CN106125273A - A kind of zoom lens - Google Patents
A kind of zoom lens Download PDFInfo
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- CN106125273A CN106125273A CN201610571492.9A CN201610571492A CN106125273A CN 106125273 A CN106125273 A CN 106125273A CN 201610571492 A CN201610571492 A CN 201610571492A CN 106125273 A CN106125273 A CN 106125273A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/16—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group
- G02B15/163—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group
- G02B15/167—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group having an additional fixed front lens or group of lenses
- G02B15/173—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group having an additional fixed front lens or group of lenses arranged +-+
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/0025—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for optical correction, e.g. distorsion, aberration
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- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Nonlinear Science (AREA)
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Abstract
A kind of zoom lens, the first eyeglass group G1 including having positive light coke the most successively, the second eyeglass group G2 with negative power, has the 3rd eyeglass group G3 of positive light coke, has the 4th eyeglass group G4 of positive light coke, has the 5th eyeglass group G5 of positive light coke；First positive eyeglass group, the 3rd eyeglass group and the 5th positive eyeglass group are group of stability；It is zoom group the second negative eyeglass group；4th positive eyeglass group is for focusing on group；Between the second lens group G2 and the 3rd lens group G3, it is configured with the aperture diaphragm STP specifying set bore；Between the 5th lens group G5 and imaging surface IMG, it is configured with the first optical filter ICF, the second optical filter LPF；At imaging surface IMG, it is configured with the light receiving surface of solid-state imager；By making mobile second eyeglass carry out from wide-angle side to the zoom of telescope end, by making the 4th eyeglass group move along optical axis, carry out correction and the focusing of the image planes variation with zoom.
Description
Technical field
The present invention relates to monitoring, technical field of security and protection, be specifically related to a kind of big multiplying power, omnidistance infrared confocal varifocal mirror
Head.
Background technology
CCTV camera is used in the quasi-video camera in terms of security protection, and from external form, main region is divided into gun-type, hemisphere, clipping the ball
Type, the most also simulation monitoring and the differentiation of IP network monitoring.CCTV camera is widely used in school, company, bank, friendship
Multiple security fields such as logical, safe city.Although pixel and resolution at past CCTV camera are wanted than the video heads of computer
Height, but compared with the digital camera of specialty or dv, its pixel or on the low side.Along with constantly sending out of image optics designing technique
Exhibition, CCTV camera caught up with and surpassed special digital camera, enter the epoch of mega pixel.Traditional CCTV camera is the most only
Being single video capturing device, seldom possess data and preserve function, this can not meet people for monitoring device intelligence
Change and the demand of automatization.
In CCTV camera, the part of most critical is camera lens therein.In order to meet monitoring camera function closely and far
All energy blur-free imaging, zoom lens of need to arranging in pairs or groups uses during distance detection.The zoom lens of CCTV camera at present, at profile chi
Very little, cost, image quality, auto-focusing, many restrictions affecting lens quality such as infrared confocal, zoom ratio, effective focal length
Factor aspect tends not to accomplish to take into account.The most existing zoom lens, most zoom ratio is less than 20 times, it is impossible to meet as far as number
The remote monitor of kilometer；And the CCTV camera that zoom ratio is more than 20 times, mostly cannot be infrared confocal, satisfied day and night dual-purpose
Demand；The camera lens that can reach 1700mm equivalent focal length cannot use greatly stepper motor automatically to focus on because of overall dimensions；Can be
The infrared confocal camera lens of wide-angle side cannot be infrared confocal etc. at telescope end.
Monitoring camera lens design scheme proposed by the invention seek to take into account overall dimensions, cost, image quality, from
Many restraining factors affecting lens quality such as dynamic focusing, infrared confocal, zoom ratio, effective focal length, are ensureing mega pixel
In the case of full HD 1080P image quality, it is achieved long effective focal length, big zoom ratio, and omnidistance infrared confocal, auto-focusing,
Type minifier area of bed simultaneously, it is achieved camera lens miniaturization, reduction cost.
