CN111220362B - Test method and test system - Google Patents
Test method and test system Download PDFInfo
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- CN111220362B CN111220362B CN202010060640.7A CN202010060640A CN111220362B CN 111220362 B CN111220362 B CN 111220362B CN 202010060640 A CN202010060640 A CN 202010060640A CN 111220362 B CN111220362 B CN 111220362B
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- G—PHYSICS
- G01—MEASURING; TESTING
- 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
- G01M11/02—Testing optical properties
- G01M11/0207—Details of measuring devices
- G01M11/0214—Details of devices holding the object to be tested
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- G—PHYSICS
- G01—MEASURING; TESTING
- 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
- G01M11/02—Testing optical properties
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- G—PHYSICS
- G01—MEASURING; TESTING
- 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
- G01M11/02—Testing optical properties
- G01M11/0221—Testing optical properties by determining the optical axis or position of lenses
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- G—PHYSICS
- G01—MEASURING; TESTING
- 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
- G01M11/02—Testing optical properties
- G01M11/0242—Testing optical properties by measuring geometrical properties or aberrations
- G01M11/0257—Testing optical properties by measuring geometrical properties or aberrations by analyzing the image formed by the object to be tested
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Abstract
The application discloses a test method and a test system. The test method of the embodiment of the application comprises the following steps: controlling the distance between the focusing lens group and the comparison lens group to be at an upper limit value, and detecting the imaging definition of the lens to obtain a first imaging definition; controlling the distance between the focusing lens group and the comparison lens group to be at a lower limit value, and detecting the imaging definition of the lens to obtain a second imaging definition; and when the first imaging definition and the second imaging definition are both greater than the preset imaging definition, determining that the quality of the lens meets the standard. According to the testing method and the testing system, the imaging definition of the lens with the distance between the focusing lens group and the comparison lens group in the upper limit value state and the lower limit value state is detected, so that the lowest imaging definition of the lens is found, whether the quality of the lens reaches the standard is judged according to the imaging definition, the testing process is fast and convenient, and the testing result is accurate.
Description
Technical Field
The present disclosure relates to the field of lens inspection technologies, and in particular, to a test method and a test system.
Background
The performance of the lens during the common cooperation work among a plurality of groups of lenses is often required to be detected in the lens detection, the plurality of groups of lenses are often put into a fixed mechanical structure according to the design position in the industry, and the definition of the lens is detected through a detection device in the integral moving process of the fixed mechanical structure so as to judge whether the imaging quality of the lens meets the requirements. The operation difference between the lens detected by the detection mode in the detection process and the operation in the actual working process is larger, and the obtained judgment error about the imaging quality of the lens is also larger. If the operation of the lens in the actual working process is to be completely simulated to detect the multiple groups of lenses, a complex mechanical structure is required to accurately control the positions of the lenses, and higher cost and more complex flow are required.
Disclosure of Invention
The embodiment of the application provides a test method and a test system.
The testing method is used for testing the lens. The lens comprises a plurality of measured lens groups, and the measured lens groups comprise a focusing lens group and a contrast lens group. The test method comprises the following steps: controlling the distance between the focusing lens group and the comparison lens group to be at an upper limit value, and detecting the imaging definition of the lens to obtain a first imaging definition; controlling the distance between the focusing lens group and the comparison lens group to be at a lower limit value, and detecting the imaging definition of the lens to obtain a second imaging definition; and when the first imaging definition and the second imaging definition are both greater than a preset imaging definition, determining that the quality of the lens is up to standard.
The test system of the embodiment of the application is used for testing the lens. The test system comprises a fixing device, a definition detection device and a processor. The lens comprises a plurality of measured lens groups, and the measured lens groups comprise a focusing lens group and a contrast lens group. The definition detection device is used for detecting the imaging definition of the lens to obtain a first imaging definition when the fixing device controls the distance between the focusing lens group and the comparison lens group to be at an upper limit value. The definition detection device is further used for detecting the imaging definition of the lens to obtain a second imaging definition when the fixing device controls the distance between the focusing lens group and the comparison lens group to be at a lower limit value. The processor is configured to determine that the quality of the lens is up to standard when the first imaging sharpness and the second imaging sharpness are both greater than a preset imaging sharpness.
According to the testing method and the testing system, the distance between the focusing lens group and the comparison lens group is controlled to be in the upper limit value and the lower limit value, and then the imaging definition of the lens with the distance between the focusing lens group and the comparison lens group in the upper limit value state and the lower limit value state is detected, so that the first imaging definition and the second imaging definition are obtained. Because the first imaging definition corresponding to the upper limit value state and the second imaging definition corresponding to the lower limit value state of the lens reflect the corresponding imaging definitions of the lens in two extreme states, namely represent the lowest imaging definition of the lens, the test system and the test method can judge whether the lens reaches the standard according to whether the first imaging definition and the second imaging definition are both greater than the preset imaging definition. According to the testing method and the testing system, the lowest imaging definition of the lens can be found out without collecting imaging definitions of the lens in all focusing states in the testing process, and whether the quality of the lens reaches the standard or not is judged according to the lowest imaging definition of the lens, so that the testing process is fast and convenient, and the testing result is accurate.
Additional aspects and advantages of embodiments of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present application.
