Adjustment test method suitable for double telecentric imaging system
By measuring the dimensional parameters of optical components with a coordinate measuring machine and comparing them with the mounting groove reference of the target object, the assembly error problem caused by burrs and flash in the dual telecentric imaging system was solved, improving the pass rate of the lens barrel and the accuracy of lens installation.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-01-22
- Publication Date
- 2026-04-14
AI Technical Summary
In dual telecentric imaging systems, the actual assembly error of the lenses is affected by processing residues such as tiny burrs and flash, which prevents the lenses from being installed smoothly and reduces the pass rate of the lens barrel. Existing technologies lack effective detection methods.
The dimensional parameters of the optical components are measured using a coordinate measuring machine. The mounting groove of the target object is used as a reference to compare the measured dimensional parameters with the reference dimensional parameters. It is determined whether burrs affect the installation of the optical components. The mounting groove is then repaired to ensure consistency.
Effectively identify whether there are processing residues such as burrs and flash on the target object, improve the pass rate of the lens barrel, and guide machining manufacturers to inspect the accuracy of lens installation position for high-precision lens barrels and dual telecentric imaging system manufacturers.
Smart Images
Figure CN121855825A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of optical imaging technology, and in particular to an assembly and testing method suitable for dual telecentric imaging systems. Background Technology
[0002] Currently, a dual telecentric imaging system refers to an optical imaging system that superimposes an object-side telecentric imaging system and an image-side telecentric imaging system. Specifically, it means that the image-side focal plane of the object-side telecentric imaging system coincides with the object-side focal plane of the image-side telecentric imaging system, with the aperture stop serving as a common aperture stop. Its function is to simultaneously eliminate imaging errors caused by both object-side and image-side focusing inaccuracies. Therefore, dual telecentric imaging systems possess characteristics such as low distortion, large depth of field, high resolution, and consistent image magnification within a certain object distance range. Consequently, they are widely used in machine vision, precision inspection, image acquisition and analysis, and other fields.
[0003] In a dual telecentric imaging system, actual lens assembly errors, such as lens eccentricity, tilt, and air gap errors between lenses, will affect various optical parameters of the system, including telecentricity, distortion, and magnification. The following method is commonly used to control the actual assembly errors of the lenses within the lens barrel: This method involves strictly controlling the machining tolerances of each optical element (each lens) and mechanical part (mainly referring to components affecting the actual assembly error of the lenses, such as the lens barrel and spacers) in the dual telecentric imaging system through dimensional chain decomposition and tolerance analysis. Subsequently, the actual assembly errors of each lens in the dual telecentric imaging system are controlled through the dimensional tolerances between the components.
[0004] However, during the application of the above methods, it was found that burrs and flashes are generated at the edge of the lens barrel and the edge of the lens slot during the lens barrel machining process. When the size of these machining residues is around 0.01mm or even smaller, it can prevent the lens from being smoothly installed into the lens slot or from fitting tightly against the corresponding edge in the lens barrel, thus affecting the actual assembly error of the lens and ultimately reducing the pass rate of the lens barrel. Because these burrs and flashes are so small that they cannot be observed with the naked eye; and conventional machining plants do not have microscopes or other optical equipment for the inspection of parts before they leave the factory; furthermore, since burrs are generally generated at the edges of mechanical parts, it is impossible to determine whether there are burrs or flashes that affect accuracy using traditional mechanical parts inspection methods such as coordinate measuring machines. Summary of the Invention
[0005] The purpose of this application is to provide an assembly and testing method suitable for dual telecentric imaging systems, which to some extent solves the technical problem in the existing technology that the machining industry lacks effective detection means to check whether the precision of mechanical parts such as lens barrels is indeed unqualified due to minor machining residues such as burrs and flash.
[0006] This application provides a method for assembly and testing of a dual telecentric imaging system, comprising the following steps: Step 100: Measure at least one dimensional parameter of the optical element as a reference dimensional parameter; Step 200: Install the optical element in the mounting groove of the target object, and then measure the optical element's dimension parameters that are the same as the reference dimension parameters, using the mounting groove of the target object as a reference, as the measured dimension parameters; Step 300: Compare the measured dimension parameters with the reference dimension parameters. If they are consistent, it is determined that the burrs in the mounting groove on the target object will not affect the installation of the optical element. If they are inconsistent, it is determined that the burrs in the mounting groove on the target object affect the installation of the optical element. At this time, the test is terminated and the mounting groove on the target object is inspected.
[0007] In the above technical solution, the mounting groove further includes a bottom wall surface and a side wall surface arranged perpendicularly, wherein the side wall surface is cylindrical and the bottom wall surface is annular; along the assembly direction of the optical element and the mounting groove, the optical element forms a first side surface and a second side surface arranged opposite to each other, wherein the first side surface mates with the bottom wall surface of the mounting groove, and the second side surface is disposed away from the bottom wall surface of the mounting groove.
[0008] In any of the above technical solutions, further, when the bottom wall surface is a first flat mating surface, and the first side surface includes a second flat mating surface adapted to the first flat mating surface, and the second flat mating surface mates with the first flat mating surface, the assembly and testing method applicable to the dual telecentric imaging system includes the following steps: In step 100, the maximum thickness of the optical element along its central axis is measured; In step 200, with the optical element mounted in the mounting groove of the target object, the maximum height difference along the central axis between the second side surface of the optical element and the bottom wall surface of the mounting groove is measured. In step 300, the maximum height difference between the second side surface of the optical element and the bottom wall of the mounting groove is compared with the maximum thickness of the optical element. If the two are consistent, it is determined that the burrs in the mounting groove on the target object will not affect the installation of the optical element. If the two are inconsistent, it is determined that the burrs in the mounting groove on the target object affect the installation of the optical element. At this time, the test is terminated and the mounting groove on the target object is inspected.
