CN202433591U - Wide-angle high-resolution security monitoring lens - Google Patents
Wide-angle high-resolution security monitoring lens Download PDFInfo
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- CN202433591U CN202433591U CN2011203861555U CN201120386155U CN202433591U CN 202433591 U CN202433591 U CN 202433591U CN 2011203861555 U CN2011203861555 U CN 2011203861555U CN 201120386155 U CN201120386155 U CN 201120386155U CN 202433591 U CN202433591 U CN 202433591U
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Abstract
The utility model relates to a wide-angle high-resolution security monitoring lens including a meniscus first lens element having negative focal power and protruding towards an object side; a spherical or non-spherical second lens element having negative focal power; a diaphragm arranged behind the second lens element; a spherical or non-spherical third lens element having positive focal power and used for correcting field curvature; and a lens assembly formed by jointing a fourth lens element and a fifth lens element and having positive focal power. The first lens element, the second lens element, the diaphragm, the third lens element and the lens assembly composed of the fourth lens element and the fifth lens element are arranged successively from the side facing towards an object, wherein 2.8 >= BFL/EFL >= 2.3. The BFL is a distance between an outmost point of an image side of the fifth lens element of the wide-angle high-resolution security monitoring lens and an imaging face. The EFL is a focal length value of the wide-angle high-resolution security monitoring lens. The wide-angle high-resolution security monitoring lens provided by the utility model overcomes shortcomings of the prior art, and is reasonable in cost, low in weight, small in size and has high definition, a long working distance and a wide working temperature range.
Description
[technical field]
The present invention relates to a kind of wide-angle high resolving power safety monitoring lens system, be particularly suitable for the camera lens operating distance is had relatively high expectations and the safety monitoring camera and the drive recorder image system of the serviceability temperature condition of broad are arranged.
[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.
The safety monitoring camera lens is general at present adopts 4 to 8 eyeglasses to form; It like Chinese patent number is 200910099703 wide-angle safety monitoring camera lens; Just adopt 4 sheet glass and 2 glass lens to form; But this wide-angle safety monitoring Lens is bigger, and is restricted in the high low temperature high humidity environment, can not satisfy customer requirement small size and high performance requirement.
For this reason; The wide-angle safety monitoring camera lens of enterprise's exploitation adopts the plastic aspherical element technology; With weight reduction, cost with reduce deflection, but its logical optical property a little less than, operating distance BFL is also shorter; And temperature compensation characteristic is not good, can't satisfy in-60 ℃ ~+85 ℃ temperature range, to keep perfectly imaging definition.
[summary of the invention]
The present invention seeks to overcome deficiency of the prior art and provide that a kind of cost is moderate, in light weight, size is little, the wide-angle safety monitoring camera lens of high-resolution and long operating distance and wide operating temperature range.
In order to solve the technical matters of above-mentioned existence, the present invention adopts following technical proposal:
A kind of wide-angle high resolving power safety monitoring camera lens begins to be provided with successively from the side towards thing:
Have the sphere of negative focal power or second lens element 2 of aspherical lens;
Be provided with aperture member 4 in second lens element, 2 back;
Have the sphere or the aspherical lens of positive focal power and be used to proofread and correct the 3rd lens element 3 of the curvature of field;
Engage the lens subassembly of forming with positive light coke by the 4th lens element 5 and the 5th lens element 6, the 4th lens element 5 that wherein has positive light coke is preceding, the 5th lens element 6 with negative power after;
It is characterized in that, 2.8 >=BFL/EFL >=2.3, wherein 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, EFL is the focal length value of said wide-angle high definition safety monitoring camera lens.
Aforesaid a kind of wide-angle high resolving power safety monitoring camera lens is characterized in that described first lens element 1 satisfies the following conditions formula:
Nd >=1.68; Vd >=52, wherein Nd representes the d optical index of the first lens element material, Vd representes the d light Abbe constant of the first lens element material; D only wavelength is the visible light of 588nm, and first lens unit is the convex surface that is used for control system distortion size towards the one side of thing.
Aforesaid a kind of wide-angle high resolving power safety monitoring camera lens is characterized in that described the 3rd lens element 3 satisfies the following conditions formula:
Nd >=1.85, Vd >=45, wherein Nd representes the d optical index of the 3rd lens element material, and Vd representes the d light Abbe constant of the 3rd lens element material, and d only wavelength is the visible light of 588nm, and the thickness of the 3rd lens unit 3 is greater than 4mm.
