CN101470249B - Four-piece type optical lens group for imaging - Google Patents
Four-piece type optical lens group for imaging Download PDFInfo
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- CN101470249B CN101470249B CN2007103052243A CN200710305224A CN101470249B CN 101470249 B CN101470249 B CN 101470249B CN 2007103052243 A CN2007103052243 A CN 2007103052243A CN 200710305224 A CN200710305224 A CN 200710305224A CN 101470249 B CN101470249 B CN 101470249B
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Abstract
The invention discloses an optical four-lens unit for imaging, which comprises a first lens with positive refraction power, a second lens with negative refraction power, a crescent-shaped third lens with negative refraction power, and a fourth lens with negative fraction power which are disposed sequentially from the object side to the image side. The front surface of the first lens is a convex surface, the rear surface of the second lens is a concave face, at least one aspherical face is arranged on the second lens, the rear surface of the third lens is a convex surface, the front surface of the fourth lens is a convex surface, and the rear surface of the further lens is an aspherical face. With the lens structure, arrangement mode and lens configuration, the volume of the lens unit can be effectively reduced, and higher resolving power can be obtained.
Description
Technical field
The present invention relates to a kind of lens combination, be meant a kind of miniaturization four-piece type imaging optical frames group that is applied to camera cell phone especially.
Background technology
Recent years, rise along with mobile phone camera, the demand of miniaturization phtographic lens day by day improves, and the photosensory assembly of general phtographic lens is nothing more than being photosensitive coupling component (Charge CoupledDevice, CCD) or complementary matal-oxide semiconductor (Complementary Metal-OxideSemiconductor, CMOS) two kinds, because manufacture of semiconductor development of technology, make the picture element area of photosensory assembly dwindle, the miniaturization phtographic lens is gradually toward the development of high picture element field, therefore, the requirement to image quality also increases day by day.
Existing high resolution mobile lens adopts preposition aperture more and is the lens combination of four-piece type, and wherein, first eyeglass and second eyeglass often bind mutually with two spherical mirrors and become Doublet (doublet), and in order to color difference eliminating, but the method has its shortcoming:
One, too much spherical mirror configuration make and the degree of freedom in system deficiency cause the optical system total length to be difficult for shortening;
Its two, the processing procedure that glass mirror binds is difficult for, and causes the difficulty in the manufacturing.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of four-piece type imaging optical frames group, with the image quality of lifting optical system, and effectively shortens the camera lens volume.
For solving the problems of the technologies described above, the invention provides a kind of brand-new optical frames group that constitutes by four lens, its technical scheme is as follows:
A kind of four-piece type imaging optical frames group, configuration successively from the object side to image side: first lens of the positive refracting power of a tool, its front surface are convex surface; Second lens of the negative refracting power of one tool, its rear surface is a concave surface; One is crescent and the 3rd lens of the negative refracting power of tool, and its rear surface is a convex surface; And the 4th lens of the negative refracting power of a tool, its front surface is a convex surface, and the rear surface is aspheric surface, the shape of lens and arrangement mode by this can effectively promote the resolving power of optical frames group.
Provide powerful positive refracting power by the first lens front surface, and aperture placed near thing side place, with the outgoing pupil (Exit Pupil) that makes the four-piece type imaging with the optical frames group away from imaging surface, therefore, light will be incident in the mode near vertical incidence on the photosensory assembly, this is Telecentric (heart far away) characteristic of picture side, this characteristic is very important for the photoperceptivity of solid-state photosensory assembly at present, to make the sensitization susceptibility of photosensory assembly improve, the minimizing system produces the possibility at dark angle.
Four-piece type imaging of the present invention for the aberration that effective update the system produces, is controlled abbe number (Abbe Number) V1 of first lens, the abbe number V2 of second lens and the abbe number V4 of the 4th lens with the optical frames group, must satisfy following relational expression:
V2＜32；
[(V1+V4)/2]-V2＞15, and V4＞45.
Further, control abbe number (Abbe Number) V2＜29 of second lens, then the four-piece type imaging can promote with the resolving power of optical frames group again.
In addition, the four-piece type imaging is with the trend of optical frames group miniaturization, and system need contain visual angle widely, makes focal length become very short, in this case, the radius-of-curvature of eyeglass and the size of eyeglass all become very little, to be difficult to produce above-mentioned eyeglass with the traditional glass abrasive method, therefore, on eyeglass, adopt plastic material, mode by ejection formation is made eyeglass, can use the eyeglass of cheaper cost production high precision; And aspheric surface is set on minute surface, and aspheric surface can be made into the shape beyond the sphere easily, obtains more control variable, in order to subduing aberration, and then the number of reduction eyeglass use.And the point of inflexion is set on minute surface, the correction of off-axis aberration is had more effectiveness.
