CN104076497A - Zoom lens and digital camera - Google Patents
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- CN104076497A CN104076497A CN201310106796.4A CN201310106796A CN104076497A CN 104076497 A CN104076497 A CN 104076497A CN 201310106796 A CN201310106796 A CN 201310106796A CN 104076497 A CN104076497 A CN 104076497A
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Abstract
The invention relates to the technical field of imaging, in particular to a zoom lens and a digital camera. The zoom lens is used for improving the depth of a field of the zoom lens, and therefore a target scene, a target close shot, a target long shot and a sharply focused image can be obtained. The zoom lens comprises a zoom set and a focusing set which are sequentially arranged from the object side to the image side, wherein the zoom set comprises a first convex and concave lens, a first biconcave lens and a first convex lens which are sequentially arranged from the object side to the image side; the convex face of the first convex and concave lens faces the object side, and the focal power of the first convex and concave lens is negative; the focal power of the first biconcave lens is negative; the convex face of the first convex lens faces the object side, and the focal power of the first convex lens is positive; the focusing set comprises a first biconvex lens, a second convex lens, a second biconcave lens, a second biconvex lens and a third biconvex lens, all of which are sequentially arranged from the object side to the image side; the focal power of the first biconvex lens is positive; the convex face of the second convex lens faces the object side, and the focal power of the second convex lens is negative; the focal power of the second biconcave lens is positive; the focal power of the second biconvex lens is positive; the focal power of the third biconvex lens is positive. The invention further discloses the digital camera comprising the zoom lens with the characteristics.
Description
Technical field
The present invention relates to technical field of imaging, particularly a kind of zoom lens and digital camera.
Background technology
Zoom lens refers to and can convert within the specific limits focal length, thereby obtain the camera lens of different big or small images and different scenery scopes, because it can be in the situation that not changing shooting distance change coverage by changing focal length, and can reduce and carry the quantity of apparatus for making a video recording and be widely used.
Existing common zoom lens is generally after to object scene, focusing is known, the close shot in object scene front or the distant view at rear are fuzzy, especially in long burnt part; Cause the main cause of this phenomenon to be: the planform of existing zoom lens, the parameters such as abbe number are mated bad with image-forming condition, make zoom lens can only ensure object scene and the clear while of close shot clear, or object scene and the clear while of distant view clear, be that existing zoom lens cannot obtain the enough large depth of field, thereby be difficult to ensure that object scene, close shot and distant view are simultaneously clear.
Summary of the invention
The object of the present invention is to provide a kind of zoom lens and digital camera, for improving the depth of field of zoom lens, thereby can obtain object scene, close shot and distant view picture rich in detail simultaneously.
To achieve these goals, the invention provides following technical scheme:
A kind of zoom lens, comprises the zoom group and the focus groups that set gradually from the object side to image side; Wherein,
Described zoom group comprises that the convex surface setting gradually is from the object side to image side that the first meniscus, the focal power of bearing is that the first biconcave lens, the convex surface of bearing is the first positive convex lens towards thing side and focal power towards thing side and focal power;
Described focus groups comprises that the focal power setting gradually is from the object side to image side that positive the first biconvex lens, convex surface is that the second convex lens, the focal power of bearing is that positive the second biconcave lens, focal power is that positive the second biconvex lens and focal power is the 3rd positive biconvex lens towards thing side and focal power.
Preferably, in described zoom group, the center of the center of described the first meniscus and the first biconcave lens is spaced apart 4.3mm on optical axis direction, and the center of described the first biconcave lens and the first convex lens are spaced apart 0.75mm on optical axis direction.
Preferably, described zoom group also comprises: the first packing ring between described the first biconcave lens and described the first convex lens.
Preferably, in described focus groups, the center of the center of described the first biconvex lens and the second convex lens is spaced apart 0.12mm on optical axis direction, the center of the center of described the second convex lens and the second biconcave lens is spaced apart 0.21mm on optical axis direction, the center of the center of described the second biconcave lens and the second biconvex lens is spaced apart 0.32mm on optical axis direction, and the center of the center of described the second biconvex lens and the 3rd biconvex lens is spaced apart 0.13mm on optical axis direction.
