CN109683280A - Big depth of field wide-angle optics, imaging device, optical lens - Google Patents
Big depth of field wide-angle optics, imaging device, optical lens Download PDFInfo
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- CN109683280A CN109683280A CN201910015091.9A CN201910015091A CN109683280A CN 109683280 A CN109683280 A CN 109683280A CN 201910015091 A CN201910015091 A CN 201910015091A CN 109683280 A CN109683280 A CN 109683280A
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- negative lens
- positive lens
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- 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
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
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- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
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Abstract
This application discloses a kind of big depth of field wide-angle optics, imaging device, optical lens, big depth of field wide-angle optics includes: the first bent moon negative lens, the first double-concave negative lens, the first biconvex positive lens, the second bent moon negative lens, crescent moon positive lens, the second biconvex positive lens, the second double-concave negative lens, third biconvex positive lens, the 4th biconvex positive lens and the third bent moon negative lens that are arranged successively from the object side to image side along light incident direction.The optical system has the big depth of field, big field angle, large aperture and great achievement image planes, and is suitable for that use is imaged under water.The another aspect of the application additionally provides the imaging device of the optical system, optical lens.
Description
Technical field
This application involves a kind of big depth of field wide-angle optics, imaging device, optical lens, belong to the optics of underwater monitoring
Field.
Background technique
It with the continuous development of underwater monitoring technology, needs to be monitored increasing space, to understand movement
The situation of change of target and its ambient enviroment.As patent CN201410040571.8 provides one kind, wide-angle and big relative opening
The Underwater Imaging camera lens of diameter；If patent CN201810722758.4 provides one kind, wide-angle, large aperture and big target surface it is underwater
Imaging lens.But underwater monitoring usually also needs to be monitored the target of different distance other than angle.For example, prison
Survey the situation of change of a moving object from far near.
Therefore, Underwater Imaging camera lens, other than wide-angle, large aperture and big target surface, it is also necessary to the big depth of field.The depth of field
(DOF), the subject that the imaging of clear image is measured can be obtained in camera lens or other imager forward positions by referring to
Longitudinal separation range.Big depth field imaging, then referring within the scope of relatively large distance, can obtain clear image before and after the subject.
Summary of the invention
According to the one aspect of the application, a kind of big depth of field wide-angle optics is provided, which has big scape
Deep, big field angle, large aperture and great achievement image planes, and be suitable for that use is imaged under water.
The big depth of field wide-angle optics characterized by comprising along light incident direction, from the object side to image side according to
The first bent moon negative lens, the first double-concave negative lens, the first biconvex positive lens, the second bent moon negative lens, the crescent moon of secondary arrangement are just saturating
Mirror, the second biconvex positive lens, the second double-concave negative lens, third biconvex positive lens, the 4th biconvex positive lens and third bent moon are negative saturating
Mirror.
Optionally, the cemented surface of first biconvex positive lens and the second bent moon negative lens is glued, and described second is curved
The cemented surface of month negative lens is towards object side.
Optionally, the cemented surface of second biconvex positive lens and second double-concave negative lens is glued, second pair described
The cemented surface gluing of recessed negative lens is towards object side.
Optionally, the cemented surface of the 4th biconvex positive lens and the third bent moon negative lens is glued, and the third is curved
Month negative lens cemented surface gluing is towards object side.
Optionally, the first bent moon negative lens meets the following conditions,
| f1 | < 11mm
N1 > 1.85
Wherein, f1 indicates that the focal length of the first bent moon negative lens, n1 indicate the refractive index of the first bent moon negative lens.In order to as far as possible
Expand field angle, it is preferable that
Optionally, first double-concave negative lens meet the following conditions,
| f2 | < 10mm
N2 < 1.7
Wherein, f2 indicates that the focal length of the first double-concave negative lens, n2 indicate the refractive index of the first double-concave negative lens.In order to correct
The curvature of field, it is preferable that
Optionally, first biconvex positive lens meet the following conditions,
N3 > 1.8
Wherein, n3 indicates the refractive index of the first biconvex positive lens.In order to reduce the inclined refraction angle of light, it is preferable that n3
=1.81.
