CN204009212U - A kind of zoom lens and a kind of image capture device - Google Patents
A kind of zoom lens and a kind of image capture device Download PDFInfo
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- CN204009212U CN204009212U CN201420462752.5U CN201420462752U CN204009212U CN 204009212 U CN204009212 U CN 204009212U CN 201420462752 U CN201420462752 U CN 201420462752U CN 204009212 U CN204009212 U CN 204009212U
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Abstract
The utility model discloses a kind of zoom lens and image capture device, relate to technical field of imaging, in order to improve the depth of field of zoom lens.A kind of zoom lens that the utility model embodiment provides, comprise the zoom group and the focus groups that set gradually from the object side to image side, wherein, described zoom group comprises that the focal power setting gradually is from the object side to image side that the first plano-concave lens, the focal power of bearing is that the first biconcave lens and the focal power of bearing is the first positive biconvex lens, wherein, the plane of described the first plano-concave lens is towards thing side; Described focus groups comprises that the focal power setting gradually is from the object side to image side that positive the second biconvex lens, focal power is that the first meniscus lens, the focal power of bearing is that positive the 3rd biconvex lens, focal power is that the second biconcave lens, the focal power of bearing is that positive the 4th biconvex lens and focal power is the second meniscus lens of bearing, wherein, the concave surface of the concave surface of described the first meniscus lens and described the second meniscus lens is all towards thing side.
Description
Technical field
The utility model relates to technical field of imaging, relates in particular to a kind of zoom lens and image capture device.
Background technology
Zoom lens refers to and can convert within the specific limits focal length, thereby obtains 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 in the time taking, and after clear to object scene focusing, the close shot in object scene front or the distant view at rear are normally 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 that object scene and close shot are simultaneously clear, or object scene and distant view are simultaneously 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 three are simultaneously clear.Concrete, common zoom lens is only optimized and aberration correction for a certain individually defined thing distance in design, and other scenery (being distant view and close shot) that are positioned at object scene front and back spatial dimension have out of focus phenomenon in various degree; Because depth of field size is inversely proportional to focal length square, so can show more obvious at telescope end; Like this, will inevitably cause the scope of the common zoom lens depth of field less.
To sum up, existing zoom lens cannot obtain the enough large depth of field.
Utility model content
The utility model embodiment provides a kind of zoom lens and image capture device, in order to improve the depth of field of zoom lens.
A kind of zoom lens that the utility model embodiment provides, 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 focal power setting gradually is from the object side to image side that the first plano-concave lens, the focal power of bearing is that the first biconcave lens and the focal power of bearing is the first positive biconvex lens, and wherein, the plane of described the first plano-concave lens is towards thing side;
Described focus groups comprises that the focal power setting gradually is from the object side to image side that positive the second biconvex lens, focal power is that the first meniscus lens, the focal power of bearing is that positive the 3rd biconvex lens, focal power is that the second biconcave lens, the focal power of bearing is that positive the 4th biconvex lens and focal power is the second meniscus lens of bearing, wherein, the concave surface of the concave surface of described the first meniscus lens and described the second meniscus lens is all towards thing side.
The zoom lens that the utility model embodiment provides, adopt the lens of nine 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, can obtain the image of object scene, close shot and distant view clearly, can reach the object that expands the zoom lens depth of field.
Preferably, described the first biconcave lens and described the first biconvex lens gummed, described the second biconvex lens and described the first meniscus lens gummed, described the 3rd biconvex lens and the second biconcave lens gummed.At this, connect by the mode of gummed, can effectively reduce aberration.
Preferably, described focus groups also comprises: the lip-deep aperture diaphragm towards thing side that is arranged at described the second biconvex lens.
Preferably, described focus groups also comprises:
Be arranged at the first packing ring between the first meniscus lens and the 3rd biconvex lens, described the first packing ring is for fixing the relative position between the first meniscus lens and the 3rd biconvex lens;
Be arranged at the second packing ring between the second biconcave lens and the 4th biconvex lens, described the second packing ring is for fixing the relative position between the second biconcave lens and the 4th biconvex lens.
Preferably, the Abbe coefficient of described the second biconcave lens is greater than 55, and refractive index is greater than 1.58; The Abbe coefficient of the 4th biconvex lens is greater than 60, and refractive index is greater than 1.6.
