CN111025610B - An optical system with small zoom, large image surface and large aperture - Google Patents
An optical system with small zoom, large image surface and large aperture Download PDFInfo
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- CN111025610B CN111025610B CN201911140675.5A CN201911140675A CN111025610B CN 111025610 B CN111025610 B CN 111025610B CN 201911140675 A CN201911140675 A CN 201911140675A CN 111025610 B CN111025610 B CN 111025610B
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- lens
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- photosensitive chip
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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
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/008—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras designed for infrared light
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Nonlinear Science (AREA)
- Lenses (AREA)
Abstract
The invention provides an optical system capable of solving the technical problems of small image surface, low definition, small aperture, incomplete infrared confocal and the like, comprising a first lens group, a diaphragm, a second lens group, a third lens group, an optical filter and a photosensitive chip, wherein the first lens group, the diaphragm, the second lens group, the third lens group, the optical filter and the photosensitive chip are sequentially arranged from an object surface to a phase surface, the focal length of the third lens group is negative, the third lens group is fixed relative to the photosensitive chip, the focal length of the first lens group is negative, the first lens group can move back and forth relative to the photosensitive chip along the object image direction, the focal length of the second lens group is positive, the second lens group can move back and forth relative to the photosensitive chip along the object image direction, the second lens group comprises a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens and a ninth lens which are sequentially arranged along the object image direction, and the fourth lens and the ninth lens adopt glass aspheric lenses.
Description
[ Field of technology ]
The invention relates to the field of monitoring systems, in particular to an optical system with small zoom, large image plane and large aperture.
[ Background Art ]
The current zooming optical system for monitoring has the defects of low system definition, small aperture, incapability of ensuring complete confocal of infrared rays of each focal length in the zooming process, and the like. At present, the market does not have a lens which fully combines the characteristics, only has a few lenses, and improves a certain aspect under the condition of sacrificing other aspects, for example, in order to realize ultra-high definition and infrared confocal, the aperture design is smaller, and the definition requirement of the monitoring lens under the condition of low illumination cannot be met.
[ Invention ]
The invention aims to provide an optical system with small zoom, large image surface and large aperture, which can solve the technical problems of small image surface, low definition, small aperture, incomplete infrared confocal and the like.
The purpose of the invention is realized in the following way:
The optical system comprises a first lens group, a diaphragm, a second lens group, a third lens group, an optical filter and a photosensitive chip, wherein the first lens group, the diaphragm, the second lens group, the third lens group, the optical filter and the photosensitive chip are sequentially arranged from an object plane to a phase plane, the focal length of the third lens group is a negative value, the third lens group is fixed relative to the photosensitive chip, the focal length of the first lens group is a negative value, the first lens group can move back and forth along an object image direction relative to the photosensitive chip, the focal length of the second lens group is a positive value, the second lens group can move back and forth along the object image direction relative to the photosensitive chip, the second lens group comprises a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens and a ninth lens which are sequentially arranged along the object image direction, and the fourth lens and the ninth lens adopt glass aspheric lenses.
In the optical system with small zoom, large image plane and large aperture, the focal power of the fourth lens, the fifth lens, the seventh lens and the ninth lens is positive, the focal power of the eighth lens is negative, and the focal power of the sixth lens is positive or negative.
The first lens group comprises a first lens, a second lens and a third lens which are sequentially arranged along the object image direction, the third lens group comprises a tenth lens, an eleventh lens and a twelfth lens which are sequentially arranged along the object image direction, and the first lens, the second lens, the third lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens, the tenth lens, the eleventh lens and the twelfth lens are all glass spherical lenses.
An optical system with small zoom, large image plane, and large aperture as described above, wherein the aspherical surface profiles of the fourth lens and the ninth lens satisfy the following equation:
Wherein k, a 1、a2、a3、a4、a5、a6、a7 and a 8 are aspheric coefficients, Z and y are the coordinates of the lens surface on the horizontal axis and the coordinates of the lens surface on the vertical axis in a Cartesian coordinate system, and c is the reciprocal of the corresponding radius R of the lens surface.
In the optical system with small zoom, large image plane and large aperture, the distance between the first lens group and the diaphragm can be adjusted within the range of 19.41mm to 1.83mm, and the distance between the second lens group and the diaphragm can be adjusted within the range of 11.035mm to 0.43 mm.
