Short-structure high-definition optical path system for microscopic observation

Abstract

The present application relates to the field of microscope technology, and more particularly to a short structure high-definition optical path system for microscopic observation, which comprises a compact optical path structure formed by a cover glass, a first doublet lens, a double convex lens and a second doublet lens arranged in sequence along the optical axis direction, and realizes high-definition imaging in a short structure, effectively solving the problem of large volume and inconvenience of carrying of laboratory microscopes. The first doublet lens is used to eliminate axial chromatic aberration, the double convex lens is used to converge the light beam and correct spherical aberration, and the second doublet lens is used to further compensate residual chromatic aberration, which significantly improves the imaging quality and solves the problem of insufficient clarity of existing portable microscopes. In addition, by screwing the first lens barrel to the object side end of the outer adapter sleeve, the distance between the first doublet lens and the double convex lens can be adjusted, so that the imaging effect can be optimized according to the actual sample situation, and the applicability and imaging clarity of the system are further improved.

Description

Technical Field

[0001] This invention relates to the field of microscopy, and more particularly to a short-structure high-definition optical path system for microscopic observation. Background Technology

[0002] Microscopes are a core tool for humankind to explore the microscopic world, playing an irreplaceable role in fields such as medical diagnosis, biological research, and materials analysis. In clinical testing procedures such as reproductive health diagnosis and treatment, assisted reproductive technology implementation, and male fertility assessment, microscopic observation of sperm morphology and motility is a crucial testing step.

[0003] Currently, microscopes used in the above-mentioned scenarios are mainly divided into two categories: one is high-precision laboratory microscopes, which have high imaging clarity and comprehensive functions, but are usually bulky, complex in structure, and difficult to transport, making it difficult to meet the needs of on-site testing or daily home monitoring; the other is portable medical microscopes, which have advantages such as small size, portability, and instant detection, and are suitable for bedside diagnosis or home scenarios. However, due to the limited compact optical path design, their imaging clarity is generally insufficient, especially when observing at high magnification, they are prone to problems such as large aberrations, low resolution, and blurry images, making it difficult to meet the application requirements of sperm morphology analysis, which have high requirements for imaging quality.

[0004] In summary, since home-based portable sperm testing and other scenarios require high levels of portability and image clarity, there is an urgent need for an optical system that is compact in structure and has excellent image quality. Summary of the Invention

[0005] The purpose of this invention is to provide a short-structure high-definition optical path system for microscopic observation, which solves the technical problems of insufficient imaging clarity of existing portable microscopes and the large size and inconvenience of laboratory microscopes.

[0006] To achieve the above objectives, the present invention provides a short-structure high-definition optical path system for microscopic observation. The short-structure high-definition optical path system for microscopic observation comprises, from the object side to the image side, the following components along the optical axis: a coverslip, a first cemented doublet, a biconvex lens, a second cemented doublet, and an image plane; the principal optical axis of the coverslip, the principal optical axis of the first cemented doublet, the principal optical axis of the biconvex lens, and the principal optical axis of the second cemented doublet are coaxial.

[0007] The short-structure high-definition optical path system for microscopic observation also includes an external lens tube, which is composed of a first lens tube, a second lens tube, a third lens tube, and an outer connecting sleeve. The first lens tube is used to install the first cemented doublet lens, the second lens tube is used to install the biconvex lens, and the third lens tube is used to install the second cemented doublet lens. The second lens tube and the third lens tube are arranged sequentially inside the outer connecting sleeve along the optical axis. The first lens tube is threaded to the object-side end of the outer connecting sleeve.

[0008] The cover glass is located on the object side of the first cemented doublet, and the image plane is located on the image side of the second cemented doublet.

[0009] The first cemented doublet lens is formed by cementing a first lens near the object side and a second lens near the image side together.

[0010] The radius of curvature R1 of the object side surface of the first cemented doublet lens satisfies: 5.7 mm ≤ R1 ≤ 5.8 mm;

[0011] The curvature radius R2 of the cemented surface of the first doublet lens satisfies: 4.6 mm ≤ R2 ≤ 4.7 mm;

[0012] The image-side radius of curvature R3 of the first cemented doublet lens satisfies: -5.3 mm ≤ R3 ≤ -5.2 mm;

[0013] The first lens is made of H-ZF62 material, and the second lens is made of H-TK9 material.