Four-piece type imaging of the present invention is with in the optical frames group, first focal length of lens is f1, second focal length of lens is f2, the focal length of the 3rd lens is f3, the focal length of the 4th lens is f4, the synthetic focal length of first lens and second lens is f12, and whole four-piece type imaging is f with the focal length of optical frames group, and it satisfies following relational expression:
1.2＜f/f1＜2.0；
-0.5＜f/f3＜0；
-0.5＜f/f4＜0；
First lens are as if the lower limit of f/f1 less than the above-mentioned relation formula, then the four-piece type imaging is with the refracting power deficiency of optical frames group, make that the optics total length is long, and it is comparatively difficult for the angle on the compacting light incident photosensory assembly, if f/f1 is greater than the higher limit of above-mentioned relation formula, then the higher order aberratons of optical system generation will be difficult to revise; The 3rd lens and the 4th lensing are as the revisal lens, and its refracting power is comparatively desirable in above-mentioned scope;
Furthermore, it is then comparatively desirable to make f/f1, f/f2, f/f3, f/f4, f/f12 satisfy following relational expression:
1.4＜f/f1＜1.7；
-0.8＜f/f2＜-0.5；
-0.2＜f/f3＜0；
-0.5＜f/f4＜0；
0.8＜f/f12＜1.2。
By the defined scope of above-mentioned relation formula, the present invention is averaged out in the correction of the volume of optical frames group and aberration.
Four-piece type imaging of the present invention with in the optical frames group control effective diameter position, the 4th lens rear surface mirror angle ANG42＜-28deg., the direction of its mirror angle be defined as " when peripheral effective diameter angle to tiltedly just then being defined as inclination, tiltedly then being defined as negative to the thing inclination when peripheral effective diameter angle ", so can effectively dwindle the angle of light incident photosensory assembly and the ability of enhanced system correction off-axis aberration.
Four-piece type imaging of the present invention is with in the optical frames group, and the front surface radius-of-curvature of first lens is R1, and the rear surface radius-of-curvature of second lens is R4, and whole four-piece type imaging is f with the focal length of optical frames group, and its relation is as follows:
0.2＜R1/f＜0.6；
0.5＜R4/f＜1.2；
The present invention is averaged out in the correction of the volume of optical frames group and aberration.
Four-piece type imaging of the present invention images in the sense electronics optical assembly with the object of optical frames group, and the four-piece type imaging is TTL with the optics length overall of optical frames group, the four-piece type imaging highly is ImgH with the imaging of optical frames group, both satisfy following relational expression: TTL/ImgH＜2.2, and above-mentioned relation can be kept the characteristic of photo-optics lens combination miniaturization.
Four-piece type imaging of the present invention is with in the optical frames group, and the mirror spacing of first lens and second lens is T12, and whole four-piece type imaging is f with the focal length of optical frames group, and its relation is as follows: T12/f＞0.015.Above-mentioned relation can effectively promote the ability of optical frames group correction astigmatism (Astigmatism).
Four-piece type imaging of the present invention is controlled the center thickness 0.25mm＜CT2＜0.7mm of second lens with the optical frames group, the effective aberration of update the system, and the length that reduces optical system had obvious effect.
Four-piece type imaging optical frames group of the present invention, the imaging highly angle of corresponding its incident electron photosensory assembly of chief ray is CRA (Chief Ray Angle), 1 half of maximum field of view angle is HFOV, and aforementioned both satisfy following relational expression: 0.5＜tan (CRA)/tan (HFOV)＜1.05; Above-mentioned relation can make lens combination and sense electronics optical assembly compatibility, can make lens combination possess the characteristic of wide viewing angle simultaneously.
Description of drawings
The present invention is further detailed explanation below in conjunction with accompanying drawing and embodiment:
Fig. 1 is the optical system synoptic diagram of first embodiment of the invention;
Fig. 2 is the aberration curve figure of first embodiment of the invention;
Fig. 3 is the optical system synoptic diagram of second embodiment of the invention;
Fig. 4 is the aberration curve figure of second embodiment of the invention;
Fig. 5 is the optical system synoptic diagram of third embodiment of the invention;
Fig. 6 is the aberration curve figure of third embodiment of the invention.
Embodiment
First embodiment
First embodiment of the invention sees also Fig. 1, and the aberration curve of first embodiment sees also Fig. 2, and first embodiment extremely comprises as side from the thing side:
One is crescent and the 3rd lens 30 of the negative refracting power of tool, its material is plastics, the 3rd lens 30 have a front surface 31 and a rear surface 32, and the 3rd lens 30 front surfaces 31 are concave surface, the 3rd lens 30 rear surfaces 32 are convex surface, and the front surface 31 of the 3rd lens 30 all is made as aspheric surface with rear surface 32 in addition;
The 4th lens 40 of the negative refracting power of one tool, its material is plastics, the 4th lens 40 have a front surface 41 and a rear surface 42, and the 4th lens 40 front surfaces 41 are convex surface, the 4th lens 40 rear surfaces 42 are concave surface, the front surface 41 of the 4th lens 40 all is made as aspheric surface with rear surface 42 in addition, and all is provided with the point of inflexion;
One aperture 50, be positioned at first lens 10 before;
One infrared filter (IR Filter) 60 places after the 4th lens 40, and it does not influence the focal length of system;
One imaging surface 70 places after the infrared filter 60.
