CN209746251U - Small-head type large-field-angle glass-plastic hybrid lens - Google Patents
Small-head type large-field-angle glass-plastic hybrid lens Download PDFInfo
- Publication number
- CN209746251U CN209746251U CN201920842391.XU CN201920842391U CN209746251U CN 209746251 U CN209746251 U CN 209746251U CN 201920842391 U CN201920842391 U CN 201920842391U CN 209746251 U CN209746251 U CN 209746251U
- Authority
- CN
- China
- Prior art keywords
- lens
- optical axis
- field
- small
- refractive power
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Lenses (AREA)
Abstract
The utility model relates to a hybrid lens is moulded to big angle of vision glass of little head formula, its technical essential is, contains according to the preface by thing side to image side along the optical axis: a diaphragm; a first lens G1 with positive refractive power and convex object side surface; a second lens element P2 having negative refractive power and a concave object-side surface at the optical axis; a third lens element P3 having a positive refractive power and both object-side and image-side surfaces being concave at the optical axis; a fourth lens element P4 having positive refractive power and having a convex object-side surface at the optical axis; a fifth lens element P5 having positive refractive power and having a convex object-side surface at the optical axis; and a sixth lens element P6 having a negative refractive power, being M-shaped and having a concave image-side surface at the optical axis. The problems that the performance of a small-head lens is unstable and the assembly yield is low are solved, the field angle FOV is larger than or equal to 80 degrees, the long focal length, the high pixel and the small head outer diameter are achieved, the configuration of a high-occupied screen of a mobile phone is met, the most sensitive first lens is made of glass and is spherical, and the assembly yield and the assembly stability are remarkably improved.
Description
Technical Field
The utility model relates to an optical lens, especially a mixed camera lens is moulded to big angle of vision glass of little head formula adopts glass and plastic material lens combination, and stability is good under the service environment of difference, is applicable to comprehensive screen cell-phone.
Background
With the requirement of taking pictures by a smart phone being higher and higher, the screen occupation ratio is larger, the outer diameter and the size of the lens head are required to be smaller and smaller, however, the smaller the outer diameter of the lens head is, the higher the sensitivity of the lens is, the unstable performance of the lens is caused, and the assembly yield is low.
disclosure of Invention
the utility model aims at providing a solve little first camera lens unstable performance, the big angle of vision glass of little first formula of the problem that the equipment yield is low moulds hybrid lens, angle of vision FOV is greater than or equal to 80, long focus, high pixel, head external diameter are little, small, satisfy the configuration that the cell-phone highly accounts for the screen, and the most sensitive first lens adopts the glass material and just is the sphere, is showing the yield and the stability that improve the equipment.
The utility model provides a mixed camera lens is moulded to big angle of vision glass of little head formula, its technical essential is, contains in proper order along the optical axis from the thing side to image side:
a diaphragm;
A first lens G1 with positive refractive power and convex object side surface;
a second lens element P2 having negative refractive power and a concave object-side surface at the optical axis;
A third lens element P3 having a positive refractive power and both object-side and image-side surfaces being concave at the optical axis;
a fourth lens element P4 having positive refractive power and having a convex object-side surface at the optical axis;
A fifth lens element P5 having positive refractive power and having a convex object-side surface at the optical axis;
a sixth lens element P6 having a negative refractive power, an M-shaped configuration, and a concave image-side surface along the optical axis;
the first lens G1 is a high-refractive-index glass lens with the refractive index N1 larger than 1.7, the other five lenses are aspheric plastic lenses, the refractive index of the second lens P2 is larger than or equal to 1.67, the half apertures of the first lens G1 and the second lens P2 are smaller than 0.84mm, the field angle FOV of the lens is larger than or equal to 80 degrees, and the optical back focus BFL is larger than or equal to 0.78 mm.
The small-head type large-field-angle glass-plastic hybrid lens further meets the following conditional expression:
ct1/ttl>0.2
ct1+ct2+sag2≥1.37mm
ct1≥1mm
in the formula, ct1 is the thickness of the first lens element G1 on the optical axis, ttl is the total optical length of the lens, ct2 is the thickness of the second lens element P2 on the optical axis, and sag2 is the rise of the image-side edge of the second lens element. The first lens and the second lens are constrained by the conditional expression, and the length of the lens head is required to be more than 0.5mm so as to be suitable for the mobile phone with the extremely narrow frame. In order to satisfy the smaller space outside the screen of the mobile phone, the central thickness ct1 of the first lens G1 is required to be more than or equal to 1mm so as to satisfy the requirement of smaller head.
