CN101943789A - Large-aperture monitoring lens - Google Patents
Large-aperture monitoring lens Download PDFInfo
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- CN101943789A CN101943789A CN200910040992XA CN200910040992A CN101943789A CN 101943789 A CN101943789 A CN 101943789A CN 200910040992X A CN200910040992X A CN 200910040992XA CN 200910040992 A CN200910040992 A CN 200910040992A CN 101943789 A CN101943789 A CN 101943789A
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 21
- 229920003023 plastic Polymers 0.000 claims abstract description 10
- 239000004033 plastic Substances 0.000 claims abstract description 10
- 230000003287 optical effect Effects 0.000 claims abstract description 5
- 239000011521 glass Substances 0.000 abstract description 12
- 230000004075 alteration Effects 0.000 abstract description 11
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- 230000000295 complement effect Effects 0.000 abstract description 5
- 238000003384 imaging method Methods 0.000 abstract description 5
- 230000004907 flux Effects 0.000 abstract 1
- 230000008859 change Effects 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 3
- 230000001276 controlling effect Effects 0.000 description 2
- 238000012942 design verification Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
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Abstract
The invention discloses a large-aperture monitoring lens, which comprises a first lens group with a negative focal length, an automatic aperture and a second lens group with a positive focal length from an object side along an optical axis; the second lens group comprises at least three lens sheets, wherein the first lens sheet and the last lens sheet are both plastic aspheric lens, the first lens sheet has positive focal length, and the last lens sheet has negative focal length; the following conditions are satisfied between the focal lengths of the first lens sheet and the last lens sheet: 2.0 < | fa/fb | < 4.0, where fa is the focal length of the first lens sheet and fb is the focal length of the last lens sheet. The invention adopts two complementary aspheric lenses, ensures that the imaging quality is not influenced under the condition of large light flux, and obtains good correction effect on aberration. Meanwhile, glass is replaced by plastic, so that the weight and the total length of the whole system can be reduced, and the cost is effectively reduced.
Description
(1) technical field:
The present invention relates to a kind of change times camera lens that is applied to monitor Image intake device.
(2) background technology:
Economic advancing by leaps and bounds makes supervisory system be widely used in a plurality of industries.And along with major project engineering expansion in China such as " national Emergency System ", " safe city ", " safety construction ", " science and technology are alert by force ", use also more and more frequent the night of supervisory system.How correctly selects for use camera lens extremely important,, thereby also directly have influence on the effect of monitoring because camera lens has determined pickup quality according to being monitored on-the-spot environment.The at present domestic camera lens that is applied to supervisory system adopts full glass sphere lens combination to become mostly, and f-number FNo. is 1.4 or 1.2, and this camera lens can obtain photographic effect preferably when light is better in the daytime; But because extraneous brightness is low, there is certain limitation in identification when night or details in a play not acted out on stage, but told through dialogues are distinguished.If adopt the large aperture value, the aberration of this camera lens is obvious, sharpness is not enough, and volume is very big.Some external producers once attempted adding the glass aspherical lens, but the production precision height of glass aspherical lens, and the production cost height makes the costing an arm and a leg of whole camera lens, and the high-end monitoring camera lens of this costliness allows domestic a lot of users hang back.And owing to reasons such as technology, domestic eyeglass manufacturer is difficult to produce the high glass aspherical lens of precision, and this class glass aspheric lenses relies on import more, and most of share is occupied by external camera lens producer so determine in the market of high-end monitoring camera lens.Therefore, the imaging effect difference that designs and produce a large aperture, daytime and night is little, the lower monitoring camera lens of while price, and the vacancy that remedies domestic this series products has become the task of top priority.
(3) summary of the invention:
In order to overcome the deficiencies in the prior art, it is big to the invention provides a kind of logical light quantity, and imaging effect is good, the monitoring camera lens that price is low.
The present invention realizes by following technical scheme: a kind of large aperture monitoring camera lens comprises first lens combination, auto iris with negative focal length and second lens combination with positive focal length along optical axis from object space; Second lens combination comprises at least three lens, and wherein first lens and last a slice lens are the plastic aspherical element lens, and first lens has positive focal length, and last a slice lens has negative focal length; Meet the following conditions between the focal length of first lens and last a slice lens:
2.0＜|fa/fb|＜4.0；
Wherein fa is the focal length of first lens of second lens combination, and fb is the focal length of last a slice lens of second lens combination.
