CN101271189B - Zoom lens, optical apparatus, and imaging method - Google Patents

Zoom lens, optical apparatus, and imaging method Download PDF

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Publication number
CN101271189B
CN101271189B CN2008100852612A CN200810085261A CN101271189B CN 101271189 B CN101271189 B CN 101271189B CN 2008100852612 A CN2008100852612 A CN 2008100852612A CN 200810085261 A CN200810085261 A CN 200810085261A CN 101271189 B CN101271189 B CN 101271189B
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lens
mentioned
lens combination
negative
combination
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CN101271189A (en
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武俊典
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Nikon Corp
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Nikon Corp
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Abstract

In a zoom lens ZL having a plurality of lens groups which are disposed in order from an object, a first lens group that is disposed to closest to the object among the plurality of lens groups has positive refractive power and comprises a light path bending element which bends the path of light and a plurality of lens components which are disposed closer to the object than the light path bending element, and the plurality of lens components comprise at least one negative lens whose refractive index with respect to d-line exceeds 1.90.

Description

Zoom lens, optical device and formation method
Technical field
The present invention relates to the zoom lens that use in the optical devices such as a kind of digital still camera.
Background technology
Optical device such as digital still camera, video recorder generally is equipped with zoom lens, suitable zoom lens by motion a lot (for example opening the 2006-171492 communique) with reference to Japanese Patent Laid.Now, in optical devices such as digital still camera, pay much attention to portability,, and require miniaturization and lightweight as the zoom lens of photographic lens for miniaturization, slimming, the lightweight of camera body.Wherein, the zoom lens of the optical element that can make approximately crooked 90 degree of light path have been proposed in the part of lens combination, to have.Through carrying this zoom lens, when collecting state becomes user mode, can be outstanding from camera body, portability is also very excellent under user mode.In addition, miniaturization, the slimming of camera have significantly been realized.
Yet majority has the zoom lens of the optical element that can make approximately crooked 90 degree of light path, owing to preferential miniaturization, slimming, thereby causes the focal length under the wide-angle side state to become big, and wide viewing angleization is out in the cold.Therefore the user can't take bigger scope, can't obtain the effect of distant view (perspective) near being taken body.In addition; In can the existing zoom lens of crooked light path; Have a plurality of lens combination that are arranged in order from object side, be provided with in the 1st lens combination of in these a plurality of lens combination, arranging near object side: make the crooked light path bender element of light path and rely on a plurality of lens compositions of object side configuration than light path bender element.
But in this existing zoom lens, have following problem: if do not maximize at the lens composition of the object side of light path bender element configuration, just can't increase the visual angle, the photography under the wide-angle side is limited.
Summary of the invention
The present invention produces in view of this problem just, its purpose be to provide a kind of can be in wide viewing angle with zoom lens, optical device and the formation method of the high imaging performance of small-sized acquisition.
To achieve these goals; Zoom lens of the present invention; Have a plurality of lens combination that are arranged in order along optical axis from object side, it is characterized in that, have positive refractive power in the 1st lens combination of arranging near object side in above-mentioned a plurality of lens combination; And have the crooked light path bender element of the light path of making, reach a plurality of lens compositions in the object side configuration of above-mentioned light path bender element
Above-mentioned a plurality of lens composition comprises a refractive index to the d line at least and surpasses 1.90 negative lens.
In above-mentioned zoom lens; Preferably; When near the negative lens of object side the refractive index of d line being made as nd1 in above-mentioned a plurality of lens compositions; Satisfy the condition of formula nd1＞1.90, and with in above-mentioned a plurality of lens compositions when the refractive index of d line being made as nd2 as the negative lens of side, satisfy the condition of formula nd2＞1.90.
In above-mentioned zoom lens, preferably, above-mentioned a plurality of lens compositions are 2 lens.
In above-mentioned zoom lens; Preferably; With near the negative lens of object side the refractive index of d line being made as in nd1, the above-mentioned a plurality of lens compositions when as the negative lens of side the refractive index of d line being made as nd2 in above-mentioned a plurality of lens compositions, satisfy the condition of formula 0.7＜nd1/nd2＜1.1.
In above-mentioned zoom lens; Preferably; When near the negative lens of object side the Abbe number of d line being made as ν d1 in above-mentioned a plurality of lens compositions; Satisfy the condition of formula ν d1＜50, and with in above-mentioned a plurality of lens compositions when the Abbe number of d line being made as ν d2 as the negative lens of side, satisfy the condition of formula ν d2＜50.
In above-mentioned zoom lens; Preferably; With near the negative lens of object side the Abbe number of d line being made as in ν d1, the above-mentioned a plurality of lens compositions when as the negative lens of side the Abbe number of d line being made as ν d2 in above-mentioned a plurality of lens compositions, satisfy the condition of formula 0.4＜ν d1/ ν d2＜1.3.
In above-mentioned zoom lens; Preferably; Above-mentioned light path bender element is a prism, will be from above-mentioned the 1st lens combination is made as L1 in the distance on the optical axis till the above-mentioned prism, when the distance of above-mentioned prism on optical axis is made as Lp, satisfies the condition of formula L1/Lp＜1.0 near the face of object side.
In above-mentioned zoom lens; Preferably; The focal length of above-mentioned the 1st lens combination is made as in f1, the above-mentioned a plurality of lens combination when the focal length of the 2nd lens combination of arranging as side of above-mentioned the 1st lens combination is made as f2, satisfies formula 1.9＜f1/ (condition f2)＜2.5.
In above-mentioned zoom lens, preferably, the 2nd lens combination of arranging as side in above-mentioned the 1st lens combination in above-mentioned a plurality of lens combination has negative refractive index,
When the focal length that the focal length that the lens combination under the wide-angle side state is whole is made as fw, above-mentioned the 2nd lens combination is made as f2, satisfy formula 1.2＜(f2)/condition of fw＜1.8.
In above-mentioned zoom lens, preferably, above-mentioned light path bender element is a prism,
When above-mentioned prism is made as ndp to the refractive index of d line, satisfy the condition of formula ndp＞1.80.
In above-mentioned zoom lens, preferably, above-mentioned a plurality of lens combination comprise above-mentioned the 1st lens combination, the 2nd lens combination, the 3rd lens combination and the 4th lens combination that is arranged in order along optical axis from object side.
In above-mentioned zoom lens, preferably, above-mentioned the 2nd lens combination has negative refractive power, and above-mentioned the 3rd lens combination has positive refractive power, and above-mentioned the 4th lens combination has positive refractive power.
In above-mentioned zoom lens, preferably, above-mentioned the 1st lens combination and above-mentioned the 3rd lens combination are being fixed during to the telescope end zoom from wide-angle side,
Above-mentioned the 2nd lens combination and above-mentioned the 4th lens combination move along optical axis during to the telescope end zoom from wide-angle side above-mentioned.
In above-mentioned zoom lens, preferably, above-mentioned a plurality of lens compositions have the negative concave-convex lens of convex surface towards object side.
In above-mentioned zoom lens, preferably, above-mentioned the 1st lens combination has the positive lens in the picture side configuration of above-mentioned light path bender element.
In above-mentioned zoom lens, preferably, above-mentioned the 1st lens combination has aspheric lens composition.
In above-mentioned zoom lens, preferably, the visual angle under the wide-angle side state is more than 75 degree.
Optical device of the present invention has the zoom lens that the picture that makes object forms images on predetermined face, it is characterized in that zoom lens are above-mentioned zoom lens.
Formation method of the present invention, the picture that utilizes zoom lens to make object forms images on predetermined face, and these zoom lens have a plurality of lens combination that are arranged in order along optical axis from object side, and above-mentioned formation method is characterised in that,
Make the 1st lens combination of arranging near object side in above-mentioned a plurality of lens combination have positive refractive power,
The light path bender element that makes light path crooked is set in above-mentioned the 1st lens combination, and disposes a plurality of lens compositions at the object side of above-mentioned light path bender element,
Make above-mentioned a plurality of lens composition comprise a refractive index at least and surpass 1.90 negative lens the d line.
In above-mentioned formation method; Preferably; When near the negative lens of object side the refractive index of d line being made as nd1 in above-mentioned a plurality of lens compositions; Satisfy the condition of formula nd1＞1.90, and with in above-mentioned a plurality of lens compositions when the refractive index of d line being made as nd2 as the negative lens of side, satisfy the condition of formula nd2＞1.90.
In above-mentioned formation method, preferably, above-mentioned a plurality of lens compositions are 2 lens.
In above-mentioned formation method; Preferably; With near the negative lens of object side the refractive index of d line being made as in nd1, the above-mentioned a plurality of lens compositions when as the negative lens of side the refractive index of d line being made as nd2 in above-mentioned a plurality of lens compositions, satisfy the condition of formula 0.7＜nd1/nd2＜1.1.
In above-mentioned formation method; Preferably; When near the negative lens of object side the Abbe number of d line being made as ν d1 in above-mentioned a plurality of lens compositions; Satisfy the condition of formula ν d1＜50, and with in above-mentioned a plurality of lens compositions when the Abbe number of d line being made as ν d2 as the negative lens of side, satisfy the condition of formula ν d2＜50.