Preferably,
Between focal distance f ' 2 of the focal distance f of zoom group ' 1 and focus groups, meet: f ' 1>f ' 2;
Zoom lens is in the focal distance f of telescope end the focal distance f of wide-angle side ' T and the zoom lens ' meets between W:
2.5<f’T/f’W<3.2；
The focal distance f of zoom group ' 1 and zoom lens are in the focal distance f of wide-angle side ' meet between W:
2.15<f’1/f’W<2.35；
The displacement dd1 of zoom lens zoom group during from wide-angle side to telescope end zoom, zoom lens are in the focal distance f of telescope end the focal distance f of wide-angle side ' T and the zoom lens ' meets W:
0.5<dd1/(f’T-f’W)<0.7；
The refractive index of the first meniscus lens is greater than 1.8;
When zoom lens is positioned at wide-angle side from the first plano-concave lens towards the summit of thing side to image planes at the distance L W of optical axis direction and zoom lens the focal distance f in wide-angle side ' meet W:
5.5<LW/f’W<5.8；
Rear cut-off distance fbw when zoom lens is positioned at wide-angle side and zoom lens are in the focal distance f of wide-angle side ' meet between W:
0.8<fbw/f’W<1.1。
Preferably, in described zoom group, the span at the interval of the center of the center of described the first plano-concave lens and described the first biconcave lens on optical axis direction is [1mm, 1.5mm];
In described focus groups, the span at interval on optical axis direction on optical axis direction, center of the center of described the first meniscus lens and described the 3rd biconvex lens is [0.1mm, 0.3mm]; The span at the interval of the center of the center of described the second biconcave lens and the 4th biconvex lens on optical axis direction is [1.05mm, 2.05mm]; The span at the interval of the center of the center of described the 4th biconvex lens and described the second meniscus lens on optical axis direction is [0.1mm, 0.64mm].
Preferably, in described zoom group, the center of the center of described the first plano-concave lens and described the first biconcave lens is spaced apart 1.25mm on optical axis direction;
In described focus groups, the center of the center of described the first meniscus lens and described the 3rd biconvex lens is spaced apart 0.1mm on optical axis direction on optical axis direction, the center of the center of described the second biconcave lens and the 4th biconvex lens is spaced apart 1.55mm on optical axis direction, and the center of the center of described the 4th biconvex lens and described the second meniscus lens is spaced apart 0.34mm on optical axis direction.
Preferably, described zoom lens also comprises motor driver, zoom gear group and linkage, and wherein, described zoom group and described focus groups are arranged in described linkage,
Described motor driver is connected with described zoom gear group, drives described zoom gear group to rotate;
Described zoom gear group drags described linkage motion while rotation, the motion of described linkage drives described zoom group and the described focus groups synchronizing moving of described linkage inside.
A kind of image capture device that the utility model embodiment provides, comprises above-mentioned zoom lens.The image capture device that the utility model embodiment provides can be digital camera or Digital Video.
Brief description of the drawings
A kind of zoom lens that Fig. 1 provides for the utility model embodiment is at the structural representation of wide-angle side;
Fig. 2 is the curve map of zoom lens optical transfer function during from 10m in wide-angle side focusing of the utility model embodiment mono-;
Fig. 3 is the curve map of the zoom lens of the utility model embodiment mono-optical transfer function in the time of wide-angle side minimum photographic distance 5m;
Fig. 4 is the curve map of the zoom lens of the utility model embodiment mono-optical transfer function in the time that wide-angle side is dolly-out,ed dolly-back apart from infinite distance;
Fig. 5 (a) is that the zoom lens of the utility model embodiment mono-is at curvature of field figure corresponding to wide-angle side;
Fig. 5 (b) is that the zoom lens of the utility model embodiment mono-is at distortion figure corresponding to wide-angle side;
Fig. 6 is that the zoom lens of the utility model embodiment mono-is at chromaticity difference diagram corresponding to wide-angle side;
Fig. 7 be the zoom lens of the utility model embodiment mono-in telescope end focusing the curve map from the optical transfer function when the 20m;
Fig. 8 is the curve map of the zoom lens of the utility model embodiment mono-optical transfer function in the time of telescope end minimum photographic distance 6m;
Fig. 9 is the curve map of the zoom lens of the utility model embodiment mono-optical transfer function in the time that telescope end is dolly-out,ed dolly-back apart from infinite distance;
Figure 10 (a) is that the zoom lens of the utility model embodiment mono-is at curvature of field figure corresponding to telescope end;
Figure 10 (b) is that the zoom lens of the utility model embodiment mono-is at distortion figure corresponding to telescope end;
Figure 11 is that the zoom lens of the utility model embodiment mono-is at chromaticity difference diagram corresponding to telescope end;
The structural representation of a kind of zoom lens that Figure 12 provides for the utility model embodiment bis-;
Figure 13 is the cam curve figure of the zoom lens shown in Figure 12.
