CN105025290A - Method for automatically adjusting inclination between image photographing module group sensor and lens - Google Patents
Method for automatically adjusting inclination between image photographing module group sensor and lens Download PDFInfo
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Abstract
The invention provides a method for automatically adjusting inclination between an image photographing module group sensor and a lens. The method comprises the following steps that test light is provided via a light source and a scalar board; a positioning platform drives the lens to move relative to the sensor according to a preset step; an image acquisition system acquires and transmits MTF data of test light of an image photographing module group; curve fitting is performed on the MTF data so that highest point distance difference of the MTF data of a designated area is obtained and thus degree of inclination between the image photographing module group sensor and the lens is calculated; and the image photographing module group is corrected via the positioning platform according to the degree of inclination. Curve fitting is performed on a high-step defocus curve to predict the calculation result of a low-step defocus curve so that efficiency of the whole test is enhanced. Besides, a six-degree-of-freedom parallel positioning platform can be used as the positioning platform so that the center of the positioning platform is ensured to be overlapped with the center of the sensor, and thus inclination between the sensor and the lens is ensured to be corrected accurately and timely.
Description
Technical field
The present invention relates to a kind of camera module of adjustment automatically to tilt the method for (tilt), particularly a kind ofly calculate gradient between camera module transducer and camera lens based on image and corrected the method adjusted.
Background technology
Along with the high speed development of mobile phone industry, the requirement of high-pixel mobile phone camera module to tilt between transducer (sensor) and camera lens (lens) (Tilt) is very strict, gradient during module group assembling between transducer and camera lens is excessive may cause monolateral picture to be stuck with paste, this directly has influence on the yield of product, and how calculating gradient fast and accurately and being corrected is when previous important research direction.
MTF (modulation transfer function) is accurate, the objective and quantitative image quality evaluation index of in optical system image quality evaluation method.In same optical system, original signals different for spatial frequency is inputted, the ratio of the modulation degree through system with the modulation degree without system, is defined as modulation transfer function.Take frequency f as abscissa, MTF is ordinate, the curve that the mtf value connecting different frequency is formed, and is called MTF curve.Gradient when MTF curve can be used for calculating module group assembling between transducer and camera lens, but traditional method based on small step out of focus curve, need the longer testing time, thus efficiency is lower.
In addition, gradient during module group assembling between transducer and camera lens characterizes by the angle of camera lens relative to center sensor usually, but, general adjustment platform, all can not ensure the center superposition of its center of circle and transducer, thus can not accurately, fast and effectively gradient is corrected.
Summary of the invention
Main purpose of the present invention is to provide a kind of method tilted between automatic adjustment camera module transducer and camera lens, wherein by carrying out curve fitting to large step out of focus curve, predicting the result of calculation of small step out of focus curve, improve the efficiency of whole test.
Another object of the present invention is to provide a kind of method tilted between automatic adjustment camera module transducer and camera lens, wherein six-freedom parallel locating platform can be used for correcting the inclination between camera module transducer and camera lens, thus solve that monolateral picture that described inclination causes sticks with paste bad, improve the quality of products.
Another object of the present invention is to provide a kind of method tilted between automatic adjustment camera module transducer and camera lens, wherein said six-freedom parallel locating platform can ensure the center superposition of its center and described transducer, thus guarantees accurately and timely to correct the inclination between described transducer and described camera lens.
Another object of the present invention is to provide a kind of method tilted between automatic adjustment camera module transducer and camera lens, wherein only need to carry out global analysis by the data of limited sampled point, and carry out curve fitting based on the distribution situation of these data, namely the gradient between described transducer and described camera lens can be calculated, thus greatly save the time, improve operational efficiency.
Another object of the present invention is to provide a kind of method tilted between automatic adjustment camera module transducer and camera lens, the mark version (chart) that wherein said method uses contains multiple test zone, thus multiple test event can be completed by a mark version, to reduce the number of times of more dehorn version, thus decrease the time required for test.
Another object of the present invention is to provide a kind of method tilted between automatic adjustment camera module transducer and camera lens, wherein said method is simple to operate, cost is low, and save time, be suitable for, in described camera module production process, completing detection and the rectification of the gradient between described transducer and described camera lens in time efficiently.