In above-mentioned formation method; Preferably; With near the negative lens of object side the Abbe number of d line being made as in ν d1, the above-mentioned a plurality of lens compositions when as the negative lens of side the Abbe number of d line being made as ν d2 in above-mentioned a plurality of lens compositions, satisfy the condition of formula 0.4＜ν d1/ ν d2＜1.3.
In above-mentioned formation method; Preferably; Above-mentioned light path bender element is a prism, will be from above-mentioned the 1st lens combination is made as L1 in the distance on the optical axis till the above-mentioned prism, when the distance of above-mentioned prism on optical axis is made as Lp, satisfies the condition of formula L1/Lp＜1.0 near the face of object side.
In above-mentioned formation method; Preferably; The focal length of above-mentioned the 1st lens combination is made as in f1, the above-mentioned a plurality of lens combination when the focal length of the 2nd lens combination of arranging as side of above-mentioned the 1st lens combination is made as f2, satisfies formula 1.9＜f1/ (condition f2)＜2.5.
In above-mentioned formation method; Preferably; The 2nd lens combination of arranging as side in above-mentioned the 1st lens combination in above-mentioned a plurality of lens combination has negative refractive index; When the focal length that the focal length that the lens combination under the wide-angle side state is whole is made as fw, above-mentioned the 2nd lens combination is made as f2, satisfy formula 1.2＜(f2)/condition of fw＜1.8.
In above-mentioned formation method, preferably, above-mentioned light path bender element is a prism, when above-mentioned prism is made as ndp to the refractive index of d line, satisfies the condition of formula ndp＞1.80.
In above-mentioned formation method, preferably, above-mentioned a plurality of lens combination comprise above-mentioned the 1st lens combination, the 2nd lens combination, the 3rd lens combination and the 4th lens combination that is arranged in order along optical axis from object side.
In above-mentioned formation method, preferably, above-mentioned the 2nd lens combination has negative refractive power, and above-mentioned the 3rd lens combination has positive refractive power, and above-mentioned the 4th lens combination has positive refractive power.
In above-mentioned formation method, preferably, above-mentioned the 1st lens combination and above-mentioned the 3rd lens combination are being fixed during to the telescope end zoom from wide-angle side, and above-mentioned the 2nd lens combination and above-mentioned the 4th lens combination move along optical axis during to the telescope end zoom from wide-angle side above-mentioned.
In above-mentioned formation method, preferably, above-mentioned a plurality of lens compositions have the negative concave-convex lens of convex surface towards object side.
In above-mentioned formation method, preferably, above-mentioned the 1st lens combination has the positive lens in the picture side configuration of above-mentioned light path bender element.
In above-mentioned formation method, preferably, above-mentioned the 1st lens combination has aspheric lens composition.
In above-mentioned formation method, preferably, the visual angle under the wide-angle side state is more than 75 degree.
According to the present invention, can be with the high imaging performance of small-sized acquisition in wide viewing angle.
Description of drawings
Figure 1A is the front view (FV) of digital still camera, and Figure 1B is the back view of digital still camera.
Fig. 2 is the sectional view of the arrow II-II in Figure 1A.
Fig. 3 is the key diagram of the refractive power configuration of expression zoom lens.
Fig. 4 is the sectional view of formation of the zoom lens of the 1st embodiment.
Fig. 5 is each aberration diagram under the wide-angle side state of the focus for infinity state under the 1st embodiment.
Fig. 6 is each aberration diagram under the intermediate focus distance state of the focus for infinity state under the 1st embodiment.
Fig. 7 is each aberration diagram under the telescope end state of the focus for infinity state under the 1st embodiment.
Fig. 8 is the sectional view of formation of the zoom lens of the 2nd embodiment.
Fig. 9 is each aberration diagram under the wide-angle side state of the focus for infinity state under the 2nd embodiment.
Figure 10 is each aberration diagram under the intermediate focus distance state of the focus for infinity state under the 2nd embodiment.
Figure 11 is each aberration diagram under the telescope end state of the focus for infinity state under the 2nd embodiment.
Figure 12 is the sectional view of formation of the zoom lens of the 3rd embodiment.
Figure 13 is each aberration diagram under the wide-angle side state of the focus for infinity state under the 3rd embodiment.
Figure 14 is each aberration diagram under the intermediate focus distance state of the focus for infinity state under the 3rd embodiment.
Figure 15 is each aberration diagram under the telescope end state of the focus for infinity state under the 3rd embodiment.
Figure 16 is the sectional view of formation of the zoom lens of the 4th embodiment.
Figure 17 is each aberration diagram under the wide-angle side state of the focus for infinity state under the 4th embodiment.
Figure 18 is each aberration diagram under the intermediate focus distance state of the focus for infinity state under the 4th embodiment.
Figure 19 is each aberration diagram under the telescope end state of the focus for infinity state under the 4th embodiment.
Figure 20 is the sectional view of formation of the zoom lens of the 5th embodiment.
Figure 21 is each aberration diagram under the wide-angle side state of the focus for infinity state under the 5th embodiment.
Figure 22 is each aberration diagram under the intermediate focus distance state of the focus for infinity state under the 5th embodiment.
Figure 23 is each aberration diagram under the telescope end state of the focus for infinity state under the 5th embodiment.
Embodiment
Following with reference to description of drawings preferred implementation of the present invention.Fig. 1 representes to have the digital still camera CAM of zoom lens ZL of the present invention.In addition, Figure 1A representes the front view (FV) of digital still camera, and Figure 1B representes back view.Fig. 2 is the sectional view along the arrow II-II of Figure 1A in addition, states the summary of zoom lens ZL after the expression.
Fig. 1 and digital still camera CAM shown in Figure 2; After pushing not shown power knob; The not shown shutter of photographic lens (ZL) is opened, and, and on the imaging apparatus C that is disposed on the image planes I, forms images through photographic lens (ZL) optically focused from the light of the body that is taken (object).The body image that is taken that on imaging apparatus C, forms images is presented on the LCD monitor M of the behind that is disposed at digital still camera CAM.The cameraman has determined to be taken when observing LCD monitor M behind the composition of body image, presses release-push B1, and with the imaging apparatus C shooting body image that is taken, and recorded and stored is in not shown storer.
Photographic lens is made up of zoom lens ZL of the present invention; Light from the positive incident of digital still camera CAM; Make light path (the paper below of Fig. 2) crooked about 90 degree downwards through the light path bender element P in the zoom lens ZL, therefore can make digital still camera CAM slimming.In addition, in digital still camera CAM, dispose: the D of auxiliary light portion that when the body that is taken is dark, sends fill-in light; Be used to make zoom lens ZL from wide-angle (W) from wide-angle side state (W) to telescope end state (T) zoom-(T) button B2 looks in the distance; And the function button B3 etc. that is used for the various condition enactments etc. of digital still camera CAM.
Zoom lens ZL comprises and being arranged in order from object side along optical axis: comprise light path bender element P and have positive refractive power the 1st lens combination G1, have negative refractive power the 2nd lens combination G2, have the 3rd a lens combination G3 of positive refractive power and have the 4th lens combination G4 of positive refractive power.In addition; From wide-angle side when the telescope end zoom; The 1st lens combination G1 and the 3rd lens combination G3 fix with respect to image planes I, and the 2nd lens combination G2 and the 4th lens combination G4 move along optical axis, thereby the interval of the 1st lens combination G1 and the 2nd lens combination G2 increases; Reduce at the interval of the 2nd lens combination G2 and the 3rd lens combination G3, and reduce at the interval of the 3rd lens combination G3 and the 4th lens combination G4.In addition, the filter set LP that configuration is made up of low-pass filter, infrared prevention filtrator etc. between zoom lens ZL and image planes I.
The 1st lens combination G1 has the effect of crooked about 90 degree of the light path of making and the effect of converging beam.In addition, when the telescope end zoom, the 1st lens combination G1 always is fixed from wide-angle side.So, need not make in the lens combination that constitutes zoom lens ZL maximum and to have the 1st a lens combination G1 of weight movable, therefore can simplified structure.
The 2nd lens combination G2 has the effect of the picture of the body that is taken (object) that amplification forms by the 1st lens combination G1, along with from the wide-angle side state towards the telescope end state, increase the interval of the 1st lens combination G1 and the 2nd lens combination G2, thereby improve magnification, change focal length.
The 3rd lens combination G3 has the light beam convergent effect of being amplified by the 2nd lens combination G2 that makes; In order to realize high performance; Constitute the 3rd lens combination G3 by a plurality of lens compositions, spherical aberration, sine condition, Po Zi cut down and the state of (Petzval sum) to have realized proofreading and correct well.
The 4th lens combination G4 has to be made by the 3rd lens combination G3 convergent light beam convergent effect more; When changing focal length (during zoom) from the wide-angle side state to the telescope end state; Change the interval of the 3rd lens combination G3 and the 4th lens combination G4 energetically, thereby can suppress the change of image planes corresponding with the variation of focal length.
