CN104181673B - Large-aperture camera lens - Google Patents
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- CN104181673B CN104181673B CN201410413086.0A CN201410413086A CN104181673B CN 104181673 B CN104181673 B CN 104181673B CN 201410413086 A CN201410413086 A CN 201410413086A CN 104181673 B CN104181673 B CN 104181673B
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Abstract
The invention discloses a large-aperture camera lens. The large-aperture camera lens comprises a first lens which is a positive lens with the convex object side surface, a second lens which is a negative lens with a concave object side surface, and a third lens which is a positive lens, wherein the image side surface of the third lens is a double-peak face with the concave middle and the convex two sides, and a piece of first flat plate glass is arranged on the third lens and faces towards the image side. The composite of the large-aperture camera lens conforms to the conditional expressions, namely, the quotient of R1 and tt is larger than 0 but smaller than 0.35, the quotient of T2 and tt is larger than 0.13 but smaller than 0.25, and the quotient of R1 and T2 is larger than 2 but smaller than 2.6, wherein R1 represents the curvature radius of the first lens, tt represents the distance between the convex face vertex and the image face of the first lens, and T2 represents the thickness of the second lens. According to the camera lens, the aperture can reach F2.0, the relative brightness reaches 75% or above, the structure is compact, the large-aperture camera lens is particularly suitable for camera lenses of light and thin mobile terminals such as mobile phones and computer camera lenses, the large-aperture camera lens has good performance under the low-illumination environment, the surfaces of all the lenses are easy to machine and form, and the tolerance is large.
Description
Technical field
The present invention relates to a kind of camera lens, specifically, it is to be related to a kind of large aperture camera lens.
Background technology
At present a lot of intelligent terminals (as mobile phone, panel computer, intelligent TV set etc.) all installs have take a picture or
The camera lens of recording function, with intelligent terminal structure do more and more frivolous, therefore corresponding to the camera lens being embedded
Require more and more frivolous.For slim tiny lens, the problem being primarily present at present is that aperture is less, and little aperture is due to reaching
Light on sensitive chip is less, and when under low illuminance environment, image quality is bad, and batch production is with high costs.
Content of the invention
The present invention, in order to solve the problems, such as that under little, the low illuminance environment of existing tiny lens aperture, image quality is bad, proposes
A kind of large aperture camera lens, is the large aperture tiny lens that a kind of aperture reaches f2.0.
In order to solve above-mentioned technical problem, the present invention employs the following technical solutions and is achieved:
A kind of large aperture camera lens, comprising:
First lens, are plus lens, and its thing side surface is convex surface；
Second lens, are minus lenses, and its thing side surface is concave surface；
3rd lens, are plus lens, and its image side surface is the convex bimodal face in middle concave both sides；
And, its composition satisfies the following conditional expression:
0<r1/tt<0.35；
0.13<t2/tt<0.25；
2<r1/t2<2.6；
Wherein, r1 is the radius of curvature of the first lens, and tt is the distance of convex surface summit and the image planes of the first lens, and t2 is the
The thickness of two lens.
Further, the focal length f of described camera lens, the focal length f1 of the first lens, the focal length f2 of the second lens, the 3rd lens
Focal length f3 meets relationship below:
2<f1<f<-f2<5.2；
40<f3<50；
3.5<f3/tt<4.5；
0.35<r1/f<0.6.
Further, the visual field of described camera lens is small field of view, and its angle of half field-of view θ meets:
0.4<tanθ<0.5.
Further, it is provided with aperture diaphragm between described first lens and the second lens.
Preferably, the aperture diaphragm of described large aperture camera lens is the fixed aperture of middle-containing structure.
Preferably, between described 3rd lens and imaging side along light incident direction be disposed with the first plate glass and
Second plate glass.
Further, described first plate glass adopts the glass of bk7 model material, and utilizes IR-cut film plating process
Eliminate Infrared.
Further, described each lens are even aspheric surface, and each asphericity coefficients meet following equation:
Wherein, z is the coordinate along optical axis direction, and y is the radial coordinate in units of this length of lens unit, and c is that this is saturating
The curvature of mirror, k is circular cone coefficient, and α i is the coefficient of each high-order term, and 2i is this aspheric high power.