The present invention compared with prior art, following advantage is arranged: camera lens has adopted the aspherical lens of two complementary types, carry out the effect of environmental problem compensating for variations between positive and negative eyeglass, prevent that external environment from causing the instability of internal system, guarantee under the situation of big logical light quantity, the imaging picture element is not affected, and aberration obtains good calibration result.Adopt plastics to replace glass simultaneously, can reduce weight and mechanism's length overall of total system, effectively reduce cost.Physics and chemical characteristic because of glass lens itself, refractive index has than significant change with variation of ambient temperature, and the focal distance ratio through between design verification two complementary type glass lens could effectively prevent the variation that the temperature difference causes at least greater than 2, less than the effective aberration correction of 4 ability, reach the original design requirement.
The f-number FNo. of above-mentioned described auto iris satisfies condition: FNo.≤1.2.
For controlling cost, the first lens Qa of the above-mentioned second lens combination L2 and the refractive index N of last a slice lens Qb all satisfy condition: 1.52＜N＜1.6 under the prerequisite that guarantees image quality.
In order to guarantee that wide visual angle reaches the lightness that becomes multiple proportions and superelevation accurately, two lens combination must guarantee rational focal power distribution.The focal distance f of the above-mentioned described first lens combination L1
L1Focal distance f with the second lens combination L2
L2Between meet the following conditions: 0.7＜| f
L1/ f
L2|＜0.9.
Above-mentioned described camera lens also satisfies condition:
Wherein, f
wBe camera lens focal length when the wide-angle position, f
tBe camera lens focal length when taking the photograph distant positions.Above-mentioned term restriction the change multiple proportions of camera lens.
Above-mentioned described first lens combination comprises first negative lens, second negative lens, the 3rd positive lens and the 4th negative lens, and wherein the 3rd lens and the 4th lens are bonding.Described first negative lens is convex surface, is concave surface towards image planes that towards object plane second negative lens is a biconcave lens, and the 3rd positive lens is convex surface, is concave surface towards image planes towards object plane, and the 4th negative lens is convex surface, is concave surface towards image planes towards object plane.
Above-mentioned described second lens combination comprises the 5th positive lens, the 6th positive lens, the 7th negative lens, the 8th positive lens and the 9th negative lens; The 5th positive lens and the 9th negative lens are the plastic aspherical element lens, have positive focal length after the 7th negative lens and the 8th positive lens are bonding.Described the 5th positive lens is convex surface, is concave surface towards image planes that towards object plane the 6th positive lens is a biconvex lens, and the 7th negative lens is convex surface, is concave surface towards image planes that towards object plane the 8th positive lens is a biconvex lens, and the 9th negative lens is a biconcave lens.
The f-number FNo.=1.0 of above-mentioned described auto iris (ST).
(4) description of drawings:
Below in conjunction with accompanying drawing the present invention is done detailed explanation:
Figure 1A is the structural representation of the present invention when wide-angle position;
Figure 1B is the structural representation of the present invention when taking the photograph distant positions;
Fig. 2 A is the spherical aberration figure of the present invention when wide-angle position;
Fig. 2 B is the spherical aberration figure of the present invention when taking the photograph distant positions;
Fig. 3 A is the curvature of field figure of the present invention when wide-angle position;
Fig. 3 B is the curvature of field figure of the present invention when taking the photograph distant positions;
Fig. 4 A is the distortion figure of the present invention when wide-angle position;
Fig. 4 B is the distortion figure of the present invention when taking the photograph distant positions.
(5) embodiment:
The present invention is mainly used in the monitoring Image intake device, and the monitoring camera lens images in object on the image sensing component, and described image sensing component can be charge-coupled image sensor (Charge Coupled Device is called for short CCD).
The present invention comprises the first lens combination L1, auto iris ST with negative focal length and the second lens combination L2 with positive focal length along optical axis from object space, auto iris ST stationkeeping is constant, and camera lens is by changing between the first lens combination L1 and the second lens combination L2 apart from regulating the change multiple proportions; The second lens combination L2 comprises at least three lens, and wherein first lens Qa and last a slice lens Qb are the plastic aspherical element lens, and first lens Qa has positive focal length, and last a slice lens Qb has negative focal length; Meet the following conditions between the focal length of first lens Qa and last a slice lens Qb:
2.0＜|fa/fb|＜4.0；
Wherein: fa is the focal length of first lens Qa of the second lens combination L2,
Fb is the focal length of last a slice lens Qb of the second lens combination L2.