The small-head type large-field-angle glass-plastic hybrid lens further meets the following conditional expression:
R1≥2.2mm
0.07≤R1/R2≤0.096
In the formula: r1 and R2 are radii of curvature of the object-side surface and the image-side surface of the first lens G1, respectively. R1 is more than or equal to 2.2mm, the minimum value of the processed curvature radius is ensured, and when the R1 value is less than 2.2mm, the manufacturing eccentricity is large; the sensitivity of the first lens is high, and the conditional expression of 0.07< R1/R2<0.096 limits the curvature radius of the spherical surface, which is beneficial to reducing tolerance and assembly sensitivity. Meanwhile, the shape of the first lens is reasonably controlled, and the requirement of a large field angle is met, so that the spherical aberration and astigmatism of the optical system can be effectively reduced by the first lens.
The small-head type large-field-angle glass-plastic hybrid lens further meets the following conditional expression:
0.86≤f1/f≤0.882
In the formula: f is the effective focal length of the lens, and f1 is the focal length of the first lens G1. Satisfying the above formula is beneficial to the development of the lens towards ultra-thinness, makes the refractive power of the first lens G1 big, is beneficial to the development of the lens towards wide-angle.
The small-head type large-field-angle glass-plastic hybrid lens further meets the following conditional expression:
-1.262≤f2/f≤-1.196
In the formula: f is the effective focal length of the lens, and f2 is the effective focal length of the second lens P2. The above equation controls the power of the second lens P2 to reasonably and effectively balance the spherical aberration generated by the first lens G1 having positive power and the amount of curvature of field of the system; meanwhile, the length of the lens is favorably shortened, and the aberration of the first lens is reduced.
The small-head type large-field-angle glass-plastic hybrid lens further meets the following conditional expression:
-0.151≤f2/f3≤-0.071
2.816≤f4/f5≤3.52
in the formula: f2 is the effective focal length of the second lens P2, f3 is the effective focal length of the third lens P3, f4 is the effective focal length of the fourth lens P4, and f5 is the effective focal length of the fifth lens P. The ratio of the effective focal lengths of the second lens and the third lens, which meets the above formula limitation, can reasonably distribute the focal powers of the second lens and the third lens, and meet the requirements of small size, lightness and thinness and large field angle of the lens head; the effective focal length ratio of the fourth lens and the fifth lens which meet the limitation of the above formula can reduce the field curvature of the edge field of view, shorten the distance of the rear end of the lens, and facilitate the assembly and the ultra-thinning.
The small-head type large-field-angle glass-plastic hybrid lens further meets the following conditional expression:
ct2/ct3≥0.928
in the formula: ct2 is the thickness of the second lens P2 at the optical axis, and ct3 is the thickness of the third lens P3 at the optical axis. The requirement for the above formula is favorable for the length of the front end structure of the lens to adapt to the ultrathin characteristic of the mobile phone.
The small-head type large-field-angle glass-plastic hybrid lens further meets the following conditional expression:
0.563≤et4/et5≤0.693
In the formula: et4 is the horizontal distance from the edge of the fourth lens P4 to the edge of the fifth lens P5, and et5 is the horizontal distance from the edge of the fifth lens to the edge of the sixth lens. The above formula limits the position of the fifth lens P5, and exceeding this range does not satisfy the dimensional requirements of the assembled parts between the lenses, resulting in large manufacturing and assembling tolerances and low yield.
The small-head type large-field-angle glass-plastic hybrid lens further meets the following conditional expression:
0.603≤(R61+R62)/(R61-R62)≤0.641
in the formula: r61 and R62 are radii of curvature of the object-side and image-side surfaces of the sixth lens, respectively. The optical aberration correction method meets the above formula, is favorable for correcting the aberration of the optical system, reduces the field curvature of the edge field, and improves the resolving power.
In the small-head type large-field-angle glass-plastic hybrid lens, the second lens P2, the third lens P3, the fourth lens P4, the fifth lens P5 and the sixth lens P6 all adopt even-order aspheric plastic lenses, and aspheric coefficients satisfy the following equation:
Z＝cy/[1+{1－(1+k)cy}]+Ay+Ay+Ay+Ay+Ay+Ay+Ay
In the formula, Z is an aspheric sagittal height, c is an aspheric paraxial curvature, y is a lens aperture, k is a conic coefficient, a4 is a 4-order aspheric coefficient, a6 is a 6-order aspheric coefficient, A8 is an 8-order aspheric coefficient, a10 is a 10-order aspheric coefficient, a12 is a 12-order aspheric coefficient, a14 is a 14-order aspheric coefficient, and a16 is a 16-order aspheric coefficient.
the utility model has the advantages that:
the optical system is formed by mixing one glass lens and five plastic lenses, and the two surfaces of the first lens G1 are spherical surfaces, and the object side surface is a convex spherical surface, so that the sensitivity is lower than that of an aspheric surface, the optical system is suitable for the condition that the outer diameter of the head of the lens is small, the assembly stability of the small-head lens is improved, and the assembly yield is improved. The six lenses with different positive and negative refractive powers are combined to achieve the purposes of large field angle, long focal length and high resolving power.