The equation of aspheric curve is expressed as follows:
Wherein:
X: the cross-sectional distance of eyeglass;
Y: the point on the aspheric curve is apart from the height of optical axis;
K: conical surface coefficient;
Ai: i asphericity coefficient.
The first embodiment four-piece type imaging is with in the optical frames group, the focal length of first lens is f1, the focal length of second lens is f2, the focal length of the 3rd lens is f3, the focal length of the 4th lens is f4, the synthetic focal length of first lens and second lens is f12, and whole four-piece type imaging is f with the focal length of optical frames group, and its pass is:
f＝3.56mm；
f/f1＝1.50；
f/f2＝-0.64；
f/f3＝-0.003；
f/f4＝-0.39；
f/f12＝1.07。
The first embodiment four-piece type imaging is with in the optical frames group, and the abbe number of first lens (AbbeNumber) is V1, and the abbe number of second lens is V2, and the abbe number of the 4th lens is V4, and its pass is:
V2＝23.4；
V4＝55.8；
[(V1+V4)/2]-V2＝32.8。
The first embodiment four-piece type imaging is with in the optical frames group, and the front surface radius-of-curvature of first lens is R1, and whole four-piece type imaging is f with the focal length of optical frames group, and its pass is: R1/f=0.32.
The first embodiment four-piece type imaging is with in the optical frames group, and the rear surface radius-of-curvature of second lens is R4, and whole four-piece type imaging is f with the focal length of optical frames group, and its pass is: R4/f=0.69.
The first embodiment four-piece type imaging is with in the optical frames group, and the center thickness of second lens is CT2=0.350mm.
The first embodiment four-piece type imaging is with in the optical frames group, the mirror angle ANG42=-34.7deg. of effective diameter position, the 4th lens rear surface, the direction of its mirror angle be defined as " when peripheral effective diameter angle to tiltedly just then being defined as inclination, tiltedly then being defined as negative to the thing inclination when peripheral effective diameter angle ".
The first embodiment four-piece type imaging is with in the optical frames group, the chief ray that imaging is highly corresponding, the angle CRA of its incident electron photosensory assembly (Chief Ray Angle), half of maximum field of view angle is HFOV, its pass is: tan (CRA)/tan (HFOV)=0.82.
The first embodiment four-piece type imaging is with in the optical frames group, and the mirror spacing of first lens and second lens is T12, and whole four-piece type imaging is f with the focal length of optical frames group, and its pass is: T12/f=0.020.
The first embodiment four-piece type imaging is TTL with the optics length overall of optical frames group, and the four-piece type imaging highly is ImgH with the imaging of optical frames group, and its pass is: TTL/ImgH=1.75.
The detailed structured data of first embodiment is as shown in the table 1, and its aspherical surface data is as shown in the table 2, and wherein, the unit of radius-of-curvature, thickness and focal length is mm, and HFOV is defined as half of maximum visual angle.
