CN102645726A - Prime lens - Google Patents
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- CN102645726A CN102645726A CN2011103865334A CN201110386533A CN102645726A CN 102645726 A CN102645726 A CN 102645726A CN 2011103865334 A CN2011103865334 A CN 2011103865334A CN 201110386533 A CN201110386533 A CN 201110386533A CN 102645726 A CN102645726 A CN 102645726A
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Abstract
The invention provides an internally focusing prime lens. The prime lens has the characteristics of small size, lightness, wide angle and excellent imaging performances. The prime lens in the invention comprises a first lens group (G11) having negative power; a second lens group (G12) having negative power; and a third lens group (G13) having positive power. The lens groups are sequentially configured from the object side. The second lens group (G12) is composed of lens elements of monomers. Meanwhile, during a focusing process, the second lens group (G12) moves along the optical axis while the first lens group (G11) and the third lens group (G13) are fixed relative to an imaging face (IMG).
Description
Technical field
The present invention relates to be suitable for the tight shot of 35mm camera, video camera, electronic still camera etc.
Background technology
In Single-sens reflex camera, consistent with viewfmder image in order to make photographic images, just have following mechanism: it makes light through lens for shooting by the mirror reflects of the front that places film, and this light is guided to optical finder.Therefore, be used for the tight shot of Single-sens reflex camera, needing very long rear cut-off distance, degree of freedom in design is restricted.On the other hand, in digital camera, only the image that imaging apparatus captured is presented on the electronic viewfinder, just can realizes and the equal effect of existing Single-sens reflex camera.Therefore, guide the reflective mirror of photographic images through the omission optical finder with to it, thus the what is called of the miniaturization of implement device " reflector-free interchangeable lenses camera " listing.In reflector-free interchangeable lenses camera,, also improve such advantage so have the design freedom of its employed tight shot because can shorten the rear cut-off distance of lens for shooting.The tight shot that therefore, can be equipped on the reflector-free interchangeable lenses camera also must become more and more (for example with reference to patent documentation 1,2.)。
[look-ahead technique document]
[patent documentation]
[patent documentation 1] patent 2009-271354 communique
No. 3445554 communique of [patent documentation 2] patent
With regard to patent documentation 1 disclosed optical system, though can realize on focusing crowd's this point oversimplifying being made up of a slice negative lens, the lens number is many in the formation of the lens group beyond the focusing crowd, can't realize simplification.In addition, draw that the angle is also narrow to be reached about 6 degree, first lens group has positive light coke, so optical system has the elongated tendency of length overall, and miniaturization fully is far from being and is implemented.From above reason, patent documentation 1 disclosed optical system is not suitable for requiring in recent years reflector-free interchangeable lenses camera further small-sized, wide-angleization.
In addition, with regard to patent documentation 2 disclosed optical systems,, we can say the simplification that has realized structure constituting by a slice negative lens on this point that focusing crowd and the lens beyond the focusing crowd also are made up of less lens.But the picture angle is narrow to be reached about 25 degree.In addition, because first lens group has positive light coke, so the optical system length overall has elongated tendency.According to more than, patent documentation 2 disclosed optical systems also be not suitable for desired in recent years further small-sized, wide-angleization reflector-free interchangeable lenses camera.
So, in the existing tight shot headed by the described technology of above-mentioned each patent documentation, not talkatively reached sufficient small-sized, wide-angleization.
Summary of the invention
Among the present invention, in order to eliminate above-mentioned prior art problems point, the tight shot that its purpose is to provide a kind of small-sized, light weight, wide-angle and has the interior focusing mode of excellent imaging performance.
In order to solve above-mentioned problem and to reach purpose, tight shot of the present invention is characterized in that, has the following lens group that disposes in order from object side: first lens group with negative power; Second lens group with negative power; The 3rd lens group with positive light coke, and said second lens group is made up of the lens element of monomer, when focusing, said second lens group moves along optical axis, and said first lens group and said the 3rd lens group are fixed with respect to imaging surface.
According to the present invention, the tight shot of the excellent interior focusing mode of a kind of small-sized, light weight, wide-angle and imaging performance can be provided.
In addition, tight shot of the present invention, according to said invention, wherein, aperture diaphragm is configured between said second lens group and said the 3rd lens group.
According to the present invention, the tight shot of the interior focusing mode of light weight, imaging performance excellence can be provided.
In addition, tight shot of the present invention, according to said invention, wherein, the conditional below satisfying.
