CN104345427B - Video camera lens optical system and video camera - Google Patents
Video camera lens optical system and video camera Download PDFInfo
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- CN104345427B CN104345427B CN201310330125.6A CN201310330125A CN104345427B CN 104345427 B CN104345427 B CN 104345427B CN 201310330125 A CN201310330125 A CN 201310330125A CN 104345427 B CN104345427 B CN 104345427B
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- 230000003287 optical effect Effects 0.000 title claims abstract description 59
- 239000000463 material Substances 0.000 claims abstract description 29
- 150000001875 compounds Chemical class 0.000 claims description 11
- 238000009738 saturating Methods 0.000 claims 1
- 235000015170 shellfish Nutrition 0.000 claims 1
- 238000001429 visible spectrum Methods 0.000 abstract description 7
- 238000002329 infrared spectrum Methods 0.000 abstract description 6
- 238000003384 imaging method Methods 0.000 description 9
- 239000005357 flat glass Substances 0.000 description 7
- 239000011521 glass Substances 0.000 description 5
- 230000002093 peripheral effect Effects 0.000 description 5
- 230000003595 spectral effect Effects 0.000 description 5
- 230000004075 alteration Effects 0.000 description 4
- 230000004438 eyesight Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 239000005304 optical glass Substances 0.000 description 4
- 238000012546 transfer Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 3
- 238000004026 adhesive bonding Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000008901 benefit Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 230000004304 visual acuity Effects 0.000 description 1
Classifications
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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
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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
- G02B13/14—Optical objectives specially designed for the purposes specified below for use with infrared or ultraviolet radiation
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- Optics & Photonics (AREA)
- Health & Medical Sciences (AREA)
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- Lenses (AREA)
Abstract
The invention discloses a video camera lens optical system and a video camera. The video camera lens optical system comprises a dual-concave lens (1), a first dual-convex lens (2), and a dual-combined lens group which are successively arranged from object space to image space. The dual-combined lens group comprises a second dual-convex lens (3) and a concave-convex lens (4) which are combined together, and the second dual-convex lens (3) and the concave-convex lens (4) are sequentially arranged from the object space to the image space. The second dual-convex lens (3) and the concavo-convex lens (4) satisfy a formula (1) and a formula (2) which are described in the description. The video camera lens optical system may clearly form images in a visible spectrum and a near infrared spectrum, satisfies a requirement of a high-definition day and night video camera, uses four lenses produced by common material, and is simple in structure, easy to produce, and low in cost compared with a lens in a same specification.
Description
Technical field
The present invention relates to camcorder technology field, more particularly to a kind of camera lens optical system and video camera, especially
It is the lens optical system for day and night type video camera.
Background technology
Day and night type video camera refer to day and night can blur-free imaging video camera.Be at present take into account monitoring daytime and
The needs of night environmental monitoring, day and night type video camera application more come about extensive.The operating spectral of day and night type video camera during the day
Scope is visible spectrum (430nm to 700nm), and when night, operating spectral is near infrared spectrum (830nm to 870nm).Therefore,
Day and night the camera lens of the matched use of type video camera requirement all can blur-free imaging under visible spectrum and near infrared spectrum.Generally,
Operating spectral range is bigger, and lens optical system design difficulty is bigger.For ensureing that camera lens can be in visible spectrum and near infrared spectrum
Lower blur-free imaging, lens optical system structure is often more complicated than during only visible spectrum.
For the camera lens of existing day and night type video camera, often to realize preferably being imaged work(using five or more lens
Can, and the lens group being adopted comprises non-spherical lens mostly.This all makes the relatively costly of camera lens optical system.
Although there is also the better simply day and night type camera lens of some structures, the lack of resolution of imaging picture is it is impossible to meet one
A little detection fields higher to imaging definition requirement.
Content of the invention
It is an object of the invention to provide a kind of camera lens optical system is come at lower cost in wider work light
Preferable definition is realized in spectrum.
