Magnifying glass and medical camera
By using a combination of positive and negative focal lengths in the medical magnifier to compensate for the aberration, the problem of insufficient image clarity in the cell detection of medical magnifier is solved, achieving higher imaging quality and clearer images.
Patent Information
- Application Number
- CN202421293011.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-06
- Publication Date
- 2025-04-04
- Estimated Expiration
- 2034-06-06
AI Technical Summary
Existing medical magnifiers have problems with insufficient image clarity in cell detection, resulting in inaccurate detection results.
A magnifying glass is designed, using a combination of positive and negative focal lengths. By combining different lenses and lens sets, aberrations such as spherical aberration and dispersion are compensated to improve imaging quality.
With this multi-lens combination, the image is improved sharpness and contrast, providing a wider field of view and a flatter field of view curvature, allowing the image to remain clear throughout the field of view.
Smart Images
Figure CN222719763U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of medical imaging equipment, in particular to a magnifying glass and a medical imaging device. Background Art
[0002] With the continuous advancement of science and technology, the technical requirements for various equipment in the market are increasing day by day, especially in the medical field, where accuracy and safety have become the focus of users. Equipment such as medical endoscopes and medical magnifiers face higher requirements in terms of imaging quality, high definition and color reproduction. In order to meet these needs, the market is in urgent need of a medical microscope magnifier with high imaging performance.
[0003] The medical magnifying glass products currently on the market have the problem of insufficient image clarity in cell detection. Sometimes the image in the center, periphery or a certain corner of the screen is not clear, which leads to inaccurate detection results. Utility Model Content
[0004] The main purpose of the utility model is to provide a magnifying glass and a medical camera device, aiming to solve the problem that the image taken by the existing magnifying glass is not clear.
[0005] To achieve the above-mentioned purpose, the utility model provides a magnifying glass, which includes a first lens, a second lens, a first lens group and a second lens group arranged along the same optical axis and in sequence from the image side to the object side, and the first lens has a positive focal length, the second lens has a negative focal length, the first lens group has a positive focal length, and the second lens group has a positive focal length.
[0006] In one embodiment, the first lens group includes a third lens and a fourth lens bonded to each other to form a cemented lens, and the third lens and the fourth lens have different refractive indices.
[0007] In one embodiment, the second lens group includes a fifth lens and a sixth lens bonded to each other to form a cemented lens, and the refractive indexes of the fifth lens and the sixth lens are different.
[0008] In one embodiment, the image side surfaces of the first lens, the second lens, and the third lens are all convex surfaces, the object side surfaces of the first lens, the second lens, and the third lens are all concave surfaces, the fourth lens and the fifth lens are both biconvex lenses, the image side surface of the sixth lens is concave, and the object side surface of the sixth lens is convex.
[0009] In one embodiment, the first lens, the third lens, the fourth lens and the sixth lens are all made of a material with a high refractive index to form a focusing group.
[0010] In one embodiment, the first lens, the second lens and the sixth lens are all made of a material with a low dispersion coefficient.
[0011] In one embodiment, the first lens and the second lens are spaced apart, the second lens and the first lens group are spaced apart, and the first lens group and the second lens group are bonded together.
[0012] In one embodiment, the magnifying glass further includes a filter, and the filter is disposed on a side of the first lens away from the second lens.
[0013] The utility model also provides a medical imaging device, which comprises the magnifying glass described in any one of the above embodiments.
[0014] In the technical solution of the utility model, the magnifying glass adopts a combination of lenses with positive and negative focal lengths. The combination of lenses with different focal lengths can compensate for aberrations such as spherical aberration, dispersion, etc., thereby improving the image quality. In addition, the combination of the positive focal length of the first lens and the negative focal length of the second lens can partially offset the dispersion, and the combination of the positive focal length of the first lens group and the positive focal length of the second lens group can reduce spherical aberration. In this solution, by combining lenses with positive and negative focal lengths, the clarity and contrast of the image can be further improved. This multi-lens combination can provide a wider field of view and a flatter field of view curvature, thereby keeping the image clear within the entire field of view. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] In order to more clearly illustrate the embodiments of the utility model 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, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.
[0016] Figure 1 A schematic structural diagram of an embodiment of a magnifying glass provided by the utility model;
[0017] Figure 2 An MTF curve diagram of an embodiment of a magnifying glass provided by the utility model;
[0018] Figure 3 A through-focus MTF curve diagram of another embodiment of the magnifying glass provided by the utility model;
[0019] Figure 4 A spot diagram of another embodiment of the magnifying glass provided by the utility model;
[0020] Figure 5A relative illumination curve diagram of another embodiment of the magnifying glass provided by the utility model;
[0021] Figure 6 This is a vertical axis chromatic aberration curve diagram of another embodiment of the magnifying glass provided by the utility model.
