CN101750722A - Zooming lens and camera device - Google Patents
Zooming lens and camera device Download PDFInfo
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- CN101750722A CN101750722A CN200910259044A CN200910259044A CN101750722A CN 101750722 A CN101750722 A CN 101750722A CN 200910259044 A CN200910259044 A CN 200910259044A CN 200910259044 A CN200910259044 A CN 200910259044A CN 101750722 A CN101750722 A CN 101750722A
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Abstract
The invention provides a zooming lens, which is small-sized and has good optical performance, and has little performance deterioration of the manufacture error or the assembly error even the focal power of a second lens group. The zooming lens, from the objective side, has, in order, a positive first lens group (G1), a negative second lens group (G2) moving to zoom, a diaphragm, a positive third lens group (G3), and a positive fourth lens group (G4) for performing the correction and focusing of the image position with the zooming. The second lens group (G2), from the objective side, has, in order, a first negative lens (L21), a curved moon-shaped lens (L22) with a convex surface toward the objective side, a second negative lens (L23), and a positive lens (L24). The focal length of the curved moon-shaped lens (L22) is f22, the focal length of the second lens (G2) is f2, thus the formula (1) is satisfied: the absolute value of f22/f2 is more than 5.0 (1).
Description
Technical field
The present invention relates to a kind of zoom lens and camera head, relate in more detail suitably to be used in video camera or the zoom lens of electronic still video camera, surveillance camera etc. and the camera head that possesses these zoom lens.
Background technology
In the past, as being used for civilian video camera or monitoring that the most motion of zoom lens with video camera etc. has 4 groups of formulas or 5 groups of formula zoom lens.For example, disclose the zoom lens of the F number of the change multiple proportions that has about 10 times and about 1.8 at patent documentation 1,2.In this type, no matter be one-board, 3 board-like, adopted jointly by 3 the 1st lens combination that constituted of negative lens, positive lens, positive lens and by the structure of 3 the 2nd lens combination that constituted of negative lens, negative lens, positive lens at most zoom lens.
Patent documentation 1: the open 2006-221208 communique of Jap.P.
Patent documentation 2: the open 2006-113257 communique of Jap.P.
Yet, as above-mentioned zoom lens in, follow the amount of movement that becomes the 2nd lens combination doubly and with the optical system miniaturization, the situation that the 2nd lens combination is given big negative focal power is more in order to reduce, so the focal power that each lens are born becomes big.At this moment, exist the performance degradation of following foozle or assembly error to become big problem easily.
Summary of the invention
The present invention is referred from above-mentioned situation and finishes, its purpose is, seek miniaturization and the 2nd lens combination when having big focal power even provide a kind of, also can will follow the performance degradation of foozle or assembly error to reduce, and keep the zoom lens of good high optical property and possess the camera head of these zoom lens.
Zoom lens of the present invention are characterised in that to 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 successively from the thing side: the 1st negative lens, with meniscus shaped lens, 2nd negative lens, the positive lens of convex surface towards the thing side, be made as f22 at focal length with meniscus shaped lens, when the focal length of the 2nd lens combination is made as f2, satisfy following conditional (1).
|f22/f2|＞5.0…(1)
At this, above-mentioned " with the meniscus shaped lens of convex surface towards the thing side " is meant near axis area the lens of convex surface towards the meniscus shape of thing side.And the f22 of conditional (1) is the focal length near axis area.
In addition, in the present invention, each " lens combination " is not only 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, the focal power of bearing according to the 1st negative lens and the 2nd negative lens of the 2nd lens combination does not increase and the 2nd lens combination has the mode of big focal power, has adopted the interval that enlarges the 1st negative lens and the 2nd negative lens, has also effectively utilized this interval to dispose the structure of meniscus shaped lens between 2 negative lenses.Can advantageously distort or the correction of astigmatism by this meniscus shaped lens.And in zoom lens of the present invention, by the formula of satisfying condition (1), as the conditional that the focal power of this meniscus shaped lens is reduced, the power configuration in the 2nd lens combination changes significantly, just can carry out good aberration correction.
In zoom lens of the present invention,, preferably satisfy following conditional (2), (3) with the Abbe number to the d line of the 2nd negative lens, when refractive index is made as v 23, N23 respectively.
v23＞58.0…(2)
N23＜1.55…(3)
And in zoom lens of the present invention, preferred meniscus shaped lens has 1 aspheric surface at least.