Optionally, the second bent moon negative lens meets the following conditions,
N4 > 1.7
V4 < 30
Wherein, n4 indicates the refractive index of the second bent moon negative lens, and v4 indicates the abbe number of the second bent moon negative lens.In order to
It corrects ratio chromatism, and reduces the refraction angle of light, it is preferable that
Optionally, the crescent moon positive lens meets the following conditions,
18 < | f5 | < 22
N5 > 1.9
Wherein, f5 indicates the focal length of crescent moon positive lens, and wherein n5 indicates the refractive index of crescent moon positive lens.In order to correct astigmatism
Reduce the refraction angle of light simultaneously, it is preferable that
Optionally, second biconvex positive lens meet the following conditions,
Δ Pgf > 0.01
Dn/dt < -6
Wherein, Δ Pgf indicates that the second order spectrum abbe number of the second biconvex positive lens, dn/dt indicate that the second biconvex is just saturating
Thermal refractive index coefficient of the mirror in 0~20 degree Celsius of lower F ' light.In order to realize no thermalization and correction second order spectrum, it is preferable that
In the application, " the big depth of field " refers to that imaging clearly range of the subject before camera lens is the imaging of 0.5m to 4m
Mode.
" negative lens " refers to the lens that the focal length of eyeglass is negative.
" positive lens " refers to the lens that the focal length of eyeglass is positive.
" bent moon negative lens " refers to negative meniscus.
" double-concave negative lens " refer to two sides all and are the negative lens of concave surface.
" biconvex positive lens " refer to two sides all and are the positive lens on convex surface.
" crescent moon positive lens " refers into the positive lens of selenodont.
According to the another aspect of the application, a kind of big depth of field wide-angle image device is provided, including as described in above-mentioned
Big depth of field wide-angle optics.
Those skilled in the art can be as needed, by above-mentioned optical system, is assembled into imaging device, such as be assembled into mirror
Head uses.
According to the another aspect of the application, a kind of big depth of field wide-angle optical lens are provided, including as described in above-mentioned
Big depth of field wide-angle optics.
Optionally, including along light incident direction, the ball cover and the big depth of field wide-angle that are arranged successively from the object side to image side
Optical system, the ball cover are set in the big depth of field wide-angle optics.
Ball cover mainly shields, it is preferable that ball cover is made of PMMA material.PMMA material translucency is fabulous, machine
Tool intensity is higher, and heat resistance, winter resistance and weatherability are all preferable, and corrosion resistance and insulating properties are good, and under certain condition,
Dimensionally stable is easily worked
Optionally, the CRA of the big depth of field wide-angle optical lens meets the following conditions,
15 ° of CRA <
Wherein, CRA is incident angle of maximum field of view's chief ray in image planes.
In order to increase the depth of field, it is preferable that CRA=14.8 °.
Preferably, under conditions of meeting image quality requirement, in order to control the size of camera lens, the TTHI of this camera lens meets following
Condition,
TTHI=49.9mm
Wherein TTHI indicates camera lens overall length.
The beneficial effect that the application can generate includes:
1) big depth of field wide-angle optics provided herein, use when being particularly suitable for being imaged under water.Under water
In use, more visible big depth field imaging effect still can be obtained.
2) big depth of field wide-angle optical lens provided herein, with wide-angle, large aperture, big target surface and the big depth of field
Imaging characteristics.Meet the demand being monitored to increasing hydrospace.
Detailed description of the invention
Fig. 1 is the optical system diagram in a kind of embodiment of the application；
Fig. 2 is the camera lens outline drawing in a kind of embodiment of the application；
Fig. 3 is to pass the performance diagram of letter in best object distance 150lp/mm in a kind of embodiment of the application；
Fig. 4 is in the point range figure that wavelength is 480nm light in a kind of embodiment of the application, and putting size unit is um, wherein
(a) 0.0 degree of field angle；(b) 29.0 degree of field angle；(c) 40.0 degree of field angle；(d) 50.0 degree of field angle；(e) field angle 60.0
Degree；(f) 70.0 degree of field angle；
Fig. 5 is in the curvature of field and distortion figure that wavelength is 480nm light in a kind of embodiment of the application, wherein (a) is the curvature of field
Figure；It (b) is distortion figure；
Fig. 6 is axial chromatic curve figure in a kind of embodiment of the application；
Fig. 7 is a kind of embodiment moderate multiplying factor chromatic curve figure of the application；
Fig. 8 is illuminance of image plane curve graph in a kind of embodiment of the application；
Fig. 9 is to pass the performance diagram of letter in 450mm object distance 100lp/mm in a kind of embodiment of the application；
Figure 10 is to pass the performance diagram of letter in 10m object distance 100lp/mm in a kind of embodiment of the application.
Component and reference signs list:
| Component names | Appended drawing reference |
| First bent moon negative lens | G1 |
| First double-concave negative lens | G2 |
| First biconvex positive lens | G3 |
| Second bent moon negative lens | G4 |
| Crescent moon positive lens | G5 |
| Second biconvex positive lens | G6 |
| Second double-concave negative lens | G7 |
| Third biconvex positive lens | G8 |
| 4th biconvex positive lens | G9 |
| Third bent moon negative lens | G10 |
| Ball cover | A |
Specific embodiment
The application is described in detail below with reference to embodiment, but the application is not limited to these embodiments.
