Four-reference transmission eccentricity detection method for optical assembly

Abstract

The invention relates to the technical field of optical detection devices, in particular to a four-reference transmission eccentricity detection method for an optical assembly. According to the detection jig and process designed by the scheme of the invention, the actual use scene of an optical assembly product with four-reference connection positioning is fully simulated, so that the detection result has higher actual application value. The method not only improves the detection reliability, but also enhances the integrating degree between the product design and the actual demand of a customer. Through the improved detection scheme, imaging blur and distortion caused by transmission eccentricity can be effectively eliminated, and the imaging definition and precision of the whole machine are improved.

Description

Technical Field

[0001] The invention relates to the technical field of optical detection, and in particular to a method for measuring the transmission eccentricity of a product to be detected using four references of an optical component. Background Art

[0002] In modern microscopy, stereo microscopes are widely used for high-precision observation and photography of tiny objects. Its working principle is to convert the light from the observation target into parallel light through the objective lens and the steering system, and then focus it on the target surface of the CCD camera through the photographic objective lens, so as to form a clear magnified image on the screen. The photographic objective lens is connected to the front optical system and the back end is connected to the CCD camera, so there are four connection positioning benchmarks at both ends. In order to ensure the imaging quality of the microscope system, it is very important to maintain the consistency between the binocular center and the third eye center. If there is eccentricity in the optical path of the system, it will directly affect the clarity and accuracy of the image, resulting in unreliable observation results.

[0003] In the process of eccentricity detection, the traditional method mainly uses the connection reference (reference AB) of the microscope host as the basis for eccentricity detection. Previous practice has shown that ignoring the reference (reference CD) connected to the CCD camera may result in the eccentricity state not being effectively detected, thereby affecting product quality. For example, in early tests, due to the failure to consider multiple reference points for detection at the same time, the equipment had a problem of poor eccentricity in actual use.

[0004] Therefore, it is particularly important to comprehensively detect the transmission eccentricity by considering multiple reference points (such as ABCD). This discovery has prompted the research and development of related technologies, aiming to improve the imaging quality and reliability of microscopes and similar application products to meet the growing demand for precision measurement. Summary of the invention

[0005] In order to solve the above problems, the present invention discloses a method for detecting four-reference transmission eccentricity of an optical component, comprising the following steps:

[0006] The two ends of the optical component barrel to be measured are respectively aligned and matched with the first and second reference positioning fixtures and the third and fourth reference positioning fixtures, wherein the other ends of the first and second reference positioning fixtures are aligned and installed with the parallel light tube, and the other ends of the third and fourth reference positioning fixtures are installed with a reading mirror, and the reading mirror is aligned with the receiver, and the ends of the first and second reference positioning fixtures and the third and fourth reference positioning fixtures corresponding to the optical component barrel to be measured are matched with the end face and axial direction of the optical component barrel to be measured as the positioning reference; the other ends of the third and fourth reference positioning fixtures are matched with the end face and axial direction of the reading mirror as the positioning reference, and the graticule of the reading mirror coincides with the focal plane of the optical component;

[0007] Rotate the lens barrel of the optical component to be tested and keep the reading microscope stationary, obtain the image information of the reading microscope graticule through the receiver, and use the jumping track size of the transmission eccentricity image on the receiver display relative to the reading microscope graticule to serve as the transmission eccentricity value of the lens barrel of the optical component to be tested based on both the end face and the axial direction.

[0008] Wherein, the graticule of the reading microscope has grid-like lines, which serve as reference lines for evaluating the size of the transmission eccentric imaging jump.

[0009] The receiver is an electronic collimator that only receives parallel light and can receive the graticule image of the reading microscope and the focus image of the optical component to be measured.

[0010] The first and second reference positioning fixtures are aligned with the first and second reference structures of the optical component to be tested, and can be sleeved on the first and second references of the lens barrel of the optical component to be tested, with the other end aligned with the parallel light tube.

[0011] The third and fourth reference positioning fixtures are aligned according to the structures of the third and fourth references of the optical component to be measured, and the other end is aligned with the connection positioning reference of the reading mirror.

[0012] The detection fixture and process designed in this solution of the present application fully simulate the actual use scenario of the optical component product with four reference connection positioning, making the detection results more practical. This method not only improves the reliability of detection, but also enhances the fit between product design and actual customer needs. Through the improved detection scheme, the imaging blur and distortion caused by transmission eccentricity can be effectively eliminated, and the imaging clarity and accuracy of the whole machine can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the structure of the optical component lens barrel to be tested in an embodiment of the present application;

[0014] Figure 2 It is a schematic diagram of the cooperation between the lens barrel of the optical component to be tested and the first and second reference positioning fixtures and the third and fourth reference positioning fixtures in the embodiment of the present application;

[0015] Figure 3 This is a schematic diagram of the structure of the third and fourth reference positioning fixtures in the embodiment of the present application;

[0016] Figure 4 Schematic diagram of the structure of the first and second reference positioning fixtures in the embodiment of the present application.

