CN102289057B - Zoom lens and imaging device - Google Patents
Zoom lens and imaging device Download PDFInfo
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- CN102289057B CN102289057B CN201110158542.8A CN201110158542A CN102289057B CN 102289057 B CN102289057 B CN 102289057B CN 201110158542 A CN201110158542 A CN 201110158542A CN 102289057 B CN102289057 B CN 102289057B
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Abstract
The invention provides a zoom lens with a high rate and a heavy caliber, and a large rear cut-off distance can be obtained with a small number of lenses. Wherein the object side is consequently provided with a positive first lens group which is fixed relative to the optical axis direction during the zooming, a negative second lens group which is moving during the zooming to change the rate, a positive third lens group which is fixed relative to the optical axis direction, and a positive fourth lens group which is moving during the zooming, modifying with the change of the image surface position and do focusing. In addition, the third lens group is composed of a positive first lens and a negative second lens with the concave surface facing the object side; the fourth lens group possesses a negative lens and more than two positive lenses; and in addition, the Abbe number with the d line as the reference is set as vd31, and the following conditional expression is satisfied: vd31 is more than 16 and less than 35.
Description
Technical field
The present invention relates to a kind of high magnification and the zoom lens of heavy caliber ratio and possess the camera head of this zoom lens.
Background technology
At present, in the zoom lens that the civilian video camera of TV broadcasting video camera and high image quality type adopts, be known to employ the zoom lens of the 3 plates shooting modes (such as red, green, blue assorted use special imaging apparatus respectively and carry out the mode of coloured image shooting) of colour splitting prism.As the lens type adopted at these zoom lens, many motions are had to propose by possessing first lens combination with positive refracting power, second lens combination with negative refractive power successively from object side, have the 3rd lens combination of positive refracting power, having 4 groups of zoom lens formed of the 4th these four lens combination of lens combination of positive refracting power, or by adding 5 groups of zoom lens formed of a lens combination again.
Be suitable for the zoom lens of these 3 plates shooting mode, it is characterized in that, heavy caliber ratio (such as F1.4 ~ F1.8) and rear cut-off distance (also referred to as rear side focal length) large (with reference to patent documentation 1 and patent documentation 2).
In addition, also know, in order to guarantee good optical property on the basis meeting such feature, the optimization that the lens that particularly importantly aperture diaphragm is later are formed.
Such as, the 3rd lens combination being known to configure in aperture diaphragm dead astern is by 3 zoom lens formed (with reference to patent documentation 1) and by 5 zoom lens formed (with reference to patent documentation 2).In zoom lens described in patent documentation 2, its 3rd lens combination has anti-vibration functions, and lens number is many, in any case, with regard to being suitable for the zoom lens of 3 plate shooting modes, after the 3rd lens combination, needs many lens.
In addition, in the zoom lens described in patent documentation 1, because zoom ratio does not reach more than 10 times, thus adopt the formation that the lens number of 4 groups is few, but to make zoom ratio increase further, then these 4 groups of lens numbers will increase.
But, in the zoom lens being applicable to the veneer shooting mode mode of an imaging apparatus color image shot (use), be known to the 3rd lens combination and be made up of (with reference to patent documentation 3) the type of dolly-out,ing dolly-back of 2 groups 2.The zoom lens being applicable to this veneer shooting mode can realize heavy caliber ratio (F1.4 ~ F1.6) by less lens number.
Patent documentation 1: Japanese Unexamined Patent Publication 2006-133582 publication
Patent documentation 2: Japanese Unexamined Patent Publication 2007-322635 publication
Patent documentation 3: Japanese Unexamined Patent Publication 6-300968 publication
But, if for 3 plates shooting modes the zoom lens use that is suitable for and above-mentioned veneer make a video recording mode the same formation of the 3rd lens combination of zoom lens that is suitable for, and make this 3 plate make a video recording mode the 3rd lens combination of zoom lens that is suitable for be made up of 2 lens, then think the miniaturization and cost degradation that can realize zoom lens.
At this, due to 3 plates shooting modes the later power of lens configuration of the 3rd lens combination of zoom lens that is suitable for understand and differ widely along with the rear cut-off distance to this zoom lens defined, thus in order to by the 3rd lens combination by 2 structures formed 3 plates make a video recording modes adopt in the zoom lens that is suitable for, just needs formation zoom lens the power configuration of each group and in the selection of the lenticular unit of formation the 3rd lens combination, carry out discuss and study.
In addition, in the large zoom lens of rear cut-off distance under forming at 4 groups (3 plates shooting modes be suitable for) and zoom lens that under forming at 4 groups, rear cut-off distance is little (veneer make a video recording mode be suitable for), the effect born in the 3rd lens combination and the 4th lens combination and the power configuration of distributing in these lens combination there is very large difference.
Namely, be applicable in the zoom lens of 3 plate shooting modes, in order to obtain large rear cut-off distance, to weaken with the focal power of the 3rd lens combination and the mode that the focal power of the 4th lens combination strengthens is formed, like this equilibrium of lens error correction of the zoom lens of formation and veneer make a video recording mode the equilibrium of the lens error correction of zoom lens that is suitable for completely different.
Such as, the veneer shooting mode that the rear cut-off distance shown in patent documentation 3 is little be suitable for formation the 3rd lens combination of zoom lens and have in the lens of positive refracting power, employ low chromatic dispersion material.Like this, in the zoom lens of the little type of rear cut-off distance, it is desirable to implement achromatism (correction of chromatic aberation) to each lens combination, it is desirable to also to use low chromatic dispersion material in order to achromatism in the 3rd lens combination.In addition, in explanation afterwards, the lens with positive refracting power are called positive lens or positive lens, the lens with negative refractive power are called negative lens or negative lens.
On the other hand, in the zoom lens being applicable to 3 plate shooting modes, to make rear cut-off distance become large, then the focal power of the 3rd lens combination weakens, and the ray height increase that the 4th lens combination is incident.Therefore, with regard to chromatic aberation, importantly the 4th lens combination bears the correction of multiplying power chromatic aberation (also claiming ratio chromatism), and the 3rd lens combination bears the correction of chromatic aberation on axle.More specifically, become because being made chromatic aberation on axle by the 4th lens combination and revise superfluous tendency, so need chromatic aberation on the axle by being eliminated this correction surplus tendency by the 3rd lens combination to ensure the equilibrium of this axle colouring lens error correction.Like this, in the zoom lens being applicable to 3 plate shooting modes, sometimes achromatism (correction of chromatic aberation) is implemented in the scope of multiple lens combination.