Drawings
Fig. 1 is a schematic structural diagram of the present invention (corresponding to embodiment 1);
Fig. 2 is a defocus graph (corresponding to example 1) of the lens of the present invention, in which the abscissa is the defocus position and the ordinate is the modulation range;
Fig. 3 is a vertical axis chromatism chart of the lens of the present invention (corresponding to embodiment 1), in which the abscissa is the vertical axis chromatism value and the ordinate is the normalized viewing field;
Fig. 4 shows astigmatic field curvature of the lens according to the present invention (corresponding to example 1), where the abscissa is the field curvature value and the ordinate is the field angle;
Fig. 5 is an optical distortion curve (corresponding to example 1) of the lens of the present invention, where the abscissa is distortion value and the ordinate is field height;
fig. 6 is a schematic structural view of the present invention (corresponding to embodiment 2);
Fig. 7 is a defocus graph of the lens of the present invention (corresponding to embodiment 2);
fig. 8 is a vertical axis chromatic aberration diagram of the lens of the present invention (corresponding to embodiment 2);
Fig. 9 shows astigmatic field curvature of the lens according to the present invention (corresponding to example 2);
fig. 10 shows an optical distortion curve of the lens barrel according to the present invention (corresponding to embodiment 2);
Fig. 11 is a schematic structural view of the present invention (corresponding to example 3);
Fig. 12 is a defocus graph of the lens of the present invention (corresponding to embodiment 3);
Fig. 13 is a vertical axis chromatic aberration diagram of the lens of the present invention (corresponding to embodiment 3);
Fig. 14 shows astigmatic field curvature of the lens according to the present invention (corresponding to example 3);
Fig. 15 shows an optical distortion curve of the lens system according to the present invention (corresponding to embodiment 3).
In the figure: 2. the lens system comprises a first lens G1 object side, 3, a first lens G1 image side, 4, a second lens P2 object side, 5, a second lens P2 image side, 6, a third lens P3 object side, 7, a third lens P3 image side, 8, a fourth lens P4 object side, 9, a fourth lens P4 image side, 10, a fifth lens P5 object side, 11, a fifth lens P5 image side, 12, a sixth lens P6 object side, 13, and a sixth lens P6 image side.
Detailed Description
Example 1
as shown in fig. 1, the small-head large-field-angle glass-plastic hybrid lens, in order from an object side to an image side along an optical axis, comprises: a diaphragm; a first lens G1 with positive refractive power and convex object side surface; a second lens element P2 having negative refractive power and a concave object-side surface at the optical axis; a third lens element P3 having a positive refractive power and both object-side and image-side surfaces being concave at the optical axis; a fourth lens element P4 having positive refractive power and having a convex object-side surface at the optical axis; a fifth lens element P5 having positive refractive power and having a convex object-side surface at the optical axis; and a sixth lens element P6 having a negative refractive power, being M-shaped and having a concave image-side surface at the optical axis. The first lens G1 is a high-refractive-index glass lens with the refractive index N1 being more than 1.7, the other five lenses are aspheric plastic lenses, and the refractive index of the second lens P2 is larger than or equal to 1.67.
this hybrid lens is moulded to big angle of vision glass of little head formula still satisfies the following conditional expression:
ct1/ttl>0.2
ct1+ct2+sag2≥1.37mm
ct1≥1mm
0.86≤f1/f≤0.882
R1≥2.2mm
0.07≤R1/R2≤0.096
-1.262≤f2/f≤-1.196
-0.151≤f2/f3≤-0.071
ct2/ct3≥0.928
0.563≤et4/et5≤0.693
2.816≤f4/f5≤3.52
0.603≤(R61+R62)/(R61-R62)≤0.641
Wherein ct1 is the thickness of the first lens G1 on the optical axis, ttl is the total optical length of the lens barrel, ct2 is the thickness of the second lens P2 on the optical axis, sag2 is the rise of the image side edge of the second lens, f is the effective focal length of the lens barrel, f1 is the effective focal length of the first lens G1, f2 is the effective focal length of the second lens P2, f3 is the effective focal length of the third lens P3, f4 is the effective focal length of the fourth lens P4, f5 is the effective focal length of the fifth lens, R1 and R2 are the radii of curvature of the object side and the image side of the first lens G1, ct3 is the thickness of the third lens on the optical axis, et4 is the horizontal distance from the edge of the fourth lens to the edge of the fifth lens, et5 is the horizontal distance from the edge of the fifth lens to the edge of the sixth lens, and R61 and R62 are the radii of curvature of the object side and the image side of the sixth lens.
