CN1739052A - Zoom lens and image pickup apparatus - Google Patents
Zoom lens and image pickup apparatus Download PDFInfo
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- CN1739052A CN1739052A CN 200380108846 CN200380108846A CN1739052A CN 1739052 A CN1739052 A CN 1739052A CN 200380108846 CN200380108846 CN 200380108846 CN 200380108846 A CN200380108846 A CN 200380108846A CN 1739052 A CN1739052 A CN 1739052A
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Abstract
A zoom lens comprising a first lens group having a positive refracting power, a second lens group having a negative refracting power, a third lens group having a positive refracting power, and a fourth lens group having a positive refracting power arranged sequentially from the object side, wherein the first and third lens groups are fixed, the second lens group is moved in the direction of the optical axis principally for the purpose of varying magnification and the fourth lens group is moved in the direction of the optical axis for the purpose of correcting variation in the image position and focusing, characterized in that the first lens group consists of five lenses arranged sequentially from the object side, i.e. a concave lens, a convex lens directing the strong convex face toward the image side, a cemented lens of a concave lens directing the strong concave face toward the image side and a convex lens, and a convex lens directing the strong convex face toward the image side, and satisfies following conditional expressions; (1) 1.25<h1-1/h1-4<1.55, (2) d1-2/d1-3<0.4, (3) 1.65<n1-2 and (4) 0.1<H1'/f1<0.6.
Description
Technical field
The present invention relates to a kind of zoom lens of novelty, specifically, relate to a kind of zoom lens that is suitable for video camera or digital camera, and the image pick up equipment that uses this zoom lens.Specifically, the present invention relates to a kind of technology that miniature zoom lens is provided, in obtaining the process of wide-angle zoom lens, on the basis of conventional art, replenish the open-and-shut lens of structure in addition for the object side of zoom lens, thereby realize overall system is carried out the aberration correction of balance, thus the various aberrations except distortion are suitably proofreaied and correct, and this miniature zoom lens has minimum front lens diameter, in addition, also provides a kind of image pick up equipment, wherein, by the vision signal that obtains from image pick-up element is handled, the distortion that is caused by above-mentioned zoom lens is proofreaied and correct, thus the image that obtains making with extra care.
Background technology
In the zoom lens that is mainly used in consumer's video camera, main flow is a focus zoom system, pancreatic system (four group inner focus zoom system) in so-called four groups, it has four groups of structures, wherein, the configuration of refracting power (refracting power) is positive and negative from object side, just and just, wherein, first lens combination and the 3rd lens combination are fixed, mainly change enlargement factor, come image position change is proofreaied and correct and focused on by move the 4th lens combination along optical axis direction by the position of moving second lens combination along optical axis direction.As the configuration of the zoom lens relevant, many different patterns have been proposed, as being the pattern of describing in the Japanese patent application of Hei3-33710 and Hei4-153615 at disclosed sequence number with this system.
In the structure of these camera lenses, the lens arrangement of first lens combination and second lens combination has used the closely similar lens of type, and therefore, in wide-angle side, cornerwise visual angle of the image that picks up is about 60 degree at the most.For example, at disclosed sequence number is that the camera lens described in the Japanese patent application of 2000-28922 is tried hard to the surface of the most close image side of more close first lens combination of principal point (principal point) of the image side by making first lens combination and realized the miniaturization of front lens diameter, but can not realize the visual angle broadening of wide-angle side is spent to being not less than 60, therefore can not and make between the miniaturization of front lens diameter and realize taking into account at the exhibition wide-angle.
As a kind of example of trying hard to realize making the abundant broadening of angle, at disclosed sequence number is to have described a known example in the Japanese patent application of Hei5-72475, it is on the basis of the Japanese patent application of Hei3-33710 at disclosed sequence number, has developed first lens combination from three lens arrangements to five lens arrangements.
In addition, proposed to utilize the electric signal treatment technology, the distortion that changes with zoom (variable power) has been proofreaied and correct in image pick up equipment one side.For example, the known disclosed sequence number Japanese patent application that is Hei6-165024.
At disclosed sequence number is to describe in the Japanese patent application of Hei5-72475, based on being in the zoom lens of the lens type shown in the Japanese patent application of Hei3-33710 at disclosed sequence number, reduced to tilt to the chief ray of the lens of the 3rd lens of first lens combination and back, thereby can be by arranging that at the object side of first lens combination having large space concavees lens and convex lens at interval therebetween comes various aberrations are proofreaied and correct, so that increase configuration, as the wide-angle conversion lens near afocal system.
But,, need arrange two extra lens at interval with large space, thereby increase the diameter of front lens inevitably for to the distortion and the warp-wise curvature of field of multiplicative wide-angle side are proofreaied and correct evenly by the exhibition wide-angle.In addition, because the purpose of the zoom lens of this invention only is to make disclosed sequence number the angle broadening of the lens construction of the Japanese patent application that is Hei3-33710, so it is by the lens arrangement of first lens combination to the, four lens combination is accurately regulated realization.Consider that the optimum lens structure of hope is always not available as technical requirements such as zoom ratio, f-number (F-number), front lens diameter, total length and back focuses.
Theme of the present invention provides a kind of wide-angle zoom lens that can be fit to various technical requirements to greatest extent, by making first lens combination make with disclosed sequence number is the five different lens arrangements of Japanese patent application of Hei5-72475, in conjunction with many different the variation to focus system zoom lens in so-called four groups, can with at the angle broadening at the visual angle of wide-angle side to being not less than 60 degree, and make the increase minimum of front lens diameter, realized the exhibition wide-angle and made the coordination between minimizing of front lens diameter, in addition, also will be applied to the 3rd lens combination and the 4th lens combination to the many different variation of conventional version.
In addition, can further realize miniaturization in such a way, wherein, utilize vision signal handle to because realize the exhibition wide-angle and make the front lens diameter between minimizing coordination and the distortion that is difficult to its correction that becomes is inevitably proofreaied and correct, and, can obtain from image planes after distortion correction, the visual angle of wide-angle side is redefined with the ratio of taking the photograph the visual angle of far-end and is zoom ratio, has reduced paraxial zoom ratio (General Definition of zoom ratio) thus.Theme of the present invention provides a kind of image pick up equipment, this image pick up equipment is by causing barrel distortion in wide-angle side on one's own initiative and to a great extent, cause pincushion distortion taking the photograph far-end, feasible change for paraxial focal length, the variation of having carried out the visual angle after the distortion correction is enough big, can realize miniaturization reaching under the situation of required zoom ratio.
Summary of the invention
In order to solve described problem, zoom lens of the present invention is made up of first lens combination with positive refracting power, second lens combination with negative refracting power, the 4th lens combination that has the 3rd lens combination of positive refracting power and have a positive refracting power, these lens combination are from the object side arranged in sequence, wherein, first lens combination and the 3rd lens combination are fixed, zoom lens mainly changes enlargement factor (zoom) by move second lens combination along optical axis direction, come image position change is proofreaied and correct and focused on by move the 4th lens combination along optical axis direction, wherein:
First lens combination is made up of following five lens: concavees lens; Convex lens with very strong convexity towards the image side; By concavees lens with very strong concavity towards the image side and the cemented lens (cemented lens) that convex lens constitute; And the convex lens with very strong convexity towards object side, these lens are from the object side arranged in sequence, and each expression formula in be configured to meet the following conditions expression formula (1), (2), (3) and (4):
(1)1.25＜h1-1/h1-4＜1.55；
(2)d1-2/d1-3＜0.4；
(3) 1.65＜n1-2; And
(4)0.1＜H1′/f1＜0.6，
In the formula:
F1 is the focal length of first lens combination;
H1-i is for when allowing the paraxial rays parallel with optical axis to enter first lens combination, at the height of the paraxial rays in i face of object side;
D1-i is in first lens combination, from the axially spaced-apart of the individual face of an i face to the (i+1);
N1-i is in first lens combination, the d line refractive index (refractive index) of i face; And
H1 ' is the interval ("-" expression object side, "+" expression image side) of the image side principal point of summit in first lens combination of the face of the most close image side from first lens combination.
Therefore, in zoom lens of the present invention, can proofread and correct, and satisfy the exhibition wide-angle simultaneously and made the miniaturization of front lens diameter various aberrations.
Image pick up equipment of the present invention comprises: zoom lens; Image pick-up device, the image transitions that is used for being caught by zoom lens is an electrical picture signal; And image control apparatus.Image control apparatus is configured to form new picture signal and export new picture signal through coordinate transform, wherein, coordinate transform is the coordinate transforming coefficient that provides in advance with reference to according to the variable magnification through zoom lens, will be shifted by the point on the defined image of the picture signal that image pick-up device forms.Zoom lens is made up of first lens combination with positive refracting power, second lens combination with negative refracting power, the 4th lens combination that has the 3rd lens combination of positive refracting power and have a positive refracting power, these lens combination are from the object side arranged in sequence, wherein, first lens combination and the 3rd lens combination are fixed, zoom lens mainly changes enlargement factor by move second lens combination along optical axis direction, comes image position change is proofreaied and correct and focused on by move the 4th lens combination along optical axis direction.First lens combination is made up of following five lens: concavees lens; Convex lens with very strong convexity towards the image side; By concavees lens with very strong concavity towards the image side and the cemented lens that convex lens constitute; And the convex lens with very strong convexity towards object side, these lens are from the object side arranged in sequence, and each expression formula in the expression formula that is configured to meet the following conditions: (1) 1.25＜h1-1/h1-4＜1.55; (2) d1-2/d1-3＜0.4; (3) 1.65＜n1-2; And (4) 0.1＜H1 '/f1＜0.6, in the formula: f1 is the focal length of first lens combination; H1-i is for when allowing the paraxial rays parallel with optical axis to enter first lens combination, at the height of the paraxial rays in i surface of object side; D1-i is in first lens combination, from the axial spacing on i surface to the (i+1) surface; N1-i is in first lens combination, the d line refractive index on i surface; And H1 ' is the interval ("-" expression object side, "+" expression image side) of the image side principal point of summit in first lens combination of the face of the most close image side from first lens combination.
Therefore, in image pick up equipment of the present invention, by causing barrel distortion in wide-angle side on one's own initiative and to a great extent, cause pincushion distortion taking the photograph far-end, thereby make that for the variation of paraxial focal length the variation at the visual angle after having carried out distortion correction is enough big, can realize miniaturization reaching under the situation of required zoom ratio.
