CN104297909B - A kind of big logical light high-res zoom lens - Google Patents
A kind of big logical light high-res zoom lens Download PDFInfo
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- CN104297909B CN104297909B CN201410628191.6A CN201410628191A CN104297909B CN 104297909 B CN104297909 B CN 104297909B CN 201410628191 A CN201410628191 A CN 201410628191A CN 104297909 B CN104297909 B CN 104297909B
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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
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Abstract
A kind of big logical light high-res zoom lens of disclosure, from thing side, the front lens group with negative focal length is included along optical axis direction, diaphragm and the rear mirror group with positive focal length, front lens group includes the first to the 3rd lens successively along optical axis direction from thing side, rear mirror group includes the 4th to the 9th lens successively along optical axis direction from thing side, with thing side for front, first lens are front flat rear concavees lens, second lens are front recessed rear concavees lens, 3rd lens are plano lens after lordosis, second lens and the 3rd lens are mutually glued, 4th lens are plano lens and for non-spherical lens after lordosis, 5th lens are concavees lens after lordosis, 6th lens are convex lens after lordosis, 5th lens and the 6th lens are mutually glued, 7th lens are front recessed rear concavees lens, 8th lens are convex lens after lordosis, 7th lens and the 8th lens are mutually glued, 9th lens are concavees lens after lordosis, the present invention can obtain the image quality of high-resolution under big logical light quantity, and assembling and setting is relatively simple.
Description
Technical field
The present invention relates to pick-up lens, especially a kind of big logical light high-res zoom lens.
Background technology
Now, monitoring system is widely used to various place and carries out round-the-clock monitoring, and the key component of monitoring system is video camera, and camera lens is the vitals of video camera, and the quality of camera lens directly affects the image quality of video camera. Existing monitoring camera f-number FNo. is generally 1.6～1.8, when by day, mostly disclosure satisfy that the photographing request of video camera, but at shooting at night, image quality is just undesirable. Owing to ambient light is low when subject matter is night or details in a play not acted out on stage, but told through dialogues distinguishes, the logical deficiency in light quantity of camera lens, if common lens adopts large aperture, after increasing logical light quantity, can there is again aberration obvious, the problem that imaging definition is not enough.
One patent No. of 2012 01 year 25 days bulletins is that ZL200910040992.X, name are called: the Chinese invention patent of " a kind of large aperture monitoring camera ", and its technical scheme is to include having the first battery of lens of negative focal length, auto iris from thing side along optical axis and have the second battery of lens of positive focal length; Second battery of lens includes at least three pieces of lens, and wherein first lens and last a piece of lens are plastic aspheric lens, and first lens has positive focal length, and last a piece of lens has negative focal length; Meeting the following conditions between the focal length of first lens and last a piece of lens: 2.0 < | fa/fb | < 4.0, wherein fa is the focal length of first lens, and fb is the focal length of last a piece of lens. This large aperture monitoring camera have employed the aspherical lens of two panels complementary type, it is ensured that when big logical light quantity, imaging picture element is not subjected to impact, and aberration obtains good calibration result. But adopt the aspherical lens of two panels complementary type, assembling and the difficulty of debugging can be improved, simultaneously because the manufacturing cost of aspherical lens is higher, adopt multiple aspherical mirror sector-meeting to improve the manufacturing cost of camera lens accordingly in a camera lens.
This large aperture monitoring camera it also illustrates and substitutes glass lens with plastic aspherical element eyeglass, to alleviate the weight of camera lens and to reduce manufacturing cost, but plastic aspherical element eyeglass temperature characterisitic is poor, uses in the presence of a harsh environment and easily produce deformation, also can affect the imaging effect of camera lens.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of big logical light high-res zoom lens, and it leads to greatly the image quality that can obtain high-resolution under light quantity premise guaranteeing, and assembling and setting is relatively simple.
