CN201311519Y - Image pick-up lens and image pick-up device - Google Patents
Image pick-up lens and image pick-up device Download PDFInfo
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- CN201311519Y CN201311519Y CNU2008202107253U CN200820210725U CN201311519Y CN 201311519 Y CN201311519 Y CN 201311519Y CN U2008202107253 U CNU2008202107253 U CN U2008202107253U CN 200820210725 U CN200820210725 U CN 200820210725U CN 201311519 Y CN201311519 Y CN 201311519Y
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Abstract
The utility model provides an image pick-up lens and an image pick-up device. The video making lens can maintain good optical performance in the broad wave bands from the visible range to the near infrared range, and has a long back focal length and a small F value. In addition, the video making lens can be small and can be made with low cost. The video making lens is provided with a negative first lens (L 1), a joint lens (LC) and a lens screen, wherein, the first lens is arranged nearest to the object side and is in the shape of a crescent; the concave surface of the first lens faces to the object side; the joint lens is arranged nearest to the image side; the surface of the joint lens nearest to the object side is a convex surface; and the lens screen is arranged right ahead of the object side of the joint lens. And the image pick-up lens meets the following conditional formulae: (R2 minus R1)/(R1 plus R2) is larger than 0.05 and less than 0.25 (1), and the difference of gamma d1and gamma d2 is larger than 15 (2), wherein, R1 represents the curvature radius of the surface of the object side of the first lens; R2 represents the curvature radius of the surface of the image side of the first lens; gamma d1 represents the Abbe number for the d line of the lens nearest to the object side in the lenses which form the joint lens; and gamma d2 represents the Abbe number for the d line of the lens nearest to the image side in the lenses which form the joint lens.
Description
Technical field
The utility model relates to a kind of imaging lens system and camera head, relates in more detail a kind ofly being suitable at the imaging lens system of uses such as the vehicle mounted camera that uses CCD (Charge Coupled Device) or CMOS imaging apparatuss such as (Complementary Metal OxideSemiconductor), used for mobile terminal camera, monitoring camera and possessing the camera head of this imaging lens system.
Background technology
In recent years, the very miniaturization of imaging apparatus such as CCD or CMOS and high pixelation are developed.Meanwhile, the miniaturization that possesses the picture pick-up device body of these imaging apparatuss is also developed, and the imaging lens system that it carried is also required miniaturization, lightweight.
On the other hand, have the high against weather of summer in the car from the outside weather of cold district to the torrid areas in requirements such as vehicle mounted camera or monitoring cameras, simultaneously, the cheap and high performance lens that can use in wide temperature range.
The flat 11-271610 communique of [patent documentation 1] patent disclosure
The flat 5-224119 communique of [patent documentation 2] patent disclosure
Vehicle mounted camera or monitoring camera are around-the-clock cameras, especially, with regard to the vehicle mounted camera, for the shooting of carrying out visible light daytime and the shooting of carrying out near infrared light evening, so, need with from the viewing area to the corresponding optical system of the wide wave band of near infrared region.In addition, for corresponding to the shooting under low-light (level), need the heavy caliber ratio and be bright optical system.And, consider configuration glass cover or wave filter etc. between lens combination and imaging apparatus, the long optical system of preferred back focal length.
Yet the middle telephoto lens of record has been considered the optical aberration correcting of viewing area in the patent documentation 1,2, but can not guarantee the performance of near infrared region.In addition, the lens of record are that the F value is the dark optical system on 4 right sides in the patent documentation 1, are not suitable for using at night.Record is that the lens number is many lens of 7～8 in the patent documentation 2, so it is large-scale that optical system becomes, remove become expensive, because of having used non-spherical lens, so it is strict that the precision prescribed during installation and processing becomes, the result can make the cost raising.
The utility model content
The utility model is In view of the foregoing, its purpose is, provides a kind of and keeps the good optical performance and have long back focal length and little F value, small-sized and cheap imaging lens system and possess the camera head of this imaging lens system to the wide wave band of near infrared region in the viewing area.