Aforesaid a kind of wide-angle high resolving power safety monitoring camera lens is characterized in that TTL/EFL≤8.5, and wherein TTL is the distance of first lens unit object space side outermost point to the imaging surface of said camera lens, and EFL is the focal length value of said camera lens.
Aforesaid a kind of wide-angle high resolving power safety monitoring camera lens is characterized in that described second lens element and the 5th lens element satisfy the following conditions formula:
3.5 >=F2/F5 >=2.8, wherein F2 representes the focal length value of second lens element, and F5 representes the focal length value of the 5th lens element.
Aforesaid a kind of wide-angle high resolving power safety monitoring camera lens is characterized in that described the 3rd lens element and the 4th lens element satisfy the following conditions formula:
-1.5 >=F2/F3 >=-2.2, wherein F2 representes the focal length value of second lens element, F3 representes the focal length value of the 3rd lens element.
Aforesaid a kind of wide-angle high resolving power safety monitoring camera lens is characterized in that FNO≤2.1 of the aperture member 4 of camera lens, and FNO representes the value of aperture size.
Aforesaid a kind of wide-angle high resolving power safety monitoring camera lens is characterized in that the maximum clear aperture of first lens element and corresponding imaging image height, field angle satisfy following condition formula:
D*H/FOV≤0.26, wherein FOV representes the maximum field of view angle of wide-angle safety monitoring camera lens, and D representes the maximum clear aperture of pairing first lens element of maximum FOV towards the object space convex surface, and H representes the pairing imaging image height of maximum FOV.
Aforesaid a kind of wide-angle high resolving power safety monitoring camera lens is characterized in that said the 4th lens element and the 5th lens element adopt glue to carry out bonding the joint and form a lens subassembly, and the convex surface on the composition surface of two lens elements is side towards picture side; And the 4th lens unit and the 5th lens unit composition surface satisfy following condition formula:
| R|＞Φ/2, wherein R is the curvature of centre radius on composition surface, Φ is the light effective aperture on composition surface.
Aforesaid a kind of wide-angle high resolving power safety monitoring camera lens is characterized in that the 4th lens unit and the 5th lens unit composition surface satisfy following condition formula: θ≤43 °, and wherein θ is the tangent line of any point on the composition surface and the angle of optical axis.
The present invention compared with prior art has following advantage:
The invention solves the problems referred to above; It comprises five lens elements and diaphragm, by the thing side to being as side: have negative power and convex surface towards first lens element of object space, have second lens element of negative power, just form by the 3rd lens element of positive light coke and joint lens subassembly with positive light coke.
Diaphragm and except that the first, the 5th lens element, has at least 1 piece to be aspherical lens between second lens element and the 3rd lens in all the other 2 pieces of lens elements.Through configuration like this, eyeglass quantity that just can enough minimums reaches gratifying optical characteristics, than wide visual field angle, bigger f-number and less portrait distortion.
[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 an axial chromatic aberration curve map of the present invention
Fig. 3 is a chromatic longitudiinal aberration curve map of the present invention
Fig. 4 is astigmatism of the present invention and distortion curve figure
Fig. 5 is a MTF curve map of the present invention.
[embodiment]
Describe the present invention below in conjunction with accompanying drawing:
As shown in the figure, a kind of wide-angle high resolving power safety monitoring camera lens begins to be provided with successively from the side towards thing:
Have the sphere of negative focal power or second lens element 2 of aspherical lens.
Have the sphere or the aspherical lens of positive focal power and be used to proofread and correct the 3rd lens element 3 of the curvature of field.
Be provided with aperture member 4 in second lens element, 2 back, and aperture member 4 is located between second lens element 2 and the 3rd lens element 3.
Engage the lens subassembly of forming with positive light coke by the 4th lens element 5 and the 5th lens element 6, the 4th lens element 5 that wherein has positive light coke is preceding, the 5th lens element 6 with negative power after.
Wherein 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, and EFL is the focal length value of said wide-angle high definition safety monitoring camera lens, 2.8 >=BFL/EFL then of the present invention >=2.3.
In addition, also include infrared fileter 7 and imaging surface 8.
Specifically, first lens element 1, it has negative focal power, is that the two sides all is the glass lens element of sphere.Second lens element 2, it has negative focal power, is that to have a face in the two sides at least be the lens element of aspheric surface.The 3rd lens element 3, it has positive focal power, is that to have a face in the two sides at least be the lens element of aspheric surface.The 4th lens element 4, it has positive focal power, is that the two sides all is the glass lens element of convex surface.The 5th lens element 5, it has negative focal power, is the spherical lens elements of a recessed convex surface.And the 4th lens element and the 5th passes through element and closes towards the face that connects as square side through convex surface and carry out the bonding joint lens combination of forming.
