Optical bayonet lens group adaptive to different beam splitter prism cameras
By designing an optical mount lens group that adapts to different beam splitter cameras, the lens system consists of the first to sixth lenses, with adjustable materials and shapes, solving the single adaptability problem in existing technologies and achieving high-quality imaging and multi-scene adaptability.
Patent Information
- Application Number
- CN202423135294.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-19
- Publication Date
- 2025-12-05
- Estimated Expiration
- 2034-12-19
Smart Images
Figure CN223637822U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a kind of optical bayonet lens groups suitable for different light splitting prism cameras. BACKGROUND
[0002] Medical endoscope is applied to minimally invasive surgery and medical diagnosis and examination, mainly by endoscope camera system and hard mirror, and the hard mirror is connected to the optical bayonet on endoscope camera system.In clinical use, doctors can use natural body orifice or open small incision on body to extend hard mirror into body, and then observe in-vivo from outside through endoscope camera system.
[0003] However, the optical bayonet lens of existing medical endoscope can only adapt to the camera of single light splitting prism, and has great use limitation. UTILITY MODEL CONTENT
[0004] The utility model makes improvement in view of the above prior art problem, that is, the technical problem to be solved by the utility model is to provide a kind of optical bayonet lens groups suitable for different light splitting prism cameras.
[0005] In order to realize the above purpose, the technical scheme adopted by the utility model is: a kind of optical bayonet lens groups suitable for different light splitting prism cameras, the optical system of optical bayonet lens group is sequentially first lens, second lens, third lens, fourth lens, fifth lens and sixth lens from object side to image side along optical axis, the first lens is positive meniscus lens, the second lens is double concave lens, the third lens is double convex lens, the second lens and the third lens are combined as first double cemented lens, the fourth lens is double concave lens, the fifth lens is double convex lens, the fourth lens and the fifth lens are combined as second double cemented lens, the sixth lens is negative meniscus lens and can be replaced according to different light splitting prism, the refractive index of sixth lens is greater than 1.6 in air medium, and Abbe number is less than 60;the refractive index of sixth lens is less than 1.6 in H-LAF50B medium, and Abbe number is greater than 60.
[0006] Further, the object side of first lens is concave, and the image side is convex;The object side and image side of second lens are both concave;The object side and image side of third lens are both convex;The object side and image side of fourth lens are both concave;The object side and image side of fifth lens are both convex;The object side of sixth lens is concave, and the image side is convex.
[0007] Further, the absolute value of the focal length of the first lens is 8mm-10mm; the small concave surface of the second lens faces the object plane end, and the absolute value of the focal length is 4mm-6mm; the small convex surface of the third lens faces the object plane end, and the absolute value of the focal length is 8mm-10mm; the absolute value of the focal length of the first double cemented lens is 550mm-570mm; the absolute value of the focal length of the fourth lens is 8mm-10mm; the absolute value of the focal length of the fifth lens is 8mm-10mm; the absolute value of the focal length of the second double cemented lens is 25mm-40mm; and the absolute value of the focal length of the sixth lens is 10mm-30mm.
[0008] Further, the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are all spherical lenses made of glass material.
[0009] Further, the first lens adopts H-ZLAF52A as the material, and the refractive index is 1.806100; the second lens adopts H-TF5 as the material, and the refractive index is 1.654100; the third lens adopts H-ZBAF3 as the material, and the refractive index is 1.656910; the fourth lens adopts H-LAF6LA as the material, and the refractive index is 1.757000; the fifth lens adopts H-FK61 as the material, and the refractive index is 1.497000; and the material of the sixth lens is replaced according to different light splitting prisms.
[0010] Further, the air interval between the first lens and the second lens is 0.95mm; the air interval between the third lens and the fourth lens is 0.2mm; and the air interval between the fifth lens and the sixth lens is 0.4-0.6mm.
[0011] Compared with the prior art, the utility model has the following effects: the utility model discloses reasonable in design, and the sixth lens is slightly changed, and the light splitting prism camera of different medium can be matched;Meanwhile, through specific surface shape collocation, the aberration is balanced reasonably, stray light is eliminated, and the imaging quality is good. BRIEF DESCRIPTION OF DRAWINGS
[0012] Figure 1 It is the structure schematic diagram of optical system in the embodiment of the utility model;
[0013] Figure 2 It is the structure schematic diagram in air medium of the embodiment of the utility model;
[0014] Figure 3 It is the MTF curve diagram in air medium of the embodiment of the utility model;
[0015] Figure 4 It is the structure schematic diagram in H-LAF50B medium of the embodiment of the utility model;
[0016] Figure 5 is the MTF curve diagram of the H-LAF50B medium of the embodiment of the present application.
