CN201273961Y - Image taking lens and image taking apparatus - Google Patents
Image taking lens and image taking apparatus Download PDFInfo
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- CN201273961Y CN201273961Y CNU2008202107291U CN200820210729U CN201273961Y CN 201273961 Y CN201273961 Y CN 201273961Y CN U2008202107291 U CNU2008202107291 U CN U2008202107291U CN 200820210729 U CN200820210729 U CN 200820210729U CN 201273961 Y CN201273961 Y CN 201273961Y
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- imaging lens
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B9/00—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or -
- G02B9/62—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having six components only
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
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Abstract
The utility model provides a camera lens and a camera device. The camera lens has a small F value and good optical performance and tries for the development in size minimizing and cost cutting and suppresses double image. A camera lens (1) is provided with a front group (GF), an optical stop and a rear group (GR) from the side of an object, wherein, the front group (GF) and the rear group have positive refrangibility; the front group (GF) is provided with a falcate negative first lens (L1) and a bi-canvex second lens (L2) in sequence from the side of the object, wherein, the convex surface of the first lens (L1) faces the object side; the rear group (GR) is provided with a combined lens (LC) formed by jointing a third lens (L3) which has negative refrangibility with a fourth lens (L4) which has positive refrangibility, a bi-canvex fifth lens (L5) and a falcate negative sixth lens (L6) in sequence from the side of the object, wherein, the convex surface of the sixth lens (L6) faces an image side.
Description
Technical field
The utility model relates to a kind of imaging lens system and camera head, more specifically, relate to a kind of vehicle mounted camera that is suitable for using CCD (Charge Coupled Device) or CMOS imaging apparatuss such as (Complementary Metal OxideSemi conductor), monitor with the imaging lens system of camera etc. and possess the camera head of this imaging lens system.
Background technology
In recent years, camera heads such as the digital static camera of the imaging apparatus of use CCD or CMOS etc. or video camera are popularized.These devices are used for monitoring with camera or vehicle mounted camera etc. more, to high performance, and the requirement of miniaturization uprise.Meanwhile, for imaging lens system that it carried at high performance, and the requirement of miniaturization also uprise.
At patent documentation 1～3,, disclose by several 6 imaging lens systems that constitute of less sheet as carrying at the lens that monitor with camera etc.More specifically, at patent documentation 1, record by pre-group that comprises non-spherical lens and the back group of imaging lens systems that constitute with positive refracting power.Record at patent documentation 2 and to be constructed such that imaging lens system with long back focal length.Record at patent documentation 3 and to dispose the imaging lens system that engages lens as side.
[patent documentation 1] patent disclosure 2005-24969 communique
No. the 3723637th, [patent documentation 2] patent
No. 3478643 communique of [patent documentation 3] patent
Imagination is carried at the imaging lens system that monitors with the camera head of camera or vehicle mounted camera etc., uses the temperature range widely in from the outer gas in cold district to the car in the summer of tropical zone.Therefore, that considers these is provided with place or environment for use etc., and preferred influence of temperature variation is little, wishes along with the variation of the optical property of temperature variation is little, and for example the variable quantity of the focal position during temperature variation etc. is less.
The lens of patent documentation 1 have used non-spherical lens, but use resin as the material of non-spherical lens, then take place easily by as the problem that changes of the optical property that causes of temperature variation during above-mentioned use.In addition, evil influence that the environment when preserving causes also takes place easily, for example by the problem of the worry of the caused change of shape of heavy burden under the high temperature etc. in the lens of resin material.Consider these, then preferably with glass as material, but when non-spherical lens made with glass, become glass mold pressing non-spherical lens, be at high price just.
On the other hand, as above-mentioned camera head, by the reflection in the sensitive face (shooting face) of each lens face or CCD etc. ghost image can take place sometimes.According to the degree of ghost image because the worry of cognitive map picture is correctly arranged, so especially the supervision of carrying out Flame Image Process in photography the place ahead with camera heads such as camera or vehicle mounted cameras in, wish to suppress ghost image.
