CN113721343B - High-precision attitude sensor optical lens assembly test method - Google Patents
High-precision attitude sensor optical lens assembly test method Download PDFInfo
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- CN113721343B CN113721343B CN202111283282.7A CN202111283282A CN113721343B CN 113721343 B CN113721343 B CN 113721343B CN 202111283282 A CN202111283282 A CN 202111283282A CN 113721343 B CN113721343 B CN 113721343B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/021—Mountings, adjusting means, or light-tight connections, for optical elements for lenses for more than one lens
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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
- G01M11/0292—Testing optical properties of objectives by measuring the optical modulation transfer function
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/025—Mountings, adjusting means, or light-tight connections, for optical elements for lenses using glue
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Abstract
The invention provides a high-precision attitude sensor optical lens assembly test method, which is characterized in that according to the working characteristics of a high-precision attitude sensor, an optical system with optical parameters meeting requirements is designed or selected, secondary assembly test is carried out on each optical lens, a lens cone structure is adjusted according to the actual optical axis direction, and each optical lens and a structural member are subjected to standardized glue fixation treatment, so that the stable and reliable matching of each lens and the lens cone of an optical lens is realized. The invention adopts the high-precision attitude sensor optical lens assembly and test technology, can ensure that the high-precision attitude sensor optical lens is stable and reliable under the conditions of large vibration, strong impact and wide temperature change, and meets the use requirements.
Description
Technical Field
The invention relates to the field of universal star sensors, in particular to an assembly test method for an optical lens of a high-precision attitude sensor.
Background
The optical lens is one of the most important parts in the high-precision attitude sensor, and the detection and navigation precision of the high-precision attitude sensor is directly influenced by the optical imaging quality. The high-precision attitude sensor has the advantages that due to the specific space environment, high-precision measurement output and extremely small volume requirement, the lens for the star sensor is required to be stable and reliable, be suitable for the space environment, have compact appearance and be suitable for installation.
These characteristics of the optical lens of the high-precision attitude sensor make most of the optical lenses unable to meet the use requirements. The following problems are common to the conventional optical lens: (1) the external dimension is too large, and the sensor is not suitable for mounting a high-precision attitude sensor. (2) The high-precision attitude sensor is used in the air with large vibration, strong impact and wide temperature range, and the common lens is difficult to adapt to the use conditions of the high-precision attitude sensor, so that the stability and the reliability cannot meet the requirements; (3) the optical lens assembled on the ground cannot quickly release the air inside under the condition of a space vacuum environment, so that the pressure difference between the inside and the outside of the optical lens is too large, the optical lens is deformed, and the image quality is poor.
Disclosure of Invention
The invention provides an assembly test method for an optical lens of a high-precision attitude sensor, aiming at the technical problems in the prior art, so that the optical lens is ensured to be stable and reliable under the conditions of large vibration, strong impact and wide temperature change, and the use environment and the use requirements of the high-precision attitude sensor are met.
The invention provides a high-precision attitude sensor optical lens assembly test method, wherein the optical lens comprises a front lens barrel, a middle lens barrel, a rear lens barrel, a plurality of optical lenses and space rings arranged among the optical lenses; the assembly test method comprises the following steps: measuring parameters of each lens in the optical lens by using a contourgraph; finishing the processing of all structural members of the optical lens according to the measured parameters of each optical lens and the distance between each optical lens; designing the thickness of a corresponding space ring according to the designed or selected spacing difference between the optical lenses of the optical lens; sequentially installing each optical lens and the corresponding space ring into the front lens cone, the middle lens cone and the rear lens cone, and rotating the front lens cone, the middle lens cone and the rear lens cone through matching threads to finish first assembly; testing and recording optical parameters of the optical lens after the first assembly under the optimal condition by using a transfer function tester; all the optical lenses and the space rings in the optical lens assembled for the first time are screwed out one by one, and the marks of the arrows in the screwing-out direction are made; carrying out standardized glue fixation treatment on each optical lens and each structural component, and carrying out secondary assembly on each optical lens and each space ring according to the mark of a well-made screwing-out direction arrow; and testing the optical parameters of the optical lens assembled for the second time by using a transfer function tester, comparing the optical parameters obtained by the test with the optical parameters under the condition that the optical performance is optimal, and determining whether the optical lens is assembled successfully or assembled unsuccessfully according to the comparison result.
