Small-size high-illumination high-definition prime lens
By designing a small-volume, high-illuminance, high-resolution high-definition fixed-focus lens, combined with a vision inspection system, the problem of low automation in traditional dispensing machines has been solved, achieving high-quality imaging and precise dispensing effects over a wide working distance range.
Patent Information
- Application Number
- CN202423161272.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-20
- Publication Date
- 2025-12-05
- Estimated Expiration
- 2034-12-20
AI Technical Summary
Traditional dispensing machines have a low degree of automation, making it difficult to adapt to workpieces with complex shapes. Furthermore, the dispensing accuracy is affected by workpiece position deviation, deformation, and temperature changes, making it difficult to meet the needs of high-end precision manufacturing.
Design a small-volume, high-illuminance, high-resolution high-definition fixed-focus lens, which adopts a combination of four groups of five-element spherical lenses. The front lens group, aperture group, and rear lens group move along the optical axis to achieve an optical imaging range of 250mm to infinity. Combined with a high-resolution vision inspection system, the dispensing accuracy is improved.
It achieves high-quality imaging over a wide working distance range, improving the automated production efficiency and product quality of dispensing machines, and adapting to the precision manufacturing needs of complex-shaped workpieces.
Smart Images
Figure CN223637803U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a small volume high illumination high definition fixed focus lens. BACKGROUND
[0002] With the upgrading of manufacturing industry and the expansion of emerging fields, the point glue machine has become an important tool to improve product quality and production efficiency on the production line, especially in the fields of electronics, automobiles, aerospace, medical treatment and the like, and the demand is expanding. According to industry analysis, the global point glue machine market reached 5.7 million US dollars in sales in 2023, and is expected to reach 8.5 million US dollars by 2030, with a compound annual growth rate of 5.3%. With the intensification of domestic competition, the point glue machine industry also faces urgent transformation and upgrading. The traditional point glue machine has low automation degree, low applicability to complex-shaped workpieces, and is easily affected by workpiece position deviation, deformation and temperature change, resulting in reduced point glue precision, which is difficult to meet the demand of higher-order precision manufacturing. Therefore, a more intelligent visual point glue machine is born. Compared with the traditional point glue machine, the visual point glue machine increases a high-precision visual detection system, accurately identifies the position and shape of the area to be glued through vision, and easily captures micron-level details through high-resolution visual lenses and image algorithms, making production more intelligent, flexible and efficient, thereby improving automation production efficiency and product quality.
[0003] In the future, with the continuous innovation of point glue machine technology, the point glue machine will also be expanded to spraying, optical detection, LED and other fields, further widening the application scenarios and promoting the development of higher precision machine vision. Therefore, it is meaningful to design a small volume, high illumination and high resolution optical system to cooperate with the continuously widening application scenarios of the visual point glue machine. CONTENT OF THE UTILITY MODEL
[0004] In order to solve the above problems, the technical problem to be solved by the utility model is to provide a small volume, high illumination and high definition fixed focus lens and its collocation, which has the advantages of small volume, high illumination, high resolution and low distortion, and can realize high-quality imaging in a wide working distance range.
[0005] The utility model is constituted as follows: it comprises front lens group, diaphragm group, rear lens group and imaging group arranged in sequence from object side to image side; the front lens group comprises double convex lens L1, meniscus lens L2 and double concave lens L3; the rear lens group comprises meniscus lens L4 and double convex lens L5.
[0006] Further, the imaging group comprises plane lens L6 and imaging surface L7.
[0007] Further, the air distance from the front lens group to the rear lens group is 6.39 mm; the air distance from the front lens group to the diaphragm group is 3.39 mm; and the air distance from the diaphragm group to the rear lens group is 3.0 mm.
[0008] Further, the total optical power of the front lens group is positive, and the total optical power of the rear lens group is positive.
[0009] Further, the optical power of the lenticular lens L1 is positive, the object side surface thereof is convex, and the image side surface thereof is convex; the optical power of the meniscus lens L2 is positive, the object side surface thereof is convex, and the image side surface thereof is concave; the optical power of the biconcave lens L3 is negative, the object side surface thereof is concave, and the image side surface thereof is concave; the optical power of the meniscus lens L4 is negative, the object side surface thereof is convex, and the image side surface thereof is concave; and the optical power of the lenticular lens L5 is positive, the object side surface thereof is convex, and the image side surface thereof is convex.