Drawings
The above and/or additional aspects and advantages of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic flow chart of a test method according to certain embodiments of the present application;
FIG. 2 is a schematic block diagram of a test system according to some embodiments of the present application;
FIG. 3 is a schematic block diagram of a test system according to some embodiments of the present application;
FIG. 4 is a schematic diagram of sharpness changes of a lens according to some embodiments of the present application;
FIG. 5 is a schematic illustration of the construction of a periscopic fixation device according to certain embodiments of the present application;
FIG. 6 is a schematic flow chart of a test method according to certain embodiments of the present application;
FIG. 7 is a comparative schematic illustration of a first fixation device and a second fixation device according to certain embodiments of the present application;
FIG. 8 is a schematic flow chart of a test method according to certain embodiments of the present application;
FIG. 9 is a schematic flow chart of a test method according to certain embodiments of the present application;
FIG. 10a is a schematic diagram of a short focus state of a lens according to some embodiments of the present application;
FIG. 10b is a schematic diagram of a telephoto state of a lens according to some embodiments of the present application;
FIG. 11 is a schematic flow chart of a test method according to certain embodiments of the present application;
FIG. 12 is a schematic flow chart of a test method according to certain embodiments of the present application;
FIG. 13 is a schematic flow chart of a test method according to certain embodiments of the present application;
FIG. 14 is a schematic flow chart of a test method according to certain embodiments of the present application;
FIG. 15 is a schematic block diagram of a test system according to certain embodiments of the present application;
FIG. 16 is a schematic block diagram of a test system according to certain embodiments of the present application;
FIG. 17 is a schematic illustration of a comparison of a first short coke fixture, a first long coke fixture, a second short coke fixture and a second long coke fixture according to certain embodiments of the present application;
FIG. 18 is a block diagram of a test system according to some embodiments of the present application.
Detailed Description
Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative and are only for the purpose of explaining the present application and are not to be construed as limiting the present application.
Referring to fig. 1, 2 and 3, a testing method is provided in an embodiment of the present application. The testing method is used for testing the lens 100. The lens 100 includes a plurality of measured lens groups 90, and the plurality of measured lens groups 90 includes a focusing lens group 40 and a contrast lens group 50. The test method comprises the following steps:
01: controlling the distance between the focusing lens group 40 and the comparison lens group 50 to be at an upper limit value (as shown in fig. 2), and detecting the imaging definition of the lens 100 to obtain a first imaging definition;
02: controlling the distance between the focusing lens group 40 and the contrast lens group 50 to be at a lower limit value (as shown in fig. 3), and detecting the imaging definition of the lens 100 to obtain a second imaging definition; and
03: when both the first imaging sharpness and the second imaging sharpness are greater than the preset imaging sharpness, it is determined that the quality of the lens 100 is up to standard.
Referring to fig. 2, the present embodiment further provides a testing system 1000. The test system 1000 is used for testing the lens 100. The test system 1000 includes a fixture 200, a sharpness detection apparatus 300, and a processor 400. The lens 100 includes a plurality of measured lens groups 90, and the plurality of measured lens groups 90 includes a focusing lens group 40 and a contrast lens group 50. The test method according to the embodiment of the present application can be implemented by the test system 1000 according to the embodiment of the present application. For example, the sharpness detecting apparatus 300 and the fixture 200 may be configured to perform the methods of 01 and 02, and the processor 400 may be configured to perform the method of 03.
That is, the sharpness detecting apparatus 300 may be configured to detect the imaging sharpness of the lens barrel 100 to obtain the first imaging sharpness when the fixing apparatus 200 controls the distance between the focusing lens group 40 and the contrast lens group 50 to be at the upper limit value (as shown in fig. 2). The sharpness detecting apparatus 300 is further configured to perform sharpness detection on the lens barrel 100 to obtain a second sharpness of imaging when the fixing apparatus 200 controls the distance between the focusing lens group 40 and the contrast lens group 50 to be at the lower limit value (as shown in fig. 3). Processor 400 may be configured to determine that the quality of lens 100 is acceptable when both the first imaging sharpness and the second imaging sharpness are greater than the preset imaging sharpness. In some embodiments, the processor 400 may also be integrated in the sharpness detection apparatus 300.
The testing method and the testing system 1000 according to the embodiment of the application simulate the extreme state of the lens 100 when focusing by controlling the distance between the focusing lens group 40 and the contrast lens group 50 to be at the upper limit value and the lower limit value, so as to realize the accurate simulation of the actual working scene of the lens 100, and then respectively detect the imaging definition of the lens 100 when the distance between the focusing lens group 40 and the contrast lens group 50 is at the upper limit value and the lower limit value, so as to obtain the first imaging definition and the second imaging definition. Since the first imaging sharpness corresponding to the upper limit state and the second imaging sharpness corresponding to the lower limit state of the lens 100 reflect the imaging sharpness corresponding to the lens 100 in two extreme states, i.e., represent the lowest imaging sharpness of the lens 100, the test system 1000 and the test method can determine whether the lens 100 meets the standard according to whether the first imaging sharpness and the second imaging sharpness are both greater than the preset imaging sharpness. The testing method and the testing system 1000 in the embodiment of the application can find out the lowest imaging definition of the lens 100 without collecting the imaging definitions of the lens 100 in all focusing states in the testing process, and judge whether the quality of the lens 100 reaches the standard according to the lowest imaging definition of the lens 100, so that the testing process is fast and convenient, and the testing result is accurate.
