CN102289057A - Zoom lens and imaging device - Google Patents
Zoom lens and imaging device Download PDFInfo
- Publication number
- CN102289057A CN102289057A CN2011101585428A CN201110158542A CN102289057A CN 102289057 A CN102289057 A CN 102289057A CN 2011101585428 A CN2011101585428 A CN 2011101585428A CN 201110158542 A CN201110158542 A CN 201110158542A CN 102289057 A CN102289057 A CN 102289057A
- Authority
- CN
- China
- Prior art keywords
- lens
- zoom
- zoom lens
- combination
- lens combination
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Landscapes
- Lenses (AREA)
- Structure And Mechanism Of Cameras (AREA)
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 the zoom lens of a kind of high magnification and heavy caliber ratio and possess the camera head of this zoom lens.
Background technology
At present, in TV plays the zoom lens that civilian video camera adopted with video camera and high image quality type, the known zoom lens that the 3 plates shooting mode (for example red, green, the blue mode of using special-purpose imaging apparatus respectively and carrying out the coloured image shooting of all kinds) of having used colour splitting prism is arranged.As in lens type that these zoom lens adopted, there are many motions to propose by 4 groups of zoom lens that constitute that possess first lens combination, second lens combination with positive refracting power, the 3rd lens combination from object side successively, have these four lens combination of the 4th lens combination of positive refracting power, perhaps by 5 groups of zoom lens that constitute that add a lens combination again with positive refracting power with negative refraction power.
Be suitable for the zoom lens of these 3 plates shooting modes, it is characterized in that, heavy caliber is than (for example F1.4～F1.8) and rear cut-off distance (being also referred to as the rear side focal length) big (with reference to patent documentation 1 and patent documentation 2).
In addition, also know, in order on the basis of satisfying such feature, to guarantee the good optical performance, the optimization that constitutes of the later lens of aperture diaphragm particularly importantly.
For example, known have the 3rd lens combination that is disposed in the aperture diaphragm dead astern by 3 zoom lens that constitute (with reference to patent documentation 1) and by 5 zoom lens that constitute (with reference to patent documentation 2).In the patent documentation 2 described zoom lens, its 3rd lens combination has anti-vibration functions, and the lens number is many, in any case, with regard to the zoom lens that is suitable for 3 plates shooting mode, needs many lens later in the 3rd lens combination.
In addition, in the patent documentation 1 described zoom lens, do not reach more than 10 times owing to become multiple proportions, thereby adopt 4 groups the few formation of lens number, still, if the change multiple proportions is further increased, then these 4 groups of lens numbers will increase.
But in the zoom lens that is applicable to veneer shooting mode (using the mode of an imaging apparatus color image shot), known have the 3rd lens combination by 2 groups 2 the type constitution of dolly-out,ing dolly-back (with reference to patent documentation 3).The zoom lens that is fit to this veneer shooting mode can realize that heavy caliber is than (F1.4～F1.6) by less lens number.
Patent documentation 1: TOHKEMY 2006-133582 communique
Patent documentation 2: TOHKEMY 2007-322635 communique
Patent documentation 3: Japanese kokai publication hei 6-300968 communique
But, if for the three lens combination same formation of the 3 plates shooting zoom lens that mode was suitable for use with the above-mentioned veneer shooting zoom lens that mode was suitable for, and the 3rd lens combination of this 3 plate shooting zoom lens that mode was suitable for is made of 2 lens, then thinks miniaturization and the cost degradation that to realize zoom lens.
At this, owing to the later power of lens configuration meeting of the 3rd lens combination of the 3 plates shootings zoom lens that mode was suitable for along with the rear cut-off distance to this zoom lens defined differs widely, thereby, just need reach in the selection of the lenticular unit of formation the 3rd lens combination and inquire into research in power configuration of each group that constitutes zoom lens for the 3rd lens combination is adopted in the 3 plates shootings zoom lens that mode was suitable for by 2 structures that constitute.
In addition, 4 groups constitute under in the big zoom lens (mode was suitable for the shooting of 3 plates) of rear cut-off distance and rear cut-off distance is little under 4 groups constitute the zoom lens (mode was suitable in the veneer shooting), the effect of bearing in the 3rd lens combination and the 4th lens combination reaches very big difference on the power configuration that these lens combination are distributed.
Promptly, be applicable in the zoom lens of 3 plates shooting mode, in order to obtain big rear cut-off distance, constitute in the mode that the focal power of the 3rd lens combination weakens and the focal power of the 4th lens combination strengthens, the make a video recording equilibrium of aberration correction of the zoom lens that mode was suitable for of the equilibrium of the aberration correction of the zoom lens of Gou Chenging and veneer is different fully like this.
For example, in formation the 3rd lens combination and the lens that have positive refracting power of the little veneer shooting zoom lens that mode was suitable for of the rear cut-off distance shown in the patent documentation 3, used low chromatic dispersion material.Like this, in the zoom lens of the little type of rear cut-off distance, wish each lens combination is implemented achromatism (correction of chromatic aberation), wish in the 3rd lens combination, also to use low chromatic dispersion material for achromatism.In addition, in the explanation afterwards, the lens that will have positive refracting power are called positive lens or positive lens, and the lens that will have negative refraction power are called negative lens or negative lens.
On the other hand, in the zoom lens that is applicable to 3 plates shooting mode, if will make rear cut-off distance become big, then the focal power of the 3rd lens combination weakens, and the light height of the 4th lens combination institute incident increases.Therefore, with regard to chromatic aberation, main is that the 4th lens combination is born the correction of (also claiming ratio chromatism) of multiplying power chromatic aberation, and the 3rd lens combination is born the correction of a last chromatic aberation.More specifically, revise superfluous the tendency, guarantee this upward equilibrium of chromatic aberation correction because a last chromatic aberation is become so need go up chromatic aberation by the axle of eliminating the superfluous tendency of this correction by the 3rd lens combination by the 4th lens combination.Like this, in the zoom lens that is applicable to 3 plates shooting mode, implement achromatism (correction of chromatic aberation) in the scope of a plurality of lens combination sometimes.
In addition, in the zoom lens that is applicable to 3 plates shooting mode, when realizing reaching 20 times high magnification, the group that most importantly is used for focus adjustment is the formation of the 4th lens combination and the optimization that focal power is distributed.For example, if a little less than the focal power of the 4th lens combination, then the mobile quantitative change of the 4th lens combination when becoming doubly and focusing makes zoom lens maximize greatly.On the other hand, for the miniaturization of zoom lens, need make the i.e. focal power enhancing of the 3rd lens combination of lens combination, but if so then be difficult to make rear cut-off distance to become big with positive refracting power identical with the 4th lens combination.On the contrary, if the focal power of the 4th lens combination is too strengthened, then the effective diameter of the 4th lens combination becomes big and focusing can not steadily be carried out such problem effectively and can produce.Like this, in the zoom lens of high magnification and heavy caliber ratio, to obtain big rear cut-off distance be that such problem of difficulty exists by being made of less lens number after the 3rd lens combination.
