CN106066530B - Zoom lens and photographic device - Google Patents
Zoom lens and photographic device Download PDFInfo
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- CN106066530B CN106066530B CN201610248303.4A CN201610248303A CN106066530B CN 106066530 B CN106066530 B CN 106066530B CN 201610248303 A CN201610248303 A CN 201610248303A CN 106066530 B CN106066530 B CN 106066530B
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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
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Abstract
The purpose of the present invention is to provide a kind of to have the miniature zoom lens and photographic device of favorable optical performance with high zoom ratios and in entire zooming range.To achieve the goals above, the zoom lens is made of the first lens group G1, the second lens group G2, the third lens group G3, the 4th lens group G4, the 5th lens group G5 and the 6th lens group G6 configured in order from object side, wherein, 5th lens group G5 has negative refracting power, the zoom from wide-angle side to telescope end is carried out by least making the 5th lens group G5 mobile, and meets specified conditional.
Description
Technical field
The present invention relates to optical system and photographic devices, in particular to are suitable for making for digital camera and digital code camera etc.
With the zoom lens in the photographic device of solid-state imager and has the photographic device of the zoom lens.
Background technique
All the time, digital camera, digital code camera etc. to have used the photographic device of solid-state imager to obtain general
And.These photographic devices are used in the various purposes such as monitoring photographic device.In recent years, with the high score of solid-state imager
The development of resolution, the high performance zoom ratio for corresponding to the full HD system of the fine feature of confirmation subject are high
Miniature zoom lens are pursued by people.
As such zoom lens, all the time it is well known that four groups of formula structures zoom lens (for example, referring to
" patent document 1 ".).Zoom lens described in Patent Document 1 have configured in order from object side it is positive and negative, just, positive first
~the four lens group, and under the premise of fixed first lens group and the third lens group, by making the second lens group along optical axis side
Zoom is carried out to moving in one direction.In addition, by moving the 4th lens group in the longitudinal direction along optical axis direction,
It is corrected and focuses to what the image planes generated with zoom changed.The zoom lens of such four groups of formula structures can be entire
Zooming range realizes high imaging performance.The zoom lens described in Patent Document 1 realizes the zoom ratio of 25 times of sizes.
In recent years, in order to seek the zoom lens with more high zoom ratios, the zoom lens of five groups of formula structures is proposed
Scheme is (for example, referring to " patent document 2 " and " patent document 3 ".).For example, patent document 2 and described in Patent Document 3
Zoom lens, which just has, has such as added fixed group of structure in the image side of the zoom lens of above-mentioned four groups of formula structures.That is, at this
In a little zoom lens, there is the first lens group~the 5th lens group positive and negative, just, positive and negative configured in order from object side,
Under the premise of fixed first lens group, the third lens group and the 5th lens group, by making the second lens group along optical axis direction one
A side is moved upward to carry out zoom, and by moving the 4th lens group in the longitudinal direction along optical axis direction come to change
The image planes variation that coke generates is corrected and focuses.The size that the zoom ratio of zoom lens described in Patent Document 2 is 35 times,
The size that the zoom ratio of zoom lens described in Patent Document 3 is 30 times, it is real compared with zoom lens described in Patent Document 1
Higher zoom ratio is showed.
Existing technical literature
Patent document patent document 1：Japanese Patent No. 4672860
Patent document 2：Japanese Patent No. 4823680
Patent document 3：Japanese Unexamined Patent Publication 2013-178409 bulletin
Summary of the invention
Problems to be solved by the invention
However, in the zoom lens documented by patent document 2, although higher zoom ratio is realized, due to adjoint
The aberration that zoom generates changes big, it is difficult to realize good optical property in entire zooming range.On the other hand, in patent document
In zoom lens documented by 3, is inhibited although being changed with the aberration that zoom generates, realized in entire zooming range
Good optical property, but compared with zoom lens documented by patent document 2, zoom ratio is low.
It is good optical the object of the present invention is to provide having with high zoom ratios and in entire zooming range
The miniature zoom lens of energy.
The method for solving problem
To achieve the goals above, the invention discloses a kind of zoom lens, which is characterized in that by successively matching from object side
The first lens group, the second lens group, the third lens group, the 4th lens group, the 5th lens group and the 6th lens group institute structure set
There is negative refracting power at, the 5th lens group, carried out by least making the 5th lens group mobile from wide-angle side to looking in the distance
The zoom at end, and meet conditional below (1).
(1) 4.0 < β 5T < 6.0
Wherein,
The horizontal magnification multiplying power of the 5th lens group when β 5T is in telescope end.
The invention also discloses a kind of photographic devices, which is characterized in that in the image side of the zoom lens configured with will be by
The optical imagery that the zoom lens is formed is transformed to the photographing element of electric signal.
The effect of invention
According to the present invention, it can provide with high zoom ratios and there is the small of good optical property in entire zooming range
Type zoom lens.
Detailed description of the invention
Fig. 1 is the sectional view for indicating the lens configuration example of the zoom lens of the embodiment of the present invention 1.
Fig. 2 is spherical aberration diagram, the astigmatism when infinity that the zoom lens of embodiment 1 is under wide-angle side state is focused
Figure and distortion aberration diagram.
Fig. 3 be the zoom lens of embodiment 1 be under middle focal length state infinity focusing when spherical aberration diagram, as
It dissipates figure and distorts aberration diagram.
Fig. 4 is spherical aberration diagram, the astigmatism when infinity that the zoom lens of embodiment 1 is under telescope end state is focused
Figure and distortion aberration diagram.
Fig. 5 is the sectional view for indicating the lens configuration example of the zoom lens of the embodiment of the present invention 2.
