CN101726841B - Zoom lens and camera device - Google Patents
Zoom lens and camera device Download PDFInfo
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- CN101726841B CN101726841B CN2009101731944A CN200910173194A CN101726841B CN 101726841 B CN101726841 B CN 101726841B CN 2009101731944 A CN2009101731944 A CN 2009101731944A CN 200910173194 A CN200910173194 A CN 200910173194A CN 101726841 B CN101726841 B CN 101726841B
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Abstract
The invention provides a zoom lens in small structure with good optical performance in low cost. The zoom lens comprises a first positive lens set (G1), a second negative lens set (G2) capable of moving to zoom, a diaphragm, a third positive lens set (G3), a fourth positive lens set (G4) for correcting and focusing the image surface position following with zooming, which are arranged in turn from object side. The second lens set (G2) at least comprises two negative lens. A plastic aspherical lens is arranged at the position most closed to the image side of the second lens set (G2). The focal length of the plastic aspherical lens is f2a and the focal length of the second lens set (G2) is f2 and the following conditions are satisfied: 2.4<absolute value of f2a/f2<10.0...(1).
Description
Technical field
The present invention relates to zoom lens and camera head, relate to zoom lens that can suitably be used for video camera or electronic still video camera, surveillance camera etc. and the camera head that possesses these zoom lens in more detail.
Background technology
Past is as being used for civilian video camera or monitoring that the zoom lens with video camera etc. propose 4 groups of formulas or 5 groups of formula zoom lens mostly.And, as miniaturization and the requirement of the high performance scheme that can respond, proposed to use the zoom lens of non-spherical lens to these.In 4 groups of formulas in above-mentioned field, 5 groups of formula zoom lens, use the example of non-spherical lens very many at the positive lens of the 3rd lens combination.
As other example, as described in patent documentation 1～3, have in 4 groups of formula zoom lens and become the example that the 2nd lens combination of group is doubly used non-spherical lens.Record from thing side the 2nd lens combination successively at patent documentation 1, will be made as the example of non-spherical lens from the 2nd negative lens of thing side by negative, negative, positive 3 chip architectures that constitute.Record from thing side the 2nd lens combination successively at patent documentation 2, will and be made as the example of non-spherical lens as the positive lens of side from the 2nd negative lens of thing side by negative, negative, positive 3 chip architectures that constitute.Record from thing side the 2nd lens combination successively at patent documentation 3, will be made as the example of non-spherical lens by the negative lens of thing side by negative, negative, positive, negative 4 chip architectures that constitute.
Patent documentation 1: Jap.P. discloses flat 9-127417 communique
Patent documentation 2: the open 2006-171615 communique of Jap.P.
Patent documentation 3: the open 2006-113387 communique of Jap.P.
Yet,, in the zoom lens in above-mentioned field, except the requirement of miniaturization, high performance, the requirement of cost degradation is also grown to even greater heights in recent years.As seeking one of method of cost degradation, can consider to be replaced to by the non-spherical lens that glass molds applanation lens (being made of the lens that form by compression molding glass material) constitutes the technology of plastic lens (lens that constitute by plastic material).
At patent documentation 1,2 zoom lens of being put down in writing is that material with the above-mentioned non-spherical lens of the 2nd lens combination is made as plastics, will become the example that the non-spherical lens of group doubly is made as the only a few of plastic lens.
Yet, in the lens type of being put down in writing as patent documentation 1～3, make the 2nd lens combination have bigger negative focal power mostly in order to shorten the lens length overall, it is big that the focal power of each negative lens of the 2nd lens combination also becomes easily.Therefore, when the material of these negative lenses is made as plastics, exists and follow temperature variation and the variation of characteristic becomes big problem.
For example, use at the non-spherical lens that leans on the thing side to have negative focal power most in the 2nd lens combination that patent documentation 3 is put down in writing, but this power of lens is big, so be difficult to constitute this lens by plastics.
And the general refractive index of plastics is low, so exist the curvature of lens to become big and follow the foozle of lens or the performance degradation of the assembly error very large problem that becomes.If reduce the focal power of the 2nd lens combination, reduce the focal power that each negative lens of the 2nd lens combination is born, then also can constitute, but part that this moment, focal power weakened by plastics, the mobile quantitative change when making change times is big, just has the elongated problem of lens length overall.And, also cause the maximization of the diameter (in total system, leaning on the diameter of the lens of thing side most) of front lens, go with anti-its road of miniaturization.
Summary of the invention
The present invention is referred from above-mentioned situation and proposes, and its purpose is, provides a kind of and keeps small-sized and good optical performance and seek the zoom lens of cost degradation and possess the camera head of these zoom lens.
Zoom lens of the present invention possess successively from the thing side: have positive refracting power and fixing the 1st lens combination when becoming times; Has negative refracting power and by move the 2nd lens combination that becomes doubly along optical axis; Diaphragm; Has positive refracting power and fixing the 3rd lens combination when becoming times; Have positive refracting power and follow the correction of change image planes position doubly and the 4th lens combination of focusing; The 2nd lens combination comprises 2 negative lenses at least, the 2nd lens combination by being aspheric surface and the plastic aspherical element lens that constitute by plastic material as at least 1 of side configuration, the focal length of plastic aspherical element lens is made as f2a, when the focal length of the 2nd lens combination is made as f2, satisfies following conditional (1).
2.4＜|f2a/f2|＜10.0…(1)
In addition, above-mentioned f2a is the focal length of near axis area.
In addition, in the present invention, each " lens combination " not only comprises the lens combination that is made of a plurality of lens, also comprises the lens combination that only is made of 1 lens.
In zoom lens of the present invention, at least comprise 2 negative lenses by constituting the 2nd lens combination, guarantee to seek the miniaturization of lens total system in the essential negative focal power of the 2nd lens combination, by the 2nd lens combination by picture side configuration plastic aspherical element lens, seek taking into account of good optical performance and cost degradation.And, by stipulating the focal power of this plastic lens with conditional (1), suppress the performance degradation that causes by temperature variation or manufacturing/assembly error, and obtain sufficient aberration correction effect.
