CN207473183U - A kind of short TTL camera lenses of big field angle - Google Patents
A kind of short TTL camera lenses of big field angle Download PDFInfo
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- CN207473183U CN207473183U CN201721431004.0U CN201721431004U CN207473183U CN 207473183 U CN207473183 U CN 207473183U CN 201721431004 U CN201721431004 U CN 201721431004U CN 207473183 U CN207473183 U CN 207473183U
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Abstract
A kind of big short TTL camera lenses of field angle of the utility model, including aperture diaphragm, 4 lens and optical filter, first lens and third piece lens have a positive light coke, and second lens and the 4th lens have a negative power, and the object side optical surface and image side optical surface of second lens are concave surface；The object side optical surface of third piece lens is concave surface, and image side optical surface is convex surface；4th lens are in terms of the lateral image side of object in M shapes；Meet the following conditions：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 third piece lens, d3For the air gap between third piece lens and the 4th lens, T1To T4For the center thickness of 4 lens, ih is maximum image height.The camera lens of the utility model, in short TTL, high brightness, big visual field, hi-vision parsing power aspect is with good performance.
Description
Technical field
The utility model is related to be suitable for high pixel smart mobile phone or thin video camera shooting electronic equipment more particularly to one kind
The short TTL camera lenses of big field angle.
Background technology
With the development of science and technology, various portable electronic devices tend to the direction to increasingly miniaturization, lighting
Development, wherein the mancarried electronic aid with camera function such as smart mobile phone, tablet computer, smartwatch, AR glasses etc. are to taking the photograph
As camera lens requirement is 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 of 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 the piece number is unfavorable for correcting less
Marginal aberration.There are many patents to be suggested about 4 slice structures, though having optics overall length in existing patent is less than 3.4mm
Structure, but visual field is generally between 60 °~80 °.In short TTL, high brightness, big visual field, hi-vision parsing power aspect performance
It is bad.
Utility model content
The utility model embodiment provides a kind of big short TTL camera lenses of field angle, in short TTL, high brightness, big visual field, Gao Tu
As there is good performance in terms of parsing power.
The utility model provides a kind of big short TTL camera lenses of field angle, including being arranged along optical axis by object side to image side successively
The aperture diaphragm of setting, 4 lens and optical filter, first lens and third piece lens have a positive light coke, and described the
Two lens and the 4th lens have negative power, and the object side optical surface and image side optical surface of second lens are all recessed
Face；The third piece lens are in falcate, and the object side optical surface of third piece lens is concave surface, and image side optical surface is convex surface；It is described
4th lens are in M shapes from the lateral image side of object；And it satisfies the following conditional expression：
Wherein, d1For the air gap between first lens and second lens, d2For second lens and third piece lens
Between the air gap, d3For the air gap between third piece lens and the 4th lens, T1、T2、T3And T4Respectively first thoroughly
Mirror, second lens, third piece lens and the 4th lens center thickness, ih is maximum image height.
In the short TTL camera lenses of big field angle of the utility model, the lens of the camera lens satisfy the following conditional expression：1.2<
d1/d2<1.7。
In the short TTL camera lenses of big field angle of the utility model, second lens and third piece lens satisfaction are following
Conditional：0.2<t2/t3<0.5。
In the short TTL camera lenses of big field angle of the utility model, second lens satisfy the following conditional expression：N2>
1.64, wherein N2Refractive index for second lens.
In the short TTL camera lenses of big field angle of the utility model, second lens satisfy the following conditional expression：
-3.8<f2/f<-2.5；
Wherein, f2For the focal length of second lens, f is the focal length of the entire optical system of camera lens；R3And R4Respectively second
The radius of curvature of lens object side optical surface and image side optical surface.
In the short TTL camera lenses of big field angle of the utility model, the 4th lens satisfy the following conditional expression：
-1.2<f4/f<-0.3；
Wherein, f4For the focal length of the 4th lens, f is the focal length of the entire optical system of camera lens；R7And R8Respectively the 4th
The radius of curvature of lens object side optical surface and image side optical surface.
In the short TTL camera lenses of big field angle of the utility model, each face of lens of the camera lens uses even aspheric surface.
A kind of big short TTL camera lenses of field angle of the utility model have at least following advantageous effect：
1st, the mobile lens of the utility model are in short TTL, high brightness, big visual field, have in terms of hi-vision parsing power good
Performance.