Description of drawings
Fig. 1 is for showing the synoptic diagram of first preferred embodiment of zoom lens of the present invention with Fig. 2 to Fig. 4, and Fig. 1 has specifically illustrated lens arrangement;
Fig. 2 shows spherical aberration, astigmatism and the distortion in wide-angle side;
Fig. 3 shows in wide-angle side and spherical aberration, astigmatism and the distortion of taking the photograph the middle burnt position between the far-end;
Fig. 4 shows and is taking the photograph the spherical aberration of far-end, astigmatism and distortion;
Fig. 5 is for showing the synoptic diagram of second preferred embodiment of zoom lens of the present invention with Fig. 6 to Fig. 8, and Fig. 5 has specifically illustrated lens arrangement;
Fig. 6 shows spherical aberration, astigmatism and the distortion in wide-angle side;
Fig. 7 shows in wide-angle side and spherical aberration, astigmatism and the distortion of taking the photograph the middle burnt position between the far-end;
Fig. 8 shows and is taking the photograph the spherical aberration of far-end, astigmatism and distortion;
Fig. 9 is for showing the synoptic diagram of the 3rd preferred embodiment of zoom lens of the present invention with Figure 10 to Figure 12, and Fig. 9 has specifically illustrated lens arrangement;
Figure 10 shows spherical aberration, astigmatism and the distortion in wide-angle side;
Figure 11 shows in wide-angle side and spherical aberration, astigmatism and the distortion of taking the photograph the middle burnt position between the far-end;
Figure 12 shows and is taking the photograph the spherical aberration of far-end, astigmatism and distortion;
Figure 13 is for showing the synoptic diagram of the 4th preferred embodiment of zoom lens of the present invention with Figure 14 to Figure 16, and Figure 13 has specifically illustrated the structure of lens.
Figure 14 shows spherical aberration, astigmatism and the distortion in wide-angle side;
Figure 15 shows in wide-angle side and spherical aberration, astigmatism and the distortion of taking the photograph the middle burnt position between the far-end;
Figure 16 shows and is taking the photograph the spherical aberration of far-end, astigmatism and distortion; And
Figure 17 is the block diagram of configuration that shows the preferred embodiment of image pick up equipment of the present invention.
Implement best mode of the present invention
Be described hereinafter with reference to the preferred embodiment of accompanying drawing zoom lens of the present invention and image pick up equipment.Fig. 1 to 4 shows first preferred embodiment.Fig. 5 to 8 shows second preferred embodiment.Fig. 9 to 12 shows the 3rd preferred embodiment.Figure 13 to 16 shows the 4th preferred embodiment.
As Fig. 1, Fig. 5, Fig. 9 and shown in Figure 13, zoom lens 1,2,3 and 4 according to first to the 4th preferred embodiment has the optical system of being made up of the first lens combination Gr1, the second lens combination Gr2, the 3rd lens combination Gr3 and the 4th lens combination Gr4, and wherein: the first lens combination Gr1 has positive refracting power; The second lens combination Gr2 has negative refracting power and can move along optical axis direction, mainly in order to carry out zoom (variable enlargement factor); The 3rd lens combination Gr3 has positive refracting power; And the 4th lens combination Gr4 have positive refracting power and can move along optical axis direction so that the change of focusing position is proofreaied and correct and focused on during zoom, these lens combination are from the object side arranged in sequence.
In the 3rd lens combination Gr3 and the desired configuration of the 4th lens combination Gr4, each above-mentioned zoom lens 1,2,3 is different with 4.Each above-mentioned zoom lens to the first lens combination Gr1 and the second lens combination Gr2 require identical.
In zoom lens 1,2,3 and 4, the first lens combination Gr1 is made up of following five lens: concavees lens L1; Convex lens L2 with very strong convexity towards the image side; By concavees lens L3 with very strong concavity towards the image side and the cemented lens that concavees lens L4 constitutes; And the convex lens L5 with very strong convexity towards object side, these lens are from the object side arranged in sequence, and each expression formula in the expression formula that meets the following conditions (1), (2), (3) and (4):
(1)1.25＜h1-1/h1-4＜1.55；
(2)d1-2/d1-3＜0.4；
(3) 1.65＜n1-2; And
(4)0.1＜H1′/f1＜0.6，
In the formula:
F1 is the focal length of first lens combination;
H1-i is for when allowing the paraxial rays parallel with optical axis to enter first lens combination, at the height of the paraxial rays in i surface of object side;
D1-i is in first lens combination, from the axial spacing on i surface to the (i+1) surface;
N1-i is in first lens combination, the d line refractive index of i lens; And
H1 ' is the interval ("-" expression object side, "+" expression image side) of the image side principal point of summit in first lens combination of the face of the most close image side from first lens combination.
Conditional expression (1) will be even expression will be applied to the lens configuration of the lens of concavees lens L3 and back near the configuration of conventional situation, by utilizing concavees lens L1 and convex lens L2 to adopt to approach not have focus the configuration of (afocal), also can fully proofread and correct, reduce the condition of the inclination of the chief ray that enters concavees lens L3 thus aberration.Be lower than lower limit and can make the inclination that is difficult to fully reduce the chief ray that enters concavees lens L3.Being higher than the upper limit can increase synthetic thickness from concavees lens L1 to convex lens L2, and the size of front lens is increased, and makes the miniaturization that is difficult to realize the front lens diameter thus, and this purpose of the present invention just.
Conditional expression (2) makes the condition of the diameter of front lens less than conventional situation when being illustrated in the expression formula that satisfies condition (1).When the chief ray among inclination of the chief ray in the space interval between concavees lens L1 and the convex lens L2 and the convex lens L2 was tilted to compare, the chief ray during by convex lens L2 tilted less.Therefore, in order to obtain identical result,, above-mentioned space interval is reduced and the thickness that increases convex lens L2 is favourable for the front lens diameter is minimized by conditional expression (1).Therefore, the condition precedent that realizes purpose of the present invention is the thickness that increases convex lens L2, rather than reduces above-mentioned space interval.The lower limit of this conditional expression is the effective diameter that determines according to the outer luminous flux of axle by concavees lens L1 outermost, and be make concavees lens L1 and convex lens L2 can be configured the value that is in contact with one another.
Expression formula (3) expression tilts to make the minimized condition of front lens diameter by the chief ray that further reduces in the convex lens L2.Being lower than lower limit can increase the thickness of the convex lens L2 of the expression formula that satisfies condition (1).As a result, can increase the diameter of front lens.
Conditional expression (4) expression approaches afocal configuration by utilizing concavees lens L1 and convex lens L2 to adopt, and the condition of the first lens combination Gr1 with the configuration that is suitable for being implemented in the coordination between minimizing of exhibition wide-angle and front lens diameter is provided.Distribute by the refracting power that defines each lens, the principal point of the image side of the lens combination Gr1 that wins is generated on the surface of the close enough image side of the first lens combination Gr1 rather than the most close image side, can when satisfying exhibition wide-angle and the miniaturization of front lens diameter, obtain fully high variable enlargement factor ratio.
In zoom lens 1,2,3 and 4, the second lens combination Gr2 is made up of following three lens, promptly, recessed meniscus lens L6 with very strong concavity towards the image side, biconcave lens L7 and convex lens L8, these lens are from the object side arranged in sequence, and the expression formula that satisfies condition (5):
(5)1.8＜(n2-1+n2-2)/2，
In the formula:
N2-1 is the d line refractive index of the recessed meniscus lens of second lens combination;
N2-2 is the d line refractive index of the biconcave lens of second lens combination.
Conditional expression (5) is used to prevent carry out the curvature of field, and to proofread and correct needed Pei Ciwaer and (Petzval sum) too small.The structure of the first lens combination Gr1 is identical with so-called retrofocus type, and wherein, the principal point of image side stretches to the image side, therefore, the first lens combination Gr1 intrinsic Pei Ciwaer and be positive and value very little.This can make the Pei Ciwaer of total system and too small, but this is inevitable and is inevitable.For the Pei Ciwaer that makes total system be appropriate value, can consider to reduce the second lens combination Gr2 refracting power method or increase the method for refracting power of the concavees lens of the second lens combination Gr2.But if reduce the refracting power of the second lens combination Gr2, the amount of movement of the second lens combination Gr2 that then variable enlargement factor is required increases, and total system is enlarged.Therefore, the mean value of refracting power that need make the recessed meniscus lens L6 of the second lens combination Gr2 and biconcave lens L7 is beneficial to the curvature of field is proofreaied and correct in the scope of conditional expression (5).
About the structure of the 3rd lens combination and the 4th lens combination, has following structure according to the zoom lens 1 of first preferred embodiment of the present invention.
As Fig. 1 finding, the 3rd lens combination Gr3 is made of single convex lens L9, and at least one surface is an aspheric surface.The 4th lens combination Gr4 comprises that the surface by recessed meniscus lens L10 with very strong concavity towards the image side and image side is that the biconvex lens L11 of aspheric surface constitutes cemented lens, and these lens are from the object side arranged in sequence.These lens satisfy following each conditional expression (6), (7) and (8):
(6)-0.4＜f3/r3-2＜0.4；
(7)-1.25＜r4-1/r4-3＜-0.8; And
(8)0.3＜-2/f4＜0.6，
In the formula:
F3 is the focal length of the 3rd lens combination;
F4 is the focal length of the 4th lens combination;
R3-2 is the radius-of-curvature of the image side surface of the convex lens in the 3rd lens combination;
R4-1 is the radius-of-curvature of the object side surface of the recessed meniscus lens in the 4th lens combination;
R4-2 is the radius-of-curvature of the adhesive surface in the 4th lens combination; And
R4-3 is the radius-of-curvature of the image side surface of the convex lens in the 4th lens combination.
Conditional expression (6) has defined the shape of the aspheric single convex lens L9 of the 3rd lens combination Gr3, and has defined and relate to and the off-centre (misalignment) when forming aspheric surface and the condition of the eccentric relatively relevant susceptibility between the 3rd lens combination Gr3 and the 4th lens combination Gr4.The degree of eccentricity on two surfaces of non-spherical lens depends on the degree of eccentricity of mould.For example, glass molds can produce the off-centre of about 10 μ m.In addition, when in lens barrel, assembling, between the 3rd lens combination Gr3 and the 4th lens combination Gr4, can produce the relative eccentric of about 20 μ m.Even under the situation that such error occurs, the picture quality of works also can fully be reproduced design performance, and design is proposed such requirement, that is, the off-centre between each surface is reduced to this susceptibility that picture quality influences.Being higher than the upper limit can increase off-centre between each surface to this susceptibility of picture quality influence, to being shaped and the precision of matching requirements can surpass working ability, thereby is difficult to realize the batch process of stable performance.Being lower than lower limit can be difficult to evenly the spherical aberration and the curvature of field suitably be proofreaied and correct.
Conditional expression (7) is relevant with the eccentric susceptibility of the 4th lens combination Gr4.Be lower than on the object side surface that positive refracting power that lower limit can make the 4th lens combination Gr4 concentrates on recessed meniscus lens L10 (its radius-of-curvature is r4-1), become obviously by the off-centre on this surface and the aberration deterioration of tilting to cause, therefore be difficult in batch process, stably realize design performance.Even the 4th lens combination Gr4 has the error of eccentric and inclination aspect, also can be dispersed in the object side surface of recessed meniscus lens L10 by the positive refracting power that suitably makes the 4th lens combination Gr4 and in the image side surface of biconvex lens L11 (its radius-of-curvature is r4-3), reduce the susceptibility that aberration is worsened.But being higher than the upper limit can increase the spherical aberration that produces from the image side surface of biconvex lens L11, and can be difficult to proofread and correct.