Summary of the invention
The present invention sets up in view of above-mentioned actual conditions, and its purpose is to provide a kind of can be obtained the high magnification of big rear cut-off distance and the zoom lens and the camera head of heavy caliber ratio by few lens number.
Zoom lens of the present invention is characterised in that, have successively from object side: be fixed with respect to optical axis direction and first lens combination that have positive refracting power when becoming times, move when becoming times and make change and second lens combination that have negative refraction power of multiplying power, be fixed with respect to optical axis direction and the 3rd lens combination that have positive refracting power when becoming times, move the 4th lens combination that the change of the image planes position that described change is doubly followed is revised and focused and have positive refracting power when becoming times, and, the 3rd lens combination is by the 3rd group of first lens with positive refracting power, with concave surface towards object side and two such formations of the 3rd group of second lens that have negative refraction power, the 4th lens combination has negative lens and the positive lens more than 2, the formation optics of the 3rd group of first lens be the Abbe number of benchmark when being made as ν d31 with the d line, the formula that satisfies condition (1): 16＜ν d31＜35.
Described the 4th lens combination can have the negative lens more than 2.In addition, the 4th lens combination can only have 1 negative lens.
As preferably, described zoom lens, when the focal length that is made as f3, the 4th lens combination integral body at the focal length of the 3rd lens combination integral body is made as 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 total system when zoom is set due to telescope end is made as 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 first lens is made as f31, the formula that satisfies condition (4): 0.2＜f31/f3＜0.7.
Preferred described zoom lens is the Abbe number of benchmark when being made as ν d32 the formation optics of the 3rd group of second lens with the d line, the formula that satisfies condition (5): ν d32-ν d31＜30.
Described the 4th lens combination can be made of 3 positive lenss and 1 negative lens.
Described the 4th lens combination can be by the positive simple lens that disposes successively from object side, joint lens. positive signal-lens 3 groups of such 4 formations.
In addition, positive simple lens is meant the signal-lens meaning with positive refracting power.
Preferred described zoom lens in the formation optics separately of the positive lens that the 4th lens combination is disposed, be that the Abbe number of benchmark is the Abbe number of the optics of maximum when being made as ν d4p with the d line, the formula that satisfies condition (6): 60＜ν d4p.
For example, positive lens in the 4th lens combination be the Abbe number of these 3 of first positive lens～the 3rd positive lenss, first positive lens be that the Abbe number of ν 1, second positive lens is that the Abbe number of ν 2, the 3rd positive lens is ν 3, when ν 1＜ν 2＜ν 3, as the value of the applicable ν 3 of the value of ν d4p.
When preferred described zoom lens is made as d, the 3rd lens combination integral body on optical axis at the interval of the 3rd group of first lens on the optical axis and the 3rd group of second lens thickness is made as TL3, the formula that satisfies condition (7): 0.2＜d/TL3＜0.8.
In addition, the interval (airspace) of lens face on optical axis of the lens face that is spaced apart the 3rd group of first lens that are adjacent to each other of the 3rd group of first lens and the 3rd group of second lens and the 3rd group of second lens.In addition, the thickness of the 3rd lens combination integral body be from the 3rd lens combination by the lens face of object side to the 3rd lens combination by looking like the pairing thickness of the distance of lens face on optical axis of side.
All lens faces that constitute described the 3rd lens combination all can be made as sphere.That is, the 3rd lens combination can adopt the structure that all lens faces are formed by sphere.
All lens faces that constitute described the 4th lens combination all can be made as sphere.That is, the 4th lens combination can adopt the structure that all lens faces are formed by sphere.
Described zoom lens is made as f2 at the focal length of second lens combination, when the focal length of zoom lens total system when zoom is set due to wide-angle side is made as fw, the formula that satisfies condition (8): 0.4＜| f2|/(fwft)
1/2＜0.8.
Described second lens combination can be made of 3 negative lenses and 1 positive lens.
In described second lens combination, dispose successively from object side: have negative refraction power second group of first lens, have negative refraction power second group of second lens, have second group of the 3rd lens of positive refracting power, second group of the 4th lens with negative refraction power.
Camera head of the present invention is characterised in that to possess described zoom lens.
In addition, with regard to regard to the lens number that comprises under the situation that engages lens, the joint lens that will form by n sheet lens are engaged as what be made of n sheet lens, and are counted its lens number.
In addition, with regard to lens combination, be not limited to constitute, also can constitute by 1 lens by a plurality of lens.
In addition, be the Abbe number of the optics of benchmark with the d line, be the value of trying to achieve by the formula of ν=(Nd-1)/(NF-NC).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 have successively: be fixed and first lens combination that have positive refracting power when becoming times from object side, move and second lens combination that have negative refraction power when becoming times, be fixed and the 3rd lens combination that have positive refracting power when becoming times, move the 4th lens combination that the change of this changes times image planes position of being followed is revised and focused and have positive refracting power when becoming times, the 3rd lens combination by the 3rd group of first lens with positive refracting power and concave surface towards object side and the 3rd group of second lens that have negative refraction power are such 2 constitute, the 4th lens combination has negative lens and the positive lens more than 2, and the formula that satisfies condition (1): 16＜ν d31＜35, thereby, can guarantee the equilibrium of the correction of the correction of chromatic aberation on the axle and multiplying power chromatic aberation in the whole zoom territory of this zoom lens well, and then can in high magnification and heavy caliber ratio, obtain big rear cut-off distance by less lens number.
That is, in order to ensure bigger rear cut-off distance, if the focal power of the 3rd lens combination weakens and the focal power of the 4th lens combination strengthens, then the light height in the 4th lens combination becomes big.At this moment, from the viewpoint of chromatic aberation correction, the 4th lens combination is mainly born the effect of revising the multiplying power chromatic aberation, and goes up chromatic aberation with regard to some superfluous correction by the axle of the 4th lens combination correction.
On the other hand, with regard to the 3rd lens combination, not only can keep making the multiplying power chromatic aberation be able to the state of good correction, and make that in above-mentioned the 4th lens combination be chromatic aberation on the superfluous axle of revising, be eliminated by chromatic aberation on the axle that is taken place in the 3rd little lens combination of light height.