[0009] In any of the above technical solutions, further, when the bottom wall surface is a first annular spherical surface, the first side surface is a second partial spherical surface adapted to the first annular spherical surface, and the second partial spherical surface mates with the first annular spherical surface, the assembly and testing method applicable to the dual telecentric imaging system includes the following steps: In step 100, the maximum thickness of the optical element along its central axis is measured; In step 200, with the optical element mounted in the mounting groove of the target object, the maximum height difference along the central axis between the second side surface of the optical element and the extended surface of the bottom wall of the mounting groove is measured. In step 300, the maximum height difference between the second side surface of the optical element and the bottom wall of the mounting groove is compared with the maximum thickness of the optical element. If the two are consistent, it is determined that the burrs in the mounting groove on the target object will not affect the installation of the optical element. If the two are inconsistent, it is determined that the burrs in the mounting groove on the target object affect the installation of the optical element. At this time, the test is terminated and the mounting groove on the target object is inspected.
[0010] In any of the above technical solutions, further, when the bottom wall surface is a first conical mating surface, the first side surface includes a second conical mating surface adapted to the first conical mating surface, and the second conical mating surface mates with the first conical mating surface, the assembly and testing method applicable to the dual telecentric imaging system includes the following steps: Step 100: Using any radial section formed by the mating of the second conical mating surface and the first conical mating surface as a preset radial section, measure the maximum height difference along the central axis between the second side surface of the optical element and the preset radial section as a reference dimension parameter; Step 200: Install the optical element in the mounting groove of the target object, and then measure the maximum height difference along the central axis between the preset radial section and the second side surface; Step 300: Compare the measured maximum height difference with the reference dimension parameter. If they are consistent, it is determined that the burrs in the mounting groove on the target object will not affect the installation of the optical element. If they are inconsistent, it is determined that the burrs in the mounting groove on the target object affect the installation of the optical element. At this time, the test is terminated and the mounting groove on the target object is checked.
[0011] In any of the above technical solutions, further, when the bottom wall surface is an annular surface formed by rotating around the central axis of the mounting groove with a preset radius, and is a super-toroidal surface, and the first side surface is a third part of a spherical surface, and the third part of the spherical surface is tangentially fitted with the super-toroidal surface, the assembly and adjustment test method applicable to the dual telecentric imaging system includes the following steps: Step 100: Using the radial section formed by the tangency of the third part of the spherical surface and the super-toroidal surface as the preset radial section, measure the maximum height difference along the central axis between the second side surface of the optical element and the preset radial section as the reference dimension parameter; Step 200: Install the optical element in the mounting groove of the target object, and then measure the maximum height difference along the central axis between the preset radial section and the second side surface; Step 300: Compare the measured maximum height difference with the reference dimension parameter. If they are consistent, it is determined that the burrs in the mounting groove on the target object will not affect the installation of the optical element. If they are inconsistent, it is determined that the burrs in the mounting groove on the target object affect the installation of the optical element. At this time, the test is terminated and the mounting groove on the target object is checked.
[0012] In any of the above technical solutions, a coordinate measuring machine is further used to measure the reference dimension parameters and the measured dimension parameters.
[0013] In any of the above technical solutions, the following steps are further included before step 100: The mounting groove of the target object is measured and inspected. The optical components were measured and accepted.
[0014] In any of the above technical solutions, a coordinate measuring machine is further used to measure and accept the mounting groove of the target object; The external dimensions of the optical element were measured and accepted using a coordinate measuring machine.
[0015] In any of the above technical solutions, further, according to steps 100 to 300, all mounting grooves in the target object used for mounting the optical element are inspected.
[0016] In any of the above technical solutions, further, in step 200, after establishing the measurement reference coordinate system and measuring the distance from the bottom wall of the mounting groove to the reference surface, the optical element is installed into the mounting groove of the target object, and then the bottom wall of the mounting groove of the target object is used as a reference to measure the dimension parameters of the optical element that are the same as the reference dimension parameters, so as to use them as the measurement dimension parameters.
[0017] In any of the above technical solutions, further, in step 300, if the measured dimension parameter is inconsistent with the reference dimension parameter, it is determined that the burrs on the mounting groove of the target object affect the installation of the optical element. At this time, the test is terminated, the mounting groove on the target object is inspected and repaired, and then step 200 is repeated until the measured dimension parameter is consistent with the reference dimension parameter.
[0018] In any of the above technical solutions, further, all the optical elements are installed into the corresponding mounting grooves on the qualified target object, and the actual assembly error of the optical elements in the target object is measured using a second optical measuring device, and the measured assembly error of each optical element is compared with the allowable assembly error of the optical element calculated in the design stage.
[0019] Compared with the prior art, the beneficial effects of this application are as follows: This application proposes an assembly and testing method suitable for dual telecentric imaging systems. This method cleverly uses optical components, such as lenses, as measuring fixtures for target objects, such as lens barrels, so that the measurement and acceptance of target objects, such as lens barrels, can be connected with the subsequent integration and installation of optical components, such as lenses. This can effectively check whether there are burrs or flashes on the target objects, such as lens barrels, that affect the assembly error of optical components, such as lenses.
[0020] It is evident that the assembly and adjustment test method for dual telecentric imaging systems provided in this application can guide machining manufacturers in inspecting whether high-precision lens barrels are qualified or guide dual telecentric imaging system manufacturers in troubleshooting lens installation position deviations during the acceptance of high-precision lens barrels. Attached Figure Description To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.
