CN105242379B - Imaging lens system - Google Patents
Imaging lens system Download PDFInfo
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- CN105242379B CN105242379B CN201410289696.4A CN201410289696A CN105242379B CN 105242379 B CN105242379 B CN 105242379B CN 201410289696 A CN201410289696 A CN 201410289696A CN 105242379 B CN105242379 B CN 105242379B
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Abstract
The invention provides a kind of imaging lens system, sequentially include from the object side to image side：First camera lens, there is positive refractive power；Second camera lens, there is negative refractive power；And three-lens, there is positive refractive power or negative refractive power, wherein view angle theta meets following condition, 0.7 ＜ | tan θ | ＜ 1.5.
Description
Technical field
The present invention relates to imaging lens system.
Background technology
Use such as charge coupled device (charge coupled device, CCD) or complementary metal oxide semiconductor
The phase of the solid state image sensors such as (complementary metal oxide semiconductor, CMOS) imaging sensor
Machine is popularized rapidly.
In order to improve the resolution ratio of camera, it is necessary to improve the degree of integration of pixel of solid state image sensor.And with camera by
Become smaller and lighter in the raising for the performance for being built into lens optical device therein, camera is just integrated into various shiftings extensively
In dynamic device.
In lens optical device included in these cameras, when the quantity increase of camera lens, desired property can be obtained
Energy；However, the quantity of increase camera lens is not suitable for the small-sized and light-duty camera of lower cost.Therefore, it is small-sized suitable for obtaining
And the design of the desired performance of light-duty camera is necessary.
In this lens design, it is widely used by using two to four camera lenses to realize fixed focus lens system
The method of system, and the advantages of in view of under each situation and the specification of desired performance determines the structure of individual lenses.Citing
For, if using two camera lenses, then because the size of pixel reduces, it is thus possible to can not fully aberration correction.If
Use four camera lenses, then can fully aberration correction, but the total length increase of lens system.
Therefore, just proposing to meet desired specification (example by using a small amount of camera lens (that is, two to four camera lenses)
Such as, focal length, visual angle and aberration correction) various designs.
The content of the invention
The present invention provides a kind of imaging lens system for including three camera lenses.
According to an aspect of the present invention, there is provided a kind of imaging lens system, sequentially included from thing side to plane of delineation side：The
One camera lens, there is positive refractive power；Second camera lens, there is negative refractive power；And three-lens, there is positive refractive power or negative dioptric
Power, wherein view angle theta meet following condition, 0.7 ＜ | tan θ | ＜ 1.5.
Imaging lens system can also meet following condition：4.8 ＜ f/D1 ＜ 5.0,
Wherein f represents the focal length of the imaging lens system, and D1 is the half bore of first camera lens at the thing side
Footpath.
Imaging lens system can also meet following condition：0.7 ＜ TTL/f ＜ 1.2,
Wherein TTL represents distance from the thing side surface of first camera lens to described image plane, and f represent it is described into
As the focal length of lens system.
Imaging lens system can also meet following condition：0.7 ＜ TTL/f ＜ 1.2,
Wherein TTL represents distance from the thing side surface of first camera lens to described image plane, and f represent it is described into
As the focal length of lens system.
Imaging lens system can also meet following condition：1.95 ＜ D1/D3 ＜ 1.5,
Wherein D1 represents the semiaperture of first camera lens at the thing side, and D3 is represented at described image planar side
The semiaperture of the three-lens.
Second camera lens can have minimum half bore in first camera lens, second camera lens and the three-lens
Footpath.
First camera lens can have the meniscus shape for being convex to the thing side.
Second camera lens can have bi-concave shape.
The three-lens can have the meniscus shape for being convex to described image planar side.
First camera lens can have at least one aspherical.
Second camera lens can have at least one aspherical.
The three-lens can have at least one aspherical.
First camera lens, second camera lens and the three-lens can be molded of plastic material.
Diaphragm may be provided between first camera lens and second camera lens.
Saturating infrared ray (IR) optical filter may be provided at described the between three-lens and the plane of delineation.
