A method for detecting transmission eccentricity of optical components using four references

Abstract

This invention relates to the field of optical inspection equipment technology, specifically to a method for detecting transmission eccentricity in optical components using four reference points. The inspection fixture and process designed in this application fully simulate the actual use scenario of optical component products with four reference points for connection and positioning, making the inspection results more practically valuable. This method not only improves the reliability of the inspection but also enhances the fit between product design and actual customer needs. Through the improved inspection scheme, imaging blur and distortion caused by transmission eccentricity can be effectively eliminated, improving the overall imaging clarity and accuracy.

Description

Technical Field

[0001] This invention relates to the field of optical testing technology, and specifically to a method for measuring the transmission eccentricity of a product under test using four references in optical components. Background Technology

[0002] In modern microscopy, stereomicroscopes are widely used for high-precision observation and imaging of minute objects. Their working principle involves converting light from the target into parallel light through the objective lens and steering system. This parallel light is then focused onto the target surface of the CCD camera via the photographic objective lens, forming a clear, magnified image on the screen. The photographic objective lens connects to both the front-end optical system and the CCD camera, thus providing four connection and positioning references at both ends. Maintaining the consistency between the binocular and triocular centers is crucial to ensuring the imaging quality of the microscope system. Any optical path deviation will directly affect the clarity and accuracy of the image, leading to unreliable observation results.

[0003] In the process of eccentricity detection, traditional methods mainly use the connection reference (reference AB) of the microscope main unit as the basis for eccentricity detection. Past experience has shown that ignoring the reference (reference CD) connected to the CCD camera may lead to ineffective detection of eccentricity, thus affecting product quality. For example, in early tests, the failure to consider multiple reference points for simultaneous detection resulted in eccentricity problems in actual use of the equipment.

[0004] Therefore, comprehensive detection of transmission eccentricity by considering multiple reference points (such as ABCD) is particularly important. This discovery has spurred research and development in related technologies aimed at improving the imaging quality and reliability of microscopes and similar products to meet the growing demand for precision measurements. Summary of the Invention

[0005] To address the aforementioned problems, this invention discloses a method for detecting four-reference transmission eccentricity in optical components, comprising the following steps:

[0006] The two ends of the lens barrel of the optical component under test are aligned and fitted with the first and second reference positioning fixtures and the third and fourth reference positioning fixtures, respectively. The other ends of the first and second reference positioning fixtures are aligned and installed with the collimator. The other ends of the third and fourth reference positioning fixtures are fitted with a reading lens, which is aligned with the receiver. The ends of the first and second reference positioning fixtures and the third and fourth reference positioning fixtures corresponding to the lens barrel of the optical component under test are fitted with the end face and axis of the lens barrel of the optical component under test as positioning references. The other ends of the third and fourth reference positioning fixtures are fitted with the end face and axis of the reading lens as positioning references, and the reticle of the reading lens coincides with the focal plane of the optical component.

[0007] Rotate the lens barrel of the optical component under test while keeping the reading reticle stationary. Acquire the image information of the reading reticle reticle reticle through the receiver. The magnitude of the jump trajectory of the transmission eccentric image relative to the reading reticle reticle on the receiver display is used as the transmission eccentricity value of the lens barrel of the optical component under test with the end face and axis as references simultaneously.

[0008] The reticle of the reading microscope has grid-like lines, which serve as reference lines for evaluating the magnitude of transmission eccentricity imaging jitter.

[0009] The receiver is an electronic collimator that only accepts parallel light, and can receive the reticle image of the reading microscope and the focal image of the optical component under test.

[0010] The first and second reference positioning fixtures are structurally aligned with the first and second references of the optical component under test, and can be fitted onto the first and second references of the lens barrel of the optical component under test, with the other end aligned with the collimator.

[0011] The third and fourth reference positioning fixtures are aligned and fitted according to the structure of the third and fourth references of the optical component under test, and the other end is aligned and fitted with the connection positioning reference of the reading lens.

[0012] The testing fixture and process designed in this application fully simulate the actual use scenario of optical component products with four reference points for positioning, making the testing results more practically valuable. This method not only improves the reliability of testing but also enhances the fit between product design and actual customer needs. Through the improved testing scheme, imaging blurring and distortion caused by transmission eccentricity can be effectively eliminated, improving the overall imaging clarity and accuracy. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of the lens barrel of the optical component under test in an embodiment of this application;

[0014] Figure 2 This is a schematic diagram showing the cooperation between the lens barrel of the optical component under test and the first, second, third, and fourth reference positioning fixtures in the embodiments of this application;

[0015] Figure 3 These are schematic diagrams of the third and fourth reference positioning fixtures in the embodiments of this application;

[0016] Figure 4 This is a schematic diagram of the structure of the first and second reference positioning fixtures in the embodiments of this application.