according to the small-head type large-field-angle glass-plastic hybrid lens, the second lens P2, the third lens P3, the fourth lens P4, the fifth lens P5 and the sixth lens P6 are all even-order aspheric plastic lenses, and aspheric coefficients meet the following equation:
Z＝cy/[1+{1－(1+k)cy}]+Ay+Ay+Ay+Ay+Ay+Ay+Ay
In the formula, Z is an aspheric sagittal height, c is an aspheric paraxial curvature, y is a lens aperture, k is a conic coefficient, a4 is a 4-order aspheric coefficient, a6 is a 6-order aspheric coefficient, A8 is an 8-order aspheric coefficient, a10 is a 10-order aspheric coefficient, a12 is a 12-order aspheric coefficient, a14 is a 14-order aspheric coefficient, and a16 is a 16-order aspheric coefficient.
In this embodiment, specific design parameters of the lens are shown in tables 1 and 2:
TABLE 1
TABLE 2
| Flour mark | k | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| 4 | -13.5134 | -0.0308 | 0.098558 | -0.27945 | 0.260944 | -1.39481 | 8.841016 | -22.58330 |
| 5 | 10.52421 | -0.1284 | 0.315075 | -2.35852 | 11.27699 | -36.4623 | 73.41824 | -89.50549 |
| 6 | 16.64148 | -0.11006 | -0.02153 | -0.07051 | -0.53055 | 3.188462 | -7.37389 | 6.28813 |
| 7 | -89.1631 | -0.09723 | 0.534783 | -2.34618 | 5.886234 | -9.05285 | 9.557758 | -7.19914 |
| 8 | 0.233456 | -0.2375 | 0.64092 | -1.04035 | -0.98109 | 7.72162 | -13.3902 | 10.98341 |
| 9 | -7.79553 | -0.24736 | 0.1419 | 0.030247 | -0.25643 | 0.03743 | 0.662883 | -0.94210 |
| 10 | -8.72938 | -0.08173 | -0.05437 | 0.091567 | -0.04325 | -0.06663 | 0.098244 | -0.05666 |
| 11 | -0.89419 | 0.070156 | -0.20516 | 0.36206 | -0.34389 | 0.192938 | -0.06603 | 0.01354 |
| 12 | 4.578763 | -0.40203 | 0.346065 | -0.15834 | 0.049605 | -0.01096 | 0.001629 | -0.00015 |
| 13 | -13.686 | -0.18942 | 0.149387 | -0.07875 | 0.02777 | -0.00658 | 0.001006 | -0.00009 |
In this embodiment, the field angle FOV of the lens is 80.4 °, the half apertures of the first lens G1 and the second lens P2 are 0.835mm and 0.887mm, respectively, and the optical back focal length BFL is 0.78 mm.
ct1/ttl＝0.2083；
Ct1+ct2+sag2＝1.374mm；
ct1＝1mm；
R1＝2.2mm；
R1/R2＝0.0798；
f1/f＝0.877；
f2/f＝-1.196；
f2/f3＝-0.151；
ct2/ct3＝0.928；
et4/et5＝0.693；
f4/f5＝3.52；
(R61+R62)/(R61-R62)＝0.603。
Referring to fig. 1, each lens of the lens is symmetrical in shape, so that the lens is convenient to mold and produce, and the distance between lenses is reasonable, so that the structural design at the later stage is convenient.
Referring to fig. 2, a defocus graph of the lens represents a slight distance from a focal point of each field of view to an image plane, different curves represent different fields of view, a solid line is a meridian direction, and a dashed line is a sagittal direction. The vertex of each curve represents the MTF value of the field of view, and the higher the value of the vertical axis corresponding to the vertex is and the closer to the center is, the better the imaging is, and as can be seen from the figure, the imaging effect of the lens of the embodiment is good.