Or, described each lens are odd aspheric surface, and each asphericity coefficients meet following equation:
Preferably, described each lens are plastic material, and refractive index n1 of described first lens and dispersion v1 meet: 1.5 ＜
N1 ＜ 1.65,50 ＜ v1 ＜ 60；
Refractive index n2 of described second lens and dispersion v2 meet: 1.5 ＜ n2 ＜ 1.65,20 ＜ v2 ＜ 30；
Refractive index n3 of described 3rd lens and dispersion v3 meet: 1.5 ＜ n3 ＜ 1.65,50 ＜ v3 ＜ 60.
Compared with prior art, advantages of the present invention and good effect are: the camera lens of the present invention, and aperture is up to f2.0, phase
Brightness is reached with more than 75%, compact conformation, the camera lens of the light and thin type mobile terminal such as especially suitable mobile lens, computer camera lens,
There is good performance under low-light (level) environment, in addition, each eyeglass is the eyeglass of plastic material, eyeglass low cost, each eyeglass table
Face is easy to process and molding, and tolerance is good, beneficial to production in enormous quantities.
After the detailed description of embodiment of the present invention is read in conjunction with the accompanying, the other features and advantages of the invention will become more
Plus it is clear.
Brief description
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
Have technology description in required use accompanying drawing be briefly described it should be apparent that, drawings in the following description be only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, acceptable
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is a kind of profile of embodiment of large aperture camera lens proposed by the invention；
Fig. 2 is the transfer curve figure under a kind of situation of large aperture camera lens proposed by the invention；
Fig. 3 be large aperture camera lens proposed by the invention another situation under transfer curve figure；
Fig. 4 is the optics curvature of field and the distortion figure of large aperture camera lens proposed by the invention；
Fig. 5 is the point range figure of large aperture camera lens proposed by the invention；
Fig. 6 is the system chromatic curve figure of large aperture camera lens proposed by the invention；
Fig. 7 is the system relative luminance curve figure of large aperture camera lens proposed by the invention.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation description is it is clear that described embodiment is only a part of embodiment of the present invention, rather than whole embodiments.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of not making creative work
Embodiment, broadly falls into the scope of protection of the invention.
Embodiment one, as shown in figure 1, the large aperture camera lens of the present embodiment, comprising:
First lens 1, are plus lens, and its thing side surface is convex surface；
Second lens 2, are minus lenses, and its thing side surface is concave surface；
3rd lens 3, are plus lens, and its image side surface is the convex bimodal face in middle concave both sides；
In described 3rd lens, image side is provided with the first plate glass 4；
And, its composition satisfies the following conditional expression:
0<r1/tt<0.35；
0.13<t2/tt<0.25；
2<r1/t2<2.6；
Wherein, r1 is the radius of curvature of the first lens 1, and tt is the distance with image planes for the convex surface summit of the first lens 1, and t2 is
The thickness of the second lens.
The large aperture camera lens of the present embodiment, its aperture can reach f2.0, and camera lens overall length is less than 3.5mm. the transmission of system
Function (mtf) reaches more than 0.5 within (143lp/mm) 0.85 visual field under 1/2nyquist frequency, and system imaging is preferably, real
Existing visible light wave range (430nm-650nm) blur-free imaging.System focal 2.84mm, cmos pixel dimension 1.75um, diagonal chi
Very little 2.57mm, cut-off frequency 286lp/mm.
Described each lens are plastic material, and refractive index n1 of described first lens and dispersion v1 meet: 1.5 ＜ n1 ＜
1.65,50 ＜ v1 ＜ 60；
Refractive index n2 of described second lens and dispersion v2 meet: 1.5 ＜ n2 ＜ 1.65,20 ＜ v2 ＜ 30；
Refractive index n3 of described 3rd lens and dispersion v3 meet: 1.5 ＜ n3 ＜ 1.65,50 ＜ v3 ＜ 60.
The first described lens 1 adopt the version of plus lens, have positive focal power, the face of thing side is convex surface, rises
To the effect collecting light and converge off-axis ray angle.Second lens 2 adopt the version of minus lenses, have negative light burnt
Degree, the effect of beam shaping is played so that light passes through the rim ray after the second lens 2 and chief ray for concave surface in the face of thing side
There is preferable collimation and in turn ensure that the inclination angle to optical axis for the chief ray simultaneously.3rd lens 3 adopt plus lens, have positive light burnt
Degree, in order to preferably mate the cra eyeglass of imager chip, the 3rd lens 3 shape adopts polymorphic structure, namely bimodal structure is come
Shaping is carried out to light beam, off-axis aberration can be eliminated simultaneously.