(1)-3.5≤(R1+R2)/(R1-R2)≤1
Wherein, R1 representes the radius-of-curvature of leaning on most the object side one side of said second lens group, and what R2 represented said second lens group leans on picture side radius-of-curvature simultaneously most.
According to the present invention, can not hinder the miniaturization of optical system, imaging performance is improved.
In addition, tight shot of the present invention, according to said invention, wherein, the conditional below satisfying.
(2)0.7≤|(1-β2G)×β3G|≤2.5
Wherein, β 2G is illustrated in the paraxial imagery multiplying power that infinity closes said second lens group under the burnt state, and β 3G is illustrated in the paraxial imagery multiplying power that infinity closes said the 3rd lens group under the burnt state.
According to the present invention, can not hinder the miniaturization of optical system, imaging performance is improved.
In addition, tight shot of the present invention, according to said invention, wherein, the conditional below satisfying.
(3)1.5≤|F1/F|≤4.1
Wherein, F1 representes the focal length of said first lens group, and F representes the system-wide focal length of optical system.
According to the present invention,, can realize simple, small-sized tight shot keeping under the state of high optical property.
The effect that is played according to the present invention is, the tight shot that small-sized, light weight, wide-angle can be provided and have the interior focusing mode of excellent imaging performance.
Description of drawings
Fig. 1 is the sectional view along optical axis of structure of the tight shot of expression embodiment 1.
Fig. 2 is all aberration diagrams that the infinity of the tight shot of embodiment 1 closes burnt state.
Fig. 3 is 0.025 times of all aberration diagram that close burnt state of shooting multiplying power of the tight shot of embodiment 1.
Fig. 4 is all aberration diagrams that the minimum distance of the tight shot of embodiment 1 closes burnt state.
Fig. 5 is the sectional view along optical axis of structure of the tight shot of expression embodiment 2.
Fig. 6 is all aberration diagrams that the infinity of the tight shot of embodiment 2 closes burnt state.
Fig. 7 is 0.025 times of all aberration diagram that close burnt state of shooting multiplying power of the tight shot of embodiment 2.
Fig. 8 is all aberration diagrams that the minimum distance of the tight shot of embodiment 2 closes burnt state.
Fig. 9 is the sectional view along optical axis of structure of the tight shot of expression embodiment 3.
Figure 10 is all aberration diagrams that the infinity of the tight shot of embodiment 3 closes burnt state.
Figure 11 is 0.025 times of all aberration diagram that close burnt state of shooting multiplying power of the tight shot of embodiment 3.
Figure 12 is all aberration diagrams that the minimum distance of the tight shot of embodiment 3 closes burnt state.
Symbol description:
G
11, G
21, G
31First lens group
G
12, G
22, G
32Second lens group
G
13, G
23, G
33The 3rd lens group
L
111, L
121, L
132, L
134, L
211, L
221, L
232, L
234, L
311, L
321, L
332, L
334Negative lens
L
112, L
131, L
133, L
212, L
231, L
233, L
312, L
331, L
333Positive lens
The IMG imaging surface
The ST aperture diaphragm
Embodiment
Below, tight shot of the present invention at length is described preferred embodiment.
Tight shot of the present invention comprises the following lens group that disposes in order from object side and is configured: first lens group with negative power; Second lens group with negative power; The 3rd lens group with positive light coke.
Said first lens group contains 1 negative lens and 1 positive lens at least and is configured.As described above, because said first lens group has negative power, exist deceiving of downside (ア Application ダ one side) generation so in said first lens group, particularly distort big.Distortion in this generation can be by said the 3rd lens group correction.But if make said the 3rd lens group exceedingly have this correcting action, then the 3rd lens group makes spherical aberration take place significantly at downside, thereby is not preferred.Therefore, more preferably on the lens that constitute said first lens group, form aspheric surface, the distortion that takes place at this first lens group is revised by this aspheric surface effect.Also have, said first lens group is fixed with respect to shooting face.
With regard to said second lens group, preferably the lens element by monomer constitutes.In tight shot of the present invention, moving on the direction of optical axis through making said second lens group, thereby focusing.Therefore, constitute by the lens element of monomer and make it lightweight, just can reduce the load of autofocus mechanism, can realize the downsizing of low power consumption, lens barrel external diameter as focusing crowd's said second lens group.Also have, the lens element of so-called monomer comprises single grinding lens, non-spherical lens, compound non-spherical lens and engages lens, does not include air layer and each other not by bonding two for example positive and negative lens etc.
