CN101430416A - Imaging lens having three-lens configuration, camera module, and portable terminal equipment - Google Patents
Imaging lens having three-lens configuration, camera module, and portable terminal equipment Download PDFInfo
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Abstract
An imaging lens includes: in order from an object side, an aperture diaphragm; a first lens of a positive lens having a convex surface on the object side; a second lens of a meniscus lens having a concave surface on the object side; and a third lens. The imaging lens satisfies: f/f 3 <0.95 and BR 2 <0. BR 2 satisfies BR 2 =A/D 4 , A represents a distance from a vertex position on a object-side surface of the second lens and on an optical axis to a position on a image-side surface of the second lens through which a light ray passes toward a corner of an image height, provided that a traveling direction of the light ray is taken as appositive direction, and D 4 represents a center thickness of the second lens. f represents a focal length of the imaging lens. f 3 represents a focal length of the third lens.
Description
Technical field
The present invention relates to a kind of on CCD (Charge Coupled Device) or CMOS imaging apparatuss such as (Complementary Metal Oxide Semiconductor) imaging lens system of the optical image of imaging subject, and will be transformed into the camera module of image pickup signal, and load this imaging lens system and the mobile phone or the personal digital assistant suitable fixed-focus imaging lens systems such as (PDA:Personal Digital Assistance) of the band camera of photographing by the optical image that this imaging lens system forms.
Background technology
In recent years, the extremely miniaturization of the imaging apparatus of CCD or CMOS etc. and high pixelation are in development.Therefore, the picture pick-up device body, and the lens that are loaded into it also require small-sized and high-performance.And, for the imaging apparatus of the high pixel of correspondence, also require telecentric iris (telecentric), that is, chief ray approaches parallel (incident angle of shooting face is almost zero with respect to the normal of shooting face) with respect to the incident angle of optical axis direction imaging apparatus.In the past, the lens (with reference to patent documentation 1 to 9) of 3 formations have been developed as small-sized imaging lens system.Record imaging lens system between the 1st lens and the 2nd lens configuration aperture diaphragm, that diaphragm constitutes in the what is called at patent documentation 1,2 and patent documentation 3 (embodiment 1).Yet, under the situation of the formation of middle diaphragm,, become greatly at the incident angle of the chief ray of shooting face if will shorten the total length of lens system, thus the telecentric iris variation.Therefore, in order to ensure the telecentric iris consideration aperture diaphragm is configured in the way of object side.In patent documentation 3 (embodiment 2) and patent documentation 4 and even 9, record the imaging lens system that aperture diaphragm is configured in 3 formations of object side.
2003-No. 322792 communiques of [patent documentation 1] patent disclosure
2005-No. 352317 communiques of [patent documentation 2] patent disclosure
2005-No. 17440 communiques of [patent documentation 3] patent disclosure
2005-No. 292235 communiques of [patent documentation 4] patent disclosure
2005-No. 345919 communiques of [patent documentation 5] patent disclosure
2004-No. 4566 communiques of [patent documentation 6] patent disclosure
2004-No. 226487 communiques of [patent documentation 7] patent disclosure
2004-No. 240063 communiques of [patent documentation 8] patent disclosure
2006-No. 47858 communiques of [patent documentation 9] patent disclosure
Summary of the invention
Yet, follow the high pixelation of imaging apparatus, wish the lens that exploitation has higher optical property.Especially the hope exploitation is a kind of not only seeks miniaturization, and proofreaies and correct the imaging lens system of curvature of the image or chromatic aberation well.And, when aperture diaphragm being configured in the most close object side, having and make inhomogeneous sensitivity (the intensity of variation optical property that causes) and become big tendency by making inhomogeneous, have and can not mass-producedly be inclined to.Thereby wishing to develop is configured in aperture diaphragm the most close object side and guarantees telecentric iris, suppresses to make the imaging lens system of inhomogeneous sensitivity simultaneously.
The present invention is in view of forming as above-mentioned problem points, and its purpose is, a kind of imaging lens system that can proofread and correct small-sized and high performance 3 formations of all aberrations corresponding to high pixelation well is provided.
The imaging lens system of 3 formations that the 1st viewpoint of the present invention is related is equipped with aperture diaphragm, the 1st lens, the 2nd lens, the 3rd lens successively from object side.And the 1st lens are by forming the positive lens of convex surface towards object side, and the 2nd lens are by forming the meniscus shaped lens of concave surface towards object side, and satisfy following conditional.
f/f3<0.95……(1)
BR2<0……(2)
Wherein, BR2 is made as radiation direction just, will be from the optical axis vertex position P1 of the 2nd lens front surface to the distance till the position P2 that the light at image height angle passes through be A in the 2nd lens rear surface, and when the center thickness of the 2nd lens is D4, BR2=A/D4.And f is the focal length of complete set, and f3 is the focal length of the 3rd lens.
In the related imaging lens system of the 1st viewpoint of the present invention, with 3 such minority lens numbers, suitably constitute each lens, thereby seek miniaturization and high performance by integral body.Especially, because aperture diaphragm is provided in the object side of the 1st lens, so, the shorteningization of total length and telecentric iris be chief ray to the shooting face incident angle become easily near vertical (parallel) to optical axis, in the optical property of the characteristic that can obtain to help imaging apparatus.And especially by the formula of satisfying condition (2), at periphery, the rear surface of the 2nd lens is positioned at more close object side than the optical axis vertex position P1 of front surface.Thus, can make the ejaculation angle of light become the obtuse angle, mainly contain to be beneficial to and proofread and correct curvature of the image and distortion aberration.And by the formula of satisfying condition (1), the optical power of the 3rd lens is optimized, and mainly contains to be beneficial to proofread and correct curvature of the image or chromatic aberation.Thus, can obtain high optical property corresponding to high pixelation.
In the related imaging lens system of the 1st viewpoint of the present invention,, preferably suitably satisfy following condition in order to obtain good optical performance or better manufacturing applicability more.
0.22<(D3+D4)/f<0.43……(3)
Wherein, f is the focal length of complete set, and D3 is the face interval on optical axis of the 1st lens rear surface and the 2nd lens front surface, and D4 is the center thickness of the 2nd lens.
υ d2〉40 and ,-1.2＜f3/f＜0.0 ... (4)
Wherein, υ d2 is the Abbe number of the 2nd lens, and f is the focal length of complete set, and f3 is the focal length of the 3rd lens.
υ d2〉40 and, 0.0＜f2/f＜2.0 ... (5)
Wherein, υ d2 is the Abbe number of the 2nd lens, and f is system-wide focal length, and f2 is the focal length of the 2nd lens.
The imaging lens system of 3 formations that the 2nd viewpoint of the present invention is related is equipped with aperture diaphragm, the 1st lens, the 2nd lens, the 3rd lens successively from object side.And the 1st lens are by forming the positive lens of convex surface towards object side, and the 2nd lens are by forming the lens of concave surface towards object side, and satisfy following conditional.
f/f3<0.95……(1)
D4/f<0.136……(6)
Wherein, D4 is the center thickness of the 2nd lens, and f is system-wide focal length, and f3 is the focal length of the 3rd lens.
In the related imaging lens system of the 2nd viewpoint of the present invention,, suitably constitute each lens, and can seek miniaturization and high performance by the minority lens number of integral body with 3.Especially, because aperture diaphragm is equipped on the object side of the 1st lens, so, the shorteningization of carrying out total length easily and telecentric iris be chief ray to the shooting face incident angle approach vertically (parallel) with respect to optical axis, thereby can obtain to help the optical property of imaging apparatus characteristic.And especially, by the formula of satisfying condition (6), the center thickness of the 2nd lens becomes less, is easy to definitely keep the ejaculation angle of light, thereby keep good resolution performance.And, can be than being easier to dwindle total length with making inhomogeneous sensitivity inhibition for little state.And, also can suppress fee of material.And by the formula of satisfying condition (1), the optical power of the 3rd lens is optimized, and mainly contains the correction that is beneficial to curvature of the image or chromatic aberation.Thus, can obtain high optical property corresponding to high pixelation.
The related imaging lens system of the 2nd viewpoint of the present invention in order to obtain good optical performance or better manufacturing applicability more, preferably suitably satisfies following condition.
0.22<(D3+D4)/f<0.43……(3)
Wherein, f is system-wide focal length, and D3 is the face interval on optical axis of the 1st lens rear surface and the 2nd lens front surface, and D4 is the center thickness of the 2nd lens.
υ d2〉40 and, (D4+D6)/f＜0.31 ... (7)
Wherein, υ d2 is the Abbe number of the 2nd lens, and f is system-wide focal length, and D4 is the center thickness of the 2nd lens, and D6 is the center thickness of the 3rd lens.
D6/f≦0.155……(8)
Wherein, f is system-wide focal length, and D6 is the center thickness of the 3rd lens.
F3/f＜-0.4, and-5.6＜f2/f＜-3.3 ... (10)
Wherein, f2 is the focal length of the 2nd lens.
υ d2〉40, and 1.2＜f3/f＜0.0 ... (4)
Wherein, υ d2 is the Abbe number of the 2nd lens of d line.
