CN102323657A - Monitoring lens - Google Patents
Monitoring lens Download PDFInfo
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- CN102323657A CN102323657A CN201110307280A CN201110307280A CN102323657A CN 102323657 A CN102323657 A CN 102323657A CN 201110307280 A CN201110307280 A CN 201110307280A CN 201110307280 A CN201110307280 A CN 201110307280A CN 102323657 A CN102323657 A CN 102323657A
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Abstract
The invention relates to a monitoring lens. From one side facing an object, the monitoring lens is provided with a first lens element, a second lens element, a third lens element, a diaphragm, a fourth lens element and a lens component in turn, wherein the first lens element has negative focal power, faces an object convexly, and is in a crescent shape; the second lens element has the negative focal power and is in a concavo-concave shape or the crescent shape; the third lens element has positive focal power and is in the concavo-concave shape; the diaphragm is arranged behind the third lens element; the fourth lens element has the positive focal power and is in concavo-concave shape; the lens component is formed by jointing a fifth lens and a sixth lens and has the positive focal power, wherein the fifth lens element having the positive focal power is close to the fourth lens element; and the sixth lens element having the negative focal power is positioned behind the fifth lens element. The invention provides a day and night dual-purpose high-resolution monitoring lens which has a compact structure, a large viewing angle, high imaging quality, non-focal plane drift of visible light and near infrared light, and low production process requirement aiming at overcoming the defect in the prior art.
Description
[technical field]
The present invention relates to a kind of day and night type high definition safety monitoring lens system, be particularly suitable for safety monitoring camera and the drive recorder image system objective body kept watch on under the night low-light (level).
[background technology]
Along with the rapid emergence in safety monitoring market in this year, digital handle and the optimization of network transfer speeds promotes, the quality requirements of safety monitoring camera lens is improved the discriminating from common supervision demand to high definition greatly.Under the details in a play not acted out on stage, but told through dialogues environment of low-light (level), adopt the near infrared floor light to require the clear bright and sharp of picture equally.
The safety monitoring camera lens is general at present adopts 4 to 8 eyeglasses to form; But this wide-angle safety monitoring Lens is bigger; Resolution can not satisfy the needs of the above CCD of mega pixel, and image quality is smudgy especially under the low-light (level) environment can not satisfy customer requirement small size and high performance requirement.Therefore, adopt the plastic aspherical element technology, with weight reduction, cost with reduce deflection, but its logical optical property a little less than, Tool and Die Technology is strict, influenced greatly by ambient temperature, can't satisfy to keep perfect imaging definition.
[summary of the invention]
The present invention seeks to overcome deficiency of the prior art and a kind of compact conformation is provided, field angle is big, image quality is high, the focal plane drift of visible light and near infrared light, day and night type high resolving power watching lens that manufacturing technique requirent is low.
In order to solve the technical matters of above-mentioned existence, the present invention adopts following technical proposal:
Watching lens is characterized in that beginning to be provided with successively from the side towards thing:
Have negative focal power and protruding first lens element 1 that is falcate towards object space;
Has the 3rd lenticular lens element 3 of being of positive focal power;
Be provided with aperture member 4 in the 3rd lens element 3 back;
Has the 4th lenticular lens element 5 of being of positive focal power;
Engage the lens subassembly of forming by the 5th lens element 6 and the 6th lens element 7 with positive light coke; The 5th lens element 6 that wherein has positive light coke is near the 4th lens element 5, and the 6th lens element 7 with negative power is in the 5th lens element 6 back.
Aforesaid watching lens is characterized in that with the aperture member being that the boundary is divided into forward and backward two groups to camera lens, and wherein preceding set of contact lenses combined focal length is used f
fExpression, back set of contact lenses combined focal length is used f
bExpression, then two groups of combined focal length ratios meet the following conditions :-2≤f
f/ f
b≤-0.6.
Aforesaid watching lens, set of contact lenses combined focal length f before it is characterized in that
rF meets the following conditions with this camera lens effective focal length :-3≤f
f/ f≤-1.8.
Aforesaid watching lens, set of contact lenses combined focal length f before it is characterized in that
bF meets the following conditions with this camera lens effective focal length: 1≤f
b/ f≤2.6.