Fig. 6 is spherical aberration diagram, the astigmatism when infinity that the zoom lens of embodiment 2 is under wide-angle side state is focused
Figure and distortion aberration diagram.
Fig. 7 be the zoom lens of embodiment 2 be under middle focal length state infinity focusing when spherical aberration diagram, as
It dissipates figure and distorts aberration diagram.
Fig. 8 is spherical aberration diagram, the astigmatism when infinity that the zoom lens of embodiment 2 is under telescope end state is focused
Figure and distortion aberration diagram.
Fig. 9 is the sectional view for indicating the lens configuration example of the zoom lens of the embodiment of the present invention 3.
Figure 10 be the zoom lens of embodiment 3 be under wide-angle side state infinity focusing when spherical aberration diagram, as
It dissipates figure and distorts aberration diagram.
Figure 11 be the zoom lens of embodiment 3 be under middle focal length state infinity focusing when spherical aberration diagram,
Astigmatism figure and distortion aberration diagram.
Figure 12 be the zoom lens of embodiment 3 be under telescope end state infinity focusing when spherical aberration diagram, as
It dissipates figure and distorts aberration diagram.
Figure 13 is the sectional view for indicating the lens configuration example of the zoom lens of the embodiment of the present invention 4.
Figure 14 be the zoom lens of embodiment 4 be under wide-angle side state infinity focusing when spherical aberration diagram, as
It dissipates figure and distorts aberration diagram.
Figure 15 be the zoom lens of embodiment 4 be under middle focal length state infinity focusing when spherical aberration diagram,
Astigmatism figure and distortion aberration diagram.
Figure 16 be the zoom lens of embodiment 4 be under telescope end state infinity focusing when spherical aberration diagram, as
It dissipates figure and distorts aberration diagram.
Symbol description
The first lens group of G1 ...
The second lens group of G2 ...
G3 ... the third lens group
The 4th lens group of G4 ...
The 5th lens group of G5 ...
The 6th lens group of G6 ...
VC ... stabilization group
S ... aperture
CG ... cover glass
Specific embodiment
Hereinafter, being illustrated to the embodiment of zoom lens disclosed in this invention and photographic device.
1. zoom lens
The composition of 1-1. optical system
The zoom lens of the present embodiment, which is characterized in that by configured in order from object side the first lens group, the second lens
Group, the third lens group, the 4th lens group, the 5th lens group and the 6th lens group are constituted, and the 5th lens group has negative
Refracting power carries out the zoom from wide-angle side to telescope end by least making the 5th lens group mobile, and meets aftermentioned item
Part formula (1).
In the zoom lens of the present embodiment, while using above-mentioned six groups of formula structures, by meeting aftermentioned condition
Formula (1), and by changing the interval (airspace) between each lens group, so as to obtain with high zoom ratios and entire
Zooming range has the miniature zoom lens of good optical property.In addition, movement and item when about zoom and when focusing
The item of part formula describes after holding.
In the zoom lens of the present embodiment, as long as the refracting power of the 5th lens group is negative, the refractive power of other lenses group
Power is just not particularly limited, and can be used according to requirements such as zoom lens zoom ratio, the optical properties is suitable for that appropriate refracting power is matched
It sets.Hereinafter, the composition etc. to each lens group is illustrated.
(1) first lens group and the second lens group
In the zoom lens of the present embodiment, the refracting power of the first lens group and the second lens group is unlimited, each lens
The specific lens composition of group is also not particularly limited.For example, if using first lens group as the lens group of positive refracting power,
Lens group of second lens group as negative refracting power, then zoom ratio easy to accomplish it is big, in telescope end when the long varifocal mirror of focal length
Head.At the same time, the overall length that can inhibit zoom lens entirety becomes larger, and is easy to get miniature zoom lens.
For example, first lens group, which can be, to be had from object side when the first lens group is positive the lens group of refracting power
The cemented lens obtained by a negative lens and the engagement of positive lens that configures in order and at least one positive simple lens
It constitutes.By such composition, the correction of the spherical aberration in telescope end will become easy, and especially can be further improved and look in the distance
The optical property at end.
In addition, when the second lens group is negative the lens group of refracting power, preferably containing the composition of at least one positive lens.
By such composition, chromatic aberration correction etc. can be carried out, well so as to obtain the higher zoom lens of optical property.
(2) the third lens group and the 4th lens group
In the zoom lens of the present embodiment, the refracting power of the third lens group and the 4th lens group is not particularly limited,
The specific lens composition of each lens group is also not particularly limited.For example, if by the third lens group and the 4th lens component
Lens group not all as positive refracting power, then to spherical aberration, coma aberration and curvature of the image in entire zooming range
Correction will become easy, to be easier to realize good optical property.
For example, preferably at least contain a positive lens when using the third lens group as when the lens group of positive refracting power, and
At least one side of the positive lens is aspherical composition.At this point, also can entirely become even if the zoom lens high as zoom ratio
The correction of spherical aberration and coma aberration is carried out in burnt range well.
In addition, when using the third lens group as when the lens group of positive refracting power, it also may be preferable at least contain a negative lens
Composition.For example, can be realized by constituting the third lens group with a positive lens and a negative lens with the few lens of number
High-resolution zoom lens can seek the miniaturization of zoom lens, lightweight and cost effective.Wherein, when with one just
Lens and a negative lens are come when constituting the third lens group, based on the above reasons, at least one side of the more preferable positive lens is non-
Spherical surface.
(3) the 5th lens groups
5th lens group is that have the lens group of negative refracting power, as long as meeting aftermentioned conditional (1), specific lens
Composition is just not particularly limited.Wherein, by constituting the 5th lens group with a negative lens, it is able to achieve the small of the zoom lens
Type and lightweight.