According to another aspect of the present invention, there is provided a kind of imaging device, comprising：Imaging lens system as described above；With
And imaging sensor, for the optical imagery formed by the imaging lens system to be converted into electric signal.
According to being described above, the imaging lens system with excellent optical performance and small-sized and light-duty structure is can configure,
And imaging lens system can be used for the image sensing that the optical imagery formed by imaging lens system is converted to electric signal
In the various imaging devices of device.
Brief description of the drawings
Fig. 1 is schema of the displaying according to the optical arrangement of the imaging lens system of one embodiment of the invention.
Fig. 2 is to show spherical aberration, the curvature of field on the longitudinal direction of imaging lens system according to an embodiment of the invention
Rate and the aberration diagram of distortion.
Fig. 3 is the schema of the optical arrangement of the imaging lens system of displaying according to another embodiment of the present invention.
Fig. 4 is spherical aberration, field curvature and the aberration of distortion on the longitudinal direction of displaying Fig. 3 imaging lens system
Figure.
Fig. 5 is the schema of the optical arrangement of the imaging lens system of displaying according to another embodiment of the present invention.
Fig. 6 is spherical aberration, field curvature and the aberration of distortion on the longitudinal direction of displaying Fig. 5 imaging lens system
Figure.
【Main element label declaration】
100：First camera lens
200：Second camera lens
300：Three-lens
400：Saturating infrared ray (IR) optical filter
IMG：The plane of delineation
OBJ：Thing
ST：Diaphragm
Embodiment
Hereinafter, will be by explaining the preferred embodiments of the present invention referring to accompanying drawing to describe the present invention in detail.Phase in figure
Similar components are represented like reference numeral.
Fig. 1, Fig. 3 and Fig. 5 are the schema for showing imaging lens system according to an embodiment of the invention.
Referring to Fig. 1, Fig. 3 and Fig. 5, imaging lens system includes：First camera lens 100, there is positive refractive power；Second camera lens
200, there is negative refractive power；And three-lens 300, there is positive refractive power or negative refractive power, the first camera lens 100, the second camera lens
200 and three-lens 300 sequentially arranged from thing OBJ sides to plane of delineation IMG sides.
The view angle theta of imaging lens system meets following condition.
0.7 ＜ | tan θ | ＜ 1.5 (1)
Above-mentioned condition (1) defines the visual angle of imaging lens system.In the scope more than the upper limit, spherical aberration and broom image
Poor (coma aberration) increase.In the scope less than lower limit, spherical aberration and coma aberration reduce, and visual angle is excessive
Reduce.
Imaging lens system can also meet following condition.
4.8 ＜ f/D1 ＜ 5.0 (2)
Herein, f represents the focal length of imaging lens system, and D1 is the semiaperture of the first camera lens 100 at thing side.
Condition (2) is related to the semiaperture of the first camera lens 100.Condition (2) is limited closest to the first camera lens 100 of thing side
Semiaperture, to ensure optical path, and ensure the thickness of the edge of the second camera lens 200 and three-lens 300.
Imaging lens system can also meet following condition.
0.7 ＜ TTL/f ＜ 1.2 (3)
Herein, TTL represents the total length of imaging lens system, i.e. from the thing side surface of the first camera lens 100 to the plane of delineation
IMG distance, and f represents the focal length of imaging lens system.
Above-mentioned condition (3) is for realizing the spherical aberration correction function of imaging lens system and the condition of compact size.
When the upper limit in greater than condition (3), spherical aberration can be easily corrected；However, the total length of imaging lens system becomes long.
On the other hand, when the lower limit in value TTL/f less-than conditions (3), imaging lens system becomes compact；But it is difficult to correct sphere
Aberration.
Imaging lens system can also meet following condition.
0.95 ＜ D1/D3 ＜ 1.5 (4)
Herein, the semiaperture of the first camera lens 100 at D1 expression things OBJ sides, and D3 represent at plane of delineation IMG sides the
The semiaperture of three-lens 300.