In addition, in tight shot of the present invention, why making said second lens group as the focusing crowd, is because light is the thinnest near said second lens group configuration and in the optical system, can make as the bore of said second lens group that passes through the focusing crowd minimum.That is, like the present invention, when type realized comparing the optical system of wide-angle (about 70～80 degree) in advance by negative group, F value light attenuated through said first lens group on the axle, towards the chap as side.On the other hand, off-axis ray, passes through with respect to the optical axis extreme lower position near said second lens group through the part high with respect to optical axis at said first lens group.From the characteristic of such axle glazed thread, off-axis ray, we can say said second lens group configuration near be exactly the thinnest part of light in the optical system.Therefore, the bore that the part that light is the thinnest in optical system disposes said second lens group just can be minimum in optical system, can promote the lightweight of optical system.
With regard to said the 3rd lens group, be fixed with respect to imaging surface.Removable do not hinder yet can, but just preferably fix because of the outside entering of for example pointing etc. destroys the lens maintaining body from lens barrel in order to prevent.
In addition, in fix-focus lens of the present invention, preferably between said second lens group and said the 3rd lens group, dispose aperture diaphragm.Through so, before and after it, positive negative power is suitably disperseed at a distance from aperture diaphragm at folder, carry out the correction of all aberrations easily.More lean on object side as if aperture diaphragm being configured in than said second lens group, then the emergent pupil position deepens (too near the picture side), therefore has to increase the bore of said the 3rd lens group.If aperture of lens enlarges, then lens weight also increases, and is not preferred therefore.
Through having above such characteristic, can realize the tight shot of small-sized, light weight, wide-angle.
In addition, in the present invention, in order to realize having the tight shot of better imaging performance, except above-mentioned characteristic, the various conditions shown in below also setting.
At first, in tight shot of the present invention, the radius-of-curvature of leaning on most the object side one side of said second lens group is made as R1, second lens group lean on radius-of-curvature as the side one side to be made as R2 most the time, preferably satisfy the following conditions formula.
(1)-3.5≤(R1+R2)/(R1-R2)≤1
Conditional (1) has been stipulated the shape of second lens group.Optical system of the present invention through the formula of satisfying condition (1), can be kept good imaging performance.If in conditional (1), be lower than its lower limit, a little less than the negative power of then said second lens group became, the path increment of said second lens group when focusing increased, and as a result of was that the optical system length overall prolongs, and was not preferred therefore.On the other hand, if in conditional (1), surpass its upper limit, the radius-of-curvature of the object side of then said second lens group is excessive, the correction difficulty of distortion, and curvature of the image is excessive at downside, is not preferred therefore.
Also have, if above-mentioned conditional (1) satisfy below shown in scope, then can expect preferred effect.
(1)’-3.0≤(R1+R2)/(R1-R2)≤0.5
Through satisfying this conditional (1) ' scope of defined, can either reach the further shorteningization of optical system length overall, can realize the further raising of imaging performance again.
In addition, if above-mentioned conditional (1) ' satisfy below shown in scope, then can expect further preferred effect.
(1)”-2.5≤(R1+R2)/(R1-R2)≤-0.1
Through satisfying this conditional (1) " scope of defined, can either reach the further shorteningization of optical system length overall, can realize the further raising of imaging performance again.
In addition; In tight shot of the present invention; The paraxial imagery multiplying power of closing said second lens group under the burnt state at infinity is made as β 2G, and when the paraxial imagery multiplying power of closing said the 3rd lens group under the burnt state at infinity was made as β 3G, formula preferably met the following conditions.
(2)0.7≤|(1-β2G)×β3G|≤2.5
Conditional (2) has been stipulated the focusing susceptibility of optical system, and decision is closed the path increment that burnt state to minimum distance closes the focusing crowd till the burnt state from infinity.Said focusing susceptibility is expressed as the ratio of the amount of movement of the focusing position on the image planes with respect to focusing crowd's amount of movement.By the value of this conditional (2) regulation, be the size of decision optical system, the important key element of imaging performance.In conditional (2), if be lower than its lower limit, then when the minimum distance of guaranteeing to expect closes burnt state, increase as the path increment of focusing crowd's said second lens group, the expansion of optical system length overall is inevitable, is not preferred.On the other hand, in conditional (2), if surpass its upper limit, then not only curvature of the image is excessive at upside (オ one バ one side), and spherical aberration is also excessive at upside, causes the deterioration of imaging performance, is not preferred therefore.