In this zoom lens ZL with a plurality of lens combination; The 1st lens combination G1 that arranges near object side in a plurality of lens combination has positive refractive power; And have crooked light path bender element P of the light path of making and a plurality of lens compositions that are configured in the object side of light path bender element P, these a plurality of lens compositions preferably comprise a refractive index to the d line at least and surpass 1.90 negative lens.Thereby, uprise in the refractive index of the lens composition of object one side of light path bender element P configuration, therefore do not increase the effective diameter and the external diameter of this lens composition, just can increase the visual angle under the wide-angle side.
In addition, refractive index was greater than 1.90 o'clock, and the radius-of-curvature that can increase this lens composition slows down its bending, therefore can reduce the interval of a plurality of lens compositions on optical axis, made the 1st lens combination G1 and then made zoom lens ZL integral miniaturization.And then, dispose a plurality of lens compositions through object one side at light path bender element P, can proofread and correct the spherical aberration and the coma that self are produced by the 1st lens combination G1 well.So, can obtain wide viewing angle and small-sized zoom lens ZL and optical device (digital still camera CAM) with these zoom lens ZL with high imaging performance.
This moment in addition, with the refractive index of d line being made as nd1 in a plurality of lens compositions, when the refractive index of d line being made as nd2, preferably satisfy following conditional (1) and the represented condition of conditional (2) as the negative lens of side near the negative lens of object side.
nd1＞1.90 …(1)
nd2＞1.90 …(2)
Conditional (1) and conditional (2) stipulated the light path bender element P in the 1st lens combination G1 object one side configuration, near the negative lens of object side with near the suitable ranges of indices of refraction of the negative lens of picture side.When not satisfying the condition of conditional (1) and conditional (2), the lens of object one side of light path bender element P maximize.That is, it is big that the effective diameter of the negative lens among the 1st lens combination G1 and the size of external diameter become, from light path bender element P to the most elongated near the length till the lens face of object one side.Its result, the thickness thickening of camera body, thus not preferred.In addition, it is difficult that the correction of coma becomes, and can't obtain high optical property.
In addition, in order to obtain effect of the present invention conscientiously, more preferably making the lower limit of conditional (1) and conditional (2) is 1.91.And then in order to obtain effect of the present invention conscientiously, further preferably making the lower limit of conditional (1) and conditional (2) is 1.92.
In addition, a plurality of lens compositions are preferably 2 lens.So, can constitute the 1st lens combination G1 with the formation number of irreducible minimum.
In addition, with near the negative lens of object side the refractive index of d line being made as nd1 in a plurality of lens compositions, when the refractive index of d line being made as nd2, preferably satisfy the represented condition of following conditional (3) as the negative lens of side.
0.7＜nd1/nd2＜1.1 ……(3)
Conditional (3) stipulated the light path bender element P in the 1st lens combination G1 object one side configuration, near the negative lens of object side with near the combination of the optical material characteristic of the negative lens of picture side.When being higher than the higher limit of conditional (3), it is big that the effective diameter of the negative lens among the 1st lens combination G1 and the size of external diameter become, and it is big, not preferred that camera body becomes.In addition, it is difficult that the correction of coma becomes, and can't obtain high optical property.On the other hand, when being lower than the lower limit of conditional (3), the lens that rely on object side than light path bender element P maximize, and the thickness of camera main body also exerts an influence as a result.And the multiplying power chromatic aberation that in the 1st lens combination G1, produces worsens, and is not preferred.
In addition, in order to obtain effect of the present invention conscientiously, the higher limit that more preferably makes conditional (3) is 1.07.And then in order to obtain effect of the present invention conscientiously, the higher limit that further preferably makes conditional (3) is 1.05.In addition, in order to obtain effect of the present invention conscientiously, the lower limit that more preferably makes conditional (3) is 0.8.And then in order to obtain effect of the present invention conscientiously, the lower limit that further preferably makes conditional (3) is 0.9.And then for practical effect of the present invention, the lower limit that further preferably makes conditional (3) is 0.95.
In addition, with in a plurality of lens compositions near the negative lens of object side to the Abbe number of d line be made as ν d1, will be when the Abbe number of d line being made as ν d2 as the negative lens of side, formula that preferably meets the following conditions (4) and conditional (5).
νd1＜50 …(4)
νd2＜50 …(5)
Conditional (4) and conditional (5) stipulated the light path bender element P in the 1st lens combination G1 object one side configuration, near the negative lens of object side with near the scope of the appropriate optical material of the negative lens of picture side.When not satisfying conditional (4) and conditional (5), be difficult to proofread and correct optical axis chromatic aberation and the multiplying power chromatic aberation that produces by the 1st lens combination G1 self.Can't obtain high optical property.
In addition, in order to obtain effect of the present invention conscientiously, more preferably making the higher limit of conditional (4) and conditional (5) is 37.0.And then in order to obtain effect of the present invention conscientiously, further preferably making the higher limit of conditional (4) and conditional (5) is 34.0.And then in order to obtain effect of the present invention conscientiously, further preferably making the higher limit of conditional (4) and conditional (5) is 32.0.And then in order to obtain effect of the present invention conscientiously, further preferably making the higher limit of conditional (4) and conditional (5) is 30.0.
In addition, with near the negative lens of object side the Abbe number of d line being made as ν d1 in a plurality of lens compositions, when the Abbe number of d line being made as ν d2, preferably satisfy the represented condition of following conditional (6) as the negative lens of side.
0.4＜νd1/νd2＜1.3 …(6)
Conditional (6) stipulated the light path bender element P in the 1st lens combination G1 object one side configuration, near the negative lens of object side with near the combination of the optical material characteristic of the negative lens of picture side.When being higher than the higher limit of conditional (6), it is big that the effective diameter of the negative lens among the 1st lens combination G1 and the size of external diameter become, and it is big, not preferred that camera body becomes.In addition, it is difficult that the correction of coma becomes, and can't obtain high optical property.On the other hand, when being lower than the lower limit of conditional (6), the lens that rely on object side than light path bender element P maximize, and the thickness of camera main body also exerts an influence as a result.And the multiplying power chromatic aberation that in the 1st lens combination G1, produces worsens, and is not preferred.
In addition, in order to obtain effect of the present invention conscientiously, the higher limit that more preferably makes conditional (6) is 1.07.And then in order to obtain effect of the present invention conscientiously, the higher limit that further preferably makes conditional (6) is 1.05.In addition, in order to obtain effect of the present invention conscientiously, the lower limit that more preferably makes conditional (6) is 0.93.And then in order to obtain effect of the present invention conscientiously, the lower limit that further preferably makes conditional (6) is 0.95.
In addition, light path bender element P is a prism, will be from the 1st lens combination G1 be made as L1, prism distance on optical axis when being made as Lp in the distance on the optical axis near the face of object side till the prism, the represented condition of the formula that preferably meets the following conditions (7).
L1/Lp＜1.0 …(7)
Conditional (7) has been stipulated from the 1st lens combination G1 near the face of the object side suitable scope in distance on the optical axis and the distance of light path bender element P on optical axis till the light path bender element P (prism).When being higher than the higher limit of conditional (7), the total length of lens that relies on object side than light path bender element P is elongated, the thickness thickening of optical system.Its result, the thickness of camera main body also exerts an influence, and can't realize miniaturization, slimming.
In addition, in order to obtain effect of the present invention conscientiously, the higher limit that more preferably makes conditional (7) is 0.95.And then in order to obtain effect of the present invention conscientiously, the higher limit that further preferably makes conditional (7) is 0.9.
In addition, when the focal length of the 2nd lens combination G2 that arranges as side that the focal length of the 1st lens combination G1 is made as in f1, a plurality of lens combination at the 1st lens combination G1 is made as f2, the represented condition of the formula that preferably meets the following conditions (8).
1.9＜f1/(-f2)＜2.5 …(8)
Conditional (8) to the focal length of the 1st lens combination G1 and the 2nd lens combination G2 than having stipulated suitable scope.When being higher than the higher limit of conditional (8), the refractive power of the 1st lens combination G1 relatively a little less than, the whole lens external diameter of the 1st lens combination G1 becomes big, can't realize miniaturization.In addition, the refractive power of the 2nd lens combination G2 is stronger relatively, can't suppress the generation of coma, can't obtain high optical property.On the other hand, when being lower than the lower limit of conditional (8), the refractive power of the 1st lens combination G1 is stronger relatively, though help miniaturization, the change of spherical aberration and curvature of the image increases during zoom, and is not preferred.In addition, the refractive power of the 2nd lens combination G2 relatively a little less than, the 2nd lens combination G2 can't become doubly effectively, can't guarantee to become doubly needed amount of movement.
In addition, in order to obtain effect of the present invention conscientiously, the higher limit that more preferably makes conditional (8) is 2.45.And then in order to obtain effect of the present invention conscientiously, the higher limit that further preferably makes conditional (8) is 2.4.In addition, in order to obtain effect of the present invention conscientiously, the lower limit that more preferably makes conditional (8) is 1.92.And then in order to obtain effect of the present invention conscientiously, the lower limit that further preferably makes conditional (8) is 1.95.
In addition as stated; The 2nd lens combination G2 that arranges as side at the 1st lens combination G1 in a plurality of lens combination has negative refractive index; When the focal length that the focal length that the lens combination under the wide-angle side state is whole is made as fw, the 2nd lens combination G2 is made as f2, the represented condition of the formula that preferably meets the following conditions (9).
