CN101339288B - Imaging lens and imaging device - Google Patents
Imaging lens and imaging device Download PDFInfo
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- CN101339288B CN101339288B CN2008101282349A CN200810128234A CN101339288B CN 101339288 B CN101339288 B CN 101339288B CN 2008101282349 A CN2008101282349 A CN 2008101282349A CN 200810128234 A CN200810128234 A CN 200810128234A CN 101339288 B CN101339288 B CN 101339288B
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- 238000006731 degradation reaction Methods 0.000 description 9
- 230000007246 mechanism Effects 0.000 description 7
- 230000005499 meniscus Effects 0.000 description 4
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Abstract
The invention provides an imaging lens having satisfactory optical performances and being reduced in size and cost. The imaging lens includes in order from an object side, a negative first lens L1, a negative second lens L2, a positive third lens L3, a stop, a positive fourth lens L4 and a negative fifth lens L5. And the focal length f3 of the third lens L3 at d-line, the focal length f of the whole system at d-line, Abbe number gama3 at d-line of the third lens L3 satisfy 3.0 < f3/f < 4.5.
Description
Technical field
The present invention relates to a kind of imaging lens system and camera head, in particular to the imaging lens system that is applicable to 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 etc. and possess the camera head of this imaging lens system.
Background technology
The miniaturization of the imaging apparatus of CCD or CMOS etc. and high pixelation are in develop rapidly in recent years, meanwhile, possess the also development to some extent of miniaturization of the picture pick-up device body of those imaging apparatuss, the imaging lens system that carries at the picture pick-up device body is also required miniaturization, lightweight.
On the other hand,, require outer gas from cold district in the car in tropicopolitan summer, both had high-weatherability, again the high performance lens of the small-sized and wide-angle that can in temperature range widely, use at vehicle mounted camera or monitoring camera etc.
As the imaging lens system in above-mentioned field, the applicant number proposes to seek 6 formations of small-sized and wide-angle, the imaging lens system of 7 formations patented claim 2007-11288 number, patented claim 2007-74322.And, as the imaging lens system in known above-mentioned field in the past, following patent documentation 1～3 described imaging lens system is arranged.At patent documentation 1, record the wide-angle lens of 6 formations of the 1st, the 2nd lens with negative meniscus shape.At patent documentation 2, record and have the 1st, the 2nd negative lens, at the imaging lens system of 5 formations of the more close picture side place configuration aperture of the lens of the most close picture side.And, at patent documentation 3, record the wide-angle lens of 5 formations that are used for photographic system.
No. 7023628 instructions of [patent documentation 1] United States Patent (USP)
No. the 3672278th, [patent documentation 2] patent gazette
No. 4525038 instructions of [patent documentation 3] United States Patent (USP)
Summary of the invention
Yet, in recent years, not only require further miniaturization, also require cost degradation, for the imaging lens system of above-mentioned 6,7 formations, require to reduce the lens number.The lens that patent documentation 2 is put down in writing are 5 formations, but aperture position is bordering on image planes, so the light height of the lens of close object side uprises, makes the big footpathization of lens.Especially, at the vehicle mounted camera, be preferably lens face in appearance to expose area less.For this reason, be preferably path.
The present invention is in view of foregoing, and its purpose is, a kind of maintenance favorable optical performance is provided, and can seek the imaging lens system of miniaturization and cost degradation and possess the camera head of this imaging lens system.
Imaging lens system of the present invention is characterised in that, constitutes the focal distance f of above-mentioned the 3rd lens by the 1st negative lens, negative the 2nd lens, positive the 3rd lens, aperture, the 4th positive lens, the 5th negative lens successively from object side
3, total system focal distance f satisfy following conditional (1):
3.0＜f
3/f＜4.5…(1)。
The 1st imaging lens system of the present invention of above-mentioned formation, lens combination in minimum as a whole 5 simple formation, because of the formation of the suitably configuration of selective light magnification or each lens, and aperture position, so can keep the good optical performance, and can obtain helping the performance of miniaturization and cost degradation.Especially, aperture position is configured between the 3rd lens and the 4th lens, thus the effective diameter of the lens of object side can be dwindled, and help miniaturization.And the printing opacity formula (1) that satisfies condition can be proofreaied and correct filed curvature well.