The utility model content
The utility model is In view of the foregoing, and its purpose is, provides a kind of when keeping the good optical performance and the imaging lens system that ghost image is inhibited, the F value is little, small-sized and cheap, and possesses the camera head of this imaging lens system.
Imaging lens system of the present utility model, be arranged in order pre-group with positive refracting power from object side, diaphragm, form with back group with positive refracting power, it is characterized in that, above-mentioned pre-group, possess successively from object side: with 1st lens of convex surface towards the negative meniscus shape of object side, the 2nd lens with the biconvex shape, above-mentioned back group possesses successively from object side: the 4th lens that will have the 3rd lens of negative refracting power and have a positive refracting power engage the joint lens that form, the 5th lens of biconvex shape, with with 6th lens of convex surface towards the negative meniscus shape of picture side.
Imaging lens system of the present utility model by above-mentioned formation, helps obtaining small-sized and bright optical system, also can therefore, can seek cost degradation for not using aspheric formation.In addition, imaging lens system of the present utility model engages lens by adopting, and air surface of contact that can the luminance factor composition surface is higher reduces, the generation of may command ghost image.
In addition, imaging lens system of the present utility model preferably constitutes and satisfies following conditional (1):
0.80<R
3/R
1<1.27 …(1)
In the formula,
R
1: the radius-of-curvature of the face of the object side of the 1st lens
R
3: the radius-of-curvature of the face of the object side of the 2nd lens.
In addition, imaging lens system of the present utility model preferably constitutes and satisfies following conditional (2):
2.5<fa/f<4.9 …(2)
In the formula,
F: the focal length of total system
Fa: the focal length of pre-group.
In addition, imaging lens system of the present utility model preferably constitutes and satisfies following conditional (3):
2.4<f
34/f<9.2 …(3)
In the formula,
F: the focal length of total system
f
34: the focal length of the joint lens that constitute by the 3rd lens and the 4th lens.
In addition, imaging lens system of the present utility model preferably constitutes and satisfies following conditional (4):
1.20<f
5/f<1.34 …(4)
In the formula,
F: the focal length of total system
f
5: the focal length of the 5th lens.
In addition, imaging lens system of the present utility model preferably constitutes and satisfies following conditional (5):
2.0<R
12/R
11<3.5 …(5)
In the formula,
R
11: the radius-of-curvature of the face of the object side of the 6th lens
R
12: the radius-of-curvature of the face of the picture side of the 6th lens.
In addition, imaging lens system of the present utility model preferably constitutes all lens faces for total system, constitutes and satisfies following conditional (6):
|Nd
i-1×sinθ
i|>0.065 …(6)
In the formula,
θ
i: axial edge light incides the incident angle when the object side number is i lens face
Nd
I-1: axial edge light incides the refractive index to the d line of the medium of the light incident side when the object side number is i lens face.
Need to prove that " axial edge light " is meant herein, the light of the periphery of object point from the optical axis and the entrance pupil by optical system.In addition, above-mentioned relevant θ
i" incident angle ", be the angle that axial edge light is become with axial edge light normal in the position of the individual lens face incident of i (i is the natural number since 1), this lens face.
Above-mentioned " all lens faces of total system " comprise the both sides on air surface of contact and composition surface.That is, in conditional (6), because of considering the incident from lens to air, incident, these all situations of incident, so use the refractive index to the d line of the medium of light incident side from lens to lens from air to lens." medium of light incident side " for example in the material that just means lens when lens are incident to air, just meaning air when air is incident to lens.
Camera head of the present utility model is characterized in that, possesses the imaging lens system of the present utility model of above-mentioned record and the picture that is formed by this imaging lens system is subjected to the imaging apparatus of light.
According to imaging lens system of the present utility model, comprise the joint lens, and suitably set the formation of the shape, focal power etc. of each lens, therefore, when can obtain to keep the good optical performance ghost image is inhibited and is optical system small-sized and that the F value is little.
According to camera head of the present utility model,,, can constitute small-sized and at an easy rate so can obtain the bright and good picture that ghost image is lowered because of possessing imaging lens system of the present utility model.