The f-number FNo. of above-mentioned described auto iris ST satisfies condition: FNo.≤1.2.
The present invention has adopted the aspherical lens Qa and the Qb of two complementary types, carry out the effect of environmental problem compensating for variations between positive and negative eyeglass, prevent that external environment from causing the instability of internal system, guarantee under the situation of big logical light quantity, the picture element of lens imaging is not affected, and aberration obtains good calibration result.Adopt plastics to replace glass simultaneously, can reduce weight and mechanism's length overall of total system, effectively reduce cost.Because of the physics and the chemical characteristic of glass lens itself, refractive index has than significant change with variation of ambient temperature.Focal distance ratio through between design verification two complementary type glass lens could effectively prevent the variation that the temperature difference causes at least greater than 2, less than the effective aberration correction of 4 ability, reaches the original design requirement.
For controlling cost, the first lens Qa of the described second lens combination L2 and the refractive index N of last a slice lens Qb all satisfy condition: 1.52＜N＜1.6 under the prerequisite that guarantees image quality.
The focal distance f of the described first lens combination L1
L1Focal distance f with the second lens combination L2
L2Between meet the following conditions: 0.7＜| f
L1/ f
L2|＜0.9.
Above-mentioned described camera lens also satisfies condition:
Wherein, f
wBe camera lens focal length when the wide-angle position, f
tBe camera lens focal length when taking the photograph distant positions.Above-mentioned term restriction the change multiple proportions of camera lens.
Particularly, the first lens combination L1 of the present invention comprises the first negative lens Q1, the second negative lens Q2, the 3rd positive lens Q3 and the 4th negative lens Q4.The described first negative lens Q1 is convex surface, is concave surface towards image planes towards object plane, the second negative lens Q2 is a biconcave lens, the 3rd positive lens Q 3 is convex surface, is concave surface towards image planes towards object plane, and the 4th negative lens Q4 is convex surface, is concave surface towards image planes towards object plane; The 3rd lens Q3 and the 4th lens Q4 are bonding.
The above-mentioned described second lens combination L2 comprises the 5th positive lens Q5, the 6th positive lens Q6, the 7th negative lens Q7, the 8th positive lens Q8 and the 9th negative lens Q9; The 5th positive lens Q5 and the 9th negative lens Q9 are the plastic aspherical element lens, have positive focal length after the 7th negative lens Q7 and the 8th positive lens Q8 are bonding.The 5th positive lens Q5 is convex surface, is concave surface towards image planes that towards object plane the 6th positive lens Q6 is a biconvex lens, and the 7th negative lens Q7 is convex surface, is concave surface towards image planes that towards object plane the 8th positive lens Q8 is a biconvex lens, and the 9th negative lens Q9 is a biconcave lens.
Shown in Figure 1A, Figure 1B, below be preferred parameter value of the present invention.
Table one
The aspherical shape of the 5th positive lens Q5 and the 9th negative lens Q9 satisfies following equation:
In formula, parameter c is the pairing curvature of radius, and y is radial coordinate (its unit is identical with length of lens unit), and k is the circular cone whose conic coefficient.When k-factor face deltoid less than-1 time is a hyperbolic curve, equaling at-1 o'clock is para-curve, between-1 being oval between 0 the time, equals at 0 o'clock for circular, be oblateness greater than 0 o'clock.α 1 to α 8 represents the pairing coefficient of each radial coordinate respectively, can accurately set the face molded dimension of lens front and back both-sided aspherical by above parameter.
In embodiments of the present invention, the f-number FNo. of auto iris ST is 1.0.