F3/f＜-1.66 and, 0.1＜| f1/f2|＜0.5 ... (11)
Wherein, f1 is the focal length of the 1st lens, and f2 is the focal length of the 2nd lens.
—0.5<f1/f2<—0.1……(11)”
Wherein, f1 is the focal length of the 1st lens, and f2 is the focal length of the 2nd lens.
The imaging lens system of 3 formations that the 3rd viewpoint of the present invention is related is equipped with aperture diaphragm, the 1st lens, the 2nd lens, the 3rd lens successively from object side.And the 1st lens are by forming the positive lens of convex surface towards object side, and the 2nd lens are by forming the lens of concave surface towards the positive refracting power of having of object side, and satisfy following conditional.
0.22<(D3+D4)/f<0.43……(3)
0<f2/f<1……(9)
Wherein, f is the focal length of complete set, and f2 is the focal length of the 2nd lens, and D3 is the face interval on optical axis of the 1st lens rear surface and the 2nd lens front surface, and D4 is the center thickness of the 2nd lens.
In the related imaging lens system of the 3rd viewpoint of the present invention,, suitably constitute each lens, and can seek miniaturization and high performance by the minority lens number of integral body with 3.Especially, because aperture diaphragm is equipped on the object side of the 1st lens, so the shorteningization that is easy to carry out total length and telecentric iris are chief ray to the incident angle of shooting face near vertical (parallel with respect to optical axis), thereby can obtain to help the optical property of imaging apparatus characteristic.And especially,, when can suppress total length, easily suitably keep the ejaculation angle of light by the formula of satisfying condition (3), also help the correction curvature of the image.And by the formula of satisfying condition (9), the optical power of the 2nd lens is optimized, and mainly contains to be beneficial to proofread and correct curvature of the image or distortion aberration.Thus, can obtain high optical property corresponding to high pixelation.
In the related imaging lens system of the 3rd viewpoint of the present invention,, preferably satisfy following condition in order to obtain good optical performance more.
υ d2〉40 and ,-1.2＜f3/f＜0.0 ... (4)
Wherein, υ d2 is the Abbe number of the 2nd lens, and f is system-wide focal length, and f3 is the focal length of the 3rd lens.
In the imaging lens system of 3 formations that the 4th viewpoint of the present invention is related, be equipped with aperture diaphragm, the 1st lens, the 2nd lens, the 3rd lens successively from object side.And the 1st lens are by forming the positive lens of convex surface towards object side, and the 2nd lens are by forming concave surface towards object side and lens with negative refracting power, and the 3rd lens are formed by the lens with negative refracting power, and satisfy following conditional.
0.22<(D3+D4)/f<0.43……(3)
F3/f＜-0.4 and ,-5.6＜f2/f＜-3.3 ... (10)
Herein, f is the focal length of complete set, and f2 is the focal length of the 2nd lens, and f3 is the focal length of the 3rd lens, and D3 is the face interval on optical axis of the 1st lens rear surface and the 2nd lens front surface, and D4 is the center thickness of the 2nd lens.
In the related imaging lens system of the 4th viewpoint of the present invention,, suitably constitute each lens, and can seek miniaturization and high performance by the minority lens number of integral body with 3.Especially, because aperture diaphragm is provided in the object side of the 1st lens, so the shorteningization that is easy to carry out total length and telecentric iris are chief ray to the incident angle of shooting face near vertical (parallel with respect to optical axis), thereby can obtain to help the optical property of imaging apparatus characteristic.And, suitably keep the ejaculation angle of light when can easily suppress total length especially by the formula of satisfying condition (3), also help the correction curvature of the image.And by the formula of satisfying condition (10), the optical power balance of the 2nd lens and the 3rd lens is optimized, and helps proofreading and correct all aberrations.Thus, can obtain high optical property corresponding to high pixelation.
The imaging lens system of 3 formations that the 5th viewpoint of the present invention is related is equipped with aperture diaphragm, the 1st lens, the 2nd lens, the 3rd lens successively from object side.And the 1st lens are by forming the positive lens of convex surface towards object side, and the 2nd lens are by forming the lens of concave surface towards object side, and the 3rd lens are formed by the lens with negative refracting power, and satisfy following conditional.
0.22<(D3+D4)/f<0.43……(3)
F3/f＜-1.66 and, 0.1＜| f1/f2|＜0.5 ... (11)
Herein, f is the focal length of complete set, and f1 is the focal length of the 1st lens, and f2 is the focal length of the 2nd lens, and f3 is the focal length of the 3rd lens, and D3 is the face interval on optical axis of the 1st lens rear surface and the 2nd lens front surface, and D4 is the center thickness of the 2nd lens.
In the related imaging lens system of the 5th viewpoint of the present invention,, suitably constitute each lens, and can seek miniaturization and high performance by the minority lens number of integral body with 3.Especially, because aperture diaphragm is equipped on the object side of the 1st lens, so the shorteningization that is easy to carry out total length and telecentric iris are chief ray to the incident angle of shooting face near vertical (parallel with respect to optical axis), thereby can obtain to help the optical property of imaging apparatus characteristic.And, be easy to when suppressing total length, suitably keep the ejaculation angle of light especially by the formula of satisfying condition (3), also help the correction curvature of the image.And by the formula of satisfying condition (11), the optical power balance of the 1st lens, the 2nd lens and the 3rd lens is optimized, and helps proofreading and correct all aberrations.Thus, can obtain high optical property corresponding to high pixelation.
The imaging lens system of 3 formations that the 6th viewpoint of the present invention is related is equipped with aperture diaphragm, the 1st lens, the 2nd lens, the 3rd lens successively from object side.And the 1st lens are by forming the positive lens of convex surface towards object side, and the 2nd lens are by forming the lens of concave surface towards object side, and satisfy following conditional.
—0.85<f2/{f3·(45—υd2)}<—0.13……(12)
Herein, υ d2 is the Abbe number of the 2nd lens, and f2 is the focal length of the 2nd lens, and f3 is the focal length of the 3rd lens.
In the related imaging lens system of the 6th viewpoint of the present invention, with 3 so less lens numbers, suitably constitute each lens, and can seek miniaturization and high performance by integral body.Especially, because aperture diaphragm is provided in the object side of the 1st lens, so the shorteningization that is easy to carry out total length and telecentric iris are chief ray to the incident angle of shooting face near vertical (parallel with respect to optical axis), thereby can obtain to help the optical property of imaging apparatus characteristic.And especially, by the formula of satisfying condition (12), suitably control the 2nd lens and the optical power of the 3rd lens and the dispersion of the 2nd lens can reduce the skew when making and the image planes change that takes place, thereby can obtain to make the outstanding lens system of applicability when reducing chromatic aberation.Thus, can obtain high optical property corresponding to high pixelation.
In the related shooting head mirror of the 6th viewpoint of the present invention, in order to obtain good optical performance more, or better manufacturing adaptability, suitably satisfying following condition be ideal.
BR2<0……(2)
Herein, BR2 is made as radiation direction just, will be from the optical axis vertex position P1 of the 2nd lens front surface to the distance till the position P2 that the light at image height angle passes through be made as A in the 2nd lens rear surface, and when penetrating the center thickness of the 2nd lens into D4, BR2=A/D4.
0.22<(D3+D4)/f<0.43……(3)
D6/f≦0.155……(8)
Herein, f is system-wide focal length, and D3 is the face interval on optical axis of the 1st lens rear surface and the 2nd lens front surface, and D4 is the center thickness of the 2nd lens, and D6 is the center thickness of the 3rd lens.
D4/f<0.136……(6)
Herein, f is system-wide focal length, and D4 is the center thickness of the 2nd lens.
The imaging lens system of 3 formations that the 7th viewpoint of the present invention is related, from object side be equipped with aperture diaphragm successively, have positive refracting power the 1st lens, have positive refracting power the 2nd lens, have the 3rd lens of negative refracting power.And, when the 3rd lens, the face of object side are concave shape near optical axis, are convex form as the face of side at periphery, and satisfy following conditional.
f/R6<—0.4……(13)
Herein, R6 is the paraxial radius-of-curvature of face of the object side of the 3rd lens, and f is system-wide focal length.
In the related imaging lens system of the 7th viewpoint of the present invention,, suitably constitute each lens, and can seek miniaturization and high performance by the minority lens number of integral body with 3.Especially, because aperture diaphragm is provided in the object side of the 1st lens, so the shorteningization that is easy to carry out total length and telecentric iris are chief ray to the incident angle of shooting face near vertical (parallel with respect to optical axis), thereby can obtain to help the optical property of imaging apparatus characteristic.And especially be configured in the shape of the 3rd lens of the face side of making a video recording most by optimization, can when proofreading and correct curvature of the image and distortion aberration well, easily guarantee telecentric iris.Thus, can obtain high optical property corresponding to high pixelation.
In the related imaging lens system of the 7th viewpoint of the present invention,, preferably satisfy following condition in order to obtain good optical performance more.
