Ultraviolet lens

Abstract

The optical structure of the ultraviolet lens is sequentially provided with a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens from an object plane to an image plane along an optical axis, the first lens is a plano-concave lens, and the concave surface of the plano-concave lens is close to an image space; the second lens is a replaceable steering rod lens, the fourth lens is a replaceable optical filter, the third lens, the fifth lens and the sixth lens are biconvex lenses, and the seventh lens is a biconcave lens. A diaphragm is arranged between the third lens and the fourth lens. According to the utility model, the design is reasonable, the seven lenses are adopted, the fourth lens is the optical filter, and the endoscope can clearly see the state in a micro environment under the condition of different light source wavelengths only by changing different optical filters without designing multiple types of lenses, so that the design and development costs are effectively reduced, and the performance and efficiency of the endoscope lens are improved.

Description

Technical Field:

[0001] The utility model relates to an ultraviolet lens. Background Art:

[0002] An endoscope enters the human body through the body's natural orifices or through small incisions made during surgery. When in use, the endoscope is introduced into the organ to be examined, and the relevant parts can be directly observed. There are still many causes of diseases or various microbial molecules that cannot be detected by existing endoscopes. Therefore, light of different wavelengths is required for observation, but this often requires designing multiple different lenses, greatly increasing the design and development costs. For this reason, it is necessary to improve the above technical problems, and this case is thus born. Content of the Utility Model:

[0003] The utility model makes improvements to the above existing technical problems, that is, the technical problem to be solved by the utility model is to provide an ultraviolet lens with reasonable design, which can effectively reduce the design and development costs.

[0004] To achieve the above object, the technical solution adopted by the utility model is: an ultraviolet lens, the optical structure of the ultraviolet lens is sequentially provided with a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens along the optical axis from the object plane to the image plane. The first lens is a plano-concave lens with the concave surface close to the image side. The second lens is a replaceable turning rod lens. The fourth lens is a replaceable filter. The third lens, the fifth lens and the sixth lens are all biconvex lenses. The seventh lens is a biconcave lens. A diaphragm is arranged between the third lens and the fourth lens.

[0005] Further, the second lens is a 0° turning rod lens or a 90° turning prism.

[0006] Further, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are all made of ultraviolet highly transmissive optical glass.

[0007] Further, the materials of the second lens and the seventh lens are the same, and the materials of the fifth lens and the sixth lens are the same. When the ultraviolet lens is in the state of a 370nm wavelength and the thickness of all lenses is 0.25mm, the internal transmittance is greater than 0.99.

[0008] Further, the glass refractive index N1 and dispersion coefficient V1 of the first lens, and the glass refractive index N7 and dispersion coefficient V7 of the seventh lens satisfy the following relationships: 1.7 < N1 < N7 < 1.9, V1 ≤ 50, V7 ≤ 50; the glass refractive index N3 and dispersion coefficient V3 of the third lens, the glass refractive index N5 and dispersion coefficient V5 of the fifth lens, and the glass refractive index N6 and dispersion coefficient V6 of the sixth lens satisfy the following relationships: 1.4 < N5 = N6 < N3 < 1.6, V3 ≥ 90, V5 ≥ 90, V6 ≥ 90.

[0009] Further, the focal length F1 of the first lens and the focal length F of the ultraviolet lens satisfy the following relationship: -0.8 < F1 / F < -0.7; the focal lengths F2 of the second lens to the seventh lens and the focal length F of the ultraviolet lens satisfy the following relationship: 0.8 < F2 / F < 1.0.

[0010] Further, the optical total length T of the optical structure and the target surface size D satisfy the following relationship: 2.8 < T / D < 3.3.

[0011] Further, the center distance between the object side and the image side of the first lens is 0.25 mm, and the center distance between the image side of the first lens and the object side of the second lens is 0.31 mm; the center distance between the object side and the image side of the second lens is 1.55 mm, and the center distance between the image side of the second lens and the object side of the third lens is 0.026 mm; the center distance between the object side and the image side of the third lens is 0.65 mm, and the center distance between the image side of the third lens and the center of the aperture is 0.026 mm; the center distance between the aperture and the object side of the fourth lens is 0.016 mm; the center distance between the object side and the image side of the fourth lens is 0.3 mm, and the center distance between the image side of the fourth lens and the object side of the fifth lens is 0.034 mm; the center distance between the object side and the image side of the fifth lens is 0.7 mm, and the center distance between the image side of the fifth lens and the object side of the sixth lens is 0.014 mm; the center distance between the object side and the image side of the sixth lens is 0.778 mm, and the center distance between the image side of the sixth lens and the object side of the seventh lens is 0.08 mm; the center distance between the object side and the image side of the seventh lens is 0.25 mm.

