Lens pressing ring structure, fundus camera and inclination angle confirmation method

Abstract

The invention discloses a lens clamping ring structure, a fundus camera and an inclination angle confirmation method, relates to the technical field of optical lenses and precision assembly, and discloses a lens clamping ring structure which comprises a first eyepiece lens, a second eyepiece lens and an eyepiece group space ring. The first eyepiece lens, the eyepiece group space ring and the second eyepiece lens are coaxially arranged from front to back in sequence; and the inner side of the eyepiece group space ring is provided with a dip angle for changing the light path of the reflection light spot. By adjusting the inclination of the interior of the lens space ring, the reverse light spots can be directionally reflected to other structure areas, the reverse light spots are prevented from entering an optical system, and the imaging quality of a photo CCD is improved.

Description

Technical Field

[0001] The present application relates to the field of optical lenses and precision assembly technology, and in particular to a lens pressing ring structure, a fundus camera and a tilt angle confirmation method. Background Art

[0002] Fundus cameras are inspection devices that collect fundus images of the human eye to determine whether there are lesions in the optic nerve, retina, choroid, and refractive media. Generally, during fundus camera shooting, the optical system illumination on the cornea will produce corneal reflection spots and reflect them into the light path. If these reflected lights are not blocked or eliminated, the final photos will have obvious reflection spots, making the local area image unclear. In severe cases, the local features of the fundus cannot be seen clearly, thus affecting the diagnosis of the photos by professionals. Therefore, during fundus camera shooting, suppressing corneal reflection imaging is a very important and urgent issue. Summary of the invention

[0003] The main purpose of the present application is to provide a lens pressing ring structure, a fundus camera and a tilt angle confirmation method, aiming to solve the technical problem in the prior art that the reflected light spot of the fundus camera enters the optical system and affects the imaging.

[0004] To achieve the above-mentioned purpose, the present application proposes a lens pressing ring structure, which includes: a first eyepiece lens, a second eyepiece lens and an eyepiece group spacer; the first eyepiece lens, the eyepiece group spacer and the second eyepiece lens are coaxially arranged in sequence from front to back; the eyepiece group spacer has an inclination angle arranged on the inner side for changing the optical path of the reflected light spot.

[0005] In one embodiment, the inclination angle is generated by machining the eyepiece assembly spacer, and the inclination angle is integrally formed with the eyepiece assembly spacer.

[0006] In one embodiment, the lens pressure ring structure also includes: an inclination auxiliary structure; the inclination auxiliary structure includes an inclined surface and a splicing surface; the inclination auxiliary structure is spliced ​​with the eyepiece group spacer through the splicing surface; the inclination auxiliary structure generates an inclination angle on the inner side of the eyepiece group spacer through the inclined surface.

[0007] In one embodiment, the inclination angle is in the range of 2 degrees to 30 degrees.

[0008] In addition, to achieve the above-mentioned purpose, the present application also proposes a fundus camera, which uses the lens pressing ring structure as described above.

[0009] In addition, to achieve the above-mentioned purpose, the present application also proposes a method for confirming an inclination angle, which is applied to the lens pressure ring structure as described above, and the method includes: obtaining a first reflection position after the reflection spot passes through the first eyepiece lens; confirming an initial reflection result based on the reflection position; and confirming the inclination angle of the eyepiece group spacer based on the initial reflection result and the optical path model.

[0010] In one embodiment, the step of confirming the inclination angle of the eyepiece group spacer based on the initial reflection result and the optical path model includes: inputting the reflection position into the optical path model; controlling the optical path model to adjust the inclination slope to obtain the inclination reflection result; and confirming the inclination angle of the eyepiece group spacer based on the inclination refraction result and the initial reflection result.

[0011] In one embodiment, the step of confirming the initial reflection result based on the reflection position also includes: building a light path model based on the lens pressure ring structure; obtaining the second reflection position of the reflection spot after passing through the first eyepiece lens in the light path model; and calibrating the light path model based on the first reflection position and the second reflection position.

[0012] In addition, to achieve the above-mentioned purpose, the present application also proposes a storage medium, which is a computer-readable storage medium, and a computer program is stored on the storage medium. When the computer program is executed by a processor, the steps of the tilt angle confirmation method described above are implemented.