Description of drawings
Fig. 1 is the section of the related imaging lens system of an expression embodiment of the present utility model and the figure of axial edge light.
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 the sectional view that the lens of the related imaging lens system of expression embodiment of the present utility model 7 constitute.
Fig. 9 is the basic lens data of the related imaging lens system of embodiment of the present utility model 1.
Figure 10 is the basic lens data of the related imaging lens system of embodiment of the present utility model 2.
Figure 11 is the basic lens data of the related imaging lens system of embodiment of the present utility model 3.
Figure 12 is the basic lens data of the related imaging lens system of embodiment of the present utility model 4.
Figure 13 is the basic lens data of the related imaging lens system of embodiment of the present utility model 5.
Figure 14 is the basic lens data of the related imaging lens system of embodiment of the present utility model 6.
Figure 15 is the basic lens data of the related imaging lens system of embodiment of the present utility model 7.
Figure 16 is the various data of embodiment 1～7 of the present utility model.
Figure 17 A is the value corresponding to the conditional of embodiment 1～7 of the present utility model (1)～(5).
Figure 17 B is the value corresponding to the conditional of embodiment 1～7 of the present utility model (6).
Figure 18 is each aberration diagram of the related imaging lens system of embodiment of the present utility model 1.
Figure 19 is each aberration diagram of the related imaging lens system of embodiment of the present utility model 2.
Figure 20 is each aberration diagram of the related imaging lens system of embodiment of the present utility model 3.
Figure 21 is each aberration diagram of the related imaging lens system of embodiment of the present utility model 4.
Figure 22 is each aberration diagram of the related imaging lens system of embodiment of the present utility model 5.
Figure 23 is each aberration diagram of the related imaging lens system of embodiment of the present utility model 6.
Figure 24 is each aberration diagram of the related imaging lens system of embodiment of the present utility model 7.
Figure 25 is the figure of the configuration of the vehicle mounted camera head that is used to illustrate that embodiment of the present utility model is related.
Among the figure: the 1-imaging lens system, 2-axial edge light, the 5-imaging apparatus, the 100-automobile, 101, the outer camera of 102-car, camera in the 103-car, Di (i=1,2,3 ... face interval on the optical axis an of)-i face and i+1 face, GF-pre-group, group behind the GR-, 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-engage lens, the Pim-image space, Ri (i=1,2,3 ... the radius-of-curvature an of)-i face, the Sim-image planes, the St-aperture diaphragm, the Z-optical axis
Embodiment
Below, explain embodiment of the present utility model with reference to drawing.At first, the embodiment of imaging lens system of the present utility model is described, the embodiment of imaging lens system is described thereafter.
Fig. 1 is the lens profile of the related imaging lens system 1 of an expression embodiment of the present utility model.At Fig. 1, also represent axial edge light (the most peripheral light of axial ray) 2 in the lump.Need to prove that this configuration example shown in Figure 1 is that the lens of correspondence embodiment described later 1 shown in Figure 2 constitute.In addition, at Fig. 3～Fig. 8, the lens profile figure of another configuration example of the imaging lens system that the expression present embodiment is related, the lens of these corresponding embodiment 2～7 described later constitute.The imaging lens system of embodiment 1～7, because of basic lens constitute identical, so following as the related imaging lens system of embodiment of the present utility model, be that example describes with the imaging lens system 1 of configuration example shown in Figure 1.
Need to prove that the aperture diaphragm St among Fig. 1 is not expression shape or size but position on the expression optical axis Z.In addition, at Fig. 1, consider that imaging lens system 1 is applicable to the situation of camera head, also expression is configured in the imaging apparatus 5 of the image planes Sim of the image space Pim that comprises imaging lens system.Imaging apparatus 5 is the devices that the picture that is formed by imaging lens system 1 are subjected to light, and will be converted to electric signal by the optical image that imaging lens system 1 forms.Imaging apparatus 5 for example is made of ccd image sensor etc.