In addition, in the imaging lens system of the invention described above, the Abbe number υ to the d line of preferred above-mentioned the 3rd lens
3Satisfy following conditional (2):
υ
3＜45…(2)。
The present invention's the 2nd lens constitute the Abbe number υ to the d line of above-mentioned the 3rd lens by the 1st negative lens, negative the 2nd lens, positive the 3rd lens, diaphragm, the 4th positive lens, the 5th negative lens successively from object side
3Satisfy following conditional (2-2):
υ
3＜31…(2-2)。
The 2nd imaging lens system of the present invention of above-mentioned formation is as a whole in minimum 5 pieces simple formation lens combination, formation and stop position by the configuration of selective light magnification suitably and each lens, the good optical performance can be kept, and the performance that helps miniaturization and cost degradation can be accessed.Particularly, by with aperture (diaphragm) position configuration between the 3rd lens and the 4th lens, the effective diameter (directly) of the lens of object side is reduced, and useful to miniaturization.In addition, by the formula of satisfying condition (2-2), can proofread and correct the multiplying power chromatic aberation well.
In addition, in above-mentioned the 1st and the 2nd imaging lens system of avoiding, the axle of above-mentioned the 2nd lens and above-mentioned the 3rd lens is gone up interval D
4, above-mentioned the 3rd lens axle go up thickness D
5, total system focal distance f satisfy following conditional (3).
2.5＜(D
4+D
5)/f＜5.5…(3)
At the imaging lens system of the invention described above, also can engage above-mentioned the 4th lens and above-mentioned the 5th lens and constitute.
And, in the imaging lens system of the invention described above, the refractive index N to the d line of preferred above-mentioned the 4th lens
4And Abbe number υ
4, above-mentioned the 5th lens the refractive index N to the d line
5And Abbe number υ
5Satisfy following conditional (4), (5).
0.05＜N
5-N
4＜0.40…(4)
1.5＜υ
4/υ
5…(5)
And in the imaging lens system of the invention described above, the focal distance f of preferred total system, the distance L on from the face of the object side of above-mentioned the 1st lens to the optical axis of image planes satisfy following conditional (6).
7＜L/f＜14…(6)
Herein, when calculating L, to the distance (back focal length) from the face of the picture side of the 5th lens to image planes, the distance of using air to convert.
In addition, each value of above-mentioned conditional (1)～(6) is the value with respect to reference wavelength, even for other formulas in this instructions, unless otherwise specified, is the value with respect to reference wavelength.
Camera head of the present invention is characterized in that, possesses: the imaging lens system of above-mentioned record and will be transformed into the imaging apparatus of electric signal by the optical image that this imaging lens system forms.
According to the 1st imaging lens system of the present invention, a kind of minimum 5 so few lens numbers that are can be provided, and by suitably setting the formation and aperture (diaphragm) position of each lens such as refracting power, constitute by constituting the formula of satisfying condition (2-2), the good optical performance can be guaranteed, miniaturization and cost degradation can not be sought.
According to the 2nd camera head of the present invention, be minimum 5 pieces of less piece of such numbers, and suitably set the formation or the location of aperture of each lens such as refracting power, and constitute in the mode of the formula of satisfying condition (2-2), thereby can guarantee the good optical performance, and can seek miniaturization and cost degradation.
Camera head of the present invention has the of the present invention the 1st or the 2nd imaging lens system, therefore can access good picture, and can be with small-sized and low-cost formation.
Description of drawings
Fig. 1 is the index path of the related imaging lens system of one embodiment of the present invention.
Fig. 2 is the sectional view that the lens of the related imaging lens system of expression embodiments of the invention 1 constitute
Fig. 3 is the sectional view that the lens of the related imaging lens system of expression embodiments of the invention 2 constitute.
Fig. 4 is the sectional view that the lens of the related imaging lens system of expression embodiments of the invention 3 constitute.
Fig. 5 is the sectional view that the lens of the related imaging lens system of expression embodiments of the invention 4 constitute.
Fig. 6 is the sectional view that the lens of the related imaging lens system of expression embodiments of the invention 5 constitute.
Fig. 7 is each aberration diagram of the related imaging lens system of embodiments of the invention 1.
Fig. 8 is each aberration diagram of the related imaging lens system of embodiments of the invention 2.
Fig. 9 is each aberration diagram of the related imaging lens system of embodiments of the invention 3.
Figure 10 is each aberration diagram of the related imaging lens system of embodiments of the invention 4.
Figure 11 is each aberration diagram of the related imaging lens system of embodiments of the invention 5.
Figure 12 is the figure of the configuration of the vehicle mounted camera head that is used to illustrate that embodiments of the present invention are related.
Among the figure: 1-imaging lens system, 2-axle glazed thread, 3-off-axis ray, 4-imaging apparatus, 11,12-chopping mechanism, 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, Im-image space, L1-the 1st lens, L2-the 2nd lens, L3-the 3rd lens, L4-the 4th lens, L5-the 5th lens, PP-optics, the radius-of-curvature of i face of Ri-, St-aperture diaphragm, Z-optical axis.
Embodiment
Below, embodiments of the present invention are elaborated with reference to accompanying drawing.At first, the present embodiment of imaging lens system of the present invention is described, thereafter, the embodiment of camera head is described with reference to Fig. 1.