Referring to fig. 3, a vertical axis chromatic aberration diagram of the lens shows vertical axis chromatic aberration of an imaging system of the lens, the vertical axis chromatic aberration shows a difference of focal positions of wavelengths of each color on the whole image plane of the system, the smaller the vertical axis chromatic aberration is, the better the light of the wavelengths of each color is converged, and the convergence effect of the light of the wavelengths of each color of the lens is good in view of the diagram.
referring to fig. 4, the astigmatic field curvature of the lens shown in this embodiment, different curves represent different wavelengths, S represents sagittal field curvature, and T represents meridional field curvature, where the difference between the two curves is astigmatism of the system, and the astigmatism and the field curvature are important aberrations affecting rays of the off-axis field of view, and the astigmatism affects the imaging quality of the off-axis field of view.
Referring to fig. 5, the optical distortion curve of the lens is shown, the distortion does not affect the definition of an image, but causes system deformation, the distortion of the system is less than 2%, and the imaging quality is good.
example 2
The lens composition of this embodiment is the same as that of embodiment 1, and the specific design parameters are shown in tables 3 and 4:
TABLE 2
| flour mark | surface type | Radius of curvature | thickness of | Abbe number of material | coefficient of cone |
| object | 370 | ||||
| stop | Spherical surface | infinite number of elements | -0.14729 | ||
| 2 | Spherical surface | 2.2 | 1 | LAF3_HOYA | 0 |
| 3 | Spherical surface | 22.91232 | 0.057791 | 0 | |
| 4 | aspherical surface | -27.1358 | 0.26 | 670000.195 | -13.5134 |
| 5 | Aspherical surface | 3.660093 | 0.114289 | 11.0669 | |
| 6 | Aspherical surface | 5.831842 | 0.28 | 661200.2035 | 16.64214 |
| 7 | aspherical surface | 6.811011 | 0.05 | -89.1631 | |
| 8 | Aspherical surface | 15.16148 | 0.499636 | 544500.5599 | 0.233456 |
| 9 | aspherical surface | -10.4073 | 0.360705 | -7.79553 | |
| 10 | Aspherical surface | 4.298748 | 0.386069 | 544500.5599 | -8.72938 |
| 11 | Aspherical surface | -4.00574 | 0.548863 | -0.89564 | |
| 12 | Aspherical surface | -6.92311 | 0.381278 | 535200.5612 | 4.574866 |
| 13 | Aspherical surface | 1.688672 | 0.450002 | -13.686 | |
| 14 | Spherical surface | Infinite number of elements | 0.21 | BK7_SCHOTT | |
| 15 | spherical surface | infinite number of elements | 0.210368 | ||
| IMA | Spherical surface | Infinite number of elements | 0 |
TABLE 4
In the present embodiment, the lens field angle FOV is 80.4 °, the half apertures of the first lens G1 and the second lens P2 are 0.835mm and 0.8873mm, respectively, and the optical back focus BFL is 0.78 mm.
ct1/ttl＝0.2083；
Ct1+ct2+sag2＝1.37mm；
f1/f＝0.882；
R1＝2.2mm；
R1/R2＝0.096；
N2＝1.67；
f2/f＝-1.262；
f2/f3＝-0.087；
ct2/ct3＝0.929；
et4/et5＝0.689；
f4/f5＝2.948；
(R61+R62)/(R61-R62)＝0.6078。
referring to fig. 6, the lens has symmetrical lens shapes, which is convenient for molding production, and has reasonable lens spacing, which is convenient for later structural design.
Referring to fig. 7, a defocus graph of the lens represents a slight distance from a focal point to an image plane of each field of view, different curves represent different fields of view, a solid line is a meridian direction, and a dashed line is a sagittal direction. The vertex of each curve represents the MTF value of the field of view, and the higher the value of the vertical axis corresponding to the vertex is and the closer to the center is, the better the imaging is, and as can be seen from the figure, the imaging effect of the lens of the embodiment is good.
Referring to fig. 8, a vertical axis chromatic aberration diagram of the lens shows vertical axis chromatic aberration of an imaging system of the lens, where the vertical axis chromatic aberration shows a difference of focal positions of wavelengths of each color on the whole image plane of the system, and the smaller the vertical axis chromatic aberration is, the better the light of the wavelengths of each color is converged, and the better the light convergence effect of the wavelengths of each color of the lens is seen from the diagram.
Referring to fig. 9, the astigmatic field curvature of the lens shown in this embodiment has different curves representing different wavelengths, S represents sagittal field curvature, and T represents meridional field curvature, where the difference between the two curves is astigmatism of the system, and the astigmatism and the field curvature are important aberrations affecting the rays of the off-axis field of view, and the astigmatism affects the imaging quality of the off-axis field of view.