In addition, in zoom lens of the present invention, preferred meniscus shaped lens is made of plastic material.
And, in zoom lens of the present invention, when preferably the total system focal length of wide-angle side being made as fw, satisfy following conditional (4).
1.5＜|f2/fw|＜2.0…(4)
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 (5).
5.0＜|f1/f2|＜5.8…(5)
In addition, the short of special restriction of the value of each conditional is exactly the value at reference wavelength of zoom lens.
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, and become doubly by move the 2nd lens combination along optical axis, and follow by moving of the 4th lens combination in the zoom lens of mode of the correction that becomes image planes position doubly and focusing, owing to suitably set the structure of the 2nd lens combination, and be set as the formula of satisfying condition (1), therefore seeking miniaturization and the 2nd lens combination when having big focal power even can provide a kind of, also can will follow the performance degradation of foozle or assembly error to reduce, and keep the zoom lens of good optical performance 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 (A)～Fig. 7 (H) is each aberration diagram of the zoom lens of embodiments of the invention 1.
Fig. 8 (A)～Fig. 8 (H) is each aberration diagram of the zoom lens of embodiments of the invention 2.
Fig. 9 (A)～Fig. 9 (H) is each aberration diagram of the zoom lens of embodiments of the invention 3.
Figure 10 (A)～Figure 10 (H) is each aberration diagram of the zoom lens of embodiments of the invention 4.
Figure 11 (A)～Figure 11 (H) is each aberration diagram of the zoom lens of embodiments of the invention 5.
Figure 12 (A)～Figure 12 (H) is each aberration diagram of the zoom lens of embodiments of the invention 6.
Figure 13 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, the 10-video camera, G1-the 1st lens combination, G2-the 2nd lens combination, G3-the 3rd lens combination, G4-the 4th 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 example of the related zoom lens of expression embodiments of the present invention, and is corresponding with the zoom lens of embodiment 1 described later.And Fig. 2～Fig. 6 is the sectional view of another related structure example of expression embodiments of the present invention, and the zoom lens with embodiment 2～embodiment 6 described later are corresponding respectively.The basic structure of the example of Fig. 1～shown in Figure 6 is identical, and the graphic technique of each figure is also identical, therefore mainly comes the related zoom lens of embodiments of the present invention are described with reference to Fig. 1 at this.
The related zoom lens of embodiments of the present invention possess from the thing side successively along optical axis Z: the 1st lens combination G1 with positive refracting power; The 2nd lens combination G2 with negative refracting power; Diaphragm St; The 3rd lens combination G3 with positive refracting power; The 4th lens combination G4 with positive refracting power.
These zoom lens constitute: when the change of carrying out from the wide-angle side to the telescope end times, the 1st lens combination G1 and the 3rd lens combination G3 are fixing on optical axis Z, by make the 2nd lens combination G2 along optical axis Z to becoming doubly, and by the 4th lens combination G4 is moved correction and the focusing of following this change image planes position doubly along optical axis Z as side shifting.
The left side is the thing side in Fig. 1, and the right side is the picture side.Represent the lens configuration of wide-angle side at epimere, represent the lens configuration of telescope end, the schematic motion track of each lens combination when representing from the wide-angle side to the telescope end, to become times with arrow at hypomere.In addition, aperture diaphragm St shown in Figure 1 may not represent its size or shape, and the position on the expression optical axis Z.
And, in Fig. 1, image planes are illustrated as Sim.For example, with this zoom lens applications when being equipped with the camera head of imaging apparatus, the mode that is positioned at image planes Sim according to the shooting face of imaging apparatus disposes.
With zoom lens applications during in camera head, preferably according to the structure of the camera side of loading lens, the various optical filters of configuration cover glass or prism, infrared intercepting filter, low pass filter etc. etc. between by the lens of picture side and shooting face, in Fig. 1, expression has the optics PP of these parallel flat shapes of supposing to be configured in by the lens combination that looks like side and the example between the image planes Sim.
The zoom lens of present embodiment mainly have distinctive structure on the 2nd lens combination G2.Example as shown in Figure 1, the 2nd lens combination G2 constitute from the thing side comprise negative lens L21 successively, with meniscus shaped lens L22, negative lens L23, the positive lens L24 of convex surface towards the thing side.
