A method for detecting impact resistance of a collimating lens glass lens

Abstract

The present application relates to the technical field of optical lens detection, and particularly relates to a kind of machine sighting lens glass lens impact resistance detection method, the method includes the parameter data of the machine sighting lens glass lens to be detected;Based on the curvature and shape regularity degree of the machine sighting lens glass lens to be detected, the impact resistance detection center area of the glass lens is determined;Based on the deviation degree of the center area of the machine sighting lens glass lens to be detected and the shape feature tendency value of the edge area, initial clamping position is determined;Whether the machine sighting lens glass lens to be detected occurs displacement and deformation degree after single impact test is determined whether to determine clamping position again;Based on the displacement direction and deformation distribution dense area optimization determination of the machine sighting lens glass lens to be detected, final clamping position is determined, and the precision of detection area and clamping position positioning in machine sighting lens glass lens impact resistance detection and the accuracy of machine sighting lens glass lens impact resistance detection are improved by the above method.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of optical lens detection, and in particular to a method for detecting the impact resistance of a glass lens of a sighting lens. BACKGROUND

[0002] As a core component in the fields of weapon aiming, industrial detection, security monitoring, etc., the impact resistance of the glass lens of a sighting lens directly affects the reliability and safety of the equipment. Traditional methods for detecting the impact resistance of the lens mostly use a single parameter (such as fixed-height ball impact) or static testing, without considering the complex vibration-impact coupling conditions in actual applications (such as the superposition of jolt vibration and collision of a vehicle-mounted device, or the recoil impact of a military equipment after shooting), nor relating to the functional failure risks such as sealing performance and optical performance. In addition, existing detection methods do not customize the testing for the defect sensitivity of special material lenses such as sapphire and microcrystalline glass, and the differentiated requirements of different application scenarios (military, industrial, outdoor), resulting in a disconnection between the detection results and the actual failure modes, and making it difficult to meet the quality control requirements of high-precision and high-reliability equipment.

[0003] For example, Chinese Patent Application Publication No. CN112730109A discloses a detection device, in particular to a tempered glass impact resistance detection device, which aims to solve the technical problem of providing a tempered glass impact resistance detection device that can automatically detect the impact resistance of tempered glass. The tempered glass impact resistance detection device comprises a base plate, a fixing assembly installed on the base plate, a testing assembly installed on the fixing assembly, and a driving assembly installed on the testing assembly. The invention has a driving assembly, which makes the device operation more simple and convenient. Only by controlling the start of the reduction motor, the tempered glass can be automatically detected, and the detection result can be ensured to be accurate. The first wedge-shaped block and the second contact frame cooperate to automatically move the tempered glass to the testing assembly, thereby reducing the burden on the workers without manual control.

[0004] However, the prior art has the problem of inaccurate positioning of the detection area and clamping position in the detection of the impact resistance of the glass lens of the sighting lens, resulting in low accuracy of the detection of the impact resistance of the glass lens of the sighting lens. SUMMARY

[0005] Therefore, the present application provides a method for detecting the impact resistance of the glass lens of a sighting lens to overcome the problem of low accuracy of the detection of the impact resistance of the glass lens of the sighting lens due to inaccurate positioning of the detection area and clamping position in the detection of the impact resistance of the glass lens of the sighting lens in the prior art.

[0006] To achieve the above-mentioned purpose, the present application provides a method for detecting the impact resistance of the glass lens of a sighting lens, comprising:

[0007] In step S1, geometric characteristic parameter data, optical characteristic parameter data and impact detection equipment parameter data of the machine-sighting lens glass lens to be detected are acquired.

[0008] In step S2, a shock resistance detection center region of the machine-sighting lens glass lens to be detected is determined based on the curvature of the machine-sighting lens glass lens to be detected and the shape regularity degree of the machine-sighting lens glass lens to be detected.

[0009] In step S3, an initial clamping position of the machine-sighting lens glass lens to be detected is determined based on the deviation of the shock resistance detection center region from a preset shock resistance detection center region and a shape feature tendency value of an edge region of the machine-sighting lens glass lens to be detected.

[0010] In step S4, repeated impact tests are performed on the machine-sighting lens glass lens to be detected which is clamped, and whether the clamping position of the machine-sighting lens glass lens to be detected is re-determined is determined based on whether displacement of the machine-sighting lens glass lens to be detected occurs after single impact test and the deformation degree of the machine-sighting lens glass lens to be detected.

[0011] In step S5, the clamping position of the machine-sighting lens glass lens to be detected is re-determined based on the displacement direction of the machine-sighting lens glass lens to be detected and a deformation distribution dense region of the machine-sighting lens glass lens to be detected.

