CN108490586A - Monitoring tight shot - Google Patents
Monitoring tight shot Download PDFInfo
- Publication number
- CN108490586A CN108490586A CN201810498135.3A CN201810498135A CN108490586A CN 108490586 A CN108490586 A CN 108490586A CN 201810498135 A CN201810498135 A CN 201810498135A CN 108490586 A CN108490586 A CN 108490586A
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- China
- Prior art keywords
- lens
- focal length
- positive light
- ratio
- tight shot
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
Abstract
A kind of monitoring tight shot includes successively from the object side to image side：Front lens group, diaphragm, rear lens group and imaging surface, wherein：Front lens group includes successively：The first lens with positive light coke, the second lens with negative power, the third lens with negative power；Rear lens group includes successively：5th lens, the 6th lens and the 7th lens with positive light coke.The configuration of the present invention is simple passes through the distribution of rational focal power so that camera lens resolving power is excellent, it distorts small, parses reachable 5,000,000 pixels or more, it not only can be clear in visual light imaging, and clearly bright monitored picture can also be realized without focusing under night infrared light, it realizes day and night confocal；It can be used at 30 DEG C~80 DEG C, increase the range of the use environment condition of camera lens；Total length of light path is shorter, small volume, rear burnt larger, can be adapted to multiple interfaces.
Description
Technical field
The present invention relates to a kind of technology in optical device field, specifically a kind of monitoring tight shots.
Background technology
It is stepped up with the fast development of science and technology with people's awareness of safety, people have higher chase after to security protection
It asks, all kinds of monitoring cameras come into being with the demand in market, and a standardization, stability are high, and can match with video camera
It is to obtain information and be the most directly also mostly important mode to cover the camera lens that uses.The performance of camera lens is to obtain the pass of information content
Key, fixed focus monitoring camera lens in the prior art under daytime visible light conditions mainly for using, and night is in not visible infrared light
Under, image is dark and fuzzy, cannot be satisfied the demand of night monitoring.As monitoring range is more and more extensive, for the stabilization of camera lens
Property require it is also higher and higher, not only need day and night to monitor, camera lens also required still to can reach picture under various changes in environmental conditions
Face clearly requires, and the monitoring camera of the prior art pursues lightweight and miniaturization, using the non-spherical lens of a large amount of plastic materials,
The coefficient of expansion of plastics is big, be easy to cause focus drifting under high and low temperature environment, causes fuzzy pictures.
Invention content
The present invention is directed to deficiencies of the prior art, proposes a kind of monitoring tight shot, can reach high definition,
Day and night, large aperture distort small requirement.
The present invention is achieved by the following technical solutions：
The present invention includes successively from the object side to image side：Front lens group, diaphragm, rear lens group and imaging surface.
The front lens group includes successively：The first lens with positive light coke, second with negative power
Lens, the third lens with focal power.
The rear lens group includes successively：The 5th lens with positive light coke, the 6th lens with focal power and
The 7th lens with positive light coke.
The ratio of the focal length of first lens and the focal length of the second lens is (- 6.2, -4.07)；
The focal length of first lens and the second lens is respectively (5,7) with the ratio of the focal length of camera lens entirety
Falcate plastic aspheric lens preferably further can be used in the third lens, and the use of plastic aspherical element can
Reduction system number of lenses so that system smallerization lightness, hence it is evident that improve the aberration and the curvature of field of system so that supervised at night
The picture of control is apparent.
Cemented doublet or the lens with positive light coke are preferably further provided in the front lens group.
6th lens are cemented doublet, matched by dispersion to reduce aberration, and selective refraction rate difference is big
Two kinds of materials, it is easy to accomplish the compensation correction of difference so that night vision effect is further promoted
Protective glass is equipped between 7th lens and imaging surface.
The ratio of the length of the camera lens entirety and the focal length of camera lens entirety is (0.16,0.20).
The first corresponding lens of the product of the corresponding imaging image height in the maximum field of view angle of the camera lens are towards object
The ratio of the maximum clear aperture of side is (38.46,42.77).
