Lens pressing ring structure and fundus camera

Abstract

The utility model discloses a lens clamping ring structure and a fundus camera, 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] This application relates to the field of optical lens and precision assembly technology, and in particular to lens retainer structure and fundus camera. Background Technology

[0002] A fundus camera is an examination device that captures images of the fundus of the eye to determine if there are any lesions in the optic nerve, retina, choroid, and refractive media. During fundus camera imaging, the optical system illumination produces corneal reflections that are reflected into the light path. If these reflections are not blocked or eliminated, the final image will have obvious reflections, resulting in unclear images of local areas. In severe cases, local features of the fundus may be obscured, affecting the professional's diagnostic ability. Therefore, suppressing corneal reflections during fundus camera imaging is a crucial and urgent issue. Utility Model Content

[0003] The main purpose of this application is to provide a lens retainer structure and a fundus camera, which aims to solve the technical problem in the prior art where reflected light spots from fundus cameras enter the optical system and affect imaging.

[0004] To achieve the above objectives, this application proposes a lens retainer 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 arranged coaxially from front to back; the eyepiece group spacer has an inclination angle on its inner side to change the optical path of the reflected light spot.

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

[0006] In one embodiment, the lens retaining ring structure further includes: a tilting auxiliary structure; the tilting auxiliary structure includes an inclined surface and a splicing surface; the tilting auxiliary structure is spliced ​​with the eyepiece assembly spacer ring through the splicing surface; the tilt angle is the angle between the inclined surface of the tilting auxiliary structure and the horizontal line.

[0007] In one embodiment, the splicing surface is provided with a connecting portion, and the inner side of the eyepiece assembly spacer is provided with a mating portion; the connecting portion and the mating portion are fitted together to form a mating body; the height of the mating body is adjustable to change the distance between the tilt angle and the axis of the eyepiece assembly spacer.

[0008] In one embodiment, the tilt angle is in the range of 2 to 30 degrees.

[0009] In one embodiment, the lens retaining ring structure further includes a fastening ring; the fastening ring is coaxial with the second eyepiece and is disposed at the rear of the second eyepiece.

[0010] In addition, to achieve the above objectives, this application also proposes a fundus camera that uses the lens retainer structure described above.

[0011] One or more technical solutions proposed in this application have at least the following technical effects:

[0012] By precisely adjusting the angle design inside the lens spacer, accurate control of the light reflection path can be achieved. This structural change ensures that the reflected spot is directionally reflected to other non-sensitive structural areas of the optical system, thereby effectively preventing unnecessary reflected spots from directly entering the imaging optical path and significantly reducing the interference of stray light and glare on imaging. Attached Figure Description

[0013] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0014] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a vertical mid-section view without tilt angle provided for Embodiment 1 of the lens retaining ring structure of this application;

[0016] Figure 2 This is a tilted vertical mid-section view provided for Embodiment 1 of the lens retainer structure of this application.

[0017] Explanation of icon numbers:

[0018]

[0019]

[0020] The purpose, features, and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0021] It should be understood that the specific embodiments described herein are merely illustrative of the technical solutions of this application and are not intended to limit this application.

[0022] To better understand the technical solution of this application, a detailed description will be provided below in conjunction with the accompanying drawings and specific implementation methods.

[0023] In existing technologies, fundus cameras, as sophisticated ophthalmic medical devices, primarily function to non-invasively acquire images of the fundus of the human eye to comprehensively assess the health of key ocular structures such as the optic nerve, retina, choroid, and refractive media, thereby determining the presence of any signs of disease. This technology plays a crucial role in the early detection of various ophthalmic diseases, including glaucoma, diabetic retinopathy, and macular degeneration, providing ophthalmologists with invaluable diagnostic information.

[0024] In practice, the imaging process of fundus cameras requires extremely high image quality to ensure that every subtle fundus structure is clearly captured. However, a common challenge is that when the optical system illuminates the cornea, reflective spots are formed on the corneal surface. These spots are subsequently captured by the camera along the light path, becoming interfering elements in the image. If these corneal reflective spots are not properly handled, they will leave noticeable marks on the final photograph, causing certain areas of the fundus to become blurred or even unrecognizable. Especially when observing fine structures or monitoring disease conditions, this reflection phenomenon can obscure important pathological features, making it difficult for doctors to make accurate diagnoses.