In the present embodiment, the aspheric surface correlation values of surperficial S16, the S17 of surperficial S9, the S10 of the 5th positive lens Q5 and the 9th negative lens Q9 is listed in the table below successively:
Table 2
| S9 | S10 | S16 | S17 | |
| K | 0.352408466 | 56.506125639 | -30.750474620 | 53.226615077 |
| E4 | 0.000082210 | 0.000286622 | 0.000656948 | 0.002516238 |
| E6 | 0.352408466 | 0.000002668 | -0.000017756 | -0.000094763 |
| E8 | -0.000000029 | -0.000000014 | 0.000000022 | -0.000094763 |
| E10 | -0.000000001 | -0.000000002 | 0.000000010 | -0.000000065 |
Can be calculated by table 1, in embodiments of the present invention, the focal distance f a of first lens Qa of the second lens combination L2 i.e. the focal distance f of the 5th positive lens Q5
5=40.64mm; The focal distance f b of last a slice lens Qb of the second lens combination L2 i.e. the focal distance f of the 9th negative lens Q9
9=-19.42mm;
|f
5/f
9|＝2.09。
The focal distance f of the first lens combination L1
L1The focal distance f of=-8.87mm, the second lens combination L2
L2=10.58mm;
|f
L1/f
L2|＝0.84。
Horizontal field of view angle 2 ω of present embodiment=95 °.This kind focal power cooperates can enlarge the efficiency-timed fruit of change, and it is poor to obtain outstanding optics receipts.
First lens Qa of the second lens combination L2 i.e. the refractive index N=1.524702 of the 5th positive lens Q5; Last a slice lens Qb of the second lens combination L2 i.e. the 9th negative lens Q9, and its refractive index N=1.58547 all satisfies condition: 1.52＜N＜1.6.
In embodiments of the present invention, focal distance f during wide-angle position
t=3.0mm, focal distance f when taking the photograph distant positions
w=8.0mm,
Fig. 2 A is the spherical aberration figure of the present invention when wide-angle position; Fig. 2 B is the spherical aberration figure of the present invention when taking the photograph distant positions.This figure chooses optical wavelength between 480nm to 850nm.
From Fig. 2 A, Fig. 2 B, Fig. 3 A, Fig. 3 B, Fig. 4 A and Fig. 4 B as can be known, no matter the present invention is taking the photograph distant positions or wide-angle position, all can effectively compensate the spherical aberration and the curvature of field, guarantees the image quality of camera lens.
Claims (10)
1. a large aperture monitoring camera lens is characterized in that: comprise first lens combination (L1), auto iris (ST) with negative focal length and second lens combination (L2) with positive focal length along optical axis from object space; Second lens combination (L2) comprises at least three lens, and wherein first lens (Qa) and last a slice lens (Qb) are the plastic aspherical element lens, and first lens (Qa) has positive focal length, and last a slice lens (Qb) has negative focal length;
Meet the following conditions between the focal length of first lens (Qa) and last a slice lens (Qb): 2.0＜| fa/fb|＜4.0;
Wherein, fa is the focal length of first lens (Qa) of second lens combination (L2),
Fb is the focal length of last a slice lens (Qb) of second lens combination (L2).
2. a kind of large aperture monitoring camera lens according to claim 1, it is characterized in that: the f-number FNo. of described auto iris (ST) satisfies condition: FNo.≤1.2.
3. a kind of large aperture monitoring camera lens according to claim 2, it is characterized in that: the refractive index N of first lens (Qa) of described second lens combination (L2) and last a slice lens (Qb) all satisfies condition: 1.52＜N＜1.6.
4. a kind of large aperture monitoring camera lens according to claim 2 is characterized in that: the focal distance f of described first lens combination (L1)
L1Focal distance f with second lens combination (L2)
L2Between meet the following conditions:
0.7＜|f
L1/f
L2|＜0.9。
5. a kind of large aperture monitoring camera lens according to claim 2, it is characterized in that: camera lens also satisfies condition:
Wherein, f
wBe camera lens focal length when the wide-angle position, f
tBe camera lens focal length when taking the photograph distant positions.
6. according to any described a kind of large aperture monitoring camera lens of claim 1 to 5, it is characterized in that: described first lens combination (L1) comprises first negative lens (Q1), second negative lens (Q2), the 3rd positive lens (Q3) and the 4th negative lens (Q4); Wherein the 3rd lens (Q3) and the 4th lens (Q4) are bonding.
7. a kind of large aperture monitoring camera lens according to claim 6, it is characterized in that: described first negative lens (Q1) is convex surface, is concave surface towards image planes towards object plane, second negative lens (Q2) is a biconcave lens, the 3rd positive lens (Q3) is convex surface, is concave surface towards image planes towards object plane, and the 4th negative lens (Q4) is convex surface, is concave surface towards image planes towards object plane.