The lens profile figure that represents the related imaging lens system of one embodiment of the present invention 1 at Fig. 1.In addition, configuration example shown in Figure 1 constitutes corresponding to the lens of following embodiment 1.Fig. 1 also together expression a glazed thread 2 is arranged and with the off-axis ray 3 of maximum visual angle incident.
In addition, at Fig. 1, when considering that imaging lens system 1 is applicable to camera head, also illustrate the imaging apparatus 4 that is configured in the image planes that the image space Im to imaging lens system 1 comprises.Imaging apparatus 4 will be transformed into electric signal by the optical image that imaging lens system 1 forms, and for example, be formed by CCD image sensor etc.
And, when being applicable to camera head,, preferably between the 5th lens L5 and image planes, disposing cloche, low-pass filter or infrared ray cut and consider mating plate etc. according to the formation of the phase pusher side of loading lens.In Fig. 1, expression has configuration to imagine the example of those parallel flat shape optics PP.For example, imaging lens system 1 is being used for in-vehicle camera (カ メ ラ), and under the situation about using as the scotopia camera of the auxiliary usefulness of the vision at night, also can, between lens combination and imaging apparatus 4, insert light filter to from the ultraviolet light to the blue light, ending.
In addition, also can replace between lens combination and imaging apparatus 4 the configuration low-pass filter and various wave filters that the wave band of regulation is ended etc., and between each lens these various wave filters of configuration.Perhaps, on the transparent area of one of them lens that imaging lens system 1 is had, enforcement has the plated film with various wave filter same functions.
As shown in Figure 1, imaging lens system 1 with present embodiment of negative, negative, positive, positive and negative light amplification rate configuration, be made into and roughly can be considered anti-long distance (レ ト ロ Off オ one カ ス) type, in the time of desirable thus long back focal length, half angle of view can be taken as the lens of the wide viewing angle about 80 degree.
And imaging lens system 1 disposes aperture diaphragm St between the 3rd lens L3 and the 4th lens L4, thus, can reduce the light height of object side lens.In the lens that the patent documentation 2 of the lens number identical with present embodiment is put down in writing, because of the 5th lens dispose aperture diaphragm (diaphragm) as side, so the light height of object side lens uprises.Thus, make comparisons with the lens that patent documentation 2 is put down in writing, the imaging lens system 1 of present embodiment can dwindle the effective diameter degree of object side lens, therefore, can seek more miniaturization, lightweight, cost degradation.
When imaging lens system 1 was applicable to the vehicle mounted camera, it was little to be preferably the lens section that exposes in appearance, and, in the camera in being arranged at car, be preferably the visual field of extremely not covering the driver, from those aspects, it is little to be preferably radial direction.
Herein, the imaging lens system 1 of present embodiment constitutes, the focal distance f of the 3rd lens L3
3Satisfy following conditional (1) with the focal distance f of total system.
3.0＜f
3/f＜4.5…(1)
If surpass the upper limit of conditional (1), the light amplification rate of the 3rd lens L3 (パ ワ one) dies down, and is difficult to proofread and correct well filed curvature (image planes gulf song).If exceed the lower limit of conditional (1), then be difficult to increase back focal length (バ
StarNetwork Off オ one カ ス), the sensitivity relevant with the off-centre of the 3rd lens L3 uprises, and is difficult to assembling.
In addition, in imaging lens system 1,, preferably further satisfy following conditional (1-1) in order to proofread and correct filed curvature more well.
3.0＜f
3/f＜4.2…(1-1)
And, in imaging lens system 1, the Abbe number υ of preferred the 3rd lens L3 to the d line
3Satisfy following conditional (2).
ν
3＜45…(2)
By selecting material in the mode of the formula of satisfying condition (2), the chromatic aberation of correcting colour aberration, especially multiplying power well.
Further proofread and correct well for the chromatic aberation to multiplying power, be preferably, the 3rd lens L3 is with respect to the Abbe number υ of d line
3Satisfy following conditional (2-2).
υ
3＜31…(2-2)
In order the multiplying power chromatic aberation to be suppressed be irreducible minimum, the Abbe number υ of the 3rd lens L3 with respect to the d line
3Satisfy following conditional (2-3):
υ
3＜28…(2-3)。
And in imaging lens system 1, the axle of preferred the 2nd lens L2 and the 3rd lens L3 is gone up interval D
4, the 3rd lens L3 axle go up thickness D
5, total system focal distance f, satisfy following conditional (3):
2.5＜(D
4+D
5)/f＜5.5…(3)。
By making the formula (3) that satisfies condition constitute, well correcting spherical aberration, distort aberration, coma aberration, and can obtain good performance.Further, can make back focal length elongated, and can increase the visual angle.