For reaching above object, the invention provides a kind of method tilted between automatic adjustment camera module transducer and camera lens, it comprises the steps:
A () provides test light by light source and mark version;
B () locating platform drives described camera lens with the relatively described sensor movement of predetermined step-length;
The MTF data of the described test light of camera module described in (c) image capturing system collect and transmit;
D (), by carrying out curve fitting to described MTF data, the apogee distance obtaining MTF data described in appointed area is poor, to calculate the gradient between described camera module transducer and camera lens; And
E (), according to described gradient, is corrected described camera module by described locating platform.
According to one embodiment of present invention, in the above-mentioned methods, the length of described step-length is at 5 ~ 25 μm.
According to one embodiment of present invention, in the above-mentioned methods, the length of described step-length is at 10 ~ 15 μm.
According to one embodiment of present invention, in the above-mentioned methods, the length of described step-length is 1/5 ~ 1/25 of the motor stroke of described camera module.
According to one embodiment of present invention, in the above-mentioned methods, described locating platform is six-freedom parallel locating platform.
According to one embodiment of present invention, in the above-mentioned methods, described mark version comprises out of focus MTF data acquisition region, evaluating data pickup area and the datum mark region for position location.
According to one embodiment of present invention, in the above-mentioned methods, in described step (d), first gaussian filtering process is carried out to described MTF data, then, from filtered extracting data maximum, centered by maximum of points, the data point of specifying number is extracted to from left to right, carry out global analysis to the data point participating in calculating, the mode adopting Gauss model and least square polynomial fit to combine carries out matching to data.
According to a further aspect of the invention, the present invention also provides a kind of method tilted between automatic adjustment camera module transducer and camera lens, and it comprises the steps:
(A) image capturing system gathers the MTF data of 5 ~ 25 effective sampling points in described camera module out of focus motion process;
(B) by carrying out curve fitting to the described MTF data of described effective sampling points, the apogee distance obtaining MTF data described in appointed area is poor, to calculate the gradient between described camera module transducer and camera lens; And
(C) according to described gradient, by locating platform, described camera module is corrected.
According to one embodiment of present invention, in the above-mentioned methods, the effective sampling points in described step (A) is 8 ~ 10.
According to one embodiment of present invention, in the above-mentioned methods, in described step (B), first gaussian filtering process is carried out to described MTF data, then, from filtered extracting data maximum, centered by maximum of points, the data point of specifying number is extracted to from left to right, carry out global analysis to the data point participating in calculating, the mode adopting Gauss model and least square polynomial fit to combine carries out matching to data.
According to one embodiment of present invention, in the above-mentioned methods, in described step (C), six-freedom parallel locating platform is used to correct described camera module.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the mark version used in the method tilted between automatic adjustment camera module transducer according to a preferred embodiment of the present invention and camera lens.
Fig. 2 is the sign schematic diagram according to the method medium dip degree tilted between the automatic adjustment camera module transducer of above preferred embodiment of the present invention and camera lens.
The MTF curve chart that Fig. 3 is out of focus step-length when being 1 μm.
Fig. 4 is according to MTF curve chart when out of focus step-length is 10 μm in the method tilted between the automatic adjustment camera module transducer of above preferred embodiment of the present invention and camera lens.
Fig. 5 is the schematic flow sheet according to the method tilted between the automatic adjustment camera module transducer of above preferred embodiment of the present invention and camera lens.
Fig. 6 is the step schematic diagram according to the method tilted between the automatic adjustment camera module transducer of above preferred embodiment of the present invention and camera lens.
Fig. 7 is the step schematic diagram according to the method tilted between the automatic adjustment camera module transducer of above preferred embodiment of the present invention and camera lens.
Embodiment
Below describe and realize the present invention for disclosing the present invention to enable those skilled in the art.Preferred embodiment in below describing only as an example, it may occur to persons skilled in the art that other apparent modification.The general principle of the present invention defined in the following description can be applied to other embodiments, deformation program, improvement project, equivalent and not deviate from the other technologies scheme of the spirit and scope of the present invention.
The schematic diagram of the method tilted between automatic adjustment camera module transducer according to a preferred embodiment of the present invention and camera lens as shown in Figures 1 to 7.In described method of the present invention, the testing equipment used comprises mark version, light source and locating platform, as six-freedom parallel locating platform.