In zoom lens of the present invention, in the time of will being made as M2 from the amount of movement of 2nd lens combination of wide-angle side when telescope end becomes times, preferably satisfy following conditional (2).
2.5＜|M2/f2|＜3.8…(2)
In addition, in zoom lens of the present invention, the focal length of the total system of wide-angle side is made as fw, when maximum image height is made as IH, preferably satisfies following conditional (3).
1.4＜fw/IH＜2.1…(3)
And, in zoom lens of the present invention, when the focal length of the 1st lens combination is made as f1, preferably satisfy following conditional (4).
4.3＜|f1/f2|＜5.5…(4)
And, in zoom lens of the present invention, also can constitute the 2nd lens combination and comprise 1 positive lens, preferably satisfy following conditional (5) when the Abbe number of this positive lens is made as ν 2p this moment.
ν2p＜25…(5)
In zoom lens of the present invention, when the 2nd lens combination comprises 1 positive lens, when the refractive index of this positive lens is made as N2p, preferably satisfy following conditional (6).
N2p＞1.83…(6)
And in zoom lens of the present invention, the 2nd lens combination constitutes by 4 of negative lens, negative lens, positive lens, plastic aspherical element lens successively from the thing side.
In addition, in zoom lens of the present invention, the 1st lens combination can be made of 1 negative lens, positive lens below 3.At this moment, with constitute the 1st lens combination positive lens Abbe number on average be made as ν 1p, when the Abbe number that constitutes the negative lens of the 1st lens combination is made as ν 1n, preferably satisfy following conditional (7).
33＜ν1p-ν1n＜50…(7)
And, in zoom lens of the present invention, the 2nd lens combination by in the picture plastic aspherical element lens of side, the effective diameter end of the face of thing side and the thing side summit on the optical axis at the interval of optical axis direction, and be made as dZ as the big side on effective diameter end in the side and the optical axis as among the interval of side summit at optical axis direction, to from the above-mentioned effective diameter end the face of the side of giving this dZ when the length of the vertical line of optical axis is made as dY, preferably satisfy following conditional (8).
0.01＜dZ/dY＜0.20…(8)
In addition, the value of each conditional is the value in the reference wavelength of zoom lens, for example, when the reference wavelength of zoom lens is d line (wavelength 587.6nm), becomes value on the d line at refractive index that above-mentioned conditional is put down in writing or Abbe number.
Camera head of the present invention is characterised in that to possess the zoom lens of the present invention of above-mentioned record.
According to the present invention, the 1st lens combination and the 3rd lens combination are being made as fixing group, become doubly by move the 2nd lens combination along optical axis, in the correction and the zoom lens that move the mode of carrying out of focusing of image planes position with this by the 4th lens combination, suitably set the structure of the 2nd lens combination, and the formula that satisfies condition (1), thus, can provide to constitute small-sizedly and keep high optical property, and seek the zoom lens of cost degradation and possess the camera head of these zoom lens.
Description of drawings
Fig. 1 is the sectional view of the lens arrangement of the related zoom lens of expression embodiments of the invention 1.
Fig. 2 is the sectional view of the lens arrangement of the related zoom lens of expression embodiments of the invention 2.
Fig. 3 is the sectional view of the lens arrangement of the related zoom lens of expression embodiments of the invention 3.
Fig. 4 is the sectional view of the lens arrangement of the related zoom lens of expression embodiments of the invention 4.
Fig. 5 is the sectional view of the lens arrangement of the related zoom lens of expression embodiments of the invention 5.
Fig. 6 is the sectional view of the lens arrangement of the related zoom lens of expression embodiments of the invention 6.
Fig. 7 is the sectional view of the lens arrangement of the related zoom lens of expression embodiments of the invention 7.
Fig. 8 is the sectional view of the lens arrangement of the related zoom lens of expression embodiments of the invention 8.
Fig. 9 is the sectional view of the lens arrangement of the related zoom lens of expression embodiments of the invention 9.
Figure 10 is the figure of the sectional view of expression plastic aspherical element lens and the light by the effective diameter end.
Figure 11 is each aberration diagram of the related zoom lens of embodiments of the invention 1.
Figure 12 is each aberration diagram of the related zoom lens of embodiments of the invention 2.
Figure 13 is each aberration diagram of the related zoom lens of embodiments of the invention 3.
Figure 14 is each aberration diagram of the related zoom lens of embodiments of the invention 4.
Figure 15 is each aberration diagram of the related zoom lens of embodiments of the invention 5.
Figure 16 is each aberration diagram of the related zoom lens of embodiments of the invention 6.
Figure 17 is each aberration diagram of the related zoom lens of embodiments of the invention 7.
Figure 18 is each aberration diagram of the related zoom lens of embodiments of the invention 8.
Figure 19 is each aberration diagram of the related zoom lens of embodiments of the invention 9.
Figure 20 is the brief configuration figure of the related camera head of embodiments of the present invention.
Among the figure: 1-zoom lens, 2-optical filter, 4-imaging apparatus, 5-signal processing circuit, 6-display device, 10-video camera, G1-the 1st lens combination, G2-the 2nd lens combination, G3-the 3rd lens combination, G4-the 4th lens combination, G5-the 5th lens combination, PP-optics, St-aperture diaphragm, Z-optical axis.
Embodiment
Below, with reference to accompanying drawing embodiments of the present invention are at length described.
Fig. 1 is the sectional view of the structure of the related zoom lens of expression one embodiment of the present invention, corresponding to the zoom lens of aftermentioned embodiment 1.
The related zoom lens of embodiments of the present invention possess from the thing side successively along optical axis Z: have positive refracting power and fixing the 1st lens combination G1 when becoming times; Has negative refracting power and by move the 2nd lens combination G2 that becomes doubly along optical axis Z; Aperture diaphragm St; Has positive refracting power and fixing the 3rd lens combination G3 when becoming times; Have positive refracting power and follow the correction of change image planes position doubly and the 4th lens combination G4 of focusing.