Table 1
| (first embodiment) | |||||||
| F (focal length)=3.56mm, Fno=2.8, HFOV=31.6deg. | |||||||
| The Surface surface | Curvature Radius subsequent corrosion | Thickness thickness | The Material material | The Index refractive index | Abbe Ah ratio coefficient | Focal length focal length | |
| 0 | The Object object | The Plano plane | Infinity is unlimited | ||||
| 1 | Ape.Stop aperture/Lens 1 first lens | 1.14033(ASP) | 0.558 | The Plastic plastics | 1.543 | 56.5 | 2.39 |
| 2 | 7.71830(ASP) | 0.070 | |||||
| 3 | Lens 2 second lens | 8.34880(ASP) | 0.350 | The Plastic plastics | 1.632 | 23.4 | -5.62 |
| 4 | 2.45225(ASP) | 0.455 | |||||
| 5 | Lens 3 the 3rd lens | -2.51873(ASP) | 0.461 | The Plastic plastics | 1.543 | 56.5 | -1149.81 |
| 6 | -2.69189(ASP) | 0.405 | |||||
| 7 | Lens 4 the 4th lens | 2.06586(ASP) | 0.551 | The Plastic plastics | 1.530 | 55.8 | -9.29 |
| 8 | 1.32092(ASP) | 0.300 |
| 9 | The IR-filter infrared filter | The Plano plane | 0.300 | Glass glass | 1.517 | 64.1 | |
| 10 | The Plano plane | 0.390 | |||||
| 11 | Image imaging surface image | The Plano plane |
Table 2
| Aspheric Coefficient asphericity coefficient | ||||
| The Surface surface | 1 | 2 | 3 | 4 |
| K＝ A4＝ A6＝ | -1.33902E-01 1.03808E-02 -9.42864E-02 | 0.00000E+00 -1.33987E-01 6.32447E-02 | 0.00000E+00 -9.99676E-02 7.11577E-02 | -5.65556E+00 1.61215E-01 8.19150E-03 |
| A8＝ A10＝ | 3.35935E-01 -5.66478E-01 | -4.90780E-01 -1.25742E-02 | -1.98975E-01 -2.88497E-01 | 3.96247E-01 0.00000E+00 |
| |
5 | 6 | 7 | 8 |
| K＝ A4＝ A6＝ A8＝ A10＝ A12＝ A14＝ A16＝ | -1.00085E+00 -6.37151E-02 -4.01318E-01 8.20985E-02 7.78895E-01 -1.34607E+00 5.72115E-01 -4.48893E-01 | 1.17699E+00 -1.48073E-01 6.03440E-02 -5.18037E-02 1.88415E-02 4.61830E-02 1.76367E-02 -3.80116E-02 | -1.25778E+01 -3.01290E-01 1.17593E-01 -2.10841E-02 5.58830E-03 -7.86663E-04 -3.45665E-04 6.28828E-05 | -7.28164E+00 -1.39463E-01 3.36578E-02 -4.77753E-03 -7.95611E-04 -1.37778E-04 1.89334E-04 -2.99422E-05 |
Second embodiment
Second embodiment of the invention sees also Fig. 3, and the aberration curve of second embodiment sees also Fig. 4, and second embodiment extremely comprises as side from the thing side:
One is crescent and the 3rd lens 30 of the negative refracting power of tool, its material is plastics, the 3rd lens 30 have a front surface 31 and a rear surface 32, and the 3rd lens 30 front surfaces 31 are concave surface, the 3rd lens 30 rear surfaces 32 are convex surface, and the front surface 31 of the 3rd lens 30 all is made as aspheric surface with rear surface 32 in addition;
The 4th lens 40 of the negative refracting power of one tool, its material is plastics, the 4th lens 40 have a front surface 41 and a rear surface 42, and the 4th lens 40 front surfaces 41 are convex surface, the 4th lens 40 rear surfaces 42 are concave surface, the front surface 41 of the 4th lens 40 all is made as aspheric surface with rear surface 42 in addition, and all is provided with the point of inflexion;
One aperture 50, be positioned at first lens 10 before;
One infrared filter (IR Filter) 60 places after the 4th lens 40, and it does not influence the focal length of system;
One imaging surface 70 places after the infrared filter 60.
The second embodiment four-piece type imaging is with in the optical frames group, the focal length of first lens is f1, the focal length of second lens is f2, the focal length of the 3rd lens is f3, the focal length of the 4th lens is f4, the synthetic focal length of first lens and second lens is f12, and whole four-piece type imaging is f with the focal length of optical frames group, and its pass is:
f＝3.48mm；
f/f1＝1.80；
f/f2＝-1.12；
f/f3＝-0.10；
f/f4＝-0.10；
f/f12＝0.98。
The second embodiment four-piece type imaging is with in the optical frames group, and the abbe number of first lens (AbbeNumber) is V1, and the abbe number of second lens is V2, and the abbe number of the 4th lens is V4, and its pass is:
V2＝30.2；
V4＝55.8；
[(V1+V4)/2]-V2＝26.0。
The second embodiment four-piece type imaging is with in the optical frames group, and the front surface radius-of-curvature of first lens is R1, and whole four-piece type imaging is f with the focal length of optical frames group, and its pass is: R1/f=0.39.
The second embodiment four-piece type imaging is with in the optical frames group, and the rear surface radius-of-curvature of second lens is R4, and whole four-piece type imaging is f with the focal length of optical frames group, and its pass is: R4/f=0.96.
The second embodiment four-piece type imaging is with in the optical frames group, and the center thickness of second lens is CT2=0.424mm.
The second embodiment four-piece type imaging is with in the optical frames group, the mirror angle ANG42=-37.8deg. of effective diameter position, the 4th lens rear surface, the direction of its mirror angle be defined as " when peripheral effective diameter angle to tiltedly just then being defined as inclination, tiltedly then being defined as negative to the thing inclination when peripheral effective diameter angle ".
The second embodiment four-piece type imaging is with in the optical frames group, the chief ray that imaging is highly corresponding, the angle CRA of its incident electron photosensory assembly (Chief Ray Angle), half of maximum field of view angle is HFOV, its pass is: tan (CRA)/tan (HFOV)=0.80.