[0013] In addition, to achieve the above-mentioned purpose, the present application also provides a computer program product, which includes a computer program, and when the computer program is executed by a processor, the steps of the tilt angle confirmation method described above are implemented.

[0014] One or more technical solutions proposed in this application have at least the following technical effects:

[0015] By finely adjusting the inclination design inside the lens spacer, the light reflection path can be precisely controlled. This structural change can ensure that the reflected light spots are reflected directionally to other non-sensitive structural areas of the optical system, thereby effectively preventing unnecessary reflected light spots from directly entering the imaging light path, significantly reducing the interference of reflected light such as stray light and glare on imaging. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0017] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0018] Figure 1 A vertical middle cross-sectional view without an inclination angle provided in Embodiment 1 of the lens pressing ring structure of the present application;

[0019] Figure 2 An inclined vertical middle cross-sectional view provided for the first embodiment of the lens pressing ring structure of the present application;

[0020] Figure 3 A brief flowchart of the tilt angle confirmation method provided in Example 2 of the present application.

[0021] Description of Figure Numbers:

[0022] Label illustrate Label illustrate 10 First eyepiece 30 Second eyepiece 20 Eyepiece spacer 40 Fastening ring 21 inclination 50 Lens tube

[0023] The purpose, features and advantages of this application will be further described in conjunction with the embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0024] It should be understood that the specific embodiments described herein are only used to explain the technical solutions of the present application and are not used to limit the present application.

[0025] In order to better understand the technical solution of the present application, a detailed description will be given below in conjunction with the accompanying drawings and specific implementation methods.

[0026] In the existing technology, as a precision ophthalmic medical device, the core function of fundus camera is to collect fundus images of human eyes non-invasively to evaluate the health of key eye structures such as optic nerve, retina, choroid and refractive medium in detail, and then determine whether there are signs of pathology. This technology plays a vital role in the early detection of glaucoma, diabetic retinopathy, macular degeneration and other ophthalmic diseases, providing ophthalmologists with valuable diagnostic basis.

[0027] In actual operation, the shooting process of the fundus camera requires extremely high image quality to ensure that every subtle fundus structure can be clearly captured. However, a common challenge is that when the optical system illuminates the cornea, reflected light spots are formed on the corneal surface, which are then captured by the camera along the light path and become interference elements in the image. If these corneal reflection spots are not properly processed, they will leave obvious traces on the final photo, causing the imaging of certain areas of the fundus to become blurred or even difficult to recognize. Especially when observing subtle structures or monitoring diseases, this reflection phenomenon may obscure important pathological features, making it difficult for doctors to make accurate diagnoses.

[0028] Therefore, in the design and use of fundus cameras, how to effectively suppress corneal reflective imaging has become an important and urgent issue. To achieve this goal, researchers and engineers have developed a variety of technical means, including but not limited to: using specially designed lighting sources and angles to reduce direct reflection of light on the cornea; using polarized light technology to eliminate reflected light in a specific direction by adjusting the polarization state of light; and applying image processing algorithms to automatically identify and remove reflected light spots in the post-processing stage of photos. The implementation of these measures has played a certain role, but there are challenges in the difficulty of development.

[0029] Based on this, in order to solve the technical problem in the prior art that the reflected light spot of the fundus camera enters the optical system and affects the imaging, this application proposes a lens pressing ring structure. Figure 1 and Figure 2 , Figure 1 This is a vertical middle cross-sectional view without an inclination angle provided in the first embodiment of the lens pressing ring structure of the present application. Figure 2 An inclined vertical middle cross-sectional view provided for the first embodiment of the lens pressing ring structure of the present application.

[0030] In this embodiment, the lens pressing ring structure includes: a first eyepiece lens 10, a second eyepiece lens 30 and an eyepiece lens group spacer 20. The first eyepiece lens 10, the eyepiece lens group spacer 20 and the second eyepiece lens 30 are coaxially arranged in sequence from front to back.

[0031] It should be noted that the first eyepiece lens 10 is the frontmost part of the entire structure, and is usually responsible for receiving the sight line or external light from the observer and directing it to the rear optical system.

[0032] It is understood that in order to obtain high-quality images, the first eyepiece lens 10 is usually precisely designed and manufactured to correct various aberrations, such as spherical aberration, coma and chromatic aberration. These correction measures help reduce image distortion, blur and color distortion. Further, in order to reduce the reflection loss of light on the lens surface, the first eyepiece lens 10 also needs to be anti-reflective or anti-reflective. These treatment measures include coating a multi-layer film on the lens surface to maximize the transmittance of light.