—1.2<f3/f<0.0……(14)
Herein, f is the focal length of complete set, and f3 is the focal length of the 3rd lens.
0.22<(D3+D4)/f<0.43……(3)
Wherein, D3 is the face interval on optical axis of the 1st lens rear surface and the 2nd lens front surface, and D4 is the center thickness of the 2nd lens.
0<f2/f<1……(9)
Wherein, f2 is the focal length of the 2nd lens.
υ d2〉40 and ,-1.2＜f3/f＜0.0 ... (4)
Wherein, υ d2 is the Abbe number of the 2nd lens of d line, and f3 is the focal length of the 3rd lens.
The imaging lens system of 3 formations that the 8th viewpoint of the present invention is related, from object side be equipped with aperture diaphragm successively, have positive refracting power the 1st lens, have positive refracting power the 2nd lens, have the 3rd lens of negative refracting power.And, satisfy following conditional.
D4/f<0.136……(6)
—0.85<f2/{f3·(45—υd2)}<—0.13……(12)
-2.5＜f/f3＜0.0 and, 0.5＜f2/f ... (15)
Herein, D4 is the center thickness of the 2nd lens, and υ d2 is the Abbe number of the 2nd lens, and f is the focal length of complete set, and f2 is the focal length of the 2nd lens, and f3 is the focal length of the 3rd lens.
In the related imaging lens system of the 8th viewpoint of the present invention,, suitably constitute each lens, and can seek miniaturization and high performance by the minority lens number of integral body with 3.Especially, because aperture diaphragm is provided in the object side of the 1st lens, so the shorteningization that is easy to carry out total length and telecentric iris are chief ray to the incident angle of shooting face near vertical (parallel with respect to optical axis), thereby can obtain to help the optical property of imaging apparatus characteristic.And especially, by the formula of satisfying condition (6), the center thickness of the 2nd lens becomes smaller, and guarantees definitely easily the ejaculation angle of light to keep good resolution performance.And, can be to dwindle total length with comparalive ease under the less state making inhomogeneous sensitivity inhibition.And, also can suppress fee of material.And, by the formula of satisfying condition (12), the dispersion that can suitably control the optical power of the 2nd lens and the 3rd lens and the 2nd lens reduces chromatic aberation, and reduces the skew when making and the image planes change that takes place, thereby can obtain to make the outstanding lens system of applicability.Further, by the formula of satisfying condition (15), the optical power balance of the 2nd lens and the 3rd lens is optimized, and helps proofreading and correct all aberrations.Thus, can obtain high optical property corresponding to high pixelation.
In the imaging lens system of 3 related formations of each viewpoint of the present invention, the 1st lens, the 2nd lens and the 3rd lens are that non-spherical lens is desirable.By the aspherical shape of each lens of optimization, mainly contain to be beneficial to and proofread and correct curvature of the image and distortion aberration, can obtain good optical performance more.
For example, the face as side of the 1st lens is preferably the aspheric surface following: promptly shape object side along with advance to periphery with optical axis near compare and change.For example being preferably, is the concave shape or the shape on plane almost near optical axis, along with advancing towards periphery and becoming the such aspherical shape of convex form.
And the shape of the face of the object side of the 2nd lens is preferably following such aspheric surface: promptly shape object side along with advance to periphery with optical axis near compare and change.For example be preferably, near the optical axis for concave shape along with aspherical shape towards near the absolute value of peripheral radius-of-curvature also little concave shape than optical axis.
And the shape as the face of side of the 3rd lens is preferably, and along with advancing towards periphery, and compares near the optical axis, and shape changes to the picture side halfway, the aspherical shape that net shape changes to object side.For example being preferably, is concave shape near optical axis, becomes the big concave shape of absolute value of radius-of-curvature halfway, along with advancing to periphery and becoming the such aspherical shape of convex form.
Based on camera module of the present invention, possess by 3 imaging lens systems that constitute of the present invention and, the imaging apparatus of output and the corresponding electric signal of optical image that forms by this imaging lens system.
By camera module of the present invention, the high-resolution optical image based on being obtained by 3 imaging lens systems that constitute of the present invention can obtain high-resolution image pickup signal.
In based on mobile terminal device of the present invention, possess by camera module of the present invention.
In based on mobile terminal device of the present invention, the high-resolution optical image that obtains based on the imaging lens system that constitutes by 3 of the present invention can obtain high-resolution image pickup signal, and can obtain high-resolution image based on this image pickup signal.
The imaging lens system of 3 formations that each viewpoint according to the present invention is related, the whole formation optimization that makes each lens with 3 minority lens number, therefore, can realize having proofreaied and correct well the small-sized and high performance camera-lens system of all aberrations corresponding to high pixelation.And,, can obtain more good optical performance by satisfying suitable ideal conditions.Perhaps can obtain mass-produced manufacturing applicability.
And,, owing to having exported the corresponding image pickup signal of optical image that forms with high performance 3 imaging lens systems that constitute, thereby can obtain high-resolution image pickup signal by the invention described above according to camera module of the present invention or mobile terminal device.Especially according to mobile terminal device of the present invention,, can obtain high-resolution photographed images according to its image pickup signal.
Description of drawings
Fig. 1 is the lens profile figure corresponding to the related imaging lens system of embodiments of the invention 1.
Fig. 2 is the lens profile figure corresponding to the related imaging lens system of embodiments of the invention 2.
Fig. 3 is the lens profile figure corresponding to the related imaging lens system of embodiments of the invention 3.
Fig. 4 is the lens profile figure corresponding to the related imaging lens system of embodiments of the invention 4.
Fig. 5 is the lens profile figure corresponding to the related imaging lens system of embodiments of the invention 5.
Fig. 6 is the lens profile figure corresponding to the related imaging lens system of embodiments of the invention 6.
Fig. 7 is the lens profile figure corresponding to the related imaging lens system of embodiments of the invention 7.
Fig. 8 is the lens profile figure corresponding to the related imaging lens system of embodiments of the invention 8.
Fig. 9 is the lens profile figure corresponding to the related imaging lens system of embodiments of the invention 9.
Figure 10 is the lens profile figure corresponding to the related imaging lens system of embodiments of the invention 10.
Figure 11 is the lens profile figure corresponding to the related imaging lens system of embodiments of the invention 11.
Figure 12 is the lens profile figure corresponding to the related imaging lens system of embodiments of the invention 12.
Figure 13 is the lens profile figure corresponding to the related imaging lens system of embodiments of the invention 13.
Figure 14 (A)～(B) is the key diagram about conditional.
Figure 15 is the figure of the lens data of the related imaging lens system of expression embodiments of the invention 1, (A) represents basic lens data, (B) the relevant aspheric lens data of expression.
Figure 16 is the figure of the lens data of the related imaging lens system of expression embodiments of the invention 2, (A) represents basic lens data, (B) the relevant aspheric lens data of expression.
Figure 17 is the figure of the lens data of the related imaging lens system of expression embodiments of the invention 3, (A) represents basic lens data, (B) the relevant aspheric lens data of expression.
Figure 18 is the figure of the lens data of the related imaging lens system of expression embodiments of the invention 4, (A) represents basic lens data, (B) the relevant aspheric lens data of expression.
Figure 19 is the figure of the lens data of the related imaging lens system of expression embodiments of the invention 5, (A) represents basic lens data, (B) the relevant aspheric lens data of expression.
Figure 20 is the figure of the lens data of the related imaging lens system of expression embodiments of the invention 6, (A) represents basic lens data, (B) the relevant aspheric lens data of expression.
Figure 21 is the figure of the lens data of the related imaging lens system of expression embodiments of the invention 7, (A) represents basic lens data, (B) the relevant aspheric lens data of expression.
Figure 22 is the figure of the lens data of the related imaging lens system of expression embodiments of the invention 8, (A) represents basic lens data, (B) the relevant aspheric lens data of expression.
Figure 23 is the figure of the lens data of the related imaging lens system of expression embodiments of the invention 9, (A) represents basic lens data, (B) the relevant aspheric lens data of expression.
Figure 24 is the figure of the lens data of the related imaging lens system of expression embodiments of the invention 10, (A) represents basic lens data, (B) the relevant aspheric lens data of expression.
Figure 25 is the figure of the lens data of the related imaging lens system of expression embodiments of the invention 11, (A) represents basic lens data, (B) the relevant aspheric lens data of expression.
Figure 26 is the figure of the lens data of the related imaging lens system of expression embodiments of the invention 12, (A) represents basic lens data, (B) the relevant aspheric lens data of expression.
Figure 27 is the figure of the lens data of the related imaging lens system of expression embodiments of the invention 13, (A) represents basic lens data, (B) the relevant aspheric lens data of expression.
Figure 28 is the figure that summarizes the corresponding relation of each formation group of expression and each embodiment.
Figure 29 is the figure that summarizes the corresponding relation of expression conditional and claim item.
Figure 30 is the aberration diagram of all aberrations of the related imaging lens system of expression embodiments of the invention 1, (A) expression spherical aberration, (B) expression astigmatism, (C) expression distortion aberration.