[0010] Further, in the front lens group, the air distance from the lenticular lens L1 to the meniscus lens L2 is 0.1 mm; the air distance from the meniscus lens L2 to the biconcave lens L3 is 0.56 mm;
[0011] Further, in the imaging group, the air distance from the plane lens to the imaging surface is 0.2 mm.
[0012] Further, the total focal length of the optical system is set as f, the focal length of the lenticular lens L1 is set as f1, the focal length of the meniscus lens L2 is set as f2, the focal length of the biconcave lens L3 is set as f3, the focal length of the meniscus lens L4 is set as f4, and the focal length of the lenticular lens L5 is set as f5, the ratio of f1 to f satisfies the relationship: 0.68 < |f1 / f| < 0.94; the ratio of f2 to f satisfies the relationship: 1.94 < |f2 / f| < 2.74; the ratio of f3 to f satisfies the relationship: 0.26 < |f3 / f| < 0.43; the ratio of f4 to f satisfies the relationship: 1.30 < |f4 / f| < 15.32; and the ratio of f5 to f satisfies the relationship: 0.55 < |f5 / f| < 1.09.
[0013] Further, the biconvex lens L1 has a refractive index n1 and an Abbe number V1, which satisfy the relationship: 1.57 < n1 < 1.62, 66.0 < V1 < 71.0; the meniscus lens L2 has a refractive index n2 and an Abbe number V2, which satisfy the relationship: 1.66 < n2 < 1.71, 48.0 < V2 < 60.0; the biconcave lens L3 has a refractive index n3 and an Abbe number V3, which satisfy the relationship: 1.65 < n3 < 1.95, 32.0 < V3 < 36.0; the meniscus lens L4 has a refractive index n4 and an Abbe number V4, which satisfy the relationship: 1.65 < n4 < 1.95, 24.0 < V4 < 28.0; the biconvex lens L5 has a refractive index n5 and an Abbe number V5, which satisfy the relationship: 1.80 < n5 < 2.05, 38.0 < V5 < 42.0.
[0014] Further, in the rear lens group, the meniscus lens L4 and the biconvex lens L5 are bonded as a cemented lens group.
[0015] Compared with the prior art, the optical system of the utility model has the following beneficial effects: the optical system of the utility model selects four groups of five-piece spherical lens combination, which is simple in structure, small in size, wherein the imaging group is fixed relative to the optical axis, the front lens group, the diaphragm group and the rear lens group move forward and backward along the optical axis to complete focusing at different object distances, so that the optical imaging range of 250mm-infinity is realized, and the advantages of small size, high illumination, high resolution and low distortion are achieved, and high-quality imaging can be achieved in a wide working distance range. BRIEF DESCRIPTION OF DRAWINGS
[0016] Figure 1 is the optical path structure schematic diagram of the imaging system of the utility model embodiment;
[0017] Figure 2 is the 250mm object distance transfer function curve diagram of the utility model embodiment;
[0018] Figure 3 is the 500mm object distance transfer function curve diagram of the utility model embodiment;
[0019] Figure 4 is the 1000mm object distance transfer function curve diagram of the utility model embodiment;
[0020] Figure 5 is the infinity object distance transfer function curve diagram of the utility model embodiment;
[0021] Figure 6 is the 250mm object distance relative illumination curve diagram of the utility model embodiment;
[0022] Figure 7 is the 500mm object distance relative illumination curve diagram of the utility model embodiment;
[0023] Figure 8 This is a relative illuminance curve at a 1000mm object distance according to an embodiment of this utility model;
[0024] Figure 9 This is a relative illumination curve of an object at infinity according to an embodiment of this utility model;
[0025] Figure 10 This is a field curve diagram with a 250mm object distance according to an embodiment of this utility model;
[0026] Figure 11 This is a 250mm distortion curve diagram of an embodiment of this utility model;
[0027] Figure 12 This is a field curve diagram with a 500mm object distance according to an embodiment of this utility model;
[0028] Figure 13 This is a 500mm distortion curve diagram of an embodiment of this utility model;
[0029] Figure 14 This is a field curve diagram of a 1000mm object distance according to an embodiment of this utility model;
[0030] Figure 15 This is a 1000mm distortion curve diagram of an embodiment of this utility model;
[0031] Figure 16 This is a field curve diagram of an object at infinity distance according to an embodiment of this utility model;
[0032] Figure 17 This is an infinity distortion curve diagram of an embodiment of this utility model. Detailed Implementation
[0033] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.