[0025] Therefore, effectively suppressing corneal reflection has become an important and urgent issue in the design and use of fundus cameras. To achieve this goal, researchers and engineers have developed various techniques, including but not limited to: employing specially designed illumination sources and angles to reduce direct reflection of light onto the cornea; utilizing polarized light technology to eliminate reflected light from specific directions by adjusting the polarization state of the light; and applying image processing algorithms to automatically identify and remove reflected light spots during post-processing. While these measures have all been effective, their development has presented significant challenges.

[0026] Based on this, in order to solve the technical problem in the prior art where reflected light spots from fundus cameras enter the optical system and affect imaging, this application proposes a lens retainer structure. Please refer to... Figure 1 and Figure 2 , Figure 1 This is a vertical mid-section view without tilt angle provided in Embodiment 1 of the lens retaining ring structure of this application. Figure 2 This is a tilted vertical mid-section view provided for Embodiment 1 of the lens retainer structure of this application.

[0027] In this embodiment, the lens retaining ring structure includes: a first eyepiece lens 10, a second eyepiece lens 30, and an eyepiece group spacer 20. The first eyepiece lens 10, the eyepiece group spacer 20, and the second eyepiece lens 30 are arranged coaxially from front to back.

[0028] It should be noted that the first eyepiece 10 is the foremost part of the entire structure, and is usually responsible for receiving the observer's line of sight or external light and guiding it to the optical system behind.

[0029] Understandably, to obtain high-quality images, the first eyepiece 10 is typically meticulously designed and manufactured to correct various aberrations, such as spherical aberration, coma, and chromatic aberration. These corrections help reduce image distortion, blurring, and color misalignment. Furthermore, to reduce light reflection loss at the lens surface, the first eyepiece 10 also requires anti-reflective or anti-reflective treatments. These treatments include coating the lens surface with multiple thin films to maximize light transmittance.

[0030] In addition, the first eyepiece 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, wear resistance and corrosion resistance, thereby improving its durability and protective performance.

[0031] It should be noted that the eyepiece spacer 20, located between the first and second eyepiece lenses, primarily functions as a spacer to ensure a certain distance is maintained between the two lenses. This distance is crucial to the performance of the entire optical system. The design of the spacer typically takes into account factors such as the focal length and aberration correction of the optical system to ensure optimal imaging results.

[0032] It should be noted that the size of the eyepiece spacer 20 is usually determined based on the specific optical instrument and lens specifications. In this design, 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.

[0033] In addition, to maintain the stability and accuracy of the optical system, the eyepiece spacer 20 is typically made of high-quality materials, such as metal or precision-machined plastic. These materials possess good mechanical properties and stability, resisting deformation and wear. This usually involves precision machining and inspection techniques.

[0034] It should be noted that the second eyepiece 30, located at the very end of the entire structure, further processes the light transmitted from the first eyepiece and the spacer, ultimately focusing the light onto the optical system to form a clear image.

[0035] Understandably, the second eyepiece 30 is manufactured with high precision to ensure accurate fit with the entire optical system. Its surface finish, radius of curvature, and thickness are all rigorously tested and calibrated. To improve image quality, the second eyepiece 30 is typically made of highly transparent materials, such as optical glass or special plastics. These materials minimize light absorption and scattering, thereby increasing light transmittance. The second eyepiece 30 is secured to the lens barrel 50 by a fastening ring 40.

[0036] Understandably, these three parts are arranged sequentially from front to back, forming a complete and orderly optical system. This arrangement not only ensures the correct transmission of light, but also, through precise design and adjustment, achieves aberration correction and optimization of image quality.

[0037] In one feasible implementation, 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.

[0038] It is understood that the tilt angle 21 is generated by machining the eyepiece assembly spacer 20. The tilt angle 21 is integrally formed with the eyepiece assembly spacer 20 and is the angle between the inner edge line of the eyepiece assembly spacer 20 and the horizontal line. Its main function is to adjust the optical path of the reflected light spot. In optical instruments, the light transmission path is crucial to image quality. By adjusting the tilt angle 21, the direction and position of the reflected light spot can be precisely controlled, thereby achieving more precise optical path adjustment and optimizing image quality. For example, in microscopes or telescopes, adjusting the optical path can reduce aberrations, improve resolution and contrast, thus providing a clearer and more accurate image.