Also have, if above-mentioned conditional (2) satisfy below shown in scope, then can expect preferred effect.
(2)’0.6＜|(1-β2G)×β3G|＜2.3
Through satisfying this conditional (2) ' scope of defined, can either reach the further shorteningization of optical system length overall, can realize the further raising of imaging performance again.
In addition, if above-mentioned conditional (2) ' satisfy below shown in scope, then can expect further preferred effect.
(2)”0.5＜|(1-β2G)×β3G|＜2.1
Through satisfying this conditional (2) " scope of defined, can either reach the further shorteningization of optical system length overall, can realize the further raising of imaging performance again.
In addition, in tight shot of the present invention, the focal length of said first lens group is made as F1, and when the system-wide focal length of optical system was made as F, formula preferably met the following conditions.
(3)1.5≤|F1/F|≤4.1
The focal length of said first lens group of conditional (3) regulation is with respect to the ratio of optical system length overall.The focal length of said first lens group directly impacts the optical system length overall.Optical system of the present invention through the formula of satisfying condition (3), under the state of keeping good imaging performance, can shorten the optical system length overall.In conditional (3), if be lower than its lower limit, the later imaging multiplying power of then said second lens group will be amplified needs to produce, and is embodied as as well behaved optical system with seldom lens arrangement and just has any problem.On the other hand, in conditional (3), if surpass its upper limit, then the optical system length overall is long, can not reach the miniaturization of the desired optical system in market.
Also have, if above-mentioned conditional (3) satisfy below shown in scope, then can expect more excellent effect.
(3)’1.4≤|F1/F|≤4.0
Through satisfying this conditional (3) ' regulation scope, can not hinder the miniaturization of optical system, and can access better imaging performance.
In addition, if above-mentioned conditional (3) ' satisfy below shown in scope, then can expect further excellent effect.
(3)”1.3≤|F1/F|≤3.9
Through satisfying this conditional (3) " regulation scope, can not hinder the miniaturization of optical system, and can realize the further raising of imaging performance.
As described above, according to the present invention, can realize the tight shot of the interior focusing mode that small-sized, light weight, wide-angle and imaging performance are excellent.Particularly aperture diaphragm is configured between said second lens group and said the 3rd lens group, just can press from both sides at a distance from aperture diaphragm before and after it, positive negative power suitably to be disperseed, and make the correction of all aberrations become easy.In addition, through satisfying above-mentioned each conditional, can realize tight shot more small-sized and that have the interior focusing formula of excellent imaging performance.
Below, the embodiment of tight shot of the present invention at length is described based on accompanying drawing.Also have, following embodiment does not limit the present invention.
[embodiment 1]
Fig. 1 is the sectional view along optical axis of structure of the tight shot of expression embodiment 1.It constitutes this tight shot, and never illustrated object side rises and disposes following lens group in order: the first lens group G with negative power
11The second lens group G with negative power
12The 3rd lens group G with positive light coke
13In addition, at the second lens group G
12With the 3rd lens group G
13Between, dispose the aperture diaphragm ST that has stipulated predetermined bore.
The first lens group G
11It constitutes, and disposes negative lens L in order from said object side
111, positive lens L
112At negative lens L
111Imaging surface IMG side simultaneously form aspheric surface.Also has the first lens group G
11Be fixed, when focusing, do not move.
With regard to the second lens group G
12, it is by negative lens L
121Constitute.Through the second lens group G
12Move from the said object side of imaging surface IMG side direction along optical axis, carry out closing the focusing till burnt state to minimum distance closes burnt state from infinity.
The 3rd lens group G
13It constitutes, and disposes positive lens L in order from said object side
131, negative lens L
132, positive lens L
133, negative lens L
134Positive lens L
131With negative lens L
132Be engaged.In addition, at positive lens L
131Said object side one side and negative lens L
134Imaging surface IMG side one side form aspheric surface respectively.The 3rd lens group G
13Also be fixed, when focusing, do not move.
Below, the various numeric datas about the tight shot of embodiment 1 are shown.