[0017] Figure 5 Schematic diagram of the detection principle in the embodiment of the present application;

[0018] Figure 6 This is a physical diagram of the embodiment of the present application;

[0019] Figure 7 It is a schematic diagram of actual measurement results in the embodiments of the present application. DETAILED DESCRIPTION

[0020] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. The principles and features of the present invention are described below in conjunction with the drawings. The examples are only used to explain the present invention, not to limit the scope of the present invention.

[0021] The terms "including" and other expressions with similar meanings in the specification or claims of the present invention and the above-mentioned drawings are intended to cover non-exclusive inclusions, such as a process, method or system, or device comprising a series of steps or units is not limited to the listed steps or units.

[0022] Embodiment 1: A method for measuring the transmission eccentricity of a product to be tested using four references of an optical component, comprising the following steps:

[0023] S101: (such as Figure 2 (As shown in the installation schematic diagram in the figure), the two ends of the optical component barrel to be measured are respectively aligned with the first and second reference positioning fixtures and the third and fourth reference positioning fixtures, wherein the other ends of the first and second reference positioning fixtures are aligned with the parallel light tube, and the other ends of the third and fourth reference positioning fixtures are installed with a reading mirror, and the emission end of the reading mirror is aligned with the receiver, and the ends of the first and second reference positioning fixtures and the third and fourth reference positioning fixtures corresponding to the optical component barrel to be measured are matched with the end face and axial direction of the optical component barrel to be measured as the positioning reference; the other ends of the third and fourth reference positioning fixtures are matched with the end face and axial direction of the reading mirror as the positioning reference, and the graticule of the reading mirror coincides with the focal plane of the photographic objective lens;

[0024] In a specific solution, the receiver includes a collimating lens 600, a CCD camera 700, and a display 800. A collimator is provided below the first and second reference positioning fixtures. The collimator generates a parallel light beam which passes through the first and second reference positioning fixtures, the lens barrel of the optical component to be measured, the third and fourth reference positioning fixtures, and the reading microscope, and finally passes through the collimating lens, and is captured by the CCD camera 700 and converted into an electrical signal. After being processed, the electrical signal is displayed on the display, and the operator can observe and analyze these images to obtain the measurement results. For example, the receiver can adopt an eccentricity meter.

[0025] During the implementation process, the first and second reference positioning fixtures are aligned and installed with the parallel light tube to ensure their stability. The two ends of the optical component barrel to be tested are respectively aligned with the first and second reference positioning fixtures and the third and fourth reference positioning fixtures. The third and fourth reference positioning fixtures are connected to the reading microscope to achieve accurate alignment of the two, ensuring that the center point of the reading microscope coincides with the focus of the objective lens to be tested.

[0026] S102: Rotate the lens barrel of the optical component to be tested and keep the reading microscope stationary, obtain the image information of the reading microscope graticule plate through the receiver, measure the jumping track size of the transmission eccentric imaging on the receiver relative to the reading microscope graticule plate, and use this as the transmission eccentricity value of the lens barrel of the optical component to be tested with the two end faces and the axial direction as the reference.

[0027] like Figure 5 As shown, the detection principle of this embodiment is: a beam of parallel light at an arbitrary angle to the AB axis enters the optical component to be tested, passes through the optical component to be tested and converges on the graticule. When the optical component to be tested is rotated with the AB axis as the axis, the focus of the optical component will rotate around the intersection of the main surface of the optical system and the rotation axis along the intersection of the ray starting from the direction of the incident parallel light and the focal plane of the optical component. At the same time, the CD axis (coinciding with the target surface of the CCD camera) will rotate around the AB axis. The final requirement is the size of the trajectory circle of the optical component focus relative to the CD axis. The size of the trajectory circle directly reflects the transmission eccentricity value of the four benchmarks of the optical component to be tested (such as Figure 6 He Ru Figure 7 Specific measurement diagram in ).

[0028] By achieving simultaneous positioning of four benchmarks, the measurement accuracy of transmission eccentricity is significantly improved, avoiding the limitations of traditional methods with only a single benchmark.

[0029] The receiver is an electronic collimator that only receives parallel light, and can receive and display the image of the graticule in the reading microscope and the focus image of the optical component to be measured.

[0030] The grating plate 900 of the reading microscope has grid-like engraved lines, and the accuracy of the grid is determined according to the eccentricity requirements of the optical component product. The higher the requirements, the higher the accuracy of the engraved lines.

[0031] Through the design of the grid-shaped graticule 900, the jumping trajectory of the transmission eccentricity can be read intuitively, and the data processing is concise and clear, which is convenient for subsequent analysis and recording, and provides convenience for quality control.