In addition, the test method and the test system 1000 according to the embodiment of the present application compensate for an error between a conventional detection method and an actual working scene of lens focusing by using methods of detecting the imaging sharpness of the lens 100 in the upper limit state and the lower limit state, respectively, and can ensure that a qualified lens has a good effect in actual working.
In some embodiments, the upper limit is the maximum distance separating focusing lens set 40 from reference lens set 50 during focusing along optical axis O. The lower limit is the minimum distance between the focusing lens group 40 and the reference lens group 50 during focusing along the optical axis O. The upper limit value and the lower limit value correspond to a moving limit value of the focusing lens group 40 in a focusing process moving along the optical axis O, so that it can be ensured that the lens 100 has an imaging definition meeting the standard in the process of moving the focusing lens group 40 along the optical axis O if the quality of the lens 100 is meeting the standard.
Referring to fig. 4, the relationship between the sharpness of the image of the lens 100 and the distance d between the focusing lens set 40 and the contrast lens set 50 is shown. The distance between the focusing lens group 40 and the reference lens group 50 is an optimum value dOptimization ofWhen the image is captured, the lens 100 has the best imaging definition; the distance between the focusing lens group 40 and the reference lens group 50 is a design standard value dStandard of meritThe lens 100 has imaging sharpness that is not necessarily optimal, but better; the distance between the focusing lens group 40 and the reference lens group 50 is set to an upper limit value dUpper limit ofAnd a lower limit value dLower limit ofWhen the lenses 100 have poor image clarity. Due to [ dLower limit of,dOptimization of]In the process, the tendency of the imaging sharpness of the lens 100 is monotonously increasing, [ dOptimization of,dUpper limit of]In the process, the tendency of the imaging sharpness of the lens 100 is monotonically decreasing. Therefore, if the distance between the focusing lens group 40 and the reference lens group 50 is the upper limit dUpper limit ofThe quality of the lens 100 is up to standard, and the distance between the focusing lens group 40 and the contrast lens group 50 is the lower limit dLower limit ofWhen the quality of the lens 100 is up to the standard, it is stated as [ d ]Upper limit of,dLower limit of]The quality of the lens 100 must be up to standard during the process. Thus, the test method and the test system 1000 according to the embodiment of the present application determine that the quality of the lens 100 is up to standard when both the first imaging sharpness and the second imaging sharpness are greater than the preset imaging sharpness.
In another embodiment, the upper limit value is a median value of a standard design value and a maximum distance between the focusing lens group 40 and the reference lens group 50 during focusing when moving along the optical axis O. The lower limit value is a minimum distance between the focusing lens group 40 and the reference lens group 50 during focusing along the optical axis O and a median value of the standard design value. At this time, since the upper limit value is closer to the standard design value than the maximum distance between the focusing lens group 40 and the reference lens group 50, the lower limit value is closer to the standard design value than the minimum distance between the focusing lens group 40 and the reference lens group 50, and the distance finally determined between the focusing lens group 40 and the reference lens group 50 during the actual focusing operation is generally the optimal distance d that maximizes the lens resolutionOptimization ofAnd d isOptimization ofGeneral and standard design values dStandard of meritTherefore, the detection method and the detection system 1000 can more approximately simulate the distance interval determined finally between the focusing lens group 40 and the contrast lens group 50 in the actual focusing process, and can find out the lowest imaging definition of the lens 100 without collecting the imaging definitions of the lens 100 in all focusing states, and determine whether the quality of the lens 100 reaches the standard according to the lowest imaging definition of the lens 100, so that the testing process is fast and convenient and the testing result is accurate.
In some embodiments, the difference between the upper limit value and the standard design value may be equal to the difference between the lower limit value and the standard design value. In other embodiments, the difference between the upper limit value and the standard design value may be greater than the difference between the lower limit value and the standard design value. In other embodiments, the difference between the upper limit value and the standard design value may be less than the difference between the lower limit value and the standard design value.
In the embodiments of the present application, the distance between the focusing lens group 40 and the reference lens group 50 may be a distance between lens vertices of adjacent and opposite surfaces of the focusing lens group 40 and the reference lens group 50, a distance between a center point of the focusing lens group 40 and a center point of the reference lens group 50, or a distance between a center point of the focusing lens group 40 and a center point of one lens group (e.g., the second lens group 20) of the reference lens group 50 closest to the focusing lens group 40.
Referring to FIG. 2, in some embodiments, a contrast lens set 50 includes a first lens group 10 and a second lens group 20, and a focusing lens set 40 includes a third lens group 30. The first lens group 10, the second lens group 20, and the third lens group 30 are disposed in this order in the optical axis O direction. At this time, the second lens group 20 and the third lens group 30 may be moved together in a direction approaching the first lens group 10 to change the lens 100 from the short focus state to the long focus state, and may be moved together in a direction away from the first lens group 10 to change the lens 100 from the long focus state to the short focus state. The process of moving the second lens group 20 and the third lens group 30 together is a zooming process. After zooming, the third lens group 30 moves slightly relative to the reference lens group 50 (i.e. the first lens group and the second lens group) to complete focusing.