(4) the 6th lens groups
The refracting power and specific lens of 6th lens group be constructed without and be particularly limited to, but from realizing the zoom lens
From the point of view of in terms of miniaturization, the 6th lens group preferably has positive refracting power.By making to be configured at the lens group near image planes side
Refracting power is positive, so as to shorten back focal length from the overall length of reduction zoom lens entirety.In addition, the 6th lens group is preferably by one
A lens are constituted.By such composition, it can be achieved that the miniaturization and lightweight of the zoom lens.
(5) aperture
In zoom lens of the invention, the configuration of aperture is not particularly limited.No matter aperture is configured in the zoom lens
Which kind of interior position, can obtain optical effect of the invention.In addition, the aperture can be fixed relative to image planes, it is possible to use can
Mobile composition.However, in order to seek radial miniaturization while realizing the heavy caliber of the zoom lens, preferably the
The object side of three lens groups configures aperture.
Movement when 1-2. zoom
Secondly, being illustrated to the movement of the zoom lens of the present embodiment when zooming.In the zoom lens, when from wide
When angle end is to telescope end zoom, the 5th lens group with negative refracting power can be made mobile.It can inhibit as a result, with zoom generation
Imaging position variation also can realize good optics in entire zooming range when the camera lens is the high zoom lens of zoom ratio
Performance.
In the zoom lens of the present embodiment, when zoom, the specific movement of each lens group other than the 5th lens group does not have
It is particularly limited to.However, from realize the object of the invention in terms of, it is each preferably when from wide-angle side to telescope end zoom
The movement of microscope group is as follows.
(1) first lens group
The preferably fixed group of first lens group.In zoom lens, it is generally the case that with the lens for constituting other lenses group
It compares, constitutes the outer diameter of the lens of the first lens group greatly and again.Therefore, by making the fixed group of the first lens group, it is able to achieve use
The miniaturization of mobile group of mobile driving device driven etc. when to zoom.In addition, by keeping the first lens group solid
Determine group, the movement of position of centre of gravity when can prevent zoom.It in turn, can be in the unconverted situation of overall length of zoom lens entirety
Under, simplify lens barrel and constitutes.Wherein, the overall length of zoom lens entirety refers to, in the first lens group, configures near object side
Lens object plane and image planes between, distance on optical axis.
(2) second lens groups
When from wide-angle side to telescope end zoom, the second lens group is preferably between the first lens group and the second lens group
Every becoming larger, the mode that the interval of the second lens group and the third lens group becomes smaller is moved.By keeping the second lens group mobile,
To be easy to get the zoom lens of high zoom ratios.
(3) the third lens group
The third lens group is fixed on the fixation group of optical axis direction when can be zoom, be also possible to move along optical axis direction
Mobile group.However, based on the viewpoint for the zoom lens that zoom ratio is higher, optical property is high is obtained, the third lens group is preferably moved
Dynamic group.When zoom, by moving together the third lens group with the second lens group, the second lens group and the third lens component can be allowed
Carry on a shoulder pole zoom effect.As a result, compared with the case where only allowing the second lens group to undertake zoom effect, the aberration that is generated when can inhibit zoom
It changes.Therefore, aberration correction can be carried out well with the lens of few number, high-resolution zoom lens can be constituted, i.e.,
It can the miniaturization ground composition higher zoom lens of optical property.
In addition, when using the third lens group as when mobile group, when from wide-angle side to telescope end zoom, preferably make third saturating
Microscope group is moved in a manner of describing the track recessed to image side.When zoom, by moving the third lens group in this way, it can inhibit
The imaging position variation generated when with zoom, can obtain the zoom lens in entire zooming range high resolution.
(4) the 4th lens groups
4th lens group can be mobile group and fix any one in group, but preferably mobile group.When zoom, lead to
Crossing keeps the 4th lens group mobile, so as to the imaging position variation generated when inhibiting with zoom, can obtain in entire zoom model
Enclose the zoom lens of high resolution.
In addition, when using the 4th lens group as when mobile group, preferred being spaced in the third lens group and the 4th lens group
Become smaller when from wide-angle side to middle focal length zoom, the mode to become larger when from middle focal length to telescope end zoom makes the 4th lens
Group is relatively moved relative to the third lens group.When zoom, by becoming the third lens group and the interval of the 4th lens group in this way
Change, it is suppressed that the imaging position variation generated when with zoom, so as to obtain the zoom in entire zooming range high resolution
Camera lens.At this point, the viewpoint based on the imaging position variation generated when preferably inhibiting with zoom, when from wide-angle side to telescope end
When zoom, make the third lens group and the 4th lens group respectively with different tracks, preferably to describe to the recessed track in image side
Mode is mobile.
(5) the 6th lens groups
The preferably fixed group of 6th lens group.By making the fixed group of the 6th lens group, can simplify for moving mobile group
The composition of dynamic above-mentioned driving device.In addition, by making the first lens group and the fixed group of the 6th lens group, to be easy to make
Lens barrel becomes closed structure, can prevent water or dust from entering in lens barrel.
(6) aperture
As described above, aperture can be fixed relative to image planes, it is possible to use moveable to constitute.However, when aperture configuration exists
When the object side of the third lens group, in the case where making the third lens group mobile when zooming, preferably make aperture and the third lens group
It moves as a whole.As a result, as described above, can seek radial while realizing the heavy caliber of the zoom lens
Miniaturization.
