CN1763578A - Imaging lens system - Google Patents
Imaging lens system Download PDFInfo
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- CN1763578A CN1763578A CN 200510109432 CN200510109432A CN1763578A CN 1763578 A CN1763578 A CN 1763578A CN 200510109432 CN200510109432 CN 200510109432 CN 200510109432 A CN200510109432 A CN 200510109432A CN 1763578 A CN1763578 A CN 1763578A
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Abstract
The present invention provides a compact imaging lens. The compact imaging lens comprises, from the object side to the image side, a diaphragm (2), a first positive meniscus lens (3) with a positive focal crescent shape which the convex surface of which facing the object side, and a second positive lens (4) the convex surface of which facing the image surface side, wherein following inequalities are satisfied 1.25>=L/fl>=0.8, 0.55>=f1/f2>=0.2, 1.8>=f1/fl>=1, 4>=f2/fl>=1.5, 1>=d2/d1>=0.5, 0.27>=d1/fl>=0.1, 0.27 >=d3/fl>=0.1 where, L: entire length of the lens system, Fl: focal distance of entire lens system, f1: focal distance of the first lens, f2: focal distance of the second lens, d1: center thickness of the first lens, d2: distance between the first lens and second lens on the optical axis, d3: center thickness of the second lens.
Description
Technical field
The present invention relates to pick-up lens, be particularly related to the camera head that is used on the shooting face of the solid-state imager of the CCD that is configured in notebook computer, videophone, mobile phone etc., CMOS etc., forming subject image such as landscape and personage, and can realize miniaturization and, improved the pick-up lens that constitutes by two lens of optical property and manufacturing property.
Background technology
In recent years, for example be used for being configured in to having used that the demand of the video camera of the solid-state imager of CCD, the CMOS etc. of mobile phone, notebook computer and videophone etc. significantly increases.Such video camera is owing to being disposed at limited being provided with in the space, so require its miniaturization and.
Therefore, the pick-up lens that is used for such video camera requires miniaturization and equally, as such pick-up lens, all uses the simple lens system that is made of lens all the time.
Use such simple lens system, under the situation of the solid-state imager of the resolution that is applied to be called as the about 110,000 pixel degree of having of CIF, though can fully meet the demands, but, in recent years, use to the high-resolution solid-state imager that is called as the about 300,000 pixel degree of having of VGA is studied, and for giving full play to the resolution capability of so high-resolution solid-state imager, uses existing simple lens system to have the problem that can not meet the demands.
Therefore, all the time, the two-lens system that constitutes by two lens of superb optical performance or the various schemes such as three-lens system that constitute by three lens have been proposed to compare with simple lens system.
At this moment, in three-lens system, owing to can revise effectively and each relevant aberration of optical property decline, though can obtain high optical property, but the existing problem of three-lens system is: because amount of parts is many, so be difficult to realize miniaturization and, and, manufacturing cost increased because each is constituted parts permissible accuracy height.
Corresponding therewith, though two-lens system can not expect to have the such optical property of three-lens system, can obtain the optical property higher, for wanting the little and high-resolution solid-state imager of cube to can be described as suitable lens combination than simple lens system.
And, as such two-lens system, all the time, the scheme of the lens combination of proposed many combinations that are called as anti-burnt type (retro-focus type) negative lens and positive lens.Yet, though so anti-burnt type lens combination can reduce cost by reducing amount of parts because back focal length increases, so will realize coming down to impossible from its structure with the miniaturization and of simple lens system same degree.
In addition, as other two-lens system, the lens combination of the combination that is called as long distance type (telephoto type) has been arranged negative lens and positive lens.But, such long distance type lens combination was for being used to take the camera lens that the silver salt photo is developed originally, (back focus distance) is too short for its back focal length, but also having the problem of the heart far away (telecentric) property, the pick-up lens of using as solid-state imager is difficult to former state directly to be used.
Have again, now, in two-lens system or three-lens system, the structure that has disposed aperture between two adjacent on optical axis direction lens has become main flow (for example, with reference to patent documentation 1 one TOHKEMY 2004-163850 communiques and patent documentation 2-TOHKEMY 2004-170460 communique).
But, in recent years, for this pick-up lens, except that requiring miniaturization and, the requirement that further improves optical property increases day by day, as the pick-up lens of being put down in writing in patent documentation 1 and 2, the structure of aperture is disposed in employing between two lens, the problem of existence is that it is difficult will taking into account miniaturization and and further improve optical property, and it also is difficult matching with the characteristic (to the incident angle of sensor) of sensor.
Summary of the invention
Therefore, the present invention proposes in view of there being such problem, and its objective is provides a kind of pick-up lens, the requirement that it can fully satisfy miniaturization and and further improve optical property, and can improve manufacturing property.
Have again, in this manual, manufacturing when so-called manufacturing property is meant except a large amount of production pick-up lens (for example, formability when producing pick-up lens in a large number and cost etc. by injection moulding) outside, also be included as the easiness (for example, the easiness of the processing of the employed metal die of injection moulding etc.) of the processing of making the employed equipment of pick-up lens, making etc.