1. cannot accomplish miniaturization, cannot realize automatically focusing on
Owing to the design difficulty of zoom lens is relatively big, in order to obtain preferable resolution, improve image quality as far as possible,
The camera lens generally requiring multiple group is fitted to each other, and whole zoom lens may comprise the eyeglass of tens 20, which results in
The total length of camera lens is typically at about 200mm.Although the most external producer like product structure is reliable, the most bulky, easily
Two or three kilogram, it is only used for large-scale The Cloud Terrace.Owing to the length of camera lens and the volume of monitoring camera are excessive, it is impossible to use stepping horse
Reach, d.c. motor can only be used to be driven.Traditional d.c. motor only has two pins, and the both positive and negative polarity of battery is connected on two
Pin is upper, and motor will rotate.But this motor has has rotating speed too fast, and torsion is too small, it is impossible to accurately measure angle of rotation
The shortcomings such as degree.After installing to be driven on camera lens by this kind of d.c. motor, because motor cannot accurate strips index glass head group location
Complete focusing task, until focus overlaps with sensor, just can only complete to gather by camera lens group gradually being adjusted manually
Burnt process.
2. cannot be omnidistance infrared confocal
The emphasis of at present security protection and difficult point are monitoring in night, industry generally night use infrared lamp as secondary light source,
Require that optical lens visible ray by day and infrared light at night can see clearly, in order to reach this requirement, it is necessary to overcome
The problem of optical lens infrared out of focus at night.Owing to glass exists dispersion phenomenon, i.e. the light of different wave length has different refractions
Rate, which results in camera lens it is difficult to ensure that keep consistent Jiao to put down from visible ray (400～700nm) to infrared light (about 850nm)
Face, here it is infrared out of focus.Can produce focal plane skew when monitoring camera receives infrared light supply at night, therefore sensor connects
The image received is fuzzy, and the parsing power of camera lens is deteriorated, so that quality monitoring declines, also can lead when infrared out of focus is serious
Cause monitoring cannot be smoothed out.
The monitoring camera provided in the market is all known as the requirement meeting day and night with IR correcting function, but these
Camera lens often exists and just fogs evening or definition declines phenomenon and the behavior of empty mark lens parameters.It addition, it is existing
All zoom lens, all cannot accomplish that each multiplying power all ensures infrared confocal when wide-angle side to telescope end zoom.Because along with
The increase of focal length, it is seen that the imaging surface difference of light and infrared light can be increasing.Therefore at telescope end, particularly focal length reaches
During the long-focus of more than 200mm, accomplishing that infrared confocal difficulty is great, this will make the monitoring camera cannot be clear at night
Monitoring distant objects.
3. equivalent focal length is short, zoom ratio is low
One complete monitoring camera not only contains optical glass, also contains receive light sensor (CCD or
CMOS), being differently sized of different lens sensors, even the camera lens of same focal length, on the different size sensor,
The angle of visual field of its imaging is the most different.So only with the true focal length of camera lens, being the actual photographed model that cannot compare different camera lens
Enclose the i.e. angle of visual field, it is desirable to have a reference standard, the focal length of camera lens is had a unified mark, between so different camera lenses
Just there is comparability.Current widely used 35mm camera as reference standard because the 35mm camera past be most, it makes
Using 135 films, a size of 36mmx24mm, catercorner length is 43.27mm.The imaging formed in different lens sensors is regarded
Rink corner, is converted on 35mm camera same lens focus corresponding to imaged viewing angle, and the focal length after this converts is exactly 35mm phase
Machine equivalent focal length, referred to as equivalent focal length.The computing formula of equivalent focal length is that f equivalence=(SA/SB) f is actual.Wherein SA and SB
It is 35mm camera and the sensor diagonal length needing to calculate camera lens respectively.
Simultaneously in order to meet monitoring camera can closely with remote monitor time all can blur-free imaging, varifocal mirror of need to arranging in pairs or groups
Head uses.Zoom lens is can to convert focal length within the specific limits thus obtains the angle of visual field of different width, different size of
Video and the camera gun of different scenery scope.Zoom lens, can be by variation in the case of not changing shooting distance
Focal length changes coverage.Owing to a zoom lens can double be born the responsibility the effect of several tight shots, therefore can subtract
The quantity of few CCTV camera, saves installation cost.
