CN107957622B - Large aperture and large image plane tele zoom lens - Google Patents
Large aperture and large image plane tele zoom lens Download PDFInfo
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- CN107957622B CN107957622B CN201810008623.1A CN201810008623A CN107957622B CN 107957622 B CN107957622 B CN 107957622B CN 201810008623 A CN201810008623 A CN 201810008623A CN 107957622 B CN107957622 B CN 107957622B
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- 230000003287 optical effect Effects 0.000 claims abstract description 59
- 238000003384 imaging method Methods 0.000 claims abstract description 6
- 230000014509 gene expression Effects 0.000 abstract description 6
- 239000011521 glass Substances 0.000 abstract description 3
- 238000012544 monitoring process Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
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- 238000010586 diagram Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/16—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group
- G02B15/163—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group
- G02B15/167—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group having an additional fixed front lens or group of lenses
- G02B15/173—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group having an additional fixed front lens or group of lenses arranged +-+
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Abstract
The invention provides a large-aperture large-image-surface tele zoom lens, which comprises a front fixed lens group with positive focal power, a zoom lens group with negative focal power, a rear fixed lens group with positive focal power and a compensation lens group with positive focal power, wherein the front fixed lens group with positive focal power, the zoom lens group with negative focal power, the rear fixed lens group with positive focal power and the compensation lens group with positive focal power are sequentially arranged along an optical axis from an object side to an image side, and the zoom lens group and the compensation lens group meet the following conditional expressions: 0.5< |Ff/Bf| <3, where Ff is the focal length of the compensation lens group and Bf is the focal length of the variable magnification lens group. The invention is a long focus zoom lens using 15 glass spherical lenses, the maximum aperture reaches F1.2, the maximum image plane 1/1.7', the resolution reaches eight megapixels, the focal length range is 10-40mm, the total optical length is less than 100mm, and the invention has the advantages of good imaging quality, large relative aperture, constant aperture and the like.
Description
Technical Field
The invention relates to the technical field of lenses, in particular to a large-aperture large-image-plane tele zoom lens.
Background
The long-focus lens has stronger shooting and remote control capability, so that the long-focus lens is widely applied to long-distance monitoring. Long-distance monitoring requires a large amount of light to ensure the brightness of the image, and therefore requires a large clear aperture for the lens. However, the aperture of the conventional tele zoom lens is generally about F2.0, and the light quantity is small. In low-light environments, infrared lamps are typically used for light filling, but in environments where ultra-long distance infrared lamps cannot reach, the overall image quality is poor. Therefore, it is necessary to develop a high-sensitivity imaging chip with a maximum image plane exceeding 1/1.7", and a maximum aperture reaching F1.2, and to obtain clear and bright images without the need of infrared light for light compensation in low-light environments.
Disclosure of Invention
The invention provides a large aperture and large image plane tele zoom lens, which overcomes the defects in the prior art.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
the utility model provides a big aperture large image plane's long focal length zoom, includes along the optical axis from object space to the preceding fixed lens group that has positive focal power, the variable magnification lens group that has negative focal power, the back fixed lens group that has positive focal power and the compensation lens group that has positive focal power that arranges in proper order, variable magnification lens group with the compensation lens group satisfies following conditional expression:
0.5<∣Ff/Bf∣<3，
wherein Ff is the focal length of the compensation lens group, and Bf is the focal length of the variable magnification lens group.
Further, the front fixed lens group and the rear fixed lens group respectively satisfy the following conditional expressions with the entire lens:
3<∣Qf/Wf∣<8；0.8<∣Qf/Tf∣<3.5，
1<∣Gf/Wf∣<6；0.4<∣Gf/Tf∣<3，
wherein Qf is the focal length of the front fixed lens group, gf is the focal length of the rear fixed lens group, and Wf and Tf represent the focal length of the whole lens at the shortest focal length and the focal length at the longest focal length, respectively.
Still further, the front fixed lens group includes a first lens having negative optical power, a second lens having positive optical power, and a third lens having positive optical power, which are sequentially arranged from the object side to the image side along the optical axis.
Preferably, the first lens and the second lens are glued to form a first glued lens, the first lens is a convex-concave lens, the second lens is a biconvex lens, and the third lens is a convex-concave lens.
Still further, the variable magnification lens group includes a fourth lens having negative power, a fifth lens having negative power, and a sixth lens having positive power, which are arranged in order from the object side to the image side along the optical axis.
