CN101131466B - Zoom lens system and electronic image pickup apparatus using the same - Google Patents

Zoom lens system and electronic image pickup apparatus using the same Download PDF

Info

Publication number
CN101131466B
CN101131466B CN2007101477041A CN200710147704A CN101131466B CN 101131466 B CN101131466 B CN 101131466B CN 2007101477041 A CN2007101477041 A CN 2007101477041A CN 200710147704 A CN200710147704 A CN 200710147704A CN 101131466 B CN101131466 B CN 101131466B
Authority
CN
China
Prior art keywords
lens
mentioned
lens combination
combination
positive
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CN2007101477041A
Other languages
Chinese (zh)
Other versions
CN101131466A (en
Inventor
左部校之
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Olympus Corp
Original Assignee
Olympus Imaging Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP2006229300A external-priority patent/JP4906439B2/en
Application filed by Olympus Imaging Corp filed Critical Olympus Imaging Corp
Publication of CN101131466A publication Critical patent/CN101131466A/en
Application granted granted Critical
Publication of CN101131466B publication Critical patent/CN101131466B/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Abstract

There is disclosed a zoom lens system comprising: in order from an object side, a first lens unit having a positive refractive power; a second lens unit having a negative refractive power; a third lens unit having a positive refractive power; and a fourth lens unit having a refractive power, during zooming from a wide-angle end to a telephoto end, a space between the first lens unit and the second lens unit, a space between the second lens unit and the third lens unit and a space between the third lens unit and the fourth lens unit are changed, and the second lens unit includes two lenses of a negative lens and a positive lens in order from the object side.

