated position, the coordinate value after recording movement every time, it calculates actual range between each label and practical multiplying power and compared with theoretical value, judges camera lens abnormal rate.
Description
Technical Field
The invention relates to the technical field of imaging lens detection, in particular to a quality inspection method and device for a laser direct imaging lens.
Background
In the field of laser direct imaging, an imaging lens requires small distortion and large focal depth, so that a double telecentric result is generally designed. In the assembly of the lens, the final imaging quality is affected by the installation position of the lens, the distance between the pattern generator and the objective lens and the horizontal degree, and the final imaging quality can be reflected on parameters such as imaging sharpness, field curvature, distortion, focal length and multiplying power. Parameters including sharpness, curvature of field, distortion, focus, magnification, etc. of the image are detected or adjusted when the imaging system is mounted on the machine. As shown in fig. 2, d denotes an imaging lens, 10 denotes an objective lens, 11 denotes an image-side objective lens, and 12 denotes a focal plane.
Imaging sharpness: the definition of the image plane imaging is formed; field curvature: and verifying whether the imaging surface is in plane distribution or approximately in plane distribution. Generally, the curvature of field is required to be not more than 1/2 image-wise depth of focus. Distortion: verifying the deformation degree after passing through the optical system, wherein the distortion of the optical system is generally not higher than 1/10000; focal length: when a multi-head works, the working surfaces are required to be on the same level, and the focal length of the lens must be measured.
In a real environment, verification of off-line measurement of the above-mentioned indexes generally depends on verification by an optical engineer, and is difficult to standardize and quantify, and is not suitable for detection requirements in mass production. Meanwhile, when the imaging lens detected by an optical engineer is installed in the laser direct imaging device, a large amount of actions such as focal plane debugging, magnification adjustment and the like are required.
Disclosure of Invention
The invention aims to provide a quality inspection method and a quality inspection device for a laser direct imaging lens, which can verify the quality of the imaging lens and can adjust the lens multiplying power in advance in an off-line mode.
In order to achieve the purpose, the invention adopts the following technical scheme:
a quality inspection method of a laser direct imaging lens comprises the following steps:
(1) detecting the imaging sharpness of the imaging lens: calculating the imaging sharpness, acquiring the maximum value in the imaging sharpness, comparing the maximum value of the imaging sharpness with the imaging sharpness index value, if the maximum value of the imaging sharpness is smaller than the imaging sharpness index value, determining that the imaging sharpness of the imaging lens cannot meet the requirement, otherwise, determining that the imaging sharpness is qualified;
(2) detection of pattern generator mounting position: finding the H-axis coordinate corresponding to the maximum imaging sharpness value through the calculated imaging sharpness, wherein the H-axis coordinate is the position of the optimal pattern generator;
(3) and (3) detecting the curvature of field of the lens: finding a clear imaging position XOn the upper part、XLower part、XLeft side of、XRight side、XInIf the following conditions are met, the field curvature of the lens is qualified:
and is(i ═ up, down, left, right)
Wherein d is1And designing the focal depth for the image space, namely representing the qualification of the curvature of field of the lens.
(4) Finding the best acutance X-axis coordinate, making the center coordinate fall in the camera visual field, moving Y, Z axes to the appointed position, recording the coordinate value after each movement, calculating the actual distance and the actual multiplying power between each mark according to the coordinate value, comparing the actual distance and the actual multiplying power with the theoretical value, and judging the lens distortion rate.
In the above scheme, in the step (1), the detecting of the imaging sharpness of the imaging lens specifically includes the following steps:
(11) setting the increment direction of the X axis to be consistent with the increment of the distance from the camera imaging surface to the image side objective lens;
(12) moving Y, Z the axis so that the camera imaging plane center substantially coincides with the lens center;
(13) moving the X axis to enable the distance from the imaging surface of the camera to the image side objective lens to be any value within a specified range, obtaining a graph at the value, and recording the X coordinate and the imaging sharpness value at the moment;
(14) and finding out the maximum sharpness value in the values, namely the optimal imaging sharpness of the imaging lens.