For achieving the above object, the present invention provides a kind of camera lens optical system, described camera lens optical system
System includes：The biconcave lens that arranges in order from object space to image space, the first biconvex lens, double compound lens group, wherein, described double
Compound lens group includes the second biconvex lens combined and concave-convex lens, is followed successively by the second lenticular from object space to image space
Mirror (3) and concave-convex lens (4), described second biconvex lens and concave-convex lens meet (1), (2) formula：
Wherein, ν3、ν4It is respectively the material Abbe number of the second biconvex lens and concave-convex lens,It is respectively second pair
Convex lens and the focal power of concave-convex lens,For the focal power of double compound lens groups, the object space side surface of described biconcave lens (1)
Radius of curvature (R11) be more than its image space side surface radius of curvature (R12)；The object space side table of described first biconvex lens (2)
The radius of curvature (R21) in face is more than the radius of curvature (R22) of its image space side surface；The object space side surface of described pair of compound lens group
Radius of curvature (R31) be more than its intermediate surface radius of curvature (R32) and less than its image space side surface radius of curvature
(R33).
Preferably, described second biconvex lens and concave-convex lens are glued together.
Preferably, described biconcave lens, the both side surface of the first biconvex lens, the second biconvex lens and concave-convex lens are ball
Face.
Preferably, described camera lens optical system further includes positioned at described biconcave lens and the first biconvex lens
Between aperture diaphragm.
Preferably, the material Abbe number of described second biconvex lens is different from the material Abbe number of described concave-convex lens, and
Both differences are more than 25.
Preferably, the material Abbe number of described second biconvex lens is different from the material Abbe number of described concave-convex lens, and
Both differences are more than or equal to 30, less than or equal to 50.
Preferably, the material Abbe number of described biconcave lens is more than or equal to 60, and refractive index is less than 1.5.
The present invention further provides a kind of video camera, described video camera includes camera lens optical system as above
System.
Preferably, described video camera is day and night type video camera.
The camera lens optical system of the present invention equal energy blur-free imaging under visible spectrum and near infrared spectrum, meets high
The use of clear day and night type video camera, structure is simple simultaneously, using the spherical lens of 4 common materials, easily manufactured, and same specification
Camera lens to compare cost relatively low.
Brief description
Fig. 1 is the structural representation of the camera lens optical system according to one embodiment of the invention.
Fig. 2 is the MTF curve figure when working by day for the camera lens optical system shown in Fig. 1.
Fig. 3 is the MTF curve figure in night operation for the camera lens optical system shown in Fig. 1.
Fig. 4 is the MTF curve figure of the camera lens optical system low frequency when working by day shown in Fig. 1.
Fig. 5 is the MTF curve figure of the camera lens optical system low frequency in night operation shown in Fig. 1.
Fig. 6 is the defocusing curve figure when working by day for the camera lens optical system shown in Fig. 1.
Fig. 7 is the defocusing curve figure in night operation for the camera lens optical system shown in Fig. 1.
Reference：
| 1 | Biconcave lens | 4 | Concave-convex lens |
| 2 | First biconvex lens | 5 | Flat glass |
| 3 | Second biconvex lens |
Specific embodiment
For making purpose, technical scheme and advantage that the present invention is implemented clearer, below in conjunction with the embodiment of the present invention
Accompanying drawing, the technical scheme in the embodiment of the present invention is further described in more detail.In the accompanying drawings, identical from start to finish or class
As the label element that represents same or similar element or there is same or like function.Described embodiment is the present invention
A part of embodiment, rather than whole embodiments.Embodiment below with reference to Description of Drawings is exemplary it is intended to use
In the explanation present invention, and it is not considered as limiting the invention.Based on the embodiment in the present invention, ordinary skill people
The every other embodiment that member is obtained under the premise of not making creative work, broadly falls into the scope of protection of the invention.Under
Face combines accompanying drawing and embodiments of the invention is described in detail.
In describing the invention it is to be understood that term " " center ", " longitudinal ", " horizontal ", "front", "rear",
The orientation of instruction such as "left", "right", " vertical ", " level ", " top ", " bottom " " interior ", " outward " or position relationship are based on accompanying drawing institute
The orientation showing or position relationship, are for only for ease of the description present invention and simplify description, rather than the dress of instruction or hint indication
Put or element must have specific orientation, with specific azimuth configuration and operation, therefore it is not intended that protecting to the present invention
The restriction of scope.