If surpass the upper limit of conditional (3), then elongated from the distance of aperture diaphragm St to the 1 lens L1, because of the light height that sees through the 1st lens L1 uprises,, opposite with miniaturization so the diameter of the 1st lens L1 (directly) change is big.And, because of the total length of lens combination also elongated, so be difficult to miniaturization.
If exceed the lower limit of conditional (3), then correcting spherical aberration and coma aberration well.And the focal length of total system is elongated, is difficult to obtain the little bright optical system of F value.
And, in imaging lens system 1, the refractive index N of the 4th lens L4 to the d line
4And Abbe number υ
4, the 5th lens L5 the refractive index N to the d line
5And Abbe number υ
5Satisfy following conditional (4), (5).
0.05＜N
5-N
4＜0.40…(4)
1.5＜ν
4/ν
5…(5)。
If surpass the upper limit of conditional (4), then practical spendable material is restricted, and, because of spendable material becomes high price, so hinder cost degradation.If exceed the lower limit of conditional (4), then the absolute value of the radius-of-curvature on composition surface diminishes, and is difficult to processing.
If exceed the lower limit of conditional (5), then be difficult to well chromatic aberation and multiplying power chromatic aberation on the axis calibration.
And, in imaging lens system 1, the focal distance f of preferred total system, satisfy following conditional (6) to the distance L on the optical axis of image planes from the face of the object side of above-mentioned the 1st lens L1.
7＜L/f＜14…(6)
Conditional (6) is in order to reach the formula of miniaturization and wide viewing angleization simultaneously.If surpass the upper limit of conditional (6), then can reach wide viewing angleization easily, but lens combination become maximization.If surpass the lower limit of conditional (6), then can make the lens combination miniaturization, but be difficult to wide viewing angleization.
And, in imaging lens system 1, the focal distance f of preferred total system and the center thickness D of the 1st lens L1
1, satisfy following conditional (7):
0.50＜D
1/f…(7)。
For example, when imaging lens system 1 is used in purposes such as vehicle-mounted, require intensity to various impacts at the 1st lens L1.If surpass the lower limit of conditional (7), then the 1st lens L1 attenuation and easily breaking is to the weakened of various impacts.
And in imaging lens system 1, the focal distance f of preferred total system is with the synthetic focal distance f of the 4th lens L4 and the 5th lens L5
45Satisfy following conditional (8):
2.0＜f
45/f＜5.0…(8)。
If exceed the upper limit of conditional (8), then the synthetic refracting power of the 4th lens L4 and the 5th lens L5 dies down, and is difficult to correcting colour aberration well.If surpass the lower limit of conditional (8), then be difficult to proofread and correct well filed curvature.
And, in the imaging lens system 1 of configuration example shown in Figure 1, the 1st lens L1 is by the negative meniscus shaped lens of convex surface towards object side formed, thus, can catch the light of big incident angle at the convex surface of the object side of the 1st lens L1, can be with the optical system wide viewing angleization, and the light beam after the 1st lens L1 can being penetrated attenuates, and can realize miniaturization.And, be all negative meniscus shaped lens by making the 1st lens L1, the 2nd lens L2, thus not only can reduce Petzval and, and filed curvature is proofreaied and correct in can be across wider picture full field.
And, imaging lens system 1, configuration example as shown in Figure 1, the 3rd lens L3 is preferably the simple lens of biconvex shape, at this moment, can proofread and correct filed curvature well.
And, the 3rd lens L3, as the configuration example of Fig. 1, the absolute value of radius-of-curvature of face that preferably makes object side at this moment, can be proofreaied and correct filed curvature all the more more well less than the absolute value of radius-of-curvature of the face of picture side.
And, at imaging lens system 1,, thus, can proofread and correct upward chromatic aberation of multiplying power chromatic aberation and axle well at the 4th lens L4 and the 5th negative lens L5 more positive than the configuration of the more close picture side of aperture diaphragm St place.Especially, configuration example as shown in Figure 1 makes the 4th lens L4 be made as the biconvex shape, and the 5th lens L5 is made as meniscus shape, thus correcting colour aberration more well.
In addition, in imaging lens system shown in Figure 11, the 4th lens L4 and the 5th lens L5 do not engage, but shown in the embodiment described as follows 2～5, also can be with these as the formation that engages.By engaging, can be easily with axle on chromatic aberation proofread and correct the multiplying power chromatic aberation in the lump well, simultaneously, can shorten the total length of the lens system of optical axis direction, and help miniaturization.
In imaging lens system 1 as constituted above, owing to can increase F value, so be suitable for the photography of animation.And, the imaging lens system 1 of present embodiment, as shown in Figure 1, Application g has the telecentric iris higher than patent documentation 3 described lens (テ レ セ Application ト リ
StarNetwork) therefore property, compared with patent documentation 3 described lens, is more suitable in the photography of having used solid-state imager.