[0017] In the figure:
[0018] 1 - first lens; 2 - second lens; 3 - third lens; 4 - fourth lens; 5 - fifth lens; 6 - sixth lens; 7 - air medium light splitting prism camera; 8 - H-LAF50B medium light splitting prism camera. DETAILED DESCRIPTION:
[0019] The present application will be further described in detail below in conjunction with the drawings and specific embodiments.
[0020] In the description of the present application, it should be understood that the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the present application.
[0021] As Figure 1 shown, the optical bayonet lens group of the present application is adapted to different light splitting prism cameras, and the purpose is to provide an optical bayonet adapted to different light splitting prism cameras, which has the function of adapting to multiple scenes, specifically: the optical system of the optical bayonet lens group is sequentially arranged along the optical axis from the object side to the image side direction as first lens, second lens, third lens, fourth lens, fifth lens and sixth lens, the first lens is a positive meniscus lens, the second lens is a double concave lens, the third lens is a double convex lens, the second lens and the third lens are combined as a first double cemented lens, the fourth lens is a double concave lens, the fifth lens is a double convex lens, the fourth lens and the fifth lens are combined as a second double cemented lens, the sixth lens is a negative meniscus lens, the material of the sixth lens can be replaced according to different light splitting prisms, when in air medium, the refractive index of the sixth lens is greater than 1.6, and the Abbe number is less than 60; when in H-LAF50B medium, the refractive index of the sixth lens is less than 1.6, and the Abbe number is greater than 60. By slightly changing the sixth lens, different medium light splitting prism cameras can be matched; at the same time, through the specific surface shape matching, the aberration is balanced reasonably, the stray light is eliminated, and the imaging quality is good, etc.
[0022] In the embodiment, the object side of the first lens is concave, and the image side is convex; the object side and the image side of the second lens are both concave; the object side and the image side of the third lens are both convex; the object side and the image side of the fourth lens are both concave; the object side and the image side of the fifth lens are both convex; the object side of the sixth lens is concave, and the image side is convex.
[0023] In the embodiment, the absolute value of the focal length of the first lens is 8mm-10mm; the small concave surface of the second lens faces the object side, and the absolute value of the focal length is 4mm-6mm; the small convex surface of the third lens faces the object side, and the absolute value of the focal length is 8mm-10mm; the absolute value of the focal length of the first double cemented lens is 550mm-570mm; the absolute value of the focal length of the fourth lens is 8mm-10mm; the absolute value of the focal length of the fifth lens is 8mm-10mm; the absolute value of the focal length of the second double cemented lens is 25mm-40mm; and the absolute value of the focal length of the sixth lens is 10mm-30mm.
[0024] In the embodiment, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens are all spherical lenses made of glass material.
[0025] In the embodiment, when matched with different light-splitting prism cameras, the first lens adopts material H-ZLAF52A with a refractive index of 1.806100; the second lens adopts material H-TF5 with a refractive index of 1.654100; the third lens adopts material H-ZBAF3 with a refractive index of 1.656910; the fourth lens adopts material H-LAF6LA with a refractive index of 1.757000; the fifth lens adopts material H-FK61 with a refractive index of 1.497000; and the sixth lens material is replaced according to different light-splitting prisms, with a refractive index greater than 1.6 and an Abbe number less than 60 in air medium, and a refractive index less than 1.6 and an Abbe number greater than 60 in H-LAF50 medium, so as to correct chromatic aberration and make the imaging quality good. When matched with different light-splitting prism cameras, the material shape, curvature radius, etc. of the first lens, the second lens, the third lens, the fourth lens, and the fifth lens remain unchanged.
[0026] In the embodiment, the air gap between the first lens and the second lens is 0.95mm; the air gap between the third lens and the fourth lens is 0.2mm; and the air gap between the fifth lens and the sixth lens is 0.4-0.6mm.
[0027] Embodiment 1: For the air medium light-splitting prism camera 7, the structure is as shown in Figure 2As shown, an optical nose group suitable for different spectrometer prism cameras is provided, including six lenses, and the optical system of the optical nose group is sequentially arranged along the optical axis from the object side to the image side as a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens, and the second lens and the third lens are combined as a first doublet lens, and the fourth lens and the fifth lens are combined as a second doublet lens.