Preferably, the fifth lens and the sixth lens are glued to form a second glued lens, the fourth lens is a biconcave lens, the fifth lens is a biconcave lens, the object side surface of the sixth lens is a convex surface, and the image side surface of the sixth lens is one of a convex surface, a plane surface and a concave surface.
Still further, the rear fixed lens group includes a seventh lens having positive optical power, an eighth lens having positive optical power, a ninth lens having positive optical power, and a tenth lens having negative optical power, which are sequentially arranged from the object side to the image side along the optical axis.
Preferably, the ninth lens and the tenth lens are glued to form a third glued lens, the seventh lens is a biconvex lens, the ninth lens is a biconvex lens, the tenth lens is a biconcave lens, the object side surface of the eighth lens is a convex surface, and the image side surface of the eighth lens is one of a convex surface, a plane surface and a concave surface.
Further, the compensation lens group includes an eleventh lens having negative optical power, a twelfth lens having positive optical power, a thirteenth lens having negative optical power, a fourteenth lens having positive optical power, and a fifteenth lens having positive optical power, which are arranged in order from the object side to the image side along the optical axis
Preferably, the eleventh lens and the twelfth lens are glued to form a fourth glued lens, the thirteenth lens and the fourteenth lens are glued to form a fifth glued lens, the eleventh lens is a biconcave lens, the twelfth lens is a biconvex lens, the thirteenth lens is a convex-concave lens, the fourteenth lens is a biconvex lens, and the fifteenth lens is a convex-concave lens.
The invention provides a large-aperture large-image-surface tele zoom lens, which comprises a front fixed lens group with positive focal power, a zoom lens group with negative focal power, a rear fixed lens group with positive focal power and a compensation lens group with positive focal power, wherein the front fixed lens group with positive focal power, the zoom lens group with negative focal power, the rear fixed lens group with positive focal power and the compensation lens group with positive focal power are sequentially arranged along an optical axis from an object side to an image side, and the zoom lens group and the compensation lens group meet the following conditional expressions: 0.5< |Ff/Bf| <3, where Ff is the focal length of the compensation lens group and Bf is the focal length of the variable magnification lens group. The invention is a long focus zoom lens using 15 glass spherical lenses, the maximum aperture reaches F1.2, the maximum image plane 1/1.7', the resolution reaches eight megapixels, the focal length range is 10-40mm, the total optical length is less than 100mm, and the invention has the advantages of good imaging quality, large relative aperture, constant aperture and the like.
Drawings
FIG. 1 is a schematic view of a large aperture and large image plane tele zoom lens according to an embodiment of the present invention at a shortest focal length;
fig. 2 is a schematic diagram of a structure of a large aperture and large image plane tele zoom lens according to an embodiment of the present invention at a longest focal length.
Detailed Description
Embodiments of the present invention will now be described in detail with reference to the drawings, which are intended to be used as references and illustrations only, and are not intended to limit the scope of the invention.
As shown in fig. 1 and 2, a tele zoom lens with a large aperture and a large image plane includes a front fixed lens group with positive power, a variable power lens group with negative power, a rear fixed lens group with positive power, and a compensation lens group with positive power, which are sequentially arranged from an object side to an image side along an optical axis, wherein the variable power lens group and the compensation lens group satisfy the following conditional expressions:
0.5<∣Ff/Bf∣<3，
wherein Ff is the focal length of the compensation lens group, and Bf is the focal length of the variable magnification lens group.
As a further improvement of the present embodiment, the front fixed lens group and the rear fixed lens group satisfy the following conditional expressions with the entire lens, respectively:
3<∣Qf/Wf∣<8；0.8<∣Qf/Tf∣<3.5，
1<∣Gf/Wf∣<6；0.4<∣Gf/Tf∣<3，
wherein Qf is the focal length of the front fixed lens group, gf is the focal length of the rear fixed lens group, wf and Tf respectively represent the focal length of the whole lens at the shortest focal length and the focal length at the longest focal length, namely, the zoom group is adjusted to the leftmost side and the rightmost side between the front fixed lens group and the rear fixed lens group of the lens.
As a further improvement of the present embodiment, the front fixed lens group includes a first lens 1 having negative optical power, a second lens 2 having positive optical power, and a third lens 3 having positive optical power, which are arranged in order from the object side to the image side along the optical axis.
In this embodiment, the first lens 1 and the second lens 2 are cemented to form a first cemented lens, the first lens 1 is a convex-concave lens, the second lens 2 is a biconvex lens, and the third lens 3 is a convex-concave lens. The first cemented lens is closely matched with the third lens 3 through a space ring.