In addition, meniscus shaped lens L22 so long as near axis area with the meniscus shape of convex surface towards the thing side, just can and have in the meniscus shaped lens of negative focal power any for the meniscus shaped lens that near axis area, has positive focal power.
For example, the 2nd lens combination G2 of the zoom lens of example shown in Figure 1 is aspheric surface by negative lens L21, the two sides of meniscus shape successively and is 3 group of 4 chip architecture that cemented lens constituted of the positive lens L24 of the negative lens L23 of the lens L22 of meniscus shape, concave-concave shape and meniscus shape near axis area from the thing side.
As described in of problem, in 4 groups zoom lens that have as present embodiment, generally with the optical system miniaturization, the situation that the 2nd lens combination is given big focal power is more in order to reduce the amount of movement of following change the 2nd lens combination doubly.But, if make the 2nd lens combination have big focal power and increase each power of lens of the 2nd lens combination, then the tolerance of foozle or assembly error diminishes easily, and becomes big easily with this performance degradation.
Thus, in these zoom lens, considered the configuration of 2 negative lens L21, L23 that the 2nd lens combination G2 has.Big more and its synthetic focal power in the airspace of 2 negative lens L21, L23 is just big more, so in order under the immovable state of the focal power of the 2nd lens combination the focal power of each negative lens of the 2nd lens combination to be reduced, can enlarge their airspace.
That is, in these zoom lens, adopt the structure at the interval that enlarges 2 negative lens L21, L23.Thus, can guarantee the big focal power that the 2nd lens combination is required, and the focal power that 2 negative lenses L21, L23 are born is reduced, increase the tolerance of foozle or assembly error, thereby can suppress to follow this performance degradation.
Except said structure, in these zoom lens in order effectively to utilize 2 spaces between negative lens L21, L23 also to adopt structure at the little meniscus shaped lens L22 of this spatial configuration focal power.By disposing the little meniscus shaped lens L22 of this focal power, the power configuration among the 2nd lens combination G2 need not change greatly, just can further advantageously distort or the correction of astigmatism (also claiming astigmatism).
For the focal power of meniscus shaped lens L22, satisfy following conditional (1) and stipulate by constituting these zoom lens.At this, f22 is the focal length of the meniscus shaped lens L22 of near axis area, and f2 is the focal length of the 2nd lens combination G2.
|f22/f2|＞5.0…(1)
Conditional (1) has been stipulated the relation of the focal length of meniscus shaped lens L22 and the 2nd lens combination G2, can be described as the focal power of the having stipulated meniscus shaped lens L22 formula to the ratio of the focal power of the 2nd lens combination G2.Meniscus shaped lens L22 is the situation of negative lens, if be lower than below the lower limit of conditional (1), then is difficult to correcting distorted equably or astigmatism.Meniscus shaped lens L22 is the situation of positive lens, if be lower than below the lower limit of conditional (1), then the focal power of the 2nd lens combination G2 is little, and the mobile quantitative change of the 2nd lens combination G2 when therefore becoming times is big, and lens combination will maximize.
Meniscus shaped lens L22 sets its focal power for and diminishes, so preferably constitute with plastic material.Plastic lens is subjected to following influence of temperature variation than glass lens is easy, but in the little situation of its focal power, follows influence of temperature variation to diminish.Can seek cost degradation and lightweight by constitute lens by plastic material, therefore become favourable.
And preferred meniscus shaped lens L22 has 1 aspheric surface at least.By aspheric surface being set, can suppress aberration change or distortion well at the 2nd lens combination G2.If aspheric surface is set at the big lens of focal power, then follow the performance degradation of foozle or assembly error to become big easily, so it is not preferred, if but the little meniscus shaped lens L22 of focal power, then follow the performance degradation of foozle or assembly error little, therefore preferably aspheric surface is set at meniscus shaped lens L22.And, be provided with aspheric lens from the aspect of cost or processability preferably by lens that plastic material constituted.