Promptly, for the change that makes the chromatic aberation when the zoom lens change is doubly focused reduces, some revises superfluous to make a last chromatic aberation by the 4th lens combination, the positive lens of the 3rd lens combination is used the high chromatic dispersion material of the formula (1) that satisfies condition, revise the mode that chromatic aberation is eliminated by chromatic aberation on the axle that is produced in the 3rd lens combination on the superfluous axle according to some that is produced in the 4th lens combination, can obtain equilibrium.
The correction of such chromatic aberation is applicable too when the zoom lens high magnification, and the correction of the last chromatic aberation of axle that the 3rd lens combination is born and the axle that the 4th lens combination is born are gone up the equilibrium of the correction of chromatic aberation and can be regulated, thereby, can in high magnification and heavy caliber ratio, obtain big rear cut-off distance by less lens number.
Relative therewith, constitute this zoom lens if exceed the scope of conditional (1), then the problem that the equilibrium of the correction of the correction of chromatic aberation and multiplying power chromatic aberation can not be guaranteed on the axle can produce.
Description of drawings
Figure 1A is the sectional view that the summary of the camera head of the expression zoom lens that possesses embodiment of the present invention constitutes;
Figure 1B is the figure that expression each state the when zoom lens at camera head is set in wide-angle side and telescope end compares;
Fig. 2 A is the sectional view that the summary of the zoom lens of expression embodiment 1 constitutes;
Fig. 2 B is the figure that expression each state the when zoom lens at embodiment 1 is set in wide-angle side and telescope end compares;
Fig. 3 A is the sectional view that the summary of the zoom lens of expression embodiment 2 constitutes;
Fig. 3 B is the figure that expression each state the when zoom lens at embodiment 2 is set in wide-angle side and telescope end compares;
Fig. 4 A is the sectional view that the summary of the zoom lens of expression embodiment 3 constitutes;
Fig. 4 B is the figure that expression each state the when zoom lens at embodiment 3 is set in wide-angle side and telescope end compares;
Fig. 5 A is the sectional view that the summary of the zoom lens of expression embodiment 4 constitutes;
Fig. 5 B is the figure that expression each state the when zoom lens at embodiment 4 is set in wide-angle side and telescope end compares;
Fig. 6 A is the sectional view that the summary of the zoom lens of expression embodiment 5 constitutes;
Fig. 6 B is the figure that expression each state the when zoom lens at embodiment 5 is set in wide-angle side and telescope end compares;
Fig. 7 A is the sectional view that the summary of the zoom lens of expression embodiment 6 constitutes;
Fig. 7 B is the figure that expression each state the when zoom lens at embodiment 6 is set in wide-angle side and telescope end compares;
Fig. 8 A is the sectional view that the summary of the zoom lens of expression embodiment 7 constitutes;
Fig. 8 B is the figure that expression each state the when zoom lens at embodiment 7 is set in wide-angle side and telescope end compares;
Fig. 9 is the figure of various aberrations of the zoom lens of expression embodiment 1;
Figure 10 is the figure of various aberrations of the zoom lens of expression embodiment 2;
Figure 11 is the figure of various aberrations of the zoom lens of expression embodiment 3;
Figure 12 is the figure of various aberrations of the zoom lens of expression embodiment 4;
Figure 13 is the figure of various aberrations of the zoom lens of expression embodiment 5;
Figure 14 is the figure of various aberrations of the zoom lens of expression embodiment 6;
Figure 15 is the figure of the various aberrations of zoom lens of expression embodiment 7
Figure 16 is the figure that the video camera that zoom lens of the present invention constituted is used in expression.
Symbol description
G1: first lens combination
G2: second lens combination
G3: the 3rd lens combination
G4: the 4th lens combination
L31: the 3rd group of first lens
L32: the 3rd group of second lens
Embodiment
Below, with reference to description of drawings zoom lens of the present invention and possess the camera head of this zoom lens.
Figure 1A, Figure 1B are that expression possesses the sectional view that the summary of the camera head of zoom lens of the present invention constitutes, Figure 1A is illustrated in the figure that zoom is set the state when wide-angle side in detail, and Figure 1B is the figure that expression compares respectively the state when the zoom setting schedules wide-angle side and telescope end.The figure by (W) expression among Figure 1B is the state when zoom is set due to wide-angle side, and the figure by (T) expression among Figure 1B is the state when zoom is set due to telescope end.
The plant bulk of illustrated camera head 200 is little, having big rear cut-off distance (being also referred to as the rear side focal length), is to be equipped with in the TV broadcast of the zoom lens 100 of the 3 plates shootings high magnification heavy caliber ratio that mode was suitable for that has used colour splitting prism with employed camera heads such as video cameras.
This zoom lens 100 is imaged on the sensitive surface 210J of the imaging apparatus 210 that is made of CCD and CMOS etc. the optical image Hk of expression subject H.In addition, the zoom lens 100 of this high magnification heavy caliber ratio can obtain big rear cut-off distance by less lens number.
The imaging apparatus 210 that camera head 200 is disposed, will be by zoom lens 100 the optical image Hk of the expression subject H of imaging be transformed to electric signal, and will represent the picture signal Pk output of this optical image Hk.
As hypothesis, this zoom lens 100 is set due to telescope end when zoom is set the zone line that schedules telescope end and wide-angle side from zoom, and the convergent-divergent diameter is controlled.
The basic comprising of zoom lens at first, is described.
(basic comprising of zoom lens and effect thereof, effect)
In addition, each optical parameter Cg1, the Cg2 that is made of planopaallel plate is configured in: constitute the most close as the picture side of the lens that side disposed and have the plus or minus refracting power and the object side of sensitive surface 210J of zoom lens 100.
The 3rd lens combination G3 is made of towards object side and these 2 of the 3rd group of second lens L32 that have negative refraction power the 3rd group of first lens L31 with positive refracting power, concave surface.In addition, preferably have the 3rd group of first lens of positive refracting power and concave surface, dispose by said sequence from object side towards object side and the 3rd group of second lens that have negative refraction power.
The 4th lens combination G4 has 1 negative lens (at this, being lens L42) and the positive lens more than 2 (at this, being lens L41, L43, L44).
In addition, zoom lens 100 is the Abbe number of benchmark when being made as vd31 the formation optics of the 3rd group of first lens with the d line, the formula that satisfies condition (1): 16＜vd31＜35.
In addition, rear cut-off distance is to the distance of rear side focus from the summit of the last lens face of zoom lens 100.At this, rear cut-off distance and the most close corresponding to the distance of the sensitive surface 210J that makes optical image Hk imaging as the lens with plus or minus refracting power (lens L44) that side disposed as the side lens face from constituting zoom lens 100.