[0014] The object-side radius of curvature R4 of the biconvex lens satisfies: 36.1 mm ≤ R4 ≤ 36.2 mm;

[0015] The radius of curvature R5 of the image-side surface of the biconvex lens satisfies: -12.2 mm ≤ R5 ≤ -12.1 mm;

[0016] The material of the biconvex lens is H-TK9.

[0017] The second cemented doublet lens is formed by cementing a third lens near the object side and a fourth lens near the image side.

[0018] The radius of curvature R6 of the object side surface of the second cemented doublet lens satisfies: 8.6 mm ≤ R6 ≤ 8.7 mm;

[0019] The curvature radius R7 of the cemented surface of the second doublet lens satisfies: -11.2 mm ≤ R7 ≤ -11.1 mm;

[0020] The image-side radius of curvature R8 of the second cemented doublet lens satisfies: 3.5 mm ≤ R8 ≤ 3.6 mm;

[0021] The third lens is made of H-ZK10 material, and the fourth lens is made of H-ZK1 material.

[0022] The air gap D1 between the cover glass and the first cemented doublet lens satisfies: 1.1 mm ≤ D1 ≤ 1.2 mm;

[0023] The air gap D2 between the first cemented doublet lens and the biconvex lens satisfies: 1.1 mm ≤ D2 ≤ 1.2 mm;

[0024] The air gap D3 between the biconvex lens and the second cemented doublet lens satisfies: 19.0 mm ≤ D3 ≤ 19.1 mm;

[0025] The air gap D4 between the second cemented doublet lens and the image plane satisfies: 50.3 mm ≤ D4 ≤ 50.4 mm.

[0026] The center thickness of the first cemented doublet lens, the biconvex lens, and the second cemented doublet lens is all greater than 0.8 mm.

[0027] The total optical length of the short-structure high-definition optical path system for microscopic observation is less than 100 mm.

[0028] This invention discloses a short-structure high-definition optical path system for microscopic observation, comprising, from the object side to the image side along the optical axis: a coverslip, a first cemented doublet, a biconvex lens, a second cemented doublet, and an image plane. Because the total length of this optical path system is less than 100 mm, its compact structure makes it easy to carry and suitable for home or on-site microscopic examination scenarios, solving the problem of bulky and inconvenient-to-carry laboratory microscopes. Furthermore, this optical path system exhibits an MTF value greater than 0.2 at a spatial frequency of 52 lp / mm and an RMS radius of less than 15 μm on the image plane, resulting in high imaging clarity. This meets the clarity requirements for medical microscopic observations such as sperm testing, addressing the insufficient imaging clarity of existing portable microscopes. Moreover, by rotating the first microscope tube, the distance between the first cemented doublet and the biconvex lens can be adjusted, further optimizing the actual imaging quality and improving the system's adaptability to different samples. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a partial structural schematic diagram of the short-structure high-definition optical path system for microscopic observation provided by the present invention.

[0031] Figure 2 This is a schematic diagram of the internal structure of the external lens barrel provided by the present invention.

[0032] Figure 3 This is a schematic diagram showing the corresponding numbers on each lens surface provided by the present invention.

[0033] Figure 4 This is a dot diagram of the short-structure high-definition optical path system for microscopic observation provided by the present invention.

[0034] Figure 5 This is the MTF diagram of the short-structure high-definition optical path system for microscopic observation provided by the present invention.

[0035] 101-Cover glass, 102-Biconvex lens, 103-Image plane, 104-First lens barrel, 105-Second lens barrel, 106-Third lens barrel, 107-Outer connecting sleeve, 108-First lens, 109-Second lens, 110-Third lens, 111-Fourth lens, 112-Washer. Detailed Implementation

[0036] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0037] Please see Figure 1 and Figure 2 This invention provides a short-structure high-definition optical path system for microscopic observation. The short-structure high-definition optical path system for microscopic observation comprises, from the object side to the image side, the following components along the optical axis: a coverslip 101, a first cemented doublet, a biconvex lens 102, a second cemented doublet, and an image plane 103; the principal optical axes of the coverslip 101, the first cemented doublet, the biconvex lens 102, and the second cemented doublet are coaxial.