In addition, the 1st lens L1 is the lens of close object side, therefore, when for example being used in the rugged environment of vehicle mounted camera etc., preferred use is anti-in the surface deterioration that is caused by wind and rain and the temperature variation that is caused by direct sunlight, more anti-in the strong material of chemicalss such as grease washing, i.e. higher materials such as water tolerance, against weather, antioxygen, resistance to chemical reagents.And, preferably use the material of firm and difficult fragmentation as the material of the 1st lens L1, concrete preferred glass or the transparent pottery of using.Pottery has and general glassy phase specific strength height, the character that thermotolerance is high.
In imaging lens system 1, become parasitic light by the outer light beam of the effective diameter (directly) between the 1st lens L1 and the 2nd lens L2 and arrive image planes, and the worry that becomes ghost image is arranged.The worry that becomes ghost image by the light beam than 3 more laterals of the light beam among Fig. 1 is arranged, therefore, preferably between the 1st lens L1 and the 2nd lens L2, chopping mechanism 11 is set and the blocking parasitic light.As this chopping mechanism 11, for example the part outside the effective diameter (directly) of the picture side of the 1st lens L1 is implemented opaque coating, also opaque sheet material can be set.Perhaps, also can be used as chopping mechanism and opaque sheet material is set in the light path that becomes the parasitic light light beam.The chopping mechanism of this purpose, not only between the 1st lens L1 and the 2nd lens L2, also configurablely as required between other lenses, represent, as the part outside the effective diameter of side example with the chopping mechanism 11 same chopping mechanisms 12 that constitute is set also at the 2nd lens L2 at Fig. 1.
[embodiment]
Then, the concrete numerical value embodiment to imaging lens system involved in the present invention 1 describes.
＜embodiment 1 〉
Lens data and various data at the related imaging lens system of table 1 expression embodiment 1.At the lens data of table 1, the face number represents that with the face of the inscape of close object side be the 1st, and according to towards the i that encloses symbol as side increase mode successively (i=1,2,3 ...) the face number.In addition, also comprise aperture diaphragm (aperture diaphragm) St and optics PP at the lens data of table 1 and enclose symbol.
The Ri of table 1 represents i (i=1,2,3 ...) radius-of-curvature of face, Di represents i (i=1,2,3 ...) on the optical axis Z of face and i+1 face face at interval.And Ndj represents that with the optical parameter of close object side be the 1st, and according to towards the j that increases successively as side (j=1,2,3 ...) refractive index for the d line of optical parameter, vdj represents the Abbe number to the d line of j optical parameter.At table 1, radius-of-curvature and face unit at interval is mm, for radius-of-curvature, convex surface during towards object side for just, and convex surface during towards the picture side for bearing.
Various data at table 1, FNo. be that half angle of view, IH are that image height, Bf are the back focal length that air converts for F value, ω, L is the distance (amount of back focal length is that air converts) on from the face of the object side of the 1st lens L1 of total system to the optical axis Z of image planes, and f is focal length, the f of total system
1Be focal length, the f of the 1st lens L1
2Be focal length, the f of the 2nd lens L2
3Be focal length, the f of the 3rd lens L3
4Be the focal length of the 4th lens L4, f
5Be focal length, the f of the 5th lens L5
45It is the synthetic focal length of the 4th lens L4 and the 5th lens L5.Various data in table 1, the unit of ω is degree, the unit beyond FNo. and the ω all is mm.In addition, the implication of the mark in the table 1 is also identical to following embodiment.
[table 1]
＜embodiment 1 〉
The various data of lens data
The lens pie graph of representing embodiment 1 at Fig. 2.At symbol Ri, the Di of Fig. 2 (i=1,2,3 ...) corresponding to Ri, the Di of table 1.The symbol of Fig. 2 also comprises aperture diaphragm St and optics PP and adds.In addition, not expression shape or size at the aperture diaphragm St of Fig. 2, but the position on the expression optical axis Z.
The imaging lens system of embodiment 1 shown in Figure 2 is 5 groups of 5 formations, but the imaging lens system of the embodiment 2～5 of the following stated has 4 groups of 5 formations of the 4th lens L4 and the 5th lens L5 joint.
＜embodiment 2 〉
In the lens data and the various data of the related imaging lens system of table 2 expression embodiment 2, represent the lens pie graph at Fig. 3.At Fig. 3, symbol Ri, Di are corresponding to Ri, the Di of table 2.
[table 2]
＜embodiment 2 〉
The various data of lens data
＜embodiment 3 〉
In the lens data and the various data of the related imaging lens system of table 3 expression embodiment 3, and represent the lens pie graph at Fig. 4.At Fig. 4, symbol Ri, Di are corresponding to Ri, the Di of table 3.