The second embodiment four-piece type imaging is with in the optical frames group, and the mirror spacing of first lens and second lens is T12, and whole four-piece type imaging is f with the focal length of optical frames group, and its pass is: T12/f=0.020.
The second embodiment four-piece type imaging is TTL with the optics length overall of optical frames group, and the four-piece type imaging highly is ImgH with the imaging of optical frames group, and its pass is: TTL/ImgH=1.86.
The detailed structured data of second embodiment is as shown in the table 3, and its aspherical surface data is as shown in the table 4, and wherein, the unit of radius-of-curvature, thickness and focal length is mm, and HFOV is defined as half of maximum visual angle.
Table 3
| (second embodiment) | |||||||
| F (focal length)=3.48mm, Fno=3.2, HFOV (half angle of view)=32.1deg. | |||||||
| The Surface surface | Curvature Radius radius-of-curvature | Thickness thickness | The Material material | The Index refractive index | Abbe Ah ratio coefficient | Focal length focal length | |
| ?0 | The Object object | The Plano plane | Infinity is unlimited | ||||
| 1 | Ape. Stop aperture/Lens 1 first lens | 1.35154(ASP) | 0.577 | The Plastic plastics | 1.543 | 56.5 | 1.93 |
| ?2 | -4.00530(ASP) | 0.070 | |||||
| ?3 | Lens 2 second lens | -4.25630(ASP) | 0.424 | The Plastic plastics | 1.583 | 30.2 | -3.13 |
| ?4 | 3.31540(ASP) | 0.520 | |||||
| ?5 | Lens 3 the 3rd lens | -2.57121(ASP) | 0.490 | The Plastic plastics | 1.543 | 56.5 | -34.76 |
| ?6 | -3.17610(ASP) | 0.050 | |||||
| ?7 | Lens 4 the 4th lens | 2.14689(ASP) | 0.970 | The Plastic plastics | 1.530 | 55.8 | -34.59 |
| ?8 | 1.62106(ASP) | 0.300 | |||||
| ?9 | The IR-filter infrared filter | The Plano plane | 0.300 | Glass glass | 1.517 | 64.1 | |
| 10 | The Plano plane | 0.390 | |||||
| 11 | Image imaging surface image | The Plano plane |
Table 4
| Aspheric Coefficient asphericity coefficient | ||||
| The Surface surface | 1 | 2 | 3 | 4 |
| K＝ A4＝ A6＝ A8＝ A10＝ | -3.80232E-01 -1.13523E-02 -1.07252E-01 1.74057E-02 -7.96267E-01 | 0.00000E+00 -2.63415E-01 -3.23118E-01 -4.47433E-01 1.47164E+00 | 0.00000E+00 -2.28186E-01 -2.71303E-01 -3.48195E-01 2.39319E+00 | -9.95600E+00 1.12339E-01 -1.60965E-01 3.92431E-01 0.00000E+00 |
| |
5 | 6 | 7 | 8 |
| K＝ A4＝ A6＝ A8＝ A10＝ A12＝ A14＝ A16＝ | -2.83012E+01 1.65439E-02 -3.20743E-01 4.72536E-02 6.50861E-01 -1.38987E+00 8.01233E-01 -4.80765E-02 | -1.18242E+00 -1.73348E-01 1.31254E-01 -6.18286E-02 -8.80875E-03 3.03470E-02 1.71781E-02 -2.17215E-02 | -1.93924E+01 -2.81918E-01 1.28797E-01 -1.44657E-02 6.06841E-03 -1.35502E-03 -9.89564E-04 -4.62849E-04 | -5.15358E+00 -1.06309E-01 3.15016E-02 -5.98672E-03 -5.42676E-04 -3.50963E-05 1.97629E-04 -3.61111E-05 |
The 3rd embodiment
Third embodiment of the invention sees also Fig. 5, and the aberration curve of second embodiment sees also Fig. 6, and the 3rd embodiment extremely comprises as side from the thing side:
One is crescent and the 3rd lens 30 of the negative refracting power of tool, its material is a glass, the 3rd lens 30 have a front surface 31 and a rear surface 32, and the 3rd lens 30 front surfaces 31 are concave surface, the 3rd lens 30 rear surfaces 32 are convex surface, and the front surface 31 of the 3rd lens 30 all is made as aspheric surface with rear surface 32 in addition;
The 4th lens 40 of the negative refracting power of one tool, its material is plastics, the 4th lens 40 have a front surface 41 and a rear surface 42, and the 4th lens 40 front surfaces 41 are convex surface, the 4th lens 40 rear surfaces 42 are concave surface, the front surface 41 of the 4th lens 40 all is made as aspheric surface with rear surface 42 in addition, and all is provided with the point of inflexion;
One aperture 50, be positioned at first lens 10 before;
One infrared filter (IR Filter) 60 places after the 4th lens 40, and it does not influence the focal length of system;
One imaging surface 70 places after the infrared filter 60.
