CN104345427A - Video camera lens optical system and video camera - Google Patents
Video camera lens optical system and video camera Download PDFInfo
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- CN104345427A CN104345427A CN201310330125.6A CN201310330125A CN104345427A CN 104345427 A CN104345427 A CN 104345427A CN 201310330125 A CN201310330125 A CN 201310330125A CN 104345427 A CN104345427 A CN 104345427A
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- 230000003287 optical effect Effects 0.000 title claims abstract description 60
- 239000000463 material Substances 0.000 claims abstract description 28
- 150000001875 compounds Chemical class 0.000 claims description 11
- 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 10
- 239000005357 flat glass Substances 0.000 description 8
- 238000000034 method Methods 0.000 description 6
- 230000003595 spectral effect Effects 0.000 description 6
- 239000005304 optical glass Substances 0.000 description 5
- 230000002093 peripheral effect Effects 0.000 description 5
- 230000004075 alteration Effects 0.000 description 4
- 230000004438 eyesight Effects 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 239000011521 glass Substances 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000008901 benefit Effects 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 239000006059 cover glass Substances 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
- 239000003292 glue Substances 0.000 description 1
- 230000035699 permeability Effects 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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- 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. 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, wherein in the formulas (1) and (2), v3 and v4 are the abbe numbers of the material of the second dual-convex lens (3) and the concavo-convex lens (4) respectively, [phi]3 and [phi]4 are the focal power of the second dual-convex lens (3) and the concave-convex lens (4) respectively, and the [phi] is the focal power of the dual-combined lens group. 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, particularly relate to a kind of camera lens optical system and video camera, in particular for the lens optical system of day and night type video camera.
Background technology
Day and night refer to by day can the video camera of blur-free imaging with night for type video camera.At present for taking into account the needs of monitoring day and night environmental monitoring, day and night type camera application is more come about extensive.Time by day, day and night the operating spectral range of type video camera is visible spectrum (430nm to 700nm), and when night, operating spectral is near infrared spectrum (830nm to 870nm).Therefore, day and night type video camera require with it with the use of camera lens all can blur-free imaging under visible spectrum and near infrared spectrum.Usually, operating spectral range is larger, and lens optical system design difficulty is larger.For ensure camera lens can under visible spectrum and near infrared spectrum blur-free imaging, lens optical system structure is often than more complicated when only having visible spectrum.
For the camera lens of existing day and night type video camera, the lens of often employing five or more realize good imaging function, and the lens combination adopted comprises non-spherical lens mostly.This all makes the cost of camera lens optical system higher.Although also there is some structures better simply day and night type camera lens, the lack of resolution of imaging picture, the detection field that some are higher to imaging definition requirement can not be met.
Summary of the invention
A kind of camera lens optical system is the object of the present invention is to provide to come in wider operating spectral, to realize good sharpness at lower cost.
For achieving the above object, the invention provides a kind of camera lens optical system, described camera lens optical system comprises: the biconcave lens, the first biconvex lens and the two compound lens group that arrange in order from object space to image space, wherein, described pair of compound lens group comprises the second biconvex lens and concave-convex lens combined, and described second biconvex lens and concave-convex lens meet (1), (2) formula:
Wherein, v
3, ν
4be respectively the material Abbe number of the second biconvex lens and concave-convex lens,
be respectively the focal power of the second biconvex lens and concave-convex lens,
for the focal power of two compound lens group.
Preferably, described second biconvex lens and concave-convex lens glued together.
Preferably, the both side surface of described biconcave lens, the first biconvex lens, the second biconvex lens and concave-convex lens is sphere.
Preferably, the radius-of-curvature of the object space side surface of described biconcave lens is greater than the radius-of-curvature on its image side surface; The radius-of-curvature of the object space side surface of described first biconvex lens is greater than the radius-of-curvature on its image side surface; The radius-of-curvature of the object space side surface of described pair of compound lens group is greater than the radius-of-curvature of its intermediate surface and is less than the radius-of-curvature on its image side surface.
Preferably, described camera lens optical system comprises the aperture diaphragm between described biconcave lens and the first biconvex lens further.
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 greater 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, are 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 comprises camera lens optical system as above.