According to imaging lens system, the general lens system different from including three camera lenses, the semiaperture of the second camera lens 200
Minimum, and the semiaperture maximum of the first camera lens 100 or the semiaperture for being slightly less than three-lens 300, and in general lens system,
The semiaperture of first camera lens is minimum.Condition (4) defines the semiaperture and plane of delineation IMG sides of the first camera lens 100 at thing OBJ sides
The ratio of the semiaperture of the three-lens 300 at place, i.e. the semiaperture of the first camera lens 100 is more most than the semiaperture of three-lens 300
It is less or how much small.
By each of camera lens detailed further below for being configured like lens system.
First camera lens 100 has positive refractive power, and is formed as being convex to the meniscus of thing side.First camera lens 100 can have
It is at least one aspherical, or two apparent surfaces can be aspherical.First camera lens 100 is in the camera lens of lens system is configured like
There can be maximum optical power, and there can be the semiaperture of semiaperture that is maximum or being slightly less than three-lens 300.
Second camera lens 200 has negative refractive power, and can have bi-concave shape.Second camera lens 200 can have at least one
It is aspherical, or two apparent surfaces can be aspherical.Second camera lens can have minimum in the camera lens for be configured like lens system
Semiaperture.
Three-lens 300 has negative refractive power or positive refractive power, and is formed as being convex to the meniscus of plane of delineation IMG sides
Shape.Three-lens 300 can have at least one aspherical, or two apparent surfaces can be aspherical.
Second camera lens 200 and three-lens 300 may act as corrective lens, and various pictures can be corrected by using aspherical
Difference.
Diaphragm ST may be provided between the first camera lens 100 and the second camera lens 200.However, diaphragm ST position not limited to this.
First camera lens 100, the second camera lens 200 and three-lens 300 can be molded of plastic material；However, the present invention is unlimited
In this, and the first camera lens 100, the second camera lens 200 and three-lens 300 can be formed by glass material.If using plastic material,
So manufacturing cost can drop below the situation using glass material.
Saturating infrared ray (IR) optical filter 400 may be provided between three-lens 300 and plane of delineation IMG.Saturating IR optical filters
The light of the nearly IR wave bands of 400 transmissives (for example, about 800 nanometers to about 950 nanometers wave band).
Such as the imaging sensor such as charge coupled device (CCD) or complementary metal oxide semiconductor (CMOS) (not shown)
It may be provided at plane of delineation IMG.
Hereinafter, it will be described in lens data according to an embodiment of the invention.In lens data, S represents surface
Numbering, ST represent diaphragm, and R represents radius of curvature, and T represents thickness or distance, and Nd represents refractive index, and Vd represents Abbe number.This
Outside, Fno. represents F-number, and f represents the focal length of imaging lens system.R, T and f can millimeter be that unit represents, and mark
Surface number be 2-3 and 5-10 after * represent surface be aspherical.
It can be defined as below aspherical in embodiments of the invention.
Herein, Z represents the summit distance on optical axis with camera lens, and Y is represented on the direction perpendicular to optical axis
Distance, K represent the constant of the cone, and A, B, C, D, E, F, G, H and J represent asphericity coefficient, and R is the curvature half of the apex of camera lens
Footpath.
<First embodiment>
Fig. 1 shows the optical arrangement of the imaging lens system according to the first embodiment of the present invention.The imaging of the present embodiment
Lens system includes：First camera lens 100, there is positive refractive power；Second camera lens 200, there is negative refractive power；And three-lens
300, there is negative refractive power.The lens data of first embodiment is as described below.
【Table 1】
Fno.=2.8, f=3.960
| S | R | T | Nd | Vd |
| OBJ | It is infinitely great | |||
| 2* | 0.9953 | 0.6971 | 1.5238 | 55.7282 |
| 3* | 4.3884 | 0.1000 | ||
| ST | It is infinitely great | 0.6053 | ||
| 5* | -2.6292 | 0.2500 | 1.5238 | 55.7282 |
| 6* | 3.5273 | 0.3233 | ||
| 7* | -2.5964 | 0.2500 | 1.5238 | 55.7282 |
| 8* | -5.2291 | 0.7000 | ||
| 9 | It is infinitely great | 0.3000 | 1.5098 | 64.1664 |
| 10 | It is infinitely great | 0.2243 | ||
| IMG | It is infinitely great | 0.000 |
Asphericity coefficient is as described below.
