CN110146970A - A kind of imaging lens and imaging device - Google Patents
A kind of imaging lens and imaging device Download PDFInfo
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- CN110146970A CN110146970A CN201910569908.7A CN201910569908A CN110146970A CN 110146970 A CN110146970 A CN 110146970A CN 201910569908 A CN201910569908 A CN 201910569908A CN 110146970 A CN110146970 A CN 110146970A
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- G—PHYSICS
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- 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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Abstract
The present invention provides a kind of imaging lens and imaging devices.Imaging lens include the first lens group with positive light coke sequentially configured from the object side to image side, the second lens group with negative power, diaphragm and the third lens group with positive light coke；The second lens group is moved along optical axis in focussing process, and the first lens group and the third lens group are fixed with respect to the position of image planes；Imaging lens meet conditional: 0.4 < F1/ F≤1.5, wherein F indicates the focal length of imaging lens, F1Indicate the synthesis focal length of the first lens group.It is possible thereby to reduce the weight of total system, a kind of small-sized, light weight, heavy caliber, and imaging lens and imaging device with excellent imaging performance are provided.Meanwhile the focusing component of this imaging lens can accomplish only include a piece of lens, be conducive to imaging lens and imaging device rapid focus and light-weighted realization.
Description
Technical field
The present invention relates to optical image technology field more particularly to a kind of imaging lens and imaging device.
Background technique
Standard portrait lens generally refers to the camera lens in the distance of camera lens 1.5m~2m according to people, according to general aesthetics
Viewpoint sees that the face of a people are most beautiful outside 1.5~2m.Because the transparent effect of this distance makes the nose of people seem
Than true smaller, face is unlikely to peaceful.And habit is only according to the head and shoulder of people when generally according to portrait.So we
The portrait of described standard is looked in the mirror head, generally refers to the camera lens in the distance of camera lens 1.5m~2m according to people, it is long any can also
With again but distance is bad to link up with the people shone, and apart from close, deformation is produced.Standard portrait lens usually has
20 °~35 ° of field angle, the camera lens can blur the object outside field angle, highlight people/object in field angle, thus by
Portrait produces institute's widespread demand.
The standard portrait lens of existing big F value generally uses Triplet (three pieces eyeglass) lens construction, and for F value
Heavy caliber standard lens less than 2 then generallys use double gauss structure.But since double Gauss lens belongs to symmetrical structure, exist
Hereby ten thousand values are larger, and focusing lens set, which is that whole group camera lens is mobile, causes electronics focusing speed excessively slow and not precisely, in addition whole body
Product is excessive overweight, not readily portable.
Summary of the invention
In order to solve the problems in the existing technology, the present invention provides a kind of imaging lens and imaging device, body are small
Amount is light, and focusing component can accomplish only a piece of eyeglass, have the characteristics that focusing speed is fast, imaging performance is excellent.
For this purpose, the purpose of the present invention is realized by following technical solution:
A kind of imaging lens, including what is sequentially configured from the object side to image side: there is the first lens group of positive light coke, have
The second lens group, diaphragm and the third lens group with positive light coke of negative power；
Second lens group described in focussing process is moved along optical axis, first lens group and the third lens group phase
The position of image planes is fixed；
The imaging lens satisfy the following conditional expression:
0.4<F1/ F≤1.5,
Wherein, F indicates the focal length of the imaging lens, F1Indicate the synthesis focal length of first lens group.
Further, first lens group includes balsaming lens group, and the balsaming lens group is by positive and negative lenses
Composition, the positive lens satisfy the following conditional expression:
70≤νd≤ 95,
Wherein, νdIt is defined as Abbe number of the medium about the light that wavelength is 587.6nm.
Further, first lens group further includes the first positive lens and the second positive lens, and first positive lens is set
In the object side of second positive lens, the balsaming lens is mounted on the image side of second positive lens；
The radius of curvature of the image side surface of second positive lens is R2b, the radius of curvature of the object side of the balsaming lens group
For R3a, and satisfy the following conditional expression:
1 < R3a/R2b< 13.