[0022] Description of Figure Numbers:
[0023] 100. Magnifying glass; 1. First lens; 2. Second lens; 3. Third lens; 4. Fourth lens; 5. Fifth lens; 6. Sixth lens.
[0024] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION
[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0026] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.
[0027] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the utility model.
[0028] The medical magnifying glass products currently on the market have the problem of insufficient image clarity in cell detection. Sometimes the image in the center, periphery or a certain corner of the screen is not clear, which leads to inaccurate detection results.
[0029] The utility model provides a magnifying glass. Figures 1 to 3 In one embodiment of the utility model, the magnifying glass 100 includes a first lens 1, a second lens 2, a first lens group and a second lens group arranged along the same optical axis and in sequence from the image side to the object side, and the first lens 1 has a positive focal length, the second lens 2 has a negative focal length, the first lens group has a positive focal length, and the second lens group has a positive focal length.
[0030] In the technical solution of the utility model, the magnifying glass 100 uses a combination of lenses with positive and negative focal lengths. The combination of lenses with different focal lengths can compensate for aberrations such as spherical aberration, dispersion, etc., thereby improving the image quality. In addition, the combination of the positive focal length of the first lens 1 and the negative focal length of the second lens 2 can partially offset the dispersion, and the combination of the positive focal length of the first lens group and the positive focal length of the second lens group can reduce spherical aberration. In this solution, by combining lenses with positive and negative focal lengths, the clarity and contrast of the image can be further improved. This multi-lens combination can provide a wider field of view and a flatter field of view curvature, thereby keeping the image clear throughout the field of view.
[0031] In the embodiments of the present invention, please refer to Figure 1 As shown in Table 1 below, the first lens group includes a third lens 3 and a fourth lens 4 bonded to each other to form a bonded lens, and the refractive indexes of the third lens 3 and the fourth lens 4 are different. In another embodiment of the utility model, the second lens group includes a fifth lens 5 and a sixth lens 6 bonded to each other to form a bonded lens, and the refractive indexes of the fifth lens 5 and the sixth lens 6 are different. By using lenses with different refractive indices and bonding them together to form a composite optical lens of the lens group, the imaging effect of high and low temperatures is ensured, and aberrations in the optical system, such as spherical aberration and dispersion, can be reduced or eliminated. In addition, the use of different optical materials may also have a higher absorption of light of a specific wavelength, and by bonding different lenses, the transmittance in the entire band can be improved. In addition, by selecting the concave-convex and material combinations of different lenses, the deformation and refractive index changes caused by high and low temperatures can be compensated. The optical properties of the lens group, such as focal length, aperture, etc., can be accurately controlled.
[0032] In the embodiments of the present invention, please refer to Figure 1, the image side surfaces of the first lens 1, the second lens 2 and the third lens 3 are all convex, the object side surfaces of the first lens 1, the second lens 2 and the third lens 3 are all concave, the fourth lens 4 and the fifth lens 5 are both biconvex lenses, the image side surface of the sixth lens 6 is concave, and the object side surface of the sixth lens 6 is convex. In the magnifying glass 100, the convex surface design of the image side surface of the first lens 1, the second lens 2 and the third lens 3 helps to collect and focus the light entering the magnifying glass 100, thereby improving the imaging quality. At the same time, the concave surface design of the object side surface helps to expand the object distance range and enhance the adaptability of the system. In addition, the biconvex lens design of the fourth lens 4 and the fifth lens 5 can reduce the overall volume and weight of the magnifying glass 100 while ensuring the imaging quality, making it easier to carry and use. The concave surface design of the image side surface of the sixth lens 6 helps to further correct aberrations and improve the imaging quality, and the convex surface design of the object side surface helps to reduce the volume and improve the overall optical performance.
[0033] In the embodiment of the utility model, please refer to Table 1 below. The first lens 1, the third lens 3, the fourth lens 4 and the sixth lens 6 are all made of high refractive index materials to form a focusing group. High refractive index materials have a larger refractive index and can focus light more effectively, thereby improving the imaging quality. At the same time, they also play a certain role in image telecentricity. In an optical system, the function of the focusing group is to collect and focus the light entering the system so that it forms a clear image on the image plane. By using high refractive index materials, the focusing group can complete this task more effectively and achieve high-quality imaging effects.
[0034] In the embodiments of the present invention, please refer to Figure 6 The first lens 1, the second lens 2 and the sixth lens 6 are all made of materials with low dispersion coefficients, which helps to improve the imaging performance of the optical system. In the optical system, these three lenses have different positions and functions, but they all participate in the refraction and focusing process of light. By using materials with low dispersion coefficients, these three lenses can more effectively complete the refraction and focusing tasks of light, reduce chromatic aberration, and achieve high-quality imaging effects.