[0021] Figure 1 This is a schematic diagram showing the maximum thickness of the lens provided in Embodiment 1 of this application; Figure 2 This is a schematic diagram of the use of a coordinate measuring machine to detect the mounting groove of a target object according to Embodiment 1 of this application; Figure 3 This is a partially enlarged schematic diagram of the detection of the mounting groove of a target object using a coordinate measuring machine, provided in Embodiment 1 of this application. Figure 4This is a schematic diagram showing the maximum thickness of an optical element, provided in Embodiment 1 of this application, being measured using a coordinate measuring machine when the optical element is installed in the mounting groove of a target object. Figure 5 A schematic diagram illustrating the maximum thickness of different optical elements provided in Embodiment 1 of this application; Figure 6 This is a schematic diagram of the assembly and testing method for a dual telecentric imaging system provided in Embodiment 2 of this application; Figure 7 This is a schematic diagram of the assembly and testing method for a dual telecentric imaging system provided in Embodiment 2 of this application; Figure 8 This is a schematic diagram of the steps of the assembly and testing method for a dual telecentric imaging system provided in Embodiment 2 of this application.
[0022] Figure label: 1-Lens barrel, 11-Mounting groove, 111-Bottom wall surface, 112-Side wall surface, 12-Machining residue, 2-Optical element, 21-First side surface, 22-Second side surface, 221-Second tapered mating surface, 3-Threaded pressure ring, 4-Probe, A-Reference surface. Detailed Implementation
[0023] The technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this application, but not all embodiments.
[0024] The components of the embodiments of this application described and shown in the accompanying drawings can be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of this application provided in the drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application.
[0025] Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.
[0026] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0027] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.
[0028] The following reference Figures 1 to 8 This application describes a method for assembly and testing a dual telecentric imaging system according to some embodiments thereof.
[0029] Example 1 See Figures 1 to 4 As shown, embodiments of this application provide an assembly and testing method suitable for a dual telecentric imaging system, comprising the following steps: Step 100: Measure at least one dimensional parameter of the optical element 2 as a reference dimensional parameter; Step 200: Install the optical element 2 in the mounting groove 11 of the target object, and then measure the same dimension parameters of the optical element 2 as the reference dimension parameters with the mounting groove 11 of the target object as the measurement dimension parameters; Step 300: Compare the measured dimension parameters with the reference dimension parameters. If they are consistent, it is determined that the burrs on the mounting groove 11 on the target object will not affect the installation of the optical element 2. If they are inconsistent, it is determined that the burrs on the mounting groove 11 on the target object affect the installation of the optical element 2. At this time, the test is terminated and the mounting groove 11 on the target object is checked.
[0030] It should be noted that in this embodiment, preferably, the optical element 2 is a lens and the target object is the lens barrel 1. This will be used as an example in the following description. Of course, the optical element 2 is not limited to a lens, but can also be other optical elements 2 such as a light-transmitting sheet, etc. The target object is not limited to the lens barrel 1, but can also be other structures such as a mounting base, etc. The specific selection depends on the actual needs.
[0031] In addition, it should be noted that the structure opened on the side wall of the central hole of the lens barrel 1 when installing the groove 11 makes the middle area of the bottom wall of the mounting groove 11 hollow, which serves to avoid the lens. Of course, this part is existing technology and will not be described in detail here.
[0032] As can be seen from the structure described above, this application proposes an assembly and testing method suitable for dual telecentric imaging systems. This method cleverly uses optical elements 2, such as lenses, as measuring fixtures for target objects, such as lens barrels 1, so that the measurement and acceptance work of target objects, such as lens barrels 1, and the subsequent integration and installation work of optical elements 2, such as lenses, can be connected. This can effectively check whether there are processing residues 12 such as burrs and flashes on the target objects, such as lens barrels 1, which affect the assembly error of optical elements 2, such as lenses.
[0033] It is evident that the assembly and adjustment test method for dual telecentric imaging systems provided in this application can guide machining manufacturers in inspecting whether the high-precision lens barrel 1 is qualified or guide dual telecentric imaging system manufacturers in troubleshooting the reasons for lens installation position deviations when accepting the high-precision lens barrel 1.
[0034] Furthermore, preferably, the optical element is installed into the mounting groove 11 of the target object and tightened using a threaded retainer 3. Then, the dimensional parameters of the optical element are measured using the mounting groove 11 of the target object as a reference, and these dimensional parameters are the same as the reference dimensions. This measurement dimensional parameter ensures the accuracy of the test results. The threaded retainer 3 is connected to the lens barrel 1 via threads. It should also be noted that if it is determined that burrs on the mounting groove 11 of the target object affect the proper installation of the optical element 2, the test is terminated. In this case, the threaded retainer 3 and the optical element 2 need to be removed from the lens barrel 1 to inspect the mounting groove 11 of the target object.
[0035] Further, preferably, in step 200, after establishing the measurement reference coordinate system and measuring the distance from the bottom wall of the mounting groove to the reference surface A, the optical element is installed into the mounting groove of the target object. Then, using the bottom wall of the mounting groove of the target object as a reference, the dimensional parameters of the optical element that are the same as the reference dimensional parameters are measured as the measurement dimensional parameters. Of course, this is not the only option; other options can be selected according to actual needs.
[0036] In addition, it should be noted that the optical element 2 used in the testing process, such as the lens, can be the lens used in actual use or a lens specifically for testing. When a lens specifically for testing is used, the accuracy of this lens can be the same as that of the lens used in actual use, or it can be higher than that of the lens used in actual use. The specific choice depends on the actual needs.