For achieving the above object, the pick-up lens of first scheme of the present invention, be used on the shooting face of solid-state imager, forming subject image, it is characterized in that: be equipped with aperture successively from object side to the image planes side, make and have convex surface towards first lens of the meniscus lens of the positive focal power of object side and make and have second lens of convex surface, and satisfy each conditional of following (1)-(7) towards the lens of the positive focal power of image planes side:
1.25≥L/fl≥0.8 (1)
1≥f
1/f
2≥0.55 (2)
1.8≥f
1/fl≥1 (3)
4≥f
2/fl≥1.5 (4)
1≥d
2/d
1≥0.5 (5)
0.27≥d
1/fl≥0.1 (6)
0.27≥d
3/fl≥0.1 (7)
Wherein,
L: the total length of lens combination
Fl: the focal length of whole lens combination
f
1: the focal length of first lens
f
2: the focal length of second lens
d
1: the center thickness of first lens
d
2: first lens on the optical axis and the interval of second lens
d
3: the center thickness of second lens
And, according to the invention of this first scheme, by aperture is disposed at the most close object side, can guarantee high disposition far away, and can relax the incident angle of light the sensor of solid-state imager.
In addition, in the present invention, aperture is disposed at the most close object side does not hinder near the part optical axis of face (convex surface) of the object side of first lens to be positioned at position than the more close object side of aperture by aperture.Even in this case, as the configuration of physics owing to can be described as aperture is configured in than the more close object side of the first lens integral body, so do not violate the record of first scheme.
And, invention according to first scheme, first lens are made have the meniscus lens of convex surface towards the positive focal power of object side, and second lens are made lens with positive focal power, and then, make the focal power of each lens satisfy each conditional of (1)-(7) by regulation, thereby can realize miniaturization and, and can improve manufacturing.
The pick-up lens of alternative plan of the present invention is on the basis of first scheme, it is characterized in that, above-mentioned second lens are made meniscus lens.
According to the invention of this alternative plan, can not increase burden to the shape of first lens and second lens just can further improve the optical property of peripheral part, and, can more effectively utilize the light of the peripheral part that incides solid-state imager.
The pick-up lens of third party's case of the present invention is on the basis of first scheme, it is characterized in that, near the face of the object side of above-mentioned second lens part optical axis is made to object side and protruded, and makes the aspheric surface with flex point.
According to the invention of this third party's case, can further alleviate the burden of each lens shape and further improve the optical property of peripheral part, and, can more effectively utilize the light of the peripheral part that incides solid-state imager.
The pick-up lens of the cubic case of the present invention is on the basis of third party's case, it is characterized in that, the position, outer end of the effective diameter of the face of the object side of above-mentioned second lens is positioned at the position than the more close object side of point on the optical axis of the face of the object side of these second lens.
According to the invention of this cubic case, also can further improve the optical property of peripheral part.And, not only help operational processes to lens, also help the assembling procedure when entirety of lens package made assembly in lens barrel.
The pick-up lens of the present invention's the 5th scheme is on the basis of arbitrary scheme in first to fourth scheme, it is characterized in that, said aperture also satisfies the following conditions formula:
0.2≥S (8)
Wherein, S: said aperture on the optical axis and the distance between the optical surface of close object side
According to the invention of the 5th scheme,, can more effectively guarantee disposition far away, and can further realize miniaturization and by satisfying the conditional of (8).
The pick-up lens of the present invention's the 6th scheme is on the basis of first to the 5th scheme, it is characterized in that, also satisfies the following conditions formula:
0.8≥Bfl/fl≥0.4 (9)
Wherein, Bfl: back focal length (distance (air characteristic chamber length) on the optical axis from the final face of lens to the shooting face)
According to the invention of the 6th scheme, by satisfying the conditional of (9), can more effectively realize miniaturization and, and the easy operating when can further improve manufacturing and assembling.
The pick-up lens of the present invention's the 7th scheme is on the basis of arbitrary scheme in first to the 6th scheme, it is characterized in that, also satisfies the following conditions formula:
2.5≥Bfl≥1.2 (10)
According to the invention of the 7th scheme, by satisfying the conditional of (10), can more effectively realize miniaturization and, and the easy operating when can further improve manufacturing and assembling.
The pick-up lens of the present invention all directions case is on the basis of arbitrary scheme in first to the 7th scheme, it is characterized in that, also satisfies the following conditions formula:
-0.5≥r
4/fl≥-6.0 (11)
Wherein, r
4: the radius-of-curvature of the face of the image planes side of second lens.
According to this invention of case from all directions,, can more easily carry out the processing of optical surface, and can revise the various aberrations of peripheral part better by satisfying the conditional of (11).
The present invention has following effect:
According to the pick-up lens of first scheme of the present invention, can realize miniaturization and, superb optical performance, and the good pick-up lens of manufacturing property.
Pick-up lens according to alternative plan of the present invention, except that the effect of pick-up lens with first scheme, also can when keeping manufacturing preferably, further improve optical property, and, can realize effectively utilizing the little pick-up lens of volume of the light of the peripheral part that incides solid-state imager.
Pick-up lens according to third party's case of the present invention, except that the effect of pick-up lens with first scheme, also can when keeping manufacturing preferably, further bring into play superior optical property, and, can realize more effectively utilizing the little pick-up lens of volume of the light of the peripheral part that incides solid-state imager.
Pick-up lens according to cubic case of the present invention, except that the effect of pick-up lens with third party's case, also can when keeping good manufacturing, further optimize optical property, and, can realize more effectively utilizing the little pick-up lens of volume of the light of the peripheral part that incides solid-state imager.
According to the pick-up lens of the 5th scheme of the present invention, in having the cubic case of first scheme to the, the effect of any one pick-up lens, also can more effectively guarantee disposition far away, and, can realize being suitable for the pick-up lens of miniaturization and more.
According to the pick-up lens of the 6th scheme of the present invention, in having first scheme to the, five schemes, the effect of any one pick-up lens, also can realize miniaturization and and the superior pick-up lens of manufacturing property more.
According to the pick-up lens of the 7th scheme of the present invention, in having first scheme to the, six schemes the effect of any one pick-up lens, also can realize being suitable for miniaturization and further and improve the pick-up lens of manufacturing.