As a further improvement of the present embodiment, the variable magnification lens group includes a fourth lens 4 having negative optical power, a fifth lens 5 having negative optical power, and a sixth lens 6 having positive optical power, which are arranged in order from the object side to the image side along the optical axis.
In this embodiment, the fifth lens 5 and the sixth lens 5 are cemented to form a second cemented lens, the fourth lens 4 is a biconcave lens, the fifth lens 5 is a biconcave lens, the object-side surface of the sixth lens 6 is a convex surface, and the image-side surface thereof is one of a convex surface, a plane surface and a concave surface. The second cemented lens is directly abutted against the fourth lens 4.
As a further improvement of the present embodiment, the rear fixed lens group includes a seventh lens 7 having positive optical power, an eighth lens 8 having positive optical power, a ninth lens 9 having positive optical power, and a tenth lens 10 having negative optical power, which are arranged in this order from the object side to the image side along the optical axis. The seventh lens 7 is provided with a diaphragm on the image side, and the diaphragm position can be tightly matched according to a specific design.
In this embodiment, the ninth lens 9 and the tenth lens 10 are cemented to form a third cemented lens, the seventh lens 7 is a biconvex lens, the ninth lens 9 is a biconvex lens, the tenth lens 10 is a biconcave lens, the object-side surface of the eighth lens 8 is a convex surface, and the image-side surface thereof is one of a convex surface, a plane surface and a concave surface. The seventh lens and the eighth lens are tightly matched through the space ring; the eighth and ninth lenses are tightly matched through the space ring.
As a further improvement of the present embodiment, the compensation lens group includes an eleventh lens 11 having negative optical power, a twelfth lens 12 having positive optical power, a thirteenth lens 13 having negative optical power, a fourteenth lens 14 having positive optical power, and a fifteenth lens 15 having positive optical power, which are arranged in this order from the object side to the image side along the optical axis.
In this embodiment, the eleventh lens 11 and the twelfth lens 12 are cemented to form a fourth cemented lens, the thirteenth lens 13 and the fourteenth lens 14 are cemented to form a fifth cemented lens, the eleventh lens 11 is a biconcave lens, the twelfth lens 12 is a biconvex lens, the thirteenth lens 13 is a convex-concave lens, the fourteenth lens 14 is a biconvex lens, the fifteenth lens 15 is a convex-concave lens, and the fifteenth lens 15 and the fourteenth lens 14 are tightly fitted through a spacer.
All lenses adopt ultra-low dispersion lenses, so that chromatic aberration of the lenses is greatly reduced, and imaging quality of the lenses is improved.
In the lens selection, the focal lengths and refractive indices of the first to fifteenth lenses 1 to 15 may be selected in the following ranges:
wherein f1 to f15 sequentially represent lens focal lengths of the first lens 1 to the fifteenth lens 15, respectively, and n1 to n15 sequentially represent refractive indices of the first lens 1 to the fifteenth lens 15, respectively.
In the present embodiment, the physical optical parameters of the first lens 1 to the fifteenth lens 15 are as shown in the following table:
| face number | Surface type | R(mm) | D(mm) | Nd |
| S1 | Spherical surface | 95 | 1.3 | 1.84 |
| S2&S3 | Spherical surface | 45.9 | 5.7 | 1.55 |
| S4 | Spherical surface | -220 | 0.2 | |
| S5 | Spherical surface | 30.3 | 4.1 | 1.6 |
| S6 | Spherical surface | 64.2 | Air interval is variable | |
| S7 | Spherical surface | -248 | 0.8 | 1.71 |
| S8 | Spherical surface | 13 | 3.75 | |
| S9 | Spherical surface | -28.85 | 3.9 | 1.48 |
| S10&S11 | Spherical surface | 18.2 | 3.1 | 1.85 |
| S12 | Spherical surface | 161 | Air interval is variable | |
| S13 | Spherical surface | 110.7 | 2.9 | 1.71 |
| S14 | Spherical surface | -59.3 | 0.1 | |
| Diaphragm | Plane surface | PL | Air interval is variable | |
| S16 | Spherical surface | 26.7 | 2.6 | 1.5 |
| S17 | Spherical surface | 231 | 0.1 | |
| S18 | Spherical surface | 18.64 | 7.2 | 1.5 |
| S19&S20 | Spherical surface | -19.85 | 1.5 | 1.65 |
| S21 | Spherical surface | 15.75 | Air interval is variable | |
| S22 | Spherical surface | -33.7 | 1 | 1.65 |
| S23&S24 | Spherical surface | 12.7 | 3.2 | 1.85 |
| S25 | Spherical surface | -34.2 | 0.1 | |
| S26 | Spherical surface | 165 | 1.5 | 1.85 |
| S27&S28 | Spherical surface | 10.9 | 3.7 | 1.5 |
| S29 | Spherical surface | -30.6 | 0.1 | |
| S30 | Spherical surface | 13.3 | 6.8 | 1.8 |
| S31 | Spherical surface | 22.1 | Air interval is variable | |
| S32 | Image plane | PL | ||
Wherein R is the surface center radius, the negative sign "-" represents the direction (concave corresponding to the object side surface, convex corresponding to the image side surface), and D is the distance from the corresponding optical surface to the next optical surface on the optical axis; nd corresponds to the refractive index of the lens at d-light (wavelength 587 nm).
