CN105425366A - Image photographing optical lens group - Google Patents
Image photographing optical lens group Download PDFInfo
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- CN105425366A CN105425366A CN201511028804.3A CN201511028804A CN105425366A CN 105425366 A CN105425366 A CN 105425366A CN 201511028804 A CN201511028804 A CN 201511028804A CN 105425366 A CN105425366 A CN 105425366A
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- lens
- camera optical
- lens group
- optical lens
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- 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
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- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
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Abstract
The invention provides an image photographing optical lens group which belongs to the field of an optical lens. The image photographing optical lens group successively comprises the following components from the object side to the image side: a first lens with a positive refractive power, wherein the object-side surface of the first lens is a convex surface and the image-side surface is also a convex surface; a second lens with a negative refractive power, wherein the object-side surface of the second lens is a concave surface and the image-side surface is also a concave surface; a third lens with a positive refractive power, wherein the object-side surface of the third lens is a concave surface of the image-side surface is a convex surface; and a fourth lens with a negative refractive power, wherein the image-side surface of the fourth lens is a concave surface. The surfaces of the four lenses are aspheric. The parameters of the four lenses satisfy the following relational expressions: AC1<0.15mm, (f/f3)-(f-f1)<1, and the absolute value of f2/f*f1>0.5. The image photographing optical lens group has advantages of small deformation, high resolution and high uniformity of integral picture quality, and great imaging quality improvement. Furthermore on condition that the integral total length of the lens is unchanged, a photographable visual angle changes in a range of 65-90 DEG.
Description
Technical field
The present invention relates to field of optical lens, in particular to a kind of camera optical lens group.
Background technology
Optical lens is requisite parts in Vision Builder for Automated Inspection, directly affects the quality of image quality, affects realization and the effect of algorithm.Existing camera optical lens group generally adopts multiple lens combination to be formed, although can complete shooting, the deformation quantity of its imaging is large, and overall picture resolution is lower, and uniformity coefficient is poor, causes image quality poor.
Summary of the invention
The invention provides a kind of camera optical lens group, be intended to improve the problems referred to above.
The present invention is achieved in that
A kind of camera optical lens group, is sequentially comprised to image side by thing side:
First lens of the positive refracting power of one tool, its thing side surface is convex surface, and its surface, image side is convex surface;
One tool bears the second lens of refracting power, and its thing side surface is concave surface, and its surface, image side is concave surface;
3rd lens of the positive refracting power of one tool, its thing side surface is concave surface, and its surface, image side is convex surface;
One tool bears the 4th lens of refracting power, and its surface, image side is concave surface;
Wherein, the surface of described first lens, described second lens, described 3rd lens and described 4th lens is all aspheric surface;
Described camera optical lens group also comprises at least one filter element, and described filter element is arranged between described 4th lens and an imaging surface;
Total focal length of described camera optical lens group is f, and the focal length of described first lens is f1, and the focal length of described second lens is f2, and the focal length of described 3rd lens is f3, and the distance between described first lens and described second lens is AC1, and it meets following relationship:
AC1<0.15mm；
(f/f3)-(f/f1) <1; And,
Further, the center thickness of described second lens is TC2, and the center thickness of described 3rd lens is TC3, and it meets following relational expression:
1.12<TC3/TC2<2.5。
The thickness of the 3rd lens is greater than the thickness of the second lens, and the thickness of the 3rd lens is at least 1.12 times of the second lens thickness, and is less than 2.5 times.
Further, the center thickness of described 4th lens is TC4, and it meets following relational expression:
1<TC3/TC4<2.5。
The thickness of the 3rd lens is greater than the thickness of the 4th lens, and the thickness of the 3rd lens is at least 1 times of the 4th thickness, and is less than 2.5 times.
Further, the Abbe number of the material of described first lens is V1, and the Abbe number of the material of described second lens is V2, and the Abbe number of the material of described 3rd lens is V3, and the Abbe number of the material of described 4th lens is V4, and it meets following relational expression:
(V1+V2)/(V3+V4)<0.9。
Second lens adopt high-index material to make, and all the other lens all adopt the material of ordinary refractive index.
Further, described second lens adopt the material of refractive index index>1.6 to make.
Second lens adopt high-index material to make, its refractive index index>1.6.
Further, described first lens, described 3rd lens and described 4th lens all adopt the material of refractive index index<1.56 to make.
