CN201340474Y - 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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- CN201340474Y CN201340474Y CNU200820176100XU CN200820176100U CN201340474Y CN 201340474 Y CN201340474 Y CN 201340474Y CN U200820176100X U CNU200820176100X U CN U200820176100XU CN 200820176100 U CN200820176100 U CN 200820176100U CN 201340474 Y CN201340474 Y CN 201340474Y
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Abstract
The utility model provides an image pick-up lens and an image pick-up device. The image pick-up lens is provided with good optical property and forms a small wide-angle optics. From the side of an object, the image pick-up device (1) sequentially comprises a front GF with negative focal power and a rear GR with positive focal power. At least one lens of the lenses forming the image pick-up lens 1 is provided with at least one non-spherical surface. The non-spherical surface of the image pick-up lens 1 is formed in a way that the acute angle between the tangent 4 of a specified point X4 in the effective area of the lens surface and an optical axis Z is less than 30 degrees.
Description
Technical field
The utility model relates to a kind of imaging lens system and camera head, more specifically relates to the imaging lens system that is applicable to vehicle mounted camera, used for mobile terminal camera, monitor camera etc., and possesses the camera head of this imaging lens system.
Background technology
The miniaturization of imaging apparatus such as CCD or CMOS and high pixelation were developing rapidly in recent years.Meanwhile, the miniaturization of picture pick-up device body that possesses these imaging apparatuss except the good optical performance, also requires miniaturization, lightweight for imaging lens system that it loaded also in development.
On the other hand, in vehicle mounted camera or monitor camera etc., require to have high-weatherability, and from the outer gas on cold ground in the car in tropicopolitan summer and in the spendable small-sized and wide-angle of wide temperature range, and high performance lens.
As among known imaging lens system in the past, applicable to vehicle mounted camera or monitor camera etc., the fewer imaging lens system of lens number, have the imaging lens system that for example following patent documentation 1～5 is put down in writing.
[patent documentation 1] patent disclosure 2006-259704 communique
[patent documentation 2] patent disclosure 2002-244031 communique
[patent documentation 3] patent disclosure 2005-227426 communique
[patent documentation 4] patent disclosure 2001-337268 communique
The flat 8-211982 communique of [patent documentation 5] patent disclosure (No. 3672278 instructions of patent)
Yet, above-mentioned patent documentation 1,2,3 imaging lens systems of being put down in writing, seek wide-angleization and all aberrations such as correcting distorted well aspect leave some room for improvement.
The imaging lens system that patent documentation 4 is put down in writing is except that miniaturization is insufficient; most leaning on the object side lens is plastic lens, so, when for example being applicable to the vehicle mounted camera; by the object side lens need guard block such as cloche by object side, cause the maximization of device.
The utility model content
The utility model is the above-mentioned situation that is referred from, and its purpose is to provide a kind of small-sized and wide-angle and keeps the imaging lens system of good imaging performance and possess the camera head of this imaging lens system.
Imaging lens system of the present utility model, form by having preceding group of negative power and having back group of positive light coke successively from object side, having acute angle that the tangent line according to the regulation point in the effective field of lens face become with optical axis becomes the aspheric surface that mode below 30 ° comprises afore mentioned rules point.
In addition, " effectively field " of lens face means by scioptics face and the intersection point of employed full light and this lens face forms in the imaging of shot object image field, if the system of symmetrical, then so-called " in the effective diameter " is consistent with " effectively field ".Because, in the system of symmetrical " effective diameter " mean by the scioptics face and in the imaging of shot object image in the employed full light, by outermost (from optical axis from farthest position) light and the circular diameter described of the intersection point of this lens face.Effectively the field for example can be by the decisions such as specification of aperture diaphragm or imaging lens system.
And, " regulation point " of the present utility model be in the effective diameter arbitrarily a bit can, for example, can be made as the point of effective field circumference.Herein, " effectively field circumference " is by scioptics face and the intersection point of light among the employed full light, by outermost (from optical axis from position that must be farthest) and this lens face forms in the imaging of shot object image position.In the system of symmetrical, effectively the point of field circumference is consistent with the point of effective diameter end.
The object side lens that lean on most of group were negative lens before imaging lens system of the present utility model was preferred, and the back group comprises diaphragm and at least 2 lens.
Imaging lens system of the present utility model constitutes: preceding group is formed by the 1st negative lens and the 2nd negative lens successively from object side, and the back group is formed by the 3rd positive lens, diaphragm and the 4th positive lens successively from object side also can.
Perhaps, imaging lens system of the present utility model constitutes: preceding group is formed by the 1st negative lens, the 2nd negative lens successively from object side, and the back group is formed by the 5th lens of the 3rd positive lens, diaphragm, positive the 4th lens and plus or minus successively from object side also can.
And, in imaging lens system of the present utility model, preceding group have comprise afore mentioned rules point aspheric surface also can, or back group has the aspheric surface that comprises afore mentioned rules point and also can.
In addition, in the utility model, in the situation of non-spherical lens, " positive lens " mean the lens that have positive light coke in the paraxial field of these lens, and " negative lens " mean the lens that have negative power in the paraxial field of these lens,
Imaging lens system of the present utility model is characterized in that, possesses the imaging lens system of the present utility model of above-mentioned record.
In addition, the numerical value of the Abbe number put down in writing of this instructions is the numerical value at d line (587.56nm).
In imaging lens system of the present utility model, group has negative power before adopting, the anti-long distance configuration with positive light coke is organized in the back, so help wide-angleization.And, imaging lens system of the present utility model has acute angle that the tangent line according to the regulation point in effective field become with optical axis becomes the aspheric surface that mode below 30 ° comprises afore mentioned rules point, so, proofread and correct various aberrations effectively, and can seek wide-angleization, and miniaturization total system.
Camera head of the present utility model possesses above-mentioned imaging lens system of the present utility model, so, can constitute small-sized and wide can be made a video recording, and can obtain preferable image.
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 Fig. 8 (A)～Fig. 8 (D) is each aberration diagram of the related imaging lens system of embodiment of the present utility model 1.