Description

Zoom lens and the electronic image pickup device that uses this zoom lens
The application advocates right of priority 2006-229300 number to Japanese patent application 2006-229220 number that proposes in Japan on August 25th, 2006 with on August 25th, 2006 at the Japanese patent application that Japan proposes, and has quoted their content in this merging.
Technical field
The electronic image pickup device that the present invention relates to zoom lens and used this zoom lens.
Background technology
In the last few years, replace the silver halide film camera, the digital camera that uses CCD and the such electro-photographic element of CMOS to take subject becomes main flow.And then it has plurality of classes with the high-performance type from business in the such broad range of the universal type of compact.The user of the digital camera of this popular style wishes to enjoy in various scenes easily whenever and wherever possible to take.Therefore, small-sized commodity, particularly be easy to put into the pocket etc. of clothes or bag and the digital camera of portable, that the thickness direction size is thin type is subjected to people and welcomes.
On the other hand, the multiplying power of compact digital camera change is than being generally about 3 times, but require now than in the past more high magnification change the camera of ratio.As the zoom lens that is easy to keep than high magnification change ratio, the known zoom lens that following type is arranged, this zoom lens has the 1st lens combination of positive light coke, the 2nd lens combination of negative power, the 3rd lens combination of positive light coke and the 4th lens combination of positive light coke from object side.
And the size of thickness direction is mainly determined by the size of lens barrel in the camera size, so in order to reach the slimming of camera, effectively make the lens barrel slimming.
Recently lens barrel is stretched out in camera main-body and its so-called Collapsible-type lens barrel that is accommodated in the camera main-body is commonplace when carrying.Therefore, require realization to consider the zoom lens of the slimming of telescopic lens barrel.For example in TOHKEMY 2004-258240 communique, TOHKEMY 2004-199000 communique, TOHKEMY 2001-133687 communique and the Japanese kokai publication hei 11-119100 communique, by constituting the 2nd lens combination, thereby take to reduce the measure of the size on the thickness direction of the 2nd lens combination with negative lens and these 2 lens of positive lens.
But there is following problem in above-mentioned prior art.
In the 4th embodiment of TOHKEMY 2004-258240 communique, thereby the quantity of the formation lens of the 2nd lens combination is made as 2 influences that produce aberrations, makes the lens number of zoom lens integral body become many in order to reduce aberration.Even therefore adopt stretch mode also to be unfavorable for the abundant miniaturization of lens barrel.
And the lens numbers sum of the 1st lens combination and the 2nd lens combination is 5.Like this, if in order to ensure the field angle of wide-angle side, just can't reduce in the 1st lens combination to be unfavorable for the miniaturization of lens barrel on diametric(al) from the diameter of the nearest lens of object side.Even and adopt stretch mode also to be unfavorable for the miniaturization of its thickness on optical axis direction.
In the 5th embodiment of TOHKEMY 2004-199000 communique, the formation quantity of camera lens is 7,6th, the formation number among the 7th embodiment is 8, all fewer, but the negative power that suppresses the 2nd lens combination for the influence of the aberration that suppresses the 2nd lens combination, its result will make the multiplying power change is unfavorable for that than stopping at about 3 times high magnification changes ratioization.
In addition in the described zoom lens of TOHKEMY 2004-199000 communique, the lens numbers of the 1st lens combination and the 2nd lens combination adds up to 3, in Japanese kokai publication hei 11-119100 communique and the described zoom lens of TOHKEMY 2001-133687 communique, the lens numbers of the 1st lens combination and the 2nd lens combination adds up to 4, but all be difficult to suppress the influence of the aberration change of the 1st lens combination and the 2nd lens combination, multiplying power changes than not reaching 3 times.
Summary of the invention
The present invention finishes in view of the above problems, its purpose is to provide a kind of zoom lens, this zoom lens has the 1st lens combination of positive light coke, the 2nd lens combination of negative power, the 3rd lens combination of positive light coke and the 4th lens combination of positive light coke, and it is easy to guarantee miniaturization and aberration performance.
And the present invention also aims to provide a kind of electronic image pickup device that is easy to realize miniaturization with above-mentioned zoom lens.
In a first aspect of the present invention, zoom lens of the present invention has the 1st lens combination of positive light coke in order from object side, the 2nd lens combination of negative power, the 3rd lens combination of positive light coke and have the 4th lens combination of positive light coke, changing multiplying power in telescope end from wide-angle side, the interval of above-mentioned the 1st lens combination and above-mentioned the 2nd lens combination, the interval of above-mentioned the 2nd lens combination and above-mentioned the 3rd lens combination, the interval of above-mentioned the 3rd lens combination and above-mentioned the 4th lens combination changes, above-mentioned the 2nd lens combination comprises negative lens in order from object side, these 2 lens of positive lens, and meet the following conditions:
1.88＜n d2p＜2.20(1A)
13.0＜v d2p＜30.0(2A)
Wherein, n D2pBe that positive lens in the 2nd lens combination is for refractive index, the v of d line D2pIt is Abbe (Abbe) number of the positive lens in the 2nd lens combination.
In a second aspect of the present invention, zoom lens of the present invention has the 1st lens combination of positive light coke in order from object side, the 2nd lens combination of negative power, the 3rd lens combination of positive light coke and the 4th lens combination with focal power, changing multiplying power in telescope end from wide-angle side, the interval of above-mentioned the 1st lens combination and above-mentioned the 2nd lens combination, the interval of above-mentioned the 2nd lens combination and above-mentioned the 3rd lens combination, the interval of above-mentioned the 3rd lens combination and above-mentioned the 4th lens combination changes, above-mentioned the 1st lens combination comprises positive lens and these 2 lens of negative lens, lens in above-mentioned the 1st lens combination add up to 2, above-mentioned the 2nd lens combination comprises negative lens in order from object side, these 2 lens of positive lens, lens in above-mentioned the 2nd lens combination add up to 2, and meet the following conditions:
1.78＜n d2n＜2.10(1B)
35.0＜v d2n＜50.0(2B)
Wherein, n D2nBe that negative lens in the 2nd lens combination is for refractive index, the v of d line D2nIt is the Abbe number of the negative lens in the 2nd lens combination.
In first aspect, by the 2nd lens combination with negative power is taken measures, thereby can provide a kind of lens number zoom lens few and compact, that be easy to keep optical property of the 2nd lens combination.
In second aspect, by the 1st lens combination with positive light coke and the 2nd lens combination with negative power are taken measures, thereby can provide the lens number zoom lens few and compact, that be easy to keep optical property of a kind of the 1st lens combination and the 2nd lens combination.
By using these zoom lens, can provide the electronic image pickup device that is easy to miniaturization in addition.
According to the specifying of following embodiment, accompanying drawing and claim, other features and advantages of the present invention will obtain imbody.
Description of drawings
According to following specifying and accompanying drawing, will further complete understanding be arranged to the present invention.Below specify with accompanying drawing only be illustration, the present invention is not limited to this.
Figure 1A is the sectional view that comprises optical axis in infintie object point when focusing of the embodiment 1 of zoom lens of the present invention to Fig. 1 C, and Figure 1A is the camera lens sectional view of wide-angle side, and Figure 1B is the camera lens sectional view of intermediateness, and Fig. 1 C is the camera lens sectional view of telescope end.
Fig. 2 A is the sectional view that comprises optical axis in infintie object point when focusing of the embodiment 2 of zoom lens of the present invention to Fig. 2 C, and Fig. 2 A is the camera lens sectional view of wide-angle side, and Fig. 2 B is the camera lens sectional view of intermediateness, and Fig. 2 C is the camera lens sectional view of telescope end.
Fig. 3 A is the sectional view that comprises optical axis in infintie object point when focusing of the embodiment 3 of zoom lens of the present invention to Fig. 3 C, and Fig. 3 A is the camera lens sectional view of wide-angle side, and Fig. 3 B is the camera lens sectional view of intermediateness, and Fig. 3 C is the camera lens sectional view of telescope end.
Fig. 4 A is the sectional view that comprises optical axis in infintie object point when focusing of the embodiment 4 of zoom lens of the present invention to Fig. 4 C, and Fig. 4 A is the camera lens sectional view of wide-angle side, and Fig. 4 B is the camera lens sectional view of intermediateness, and Fig. 4 C is the camera lens sectional view of telescope end.
Fig. 5 A is the sectional view that comprises optical axis in infintie object point when focusing of the embodiment 5 of zoom lens of the present invention to Fig. 5 C, and Fig. 5 A is the camera lens sectional view of wide-angle side, and Fig. 5 B is the camera lens sectional view of intermediateness, and Fig. 5 C is the camera lens sectional view of telescope end.
Fig. 6 A is the sectional view that comprises optical axis in infintie object point when focusing of the embodiment 6 of zoom lens of the present invention to Fig. 6 C, and Fig. 6 A is the camera lens sectional view of wide-angle side, and Fig. 6 B is the camera lens sectional view of intermediateness, and Fig. 6 C is the camera lens sectional view of telescope end.
Fig. 7 A is the sectional view that comprises optical axis in infintie object point when focusing of the embodiment 7 of zoom lens of the present invention to Fig. 7 C, and Fig. 7 A is the camera lens sectional view of wide-angle side, and Fig. 7 B is the camera lens sectional view of intermediateness, and Fig. 7 C is the camera lens sectional view of telescope end.
Fig. 8 A is the sectional view that comprises optical axis in infintie object point when focusing of the embodiment 8 of zoom lens of the present invention to Fig. 8 C, and Fig. 8 A is the camera lens sectional view of wide-angle side, and Fig. 8 B is the camera lens sectional view of intermediateness, and Fig. 8 C is the camera lens sectional view of telescope end.
Fig. 9 A is the sectional view that comprises optical axis in infintie object point when focusing of the embodiment 9 of zoom lens of the present invention to Fig. 9 C, and Fig. 9 A is the camera lens sectional view of wide-angle side, and Fig. 9 B is the camera lens sectional view of intermediateness, and Fig. 9 C is the camera lens sectional view of telescope end.
Figure 10 A is spherical aberration (SA), astigmatism (FC), distorton aberration (DT), the aberration diagram of multiplying power chromatic aberation (CC) in infintie object point when focusing of the embodiment 1 of expression zoom lens of the present invention to Figure 10 C, Figure 10 A is the constitutional diagram of wide-angle side, Figure 10 B is the constitutional diagram of intermediateness, and Figure 10 C is the constitutional diagram of telescope end.
Figure 11 A is spherical aberration (SA), astigmatism (FC), distorton aberration (DT), the aberration diagram of multiplying power chromatic aberation (CC) in infintie object point when focusing of the embodiment 2 of expression zoom lens of the present invention to Figure 11 C, Figure 11 A is the constitutional diagram of wide-angle side, Figure 11 B is the constitutional diagram of intermediateness, and Figure 11 C is the constitutional diagram of telescope end.
Figure 12 A is spherical aberration (SA), astigmatism (FC), distorton aberration (DT), the aberration diagram of multiplying power chromatic aberation (CC) in infintie object point when focusing of the embodiment 3 of expression zoom lens of the present invention to Figure 12 C, Figure 12 A is the constitutional diagram of wide-angle side, Figure 12 B is the constitutional diagram of intermediateness, and Figure 12 C is the constitutional diagram of telescope end.
Figure 13 A is spherical aberration (SA), astigmatism (FC), distorton aberration (DT), the aberration diagram of multiplying power chromatic aberation (CC) in infintie object point when focusing of the embodiment 4 of expression zoom lens of the present invention to Figure 13 C, Figure 13 A is the constitutional diagram of wide-angle side, Figure 13 B is the constitutional diagram of intermediateness, and Figure 13 C is the constitutional diagram of telescope end.
Figure 14 A is spherical aberration (SA), astigmatism (FC), distorton aberration (DT), the aberration diagram of multiplying power chromatic aberation (CC) in infintie object point when focusing of the embodiment 5 of expression zoom lens of the present invention to Figure 14 C, Figure 14 A is the constitutional diagram of wide-angle side, Figure 14 B is the constitutional diagram of intermediateness, and Figure 14 C is the constitutional diagram of telescope end.
Figure 15 A is spherical aberration (SA), astigmatism (FC), distorton aberration (DT), the aberration diagram of multiplying power chromatic aberation (CC) in infintie object point when focusing of the embodiment 6 of expression zoom lens of the present invention to Figure 15 C, Figure 15 A is the constitutional diagram of wide-angle side, Figure 15 B is the constitutional diagram of intermediateness, and Figure 15 C is the constitutional diagram of telescope end.
Figure 16 A is spherical aberration (SA), astigmatism (FC), distorton aberration (DT), the aberration diagram of multiplying power chromatic aberation (CC) in infintie object point when focusing of the embodiment 7 of expression zoom lens of the present invention to Figure 16 C, Figure 16 A is the constitutional diagram of wide-angle side, Figure 16 B is the constitutional diagram of intermediateness, and Figure 16 C is the constitutional diagram of telescope end.
Figure 17 A is spherical aberration (SA), astigmatism (FC), distorton aberration (DT), the aberration diagram of multiplying power chromatic aberation (CC) in infintie object point when focusing of the embodiment 8 of expression zoom lens of the present invention to Figure 17 C, Figure 17 A is the constitutional diagram of wide-angle side, Figure 17 B is the constitutional diagram of intermediateness, and Figure 17 C is the constitutional diagram of telescope end.
Figure 18 A is spherical aberration (SA), astigmatism (FC), distorton aberration (DT), the aberration diagram of multiplying power chromatic aberation (CC) in infintie object point when focusing of the embodiment 9 of expression zoom lens of the present invention to Figure 18 C, Figure 18 A is the constitutional diagram of wide-angle side, Figure 18 B is the constitutional diagram of intermediateness, and Figure 18 C is the constitutional diagram of telescope end.
Figure 19 is the place ahead stereographic map of outward appearance of the embodiment of expression digital camera of the present invention.
Figure 20 is the back view of the digital camera of Figure 19.
Figure 21 is the schematic sectional view of the digital camera of Figure 19.
Embodiment
In the zoom lens of a first aspect of the present invention, this zoom lens has the 1st lens combination of positive light coke in order from object side, the 2nd lens combination of negative power, the 3rd lens combination of positive light coke and the 4th lens combination of positive light coke, changing multiplying power in telescope end from wide-angle side, the interval of the 1st lens combination and the 2nd lens combination, the interval of the 2nd lens combination and the 3rd lens combination, the interval of the 3rd lens combination and the 4th lens combination changes, the 2nd lens combination comprises negative lens in order from object side, these 2 lens of positive lens, and meet the following conditions (1A), (2A): 1.88＜n D2p＜2.20 (1A), 13.0＜v D2p＜30.0 (2A).Wherein, n D2pBe that positive lens in the 2nd lens combination is for refractive index, the v of d line D2pIt is the Abbe number of the positive lens in the 2nd lens combination.
As mentioned above, thisly have the 1st lens combination of positive light coke, the 2nd lens combination of negative power, the 3rd lens combination of positive light coke and the 4th lens combination of positive light coke in order if adopt from object side, change the structure of multiplying power by changing each interval of organizing, then can make each lens combination share the responsibility of change overriding efficiently.This can suppress the aberration change of change during multiplying power less, prevents that the mobile quantitative change of each lens combination is big, can help the densification of zoom lens.
And by constituting the 2nd lens combination with negative lens and these 2 of positive lenss in order from object side, thereby can reduce the size of lens combination on thickness direction, can also reduce the size on the external diameter direction.Because the height of incidence (from the height of optical axis) of off-axis ray uprises easily in the 2nd lens combination, so if the edge thickness of desiring to guarantee lens for necessary thickness, will produce the tendency that a last thickness is easy to thickening.
And, if the change of the lens number of the 2nd lens combination can become higher by the off-axis ray height of the 2nd lens combination at most, be used to guarantee the last bigger thickness of thickness needs of axle of edge thickness.Certainly corresponding to the recruitment of the lens number of the 2nd lens combination, thickness also can the thickening respective thickness on the axle.
According to this viewpoint, by constituting the 2nd lens combination with 2 so less lens, thereby can reduce this lens combination diametrically size and the thickness on the optical axis, the densification of the lens barrel when helping flexible state.
Even and in order under the situation that constitutes the 2nd lens combination with 2 lens, also can fully to carry out aberration correction, the positive lens of the 2nd lens combination is satisfied condition (1A), (2A).This is for the refractive index of d line and the condition of Abbe number about the positive lens in the 2nd lens combination.
Because the 2nd lens combination becomes big lens combination easily for change multiplying power burden, so have big negative magnification mostly.Therefore, in order to proofread and correct the aberration that produces by 1 positive lens in the negative lens of the 2nd lens combination, it is effective adopting the refractive index of suitably setting these lens, the method for chromatic dispersion (dispersion).
Condition (1A) is about the correction of curvature of the image and coma aberration and the condition of cost.By making n D2pBe not higher than the upper limit of condition (1A), thereby be easy to suppress the cost and the manufacturing cost of employed material.If n D2pThe then employed material of the upper limit that is higher than condition (1A) can be very expensive, becomes unmanageable material.
By making n D2pBe not less than the lower limit of condition (1A), thereby also be easy to guarantee focal power even the curvature of lens face diminishes.
Its result can suppress wide-angle side curvature of the image, can also reduce the coma aberration of positive lens self etc., the aberration change when being easy to suppress the generation of coma aberration etc. of wide-angle side and telescope end and change multiplying power.
Condition (2A) is the condition of proofreading and correct about the outer multiplying power chromatic aberation of chromatic aberation correction, particularly axle.In order will in this lens combination, to proofread and correct well, preferably make positive lens have the chromatic dispersion of appropriateness by the chromatic aberation that negative lens produced of the 2nd lens combination.
By making v D2pThe higher limit that is not higher than conditional (2), thus can guarantee the chromatic dispersion of positive lens, offset with the chromatic aberation that in the negative lens of the 2nd lens combination, produces, help reducing the at random of captured color of image.
By making v D2pBe not less than the lower limit of condition (2), thereby the chromatic dispersion that can suppress in the short wavelength zone is excessive, helps reducing the at random of color in 2 grades of spectrum (secondary spectrum).
About each condition, more preferably following condition.
1.90＜n d2p＜2.16(1A’)
15.0＜v d2p＜25.0(2A’)
More preferably following condition.
1.92＜n d2p＜2.11(1A”)
17.0＜v d2p＜21.0(2A”)
Can further obtain above-mentioned effect by these conditions.
And, made up the open item that belongs to the application about the setting of the higher limit of a plurality of conditions of identical parameters and lower limit New Terms.That is, for example the lower limit of the lower limit of combination condition (1A) and condition (1A ') is come new settings " 1.88＜n D2p＜2.16 " such condition belongs in the application's scope.Not only for given an example about n D2pCondition be like this, also identical for condition about other parameters.
In order not only to realize densification but also obtain efficient and good optical performance, more preferably except above-mentioned measure, also take other various measures.Describe in detail below.
In order more effectively to proofread and correct the aberration in the 2nd lens combination, preferably making the positive lens of the 2nd lens combination is protruding meniscus shape at object side, suppresses the incident angle of axle outer light beam.At this moment, the shape of the positive lens of preferred the 2nd lens combination satisfies following condition (3A).
-5.0＜SF 2p＜-1.0(3A)，
SF wherein 2pBy SF 2p=(R 2pf+ R 2pr)/(R 2pf-R 2pr) define R 2pfBe the paraxial radius-of-curvature of the object side of the above-mentioned positive lens in above-mentioned the 2nd lens combination, R 2prIt is the paraxial radius-of-curvature of the picture side of the above-mentioned positive lens in above-mentioned the 2nd lens combination.
Do not make SF 2pThe upper limit that is higher than condition (3A) is guaranteed the curvature of the object side of these lens, thereby helps the astigmatism of wide-angle side and the spherical aberration correction of telescope end.
Do not make SF 2pBe lower than the lower limit of condition (3A), the curvature that suppresses lens face becomes excessive, thereby is easy to suppress the generation of the outer high order aberration of axle.Particularly, help the outer curvature of the image of axle and the reduction of multiplying power chromatic aberation.
More preferably following condition.
-3.8＜SF 2p＜-1.4(3A’)
Further preferably satisfy following condition.
-2.6＜SF 2p＜-1.8(3A”)
Can further obtain above-mentioned effect by these conditions.
The magnification of preferred the 2nd lens combination satisfies following condition (4A).
0.12＜|f 2/f t|＜0.60(4A)，
Wherein, f 2Be the focal length of above-mentioned the 2nd lens combination, f tIt is the focal length of the above-mentioned zoom lens of telescope end.
By making | f 2/ f t| be not higher than the upper limit of condition (4A), thereby can guarantee the magnification of the 2nd lens combination, be easy to obtain multiplying power change ratio, help the densification of lens barrel corresponding to the interval variation amount of the 1st, the 2nd lens combination.