Above-mentioned conditional expression (8) with proofread and correct relevant to the intelligent image difference and the curvature of field.Under the radius-of-curvature r4-2 of the adhesive surface between recessed meniscus lens L10 with negative refracting power and the biconvex lens L11 satisfies condition the situation of expression formula (7), if attempt to determine the glass material of recessed meniscus lens L10 and biconvex lens L11, then can not obtain very big design freedom according to the condition of chromatic aberration correction.But,, therefore require glass material is selected, with the expression formula that satisfies condition (7) and (8) because the shape of above-mentioned adhesive surface has the determinacy effect to carrying out the correction of the intelligent image difference and the curvature of field.Being higher than the upper limit causes the result to be, even when the difference with the refractive index between recessed meniscus lens L10 and the biconvex lens L11 designs very greatly, the negative refracting power of the adhesive surface of two lens (recessed meniscus lens L10 and biconvex lens L11) also can become too small, therefore is difficult to the inside intelligent image difference and the curvature of field of tending to downside are proofreaied and correct.Be lower than lower limit and can cause the intelligent image of color poor, wherein, the g alignment jumps to the glazed thread side of the outer luminous flux of axle outward, and becoming clearly and proofreading and correct to become is difficult to carry out.
About the structure of the 3rd lens combination and the 4th lens combination, has following structure according to the zoom lens 2 of second preferred embodiment of the present invention.
As Fig. 5 finding, in zoom lens 2, the 3rd lens combination Gr3 comprises convex lens G9 and by the convex lens G10 with very strong convexity towards object side with have the cemented lens that the concavees lens G11 of very strong concavity towards the image side constitutes, these lens are from the object side arranged in sequence, and at least one surface is an aspheric surface.The 4th lens combination Gr4 is made up of single convex lens G12, and at least one surface is an aspheric surface.These lens combination each conditional expression in expression formula (9) and (10) that meets the following conditions:
(9) 0.4＜h3-5/h3-1＜0.7; And
(10)0.75＜f3/f3-1＜1
In the formula:
H3-i is for when when the wide-angle side permission paraxial rays parallel with optical axis enters the first lens combination Gr1, at the height of the paraxial rays from i surface of the object side of the 3rd lens combination Gr3;
F3 is the focal length of the 3rd lens combination Gr3; And
F3-1 is the focal length of the single convex lens of the 3rd lens combination Gr3.
The condition of total length is shortened in conditional expression (9) expression by the focal length that shortens the 4th lens combination Gr4.Be higher than the effect that the upper limit can cause can not get significantly shortening total length.Be lower than lower limit and can cause Pei Ciwaer and become too small, and be difficult to the curvature of field is proofreaied and correct.
Above-mentioned conditional expression (10) is relevant with the eccentric susceptibility as the convex lens G9 of first lens of the 3rd lens combination Gr3.In determining the process of each surperficial refracting power distribution of the 3rd lens combination Gr3 with the expression formula that satisfies condition (9), if too much positive refracting power burden concentrates on the convex lens G9, then when off-centre or droop error occurring among the convex lens G9, aberration worsens and to become obviously, and is difficult to the performance that keeps stable in batch process.Therefore, making convex lens G10 as second lens of the 3rd lens combination Gr3 share a part of refracting power is very important to be no more than the upper limit.Be lower than lower limit and can cause, need to increase the convex lens G10 of the cemented lens that constitutes the 3rd lens combination Gr3 and the gross thickness of concavees lens G11 for the expression formula that satisfies condition (9).Therefore,, can not realize shortening total length, therefore can not realize the purpose of miniaturization of the present invention even when back focus is shortened.
About the structure of the 3rd lens combination Gr3 and the 4th lens combination Gr4, has following structure according to the zoom lens 3 of the 3rd preferred embodiment of the present invention.
As Fig. 9 finding, the 3rd lens combination Gr3 is made up of single convex lens L9, and at least one surface is an aspheric surface.The 4th lens combination Gr4 comprises that these lens are from the object side arranged in sequence by convex lens L10, concavees lens L11 with very strong convexity towards object side and the cemented lens that convex lens L12 constitutes.In addition, the surface of close object side is an aspheric surface at least.These lens each expression formula in expression formula (11) and (12) that meets the following conditions:
(11) n4-2＞1.8; And
(12)0.1＜f3/f4＜0.7，
In the formula:
N4-2 is the d line refractive index of the concavees lens of the 4th lens combination;
F3 is the focal length of the 3rd lens combination; And
F4 is the focal length of the 4th lens combination.
Conditional expression (11) has defined the glass material of the concavees lens L11 of the 4th lens combination Gr4.By increasing refractive index, the curvature of the adhesive surface between concavees lens L10 and the convex lens L12 is reduced, therefore, the refraction change that is caused by the color relevant with aberration and spherical aberration there is inhibiting effect, and, to proofreading and correct Pei Ciwaer and effect arranged, wherein towards positive side, aberration and spherical aberration are to be caused by the 4th the mobile of lens combination Gr4, and this is favourable for the curvature of field is proofreaied and correct.
Conditional expression (12) is relevant with the focal length of the 3rd lens combination Gr3 and the 4th lens combination Gr4.Be lower than the change that lower limit can be difficult to suppress spherical aberration, the amount of movement of the 4th lens combination Gr4 is increased, total length is increased.Being higher than the upper limit can increase the aberration that the foozle by the 4th lens combination Gr4 causes, this is disadvantageous.
About the structure of the 3rd lens combination and the 4th lens combination, has following structure according to the zoom lens 4 of the 4th preferred embodiment of the present invention.
As Figure 13 finding, in zoom lens 4, the 3rd lens combination Gr3 comprises convex lens G9 and by the convex lens G10 with very strong convexity towards object side with have the cemented lens that the concavees lens G11 of very strong concavity towards the image side constitutes, these lens are from the object side arranged in sequence, and at least one surface is an aspheric surface.The 4th lens combination Gr4 comprises by biconvex lens L12 and the cemented lens that is made of the concavees lens L13 with very strong convexity towards the image side, and at least one surface is an aspheric surface.These lens combination each expression formula in expression formula (9), (11) and (13) that meets the following conditions:
(9)0.4＜h3-5/h3-1＜0.7；
(11) n4-2＞1.8; And
(13)0.75＜f3/f3-1＜1.3，
In the formula:
H3-i is for when when the wide-angle side permission paraxial rays parallel with optical axis enters the first lens combination Gr1, at the height of the paraxial rays from i surface of the object side of the 3rd lens combination Gr3;
F3 is the focal length of the 3rd lens combination Gr3;
F3-1 is the focal length of the single convex lens of the 3rd lens combination Gr3; And
N4-2 is the d line refractive index of the concavees lens of the 4th lens combination.
The condition of total length is shortened in conditional expression (9) expression by the focal length that shortens the 4th lens combination Gr4.Be higher than the effect that the upper limit can cause can not get significantly shortening total length.Be lower than lower limit and can cause Pei Ciwaer and become too small, and be difficult to the curvature of field is proofreaied and correct.
Conditional expression (11) has defined the glass material of the concavees lens L13 of the 4th lens combination Gr4.By increasing refractive index, curvature with the adhesive surface of biconvex lens L12 is reduced, therefore, refraction change to the aberration that caused by color and spherical aberration has inhibiting effect, and, to proofreading and correct Pei Ciwaer and effect arranged, wherein towards positive side, aberration and spherical aberration are to be caused by the 4th the mobile of lens combination Gr4, and this is favourable for the curvature of field is proofreaied and correct.
Conditional expression (13) is relevant with the eccentric susceptibility as the convex lens L9 of first lens of the 3rd lens combination Gr3.In determining the process of each surperficial refracting power distribution of the 3rd lens combination Gr3 with the expression formula that satisfies condition (9), if too much positive refracting power burden concentrates on the convex lens L9, then when in convex lens L9, off-centre or droop error occurring, aberration worsens and to become clearly, and is difficult to the performance that keeps stable in batch process.Therefore, making convex lens L10 as second lens of the 3rd lens combination Gr3 share the positive refracting power of a part is very important to be no more than the upper limit.Be lower than lower limit and can cause, need to increase the convex lens L10 of the cemented lens that constitutes the 3rd lens combination Gr3 and the gross thickness of concavees lens L11 for the expression formula that satisfies condition (9).Even when back focus is shortened, can not realize making total length to shorten, therefore can not realize the purpose of miniaturization of the present invention.
Figure 17 is the block diagram that shows according to the example of structure of image pick up equipment 100 of the present invention.In Figure 17, the image pickup device camera lens that numeral 101 expressions can zoom, it is equipped with condenser lens 101a and transducer lens (variator lens) 101b; 102 presentation video pickup device such as CCD; 103 presentation video control circuits are used to control various operations, as pattern distortion is proofreaied and correct; 104 expressions, first video memory is used to store the view data that can obtain from image pick-up element 102; And 105 expressions, second video memory is used to store the view data that distortion wherein has been corrected.Numeral 106 expression tables of data are used to store distortion information; And 107 expression Zoom switch are used for operator's zoom instructions is converted to electric signal.
For example, if will be applied to above-mentioned image pickup camera lens 101 according to the zoom lens 1,2,3 and 4 of above each preferred embodiment, then condenser lens 101a is corresponding to the 4th lens combination Gr4, and transducer lens 101b is corresponding to the second lens combination Gr2.
To Fig. 4, Fig. 6 is to Fig. 8 as Fig. 2 relevant with the distortion of image pickup camera lens 101, and to shown in Figure 16, zoom is depended in the variation of distortion curve to Figure 10 to Figure 12 and Figure 14.Therefore, the position of transducer lens 101b is depended in the change of distortion.Therefore, tables of data 106 memory mapping coordinate coefficients, it gets up the two-dimensional position informational linkage about certain position of transducer lens 101b in first video memory 104 and second video memory 105.In addition, to taking the photograph far-end, the position of transducer lens 101b is divided into many positions from wide-angle side, the coordinate transforming coefficient corresponding with their each position is stored in the tables of data 106.
If the operator operates Zoom switch 107 to change the position of transducer lens 101b, then image control circuit 103 is controlled by condenser lens 101a is moved, make focus no longer fuzzy, and image control circuit 103 also receives the coordinate transforming coefficient corresponding with the position of transducer lens 101b from tables of data 106.When the position of transducer lens 101b and the position of dividing in advance not at once, by means of as processing such as interpolations,, obtain suitable coordinate transforming coefficient according near the coordinate transforming coefficient of the position this position.The coordinate transforming coefficient is to be used for coefficient that the position of the point on the image of two dimension Discrete Distribution is moved.For the image between the point of Discrete Distribution, according to the position of finding mobile destination as processing such as interpolations.Handle by the image shift of carrying out vertical and level according to this coordinate transforming coefficient, 103 pairs of image control circuits carry out distortion correction from the information of first video memory 104 that image pick-up element 102 obtains, and, in second video memory 105, set up the image information that distortion has been corrected, then, will be output as vision signal based on the signal of the image information of in second video memory 105, setting up.