(formation that the basic comprising of zoom lens further limits)
Secondly, inscape that above-mentioned basic comprising that illustrated zoom lens 100 and camera head 200 are possessed further limits and effect thereof, effect are described.In addition, these inscapes that basic comprising is further limited not necessarily constitute with regard to zoom lens 100 of the present invention and camera head 200.
In addition, though zoom lens 100 of the present invention and camera head 200 satisfies the whole of inscape that above-mentioned basic comprising is further limited, zoom lens of the present invention both can satisfy to these basic comprisings further only in the inscape of qualification, also can satisfy plural combination.
At first, the meaning of each parameter that will be represented by mark in conditional (2)～(7) is summarized as follows.
F3 is the focal length of the 3rd lens combination integral body
F4 is the focal length of the 4th lens combination integral body
Ft is the focal length of the zoom lens total system when zoom is set due to telescope end
F31 is the focal length of the 3rd group of first lens
Vd32 is the Abbe number of benchmark for the optics that forms the 3rd group of second lens with the d line
Vd4p be in the formation optics of each positive lens of being disposed of the 4th lens combination, be that the Abbe number of benchmark is the Abbe number of the optics of maximum with the d line
D is the 3rd group of first lens on optical axis and the interval (airspace) of the 3rd group of second lens
TL3 is the thickness of the 3rd lens combination integral body on optical axis
F2 is the focal length of second lens combination
Fw is the focal length of the zoom lens total system when zoom is set due to wide-angle side
The formation that ◇ further limits conditional (1)
The relevant qualification of ◇ conditional (2) constitutes
With conditional (2): 2.8＜f3/f4＜12.0 and preferred conditional (2 '): 3.0＜f3/f4＜11.5, be defined as the ratio of the focal distance f 4 of the focal distance f 3 of the 3rd lens combination G3 and the 4th lens combination G4, be the maximization of the follow-up lens combination that is used for preventing that not only the 3rd lens combination G3 is later, and guarantee enough big rear cut-off distance and make the condition that penetrates pupil location in enough distant places.
If the mode with the lower limit that is lower than conditional (2) constitutes zoom lens 100, then produce following problem: the focal power grow of the 3rd lens combination G3, when being difficult to suppress to become times and the change of the spherical aberration (also claiming spherical aberration) during focusing, be difficult to obtain being used for to insert the enough big rear cut-off distance of color separation optical system and various filter class (, being optical parameter Cg1, Cg2) simultaneously at this.In addition, if the focal power of the 4th lens combination G4 is died down compensate and the amount of movement of the 4th lens combination G4 increased, when then becoming times and the change of the various aberrations during focusing become big, so will not be preferred.
In addition, in contrast, if the mode with the upper limit that is higher than conditional (2) constitutes zoom lens 100, then become big, and the diameter that makes the diameter of the 4th lens combination G4 promptly constitute the lens of the 4th lens combination G4 becomes big problem and exists owing to pass the emitted beam diameter of the 3rd lens combination G3 (beam diameter of dispersing).
In addition, if constitute zoom lens 100, then can suppress the generation of this problem in the mode of formula of satisfying condition (2) or conditional (2 ').In addition, constitute zoom lens 100, the lens peculiarity of further wishing in the time of then can obtaining than the formula of satisfying condition (2) as if mode with the formula of satisfying condition (2 ').
The relevant qualification of ◇ conditional (3) constitutes
Conditional (3): the relation of the focal distance f 4 of 0.2＜f4/ft＜0.5 and the conditional (3 ') of more wishing: 0.2＜f4/ft＜0.4 regulation the 4th lens combination G4 and the focal distance f t of the zoom lens total system when zoom is set due to telescope end.
If the mode with the lower limit that is lower than conditional (3) constitutes zoom lens 100, then the focal power of the 4th lens combination G4 became strong, and the problem that is difficult to suppress the spherical aberration that the 4th lens combination G4 produced can produce.
In addition, in contrast, if the mode with the upper limit that surpasses conditional (3) constitutes zoom lens 100, then the focal power of the 4th lens combination G4 dies down, mobile quantitative change in the time of for this is compensated the 4th lens combination G4 being become times is big, becoming under the big situation of multiple proportions, the whole problem that maximizes of lens system can produce.
In addition, if constitute zoom lens 100, then can suppress the generation of this problem in the mode of formula of satisfying condition (3) or conditional (3 ').In addition, constitute zoom lens 100, the lens peculiarity of further wishing in the time of then can obtaining than the formula of satisfying condition (3) as if mode with the formula of satisfying condition (3 ').
The relevant qualification of ◇ conditional (4) constitutes
Conditional (4): the focal distance f 31 of the 3rd group of first lens L31 among 0.2＜f31/f3＜0.7 and preferred conditional (4 '): 0.25＜f31/f3＜0.6 regulation the 3rd lens combination G3 and the ratio of the 3rd lens combination G3 whole focal length f3.
If the mode with the lower limit that is lower than conditional (4) constitutes zoom lens 100, the focal power grow of the 3rd group of first lens L31 then, and make various aberrations especially the problem of high order spherical aberration correction deficiency can produce.
In addition, in contrast, if the mode with the upper limit that surpasses conditional (4) constitutes zoom lens 100, then the focal power of the 3rd group of first lens L31 dies down, and the ratio of the negative focal power that the 3rd lens combination G3 is had increases and problem that curvature of the image and astigmatism are increased can produce.
In addition, if constitute zoom lens 100, then can suppress the generation of this problem in the mode of formula of satisfying condition (4) or conditional (4 ').In addition, constitute zoom lens 100, the lens peculiarity of further wishing in the time of then can obtaining than the formula of satisfying condition (4) as if mode with the formula of satisfying condition (4 ' 〉.
The relevant qualification of ◇ conditional (5) constitutes
Conditional (5): ν d32-ν d31＜30 and most preferred conditional (5 '): the 3rd group of first lens L31 among ν d32-ν d31＜28 regulation the 3rd lens combination 3G and the Abbe number of the 3rd group of second lens L32 poor.
If the mode with the upper limit that surpasses conditional (5) constitutes zoom lens 100, then axle is gone up the problem that chromatic aberation increases and can be produced.
In addition, if constitute zoom lens 100, then can suppress the generation of this problem in the mode of formula of satisfying condition (5) or conditional (5 ').In addition, constitute zoom lens 100, the lens peculiarity of further wishing in the time of then can obtaining than the formula of satisfying condition (5) as if mode with the formula of satisfying condition (5 ').