And preferably by making | f 2/ f t| be not less than the lower limit of condition (4A), thereby the magnification that suppresses the 2nd lens combination suppresses aberration.
More preferably following condition.
0.18＜|f 2/f t|＜0.49(4A’)
Further preferably satisfy following condition.
0.24＜|f 2/f t|＜0.38(4A”)
Can further obtain above-mentioned effect by these conditions.
The negative lens of preferred the 2nd lens combination satisfies following condition (5A) and (6A).
1.76＜n d2n＜2.00(5A)
35.0＜v d2n＜50.0(6A)
Wherein, n D2nBe that above-mentioned negative lens in above-mentioned the 2nd lens combination is for the refractive index of d line, v D2nIt is the Abbe number of the above-mentioned negative lens in above-mentioned the 2nd lens combination.
Condition (5A) is the EQUILIBRIUM CONDITION about cost and aberration correction function.
By making n D2nBe not higher than the upper limit of condition (5A), thereby be easy to suppress cost, the manufacturing cost of material therefor.If n D2nThe upper limit that is higher than condition (5A), then the material therefor costliness that becomes becomes unmanageable material.
By making n D2nBe not less than the lower limit of condition (5A), thereby also be easy to guarantee the focal power born even reduced the curvature of lens face.
The distorton aberration that its result can suppress the barrel shape of wide-angle side becomes excessive, can also reduce the coma aberration of negative lens self etc., the aberration change when being easy to suppress the generation of coma aberration etc. of wide-angle side and telescope end and change multiplying power.
Condition (6A) is the condition of proofreading and correct about the outer multiplying power chromatic aberation of chromatic aberation correction, particularly axle.
Preferably make v D2nThe upper limit that is not higher than condition (6A), the refractive index of guaranteeing material therefor is to be easy to carry out aberration correction.If v D2nThe upper limit that is higher than condition (6A), though then favourable on chromatic aberation is proofreaied and correct, utilize existing lens material refractive index to diminish easily.
Preferably make v D2nBe not less than the lower limit of condition (6A), reduce color dispersion, be easy to suppress chromatic aberation.
More preferably following condition.
1.78＜n d2n＜1.95(5A’)
39.0＜v d2n＜45.0(6A’)
Further preferably satisfy following condition.
1.80＜n d2n＜1.90(5A”)
40.0＜v d2n＜43.0(6A”)
Can further obtain above-mentioned effect by these conditions.
In above-mentioned zoom lens, only with negative lens, when these 2 lens of positive lens constitute the 2nd lens combination, the function of the negative magnification that the negative lens of the 2nd lens combination burden is bigger.In order in whole change multiplying power zone, to guarantee high optical property, preferably suppress the aberration that produces in this negative lens less as far as possible.
For this reason, preferably these lens have big magnification as biconcave lens.And preferably become the shape that satisfies following condition (7A).
0.35＜SF 2n＜1.00(7A)，
SF wherein 2nBy SF 2n=(R 2nf+ R 2nr)/(R 2nf-R 2nr) define R 2nfBe the paraxial radius-of-curvature of the object side of the above-mentioned negative lens in the 2nd lens combination, R 2nrIt is the paraxial radius-of-curvature of the picture side of the above-mentioned negative lens in the 2nd lens combination.
By making SF 2nThe upper limit that is not higher than condition (7A) suppresses the curvature of the picture side of negative lens, thereby is easy to suppress the generation of the curvature of the image at wide-angle side place.And the axle that is easy to suppress the 2nd lens combination is gone up thickness.And be easy to suppress the last thickness of axle of the 2nd lens combination and guarantee image quality.
By making SF 2nBe not less than the lower limit of condition (7A), suppress the negative curvature of the object side of negative lens, thereby be easy to suppress outer each aberration of axle at wide-angle side place.
More preferably satisfy following condition.
0.45＜SF 2n＜0.85(7A’)
Further preferably satisfy following condition.
0.55＜SF 2n＜0.70(7A”)
Can further obtain above-mentioned effect by these conditions.
And obtain the good optical performance for the generation that suppresses aberration, preferably at least 1 lens face of the negative lens of the 2nd lens combination, dispose aspheric surface.But also can with the object side of this negative lens be made as aspheric surface as the two sides, side.
In these cases, (8A) more preferably meets the following conditions.
0.030＜(|ASP 2nf|+|ASP 2nr|)/f w＜0.320(8A)，
Wherein, ASP 2nfBe the aspheric surface side-play amount (aspherical displacement) on the lens face of object side of the above-mentioned negative lens in above-mentioned the 2nd lens combination, ASP 2nrBe the aspheric surface side-play amount on the lens face of picture side of the above-mentioned negative lens in above-mentioned the 2nd lens combination, f wIt is the focal length of the above-mentioned zoom lens at wide-angle side place.
The aspheric surface side-play amount is to be injected into when wide-angle side on the position of maximum height of incidence of light of this lens face, along the distance that the orientation measurement that is parallel to optical axis arrives from the benchmark sphere to this lens face, and will be towards situation about measuring as plus sign as side.Herein, the benchmark sphere be have the radius-of-curvature identical with the paraxial radius-of-curvature of this lens face, (vertex) contacts with this lens face on the summit sphere.Aspheric surface side-play amount when lens face is sphere or plane is 0.
By make (| ASP 2nf|+| ASP 2nr|)/f wThe upper limit that is not higher than condition (8A) makes the absolute value sum of aspheric surface side-play amount not excessive, thereby is easy to suppress because foozle and the deterioration that produces the optical property when eccentric between the face of non-spherical lens.
Preferably by make (| ASP 2nf|+| ASP 2nr|)/f wBe not less than the lower limit of condition (8A), guarantee the absolute value sum of aspheric surface side-play amount, guarantee the effect of the aberration correction that aspheric surface causes.
More preferably satisfy following condition.
0.040＜(|ASP 2nf|+|ASP 2nr|)/f w＜0.250(8A’)
Further preferably satisfy following condition.
0.050＜(|ASP 2nf|+|ASP 2nr|)/f w＜0.180(8A”)
Can further obtain above-mentioned effect by these conditions.
And the 2nd the aspheric surface of negative lens in the lens combination be preferably more away from the optical axis big more aspheric surface of focal power then.Herein, so-called focal power change means that greatly negative focal power diminishes or positive focal power becomes big.Be easy to suppress the distorton aberration and the coma aberration at wide-angle side place thus.
And then preferably to make the negative lens in the 2nd lens combination be biconcave lens, the object side of this biconcave lens, all is more away from the optical axis big more aspheric surface of focal power then as the side.
This had not only helped realizing that the axle of the 2nd lens combination was gone up or the miniaturization of the thickness of peripheral part but also help realizing the reduction of each aberration in the 2nd lens combination.
And preferably constitute the 1st lens combination by the lens below 2.
Because the 1st lens combination also similarly is positioned on the higher position of height on the optical axis of distance axis UV light with the 2nd lens combination, so be necessary thickness if want the edge thickness of guaranteeing lens, then axle is gone up the easy thickening of thickness.And if the number of lenses quantitative change at most off-axis ray luminosity can uprise all the more, the axle that is used to guarantee edge thickness is gone up thickness and need be bigger thickness.Corresponding to the recruitment of lens number, also thickening corresponding thickness of thickness on the axle.
Therefore, along with increasing of lens number, the radial dimension of the 1st lens combination and axle are gone up thickness can become excessive.According to this viewpoint, preferably by constituting the 1st lens combination with the lens below 2 to realize densification.
And by constituting the 1st lens combination with negative lens and these 2 lens of positive lens in order from object side, thereby help reducing chromatic aberation etc., realize the densification of lens barrel simultaneously.
And by disposing negative lens and positive lens in order, thereby both can have the chromatic aberation calibration function, be easy to suppress to change the change of each aberration that multiplying power causes again.
The negative lens of the 1st lens combination and positive lens are engaged with each other.If for engaging lens, then can be by high magnification change ratioization, spool upward chromatic aberation that effectively focal length of telescope end is become easily problem when elongated is proofreaied and correct.That can also suppress that assembly error causes results from the lens deterioration of eccentric optical property relatively, the raising of yield rate and cost is reduced contributing.
The negative lens of the 1st lens combination and positive lens also can be the simple lenses independent of each other that does not engage.Like this, the plane of refraction of the 1st lens combination has 4 faces, has improved the degree of freedom of design, so can more effectively proofread and correct the coma aberration of the distorton aberration and the telescope end of wide-angle side.
And following condition is preferably satisfied at the negative lens of above-mentioned the 1st lens combination and the interval of positive lens
(9A)。
0.0≤L 1np/L 1＜0.2(9A)，
Wherein, L 1npBe that the above-mentioned negative lens of the 1st lens combination and the axle of above-mentioned positive lens are gone up at interval L 1The axle that is above-mentioned the 1st lens combination is gone up gross thickness.
By making L 1np/ L 1The upper limit that is not higher than condition (9A), thus can suppress to reduce the effective diameter of these lens, even help zoom lens integral body densification diametrically by the off-axis ray height of the lens of close object side.And L in the reality 1np/ L 1Can not be lower than the lower limit of condition (9A).
More preferably satisfy following condition.
0.0≤L 1np/L 1＜0.15(9A’)
Further preferably satisfy following condition.
0.0≤L 1np/L 1＜0.10(9A”)
Can further obtain above-mentioned effect by these conditions.
In order to realize the slimming of lens barrel, preferably constitute the 3rd lens combination with the lens below 3.
When hope makes the zoom lens miniaturization, preferably constitute the 3rd lens combination by positive lens, these 2 lens of negative lens in order from object side.
By constituting, can realize the slimming of lens barrel by the minimum lens number that is used for proofreading and correct each aberration such as chromatic aberation that the 3rd lens combination produces.And by such configuration lens, thereby the front side principal point is positioned near on the position of object, be easy to guarantee the multiplying power change than and suppress the amount of movement of lens combination less, this point also helps densification.
Guarantee in hope under the situation of higher optical property, also can constitute the 3rd lens combination by these 3 lens of positive lens, positive lens and negative lens in order from object side.
By adopting the structure of such lens configuration, can mainly share the positive amplification ratio of the 3rd lens combination by 2 positive lenss, help the correction of spherical aberration and coma aberration.
And the negative lens of preferred the 3rd lens combination engages with the positive lens of adjacent object side.By joint positive lens and negative lens, thereby can more effectively carry out the correction of a last chromatic aberation.And owing to can prevent the deterioration of the lens eccentric relatively optical property that causes each other in the assembling procedure, thereby realize that the raising of yield rate and cost reduce.
The aspheric surface of configuration more than 1 has effect to correcting spherical aberration and coma aberration in the 3rd lens combination.More preferably the positive lens of close object side of the 3rd lens combination is a double-sized non-spherical.
If in a plurality of lens, dispose aspheric surface then easy the change greatly of the eccentric relatively optical property deterioration that causes of lens, but by two sides that make 1 lens like this is aspheric surface, then the eccentric relatively optical property that causes of lens can be worsened and suppress lessly, and correcting spherical aberration and coma aberration better.
Constituting with lens under the situation of the 3rd lens combination especially, by the degree of freedom that aspheric surface can improve design is set, this is not only realizing miniaturization but also guarantee that aspect the optical property two be preferred.
And according to the viewpoint of the balance of densification and optical property, preferred the 1st lens combination satisfies following condition (10A).
0.50＜f 1/f t＜2.00(10A)，
F wherein 1Be the focal length of above-mentioned the 1st lens combination, f tIt is the focal length of the above-mentioned zoom lens of telescope end.
By making f 1/ f tThe upper limit that is not higher than condition (10A) is guaranteed the magnification of the 1st lens combination, thereby is easy to suppress the total length of zoom lens, helps the miniaturization of lens barrel.
By making f 1/ f tBe not less than the lower limit of condition (10A), thereby can suppress the magnification of the 1st lens combination, can suppress the generation of the spherical aberration and the coma aberration of telescope end, be easy to guarantee the good optical performance.
More preferably satisfy following condition.
0.75＜f 1/f t＜1.80(10A’)
Further preferably satisfy following condition.
0.95＜f 1/f t＜1.60(10A”)
Can further obtain above-mentioned effect by these conditions.
The magnification of preferred the 3rd lens combination satisfies following condition (11A).
0.16＜f 3/f t＜0.80(11A)，
F wherein 3Be the focal length of above-mentioned the 3rd lens combination, f tIt is the focal length of the above-mentioned zoom lens of telescope end.
Make f 3/ f tThe upper limit that is not higher than condition (11A) is guaranteed the magnification of the 3rd lens combination, guarantees the change multiplying power burden in the 3rd lens combination, and these are preferred from the miniaturization viewpoint.
Preferably make f 3/ f tBe not less than the lower limit of condition (11A), appropriateness suppresses the magnification of the 3rd lens combination, suppresses the aberration that produces in the 3rd lens combination.
More preferably satisfy following condition.
0.23＜f 3/f t＜0.60(11A’)
Further preferably satisfy following condition.
0.30＜f 3/f t＜0.40(11A”)
Can further obtain above-mentioned effect by these conditions.
About the magnification of the 4th lens combination,, preferably satisfy following condition (12A) according to guaranteeing disposition far away and the viewpoint of proofreading and correct curvature of the image.
0.24＜f 4/f t＜0.80(12A)，
F wherein 4Be the focal length of above-mentioned the 4th lens combination, f tIt is the system-wide focal length of above-mentioned zoom lens of telescope end.
By making f 4/ f tThe upper limit that is not higher than condition (12A) is guaranteed the magnification of the 4th lens combination, thereby can guarantee the disposition far away of picture side, and suppresses the excessive correction of curvature of the image.
By making f 4/ f tBe not less than the lower limit of condition (12A), suitably suppress the magnification of the 4th lens combination, thereby can suppress the undercorrection of curvature of the image.
More preferably satisfy following condition.
0.36＜f 4/f t＜0.70(12A’)
Further preferably satisfy following condition.
0.48＜f 4/f t＜0.62(12A”)
The 4th lens combination also can be formed by plastic material.Mainly acting as of the 4th lens combination comes up ejaculation pupil position configuration to launch light into efficiently in ccd image sensor (CCD image sensor) or the CMOS types of image sensor electro-photographic elements such as (CMOS type imagesensor) in position.In order to bring into play this effect, need not very big magnification, as long as magnification is set in the scope of above-mentioned condition (12A), just can use the material of the such low-refraction of plastics.
By in the 4th lens combination, using plastic lens to suppress lowlyer, can provide more cheap zoom lens cost.
And in order to realize high magnification change ratioization keeping under the state of performance, more effective way is to make each lens combination bear the change overriding efficiently, and in whole change multiplying power zone aberration correction well.
For this reason, preferably from wide-angle side change multiplying power during, so that the interval between the 1st lens combination and the 2nd lens combination becomes is big, the interval between the 2nd lens combination and the 3rd lens combination diminishes, the big mode of interval change between the 3rd lens combination and the 4th lens combination moves the 1st lens combination, the 2nd lens combination, the 3rd lens combination and the 4th lens combination to telescope end.In addition, further preferred zoom lens has the brightness aperture, this brightness aperture is the brightness aperture that moves along optical axis direction with the 3rd lens combination during multiplying power in change, the brightness aperture slot moves when the 3rd lens combination is mobile for zoom, and the brightness aperture slot stopped when the 3rd lens combination stopped.
By each lens combination is moved, thereby can apply the effect of change multiplying power effectively, even under the situation of high magnification change ratioization, also help realizing high-performance to each lens combination.
And by the brightness aperture is moved with the 3rd lens combination, not only can effectively proofread and correct multiplying power chromatic aberation and distorton aberration, have effect at aspect of performance, but also can suitably control the entrance pupil position and penetrate the pupil position.
That is, can obtain the balance of light height of the axle outer light beam of the axle light height of outer light beam of wide-angle side and telescope end, can make the external diameter of the external diameter of the 1st lens combination and the 4th lens combination have good balance and constitute compactly.Particularly the densification that reduces for the size of lens on thickness direction of the external diameter of the 1st lens combination of wide-angle side also is resultful.And may be controlled to the change of the ejaculation pupil position when reducing to change multiplying power, therefore, the incident angle that incides the light in the imaging apparatus (for example ccd image sensor or CMOS types of image sensor etc.) can be remained in the suitable scope, can prevent to produce the shade of brightness, so be applicable to electronic image pickup device in the corner of image planes portion.
And then, for the total length that shortens zoom lens, make aberration balancing etc. good, preferred more close object side when the 1st lens combination being moved to compare at telescope end with in wide-angle side the time.At this moment, the 1st lens combination was only moved to object side, also can make the 1st lens combination along protruding track to the picture side shifting.
Also can make the 2nd lens combination only to the picture side shifting, can also be along protruding track to the picture side shifting.
The 3rd lens combination is only moved to object side.
Can make the 4th lens combination only to the picture side shifting, also can be only to the picture side shifting.Perhaps also can be along protruding track to object side or to the picture side shifting.
Brightness aperture and shutter unit are configured between the 2nd lens combination and the 3rd lens combination, move integratedly with the 3rd lens combination during multiplying power in change, concern with the position of the 3rd lens combination and do not move with not changing.
Entrance pupil is positioned at from object side observes on the nearer position (more shallow position), be easy to make and penetrate pupil away from image planes.And owing to be the lower position of height of off-axis ray between the 2nd lens combination and the 3rd lens combination, so as long as shutter unit is not large-scale, the no sensillary area when reducing brightness aperture and shutter unit are moved (dead space) gets final product.
And in the above-mentioned zoom lens, preferably constitute zoom lens lens combination add up to 4, promptly constitute 4 groups of zoom lens.
The quantity of lens combination is suppressed at 4 densifications that help when flexible.
And preferred above-mentioned zoom lens satisfies following condition (13A).
3.8＜f t/f w＜10.0(13A)，
F wherein wBe the focal length of the zoom lens of wide-angle side, f tIt is the focal length of the zoom lens of telescope end.
By making f t/ f wBe not higher than the upper limit of condition (13A), thereby be easy to suppress the amount of movement of lens combination, suppress total length easily.
By making f t/ f wBe not less than the lower limit of condition (13A), both can have brought into play the top illustrated zoom lens size and the advantage of cost aspect, can guarantee enough multiplying power change ratios again, can make the photography after field angle changes.
More preferably satisfy following condition.
4.3＜f t/f w＜7.0(13A’)
Further preferably satisfy following condition.
4.7＜f t/f w＜5.0(13A”)
Can further obtain above-mentioned effect by these conditions.
Then, in the zoom lens of a second aspect of the present invention, this zoom lens has the 1st lens combination of positive light coke in order from object side, the 2nd lens combination of negative power, the 3rd lens combination of positive light coke and the 4th lens combination with focal power, changing multiplying power in telescope end from wide-angle side, the interval of above-mentioned the 1st lens combination and above-mentioned the 2nd lens combination, the interval of above-mentioned the 2nd lens combination and above-mentioned the 3rd lens combination, the interval of above-mentioned the 3rd lens combination and above-mentioned the 4th lens combination changes, above-mentioned the 1st lens combination comprises positive lens and these 2 lens of negative lens, lens in above-mentioned the 1st lens combination add up to 2, above-mentioned the 2nd lens combination comprises negative lens in order from object side, these 2 lens of positive lens, lens in above-mentioned the 2nd lens combination add up to 2, and meet the following conditions:
1.78＜n d2n＜2.10(1B)
35.0＜v d2n＜50.0(2B)
Wherein, n D2nBe that negative lens in the 2nd lens combination is for refractive index, the v of d line D2nIt is the Abbe number of the negative lens in the 2nd lens combination.
As mentioned above, thisly have the 1st lens combination of positive light coke, the 2nd lens combination of negative power, the 3rd lens combination of positive light coke and the 4th lens combination of positive light coke in order if adopt from object side, structure by the multiplying power change is carried out at the interval that changes each group then can make each lens combination share the burden of multiplying power change function efficiently.Aberration change when this will help multiplying power changed suppresses lessly, prevents that the amount of movement of each lens combination from becoming excessive, carries out the densification of zoom lens.
And constituted the 1st lens combination by positive lens and these 2 lens of negative lens, constituted the 2nd lens combination by negative lens, these 2 lens of positive lens in order from object side.Thus, the size of lens combination on thickness direction can be reduced, and the size on the external diameter direction can also be reduced.