Figure 31 is the aberration diagram of all aberrations of the related imaging lens system of expression embodiments of the invention 2, (A) expression spherical aberration, (B) expression astigmatism, (C) expression distortion aberration.
Figure 32 is the aberration diagram of all aberrations of the related imaging lens system of expression embodiments of the invention 3, (A) expression spherical aberration, (B) expression astigmatism, (C) expression distortion aberration.
Figure 33 is the aberration diagram of all aberrations of the related imaging lens system of expression embodiments of the invention 4, (A) expression spherical aberration, (B) expression astigmatism, (C) expression distortion aberration.
Figure 34 is the aberration diagram of all aberrations of the related imaging lens system of expression embodiments of the invention 5, (A) expression spherical aberration, (B) expression astigmatism, (C) expression distortion aberration.
Figure 35 is the aberration diagram of all aberrations of the related imaging lens system of expression embodiments of the invention 6, (A) expression spherical aberration, (B) expression astigmatism, (C) expression distortion aberration.
Figure 36 is the aberration diagram of all aberrations of the related imaging lens system of expression embodiments of the invention 7, (A) expression spherical aberration, (B) expression astigmatism, (C) expression distortion aberration.
Figure 37 is the aberration diagram of all aberrations of the related imaging lens system of expression embodiments of the invention 8, (A) expression spherical aberration, (B) expression astigmatism, (C) expression distortion aberration.
Figure 38 is the aberration diagram of all aberrations of the related imaging lens system of expression embodiments of the invention 9, (A) expression spherical aberration, (B) expression astigmatism, (C) expression distortion aberration.
Figure 39 is the aberration diagram of all aberrations of the related imaging lens system of expression embodiments of the invention 10, (A) expression spherical aberration, (B) expression astigmatism, (C) expression distortion aberration.
Figure 40 is the aberration diagram of all aberrations of the related imaging lens system of expression embodiments of the invention 11, (A) expression spherical aberration, (B) expression astigmatism, (C) expression distortion aberration.
Figure 41 is the aberration diagram of all aberrations of the related imaging lens system of expression embodiments of the invention 12, (A) expression spherical aberration, (B) expression astigmatism, (C) expression distortion aberration.
Figure 42 is the aberration diagram of all aberrations of the related imaging lens system of expression embodiments of the invention 13, (A) expression spherical aberration, (B) expression astigmatism, (C) expression distortion aberration.
Figure 43 (A)～(B) is the skeleton view of a configuration example of the related mobile terminal device of expression one embodiment of the present invention.
Figure 44 is the skeleton view of a configuration example of the related camera module of expression one embodiment of the present invention.
Among the figure: 1～camera section, 4～supporting substrate, 5～flexible base, board, 6～external connection terminals, L1～the 1st lens, L2～the 2nd lens, L3～the 3rd lens, GC～glass plate, St～aperture diaphragm, Ri～from the radius-of-curvature of object side to an i lens face, Di～from the face of several i of object side and i+1 lens face at interval, Z1～optical axis.
Embodiment
Below, the embodiment that present invention will be described in detail with reference to the accompanying.
Fig. 1 represents the 1st configuration example of the imaging lens system that 1 embodiment of the present invention is related.This configuration example is corresponding to the lens formation of the 1st numerical value embodiment described later (Figure 15 (A), Figure 15 (B)).Fig. 2～Figure 13 represents the 2nd～the 13rd configuration example.These lens corresponding to the described later the 2nd～the 13rd numerical value embodiment (Figure 16 (A), Figure 16 (B)～Figure 27 (A), Figure 27 (B)) constitute.In Fig. 1～Figure 13, symbol Ri represents, comprises aperture diaphragm St, is as No. 1 and along with the radius-of-curvature of i face of the mode diacritic that increases successively towards picture side (imaging side) with the face of the inscape of close object side.Symbol Di represent on the optical axis Z1 of i face and i+1 face face at interval.In addition, the basic comprising of each configuration example is all identical.
The related imaging lens system of present embodiment is applicable to the various picture pick-up devices of the imaging apparatus that utilizes CCD or CMOS etc., especially more small-sized mobile terminal device, for example mobile phone of digital still camera, band camera, and PDA etc.(B) as an example of mobile terminal device, the mobile phone of camera is with in expression to Figure 43 (A).The mobile phone of this band camera possesses top basket 2A and bottom basket 2B, and both are configured freely to the direction of arrow rotation of Figure 43 (A).Basket 2B is provided with operating key 21 etc. in the bottom.Be provided with camera section 1 (Figure 43 (B)) and display part 22 (Figure 43 (A)) etc. at top basket 2A.(display panel of the panel of Electro-Luminescence) etc. constitutes display part 22 by LCD (liquid crystal panel) or EL.Display part 22 is configured in the side that becomes inner face when folding.Except that the various menus that show relevant telephony feature, can also show the image of making a video recording etc. at this display part 22 by camera 1.Camera section 1 for example is configured in the rear side of top basket 2A.Herein, the position that camera section 1 is set is not limited to this.Camera section 1 has the camera module of the related imaging lens system of the present embodiment of being assembled with.
Figure 44 represents to be used in a configuration example of the camera module of camera section 1.This camera module, possess the related imaging lens system of the present embodiment of accommodating lens barrel 3, support lens barrel 3 supporting substrate 4, on supporting substrate 4, be arranged on imaging apparatus corresponding to the position of the imaging surface of imaging lens system.This camera module also possesses: be connected electrically in the imaging apparatus of supporting substrate 4 flexible base, board 5, be connected electrically in flexible base, board 5 and the external connection terminals 6 of the signal processing circuit that constitutes in the mode of the terminal device base side of the mobile phone etc. that can be connected in the band camera.These inscapes are constituted by one.
In this camera module, the optical image that is formed by imaging lens system is transformed into electric image pickup signal by imaging apparatus, and this image pickup signal is output to the signal processing circuit of terminal device base side by flexible base, board 5 and external connection terminals 6.Therefore, in this camera module,, can obtain high-resolution image pickup signal by using the related imaging lens system of present embodiment.In the terminal device base side, can generate high-resolution image according to this image pickup signal.
The imaging lens system that present embodiment is related as Fig. 1～shown in Figure 13, possesses the 1st lens L1, the 2nd lens L2 and the 3rd lens L3 successively along optical axis Z1 from object side.In order to ensure telecentric iris, optical aperture diaphragm St is configured in object side for desirable as far as possible, and in each configuration example, aperture diaphragm St all is configured in the front side of the 1st lens L1, the most close object side of lens system.Imaging apparatus at the imaging surface Simg of this imaging lens system configuration CCD etc.According to the formation of the phase pusher side that lens are installed, the various opticses of configuration between the 3rd lens L3 and imaging apparatus.For example, configuration shooting face is protected the flat glass plate GC with cloche or cutoff filter etc.
The 1st lens L1, the 2nd lens L2 and the 3rd lens L3 seek miniaturization for the lens number with minority respectively, proofread and correct all aberrations simultaneously, and the two sides is that aspherical shape is desirable.At this moment, because plastic lens helps the processing of non-spherical lens, therefore, it is desirable adopting suitable plastic lens.
The 1st lens L1 has positive refracting power near optical axis.The face of the object side of the 1st lens L1 becomes convex form towards object side near optical axis.The face of the picture side of the 1st lens L1, configuration example the 1st, the 2nd, the 4th, the 5th, the 6th, the 7th and the 8th (Fig. 1, Fig. 2, Fig. 4, Fig. 5, Fig. 6, Fig. 7 and Fig. 8), near optical axis, becoming concave shape, near optical axis, becoming the formation of positive meniscus shaped lens as side.And, the configuration example the 3rd, the 10th, the 11st, the 12nd and the 13rd (Fig. 3, Figure 10, Figure 11, Figure 12 and Figure 13), the face of the picture side of the 1st lens L1 towards becoming flat shape as side, becomes the formation of plano-convex lens near optical axis near optical axis.And in the configuration example the 9th (Fig. 9), the face of the picture side of the 1st lens L1 is becoming convex form as side near optical axis, become the formation of biconvex lens near optical axis.The Abbe number υ dl of the 1st lens L1 is υ dl〉50 for desirable.
And the face of the picture side of the 1st lens L1 is preferably following such aspheric surface: promptly along with advance to periphery with optical axis near compare object side shape change.Be preferably, for example near optical axis, be concave shape or approach the shape on plane, along with advancing to periphery and becoming the such aspherical shape of convex form.
The 2nd lens L2 has the refracting power of plus or minus near optical axis.The face of the object side of the 2nd lens L2 becomes concave shape at object side near optical axis, and is nearby becoming convex form as side as the face of side at optical axis, becomes near optical axis the formation of concave surface towards the meniscus shaped lens of object side.
During as aspherical shape, the shape that is preferably the face that makes object side becomes following such aspherical shape: for example change than near the shape optical axis along with advancing to periphery at object side with the 2nd lens L2.At optical axis is concave shape nearby, the absolute value of periphery radius-of-curvature than optical axis near little (becoming stronger concave surface) such be shaped as ideal.
