CN209879126U - Large zoom ratio high-resolution large-view-field continuous zoom lens - Google Patents
Large zoom ratio high-resolution large-view-field continuous zoom lens Download PDFInfo
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- CN209879126U CN209879126U CN201921057838.9U CN201921057838U CN209879126U CN 209879126 U CN209879126 U CN 209879126U CN 201921057838 U CN201921057838 U CN 201921057838U CN 209879126 U CN209879126 U CN 209879126U
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Abstract
The utility model discloses a big zoom ratio high resolution ratio large-view continuous zoom lens, including the preceding fixed objective, preceding fixed optical assembly, high power diaphragm, zoom optical assembly, low power diaphragm, compensation optical assembly and the back fixed optical assembly that set gradually along the optical axis from the object side to the picture side, the focus of preceding fixed objective and the focus of preceding fixed optical assembly are positive, the focus of zoom optical assembly is negative and moves along the optical axis relative to preceding fixed optical assembly, the focus of compensation optical assembly is positive and moves along the optical axis relative to back fixed optical assembly, the focus of back fixed optical assembly is negative; the high-power diaphragm is fixedly arranged on the front fixed optical component, and the low-power diaphragm is arranged on the compensation optical component and moves synchronously with the compensation optical component. The utility model discloses move compensation optical assembly and compensation optical assembly along the optical axis according to specific orbit and realize 1:16 continuous zoom, have simple structure, zoom than big, the usable field of vision scope characteristics such as big.
Description
Technical Field
The utility model relates to an optical instrument equipment specifically is a big zoom ratio high resolution ratio big field of vision zoom lens in succession.
Background
The zoom lens refers to a lens with a finite conjugate distance, a continuously adjustable magnification within a certain range and a constant working distance.
With the continuous development of machine vision and industrial automation, zoom lenses are increasingly widely used. At present, the zoom range of the mainstream zoom lens is 0.7X-4.5X, the zoom ratio is 1:7, the size of a matched detector pixel is about 9 mu m, and the target surface of a compatible detector is 1/2 inches or less.
The detector technology of 4.5 μm or smaller pixel size, target surface above 2/3 inches is mature and widely used, and the new requirements for zoom lenses for higher resolution image demand are: the zoom range is larger, the optical resolution capability is better, and the detector with larger target surface size can be compatible.
SUMMERY OF THE UTILITY MODEL
For adapting to prior art development and application requirement, the utility model provides a big zoom ratio high resolution ratio big field of vision zoom lens in succession.
The technical scheme includes that the zoom lens comprises a front fixed objective, a front fixed optical assembly, a high-power diaphragm, a zoom optical assembly, a low-power diaphragm, a compensation optical assembly and a rear fixed optical assembly which are sequentially arranged from one side of an object plane to one side of an image plane along an optical axis, wherein the focal length of the front fixed objective and the focal length of the front fixed optical assembly are positive, the focal length of the zoom optical assembly is negative and moves relative to the front fixed optical assembly along the optical axis, the focal length of the compensation optical assembly is positive and moves relative to the rear fixed optical assembly along the optical axis, and the focal length of the rear fixed optical assembly is negative; the high-power diaphragm is fixedly arranged on the front fixed optical component, and the low-power diaphragm is arranged on the compensation optical component and moves synchronously with the compensation optical component.