Preferably, described focus groups also comprises: the second packing ring between described the first biconvex lens and described the second convex lens, the 3rd packing ring between described the second biconvex lens and described the 3rd biconvex lens.
Further, described focus groups also comprises: be arranged at the lip-deep aperture diaphragm of described the first biconvex lens towards thing side.
Preferably, the material of described the second convex lens and the second biconvex lens is respectively the glass lens of low dispersion, high index of refraction.
The present invention also provides a kind of digital camera simultaneously, comprising: the zoom lens with above-mentioned feature.
Zoom lens provided by the invention adopts the lens of eight ad hoc structure shapes, and according to being extremely arranged in order as side from thing side, and the distribution of focal power by each optical lens, make the planform of zoom lens, the parameters such as abbe number are mated with image-forming condition, and can effectively reduce aberration, aberration and distortion, thus the image of object scene, close shot and distant view clearly can be obtained, and then reach the object that improves the zoom lens depth of field.In addition, Zoom lens structure provided by the invention is simple, compact, can reduce the outward appearance overall length of zoom lens, and then can reduce usage space and parking space.
Brief description of the drawings
The structural representation of a kind of zoom lens that Fig. 1 provides for the embodiment of the present invention;
The curve map of Fig. 2 optical transfer function during from 10m that is zoom lens in focusing;
Fig. 3 is the curve map of the optical transfer function of zoom lens in the time of minimum photographic distance 2m;
Fig. 4 is the curve map of the optical transfer function of zoom lens in the time dolly-out,ing dolly-back apart from infinite distance;
Fig. 5 is the dot chart that zoom lens is corresponding;
Fig. 6 is the sector diagram that zoom lens is corresponding;
Fig. 7 is the curvature of field distortion figure that zoom lens is corresponding;
Fig. 8 is the chromaticity difference diagram that zoom lens is corresponding.
Reference numeral:
1-the first meniscus, 2-the first biconcave lens, 3-the first convex lens,
4-aperture diaphragm, 5-the first biconvex lens, 6-the second convex lens, 7-the second biconcave lens,
8-the second biconvex lens, 9-the 3rd biconvex lens, 10-the first packing ring, 11-the second packing ring,
12-the 3rd packing ring.
Embodiment
In order to improve the depth of field of zoom lens, the invention provides a kind of zoom lens, adopt the lens of eight ad hoc structure shapes, and arrange with certain order, and pass through the distribution of the focal power of each optical lens, make the planform of zoom lens, the parameters such as abbe number are mated with image-forming condition, and can effectively reduce aberration, aberration and distortion, thus the image of object scene, close shot and distant view clearly can be obtained, and then reach the object that improves the zoom lens depth of field.
In order to make those skilled in the art better understand technical scheme of the present invention, below in conjunction with Figure of description, the embodiment of the present invention is described in detail.
The structural representation of a kind of zoom lens providing for the embodiment of the present invention as shown in Figure 1.This zoom lens comprises: this zoom lens comprises the zoom group and the focus groups that set gradually from the object side to image side; Wherein,
Zoom group comprises that the convex surface setting gradually is from the object side to image side that the first meniscus 1, the focal power of bearing is that the first biconcave lens 2, the convex surface of bearing is the first positive convex lens 3 towards thing side and focal power towards thing side and focal power;
Focus groups comprises that the focal power setting gradually is from the object side to image side that positive the first biconvex lens 5, convex surface is that the second convex lens 6, the focal power of bearing is that positive the second biconcave lens 7, focal power is that positive the second biconvex lens 8 and focal power is the 3rd positive biconvex lens 9 towards thing side and focal power.