Described mark version can adopt various traditional for testing the mark version that gradient between camera module transducer and camera lens detects.According to this preferred embodiment of the present invention, as shown in Figure 1, described mark version can comprise multiple test zone.As A in Fig. 1 represents out of focus MTF data acquisition region, B represents final evaluating data pickup area, and C represents the Mark point region of quick position position.Thus described camera module can complete multiple test event by described mark version, with in whole test process, more dehorn version as few as possible.That is, in the test process of traditional described camera module, need the test mark version that gradient between described camera module transducer and camera lens is detected, and to the test mark version that the image quality of final described camera module is evaluated, in different test processs, need to use different test mark versions.And in the present invention, the mark version gathering MTF data and final evaluation is all same mark version, like this, in whole test process, does not need more dehorn version, thus greatly save the time.
As shown in fig. 1, described mark version of the present invention roughly comprises three parts.In this preferred embodiment of the present invention, described mark version comprises four A districts, the A district being positioned at the middle part of upside namely shown in figure, be positioned at the middle part of downside A district, be positioned at the A district of the middle part in left side and be positioned at the A district of middle part on right side.Described mark version comprise five B districts, be namely positioned at the B district at the center of described mark version and be positioned at the B district of described mark version corner.As shown in fig. 1, described mark version can include multiple Mark point.
In the test process of described camera module, the Mark point in the C district of described mark version is used for quick position and calibration.Then, the described A district of described mark version, namely described out of focus MTF data acquisition region can be used for detecting the gradient between described camera module transducer and camera lens.Finally, the B district of described mark version, for evaluating the image quality of whole described camera module.
In the method for adjustment tilted between the described camera module transducer and camera lens of this preferred embodiment of the present invention, pass through curve fitting algorithm, matching is carried out to out of focus MTF curve, use data that large step out of focus curve goes out to calculate gradient between described camera module transducer and camera lens, to improve testing efficiency.
More specifically, when calculating gradient between described camera module transducer and camera lens, the difference of the apogee distance of the out of focus MTF curve of the symmetrical region by Tu1Zhong A district is needed to calculate the angle theta 1 in the plane of gradient between described camera module transducer and camera lens and θ 2, as shown in Figure 2.
Described camera module transducer is coupled to voice coil motor, the operation mainly displacement of described motor, the change of displacement is the change of focal length in the performance of camera lens, and the embodiment of the change of focal length on image is the change of image definition, so by the situation of change of MTF, indirectly can test the change in displacement situation of described motor, the change in displacement of camera lens relative to focal position is changed by the relative position changing described motor, again by calculating the mtf value of described motor operation at diverse location image, the ruuning situation of described motor just can be judged.
The schematic flow sheet of the method tilted between the automatic adjustment camera module transducer of this preferred embodiment of the present invention and camera lens as shown in Figure 5.Described motor and lens assembly is driven to walk out of focus curve by described six-freedom parallel locating platform.Motor operation runs according to the fixed step size of setting, obtains the image of place step-length and show image on computers, calculating mtf value and real-time rendering curve, to terminate all mtf values of post analysis at test stroke and to show test results.According to feature linear between described motor displacement and drive current, the MTF of described camera module and optical image are the normal distribution curves centered by focal length apart from the relation presented.According to above 2 points, can derive, use the motor class of a curve of MTF matching to be similar to a normal distribution curve.
During test, initialization test module, described motor is made to be parked in initialized step number, the mark domain that described test module photographs similarly is square, because the figure of the sensor transmissions of test module is square, described image is transferred to computer in conjunction with lens optical characteristic through graphic transmission equipment, directly can test out the gradient between auto-focus process camera lens and transducer, and the gradient of motor reflects the gradient of transducer.When test curve, draw the mtf value at square-shaped image four angles and the curve of motor one direction step-length simultaneously, four curves drawn also are normal distribution curve, find out four peak positions of four curves, the incline direction of motor is the overturning angle at angle first the peak place from last peak place.