[0034] Example: Refer to Appendix Figures 1-17 As shown in the embodiment of this utility model, a small-volume, high-illumination, high-definition fixed-focus lens includes a front lens group, an aperture group, a rear lens group, and an imaging group arranged sequentially from the object side to the image side; the front lens group includes a biconvex lens L1, a meniscus lens L2, and a biconcave lens L3; the rear lens group includes a meniscus lens L4 and a biconvex lens L5.
[0035] In this embodiment of the invention, the imaging group includes a planar lens L6 and an imaging surface L7.
[0036] The optical system imaging group is fixed relative to the optical axis, and the front lens group, the diaphragm group and the rear lens group are moved forward and backward along the optical axis to complete different object distance focusing, so that the optical imaging range of 250mm-infinity is realized; wherein when the object distance is at infinity, the air distance from the rear lens group to the imaging group is 12.13mm; when the object distance is at 250mm, the air distance from the rear lens group to the imaging group is 14.76mm.
[0037] The optical system of the utility model selects four groups of five pieces of spherical lens combination, which is simple in structure, small in size, and the design process is reasonable in material selection and collocation, reasonable in optical power distribution, effectively optimizes the optical aberration, realizes the system high pixel resolution, low distortion and realizes high quality imaging in the whole working range.
[0038] In the embodiment of the utility model, the air distance from the front lens group to the rear lens group is 6.39mm; the air distance from the front lens group to the diaphragm group is 3.39mm; the air distance from the diaphragm group to the rear lens group is 3.0mm.
[0039] In the front lens group, the air distance from the lenticular lens L1 to the meniscus lens L2 is 0.1mm; the air distance from the meniscus lens L2 to the biconcave lens L3 is 0.56mm;
[0040] In the imaging group, the air distance from the plane lens to the imaging surface is 0.2mm.
[0041] In the embodiment of the utility model, the total optical power of the front lens group is positive, and the total optical power of the rear lens group is positive.
[0042] In the embodiment of the utility model, the optical power of the lenticular lens L1 is positive, the object side surface thereof is convex, and the image side surface thereof is convex; the optical power of the meniscus lens L2 is positive, the object side surface thereof is convex, and the image side surface thereof is concave; the optical power of the biconcave lens L3 is negative, the object side surface thereof is concave, and the image side surface thereof is concave; the optical power of the meniscus lens L4 is negative, the object side surface thereof is convex, and the image side surface thereof is concave; the optical power of the lenticular lens L5 is positive, the object side surface thereof is convex, and the image side surface thereof is convex.
[0043] In the embodiment of the utility model, the total focal length of the optical system is f, the focal length of the double convex lens L1 is f1, the focal length of the meniscus lens L2 is f2, the focal length of the double concave lens L3 is f3, the focal length of the meniscus lens L4 is f4, the focal length of the double convex lens L5 is f5, the ratio of f1 and f satisfies the relationship formula: 0.68 < |f1 / f| < 0.94, the ratio of f2 and f satisfies the relationship formula: 1.94 < |f2 / f| < 2.74, the ratio of f3 and f satisfies the relationship formula: 0.26 < |f3 / f| < 0.43, the ratio of f4 and f satisfies the relationship formula: 1.30 < |f4 / f| < 15.32, and the ratio of f5 and f satisfies the relationship formula: 0.55 < |f5 / f| < 1.09.
[0044] In the embodiment of the utility model, the refractive index of the double convex lens L1 is n1, and the Abbe number is V1, which satisfy the relationship formula: 1.57 < n1 < 1.62, 66.0 < V1 < 71.0; the refractive index of the meniscus lens L2 is n2, and the Abbe number is V2, which satisfy the relationship formula: 1.66 < n2 < 1.71, 48.0 < V2 < 60.0; the refractive index of the double concave lens L3 is n3, and the Abbe number is V3, which satisfy the relationship formula: 1.65 < n3 < 1.95, 32.0 < V3 < 36.0; the refractive index of the meniscus lens L4 is n4, and the Abbe number is V4, which satisfy the relationship formula: 1.65 < n4 < 1.95, 24.0 < V4 < 28.0; the refractive index of the double convex lens L5 is n5, and the Abbe number is V5, which satisfy the relationship formula: 1.80 < n5 < 2.05, 38.0 < V5 < 42.0.