In the present embodiment, each lens in zoom lens meet the listed condition of following table; Wherein, R
1for lens are towards the radius-of-curvature of the face of thing side, R
2for lens are towards the radius-of-curvature of the face of picture side, T
cfor lens center thickness, N
dfor the refractive index of lens, V
dfor the Abbe coefficient of lens.
| Lens sequence number | R1 | R2 | Tc | Nd | Vd |
| The first meniscus 1 | 15≤R1≤25 | 5≤R2≤8 | 0.6≤Tc≤0.8 | 1.4≤Nd≤1.6 | 55≤Vd≤65 |
| The first biconcave lens 2 | -25≤R1≤-15 | 5≤R2≤8 | 0.6≤Tc≤0.8 | 1.5≤Nd≤1.7 | 55≤Vd≤65 |
| The first convex lens 3 | 7≤R1≤9 | 20≤R2≤30 | 2.0≤Tc≤2.5 | 1.7≤Nd≤1.8 | 25≤Vd≤35 |
| The first biconvex lens 5 | 8≤R1≤10 | -35≤R2≤-25 | 1.7≤Tc≤1.8 | 1.6≤Nd≤1.7 | 55≤Vd≤65 |
| The second convex lens 6 | 6≤R1≤8 | 50≤R2≤65 | 1.7≤Tc≤1.8 | 1.6≤Nd≤1.7 | 55≤Vd≤65 |
| The second biconcave lens 7 | -20≤R1≤-10 | 5≤R2≤7 | 2.0≤Tc≤2.5 | 1.7≤Nd≤1.8 | 20≤Vd≤30 |
| The second biconvex lens 8 | 20≤R1≤30 | -20≤R2≤-10 | 1.6≤Tc≤1.7 | 1.6≤Nd≤1.7 | 55≤Vd≤65 |
| The 3rd biconvex lens 9 | 10≤R1≤20 | -50≤R2≤-40 | 1.6≤Tc≤1.7 | 1.6≤Nd≤1.7 | 55≤Vd≤65 |
As shown in Figure 2, Figure 3 and Figure 4, wherein, Fig. 2 optical transfer function (Modulation Transfer Function during from 10m that is zoom lens in focusing, hereinafter to be referred as MTF) curve map, Fig. 3 is the curve map of the optical transfer function of zoom lens in the time of minimum photographic distance 2m, and Fig. 4 is the curve map of the optical transfer function of zoom lens in the time dolly-out,ing dolly-back apart from infinite distance.Known from these three width figure, zoom lens is in the time taking close shot (focusing is from being 2m), object scene (focusing is from being 10m) and distant view (focusing is from being infinite distance), the curve map of MTF corresponding to three kinds of scenes is basically identical, and, in three kinds of scenes, MTF curve is all smoother and concentrated, that is to say, this zoom lens can be taken object scene, close shot and distant view simultaneously, and image quality is good; The zoom lens that visible employing the present embodiment provides can obtain the image of close shot, object scene and distant view clearly simultaneously, and the zoom lens that the present embodiment provides has the larger depth of field.
From technique scheme, the zoom lens that the embodiment of the present invention provides, adopt the lens of eight ad hoc structure shapes, and according to being extremely arranged in order as side from thing side, and pass through the distribution of the focal power of each optical lens, make the planform of zoom lens, the parameters such as abbe number are mated with image-forming condition, and can effectively reduce aberration, aberration and distortion, thus the image of object scene, close shot and distant view clearly can be obtained, and then reach the object that improves the zoom lens depth of field.In addition, Zoom lens structure provided by the invention is simple, compact, can reduce the outward appearance overall length of zoom lens, and then can reduce usage space and parking space.
It is worth mentioning that, above-mentioned zoom lens has following optical technology index: optics overall length TTL≤38mm, and the system focal distance f of zoom lens is 2.8-8mm, the system image planes of zoom lens are: 1/2.7 〞, Aperture Range F is 1.6-2.8.
Below by zoom lens is carried out to Optical system, further introduce the zoom lens that the present embodiment provides.
As shown in Figure 5, be dot chart corresponding to zoom lens.In the imaging process of geometrical optics, after optical system imaging, due to the existence of aberration, itself and image planes are no longer converged by many light that a bit send, but form distribution disc of confusion figure within the specific limits, be called point range figure.Utilize the dense degree of these points can weigh out the image quality of an optical system, as can be seen from Figure 5, the point of each visual field distributes very concentrated, and its barycenter radius only has 2.5um left and right, can find out that the image quality of the zoom lens that the embodiment of the present invention provides is fine.