Referring to fig. 10, the optical distortion curve of the lens is shown, the distortion does not affect the definition of an image, but causes system deformation, the distortion of the system is less than 2%, and the imaging quality is good.
example 3
The lens composition of the present embodiment is the same as that of embodiment 1, and the specific design parameters are shown in tables 5 and 6:
TABLE 5
| flour mark | surface type | Radius of curvature | Thickness of | Abbe number of material | Coefficient of cone |
| object | 370 | ||||
| stop | spherical surface | Infinite number of elements | -0.15426 | ||
| 2 | Spherical surface | 2.2 | 1 | NLAF3_SCHOTT | 0 |
| 3 | spherical surface | 31.41239 | 0.051913 | 0 | |
| 4 | Aspherical surface | -26.8899 | 0.26 | 670000.195 | -13.5134 |
| 5 | Aspherical surface | 3.584822 | 0.118373 | 11.48469 | |
| 6 | Aspherical surface | 6.272427 | 0.28 | 661200.2035 | 16.6401 |
| 7 | Aspherical surface | 7.190636 | 0.05 | -89.1631 | |
| 8 | Aspherical surface | 15.77353 | 0.517229 | 544500.5599 | 0.233456 |
| 9 | Aspherical surface | -9.69535 | 0.351225 | -7.79553 | |
| 10 | Aspherical surface | 4.460317 | 0.380996 | 544500.5599 | -8.72938 |
| 11 | aspherical surface | -4.017 | 0.546724 | -0.89648 | |
| 12 | Aspherical surface | -7.52466 | 0.381896 | 535200.5612 | 4.574744 |
| 13 | Aspherical surface | 1.647752 | 0.450002 | -13.686 | |
| 14 | Spherical surface | Infinite number of elements | 0.21 | BK7_SCHOTT | |
| 15 | spherical surface | infinite number of elements | 0.210641 | ||
| IMA | Spherical surface | Infinite number of elements | 0 |
TABLE 6
| Flour mark | k | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| 4 | -13.5134 | -0.03594 | 0.246556 | -1.74269 | 8.268242 | -28.4155 | 66.06196 | -96.4332 |
| 5 | 11.48469 | -0.12667 | 0.326116 | -2.28329 | 9.862107 | -30.5342 | 61.40123 | -76.9046 |
| 6 | 16.6401 | -0.10459 | -0.18795 | 1.592793 | -9.51325 | 32.28525 | -66.1376 | 78.17363 |
| 7 | -89.1631 | -0.10563 | 0.388848 | -1.40982 | 2.676104 | -2.11734 | 0.257302 | 0.262447 |
| 8 | 0.233456 | -0.21885 | 0.533207 | -0.66602 | -2.18002 | 11.06027 | -19.1955 | 16.57026 |
| 9 | -7.79553 | -0.23607 | 0.224542 | -0.51473 | 1.303954 | -2.58114 | 3.368668 | -2.62381 |
| 10 | -8.72938 | -0.1146 | 0.104935 | -0.38203 | 0.726648 | -0.87318 | 0.653151 | -0.29633 |
| 11 | -0.89648 | 0.036326 | -0.09006 | 0.1401 | -0.13446 | 0.083351 | -0.03223 | 0.00741 |
| 12 | 4.574744 | -0.43495 | 0.41787 | -0.24607 | 0.108339 | -0.03413 | 0.007197 | -0.00095 |
| 13 | -13.686 | -0.19551 | 0.155791 | -0.08245 | 0.028891 | -0.00677 | 0.001025 | -9E-05 |
In the present embodiment, the lens field angle FOV is 80 °, the half apertures of the first lens G1 and the second lens P2 are 0.83mm and 0.88mm, respectively, and the optical back focus BFL is 0.78 mm.
ct1/ttl＝0.2083；
ct1+ct2+sag2＝1.376mm；
f1/f＝0.86；
R1＝2.2mm；
R1/R2＝0.07；
N2＝1.67；
f2/f＝-1.237；
f2/f3＝-0.071；
ct2/ct3＝0.929；
et4/et5＝0.563；
f4/f5＝2.816；
(R61+R62)/(R61-R62)＝0.641。
Referring to fig. 11, the lens has symmetrical lens shapes, which is convenient for molding production, and the lens has reasonable spacing, which is convenient for the later structural design.
referring to fig. 12, a defocus graph of the lens represents a slight distance from a focal point to an image plane of each field of view, different curves represent different fields of view, a solid line is a meridional direction, and a dashed line is a sagittal direction. The vertex of each curve represents the MTF value of the field of view, and the higher the value of the vertical axis corresponding to the vertex is and the closer to the center is, the better the imaging is, and as can be seen from the figure, the imaging effect of the lens of the embodiment is good.