[0017] Figure 5 This is a schematic diagram of the detection principle in the embodiments of this application;

[0018] Figure 6 The images shown are physical representations of objects used in the embodiments of this application.

[0019] Figure 7 This is a schematic diagram of the actual measurement results in the embodiments of this application. Detailed Implementation

[0020] To make the objectives, features, and advantages of this invention more apparent and understandable, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention. The principles and features of this invention are described below with reference to the accompanying drawings. The examples given are only for explaining this invention and are not intended to limit the scope of this invention.

[0021] The term "comprising" and other similar expressions used in the specification, claims, and accompanying drawings of this invention are intended to cover a non-exclusive inclusion, such as a process, method, system, or apparatus that includes a series of steps or units but is not limited to the steps or units listed.

[0022] Example 1: A method for measuring the transmission eccentricity of a product under test using four references in optical components, comprising the following steps:

[0023] S101: (e.g.) Figure 2 (As shown in the installation diagram) The two ends of the lens barrel of the optical component under test are aligned and fitted with the first and second reference positioning fixtures and the third and fourth reference positioning fixtures, respectively. The other ends of the first and second reference positioning fixtures are aligned and installed with the collimator. The other ends of the third and fourth reference positioning fixtures are fitted with a reading lens. The exit end of the reading lens is aligned with the receiver. The ends of the first and second reference positioning fixtures and the third and fourth reference positioning fixtures corresponding to the lens barrel of the optical component under test are fitted with the end face and axis of the lens barrel of the optical component under test as positioning references. The other end of the third and fourth reference positioning fixtures is fitted with the end face and axis of the reading lens as positioning references, and the reticle of the reading lens coincides with the focal plane of the photographic objective lens.

[0024] In the specific design, the receiver comprises a collimating objective lens 600, a CCD camera 700, and a display 800. A collimator is positioned below the first and second reference positioning fixtures. The collimator generates parallel beams that pass through the first and second reference positioning fixtures, the lens barrel of the optical component under test, the third and fourth reference positioning fixtures, and the reading lens, finally passing through the collimating objective lens. The beams are captured by the CCD camera 700 and converted into electrical signals. After processing, the electrical signals are displayed on the display, allowing the operator to observe and analyze these images to obtain measurement results. For example, an eccentric meter can be used as the receiver.

[0025] During the implementation process, the first and second reference positioning fixtures are aligned and installed with the collimator to ensure stability. The two ends of the lens barrel of the optical component under test are aligned and fitted with the first and second reference positioning fixtures and the third and fourth reference positioning fixtures, respectively. The third and fourth reference positioning fixtures are connected to the reading mirror to achieve precise alignment between the two and ensure that the center point of the reading mirror coincides with the focal point of the objective lens under test.

[0026] S102: Rotate the lens barrel of the optical component under test and keep the reading reticle stationary. Obtain the image information of the reading reticle reticle reticle through the receiver. Measure the size of the jump trajectory of the transmission eccentric image on the receiver relative to the reading reticle reticle reticle. Use this as the transmission eccentricity value of the lens barrel of the optical component under test with both end faces and the axis as references.

[0027] like Figure 5 As shown, the detection principle of this embodiment is as follows: A beam of parallel light at an arbitrary angle to the AB axis enters the optical component under test, converges on the reticle after passing through the optical component, and rotates the optical component under test about the AB axis. The focal point of the optical component rotates around the intersection of the principal plane of the optical system and the rotation axis, along the direction of the incident parallel light, and the intersection of the focal plane of the optical component. At the same time, the CD axis (coinciding with the target surface of the CCD camera) rotates around the AB axis. The final requirement is the size of the circle of motion of the focal point of the optical component relative to the CD axis. The size of this circle of motion directly reflects the transmission eccentricity value of the four references of the optical component under test (e.g., ...). Figure 6 He Ru Figure 7 (Specific measurement diagram in the diagram).

[0028] By achieving simultaneous positioning of four references, the measurement accuracy of transmission eccentricity is significantly improved, avoiding the limitations of traditional methods that rely on only a single reference.

[0029] The receiver is an electronic collimator that only accepts parallel light, and can receive and display the image of the reticle in the reading lens and the focal image of the optical component under test.

[0030] The reticle 900 of the reading lens has grid-like lines, and the precision of the grid depends on the eccentricity requirements of the optical component product. The higher the requirements, the higher the precision of the lines.

[0031] The design of the grid-like reticle 900 allows for intuitive reading of the trajectory of transmission eccentricity, making data processing simple and clear, facilitating subsequent analysis and recording, and providing convenience for quality control.

[0032] Example 2: The first and second reference positioning fixtures are structurally aligned with the first and second references of the optical component under test, and can be fitted onto the first and second references of the lens barrel of the optical component under test, with the other end aligned with the collimator.