[0037] Furthermore, it should be noted that in this embodiment, optical element 2 is a meniscus mirror; however, it is not limited to this, see [link to relevant documentation]. Figure 5 As shown, the optical element 2 can also be a plano-convex mirror, a biconcave mirror, a plano-concave mirror, a parallel plate glass, a meniscus-biconvex cemented mirror, or a biconvex-biconcave cemented mirror, etc. Of course, it is not limited to the examples mentioned above, and can be selected according to actual needs.
[0038] In this embodiment, preferably, as follows: Figures 1 to 4 As shown, the mounting groove 11 includes a bottom wall surface 111 and a side wall surface 112 arranged perpendicularly. The side wall surface 112 is a cylindrical surface, preferably a prism surface, but it is not limited to this and can also be a prism surface, etc., depending on the actual needs. The bottom wall surface 111 is annular, preferably annular, but it is not limited to this and can also be annular structures of other shapes, depending on the actual needs. The bottom wall surface 111 supports the optical element 2, such as a lens, and the side wall surface 112 limits the side wall of the optical element, such as the lens. This is a conventional structure and will not be described in detail here. Along the assembly direction of the optical element 2 and the mounting groove 11, the optical element 2 forms a first side surface 21 and a second side surface 22 arranged opposite to each other. The first side surface 21 cooperates with the bottom wall surface 111 of the mounting groove 11, and the second side surface 22 is arranged away from the bottom wall surface 111 of the mounting groove 11, which meets the usage requirements.
[0039] In this embodiment, preferably, as follows: Figures 1 to 4 As shown, when the bottom wall surface 111 is the first flat mating surface, and the first side surface 21 includes a second flat mating surface adapted to the first flat mating surface, and the second flat mating surface mates with the first flat mating surface, the assembly and adjustment test method applicable to the dual telecentric imaging system includes the following steps: In step 100, the maximum thickness of the optical element 2, such as the lens, along the central axis is measured as a reference size parameter. Of course, it is not limited to using the maximum thickness of the optical element 2, such as the lens, as a reference size parameter; other parameters of the optical element 2, such as the lens, can also be selected as reference size parameters. In step 200, with the optical element 2, such as a lens, mounted in the mounting groove 11 of the target object, such as the lens barrel 1, the maximum height difference along the central axis between the second side surface 22 of the optical element 2, such as the lens, and the bottom wall surface 111 of the mounting groove 11 is measured as a measurement dimensional parameter. In step 300, the maximum height difference between the measured second side surface 22 of the optical element 2 (e.g., the lens) and the bottom wall surface 111 of the mounting groove 11 (i.e., the measured size parameter) is compared with the maximum thickness of the optical element 2 (e.g., the lens) (i.e., the reference size parameter). If the two are consistent, it is determined that the burrs on the mounting groove 11 on the target object (e.g., the lens barrel 1) will not affect the installation of the optical element 2 (e.g., the lens). If the two are inconsistent, it is determined that the burrs on the mounting groove 11 on the target object (e.g., the lens barrel 1) affect the installation of the optical element 2 (e.g., the lens). At this time, the test is terminated, and the mounting groove 11 on the target object (e.g., the lens barrel 1) is inspected.
[0040] As can be seen from the structure described above, using the maximum thickness of the optical element 2, such as the lens, as the reference size parameter makes measurement easier and more intuitive. After the optical element 2, such as the lens, is installed into the mounting groove 11 of the target object, such as the lens barrel 1, the maximum height difference on the central axis between the second side surface 22 of the optical element 2, such as the lens, and the bottom wall surface 111 of the mounting groove 11 is measured with the bottom wall of the mounting groove 11 as the reference. The detection process is also simple, clear, and intuitive, making it simpler and more convenient to use this method to detect the lens barrel 1, saving time and effort, and helping to improve detection efficiency and accuracy.
[0041] Based on the above, this application proposes an assembly and testing method suitable for dual telecentric imaging systems. This method cleverly uses optical elements 2, such as lenses, as measuring fixtures for target objects, such as lens barrels 1, so that the measurement and acceptance work of target objects, such as lens barrels 1, and the subsequent integration and installation work of optical elements 2, such as lenses, can be connected. This can effectively check whether there are processing residues 12 such as burrs and flashes on the target objects, such as lens barrels 1, which affect the assembly error of optical elements 2, such as lenses.
[0042] It is evident that the assembly and adjustment test method for dual telecentric imaging systems provided in this application can guide machining manufacturers in inspecting whether high-precision lens barrels are qualified or guide dual telecentric imaging system manufacturers in troubleshooting lens installation position deviations during the acceptance of high-precision lens barrels.
[0043] In this embodiment, preferably, a coordinate measuring machine (CMM) is used to measure the reference dimension parameters and the measured dimension parameters. This method offers high measurement accuracy and ease of operation. However, it is not limited to this method and can be selected according to actual needs. It should be noted that: Figure 2 The image shows probe 4 of the coordinate measuring machine.
[0044] In this embodiment, preferably, the following steps are included before step 100: The mounting groove 11 of the target object, such as the lens barrel 1, is measured and accepted. The optical element 2, such as the lens, is measured and accepted. As can be seen from the structure described above, by setting up a pre-acceptance step, it is ensured that the measured dimensional tolerances and geometric tolerances of the target object, such as the lens barrel 1 and the optical element 2, such as the lens, conform to the design tolerances indicated in their respective drawings, thus guaranteeing the accuracy of subsequent inspections.