In the above scheme, in the step (2), the detecting of the assembling position of the pattern generator specifically includes the following steps:
(21) the H axis is shifted so that the pattern generator is spaced from the objective lens by a distance f2Recording the coordinate of the H axis at the moment as HfWherein f is2A design distance representing an object focal length of the imaging lens;
(22) finding the clearest position of a lens, keeping X, Y, Z axes still, moving an H axis, simultaneously capturing images through an industrial camera, calculating imaging sharpness, and recording H axis coordinates and the imaging sharpness;
(23) repeating step (22) to find the maximum imaging sharpness KiAnd the corresponding H-axis coordinate is HiIs the optimal pattern generator position.
In the above scheme, the detecting the distortion rate and the magnification in the step (4) specifically includes the following steps:
(41) finding an X-axis coordinate when the sharpness is optimal, and then fixing the X-axis coordinate to be unchanged;
(42) moving Y, Z axis to make the center mark fall in the field of view of the industrial camera, and the center mark is at the center of the camera and records the coordinate value of current Y, Z;
(43) calculating the physical and chemical coordinate position of each central mark according to the theoretical magnification of the lens;
(44) respectively moving Y, Z axes to designated positions according to the coordinate values obtained in the step (42), enabling the center of the center coordinate to be located at the center of the industrial camera, and recording the Y, Z coordinate at the moment;
(45) and (5) calculating the actual distance and the actual magnification between the marks according to the coordinate values recorded in the step (42) and the step (43).
A quality inspection device for a laser direct imaging lens is characterized in that an X-axis moving device moving along the X-axis direction of a base, a Y-axis moving device moving along the Y-axis direction of the base, a Z-axis moving device moving along the Z-axis direction of the base and an H-axis moving device moving along the H-axis of the base are arranged on the base in a sliding manner; the X-axis moving device and the H-axis moving device are connected with the guide rail in a sliding mode, the Y-axis moving device is arranged on the X-axis moving device in a sliding mode, and the Z-axis moving device is arranged on the side face of the Y-axis moving device and corresponds to the H-axis moving device.
According to the technical scheme, the method replaces a human eye identification mode, is efficient and more accurate, and facilitates professional detection of the optical imaging lens by non-professionals.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is an imaging schematic of the present invention;
fig. 3 is a flow chart of the method of the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings:
as shown in fig. 1, the quality inspection apparatus for a laser direct imaging lens of the present embodiment includes a base 1, a guide rail 11 horizontally disposed on the base 1 along an X-axis direction thereof, an X-axis moving device 2 and an H-axis moving device 3 slidably connected to the guide rail 11 at two ends thereof, a Y-axis moving device 4 disposed on an upper side of the X-axis moving device 2 and moving along a Y-axis direction thereof, a Z-axis moving device disposed on a side of the Y-axis, and an industrial camera 8 mounted on a side of the Z-axis moving device; the imaging lens 5 of the detected object is installed on the guide rail 11 between the X-axis moving device 2 and the H-axis moving device 3 through the fixed support 6, the upper side of the imaging lens 5 is provided with a light source interface 52, the fixed support 6 is connected with the guide rail 11 in a sliding mode, the end portion of the imaging lens 5 is provided with a pattern generator 51 which is located on one side of the H-axis moving device 3, and when the imaging lens 5 moves towards the H-axis moving device 3, the pattern generator 51 can be located above the H-axis moving device 3. As shown in fig. 1, at the time of detection, the industrial camera 7 is attached to the inner side surface of the Y-axis moving device 4.
The X-axis moving device 2, the Z-axis moving device 7 and the lens fixing support 6 on the guide rail 11 can move left and right, the three devices can respectively use independent moving guide rails, in the embodiment, the three devices preferably share the moving guide rail 11, so that three better collinear X axes are assembled on the moving guide rail 11, the moving direction is consistent with the light path direction of a lens to be detected, the Y-axis moving device 4 is assembled on the X-axis moving device 2, the moving direction is vertical to the X-axis moving device, and the Y-axis moving device moves in a plane parallel to the moving system base 1; the Z-axis moving device 7 is mounted on the Y-axis moving device 4 in a direction perpendicular to a plane parallel to the motion system base 1 and perpendicular to the X, Y-axis moving direction. And an industrial camera 8 mounted on the Z-axis moving device 7 to face an imaging surface of the imaging lens 5. X, Y, Y, the industrial camera 8 can change its position in horizontal, left-right and up-down directions to cover the whole lens light-emitting surface.