Though do not represent at Fig. 1, but when imaging lens system 1 is useful in camera head, formation according to the phase pusher side that lens are installed can dispose various wave filters such as glass cover, low-pass filter, infrared ray cut off filter, ultraviolet cutoff wave filter between imaging lens system 1 and imaging apparatus 5.For example, this imaging lens system uses at the vehicle mounted camera, when subsidizing the scotopia camera use of usefulness as the vision at night, can insert between lens combination and imaging apparatus by the wave filter from ultraviolet ray to blue light.
At imaging lens system 1, be made as negative meniscus shaped lens by the 6th lens L6 by being configured in by the 1st lens L1 of object side and being configured in as side, just can seek miniaturization and revisal curvature of the image well.In addition, at imaging lens system 1, by engaging lens LC with the state configuration of the picture side adjacency of aperture diaphragm St, chromatic aberation on the revisal axle well.
0.80<R
3/R
1<1.27 …(1)
2.5<fa/f<4.9 …(2)
2.4<f
34/f<9.2 …(3)
1.20<f
5/f<1.34 …(4)
2.0<R
12/R
11<3.5 …(5)
In the formula,
R
1: the radius-of-curvature of the face of the object side of the 1st lens
R
3: the radius-of-curvature of the face of the object side of the 2nd lens
F: the focal length of total system
Fa: the focal length of pre-group
f
34: the focal length of the joint lens that constitute by the 3rd lens and the 4th lens
f
5: the focal length of the 5th lens
R
11: the radius-of-curvature of the face of the object side of the 6th lens
R
12: the radius-of-curvature of the face of the picture side of the 6th lens.
Conditional (1) relates to the ratio of radius-of-curvature of face of the object side of the radius-of-curvature of face of object side of the 1st lens L1 and the 2nd lens L2.If surpass the upper limit of conditional (1), revisal coma aberration well then, if be lower than its lower limit, then aberration is distorted in revisal well.
Conditional (2) relates to the focal power ratio of the pre-group GF of relative total system.If surpass conditional (2) upper limit, revisal spherical aberration well then is if be lower than its lower limit, then revisal coma aberration well.
Conditional (3) relates to the focal power ratio to total system that is configured near the joint lens LC of aperture diaphragm St.If surpass the upper limit of conditional (3), the chromatic aberation of revisal multiplying power well then, if be lower than its lower limit, chromatic aberation on the revisal axle well then.
Conditional (4) relates to the focal power ratio of the 5th lens L5 of relative total system focal power.If surpass the upper limit of conditional (4), chromatic aberation on the revisal axle well then, if be lower than its lower limit, revisal curvature of the image well then.
Conditional (5) relates to the ratio of radius-of-curvature of the face of the face of object side of the 6th lens L6 and picture side, relates to the focal power ratio of the face of the face of object side of the 6th lens L6 and picture side.If surpass the upper limit of conditional (5), revisal spherical aberration well then, if be lower than its lower limit, revisal curvature of the image well then.
In addition, with regard to imaging lens system 1, in order to control ghost image, all lens faces that preferably are constituted as at total system satisfy following conditional (6).
|Nd
i-1×sinθ
i|>0.065 …(6)
In the formula,
θ
i: axial edge light incides the incident angle when the object side number is i lens face
Nd
I-1: axial edge light incides the refractive index to the d line of the medium of the light incident side when the object side number is i lens face
At Fig. 1, the incident angle when axial edge light is incided the 1st lens face (face of the object side of the 1st lens L1) is made as θ 1, dots the normal of face of this moment, and the refractive index of the medium (air in this example) of light incident side is represented as Nd0.In addition, at Fig. 1, the incident angle of the axial edge light when axial edge light incides the 2nd lens face (face of the picture side of the 1st lens L1) is made as θ 2, dot the normal of face of this moment, the refractive index of the medium (material of the 1st lens L1 in this example) of light incident side is represented as Nd1.
Ghost image is to be incident to imaging apparatus 5 by the light by reflections such as imaging apparatus 5 or lens faces to produce.Reflectivity in imaging lens system 5 is compared greatly with the reflectivity in lens face, therefore, with compare by the caused ghost image of lens face reflection each other, by the caused ghost image of reflection between imaging apparatus 5 and any lens face, the stronger tendency of its intensity exists.