【Table 2】
| S | 2 | 3 | 5 | 6 | 7 | 8 |
| K | -0.5172 | 1.7691 | 0 | 27.1168 | -68.1045 | -53.8644 |
| A | 0.0483 | 0.0331 | -0.2962 | -0.0624 | -0.9133 | -0.3253 |
| B | 0.0311 | 8.33E-05 | 0.3188 | 0.4151 | 2.3141 | 0.5406 |
| C | 0.062 | 0.3567 | -1.9411 | 0.2819 | -4.5741 | -0.661 |
| D | -0.0194 | -0.4799 | - | -1.648 | 5.9859 | 0.4342 |
| E | 0.0143 | -1.3859 | - | 4.2046 | - | 0.1089 |
| F | 0.0901 | 0.5403 | - | - | - | - |
| G | 0.0034 | 8.4537 | - | - | - | - |
| H | -0.2013 | 10.6153 | - | - | - | - |
| J | 0.273 | -40.1114 | - | - | - | - |
Fig. 2 shows longitudinal spherical aberration, the astigmatism curvature of field line of the imaging lens system according to the first embodiment of the present invention
And distortion.
Be 872 nanometers on wavelength, the light of 852 nanometers and 832 nanometers show longitudinal spherical aberration, astigmatism curvature of field line and
Distortion.In astigmatism curvature of field line, T1, T2 and T3 represent the curvature on three wavelength on tangential surface, and S1, S2 and S3
Represent the curvature on three wavelength on sagittal surface.
<Second embodiment>
The optical arrangement of the imaging lens system of Fig. 3 displayings according to the second embodiment of the present invention.The imaging of the present embodiment
Lens system includes：First camera lens 100, there is positive refractive power；Second camera lens 200, there is negative refractive power；And three-lens
300, there is negative refractive power.The lens data of second embodiment is as described below.
【Table 3】
Fno.=2.80, f=3.9218
| S | R | T | Nd | Vd |
| OBJ | It is infinitely great | |||
| 2* | 1.1222 | 0.5783 | 1.5238 | 55.7282 |
| 3* | 5.9518 | 0.1000 | ||
| ST | It is infinitely great | 0.7752 | ||
| 5* | -16.6151 | 0.3000 | 1.5238 | 55.7282 |
| 6* | 3.8934 | 0.4076 | ||
| 7* | -1.4848 | 0.3000 | 1.5238 | 55.7282 |
| 8* | -5.6772 | 0.3833 | ||
| 9 | It is infinitely great | 0.3000 | 1.5098 | 64.1664 |
| 10 | It is infinitely great | 0.3455 | ||
| IMG | It is infinitely great | 0.000 |
Asphericity coefficient is as described below.
【Table 4】
| S | 2 | 3 | 5 | 6 | 7 | 8 |
| K | -0.4776 | 34.0241 | 0 | 39.5785 | -30.8059 | 50.4284 |
| A | 0.0664 | 0.0621 | -0.0969 | -0.0968 | -1.112 | 0.0176 |
| B | -0.0588 | -0.191 | -0.7016 | 0.2877 | 2.4774 | 0.1039 |
| C | 0.0454 | 0.3434 | 3.6333 | -3.0536 | 4.9918 | -0.7262 |
| D | 0.117 | -0.0042 | -8.6453 | -0.9775 | -7.4794 | 0.6756 |
| E | 0.0795 | -0.5469 | -34.7736 | 3.0313 | 5.7582 | -0.2405 |
| F | -0.0911 | -0.3325 | 26.2057 | 25.0121 | -13.0947 | -1.2009 |
| G | -0.2844 | 1.8251 | 274.6955 | 29.7051 | -0.7429 | 1.3057 |
| H | -0.2062 | 4.0783 | 680.4705 | -54.1308 | -76.9685 | 6.3083 |
| J | 0.6225 | -10.4814 | -2837.6044 | -425.7552 | 0.1259 | -6.2813 |
Longitudinal spherical aberration, the astigmatism curvature of field line of the imaging lens system of Fig. 4 displayings according to the second embodiment of the present invention
And distortion.