The H-axis moving device 3 is movable in the direction of the moving guide a for driving the pattern generator 51 to move in the direction of the moving guide 11. The H-axis moving device 3 moves along the moving guide 11. The light-emitting surface of the pattern generator 51 faces the light-in surface of the lens. When the optimal pattern generation position is found, the imaging lens may be connected and fixed to the pattern generator 51 using a connecting member.
For qualified lens, the imaging sharpness of the imaging lens meets the imaging sharpness value under the same illumination condition and the same exposure time of the industrial cameraWherein,mean value, σ, of the best imaging sharpness of a lens to meet quality requirements under the same conditionskTo meet the standard deviation of best imaging sharpness of a lens for quality requirements,the minimum imaging sharpness index of the lens for meeting the quality requirement is obtained by practical production experience, and the optimal imaging sharpness of the imaging lens is lower than that of the imaging lensThe index indicates that the imaging quality of the imaging lens is problematic and needs to be repaired or subsequently processed.
The quality inspection method of the laser direct imaging lens of the embodiment specifically comprises the following steps:
s1: detecting the imaging sharpness of the imaging lens: calculating the imaging sharpness, acquiring the maximum value in the imaging sharpness, comparing the maximum value of the imaging sharpness with the imaging sharpness index value, if the maximum value of the imaging sharpness is smaller than the imaging sharpness index value, determining that the imaging sharpness of the imaging lens cannot meet the requirement, otherwise, determining that the imaging sharpness is qualified; the specific method comprises the following steps:
s11: setting the increment direction of the X axis to be consistent with the increment of the distance from the camera imaging surface to the image side objective lens;
s12: moving Y, Z the axis so that the camera imaging plane center substantially coincides with the lens center;
s13: moving the X axis to ensure the distance f between the imaging plane of the camera and the objective lens at the image side1-C (from near to far) or f1+ C (from far to near); wherein C represents the step size of the movement, which can be within the range (2 d)1＜C＜10d1) May take any value of d1Representing the image-side depth of focus, where the image is taken, calculating the imaging sharpness, recording the X-coordinate and the imaging sharpness as X0,k0；
S14: moving the X axis to Xi＝0x + i (Δ x 1i, ═ 2, (. n. near, to) far) or xi＝x0I · Δ X (i ═ 1, 2.., n) (from far to near), where the images were taken, the imaging sharpness was calculated, and the X coordinate and imaging sharpness at this time were recorded as Xi,kiWherein the moving step length is 0 < delta x < d1/2，d1Designed for the image focal depth, n is calculated in a manner of [ 2C/delta x ]](rounding), wherein n represents a sequentially recorded number, and C satisfies 2d1＜C＜10d1；
S15: repeating procedure 5 to obtain (k)0,k1,....,ki,...,kn)；
S16: obtaining imaging sharpness (k)0,k1,....,ki,...,kn) Maximum value of (1), i.e. MAXK ═ max (k)0,k1,....,ki,...,kn) The MAXK is the optimal imaging sharpness of the imaging lens;
the MAXK and the imaging sharpness index value K are comparedstdComparing if MAXK is less than KstdWhen the imaging sharpness of the imaging lens cannot meet the requirement, KstdThe minimum imaging sharpness index of the lens is required to meet the quality requirement. Otherwise, the product is qualified.
S2: detection of pattern generator mounting position: finding the H-axis coordinate corresponding to the maximum imaging sharpness value through the calculated imaging sharpness, wherein the H-axis coordinate is the position of the optimal pattern generator;
the assembling position of the pattern generator along the optical axis directly affects the imaging sharpness and curvature of field of the imaging lens, so that the optimal assembling position of the pattern generator of the imaging lens needs to be detected in the assembling process, and the method specifically comprises the following steps:
s21: the H axis is shifted so that the pattern generator is spaced from the objective lens by a distance f2The H-axis coordinate at this time is HfWherein f is2A design distance for an object focus of the imaging lens;
s22: by the imaging sharpness detection method of step S1, the clearest position of the lens is found, keeping X, Y, Z still. The H-axis coordinate at this time is Hf；
S23: moving the H axis to H0＝Hf+ E (from far to near) or H0＝Hf-E (proximal and distal); wherein E represents a moving step and satisfiesAnd E < f2，f2Design distance, d, representing the object focal length of the imaging lens2Representing the object space design focal depth, at which time the industrial camera captures the image and calculates the imaging sharpness, recording the H-axis coordinate and the imaging sharpness as H0,K0；
S24: moving the H axis to Hi＝H0-i · Δ H (i ═ 1, 2.., n) (from far to near) or Hi＝H0+ i · Δ h (i ═ 1, 2.., n) (from near to far), where,d2designing the focal depth for the object space, n ═ 2. E/delta. h](round up). At this time, the industrial camera captures an image and calculates the image side imaging sharpness. Recording the coordinates of the H axis and the sharpness of the image as Hi,Ki；
S25: step S24 is repeated to obtain (H)0,K0),(H1,K1),....,(Hn,Kn) Finding the maximum imaging sharpness KiThe corresponding H-axis coordinate is HiH of the reaction systemiIs the optimal pattern generator position.