[0045] In the embodiment of the utility model, in the rear lens group, the meniscus lens L4 and the double convex lens L5 are bonded into a cemented lens group; the diaphragm group is located between the double concave lens L3 and the cemented lens group, and the plane lens L6 is located between the cemented lens group and the imaging surface L7.
[0046] Specifically, in the rear lens group, the heavy flint meniscus lens and the heavy lanthanum flint double convex lens are bonded in sequence to form a cemented lens group; the meniscus lens L4 with negative focal power and the double convex lens L5 with positive focal power are combined, which reduces the reflection loss of light energy on the lens surface, improves the transmittance of light in the system, effectively improves the spherical aberration and chromatic aberration of the system, and ensures high-definition imaging of the system.
[0047] In the embodiment of the utility model, the double convex lens L1 selects heavy phosphor crown glass with high refractive index, low dispersion and good heat resistance, which can provide better optical performance and effectively ensure the imaging quality of the optical system.
[0048] In the embodiment of the utility model, the imaging system realizes the following technical indexes: f=25mm, relative aperture: F / #=2.8, image surface size ≤φ11mm, working wavelength: F.d.C (visible).
[0049] In the embodiment of the utility model, the parameters of each lens are shown in Table 1 as follows:
[0050]
[0051] Table 1
[0052] In the embodiment of the utility model, the optical system transfer function curve diagram is shown in the following figure: Figure 2 At 250mm object distance, MTF≥0.3@200lp / mm in the figure; as shown in the following figure: Figure 3 At 500mm object distance, MTF≥0.3@200lp / mm in the figure; as shown in the following figure: Figure 4 At 1000mm object distance, MTF≥0.3@200lp / mm in the figure; as shown in the following figure: Figure 5 At infinite object distance, MTF≥0.25@200lp / mm in the figure.
[0053] The optical system relative luminance curve diagram is shown in the following figure: Figure 6 At 250mm object distance, relative luminance≥90%@5.5mm image height in the figure; as shown in the following figure: Figure 7 At 500mm object distance, relative luminance≥90%@5.5mm image height in the figure; as shown in the following figure: Figure 8 At 1000mm object distance, relative luminance≥90%@5.5mm image height in the figure; as shown in the following figure: Figure 9 At infinite object distance, relative luminance≥85%@5.5mm image height in the figure.
[0054] The optical system field curvature and distortion curve diagram is shown in the following figure: Figure 10 , 11 At 250mm object distance, field curvature≤±0.05mm, optical distortion≤-0.1% in the figure; as shown in the following figure: Figure 12 , 13 At 500mm object distance, field curvature≤±0.05mm, optical distortion≤-0.1% in the figure; as shown in the following figure: Figure 14 , 15 At 1000mm object distance, field curvature≤±0.05mm, optical distortion≤0.15% in the figure; as shown in the following figure: Figure 16 , 17 At infinite object distance, field curvature≤±0.05mm, optical distortion≤0.15% in the figure.
[0055] Any of the above technical solutions of the utility model discloses, if it discloses numerical range except declaration, then the numerical range disclosed is preferred numerical range, and any person skilled in the art should understand that: preferred numerical range is only the numerical value that technical effect is obvious or representative in many implementable numerical values. Because the numerical value is more, cannot be exhausted, so the utility model discloses partial numerical value to illustrate the technical scheme of the utility model by example, and the numerical value enumerated above should not constitute the restriction of the protection scope of the utility model creation.
[0056] Meanwhile, the above utility model discloses or involves the mutual fixed connection of component or structural member, and except declaration, fixed connection can be understood as: the fixed connection of detachable (for example, the connection of bolt or screw), and also can be understood as: the fixed connection of undetachable (for example, riveting, welding), of course, the mutual fixed connection can be replaced by integral structure (for example, integrally formed by using casting process) (obviously, except for integral forming process).
[0057] If the words such as "first", "second" are used to limit components in this paper, those skilled in the art should know that: the use of "first", "second" is only for the convenience of describing the difference between components, and the above words have no special meaning unless otherwise stated.
[0058] In addition, the terms used to represent the position relationship or shape in any of the above technical solutions of the utility model disclosed include the state or shape similar, similar or close to it unless otherwise stated.
[0059] Any component provided by the utility model can be assembled by multiple individual components, or can be an individual component manufactured by integral forming process.