For reaching above-mentioned purpose, the technical scheme is that a kind of big logical light high-res zoom lens, from thing side, the front lens group with negative focal length is included along optical axis direction, diaphragm and the rear mirror group with positive focal length, front lens group and rear mirror group can move back and forth relative to diaphragm, described front lens group at least includes the first lens successively along optical axis direction from thing side, second lens and the 3rd lens, with thing side for front, first lens are front flat rear concavees lens, second lens are front recessed rear concavees lens, 3rd lens are plano lens after lordosis, second lens and the 3rd lens are mutually glued,
Described rear mirror group at least includes the 4th lens, the 5th lens, the 6th lens, the 7th lens, the 8th lens and the 9th lens successively along optical axis direction from thing side, with thing side for front, 4th lens are plano lens and for non-spherical lens after lordosis, 5th lens are concavees lens after lordosis, 6th lens are convex lens after lordosis, 5th lens and the 6th lens are mutually glued, 7th lens are front recessed rear concavees lens, 8th lens are convex lens after lordosis, 7th lens and the 8th lens are mutually glued, and the 9th lens are concavees lens after lordosis.
Preferred described front lens group focal distance f-L1With rear lens group focal distance fL2Ratio meet the following conditions: 0.75 < | f-L1/fL2| < 0.85; The camera lens focal distance f when taking the photograph distant positionstWith the camera lens focal distance f at wide-angle positionwRatio meets the following conditions: 2.55 < ft/fw< 3.45. So that camera lens has bigger zoom ratio and higher lightness.
4th focal length of lens f in preferred described rear mirror groupaWith the 5th lens and the 6th lens gluing back focal length fbRatio meet the following conditions: 1.0 < fa/fb<2.0。
4th focal length of lens f in preferred described rear mirror groupaWith the 7th lens and the 8th lens gluing back focal length fcRatio meet the following conditions: 0.8 < | fa/fc|<1.5。
Preferably the coefficient of expansion α of described 4th lens satisfies condition: α < 10.
Preferably described 4th lens are glass aspheric lenses, and its refractive index N satisfies condition: 1.65 < N < 1.8.
Preferably the spacing of described first lens and the second lens is 5～6mm.
Preferably the spacing of described 8th lens and the 9th lens is 0.1～1.1mm.
4th focal length of lens f in preferred described rear mirror groupaWith the 9th focal length of lens fdRatio meet the following conditions: 2 < fd/fa<3。
It is preferred that, described 4th focal length of lens fa> 10mm, the 9th focal length of lens fd> 25mm.
The present invention the first lens by front lens group, second lens and the 3rd lens combination light of many object plane reflections as far as possible guides and passes through diaphragm, realize big logical light, after light arrival after mirror group, owing to the 4th lens are plano lens and for non-spherical lens after lordosis, effectively senior aberration is corrected, it is positive focal length after 5th lens and the 6th lens gluing mutually simultaneously, 7th lens and the 8th lens gluing mutually is negative focal length, 5th lens and the 6th lens and the 7th lens and the 8th lens are to being focused by the light after the 4th lens, correct various aberrations further, and the 9th lens are positive focal length lens, good curvature of field correction can be carried out, therefore the invention can ensure that when big logical light quantity, still have good resolution. the present invention is only with a piece of non-spherical lens simultaneously, facilitates assembling and the debugging of whole camera lens, also can reduce the manufacturing cost of camera lens.
Accompanying drawing explanation
Fig. 1 is front lens group of the present invention and the structural representation of rear mirror group.
Detailed description of the invention
Below in conjunction with accompanying drawing and specific embodiment, the present invention is described in further detail.
Shown in Fig. 1, a kind of big logical light high-res zoom lens, include from thing side along optical axis direction there is the front lens group 10 of negative focal length, diaphragm 20 and there is the rear mirror group 30 of positive focal length, front lens group 10 and rear mirror group 20 and can move back and forth relative to diaphragm 20, to reach the effect of zoom.
