CN202230237U - Bugeye lens - Google Patents
Bugeye lens Download PDFInfo
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- CN202230237U CN202230237U CN2011203065851U CN201120306585U CN202230237U CN 202230237 U CN202230237 U CN 202230237U CN 2011203065851 U CN2011203065851 U CN 2011203065851U CN 201120306585 U CN201120306585 U CN 201120306585U CN 202230237 U CN202230237 U CN 202230237U
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Abstract
The utility model discloses a bugeye lens which comprises a first lens with negative focal power, a second lens with negative focal power, a third lens with positive focal power, a forth lens with negative focal power and a fifth lens with positive focal power from an object to an image sequentially, wherein the forth lens and the fifth lens are bonded to form a bonding lens with positive focal power; in addition, the fact that the ratio between BFL (back focal length) and EFL (effective focal lens) is greater than or equal to 2.4 can be realized, wherein the BFL refers to the distance from the outermost point at the image side of the fifth lens element of the bugeye lens to the imaging surface, and the EFL refers to the focal length value of the bugeye lens. In the bugeye lens, although TFL (total focal length) is shorter, the BFL is longer, so as to meet the requirement that the size of peripheral electronic components of an image sensor is larger in camera design; and the BFL is longer, so that the distance from the lens elements and an optical filter to the image sensor, therefore, the requirement on surface cleanliness of the lens elements and the optical filter can be effectively reduced, and the assembly manufacturing of a camera is easier.
Description
Technical field
The utility model relates to a kind of novel bugeye lens, especially is fit to be applied to the camera lens operating distance is had relatively high expectations and the monitoring camera and the installed video system of the serviceability temperature condition of broad are arranged.
Background technology
Bugeye lens is general at present adopts 5 to 8 eyeglasses to form; It like Chinese patent number is 200910099703 bugeye lens; Just adopt 4 sheet glass and 2 glass lens to form; But this bugeye lens size is bigger, and price is higher, can not satisfy customer requirement small size, low price and high performance requirement.For this reason, also there is the bugeye lens of Japanese enterprises exploitation to adopt the aspheric surface technology, with weight reduction, cost with reduce deflection; It like Chinese patent number is 200880106079 bugeye lens; Just adopt 1 sheet glass eyeglass and 4 glass lens to form, 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-40 ℃ to+85 ℃ temperature range, to keep perfectly imaging definition.
The utility model content
The utility model technical matters to be solved is to overcome above-mentioned technological deficiency, provides that a kind of cost is low, in light weight, size is little, the bugeye lens of high-resolution and long operating distance and wide operating temperature range.
Said bugeye lens includes from object space to picture side successively: first lens and second lens with negative power; The 3rd lens with positive light coke; The 4th lens and the 5th lens with negative power with positive light coke; Said the 4th lens and the 5th lens gummed and form and have the balsaming lens of positive light coke, and satisfy BFL/EFL >=2.4, wherein BFL is the distance of the 5th lens element picture side side outermost point to imaging surface of said bugeye lens; The BFL of indication is airborne distance here, and EFL is the focal length value of said ultra bugeye lens.
Also be provided with diaphragm between the 3rd lens element and the balsaming lens, be provided with color filter behind the balsaming lens.And except that first lens element, have at least 3 pieces to be the plastic aspherical element eyeglass in all the other 4 pieces of lens elements.Through configuration like this, eyeglass quantity that just can enough minimums reaches total field angle of gratifying optical characteristics and broad.
Said first lens are the curved month type eyeglass, and convex surface is towards object space, and second lens are aspherical lens, and the 3rd lens are the biconvex eyeglass, and said the 4th lens and the 5th lens are aspherical lens.
Further, said first lens satisfy: Nd >=1.65, and Vd >=45, wherein Nd representes the d optical index of lens material, Vd representes the d light Abbe constant of lens material.First lens are through adopting refractive index Nd>=1.65; The high-refractivity and low-dispersion material of Abbe constant Vd>=45; Can effectively import the above light of 150 ° of field angle and reduce the bore of first eyeglass, excessive to avoid volume, and the requirement of formula D*H/FOV≤0.205 that satisfies condition.