(lens data)
r
0=∞ (object plane)
d
0＝D(0)
r
1＝42.314
d
1＝1.100 nd
1＝1.81881 vd
1＝63.9
r
2=8.370 (aspheric surfaces)
d
2＝4.555
r
3＝13.531
d
3＝1.761 nd
2＝1.90366 vd
2＝31.3
r
4＝23.616
d
4＝D(4)
r
5＝-12.500
d
5＝0.800 nd
3＝1.49700 vd
3＝81.6
r
6＝-215.596
d
6＝D(6)
r
7=∞ (aperture diaphragm)
d
7＝1.100
r
8=20.299 (aspheric surfaces)
d
8＝4.833 nd
4＝1.49700 vd
4＝81.6
r
9＝-8.778
d
9＝0.800 nd
5＝1.67270 vd
5＝32.2
r
10＝-18.840
d
10＝0.300
r
11＝13.379
d
11＝3.741 nd
6＝1.48749 vd
6＝70.4
r
12＝-134.098
d
12＝5.836
r
13＝-27.220
d
13＝0.800 nd
7＝1.77250 vd
7＝49.6
r
14=-38.344 (aspheric surfaces)
d
14＝FB
r
15=∞ (imaging surface)
(circular cone coefficient (k) and asphericity coefficient (A
4, A
6, A
8, A
10))
(the 2nd face)
k＝0
A
4＝-8.09890×10
-5，A
6＝-2.92652×10
-6，
A
8＝4.36492×10
-8，A
10＝-9.92044×10
-10
(the 8th face)
k＝0
A
4＝7.71954×10
-6，A
6＝2.59802×10
-7，
A
8＝5.30322×10
-9，A
10＝-1.50109×10
-10
(the 14th face)
k＝0
A
4＝1.68091×10
-4，A
6＝8.18365×10
-7，
A
8＝7.01745×10
-9，A
10＝-3.48873×10
-11
(respectively closing the numeric data of burnt state)
The first lens group G
11Focal length (F1)-43.456
(about the numerical value of conditional (1))
The second lens group G
12The radius-of-curvature (R1)=-12.500 of leaning on most the object side one side
The second lens group G
12The radius-of-curvature (R2)=-215.596 of leaning on most imaging surface IMG side one side
(R1+R2)/(R1-R2)＝-1.12
(about the numerical value of conditional (2))
Close the second lens group G under the burnt state at infinity
12Paraxial imagery multiplying power (β 2G)=0.33
Close the 3rd lens group G under the burnt state at infinity
13Paraxial imagery multiplying power (β 3G)=-1.42
|(1-β2G)×β3G|＝1.0
(about the numerical value of conditional (3))
|F1/F|＝2.29
In addition, Fig. 2 is all aberration diagrams that the infinity of the tight shot of embodiment 1 closes burnt state.Fig. 3 is 0.025 times of all aberration diagram that close burnt state of shooting multiplying power of the tight shot of embodiment 1.Fig. 4 is all aberration diagrams that the minimum distance of the tight shot of embodiment 1 closes burnt state.Among the figure, g representes to be equivalent to the g line, and (aberration of the wavelength of λ=435.83nm), d represent to be equivalent to the d line (aberration of the wavelength of λ=587.56nm).And the s of astigmatism figure, m represent sagittal image surface, meridian (メ リ デ イ オ Na Le meridional) the pairing aberration of image planes respectively.
[embodiment 2]
Fig. 5 is the sectional view along optical axis of structure of the tight shot of expression embodiment 2.It constitutes this tight shot, and never illustrated object side rises and disposes following lens group in order: the first lens group G with negative power
21The second lens group G with negative power
22The 3rd lens group G with positive light coke
23In addition, at the second lens group G
22With the 3rd lens group G
23Between, dispose the aperture diaphragm ST that has stipulated predetermined bore.
The first lens group G
21It constitutes, and disposes negative lens L in order from said object side
211, positive lens L
212At negative lens L
211Imaging surface IMG side simultaneously form aspheric surface.Also has the first lens group G
21Be fixed, when focusing, do not move.
With regard to the second lens group G
22, it is by negative lens L
221Constitute.Through the second lens group G
22Move from the said object side of imaging surface IMG side direction along optical axis, carry out closing the focusing till burnt state to minimum distance closes burnt state from infinity.
The 3rd lens group G
23It constitutes, and disposes positive lens L in order from said object side
231, negative lens L
232, positive lens L
233, negative lens L
234Positive lens L
231With negative lens L
232Be engaged.In addition, at positive lens L
231Said object side one side and negative lens L
234Imaging surface IMG side one side form aspheric surface respectively.The 3rd lens group G
23Also be fixed, when focusing, do not move.
Below, the various numeric datas about the tight shot of embodiment 2 are shown.