[0045] It should be noted that this step can be performed by different entities. For example, this pre-acceptance step can be performed by the manufacturer of the target object, such as lens barrel 1, and optical components 2, such as lenses, to ensure the processing quality of mechanical parts like lens barrel 1. Then, the user unit performs the subsequent steps as the final acceptance test. In other words, the user unit may not need to set up the aforementioned pre-acceptance step, as this step has already been completed by the manufacturer. Of course, this is not the only possibility. Both the pre-acceptance step and the subsequent steps can be performed by the user unit, or both can be performed by the manufacturer. In this case, the user unit can provide lens drawings, and the lens barrel 1 manufacturer can process a metal dummy lens with the required dimensional tolerances, which can then be used as an inspection tooling during the lens barrel 1 parts processing. Naturally, the specific personnel performing these steps can be chosen according to actual needs and are not limited to the above.
[0046] In this embodiment, preferably, a coordinate measuring machine is used to measure and accept the mounting groove 11 of the target object, such as the lens barrel 1. This is a commonly used device in the prior art, which is convenient to use and has low cost. Of course, it is not limited to using a coordinate measuring machine to measure and accept the mounting groove 11 of the target object, such as the lens barrel 1. Other types of measuring devices can also be used, depending on the actual needs.
[0047] In this embodiment, preferably, a coordinate measuring machine is used to measure and accept the external dimensions of the optical element 2, such as a lens. This is a commonly used device in the prior art, which is convenient to use and has low cost. Of course, it is not limited to using a profilometer to measure and accept the optical element 2, such as a lens; other types of measuring devices can also be used, depending on actual needs. In this embodiment, preferably, steps 100 to 300 are performed to inspect all the mounting grooves 11 for mounting optical elements 2, such as lenses, in the target object, such as the lens barrel 1, so as to ensure the processing tolerance of each optical element 2 (each lens) and the target object (mainly referring to the parts such as the lens barrel 1 that affect the actual assembly error of the lens), and then the actual assembly error of each optical element 2, such as the lens, in the dual telecentric imaging system is controlled by the dimensional tolerance between the parts.
[0048] In this embodiment, preferably, in step 300, if the measured size parameter is inconsistent with the reference size parameter, it is determined that the burr on the mounting groove 11 on the target object, such as the lens barrel 1, affects the installation of the optical element 2, such as the lens, in place. At this time, the test is terminated, the mounting groove 11 on the target object, such as the lens barrel 1, is inspected, and the mounting groove 11 on the target object, such as the lens barrel 1, is repaired. Then, step 200 is repeated until the measured size parameter is consistent with the reference size parameter.
[0049] In other words, in step 300, if the maximum height difference along the central axis between the second side surface 22 of the optical element 2 (e.g., the lens) and the bottom wall surface 111 of the mounting groove 11 is inconsistent with the maximum thickness of the optical element 2 (e.g., the lens), it is determined that the burrs on the mounting groove 11 on the target object (e.g., the lens barrel 1) affect the installation of the optical element 2 (e.g., the lens). At this time, the test is terminated, the mounting groove 11 on the target object (e.g., the lens barrel 1) is inspected, and the mounting groove 11 on the target object (e.g., the lens barrel 1) is repaired. Then, step 200 is repeated until the maximum height difference along the central axis between the second side surface 22 of the optical element 2 (e.g., the lens) and the bottom wall surface 111 of the mounting groove 11 is consistent with the maximum thickness of the optical element 2 (e.g., the lens). As can be seen from the structure described above, when it is determined that the burrs on the mounting groove 11 on the target object, such as the lens barrel 1, affect the installation of the optical element 2, such as the lens, the test is terminated. It is necessary to carefully inspect all parts of the mounting groove 11 on the target object, such as the lens barrel 1, and to reprocess the problematic parts of the mounting groove 11 on the target object, such as the lens barrel 1. Then, step 200 is repeated until the maximum height difference along the central axis between the second side surface 22 of the optical element 2, such as the lens, and the bottom wall surface 111 of the mounting groove 11 is consistent with the maximum thickness of the optical element 2, such as the lens. This indicates that the mounting groove 11 on the lens barrel 1 is qualified at this time.
[0050] It should be noted that this method can only be used to determine whether the lens installation is affected by minor burrs. However, the specific location of the minor burrs in the lens barrel 1 needs to be checked and eliminated step by step during the implementation of the solution described in this invention. For example: a) Since the tolerance of the fit between the lens and the shaft hole of the mounting groove 11 should be designed as a clearance fit, the lens should be able to rotate freely around its own axis of rotation within the mounting groove 11 during installation. If it cannot rotate freely, it indicates that there are burrs at the entrance or sidewall of the mounting groove 11 that affect its use. Figure 2 As shown, those skilled in the art should make their own judgments based on the actual situation when implementing this method.
[0051] b) If, after the lens is installed into the lens barrel 1, the maximum height difference between the second side surface 22 of the lens and the bottom surface of the mounting groove 11 is greater than the maximum thickness of the lens itself, it indicates that a tiny burr has appeared at the bottom of the mounting groove 11. This burr could be at the root, bottom surface, or edge of the inner hole of the mounting groove 11. Figure 2 As shown, those skilled in the art should make their own judgments based on the actual situation during implementation.
[0052] This method may not include subsequent trimming of the mounting groove 11 on the target object, such as the lens barrel 1, and then repeating step 200 until the maximum height difference between the second side surface 22 of the optical element 2, such as the lens, and the bottom wall surface 111 of the mounting groove 11 is consistent with the maximum thickness of the optical element 2, such as the lens. In other words, this method only addresses whether the minor machining residues 12, such as burrs and flash, will cause the mechanical parts (lens barrel, etc.) to be unqualified in terms of precision. Whether to trim the minor machining residues 12, such as burrs and flash, can be selected according to actual needs.