Aforesaid watching lens; The back work distance that it is characterized in that said camera lens meets the following conditions from d and camera lens effective focal length f: 1.8≤d/f≤3; Wherein d is BFL, and BFL is the distance of the 5th lens element picture side side outermost point to imaging surface of said wide-angle safety monitoring camera lens.
Aforesaid watching lens, it is characterized in that said aperture member 4 between the 3rd lens element 3 and the 4th lens element 5 and aperture member 4 near the 4th lens element 5 one sides.
Aforesaid watching lens is characterized in that said the 3rd lens abbe number Vd less than 24, and said the 4th index of refraction in lens Nd is greater than 1.8.
Aforesaid watching lens is characterized in that said the 3rd lens element 3 and the 4th lens element 4 satisfy following relation condition: 1≤t/f≤2 for thick lens and center of lens thickness t and lens focus f.
Aforesaid watching lens, the focal power that it is characterized in that said lens subassembly is a positive light coke, the convex surface on this lens subassembly composition surface is side towards picture side; This lens construction f-number F#≤2.0, this lens construction field angle FOV>=120 °, first lens element 1 is the convex surface that is used for control system distortion size towards the r1 face of object plane.
Aforesaid watching lens, it is characterized in that said first, second, third and fourth, the spectral transmittance of five, six lens elements is to visible light F, d, C and near infrared spectrum all have good permeability; Spectral transmittance is to visible light F, and d, C and near infrared spectrum carry out aberration correction; Realize that visible light and near infrared light wave band focus on same focal plane; Wherein the optical wavelength of F is the visible light of 486nm, and the optical wavelength of d is the visible light of 588nm, and the optical wavelength of C is the visible light of 685nm; And the optical wavelength of near infrared light is 830nm or 850nm or 870nm.
The present invention compared with prior art has following advantage:
The invention solves the problems referred to above; It comprises six lens elements and diaphragm, by the thing side to being as side: have negative power and convex surface and form towards first lens element of object space, second lens element, the 3rd lens element, the lens subassembly that has the 3rd lens element of positive light coke and have a positive light coke with positive light coke with negative power.Aperture member is between the 3rd lens element and the 4th lens element and near the 4th lens element one side.
Through this configuration; Just eyeglass quantity that can enough minimums reaches gratifying optical characteristics, than wide visual field angle, bigger f-number and less portrait distortion; Realized visible light and near infrared while aberration correction are realized mega pixel high definition image quality imaging requirements.
[description of drawings]
Fig. 1 is a structural representation of the present invention, (object space is in left-most position, is in right-most position as the side).
Fig. 2 is the axial chromatic aberration curve map of visible light part of the present invention.
Fig. 3 is the axial chromatic aberration curve map of infrared light part of the present invention.
Fig. 4 is the chromatic longitudiinal aberration curve map of visible light part of the present invention.
Fig. 5 is the chromatic longitudiinal aberration curve map of infrared light part of the present invention.
Fig. 6 is the astigmatism and the distortion curve figure of visible light part of the present invention.
Fig. 7 is the astigmatism and the distortion curve figure of infrared light part of the present invention.
Fig. 8 is the MTF curve map of visible light part of the present invention.
Fig. 9 is the MTF curve map of infrared light part of the present invention.
[embodiment]
Describe the present invention below in conjunction with accompanying drawing:
As shown in the figure, watching lens begins to be provided with successively from the side towards thing:
Have negative focal power and protruding first lens element 1 that is falcate towards object space.Second lens element 2 that is concave-concave or falcate with negative focal power.Has the 3rd lenticular lens element 3 of being of positive focal power.Be provided with aperture member 4 in the 3rd lens element 3 back.Has the 4th lenticular lens element 5 of being of positive focal power.
Engage the lens subassembly of forming by the 5th lens element 6 and the 6th lens element 7 with positive light coke; The 5th lens element 6 that wherein has positive light coke is near the 4th lens element 5, and the 6th lens element 7 with negative power is in the 5th lens element 6 back.In addition, also include infrared fileter 8 and imaging surface 9.
Specifically, first lens element 1, it has negative focal power, is that the two sides all is a sphere, and is convex surface towards object plane r1 face, is the glass lens element of concave surface towards image planes r2 face.
The 3rd lens element 3, it has positive focal power, is that the two sides all is the convex surface sphere, and is convex surface towards object plane r5 face, is the glass lens element of convex surface towards image planes r6 face.