Further, second lens group includes that at least one piece of negative lens, negative lens satisfies the following conditional expression:
1.59≤nd≤ 1.70,
Wherein, ndIt is defined as refractive index of the medium about the light that wavelength is 587.6nm.
Further, second lens group includes that at least one piece of negative lens, negative lens satisfies the following conditional expression:
50≤νd≤ 83,
Wherein, νdIt is defined as Abbe number of the medium about the light that wavelength is 587.6nm.
Further, the third lens group is configured with one piece of negative meniscus, and the negative meniscus is in object side
The radius of curvature of face and image side surface is respectively Ra、Rb, and satisfy the following conditional expression:
1 < (Ra+Rb)/(Ra-Rb) < 15.
Further, the synthesis focal length F of the third lens group3It satisfies the following conditional expression:
0.5≤F3/F≤1.5。
Further, closest to the distance between the lens surface of image side and image planes B in the imaging lensfMeet following
Conditional:
0.17<Bf/F<0.29。
Further, by object side to image side direction,
First lens group is sequentially configured with the first positive lens, the second positive lens, the first negative lens and third positive lens,
First negative lens and the third positive lens groups are at glued lens group；
Second lens group is configured with the second negative lens；
The third lens group is sequentially configured with the 4th positive lens, third negative lens, the 5th positive lens and the 4th negative lens.
In addition, the present invention also provides a kind of imaging devices comprising above-mentioned any imaging lens.
Imaging lens and imaging device of the invention at least have the following beneficial effects:
This imaging lens and imaging device pass through 0.4 < F of conditional1/ F≤1.5 define the focal length model of the first lens group
It encloses, to define incident angle and the entrance pupil position of the first lens group light.Within the scope of the conditional, the position of entrance pupil is more
Proximity object side, entrance pupil size are also smaller.In the identical situation of field angle, the intersection point of chief ray and lens is closer from optical axis, because
The bore of this first lens group can be designed smaller, and all aberrations such as the spherical aberration as caused by light drift angle, distortion are also corresponding
Ground is smaller.It is possible thereby to reduce the weight of total system, a kind of small-sized, light weight, heavy caliber are provided, and there is excellent imaging
The imaging lens and imaging device of energy.Meanwhile the focusing component of this imaging lens can accomplish only to include a piece of lens, be conducive to
The realization of the rapid focus and miniaturization of imaging lens and imaging device.
Detailed description of the invention
In order to illustrate the technical solution of the embodiments of the present invention more clearly, below will be to needed in the embodiment attached
Figure is briefly described, it should be understood that the following drawings illustrates only certain embodiments of the present invention, therefore is not construed as pair
The restriction of range for those of ordinary skill in the art without creative efforts, can also be according to this
A little attached drawings obtain other relevant attached drawings.