Reference numeral:
1-the first plano-concave lens, 2-the first biconcave lens, 3-the first biconvex lens,
4-aperture diaphragm, 5-the second biconvex lens, 6-the first meniscus lens, 7-the 3rd biconvex lens,
8-the second biconcave lens, 9-the 4th biconvex lens, 10-the second meniscus lens, 11-the first packing ring,
12-the second packing ring, 21-motor driver, 22-zoom gear group, 23-linkage.
Embodiment
In order to improve the depth of field of zoom lens, the utility model provides a kind of zoom lens, adopt the lens of nine ad hoc structure shapes, and arrange with certain order, and the distribution of focal power by each optical lens, 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.
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is clearly and completely described, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtaining under creative work prerequisite, all belong to the scope of the utility model protection.
As shown in Figure 1, a kind of zoom lens providing for the utility model case study on implementation is at the structural representation of wide-angle side.This zoom lens comprises: the zoom group setting gradually from the object side to image side and focus groups; Wherein, described zoom group comprises that the plane setting gradually is from the object side to image side that the first plano-concave lens 1, the focal power of bearing is that the first biconcave lens 2, the focal power of bearing is the first positive biconvex lens 3 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 second biconvex lens 5, focal power is that the first meniscus lens 6, the focal power of bearing is that positive the 3rd biconvex lens 7, focal power is that the second biconcave lens 8, the focal power of bearing is that positive the 4th biconvex lens 9 and focal power is the second meniscus lens 10 of bearing.
Preferably, in order to reduce aberration, described the first biconcave lens and described the first biconvex lens gummed, described the second biconvex lens and described the first meniscus lens gummed, described the 3rd biconvex lens and the second biconcave lens gummed.Wherein, bonding technique adopts prior art, does not repeat them here.
Preferably, enter the luminous flux focus groups in order to limit from zoom group, above-mentioned focus groups also comprises: be arranged at the lip-deep aperture diaphragm 4 of the second biconvex lens 5 towards thing side.
Preferably, in order to make the position of each lens in focus groups relatively fixing, interval between each lens of strict guarantee, wherein, the second biconvex lens 5, the first meniscus lens 6, the 3rd biconvex lens 7, the second biconcave lens 8, the 4th biconvex lens 9, the second meniscus lens 10 because of planform and towards restriction, first packing ring 11 is set between the first meniscus lens 6 and the 3rd biconvex lens 7 and ensures interval, second packing ring 12 is set between the second biconcave lens 8 and the 4th biconvex lens 9 and ensures interval; Wherein, the structure of the first packing ring and the second packing ring needs to determine according to the design of the internal diameter of lens barrel and optical property, and material can adopt prior art, for example, can select aluminum material; In addition, it should be noted that, this second packing ring 12 also plays the effect of vignetting stop: because aperture proper proportion is dwindled, blocked the wide-aperture light of a part of large visual field, so it has played the effect of vignetting stop, be conducive to promote image quality; Such as this second packing ring has blocked the light beyond 0.86 aperture of 0.7 visual field, retain 0.86 light with internal orifice dimension, thereby made 0.7 visual field picture element better, and can not fallen by gear completely.
Preferably, in order to make zoom lens can realize day and night, infrared band and visible light wave range are confocal, and the Abbe coefficient of above-mentioned the second biconcave lens 8 is greater than 55, and refractive index is greater than 1.58; The Abbe coefficient of the 4th biconvex lens is greater than 60, and refractive index is greater than 1.6.