Because the height of incidence (from the height of optical axis) of off-axis ray uprises easily in the 1st lens combination, the 2nd lens combination, so if the edge thickness of desiring to guarantee lens for necessary thickness, then can produce the tendency that a last thickness is easy to thickening.And many if the lens number of the 1st lens combination, the 2nd lens combination becomes, then the off-axis ray height by these lens combination can uprise all the more, is used to guarantee that the last thickness of axle of edge thickness need have bigger thickness.Certainly corresponding to the recruitment of the lens number of the 1st lens combination, the 2nd lens combination, thickness is also can the phase strain big on the axle.
According to this viewpoint, by constituting the 1st lens combination, the 2nd lens combination with 2 less like this lens, thereby help reducing these lens combination diametrically size and the thickness on the optical axis, the densification of the lens barrel when helping flexible state.
If constitute the 1st lens combination by 1 positive lens and 1 negative lens, then help coming the correcting colour aberration with less lens numbers.Its result guarantees multiplying power change ratio even increase the interval variation of the 1st lens combination and the 2nd lens combination, also is easy to suppress the deterioration of chromatic aberation.
And king-sized the 2nd lens combination of thickness direction that in the past constituted lens combination by negative lens, these 2 lens of positive lens in order from object side.Because being the burden of multiplying power change function, the 2nd lens combination becomes big lens combination easily, so have bigger negative magnification mostly.
If only constitute the 2nd lens combination by negative lens, these 2 lens of positive lens, then the negative lens of the 2nd lens combination is 1, bears the function of bigger negative magnification.On the other hand, in order to guarantee high optical property in whole multiplying power change zone, effectively way is to suppress the generation of the aberration in this lens combination lessly as far as possible.For this reason, for the aberration that will produce in this negative lens suppresses lessly, need the negative lens of the 2nd lens combination satisfy condition (1B), (2B).These conditions have been stipulated refractive index and the Abbe number of the negative lens of the 2nd lens combination for the d line.
Condition (1B) is the EQUILIBRIUM CONDITION about cost and aberration correction function.By making n D2nBe not higher than the upper limit of condition (1B), thereby be easy to suppress the cost and the manufacturing cost of employed material.If n D2nThe upper limit that is higher than condition (1B), then employed material can be very expensive, becomes unmanageable material.
By making n D2nBe not less than the lower limit of condition (1B), thereby also be easy to guarantee the focal power born even the curvature of lens face diminishes.The barrel-shaped distorton aberration that its result can suppress wide-angle side becomes excessive, can also reduce the coma aberration of negative lens self etc.And the aberration change when being easy to suppress the generation of coma aberration etc. of wide-angle side and telescope end and multiplying power change.
Condition (2B) is the condition of proofreading and correct about the outer multiplying power chromatic aberation of chromatic aberation correction, particularly axle.Preferably by making v D2nBe not higher than the upper limit of condition (2B), thereby guarantee the refractive index of employed material, be easy to carry out aberration correction.
If be higher than the upper limit of conditional (2),, utilize existing lens material that refractive index is reduced though on chromatic aberation is proofreaied and correct, be favourable.
Preferably make v D2nBe not less than the lower limit of condition (2B), thereby can reduce color dispersion, be easy to suppress chromatic aberation.
More preferably satisfy following condition.
1.79＜n d2n＜2.00(1B’)
37.0＜v d2n＜45.0(2B’)
Further preferably satisfy following condition.
1.80＜n d2n＜1.95(1B”)
40.0＜v d2n＜47.0(2B”)
Can further obtain above-mentioned effect by these conditions.And these conditionals also can only determine the higher limit of the conditional that further limits, or only determine lower limit.Below illustrated each value conditions formula also identical.
In above-mentioned zoom lens, in the 1st lens combination, the 2nd lens combination, dispose negative lens respectively, thereby be easy to suppress the generation of the spherical aberration etc. in the synthesis system of the 1st, the 2nd lens combination of wide-angle side.Even under the 2nd lens combination is left the state of the 1st lens combination, also can suppress the spherical aberration in the 1st lens combination, so be easy to guarantee the 1st lens combination, the 2nd lens combination magnification separately.Even and, so help high magnification change ratioization because the interval variation that has increased between the 1st lens combination, the 2nd lens combination also is easy to suppress the change of spherical aberration.
The focal length of the negative lens of the focal length of the negative lens of preferred the 1st lens combination and the 2nd lens combination satisfies following condition (A), (B), (C).
0.6＜|f 1n|/f t＜5.0(A)
0.08＜|f 2n|/f t＜0.35(B)
5.0＜|f 1n|/|f 2n|＜25.0(C)
Wherein, f 1nBe the focal length of the negative lens in the 1st lens combination, f 2nBe the focal length of the negative lens in the 2nd lens combination, f tIt is the focal length of the zoom lens of telescope end.
These conditions (A), (B), (C) are the magnifications for the negative lens in negative lens in the 1st lens combination and the 2nd lens combination, are used for guaranteeing in the balance of getting appropriateness the condition of the effect of the aberration correction under the negative magnification.
By making | f 1n|/f tBe not higher than the upper limit of condition (A), thereby help proofreading and correct multiplying power chromatic aberation and spherical aberration in the 1st lens combination.
By making | f 1n/ f tBe not less than the lower limit of condition (A), thereby be easy to guarantee the magnification of the 1st lens combination, be easy to guarantee the multiplying power change function in the 2nd lens combination.
By making | f 2n|/f tBe not higher than the upper limit of condition (B), thereby be easy to guarantee the negative magnification of the 2nd lens combination, help miniaturization, high magnification change ratioization.
By making | f 2n|/f tBe not less than the lower limit of condition (B), be easy to suppress the generation of each aberration in the 2nd lens combination.
By making | f 1n|/| f 2n| be not higher than the upper limit of condition (C), thus the chromatic aberation when being easy to suppress the multiplying power change and the change of spherical aberration.
By making | f 1n|/| f 2n| be not less than the lower limit of condition (C), thereby be easy to reduce variable quantity with respect to the variable interval of multiplying power change amount.
When satisfying these conditions (A), (B), (C) simultaneously, help carrying out aberration correction, miniaturization, high magnification change ratioization.
More preferably each conditional is following condition.
0.8＜|f 1n|/f t＜4.0(A’)
0.10＜|f 2n|/f t＜0.30(B’)
6.0＜|f 1n|/|f 2n|＜21.0(C’)
Further preferably satisfy following condition.
1.0＜|f 1n|/f t＜3.0(A”)
0.12＜|f 2n|/f t＜0.25(B”)
7.0＜|f 1n|/|f 2n|＜18.0(C”)
Can further obtain above-mentioned effect thus.
And 2 lens of preferred the 1st lens combination satisfy following condition.
1.4＜|f 1n|/f 1p＜4.5(D)
F wherein 1pBe the focal length of the positive lens in the 1st lens combination, f 1nIt is the focal length of the negative lens in the 1st lens combination.
By making | f 1n|/f 1pThe upper limit that is not higher than condition (D) is guaranteed the magnification of negative lens, thereby helps proofreading and correct chromatic aberation that produces in positive lens etc.
By making | f 1n|/f 1pBe not less than the lower limit of condition (D), thereby the magnification that can suppress negative lens became strong, be easy to guarantee the positive amplification ratio of the 1st lens combination that constitutes by 2 lens.And be easy to suppress the off-centre relatively of two lens to the influence of aberration.
More preferably each conditional is following condition.
1.6＜|f 1n|/f 1p＜4.0(D’)
Further preferably satisfy following condition.
1.8＜|f 1n|/f 1p＜3.5(D”)
Can further obtain above-mentioned effect thus.
In order not only to realize densification but also obtain efficient and good optical performance, except above-mentioned measure, more preferably also taken measures in other aspects.Describe in detail below.
In order more effectively to proofread and correct the aberration in the 2nd lens combination, preferably making the positive lens of the 2nd lens combination is protruding meniscus shape at object side, suppresses the incident angle of axle outer light beam.At this moment, the shape of the positive lens of preferred the 2nd lens combination satisfies following condition (3A).
-5.0＜SF 2p＜-1.0(3A)，
SF wherein 2pBy SF 2p=(R2 Pf+ R2 Pr)/(R2 Pf-R2 Pr) define R2 PfBe the paraxial radius-of-curvature of the object side of the above-mentioned positive lens in above-mentioned the 2nd lens combination, R2 PrIt is the paraxial radius-of-curvature of the picture side of the above-mentioned positive lens in above-mentioned the 2nd lens combination.
Do not make SF 2pThe upper limit that is higher than condition (3A) is guaranteed the curvature of the object side of these lens, thereby helps the astigmatism of wide-angle side and the spherical aberration correction of telescope end.
Do not make SF 2pBe lower than the lower limit of condition (3A), the curvature that suppresses lens face becomes excessive, thereby is easy to suppress the generation of the outer high order aberration of axle.Particularly, help the outer curvature of the image of axle and the reduction of multiplying power chromatic aberation.
More preferably satisfy following condition.
-3.8＜SF 2p＜-1.4(3A’)
Further preferably satisfy following condition.
-2.6＜SF 2p＜-1.8(3A”)
Can further obtain above-mentioned effect by these conditions.
The magnification of preferred the 2nd lens combination satisfies following condition (4A).
0.12＜|f 2/f t|＜0.60(4A)，
Wherein, f 2Be the focal length of above-mentioned the 2nd lens combination, f tIt is the system-wide focal length of above-mentioned zoom lens of telescope end.
By making | f 2/ f t| be not higher than the upper limit of condition (4A), thereby can guarantee the magnification of the 2nd lens combination, be easy to obtain multiplying power change ratio, help the densification of lens barrel with respect to the interval variation amount of the 1st, the 2nd lens combination.
And preferably by making | f 2/ f t| be not less than the lower limit of condition (4A), thereby the magnification that suppresses the 2nd lens combination suppresses aberration.
More preferably satisfy following condition.
0.18＜|f 2/f t|＜0.49(4A’)
Further preferably satisfy following condition.
0.24＜|f 2/f t|＜0.38(4A”)
Can further obtain above-mentioned effect by these conditions.
Even and in order under the situation that constitutes the 2nd lens combination with 2 lens, also can fully to carry out aberration correction, the positive lens of preferred the 2nd lens combination satisfy condition (1A), (2A).
1.88＜n d2p＜2.20(1A)
13.0＜v d2p＜30.0(2A)
Wherein, n D2pBe that positive lens in the 2nd lens combination is for refractive index, the v of d line D2pIt is the Abbe number of the positive lens in the 2nd lens combination.
Condition (1A), (2A) are for the refractive index of d line and the condition of Abbe number about the positive lens in the 2nd lens combination.
Because being multiplying power change burden, the 2nd lens combination becomes big lens combination easily, so have bigger negative magnification mostly.Therefore, in order to proofread and correct the aberration that produces by 1 positive lens in the negative lens of the 2nd lens combination, it is effective adopting the refractive index of suitably setting these lens, the method for chromatic dispersion.
Condition (1A) is about the correction of curvature of the image and coma aberration and the condition of cost.By making n D2pBe not higher than the upper limit of condition (1A), thereby be easy to suppress the cost and the manufacturing cost of employed material.If n D2pThe upper limit that is higher than condition (1A), then employed material can be very expensive, becomes unmanageable material.
By making n D2pBe not less than the lower limit of condition (1A), thereby also be easy to guarantee focal power even the curvature of lens face diminishes.Its result can suppress wide-angle side curvature of the image, can also reduce the coma aberration of positive lens self etc., the aberration change when being easy to suppress the generation of coma aberration etc. of wide-angle side and telescope end and multiplying power change.
Condition (2A) is the condition of proofreading and correct about the outer multiplying power chromatic aberation of chromatic aberation correction, particularly axle.For in this lens combination, carrying out good correction, preferably make positive lens have the chromatic dispersion of appropriateness by the chromatic aberation that negative lens produced of the 2nd lens combination.
By making v D2pThe higher limit that is not higher than condition (2A), thus can guarantee the chromatic dispersion of positive lens, offset with the chromatic aberation that in the negative lens of the 2nd lens combination, produces, help reducing the at random of captured color of image.
By making v D2pCan not be lower than the lower limit of condition (2A), thereby the chromatic dispersion that can suppress in the short wavelength zone is excessive, helps reducing the at random of 2 colors under the frequency spectrum.
About each condition, more preferably satisfy following condition.
1.90＜n d2p＜2.16(1A’)
15.0＜v d2p＜25.0(2A’)
Be more preferably and satisfy following condition.
1.92＜n d2p＜2.11(1A”)
17.0＜v d2p＜21.0(2A”)
Can further obtain above-mentioned effect by these conditions.
In above-mentioned zoom lens, only with negative lens, when these 2 lens of positive lens constitute the 2nd lens combination, the function of the negative magnification that the negative lens of the 2nd lens combination burden is bigger.In order in whole multiplying power change zone, to guarantee high optical property, preferably suppress the aberration that produces in this negative lens less as far as possible.
For this reason, preferably these lens have big magnification as biconcave lens.And preferably become the shape that satisfies following condition (7A).
0.35＜SF 2n＜1.00(7A)，
SF wherein 2nBy SF 2n=(R 2nf+ R 2nr)/(R 2nf-R 2nr) define R 2nfBe the paraxial radius-of-curvature of the object side of the above-mentioned negative lens in the 2nd lens combination, R 2nrIt is the paraxial radius-of-curvature of the picture side of the above-mentioned negative lens in the 2nd lens combination.
By making SF 2nThe upper limit that is not higher than condition (7A) suppresses the curvature of the picture side of negative lens, thereby is easy to suppress the generation of the curvature of the image at wide-angle side place.And the axle that is easy to suppress the 2nd lens combination is gone up thickness.And be easy to suppress the last thickness of axle of the 2nd lens combination and guarantee image quality.
By making SF 2nBe not less than the lower limit of condition (7A), suppress the negative curvature of the object side of negative lens, thereby be easy to suppress outer each aberration of axle at wide-angle side place.
More preferably satisfy following condition.
0.45＜SF 2n＜0.85(7A’)
Further preferably satisfy following condition.
0.55＜SF 2n＜0.70(7A”)
Can further obtain above-mentioned effect by these conditions.
And obtain the good optical performance for the generation that suppresses aberration, preferably at least 1 lens face of the negative lens of the 2nd lens combination, dispose aspheric surface.But also can with the object side of this negative lens be made as aspheric surface as the two sides, side.
In these cases, (8A) more preferably meets the following conditions.
0.030＜(|ASP 2nf|+|ASP 2nr|)/f w＜0.320(8A)，
Wherein, ASP 2nfBe the aspheric surface side-play amount (aspherical displacement) on the lens face of object side of the above-mentioned negative lens in above-mentioned the 2nd lens combination, ASP 2nrBe the aspheric surface side-play amount on the lens face of picture side of the above-mentioned negative lens in above-mentioned the 2nd lens combination, f wIt is the focal length of the above-mentioned zoom lens at wide-angle side place.
The aspheric surface side-play amount is to be injected into when wide-angle side on the position of maximum height of incidence of light of this lens face, along the distance that the orientation measurement that is parallel to optical axis arrives from the benchmark sphere to this lens face, and will be towards situation about measuring as plus sign as side.Herein, the benchmark sphere be have the radius-of-curvature identical with the paraxial radius-of-curvature of this lens face, (vertex) contacts with this lens face on the summit sphere.Aspheric surface side-play amount when lens face is sphere or plane is 0.
By make (| ASP 2nf|+| ASP 2nr|)/f wThe upper limit that is not higher than condition (8A) makes the absolute value sum of aspheric surface side-play amount not excessive, thereby is easy to suppress because foozle and the deterioration that produces the optical property when eccentric between the face of non-spherical lens.
Preferably by make (| ASP 2nf|+| ASP 2nr|)/f wBe not less than the lower limit of condition (8A), guarantee the absolute value sum of aspheric surface side-play amount, guarantee the effect of the aberration correction that aspheric surface causes.
More preferably satisfy following condition.
0.040＜(|ASP 2nf|+|ASP 2nr|)/f w＜0.250(8A’)
Further preferably satisfy following condition.
0.050＜(|ASP 2nf|+|ASP 2nr|)/f w＜0.180(8A”)
Can further obtain above-mentioned effect by these conditions.
And the 2nd the aspheric surface of negative lens in the lens combination be preferably more away from the optical axis big more aspheric surface of focal power then.Herein, so-called focal power change means that greatly negative focal power diminishes or positive focal power becomes big.Be easy to suppress the distorton aberration and the coma aberration at wide-angle side place thus.
And then preferably to make the negative lens in the 2nd lens combination be biconcave lens, the object side of this biconcave lens, all is more away from the optical axis big more aspheric surface of focal power then as the side.
This had not only helped realizing that the axle of the 2nd lens combination was gone up or the miniaturization of the thickness of peripheral part but also help realizing the reduction of each aberration in the 2nd lens combination.
Preferably constitute the 1st lens combination by negative lens and these 2 lens of positive lens in order from object side.By adopting such lens configuration, thereby both can have the chromatic aberation calibration function, be easy to suppress the change of each aberration that the multiplying power change causes again.
The negative lens of the 1st lens combination and positive lens are engaged with each other.If for engaging lens, then can be by high magnification change ratioization, spool upward chromatic aberation that effectively focal length of telescope end is become easily problem when elongated is proofreaied and correct.That can also suppress that assembly error causes results from the lens deterioration of eccentric optical property relatively, the raising of yield rate and cost is reduced contributing.
The negative lens of the 1st lens combination and positive lens also can be the simple lenses independent of each other that does not engage.Like this, the plane of refraction of the 1st lens combination has 4 faces, has improved the degree of freedom of design, so can more effectively proofread and correct the coma aberration of the distorton aberration and the telescope end of wide-angle side.
And following condition (9A) is preferably satisfied at the negative lens of above-mentioned the 1st lens combination and the interval of positive lens.
0.0≤L 1np/L 1＜0.2(9A)，
Wherein, L 1npBe that the above-mentioned negative lens of the 1st lens combination and the axle of above-mentioned positive lens are gone up at interval L 1The axle that is above-mentioned the 1st lens combination is gone up gross thickness.
By making L 1np/ L 1The upper limit that is not higher than condition (9A), thus can suppress to reduce the effective diameter of these lens, even help zoom lens integral body densification diametrically by the off-axis ray height of the lens of close object side.And L in the reality 1np/ L 1Can not be lower than the lower limit of condition (9A).
More preferably satisfy following condition.
0.0≤L 1np/L 1＜0.15(9A’)
Further preferably satisfy following condition.
0.0≤L 1np/L 1＜0.10(9A”)
Can further obtain above-mentioned effect by these conditions.
In order to realize the slimming of lens barrel, preferably constitute the 3rd lens combination with the lens below 3.
When hope makes the zoom lens miniaturization, preferably constitute the 3rd lens combination by positive lens, these 2 lens of negative lens in order from object side.
By constituting, can realize the slimming of lens barrel by the minimum lens number that is used for proofreading and correct each aberration such as chromatic aberation that the 3rd lens combination produces.And by such configuration lens, thereby the front side principal point is positioned near on the position of object, be easy to guarantee the multiplying power change than and suppress the amount of movement of lens combination less, this point also helps densification.
Guarantee in hope under the situation of higher optical property, also can constitute the 3rd lens combination by these 3 lens of positive lens, positive lens and negative lens in order from object side.
By adopting the structure of such lens configuration, can mainly share the positive amplification ratio of the 3rd lens combination by 2 positive lenss, help the correction of spherical aberration and coma aberration.
And the negative lens of preferred the 3rd lens combination engages with the positive lens of adjacent object side.By joint positive lens and negative lens, thereby can more effectively carry out the correction of a last chromatic aberation.And owing to can prevent the deterioration of the lens eccentric relatively optical property that causes each other in the assembling procedure, thereby realize that the raising of yield rate and cost reduce.
The aspheric surface of configuration more than 1 has effect to correcting spherical aberration and coma aberration in the 3rd lens combination.More preferably the positive lens of close object side of the 3rd lens combination is a double-sized non-spherical.
If in a plurality of lens, dispose aspheric surface then easy the change greatly of the eccentric relatively optical property deterioration that causes of lens, but by two sides that make 1 lens like this is aspheric surface, then the eccentric relatively optical property that causes of lens can be worsened and suppress lessly, and correcting spherical aberration and coma aberration better.
Constituting with lens under the situation of the 3rd lens combination especially, by the degree of freedom that aspheric surface can improve design is set, this is not only realizing miniaturization but also guarantee that aspect the optical property two be preferred.
And according to the viewpoint of the balance of densification and optical property, preferred the 1st lens combination satisfies following condition (10A).
0.50＜f 1/f t＜2.00(10A)，
F wherein 1Be the focal length of above-mentioned the 1st lens combination, f tIt is the focal length of the above-mentioned zoom lens of telescope end.