1.2＜(-f2)/fw＜1.8 …(9)
Conditional (9) has been stipulated the scope of the suitable focal length of the 2nd lens combination G2.When being higher than the higher limit of conditional (9), the refractive power of the 2nd lens combination G2 is stronger, and is excessive by coma and astigmatism that the 2nd lens combination G2 self produces, and it is big, not preferred that the performance variation during close-range photography becomes.Its result is difficult to shorten the shortest photo distance.On the other hand, when being lower than the lower limit of conditional (9), the refractive power of the 2nd lens combination G2 a little less than, the mobile quantitative change during focal adjustments is big, the maximizations such as parts of needed drive system may interfere with each other with miscellaneous part when moving.In addition if then spherical aberration deterioration of miniaturization is not preferred.As a result, can't save the space in the time of in being concealed in camera body.
In addition, in order to obtain effect of the present invention conscientiously, the higher limit that more preferably makes conditional (9) is 1.75.And then in order to obtain effect of the present invention conscientiously, the higher limit that further preferably makes conditional (9) is 1.72.In addition, in order to obtain effect of the present invention conscientiously, the lower limit that more preferably makes conditional (9) is 1.22.And then in order to obtain effect of the present invention conscientiously, the lower limit that further preferably makes conditional (9) is 1.23.
In addition, light path bender element P is a prism, when prism is made as ndp to the refractive index of d line, and the represented condition of the formula that preferably meets the following conditions (10).
ndp＞1.80 …(10)
Conditional (10) has been stipulated the scope of the suitable refractive index of the prism (for example right-angle prism) as light path bender element P.Right-angle prism can make light path deflection with total reflection, can reduce the light quantity loss, and can to make optical system be compact formation.When being lower than the lower limit of conditional (10), the shape of prism is bigger, and zoom lens are whole to become big, not preferred.In addition, coma that in the 1st lens combination G1, produces and multiplying power chromatic aberation worsen.The thickness of camera main body also exerts an influence as a result, can't realize miniaturization.In addition, light path bender element P also can use catoptron, optical fiber etc. except prism.
In addition, in order to obtain effect of the present invention conscientiously, the lower limit that more preferably makes conditional (10) is 1.81.And then in order to obtain effect of the present invention conscientiously, the lower limit that further preferably makes conditional (10) is 1.82.
In addition as stated, constitute a plurality of lens combination of zoom lens ZL, preferably include the 1st lens combination G1, the 2nd lens combination G2, the 3rd lens combination G3 and the 4th lens combination G4 that are arranged in order along optical axis from object side.So, can make the suitable miniaturization of zoom lens ZL.
In addition this moment, preferred the 2nd lens combination G2 has negative refractive power, and the 3rd lens combination G3 has positive refractive power, and the 4th lens combination G4 has positive refractive power.So, can constitute the optical property that obtains hope with minimum.
In addition this moment, preferred the 1st lens combination G1 and the 3rd lens combination G3 are fixing during to the telescope end zoom from wide-angle side, and the 2nd lens combination G2 and the 4th lens combination G4 are moving along optical axis during to the telescope end zoom from wide-angle side.The change of the aberration that so, can reduce to cause because of zoom.
In addition, a plurality of lens compositions preferably have the negative concave-convex lens of convex surface towards object side.So, can make the suitable miniaturization of each lens composition.
In addition this moment, preferred the 1st lens combination has the positive lens in the picture side configuration of light path bender element P.So, through making up the optical property that can obtain to hope with other lenses (for example negative concave-convex lens).
In addition, preferred the 1st lens combination has aspheric lens composition.So, can proofread and correct well in the coma that when telescope end changes focal length (zoom), produces from wide-angle side and the change of astigmatism.And then, can realize the miniaturization of the lens external diameter of the 1st lens combination G1.
In addition, the visual angle under the wide-angle side state is preferably more than 75 degree, more preferably more than 80 degree.So, can make the visual angle, can improve the degree of freedom of photography in a big way.
And then; In this embodiment; In order to make more high performance and miniaturization balance, the 2nd lens combination preferably includes and is arranged in order from object side along optical axis: concave surface is towards sticking together the compound lens with negative refractive power that forms as the negative lens of side and with concave surface towards the negative lens and the positive lens of object side.So, can use simple formation to proofread and correct coma and the multiplying power chromatic aberation that produces by the 2nd lens combination G2 self well.
And then the 2nd lens combination G2 preferably have aspheric lens composition.So, can proofread and correct change well at the coma that produces during to telescope end state variation focal length (zoom) from the wide-angle side state.
In this external embodiment; The 3rd lens combination G3 is in order to proofread and correct the spherical aberration that is produced by the 3rd lens combination G3 self and to make the outgoing pupil location as far as possible away from image planes well; Preferably include simple lens and have the compound lens of negative refractive power with positive refractive power; Specifically, preferably include and be arranged in order from object side along optical axis: convex surface sticks together the compound lens with negative refractive power that forms towards the positive lens of object side and with convex surface towards the positive lens and the concave surface of object side towards the negative lens as side.So, through the positive lens axis of convergence outer light beam of convex surface, make it not break away from optical axis, thereby can realize the miniaturization of lens diameter towards object side.
And then the 3rd lens combination G3 preferably has aspheric lens composition.So, can proofread and correct well in the spherical aberration that when telescope end changes focal length (zoom), produces from wide-angle side and the change of coma.
In this external embodiment; The 4th lens combination G4 is in order to proofread and correct the spherical aberration that is produced by the 4th lens combination G4 self and to make the outgoing pupil location as far as possible away from image planes well; Preferably include simple lens and have the compound lens of negative refractive power with positive refractive power; Specifically, preferably include and be arranged in order from object side along optical axis: convex surface sticks together the compound lens with negative refractive power that forms towards the positive lens of object side and with convex surface towards the positive lens and the concave surface of object side towards the negative lens as side.So, through the positive lens axis of convergence outer light beam of convex surface, make it not break away from optical axis, thereby can realize the miniaturization of lens diameter towards object side.In addition, the 4th lens combination G4 integral body has positive refractive power, penetrates pupil location away from image planes thereby can make, and is suitable for the optical system of solid-state imager as light receiving element.
And then the 4th lens combination G4 preferably has aspheric lens composition.So, can proofread and correct change well at the curvature of the image that when telescope end changes focal length (zoom), produces from wide-angle side.
In this external embodiment; The failure of the photography that causes for the picture shake that prevents in hypermutation times zoom lens, to be easy to generate, cause because of hand shake; Can in lens combination, make up the shake detection system and the driver element of the shake that is used to detect lens combination, make any lens combination in the lens combination that constitutes lens combination in whole or in part as the shift lens group and off-centre.In order to proofread and correct the picture shake (change of image planes position) that shake caused, make image shift by drive unit drives shift lens group, thereby can proofread and correct the picture shake by the detected lens combination of shake detection system.As stated, the zoom lens ZL of this embodiment can be used as the anti-dither optical system and plays a role.
Embodiment
Following with reference to the description of drawings various embodiments of the present invention.The zoom lens ZL of each embodiment comprises being arranged in order from object side along optical axis as stated: have positive refractive power the 1st lens combination G1, have negative refractive power the 2nd lens combination G2, have the 3rd a lens combination G3 of positive refractive power and have the 4th lens combination G4 of positive refractive power.In addition, the filter set FL that configuration is made up of low-pass filter, infrared prevention filtrator etc. between the 4th lens combination and image planes I.
As shown in Figure 3 in addition, when the telescope end zoom, the 2nd lens combination G2 and the 4th lens combination G4 move along optical axis from wide-angle side, and the 1st lens combination G1 and the 3rd lens combination G3 fix with respect to image planes I.At this moment, the interval of the 1st lens combination G1 and the 2nd lens combination G2 increases, and reduce at the interval of the 2nd lens combination G2 and the 3rd lens combination G3, and reduce at the interval of the 3rd lens combination G3 and the 4th lens combination G4.In addition, Fig. 3 is that the refractive power of the zoom lens of expression various embodiments of the present invention distributes and from the figure of wide-angle side state (W) form that moves of each lens combination when telescope end state (T) changes focal length state (zoom).
Following table 1～table 5 is tables of representing the value of the parameter among the 1st～the 5th embodiment respectively.In each table, f representes that focal length, F.No represent that F number, 2 ω represent that visual angle, Bf represent back focus.And then face numbering expression is represented respectively the d line (value of λ=587.6nm) along order, refractive index and the Abbe number of the lens face that begins from object side of the direct of travel of light.In following whole parameter value, the unit of the focal length f that is put down in writing, radius-of-curvature, face interval, other length etc. generally uses " mm ", even but optical system is amplified or scale down also can obtain equal optical property, therefore be not limited thereto.In addition, the record as " 1.00000 " of the refractive index of air has been omitted on radius-of-curvature " 0.0000 " expression plane.