[0039] Furthermore, in some cases, reflected light spots may produce unwanted interference or stray light. By setting the tilt angle 21, these reflected light spots can be guided to a position away from the observation area, thereby reducing interference and improving the observation effect. Please refer to... Figure 1 , Figure 1 It is shown that when the tilt angle 21 is 0, the reflected light spot enters the lens tube 50 along the center after reflection, while when the tilt angle 21 is a non-zero value, the reflected light spot enters the lens tube, that is, the position of the optical system is below the center point.

[0040] It should be noted that the aforementioned processing can generate the tilt angle 21 through cutting. Therefore, the material selection for the eyepiece assembly spacer 20 is crucial for achieving the tilt angle 21. A material with high hardness, high stability, and high precision needs to be selected to ensure the accuracy and durability of the tilt angle 21. The manufacturing process of the tilt angle 21 focuses on precise control, including precise machining, polishing, and inspection steps to ensure the accuracy and consistency of the tilt angle 21.

[0041] Generally, the eyepiece spacer 20 can be made of commonly used metals such as stainless steel, aluminum alloy, and brass, which possess high strength, corrosion resistance, and good mechanical properties. However, in specific cases, optical glass, ceramic materials, or polymer materials may also be considered.

[0042] Furthermore, in order to improve the effect of tilt angle 21, tilt angle 21 can be made by splicing tilt angle auxiliary structure and eyepiece assembly spacer 20 to achieve different material combinations, thereby improving the accuracy of changing the optical path of the reflective spot.

[0043] In this embodiment, the lens retaining ring structure further includes: a tilting auxiliary structure; the tilting auxiliary structure includes an inclined surface and a splicing surface; the tilting auxiliary structure is spliced ​​with the eyepiece assembly spacer 20 through the splicing surface; the tilting auxiliary structure generates a tilting angle 21 on the inner side of the eyepiece assembly spacer through the inclined surface, and the tilting angle 21 is the angle between the inclined surface of the tilting auxiliary structure and the horizontal line.

[0044] It should be noted that the bevel of the tilt-assist structure is a key component, responsible for generating the tilt angle 21 inside the eyepiece group spacer. The angle and shape of the bevel need to be precisely designed to ensure compatibility with the rest of the optical system, thereby achieving the required optical path adjustment.

[0045] It should be noted that the splicing surface of the tilting auxiliary structure is the connection between the tilting auxiliary structure and the eyepiece assembly spacer 20. It needs to have sufficient precision and flatness to ensure a tight fit and stability between the tilting auxiliary structure and the eyepiece assembly spacer 20. Specifically, the splicing surface can use threaded connections, snap-fit ​​connections, or other reliable connection methods to ensure the structural robustness.

[0046] Understandably, different combinations of materials can be selected to optimize the effect of tilt angle 21, depending on specific needs. For example, materials with high hardness and wear resistance can be selected to make the tilt angle auxiliary structure of the eyepiece assembly spacer 20 to improve its durability; at the same time, materials with good reflective properties and stability can be selected to make the tilt angle auxiliary structure to ensure its accuracy and reliability.

[0047] In addition, by selecting different combinations of materials, costs can be reduced while maintaining performance. For example, cheaper materials can be used to make the eyepiece assembly spacer 20, while more expensive materials can be used to make the tilt assist structure. Furthermore, the modular design allows the tilt assist structure and the eyepiece assembly spacer 20 to be manufactured and processed separately, simplifying the manufacturing process. If either the tilt assist structure or the eyepiece assembly spacer 20 is damaged or needs replacement, it can be replaced individually without replacing the entire assembly.

[0048] Furthermore, in one feasible embodiment, the splicing surface is provided with a connecting part, and the inner side of the eyepiece assembly spacer is provided with a mating part; the connecting part and the mating part are fitted together to form a mating body; the height of the mating body is adjustable to change the distance between the tilt angle and the axis of the eyepiece assembly spacer.

[0049] It should be noted that the connecting part is a special structure located on the splicing surface, used to mate or connect with another component. The mating part is a structure located inside the eyepiece assembly spacer, used to mate or connect with the connecting part.

[0050] It should be noted that the connecting part and the mating part are engaged or connected in some way, such as by threads, snaps, or plugs, to form a whole or mating body. This mating body has an adjustable height, meaning that its height can be changed by some mechanism such as a knob or screw. By adjusting the height of the mating body, the distance between the tilt angle and the axis of the eyepiece assembly spacer can be changed.