Technique effect
Compared with prior art, the configuration of the present invention is simple passes through the distribution of rational focal power so that camera lens resolving power is excellent
Different, distortion is small, parses reachable 5,000,000 pixels or more, not only can be clear in visual light imaging, but also is not necessarily under night infrared light
Focusing can also realize clearly bright monitored picture, realize day and night confocal；It can be used at -30 DEG C~80 DEG C, increase camera lens
Use environment condition range；Total length of light path is shorter, small volume, rear burnt larger, can be adapted to multiple interfaces.
Description of the drawings
Fig. 1 is the structural schematic diagram of embodiment 1；
Fig. 2 is the color aberration characteristics curve graph of embodiment 1；
Fig. 3 is the astigmatism curvature of field figure of embodiment 1；
Fig. 4 is the distortion curve figure of embodiment 1；
Fig. 5 is MTF performance diagram of the embodiment 1 under -30 DEG C of cryogenic conditions；
Fig. 6 is MTF performance diagram of the embodiment 1 under 80 DEG C of hot conditions；
Fig. 7 is the structural schematic diagram of embodiment 2；
Fig. 8 is the color aberration characteristics curve graph of embodiment 2；
Fig. 9 is the astigmatism curvature of field figure of embodiment 2；
Figure 10 is the distortion curve figure of embodiment 2；
Figure 11 is MTF performance diagram of the embodiment 2 under -30 DEG C of cryogenic conditions；
Figure 12 is MTF performance diagram of the embodiment 2 under 80 DEG C of hot conditions；
Figure 13 is the structural schematic diagram of embodiment 3；
Figure 14 is the color aberration characteristics curve graph of embodiment 3；
Figure 15 is the astigmatism curvature of field figure of embodiment 3；
Figure 16 is the distortion curve figure of embodiment 3；
Figure 17 is MTF performance diagram of the embodiment 3 under -30 DEG C of cryogenic conditions；
Figure 18 is MTF performance diagram of the embodiment 3 under 80 DEG C of hot conditions；
In figure：Front lens group G1, diaphragm STP, rear lens group G2, imaging surface IMG, protective glass CG, the first lens L1,
Second lens L2, the third lens L3, the 4th lens L4, the first front lens L41, the first rear lens L42, the second front lens L61,
Two rear lens L62.
Specific implementation mode
Embodiment 1
As depicted in figs. 1 and 2, the present embodiment includes successively from the object side to image side：Front lens group G1, diaphragm STP, rear lens
Group G2 and imaging surface IMG.
The front lens group G1 includes successively：The first lens L1 with positive light coke, second with negative power
The 4th lens group L41/L42 of lens L2, the third lens L3 and positive light coke with negative power.
The 4th lens L4 is cemented doublet, including：The first front lens L41 with positive light coke and with negative light
First rear lens L42 of focal power.
The rear lens group G2 includes successively：The 5th lens L5, the 6th lens L6 with positive light coke and with just
7th lens L7 of focal power.
The 6th lens L6 is cemented doublet, including：The second front lens L61 with negative power and with positive light
Second rear lens L62 of focal power.
Protective glass CG is equipped between the rear lens group G2 and imaging surface IMG.
The refractive index and Abbe number of the first front lens L41, the first rear lens L42 meets:Nd41 (1.8,1.9), Vd41
(22,23) Nd42 (1.8,1.9), Vd42 (15,16)
Lens in the present embodiment in front lens group G1 rear lens groups G2 are all made of spherical glass lens.
The focal length F=3.56mm of camera lens in the present embodiment；Numerical aperture FNO=2.03mm；Camera lens entire length TTL=
22mm。
1 the present embodiment lens construction parameter of table
The focal length of the present embodiment camera lens entirety and the ratio of the length of camera lens entirety are EFL/TTL=0.16.
The ratio of first to the 7th lens L1~L7 of the present embodiment, the focal length and the focal length of camera lens entirety of each lens is：
F1/EFL=6.75, f2/EFL=-1.66, f3/EFL=-1.97, f41/EFL=0.71, f42/EFL=-1.0, f5/EFL=
2.25, f61/EFL=1.83, f62/EFL=1.87, f7/EFL=2.75.Pass through the distribution of rational focal power so that every
The focal power of piece eyeglass utmostly reduces tolerance sensitivity all in rational section.