[0012] Further, in the step S2, determining the shock resistance detection center region of the machine-sighting lens glass lens to be detected based on the curvature of the machine-sighting lens glass lens to be detected and the shape regularity degree of the machine-sighting lens glass lens to be detected comprises:

[0013] If the curvature of the machine-sighting lens glass lens to be detected is less than a preset curvature and the shape regularity degree of the machine-sighting lens glass lens to be detected is greater than a preset shape regularity degree, the lens center position is determined as the shock resistance detection center region.

[0014] If the curvature of the machine-sighting lens glass lens to be detected is greater than or equal to the preset curvature or the shape regularity degree of the machine-sighting lens glass lens to be detected is less than or equal to the preset shape regularity degree, a continuous region with the smallest curvature of the machine-sighting lens glass lens to be detected is determined as the shock resistance detection center region.

[0015] Further, the shape regularity degree of the machine-sighting lens glass lens to be detected is determined by a standard deviation of lens surface height, the preset curvature is determined according to an average value of historical curvatures of a plurality of same type lenses, and the preset shape regularity degree is determined according to a historical average value of shape regularity degrees of a plurality of same type lenses.

[0016] Further, in the step S3, determining the initial clamping position of the machine-sighted lens glass to be detected based on the deviation degree of the anti-impact detection center region from the preset anti-impact detection center region and the shape feature tendency value of the edge region of the machine-sighted lens glass to be detected comprises:

[0017] If the deviation degree of the anti-impact detection center region from the preset anti-impact detection center region is less than the preset deviation degree and the shape feature tendency value of the edge region of the machine-sighted lens glass to be detected is less than the preset shape feature tendency value, it is determined to select a plurality of support points as the initial clamping position, which are symmetrical to the anti-impact detection center region and along the boundary of the region.

[0018] If the deviation degree of the anti-impact detection center region from the preset anti-impact detection center region is greater than or equal to the preset deviation degree or the shape feature tendency value of the edge region of the machine-sighted lens glass to be detected is greater than or equal to the preset shape feature tendency value, it is determined to select the clamping position with the minimum stress concentration coefficient as the initial clamping position.

[0019] Further, the deviation degree of the anti-impact detection center region from the preset anti-impact detection center region is determined according to the deviation value of the center point of the anti-impact detection center region from the center point of the preset anti-impact detection center region, the preset deviation degree is determined according to the average value of the deviation degrees of the anti-impact detection center regions of a plurality of same type lenses from the preset anti-impact detection center region, the shape feature tendency value is determined by the ratio of the standard deviation to the average value of the edge thickness, and the preset shape feature tendency value is determined according to the average value of the shape feature tendency values of the edge regions of a plurality of same type lenses.

[0020] Further, the stress concentration coefficient is determined according to the ratio of the maximum local stress to the nominal stress.

[0021] Further, in the step S4, determining whether to re-determine the clamping position of the machine-sighted lens glass to be detected based on whether the machine-sighted lens glass to be detected is displaced after single impact test and the deformation degree of the machine-sighted lens glass to be detected comprises:

[0022] If the machine-sighted lens glass to be detected is displaced after single impact test or the deformation degree of the machine-sighted lens glass to be detected is greater than the preset deformation degree, it is determined to re-determine the clamping position of the machine-sighted lens glass to be detected.

[0023] Further, the deformation degree is determined by accurately measuring the planar area of the lens before and after impact test and calculating the area difference, and the preset deformation degree is determined according to the maximum allowable strain value of the lens to be detected.

[0024] Further, the re-determining the clamping position of the machine-sighting lens glass lens based on the deformation distribution dense area of the machine-sighting lens glass lens to be detected comprises selecting a symmetric position of a non-deformation distribution dense area as the clamping position.

[0025] Further, in the step S5, the determining the clamping position of the machine-sighting lens glass lens based on the displacement direction of the machine-sighting lens glass lens to be detected comprises:

[0026] obtaining the displacement amount, the displacement direction of the machine-sighting lens glass lens after single impact detection, and the deformation distribution dense area of the machine-sighting lens glass lens to be detected;

[0027] judging the direction of the force acting on the lens during the impact according to the obtained displacement direction;

[0028] taking the opposite direction of the direction of the force acting on the lens as the clamping position line;

[0029] taking the position with the least deformation degree of the clamping position line as the clamping position.