Referring to fig. 13, a vertical axis chromatic aberration diagram of the lens shows vertical axis chromatic aberration of an imaging system of the lens, where the vertical axis chromatic aberration shows a difference of focal positions of wavelengths of each color on the whole image plane of the system, and the smaller the vertical axis chromatic aberration, the better the light of the wavelengths of each color is converged, and the better the light convergence effect of the wavelengths of each color of the lens is seen from the diagram.
Referring to fig. 14, the astigmatic field curvature of the lens shown in this embodiment, different curves represent different wavelengths, S represents sagittal field curvature, and T represents meridional field curvature, where the difference between the two curves is astigmatism of the system, and the astigmatism and the field curvature are important aberrations affecting rays of the off-axis field of view, and the astigmatism affects the imaging quality of the off-axis field of view.
Referring to fig. 15, the optical distortion curve of the lens is shown, the distortion does not affect the definition of an image, but causes system deformation, the distortion of the system is less than 2%, and the imaging quality is good.
Claims (10)
1. A small-head large-field-angle glass-plastic hybrid lens, in order from an object side to an image side along an optical axis, comprises:
A diaphragm;
A first lens G1 with positive refractive power and convex object side surface;
A second lens element P2 having negative refractive power and a concave object-side surface at the optical axis;
A third lens element P3 having a positive refractive power and both object-side and image-side surfaces being concave at the optical axis;
A fourth lens element P4 having positive refractive power and having a convex object-side surface at the optical axis;
A fifth lens element P5 having positive refractive power and having a convex object-side surface at the optical axis;
A sixth lens element P6 having a negative refractive power, an M-shaped configuration, and a concave image-side surface along the optical axis;
The first lens G1 is a high-refractive-index glass lens with the refractive index N1 larger than 1.7, the other five lenses are aspheric plastic lenses, the refractive index of the second lens P2 is larger than or equal to 1.67, the half apertures of the first lens G1 and the second lens P2 are smaller than 0.84mm, the field angle FOV of the lens is larger than or equal to 80 degrees, and the optical back focus BFL is larger than or equal to 0.78 mm.
2. the small-head large-field-angle glass-plastic hybrid lens according to claim 1, further satisfying the following conditional expression:
ct1/ttl>0.2
ct1+ct2+sag2≥1.37mm
ct1≥1mm
In the formula, ct1 is the thickness of the first lens element G1 on the optical axis, ttl is the total optical length of the lens, ct2 is the thickness of the second lens element P2 on the optical axis, and sag2 is the rise of the image-side edge of the second lens element.
3. the small-head large-field-angle glass-plastic hybrid lens according to claim 1, further satisfying the following conditional expression:
R1≥2.2mm
0.07≤R1/R2≤0.096
in the formula: r1 and R2 are radii of curvature of the object-side surface and the image-side surface of the first lens G1, respectively.
4. the small-head large-field-angle glass-plastic hybrid lens according to claim 1, further satisfying the following conditional expression:
0.86≤f1/f≤0.882
in the formula: f is the effective focal length of the lens, and f1 is the focal length of the first lens G1.
5. The small-head large-field-angle glass-plastic hybrid lens according to claim 1, further satisfying the following conditional expression:
-1.262≤f2/f≤-1.196
in the formula: f is the effective focal length of the lens, and f2 is the effective focal length of the second lens P2.
6. The small-head large-field-angle glass-plastic hybrid lens according to claim 1, further satisfying the following conditional expression:
-0.151≤f2/f3≤-0.071
2.816≤f4/f5≤3.52
in the formula: f2 is the effective focal length of the second lens P2, f3 is the effective focal length of the third lens P3, f4 is the effective focal length of the fourth lens P4, and f5 is the effective focal length of the fifth lens P.
7. The small-head large-field-angle glass-plastic hybrid lens according to claim 1, further satisfying the following conditional expression:
ct2/ct3≥0.928
In the formula: ct2 is the thickness of the second lens P2 at the optical axis, and ct3 is the thickness of the third lens P3 at the optical axis.
8. the small-head large-field-angle glass-plastic hybrid lens according to claim 1, further satisfying the following conditional expression:
0.563≤et4/et5≤0.693
In the formula: et4 is the horizontal distance from the edge of the fourth lens P4 to the edge of the fifth lens P5, and et5 is the horizontal distance from the edge of the fifth lens to the edge of the sixth lens.
9. The small-head large-field-angle glass-plastic hybrid lens according to claim 1, further satisfying the following conditional expression:
0.603≤(R61+R62)/(R61-R62)≤0.641
in the formula: r61 and R62 are radii of curvature of the object-side and image-side surfaces of the sixth lens, respectively.