Movement when 1-3. focuses
In the zoom lens, focus group is not particularly limited, but preferably using the 4th lens group as focus group.In this implementation
Example zoom lens composition in, the 4th lens group can be constituted with the lesser lens of outer diameter, at this time, it can be achieved that focus group it is small
Type and lightweight, make it possible rapid focus.In addition, focus group when the above-mentioned composition due to focus group can reduce focusing
Amount of movement, therefore can realize the miniaturization of the overall length of zoom lens entirety.
Movement when 1-4. stabilization
The zoom lens can have so-called stabilization group.Herein, stabilization group refers to, by with can be substantially vertical with optical axis
On direction move mode constitute, lens group composed by one or more lens.By making stabilization group substantially hang down with optical axis
Moved on straight direction, so as to make as with moved in optical axis generally perpendicular direction.It can be corrected as a result, because hand shaking etc. images
When shake bring image blur.
It, can be using any one group of lens group as stabilization group in the lens group for constituting the zoom lens.Alternatively, it is also possible to
A part of any one group of lens group of the zoom lens will be constituted as stabilization group.For example, by using the second lens group as
Stabilization group can reduce the amount of movement of stabilization group when the image blur that shake generates when to above-mentioned camera shooting is corrected.
1-5. conditional
Secondly, being illustrated to each conditional.As described above, the zoom lens, which is characterized in that using above-mentioned composition
While, meet following conditionals (1).
(1) 4.0 < β 5T < 6.0
Wherein,
The horizontal magnification multiplying power of 5th lens group described in when β 5T is in telescope end.
1-5-1. conditional (1)
Conditional (1) is the horizontal magnification multiplying power formula for providing the 5th lens group and being visible under farend state.By meeting item
Part formula (1), to even if can also obtain having in entire zooming range good when realizing the high zoom ratios of 35 times~45 times sizes
The miniature zoom lens of good optical property.
If the numerical value of conditional (1) is upper limit value or more, i.e., if the transverse direction of the telescope end state of the 5th lens group is put
Big multiplying power becomes larger, then each aberration correction will become difficult, it is difficult to realize good optical property in entire zooming range.Another party
Face, if conditional (1) if numerical value be lower limit value hereinafter, the i.e. horizontal magnification that is visible under farend state of the 5th lens group times
Rate becomes smaller, then the overall length of zoom lens entirety becomes larger when being in telescope end, becomes the obstacle of camera lens miniaturization.
On the basis of obtaining these effects, the upper limit value of conditional (1) is preferably 5.7, and more preferably 5.5.Conditional
(1) upper limit value is smaller, then when realizing high zoom ratios, the correction of each aberration is also just the better, it is easier in entire zoom model
It encloses and realizes good optical property.On the other hand, the lower limit value of conditional (1) is preferably 4.2, and more preferably 4.5.Conditional
(1) lower limit value is bigger, then is easier to reduce the overall length of the zoom lens entirety of telescope end, even if when improving zoom ratio,
It is also easier to form miniature zoom lens.
1-5-2. conditional (2)
In the zoom lens of the present embodiment, when constituting five lens groups with a negative lens, preferably satisfy below
Conditional (2).
(2) nd5 > 1.85
Wherein, nd5 is refractive index of the negative lens to d line (wavelength X=587.6nm) for constituting the 5th lens group.
Conditional (2) is the formula of the refractive index for the negative lens that regulation constitutes the 5th lens group.By with meeting conditional
(2) negative lens constitutes the 5th lens group, to when zooming, by keeping the 5th lens group mobile, can carry out picture well
The correction of each aberrations such as face bending, can obtain the zoom lens for having high optical property in entire zooming range.In addition, due to
5th lens group is the miniaturization and lightweight for being made of a negative lens, therefore being able to achieve the zoom lens.
If the numerical value of conditional (2) be lower limit value hereinafter, if the correction of curvature of the image etc. will become difficult, it is difficult to whole
A zooming range maintains good optical property.
On the basis of obtaining these effects, the lower limit value of conditional (2) is preferably 1.87, and more preferably 1.90.Condition
The lower limit value of formula (2) is bigger, and the correction of curvature of the image etc. is easier, it is easier to maintain good optics in entire zooming range
Performance.
1-5-3. conditional (3)
The zoom lens is it is also preferred that meet conditional below (3).
(3) 0.15 < F1/Ft < 0.35
Wherein, F1 is the focal length of the first lens group, the focal length of zoom lens entirety when Ft is in telescope end.
Conditional (3) be provide the focal length of the first lens group and when in telescope end zoom lens entirety the ratio between focal length
Formula.By meeting conditional (3), to be also able to achieve further on the total length direction of camera lens when realizing high zoom ratios
Miniaturization, can obtain the higher zoom lens of optical property.
If the numerical value of conditional (3) is upper limit value or more, the refracting power of the first lens group is small, when raising zoom ratio
When, the overall length of zoom lens entirety becomes larger, it is difficult to realize the miniaturization of the zoom lens.On the other hand, if conditional (3)
Numerical value is lower limit value hereinafter, then the refracting power of the first lens group is excessive, and the correction of spherical aberration or chromatic aberation will become difficult.Cause
This will increase lens number required when carrying out aberration correction to obtain good optical property in entire zooming range,
In this case also it is difficult to realize the miniaturization of the zoom lens.
On the basis of obtaining these effects, the upper limit value of conditional (3) is preferably 0.32, and more preferably 0.30.Condition
The upper limit value of formula (3) is smaller, then when realizing high zoom ratios, can also reduce the overall length of zoom lens entirety, be easy to get small-sized
Zoom lens.On the other hand, the lower limit value of conditional (3) is preferably 0.18, and more preferably 0.2.The lower limit value of conditional (3) is got over
Greatly, then the correction of spherical aberration or chromatic aberation is easier, and being easy to get has good optical property in entire zooming range
Zoom lens.