[0030] Compared with the prior art, the present application has the beneficial effects that the present application determines the impact resistance detection center area of the machine-sighting lens glass lens to be detected through the curvature of the machine-sighting lens glass lens to be detected and the shape regularity degree of the machine-sighting lens glass lens to be detected, according to the curvature of the machine-sighting lens glass lens to be detected being less than a preset curvature and the shape regularity degree of the machine-sighting lens glass lens to be detected being greater than a preset shape regularity degree, it is indicated that the lens is relatively flat, and the deviation of the shape of the lens from the ideal shape is small, the center position of the lens is accurately determined as the impact resistance detection center area, according to the curvature of the machine-sighting lens glass lens to be detected being greater than or equal to a preset curvature or the shape regularity degree of the machine-sighting lens glass lens to be detected being less than or equal to a preset shape regularity degree, it is indicated that the lens is relatively more curved, or the shape regularity of the lens is poor, and the surface has a certain degree of irregularity or deviation, the continuous area with the least curvature of the lens is accurately determined as the impact resistance detection center area, through the above method, the accuracy of the detection area and the clamping position positioning in the impact resistance detection of the machine-sighting lens glass lens and the accuracy of the impact resistance detection of the machine-sighting lens glass lens are improved.

[0031] Further, the application determines the initial clamping position of the machine-sighting lens glass piece to be detected according to the deviation degree of the anti-impact detection center area from the preset anti-impact detection center area and the shape feature tendency value of the edge area of the machine-sighting lens glass piece to be detected. If the deviation degree of the anti-impact detection center area from the preset anti-impact detection center area is less than the preset deviation degree and the shape feature tendency value of the edge area of the machine-sighting lens glass piece to be detected is less than the preset shape feature tendency value, it indicates that the performance distribution of the lens in the key detection area of the design is relatively stable. The anti-impact detection center area is taken as the reference, and a plurality of support points are selected as the initial clamping position along the boundary of the area. If the deviation degree of the anti-impact detection center area from the preset anti-impact detection center area is greater than or equal to the preset deviation degree or the shape feature tendency value of the edge area of the machine-sighting lens glass piece to be detected is greater than or equal to the preset shape feature tendency value, it indicates that there is a significant deviation between the actual anti-impact detection center area of the lens and the ideal area, and there may be a local weak point. The clamping position with the smallest stress concentration coefficient is accurately determined as the initial clamping position. The above method improves the accuracy of the detection area and the clamping position in the anti-impact detection of the machine-sighting lens glass piece and the accuracy of the anti-impact detection of the machine-sighting lens glass piece.

[0032] Further, the application determines whether to re-determine the clamping position of the machine-sighting lens glass piece to be detected according to whether the machine-sighting lens glass piece to be detected is displaced after single impact test and the degree of deformation of the machine-sighting lens glass piece to be detected. If the machine-sighting lens glass piece to be detected is displaced after single impact test or the degree of deformation of the machine-sighting lens glass piece to be detected is greater than the preset degree of deformation, stress concentration phenomenon will occur in some parts. The secondary clamping position should be selected in the area with relatively uniform stress distribution to disperse the impact force and reduce the risk of lens breakage in subsequent tests, thereby improving the accuracy of the anti-impact detection of the lens under different stress conditions. If the machine-sighting lens glass piece to be detected is not displaced after single impact test and the degree of deformation of the machine-sighting lens glass piece to be detected is less than or equal to the preset degree of deformation, it indicates that factors such as clamping force and clamping position can effectively limit the displacement of the lens. The clamping position of the machine-sighting lens glass piece to be detected is accurately determined without re-determination. The above method improves the accuracy of the detection area and the clamping position in the anti-impact detection of the machine-sighting lens glass piece and the accuracy of the anti-impact detection of the machine-sighting lens glass piece.

[0033] Further, the present application re-determines the clamping position of the to-be-detected machine-sighting lens glass lens according to the deformation distribution dense area of the to-be-detected machine-sighting lens glass lens, including selecting the symmetrical position of the non-deformation distribution dense area as the clamping position, avoiding the damage of the weak area caused by clamping in the subsequent detection, obtaining the displacement amount, displacement direction of the to-be-detected machine-sighting lens glass lens after single impact resistance detection, and the deformation distribution dense area of the to-be-detected machine-sighting lens glass lens, determining the direction of the force acting on the lens during the impact process according to the obtained displacement direction, and resisting the displacement trend of the lens caused by the impact in a targeted manner, taking the direction opposite to the direction of the force acting on the lens as the clamping position line, effectively inhibiting the displacement of the lens in the subsequent detection, and taking the position with the minimum deformation degree of the clamping position line as the clamping position, which can minimize the additional deformation of the lens caused by clamping itself. Through the above method, the accuracy of the detection area and the clamping position in the impact resistance detection of the machine-sighting lens glass lens and the accuracy of the impact resistance detection of the machine-sighting lens glass lens are improved. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 The working flowchart of the machine-sighting lens glass lens impact resistance detection method of the embodiment of the present application is shown in the figure.

[0035] Figure 2 The working flowchart of the machine-sighting lens glass lens impact resistance detection method of the embodiment of the present application is shown in the figure.

[0036] Figure 3 The working flowchart of the machine-sighting lens glass lens impact resistance detection method of the embodiment of the present application is shown in the figure.