10. The small-head large-field-angle glass-plastic hybrid lens according to claim 1, wherein the second lens P2, the third lens P3, the fourth lens P4, the fifth lens P5 and the sixth lens P6 are all even-order aspheric plastic lenses, and aspheric coefficients satisfy the following equation:
Z＝cy/[1+{1－(1+k)cy}]+Ay+Ay+Ay+Ay+Ay+Ay+Ay
In the formula, Z is an aspheric sagittal height, c is an aspheric paraxial curvature, y is a lens aperture, k is a conic coefficient, a4 is a 4-order aspheric coefficient, a6 is a 6-order aspheric coefficient, A8 is an 8-order aspheric coefficient, a10 is a 10-order aspheric coefficient, a12 is a 12-order aspheric coefficient, a14 is a 14-order aspheric coefficient, and a16 is a 16-order aspheric coefficient.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920842391.XU CN209746251U (en) | 2019-06-05 | 2019-06-05 | Small-head type large-field-angle glass-plastic hybrid lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920842391.XU CN209746251U (en) | 2019-06-05 | 2019-06-05 | Small-head type large-field-angle glass-plastic hybrid lens |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209746251U true CN209746251U (en) | 2019-12-06 |
Family
ID=68723837
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920842391.XU Active CN209746251U (en) | 2019-06-05 | 2019-06-05 | Small-head type large-field-angle glass-plastic hybrid lens |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209746251U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11215798B2 (en) | 2019-09-06 | 2022-01-04 | Largan Precision Co., Ltd. | Photographing optical lens system, image capturing unit and electronic device |
| US12025800B2 (en) | 2020-02-27 | 2024-07-02 | Coretronic Corporation | Optical lens |
-
2019
- 2019-06-05 CN CN201920842391.XU patent/CN209746251U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11215798B2 (en) | 2019-09-06 | 2022-01-04 | Largan Precision Co., Ltd. | Photographing optical lens system, image capturing unit and electronic device |
| US12025800B2 (en) | 2020-02-27 | 2024-07-02 | Coretronic Corporation | Optical lens |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109581627B (en) | Image pickup optical lens | |
| CN109709660B (en) | Image pickup optical lens | |
| CN109445076B (en) | Image pickup optical lens | |
| CN111352211A (en) | Small-head high-resolution lens | |
| CN111722369A (en) | Ultra-wide angle lens | |
| CN115097602A (en) | Image pickup optical lens | |
| CN113433656A (en) | Imaging system, lens module and electronic equipment | |
| CN209746251U (en) | Small-head type large-field-angle glass-plastic hybrid lens | |
| CN109188675B (en) | Periscope type lens with long focal length biprism | |
| CN114815168A (en) | Optical imaging lens | |
| CN111352212A (en) | Large-view-field angle long-focus periscope lens | |
| CN209746255U (en) | Small-head type high-pixel glass-plastic hybrid lens | |
| CN113933962A (en) | Optical lens, camera module and electronic equipment | |
| CN111025539B (en) | Image pickup optical lens | |
| CN113156612A (en) | Optical system, image capturing module and electronic equipment | |
| CN111352213B (en) | Periscope type lens with high-pixel prism | |
| CN208172359U (en) | A kind of imaging lens system group | |
| CN208270839U (en) | A kind of microcephaly's large aperture micro lens | |
| CN217587742U (en) | Optical lens | |
| CN115097597B (en) | Glass-plastic mixed thermal drift stable fish-eye lens | |
| CN113960754B (en) | Optical imaging lens | |
| CN108627954A (en) | A kind of imaging lens system group | |
| CN214151204U (en) | Optical imaging lens with large image surface | |
| CN213365167U (en) | Eight wide-angle camera lenses | |
| CN213544944U (en) | Optical imaging lens |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20201207 Address after: 124000 No. 388 North China Road, Xinglongtai District, Panjin City, Liaoning Province Patentee after: Liaoning Zhonglan Photoelectric Technology Co.,Ltd. Address before: 124000 Xinglongtai District, Panjin, Liaoning Province, China Road East Patentee before: LIAONING ZHONGLAN ELECTRONIC TECHNOLOGY Co.,Ltd. |
|
| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: A small head type glass plastic hybrid lens with large field of view angle Effective date of registration: 20210726 Granted publication date: 20191206 Pledgee: China Construction Bank Corporation Panjin branch Pledgor: Liaoning Zhonglan Photoelectric Technology Co.,Ltd. Registration number: Y2021210000049 |