(lens data)
r
0=∞ (object plane)
d
0＝D(0)
r
1＝60.565
d
1＝1.100 nd
1＝1.61881 vd
1＝63.9
r
2=8.914 (aspheric surfaces)
d
2＝5.053
r
3＝14.455
d
3＝1.803 nd
2＝1.90366 vd
2＝31.3
r
4＝25.530
d
4＝D(4)
r
5＝-13.100
d
5＝0.800 nd
3＝1.49700 vd
3＝81.6
r
6＝-128.373
d
6＝D(6)
r
7=∞ (aperture diaphragm)
d
7＝1.100
r
8=19.077 (aspheric surfaces)
d
8＝4.468 nd
4＝1.49700 vd
4＝81.6
r
9＝-9.794
d
9＝0.800 nd
5＝1.67270 vd
5＝32.2
r
10＝-22.731
d
10＝0.300
r
11＝13.295
d
11＝3.674 nd
6＝1.48749 vd
6＝70.4
r
12＝-111.586
d
12＝5.699
r
13＝-31.568
d
13＝0.800 nd
7＝1.77250 vd
7＝49.6
r
14=-52.153 (aspheric surfaces)
d
14＝FB
r
15=∞ (imaging surface)
(circular cone coefficient (k) and asphericity coefficient (A
4, A
6, A
8, A
10))
(the 2nd face)
k＝0
A
4＝-7.06503×10
-5，A
6＝-2.39334×10
-6，
A
8＝3.10569×10
-8，A
10＝-5.80198×10
-10
(the 8th face)
k＝0
A
4＝-7.02444×10
-6，A
6＝6.70051×10
-7，
A
8＝-1.82054×10
-8，A
10＝2.46248×10
-10
(the 14th face)
k＝0
A
4＝1.75449×10
-4，A
6＝1.10046×10
-6，
A
8＝1.92052×10
-9，A
10＝3.40618×10
-11
(respectively closing the numeric data of burnt state)
The first lens group G
21Focal length (F1)-45.81
(about the numerical value of conditional (1))
The second lens group G
22The radius-of-curvature (R1)=-13.100 of leaning on most the object side one side
The second lens group G
22The radius-of-curvature (R2)=-128.373 of leaning on most imaging surface IMG side one side
(R1+R2)/(R1-R2)＝-1.23
(about the numerical value of conditional (2))
Close the second lens group G under the burnt state at infinity
22Paraxial imagery multiplying power (β 2G)=0.33
Close the 3rd lens group G under the burnt state at infinity
23Paraxial imagery multiplying power (β 3G)=-1.42
|(1-β2G)×β3G|＝0.96
(about the numerical value of conditional (3))
|F1/F|＝2.17
In addition, Fig. 6 is all aberration diagrams that the infinity of the tight shot of embodiment 2 closes burnt state.Fig. 7 is 0.025 times of all aberration diagram that close burnt state of shooting multiplying power of the tight shot of embodiment 2.Fig. 8 is all aberration diagrams that the minimum distance of the tight shot of embodiment 2 closes burnt state.Among the figure, g representes to be equivalent to the g line, and (aberration of the wavelength of λ=435.83nm), d represent to be equivalent to the d line (aberration of the wavelength of λ=587.56nm).And the s of astigmatism figure, m represent sagittal image surface, the pairing aberration of meridianal image surface respectively.
[embodiment 3]
Fig. 9 is the sectional view along optical axis of structure of the tight shot of expression embodiment 3.It constitutes this tight shot, and never illustrated object side rises and disposes following lens group in order: the first lens group G with negative power
31The second lens group G with negative power
32The 3rd lens group G with positive light coke
33In addition, at the second lens group G
32With the 3rd lens group G
33Between, dispose the aperture diaphragm ST that has stipulated predetermined bore.
The first lens group G
31It constitutes, and disposes negative lens L in order from said object side
311, positive lens L
312At negative lens L
311Imaging surface IMG side simultaneously form aspheric surface.Also has the first lens group G
31Be fixed, when focusing, do not move.
With regard to the second lens group G
32, it is by negative lens L
321Constitute.Through the second lens group G
32Move from the said object side of imaging surface IMG side direction along optical axis, carry out closing the focusing till burnt state to minimum distance closes burnt state from infinity.
The 3rd lens group G
33It constitutes, and disposes positive lens L in order from said object side
331, negative lens L
332, positive lens L
333, negative lens L
334Positive lens L
331With negative lens L
332Be engaged.In addition, at positive lens L
331Said object side one side and negative lens L
334Imaging surface IMG side one side form aspheric surface respectively.The 3rd lens group G
33Also be fixed, when focusing, do not move.