The 1st imaging lens system of the present utility model is characterized in that possessing: the 1st negative lens, and it is configured in the most close object side, and is the meniscus shape of concave surface towards object side; Engage lens, it is configured in by the picture side, and to lean on the face of object side most be convex surface; And diaphragm, it is configured in the dead ahead of the object side of these joint lens, and, satisfy following conditional:
0.05＜(R2-R1)/(R1+R2)＜0.25…(1)
γd1-γd2＞15…(2)
In the formula,
R1: the radius-of-curvature of the face of the object side of the 1st lens
R2: the radius-of-curvature of the face of the picture side of the 1st lens
γ d1: constitute in the lens of joint lens of the most close picture side the Abbe number to the d line of the lens of close object side
γ d2: the Abbe number to the d line of the lens of the most close picture side in the lens of the joint lens of the most close picture side of formation.
Need to prove that " dead ahead " in " at the diaphragm of the dead ahead of the object side that engages lens configuration " is meant engaging between lens and the diaphragm and do not insert other optical parameters herein, rather than span from.
Need to prove, when the 1st lens are non-spherical lens herein, as the paraxial radius-of-curvature of R1, R2 use of conditional (1).
In the 1st imaging lens system of the present utility model, by by the object side configuration with 1st lens of concave surface towards the negative falcate of object side, obtain the optical system that becomes clear that back focal length is long, F value is little easily.Make its formula that satisfies condition (1) by the negative focal power of stipulating the 1st lens, realize the long back focal length and the good revisal of all aberrations easily simultaneously.In addition, in the 1st imaging lens system of the present utility model, disposing the joint lens by the picture side, by stipulating that this engages the dispersion characteristics of the material of lens, make its formula that satisfies condition (2), realize suppressing the good revisal of coma aberration, astigmatic aberration and the multiplying power chromatic aberation on wide wave band easily simultaneously.And, by adopting above-mentioned formation, needn't necessarily use non-spherical lens, just can obtain small-sized and high performance optical system.
At this moment, in the 1st imaging lens system of the present utility model, can all be that the mode of positive lens constitutes according to constituting by lens as the joint lens of side.
The 2nd imaging lens system of the present utility model is characterized in that possessing successively from object side: the 1st negative lens, and it is with the meniscus shape of concave surface towards object side; The 2nd positive lens, its with convex surface towards object side; The 3rd positive lens: it is with the meniscus shape of convex surface towards object side; The 4th negative lens, it is with the meniscus shape of convex surface towards object side; Diaphragm; With the joint lens, it is formed towards the 5th positive lens of object side and the 6th positive lens by convex surface.
In the 2nd imaging lens system of the present utility model, by by the object side configuration with 1st lens of concave surface towards the negative bent moon of object side, obtain the optical system that becomes clear that back focal length is long, F value is little easily.In addition, in the 2nd imaging lens system of the present utility model, by disposing the joint lens by the picture side, as formations such as the above-mentioned shape of suitably setting each lens of the 1st～the 6th lens, focal powers, realize suppressing the good revisal of coma aberration, astigmatic aberration and the multiplying power chromatic aberation on wide wave band easily simultaneously, and, needn't necessarily use non-spherical lens, just can obtain small-sized and high performance optical system.
In the formula, in the of the present utility model the 1st and the 2nd imaging lens system, preferably satisfy following conditional.
0.10＜(R2-R1)/(R1+R2)＜0.20…(1-1)
In the formula,
R1: the radius-of-curvature of the face of the object side of the 1st lens
R2: the radius-of-curvature of the face of the picture side of the 1st lens
In addition, in the of the present utility model the 1st and the 2nd imaging lens system, also can according to by as the absolute value of the radius-of-curvature of each face of the joint lens of side along with constituting towards become big mode as side from object side.
In addition, in the of the present utility model the 1st and the 2nd imaging lens system, the refractive index to the d line of all lens of total system is preferably greater than 1.75, and further, the refractive index to the d line of all lens of total system is preferably greater than 1.8.
In addition, in the of the present utility model the 1st and the 2nd imaging lens system, preferably satisfy following conditional.
γd1-γd2＞20…(2-1)
In the formula,
γ d1: constitute in the lens of joint lens of the most close picture side the Abbe number to the d line of the lens of close object side
γ d2: the Abbe number to the d line of the lens of the most close picture side in the lens of the joint lens of the most close picture side of formation.
Need to prove that each value of above-mentioned conditional is that e line (wavelength 546.07nm) is made as reference wavelength, this instructions just is made as reference wavelength with the e line as not specifying.
Camera head of the present utility model is characterized in that, possesses above-mentioned imaging lens system of the present utility model and will be converted to the imaging apparatus of electric signal by the optical image that this imaging lens system forms.