By making f 1/ f tThe upper limit that is not higher than condition (10A) is guaranteed the magnification of the 1st lens combination, thereby is easy to suppress the total length of zoom lens, helps the miniaturization of lens barrel.
By making f 1/ f tBe not less than the lower limit of condition (10A), thereby can suppress the magnification of the 1st lens combination, can suppress the generation of the spherical aberration and the coma aberration of telescope end, be easy to guarantee the good optical performance.
More preferably satisfy following condition.
0.75＜f 1/f t＜1.80(10A’)
Further preferably satisfy following condition.
0.95＜f 1/f t＜1.60(10A”)
Can further obtain above-mentioned effect by these conditions.
The magnification of preferred the 3rd lens combination satisfies following condition (11A).
0.16＜f 3/f t＜0.80(11A)，
F wherein 3Be the focal length of above-mentioned the 3rd lens combination, f tIt is the focal length of the above-mentioned zoom lens of telescope end.
Make f 3/ f tThe upper limit that is not higher than condition (11A) is guaranteed the magnification of the 3rd lens combination, guarantees the change multiplying power burden in the 3rd lens combination, and these are preferred from the miniaturization viewpoint.
Preferably make f 3/ f tBe not less than the lower limit of condition (11A), appropriateness suppresses the magnification of the 3rd lens combination, suppresses the aberration that produces in the 3rd lens combination.
More preferably satisfy following condition.
0.23＜f 3/f t＜0.60(11A’)
Further preferably satisfy following condition.
0.30＜f 3/f t＜0.40(11A”)
Can further obtain above-mentioned effect by these conditions.
About the magnification of the 4th lens combination,, preferably satisfy following condition (12A) according to guaranteeing disposition far away and the viewpoint of proofreading and correct curvature of the image.
0.24＜f 4/f t＜0.80(12A)，
F wherein 4Be the focal length of above-mentioned the 4th lens combination, f tIt is the system-wide focal length of above-mentioned zoom lens of telescope end.
By making f 4/ f tThe upper limit that is not higher than condition (12A) is guaranteed the magnification of the 4th lens combination, thereby can guarantee the disposition far away of picture side, and suppresses the excessive correction of curvature of the image.
By making f 4/ f tBe not less than the lower limit of condition (12A), appropriateness suppresses the magnification of the 4th lens combination, thereby can suppress the undercorrection of curvature of the image.
More preferably satisfy following condition.
0.36＜f 4/f t＜0.70(12A’)
Further preferably satisfy following condition.
0.48＜f 4/f t＜0.62(12A”)
The 4th lens combination also can be formed by plastic material.Mainly acting as of the 4th lens combination comes up ejaculation pupil position configuration to launch light into efficiently in ccd image sensor (CCD image sensor) or the CMOS types of image sensor electro-photographic elements such as (CMOS type imagesensor) in position.In order to bring into play this effect, need not very big magnification, as long as magnification is set in the scope of above-mentioned condition (12A), just can use the material of the such low-refraction of plastics.
By in the 4th lens combination, using plastic lens to suppress lowlyer, can provide more cheap zoom lens cost.
And in order to realize high magnification change ratioization keeping under the state of performance, more effective way is to make each lens combination bear the change overriding efficiently, and in whole change multiplying power zone aberration correction well.
For this reason, preferably from wide-angle side change multiplying power during, so that the interval between the 1st lens combination and the 2nd lens combination becomes is big, the interval between the 2nd lens combination and the 3rd lens combination diminishes, the big mode of interval change between the 3rd lens combination and the 4th lens combination moves the 1st lens combination, the 2nd lens combination, the 3rd lens combination and the 4th lens combination to telescope end.In addition, further preferred zoom lens has the brightness aperture that moves along optical axis direction with the 3rd lens combination when the change multiplying power.
By each lens combination is moved, thereby can apply the effect of change multiplying power effectively, even under the situation of high magnification change ratioization, also help realizing high-performance to each lens combination.
And by the brightness aperture is moved with the 3rd lens combination, not only can effectively proofread and correct multiplying power chromatic aberation and distorton aberration, have effect at aspect of performance, but also can suitably control the entrance pupil position and penetrate the pupil position.
That is, can obtain the balance of light height of the axle outer light beam of the axle light height of outer light beam of wide-angle side and telescope end, can make the external diameter of the external diameter of the 1st lens combination and the 4th lens combination have good balance and constitute compactly.Particularly the densification that reduces for the size of lens on thickness direction of the external diameter of the 1st lens combination of wide-angle side also is resultful.And may be controlled to the change of the ejaculation pupil position when reducing to change multiplying power, therefore, the incident angle that incides the light in the imaging apparatus (for example ccd image sensor or CMOS types of image sensor etc.) can be remained in the suitable scope, can prevent to produce the shade of brightness, so be applicable to electronic image pickup device in the corner of image planes portion.
And then, for the total length that shortens zoom lens, make aberration balancing etc. good, preferred more close object side when the 1st lens combination being moved to compare at telescope end with in wide-angle side the time.At this moment, the 1st lens combination was only moved to object side, also can make the 1st lens combination along protruding track to the picture side shifting.
Also can make the 2nd lens combination only to the picture side shifting, can also be along protruding track to the picture side shifting.
The 3rd lens combination is only moved to object side.
The 4th lens combination is only moved to object side, also can be only to the picture side shifting.Perhaps also can be along protruding track to object side or to the picture side shifting.
Brightness aperture and shutter unit are configured between the 2nd lens combination and the 3rd lens combination, can move integratedly with the 3rd lens combination when the change multiplying power.
Entrance pupil is positioned at from object side observes on the nearer position (more shallow position), be easy to make and penetrate pupil away from image planes.And owing to be the lower position of height of off-axis ray between the 2nd lens combination and the 3rd lens combination, so as long as shutter unit is not large-scale, the no sensillary area when reducing brightness aperture and shutter unit are moved (dead space) gets final product.
And in the above-mentioned zoom lens, preferably constitute zoom lens lens combination add up to 4, promptly constitute 4 groups of zoom lens.
The quantity of lens combination is suppressed at 4 densifications that help when flexible.
And preferred above-mentioned zoom lens satisfies following condition (13A).
3.8＜f t/f w＜10.0(13A)，
F wherein wBe the focal length of the zoom lens of wide-angle side, f tIt is the focal length of the zoom lens of telescope end.
By making f t/ f wBe not higher than the upper limit of condition (13A), thereby be easy to suppress the amount of movement of lens combination, suppress total length easily.
By making f t/ f wBe not less than the lower limit of condition (13A), both can have brought into play the top illustrated zoom lens size and the advantage of cost aspect, can guarantee enough multiplying power change ratios again, can make the photography after field angle changes.
More preferably satisfy following condition.
4.3＜f t/f w＜7.0(13A’)
Further preferably satisfy following condition.
4.7＜f t/f w＜5.0(13A”)
Can further obtain above-mentioned effect by these conditions.
Zoom lens of the present invention is easy to guarantee disposition far away.Therefore be highly suitable for photographic lens as electronic image pickup device.
Camera head of the present invention preferably includes certain above-mentioned zoom lens and is configured on the picture side of this zoom lens, the formed optical image of this zoom lens is converted to the electro-photographic element of electric signal.
The digital embodiment of zoom lens of the present invention then is described.And the invention is not restricted to these digital embodiment.
Figure 1A～Fig. 9 C is the sectional view that comprises optical axis in infintie object point when focusing of embodiment 1～9.Wherein, Figure 1A, 2A, 3A ... be the sectional view of wide-angle side, Figure 1B, 2B, 3B ... be the sectional view of intermediateness, Fig. 1 C, 2C, 3C ... be the sectional view of telescope end.Among Figure 1A～Fig. 9 C, respectively the 1st lens combination is expressed as G1, with the 2nd lens combination be expressed as G2, with the brightness aperture be expressed as S, with the 3rd lens combination be expressed as G3, with the 4th lens combination be expressed as G4, the parallel flat that will constitute the low-pass filter of the wavelength region may restriction coating of having implemented the restriction infrared light is expressed as F, the parallel flat of the cloche of electro-photographic element is expressed as C, image planes are expressed as I.And can on the surface of cloche C, implement the multilayer film that wavelength region may limits usefulness.Can also make this cloche C have the effect of low-pass filter.
Embodiment 1 has the 1st lens combination G1, the 2nd lens combination G2, the brightness aperture S of negative power, the 3rd lens combination G3 of positive light coke, the 4th lens combination G4 of positive light coke of positive light coke in order from object side shown in Figure 1A to Fig. 1 C.
From wide-angle side change multiplying power during to telescope end, the 1st lens combination G1 moves to object side, and the 2nd lens combination G2 is to the picture side shifting, and the 3rd lens combination G3 moves to object side, and the 4th lens combination G4 is in case the moving direction and to looking like side shifting of reversing again to object side moves after.
The 1st lens combination G1 is made of the 1st diverging meniscus lens and the 2nd biconvex positive lens of convex surface towards object side in order from object side.The 2nd lens combination G2 is made of towards the 4th positive meniscus lens of object side the 3rd double-concave negative lens and convex surface in order from object side.The 3rd lens combination G3 is made of towards the 6th diverging meniscus lens of object side the 5th biconvex positive lens and convex surface in order from object side.The 4th lens combination G4 is made of the 7th biconvex positive lens.
Aspheric surface is used on these 5 faces of face of object side of the two sides of two sides, the 5th biconvex positive lens of the 3rd double-concave negative lens and the 7th biconvex positive lens.
Embodiment 2 has the 1st lens combination G1, the 2nd lens combination G2, the brightness aperture S of negative power, the 3rd lens combination G3 of positive light coke, the 4th lens combination G4 of positive light coke of positive light coke in order from object side shown in Fig. 2 A to Fig. 2 C.
When changing multiplying power to telescope end from wide-angle side, the 1st lens combination G1 moves to object side, the 2nd lens combination G2 moves to object side in case reverse moving direction again after as side shifting, the 3rd lens combination G3 moves to object side, and the 4th lens combination G4 is in case the moving direction and to looking like side shifting of reversing again to object side moves after.
The 1st lens combination G1 is made of the 1st diverging meniscus lens and the 2nd biconvex positive lens of convex surface towards object side in order from object side.The 1st diverging meniscus lens and the 2nd biconvex positive lens are bonded together.The 2nd lens combination G2 is made of towards the 4th positive meniscus lens of object side the 3rd double-concave negative lens and convex surface in order from object side.The 3rd lens combination G3 is made of the 5th biconvex positive lens, the 6th biconvex positive lens and the 7th double-concave negative lens in order from object side.The 6th biconvex positive lens and the 7th double-concave negative lens are joined together.The 4th lens combination G4 is made of the 8th biconvex positive lens.
Aspheric surface is used on these 5 faces of face of object side of the two sides of two sides, the 5th biconvex positive lens of the 3rd double-concave negative lens and the 8th biconvex positive lens.
Embodiment 3 has the 1st lens combination G1, the 2nd lens combination G2, the brightness aperture S of negative power, the 3rd lens combination G3 of positive light coke, the 4th lens combination G4 of positive light coke of positive light coke in order from object side shown in Fig. 3 A to Fig. 3 C.
When changing multiplying power to telescope end from wide-angle side, the 1st lens combination G1 moves to object side, and the 2nd lens combination G2 is to the picture side shifting, and the 3rd lens combination G3 moves to object side, and the 4th lens combination G4 moves to object side.
The 1st lens combination G1 is made of the 1st diverging meniscus lens and the 2nd biconvex positive lens of convex surface towards object side in order from object side.The 2nd lens combination G2 is made of towards the 4th positive meniscus lens of object side the 3rd double-concave negative lens and convex surface.The 3rd lens combination G3 is made of the 5th biconvex positive lens, the 6th biconvex positive lens and the 7th double-concave negative lens.The 6th biconvex positive lens and the 7th double-concave negative lens are bonded together.The 4th lens combination G4 is made of the 8th biconvex positive lens.
Aspheric surface is used on these 5 faces of face of object side of the two sides of two sides, the 5th biconvex positive lens of the 3rd double-concave negative lens and the 8th biconvex positive lens.
Embodiment 4 has the 1st lens combination G1, the 2nd lens combination G2, the brightness aperture S of negative power, the 3rd lens combination G3 of positive light coke, the 4th lens combination G4 of positive light coke of positive light coke in order from object side shown in Fig. 4 A to Fig. 4 C.
When changing multiplying power to telescope end from wide-angle side, the 1st lens combination G1 moves to object side, the 2nd lens combination G2 is in case move to object side to as side shifting after again, and the 3rd lens combination G3 moves to object side, the 4th lens combination G4 in case after object side moves again to looking like side shifting.
The 1st lens combination G1 is made of the 1st diverging meniscus lens and the 2nd biconvex positive lens of convex surface towards object side in order from object side.The 2nd lens combination G2 is made of towards the 4th positive meniscus lens of object side the 3rd double-concave negative lens and convex surface in order from object side.The 3rd lens combination G3 is made of the 5th biconvex positive lens, the 6th biconvex positive lens and the 7th double-concave negative lens in order from object side.The 6th biconvex positive lens and the 7th double-concave negative lens are bonded together.The 4th lens combination G4 is made of the 8th biconvex positive lens.
Aspheric surface is used on these 5 faces of face of object side of the two sides of two sides, the 5th biconvex positive lens of the 3rd double-concave negative lens and the 8th biconvex positive lens.
Embodiment 5 has the 1st lens combination G1, the 2nd lens combination G2, the brightness aperture S of negative power, the 3rd lens combination G3 of positive light coke, the 4th lens combination G4 of positive light coke of positive light coke in order from object side shown in Fig. 5 A to Fig. 5 C.
From wide-angle side change multiplying power during to telescope end, the 1st lens combination G1 moves to object side, and the 2nd lens combination G2 is to the picture side shifting, and the 3rd lens combination G3 moves to object side, the 4th lens combination G4 in case to object side moves after again to looking like side shifting.
The 1st lens combination G1 is made of the 1st diverging meniscus lens and the 2nd biconvex positive lens of convex surface towards object side in order from object side.The 2nd lens combination G2 is made of towards the 4th positive meniscus lens of object side the 3rd double-concave negative lens and convex surface in order from object side.The 3rd lens combination G3 is made of towards the 7th diverging meniscus lens of object side towards the 6th positive meniscus lens and the convex surface of object side the 5th biconvex positive lens, convex surface in order from object side.The 6th positive meniscus lens and the 7th diverging meniscus lens are bonded together.The 4th lens combination G4 is made of the 8th biconvex positive lens.
Aspheric surface is used on these 6 faces of face of object side of the two sides of two sides, the 5th biconvex positive lens of face, the 3rd double-concave negative lens of the picture side of the 2nd biconvex positive lens and the 8th biconvex positive lens.
Embodiment 6 has the 1st lens combination G1, the 2nd lens combination G2, the brightness aperture S of negative power, the 3rd lens combination G3 of positive light coke, the 4th lens combination G4 of positive light coke of positive light coke in order from object side shown in Fig. 6 A to Fig. 6 C.
From wide-angle side change multiplying power during to telescope end, the 1st lens combination G1 moves to object side, and the 2nd lens combination G2 is to the picture side shifting, and the 3rd lens combination G3 moves to object side, the 4th lens combination G4 in case to object side moves after again to looking like side shifting.
The 1st lens combination G1 is made of the 1st diverging meniscus lens and the 2nd biconvex positive lens of convex surface towards object side in order from object side.The 2nd lens combination G2 is made of towards the 4th positive meniscus lens of object side the 3rd double-concave negative lens and convex surface in order from object side.The 3rd lens combination G3 is made of towards the 7th diverging meniscus lens of object side towards the 6th positive meniscus lens and the convex surface of object side the 5th biconvex positive lens, convex surface in order from object side.The 6th positive meniscus lens and the 7th diverging meniscus lens are bonded together.The 4th lens combination G4 is made of the 8th biconvex positive lens.
Aspheric surface is used on these 6 faces of face of object side of the two sides of two sides, the 5th biconvex positive lens of face, the 3rd double-concave negative lens of the picture side of the 2nd biconvex positive lens and the 8th biconvex positive lens.
Embodiment 7 has the 1st lens combination G1, the 2nd lens combination G2, the brightness aperture S of negative power, the 3rd lens combination G3 of positive light coke, the 4th lens combination G4 of positive light coke of positive light coke in order from object side shown in Fig. 7 A to Fig. 7 C.
When changing multiplying power to telescope end from wide-angle side, the 1st lens combination G1 moves to object side, and the 2nd lens combination G2 is to the picture side shifting, and the 3rd lens combination G3 moves to object side, and the 4th lens combination G4 is in case move again to the picture side shifting to object side.
The 1st lens combination G1 is made of the 1st diverging meniscus lens and the 2nd biconvex positive lens of convex surface towards object side in order from object side.The 2nd lens combination G2 is made of towards the 4th positive meniscus lens of object side the 3rd double-concave negative lens and convex surface in order from object side.The 3rd lens combination G3 is made of towards the 7th diverging meniscus lens of object side towards the 6th positive meniscus lens and the convex surface of object side the 5th biconvex positive lens, convex surface in order from object side.The 6th positive meniscus lens and the 7th diverging meniscus lens are bonded together.The 4th lens combination G4 is made of the 8th biconvex positive lens.
Aspheric surface is used on these 6 faces of face of object side of the two sides of two sides, the 5th biconvex positive lens of picture side, the 3rd double-concave negative lens of the 2nd biconvex positive lens and the 8th biconvex positive lens.
Embodiment 8 has the 1st lens combination G1, the 2nd lens combination G2, the brightness aperture S of negative power, the 3rd lens combination G3 of positive light coke, the 4th lens combination G4 of positive light coke of positive light coke in order from object side shown in Fig. 8 A to Fig. 8 C.
From wide-angle side change multiplying power during to telescope end, the 1st lens combination G1 moves to object side, and the 2nd lens combination G2 is to the picture side shifting, and the 3rd lens combination G3 moves to object side, the 4th lens combination G4 in case to object side moves after again to looking like side shifting.
The 1st lens combination G1 is made of the 1st diverging meniscus lens and the 2nd biconvex positive lens of convex surface towards object side in order from object side.The 2nd lens combination G2 is made of towards the 4th positive meniscus lens of object side the 3rd double-concave negative lens and convex surface in order from object side.The 3rd lens combination G3 is made of towards the 7th diverging meniscus lens of object side towards the 6th positive meniscus lens and the convex surface of object side the 5th biconvex positive lens, convex surface in order from object side.The 6th positive meniscus lens and the 7th diverging meniscus lens are bonded together.The 4th lens combination G4 is made of the 8th biconvex positive lens.
Aspheric surface is used on these 6 faces of face of object side of the two sides of two sides, the 5th biconvex positive lens of face, the 3rd double-concave negative lens of the picture side of the 2nd biconvex positive lens and the 8th biconvex positive lens.
Embodiment 9 has the 1st lens combination G1, the 2nd lens combination G2, the brightness aperture S of negative power, the 3rd lens combination G3 of positive light coke, the 4th lens combination G4 of positive light coke of positive light coke in order from object side shown in Fig. 9 A to Fig. 9 C.
From wide-angle side change multiplying power during to telescope end, the 1st lens combination G1 moves to object side, and the 2nd lens combination G2 is to the picture side shifting, and the 3rd lens combination G3 moves to object side, the 4th lens combination G4 in case to object side moves after again to looking like side shifting.
The 1st lens combination G1 is made of the 1st diverging meniscus lens and the 2nd biconvex lens of convex surface towards object side in order from object side.The 2nd lens combination G2 is made of towards the 4th positive meniscus lens of object side the 3rd double-concave negative lens and convex surface in order from object side.The 3rd lens combination G3 is made of towards the 7th diverging meniscus lens of object side towards the 6th positive meniscus lens and the convex surface of object side the 5th biconvex positive lens, convex surface in order from object side.The 6th positive meniscus lens and the 7th diverging meniscus lens are bonded together.The 4th lens combination G4 is made of the 8th biconvex positive lens.
Aspheric surface is used on these 6 faces of face of object side of the two sides of two sides, the 5th biconvex positive lens of face, the 3rd double-concave negative lens of the picture side of the 2nd biconvex positive lens and the 8th biconvex positive lens.