In addition, aperture diaphragm St shown in Figure 1 may not represent its size or shape, and represents its position on optical axis Z.And the left side is the thing side in Fig. 1, and the right side is the picture side.In Fig. 1, represent the lens configuration in infinity when focusing of wide-angle side at epimere, the lens configuration when hypomere is represented the infinity focusing of telescope end is represented from the concise and to the point motion track of each lens combination of wide-angle side when telescope end becomes times with arrow.
And, in Fig. 1, image planes are illustrated as Sim.For example, when these zoom lens were applicable to camera head, the shooting face that is configured to imaging apparatus was positioned at image planes Sim.
When zoom lens are applicable to camera head, preferably according to the structure of the camera side of loading lens, various optical filters such as configuration cover glass or prism, infrared intercepting filter, low pass filter etc. between by the lens of picture side and shooting face, in the example shown in Fig. 1, the parallel flat shape optics PP that imagines these is configured in by between the picture lens combination and image planes Sim of side.
These zoom lens constitute from wide-angle side when telescope end becomes times, the 1st lens combination G1 and the 3rd lens combination G3 are fixing on optical axis, by the 2nd lens combination G2 is become doubly as side shifting along optical axis direction, and follow the correction and the focusing of this change image planes position doubly by move the 4th lens combination G4 along optical axis.That is, the 2nd lens combination G2 possesses the function as variable focus lens package, and the 4th lens combination G4 possesses the function of lens combination by way of compensation and focus lens group.
The zoom lens of present embodiment have distinctive structure at the 2nd lens combination G2.The 2nd lens combination G2 comprises 2 negative lenses at least, the 2nd lens combination G2 by constituting by plastic material as the side configuration and having aspheric plastic aspherical element lens of at least 1.
For example, these 4 of the cemented lens that constitutes by the negative lens L21 of meniscus shape, by the applying of the positive lens L23 of the negative lens L22 of concave-concave shape and biconvex shape successively from the thing side of the 2nd lens combination G2 of example shown in Figure 1, lens L24 constitute.The negative lens L21 of example shown in Figure 1 and negative lens L22 are the glass spherical lenses.The two sides of lens L24 is the plastic aspherical element lens of aspheric surface.
The 2nd lens combination G2 by non-spherical lens being set as side, thereby aberration change can suppress to become times time the or image planes change, distortion.And, by constitute these lens L24 by plastics, can seek cost degradation and lightweight.Because plastic lens is compared with glass lens, the degree of freedom height of shape, thus the position or the focal power of configuration are set well, thus very useful lens become.
But, described in a project of problem, when using plastic lens, must be noted that by temperature variation and bring the big aspect of characteristic variations.At this, constitute in the present embodiment and satisfy following conditional (1), the focal power that is set at lens L24 is little.
2.4＜|f2a/f2|＜10.0…(1)
Herein, f2a be the 2nd lens combination G2 by the focal length of the plastic aspherical element lens of picture side, f2 is the focal length of the 2nd lens combination G2.
Conditional (1) regulation the 2nd lens combination G2 by the ratio of the focal length of the focal length of the plastic aspherical element lens that look like side and the 2nd lens combination G2, promptly stipulate the ratio of these plastic aspherical element lens to the focal power of the 2nd lens combination G2.Conditional (1) can be described as be used for by plastics constitute the 2nd lens combination G2 by the condition of the non-spherical lens of picture side.If be lower than the lower limit of conditional (1) more, the 2nd lens combination G2's is the biggest more by the plastic aspherical element power of lens of picture side, then follows the variation of the characteristic of temperature variation just to become big.And, general because the refractive index of plastics is low, therefore, if be lower than conditional (1) lower limit more, the 2nd lens combination G2's is the biggest more by the plastic aspherical element power of lens of picture side, and then the curvature of lens just becomes big, follows the foozle of lens or the performance degradation of assembly error also to become very big.If surpass more the upper limit of conditional (1), the 2nd lens combination G2's is more the littlest by the plastic aspherical element power of lens that looks like side, and then the curvature of these lens diminishes, just aberration correction fully.
For example, lens L24 distributes focal power hardly to be influenced, and performance is as being used for the effect of " the aberration correction lens " of aberration correction well.By lens L24 is made as this lens, when constituting lens L24, reduce influence of temperature variation by plastics, can keep the good optical performance.
As another above-mentioned lime light, because plastics are low-index materials, exist the focal power that is had to become big more, the curvature of lens is just big more, and the performance degradation of following foozle or assembly error is with regard to the very large problem that becomes.In the present embodiment, as " aberration correction lens ", set this focal power little lens L24, thereby needn't increase curvature, also just can address this problem.
And the necessary negative focal power of the 2nd lens combination G2 can constitute by the 2nd lens combination G2 and comprise that at least 2 negative lenses obtain.In example shown in Figure 1, possess 2 negative lens L21, L22, wherein negative lens L22 is made as the concave-concave shape.By this structure, can guarantee the necessary big negative focal power of the 2nd lens combination G2, thereby and make the amount of movement when becoming times reduce to seek miniaturization.
Especially, example as shown in Figure 1, when 2 negative lenses of the thing side of the 2nd lens combination G2 configuration, by distributing negative focal power morely in the thing side, the thing side can be approached in the position of the thing side principal point of the 2nd lens combination and shorten the 1st lens combination G1 and the principal point of the 2nd lens combination G2 at interval.Thus, the height that passes through the 1st lens combination G1 of an outer light beam can be reduced, and the miniaturization of the diameter of front lens can be sought.
The 2nd lens combination G2 of present embodiment is made comparisons with lens combination in the past and inquire into.The 2nd lens combination that patent documentation 1,2 is put down in writing be bear, negative, positive 3 chip architectures, be the plastic aspherical element lens from the 2nd negative lens of thing side.These plastic aspherical element lens are concave-concave shapes, can think that not only undertaking aberration correction also undertakes the great function that focal power is distributed.In as patent documentation 1,2 structures of being put down in writing, in order to reduce influence of temperature variation or in order to reduce the curvature of lens, and hypothesis reduces under the situation of focal power of this negative lens, and the focal power of the 2nd lens combination diminishes, mobile quantitative change when becoming times is big, and system is maximized.