According to the utility model, because of formations such as the shape of suitably having set each lens, focal powers, so, can be provided at viewing area to the wide wave band of near infrared region and keep the good optical performance and have long back focal length and little F value, small-sized and cheap imaging lens system and possess the camera head of this imaging lens system.
Description of drawings
Fig. 1 is the index path of the related imaging lens system of an embodiment of the present utility model.
Fig. 2 is the sectional view that the lens of the related imaging lens system of expression embodiment of the present utility model 1 constitute.
Fig. 3 is the sectional view that the lens of the related imaging lens system of expression embodiment of the present utility model 2 constitute.
Fig. 4 is the sectional view that the lens of the related imaging lens system of expression embodiment of the present utility model 3 constitute.
Fig. 5 is the sectional view that the lens of the related imaging lens system of expression embodiment of the present utility model 4 constitute.
Fig. 6 is the sectional view that the lens of the related imaging lens system of expression embodiment of the present utility model 5 constitute.
Fig. 7 is the sectional view that the lens of the related imaging lens system of expression embodiment of the present utility model 6 constitute.
Fig. 8 is each aberration diagram of the related imaging lens system of expression embodiment of the present utility model 1.
Fig. 9 is each aberration diagram of the related imaging lens system of expression embodiment of the present utility model 2.
Figure 10 is each aberration diagram of the related imaging lens system of expression embodiment of the present utility model 3.
Figure 11 is each aberration diagram of the related imaging lens system of expression embodiment of the present utility model 4.
Figure 12 is each aberration diagram of the related imaging lens system of expression embodiment of the present utility model 5.
Figure 13 is each aberration diagram of the related imaging lens system of expression embodiment of the present utility model 6.
Figure 14 is the figure of the configuration of the related vehicle mounted camera head of explanation embodiment of the present utility model.
Among the figure: the 1-imaging lens system, the most peripheral light of 2-axial ray, the most peripheral light of the chief ray of 3-off-axis ray, 4-off-axis ray, 5-imaging apparatus, 100-automobile, 101, the outer camera of 102-car, camera in the 103-car, the face interval on the optical axis of i face of Di-and i+1 face, Pim-image space, L1-the 1st lens, L2-the 2nd lens, L3-the 3rd lens, L4-the 4th lens, L5-the 5th lens, L6-the 6th lens, LC-engages lens, the radius-of-curvature of i face of Ri-, the St-aperture diaphragm, the Z-optical axis.
Embodiment
Below, describe embodiment of the present utility model in detail with reference to accompanying drawing.At first, the embodiment of imaging lens system of the present utility model is described, the embodiment of camera head is described then.
Fig. 1 represents the lens profile figure of the imaging lens system 1 that an embodiment of the present utility model is related.Fig. 1 has also represented the most peripheral light 2 of axial ray, the chief ray 3 of off-axis ray, the most peripheral light 4 of off-axis ray in the lump.Need to prove that this configuration example shown in Figure 1 constitutes corresponding to the lens of following embodiment 1 shown in Figure 2.In addition, Fig. 3～Fig. 7 represents the lens profile figure of other configuration examples of the imaging lens system that embodiment of the present utility model is related, and these lens corresponding to following embodiment 2～6 constitute.The imaging lens system of embodiment 1～6, because of basic lens constitute identical, so, below as the related imaging lens system of embodiment of the present utility model, illustrate the imaging lens system 1 of configuration example shown in Figure 1.
Need to prove that the aperture diaphragm St among Fig. 1 does not represent its shape or size and represents its position on optical axis Z.In addition, Fig. 1 considers the situation that is suitable for imaging lens system 1 at camera head, also illustrates the imaging apparatus 5 in the image planes configuration of the image space Pim that comprises imaging lens system.Imaging apparatus 5 is the elements that the optical image that imaging lens system forms are converted to electric signal, for example, is formed by ccd image sensor etc.
Though Fig. 1 does not represent, but when camera head is suitable for imaging lens system 1, preferably be formed between imaging lens system 1 and the imaging apparatus 5 various wave filters such as configuration glass cover or low-pass filter, infrared ray cut off filter, ultraviolet cutoff wave filter according to the phase pusher side that lens are installed.For example, use this imaging lens system at in-vehicle camera, when using the scotopia camera, also can between lens combination and imaging apparatus, insert by wave filter from ultraviolet light to blue light as the night vision subsidy.According to disposing glass cover or wave filter etc. and adjustable when mounted mode so at leisure, imaging lens system 1 becomes the optical system with long back focal length.