Below will be to being described according to the numerical value embodiment in the zoom lens 1,2,3 and 4 of each above-mentioned preferred embodiment.
In above-mentioned zoom lens 1,2 and 4, the aperture IR of stationkeeping is adjacent in the front of the 3rd lens combination Gr3, and optical filter FL is between the 4th lens combination Gr4 and image plane IMG.In zoom lens 3, the aperture IR of stationkeeping is adjacent in the back of the 3rd lens combination Gr3, and optical filter FL is between the 4th lens combination Gr4 and image plane IMG.
In the following description, " si " expression is from i face of object side counting; " ri " expression is from the radius-of-curvature of i the face " si " of object side counting; " di " expression is from i the face " si " of object side counting and the axially spaced-apart between (i+1) individual face " si+1 "; " ni " expression constitutes the refractive index of the material of i lens " Li " or " Gi " to d line (wavelength 587.6nm); The material of " vi " expression i lens of formation " Li " or " Gi " is refined in number (Abbe number) to the d line; " nFL " expression constitutes the refractive index of the material of optical filter FL to the d line; " vFL " expression constitutes refined the compare number of the material of optical filter F to the d line; F value (f-number) is opened in " Fno " expression; And " ω " represents half angle of view.
By the aspheric shape of following formula definition (formula 1):
In the formula, " xi " represents the aspheric degree of depth, and " H " representative is apart from the height of optical axis.
Form 1
| Si | ri | di | ni | vi |
| s1 | r1＝-20.136 | d1＝0.313 | n1＝1.88300 | v1＝40.8 |
| s2 | r2＝6.978 | d2＝0.587 | ||
| s3 | r3＝∞ | d3＝2.577 | n2＝1.83481 | v2＝42.7 |
| S4 | r4＝-6.794 | d4＝0.078 | ||
| s5 | r5＝9.228 | d5＝0.215 | n3＝1.92286 | v3＝20.9 |
| s6 | r6＝3.996 | d6＝0.785 | n4＝1.51680 | v4＝64.2 |
| s7 | r7＝59.327 | d7＝0.078 | ||
| s8 | r8＝3.907 | d8＝0.625 | n5＝1.83481 | v5＝42.7 |
| s9 | r9＝68.355 | D9=is variable | ||
| s10 | r10＝8.681 | d10＝0.176 | n6＝1.88300 | v6＝40.8 |
| s11 | r11＝1.765 | d11＝0.489 | ||
| s12 | r12＝-1.856 | d12＝0.156 | n7＝1.88300 | v7＝40.8 |
| s13 | r13＝1.728 | d13＝0.479 | n8＝1.92286 | v8＝20.9 |
| s14 | r14＝-9.711 | D14=is variable | ||
| s15 | R15=∞ (aperture) | d15＝0.692 | ||
| s16 | r16＝2.762 | d16＝0.794 | n9＝1.51680 | v9＝64.2 |
| s17 | r17＝-21.701 | D17=is variable | ||
| s18 | r18＝2.823 | d18＝0.156 | n10＝1.92286 | v10＝20.9 |
| s19 | r19＝1.698 | d19＝1.110 | n11＝1.51680 | v11＝64.2 |
| s20 | r20＝-3.111 | D20=is variable | ||
| s21 | R21=∞ (optical filter) | d21＝0.809 | nFL＝1.51680 | vFL＝64.2 |
| s22 | R22=∞ (optical filter) | D22=0.313 (back focus) |
The surperficial s20 of the image side of two surperficial s16, the s17 of the single convex lens L9 of the 3rd lens combination Gr3 and the biconvex lens L11 of the 4th lens combination Gr4 forms aspheric surface.Form 2 shows quadravalence, the 6th rank and the 8th rank asphericity coefficient A4, A6 and the A8 of above-mentioned each surperficial s16, s17 and s20.
| Asphericity coefficient | A4 | A6 | A8 |
| s16 | -0.7793×10 -2 | -0.8078×10 -2 | -0.8211×10 -3 |
| s17 | +0.6459×10 -2 | -0.8733×10 -2 | -0.8647×10 -3 |
| s20 | +0.1245×10 -1 | +0.8698×10 -3 | -0.8647×10 -3 |
In zoom lens 1, axially spaced-apart d9, d14, d17 and d20 change with zoom.Form 3 shows in wide-angle side, middle burnt position and takes the photograph focal length, f-number Fno, objective angle of image field (2 ω) and axially spaced-apart d9, d14, d17 and the d20 of far-end.
Form 3
| Wide-angle side | In burnt position | Take the photograph far-end | |
| Focal length | 1.00 | 3.42 | 5.40 |
| Fno | 1.85 | 2.20 | 2.54 |
| Objective angle of image field (2 ω) | 78.0 | 22.6 | 14.28 |
| d9 | 0.156 | 2.108 | 2.677 |
| D14 | 2.780 | 0.829 | 0.260 |
| D17 | 1.250 | 0.597 | 0.898 |
| D20 | 2.231 | 2.884 | 2.583 |
Fig. 2 shows spherical aberration, distortion and the astigmatism of the zoom lens 1 among the above-mentioned numerical value embodiment to Fig. 4.In spherical aberration diagram, solid line is represented the value of e line; Dotted line is represented the value (wavelength is 435.8nm) of g line; Dot-and-dash line is represented the value (wavelength is 656.3nm) of C line.In astigmatism figure, solid line represents to vow shape shadow table area distortion value; Dotted line is represented warp-wise image plane distortion value.
Each conditional expression (1) that below shows the numerical value embodiment of above-mentioned zoom lens 1 arrives the value of (8).
(1)h1-1/h1-4＝1.3485
(2)d1-2/d1-3＝0.228
(3)n1-2＝1.83481
(4)H1′/f1＝0.2477，f1＝3.953
(5)(n2-1+n2-2)/2＝1.88300
(6)f3/r3-2＝-0.221，f3＝4.794
(7)r4+1/r4-3＝-0.9076
(8)r4-2/f4＝0.4151，f4＝4.091
Form 4
| Si | ri | di | ni | vi |
| s1 | r1＝-14.698 | d1＝0.333 | n1＝1.88300 | v1＝40.8 |
| s2 | r2＝6.801 | d2＝0.561 | ||
| s3 | r3＝∞ | d3＝3.149 | n2＝1.85000 | v2＝43.0 |
| S4 | r4＝-6.319 | d4＝0.078 | ||
| s5 | r5＝-71.436 | d5＝0.254 | n3＝1.92286 | v3＝20.9 |
| s6 | r6＝8.047 | d6＝0.781 | n4＝1.69680 | v4＝55.5 |
| s7 | r7＝-11.279 | d7＝0.078 | ||
| s8 | r8＝3.875 | d8＝0.679 | n5＝1.77250 | v5＝49.6 |
| s9 | r9＝18.782 | D9=is variable | ||
| s10 | r10＝10.076 | d10＝0.176 | n6＝1.88300 | v6＝40.8 |
| s11 | r11＝1.918 | d11＝0.500 | ||
| s12 | r12＝-2.091 | d12＝0.156 | n7＝1.88300 | v7＝40.8 |
| s13 | r13＝1.666 | d13＝0.490 | n8＝1.92286 | v8＝20.9 |
| s14 | r14＝-12.657 | D14=is variable | ||
| s15 | R15=∞ (aperture) | d15＝0.589 | ||
| s16 | r16＝3.728 | d16＝0.693 | n9＝1.77310 | v9＝47.2 |
| s17 | r17＝-9.413 | d17＝0.078 | ||
| s18 | r18＝2.116 | d18＝1.747 | n10＝1.51680 | v10＝64.2 |
| s19 | r19＝-3.404 | d19＝0.157 | n11＝1.92286 | v11＝20.9 |
| s20 | r20＝2.019 | D20=is variable | ||
| s21 | r21＝1.829 | d21＝0.753 | n12＝1.58313 | v12＝59.5 |
| s22 | r22＝-4.055 | D22=is variable | ||
| s23 | R23=∞ (optical filter) | d23＝0.810 | nFL＝1.51680 | vFL＝64.2 |
| s24 | R24=∞ (optical filter) | D24=0.313 (back focus) |
Two surperficial s21, the s22 of the single convex lens G12 of the surperficial s16 of the convex lens G9 of the 3rd lens combination Gr3 and the 4th lens combination Gr4 form aspheric surface.Form 5 shows quadravalence, the 6th rank and the 8th rank asphericity coefficient A4, A6 and the A8 of above-mentioned each surperficial s16, s21 and s22.
| Asphericity coefficient | A4 | A6 | A8 |
| s16 | -0.4018×10 -2 | +0.6566×10 -3 | -0.9748×10 -4 |
| s21 | -0.3153×10 -1 | 0 | 0 |
| s22 | +0.2686×10 -1 | 0 | +0.2388×10 -2 |
In zoom lens 2, axially spaced-apart d9, d14, d20 and d22 change with zoom.Show in wide-angle side, middle burnt position and take the photograph focal length, f-number Fno, objective angle of image field (2 ω) and axially spaced-apart d9, d14, d20 and the d22 of far-end at form 6.
| Wide-angle side | In burnt position | Take the photograph far-end | |
| Focal length | 1.00 | 2.89 | 5.32 |
| Fno | 1.85 | 2.21 | 2.70 |
| Objective angle of image field (2 ω) | 78.4 | 26.4 | 14.12 |
| d9 | 0.176 | 1.969 | 2.745 |
| D14 | 2.899 | 1.107 | 0.330 |
| D20 | 0.840 | 0.350 | 0.841 |
| D22 | 0.634 | 1.124 | 0.634 |
Fig. 6 shows spherical aberration, distortion and the astigmatism of the zoom lens 2 among the above-mentioned numerical value embodiment to Fig. 8.In spherical aberration diagram, solid line is represented the value of e line; Dotted line is represented the value (wavelength is 435.8nm) of g line; Dot-and-dash line is represented the value (wavelength is 656.3nm) of C line.In astigmatism figure, solid line represents to vow shape shadow table area distortion value; Dotted line is represented warp-wise image plane distortion value.
Each conditional expression (1) that below shows the numerical value embodiment of above-mentioned zoom lens 2 arrives the value of (5), (9) and (10).
