CN107870409A - A kind of short TTL camera lenses of the big angle of visual field - Google Patents
A kind of short TTL camera lenses of the big angle of visual field Download PDFInfo
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- CN107870409A CN107870409A CN201711052720.2A CN201711052720A CN107870409A CN 107870409 A CN107870409 A CN 107870409A CN 201711052720 A CN201711052720 A CN 201711052720A CN 107870409 A CN107870409 A CN 107870409A
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- 230000000007 visual effect Effects 0.000 title claims abstract description 41
- 230000003287 optical effect Effects 0.000 claims abstract description 60
- 239000000571 coke Substances 0.000 claims abstract description 4
- 230000004075 alteration Effects 0.000 description 5
- 238000012546 transfer Methods 0.000 description 5
- 238000013461 design Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000010191 image analysis Methods 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000009740 moulding (composite fabrication) Methods 0.000 description 1
- 235000012149 noodles Nutrition 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/004—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having four lenses
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
Abstract
A kind of big short TTL camera lenses of the angle of visual field of the present invention, including aperture diaphragm, 4 lens and optical filter, first lens and the 3rd lens have a positive light coke, and second lens and the 4th lens have a negative power, and the thing side optical surface and image side optical surface of second lens are concave surface；The thing side optical surface of 3rd lens is concave surface, and image side optical surface is convex surface；4th lens are in terms of the lateral image side of thing in M shapes；Meet following condition：0.2<(d1+d2+d3)/ih<0.4,0.5<(T1+T2+T3+T4)/ih<0.8；d1For the air gap between first lens and second lens, d2For the air gap between second lens and the 3rd lens, d3For the air gap between the 3rd lens and the 4th lens, T1To T4For the center thickness of 4 lens, ih is maximum image height.The camera lens of the present invention, there is good performance at short TTL, high brightness, big visual field, hi-vision parsing power aspect.
Description
Technical field
The present invention relates to regarded greatly suitable for high pixel smart mobile phone or thin video shooting electronic equipment, more particularly to one kind
The short TTL camera lenses in rink corner.
Background technology
With the development of science and technology, various portable electric appts tend to the direction to increasingly miniaturization, lighting
Development, wherein the mancarried electronic aid with camera function such as smart mobile phone, tablet personal computer, intelligent watch, AR glasses etc. are to taking the photograph
Picture camera lens requires shorter and shorter, while also requires high parsing power, high brightness, big visual field, low cost.
For these requirements, such as in order to be minimized, ultra-thin requirement, using 4 slice structures, because eyeglass piece number
It is more, difficulty can be increased in terms of short TTL (distance of eyeglass front end to image planes) ultrathin, but piece number is unfavorable for correcting less
Marginal aberration.There are many patents to be suggested on 4 slice structures, though existing optics overall length is less than 3.4mm in existing patent
Structure, but visual field is typically between 60 °~80 °.Showed at short TTL, high brightness, big visual field, hi-vision parsing power aspect
It is bad.
The content of the invention
The embodiment of the present invention provides a kind of big short TTL camera lenses of the angle of visual field, in short TTL, high brightness, big visual field, hi-vision solution
There is good performance in terms of analysis power.
The present invention provides a kind of big short TTL camera lenses of the angle of visual field, including arranges along optical axis and set gradually by thing side to image side
Aperture diaphragm, 4 lens and optical filter, first lens and the 3rd lens have a positive light coke, described second
Lens and the 4th lens have negative power, and the thing side optical surface and image side optical surface of second lens are all concave surface；
3rd lens are in falcate, and the thing side optical surface of the 3rd lens is concave surface, and image side optical surface is convex surface；Described 4th
Piece lens are in M shapes from the lateral image side of thing；And satisfy the following conditional expression：
Wherein, d1For the air gap between first lens and second lens, d2For second lens and the 3rd lens
Between the air gap, d3For the air gap between the 3rd lens and the 4th lens, T1、T2、T3And T4Respectively first thoroughly
Mirror, second lens, the center thickness of the 3rd lens and the 4th lens, ih is maximum image height.