According to the assembling and testing method of the optical lens of the high-precision attitude sensor, provided by the invention, according to the working characteristics of the high-precision attitude sensor, an optical system with optical parameters meeting requirements is designed or selected, secondary assembling and debugging tests are carried out on each optical lens, the structure of the lens barrel is adjusted according to the actual optical axis direction, and standardized glue fixing treatment is carried out on each optical lens and the structural component, so that stable and reliable matching of each lens and the lens barrel of the optical lens is realized. By adopting the assembly and test technology of the optical lens of the high-precision attitude sensor, the optical lens of the high-precision attitude sensor can be ensured to be stable and reliable under the conditions of large vibration, strong impact and wide temperature change, and the use requirement can be met.
Drawings
FIG. 1 is a flow chart of a method for assembling and testing an optical lens of a high-precision attitude sensor according to the present invention;
FIG. 2 is a schematic diagram of an optical lens structure designed or selected according to the present invention;
FIG. 3 is a diagram showing a thickness structure of a front spacer series in an optical lens of the high-precision attitude sensor;
FIG. 4 is a cross-sectional view of an optical lens of the high-precision attitude sensor;
FIG. 5 is a schematic structural view of the front barrel;
FIG. 6 is a schematic diagram of a gas port drilled in the optical lens of the high-precision attitude sensor;
FIG. 7 is a schematic diagram of glue application before the cemented lens III is mounted and placed in the front barrel;
FIG. 8 is a schematic view of glue application before the stepped spacer is mounted and placed in the front barrel;
fig. 9 is a view showing a manner of fixing the thread.
In the drawings, the names of the components represented by the respective reference numerals are as follows:
1. front lens cone, 2, front pressing ring, 3, front spacing ring, 4, stepped spacing ring, 5, diaphragm sheet, 6, middle spacing ring, 7, rear pressing ring, 8, middle lens cone, 9, rear lens cone, 10, spherical lens I, 11, spherical lens II, 12, cemented lens III, 13, cemented lens IV, 14, spherical lens V, 15, spherical lens VI, 1-1, rear fine thread surface, 1-2, spacing ring matching surface, 1-3, diaphragm binding surface, 1-4, lens binding surface, 1-5, lens matching surface, 1-6, stepped spacing ring binding surface, 1-7, stepped spacing ring matching surface, 1-8 and front fine thread surface.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
Example one
The method for assembling and testing the optical lens of the high-precision attitude sensor is provided, and the optical lens comprises a front lens barrel, a middle lens barrel, a rear lens barrel, a plurality of optical lenses and space rings arranged among the optical lenses. As shown in fig. 1, the assembly test method includes: measuring parameters of each lens in the optical lens by using a contourgraph; finishing the processing of all structural members of the optical lens according to the measured parameters of each optical lens and the distance between each optical lens; designing the thickness of a corresponding space ring according to the designed or selected spacing difference between the optical lenses of the optical lens; sequentially installing each optical lens and the corresponding space ring into the front lens cone, the middle lens cone and the rear lens cone, and rotating the front lens cone, the middle lens cone and the rear lens cone through matching threads to finish first assembly; testing and recording optical parameters of the optical lens after the first assembly under the optimal condition by using a transfer function tester; all the optical lenses and the space rings in the optical lens assembled for the first time are screwed out one by one, and the marks of the arrows in the screwing-out direction are made; carrying out standardized glue fixation treatment on each optical lens and each structural component, and carrying out secondary assembly on each optical lens and each space ring according to the mark of a well-made screwing-out direction arrow; and testing the optical parameters of the optical lens assembled for the second time by using a transfer function tester, comparing the optical parameters obtained by the test with the optical parameters under the condition that the optical performance is optimal, and determining whether the optical lens is assembled successfully or assembled unsuccessfully according to the comparison result.
It can be understood that, in order to make the optical lens stably meet the use requirement of the high-precision attitude sensor, according to the working characteristics of the high-precision attitude sensor, the optical system with optical parameters meeting the requirement is designed or selected, the secondary assembly and debugging test is carried out on each optical lens, the lens cone structure is adjusted according to the actual optical axis direction, and the standardized glue fixation treatment is carried out on each optical lens, so that the stable and reliable matching of each lens of the optical lens and the lens cone is realized. Compared with the optical parameters of the optical lens before and after the assembly and debugging of the optical system, the invention discloses the assembly and test technology of a whole set of high-precision attitude sensor optical lens, can ensure that the high-precision attitude sensor optical lens is stable and reliable under the conditions of large vibration, strong impact and wide temperature change, and meets the space use requirement. The method is applied to a plurality of space projects and passes the verification of environment routine tests and flight embarkation tests.