[table 3]
＜embodiment 3 〉
The various data of lens data
＜embodiment 4 〉
The lens data and the various data of the imaging lens system that table 4 expression embodiment 4 is related, and represent the lens pie graph at Fig. 5.At Fig. 5, symbol Ri, Di are corresponding to Ri, the Di of table 4.
[table 4]
＜embodiment 4 〉
The various data of lens data
＜embodiment 5 〉
The lens data and the various data of the imaging lens system that table 5 expression embodiment 5 is related, and represent the lens pie graph at Fig. 6.At Fig. 6, symbol Ri, Di are corresponding to Ri, the Di of table 5.
[table 5]
＜embodiment 5 〉
The various data of lens data
Table 6 expression is corresponding to the value of conditional (1)～(8) of the imaging lens system of embodiment 1～5.Each value of table 6 is corresponding to d line (wavelength 587.6nm).Can learn the formula that satisfies condition fully (1), (1-1), (2), (3), (4), (5), (6), (7), (8) from table 6.In addition, embodiment 1,4,5 formula (2-2) that satisfies condition, embodiment 1 formula (2-3) that also satisfies condition.
[table 6]
| Conditional | ? | |
|
Embodiment 3 | |
Embodiment 5 |
| (1)? | f 3/f? | 4.00? | 3.40? | 3.97? | 3.42? | 3.72? |
| (2)? | ν 3 | 23.8? | 40.9? | 42.7? | 29.8? | 29.8? |
| (3)? | (D 4+D 5)/f | 2.62? | 4.29? | 4.56? | 4.06? | 5.41? |
| (4)? | N 5-N 4 | 0.11? | 0.21? | 0.21? | 0.21? | 0.21? |
| (5)? | ν 4/ν 5 | 2.47? | 2.85? | 2.85? | 2.85? | 2.85? |
| (6)? | L/f? | 10.42? | 11.83? | 11.64? | 10.89? | 11.67? |
| (7)? | D 1/f? | 0.57? | 0.74? | 0.56? | 0.68? | 0.67? |
| (8)? | f 45/f? | 2.63? | 3.60? | 3.60? | 3.83? | 4.45? |
Represent spherical aberration, astigmatism, the distortion (distortion aberration) of the imaging lens system that the foregoing description 1～5 is related, the aberration diagram of multiplying power chromatic aberation respectively at Fig. 7～Figure 11.At each aberration diagram, expression is the aberration of reference wavelength with the d line, but at spherical aberration diagram and multiplying power chromatic aberation figure, also represents the aberration for F line (wavelength 486.1nm), C line (wavelength 656.3nm).The figure of distortion, use the system-wide focal distance f of lens, half angle of view θ (as variable, 0≤θ≤ω), and desirable image height is made as f * tan θ, and expression is with respect to this side-play amount.The longitudinal axis FNo. of spherical aberration diagram is the F value, and the longitudinal axis ω of other aberration diagram represents half angle of view.From Fig. 7～Figure 11 as can be known, the foregoing description 1～embodiment 5 guarantees little F value, and has proofreaied and correct each aberration well.
Such from what Fig. 7～Figure 11 understood, the foregoing description 1～5 is that the F value is 2.0 bright optical system, and owing to proofreaied and correct each aberration well, therefore can perform well in the shooting of animation.Relative therewith, though the lens of record are 5 pieces of formations in the patent documentation 3, for F value be 4.0 than half-light system, so can not say and be applicable to cartoon photographic.
Above-mentioned imaging lens system 1 and the imaging lens system of embodiment 1～5, be the wide-angle before and after half angle of view 80 degree, and has the good optical performance, and can realize miniaturization and cost degradation, therefore, vehicle mounted camera of photographing etc. applicable to the image that is used for the place ahead, side, rear etc. to automobile.
As making use-case, Figure 12 is illustrated in automobile 100 and loads the imaging lens system of present embodiment and the situation of camera head.At Figure 12, automobile 100, possess: the outer camera 101 of the car of the dead range of the side of its codriver's seat side that is used to make a video recording, the outer camera 102 of car of the dead range of the rear side of the automobile 100 that is used to photograph, and be installed on Room Mirror the back side, be used to photograph with the driver with camera 103 in the car of field range.Outer camera 102 of outer camera 101 of car and car and Che Nei camera 103 are camera head, possess by the imaging lens system 1 of embodiments of the present invention and will be converted to the imaging apparatus 4 of electric signal by imaging lens system 1 formed optical image.
As above-mentioned, the imaging lens system 1 that embodiments of the present invention are related is though be wide-angle, but it is small-sized and have a good optical performance, therefore, camera 103 in outer camera 101,102 of car and the car also can be constituted small-sized, can be at the shooting face of its imaging apparatus 4 with the good picture of wide viewing angle imaging.And, because imaging lens system 1 is small-sized and the lens number is few, therefore, can cheaply make, thereby, also can be with camera 103 cheap manufacturings in outer camera 101,102 of car and the car.