Fig. 9 Fig. 9 (A)～Fig. 9 (D) is each aberration diagram of the related imaging lens system of embodiment of the present utility model 2.
Figure 10 Figure 10 (A)～Figure 10 (D) is each aberration diagram of the related imaging lens system of embodiment of the present utility model 3.
Figure 11 Figure 11 (A)～Figure 11 (D) is each aberration diagram of the related imaging lens system of embodiment of the present utility model 4.
Figure 12 Figure 12 (A)～Figure 12 (D) is each aberration diagram of the related imaging lens system of embodiment of the present utility model 5.
Figure 13 Figure 13 (A)～Figure 11 (D) is each aberration diagram of the related imaging lens system of embodiment of the present utility model 6.
Figure 14 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: 1-imaging lens system, light beam on the 2-axle, 3-axle outer light beam, the 4-tangent line, 5-imaging apparatus, 11,12-shading means, the 100-automobile, 101, the outer camera of 102-car, camera in the 103-car, face interval on the optical axis of i face of Di-and i+1 face, Pim-image space, L11, L12, L21, L22, L23-lens, the PP-optics, the radius-of-curvature of i face of Ri-, St-aperture diaphragm, the X4-point, the Z-optical axis.
Embodiment
Below, with reference to accompanying drawing embodiment of the present utility model is elaborated.
The lens profile figure that represents the section that comprises optical axis Z of the imaging lens system 1 that an embodiment of the present utility model is related at Fig. 1.The axle outer light beam 3 at light beam 2, maximum visual angle on Fig. 1 also represents have from the axle of the object point that is positioned at infinite distance in the lump.Herein, light beam is the light beam from the object point on the optical axis on the axle, and the axle outer light beam is the light beam from the outer object point of optical axis.In addition, this configuration example shown in Figure 1 constitutes corresponding to the lens of aftermentioned embodiment shown in Figure 21.And, represent to have the lens profile figure of the section that comprises optical axis Z of another configuration example of imaging lens system of the present utility model at Fig. 3～Fig. 7, these lens corresponding to aftermentioned embodiment 2～6 constitute.
At first, be example with the imaging lens system 1 of formation shown in Figure 1, the basic comprising of the related imaging lens system of embodiment of the present utility model is described.The imaging lens system 1 of example shown in Figure 1 is formed by lens L11, lens L12, lens L21, aperture diaphragm St, lens L22 successively from object side.
In addition, the aperture diaphragm St among Fig. 1 is not its shape of expression or size, and represents its position on optical axis Z.And, in Fig. 1, consider that imaging lens system 1 is applicable to the situation of camera head, also figure is shown with the imaging apparatus 5 of the image planes that are configured in the image space Pim that comprises imaging lens system 1.Imaging apparatus 5 is transformed to electric signal with imaging lens system 1 formed optical image, for example, is formed by ccd image sensor etc.
And, be applicable under the situation of camera head, formation according to the photograph pusher side of loading lens, preferred disposition cloche, low-pass filter or infrared intercepting filter etc. are represented to have at Fig. 1 the parallel flat shape optics PP after these imaginations is configured in example between lens combination and the imaging apparatus 5.For example, be used in onboard camera, when subsidy is used with the scotopia camera as night vision, between lens combination and imaging apparatus, insert and also can by ultraviolet light to the optical filter of blue light at imaging lens system 1.
In addition, substitute between lens combination and imaging apparatus 5 the configuration low-pass filter or by the various optical filters in specific wavelength territory etc., these various optical filters of configuration also can between each lens.Perhaps, the lens face of any lens that have at imaging lens system 1 applies the coating that has with the same effect of various optical filters and also can.
The imaging lens system that present embodiment is related, summary is formed by preceding group of GF with negative power and back group of GR with positive light coke successively from object side.Like this, have negative power by group before adopting and then organize anti-Jiao (retrofocus: also claim anti-long distance) configuration, help wide-angleization with positive light coke.In example shown in Figure 1, preceding group of GF formed by lens L11 and lens L12, back group GR by lens L21, aperture diaphragm St, and lens L22 form.
And, the imaging lens system that present embodiment is related, have as distinctive formation: the acute angle that is become with optical axis according to the tangent line of the regulation point in effective field of lens face becomes the aspheric surface that mode below 30 ° comprises afore mentioned rules point (below, be called dark curved surface aspheric surface).
Herein, " effectively the tangent line of the regulation point in field become with light acute angle " is from the regulation point in effective field during towards the tangent line of optical axis extraction lens face, the acute angle that this tangent line is become with optical axis.In example shown in Figure 1, the picture side S4 of the 2nd lens should be in dark curved surface aspheric surface, and the acute angle theta X4 that is become with optical axis Z at the lens face tangent line 4 of the some X4 in effective field of face S4 becomes below 30 ° and constitutes.By comprising this dark curved surface aspheric surface, when can proofread and correct various aberration efficiently, wide-angleization and Miniaturizable total system easily.This regulation point for example can be made as the point of effective diameter end.
The acute angle that tangent line and optical axis became at the regulation point in the dark aspheric effective field of curved surface is preferably between 30 °～18 °.If this acute angle becomes below 18 °, then be difficult to processing or instrumentation, and be difficult to make or become the reason that cost rises.Further, this acute angle is preferably between 30 °～22 °, this moment cost is risen to be controlled at irreducible minimum, and can proofread and correct each aberration well.
Dark curved surface aspheric surface according to the mode of group GF before being arranged in constitute also can, at this moment, can be correcting distorted easily.
Dark curved surface aspheric surface in preceding group of GF, and, preceding group of GF from object side successively by the 1st negative lens, when the 2nd negative lens form, dark curved surface aspheric surface is preferably the picture side of the 2nd lens.According to this formation, can be further correcting distorted easily.
Perhaps, dark curved surface aspheric surface according to the mode that is arranged in back group GR constitute also can, at this moment, can proofread and correct curvature of the image and multiplying power chromatic aberation well.