[0038] The short-structure high-definition optical path system for microscopic observation also includes an external lens barrel, which is composed of a first lens barrel 104, a second lens barrel 105, a third lens barrel 106, and an outer connecting sleeve 107. The first lens barrel 104 is used to install the first cemented doublet lens, the second lens barrel 105 is used to install the biconvex lens 102, and the third lens barrel 106 is used to install the second cemented doublet lens. The second lens barrel 105 and the third lens barrel 106 are sequentially arranged inside the outer connecting sleeve 107 along the optical axis. The first lens barrel 104 is threaded to the object-side end of the outer connecting sleeve 107.

[0039] The cover glass 101 is located on the object side of the first cemented doublet lens, and the image plane 103 is located on the image side of the second cemented doublet lens.

[0040] In this embodiment, a compact optical path structure consisting of the coverslip 101, the first cemented doublet, the biconvex lens 102, and the second cemented doublet, arranged sequentially along the optical axis, achieves high-resolution imaging within a short structure, effectively solving the problem of bulky and inconvenient-to-carry laboratory microscopes. Specifically, the first cemented doublet eliminates axial chromatic aberration, the biconvex lens 102 converges the beam and corrects spherical aberration, and the second cemented doublet further compensates for residual chromatic aberration, significantly improving image quality and addressing the insufficient clarity of existing portable microscopes. Furthermore, by threading the first microscope tube 104 to the object-side end of the outer connecting sleeve 107, the distance between the first cemented doublet and the biconvex lens 102 can be adjusted, thereby optimizing the imaging effect according to the actual sample conditions and further improving the system's applicability and imaging clarity.

[0041] Furthermore, the first cemented doublet lens is formed by cementing a first lens 108 near the object side and a second lens 109 near the image side;

[0042] The radius of curvature R1 of the object side surface of the first cemented doublet lens satisfies: 5.7 mm ≤ R1 ≤ 5.8 mm;

[0043] The curvature radius R2 of the cemented surface of the first doublet lens satisfies: 4.6 mm ≤ R2 ≤ 4.7 mm;

[0044] The image-side radius of curvature R3 of the first cemented doublet lens satisfies: -5.3 mm ≤ R3 ≤ -5.2 mm;

[0045] The first lens 108 is made of H-ZF62 material, and the second lens 109 is made of H-TK9 material.

[0046] Furthermore, the radius of curvature R4 of the object side surface of the biconvex lens 102 satisfies: 36.1 mm ≤ R4 ≤ 36.2 mm;

[0047] The radius of curvature R5 of the image side surface of the biconvex lens 102 satisfies: -12.2 mm ≤ R5 ≤ -12.1 mm;

[0048] The biconvex lens 102 is made of H-TK9 material.

[0049] Furthermore, the second cemented doublet lens is formed by cementing a third lens 110 near the object side and a fourth lens 111 near the image side.

[0050] The radius of curvature R6 of the object side surface of the second cemented doublet lens satisfies: 8.6 mm ≤ R6 ≤ 8.7 mm;

[0051] The curvature radius R7 of the cemented surface of the second doublet lens satisfies: -11.2 mm ≤ R7 ≤ -11.1 mm;

[0052] The image-side radius of curvature R8 of the second cemented doublet lens satisfies: 3.5 mm ≤ R8 ≤ 3.6 mm;

[0053] The third lens 110 is made of H-ZK10, and the fourth lens 111 is made of H-ZK1.

[0054] Furthermore, the air gap D1 between the cover glass 101 and the first cemented doublet lens satisfies: 1.1 mm ≤ D1 ≤ 1.2 mm;

[0055] The air gap D2 between the first cemented doublet lens and the biconvex lens 102 satisfies: 1.1 mm ≤ D2 ≤ 1.2 mm;

[0056] The air gap D3 between the biconvex lens 102 and the second cemented doublet lens satisfies: 19.0 mm ≤ D3 ≤ 19.1 mm;

[0057] The air gap D4 between the second cemented doublet lens and the image plane 103 satisfies: 50.3 mm ≤ D4 ≤ 50.4 mm.

[0058] Furthermore, the center thickness of the first cemented doublet lens, the biconvex lens 102, and the second cemented doublet lens is all greater than 0.8 mm.

[0059] Furthermore, the total optical length of the short-structure high-definition optical path system for microscopic observation is less than 100 mm.

[0060] Furthermore, a gasket 112 is provided between the second lens barrel 105 and the third lens barrel 106.