Described front lens group 10 includes the first lens the 1, second lens 2 and the 3rd lens 3 successively along optical axis direction from thing side, with thing side for front, first lens 1 are front flat rear concavees lens, second lens 2 are front recessed rear concavees lens, 3rd lens 3 are plano lens after lordosis, and the second lens 2 and the 3rd lens 3 are mutually glued;
Described rear mirror group 30 includes the 4th lens the 4, the 5th lens the 5, the 6th lens the 6, the 7th lens the 7, the 8th lens 8 and the 9th lens 9 successively along optical axis direction from thing side, with thing side for front, 4th lens 4 are plano lens and for non-spherical lens after lordosis, 5th lens 5 are concavees lens after lordosis, 6th lens 6 are convex lens after lordosis, 5th lens 5 and the 6th lens 6 are mutually glued, 7th lens 7 are front recessed rear concavees lens, 8th lens 8 are convex lens after lordosis, 7th lens 7 and the 8th lens 8 are mutually glued, and the 9th lens 9 are concavees lens after lordosis.
Described front lens group 10 focal distance f-L1With rear lens group 30 focal distance fL2Ratio meet the following conditions: 0.75 < | f-L1/fL2| < 0.85;
The camera lens focal distance f when taking the photograph distant positionstWith the camera lens focal distance f at wide-angle positionwRatio meets the following conditions: 2.55 < ft/fw<3.45。
4th lens 4 focal distance f in described rear mirror group 30aBack focal length f glued with the 5th lens 5 and the 6th lens 6bRatio meet the following conditions: 1.0 < fa/fb<2.0。
4th lens 4 focal distance f in described rear mirror group 30aBack focal length f glued with the 7th lens 7 and the 8th lens 8cRatio meet the following conditions: 0.8 < | fa/fc|<1.5
Glass aspheric lenses selected by described 4th lens 4, and its coefficient of expansion α satisfies condition: α < 10, and its refractive index N satisfies condition: 1.65 < N < 1.8.
The spacing of described first lens 1 and the second lens 2 is 5～6mm; The spacing of described 8th lens 8 and the 9th lens 9 is 0.1～1.1mm.
4th lens 4 focal distance f in described rear mirror group 30aWith the 9th lens 9 focal distance fdRatio meet the following conditions: 2 < fd/fa< 3. Preferably described 4th lens 4 focal distance fa> 10mm, the 9th lens 9 focal distance fd> 25mm.
In described diaphragm 20 can installation infrared filtering apparatus, to improve the imaging definition at this camera lens night further.
Below being only one preferred embodiment of the present invention, those skilled in the art does equivalent change by claim and both falls within the protection domain of this case.
Claims (10)
1. a big logical light high-res zoom lens, includes from thing side along optical axis direction having the front lens group of negative focal length, diaphragm and have the rear mirror group of positive focal length, front lens group and rear mirror group and can move back and forth relative to diaphragm, it is characterised in that:
Described front lens group at least includes the first lens, the second lens and the 3rd lens successively along optical axis direction from thing side, with thing side for front, the first lens are front flat rear concavees lens, and the second lens are front recessed rear concavees lens, 3rd lens are plano lens after lordosis, and the second lens and the 3rd lens are mutually glued;
Described rear mirror group at least includes the 4th lens, the 5th lens, the 6th lens, the 7th lens, the 8th lens and the 9th lens successively along optical axis direction from thing side, with thing side for front, 4th lens are plano lens and for non-spherical lens after lordosis, 5th lens are concavees lens after lordosis, 6th lens are convex lens after lordosis, 5th lens and the 6th lens are mutually glued, 7th lens are front recessed rear concavees lens, 8th lens are convex lens after lordosis, 7th lens and the 8th lens are mutually glued, and the 9th lens are concavees lens after lordosis.