Preferably, it is provided with aperture diaphragm (not shown) between described first lens 1 and the second lens 2.In this reality
Apply in example, the aperture diaphragm of camera lens preferably employs the fixed aperture of middle-containing structure, such structure tolerance preferably, can eliminate
Except off-axis aberration it is ensured that the yield of volume production in the future.
It is disposed with the first plate glass 4 and second along light incident direction flat between described 3rd lens and imaging side
Glass sheet 5.First plate glass 4 utilizes IR-cut film plating process to eliminate Infrared.Second plate glass 5 is imager chip
Protective glass, for protecting imager chip.
Such as, the first plate glass 4 is ir cut filter (cutoff filter), can using such optical filter
Effectively to filter out the infrared light not needing to reach imaging surface, the one of gained color of image effect and the same scene of eye-observation
Cause.Optical filter material is bk7, and refractive index and dispersion are respectively n=1.5168, v=64.17.Disappeared using ir cut film plating process
Except infrared light enters sensor.Front group adopts plus lens and minus lenses to collect off-axis ray the certain key light of integer guarantee
Line angle degree incident angle, positive and negative combination contributes to color difference eliminating, and the 3rd lens 3 Main Function is by further for light integer and to disappear
Coma in addition to axle and astigmatism, and accurately revise chief ray angle.
The camera lens that the present embodiment provides adopts 3 eyeglasses (the first lens 1, the second lens 2 and the 3rd lens 3), is
Plastic aspherical element eyeglass, according to architectural characteristic Rational Arrangement between each element, lens thickness and airspace thickness are equal for 3 eyeglasses
Even distribution, does not therefore have excessive center thickness, does not have too small center thickness, such structure is for the public affairs of subsequent production yet
Difference controls, production yield is highly advantageous, and lens shape is easy to process and molding, meets the requirement of the high relative luminance of large aperture, and
And the quality of high/low temperature imaging is optimized and corrects.Its structure is simple, function admirable, and tolerance is good, is simple to manufacture, price
Cheap.
As a preferred embodiment, the refractive index of the first lens 1 and dispersion range can be in 1.5 ＜ n1 ＜ 1.65,50 ＜
V1 ＜ 60, using the plastic material of e48r model, its refractive index and dispersion are respectively n1=1.53, v1=56.
The refractive index of the second lens 2 and dispersion range can be in the present embodiment, excellent in 1.5 ＜ n2 ＜ 1.65,20 ＜ v2 ＜ 30
Using the plastic material of okp4ht model, its refractive index and dispersion are respectively n2=1.63, v2=23.4 for choosing.
The refractive index of the 3rd lens 3 and dispersion range can be in the present embodiment, excellent in 1.5 ＜ n3 ＜ 1.65,50 ＜ v3 ＜ 60
Using the plastic material of e48r model, its refractive index and dispersion are respectively n3=1.53, v3=56 for choosing.
The camera lens of the present embodiment, up to f2.0, relative luminance reaches more than 75% to aperture, compact conformation, especially suitable handss
The camera lens of the light and thin type mobile terminals such as machine camera lens, computer camera lens, has good performance under low-light (level) environment, and each lens surface is easy
In processing and molding, tolerance is good.
Embodiment two, in the present embodiment, the focal length of camera lens is designed requires, the focal length f of camera lens, the focal length f1 of the first lens,
The focal length f2 of the second lens, the focal length f3 of the 3rd lens meet relationship below:
2<f1<f<-f2<5.2；
40<f3<50；
3.5<f3/tt<4.5；
0.35<r1/f<0.6.
In order to realize the allomeric function of camera lens, that is, aperture is big, camera lens is thin and light transmission is suitable for well low illuminance ring
Border, the visual field of described camera lens is small field of view, and its angle of half field-of view θ meets:
0.4<tanθ<0.5.
A kind of lens data of the large aperture camera lens of the present embodiment is given below, wherein, the angle of view is 50 °, and
Aperture reaches the large aperture small field of view ccm camera lens of f2.0.As shown in table 1, wherein: surface type (type), each light on optical axis
Learn the curvature (c) on surface, the thickness between each optical surface and adjacent next one optical surface along along the optical axis of light incident direction
Degree (t), the material (glass) between each optical surface and adjacent next one optical surface along along the optical axis of light incident direction,
Half bore (semi-diameter), circular cone coefficient (conic), focal power (focal power), wherein, thickness (t) He Bankou
The unit in footpath (semi-diameter) is mm, and the unit of curvature (c) and focal power (focal power) is mm-1.