Fig. 1 shows the lens construction schematic diagram of the imaging lens of the embodiment of the present invention 1；
Fig. 2A shows sphere mapping differential of the imaging lens of the offer of the embodiment of the present invention 1 at focus for infinity (INF)
It is intended to；
Fig. 2 B shows astigmatism schematic diagram of the imaging lens of the offer of the embodiment of the present invention 1 at focus for infinity (INF)；
Fig. 2 C shows sphere mapping differential of the imaging lens of the offer of the embodiment of the present invention 1 at focus for infinity (0.8m)
It is intended to；
Fig. 2 D shows astigmatism signal of the imaging lens of the offer of the embodiment of the present invention 1 at focus for infinity (0.8m)
Figure；
Fig. 3 shows the lens construction schematic diagram of the imaging lens of the embodiment of the present invention 2；
Fig. 4 A shows sphere mapping differential of the imaging lens of the offer of the embodiment of the present invention 2 at focus for infinity (INF)
It is intended to；
Fig. 4 B shows astigmatism schematic diagram of the imaging lens of the offer of the embodiment of the present invention 2 at focus for infinity (INF)；
Fig. 4 C shows sphere mapping differential of the imaging lens of the offer of the embodiment of the present invention 2 at focus for infinity (0.8m)
It is intended to；
Fig. 4 D shows astigmatism signal of the imaging lens of the offer of the embodiment of the present invention 2 at focus for infinity (0.8m)
Figure；
Fig. 5 shows the lens construction schematic diagram of the imaging lens of the embodiment of the present invention 3；
Fig. 6 A shows sphere mapping differential of the imaging lens of the offer of the embodiment of the present invention 3 at focus for infinity (INF)
It is intended to；
Fig. 6 B shows astigmatism schematic diagram of the imaging lens of the offer of the embodiment of the present invention 3 at focus for infinity (INF)；
Fig. 6 C shows sphere mapping differential of the imaging lens of the offer of the embodiment of the present invention 3 at focus for infinity (0.8m)
It is intended to；
Fig. 6 D shows astigmatism signal of the imaging lens of the offer of the embodiment of the present invention 3 at focus for infinity (0.8m)
Figure.
Specific embodiment
The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end
Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached
The embodiment of figure description is exemplary, and for explaining only the invention, and is not considered as limiting the invention.
In the description of the present invention, it is to be understood that, term " center ", " longitudinal direction ", " transverse direction ", " length ", " width ",
" thickness ", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outside", " up time
The orientation or positional relationship of the instructions such as needle ", " counterclockwise ", " axial direction ", " radial direction ", " circumferential direction " be orientation based on the figure or
Positional relationship is merely for convenience of description of the present invention and simplification of the description, rather than the device or element of indication or suggestion meaning must
There must be specific orientation, be constructed and operated in a specific orientation, therefore be not considered as limiting the invention.
In addition, term " first ", " second " are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance
Or implicitly indicate the quantity of indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or
Implicitly include one or more of the features.In the description of the present invention, the meaning of " plurality " is two or more,
Unless otherwise specifically defined.
In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " fixation " etc.
Term shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integral；It can be mechanical connect
It connects, is also possible to be electrically connected；It can be directly connected, can also can be in two elements indirectly connected through an intermediary
The interaction relationship of the connection in portion or two elements.It for the ordinary skill in the art, can be according to specific feelings
Condition understands the concrete meaning of above-mentioned term in the present invention.
In the present invention unless specifically defined or limited otherwise, fisrt feature in the second feature " on " or " down " can be with
It is that the first and second features directly contact or the first and second features pass through intermediary mediate contact.Moreover, fisrt feature exists
Second feature " on ", " top " and " above " but fisrt feature be directly above or diagonally above the second feature, or be merely representative of
First feature horizontal height is higher than second feature.Fisrt feature can be under the second feature " below ", " below " and " below "
One feature is directly under or diagonally below the second feature, or is merely representative of first feature horizontal height less than second feature.
Hereinafter, according to examples and drawings, the present invention is described in further detail:
Imaging lens of the invention include the first lens group with positive light coke sequentially configured from the object side to image side, tool
There are the second lens group, diaphragm and the third lens group with positive light coke of negative power.Second lens group edge in focussing process
Optical axis it is mobile, the first lens group and the third lens group are fixed with respect to the position of image planes.
Imaging lens satisfy the following conditional expression:
0.4<F1/F≤1.5 (1)
Wherein, F indicates the focal length of the imaging lens, F1Indicate the synthesis focal length of first lens group.
Conditional defines the focal range of the first lens group in (1), to define the incidence of the first lens group light
Angle and entrance pupil position, in conditional (1) range, closer to object side, entrance pupil size is also smaller for the position of entrance pupil.In field angle
In identical situation, the intersection point of chief ray and lens is closer from optical axis, therefore the bore of the first lens group can be designed smaller,
And all aberrations such as the spherical aberration as caused by light drift angle, distortion are also correspondingly smaller.