The 3rd lens L3 has the refracting power of plus or minus near optical axis.The face of the object side of the 3rd lens L3 becomes protruding or concave shape at object side near optical axis.The face of picture side is becoming concave shape as side near optical axis.The face of the picture side of the 3rd lens L3, for example near optical axis towards becoming concave shape as side, near optical axis, become the formation of positive meniscus shaped lens.
The Abbe number υ d3 of the 3rd lens L3 is preferably υ d3〉50.
Therefore, the 3rd lens L3 is the lens that are configured in the most close shooting face side.For this reason, at the 3rd lens L3, to compare light beam separated by each visual angle with the 1st lens L1 and the 2nd lens L2.Thereby, proofread and correct the aberration at each visual angle at the 3rd lens L3 easily by suitable use aspheric surface, and proofread and correct curvature of the image (image planes gulf song) and distortion aberration easily.And, guarantee telecentric iris easily.For this reason, make near the shape optical axis of the 3rd lens L3 and be not all ideal in the shape of periphery.With the face of the object side of the 3rd lens L3, for example, be concave shape near optical axis particularly, towards periphery midway for approaching the plane, perhaps, be convex form near optical axis, be concave shape towards periphery midway.
And the face as side of the 3rd lens L3 is preferably the aspherical shape following: promptly nearby compare with optical axis along with advancing to periphery, shape is to changing as side halfway, and finally to changing at object side.For example, near optical axis concave shape, become the big concave shape of absolute value of radius-of-curvature halfway, become the such aspherical shape of convex form along with advancing for desirable to periphery.
The imaging lens system of present embodiment, at least a in the formula that meets the following conditions for desirable.
f/f3<0.95……(1)
More preferably,
f/f3<0.7……(1)′，
BR2<0.1……(2-0)，
BR2＜0 ... (2) be desirable.
BR2＜-0.2 ... (2-1) even more ideal.
BR2＜-0.32 ... (2-2) even more ideal.
0.22<(D3+D4)/f<0.43……(3)
0.25＜(D3+D4)/f＜0.40 ... (3) ' be desirable.
υ d2〉40 and ,-1.2＜f3/f＜0.0 ... (4)
In addition, in formula (4), f3/f satisfies
-1.0＜f3/f＜0.0 ... (4) ' be desirable.
υ d2〉40 and, 0.0＜f2/f＜2.0 ... (5)
D4/f<0.136……(6)
υ d2〉40 and, (D4+D6)/f＜0.31 ... (7)
D6/f≦0.155……(8)
0.0<f2/f<1.0……(9)
F3/f＜-0.4 and ,-5.6＜f2/f＜-3.3 ... (10)
In addition, in formula (10), f2/f satisfies
-5.6＜f2/f＜-3.7 ... (10) ' be desirable.
F3/f＜-0.4 and, 0.5＜f2/f ... (10A)
F3/f＜-1.66 and, 0.1＜| f1/f2|＜0.5 ... (11)
In addition, in formula (9), f1/f2 satisfies
0.1＜f1/f2＜0.5 ... (11) ' or
-0.5＜f1/f2＜-0.1 ... (11) " be desirable.
—0.85<f2/{f3·(45-υd2)}<—0.13……(12)
f/R6<—0.4……(13)
—1.2<f3/f<0.0……(14)
-2.5＜f/f3＜0.0 and, 0.5＜f2/f ... (15)
In addition, in above conditional,
F: system-wide focal length
F1: the focal length of the 1st lens L1
F2: the focal length of the 2nd lens L2
F3: the focal length of the 3rd lens L3
D3: the face on optical axis of the 1st lens rear surface and the 2nd lens front surface at interval
D4: the center thickness of the 2nd lens L2
D6: the center thickness of the 3rd lens L3
R6: the paraxial radius-of-curvature of the face of the object side of the 3rd lens L3
υ d2: the Abbe number of the 2nd lens L2.
And, in conditional (2-0), (2), (2-1), (2-2), BR2 is made as A with the optical axis vertex position P1 from the 2nd lens front surface to the distance that surpasses till the position P2 that light passed through at image height angle in the 2nd lens rear surface, when the center thickness of the 2nd lens L2 is made as D4, BR2=A/D4.In addition, the travel direction (from the direction of object side towards the picture side) with light just is made as.The notion of representing this BR2 at Figure 14 (A), Figure 14 (B).Because D4 is the center thickness of the 2nd lens L2, so bigger than 0.So, if A〉and 0, BR2 then〉0.Become A〉0 be, shown in Figure 14 (A), the travel direction of light is made as timing, at periphery, the 2nd lens rear surface is positioned at more close picture side than the optical axis vertex position P1 of front surface.And, if A＜0, then BR2＜0.What become A＜0 is, shown in Figure 14 (B), the travel direction of light is made as timing, and at periphery, the 2nd lens rear surface is positioned at more close object side than the optical axis vertex position P1 of front surface.
At this, in the present embodiment, the desirable configuration example of considering each conditional is described.For example, roughly can consider 6 kinds of desirable formations respectively.Represent the relation of these formation groups and conditional at Figure 29, and with the corresponding relation of embodiment described later.
＜the 1 formation group 〉
(basic comprising 1-1)
Set aperture diaphragm St, the 1st lens L1, the 2nd lens L2, the 3rd lens L3 successively from object side, the 1st lens L1 is by the positive lens of convex surface towards object side formed, the 2nd lens L2 is by forming the meniscus lens of concave surface towards object side, and is the formation of satisfy condition formula (1), (2).
With basic comprising 1-1 as basic, for following desirable formation also passable.
(constituting 1-2)
Satisfy basic comprising 1-1, the formation of the formula that further satisfies condition (3).
(constituting 1-3)
Satisfy basic comprising 1-1 or constitute 1-2, the formation of formula (4) that further satisfy condition.
(constituting 1-4)
Satisfy basic comprising 1-1, the formation of the formula that further satisfies condition (5) is also passable.
And in constituting 1-1～1-4, the formation of formula that satisfies condition (2-1) or conditional (2-2) is also passable.
＜the 2 formation group 〉
(basic comprising 2-1)
Set aperture diaphragm St, the 1st lens L1, the 2nd lens L2, the 3rd lens L3 successively from object side, the 1st lens L1 is by the positive lens of convex surface towards object side formed, the 2nd lens L2 is by forming the lens of concave surface towards object side, and becomes the formation of the formula of satisfying condition (1), (6).
With basic comprising 2-1 as basic, for following desirable formation also passable.
(constituting 2-2)
Satisfy basic comprising 2-1, the formation of the formula that further satisfies condition (3).
(constituting 2-3)
Satisfy and constitute 2-2, the formation of formula (7) that further satisfy condition.
(constituting 2-4)
Satisfy and constitute 2-2 or 2-3, the formation of formula (8) that further satisfy condition.
Also can be following preferred formation in addition.
(constituting 2-5)
Satisfy basic comprising 2-1, and the formation of the formula that satisfies condition (10).
(constituting 2-6)
Satisfy basic comprising 2-1, and the formation of the formula that satisfies condition (4).
(constituting 2-7)
Satisfy basic comprising 2-1, and the formation of the formula that satisfies condition (11).
(constituting 2-8)
Satisfy basic comprising 2-1, and the formula that satisfies condition (11) " formation.
And, constituting 2-1～2-4, the formation of formula that satisfies condition (4) and conditional (5) is also passable.Perhaps, constituting 2-1～2-4, the formula that satisfies condition (3) ', conditional (4) ' or the formation of the formula that satisfies condition (9) is also passable.
＜the 3 formation group 〉
(basic comprising 3-1)
Set aperture diaphragm St, the 1st lens L1, the 2nd lens L2, the 3rd lens L3 successively from object side, the 1st lens L1 is by the positive lens of convex surface towards object side formed, the 2nd lens L2 is by forming the lens of concave surface towards the positive refracting power of having of object side, and the formation of the formula that satisfies condition (3), (9).
With basic comprising 3-1 as basic, for following desirable formation also passable.
(constituting 3-2)
Satisfy basic comprising 3-1, the formation of the formula that further satisfies condition (4).
And, constituting 3-1,3-2, the formula that satisfies condition (3) ' or conditional (4) ' formation also passable.
＜the 4 formation group 〉
(basic comprising 4-1)
Set aperture diaphragm St, the 1st lens L1, the 2nd lens L2, the 3rd lens L3 successively from object side, the 1st lens L1 is by the positive lens of convex surface towards object side formed, the 2nd lens L2 is by the lens of concave surface towards the negative refracting power of having of object side are formed, the 3rd lens L3 is formed by the lens with negative refracting power, and becomes the formation of the formula of satisfying condition (3), (10).
＜the 5 formation group 〉
(basic comprising 5-1)
Set aperture diaphragm St, the 1st lens L1, the 2nd lens L2, the 3rd lens L3 successively from object side, the 1st lens L1 is by the positive lens of convex surface towards object side formed, the 2nd lens L2 is by the lens of concave surface towards object side are formed, the 3rd lens L3 is formed by the lens with negative refracting power, and the formation of the formula that satisfies condition (3), (11).