In addition, in the zoom lens being applicable to 3 plate shooting modes, when realizing reaching the high magnification of 20 times, most importantly for the group i.e. formation of the 4th lens combination of focus adjustment and the optimization of focal power distribution.Such as, if the focal power of the 4th lens combination is weak, then in zoom and focusing time the mobile quantitative change of the 4th lens combination large and zoom lens is maximized.On the other hand, in order to the miniaturization of zoom lens, need the lens combination i.e. focal power of the 3rd lens combination with the positive refracting power identical with the 4th lens combination is strengthened, if but like this, be difficult to make rear cut-off distance become large.On the contrary, if make the focal power of the 4th lens combination too strengthen, then the effective diameter of the 4th lens combination becomes large and focusing steadily can not effectively be carried out such problem and can produce.Like this, at high magnification and in the zoom lens of heavy caliber ratio, obtaining large rear cut-off distance by being made up of less lens number after the 3rd lens combination is that such problem of difficulty exists.
Summary of the invention
The present invention sets up in view of above-mentioned actual conditions, its object is to provide a kind of and can be obtained the high magnification of large rear cut-off distance by few lens number and the zoom lens of heavy caliber ratio and camera head.
The feature of zoom lens of the present invention is, have successively from object side: during zoom relative to optical axis direction be fixed and there is the first lens combination of positive refracting power, move during zoom and make that multiplying power changes and there is the second lens combination of negative refractive power, during zoom relative to optical axis direction be fixed and there is the 3rd lens combination of positive refracting power, move during zoom the variation of the adjoint image planes position of described zoom revised and focus and there is the 4th lens combination of positive refracting power, and, 3rd lens combination is by the 3rd group of first lens with positive refracting power, with concave surface facing object side and the 3rd group of two panels that the second lens are such with negative refractive power form, 4th lens combination has the positive lens of negative lens and more than 2, the 3rd group of the first lens formation optics be set to ν d31 with the d line Abbe number that is benchmark time, the formula that satisfies condition (1): 16 < ν d31 < 35.
Described 4th lens combination can have the negative lens of more than 2.In addition, the 4th lens combination only can have 1 negative lens.
As preferably, described zoom lens, is set to f3 at the focal length of the 3rd lens combination entirety, the focal length of the 4th lens combination entirety is when being set to f4, the formula that satisfies condition (2): 2.8 < f3/f4 < 12.0.
As preferably, described zoom lens, when the focal length of the zoom lens whole system when zoom settings is due to telescope end is set to ft, the formula that satisfies condition (3): 0.2 < f4/ft < 0.5.
Preferred zoom lens when the focal length of the 3rd group of the first lens is set to f31, the formula that satisfies condition (4): 0.2 < f31/f3 < 0.7.
Preferred described zoom lens the 3rd group of the second lens formation optics be set to ν d32 with the d line Abbe number that is benchmark time, the formula that satisfies condition (5): ν d32-ν d31 < 30.
Described 4th lens combination can be made up of 3 positive lenss and 1 negative lens.
Described 4th lens combination can by positive simple lens, the cemented lens configured successively from object side. and positive signal-lens like this 3 groups 4 are formed.
In addition, positive simple lens refers to the signal-lens meaning with positive refracting power.
Preferred described zoom lens in the respective formation optics of the positive lens that the 4th lens combination configures, the Abbe number that take the d line Abbe number that is benchmark as maximum optics is when being set to ν d4p, the formula that satisfies condition (6): 60 < ν d4p.
Such as, the Abbe number that positive lens in 4th lens combination is the first positive lens ~ the 3rd positive lens these 3, the Abbe number of the first positive lens is ν 1, second positive lens is ν 2, the Abbe number of the 3rd positive lens is ν 3, when ν 1 < ν 2 < ν 3, the value of the applicable ν 3 of the value as ν d4p.
When the interval of three group first lens of preferred described zoom lens on optical axis and the 3rd group of the second lens is set to d, the thickness of the 3rd lens combination entirety on optical axis is set to TL3, the formula that satisfies condition (7): 0.2 < d/TL3 < 0.8.
In addition, the 3rd group of the first lens and the 3rd group of the second lens be spaced apart the lens face of the 3rd group of the first lens adjacent to each other and the interval of lens face on optical axis (airspace) of the 3rd group of the second lens.In addition, the thickness of the 3rd lens combination entirety is from the 3rd lens combination, lean on the lens face of object side to the 3rd lens combination, lean on thickness distance corresponding to of lens face on optical axis of image side most most.
The all lens faces forming described 3rd lens combination all can be set to sphere.That is, the 3rd lens combination structure that all lens faces can be adopted to be formed by sphere.
The all lens faces forming described 4th lens combination all can be set to sphere.That is, the 4th lens combination structure that all lens faces can be adopted to be formed by sphere.
Described zoom lens is set to f2 at the focal length of the second lens combination, when being set to fw at the focal length of the zoom lens whole system of zoom settings when the wide-angle side, the formula that satisfies condition (8): 0.4 < | f2|/(fwft)
1/2< 0.8.
Described second lens combination can be made up of 3 negative lenses and 1 positive lens.
In described second lens combination, be configured with successively from object side: second group of first lens with negative refractive power, second group of second lens with negative refractive power, there are second group of the 3rd lens of positive refracting power, there are second group of the 4th lens of negative refractive power.
The feature of camera head of the present invention is, possesses described zoom lens.
In addition, with regard to the lens number when comprising cemented lens, by the cemented lens by making n sheet lens engage, as what be made up of n sheet lens, and its lens number is counted.
In addition, with regard to lens combination, be not limited to be made up of multiple lens, also can be made up of 1 lens.
In addition, the Abbe number of the optics being benchmark with d line is the value of being tried to achieve by ν=(Nd-1)/(NF-NC) formula.Wherein, NF is the refractive index of optics to F line (486.1nm), and Nd is the refractive index of optics to d line (587.6nm), and NC is the refractive index of optics to C line (656.3nm).