The imaging lens that the synthesis focal length of the first lens group is configured according to conditional (1), can reduce the weight of total system
Amount provides a kind of small-sized, light weight, heavy caliber, and the imaging lens with excellent imaging performance.Enable to this imaging lens
Always with the F value and 20~35 ° of field angle of 1.6-2.2, it can be used as standard portrait description camera lens.Certainly, this imaging lens
Head can also be used suitably when with len changeable camera, video camera, digital camera, broadcast camera.Meanwhile
The focusing component of this imaging lens can accomplish only to include a piece of lens, realize the rapid focus of imaging lens.
Work as F1/ F is more than the lower limit of conditional (1), then the focal length of the first lens group is too small, and focal power is excessive, while first
Lens group eyeglass bore will increase, and all aberrations such as generated spherical aberration are also difficult to correct by the second the third lens group, be not achieved into
As high-quality and portability requirement.If F1/ F is more than the upper limit of conditional (1), and consequence is that the optical system of imaging lens is total
Length is too long, and the size of imaging lens is caused to increase.
If the above conditions (1) meet range as shown below,
0.8<F1/F≤1.2 (1a)
By meeting conditional (1a) limited range, further increasing for imaging performance is realized.
In addition, the first lens group includes balsaming lens group, balsaming lens group is made of positive and negative lenses, and positive lens is full
It is enough lower conditional:
70≤νd≤95 (2)
Wherein, νdIt is defined as Abbe number of the medium about the light that wavelength is 587.6nm.
Conditional (2) defines the abbe number of the positive lens of balsaming lens group in the first lens group, determines that first is saturating
The degree of correction of microscope group chromatism of position and ratio chromatism, is an important factor for influencing imaging performance.
If the Abbe number of the positive lens of balsaming lens group is more than the lower limit of conditional (2), cemented doublet group corrects two kinds
Color difference ability is on the weak side, is unfavorable for the correction of entire imaging lens color difference.If the Abbe number of the positive lens of balsaming lens group is more than item
The upper limit of part formula (2), then will lead to the lens cost it is excessively high (Abbe number be more than 95 lens it is extremely expensive), and performance mistake
It is surplus.In conclusion the Abbe number restriction of the positive lens can be reduced imaging lens cost in a certain range, imaging lens are improved
Performance.
If the above conditions (2) meet range as shown below,
80≤νd≤90 (2a)
By meeting conditional (2a) limited range, advanced optimizing for imaging performance and cost is realized.
In addition, the first lens group further includes the first positive lens and the second positive lens, the first positive lens is set to the second positive lens
Object side, balsaming lens is mounted on the image side of the second positive lens.The radius of curvature of the image side surface of second positive lens is R2b, glued saturating
The radius of curvature of the object side of microscope group is R3a, and satisfy the following conditional expression:
1 < R3a/R2b< 13 (3)
Conditional (3) defines the focal power allocation proportion in the first lens group, and imaging lens are by meeting conditional
(3), it is able to maintain that good imaging performance.
If R3a/R2bThe lower limit of conditional (3) is had exceeded, then the radius of curvature mistake of the lens of the object side of balsaming lens group
Small, although result reduces negative spherical aberration, but can lengthen the second lens group to diaphragm interval, is equivalent to and extends imaging lens
Total length.If R3a/R2bHaving exceeded the upper limit of conditional (3), then the power of lens of the object side of balsaming lens group is too small,
The spherical aberration of generation is excessive, is unfavorable for the correction of whole group imaging lens spherical aberration.
If the above conditions (3) meet range as shown below,
5 < R3a/R2b< 9 (3a)
By meeting conditional (3a) limited range, further increasing for imaging performance is realized.
In addition, the second lens group includes that at least one piece of negative lens, negative lens satisfies the following conditional expression:
1.59≤nd≤1.70 (4)
50≤νd≤83 (5)
Wherein, nd、νdIt is respectively defined as refractive index and Abbe number of the medium about the light of wavelength 587.6nm.