This is adopted in the 2nd lens combination of present embodiment shown in Figure 1 more dispose 1 plastic aspherical element lens that focal power is little by the picture side in 3 negative, negative, positive chip architectures, therefore, influence of temperature variation is little, needn't increase the curvature of plastic aspherical element lens, also can guarantee the negative focal power of the 2nd lens combination G2 and also can carry out the miniaturization of system.
And, different with patent documentation 1,2 in the present embodiment, can will be made as the glass spherical lens from the 2nd negative lens of thing side.By this negative lens is made as glass lens, thereby make it be easy to hold big focal power, the amount of movement in the time of can reducing to become times and carry out miniaturization.In addition, because with respect to the low and selectivity height of glass lens material of plastic lens material selectivity, so, by being made as glass lens, help the correction of chromatic aberation.Especially, when the positive lens from the 2nd negative lens of thing side and adjacency of the 2nd lens combination constituted cemented lens, the selection that is used for the material of chromatic aberation correction became important.And, the making of relevant cemented lens, glass lens is more favourable than plastic lens.
The 2nd lens combination that patent documentation 3 is put down in writing be bear, negative, positive, negative 4 chip architectures, identical with the lens number of present embodiment.But in patent documentation 3, the lens of thing side that lean on most that will have big focal power are made as non-spherical lens, therefore, are difficult to constitute this lens by plastics.To this, in the present embodiment, in the included lens of the 2nd lens combination G2, be made as plastic lens by applying aspheric surface at the smaller lens that lean on the image planes side most of focal power, can reduce the influence that brings by temperature variation, and, can seek cost degradation, lightweight.
Promptly, by and lens L24 that have good aberration correcting capability little by the influence that plastics constitute, temperature variation is brought of cheapness and light weight as the side configuration leaning on most of the 2nd lens combination G2, thereby can reduce the glass aspheric lenses of using in the past, seek cost degradation, and constitute small-sizedly, can obtain the zoom lens of aberration correction well.
In addition, the structure of the 2nd lens combination G2 is not limited to example shown in Figure 1.For example, the 2nd lens combination G2 can have negative focal power by the plastic aspherical element lens as side near optical axis, also can have positive focal power.And, as described later shown in the embodiment, the 2nd lens combination G2 also can be made as negative lens, negative lens, negative lens, positive lens successively from the thing side, have at least 1 aspheric surface and 5 chip architectures of the plastic aspherical element lens that are made of plastic material, can further disperse the necessary negative focal power of the 2nd lens combination G2 this moment, so can suppress the focal power of each negative lens or make the 2nd lens combination G2 have bigger negative focal power.And the 2nd lens combination G2 also can constitute has the cemented lens that the applying by negative lens and positive lens forms, and helps the correction of chromatic aberation this moment.
Structure as the 1st lens combination G1, can constitute by 1 negative lens and the positive lens below 3, for example, example as shown in Figure 1 also can be that the cemented lens that is formed by the applying of the positive lens L12 of negative lens L11 by meniscus shape and meniscus shape successively from the thing side, the positive lens L13 of meniscus shape, 4 chip architectures that the positive lens L14 of meniscus shape constitutes constitute.
Structure as the 3rd lens combination G3, for example, example as shown in Figure 1 also can be made as 3 chip architectures that the cemented lens that formed by the applying of the negative lens L33 of the positive lens L31 of meniscus shape, positive lens L32 by meniscus shape and meniscus shape near axis area constitutes.
As the structure of the 4th lens combination G4, example as shown in Figure 1 for example also can be made as by the positive lens L41 of biconvex shape and the negative lens L42 of meniscus shape constitutes near axis area 2 chip architectures.
And, as shown in the embodiment described later, also can be the 4th lens combination G4 more by have the structure of lens combination as side.
The related zoom lens of embodiments of the present invention preferably constitute the formula that further meets the following conditions except said structure, thus, can obtain better characteristic.In addition,, can satisfy any conditional in following conditional, perhaps also can satisfy combination arbitrarily as preferred mode.
With the 2nd lens combination G2 be made as f2a by focal length as the plastic aspherical element lens of side, when the focal length of the 2nd lens combination G2 is made as f2, the formula that preferably meets the following conditions (1-1).
2.4＜f2a/f2＜10.0…(1-1)
Conditional (1-1) satisfies above-mentioned conditional (1), and what represent the 2nd lens combination G2 is negative lens near axis area by the plastic aspherical element lens as side.During the formula that satisfies condition (1-1), except the effect that obtains by the formula of satisfying condition (1), can disperse the negative focal power of the 2nd lens combination G2, so can suppress the phenomenon that the focal power of each negative lens of the 2nd lens combination G2 becomes excessive.Thus, seek the miniaturization of lens combination length overall easily, and aberration change or image planes change when suppress becoming times.
To be made as M2 from the amount of movement of the 2nd lens combination G2 of from wide-angle side to the change of telescope end times, when the focal length of the 2nd lens combination G2 is made as f2, preferably satisfy following conditional (2).
2.5＜|M2/f2|＜3.8…(2)
The ratio of the amount of movement of conditional (2) regulation the 2nd lens combination G2 and the focal length of the 2nd lens combination G2.If be lower than the lower limit of conditional (2), then be difficult to seek high magnificationization.If surpass the upper limit of conditional (2), then the mobile quantitative change of the 2nd lens combination G2 is big, and it is big that the lens length overall becomes.Perhaps Petzval and increase in negative direction, it is big that curvature of the image becomes, so not preferred.
In addition, more preferably satisfy following conditional (2-1).By the formula of satisfying condition (2-1), can further improve the effect that obtains by the formula of satisfying condition (2).
2.6＜|M2/f2|＜3.7…(2-1)
To be made as fw at the focal length of the total system of wide-angle side, when maximum image height is made as IH, preferably satisfy following conditional (3).