[0012] Further, the working wavelength range of the ultraviolet lens is 350 - 1000 nm.

[0013] Further, a protective glass is provided at the front end of the ultraviolet lens.

[0014] Compared with the prior art, the utility model has the following effects: The utility model is reasonably designed, composed of 7 lenses, and the fourth lens is a filter. By simply changing different filters, the endoscope can clearly see the state in a microenvironment under different light source wavelengths, without the need to design multiple types of lenses, effectively reducing the design and development costs and improving the performance and efficiency of the endoscope lens. Description of the Drawings:

[0015] Figure 1 It is a schematic diagram of the overall structure with a 0° viewing angle in an embodiment of the utility model;

[0016] Figure 2 It is a schematic diagram of the overall structure with a 90° viewing angle in an embodiment of the utility model.

[0017] In the figure:

[0018] 1 - First lens; 2a - 0° steering rod lens; 2b - 90° steering prism; 3 - Third lens; 4 - Fourth lens; 5 - Fifth lens; 6 - Sixth lens; 7 - Seventh lens; 8 - Protective sheet; 9 - Diaphragm; 10 - Lens barrel. Detailed Embodiment:

[0019] The following further describes the present utility model in detail with reference to the drawings and specific embodiments.

[0020] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0021] Embodiment 1: As Figure 1 shown, an ultraviolet lens of the present utility model, the optical structure of the ultraviolet lens adopts a glass lens group. Along the optical axis from the object plane to the image plane, the optical structure of the lens is successively provided with a first lens 1, a second lens, a third lens 3, a fourth lens 4, a fifth lens 5, a sixth lens 6, and a seventh lens 7, wherein: the first lens 1 is a plano - concave lens with the concave surface close to the image side; the second lens is a replaceable steering rod lens, which can be replaced according to different viewing angles; the fourth lens 4 is a replaceable filter, which can be replaced according to different light sources; the third lens 3, the fifth lens 5, and the sixth lens 6 are all biconvex lenses, and the seventh lens 7 is a biconcave lens; a diaphragm is arranged between the third lens and the fourth lens.

[0022] In this embodiment, the second lens is a 0° steering rod lens 2a.

[0023] In this embodiment, the first lens 1, the second lens, the third lens 3, the fourth lens 4, the fifth lens 5, the sixth lens 6, and the seventh lens 7 are all made of materials with strong ultraviolet transmittance. For example, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens are all made of ultraviolet high-transmission optical glass. The glass lens group is made of materials with strong ultraviolet transmittance, so that it has high-resolution performance in the working wavelength range of 350 - 1000 nm.

[0024] In this embodiment, the materials of the second lens and the seventh lens 7 are the same, and the materials of the fifth lens 5 and the sixth lens 6 are the same; when the ultraviolet lens is in the state of 370 nm wavelength and the thickness of all lenses is 0.25 mm, the internal transmittance is greater than 0.99.

[0025] In this embodiment, the first lens 1 and the second lens 2a are separated by a first mylar sheet, the second lens 2a and the third lens 3 are separated by a first spacer, the third lens 3 and the fourth lens 4 are separated by a second spacer and a second mylar sheet, where the second spacer is in front of the diaphragm, and the diaphragm is the second mylar sheet, and the diaphragm surface is arranged on the rear surface of the second spacer; the fourth lens 4 and the fifth lens 5 are separated by a third spacer, the fifth lens 5 and the sixth lens 6 are separated by a fourth spacer; the sixth lens 6 and the seventh lens 7 are separated by a third mylar sheet.

[0026] In this embodiment, the glass refractive index N1 and the dispersion coefficient V1 of the first lens 1 and the glass refractive index N7 and the dispersion coefficient V7 of the seventh lens 7 satisfy the following relationship: 1.7 < N1 < N7 < 1.9, V1 ≤ 50, V7 ≤ 50; the glass refractive index N3 and the dispersion coefficient V3 of the third lens 3, the glass refractive index N5 and the dispersion coefficient V5 of the fifth lens 5, and the glass refractive index N6 and the dispersion coefficient V6 of the sixth lens 6 satisfy the following relationship: 1.4 < N5 = N6 < N3 < 1.6, V3 ≥ 90, V5 ≥ 90, V6 ≥ 90. Preferably, the glass refractive index of the first lens is 1.77 and the dispersion coefficient is 49.6; the glass refractive index of the third lens is 1.46 and the dispersion coefficient is 90.27; the glass refractive index of the fifth lens and the sixth lens is 1.44 and the dispersion coefficient is 94.52; the glass refractive index of the seventh lens is 1.88 and the dispersion coefficient is 40.85.