More than, enumerate embodiment and embodiment and understand the present invention, but the invention is not restricted to above-mentioned embodiment and embodiment, can allly be out of shape.For example, the radius-of-curvature of each lens composition, face at interval and the value of refractive index be not limited in the value shown in above-mentioned each numerical value embodiment desirable other value.
And, in the embodiment of camera head, figure is applicable to that the illustration of vehicle mounted camera shows is illustrated, but the invention is not restricted to this purposes, for example also applicable to used for mobile terminal camera or monitoring camera etc.
Claims (8)
1. an imaging lens system is characterized in that,
Constitute by the 1st negative lens, negative the 2nd lens, positive the 3rd lens, diaphragm, the 4th positive lens, the 5th negative lens successively from object side,
The focal distance f of above-mentioned the 3rd lens
3Satisfy following conditional (1) with the focal distance f of total system:
3.0＜f
3/f＜4.5…(1)。
2. imaging lens system according to claim 1 is characterized in that,
The Abbe number υ to the d line of above-mentioned the 3rd lens
3Satisfy following conditional (2):
υ
3＜45…(2)。
3. an imaging lens system is characterized in that,
Constitute by the 1st negative lens, negative the 2nd lens, positive the 3rd lens, diaphragm, the 4th positive lens, the 5th negative lens successively from object side,
The Abbe number υ to the d line of above-mentioned the 3rd lens
3Satisfy following conditional (2-2):
υ
3＜31…(2-2)。
4. according to claim 1 or 3 described imaging lens systems, it is characterized in that,
The axle of above-mentioned the 2nd lens and above-mentioned the 3rd lens is gone up interval D
4, the thickness D on the axle of above-mentioned the 3rd lens
5, and the focal distance f of total system satisfies following conditional (3):
2.5＜(D
4+D
5)/f＜5.5…(3)。
5. according to claim 1 or 3 described imaging lens systems, it is characterized in that,
Above-mentioned the 4th lens and above-mentioned the 5th lens are engaged.
6. according to each described imaging lens system in the claim 1～3, it is characterized in that,
The refractive index N to the d line of above-mentioned the 4th lens
4And Abbe number υ
4, above-mentioned the 5th lens the refractive index N to the d line
5And Abbe number υ
5Satisfy following conditional (4), (5):
0.05＜N
5-N
4＜0.40…(4)
1.5＜υ
4/υ
5…(5)。
7. according to each described imaging lens system in the claim 1～3, it is characterized in that,
The focal distance f of total system, satisfy following conditional (6) to the distance L on the optical axis of image planes from the face of the object side of above-mentioned the 1st lens:
7＜L/f＜14…(6)。
8. a camera head is characterized in that,
Possess:
Each described imaging lens system in the claim 1～3; And
To be transformed into the imaging apparatus of electric signal by the optical image that this imaging lens system forms.
Applications Claiming Priority (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2007176947 | 2007-07-05 | ||
| JP2007-176947 | 2007-07-05 | ||
| JP2007176947 | 2007-07-05 | ||
| JP2008144372 | 2008-06-02 | ||
| JP2008-144372 | 2008-06-02 | ||
| JP2008144372A JP5065159B2 (en) | 2007-07-05 | 2008-06-02 | Imaging lens and imaging apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101339288A CN101339288A (en) | 2009-01-07 |
| CN101339288B true CN101339288B (en) | 2011-02-16 |
Family
ID=40213395
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008101282349A Expired - Fee Related CN101339288B (en) | 2007-07-05 | 2008-07-04 | Imaging lens and imaging device |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP5065159B2 (en) |
| CN (1) | CN101339288B (en) |
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| US8654457B2 (en) | 2008-06-30 | 2014-02-18 | Konica Minolta Opto, Inc. | Wide-angle optical system, and imaging device |