Example two
The method for assembling and testing the optical lens of the high-precision attitude sensor mainly comprises the following steps:
and 101, measuring parameters of each lens in the optical lens by using a profile gauge, and finishing the processing of all structural parts of the optical lens according to the measured parameters of each optical lens and the distance between the optical lenses.
The optical system of the optical lens of the high-precision attitude sensor is shown in fig. 2, wherein the optical system mainly comprises a plurality of optical lenses, and the number of the optical lenses is determined according to the actual star measurement performance of the high-precision attitude sensor, and can be increased or decreased.
In the process of assembling and testing the optical lens of the high-precision attitude sensor, all parameters such as the diameter of the lens, the thickness between the vertexes of the lens, the diameter of the convex spherical surface of the lens, the diameter of the concave spherical surface of the lens and the like of each convex lens in the designed or selected optical lens are accurately measured by using a contourgraph, and the design and the processing of all structural parts of the optical lens are guided by the parameters and the lens interval of an optical system. In the embodiment of the invention, firstly, the parameters of each lens in the optical lens are designed, then the parameters of each lens are accurately measured by using the contourgraph, and each lens is processed according to the measured parameters, so that blind processing is avoided.
The matching surfaces of the front lens cone, each lens and the space ring are in uniform clearance fit, and the designed matching clearance is in the range of (+ 0.040- + 0.055), so that the front lens cone, each lens and the space ring can be well matched while the front lens cone, each lens and the space ring are convenient to glue. The binding face of preceding lens cone with each lens, space ring guarantees that the plane degree is not more than 0.015mm, the straightness that hangs down of coaxial line is not more than 0.025mm, guarantees to possess better with the rhythm of the heart between each lens after the assembly is accomplished.
And 102, designing the corresponding spacer thickness according to the designed or selected spacing difference between the optical lenses of the optical lens.
And designing the corresponding spacer thickness according to the designed or selected lens spacing difference of the optical lens. The spacer ring of the optical lens for the first assembly and test needs to be designed with various thicknesses, and fig. 3 is a structure diagram of the series thicknesses of the front spacer ring in the optical lens of the high-precision attitude sensor. The spacer ring is designed into 16 thickness sizes, and the thickness of the spacer ring is designed by symmetrically distributing theoretical or test values from the middle to two ends and mutually spacing difference of 0.03 mm.
103, sequentially installing each optical lens and the corresponding space ring into the front lens cone, the middle lens cone and the rear lens cone, and rotating the front lens cone, the middle lens cone and the rear lens cone through matching threads to finish the first assembly.
And 104, testing and recording optical parameters of the optical lens after the first assembly under the condition that the optical performance reaches the optimal condition by using a transfer function tester.
It can be understood that, after designing parameters of each optical lens and the thickness of each space ring correspondingly, each lens and each space ring are assembled for the first time, and the specific assembling process is that each theoretical or test value thickness space ring and each lens are sequentially arranged in a front lens barrel, a middle lens barrel and a rear lens barrel, the front lens barrel, the middle lens barrel and the rear lens barrel are screwed through matching threads, a letter-of-transmission tester is used for testing optical parameters such as letter, distortion, focal length and the like of the assembled optical lens, and the letter, distortion, focal length and other optical parameters under the condition that the optical performance reaches the best are recorded. If the test parameters do not reach the optical optimal performance, the spacer rings with different thickness values near the theoretical value of each spacer ring are taken for retesting until the optical parameter values of the optical lens reach the optimal values. The thickness value of each actually assembled space ring in the optical lens is recorded, the space ring of the same optical lens of the next batch does not need to be designed in a size with too much thickness, and the space ring with about 7 thicknesses is machined by taking the thickness value of the actually assembled space ring as the center.
105, screwing out all the optical lenses and the space rings in the optical lens assembled for the first time one by one, and marking the arrows in the screwing-out direction;
and 106, carrying out standardized glue fixation treatment on each optical lens and each structural component, and carrying out secondary assembly on each optical lens and each space ring according to the mark of the finished screwing-out direction arrow.