1.4＜fw/IH＜2.1…(3)
The focal length of the total system of conditional (3) regulation wide-angle side and the ratio of maximum image height.In zoom lens as the structure of present embodiment, want to seek wide-angleization if be lower than the lower limit of conditional (3), then by middle the zoom position of wide-angle side, big to the light hypermutation of an outer light beam of the 1st lens combination G1 incident, keep away the ever-larger diameters of unavoidable the 1st lens combination G1.And the focal power that the 2nd lens combination G2 is born becomes too big, and each power of lens that is included in the 2nd lens combination G2 becomes big, and aberration change or image planes change when becoming times become big.If surpass the upper limit of conditional (3), then as video camera or monitor that the field angle with video camera becomes insufficient.
In addition, more preferably satisfy following conditional (3-1).By the formula of satisfying condition (3-1), can further improve the effect that obtains by the formula of satisfying condition (3).
1.5＜fw/IH＜2.0…(3-1)
The focal length of the 1st lens combination G1 is made as f1, when the focal length of the 2nd lens combination G2 is made as f2, preferably satisfies following conditional (4).
4.3＜|f1/f2|＜5.5…(4)
The ratio of the focal length of conditional (4) regulation the 1st lens combination G1 and the 2nd lens combination G2, be used for hypermutation doubly and compact structure keep the condition of good optical performance.If be lower than the lower limit of conditional (4) more, it is big that the focal length of the 2nd lens combination G2 becomes, and the focal length of the 1st lens combination G1 diminishes, and then follows the mobile quantitative change that becomes the 2nd lens combination G2 doubly big, makes the diameter of lens length overall or front lens be difficult to miniaturization.And the mobile quantitative change of the 4th lens combination G4 in the distally that is visible is big, and the aberration change when becoming times becomes big.On the contrary, if surpass the upper limit of conditional (4), then be difficult to various aberrations such as correcting distorted well.
In addition, more preferably satisfy following conditional (4-1).By the formula of satisfying condition (4-1), can further improve the effect that obtains by the formula of satisfying condition (4).
4.4＜|f1/f2|＜5.4…(4-1)
When the 2nd lens combination G2 comprises 1 positive lens, when the Abbe number of this positive lens is made as ν 2p, preferably satisfy following conditional (5).
ν2p＜25…(5)
Conditional (5) regulation is included in the Abbe number of the positive lens of the 2nd lens combination G2, by satisfying these, only is 1 also correcting colour aberration well even be included in the positive lens of the 2nd lens combination G2.If surpass the upper limit of conditional (5), it is big that Abbe number becomes, and the effect step-down proofreaied and correct of the chromatic aberation among the 2nd lens combination G2 then is difficult to realize that hypermutation doubly changes and high performance.
In addition, more preferably satisfy following conditional (5-1).By the formula of satisfying condition (5-1), can further improve the effect that obtains by the formula of satisfying condition (5).
ν2p＜21…(5-1)
When the 2nd lens combination G2 comprises 1 positive lens, when the refractive index of this positive lens is made as N2p, preferably satisfy following conditional (6).
N2p＞1.83…(6)
Conditional (6) regulation is included in the refractive index of the positive lens of the 2nd lens combination G2.If be lower than the lower limit of conditional (6), the change of the coma aberration when then being difficult to suppress to become times.
In addition, more preferably satisfy following conditional (6-1).By the formula of satisfying condition (6-1), can further improve the effect that obtains by the formula of satisfying condition (6).
N2p＞1.90…(6-1)
When the 1st lens combination G1 is made of 1 negative lens and the positive lens below 3, with constitute the 1st lens combination G1 positive lens Abbe number on average be made as ν 1p, when the Abbe number that constitutes the negative lens of the 1st lens combination G1 is made as ν 1n, preferably satisfy following conditional (7).
33＜ν1p-ν1n＜50…(7)
The relation of the Abbe number of the average and negative lens that constitutes the 1st lens combination G1 of the Abbe number of the positive lens of conditional (7) regulation formation the 1st lens combination G1.If be lower than the lower limit of conditional (7), then the refractive index of positive lens uprises, and helps the miniaturization of the 1st lens combination, but is difficult to the correcting colour aberration, the chromatic aberation in the distally that especially is visible.If the mode by the upper limit that surpasses conditional (7) is used the little material of chromatic dispersion at positive lens, then help the correction of chromatic aberation, but the curvature of the refractive index step-down of positive lens and positive lens becomes big, therefore, in order to ensure the edge thickness of these lens, the 1st lens combination G1 becomes maximization.
In addition, more preferably satisfy following conditional (7-1).By the formula of satisfying condition (7-1), can further improve the effect that obtains by the formula of satisfying condition (7).
35＜ν1p-ν1n＜48…(7-1)
And, the 2nd lens combination G2 by the picture plastic aspherical element lens of side in, effective diameter end in the face of thing side and the thing side summit on the optical axis at the interval of optical axis direction, and be made as dZ as the big side on effective diameter end in the side and the optical axis as among the interval of side summit at optical axis direction, to from the above-mentioned effective diameter end of the face of the side of giving this dZ when the length of the vertical line of optical axis is made as dY, preferably satisfy following conditional (8).
0.01＜dZ/dY＜0.20…(8)
An example of representing above-mentioned dZ and dY at Figure 10.Figure 10 illustrate the 2nd lens combination G2 by the plastic aspherical element lens as side be lens L24 sectional view and by than the optical axis Z of these lens L24 more by the example of the light Mg of the effective diameter end of downside.Light Mg is the light of decision effective diameter end.In Figure 10, the left side of figure is the thing side, and the right side of figure is the picture side, and complicated for fear of figure omits the part of light Mg and the diagram of other lens.
In example shown in Figure 10, the face of thing side becomes the face of giving the dZ side, effective diameter end Ped in the face of thing side and the thing side summit P on the optical axis
0Become dZ at the interval of optical axis direction, become dY to the length of the sagging vertical line of optical axis Z from effective diameter end Ped.