8. a kind of large aperture monitoring camera lens according to claim 7, it is characterized in that: described second lens combination (L2) comprises the 5th positive lens (Q5), the 6th positive lens (Q6), the 7th negative lens (Q7), the 8th positive lens (Q8) and the 9th negative lens (Q9); The 5th positive lens (Q5) is the plastic aspherical element lens with the 9th negative lens (Q9), has positive focal length after the 7th negative lens (Q7) and the 8th positive lens (Q8) are bonding.
9. a kind of large aperture monitoring camera lens according to claim 8, it is characterized in that: the 5th positive lens (Q5) is convex surface, is concave surface towards image planes towards object plane, the 6th positive lens (Q6) is a biconvex lens, the 7th negative lens (Q7) is convex surface, is concave surface towards image planes towards object plane, the 8th positive lens (Q8) is a biconvex lens, and the 9th negative lens (Q9) is a biconcave lens.
10. a kind of large aperture monitoring camera lens according to claim 9 is characterized in that: the f-number FNo.=1.0 of described auto iris (ST).
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| CN200910040992XA CN101943789B (en) | 2009-07-09 | 2009-07-09 | Large-aperture monitoring lens |
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|---|---|---|---|
| CN200910040992XA CN101943789B (en) | 2009-07-09 | 2009-07-09 | Large-aperture monitoring lens |
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| CN102466860A (en) * | 2010-11-17 | 2012-05-23 | 株式会社腾龙 | Wide angle lens |
| WO2016019487A1 (en) * | 2014-08-04 | 2016-02-11 | 深圳市大族激光科技股份有限公司 | Optical lens |
| CN106443979A (en) * | 2016-07-21 | 2017-02-22 | 苏州莱能士光电科技股份有限公司 | High-resolution 360-degree panorama intelligent household one-body lens |
| CN107132643A (en) * | 2016-02-26 | 2017-09-05 | 亚太精密工业(深圳)有限公司 | Wide-angle lens |
| CN112099205A (en) * | 2020-11-16 | 2020-12-18 | 江西联创电子有限公司 | Wide-angle lens |
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| CN112462494A (en) * | 2020-11-04 | 2021-03-09 | 凤凰光学股份有限公司 | Long-focus large-aperture monitoring lens |
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| WO2016019487A1 (en) * | 2014-08-04 | 2016-02-11 | 深圳市大族激光科技股份有限公司 | Optical lens |
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| CN107132643A (en) * | 2016-02-26 | 2017-09-05 | 亚太精密工业(深圳)有限公司 | Wide-angle lens |
| CN106443979A (en) * | 2016-07-21 | 2017-02-22 | 苏州莱能士光电科技股份有限公司 | High-resolution 360-degree panorama intelligent household one-body lens |
| CN113031204A (en) * | 2019-12-09 | 2021-06-25 | 凤凰光学股份有限公司 | High-resolution low-distortion easily-processed optical lens |
| CN112462495A (en) * | 2020-11-04 | 2021-03-09 | 凤凰光学股份有限公司 | Long-focus small-volume monitoring lens |
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| CN113126265A (en) * | 2021-05-21 | 2021-07-16 | 舜宇光学(中山)有限公司 | Fixed focus lens |
| CN116520534A (en) * | 2023-06-28 | 2023-08-01 | 珠海市川富光学技术有限公司 | Wide-angle large-aperture short-flange video lens with focal length of 25mm |
| CN116520534B (en) * | 2023-06-28 | 2023-08-25 | 珠海市川富光学技术有限公司 | Wide-angle large-aperture short-flange video lens with focal length of 25mm |
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| CN116661113A (en) * | 2023-07-26 | 2023-08-29 | 珠海市川富光学技术有限公司 | Medium-focus large-aperture short-flange video lens with focal length of 35mm |
| CN116626869B (en) * | 2023-07-26 | 2023-09-12 | 珠海市川富光学技术有限公司 | Medium-focus large-aperture short-flange video lens with focal length of 50mm |
| CN116661113B (en) * | 2023-07-26 | 2023-09-22 | 珠海市川富光学技术有限公司 | Medium-focus large-aperture short-flange video lens with focal length of 35mm |
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|---|---|
| CN101943789B (en) | 2012-01-25 |
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