Below, the various numeric datas about the tight shot of embodiment 3 are shown.
(lens data)
r
0=∞ (object plane)
d
0＝D(0)
r
1＝50.739
d
1＝1.100 nd
1＝1.72916 vd
1＝54.7
r
2=8.504 (aspheric surfaces)
d
2＝6.121
r
3＝29.528
d
3＝1.991 nd
2＝1.84666 vd
2＝23.8
r
4＝-16.700
d
4＝D(4)
r
5＝-17.281
d
5＝0.800 nd
3＝1.61800 vd
3＝63.4
r
6＝-1116.807
d
6＝D(6)
r
7=∞ (aperture diaphragm)
d
7＝1.100
r
8=22.865 (aspheric surfaces)
d
8＝3.844 nd
4＝1.49700 vd
4＝81.6
r
9＝-8.627
d
9＝0.800 nd
5＝1.64769 vd
5＝33.8
r
10＝-31.391
d
10＝1.160
r
11＝20.082
d
11＝3.308 nd
6＝1.49700 vd
6＝81.6
r
12＝-17.997
d
12＝8.061
r
13＝-16.701
d
13＝1.000 nd
7＝1.77250 vd
7＝49.6
r
14=-18.424 (aspheric surfaces)
d
14＝FB
r
15=∞ (imaging surface)
(circular cone coefficient (k) and asphericity coefficient (A
4, A
6, A
8, A
10))
(the 2nd face)
k＝0
A
4＝-7.50069×10
-5，A
6＝-4.43622×10
-6，
A
8＝7.95093×10
-8，A
10＝-1.17518×10
-9
(the 8th face)
k＝0
A
4＝-3.90349×10
-5，A
6＝4.97007×10
-7，
A
8＝-2.87913×10
-8，A
10＝2.46882×10
-10
(the 14th face)
k＝0
A
4＝1.34544×10
-4，A
6＝7.70023×10
-7，
A
8＝5.67370×10
-9，A
10＝-2.02389×10
-11
(respectively closing the numeric data of burnt state)
(about the numerical value of conditional (1))
The second lens group G
32The radius-of-curvature (R1)=-17.281 of leaning on most the object side one side
The second lens group G
32The radius-of-curvature (R2)=-1116.807 of leaning on most imaging surface IMG side one side
(R1+R2)/(R1-R2)＝-1.03
(about the numerical value of conditional (2))
Close the second lens group G under the burnt state at infinity
22Paraxial imagery multiplying power (β 2G)=0.27
Close the 3rd lens group G under the burnt state at infinity
23Paraxial imagery multiplying power (β 3G)=-1.18| (1-β 2G) * β 3G|=0.86
(about the numerical value of conditional (3))
|F1/F|＝3.11
In addition, Figure 10 is all aberration diagrams that the infinity of the tight shot of embodiment 3 closes burnt state.Figure 11 is 0.025 times of all aberration diagram that close burnt state of shooting multiplying power of the tight shot of embodiment 3.Figure 12 is all aberration diagrams that the minimum distance of the tight shot of embodiment 3 closes burnt state.Among the figure, g representes to be equivalent to the g line, and (aberration of the wavelength of λ=435.83nm), d represent to be equivalent to the d line (aberration of the wavelength of λ=587.56nm).And the s of astigmatism figure, m represent sagittal image surface, the pairing aberration of meridianal image surface respectively.
Also have, in the numeric data in above-mentioned each embodiment, r
1, r
2... The radius-of-curvature of representing each lens, diaphragm face etc.; d
1, d
2... Wall thickness or its face interval of representing each lens, diaphragm etc.; Nd
1, nd
2... Represent each lens to the d line (refractive index of λ=587.56nm); Vd
1, vd
2... Represent each lens to the d line (Abbe number of λ=587.56nm).And the unit of length all is " mm ", the unit of angle all be " ° ".
In addition, the aspheric degree of depth is made as Z, and curvature is made as c (=1/r:r is a radius-of-curvature), is made as h apart from the height of optical axis, and the direct of travel of light is made as correct time, and above-mentioned each aspherical shape is represented by the formula shown in following.
[formula 1]
Z＝ch
2/[1+{1-(1+k)c
2h
2}
1/2]+A
4h
4+A
6h
6+A
8h
8+A
10h
10
Wherein, k is the circular cone coefficient, A
4, A
6, A
8, A
10It is respectively 4 times, 6 times, 8 times, 10 times asphericity coefficient.