Conditional (8) regulation the 2nd lens combination G2 by the amount of sag (サ グ amount) in the effective diameter end of the plastic aspherical element lens that look like side and the ratio of distance from the effective diameter end to optical axis.If be lower than the lower limit of conditional (8), then this lens curvature diminishes, fully aberration correction.If surpass the upper limit of conditional (8), then the length overall of the 2nd lens combination G2 is elongated.And, the time constitute the axle offset of lens of the 2nd lens combination G2 or the tolerance of the error of collapsing etc. diminishes in assembling.
In addition, more preferably satisfy following conditional (8-1).By the formula of satisfying condition (8-1), can further improve the effect that obtains by the formula of satisfying condition (8).
0.02＜dZ/dY＜0.18…(8-1)
And, these zoom lens for example wait when using in the severe environment without, be configured in the temperature variation that lens by the thing side preferably use the anti-anti-surface deterioration that is caused by wind and rain, caused by direct sunlight, and then preferably use chemicalss such as anti-anti-grease/washing agent material, be water tolerance, against weather, acid resistance, the contour material of resistance to chemical reagents, and, preferably use material hard and that be difficult to fragmentation.According to above situation, lean on the material of thing side preferably to use glass particularly most as being configured in, perhaps also can use transparent pottery.
When in the environment of sternness, using these zoom lens, preferably apply the multilayer film coating of protection usefulness.In addition, protection with coating beyond, also can apply the anti-reflection coating film of the ghost image light that is used to reduce when using etc.
In example shown in Figure 1, show the example of configuration optics PP between lens combination and imaging surface Sim, but also can replace disposing low pass filter or by the various optical filters in certain wavelengths zone etc., these various optical filters of configuration between each lens perhaps also can apply the coating with effect identical with various optical filters at the lens face of any lens.
As above explanation, according to the zoom lens of present embodiment, by suitably adopting above-mentioned preferred construction according to desired specification etc., little amplitude increases the lens number, and can constitute small-sizedly, and can take into account good aberration correction and cost degradation.
[embodiment]
Then, the numerical value embodiment to zoom lens of the present invention describes.The lens profile of the zoom lens of embodiment 1 is illustrated in Fig. 1.Each lens profile figure of the zoom lens of embodiment 2～9 is shown in Fig. 2～Fig. 9 respectively.The graphic technique of Fig. 2～Fig. 9 is identical with Fig. 1.
The basic lens data of the zoom lens that embodiment 1 is related is shown in table 1, and the data of relevant zoom (becoming doubly) are shown in table 2, and aspherical surface data is shown in table 3.Similarly, data, the aspherical surface data of the master data of the zoom lens that embodiment 2～9 is related, relevant zoom are shown in table 4～table 27.Following, the meaning about the mark in the table is taken as example with embodiment 1 and is described, but also basic identical to embodiment 2～9.
In the basic lens data of table 1, Si represent with by the face of the textural element of thing side be the 1st and along with towards the i that increases successively as side (i=1,2,3 ...) the face number, Ri represents the radius-of-curvature of i face, Di represent on the optical axis Z of i face and i+1 face face at interval.In addition, face at interval descend most the hurdle in representing final face and the face of image planes Sim at interval.And, in basic lens data, Ndj represent with by the lens of thing side be the 1st and along with towards the j that increases successively as side (j=1,2,3 ...) optical parameter to the refractive index of d line (wavelength 587.6nm), ν dj represents the Abbe number of j optical parameter to the d line.In addition, in basic lens data, also comprise expression aperture diaphragm St and optics PP.Hurdle in the radius-of-curvature of the face that is equivalent to aperture diaphragm St records (aperture diaphragm).The symbol of the radius-of-curvature of basic lens data will be that protruding situation just is made as in the thing side, will be in that as side to be that protruding situation is made as negative.
In the basic lens data of table 1, record D7 (variable), D14 (variable), D20 (variable), D24 (variable) respectively on the hurdle that is equivalent to the face at the interval of interval, the 4th lens combination G4 and the optics PP of interval, the 3rd lens combination G3 and the 4th lens combination G4 of interval, the 2nd lens combination G2 and the aperture diaphragm St of the 1st lens combination G1 of interval variation and the 2nd lens combination G2 interval in order to become doubly.
In addition, the face of interval variation symbol at interval is as above-mentioned for embodiment 1 in order to become doubly, but takes the symbol according to each structure in embodiment described later.
The value of the focal distance f of the total system in the data of the relevant zoom of table 2 in the expression wide-angle side telescope end, F number Fno., full field angle 2 ω, each face interval D 7 of following change times variation, D14, D20, D24.The unit degree of being of full field angle 2 ω.
Unit as f, the D7 of the unit of the Ri of table 1 and Di, table 2, D14, D20, D24 can use " mm ", even but optical system is amplified in proportion or scaledly also can be obtained equal optical property, so unit is not limited to " mm ", also can use other suitable unit.
In the basic lens data of table 1, enclose * number at aspheric number, represent the numerical value of paraxial radius-of-curvature as aspheric radius-of-curvature.The lens symbol of expression non-spherical lens, aspheric number, such relevant these aspheric asphericity coefficients in the aspherical surface data of table 3.Asphericity coefficient is by each COEFFICIENT K A, RA in the aspheric surface formula of representing with following formula (A)
m(m=3,4,5 ... 10) value.
Zd＝C·h
2/{1+(1-KA·C
2·h
2)
1/2}+∑RA
m·h
m…(A)
Wherein,
Zd: the aspheric surface degree of depth (point on the aspheric surface of height h hang down into the aspheric surface summit tangent and perpendicular to the length of perpendicular on the plane of optical axis)
H: highly (distance from the optical axis to the lens face)
C: the inverse of paraxial radius-of-curvature
KA, RA
m: asphericity coefficient (m=3,4,5 ... 10)
In addition, when using mm in the unit of the Ri of table 1 and Di, the unit of above-mentioned Zd, h also becomes mm.
[table 1]
(*: aspheric surface)
[table 2]
[table 3]
The 2nd lens combination G2 by the focal power in the near axis area of the plastic aspherical element lens of picture side, the focal power of executing example 1,9 really just is, the focal power of embodiment 2～8 is negative.