If general rotation symmetric optical system, the axial edge light of upside of lens face that sees through total system is just advanced along opposite direction in the path identical with the axial edge light of downside by imaging apparatus 5 reflections.Incident angle in each lens face of the axial edge light that this advances is in the other direction considered Snell's law, is stipulated by conditional (6).
In addition, if incident angle diminishes, then diminished by the angle that reflected light became of incident light with this moment, so (image forming area) assembles above-mentioned reflected light in the effective range on imaging apparatus 5 (image planes Sim), the possibility that becomes the ghost image of image recognition obstacle uprises.At this, make to satisfy condition formula (6) and incident angle is strengthened that it is big that the angle that incident light is become with reflected light becomes, and can reduce the catoptrical optically focused density that the image that reaches on the imaging apparatus 5 forms the field, therefore, the generation of may command ghost image or the light intensity of ghost image.That is, if the formula (6) that satisfies condition, then at by imaging apparatus 5 reflections and at the light of each lens face reflection with regard to the may command ghost image.
Need to prove, even for off-axis ray, by imaging apparatus 5 reflection and at the light of each lens face reflection, become with the axle glazed thread by imaging apparatus 5 reflection and at the same optically focused of each lens face reflex time, therefore, to marginal ray, just can obtain to control the effect of ghost image by predetermined axis as conditional (6) effectively.
In addition, in imaging lens system 1, constitute and the 3rd lens L3 and the 4th lens L4 engaged and become and engage lens LC.Engage lens LC, not only favourable on optical aberration correcting, and just can be with 1 of lens face and the contacted air surface of contact minimizing of air by forming the composition surface.Because the composition surface is littler than the reflectivity of air surface of contact, so by adopting the composition surface just can obtain to control the effect of the strong ghost image of intensity.
And, imaging lens system 1 be with the shape of convex surface towards the picture side by the 6th lens L6 as side, therefore, by the light of the sensitive face of imaging apparatus 5 reflection the 6th lens as the face of side again secondary reflection incorporate into when being incident upon imaging apparatus 5, become diverging light easily, thus, also can obtain to control the effect of ghost image according to this formation.With respect to this, if be made as concave surface, at this concave surface secondary reflection again, then become and converge light, and the possibility height of the strong ghost image of intensity takes place on imaging apparatus 5 by the light of imaging apparatus 5 reflections at face as side with the 6th lens L6.
Usually, imaging lens system 1 is for example when severe environment such as vehicle mounted camera use, be configured in the lens that lean on object side most, the preferred temperature variation of using the anti-anti-surface deterioration that causes by wind and rain, causing by direct sunlight, further the material of chemicals such as anti-anti-grease lotion, be water tolerance, against weather, acid resistance, the contour material of resistance to chemical reagents.
In addition, as being configured in the material of leaning on object side most, preferred use is hard, difficulty is split broken material, particularly preferably uses glass or pottery.Usually pottery and glassy phase are than having intensity height, character that thermotolerance is high.
In addition, this imaging lens system, when for example being useful in the vehicle mounted camera, requirement can be used the temperature range widely in from the outer gas in cold district to the car in the summer of tropical zone.Use as the material of lens, is preferably used the little material of linear expansion coefficient when broad range.In addition, make lens for cheapness, preferably all lens faces are spherical lens.
[embodiment]
Secondly, the concrete numerical value embodiment of the imaging lens system that the utility model is related is described.
The lens pie graph of representing the imaging lens system that embodiment 1～7 is related at Fig. 2～Fig. 8.At Fig. 2～Fig. 8, the left side of figure is made as object side, image planes are made as Sim illustrate.Need to prove, be position on the expression optical axis Z but not expression shape or size at the illustrated aperture diaphragm St of Fig. 2～Fig. 8.
The basic lens data of representing embodiment 1～7 at Fig. 9～Figure 15.Lens data at Fig. 9～Figure 15, Si represents to lean on most the face of the inscape of object side to be made as the 1st and along with towards i the face number that increases successively as side, Ri represents the radius-of-curvature of i face, Di represent on the optical axis Z between i face and i+1 the face face at interval, medium among the Ndi presentation surface interval D i is to the refractive index of d line, and vdj represents the Abbe number to the d line of j optical parameter.