The factors such as real focal length when traditional zoom lens is limited to size sensor and designs, tend not to accomplish
The biggest effective focal length, this makes camera lens when monitoring, it is impossible to see object remotely clearly.The most existing zoom lens, greatly
Many zoom ratios are less than 20 times, it is impossible to meet the remote monitor as far as several kilometers；And the CCTV camera that zoom ratio is more than 20 times,
Mostly cannot meet the demand of day and night dual-purpose, and image quality is poor, it is impossible to all remain high optical in each zoom position
Energy.
Zoom lens described in patent documentation 1 (103336355A), although can meet the demand of day and night dual-purpose, but zoom
Ratio only about 3 times, therefore areas imaging is limited, it is impossible to meet the remote monitor as far as several kilometers.
Zoom lens described in patent documentation 2 (publication number 103293646A), although zoom ratio is 30 times, but telescope end
Focal length only has 129mm, the most also can not meet remote monitoring demand.It addition, this patent cannot be accomplished infrared confocal, in room
In the case of UV light is dark cannot blur-free imaging, therefore can not meet the demand of day and night dual-purpose.
Summary of the invention
The invention solves the problems that above-mentioned the deficiencies in the prior art, it is provided that one meets when wide-angle side to telescope end zoom each
Individual multiplying power all ensures infrared confocal, and all maintains the zoom lens of high optical property in each zoom position.
Because the defect that above-mentioned existing zoom lens exists, the present invention enriches for many years based on this type of product design manufacture
Practical experience and Professional knowledge, and coordinate the utilization of scientific principle, research and innovation the most in addition, to founding a kind of new structure
Zoom lens, it is possible to improve general existing zoom lens so that it is have more practicality.Through constantly research, design, and warp
Cross after repeatedly studying sample and improving, finally create the new solution having practical value.
To achieve these goals, the technical solution used in the present invention is:
A kind of zoom lens, includes having the first eyeglass group G1 of positive light coke, have negative light the most successively
Second eyeglass group G2 of focal power, there is the 3rd eyeglass group G3 of positive light coke, there is the 4th eyeglass group G4 of positive light coke, have
5th eyeglass group G5 of positive light coke.Described first positive eyeglass group, described 3rd eyeglass group and the described 5th positive eyeglass group are solid
Grouping.It is zoom group described second negative eyeglass group.Described 4th positive eyeglass group is for focusing on group.At the second lens group G2 and the 3rd
Between lens group G3, it is configured with the aperture diaphragm STP specifying set bore.It addition, at the 5th lens group G5 and imaging surface
Between IMG, it is configured with a piece of protection glass CG and the first optical filter ICF, the second optical filter LPF.Protection glass CG can be according to need
Configure and can omit when not needed.The effect of optical filter ICF, LPF is to filter veiling glare.In imaging surface IMG, configuration
There is the light receiving surface of the solid-state imager of CCD and CMOS etc..
When making described first eyeglass group, described 3rd eyeglass group and described 5th eyeglass group fix, by making
Described second eyeglass group moves from the lateral image side of object along optical axis and carries out from wide-angle side to the zoom of telescope end, by making
State the 4th eyeglass group to move along optical axis, carry out correction and the focusing of the image planes variation with zoom.
Above-mentioned zoom lens, it is characterised in that: the first eyeglass group G1 of described camera lens includes from object side in order by joining
Put, the cemented doublet L1 with positive light coke, the eyeglass L2 with positive light coke, there is the cemented doublet L3 group of negative power
Become.Such first eyeglass group structure because there being the glued eyeglass of two positive negative powers, arrange in pairs or groups rational lens index and
Abbe number, compared to traditional zoom camera lens in the design of first eyeglass group's only one of which balsaming lens, it is possible to more efficiently subtract
The aberration of little optical system, the infrared confocal realization for camera lens provides technical support.