The relevant qualification of ◇ the 4th lens combination constitutes
The 4th lens combination G4 can be made of 1 negative lens (lens L42) and 3 positive lenss (lens L41, L43, L44).If constitute the 4th lens combination G4 by this way, even then under the big situation of the change multiple proportions of zoom lens 100, the change of the various aberrations that produce in the time of also can being suppressed at this zoom lens 100 and becoming times and during focusing.
In addition, the 4th lens combination G4 can adopt by the positive simple lens that disposes successively from object side (lens L41), engage the structure of 3 groups of 4 formations of lens (lens L42, L43), positive simple lens (lens L44).If constitute the 4th lens combination G4 by this way, then with above-mentioned same, even under the very large situation of change multiple proportions of zoom lens 100, the change of the various aberrations that produce in the time of also can being suppressed at this zoom lens 100 and becoming times and during focusing.
The relevant qualification of ◇ conditional (6) constitutes
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 disposed, use with the d line and be the Abbe number in the lens (for example, lens L43) of the optics of the Abbe number maximum of benchmark.
If at least 1 positive lens (for example, lens L43) adopts the low chromatic dispersion material of satisfy condition formula (6) or conditional (6 '), then can be as mentioned above the equilibrium of chromatic aberation correction and the correction of multiplying power chromatic aberation on the retainer shaft well.
In addition, constitute zoom lens 100, the lens peculiarity of further wishing in the time of then can obtaining than the formula of satisfying condition (6) as if mode with the formula of satisfying condition (6 ').
The relevant qualification of ◇ conditional (7) constitutes
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) of being disposed among the 3rd lens combination G3 has carried out the formula after the normalization by the 3rd lens combination G3 integral thickness TL3.
In addition, the interval d of 2 lens (lens L31, L32) is the interval on optical axis (airspace) of lens face of the object side of the lens face of picture side of the 3rd group of first lens (lens L31) and the 3rd group of second lens (lens L32), and the thickness T L3 of the 3rd lens combination G3 integral body is the distance on optical axis from the lens face of the picture side of three group of second lens of lens face to the (lens L32) of the object side of the 3rd group of first lens (lens L31).
If the mode with the lower limit that is lower than conditional (7) constitutes zoom lens 100, then the principal point position can not be near object side, and the problem that zoom lens is maximized can produce.
In addition, in contrast, if constitute zoom lens 100 in the mode of the upper limit that surpasses conditional (7), then amber cuts down now and becomes big at minus side, is difficult to obtain good image planes characteristic.
In addition, be extended to the scope shown in conditional (7) or conditional (7 ') and constitute zoom lens 100 by airspace in the mode of formula of satisfying condition (7) or conditional (7 ') with 2 lens (lens L31, L32), the more close object side in principal point position of the 3rd lens combination G3 can be made, and then the lens combination miniaturization can be made.
In addition, if constitute zoom lens 100, then can make the close object side in principal point position of above-mentioned the 3rd lens combination G3, and then can make lens combination miniaturization more than the formula of satisfying condition (7) Shi Gengke in the mode of the formula of satisfying condition (7 ').
The relevant qualification of ◇ the 3rd lens combination constitutes
All lens faces (lens L31, L32) that constitute the 3rd lens combination G3 can be made sphere.
All make sphere by the lens face (lens L31, L32) that will constitute the 3rd lens combination G3, can make the realization cost degradation easy to manufacture of lens, simultaneously, the performance degradation that causes because of foozle and assembly error is dwindled.
The relevant qualification of ◇ the 4th lens combination constitutes
Can (lens L41～L44) makes sphere with all lens faces of constituting the 4th lens combination G4.
(lens L41～L44) all make sphere can make the easy to manufacture of lens and realize cost degradation lens face by will constituting the 4th lens combination G4, simultaneously, the performance degradation that causes because of foozle and assembly error is reduced.
The relevant qualification of ◇ conditional (8) constitutes
Conditional (8): 0.4＜| f2|/(fwft)
1/2＜0.8 and preferred conditional (8 '): 0.42＜| f2|/(fwft)
1/2The relation of the focal distance f t of the focal distance f w of the focal length of＜0.75 regulation second lens combination G2, zoom lens 100 total systems when zoom is set due to wide-angle side, zoom lens 100 total systems when zoom is set due to telescope end.
If the mode with the lower limit that is lower than conditional (8) constitutes zoom lens 100, then the focal power of the second lens combination G2 is strong excessively, and the problem that the allowance of the problem of correction difficulty of curvature of the image and coma and foozle is diminished produces.
In addition, the allowance of so-called foozle diminishes, and is meant that the sensitivity (susceptibility or performance degradation susceptibility) of the performance degradation that is caused by mismachining tolerance and assembly error etc. becomes the big meaning.If the allowance of foozle diminishes, then the deterioration for mismachining tolerance and assembly error sensitivity and performance becomes remarkable.On the other hand, if the permission quantitative change of foozle is greatly that the performance degradation susceptibility diminishes, the degradation of the performance that is caused by mismachining tolerance and assembly error is slowed up.
In addition, in contrast, if constitute zoom lens 100 in the mode of the upper limit that surpasses conditional (8), then the mobile quantitative change of the second lens combination G2 is big, and the light height that passes the first lens combination 1G simultaneously becomes big, and the zoom lens 100 whole problems that maximize are produced.
In addition, if constitute zoom lens 100, then can suppress the generation of this problem in the mode of formula of satisfying condition (8) or conditional (8 ').In addition, constitute zoom lens 100, the lens peculiarity of further wishing in the time of then accessing than the formula of satisfying condition (8) as if mode with the formula of satisfying condition (8 ').
The relevant qualification of ◇ second lens combination constitutes
The second lens combination G2 can be made of 3 negative lenses (at this, being lens L21, L22, L24) and 1 positive lens (is lens L23 at this).If constitute the second lens combination G2 by this way, then because the second lens combination G2 has 3 negative lenses, thereby the position of object side principal point that can make the second lens combination G2 integral body is near object side, and then the principal point interval of shortening the first lens combination G1 and the second lens combination G2, the height that the axle outer light beam can be passed the first lens combination G1 keeps lowly, thereby, can suppress the maximization of the first lens combination G1.
The relevant qualification of ◇ second lens combination constitutes
The second lens combination G2 can dispose successively from object side: have negative refraction power second group of first lens (lens L21), have negative refraction power second group of second lens (lens L22), have second group of the 3rd lens (lens L23) of positive refracting power, second group of the 4th lens (lens L24) with negative refraction power.If constitute the second lens combination G2 like this, then can dispose 2 negative lenses continuously and negative focal power is concentrated at the object side among the second lens combination G2, and the height that the axle outer light beam is passed the first lens combination G1 keeps lowlyer, thereby, can suppress the maximization of the first lens combination G1.