S3: and (3) detecting the curvature of field of the lens: finding a clear imaging position XOn the upper part、XLower part、XLeft side of、XRight side、XInIf the following conditions are met, the field curvature of the lens is qualified:
and is(i ═ up, down, left, right)
Wherein d is1And designing the focal depth for the image space, namely representing the qualification of the curvature of field of the lens.
S4: detection of distortion rate and magnification: finding the best acutance X-axis coordinate, enabling the center coordinate to fall in a camera visual field, moving Y, Z axes to a designated position, recording the coordinate value after each movement, calculating the actual distance and the actual multiplying power between each mark according to the coordinate value, comparing the actual distance and the actual multiplying power with theoretical values, and judging the lens distortion rate;
the method comprises the following specific steps:
s41: according to the imaging sharpness detection method of step S1, the X-axis coordinate at the time of the best sharpness is found, and then the X-axis coordinate is fixed without change.
S42: manual search moves Y, Z axis, marking the center (u)11,v11) Falls within the camera field of view;
s43: using a mark search algorithm such that the center mark (u)11,v11) Is in the center of the industrial camera, and the Y, Z coordinate at this time is recorded as (y)11,z11)。
S44: calculating the (u) of each mark according to the theoretical magnification of the lensij,vij) The physical and chemical coordinate positions are as follows: (y'ij,z'ij)＝((u11-uij)·d·R+y11,(v11-vij)·d·R+z11)；
Wherein: r represents the theoretical magnification of the lens and d represents the pixel size of the pattern generator.
S45: respectively according to the calculated coordinates (y'ij,z'ij) (i ═ 0,1,2, j ≠ 0,1,2, ij ≠ 11), and moves Y, Z to the specified positions (y'ij,z'ij) (i ═ 0,1,2, j ≠ 0,1,2, ij ≠ 11); using a mark search algorithm such that the center mark (u)ij,vij) The center of (i ═ 0,1,2, j ≠ 0,1,2, ij ≠ 11) is at the center of the industrial camera, and the Y, Z coordinate at this time is (y)ij,zij)(i＝0,1,2,j＝0,1,2,ij≠11)。
S46: and respectively calculating the actual distance and the actual multiplying power between the marks by the following formulas:
s47: calculating Δ R ═ Ri-R | (i ═ 1, 2.., 8), the difference Δ R between the theoretical magnification and the actual magnification satisfying Δ R ≦ σ1，σ1Representing the lens magnification error limit and R representing the theoretical magnification.
S48: difference Δ D ═ R between actual magnificationsi-RjI | (i ═ 1, 2., 8, j ≠ 1, 2., 8, i ≠ j), and Δ D satisfies Δ D ≦ σ2，σ2Is the distortion error limit of the lens.
The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solution of the present invention by those skilled in the art should fall within the protection scope defined by the claims of the present invention without departing from the spirit of the present invention.