Dark curved surface aspheric surface is in the group GR of back the time, dark curved surface aspheric surface be preferably back group GR by the object side of object side lens.According to this formation, can further proofread and correct curvature of the image and multiplying power chromatic aberation easily.
In addition, as the formation of preceding group of GF of imaging lens system, back group GR preferred before group GF be negative lens by the object side lens, back group GR comprises aperture diaphragm St and at least 2 lens.Especially, aperture diaphragm St preferred disposition is between the included lens of back group GR.
Be made as negative lens by the object side lens that lean on most, can catch light with wide-angle incident with preceding group of GF, therefore, easily with system's wide-angleization.Group GR comprises 2 lens at least by the back, easily aberration correction.And group GR comprises aperture diaphragm St by the back, and aperture diaphragm St also disposes more by the picture side in total system, and easy wide-angleization.
Particularly, for example, example as shown in Figure 1 can constitute: preceding group of GF formed by the 1st negative lens and the 2nd negative lens successively from object side, and back group GR is formed by the 3rd positive lens, aperture diaphragm and the 4th positive lens successively from object side.
Like this, when preceding group of GF is made of 2 negative lens, can be further easily wide-angleization the time, also can be correcting distorted easily, constitute by 2 positive lenss and the aperture diaphragm St that is configured between it by back group GR, well correcting spherical aberration (also claiming spherical aberration), curvature of the image (also claiming the curvature of field), intelligent image poor (also claiming coma).
In addition, the formation as preceding group of GF, back group GR is not limited to example shown in Figure 1, desirable variety of way.For example, also can constitute: preceding group of GF formed by the 1st negative lens, the 2nd negative lens successively from object side, and back group GR is formed by the 3rd positive lens, aperture diaphragm, positive the 4th lens and the 5th lens of plus or minus successively from object side.
Effect before constituting with 2 negative lens during group GF such as above-mentioned.With as above-mentioned the 3rd lens, aperture diaphragm, the 4th lens, when the 5th lens constitute back group GR, can be further correcting spherical aberration, curvature of the image, intelligent image are poor well.
And, with back group GR be made as positive lens by the object side lens time, the Abbe number that constitutes the material of these lens is preferably below 40.According to this formation, can proofread and correct the multiplying power chromatic aberation well.
In the lens that comprise above-mentioned the 4th lens constituted, the Abbe number that constitutes the lens material of the 4th lens was preferably more than 45.According to this formation, can proofread and correct the multiplying power chromatic aberation well.
In the lens that comprise above-mentioned the 5th lens constituted, the Abbe number that constitutes the lens material of the 5th lens was preferably below 45.According to this formation, the chromatic aberation on the axis calibration well.
More specifically, imaging lens system can adopt the 1st, the 2nd, the 3rd mode of the following stated.
[the 1st mode]
With regard to the 1st mode, preceding group of GF formed towards the 1st negative lens as side by concave surface, and back group GR is formed by the 2nd positive lens, aperture diaphragm, the 3rd positive lens successively from object side.
The 1st lens are preferably negative meniscus shaped lens.Further,, for example also can catch incident angle and surpass 100 ° light if the 1st lens are made as the negative meniscus shaped lens of concave surface towards object side, can be with the total system wide-angleization.
The 1st lens are that concave surface also can towards the plano-convex lens of picture side.And the 1st lens are that the radius-of-curvature absolute value of object side is than also can as the big biconcave lens of the radius-of-curvature absolute value of side.By the 1st lens are made as concave surface towards the radius-of-curvature absolute value of picture plano-convex lens of side or object side than as the big biconcave lens of the radius-of-curvature absolute value of side, can be with imaging lens system wide-angleization more.
In the 1st mode, if the 1st lens are made as the negative meniscus lens of concave surface towards object side, and at least one side is made as aspheric surface, for example then also can catching, incident angle surpasses 100 ° of light, in the time of can be with the total system wide-angleization, also can be correcting distorted simultaneously, curvature of the image etc.
In the 1st mode, dark curved surface aspheric surface is the object side of the 2nd lens preferably, at this moment, proofreaies and correct curvature of the image and multiplying power chromatic aberation easily.
In the 1st mode, the material Abbe number that constitutes the 2nd lens is preferably below 40, at this moment, can proofread and correct the multiplying power chromatic aberation well.
In the 1st mode, preferably constitute: the 1st lens are the glass spherical lens, and the 2nd lens and the 3rd lens are the plastic aspherical element lens.By the 1st lens are made as the glass spherical lens, can cheaply make the high lens of weatherability.By the 2nd lens and the 3rd lens are made as the plastic aspherical element lens, when can proofread and correct various aberration well, can total system is small-sized, lightweight, further can cheaply make lens combination.
Perhaps, in the 1st mode, the 1st lens, the 2nd lens, the 3rd lens are that the plastic aspherical element lens constitute and also can.When the 1st lens are made as the plastic aspherical element lens, preferably will be used to protect the cap assemblies such as cloche of lens combination to be configured in than the 1st lens more by object side.This cap assembly be planopaallel plate also can, perhaps also can for the curved surface shape that does not have a focal power.
In the 1st mode, when the 1st lens were made as the plastic aspherical element lens, dark curved surface aspheric surface was preferably the picture side of the 1st lens, in this situation, even for example maximum visual angle surpasses 100 ° wide-angle imaging lens, also correcting distorted well easily and curvature of the image in full visual angle.
[the 2nd mode]
With regard to the 2nd mode, before group GF from object side successively by concave surface is formed towards the 1st lens and the 2nd negative lens as the negative meniscus lens of side, back group GR from object side successively by with convex surface towards the 3rd positive lens, the aperture diaphragm St of object side, convex surface is formed towards the 4th positive lens as side.
By the 1st lens being made as the negative meniscus lens of concave surface towards object side, the 2nd lens are made as negative lens, for example can catch incident angle and surpass 100 ° light, in the time of can be with the total system wide-angleization, by negative power being distributed to the 1st lens and the 2nd lens, and the sharply not crooked back group GR that just can be directed to of light, therefore, can be correcting distorted well.And, by the 3rd lens being made as convex surface, the 4th lens being made as convex surface towards as side and lens that have positive light coke, and can proofreading and correct curvature of the image well towards object side and lens that have positive light coke.