According to the pick-up lens of all directions of the present invention case, in having first scheme to the, seven schemes, the effect of any one pick-up lens, also can realize the pick-up lens that optical property and manufacturing property are more superior.
Description of drawings
Fig. 1 is the summary structural drawing of a kind of embodiment of expression pick-up lens of the present invention.
Fig. 2 is the summary structural drawing of first embodiment of expression pick-up lens of the present invention.
Fig. 3 is the key diagram of spherical aberration, astigmatism and the distortion of expression pick-up lens shown in Figure 2.
Fig. 4 is the summary structural drawing of second embodiment of expression pick-up lens of the present invention.
Fig. 5 is the key diagram of spherical aberration, astigmatism and the distortion of expression pick-up lens shown in Figure 4.
Fig. 6 is the summary structural drawing of the 3rd embodiment of expression pick-up lens of the present invention.
Fig. 7 is the key diagram of spherical aberration, astigmatism and the distortion of expression pick-up lens shown in Figure 6.
Fig. 8 is the summary structural drawing of the 4th embodiment of expression pick-up lens of the present invention.
Fig. 9 is the key diagram of spherical aberration, astigmatism and the distortion of expression pick-up lens shown in Figure 8.
Figure 10 is the summary structural drawing of the 5th embodiment of expression pick-up lens of the present invention.
Figure 11 is the key diagram of spherical aberration, astigmatism and the distortion of expression pick-up lens shown in Figure 10.
Among the figure:
1 pick-up lens, 2 apertures, 3 first lens
4 second lens, 6 light filters, 7 shooting faces
Embodiment
Below, the embodiment of pick-up lens of the present invention is described with reference to Fig. 1.
As shown in Figure 1, the pick-up lens 1 of present embodiment has aperture 2 by the order from object side to the image planes side, makes resinous first lens 3 and affected resinous second lens 4 with convex surface towards the lens of the positive focal power of image planes side with convex surface towards the meniscus lens of the positive focal power of object side.
Below, the object side of first lens 3 and second lens 4 and each lens face of image planes side are called first, second.
And, be equipped with various light filters 6 such as cover glass, IR cut-off filter, optical low-pass filter respectively and as the shooting face 7 of the sensitive surface of imaging apparatuss such as CCD or CMOS in second side of second lens 4.In addition, various light filters 6 also can omit as required.
Here, the position of aperture 2 is the closer to the image planes side, and then the emergent pupil position is just the closer to the image planes side.Therefore, guarantee the disposition far away difficulty that becomes, and from the off-axis ray of pick-up lens 1 outgoing then to the sensor perturbations incident of solid-state imager.
To this, in the present embodiment,, can make the outgoing pupil location be position away from the sensor cover (shooting face) of solid-state imager by aperture 2 is configured in the most close object side.
Therefore, in the present embodiment, farsighted disposition can be guaranteed, and the incident angle of light can be relaxed the sensor of solid-state imager.
And, in the present embodiment, by aperture 2 being disposed at the object side of first lens 3, and first lens 3 are made the curved month type shape of convex surface towards object side, then can effectively utilize first lens 3 second.
That is, on direction, be angle jumpy at second normal, can increase second extent of refraction (correction effect) of first lens 3 away from optical axis 8 with respect to first lens 3 by making off-axis ray.
Therefore, the various aberrations (particularly, coma and aberration) that can effectively revise outside axle to be produced.
In contrast, if second of first lens 3 be shaped as convex surface towards the image planes side, perhaps aperture 2 is disposed under the situation than first lens, 3 more close image planes sides, then can not increase second refractive index of first lens 3, and it is very limited to revise the effect of the outer various aberrations that produced of above-mentioned axle.
And from the viewpoint that the correction effect that makes so various aberrations that produced outside axle increases, second that makes first lens 3 is that aspheric surface is more effective.Have again, in this case, comparatively ideal be make second of first lens 3 for its curvature along with the aspheric surface that increases away from optical axis 8.So, then can make the outer light of axle on direction, be angle more jumpy, and can more effectively increase the correction effect of the various aberrations that outside above-mentioned axle, produced away from optical axis 8 with respect to second normal of first lens 3.
Have again, in the present embodiment, by second shape of second lens 4 is made convex surface towards the image planes side, then can guarantee higher disposition far away, and can more effectively control the incident angle of light the sensor of solid-state imager.And then what second shape of second lens 4 was better is to make its curvature along with the aspheric surface that increases away from optical axis 8.So, then high disposition far away can be further guaranteed, and the incident angle of light can be more effectively controlled the sensor of solid-state imager.
In addition, in the present embodiment, each conditional shown in (1)-(7) below pick-up lens 1 satisfies.
1.25≥L/fl≥0.8 (1)
1.0≥f
1/f
2≥0.55 (2)
1.8≥f
1/fl≥1.0 (3)
4.0≥f
2/fl≥1.5 (4)
1.0≥d
2/d
1≥0.5 (5)
0.27≥d
1/fl≥0.1 (6)
0.27≥d
3/fl≥0.1 (7)
Wherein, the L of (1) formula is the total length of lens combination, promptly is the optic distance from the face of the most close object side to the shooting face physically.In more detail, under near part first the optical axis 8 of first lens 3 was positioned at situation than the position of aperture 2 more close image planes sides, the distance from aperture 2 to the shooting face was L.On the other hand, as mentioned above, near part first the optical axis 8 of first lens 3 is positioned at situation than the position of aperture 2 more close object sides by aperture 2 under, then not to be L from aperture 2 but from first distance of first lens 3 to the shooting face.In addition, the fl in (1), (3), (4), (6) and (7) formula is the focal length of whole lens combination.F in (2) and (3) formula is arranged again
1It is the focal length of first lens 3.Also has the f in (2) and (4) formula
2It is the focal length of second lens 4.In addition, the d in (5) and (6) formula
1It is the center thickness of first lens 3.D in (5) formula is arranged again
2Be first lens 3 on the optical axis 8 and the interval between second lens 4.Also has the d in (7) formula
3It is the center thickness of second lens 4.