Conditional (4), (5) have respectively provided the refractive index and Abbe number of negative lens, are worth as defined in the conditional, determine
Chromatism of position and ratio chromatism, after second lens group are an important factor for influencing imaging performance.
If it is more than the upper limit of conditional (5) that refractive index, which is more than the lower limit of conditional (4), Abbe number, to the first lens group
Generated chromatism of position and spherical aberration correction are insufficient, lead to the deterioration of imaging performance, therefore be not preferred.If refractive index is super
Cross the upper limits of conditional (4), Abbe number be more than conditional (5) lower limit, then to chromatism of position caused by the first lens group and
Spherical aberration correction is superfluous, leads to the deterioration of imaging performance, therefore be not preferred.
If the above conditions (4), (5) meet range as shown below,
1.63≤nd≤1.68 (4a)
60≤νd≤70 (5a)
By meeting the conditional (4a), (5a) limited range, further increasing for imaging performance is realized.
Above-mentioned, the second lens group can only include one piece of negative lens, move realization quickly along optical axis by the negative lens
Focusing.
In addition, the third lens group is configured with one piece of negative meniscus, negative meniscus is in object side and image side surface
Radius of curvature is respectively Ra、Rb, and satisfy the following conditional expression:
1 < (Ra+Rb)/(Ra-Rb) < 15 (6)
Conditional (6) defines the correction ratio of the spherical aberration of negative meniscus in the third lens group.Imaging lens
By meeting conditional (6), it is able to maintain that good imaging performance.
If the correction ratio of the spherical aberration of negative meniscus is more than the lower limit of conditional (6), negative meniscus
Focal power it is too small, as a result, causing the optics overall length of imaging lens elongated, therefore be not preferred.If negative meniscus
The correction ratio of spherical aberration is more than the upper limit of conditional (6), then the curvature of the image side surface of negative meniscus becomes excessive, is produced
Raw positive spherical surface curvature of the image is excessive, causes imaging lens performance to decline, therefore be not preferred.
If the above conditions (6) meet range as shown below,
5 < (Ra+Rb)/(Ra-Rb) < 10 (6a)
By meeting conditional (6a) limited range, further increasing for imaging performance is realized.
In addition, the synthesis focal length F of the third lens group3It satisfies the following conditional expression:
0.5≤F3/F≤1.5 (7)
Conditional (7) defines the angle of incidence of light of positive lens in the third lens group.Imaging lens are by meeting condition
Formula (7), is able to maintain that good imaging performance.
If F3/ F is more than the lower limit of conditional (7), then the synthesis focal power of the third lens group is excessive, as a result, generate
Spherical aberration is excessive, it is superfluous to cause spherical aberration correction, therefore be not preferred.If F3/ F is more than the upper limit of conditional (7), then third is saturating
The synthesis focal power of microscope group is too small, and generation spherical aberration,positive is too small, it is insufficient to cause spherical aberration correction, therefore be not preferred.
If the above conditions (7) meet range as shown below,
0.8≤F3/F≤1.2 (7a)
By meeting conditional (7a) limited range, further increasing for imaging performance is realized.
In addition, closest to the distance between the lens surface of image side and image planes B in imaging lensfIt satisfies the following conditional expression:
0.17<Bf/F<0.29 (8)
Conditional (8) while guaranteeing interchangeable for micro- one camera etc. for realizing the high optical property of imaging lens
The camera of camera lens.This imaging lens is such as configured to the micro- single-lens of 85mmF1.8.
If Bf/ F is more than the lower limit of conditional (8), and rear cut-off distance becomes too short relative to the focal length of optical system, so that difficult
It is suitable for micro- one camera optical system to obtain.If Bf/ F is more than the upper limit of conditional (8), and rear cut-off distance is relative to optical system
Focal length become relatively too long, refracting power distribution becomes further from symmetric form, and therefore, it is difficult to correcting distorted and can not achieve
High optical property.
