CN105204140A - High-definition super wide angle prime lens - Google Patents

High-definition super wide angle prime lens Download PDF

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Publication number
CN105204140A
CN105204140A CN201510719494.3A CN201510719494A CN105204140A CN 105204140 A CN105204140 A CN 105204140A CN 201510719494 A CN201510719494 A CN 201510719494A CN 105204140 A CN105204140 A CN 105204140A
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China
Prior art keywords
lens
wide angle
focal length
lenses
focal power
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CN201510719494.3A
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Chinese (zh)
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CN105204140B (en
Inventor
张品光
邹文镔
毛才荧
何剑炜
吴峰
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东莞市宇瞳光学科技有限公司
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    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B13/00Optical objectives specially designed for the purposes specified below
    • G02B13/001Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
    • G02B13/0015Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
    • G02B13/002Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B1/00Optical elements characterised by the material of which they are made
    • G02B1/04Optical elements characterised by the material of which they are made made of organic materials, e.g. plastics
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B13/00Optical objectives specially designed for the purposes specified below
    • G02B13/001Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
    • G02B13/0015Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
    • G02B13/002Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
    • G02B13/0045Miniaturised 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
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B13/00Optical objectives specially designed for the purposes specified below
    • G02B13/06Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces

Abstract

The invention belongs to the technical field of lenses, particularly to a high-definition super wide angle prime lens which comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens which are sequentially arranged from the object space to the image space, wherein the fourth lens and the fifth lens adopt plastic aspherical lenses; the first lens, the second lens, the third lens and the sixth lens are glass spherical lenses; the first lens is a convex-concave negative focal power lens; the second lens is a bi-concave negative focal power lens; the third lens is a bi-convex positive focal power lens; the fourth lens is a bi-convex positive focal power lens; the fifth lens is a bi-concave negative focal power lens; the sixth lens is a bi-convex positive focal power lens. According to the high-definition super wide angle prime lens, glass lenses and plastic lenses are reasonably combined, so that a large aperture is realized, the imaging quality is good, 4 megapixel can be realized under the precondition that infrared does not focus again, and clear and bright monitoring pictures can be realized even at night with a low illumination level; the lens has a temperature compensation function, and can be used at the temperature of minus 30 DEG C-80 DEG C without being out of focus.