In imaging lens system 1, be with the negative lens of concave surface at the 1st lens L1 that disposes by object side towards the meniscus shape of object side, thus, when guaranteeing long back focal length easily, obtain the little bright optical system of F value easily.
0.05＜(R2-R1)/(R1+R2)＜0.25…(1)
At this, R1 is the radius-of-curvature of face of the object side of the 1st lens L1; R2 is the radius-of-curvature of face of the picture side of the 1st lens L1.
Conditional (1) is defined in the proper range of the negative focal power of depending on the 1st lens L1 that object side disposed most.The lower limit that surpasses conditional (1) then is difficult to guarantee long back focal length, is difficult to chromatic aberation, curvature of the image on the revisal axle.The upper limit that surpasses conditional (1) then can't the revisal curvature of the image, the multiplying power chromatic aberation.
0.10＜(R2-R1)/(R1+R2)＜0.20…(1-1)
Further,, be easier to guarantee long back focal length, easily chromatic aberation, curvature of the image, multiplying power chromatic aberation on the revisal axle by the formula of satisfying condition (1-1).
In imaging lens system 1, preferably satisfy following conditional (2) by joint lens LC as side:
γd1-γd2＞15…(2)
Herein, γ d1 is for constituting by the Abbe number to the d line that leans on the lens of object side most in the lens of the joint lens LC of picture side; γ d2 for constitute by in the lens of the joint lens LC of picture side by the Abbe number to the d line of the lens that look like side.
Conditional (2) is defined in by the proper range as the dispersion characteristics of the material of the joint lens that side disposed.By the formula of satisfying condition (2), when suppressing poor, the astigmatic aberration of intelligent image easily, the chromatic aberation of revisal multiplying power well.
γd1-γd2＞20…(2-1)
Further by the formula of satisfying condition (2-1), when suppressing poor, the astigmatic aberration of intelligent image easily, the chromatic aberation of revisal multiplying power well.
In addition, in by the picture joint lens LC of side, preferably according to the absolute value of the radius-of-curvature of each face along with constituting towards become big mode as side from object side, as constitute imaging lens system shown in Figure 11.Constitute by this, when guaranteeing long back focal length, but the balance of chromatic aberation and multiplying power chromatic aberation and keep curvature of the image well on the retainer shaft.
Need to prove, engage lens LC by the face of the object side of the 5th lens L5 of the face of object side be with convex surface when the formation of object side, help optical aberration correcting.
The composition surface of the joint lens LC of imaging lens system 1 shown in Figure 1 has the center of curvature as side.In addition, in the imaging lens system of following embodiment 2～6, with regard to this composition surface, have the center of curvature (symbol of radius-of-curvature just is) as side or when object side has the center of curvature (symbol of radius-of-curvature is for negative), having little curvature.According to such formation, off-axis ray becomes big, the chromatic aberation of revisal multiplying power effectively to the incident angle on composition surface.
In addition, do not increase, in as the little optical system of the F value of this imaging lens system 1, because of the periphery light and the change of composition surface angulation of axial ray are big, so also revisal axle colouring property is poor effectively even engage the curvature on the composition surface of lens LC.
In imaging lens system 1, engaging lens LC is the lens that 2 positive lenss (the 5th lens L5, the 6th lens L6) engage.So, imaging lens system of the present utility model can with by all constituting by positive lens as the joint lens that side disposed.According to such formation, when back focal length increases, help revisal chromatic aberation and curvature of the image.
According to constituting of the joint lens LC that forms by such positive lens, prevent ghost image, also very preferred aspect reducing cost.When supposing to lean on most lens as side to be made as negative lens, total system by the lens face of picture side (below, be called final face) become the big concave surface of curvature, reflect the back once more and accumulate in once more on the imaging apparatus 5 at final face by the light of imaging apparatus 5 reflection, have that to become the strong solar flare of intensity be the possibility of ghost image.To this, in this imaging lens system 1, be made as positive lens by leaning on lens most as side, final face can be made as convex surface or the little concave surface of curvature, can prevent by imaging apparatus 5 reflection and at final face solar flare light high density optically focused on imaging apparatus 5 of secondary reflection again.