Particularly, the first eyeglass group meets following conditional:
(1)Vd11>75
(2)Vd2>70
(3)Vd32>65
Wherein Vd11 represents the Abbe number of cemented doublet L1 front lens, and Vd2 represents the Abbe number of eyeglass L2, and Vd32 represents glue
Close the Abbe number of eyeglass L3 rear lens.
Preferably, above-mentioned zoom lens, it is characterised in that: the second eyeglass group G2 of described camera lens includes from object in order
Side by configuration, the eyeglass L4 with negative power, the cemented doublet L5 with negative power, has the eyeglass L6 of negative power
Composition.Such second eyeglass group's G2 structure, arrange in pairs or groups rational lens index and Abbe number, it is possible to can effectively reduce optics
System telescope end and the various aberrations of wide-angle side.The effect of the second eyeglass group G2 is to zoom in or out multiplying power: as the second eyeglass group
G2 along optical axis move from the lateral image side of object time, camera lens realize from wide-angle side to the zoom process of telescope end；Otherwise, the second mirror
Sheet group G2 along optical axis from image side to object side move time, camera lens realize from telescope end to the zoom process of wide-angle side.
Particularly, the second eyeglass group G2 meets following conditional:
(4)Vd910>45
(5)Nd1112>1.9
(6)Vd1213>50
Wherein Vd910 represents the Abbe number of eyeglass L4, and Nd1112 represents the refractive index of cemented doublet L5 front lens, Vd1213
Represent the Abbe number of cemented doublet L5 rear lens.
Preferably, above-mentioned zoom lens, it is characterised in that: the 3rd eyeglass group G3 of described camera lens includes from object in order
Side, by configuration, has positive light coke and two sides is aspheric eyeglass L7, has the eyeglass L8 composition of negative power.This
3rd eyeglass group's G3 structure of sample, arrange in pairs or groups rational lens index and Abbe number and asphericity coefficient, it is possible to can be effectively
Reduce the various aberrations of optical system, especially spherical aberration, astigmatism and the curvature of field.
Particularly, the 3rd eyeglass group G3 meets following conditional:
(7)Vd1718>55
(8)Nd1920>1.9
Wherein Vd1718 represents the Abbe number of eyeglass L7, and Nd1920 represents the refractive index of eyeglass L8.
Preferably, above-mentioned zoom lens, it is characterised in that: the positive eyeglass group G4 of the 4th of described camera lens includes from object by suitable
Sequence side, by configuration, has positive light coke and first and forms for aspheric cemented doublet L9.Such 4th eyeglass group G4
Structure, arrange in pairs or groups rational lens index and Abbe number and asphericity coefficient, it is possible to can effectively reduce each of optical system
Plant aberration, especially spherical aberration, coma.The effect of the 4th eyeglass group G4 is to focus on: when object distance changes, along optical axis direction adjustment the
The position of four eyeglass group G4, it is possible to achieve camera lens focusing under difference zooms in or out multiplying power.
Particularly, the 4th eyeglass group G4 meets following conditional:
(9)Vd2223>70
Wherein Vd2223 represents the Abbe number of cemented doublet L9 rear lens.
Above-mentioned zoom lens, it is characterised in that: the positive eyeglass group G5 of the 5th of described camera lens include from object side in order by
Configuration, the eyeglass L10 with negative power and the eyeglass L11 with positive light coke composition.Such 5th eyeglass group G5 knot
Structure, arrange in pairs or groups rational lens index and Abbe number and asphericity coefficient, it is possible to can effectively reduce optical system wide-angle side
Various aberrations, especially distort.
As described above, the zoom lens of the present invention, by possessing above-mentioned composition, miniaturization, wide angle can be reached, long have
Effect focal length, high zoom multiplying power, infrared confocal various features, and cross over whole zoom territory and all can correct all aberrations, energy well
Enough correspondences can be to carry out the solid-state imager of the photography of full HD mode.Especially by meeting above-mentioned each conditional, permissible
Miniaturization, wide angle, long effective focal length, high zoom multiplying power, infrared confocal and high optical property maintenance is made to exist side by side.
The advantage of the invention is as follows:
1. realize miniaturization, realize automatically focusing on.