[0028] The first lens is a positive meniscus lens, the object side surface of which is concave, and the image side surface of which is convex, and the focal length value is 9.9mm.
[0029] The second lens is a double concave lens, and the object side surface and the image side surface of which are both concave, and the small concave surface faces the object side end, and the focal length value is -5.626mm.
[0030] The third lens is a double convex lens, and the object side surface and the image side surface of which are both convex, and the small convex surface faces the object side end, and the focal length value is 8.938mm.
[0031] The fourth lens is a double concave lens, and the object side surface and the image side surface of which are both concave, and the focal length value is -9.7mm.
[0032] The fifth lens is a double convex lens, and the object side surface and the image side surface of which are both convex, and the focal length value is 8.9mm.
[0033] The sixth lens is a negative meniscus lens, the object side surface of which is concave, and the image side surface of which is convex, and the focal length value is -27.893mm.
[0034] The focal length value of the first doublet lens is 565.5mm, and the focal length value of the second doublet lens is 31.6mm.
[0035] In the embodiment, the first lens adopts H-ZLAF52A as the material, and the refractive index is 1.806100; the second lens adopts H-TF5 as the material, and the refractive index is 1.654100; the third lens adopts H-ZBAF3 as the material, and the refractive index is 1.656910; the fourth lens adopts H-LAF6LA as the material, and the refractive index is 1.757000; the fifth lens adopts H-FK61 as the material, and the refractive index is 1.497000; and the sixth lens adopts H-ZK4 as the material, and the refractive index is 1.608810, and the Abbe number is 58.855990.
[0036] In the embodiment, the first lens has a curvature radius R1 of 64.274, a R2 of 7.253, and a center thickness of 2.37 mm; the second lens has a curvature radius R1 of 4.451, a R2 of 29.635, and a center thickness of 3.75 mm; the third lens has a curvature radius R1 of 29.635, a R2 of 7.079, and a center thickness of 3.03 mm; the fourth lens has a curvature radius R1 of 32.511, a R2 of 9.927, and a center thickness of 2.71 mm; the fifth lens has a curvature radius R1 of 9.927, a R2 of 7.011, and a center thickness of 3.65 mm; and the sixth lens has a curvature radius R1 of 6.391, a R2 of 11.948, and a center thickness of 2.84 mm.
[0037] The embodiment is applied to the case of air medium 7 between the lens and the camera, as shown in the optical system. Figure 3 The MTF of the optical system is close to the diffraction limit.
[0038] Embodiment 2: For a H-LAF50B medium splitting prism camera 8, as shown in the structure, Figure 4 An optical socket lens group suitable for different splitting prism cameras is provided, which includes six lenses. The optical system of the optical socket lens group is sequentially arranged along the optical axis from the object side to the image side as a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. The second lens and the third lens are combined as a first doublet lens. The fourth lens and the fifth lens are combined as a second doublet lens.
[0039] The first lens is a positive meniscus lens, the object side surface of which is concave, and the image side surface of which is convex. The focal length value is 9.9 mm.
[0040] The second lens is a double concave lens, the object side surface and the image side surface of which are both concave. The small concave surface faces the object side end. The focal length value is -5.626 mm.
[0041] The third lens is a double convex lens, the object side surface and the image side surface of which are both convex. The small convex surface faces the object side end. The focal length value is 8.938 mm.
[0042] The fourth lens is a double concave lens, the object side surface and the image side surface of which are both concave. The focal length value is -9.7 mm.
[0043] The fifth lens is a double convex lens, the object side surface and the image side surface of which are both convex. The focal length value is 8.9 mm.
[0044] The sixth lens is a negative meniscus lens, the object side surface of which is concave, and the image side surface of which is convex. The focal length value is -12.828 mm.
[0045] The focal length value of the first doublet lens is 565.5 mm, and the focal length value of the second doublet lens is 31.6 mm.
[0046] In the embodiment, the first lens adopts H-ZLAF52A as the material, the refractive index is 1.806100; the second lens adopts H-TF5 as the material, the refractive index is 1.654100; the third lens adopts H-ZBAF3 as the material, the refractive index is 1.656910; the fourth lens adopts H-LAF6LA as the material, the refractive index is 1.757000; the fifth lens adopts H-FK61 as the material, the refractive index is 1.497000; the sixth lens adopts H-K1 as the material, the refractive index is 1.499670, and the Abbe number is 62.071978.