As described above, the tight shot of above-mentioned each embodiment is because be made up of lens number seldom, so can realize small-sized, light weight and wide-angleization.Particularly aperture diaphragm is configured between said second lens group and said the 3rd lens group, can press from both sides at a distance from aperture diaphragm before and after it, positive negative power suitably to be disperseed, and becomes easy with regard to the correction that makes all aberrations.In addition, through satisfying above-mentioned each conditional, can realize tight shot more small-sized and that have the interior focusing formula of excellent imaging performance.In addition, the tight shot of above-mentioned each embodiment is because used suitable aspheric lens and the joint lens of being formed with, so just can keep the good optical performance with lens number seldom.
[utilizability on the industry]
As above, tight shot of the present invention, useful at aspects such as 35mm camera, video camera, electronic still cameras, particularly be suitable for most the short so-called reflector-free interchangeable lenses camera of rear cut-off distance.
Claims (7)
1. a tight shot is characterized in that, has the following lens group that disposes in order from object side: first lens group with negative power; Second lens group with negative power; The 3rd lens group with positive light coke,
Said second lens group is made up of the lens element of monomer,
When focusing, said second lens group moves along optical axis, and said first lens group and said the 3rd lens group are fixed with respect to imaging surface.
2. tight shot according to claim 1 is characterized in that,
Aperture diaphragm is configured between said second lens group and said the 3rd lens group.
3. tight shot according to claim 1 is characterized in that,
Conditional below satisfying:
(1)-3.5≤(R1+R2)/(R1-R2)≤1
Wherein, R1 representes the radius-of-curvature of leaning on most the object side one side of said second lens group, and what R2 represented said second lens group leans on picture side radius-of-curvature simultaneously most.
4. tight shot according to claim 2 is characterized in that,
Conditional below satisfying:
(1)-3.5≤(R1+R2)/(R1-R2)≤1
Wherein, R1 representes the radius-of-curvature of leaning on most the object side one side of said second lens group, and what R2 represented said second lens group leans on picture side radius-of-curvature simultaneously most.
5. according to each described tight shot in the claim 1～4, it is characterized in that,
Conditional below satisfying:
(2)0.7≤|(1-β2G)×β3G|≤2.5
Wherein, β 2G is illustrated in the paraxial imagery multiplying power that infinity closes said second lens group under the burnt state, and β 3G is illustrated in the paraxial imagery multiplying power that infinity closes said the 3rd lens group under the burnt state.
6. according to each described tight shot in the claim 1～4, it is characterized in that,
Conditional below satisfying:
(3)1.5≤|F1/F|≤4.1
Wherein, F1 representes the focal length of said first lens group, and F representes the system-wide focal length of optical system.
7. tight shot according to claim 5 is characterized in that,
Conditional below satisfying:
(3)1.5≤|F1/F|≤4.1
Wherein, F1 representes the focal length of said first lens group, and F representes the system-wide focal length of optical system.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2011033958A JP2012173435A (en) | 2011-02-18 | 2011-02-18 | Fixed-focus lens |
| JP2011-033958 | 2011-02-18 |
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| Publication Number | Publication Date |
|---|---|
| CN102645726A true CN102645726A (en) | 2012-08-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011103865334A Pending CN102645726A (en) | 2011-02-18 | 2011-11-29 | Prime lens |
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|---|---|
| JP (1) | JP2012173435A (en) |
| CN (1) | CN102645726A (en) |
Cited By (1)
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|---|---|---|---|---|
| CN109788089A (en) * | 2018-10-16 | 2019-05-21 | 华为技术有限公司 | The method and terminal of microspur imaging |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6253012B2 (en) | 2012-12-27 | 2017-12-27 | パナソニックＩｐマネジメント株式会社 | Inner focus lens system, interchangeable lens device and camera system |
| JP6220601B2 (en) * | 2013-08-22 | 2017-10-25 | 株式会社タムロン | Inner focus lens and imaging device |
| US9753250B2 (en) | 2014-05-26 | 2017-09-05 | Olympus Corporation | Wide angle lens and image pickup apparatus using the same |
| JP2024003275A (en) * | 2020-11-11 | 2024-01-15 | コニカミノルタ株式会社 | Imaging optical system and imaging device |
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| JP5807166B2 (en) * | 2010-07-12 | 2015-11-10 | パナソニックＩｐマネジメント株式会社 | Zoom lens system, interchangeable lens device and camera system |
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|---|---|
| JP2012173435A (en) | 2012-09-10 |
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