First lens, the 3rd lens and the 4th lens all adopt ordinary refractive index material to make, its refractive index index<1.56.The refractive index of optimal design lens, can ensure that the focal length of lens meets relational expression better, improves image quality.
Further, described first lens, described second lens, described 3rd lens and described 4th lens are all adopted made of plastic.
Further, described filter element is infrared filter.
Filter element adopts infrared filter, can leach infrared light.
Further, described infrared filter adopts glass to make.
Further, also comprise aperture, described aperture is arranged between thing side and described first lens.
Aperture is arranged between object and the first lens, effectively to lower optics total length.
The beneficial effect of camera optical lens group provided by the invention is: by designing the parameter such as thickness of the curvature of the second lens, Distance geometry the 3rd lens between the first lens and the second lens, make its numerical value meet relational expression:
AC1<0.15mm；
(f/f3)-(f/f1) <1; And,
Then can combine the camera optical lens group that the little and overall picture quality of deformation quantity reaches high-res and uniformity coefficient, substantially increase image quality, and under the constant condition of the overall total length of camera lens, can take visual angle can change between 65 ° ~ 90 °.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme of the embodiment of the present invention, be briefly described to the accompanying drawing used required in embodiment below, be to be understood that, the following drawings illustrate only some embodiment of the present invention, therefore the restriction to scope should be counted as, for those of ordinary skill in the art, under the prerequisite not paying creative work, other relevant accompanying drawings can also be obtained according to these accompanying drawings.
The structural representation of the camera optical lens group that Fig. 1 provides for first embodiment of the invention;
The astigmatism curve map of the camera optical lens group that Fig. 2 provides for first embodiment of the invention;
The distortion curve figure of the camera optical lens group that Fig. 3 provides for first embodiment of the invention;
The spherical aberration curve map of the camera optical lens group that Fig. 4 provides for first embodiment of the invention;
The structural representation of the camera optical lens group that Fig. 5 provides for second embodiment of the invention;
The astigmatism curve map of the camera optical lens group that Fig. 6 provides for second embodiment of the invention;
The distortion curve figure of the camera optical lens group that Fig. 7 provides for second embodiment of the invention;
The spherical aberration curve map of the camera optical lens group that Fig. 8 provides for second embodiment of the invention;
The structural representation of the camera optical lens group that Fig. 9 provides for third embodiment of the invention;
The astigmatism curve map of the camera optical lens group that Figure 10 provides for third embodiment of the invention;
The distortion curve figure of the camera optical lens group that Figure 11 provides for third embodiment of the invention;
The spherical aberration curve map of the camera optical lens group that Figure 12 provides for third embodiment of the invention.
Figure acceptance of the bid note is respectively:
First lens 101; Second lens 102; 3rd lens 103; 4th lens 104; Imaging surface 105; Infrared filter 106.
Embodiment
Existing camera optical lens group generally adopts multiple lens combination to be formed, although can complete shooting, the deformation quantity of its imaging is large, and overall picture resolution is lower, and uniformity coefficient is poor, causes image quality poor.
Given this, deviser of the present invention is by long-term exploration and trial, and experiment repeatedly and effort, continuous reform and innovation, devise a kind of camera optical lens group, the little and overall picture quality of its deformation quantity reaches high-res and uniformity coefficient, substantially increases image quality.
For making the object of the embodiment of the present invention, technical scheme and advantage clearly, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, instead of whole embodiments.The assembly of the embodiment of the present invention describing and illustrate in usual accompanying drawing herein can be arranged with various different configuration and design.Therefore, below to the detailed description of the embodiments of the invention provided in the accompanying drawings and the claimed scope of the present invention of not intended to be limiting, but selected embodiment of the present invention is only represented.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
First embodiment
Refer to Fig. 1, embodiments provide a kind of camera optical lens group, this camera optical lens group is sequentially comprised to image side by thing side:
First lens 101 of the positive refracting power of one tool, its thing side surface is convex surface, and surface, image side is convex surface, suitably can adjust the positive refracting power intensity of the first lens 101, is conducive to the total length shortening camera optical lens group.
One tool bears the second lens 102 of refracting power; The thing side surface of the second lens 102 is concave surface, and its surface, image side is concave surface.The thing side surface of the second lens 102 is concave surface, effectively can shorten the distance between the first lens 101 and the second lens 102.
3rd lens 103 of the positive refracting power of one tool, its thing side surface is concave surface, and its surface, image side is convex surface.