Here, if the value of L/fl greater than the value (1.25) shown in (1) formula, then the volume of whole optical system is too big, and the requirement of having violated miniaturization and.On the other hand, if the value of L less than the value (0.8) shown in (1) formula, because the volume of whole optical system is too little, has then reduced manufacturing and has been difficult to keep its optical property.
Therefore,, satisfy the conditional of (1), both can guarantee necessary back focal length, can make whole optical system miniaturization and fully again, and can keep the good optical performance, can also improve manufacturing by the value that makes L/fl according to present embodiment.
In addition, the relation of this L and fl 1.2 〉=L/fl 〉=1.1 more preferably.
In addition, if f
1/ f
2Value greater than the value (1.0) shown in (2) formula, then cross manufacturing reduced owing to the focal power of second lens 4, moreover, also make back focal length long and be difficult to realize miniaturization and.On the other hand, if f
1/ f
2Value less than the value (0.55) shown in (2) formula, then the manufacturing of first lens 3 reduces, and then, also be difficult to guarantee necessary back focal length.
Therefore, according to present embodiment, by further making f
1/ f
2Value satisfy the conditional of (2), can further improve manufacturing, and, can when more effectively guaranteeing necessary back focal length, further make the whole optical system miniaturization and.
In addition, this f
1And f
2Relation 1.0 〉=f more preferably
1/ f
2〉=0.6.
Have again, if f
1The value of/fl is greater than the value (1.8) shown in (3) formula, and then back focal length is long and be difficult to realize miniaturization and.On the other hand, if f
1The value of/fl is less than the value (1.0) shown in (3) formula, and then the manufacturing of first lens descends.
Therefore, according to present embodiment, by further making f
1The value of/fl satisfies the conditional of (3), can further realize miniaturization and and improve manufacturing.
In addition, this f
1With the relation of fl 1.7 〉=f more preferably
1/ fl 〉=1.3.
Also have, if f
2The value of/fl is greater than the value (4.0) shown in (4) formula, and then the manufacturing of first lens 3 descends, and then, also be difficult to guarantee necessary back focal length.On the other hand, if f
2The value of/fl then then makes manufacturing reduce by force because the focal power of second lens is crossed less than the value (1.5) shown in (4) formula.
Therefore, according to present embodiment, by further making f
2The value of/fl satisfies the conditional of (4), when then can further suitably guarantee necessary back focal length, further improves manufacturing.
This f is arranged again
2With the relation of fl 2.4 〉=f more preferably
2/ fl 〉=1.5.
In addition, if d
2/ d
1Value greater than the value (1.0) shown in (5) formula, then must increase the focal power of first lens 3 and second lens 4, then the manufacturing of each lens 3,4 difficulty that becomes.In addition, because the light height of the face of the image planes side by second lens 4 increases,, then make difficulty more so increased aspheric focal power.On the other hand, if d
2/ d
1Value greater than the value (0.5) shown in (5) formula because the center thickness of first lens 3 thickens relatively, then be difficult to guarantee back focal length, more be difficult to insert the aperture that can effectively limit luminous flux.
Therefore, according to present embodiment, by further making d
2/ d
1Value satisfy the conditional of (5), then can further improve manufacturing, and, can further suitably guarantee necessary back focal length, also can keep optical property more well.
In addition, this d
2And d
1Relation 0.9 〉=d more preferably
2/ d
1〉=0.5.
Have again, if d
1The value of/fl is greater than the value (0.27) shown in (6) formula, and then the optical system total length is long, then is difficult to realize miniaturization and.On the other hand, if d
1The value of/fl is less than the value (0.1) shown in (6) formula, and then the manufacturing of first lens 3 becomes difficult.
Therefore, according to present embodiment, by further making d
1The value of/fl satisfies the conditional of (6), then can further realize miniaturization and and improve manufacturing.
In addition, this d
1With the relation of fl 0.25 〉=d more preferably
1/ fl 〉=0.15.
Have again, if d
3The value of/fl is greater than the value (0.27) shown in (7) formula, and then the optical system total length is long, then is difficult to realize miniaturization and.On the other hand, if d
3The value of/fl is less than the value (0.1) shown in (7) formula, and then the manufacturing of second lens 4 becomes difficult.
Therefore, according to present embodiment, by further making d
3The value of/fl satisfies the conditional of (7), then can further make whole optical system miniaturization and more, and can further improve manufacturing.
In addition, this d
3With the relation of fl 0.25 〉=d more preferably
3/ fl 〉=0.15.
Except that said structure, better is that second lens 4 are made meniscus lens.
So, can increase burden to the shape of first lens 3 and second lens 4 and just can improve the optical property of peripheral part, and can more effectively utilize the light that incides the solid-state imager peripheral part.
And better is, first of second lens 4 is that part and forms the aspheric surface with flex point towards the convex surface of object side near the optical axis 8.
Here, first flex point that is had of second lens 4 be meant, makes the point of the sign modification of its inclination on the cross section of PMPQ second lens 4 that comprise optical axis 8 with the tangent tangent line of first the curve (curve on the cross section) of second lens 4.