[0033] The third and fourth reference positioning fixtures are structurally aligned with the third and fourth references of the optical component under test, and the other end is aligned with the connection positioning reference of the reading lens.

[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 lens barrel 200 of the optical component under test, and their outer ends have a support end face that aligns with the outer peripheral flange of the lens barrel 200 of the optical component under test.

[0035] The third and fourth reference positioning fixtures 100 should be designed as cylindrical structures that can be fitted onto the end of the lens barrel 200 of the optical component under test. Their inner diameter must match the outer diameter of the objective lens under test to ensure a secure clamping effect. The support end face is used to ensure that the lens barrel of the optical component under test can effectively rotate along the central axis during rotation, avoiding inaccurate measurement results due to eccentricity or tilt.

[0036] The third and fourth reference positioning fixtures 100 have a first insertion hole 102 at one end that aligns with the lens barrel of the optical component under test, and a second insertion hole 101 at the other end that aligns with the reading mirror. The central axes of the first insertion hole 101 and the second insertion hole 102 are aligned. The central axes of the first insertion hole 101 and the second insertion hole 102 should be strictly aligned to ensure that there is no deviation in the optical path between the optical component under test and the reading mirror 400.

[0037] The outer periphery of the third and fourth reference positioning fixtures 100 are respectively provided with a first positioning surface that aligns with the upper flange of the lens barrel 200 of the optical component under test and the reading lens 400.

[0038] The first and second reference positioning fixtures 300 are provided with a third insertion hole 301 on their outer periphery to align with the lens barrel 200 of the optical component under test, and the first and second reference positioning fixtures 300 are provided with a second positioning surface 302 around the third insertion hole 301 to align with the lower flange of the lens barrel of the optical component under test.

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

[0040] The simple and easy-to-assemble fixture design reduces the skill requirements for operators, making the operation process more intuitive and clear. The precise alignment of the support end face and the flange ensures no misalignment during rotation, reducing interference from external factors on the measurement results.

[0041] The technical means disclosed in this invention are not limited to those disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of this invention, and these improvements and modifications are also considered within the scope of protection of this invention.

Claims

1. A method for detecting transmission eccentricity of an optical component using four references, characterized in that, It comprises the following steps: The two ends of the optical assembly barrel to be tested are respectively matched with the first and second reference positioning jigs and the third and fourth reference positioning jigs, wherein the other ends of the first and second reference positioning jigs are aligned with the collimator, the other ends of the third and fourth reference positioning jigs are provided with reading eyepieces, the exit ends of the reading eyepieces are aligned with the receiver, the first and second reference positioning jigs and the third and fourth reference positioning jigs are matched with the corresponding ends of the optical assembly barrel to be tested, and the end faces and axial directions of the optical assembly barrel to be tested are used as positioning reference; the other ends of the third and fourth reference positioning jigs are matched with the end faces and axial directions of the reading eyepieces, and the scale plate of the reading eyepiece is overlapped with the focal plane of the optical assembly; The optical assembly barrel to be tested is rotated, and the reading eyepiece is kept stationary, the image information of the scale plate of the reading eyepiece is acquired through the receiver, and the size of the jumping track of the transmission eccentric imaging relative to the scale plate of the reading eyepiece on the receiver is used as the transmission eccentricity of the optical assembly barrel to be tested with the end faces and axial directions as the reference; The receiver is an electronic collimator that only accepts parallel light, and can receive and display the image of the scale plate in the reading eyepiece and the focal point image of the optical assembly to be tested; the first and second reference positioning jigs are matched with the structures of the first and second references of the optical assembly to be tested, can be sleeved on the first and second references of the optical assembly barrel to be tested, and the other ends thereof are aligned with the collimator; the outer periphery of the first and second reference positioning jigs is provided with a third insertion hole matched with the optical assembly barrel to be tested, and a second positioning surface matched with the lower flange of the optical assembly barrel to be tested is arranged around the third insertion hole; The third and fourth reference positioning jigs are matched with the structures of the third and fourth references of the optical assembly to be tested, and the other ends thereof are matched with the connecting positioning reference of the reading eyepiece; the third and fourth reference positioning jigs are in a cylindrical structure, can be sleeved on the end portion of the optical assembly barrel to be tested, and the outer end thereof has a supporting end surface matched with the outer peripheral flange of the optical assembly barrel to be tested; the outer periphery of the third and fourth reference positioning jigs is further provided with a first positioning surface matched with the upper flange of the reading eyepiece.

2. The method of claim 1, wherein, The scale plate of the reading eyepiece has grid-shaped engraved lines as reference lines for evaluating the jumping size of the transmission eccentric imaging.

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