And, with basic comprising 5-1 as basic, the formula that satisfies condition (11) ' or conditional (11) " formation also passable.
＜the 6 formation group 〉
(basic comprising 6-1)
Set aperture diaphragm St, the 1st lens L1, the 2nd lens L2, the 3rd lens L3 successively from object side, the 1st lens L1 is by the positive lens of convex surface towards object side formed, the 2nd lens L2 is by forming the lens of concave surface towards object side, and the formation of the formula that satisfies condition (12).
With basic comprising 6-1 as basic, for following desirable formation also passable.
(constituting 6-2)
Satisfy basic comprising 6-1, the formation of the formula that further satisfies condition (2).
(constituting 6-3)
Satisfy and constitute 6-1, the formation of the formula that further satisfies condition (3), (8).
(constituting 6-4)
Satisfy and constitute 6-1, the formation of formula (6) that further satisfy condition.
And, constituting 6-1～6-4, the formation of formula that satisfies condition (2-1) or conditional (2-2) is also passable.
＜the 7 formation group 〉
(basic comprising 7-1)
From object side set aperture diaphragm St successively, have positive refracting power the 1st lens L1, have positive refracting power the 2nd lens L2, have the 3rd lens L3 of negative refracting power, the 3rd lens L3, the face of object side is concave shape near optical axis, face with the time image side is a convex form at periphery, and for satisfying condition the formation of formula (13).
With basic comprising 7-1 is basic, for following desirable formation also passable.
(constituting 7-2)
Satisfy basic comprising 7-1, the formation of the formula that further satisfies condition (14).
Also can be following preferred formation in addition.
(constituting 7-3)
Satisfy basic comprising 7-1, and the formation of the formula that satisfies condition (3).
(constituting 7-4)
Satisfy basic comprising 7-1, and the formation of the formula that satisfies condition (9).
(constituting 7-5)
Satisfy basic comprising 7-4, and the formation of the formula that satisfies condition (4).
＜the 8 formation group 〉
(basic comprising 8-1)
From object side set aperture diaphragm St successively, have positive refracting power the 1st lens L1, have positive refracting power the 2nd lens L2, have the 3rd lens L3 of negative refracting power, and the formation of the formula that satisfies condition (6), (12), (15).
Below, the effect and the effect of imaging lens system as constituted above are described.
In this imaging lens system, whole constitute with 3 so less lens, distribute etc. about the shape of lens or optical power (power), make the formation global optimization of each lens by making up suitable condition, can seek miniaturization and high performance.
And, in this imaging lens system,, can obtain to help guaranteeing that total length shortens and the lens system of telecentric iris by aperture diaphragm St being configured in the front side of the 1st lens L1.And, in this imaging lens system, by the aspheric surface of each face of optimization, aberration correction more effectively.Imaging apparatus for the high pixel of correspondence requires telecentric iris, and promptly chief ray approaches parallel (incident angle at the shooting face is approaching zero with respect to the normal of shooting face) to the incident angle of imaging apparatus with respect to optical axis.In this imaging lens system, for example, will as the shape of the 3rd lens L3 of the final lens face of close imaging apparatus as the side form near optical axis as side be concave shape and at periphery in the shape as side is convex form, thereby can be, and make and to be controlled to be below certain angle to the incident angle of the light beam of imaging apparatus by the suitable aberration correction in each visual angle.Thus, not only can reduce in the light quantity in the full field of imaging surface inhomogeneous, and, help proofreading and correct curvature of the image and the distortion aberration.
The action effect of each conditional is as follows.
The suitable optical power of conditional (1) regulation the 3rd lens L3.By the formula of satisfying condition (1), the optical power of the 3rd lens L3 is optimized, and mainly contains the correction that is beneficial to curvature of the image and chromatic aberation.
Conditional (2-0), (2), (2-1), (2-2) are relevant with the shape of the 2nd lens, when the value of BR2 near 0 the time, the position P2 of the rear surface periphery of the 2nd lens L2 approaches the optical axis vertex position P1 of front surface.When BR2 is timing, shown in Figure 14 (A), the position P2 of the rear surface periphery of the 2nd lens L2 is than the more close picture side of optical axis vertex position P1 of front surface, when BR2 when negative, shown in Figure 14 (B), the position P2 of the rear surface periphery of the 2nd lens L2 is positioned at more close object side than the optical axis vertex position P1 of front surface.When BR2 near 0, and then negative value is big more, can make the ejaculation angle of light become the obtuse angle, mainly contains to be beneficial to proofread and correct curvature of the image and distortion aberration.
Suitable relation between distance between conditional (3) regulation the 1st lens L1 and the 2nd lens L2 and the center thickness of the 2nd lens L2.By the formula of satisfying condition (3), when suppressing total length, guarantee the ejaculation angle of light easily, also help the correction curvature of the image.If be higher than the upper limit of conditional (3), then total length is elongated, and is unfavorable for proofreading and correct curvature of the image.If be lower than lower limit, then can not suitably keep the ejaculation angle of light.In addition, better is by with numerical range as conditional (3) ' scope, and obtain good optical performance more.
The Abbe number that conditional (4) is defined in the 2nd lens L2 is υ d2〉the suitable optical power of 40 o'clock the 3rd lens L3.In conditional (4),, then mainly be unfavorable for aberration and astigmatic difference on the axis calibration if f3/f surpasses the upper limit.If exceed lower limit, then mainly be unfavorable for proofreading and correct the chromatic aberation of curvature of the image, distortion aberration and multiplying power.In addition, better is by with the numerical range of f3/f as conditional (4) ' scope, and obtain good optical performance more.
The Abbe number that conditional (5) is defined in the 2nd lens L2 is υ d2〉the suitable optical power of 40 o'clock the 2nd lens L2.By the formula of satisfying condition (5), can remain on multiplying power chromatic aberation and curvature of the image and distortion aberration that the 2nd lens L2 takes place well.If f2/f exceeds the upper limit or the lower limit of conditional (5), then mainly be unfavorable for proofreading and correct curvature of the image, distortion aberration.
The suitable center thickness of conditional (6) regulation the 2nd lens L2.By the formula of satisfying condition (6), the center thickness of the 2nd lens L2 becomes smaller, and when suitably keeping the ejaculation angle of light, keeps good resolution performance easily.And, be can be under the little state than being easier to dwindle total length making inhomogeneous sensitivity inhibition.
The Abbe number that conditional (7) is defined in the 2nd lens L2 is υ d2〉40 o'clock the 2nd lens L2 and the 3rd lens L3 suitable center thickness.By the formula of satisfying condition (7), suitably keep the ejaculation angle of resolution performance and light, and will make inhomogeneous sensitivity and suppress for little the time, help the shorteningization of total length.
The suitable center thickness of conditional (8) regulation the 3rd lens L3.By dwindling the center thickness of the 3rd lens L3, and suitably keep the ejaculation angle of resolution performance and light, and will make inhomogeneous sensitivity and suppress for little the time, help the shorteningization of total length in the mode of the formula of satisfying condition (8).By the formula of satisfying condition (8), can be than being easier to shorten total length.And, can take by control material.
The suitable optical power of conditional (9) regulation the 2nd lens L2.By the formula of satisfying condition (9), the optical power of the 2nd lens L2 is optimized, and mainly contains to be beneficial to proofread and correct curvature of the image and distortion aberration.If surpass upper and lower bound, mainly be unfavorable for proofreading and correct curvature of the image and distortion aberration.
The suitable optical power of conditional (10) regulation the 2nd lens L2 and the 3rd lens L3.By the formula of satisfying condition (10), the optical power balance of the 2nd lens L2 and the 3rd lens L3 is optimized, and helps proofreading and correct all aberrations.
Under the state of f3/f＜-0.4, the negative optical power of the 3rd lens L3 dies down, and compares when strong with the optical power of bearing, and the balance of aberration, astigmatic difference, curvature of the image and distortion aberration is abundant inadequately on the axle.Under the condition a little less than the negative optical power of the 3rd lens L3, be in the scope of conditional (10) by the negative optical power that makes the 2nd lens L2, can keep the balance of all aberrations well.In conditional (10),, then can not keep the balance of all aberrations if the scope of the negative optical power of the 2nd lens L2 surpasses the upper limit and lower limit.In addition, better is by numerical range is in conditional (10) ' scope, can obtain more good optical performance.
Conditional (10) is that the desirable condition when the 2nd lens L2 has negative optical power still, when conditional (10) has positive optical power, by the formula of satisfying condition (10A), can obtain the good optical performance.
Conditional (11) is stipulated the suitable optical power of each lens.By the formula of satisfying condition (11), the optical power of the 1st lens L1, the 2nd lens L2 and the 3rd lens L3 is optimized, and helps proofreading and correct all aberrations.
Under the state of f3/f＜-1.66, the negative optical power of the 3rd lens L3 dies down, and compares when strong with the optical power of bearing, and the balance of aberration, astigmatic difference (non-some lattice are poor), curvature of the image and distortion aberration is abundant inadequately on the axle.Under the condition a little less than the negative optical power of the 3rd lens L3, by suitable regulation | the value of f1/f2|, and can keep the balance of all aberrations well.