2. the logical greatly light high-res zoom lens of one according to claim 1, it is characterised in that: described front lens group focal distance f-L1With rear lens group focal distance fL2Ratio meet the following conditions: 0.75 < | f-L1/fL2| < 0.85;
The camera lens focal distance f when taking the photograph distant positionstWith the camera lens focal distance f at wide-angle positionwRatio meets the following conditions: 2.55 < ft/fw<3.45。
3. the logical greatly light high-res zoom lens of one according to claim 1, it is characterised in that: the 4th focal length of lens f in described rear mirror groupaWith the 5th lens and the 6th lens gluing back focal length fbRatio meet the following conditions: 1.0 < fa/fb<2.0。
4. the logical greatly light high-res zoom lens of one according to claim 1, it is characterised in that: the 4th focal length of lens f in described rear mirror groupaWith the 7th lens and the 8th lens gluing back focal length fcRatio meet the following conditions: 0.8 < | fa/fc|<1.5。
5. the logical greatly light high-res zoom lens of one according to claim 1, it is characterised in that: the coefficient of expansion α of described 4th lens satisfies condition: α < 10.
6. the logical greatly light high-res zoom lens of one according to claim 1, it is characterised in that: described 4th lens are glass aspheric lenses, and its refractive index N satisfies condition: 1.65 < N < 1.8.
7. the logical greatly light high-res zoom lens of one according to claim 1, it is characterised in that: the spacing of described first lens and the second lens is 5～6mm.
8. the logical greatly light high-res zoom lens of one according to claim 1, it is characterised in that: the spacing of described 8th lens and the 9th lens is 0.1～1.1mm.
9. a kind of big logical light high-res zoom lens according to any one of claim 1 to 8, it is characterised in that: the 4th focal length of lens f in described rear mirror groupaWith the 9th focal length of lens fdRatio meet the following conditions: 2 < fd/fa<3。
10. the logical greatly light high-res zoom lens of one according to claim 9, it is characterised in that: described 4th focal length of lens fa> 10mm, the 9th focal length of lens fd> 25mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201410628191.6A CN104297909B (en) | 2014-11-11 | 2014-11-11 | A kind of big logical light high-res zoom lens |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410628191.6A CN104297909B (en) | 2014-11-11 | 2014-11-11 | A kind of big logical light high-res zoom lens |
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| CN104297909A CN104297909A (en) | 2015-01-21 |
| CN104297909B true CN104297909B (en) | 2016-06-15 |
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| CN201410628191.6A Active CN104297909B (en) | 2014-11-11 | 2014-11-11 | A kind of big logical light high-res zoom lens |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110174756B (en) * | 2019-06-27 | 2024-05-24 | 东莞市宇瞳光学科技股份有限公司 | Zoom lens |
| CN115047605B (en) * | 2022-07-05 | 2024-01-19 | 湖北准视光电科技有限公司 | Imaging lens |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002207166A (en) * | 2001-01-11 | 2002-07-26 | Pentax Precision Co Ltd | Variable focal distance lens |
| CN103336353A (en) * | 2013-06-26 | 2013-10-02 | 东莞市宇瞳光学科技有限公司 | Two-component optical compensation monitoring lens |
| CN204129319U (en) * | 2014-11-11 | 2015-01-28 | 厦门力鼎光电技术有限公司 | A kind of large logical light high-res zoom lens |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5417218B2 (en) * | 2010-02-25 | 2014-02-12 | 株式会社タムロン | Zoom lens |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002207166A (en) * | 2001-01-11 | 2002-07-26 | Pentax Precision Co Ltd | Variable focal distance lens |
| CN103336353A (en) * | 2013-06-26 | 2013-10-02 | 东莞市宇瞳光学科技有限公司 | Two-component optical compensation monitoring lens |
| CN204129319U (en) * | 2014-11-11 | 2015-01-28 | 厦门力鼎光电技术有限公司 | A kind of large logical light high-res zoom lens |
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Address after: 361000 26 Xinmei Road, Xinyang Industrial Zone, Haicang, Xiamen, Fujian Patentee after: Xiamen Li Ding Au Optronics Co Address before: 361000 26 Xinmei Road, Xinyang Industrial Zone, Haicang, Xiamen, Fujian Patentee before: Xiamen Leading Optics Co., Ltd. |