[0027] In this embodiment, the focal length F1 of the first lens 1 and the focal length F of the ultraviolet lens satisfy the following relationship: -0.8 < F1 / F < -0.7; preferably, F1 / F = -0.77.

[0028] In this embodiment, the focal length F2 of the second lens to the seventh lens 7 and the focal length F of the ultraviolet lens satisfy the following relationship: 0.8 < F2 / F < 1.0; preferably, F2 / F = 0.924.

[0029] In this embodiment, the optical total length T of the optical structure and the target surface size D satisfy the following relationship: 2.8 < T / D < 3.3; preferably, T / D = 3.19.

[0030] In this embodiment, the center distance between the object side and the image side of the first lens 1 is 0.25 mm, and the center distance between the image side of the first lens 1 and the object side of the second lens is 0.31 mm; the center distance between the object side and the image side of the second lens is 1.55 mm, and the center distance between the image side of the second lens and the object side of the third lens 3 is 0.026 mm; the center distance between the object side and the image side of the third lens 3 is 0.65 mm, and the center distance between the image side of the third lens 3 and the center of the aperture 9 is 0.026 mm; the center distance between the aperture 9 and the object side of the fourth lens 4 is 0.016 mm; the center distance between the object side and the image side of the fourth lens 4 is 0.3 mm, and the center distance between the image side of the fourth lens 4 and the object side of the fifth lens 5 is 0.034 mm; the center distance between the object side and the image side of the fifth lens 5 is 0.7 mm, and the center distance between the image side of the fifth lens 5 and the object side of the sixth lens 6 is 0.014 mm; the center distance between the object side and the image side of the sixth lens 6 is 0.778 mm, and the center distance between the image side of the sixth lens 6 and the object side of the seventh lens 7 is 0.08 mm; the center distance between the object side and the image side of the seventh lens 7 is 0.25 mm.

[0031] In this embodiment, the working wavelength range of the ultraviolet lens is 350 - 1000 nm.

[0032] In this embodiment, a protective glass 8 is provided at the front end of the ultraviolet lens.

[0033] In this embodiment, the parameters of each lens are (r1 refers to the surface curvature radius in the object plane direction along the optical path, r2 refers to the surface curvature radius in the image plane direction along the optical path, D refers to the center thickness. Unit: mm):

[0034] First lens: r1 = ∞; r2 = 0.710; material: H-LAF50B; D = 1.7;

[0035] Second lens: r1 = ∞; r2 = ∞; material: H-ZLAF68C; D = 1.7;

[0036] Third lens: r1 = 1.738; r2 = -1.738; material: H-FK71; D = 1.4;

[0037] Fourth lens: r1 = ∞; r2 = ∞; Material: H-K9L; D = 1.4;

[0038] Fifth lens: r1 = 1.916; r2 = -4.357; Material: H-FK95N; D = 1.4;

[0039] Sixth lens: r1 = 1.654; r2 = -1.281; Material: H-FK95N; D = 1.4;

[0040] Seventh lens: r1 = -0.989; r2 = 13.343; Material: H-ZLAF68C; D = 1.4.

[0041] In this embodiment, the lens specifications output by the optical structure of the ultraviolet lens are as follows:

[0042] Image plane size: Φ2.1 mm;

[0043] Viewing angle: 0° / 90°;

[0044] Focal length: 1.19 mm;

[0045] Relative aperture: 5;

[0046] Working distance: 19 mm;

[0047] Working wavelength: 350 - 1000 nm;

[0048] Optical total length: 6.7 mm.

[0049] The advantages of the present utility model are as follows:

[0050] (1) Each lens uses a material with strong ultraviolet transmittance (ultraviolet high-transmission optical glass), enabling the lens to have high-resolution performance in the working wavelength range of 350 - 1000 nm;

[0051] (2) The fourth lens is a filter, and by simply changing different filters, the endoscope can clearly see the state in a microscopic environment under different light source wavelengths, eliminating the need to design multiple lenses, effectively reducing design and development costs, and improving the performance and efficiency of the endoscope lens;

[0052] (3) The second lens is a replaceable lens, and by simply replacing the second lens and the lens barrel, the endoscope can meet the requirements for different viewing angles, effectively reducing design and development costs, and improving the performance and efficiency of the endoscope lens.

[0053] Example two: As Figure 2As shown, the difference between this embodiment and the first embodiment is only that: the second lens is a 90° turning prism 2b, and at the same time, the barrel 10 of the ultraviolet lens is adaptively adjusted according to the shape of the 90° turning prism 2b. With such a setting, a 90° turn of the viewing angle of the endoscope is achieved, that is, it is a 90° ultraviolet lens at this time.