As in Fig. 1, t represents the distance near image side surface to rear one side for second lens 2, described each lens are even aspheric
Face, and even asphericity coefficients α 2, α 3, α 4, α 5, α 6, α 7, α 8, each asphericity coefficients meet following equation:
Wherein, z is the coordinate along optical axis direction, and y is the radial coordinate in units of this length of lens unit, and c is that this is saturating
The curvature of mirror, k is circular cone coefficient, and α i is the coefficient of each high-order term, and 2i is this aspheric high power.
Wherein, z is the coordinate along optical axis direction, and y is the radial coordinate in units of length of lens unit, and c is curvature (1/
R), k is circular cone coefficient (coin constant), and α i is the coefficient of each high-order term, and 2i is aspheric high power (the order
Of aspherical coefficient), in the design, i=8 is quadratic term up to 16 power.
Table 1
Table 2
The large aperture camera lens of the present embodiment, cooperation ov9726 sensitive chip can reach 50 ° of the angle of visual field, system imaging matter
Amount is excellent, and relative illumination uniformly and ensures more than 70%, ensure that the performance under low-light (level) well.
Certainly, in this embodiment, it would however also be possible to employ odd aspherical equation is designed, odd aspherical equation
General formula is as follows:
Wherein, i=1,2,3,4 ... n.Purpose of design equally can also be reached.
It is provided with the second plate glass 5 between the first described plate glass 4 and image side surface, be the protection glass of imager chip
Glass, after the flange of system, Jiao ensures in more than 0.3mm.
As shown in Figure 2 and Figure 3, be camera lens embodiment of the present invention mtf, mtf transfer curve figure (optical transfer function)
Can be with the image quality of concentrated expression system, its curve shape is more smooth, and relatively x-axis height higher it was demonstrated that the imaging of system
Quality is better.What Fig. 2 reflected is the mtf curve under sensor limiting resolution, and the reflection of Fig. 3 figure is that 1/2 limit differentiates frequency
Lower mtf curve.In figure difference lines represent each field rays respectively, from figure, two curves passing in letter curve chart
More smooth compact, the mtf value that curve is characterized is very high, and within 0.85 visual field in the case of limiting resolution, mtf reaches
More than 0.25, illustrate that the aberration of system has obtained good correction.
As shown in figure 4, being the optics curvature of field and the distortion figure of the present embodiment camera lens, different colours represent different wavelength, with
A kind of color right side graph be meridian direction, leftmost curve is Sagittal field curvature, the two make the difference be exactly system astigmatism, astigmatism and
The curvature of field is the important aberration of the outer field rays of impact axle, and astigmatism crosses the serious imaging matter having influence on system off-axis ray of conference
Amount, the curvature of field can cause center and peripheral optimal imaging not in one plane, the curvature of field of system and astigmatism all quilts from figure
Within being corrected to 50um.Another curve of in figure is the distortion curve of system, and distortion does not affect the definition of system, but can draw
The anamorphose of the system of rising, for wide-angle lens, correcting distorted is extremely difficult, and the optical distortion of the system is less than
2%, this explanation distortion has been remedied to an extraordinary degree.
As shown in figure 5, being the point range figure of the present embodiment camera lens, each field rays of point range figure display system are at image planes
The disperse degree converging and being formed, so it characterizes system obtains various difference characteristics, the less proof of rms radius of point range figure
The image quality of system is better.The disc of confusion rms diameter of the system is respectively less than 4.5um, illustrates that aberration correction is very good.
As shown in fig. 6, being system chromatic curve figure, from fig. 6 it can be seen that the present embodiment camera lens aberration (red, green,
The mutual difference of blue three colors) control within 0.5um, it may be said that control is fairly good, typically for slim tiny lens
In the case of at present existing sampling image lens design aberration reach 1 pixel rank just good at last, and the core of the design
Piece pixel a size of 1.75um.
As shown in fig. 7, be system relative luminance curve figure, it can be seen from figure 7 that the relative luminance of the present embodiment camera lens
More than 65% can be reached, generally sampling image lens design on the market is exactly general water relatively twice more than 50%
Flat, relatively higher twice represent periphery brightness and the concordance of center brightness is higher；If conversely, relative luminance is relatively low, image side
Angle appears to that ratio is dark, and imaging effect is bad.
Certainly, described above is not limitation of the present invention, and the present invention is also not limited to the example above, and this technology is led
Change, remodeling, interpolation or replacement that the those of ordinary skill in domain is made in the essential scope of the present invention, also should belong to this
Bright protection domain.