If surpass 0.1＜| the upper limit of f1/f2|＜0.5, then to compare with the positive optical power of the 1st lens L1, the optical power of the 2nd lens L2 is too strong, and is difficult to simultaneously correcting spherical aberration, curvature of the image, comet aberration and chromatic aberation well.If exceed lower limit, then be difficult to proofread and correct curvature of the image and comet aberration, and can not obtain the good optical performance.In addition, better is by numerical range is in conditional (11) ' or (11) " scope, can obtain good optical performance more.
The suitable balance of the dispersion of the optical power (1/f2) of conditional (12) regulation the 2nd lens L2 and the optical power (1/f3) of the 3rd lens L3 and the 2nd lens L2, thus help reducing the whole chromatic aberation of lens system.If the upper limit and the lower limit of disengaging conditional (12), then axle is gone up the dysequilibrium that reaches the multiplying power chromatic aberation, and can not reach the multiplying power chromatic aberation on the retainer shaft well simultaneously.In order to reduce whole chromatic aberation, the optical power balance of the 2nd lens L2 and the 3rd lens L3 is extremely important, at this moment, be preferably, the optical power of the 2nd lens L2 died down when the 2nd lens L2 was used the little material of Abbe number, on the contrary when the optical power grow of the Abbe number υ of the 2nd lens L2 d2 the 2nd lens L2 greatly the time.By the formula of satisfying condition (12), the value of Abbe number υ d2 is the boundary line with 45, and the optical power of the optical power of the 2nd lens L2 and the 3rd lens L3 is suitably controlled.
The suitable shape of the face of the object side of conditional (13) regulation the 3rd lens L3.Concave shape in the mode of the formula of satisfying condition (13) with the face of the object side of the 3rd lens L3 forms more intensely, thereby when keeping curvature of the image and distortion aberration well, suitably keeps the ejaculation angle of light, and guarantee telecentric iris easily.
The suitable optical power of conditional (14) regulation the 3rd lens L3.In conditional (14),, then mainly be unfavorable for aberration and astigmatic difference on the axis calibration if f3/f exceeds the upper limit.If exceed lower limit, then mainly be unfavorable for the correction of the chromatic aberation of curvature of the image, distortion aberration and multiplying power.
The suitable optical power of conditional (15) regulation the 2nd lens L2 and the 3rd lens L3, by the formula of satisfying condition (15), the balance of the optical power of the 2nd lens L2 and the 3rd lens L3 is optimized, and helps proofreading and correct all aberrations.
As described above, the imaging lens system related according to present embodiment by the minority lens number of integral body with 3, and carried out the optimization of the formation of each lens, thereby, can realize that the small-sized and high performance imaging lens system of proofreading and correct all aberrations corresponding to high pixelation well is.And, by satisfying suitable ideal conditions, can obtain good optical performance more.Perhaps, can obtain the outstanding manufacturing applicability of production.And, camera module or the mobile terminal device related according to present embodiment, output and the corresponding electric signal of optical image that forms by means of the related high performance imaging lens system of present embodiment can obtain high-resolution image pickup signal.Especially related according to present embodiment mobile terminal device can obtain high-resolution photographs according to its image pickup signal.
[embodiment]
Then, describe for the concrete numerical value embodiment of the related imaging lens system of present embodiment, below, summarize the 1st and even the 13rd numerical value embodiment and describe.
As embodiment 1, at the concrete lens data of Figure 15 (A), Figure 15 (B) expression corresponding to the formation of imaging lens system shown in Figure 1.Especially, represent the lens data that it is basic, in the relevant aspheric data of Figure 15 (B) expression at Figure 15 (A).Face number Si hurdle at the lens data shown in Figure 15 (A) represents, will comprise aperture diaphragm St the face of the inscape of close object side as the 1st and along with number towards i (i=1～9) face of the mode diacritic that increases successively as side.Represent on radius of curvature R i one hurdle, corresponding to the value (mm) of the symbol Ri that adds at Fig. 1 from the radius-of-curvature of i face of object side.For face interval D i one hurdle, equally also represent the interval (mm) from the optical axis of i face Si of object side and i+1 face Si+1.Ndj represents the value to the refractive index of d line (wavelength 587.6nm) from the optical parameter of object side j (j=1～4).υ dj represents on one hurdle the value to the Abbe number of d line from j optical parameter of object side.
The imaging lens system that embodiment 1 is related, the two sides of the 1st lens L1, the 2nd lens L2 and the 3rd lens L3 is all aspherical shape.At the basic lens data of Figure 15 (A), represent near the numerical value of the radius-of-curvature the optical axis as these aspheric radius-of-curvature.In the numerical value that Figure 15 (B) represents as aspherical surface data, and then its numerical value is for 10 being " power exponent " at the end for mark " E " expression, and expression is 10 being the numerical value that numerical value that the exponential function at the end is represented multiply by " E " front surface with this.For example, if " 1.0E-02 ", then expression " 1.0 * 10
-2".
Charge to by each coefficient B as aspherical surface data with the formula of the aspherical shape of following formula (A) expression
n, KA value.More specifically, Z represents the length (mm) of the vertical line of and picture vertical to the section (plane vertical with optical axis Z1) on aspheric summit from the point on the aspheric surface of optical axis Z1 height Y position.In each aspheric surface of the imaging lens system that embodiment 1 is related, as asphericity coefficient B
nEffectively utilize the the the 4th, the 6th, the 8th and the 10th time inferior coefficient B of even number
4, B
6, B
8, B
10And represent.
Z＝C·Y
2/{1+(1—KA·C
2·Y
2)
1/2}+∑B
n·Y
n……(A)
(integer that n=3 is above)
Herein,
Z: the aspheric degree of depth (mm)
Y: the distance from optical axis to lens face (highly) (mm)
KA: circular cone fixed number
C: paraxial curvature=1/R
(R: paraxial radius-of-curvature)
B
n: the n time asphericity coefficient
As the related imaging lens system of above embodiment 1,, show concrete lens data corresponding to the formation of the imaging lens system of Fig. 2～shown in Figure 13 at Figure 16 (A), Figure 16 (B)～Figure 27 (A), Figure 27 (B) as embodiment 2～13.Embodiment 2～13 all similarly to Example 1, the two sides of the 1st lens L1, the 2nd lens L2 and the 3rd lens L3 is all aspherical shape.The imaging lens system that embodiment 9 is related, as embodiment 1, each aspheric surface is as asphericity coefficient B
nEffectively utilize the the the 4th, the 6th, the 8th and the 10th time inferior coefficient B of even number
4, B
6, B
8, B
10And represent.Among the embodiment 2～13, in the embodiment except that embodiment 9, each aspheric surface is as asphericity coefficient B
nEffectively utilize the 3rd time～the 10th time even number to reach the inferior coefficient B of odd number
3～B
10And represent.
At Figure 28 each embodiment is summarized the value of expression about above-mentioned each conditional.In addition, EX. represents embodiment.At Figure 28, emphasize that with shade the part of representing represents that the value of embodiment is in the numerical range of conditional.
And Figure 29 represents the relation of above-mentioned formation group and conditional, and with the corresponding relation of the various embodiments described above.
Figure 30 (A)～Figure 30 (C) represents spherical aberration, astigmatism and the distortion aberration (distortion aberration) of the imaging lens system that embodiment 1 is related respectively.Represent with the e line to be the aberration of reference wavelength at each aberration diagram.The aberration of also representing F line (wavelength 486.13nm), C line (wavelength 656.27nm) at spherical aberration diagram and astigmatism figure.In astigmatism figure, solid line represents that sagitta of arc direction (S), dotted line represent the aberration of tangent direction (T).FNo. represent the F value, Y represents image height.
Equally, at all aberration diagrams of the related imaging lens system of Figure 31 (A), Figure 31 (B), Figure 31 (C)～Figure 42 (A), Figure 42 (B), Figure 42 (C) expression embodiment 2～13.
Can learn from each above numeric data and each aberration diagram, to each embodiment, whole with 3 minority lens number and each lens of optimization constitute, can realize having proofreaied and correct well the small-sized and high performance imaging lens system system of curvature of the image or comet aberration etc.
In addition, the present invention is not limited to above-mentioned embodiment and each embodiment, and can carry out various distortion.For example, the value of the radius-of-curvature of each lens composition, face interval and refractive index etc. is not limited to the value shown in above-mentioned each numerical value embodiment, can also get other values.
Claims (25)
1. the imaging lens system of 3 formations is characterized in that, is equipped with aperture diaphragm, the 1st lens, the 2nd lens, the 3rd lens successively from object side,
Above-mentioned the 1st lens are by forming the positive lens of convex surface towards object side,
Above-mentioned the 2nd lens are by forming the meniscus shaped lens of concave surface towards object side,
And, satisfy following conditional:
f/f3<0.95……(1)
BR2<0……(2)
Wherein,
BR2: radiation direction just is made as, will be made as A to being positioned at the distance of the 2nd lens rear surface from the optical axis vertex position P1 of the 2nd lens front surface to the position P2 that light passed through at image height angle, when the center thickness of the 2nd lens is made as D4, BR2=A/D4,
F: system-wide focal length
F3: the focal length of the 3rd lens.