One tool bears the 4th lens 104 of refracting power, and its surface, image side is concave surface.
Wherein, the surface of the first lens 101, second lens 102, the 3rd lens 103 and the 4th lens 104 is all aspheric surface.
This camera optical lens group also comprises at least one filter element, and filter element is arranged between the 4th lens 104 and an imaging surface 105.Filter element is preferably infrared filter 106.Filter element adopts infrared filter 106, and can leach infrared light, infrared filter 106 adopts glass to make.
This camera optical lens group also comprises aperture, and aperture is arranged between thing side and the first lens 101.Aperture is arranged between object and the first lens 101, effectively to lower optics total length.
Wherein, the Abbe number of the material of the first lens 101 is V1, and the Abbe number of the material of the second lens 102 is V2, and the Abbe number of the material of the 3rd lens 103 is V3, and the Abbe number of the material of the 4th lens 104 is V4; The center thickness of the second lens 102 is TC2, and the center thickness of the 3rd lens 103 is TC3, and the center thickness of the 4th lens 104 is TC4; Total focal length of camera optical lens group is f, the focal length of the first lens 101 is f1, the focal length of the second lens 102 is f2, the focal length of the 3rd lens 103 is f3, and the distance between the first lens 101 and the second lens 102 is AC1, wherein, four lens of tool refracting power meet following relationship, then can reach coincidence imaging quality camera, and under the constant condition of the overall total length of camera lens, can take visual angle can change between 65 ° ~ 90 °.
Relational expression is as follows:
(1)(V1+V2)/(V3+V4)<0.9；
(2)1.12<TC3/TC2<2.5；
(3)1<TC3/TC4<2.5；
(4)AC1<0.15mm；
(5)(f/f3)-(f/f1)<1；
Can be learnt by (1) formula, the second lens 102 adopt high-index material to make, its refractive index index>1.6; First lens 101, the 3rd lens 103 and the 4th lens 104 all adopt ordinary refractive index material to make, its refractive index index<1.56.The refractive index of optimal design lens, can ensure that the focal length of lens meets relational expression better, improves image quality.As preferably, the first lens 101, second lens 102, the 3rd lens 103 and the 4th lens 104 are all adopted made of plastic.
By in (2) formula, the thickness of the 3rd lens 103 is greater than the thickness of the second lens 102, and the thickness of the 3rd lens 103 is at least 1.12 times of the second lens 102 thickness, and is less than 2.5 times.
By in (3) formula, the thickness of the 3rd lens 103 is greater than the thickness of the 4th lens 104, and the thickness of the 3rd lens 103 is at least 1 times of the 4th thickness, and is less than 2.5 times.
By in (4) formula, represent the first lens 101 and the second lens 102 near, both are less than 0.15mm at distance.
Wherein, the first lens 101 thing side surface is convex surface, and its surface, image side is convex surface, and the second lens 102 thing side surface is concave surface, effectively can shorten the distance between the first lens 101 and the second lens 102.And meet (6) formula, then effectively can eliminate astigmatism and shorten optical system length, increasing optical system back focal length, be beneficial to camera module packaging.
By in (5) formula, the first lens 101 focal length and the 3rd lens 103 focal length and overall total focal length meet this relational expression, greatly improve image quality to reach.When (5) formula meets, the distortion aberration of system can at random be eliminated by the negative refracting power of the 4th lens 104.
By in (6) formula, the first lens 101 focal length and the second lens 102 focal length and overall total focal length meet this relational expression, greatly improve image quality to reach.When (6) formula meets, the aberration that the first lens 101 and the second lens 102 bring can be eliminated mutually.
The aspheric fitting equation of above-mentioned each lens is expressed as follows:
Wherein:
X: in aspheric surface, distance optical axis is the point of Y, its be tangential on the relative distance of summit tangent plane on aspheric optical axis;
Y: the point in aspheric curve and the distance of optical axis;
R: radius-of-curvature;
K: conical surface coefficient; And
Ai: the i-th rank asphericity coefficient.
The camera optical lens group design parameter that the present embodiment provides is as following table:
Table one, the first embodiment parameter
Table two, asphericity coefficient
Table one is the structured data that the second embodiment is detailed, and wherein, the unit of radius-of-curvature, thickness and focal length is mm, and surperficial 0-8 sequentially represents by the surface of thing side to image side.