[0053] In this embodiment, preferably, all optical elements 2, i.e. all lenses, are installed into the corresponding mounting grooves 11 on a qualified target object, such as the lens barrel 1. The actual assembly error of the lenses in the target object, such as the lens barrel 1, is measured using a second optical measuring device. The measured assembly error of each optical element 2, i.e. each lens, is compared with the allowable assembly error of the optical element 2, i.e. each lens, calculated in the design stage. If the measured error is within the allowable error range, the lens barrel 1 is considered qualified. Then, image quality testing can be further performed. It should be noted that the assembly and testing method for dual telecentric imaging systems provided in this application may not include this step. This method is only intended to address whether minute machining residues such as burrs and flash will cause mechanical parts (such as lens barrels) to fail to meet accuracy standards. In this embodiment, preferably, a coordinate measuring machine is used to measure the maximum thickness of the optical element 2, such as a lens. This is a commonly used device in the prior art, which is convenient to use and has low cost. Of course, it is not limited to using a coordinate measuring machine to measure the maximum thickness of the optical element 2, such as a lens; other types of measuring devices can also be used, depending on actual needs.
[0054] Example 2 See Figure 6 As shown, the assembly and testing method for dual telecentric imaging systems in this embodiment is a variation of Embodiment 1. The technical content disclosed in Embodiment 1 will not be described again, and the content disclosed in Embodiment 1 also belongs to the content disclosed in this embodiment.
[0055] In this embodiment, preferably, as follows: Figure 6 As shown, when the bottom wall surface 111 is a first annular spherical surface and the first side surface 21 is a second part of the spherical surface that is adapted to the first annular spherical surface, it can be seen that the second part of the spherical surface is not a complete sphere, but a part of the sphere. Those skilled in the art will understand that when the second part of the spherical surface is matched with the first annular spherical surface, the assembly and testing method applicable to the dual telecentric imaging system includes the following steps: In step 100, the maximum thickness of the optical element 2 along the central axis is measured; In step 200, with the optical element 2 installed in the mounting groove 11 of the target object, the maximum height difference along the central axis between the second side surface 22 of the optical element 2 and the extended surface of the bottom wall surface 111 of the mounting groove 11 is measured. In step 300, the maximum height difference between the second side surface 22 of the optical element 2 and the bottom wall surface 111 of the mounting groove 11 is compared with the maximum thickness of the optical element 2. If the two are consistent, it is determined that the burrs of the mounting groove 11 on the target object will not affect the installation of the optical element 2. If the two are inconsistent, it is determined that the burrs of the mounting groove 11 on the target object affect the installation of the optical element 2. At this time, the test is terminated and the mounting groove 11 on the target object is checked.
[0056] Based on the structure described above, it can be seen that when the bottom wall surface 111 of the mounting groove 11 is a first annular spherical surface, and the optical element 2, such as a lens, is formed with a second spherical surface, as... Figure 6 As shown in -a, the position coordinates of the lowest point of the extended surface of the toroidal sphere relative to the reference plane A are obtained using a coordinate measuring machine; then, keeping the lens barrel 1 fixed on the coordinate measuring machine, after installing the optical element 2, such as a lens, the upper surface of the optical element 2, such as the lens, is measured, as shown in the figure. Figure 6 -b shows; finally, by comparing the distance between the highest point of the upper surface of the optical element 2, such as the lens, i.e., the first side surface 21, and the lowest point of the extension surface of the second part of the sphere, with the maximum thickness value of the optical element 2, such as the lens itself, it can be determined whether the lens is installed in place.
[0057] Further, preferably, in step 200, after establishing the coordinate system and measuring the distance from the bottom wall surface 111 of the mounting groove 11 to the reference surface A, the optical element 2 is installed in the mounting groove 11 of the target object, and the maximum height difference along the central axis between the second side surface 22 of the optical element 2 and the extended surface of the bottom wall surface 111 of the mounting groove 11 is measured.
[0058] Example 3 See Figure 7 As shown, the assembly and testing method for dual telecentric imaging systems in this embodiment is a variation of Embodiment 1. The technical content disclosed in Embodiment 1 will not be described again, and the content disclosed in Embodiment 1 also belongs to the content disclosed in this embodiment.
[0059] See Figure 7 As shown, embodiments of this application provide an assembly and testing method suitable for a dual telecentric imaging system, comprising the following steps: In this embodiment, preferably, as follows: Figure 7As shown, when the bottom wall surface 111 is a first conical mating surface, and the first side surface 21 includes a second conical mating surface 221 that is adapted to the first conical mating surface, and the second conical mating surface 221 mates with the first conical mating surface, the assembly and testing method applicable to the dual telecentric imaging system includes the following steps: Step 100: Using any radial section formed by the mating of the second conical mating surface 221 and the first conical mating surface as a preset radial section, measure the maximum height difference along the central axis between the second side surface 22 of the optical element 2 and the preset radial section, and use it as a reference dimension parameter; Step 200: Install the optical element 2 in the mounting groove 11 of the target object, and then measure the maximum height difference along the central axis between the preset radial section and the second side surface 22. Step 300: Compare the measured maximum height difference with the reference dimension parameter. If the two are consistent, it is determined that the burrs on the mounting groove 11 on the target object will not affect the installation of the optical element 2. If the two are inconsistent, it is determined that the burrs on the mounting groove 11 on the target object affect the installation of the optical element 2. At this time, the test is terminated and the mounting groove 11 on the target object is checked.