The 1st lens L1～the 6th lens L6 that constitutes imaging lens system 1 from object side have successively negative, positive, positive and negative, just, positive power configuration, after amplifying incident beam according to the mode that has long back focal length at the 1st negative lens L1, by positive the 2nd, the 3rd lens L2, L3 slowly with beam convergence, in case obtain after the balance of positive negative aberration by the 4th lens L4, make beam convergence and imaging by positive the 5th, the 6th lens L5, L6.In addition, imaging lens system 1 than biconvex shape or concave-concave shape meniscus shaped lens still less, can reduce the overall aberration generating capacity by the aberration generating capacities of using more, particularly suppresses poor, the astigmatic aberration of intelligent image well, and can guarantee little F value, realizes high optical property.
In addition, by will in abutting connection with the configuration the 3rd lens L3, the 4th lens L4, the 5th lens L5 be made as respectively with convex surface towards the meniscus shape of object side, with convex surface towards the meniscus shape of object side, with the shape of convex surface towards object side, can make the tight at interval weak point of lens and dispose these lens, and help miniaturization.
In the related imaging lens system of present embodiment, the refractive index to the d line that constitutes all lens of total system is preferably greater than 1.75, and further, the refractive index to the d line of these all lens is preferably greater than 1.8.In order to realize miniaturization, preferably each power of lens is big, but when reducing the radius-of-curvature of face in order to strengthen focal power, can be difficult to all aberrations that revisal comprises chromatic aberation.For the radius-of-curvature at face does not reduce and strengthens focal power, also can adopt material as above-mentioned high index of refraction, thus, on one side can suppress all aberrations, Yi Bian seek miniaturization.
Need to prove, for example, when in harsh environment such as vehicle mounted camera, using this imaging lens system, preferably use by the lens of object side configuration anti-anti-because of the surperficial cracking due to the wind and rain, the temperature variation due to the direct sunlight, and, the material of chemicalss such as anti-anti-grease washing agent, that is, and water tolerance, against weather, acid resistance, the contour material of resistance to chemical reagents.
In addition,, preferably use the firm material that is difficult for isolating, particularly, preferably use glass or transparent pottery as leaning on most the lens material of object side configuration.Pottery has the character more high than common strength of glass height, thermotolerance.
For example, when the vehicle mounted camera was suitable for this imaging lens system, requirement can be used in the extraneous air of cold region wide temperature range to the automobile in the summer of torrid areas.When wide temperature range is used, preferably use the little material of linear expansion coefficient as the material of lens.In addition, make lens for cheapness, preferably all lens are spherical lens.
[embodiment]
Next, the concrete numerical value embodiment of the imaging lens system that the utility model is related is described.At first, be that example describes with embodiment 1.Fig. 2 represents the lens pie graph of the imaging lens system that embodiment 1 is related, table 1 expression lens data.
[table 1]
| Si face number | Ri (radius-of-curvature) | Di (face at interval) | Ndj (refractive index) | γ dj (Abbe number) |
| 123456789 (aperture diaphragms) 10 11 12 | -14.460 -20.738 16.639 -2236.506 7.246 12.927 21.777 4.343 ∞ 8.188 22.129 283.412 | 1.80 0.20 3.50 0.20 3.30 0.44 1.45 1.53 0.20 1.73 1.58 5.24 | 1.92286 1.88300 1.88300 1.92286 1.78800 1.80518 | 18.9 40.8 40.8 18.9 47.4 25.4 |
In the lens data of table 1, Si represent to lean on most the face of the inscape of object side be made as the 1st and to the i that increases successively as side (i=1,2,3 ...) individual face number; Ri represent i (i=1,2,3 ...) radius-of-curvature of individual face, Di represent on the optical axis Z of i face and i+1 face face at interval; Ndj represent to lean on most the optical parameter of object side be made as the 1st and towards the j that increases successively as side (j=1,2,3 ...) refractive index to the d line of individual optical parameter, γ dj represents the Abbe number to the d line of j optical parameter.In table 1, radius-of-curvature and face unit at interval is mm, with regard to radius-of-curvature, will just be made as when being protruding at object side, is made as negative when being protruding as side.Need to prove that the lens data of table 1 also comprises has represented aperture diaphragm St.
Fig. 3～Fig. 7 represents the lens pie graph of the imaging lens system that embodiment 2～6 is related respectively, and table 2～table 6 is represented lens data respectively.Need to prove, in Fig. 2～Fig. 7, comprise the imaging apparatus of having represented in the image planes configuration that comprises image space Pim 5 yet, illustrated aperture diaphragm St does not represent its shape or size and represents its position on optical axis Z.In addition, in each embodiment, the Ri in the lens data table, Di (i=1,2,3 ...) corresponding to symbol Ri, the Di of lens pie graph.