Table two is the aspherical surface data in the second embodiment, and wherein, R represents the radius-of-curvature in aspheric curve equation, and k represents the conical surface coefficient in aspheric curve equation, and A2-A20 then represents each surperficial 2-20 rank asphericity coefficient.In addition, in following embodiment form, the definition of data is all identical with the table one of the present embodiment and the definition of table two, does not add repeat at this.
Refer to Fig. 1 ~ Fig. 4, and associative list one and table two, the camera optical lens group that the present embodiment provides is by parameters such as the thickness of the curvature of design second lens 102, Distance geometry the 3rd lens 103 between the first lens 101 and the second lens 102, as long as meet above-mentioned relation formula (1) ~ (6), then can combine the camera optical lens group that the little and overall picture quality of deformation quantity reaches high-res and uniformity coefficient, substantially increase image quality.
In addition, general camera lens angle of visibility, probably physical significance can be met, when camera lens more in short-term, it can take visual angle will be larger, and nowadays camera lens does shorter and shorter, if angle of visibility will keep fixing, then can be difficult, the camera optical lens group that the present embodiment provides is in the constant situation of optics total length, and its angle of visibility can change between 65 ° ~ 90 °.
Second embodiment
The camera optical lens group that the present embodiment provides, its basic structure is identical with the first embodiment with the technique effect of principle and generation, is concise and to the point description, and the not mentioned part of the present embodiment part, can with reference to corresponding contents in the first embodiment.Refer to Fig. 5 ~ Fig. 8, and associative list three and table four, from the difference of the camera optical lens group provided of the second embodiment, the camera optical lens group that the present embodiment provides is that design parameter is different, the design parameter of the camera optical lens group that the present embodiment provides is as follows:
Table three, the second embodiment parameter
Table four, asphericity coefficient
3rd embodiment
The camera optical lens group that the present embodiment provides, its basic structure is identical with the first embodiment with the technique effect of principle and generation, is concise and to the point description, and the not mentioned part of the present embodiment part, can with reference to corresponding contents in the first embodiment.Refer to Fig. 9 ~ Figure 12, and associative list five and table six, from the difference of the camera optical lens group provided of the first embodiment, the camera optical lens group that the present embodiment provides is that design parameter is different, the design parameter of the camera optical lens group that the present embodiment provides is as follows:
Table five, the 3rd embodiment parameter
Table six, asphericity coefficient
In addition, table seven is the first embodiment, the camera optical lens group that provides of the second embodiment and the 3rd embodiment compares:
The comparison of table seven, three embodiments
In table seven, abso represents absolute value.
In describing the invention, it will be appreciated that, term " " center ", " longitudinal direction ", " transverse direction ", " length ", " width ", " thickness ", " on ", D score, " front ", " afterwards ", " left side ", " right side ", " vertically ", " level ", " top ", " end " " interior ", " outward ", " clockwise ", orientation or the position relationship of the instruction such as " counterclockwise " are based on orientation shown in the drawings or position relationship, only the present invention for convenience of description and simplified characterization, instead of indicate or imply that the equipment of indication or element must have specific orientation, with specific azimuth configuration and operation, therefore limitation of the present invention can not be interpreted as.
In addition, term " first ", " second " only for describing object, and can not be interpreted as instruction or hint relative importance or imply the quantity indicating indicated technical characteristic.Thus, be limited with " first ", the feature of " second " can express or impliedly comprise one or more these features.In describing the invention, the implication of " multiple " is two or more, unless otherwise expressly limited specifically.
In the present invention, unless otherwise clearly defined and limited, the term such as term " installation ", " being connected ", " connection ", " fixing " should be interpreted broadly, and such as, can be fixedly connected with, also can be removably connect, or integral; Can be mechanical connection, also can be electrical connection; Can be directly be connected, also indirectly can be connected by intermediary, can be the connection of two element internals or the interaction relationship of two elements.For the ordinary skill in the art, above-mentioned term concrete meaning in the present invention can be understood as the case may be.