Fig. 1 is the structural representation of camera lens optical system provided by the present invention.In FIG,
R11 is the radius of curvature of the front surface of biconcave lens 1；
R12 is the radius of curvature on the rear surface of biconcave lens 1；
R21 is the radius of curvature of the front surface of the first biconvex lens 2；
R22 is the radius of curvature on the rear surface of the first biconvex lens 2；
R31 is the radius of curvature of the front surface of cemented doublet；
R32 is the radius of curvature of the intermediate surface of cemented doublet；
R33 is the radius of curvature on the rear surface of cemented doublet；
D1 is the thickness of biconcave lens 1；
D2 is the distance on surface after biconcave lens 1 to aperture diaphragm；
D3 is the distance to the first biconvex lens 2 front surface for the aperture diaphragm；
D4 is the thickness of the first biconvex lens 2；
D5 is the thickness of the second biconvex lens 3；
D6 is the thickness of concave-convex lens 4；
D7 is the distance to before flat glass 5 for the surface after concave-convex lens 4；
D8 is the thickness of flat glass 5；
D9 is the distance on surface after flat glass 5 to image planes.
Fig. 1 illustrates camera lens optical system according to an embodiment of the invention.It is object space on the left of biconcave lens 1, put down
It is image space on the right side of surface glass 5.Along optical axis from the object side to the image side, the camera lens optical system of this embodiment press from object space to
The order of image space includes：Biconcave lens 1, aperture diaphragm, the first biconvex lens 2, cemented doublet (includes glued together the
Two biconvex lens 3 and concave-convex lens 4), and flat glass 5.During optical system works, the light of thing sequentially passes through biconcave lens
1, aperture diaphragm, biconvex lens 2, biconvex lens 3, concave-convex lens 4, then through flat glass 5, the image finally reaching image space passes
Sensor.Imageing sensor converts optical signals into electric signal, output image.
It is understood that other appropriate ways combination outside the second biconvex lens 3 and the acceptable gluing of concave-convex lens 4
Together, for example can be combined by peripheral hardware framework.
Flat glass 5 is used to protective glass and the glass of color filter that analog video camera sensor carries, and material is optics
Glass H-K9L (nd=1.52, vd=64.21).The optical system structure of therefore this embodiment is actual only to use 4 lens, that is,
Biconcave lens 1, the first biconvex lens 2, the second biconvex lens 3 and concave-convex lens 4.
The material of biconcave lens 1 is optical glass H-QK3 (nd=1.48, vd=70.13), the material of the first biconvex lens 2
Expect for optical glass H-LAF50A (nd=1.77, vd=49.60), the material of the second biconvex lens 3 is optical glass H-ZK9
(nd=1.62, vd=60.34), concave-convex lens 4 material is optical glass H-ZF52A (nd=1.85, vd=23.78).HQK3,
H-LAF50A, H-ZK9, H-ZF52A, H-K9L, are the environmental protection glass that Chengdu light glass factory manufactures.
Four lens both side surface of above-mentioned optical system are common sphere, special process aspherical need not be waited to process,
The center thickness of lens and edge thickness are suitable, and lens are easy to process.Biconvex lens 3 and concave-convex lens 4 compose double gluings thoroughly
Mirror, with correcting chromatic aberration.
In order to correct aberration, the optical system of the present invention employs the structure of one group of double compound lens group, by biconvex lens 3
Glued together with concave-convex lens 4, cemented doublet is positive lens, and focal power is justBiconvex lens 3 is positive lens,
Focal power is justConcave-convex lens 4 is negative lens, and focal power is negativeLens 3 and 4 parameters meet (1), (2)
Formula：
Wherein, ν3、ν4It is respectively the material Abbe number of the second biconvex lens 3 and concave-convex lens 4,It is respectively second
Biconvex lens 3 and the focal power of concave-convex lens 4.