Preferably, in this zoom lens, each parameter meets the following conditions:
Between focal distance f ' 2 of the focal distance f of zoom group ' 1 and focus groups, meet: f ' 1>f ' 2;
Zoom lens is in the focal distance f of telescope end the focal distance f of wide-angle side ' T and the zoom lens ' meets between W:
2.5<f’T/f’W<3.2；
The focal distance f of zoom group ' 1 and zoom lens are in the focal distance f of wide-angle side ' meet between W:
2.15<f’1/f’W<2.35；
The displacement dd1 of zoom lens zoom group during from wide-angle side to telescope end zoom, zoom lens are in the focal distance f of telescope end the focal distance f of wide-angle side ' T and the zoom lens ' meets W:
0.5<dd1/(f’T-f’W)<0.7；
The refractive index of the first meniscus lens is greater than 1.8;
When zoom lens is positioned at wide-angle side from the first plano-concave lens towards the summit of thing side to image planes at the distance L W of optical axis direction and zoom lens the focal distance f in wide-angle side ' meet W:
5.5<LW/f’W<5.8；
Rear cut-off distance fbw when zoom lens is positioned at wide-angle side and zoom lens are in the focal distance f of wide-angle side ' meet between W:
0.8<fbw/f’W<1.1。
In the time meeting above condition, ensure that the aberration of whole system is well proofreaied and correct, zoom ratio reaches request for utilization.
Preferably, in zoom group, the span at the interval of the center of the center of the first plano-concave lens 1 and the first biconcave lens 2 on optical axis direction is [1mm, 1.5mm]; 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 plano-concave lens 1 directly contacts with the edge of the first biconcave lens 2, relatively fixing with the face way of contact; And the first biconcave lens 2 and first biconvex lens 3 the two gummed save a spacer ring like this;
In focus groups, the second biconvex lens 5 and first meniscus lens 6 the two gummed, form two gummed eyeglasses, the span at interval on optical axis direction on optical axis direction, center of the center of the first meniscus lens 6 and the 3rd biconvex lens 7 is [0.1mm, 0.3mm]; The 3rd biconvex lens 7 and the second biconcave lens 8 glue together, and form two gummed eyeglasses; The span at the interval of the center of the center of the second biconcave lens 8 and the 4th biconvex lens 9 on optical axis direction is [1.05mm, 2.05mm]; The span at the center of the 4th biconvex lens 9 and the second interval of meniscus lens 10 center on optical axis direction is [0.1mm, 0.64mm].
In a preferred embodiment, in zoom group, the center of the center of the first plano-concave lens 1 and the first biconcave lens 2 is spaced apart 1.25mm on optical axis direction;
In focus groups, the center of the center of the first meniscus lens 6 and the 3rd biconvex lens 7 is spaced apart 0.1mm on optical axis direction, the center of the center of the second biconcave lens 8 and the 4th biconvex lens 9 is spaced apart 1.55mm on optical axis direction, and the center of the 4th biconvex lens 9 and the second meniscus lens 10 center are spaced apart 0.34mm on optical axis direction.
In specific implementation process, in the time that the internal diameter value of the lens barrel of this zoom lens is fixing, such as being Φ 10, the parameter of each lens of described zoom lens meets the listed condition of table one:
Table one
Wherein, R1 is the radius-of-curvature of lens towards the face of thing side, and R2 is the radius-of-curvature of lens towards the face of picture side, and Tc is lens center thickness, the refractive index that Nd is lens, the Abbe coefficient that Vd is lens; Certainly, if some parameter values of one of them lens are fixed, the value of other each parameter of this zoom lens is all fixing, for example, in a preferred embodiment, in the time that the R2 value of the first plano-concave lens 1 is 29.277, the parameter of each lens in described zoom lens meets the listed condition of following table two:
| Lens sequence number | R1(mm) | R2(mm) | Tc(mm) | Nd | Vd |
| 1 | ∞ | 29.277 | 1.14 | 1.723 | 38.022 |
| 2 | -13.355 | 13.2 | 0.7 | 1.806 | 40.945 |
| 3 | 13.25 | -27.2 | 2.19 | 1.785 | 25.72 |
| 5 | 13.376 | -9.1 | 3.19 | 1.617 | 53.928 |
| 6 | -9.1 | -34.6 | 0.7 | 1.847 | 23.79 |
| 7 | 8.18 | -8.18 | 3.9 | 1.657 | 51.157 |
| 8 | -8.18 | 5.4 | 1.31 | 1.623 | 56.952 |
| 9 | 8.134 | -18.15 | 3.33 | 1.618 | 63.417 |
| 10 | -7.7 | -27.954 | 1.29 | 1.702 | 41.14 |
Table two
Below in conjunction with accompanying drawing and specific embodiment, the utility model is described.