In the present invention, unless otherwise clearly defined and limited, fisrt feature second feature it " on " or D score can comprise the first and second features and directly contact, also can comprise the first and second features and not be directly contact but by the other characterisation contact between them.And, fisrt feature second feature " on ", " top " and " above " comprise fisrt feature directly over second feature and oblique upper, or only represent that fisrt feature level height is higher than second feature.Fisrt feature second feature " under ", " below " and " below " comprise fisrt feature immediately below second feature and tiltedly below, or only represent that fisrt feature level height is less than second feature.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a camera optical lens group, is characterized in that, is sequentially comprised to image side by thing side:
First lens of the positive refracting power of one tool, its thing side surface is convex surface, and its surface, image side is convex surface;
One tool bears the second lens of refracting power, and its thing side surface is concave surface, and its surface, image side is concave surface;
3rd lens of the positive refracting power of one tool, its thing side surface is concave surface, and its surface, image side is convex surface;
One tool bears the 4th lens of refracting power, and its surface, image side is concave surface;
Wherein, the surface of described first lens, described second lens, described 3rd lens and described 4th lens is all aspheric surface;
Described camera optical lens group also comprises at least one filter element, and described filter element is arranged between described 4th lens and an imaging surface;
Total focal length of described camera optical lens group is f, and the focal length of described first lens is f1, and the focal length of described second lens is f2, and the focal length of described 3rd lens is f3, and the distance between described first lens and described second lens is AC1, and it meets following relationship:
AC1<0.15mm；
(f/f3)-(f/f1) <1; And,
2. camera optical lens group according to claim 1, is characterized in that, the center thickness of described second lens is TC2, and the center thickness of described 3rd lens is TC3, and it meets following relational expression:
1.12<TC3/TC2<2.5。
3. camera optical lens group according to claim 2, is characterized in that, the center thickness of described 4th lens is TC4, and it meets following relational expression:
1<TC3/TC4<2.5。
4. camera optical lens group according to claim 1, it is characterized in that, the Abbe number of the material of described first lens is V1, the Abbe number of the material of described second lens is V2, the Abbe number of the material of described 3rd lens is V3, the Abbe number of the material of described 4th lens is V4, and it meets following relational expression:
(V1+V2)/(V3+V4)<0.9。
5. camera optical lens group according to claim 4, is characterized in that, described second lens adopt the material of refractive index index>1.6 to make.
6. camera optical lens group according to claim 5, is characterized in that, described first lens, described 3rd lens and described 4th lens all adopt the material of refractive index index<1.56 to make.
7. camera optical lens group according to claim 6, is characterized in that, described first lens, described second lens, described 3rd lens and described 4th lens are all adopted made of plastic.
8. camera optical lens group according to claim 1, is characterized in that, described filter element is infrared filter.
9. camera optical lens group according to claim 8, is characterized in that, described infrared filter adopts glass to make.
10. camera optical lens group according to claim 1, is characterized in that, also comprise aperture, and described aperture is arranged between thing side and described first lens.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201511028804.3A CN105425366A (en) | 2015-12-29 | 2015-12-29 | Image photographing optical lens group |
| CN201610207379.2A CN105739061A (en) | 2015-12-29 | 2016-04-01 | Camera shooting optical lens group |
| CN201611246556.4A CN106772943B (en) | 2015-12-29 | 2016-12-29 | Camera optical camera lens group |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201511028804.3A CN105425366A (en) | 2015-12-29 | 2015-12-29 | Image photographing optical lens group |
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| CN105425366A true CN105425366A (en) | 2016-03-23 |
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| CN201511028804.3A Pending CN105425366A (en) | 2015-12-29 | 2015-12-29 | Image photographing optical lens group |
| CN201610207379.2A Pending CN105739061A (en) | 2015-12-29 | 2016-04-01 | Camera shooting optical lens group |
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| CN201610207379.2A Pending CN105739061A (en) | 2015-12-29 | 2016-04-01 | Camera shooting optical lens group |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106646836A (en) * | 2016-12-20 | 2017-05-10 | 中山联合光电科技股份有限公司 | Large aperture wide angle small imaging system |
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| CN100582852C (en) * | 2006-09-14 | 2010-01-20 | 大立光电股份有限公司 | Optical lens group for picture pick-up |
| TWI438473B (en) * | 2011-12-01 | 2014-05-21 | Largan Precision Co Ltd | Image optical lens system |
| KR20130119626A (en) * | 2012-04-24 | 2013-11-01 | 주식회사 엔투에이 | Compact imaging lens system |
| CN205720842U (en) * | 2015-12-29 | 2016-11-23 | 广州市全像光学科技有限公司 | Camera optical camera lens group |
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| CN106646836A (en) * | 2016-12-20 | 2017-05-10 | 中山联合光电科技股份有限公司 | Large aperture wide angle small imaging system |
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Application publication date: 20160323 |