As the optimal way of present embodiment, described first lens element 1 satisfies the following conditions formula:
Nd >=1.68, Vd >=52, wherein Nd representes the d optical index of the first lens element material, and Vd representes the d light Abbe constant of the first lens element material, and d only wavelength is the visible light of 588nm.First lens element adopts refractive index Nd>=1.68; The high-refractivity and low-dispersion material of Abbe constant Vd>=52; Can effectively import the above light of field angle more than 120 ° and reduce the bore of first eyeglass, excessive to avoid volume, and the requirement of formula D*H/FOV≤0.26 that satisfies condition.
Optimal way as present embodiment; Described the 3rd lens element 3 satisfies following conditions formula: Nd >=1.85, Vd >=45, and wherein Nd representes the d optical index of the 3rd lens element material; Vd representes the d light Abbe constant of the 3rd lens element material, and d only wavelength is the visible light of 588nm.The 3rd lens element adopts refractive index Nd >=1.85, and the high chromatic dispersion material of the high index of refraction of Abbe constant Vd >=45 can be assembled preceding two light that the negative power lens are come fast, and the effective value of chromatism in the compensation optical system of high chromatic dispersion material.
In addition, the present invention also will meet this condition: TTL/EFL≤8.5, and wherein TTL is the distance of first lens unit object space side outermost point to the imaging surface of said camera lens, and EFL is the focal length value of said camera lens.
As the optimal way of present embodiment, described second lens element and the 5th lens element satisfy the following conditions formula:
3.5 >=F2/F5 >=2.8, wherein F2 representes the focal length value of second lens element, and F5 representes the focal length value of the 5th lens element.Because of when the F2/F5＞3.5, the focal power of second lens element is excessive, and the focal power of the 5th lens element is too small, thereby makes whole optical system can embody positive light coke, can cause the back burnt BFL of optical system to shorten.When F2/F5＜2.8, the focal power of second lens element is too small, and the focal power of the 5th lens element is excessive, thereby makes whole optical system can embody excessive negative power, can cause the back burnt BFL of optical system to shorten, and the excessive eyeglass of focal power is difficult to processing.
As the optimal way of present embodiment, described the 3rd lens element and the 4th lens element satisfy the following conditions formula:
-1.5 >=F2/F3 >=-2.2, wherein F2 representes the focal length value of second lens element, F3 representes the focal length value of the 3rd lens element.Because of when the F2/F3＞-1.5, the negative power of second lens is excessive, and the positive light coke of the 4th lens is too small, thereby makes whole optical system can embody excessive negative power, field angle is excessive bring differ the correction that can not improve; When F2/F3＜-2.2, the negative power of second lens is too small, and the positive light coke of the 3rd lens is excessive, thereby makes whole optical system can embody negative power, can cause the optical system field angle not enough.
The 3rd lens unit will have the thickness greater than 4mm, can reduce the curvature of field aberration of wide-angle lens, if lens unit is too thin, now the accumulation curvature of field of ten thousand curvature of field and system will be difficult to proofread and correct.When a system exists the curvature of field to be, can not obtain all image planes clearly of whole image planes, or clear or field of view edge is clear or the center, visual field is clear in the middle of the visual field, promptly the center is asynchronous with periphery.
As the optimal way of present embodiment, the first lens unit r1 face wants convex surface to object plane, is used for control system distortion size.Distortion is that object and picture lose similarity, and the control distortion is extremely important concerning the camera lens of big visual field.
FNO≤2.1 of the aperture member 4 of camera lens, FNO representes the value of aperture size.
As the optimal way of present embodiment, the maximum clear aperture of first lens element satisfies following condition formula with corresponding imaging image height, field angle:
D*H/FOV≤0.26, wherein FOV representes the maximum field of view angle of wide-angle safety monitoring camera lens, and D representes the maximum clear aperture of pairing first lens element of maximum FOV towards the object space convex surface, and H representes the pairing imaging image height of maximum FOV.
As the optimal way of present embodiment, said the 4th lens element adopts glue to carry out bonding the joint with the 5th lens element and forms a lens subassembly, and the convex surface on the composition surface of two lens elements is side towards picture side; And the 4th lens unit and the 5th lens unit composition surface satisfy following condition formula:
| R|＞Φ/2, wherein R is the curvature of centre radius on composition surface, Φ is the light effective aperture on composition surface.