Embodiment mono-
In embodiment mono-, as shown in Figure 1, this zoom lens comprises described zoom lens: the zoom group setting gradually from the object side to image side and focus groups; Wherein, described zoom group comprises that the plane setting gradually is from the object side to image side that the first plano-concave lens 1, the focal power of bearing is that the first biconcave lens 2, the focal power of bearing is the first positive biconvex lens 3 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 second biconvex lens 5, focal power is that the first meniscus lens 6, the focal power of bearing is that positive the 3rd biconvex lens 7, focal power is that the second biconcave lens 8, the focal power of bearing is that positive the 4th biconvex lens 9 and focal power is the second meniscus lens 10 of bearing; Wherein, described the first biconcave lens 2 glues together with described the first biconvex lens 3, and described the second biconvex lens 5 glues together with described the first meniscus lens 6, and described the 3rd biconvex lens 7 and the second biconcave lens 8 glue together;
Be arranged at the lip-deep aperture diaphragm 4 of the second biconvex lens 5 towards thing side;
Be arranged on the first packing ring 11 between the first meniscus lens 6 and the 3rd biconvex lens 7;
The second packing ring 12 arranging between the second biconcave lens 8 and the 4th biconvex lens 9 ensures interval.
Wherein, each lens meet the determined condition of table two, and this zoom lens meets in the time of wide-angle side: in zoom group, the center of the center of the first plano-concave lens 1 and the first biconcave lens 2 is spaced apart 1.25mm on optical axis direction; In focus groups, the center of the center of the first meniscus lens 6 and the 3rd biconvex lens 7 is spaced apart 0.1mm on optical axis direction, the center of the center of the second biconcave lens 8 and the 4th biconvex lens 9 is spaced apart 1.55mm on optical axis direction, and the center of the 4th biconvex lens 9 and the second meniscus lens 10 center are spaced apart 0.34mm on optical axis direction.
Below in conjunction with optical transfer function (Modulation Transfer Function, the MTF) curve map of this zoom lens, the situation that the zoom lens that the utility model embodiment mono-is provided is realized the large depth of field describes.Wherein, optical transfer function is used for evaluating the image quality of an optical system, and its curve is higher, more level and smooth, shows that the image quality of system is better.
As shown in Figure 2, Figure 3 and Figure 4, wherein, the curve map of Fig. 2 optical transfer function during from 10m that is zoom lens in wide-angle side focusing, Fig. 3 is the curve map of the optical transfer function of zoom lens in the time of wide-angle side minimum photographic distance 5m, and Fig. 4 is the curve map of the optical transfer function of zoom lens in the time that wide-angle side is dolly-out,ed dolly-back apart from infinite distance.Known from this three width figure, when zoom lens is taken close shot (object distance is 5m), object scene (object distance is 10m) and distant view (object distance is infinite distance) in wide-angle side, 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 one provides can obtain the image of close shot, object scene and distant view clearly simultaneously, and the zoom lens that the present embodiment one provides has the larger depth of field.
It is worth mentioning that, above-mentioned zoom lens has following optical technology index:
Optics overall length TTL≤46mm;
The system focal distance f of zoom lens is 7-22mm;
The system image planes of zoom lens: 1/2.7 〞;
Aperture Range F is 1.6-2.8.
Below by zoom lens is carried out to detailed Optical system, further introduce the zoom lens that the present embodiment one provides.
As shown in Fig. 5 (a), be zoom lens curvature of field figure of (focusing from) when the wide-angle side; Wherein, article three, curve T represents respectively the aberration of the meridional beam (Tangential Rays) that three kinds of wavelength (486nm, 587nm and 656nm) are corresponding, article three, curve S represents respectively the aberration of the sagittal beam (Sagittial Rays) that three kinds of wavelength (486nm, 587nm and 656nm) are corresponding, tangent curvature of field value is controlled within the scope of 0～0.05mm, and Sagittal field curvature value is controlled within the scope of 0～0.05mm.
As shown in Fig. 5 (b), be the distortion figure of zoom lens when the wide-angle side, aberration rate is controlled in-9%～0 scope.
As shown in Figure 6, be the chromaticity difference diagram of zoom lens when the wide-angle side.In figure, curve represents elementary aberration family curve, visible, and elementary Difference Control is between-0.05～+ 0.05.
From above-mentioned Fig. 5 (a), 5 (b) and Fig. 6, the zoom lens that the present embodiment provides, spherical aberration, coma, astigmatism and the aberration of its generation can be controlled in less scope.