If the above conditions (8) meet range as shown below,
0.21<Bf/F<0.25 (8a)
By meeting conditional (8a) limited range, further increasing for imaging performance is realized.
The present invention also provides a kind of imaging devices, including above-mentioned imaging lens.
In conclusion imaging lens provided by the invention and imaging device, have small in size, light-weight, focusing component
There is the feature of a piece of eyeglass, can be made optical lens rapid, easy to carry, that imaging is outstanding of focusing.
Hereinafter, in lens data, refractive index and focal length are d line (wave based on the attached drawing imaging lens that the present invention will be described in detail
Long 587.6nm) value.Wherein, in imaging lens related data, the unit of length is mm, and omission is shown its unit.
It should be noted that as follows in table and symbol used in being described below:
" i " indicates surface number；"ri" it is radius of curvature；"di" it is table on axis between i-th of surface and i+1 surface
Identity distance from；"nd" it is refractive index；"νi" it is Abbe number；"Fno." it is F number；" ω " is angle of half field-of view.About surface number, " ASP " table
Show that the surface is aspherical, and about radius of curvature, " ∞ " indicates that the surface is plane.In addition, about axis upper surface distance,
Variable distance in each table is with the sequence instruction of " focus for infinity (INF) " and " minimum distance focuses (0.8m) ".
In addition, refractive index and Abbe number are the refractive index and Abbe number about d line (wavelength 587.6nm).
Embodiment 1
As shown in Figure 1, the composition of imaging lens is in the present embodiment, sequentially it is configured with from the object side of diagram at image side
Following lens group: the first lens group GR1 with positive light coke, the second lens group GR2, diaphragm and tool with negative power
There is the third lens group GR3 of positive light coke.The second lens group is moved along optical axis in focussing process, and the first lens group and third are saturating
Microscope group is fixed relative to image planes.
Further, by object side to image side direction, the first lens group successively includes positive lens L11, positive lens L12, bears thoroughly
Mirror L13 and positive lens L14, wherein negative lens L13 and positive lens L14 forms balsaming lens group；Second lens group is negative lens
L21；The third lens group configures in order positive lens L31, negative lens L32, positive lens L33 and negative lens L34.Negative lens L34 is curved
Month shape negative lens.
The negative lens L34 and image surface of the third lens group GR3 are arranged in by a kind of parallel plate GL of filter configuration
Between IMG.Rear cut-off distance is from the image side surface of L34 to the distance of image surface IMG, and wherein parallel glass plates GL can be transformed to sky
Gas.
The following table shows the various numeric datas of the imaging lens about the present embodiment, wherein surface SiFor imaging lens by
The surface for the eyeglass that object plane is sequentially configured to image planes.
Fig. 2A~2B show focus for infinity (INF), Fig. 2 C~2D show minimum distance focus (0.8m) when,
According to all aberration diagrams of the imaging lens of the present embodiment.
F line, d line, C line represent F line (wavelength 486nm), d line (wavelength 588nm), C line (wavelength 656nm) sphere mapping
Difference.In addition, solid line S indicates chief ray d line in the value of sagittal image surface, and solid line T indicates master in the schematic diagram for illustrating astigmatism
Value of the light d line in meridianal image surface.Above description in relation to various aberration curve figures is identical as other embodiments, hereinafter will not
It repeats.
By diagram 2A~2D, it can be concluded that, the imaging lens of the present embodiment have excellent imaging effect.
Embodiment 2
As shown in figure 3, the present embodiment is the difference from embodiment 1 is that the lens parameter of imaging lens is different.Hereinafter, showing
The various numeric datas of imaging lens about the present embodiment.
Fig. 4 A~4B is illustrated in focus for infinity (INF), and Fig. 4 C~4D is illustrated in minimum distance focusing
When (0.8m), according to all aberration diagrams of the imaging lens of the present embodiment.
By diagram 4A~4D, it can be concluded that, the imaging lens of the present embodiment have excellent imaging effect.