In the 2nd mode, dark curved surface aspheric surface is preferably the picture side of the 2nd lens, and is at this moment, correcting distorted well easily.
In the 2nd mode, dark curved surface aspheric surface is preferably the object side of the 3rd lens, at this moment, proofreaies and correct curvature of the image and multiplying power chromatic aberation easily.
In the 2nd mode, dark curved surface aspheric surface is preferably the picture side of the 4th lens, at this moment, proofreaies and correct curvature of the image easily.
In the 2nd mode, the Abbe number of the material of the 1st lens, the 2nd lens, the 4th lens is preferably more than 45, and at this moment, controllable shaft is to the generation of chromatic aberation and multiplying power chromatic aberation.And preferably the Abbe number with the material of the 3rd lens is made as below 40, at this moment, can proofread and correct the multiplying power chromatic aberation well.
In the 2nd mode, the material that is preferably formed the 1st lens is a glass, and the material that forms the 2nd, the 3rd, the 4th lens is plastics.By the 1st lens are made as glass lens, can cheaply make the high lens of weatherability.Further, when the 1st lens are made as spherical lens, can cheaply make the high lens of weatherability.The the 2nd, the 3rd, the 4th lens are made as plastic lens, when further being made as non-spherical lens, when can proofread and correct various aberration well, can total system is small-sized, lightweight, further can make the lens combination cheapness.
[the 3rd mode]
With regard to the 3rd mode, before group GF from object side successively by concave surface is formed towards the 1st lens and the 2nd negative lens as the negative meniscus lens of side, back group GR from object side successively by with convex surface towards the 3rd positive lens of object side, aperture diaphragm St, with convex surface towards forming towards the 5th lens as side as the 4th positive lens of side with convex surface.
By the 1st lens being made as the negative meniscus lens of concave surface towards object side, the 2nd lens are made as negative lens, for example can also catching, incident angle surpasses 100 ° light, in the time of can be with the total system wide-angleization, by negative power being distributed to the 1st lens and the 2nd lens, and the sharply not crooked back group GR that just can be directed to of light, therefore, can be correcting distorted well.By the 3rd lens being made as the positive lens of convex surface towards object side, the 4th lens are made as the positive lens of convex surface towards the picture side, the 5th lens are made as the lens of convex surface towards the picture side, and can proofread and correct curvature of the image well and intelligent image is poor.
The 5th lens preferably are made as the negative meniscus lens of convex surface towards the picture side.If the 4th lens are made as the positive lens of convex surface towards the picture side, and the 5th lens are made as the negative meniscus lens of convex surface towards the picture side, then easy axis calibration is to chromatic aberation.
In the 3rd mode, dark curved surface aspheric surface is preferably the picture side of the 2nd lens, and is at this moment, correcting distorted well easily.
In the 3rd mode, dark curved surface aspheric surface is preferably the object side of the 3rd lens, at this moment, proofreaies and correct curvature of the image and multiplying power chromatic aberation easily.
In the 3rd mode, dark curved surface aspheric surface is preferably the picture side of the 4th lens, at this moment, proofreaies and correct curvature of the image easily.
In the 3rd mode, dark curved surface aspheric surface is preferably the object side of the 5th lens, at this moment, and when can proofread and correct curvature of the image well, the incident angle of the imaging apparatus of light when imaging apparatus is configured in image planes can be reduced, so-called telecentric iris good optical system can be realized.
In the 3rd mode, the Abbe number of the material of the 1st lens, the 2nd lens, the 4th lens preferably is made as more than 45, at this moment, controllable shaft is to the generation of chromatic aberation and multiplying power chromatic aberation.And preferably the Abbe number with the 3rd lens is made as below 40, at this moment, can proofread and correct the multiplying power chromatic aberation well.Preferably the Abbe number with the material of the 5th lens is made as below 40, and at this moment, axis calibration is to chromatic aberation well.
In the 3rd mode, preferably the 1st lens are made as spherical lens, the 2nd, the 3rd, the 4th, the 5th lens are made as non-spherical lens.And in the 3rd mode, the material that forms the 1st lens is preferably glass, and the material that forms the 2nd, the 3rd, the 4th, the 5th lens is plastics.
In the 3rd mode,, can cheaply make the high lens of weatherability by the 1st lens are made as glass lens.And, by the 1st lens are made as glass lens, and can cheaply make the high lens of weatherability.By the 2nd, the 3rd, the 4th, the 5th lens are made as the plastic aspherical element lens, when can proofread and correct various aberration well, can total system is small-sized, lightweight, further can make the lens combination cheapness.
Further, imaging lens system can adopt other optimal ways of the following stated.
[other optimal ways]
The focal length of total system is made as f, will from total system by the object side of object side lens when the distance of image planes is made as L (growing for air converts about rear cut-off distance (backfocus) amount), preferably satisfy following conditional (1).
3.0＜L/f＜18.0…(1)
If surpass the upper limit of conditional (1), then elongated the and system of total length becomes maximization.If surpass the lower limit of conditional (1), then the focal length of total system is long, and wide-angleization becomes insufficient, perhaps in order to seek wide-angleization, will guarantee the visual angle and excessive in the anamorphosis of periphery by distortion.Perhaps, the thickness attenuation of too short and each lens of total length, processability worsens.
In addition, for miniaturization, above-mentioned L is preferably below the 15mm.
In the imaging lens system of present embodiment, the focal length of total system is made as f, will be from total system when being made as Bf, preferably satisfy following conditional (2) to the distance (so-called rear cut-off distance) of image planes by the picture side of picture side lens.
0.5＜Bf/f＜3.0…(2)
If surpass the upper limit of conditional (2), then rear cut-off distance is elongated, and as a result of system becomes maximization.If surpass the lower limit of conditional (2), then be difficult between lens combination and imaging apparatus, insert cloche or various optical filter.