In the short TTL camera lenses of the big angle of visual field of the present invention, the lens of the camera lens satisfy the following conditional expression：1.2<d1/d2<
1.7。
In the short TTL camera lenses of the big angle of visual field of the present invention, second lens and the 3rd lens meet following condition
Formula：0.2<t2/t3<0.5。
In the short TTL camera lenses of the big angle of visual field of the present invention, second lens satisfy the following conditional expression：N2>1.64 its
Middle N2For the refractive index of second lens.
In the short TTL camera lenses of the big angle of visual field of the present invention, second lens satisfy the following conditional expression：
-3.8<f 2/f<-2.5；
Wherein, f2For the focal length of second lens, f is the focal length of the whole optical system of camera lens；R3And R4Respectively second
The radius of curvature of lens thing side optical surface and image side optical surface.
In the short TTL camera lenses of the big angle of visual field of the present invention, the 4th lens satisfy the following conditional expression：
-1.2<f 4/f<-0.3；
Wherein, f4For the focal length of the 4th lens, f is the focal length of the whole optical system of camera lens；R7And R8Respectively the 4th
The radius of curvature of lens thing side optical surface and image side optical surface.
In the short TTL camera lenses of the big angle of visual field of the present invention, each face of lens of the camera lens uses even aspheric surface.
A kind of big short TTL camera lenses of the angle of visual field of the present invention, have at least following beneficial effect：
1st, mobile lens of the invention have good table at short TTL, high brightness, big visual field, hi-vision parsing power aspect
It is existing.
2nd, the lens shape of the optical system of camera lens of the invention is more well-balanced, is easy to shaping to produce.And eyeglass spacing
Rationally, it is easy to the structure design in later stage.
3rd, the MTF transfer curves figure (optical transfer function) of the optical system of camera lens of the present invention, can be with concentrated expression
The image quality of system, its curve shape is more smooth, and the height of relative X-axis is higher, it was demonstrated that and the image quality of system is better, this
For optical system lens when spatial frequency is 110lp/mm, MTF is more than 0.4 within 0.9 visual field, has higher image analysis energy
Power.The curvature of field of the system is corrected fine, and each visual field distortion is also controlled within 2%.
Brief description of the drawings
Fig. 1 is the X-Y scheme of the optical system of the short TTL camera lenses of the big angle of visual field of the present invention；
Fig. 2 is the MTF transfer curve figures of the optical system of the short TTL camera lenses of the big angle of visual field of the present invention；
Fig. 3 is the curvature of field figure of the optical system of the short TTL camera lenses of the big angle of visual field of the present invention；
Fig. 4 is the distortion characteristics curve map of the optical system of the short TTL camera lenses of the big angle of visual field of the present invention；
Fig. 5 is the defocusing curve figure of the optical system of the short TTL camera lenses of the big angle of visual field of the present invention.
Embodiment
The present invention provides a kind of big short TTL camera lenses of the angle of visual field, and the X-Y scheme of its optical system is as shown in figure 1, the camera lens, bag
Include along optical axis arrangement set gradually by thing side to image side aperture diaphragm, first lens, 1, second lens 2, the 3rd thoroughly
Mirror 3, the 4th lens 4 and optical filter 5.First lens 1 and the 3rd lens 3 have a positive light coke, described second
Lens 2 and the 4th lens 4 have negative power, and the thing side optical surface and image side optical surface of second lens 2 are all to be recessed
Face；3rd lens 3 are in falcate, and the thing side optical surface of the 3rd lens 3 is concave surface, and image side optical surface is convex surface；Institute
It is in M shapes from the lateral image side of thing to state the 4th lens 4.And satisfy the following conditional expression：
1.2<d1/d2<1.7 (1)
0.2<t2/t3<0.5 (2)
N2>1.64 (3)
-3.8<f 2/f<-2.5 (4)
-1.2<f 4/f<-0.3 (6)
Wherein, d1For the air gap between first lens and second lens, d2For second lens and the 3rd lens
Between the air gap, d3For the air gap between the 3rd lens and the 4th lens, T1、T2、T3And T4Respectively first thoroughly
Mirror, second lens, the center thickness of the 3rd lens and the 4th lens, ih is maximum image height.f2For second lens
Focal length, f are the focal length of whole optical system；R3And R4The respectively curvature of second lens thing side optical surface and image side optical surface
Radius.f4For the focal length of the 4th lens, f is the focal length of whole optical system；R7And R8Respectively the 4th lens thing sidelight
Face and the radius of curvature of image side optical surface.