Description

A kind of high definition ultra-wide angle tight shot
Technical field
The invention belongs to lens technology field, particularly relate to a kind of high definition ultra-wide angle tight shot.
Background technology
2.8mm camera lens is widely used in the occasion needing the large visual field to monitor, and market demand is very big.Traditional 2.8mm camera lens is generally full glass mirror, due to field angle very large (usual maximum field of view angle can reach more than 140 °), causes its edge picture element to be difficult to be guaranteed.
The 2.8mm of current high definition possesses the glass mirror of more than 6 pieces usually, and visible ray resolution is more than 2,000,000, and infrared resolution rate is more than 1,000,000.Along with the requirement of development people to sharpness of technology is more and more higher, the chip of 4,000,000, five mega pixels emerges in an endless stream, and therefore needs a resolution can reach the 2.8mm camera lens of five mega pixels.If by traditional thinking, generally have two kinds of ways to improve resolution: one is adopt less eyeglass to reduce clear aperature, and two is adopt more eyeglass.
Adopt more eyeglass no doubt can promote the performance of camera lens, but the thing followed is the increase of cost.Cost can be made to reduce although clear aperature is reduced in employing, lens imaging Quality Down can be caused.When adopting full glass mirror to design as can be seen here, visible ray and infrared light confocal imaging camera lens directly cannot average out on Cost And Performance.
And for 2.8mm tight shot, still need and will solve following technical barrier:
The first, visible ray is identical with infrared light focal length.
Monitoring camera is all in running order with night by day, the mainly natural light of the illumination employing on daytime, therefore the light mainly visible ray that daytime, object sent, then need night to use infrared light floor light, the light that therefore night, object sent is infrared light or the mixing light that is made up of infrared light and visible ray mainly.And due to visible ray (wavelength is for 550nm) and the refractive index of infrared light (wavelength is for 850nm) in same optical glass, optics plastic cement different, this often causes the focal position of the focal position of visible ray and infrared light different, that is by visual light imaging after lens imaging clearly position and near infrared imaging position is different clearly.The common monitoring camera which results on the market is difficult to take into account the imaging clearly of day and night.
The second, when variation of ambient temperature time, camera lens does not need again to focus and just can ensure imaging clearly.
Monitoring camera is widely used in indoor, outdoor, and 1 year 365 day 24 hours every day is in running order, and the variation of ambient temperature residing for camera lens is huge.The typical operating temperature requirements of monitoring camera is-30 DEG C ~ 80 DEG C, and camera lens must ensure that imaging is still equally clear with 20 DEG C (normal temperature) in the scope that this temperature difference reaches more than 120 degree Celsius, when again not focusing.
Change due to the refractive index meeting temperature influence of eyeglass material, lens dimension, lens barrel material, microscope base material can be expanded with heat and contract with cold along with the change of temperature, these factors cause common monitoring camera under high and low temperature environment, there will be burnt (rear cut-off distance) after different imagings, are called the temperature drift of lens imaging.
In view of this, necessaryly provide a kind of high definition ultra-wide angle tight shot, it can realize large aperture (F1.8) by reasonable combination glass lens and plastic lens, image quality is good, visible ray resolution can reach five mega pixels, and makes infraredly under the prerequisite again do not focused on, also can reach four mega pixels, even if also can realize clear bright monitored picture at night under low-light (level), there is temperature compensation function simultaneously, use under the environment of-30 DEG C ~ 80 DEG C and also can not run Jiao.
Summary of the invention
The object of the invention is to: for the deficiencies in the prior art, and a kind of high definition ultra-wide angle tight shot is provided, it can realize large aperture (F1.8) by reasonable combination glass lens and plastic lens, image quality is good, visible ray resolution can reach five mega pixels, and make infraredly under the prerequisite again do not focused on, also can reach four mega pixels, even if clear bright monitored picture also can be realized at night under low-light (level), there is temperature compensation function simultaneously, use under the environment of-30 DEG C ~ 80 DEG C and also can not run Jiao.
In order to achieve the above object, the present invention adopts following technical scheme:
A kind of high definition ultra-wide angle tight shot, comprise the first lens, the second lens, the 3rd lens, the 4th lens, the 5th lens and the 6th lens that are arranged in order from the object side to the image side, described 4th lens and described 5th lens all adopt plastic cement aspherical lens, and described first lens, described second lens, described 3rd lens and described 6th lens are glass spherical lens;
Described first lens are convex-concave negative-power lenses, described second lens are concave-concave negative-power lenses, described 3rd lens are biconvex positive power lens, described 4th lens are biconvex positive power lens, described 5th lens are concave-concave negative-power lenses, and described 6th lens are biconvex positive power lens;
The ratio of described 4th lens and the described focal length of the 5th lens and the focal length of whole camera lens meets the following conditions:
1.55<|f4/f|<1.71;
1.29<|f5/f|<1.49;
Wherein, f is the focal length of whole camera lens; F4 is the focal length of described 4th lens, and f5 is the focal length of described 5th lens.