[0033] In addition, the first eyepiece lens 10 is generally exposed to the external environment, and can be made of high-hardness glass or plastic material, and undergo special surface treatment to enhance its scratch resistance, abrasion resistance and corrosion resistance, thereby improving durability and protective performance.

[0034] It should be noted that the eyepiece assembly spacer 20 is located between the first eyepiece lens and the second eyepiece lens, and its main function is to serve as a spacer to ensure that a certain distance is maintained between the two lenses, which is crucial to the performance of the entire optical system. The design of the spacer usually takes into account factors such as the focal length and aberration correction of the optical system to ensure the best imaging effect.

[0035] It should be noted that the size of the eyepiece assembly spacer 20 is usually determined according to the specific optical instrument and lens specifications. In this solution, its diameter, thickness and shape need to match the first eyepiece lens 10 and the second eyepiece lens 30 to ensure correct installation and positioning.

[0036] In addition, in order to maintain the stability and accuracy of the optical system, the eyepiece assembly spacer 20 is usually made of high-quality materials, such as metal or precision-machined plastic. These materials have good mechanical properties and stability, and can resist deformation and wear. This usually involves precision machining and detection technology.

[0037] It should be noted that the second eyepiece lens 30 is located at the last part of the entire structure, and further processes the light transmitted from the first eyepiece lens and the spacer, and finally focuses the light into the optical system to form a clear image.

[0038] It is understood that the second eyepiece lens 30 has a high manufacturing precision to ensure accurate matching with the entire optical system. Its surface finish, radius of curvature and thickness and other parameters are strictly tested and calibrated. In order to improve the imaging quality, the second eyepiece lens 30 is usually made of a material with high light transmittance, such as optical glass or special plastic. These materials can minimize the absorption and scattering of light, thereby improving the transmittance of light. The second eyepiece lens 30 is fixed in the lens barrel 50 by a fastening ring 40.

[0039] It can be understood that these three parts are arranged from front to back to form a complete and orderly optical system. This arrangement not only ensures the correct transmission of light, but also realizes the correction of aberrations and optimization of imaging quality through precise design and adjustment.

[0040] In a feasible implementation manner, the present application provides an inclination angle 21 on the inner side of the eyepiece assembly spacer 20 to change the optical path of the reflected light spot.

[0041] It can be understood that the inclination angle 21 is generated by processing the eyepiece group spacer 20. The inclination angle 21 is integrally formed with the eyepiece group spacer 20 and is the angle between the inner edge line of the eyepiece group spacer 20 and the horizontal line. Its main function is to adjust the optical path of the reflected light spot. In optical instruments, the transmission path of light is crucial to the image quality. By adjusting the inclination angle 21, the direction and position of the reflected light spot can be accurately controlled, thereby achieving more precise optical path adjustment and optimizing the image quality. For example, in a microscope or telescope, adjusting the optical path can reduce aberrations, improve resolution and contrast, and thus provide clearer and more accurate images.

[0042] Furthermore, in some cases, the reflected light spots may generate unnecessary interference or stray light. By setting the inclination angle 21, these reflected light spots can be directed to a position away from the observation area, thereby reducing interference and improving the observation effect. Figure 1 , Figure 1 It is given that when the inclination angle 21 is 0, the reflected light spot enters the lens barrel 50 along the center after reflection, and when the inclination angle 21 is a non-zero value, the reflected light spot enters the lens barrel, that is, the position of the optical system is below the center point.

[0043] It should be noted that the processing can be to generate the inclination angle 21 by cutting. Therefore, the material selection of the eyepiece group spacer 20 is crucial to the realization of the inclination angle 21. It is necessary to select a material with high hardness, high stability and high precision to ensure the accuracy and durability of the inclination angle 21. The manufacturing process of the inclination angle 21 focuses on precise control, including precise machining, polishing and testing steps to ensure the accuracy and consistency of the inclination angle 21.

[0044] Generally speaking, the material of the eyepiece assembly spacer 20 can be selected from commonly used metals such as stainless steel, aluminum alloy and brass, which have high strength, corrosion resistance and good mechanical properties. However, in certain cases, optical glass, ceramic materials or polymer materials can also be considered.