The 4th lens element 5, it has positive focal power, is that the two sides all is a convex surface, and is convex surface towards object plane r8 face, is the glass lens element of convex surface towards image planes r9 face.
The 5th lens element 6, it has positive focal power, is the two sides convex surface, and is convex surface towards object plane r10 face, is the spherical lens elements of concave surface towards image planes r11 face.
The 6th lens element 7; It has negative focal power; Be that the two sides all is the falcate sphere; And towards object plane r11 face is concave surface, is the glass lens element of convex surface towards image planes r12 face, and the 5th lens element and the 6th passes through element and closes towards the face that connects as square side through convex surface and carry out the joint lens combination that bonding composition has positive light coke.
With aperture member 4 is that the boundary is divided into forward and backward two groups to camera lens, and promptly the side near thing is preceding set of contact lenses, is the back set of contact lenses near a side of picture.Wherein preceding set of contact lenses combined focal length is used f
fExpression, back set of contact lenses combined focal length is used f
bExpression, then two groups of combined focal length ratios meet the following conditions :-2≤f
f/ f
b≤-0.6.
In addition, preceding set of contact lenses combined focal length f
fF meets the following conditions with this camera lens effective focal length :-3≤f
f/ f≤-1.8.
In addition, preceding set of contact lenses combined focal length f
bF meets the following conditions with this camera lens effective focal length: 1≤f
b/ f≤2.6.
The back work distance of said camera lens meets the following conditions from d and camera lens effective focal length f: 1.8≤d/f≤3, and wherein d is BFL, BFL is the distance of the 5th lens element picture side side outermost point to imaging surface of said wide-angle safety monitoring camera lens.
Said aperture member 4 is between the 3rd lens element 3 and the 4th lens element 5, and aperture member 4 is near the 4th lens element 5 one sides.Said the 3rd lens abbe number Vd is less than 24, and said the 4th index of refraction in lens Nd is greater than 1.8.
Said the 3rd lens element 3 and the 4th lens element 4 satisfy following relation condition: 1≤t/f≤2 for thick lens and center of lens thickness t and lens focus f.
The focal power of said lens subassembly is a positive light coke, and the convex surface on this lens subassembly composition surface is side towards picture side; This lens construction f-number F#≤2.0, this lens construction field angle FOV>=120 °, first lens element 1 is the convex surface that is used for control system distortion size towards the r1 face of object plane.
Said first, second, third and fourth, the spectral transmittance of five, six lens elements is to visible light F, d, C and near infrared spectrum all have good permeability.Spectral transmittance is to visible light F, and d, C and near infrared spectrum carry out aberration correction, realizes that visible light and near infrared light wave band focus on same focal plane.Wherein the optical wavelength of F is the visible light of 486nm, and the optical wavelength of d is the visible light of 588nm, and the optical wavelength of C is the visible light of 685nm; And the optical wavelength of near infrared light is 830nm or 850nm or 870nm.
Fig. 2 to Fig. 9 should be in the optical performance curve figure of case study on implementation, wherein for the present invention:
Fig. 2 is that visible light section axial chromatic curve figure also can be the spherical aberration curve map, and by F, d, CF=0.486um commonly used, d=0.588um, the wavelength of C=0.656um three coloured light represent that unit is millimeter mm.
Fig. 3 is that infrared light section axial chromatic curve figure also can be the spherical aberration curve map, and by near-infrared light waves W1=0.83um commonly used, W2=0.85um, the wavelength of W3=0.87um three coloured light represent that unit is millimeter mm.
Fig. 4 is a visible light part chromatic longitudiinal aberration curve, is represented by the wavelength of F commonly used, d, C three coloured light, and unit is micron um.
Fig. 5 is an infrared light chromatic longitudiinal aberration curve, is represented by the wavelength of near infrared three coloured light commonly used, and unit is micron um.
Fig. 6 is visible light part astigmatism and distortion curve figure, representes that by the wavelength of F commonly used, d, C three coloured light unit is mm, and distortion curve figure representes the distortion sizes values under the different field angle situation, and unit is %.
Fig. 7 is infrared light part astigmatism and distortion curve figure, representes that by the wavelength of near infrared three coloured light commonly used unit is mm, and distortion curve figure representes the distortion sizes values under the different field angle situation, and unit is %.