Alternatively, in other embodiments, focusing lens group 40 includes first lens group 10, contrast lens group 50 includes second lens group 20 and third lens group 30, and first lens group 10, second lens group 20 and third lens group 30 are disposed in order along optical axis O. At this time, the second lens group 20 and the first lens group 10 may be moved together in a direction approaching the third lens group 30 to change the lens 100 from the short focus state to the long focus state, and may be moved together in a direction separating from the third lens group 30 to change the lens 100 from the long focus state to the short focus state. The process of moving the second lens group 20 and the first lens group 10 together is a zooming process. After zooming, the first lens group 10 moves slightly relative to the reference lens group 50 (i.e. the second lens group 20 and the third lens group 30) to complete focusing.
Referring to fig. 5, in some embodiments, the lens 100 further includes a reflecting prism 80. The reflection prism 80 may be disposed on the object side of the measured lens group 90, so that the incident light is bent by 90 degrees and then enters the measured lens group 90. The fixture 200 includes a periscopic fixture 230. In the test method or the test system 1000, the reflection prism 80 and the tested lens group 90 can be placed together in the periscope fixture 230, and then the definition of the lens 100 is detected. At this time, the periscopic fixing device 230 includes 4 mechanical cylinders, such as 4 mechanical cylinders from top to bottom in fig. 5, including a first mechanical cylinder, a second mechanical cylinder, a third mechanical cylinder and a fourth mechanical cylinder. Wherein the first mechanical cylinder at the bottom is used to fix the reflection prism 80, the next second mechanical cylinder is used to fix the first lens group 10, the third mechanical cylinder is used to fix the second lens group 20, and the fourth mechanical cylinder at the top is used to fix the third lens group 30. The first mechanical cylinder at the bottom is used to hold the reflecting prism 80 so that the test method or test system 1000 can be used to test the lens 100 with periscopic functionality.
In this embodiment of the present application, the testing method and the testing system 1000 determine that the quality of the lens 100 is up to standard when both the first imaging sharpness and the second imaging sharpness are greater than the preset imaging sharpness. In some embodiments, the testing method and testing system 1000 determines that the quality of the lens 100 is unsatisfactory when one of the first imaging sharpness and the second imaging sharpness is less than a preset imaging sharpness.
In further embodiments, the testing method and testing system 1000 determines that the quality of the lens 100 is satisfactory when one of the first imaging sharpness and the second imaging sharpness is less than a preset imaging sharpness. In certain embodiments, the testing method and testing system 1000 determines that the quality of the lens 100 is unsatisfactory when both the first imaging sharpness and the second imaging sharpness are less than a preset imaging sharpness.
The test method and the test system 1000 may treat the case where the first imaging resolution or the second imaging resolution is equal to the preset imaging resolution as being smaller than the preset imaging resolution, or treat the case where the first imaging resolution or the second imaging resolution is equal to the preset imaging resolution as being greater than the preset imaging resolution.
Referring to fig. 2 and 6, in some embodiments, a plurality of lens groups 90 are disposed along the optical axis O. 01 and 02, the imaging definition detection is performed on the lens 100, and comprises the following steps:
011: controlling the plurality of lens groups 90 to move integrally along the optical axis O direction;
012: continuously detecting the MTF value of the lens 100; and
013: the maximum value of the MTF values of the lens 100 during the movement is taken as the imaging sharpness.
Referring to fig. 2, in some embodiments, a plurality of lens groups 90 are disposed along the optical axis O, and the testing system 1000 further includes a driving component 500. The sharpness detection apparatus 300 and the drive component 500 can be used to perform the method in 011, and the sharpness detection apparatus 300 can be used to perform the methods in 012 and 013.
That is, the sharpness detecting apparatus 300 can be configured to control the driving component 500 to drive the plurality of lens groups 90 to move in the optical axis O direction as a whole, continuously detect the MTF value of the lens 100, and take the maximum value of the MTF values of the lens 100 during the movement as the imaging sharpness.
Specifically, the sharpness detecting apparatus 300 may include a light source 301, a discrimination plate 302, a photosensitive element 303, and a processing unit 304. The light emitted from the light source 301 passes through the resolution board 302, the plurality of measured lens groups 90 (herein, equal to the lens 100, hereinafter, replaced with the lens 100), and then is collected by the photosensitive element 303 to form a test image. 012. The method of 013 can be implemented by the processing unit 304. That is, the processing unit 304 is configured to: continuously detecting the MTF value of the lens 100; the maximum value of the MTF values of the lens 100 during the movement is taken as the imaging sharpness. In some embodiments, when the processor 400 is integrated in the sharpness detecting apparatus 300, the processor 400 may be the processing unit 304.
Referring to fig. 2, light emitted from a light source 301 passes through a resolution plate 302 and a lens 100 and is collected by a photosensitive element 303 to form a test image. The testing method and system 1000 first place the lens 100 (including the focusing lens group 40, the comparison lens group 50 and other lens groups to be tested) on the fixing device 200, and at this time, the fixing device 200 controls the distance between the focusing lens group 40 and the comparison lens group 50 to be at the upper limit value or the lower limit value. The light source 301 under the lens illuminates the test resolution board 302, and after passing through the lens 100, the light is collected by the photosensitive element 303 to form a test image. The test image is transmitted from the light sensing unit 303 to the processing unit 304 (the processing unit 304 may comprise, for example, computer-specific software). After analyzing the light intensity distribution, the processing unit 304 calculates an MTF value of the lens 100 through fourier transform.