Referring to Fig. 1, the embodiment 1 of big depth of field wide-angle optics provided by the present application, including along light incident direction, from
The first bent moon negative lens G1 that object side is arranged successively to image side, the first double-concave negative lens G2, the first biconvex positive lens G3, second is curved
Month negative lens G4, crescent moon positive lens G5, the second biconvex positive lens G6, the second double-concave negative lens G7, third biconvex positive lens G8, the
Four biconvex positive lens G9, third bent moon negative lens G10.
The convex surface of first bent moon negative lens G1 is towards object side.The glue of first biconvex positive lens G3 and the second bent moon negative lens G4
Conjunction face is glued.The cemented surface of second bent moon negative lens G4 is towards object side.Second biconvex positive lens G6 and the second double-concave negative lens G7
Cemented surface it is glued.The cemented surface of second double-concave negative lens G7 is towards object side.4th biconvex positive lens G9 and third bent moon are negative saturating
The cemented surface of mirror G10 is glued.The cemented surface of third bent moon negative lens G10 is towards object side.
The airspace of first bent moon negative lens G1 and the first double-concave negative lens G2 are 6.9mm, the first double-concave negative lens G2
Airspace between the first biconvex positive lens G3 is 2.6mm, between the second bent moon negative lens G4 and crescent moon positive lens G5
Airspace is 0.1mm, and the airspace between crescent moon positive lens G5 and the second biconvex positive lens G6 is 5.7mm, the second concave-concave
Air distance between negative lens G7 and third biconvex positive lens G8 is 0.5, and third biconvex positive lens G8 and the 4th biconvex are just saturating
Air distance between mirror G9 is 0.1mm.
In order to expand field angle as far as possible, the first bent moon negative lens G1 meets the following conditions,
| f1 |=10.5mm
N1=1.91
Wherein, f1 indicates that the focal length of the first bent moon negative lens G1, n1 indicate the refractive index of the first bent moon negative lens G1.
In order to correct the curvature of field, double-concave negative lens G2 meets the following conditions,
| f2 |=9.5mm
N2=1.59
Wherein f2 indicates that the focal length of double-concave negative lens G2, n2 indicate the refractive index of double-concave negative lens G2.
In order to reduce the inclined refraction angle of light, biconvex positive lens G3 meets the following conditions,
N3=1.81
Wherein n3 indicates the refractive index of biconvex positive lens G3.
In order to correct ratio chromatism, and reduce the refraction angle of light, the second bent moon negative lens G4 meets the following conditions,
N4=1.73
V4=28.3
Wherein n4 indicates the refractive index of the second bent moon negative lens G4, and v4 indicates the abbe number of the second bent moon negative lens G4.
In order to correct astigmatism while reduce the refraction angle of light, crescent moon positive lens G5 meets the following conditions,
| f5 |=20.6
N5=1.91
Wherein f5 indicates the focal length of crescent moon positive lens G5, and wherein n5 indicates the refractive index of crescent moon positive lens G5.
In order to realize that no thermalization and correction second order spectrum, the second biconvex positive lens G6 meet the following conditions,
Δ Pgf=0.0142
Dn/dt=-7.0
Wherein Δ Pgf indicates that the second order spectrum abbe number of the second biconvex positive lens G6, dn/dt second indicate that biconvex is just saturating
The thermal refractive index coefficient of F ' light of the mirror G6 under 0~20 degree Celsius.
The big depth of field wide-angle optics of embodiment 1
Referring to Fig. 1, in big depth of field wide-angle optical lens embodiment 1 provided by the present application, including big depth of field wide angle optical system
Embodiment 1 of uniting and ball cover A.Along light incident direction, it is arranged successively from object space, ball cover, big depth of field wide-angle optics and image space
, ball cover A is covered in big depth of field wide-angle optics.The airspace of ball cover A and the first bent moon negative lens G1 are 4.7mm.
In the present embodiment, ball cover A is made of PMMA material.
In order to increase the depth of field, CRA meets the following conditions,
CRA=14.8 °
Wherein, incident angle of the CRA maximum field of view chief ray in image planes.
In the present embodiment, under conditions of meeting image quality requirement, in order to control the size of camera lens, the TTHI of this camera lens is full
Sufficient the following conditions,
TTHI=49.9mm
Wherein TTHI indicates camera lens overall length.