Fig. 8 is a visible light part MTF curve map, has represented the picture level of comprehensively separating of an optical system.Can know that by figure this optical lens is with various aberration corrections to a level preferably.
Fig. 9 is an infrared light part MTF curve map, has represented the picture level of comprehensively separating of an optical system.Can know that by figure this optical lens is with various aberration corrections to a level preferably.
In case study on implementation of the present invention, the whole focal length value of this optical lens is EFL, and f-number is FNO, and field angle is FOV; Camera lens length overall TTL, and begin by the object space side, with each minute surface number consecutively; The minute surface of first lens element is r1, r2, and the minute surface of second lens element is r3, r4, and the minute surface of prismatic glasses element is r5, r6; The diaphragm face is r7, and the minute surface of the 4th lens element is r8, r9, and the minute surface of the 5th lens element is r10, r11; The minute surface of the 6th lens element is r11, r12, and the minute surface that passes through infrared fileter 8 is r13, r14, and is the spherical glass structure.
Preferred parameter value table one of the present invention:
EFL＝1.0mm，FNO＝2.06，FOV＝121°，TTL＝7.86mm
Claims (10)
1. watching lens is characterized in that beginning to be provided with successively from the side towards thing:
Have negative focal power and protruding first lens element (1) that is falcate towards object space;
Second lens element (2) that is concave-concave or falcate with negative focal power;
Has lenticular the 3rd lens element (3) of being of positive focal power;
Be provided with aperture member (4) in the 3rd lens element (3) back;
Has lenticular the 4th lens element (5) of being of positive focal power;
Engage the lens subassembly of forming by the 5th lens element (6) and the 6th lens element (7) with positive light coke; The 5th lens element (6) that wherein has positive light coke is near the 4th lens element (5), and the 6th lens element (7) with negative power at the 5th lens element (6) at the back.
2. watching lens according to claim 1 is characterized in that with the aperture member being that the boundary is divided into forward and backward two groups to camera lens, and wherein preceding set of contact lenses combined focal length is used f
fExpression, back set of contact lenses combined focal length is used f
bExpression, then two groups of combined focal length ratios meet the following conditions :-2≤f
f/ f
b≤-0.6.
3. watching lens according to claim 2, set of contact lenses combined focal length f before it is characterized in that
fF meets the following conditions with this camera lens effective focal length :-3≤f
f/ f≤-1.8.
4. watching lens according to claim 2, set of contact lenses combined focal length f before it is characterized in that
bF meets the following conditions with this camera lens effective focal length: 1≤f
b/ f≤2.6.
5. according to claim 2 or 3 or 4 described watching lens; The back work distance that it is characterized in that said camera lens meets the following conditions from d and camera lens effective focal length f: 1.8≤d/f≤3; Wherein d is BFL, and BFL is the distance of the 5th lens element picture side side outermost point to imaging surface of said wide-angle safety monitoring camera lens.
6. according to claim 2 or 3 or 4 described watching lens, it is characterized in that said aperture member (4) is positioned between the 3rd lens element (3) and the 4th lens element (5), and aperture member (4) is near the 4th lens element (5) one sides.
7. according to claim 2 or 3 or 4 described watching lens, it is characterized in that said the 3rd lens abbe number Vd less than 24, said the 4th index of refraction in lens Nd is greater than 1.8.
8. according to claim 2 or 3 or 4 described watching lens, it is characterized in that said the 3rd lens element (3) and the 4th lens element (4) satisfy following relation condition: 1≤t/f≤2 for thick lens and center of lens thickness t and lens focus f.
9. according to claim 2 or 3 or 4 described watching lens, the focal power that it is characterized in that said lens subassembly is a positive light coke, and the convex surface on this lens subassembly composition surface is side towards picture side; This lens construction f-number F#≤2.0, this lens construction field angle FOV>=120 °, first lens element (1) is the convex surface that is used for control system distortion size towards the r1 face of object plane.