In an optimization scheme, the front fixed objective lens comprises a biconvex lens I and a concave-convex lens I which are glued together, the curvature radius of the object side of the biconvex lens I is larger than that of the image side, and the refractive index and the Abbe number of the biconvex lens I meet n which is not less than 1.45dLess than or equal to 1.55 and less than or equal to 75νd85 or less, and the deviation of the relative partial dispersion from the normal glass line satisfies DeltaPgFNot less than 0.025; the focal length of the concave-convex lens I is negative, the concave surface of the concave-convex lens I faces the object side, the convex surface of the concave-convex lens I faces the image side, and the refractive index and the Abbe number of the concave-convex lens I meet n which is more than or equal to 1.55dV is not more than 1.65 and not more than 40d≤50。
In an optimized scheme, the front fixed optical assembly comprises a concave-convex lens II and a double-convex lens II which are glued together, the focal length of the concave-convex lens II is negative, the convex surface of the concave-convex lens II faces the object side, the concave surface of the concave-convex lens II faces the image side, and the refractive index and the Abbe number of the concave-convex lens II meet n which is more than or equal to 1.55dV is not more than 1.65 and not more than 40dLess than or equal to 50; the curvature radius of the object side of the biconvex lens II is smaller than that of the image side, and the refractive index and the Abbe number of the biconvex lens II meet n which is more than or equal to 1.45dLess than or equal to 1.55 and less than or equal to 75 vd85 or less, and the deviation of the relative partial dispersion from the normal glass line satisfies DeltaPgF≥0.025。
In an optimized scheme, the zoom optical assembly comprises a biconcave lens and a meniscus lens I which are glued together, the object side curvature radius of the biconcave lens is larger than the image side curvature radius, and the refractive index and the Abbe number of the biconcave lens meet n being more than or equal to 1.6dV is not less than 1.7 and not more than 40dLess than or equal to 50; the meniscus lens I has a convex surface facing the object side and a concave surface facing the image side, and the refractive index and Abbe number of the meniscus lens I satisfy n being not less than 1.75dV is not less than 1.85 and not more than 20d≤30。
In an optimized scheme, the compensation optical assembly comprises a concave-convex lens III and a double-convex lens III which are glued together, the focal length of the concave-convex lens III is negative, the convex surface of the concave-convex lens III faces the object side, the concave surface of the concave-convex lens III faces the image side, and the refractive index and the Abbe number of the concave-convex lens III meet n which is more than or equal to 1.7dV is not less than 1.8 and not less than 20dLess than or equal to 30; the focal length of the biconvex lens III is positive, the curvature radius of the image side of the biconvex lens III is larger than that of the object side, and the refractive index and the Abbe number of the biconvex lens III meet n which is more than or equal to 1.5dV is not more than 1.6 and not more than 50d≤60。
In an optimized scheme, the rear fixed optical assembly comprises a meniscus lens II and a plano-concave lens which are glued together, wherein the concave surface of the meniscus lens II faces to the object side, the convex surface of the meniscus lens II faces to the image side, and the refractive index and the Abbe number of the meniscus lens II meet n being more than or equal to 1.7dV is not less than 1.8 and not less than 20dLess than or equal to 30; the concave surface of the plano-concave lens faces the object and the plane faces the image side, and the refractive index and the Abbe number of the plano-concave lens meet n being more than or equal to 1.5dV is not more than 1.6 and not more than 50d≤60。
In an optimized scheme, the high-power diaphragm is an aperture diaphragm of an optical system when the optical magnification range is 5X (times) to 8X (times), and the optical interval between the high-power diaphragm and the image side surface of the biconvex lens II is 0; the low-power diaphragm is an aperture diaphragm of an optical system when the optical magnification range is 0.5X (times) -5X (times), and the optical interval between the low-power diaphragm and the object side surface of the concave-convex lens III is 0; the focal length of the variable magnification optical assembly and the focal length of the compensation optical assembly satisfyAccording to the proportional relation, the moving distance of the zooming optical assembly is 0-38.85 mm, and the matching moving distance of the compensation optical assembly is 0-33.95 mm.
In order to realize coaxial illumination by adding optical devices such as a beam splitter prism (or a beam splitter plate), light rays between the front fixed objective lens and the front fixed optical component are parallel light.
The utility model has the advantages that:
1. the utility model discloses big zoom ratio high resolution ratio big field of vision zoom lens in succession satisfies for positive compensation optical assembly and both focus for the variable power optical assembly of burden and focus through selecting the focusThe moving range of the zoom optical assembly relative to the front fixed optical assembly along the optical axis is 0-38.85 mm, the moving range of the corresponding compensation optical assembly relative to the rear fixed optical assembly along the optical axis according to a specific track is 0-33.95 mm, a stable and clear image can be formed on an image plane, and the high zoom ratio of 1:16 is realized.
2. The utility model discloses a positive, burden, positive, the focus combination of burden of each optical components for there is not the overlap in zoom optical components and compensation optical components displacement orbit, provides convenience for the mechanism arranges.
3. The utility model discloses a positive, negative, positive, the focus combination of burden of each optical components for the curvature of field of system is rectified more profitably, thereby has realized the usable field of vision of the great image space of compatible 1 inch target surface detector.
4. The utility model discloses in, the light that passes through between preceding fixed objective and the preceding fixed optical assembly is the parallel light, and optical devices such as beam splitter prism (or beam splitter plain film) can be added between the two and the coaxial illumination is realized and the system imaging quality and working distance are not influenced.