Above-mentioned condition formula (1) defines the air gap between first lens and second lens and second lens and the
The ratio between the air gap between three lens, if exceeding lower limit, although being advantageous to minimize, it is unfavorable for spherical aberration corrector and field
It is bent.If it is unfavorable for minimizing more than higher limit.
Above-mentioned condition formula (2) defines the ratio between second lens and the 3rd lens center thickness, meets that this conditional has
Beneficial to the correction curvature of field.
Meet that conditional (3) is advantageous to spherical aberration corrector and aberration.
Conditional (4)~(7) define second lens and the 4th power of lens and each face degree of crook relation,
Meet that this relational expression is advantageous to the reasonable distribution of focal power and reaches shortening overall length, increase visual field, control aberration reaches actual use
It is required that purpose.
Conditional (8)~(9) limit the relation of eyeglass gap, thickness and image height, meet that this relational expression ensure that high picture
The ultrathin of whole system while plain.
Each face of lens of camera lens of the present invention uses even aspheric surface.Each asphericity coefficient meets equation below：
Wherein, z represents aspherical rise, and c represents aspherical paraxial curvature, and y represents camera lens aperture, and k represents circular cone coefficient,
A4For 4 asphericity coefficients, A6For 6 asphericity coefficients, A8For 8 asphericity coefficients, A10For 10 asphericity coefficients, A12For
12 asphericity coefficients, A14For 14 asphericity coefficients, A16For 16 asphericity coefficients.
4 slice structure optical systems of the short TTL camera lenses of the big angle of visual field of the present invention, TTL controls are in below 3.4mm, maximum
Image height 2.4mm, full filed angle is less than 2.0 bright camera lens up to 87.5, Fno, and FBL (back work distance from) is more than 0.8mm just
In carrying IRCUT and imaging sensor.Lens structure is easy to mechanism design and processing and forming with face shape.
Embodiment 1：The full filed angle of camera lens is 87.6 in the present embodiment, f-number F2.0, optics overall length TTL (eyeglasses
Distance of the front end to image planes) it is 3.36mm, image height and the optical system that TTL ratios are 0.71.
Table 1 is the design parameter table of the camera lens of embodiment 1.
| Face sequence number | Noodles type | Radius of curvature | Thickness | Glass |
| STO | Sphere | It is infinitely great | -0.12 | |
| 2 | It is aspherical | 1.402525 | 0.454808 | 1.546:56.037 |
| 3 | It is aspherical | 18.13289 | 0.285623 | |
| 4 | It is aspherical | -16.331 | 0.22 | 1.656:21.514 |
| 5 | It is aspherical | 8.056201 | 0.201997 | |
| 6 | It is aspherical | -2.02512 | 0.595492 | 1.546:56.037 |
| 7 | It is aspherical | -0.73088 | 0.05 | |
| 8 | It is aspherical | 2.00549 | 0.426929 | 1.537:56.114 |
| 9 | It is aspherical | 0.661287 | 0.482603 | |
| 10 | Sphere | It is infinitely great | 0.21 | |
| 11 | Sphere | It is infinitely great | 0.43013 | |
| 12 | Sphere | It is infinitely great | 0 |
Table 2 is the asphericity coefficient table of the camera lens of embodiment 1.