As the optimal way of present embodiment, following condition formula: θ≤43 ° are satisfied on the 4th lens unit and the 5th lens unit composition surface, and wherein θ is the tangent line of any point on the composition surface and the angle of optical axis.
In a word, four eyeglasses of second lens unit to the, five lens units need reasonably to distribute focal power and be controlled at simultaneously in the above-mentioned condition formula scope, to reach temperature characterisitic requirement preferably.
First lens element of optical lens adopts glass mirror; Can effectively protect the in use scratch resistant scrape along opposing of optical lens rugged environment variable effect; The 4th lens element and the 5th lens element adopt bond layout, with effective aberration that improves optical system.The condition formula of θ≤43 ° is satisfied on the composition surface that control simultaneously engages lens subassembly; Generation with effective control senior aberration; Conciliate as ability thereby be beneficial to logical luminous energy power aperture FNO≤2.1 of improving whole optical system, and effectively reduce the processing and the gluing technique requirement on composition surface.
Another important feature of the present invention is burnt BFL after keeping still having long camera lens under the short condition of camera lens length overall TTL; The bigger dimensional requirement of imageing sensor periphery electronic devices and components when satisfying camera design; Simultaneously; Because the long distance that makes lens element and optical filter leave imageing sensor of BFL is farther, can effectively reduce surface cleanliness requirement, more easily the assembling production of camera to each lens element and optical filter.
Fig. 2 to Fig. 5 is the optical performance curve figure corresponding to case study on implementation, and wherein Fig. 2 is that the axial chromatic aberration curve map 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 the chromatic longitudiinal aberration curve, is represented by the wavelength of F commonly used, d, C three coloured light, and unit is micron um.Fig. 4 is 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. 5 is the 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 this case study on implementation, the whole focal length value of this optical lens is EFL, and f-number is FNO; 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; The diaphragm face is r5, and the minute surface of the 3rd lens element is r6, r7, and the minute surface of the 4th lens element is r8, r9; The minute surface of the 5th lens element is r9, r10, and the minute surface that passes through infrared fileter is r11, r12, and the formula of aspherical mirror is:
In the formula: Z is an aspheric surface along optical axis direction highly for the position of h the time, apart from the aspheric surface summit apart from rise sag
C=1/r, r represent the radius-of-curvature of minute surface, and k is circular cone coefficient conic, A, and B, C, D, E, F, H is the high order aspheric surface coefficient, and the e in the coefficient represents scientific notation, middle e-05 representes 10
-5
Preferred parameter value table one of the present invention
EFL=286mm，FNO=206，FOV=121°，TTL=225mm
The minute surface of beating " * " number in the last table is an aspheric surface, and its correlation parameter is following:
Preferred parameter value table two of the present invention
That following table is listed is aspheric surface coefficient k, A, B, C, D, E, F, G:
| k | A | B | C |
| -5.67E-02 | 2.90E-04 | -5.36E-05 | -7.65E-06 |
| -8.60E-03 | -4.15E-04 | -2.96E-04 | -2.16E-05 |
| -5.80E-02 | -2.84E-05 | 9.03E-05 | 8.19E-06 |
| -3.04E-01 | 1.26E-05 | 5.13E-04 | -3.18E-05 |
| D | E | F | G |
| -3.39E-07 | 1.43E-08 | 5.17E-10 | 1.01E-10 |
| -2.33E-06 | -3.95E-07 | 6.18E-09 | 9.64E-11 |
| -1.68E-06 | 3.74E-07 | -1.13E-08 | -1.39E-07 |
| -3.72E-05 | 3.64E-07 | -1.45E-08 | 3.63E-07 |
According to above-mentioned case study on implementation data, the numerical value that calculates condition formula involved in claims is following:
Claims (10)
1. wide-angle high resolving power safety monitoring camera lens begins to be provided with successively from the side towards thing:
First lens element (1) with negative focal power and protruding falcate to object space;
Have the sphere of negative focal power or second lens element (2) of aspherical lens;
Be provided with aperture member (4) in second lens element (2) back;
Have the sphere or the aspherical lens of positive focal power and be used to proofread and correct the 3rd lens element (3) of the curvature of field;
Engage the lens subassembly of forming with positive light coke by the 4th lens element (5) and the 5th lens element (6), the 4th lens element (5) that wherein has positive light coke is preceding, the 5th lens element (6) with negative power after;
It is characterized in that, 2.8 >=BFL/EFL >=2.3, wherein 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, EFL is the focal length value of said wide-angle high definition safety monitoring camera lens.