(1)h1-1/h1-4＝1.4461
(2)d1-2/d1-3＝0.178
(3)n1-2＝1.83500
(4)H1′/f1＝0.3488，f1＝3.705
(5)(n2-1+n2-2)/2＝1.88300
(8)h3-5/h3-1＝0.533
(9)f3/f3-1＝-0.843，f3＝2.981
Form 7
| Si | ri | di | ni | vi |
| s1 | r1＝-28.4470 | d1＝0.8 | n1＝1.88300 | v1＝40.8 |
| s2 | r2＝23.1427 | d2＝1.6311 | ||
| s3 | r3＝∞ | d3＝7.1580 | n2＝1.83481 | v2＝42.7 |
| S4 | r4＝-16.6167 | d4＝0.3103 | ||
| s5 | r5＝22.9139 | d5＝0.6 | n3＝1.84666 | v3＝23.8 |
| s6 | r6＝11.9511 | d6＝1.9324 | n4＝1.58913 | v4＝61.2 |
| s7 | r7＝35.9589 | d7＝0.1 | ||
| s8 | r8＝11.7395 | d8＝1.9198 | n5＝1.69350 | v5＝53.3 |
| s9 | r9＝79.5152 | D9=is variable | ||
| s10 | r10＝9.8681 | d10＝0.6 | n6＝1.88300 | v6＝40.8 |
| s11 | r11＝4.0479 | d11＝1.7056 | ||
| s12 | r12＝-4.6659 | d12＝0.6353 | n7＝1.77250 | v7＝49.6 |
| s13 | r13＝4.4788 | d13＝1.1190 | n8＝1.84666 | v8＝23.8 |
| s14 | r14＝741.4375 | D14=is variable | ||
| s15 | r15＝7.8454 | d 15＝1.3359 | n9＝1.58313 | v9＝59.5 |
| s16 | r16＝-78.4964 | d16＝1.0464 | ||
| s17 | R17=∞ (aperture) | D17=is variable | ||
| s18 | r18＝8.6702 | d18＝0.7772 | n10＝1.58313 | v10＝59.5 |
| s19 | r19＝∞ | d19＝0.55 | n11＝1.84666 | v11＝23.8 |
| s20 | r20＝6.1465 | d20＝1.6626 | n12＝1.69680 | v12＝55.5 |
| s21 | r21＝-7.7211 | D21=is variable | ||
| s22 | R22=∞ (optical filter) | d22＝0.81 | nFL＝1.51680 | vFL＝64.2 |
| s23 | R23=∞ (optical filter) | D23=0.3 (back focus) |
The object side surface s18 of the convex lens L10 of the object side surface s15 of the single convex lens L9 of the object side surface s8 of the convex lens L5 of the first lens combination Gr1, the 3rd lens combination Gr3 and the 4th lens combination Gr4 forms aspheric surface.Form 8 shows quadravalence, the 6th rank, the 8th rank and the tenth rank asphericity coefficient A4, A6, A8 and the A10 of above-mentioned each surperficial s8, s15 and s18.
| Asphericity coefficient | A4 | A6 | A8 | A10 |
| s8 | -0.54×10 -3 | 0.18×10 -6 | -0.62×10 -8 | 0.12×10 -9 |
| s15 | -0.33×10 -3 | -0.68×10 -4 | 0.86×10 -5 | -0.48×10 -6 |
| S18 | -0.15×10 -2 | 0.37×10 -4 | -0.82×10 -5 | 0.58×10 -6 |
In zoom lens 3, axially spaced-apart d9, d14, d17 and d21 change with zoom.Show in wide-angle side, middle burnt position and take the photograph focal length, f-number Fno, objective angle of image field (2 ω) and axially spaced-apart d9, d14, d17 and the d21 of far-end at form 9.
| Wide-angle side | In burnt position | Take the photograph far-end | |
| Focal length | 1.66 | 5.24 | 16.57 |
| Fno | 1.75 | 1.93 | 2.07 |
| Objective angle of image field (2 ω) | 76.2 | 24.2 | 7.7 |
| d9 | 0.6695 | 7.2471 | 11.3733 |
| D14 | 11.5083 | 4.9262 | 0.8 |
| D17 | 3.6681 | 1.9519 | 1.4864 |
| D21 | 4.8648 | 6.5809 | 7.0464 |
Figure 10 shows spherical aberration, distortion and the astigmatism of the zoom lens 3 among the above-mentioned numerical value embodiment to Figure 12.In spherical aberration diagram, solid line is represented the value of e line; Dotted line is represented the value (wavelength is 435.8nm) of g line; Dot-and-dash line is represented the value (wavelength is 656.3nm) of C line.In astigmatism figure, solid line represents to vow shape shadow table area distortion value; Dotted line is represented warp-wise image plane distortion value.
Each conditional expression (1) that below shows the numerical value embodiment of above-mentioned zoom lens 3 arrives the value of (5), (11) and (12).
(1)h1-1/h1-4＝1.400
(2)d1-2/d1-3＝0.228
(3)n1-2＝1.835
(4)H1′/f1＝0.265
(5)(n2-1+n2-2)/2＝1.828
(11)n4-2＝1.847
(12)f3/f4＝0.65
Form 10
| Si | ri | di | ni | vi |
| s1 | r1＝-134.7480 | d1＝0.9 | n1＝1.88300 | v1＝40.8 |
| s2 | r2＝14.0169 | d2＝2.8277 | ||
| s3 | r3＝∞ | d3＝7.2 | n2＝1.83481 | v2＝42.7 |
| S4 | r4＝-21.7936 | d4＝0.3 | ||
| s5 | r5＝31.7581 | d5＝0.9 | n3＝1.84666 | v3＝23.8 |
| s6 | r6＝12.3060 | d6＝2.85 | n4＝1.69680 | v4＝55.5 |
| s7 | r7＝35 | d7＝0.3 | ||
| s8 | r8＝14.4794 | d8＝2.4486 | n5＝1.80420 | v5＝46.5 |
| s9 | r9＝-153.0462 | D9=is variable | ||
| s10 | r10＝-72.8852 | d10＝0.7 | n6＝1.834 | v6＝37.3 |
| s11 | r11＝4.6392 | d11＝1.5177 | ||
| s12 | r12＝-6.4592 | d12＝0.4 | n7＝1.77250 | v7＝49.6 |
| s13 | r13＝4.3151 | d13＝1.4199 | n8＝1.84666 | v8＝23.8 |
| s14 | r14＝-36.2647 | D14=is variable | ||
| s15 | R15=∞ (aperture) | d15＝1.0326 | ||
| s16 | r16＝9.6975 | d16＝1.2318 | n9＝1.80610 | v9＝40.7 |
| s17 | r17＝-991.6604 | d17＝0.2855 | ||
| s18 | r18＝9.2949 | d18＝2.5216 | n10＝1.58144 | v10＝40.9 |
| s19 | r19＝-75.9863 | d19＝0.7988 | n11＝1.84666 | v11＝23.8 |
| s20 | r20＝7.4277 | D20=is variable | ||
| s21 | r21＝10.7553 | d21＝2.1939 | n12＝1.58913 | v12＝61.2 |
| s22 | r22＝-4.8461 | d22＝0.7 | n13＝1.80518 | v13＝25.5 |
| s23 | r23＝-7.8609 | D23=is variable | ||
| s24 | R24=∞ (color filter) | d24＝0.81 | nFL＝1.51680 | vFL＝64.2 |
| s25 | R23=∞ (color filter) | D25=0.3 (back focus) |
The object side surface s21 of the biconvex lens L12 of the image side surface s17 of the convex lens L9 of the 3rd lens combination Gr3 and the 4th lens combination Gr4 forms aspheric surface.Form 11 shows quadravalence, the 6th rank, the 8th rank and the tenth rank asphericity coefficient A4, A6, A8 and the A10 of each above-mentioned surperficial s17 and s21.
| Asphericity coefficient | A4 | A6 | A8 | A10 |
| s17 | 0.17×10 -3 | 0.44×10 -5 | -0.25×10 -6 | 0.51×10 -8 |
| s21 | -0.60×10 -3 | -0.29×10 -5 | 0.98×10 -6 | -0.48×10 -7 |
In zoom lens 4, axially spaced-apart d9, d14, d20 and d23 change with zoom.Show in wide-angle side, middle burnt position and take the photograph focal length, f-number Fno, objective angle of image field (2 ω) and axially spaced-apart d9, d14, d20 and the d23 of far-end at form 12.
Form 12
| Wide-angle side | In burnt position | Take the photograph far-end | |
| Focal length | 2.31 | 7.23 | 22.61 |
| Fno | 1.78 | 2.14 | 2.86 |
| Objective angle of image field (2 ω) | 78.0 | 25.0 | 8.4 |
| d9 | 0.8719 | 7.3280 | 11.4029 |
| D14 | 11.8310 | 5.3749 | 1.3 |
| D20 | 5.5386 | 2.3561 | 1.2019 |
| D23 | 7.5197 | 10.7022 | 11.8565 |
Figure 14 shows spherical aberration, distortion and the astigmatism of the zoom lens 4 among the above-mentioned numerical value embodiment to Figure 16.In spherical aberration diagram, solid line is represented the value of e line; Dotted line is represented the value (wavelength is 435.8nm) of g line; Dot-and-dash line is represented the value (wavelength is 656.3nm) of C line.In astigmatism figure, solid line represents to vow shape shadow table area distortion value; Dotted line is represented warp-wise image plane distortion value.
Each conditional expression (1) that below shows the above-mentioned numerical value embodiment of zoom lens 4 arrives the value of (5), (9), (11) and (13).
(1)h1-1/h1-4＝1.400
(2)d1-2/d1-3＝0.393
(3)n1-2＝1.835
(4)H1′/f1＝0.277
(5)(n2-1+n2-2)/2＝1.803
(9)h3-5/h3-1＝0.771
(11)n4-2＝1.805
(13)f3/f3-1＝1.261
Only utilize the example apply the present invention to implementing actual time to show all shapes and numerical value in the various piece shown in the above preferred embodiment, should with these limitations not be interpreted as technical scope of the present invention.
As according to above description finding, the present invention's (1) zoom lens is by first lens combination with positive refracting power, second lens combination with negative refracting power, the 3rd lens combination with positive refracting power is formed with the 4th lens combination with positive refracting power, these lens combination are from the object side arranged in sequence, wherein, first lens combination and the 3rd lens combination are fixed, zoom lens mainly changes enlargement factor by the position of moving second lens combination along optical axis direction, come image position change is proofreaied and correct and focused on by move the 4th lens combination along optical axis direction, it is characterized in that first lens combination is made up of five lens: concavees lens; Convex lens with very strong convexity towards the image side; By concavees lens with very strong concavity towards the image side and the cemented lens that convex lens constitute; And the convex lens with very strong convexity towards object side, these lens are from the object side arranged in sequence, and are configured to the expression formula that meets the following conditions: (1) 1.25＜h1-1/h1-4＜1.55; (2) d1-2/d1-3＜0.4; (3) 1.65＜n1-2; And (4) 0.1＜H1 '/f1＜0.6, in the formula, f1 is the focal length of first lens combination; H1-i is for when allowing the paraxial rays parallel with optical axis to enter first lens combination, at the height of the paraxial rays in i surface of object side; D1-i is in first lens combination, from the axial spacing on i surface to the (i+1) surface; N1-i is in first lens combination, the d line refractive index of i lens; And H1 ' is the interval ("-" expression object side, "+" expression image side) of the image side principal point of summit in first lens combination of the face of the most close image side from first lens combination.