According to zoom lens of the present invention and camera head, owing to having successively from object side: be fixed during zoom and there is the first lens combination of positive refracting power, during zoom movement and there is the second lens combination of negative refractive power, that be fixed during zoom and there is the 3rd lens combination of positive refracting power, move during zoom the variation of the adjoint image planes position of this zoom revised and focus and there is the 4th lens combination of positive refracting power, 3rd lens combination by there is the 3rd group of the first lens of positive refracting power and concave surface facing object side and there are such 2 of the 3rd group of the second lens of negative refractive power form, 4th lens combination has the positive lens of negative lens and more than 2, and the formula that satisfies condition (1): 16 < ν d31 < 35, thus, the equilibrium of the correction of chromatic aberation on axle and the correction of multiplying power chromatic aberation can be guaranteed well in the whole zoom territory of this zoom lens, and then large rear cut-off distance can be obtained by less lens number at high magnification while heavy caliber ratio.
That is, in order to ensure larger rear cut-off distance, if the focal power of the 3rd lens combination weakens and the enhancing of the focal power of the 4th lens combination, then become large at the ray height of the 4th lens combination.Now, from the viewpoint of chromatic aberation correction, the 4th lens combination mainly bears the effect revising multiplying power chromatic aberation, and by chromatic aberation on the axle of the 4th lens combination correction with regard to some superfluous correction.
On the other hand, with regard to the 3rd lens combination, the state of good correction that not only can keep that multiplying power chromatic aberation is able to, and to make in above-mentioned 4th lens combination be chromatic aberation on the superfluous axle revised, and on the axle occurred by the 3rd lens combination little at ray height, chromatic aberation is eliminated.
Namely, reduce to make the variation of the chromatic aberation when zoom lens zoom is focused, make some correction of chromatic aberation on axle superfluous by the 4th lens combination, the positive lens of the 3rd lens combination is used to the high chromatic dispersion material of the formula (1) that satisfies condition, revise according to some generation in the 4th lens combination the mode that chromatic aberation on superfluous axle eliminated by chromatic aberation on the axle that produces in the 3rd lens combination, can equilibrium be obtained.
The correction of such chromatic aberation is applicable too when zoom lens high magnification, and the correction of chromatic aberation can regulate with the balanced of correction of chromatic aberation on the axle that the 4th lens combination is born on the axle born of the 3rd lens combination, thus, large rear cut-off distance can be obtained by less lens number at high magnification while heavy caliber ratio.
On the other hand, if exceed the scope of conditional (1) and form this zoom lens, then the problem that on axle, the equilibrium of the correction of chromatic aberation and the correction of multiplying power chromatic aberation can not be guaranteed can produce.
Accompanying drawing explanation
Figure 1A is the sectional view of the schematic configuration of the camera head representing the zoom lens possessing embodiment of the present invention;
Figure 1B represents the figure compared each state when the zoom lens of camera head is set in wide-angle side and telescope end;
Fig. 2 A is the sectional view of the schematic configuration of the zoom lens representing embodiment 1;
Fig. 2 B represents the figure compared each state when the zoom lens of embodiment 1 is set in wide-angle side and telescope end;
Fig. 3 A is the sectional view of the schematic configuration of the zoom lens representing embodiment 2;
Fig. 3 B represents the figure compared each state when the zoom lens of embodiment 2 is set in wide-angle side and telescope end;
Fig. 4 A is the sectional view of the schematic configuration of the zoom lens representing embodiment 3;
Fig. 4 B represents the figure compared each state when the zoom lens of embodiment 3 is set in wide-angle side and telescope end;
Fig. 5 A is the sectional view of the schematic configuration of the zoom lens representing embodiment 4;
Fig. 5 B represents the figure compared each state when the zoom lens of embodiment 4 is set in wide-angle side and telescope end;
Fig. 6 A is the sectional view of the schematic configuration of the zoom lens representing embodiment 5;
Fig. 6 B represents the figure compared each state when the zoom lens of embodiment 5 is set in wide-angle side and telescope end;
Fig. 7 A is the sectional view of the schematic configuration of the zoom lens representing embodiment 6;
Fig. 7 B represents the figure compared each state when the zoom lens of embodiment 6 is set in wide-angle side and telescope end;
Fig. 8 A is the sectional view of the schematic configuration of the zoom lens representing embodiment 7;
Fig. 8 B represents the figure compared each state when the zoom lens of embodiment 7 is set in wide-angle side and telescope end;
Fig. 9 is the figure of the various aberrations of the zoom lens representing embodiment 1;
Figure 10 is the figure of the various aberrations of the zoom lens representing embodiment 2;
Figure 11 is the figure of the various aberrations of the zoom lens representing embodiment 3;
Figure 12 is the figure of the various aberrations of the zoom lens representing embodiment 4;
Figure 13 is the figure of the various aberrations of the zoom lens representing embodiment 5;
Figure 14 is the figure of the various aberrations of the zoom lens representing embodiment 6;
Figure 15 is the figure representing the various aberration of the zoom lens of embodiment 7
Figure 16 is the figure representing the video camera using zoom lens of the present invention to form.
Symbol description
G1: the first lens combination
G2: the second lens combination
G3: the three lens combination
G4: the four lens combination
L31: the three group of first lens
L32: the three group of second lens
Embodiment
Below, zoom lens of the present invention is described with reference to accompanying drawing and possesses the camera head of this zoom lens.
Figure 1A, Figure 1B are the sectional views of the schematic configuration representing the camera head possessing zoom lens of the present invention, Figure 1A is the figure of the state represented in detail when zoom settings is due to wide-angle side, Figure 1B is represent the figure compared respectively the state when zoom settings is due to wide-angle side and telescope end.The figure represented by (W) in Figure 1B is the state when zoom settings is due to wide-angle side, and the figure represented by (T) in Figure 1B is the state when zoom settings is due to telescope end.
The plant bulk of illustrated camera head 200 is little, there is large rear cut-off distance (also referred to as rear side focal length), be equipped with the 3 plates shooting modes employing colour splitting prism the camera head that uses of the TV broadcasting video camera etc. of the zoom lens 100 of high magnification heavy caliber ratio that is suitable for.
This zoom lens 100 makes the optical image Hk of expression subject H be imaged on the sensitive surface 210J of the imaging apparatus 210 be made up of CCD and CMOS etc.In addition, the zoom lens 100 of this high magnification heavy caliber ratio, can obtain large rear cut-off distance by less lens number.