Claims (6)
1. A quality inspection method of a laser direct imaging lens is characterized by comprising the following steps:
(1) detecting the imaging sharpness of the imaging lens: calculating the imaging sharpness, acquiring the maximum value in the imaging sharpness, comparing the maximum value of the imaging sharpness with the imaging sharpness index value, if the maximum value of the imaging sharpness is smaller than the imaging sharpness index value, determining that the imaging sharpness of the imaging lens cannot meet the requirement, otherwise, determining that the imaging sharpness is qualified;
(2) detection of pattern generator mounting position: finding the H-axis coordinate corresponding to the maximum imaging sharpness value through the calculated imaging sharpness, wherein the H-axis coordinate is the position of the optimal pattern generator;
(3) and (3) detecting the curvature of field of the lens: finding a clear imaging position XOn the upper part、XLower part、XLeft side of、XRight side、XInIf the following conditions are met, the field curvature of the lens is qualified:
and is(i ═ up, down, left, right)
Wherein d is1Designing depth of focus for image space, i.e. watchesShowing the qualification of the field curvature of the lens;
(4) detection of distortion rate and magnification: finding the best acutance X-axis coordinate, making the center coordinate fall in the camera visual field, moving Y, Z axes to the appointed position, recording the coordinate value after each movement, calculating the actual distance and the actual multiplying power between each mark according to the coordinate value, comparing the actual distance and the actual multiplying power with the theoretical value, and judging the lens distortion rate.
2. The method for inspecting the quality of the laser direct imaging lens according to claim 1, wherein: in the step (1), the detecting of the imaging sharpness of the imaging lens specifically includes the following steps:
(11) setting the increment direction of the X axis to be consistent with the increment of the distance from the camera imaging surface to the image side objective lens;
(12) moving Y, Z the axis so that the camera imaging plane center substantially coincides with the lens center;
(13) moving the X axis to enable the distance from the imaging surface of the camera to the image side objective lens to be any value within a specified range, obtaining a graph at the value, and recording the X coordinate and the imaging sharpness value at the moment;
(14) and finding out the maximum sharpness value in the values, namely the optimal imaging sharpness of the imaging lens.
3. The method for inspecting the quality of the laser direct imaging lens according to claim 1, wherein: in the step (2), the detection of the assembling position of the pattern generator specifically comprises the following steps:
(21) the H axis is shifted so that the pattern generator is spaced from the objective lens by a distance f2Recording the coordinate of the H axis at the moment as HfWherein f is2A design distance representing an object focal length of the imaging lens;
(22) finding the clearest position of a lens, keeping X, Y, Z axes still, moving an H axis, simultaneously capturing images through an industrial camera, calculating imaging sharpness, and recording H axis coordinates and the imaging sharpness;
(23) repeating step (22) to find the maximum imaging sharpness KiAnd the corresponding H-axis coordinate is HiIs the optimal pattern generator position.
4. The method for inspecting the quality of the laser direct imaging lens according to claim 1, wherein: in the step (4), the detection of the distortion rate and the magnification specifically comprises the following steps:
(41) finding an X-axis coordinate when the sharpness is optimal, and then fixing the X-axis coordinate to be unchanged;
(42) moving Y, Z axis to make the center mark fall in the field of view of the industrial camera, and the center mark is at the center of the camera and records the coordinate value of current Y, Z;
(43) calculating the physical and chemical coordinate position of each central mark according to the theoretical magnification of the lens;
(44) respectively moving Y, Z axes to designated positions according to the coordinate values obtained in the step (42), enabling the center of the center coordinate to be located at the center of the industrial camera, and recording the Y, Z coordinate at the moment;
(45) and (5) calculating the actual distance and the actual magnification between the marks according to the coordinate values recorded in the step (42) and the step (43).
5. The quality inspection device for the laser direct imaging lens is characterized in that: the X-axis moving device moves along the X-axis direction of the base, the Y-axis moving device moves along the Y-axis direction of the base, the Z-axis moving device moves along the Z-axis direction of the base, and the H-axis moving device moves along the H-axis of the base.
6. The device for inspecting the quality of a laser direct imaging lens according to claim 5, wherein: the X-axis moving device and the H-axis moving device are connected with the guide rail in a sliding mode, the Y-axis moving device is arranged on the X-axis moving device in a sliding mode, and the Z-axis moving device is arranged on the side face of the Y-axis moving device and corresponds to the H-axis moving device.
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| CN107607298A (en) * | 2017-09-27 | 2018-01-19 | 马彪 | The performance measurement method and its detection device of a kind of optical lens |
| CN109186959A (en) * | 2018-09-28 | 2019-01-11 | 歌尔股份有限公司 | Detection method, device and the equipment of the curvature of field of VR optics module |
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