10. according to claim 2 or 3 or 4 described watching lens, it is characterized in that said first, second, third and fourth, the spectral transmittance of five, six lens elements is to visible light F, d, C and near infrared spectrum all have good permeability; Spectral transmittance is to visible light F, and d, C and near infrared spectrum carry out aberration correction; Realize that visible light and near infrared light wave band focus on same focal plane; Wherein the optical wavelength of F is the visible light of 486nm, and the optical wavelength of d is the visible light of 588nm, and the optical wavelength of C is the visible light of 685nm; And the optical wavelength of near infrared light is 830nm or 850nm or 870nm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110307280A CN102323657A (en) | 2011-10-12 | 2011-10-12 | Monitoring lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110307280A CN102323657A (en) | 2011-10-12 | 2011-10-12 | Monitoring lens |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102323657A true CN102323657A (en) | 2012-01-18 |
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|---|---|---|---|
| CN201110307280A Pending CN102323657A (en) | 2011-10-12 | 2011-10-12 | Monitoring lens |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105068219A (en) * | 2015-09-21 | 2015-11-18 | 福建福光股份有限公司 | High-resolution fisheye lens for day and night use and focusing method thereof |
| CN105182505A (en) * | 2015-09-06 | 2015-12-23 | 舜宇光学(中山)有限公司 | Panoramic optical lens and panoramic optical lens device |
| CN106772958A (en) * | 2016-12-27 | 2017-05-31 | 东莞市宇瞳光学科技股份有限公司 | A kind of small-sized tight shot of short focus ultra-wide angle |
| CN111158122A (en) * | 2017-03-01 | 2020-05-15 | 大立光电股份有限公司 | Optical image lens system, image capturing device and electronic device |
| TWI703368B (en) * | 2018-02-08 | 2020-09-01 | 先進光電科技股份有限公司 | Optical image capturing system |
| TWI703369B (en) * | 2018-02-08 | 2020-09-01 | 先進光電科技股份有限公司 | Optical image capturing system |
| TWI703367B (en) * | 2018-02-08 | 2020-09-01 | 先進光電科技股份有限公司 | Optical image capturing system |
| TWI703363B (en) * | 2018-02-08 | 2020-09-01 | 先進光電科技股份有限公司 | Optical image capturing system |
| WO2021184212A1 (en) * | 2020-03-17 | 2021-09-23 | 天津欧菲光电有限公司 | Optical lens, imaging module, electronic device, and driving device |
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| EP1734393A1 (en) * | 2005-06-15 | 2006-12-20 | Ricoh Company, Ltd. | Photographic optical system, photocographic lens unit, camera and mobile information terminal |
| TWI300143B (en) * | 2005-07-22 | 2008-08-21 | Optronics Technology Inc A | |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105182505A (en) * | 2015-09-06 | 2015-12-23 | 舜宇光学(中山)有限公司 | Panoramic optical lens and panoramic optical lens device |
| CN105068219A (en) * | 2015-09-21 | 2015-11-18 | 福建福光股份有限公司 | High-resolution fisheye lens for day and night use and focusing method thereof |
| CN105068219B (en) * | 2015-09-21 | 2018-06-26 | 福建福光股份有限公司 | A kind of high resolution day and night fish eye lens and its focus adjustment method |
| CN106772958A (en) * | 2016-12-27 | 2017-05-31 | 东莞市宇瞳光学科技股份有限公司 | A kind of small-sized tight shot of short focus ultra-wide angle |
| CN111158122A (en) * | 2017-03-01 | 2020-05-15 | 大立光电股份有限公司 | Optical image lens system, image capturing device and electronic device |
| CN111158122B (en) * | 2017-03-01 | 2021-12-17 | 大立光电股份有限公司 | Optical image lens system, image capturing device and electronic device |
| TWI703368B (en) * | 2018-02-08 | 2020-09-01 | 先進光電科技股份有限公司 | Optical image capturing system |
| TWI703369B (en) * | 2018-02-08 | 2020-09-01 | 先進光電科技股份有限公司 | Optical image capturing system |
| TWI703367B (en) * | 2018-02-08 | 2020-09-01 | 先進光電科技股份有限公司 | Optical image capturing system |
| TWI703363B (en) * | 2018-02-08 | 2020-09-01 | 先進光電科技股份有限公司 | Optical image capturing system |
| WO2021184212A1 (en) * | 2020-03-17 | 2021-09-23 | 天津欧菲光电有限公司 | Optical lens, imaging module, electronic device, and driving device |
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Application publication date: 20120118 |