[0037] Figure 4 The working flowchart of the machine-sighting lens glass lens impact resistance detection method of the embodiment of the present application is shown in the figure. DETAILED DESCRIPTION

[0038] In order to make the purpose and advantages of the present application more clear and obvious, the present application will be further described below in combination with embodiments; it should be understood that the specific embodiments described herein are only used to explain the present application, and do not limit the present application.

[0039] The preferred embodiments of the present application will be described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the present application, and are not intended to limit the protection scope of the present application.

[0040] Please refer to Figures 1-4 shown, Figure 1A work flow chart of the anti-impact detection method for the sighting lens glass lens of the embodiment of the present application is shown in FIG. 1. Figure 2 A work flow chart of the anti-impact detection method for the sighting lens glass lens of the embodiment of the present application for determining whether to re-determine the clamping position of the sighting lens glass lens to be detected is shown in FIG. 2. Figure 3 A work flow chart of the anti-impact detection method for the sighting lens glass lens of the embodiment of the present application for determining the anti-impact detection center area of the sighting lens glass lens to be detected is shown in FIG. 3. Figure 4 A work flow chart of the anti-impact detection method for the sighting lens glass lens of the embodiment of the present application for determining the initial clamping position of the sighting lens glass lens to be detected is shown in FIG. 4.

[0041] The anti-impact detection method for the sighting lens glass lens of the embodiment of the present application comprises the following steps:

[0042] In step S1, the geometric characteristic parameter data, the optical characteristic parameter data and the impact detection equipment parameter data of the sighting lens glass lens to be detected are acquired.

[0043] In step S2, the anti-impact detection center area of the sighting lens glass lens to be detected is determined based on the curvature of the sighting lens glass lens to be detected and the regularity of the shape of the sighting lens glass lens to be detected.

[0044] In step S3, the initial clamping position of the sighting lens glass lens to be detected is determined based on the deviation of the anti-impact detection center area from a preset anti-impact detection center area and the shape feature tendency value of the edge area of the sighting lens glass lens to be detected.

[0045] In step S4, repeated impact tests are performed on the clamped sighting lens glass lens to be detected, and it is determined whether to re-determine the clamping position of the sighting lens glass lens to be detected based on whether the sighting lens glass lens to be detected is displaced after a single impact test and the deformation degree of the sighting lens glass lens to be detected.

[0046] In step S5, the clamping position of the sighting lens glass lens to be detected is re-determined based on the displacement direction of the sighting lens glass lens to be detected and the deformation distribution dense area of the sighting lens glass lens to be detected.

[0047] In the embodiment of the present application, the geometric characteristic parameter data of the sighting lens glass lens to be detected includes but is not limited to "lens diameter, lens thickness and curvature radius", the optical characteristic parameter data includes but is not limited to "refractive index, Abbe number and transmittance", and the impact detection equipment parameter data includes but is not limited to "impact energy, impact head diameter and impact speed".

[0048] Specifically, in step S2, when determining the anti-impact detection center area of the machine-sighting lens glass lens to be detected, the anti-impact detection center area of the machine-sighting lens glass lens to be detected is determined according to the curvature of the machine-sighting lens glass lens to be detected and the regularity degree of the shape of the machine-sighting lens glass lens to be detected.

[0049] When the curvature of the machine-sighting lens glass lens to be detected is less than the preset curvature and the regularity degree of the shape of the machine-sighting lens glass lens to be detected is greater than the preset regularity degree of the shape, the lens center position is determined as the anti-impact detection center area.

[0050] When the curvature of the machine-sighting lens glass lens to be detected is greater than or equal to the preset curvature or the regularity degree of the shape of the machine-sighting lens glass lens to be detected is less than or equal to the preset regularity degree of the shape, the continuous area with the smallest curvature of the machine-sighting lens glass lens to be detected is determined as the anti-impact detection center area.

[0051] In the embodiment of the present application, the lens center position is a circumferential area with a lens center point as a center and 15%-25% of the total area of the lens, and the preferred value of the total area of the lens is 20%. The reason for selecting the preferred value is that the center area of 20% of the total area of the lens neither makes the detection area too large to cause long detection time and increased cost, nor makes the area too small to accurately reflect the anti-impact performance of the lens. The continuous area is determined by the change rate of the curvature of the lens, for example, a professional curvature measuring instrument is used to measure the lens surface at multiple points to determine the point with the smallest curvature, and the point with the smallest curvature is taken as the center to select a circumferential area with 15%-25% of the total area of the lens as the continuous area. The preferred value of the total area of the lens is 20%, but the above-mentioned value is not limited thereto, and the value can be adjusted according to actual needs by those skilled in the art.