Referring to fig. 2, in some embodiments, the sharpness detecting apparatus 300 further includes a high power objective lens 305. The high power objective 305 is disposed above the fixing device 200, and light emitted from the light source 301 passes through the resolution plate 302, the lens 100, and the high power objective 305 in sequence and is collected by the photosensitive element 303 to form a test image. The test image is transmitted from the light sensing unit 303 to the processing unit 304 (the processing unit 304 may comprise, for example, computer-specific software). After analyzing the light intensity distribution, the processing unit 304 calculates an MTF value of the lens 100 through fourier transform.
The resolution board 302 used in the MTF test has various light and dark stripes with different resolutions distributed in different directions as line marks, and the line marks are projected through the lens 100, and the result of the measurement is the restoration of the sharpness of the image. If the sharpness of the obtained image is exactly the same as that of the resolution plate 302, the MTF value of the lens 100 is 100%, which is a lens having the best image sharpness in an ideal case, and does not exist in reality. If the sharpness is half of the resolution plate 302, the MTF value is 50%. An MTF value of 0 represents a complete loss of sharpness and the black and white lines are reduced to a single gray color. The predetermined MTF value may be 60%, that is, when the MTF value exceeds 60% (under 20 lp/mm), the imaging sharpness of the lens 100 is up to standard. Generally, an MTF value exceeding 80% indicates that the imaging sharpness of the lens 100 is already excellent. And MTF values below 60% indicate that the quality of the lens 100 is not satisfactory. Generally, an MTF value lower than 30% indicates that the imaging sharpness of the lens 100 is very poor. It should be noted that the testing of the MTF value can accurately obtain the imaging sharpness of the lens, and in other embodiments of the present application, other methods may also be used to test the imaging sharpness of the lens.
The driving member 500 and the fixing device 200 can cooperate to control the movement of the plurality of lens groups 90 to be tested along the optical axis O. Specifically, the driving component 500 may be disposed at the bottom of the fixing device 200, and a motor (not shown) is disposed inside the driving component and can move up and down to drive the fixing device 200 to move up and down, so that the plurality of lens groups 90 to be tested can move integrally along the optical axis O direction, thereby facilitating the sharpness detecting device 300 to continuously detect the MTF value of the lens 100, and finally the processing unit 304 in the sharpness detecting device 300 takes the maximum value of the MTF values of the lens 100 during moving as the imaging sharpness.
In other embodiments, such as when the lens 100 includes the prism 80, the driving member 500 may also be disposed on the light incident side of the fixture 200.
Referring to fig. 7, 8 and 9, in some embodiments, controlling the distance between the focusing lens set 40 and the contrast lens set 50 to be at the upper limit value in 01 includes:
014: placing a plurality of measured lens groups 90 on the first fixing device 210 so that the distance between the focusing lens group 40 and the contrast lens group 50 is at an upper limit value;
02, controlling the distance between the focusing lens group 40 and the reference lens group 50 to be at the lower limit value includes:
024: the plurality of measured lens groups 90 are placed on the second fixing device 220, so that the distance between the focusing lens group 40 and the reference lens group 50 is at the lower limit.
Referring to fig. 7, in some embodiments, the fastening device 200 includes a first fastening device 210 and a second fastening device 220. Test system 1000 may be used to perform the methods in 014 and 024.
That is, the first fixing device 210 can be used to fix the plurality of measured lens groups 90, so that the distance between the focusing lens group 40 and the reference lens group 50 is at the upper limit. The second fixing device 220 can be used to fix the plurality of measured lens groups 90, so that the distance between the focusing lens group 40 and the reference lens group 50 is at a lower limit.
Referring to fig. 2, 3 and 7, in some embodiments, the fixture 200 has 3 mechanical cylinders. The mechanical cylinder is used to fix the tested lens group 90. Specifically, 3 mechanical cylinders are respectively used for fixing the focusing lens group 40, the contrast lens group 50 and the other measured lens groups 90, and the specific corresponding relationship is determined according to actual needs, which is not limited in the present application. Taking 3 measured lens groups 90 in total as an example, the first lens group 10, the second lens group 20, and the third lens group 30 are respectively described below. Wherein, the first lens group 10 and the second lens group 20 form a contrast lens group 50, and the third lens group 30 is a focusing lens group 40; alternatively, the second lens group 20 and the third lens group 30 form a contrast lens group 50, and the first lens group 100 is a focusing lens group 40. In the present embodiment, the first lens group 10 and the second lens group 20 form the reference lens group 50, and the third lens group 30 is the focusing lens group 40, for example, in the working process of the lens assembly 100, the first lens group 10 is fixed, the second lens group 20 and the third lens group 30 move together along the optical axis O to change the focal length (i.e. zooming) of the lens assembly 100, and finally the third lens group 30 slightly moves along the optical axis O relative to the first lens group 10 and the second lens group 20 to focus. In this case, of the 3 mechanical barrels, the third mechanical barrel closest to the sharpness detecting device 300 may be used to fix the third lens group 30; the first mechanical cylinder closest to the driving part 500 may be used to fix the first lens group 10, and the middle second mechanical cylinder may be used to fix the second lens group 20. The bottom plate of the mechanical cylinder can be provided with a structure for fixing the tested lens group 90, such as a clamp, a tray or a buckle. The fastening device 200 includes a first fastening device 210 and a second fastening device 220. The barrel height of the second mechanical barrel in the first fixing device 210 is an upper limit value, so that the interval between the bottom plate of the second mechanical barrel and the bottom plate of the third mechanical barrel is an upper limit value, and thus the distance between the focusing lens group 40 and the reference lens group 50 is fixed to the upper limit value. The barrel height of the second mechanical barrel in the second fixing device 220 is a lower limit value, so that the interval between the bottom plate of the second mechanical barrel and the bottom plate of the third mechanical barrel is a lower limit value, and thus the distance between the focusing lens group 40 and the reference lens group 50 is fixed to the lower limit value.