Compared with the zoom lens of Neng Deng company of Fuji design, this camera lens, because of the construction features of its miniaturization, can use
Stepper motor is as driving means.In the case of non-overload, the rotating speed of motor, the position of stopping are solely dependent upon pulse signal
Frequency and umber of pulse, and do not changed by load and affected.Pilot angle displacement can be carried out by controlling pulse number, thus reach
The purpose being accurately positioned；Speed and the acceleration of revolution can be controlled simultaneously by controlling pulse frequency, thus reach
The purpose of speed governing.Utilizing the plurality of advantages such as stepper motor high torque (HT), high responsiveness, high de-agglomeration energy, hi-Fix, we are permissible
Accurately control the position of camera lens group, thus realized the automatic focusing of camera lens by corresponding programmed algorithm.Automatically focusing function
Being to realize intellectuality, precision monitors requisite technology requirement.Automatically the realization of focusing function so that at unattended mirror
During head, camera lens still to accident key monitoring, thus can improve supervision efficiency.
Design by improving the optical texture of monitoring camera inner lens group so that camera lens compact overall structure, total length
It is only 138mm, takes the Machine Design of original creation simultaneously, ideally process various transmission details so that camera lens overall weight controls
Within 500 grams, effective problem that must solve temperature drift and burn.In the development trend that monitoring camera head is following,
The miniaturization of camera lens is also a particularly important key element, and the monitoring camera of miniaturization not only achieves focusing automatically, simultaneously
The volume that can also reduce product is installed with the product being applicable to varying environment.
2. realize omnidistance infrared focusing.Infrared confocal design difficulty and focal length size are inversely proportional to, when focal length is the biggest,
Visible ray dispersion is with regard to extremely difficult correction, while visible ray improves correction, is also carried out correction for infrared light, its difficulty can think and
Know.
This camera lens is divided into five groups, have employed the type design of aspheric surface face and reduces dispersion, simultaneously the glass material choosing of camera lens
Taking and also use several special glass, these glass are respectively provided with big Abbe number, the feature of low abbe number.Rely on these to set
Meter, this camera lens achieves wide-angle side and all ensures infrared confocal to each multiplying power during telescope end zoom, and this makes monitoring camera at night
Still can obtain the parsing power same with daytime under the floor light of late infrared light supply, and also can begin in the case of zoom
Keep picture clear eventually, substantially increase the quality of night monitoring.Even if it is under the mal-condition such as haze, dust, excellent by it
Elegant infrared confocal performance, also can photograph clear, the image of high-contrast.
3. equivalent focal length length, zoom ratio height.By the structure of traditional zoom camera lens being innovated and improving, finally set
The camera lens equivalent focal length of meter is 56mm-1750mm, and zoom ratio is 32 times, it may be said that this camera lens is first domestic super remote burnt zoom
Camera lens, has broken the monopolization of overseas producer headed by Japan.And this camera lens is because possessing the equivalent focal length of 1750mm, can realize
The monitoring of 5km scope, is greatly expanded the range of product, is widely used in highway, high ferro along the line etc. remote
The occasion of monitoring.
Accompanying drawing illustrates:
Fig. 1 is the wide-angle side each aberration diagram relative to d line of embodiment 1 camera lens
Fig. 2 is the telescope end each aberration diagram relative to d line of embodiment 1 camera lens
Fig. 3 is the wide-angle side each aberration diagram relative to d line of embodiment 2 camera lens
Fig. 4 is the telescope end each aberration diagram relative to d line of embodiment 2 camera lens
Fig. 5 is the optical schematic diagram of the present invention
Symbol implication in figure:
G1 the first eyeglass group
G2 the second eyeglass group
G3 the 3rd eyeglass group
G4 the 4th eyeglass group
G5 the 5th eyeglass group
L1, L2, L3 first lens
L4, L5, L6 second lens
L7, L8 the 3rd lens
L9 the 4th lens
L10, L11 the 5th lens
STP aperture diaphragm
IMG imaging surface
CG protects glass
ICF the first optical filter
LPF the second optical filter
Detailed description of the invention
Further illustrate the present invention below in conjunction with the accompanying drawings:
Embodiment 1
Referring to the drawings 1,2,5:
Embodiment 1 meets following condition:
EFL=7.5 (W)～126.8 (M)～242 (T)
FNO=1.65 (W)～3.45 (M)～5.1 (T)
A kind of zoom lens, include having the first eyeglass group G1 of positive light coke, have negative light the most successively
Second eyeglass group G2 of focal power, there is the 3rd eyeglass group G3 of positive light coke, there is the 4th eyeglass group G4 of positive light coke, have
5th eyeglass group G5 of positive light coke.