(specific embodiment)
Below, with reference to Fig. 2 A, 2B ... explanation is concluded about embodiment 1～7 numeric data separately of zoom lens of the present invention etc. in 8A, 8B, table 1～8.In addition, with Figure 1A of the above-mentioned zoom lens 100 of expression, among the 1B the corresponding to Fig. 2 A of symbol, 2B ... the formation that symbolic representation among 8A, the 8B corresponds to each other.
Fig. 2 A, 2B ... 8A, 8B are the sectional views that the zoom lens summary separately of expression embodiment 1～7 constitutes.
Fig. 2 A, 3A ... 8A is that expression in detail is with the figure of zoom setting due to the state of telescope end, Fig. 2 B, 3B ... 8B is that expression is to setting the figure that state that schedules wide-angle side and the state that schedules telescope end compare at zoom.The figure by (W) expression among Fig. 2 B～Fig. 8 B sets the state that schedules wide-angle side with zoom, and the figure by (T) expression among Fig. 2 B～Fig. 8 B is with the state of zoom setting due to telescope end.
In addition, Fig. 2 A, 3A ... L1, L2 shown in each figure of 8A ... symbol is meant the symbol of each lens, and is corresponding with the order of the lens that are arranged in order from object side.Wherein, symbol L31, L32 are not corresponding with the lens order that is arranged in order from object side, and symbol L31 represents the 3rd group of first lens, and symbol L32 represents the 3rd group of second lens.In addition, the symbol L21～L24 among Figure 1A, the 1B represents the lens in second group, and symbol L41～L44 represents the lens in the 4th group.
In addition, about at the lens number that comprises under the situation that engages lens, will engage the joint lens that form,, and its lens number be counted as what constitute by n sheet lens by making n sheet lens.
Table 1～8th, the figure of the zoom lens master data separately of expression embodiment 1～7.Top during table 1～7 are respectively shown (representing with symbol (a) among the figure) expression lens data, the summary specification of bottom (using symbol (b) to represent among the figure) expression zoom lens.
In addition, all lens faces that constitute the zoom lens among these embodiment all are sphere or plane.
In addition, expression is about the zoom lens of embodiment 1～7 in the table 8, by conditional (1)～(8) inequality separately determine scope each value (in each embodiment determined by the calculating of the calculating formula in the inequality value or with inequality in the corresponding value of constant of the zoom lens optical system represented by mark).
In addition, as hypothesis, these zoom lens are set due to telescope end when zoom is set zone line due to telescope end and wide-angle side from zoom, to the convergent-divergent diameter of aperture diaphragm with assemble (
The mode system of restriction り Write む) is imperial.With this convergent-divergent diameter being that mode about F2.9 is controlled at telescope end.
In each lens data on table 1～7 tops, face sequence number Si represent along with i number that increases successively towards the picture side from the most close object side (i=1,2,3 ...) the sequence number of lens face etc.In addition, also comprising aperture diaphragm St in these lens datas is also put down in writing.
Radius of curvature R i represent i number (i=1,2,3 ...) radius-of-curvature of face, face interval D i (i=1,2,3 ...) expression i face and ten No. 1 faces of i the face on optical axis Z1 at interval.The symbol Si of the symbol Ri of lens data and symbol Di and expression lens face etc. (i=1,2,3 ...) corresponding.
In addition, face interval D i (i=1,2,3 ...) situation of hurdle record presentation surface numeral at interval and the situation that records symbol Dn (n is a numerical value) exist, it is corresponding with the face interval (airspace) between lens combination wherein to record symbol Dn part, and these faces (airspace) at interval change along with the change of zoom ratio.
Ndj represent about along with from object side towards j number that increases successively as side (j=1,2,3 ...) refractive index to wavelength 587.6nm (d line) of optical parameter, what ν dj represented the j optical parameter is the Abbe number of benchmark with the d line.
In the lens data of table 1～7, radius-of-curvature and face unit at interval is mm, with regard to radius-of-curvature, under object side is protruding situation, just be made as, as side be made as under the protruding situation negative.
In addition, the bottom of table 1～7 is illustrated in each value of wide-angle side and telescope end by the hurdle of symbol (b) expression, that is, f is the focal length (mrn of unit) of lens total system, and Fno is the F number, and 2 ω are full visual angle, and Dg, D15, D20, D27 etc. are the interval between each lens combination.
In addition, expression is concluded at last in the explanation of " the specific embodiment of the present invention " in table 1～8.
In addition, Fig. 9～15th, the figure of the various aberrations of each zoom lens of expression embodiment 1～embodiment 7.Represented the relevant aberration of each light among the figure with wavelength 587.6nrn, wavelength 460.0nm, wavelength 615.0nm.
The figure that represented pairing each aberration diagram of symbol (A)～(D) is a wide-angle side among each figure of above-mentioned Fig. 9～Figure 15, represent respectively spherical aberration (also claiming spherical aberration) (A), astigmatism (also claiming astigmatism) (B), the distortion (distortion aberration) (C), ratio chromatism, (chromatic aberation of multiplying power) (D).In addition, the figure that pairing each aberration diagram of the symbol shown in each figure (E)～(H) is a telescope end, represent respectively spherical aberration (E), astigmatism (F), distortion (distortion aberration) (G), ratio chromatism, (chromatic aberation of multiplying power) (H).
In addition, among the distortion figure, (be variable, 0≤θ≤ω), desirable image height is made as f * tan θ, represents the side-play amount apart from it to use the focal distance f, half angle of view θ of lens total system.
Learn that according to numeric data relevant and aberration diagram etc. the zoom lens and the camera head of high magnification of the present invention and heavy caliber ratio can be realized big rear cut-off distance by few lens number with embodiment 1～7.
Figure 16 is the pie graph that the video camera of one of camera head that zoom lens of the present invention constituted example is used in expression.In addition, in Figure 16, go back the first lens combination G1, the second lens combination G2, aperture diaphragm St, the 3rd lens combination G3, the 4th lens combination G4 that summary has represented that zoom lens 1 possesses.