The imaging apparatus 210 that camera head 200 configures, by the optical image Hk of the expression subject H of imaging is transformed to electric signal by zoom lens 100, and will represent that the picture signal Pk of this optical image Hk exports.
As hypothesis, this zoom lens 100, controls convergent-divergent diameter from zoom settings when telescope end schedules the zone line of telescope end and wide-angle side up to zoom settings.
First, the basic comprising of zoom lens is described.
(basic comprising of zoom lens and effect, effect) thereof
Zoom lens 100 possesses from object side successively along optical axis Z1: during zoom relative to optical axis direction be fixed and there is the first lens combination G1 of positive refracting power, move during zoom and make that multiplying power changes and there is the second lens combination G2 of negative refractive power, during zoom relative to optical axis direction be fixed and there is the 3rd lens combination G3 of positive refracting power, move during zoom the variation of the adjoint image planes position of this zoom revised and focus and there is the 4th lens combination G4 of positive refracting power, and the optical parameter Cg1 of color separation optical system and various filter class, Cg2.
In addition, each optical parameter Cg1, Cg2 of being made up of planopaallel plate are configured in: form zoom lens 100 near image side configure and there is the image side of the lens of plus or minus refracting power and the object side of sensitive surface 210J.
3rd lens combination G3 by have the 3rd group of first lens L31 of positive refracting power, concave surface facing object side and the 3rd group of second lens L32 these 2 with negative refractive power form.In addition, preferably have the 3rd group of the first lens of positive refracting power and concave surface facing object side and there are the 3rd group of the second lens of negative refractive power, configure by said sequence from object side.
4th lens combination G4 has the positive lens (at this, being lens L41, L43, L44) of 1 negative lens (at this, being lens L42) and more than 2.
In addition, zoom lens 100 the 3rd group of the first lens formation optics be set to vd31 with the d line Abbe number that is benchmark time, the formula that satisfies condition (1): 16 < vd31 < 35.
In addition, rear cut-off distance is the distance from the summit of the last lens face of zoom lens 100 to rear side focus.At this, rear cut-off distance is with corresponding to the distance of the sensitive surface 210J making optical image Hk imaging from the image side lens face in the lens (lens L44) with plus or minus refracting power configured near image side forming zoom lens 100.
(formation that the basic comprising of zoom lens limits further)
Secondly, the inscape that the above-mentioned basic comprising possessed illustrated zoom lens 100 and camera head 200 limits further and effect thereof, effect are described.In addition, these inscapes that basic comprising limits further are not necessarily formed with regard to zoom lens 100 of the present invention and camera head 200.
In addition, although it is whole that zoom lens 100 of the present invention and camera head 200 meet the inscape that above-mentioned basic comprising limits further, zoom lens of the present invention both can meet in the inscape limited further these basic comprisings only one, also can meet plural combination.
First, the meaning of each parameter represented by mark in conditional (2) ~ (7) is summarized as follows.
F3 is the focal length of the 3rd lens combination entirety
F4 is the focal length of the 4th lens combination entirety
Ft is the focal length of the zoom lens whole system when zoom settings is due to telescope end
F31 is the focal length of the 3rd group of the first lens
Vd32 is the Abbe number being benchmark with d line of the optics of formation the 3rd group of the second lens
In the formation optics of each positive lens that vd4p configures for the 4th lens combination, take the d line Abbe number that is benchmark as the Abbe number of maximum optics
D is the interval (airspace) of the 3rd group of the first lens on optical axis and the 3rd group of the second lens
TL3 is the thickness of the 3rd lens combination entirety on optical axis
F2 is the focal length of the second lens combination
Fw is the focal length of the zoom lens whole system when zoom settings is due to wide-angle side
The formation that ◇ limits further to conditional (1)
Zoom lens 100 can satisfy condition formula (1 '): 17 < vd31 < 33.If formed zoom lens 100 in the mode of the formula of satisfying condition (1 '), then on the axle of the correction surplus that can be produced by the 4th lens combination G4 more accurately, chromatic aberation is eliminated by the 3rd lens combination G3.Thus, can form more easily high magnification heavy caliber than and obtained the zoom lens of large rear cut-off distance by few lens number.
The restriction formation that ◇ conditional (2) is relevant
By conditional (2): 2.8 < f3/f4 < 12.0 and preferred conditionals (2 '): 3.0 < f3/f4 < 11.5, be defined as the ratio of the focal distance f 3 of the 3rd lens combination G3 and the focal distance f 4 of the 4th lens combination G4, be the maximization for the follow-up lens combination not only preventing the 3rd lens combination G3 later, and guarantee enough large rear cut-off distance and make the condition penetrating pupil location in enough distant places.
If formed zoom lens 100 in the mode of the lower limit lower than conditional (2), then produce following problem: the focal power grow of the 3rd lens combination G3, when being difficult to suppress zoom and focusing time the variation of spherical aberration (also claiming spherical aberration), be difficult to the enough large rear cut-off distance obtained for color separation optical system and various filter class (at this, being optical parameter Cg1, Cg2) can be inserted simultaneously.In addition, compensate if die down to the focal power of the 4th lens combination G4 and the amount of movement of the 4th lens combination G4 increased, then during zoom and focusing time the variation of various aberrations become large, so will not be preferably.
In addition, in contrast, if formed zoom lens 100 in the mode of the upper limit higher than conditional (2), then owing to becoming large through the beam diameter (beam diameter dispersed) emitted by the 3rd lens combination G3, and the diameter making the diameter of the 4th lens combination G4 namely form the lens of the 4th lens combination G4 becomes large problem existence.
In addition, if formed zoom lens 100 in the mode of the formula of satisfying condition (2) or conditional (2 '), then the generation of this problem can be suppressed.In addition, if formed zoom lens 100 in the mode of the formula of satisfying condition (2 '), then can obtain the lens peculiarity than further wishing time the formula of satisfying condition (2).
The restriction formation that ◇ conditional (3) is relevant
Conditional (3): 0.2 < f4/ft < 0.5 and the conditional (3 ') of more wishing: 0.2 < f4/ft < 0.4 specifies the relation of the focal distance f t of the focal distance f 4 of the 4th lens combination G4 and the zoom lens whole system when zoom settings is due to telescope end.
If formed zoom lens 100 in the mode of the lower limit lower than conditional (3), then the focal power of the 4th lens combination G4 become too strong, and the problem being difficult to the spherical aberration that suppression the 4th lens combination G4 produces can produce.