Further, described the 3rd lens and the 4th lens satisfy: Nd>=1.55, Vd≤30.
The 3rd lens are through adopting refractive index Nd>=1.55, and the high chromatic dispersion material of the high index of refraction of Abbe constant Vd≤30 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, said camera lens also satisfies: TTL/EFL≤16, and wherein TTL is the distance of said camera lens first lens object space side outermost point to the imaging surface, EFL is the focal length value of said camera lens.
Further, described second lens and the 5th lens satisfy :-0.95 >=F2/F5 >=-1.5, and wherein F2 representes the focal length value of second lens element, F5 representes the focal length value of the 5th lens element.Because of when the F2/F5＞-0.95, the negative power of second lens is excessive, and the positive light coke of the 5th lens is too small; Thereby make whole optical system can embody negative power; (promptly under hot conditions, the back burnt BFL of camera lens can shorten, under cryogenic conditions can to cause the effect of back burnt BFL " pyrocondensation cold expanding " of optical system; The back burnt BFL of camera lens can be elongated, do not meet the condition that camera uses); When F2/F5＜-1.5; The negative power of second lens is too small; The positive light coke of the 5th lens is excessive; Thereby make whole optical system can embody excessive positive light coke, the effect that can cause the back burnt BFL of optical system " to expand with heat and contract with cold " is too obvious, thereby influences camera imaging definition in-40 ℃ to+85 ℃ temperature range.
Further, described the 3rd lens and the 4th lens satisfy :-0.95 >=F3/F4 >=-2.0, and wherein F3 representes the focal length value of the 3rd lens element, F4 representes the focal length value of the 4th lens element.As a same reason, when F3/F4＞-0.95, the positive light coke of the 3rd lens is excessive; The negative power of the 4th lens is too small, thereby makes whole optical system can embody excessive positive light coke, can cause effect that the back burnt BFL of optical system " expands with heat and contract with cold " too obviously (promptly under hot conditions; It is long that the back burnt BFL of camera lens can become; Under cryogenic conditions, it is too short that the back burnt BFL of camera lens can become, and do not meet the condition that camera uses); When F 3/F4＜-2.0; The positive light coke of the 3rd lens is too small; The negative power of the 4th lens is excessive; Thereby make whole optical system can embody negative power, can cause the effect of the back burnt BFL " pyrocondensation cold expanding " of optical system, thereby influence camera imaging definition in-40 ℃ to+85 ℃ temperature range.
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.Simultaneously, in order further to improve the temperature characterisitic effect, also can change the material of the 3rd lens element into glass material (because of the temperature characterisitic of glass material is better than plastic resin material) by plastic resin.
In addition, the diaphragm of said camera lens satisfies: FNO≤2.2.
Further; The maximum clear aperture of said first lens satisfies formula with corresponding imaging image height, field angle: D*H/FOV≤0.205; Wherein FOV representes the maximum field of view angle of bugeye lens; 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.
In addition, satisfy on the composition surface of said balsaming lens: θ≤44 °, wherein θ is the tangent line of any point on the composition surface and the angle of optical axis.
Further, satisfy on the 4th lens unit and the 5th lens unit composition surface: | R|＞Φ/2, wherein R is the curvature of centre radius on composition surface, Φ is the light effective aperture on composition surface.
First lens element of said 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≤44 ° 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 the logical luminous energy power (diaphragm FNO≤2.2) that improves whole optical system, and effectively reduce the processing and the gluing technique requirement on composition surface.
The utility model has kept still having than burnt BFL behind the 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.
Description of drawings
Through the description of its exemplary embodiment being carried out below in conjunction with accompanying drawing, the above-mentioned feature and advantage of the utility model will become apparent and understand easily.
The structural representation of the bugeye lens specific embodiment that Fig. 1 relates to for the utility model;
Fig. 2 is the axial chromatic aberration curve map of the utility model embodiment;
Fig. 3 is the chromatic longitudiinal aberration curve map of the utility model embodiment;
Fig. 4 is the astigmatism curve map of the utility model embodiment;
Fig. 5 is the distortion curve figure of the utility model embodiment;
Fig. 6 is the MTF curve map of the utility model embodiment.