Between the second lens group G2 and the 3rd lens group G3, it is configured with the aperture diaphragm STP specifying set bore.
It addition, between the 5th lens group G5 and imaging surface IMG, be configured with a piece of protection glass CG and the first optical filter ICF, the second filter
Mating plate LPF.Protection glass CG can configure as required and can omit when not needed.First optical filter ICF, the second optical filtering
The effect of sheet LPF is to filter veiling glare.At imaging surface IMG, it is configured with the light-receiving of the solid-state imager of CCD and CMOS etc.
Face.
For the first eyeglass group G1, configure in order from object side and there is the cemented doublet L1 of positive light coke, just have
The eyeglass L2 of focal power, there is the cemented doublet L3 of negative power and form.For the second eyeglass group G2, from object side by suitable
Sequence configuration have negative power eyeglass L4, have negative power cemented doublet L5, have negative power eyeglass L6 composition.
For the 3rd eyeglass group G3, configure in order from object side and there is the eyeglass L7 of double aspheric surface positive light coke, tool
It is made up of the eyeglass L8 of negative power.
For the 4th eyeglass group G4, configure in order from object side and there is positive light coke and first for aspheric glue
Close eyeglass L9 composition.
For the 5th eyeglass group G5, configure in order from object side and there is the eyeglass L10 of negative power and there is positive light
The eyeglass L11 composition of focal power.
When making described first eyeglass group, described 3rd eyeglass group and described 5th eyeglass group fix, by making
Described second eyeglass group moves from the lateral image side of object along optical axis and carries out from wide-angle side to the zoom of telescope end, by making
State the 4th eyeglass group to move along optical axis, carry out correction and the focusing of the image planes variation with zoom.
Below, it is shown that about the various numeric datas of the zoom lens of embodiment 1.
EFL=7.5 (wide-angle side)～126.8 (intermediate focus position)～242 (telescope ends)
F number=1.65 (wide-angle side)～3.45 (intermediate focus positions)～5.1 (telescope ends)
Table 1 shows the structural parameters of embodiment 1 camera lens；Table 2 shows the zoom parameters of embodiment 1 camera lens；Table 3 shows
The camera lens asphericity coefficient of embodiment 1.
Table 1
Embodiment 1 lens construction parameter
Table 2
Embodiment 1 lens zoom parameter
Table 3
Embodiment 1 camera lens asphericity coefficient
Embodiment 2
Referring to the drawings 3,4,5:
Embodiment 2 meets following condition:
EFL=8.1 (wide-angle side)～127.2 (intermediate focus position)～259.3 (telescope ends)
F number=1.71 (wide-angle side)～3.55 (intermediate focus positions)～6.1 (telescope ends)
Table 4
Embodiment 2 lens construction parameter
Table 5
Embodiment 2 lens zoom parameter
Table 6
Embodiment 2 camera lens asphericity coefficient
The remainder of embodiment 2 is same as in Example 1.
Content described in this specification embodiment is only enumerating of the way of realization to inventive concept, the protection of the present invention
Scope is not construed as being only limitted to the concrete form that embodiment is stated, protection scope of the present invention is also and in art technology
Personnel according to present inventive concept it is conceivable that equivalent technologies means.