Therefore, as mentioned above, at the position of first central side of second lens 4 is under the situation of the convex surface of object side, and the position of the perimeter sides that the position of this central side of first is surrounded is the border with the flex point, and its face change of shape is the concave surface towards object side.
So, need not increase burden again to the shape of each lens 3,4 and just can further improve the optical property of peripheral part, and can more effectively utilize the light of each peripheral part of scioptics 3,4.
In addition, also can form first face shape of second lens 4, thereby make along with occurring a plurality of flex points successively from optical axis 8 trend perimeter sides.Under these circumstances, can revise various aberrations better.
Moreover except that said structure, better is that the position, outer end of first effective diameter of second lens 4 is in the position than the more close object side of point on first the optical axis 8 of these second lens.
So, then can further improve the optical property of peripheral part.And, not only help operational processes, and help the assembling procedure when entirety of lens package is formed assembly in lens barrel lens.
And except that said structure, better is the conditional shown in (8) below aperture 2 satisfies.
Wherein, the S of (8) formula is aperture 2 and the distance between the optical surface of close object side on the optical axis 8, promptly is the distance between the aperture 2 on the optical axis 8 and first lens 3 first.In addition, S is a distance physically, and the point on first the optical axis 8 of aperture 2 and first lens 3 is compared can be near the either party in object side and the image planes side.
0.2≥S (8)
So, disposition far away can be more effectively guaranteed, and miniaturization and can be further realized.
In addition, this S value is more preferably got 0.15 〉=S.
Have, except that said structure, better is to satisfy the conditional shown in following (9) again.
Wherein, the Bfl of (9) formula is a back focal length, the distance (air characteristic chamber length) on promptly from the final face of lens (second faces of second lens 4) to the optical axis 8 of shooting face 7.
0.8≥Bfl/fl≥0.4 (9)
So, can more effectively realize miniaturization and, and, can further improve the processing ease degree in manufacturing and the assembling.
In addition, the relation of this Bfl and fl is more preferably got 0.7 〉=Bfl/fl 〉=0.5.
Have, except that said structure, better is to satisfy the conditional shown in following (10) again.
2.5≥Bfl≥1.2 (10)
So, can more effectively realize miniaturization and, and, can further improve the processing ease degree in manufacturing and the assembling.
In addition, this Bfl more preferably gets 2.0 〉=Bfl 〉=1.3.
Have, except that said structure, better is to satisfy the conditional shown in following (11) again.
Wherein, in (11) formula, r
4It is second radius-of-curvature of second lens 4.
-0.5≥r
4/fl≥-6.0 (11)
So, can more easily carry out the processing of optical surface, and, the various aberrations of peripheral part can be revised better.
In addition, this r
4More preferably get-0.7 〉=r with the relation of fl
4/ fl 〉=-1.2.
Have, except that said structure, better is makes fl formula 5.0 〉=fl 〉=2.0 (more preferably 3.5 〉=fl 〉=2.0) that satisfy condition again.
So, can form the structure that is more suitable for the camera lens that camara module that carried terminal etc. disposed uses.
Have again, though be used to form the resin material of first lens 3 and second lens 4 so long as third rare, polycarbonate, noncrystalline polyolefin resin etc. have the material that can be used for the transparency that optical element is shaped, having which type of composition all can, but make efficient and further reduce the viewpoint of manufacturing cost from further raising, comparatively ideal to be that resin material with two lens 3,4 is unified be identical resin material.
Embodiment
Below, with reference to Fig. 2-Figure 11 embodiments of the invention are described.
Here, in the present embodiment, Fno represents the F part, and r represents the radius-of-curvature (occasion of lens is the radius-of-curvature at center) of optical surface.And d represents the distance of next optical surface.And nd is illustrated in the refractive index of each optical system under the situation of irradiation d line (yellow), and vd is illustrated in the Abbe number of each optical system under the situation of same d line.
K, A, B, C, D represent each coefficient in following (12) formula.That is, when establish optical axis 8 directions be the Z axle, with the direction of optical axis 8 quadratures be X-axis, light the direction of propagation for just, k be circular cone coefficient, A, B, C, D be asphericity coefficient, when r is radius-of-curvature, the aspherical shape of lens is represented with following formula.
Z(X)＝r
-1X
2/[1+{1-(k+1)r
-2X
2}
1/2]+AX
4+BX
6+CX
8+DX
10(12)
First embodiment
Fig. 2 represents the first embodiment of the present invention, in the present embodiment, same with the pick-up lens 1 of structure shown in Figure 1, dispose aperture 2 at first object side of first lens 3, between second of second lens 4 and shooting face 7, dispose cover glass as light filter 6.In addition, first of first lens 3 is positioned at position than aperture 2 more close object sides by aperture 2.
Set the pick-up lens 1 of this first embodiment for following condition.