In addition, in each table, be marked with the aspheric surface of * mark, the height on will the direction vertical with optical axis is made as y; The distance along optical axis (sinkage) till from the section on each the aspheric summit under the height y to each aspheric surface is made as S (y), and the radius-of-curvature of benchmark sphere (paraxial radius-of-curvature) is made as r, and the constant of the cone is made as K; N (n=4,6,8; When asphericity coefficient 10) is made as Cn, represent with following conditional (11).In addition, 2 times asphericity coefficient C2 is 0 in each embodiment, omits record.
S(y)＝(y 2/r)/{1+(1-K×y 2/r 2) 1/2}
+C4×y 4+C6×y 6+C8×y 8+C10×yU …(11)
In this external each table; The axle of the 1st lens combination G1 and the 2nd lens combination G2 is gone up the airspace and is made as d8; The axle of the 2nd lens combination G2 and the 3rd lens combination G3 is gone up the airspace and is made as d13; The axle of the 3rd lens combination G3 and the 4th lens combination G4 is gone up the airspace and is made as d19, and the axle of the 4th lens combination G4 and filter set FL is gone up the airspace and is made as d24.These axles are gone up the airspace, and (d19 d24) changes when zoom for d8, d13.
The 1st embodiment
Following with reference to Fig. 4～Fig. 7 and table 1 explanation the 1st embodiment of the present invention.Fig. 4 is the figure of formation of the zoom lens of expression the 1st embodiment.In the zoom lens ZL of Fig. 4, the 1st lens combination G1 comprises and being arranged in order from object side: convex surface towards the negative meniscus lens L11 of object side, convex surface towards the negative meniscus lens L12 of object side so that crooked about 90 degree of light path have the positive lens L13 of aspheric biconvex shape for light path bender element P such as the right-angle prism of purpose and at object side.The 2nd lens combination G2 comprises and being arranged in order from object side: stick together the negative compound lens L22 that forms towards the negative meniscus lens L21 of object side and with the negative lens of concave-concave shape and the positive lens of biconvex shape having aspheric surface and convex surface as side.
The 3rd lens combination G3 comprises and being arranged in order from object side: have the positive lens L31 of aspheric biconvex shape and the positive lens of biconvex shape and the negative lens of concave-concave shape are sticked together the negative compound lens L32 that forms at object side.The 4th lens combination G4 comprises and being arranged in order from object side: stick together the negative compound lens L42 that forms at the positive lens L41 that has aspheric biconvex shape as side and with convex surface towards the negative meniscus lens as side towards the positive concave-convex lens and the concave surface of object side.And, between the 4th lens combination G4 and image planes I, dispose above-mentioned filter set FL.
In addition, image planes I is formed on the not shown imaging apparatus, and this imaging apparatus constitutes (embodiment afterwards too) by CCD, CMOS etc.In addition, aperture diaphragm S is configured among the 3rd lens combination G3, fixes with respect to image planes I when the telescope end zoom from wide-angle side.In addition, in Fig. 4 to have launched the STA representation of light path bender element P.
Each parameter among below table 1 expression the 1st embodiment.In addition, the numbering 1～28 of the face in the table 1 is corresponding to the face among Fig. 4 1～28.In addition, in the 1st embodiment, each lens face of the 7th, the 10th, the 14th and the 21st forms aspherical shape.
(table 1)
[univers parameter]
The wide-angle side intermediate focus is apart from telescope end
f＝4.76 ～ 10.90 ～ 13.60
F.NO＝3.39 ～ 4.50 ～ 5.10
2ω＝80.10 ～ 37.24 ～ 30.08
[lens parameter]
Face numbering radius-of-curvature face is the refractive index Abbe number at interval
1 18.5837 0.80 1.94594 17.98
2 92523 1.95
3 21.1675 0.80 1.94594 17.98
4 12.1051 1.95
5 0.0000 10.00 1.88300 40.76
6 0.0000 0.30
7 * 16.6856 2.59 1.77377 47.17
8 -17.4860 (d8)
9 120.1506 0.80 1.85135 40.10
10 * 8.6224 1.45
11 -11.4881 0.80 1.81600 46.62
12 8.5611 1.31 1.94594 17.98
13 -462.6937 (d13)
14 * 6.2540 1.52 1.58913 61.25
15 -23.4186 0.50
16 0.0000 0.50 (aperture diaphragm S)
17 16.9167 1.87 1.65160 58.55
18 -3.8752 0.80 1.83481 42.71
19 9.4841 (d19)
20 11.5818 2.15 1.60602 57.44
21 * -10.2025 0.20
22 5.6247 2.05 1.49700 81.54
23 36.4651 0.80 1.92286 20.88
24 5.3918 (d24)
25 0.0000 0.55 1.54437 70.51
26 0.0000 0.40
27 0.0000 0.50 1.51633 64.14
28 0.0000 (Bf)
[aspherical surface data]
Face numbering K C4 C6 C8 C10
7 -4.2112 +6.3347×10 -5 -1.3742×10 -6 +2.0994×10 -8 -2.1938×10 -10
10 -9.0000 +1.8903×10 -3 -7.0975×10 -5 +2.6340×10 -6 +3.3830×10 -8
14 +0.2972 +1.1297×10 -4 +1.9446×10 -5 +6.7916×10 -7 -1.0642×10 -8
21 +2.5363 +6.8503×10 -4 -7.8123×10 -7 +1.0665×10 -6 -4.1646×10 -8
[variable interval]
The wide-angle side intermediate focus is apart from telescope end
f 4.7600 10.8950 13.6000
d8 1.2108 5.8514 6.6474
d13 6.4865 1.8460 1.0500
d19 5.9585 2.3201 1.1000
d24 5.1473 8.7857 10.0058
Bf 0.5999 0.5997 0.5996
[condition respective value]
nd1＝1.94594
nd2＝1.94594
νd1＝17.98
νd2＝17.98
L1＝5.500
Lp＝10.000
fw＝4.76000
f1＝14.08549
f2＝-6.63946
ndp＝1.88300
Conditional (1) nd1=1.94594
Conditional (2) nd2=1.94594
Conditional (3) nd1/nd2=1.000
Conditional (4) ν d1=17.98
Conditional (5) ν d2=17.98
Conditional (6) ν d1/ ν d2=1.000
Conditional (7) L1/Lp=0.550
Conditional (8) f1/ (f2)=2.122
Conditional (9) (f2)/fw=1.395
Conditional (10) ndp=1.88300
Thereby in the present embodiment, can know and all satisfy above-mentioned conditional (1)～(10).In addition, with respect to Lp=10.000, L1=5.500, L1 can be more medium and small than prior art.
Fig. 5～Fig. 7 is expression and d line (each aberration diagram of the 1st corresponding embodiment of λ=587.6nm).Promptly; Fig. 5 is each aberration diagram under the focus for infinity state in the wide-angle side state (f=4.76mm); Fig. 6 is each aberration diagram under the focus for infinity state in the intermediate focus state (f=10.90mm), and Fig. 7 is each aberration diagram under the focus for infinity state in the telescope end state (f=13.60mm).
In each aberration diagram, FNO representes the F number, and A representes the half angle of view corresponding with each image height.
In addition, in the aberration diagram of expression astigmatism, solid line is represented sagittal image surface, and dotted line is represented meridianal image surface.And then in the aberration diagram of expression spherical aberration, solid line is represented spherical aberration, and dotted line is represented sine condition.The explanation of above aberration diagram in other embodiments too.And, can know from each aberration diagram, proofreaied and correct each aberration well under each the focal length state in the 1st embodiment till from the wide-angle side state to the telescope end state, have excellent imaging performance.
The 2nd embodiment
Following with reference to Fig. 8～Figure 11 and table 2 explanation the 2nd embodiment of the present invention.Fig. 8 is the figure of formation of the zoom lens of expression the 2nd embodiment.In addition, the zoom lens of the 2nd embodiment are except the formation of the 2nd lens combination, and are identical with the formation of the zoom lens of the 1st embodiment, to each standard laid down by the ministries or commissions of the Central Government with the label identical with the 1st embodiment to omit detailed explanation.In addition, the 2nd lens combination G2 of the 2nd embodiment comprises and being arranged in order from object side: stick together the negative compound lens L22 that forms at the negative lens L21 that has aspheric concave-concave shape as side and with the negative lens and the convex surface of concave-concave shape towards the positive concave-convex lens of object side.
Each parameter among below table 2 expressions the 2nd embodiment.In addition, the numbering 1～28 of the face in the table 2 is corresponding to the face among Fig. 8 1～28.In addition, in the 2nd embodiment, each lens face of the 7th, the 10th, the 14th and the 21st forms aspherical shape.