Embodiment
Below in conjunction with accompanying drawing the utility model is described in further detail.
The case study on implementation of the bugeye lens that the utility model relates to is as shown in Figure 1, and said camera lens is applied to visual angle >=190 ° in-vehicle camera system approximately especially.This bugeye lens extremely is followed successively by joint lens combination, color filter GF, the imaging surface IMA that the first lens element L1, the second lens element L2, the 3rd lens element L3, diaphragm r7, the 4th lens element L4 and the 5th lens element L5 form as side by the thing side.
The first lens L1 has negative focal power, is that the two sides all is the glass lens element of sphere; The second lens element L2 has negative focal power, is that the two sides all is the plastic lens elements of aspheric surface; The 3rd lens element L 3 has positive focal power, is that the two sides all is the aspherical plastic lens element of convex surface; The 4th lens element L4 has negative focal power, is that the two sides all is the plastic lens elements of aspheric surface; The 5th lens element L5 has positive focal power, is that the two sides all is the aspherical plastic lens element of convex surface.And the 4th lens element and the 5th passes through element and closes towards the face that connects of object space side through convex surface and carry out the bonding balsaming lens group that forms.
Fig. 2 to Fig. 6 is the optical performance curve figure corresponding to case study on implementation; Wherein Fig. 2 is axial chromatic aberration curve map (also can be the spherical aberration curve map), by F, d, C (F=0.486um, d=0.588um commonly used; C=0.656um) wavelength of three coloured light is represented, 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 the astigmatism curve map, representes that by the wavelength of F commonly used, d, C three coloured light unit is mm.Fig. 5 is distortion curve figure, representes the distortion sizes values under the different field angle situation, and unit is %.Fig. 6 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 stop value 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 the first eyeglass L1 is r1, r2; The minute surface of the second eyeglass L2 is r3, r4, and the minute surface of prismatic glasses L3 is r5, r6, and the diaphragm face is r7; The minute surface of the 4th eyeglass L4 is r8, r9, and the minute surface of color filter GF is r10, r11, 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 is the high order aspheric surface coefficient, and the e in the coefficient represents scientific notation, middle e-05 representes 10
-5
EFL＝0.844mm，FNO＝2.0，FOV＝190°，TTL＝12.76mm
| The face sequence number | Radius-of-curvature r | Center thickness d | Refractive index Nd | Abbe constant Vd | Effective aperture D |
| 1 | 11.95 | 0.7 | 1.729 | 54.7 | 10.42 |
| 2 | 2.765 | 2.19 | 5.34 | ||
| *3 | 8.189 | 0.9 | 1.512 | 56.3 | 5.34 |
| *4 | 0.933 | 0.954 | 4.0 | ||
| *5 | 3.652 | 2.2 | 1.585 | 29.9 | 4.0 |
| *6 | -2.893 | 1.076 | 3.7 | ||
| 7 | infinity | 0.014 | 1.26 | ||
| *8 | 6.072 | 0.7 | 1.585 | 29.9 | 1.32 |
| *9 | 1.268 | 1.74 | 1.512 | 56.3 | 1.94 |
| *10 | -1.363 | 0.1 | 2.5 | ||
| 11 | infinity | 0.3 | 1.5168 | 64.16 | 2.8 |
| IMA | infinity | 1.89 | 3.6 |
The minute surface of beating " * " number in the last table is an aspheric surface, and its correlation parameter is following:
That following table is listed is aspheric surface COEFFICIENT K, A, B, C, D, E:
| The face sequence number | k | A | B | C | D | E |
| 3 | -18.49611 | -0.0096357715 | -0.00033303945 | 9.6685811e-006 | 4.841145e-006 | 3.2386081e-008 |
| 4 | -1.576424 | 0.0072494689 | -0.0017340698 | -0.00045317386 | -1.6616007e-005 | -1.021014e-006 |
| 5 | -16.07551 | 0.017655672 | 0.0023182228 | -0.00024144254 | -0.00023162164 | 2.8526841e-007 |
| 6 | -3.813011 | 0.0029564247 | -0.00019058289 | -0.00066472842 | 7.9139172e-005 | 1.6394898e-006 |
| 8 | -168.1374 | 0.096487473 | -0.093630036 | -0.085993001 | 0.17514807 | -0.0024354399 |
| 9 | -4.411174 | 0.52700866 | -0.61722387 | 0.34831489 | -0.087779889 | -0.0047905016 |
| 10 | -1.008281 | 0.023156556 | -0.0082477298 | -8.5945757e-005 | 0.0025430394 | 5.5428398e-005 |
According to above-mentioned case study on implementation data, the numerical value that calculates condition formula involved in claims is following:
Though described the principle and the embodiment of the utility model above to bugeye lens; But under the above-mentioned instruction of the utility model; Those skilled in the art can carry out various improvement and distortion on the basis of the foregoing description, and these improve or distortion all drops in the protection domain of the utility model.It will be understood by those skilled in the art that top specific descriptions just in order to explain the purpose of the utility model, and be not to be used to limit the utility model that the protection domain of the utility model is limited claim and equivalent thereof.