[0052] In the embodiment of the present application, the preset curvature is determined according to the average value of the curvatures of a plurality of lenses of the same type, for example, the historical curvatures of two lenses of the same type are 0.04mm -1 and 0.06mm -1 , and the preset curvature is 0.05mm -1 . However, the above-mentioned value is not limited thereto, and the value can be adjusted according to actual needs by those skilled in the art.

[0053] The shape regularity degree of the to-be-detected machine-sighting lens glass lens is determined by the standard deviation of the lens surface height, and the preset shape regularity degree is determined according to the average value of the shape regularity degrees of several same type lenses. For example, the heights of three positions on the lens surface are 5 mm, 6 mm and 8 mm, the standard deviation of the lens surface height is 1.247 mm, and the shape regularity degree of the to-be-detected machine-sighting lens glass lens is 1.247. For example, the historical values of the shape regularity degrees of two same type lenses are 1.2 and 1.3 respectively, and the preset shape regularity degree is 1.25. However, the above values are not limited thereto, and the values can be adjusted according to actual needs by those skilled in the art.

[0054] The present application determines the impact resistance detection center area of the to-be-detected machine-sighting lens glass lens according to the curvature of the to-be-detected machine-sighting lens glass lens and the shape regularity degree of the to-be-detected machine-sighting lens glass lens. When the curvature of the to-be-detected machine-sighting lens glass lens is less than the preset curvature and the shape regularity degree of the to-be-detected machine-sighting lens glass lens is greater than the preset shape regularity degree, it indicates that the lens is relatively flat, and the deviation of the shape of the lens from the ideal shape is small. The precise determination of the center position of the lens as the impact resistance detection center area, when the curvature of the to-be-detected machine-sighting lens glass lens is greater than or equal to the preset curvature or the shape regularity degree of the to-be-detected machine-sighting lens glass lens is less than or equal to the preset shape regularity degree, it indicates that the lens is relatively more curved, or the regularity of the shape of the lens is poor, and there is a certain degree of irregularity or deviation on the surface. The precise determination of the continuous area with the smallest curvature of the lens as the impact resistance detection center area improves the precision of the detection area and the clamping position in the impact resistance detection of the machine-sighting lens glass lens and the accuracy of the impact resistance detection of the machine-sighting lens glass lens.

[0055] Specifically, in step S3, when determining the initial clamping position of the to-be-detected machine-sighting lens glass lens, the initial clamping position of the to-be-detected machine-sighting lens glass lens is determined according to the deviation degree of the impact resistance detection center area from the preset impact resistance detection center area and the shape feature tendency value of the edge region of the to-be-detected machine-sighting lens glass lens;

[0056] When the deviation degree of the impact resistance detection center area from the preset impact resistance detection center area is less than the preset deviation degree and the shape feature tendency value of the edge region of the to-be-detected machine-sighting lens glass lens is less than the preset shape feature tendency value, then a plurality of support points are selected as the initial clamping position along the boundary of the area symmetrically based on the impact resistance detection center area;

[0057] When the deviation of the impact resistance detection center area from the preset impact resistance detection center area is greater than or equal to the preset deviation or the shape feature tendency value of the edge area of the to-be-detected machine-sighting lens glass lens is greater than or equal to the preset shape feature tendency value, the clamping position with the minimum stress concentration coefficient is determined as the initial clamping position.

[0058] The deviation of the impact resistance detection center area from the preset impact resistance detection center area in the embodiment of the application is a deviation value of the center position of the impact resistance detection center area from the center point of the preset impact resistance detection center area, for example, the position coordinates of the center point of the impact resistance detection center area are (3, 4), the position coordinates of the center point of the preset impact resistance detection center area are (1, 1), and the deviation is 3.61. The preset deviation is an average value of the deviations of the impact resistance detection center areas of several same types of lenses from the preset impact resistance detection center area, but the above-mentioned value is not limited thereto, and a person skilled in the art can adjust the value according to actual needs.

[0059] The shape feature tendency value in the embodiment of the application is determined by the ratio of the standard deviation to the average value of the edge thickness, and the preset shape feature tendency value is determined according to the average value of the shape feature tendency values of the edge areas of several same types of lenses, for example, the thicknesses of five equidistant points of the lens edge are 3 mm, 5 mm, 6 mm, 4 mm and 3 mm, the average value of the thicknesses is 1.36 mm, and the shape feature tendency value is 0.32, but the above-mentioned value is not limited thereto, and a person skilled in the art can adjust the value according to actual needs.

[0060] The stress concentration coefficient in the embodiment of the application is determined according to the ratio of the maximum local stress to the nominal stress, for example, the maximum local stress is 150 MPa, the nominal stress is 50 MPa, and the stress concentration coefficient is 3, but the above-mentioned value is not limited thereto, and a person skilled in the art can adjust the value according to actual needs.