The numeric data of representing the various embodiments described above below.Except above-mentioned mark, mark f is focal length, the F of zoom lens NOFor F number (Number), ω are that angle of half field-of view, WE are that wide-angle side, ST are that intermediateness, TE are telescope end, r 1, r 2... be paraxial radius-of-curvature, the d of each lens face 1, d 2... be interval, the n between each lens face D1, n D2... be refractive index, the vs of each lens for the d line D1, v D2... be the Abbe number of each lens.Mark (AS) after the radius-of-curvature represents that this face is that aspheric surface, (S) represent that this face is that opening aperture face, (I) represent that this face is image planes.And aspheric shape can be that x axle (direct of travel with light is a forward), optical axis and aspheric intersection point are initial point, are to represent by following formula in the coordinate system of y axle perpendicular to the direction of optical axis by initial point with the optical axis.
X＝(y 2/r)/[1+{1-(K+1)(y/r) 2} 1/2]+A 4y 4+A 6y 6+A 8y 8+A 10y 10+A 12y 12，
Wherein, r is that paraxial radius-of-curvature, K are circular cone coefficient, A 4, A 6, A 8, A 10, A 12Be respectively 4 times, 6 times, 8 times, 10 times, 12 times asphericity coefficient.In addition, in asphericity coefficient, " e-n " (n is an integer) expression multiply by " 10 -n".
Embodiment 1
r 1＝21.447 d 1＝0.80 n d1＝1.92286 v d1＝18.90
r 2＝16.568 d 2＝0.33
r 3＝19.065 d 3＝3.00 n d2＝1.72916 v d2＝54.68
r 4=-635.214 d 4=variable
r 5＝-27.371(AS) d 5＝1.00 n d3＝1.88300 v d3＝40.76
r 6＝5.547(AS) d 6＝1.71
r 7＝10.368 d 7＝2.16 n d4＝1.92286 v d4＝18.90
r 8=32.087 d 8=variable
r 9＝∞(S) d 9＝0.10
r 10＝4.015(AS) d 10＝2.14 n d5＝1.58313 v d5＝59.38
r 11＝-20.737(AS) d 11＝0.07
r 12＝6.067 d 12＝1.07 n d6＝1.92286 v d6＝20.88
r 13=3.042 d 13=variable
r 14＝13.673(AS) d 4＝2.68 n d7＝1.52542 v d7＝55.78
r 15=-65.892 d 15=variable
r 16＝∞ d 16＝0.50 n d8＝1.54771 v d8＝62.84
r 17＝∞ d 17＝0.50
r 18＝∞ d 18＝0.50 n d9＝1.51633 v d9＝64.14
r 19＝∞ d 19＝0.50
r 20＝∞(I)
Asphericity coefficient
The 5th
R＝-27.371
K＝0.065
A 4＝2.93685e-04 A 6＝-1.29521e-05 A 8＝2.63539e-07
A 10＝-7.77717e-10
The 6th
R＝5.547
K＝-0.216
A 4＝-2.74527e-04 A 6＝5.81879e-06 A 8＝-2.46028e-06
A 10＝7.68048e-08
The 10th
R＝4.015
K＝-0.052
A 4＝-1.29073e-03 A 6＝-6.12402e-06 A 8＝1.86699e-06
The 11st
R＝-20.737
K＝0.000
A 4＝7.99142e-04 A 6＝6.56260e-05 A 8＝4.48582e-06
The 14th
R＝13.673
K＝-0.880
A 4＝3.32538e-05 A 6＝3.03636e-05 A 8＝-2.12591e-06
A 10＝6.32654e-08
Zoom data (∞)
WE ST TE
f(mm) 6.60 14.49 31.76
F NO 4.47 5.71 5.99
2ω(°) 62.67 29.43 13.60
d 4 1.18 7.61 17.27
d 8 12.07 5.03 0.55
d 13 4.74 8.30 9.73
d 15 3.31 4.30 3.77
Embodiment 2
r 1＝22.824 d 1＝0.80 n d1＝1.84666 v d1＝23.78
r 2＝14.601 d 2＝2.82 n d2＝1.72916 v d2＝54.68
r 3=414.790 d 3=variable
r 4＝-19.623(AS) d 4＝0.90 n d3＝1.80495 v d3＝40.90
r 5＝5.406(AS) d 5＝1.71
r 6＝8.975 d 6＝2.07 n d4＝1.92286 v d4＝18.90
r 7=20.246 d 7=variable
r 8＝∞(S) d 8＝0.10
r 9＝5.364(AS) d 9＝2.57 n d5＝1.58313 v d5＝59.38
r 10＝-16.396(AS) d 10＝0.10
r 11＝8.877 d 11＝2.16 n d6＝1.72916 v d6＝54.68
r 12＝-5.099 d 12＝0.40 n d7＝1.80100 v d7＝34.97
r 13=4.240 d 13=variable
r 14＝11.188(AS) d 14＝2.14 n d8＝1.52542 v d8＝55.78
r 15=-171.452 d 15=variable
r 16＝∞ d 16＝0.50 n d9＝1.54771 v d9＝62.84
r 17＝∞ d 17＝0.50
r 18＝∞ d 18＝0.50 n d10＝1.51633 v d10＝64.14
r 19＝∞ d 19＝0.50
r 20＝∞(I)
Asphericity coefficient
The 4th
R＝-19.623
K＝0.089
A 4＝8.04207e-04 A 6＝-2.03534e-05 A 8＝2.82387e-07
A 10＝-1.69194e-09
The 5th
R＝5.406
K＝-0.329
A 4＝4.28184e-04 A 6＝2.10097e-05 A 8＝-1.65174e-06
A 10＝1.28854e-08
The 9th
R＝5.364
K＝-0.166
A 4＝-2.03573e-04 A 6＝4.18417e-05 A 8＝3.69979e-06
The 10th
R＝-16.396
K＝0.000
A 4＝9.35195e-04 A 6＝6.75272e-05 A 8＝5.30410e-06
The 14th
R＝11.188
K＝-1.490
A 4＝5.63156e-05 A 6＝1.24846e-05 A 8＝-1.04700e-06
A 10＝3.12395e-08
Zoom data (∞)
WE ST TE
f(mm) 6.61 14.38 31.74
F NO 3.60 4.46 6.02
2ω(°)?62.90 29.44 13.45
d 3 1.26 7.82 13.73
d 7 12.51 5.36 1.54
d 13 4.42 6.52 14.10
d 15 2.69 4.42 3.00
Embodiment 3
r 1＝23.457 d 1＝0.80 n d1＝1.84666 v d1＝23.78
r 2＝14.154 d 2＝0.40
r 3＝15.271 d 3＝3.00 n d2＝1.77250 v d2＝49.60
r 4=-215.758 d 4=variable
r 5＝-23.097(AS) d 5＝1.00 n d3＝1.80495 v d3＝40.90
r 6＝5.348(AS) d 6＝1.40
r 7＝8.580 d 7＝2.00 n d4＝1.92286 v d4＝18.90
r 8=18.871 d 8=variable
r 9＝∞(S) d 9＝0.10
r 10＝5.766(AS) d 10＝2.45 n d5＝1.58313 v d5＝59.38
r 11＝-10.882(AS) d 11＝0.10
r 12＝15.328 d 12＝1.44 n d6＝1.69680 v d6＝55.53
r 13＝-15.328 d 13＝1.22 n d7＝1.68893 v d7＝31.07
r 14=4.089 d 14=variable
r 15＝14.324(AS) d 15＝2.60 n d8＝1.52542 v d8＝55.78
r 16=-27.378 d 16=variable
r 17＝∞ d 17＝0.50 n d9＝1.54771 v d9＝62.84
r 18＝∞ d 18＝0.50
r 19＝∞ d 19＝0.50 n d10＝1.51633 v d10＝64.14
r 20＝∞ d 20＝0.45
r 21＝∞(I)
Asphericity coefficient
The 5th
R＝-23.097
K＝0.089
A 4＝1.80967e-04 A 6＝-1.62280e-07 A 8＝3.96691e-08
A 10＝-7.98836e-10
The 6th
R＝5.348
K＝-0.296
A 4＝-1.84110e-04 A 6＝1.36361e-07 A 8＝1.68053e-07
A 10＝-1.07186e-09
The 10th
R＝5.766
K＝-1.073
A 4＝-9.79726e-05
A 6＝1.50579e-06
The 11st
R＝-10.882
K＝7.693
A 4＝1.32858e-03 A 6＝3.01907e-05 A 8＝2.16650e-08
A 10＝6.54410e-11
The 15th
R＝14.324
K＝-0.001
A 4＝4.02883e-05 A 6＝5.91976e-06 A 8＝-1.61602e-07
A 10＝2.12392e-09
Zoom data (∞)
WE ST TE
f(mm) 6.62 14.37 32.09
F NO 3.83 5.11 6.00
2ω(°) 62.68 29.65 13.53
d 4 0.88 5.76 12.75
d 8 13.63 6.80 1.53
d 14 4.27 9.62 13.30
d 16 3.19 3.12 2.96
Embodiment 4
r 1＝18.613 d 1＝0.83 n d1＝2.00170 v d1＝20.64
r 2＝14.132 d 2＝0.32
r 3＝15.458 d 3＝3.00 n d2＝1.72916 v d2＝54.68
r 4=-7762.115 d 4=variable
r 5＝-19.900(AS) d 5＝1.00 n d3＝1.80495 v d3＝40.90
r 6＝4.735(AS) d 6＝1.32
r 7＝7.926 d 7＝2.25 n d4＝2.00170 v d4＝20.64
r 8=18.204 d 8=variable
r 9∞(S) d 9＝0.10
r 10＝5.243(AS) d 10＝2.14 n d5＝1.58313 v d5＝59.38
r 11＝-14.423(AS) d 11＝0.10
r 12＝13.297 d 12＝1.41 n d6＝1.69680 v d6＝55.53
r 13＝-13.297 d 13＝0.84 n d7＝1.68893 v d7＝31.07
r 14=4.302 d 14=variable
r 15＝12.620(AS) d 15＝2.32 n＝1.52542 v d8＝55.78
r 16=-41.640 d 16=variable
r 17＝∞ d 17＝0.50 n d9＝1.54771 v d9＝62.84
r 18＝∞ d 18＝0.50
r 19＝∞ d 19＝0.50 n d10＝1.51633 v d10＝64.14
r 20＝∞ d 20＝0.50
r 21＝∞(I)
Asphericity coefficient
The 5th
R＝-19.900
K＝0.089
A 4＝7.68359e-04 A 6＝-2.74885e-05 A 8＝5.05160e-07
A 10＝-3.51817e-09
The 6th
R＝4.735
K＝-0.296
A 4＝2.06227e-04 A 6＝1.05145e-05 A 8＝-3.20724e-06
A 10＝5.51277e-08
The 10th
R＝5.243
K＝-0.166
A 4＝-3.57087e-04 A 6＝6.29255e-05 A 8＝-2.02800e-07
A 10＝1.01728e-06
The 11st
R＝-14.423
K＝0.000
A 4＝1.07710e-03 A 6＝7.69622e-05 A 8＝3.07399e-06
A 10＝1.50112e-06
The 15th
R＝12.620
K＝-1.490
A 4＝5.63156e-05 A 6＝3.25061e-06 A 8＝-1.24032e-07
A 10＝2.58656e-09
Zoom data (∞)
WE ST TE
f(mm) 6.62 14.41 31.64
F NO 3.82 4.77 6.00
2ω(°) 62.97 29.10 13.54
d 4 1.12 7.18 12.54
d 8 12.66 6.25 1.55
d 14 5.19 8.85 14.31
d 16 3.01 3.57 3.17
Embodiment 5
r 1＝84.159 d 1＝0.80 n d1＝2.00170 v d1＝20.64
r 2＝34.486 d 2＝0.10
r 3＝22.651 d 3＝2.64 n d2＝1.76802 v d2＝49.24
r 4=-68.862 (AS) d 4=variable
r 5＝-22.850(AS) d 5＝0.87 n d3＝1.88300 v d3＝40.76
r 6＝5.672(AS) d 6＝1.94
r 7＝11.112 d 7＝2.21 n d4＝1.94595 v d4＝17.98
r 8=35.757 d 8=variable
r 9＝∞(S) d 9＝0.10
r 10＝4.712(AS) d 10＝2.61 n d5＝1.58913 v d5＝61.14
r 11＝-14.330(AS) d 11＝0.10
r 12＝7.122 d 12＝1.40 n d6＝1.73400 v d6＝51.47
r 13＝38.362 d 13＝0.80 n d7＝2.00069 v d7＝25.46
r 14=3.667 d 14=variable
r 15＝14.436(AS) d 15＝2.07 n d8＝1.74330 v d8＝49.33
r 16=-91.806 d 16=variable
r 17＝∞ d 17＝0.40 n d9＝1.54771 v d9＝62.84
r 18＝∞ d 18＝0.50
r 19＝∞ d 19＝0.50 n d10＝1.51633 v d10＝64.14
r 20＝∞ d 20＝0.35
r 21＝∞(I)
Asphericity coefficient
The 4th
R＝-68.862
K＝0.000
A 4＝1.40060e-05 A 6＝4.74804e-08 A 8＝-1.12302e-09
A 10＝6.63012e-12
The 5th
R＝-22.850
K＝0.005
A 4＝4.03460e-04 A 6＝-7.22829e-06 A 8＝6.48822e-08
A 10＝-8.73779e-11
The 6th
R＝5.672
K＝-0.125
A 4＝-1.79384e-04 A 6＝1.31075e-05 A 8＝-1.16124e-06
A 10＝8.98567e-09
The 10th
R＝4.712
K＝-0.084
A 4＝-3.51732e-04 A 6＝2.84641e-05 A 8＝5.84562e-06
A 10＝4.88769e-07
The 11st
R＝-14.330
K＝0.000
A 4＝1.77733e-03 A 6＝5.54637e-05 A 8＝1.61880e-05
A 10＝5.93748e-07
The 15th
R＝14.436
K＝0.000
A 4＝-4.85530e-05 A 6＝2.21564e-05 A 8＝-1.01006e-06
A 10＝1.88543e-08
Zoom data (∞)
WE ST TE
f(mm) 5.06 12.01 24.25
F NO 3.39 4.97 5.05
2ω(°)79.96 35.52 17.47
d 4 0.65 4.60 15.76
d 8 12.81 4.53 1.33
d 14 2.79 8.13 8.51
d 16 2.64 3.14 2.93
Embodiment 6
r 1＝62.175 d 1＝0.80 n d1＝2.00170 v d1＝20.64
r 2＝30.238 d 2＝0.10
r 3＝22.683 d 3＝2.74 n d2＝1.76802 v d2＝49.24
r 4=-70.003 (AS) d 4=variable
r 5＝-21.636(AS) d 5＝0.87 n d3＝1.83481 v d3＝42.71
r 6＝5.619(AS) d 6＝2.02
r 7＝11.015 d 7＝2.12 n d4＝1.94595 v d4＝17.98
r 8=28.744 d 8=variable
r 9＝∞(S) d 9＝0.10
r 10＝4.673(AS) d 10＝2.61 n d5＝1.58913 v d5＝61.14
r 11＝-14.486(AS) d 11＝0.10
r 12＝6.566 d 12＝1.30 n d6＝1.67790 v d6＝50.72
r 13＝28.591 d 13＝0.80 n d7＝2.00069 v d7＝25.46
r 14=3.627 d 14=variable
r 15＝13.996(AS) d 15＝2.07 n d8＝1.74330 v d8＝49.33
r 16=-127.391 d 16=variable
r 17＝∞ d 17＝0.40 n d9＝1.54771 v d9＝62.84
r 18＝∞ d 19＝0.50
r 19＝∞ d 19＝0.50 n d10＝1.51633 v d10＝64.14
r 20＝∞ d 20＝0.35
r 21＝∞(I)
Asphericity coefficient
The 4th
R＝-70.003
K＝0.000
A 4＝1.20840e-05 A 6＝7.76197e-08 A 8＝-1.68487e-09
A 10＝1.05563e-11
The 5th
R＝-21.636
K＝0.004
A 4＝4.00902e-04 A 6＝-7.46870e-06 A 8＝7.98424e-08
A 10＝-2.55494e-10
The 6th
R＝5.619
K＝-0.119
A 4＝-1.83831e-04 A 6＝1.27460e-05 A 8＝-1.17445e-06
A 10＝9.45337e-09
The 10th
R＝4.673
K＝-0.080
A 4＝-3.64410e-04 A 6＝3.88128e-05 A 8＝3.87823e-06
A 10＝7.28414e-07
The 11st
R＝-14.486
K＝0.000
A 4＝1.77598e-03 A 6＝8.31238e-05 A 8＝9.04999e-06
A 10＝1.61068e-06
The 15th
R＝13.996
K＝0.000
A 4＝-4.62486e-05 A 6＝2.50668e-05 A 8＝-1.31854e-06
A 10＝2.85912e-08
Zoom data (∞)
WE ST TE
f(mm) 5.06 12.03 24.30
F NO 3.38 4.95 5.05
2ω(°) 80.22 35.50 17.42
d 4 0.67 4.59 15.71
d 8 12.79 4.54 1.39
d 14 2.79 8.12 8.57
d 16 2.63 3.11 2.92
Embodiment 7
r 1＝94.096 d 1＝0.80 n d1＝2.00170 v d1＝20.64
r 2＝36.640 d 2＝0.10
r 3＝23.265 d 3＝2.68 n d2＝1.76802 v d2＝49.24
r 4=-65.988 (AS) d 4=variable
r 5＝-20.758(AS) d 5＝0.87 n d3＝1.88300 v d3＝40.76
r 6＝5.946(AS) d 6＝2.00
r 7＝13.375 d 7＝1.88 n d4＝2.10227 v d4＝17.10
r 8=42.000 d 8=variable
r 9＝∞(S) d 9＝0.10
r 10＝4.646(AS) d 10＝2.61 n d5＝1.58913 v d5＝61.14
r 11＝-14.474(AS) d 11＝0.10
r 12＝6.683 d 12＝1.31 n d6＝1.67790 v d6＝50.72
r 13＝34.534 d 13＝0.80 n d7＝2.00069 v d7＝25.46
r 14=3.633 d 14=variable
r 15＝14.262(AS) d 15＝2.07 n d8＝1.74330 v d8＝49.33
r 16=-68.293 d 16=variable
r 17＝∞ d 17＝0.40 n d9＝1.54771 v d9＝62.84
r 18＝∞ d 18＝0.50
r 19＝∞ d 19＝0.50 n d10＝1.51633 v d10＝64.14
r 20＝∞ d 20＝0.40
r 21＝∞(I)
Asphericity coefficient
The 4th
R＝-65.988
K＝0.000
A 4＝1.39994e-05 A 6＝4.31110e-08 A 8＝-9.73594e-10
A 10＝5.44916e-12
The 5th
R＝-20.758
K＝0.005
A 4＝3.78537e-04 A 6＝-5.56165e-06 A 8＝2.61919e-08
A 10＝2.68069e-10
The 6th
R＝5.946
K＝-0.124
A 4＝-2.24793e-04 A 6＝1.51367e-05 A 8＝-1.22207e-06
A 10＝1.37423e-08
The 10th
R＝4.646
K＝-0.078
A 4＝-3.99703e-04 A 6＝3.77334e-05 A 8＝3.98996e-06
A 10＝7.39900e-07
The 11st
R＝-14.474
K＝0.000
A 4＝1.73950e-03 A 6＝8.20306e-05 A 8＝9.91441e-06
A 10＝1.46222e-06
The 15th
R＝14.262
K＝0.000
A 4＝-6.90526e-05 A 6＝2.21932e-05 A 8＝-9.10533e-07
A 10＝1.48759e-08
Zoom data (∞)
WE ST TE
f(mm) 5.06 11.93 24.27
F NO 3.40 4.98 5.05
2ω(°) 80.76 35.88 17.48
d 4 0.67 4.54 15.84
d 8 12.77 4.58 1.31
d 14 2.83 8.28 8.63
d 16 2.62 3.08 2.92
Embodiment 8
r 1＝58.074 d 1＝0.80 n d1＝2.00170 v d1＝20.64
r 2＝29.126 d 2＝0.10
r 3＝22.139 d 3＝2.59 n d2＝1.76802 v d2＝49.24
r 4=-78.668 (AS) d 4=variable
r 5＝-25.718(AS) d 5＝0.87 n d3＝1.88300 v d3＝40.76
r 6＝5.522(AS) d 6＝1.79
r 7＝10.009 d 7＝2.14 n d4＝1.94595 v d4＝17.98
r 8=26.958 d 8=variable
r 9＝∞(S) d 9＝1.56
r 10＝5.426(AS) d 10＝2.61 n d5＝1.58913 v d5＝61.14
r 11＝-11.325(AS) d 11＝0.10
r 12＝6.525 d 12＝1.54 n d6＝1.69680 v d6＝55.53
r 13＝23.505 d 13＝0.80 n d7＝2.00069 v d7＝25.46
r 14=3.652 d 14=variable
r 15＝14.723(AS) d 15＝2.07 n d8＝1.74330 v d8＝49.33
r 16=-65.589 d 16=variable
r 17＝∞ d 17＝0.40 n d9＝1.54771 v d9＝62.84
r 18＝∞ d 18＝0.50
r 19＝∞ d 19＝0.50 n d10＝1.51633 v d10＝64.14
r 20＝∞ d 20＝0.35
r 21＝∞(I)
Asphericity coefficient
The 4th
R＝-78.668
K＝0.000
A 4＝1.24220e-05 A 6＝2.39631e-08 A 8＝-6.58210e-10
A 10＝3.80349e-12
The 5th
R＝-25.718
K＝0.004
A 4＝4.03510e-04 A 6＝-1.13800e-05 A 8＝1.76519e-07
A 10＝-9.01353e-10
The 6th
R＝5.522
K＝-0.098
A 4＝-1.95478e-04 A 6＝1.65430e-05 A 8＝-2.04581e-06
A 10＝3.13050e-08
The 10th
R＝5.426
K＝-0.062
A 4＝-7.09426e-04 A 6＝1.45894e-05 A 8＝-1.51869e-06
A 10＝3.20154e-07
The 11st
R＝-11.325
K＝0.000
A 4＝7.97676e-04 A 6＝3.43174e-05 A 8＝-2.71403e-06
A 10＝4.90147e-07
The 15th
R＝14.723
K＝0.000
A 4＝-3.54230e-05 A 6＝1.63624e-05 A 8＝-6.04370e-07
A 10＝9.12960e-09
Zoom data (∞)
WE ST TE
f(mm) 5.06 11.98 24.27
F NO 3.16 4.67 5.05
2ω(°) 80.53 35.52 17.46
d 4 0.64 4.47 15.72
d 8 11.04 3.51 1.29
d 14 2.77 8.06 8.79
d 16 2.60 3.16 2.95
Embodiment 9
r 1＝99.053 d 1＝0.80 n d1＝2.00170 v d1＝20.64
r 2＝36.640 d 2＝0.10
r 3＝23.602 d 3＝2.72 n d2＝1.76802 v d2＝49.24
r 4=-61.570 (AS) d 4=variable
r 5＝-18.955(AS) d 5＝0.84 n d3＝1.81600 v d3＝46.62
r 6＝6.082(AS) d 6＝2.15
r 7＝15.037 d 7＝1.72 n d4＝2.10227 v d4＝17.10
r 8=42.000 d 8=variable
r 9＝∞(S) d 9＝0.10
r 10＝4.594(AS) d 10＝2.61 n d5＝1.58913 v d5＝61.14
r 11＝-14.782(AS) d 11＝0.10
r 12＝7.013 d 12＝1.29 n d6＝1.67790 v d6＝50.72
r 13＝35.080 d 13＝0.80 n d7＝2.00069 v d7＝25.46
r 14=3.735 d 14=variable
r 15＝14.317(AS) d 15＝2.07 n d8＝1.74330 v d8＝49.33
r 16=-56.567 d 16=variable
r 17＝∞ d 17＝0.40 n d9＝1.54771 v d9＝62.84
r 18＝∞ d 18＝0.50
r 19＝∞ d 19＝0.50 n d10＝1.51633 v d10＝64.14
r 20＝∞ d 20＝0.37
r 21＝∞(I)
Asphericity coefficient
The 4th
R＝-61.570
K＝0.000
A 4＝1.41315e-05 A 6＝4.18374e-08 A 8＝-9.02777e-10
A 10＝4.86502e-12
The 5th
R＝-18.955
K＝0.005
A 4＝4.04887e-04 A 6＝-6.53532e-06 A 8＝6.53892e-08
A 10＝-1.64331e-10
The 6th
R＝6.082
K＝-0.124
A 4＝-1.71542e-04 A 6＝1.45171e-05 A 8＝-1.17570e-06
A 10＝1.72357e-08
The 10th
R＝4.594
K＝-0.078
A 4＝-3.30111e-04 A 6＝4.86037e-05 A 8＝3.10752e-06
A 10＝9.98370e-07
The 11st
R＝-14.782
K＝0.000
A 4＝1.89564e-03 A 6＝1.06499e-04 A 8＝6.77189e-06
A 10＝2.31800e-06
The 15th
R＝14.317
K＝0.000
A 4＝-7.77744e-05 A 6＝1.98878e-05 A 8＝-7.24814e-07
A 10＝9.65808e-09
Zoom data (∞)
WE ST TE
f(mm) 5.06 11.89 24.27
F NO 3.37 4.92 4.99
2ω(°) 81.17 35.94 17.43
d 4 0.67 4.57 15.91
d 8 12.76 4.53 1.15
d 14 2.81 8.30 8.66
d 16 2.67 3.09 2.96
Aberration diagram when Figure 10 A represents that to Figure 18 C the infintie object point of embodiment 1 to 9 is focused.In these figure, Figure 10 A, 11A, 12A ... spherical aberration (SA), astigmatism (FC), distorton aberration (DT) and the multiplying power chromatic aberation (CC) of expression wide-angle side; Figure 10 B, 11B, 12B ... spherical aberration (SA), astigmatism (FC), distorton aberration (DT) and the multiplying power chromatic aberation (CC) of expression intermediateness; Figure 10 C, 11C, 12C ... spherical aberration (SA), astigmatism (FC), distorton aberration (DT) and the multiplying power chromatic aberation (CC) of expression telescope end." FIY " is maximum image height degree among each figure.
The value of the condition among each embodiment is as follows.
Figure G2007101477041D00591
In each embodiment, realized considering the zoom lens optical system that is easy to make the camera attenuation with the high magnification change ratio about 5 times.And can keep the image quality of captured picture well, be applicable to electro-photographic elements such as CCD or CMOS.And realized reducing the zoom lens optical system that constitutes the lens number of zoom lens.By these structures, can under the situation of the portability of not damaging camera, satisfy the user and wish to compare the requirement of in the past widening the photography zone.
And among each embodiment, if the shutter unit that moves with brightness aperture one is set, then shutter unit needn't be very large-scale, very little the getting final product of no sensillary area when brightness aperture and shutter unit are moved.
And, the dazzle aperture can also be set outside the brightness aperture for by unwanted light such as ghost image, dazzles.The dazzle aperture can be configured between object side, the 1st lens combination and the 2nd lens combination of the 1st lens combination, on the arbitrary position between the 2nd lens combination and the 3rd lens combination, between the 3rd lens combination and the 4th lens combination, between the 4th lens combination and the image planes.Both can constitute and remove dazzle light, again miscellaneous part can be set with members of frame.Can also directly on optical system, print or carry out application or adhesive sealant etc. in addition.And the shape of dazzle aperture can be by circle, ellipse, Any shape such as scope that rectangle, polygon, function curve surrounded.And not only can remove harmful light beam, can also remove the light beam of broom shape dazzle around the picture etc.
And can reflect each lens and prevent coating, alleviate ghost image, dazzle.The preferred laminated coating that uses, it can alleviate ghost image, dazzle effectively.Can also on lens face, cloche etc., carry out the infrared ray cut coating.
In addition, in order to prevent to produce ghost image, dazzle, general air surface of contact to lens reflects and prevents coating (anti-reflection coating).On the other hand, on the composition surface that engages lens, the refractive index of the refractive index ratio air of binding material is much bigger.Therefore in most cases the same with the refractive index of signal layer coating originally or be lower than the refractive index of signal layer coating, seldom specially reflect and prevent coating.
If prevent from coating from then can alleviate ghost image, dazzle, and obtain preferable image but also the bonding area polar region is imposed reflection.Particularly popularizing the nitre material of high index of refraction recently, its effective on aberration correction, thereby be used for the camera optics system more, but with the nitre material of high index of refraction as under the situation that engages lens, can not ignore the reflection on the composition surface.In this case, on the composition surface, impose reflection in advance and prevent that coating from being effectively.
About effective using method of composition surface coating, open in Japanese kokai publication hei 2-27301 number, TOHKEMY 2001-324676 number, TOHKEMY 2005-92115 number, USP7116482 number etc.In these documents, specified the coating layer on the composition surface of the joint lens in the 1st lens combination that just is arranged on (positive-lead type) zoom lens of going ahead of the rest, about the joint lens face in the 1st lens combination of positive amplification ratio of the present invention, implement to get final product as the disclosed content of these documents.As the coating material that uses, according to the Ta that suitably selects high index as the refractive index of the refractive index of the lens of substrate and binding material 2O 5, TiO 2, Nb 2O 5, ZrO 2, HfO 2, CeO 2, SnO 2, In 2O 3, ZnO, Y 2O 3Deng, than the MgF of low-refraction 2, SiO 2, Al 2O 3Deng, be set at the thickness that satisfies phase condition and get final product.
Coating to the air surface of contact of lens can be carried out the composition surface coating with laminated coating equally.By coating material and the thickness of appropriate combination more than 2 layers or 2 layers, thereby can further reduce reflectivity, carry out the control etc. of the dichroism/angular characteristics etc. of reflectivity.And can carry out the composition surface coating to the lens composition surface outside the 1st lens combination according to same thought.
And preferably focus by the mobile of the 4th lens combination.If focus with the 4th lens combination, the load that then imposes on motor owing to lens weight is light is less.And then, since when focusing zoom lens total length neither can change, also can be at lens barrel internal configurations driving motor, so be favourable to the miniaturization of lens barrel.
Can also in the 1st, the 2nd or the 3rd lens combination, focus.Can also move a plurality of lens combination focuses.And can send lens system integral body and focus, a part of camera lens is moved focus.
Can also alleviate the shade of the brightness of image periphery by the micro lens that is arranged in the ccd image sensor is shifted.For example can also change the design that is arranged at the micro lens in the ccd image sensor according to the incident angle of the light on each image height degree.Also can come the slippage of correcting image periphery by Flame Image Process.
But also can in optical system, produce distorton aberration wittingly, after taking, carry out electrical image and handle correcting distortion.
If the image to the color separately of RGB carries out the correction of distorton aberration and multiplying power independently, then also can carry out electricity to the multiplying power chromatic aberation simultaneously and proofread and correct.
Figure 19 is the concept map of structure of having used the digital camera of zoom lens of the present invention to Figure 21.Figure 19 is the place ahead stereographic map of the outward appearance of expression digital camera, and Figure 20 is the back view of the digital camera of Figure 19, and Figure 21 is the schematic cross-section of the digital camera of Figure 19.In Figure 19 and Figure 21, express photographic optical system at non-state when flexible.
Digital camera 140 has: have and photograph with the photographic optical system 141 of light path 142, the finder optical system 143 with view finder usefulness light path 144, shutter release button 145, flashlamp 146, LCD monitor 147, focal length change button 161, setting alternation switch 162 etc.When photographic optical system 141 flexible, thereby cover photographic optical system 141, finder optical system 143 and flashlamp 146 with cover 160 by sliding closure 160.If open cover 160 camera 140 settings are become photography state, then photographic optical system 141 becomes non-flexible state shown in Figure 21.If push the shutter release button 145 on the top that is configured in camera 140, then photograph by photographic optical system 141 with its interlock.In the example of Figure 21, the zoom lens that uses embodiment 1 is as photographic optical system 141.Utilize photographic optical system 141, low-pass filter F and the cloche C and on the shooting face of ccd image sensor 149 form of the picture of captured object by being provided with wavelength region may restriction coating.The object that is received by ccd image sensor 149 looks like to be converted into electric signal, is presented on the LCD monitor 147 that is arranged on the camera back side as electronic image via processing unit 151.And, being connected with record cell 152 on the processing unit 151, it can write down captured electronic image.This record cell 152 both can be wholely set with processing unit 151, can be provided with separately again.As record cell 152, can use hard disk drive (HDD), storage card, DVD etc.
Dispose view finder on light path 144 with objective lens optical system 153 at view finder.View finder is made of a plurality of lens combination (being 3 lens combination among the figure) and 2 prisms with objective lens optical system 153, for changing the varifocal optical system of focal length linkedly with the zoom of photographic optical system 141.With objective lens optical system 153, on as visual field frame 157, form the object picture by view finder as the upright prism 155 of upright parts (image erectingmember).Dispose the eyepiece optical system 159 that upright object is looked like to be directed to observer's eyeball E at the rear of upright prism 155.Emitting side at eyepiece optical system 159 disposes cap assembly 150.
The digital camera 140 that constitutes like this uses zoom lens of the present invention as photographic optical system 141.Therefore the thickness when flexible is minimum, have high magnification change ratio, and the imaging performance in whole change multiplying power zone is all very stable.So can realize high performance, miniaturization and the wide-angleization of camera.
Can realize considering the zoom lens that can form the picture of good image quality that is easy to make the camera attenuation with the high magnification change ratio about 5 times by the present invention.This zoom lens also is applicable to electro-photographic elements combination such as ccd image sensor or CMOS types of image sensors and uses.
And can provide the electronic image pickup device that has used this zoom lens.
Obviously, about foregoing invention, has multi-form variation.Such variation should not be regarded as a departure from the spirit and scope of the present invention.It is emphasized that the definition to scope of the present invention should be embodied by accompanying Claim book and equivalents thereof.All conspicuous changes for persons skilled in the art are included in the accompanying Claim book scope.