[0045] Furthermore, in order to improve the effect of the tilt angle 21, the tilt angle 21 can be made by splicing the tilt angle auxiliary structure and the eyepiece group spacer 20, so as to achieve different material combinations, thereby improving the accuracy of changing the optical path of the reflection spot.

[0046] In this embodiment, the lens pressing ring structure further includes: an inclination auxiliary structure; the inclination auxiliary structure includes an inclined surface and a splicing surface; the inclination auxiliary structure is spliced ​​with the eyepiece assembly spacer 20 through the splicing surface; the inclination auxiliary structure generates an inclination angle 21 inside the eyepiece assembly spacer through the inclined surface. The inclination angle 21 is the angle between the inclined surface of the inclination auxiliary structure and the horizontal line.

[0047] It should be noted that the inclined surface of the inclination auxiliary structure is a key part of the inclination auxiliary structure, which is responsible for generating the inclination angle 21 inside the eyepiece group spacer. The angle and shape of the inclined surface need to be precisely designed to ensure matching with other parts of the optical system, thereby achieving the required optical path adjustment.

[0048] It should be noted that the joint surface of the tilt assisting structure is the connection portion between the tilt assisting structure and the eyepiece assembly spacer 20, and it needs to have sufficient precision and flatness to ensure a close fit and stability between the tilt assisting structure and the eyepiece assembly spacer 20. Specifically, the joint surface can be connected by thread, snap or other reliable connection methods to ensure the firmness of the structure.

[0049] It is understandable that a combination of different materials can be selected according to specific needs to optimize the effect of the tilt angle 21. For example, a material with high hardness and wear resistance can be selected to make the tilt angle auxiliary structure of the eyepiece group spacer 20 to improve its durability; at the same time, a material with good reflective properties and stability can be selected to make the tilt angle auxiliary structure to ensure its accuracy and reliability.

[0050] In addition, by selecting different material combinations, costs can be reduced while ensuring performance. For example, a cheaper material can be used to make the eyepiece assembly spacer 20, while a more expensive material can be used to make the tilt assist structure. At the same time, the splicing design allows the tilt assist structure and the eyepiece assembly spacer 20 to be manufactured and processed separately, thereby simplifying the manufacturing process. If any part of the tilt assist structure or the eyepiece assembly spacer 20 is damaged or needs to be replaced, it can be replaced separately without replacing the entire assembly.

[0051] Furthermore, in a feasible implementation manner, the joint surface is provided with a connecting portion, and the inner side of the eyepiece assembly spacer is provided with a matching portion; the connecting portion and the matching portion are matched and installed to form a matching body.

[0052] It should be noted that the connecting part is a special structure arranged on the splicing surface, which is used to cooperate or connect with another component. The matching part is a structure arranged on the inner side of the eyepiece assembly spacer, which is used to cooperate or connect with the connecting part.

[0053] It should be noted that the connecting portion and the matching portion are matched or connected by some means such as thread, buckle, plug-in, etc., so as to form a whole or matching body. This matching body has an adjustable height feature, which means that its height can be changed by some mechanism such as knob, screw, etc. By adjusting the height of the matching body, the distance between the inclination angle and the axis of the eyepiece group spacer can be changed.

[0054] It is understandable that when the height of the matching body increases, the distance between the inclination angle and the axis of the eyepiece group spacer ring is shortened, which can better deviate the reflected light spot from the optical system, but there is also a risk of target light being reflected, so the height of the matching body needs to be determined through experiments to its appropriate range.

[0055] In addition, it should be noted that the angle of the inclination is in the range of 2 degrees to 30 degrees. The angle of the inclination 21 directly affects the optical path adjustment of the reflected light spot. A smaller angle may not be enough to significantly change the optical path, while a larger angle may cause excessive optical path deflection, thereby affecting the imaging quality. In the range of 2 degrees to 30 degrees, the inclination 21 can provide moderate optical path adjustment, which is neither too weak nor too drastic, thereby helping to optimize the imaging effect.

[0056] It is understandable that the larger the angle of the inclination angle 21, the greater the manufacturing difficulty. More precise processing and higher manufacturing precision are required to ensure the accuracy and consistency of the inclination angle. In the range of 2 to 30 degrees, the manufacturing difficulty is relatively moderate, which helps to control manufacturing costs and improve production efficiency. At the same time, within this angle range, the stability of the inclination angle 21 is relatively good, and it can resist certain external interference and temperature changes, thereby ensuring the stability and reliability of the optical system.