As shown in Figure 6, be sector diagram corresponding to zoom lens.The tangent slope correspondence system curvature of field of aberration characteristic center of curve initial point, the slope of line that curve is right and the difference correspondence system spherical aberration of tangent slope; The height correspondence system coma of the line that curve is right and ordinate focus.
As shown in Figure 7, be curvature of field distortion figure corresponding to zoom lens; Wherein, curvature of field figure is taking image height as ordinate, weighs curvature of field value using the curvature of field as horizontal ordinate; Article three, curve T represents respectively the aberration of meridional beam (Tangential Rays) corresponding to three kinds of scenes (close shot, object scene and far away), article three, curve S represents respectively the aberration of sagittal beam (Sagittial Rays) corresponding to three kinds of scenes (close shot, object scene and far away), from this figure, can find out: meridianal curvature of field value is controlled within the scope of 0～0.05mm, Sagittal field curvature value is controlled within the scope of 0～0.05mm.Distortion figure is taking image height as ordinate, weighs curvature of field value to distort as horizontal ordinate, and aberration rate is controlled in-50%～0 scope.
As shown in Figure 8, be chromaticity difference diagram corresponding to zoom lens.Chromaticity difference diagram ordinate represents beam size, and horizontal ordinate represents spherical aberration and axial chromatic aberration.Can draw from this figure, zoom lens provided by the invention, spherical aberration and axial chromatic aberration are controlled between-0.05～+ 0.05.
From above-mentioned Fig. 5, Fig. 6, Fig. 7 and Fig. 8, although the Zoom lens structure size that the present embodiment provides is less, the astigmatism of its generation, curvature of field distortion and aberration are still controlled or are revised in less scope.
When concrete enforcement, in zoom group, the center of the center of the first meniscus 1 and the first biconcave lens 2 is spaced apart 4.3mm on optical axis direction, and the center of the first biconcave lens 2 and the first convex lens 3 are spaced apart 0.75mm on optical axis direction.In order to make the position of each lens in zoom group relatively fixing, the interval between each lens of strict guarantee, wherein, the edge of the first meniscus 1 and the first biconcave lens 2
Edge directly contact, relatively fixing with the face way of contact; The first biconcave lens 2 and the first convex lens 3 because of planform and towards restriction, preferably, first packing ring 10 is set between the first biconcave lens 2 and the first convex lens 3 and ensures interval, that is to say, zoom group also comprises: the first packing ring 10 between the first biconcave lens 2 and the first convex lens 3.
In focus groups, the center of the center of the first biconvex lens 5 and the second convex lens 6 is spaced apart 0.12mm on optical axis direction, the center of the center of the second convex lens 6 and the second biconcave lens 7 is spaced apart 0.21mm on optical axis direction, the center of the center of the second biconcave lens 7 and the second biconvex lens 8 is spaced apart 0.32mm on optical axis direction, and the center of the center of the second biconvex lens 8 and the 3rd biconvex lens 9 is spaced apart 0.13mm on optical axis direction.In order to make the position of each lens in focus groups relatively fixing, interval between each lens of strict guarantee, wherein, the first biconvex lens 5, the second convex lens 6, the second biconvex lens 8 and the 3rd biconvex lens 9 because of planform and towards restriction, preferably, second packing ring 11 is set between the first biconvex lens 5 and the second convex lens 6 and ensures interval, the 3rd packing ring 12 is set between the second biconvex lens 8 and the 3rd biconvex lens 9 and ensures interval; That is to say, focus groups also comprises: the second packing ring 11 between the first biconvex lens 5 and the second convex lens 6, the 3rd packing ring 12 between the second biconvex lens 8 and the 3rd biconvex lens 9.
Further, in order to limit, to enter light focus groups from zoom group good, and above-mentioned focus groups also comprises: be arranged at the lip-deep aperture diaphragm 4 of the first biconvex lens 5 towards thing side.
In order to make zoom lens can realize day and night, infrared band and visible light wave range are confocal, and preferably, the material of above-mentioned the second convex lens 6 and the second biconvex lens 8 is respectively the glass lens of low dispersion, high index of refraction.