2nd, the lens shape of the optical system of the camera lens of the utility model is more well-balanced, is produced convenient for molding.And eyeglass
Spacing is reasonable, convenient for the structure design in later stage.
3rd, the MTF transfer curves figure (optical transfer function) of the optical system of the utility model camera lens, can integrate
The image quality of reflection system, curve shape is more smooth, and the height of opposite X-axis is higher, it was demonstrated that the image quality of system is got over
Good, for this optical system lens when spatial frequency is 110lp/mm, MTF is more than 0.4 within 0.9 visual field, has higher image
Analytic ability.The curvature of field of this system corrects fine, and each visual field distortion is also controlled within 2%.
Description of the drawings
Fig. 1 is the X-Y scheme of the optical system of the short TTL camera lenses of big field angle of the utility model；
Fig. 2 is the MTF transfer curve figures of the optical system of the short TTL camera lenses of big field angle of the utility model；
Fig. 3 is the curvature of field figure of the optical system of the short TTL camera lenses of big field angle of the utility model；
Fig. 4 is the distortion characteristics curve graph of the optical system of the short TTL camera lenses of big field angle of the utility model；
Fig. 5 is the defocusing curve figure of the optical system of the short TTL camera lenses of big field angle of the utility model.
Specific embodiment
The utility model provides a kind of big short TTL camera lenses of field angle, and the X-Y scheme of optical system is as shown in Figure 1, the mirror
Head, including set gradually along optical axis arrangement by object side to image side aperture diaphragm, first lens, 1, second lens 2, the
Three pieces lens 3, the 4th lens 4 and optical filter 5.First lens 1 and third piece lens 3 have positive light coke, described
Second lens 2 and the 4th lens 4 have negative power, the object side optical surface and image side optical surface of second lens 2
All it is concave surface；The third piece lens 3 are in falcate, and the object side optical surface of third piece lens 3 is concave surface, and image side optical surface is convex
Face；4th lens 4 are in M shapes from the lateral image side of object.And it satisfies the following conditional expression：
1.2<d1/d2<1.7 (1)
0.2<t2/t3<0.5 (2)
N2>1.64 (3)
-3.8<f2/f<-2.5 (4)
-1.2<f4/f<-0.3 (6)
Wherein, d1For the air gap between first lens and second lens, d2For second lens and third piece lens
Between the air gap, d3For the air gap between third piece lens and the 4th lens, T1、T2、T3And T4Respectively first thoroughly
Mirror, second lens, third piece lens and the 4th lens center thickness, ih is maximum image height.f2For second lens
Focal length, f are the focal length of entire optical system；R3And R4The respectively curvature of second lens object side optical surface and image side optical surface
Radius.f4For the focal length of the 4th lens, f is the focal length of entire optical system；R7And R8Respectively the 4th lens object 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
If the ratio between the air gap between three pieces lens more than lower limiting value, although being conducive to minimize, is unfavorable for spherical aberration corrector and field
It is bent.If it is unfavorable for minimizing more than upper limit value.
Above-mentioned condition formula (2) defines the ratio between second lens and third piece lens center thickness, and meeting this conditional has
Conducive to the correction curvature of field.
Meet conditional (3) and be conducive to spherical aberration corrector and aberration.
Conditional (4)~(7) define second lens and the 4th power of lens and each face bending degree relationship,
Meet this relational expression and be conducive to the reasonable distribution of focal power and reach shortening overall length, increase visual field, control aberration reaches actual use
It is required that purpose.
Conditional (8)~(9) limit the relationship of eyeglass gap, thickness and image height, meet this relational expression and ensure that high picture
The ultrathin of whole system while plain.
Each face of lens of the utility model camera lens 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 big field angle of the utility model, TTL control in 3.4mm hereinafter,
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 is convenient for 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
Front end is to the distance of image planes) for 3.36mm, image height and the optical system that TTL ratios are 0.71.
Design parameter table of the table 1 for the camera lens of embodiment 1.
Asphericity coefficient table of the table 2 for the camera lens of embodiment 1.
| Face serial 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 for 1.41, t in conditional (2)2/t3Value for 0.37, f in conditional (4)2/ f's
It is -3.28 to be worth, (R in conditional (5)3- R4)/(R3+R4) value for 2.95, f in conditional (6)4The value of/f is -0.83, condition
(R in formula (7)7-R8)/(R7+R8) value for 0.5, (d in conditional (8)1+d2+d3The value of)/ih is 0.22, in conditional (9)
(T1+T2+T3+T4The value of)/ih 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 given birth to convenient for molding
Production.And eyeglass spacing is reasonable, convenient for the structure design in later stage.