2. a kind of wide-angle high resolving power safety monitoring camera lens according to claim 1 is characterized in that described first lens element (1) satisfies the following conditions formula:
Nd >=1.68; Vd >=52, wherein Nd representes the d optical index of the first lens element material, Vd representes the d light Abbe constant of the first lens element material; D only wavelength is the visible light of 588nm, and first lens unit is the convex surface that is used for control system distortion size towards the one side of thing.
3. a kind of wide-angle high resolving power safety monitoring camera lens according to claim 1 and 2 is characterized in that described the 3rd lens element (3) satisfies the following conditions formula:
Nd >=1.85, Vd >=45, wherein Nd representes the d optical index of the 3rd lens element material, and Vd representes the d light Abbe constant of the 3rd lens element material, and d only wavelength is the visible light of 588nm, and the thickness of the 3rd lens unit (3) is greater than 4mm.
4. a kind of wide-angle high resolving power safety monitoring camera lens according to claim 1 and 2 is characterized in that TTL/EFL≤8.5, and wherein TTL is the distance of first lens unit object space side outermost point to the imaging surface of said camera lens, and EFL is the focal length value of said camera lens.
5. a kind of wide-angle high resolving power safety monitoring camera lens according to claim 1 and 2 is characterized in that described second lens element and the 5th lens element satisfy the following conditions formula:
3.5 >=F2/F5 >=2.8, wherein F2 representes the focal length value of second lens element, and F5 representes the focal length value of the 5th lens element.
6. a kind of wide-angle high resolving power safety monitoring camera lens according to claim 1 and 2 is characterized in that described the 3rd lens element and the 4th lens element satisfy the following conditions formula:
-1.5 >=F2/F3 >=-2.2, wherein F2 representes the focal length value of second lens element, F3 representes the focal length value of the 3rd lens element.
7. a kind of wide-angle high resolving power safety monitoring camera lens according to claim 1 and 2 is characterized in that FNO≤2.1 of the aperture member (4) of camera lens, and FNO representes the value of aperture size.
8. a kind of wide-angle high resolving power safety monitoring camera lens according to claim 1 and 2 is characterized in that the maximum clear aperture of first lens element and corresponding imaging image height, field angle satisfy following condition formula:
D*H/FOV≤0.26, wherein FOV representes the maximum field of view angle of wide-angle safety monitoring camera lens, and D representes the maximum clear aperture of pairing first lens element of maximum FOV towards the object space convex surface, and H representes the pairing imaging image height of maximum FOV.
9. a kind of wide-angle high resolving power safety monitoring camera lens according to claim 1 and 2; It is characterized in that said the 4th lens element and the 5th lens element adopt glue to carry out bonding the joint and form a lens subassembly, the convex surface on the composition surface of two lens elements is side towards picture side; And the 4th lens unit and the 5th lens unit composition surface satisfy following condition formula:
| R|＞Φ/2, wherein R is the curvature of centre radius on composition surface, Φ is the light effective aperture on composition surface.
10. a kind of wide-angle high resolving power safety monitoring camera lens according to claim 3; It is characterized in that the 4th lens unit and the 5th lens unit composition surface satisfy following condition formula: θ≤43 °, wherein θ is the tangent line of any point on the composition surface and the angle of optical axis.
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| CN2011203861555U CN202433591U (en) | 2011-10-12 | 2011-10-12 | Wide-angle high-resolution security monitoring lens |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011203861555U CN202433591U (en) | 2011-10-12 | 2011-10-12 | Wide-angle high-resolution security monitoring lens |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102360114A (en) * | 2011-10-12 | 2012-02-22 | 舜宇光学(中山)有限公司 | Monitoring lens |
| CN103543517A (en) * | 2013-11-11 | 2014-01-29 | 厦门爱劳德光电有限公司 | Wide-angle and high-resolution small optics lens |
-
2011
- 2011-10-12 CN CN2011203861555U patent/CN202433591U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102360114A (en) * | 2011-10-12 | 2012-02-22 | 舜宇光学(中山)有限公司 | Monitoring lens |
| CN102360114B (en) * | 2011-10-12 | 2013-11-20 | 舜宇光学(中山)有限公司 | Monitoring lens |
| CN103543517A (en) * | 2013-11-11 | 2014-01-29 | 厦门爱劳德光电有限公司 | Wide-angle and high-resolution small optics lens |
| CN103543517B (en) * | 2013-11-11 | 2016-04-20 | 厦门爱劳德光电有限公司 | The optics tiny lens of wide-angle high-resolution |
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Granted publication date: 20120912 |