The present invention also provides a kind of digital camera simultaneously, comprising: the zoom lens with above-mentioned feature.
In sum, zoom lens provided by the invention has zoom group and two lens group structures of focus groups, and each lens position in zoom group is relatively fixing, each lens position in focus groups is relatively fixing, the distribution of the focal power by each optical lens, make the planform of zoom lens, the parameters such as abbe number are mated with image-forming condition, and aberration, aberration and distortion can effectively be reduced, thereby can obtain the image of object scene, close shot and distant view clearly, and then reach the object that improves the zoom lens depth of field.
In addition, Zoom lens structure provided by the invention is simple, compact, can reduce the outward appearance overall length of zoom lens, and then can reduce usage space and parking space.
Obviously, those skilled in the art can carry out various changes and modification and not depart from the spirit and scope of the present invention the present invention.Like this, if these amendments of the present invention and within modification belongs to the scope of the claims in the present invention and equivalent technologies thereof, the present invention is also intended to comprise these changes and modification interior.
Claims (8)
1. a zoom lens, is characterized in that, comprises the zoom group and the focus groups that set gradually from the object side to image side; Wherein,
Described zoom group comprises that the convex surface setting gradually is from the object side to image side that the first meniscus, the focal power of bearing is that the first biconcave lens, the convex surface of bearing is the first positive convex lens towards thing side and focal power towards thing side and focal power;
Described focus groups comprises that the focal power setting gradually is from the object side to image side that positive the first biconvex lens, convex surface is that the second convex lens, the focal power of bearing is that positive the second biconcave lens, focal power is that positive the second biconvex lens and focal power is the 3rd positive biconvex lens towards thing side and focal power.
2. zoom lens as claimed in claim 1, it is characterized in that, in described zoom group, the center of the center of described the first meniscus and the first biconcave lens is spaced apart 4.3mm on optical axis direction, and the center of described the first biconcave lens and the first convex lens are spaced apart 0.75mm on optical axis direction.
3. zoom lens as claimed in claim 2, is characterized in that, described zoom group also comprises: the first packing ring between described the first biconcave lens and described the first convex lens.
4. the zoom lens as described in claim 1,2 or 3, it is characterized in that, in described focus groups, the center of the center of described the first biconvex lens and the second convex lens is spaced apart 0.12mm on optical axis direction, the center of the center of described the second convex lens and the second biconcave lens is spaced apart 0.21mm on optical axis direction, the center of the center of described the second biconcave lens and the second biconvex lens is spaced apart 0.32mm on optical axis direction, and the center of the center of described the second biconvex lens and the 3rd biconvex lens is spaced apart 0.13mm on optical axis direction.
5. zoom lens as claimed in claim 4, is characterized in that, described focus groups also comprises: be arranged at the lip-deep aperture diaphragm of described the first biconvex lens towards thing side.
6. zoom lens as claimed in claim 5, it is characterized in that, described focus groups also comprises: the second packing ring between described the first biconvex lens and described the second convex lens, the 3rd packing ring between described the second biconvex lens and described the 3rd biconvex lens.
7. zoom lens as claimed in claim 1, is characterized in that, the material of described the second convex lens and the second biconvex lens is respectively the glass lens of low dispersion, high index of refraction.
8. a digital camera, is characterized in that, comprising: the zoom lens as described in as arbitrary in claim 1-7.
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| CN201310106796.4A CN104076497B (en) | 2013-03-28 | 2013-03-28 | Zoom lens and digital camera |
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| CN201310106796.4A CN104076497B (en) | 2013-03-28 | 2013-03-28 | Zoom lens and digital camera |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105372797A (en) * | 2015-11-05 | 2016-03-02 | 福建福光股份有限公司 | Miniature zooming aspheric lens |
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| JPH11344670A (en) * | 1998-06-02 | 1999-12-14 | Ricoh Co Ltd | Zoom lens |
| US20070139787A1 (en) * | 2005-12-15 | 2007-06-21 | Samsung Techwin Co., Ltd. | Compact zoom lens |
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| US20070139787A1 (en) * | 2005-12-15 | 2007-06-21 | Samsung Techwin Co., Ltd. | Compact zoom lens |
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