[0057] In addition, the lens pressing ring structure further includes: a fastening ring 40; the fastening ring 40 is coaxial with the second eyepiece lens and is disposed at the rear of the second eyepiece lens.

[0058] It should be noted that the fastening ring is placed at the rear of the second eyepiece lens, which means that it is located behind the second eyepiece lens in the light path. The main function of the fastening ring 40 is to provide additional support and fixation to ensure that the position of the second eyepiece lens in the optical system is stable and will not move due to vibration, temperature changes or other external factors.

[0059] It is understandable that the fastening ring 40 can also be set with an inclination angle on the inner side to adjust or fine-tune the light emitted from the second eyepiece lens to achieve more precise optical performance.

[0060] In this embodiment, by finely adjusting the inclination design inside the lens spacer, precise control of the light reflection path can be achieved. This structural change can ensure that the reflected light spot is reflected directionally to other non-sensitive structural areas of the optical system, thereby effectively preventing unnecessary reflected light spots from directly entering the imaging light path, and significantly reducing the interference of reflected light such as stray light and glare on imaging.

[0061] In addition, the present application also provides a fundus camera, which uses the lens pressing ring structure described above. Since the fundus camera adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0062] In addition, the present application also provides a method for confirming the inclination angle, which is convenient for more accurately confirming the inclination angles of the first eyepiece lens 10, the second eyepiece lens 30 and the eyepiece assembly spacer 20 of different models. Figure 3 , Figure 3 A schematic diagram of a simplified process of the tilt angle confirmation method provided in the second embodiment of the present application. In this embodiment, the method is applied to the lens pressing ring structure as described above, and the method includes steps S10 to S30.

[0063] Step S10, obtaining a first reflection position of the reflection spot after it passes through the first eyepiece lens.

[0064] It is understood that it is usually necessary to use a light source, such as a laser or LED light source, to generate a reflective spot and guide it to the surface of the first eyepiece lens 10. After the reflective spot is reflected on the first eyepiece lens 10, a light spot is formed at a certain position. This position is the so-called first reflective position. In order to accurately obtain this position, a high-resolution camera or photoelectric sensor can be used to capture and record it.

[0065] Step S20, confirming the initial reflection result based on the reflection position.

[0066] It is understandable that after obtaining the first reflection position, it needs to be processed and analyzed. This includes calculating the incident angle and reflection angle of the reflection spot on the first eyepiece lens 10, and evaluating the intensity and distribution of the reflection spot. This information will constitute the initial reflection result and provide key data for subsequent steps.

[0067] Step S30: confirming the inclination angle of the eyepiece assembly spacer based on the initial reflection result and the optical path model.

[0068] It is understood that the initial reflection results will be analyzed using the established optical path model. The optical path model is a mathematical model that describes the path of light in an optical system, which takes into account factors such as the refractive index, curvature, thickness of the lens, and the spacing between the lenses.

[0069] It should be noted that by inputting the initial reflection results including the incident angle, reflection angle, intensity and distribution of the reflection spot into the optical path model, the propagation path of the light between the first eyepiece lens 10 and the second eyepiece lens 30 can be simulated, as well as how the light is deflected by the inclination angle of the eyepiece assembly spacer 20.

[0070] Furthermore, by comparing the simulation results with the actual situation, such as the position of the reflected light spot obtained by measurement or observation, the parameters in the optical path model, such as the inclination angle of the eyepiece assembly spacer 20, can be continuously adjusted until the simulation results are highly consistent with the actual situation. At this point, the inclination angle of the eyepiece assembly spacer 20 can be confirmed.

[0071] In a feasible embodiment, the step of confirming the inclination angle of the eyepiece group spacer based on the initial reflection result and the optical path model includes: inputting the reflection position into the optical path model; controlling the optical path model to adjust the inclination slope to obtain the inclination reflection result; and confirming the inclination angle of the eyepiece group spacer based on the inclination refraction result and the initial reflection result.

[0072] Specifically, the first light reflection position obtained in step S10 is used as input data and imported into a pre-established light path model. The light path model is a mathematical or physical model used to describe the propagation path of light in an optical system.