It can be understood that after the optical lens is assembled and tested initially, the internal fastening of the optical lens is performed, so that the optical lens can adapt to complex and severe environments with large vacuum vibration, strong impact and wide temperature change. Firstly, all the lenses and the space rings in the optical lens assembled for the first time are screwed out one by one, the side surfaces of the lenses are marked with in-out arrows by a marking pen, and the lenses are put on a clean optical platform in a word.
The cross-sectional view of the optical lens of the high-precision attitude sensor designed by the embodiment of the invention is shown in fig. 4. The optical lens of the high-precision attitude sensor comprises: the lens comprises a front lens cone 1, a front pressing ring 2, a front spacing ring 3, a stepped spacing ring 4, a diaphragm 5, a middle spacing ring 6, a rear pressing ring 7, a middle lens cone 8, a rear lens cone 9, a first spherical lens 10, a second spherical lens 11, a third cemented lens 12, a fourth cemented lens 13, a fifth spherical lens 14 and a sixth spherical lens 15.
The structure of the front lens barrel 1 is shown in fig. 5, and a rear fine thread surface 1-1, a spacing ring matching surface 1-2, a diaphragm jointing surface 1-3, a lens jointing surface 1-4, a lens matching surface 1-5, a step spacing ring jointing surface 1-6, a step spacing ring matching surface 1-7 and a front fine thread surface 1-8 are arranged on the front lens barrel. Wherein the rear fine thread surface 1-1 is used for fixedly mounting a cemented lens IV 13 (fixed on the middle lens cone 8 through the rear pressing ring 7), a spherical lens V14 (fixed on the rear lens cone 9 through the rear pressing ring 7) and a middle lens cone 8 of a spherical lens VI 15, the middle lens cone 8 is fixed with the rear lens cone 9 through spiral screwing, the spacer matching surface 1-2 is used for matching with the middle spacer 6 and the diaphragm 5, the diaphragm jointing surface 1-3 is used for tightly jointing with the surface and the surface of the diaphragm 5, the lens jointing surface 1-4 is used for coaxially jointing with the surface and the line of the cemented lens III 12, the lens matching surface 1-5 is used for clearance matching with the cemented lens III 12, the ladder spacer jointing surface 1-6 is used for tightly jointing with the surface and the surface of the ladder spacer 4, the ladder spacer matching surface 1-7 is used for matching with the ladder spacer 4, the front fine thread surface 1-8 is used for spiral screwing with the front pressing ring 2, the front pressing ring 2 sequentially presses the spherical lens I10, the front spacing ring 3, the spherical lens II 11, the stepped spacing ring 4 and the cemented lens III 12 into the front lens barrel 1.
In order to ensure that the optical lens can quickly reach the balance of air pressure difference under the condition of a space vacuum environment after assembly and test are finished, the front lens barrel and the rear lens barrel are subjected to electric spark hole punching treatment in a machining stage, the diameter of each hole is 0.5mm, so that gas in the optical lens can be quickly discharged under the condition of pressure difference, and no large dust or sundries can enter the optical lens. Fig. 6 shows a schematic diagram of a gas hole drilled in the optical lens of the high-precision attitude sensor.
After all lenses and space rings in the optical lens after the first assembly are screwed out one by one, standardized glue fixing treatment is carried out on all lenses and structural members of the optical lens, wherein a glue coating schematic diagram before the cemented lens is installed and placed in the front lens cone is shown in fig. 7, the lens matching surface of the front lens cone is divided into six fan-shaped areas with the same size, black silicon rubber is coated on three fan-shaped areas evenly spaced on the lens matching surface of the front lens cone, as shown in fig. 7, 360 degrees of a circle of the lens matching surface of the front lens cone can be divided into 6 fan-shaped areas of 60 degrees, 3 fan-shaped areas of 60 degrees are taken to be coated with the black silicon rubber, the thickness value of the coated silicon rubber is about 0.06mm, and the coating is even as much as possible. After coating, the cemented lens III is lightly put into the front lens barrel according to the arrow marks on the side surface, and the cemented lens III is ensured to reach the lens binding surface of the front lens barrel. The surface of the lens is wiped by absorbent cotton dipped with ether or medical alcohol at any time to ensure that the surface of the lens is clean.