According to the zoom lens of the present embodiment, it is possible to provide have with high zoom ratios and in entire zooming range good
The miniature zoom lens of optical property.For the zoom lens of the present embodiment, even if realizing the high zoom of 35 times~45 times sizes
Than when, can also obtain entire zooming range have good optical property miniature zoom lens.
2. photographic device
Secondly, being illustrated to photographic device of the invention.Photographic device of the invention, which is characterized in that have above-mentioned
It zoom lens of the invention and is configured at the image planes side of the zoom lens and the optical imagery that the zoom lens is formed is transformed into
The photographing element of electric signal.Herein, photographing element etc. is not particularly limited, ccd sensor or cmos sensor etc. can be used
Solid-state imager etc., what photographic device of the invention was suitable for digital camera or video camera etc. has used these solids to take the photograph
The photographic device of element.In addition, the photographic device can be the fixed camera shooting of the lens that lens are fixed on shell certainly
Device is also possible to the photographic device of slr camera or the camera lens switch type without anti-single-lens camera etc..
The present invention is specifically described secondly, showing embodiment.But the present invention is not limited to embodiments below.
It is set forth below for the zoom lens of each embodiment be camera shooting for digital camera, video camera, silver halide film camera etc.
Imaging optical system in device (Optical devices).In addition, towards attached drawing, left is object side in each lens profile figure, it is right
Side is image planes side.
Embodiment 1
(1) composition of zoom lens
Fig. 1 is the lens profile figure for showing the lens of the zoom lens of the embodiment of the present invention 1 and constituting, and towards attached drawing,
Start to be followed successively by each lens profile figure under wide-angle side state, middle focal length state and telescope end state from above.The varifocal mirror
Head is by the first lens group G1 of the positive refracting power being arranged successively from object side, the second lens group G2, the positive refracting power of negative refracting power
The third lens group G3, the 4th lens group G4 of positive refracting power, the 5th lens group G5 of negative refracting power and positive refracting power the 6th
Lens group is constituted.
The diverging meniscus lens and positive lens with convex surface towards object side that first lens group G1 is configured in order by object side
Cemented lens and positive lens obtained by engagement are constituted.
Negative lens that second lens group G2 is configured in order as object side connects obtained by biconcave lens and positive lens engagement
It closes lens and negative lens is constituted.
The diverging meniscus lens institute structure of positive lens that the third lens group G3 is configured in order by object side and convex surface towards object side
At.
4th lens group G4 is by the biconvex lens that is configured in order with object side and convex surface towards the diverging meniscus lens of image side
Cemented lens obtained by engagement is constituted.
5th lens group G5 is made of a negative lens.
6th lens group G6 is made of a positive lens of convex surface towards image side.
In the zoom lens of the embodiment 1, when from wide-angle side to telescope end zoom, the first lens group G1 is fixed, and
Two lens group G2 are mobile to image side, and the third lens group G3 and the 4th lens group G4 are all in accordance with different tracks, to describe to picture
The mode of the recessed track in side is mobile, and the 5th lens group G5 is mobile to object side, and the 6th lens group G6 is fixed.As a result, when from wide-angle
When holding to telescope end zoom, the interval of the first lens group and the second lens group becomes larger, and the second lens group and the third are saturating
The interval of microscope group becomes smaller, and variation occurred at intervals between each lens group.
In addition, carrying out pair from infinity to adjacent object in a manner of moving the 4th lens group G4 to object side
It is burnt.
In turn, the second lens group G2 is stabilization group VC, by can with it is mobile in optical axis generally perpendicular direction in a manner of structure
At.By make the second lens group with moved in optical axis generally perpendicular direction, to make as in the side substantially vertical with optical axis
Upwards as mobile, when can correct because of the camera shooting such as hand shaking shake bring image blur.
In addition, " S " that the object side of the third lens group G3 is marked is aperture diaphragm in Fig. 1, when zooming with
Three lens group G3 are moved as a whole.In addition, " CG " that the image planes side of the 5th lens group G5 is marked is cover glass, table
Show low pass filter or infrared intercepting filter etc..In addition, being passed in the image side of cover glass configured with ccd sensor or CMOS
The image planes in the film face of the imaging surface of the solid-state imager of sensor etc. or silver halide film etc..These appended drawing references etc. exist
It is also identical in each lens profile figure shown in other embodiments.
(2) numerical example
Secondly, the numerical example for applying specific value to the zoom lens is illustrated.The change is shown in table 1
The lens data of zoom lens.In table 1, " face number " indicates the sequence of the lens face counted from object side, and " r " indicates lens
The radius of curvature in face, " d " indicate interval of the lens face on optical axis, and " nd " indicates the refraction to d line (wavelength X=587.6nm)
Rate, " vd " indicate the Abbe number to d line.In addition, " * (asterisk) " is enclosed after the number of face when lens face is aspherical,
When lens face is diffraction surfaces, " # (well character) " is enclosed after the number of face.It is bent when lens face is aspherical or diffraction surfaces
What rate radius " r " column indicated is radius of curvature.
It is aspherical surface data in table 2 (2-1).Table (2-1) shows asphericity coefficient when being defined with following formula.Wherein, exist
In table 2 (2-1), " E-a " expression " × 10-a”。
【Number 1】
Wherein, in above-mentioned formula, " r " indicates curvature, and " h " indicates the height from optical axis, and " k " indicates circular cone coefficient,
" A4 ", " A6 ", " A8 ", " A10 " indicate asphericity coefficient corresponding to each power.
Table 2 (2-2) and table 2 (2-3) show various data.In table (2-2), show in wide-angle side state,
The focal length (F) of zoom lens entirety under middle focal length state and telescope end state, F value (Fno), half angle of view (ω) and
Variable interval (D (i)).In addition, table 2 (2-3) shows the focal length of each lens group.