[0061] The application determines the initial clamping position of the machine-sighting lens glass lens to be detected by the deviation degree of the anti-impact detection center area from the preset anti-impact detection center area and the shape feature tendency value of the edge area of the machine-sighting lens glass lens to be detected, and according to the deviation degree of the anti-impact detection center area from the preset anti-impact detection center area being less than the preset deviation degree and the shape feature tendency value of the edge area of the machine-sighting lens glass lens to be detected being less than the preset shape feature tendency value, it is indicated that the performance distribution of the lens in the key detection area of the design is relatively stable, and a plurality of support points are selected as the initial clamping position along the boundary of the area symmetrically based on the anti-impact detection center area, according to the deviation degree of the anti-impact detection center area from the preset anti-impact detection center area being greater than or equal to the preset deviation degree or the shape feature tendency value of the edge area of the machine-sighting lens glass lens to be detected being greater than or equal to the preset shape feature tendency value, it is indicated that there is a significant deviation between the actual anti-impact detection center area of the lens and the ideal area, and there may be a local weak point, and the clamping position with the minimum stress concentration coefficient is accurately determined as the initial clamping position, and the accuracy of the detection area and the clamping position positioning in the machine-sighting lens glass lens anti-impact detection and the accuracy of the machine-sighting lens glass lens anti-impact detection are improved through the above method.

[0062] Specifically, in step S4, when whether to redetermine the clamping position of the machine-sighting lens glass lens to be detected, whether to redetermine the clamping position of the machine-sighting lens glass lens to be detected is determined according to whether the machine-sighting lens glass lens to be detected after single impact test is displaced and the deformation degree of the machine-sighting lens glass lens to be detected;

[0063] When the machine-sighting lens glass lens to be detected after single impact test is displaced or the deformation degree of the machine-sighting lens glass lens to be detected is greater than the preset deformation degree, it is determined to redetermine the clamping position of the machine-sighting lens glass lens to be detected;

[0064] When the machine-sighting lens glass lens to be detected after single impact test is not displaced and the deformation degree of the machine-sighting lens glass lens to be detected is less than or equal to the preset deformation degree, it is determined that the clamping position of the machine-sighting lens glass lens to be detected does not need to be redetermined.

[0065] In the embodiment of the application, the deformation degree is determined by accurately measuring the plane area of the lens before and after impact test, and calculating the difference between the plane areas before and after impact, for example, the plane area of the lens before impact test is 5cm 2 , the plane area of the lens after impact test is 6cm 2 , and the deformation degree is 1cm 2 , but the above values are not limited thereto, and the values can be adjusted according to actual needs by those skilled in the art.

[0066] The preset deformation degree in the embodiment of the application is determined according to the maximum allowable strain value of the lens to be detected, and the maximum allowable strain value is set in the range of 0.001 m / m-0.003 m / m, and the preferred value is 0.002 m / m. The reason for selecting the preferred value is that if the maximum allowable strain value is set too low, it may impose too high a requirement on the manufacturing process, increasing the production cost and difficulty; and if it is set too high, it may lead to unstable product quality, increasing the use risk. The preset deformation degree is 0.002 m / m, but the above-mentioned value is not limited thereto, and the person skilled in the art can adjust the value according to actual needs.

[0067] The application determines whether to re-determine the clamping position of the machine-sighting lens glass lens after the displacement of the machine-sighting lens glass lens to be detected after single impact test and the deformation degree of the machine-sighting lens glass lens to be detected. According to the displacement of the machine-sighting lens glass lens to be detected after single impact test or the deformation degree of the machine-sighting lens glass lens to be detected greater than the preset deformation degree, stress concentration phenomenon may occur in some parts, and the secondary clamping position should be selected in the stress concentration area, because these areas have already been subjected to a large stress, and are more likely to break when impacted again. The secondary clamping position should be selected in the area with relatively uniform stress distribution to disperse the impact force and reduce the risk of lens breakage in subsequent tests, thereby improving the accuracy of impact detection of the lens under different stress conditions. According to the fact that the machine-sighting lens glass lens to be detected does not displace and the deformation degree of the machine-sighting lens glass lens to be detected is less than or equal to the preset deformation degree after single impact test, it is indicated that factors such as clamping force and clamping position can effectively limit the displacement of the lens, and the clamping position of the machine-sighting lens glass lens to be detected does not need to be re-determined. The above-mentioned method improves the accuracy of the detection area and the clamping position in the impact detection of the machine-sighting lens glass lens and the accuracy of the impact detection of the machine-sighting lens glass lens.