The coating modes of the lens matching surfaces 1-5 of the front lens cone are the same, three uniformly-spaced fan-shaped areas on the matching surface of the stepped space ring of the front lens cone are coated with black silicon rubber, the coating angle is consistent with that of the mounted cemented lens, the thickness value of the coated silicon rubber is about 0.06mm, and the coating is uniform as much as possible. After coating, the step space ring is lightly put into the front lens cone according to the arrow mark on the side surface, and the step space ring is ensured to reach the attaching surface of the step space ring of the front lens cone. And finishing the assembly of the stepped space ring. The glue application schematic before the stepped spacer is installed and placed into the front barrel is shown in fig. 8.
And the other lenses and the space ring are arranged in a front lens cone, a middle lens cone and a rear lens cone in a glue fixing mode according to the assembly of the cemented lens III and the stepped space ring.
The glue fixing mode of the threads refers to a glue coating schematic diagram of fig. 9, after the lenses and the space ring are installed and fastened, the rear lens barrel and each lens in the rear lens barrel are installed in the middle lens barrel through the fine thread surface of the middle lens barrel, two 60-degree sector areas are symmetrically coated on the outer thread surface of the fine thread of the middle lens barrel, as shown in fig. 9, 360-degree circles of the outer thread surface of the fine thread of the middle lens barrel can be divided into 6 60-degree sectors, two 60-degree symmetrical position areas are coated with black silicon rubber, the thickness value of the coated silicon rubber is about 0.2mm, and the coated silicon rubber is uniformly coated as much as possible. After coating, the middle lens barrel together with the rear lens barrel and the lenses in the rear lens barrel is slightly screwed into the rear fine thread surface in the front lens barrel and is screwed, and fastening and assembling of the optical lens are completed. Note that the glue fixing mode of all the thread surfaces including the front pressing ring, the rear lens barrel and the like is consistent with that of the thread surface of the middle lens barrel.
And 107, testing the optical parameters of the optical lens after the second assembly by using a transfer function tester, comparing the optical parameters obtained by the test with the optical parameters under the condition that the optical performance is optimal, and determining whether the optical lens is assembled successfully or assembled unsuccessfully according to the comparison result.
It can be understood that after the lens and the space ring of the optical lens are subjected to glue fixing treatment in the above manner, the optical lens is assembled for the second time in the same manner as the first assembly, after the optical lens is fastened and assembled, the optical performance parameters of the optical lens need to be retested, and are compared with the optical parameters of transfer function, distortion, focal length and the like in the optimum performance state before fastening, if the change rate of any parameter between the two parameters is not more than 8%, the assembly is successful, the fastened optical lens is placed in a drying box for 48 hours, and after the silicon rubber is dried out, the optical lens can be used as a high-precision attitude sensor product. If the change rate of any parameter between the two parameters exceeds 8%, the fastening assembly fails, and each internal lens and each spacer ring are checked before the silicon rubber is dried out to confirm whether the lenses are reversely mounted or obliquely clamped. And the optical lens is disassembled and then fastened and reassembled again, and the optical lens can be used as a product after the test is passed.
Through practice, the optical lens using the assembling and testing technology is applied to a plurality of sets of high-precision attitude sensors of 100 aerospace projects, the test of large vibration, strong impact and wide temperature change is withstood in the space environment, and the reliable optical imaging quality effectively ensures the accurate star measurement of the high-precision attitude sensors.
The method for assembling and testing the optical lens of the high-precision attitude sensor provided by the embodiment of the invention has the following effects:
(1) the optical lens is assembled and tested by designing or selecting an optical system meeting the technical index requirements of a star measurement view field, a star measurement and the like of the high-precision attitude sensor and the technical index requirements of sun and earth atmosphere evasion angles and the like, so that the optical lens of the high-precision attitude sensor can be ensured to be stable and reliable under the conditions of large vibration, strong impact and wide temperature change, and the use requirement is met.
(2) Parameters of each single lens and each combined lens optical system in the optical lens are sequentially tested through a transfer function tester and other measuring tools, test data before the optical lens is assembled and optical parameters corresponding to the optimal optical performance are established, and a basis is provided for the assembly of the subsequent optical lens.
(3) And the design and adjustment of the optical lens barrel and other structural parts are guided according to the actual optical axis pointing adjustment of each single lens and the combined lens optical system, so that the optical lens still has the best imaging precision after the assembly is finished.
(4) Through accurate structural design, a certain interval is kept between each lens and the lens cone, and each lens and the lens cone of the optical lens can be effectively matched and can not be mutually extruded to generate stress within a large temperature difference range.
(5) Each lens of the optical lens and structural components such as the lens barrel, the space ring and the like are subjected to standardized glue fixation treatment according to different modes, so that the optical component and the structural component of the optical lens are perfectly fused into a whole.