Preferably, described video camera is day and night type video camera.
Camera lens optical system of the present invention is equal energy blur-free imaging under visible spectrum and near infrared spectrum, meet the use of high definition day and night type video camera, structure is simple simultaneously, uses the spherical lens of 4 common materials, easily manufactured, to compare cost lower with the camera lens of same specification.
Accompanying drawing explanation
Fig. 1 is the structural representation of camera lens optical system according to an embodiment of the invention.
Fig. 2 is the MTF curve map when camera lens optical system shown in Fig. 1 works by day.
Fig. 3 is the MTF curve map of the camera lens optical system shown in Fig. 1 when night works.
Fig. 4 is the MTF curve map of low frequency when the camera lens optical system shown in Fig. 1 works by day.
Fig. 5 is the MTF curve map of the low frequency when night works of the camera lens optical system shown in Fig. 1.
Fig. 6 is the out of focus curve map when camera lens optical system shown in Fig. 1 works by day.
Fig. 7 is the out of focus curve map of the camera lens optical system shown in Fig. 1 when night works.
Reference numeral:
| 1 | Biconcave lens | 4 | Concave-convex lens |
| 2 | First biconvex lens | 5 | Flat glass |
| 3 | Second biconvex lens |
Embodiment
For making object of the invention process, technical scheme and advantage clearly, below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is further described in more detail.In the accompanying drawings, same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Described embodiment is the present invention's part embodiment, instead of whole embodiments.Be exemplary below by the embodiment be described with reference to the drawings, be intended to for explaining the present invention, and can not limitation of the present invention be interpreted as.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.Below in conjunction with accompanying drawing, embodiments of the invention are described in detail.
In describing the invention; it will be appreciated that; term " " center ", " longitudinal direction ", " transverse direction ", "front", "rear", "left", "right", " vertically ", " level ", " top ", " end " " interior ", " outward " etc. instruction orientation or position relationship be based on orientation shown in the drawings or position relationship; be only the present invention for convenience of description and simplified characterization; instead of instruction or imply indication device or element must have specific orientation, with specific azimuth configuration and operation, therefore can not be interpreted as limiting the scope of the invention.
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 of 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 of 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 of the rear surface of cemented doublet;
D1 is the thickness of biconcave lens 1;
D2 is the distance of biconcave lens 1 rear surface to aperture diaphragm;
D3 is the distance of aperture diaphragm to the first biconvex lens 2 front surface;
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 before concave-convex lens 4 rear surface to flat glass 5;
D8 is the thickness of flat glass 5;
D9 is the distance of flat glass 5 rear surface to image planes.
Fig. 1 illustrates camera lens optical system according to an embodiment of the invention.Being object space on the left of biconcave lens 1, is image space on the right side of flat glass 5.Along optical axis from the object side to the image side, the camera lens optical system of this embodiment comprises by from object space to the order of image space: biconcave lens 1, aperture diaphragm, the first biconvex lens 2, cemented doublet (comprising the second biconvex lens 3 glued together and concave-convex lens 4), and flat glass 5.During optical system works, the light of thing successively through biconcave lens 1, aperture diaphragm, biconvex lens 2, biconvex lens 3, concave-convex lens 4, then through flat glass 5, finally arrive the imageing sensor of image space.Light signal is transformed into electric signal by imageing sensor, output image.
Be understandable that, other appropriate ways outside the second biconvex lens 3 and concave-convex lens 4 can also glue together are combined, such as, can be combined by peripheral hardware framework.
Flat glass 5 is used to cover glass that analog video camera sensor carries and glass of color filter, and material is optical glass H-K9L(nd=1.52, vd=64.21).Therefore the optical system structure of this embodiment is actual only uses 4 lens, i.e. biconcave lens 1, first biconvex lens 2, 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 is 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, be the environmental protection glass that the bright glass factory in Chengdu manufactures.
Four lens both side surface of above-mentioned optical system are common sphere, and without the need to special process process such as aspheric surfaces, the center thickness of lens and edge thickness are suitable for, and lens are easy to process.Biconvex lens 3 and concave-convex lens 4 compose cemented doublet, with correcting chromatic aberration.