In the imaging lens system of present embodiment, the synthetic focal length of preceding group of GF is made as fA, when the synthetic focal length of back group GR is made as fB, preferably satisfy following conditional (3).
0.01＜|fA/fB|＜3.00…(3)
If surpass the upper limit of conditional (3), then curvature of the image becomes big, is difficult to obtain good picture.If surpass conditional (3) lower limit, then be difficult to miniaturized system integral body.
In the imaging lens system of present embodiment, the focal length of total system is made as f, preceding group of GF be made as f by the focal length of object side lens
1The time, preferably satisfy following conditional (4).
0.5＜|f
1/f|＜15.0…(4)
For with the lens combination wide-angleization, preferably preceding group of GF be made as negative lens by the object side lens.With preceding group of GF be made as negative lens by the object side lens time, if surpass the upper limit of conditional (4), then the focal power of this negative lens dies down, and is difficult to reach wide-angleization.If surpass the lower limit of conditional (4), then can reach wide-angleization easily, but be difficult to proofread and correct well curvature of the image.
Under this imaging lens system has situation as the 4th above-mentioned lens and the 5th lens, the focal length of total system is made as f, the synthetic focal length of the 4th lens and the 5th lens is made as f
45The time, preferably satisfy following conditional (5).
0.5＜f
45/f＜3.0…(5)
If surpass the upper limit of conditional (5), a little less than then the synthetic focal power of the 4th lens and the 5th lens became, be difficult to correcting colour aberration well.If surpass the lower limit of conditional (5), then the synthetic focal power of the 4th lens and the 5th lens became strong, so rear cut-off distance shortens, when this imaging lens system is applicable to the camera head with imaging apparatus, be difficult to various optical filters or cloche are inserted between lens combination and the imaging apparatus.
In the camera system of present embodiment, the focal length of total system is made as f, with organize in the past GF by as the side lens as the side to back group GR be made as DAB by the focal length on the optical axis of the object side of object side lens the time, preferably satisfy following conditional (6).
0.5＜DAB/f＜5.0…(6)
By the formula of satisfying condition (6), aberration correction the time, can seek miniaturization well.If above the upper limit of conditional (6), the big apart from change of GR organized in then preceding GF of group and back, so big at the light hypermutation of preceding group of GF, the footpath direction of lens combination is maximization.If surpass the lower limit of conditional (6), then preceding group GF and back group GR are too approaching, thus become too small at the light height of preceding group of GF, and be difficult to by preceding group of GF the axle glazing be separated with an outer light, be difficult to correcting distorted well or curvature of the image.
When this imaging lens system for example was applicable to the vehicle mounted camera, requirement can be used to the wide temperature range in the car in local summer of the torrid zone at the outer gas from cold ground.When wide temperature range is used, preferably use the little material of linear expansion coefficient as the lens material.
And, this imaging lens system is for example when the environment of strictnesses such as vehicle mounted camera or monitor camera is used, in total system, be configured in lens by object side preferably use anti-anti-surperficial cracking by wind and rain, by the temperature variation of direct sunlight, the further preferred material of using chemicalss such as anti-anti-grease washing agent, i.e. water tolerance, weatherability, acid resistance, the contour material of resistance to chemical reagents.And, preferably use firm and non-friable material by the lens material of object side as being configured in.From with last, as being configured in the lens material of leaning on object side most, preferably use glass particularly, perhaps, use transparent pottery also can.Ceramic and common glassy phase specific strength height, and have the high character of thermotolerance.
Perhaps, more lean on object side by the object side lens than being disposed at, the cap assemblies such as cloche of configuration protection lens combination also can.Cap assembly be planopaallel plate also can, the curved surface shape that does not have focal power also can.And, be disposed at protections such as dura mater that lens object side by object side applies the protection lens combination use by overlay film also can, form vitreous film and also can being disposed at the lens object side of leaning on object side most.
When being disposed at by the object side lens more by object side configuration cap assembly, the lens that are configured in by object side also can be made as the plastic aspherical element lens.Also be made as the plastic aspherical element lens by the lens that are configured in by object side, when can proofread and correct various aberration well, can be small-sized, light weight, the cheap lens combination of making.
And, as than being disposed at lens by object side, preferably use plastics more by looking like each lens material of side.By these lens materials are made as plastics, but precision is made aspherical shape well, and can obtain the good optical performance.And, by using plastics, lens combination can be made as cheapness and light weight.
And as than being disposed at lens by object side more by each lens material of picture side, the so-called nano composite film of the use particle that the mixing ratio light wavelength is little in plastics also can.Nano composite film changes by refractive index and the Abbe number that the particulate kind of mixing or amount can make material.By using nano composite film, for example can make the little material of the material of the high index of refraction that can not obtain or Abbe number etc. by so far plastic material, thus, can make the lens of good optical performance.
And as than being disposed at lens by object side more by looking like each lens material of side, preferably using refractive index is material more than 1.6.By using refractive index is material more than 1.6, can be further with the lens combination miniaturization.
By using refractive index is that the lens face of the material more than 1.6 is made as dark curved surface aspheric surface, further miniaturization.
In addition, become the anxiety that parasitic light arrival image planes become ghost owing to have by the outer light beam of the effective diameter between each lens, so, the shading means of this parasitic light being carried out shading preferably are set as required.As these shading means, for example apply opaque coating outside the branch, or the sheet material of lens is set not also can at the effective diameter of saturating image side.Perhaps, opaque sheet material being set on the light path of the light beam that becomes parasitic light also can as the shading means.As an example, expression has and as the side example of shading means 11,12 is set respectively at the 1st lens L1 and the 2nd lens L2 in Fig. 1.In addition, each that the shading means are set is not limited to example shown in Figure 1, is configured between the other lenses as required and also can.
[embodiment]
Then, the concrete numerical value embodiment to the related imaging lens system of the utility model describes.
＜embodiment 1 〉
The lens profile figure of the imaging lens system that embodiment 1 is related is shown in Figure 2.The related imaging lens system of embodiment 1 according to from object side successively and preceding group of GF by lens L11 and lens L12 form, back group GR is made of by 4 groups 4 the mode integral body that lens L21 and lens L22 form.