The ratio of the focal length of the first lens L1 of the present embodiment and the focal length of the second lens L2 is f1/f2=-4.07
As shown in Figures 3 to 5, spherical aberration control is within positive and negative 0.05mm, it is seen that the infrared defocus of light and infrared light
Within 0.05mm, which meets the needs of day and night monitoring, also can blur-free imaging under night infrared light for amount control.
As shown in Figure 6 and Figure 7, the phenomenon that camera lens is without focus drifting in low temperature and hot environment still has excellent
Resolving power increases the use occasion of camera lens, improves the competitiveness of camera lens.
Embodiment 2
As shown in figure 8, compared with Example 1, the 4th lens L4 of front lens group G1 is with positive light focus in the present embodiment
The lens of degree；The 5th lens in rear lens group G2 are the lens with positive light coke；6th lens L6 is with negative power
The second front lens L61 and the second rear lens L62 composition with positive light coke cemented doublet.
Lens in the present embodiment in front lens group G1 rear lens groups G2 are all made of glass lens.
Compared with Example 1, the 4th lens L4 uses glass spherical lens, the focal length f of the glass spherical lens
(5,6), refractive index Nd meet (1.85,1.95), and Abbe number meets (17,18).
The refractive index of the second front lens L61 is 1.9459, Abbe number 17.98.
The refractive index of the second rear lens L62 is 1.4969, Abbe number 81.61.
The focal length F=3.56mm of camera lens in the present embodiment；Numerical aperture FNO=2.23mm；Camera lens entire length TTL=
21mm。
2 the present embodiment lens construction parameter of table
The focal length of the present embodiment camera lens entirety and the ratio of the length of camera lens entirety are EFL/TTL=0.17.
The ratio of first to the 7th lens L1~L7 of the present embodiment, the focal length and the focal length of camera lens entirety of each lens is：
F1/EFL=6.0, f2/EFL=-1.32, f3/EFL=-2.16, f4/EFL=1.72, f5/EFL=2.95, f61/EFL=-
1.75, f62/EFL=1.64, f7/EFL=3.6.
The ratio of the focal length of the first lens L1 of the present embodiment and the focal length of the second lens L2 is f1/f2=-4.56
As shown in Figures 9 to 11, spherical aberration control is within positive and negative 0.05mm, it is seen that the infrared defocus of light and infrared light
Amount control is within 0.025mm, and the aberration control of the system exists, within 10%.The camera lens meets the needs of day and night monitoring, at night
It also can blur-free imaging under late infrared light.
As shown in Figure 12 and Figure 13, the phenomenon that camera lens is without focus drifting in low temperature and hot environment still has excellent
Resolving power, increase the use occasion of camera lens, improve the competitiveness of camera lens.
Embodiment 3
As shown in figure 14, compared with Example 2, the front lens group G1 in the present embodiment include first to the third lens L1~
L3；
Compared with embodiment 1 and embodiment 2, the third lens L3 in the present embodiment is saturating using falcate plastic aspherical element
The refractive index of mirror, the plastic aspherical element meets (1.6,1.7), and Abbe number meets (20,22).
The refractive index of the second rear lens L61 is 1.9459, Abbe number 17.98.
The refractive index of the second rear lens L62 is 1.6396, Abbe number 58.17.
The focal length F=3.76mm of camera lens in the present embodiment；Numerical aperture FNO=1.98mm；Camera lens entire length TTL=
19mm。
3 the present embodiment lens construction parameter of table
| Surface serial number | Radius of curvature | Thickness | Refractive index | Abbe number |
| 1 | 11.3842 | 1.65 | 1.77582 | 49.98 |
| 2 | 34.9305 | 0.10 | ||
| 3 | 12.2937 | 0.95 | 1.999836 | 29.18 |
| 4 | 2.5458 | 2.04 | ||
| 5 | 32.1357 | 2.72 | 1.651 | 21.5 |
| 6 | -40.4181 | 1.56 | ||
| STP | Infinitely | 0.13 | ||
| 8 | 238.6012 | 2.07 | 1.996684 | 29.31 |
| 9 | -5.1648 | 1.74 | ||
| 10 | 33.54 | 0.50 | 1.945945 | 17.98 |
| 11 | 3.3131 | 1.42 | 1.63962 | 58.17 |
| 12 | -12.4288 | 0.10 | ||
| 13 | 11.8803 | 1.50 | 1.894996 | 34.91 |
| 14 | 21.1833 | 0.61 | ||
| 15 | Infinitely | 0.30 | BSC7 | |
| 16 | Infinitely | 3.00 | ||
| Image planes |
Wherein the 5th surface and the 6th surface are aspherical.