In addition, also preferably aspheric surface is set from the aspect that chromatic aberation is proofreaied and correct at meniscus shaped lens L22.In the 2nd lens combination G2, meniscus shaped lens L22 does not bring very big influence to chromatic aberation, and other the lens of the 2nd lens combination G2 bring very big influence to chromatic aberation.Suppose when other the lens of the 2nd lens combination G2 are provided with aspheric surface, preferably to be made as the aspherical plastic lens that constitutes by plastic material as above-mentioned, but lower with glassy phase than the selectivity of the material of plastics, therefore be difficult to carry out well the correction of chromatic aberation at this moment.To this, when meniscus shaped lens L22 was made as aspherical plastic lens, meniscus shaped lens L22 did not bring very big influence to chromatic aberation, therefore we can say and can not bring very big non-interests in the correction of chromatic aberation.
In addition, the structure of the 2nd lens combination G2 is not limited to example shown in Figure 1.Can consider that also the 2nd lens combination G2 is made of the lens more than 5, but when paying attention to miniaturization, 4 of constituting by above-mentioned negative lens L21, meniscus shaped lens L22, negative lens L23, positive lens L24 of preferred the 2nd lens combination G2 and constituting.
Structure as the 1st lens combination G1 of these zoom lens also can be made of 1 negative lens, 3 positive lenss.In the powerful zoom lens that have about 20 times, proofread and correct for the chromatic aberation of the side of looking in the distance well, preferably constitute the 1st lens combination G1 by 4 at least.
For example, the zoom lens of example shown in Figure 1 are 3 group of 4 chip architectures that is made of the positive lens L14 of the positive lens L13 of the cemented lens of the positive lens L12 of the negative lens L11 of meniscus shape and meniscus shape, meniscus shape, meniscus shape successively from the thing side.
Example as shown in Figure 1 for example, as the structure of the 3rd lens combination G3 also can be made as by: be 2 group of 3 chip architecture that the cemented lens of the negative lens L33 of the positive lens L32 of positive lens L31, meniscus shape of meniscus shape and meniscus shape constitutes near axis area with both-sided aspherical.
Example as shown in Figure 1 for example, also can be made as by the positive lens L41 of biconvex shape, with both-sided aspherical as the structure of the 4th lens combination G4 is 2 group of 2 chip architecture that the negative lens L42 of meniscus shape constitutes near axis area.Perhaps as shown in Figure 2 example for example, also can be made as by the cemented lens of the negative lens L42 of the positive lens L41 of biconvex shape and meniscus shape, with both-sided aspherical and near axis area as the structure of the 4th lens combination G4 is 2 group of 3 chip architecture that the positive lens L43 of biconvex shape constitutes.
The preferred related zoom lens of embodiments of the present invention constitute the formula that also meets the following conditions.In addition, also can be any 1 formula that satisfies in the following conditional as preferred mode, perhaps also can satisfy combination arbitrarily.Below, conditional and its action effect about preferred mode are described.
With the Abbe number of the negative lens L23 of the 2nd lens combination G2, when refractive index is made as v23, N23 respectively, preferably satisfy following conditional (2), (3) to the d line.
v23＞58.0…(2)
N23＜1.55…(3)
The Abbe number of conditional (2) regulation negative lens L23 is to be used to carry out the condition that good chromatic aberation is proofreaied and correct.If be lower than below the lower limit of conditional (2), then the multiplying power chromatic aberation becomes big, and follows the change that becomes chromatic aberation doubly to become big, so not preferred.
The refractive index of conditional (3) regulation negative lens L23, if surpass more than the upper limit of conditional (3), it is favourable then being configured when short in the length of the optical axis direction of the 2nd lens combination G2, but is difficult to proofread and correct well coma aberration (also claiming coma).
The focal length of the 2nd lens combination G2 is made as f2, when the focal length of the total system of wide-angle side is made as fw, preferably satisfies following conditional (4).
1.5＜|f2/fw|＜2.0…(4)
The focal length of conditional (4) regulation the 2nd lens combination G2 and in the relation of the focal length of the total system of wide-angle side.At the lower limit that is lower than conditional (4) more, when increasing the focal power of the 2nd lens combination G2 more, the focal power that each lens are born becomes excessive, is difficult to obtain good image planes characteristic.And it is big that the curvature of lens becomes, and as stating, follows the performance degradation of aberration change or foozle to become big, so not preferred.Perhaps, below the lower limit that is lower than conditional (4) more, when increasing the focal power of the 2nd lens combination G2 more, in order to prevent that lens curvature from too becoming big, need to enlarge the interval of 2 negative lens L21, L23, thereby cause maximization, and the maximization of optical system integral body of the 2nd lens combination G2, so not preferred.If surpass more than the upper limit of conditional (4), then the focal power of the 2nd lens combination G2 diminishes, and the mobile quantitative change of the 2nd lens combination G2 when becoming times is big, the maximization thereby lens combination becomes.