[0068] Specifically, in step S5, re-determining the clamping position of the machine-sighting lens glass lens to be detected based on the deformation distribution dense area of the machine-sighting lens glass lens to be detected includes selecting the symmetric position of the non-deformation distribution dense area as the clamping position. For example, a circular optical glass machine-sighting lens glass lens with a diameter of 50 mm is subjected to single impact detection, and it is determined by a high-precision optical measurement device that the upper left is a deformation distribution dense area. Three points are selected as new clamping positions in the lower right area of the lens, which are point A 5 mm away from the edge, and point B and point C 30° apart from point A in the clockwise and counterclockwise directions, respectively, and also 5 mm away from the edge. However, the above-mentioned value is not limited thereto, and the person skilled in the art can adjust the value according to actual needs.

[0069] Specifically, in step S5, the step of determining the clamping position of the machine-sighted lens glass based on the displacement direction of the machine-sighted lens glass to be detected comprises:

[0070] Step S5501, obtaining the displacement amount, displacement direction of the machine-sighted lens glass to be detected after single impact detection, and the deformation distribution dense area of the machine-sighted lens glass to be detected;

[0071] Step S5502, judging the direction of the force acting on the lens during the impact according to the obtained displacement direction;

[0072] Step S5503, taking the opposite direction of the direction of the force acting on the lens as the clamping position line;

[0073] Step S5504, taking the position with the minimum deformation degree of the clamping position line as the clamping position.

[0074] The present application can use high-precision displacement sensors and strain gauges, which are respectively installed at the edge and the surface of the lens, to record the displacement amount and the displacement direction of the lens. Assuming that the displacement amount is 2mm and the displacement direction is the positive X direction, the strain gauge records the strain distribution of the lens surface, and a deformation distribution map is generated through data processing software to determine that the deformation distribution dense area is mainly concentrated in the upper right corner of the lens. According to the data of the displacement sensor, the lens moves 2mm along the positive X direction during the impact process, so it can be judged that the lens mainly receives the force along the positive X direction during the impact process. Since the force acting on the lens is along the positive X direction, the clamping position should be selected in the opposite direction of the force, i.e. the negative X direction, which is called the clamping position line. Combined with the deformation distribution map, it is found that the deformation distribution dense area is mainly concentrated in the upper right corner of the lens, which means that the upper right corner of the lens bears a large stress during the impact process. On the clamping position line, find the position with the minimum deformation degree, through the analysis of the deformation distribution map, it is found that the deformation degree of the lower left corner of the lens is the smallest, and the clamping point of the clamping device is adjusted to the minimum deformation area of the lower left corner of the lens.

[0075] The application re-determines the clamping position of the to-be-detected machine-sighting lens glass lens according to the deformation distribution dense area of the to-be-detected machine-sighting lens glass lens, includes selecting the symmetrical position of the non-deformation distribution dense area as the clamping position, avoids the damage of the weak area caused by clamping in the subsequent detection, obtains the displacement amount, displacement direction and deformation distribution dense area of the to-be-detected machine-sighting lens glass lens after single impact resistance detection, judges the action direction of the force suffered by the lens in the impact process according to the obtained displacement direction, targets the displacement trend of the lens caused by the impact, takes the reverse direction of the action direction of the force suffered by the lens as the clamping position line, effectively suppresses the displacement of the lens in the subsequent detection, takes the position with the minimum deformation degree of the clamping position line as the clamping position, can reduce the additional deformation of the lens caused by clamping itself to the maximum extent, and improves the accuracy of the detection area and the clamping position positioning in the impact resistance detection of the machine-sighting lens glass lens and the accuracy of the impact resistance detection of the machine-sighting lens glass lens through the above method.

[0076] So far, the technical solutions of the application have been described in combination with the preferred embodiments shown in the drawings, but those skilled in the art can easily understand that the protection scope of the application is obviously not limited to these specific embodiments. Those skilled in the art can make equivalent changes or replacements to the related technical features without departing from the principles of the application, and the technical solutions after the changes or replacements will fall within the protection scope of the application.