5. The utility model discloses in, special relative partial dispersion optical material is all adopted to lenticular I and lenticular II, is showing and has reduced the second grade spectrum for high power NA can reach 0.14, thereby realizes the high resolution.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
Fig. 2 is a schematic diagram of the zoom optical assembly and the compensation optical assembly of the embodiment of fig. 1 for adjusting positions on an optical axis.
And (3) identifying the figure number: 1. a front fixed objective lens; 1-1, a biconvex lens I; 1-2, a concave-convex lens I; 2. a front fixed optical component; 2-1, concave-convex lens II; 2-2, a biconvex lens II; 3. a variable magnification optical assembly; 3-1, a biconcave lens; 3-2, a meniscus lens I; 4. a compensating optical component; 4-1, a meniscus lens III; 4-2, a lenticular lens iii; 5. a rear fixed optical component; 5-1, a meniscus lens II; 5-2, plano-concave lens; 6. a high power diaphragm; 7. and (5) a low-power diaphragm.
Detailed Description
The technical solution of the present invention will be further explained with reference to the embodiments shown in the drawings.
The utility model discloses big zoom ratio is big continuous zoom lens in field of vision of high resolution ratio, include from object plane one side to image plane one side along the preceding fixed objective 1 that the optical axis set gradually right, preceding fixed optical assembly 2, high power diaphragm 6 (the diaphragm when optical magnification 5X ~ 8X), zoom optical assembly 3, low power diaphragm 7 (the diaphragm when optical magnification 0.5X ~ 5X (do not contain)), compensation optical assembly 4 and after-fixing optical assembly 5, light between preceding fixed objective 1 and the preceding fixed optical assembly 2 is the parallel light, as shown in figure 1, figure 2.
The focal length of the front fixed objective lens 1 is positive, the front fixed objective lens comprises a biconvex lens I1-1 (on the left) and a concave-convex lens I1-2 (on the right) which are glued together, the radius of curvature of the object side (left) of the biconvex lens I1-1 is larger than that of the image side (right), the refractive index and the Abbe number of the biconvex lens I1 meet n being more than or equal to 1.45dLess than or equal to 1.55 and less than or equal to 75 vd85 or less, and the deviation of the relative partial dispersion from the normal glass line satisfies DeltaPgFNot less than 0.025; the focal length of the concave-convex lens I1-2 is negative, the concave surface faces to the object side (left) and the convex surface faces to the image side (right), and the refractive index and the Abbe number of the concave-convex lens satisfy n being more than or equal to 1.55dV is not more than 1.65 and not more than 40dIs less than or equal to 50, as shown in figure 1 and figure 2.
The focal length of the front fixed optical component 2 is positive, the front fixed optical component comprises a concave-convex lens II 2-1 (on the left) and a double-convex lens II 2-2 (on the right) which are glued together, the focal length of the concave-convex lens II 2-1 is negative, the convex surface of the concave-convex lens II 2-1 faces to the object side (on the left) and the concave surface of the concave-convex lens II 2-1 faces to the image side (on the right), the refractive index and the Abbe number of the concave-convex lensdV is not more than 1.65 and not more than 40dLess than or equal to 50; the object side (left) curvature radius of the biconvex lens II 2-2 is smaller than the image side (right) curvature radius, and the refractive index and the Abbe number of the biconvex lens II satisfy n being more than or equal to 1.45dLess than or equal to 1.55 and less than or equal to 75 vd85 or less, and the deviation of the relative partial dispersion from the normal glass line satisfies DeltaPgFNot less than 0.025 as shown in FIG. 1 and FIG. 2.
The focal length of the zoom optical assembly 3 is negative and can reciprocate (0-38.85 mm) at one side of the front fixed optical assembly 2 along the optical axis, the zoom optical assembly comprises a biconcave lens 3-1 and a meniscus lens I3-2 which are glued together, the object-side (left) curvature radius of the biconcave lens 3-1 is larger than the image-side (right) curvature radius, and the refractive index and the Abbe number of the biconcave lens meet n being more than or equal to 1.6dV is not less than 1.7 and not more than 40dLess than or equal to 50; the meniscus lens I3-2 has a convex surface facing the object side (left) and a concave surface facing the image side (right), and has a refractive index and Abbe number satisfying 1.75 ≤ ndV is not less than 1.85 and not more than 20dLess than or equal to 30, as shown in figure 1 and figure 2.