In order to correct aberration, optical system of the present invention have employed the structure of one group of two compound lens group, by biconvex lens 3 and concave-convex lens 4 glued together, cemented doublet is positive lens, and focal power is just
biconvex lens 3 is positive lens, and focal power is just
concave-convex lens 4 is negative lens, and focal power is negative
lens 3 and 4 parameter meets (1), (2) formula:
Wherein, ν
3, ν
4be respectively the material Abbe number of the second biconvex lens 3 and concave-convex lens 4,
be respectively the focal power of the second biconvex lens 3 and concave-convex lens 4.
(1), (2) formula is the focal power computing formula of the two compound lens group of achromatism.Wherein, ν
3, ν
4be respectively the material Abbe number of the second biconvex lens 3 and concave-convex lens 4.In this fact Example, the second biconvex lens 3 and concave-convex lens 4 adopt two kinds of different optical materials: H-ZK9 and H-ZF52A respectively.H-ZK9(nd=1.62, vd=60.34) refractive index is lower, and Abbe number is higher.H-ZF52A(nd=1.85, vd=23.78) contrary, refractive index is higher, and Abbe number is lower.The difference of the Abbe number of two kinds of optical materials is comparatively large, can correct aberration better.
See Fig. 1, the radius of curvature R 11 of the object space side surface of biconcave lens 1 is greater than the radius of curvature R 12 on its image side surface; The radius of curvature R 21 of the object space side surface of described first biconvex lens 2 is greater than the radius of curvature R 22 on its image side surface; The radius of curvature R 31 of the object space side surface of described pair of compound lens group is greater than the radius of curvature R 32 of its intermediate surface and is less than the radius of curvature R 33 on its image side surface.Concrete data are see table 2.Be understandable that, the invention is not restricted to the concrete numerical value of each radius-of-curvature that table 2 is listed, described curvature can (parameter such as the thickness of the refractive index of such as lens material, Abbe number, lens and distance) be selected as the case may be.
In the optical system of this embodiment, the material of first 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, obvious to correcting chromatic aberration effect.
This optical system all can blur-free imaging under visible spectrum and near infrared spectrum, meets the use of high definition day and night type video camera.
The focal length of the optical system of the present embodiment is 4mm.The aperture diaphragm of optical system is placed between biconcave lens 1 and biconvex lens 2.The work f-number F#<2.5 of optical system.
Table 1 lists the detailed technology feature of the optical system of the present embodiment.Table 2 lists the number of the lens face of title, the from the object side to the image side number consecutively of optical element, the radius-of-curvature of each optical surface, the title material along the distance between each optical surface of optical axis, 4 lens.
Table 1
Table 2
With MTF(modulation transfer function) resolving power of methods analyst camera lens is with contrast rendition ability.The mode measuring MTF is that its unit represents with lp/mm can present many fewer striplines to measure in the scope of a mm.
When Figure 2 shows that this optical system works by day, MTF figure when namely operating spectral range is 430nm to 700nm.Central vision at 160lp/mm place, modulation transfer function >0.4.Peripheral field at 120lp/mm place, MTF>0.3.Optical system of the present invention can meet the sharpness requirement of 2,000,000 video cameras.Shown in figure 4, central vision and peripheral field at low frequency 20lp/mm place, MTF>0.9.The mtf value of low frequency is high, and the permeability of optical system imaging of the present invention is relatively good.
Figure 3 shows that this optical system is when working night, MTF figure when namely operating spectral range is 830nm to 870nm.Central vision at 125lp/mm place, modulation transfer function >0.5.Peripheral field at 120lp/mm place, modulation transfer function >0.3.Shown in figure 5, central vision and peripheral field at low frequency 20lp/mm place, MTF>0.85.
Fig. 6 is the out of focus curve map of camera lens optical system provided by the present invention when working by day.Fig. 7 is the out of focus curve map of camera lens optical system provided by the present invention when night works.Fig. 6 and Fig. 7 contrasts displaying, and when this optical system works with night respectively by day, defocusing amount, all can imaging clearly when effectively ensure that optical system works with night by day within 0.020mm.