Referring to fig. 10a, 10b and 11 to 14, in some embodiments, when the lens 100 is in operation, at least one lens group 90 to be measured can move along the optical axis O direction so that the lens 100 has a short-focus state shown in fig. 10a and a long-focus state shown in fig. 10 b. The first fixture 210 includes a first short focus fixture 211 and a first long focus fixture 212. The second fixing device 220 includes a second short focus fixing device 221 and a second long focus fixing device 222. Placing the plurality of measured lens groups 90 on the first fixture 210 so that the distance between the focusing lens group 40 and the reference lens group 50 is at the upper limit (i.e. 014) includes:
0141: placing the plurality of measured lens groups 90 on the first short-focus fixing device 211, so that the distance between the focusing lens group 40 and the contrast lens group 50 is at the upper limit value in the short-focus state; and/or
0142: placing the plurality of measured lens groups 90 on the first telephoto fixing device 212 so that the distance between the focusing lens group 40 and the contrast lens group 50 is at the upper limit value in the telephoto state;
placing plurality of measured lens groups 90 on second fixture 220 such that the distance between focusing lens group 40 and reference lens group 50 is at a lower limit (i.e., 024) comprises:
0241: placing the plurality of measured lens groups 90 on the second short-focus fixing device 221, so that the distance between the focusing lens group 40 and the contrast lens group 50 is at the lower limit value in the short-focus state; and/or
0242: the plurality of measured lens groups 90 are placed on the second telephoto fixing device 222, so that the distance between the focusing lens group 40 and the contrast lens group 50 is at the lower limit value in the telephoto state.
Referring to fig. 10a and 10b, in some embodiments, when the lens 100 is in operation, at least one of the lens groups 90 can move along the optical axis O to enable the lens 100 to have a short-focus state shown in fig. 10a and a long-focus state shown in fig. 10 b. The first fixing device 210 includes a first short focus fixing device 211 and a first long focus fixing device 212, and the second fixing device 220 includes a second short focus fixing device 221 and a second long focus fixing device 222. Test system 1000 may be used to perform the methods in 0141, 0142, 0241, and 0242.
That is, the first short focus fixing device 211 can be used to fix the plurality of measured lens groups 90 such that the distance between the focusing lens group 40 and the contrast lens group 50 is at the upper limit value in the short focus state. The first telephoto fixing device 212 may be used to fix the plurality of measured lens groups 90 such that the distance between the focusing lens group 40 and the contrast lens group 50 is at an upper limit in the telephoto state. The second short focus fixing device 221 can be used to fix the plurality of measured lens groups 90 such that the distance between the focusing lens group 40 and the contrast lens group 50 is at the lower limit value in the short focus state. The second telephoto fixing device 222 may be configured to fix the plurality of measured lens groups 90 such that the distance between the focusing lens group 40 and the contrast lens group 50 is at a lower limit in the telephoto state.
Referring to fig. 10a and 10b, when the lens 100 works, light can sequentially pass through the first lens assembly 10, the second lens assembly 20, the third lens assembly 30, and finally reach the image sensor 70 to form image information.
Referring to fig. 2, 15 and 17, in particular, the first fixing device 210 includes a first short focus fixing device 211 and a first long focus fixing device 212. In the first short focus fixing device 211, the barrel height of the first barrel is set to the upper limit value, so that the interval between the bottom plate of the first barrel and the bottom plate of the second barrel is set to the upper limit value in the short focus state, and the distance between the third lens group 30 and the reference lens group 50 is set to the upper limit value in the short focus state. In the first telephoto fixing device 212, the barrel height of the first mechanical barrel is set to the lower limit value in the telephoto state, and the interval between the bottom plate of the first mechanical barrel and the bottom plate of the second mechanical barrel is set to the lower limit value in the telephoto state, so that the distance between the third lens group 30 and the reference lens group 50 is fixed to the lower limit value. The distance between the third lens group 30 and the reference lens group 50 can be a distance between lens apexes of adjacent and opposite surfaces of the third lens group 30 and the second lens group 20, or a distance between center points of the third lens group 30 and the second lens group 20, which is not limited herein.