Claims (6)
1. a zoom lens, includes having the first eyeglass group G1 of positive light coke, have negative light Jiao the most successively
Second eyeglass group G2 of degree, there is the 3rd eyeglass group G3 of positive light coke, there is the 4th eyeglass group G4 of positive light coke, just have
5th eyeglass group G5 of focal power；Described first positive eyeglass group, described 3rd eyeglass group and the described 5th positive eyeglass group are fixing
Group；It is zoom group described second negative eyeglass group；Described 4th positive eyeglass group is for focusing on group；Saturating at the second lens group G2 and the 3rd
Between lens group G3, it is configured with the aperture diaphragm STP specifying set bore；It addition, at the 5th lens group G5 and imaging surface IMG
Between, it is configured with the first optical filter ICF, the second optical filter LPF；At imaging surface IMG, it is configured with the light-receiving of solid-state imager
Face；
When making described first eyeglass group, described 3rd eyeglass group and described 5th eyeglass group fix, described by making
Second eyeglass group moves from the lateral image side of object along optical axis and carries out from wide-angle side to the zoom of telescope end, by making described
Four eyeglass groups move along optical axis, carry out correction and the focusing of the image planes variation with zoom；It is characterized in that:
First eyeglass group G1 of described camera lens includes from object side in order by configuration, has the cemented doublet of positive light coke
L1, have positive light coke eyeglass L2, have negative power cemented doublet L3 composition；
First eyeglass group meets following conditional:
(1)Vd11>75
(2)Vd2>70
(3)Vd32>65
Wherein Vd11 represents the Abbe number of cemented doublet L1 front lens, and Vd2 represents the Abbe number of eyeglass L2, and Vd32 represents glued mirror
The Abbe number of sheet L3 rear lens.
2. a kind of zoom lens as claimed in claim 1, it is characterised in that: the second eyeglass group G2 of described camera lens includes from thing
Body side in order by configuration, eyeglass L4, the cemented doublet L5 with negative power with negative power, has negative power
Eyeglass L6 composition；Such second eyeglass group's G2 structure, arrange in pairs or groups rational lens index and Abbe number, it is possible to can be effectively
Reduce optical system telescope end and the various aberrations of wide-angle side；The effect of the second eyeglass group G2 is to zoom in or out multiplying power: when
Two eyeglass group G2 along optical axis move from the lateral image side of object time, camera lens realize from wide-angle side to the zoom process of telescope end；Instead
It, the second eyeglass group G2 along optical axis from image side to object side move time, camera lens realize from telescope end to the zoom mistake of wide-angle side
Journey；
Second eyeglass group G2 meets following conditional:
(4)Vd910>45
(5)Nd1112>1.9
(6)Vd1213>50
Wherein Vd910 represents the Abbe number of eyeglass L4, and Nd1112 represents the refractive index of cemented doublet L5 front lens, and Vd1213 represents
The Abbe number of cemented doublet L5 rear lens.
3. a kind of zoom lens as claimed in claim 1, it is characterised in that: the 3rd eyeglass group G3 of described camera lens includes from thing
Body side in order, by configuration, has positive light coke and two sides is aspheric eyeglass L7, has the eyeglass of negative power
L8 forms；Such 3rd eyeglass group's G3 structure, arrange in pairs or groups rational lens index and Abbe number and asphericity coefficient, it is possible to
Can effectively reduce the various aberrations of optical system, especially spherical aberration, astigmatism and the curvature of field；
3rd eyeglass group G3 meets following conditional:
(7)Vd1718>55
(8)Nd1920>1.9
Wherein Vd1718 represents the Abbe number of eyeglass L7, and Nd1920 represents the refractive index of eyeglass L8.
4. a kind of zoom lens as claimed in claim 1, it is characterised in that: the positive eyeglass group G4 of the 4th of described camera lens includes certainly
Object side in order, by configuration, has positive light coke and first and forms for aspheric cemented doublet L9；Such 4th
Eyeglass group's G4 structure, arrange in pairs or groups rational lens index and Abbe number and asphericity coefficient, it is possible to can effectively reduce optics
The various aberrations of system, especially spherical aberration, coma；The effect of the 4th eyeglass group G4 is to focus on: when object distance changes, along optical axis side
To the position adjusting the 4th eyeglass group G4, it is possible to achieve camera lens focusing under difference zooms in or out multiplying power；
4th eyeglass group G4 meets following conditional:
(9)Vd2223>70
Wherein Vd2223 represents the Abbe number of cemented doublet L9 rear lens.