In addition, in contrast, if formed zoom lens 100 in the mode of the upper limit exceeding conditional (3), then the focal power of the 4th lens combination G4 dies down, in order to the mobile quantitative change compensated this when will make the 4th lens combination G4 zoom is large, when zoom ratio is large, the problem that lens system entirety maximizes can produce.
In addition, if formed zoom lens 100 in the mode of the formula of satisfying condition (3) or conditional (3 '), then the generation of this problem can be suppressed.In addition, if formed zoom lens 100 in the mode of the formula of satisfying condition (3 '), then can obtain the lens peculiarity than further wishing time the formula of satisfying condition (3).
The restriction formation that ◇ conditional (4) is relevant
Conditional (4): 0.2 < f31/f3 < 0.7 and preferred conditional (4 '): 0.25 < f31/f3 < 0.6 specifies the focal distance f 31 of the 3rd group of first lens L31 in the 3rd lens combination G3 and the ratio of the 3rd lens combination G3 whole focal length f3.
If formed zoom lens 100 in the mode of the lower limit lower than conditional (4), then the focal power grow of the 3rd group of first lens L31, and the problem of various aberration especially high order spherical aberration correction deficiency can be produced.
In addition, in contrast, if formed zoom lens 100 in the mode of the upper limit exceeding conditional (4), then the focal power of the 3rd group of first lens L31 dies down, and the problem that the ratio of the negative focal power that the 3rd lens combination G3 has increases and curvature of the image and astigmatism are increased can produce.
In addition, if formed zoom lens 100 in the mode of the formula of satisfying condition (4) or conditional (4 '), then the generation of this problem can be suppressed.In addition, if (mode of 4 ' > is formed zoom lens 100, then can obtain the lens peculiarity than further wishing time the formula of satisfying condition (4) with the formula of satisfying condition.
The restriction formation that ◇ conditional (5) is relevant
Conditional (5): ν d32-ν d31 < 30 and most preferred conditional (5 '): ν d32-ν d31 < 28 specifies the difference of the Abbe number of the 3rd group of first lens L31 and the 3rd group of the second lens L32 in the 3rd lens combination 3G.
If formed zoom lens 100 in the mode of the upper limit exceeding conditional (5), then the problem that on axle, chromatic aberation increases can produce.
In addition, if formed zoom lens 100 in the mode of the formula of satisfying condition (5) or conditional (5 '), then the generation of this problem can be suppressed.In addition, if formed zoom lens 100 in the mode of the formula of satisfying condition (5 '), then can obtain the lens peculiarity than further wishing time the formula of satisfying condition (5).
The restriction formation that ◇ the 4th lens combination is relevant
4th lens combination G4 can be made up of 1 negative lens (lens L42) and 3 positive lenss (lens L41, L43, L44).If form the 4th lens combination G4 by this way, even if then when the zoom ratio of zoom lens 100 is large, the variation of the various aberrations produced when this zoom lens 100 zoom and when focusing also can be suppressed.
In addition, the 4th lens combination G4 can adopt by 3 groups of 4 structures formed of the positive simple lens (lens L41) configured successively from object side, cemented lens (lens L42, L43), positive simple lens (lens L44).If form the 4th lens combination G4 by this way, then as described above, even if in the very large situation of the zoom ratio of zoom lens 100, the variation of the various aberrations produced when this zoom lens 100 zoom and when focusing also can be suppressed.
The restriction formation that ◇ conditional (6) is relevant
Conditional (6): 60 < ν d4P and preferred conditional (6 '): 62 < ν d4p be defined in the positive lens (lens L41, L43, L44) that the 4th lens combination G4 configures, use with the Abbe number in the lens (such as, lens L43) of the maximum optics of the d line Abbe number that is benchmark.
The low chromatic dispersion material of formula (6) or conditional (6 ') if the employing of at least 1 positive lens (such as, lens L43) satisfies condition, then can the equilibrium of retainer shaft colouring lens error correction and the correction of multiplying power chromatic aberation well as mentioned above.
In addition, if formed zoom lens 100 in the mode of the formula of satisfying condition (6 '), then can obtain the lens peculiarity than further wishing time the formula of satisfying condition (6).
The restriction formation that ◇ conditional (7) is relevant
Conditional (7): 0.20 < d/TL3 < 0.80 and preferred conditional (7 '): 0.21 < d/TL3 < 0.75 is that the interval d of 2 lens (lens L31, L32) configured in the 3rd lens combination G3 has carried out the formula after standardizing by the 3rd lens combination G3 integral thickness TL3.
In addition, the interval d of 2 lens (lens L31, L32) is the interval (airspace) on optical axis of the lens face of the lens face of the image side of the 3rd group of the first lens (lens L31) and the object side of the 3rd group of the second lens (lens L32), and the thickness TL3 of the 3rd lens combination G3 entirety is the distance on optical axis from the lens face of the object side of the 3rd group of the first lens (lens L31) to the lens face of the image side of the 3rd group of the second lens (lens L32).
If formed zoom lens 100 in the mode of the lower limit lower than conditional (7), then principle point location can not near object side, and the problem that zoom lens is maximized can produce.
In addition, in contrast, if formed zoom lens 100 in the mode of the upper limit exceeding conditional (7), then amber hereby cuts down and becomes large at minus side, is difficult to obtain good image planes characteristic.
In addition, by the airspace of 2 lens (lens L31, L32) being extended to the scope as shown in conditional (7) or conditional (7 ') and being formed zoom lens 100 in the mode of the formula of satisfying condition (7) or conditional (7 '), the principle point location of the 3rd lens combination G3 can be made closer to object side, and then lens combination miniaturization can be made.
In addition, if formed zoom lens 100 in the mode of the formula of satisfying condition (7 '), then the principle point location of above-mentioned 3rd lens combination G3 can be made near object side than the formula of satisfying condition (7) Shi Gengke, and then lens combination miniaturization more can be made.
The restriction formation that ◇ the 3rd lens combination is relevant
All lens faces of formation the 3rd lens combination G3 (lens L31, L32) can be made sphere.
By the lens face (lens L31, L32) of formation the 3rd lens combination G3 is all made sphere, the easy to manufacture of lens can be made to realize cost degradation, meanwhile, the performance degradation caused because of foozle and assembly error can be made to reduce.