2. the imaging lens system of 3 formations according to claim 1 is characterized in that, further satisfies following conditional:
22<(D3+D4)/f<0.43……(3)
Wherein,
D3: the face interval on optical axis of the 1st lens rear surface and the 2nd lens front surface,
D4: the center thickness of the 2nd lens.
3. the imaging lens system of 3 formations according to claim 1 is characterized in that, further satisfies following conditional:
υ d2〉40, and-1.2＜f3/f＜0.0 ... (4)
Wherein,
The Abbe number of the 2nd lens of υ d2:d line.
4. the imaging lens system of 3 formations according to claim 2 is characterized in that, further satisfies following conditional:
υ d2〉40, and-1.2＜f3/f＜0.0 ... (4)
Wherein,
The Abbe number of the 2nd lens of υ d2:d line.
5. the imaging lens system of 3 formations according to claim 1 is characterized in that, further satisfies following conditional:
υ d2〉40 and, 0.0＜f2/f＜2.0 ... (5)
Wherein,
The Abbe number of the 2nd lens of υ d2:d line
F2: the focal length of the 2nd lens.
6. the imaging lens system of 3 formations is characterized in that, is equipped with aperture diaphragm, the 1st lens, the 2nd lens, the 3rd lens successively from object side,
Above-mentioned the 1st lens are by forming the positive lens of convex surface towards object side,
Above-mentioned the 2nd lens are by forming the lens of concave surface towards object side,
And, satisfy following conditional:
f/f3<0.95……(1)
D4/f<0.136……(6)
Wherein,
D4: the center thickness of the 2nd lens
F: system-wide focal length
F3: the focal length of the 3rd lens.
7. the imaging lens system of 3 formations according to claim 6 is characterized in that, further satisfies following conditional:
F3/f＜-0.4, and-5.6＜f2/f＜-3.3 ... (10)
Wherein,
F2: the focal length of the 2nd lens.
8. the imaging lens system of 3 formations according to claim 6 is characterized in that, further satisfies following conditional:
υ d2〉40, and-1.2＜f3/f＜0.0 ... (4)
Wherein,
The Abbe number of the 2nd lens of υ d2:d line.
9. the imaging lens system of 3 formations according to claim 6 is characterized in that, further satisfies following conditional:
F3/f＜-1.66 and, 0.1＜| f1/f2|＜0.5 ... (11)
Wherein,
F1: the focal length of the 1st lens,
F2: the focal length of the 2nd lens.
10. the imaging lens system of 3 formations according to claim 6 is characterized in that, further satisfies following conditional:
—0.5<f1/f2<—0.1
Wherein,
F1: the focal length of the 1st lens,
F2: the focal length of the 2nd lens.
11. the imaging lens system of 3 formations according to claim 6 is characterized in that, further satisfies following conditional:
22<(D3+D4)/f<0.43……(3)
Wherein,
D3: the face on optical axis of the 1st lens rear surface and the 2nd lens front surface at interval.
12. the imaging lens system of 3 formations according to claim 11 is characterized in that, further satisfies following conditional:
υ d2〉40, and (D4+D6)/f＜0.31 ... (7)
Wherein,
The Abbe number of the 2nd lens of υ d2:d line,
D6: the center thickness of the 3rd lens.
13. the imaging lens system of 3 formations according to claim 11 is characterized in that, further satisfies following conditional:
D6/f≦0.155……(8)
Wherein,
D6: the center thickness of the 3rd lens.
14. the imaging lens system of 3 formations according to claim 12 is characterized in that, further satisfies following conditional:
D6/f≦0.155……(8)
Wherein,
D6: the center thickness of the 3rd lens.
15. the imaging lens system of 3 formations is characterized in that, is equipped with aperture diaphragm, the 1st lens, the 2nd lens, the 3rd lens successively from object side,
Above-mentioned the 1st lens are by forming the positive lens of convex surface towards object side,
Above-mentioned the 2nd lens are by forming the lens of concave surface towards the negative refracting power of having of object side,
Above-mentioned the 3rd lens are formed by the lens with negative refracting power,
And, satisfy following conditional:
22<(D3+D4)/f<0.43……(3)
F3/f＜-0.4 and ,-5.6＜f2/f＜-3.3 ... (10)
Wherein,
F: system-wide focal length,
F2: the focal length of the 2nd lens,
F3: the focal length of the 3rd lens,
D3: the face interval on optical axis of the 1st lens rear surface and the 2nd lens front surface,
D4: the center thickness of the 2nd lens.
16. the imaging lens system of 3 formations is characterized in that, is equipped with aperture diaphragm, the 1st lens, the 2nd lens, the 3rd lens successively from object side,
Above-mentioned the 1st lens by with convex surface towards the positive lens of object side and constitute,
Above-mentioned the 2nd lens by with concave surface towards the lens of object side and constitute,
Above-mentioned the 3rd lens are formed by the lens with negative refracting power,
And satisfy following conditional:
22<(D3+D4)/f<0.43……(3)
F3/f＜-1.66 and, 0.1＜| f1/f2|＜0.5 ... (11)
Wherein,
F: system-wide focal length,
F1: the focal length of the 1st lens,
F2: the focal length of the 2nd lens,
F3: the focal length of the 3rd lens,
D3: the face interval on optical axis of the 1st lens rear surface and the 2nd lens front surface,
D4: the center thickness of the 2nd lens.
17. the imaging lens system of 3 formations is characterized in that,
From object side be equipped with aperture diaphragm successively, have positive refracting power the 1st lens, have positive refracting power the 2nd lens, have the 3rd lens of negative refracting power,
Above-mentioned the 3rd lens, the face of object side are concave shape near optical axis, and are convex form as the face of side at periphery,
And satisfy following conditional:
22<(D3+D4)/f<0.43……(3)
f/R6<—0.4……(13)
Wherein,
R6: the paraxial radius-of-curvature of the face of the object side of the 3rd lens,
F: system-wide focal length,
D3: the face interval on optical axis of the 1st lens rear surface and the 2nd lens front surface,
D4: the center thickness of the 2nd lens.
18. the imaging lens system of 3 formations according to claim 17 is characterized in that,
Satisfy following conditional:
0<f2/f<1……(9)
Wherein,
F: system-wide focal length,
F2: the focal length of the 2nd lens.
19. the imaging lens system of 3 formations according to claim 18 is characterized in that, further satisfies following conditional:
υ d2〉40 and ,-1.2＜f3/f＜0.0 ... (4)
Wherein,
The Abbe number of the 2nd lens of υ d2:d line,
F3: the focal length of the 3rd lens.
20. the imaging lens system of 3 formations according to claim 17 is characterized in that, further satisfies following conditional:
—1.2<f3/f<0.0……(14)
Wherein,
F3: the focal length of the 3rd lens.
Applications Claiming Priority (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2006-303104 | 2006-11-08 | ||
| JP2006303104 | 2006-11-08 | ||
| JP2006303104 | 2006-11-08 | ||
| JP2007285913A JP2008139853A (en) | 2006-11-08 | 2007-11-02 | Imaging lens having three-lens configuration, camera module, and portable terminal equipment |
| JP2007285913 | 2007-11-02 | ||
| JP2007-285913 | 2007-11-02 |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN2010101433219A Division CN101782678B (en) | 2006-11-08 | 2007-11-08 | Imaging lens having three-lens configuration |
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| CN101430416B CN101430416B (en) | 2011-09-28 |
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| CN2010101433219A Expired - Fee Related CN101782678B (en) | 2006-11-08 | 2007-11-08 | Imaging lens having three-lens configuration |
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| CN2010101433219A Expired - Fee Related CN101782678B (en) | 2006-11-08 | 2007-11-08 | Imaging lens having three-lens configuration |
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| CN (2) | CN101430416B (en) |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN101782678A (en) | 2010-07-21 |
| CN101782678B (en) | 2011-12-28 |
| CN101430416B (en) | 2011-09-28 |
| JP2008139853A (en) | 2008-06-19 |
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Effective date of registration: 20190117 Address after: East of Liuxue Road and North of Longtan Canal in Nanchang Economic and Technological Development Zone, Jiangxi Province Patentee after: NANCHANG OFILM OPTICAL-ELECTRONIC TECH Co.,Ltd. Address before: Tokyo, Japan Patentee before: FUJIFILM Corp. |
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Effective date of registration: 20200424 Address after: 300385 No.2, Hongyuan Road, Xiqing Economic Development Zone, Xiqing District, Tianjin Patentee after: Tianjin Oufei photoelectric Co.,Ltd. Address before: 330013 east of lilac road in Nanchang economic and Technological Development Zone, Jiangxi Province, north of Longtan water canal Patentee before: NANCHANG OFILM OPTICAL-ELECTRONIC TECH Co.,Ltd. |
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Granted publication date: 20110928 |