[table 2]
Embodiment 2 lens datas
| Si face number | Ri (radius-of-curvature) | Di (face at interval) | Ndj (refractive index) | γ dj (Abbe number) |
| 123456789 (aperture diaphragms) 10 11 12 | -15.088 -20.429 15.901 254.467 7.519 14.423 25.342 4.216 ∞ 7.286 31.341 ∞ | 1.50 0.46 3.50 0.24 4.00 0.29 1.50 1.17 0.20 1.80 3.00 3.72 | 1.92286 1.88300 1.83481 1.92286 1.77250 1.80518 | 18.9 40.8 42.7 18.9 49.6 25.4 |
[table 3]
Embodiment 3 lens datas
| Si face number | Ri (radius-of-curvature) | Di (face at interval) | Ndj (refractive index) | γ dj (Abbe number) |
| 123456789 (aperture diaphragms) 10 11 12 | -14.390 -19.547 20.955 -94.948 7.187 11.067 21.121 4.722 ∞ 8.970 39.943 -155.046 | 2.00 0.20 3.47 0.20 3.40 0.57 1.50 1.55 0.20 1.82 1.56 5.84 | 1.92286 1.83481 1.83481 1.92286 1.80400 1.80518 | 18.9 42.7 42.7 18.9 46.6 25.4 |
[table 4]
Embodiment 4 lens datas
| Si face number | Ri (radius-of-curvature) | Di (face at interval) | Ndj (refractive index) | γ dj (Abbe number) |
| 123456789 (aperture diaphragms) 10 11 12 | -14.452 -18.497 23.017 -112.491 7.312 11.034 19.478 4.867 ∞ 9.356 -775.339 -55.281 | 2.00 0.20 3.29 0.20 3.92 0.49 1.50 1.43 0.20 1.90 1.48 5.74 | 1.92286 1.83481 1.88300 2.14353 1.88300 1.84666 | 18.9 42.7 40.8 17.8 40.8 23.8 |
[table 5]
| Si face number | Ri (radius-of-curvature) | Di (face at interval) | Ndj (refractive index) | γ dj (Abbe number) |
| 123456789 (aperture diaphragms) 10 11 12 | -15.447 -25.086 25.534 -55.373 7.945 15.372 39.098 5.145 ∞ 9.868 -70.224 -88.493 | 2.00 0.20 3.50 0.20 4.16 0.56 1.50 1.45 0.20 1.96 1.39 6.04 | 1.92286 1.88300 1.83400 1.92286 1.88300 1.84666 | 18.9 40.8 37.2 18.9 40.8 23.8 |
[table 6]
Embodiment 6 lens datas
| Si face number | Ri (radius-of-curvature) | Di (face at interval) | Ndj (refractive index) | γ dj (Abbe number) |
| 123456789 (aperture diaphragms) 10 11 12 | -14.477 -16.939 22.052 1226.134 7.458 11.675 21.001 4.939 ∞ 9.483 -108.297 -44.037 | 2.00 0.20 3.07 0.20 4.15 0.47 1.50 1.41 0.20 1.93 1.59 5.74 | 2.14353 1.83481 1.88300 2.14353 1.88300 1.92286 | 17.8 42.7 40.8 17.8 40.8 18.9 |
Various data in table 7 expression embodiment 1～6 imaging lens system.In table 7, focal length is the focal length of total system, f5 is the focal length of the 5th lens L5, f6 is the focal length of the 6th lens L6, (R2-R1)/(R2+R1) be value corresponding to conditional (1), γ d1-γ d2 is the value corresponding to conditional (2), and Ndmin is the minimum value to the refractive index of d line in the lens of total system.In the table 7, the unit of focal length, back focal length, f5, f6 is mm, and the unit at full visual angle is degree.Known to from table 7, embodiment 1～6 formula (1), 2 that all satisfies condition).