Be more than the explanation that each accompanying drawing when the wide-angle side carries out in conjunction with this zoom lens, for the zoom lens that further illustrates the utility model embodiment and provide can improve the depth of field, describe at each accompanying drawing of telescope end below in conjunction with this zoom lens.
As shown in Figure 7, Figure 8 and Figure 9, wherein, the curve map of Fig. 7 optical transfer function during from 20m that is zoom lens in telescope end focusing, Fig. 8 is the curve map of the optical transfer function of zoom lens in the time of telescope end minimum photographic distance 6m, and Fig. 9 is the curve map of the optical transfer function of zoom lens in the time that telescope end is dolly-out,ed dolly-back apart from infinite distance.Known from this three width figure, when zoom lens is taken close shot (object distance is 6m), object scene (object distance is 20m) and distant view (object distance is infinite distance) at telescope end, 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 also can be taken object scene, close shot and distant view at telescope end simultaneously, and image quality is good.
Below by zoom lens is carried out to detailed Optical system, further introduce the zoom lens that the present embodiment one provides.
As shown in Figure 10 (a), be zoom lens curvature of field figure of (focusing from) when the telescope end; Wherein, article three, curve T represents respectively the aberration of the meridional beam (Tangential Rays) that three kinds of wavelength (486nm, 587nm and 656nm) are corresponding, article three, curve S represents respectively the aberration of the sagittal beam (Sagittial Rays) that three kinds of wavelength (486nm, 587nm and 656nm) are corresponding, tangent curvature of field value is controlled within the scope of 0～0.1mm, and Sagittal field curvature value is controlled within the scope of 0～0.1mm.
As shown in Figure 10 (b), be the distortion figure of zoom lens when the telescope end, aberration rate is controlled in-1%～0 scope.
As shown in figure 11, be the chromaticity difference diagram of zoom lens when the telescope end.In figure, curve represents elementary aberration family curve, visible, and elementary Difference Control is between-0.05～+ 0.05.
From above-mentioned Figure 10 (a), 10 (b) and Figure 11, the zoom lens that the present embodiment provides is at telescope end, and the spherical aberration of its generation, coma, astigmatism and aberration can be controlled in less scope.
Therefore, the zoom lens that the utility model embodiment mono-provides, adopt the lens of nine 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, can effectively reduce monochromatic aberration, aberration, thereby can obtain the image of object scene, close shot and distant view clearly, and then reach the object that expands the zoom lens depth of field.Moreover the Zoom lens structure that the utility model provides is simple, compact, can reduces the outward appearance overall length of zoom lens, and then can reduce usage space and parking space.
Embodiment bis-
In embodiment mono-, describe the optical property of the zoom lens that the utility model provides in detail, the zoom lens with above-mentioned optical property can be manually to control, only, in the time of manual control, after realizing zoom, need the adjusting time of growing just can realize focusing very much, before causing focusing on after zoom, the shown picture of camera lens is all unsharp.Therefore, the present embodiment two provides a kind of zoom lens of automatic control.
As shown in figure 12, the zoom lens that the utility model embodiment bis-provides, comprises above-mentioned zoom group and focus groups, also comprises:
Motor driver 21, zoom gear group 22 and linkage 23, wherein, zoom group and focus groups are arranged in described linkage 23,
Motor driver 21 is connected with zoom gear group 22, drives zoom gear group 22 to rotate;
Described zoom gear group 22 drags described linkage 23 and moves while rotation, the motion of described linkage 23 drives described zoom group and the described focus groups synchronizing moving of described linkage 23 inside.
Herein; because each zoom lens all exists an outer stationary magazine creel in order to protection and all elements of fixing internal; therefore this zoom group and this focus groups are also subject to the straight-line groove restriction of outer stationary magazine creel inner side simultaneously; do rectilinear motion and can not rotate so the two can only prolong optical axis; this implementation adopts prior art, does not repeat them here.
Preferably, motor driver 21 comprises a motor, and motor is direct current generator or stepper motor.In the time of needs zoom, motor driver 21 rotates according to the driving signal receiving, and drive zoom gear group 22 to rotate, zoom gear group 22 drags linkage 23 and moves, herein, this linkage can be a rotary cylinder, and the gear driven rotary cylinder of zoom gear group 22 rotates, zoom group and focus groups are to be all assemblied in rotary cylinder inside, and then drive zoom group and the focus groups synchronizing moving of rotary cylinder inside.