Illustrated video camera 10 is the camera head of so-called 3CCD mode with 3 imaging apparatuss, still, camera head of the present invention is not limited thereto, also can be for by 1 imaging apparatus the long frequency band of all-wave being made a video recording.Video camera 10 possesses: zoom lens 1; Zoom lens 1 as wave filter 2 that side disposed with functions such as low-pass filter and infrared ray cut off filter; Wave filter 2 as colour splitting prism 3R, 3G, 3B that side disposed; At the end face of each colour splitting prism set imaging apparatus 4R, 4G, 4B; Signal processing circuit 5. Imaging apparatus 4R, 4G, 4B will be transformed to electric signal by the optical image that zoom lens 1 forms, and for example can use CCD (Charge Coupled Device ).Imaging apparatus 4R, 4G, 4B dispose with the corresponding to mode of imaging surface of the optical image of all kinds that forms by zoom lens 1 respectively according to its shooting face.
See through the light of zoom lens 1, will not need light component to remove by wave filter 2 after, be broken down into each coloured light of red, green, blue by colour splitting prism 3R, 3G, 3B, and imaging on the shooting face of imaging apparatus 4R, 4G, 4B.From imaging apparatus 4R, the 4G corresponding, the output signal of 4B, carry out calculation process and be generated colour picture signal by signal processing circuit 5 with each coloured light of red, green, blue.Generate and the colour picture signal of output is imported into indication device 6 and shows not by signal processing circuit 5.
In addition, the invention is not restricted to the various embodiments described above, in the scope of the main idea that does not change invention, can implement various distortion.For example, the value of the radius-of-curvature of each lens, face interval and refractive index etc. is not limited to the numerical value of expression in above-mentioned each table, can obtain other value.
[table 1]
Fno. the numerical value in () is the situation that does not have the convergent-divergent restriction.
[table 2]
Fno. the numerical value in () is the situation that does not have the convergent-divergent restriction.
[table 3]
Fno. the numerical value in () is the situation that does not have the convergent-divergent restriction.
[table 4]
Fno. the numerical value in () is the situation that does not have the convergent-divergent restriction.
[table 5]
Fno. the numerical value in () is the situation that does not have the convergent-divergent restriction.
[table 6]
Fno. the numerical value in () is the situation that does not have the convergent-divergent restriction.
[table 7]
Fno. the numerical value in () is the situation that does not have the convergent-divergent restriction.
[table 8]
Claims (21)
1. a zoom lens is characterized in that,
Have successively from object side: that be fixed with respect to optical axis direction and first lens combination that have positive refracting power when becoming times, move when becoming times and make that change and second lens combination that have negative refraction power of multiplying power, that be fixed with respect to optical axis direction and the 3rd lens combination that have positive refracting power when becoming times, move the 4th lens combination that the change of the image planes position that described change is doubly followed is revised and focused and have positive refracting power when becoming times
Described the 3rd lens combination is made of the 3rd group of first lens and the 3rd group of these two on second lens, and described the 3rd group of first lens have positive refracting power, and described the 3rd group of second lens make concave surface towards object side and have negative refraction power,
Described the 4th lens combination has negative lens and the positive lens more than two,
And, satisfy following conditional (1):
16＜νd31＜35…(1)
Wherein, ν d31 be the 3rd group of first lens the formation optics be the Abbe number of benchmark with the d line.
2. zoom lens as claimed in claim 1 is characterized in that,
Satisfy following conditional (2):
2.8＜f3/f4＜12.0…(2)
Wherein,
F3 is the focal length of the 3rd lens combination,
F4 is the focal length of the 4th lens combination.
3. zoom lens as claimed in claim 1 is characterized in that,
Satisfy following conditional (3)
0.2＜f4/ft＜0.5…(3)
Wherein,
Ft is the focal length of the zoom lens total system when zoom is set due to telescope end,
F4 is the focal length of the 4th lens combination.
4. zoom lens as claimed in claim 1 is characterized in that,
Satisfy following conditional (4):
0.2＜f31/f3＜0.7…(4)
Wherein,
F31 is the focal length of the 3rd group of first lens,
F3 is the focal length of the 3rd lens combination.
5. zoom lens as claimed in claim 1 is characterized in that,
Satisfy following conditional (5)
νd32-νd31＜30…(5)
Wherein,
ν d32 be the 3rd group of second lens the formation optics be the Abbe number of benchmark with the d line.
6. zoom lens as claimed in claim 1 is characterized in that,
Described the 4th lens combination is made of three positive lenss and a slice negative lens.
7. zoom lens as claimed in claim 1 is characterized in that,
Described the 4th lens combination by the positive simple lens that disposes successively from object side, engage lens, positive signal-lens such 3 groups 4 and constitute.
8. zoom lens as claimed in claim 6 is characterized in that,
Satisfy following conditional (6):
60＜νd4p…(6)
Wherein,
ν d4p be in the formation optics separately of the positive lens that disposed of the 4th lens combination, be that the Abbe number of benchmark is the Abbe number of the optics of maximum with the d line.
9. zoom lens as claimed in claim 1 is characterized in that,
Satisfy following conditional (7):
0.2＜d/TL3＜0.8…(7)
Wherein,
D is the interval on optical axis (airspace) of the 3rd group of first lens and the 3rd group of second lens,
TL3 is the thickness on optical axis of the 3rd lens combination integral body.
10. zoom lens as claimed in claim 1 is characterized in that,
All lens faces that constitute described the 3rd lens combination are sphere.
11. zoom lens as claimed in claim 1 is characterized in that,
All lens faces that constitute described the 4th lens combination are sphere.
12. zoom lens as claimed in claim 1 is characterized in that,
Satisfy following conditional (8):
0.4＜|f2|/(fw·ft)
1/2＜0.8…(8)
Wherein,
F2 is the focal length of second lens combination,
Fw is the focal length of the zoom lens total system when zoom is set due to wide-angle side,
Ft is the focal length of the zoom lens total system when zoom is set due to telescope end.
13. zoom lens as claimed in claim 1 is characterized in that,
Described second lens combination is made of 3 negative lenses and 1 positive lens.
14. zoom lens as claimed in claim 1 is characterized in that,
Described second lens combination disposes successively from object side: have negative refraction power second group of first lens, have negative refraction power second group of second lens, have second group of the 3rd lens of positive refracting power, second group of the 4th lens with negative refraction power.
15. zoom lens as claimed in claim 2 is characterized in that,
Satisfy following conditional (3):
0.2＜f4/ft＜0.5…(3)
Wherein,
Ft is the focal length of the zoom lens total system when zoom is set due to telescope end,
F4 is the focal length of the 4th lens combination.
16. zoom lens as claimed in claim 15 is characterized in that,
Satisfy following conditional (4):
0.2＜f31/f3＜0.7…(4)
Wherein,
F31 is the focal length of the 3rd group of first lens,
F3 is the focal length of the 3rd lens combination.