Be 872 nanometers on wavelength, the light of 852 nanometers and 832 nanometers show longitudinal spherical aberration, astigmatism curvature of field line and
Distortion.In astigmatism curvature of field line, T1, T2 and T3 represent the curvature on three wavelength on tangential surface, and S1, S2 and S3
Represent the curvature of three wavelength on sagittal surface.
<3rd embodiment>
The optical arrangement of the imaging lens system of Fig. 5 displayings according to the third embodiment of the invention.The imaging of the present embodiment
Lens system includes：First camera lens 100, there is positive refractive power；Second camera lens 200, there is negative refractive power；And three-lens
300, there is positive refractive power.The lens data of 3rd embodiment is as described below.
【Table 5】
Fno.=2.71, f=3.9983
| S | R | T | Nd | Vd |
| OBJ | It is infinitely great | |||
| 2* | 1.0264 | 0.6918 | 1.5238 | 55.7282 |
| 3* | 5.0664 | 0.1000 | ||
| ST | It is infinitely great | 0.7128 | ||
| 5* | -1.9478 | 0.2500 | 1.5238 | 55.7282 |
| 6* | 3.0245 | 0.6457 | ||
| 7* | -5.2802 | 0.3164 | 1.5238 | 55.7282 |
| 8* | -5.3384 | 0.3833 | ||
| 9 | It is infinitely great | 0.3000 | 1.5098 | 64.1664 |
| 10 | It is infinitely great | 0.1000 | ||
| IMG | It is infinitely great | 0.000 |
Asphericity coefficient is as described below.
【Table 6】
Longitudinal spherical aberration, the astigmatism curvature of field line of the imaging lens system of Fig. 6 displayings according to the third embodiment of the invention
And distortion.
Be 872 nanometers on wavelength, the light of 852 nanometers and 832 nanometers show longitudinal spherical aberration, astigmatism curvature of field line and
Distortion.In astigmatism curvature of field line, T1, T2 and T3 represent the curvature of three wavelength on tangential surface, and S1, S2 and S3 are represented
The curvature on three wavelength on sagittal surface.
Following table shows the lens data related to the above-mentioned condition 1 to 4 in each embodiment, and shows that lens data meets
Above-mentioned condition 1 to 4.
【Table 7】
| First embodiment | Second embodiment | 3rd embodiment | |
| θ | 28.04 | 28.4 | 28.4 |
| tanθ | 0.54 | 0.54 | 0.54 |
| Condition 1 | 0.54 | 0.54 | 0.54 |
| D1 | 0.8 | 0.79 | 0.81 |
| f | 3.96 | 3.92 | 4 |
| Condition 2 | 4.95 | 4.96 | 4.94 |
| TTL | 3.45 | 3.49 | 3.5 |
| f | 3.96 | 3.92 | 4 |
| Condition 3 | 0.87 | 0.89 | 0.88 |
| D1 | 0.8 | 0.79 | 0.81 |
| D3 | 0.7 | 0.77 | 0.84 |
| Condition 4 | 1.14 | 1.03 | 0.96 |
Imaging lens system can be configured with excellent optical performance and small-sized and light-duty light by using three camera lenses
System.
Because imaging lens system can be at least one surface of camera lens using aspherical, aberration is readily available
Correction, and manufacturing cost can be due to being reduced using plastic material.
According to an embodiment of the invention, the imaging lens with excellent optical performance and small-sized and light-duty structure be can configure
System.The imaging lens system of the present invention can be used for having is converted to electric signal by the optical imagery formed by imaging lens system
Imaging sensor various imaging devices in.
And imaging lens system can be used for carrying out sensing movement by using the light of nearly IR wave bands, and can be used for needing to move
In the various electronic installations and mancarried device that sense performance.
Although specifically show and describe the present invention, the technology of art with reference to the one exemplary embodiment of the present invention
Personnel should be understood that can be to the present invention in the case where not departing from the spirit and scope of the present invention being defined by the appended claims
Make the various changes of form and details.