(table 2)
[univers parameter]
The wide-angle side intermediate focus is apart from telescope end
f＝4.76 ～ 10.90 ～ 16.83
F.NO＝3.43 ～ 4.38 ～ 5.32
2ω＝80.12 ～ 37.24 ～ 24.50
[lens parameter]
Face numbering radius-of-curvature face is the refractive index Abbe number at interval
1 18.7424 0.80 1.94594 17.98
2 9.3864 1.95
3 21.6083 0.80 1.94594 17.98
4 122621 1.95
5 0.0000 10.00 1.88300 40.76
6 0.0000 0.30
7 * 16.8349 2.60 1.77377 47.17
8 -17.3291 (d8)
9 -30.3831 0.80 1.85135 40.10
10 * 9.5012 1.00
11 -33.3537 0.80 1.81600 46.62
12 7.2272 1.38 1.94594 17.98
13 51.7364 (d13)
14 * 6.1623 1.46 1.58913 61.25
15 -32.7052 0.50
16 0.0000 0.50 (aperture diaphragm S)
17 16.2574 1.85 1.65160 58.55
18 -3.7749 0.80 1.83481 42.71
19 9.8126 (d19)
20 11.0508 2.15 1.60602 57.44
21 * -11.7394 0.20
22 6.0262 2.05 1.49700 81.54
23 24.0461 0.80 1.92286 20.88
24 5.4797 (d24)
25 0.0000 0.55 1.54437 70.51
26 0.0000 0.40
27 0.0000 0.50 1.51633 64.14
28 0.0000 (Bf)
[aspherical surface data]
Face numbering K C4 C6 C8 C10
7 -3.8785 +4.8309×10 -5 -8.3247×10 -7 +1.7150×10 -9 +4.4539×10 -11
10 -9.0000 +1.3364×10 -3 -5.0474×10 -5 +1.5973×10 -6 +1.2041×10 -8
14 +0.4450 +1.9519×10 -4 +1.4324×10 -5 +1.3179×10 -6 -6.5285×10 -9
21 +0.2452 +3.9638×10 -4 +1.2430×10 -7 +4.3306×10 -7 -2.1186×10 -8
[variable interval]
The wide-angle side intermediate focus is apart from telescope end
f 4.7600 10.8950 16.8301
d8 1.2174 6.2820 8.0585
d13 7.8909 2.8265 1.0500
d19 6.9417 3.3531 1.1000
d24 5.7090 9.2974 11.5506
Bf 0.5999 0.6000 0.6001
[condition respective value]
nd1＝1.94594
nd2＝1.94594
νd1＝17.98
νd2＝17.98
L1＝5.500
Lp＝10.000
fw＝4.76001
f1＝14.04786
f2＝-6.74050
ndp＝1.88300
Conditional (1) nd1=1.94594
Conditional (2) nd2=1.94594
Conditional (3) nd1/nd2=1.000
Conditional (4) ν d1=17.98
Conditional (5) ν d2=17.98
Conditional (6) ν d1/ ν d2=1.000
Conditional (7) L1/Lp=0.550
Conditional (8) f1/ (f2)=2.084
Conditional (9) (f2)/fw=1.416
Conditional (10) ndp=1.88300
Thereby in the present embodiment, can know and all satisfy above-mentioned conditional (1)～(10).In addition, with respect to Lp=10.000, L1=5.500, L1 can be more medium and small than prior art.
Fig. 9～Figure 11 is expression and d line (each aberration diagram of the 2nd corresponding embodiment of λ=587.6nm).Promptly; Fig. 9 is each aberration diagram under the focus for infinity state in the wide-angle side state (f=4.76mm); Figure 10 is each aberration diagram under the focus for infinity state in the intermediate focus state (f=10.90mm), and Figure 11 is each aberration diagram under the focus for infinity state in the telescope end state (f=16.83mm).And, can know from each aberration diagram, proofreaied and correct each aberration well under each the focal length state in the 2nd embodiment till from the wide-angle side state to the telescope end state, have excellent imaging performance.
The 3rd embodiment
Following with reference to Figure 12～Figure 15 and table 3 explanation the 3rd embodiment of the present invention.Figure 12 is the figure of formation of the zoom lens of expression the 3rd embodiment.In addition, the zoom lens of the 3rd embodiment are except the formation of the 2nd lens combination and aperture diaphragm, and are identical with the formation of the zoom lens of the 1st embodiment, to each standard laid down by the ministries or commissions of the Central Government with the label identical with the 1st embodiment to omit detailed explanation.In addition, the 2nd lens combination G2 of the 3rd embodiment comprises and being arranged in order from object side: stick together the negative compound lens L22 that forms at the negative lens L21 that has aspheric concave-concave shape as side and with the negative lens and the convex surface of concave-concave shape towards the positive concave-convex lens of object side.The aperture diaphragm S of the 3rd embodiment be configured in the 3rd lens combination G3 near object side, fix with respect to image planes I when the telescope end zoom from wide-angle side.
Each parameter among below table 3 expressions the 3rd embodiment.In addition, the numbering 1～28 of the face in the table 3 is corresponding to the face among Figure 12 1～28.In addition, in the 3rd embodiment, each lens face of the 7th, the 10th, the 15th and the 21st forms aspherical shape.
(table 3)
[univers parameter]
The wide-angle side intermediate focus is apart from telescope end
f＝4.76 ～ 10.90 ～ 16.83
F.NO＝3.61 ～ 4.48 ～ 5.31
2ω＝80.08 ～ 37.30 ～ 24.50
[lens parameter]
Face numbering radius-of-curvature face is the refractive index Abbe number at interval
1 18.6003 0.80 1.94594 17.98
2 9.1299 1.95
3 20.0061 0.80 1.94594 17.98
4 12.2378 1.95
5 0.0000 10.00 1.83400 37.16
6 0.0000 0.30
7 * 17.6318 2.59 1.77377 47.17
8 -17.0143 (d8)
9 -95.1601 0.80 1.85l35 40.10
10 * 9.6243 1.05
11 -18.7968 0.80 1.81600 46.62
12 7.0462 1.31 1.94594 17.98
13 49.4372 (d13)
14 0.0000 0.50 (aperture diaphragm S)
15 * 5.7357 1.66 1.58913 61.25
16 -13.8410 0.20
17 27.9825 1.85 1.65160 58.55
18 -4.2034 0.80 1.83481 42.71
19 7.6543 (d19)
20 11.0138 2.15 1.60602 57.44
21 * -11.6568 0.20
22 6.7719 2.05 1.49700 81.54
23 43.7568 0.80 1.92286 20.88
24 6.2063 (d24)
25 0.0000 0.55 1.54437 70.51
26 0.0000 0.40
27 0.0000 0.50 1.51633 64.14
28 0.0000 (Bf)
[aspherical surface data]
Face numbering K C4 C6 C8 C10
7 -3.5829 +3.1195×10 -5 -6.5188×10 -7 +8.6095×10 -10 +4.2745×10 -11
10 -9.0000 +1.3893×10 -3 -3.2887×10 -5 -2.9925×10 -7 +1.1579×10 -7
15 +0.1967 +5.0256×10 -5 +6.1634×10 -6 +2.2998×10 -6 -1.2189×10 -7
21 +0.6898 +3.7981×10 -4 +7.2724×10 -6 -9.6564×10 -8 -5.0538×10 -9
[variable interval]
The wide-angle side intermediate focus is apart from telescope end
f 4.7600 10.8950 16.8300
d8 1.2203 6.3686 8.2935
d13 8.1217 2.9734 1.0485
d19 6.7033 3.1869 1.1000
d24 5.8354 9.3517 11.4386
Bf 0.6000 0.6000 0.6000
[condition respective value]
nd1＝1.94594
nd2＝1.94594
νd1＝17.98
νd2＝17.98
L1＝5.500
Lp＝10.000
fw＝4.76000
f1＝14.09358
f2＝-6.74689
ndp＝1.83400
Conditional (1) nd1=1.94594
Conditional (2) nd2=1.94594
Conditional (3) nd1/nd2=1.000
Conditional (4) ν d1=17.98
Conditional (5) ν d2=17.98
Conditional (6) ν d1/ ν d2=1.000
Conditional (7) L1/Lp=0.550
Conditional (8) f1/ (f2)=2.089
Conditional (9) (f2)/fw=1.417
Conditional (10) ndp=1.83400
Thereby in the present embodiment, can know and all satisfy above-mentioned conditional (1)～(10).In addition, with respect to Lp=10.000, L1=5.500, L1 can be more medium and small than prior art.
Figure 13～Figure 15 is expression and d line (each aberration diagram of the 3rd corresponding embodiment of λ=587.6nm).Promptly; Figure 13 is each aberration diagram under the focus for infinity state in the wide-angle side state (f=4.76mm); Figure 14 is each aberration diagram under the focus for infinity state in the intermediate focus state (f=10.90mm), and Figure 15 is each aberration diagram under the focus for infinity state in the telescope end state (f=16.83mm).And, can know from each aberration diagram, proofreaied and correct each aberration well under each the focal length state in the 3rd embodiment till from the wide-angle side state to the telescope end state, have excellent imaging performance.
The 4th embodiment
Following with reference to Figure 16～Figure 19 and table 4 explanation the 4th embodiment of the present invention.Figure 16 is the figure of formation of the zoom lens of expression the 4th embodiment.In addition, the zoom lens of the 4th embodiment are except the formation of the 2nd lens combination, and are identical with the formation of the zoom lens of the 1st embodiment, to each standard laid down by the ministries or commissions of the Central Government with the label identical with the 1st embodiment to omit detailed explanation.In addition, the 2nd lens combination G2 of the 4th embodiment comprises and being arranged in order from object side: stick together the negative compound lens L22 that forms at the negative lens L21 that has aspheric concave-concave shape as side and with the negative lens of concave-concave shape and the positive lens of biconvex shape.