[0035] In the embodiments of the present invention, please refer to Figure 1 , Figure 4 and Figure 5, the first lens 1 and the second lens 2 are arranged at an interval, and a certain optical interval can be formed between the two, which helps to optimize the optical path and imaging performance. This design can make the light produce appropriate refraction and deflection when passing through the first lens 1 and the second lens 2, so as to better converge on the image plane and form a clear image. In addition, the second lens 2 is arranged at an interval from the first lens group, which helps to adjust the optical path and imaging effect. This design allows the refraction and focusing degree of light to be adjusted by changing the interval distance, so as to achieve the desired magnification and imaging effect. The first lens group and the second lens group are arranged in a close relationship, which helps to further improve the imaging quality. This design can reduce aberrations and halos, and improve the clarity and contrast of the image. At the same time, the close-fitting lens group can also reduce the volume and weight of the entire optical system, making it easier to carry and use.
[0036] Of course, in other embodiments, the above-mentioned embodiments can also be combined and arranged, and the obtained magnifying glass 100 is a fixed-focus lens, with a magnification of up to 20 times, an optimal object distance of 3mm, a numerical aperture of 0.35, a depth of field of 4mm, and an object resolution of 0.65μm, while ensuring high resolution; a temperature compensation design is adopted, and it works in an environment of -40℃~+80℃ without defocusing; the mutual compensation of the positive and negative lens focal lengths is adopted, which not only ensures the performance of the optical system, but also reduces the processing cost, simplifies the structure, reduces the weight, and is conducive to mass production, meeting market demand; while using low-dispersion materials, the image quality can also be improved. Table 1 shows the surface type, radius of curvature, thickness / distance, refractive index, dispersion coefficient and focal length of each lens in the magnifying glass 100, where the units of the radius of curvature and thickness are both millimeters (mm).
[0037] Table 1:
[0038]
[0039] In the embodiments of the present invention, please refer to Figure 5 , the magnifying glass 100 also includes a filter, which is arranged on the side of the first lens 1 away from the second lens 2. The use of the filter can effectively remove unnecessary wavelengths during imaging. For example, in a fluorescence microscope, the filter can isolate the excitation light and the emission light to improve the purity and intensity of the fluorescence signal. In addition, the filter can also be used to improve the contrast of the image, by absorbing background noise or enhancing the signal of the area of interest, so that the observed sample is clearer.
[0040] The utility model further provides a medical imaging device, which includes the magnifying glass 100 described in any one of the above embodiments. The specific structure of the magnifying glass 100 refers to the above embodiments. Since the medical imaging device adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.
[0041] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.
Claims
1. A magnifying glass, characterized in that: The magnifying glass includes a first lens, a second lens, a first lens group and a second lens group which are arranged along the same optical axis and in sequence from the image side to the object side, and the first lens has a positive focal length, the second lens has a negative focal length, the first lens group has a positive focal length, and the second lens group has a positive focal length.
2. The magnifying glass according to claim 1, characterized in that The first lens group includes a third lens and a fourth lens bonded to each other to form a cemented lens, and the third lens and the fourth lens have different refractive indices.
3. The magnifying glass according to claim 2, characterized in that The second lens group includes a fifth lens and a sixth lens bonded to each other to form a cemented lens, and the refractive indexes of the fifth lens and the sixth lens are different.
4. The magnifying glass according to claim 3, characterized in that The image side surfaces of the first lens, the second lens and the third lens are all convex surfaces, the object side surfaces of the first lens, the second lens and the third lens are all concave surfaces, the fourth lens and the fifth lens are both biconvex lenses, the image side surface of the sixth lens is concave, and the object side surface of the sixth lens is convex.
5. The magnifying glass according to claim 3, characterized in that: The first lens, the third lens, the fourth lens and the sixth lens are all made of a material with a high refractive index to form a focusing group.
6. The magnifying glass according to claim 3, characterized in that The first lens, the second lens and the sixth lens are all made of a material with a low dispersion coefficient.
7. The magnifying glass according to claim 1, characterized in that The first lens and the second lens are spaced apart, the second lens and the first lens group are spaced apart, and the first lens group and the second lens group are bonded together.
8. The magnifying glass according to any one of claims 1 to 7, characterized in that The magnifying glass further includes a filter, and the filter is arranged on a side of the first lens away from the second lens.
9. A medical imaging device, characterized in that: The medical imaging device includes the magnifying glass according to any one of claims 1 to 8.