[0060] Based on the structure described above, it can be seen that when the bottom wall surface 111 of the mounting groove 11 is a conical surface, and the optical element 2, such as a lens, also has a conical surface, as... Figure 7 As shown in -a, a coordinate measuring machine (CMM) is used to measure any preset radial section formed between the two conical surfaces to obtain the axial dimension of the preset radial section relative to the reference plane A. Then, keeping the lens barrel 1 stationary on the CMM, after installing the optical element 2 (e.g., a lens), the second side surface 22 (e.g., the upper surface) of the optical element 2 (e.g., the lens) is measured. Figure 8 -b shows; finally, based on the axial dimension between the highest point on the central axis of the upper surface of the lens and the preset radial section in the lens barrel 1, and the reference dimension parameters, it can be determined whether the lens is installed in place.
[0061] Further, preferably, in step 200, after establishing the coordinate system and measuring the distance from the bottom wall surface 111 of the mounting groove 11 to the reference surface A, the optical element 2 is installed in the mounting groove 11 of the target object, and then the maximum height difference along the central axis between the preset radial section and the second side surface 22 is measured.
[0062] Example 4 See Figure 8 As shown, the assembly and testing method for dual telecentric imaging systems in this embodiment is a variation of Embodiment 1. The technical content disclosed in Embodiment 1 will not be described again, and the content disclosed in Embodiment 1 also belongs to the content disclosed in this embodiment.
[0063] In this embodiment, preferably, as follows: Figure 8 As shown, when the bottom wall surface 111 is an annular surface formed by rotating around the central axis of the mounting groove 11 with a preset radius, and is a super-toroidal surface, and the first side surface 21 is a third part of the spherical surface, it can be seen that the third part of the spherical surface is not a complete sphere, but a part of the sphere. Those skilled in the art can understand that when the third part of the spherical surface is tangentially fitted with the super-toroidal surface, the assembly and adjustment test method applicable to the dual telecentric imaging system includes the following steps: Step 100: Using the radial section formed by the tangency of the third part of the spherical surface and the super-toroidal surface as the preset radial section, measure the maximum height difference along the central axis between the second side surface 22 of the optical element 2 and the preset radial section, and use it as the reference dimension parameter; Step 200: Install the optical element 2 in the mounting groove 11 of the target object, and then measure the maximum height difference along the central axis between the preset radial section and the second side surface 22. Step 300: Compare the measured maximum height difference with the reference dimension parameter. If the two are consistent, it is determined that the burrs on the mounting groove 11 on the target object will not affect the installation of the optical element 2. If the two are inconsistent, it is determined that the burrs on the mounting groove 11 on the target object affect the installation of the optical element 2. At this time, the test is terminated and the mounting groove 11 on the target object is checked.
[0064] Based on the structure described above, it can be seen that when the bottom wall surface 111 of the mounting groove 11 is a super-ring interface, also known as a McLeod interface, and the optical element 2, such as a lens, forms a third spherical surface, as... Figure 8 As shown in -a, using a coordinate measuring machine, a preset radial section formed by the tangent points of the third part of the sphere and the toroidal surface is obtained. The axial dimension of this preset radial section relative to the reference plane A is then obtained. After keeping the lens barrel 1 stationary on the coordinate measuring machine, and installing the optical element 2 (e.g., a lens), the second side surface 22 (e.g., the upper surface) of the optical element 2 (e.g., the lens) is measured. Figure 8 -b shows; finally, based on the axial dimension between the highest point on the central axis of the upper surface of the lens and the preset radial section in the lens barrel 1, and the reference dimension parameters, it can be determined whether the lens is installed in place.
[0065] Further, preferably, in step 200, after establishing the coordinate system and measuring the distance from the bottom wall surface 111 of the mounting groove 11 to the reference surface A, the optical element 2 is installed in the mounting groove 11 of the target object, and then the maximum height difference between the preset radial section and the second side surface 22 along the central axis is measured.
[0066] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.
Claims
1. A method for assembly and testing of a dual telecentric imaging system, characterized in that, Includes the following steps: Step 100: Measure at least one dimensional parameter of the optical element as a reference dimensional parameter; Step 200: Install the optical element in the mounting groove of the target object, and then measure the optical element's dimension parameters that are the same as the reference dimension parameters, using the mounting groove of the target object as a reference, as the measured dimension parameters; Step 300: Compare the measured dimension parameters with the reference dimension parameters. If they are consistent, it is determined that the burrs in the mounting groove on the target object will not affect the installation of the optical element. If they are inconsistent, it is determined that the burrs in the mounting groove on the target object affect the installation of the optical element. At this time, the test is terminated and the mounting groove on the target object is inspected.
2. The assembly and testing method for a dual telecentric imaging system according to claim 1, characterized in that, The mounting groove includes a bottom wall surface and a side wall surface arranged perpendicularly to each other, wherein the side wall surface is cylindrical and the bottom wall surface is annular; along the assembly direction of the optical element and the mounting groove, the optical element forms a first side surface and a second side surface arranged opposite to each other, wherein the first side surface mates with the bottom wall surface of the mounting groove, and the second side surface is disposed away from the bottom wall surface of the mounting groove.