Each parameter among below table 4 expressions the 4th embodiment.In addition, the numbering 1～28 of the face in the table 4 is corresponding to the face among Figure 16 1～28.In addition, in the 4th embodiment, each lens face of the 7th, the 10th, the 14th and the 21st forms aspherical shape.
(table 4)
[univers parameter]
The wide-angle side intermediate focus is apart from telescope end
f＝4.76 ～ 10.83 ～ 16.83
F.NO＝3.69 ～ 4.63 ～ 5.63
2ω＝80.12 ～ 37.46 ～ 24.50
[lens parameter]
Face numbering radius-of-curvature face is the refractive index Abbe number at interval
1 24.0157 0.80 1.94594 17.98
2 8.8935 1.93
3 212986 0.80 2.00069 25.46
4 16.1029 1.50
5 0.0000 9.60 1.88300 40.76
6 0.0000 0.30
7 * 19.6885 2.55 1.77377 47.17
8 -16.7162 (d8)
9 -71.9418 0.80 1.85135 40.10
10 * 9.2063 1.22
11 -14.8404 0.80 1.81600 46.62
12 10.8518 1.31 1.94594 17.98
13 -67.4208 (d13)
14 * 5.9953 1.45 1.58913 61.25
15 -36.9608 0.50
16 0.0000 0.50 (aperture diaphragm S)
17 13.8168 1.85 1.64000 60.08
18 -4.0035 0.80 1.83481 42.71
19 8.2259 (d19)
20 11.9130 2.09 1.58913 61.25
21 * -11.2129 0.20
22 5.9451 2.05 1.49700 81.54
23 64.9268 0.80 1.84666 23.78
24 5.6786 (d24)
25 0.0000 0.55 1.54437 70.51
26 0.0000 0.40
27 0.0000 0.50 1.51633 64.14
28 0.0000 (Bf)
[aspherical surface data]
Face numbering K C4 C6 C8 C10
7 -3.6294 +1.6073×10 -5 -4.6863×10 -7 +4.0036×10 -9 -2.0969×10 -11
10 -9.0000 +1.5122×10 -3 -5.1954×10 -5 +1.0103×10 -6 +3.8507×10 -8
14 +0.4518 +1.7174×10 -4 +1.9840×10 -5 +1.6119×10 -8 +4.3659×10 -8
21 +6.5379 +8.9943×10 -4 +2.2966×10 -5 -4.2505×10 -7 +8.1325×10 -8
[variable interval]
The wide-angle side intermediate focus is apart from telescope end
f 4.7600 10.83441 6.8300
d8 12428 7.0385 9.0846
d13 8.8916 3.0958 1.0500
d19 6.9489 3.3971 1.1000
d24 5.5049 9.0566 11.3537
Bf 0.5998 0.5999 0.5998
[condition respective value]
nd1＝1.94594
nd2＝2.00069
νd1＝17.98
νd2＝25.46
L1＝5.034
Lp＝9.600
fw＝4.75998
f1＝15.92586
f2＝-7.44907
ndp＝1.88300
Conditional (1) nd1=1.94594
Conditional (2) nd2=2.00069
Conditional (3) nd1/nd2=0.973
Conditional (4) ν d1=17.98
Conditional (5) ν d2=25.46
Conditional (6) ν d1/ ν d2=0.706
Conditional (7) L1/Lp=0.524
Conditional (8) f1/ (f2)=2.138
Conditional (9) (f2)/fw=1.565
Conditional (10) ndp=1.88300
Thereby in the present embodiment, can know and all satisfy above-mentioned conditional (1)～(10).In addition, with respect to Lp=9.600, L1=5.034, L1 can be more medium and small than prior art.
Figure 17～Figure 19 is expression and d line (each aberration diagram of the 4th corresponding embodiment of λ=587.6nm).Promptly; Figure 17 is each aberration diagram under the focus for infinity state in the wide-angle side state (f=4.76mm); Figure 18 is each aberration diagram under the focus for infinity state in the intermediate focus state (f=10.83mm), and Figure 19 is each aberration diagram under the focus for infinity state in the telescope end state (f=16.83mm).And, can know from each aberration diagram, proofreaied and correct each aberration well under each the focal length state in the 4th embodiment till from the wide-angle side state to the telescope end state, have excellent imaging performance.
The 5th embodiment
Following with reference to Figure 20～Figure 23 and table 5 explanation the 5th embodiment of the present invention.Figure 20 is the figure of formation of the zoom lens of expression the 5th embodiment.In addition, the zoom lens of the 5th embodiment are except the formation of the 2nd lens combination and the 4th lens combination, and are identical with the formation of the zoom lens of the 1st embodiment, to each standard laid down by the ministries or commissions of the Central Government with the label identical with the 1st embodiment to omit detailed explanation.In addition, the 2nd lens combination G2 of the 5th embodiment comprises and being arranged in order from object side: stick together the negative compound lens L22 that forms at the negative lens L21 that has aspheric concave-concave shape as side and with the negative lens of concave-concave shape and the positive lens of biconvex shape.The 4th lens combination G4 of the 5th embodiment comprises and being arranged in order from object side: stick together the negative compound lens L42 that forms at the positive lens L41 that has aspheric biconvex shape as side and with the positive lens of biconvex shape and the negative lens of concave-concave shape.
Each parameter among below table 5 expressions the 5th embodiment.In addition, the numbering 1～28 of the face in the table 5 is corresponding to the face among Figure 20 1～28.In addition, in the 5th embodiment, each lens face of the 7th, the 10th, the 14th and the 21st forms aspherical shape.
(table 5)
[univers parameter]
The wide-angle side intermediate focus is apart from telescope end
f＝4.76 ～ 10.83 ～ 19.20
F.NO＝3.47 ～ 4.34 ～ 5.75
2ω＝80.20 ～ 37.30 ～ 21.54
[lens parameter]
Face numbering radius-of-curvature face is the refractive index Abbe number at interval
1 17.2732 0.80 1.94594 17.98
2 8.3539 2.29
3 22.2424 0.80 2.00069 25.46
4 14.8265 1.60
5 0.0000 8.80 1.88300 40.76
6 0.0000 0.30
7 * 19.9314 2.56 1.76802 49.24
8 -16.2242 (d8)
9 -21.2094 0.80 1.85135 40.10
10 * 9.8366 1.00
11 -34.3738 0.80 1.83481 42.71
12 7.9969 1.47 1.94594 17.98
13 -1158.0055 (d13)
14 * 6.6673 1.51 1.59201 67.05
15 -28.2642 0.50
16 0.0000 0.50 (aperture diaphragm S)
17 11.6221 1.85 1.64000 60.08
18 -4.6955 0.80 1.88300 40.76
19 8.8567 (d19)
20 9.5123 2.50 1.59201 67.05
21 * -12.9644 0.20
22 7.1445 2.15 1.49700 81.54
23 -85.6130 0.80 1.79504 28.54
24 5.8608 (d24)
25 0.0000 0.60 1.54437 70.51
26 0.0000 0.40
27 0.0000 0.50 1.51633 64.14
28 0.0000 (Bf)
[aspherical surface data]
Face numbering K C4 C6 C8 C10
7 -7.6332 +8.1356×10 -5 -1.1855×10 -6 +1.0910×10 -8 -6.9554×10 -11
10 -9.0000 +1.1174×10 -3 -4.2945×10 -5 +1.3369×10 -6 -3.3511×10 -9
14 +0.4936 +1.6354×10 -4 +5.3401×10 -6 +9.8630×10 -7 -2.7231×10 -8
21 +2.0477 +5.2136×10 -4 +6.2688×10 -7 +2.6776×10 -7 -1.2539×10 -8
[variable interval]
The wide-angle side intermediate focus is apart from telescope end
f 4.7600 10.8344 19.2000
d8 1.2308 7.1168 9.5209
d13 9.3400 3.4541 1.0500
d19 8.5106 4.5925 1.1000
d24 5.2744 9.1924 12.6849
Bf 0.5999 0.6000 0.6000
[condition respective value]
nd1＝1.94594
nd2＝2.000694
νd1＝17.98
νd2＝25.46
L1＝5.498
Lp＝8.800
fw＝4.75999
f1＝16.35427
f2＝-7.24275
ndp＝1.88300
Conditional (1) nd1=1.94594
Conditional (2) nd2=2.000694
Conditional (3) nd1/nd2=0.973
Conditional (4) ν d1=17.98
Conditional (5) ν d2=25.46
Conditional (6) ν d1/ ν d2=0.706
Conditional (7) L1/Lp=0.625
Conditional (8) f1/ (f2)=2.258
Conditional (9) (f2)/fw=1.522
Conditional (10) ndp=1.88300
Thereby in the present embodiment, can know and all satisfy above-mentioned conditional (1)～(10).In addition, with respect to Lp=8.800, L1=5.498, L1 can be more medium and small than prior art.