Claims (10)
1. bugeye lens; It is characterized in that; Include successively from object space to picture side: first lens and second lens with negative power; The 3rd lens with positive light coke, the 4th lens with negative power and the 5th lens, said the 4th lens and the 5th lens gummed and form balsaming lens with positive light coke with positive light coke;
And, also satisfy:
BFL/EFL≥2.4
Wherein BFL is the distance of the 5th lens element picture side side outermost point to imaging surface of said bugeye lens, and the BFL of indication is airborne distance here, and EFL is the focal length value of said ultra bugeye lens.
2. bugeye lens according to claim 1; It is characterized in that: said first lens are the curved month type eyeglass, and convex surface is towards object space, and second lens are aspherical lens; The 3rd lens are the biconvex eyeglass, and said the 4th lens and the 5th lens are aspherical lens.
3. bugeye lens according to claim 1 is characterized in that: said first lens satisfy:
Nd≥1.65，Vd≥45
Wherein Nd representes the d optical index of lens material, and Vd representes the d light Abbe constant of lens material.
4. bugeye lens according to claim 1 is characterized in that: said the 3rd lens and the 4th lens satisfy:
Nd≥1.55，Vd≤30。
5. bugeye lens according to claim 1 is characterized in that: said camera lens also satisfies:
TTL/EFL≤16
Wherein TTL is the distance of said camera lens first lens object space side outermost point to the imaging surface, and EFL is the focal length value of said camera lens.
6. bugeye lens according to claim 1 is characterized in that: said second lens and the 5th lens satisfy:
-0.95≥F2/F5≥-1.5
Wherein F2 representes the focal length value of second lens, and F5 representes the focal length value of the 5th lens.
7. bugeye lens according to claim 1 is characterized in that: described the 3rd lens and the 4th lens satisfy:
-0.95≥F3/F4≥-2.0
Wherein F3 representes the focal length value of the 3rd lens, and F4 representes the focal length value of the 4th lens.
8. bugeye lens according to claim 1 is characterized in that: the diaphragm of said camera lens satisfies FNO≤2.2.
9. bugeye lens according to claim 1 is characterized in that: the maximum clear aperture of said first lens satisfies following formula with corresponding imaging image height, field angle:
D*H/FOV≤0.205
Wherein FOV representes the maximum field of view angle of bugeye 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.