[0060] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the utility model and not to limit them; although the utility model has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that: the specific embodiments of the utility model can still be modified or some technical features can be replaced by equivalents; without departing from the spirit of the technical solutions of the utility model, they should be covered in the technical solution range of the utility model claimed.
Claims
1. A small volume high-illuminance high-definition fixed focus lens, characterized by, The optical system comprises, from the object side to the image side, a front lens group, a diaphragm group, a rear lens group and an imaging group; the front lens group comprises a double convex lens L1, a meniscus lens L2 and a double concave lens L3; the rear lens group comprises a meniscus lens L4 and a double convex lens L5.
2. The small- volume high-illuminance high-definition fixed-focus lens according to claim 1, characterized in that, The imaging group comprises a plane lens L6 and an imaging surface L7.
3. The small- volume high-illuminance high-definition fixed-focus lens according to claim 1, characterized in that, The air distance between the front lens group and the rear lens group is 6.39 mm; the air distance between the front lens group and the diaphragm group is 3.39 mm; and the air distance between the diaphragm group and the rear lens group is 3.0 mm.
4. The small- volume high-illuminance high-definition fixed-focus lens according to claim 1, characterized in that, The total optical power of the front lens group is positive, and the total optical power of the rear lens group is positive.
5. The small- volume high-illuminance high-definition fixed-focus lens according to claim 1, wherein, The double convex lens L1 has positive optical power, the object side surface of the double convex lens L1 is convex, and the image side surface of the double convex lens L1 is convex; the meniscus lens L2 has positive optical power, the object side surface of the meniscus lens L2 is convex, and the image side surface of the meniscus lens L2 is concave; the double concave lens L3 has negative optical power, the object side surface of the double concave lens L3 is concave, and the image side surface of the double concave lens L3 is concave; the meniscus lens L4 has negative optical power, the object side surface of the meniscus lens L4 is convex, and the image side surface of the meniscus lens L4 is concave; and the double convex lens L5 has positive optical power, the object side surface of the double convex lens L5 is convex, and the image side surface of the double convex lens L5 is convex.
6. The small- volume high-illuminance high-definition fixed-focus lens according to any one of claims 1-3, characterized in that, In the front lens group, the air distance between the double convex lens L1 and the meniscus lens L2 is 0.1 mm, and the air distance between the meniscus lens L2 and the double concave lens L3 is 0.56 mm.
7. The small- volume high-illuminance high-definition fixed-focus lens according to claim 2, characterized in that, In the imaging group, the air distance between the plane lens and the imaging surface is 0.2 mm.
8. The small- volume high-illuminance high-definition fixed-focus lens according to claim 1, characterized in that, The total focal length of the optical system is f, the focal length of the double convex lens L1 is f1, the focal length of the meniscus lens L2 is f2, the focal length of the double concave lens L3 is f3, the focal length of the meniscus lens L4 is f4, the focal length of the double convex lens L5 is f5, the ratio of f1 to f satisfies the relationship 0.68<|f1 / f|<0.94, the ratio of f2 to f satisfies the relationship 1.94<|f2 / f|<2.74, the ratio of f3 to f satisfies the relationship 0.26<|f3 / f|<0.43, the ratio of f4 to f satisfies the relationship 1.30<|f4 / f|<15.32, and the ratio of f5 to f satisfies the relationship 0.55<|f5 / f|<1.
09.
9. The small- volume high-illuminance high-definition fixed-focus lens according to claim 1, wherein, The refractive index of the double convex lens L1 is n1, and the Abbe number is V1, which satisfy the relationship 1.57<n1<1.62 and 66.0<V1<71.0; the refractive index of the meniscus lens L2 is n2, and the Abbe number is V2, which satisfy the relationship 1.66<n2<1.71 and 48.0<V2<60.0; the refractive index of the double concave lens L3 is n3, and the Abbe number is V3, which satisfy the relationship 1.65<n3<1.95 and 32.0<V3<36.0; the refractive index of the meniscus lens L4 is n4, and the Abbe number is V4, which satisfy the relationship 1.65<n4<1.95 and 24.0<V4<28.0; and the refractive index of the double convex lens L5 is n5, and the Abbe number is V5, which satisfy the relationship 1.80<n5<2.05 and 38.0<V5<42.
0.
10. The small- volume high-illuminance high-definition fixed-focus lens according to claim 1, characterized in that, In the rear lens group, the meniscus lens L4 and the double convex lens L5 are bonded as a cemented lens group.