[0032] Embodiment 2: The first and second reference positioning fixtures are aligned with the first and second reference structures of the optical component to be tested, and can be mounted on the first and second references of the lens barrel of the optical component to be tested, with the other end aligned with the parallel light tube.

[0033] The third and fourth reference positioning fixtures are aligned with the third and fourth reference structures of the optical component to be measured, and the other end is aligned with the connection positioning reference of the reading mirror.

[0034] like Figure 1-4 As shown, the third and fourth reference positioning fixtures 100 are cylindrical structures and can be sleeved on the end of the optical component barrel 200 to be tested, and the outer ends thereof have supporting end surfaces that align with the outer peripheral flange of the optical component barrel 200 to be tested.

[0035] The third and fourth reference positioning fixtures 100 should be designed as a cylindrical structure, which can be mounted on the end of the optical component barrel 200 to be measured. Its inner diameter needs to match the outer diameter of the objective lens to be measured to ensure a stable clamping effect. The support end surface is used to ensure that the optical component barrel to be measured can effectively rotate along the central axis during the rotation process to avoid inaccurate measurement results due to eccentricity or tilt.

[0036] One end of the third and fourth reference positioning fixture 100 has a first socket 102 that matches with the lens barrel of the optical component to be measured, and the other end thereof has a second socket 101 that matches with the reading microscope, and the central axis of the first socket 101 and the second socket 102 are aligned. The central axis of the first socket 101 and the second socket 102 should be strictly aligned to ensure that there is no deviation in the optical path between the optical component to be measured and the reading microscope 400.

[0037] The outer peripheries of the third and fourth reference positioning fixtures 100 are respectively provided with first positioning surfaces that are aligned with the upper flanges of the optical component barrel 200 to be measured and the reading microscope 400.

[0038] The outer periphery of the first and second reference positioning fixtures 300 is provided with a third socket 301 which is aligned with the lens barrel 200 of the optical component to be tested, and the outer periphery of the first and second reference positioning fixtures 300 is provided with a circle of second positioning surfaces 302 which are aligned with the lower flange of the lens barrel of the optical component to be tested around the third socket 301.

[0039] The combination of the first, second and third, fourth reference positioning fixtures forms an integrated positioning system. The optical component to be measured is fixed by the first and second reference positioning fixtures 300, and the third and fourth reference positioning fixtures 100 ensure the accurate alignment of the reading mirror and the stability of the optical path during the rotation process.

[0040] The simple structure and easy-to-assemble fixture design reduce the skill requirements of the operator and make the operation process more intuitive and clear. The good alignment between the support end face and the flange ensures that there is no deviation during the rotation process, reducing the interference of external factors on the measurement results.

[0041] The technical means disclosed in the scheme of the present invention are not limited to the technical means disclosed in the above-mentioned implementation mode, but also include technical schemes composed of any combination of the above-mentioned technical features. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications are also regarded as the protection scope of the present invention.

Claims

1. A method for detecting transmission eccentricity of an optical component using four references, characterized in that: The following steps are involved: The two ends of the optical component barrel to be measured are respectively aligned and matched with the first and second reference positioning fixtures and the third and fourth reference positioning fixtures, wherein the other ends of the first and second reference positioning fixtures are aligned and installed with the parallel light tube, and the other ends of the third and fourth reference positioning fixtures are installed with a reading mirror, and the emission end of the reading mirror is aligned with the receiver, and the ends of the first and second reference positioning fixtures and the third and fourth reference positioning fixtures corresponding to the optical component barrel to be measured are matched with the end face and axial direction of the optical component barrel to be measured as the positioning reference; the other ends of the third and fourth reference positioning fixtures are matched with the end face and axial direction of the reading mirror as the positioning reference, and the graticule of the reading mirror coincides with the focal plane of the optical component; Rotate the lens barrel of the optical component to be tested and keep the reading microscope stationary, and obtain the image information of the reading microscope graticule through the receiver. The size of the jumping trajectory of the transmission eccentric imaging on the receiver relative to the reading microscope graticule is used as the transmission eccentricity value of the lens barrel of the optical component to be tested based on both end faces and the axial direction.

2. The method according to claim 1, characterized in that The graticule of the reading microscope is provided with grid-like lines, which serve as reference lines for evaluating the magnitude of the transmission eccentric imaging jitter.

3. The method according to claim 1 or 2, characterized in that: The receiver is an electronic collimator that only receives parallel light, and can receive and display the image of the graticule in the reading microscope and the focus image of the optical component to be measured.

4. The method according to claim 1, characterized in that: The first and second reference positioning fixtures are aligned with the first and second reference structures of the optical component to be tested, and can be sleeved on the first and second references of the lens barrel of the optical component to be tested, with the other end aligned with the parallel light tube.

5. The method according to claim 1, characterized in that The third and fourth reference positioning fixtures are aligned with the third and fourth reference structures of the optical component to be measured, and the other end is aligned with the connection positioning reference of the reading mirror.

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