It is diffraction face data in table 3.Table 3 shows diffraction progression (m), standard when being defined with following phase functions
Change wavelength (λ), diffraction surfaces coefficient (C01, C02, C03, C04).Wherein, C01, C02, C03, C04 respectively correspond following phases
C1, C2, C3, C4 in difference function.
【Number 2】
In addition, showing each conditional (1)~conditional (3) numerical value in table 12.And the unit of the length in each table
All " mm ", it is all " ° " depending on angular unit.The also phase in each table shown in other embodiments of item involved in these tables
Together, thus explanation omitted below.
In turn, Fig. 2~Fig. 4 respectively illustrates the zoom lens and is in wide-angle side state, middle focal length state, telescope end shape
Longitudinal aberration diagram when infinity under state is focused.For each longitudinal aberration diagram, it is towards what attached drawing was successively indicated since left
Spherical aberration, distorts aberration at astigmatism.In each figure for indicating spherical aberration, the longitudinal axis is the ratio with open F value, and horizontal axis is scattered
Coke, solid line indicate the spherical aberration of d line (wavelength X=587.6nm), and dotted line indicates the sphere mapping of F line (wavelength X=486.1nm)
Difference, chain-dotted line indicate the spherical aberration of C line (wavelength X=656.3nm).In each figure for indicating astigmatism, the longitudinal axis is image height, horizontal axis
To defocus, solid line indicates that the astigmatism in sagittal plane, dotted line indicate the astigmatism on meridian plane.In each figure for indicating to distort aberration,
What is indicated is the distortion aberration when the longitudinal axis is image height, horizontal axis is to take %.Item involved in these longitudinal aberration figures is in other realities
It applies in each figure shown in example similarly, thus explanation omitted below.
Table 1
Table 2
(2-1)
(2-2)
(2-3)
Table 3
Embodiment 2
(1) composition of optical system
Fig. 5 is the lens profile figure for indicating the lens of the zoom lens of the embodiment of the present invention 2 and constituting.The zoom lens by
First lens group G1 of the positive refracting power being arranged successively from object side, the second lens group G2 of negative refracting power, positive refracting power
The 6th lens of three lens group G3, the 4th lens group G4 of positive refracting power, the 5th lens group G5 of negative refracting power and positive refracting power
Group is constituted.
The diverging meniscus lens and positive lens with convex surface towards object side that first lens group G1 is configured in order by object side
Cemented lens and positive lens obtained by engagement are constituted.
Negative lens that second lens group G2 is configured in order as object side connects obtained by biconcave lens and positive lens engagement
It closes lens and negative lens is constituted.
The diverging meniscus lens institute structure of positive lens that the third lens group G3 is configured in order by object side and convex surface towards object side
At.
4th lens group G4 is by the biconvex lens that is configured in order with object side and convex surface towards the diverging meniscus lens of image side
Cemented lens obtained by engagement is constituted.
5th lens group G5 is made of a negative lens.
6th lens group G6 is made of a positive lens of convex surface towards image side.
In the zoom lens of the embodiment 2, when from wide-angle side to telescope end zoom, the first lens group G1 is fixed, and
Two lens group G2 are mobile to image side, and the third lens group G3 and the 4th lens group are all in accordance with different tracks, to describe to image side
The mode of recessed track is mobile, and the 5th lens group G5 is mobile to object side, and the 6th lens group G6 is fixed.As a result, when from wide-angle side
When to telescope end zoom, the interval of the first lens group and the second lens group becomes larger, the second lens group and the third lens
The interval of group becomes smaller, and variation occurred at intervals between each lens group.
In addition, carrying out pair from infinity to adjacent object in a manner of moving the 4th lens group G4 to object side
It is burnt.
In turn, the second lens group G2 is stabilization group VC, by can with it is mobile in optical axis generally perpendicular direction in a manner of structure
At.By make the second lens group with moved in optical axis generally perpendicular direction, to make as in the side substantially vertical with optical axis
Upwards as mobile, when can correct because of the camera shooting such as hand shaking shake bring image blur.
(2) numerical example
Secondly, the numerical example for applying specific value to the zoom lens is illustrated.It is the varifocal mirror in table 4
The lens data of head is aspherical surface data in table 5 (5-1), is various data in table 5 (5-2) and table 5 (5-3).In addition, table 6
In be diffraction face data.In addition, table 12 shows conditional (1)~conditional (3) numerical value.In turn, Fig. 6~Fig. 8 is respectively
The zoom lens is in longitudinal aberration diagram when infinity is focused under wide-angle side state, middle focal length state, telescope end state.
Table 4
Table 5
(5-1)
(5-2)
(5-3)
Table 6
Embodiment 3
(1) composition of optical system
Fig. 9 is the lens profile figure for indicating the lens of the zoom lens of the embodiment of the present invention 3 and constituting.The zoom lens by
First lens group G1 of the positive refracting power being arranged successively from object side, the second lens group G2 of negative refracting power, positive refracting power
The 6th lens of three lens group G3, the 4th lens group G4 of positive refracting power, the 5th lens group G5 of negative refracting power and positive refracting power
Group is constituted.
The diverging meniscus lens and positive lens with convex surface towards object side that first lens group G1 is configured in order by object side
Cemented lens and positive lens obtained by engagement are constituted.
Negative lens that second lens group G2 is configured in order as object side connects obtained by biconcave lens and positive lens engagement
It closes lens and negative lens is constituted.
The diverging meniscus lens institute structure of positive lens that the third lens group G3 is configured in order by object side and convex surface towards object side
At.