Compared with the prior art, the invention has the following technical characteristics:
1. most of zoom lenses in the current market adopt more glass spherical and aspherical lenses for realizing high-definition image quality, large aperture and infrared confocal, so that the cost is high. The invention reasonably considers the lens layout and controls the cost.
2. In the conventional zoom lens in the market, the image quality is greatly reduced when the zoom lens is switched to an infrared imaging mode under the condition of full focusing in a visible wave band, or infrared confocal is realized only in a smaller focal length section. The invention realizes complete confocal of visible wave band and infrared wave band, and ensures imaging definition of the visible wave band and the infrared wave band in the 6.6-19mm zooming process.
3. Most varifocal lenses in the current market, particularly lenses with focal length larger than 10mm, can generate virtual focus at normal temperature of 20 ℃ or at high temperature of 70 ℃ or at low temperature of-30 ℃ and get confused. The invention ensures the complete confocal of each multiplying power at high and low temperature.
4. Most of the zoom lenses in the current market have smaller image surfaces (generally smaller than phi 8.8 mm), so that the pixels with the same pixel size are lower, and the definition effect of the picture cannot reach the expectations. The image plane of the invention can reach phi 13.1mm, the corresponding resolution can reach more than 4K, and the whole process from low power to high power can shoot the image with clear whole picture and high contrast.
[ Description of the drawings ]
The invention is described in further detail below with reference to the attached drawing figures, wherein:
Fig. 1 is a schematic structural view of the present invention.
[ Detailed description ] of the invention
An optical system with small zooming, large image surface and large aperture comprises a first lens group 1, a diaphragm 2, a second lens group 3, a third lens group 4, an optical filter 5 and a photosensitive chip 6 which are sequentially arranged from an object plane to a phase plane, wherein the focal length of the third lens group 4 is negative, the third lens group 4 is fixed relative to the photosensitive chip 6, the focal length of the first lens group 1 is negative, the first lens group 1 can move back and forth along the object image direction relative to the photosensitive chip 6, the focal length of the second lens group 3 is positive, the second lens group 3 can move back and forth along the object image direction relative to the photosensitive chip 6, the second lens group 3 comprises a fourth lens 31, a fifth lens 32, a sixth lens 33, a seventh lens 34, an eighth lens 35 and a ninth lens 36 which are sequentially arranged along the object image direction, and the fourth lens 31 and the ninth lens 36 adopt glass aspheric lenses.
The powers of the fourth lens 31, the fifth lens 32, the seventh lens 34, and the ninth lens 36 are positive values, the power of the eighth lens 35 is negative values, and the power of the sixth lens 33 is positive or negative values.
The first lens group 1 includes a first lens 11, a second lens 12, and a third lens 13, which are sequentially disposed in the object-image direction, and the third lens group 4 includes a tenth lens 41, an eleventh lens 42, and a twelfth lens 43, which are sequentially disposed in the object-image direction, and the first lens 11, the second lens 12, the third lens 13, the fifth lens 32, the sixth lens 33, the seventh lens 34, the eighth lens 35, the tenth lens 41, the eleventh lens 42, and the twelfth lens 43 each employ a glass spherical lens.
The second lens 12 and the third lens 13 are bonded together by using optical glue, and the seventh lens 34 and the eighth lens 35 are bonded together by using optical glue.
The aspherical surface patterns of the fourth lens 31 and the ninth lens 36 satisfy the following equations:
Wherein k, a 1、a2、a3、a4、a5、a6、a7 and a 8 are aspheric coefficients, Z and y are the coordinates of the lens surface on the horizontal axis and the coordinates of the lens surface on the vertical axis in a Cartesian coordinate system, and c is the reciprocal of the corresponding radius R of the lens surface, i.e. c=1/R.
The distance between the first lens group 1 and the diaphragm 2 is adjustable in the range of 19.41mm to 1.83mm, and the distance between the second lens group 3 and the diaphragm 2 is adjustable in the range of 11.035mm to 0.43 mm.
The following are specific parameters of the preferred embodiments of the present invention:
aspheric coefficients of the respective surfaces of the fourth lens 31 and the ninth lens 36:
in order to realize complete infrared confocal, the complementation of refractive indexes and Abbe numbers of different lens materials is fully considered in design, and under the condition of ensuring small visible band chromatic aberration, the resolution effect of an infrared band is ensured, so that the perfect collocation of the lens materials is realized.