[0073] Next, the light propagation paths at different inclination angles are simulated by adjusting the parameters in the optical path model, especially the parameters related to the inclination angle of the eyepiece group spacer, such as the inclination slope. This usually involves an iterative process, in which the optical path model automatically adjusts the inclination slope according to a preset algorithm or rule and calculates the corresponding light propagation path.

[0074] After each adjustment of the inclination angle, the optical path model will output the corresponding inclination reflection results. These results may include information such as the position, intensity, and direction of the reflected light, which will be used to compare with the initial reflection results.

[0075] Finally, by comparing the dip reflection result with the initial reflection result, i.e., the reflection result confirmed in step S20, the dip angle that best matches the actual situation can be found. This usually involves an optimization process, in which the dip angle is continuously adjusted until the difference between the dip reflection result and the initial reflection result is minimized or meets the preset accuracy requirements.

[0076] In a feasible implementation, the step of confirming the initial reflection result based on the reflection position also includes: building a light path model based on the lens pressure ring structure; obtaining the second reflection position of the reflection spot after passing through the first eyepiece lens in the light path model; and calibrating the light path model based on the first reflection position and the second reflection position.

[0077] Specifically, according to the actual parameters of the lens ring structure (such as the size, curvature, refractive index of the lens, and the inclination angle of the eyepiece group spacer, etc.), an accurate optical path model is built. This model will be used to simulate the propagation path of light in the lens ring structure.

[0078] After the optical path model is built, use the same light source and reflective spot as in actual operation to simulate its reflection process on the first eyepiece. Record the position of the reflective spot after passing through the first eyepiece in the optical path model, that is, the second reflective position. This position is the result predicted by the optical path model and will be used to compare with the first reflective position in actual operation.

[0079] Compare the first reflection position (obtained in actual operation) and the second reflection position (predicted by the optical path model) and analyze the difference between the two. If the difference is large, it means that the optical path model needs to be calibrated. By adjusting the parameters in the optical path model (such as the refractive index and curvature of the lens, or the inclination of the eyepiece group spacer, etc.), make the second reflection position as close to or consistent with the first reflection position as possible. This process may require multiple iterations and adjustments until a satisfactory calibration result is achieved.

[0080] In this embodiment, a method is provided for more accurately confirming the inclination angle of the first eyepiece lens 10, the second eyepiece lens 30 and the eyepiece lens assembly spacer 20 of different models. Through the measurement and comparison of the accurate optical path model and the reflection position, the high-precision confirmation of the lens inclination angle can be achieved. The method is applicable to different models of the first eyepiece lens 10, the second eyepiece lens 30 and the eyepiece lens assembly spacer 20, and has strong versatility and applicability. The reliability and accuracy of the confirmation result are further ensured through the iterative process of calibrating the optical path model and confirming the inclination angle.

[0081] The present application provides a computer-readable storage medium having computer-readable program instructions (ie, computer programs) stored thereon, and the computer-readable program instructions are used to execute the tilt angle confirmation method in the above-mentioned embodiment.

[0082] The computer-readable storage medium provided in the present application may be, for example, a USB flash drive, but is not limited to electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, systems or devices, or any combination of the above. More specific examples of computer-readable storage media may include, but are not limited to: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In this embodiment, the computer-readable storage medium may be any tangible medium containing or storing a program that can be used by or in combination with an instruction execution system, system or device. The program code contained on the computer-readable storage medium may be transmitted using any appropriate medium, including but not limited to: wires, optical cables, RF (Radio Frequency), etc., or any suitable combination of the above.

[0083] Computer program code for performing the operations of the present application may be written in one or more programming languages ​​or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, C++, and conventional procedural programming languages ​​such as "C" or similar programming languages. The program code may be executed entirely on the user's computer, partially on the user's computer, as a separate software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0084] The flow chart and block diagram in the accompanying drawings illustrate the possible architecture, function and operation of the system, method and computer program product according to various embodiments of the present application. In this regard, each square box in the flow chart or block diagram can represent a module, a program segment or a part of a code, and the module, the program segment or a part of the code contains one or more executable instructions for realizing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the square box can also occur in a sequence different from that marked in the accompanying drawings. For example, two square boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each square box in the block diagram and / or flow chart, and the combination of the square boxes in the block diagram and / or flow chart can be implemented with a dedicated hardware-based system that performs a specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions.