The compensation optical assembly 4 has a positive focal length and can reciprocate (0-33.95 mm) along the optical axis on one side of the rear fixed optical assembly 5, and includes a meniscus lens iii 4-1 (on the left) and a biconvex lensA lens III 4-2 (on the right), the focal length of the concave-convex lens III 4-1 is negative, the convex surface of the concave-convex lens III 4-1 faces to the object side (left) and the concave surface faces to the image side (right), and the refractive index and the Abbe number of the concave-convex lens III 4-1 meet n which is more than or equal to 1.7dV is not less than 1.8 and not less than 20dLess than or equal to 30; the focal length of the biconvex lens III 4-2 is positive, the image side (right) curvature radius of the biconvex lens III 4-2 is larger than the object side (left) curvature radius, and the refractive index and the Abbe number of the biconvex lens satisfy n being more than or equal to 1.5dV is not more than 1.6 and not more than 50d60 or less as shown in figure 1 and figure 2.
The rear fixed optical component 5 has a negative focal length and comprises a meniscus lens II 5-1 (on the left) and a plano-concave lens 5-2 (on the right) which are glued together, the concave surface of the meniscus lens II 5-1 faces to the object side (left) and the convex surface faces to the image side (right), the refractive index and the Abbe number of the meniscus lens II 5-1 satisfy n being more than or equal to 1.7dV is not less than 1.8 and not less than 20dLess than or equal to 30; the concave surface of the plano-concave lens 5-2 faces to the object side (left) and the plane faces to the image side (right), and the refractive index and Abbe number of the plano-concave lens satisfy 1.5 ≤ ndV is not more than 1.6 and not more than 50d60 or less as shown in figure 1 and figure 2.
The high-power diaphragm 6 is arranged on the front fixed optical assembly 2, and the optical interval between the high-power diaphragm 6 and the image side (right) surface of the biconvex lens ii 2-2 is 0, as shown in fig. 1 and 2.
The low power diaphragm 7 is disposed on the compensation optical assembly 4, and an optical interval between the low power diaphragm 7 and the object side (left) surface of the meniscus iii-4-1 is 0, as shown in fig. 2.
The focal length of the zooming optical component 3 and the focal length of the compensating optical component 4 meetThe relational expression (c) of (c).
The utility model relates to an actual design does:
the above embodiments only represent a more specific and detailed implementation of the present invention, but should not be interpreted as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention.
Claims (9)
1. Big zoom ratio is big continuous zoom lens in field of vision of high resolution ratio, its characterized in that: the zoom lens comprises a front fixed objective lens (1), a front fixed optical assembly (2), a high-power diaphragm (6), a zoom optical assembly (3), a low-power diaphragm (7), a compensation optical assembly (4) and a rear fixed optical assembly (5) which are sequentially arranged from one side of an object plane to one side of an image plane along an optical axis, wherein the focal length of the front fixed objective lens (1) and the focal length of the front fixed optical assembly (2) are positive, the focal length of the zoom optical assembly (3) is negative and moves relative to the front fixed optical assembly (2) along the optical axis, the focal length of the compensation optical assembly (4) is positive and moves relative to the rear fixed optical assembly (5) along the optical axis, and the focal length of the rear fixed optical assembly (5) is negative; the high-power diaphragm (6) is fixedly arranged on the front fixed optical component (2), and the low-power diaphragm (7) is arranged on the compensation optical component (4) and moves synchronously with the compensation optical component (4).