(1), (2) formula is the focal power computing formula of the double compound lens group of achromatism.Wherein, ν3、ν4It is respectively the second biconvex
The material Abbe number of lens 3 and concave-convex lens 4.In this fact Example, the second biconvex lens 3 and concave-convex lens 4 are respectively adopted two
Plant different optical materials：H-ZK9 and H-ZF52A.H-ZK9 (nd=1.62, vd=60.34) refractive index is relatively low, and Abbe number is relatively
High.H-ZF52A (nd=1.85, vd=23.78) is contrary, and refractive index is higher, and Abbe number is relatively low.The Abbe number of two kinds of optical materials
Difference larger, can preferably correct aberration.
Referring to Fig. 1, the radius of curvature R 11 of the object space side surface of biconcave lens 1 is more than the radius of curvature of its image space side surface
R12；The radius of curvature R 21 of the object space side surface of described first biconvex lens 2 is more than the radius of curvature R 22 of its image space side surface；
The radius of curvature R 31 of the object space side surface of described pair of compound lens group is more than the radius of curvature R 32 of its intermediate surface and is less than it
The radius of curvature R 33 of image space side surface.Concrete data is referring to table 2.It is understood that the invention is not restricted to that table 2 lists is each
The concrete numerical value of radius of curvature, described curvature can (refractive index of such as lens material, Abbe number, lens as the case may be
Thickness and distance etc. parameter) select.
In the optical system of this embodiment, the material of first piece lens biconcave lens 1 is H-QK3 (nd=1.48, vd=
70.13), H-QK3 is the material of the low dispersion of high Abbe number, to correcting chromatic aberration effect substantially.
This optical system under visible spectrum and near infrared spectrum all can blur-free imaging, meet high definition day and night type video camera
Use.
The focal length of the optical system of the present embodiment is 4mm.The aperture diaphragm of optical system is placed in biconcave lens 1 and lenticular
Between mirror 2.The work f-number F# of optical system<2.5.
Table 1 lists the detailed technology feature of the optical system of the present embodiment.Table 2 list optical element title, from
The number of the lens face to image space number consecutively for the object space, the radius of curvature of each optical surface, along the distance between each optical surface of optical axis,
The title material of 4 lens.
Table 1
Table 2
The resolving power of camera lens is analyzed with contrast rendition ability with MTF (modulation transfer function) method.Measure MTF mode be
To be measured so that many fewer striplines can be presented in the range of a mm, its unit to be represented with lp/mm.
Fig. 2 show this optical system when working by day, and that is, operating spectral range is MTF during 430nm to 700nm
Figure.Central vision at 160lp/mm, modulation transfer function>0.4.Peripheral field at 120lp/mm, MTF>0.3.This
Bright optical system disclosure satisfy that the definition of 2,000,000 video cameras requires.With reference to shown in Fig. 4, central vision and peripheral field exist
At low frequency 20lp/mm, MTF>0.9.The mtf value of low frequency is high, and the permeability of the optical system imaging of the present invention is relatively good.
Fig. 3 show this optical system in night operation, and that is, operating spectral range is MTF during 830nm to 870nm
Figure.Central vision at 125lp/mm, modulation transfer function>0.5.Peripheral field at 120lp/mm, modulation transfer function
MTF>0.3.With reference to shown in Fig. 5, central vision and peripheral field at low frequency 20lp/mm, MTF>0.85.
Fig. 6 is the defocusing curve figure when working by day for the camera lens optical system provided by the present invention.Fig. 7 is this
The defocusing curve figure in night operation for the provided camera lens optical system is provided.Fig. 6 and Fig. 7 contrast is shown, this light
System respectively when day and night works, defocusing amount within 0.020mm, be effectively guaranteed optical system on daytime and
All can imaging clearly during night operation.
Last it is to be noted that：Above example only in order to technical scheme to be described, is not intended to limit.To the greatest extent
Pipe has been described in detail to the present invention with reference to the foregoing embodiments, it will be understood by those within the art that：It is still
Technical scheme described in foregoing embodiments can be modified, or wherein some technical characteristics are carried out with equivalent replacing
Change；And these modifications or replacement, do not make the essence of appropriate technical solution depart from the essence of various embodiments of the present invention technical scheme
God and scope.