Claims (14)
1. a kind of imaging lens system, it is characterised in that sequentially include from thing side to plane of delineation side：
First camera lens, there is positive refractive power；
Second camera lens, there is negative refractive power；And
Three-lens, there is positive refractive power or negative refractive power, wherein the view angle theta of the imaging lens system meets following condition,
0.7<|tanθ|<1.5
Wherein described imaging lens system also meets following condition：4.8<f/D1<5.0
Wherein f represents the focal length of the imaging lens system, and D1 is the semiaperture of first camera lens at the thing side.
2. imaging lens system according to claim 1, wherein the imaging lens system also meets following condition：0.7<
TTL/f<1.2
Wherein TTL represents the distance from the thing side surface of first camera lens to described image plane, and f represents the imaging lens
The focal length of head system.
3. imaging lens system according to claim 1, wherein the imaging lens system also meets following condition：1.95
<D1/D3<1.5
Wherein D1 represents the semiaperture of first camera lens at the thing side, and D3 represents described at described image planar side
The semiaperture of three-lens.
4. imaging lens system according to claim 1, wherein second camera lens is in first camera lens, described second
There is minimum semiaperture in camera lens and the three-lens.
5. imaging lens system according to claim 1, wherein first camera lens has the bent moon for being convex to the thing side
Face shape.
6. imaging lens system according to claim 1, wherein second camera lens has bi-concave shape.
7. imaging lens system according to claim 1, wherein the three-lens, which has, is convex to described image planar side
Meniscus shape.
8. imaging lens system according to claim 1, wherein first camera lens have it is at least one aspherical.
9. imaging lens system according to claim 1, wherein second camera lens have it is at least one aspherical.
10. imaging lens system according to claim 1, wherein the three-lens have it is at least one aspherical.
11. imaging lens system according to claim 1, wherein first camera lens, second camera lens and described
Three-lens is molded of plastic material.
12. imaging lens system according to claim 1, wherein diaphragm are arranged on first camera lens and second mirror
Between head.
13. imaging lens system according to claim 1, wherein saturating infrared filter be arranged on the three-lens with
Between the plane of delineation.
A kind of 14. imaging device, it is characterised in that including：
Imaging lens system as claimed in claim 1；And
Imaging sensor, for the optical imagery formed by the imaging lens system to be converted into electric signal.
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| CN105807402B (en) * | 2016-06-02 | 2019-02-01 | 厦门颉轩光电有限公司 | A kind of near-infrared optical lens group |
| CN106990512B (en) * | 2017-05-26 | 2022-09-30 | 浙江舜宇光学有限公司 | Iris lens |
| CN111273431B (en) * | 2018-12-04 | 2021-11-16 | 新巨科技股份有限公司 | Three-piece infrared wavelength projection lens set |
| CN109870787B (en) * | 2019-03-20 | 2020-11-17 | 江西联益光学有限公司 | Optical imaging lens |
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| JP2007094278A (en) * | 2005-09-30 | 2007-04-12 | Fujinon Corp | Lens for image reading and image reader |
| JP2011242414A (en) * | 2010-05-14 | 2011-12-01 | Optical Logic Inc | Imaging lens |
| JP2014074814A (en) * | 2012-10-04 | 2014-04-24 | Nikon Corp | Ocular optical system, optical device, and observation method |
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| JP2002048985A (en) * | 2000-08-02 | 2002-02-15 | Minolta Co Ltd | Eyepiece optical system |
| TWI427355B (en) * | 2011-02-23 | 2014-02-21 | Largan Precision Co Ltd | Wide viewing angle optical lens assembly |
| TWI483029B (en) * | 2012-02-10 | 2015-05-01 | Largan Precision Co Ltd | Photographing lens system |
| KR101570030B1 (en) * | 2013-12-24 | 2015-11-19 | 주식회사 코렌 | Photographic lens optical system |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007094278A (en) * | 2005-09-30 | 2007-04-12 | Fujinon Corp | Lens for image reading and image reader |
| JP2011242414A (en) * | 2010-05-14 | 2011-12-01 | Optical Logic Inc | Imaging lens |
| JP2014074814A (en) * | 2012-10-04 | 2014-04-24 | Nikon Corp | Ocular optical system, optical device, and observation method |
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