Lens data
L＝2.92mm、fl＝4.09mm、f
1＝4.09mm、f
2＝4.37mm、d
1＝0.50mm、d
2＝0.30mm、d
3＝0.55mm、r4＝-2.564mm、Fno＝2.8
| The sequence number of face | r | d | nd | vd |
| (object point) | ||||
| 1, (first lens, first face) 2, (first lens, second face) 3, (second lens, first face) 4, (second lens, second face) 5, (cover glass first face) 6, (cover glass second face) | 0.769 0.930 20.000 -2.564 0.000 0.000 | 0.500 0.300 0.550 0.000 0.300 | 1.525 1.525 1.516 | 56.0 56.0 64.0 |
| (image planes) | ||||
| The sequence number of face | k | A | | C | D | |
| 1 2 3 4 | -3.77E-2 -1.00E 1.17E+2 8.29E | 4.70E-2 4.16E-1 -2.06E-1 7.15E-2 | -2.40E-1 3.65E-1 -4.88E-2 -3.80E-1 | 1.60E 4.30E -2.00E 5.74E-1 | -2.20 |
Under such condition, then L/fl=1.13 has satisfied (1) formula.And f
1/ f
2=0.94, satisfied (2) formula.F is arranged again
1/ fl=1.59 has satisfied (3) formula.And then, f
2/ fl=1.69 has satisfied (4) formula.And d
2/ d
1=0.6, satisfied (5) formula.And, d
1/ fl=O.19 has satisfied (6) formula.Also has d
3/ fl=0.21 has satisfied (7) formula.And S=0.1mm has satisfied (8) formula.Have, Bfl/fl=0.61 has satisfied (9) formula again.Also have, Bfl=1.57mm has satisfied (10) formula.In addition, r
4/ fl=-0.63 has satisfied (11) formula.
Fig. 3 represents spherical aberration, astigmatism and the distortion of the pick-up lens 1 of this first embodiment.
According to this result as can be known: its result can both satisfy the requirement of spherical aberration, astigmatism and distortion basically, can obtain sufficient optical characteristics.
Second embodiment
Fig. 4 represents the second embodiment of the present invention, in the present embodiment, same with the pick-up lens 1 of structure shown in Figure 1, dispose aperture 2 at first object side of first lens 3, between second of second lens 4 and shooting face 7, dispose cover glass as light filter 6.
Set the pick-up lens 1 of this second embodiment for following condition.
Lens data
L＝3.60mm、fl＝3.11mm、f
1＝4.39mm、f
2＝6.82mm、d
1＝0.75mm、d
2＝0.403mm、d
3＝0.75mm、r4＝-15.152mm、Fno＝3.2
| The sequence number of face | r | d | nd | vd |
| (object point) | ||||
| 1, (first lens, first face) 2, (first lens, second face) 3, (second lens, first face) 4, (second lens, second face) 5, (cover glass first face) 6, (cover glass second face) | 1.055 1.453 4.675 -15.152 0.000 0.000 | 0.750 0.403 0.750 0.000 0.300 | 1.531 1.531 1.516 | 56.0 56.0 64.0 |
| (image planes) | ||||
| The sequence number of face | k | A | | C | D | |
| 1 2 3 4 | -2.17E-1 2.45E 0 -1.20E+4 | 1.56E-2 -6.65E-2 -7.91E-2 -4.25E-2 | -1.00E-1 -6.95E-2 -5.26E-1 5.83E-3 | 5.47E-1 -1.38E-1 1.06E -8.12E-2 | -5.26E-1 8.61E-1 -1.67E 1.71E-2 |
Under such condition, then L/fl=1.16 has satisfied (1) formula.And f
1/ f
2=0.64, satisfied (2) formula.F is arranged again
1/ fl=1.41 has satisfied (3) formula.And then, f
2/ fl=2.19 has satisfied (4) formula.And d
2/ d
1=0.54, satisfied (5) formula.And, d
1/ fl=0.24 has satisfied (6) formula.Also has d
3/ fl=0.24 has satisfied (7) formula.And S=0.0mm has satisfied (8) formula.Have, Bfl/fl=0.51 has satisfied (9) formula again.Also have, Bfl=1.6mm has satisfied (10) formula.In addition, r
4/ fl=-4.872 has satisfied (11) formula.
Fig. 5 represents spherical aberration, astigmatism and the distortion of the pick-up lens 1 of this second embodiment.
According to this result as can be known: its result can both satisfy the requirement of spherical aberration, astigmatism and distortion basically, can obtain sufficient optical characteristics.
The 3rd embodiment
Fig. 6 represents the third embodiment of the present invention, in the present embodiment, same with the pick-up lens 1 of structure shown in Figure 1, dispose aperture 2 at first object side of first lens 3, between second of second lens 4 and shooting face 7, dispose cover glass as light filter 6.In addition, first of first lens 3 is positioned at position than aperture 2 more close object sides by aperture 2.
The pick-up lens 1 of the 3rd embodiment is set following condition for.
Lens data
L＝2.88mm、fl＝2.53mm、f
1＝3.50mm、f
2＝5.21mm、d
1＝0.5mm、d
2＝0.35mm、d
3＝0.55mm、r4＝-2.60mm、Fno＝2.8
| The sequence number of face | r | d | nd | vd |
| (object point) | ||||
| 1, (first lens, first face) 2, (first lens, second face) 3, (second lens, first face) 4, (second lens, second face) 5, (cover glass first face) 6, (cover glass second face) | 0.800 1.100 -40.000 -2.600 0.000 0.000 | 0.500 0.350 0.550 0.000 0.300 | 1.531 1.531 1.516 | 56.0 56.0 64.0 |
| (image planes) | ||||
| The sequence number of face | k | A | | C | D | |
| 1 2 3 4 | -1.78E-1 2.86E -2.44E+5 -9.15E+1 | 9.23E-3 4.36E-2 -2.37E-1 -2.99E-1 | 8.98E-1 -7.07E-1 8.13E-2 3.02E-1 | -4.15E 2.59E -2.15E -4.45E-1 | 9.03E -1.11E 0 -3.77E-2 |
Under such condition, then L/fl=1.14 has satisfied (1) formula.And f
1/ f
2=0.67, satisfied (2) formula.F is arranged again
1/ fl=1.38 has satisfied (3) formula.And then, f
2/ fl=2.06 has satisfied (4) formula.And d
2/ d
1=0.70, satisfied (5) formula.And, d
1/ fl=0.20 has satisfied (6) formula.Also has d
3/ fl=0.22 has satisfied (7) formula.And S=0.10mm has satisfied (8) formula.Have, Bfl/fl=0.58 has satisfied (9) formula again.Also have, Bfl=1.48mm has satisfied (10) formula.In addition, r
4/ fl=-1.03 has satisfied (11) formula.