Claims (9)
1. a kind of camera lens optical system is it is characterised in that include：
The biconcave lens (1) that arranges in order from object space to image space, the first biconvex lens (2), double compound lens group, wherein, institute
State the second biconvex lens (3) and the concave-convex lens (4) that double compound lens groups include combining, be followed successively by image space from object space
Second biconvex lens (3) and concave-convex lens (4), described second biconvex lens (3) and concave-convex lens (4) meet (1), (2) formula：
Wherein, ν3、ν4It is respectively the material Abbe number of the second biconvex lens (3) and concave-convex lens (4),It is respectively second
Biconvex lens (3) and the focal power of concave-convex lens (4),For the focal power of double compound lens groups, the thing of described biconcave lens (1)
The radius of curvature (R11) of square side surface is more than the radius of curvature (R12) of its image space side surface；Described first biconvex lens (2)
The radius of curvature (R21) of object space side surface is more than the radius of curvature (R22) of its image space side surface；The thing of described pair of compound lens group
The radius of curvature (R31) of square side surface is more than radius of curvature (R32) and the curvature less than its image space side surface of its intermediate surface
Radius (R33).
2. camera lens optical system as claimed in claim 1 is it is characterised in that described second biconvex lens (3) and recessed
Convex lens (4) are glued together.
3. camera lens optical system as claimed in claim 2 is it is characterised in that described biconcave lens (1), the first biconvex
The both side surface of lens (2), the second biconvex lens (3) and concave-convex lens (4) is sphere.
4. camera lens optical system as claimed in claim 1 is it is characterised in that further include saturating positioned at described concave-concave
Aperture diaphragm between mirror (1) and the first biconvex lens (2).
5. camera lens optical system as claimed in claim 1 is it is characterised in that the material of described second biconvex lens (3)
Material Abbe number is different from the material Abbe number of described concave-convex lens (4), and both differences are more than 25.
6. camera lens optical system as claimed in claim 1 is it is characterised in that the material of described second biconvex lens (3)
Material Abbe number is different from the material Abbe number of described concave-convex lens (4), and both differences are more than or equal to 30, less than or equal to 50.
7. camera lens optical system as claimed in claim 1 it is characterised in that described biconcave lens (1) material Ah
Shellfish number is more than or equal to 60, and refractive index is less than 1.5.
8. a kind of video camera is it is characterised in that include the camera lens optical system as any one of claim 1-7
System.
9. video camera as claimed in claim 8 is it is characterised in that described video camera is day and night type video camera.
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| CN201310330125.6A CN104345427B (en) | 2013-07-30 | 2013-07-30 | Video camera lens optical system and video camera |
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| CN104345427B true CN104345427B (en) | 2017-02-15 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201166730Y (en) * | 2007-12-25 | 2008-12-17 | 叶明华 | Tight shot with focal distance of 4.0 mm |
| US20130063829A1 (en) * | 2011-09-14 | 2013-03-14 | Samsung Techwin Co., Ltd. | Fixed focus lens system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3325261B2 (en) * | 2000-06-13 | 2002-09-17 | オリンパス光学工業株式会社 | Relay optics |
| JP2013120193A (en) * | 2011-12-06 | 2013-06-17 | Konica Minolta Advanced Layers Inc | Imaging lens |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201166730Y (en) * | 2007-12-25 | 2008-12-17 | 叶明华 | Tight shot with focal distance of 4.0 mm |
| US20130063829A1 (en) * | 2011-09-14 | 2013-03-14 | Samsung Techwin Co., Ltd. | Fixed focus lens system |
Non-Patent Citations (1)
| Title |
|---|
| 利用二元光学和消色差复合透镜组合校正二级光谱色差;屈恩世，杨正，汪岗，曹剑中;《光子学报》;20081130;第37卷(第11期);2274-2278 * |
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