Claims (9)
1. a kind of large aperture camera lens is it is characterised in that include:
First lens, are plus lens, and its thing side surface is convex surface；
Second lens, are minus lenses, and its thing side surface is concave surface；
3rd lens, are plus lens, and its image side surface is the convex bimodal face in middle concave both sides；
And, its composition satisfies the following conditional expression:
0<r1/tt<0.35；
0.13<t2/tt<0.25；
2<r1/t2<2.6；
Wherein, r1 is the image surface curvature radius of the first lens, and tt is the distance of convex surface summit and the image planes of the first lens, and t2 is the
The thickness of two lens, the focal length f of described camera lens, the focal length f1 of the first lens, the focal length f2 of the second lens, the focal length of the 3rd lens
F3 meets relationship below:
2<f1<f<-f2<5.2；
40<f3<50；
0.35<r1/f<0.6.
2. it is characterised in that the visual field of described camera lens is small field of view, it partly regards large aperture camera lens according to claim 1
Rink corner θ meets:
0.4<tanθ<0.5.
3. large aperture camera lens according to claim 1 is it is characterised in that arrange between described first lens and the second lens
There is aperture diaphragm.
4. large aperture camera lens according to claim 3 is it is characterised in that the aperture diaphragm of described large aperture camera lens is put in being
The fixed aperture of structure.
5. the large aperture camera lens according to any one of claim 1-2 is it is characterised in that described 3rd lens and imaging side
Between be disposed with the first plate glass and the second plate glass along light incident direction.
6. large aperture camera lens according to claim 5 it is characterised in that: described first plate glass adopt bk7 model material
The glass of matter, and eliminate Infrared using IR-cut film plating process.
7. the large aperture camera lens according to any one of claim 1-2 is it is characterised in that described each lens are even aspheric
Face, each asphericity coefficients meet following equation:
Wherein, z is the coordinate along optical axis direction, and y is the radial coordinate in units of this length of lens unit, and c is this lens
Curvature, k is circular cone coefficient, and α i is the coefficient of each high-order term, and 2i is this aspheric high power.
8. the large aperture camera lens according to any one of claim 1-2 is it is characterised in that described each lens are odd aspheric
Face, each asphericity coefficients meet following equation:
.
9. the large aperture camera lens according to any one of claim 1-2 it is characterised in that: described each lens be plastics material
Matter, refractive index n1 of described first lens and dispersion v1 meet: 1.5 ＜ n1 ＜ 1.65,50 ＜ v1 ＜ 60；
Refractive index n2 of described second lens and dispersion v2 meet: 1.5 ＜ n2 ＜ 1.65,20 ＜ v2 ＜ 30；
Refractive index n3 of described 3rd lens and dispersion v3 meet: 1.5 ＜ n3 ＜ 1.65,50 ＜ v3 ＜ 60.
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| JP5366314B2 (en) * | 2009-06-29 | 2013-12-11 | 株式会社オプトロジック | Imaging lens |
| CN204028442U (en) * | 2014-08-20 | 2014-12-17 | 青岛歌尔声学科技有限公司 | A kind of large aperture camera lens |
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| JP2005316010A (en) * | 2004-04-27 | 2005-11-10 | Nidec Copal Corp | Imaging lens |
| TW201200928A (en) * | 2010-06-30 | 2012-01-01 | E Pin Optical Industry Co Ltd | Three-piece pickup lens |
| KR101303559B1 (en) * | 2011-05-11 | 2013-09-09 | 주식회사 코렌 | Photographic lens optical system |
| US8363335B1 (en) * | 2011-08-02 | 2013-01-29 | Newmax Technology Co., Ltd. | Optical lens system |
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| JP5366314B2 (en) * | 2009-06-29 | 2013-12-11 | 株式会社オプトロジック | Imaging lens |
| CN204028442U (en) * | 2014-08-20 | 2014-12-17 | 青岛歌尔声学科技有限公司 | A kind of large aperture camera lens |
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Effective date of registration: 20201012 Address after: 261031 north of Yuqing street, east of Dongming Road, high tech Zone, Weifang City, Shandong Province (Room 502, Geer electronic office building) Patentee after: GoerTek Optical Technology Co.,Ltd. Address before: International Exhibition Center of wealth 18 No. 266061 Shandong province Qingdao city Laoshan District Qinling Mountains Road No. 3 Building 4 layer 401-436 Patentee before: Qingdao GoerTek Technology Co.,Ltd. |