The restriction formation that ◇ the 4th lens combination is relevant
All lens faces of formation the 4th lens combination G4 (lens L41 ~ L44) can be made sphere.
By the lens face (lens L41 ~ L44) of formation the 4th lens combination G4 is all made sphere, the easy to manufacture of lens can be made and realize cost degradation, meanwhile, the performance degradation caused because of foozle and assembly error can be made to reduce.
The restriction formation that ◇ conditional (8) is relevant
Conditional (8): 0.4 < | f2|/(fwft)
1/2< 0.8 and preferred conditional (8 '): 0.42 < | f2|/(fwft)
1/2< 0.75 specifies the relation of the focal distance f t of the focal length of the second lens combination G2, the focal distance f w of zoom lens 100 whole system when zoom settings is due to wide-angle side, zoom lens 100 whole system when zoom settings is due to telescope end.
If formed zoom lens 100 in the mode of the lower limit lower than conditional (8), then the focal power of the second lens combination G2 is excessively strong, and the problem that the problem of correction difficulty of curvature of the image and coma and the allowance of foozle are diminished produces.
In addition, the allowance of so-called foozle diminishes, and refers to that the sensitivity (susceptibility or performance degradation susceptibility) of the performance degradation caused by mismachining tolerance and assembly error etc. becomes the large meaning.If the allowance of foozle diminishes, then for mismachining tolerance and assembly error are responsive and the deterioration of performance becomes remarkable.On the other hand, diminish if the permission quantitative change of foozle is greatly performance degradation susceptibility, then the degradation of the performance caused by mismachining tolerance and assembly error can be made to slow up.
In addition, in contrast, if formed zoom lens 100 in the mode of the upper limit exceeding conditional (8), then the mobile quantitative change of the second lens combination G2 is large, ray height simultaneously through the first lens combination 1G becomes large, and the problem that zoom lens 100 entirety is maximized produces.
In addition, if formed zoom lens 100 in the mode of the formula of satisfying condition (8) or conditional (8 '), then the generation of this problem can be suppressed.In addition, if formed zoom lens 100 in the mode of the formula of satisfying condition (8 '), then can obtain the lens peculiarity than further wishing time the formula of satisfying condition (8).
The restriction formation that ◇ second lens combination is relevant
Second lens combination G2 can be made up of 3 negative lenses (at this, being lens L21, L22, L24) and 1 positive lens (in this case lens L23).If form the second lens combination G2 by this way, then because the second lens combination G2 has 3 negative lenses, thus the position of the object side principal point of the second lens combination G2 entirety can be made near object side, and then shorten the principal point interval of the first lens combination G1 and the second lens combination G2, the height that axle outer light beam can be passed the first lens combination G1 keeps low, thus, the maximization of the first lens combination G1 can be suppressed.
The restriction formation that ◇ second lens combination is relevant
Second lens combination G2 can be configured with successively from object side: second group of first lens (lens L21) with negative refractive power, second group of second lens (lens L22) with negative refractive power, have second group of the 3rd lens (lens L23) of positive refracting power, have second group of the 4th lens (lens L24) of negative refractive power.If form the second lens combination G2 like this, then can configure 2 negative lenses continuously and the focal power born concentrated by the object side in the second lens combination G2, and height axle outer light beam being passed the first lens combination G1 keeps lower, thus, can suppress the maximization of the first lens combination G1.
(specific embodiment)
Below, with reference to Fig. 2 A, 2B ... 8A, 8B, table 1 ~ 8, the numeric data etc. respective about the embodiment 1 ~ 7 of zoom lens of the present invention carries out conclusion explanation.In addition, consistent with the symbol in Figure 1A, 1B of representing above-mentioned zoom lens 100 Fig. 2 A, 2B ... symbol in 8A, 8B represents the formation corresponded to each other.
Fig. 2 A, 2B ... 8A, 8B are the sectional views of the zoom lens schematic configuration separately representing embodiment 1 ~ 7.
Fig. 2 A, 3A ... 8A represents the figure of zoom settings due to the state of telescope end in detail, Fig. 2 B, 3B ... 8B represents the figure to comparing in the state of zoom settings due to wide-angle side and the state due to telescope end.The figure represented by (W) in Fig. 2 B ~ Fig. 8 B is by the state of zoom settings due to wide-angle side, and the figure represented by (T) in Fig. 2 B ~ Fig. 8 B is by the state of zoom settings due to telescope end.
In addition, Fig. 2 A, 3A ... L1 shown in each figure of 8A, L2 ... symbol, refers to the symbol of each lens, corresponding with the order of the lens be arranged in order from object side.Wherein, symbol L31, L32 are not corresponding with the lens order be arranged in order from object side, and symbol L31 represents the 3rd group of the first lens, and symbol L32 represents the 3rd group of the second lens.In addition, the symbol L21 ~ L24 in Figure 1A, 1B represents the lens in second group, and symbol L41 ~ L44 represents the lens in the 4th group.
In addition, about the lens number when comprising cemented lens, by the cemented lens by making n sheet lens engage, as what be made up of n sheet lens, and its lens number is counted.
Table 1 ~ 8 are the figure of the zoom lens master data separately representing embodiment 1 ~ 7.Top (representing with symbol (a) in figure) in each table in table 1 ~ 7 represents lens data, and bottom (representing with symbol (b) in figure) represents the outline specification of zoom lens.
In addition, all lens faces forming the zoom lens in these embodiments are all sphere or plane.
In addition, the zoom lens about embodiment 1 ~ 7 is represented, by each value (in each example the determined value that calculated by the calculating formula in inequality or the value corresponding with the constant of the zoom lens optics represented by mark in inequality) of the respective inequality determination scope in conditional (1) ~ (8) in table 8.
In addition, as hypothesis, these zoom lens from zoom settings due to telescope end up to zoom settings when the zone line of telescope end and wide-angle side, to the convergent-divergent diameter of aperture diaphragm assembling (
り Write む) the mode of restriction carry out system and drive.By this convergent-divergent diameter, to be about F2.9 at telescope end, mode controls.
In each lens data on top, table 1 ~ 7, face sequence number Si represent along with from No. i-th that increases successively towards image side near object side (i=1,2,3 ...) the sequence number of lens face etc.In addition, in these lens datas, also comprise aperture diaphragm St and recorded.