4th lens group G4 is by the biconvex lens that is configured in order with object side and convex surface towards the diverging meniscus lens of image side
Cemented lens obtained by engagement is constituted.
5th lens group G5 is made of a negative lens.
6th lens group G6 is made of a positive lens of convex surface towards image side.
In the zoom lens of the embodiment 3, when from wide-angle side to telescope end zoom, the first lens group G1 is fixed, and
Two lens group G2 are mobile to image side, and the third lens group G3 and the 4th lens group G4 are all in accordance with different tracks, to describe to picture
The mode of the recessed track in side is mobile, and the 5th lens group G5 is mobile to object side, and the 6th lens group G6 is fixed.As a result, when from wide-angle
When holding to telescope end zoom, the interval of the first lens group and the second lens group becomes larger, and the second lens group and the third are saturating
The interval of microscope group becomes smaller, and variation occurred at intervals between each lens group.
In addition, carrying out pair from infinity to adjacent object in a manner of moving the 4th lens group G4 to object side
It is burnt.
In turn, the second lens group G2 is stabilization group VC, and by can with it is mobile in optical axis generally perpendicular direction in a manner of
It constitutes.By make the second lens group with moved in optical axis generally perpendicular direction, to make as substantially vertical with optical axis
As movement on direction, the shake bring image blur when camera shooting of hand shaking etc. can be corrected.
(2) numerical example
Secondly, the numerical example for applying specific value to the zoom lens is illustrated.It is the varifocal mirror in table 7
The lens data of head is aspherical surface data in table 8 (8-1), is various data in table 8 (8-2) and table 8 (8-3).In addition, table 9
In be diffraction face data.In addition, table 12 shows conditional (1)~conditional (3) numerical value.In turn, Figure 10~Figure 12 distinguishes
It is the longitudinal aberration diagram when zoom lens is in infinity focusing under wide-angle side state, middle focal length state, telescope end state.
Table 7
Table 8
(8-1)
(8-2)
(8-3)
Table 9
Embodiment 4
(1) composition of optical system
Figure 13 is the lens profile figure for indicating the lens of the zoom lens of the embodiment of the present invention 4 and constituting.The zoom lens
By the first lens group G1 of the positive refracting power being arranged successively from object side, the second lens group G2 of negative refracting power, positive refracting power
The third lens group G3, the 4th lens group G4 of positive refracting power, the 5th lens group G5 of negative refracting power and positive refracting power the 6th thoroughly
Microscope group is constituted.
The diverging meniscus lens and positive lens with convex surface towards object side that first lens group G1 is configured in order by object side
Cemented lens, positive lens obtained by engagement and positive lens are constituted.
Negative lens that second lens group G2 is configured in order as object side connects obtained by biconcave lens and positive lens engagement
It closes lens and negative lens is constituted.
The diverging meniscus lens institute structure of positive lens that the third lens group G3 is configured in order by object side and convex surface towards object side
At.
4th lens group G4 is saturating by the negative bent moon of the biconvex lens and convex surface towards image side that are configured in order with object side
Cemented lens obtained by mirror engagement is constituted.
5th lens group G5 is made of a negative lens.
6th lens group G6 is made of a positive meniscus lens of convex surface towards image side.
In the zoom lens of the embodiment 4, when from wide-angle side to telescope end zoom, the first lens group G1 is fixed, and
Two lens group G2 are mobile to image side, and the third lens group G3 and the 4th lens group G4 are all in accordance with different tracks, to describe to picture
The mode of the recessed track in side is mobile, and the 5th lens group G5 is mobile to object side, and the 6th lens group G6 is fixed.As a result, when from wide-angle
When holding to telescope end zoom, the interval of the first lens group and the second lens group becomes larger, and the second lens group and the third are saturating
The interval of microscope group becomes smaller, and variation occurred at intervals between each lens group.
In addition, carrying out pair from infinity to adjacent object in a manner of moving the 4th lens group G4 to object side
It is burnt.
In turn, the second lens group G2 is stabilization group VC, by can with it is mobile in optical axis generally perpendicular direction in a manner of structure
At.By make the second lens group with moved in optical axis generally perpendicular direction, to make as in the side substantially vertical with optical axis
Upwards as mobile, when can correct because of the camera shooting such as hand shaking shake bring image blur.
(2) numerical example
Secondly, the numerical example for applying specific value to the zoom lens is illustrated.It is the zoom in table 10
The lens data of camera lens is aspherical surface data in table 11 (11-1), is various data in table 11 (11-2) and table 11 (11-3).
In addition, table 12 shows conditional (1)~conditional (3) numerical value.In turn, Figure 14~Figure 16 is that the zoom lens is in respectively
Longitudinal aberration diagram when infinity is focused under wide-angle side state, middle focal length state, telescope end state.
Table 10
Table 11
(11-1)
(11-2)
(11-3)
Table 12
| Embodiment | 1 | 2 | 3 | 4 |
| Fw | 4.35 | 4.35 | 4.35 | 4.35 |
| Ft | 184.00 | 164.00 | 150.08 | 158.00 |
| F1 | 41.199 | 42.055 | 41.497 | 45.030 |
| F2 | -6.022 | -6.283 | -6.074 | -7.036 |
| F3 | 16.975 | 18.185 | 21.155 | 17.797 |
| F4 | 16.069 | 15.242 | 15.264 | 15.164 |
| F5 | -5.712 | -5.962 | -6.546 | -5.813 |
| F6 | 11.278 | 10.952 | 10.762 | 11.707 |
| TTL | 86.00 | 86.00 | 86.00 | 93.55 |
| Conditional 1 | 5.34 | 5.18 | 4.75 | 4.93 |
| Conditional 2 | 2.001 | 2.001 | 2.001 | 1.921 |
| Conditional 3 | 0.224 | 0.256 | 0.277 | 0.285 |
Industrial applicibility
According to the present invention, it is possible to provide there is the small of good optical property with high zoom ratios and in entire zooming range
Type zoom lens and photographic device.