Claims (43)

1. zoom lens, this zoom lens is made of the 3rd lens combination of the 2nd lens combination of the 1st lens combination of positive light coke, negative power, positive light coke and the 4th lens combination with positive light coke in order from object side,
Changing multiplying power in telescope end from wide-angle side, the interval of the interval of the interval of above-mentioned the 1st lens combination and above-mentioned the 2nd lens combination, above-mentioned the 2nd lens combination and above-mentioned the 3rd lens combination, above-mentioned the 3rd lens combination and above-mentioned the 4th lens combination changes,
Above-mentioned the 2nd lens combination is constituted, and is met the following conditions by negative lens, these 2 lens of positive lens in order from object side:
1.88＜n d2p＜2.20 (1A)
13.0＜v d2p＜30.0 (2A)
Wherein, n D2pBe that positive lens in the 2nd lens combination is for refractive index, the v of d line D2pBe the Abbe number of the positive lens in the 2nd lens combination,
This zoom lens also has the brightness aperture,
When changing multiplying power to telescope end from wide-angle side, above-mentioned the 1st lens combination, above-mentioned the 2nd lens combination, above-mentioned the 3rd lens combination and above-mentioned the 4th lens combination move, big, above-mentioned the 2nd lens combination diminishes with interval between above-mentioned the 3rd lens combination so that the interval between above-mentioned the 1st lens combination and above-mentioned the 2nd lens combination becomes, the interval change between above-mentioned the 3rd lens combination and above-mentioned the 4th lens combination greatly
Above-mentioned brightness aperture moves along optical axis direction with the 3rd lens combination.
2. zoom lens according to claim 1 is characterized in that, the above-mentioned positive lens of above-mentioned the 2nd lens combination be satisfy following condition to the protruding meniscus lens of object side,
-5.0＜SF 2p＜-1.0 (3A)
SF wherein 2pBy SF 2p=(R 2pf+ R 2pr)/(R 2pf-R 2pr) define R 2pfBe the paraxial radius-of-curvature of face of the object side of the above-mentioned positive lens in above-mentioned the 2nd lens combination, R 2prIt is the paraxial radius-of-curvature of face of the picture side of the above-mentioned positive lens in above-mentioned the 2nd lens combination.
3. zoom lens according to claim 1 is characterized in that this zoom lens satisfies following conditions,
0.12＜|f 2/f t|＜0.60 (4A)
Wherein, f 2Be the focal length of above-mentioned the 2nd lens combination, f tIt is the system-wide focal length of above-mentioned zoom lens of telescope end.
4. zoom lens according to claim 1 is characterized in that this zoom lens satisfies following conditions,
1.76＜n d2n＜2.00 (5A)
35.0＜V d2n＜50.0 (6A)
Wherein, n D2nBe that above-mentioned negative lens in above-mentioned the 2nd lens combination is for the refractive index of d line, V D2nIt is the Abbe number of the above-mentioned negative lens in above-mentioned the 2nd lens combination.
5. zoom lens according to claim 1 is characterized in that, the above-mentioned negative lens in above-mentioned the 2nd lens combination is the biconcave lens that satisfies following condition,
0.35＜SF 2n＜1.00 (7A)
SF wherein 2nBy SF 2n=(R 2nf+ R 2nr)/(R 2nf-R 2nr) define R 2nfBe the paraxial radius-of-curvature of face of the object side of the above-mentioned negative lens in the 2nd lens combination, R 2nrIt is the paraxial radius-of-curvature of face of the picture side of the above-mentioned negative lens in the 2nd lens combination.
6. zoom lens according to claim 1 is characterized in that, at least one lens face of the above-mentioned negative lens of above-mentioned the 2nd lens combination is an aspheric surface, and satisfies following conditions,
0.030＜(|ASP 2nf|+|ASP 2nr|)/f w＜0.320 (8A)
Wherein, ASP 2nfBe the aspheric surface side-play amount of lens face of the object side of the above-mentioned negative lens in above-mentioned the 2nd lens combination, ASP 2nrBe the aspheric surface side-play amount of lens face of the picture side of the above-mentioned negative lens in above-mentioned the 2nd lens combination, f wIt is the system-wide focal length of above-mentioned zoom lens of wide-angle side.
7. zoom lens according to claim 6 is characterized in that, the aspheric surface of the above-mentioned negative lens in above-mentioned the 2nd lens combination is from the big more aspheric surface of optical axis then focal power far away more.
8. zoom lens according to claim 7 is characterized in that, the above-mentioned negative lens in above-mentioned the 2nd lens combination is a biconcave lens, the face of the object side of above-mentioned biconcave lens, all is from the big more aspheric surface of optical axis then focal power far away more as the face of side.
9. zoom lens according to claim 1 is characterized in that, the lens sum in above-mentioned the 1st lens combination is below 2.
10. zoom lens according to claim 9 is characterized in that, above-mentioned the 1st lens combination is made of negative lens, these 2 lens of positive lens in order from object side.
11. zoom lens according to claim 9 is characterized in that, above-mentioned the 1st lens combination is made of negative lens, these 2 lens of positive lens in order from object side, and the negative lens of above-mentioned the 1st lens combination engages with positive lens.
12. zoom lens according to claim 1 is characterized in that, the lens sum in above-mentioned the 3rd lens combination is below 3.
13. zoom lens according to claim 12 is characterized in that, above-mentioned the 3rd lens combination is made of positive lens, positive lens, these 3 lens of negative lens in order from object side.
14. zoom lens according to claim 13 is characterized in that, the above-mentioned negative lens of above-mentioned the 3rd lens combination engages with the above-mentioned positive lens of adjacent object side.
15. zoom lens according to claim 1 is characterized in that, this zoom lens satisfies following condition
0.50＜f 1/f t＜2.00 (10A)
F wherein 1Be the focal length of above-mentioned the 1st lens combination, f tIt is the focal length of the above-mentioned zoom lens of telescope end.
16. zoom lens according to claim 1 is characterized in that, this zoom lens satisfies following condition
0.16＜f 3/f t＜0.80 (11A)
F wherein 3Be the focal length of above-mentioned the 3rd lens combination, f tIt is the focal length of the above-mentioned zoom lens of telescope end.
17. zoom lens according to claim 1 is characterized in that, this zoom lens satisfies following condition
0.24＜f 4/f t＜0.80 (12A)
F wherein 4Be the focal length of above-mentioned the 4th lens combination, f tIt is the system-wide focal length of above-mentioned zoom lens of telescope end.
18. zoom lens according to claim 1 is characterized in that, when changing multiplying power to telescope end from wide-angle side,
Above-mentioned the 1st lens combination moves so that more close object side when telescope end than in wide-angle side the time,
Above-mentioned the 2nd lens combination moves,
Above-mentioned the 3rd lens combination only moves to object side,
Above-mentioned the 4th lens combination moves,
Above-mentioned brightness aperture between above-mentioned the 2nd lens combination and above-mentioned the 3rd lens combination, when above-mentioned change multiplying power and above-mentioned the 3rd lens combination become one and move along optical axis direction.
19. an electronic image pickup device is characterized in that, this electronic image pickup device comprises: the described zoom lens of claim 1; And
Be configured in the picture side of above-mentioned zoom lens, will be converted to the electro-photographic element of electric signal by the formed optical image of above-mentioned zoom lens.
20. a zoom lens, this zoom lens is made of the 3rd lens combination of the 2nd lens combination of the 1st lens combination of positive light coke, negative power, positive light coke and the 4th lens combination with positive light coke in order from object side,
Changing multiplying power in telescope end from wide-angle side, the interval of the interval of the interval of above-mentioned the 1st lens combination and above-mentioned the 2nd lens combination, above-mentioned the 2nd lens combination and above-mentioned the 3rd lens combination, above-mentioned the 3rd lens combination and above-mentioned the 4th lens combination changes,
Above-mentioned the 2nd lens combination is constituted, and is met the following conditions by negative lens, these 2 lens of positive lens in order from object side:
1.88＜n d2p＜2.20 (1A)
13.0＜v d2p＜30.0 (2A)
Wherein, n D2pBe that positive lens in the 2nd lens combination is for refractive index, the v of d line D2pBe the Abbe number of the positive lens in the 2nd lens combination,
Lens sum in above-mentioned the 1st lens combination is below 2,
Above-mentioned the 1st lens combination is made of negative lens, these 2 lens of positive lens, and the negative lens and the positive lens of above-mentioned the 1st lens combination are respectively simple lens,
The axle of the above-mentioned negative lens of above-mentioned the 1st lens combination and above-mentioned positive lens is gone up and is satisfied following condition at interval
0.0＜L 1np/L 1＜0.2 (9A)
Wherein, L 1npBe that the above-mentioned negative lens of the 1st lens combination and the axle of above-mentioned positive lens are gone up at interval L 1The axle that is above-mentioned the 1st lens combination is gone up gross thickness.
21. a zoom lens, this zoom lens is made of the 3rd lens combination of the 2nd lens combination of the 1st lens combination of positive light coke, negative power, positive light coke and the 4th lens combination with positive light coke in order from object side,
Changing multiplying power in telescope end from wide-angle side, the interval of the interval of the interval of above-mentioned the 1st lens combination and above-mentioned the 2nd lens combination, above-mentioned the 2nd lens combination and above-mentioned the 3rd lens combination, above-mentioned the 3rd lens combination and above-mentioned the 4th lens combination changes,
Above-mentioned the 2nd lens combination is constituted, and is met the following conditions by negative lens, these 2 lens of positive lens in order from object side:
1.88＜n d2p＜2.20 (1A)
13.0＜v d2p＜30.0 (2A)
Wherein, n D2pBe that positive lens in the 2nd lens combination is for refractive index, the v of d line D2pBe the Abbe number of the positive lens in the 2nd lens combination,
Lens sum in above-mentioned the 3rd lens combination is below 3,
Above-mentioned the 3rd lens combination is made of positive lens, these 2 lens of negative lens in order from object side, and the lens in above-mentioned the 3rd lens combination add up to 2.
22. a zoom lens is characterized in that, this zoom lens is made of the 3rd lens combination of the 2nd lens combination of the 1st lens combination of positive light coke, negative power, positive light coke and the 4th lens combination with positive light coke in order from object side,
Changing multiplying power in telescope end from wide-angle side,
The interval of the interval of the interval of above-mentioned the 1st lens combination and above-mentioned the 2nd lens combination, above-mentioned the 2nd lens combination and above-mentioned the 3rd lens combination, above-mentioned the 3rd lens combination and above-mentioned the 4th lens combination changes,
Above-mentioned the 1st lens combination is made of positive lens and these 2 lens of negative lens, and the lens in above-mentioned the 1st lens combination add up to 2,
Above-mentioned the 2nd lens combination is made of negative lens, these 2 lens of positive lens in order from object side, and the lens in above-mentioned the 2nd lens combination add up to 2, and meet the following conditions:
1.78＜n d2n＜2.10 (1B)
35.0＜v d2n＜50.0 (2B)
Wherein, n D2nBe that negative lens in the 2nd lens combination is for refractive index, the v of d line D2nBe the Abbe number of the negative lens in the 2nd lens combination,
This zoom lens also has the brightness aperture,
When changing multiplying power to telescope end from wide-angle side, above-mentioned the 1st lens combination, above-mentioned the 2nd lens combination, above-mentioned the 3rd lens combination and above-mentioned the 4th lens combination move, big, above-mentioned the 2nd lens combination diminishes with interval between above-mentioned the 3rd lens combination so that the interval between above-mentioned the 1st lens combination and above-mentioned the 2nd lens combination becomes, the interval change between above-mentioned the 3rd lens combination and above-mentioned the 4th lens combination greatly
Above-mentioned brightness aperture moves along optical axis direction with the 3rd lens combination.
23. zoom lens according to claim 22 is characterized in that, this zoom lens satisfies following condition,
0.6＜|f 1n|/f t＜5.0 (A)
0.08＜|f 2n|/f t＜0.35 (B)
5.0＜|f 1n|/|f 2n|＜25.0 (C)
Wherein, f 1nBe the focal length of the negative lens in the 1st lens combination, f 2nBe the focal length of the negative lens in the 2nd lens combination, f tIt is the system-wide focal length of zoom lens of telescope end.
24. zoom lens according to claim 22 is characterized in that, this zoom lens satisfies following condition:
1.4＜|f 1n|/f 1p＜4.5 (D)
Wherein, f 1pBe the focal length of the positive lens in the 1st lens combination, f 1nIt is the focal length of the negative lens in the 1st lens combination.
25. zoom lens according to claim 22 is characterized in that, the above-mentioned positive lens of above-mentioned the 2nd lens combination is that what to satisfy following condition is protruding meniscus lens at object side,
-5.0＜SF 2p＜-1.0 (3A)
SF wherein 2pBy SF 2p=(R 2pf+ R 2pr)/(R 2pf-R 2pr) define R 2pfBe the paraxial radius-of-curvature of face of the object side of the above-mentioned positive lens in above-mentioned the 2nd lens combination, R 2prIt is the paraxial radius-of-curvature of face of the picture side of the above-mentioned positive lens in above-mentioned the 2nd lens combination.
26. zoom lens according to claim 22 is characterized in that, this zoom lens satisfies following conditions:
0.12＜|f 2/f t|＜0.60 (4A)
Wherein, f 2Be the focal length of above-mentioned the 2nd lens combination, f tIt is the focal length of the above-mentioned zoom lens of telescope end.
27. zoom lens according to claim 22 is characterized in that, this zoom lens meets the following conditions:
1.88＜n d2p＜2.20 (1A)
13.0＜v d2p＜30.0 (2A)
Wherein, n D2pBe that positive lens in the 2nd lens combination is for refractive index, the v of d line D2pIt is the Abbe number of the positive lens in the 2nd lens combination.
28. zoom lens according to claim 22 is characterized in that, the above-mentioned negative lens in above-mentioned the 2nd lens combination is the biconcave lens that satisfies following condition,
0.35＜SF 2n＜1.00 (7A)
SF wherein 2nBy SF 2n=(R 2nf+ R 2nr)/(R 2nf-R 2nr) define R 2nfBe the paraxial radius-of-curvature of face of the object side of the above-mentioned negative lens in the 2nd lens combination, R 2nrIt is the paraxial radius-of-curvature of face of the picture side of the above-mentioned negative lens in the 2nd lens combination.
29. zoom lens according to claim 22 is characterized in that, at least one lens face of the above-mentioned negative lens of above-mentioned the 2nd lens combination is an aspheric surface, and satisfies following conditions,
0.030＜(|ASP 2nf|+|ASP 2nr|)/f w＜0.320 (8A)
Wherein, ASP 2nfBe the aspheric surface side-play amount of lens face of the object side of the above-mentioned negative lens in above-mentioned the 2nd lens combination, ASP 2nrBe the aspheric surface side-play amount of lens face of the picture side of the above-mentioned negative lens in above-mentioned the 2nd lens combination, f wIt is the focal length of the above-mentioned zoom lens of wide-angle side.
30. zoom lens according to claim 29 is characterized in that, the aspheric surface of the above-mentioned negative lens in above-mentioned the 2nd lens combination is from the big more aspheric surface of optical axis then focal power far away more.
31. zoom lens according to claim 28 is characterized in that, the above-mentioned negative lens in above-mentioned the 2nd lens combination is a biconcave lens, the face of the object side of above-mentioned biconcave lens, all is from the big more aspheric surface of optical axis then focal power far away more as the face of side.
32. zoom lens according to claim 22 is characterized in that, above-mentioned the 1st lens combination is made of negative lens, these 2 lens of positive lens in order from object side.
33. zoom lens according to claim 32 is characterized in that, the above-mentioned negative lens in above-mentioned the 1st lens combination engages with above-mentioned positive lens.
34. zoom lens according to claim 22 is characterized in that, the lens in above-mentioned the 3rd lens combination add up to below 3.
35. zoom lens according to claim 34 is characterized in that, above-mentioned the 3rd lens combination is made of positive lens, positive lens, these 3 lens of negative lens in order from object side.
36. zoom lens according to claim 35 is characterized in that, the above-mentioned negative lens of above-mentioned the 3rd lens combination engages with the above-mentioned positive lens of adjacent object side.
37. zoom lens according to claim 22 is characterized in that, this zoom lens satisfies following condition
0.50＜f 1/f t＜2.00 (10A)
F wherein 1Be the focal length of above-mentioned the 1st lens combination, f tIt is the focal length of the above-mentioned zoom lens of telescope end.
38. zoom lens according to claim 22 is characterized in that, this zoom lens satisfies following condition
0.16＜f 3/f t＜0.80 (11A)
F wherein 3Be the focal length of above-mentioned the 3rd lens combination, f tIt is the focal length of the above-mentioned zoom lens of telescope end.
39. zoom lens according to claim 22 is characterized in that, this zoom lens satisfies following condition
0.24＜f 4/f t＜0.80 (12A)
F wherein 4Be the focal length of above-mentioned the 4th lens combination, f tIt is the focal length of the above-mentioned zoom lens of telescope end.
40. zoom lens according to claim 22 is characterized in that, when changing multiplying power to telescope end from wide-angle side,
Above-mentioned the 1st lens combination moves so that more close object side when telescope end than in wide-angle side the time,
Above-mentioned the 2nd lens combination moves,
Above-mentioned the 3rd lens combination only moves to object side,
Above-mentioned the 4th lens combination moves,
Above-mentioned brightness aperture between above-mentioned the 2nd lens combination and above-mentioned the 3rd lens combination, when above-mentioned change multiplying power and above-mentioned the 3rd lens combination move along optical axis direction integratedly.
41. an electronic image pickup device is characterized in that, this electronic image pickup device comprises: the described zoom lens of claim 22; And
Be configured in the picture side of above-mentioned zoom lens, will be converted to the electro-photographic element of electric signal by the formed optical image of above-mentioned zoom lens.
42. a zoom lens is characterized in that, this zoom lens is made of the 3rd lens combination of the 2nd lens combination of the 1st lens combination of positive light coke, negative power, positive light coke and the 4th lens combination with positive light coke in order from object side,
Changing multiplying power in telescope end from wide-angle side,
The interval of the interval of the interval of above-mentioned the 1st lens combination and above-mentioned the 2nd lens combination, above-mentioned the 2nd lens combination and above-mentioned the 3rd lens combination, above-mentioned the 3rd lens combination and above-mentioned the 4th lens combination changes,
Above-mentioned the 1st lens combination is made of positive lens and these 2 lens of negative lens, and the lens in above-mentioned the 1st lens combination add up to 2,
Above-mentioned the 2nd lens combination is made of negative lens, these 2 lens of positive lens in order from object side, and the lens in above-mentioned the 2nd lens combination add up to 2, and meet the following conditions:
1.78＜n d2n＜2.10 (1B)
35.0＜v d2n＜50.0 (2B)
Wherein, n D2nBe that negative lens in the 2nd lens combination is for refractive index, the v of d line D2nBe the Abbe number of the negative lens in the 2nd lens combination,
Above-mentioned the 1st lens combination is made of negative lens, these 2 lens of positive lens in order from object side,
Negative lens and positive lens in above-mentioned the 1st lens combination are respectively simple lens,
The axle of the negative lens of above-mentioned the 1st lens combination and positive lens is gone up and is satisfied following condition at interval
0.0＜L 1np/L 1＜0.2 (9A)
Wherein, L 1npBe that the above-mentioned negative lens of the 1st lens combination and the axle of above-mentioned positive lens are gone up at interval L 1The axle that is above-mentioned the 1st lens combination is gone up gross thickness.
43. a zoom lens is characterized in that, this zoom lens is made of the 3rd lens combination of the 2nd lens combination of the 1st lens combination of positive light coke, negative power, positive light coke and the 4th lens combination with positive light coke in order from object side,
Changing multiplying power in telescope end from wide-angle side,
The interval of the interval of the interval of above-mentioned the 1st lens combination and above-mentioned the 2nd lens combination, above-mentioned the 2nd lens combination and above-mentioned the 3rd lens combination, above-mentioned the 3rd lens combination and above-mentioned the 4th lens combination changes,
Above-mentioned the 1st lens combination is made of positive lens and these 2 lens of negative lens, and the lens in above-mentioned the 1st lens combination add up to 2,
Above-mentioned the 2nd lens combination is made of negative lens, these 2 lens of positive lens in order from object side, and the lens in above-mentioned the 2nd lens combination add up to 2, and meet the following conditions:
1.78＜n d2n＜2.10 (1B)
35.0＜v d2n＜50.0 (2B)
Wherein, n D2nBe that negative lens in the 2nd lens combination is for refractive index, the v of d line D2nBe the Abbe number of the negative lens in the 2nd lens combination,
Lens in above-mentioned the 3rd lens combination add up to below 3,
Above-mentioned the 3rd lens combination is made of positive lens, these 2 lens of negative lens in order from object side,
Lens in above-mentioned the 3rd lens combination add up to 2.
CN2007101477041A 2006-08-25 2007-08-24 Zoom lens system and electronic image pickup apparatus using the same Expired - Fee Related CN101131466B (en)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
JP2006-229300 2006-08-25
JP2006229300A JP4906439B2 (en) 2006-08-25 2006-08-25 Zoom lens and electronic imaging apparatus using the same
JP2006229220 2006-08-25
JP2006229300 2006-08-25
JP2006229220A JP4900923B2 (en) 2006-08-25 2006-08-25 Zoom lens and electronic imaging apparatus using the same
JP2006-229220 2006-08-25