As shown in Figures 3 and 4, be foursquare upper left corner curve respectively, upper right corner curve, lower left corner curve is, and lower right corner curve, and incline direction tilts along the lower left corner to the direction in the upper right corner.Traditional method is in order to ensure the accuracy of result of calculation, small step out of focus curve must be run, will certainly affect operational efficiency, be 120 μm with total kilometres, and 1 step running time was 100ms is example, total testing time shown in Fig. 3 required for 1 μm/step is 12s, shown in Fig. 4, the operation total testing time of 10 μm/step is 1.2s, and efficiency has had and significantly promotes, and the error of calculation of gradient is general relevant with step-length, step-length is larger, and error is larger.In order to the error brought when overcoming raising efficiency, present invention uses orthogonal polynomial and make least square curve fitting algorithm, the data that this algorithm can obtain by walking greatly out of focus simulate the peak result of small step out of focus curve, its principle first carries out gaussian filtering process to initial data, then from filtered extracting data maximum, centered by maximum of points, the data point of specifying number is extracted to from left to right, global analysis is carried out to the data point participating in calculating, according to different Data distribution8 situations, the mode adopting Gauss model and least square polynomial fit to combine carries out matching to data.
That is, as shown in Figure 6, the method tilted between automatic adjustment camera module transducer of the present invention and camera lens, comprises the steps:
A () provides test light by light source and mark version;
B () locating platform drives described camera lens with the relatively described sensor movement of predetermined step-length;
The MTF data of the described test light of camera module described in (c) image capturing system collect and transmit;
D (), by carrying out curve fitting to described MTF data, the apogee distance obtaining MTF data described in appointed area is poor, to calculate the gradient between described camera module transducer and camera lens; And
E (), according to described gradient, is corrected described camera module by described locating platform.
As shown in Figure 3, when out of focus step-length is 1 μm, the original MTF data of a-quadrant in Fig. 1, the difference obtaining upper and lower MTF curve apogee distance is 33.2 μm, and the difference of left and right MTF curve apogee distance is 33.3 μm.
As shown in Figure 4, when out of focus step-length is 10 μm, the MTF data of a-quadrant in curve Fig. 1, the difference obtaining upper and lower MTF curve apogee distance is 31.6 μm, and the difference of left and right MTF curve apogee distance is 31.7 μm.From actual algorithm test, error is within work tolerance interval, and institute is effective and feasible in this way.
After calculating described gradient, by described locating platform, the described six-freedom parallel locating platform of this preferred embodiment of the present invention, corrects gradient.Due to the angle that the gradient θ 1 that calculates and θ 2 is relative to described center sensor, due to product feature, general adjustment platform cannot ensure the center superposition of its center of circle and described transducer, and described six-freedom parallel locating platform of the present invention can meet the demand of this respect, it can arrange separately the center of circle to described center sensor, and with the angle adjustment of its whole space plane for initial point does.
In said method of the present invention, described predetermined out of focus step-length walks greatly out of focus step-length, and that is, the numerical value of out of focus step-length is larger, like this, can shorten total testing time significantly, raise the efficiency.In this preferred embodiment of the present invention, described out of focus step-length can be 5 ~ 25 μm, such as, go up 10 shown in Fig. 4 μm.As long as it will be appreciated by persons skilled in the art that and can meet test request, described out of focus step-length also can be other numerical value.
Described light source of the present invention can be back light, and its test light sent projects described mark version, for measurement MTF data.Described light-source brightness is stablized and is made the brightness uniformity of whole described light source panel, and when testing, by the image of display unit display measurement, the size of described mark version and described light source and size need adjustment, to be full of the whole image in display unit.
It is worth mentioning that, described predetermined out of focus step-length also should not be too large, but need the sampled point ensuring enough effective quantity.Such as, in said method of the present invention, 5 ~ 25 effective sampling points can be gathered, more specifically in embodiment, 8 ~ 10 effective sampling points can be gathered, then according to these effective sampling points, make and matching MTF curve, thus calculate described gradient.It will be appreciated by persons skilled in the art that according to actual requirement, the quantity of described effective sampling points also can be chosen as required.
That is, from other one side, as shown in Figure 7, the invention provides a kind of method tilted between automatic adjustment camera module transducer and camera lens, comprise the steps:
(A) image capturing system gathers the MTF data of 5 ~ 25 effective sampling points in described camera module out of focus motion process;
(B) by carrying out curve fitting to the described MTF data of described effective sampling points, the apogee distance obtaining MTF data described in appointed area is poor, to calculate the gradient between described camera module transducer and camera lens; And
(C) according to described gradient, by locating platform, described camera module is corrected.