| Face sequence number | K | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| STO | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| 2 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| 3 | -2.34958 | -0.00103 | 0.800541 | -8.54068 | 47.51957 | -147.683 | 239.9511 | -159.218 |
| 4 | 0 | -0.2639 | 0.409335 | -7.61976 | 47.48681 | -153.399 | 255.3138 | -170.122 |
| 5 | 108.2427 | -0.33512 | -0.2871 | -2.61324 | 24.25808 | -77.736 | 137.2071 | -99.7367 |
| 6 | 0 | -0.01065 | -0.70657 | 0.511509 | 5.697954 | -19.5177 | 30.12539 | -17.3886 |
| 7 | 4.633929 | 0.577251 | -1.07905 | 2.649663 | -6.83919 | 14.46522 | -17.5107 | 9.100885 |
| 8 | -4.7664 | -0.42193 | 1.322032 | -3.35997 | 5.930468 | -5.61586 | 2.653898 | -0.50353 |
| 9 | 0 | -0.38755 | 0.001595 | 0.285011 | -0.22585 | 0.080588 | -0.01415 | 0.000987 |
| 10 | -4.64385 | -0.24621 | 0.13699 | -0.07884 | 0.033829 | -0.00982 | 0.001629 | -0.00011 |
D in conditional (1)1/d2Value be 1.41, t in conditional (2)2/t3Value be 0.37, f in conditional (4)2/ f's
It is worth for -3.28, (R in conditional (5)3- R4)/(R3+R4) value be 2.95, f in conditional (6)4/ f value is -0.83, condition
(R in formula (7)7-R8)/(R7+R8) value be 0.5, (d in conditional (8)1+d2+d3)/ih value is 0.22, in conditional (9)
(T1+T2+T3+T4)/ih value is 0.71.
As shown in figure 1, it is the X-Y scheme of optical system.The lens shape of the optical system is more well-balanced, is easy to shaping to give birth to
Production.And eyeglass spacing is reasonable, it is easy to the structure design in later stage.
As shown in Fig. 2 be the MTF transfer curves figure (optical transfer function) of optical system, can be with concentrated expression system
The image quality of system, its curve shape is more smooth, and the height of relative X-axis is higher, it was demonstrated that the image quality of system is better, this light
For system camera lens when spatial frequency is 110lp/mm, MTF is more than 0.4 within 0.9 visual field, has higher image analysis energy
Power.
As shown in Figure 3 and Figure 4, it is the curvature of field figure and distortion characteristics curve of optical system respectively, the curvature of field of the system corrects
It is fine, the distortion of each visual field is also controlled within 2%.
As shown in figure 5, being the defocusing curve figure of optical system, represent that 0 visual field, 0.3 visual field, 0.5 visual field, 0.8 regard respectively
Field and the optical property and defocusing amount of 1.0 visual fields.Peak of curve distance center point is nearer, represents that optical property is better, place
It is smaller.
Presently preferred embodiments of the present invention is the foregoing is only, the thought being not intended to limit the invention is all the present invention's
Within spirit and principle, any modification, equivalent substitution and improvements made etc., it should be included in the scope of the protection.
Claims (7)
1. a kind of short TTL camera lenses of the big angle of visual field, it is characterised in that including what is set gradually along optical axis arrangement by thing side to image side
Aperture diaphragm, 4 lens and optical filter, first lens and the 3rd lens have positive light coke, and described second thoroughly
Mirror and the 4th lens have negative power, and the thing side optical surface and image side optical surface of second lens are all concave surface；Institute
It is in falcate to state the 3rd lens, and the thing side optical surface of the 3rd lens is concave surface, and image side optical surface is convex surface；Described 4th
Lens are in M shapes from the lateral image side of thing；And satisfy the following conditional expression：
<mrow>
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<mo><</mo>
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<msub>
<mi>d</mi>
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</msub>
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<mi>i</mi>
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</msub>
</mrow>
<mrow>
<mi>i</mi>
<mi>h</mi>
</mrow>
</mfrac>
<mo><</mo>
<mn>0.8</mn>
</mrow>
Wherein, d1For the air gap between first lens and second lens, d2Between second lens and the 3rd lens
The air gap, d3For the air gap between the 3rd lens and the 4th lens, T1、T2、T3And T4Respectively first lens,
The center thickness of two lens, the 3rd lens and the 4th lens, ih are maximum image height.