The focal length of the 1st lens combination is made as f1, when the focal length of the 2nd lens combination G2 is made as f2, preferably satisfies following conditional (5).
5.0＜|f1/f2|＜5.8…(5)
Conditional (5) has been stipulated the relation of the focal length of the 1st lens combination G1 and the 2nd lens combination G2, be used to obtain hypermutation doubly, the condition of miniaturization, good optical performance.If be lower than below the lower limit of conditional (5) more, the focal length of the 2nd lens combination is got over and is become big, and the focal length of the 1st lens combination diminishes more, then follows the mobile quantitative change that becomes the 2nd lens combination doubly big, is difficult to reduce lens length overall or front lens (leaning on the lens of thing side most).And the mobile quantitative change of the 4th lens combination in the distally that is visible is big, and the aberration change when becoming times becomes big.On the contrary, if surpass more than the upper limit of conditional (5), then be difficult to the various aberrations of correcting distorted well grade.
The related zoom lens of embodiments of the present invention more preferably further satisfy any or all among following conditional (1-1), (2-1), (3-1), (4-1), (5-1).Can further improve the effect that obtains by the formula that satisfies condition respectively (1), (2), (3), (4), (5) by the formula that satisfies condition respectively (1-1), (2-1), (3-1), (4-1), (5-1).In addition, for conditional (2-1) formula, becoming by the upper limit that satisfies (2-1) more helps the correction of multiplying power chromatic aberation.
|f22/f2|＞6.0…(1-1)
60.0＜v23＜83.0…(2-1)
N23＜1.52…(3-1)
1.6＜|f2/fw|＜1.90…(4-1)
5.1＜|f1/f2|＜5.7…(5-1)
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, the material of the chemicals of the anti-anti-grease/washing agent of further preferred use etc., be water tolerance, against weather, acid resistance, the contour material of resistance to chemical reagents, and, preferably use material firm and that be difficult to fragmentation.From above situation, lean on the material of thing side preferably to use glass particularly or also can use transparent pottery most as being configured in.
When in the environment of sternness, using these zoom lens, preferably apply the multilayer film coating of protection usefulness.In addition, except protection with the coating, the reflection that also can apply the ghost image light that is used to reduce when using etc. prevents coated film.
In example shown in Figure 1, show the example of configuration optics PP between lens combination and image planes Sim, but also can replace disposing as 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 described above, zoom lens according to present embodiment, by suitably adopting above-mentioned preferred construction according to desired specification etc., even when seeking miniaturization and increase the focal power of the 2nd lens combination, also can reduce the performance degradation of following foozle or assembly error, and keep the good optical performance.
[embodiment]
Then, the numerical value embodiment to zoom lens of the present invention describes.The lens profile figure of the zoom lens of embodiment 1～embodiment 6 is shown in Fig. 1～Fig. 6 respectively.
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 basic lens data of the zoom lens that embodiment 2～6 is related, relevant zoom are shown in table 4～table 18.Following, be that the meaning of the mark in the example his-and-hers watches describes with embodiment 1, also basic identical for embodiment 2～6.
In the basic lens data of table 1, the face of textural element that Si represents to lean on most the thing side as 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, the symbol of radius-of-curvature will just be made as in the protruding situation of thing side, will be made as negatively as the protruding situation of side, and final face in the face numeric representation table that descends the hurdle most at interval and the face of image planes Sim are at interval.
And, in basic lens data, the lens that Ndj represents to lean on most the thing side as 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), vdj represents the Abbe number of j optical parameter to the d line.In addition, in basic lens data, also comprising expression aperture diaphragm St and optics PP, recording the face number on the hurdle of the face number of the face that is equivalent to aperture diaphragm St and be called the words and phrases of (aperture diaphragm).
In the basic lens data of table 1, in the face that becomes times time interval change hurdle at interval, put down in writing the symbol of D7, D14, D20, D24 respectively, record (variable) in the back of each symbol.To embodiment described later too, when becoming times, record pairing symbol in its face that changes at interval hurdle at interval and be called the statement of (variable).