Table 4 is the asphericity coefficient of the present embodiment the third lens L3
| Surface serial number | K | A4 | B6 | C8 | D10 | E12 | F14 |
| 5 | 98.46303 | 0.003868 | 0.00036 | 1.24E-06 | 5.47E-06 | -7.68E-07 | 1.78E-07 |
| 6 | 30.79509 | 0.006964 | 0.00089 | -0.00023 | 3.80E-05 | 1.13E-05 | 4.76E-14 |
The quadratic surface coefficient of lens surface is K, quadravalence, six ranks, eight ranks, ten ranks, ten second orders, the aspherical system of ten quadravalences
Number is respectively A, B, C, D, E, F, is some z along the rise of optical axis direction in aspherical lens surface, meets：
The focal length of the present embodiment camera lens entirety and the ratio of the length of camera lens entirety are EFL/TTL=0.20.
The ratio of first to the 7th lens L1~L7 of the present embodiment, the focal length and the focal length of camera lens entirety of each lens is：
F1/EFL=5.71, f2/EFL=-0.92, f3/EFL=7.68, f5/EFL=1.39, f61/EFL=-1.08, f62/EFL=
1.14 f7/EFL=7.65.
The ratio of the focal length of the first lens L1 of the present embodiment and the focal length of the second lens L2 is f1/f2=-6.2
As shown in Figure 15 to Figure 17, spherical aberration controls within positive and negative 0.05mm, it is seen that light and infrared light it is infrared from
Coke amount control is within 0.05mm, and the aberration control of the system is within 5%.The camera lens meets the needs of day and night monitoring, at night
It also can blur-free imaging under late infrared light.
As shown in Figure 18 and Figure 19, the phenomenon that camera lens is without focus drifting in low temperature and hot environment still has excellent
Resolving power, increase the use occasion of camera lens, improve the competitiveness of camera lens.
Above-mentioned specific implementation can by those skilled in the art under the premise of without departing substantially from the principle of the invention and objective with difference
Mode carry out local directed complete set to it, protection scope of the present invention is subject to claims and not by above-mentioned specific implementation institute
Limit, each implementation within its scope is by the constraint of the present invention.
Claims (11)
1. a kind of monitoring tight shot, which is characterized in that include successively from the object side to image side：Front lens group, diaphragm, rear lens
Group and imaging surface, wherein：Front lens group includes successively：The first lens with positive light coke, second with negative power are thoroughly
Mirror, the third lens with negative power；Rear lens group includes successively：5th lens, the 6th lens and with positive light coke
7th lens.
2. monitoring tight shot according to claim 1, characterized in that be further provided in the front lens group
Four lens, the 4th lens use cemented doublet or the lens with positive light coke, wherein：Cemented doublet includes：With positive light
First front lens of focal power and the first rear lens with positive light coke.
3. monitoring tight shot according to claim 2, characterized in that when the 4th lens are using glued mirror
Piece, the focal length of the first front lens, the first rear lens and the 5th lens be with the ratio of the focal length of camera lens entirety respectively (0.71,
1.72)、(-1.08,2.95)、(-1.75,2.25)；
When the 4th lens use the lens with positive light coke, the focal length of the lens and the 5th lens whole with camera lens respectively
The ratio of the focal length of body is (0.71,1.72), (- 1.08,2.95).
4. monitoring tight shot according to claim 2 or 3, characterized in that after first front lens and first
Lens use spherical glass lens, and the focal length of the spherical glass lens is 6.13, refractive index 1.9459, Abbe number 17.98.