In order to realize ultra-high resolution, control of purple fringing and full-magnification confocal of infrared, the conjugate distance change amount of the first lens group 1 and the conjugate distance change amount after longitudinal amplification of the second lens group 3 are adopted to offset, so that image plane compensation is realized. The first lens group 1 adopts a single lens and a cemented lens to be matched for use, so that chromatic aberration of a lens can be well corrected, infrared confocal is ensured, and spherical aberration and sine difference at high-power positions can be corrected. The lens of the second lens group 3 is matched, a glass aspheric surface and a gluing-like structure are used behind the diaphragm 2, and the lens is of a perfect achromatic structure, so that high-order aberration correction is realized, chromatic aberration correction is guaranteed, chromatic aberration of the whole system is eliminated, aberration of the whole system is balanced well, and chromatic aberration correction is realized. The lens of the third lens group 4 is matched with the first lens group 1 to form a symmetrical structure, and the chromatic aberration and each aberration can be well corrected. The definition of the whole system is ensured, and the ultra-high definition resolution and the full-multiplying power complete confocal of infrared are realized. Finally, a certain vignetting is arranged, and peripheral stray light rays can be blocked under the condition that the illumination of the image plane is not influenced, so that the resolution of the center of the image plane is high, and meanwhile, the edge can reach high resolution.
In order to realize high-low temperature confocal of the system, the changes of the refractive index and the Abbe number of various glass materials at high and low temperatures are fully considered in the design process, meanwhile, the changes of the matching surface type and the air interval are changed, and the matching of all elements at high and low temperatures is realized, so that the synchronization and the definition of the image surfaces at high and low temperatures are realized.
Claims (4)
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911140675.5A CN111025610B (en) | 2019-11-20 | 2019-11-20 | An optical system with small zoom, large image surface and large aperture |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911140675.5A CN111025610B (en) | 2019-11-20 | 2019-11-20 | An optical system with small zoom, large image surface and large aperture |
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| CN111025610A CN111025610A (en) | 2020-04-17 |
| CN111025610B true CN111025610B (en) | 2025-01-07 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112180553B (en) * | 2020-10-14 | 2024-11-26 | 中山联合光电科技股份有限公司 | An optical lens system |
| CN112346212A (en) * | 2020-11-19 | 2021-02-09 | 中山联合光电科技股份有限公司 | Optical lens system |
| CN113671678B (en) * | 2021-08-13 | 2022-09-09 | 浙江舜宇光学有限公司 | Zoom lens |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06230286A (en) * | 1993-02-04 | 1994-08-19 | Canon Inc | Zoom lens |
| CN211149049U (en) * | 2019-11-20 | 2020-07-31 | 中山联合光电科技股份有限公司 | An optical system with small zoom, large image area and large aperture |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4578869B2 (en) * | 2004-06-24 | 2010-11-10 | 富士フイルム株式会社 | 3 group zoom lens |
| JP5280705B2 (en) * | 2008-02-29 | 2013-09-04 | 富士フイルム株式会社 | Magnification optical system and imaging device |
| JP2010091948A (en) * | 2008-10-10 | 2010-04-22 | Olympus Imaging Corp | Zoom lens and imaging apparatus having the same |
| JP5500382B2 (en) * | 2010-09-22 | 2014-05-21 | 株式会社ニコン | Photographic lens, optical apparatus having the photographic lens, and method of manufacturing the photographic lens |
| WO2014038147A1 (en) * | 2012-09-05 | 2014-03-13 | 富士フイルム株式会社 | Zoom lens and imaging device |
| CN205003350U (en) * | 2015-09-22 | 2016-01-27 | 江苏大学 | Super wide angle zoom |
| WO2017145208A1 (en) * | 2016-02-24 | 2017-08-31 | パナソニックＩｐマネジメント株式会社 | Zoom lens system, image pickup device having zoom lens system, and vehicle having image pickup device |
| CN108363192A (en) * | 2018-04-19 | 2018-08-03 | 中山联合光电科技股份有限公司 | A kind of ultra high-definition, small size, middle focal length varifocal optical system |
| CN110058388A (en) * | 2019-04-30 | 2019-07-26 | 中山联合光电科技股份有限公司 | A kind of variable-focus optical system for monitoring |
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2019
- 2019-11-20 CN CN201911140675.5A patent/CN111025610B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06230286A (en) * | 1993-02-04 | 1994-08-19 | Canon Inc | Zoom lens |
| CN211149049U (en) * | 2019-11-20 | 2020-07-31 | 中山联合光电科技股份有限公司 | An optical system with small zoom, large image area and large aperture |
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