Focal distance f, the F that is illustrated in the total system of wide-angle side and telescope end in the data of the relevant zoom of table 2 count Fno., full field angle 2 ω, follow and become doubly and the value of each the face interval D 7 that changes, D14, D20, D24.
In the basic lens data of table 1, add * number at aspheric number, represent the numerical value of paraxial radius-of-curvature as aspheric radius-of-curvature.Represent the lens symbol of non-spherical lens, aspheric number, relevant each aspheric asphericity coefficient at the aspherical surface data of table 3." E-0n " (n: integer) mean " * 10 of the numerical value of the aspherical surface data of table 3
-n".In addition, 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, therein as an example, the unit of length uses " mm " in table 1～table 3, uses " degree " in the unit of angle, in the unit use " mm " of Zd, the h of formula (A).But,,, also can use other suitable unit so unit is not limited to " mm " even optical system magnification ratio or scale down also can obtain equal optical property.
Table 1
(*: aspheric surface)
Table 2
Table 3
Table 4
(*: aspheric surface)
Table 5
Table 6
Table 7
(*: aspheric surface)
Table 8
Table 9
Table 10
(*: aspheric surface)
Table 11
Table 12
Table 13
(*: aspheric surface)
Table 14
Table 15
Table 16
(*: aspheric surface)
Table 17
Table 18
Conditional (1)～(5) corresponding value in table 19 expression and embodiment 1～6.As known from Table 19, embodiment 1～6 formula (1)～(5) that all satisfy condition.
Table 19
At the zoom lens of Fig. 7 (A)～Fig. 7 (H) expression embodiment 1 each aberration diagram in the spherical aberration (also claiming spherical aberration) of wide-angle side and telescope end, 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 spherical aberration of the wide-angle side of the zoom lens of Fig. 8 (A)～Fig. 8 (H), Fig. 9 (A)～Fig. 9 (H), Figure 10 (A)～Figure 10 (H), Figure 11 (A)～Figure 11 (H), Figure 12 (A)～Figure 12 (H) expression embodiment 2～6 and telescope end, astigmatism, distortion (distortion aberration), multiplying power chromatic aberation.
From above data as can be known the zoom lens of embodiment 1～6 have high magnification about 20 times, seek miniaturization and be about 63～68 degree in the full field angle of wide-angle side, the F number is little of about 1.9, and 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 be used for the camera head of surveillance camera, video camera, electronic still video camera etc.
Represent to use the related zoom lens 1 of embodiments of the present invention and the structural drawing of the video camera 10 that constitutes at Figure 13 as an example of the camera head of embodiments of the present invention.In addition, in Figure 13, schematically 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, additional two arrows on the 2nd lens combination G2 that when becoming times, moves and the 4th lens combination G4.
The image that zoom lens 1 are taken is imaged on the shooting face of imaging apparatus 4, and the output signal from imaging apparatus 4 of relevant this image carries out calculation process by signal processing circuit 5, shows these images in display device 6.
In addition, the camera head that the so-called one-board that utilizes 1 imaging apparatus 4 is arranged in Figure 13 diagram, but as camera head of the present invention, also can between zoom lens 1 and imaging apparatus 4, be inserted with and be divided into R (red), G (green), B colour splitting prisms of all kinds such as (indigo plants), and use camera head corresponding to the what is called 3 plate modes of 3 imaging apparatuss of all kinds.
The related zoom lens of embodiments of the present invention are because of having above-mentioned advantage, so its productivity of the camera head of present embodiment is good, the image that can constitute, can access high image quality small-sizedly.
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 in the value shown in above-mentioned each numerical value embodiment, and the value that can get other.
Claims (7)
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 successively from the thing side: the 1st negative lens; With the meniscus shaped lens of convex surface towards the thing side; The 2nd negative lens; Positive lens,
The focal length of above-mentioned meniscus shaped lens is made as f22, when the focal length of above-mentioned the 2nd lens combination is made as f2, satisfies following conditional (1):
|f22/f2|＞5.0…(1)。
2. zoom lens as claimed in claim 1 is characterized in that,
With the Abbe number to the d line of above-mentioned the 2nd negative lens, when refractive index is made as v 23, N23 respectively, satisfy following conditional (2), (3):
v23＞58.0…(2)
N23＜1.55…(3)。
3. zoom lens as claimed in claim 1 or 2 is characterized in that,
Above-mentioned meniscus shaped lens has 1 aspheric surface at least.