[0061] Example 1:

[0062] This embodiment provides a short-structure high-definition optical path system for microscopic observation, which includes, in sequence from the object side to the image side along the optical axis: a cover glass 101, a first cemented doublet lens, a biconvex lens 102, a second cemented doublet lens, and an image plane 103; the principal optical axis of the cover glass 101, the principal optical axis of the first cemented doublet lens, the principal optical axis of the biconvex lens 102, and the principal optical axis of the second cemented doublet lens are coaxial.

[0063] The cover glass 101 is made of H-K9L material.

[0064] Among them, such as Figure 3 As shown, the first cemented lens is formed by cementing a first lens 108 near the object side and a second lens 109 near the image side. The object side of the first lens 108 is S1, the cementing surface of the first lens 108 and the second lens 109 is S2, and the image side of the second lens 109 is S3.

[0065] The object-side surface of the biconvex lens 102 is S4, and the image-side surface of the biconvex lens 102 is S5.

[0066] The second cemented doublet lens is formed by cementing a third lens 110 near the object side and a fourth lens 111 near the image side. The object side of the third lens 110 is S6, the cementing surface of the third lens 110 and the fourth lens 111 is S7, and the image side of the fourth lens 111 is S8.

[0067] The specific parameters of each surface of the first cemented doublet lens, the biconvex lens 102, and the second cemented doublet lens are shown in Table 1.

[0068] Table 1. Specific parameters of the surface of each lens

[0069]

[0070] As shown in Table 1, the object surface (i.e., the location of the cover glass 101) is a plane, and the thickness of the cover glass 101 is 1.18 mm.

[0071] The S1 surface has a radius of curvature of 5.771 mm, a center thickness of 4.52 mm, a light-transmitting aperture of 5 mm, and is made of crown glass with a refractive index n0=1.92 and an Abbe number Vd=20.87.

[0072] The S2 surface has a radius of curvature of 4.665 mm, a center thickness of 3.24 mm, a light-transmitting aperture of 6 mm, and is made of crown glass with a refractive index n0=1.62 and an Abbe number Vd=60.30.

[0073] The radius of curvature of surface S3 is -5.224 mm, the axial distance between it and surface S4 is 1.17 mm, the aperture is 6 mm, and the medium within this interval is air.

[0074] The S4 surface has a radius of curvature of 36.133 mm, a center thickness of 1.84 mm, a light-transmitting aperture of 6 mm, and is made of crown glass with a refractive index n0=1.62 and an Abbe number Vd=56.70.

[0075] The radius of curvature of surface S5 is -12.144 mm, the axial distance between it and surface S6 is 19.06 mm, the aperture is 7 mm, and the medium within this interval is air.

[0076] The S6 surface has a radius of curvature of 8.666 mm, a center thickness of 4.91 mm, a light-transmitting aperture of 7 mm, and is made of crown glass with a refractive index n0=1.62 and an Abbe number Vd=56.70.

[0077] The S7 surface has a radius of curvature of -11.132 mm, a center thickness of 6.5 mm, a light-transmitting aperture of 7 mm, and is made of crown glass with a refractive index n0=1.57 and an Abbe number Vd=62.95.

[0078] The radius of curvature of the S8 surface is 3.517 mm, the axial distance between it and the image surface 103 is 50.33 mm, the aperture is 4 mm, and the medium within this interval is air.

[0079] The image plane 103 is planar, and the light-transmitting aperture is 7 mm.

[0080] In summary, in the optical path system of this embodiment, light rays sequentially pass through the object plane, S1 plane, S2 plane, S3 plane, S4 plane, S5 plane, S6 plane, S7 plane, and S8 plane before reaching the image plane 103. Specifically, S1, S2, and S3 planes constitute the first cemented doublet lens, S4 and S5 planes constitute the biconvex lens 102, and S6, S7, and S8 planes constitute the second cemented doublet lens.

[0081] The total length of the optical path system in this embodiment is 93 mm (from the object plane to the image plane 103), and the total optical length is less than 100 mm. The center thickness of each lens is greater than 0.8 mm, avoiding the manufacturing difficulties caused by excessively thin lenses. This optical path system can achieve 21x magnification imaging, and the RMS radius of the light spot on the image plane 103 is less than 15 μm (for optical simulation results of this light spot, see...). Figure 4 At a spatial frequency of 52 lp / mm, the MTF value is greater than 0.2 (see details of the corresponding MTF test image). Figure 5 With a numerical aperture NA ≥ 0.5, it can meet the requirements for high-definition imaging in medical microscopic observation scenarios such as sperm testing.