Zoom group and focus groups have the position of unique correspondence in moving process, and, for the optional position at zoom group place, focus groups has and its unique corresponding position, thereby realizing in the process of zoom and focusing synchronous, it is clear to ensure to focus on.
Thereby the zoom lens that the utility model embodiment bis-provides can make zoom group and focus groups move, and makes zoom and focusing synchronous simultaneously, can realize zoom process whole process clear.
Further, the driving signal that motor driver 21 receives is in advance according to the analog computation of position relationship to zoom group and focus groups and definite, and the position relationship of zoom group and focus groups is embodied in the cam curve figure of zoom group and focus groups.As shown in figure 13, the cam curve figure of zoom group and focus groups in the zoom lens of the automatic control providing for the utility model embodiment bis-, wherein, preferred, zoom group and focus groups adopt definite zoom group and the focus groups of embodiment mono-.As shown in Figure 13, zoom group and focus groups have the position of unique correspondence in moving process, and for example, in wide-angle side, corner is 0 while spending, be positioned at-9.96mm of zoom group, and focus groups is positioned at 7.6mm; At telescope end, corner is 75.5 while spending, and be positioned at-1.75mm of zoom group focus groups is positioned at 0.05mm, moving the process of zoom from wide-angle side to telescope end, arbitrary position as corner be 31 while spending, be positioned at-3.08mm of zoom group focus groups is positioned at 4.5mm.It should be noted that, all calculate with respect to reference datum the position relating in this section, in reference field left side for negative, on reference field right side for just; And the position of reference field is in image planes left side, apart from the position of image planes 30.47mm.Thereby, in advance according to the zoom group obtaining and the cam curve of focus groups, the driving signal of design motor driver, in the time of this zoom lens real work, while forwarding a certain corner to, motor driver 21 rotates according to the driving signal receiving, and drive zoom gear group 22 to rotate, zoom gear group 22 drags linkage 23 and moves, and control described zoom group and the focus groups synchronizing moving of linkage 23 inside, control zoom group and focus groups synchronizing moving to position separately in the cam curve shown in Figure 13, thereby can realize picture in the process of zoom is all clearly.
In addition, the utility model also provides a kind of image capture device, and this image capture device comprises the zoom lens described in embodiment mono-or embodiment bis-.The image capture device that the utility model embodiment provides, for example, can be digital camera or data video camera, in this no limit.
In sum, the utility model embodiment provides a kind of zoom lens and image capture device, in order to improve the depth of field of zoom lens.The zoom lens that the utility model provides 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 can effectively be reduced, thereby can obtain the image of object scene, close shot and distant view clearly, and then reach the object that expands the zoom lens depth of field.In addition, the Zoom lens structure that the utility model provides is simple, compact, can reduce the outward appearance overall length of zoom lens, and then can reduce usage space and parking space.And the utility model embodiment also provides a kind of zoom lens of automatic control, be connected with zoom gear group by motor driver, drive zoom gear group to rotate; Described zoom gear group drags described linkage motion while rotation, the motion of described linkage drives described zoom group and the described focus groups synchronizing moving of described linkage inside.
Obviously, those skilled in the art can carry out various changes and modification and not depart from spirit and scope of the present utility model the utility model.Like this, if these amendments of the present utility model and within modification belongs to the scope of the utility model claim and equivalent technologies thereof, the utility model is also intended to comprise these changes and modification interior.
Claims (10)
1. a zoom lens, is characterized in that, described camera 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 focal power setting gradually is from the object side to image side that the first plano-concave lens, the focal power of bearing is that the first biconcave lens and the focal power of bearing is the first positive biconvex lens, and wherein, the plane of described the first plano-concave lens is towards thing side;
Described focus groups comprises that the focal power setting gradually is from the object side to image side that positive the second biconvex lens, focal power is that the first meniscus lens, the focal power of bearing is that positive the 3rd biconvex lens, focal power is that the second biconcave lens, the focal power of bearing is that positive the 4th biconvex lens and focal power is the second meniscus lens of bearing, wherein, the concave surface of the concave surface of described the first meniscus lens and described the second meniscus lens is all towards thing side.
2. zoom lens according to claim 1, is characterized in that, described the first biconcave lens and described the first biconvex lens gummed, described the second biconvex lens and described the first meniscus lens gummed, described the 3rd biconvex lens and the second biconcave lens gummed.
3. zoom lens according to claim 2, is characterized in that, described focus groups also comprises: the lip-deep aperture diaphragm towards thing side that is arranged at described the second biconvex lens.