3. The assembly and testing method for a dual telecentric imaging system according to claim 2, characterized in that, When the bottom wall surface is a first flat mating surface, and the first side surface includes a second flat mating surface adapted to the first flat mating surface, and the second flat mating surface mates with the first flat mating surface, the assembly and adjustment test method applicable to the dual telecentric imaging system includes the following steps: In step 100, the maximum thickness of the optical element along its central axis is measured; In step 200, with the optical element mounted in the mounting groove of the target object, the maximum height difference along the central axis between the second side surface of the optical element and the bottom wall surface of the mounting groove is measured. In step 300, the maximum height difference between the second side surface of the optical element and the bottom wall of the mounting groove is compared with the maximum thickness of the optical element. If the two are consistent, it is determined that the burrs in the mounting groove on the target object will not affect the installation of the optical element. If the two are inconsistent, it is determined that the burrs in the mounting groove on the target object affect the installation of the optical element. At this time, the test is terminated and the mounting groove on the target object is inspected.
4. The assembly and testing method for a dual telecentric imaging system according to claim 2, characterized in that, When the bottom wall surface is a first annular spherical surface, and the first side surface is a second partial spherical surface adapted to the first annular spherical surface, and the second partial spherical surface mates with the first annular spherical surface, the assembly and testing method applicable to the dual telecentric imaging system includes the following steps: In step 100, the maximum thickness of the optical element along its central axis is measured; In step 200, with the optical element mounted in the mounting groove of the target object, the maximum height difference along the central axis between the second side surface of the optical element and the extended surface of the bottom wall of the mounting groove is measured. In step 300, the maximum height difference between the second side surface of the optical element and the bottom wall of the mounting groove is compared with the maximum thickness of the optical element. If the two are consistent, it is determined that the burrs in the mounting groove on the target object will not affect the installation of the optical element. If the two are inconsistent, it is determined that the burrs in the mounting groove on the target object affect the installation of the optical element. At this time, the test is terminated and the mounting groove on the target object is inspected.
5. The assembly and testing method for a dual telecentric imaging system according to claim 2, characterized in that, When the bottom wall surface is a first conical mating surface, and the first side surface includes a second conical mating surface adapted to the first conical mating surface, and the second conical mating surface mates with the first conical mating surface, the assembly and testing method applicable to the dual telecentric imaging system includes the following steps: Step 100: Using any radial section formed by the mating of the second conical mating surface and the first conical mating surface as a preset radial section, measure the maximum height difference along the central axis between the second side surface of the optical element and the preset radial section as a reference dimension parameter; Step 200: Install the optical element in the mounting groove of the target object, and then measure the maximum height difference along the central axis between the preset radial section and the second side surface; Step 300: Compare the measured maximum height difference with the reference dimension parameter. If they are consistent, it is determined that the burrs in the mounting groove on the target object will not affect the installation of the optical element. If they are inconsistent, it is determined that the burrs in the mounting groove on the target object affect the installation of the optical element. At this time, the test is terminated and the mounting groove on the target object is checked.
6. The assembly and testing method for a dual telecentric imaging system according to claim 2, characterized in that, When the bottom wall surface is an annular surface formed by rotating around the central axis of the mounting groove with a preset radius, and is a super-toroidal surface, and the first side surface is a third part of a spherical surface, and the third part of the spherical surface is tangentially fitted to the super-toroidal surface, the assembly and adjustment test method applicable to the dual telecentric imaging system includes the following steps: Step 100: Using the radial section formed by the tangency of the third part of the spherical surface and the super-toroidal surface as the preset radial section, measure the maximum height difference along the central axis between the second side surface of the optical element and the preset radial section as the reference dimension parameter; Step 200: Install the optical element in the mounting groove of the target object, and then measure the maximum height difference along the central axis between the preset radial section and the second side surface; Step 300: Compare the measured maximum height difference with the reference dimension parameter. If they are consistent, it is determined that the burrs in the mounting groove on the target object will not affect the installation of the optical element. If they are inconsistent, it is determined that the burrs in the mounting groove on the target object affect the installation of the optical element. At this time, the test is terminated and the mounting groove on the target object is checked.
7. The assembly and testing method for a dual telecentric imaging system according to claim 1, characterized in that, The reference dimension parameters and the measured dimension parameters are measured using a coordinate measuring machine.
8. The assembly and testing method for a dual telecentric imaging system according to claim 1, characterized in that, The following steps are included before step 100: The mounting groove of the target object is measured and inspected. The optical components were measured and accepted.
9. The assembly and testing method for a dual telecentric imaging system according to claim 8, characterized in that, A coordinate measuring machine was used to measure and accept the mounting groove of the target object. The external dimensions of the optical element were measured and accepted using a coordinate measuring machine.
10. The assembly and testing method for a dual telecentric imaging system according to claim 1, characterized in that, According to steps 100 to 300, all mounting grooves for mounting the optical elements in the target object are inspected; and / or In step 200, after establishing the measurement reference coordinate system and measuring the distance from the bottom wall of the mounting groove to the reference surface, the optical element is installed into the mounting groove of the target object. Then, the dimensional parameters of the optical element that are the same as the reference dimensional parameters are measured with the bottom wall of the mounting groove of the target object as the reference, and these are used as the measurement dimensional parameters.
11. The assembly and testing method for a dual telecentric imaging system according to claim 1, characterized in that, In step 300, if the measured dimension parameter is inconsistent with the reference dimension parameter, it is determined that the burrs on the mounting groove of the target object affect the installation of the optical element. At this time, the test is terminated, the mounting groove on the target object is inspected and repaired, and then step 200 is repeated until the measured dimension parameter is consistent with the reference dimension parameter.
12. The assembly and testing method for a dual telecentric imaging system according to claim 11, characterized in that, All the optical elements are installed into the corresponding mounting grooves on the qualified target object, and the actual assembly error of the optical elements in the target object is measured using a second optical measuring device. The measured assembly error of each optical element is then compared with the allowable assembly error of the optical element calculated during the design phase.