[0051] Understandably, as the height of the ligand increases, the distance between the tilt angle and the center of the eyepiece assembly spacer shortens, which can better deflect the reflected light spot away from the optical system. However, there is also a risk that the target light will be reflected. Therefore, the appropriate range of the height of the ligand needs to be determined experimentally.

[0052] Additionally, it should be noted that the tilt angle is within the range of 2 to 30 degrees. The tilt angle 21 directly affects the optical path adjustment of the reflected light spot. A smaller angle may not be sufficient to significantly change the optical path, while a larger angle may lead to excessive optical path deflection, thus affecting image quality. Within the range of 2 to 30 degrees, the tilt angle 21 provides moderate optical path adjustment, neither too weak nor too drastic, thereby helping to optimize the imaging effect.

[0053] Understandably, the larger the tilt angle 21, the greater the manufacturing difficulty. More precise machining and higher manufacturing accuracy are required to ensure the accuracy and consistency of the tilt angle. Within the range of 2 to 30 degrees, the manufacturing difficulty is relatively moderate, which helps control manufacturing costs and improve production efficiency. At the same time, within this angle range, the tilt angle 21 exhibits relatively good stability, resisting certain external interferences and temperature changes, thus ensuring the stability and reliability of the optical system.

[0054] In addition, the lens retaining ring structure also includes a fastening ring 40; the fastening ring 40 is coaxial with the second eyepiece and is disposed at the rear of the second eyepiece.

[0055] It should be noted that the fastening ring is placed at the rear of the second eyepiece, which means that it is located behind the second eyepiece in the light path. The main function of the fastening ring 40 is to provide additional support and fixation, ensuring that the second eyepiece is stably positioned in the optical system and will not move due to vibration, temperature changes or other external factors.

[0056] Understandably, the fastening ring 40 can also be tilted on the inside to adjust or fine-tune the light from the second eyepiece to achieve more precise optical performance.

[0057] In this embodiment, precise control of the light reflection path can be achieved by finely adjusting the slope design inside the lens spacer. This structural change ensures that the reflected spot is directionally reflected to other non-sensitive structural areas of the optical system, thereby effectively preventing unnecessary reflected spots from directly entering the imaging optical path and significantly reducing the interference of stray light and glare on imaging.

[0058] Furthermore, this application also proposes a fundus camera that employs the lens retainer structure described above. Since the fundus camera utilizes all the technical solutions of all the above embodiments, it possesses at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be elaborated upon here.

[0059] The above description is only a part of the embodiments of this application and does not limit the patent scope of this application. All equivalent structural transformations made under the technical concept of this application and using the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included in the patent protection scope of this application.

Claims

1. A lens retaining ring structure, characterized in that, The lens retainer structure includes: a first eyepiece lens, a second eyepiece lens, and an eyepiece group spacer; The first eyepiece lens, the eyepiece lens group spacer, and the second eyepiece lens are arranged coaxially from front to back; The eyepiece assembly spacer has an inner tilt angle to change the optical path of the reflected light spot.

2. The lens retaining ring structure as described in claim 1, characterized in that, The tilt angle is generated by machining the eyepiece assembly spacer ring, and the tilt angle and the eyepiece assembly spacer ring are integrally formed.

3. The lens retaining ring structure as described in claim 1, characterized in that, The lens retainer structure also includes: a tilt angle auxiliary structure; The tilting auxiliary structure includes a slope and a splicing surface; The tilting auxiliary structure is spliced ​​with the eyepiece assembly spacer via the splicing surface; The tilt angle is the angle between the inclined surface of the tilt angle auxiliary structure and the horizontal line.

4. The lens retaining ring structure as described in claim 3, characterized in that, The splicing surface is provided with a connecting part, and the inner side of the eyepiece assembly spacer is provided with a mating part; The connecting part and the mating part are fitted together to form a mating body; The height of the mating body is adjustable, which is used to change the distance between the tilt angle and the center of the eyepiece assembly spacer.

5. The lens retaining ring structure as described in any one of claims 1 to 4, characterized in that, The tilt angle is in the range of 2 to 30 degrees.

6. The lens retaining ring structure as described in claim 5, characterized in that, The lens retaining ring structure also includes: a fastening ring; The fastening ring is coaxial with the second eyepiece and is located at the rear of the second eyepiece.

7. A fundus camera, characterized in that, The fundus camera uses the lens retainer structure as described in any one of claims 1 to 6.

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