Referring to fig. 3, 16 and 17, the second fixing device 220 includes a second short focus fixing device 221 and a second long focus fixing device 222. In the second short focus fixing device 221, the barrel height of the first barrel is set to the upper limit value, and the interval between the bottom plate of the first barrel and the bottom plate of the second barrel is set to the upper limit value in the short focus state, so that the distance between the third lens group 30 and the reference lens group 50 is fixed to the upper limit value in the short focus state. In the second telephoto fixing device 222, the barrel height of the first mechanical barrel is set to the lower limit value in the telephoto state, and the interval between the bottom plate of the first mechanical barrel and the bottom plate of the second mechanical barrel is set to the lower limit value in the telephoto state, so that the distance between the third lens group 30 and the reference lens group 50 is fixed to the lower limit value. In the embodiment of the present application, the distance between the third lens group 30 and the reference lens group 50 may be a vertex distance of lenses of adjacent and opposite surfaces of the third lens group 30 and the second lens group 20, or a distance between center points of the third lens group 30 and the reference lens group 50, which is not limited herein.
Referring to fig. 18, in some embodiments, a plurality of fastening devices 200 can be connected to a same driving member 500 for cooperating therewith. Specifically, a plurality of fixing devices 200 may be provided on one driving part 500. A motor (not shown) is disposed in the driving component 500, and can move up and down to drive the plurality of fixing devices 200 to move up and down together, so that the plurality of lens groups 90 to be tested can move integrally along the optical axis O direction, thereby facilitating the sharpness detecting device 300 to continuously detect the MTF value of the lens 100, and finally the processing unit 304 in the sharpness detecting device 300 takes the maximum value of the MTF values of the lens 100 during the up and down movement as the imaging sharpness. And the processing unit 304 of the sharpness detecting apparatus 300 moves right to the corresponding position (directly above the fixing apparatus 200) after completing the detection of the imaging sharpness of one lens 100, and continues to detect the imaging sharpness of the next lens 100. This embodiment is advantageous for the sharpness detecting apparatus 300 to continuously and rapidly detect the lens 100, and is helpful for improving the detection efficiency.
In summary, the testing method and the testing system 1000 according to the embodiment of the present application respectively perform the imaging sharpness detection on the lens 100, in which the distance between the focusing lens group 40 and the contrast lens group 50 is controlled to be at the upper limit and the lower limit, and then the distance between the focusing lens group 40 and the contrast lens group 50 is controlled to be at the upper limit and the lower limit, so as to obtain the first imaging sharpness and the second imaging sharpness. Since the first imaging sharpness corresponding to the upper limit state and the second imaging sharpness corresponding to the lower limit state of the lens 100 reflect the imaging sharpness corresponding to the lens 100 in two extreme states, i.e., represent the lowest imaging sharpness of the lens 100, the test system 1000 and the test method can determine whether the lens 100 meets the standard according to whether the first imaging sharpness and the second imaging sharpness are both greater than the preset imaging sharpness. The testing method and the testing system 1000 in the embodiment of the application can find out the lowest imaging definition of the lens 100 without collecting the imaging definitions of the lens 100 in all focusing states in the testing process, and judge whether the quality of the lens 100 reaches the standard according to the lowest imaging definition of the lens, so that the testing process is fast and convenient, and the testing result is accurate.
In the description herein, reference to the description of the terms "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example" or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and the scope of the preferred embodiments of the present application includes other implementations in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present application.
Although embodiments of the present application have been shown and described above, it is to be understood that the above embodiments are exemplary and not to be construed as limiting the present application, and that changes, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present application.
Claims (8)
1. A test method is used for testing a lens, and is characterized in that the lens comprises a plurality of tested lens groups, the tested lens groups comprise a focusing lens group and a comparison lens group, the tested lens groups are arranged along the direction of an optical axis, and the test method comprises the following steps:
controlling the distance between the focusing lens group and the comparison lens group to be at an upper limit value, and detecting the imaging definition of the lens to obtain a first imaging definition;
controlling the distance between the focusing lens group and the comparison lens group to be at a lower limit value, and detecting the imaging definition of the lens to obtain a second imaging definition; and
determining that the quality of the lens is up to standard when the first imaging sharpness and the second imaging sharpness are both greater than a preset imaging sharpness;
wherein, the imaging definition detection of the lens comprises:
controlling the whole tested lens group to move along the optical axis direction;
continuously detecting the MTF value of the lens; and
and taking the maximum value of MTF values of the lens in the moving process as the imaging definition.
2. The test method according to claim 1, wherein the reference lens group comprises a first lens group and a second lens group, the focusing lens group comprises a third lens group, and the first lens group, the second lens group and the third lens group are sequentially disposed along the optical axis; or
The focusing lens group comprises a first lens group, the comparison lens group comprises a second lens group and a third lens group, and the first lens group, the second lens group and the third lens group are sequentially arranged along the direction of an optical axis.
3. The testing method as claimed in claim 1, wherein the controlling the distance between the focusing lens group and the reference lens group to be at an upper limit value comprises:
placing a plurality of measured lens groups on a first fixing device, so that the distance between the focusing lens group and the comparison lens group is at the upper limit value;
the controlling the distance between the focusing lens group and the comparison lens group to be at a lower limit value comprises:
and placing a plurality of measured lens groups on a second fixing device, so that the distance between the focusing lens group and the comparison lens group is at the lower limit value.