Radius of curvature R i represent No. i-th (i=1,2,3 ...) radius-of-curvature in face, face interval D i (i=1,2,3 ...) represent the interval, face on optical axis Z1 in No. i-th face and the i-th ten No. 1 faces.The symbol Ri of lens data and symbol Di with represent lens face etc. symbol Si (i=1,2,3 ...) corresponding.
In addition, face interval D i (i=1,2,3 ...) hurdle record presentation surface interval numeral situation and record symbol Dn (n is numerical value) situation exist, the interval, face (airspace) wherein recorded between symbol Dn part and lens combination is corresponding, and these intervals, face (airspace) change along with the change of zoom ratio.
Ndj represent about along with the jth that increases successively towards image side from object side number (j=1,2,3 ...) refractive index to wavelength 587.6nm (d line) of optical parameter, ν dj represents the Abbe number being benchmark with d line of jth optical parameter.
In the lens data of table 1 ~ 7, the unit at radius-of-curvature and interval, face is mm, with regard to radius-of-curvature, be just set to when object side is convex, be set to when image side is convex negative.
In addition, the hurdle that the bottom of table 1 ~ 7 is represented by symbol (b), represents each value in wide-angle side and telescope end, that is, f is the focal length (unit mrn) of lens whole system, and Fno is F number, 2 ω are full visual angle, and Dg, D15, D20, D27 etc. are the interval between each lens combination.
In addition, finally the carry out conclusion of table 1 ~ 8 in the explanation of " the specific embodiment of the present invention " is represented.
In addition, Fig. 9 ~ 15 are figure of the various aberrations of each zoom lens representing embodiment 1 ~ embodiment 7.The aberration relevant with each light of wavelength 587.6nrn, wavelength 460.0nm, wavelength 615.0nm is illustrated in figure.
The each aberration diagram corresponding to symbol (A) ~ (D) represented in each figure of above-mentioned Fig. 9 ~ Figure 15 is the figure of wide-angle side, represents spherical aberration (also claiming spherical aberration) (A), astigmatism (also claiming astigmatism) (B), distortion (distortion aberration) (C), ratio chromatism, (chromatic aberation of multiplying power) (D) respectively.In addition, the each aberration diagram corresponding to symbol (E) ~ (H) shown in each figure is the figure of telescope end, represents spherical aberration (E), astigmatism (F), distortion (distortion aberration) (G), ratio chromatism, (chromatic aberation of multiplying power) (H) respectively.
In addition, in distortion figure, use focal distance f, the half angle of view θ (being variable, 0≤θ≤ω) of lens whole system, desirable image height is set to f × tan θ, represents the side-play amount apart from it.
Learn that according to the numeric data relevant with embodiment 1 ~ 7 and aberration diagram etc. high magnification of the present invention and the zoom lens of heavy caliber ratio and camera head can realize large rear cut-off distance by few lens number.
Figure 16 is the pie graph of the video camera of one of the camera head representing that use zoom lens of the present invention is formed example.In addition, also illustrate schematically the first lens combination G1, the second lens combination G2 that zoom lens 1 possesses, aperture diaphragm St, the 3rd lens combination G3, the 4th lens combination G4 in figure 16.
Illustrated video camera 10 is for having the camera head of the so-called 3CCD mode of 3 imaging apparatuss, but camera head of the present invention is not limited thereto, and also can be what made a video recording to full wavelength band by 1 imaging apparatus.Video camera 10 possesses: zoom lens 1; The wave filter 2 with the function such as low-pass filter and infrared ray cut off filter configured in the image side of zoom lens 1; Colour splitting prism 3R, 3G, 3B of configuring in the image side of wave filter 2; At imaging apparatus 4R, 4G, 4B set by the end face of each colour splitting prism; Signal processing circuit 5.The optical image formed by zoom lens 1 is transformed to electric signal by imaging apparatus 4R, 4G, 4B, such as, can use CCD (Charge Coupled Device).Imaging apparatus 4R, 4G, 4B configure according to the mode that its imaging surface is consistent with the imaging surface of the optical image of the colors formed by zoom lens 1 respectively.
Through the light of zoom lens 1, after light component being needed to remove by wave filter 2, be broken down into each coloured light of red, green, blue by colour splitting prism 3R, 3G, 3B, and imaging in the imaging surface of imaging apparatus 4R, 4G, 4B.From the output signal of imaging apparatus 4R, 4G, the 4B corresponding with each coloured light of red, green, blue, carry out calculation process by signal processing circuit 5 and be generated colour picture signal.Generated by signal processing circuit 5 and the colour picture signal exported be imported into indication device 6 carry out aobvious not.
In addition, the invention is not restricted to the various embodiments described above, various distortion can be implemented in the scope of main idea not changing invention.Such as, the value etc. of the radius-of-curvature of each lens, interval, face and refractive index is not limited to the numerical value represented in above-mentioned each table, can obtain other value.
[table 1]
embodiment 1
Fno. the numerical value in () is the situation not having scale Limit.
[table 2]
embodiment 2
Fno. the numerical value in () is the situation not having scale Limit.
[table 3]
embodiment 3
Fno. the numerical value in () is the situation not having scale Limit.
[table 4]
embodiment 4
Fno. the numerical value in () is the situation not having scale Limit.
[table 5]
embodiment 5
Fno. the numerical value in () is the situation not having scale Limit.
[table 6]
embodiment 6
Fno. the numerical value in () is the situation not having scale Limit.
[table 7]
Embodiment 7
Fno. the numerical value in () is the situation not having scale Limit.
[table 8]
Claims (20)
1. a zoom lens, is characterized in that,
From object side successively by during zoom relative to optical axis direction be fixed and there is the first lens combination, the zoom of positive refracting power time move and make that multiplying power changes and there is the second lens combination, the zoom of negative refractive power time relative to optical axis direction be fixed and there is the 3rd lens combination, the zoom of positive refracting power time move the variation of the adjoint image planes position of described zoom revised and focus and the 4th lens combination with positive refracting power form
Described 3rd lens combination is made up of the 3rd group of the first lens and the 3rd group of this two panels of the second lens, and described 3rd group of the first lens have positive refracting power, and described 3rd group of the second lens make concave surface facing object side and have negative refractive power,
Described 4th lens combination has the positive lens of more than negative lens and two panels,
Further, following conditional (1), (2a) is met:
16＜vd31＜35…(1)
3.26≤f3/f4＜12.0…(2a)
Wherein, vd31 is the Abbe number being benchmark with d line of the formation optics of the 3rd group of the first lens, and f3 is the focal length of the 3rd lens combination, and f4 is the focal length of the 4th lens combination.