Therefore, zoom lens of the present invention can be proofreaied and correct various aberrations, and can take into account the exhibition wide-angle and reduce the front lens diameter.For example, at aspect of performance, zoom ratio is about ten times, and the visual angle of wide-angle side surpasses 76 degree, and the f-number of wide-angle side is about F1.7 to F1.8, and it can realize subminiaturization, that is, the diameter of front lens is about five to seven times of Diagonal Dimension.
In the present invention (2), second lens combination comprises three lens: the recessed meniscus lens with very strong concavity towards the image side; And the cemented lens that constitutes by biconcave lens and convex lens, these lens are from object one side arranged in sequence, and expression formula (5) is configured to satisfy condition: (5) 1.8＜(n2-1+n2-2)/2, and in the formula: n2-1 is the d line refractive index of the recessed meniscus lens of second lens combination; And n2-2 is the d line refractive index of the biconcave lens of second lens combination.Therefore, by preventing Pei Ciwaer and too small, can optimize Pei Ciwaer and, and help the curvature of field is proofreaied and correct, therefore can access exquisite image.
In the present invention (3) and (4), the 3rd lens combination is made up of single convex lens, and at least one surface is an aspheric surface.The 4th lens combination comprises that the surface of its image side is an aspheric surface by recessed meniscus lens with very strong concavity towards the image side and the cemented lens that biconvex lens constitutes, and these lens are from object one side arranged in sequence.These lens are configured to satisfy following each conditional expression: (6)-0.4＜f3/r3-2＜0.4; (7)-1.25＜r4-1/r4-3＜-0.8; And (8) 0.3＜r4-2/f4＜0.6, in the formula: f3 is the focal length of the 3rd lens combination; F4 is the focal length of the 4th lens combination; R3-2 is the radius-of-curvature of the image side surface of the convex lens in the 3rd lens combination; R4-1 is the radius-of-curvature of the object side surface of the recessed meniscus lens in the 4th lens combination; R4-2 is the radius-of-curvature of the adhesive surface in the 4th lens combination; And r4-3 is the radius-of-curvature of the image side surface of the convex lens in the 4th lens combination.Therefore, can be poor to intelligent image evenly, spherical aberration and the curvature of field suitably proofread and correct, in addition, susceptibility can be reduced, thereby stay-in-grade batch process can be carried out off-centre between each lens that influence picture quality and the off-centre between the lens combination.
In the present invention (5) and (6), the 3rd lens combination comprises convex lens and by the convex lens with very strong convexity towards object side with have the cemented lens that the concavees lens of very strong concavity towards object side constitute, these lens are from the object side arranged in sequence, and at least one surface is an aspheric surface.The 4th lens combination is made up of single convex lens, and at least one surface is an aspheric surface.These lens combination satisfy following each conditional expression: (9) 0.4＜h3-5/h3-1＜0.7; And (10) 0.75＜f3/f3-1＜1, in the formula: h3-i is for when when the wide-angle side permission paraxial rays parallel with optical axis enters first lens combination, at the height of the paraxial rays in i face of object side of the 3rd lens combination; F3 is the focal length of the 3rd lens combination; And f3-1 is the focal length of the single convex lens of the 3rd lens combination.Therefore, can when suitably being proofreaied and correct, various aberrations shorten total length, and favourable to miniaturization thus.
In the present invention (7) and (8), the 3rd lens combination is made up of single convex lens, and at least one surface is an aspheric surface.The 4th lens combination comprises the cemented lens that is made of convex lens, concavees lens and convex lens with very strong convexity towards object side, and these lens are from the object side arranged in sequence.In addition, the surface of close object side is an aspheric surface at least.These lens combination are configured to satisfy following each conditional expression: (11) n4-2＞1.8; And (12) 0.1＜f3/f4＜0.7, in the formula: n4-2 is the d line refractive index of the concavees lens of the 4th lens combination; F3 is the focal length of the 3rd lens combination; F4 is the focal length of the 4th lens combination.Therefore, by the refraction that caused by the color relevant with aberration and spherical aberration change is suppressed, and, can proofread and correct the curvature of field effectively by to towards the Pei Ciwaer of positive side with proofread and correct, wherein, aberration and spherical aberration are to be caused by the mobile of the 4th lens combination.In addition, can under the situation that does not reduce performance, when suppressing the spherical aberration change, the total system of zoom lens be minimized.In addition, can reduce the performance that the fabrication tolerance by the 4th lens combination causes descends.
In the present invention (9) and (10), the 3rd lens combination comprises convex lens and by the convex lens with very strong convexity towards object side with have the cemented lens that the concavees lens of very strong concavity towards the image side constitute, these lens are from the object side arranged in sequence, and at least one surface is an aspheric surface.The 4th lens combination comprises by biconvex lens and has the cemented lens that the convex lens of very strong convexity towards the image side constitute, and at least one surface is an aspheric surface.These lens combination are configured to satisfy following each conditional expression: (9) 0.4＜h3-5/h3-1＜0.7; (11) n4-2＞1.8; And (13) 0.75＜f3/f3-1＜1.3, in the formula: h3-i is for when when the wide-angle side permission paraxial rays parallel with optical axis enters the first lens combination Gr1, at the height of the paraxial rays in i face of object side of the 3rd lens combination Gr3; F3 is the focal length of the 3rd lens combination Gr3; F3-1 be the 3rd lens combination Gr3 the focal length of single convex lens; And n4-2 is the d line refractive index of the concavees lens of the 4th lens combination.Therefore, can when suitably being proofreaied and correct, various aberrations realize miniaturization thereby shorten total length.
The present invention's (11) image pick up equipment comprises: zoom lens; Image pick-up device, the image transitions that is used for being caught by zoom lens is an electrical picture signal; And image control apparatus.Image control apparatus is configured to form new picture signal and export new picture signal through coordinate transform, wherein, coordinate transform is in reference to the coordinate transforming coefficient that provides in advance according to the variable enlargement factor through zoom lens, will be shifted by the point on the defined image of the picture signal that image pick-up device forms.Zoom lens is made up of first lens combination with positive refracting power, second lens combination with negative refracting power, the 4th lens combination that has the 3rd lens combination of positive refracting power and have a positive refracting power, and these lens combination are from the object side arranged in sequence.First lens combination and the 3rd lens combination are fixed, and zoom lens mainly changes enlargement factor by the position of moving second lens combination along optical axis direction, come image position change is proofreaied and correct and focused on by move the 4th lens combination along optical axis direction.First lens combination is made up of five lens: concavees lens; Convex lens with very strong convexity towards the image side; By concavees lens with very strong concavity towards the image side and the cemented lens that convex lens constitute; And the convex lens with very strong convexity towards object side, these lens are from the object side arranged in sequence.It is characterized in that these lens are configured to satisfy following each conditional expression: (1) 1.25＜h1-1/h1-4＜1.55; (2) d1-2/d1-3＜0.4; (3) 1.65＜n1-2; And (4) 0.1＜H1 '/f1＜0.6, in the formula: f1 is the focal length of first lens combination; H1-i is for when allowing the paraxial rays parallel with optical axis to enter first lens combination, at the height of the paraxial rays in i surface of object side; D1-i is in first lens combination, from the axial spacing on i surface to the (i+1) surface; N1-i is in first lens combination, the d line refractive index of i lens; And H1 ' is the interval ("-" expression object side, "+" expression image side) of the image side principal point of concavees lens in first lens combination of the face of the most close image side from first lens combination.
Therefore, in the image pick up equipment of the present invention (11), by causing barrel distortion in wide-angle side on one's own initiative and to a great extent, cause pincushion distortion taking the photograph far-end, variation for paraxial focal length, visual angle change after the distortion correction is enough big, can realize miniaturization reaching under the situation of required zoom ratio thus.
In the present invention (12), utilize the present invention's (2) zoom lens can prevent Pei Ciwaer and too small, and help the curvature of field is proofreaied and correct.
In the present invention (13) and (14), utilize the zoom lens of the present invention (3) and (4), can be poor to intelligent image evenly, spherical aberration and the curvature of field suitably proofread and correct, in addition, susceptibility can be reduced, thereby stay-in-grade batch process can be carried out off-centre between each lens that influence picture quality and the off-centre between the lens combination.
In the present invention (15) and (16), utilize the zoom lens of the present invention (5) and (6), can when suitably being proofreaied and correct, various aberrations shorten total length, to help miniaturization.
In the present invention (17) and (18), utilize the zoom lens of the present invention (7) and (8) can suppress the refraction change that causes by the color relevant with aberration and spherical aberration, wherein, aberration and spherical aberration are to be caused by the mobile of the 4th lens combination.By proofread and correct towards positive side Pei Ciwaer and, can effectively proofread and correct the curvature of field, and, can under the situation that does not reduce performance, make the total system miniaturization of zoom lens.In addition, can reduce because the performance that the fabrication tolerance of the 4th lens combination causes descends.
In the present invention (19) and (20), utilize the zoom lens of the present invention (9) and (10), can when suitably being proofreaied and correct, various aberrations realize miniaturization thereby shorten total length.
Claims (20)
1. zoom lens, comprise first lens combination, second lens combination, have the 3rd lens combination of positive refracting power and have the 4th lens combination of positive refracting power with negative refracting power with positive refracting power, these lens combination are from the object side arranged in sequence, wherein, first lens combination and the 3rd lens combination are fixed, zoom lens mainly changes enlargement factor by move second lens combination along optical axis direction, come image position change is proofreaied and correct and focused on by move the 4th lens combination along optical axis direction, it is characterized in that:
Described first lens combination comprises five lens: concavees lens; Convex lens with very strong convexity towards the image side; By concavees lens with very strong concavity towards the image side and the cemented lens that convex lens constitute; And the convex lens with very strong convexity towards object side, these lens are from the object side arranged in sequence, and described first lens combination be configured to meet the following conditions each expression formula in the expression formula:
(1)1.25＜h1-1/h1-4＜1.55；
(2)d1-2/d1-3＜0.4；
(3) 1.65＜n1-2; And
(4)0.1＜H1′/f1＜0.6，
In the formula:
F1 is the focal length of first lens combination;
H1-i is for when allowing the paraxial rays parallel with optical axis to enter first lens combination, at the height of the paraxial rays in i surface of object side;
D1-i is in first lens combination, from the axial spacing on i surface to the (i+1) surface;
N1-i is in first lens combination, the d line refractive index of i lens; And
H1 ' is the interval ("-" expression object side, "+" expression image side) of the image side principal point of summit in first lens combination of the face of the most close image side from first lens combination.