Need to prove, in the basic lens data of Fig. 9～Figure 15, also comprise the object plane that is positioned at infinity and aperture diaphragm St and put down in writing,, in the hurdle of radius-of-curvature, be designated as (aperture diaphragm) about aperture diaphragm St.With regard to radius-of-curvature, just be made as, when being protruding, be made as when being protruding negative as side at object side.Radius-of-curvature and face unit at interval for example can be mm.
At each embodiment, Ri, the Di of basic lens data (i=1,2,3 ...) corresponding with symbol Ri, the Di of lens pie graph.Si and Ri be i=1,2,3 ..., Di and Ndi be i=0,1,2,3 ..., vdj be j=1,2,3 ...
Arbitrary example of embodiment 1～7, pre-group is made of the 1st lens L1, the 2nd lens L2, and the back group be made of the 3rd lens L3, the 4th lens L4, the 5th lens L5, the 6th lens L6.
At Figure 16, the focal length of the total system of the imaging lens system that embodiment 1～7 is related, F value, full visual angle are represented as focal distance f, FNO., visual angle 2 ω respectively.
In addition, at Figure 17 A, Figure 17 B, expression is corresponding to the value of conditional (1)～(6) of the related imaging lens system of embodiment 1～7.Hence one can see that, the imaging lens system of embodiment 1～7 formula (1)～(6) that all satisfy condition.
Need to prove that embodiment 1～7 is a reference wavelength with e line (wavelength 546.07nm), the value of Figure 17 A, Figure 17 B is the value of relevant e line.
The aberration diagram of representing the spherical aberration of the imaging lens system that the foregoing description 1～7 is related, astigmatic aberration, distortion aberration (distortion aberration), multiplying power chromatic aberation, coma aberration at Figure 18～Figure 24 respectively.Represent e line (wavelength 546.07nm) is the aberration of reference wavelength at each aberration diagram, but also represent the aberration of relevant g line (wavelength 435.83nm), C line (wavelength 656.3nm), s line (wavelength 852.11nm) at spherical aberration diagram and multiplying power chromatic aberation figure.(parameter is handled, and 0 ≦ θ ≦ ω), desirable image height is made as f * tan θ represents the side-play amount apart from it for the focal distance f of distortion aberration diagram use total system, half angle of view θ.In the coma aberration, the left side of each figure represents that the aberration of meridian direction, right side represent the aberration of sagitta of arc direction.The FNO. of spherical aberration diagram is the F value, and the ω of other aberration diagrams represents half angle of view.
From above data as can be known, the foregoing description 1～7 is constituted as small-sized, compares with the imaging lens system of patent documentation 3, is to have the little bright optical system to 2.0 value of F value, and full visual angle also has 53～57 ° wide viewing angle.In addition, from aberration diagram as can be known, the foregoing description 1～7 has little F value, and from the viewing area near infrared wide wave band, therefore each aberration diagram of revisal well, not only is suitable for the shooting that shooting between daytime also is suitable for night.Further, the foregoing description 1～7 does not use aspheric surface all to be made of spherical lens, therefore, can make at an easy rate.
The imaging lens system of this embodiment 1～7 can be fit to use at vehicle mounted camera of the image at the place ahead that is used to photograph automobile, side, rear etc. etc.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 25.
At Figure 25, automobile 100 possesses: the outer camera 101 of the car of the dead range of the side of its codriver's seat side that is used to photograph; The outer camera 102 of car of dead range of automobile 100 rear sides is used to photograph; Be installed on the rearview mirror back side and the car with driver's the same visual field scope of being used to photograph in camera 103.Camera 103 is camera heads in the outer camera 101 of car, the outer camera 102 of car and the car, possesses the imaging lens system 1 of embodiment of the present utility model and the optical image that imaging lens system 1 forms is converted to the imaging apparatus 5 of electric signal.