Fig. 7 represents spherical aberration, astigmatism and the distortion of the pick-up lens 1 of the 3rd embodiment.
According to this result as can be known: its result can both satisfy the requirement of spherical aberration, astigmatism and distortion basically, can obtain sufficient optical characteristics.
The 4th embodiment
Fig. 8 represents the fourth embodiment of the present invention, in the present embodiment, same with the pick-up lens 1 of structure shown in Figure 1, dispose aperture 2 at first object side of first lens 3, between second of second lens 4 and shooting face 7, dispose cover glass as light filter 6.
The pick-up lens 1 of the 4th embodiment is set following condition for.
Lens data
L＝3.78mm、fl＝3.17mm、f
1＝4.71mm、f
2＝5.72mm、d
1＝0.65mm、d
2＝0.45mm、d
3＝0.65mm、r4＝-2.667mm、Fno＝3.2
| The sequence number of face | r | d | nd | vd |
| (object point) | ||||
| 1, (first lens, first face) 2, (first lens, second face) 3, (second lens, first face) 4, (second lens, second face) 5, (cover glass first face) 6, (cover glass second face) | 1.053 1.429 -20.000 -2.667 0.000 0.000 | 0.650 0.450 0.650 0.000 0.300 | 1.531 1.531 1.516 | 56.0 56.0 64.0 |
| (image planes) | ||||
| The sequence number of face | k | A | B | C | D |
| 1 | -1.48E-1 | 3.77E-2 | -2.08E-1 | 7.68E-1 | -1.58E-1 |
| 2 3 4 | 3.77E -2.44E+5 -1.07E+2 | -3.21E-2 -2.25E-1 -3.36E-1 | -5.45E-1 1.39E-1 3.80E-1 | 7.24E-1 -8.12E-1 -4.02E-1 | -2.15E-1 0 8.88E-2 |
Under such condition, then L/fl=1.19 has satisfied (1) formula.And f
1/ f
2=0.82, satisfied (2) formula.F is arranged again
1/ fl=1.49 has satisfied (3) formula.And then, f
2/ fl=1.80 has satisfied (4) formula.And d
2/ d
1=0.69, satisfied (5) formula.And, d
1/ fl=0.21 has satisfied (6) formula.Also has d
3/ fl=0.21 has satisfied (7) formula.And S=0.0mm has satisfied (8) formula.Have, Bfl/fl=0.61 has satisfied (9) formula again.Also have, Bfl=1.93mm has satisfied (10) formula.In addition, r
4/ fl=-0.841 has satisfied (11) formula.
Fig. 9 represents spherical aberration, astigmatism and the distortion of the pick-up lens 1 of the 4th embodiment.
According to this result as can be known: its result can both satisfy the requirement of spherical aberration, astigmatism and distortion basically, can obtain sufficient optical characteristics.
The 5th embodiment
Figure 10 represents the fifth embodiment of the present invention, in the present embodiment, same with the pick-up lens 1 of structure shown in Figure 1, dispose aperture 2 at first object side of first lens 3, between second of second lens 4 and shooting face 7, dispose cover glass as light filter 6.
The pick-up lens 1 of the 5th embodiment is set following condition for.
Lens data
L＝3.16mm、fl＝2.78mm、f
1＝3.85mm、f
2＝5.73mm、d
1＝0.55mm、d
2＝0.38mm、d
3＝0.60mm、r4＝-2.860mm、Fno＝2.8
| The sequence number of face | r | d | nd | vd |
| (object point) | ||||
| 1, (first lens, first face) 2, (first lens, second face) 3, (second lens, first face) 4, (second lens, second face) 5, (cover glass first face) 6, (cover glass second face) | 0.880 1.210 -44.000 -2.860 0.000 0.000 | 0.550 0.380 0.600 0.000 0.300 | 1.531 1.531 1.516 | 56.0 56.0 64.0 |
| (image planes) | ||||
| The sequence number of face | k | A | | C | D | |
| 1 2 3 4 | -1.48E-1 2.86E -2.44E+5 -9.15E+1 | 6.93E-3 3.27E-2 -1.78E-1 -2.25E-1 | 5.57E-1 -4.39E-1 5.05E-2 1.88E-1 | -2.13E 1.33E -1.10E -2.28E-1 | 3.83E -4.69E-1 0 -1.60E-2 |
Under such condition, then L/fl=1.14 has satisfied (1) formula.And f
1/ f
2=0.67, satisfied (2) formula.F is arranged again
1/ fl=1.38 has satisfied (3) formula.And then, f
2/ fl=2.06 has satisfied (4) formula.And d
2/ d
1=0.69, satisfied (5) formula.And, d
1/ fl=0.20 has satisfied (6) formula.Also has d
3/ fl=0.22 has satisfied (7) formula.And S=0.10mm has satisfied (8) formula.Have, Bfl/fl=0.59 has satisfied (9) formula again.Also have, Bfl=1.63mm has satisfied (10) formula.In addition, r
4/ fl=-1.028 has satisfied (11) formula.
Figure 11 represents spherical aberration, astigmatism and the distortion of the pick-up lens 1 of the 5th embodiment.
According to this result as can be known: its result can both satisfy the requirement of spherical aberration, astigmatism and distortion basically, can obtain sufficient optical characteristics.