[0047] In the embodiment, the first lens has a curvature radius R1 of 64.274, a R2 of 7.253, and a center thickness of 2.37mm; the second lens has a curvature radius R1 of 4.451, a R2 of 29.635, and a center thickness of 3.75mm; the third lens has a curvature radius R1 of 29.635, a R2 of 7.079, and a center thickness of 3.03mm; the fourth lens has a curvature radius R1 of 32.511, a R2 of 9.927, and a center thickness of 2.71mm; the fifth lens has a curvature radius R1 of 9.927, a R2 of 7.011, and a center thickness of 3.65mm; and the sixth lens has a curvature radius R1 of 6.435, a R2 of 17.084, and a center thickness of 0.797mm.
[0048] The embodiment is applied to the case that the H-LAF50B medium exists in the spectrometer prism camera, and the MTF of the optical system as shown in the figure approaches the diffraction limit. Figure 5
[0049] If the utility model discloses or involves mutually fixed connection parts or structural members, then, except for another declaration, fixed connection can be understood as: detachable fixed connection (for example, using bolt or screw connection), also can be understood as: non-detachable fixed connection (for example, riveting, welding), of course, mutual fixed connection can also be replaced by integral structure (for example, using casting process integral forming manufacturing) (obviously, cannot adopt integral forming process except).
[0050] In addition, the meaning of the term for indicating position relationship or shape in any technical solution disclosed by the utility model includes approximate, similar or close state or shape except for another declaration.
[0051] Any part provided by the utility model can be assembled by a plurality of individual components, or can be an individual component manufactured by integral forming process.
[0052] It should be noted that the above examples are used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the specific embodiments of the present application can be modified or some technical features can be replaced by equivalent ones; without departing from the spirit of the technical solutions of the present application, they should be covered in the technical solution range of the present application claimed.
Claims
1. An optical nosepiece lens group adapted to different spectrometer prism cameras, characterized in that: The optical system of the optical nosepiece lens group comprises, in order from the object side to the image side along the optical axis, a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens, the first lens is a positive meniscus lens, the second lens is a double-concave lens, the third lens is a double-convex lens, the second lens and the third lens are combined into a first doublet, the fourth lens is a double-concave lens, the fifth lens is a double-convex lens, the fourth lens and the fifth lens are combined into a second doublet, the sixth lens is a negative meniscus lens and can be replaced according to different light splitting prisms, the refractive index of the sixth lens is greater than 1.6 and the Abbe number is less than 60 in air medium, and the refractive index of the sixth lens is less than 1.6 and the Abbe number is greater than 60 in H-LAF50B medium.
2. The optical nosepiece lens group of claim 1, wherein: The object side of the first lens is concave, and the image side is convex; the object side and the image side of the second lens are both concave; the object side and the image side of the third lens are both convex; the object side and the image side of the fourth lens are both concave; the object side and the image side of the fifth lens are both convex; the object side of the sixth lens is concave, and the image side is convex.
3. The optical nosepiece lens group of claim 1, wherein: The absolute value of the focal length of the first lens is 8mm-10mm; the small concave surface of the second lens faces the object side, and the absolute value of the focal length is 4mm-6mm; the small convex surface of the third lens faces the object side, and the absolute value of the focal length is 8mm-10mm; the absolute value of the focal length of the first doublet is 550mm-570mm; the absolute value of the focal length of the fourth lens is 8mm-10mm; the absolute value of the focal length of the fifth lens is 8mm-10mm; the absolute value of the focal length of the second doublet is 25mm-40mm; and the absolute value of the focal length of the sixth lens is 10mm-30mm.
4. The optical nosepiece lens group of claim 1, wherein: The first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are all spherical lenses made of glass material.
5. The optical nosepiece lens group of claim 1, wherein: The first lens adopts H-ZLAF52A material with a refractive index of 1.806100; the second lens adopts H-TF5 material with a refractive index of 1.654100; the third lens adopts H-ZBAF3 material with a refractive index of 1.656910; the fourth lens adopts H-LAF6LA material with a refractive index of 1.757000; the fifth lens adopts H-FK61 material with a refractive index of 1.497000; and the sixth lens material is replaced according to different light splitting prisms.
6. The optical nosepiece lens group of claim 1, wherein: The air gap between the first lens and the second lens is 0.95mm; the air gap between the third lens and the fourth lens is 0.2mm; and the air gap between the fifth lens and the sixth lens is 0.4-0.6mm.