(6) Aiming at the situation that the optical lens is deformed and the image quality is deteriorated due to overlarge internal and external pressure difference of the optical lens under the condition of a space vacuum environment, a small hole with the diameter of 0.5mm is processed on a lens barrel of the optical lens by an electric spark machine, so that the balance of the internal and external pressure difference of the optical lens is ensured, and foreign matters are effectively prevented from entering.
(7) Aiming at the problem that certain deviation exists between the theoretical design of the interval between the lenses of the optical system and the actual installation and adjustment, a series of adjusting space rings with the interval of 0.03mm are designed, and the installation and adjustment of the optical lens can be completed in a short time, so that the generalization and batch production of the optical lens of the high-precision attitude sensor are realized.
(8) The common optical lens generally comprises a focusing device and a mounting interface, the radial or axial size of the optical lens can be increased, and the high-precision attitude sensor adopts a fixed-focus star finder and is mounted in a self-mounted mode, so that the common optical lens with overlarge external size cannot be used.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (7)
1. An assembly test method for an optical lens of a high-precision attitude sensor is characterized in that the assembly test method comprises the following steps:
measuring parameters of each lens in the optical lens by using a contourgraph, and finishing the processing of all structural members of the optical lens according to the measured parameters of each optical lens and the distance between each optical lens;
designing the thickness of a corresponding space ring according to the designed or selected spacing difference between the optical lenses of the optical lens;
sequentially installing each optical lens and the corresponding space ring into the front lens cone, the middle lens cone and the rear lens cone, and rotating the front lens cone, the middle lens cone and the rear lens cone through matching threads to finish first assembly;
testing and recording optical parameters of the optical lens after the first assembly under the optimal condition by using a transfer function tester;
all the optical lenses and the space rings in the optical lens assembled for the first time are screwed out one by one, and the marks of the arrows in the screwing-out direction are made;
carrying out standardized glue fixation treatment on each optical lens and each structural component, and carrying out secondary assembly on each optical lens and each space ring according to the mark of a well-made screwing-out direction arrow;
testing the optical parameters of the optical lens assembled for the second time by using a transfer function tester, comparing the optical parameters obtained by the test with the optical parameters under the condition that the optical performance is optimal, and determining whether the optical lens is assembled successfully or assembled unsuccessfully according to the comparison result;
the optical lens comprises a front lens barrel, a front pressing ring, a front spacing ring, a stepped spacing ring, a diaphragm, a middle spacing ring, a rear pressing ring, a middle lens barrel, a rear lens barrel, a spherical lens I, a spherical lens II, a cemented lens III, a cemented lens IV, a spherical lens V and a spherical lens VI, wherein the front lens barrel is provided with a rear fine thread surface, a spacing ring matching surface, a diaphragm jointing surface, a lens matching surface, a stepped spacing ring jointing surface, a stepped spacing ring matching surface and a front fine thread surface;
the rear fine-tooth threaded surface is used for fixedly mounting a middle lens barrel of a cemented lens IV, a spherical lens V and a spherical lens VI, the spacer ring matching surface is used for matching with the middle spacer ring and the diaphragm plate, the diaphragm attaching surface is used for tightly attaching with the surface and the surface of the diaphragm plate, the lens attaching surface is used for coaxially attaching with the surface and the line of a cemented lens III, the lens matching surface is used for clearance fit with a cemented lens III, the ladder spacer ring attaching surface is used for tightly attaching with the surface and the surface of a ladder spacer ring in the same step, the ladder spacer ring matching surface is used for matching with the ladder spacer ring, and the front fine-tooth threaded surface is used for spirally and spirally closing with the front pressing ring;
carry out the solid processing of gluing of standardization to each optical lens and structure to according to the screw-out direction mark of doing, carry out the second time assembly to each optical lens and space ring, include:
dividing the lens matching surface of the front lens cone into six fan-shaped areas with the same size, coating black silicon rubber on three fan-shaped areas uniformly spaced on the lens matching surface of the front lens cone, wherein the thickness value of the coated silicon rubber is about 0.06mm, the coating is uniform, and after the coating is finished, slightly placing the cemented lens III into the front lens cone according to the arrow mark;
dividing the matching surface of the stepped space ring of the front lens cone into six fan-shaped areas with the same size, coating black silicon rubber on three fan-shaped areas uniformly spaced on the matching surface of the stepped space ring of the front lens cone, wherein the coating angle is consistent with that of a mounted cemented lens, the thickness value of the coated silicon rubber is about 0.06mm, the three fan-shaped areas are uniformly coated, and after the coating is finished, the stepped space ring is lightly placed into the front lens cone according to the arrow mark, so that the stepped space ring is ensured to reach the jointing surface of the stepped space ring of the front lens cone, and the assembly of the stepped space ring is finished;
after the lenses and the space ring are installed and fastened, the rear lens barrel and each lens in the rear lens barrel are installed in the middle lens barrel through the fine thread outer surface of the middle lens barrel, the fine thread outer surface of the middle lens barrel is divided into six fan-shaped areas with the same size, two symmetrical fan-shaped areas are coated with black silicon rubber, the thickness value of the coated silicon rubber is about 0.2mm, the coating is uniform, after the coating is finished, the rear lens barrel and the middle lens barrel of each lens in the rear lens barrel are slightly screwed into the rear fine thread surface in the front lens barrel and screwed, the fastening and assembling of the optical lens are finished, wherein the glue fixing mode of all the thread surfaces of the front pressing ring, the rear pressing ring and the rear lens barrel is consistent with the glue fixing mode of the thread surfaces of the middle lens barrel.