10. bugeye lens according to claim 1 is characterized in that: satisfy on the composition surface of said balsaming lens:
θ≤44°
Wherein θ is the tangent line of any point on the composition surface and the angle of optical axis.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203065851U CN202230237U (en) | 2011-08-22 | 2011-08-22 | Bugeye lens |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203065851U CN202230237U (en) | 2011-08-22 | 2011-08-22 | Bugeye lens |
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| CN202230237U true CN202230237U (en) | 2012-05-23 |
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| CN2011203065851U Expired - Lifetime CN202230237U (en) | 2011-08-22 | 2011-08-22 | Bugeye lens |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102289052A (en) * | 2011-08-22 | 2011-12-21 | 宁波舜宇车载光学技术有限公司 | Ultra wide angle camera lens |
| CN103984079A (en) * | 2013-02-08 | 2014-08-13 | 大立光电股份有限公司 | Wide-view-angle camera lens group |
| JP5607223B1 (en) * | 2013-08-29 | 2014-10-15 | サーテック インターナショナル （スツォウ） カンパニー リミテッド | Wide angle lens |
| CN105278082A (en) * | 2015-11-19 | 2016-01-27 | 中山联合光电科技股份有限公司 | Ultra-wide-angle fisheye optical imaging lens |
| US9632292B2 (en) | 2012-03-29 | 2017-04-25 | Hitachi Maxell, Ltd. | Imaging lens and imaging device |
| CN107179599A (en) * | 2017-07-26 | 2017-09-19 | 浙江舜宇光学有限公司 | Optical imaging system |
| WO2019019669A1 (en) * | 2017-07-26 | 2019-01-31 | 浙江舜宇光学有限公司 | Optical imaging system |
| CN109975960A (en) * | 2019-04-25 | 2019-07-05 | 协益电子（苏州）有限公司 | One kind looking around wide-angle without thermalization camera lens and automobile panoramic round-looking system |
| WO2021134801A1 (en) * | 2020-01-03 | 2021-07-08 | 天津欧菲光电有限公司 | Optical system, lens module, and terminal device |
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2011
- 2011-08-22 CN CN2011203065851U patent/CN202230237U/en not_active Expired - Lifetime
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2013026369A1 (en) * | 2011-08-22 | 2013-02-28 | 宁波舜宇车载光学技术有限公司 | Ultra wide-angle lens |
| CN102289052B (en) * | 2011-08-22 | 2013-12-04 | 宁波舜宇车载光学技术有限公司 | Ultra wide angle camera lens |
| CN102289052A (en) * | 2011-08-22 | 2011-12-21 | 宁波舜宇车载光学技术有限公司 | Ultra wide angle camera lens |
| US10795121B2 (en) | 2012-03-29 | 2020-10-06 | Maxell, Ltd. | Imaging lens and imaging device |
| US9632292B2 (en) | 2012-03-29 | 2017-04-25 | Hitachi Maxell, Ltd. | Imaging lens and imaging device |
| US10018812B2 (en) | 2012-03-29 | 2018-07-10 | Maxell, Ltd. | Imaging lens and imaging device |
| US10168508B2 (en) | 2012-03-29 | 2019-01-01 | Maxell, Ltd. | Imaging lens and imaging device |
| CN103984079A (en) * | 2013-02-08 | 2014-08-13 | 大立光电股份有限公司 | Wide-view-angle camera lens group |
| CN103984079B (en) * | 2013-02-08 | 2015-11-18 | 大立光电股份有限公司 | Wide-view-angle camera lens group |
| JP5607223B1 (en) * | 2013-08-29 | 2014-10-15 | サーテック インターナショナル （スツォウ） カンパニー リミテッド | Wide angle lens |
| CN105278082A (en) * | 2015-11-19 | 2016-01-27 | 中山联合光电科技股份有限公司 | Ultra-wide-angle fisheye optical imaging lens |
| CN107179599A (en) * | 2017-07-26 | 2017-09-19 | 浙江舜宇光学有限公司 | Optical imaging system |
| CN107179599B (en) * | 2017-07-26 | 2019-10-11 | 浙江舜宇光学有限公司 | Optical imaging system |
| WO2019019669A1 (en) * | 2017-07-26 | 2019-01-31 | 浙江舜宇光学有限公司 | Optical imaging system |
| CN109975960A (en) * | 2019-04-25 | 2019-07-05 | 协益电子（苏州）有限公司 | One kind looking around wide-angle without thermalization camera lens and automobile panoramic round-looking system |
| WO2021134801A1 (en) * | 2020-01-03 | 2021-07-08 | 天津欧菲光电有限公司 | Optical system, lens module, and terminal device |
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Granted publication date: 20120523 Effective date of abandoning: 20131204 |
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