Publications (2)

Publication Number Publication Date
CN101131466A CN101131466A (en) 2008-02-27
CN101131466B true CN101131466B (en) 2010-06-09

Family

ID=39128797

Family Applications (1)

Application Number Title Priority Date Filing Date
CN2007101477041A Expired - Fee Related CN101131466B (en) 2006-08-25 2007-08-24 Zoom lens system and electronic image pickup apparatus using the same

Country Status (2)

Country Link
JP (1) JP4900923B2 (en)
CN (1) CN101131466B (en)

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5026763B2 (en) * 2006-10-16 2012-09-19 株式会社リコー Zoom lens, imaging device, and portable information terminal device
US7830613B2 (en) 2008-06-20 2010-11-09 Olympus Imaging Corp. Zoom lens and an imaging apparatus incorporating the same
US8462442B2 (en) 2008-09-11 2013-06-11 Panasonic Corporation Zoom lens system, imaging device and camera
WO2010029736A1 (en) * 2008-09-11 2010-03-18 パナソニック株式会社 Zoom lens system, imaging device and camera
WO2010029737A1 (en) 2008-09-11 2010-03-18 パナソニック株式会社 Zoom lens system, imaging device and camera
US8325424B2 (en) 2008-09-19 2012-12-04 Panasonic Corporation Zoom lens system, imaging device and camera
US8325425B2 (en) 2008-09-19 2012-12-04 Panasonic Corporation Zoom lens system, imaging device and camera
JP2010091881A (en) * 2008-10-09 2010-04-22 Olympus Imaging Corp Imaging optical system and electronic imaging apparatus having the same
KR101553836B1 (en) * 2009-01-12 2015-09-17 삼성전자주식회사 Zoom lens and imaging optical device having the same
KR101917228B1 (en) * 2011-08-17 2019-01-29 엘지이노텍 주식회사 Imaging lens
CN107315238B (en) * 2017-08-17 2019-10-25 福建福光股份有限公司 A kind of high-resolution zoom camera lens
CN107390351B (en) * 2017-09-07 2023-04-11 深圳市永诺摄影器材股份有限公司 Optical system and optical apparatus
CN109991724B (en) * 2019-04-16 2023-11-28 佛山科学技术学院 Double telecentric fixed-focus optical system
CN114137699B (en) * 2021-12-06 2024-02-02 湖北久之洋红外系统股份有限公司 Small high-resolution athermalized medium-wave infrared optical system

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1991433A (en) * 2005-12-20 2007-07-04 佳能株式会社 Zoom lens system and image pickup apparatus including the zoom lens system

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2984469B2 (en) * 1992-06-30 1999-11-29 キヤノン株式会社 Rear focus zoom lens
JP3542552B2 (en) * 2000-09-29 2004-07-14 キヤノン株式会社 Zoom lens and optical device using the same
JP4678823B2 (en) * 2004-11-09 2011-04-27 オリンパスイメージング株式会社 Zoom lens

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1991433A (en) * 2005-12-20 2007-07-04 佳能株式会社 Zoom lens system and image pickup apparatus including the zoom lens system

Also Published As

Publication number Publication date
JP2008052110A (en) 2008-03-06
CN101131466A (en) 2008-02-27
JP4900923B2 (en) 2012-03-21

Similar Documents

Publication Publication Date Title
CN101131466B (en) Zoom lens system and electronic image pickup apparatus using the same
CN100552488C (en) Zoom lens and the electronic image pickup device that uses this zoom lens
CN100504493C (en) Zoom lens and electronic image pickup apparatus using the same
US7755848B2 (en) Zoom lens system and electronic image pickup apparatus using the same
CN101256272B (en) Zoom lens system and electronic image pickup apparatus using the same
US8102606B2 (en) Zoom lens system and electronic image pickup apparatus using the same
CN101661157B (en) Zoom lens and image pickup apparatus equipped with same
US8582211B2 (en) Zoom lens and image pickup apparatus equipped with same
JP5051844B2 (en) Zoom lens and imaging apparatus using the same
US7515354B2 (en) Zooms lens system and electronic image pickup apparatus using the same
JP2009186983A (en) Zoom lens and imaging apparatus with the same
CN101403820A (en) Two-unit zoom lens and image pickup apparatus equipped with same
JP2009098449A (en) Zoom lens and imaging apparatus having the same
US7477457B2 (en) Zoom lens system and electronic image pickup apparatus using the same
US7433132B2 (en) Zoom lens system and electronic image pickup apparatus using the same
JP5197247B2 (en) Zoom lens and image pickup apparatus having the same
JP2010134373A (en) Image pickup apparatus
JP2010060903A (en) Zoom lens and image pickup device including the same
JP2010019959A (en) Zoom lens and image pickup apparatus equipped with the same
US7675690B2 (en) Zoom lens system and electronic image pickup apparatus using the same
JP2012103416A (en) Zoom lens and imaging apparatus using the same
JP2002090625A (en) Zoom lens and imaging device provided therewith
JP5695497B2 (en) Zoom lens and image pickup apparatus using the same
JP5075645B2 (en) Zoom lens and image pickup apparatus using the same
JP2010060915A (en) Zoom lens and image pickup device including the same

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
C14 Grant of patent or utility model
GR01 Patent grant
C56 Change in the name or address of the patentee
CP03 Change of name, title or address

Address after: Tokyo, Japan, Japan

Patentee after: Olympus Corporation

Address before: Tokyo, Japan

Patentee before: Olympus Imaging Corp.

CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20100609

Termination date: 20200824

CF01 Termination of patent right due to non-payment of annual fee