2. zoom lens as claimed in claim 1,
It is characterized in that second lens combination comprises three lens: recessed meniscus lens with very strong concavity towards the image side; Biconcave lens; And convex lens, these lens are from the object side arranged in sequence, and
Expression formula (5) is characterized in that meeting the following conditions:
(5)1.8＜(n2-1+n2-2)/2，
In the formula:
N2-1 is the d line refractive index of the recessed meniscus lens of second lens combination; And
N2-2 is the d line refractive index of the biconcave lens of second lens combination.
3. zoom lens as claimed in claim 1 is characterized in that:
The 3rd lens combination is made up of single convex lens, and at least one surface is an aspheric surface; And
The 4th lens combination comprises the cemented lens that constitutes towards the recessed meniscus lens of the concavity of image side and biconvex lens that the image side surface is aspheric surface by having, and these lens are from the object side arranged in sequence, and
Each expression formula in expression formula (6), (7) and (8) is characterized in that meeting the following conditions:
(6)-0.4＜f3/r3-2＜0.4；
(7)-1.25＜r4-1/r4-3＜-0.8; And
(8)0.3＜r4-2/f4＜0.6，
In the formula:
F3 is the focal length of the 3rd lens combination;
F4 is the focal length of the 4th lens combination;
R3-2 is the radius-of-curvature of the image side surface of the convex lens in the 3rd lens combination;
R4-1 is the radius-of-curvature of the object side surface of the recessed meniscus lens in the 4th lens combination;
R4-2 is the radius-of-curvature of the adhesive surface in the 4th lens combination; And
R4-3 is the radius-of-curvature of the image side surface of the convex lens in the 4th lens combination.
4. zoom lens as claimed in claim 2,
It is characterized in that:
The 3rd lens combination is made up of single convex lens, and at least one surface is an aspheric surface; And
The 4th lens combination comprises the cemented lens that constitutes towards the recessed meniscus lens of the concavity of image side and biconvex lens that the image side surface is aspheric surface by having, and these lens are from the object side arranged in sequence, and
Each expression formula in expression formula (6), (7) and (8) is characterized in that meeting the following conditions:
(6)-0.4＜f3/r3-2＜0.4；
(7)-1.25＜r4-1/r4-3＜-0.8; And
(8)0.3＜r4-2/f4＜0.6，
In the formula:
F3 is the focal length of the 3rd lens combination;
F4 is the focal length of the 4th lens combination;
R3-2 is the radius-of-curvature of the image side surface of the convex lens in the 3rd lens combination;
R4-1 is the radius-of-curvature of the object side surface of the recessed meniscus lens in the 4th lens combination;
R4-2 is the radius-of-curvature of the adhesive surface in the 4th lens combination; And
R4-3 is the radius-of-curvature of the image side surface of the convex lens in the 4th lens combination.
5. zoom lens as claimed in claim 1,
It is characterized in that:
The 3rd lens combination comprises convex lens and by the convex lens with very strong convexity towards object side with have the cemented lens that the concavees lens of very strong concavity towards the image side constitute, these lens are from the object side arranged in sequence, and at least one surface is an aspheric surface; And
The 4th lens combination is made up of single convex lens, and at least one surface is aspheric surface, and
Each expression formula in expression formula (9) and (10) is characterized in that meeting the following conditions:
(9) 0.4＜h3-5/h3-1＜0.7; And
(10)0.75＜f3/f3-1＜1，
In the formula:
H3-i is for when when the wide-angle side permission paraxial rays parallel with optical axis enters first lens combination, at the height of the paraxial rays in i surface of object side of the 3rd lens combination;
F3 is the focal length of the 3rd lens combination; And
F3-1 is the focal length of the single convex lens of the 3rd lens combination.
6. zoom lens as claimed in claim 2,
It is characterized in that:
The 3rd lens combination comprises convex lens and by the convex lens with very strong convexity towards object side with have the cemented lens that the concavees lens of very strong concavity towards the image side constitute, these lens are from the object side arranged in sequence, and at least one surface is an aspheric surface; And
The 4th lens combination is made up of single convex lens, and at least one surface is aspheric surface, and
Each expression formula in expression formula (9) and (10) is characterized in that meeting the following conditions:
(9) 0.4＜h3-5/h3-1＜0.7; And
(10)0.75＜f3/f3-1＜1，
In the formula:
H3-i is for when when the wide-angle side permission paraxial rays parallel with optical axis enters first lens combination, at the height of the paraxial rays in i surface of object side of the 3rd lens combination;
F3 is the focal length of the 3rd lens combination; And
F3-1 is the focal length of the single convex lens of the 3rd lens combination.
7. zoom lens as claimed in claim 1,
It is characterized in that:
The 3rd lens combination is made up of single convex lens, and at least one surface is an aspheric surface; And
The 4th lens combination comprises the cemented lens that constitutes towards convex lens, concavees lens and the convex lens of the convexity of object side by having, and these lens are from the object side arranged in sequence, and the surface of close object side is an aspheric surface at least,
Each expression formula in expression formula (11) and (12) is characterized in that meeting the following conditions:
(11) n4-2＞1.8; And
(12)0.1＜f3/f4＜0.7，
In the formula:
N4-2 is the d line refractive index of the concavees lens of the 4th lens combination;
F3 is the focal length of the 3rd lens combination; And
F4 is the focal length of the 4th lens combination.
8. zoom lens as claimed in claim 2,
It is characterized in that:
The 3rd lens combination is made up of single convex lens, and at least one surface is an aspheric surface; And
The 4th lens combination comprises the cemented lens that constitutes towards convex lens, concavees lens and the convex lens of the convexity of object side by having, and these lens are from the object side arranged in sequence, and the surface of close object side is an aspheric surface at least, and
Each expression formula in expression formula (11) and (12) is characterized in that meeting the following conditions:
(11) n4-2＞1.8; And
(12)0.1＜f3/f4＜0.7，
In the formula:
N4-2 is the d line refractive index of the concavees lens of the 4th lens combination;
F3 is the focal length of the 3rd lens combination; And
F4 is the focal length of the 4th lens combination.
9. zoom lens as claimed in claim 1,
It is characterized in that:
The 3rd lens combination comprises convex lens and by the convex lens with very strong convexity towards object side with have the cemented lens that the concavees lens of very strong concavity towards the image side constitute, these lens are from the object side arranged in sequence, and at least one surface is an aspheric surface; And
The 4th lens combination comprises by biconvex lens and has the cemented lens that constitutes towards the concavees lens of the convexity of image side, and at least one surface is aspheric surface, and
Each expression formula in expression formula (9), (11) and (13) is characterized in that meeting the following conditions:
(9)0.4＜h3-5/h3-1＜0.7；
(11) n4-2＞1.8; And
(13)0.75＜f3/f3-1＜1.3，
In the formula:
H3-i is for when when the wide-angle side permission paraxial rays parallel with optical axis enters first lens combination, at the height of the paraxial rays in i surface of object side of the 3rd lens combination;
F3 is the focal length of the 3rd lens combination;
F3-1 is the focal length of the single convex lens of the 3rd lens combination; And
N4-2 is the d line refractive index of the concavees lens of the 4th lens combination.
10. zoom lens as claimed in claim 2,
It is characterized in that:
The 3rd lens combination comprises convex lens and by the convex lens with very strong convexity towards object side with have the cemented lens that the concavees lens of very strong concavity towards the image side constitute, these lens are from the object side arranged in sequence, and at least one surface is an aspheric surface; And
The 4th lens combination comprises by biconvex lens and has the cemented lens that constitutes towards the concavees lens of the convexity of image side, and at least one surface is aspheric surface, and
Each expression formula in expression formula (9), (11) and (13) is characterized in that meeting the following conditions:
(9)0.4＜h3-5/h3-1＜0.7；
(11) n4-2＞1.8; And
(13)0.75＜f3/f3-1＜1.3，
In the formula:
H3-i is for when when the wide-angle side permission paraxial rays parallel with optical axis enters first lens combination, at the height of the paraxial rays in i surface of object side of the 3rd lens combination;
F3 is the focal length of the 3rd lens combination;
F3-1 is the focal length of the single convex lens of the 3rd lens combination; And
N4-2 is the d line refractive index of the concavees lens of the 4th lens combination.
11. an image pick up equipment comprises: zoom lens; Image pick-up device, the image transitions that is used for being caught by zoom lens is an electrical picture signal; And image control apparatus, it is characterized in that:
Described image control apparatus is configured to form new picture signal and export this new picture signal through coordinate transform, wherein, coordinate transform is the coordinate transforming coefficient that provides in advance with reference to according to the variable magnification through described zoom lens, will be shifted by the point on the defined image of the picture signal that described image pick-up device forms;
Described zoom lens is made up of first lens combination with positive refracting power, second lens combination with negative refracting power, the 4th lens combination that has the 3rd lens combination of positive refracting power and have a positive refracting power, these lens combination are from the object side arranged in sequence, wherein, first lens combination and the 3rd lens combination are fixed, zoom lens mainly changes enlargement factor by move second lens combination along optical axis direction, and comes image position change is proofreaied and correct and focused on by move the 4th lens combination along optical axis direction; And
Described first lens combination is made up of five lens: concavees lens; Convex lens with very strong convexity towards the image side; By concavees lens with very strong concavity towards the image side and the cemented lens that convex lens constitute; And the convex lens with very strong convexity towards object side, these lens are from the object side arranged in sequence, each expression formula in the expression formula that it is characterized in that meeting the following conditions:
(1)1.25＜h1-1/h1-4＜1.55；
(2)d1-2/d1-3＜0.4；
(3) 1.65＜n1-2; And
(4)0.1＜H1′/f1＜0.6，
In the formula:
F1 is the focal length of first lens combination;
H1-i is for when allowing the paraxial rays parallel with optical axis to enter first lens combination, at the height of the paraxial rays in i surface of object side;
D1-i is in first lens combination, from the axial spacing on i surface to the (i+1) surface;
N1-i is in first lens combination, the d line refractive index of i lens; And
H1 ' is the interval ("-" expression object side, "+" expression image side) of the image side principal point of summit in first lens combination of the face of the most close image side from first lens combination.
12. image pick up equipment as claimed in claim 11 is characterized in that:
Second lens combination of described zoom lens is made up of three lens: the recessed meniscus lens with very strong concavity towards the image side; Biconcave lens; And convex lens, these lens are from the object side arranged in sequence, and the conditional expression (5) below satisfying:
(5)1.8＜(n2-1+n2-2)/2，
In the formula:
N2-1 is the d line refractive index of the recessed meniscus lens of second lens combination; And
N2-2 is the d line refractive index of the biconcave lens of second lens combination.