The 3rd embodiment four-piece type imaging is with in the optical frames group, the focal length of first lens is f1, the focal length of second lens is f2, the focal length of the 3rd lens is f3, the focal length of the 4th lens is f4, the synthetic focal length of first lens and second lens is f12, and whole four-piece type imaging is f with the focal length of optical frames group, and its pass is:
f＝3.37mm；
f/f1＝1.70；
f/f2＝-0.93；
f/f3＝-0.10；
f/f4＝-0.10；
f/f12＝1.03。
The 3rd embodiment four-piece type imaging is with in the optical frames group, and the abbe number of first lens (AbbeNumber) is V1, and the abbe number of second lens is V2, and the abbe number of the 4th lens is V4, and its pass is:
V2＝30.2；
V4＝55.8；
[(V1+V4)/2]-V2＝33.2。
The 3rd embodiment four-piece type imaging is with in the optical frames group, and the front surface radius-of-curvature of first lens is R1, and whole four-piece type imaging is f with the focal length of optical frames group, and its pass is: R1/f=0.46.
The 3rd embodiment four-piece type imaging is with in the optical frames group, and the rear surface radius-of-curvature of second lens is R4, and whole four-piece type imaging is f with the focal length of optical frames group, and its pass is: R4/f=0.70.
The 3rd embodiment four-piece type imaging is with in the optical frames group, and the center thickness of second lens is CT2=0.350mm.
The 3rd embodiment four-piece type imaging is with in the optical frames group, the mirror angle ANG42=-29.5deg. of effective diameter position, the 4th lens rear surface, the direction of its mirror angle be defined as " when peripheral effective diameter angle to tiltedly just then being defined as inclination, tiltedly then being defined as negative to the thing inclination when peripheral effective diameter angle ".
The 3rd embodiment four-piece type imaging is with in the optical frames group, the chief ray that imaging is highly corresponding, the angle CRA of its incident electron photosensory assembly (Chief Ray Angle), half of maximum field of view angle is HFOV, its pass is: tan (CRA)/tan (HFOV)=0.79.
The 3rd embodiment four-piece type imaging is with in the optical frames group, and the mirror spacing of first lens and second lens is T12, and whole four-piece type imaging is f with the focal length of optical frames group, and its pass is: T12/f=0.022.
The 3rd embodiment four-piece type imaging is TTL with the optics length overall of optical frames group, and the four-piece type imaging highly is ImgH with the imaging of optical frames group, and its pass is: TTL/ImgH=1.86.
The detailed structured data of the 3rd embodiment is as shown in the table 5, and its aspherical surface data is as shown in the table 6, and wherein, the unit of radius-of-curvature, thickness and focal length is mm, and HFOV is defined as half of maximum visual angle.
Table 5
| (the 3rd embodiment) | |||||||
| F (focal length=3.37mm, Fno=2.8, HFOV (half angle of view)=33.0deg. | |||||||
| The Surface surface | Curvature Radius radius-of-curvature | Thickness thickness | The Material material | The Index refractive index | Abbe Ah ratio coefficient | Focal length focal length | |
| ?0 | The Object object | The Plano plane | Infinity is unlimited | ||||
| ?1 | The Ape.Stop aperture | The Plano plane | 0.06 | ||||
| ?2 | Lens 1 first lens | 1.54798(ASP) | 0.618 | Glass glass | 1.550 | 71.0 | 1.99 |
| ?3 | -3.19510(ASP) | 0.073 | |||||
| ?4 | Lens 2 second lens | -24.58110 (ASP) | 0.350 | The Plastic plastics | 1.583 | 30.2 | -3.66 |
| 5 | 2.34904(ASP) | 0.497 | |||||
| 6 | Lens 3 the 3rd lens | -1.40908(ASP) | 0.445 | Glass glass | 1.623 | 58.1 | -33.65 |
| 7 | -1.69373(ASP) | 0.050 | |||||
| 8 | Lens4 the 4th lens | 2.30741(ASP) | 1.050 | The Plastic plastics | 1.530 | 55.8 | -33.59 |
| 9 | 1.72069(ASP) | 0.300 | |||||
| 10 | The IR-filter infrared filter | The Plano plane | 0.300 | Glass glass | 1.517 | 64.1 | |
| 11 | The Plano plane | 0.410 | |||||
| 12 | Image imaging surface image | The Plano plane |
Table 6
| Aspheric Coefficient asphericity coefficient | ||||
| The Surface surface | 2 | 3 | 4 | 5 |