Embodiment 3
As shown in figure 5, the present embodiment is the difference from embodiment 1 is that the lens parameter of imaging lens is different.Hereinafter, showing
The various numeric datas of imaging lens about the present embodiment.
Fig. 6 A~6B is illustrated in focus for infinity (INF), and Fig. 6 C~6D is illustrated in minimum distance focusing
When (0.8m), according to all aberration diagrams of the imaging lens of the present embodiment.
By diagram 6A~6D, it can be concluded that, the imaging lens of the present embodiment have excellent imaging effect.
Lower table shows the calculated value list of the conditional 1~8 of each embodiment.
Although the embodiments of the present invention has been shown and described above, it is to be understood that above-described embodiment is example
Property, it is not considered as limiting the invention, those skilled in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, modifies, replacement and variant.
Claims (10)
1. a kind of imaging lens, which is characterized in that including what is sequentially configured from the object side to image side: first with positive light coke is saturating
Microscope group, the second lens group with negative power, diaphragm and the third lens group with positive light coke；
Second lens group described in focussing process is moved along optical axis, and first lens group and the third lens group are with respect to picture
The position in face is fixed；
The imaging lens satisfy the following conditional expression:
0.4<F1/ F≤1.5,
Wherein, F indicates the focal length of the imaging lens, F1Indicate the synthesis focal length of first lens group.
2. imaging lens according to claim 1, which is characterized in that first lens group includes balsaming lens group, institute
It states balsaming lens group to be made of positive and negative lenses, the positive lens satisfies the following conditional expression:
70≤νd≤ 95,
Wherein, νdIt is defined as Abbe number of the medium about the light that wavelength is 587.6nm.
3. imaging lens according to claim 2, which is characterized in that first lens group further include the first positive lens and
Second positive lens, first positive lens are set to the object side of second positive lens, and the balsaming lens is mounted on described second
The image side of positive lens；
The radius of curvature of the image side surface of second positive lens is R2b, the radius of curvature of the object side of the balsaming lens group is
R3a, and satisfy the following conditional expression:
1 < R3a/R2b< 13.
4. imaging lens according to claim 1, which is characterized in that second lens group includes at least one piece negative saturating
Mirror, the negative lens satisfy the following conditional expression:
1.59≤nd≤ 1.70,
Wherein, ndIt is defined as refractive index of the medium about the light that wavelength is 587.6nm.
5. imaging lens according to claim 1, which is characterized in that second lens group includes at least one piece negative saturating
Mirror, the negative lens satisfy the following conditional expression:
50≤νd≤ 83,
Wherein, νdIt is defined as Abbe number of the medium about the light that wavelength is 587.6nm.
6. imaging lens according to claim 1, which is characterized in that the third lens group is negative configured with one piece of falcate
Lens, radius of curvature of the negative meniscus in object side and image side surface is respectively Ra、Rb, and satisfy the following conditional expression:
1 < (Ra+Rb)/(Ra-Rb) < 15.
7. imaging lens according to claim 1, which is characterized in that the synthesis focal length F of the third lens group3Meet with
Lower conditional:
0.5≤F3/F≤1.5。
8. imaging lens according to claim 1, which is characterized in that closest to the lens measure of image side in the imaging lens
The distance between face and image planes BfIt satisfies the following conditional expression:
0.17<Bf/F<0.29。
9. imaging lens according to claim 1, which is characterized in that by object side to image side direction,
First lens group is sequentially configured with the first positive lens, the second positive lens, the first negative lens and third positive lens, described
First negative lens and the third positive lens groups are at glued lens group；
Second lens group is configured with the second negative lens；
The third lens group is sequentially configured with the 4th positive lens, third negative lens, the 5th positive lens and the 4th negative lens.
10. a kind of imaging device, which is characterized in that including imaging lens as claimed in any one of claims 1-9 wherein.
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| CN111443470A (en) * | 2020-05-09 | 2020-07-24 | 深圳市雷影光电科技有限公司 | Internal focusing type imaging lens |
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