In the present embodiment, above-mentioned camera lens technical indicator achieved is as follows:
1, image quality: 150lp/mm > 0.3 MTF@；
2, underwater field angle > 130 °；
3, coverage 450mm-10m；
4, aperture: it is better than F1.8；
5, interface CS；
6, spectral region 440nm-540nm；
7, overall length < 50mm；
8, diameter of lens < 35mm；
9, transmitance > 80%, relative illumination > 70%；
10, -30 DEG C~+50 DEG C of temperature range.
In the present embodiment, the parameter of each eyeglass of above-mentioned camera lens is as shown in the table:
| Surface serial number | Radius of curvature | Thickness | Refractive index | Abbe number | Number |
| 0 (object plane) | It is infinitely great | 1000.0 | 1.34 | 57.9 | Seawater |
| 1 | 51.3 | 5.5 | 1.49 | 57.4 | A |
| 2 | 45.8 | 4.7 | |||
| 3 | 30.7 | 1.5 | 1.9 | 35.3 | G1 |
| 4 | 7.2 | 6.9 | |||
| 5 | -11.6 | 1.0 | 1.6 | 67.3 | G2 |
| 6 | 11.6 | 2.6 | |||
| 7 | 41.2 | 5.1 | 1.8 | 46.6 | G3 |
| 8 | -11.9 | 2.2 | 1.7 | 28.3 | G4 |
| 9 | -18.7 | 0.1 | |||
| 10 | 14.2 | 1.6 | 1.9 | 35.3 | G5 |
| 11 | 51.4 | 5.7 | |||
| 12 (light bars) | 10.3 | 1.8 | 1.6 | 68.5 | G6 |
| 13 | -6.1 | 0.7 | 1.7 | 29.5 | G7 |
| 14 | 12.0 | 0.5 | |||
| 15 | 22.7 | 2.0 | 1.9 | 31.4 | G8 |
| 16 | -22.7 | 0.1 | |||
| 17 | 16.5 | 2.2 | 1.6 | 53.2 | G9 |
| 18 | -5.8 | 0.7 | 1.7 | 27.8 | G10 |
| 19 | -25.4 | 4.9 | |||
| 20 (image planes) | It is infinitely great |
Fig. 3~10 are to be simulated in embodiment 1 after system according to the design parameter in each embodiment by Ray-tracing Method,
Analysis measurement is carried out by following result of the existing measurement method to the system to obtain.It is public to ignore real lens processing in embodiment
Figure difference is measured caused by difference.
In the present embodiment, as shown in figure 3, the modulation transfer function of gained camera lens regards entirely in 150lp/mm in the present embodiment
Field both greater than 0.4, wherein T1 indicates that meridian, S1 indicate the sagitta of arc；As shown in figure 4, the resolving power of the camera lens full filed is better than
The resolving power of 3.3um, central vision are better than 2um；
As shown in Fig. 5 (a)~(b), the distortion of the camera lens is about 65%, but in actual imaging, can use image
Processing, is corrected to orthoscopic image for picture；
As shown in fig. 6, the axial chromatic aberration of the camera lens is 30um or so, curve is close to linear color difference, this is because glass
Glass material is bigger in the dispersion of shortwave；
As shown in fig. 7, the ratio chromatism, of the camera lens is within diffraction limit；
As shown in figure 8, the relative illumination of the camera lens is better than 85%；
Gained camera lens in the present embodiment is used in seawater, as shown in Fig. 9~10, the camera lens passes letter for 100lp/mm
Depth of field be 450mm to 10m, wherein T1 indicate meridian, S1 indicate the sagitta of arc.In view of the absorption of water, 10m is with the saturating of foreign object
Cross that rate is very low, therefore gained camera lens can be to the property other than 450mm at sharply defined image in the present embodiment, i.e., it has
The very big depth of field.
The big depth of field wide-angle optical lens of embodiment 2
Referring to fig. 2, the difference of big depth of field wide-angle optical lens embodiment 2 and big depth of field wide-angle optical lens embodiment 1 exists
In: the optical system in embodiment 1 is installed in shell, camera lens as shown in Figure 2 is assembled into.Pass through the fixed each eyeglass of shell
Between position and interval.Ball cover A is covered at far from image planes on shell object side, and the other side of lens housing is image planes.
The above is only several embodiments of the application, not does any type of limitation to the application, although this Shen
Please disclosed as above with preferred embodiment, however not to limit the application, any person skilled in the art is not taking off
In the range of technical scheme, a little variation or modification are made using the technology contents of the disclosure above and is equal to
Case study on implementation is imitated, is belonged in technical proposal scope.