Claims

1. A method for detecting impact resistance of a collimating lens glass lens, characterized in that, The method comprises the following steps: Step S1, acquiring geometric characteristic parameter data, optical characteristic parameter data and impact detection equipment parameter data of a machine-sighting lens glass lens to be detected; Step S2, determining an anti-impact detection center area of the machine-sighting lens glass lens to be detected based on the curvature of the machine-sighting lens glass lens to be detected and the shape regularity of the machine-sighting lens glass lens to be detected; Step S3, determining an initial clamping position of the machine-sighting lens glass lens to be detected based on the deviation of the anti-impact detection center area from a preset anti-impact detection center area and a shape feature tendency value of an edge area of the machine-sighting lens glass lens to be detected; In the step S3, the initial clamping position of the machine-sighting lens glass lens to be detected is determined based on the deviation of the anti-impact detection center area from the preset anti-impact detection center area and the shape feature tendency value of the edge area of the machine-sighting lens glass lens to be detected, and the step comprises the following steps: If the deviation of the anti-impact detection center area from the preset anti-impact detection center area is less than a preset deviation and the shape feature tendency value of the edge area of the machine-sighting lens glass lens to be detected is less than a preset shape feature tendency value, a plurality of support points are selected as the initial clamping position, the support points being symmetrical to the anti-impact detection center area and along the boundary of the area; If the deviation of the anti-impact detection center area from the preset anti-impact detection center area is greater than or equal to the preset deviation or the shape feature tendency value of the edge area of the machine-sighting lens glass lens to be detected is greater than or equal to the preset shape feature tendency value, a clamping position with the smallest stress concentration coefficient is selected as the initial clamping position; The deviation of the anti-impact detection center area from the preset anti-impact detection center area is determined according to the deviation value of the center point of the anti-impact detection center area from the center point of the preset anti-impact detection center area, the preset deviation is determined according to the average value of the deviations of the anti-impact detection center areas of a plurality of same type lenses from the preset anti-impact detection center area, the shape feature tendency value is determined by the ratio of the standard deviation to the average value of the edge thickness, and the preset shape feature tendency value is determined according to the average value of the shape feature tendency values of the edge areas of a plurality of same type lenses; Step S4, performing repeated impact tests on the machine-sighting lens glass lens to be detected after clamping, and determining whether to re-determine the clamping position of the machine-sighting lens glass lens to be detected based on whether the machine-sighting lens glass lens to be detected is displaced after a single impact test and the deformation degree of the machine-sighting lens glass lens to be detected; Step S5, re-determining the clamping position of the machine-sighting lens glass lens to be detected based on the displacement direction of the machine-sighting lens glass lens to be detected and the deformation distribution dense area of the machine-sighting lens glass lens to be detected.

2. The method of claim 1, wherein the method further comprises: In the step S2, the anti-impact detection center area of the machine-sighting lens glass lens to be detected is determined based on the curvature of the machine-sighting lens glass lens to be detected and the shape regularity of the machine-sighting lens glass lens to be detected, and the step comprises the following steps: If the curvature of the to-be-tested sighting lens glass lens is less than the preset curvature and the shape regularity of the to-be-tested sighting lens glass lens is greater than the preset shape regularity, the lens center position is determined as the impact resistance detection center region. If the curvature of the to-be-tested sighting lens glass lens is greater than or equal to the preset curvature or the shape regularity of the to-be-tested sighting lens glass lens is less than or equal to the preset shape regularity, the continuous region with the smallest lens curvature is determined as the impact resistance detection center region.

3. The method of claim 2, wherein the method further comprises: The shape regularity of the to-be-tested sighting lens glass lens is determined by the standard deviation of the lens surface height, the preset curvature is determined according to the average value of the curvatures of a plurality of same type lenses, and the preset shape regularity is determined according to the average value of the shape regularities of a plurality of same type lenses.

4. The method of claim 1, wherein the method further comprises: The stress concentration coefficient is determined according to the ratio of the maximum local stress to the nominal stress.

5. The method of claim 4, wherein the method further comprises: In the step S4, whether to re-determine the clamping position of the to-be-tested sighting lens glass lens is determined based on whether the to-be-tested sighting lens glass lens is displaced after single impact test and the deformation degree of the to-be-tested sighting lens glass lens, and the determination includes: If the to-be-tested sighting lens glass lens is displaced after single impact test or the deformation degree of the to-be-tested sighting lens glass lens is greater than the preset deformation degree, it is determined to re-determine the clamping position of the to-be-tested sighting lens glass lens.

6. The method of claim 5, wherein the method further comprises: The deformation degree is determined by accurately measuring the planar area of the lens before and after impact test and calculating the area difference, and the preset deformation degree is determined according to the maximum allowable strain value of the to-be-tested lens.

7. The method of claim 6, wherein the method further comprises: In the step S5, the clamping position of the to-be-tested sighting lens glass lens is re-determined based on the deformation distribution dense region of the to-be-tested sighting lens glass lens, and the determination includes: selecting the symmetrical position of the non-deformation distribution dense region as the clamping position.

8. The method of claim 7, wherein the method further comprises: In the step S5, the clamping position of the to-be-tested sighting lens glass lens is determined based on the displacement direction of the to-be-tested sighting lens glass lens, and the determination includes: The displacement amount, displacement direction and deformation distribution dense region of the to-be-tested sighting lens glass lens after single impact resistance test are obtained. According to the obtained displacement direction, the direction of the force acting on the lens during impact is judged. The opposite direction of the direction of the force acting on the lens is taken as the clamping position line. The position with the smallest deformation degree based on the clamping position line is taken as the clamping position.

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