The cost of plastic lens far below glass spheric glass, so reduce cost; Again because the 4th lens of the present invention and the 5th lens all have employed aspherical lens, compare traditional spheric glass and improve performance; The more important thing is, the present invention, when have employed plastic cement aspherical lens, ensure that the very low temperature drift of camera lens optimum resolution image space.
Relative to prior art, the present invention uses the reasonable combination of four sheet glass spherical lenses and two panels plastic aspheric lenes to form six chip optical textures, large aperture (F1.8) can be realized, good imaging quality, make visible ray resolution can reach five mega pixels, and make infrared light under the prerequisite again do not focused on can reach the resolution of four mega pixels, even if also clear bright monitored picture can be realized under the condition of low-light (level) at night, and possess temperature compensation function, use under the environment of-30 DEG C ~ 80 DEG C and also can not run Jiao, that is, the present invention possesses day and night with burnt function, namely can to infrared light blur-free imaging without the need to focusing when visible ray becomes sharply defined image.And cost of the present invention is low, compact conformation, thus can average out on cost and performance, market outlook are extensive.
One as high definition ultra-wide angle tight shot of the present invention is improved, and described first lens meet the following conditions to the focal length of described 6th lens, refractive index and radius-of-curvature:
In upper table, " f " is focal length, and " n " is refractive index, and " R " is radius-of-curvature, and "-" number represents that direction is negative;
Wherein, f1 to f6 corresponds respectively to the focal length of the first lens to the 6th lens; N1 to n6 corresponds respectively to the refractive index of the first lens to the 6th lens; R1, R3, R5, R7, R9, R11 correspond respectively to the radius-of-curvature of the first lens to the one side of the close object space of the 6th lens, and R2, R4, R6, R8, R10, R12 correspond respectively to the radius-of-curvature of the first lens to the one side away from object space of the 6th lens.
One as high definition ultra-wide angle tight shot of the present invention is improved, and described first lens and described second lens are near assembling, and described second lens and described 3rd lens are by the first spacer ring close-fitting.
One as high definition ultra-wide angle tight shot of the present invention is improved, described 3rd lens and described 4th lens are by the second spacer ring close-fitting, described 4th lens and described 5th lens are by the 3rd spacer ring close-fitting, and described 5th lens and described 6th lens are by the 4th spacer ring close-fitting.
One as high definition ultra-wide angle tight shot of the present invention is improved, and is provided with diaphragm between described 3rd lens and described 4th lens.
One as high definition ultra-wide angle tight shot of the present invention is improved, according to aspherical equation formula:
Described 4th lens meet following relation:
In a word, the present invention compared with prior art has following advantage:
First, the present invention accomplished visible ray and infrared light confocal, under the prerequisite according to lens combination proposed by the invention, combination of materials, camera lens of the present invention to reach with the position of the imaging of infrared light (850nm) the position of visible ray (400nm ~ 650nm) imaging and overlaps.
The second, the present invention has temperature compensation function, and under the prerequisite according to lens combination proposed by the invention, combination of materials, camera lens of the present invention ensure that the optimum resolution image space of-30 DEG C ~ 80 DEG C of temperature range inner lenses is constant.
3rd, present invention employs plastic lens, accomplished low cost and high-performance, the 4th lens of the present invention and the 5th lens have employed plastic cement aspherical lens, the cost of plastic lens far below glass spheric glass, so reduce cost; Again because the 4th lens of the present invention and the 5th lens all have employed aspherical lens, compare traditional spheric glass and improve performance.In a word, the present invention makes full use of the advantage having played glass mirror and be easy to process and plastic aspherical element lens performance high cost is low, make camera lens visible ray resolution can reach five mega pixels, infrared resolution rate can reach four mega pixels, cost reduces greatly simultaneously, cost performance is excellent, has very high marketable value.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Embodiment
Below with reference to specific embodiment, the present invention and beneficial effect thereof are described in further detail, but the specific embodiment of the present invention is not limited thereto.
As shown in Figure 1, a kind of high definition ultra-wide angle tight shot provided by the invention, comprise the first lens 1, second lens 2, the 3rd lens 3, the 4th lens 4, the 5th lens 5 and the 6th lens 6 that are arranged in order from the object side to the image side, 4th lens 4 and the 5th lens 5 all adopt plastic cement aspherical lens, and the first lens 1, second lens 2, the 3rd lens 3 and the 6th lens 6 are glass spherical lens;
First lens 1 are convex-concave negative-power lenses, second lens 2 are concave-concave negative-power lenses, and the 3rd lens 3 are biconvex positive power lens, and the 4th lens 4 are biconvex positive power lens, 5th lens 5 are concave-concave negative-power lenses, and the 6th lens 6 are biconvex positive power lens;
The ratio of the focal length of the 4th lens 4 and the 5th lens 5 and the focal length of whole camera lens meets the following conditions:
1.55<|f4/f|<1.71;