Finally it is to be noted: above embodiment only in order to technical scheme of the present invention to be described, is not intended to limit.Although with reference to previous embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein portion of techniques feature; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (10)
1. a camera lens optical system, is characterized in that, comprising:
From biconcave lens (1), the first biconvex lens (2) and two compound lens group that object space to image space arranges in order, wherein, described pair of compound lens group comprises the second biconvex lens (3) and concave-convex lens (4) combined, and described second biconvex lens (3) and concave-convex lens (4) meet (1), (2) formula:
Wherein, ν
3, ν
4be respectively the material Abbe number of the second biconvex lens (3) and concave-convex lens (4),
be respectively the focal power of the second biconvex lens (3) and concave-convex lens (4),
for the focal power of two compound lens group.
2. camera lens optical system as claimed in claim 1, is characterized in that, described second biconvex lens (3) and concave-convex lens (4) glued together.
3. camera lens optical system as claimed in claim 2, it is characterized in that, the both side surface of described biconcave lens (1), the first biconvex lens (2), the second biconvex lens (3) and concave-convex lens (4) is sphere.
4. camera lens optical system as claimed in claim 3, it is characterized in that, the radius-of-curvature (R11) of the object space side surface of described biconcave lens (1) is greater than the radius-of-curvature (R12) on its image side surface; The radius-of-curvature (R21) of the object space side surface of described first biconvex lens (2) is greater than the radius-of-curvature (R22) on its image side surface; The radius-of-curvature (R31) of the object space side surface of described pair of compound lens group is greater than the radius-of-curvature (R32) of its intermediate surface and is less than the radius-of-curvature (R33) on its image side surface.
5. camera lens optical system as claimed in claim 4, is characterized in that, comprise the aperture diaphragm be positioned between described biconcave lens (1) and the first biconvex lens (2) further.
6. camera lens optical system as claimed in claim 1, it is characterized in that, the material Abbe number of described second biconvex lens (3) is different from the material Abbe number of described concave-convex lens (4), and both differences are greater than 25.
7. camera lens optical system as claimed in claim 1, it is characterized in that, the material Abbe number of described second biconvex lens (3) is different from the material Abbe number of described concave-convex lens (4), and both differences are more than or equal to 30, are less than or equal to 50.
8. camera lens optical system as claimed in claim 1, it is characterized in that, the material Abbe number of described biconcave lens (1) is more than or equal to 60, and refractive index is less than 1.5.
9. a video camera, is characterized in that, comprises the camera lens optical system according to any one of claim 1-7.
10. video camera as claimed in claim 9, is characterized in that, described video camera is day and night type video camera.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310330125.6A CN104345427B (en) | 2013-07-30 | 2013-07-30 | Video camera lens optical system and video camera |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310330125.6A CN104345427B (en) | 2013-07-30 | 2013-07-30 | Video camera lens optical system and video camera |
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| CN104345427A true CN104345427A (en) | 2015-02-11 |
| CN104345427B CN104345427B (en) | 2017-02-15 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105182506A (en) * | 2015-10-13 | 2015-12-23 | 福建福光股份有限公司 | Wide-angle lens with 2.6mm fixed focus |
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| JP2001100093A (en) * | 2000-06-13 | 2001-04-13 | Olympus Optical Co Ltd | Relay optical system |
| 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 |
| JP2013120193A (en) * | 2011-12-06 | 2013-06-17 | Konica Minolta Advanced Layers Inc | Imaging lens |
-
2013
- 2013-07-30 CN CN201310330125.6A patent/CN104345427B/en active Active
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| JP2001100093A (en) * | 2000-06-13 | 2001-04-13 | Olympus Optical Co Ltd | Relay optical system |
| 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 |
| JP2013120193A (en) * | 2011-12-06 | 2013-06-17 | Konica Minolta Advanced Layers Inc | Imaging lens |
Non-Patent Citations (1)
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| 屈恩世，杨正，汪岗，曹剑中: "利用二元光学和消色差复合透镜组合校正二级光谱色差", 《光子学报》 * |
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| CN105182506A (en) * | 2015-10-13 | 2015-12-23 | 福建福光股份有限公司 | Wide-angle lens with 2.6mm fixed focus |
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