5. a kind of zoom lens as claimed in claim 1, it is characterised in that: the positive eyeglass group G5 of the 5th of described camera lens includes certainly
Object side in order is by configuration, the eyeglass L10 with negative power and the eyeglass L11 composition with positive light coke.
6. a kind of zoom lens as described in one of claim 1-5, it is characterised in that: at the 5th lens group G5 and imaging surface
Between IMG, it is configured with a piece of protection glass CG.
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| CN201610571492.9A CN106125273B (en) | 2016-07-19 | 2016-07-19 | A kind of zoom lens |
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| CN106990515A (en) * | 2016-12-16 | 2017-07-28 | 嘉兴中润光学科技有限公司 | A kind of zoom lens |
| CN108594409A (en) * | 2018-05-04 | 2018-09-28 | 中山联合光电科技股份有限公司 | High-resolution, big image planes, low cost, the varifocal optical system without veiling glare |
| CN109116531A (en) * | 2018-09-30 | 2019-01-01 | 浙江大华技术股份有限公司 | A kind of zoom lens |
| WO2019042452A1 (en) * | 2017-09-04 | 2019-03-07 | Zhejiang Dahua Technology Co., Ltd. | Lens system and imaging device |
| CN110941080A (en) * | 2019-11-26 | 2020-03-31 | 中山联合光电科技股份有限公司 | Global high-magnification lens |
| CN112305730A (en) * | 2020-10-21 | 2021-02-02 | 舜宇光学(中山)有限公司 | Zoom lens |
| CN113805323A (en) * | 2021-10-13 | 2021-12-17 | 舜宇光学(中山)有限公司 | Zoom lens |
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| CN103293646A (en) * | 2012-02-28 | 2013-09-11 | 株式会社腾龙 | Zoom lens |
| JP2015084037A (en) * | 2013-10-25 | 2015-04-30 | 株式会社ニコン | Variable power optical system, optical device, and method for manufacturing variable power optical system |
| US20160124199A1 (en) * | 2014-10-29 | 2016-05-05 | Canon Kabushiki Kaisha | Zoom lens and image pickup apparatus including the zoom lens |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106990515A (en) * | 2016-12-16 | 2017-07-28 | 嘉兴中润光学科技有限公司 | A kind of zoom lens |
| CN106990515B (en) * | 2016-12-16 | 2019-06-18 | 嘉兴中润光学科技有限公司 | A kind of zoom lens |
| WO2019042452A1 (en) * | 2017-09-04 | 2019-03-07 | Zhejiang Dahua Technology Co., Ltd. | Lens system and imaging device |
| US11204488B2 (en) | 2017-09-04 | 2021-12-21 | Zhejiang Dahua Technology Co., Ltd. | Lens system and imaging device |
| CN108594409A (en) * | 2018-05-04 | 2018-09-28 | 中山联合光电科技股份有限公司 | High-resolution, big image planes, low cost, the varifocal optical system without veiling glare |
| CN108594409B (en) * | 2018-05-04 | 2023-08-15 | 中山联合光电科技股份有限公司 | High resolution, large image plane, low cost, no stray light zoom optical system |
| CN109116531A (en) * | 2018-09-30 | 2019-01-01 | 浙江大华技术股份有限公司 | A kind of zoom lens |
| US12117597B2 (en) | 2018-09-30 | 2024-10-15 | Zhejiang Dahua Technology Co., Ltd. | Zoom lens and optical device having the same |
| CN110941080A (en) * | 2019-11-26 | 2020-03-31 | 中山联合光电科技股份有限公司 | Global high-magnification lens |
| CN112305730A (en) * | 2020-10-21 | 2021-02-02 | 舜宇光学(中山)有限公司 | Zoom lens |
| CN113805323A (en) * | 2021-10-13 | 2021-12-17 | 舜宇光学(中山)有限公司 | Zoom lens |
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