4. as each the described zoom lens in the claim 1 to 3, it is characterized in that,
Above-mentioned meniscus shaped lens is made of plastic material.
5. as each the described zoom lens in the claim 1 to 4, it is characterized in that,
When the total system focal length of wide-angle side is made as fw, satisfy following conditional (4):
1.5＜|f2/fw|＜2.0…(4)。
6. as each the described zoom lens in the claim 1 to 5, it is characterized in that,
When the focal length of above-mentioned the 1st lens combination is made as f1, satisfy following conditional (5):
5.0＜|f1/f2|＜5.8…(5)。
7. camera head is characterized in that possessing:
The described zoom lens of in the claim 1 to 6 each.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2008315674A JP2010139724A (en) | 2008-12-11 | 2008-12-11 | Zoom lens and imaging apparatus |
| JP2008-315674 | 2008-12-11 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101750722A true CN101750722A (en) | 2010-06-23 |
| CN101750722B CN101750722B (en) | 2011-12-28 |
Family
ID=42349927
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009102590445A Expired - Fee Related CN101750722B (en) | 2008-12-11 | 2009-12-09 | Zooming lens and camera device |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP2010139724A (en) |
| CN (1) | CN101750722B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102023374A (en) * | 2009-09-11 | 2011-04-20 | 三星电子株式会社 | Compact zoom optical system |
| CN103135209A (en) * | 2011-12-05 | 2013-06-05 | 三星泰科威株式会社 | Zoom lens system and photographing apparatus |
| CN108020911A (en) * | 2017-12-14 | 2018-05-11 | 中国科学院西安光学精密机械研究所 | 30-time medium wave infrared zooming optical system with ultra-long focal length |
| CN114518646A (en) * | 2021-10-27 | 2022-05-20 | 福建福光股份有限公司 | Wide-band continuous zooming camera lens |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012237953A (en) * | 2011-04-25 | 2012-12-06 | Nikon Corp | Variable power optical system, optical device, and method for manufacturing variable power optical system |
| US9523843B2 (en) | 2010-07-30 | 2016-12-20 | Nikon Corporation | Zoom lens, optical apparatus, and method for manufacturing zoom lens |
| 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 |
| JP6413392B2 (en) * | 2014-06-30 | 2018-10-31 | 株式会社シグマ | Optical system |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3710261B2 (en) * | 1997-07-02 | 2005-10-26 | キヤノン株式会社 | Rear focus zoom lens and imaging apparatus using the same |
| JP4919330B2 (en) * | 2005-10-31 | 2012-04-18 | 富士フイルム株式会社 | Zoom lens |
| JP5028104B2 (en) * | 2007-02-19 | 2012-09-19 | キヤノン株式会社 | Zoom lens and imaging apparatus having the same |
| JP5197262B2 (en) * | 2008-09-16 | 2013-05-15 | キヤノン株式会社 | Zoom lens and imaging apparatus having the same |
-
2008
- 2008-12-11 JP JP2008315674A patent/JP2010139724A/en not_active Withdrawn
-
2009
- 2009-12-09 CN CN2009102590445A patent/CN101750722B/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102023374A (en) * | 2009-09-11 | 2011-04-20 | 三星电子株式会社 | Compact zoom optical system |
| CN102023374B (en) * | 2009-09-11 | 2014-12-10 | 三星电子株式会社 | Compact zoom optical system |
| CN103135209A (en) * | 2011-12-05 | 2013-06-05 | 三星泰科威株式会社 | Zoom lens system and photographing apparatus |
| CN103135209B (en) * | 2011-12-05 | 2017-08-15 | 韩华泰科株式会社 | Zoom lens system and capture apparatus |
| CN108020911A (en) * | 2017-12-14 | 2018-05-11 | 中国科学院西安光学精密机械研究所 | 30-time medium wave infrared zooming optical system with ultra-long focal length |
| CN108020911B (en) * | 2017-12-14 | 2023-02-14 | 中国科学院西安光学精密机械研究所 | 30-time medium wave infrared zooming optical system with ultra-long focal length |
| CN114518646A (en) * | 2021-10-27 | 2022-05-20 | 福建福光股份有限公司 | Wide-band continuous zooming camera lens |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101750722B (en) | 2011-12-28 |
| JP2010139724A (en) | 2010-06-24 |
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