Figure 21～Figure 23 is expression and d line (each aberration diagram of the 5th corresponding embodiment of λ=587.6nm).Promptly; Figure 21 is each aberration diagram under the focus for infinity state in the wide-angle side state (f=4.76mm); Figure 22 is each aberration diagram under the focus for infinity state in the intermediate focus state (f=10.83mm), and Figure 23 is each aberration diagram under the focus for infinity state in the telescope end state (f=19.20mm).And, can know from each aberration diagram, proofreaied and correct each aberration well under each the focal length state in the 5th embodiment till from the wide-angle side state to the telescope end state, have excellent imaging performance.
In addition, in above-mentioned each embodiment, in the scope of not decreasing optical property, can suitably adopt the following stated content.
In above-mentioned each embodiment, represented 4 groups of formations as zoom lens, also constitute applicable to other groups such as 2 groups, 3 groups, 5 groups.In addition, can between each lens combination, add the other lenses group, also can with zoom-lens system as side or the adjacent other lenses group of adding of object side.
And, also can be with single or a plurality of lens combination or part lens combination as the focus lens group that on optical axis direction, moves and focus on from the infinity object to closer object.This focus lens group is also applicable to automatic focus, or is applicable to (supersonic motor etc.) motor-driven that automatic focus is used.Particularly, 4 groups when constituting preferably with the 2nd or the 4th lens combination as focus lens group.
And, also can be with lens combination or part lens combination as vibration on the direction vertical with optical axis to proofread and correct the vibration-proof lens group of the flating that causes because of the hand shake.Particularly, preferably with the 3rd lens combination as the vibration-proof lens group, but also can be the 2nd lens combination.
And each lens face is aspheric surface also.At this moment, also the aspheric surface of attrition process, with glass with mould form aspherical shape the glass mould aspheric surface, with resin aspheric surface shape be formed on compound aspheric any one aspheric surface of glass surface.
And the aperture diaphragm preferred disposition also can not be provided with the parts as aperture diaphragm near the 3rd lens combination (lens combination that comprises the shift lens group) or in the 3rd lens combination, and uses lens frame with for it.
And each lens face is provided with the antireflection film that has high permeability in broadband, can alleviate glitter, afterimage, realize the optical property of high-contrast.
In addition, in order to make easy to understand of the present invention, be illustrated with reference to the inscape of embodiment, but the present invention is not limited by it.

Claims (23)

1. zoom lens have a plurality of lens combination that are arranged in order along optical axis from object side, it is characterized in that,
Have positive refractive power in the 1st lens combination of arranging in above-mentioned a plurality of lens combination near object side, and have the crooked light path bender element of the light path of making, and at a plurality of lens compositions of the object side configuration of above-mentioned light path bender element,
Above-mentioned a plurality of lens composition comprises a refractive index to the d line at least and surpasses 1.90 negative lens,
When near the negative lens of object side the refractive index of d line being made as nd1 in above-mentioned a plurality of lens compositions; Satisfy the condition of formula nd1＞1.90; And with in above-mentioned a plurality of lens compositions when the refractive index of d line being made as nd2 as the negative lens of side, satisfy the condition of formula nd2＞1.90.
2. zoom lens according to claim 1 is characterized in that,
Above-mentioned a plurality of lens composition is 2 lens.
3. zoom lens according to claim 1 is characterized in that,
With near the negative lens of object side the refractive index of d line being made as in nd1, the above-mentioned a plurality of lens compositions when as the negative lens of side the refractive index of d line being made as nd2 in above-mentioned a plurality of lens compositions, satisfy the condition of formula 0.7＜nd1/nd2＜1.1.
4. zoom lens according to claim 1 is characterized in that,
When near the negative lens of object side the Abbe number of d line being made as vd1 in above-mentioned a plurality of lens compositions; Satisfy the condition of formula vd1＜50; And with in above-mentioned a plurality of lens compositions when the Abbe number of d line being made as vd2 as the negative lens of side, satisfy the condition of formula vd2＜50.
5. zoom lens according to claim 1 is characterized in that,
With near the negative lens of object side the Abbe number of d line being made as in vd1, the above-mentioned a plurality of lens compositions when as the negative lens of side the Abbe number of d line being made as vd2 in above-mentioned a plurality of lens compositions, satisfy the condition of formula 0.4＜vd1/vd2＜1.3.
6. zoom lens according to claim 1 is characterized in that,
Above-mentioned light path bender element is a prism,
Will be from above-mentioned the 1st lens combination be made as L1 in the distance on the optical axis till the above-mentioned prism, when the distance of above-mentioned prism on optical axis is made as Lp, satisfy the condition of formula L1/Lp＜1.0 near the face of object side.
7. zoom lens according to claim 1 is characterized in that,
The focal length of above-mentioned the 1st lens combination is made as in f1, the above-mentioned a plurality of lens combination when the focal length of the 2nd lens combination of arranging as side of above-mentioned the 1st lens combination is made as f2, satisfies formula 1.9＜f1/ (condition f2)＜2.5.
8. zoom lens according to claim 1 is characterized in that,
The 2nd lens combination of arranging as side in above-mentioned the 1st lens combination in above-mentioned a plurality of lens combination has negative refractive index,
When the focal length that the focal length that the lens combination under the wide-angle side state is whole is made as fw, above-mentioned the 2nd lens combination is made as f2, satisfy formula 1.2＜(f2)/condition of fw＜1.8.
9. zoom lens according to claim 1 is characterized in that,
Above-mentioned light path bender element is a prism,
When above-mentioned prism is made as ndp to the refractive index of d line, satisfy the condition of formula ndp＞1.80.
10. zoom lens according to claim 1 is characterized in that,
Above-mentioned a plurality of lens combination comprises above-mentioned the 1st lens combination, the 2nd lens combination, the 3rd lens combination and the 4th lens combination that is arranged in order along optical axis from object side.
11. zoom lens according to claim 10 is characterized in that,
Above-mentioned the 2nd lens combination has negative refractive power, and above-mentioned the 3rd lens combination has positive refractive power, and above-mentioned the 4th lens combination has positive refractive power.
12. zoom lens according to claim 10 is characterized in that,
Above-mentioned the 1st lens combination and above-mentioned the 3rd lens combination are being fixed during to the telescope end zoom from wide-angle side,
Above-mentioned the 2nd lens combination and above-mentioned the 4th lens combination move along optical axis during to the telescope end zoom from wide-angle side above-mentioned.
13. zoom lens according to claim 1 is characterized in that,
Above-mentioned a plurality of lens composition has the negative concave-convex lens of convex surface towards object side.
14. zoom lens according to claim 1 is characterized in that,
Above-mentioned the 1st lens combination has the positive lens in the picture side configuration of above-mentioned light path bender element.
15. zoom lens according to claim 1 is characterized in that,
Above-mentioned the 1st lens combination has aspheric lens composition.
16. zoom lens according to claim 1 is characterized in that,
Visual angle under the wide-angle side state is more than 75 degree.
17. an optical device has the zoom lens that the picture that makes object forms images on predetermined face, it is characterized in that,
Above-mentioned zoom lens are the described zoom lens of claim 1.
18. a formation method, the picture that utilizes zoom lens to make object forms images on predetermined face, and these zoom lens have a plurality of lens combination that are arranged in order along optical axis from object side, and above-mentioned formation method is characterised in that,
Make the 1st lens combination of arranging near object side in above-mentioned a plurality of lens combination have positive refractive power,
The light path bender element that makes light path crooked is set in above-mentioned the 1st lens combination, and disposes a plurality of lens compositions at the object side of above-mentioned light path bender element,
Make above-mentioned a plurality of lens composition comprise a refractive index at least and surpass 1.90 negative lens the d line,
When near the negative lens of object side the refractive index of d line being made as nd1 in above-mentioned a plurality of lens compositions; Satisfy the condition of formula nd1＞1.90; And with in above-mentioned a plurality of lens compositions when the refractive index of d line being made as nd2 as the negative lens of side, satisfy the condition of formula nd2＞1.90.
19. formation method according to claim 18 is characterized in that,
Above-mentioned a plurality of lens composition is 2 lens.
20. formation method according to claim 18 is characterized in that,
With near the negative lens of object side the refractive index of d line being made as in nd1, the above-mentioned a plurality of lens compositions when as the negative lens of side the refractive index of d line being made as nd2 in above-mentioned a plurality of lens compositions, satisfy the condition of formula 0.7＜nd1/nd2＜1.1.
21. formation method according to claim 18 is characterized in that,
When near the negative lens of object side the Abbe number of d line being made as vd1 in above-mentioned a plurality of lens compositions; Satisfy the condition of formula vd1＜50; And with in above-mentioned a plurality of lens compositions when the Abbe number of d line being made as vd2 as the negative lens of side, satisfy the condition of formula vd2＜50.
22. formation method according to claim 18 is characterized in that,
With near the negative lens of object side the Abbe number of d line being made as in vd1, the above-mentioned a plurality of lens compositions when as the negative lens of side the Abbe number of d line being made as vd2 in above-mentioned a plurality of lens compositions, satisfy the condition of formula 0.4＜vd1/vd2＜1.3.
23. formation method according to claim 18 is characterized in that,
Above-mentioned a plurality of lens composition has the negative concave-convex lens of convex surface towards object side.
CN2008100852612A 2007-03-09 2008-03-10 Zoom lens, optical apparatus, and imaging method Expired - Fee Related CN101271189B (en)

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