1.29<|f5/f|<1.49;
Wherein, f is the focal length of whole camera lens; F4 is the focal length of the 4th lens, and f5 is the focal length of the 5th lens.
The cost of plastic lens far below glass spheric glass, so reduce cost; Again because the 4th lens 4 of the present invention and the 5th lens 5 all have employed aspherical lens, compare traditional spheric glass and improve performance; The more important thing is, the present invention, when have employed plastic cement aspherical lens, ensure that the very low temperature drift of camera lens optimum resolution image space.
In a word, the present invention uses the reasonable combination of four sheet glass spherical lenses and two panels plastic aspheric lenes to form six chip optical textures, large aperture (F1.8) can be realized, good imaging quality, make visible ray resolution can reach five mega pixels, and make infrared light under the prerequisite again do not focused on can reach the resolution of four mega pixels, even if also clear bright monitored picture can be realized under the condition of low-light (level) at night, and possess temperature compensation function, use under the environment of-30 DEG C ~ 80 DEG C and also can not run Jiao, that is, the present invention possesses day and night with burnt function, namely can to infrared light blur-free imaging without the need to focusing when visible ray becomes sharply defined image.And cost of the present invention is low, thus can average out on cost and performance, market outlook are extensive.
First lens 1 meet the following conditions to the focal length of the 6th lens 6, refractive index and radius-of-curvature:
In upper table, " f " is focal length, and " n " is refractive index, and " R " is radius-of-curvature, and "-" number represents that direction is negative;
Wherein, f1 to f6 corresponds respectively to the focal length of the first lens 1 to the 6th lens 6; N1 to n6 corresponds respectively to the refractive index of the first lens 1 to the 6th lens 6; R1, R3, R5, R7, R9, R11 correspond respectively to the radius-of-curvature of the first lens 1 to the one side of the close object space of the 6th lens 6, and R2, R4, R6, R8, R10, R12 correspond respectively to the radius-of-curvature of the first lens 1 to the one side away from object space of the 6th lens 6.
First lens 1 and the second lens 2 are near assembling, and the second lens 2 and the 3rd lens 3 are by the first spacer ring close-fitting.
3rd lens 3 and the 4th lens 4 are by the second spacer ring close-fitting, and the 4th lens 4 and the 5th lens 5 are by the 3rd spacer ring close-fitting, and the 5th lens 5 and the 6th lens 6 are by the 4th spacer ring close-fitting.
Diaphragm 7 is provided with between 3rd lens 3 and the 4th lens 4.
According to aspherical equation formula:
4th lens 4 meet following relation:
Embodiment 1
The six-element lens of this camera lens face type in totally ten two faces, radius-of-curvature, lens thickness, lens pitch, lens index and K value meets the following conditions respectively:
Table 1: the physical parameter of six-element lens.
In upper table, " R " is radius-of-curvature, "-" number represents that direction is negative, " PL " represents plane, upper table the same face sequence number existing refractive index data n, have again data D, data D represents the thickness at this lens axial line place, the same face sequence number only has data D and does not have refractive index data n, and data D represents the spacing of these lens to next lens face.1-12 is the face sequence number be arranged in order from the object side to the image side.
Wherein have the 7th of non-spherical structure the, 8,9, the shape on 10 surfaces can use following formulae express:
Wherein C=1/R
Table 2: 7th, the aspheric surface parameter on 8,9,10 surfaces.
The present invention can realize large aperture (F1.8) by reasonable combination glass lens and plastic lens, image quality is good, and make infraredly under the prerequisite again do not focused on, also can reach four mega pixels, even if clear bright monitored picture also can be realized at night under low-light (level), there is temperature compensation function simultaneously, use under the environment of-30 DEG C ~ 80 DEG C and also can not run Jiao.
In a word, the present invention compared with prior art has following advantage:
First, the present invention accomplished visible ray and infrared light confocal, under the prerequisite according to lens combination proposed by the invention, combination of materials, camera lens of the present invention to reach with the position of the imaging of infrared light (850nm) the position of visible ray (400nm ~ 650nm) imaging and overlaps.
The second, the present invention has temperature compensation function, and under the prerequisite according to lens combination proposed by the invention, combination of materials, camera lens of the present invention ensure that the optimum resolution image space of-30 DEG C ~ 80 DEG C of temperature range inner lenses is constant.
3rd, present invention employs plastic lens, accomplished low cost and high-performance, the 4th lens 4 of the present invention and the 5th lens 5 have employed plastic cement aspherical lens, the cost of plastic lens far below glass spheric glass, so reduce cost; Again because the 4th lens 4 of the present invention and the 5th lens 5 all have employed aspherical lens, compare traditional spheric glass and improve performance.
The announcement of book and instruction according to the above description, those skilled in the art in the invention can also carry out suitable change and amendment to above-mentioned embodiment.Therefore, the present invention is not limited to embodiment disclosed and described above, also should fall in the protection domain of claim of the present invention modifications and changes more of the present invention.In addition, although employ some specific terms in this instructions, these terms just for convenience of description, do not form any restriction to the present invention.