[0054] If the present utility model discloses or involves components or structural parts that are fixedly connected to each other, then, unless otherwise stated, the fixed connection can be understood as: a detachable fixed connection (for example, connected by bolts or screws), or can also be understood as: a non-detachable fixed connection (for example, riveting, welding). Of course, the mutual fixed connection can also be replaced by an integral structure (for example, manufactured by an integral casting process) (except where it is clearly impossible to use the integral forming process).

[0055] In addition, in any of the technical solutions disclosed in the present utility model above, the terms used to represent the positional relationship or shape, unless otherwise stated, include states or shapes that are approximate, similar, or close to them.

[0056] Any component provided by the present utility model can either be assembled from a plurality of separate components or be a single component manufactured by an integral forming process.

[0057] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present utility model and not to limit them; although the present utility model has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that: it is still possible to modify the specific implementation manners of the present utility model or perform equivalent replacements for some technical features; without departing from the spirit of the technical solutions of the present utility model, they should all be covered within the scope of the technical solutions claimed by the present utility model.

Claims

1. A UV lens, characterized in that: The optical structure of the ultraviolet lens is sequentially provided with a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens along the optical axis from the object plane to the image plane. The first lens is a plano-concave lens with the concave surface facing the image side. The second lens is a replaceable turning rod lens. The fourth lens is a replaceable filter. The third lens, the fifth lens, and the sixth lens are all biconvex lenses. The seventh lens is a biconcave lens. A diaphragm is provided between the third lens and the fourth lens.

2. The ultraviolet lens according to claim 1, characterized in that: The second lens is a 0° turning rod lens or a 90° turning prism.

3. The ultraviolet lens according to claim 1, characterized in that: The first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens are all made of ultraviolet highly transmissive optical glass.

4. The ultraviolet lens according to claim 3, characterized in that: The materials of the second lens and the seventh lens are the same, and the materials of the fifth lens and the sixth lens are the same. When the thickness of all lenses is 0.25 mm in the state of a 370 nm wavelength, the internal transmittance of the ultraviolet lens is greater than 0.

99.

5. The ultraviolet lens according to claim 3, characterized in that: The glass refractive index N1 and the dispersion coefficient V1 of the first lens and the glass refractive index N7 and the dispersion coefficient V7 of the seventh lens satisfy the following relationship: 1.7 < N1 < N7 < 1.9, V1 ≤ 50, V7 ≤ 50. The glass refractive index N3 and the dispersion coefficient V3 of the third lens, the glass refractive index N5 and the dispersion coefficient V5 of the fifth lens, and the glass refractive index N6 and the dispersion coefficient V6 of the sixth lens. Satisfy the following relationship: 1.4 < N5 = N6 < N3 < 1.6, V3 ≥ 90, V5 ≥ 90, V6 ≥ 90.

6. The ultraviolet lens according to claim 3, characterized in that: The focal length F1 of the first lens and the focal length F of the ultraviolet lens satisfy the following relationship: -0.8 < F1 / F < -0.

7. The focal lengths F2 of the second lens to the seventh lens and the focal length F of the ultraviolet lens satisfy the following relationship: 0.8 < F2 / F < 1.

0.

7. The ultraviolet lens according to claim 1, characterized in that: The optical total length T of the optical structure and the target surface size D satisfy the following relationship: 2.8 < T / D < 3.

3.

8. The ultraviolet lens according to claim 1, characterized in that: The center distance between the object side surface and the image side surface of the first lens is 0.25mm, and the center distance between the image side surface of the first lens and the object side surface of the second lens is 0.31mm; the center distance between the object side surface and the image side surface of the second lens is 1.55mm, and the center distance between the image side surface of the second lens and the object side surface of the third lens is 0.026mm; the center distance between the object side surface and the image side surface of the third lens is 0.65mm, and the center distance between the image side surface of the third lens and the aperture is 0.026mm; the center distance between the aperture and the object side surface of the fourth lens is 0.016mm; The center distance between the object side surface and the image side surface of the four lenses is 0.3mm, and the center distance between the image side surface of the fourth lens and the object side surface of the fifth lens is 0.034mm; the center distance between the object side surface and the image side surface of the fifth lens is 0.7mm, and the center distance between the image side surface of the fifth lens and the object side surface of the sixth lens is 0.014mm; the center distance between the object side surface and the image side surface of the sixth lens is 0.778mm, and the center distance between the image side surface of the sixth lens and the object side surface of the seventh lens is 0.08mm; the center distance between the object side surface and the image side surface of the seventh lens is 0.25mm.

9. The ultraviolet lens according to claim 1, characterized in that: The working wavelength band of the ultraviolet lens is 350-1000nm.

10. The ultraviolet lens according to claim 1, characterized in that: A protective sheet is arranged at the front end of the ultraviolet lens.

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