The lens data of the imaging lens system that embodiment 1 is related is shown in table 1, and aspherical surface data is shown in table 2, and various data are shown in table 3.In addition, comprise also that at table 1 lens data expression has aperture diaphragm St and optics PP, this point to embodiment described later too.And the mark meaning in following table 1～table 3 to embodiment described later too.
[table 1]
| Si | Ri | | Ndj | Vdj | |
| 1 | 20.65 | 1.75 | 1.7725 | 49.6 | |
| 2 | 6.19 | 2.62 | |||
| 3* | 8.92 | 1.43 | 1.5316 | 55.4 | |
| ◎4* | 0.87 | 1.06 | |||
| ◎5* | 1.57 | 2.48 | 1.6140 | 25.5 | |
| 6* | 13.06 | 0.65 | |||
| 7 (aperture diaphragms) | ∞ | 0.18 | |||
| 8* | 11.00 | 2.15 | 1.5316 | 55.4 | |
| 9* | -1.13 | 1.00 | |||
| 10 | ∞ | 0.30 | 1.5231 | 54.5 | |
| 11 | ∞ | 0.84 | |||
| Image planes | ∞ |
[table 2]
[table 3]
In the lens data of table 1, Si represents to lean on most the face of the inscape of object side to be made as the 1st, according to towards the i that increases successively as side (i=1,2,3 ...) the face number.That is, will lean on the object side to be called the 1st most, along with towards be called the 2nd, the 3rd successively as side ...
The Ri of table 1 represents the radius-of-curvature of i (i=1,2,3) face, Di represent i (i=1,2,3 ...) on the optical axis Z of face and i+1 face face at interval.And, Ndj represent on the hurdle to lean on most the optical parameter of object side be made as the 1st and according to towards the j that increases successively as side (j=1,2,3 ...) refractive index to the d line of optical parameter, vdj 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, just be made as during towards object side protruding, with protruding towards as side the time, be made as negative.
In the lens data of table 1, at the additional ◎ of dark aspheric number of curved surface.In the related imaging lens system of embodiment 1, dark curved surface aspheric surface is the picture side of lens L12, and is the object side of lens L21.
In the lens data of table 1, aspheric surface is represented to have the numerical value of paraxial radius-of-curvature at the additional * seal of face number as the aspheric curvature radius.The aspherical surface data of table 2 is expression asphericity coefficients about these aspheric each faces.Asphericity coefficient be in order to each COEFFICIENT K of the aspheric surface formula of following formula (A) expression, Bm (m=3,4,5 ...) value.
Zd＝C·h
2/{1+(1-(K·C
2·h
2)
1/2}+∑B
m·h
m……(A)
Herein,
Zd: the aspheric degree of depth length of perpendicular of tangent and vertical with optical axis plane, aspheric surface summit (point on the aspheric surface of height h hang down)
H: highly (distance from the optical axis to the lens face)
C: the inverse number of paraxial radius-of-curvature
K, B
m: asphericity coefficient (m=3,4,5 ...)
In table 3, Fno. is the F value, L be from total system (rear cut-off distance is divided into air and converts by the object side of the object side lens distance to the optical axis Z of image planes, the mm of unit), Bf is the rear cut-off distance (mm of unit) that air converts, and f is the focal length (mm of unit) of total system, f
1For depending on most the focal length (mm of unit) of the lens (being lens L11 in the present embodiment) of object side, f
2Be the focal length (mm of unit) from the 2nd lens of object side (being lens L12 in the present embodiment), f
3Be the focal length (mm of unit) from the 3rd lens of object side (being lens L21 in the present embodiment), f
4Be the focal length (mm of unit) from the 4th lens of object side (being lens L22 in the present embodiment), 2 ω are full visual angle (unit is degree).
And θ X3, θ X4, θ X5, θ X6, θ X8, θ X9 are respectively the acute angle (unit is degree) that the lens face tangent line of point of the 3rd, the 4th, the 5th, the 6th, the 8th, the 9th effective diameter end is become with optical axis.To embodiment described later too, θ Xi (i is identical with above-mentioned number i, i=1,2,3 ...) be the acute angle (unit is degree) that the lens face tangent line of point of the effective diameter end of i face is become with optical axis.
＜embodiment 2 〉
The lens profile figure of the imaging lens system that embodiment 2 is related is shown in Figure 3.The related imaging lens system of embodiment 2 according to from object side in turn before group GF by lens L11 and lens L12 form, back group GR is made of with 4 groups 4 the mode integral body that lens L21 and lens L22 form.The lens data of the imaging lens system that embodiment 2 is related is illustrated in table 4, and aspherical surface data is illustrated in table 5, and various data are illustrated in table 6.In the related imaging lens system of embodiment 2, dark curved surface aspheric surface is the picture side of lens L12, the object side of lens L21, the picture side of lens L22.
[table 4]
| Si | Ri | Di | | V dj | |
| 1 | 20.81 | 1.62 | 1.7725 | 49.6 | |
| 2 | 5.90 | 2.33 | |||
| 3* | 4.19 | 1.43 | 1.5316 | 55.4 | |
| ◎4* | 1.69 | 1.13 | |||
| ◎5* | 5.50 | 2.43 | 1.6140 | 25.5 | |
| 6* | 25.57 | 0.65 | |||
| 7 (aperture diaphragms) | ∞ | 0.22 | |||
| 8* | 198.27 | 2.15 | 1.5316 | 55.4 | |
| ◎9* | -0.91 | 1.00 | |||
| 10 | ∞ | 0.30 | 1.5231 | 54.5 | |
| 11 | ∞ | 1.22 | |||
| Image planes | ∞ |
[table 5]
[table 6] embodiment 2 various data
＜embodiment 3 〉
The lens profile figure of the imaging lens system that embodiment 3 is related is shown in Figure 4.The related imaging lens system of embodiment 3 according to from object side in turn before group GF become 3 groups 3 small-sized on the whole by the mode that lens L11 forms, back group GR is formed by lens L21 and lens L22 and constitute.The lens data of the imaging lens system that embodiment 3 is related is illustrated in table 7, and aspherical surface data is illustrated in table 8, and various data are illustrated in table 9.In the related imaging lens system of embodiment 3, the picture side of the object side that dark curved surface aspheric surface is lens L21, lens L22.