[0085] The modules involved in the embodiments described in this application may be implemented by software or hardware, wherein the name of the module does not constitute a limitation on the unit itself in some cases.

[0086] The readable storage medium provided by the present application is a computer-readable storage medium, which stores computer-readable program instructions (i.e., computer programs) for executing the above-mentioned tilt angle confirmation method, and can solve the technical problem in the prior art that the reflected light spot of the fundus camera enters the optical system and affects the imaging. Compared with the prior art, the beneficial effects of the computer-readable storage medium provided by the present application are the same as the beneficial effects of the tilt angle confirmation method provided by the above-mentioned embodiment, and will not be repeated here.

[0087] The present application also provides a computer program product, including a computer program, which implements the steps of the above-mentioned tilt angle confirmation method when executed by a processor.

[0088] The computer program product provided by the present application can solve the technical problem in the prior art that the reflected light spot of the fundus camera enters the optical system and affects the imaging. Compared with the prior art, the beneficial effects of the computer program product provided by the present application are the same as the beneficial effects of the tilt angle confirmation method provided by the above embodiment, which will not be described in detail here.

[0089] The above descriptions are only some embodiments of the present application, and are not intended to limit the patent scope of the present application. All equivalent structural changes made using the contents of the present application specification and drawings under the technical concept of the present application, or direct / indirect applications in other related technical fields are included in the patent protection scope of the present application.

Claims

1. A lens pressing ring structure, characterized in that: The lens pressing ring structure comprises: a first eyepiece lens, a second eyepiece lens and an eyepiece lens assembly spacer; The first eyepiece lens, the eyepiece lens assembly spacer and the second eyepiece lens are coaxially arranged in sequence from front to back; The eyepiece assembly spacer has an inner side provided with an inclination angle for changing the optical path of the reflected light spot.

2. The lens pressing ring structure according to claim 1, characterized in that: The inclination angle is generated by machining the eyepiece assembly spacer, and the inclination angle is integrally formed with the eyepiece assembly spacer.

3. The lens pressing ring structure according to claim 1, characterized in that: The lens pressing ring structure further includes: an inclination auxiliary structure; The tilt auxiliary structure includes an inclined surface and a splicing surface; The tilt auxiliary structure is spliced ​​with the eyepiece assembly spacer through the splicing surface; The tilt angle auxiliary structure generates a tilt angle of the inner side of the eyepiece group spacer through the inclined surface.

4. The lens pressing ring structure according to any one of claims 1 to 3, characterized in that: The inclination angle is in the range of 2 degrees to 30 degrees.

5. A fundus camera, characterized in that: The fundus camera uses the lens pressing ring structure as described in any one of claims 1 to 4.

6. A method for confirming an inclination angle, characterized in that: The method is applied to the lens pressing ring structure according to any one of claims 1 to 4, and the method comprises: Acquire a first reflection position after the reflection spot passes through the first eyepiece lens; confirming an initial reflection result based on the reflection position; Based on the initial reflection result and the optical path model, the inclination angle of the eyepiece group spacer is confirmed.

7. The inclination confirmation method according to claim 6, characterized in that: The step of determining the inclination angle of the eyepiece assembly spacer based on the initial reflection result and the optical path model comprises: Inputting the reflection position into the light path model; Controlling the optical path model to adjust the inclination angle and obtain the inclination reflection result; The inclination angle of the eyepiece group spacer is confirmed based on the inclination refraction result and the initial reflection result.

8. The inclination confirmation method according to claim 7, characterized in that: Before the step of confirming the initial reflection result based on the reflection position, the step further includes: Build an optical path model based on the lens pressure ring structure; Acquire a second reflection position of the reflection spot after the reflection spot passes through the first eyepiece lens in the optical path model; The light path model is calibrated based on the first light reflecting position and the second light reflecting position.

9. A storage medium, characterized in that: The storage medium is a computer-readable storage medium, and a computer program is stored on the storage medium. When the computer program is executed by a processor, the steps of the tilt angle confirmation method according to any one of claims 6 to 8 are implemented.

10. A computer program product, characterized in that The computer program product comprises a computer program, and when the computer program is executed by a processor, the steps of the tilt angle confirmation method according to any one of claims 6 to 8 are implemented.

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