Claims (6)

1. a high definition ultra-wide angle tight shot, comprise the first lens, the second lens, the 3rd lens, the 4th lens, the 5th lens and the 6th lens that are arranged in order from the object side to the image side, it is characterized in that: described 4th lens and described 5th lens all adopt plastic cement aspherical lens, described first lens, described second lens, described 3rd lens and described 6th lens are glass spherical lens;
Described first lens are convex-concave negative-power lenses, described second lens are concave-concave negative-power lenses, described 3rd lens are biconvex positive power lens, described 4th lens are biconvex positive power lens, described 5th lens are concave-concave negative-power lenses, and described 6th lens are biconvex positive power lens;
The ratio of described 4th lens and the described focal length of the 5th lens and the focal length of whole camera lens meets the following conditions:
1.55<|f4/f|<1.71;
1.29<|f5/f|<1.49;
Wherein, f is the focal length of whole camera lens; F4 is the focal length of described 4th lens, and f5 is the focal length of described 5th lens.
2. high definition ultra-wide angle tight shot according to claim 1, is characterized in that: described first lens meet the following conditions to the focal length of described 6th lens, refractive index and radius-of-curvature:
In upper table, " f " is focal length, and " n " is refractive index, and " R " is radius-of-curvature, and "-" number represents that direction is negative;
Wherein, f1 to f6 corresponds respectively to the focal length of the first lens to the 6th lens; N1 to n6 corresponds respectively to the refractive index of the first lens to the 6th lens; R1, R3, R5, R7, R9, R11 correspond respectively to the radius-of-curvature of the first lens to the one side of the close object space of the 6th lens, and R2, R4, R6, R8, R10, R12 correspond respectively to the radius-of-curvature of the first lens to the one side away from object space of the 6th lens.
3. high definition ultra-wide angle tight shot according to claim 1, is characterized in that: described first lens and described second lens are near assembling, and described second lens and described 3rd lens are by the first spacer ring close-fitting.
4. high definition ultra-wide angle tight shot according to claim 3, it is characterized in that: described 3rd lens and described 4th lens are by the second spacer ring close-fitting, described 4th lens and described 5th lens are by the 3rd spacer ring close-fitting, and described 5th lens and described 6th lens are by the 4th spacer ring close-fitting.
5. high definition ultra-wide angle tight shot according to claim 1, is characterized in that: be provided with diaphragm between described 3rd lens and described 4th lens.
6. high definition ultra-wide angle tight shot according to claim 1, is characterized in that: according to aspherical equation formula:
Described 4th lens meet following relation:
CN201510719494.3A 2015-10-28 2015-10-28 A kind of tight shot CN105204140B (en)

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CN105589178A (en) * 2016-03-22 2016-05-18 中山联合光电科技股份有限公司 High-low temperature confocal and stray-light-free optical system
CN105589178B (en) * 2016-03-22 2018-06-01 中山联合光电科技股份有限公司 A kind of high/low temperature is confocal, without veiling glare optical system
CN105652416A (en) * 2016-04-14 2016-06-08 南京昂驰光电科技有限公司 Front optical set for starlight-grade road monitoring zoom camera lens
CN107797227A (en) * 2016-09-01 2018-03-13 先进光电科技股份有限公司 Optical imaging system
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CN106597639A (en) * 2016-12-19 2017-04-26 南阳师范学院 Glass-plastic composite lens fixed-focus fisheye lens
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CN110174744A (en) * 2018-02-19 2019-08-27 日本电产三协株式会社 Wide-angle lens
CN108873257B (en) * 2018-07-11 2021-02-26 大族激光科技产业集团股份有限公司 Lens group and laser processing equipment
CN108873257A (en) * 2018-07-11 2018-11-23 大族激光科技产业集团股份有限公司 Lens group and laser process equipment
WO2020073703A1 (en) * 2018-10-10 2020-04-16 浙江舜宇光学有限公司 Optical lens group
CN109788089A (en) * 2018-10-16 2019-05-21 华为技术有限公司 The method and terminal of microspur imaging
WO2020103555A1 (en) * 2018-11-23 2020-05-28 江西联创电子有限公司 Optical imaging lens and imaging device

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