[table 4]
(*: aspheric surface)
[table 5]
[table 6]
[table 7]
(*: aspheric surface)
[table 8]
[table 9]
Zoom lens a great difference point of the zoom lens of embodiment 3 and embodiment 1 is that the 1st lens combination G1 is made of 3 chip architectures of negative lens L11, positive lens L12, positive lens L13.
[table 10]
(*: aspheric surface)
[table 11]
[table 12]
[table 13]
(*: aspheric surface)
[table 14]
[table 15]
Zoom lens a great difference point of the zoom lens of embodiment 5 and embodiment 1 is that the 1st lens combination G1 is made of 3 chip architectures of negative lens L11, positive lens L12, positive lens L13.
[table 16]
(*: aspheric surface)
[table 17]
[table 18]
Zoom lens a great difference point of the zoom lens of embodiment 6 and embodiment 1 is, the 1st lens combination G1 is made of 3 chip architectures of negative lens L11, positive lens L12, positive lens L13, the 3rd lens combination G3 all is made of simple lens, and the 4th lens combination G4 is 1 chip architecture of positive lens L41.
[table 19]
(*: aspheric surface)
[table 20]
[table 21]
[table 22]
(*: aspheric surface)
Zoom lens a great difference point of the zoom lens of embodiment 8 and embodiment 1 is, the 2nd lens combination G2 is the positive lens L24 of negative lens L23, the biconvex shape of negative lens L22, the concave-concave shape of negative lens L21, the concave-concave shape of meniscus shape, near axis area whole 5 chip architectures that constitute by simple lens of the lens L25 of the plastic aspherical element lens of concave-concave shape, also possess the 5th lens combination G5 that constitutes by 1 negative lens L51.The 5th lens combination G5 among the embodiment 8 fixes when becoming times, follows correction and the focusing that becomes image planes position doubly by the 4th lens combination G4.
[table 25]
| *25 | -1.9935 | D25 (variable) | ||
| 26 | 3.1764 | 0.29 | 1.48749 | 70.4 |
| 27 | 4.3981 | 0.24 |
| 28 | ∞ | 0.37 | 1.51680 | 64.2 |
| 29 | ∞ | 0.61 |
(*: aspheric surface)
[table 26]
[table 27]
Zoom lens a great difference point of the zoom lens of embodiment 9 and embodiment 1 is that the 2nd lens combination G2 all is made of simple lens, also has the 5th lens combination G5 that is made of 1 positive lens L51.The 5th lens combination G5 among the embodiment 9 fixes when becoming times, follows correction and the focusing that becomes image planes position doubly by the 4th lens combination G4.
In the value of table 28 expression corresponding to the conditional among the embodiment 1～9 (1)～(8).As shown in Table 28, formula (1)～(8) that all satisfy condition of any among the embodiment 1～9.
[table 28]
Each aberration diagram in the wide-angle side of the zoom lens of Figure 11 (A)～Figure 11 (H) expression embodiment 1 and the spherical aberration in the telescope end (also claiming spherical aberration), astigmatism (also claiming astigmatism), distortion (distortion aberration), multiplying power chromatic aberation (also claiming ratio chromatism).Represent that at each aberration diagram with d line (wavelength 587.6nm) be the aberration of reference wavelength, but also represent aberration wavelength 460.0nm, wavelength 615.0nm at spherical aberration diagram and multiplying power chromatic aberation figure.The Fno. of spherical aberration diagram is meant the F number, and the ω of other aberration diagram is meant angle of half field-of view.
Similarly, at each aberration diagram of the wide-angle side of the zoom lens of Figure 12 (A)～Figure 12 (H), Figure 13 (A)～Figure 13 (H), Figure 14 (A)～Figure 14 (H), Figure 15 (A)～Figure 15 (H), Figure 16 (A)～Figure 16 (H), Figure 17 (A)～Figure 17 (H), Figure 18 (A)～Figure 18 (H), Figure 19 (A)～Figure 19 (H) expression embodiment 2～9 and the spherical aberration in the telescope end, astigmatism, distortion (distortion aberration), multiplying power chromatic aberation.
By above data as can be known, the zoom lens of embodiment 1～9 have about 10～20 times multiplying power, seek miniaturization.And the F of wide-angle side number (also claiming the F number) little to 1.9 about, can proofread and correct each aberration well, wide-angle side and telescope end all have high optical property in visibility region.These zoom lens can suitably use at camera heads such as surveillance camera, video camera, electronic still video cameras.
Represent a example at Figure 20, use the related zoom lens 1 of embodiments of the present invention and the structural drawing of the video camera 10 that constitutes as the camera head of embodiments of the present invention.In addition, in Figure 20, represent the 1st positive lens combination G1, negative the 2nd lens combination G2, aperture diaphragm St, the 3rd positive lens combination G3, the 4th positive lens combination G4 that zoom lens 1 possess briefly.
Picture by zoom lens 1 shooting is imaged on the shooting face of imaging apparatus 4, relevant this picture from the output signal of imaging apparatus 4 in signal processing circuit 5 by calculation process, be shown in display device 6.
In addition, be shown with the camera head of the so-called veneer mode of using 1 imaging apparatus 4 at Figure 20 figure, but as camera head of the present invention, insertion is divided into R (redness), G (green), B colour splitting prisms of all kinds such as (bluenesss) between zoom lens 1 and imaging apparatus 4, and use also can corresponding to the camera head of the what is called 3 plate modes of 3 imaging apparatuss of all kinds.
The related zoom lens of embodiments of the present invention have above-mentioned advantage, and therefore, the camera head of present embodiment can be small-sized and be constituted, and can obtain the image of high image quality at low cost.
More than, exemplify embodiment and embodiment and the present invention has been described, but the invention is not restricted to above-mentioned embodiment and embodiment, can carry out various distortion.For example, the value of the radius-of-curvature of each lens composition, face interval, refractive index, Abbe number etc. is not limited to the value represented at above-mentioned each numerical value embodiment, the value that can get other.