S1 is the object side surface of the first cemented lens, S2& S3 is the cemented surface of the first cemented lens, and S4 is the image side surface of the first cemented lens; s5 and S6 are an object side surface and an image side surface of the third lens 3; s7 and S8 are the object side surface and the image side surface of the fourth lens 4; s9 is the object side surface of the second cemented lens, S10& S11 is the cemented surface of the second cemented lens, and S12 is the image side surface of the second cemented lens; s13 and S14 are an object side surface and an image side surface of the seventh lens 7; the diaphragm represents the optical plane in which the diaphragm is located; s16 and S17 are an object side surface and an image side surface of the eighth lens 8; s18 is the object side surface of the third cemented lens, S19& S20 is the cemented surface of the third cemented lens, and S21 is the image side surface of the third cemented lens; s22 is the object side surface of the fourth cemented lens, S23& S24 are the cemented surfaces of the fourth cemented lens, and S25 is the image side surface of the fourth cemented lens; s26 is the object side surface of the fifth cemented lens, S27& S28 is the cemented surface of the fifth cemented lens, and S29 is the image side surface of the fifth cemented lens; s30 and S31 are an object side surface and an image side surface of the fifteenth lens 15; s32 is the surface of the imaging chip. The designation "variable air gap" in the table indicates that the distance between the two optical surfaces changes during focusing.
In the actual focusing process, the purpose of zooming can be achieved by changing the relative positions of the zoom lens group and the compensation lens group, and the range of focal length zoom ratio is 3-10 times. Specifically, the whole variable power lens group moves back and forth along the optical axis in the front fixed lens group and the rear fixed lens group to perform focusing, and meanwhile, the compensation group can be made to move back and forth relative to the rear fixed lens group to perform compensation.
The invention forms a long focus zoom lens by adopting the 15 glass spherical lenses, the maximum aperture reaches F1.2, the maximum image surface reaches 1/1.7', the resolution reaches eight million pixels, the focal length range is 10-40mm, and the total optical length is less than 100mm.
The above disclosure is illustrative of the preferred embodiments of the present invention and should not be construed as limiting the scope of the invention, which is defined by the appended claims.