In addition, the present invention is not limited to the foregoing description, can carry out all changes as required.
For example, can between second of first lens 3 and second lens 4 first, set the luminous flux control panel as required.
Claims (8)
1. a pick-up lens is used for forming subject image on the shooting face of solid-state imager, it is characterized in that:
Be equipped with aperture successively from object side to the image planes side, make and have convex surface towards first lens of the meniscus lens of the positive focal power of object side and make and have second lens of convex surface, and satisfy each conditional of following (1)-(7) formula towards the lens of the positive focal power of image planes side:
1.25≥L/f1≥0.8 (1)
1≥f
1/f
2≥0.55 (2)
1.8≥f
1/f1≥1 (3)
4≥f
2/f1≥1.5 (4)
1≥d
2/d
1≥0.5 (5)
0.27≥d
1/f1≥0.1 (6)
0.27≥d
3/f1≥0.1 (7)
Wherein,
L: the total length of lens combination
F1: the focal length of whole lens combination
f
1: the focal length of first lens
f
2: the focal length of second lens
d
1: the center thickness of first lens
d
2: first lens on the optical axis and the interval of second lens
d
3: the center thickness of second lens.
2. pick-up lens according to claim 1 is characterized in that:
Above-mentioned second lens are made meniscus lens.
3. pick-up lens according to claim 1 is characterized in that:
Near the face of the object side of above-mentioned second lens part optical axis is made to object side and is protruded, and makes the aspheric surface with flex point.
4. pick-up lens according to claim 3 is characterized in that:
The position, outer end of the effective diameter of the face of the object side of above-mentioned second lens is positioned at the position than the more close object side of point on the optical axis of the face of the object side of these second lens.
5. according to each described pick-up lens among the claim 1-4, it is characterized in that:
Said aperture also satisfies the following conditions formula:
0.2≥S (8)
Wherein, S: said aperture on the optical axis and the distance between the optical surface of close object side.
6. according to each described pick-up lens among the claim 1-5, it is characterized in that:
Also satisfy the following conditions formula:
0.8≥Bf1/f1≥0.4 (9)
Wherein, Bf1: back focal length (distance (air characteristic chamber length) on the optical axis from the final face of lens to the shooting face).
7. according to each described pick-up lens among the claim 1-6, it is characterized in that:
Also satisfy the following conditions formula:
2.5≥Bf1≥1.2 (10)
8. according to each described pick-up lens among the claim 1-7, it is characterized in that:
Also satisfy the following conditions formula:
-0.5≥r
4/f1≥-6.0 (11)
Wherein, r
4: the radius-of-curvature of the face of the image planes side of second lens.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004304078 | 2004-10-19 | ||
| JP2004304078 | 2004-10-19 | ||
| JP2005142731 | 2005-05-16 | ||
| JP2005226265 | 2005-08-04 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1763578A true CN1763578A (en) | 2006-04-26 |
| CN100485436C CN100485436C (en) | 2009-05-06 |
Family
ID=36747810
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005101094327A Expired - Fee Related CN100485436C (en) | 2004-10-19 | 2005-10-18 | Pick-up lens |
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| Country | Link |
|---|---|
| CN (1) | CN100485436C (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012040911A1 (en) * | 2010-09-28 | 2012-04-05 | Ether Precision, Inc. | Lens module for image capture |
| CN101937124B (en) * | 2009-06-30 | 2013-01-30 | 比亚迪股份有限公司 | Optical lens component |
| CN103299228A (en) * | 2010-09-28 | 2013-09-11 | 亚太光电股份有限公司 | Lens module for image capture |
| CN105549182A (en) * | 2016-02-19 | 2016-05-04 | 南京昂驰光电科技有限公司 | Novel miniature optical lens set |
| CN105572846A (en) * | 2016-02-19 | 2016-05-11 | 南京昂驰光电科技有限公司 | Novel micro optical lens |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ATE300751T1 (en) * | 2002-04-16 | 2005-08-15 | Konishiroku Photo Ind | MINIATURE IMAGE CAPTURE LENS AND MOBILE DEVICE EQUIPPED THEREOF |
| JP4269334B2 (en) * | 2002-10-28 | 2009-05-27 | コニカミノルタホールディングス株式会社 | Imaging lens, imaging unit, and portable terminal |
| KR20040049794A (en) * | 2002-12-06 | 2004-06-12 | 가부시키가이샤 엔프라스 | Image pickup lens |
-
2005
- 2005-10-18 CN CNB2005101094327A patent/CN100485436C/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101937124B (en) * | 2009-06-30 | 2013-01-30 | 比亚迪股份有限公司 | Optical lens component |
| WO2012040911A1 (en) * | 2010-09-28 | 2012-04-05 | Ether Precision, Inc. | Lens module for image capture |
| CN103299228A (en) * | 2010-09-28 | 2013-09-11 | 亚太光电股份有限公司 | Lens module for image capture |
| CN103403600A (en) * | 2010-09-28 | 2013-11-20 | 亚太光电股份有限公司 | Lens module for image capture |
| CN103403600B (en) * | 2010-09-28 | 2015-11-25 | 亚太光电股份有限公司 | Optical module |
| US9354424B2 (en) | 2010-09-28 | 2016-05-31 | AO Ether Corporation | Lens module for image capture |
| CN105549182A (en) * | 2016-02-19 | 2016-05-04 | 南京昂驰光电科技有限公司 | Novel miniature optical lens set |
| CN105572846A (en) * | 2016-02-19 | 2016-05-11 | 南京昂驰光电科技有限公司 | Novel micro optical lens |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100485436C (en) | 2009-05-06 |
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