Claims (11)
1. zoom lens is characterized in that, possess successively from the thing side:
The 1st lens combination has positive refracting power and fixes when becoming times;
The 2nd lens combination has negative refracting power and becomes doubly by moving along optical axis;
Diaphragm;
The 3rd lens combination has positive refracting power and fixes when becoming times;
The 4th lens combination has positive refracting power and follows correction and the focusing that becomes image planes position doubly;
Above-mentioned the 2nd lens combination comprises 2 negative lenses at least, above-mentioned the 2nd lens combination by being aspheric surface and the plastic aspherical element lens that constitute by plastic material as at least 1 of side configuration,
The focal length of these plastic aspherical element lens is made as f2a, when the focal length of above-mentioned the 2nd lens combination is made as f2, satisfies following conditional (1):
2.4＜|f2a/f2|＜10.0 …(1)。
2. zoom lens as claimed in claim 1 is characterized in that,
In the time of will being made as M2 from the amount of movement of above-mentioned 2nd lens combination of wide-angle side to telescope end becomes doubly, satisfy following conditional (2):
2.5＜|M2/f2|＜3.8 …(2)。
3. zoom lens as claimed in claim 1 or 2 is characterized in that,
The focal length of the total system of wide-angle side is made as fw, when the highest image height is made as IH, satisfies following conditional (3):
1.4＜fw/IH＜2.1 …(3)。
4. as each described zoom lens in the claim 1 to 3, it is characterized in that,
When the focal length of above-mentioned the 1st lens combination is made as f1, satisfy following conditional (4):
4.3＜|f1/f2|＜5.5 …(4)。
5. as each described zoom lens in the claim 1 to 4, it is characterized in that,
Above-mentioned the 2nd lens combination comprises 1 positive lens, when the Abbe number of this positive lens is made as ν 2p, satisfies following conditional (5):
ν2p＜25…(5)。
6. as each described zoom lens in the claim 1 to 5, it is characterized in that,
Above-mentioned the 2nd lens combination comprises 1 positive lens, when the refractive index of this positive lens is made as N2p, satisfies following conditional (6):
N2p＞1.83 …(6)。
7. as each described zoom lens in the claim 1 to 6, it is characterized in that,
Above-mentioned the 2nd lens combination constitutes by 4 of negative lens, negative lens, positive lens, above-mentioned plastic aspherical element lens successively from the thing side.
8. as each described zoom lens in the claim 1 to 7, it is characterized in that,
Above-mentioned the 1st lens combination is made of 1 negative lens, positive lens below 3.
9. zoom lens as claimed in claim 8 is characterized in that,
With constitute above-mentioned the 1st lens combination above-mentioned positive lens Abbe number on average be made as ν 1p, when the Abbe number that constitutes the above-mentioned negative lens of above-mentioned the 1st lens combination is made as ν 1n, satisfy following conditional (7):
33＜ν1p-ν1n＜50 …(7)。
10. as each described zoom lens in the claim 1 to 9, it is characterized in that,
In the above-mentioned plastic aspherical element lens of above-mentioned the 2nd lens combination, with the effective diameter end in the thing side and the thing side summit on the optical axis at the interval of optical axis direction, and be made as dZ as the big side on effective diameter end in the side and the optical axis as among the interval of side summit at optical axis direction, to from the above-mentioned effective diameter end the face of the side of giving this dZ when the length of the vertical line of optical axis is made as dY, satisfy following conditional (8):
0.01＜dZ/dY＜0.20 …(8)。
11. a camera head is characterized in that,
Possess each described zoom lens in the claim 1 to 10.
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| JP2008273137A JP2010102096A (en) | 2008-10-23 | 2008-10-23 | Zoom lens and image capturing apparatus |
| JP2008-273137 | 2008-10-23 |
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| CN101726841B true CN101726841B (en) | 2011-03-16 |
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| CN101943789B (en) * | 2009-07-09 | 2012-01-25 | 凤凰光学(广东)有限公司 | Large-aperture monitoring lens |
| JP5462081B2 (en) * | 2010-06-15 | 2014-04-02 | 富士フイルム株式会社 | Zoom lens and imaging device |
| JP5438620B2 (en) * | 2010-07-29 | 2014-03-12 | 富士フイルム株式会社 | Zoom lens and imaging device |
| WO2012120875A1 (en) | 2011-03-10 | 2012-09-13 | 富士フイルム株式会社 | Variable power optical system and image capture device |
| JP5932541B2 (en) * | 2011-09-30 | 2016-06-08 | オリンパス株式会社 | Zoom lens, imaging device using the same, video transmission device, and video transmission system |
| JP5866190B2 (en) * | 2011-12-05 | 2016-02-17 | ハンファテクウィン株式会社Ｈａｎｗｈａ Ｔｅｃｈｗｉｎ Ｃｏ．，Ｌｔｄ． | Zoom lens and imaging device |
| US9557541B2 (en) | 2011-12-05 | 2017-01-31 | Hanwha Techwin Co., Ltd. | Zoom lens system and photographing apparatus |
| KR101776705B1 (en) * | 2012-08-22 | 2017-09-08 | 한화테크윈 주식회사 | Zoom lens system and photographing apparatus with the same |
| JP6274749B2 (en) | 2013-05-14 | 2018-02-07 | キヤノン株式会社 | Zoom lens and imaging apparatus having the same |
| JP6415278B2 (en) * | 2014-11-28 | 2018-10-31 | キヤノン株式会社 | Zoom lens and imaging apparatus having the same |
| CN105785555B (en) * | 2016-03-28 | 2018-04-03 | 中山联合光电科技股份有限公司 | A kind of big image planes, high magnification, high-resolution optical system |
| TWI705266B (en) * | 2016-06-08 | 2020-09-21 | 揚明光學股份有限公司 | An optical system and an optical lens thereof |
| JP6786473B2 (en) * | 2017-12-27 | 2020-11-18 | 株式会社タムロン | Zoom lens |
| JP2021026110A (en) * | 2019-08-05 | 2021-02-22 | キヤノン株式会社 | Zoom lens and image capturing device having the same |
| CN116626870B (en) * | 2023-07-26 | 2023-09-26 | 成都优视光电技术有限公司 | Super-high definition close-up zoom lens |
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