4. The test method according to claim 3, wherein when the lens is in operation, at least one of the lens groups to be tested can be moved in the optical axis direction to make the lens have a short focus state and a long focus state, the first fixing device comprises a first short focus fixing device and a first long focus fixing device, and the second fixing device comprises a second short focus fixing device and a second long focus fixing device; the step of placing the plurality of measured lens groups on a first fixing device so that the distance between the focusing lens group and the contrast lens group is at the upper limit value comprises:
placing a plurality of measured lens groups on the first short-focus fixing device, so that the distance between the focusing lens group and the contrast lens group is at the upper limit value in the short-focus state; and/or
Placing a plurality of measured lens groups on the first telephoto fixing device, so that the distance between the focusing lens group and the contrast lens group is at the upper limit value in the telephoto state;
the placing the plurality of measured lens groups on the second fixing device so that the distance between the focusing lens group and the contrast lens group is at the lower limit value comprises:
placing a plurality of measured lens groups on the second short-focus fixing device, so that the distance between the focusing lens group and the contrast lens group is at the lower limit value in the short-focus state; and/or
And placing a plurality of measured lens groups on the second telephoto fixing device, so that the distance between the focusing lens group and the contrast lens group is at the lower limit value in the telephoto state.
5. A test system is used for testing a lens and is characterized in that the test system comprises a fixing device, a definition detection device and a processor, the lens comprises a plurality of tested lens groups, the plurality of tested lens groups comprise a focusing lens group and a comparison lens group, and the plurality of tested lens groups are arranged along the direction of an optical axis;
the definition detection device is used for detecting the imaging definition of the lens to obtain a first imaging definition when the fixing device controls the distance between the focusing lens group and the comparison lens group to be at an upper limit value;
the definition detection device is also used for detecting the imaging definition of the lens to obtain a second imaging definition when the fixing device controls the distance between the focusing lens group and the comparison lens group to be at a lower limit value;
the processor is configured to determine that the quality of the lens is up to standard when the first imaging sharpness and the second imaging sharpness are both greater than a preset imaging sharpness;
the test system further comprises a driving component, and the definition detection device is further used for:
controlling the driving part to drive the whole of the plurality of lens groups to be tested to move along the direction of the optical axis;
continuously detecting the MTF value of the lens; and
and taking the maximum value of MTF values of the lens in the moving process as the imaging definition.
6. The test system of claim 5, wherein the reference lens group comprises a first lens group and a second lens group, the focusing lens group comprises a third lens group, and the first lens group, the second lens group and the third lens group are sequentially disposed along the optical axis; or
The focusing lens group comprises a first lens group, the comparison lens group comprises a second lens group and a third lens group, and the first lens group, the second lens group and the third lens group are sequentially arranged along the direction of an optical axis.
7. The test system of claim 5, wherein the fixture includes a first fixture and a second fixture,
the first fixing device is used for fixing a plurality of measured lens groups, so that the distance between the focusing lens group and the comparison lens group is at the upper limit value;
the second fixing device is used for fixing the plurality of measured lens groups, so that the distance between the focusing lens group and the comparison lens group is at the lower limit value.
8. The test system of claim 7, wherein when the lens is in operation, at least one of the lens groups to be tested can move along the optical axis direction to enable the lens to have a short-focus state and a long-focus state, the first fixing device comprises a first short-focus fixing device and a first long-focus fixing device, and the second fixing device comprises a second short-focus fixing device and a second long-focus fixing device;
the first short-focus fixing device is used for fixing a plurality of measured lens groups so that the distance between the focusing lens group and the comparison lens group is at the upper limit value in the short-focus state; and/or
The first telephoto fixing device is configured to fix a plurality of measured lens groups, so that a distance between the focusing lens group and the contrast lens group is at the upper limit value in the telephoto state;
the second short-focus fixing device is used for fixing a plurality of measured lens groups so that the distance between the focusing lens group and the comparison lens group is at the lower limit value in the short-focus state; and/or
The second telephoto fixing device is configured to fix the plurality of measured lens groups, so that a distance between the focusing lens group and the contrast lens group is the lower limit in the telephoto state.
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| CN103118270B (en) * | 2013-02-22 | 2015-07-22 | 广东欧珀移动通信有限公司 | Camera testing device and camera testing method |
| CN105371885B (en) * | 2015-10-14 | 2018-02-13 | 凌云光技术集团有限责任公司 | A kind of automatic test approach and system of imager chip mtf value |
| CN106101561B (en) * | 2016-08-09 | 2019-06-04 | 青岛海信移动通信技术股份有限公司 | Camera focusing detection method and device |
| CN109348129B (en) * | 2018-11-13 | 2020-11-03 | 信利光电股份有限公司 | Definition detection method and system for fixed-focus camera |
| CN110057554B (en) * | 2019-05-23 | 2024-02-02 | 福州锐景达光电科技有限公司 | MTF detection device and method for imaging quality of zoom lens |
| CN110430426A (en) * | 2019-09-06 | 2019-11-08 | 昆山丘钛微电子科技有限公司 | The test method and device of phase-detection auto-focusing performance |
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| CN107421722A (en) * | 2017-07-01 | 2017-12-01 | 南京理工大学 | Based on CCD camera image intensifier modulation transfer function test method and system |
| CN110365969A (en) * | 2019-07-03 | 2019-10-22 | 惠州市德赛西威汽车电子股份有限公司 | A kind of camera adjusting process |
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