2. zoom lens as claimed in claim 1, is characterized in that,
Meet following conditional (3)
0.2＜f4/ft＜0.5…(3)
Wherein,
Ft is the focal length of the zoom lens whole system when zoom settings is due to telescope end.
3. zoom lens as claimed in claim 1, is characterized in that,
Meet following conditional (4):
0.2＜f31/f3＜0.7…(4)
Wherein,
F31 is the focal length of the 3rd group of the first lens.
4. zoom lens as claimed in claim 1, is characterized in that,
Meet following conditional (5)
vd32-vd31＜30…(5)
Wherein,
Vd32 is the Abbe number being benchmark with d line of the formation optics of the 3rd group of the second lens.
5. zoom lens as claimed in claim 1, is characterized in that,
Described 4th lens combination is made up of three positive lenss and a slice negative lens.
6. zoom lens as claimed in claim 1, is characterized in that,
Described 4th lens combination is made up of the positive simple lens configured successively from object side, cemented lens, positive signal-lens like this 3 groups 4.
7. zoom lens as claimed in claim 5, is characterized in that,
Meet following conditional (6):
60＜vd4p…(6)
Wherein,
In the respective formation optics of the positive lens that vd4p configures for the 4th lens combination, take the d line Abbe number that is benchmark as the Abbe number of maximum optics.
8. zoom lens as claimed in claim 1, is characterized in that,
Meet following conditional (7):
0.2＜d/TL3＜0.8…(7)
Wherein,
D is the interval (airspace) on optical axis of the 3rd group of the first lens and the 3rd group of the second lens,
TL3 is the thickness on optical axis of the 3rd lens combination entirety.
9. zoom lens as claimed in claim 1, is characterized in that,
The all lens faces forming described 3rd lens combination are sphere.
10. zoom lens as claimed in claim 1, is characterized in that,
The all lens faces forming described 4th lens combination are sphere.
11. zoom lens as claimed in claim 1, is characterized in that,
Meet following conditional (8):
0.4＜|f2|/(fw·ft)
1/2＜0.8…(8)
Wherein,
F2 is the focal length of the second lens combination,
Fw is the focal length of the zoom lens whole system when zoom settings is due to wide-angle side,
Ft is the focal length of the zoom lens whole system when zoom settings is due to telescope end.
12. zoom lens as claimed in claim 1, is characterized in that,
Described second lens combination is made up of 3 negative lenses and 1 positive lens.
13. zoom lens as claimed in claim 1, is characterized in that,
Described second lens combination is configured with successively from object side: second group of first lens with negative refractive power, second group of second lens with negative refractive power, have second group of the 3rd lens of positive refracting power, have second group of the 4th lens of negative refractive power.
14. zoom lens as claimed in claim 1, is characterized in that,
Meet following conditional (3):
0.2＜f4/ft＜0.5…(3)
Wherein,
Ft is the focal length of the zoom lens whole system when zoom settings is due to telescope end.
15. zoom lens as claimed in claim 14, is characterized in that,
Meet following conditional (4):
0.2＜f31/f3＜0.7…(4)
Wherein,
F31 is the focal length of the 3rd group of the first lens.
16. zoom lens as claimed in claim 15, is characterized in that,
Meet following conditional (5):
vd32-vd31＜30…(5)
Wherein,
Vd32 is the Abbe number being benchmark with d line of the formation optics of the 3rd group of the second lens.
17. zoom lens as claimed in claim 16, is characterized in that,
Described 4th lens combination is made up of 3 positive lenss and 1 negative lens.
18. zoom lens as claimed in claim 17, is characterized in that,
Described 4th lens combination is made up of such 3 groups 4 of the positive simple lens configured successively from object side, cemented lens, positive simple lens.
19. zoom lens as claimed in claim 6, is characterized in that,
Meet following conditional (6):
60＜vd4p…(6)
Wherein,
In the respective formation optics of the positive lens that vd4p configures for the 4th lens combination, take the d line Abbe number that is benchmark as the Abbe number of maximum optics.
20. 1 kinds of camera heads, is characterized in that, possess zoom lens according to claim 1.
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| JP2010135907A JP5491292B2 (en) | 2010-06-15 | 2010-06-15 | Zoom lens and imaging device |
| JP2010-135907 | 2010-06-15 |
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| CN105143950B (en) * | 2013-06-21 | 2018-01-23 | 奥林巴斯株式会社 | Zoom lens and the camera device with the zoom lens |
| JP6418893B2 (en) | 2014-10-21 | 2018-11-07 | キヤノン株式会社 | Zoom lens and imaging apparatus having the same |
| JP6396271B2 (en) * | 2015-09-07 | 2018-09-26 | 富士フイルム株式会社 | Zoom lens and imaging device |
| JP6812101B2 (en) * | 2015-12-18 | 2021-01-13 | 株式会社タムロン | Optical system and imaging device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5966245A (en) * | 1995-08-30 | 1999-10-12 | Olympus Optical Co., Ltd. | Zoom lens system |
| CN100360981C (en) * | 2004-04-20 | 2008-01-09 | 索尼株式会社 | Zoom lens and imaging device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP3019664B2 (en) * | 1993-04-30 | 2000-03-13 | キヤノン株式会社 | Rear focus zoom lens |
| JP3582872B2 (en) * | 1994-12-20 | 2004-10-27 | 松下電器産業株式会社 | Zoom lens and video camera using the same |
| JP2007248952A (en) * | 2006-03-17 | 2007-09-27 | Olympus Imaging Corp | Bending variable power optical system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5966245A (en) * | 1995-08-30 | 1999-10-12 | Olympus Optical Co., Ltd. | Zoom lens system |
| CN100360981C (en) * | 2004-04-20 | 2008-01-09 | 索尼株式会社 | Zoom lens and imaging device |
Non-Patent Citations (2)
| Title |
|---|
| JP特开平6-317750A 1994.11.15 * |
| JP特开平8-179206A 1996.07.12 * |
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| JP2012002902A (en) | 2012-01-05 |
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