In the above-mentioned methods, the effective sampling points in described step (A) can be 8 ~ 10.In described step (B), first gaussian filtering process is carried out to initial data, then from filtered extracting data maximum, centered by maximum of points, the data point of specifying number is extracted to from left to right, carry out global analysis to the data point participating in calculating, according to different Data distribution8 situations, the mode adopting Gauss model and least square polynomial fit to combine carries out matching to data.In described step (C), six-freedom parallel locating platform can be used precisely to correct described camera module.
Said method of the present invention, the MTF numerical value only for limited sampled point carries out computing, assesses the distribution situation of overall data, thus greatly saves the testing results time, enhance productivity from these limited sampled point.
One skilled in the art will understand that the embodiments of the invention shown in foregoing description and accompanying drawing only limit the present invention as an example and not.Object of the present invention is complete and effectively realize.Function of the present invention and structural principle are shown in an embodiment and are illustrated, do not deviating under described principle, embodiments of the present invention can have any distortion or amendment.
Claims (11)
1. the method automatically tilted between adjustment camera module transducer and camera lens, is characterized in that, comprise the steps:
A () provides test light by light source and mark version;
B () locating platform drives described camera lens with the relatively described sensor movement of predetermined step-length;
The MTF data of the described test light of camera module described in (c) image capturing system collect and transmit;
D (), by carrying out curve fitting to described MTF data, obtains MTF data apogee distance described in appointed area poor, to calculate the gradient between described camera module transducer and camera lens; And
E (), according to described gradient, is corrected described camera module by described locating platform.
2. the method automatically tilted between adjustment camera module transducer and camera lens as claimed in claim 1, it is characterized in that, the length of described step-length is at 5 ~ 25 μm.
3. the method automatically tilted between adjustment camera module transducer and camera lens as claimed in claim 2, it is characterized in that, the length of described step-length is at 10 ~ 15 μm.
4. the method automatically tilted between adjustment camera module transducer and camera lens as claimed in claim 1, it is characterized in that, the length of described step-length is 1/5 ~ 1/25 of the motor stroke of described camera module.
5. the method automatically tilted between adjustment camera module transducer and camera lens as claimed in claim 1, it is characterized in that, described locating platform is six-freedom parallel locating platform.
6. the method automatically tilted between adjustment camera module transducer and camera lens as claimed in claim 1, it is characterized in that, described mark version comprises out of focus MTF data acquisition region, evaluating data pickup area and the datum mark region for position location.
7. the method as tilted between the automatic adjustment camera module transducer as described in arbitrary in claim 1 to 6 and camera lens, it is characterized in that, in described step (d), first gaussian filtering process is carried out to described MTF data, then from filtered extracting data maximum, centered by maximum of points, the data point of specifying number is extracted to from left to right, carry out global analysis to the data point participating in calculating, the mode adopting Gauss model and least square polynomial fit to combine carries out matching to data.
8. the method automatically tilted between adjustment camera module transducer and camera lens, is characterized in that, comprise the steps:
(A) image capturing system gathers the MTF data of 5 ~ 25 effective sampling points in described camera module out of focus motion process;
(B) by carrying out curve fitting to the described MTF data of described effective sampling points, MTF data apogee distance described in appointed area is obtained poor, to calculate the gradient between described camera module transducer and camera lens; And
(C) according to described gradient, by locating platform, described camera module is corrected.
9. the method automatically tilted between adjustment camera module transducer and camera lens as claimed in claim 8, it is characterized in that, the effective sampling points in described step (A) is 8 ~ 10.
10. the method automatically tilted between adjustment camera module transducer and camera lens as claimed in claim 8, it is characterized in that, in described step (B), first gaussian filtering process is carried out to described MTF data, then, from filtered extracting data maximum, centered by maximum of points, the data point of specifying number is extracted to from left to right, carry out global analysis to the data point participating in calculating, the mode adopting Gauss model and least square polynomial fit to combine carries out matching to data.
11. methods automatically tilted between adjustment camera module transducer and camera lens as claimed in claim 8, is characterized in that, in described step (C), use six-freedom parallel locating platform to correct described camera module.
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