| K＝ A4＝ A6＝ A8＝ A10＝ | -9.73069E-01 -3.94075E-02 -1.15948E-01 -1.66846E-01 -9.39930E-02 | 0.00000E+00 -2.23415E-01 -1.11778E-01 4.54686E-01 -4.49351E-01 | 0.00000E+00 -9.85161E-02 -1.56380E-01 1.19232E+00 -8.27766E-01 | -1.06503E+00 1.26252E-01 -1.69069E-01 4.77795E-01 0.00000E+00 |
| The Surface surface | 6 | 7 | 8 | 9 |
| K＝ A4＝ A6＝ | -1.00545E+01 -1.35799E-01 -1.80601E-01 | -3.30666E+00 -1.55650E-01 1.31428E-01 | -2.79846E+01 -1.94772E-01 1.23192E-01 | -7.47737E+00 -7.23080E-02 1.63746E-02 |
| A8＝ A10＝ A12＝ A14＝ A16＝ | 8.16421E-02 3.19518E-01 -1.42044E+00 1.61603E+00 -6.89759E-01 | -8.83077E-02 3.29192E-03 4.71554E-02 2.00860E-02 -3.71448E-02 | -3.03850E-02 1.42617E-03 2.88469E-05 6.96749E-04 -3.45406E-04 | -2.25762E-03 -2.02787E-04 -2.24645E-04 1.49279E-04 -2.07466E-05 |
State clearly at this in advance; table 1 to table 6 is depicted as the different numerical value change tables of four-piece type imaging with optical frames group embodiment; the numerical value change of right each embodiment of the present invention is all true tests gained, even use different numerical value, the product of same structure must belong to protection scope of the present invention.Table 7 is the numerical data of the corresponding correlate equation of the present invention of each embodiment.
Table 7
| First embodiment | Second embodiment | The 3rd embodiment | |
| f Fno HFOV V2 V4 (V1+V4)/2-V2 f/f1 f/f2 f/f3 f/f4 f/f12 | 3.56 2.80 31.6 23.4 55.8 32.8 1.50 -0.64 -0.003 -0.39 1.07 | 3.48 3.20 32.1 30.2 55.8 26.0 1.80 -1.12 -0.10 -0.10 0.98 | 3.37 2.80 33.0 30.2 55.8 33.2 1.70 -0.93 -0.10 -0.10 1.03 |
| R1/f R4/f CT2 T12/f ANG42 tan(CRA)/ tan(HFOV) TTL/ImgH | 0.32 0.69 0.350 0.020 -34.7 0.82 1.75 | 0.39 0.96 0.424 0.020 -37.8 0.80 1.86 | 0.46 0.70 0.350 0.022 -29.5 0.79 1.86 |
In sum, the present invention is a kind of four-piece type imaging optical frames group, and mirror group volume can be effectively dwindled in lens arrangement, arrangement mode and eyeglass configuration by this, more can obtain higher resolving power simultaneously.
Claims (17)
1. a four-piece type imaging optical frames group is characterized in that, comprises the lens of four tool refracting powers, is extremely set gradually as side by the thing side:
First lens of the positive refracting power of one tool, its front surface are convex surface;
Second lens of the negative refracting power of one tool, its rear surface is a concave surface, and setting is an aspheric surface at least simultaneously on its eyeglass;
One is crescent and the 3rd lens of the negative refracting power of tool, and its rear surface is a convex surface;
The 4th lens of the negative refracting power of one tool, its front surface is a convex surface, and the rear surface is an aspheric surface;
One aperture is positioned at before first lens;
The chief ray that imaging is highly corresponding, the angle CRA of its incident electron photosensory assembly (Chief Ray Angle), half of maximum field of view angle is HFOV, its pass is: 0.5＜tan (CRA)/tan (HFOV)＜1.05.
2. four-piece type imaging optical frames group as claimed in claim 1 is characterized in that, abbe number V2＜32 of described second lens.
3. four-piece type imaging optical frames group as claimed in claim 2 is characterized in that the material of described second lens is plastics, and the forward and backward surface of second lens is all aspheric surface.
4. four-piece type imaging optical frames group as claimed in claim 3 is characterized in that, the forward and backward surface of described first lens is all aspheric surface.
5. four-piece type imaging optical frames group as claimed in claim 4 is characterized in that the material of described first lens is plastics.
6. four-piece type imaging optical frames group as claimed in claim 1 is characterized in that the material of described the 3rd lens is plastics, its forward and backward surface is all aspheric surface, the material of described the 4th lens is plastics, and its forward and backward surface is all aspheric surface, and the 4th lens are provided with the point of inflexion; And the mirror spacing of these first lens and second lens is T12, and whole four-piece type imaging is f with the focal length of optical frames group, and both satisfy following relational expression: T12/f＞0.015.