17. zoom lens as claimed in claim 16 is characterized in that,
Satisfy following conditional (5):
νd32-νd31＜30…(5)
Wherein,
ν d32 be the 3rd group of second lens the formation optics be the Abbe number of benchmark with the d line.
18. zoom lens as claimed in claim 17 is characterized in that,
Described the 4th lens combination is made of 3 positive lenss and 1 negative lens.
19. zoom lens as claimed in claim 18 is characterized in that,
Described the 4th lens combination by the positive simple lens that disposes successively from object side, engage such 3 groups 4 of lens, positive simple lens and constitute.
20. zoom lens as claimed in claim 7 is characterized in that,
Satisfy following conditional (6):
60＜νd4p…(6)
Wherein,
ν d4p be in the formation optics separately of the positive lens that disposed of the 4th lens combination, be that the Abbe number of benchmark is the Abbe number of the optics of maximum with the d line.
21. a camera head is characterized in that, possesses the described zoom lens of claim 1.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2010135907A JP5491292B2 (en) | 2010-06-15 | 2010-06-15 | Zoom lens and imaging device |
| JP2010-135907 | 2010-06-15 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102289057A true CN102289057A (en) | 2011-12-21 |
| CN102289057B CN102289057B (en) | 2015-01-14 |
Family
ID=45335602
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110158542.8A Expired - Fee Related CN102289057B (en) | 2010-06-15 | 2011-06-14 | Zoom lens and imaging device |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP5491292B2 (en) |
| CN (1) | CN102289057B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105143950A (en) * | 2013-06-21 | 2015-12-09 | 奥林巴斯株式会社 | Zoom lens and image capture device comprising same |
| CN106501924A (en) * | 2015-09-07 | 2017-03-15 | 富士胶片株式会社 | Zoom lens and camera head |
| CN109143554A (en) * | 2018-10-12 | 2019-01-04 | 舜宇光学(中山)有限公司 | A kind of zoom lens |
| CN109143554B (en) * | 2018-10-12 | 2024-05-28 | 舜宇光学(中山)有限公司 | Zoom lens |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6418893B2 (en) | 2014-10-21 | 2018-11-07 | キヤノン株式会社 | Zoom lens and imaging apparatus having the same |
| JP6812101B2 (en) * | 2015-12-18 | 2021-01-13 | 株式会社タムロン | Optical system and imaging device |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06317750A (en) * | 1993-04-30 | 1994-11-15 | Canon Inc | Rear focus type zoom lens |
| JPH08179206A (en) * | 1994-12-20 | 1996-07-12 | Matsushita Electric Ind Co Ltd | Zoom lens and video camera using the same |
| US5966245A (en) * | 1995-08-30 | 1999-10-12 | Olympus Optical Co., Ltd. | Zoom lens system |
| US20070217026A1 (en) * | 2006-03-17 | 2007-09-20 | Kazuya Nishimura | Bent type zoom optical system, and imager, information processor and electronic camera apparatus incorporating the same |
| CN100360981C (en) * | 2004-04-20 | 2008-01-09 | 索尼株式会社 | Zoom lens and imaging device |
-
2010
- 2010-06-15 JP JP2010135907A patent/JP5491292B2/en not_active Expired - Fee Related
-
2011
- 2011-06-14 CN CN201110158542.8A patent/CN102289057B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06317750A (en) * | 1993-04-30 | 1994-11-15 | Canon Inc | Rear focus type zoom lens |
| JPH08179206A (en) * | 1994-12-20 | 1996-07-12 | Matsushita Electric Ind Co Ltd | Zoom lens and video camera using the same |
| 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 |
| US20070217026A1 (en) * | 2006-03-17 | 2007-09-20 | Kazuya Nishimura | Bent type zoom optical system, and imager, information processor and electronic camera apparatus incorporating the same |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105143950A (en) * | 2013-06-21 | 2015-12-09 | 奥林巴斯株式会社 | Zoom lens and image capture device comprising same |
| CN106501924A (en) * | 2015-09-07 | 2017-03-15 | 富士胶片株式会社 | Zoom lens and camera head |
| CN106501924B (en) * | 2015-09-07 | 2020-07-03 | 富士胶片株式会社 | Zoom lens and imaging device |
| CN109143554A (en) * | 2018-10-12 | 2019-01-04 | 舜宇光学(中山)有限公司 | A kind of zoom lens |
| CN109143554B (en) * | 2018-10-12 | 2024-05-28 | 舜宇光学(中山)有限公司 | Zoom lens |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102289057B (en) | 2015-01-14 |
| JP5491292B2 (en) | 2014-05-14 |
| JP2012002902A (en) | 2012-01-05 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5966246A (en) | Zoom lens of the inner focusing type | |
| CN101276044B (en) | Zoom lens and image pickup apparatus | |
| US10295807B2 (en) | Zoom lens and imaging apparatus | |
| JP3376171B2 (en) | Zoom lens | |
| CN103443686A (en) | Variable power optical system and image capture device | |
| US8654449B2 (en) | Zoom lens and image projection apparatus including the same | |
| US7085069B2 (en) | Large zoom ratio zoom lens | |
| US8665528B2 (en) | Zoom lens and image pickup apparatus having the same | |
| JP2006243355A (en) | Zoom lens and imaging apparatus | |
| CN103403603B (en) | Zoom lens and imaging device | |
| US20080106790A1 (en) | Zoom lens, still image camera comprising the zoom lens, and video camera comprising the zoom lens | |
| JPH05264902A (en) | Zoom lens | |
| JPH0990221A (en) | High-power zoom lens | |
| CN101738710A (en) | Zoom lens and imaging apparatus | |
| JP3453007B2 (en) | Zoom lens | |
| JP2016164629A (en) | Zoom lens and image capturing device | |
| US10101568B2 (en) | Zoom lens, optical device, and method for manufacturing the zoom lens | |
| CN102289058A (en) | Zoom lens and imaging device | |
| KR20050040731A (en) | Zoom lenz | |
| CN102289057B (en) | Zoom lens and imaging device | |
| US8649106B2 (en) | Zoom lens and image pickup apparatus equipped with the zoom lens | |
| US20050270646A1 (en) | Zoom lens and video camera comprising the same | |
| US11249290B2 (en) | Zoom lens and image pickup apparatus including the same | |
| US11243385B2 (en) | Zoom lens and image pickup apparatus having the same | |
| US9140882B2 (en) | Zoom lens, optical apparatus, and method for manufacturing the zoom lens |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150114 Termination date: 20180614 |