| |
Embodiment 2 | Embodiment 3 | Embodiment 4 | |
Embodiment 6 | |
| The full visual angle of focal length F value back focal length f5 f6 (R2-R1)/(R2+R1) γ d1-γ d2 Ndmin | 14.03 1.45 25.68 5.24 15.64 29.73 0.178 22.0 1.78800 | 13.60 1.40 26.43 3.72 11.90 38.92 0.150 24.2 1.77250 | 14.50 1.45 24.89 5.84 14.02 39.59 0.152 21.2 1.80400 | 14.50 1.46 24.88 5.74 10.48 70.24 0.123 17.0 1.83481 | 14.50 1.46 24.90 6.04 9.91 -416.25 0.238 17.0 1.83400 | 14.50 1.46 24.88 5.74 9.95 79.47 0.078 21.9 1.83481 |
[table 7]
Fig. 8～Figure 13 represents the aberration diagram of the spherical aberration of the imaging lens system that the foregoing description 1～6 is related, astigmatic aberration, distortion aberration (distortion aberration), multiplying power chromatic aberation respectively.Though each aberration diagram represents e line (wavelength 546.07nm) is made as the aberration of reference wavelength, also represent the aberration of relevant g line (wavelength 435.83nm), C line (wavelength 656.3nm), s line (wavelength 852.11nm) among spherical aberration diagram and the multiplying power chromatic aberation figure.Distortion aberration chart be shown in the focal distance f of utilizing total system, half angle of view θ (parameter is handled, when 0≤θ≤ω) is made as desirable image height f * tan θ apart from its side-play amount.The Fno. of spherical aberration diagram is the F value, and the ω of other aberration diagrams represents half angle of view.
Known to from above data, the foregoing description 1～6th, the F value is 1.40～1.46 little value, and revisal well whole viewing area each aberration near infrared wide wavelength band zone.In addition, the foregoing description 1～6 has the back focal length of the length that can insert wave filter etc. easily, and constitutes small-sized.Further, the foregoing description 1～6 is because of using aspheric surface, and all is made of spherical lens, so, can cheaply make.So, the imaging lens system of embodiment 1～6 is adapted at being used to take the uses such as vehicle mounted camera of images such as vehicle front, side, rear.
Carry the imaging lens system of present embodiment and the state of camera head as making use-case be illustrated in automobile 100 among Figure 14.In Figure 14, automobile 100 possess the outer camera 101 of car of the dead range that is used to take its codriver's seat side side and be used to take the outer camera 102 of car of the dead range of automobile 100 rear sides, the back side that is installed in rearview mirror is used to take with the car of driver's same field of view scope in camera 103.Outer camera 101 of car and the outer camera 102 of car and Che Nei camera 103 are camera head, possess imaging lens system 1 that embodiment of the present utility model is arranged and the imaging apparatus 5 that the optical image that imaging lens system 1 forms is converted to electric signal.
As above-mentioned, the related imaging lens system 1 of embodiment of the present utility model is because of the wide wave band near infrared region keeps the good optical performance in the viewing area, and has a little F value, constitute small-sized, and can cheaply make, so camera 103 also can be small-sized and cheap formation in outer camera 101,102 of car and the car, and can be at the bright and good picture in the whole viewing area of shooting surface imaging to the wide wavelength band zone of near infrared region of its imaging apparatus 5.
More than, exemplify embodiment and embodiment has illustrated the utility model, but the utility model is not limited to above-mentioned embodiment and embodiment, can be all distortion.For example, the value of the radius-of-curvature of each lens composition, face interval and refractive index can be not limited to the value shown in above-mentioned each numerical value embodiment, desirable other values.
In addition, in the embodiment of camera head, be suitable for example of the present utility model to illustrate, but the utility model is not limited to this purposes at the vehicle mounted camera, for example, also applicable to used for mobile terminal camera or monitoring camera etc.
Claims (9)
1. imaging lens system is characterized in that possessing: the 1st negative lens, and it is configured in by object side, and is the meniscus shape of concave surface towards object side; Engage lens, it is configured in by the picture side, and to lean on the face of object side most be convex surface; And diaphragm, it is configured in the dead ahead of the object side of these joint lens, and, satisfy following conditional:
0.05＜(R2-R1)/(R1+R2)＜0.25 … (1)
γd1-γd2＞15 … (2)
In the formula,
R1: the radius-of-curvature of the face of the object side of the 1st lens
R2: the radius-of-curvature of the face of the picture side of the 1st lens
γ d1: constitute in the lens of above-mentioned joint lens Abbe number to the d line by the lens of object side
γ d2: constitute in the lens of above-mentioned joint lens Abbe number to the d line by the lens of picture side.