More than, the mode and the embodiment that exemplify enforcement have illustrated the utility model, but the utility model is not limited to the mode and the embodiment of above-mentioned enforcement, can carry out various deformation.For example, the value of the radius-of-curvature of each lens composition, face interval and refractive index is not limited to the value shown in above-mentioned each numerical value embodiment, desirable other values.
In addition, in the embodiment of camera head, illustrated that with figure the utility model is useful in the example of vehicle mounted camera, but the utility model is not limited thereto purposes, for example also applicable at used for mobile terminal camera or monitoring camera etc.
Claims (8)
1. imaging lens system, the back group who is arranged in order pre-group, the diaphragm with positive refracting power and has a positive refracting power from object side forms, it is characterized in that,
Above-mentioned pre-group possesses successively from object side: with convex surface towards the 1st lens of the negative meniscus shape of object side and the 2nd lens of biconvex shape,
Above-mentioned back group possesses successively from object side: the 4th lens that will have the 3rd lens of negative refracting power and have a positive refracting power engage the 5th lens of the joint lens that form, biconvex shape and with 6th lens of convex surface towards the negative meniscus shape of picture side.
2. imaging lens system according to claim 1 is characterized in that,
Constitute and satisfy following conditional (1):
0.80<R
3/R
1<1.27 …(1)
In the formula,
R
1: the radius-of-curvature of the face of the object side of the 1st lens
R
3: the radius-of-curvature of the face of the object side of the 2nd lens.
3. imaging lens system according to claim 1 and 2 is characterized in that,
Constitute and satisfy following conditional (2):
2.5<fa/f<4.9 …(2)
In the formula,
F: the focal length of total system
Fa: the focal length of pre-group.
4. imaging lens system according to claim 1 and 2 is characterized in that,
Constitute and satisfy following conditional (3):
2.4<f
34/f<9.2 …(3)
In the formula,
F: the focal length of total system
f
34: the focal length of the joint lens that constitute by the 3rd lens and the 4th lens.
5. imaging lens system according to claim 1 and 2 is characterized in that,
Constitute and satisfy following conditional (4):
1.20<f
5/f<1.34 …(4)
In the formula,
F: the focal length of total system
f
5: the focal length of the 5th lens.
6. imaging lens system according to claim 1 and 2 is characterized in that,
Constitute and satisfy following conditional (5):
2.0<R
12/R
11<3.5 …(5)
In the formula,
R
11: the radius-of-curvature of the face of the object side of the 6th lens
R
12: the radius-of-curvature of the face of the picture side of the 6th lens.
7. imaging lens system according to claim 1 and 2 is characterized in that,
For all lens faces of total system, constitute and satisfy following conditional (6):
|Nd
i-1×sinθ
i|>0.065 …(6)
In the formula,
θ
i: axial edge light incides the incident angle when the object side number is i lens face
Nd
I-1: axial edge light incides the refractive index to the d line of the medium of the light incident side when the object side number is i lens face.
8. camera head is characterized in that possessing:
Aforesaid right require 1 or 2 described imaging lens systems and
The picture that is formed by this imaging lens system is subjected to the imaging apparatus of light.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2008059127A JP5143595B2 (en) | 2008-03-10 | 2008-03-10 | Imaging lens and imaging apparatus |
| JP2008059127 | 2008-03-10 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201273961Y true CN201273961Y (en) | 2009-07-15 |
Family
ID=40884304
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008202107291U Expired - Lifetime CN201273961Y (en) | 2008-03-10 | 2008-10-06 | Image taking lens and image taking apparatus |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP5143595B2 (en) |
| CN (1) | CN201273961Y (en) |
| TW (1) | TWM356914U (en) |
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Also Published As
| Publication number | Publication date |
|---|---|
| JP5143595B2 (en) | 2013-02-13 |
| TWM356914U (en) | 2009-05-11 |
| JP2009216858A (en) | 2009-09-24 |
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| TR01 | Transfer of patent right |
Effective date of registration: 20181016 Address after: Tokyo, Japan Patentee after: Fuji Film Corp. Address before: Japan's Saitama Prefecture Patentee before: Fujinon Corp. |
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Granted publication date: 20090715 |