[0082] The above description discloses only one preferred embodiment of the present invention, and should not be construed as limiting the scope of the present invention. Those skilled in the art will understand that all or part of the processes of the above embodiments can be implemented, and equivalent changes made in accordance with the claims of the present invention are still within the scope of the invention.

Claims

1. A short-structure high-definition optical path system for microscopic observation, characterized in that, Along the optical axis from the object side to the image side, it sequentially includes: a cover glass, a first cemented doublet, a biconvex lens, a second cemented doublet, and an image plane; the principal optical axis of the cover glass, the principal optical axis of the first cemented doublet, the principal optical axis of the biconvex lens, and the principal optical axis of the second cemented doublet are coaxial; The short-structure high-definition optical path system for microscopic observation also includes an external lens barrel, which is composed of a first lens barrel, a second lens barrel, a third lens barrel, and an outer connecting sleeve. The first lens barrel is used to install the first cemented doublet lens, the second lens barrel is used to install the biconvex lens, and the third lens barrel is used to install the second cemented doublet lens. The second lens barrel and the third lens barrel are arranged sequentially inside the outer connecting sleeve along the optical axis. The first lens barrel is threaded to the object-side end of the outer connecting sleeve. The cover glass is located on the object side of the first cemented doublet, and the image plane is located on the image side of the second cemented doublet.

2. The short-structure high-definition optical path system for microscopic observation as described in claim 1, characterized in that, The first cemented doublet lens is formed by cementing a first lens near the object side and a second lens near the image side; The radius of curvature R1 of the object side surface of the first cemented doublet lens satisfies: 5.7 mm ≤ R1 ≤ 5.8 mm; The curvature radius R2 of the cemented surface of the first doublet lens satisfies: 4.6 mm ≤ R2 ≤ 4.7 mm; The image-side radius of curvature R3 of the first cemented doublet lens satisfies: -5.3 mm ≤ R3 ≤ -5.2 mm; The first lens is made of H-ZF62 material, and the second lens is made of H-TK9 material.

3. The short-structure high-definition optical path system for microscopic observation as described in claim 2, characterized in that, The radius of curvature R4 of the object side surface of the biconvex lens satisfies: 36.1 mm ≤ R4 ≤ 36.2 mm; The radius of curvature R5 of the image-side surface of the biconvex lens satisfies: -12.2 mm ≤ R5 ≤ -12.1 mm; The material of the biconvex lens is H-TK9.

4. The short-structure high-definition optical path system for microscopic observation as described in claim 3, characterized in that, The second cemented doublet lens is formed by cementing a third lens near the object side and a fourth lens near the image side; The radius of curvature R6 of the object side surface of the second cemented doublet lens satisfies: 8.6 mm ≤ R6 ≤ 8.7 mm; The curvature radius R7 of the cemented surface of the second doublet lens satisfies: -11.2 mm ≤ R7 ≤ -11.1 mm; The image-side radius of curvature R8 of the second cemented doublet lens satisfies: 3.5 mm ≤ R8 ≤ 3.6 mm; The third lens is made of H-ZK10 material, and the fourth lens is made of H-ZK1 material.

5. The short-structure high-definition optical path system for microscopic observation as described in claim 4, characterized in that, The air gap D1 between the cover glass and the first cemented doublet lens satisfies: 1.1 mm ≤ D1 ≤ 1.2 mm; The air gap D2 between the first cemented doublet lens and the biconvex lens satisfies: 1.1 mm ≤ D2 ≤ 1.2 mm; The air gap D3 between the biconvex lens and the second cemented doublet lens satisfies: 19.0 mm ≤ D3 ≤ 19.1 mm; The air gap D4 between the second cemented doublet lens and the image plane satisfies: 50.3 mm ≤ D4 ≤ 50.4 mm.

6. The short-structure high-definition optical path system for microscopic observation as described in claim 5, characterized in that, The center thickness of the first cemented doublet lens, the biconvex lens, and the second cemented doublet lens is all greater than 0.8 mm.

7. The short-structure high-definition optical path system for microscopic observation as described in claim 6, characterized in that, The total optical length of the short-structure high-definition optical path system for microscopic observation is less than 100 mm.

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