Claims (11)
1. a kind of zoom lens, which is characterized in that
By the first lens group, the second lens group, the third lens group, the 4th lens group, the 5th lens configured in order from object side
Group and the 6th lens group are constituted,
5th lens group has negative refracting power, is carried out by least making the 5th lens group mobile from wide-angle side to looking in the distance
The zoom at end,
And meet conditional below (1),
(1) 4.0 < β 5T < 6.0
Wherein,
The horizontal magnification multiplying power of the 5th lens group when β 5T is in telescope end.
2. zoom lens as described in claim 1, which is characterized in that the 6th lens group has positive refracting power.
3. zoom lens as described in claim 1, which is characterized in that described when carrying out zoom to telescope end from wide-angle side
6th lens group is fixed on optical axis direction.
4. zoom lens as described in claim 1, which is characterized in that first lens group has a positive refracting power, and described the
Two lens groups have negative refracting power.
5. zoom lens as described in claim 1, which is characterized in that when carrying out zoom to telescope end from wide-angle side, with institute
It states the first lens group and is fixed on optical axis direction, and first lens group and the interval of second lens group is made to become larger, institute
The mode that the interval of the second lens group and the third lens group becomes smaller is stated, to keep second lens group mobile.
6. zoom lens as described in claim 1, which is characterized in that the 5th lens group is made of a piece of negative lens, and
Meet conditional below (2),
(2) nd5 > 1.85
Wherein,
Nd5 is to constitute the negative lens of the 5th lens group to the refractive index of the d line of wavelength 587.6nm.
7. zoom lens as described in claim 1, which is characterized in that the third lens group and the 4th lens group are all
With positive refracting power.
8. such as zoom lens according to any one of claims 1 to 7, which is characterized in that by moving the 4th lens group
It moves to carry out the focusing from infinity to closer object.
9. zoom lens as described in claim 1, which is characterized in that
First lens group has the cemented lens and at least a piece of positive simple lens configured in order from object side, the engagement
Lens are the cemented lens obtained by a piece of negative lens and the engagement of a piece of positive lens,
And meet conditional below (3),
(3) 0.15 < F1/Ft < 0.35
Wherein,
F1 is the focal length of the first lens group,
The focal length of zoom lens entirety when Ft is in telescope end.
10. zoom lens as described in claim 1, which is characterized in that second lens group is substantially vertical with optical axis
Direction on the mode that can move constitute, by make the second lens group with moved in optical axis generally perpendicular direction, thus
Make as with moved in optical axis generally perpendicular direction.
11. a kind of photographic device, which is characterized in that there is such as zoom lens according to any one of claims 1 to 10, in institute
The image side for stating zoom lens is provided with the photographing element that the optical imagery formed by the zoom lens is transformed to electric signal.
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| JP2015087844A JP6568709B2 (en) | 2015-04-22 | 2015-04-22 | Zoom lens and imaging device |
| JP2015-087844 | 2015-04-22 |
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| JP2018194750A (en) * | 2017-05-19 | 2018-12-06 | 富士フイルム株式会社 | Zoom lens and imaging apparatus |
| CN108227154A (en) * | 2018-03-26 | 2018-06-29 | 中国计量大学 | A kind of mobile phone wide-angle zoom lens |
| JP7032226B2 (en) * | 2018-04-27 | 2022-03-08 | 株式会社タムロン | Zoom lens and image pickup device |
| CN111615822B (en) * | 2019-01-03 | 2022-02-08 | 核心光电有限公司 | Dual camera |
| CN112904542B (en) * | 2021-01-28 | 2022-03-04 | 中国科学院西安光学精密机械研究所 | Low-distortion high-definition continuous zooming optical system |
| CN114994885B (en) * | 2022-06-17 | 2023-09-01 | 湖南长步道光学科技有限公司 | Full-frame optical system with micro-distance function and movie lens |
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| JPH10333038A (en) * | 1997-06-05 | 1998-12-18 | Minolta Co Ltd | Zoom lens |
| JPH1172705A (en) * | 1997-08-29 | 1999-03-16 | Tochigi Nikon:Kk | Zoom lens provided with two and more focusing lens groups |
| KR100604310B1 (en) * | 2004-04-23 | 2006-07-25 | 삼성테크윈 주식회사 | High magnification zoom lens |
| JP5040408B2 (en) * | 2007-04-11 | 2012-10-03 | ソニー株式会社 | Zoom lens and imaging device |
| US7864443B2 (en) * | 2007-12-07 | 2011-01-04 | Ricoh Company, Ltd. | Zoom lens, imaging apparatus, and personal data assistant |
| JP2009192771A (en) * | 2008-02-14 | 2009-08-27 | Sony Corp | Zoom lens, image pickup apparatus, and control method for zoom lens |
| TWI457633B (en) * | 2011-04-22 | 2014-10-21 | Ability Entpr Co Ltd | Zoom lens |
| JP5760965B2 (en) * | 2011-11-04 | 2015-08-12 | 株式会社ニコン | Variable magnification optical system, optical apparatus, and variable magnification optical system manufacturing method |
| JP6071465B2 (en) * | 2012-11-22 | 2017-02-01 | キヤノン株式会社 | Zoom lens and imaging apparatus having the same |
| JP6143475B2 (en) * | 2013-01-30 | 2017-06-07 | キヤノン株式会社 | Zoom lens and imaging apparatus having the same |
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