| JP2010014855A (en) * | 2008-07-02 | 2010-01-21 | Fujinon Corp | Imaging lens and imaging apparatus |
| JP2010243711A (en) * | 2009-04-03 | 2010-10-28 | Ricoh Co Ltd | Wide-angle lens and imaging apparatus |
| JP5486408B2 (en) * | 2009-07-29 | 2014-05-07 | 富士フイルム株式会社 | Imaging lens and imaging apparatus |
| CN102338923B (en) * | 2010-07-16 | 2013-03-27 | 大立光电股份有限公司 | Wide viewing angle camera lens |
| JP5777181B2 (en) * | 2011-06-22 | 2015-09-09 | 富士フイルム株式会社 | Imaging lens and imaging apparatus |
| JP5834080B2 (en) | 2011-06-22 | 2015-12-16 | 富士フイルム株式会社 | Imaging lens and imaging apparatus |
| JP5754670B2 (en) * | 2011-06-29 | 2015-07-29 | 株式会社オプトロジック | Imaging lens |
| CN102360114B (en) * | 2011-10-12 | 2013-11-20 | 舜宇光学(中山)有限公司 | Monitoring lens |
| JP5893468B2 (en) * | 2012-03-29 | 2016-03-23 | 日立マクセル株式会社 | Imaging lens and imaging apparatus |
| CN103499875B (en) * | 2013-10-29 | 2015-09-30 | 姚学文 | A kind of bugeye lens |
| EP3070506B1 (en) | 2013-11-12 | 2020-04-08 | Panasonic Intellectual Property Management Co., Ltd. | Single-focus lens system, camera and automobile |
| JP6145887B2 (en) | 2014-03-12 | 2017-06-14 | 富士フイルム株式会社 | Imaging lens and imaging apparatus |
| TWI631366B (en) * | 2014-08-27 | 2018-08-01 | 佳能企業股份有限公司 | Optical lens |
| CN108594403A (en) * | 2014-08-29 | 2018-09-28 | 佳能企业股份有限公司 | Optical lens |
| CN104459944A (en) * | 2014-12-17 | 2015-03-25 | 福建福光数码科技有限公司 | Fixed focal length depth-of-field miniature lens |
| CN105824104A (en) * | 2015-01-05 | 2016-08-03 | 信泰光学(深圳)有限公司 | Wide-angle lens |
| JP2017068164A (en) * | 2015-10-01 | 2017-04-06 | オリンパス株式会社 | Wide angle optical system and image capturing device having the same |
| CN106569319B (en) * | 2015-10-12 | 2019-05-17 | 大立光电股份有限公司 | Photographing optical lens set, image-taking device and electronic device |
| CN109975959B (en) * | 2015-11-06 | 2021-06-29 | 大立光电股份有限公司 | Image capturing optical lens assembly, image capturing device and electronic device |
| CN105572847B (en) * | 2016-03-02 | 2018-08-17 | 浙江舜宇光学有限公司 | TV camera len of ultra wide-angle |
| CN106483638B (en) * | 2016-11-10 | 2019-09-20 | 信华精机有限公司 | A kind of high definition wide-angle lens |
| JP6755073B2 (en) * | 2017-04-10 | 2020-09-16 | カンタツ株式会社 | Imaging lens |
| EP3605180B1 (en) | 2017-04-26 | 2021-11-17 | Kyocera Corporation | Imaging lens |
| TWI629501B (en) * | 2017-04-28 | 2018-07-11 | 聲遠精密光學股份有限公司 | Wide angle imaging lens assembly |
| CN106997088B (en) * | 2017-05-25 | 2022-07-05 | 广东弘景光电科技股份有限公司 | High-definition monitoring optical system and camera module applying same |
| CN107121758B (en) * | 2017-06-29 | 2020-12-25 | 广东弘景光电科技股份有限公司 | High-pixel ultra-wide-angle optical system and camera module applying same |
| CN108319005A (en) * | 2018-03-28 | 2018-07-24 | 福建福光股份有限公司 | A kind of super clear 4K optical systems of the aspherical day and nights of 4mm |
| TWI806947B (en) | 2018-12-21 | 2023-07-01 | 佳能企業股份有限公司 | Optical lens |
| CN111367041B (en) * | 2018-12-25 | 2022-11-01 | 佳能企业股份有限公司 | Optical lens |
| CN110398819B (en) * | 2019-06-30 | 2021-10-19 | 瑞声光学解决方案私人有限公司 | Image pickup optical lens |
| JP6854542B1 (en) * | 2019-11-28 | 2021-04-07 | 佐藤 拙 | Optical elements, optics and optics |
| CN113625419B (en) * | 2020-05-07 | 2023-11-03 | 宁波舜宇车载光学技术有限公司 | Optical lens and imaging apparatus including the same |
| CN114967067B (en) * | 2022-07-28 | 2022-10-21 | 浙江华诺康科技有限公司 | Imaging system and optical lens |
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| JPH09311273A (en) * | 1996-05-21 | 1997-12-02 | Konica Corp | Variable focal distance lens |
| JP3672278B2 (en) * | 1996-07-22 | 2005-07-20 | フジノン株式会社 | Imaging lens |
| JPH10111454A (en) * | 1996-10-03 | 1998-04-28 | Nisca Corp | Wide angle lens |
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- 2008-07-04 CN CN2008101282349A patent/CN101339288B/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
| JP2009031762A (en) | 2009-02-12 |
| JP5065159B2 (en) | 2012-10-31 |
| CN101339288A (en) | 2009-01-07 |
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