As shown in Fig. 2, be the MTF transfer curves figure (optical transfer function) of optical system, it can be with concentrated expression system
The image quality of system, curve shape is more smooth, and the height of opposite 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 curvature of field figure and the distortion characteristics curve of optical system respectively, the curvature of field of this 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.
The above is only the preferred embodiment of the present invention, the thought being not intended to limit the utility model, it is all
Within the spirit and principles of the utility model, it is new to should be included in this practicality for any modification, equivalent replacement, improvement and so on
Within the protection domain of type.
Claims (7)
1. a kind of short TTL camera lenses of big field angle, which is characterized in that including what is set gradually along optical axis arrangement by object side to image side
Aperture diaphragm, 4 lens and optical filter, 4 lens include first lens, second lens, third piece lens and the
Four lens, first lens and third piece lens have positive light coke, second lens and the 4th lens tool
There is negative power, the object side optical surface and image side optical surface of second lens are all concave surface；The third piece lens are in curved
Month shape, the object side optical surface of third piece lens is concave surface, and image side optical surface is convex surface；4th lens are from the lateral image side of object
Observation is in M shapes；And it satisfies the following conditional expression：
Wherein, d1For the air gap between first lens and second lens, d2Between second lens and third piece lens
The air gap, d3For the air gap between third piece lens and the 4th lens, T1、T2、T3And T4Respectively first lens,
The center thickness of two lens, third piece lens and the 4th lens, ih are maximum image height.
2. the short TTL camera lenses of big field angle as described in claim 1, which is characterized in that the lens of the camera lens meet following item
Part formula：1.2<d1/d2<1.7。
3. the short TTL camera lenses of big field angle as described in claim 1, which is characterized in that second lens and third piece are saturating
Mirror satisfies the following conditional expression：0.2<t2/t3<0.5。
4. the short TTL camera lenses of big field angle as described in claim 1, which is characterized in that second lens meet following item
Part formula：N2>1.64, wherein N2Refractive index for second lens.
5. the short TTL camera lenses of big field angle as described in claim 1, which is characterized in that second lens meet following item
Part formula：
-3.8<f2/f<-2.5；
Wherein, f2For the focal length of second lens, f is the focal length of the entire optical system of camera lens；R3And R4Respectively second lens
The radius of curvature of object side optical surface and image side optical surface.
6. the short TTL camera lenses of big field angle as described in claim 1, which is characterized in that the 4th lens meet following article
Part formula：
-1.2<f4/f<-0.3；
Wherein, f4For the focal length of the 4th lens, f is the focal length of the entire optical system of camera lens；R7And R8Respectively the 4th lens
The radius of curvature of object side optical surface and image side optical surface.
7. the short TTL camera lenses of big field angle as described in claim 1, which is characterized in that each face of lens of the camera lens is using even
It is secondary aspherical.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107870409A (en) * | 2017-11-01 | 2018-04-03 | 辽宁中蓝电子科技有限公司 | A kind of short TTL camera lenses of the big angle of visual field |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107870409A (en) * | 2017-11-01 | 2018-04-03 | 辽宁中蓝电子科技有限公司 | A kind of short TTL camera lenses of the big angle of visual field |
| CN107870409B (en) * | 2017-11-01 | 2023-11-24 | 辽宁中蓝光电科技有限公司 | Short TTL lens of big angle of view |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20201201 Address after: 124000 No. 388 North China Road, Xinglongtai District, Panjin City, Liaoning Province Patentee after: Liaoning Zhonglan Photoelectric Technology Co.,Ltd. Address before: 124010 Zhonghua Road East, Xinglongtai District, Liaoning, Panjin Patentee before: LIAONING ZHONGLAN ELECTRONIC TECHNOLOGY Co.,Ltd. |
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| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: A large field angle short TTL lens Effective date of registration: 20210726 Granted publication date: 20180608 Pledgee: China Construction Bank Corporation Panjin branch Pledgor: Liaoning Zhonglan Photoelectric Technology Co.,Ltd. Registration number: Y2021210000049 |