7. four-piece type imaging optical frames group as claimed in claim 4 is characterized in that the abbe number of described first lens is V1, the abbe number of second lens is V2, the abbe number of the 4th lens is V4, and its pass is: [(V1+V4)/2]-V2＞15, and V4＞45.
8. four-piece type imaging optical frames group as claimed in claim 1, it is characterized in that, this four-piece type imaging is established a sense electronics optical assembly for the object imaging in addition with the optical frames group, and the four-piece type imaging is TTL with the optics length overall of optical frames group, the four-piece type imaging highly is ImgH with the imaging of optical frames group, and both satisfy following relational expression: TTL/ImgH＜2.2.
9. four-piece type imaging optical frames group as claimed in claim 6 is characterized in that the mirror angle of the effective diameter position of the 4th lens rear surface is ANG42, satisfy following relational expression: ANG42＜-28deg..
10. four-piece type imaging optical frames group as claimed in claim 1 is characterized in that the focal length of these first lens is f1, and whole four-piece type imaging is f with the focal length of optical frames group, and both satisfy following relational expression: 1.2＜f/f1＜2.0.
11. four-piece type imaging optical frames group as claimed in claim 10 is characterized in that the focal length of the 3rd lens is f3, whole four-piece type imaging is f with the focal length of optical frames group, and both satisfy following relational expression :-0.5＜f/f3＜0; The focal length of the 4th lens is f4, and whole four-piece type imaging is f with the focal length of optical frames group, and both satisfy following relational expression :-0.5＜f/f4＜0.
12. four-piece type imaging optical frames group as claimed in claim 11, it is characterized in that, the focal length of these first lens is f1, the focal length of these second lens is f2, the focal length of the 3rd lens is f3, the focal length of the 4th lens is f4, and whole four-piece type imaging is f with the focal length of optical frames group, satisfies following relational expression: 1.4＜f/f1＜1.7;-0.8＜f/f2＜-0.5;-0.2＜f/f3＜0;-0.5＜f/f4＜0.
13. four-piece type imaging optical frames group as claimed in claim 11 is characterized in that the front surface radius-of-curvature of first lens is R1, whole four-piece type imaging is f with the focal length of optical frames group, and its pass is: 0.2＜R1/f＜0.6; The back radius-of-curvature of second lens is R4, and whole four-piece type imaging is f with the focal length of optical frames group, and its pass is: 0.5＜R4/f＜1.2.
14. four-piece type imaging optical frames group as claimed in claim 1 is characterized in that the synthetic focal length of first lens and second lens is f12, whole four-piece type imaging is f with the focal length of optical frames group, and its pass is: 0.8＜f/f12＜1.2.
15. four-piece type imaging optical frames group as claimed in claim 14 is characterized in that the center thickness of second lens is CT2, satisfies following relationship: 0.25mm＜CT2＜0.7mm.
16. four-piece type imaging optical frames group as claimed in claim 15 is characterized in that the abbe number of second lens is V2＜29.
17. four-piece type imaging optical frames group as claimed in claim 1 is characterized in that, the described first lens rear surface is a concave surface, and the described second lens front surface is a convex surface.
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| CN102081220B (en) * | 2009-11-26 | 2012-09-05 | 大立光电股份有限公司 | Optical lens group for capturing image |
| CN102253470B (en) * | 2010-05-18 | 2013-03-27 | 大立光电股份有限公司 | Photographing optical lens |
| TWI436126B (en) * | 2011-05-17 | 2014-05-01 | Largan Precision Co Ltd | Image capturing optical lens assembly |
| KR101964297B1 (en) | 2012-02-16 | 2019-04-01 | 엘지이노텍 주식회사 | Imaging lens |
| WO2019007065A1 (en) * | 2017-07-05 | 2019-01-10 | 浙江舜宇光学有限公司 | Optical imaging lens |
| CN110161650B (en) * | 2018-02-14 | 2021-07-20 | 新巨科技股份有限公司 | Four-piece infrared single-wavelength lens group |
| CN111045190A (en) * | 2018-10-11 | 2020-04-21 | 南昌欧菲精密光学制品有限公司 | Optical camera lens assembly, image capturing module and electronic device |
| CN113741003B (en) * | 2021-08-13 | 2023-02-17 | 江西晶超光学有限公司 | Optical system, lens module and electronic equipment |
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| CN1873461A (en) * | 2005-05-30 | 2006-12-06 | 大立光电股份有限公司 | Camera lens group in four pieces type |
| CN1979245A (en) * | 2005-12-01 | 2007-06-13 | 大立光电股份有限公司 | Four-piece type camera-lens group |
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| CN1873461A (en) * | 2005-05-30 | 2006-12-06 | 大立光电股份有限公司 | Camera lens group in four pieces type |
| CN1979245A (en) * | 2005-12-01 | 2007-06-13 | 大立光电股份有限公司 | Four-piece type camera-lens group |
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