4. zoom lens according to claim 3, is characterized in that, described focus groups also comprises:
Be arranged at the first packing ring between the first meniscus lens and the 3rd biconvex lens, described the first packing ring is for fixing the relative position between the first meniscus lens and the 3rd biconvex lens;
Be arranged at the second packing ring between the second biconcave lens and the 4th biconvex lens, described the second packing ring is for fixing the relative position between the second biconcave lens and the 4th biconvex lens.
5. according to the zoom lens described in the arbitrary claim of claim 1-4, it is characterized in that, the Abbe coefficient of described the second biconcave lens is greater than 55, and refractive index is greater than 1.58; The Abbe coefficient of the 4th biconvex lens is greater than 60, and refractive index is greater than 1.6.
6. zoom lens according to claim 5, is characterized in that,
Between focal distance f ' 2 of the focal distance f of zoom group ' 1 and focus groups, meet: f ' 1>f ' 2;
Zoom lens is in the focal distance f of telescope end the focal distance f of wide-angle side ' T and the zoom lens ' meets between W:
2.5<f’T/f’W<3.2；
The focal distance f of zoom group ' 1 and zoom lens are in the focal distance f of wide-angle side ' meet between W:
2.15<f’1/f’W<2.35；
The displacement dd1 of zoom lens zoom group during from wide-angle side to telescope end zoom, zoom lens are in the focal distance f of telescope end the focal distance f of wide-angle side ' T and the zoom lens ' meets W:
0.5<dd1/(f’T-f’W)<0.7；
The refractive index of the first meniscus lens is greater than 1.8;
When zoom lens is positioned at wide-angle side from the first plano-concave lens towards the summit of thing side to image planes at the distance L W of optical axis direction and zoom lens the focal distance f in wide-angle side ' meet W:
5.5<LW/f’W<5.8；
Rear cut-off distance fbw when zoom lens is positioned at wide-angle side and zoom lens are in the focal distance f of wide-angle side ' meet between W:
0.8<fbw/f’W<1.1。
7. zoom lens according to claim 6, is characterized in that, in described zoom group, the span at the interval of the center of the center of described the first plano-concave lens and described the first biconcave lens on optical axis direction is [1mm, 1.5mm];
In described focus groups, the span at interval on optical axis direction on optical axis direction, center of the center of described the first meniscus lens and described the 3rd biconvex lens is [0.1mm, 0.3mm]; The span at the interval of the center of the center of described the second biconcave lens and the 4th biconvex lens on optical axis direction is [1.05mm, 2.05mm]; The span at the interval of the center of the center of described the 4th biconvex lens and described the second meniscus lens on optical axis direction is [0.1mm, 0.64mm].
8. zoom lens according to claim 6, is characterized in that, in described zoom group, the center of the center of described the first plano-concave lens and described the first biconcave lens is spaced apart 1.25mm on optical axis direction;
In described focus groups, the center of the center of described the first meniscus lens and described the 3rd biconvex lens is spaced apart 0.1mm on optical axis direction on optical axis direction, the center of the center of described the second biconcave lens and the 4th biconvex lens is spaced apart 1.55mm on optical axis direction, and the center of the center of described the 4th biconvex lens and described the second meniscus lens is spaced apart 0.34mm on optical axis direction.
9. zoom lens according to claim 8, is characterized in that, described zoom lens also comprises motor driver, zoom gear group and linkage, and wherein, described zoom group and described focus groups are arranged in described linkage,
Described motor driver is connected with described zoom gear group, drives described zoom gear group to rotate;
Described zoom gear group drags described linkage motion while rotation, the motion of described linkage drives described zoom group and the described focus groups synchronizing moving of described linkage inside.
10. an image capture device, is characterized in that, comprises the zoom lens as described in claim as arbitrary in claim 1-9.
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| CN201420462752.5U CN204009212U (en) | 2014-08-15 | 2014-08-15 | A kind of zoom lens and a kind of image capture device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105334605A (en) * | 2014-08-15 | 2016-02-17 | 浙江大华技术股份有限公司 | Zooming lens and image acquisition equipment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105334605A (en) * | 2014-08-15 | 2016-02-17 | 浙江大华技术股份有限公司 | Zooming lens and image acquisition equipment |
| CN105334605B (en) * | 2014-08-15 | 2018-02-16 | 浙江大华技术股份有限公司 | A kind of zoom lens and a kind of image capture device |
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