[table 7] embodiment 3 lens datas
| Si | Ri | Di | | V dj | |
| 1 | 37.83 | 1.65 | 1.7725 | 49.6 | |
| 2 | 3.96 | 3.89 | |||
| ◎3* | 4.99 | 2.33 | 1.6140 | 25.5 | |
| 4* | 2.14 | 0.60 | |||
| 5 (aperture diaphragms) | ∞ | 0.40 | |||
| 6* | 7.14 | 2.18 | 1.5316 | 55.4 | |
| ◎7* | -1.17 | 1.00 | |||
| 8 | ∞ | 0.30 | 1.5231 | 54.5 | |
| 9 | ∞ | 1.74 | |||
| Image planes | ∞ |
[table 8]
[table 9]
＜embodiment 4 〉
The lens profile figure of the imaging lens system that embodiment 4 is related is shown in Figure 5.The related imaging lens system of embodiment 4 according to from object side in turn before group GF by the mode that lens L11 and lens L12 form, back group GR is formed by lens L21, lens L22, lens L23, whole with 5 groups of 5 formations.The lens data of the imaging lens system that embodiment 4 is related is illustrated in table 10, and aspherical surface data is illustrated in table 11, and various data are illustrated in table 12.In the related imaging lens system of embodiment 4, dark curved surface aspheric surface is the picture side of lens L22.
[table 10]
| Si | Ri | Di | | V dj | |
| 1 | 19.51 | 1.26 | 1.7725 | 49.6 | |
| 2 | 4.92 | 2.43 | |||
| 3* | 2.53 | 1.20 | 1.5316 | 55.4 | |
| 4* | 0.84 | 0.95 | |||
| 5* | 2.36 | 2.90 | 1.6140 | 25.5 | |
| 6* | -53.66 | 0.68 | |||
| 7 (aperture diaphragms) | ∞ | 0.22 | |||
| 8* | 48.85 | 2.00 | 1.5316 | 55.4 | |
| ◎9* | -0.69 | 0.22 | |||
| 10* | -0.68 | 0.92 | 1.6140 | 25.5 | |
| 11* | -1.20 | 0.39 | |||
| 12 | ∞ | 0.30 | 1.5231 | 54.5 | |
| 13 | ∞ | 1.51 | |||
| Image planes | ∞ |
[table 11]
[table 12] embodiment 4 various data
＜embodiment 5 〉
The lens profile figure of the imaging lens system that embodiment 5 is related is shown in Figure 6.Embodiment 5 related imaging lens systems are formed, are afterwards organized the mode that GR is formed by lens L21 and lens L22 by lens L11 according to organizing GF in turn from object side, and integral body becomes 3 groups 3 small-sized formation.The lens data of the imaging lens system that embodiment 5 is related is illustrated in table 13, and aspherical surface data is illustrated in table 14, and various data are illustrated in table 15.In the related imaging lens system of embodiment 5, dark curved surface aspheric surface is the picture side of lens L11.
[table 13] embodiment 5 lens datas
| Si | Ri | Di | | V dj | |
| 1* | 211.17 | 1.21 | 1.5087 | 56 | |
| ◎2* | 0.91 | 1.63 | |||
| 3* | 1.52 | 1.50 | 1.5836 | 30.2 | |
| 4* | -6.00 | 0.54 | |||
| 5 (aperture diaphragms) | ∞ | 0.54 | |||
| 6* | -60.80 | 1.94 | 1.5087 | 56 | |
| 7* | -2.30 | 0.50 | |||
| 8 | ∞ | 0.50 | 1.5168 | 64.2 | |
| 9 | ∞ | 1.02 | |||
| Image planes | ∞ |
[table 14]
[table 15] embodiment 5 various data
＜embodiment 6 〉
The lens profile figure of the imaging lens system that embodiment 6 is related is shown in Figure 7.The related imaging lens system of embodiment 6 according to from object side in turn before group GF by the mode that lens L11 and lens L12 form, back group GR is formed by lens L21 and lens L22, whole with 4 groups of 4 formations.The lens data of the imaging lens system that embodiment 6 is related is illustrated in table 16, and aspherical surface data is illustrated in table 17, and various data are illustrated in table 18.In the related imaging lens system of embodiment 6, dark curved surface aspheric surface is the picture side of lens L12, the object side of lens L21.
[table 16] embodiment 6 lens datas
| Si | Ri | Di | | V dj | |
| 1 | 19.94 | 1.96 | 1.7725 | 49.6 | |
| 2 | 6.57 | 2.57 | |||
| 3* | 7.99 | 1.43 | 1.600 | 50.5 | |
| ◎4* | 0.91 | 1.07 | |||
| ◎5* | 1.61 | 2.34 | 1.652 | 21.0 | |
| 6* | 9.58 | 0.65 | |||
| 7 (aperture diaphragms) | ∞ | 0.18 | |||
| 8* | 11.41 | 2.15 | 1.600 | 50.5 | |
| 9* | -1.24 | 1.00 | |||
| 10 | ∞ | 0.30 | 1.5231 | 54.5 | |
| 11 | ∞ | 0.83 | |||
| Image planes | ∞ |
[table 17]
Embodiment 6 aspherical surface datas
[table 18]
In the value of table 19 expression corresponding to conditional (1)～(6) of the imaging lens system of embodiment 1～6.But only represent relevant embodiment's (4) for conditional (5).As known from Table 19, embodiment 1～6 all satisfy condition formula (1)～(4), (6), embodiment 4 formula (5) that also satisfies condition.