2. The large zoom ratio high-resolution large-field-of-view zoom lens of claim 1, wherein: the front fixed objective (1) comprises a double-convex lens I (1-1) and a concave-convex lens I (1-2) which are glued, the curvature radius of the object side of the double-convex lens I (1-1) is larger than that of the image side, and the refractive index and the Abbe number of the double-convex lens I (1-1) meet n being more than or equal to 1.45dLess than or equal to 1.55 and less than or equal to 75 vd85 or less, and the deviation of the relative partial dispersion from the normal glass line satisfies DeltaPgFNot less than 0.025; the focal length of the concave-convex lens I (1-2) is negative, the concave surface faces to the object side, the convex surface faces to the image side, and the refractive index and the Abbe number of the concave-convex lens I satisfy n being more than or equal to 1.55dV is not more than 1.65 and not more than 40d≤50。
3. The large zoom ratio high-resolution large-field-of-view zoom lens of claim 1, wherein: the anterior fixationThe fixed optical component (2) comprises a concave-convex lens II (2-1) and a double-convex lens II (2-2) which are cemented, the focal length of the concave-convex lens II (2-1) is negative, the convex surface of the concave-convex lens II (2-1) faces the object side, the concave surface of the concave-convex lens II (2-1) faces the image side, and the refractive index and the Abbe number of the concave-convex lens II (2-1) meet n being more than ordV is not more than 1.65 and not more than 40dLess than or equal to 50; the object side curvature radius of the biconvex lens II (2-2) is smaller than the image side curvature radius, and the refractive index and the Abbe number of the biconvex lens II satisfy n being more than or equal to 1.45dLess than or equal to 1.55 and less than or equal to 75 vd85 or less, and the deviation of the relative partial dispersion from the normal glass line satisfies DeltaPgF≥0.025。
4. The large zoom ratio high-resolution large-field-of-view zoom lens of claim 1, wherein: the zoom optical component (3) comprises a cemented biconcave lens (3-1) and a meniscus lens I (3-2), the object side curvature radius of the biconcave lens (3-1) is larger than the image side curvature radius, and the refractive index and the Abbe number of the biconcave lens satisfy n being more than or equal to 1.6dV is not less than 1.7 and not more than 40dLess than or equal to 50; the meniscus lens I (3-2) has a convex surface facing the object side and a concave surface facing the image side, and has a refractive index and an Abbe number satisfying n of 1.75 ≤dV is not less than 1.85 and not more than 20d≤30。
5. The large zoom ratio high-resolution large-field-of-view zoom lens of claim 1, wherein: the compensation optical component (4) comprises a cemented meniscus lens III (4-1) and a biconvex lens III (4-2), the focal length of the meniscus lens III (4-1) is negative, the convex surface of the meniscus lens III (4-1) faces the object side, the concave surface faces the image side, the refractive index and the Abbe number of the meniscus lens III (4-1) satisfy n being more than or equal to 1.7dV is not less than 1.8 and not less than 20dLess than or equal to 30; the focal length of the biconvex lens III (4-2) is positive, the curvature radius of the image side of the biconvex lens is larger than that of the object side, and the refractive index and the Abbe number of the biconvex lens satisfy n being more than or equal to 1.5dV is not more than 1.6 and not more than 50d≤60。
6. The large zoom ratio high-resolution large-field-of-view zoom lens of claim 1, wherein: the rear fixed optical component (5) comprises a meniscus lens II (5-1) and a plano-concave lens (5-2) which are glued, and the concave surface of the meniscus lens II (5-1) faces towardsThe refractive index and Abbe number of the object side and the convex side facing the image side satisfy 1.7 ≤ ndV is not less than 1.8 and not less than 20dLess than or equal to 30; the concave surface of the plano-concave lens (5-2) faces towards the object and the plane faces towards the image side, and the refractive index and the Abbe number of the plano-concave lens satisfy n being more than or equal to 1.5dV is not more than 1.6 and not more than 50d≤60。
7. The large zoom ratio high-resolution large-field-of-view zoom lens of claim 1, wherein: the high-power diaphragm (6) is an aperture diaphragm of an optical system when the optical magnification range is 5X-8X, and the optical interval between the high-power diaphragm (6) and the image side surface of the biconvex lens II (2-2) is 0; the low-power diaphragm (7) is an aperture diaphragm of an optical system when the optical magnification range is 0.5X-5X, and the optical interval between the low-power diaphragm (7) and the object side surface of the concave-convex lens III (4-1) is 0; the focal length of the zooming optical component (3) and the focal length of the compensating optical component (4) meet the requirementAccording to the proportional relation, the moving distance of the zooming optical assembly (3) is 0-38.85 mm, and the matching moving distance of the compensation optical assembly (4) is 0-33.95 mm.
8. The large zoom ratio high-resolution large-field-of-view zoom lens of claim 7, wherein: the optical magnification range is 0.5X-8.0X, and the zoom ratio is 1: 16.
9. The high-resolution high-field-of-view continuous zoom lens according to any one of claims 1 to 8, wherein: and the light rays between the front fixed objective lens (1) and the front fixed optical component (2) are parallel light.
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| CN201921057838.9U CN209879126U (en) | 2019-07-08 | 2019-07-08 | Large zoom ratio high-resolution large-view-field continuous zoom lens |
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| CN201921057838.9U CN209879126U (en) | 2019-07-08 | 2019-07-08 | Large zoom ratio high-resolution large-view-field continuous zoom lens |
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