2. the short TTL camera lenses of the big angle of visual field as claimed in claim 1, it is characterised in that the lens of the camera lens meet following bar
Part formula：1.2<d1/d2<1.7。
3. the short TTL camera lenses of the angle of visual field as claimed in claim 1 big, it is characterised in that second lens and the 3rd are thoroughly
Mirror satisfies the following conditional expression：0.2<t2/t3<0.5。
4. the short TTL camera lenses of the big angle of visual field as claimed in claim 1, it is characterised in that second lens meet following bar
Part formula：N2>1.64, wherein N2For the refractive index of second lens.
5. the short TTL camera lenses of the big angle of visual field as claimed in claim 1, it is characterised in that second lens meet following bar
Part formula：
-3.8<f2/f<-2.5；
<mrow>
<mn>2.5</mn>
<mo><</mo>
<mfrac>
<mrow>
<msub>
<mi>R</mi>
<mn>3</mn>
</msub>
<mo>-</mo>
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</msub>
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<mn>4</mn>
</msub>
</mrow>
</mfrac>
<mo><</mo>
<mn>3.5</mn>
<mo>;</mo>
</mrow>
Wherein, f2For the focal length of second lens, f is the focal length of the whole optical system of camera lens；R3And R4Respectively second lens
The radius of curvature of thing side optical surface and image side optical surface.
6. the short TTL camera lenses of the big angle of visual field as claimed in claim 1, it is characterised in that the 4th lens meet following article
Part formula：
-1.2<f4/f<-0.3；
<mrow>
<mn>0.2</mn>
<mo><</mo>
<mfrac>
<mrow>
<msub>
<mi>R</mi>
<mn>7</mn>
</msub>
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</msub>
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<mn>7</mn>
</msub>
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<mn>8</mn>
</msub>
</mrow>
</mfrac>
<mo><</mo>
<mn>0.8</mn>
<mo>;</mo>
</mrow>
Wherein, f4For the focal length of the 4th lens, f is the focal length of the whole optical system of camera lens；R7And R8Respectively the 4th lens
The radius of curvature of thing side optical surface and image side optical surface.
7. the short TTL camera lenses of the big angle of visual field as claimed in claim 1, it is characterised in that each face of lens of the camera lens is using even
It is secondary aspherical.
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|---|---|---|---|
| CN201711052720.2A CN107870409B (en) | 2017-11-01 | 2017-11-01 | Short TTL lens of big angle of view |
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| CN107870409B CN107870409B (en) | 2023-11-24 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110205640A1 (en) * | 2008-05-28 | 2011-08-25 | Bo-Yuan Shih | Short Overall Length Imaging Lens System with Four Lenses |
| US20120224273A1 (en) * | 2011-03-04 | 2012-09-06 | Largan Precision Co., Ltd. | Photographing optical lens assembly |
| CN204178038U (en) * | 2014-06-27 | 2015-02-25 | 康达智株式会社 | Pick-up lens |
| JP2015161760A (en) * | 2014-02-27 | 2015-09-07 | アウラディアス合同会社 | imaging lens |
| CN207473183U (en) * | 2017-11-01 | 2018-06-08 | 辽宁中蓝电子科技有限公司 | A kind of short TTL camera lenses of big field angle |
-
2017
- 2017-11-01 CN CN201711052720.2A patent/CN107870409B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110205640A1 (en) * | 2008-05-28 | 2011-08-25 | Bo-Yuan Shih | Short Overall Length Imaging Lens System with Four Lenses |
| US20120224273A1 (en) * | 2011-03-04 | 2012-09-06 | Largan Precision Co., Ltd. | Photographing optical lens assembly |
| JP2015161760A (en) * | 2014-02-27 | 2015-09-07 | アウラディアス合同会社 | imaging lens |
| CN204178038U (en) * | 2014-06-27 | 2015-02-25 | 康达智株式会社 | Pick-up lens |
| CN207473183U (en) * | 2017-11-01 | 2018-06-08 | 辽宁中蓝电子科技有限公司 | A kind of short TTL camera lenses of big field angle |
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|---|---|
| CN107870409B (en) | 2023-11-24 |
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