Claims (1)
1. The utility model provides a big iris big image plane's long focal length zoom, its characterized in that: consists of a front fixed lens group with positive focal power, a variable-magnification lens group with negative focal power, a rear fixed lens group with positive focal power and a compensation lens group with positive focal power which are sequentially arranged from an object side to an image side along an optical axis,
the front fixed lens group consists of a first lens with negative focal power, a second lens with positive focal power and a third lens with positive focal power, which are sequentially arranged from the object side to the image side along the optical axis, and the first lens and the second lens are glued to form a first glued lens;
the variable magnification lens group consists of a fourth lens with negative focal power, a fifth lens with negative focal power and a sixth lens with positive focal power, which are sequentially arranged from the object side to the image side along the optical axis, and the fifth lens and the sixth lens are glued to form a second glued lens;
the rear fixed lens group consists of a seventh lens with positive focal power, an eighth lens with positive focal power, a ninth lens with positive focal power and a tenth lens with negative focal power, which are sequentially arranged from the object side to the image side along the optical axis, and the ninth lens and the tenth lens are glued to form a third glued lens;
the compensation lens group consists of an eleventh lens with negative focal power, a twelfth lens with positive focal power, a thirteenth lens with negative focal power, a fourteenth lens with positive focal power and a fifteenth lens with positive focal power, which are sequentially arranged from the object side to the image side along the optical axis, wherein the eleventh lens and the twelfth lens are glued to form a fourth glued lens, and the thirteenth lens and the fourteenth lens are glued to form a fifth glued lens;
the physical optical parameters of the first lens to the fifteenth lens are as follows:
wherein R is the surface center radius, the negative sign "-" represents the direction, and D is the distance on the optical axis from the corresponding optical surface to the next optical surface; nd corresponds to the refractive index of the lens in d light, S1 is the object side surface of the first cemented lens, S2& S3 is the cemented surface of the first cemented lens, and S4 is the image side surface of the first cemented lens; s5 and S6 are an object side surface and an image side surface of the third lens 3; s7 and S8 are the object side surface and the image side surface of the fourth lens 4; s9 is the object side surface of the second cemented lens, S10& S11 is the cemented surface of the second cemented lens, and S12 is the image side surface of the second cemented lens; s13 and S14 are an object side surface and an image side surface of the seventh lens 7; the diaphragm represents the optical plane in which the diaphragm is located; s16 and S17 are an object side surface and an image side surface of the eighth lens 8; s18 is the object side surface of the third cemented lens, S19& S20 is the cemented surface of the third cemented lens, and S21 is the image side surface of the third cemented lens; s22 is the object side surface of the fourth cemented lens, S23& S24 are the cemented surfaces of the fourth cemented lens, and S25 is the image side surface of the fourth cemented lens; s26 is the object side surface of the fifth cemented lens, S27& S28 is the cemented surface of the fifth cemented lens, and S29 is the image side surface of the fifth cemented lens; s30 and S31 are an object side surface and an image side surface of the fifteenth lens 15; s32 is the surface of the imaging chip.
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| CN201810008623.1A CN107957622B (en) | 2018-01-04 | 2018-01-04 | Large aperture and large image plane tele zoom lens |
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| CN201810008623.1A CN107957622B (en) | 2018-01-04 | 2018-01-04 | Large aperture and large image plane tele zoom lens |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109445080B (en) * | 2018-12-29 | 2021-02-02 | 浙江大华技术股份有限公司 | Lens |
| CN109975965B (en) * | 2019-04-17 | 2023-12-15 | 厦门力鼎光电股份有限公司 | Zoom lens |
| CN111290107B (en) * | 2020-03-31 | 2024-07-09 | 深圳市东正光学技术股份有限公司 | High-magnification zoom film lens |
| CN116338919A (en) * | 2021-12-24 | 2023-06-27 | 东莞市宇瞳光学科技股份有限公司 | Zoom lens |
| CN114355597B (en) * | 2021-12-31 | 2023-04-07 | 福建福光股份有限公司 | Clear optical system that zooms of full-color 4K superelevation |
| CN115291374B (en) * | 2022-07-18 | 2023-05-09 | 福建福光股份有限公司 | Ultra-large target surface wide-object-distance compact type continuous zoom lens and imaging method thereof |
| CN116299983B (en) * | 2023-05-11 | 2023-08-18 | 杭州灵伴科技有限公司 | Near-to-eye display module detection lens |
| CN116774415B (en) * | 2023-08-18 | 2023-10-31 | 福建福特科光电股份有限公司 | Large aperture photographic lens with low respiratory effect |
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| CN101369048A (en) * | 2007-08-13 | 2009-02-18 | 株式会社尼康 | Zoom lens, and optical apparatus and method for forming an image of an object using the zoom lens |
| CN103323935A (en) * | 2013-06-26 | 2013-09-25 | 东莞市宇瞳光学科技有限公司 | Large-zoom camera lens capable of being used in the day and at night |
| CN207833095U (en) * | 2018-01-04 | 2018-09-07 | 东莞市宇瞳光学科技股份有限公司 | A kind of focal length zoom lens of the big image planes of large aperture |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101369048A (en) * | 2007-08-13 | 2009-02-18 | 株式会社尼康 | Zoom lens, and optical apparatus and method for forming an image of an object using the zoom lens |
| CN103323935A (en) * | 2013-06-26 | 2013-09-25 | 东莞市宇瞳光学科技有限公司 | Large-zoom camera lens capable of being used in the day and at night |
| CN207833095U (en) * | 2018-01-04 | 2018-09-07 | 东莞市宇瞳光学科技股份有限公司 | A kind of focal length zoom lens of the big image planes of large aperture |
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