13. image pick up equipment as claimed in claim 11,
It is characterized in that:
The 3rd lens combination of described zoom lens is made up of single convex lens, and at least one surface is an aspheric surface; And
The 4th lens combination of described zoom lens comprises that by having towards the surface of the recessed meniscus lens of the concavity of image side and image side be the cemented lens that the biconvex lens of aspheric surface constitutes, and these lens are from the object side arranged in sequence, and
It is characterized in that satisfying following each conditional expression (6), (7) and (8):
(6)-0.4＜f3/r3-2＜0.4；
(7)-1.25＜r4-1/r4-3＜-0.8; And
(8)0.3＜r4-2/f4＜0.6，
In the formula:
F3 is the focal length of the 3rd lens combination;
F4 is the focal length of the 4th lens combination;
R3-2 is the radius-of-curvature of the image side surface of the convex lens in the 3rd lens combination;
R4-1 is the radius-of-curvature of the object side surface of the recessed meniscus lens in the 4th lens combination;
R4-2 is the radius-of-curvature of the adhesive surface in the 4th lens combination; And
R4-3 is the radius-of-curvature of the image side surface of the convex lens in the 4th lens combination.
14. image pick up equipment as claimed in claim 12,
It is characterized in that:
The 3rd lens combination of described zoom lens is made up of single convex lens, and at least one surface is an aspheric surface; And
The 4th lens combination of described zoom lens comprises that by having towards the surface of the recessed meniscus lens of the concavity of image side and image side be the cemented lens that the biconvex lens of aspheric surface constitutes, and these lens are from the object side arranged in sequence, and
It is characterized in that satisfying following each conditional expression (6), (7) and (8):
(6)-0.4＜f3/r3-2＜0.4；
(7)-1.25＜r4-1/r4-3＜-0.8; And
(8)0.3＜r4-2/f4＜0.6，
In the formula:
F3 is the focal length of the 3rd lens combination;
F4 is the focal length of the 4th lens combination;
R3-2 is the radius-of-curvature of the image side surface of the convex lens in the 3rd lens combination;
R4-1 is the radius-of-curvature of the object side surface of the recessed meniscus lens in the 4th lens combination;
R4-2 is the radius-of-curvature of the adhesive surface in the 4th lens combination; And
R4-3 is the radius-of-curvature of the image side surface of the convex lens in the 4th lens combination.
15. image pick up equipment as claimed in claim 11,
It is characterized in that:
The 3rd lens combination of described zoom lens comprises convex lens and by the convex lens with very strong convexity towards object side with have the cemented lens that the concavees lens of very strong concavity towards object side constitute, these lens are from the object side arranged in sequence, and at least one surface is an aspheric surface; And
The 4th lens combination of described zoom lens is made up of single convex lens, and at least one surface is aspheric surface, and
Each expression formula in expression formula (9) and (10) is characterized in that meeting the following conditions:
(9) 0.4＜h3-5/h3-1＜0.7; And
(10)0.75＜f3/f3-1＜1，
In the formula:
H3-i is for when when the wide-angle side permission paraxial rays parallel with optical axis enters first lens combination, at the height of the paraxial rays in i surface of object side of the 3rd lens combination;
F3 is the focal length of the 3rd lens combination; And
F3-1 is the focal length of the single convex lens of the 3rd lens combination.
16. image pick up equipment as claimed in claim 12,
It is characterized in that:
The 3rd lens combination of described zoom lens comprises convex lens and by the convex lens with very strong convexity towards object side with have the cemented lens that the concavees lens of very strong concavity towards the image side constitute, these lens are from the object side arranged in sequence, and at least one surface is an aspheric surface; And
The 4th lens combination of described zoom lens is made up of single convex lens, and at least one surface is aspheric surface, and
Each expression formula in expression formula (9) and (10) is characterized in that meeting the following conditions:
(9) 0.4＜h3-5/h3-1＜0.7; And
(10)0.75＜f3/f3-1＜1，
In the formula:
H3-i is for when when the wide-angle side permission paraxial rays parallel with optical axis enters first lens combination, at the height of the paraxial rays in i surface of object side of the 3rd lens combination;
F3 is the focal length of the 3rd lens combination; And
F3-1 is the focal length of the single convex lens of the 3rd lens combination.
17. image pick up equipment as claimed in claim 11,
It is characterized in that:
The 3rd lens combination of described zoom lens is made up of single convex lens, and at least one surface is an aspheric surface; And
The 4th lens combination of described zoom lens comprises the cemented lens that constitutes towards convex lens, concavees lens and the convex lens of the convexity of object side by having, and these lens are from the object side arranged in sequence, and the surface of close object side is an aspheric surface at least,
Each expression formula in expression formula (11) and (12) is characterized in that meeting the following conditions:
(11) n4-2＞1.8; And
(12)0.1＜f3/f4＜0.7，
In the formula:
N4-2 is the d line refractive index of the concavees lens of the 4th lens combination;
F3 is the focal length of the 3rd lens combination; And
F4 is the focal length of the 4th lens combination.
18. image pick up equipment as claimed in claim 12,
It is characterized in that:
The 3rd lens combination of described zoom lens is made up of single convex lens, and at least one surface is an aspheric surface; And
The 4th lens combination of described zoom lens comprises the cemented lens that constitutes towards convex lens, concavees lens and the convex lens of the convexity of object side by having, and these lens are from the object side arranged in sequence, and the surface of close object side is an aspheric surface at least,
Each expression formula in expression formula (11) and (12) is characterized in that meeting the following conditions:
(11) n4-2＞1.8; And
(12)0.1＜f3/f4＜0.7，
In the formula:
N4-2 is the d line refractive index of the concavees lens of the 4th lens combination;
F3 is the focal length of the 3rd lens combination; And
F4 is the focal length of the 4th lens combination.
19. image pick up equipment as claimed in claim 11,
It is characterized in that:
The 3rd lens combination of described zoom lens comprises convex lens and by the convex lens with very strong convexity towards object side with have the cemented lens that the concavees lens of very strong concavity towards the image side constitute, these lens are from the object side arranged in sequence, and at least one surface is an aspheric surface; And
The 4th lens combination of described zoom lens comprises by biconvex lens and has the cemented lens that constitutes towards the concavees lens of the convexity of image side, and at least one surface is aspheric surface, and
Each expression formula in expression formula (9), (11) and (13) is characterized in that meeting the following conditions:
(9)0.4＜h3-5/h3-1＜0.7；
(11) n4-2＞1.8; And
(13)0.75＜f3/f3-1＜1.3，
In the formula:
H3-i is for when when the wide-angle side permission paraxial rays parallel with optical axis enters first lens combination, at the height of the paraxial rays in i surface of object side of the 3rd lens combination;
F3 is the focal length of the 3rd lens combination;
F3-1 be the 3rd lens combination the focal length of single convex lens; And
N4-2 is the d line refractive index of the concavees lens of the 4th lens combination.
20. image pick up equipment as claimed in claim 12,
It is characterized in that:
The 3rd lens combination of described zoom lens comprises convex lens and by the convex lens with very strong convexity towards object side with have the cemented lens that the concavees lens of very strong concavity towards the image side constitute, these lens are from the object side arranged in sequence, and at least one surface is an aspheric surface; And
The 4th lens combination of described zoom lens comprises by biconvex lens and has the cemented lens that constitutes towards the concavees lens of the convexity of image side, and at least one surface is aspheric surface, and
Each expression formula in expression formula (9), (11) and (13) is characterized in that meeting the following conditions:
(9)0.4＜h3-5/h3-1＜0.7；
(11) n4-2＞1.8; And
(13)0.75＜f3/f3-1＜1.3，
In the formula:
H3-i is for when when the wide-angle side permission paraxial rays parallel with optical axis enters first lens combination, at the height of the paraxial rays in i surface of object side of the 3rd lens combination;
F3 is the focal length of the 3rd lens combination;
F3-1 is the focal length of the single convex lens of the 3rd lens combination; And
N4-2 is the d line refractive index of the concavees lens of the 4th lens combination.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003009719 | 2003-01-17 | ||
| JP9719/2003 | 2003-01-17 | ||
| JP160877/2003 | 2003-06-05 |
Publications (2)
| Publication Number | Publication Date |
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| CN1739052A true CN1739052A (en) | 2006-02-22 |
| CN100368857C CN100368857C (en) | 2008-02-13 |
Family
ID=36081245
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2003801088467A Expired - Fee Related CN100368857C (en) | 2003-01-17 | 2003-12-12 | Zoom lens and image pickup apparatus |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100368857C (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7468845B2 (en) | 2006-01-25 | 2008-12-23 | Young Optics Inc. | Zoom lens |
| CN100465688C (en) * | 2006-04-05 | 2009-03-04 | 扬明光学股份有限公司 | Zoom lens |
| CN101206303B (en) * | 2006-12-15 | 2010-06-02 | 卡西欧计算机株式会社 | Lens system and projector using the same |
| CN101794011B (en) * | 2009-02-04 | 2011-11-16 | 索尼公司 | Variable focal length lens system and imaging apparatus |
| CN101634740B (en) * | 2008-07-23 | 2012-02-29 | 索尼株式会社 | Image pickup lens and image pickup apparatus |
| CN105785555A (en) * | 2016-03-28 | 2016-07-20 | 中山联合光电科技股份有限公司 | Optical system of large image surface, high magnification and high resolution |
| CN110709748A (en) * | 2017-06-08 | 2020-01-17 | 柯尼卡美能达株式会社 | Zoom lens and imaging device |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH071337B2 (en) * | 1985-09-26 | 1995-01-11 | 旭光学工業株式会社 | High magnification zoom lens for finite distance |
| JPH09243909A (en) * | 1996-03-05 | 1997-09-19 | Sony Corp | Camera shake correction optical system |
| JP2000028922A (en) * | 1999-07-06 | 2000-01-28 | Canon Inc | Zoom lens |
| US6449101B1 (en) * | 2000-11-08 | 2002-09-10 | Acer Communications And Multimedia Inc. | Projection zoom lens with a long back focal length and exit pupil position |
-
2003
- 2003-12-12 CN CNB2003801088467A patent/CN100368857C/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7468845B2 (en) | 2006-01-25 | 2008-12-23 | Young Optics Inc. | Zoom lens |
| CN100465688C (en) * | 2006-04-05 | 2009-03-04 | 扬明光学股份有限公司 | Zoom lens |
| CN101206303B (en) * | 2006-12-15 | 2010-06-02 | 卡西欧计算机株式会社 | Lens system and projector using the same |
| CN101634740B (en) * | 2008-07-23 | 2012-02-29 | 索尼株式会社 | Image pickup lens and image pickup apparatus |
| CN101794011B (en) * | 2009-02-04 | 2011-11-16 | 索尼公司 | Variable focal length lens system and imaging apparatus |
| CN105785555A (en) * | 2016-03-28 | 2016-07-20 | 中山联合光电科技股份有限公司 | Optical system of large image surface, high magnification and high resolution |
| 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 |
| CN110709748A (en) * | 2017-06-08 | 2020-01-17 | 柯尼卡美能达株式会社 | Zoom lens and imaging device |
| CN110709748B (en) * | 2017-06-08 | 2021-11-05 | 柯尼卡美能达株式会社 | Zoom lens and imaging device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100368857C (en) | 2008-02-13 |
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