2. The method for testing the assembly of an optical lens according to claim 1, wherein the front barrel is in clearance fit with the mating surfaces of the optical lenses and the space ring, and the fit clearance is in the range of + 0.040- + 0.055; the planeness of the binding surfaces of the front lens cone, each optical lens and the spacing ring is not more than 0.015mm, and the verticality of the coaxial line is not more than 0.025 mm.
3. The optical lens fitting test method according to claim 1, further comprising:
and carrying out electric spark hole drilling treatment on the front lens cone and the rear lens cone at the mechanical processing stage, wherein the diameter of a small hole is 0.5 mm.
4. An optical lens assembly testing method according to claim 1, wherein designing the corresponding spacer thickness according to the designed or selected difference in pitch between the optical lenses of the optical lens comprises:
the thickness of the spacing ring is designed according to the theoretical value or the measured value of the spacing difference between the optical lenses, and the theoretical value or the measured value is symmetrically distributed from the middle to the two ends, so that various thicknesses of each spacing ring are obtained.
5. The method for testing the assembly of an optical lens according to claim 4, wherein the designing the thickness of the spacer according to the theoretical value or the measured value of the distance difference between the optical lenses symmetrically distributed from the center to both ends comprises:
according to the theoretical value or the measured value of the distance difference between the optical lenses, the thickness of the spacing ring is designed in a manner that the distance between the thicknesses is 0.03mm and the thicknesses are symmetrically distributed from the middle to the two ends.
6. The method for assembling and testing an optical lens according to claim 4, wherein the assembling of the first time by sequentially mounting each optical lens and the corresponding spacer into the front barrel, the middle barrel and the rear barrel and rotating the front barrel, the middle barrel and the rear barrel through the matching screw comprises:
sequentially installing the space ring and each optical lens with each theoretical value or test value thickness into the front lens cone, the middle lens cone and the rear lens cone, screwing the front lens cone, the middle lens cone and the rear lens cone through matching threads, and testing optical parameters of the assembled optical lens by using a transfer function tester;
if the optical parameters of the tested optical lens do not reach the optimal optical performance, the spacing rings with different thicknesses are replaced and reassembled until the optical parameters of the optical lens reach the optimal optical performance, and the first assembly of the optical lens is completed.
7. The method according to claim 1, wherein the optical parameters at least include transfer function, distortion and focal length, the comparing the optical parameters obtained from the test with the optical parameters under the condition that the optical performance is optimal, and determining whether the optical lens is assembled successfully or assembled unsuccessfully according to the comparison result comprises:
if the change rate of any parameter between the two is not more than 8%, the assembly is successful, the fastened optical lens is placed in a drying box for 48 hours, and after the silicon rubber is dried completely, the optical lens can be used as a high-precision attitude sensor product;
if the change rate of any parameter between the two exceeds 8%, the fastening assembly fails, the internal lenses and the space ring are checked before the silicon rubber is completely dried, whether the internal lenses and the space ring are reversely installed or obliquely clamped is determined, the optical lens is fastened and reassembled again after being disassembled, and the optical lens can be used as a product after the test.
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