Claims (10)
1. a kind of big depth of field wide-angle optics characterized by comprising along light incident direction, from the object side to image side successively
Arrangement the first bent moon negative lens, the first double-concave negative lens, the first biconvex positive lens, the second bent moon negative lens, crescent moon positive lens,
Second biconvex positive lens, the second double-concave negative lens, third biconvex positive lens, the 4th biconvex positive lens and third bent moon negative lens.
2. big depth of field wide-angle optics according to claim 1, which is characterized in that first biconvex positive lens and institute
The cemented surface for stating the second bent moon negative lens is glued, and the cemented surface of the second bent moon negative lens is towards object side.
3. big depth of field wide-angle optics according to claim 1, which is characterized in that second biconvex positive lens and institute
The cemented surface for stating the second double-concave negative lens is glued, and the cemented surface gluings of second double-concave negative lens is towards object side.
4. big depth of field wide-angle optics according to claim 1, which is characterized in that the 4th biconvex positive lens and institute
The cemented surface for stating third bent moon negative lens is glued, and the third bent moon negative lens cemented surface gluing is towards object side.
5. big depth of field wide-angle optics according to claim 1, which is characterized in that the first bent moon negative lens meets
The following conditions,
| f1 | < 11mm
N1 > 1.85
Wherein, f1 indicates that the focal length of the first bent moon negative lens, n1 indicate the refractive index of the first bent moon negative lens；
Preferably, first double-concave negative lens meet the following conditions,
| f2 | < 10mm
N2 < 1.7
Wherein, f2 indicates that the focal length of the first double-concave negative lens, n2 indicate the refractive index of the first double-concave negative lens；
Preferably, first biconvex positive lens meet the following conditions,
N3 > 1.8
Wherein, n3 indicates the refractive index of the first biconvex positive lens；
Preferably, the second bent moon negative lens meets the following conditions,
N4 > 1.7
V4 < 30
Wherein, n4 indicates the refractive index of the second bent moon negative lens, and v4 indicates the abbe number of the second bent moon negative lens；
Preferably, the crescent moon positive lens meets the following conditions,
18 < | f5 | < 22
N5 > 1.9
Wherein, f5 indicates the focal length of crescent moon positive lens, and wherein n5 indicates the refractive index of crescent moon positive lens.
6. big depth of field wide-angle optics according to claim 1, which is characterized in that second biconvex positive lens meet
The following conditions,
Δ Pgf > 0.01
Dn/dt < -6
Wherein, Δ Pgf indicates that the second order spectrum abbe number of the second biconvex positive lens, dn/dt indicate the second biconvex positive lens 0
The thermal refractive index coefficient of~20 degrees Celsius of lower F ' light.
7. a kind of big depth of field wide-angle image device, which is characterized in that including the depth of field big as described in any one of claim 1~6
Wide-angle optics.
8. a kind of big depth of field wide-angle optical lens, which is characterized in that including the depth of field big as described in any one of claim 1~6
Wide-angle optics.
9. big depth of field wide-angle optical lens according to claim 8, which is characterized in that including along light incident direction, from
The ball cover and the big depth of field wide-angle optics that object side is arranged successively to image side, the ball cover are set to the big depth of field wide-angle light
In system.
10. big depth of field wide-angle optical lens according to claim 8, which is characterized in that the big depth of field wide angle optical mirror
The CRA of head meets the following conditions,
15 ° of CRA <
Wherein, CRA is incident angle of maximum field of view's chief ray in image planes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910015091.9A CN109683280B (en) | 2019-01-08 | 2019-01-08 | Wide-angle optical system with large depth of field, imaging device and optical lens |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910015091.9A CN109683280B (en) | 2019-01-08 | 2019-01-08 | Wide-angle optical system with large depth of field, imaging device and optical lens |
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| CN109683280B CN109683280B (en) | 2020-08-28 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111308835A (en) * | 2020-04-08 | 2020-06-19 | 东莞力途精密科技有限公司 | Wide-angle conversion lens for correcting underwater chromatic aberration and enlarging lens visual angle |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107748433A (en) * | 2017-11-24 | 2018-03-02 | 嘉兴中润光学科技有限公司 | Wide-angle interchangeable tight shot |
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2019
- 2019-01-08 CN CN201910015091.9A patent/CN109683280B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107748433A (en) * | 2017-11-24 | 2018-03-02 | 嘉兴中润光学科技有限公司 | Wide-angle interchangeable tight shot |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111308835A (en) * | 2020-04-08 | 2020-06-19 | 东莞力途精密科技有限公司 | Wide-angle conversion lens for correcting underwater chromatic aberration and enlarging lens visual angle |
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