2. imaging lens system according to claim 1 is characterized in that, the lens that constitute above-mentioned joint lens all are positive lens.
3. imaging lens system is characterized in that possessing successively from object side: the 1st negative lens, and it is the meniscus shape of concave surface towards object side; The 2nd positive lens, its with convex surface towards object side; The 3rd positive lens: it is the meniscus shape of convex surface towards object side; The 4th negative lens, it is the meniscus shape of convex surface towards object side; Diaphragm; With the joint lens, it is formed towards the 5th positive lens of object side and the 6th positive lens by convex surface.
4. according to each described imaging lens system in the claim 1～3, it is characterized in that, satisfy following conditional:
0.10＜(R2-R1)/(R1+R2)＜0.20 … (1-1)
In the formula,
R1: the radius-of-curvature of the face of the object side of the 1st lens
R2: the radius-of-curvature of the face of the picture side of the 1st lens.
5. according to each described imaging lens system in the claim 1～3, it is characterized in that, in above-mentioned joint lens, according to the absolute value of the radius-of-curvature of each face along with constituting towards become big mode as side from object side.
6. according to each described imaging lens system in the claim 1～3, it is characterized in that, all lens to the refractive index of d line greater than 1.75.
7. according to each described imaging lens system in the claim 1～3, it is characterized in that, all lens to the refractive index of d line greater than 1.8.
8. according to each described imaging lens system in the claim 1～3, it is characterized in that, satisfy following conditional:
γd1-γd2＞20 … (2-1)
In the formula,
γ d1: constitute in the lens of above-mentioned joint lens Abbe number to the d line by the lens of object side
γ d2: constitute in the lens of above-mentioned joint lens Abbe number to the d line by the lens of picture side.
9. camera head is characterized in that possessing:
Each described imaging lens system in the claim 1～3; With
The optical image of this imaging lens system formation is converted to the imaging apparatus of electric signal.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2007328236 | 2007-12-20 | ||
| JP2007328236A JP5015752B2 (en) | 2007-12-20 | 2007-12-20 | Imaging lens and imaging apparatus |
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| CN201311519Y true CN201311519Y (en) | 2009-09-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008202107253U Expired - Lifetime CN201311519Y (en) | 2007-12-20 | 2008-10-06 | Image pick-up lens and image pick-up device |
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| Country | Link |
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| JP (1) | JP5015752B2 (en) |
| CN (1) | CN201311519Y (en) |
| TW (1) | TWM359699U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103676084A (en) * | 2012-09-04 | 2014-03-26 | 大立光电股份有限公司 | Single focus camera lens group |
| CN109445064A (en) * | 2018-09-28 | 2019-03-08 | 玉晶光电(厦门)有限公司 | Optical imaging lens |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5320163B2 (en) | 2009-05-26 | 2013-10-23 | 富士フイルム株式会社 | Imaging lens and imaging apparatus |
| CN105143946B (en) * | 2013-03-26 | 2017-07-04 | 富士胶片株式会社 | Imaging lens system and camera head |
| TWI611208B (en) | 2016-06-04 | 2018-01-11 | 大立光電股份有限公司 | Photographing optical lens system, image capturing apparatus and electronic device |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4156828B2 (en) * | 2001-11-27 | 2008-09-24 | オリンパス株式会社 | Macro lens and camera equipped with the same |
| JP2006053377A (en) * | 2004-08-12 | 2006-02-23 | Fujinon Corp | Telephoto lens |
-
2007
- 2007-12-20 JP JP2007328236A patent/JP5015752B2/en active Active
-
2008
- 2008-10-06 CN CNU2008202107253U patent/CN201311519Y/en not_active Expired - Lifetime
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103676084A (en) * | 2012-09-04 | 2014-03-26 | 大立光电股份有限公司 | Single focus camera lens group |
| CN103676084B (en) * | 2012-09-04 | 2015-09-09 | 大立光电股份有限公司 | Single focus camera lens group |
| CN109445064A (en) * | 2018-09-28 | 2019-03-08 | 玉晶光电(厦门)有限公司 | Optical imaging lens |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2009151046A (en) | 2009-07-09 |
| TWM359699U (en) | 2009-06-21 |
| JP5015752B2 (en) | 2012-08-29 |
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Effective date of registration: 20181018 Address after: Tokyo, Japan Patentee after: FUJIFILM Corp. Address before: Japan's Saitama Prefecture Patentee before: Fujinon Corp. |