5. monitoring tight shot according to claim 1, characterized in that be further provided in the front lens group
Four lens, the 4th lens use cemented doublet or the lens with positive light coke, wherein：Cemented doublet includes：With positive light
First front lens of focal power and the first rear lens with positive light coke；
6th lens are cemented doublet, which includes：Second front lens and with positive light coke second after
Lens.
6. monitoring tight shot according to claim 5, characterized in that the 5th lens, the second front lens,
The focal length of two rear lens and the 7th lens respectively with the ratio of the focal length of camera lens entirety be (0.71,1.72), (- 1.08,2.95),
(-1.75,2.25)、(1.64,7.65)。
7. monitoring tight shot according to claim 5, characterized in that when the 4th lens use cemented doublet
When, the ratio of the focal length of the second front lens of the 6th lens and the focal length of camera lens entirety is (1.64,7.65)；When the described the 4th
When lens use the lens with positive light coke, the second front lens of the 6th lens and the focal length of the second rear lens respectively with camera lens
The ratio of whole focal length is (- 1.75,2.25), (1.64,7.65).
8. according to any monitoring tight shot in claims 1 to 3,5~7, characterized in that described first to the
The focal length of three lens respectively with the ratio of the focal length of camera lens entirety be (5.71,6.75), (- 1.66, -0.92), (- 2.16,
7.68)。
9. according to any monitoring tight shot in claims 1 to 3,5~7, characterized in that first lens
Focal length and the second lens focal length ratio be (- 6.2, -4.07)；The coke of the focal length and the third lens of second lens
Away from ratio be (0.12,0.84).
10. according to any monitoring tight shot in claims 1 to 3,5~7, characterized in that the camera lens is whole
The ratio of the length of body and the focal length of camera lens entirety is (0.16,0.20).
11. according to any monitoring tight shot in claims 1 to 3,5~7, characterized in that the camera lens
The ratio of maximum clear aperture of the first corresponding lens of the corresponding product for being imaged image height in maximum field of view angle towards object space
Value is (38.46,42.77).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810498135.3A CN108490586A (en) | 2018-05-23 | 2018-05-23 | Monitoring tight shot |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810498135.3A CN108490586A (en) | 2018-05-23 | 2018-05-23 | Monitoring tight shot |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108490586A true CN108490586A (en) | 2018-09-04 |
Family
ID=63351547
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810498135.3A Pending CN108490586A (en) | 2018-05-23 | 2018-05-23 | Monitoring tight shot |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11333859B2 (en) * | 2018-12-31 | 2022-05-17 | Aac Optics Solutions Pte. Ltd. | Camera optical lens including six lenses of +--++- refractive powers |
| US11372211B2 (en) * | 2018-12-31 | 2022-06-28 | Aac Optics Solutions Pte. Ltd. | Camera optical lens including six lenses of +−−++− refractive powers |
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| CN104937470A (en) * | 2013-02-28 | 2015-09-23 | 奥林巴斯株式会社 | Objective optical system |
| CN106501921A (en) * | 2016-12-21 | 2017-03-15 | 江西联益光学有限公司 | Unmanned plane pick-up lens |
| JP2017125978A (en) * | 2016-01-14 | 2017-07-20 | 株式会社リコー | Imaging optical system and device having the imaging optical system |
| JP2018005002A (en) * | 2016-07-04 | 2018-01-11 | 株式会社リコー | Imaging optical system, imaging device and compound-eye imaging device |
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|---|---|---|---|---|
| JP2012220741A (en) * | 2011-04-08 | 2012-11-12 | Ricoh Co Ltd | Imaging lens and imaging apparatus |
| US20130235465A1 (en) * | 2012-03-09 | 2013-09-12 | Samsung Electronics Co., Ltd. | Zoom lens and photographing apparatus including the same |
| CN104937470A (en) * | 2013-02-28 | 2015-09-23 | 奥林巴斯株式会社 | Objective optical system |
| JP2017125978A (en) * | 2016-01-14 | 2017-07-20 | 株式会社リコー | Imaging optical system and device having the imaging optical system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| US11372211B2 (en) * | 2018-12-31 | 2022-06-28 | Aac Optics Solutions Pte. Ltd. | Camera optical lens including six lenses of +−−++− refractive powers |
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