[table 19]
The aberration diagram of representing the spherical aberration of the imaging lens system that the foregoing description 1 is related, astigmatic aberration, distortion (distortion aberration), multiplying power chromatic aberation at Fig. 8 (A), Fig. 8 (B), Fig. 8 (C), Fig. 8 (D) respectively.Represent with the d line to be the aberration of reference wavelength at each aberration diagram, but also represent aberration for F line (wavelength 486.1nm), C line (wavelength 656.3nm) at spherical aberration diagram and multiplying power chromatic aberation figure.The figure of distortion, (use parameter, 0≤θ≤ω), desirable image height is made as 2f * tan (θ/2) represents the side-play amount apart from it for the focal distance f of use total system, half angle of view θ.The Fno. of spherical aberration diagram is the F value, and the ω of other aberration diagrams represents half angle of view.And, similarly represent the aberration diagram of the spherical aberration of the imaging lens system that the foregoing description 2,3,4,5,6 is related, astigmatic aberration, distortion (distortion aberration), multiplying power chromatic aberation respectively at Fig. 9 (A)～Fig. 9 (D), Figure 10 (A)～Figure 10 (D), Figure 11 (A)～Figure 11 (D), Figure 12 (A)～Figure 12 (D), Figure 13 (A)～Figure 13 (D).From each aberration diagram as can be known, can proofread and correct each aberration of the foregoing description 1～6 well.
That is, the imaging lens system of embodiment 1～6 is with 3～5 less lens number and small-sized formation, and realizes that full visual angle is the optical system of 111 °～191.4 ° extremely wide-angle, and has the good optical performance.The imaging lens system of embodiment 1～6 that possesses these advantages is applicable to the vehicle mounted camera of reflections such as be used to photograph vehicle front, side, rear etc.
At Figure 14 as making use-case be illustrated in the appearance that automobile 100 loads the camera head of the imaging lens system that possesses present embodiment.In Figure 14, automobile 100 possesses and has: the outer camera 101 of the car of its codriver's seat side side dead range that is used to make a video recording; The outer camera 102 of car of rear side dead range of automobile 100 is used to make a video recording; Be installed in the rearview mirror back side, camera 103 in the car of the field range identical that be used to photograph with the driver.Camera 103 is the related camera heads of present embodiment in the outer camera 101 of car, the outer camera 102 of car, the car, possesses with good grounds embodiment imaging lens system of the present utility model and the formed optical image of this imaging lens system is transformed into the imaging apparatus 5 of electric signal.
The related imaging lens system of embodiment of the present utility model has above-mentioned advantage, so outer camera 101,102 of car and the interior camera 103 of car also can constitute small-sized, and have wide view angle, can be at the good picture of the shooting surface imaging of its imaging apparatus 5.
More than, for example embodiment and embodiment and the utility model has been described, but the utility model is not limited to above-mentioned embodiment and embodiment, can carry out all distortion.For example, the radius-of-curvature of each lens composition, face interval and refractive index value are not limited in the value shown in above-mentioned each numerical value embodiment, are the values of getting other.
And, in the embodiment of camera head, for the example that the utility model is applicable to the vehicle mounted camera, illustrate and be illustrated, but the utility model is not limited thereto purposes, for example also applicable to used for mobile terminal camera or monitor camera etc.
Claims (7)
1. an imaging lens system is characterized in that,
Form by having preceding group of negative power and having back group of positive light coke successively from object side,
And has the acute angle that is become with optical axis according to tangent line and is the aspheric surface that mode below 30 ° comprises afore mentioned rules point at the regulation point in the effective field of lens face.
2. imaging lens system according to claim 1 is characterized in that,
Group is negative lens by the lens of object side before above-mentioned,
Above-mentioned back group comprises diaphragm and at least 2 lens.
3. imaging lens system according to claim 1 and 2 is characterized in that,
Group is formed by the 1st negative lens and the 2nd negative lens successively from object side before above-mentioned,
Above-mentioned back group is formed by the 3rd positive lens, diaphragm and the 4th positive lens successively from object side.
4. imaging lens system according to claim 1 and 2 is characterized in that,
Group is formed by the 1st negative lens and the 2nd negative lens successively from object side before above-mentioned,
Above-mentioned back group is formed by the 3rd positive lens, diaphragm, positive the 4th lens and the 5th lens of plus or minus successively from object side.
5. imaging lens system according to claim 1 and 2 is characterized in that,
Group has the aspheric surface that comprises afore mentioned rules point before above-mentioned.
6. imaging lens system according to claim 1 and 2 is characterized in that,
Above-mentioned back group has the aspheric surface that comprises afore mentioned rules point.
7. a camera head is characterized in that, possesses each described imaging lens system of claim 1～6.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2008173137A JP2010014855A (en) | 2008-07-02 | 2008-07-02 | Imaging lens and imaging apparatus |
| JP2008173137 | 2008-07-02 |
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| Publication Number | Publication Date |
|---|---|
| CN201340474Y true CN201340474Y (en) | 2009-11-04 |
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|---|---|---|---|
| CNU200820176100XU Expired - Lifetime CN201340474Y (en) | 2008-07-02 | 2008-10-30 | Image pick-up lens and image pick-up device |
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| Country | Link |
|---|---|
| JP (1) | JP2010014855A (en) |
| CN (1) | CN201340474Y (en) |
| TW (1) | TWM355384U (en) |
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| US11768355B2 (en) | 2019-09-11 | 2023-09-26 | Sintai Optical (Shenzhen) Co., Ltd. | Wide-angle lens assembly including six lenses of -+-++-refractive powers, or five lenses of --++-refractive powers |
| CN111929824A (en) * | 2020-09-03 | 2020-11-13 | 瑞声光电科技（苏州）有限公司 | Image pickup optical lens |
| CN111929824B (en) * | 2020-09-03 | 2021-03-09 | 诚瑞光学(苏州)有限公司 | Image pickup optical lens |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2010014855A (en) | 2010-01-21 |
| TWM355384U (en) | 2009-04-21 |
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| TR01 | Transfer of patent right |
Effective date of registration: 20181012 Address after: Tokyo, Japan Patentee after: Fuji Film Corp. Address before: Japan's Saitama Prefecture Patentee before: Fujinon Corp. |
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